CN111376213A - electric hammer - Google Patents

Abstract

The invention discloses an electric hammer, comprising: a striking shaft, including a striking end for striking a nail, the striking shaft can reciprocate along a first axis; an impact mechanism is used for outputting an impact force to the striking shaft to drive the striking shaft to strike the nails ; Motor, used to drive the impact mechanism; Case, used to support the impact shaft, impact mechanism and motor; Impact mechanism includes: impact block, used for reciprocating impact impact shaft; Surface contact with the striker shaft to transmit the impact force to the striker shaft. The power of the electric hammer to hit the nail is enhanced, and the service life is prolonged.

Description

electric hammer

technical field

The present invention relates to electric tools, in particular to electric hammers.

Background technique

For nail-type electric tools used to drive nails into substrates, such as electric hammers, the realization of the reciprocating impact action of the electric hammer is usually to convert the rotating action of the motor into a reciprocating impact action through a conversion device. However, the traditional conversion device is easily worn out. Once worn, the electric hammer will work inefficiently or be damaged, and the striking force is not enough to meet the needs of users. Therefore, the traditional electric hammer has a short life and needs to be improved.

SUMMARY OF THE INVENTION

In order to solve the deficiencies of the prior art, the main purpose of the present invention is to provide an electric hammer which has enhanced impact force and a longer service life.

In order to achieve the above main purpose of the invention, an electric hammer is proposed. , used for the reciprocating movement of the impact shaft; the motor is used to drive the impact mechanism; the casing is used to support the strike shaft, the impact mechanism and the motor; wherein, the impact mechanism includes: an impact block, which is formed to be in contact with the strike shaft to strike The impact surface of the shaft outputting the impact force; the support shaft for supporting the impact block; wherein, the impact shaft is formed with a force bearing surface for contacting with the impact surface to receive the impact force output by the impact block; During impact, the ratio of the area of the force-bearing surface that is in contact with the impact surface to the area of the striking surface is greater than or equal to 0.5 and less than or equal to 20.

Optionally, the force-bearing surface is a plane.

Optionally, the striking shaft and the striking mechanism are rotatably connected, and the striking mechanism only applies impact force to the striking shaft without applying rotational force.

Optionally, the electric hammer further includes a buffer assembly disposed between the impact mechanism and the casing, the buffer assembly at least includes a buffer gasket and a rubber ring, and the buffer gasket is disposed between the rubber ring and the impact mechanism.

Optionally, the impact block has an accommodating groove, the support shaft is provided with a guide groove arranged opposite to the accommodating groove, and the electric hammer includes movable parts arranged in the accommodating groove and the guide groove, and the movable part slides in the guide groove to drive the impact block to perform a reciprocating impact motion. .

In order to achieve the above main purpose of the invention, an electric hammer is proposed, comprising: a striking shaft, including a striking end for striking a nail, the striking shaft can reciprocate along the first axis; an impact mechanism is used to output an impact force to the striking shaft to drive The striking shaft strikes the nails; the motor is used to drive the striking mechanism; the casing is used to support the striking shaft, the striking mechanism and the motor; wherein, the striking mechanism comprises: an impact block for the reciprocating striking striking shaft; the supporting shaft is used for supporting Impact block; wherein, the impact block is in surface contact with the striking shaft to transmit the impact force to the striking shaft.

Optionally, at least part of the striking shaft is made of a ferromagnetic material.

Optionally, the impact mechanism includes a nail-holding mechanism provided at the end of the casing, and the nail-holding mechanism includes a magnetic member for attracting fasteners.

Optionally, the striking shaft and the striking mechanism are rotatably connected, and the striking mechanism only applies impact force to the striking shaft without applying rotational force.

Optionally, the electric hammer further includes a buffer assembly disposed between the impact mechanism and the casing, the buffer assembly at least includes a buffer gasket and a rubber ring, and the buffer gasket is disposed between the rubber ring and the impact mechanism.

Optionally, the impact block and the support shaft are provided with oppositely arranged guide grooves and accommodating grooves, and the electric hammer includes movable parts arranged in the accommodating grooves and the guide grooves.

The electric hammer impacts the striking shaft through the impact surface formed by the impact block, and the striking shaft is formed with a force bearing surface for contacting the impact surface to receive the impact force output by the impact block; The ratio of the area to the area of the striking surface is reasonable, and the impact force is transmitted through the cooperation of the striking shaft and the impact block, thereby enhancing the impact force of the electric hammer and effectively prolonging the service life of the electric tool.

Description of drawings

Fig. 1 is the electric hammer schematic diagram of one embodiment;

Fig. 2 is the application scene schematic diagram of the electric hammer of Fig. 1;

Fig. 3 is the sectional view of the electric hammer of Fig. 1;

Fig. 4 is the internal structure diagram of the electric hammer of Fig. 1;

Fig. 5 is the structural representation of the impact block and the energy storage mechanism of the electric hammer of Fig. 1;

Fig. 6 is the explosion schematic diagram of the impact mechanism of the electric hammer of Fig. 1;

7 is an exploded schematic view of the internal components of the first accommodating portion of the electric hammer of FIG. 1;

Fig. 8 is the relation diagram that the holding mechanism that the electric hammer of Fig. 1 needs to overcome provides holding force and striking shaft displacement;

9 is a schematic diagram of a control flow of an electric hammer according to an embodiment;

FIG. 10 is a schematic diagram of a control flow of an electric hammer according to an embodiment.

Detailed ways

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus the above terms should not be construed as limiting the invention.

1 to 3, an electric hammer 300 is provided. The electric hammer 300 includes a striking shaft 11, and the striking shaft 11 includes a striking end 1111 that can reciprocate along the first axis 200 and can strike the fastener 100 during movement, Strike end 1111 is formed with strike face 1123 that contacts fastener 100 . In this embodiment, the fastener 100 is a nail.

The electric hammer also includes an impact mechanism 10 and a drive mechanism 20, the drive mechanism 20 is used to drive the impact mechanism 10, the drive mechanism 20 includes a motor 21, and the motor 21 includes a motor shaft 24; the impact mechanism 10 is used to impact the striking shaft 11 to reciprocate; the impact mechanism 10 includes an impact block 12 formed with an impact surface 1122 for contacting the striking shaft 11 to output impact force to the striking shaft 11 and a support shaft 70 for supporting the impact block 12 .

The electric hammer also includes a transmission mechanism 30 that connects the motor shaft 24 and the impact mechanism 10 , and transmits the rotational force output by the motor 21 to the support shaft 70 of the impact mechanism 10 through the transmission mechanism 30 . The support shaft 70 is coupled to the striking shaft 11 and provides energy, and the striking shaft 11 is driven to perform a reciprocating impact action to provide impact pulses to drive the fastener 100 into the substrate.

The support shaft 70 connects the transmission mechanism 30 and the striking shaft 11 , and the support shaft 70 converts the rotational motion of the driving mechanism 20 into the reciprocating impact motion of the impact block 12 along the first axis 200 . As shown in FIG. 2 , the electric hammer 300 is used to drive the fastener 100 into the base material, and the striking shaft 11 directly acts on the fastener 100 to strike the fastener 100 along the direction of the first axis 200 to make the fastener 100 Enter the substrate. The electric hammer 300 includes a front end device 14, and the front end device 14 has a striking opening. By placing the fastener 100 into the striking opening, the front end device 14 impacts the fastener 100 relatively, and the impact component provides multiple pulses to strike the fastener 100 into the hammer. substrate.

The electric hammer 300 further includes a power source and a casing 50 . The power source is connected to the driving mechanism 20 and provides energy to the driving mechanism 20 to make the driving mechanism 20 operate. The casing 50 wraps the internal parts of the electric hammer 300 and is used by the user to hold. The casing 50 includes a second accommodating portion 51 and a first accommodating portion 52 .

Referring to FIGS. 1 and 4 , the first accommodating portion 52 is formed around a first accommodating cavity 521 extending substantially in a first linear direction. The striking shaft 11 is at least partially supported in the first accommodating cavity 521 along the first linear direction, and the striking mechanism 10 is disposed in the first accommodating cavity 521 . The second accommodating portion 51 is formed with a second accommodating cavity 511 extending substantially along the second linear direction. The motor 21 is disposed in the second accommodating cavity 511 , and the second accommodating portion 51 is disposed on the lower side of the first accommodating portion 52 . The second accommodating part 51 further includes a holding part 511 for the user to hold. The first straight line and the second straight line are perpendicular to each other, the first straight line is parallel to the first axis 200 , and the second straight line is perpendicular or approximately perpendicular to the first axis 200 . The impact block 12 is in surface contact with the striking shaft 11 to transmit the impact force to the striking shaft 11 . In this way, on the one hand, the contact form between the striking shaft 11 and the striking block 12 is surface contact, so that the striking block 12 can reliably transmit the impact force to the striking shaft 11, thereby improving the impact strength; The contact surface between the block 12 and the striking shaft 11 is relatively large, so that under the same impact force, the pressure on the impact block 12 and the striking shaft 11 is smaller than that of the smaller contact surface, thereby avoiding The impact block 12 and the striking shaft 11 may be broken due to insufficient strength of 1; in addition, the contact surface between the impact block 12 and the striking shaft 11 is relatively large, thereby reducing the speed at which the impact block 12 and the striking shaft 11 are worn, The service life of the electric hammer 300 is prolonged.

In this embodiment, the electric hammer 300 basically has a "T" structure, and the casing 50 includes a first accommodating portion and a second accommodating portion. It is worth mentioning that in some other embodiments, the relative relationship between the second accommodating part and the first accommodating part can also be designed in other types, for example, it can be an "L"-shaped structure, and the shape of the electric hammer 300 can also be determined not only by The second accommodating portion is formed with the first accommodating portion, and other elements such as connecting arms, support arms, etc. can also be provided, and the electric hammer 300 is formed into an “L” shape, a rectangular shape, etc. through various connection methods, which will not be detailed here. described.

Optionally, in order to optimize the overall structure of the electric hammer 300, the transmission shaft 34 and the striking shaft 11 are arranged in parallel, so that the projection of the second accommodating portion 51 along the second linear direction does not exceed that of the first accommodating portion along the second linear direction. Preferably, the second accommodating portion 51 is relatively connected to the middle portion of the first accommodating portion, so that the electric hammer 300 forms a T-shaped structure, and the rear edge of the grip portion 511 is designed to be recessed forward to match the user’s grip on the grip portion. 511 attitude. The design of the projection of the second accommodating portion 51 in the second straight line direction does not exceed the projection of the first accommodating portion along the second straight line direction, so that when the user holds the grip portion 511, the projection of the hand in the second straight line direction does not exceed The projection of the first accommodating portion in the second straight line direction, so that the electric hammer 300 can be operated to work in a relatively narrow space, and the applicability of the electric hammer 300 is improved.

Correspondingly, the striking shafts 11 are distributed on both sides of the straight line where the motor shaft 24 is located. The motor shaft 24 , the support shaft 70 and the striking shaft 11 are arranged in one plane, so that the electric hammer 300 has a compact arrangement and a small size. With the above arrangement of the whole machine, the ratio of the maximum size of the casing 50 along the first linear direction to the maximum size of the casing 50 along the second linear direction can be greater than or equal to 0.5 and less than or equal to 0.8, thereby matching The state in which the user holds the electric hammer 300 makes the electric hammer 300 lighter as a whole, and is suitable for a narrow operating space.

In particular, the present invention includes a detection assembly 40 , which is configured to sense a user's activation action, and generate an electrical signal a to activate the reciprocating striking motion of the impact mechanism 10 after sensing the activation action. Preferably, the detection assembly 40 is disposed on the casing 50 of the first accommodating portion 52, and detects the displacement state of the striking shaft 11 to obtain the user's stapling action.

The electric hammer 300 includes a trigger switch 82 for controlling the motor 21 to be turned on and off. The trigger switch 82 is disposed on the casing 50 for the user to hold and control.

Specifically, the striking shaft 11 can move forward relative to the casing 50 along the first axis 200 to the first position and can move backward to the second position; when the striking shaft 11 moves backward relative to the casing 50 along the first axis 200 The motor 21 is activated when the trigger switch 82 is activated to the second position or to a third position between the first position and the second position. It is worth mentioning that the second position is not necessarily the farthest distance that the striking shaft 11 moves backward on the first axis 200, but refers to the regular reciprocating motion of the striking shaft 11 on the first axis 200, and at the first The striking shaft 11 contacts the striking block 12 at two positions. In particular, the impact direction 15 of the electric hammer 300 is defined as the direction from the second position to the first position.

The electric hammer 300 includes a detection assembly 40 and a control device 60, the control device 60 is connected with the motor 21 to control whether the motor 21 is activated; the detection assembly 40 includes a state sensor for detecting the displacement of the striking shaft 11, in the direction of the striking shaft 11 along the first axis 200 When moving backward to the second position or moving to a third position between the first position and the second position, and when the trigger switch 82 is triggered, a signal is sent to the control device 60 to control the motor 21 to start. In some embodiments of the present invention, when the striking shaft 11 contacts the impact block 12, the motor 21 is directly triggered to start. Alternatively, in other embodiments of the present invention, after the detection component detects that the striking shaft 11 contacts the impact block 12, the motor 21 is directly triggered to start; or, the detection component detects that the striking shaft 11 contacts the impact After block 12, a signal is sent to the controller, and the controller controls the motor 21 to start, which is not limited herein.

The state sensor is a Hall sensor 41 , the detection assembly 40 also includes a first-type magnetic member 42 arranged opposite to the Hall sensor 41 , the striking shaft 11 is at least partially set as a magnetic member, and the Hall sensor 41 detects that the striking shaft 11 is in the first type. A state of displacement between a position, a second position and a third position. The detection assembly 40 is fixed by the casing 50 and opposite to the striking shaft 11 , and when the striking shaft 11 moves to the first position, the striking shaft 11 and the detection assembly 40 fit together. When the electric hammer 300 is running, the detection assembly 40 detects the striking state of the firmware 100 such as nails, and generates an electrical signal b after detecting that the striking is completed to stop the reciprocating striking motion of the impact mechanism 10 to turn off the electric hammer 300 . In one embodiment, the detection assembly 40 detects the displacement of the striking shaft 11 during the impact process, and controls the motor 21 to stop when the displacement change of the striking shaft 11 exceeds a threshold or the trigger switch 82 is turned off. That is, the change value of the displacement of the striking shaft 11 is obtained, and the first derivative of the displacement of the striking shaft 11 is obtained as the detection value. When the detection value is greater than the threshold value, it is determined that the striking is completed, the striking shaft 11 is released, and the electric signal b is sent to control the rotation of the motor 21 to stop. It can be understood that, by taking the first derivative of the displacement speed of the striking shaft 11 , when the obtained first derivative suddenly exceeds a preset threshold, it is determined that the striking is completed and the motor 21 is controlled to stop.

It is worth mentioning that the state sensor may also be a pressure sensor, an air pressure sensor, a photoelectric sensor, etc., which can detect the displacement or movement of the striking shaft 11, which will not be described in detail here.

The electric hammer 300 also includes a control device 60 connected to the driving mechanism 20 . Preferably, the control device 60 includes a circuit board 61 to be wired or wirelessly connected to the driving mechanism 20 through the circuit board 61 , and control the electric motor by controlling the operation of the driving mechanism 20 . The operating state of the motor 21 of the hammer 300 is that it is turned on and off. The detection component 40 is connected to the circuit board 61 , and generates an electrical signal a to the control device 60 after detecting the action of the staple. The control device 60 reads the electrical signal a and controls the driving mechanism 20 to drive the impact mechanism 10 to reciprocate.

After detecting that the striking shaft 11 is released, the detection component 40 generates an electrical signal b and sends it to the control device 60. Further, when the user turns off the control trigger switch 82, the electrical signal b is also generated and sent to the control device 60, and the control device 60 generates an electrical signal b. 60 controls the driving mechanism 20 to stop to end the striking action of the electric hammer 300 . By setting the detection component 40, the motor 21 is no longer idling, has a longer life, good reliability, and is sensitive to the user's operation, which improves the user's operation experience and effectively improves the use efficiency.

It is worth mentioning that the detection assembly 40 can also be set as a mechanical clutch device, that is, the user presses the firmware 100 to push the detection assembly 40 to displace, so that the detection assembly 40 triggers the motor 21 to run through the connecting rod or the connecting piece. After the base material, the detection component 40 is no longer pushed for displacement. At this time, the mechanical clutch disengages the connecting piece or the connecting rod, and the motor 21 stops rotating. Common techniques of those skilled in the art will not be described in detail here.

The striking shaft 11 includes a shaft body 111 and a striking front end 112. The shaft body 111 penetrates the striking front end 112, or extends relatively vertically from both ends of the striking front end 112, and the shaft body 111 fixes the striking front end 112. Preferably, the striking front end 112 and The shaft body 111 is integrally formed.

As shown in FIG. 6 and FIG. 7 , the shaft body 111 has a striking end 1111 forming one end thereof, the striking end 1111 is provided with a flat bottom surface, and the striking end 1111 is arranged inside the striking port, and is contacted and struck by the striking end 1111 Firmware 100. The striking end 1111 receives the supporting force of the firmware 100 and cooperates with the striking mechanism 10 so that the striking shaft 11 can reciprocately strike. When the striking shaft 11 reciprocates, the striking end 1111 reciprocates along the inside of the striking opening, so as to nail the fastener 100 into the base material. It can be understood that the shaft body 111 can be set to a corresponding hollow structure or a solid structure according to the performance requirements of the electric hammer 300 .

Preferably, the detection assembly 40 is arranged near the striking front end 112, and senses the axial displacement of the striking front end 112 to obtain the starting action and the completion state of the electric hammer 300, so as to generate signals to control its operation and stop.

6 , the impact mechanism 10 further includes an elastic device 13 and an impact block 12 , the elastic device 13 is set to be sleeved on the impact block 12 , the impact block 12 is sleeved to the support shaft 70 , and the support shaft 70 receives the rotation of the drive mechanism 20 The driving force is converted into linear impact motion to the impact block 12 to drive the impact block 12 to perform impact motion, and the impact block 12 impacts the striking shaft 11 to repeatedly strike the fastener 100 and nail it into the substrate. Preferably, the elastic device 13 is a spring, and the elastic device 13 is used to assist the reciprocating impact motion of the impact block 12 and store and provide part of the energy of the impact block 12 to generate the impact motion. In order to increase the impact force of the impact block 12 , the stiffness coefficient of the elastic device is within the range of 30-45N/mm, thereby increasing the elastic force of the elastic device and the impact force of the impact block 12 .

The impact block 12 has a first interceptor and an impact body 122. The first interceptor is disposed at the end of the impact body 122 and protrudes to the periphery relative to the impact body 122. The impact body 122 constitutes the main body of the impact block 12 and is used for the impact block. 12 shocks. The first intercepting piece is used for intercepting and fixing the elastic device 13 to prevent the elastic device 13 from being detached from the impact block 12 . When the elastic means 13 is implemented as a spring, the first intercepting member has an intercepting end into which an end of the spring is placed, the intercepting end assisting in compressing the spring.

The electric hammer 300 also includes a buffer assembly 80 disposed between the impact mechanism 10 and the casing 50 , the buffer assembly 80 at least includes a buffer washer 81 and a rubber ring 83 , and the buffer washer 81 is disposed between the rubber ring 83 and the impact mechanism 10 . . More specifically, when the impact block 12 and the inner impact block 12 impact the striking shaft 11, the buffer assembly 80 may partially impact the casing 50. In order to enhance the strength of the casing 50 and prolong its service life, the buffer assembly 80 is provided, And it has the effect of shock absorption of the whole machine. The buffer gasket 81 is arranged between the rubber ring 83 and the impact block 12 , the impact block 12 impacts the buffer gasket 81 , and the buffer gasket 81 increases the force bearing area of the buffer assembly 80 , effectively increasing the buffer effect of the buffer assembly 80 . Preferably, both the rubber ring 83 and the buffer washer 81 are circumferentially arranged on the casing 50 . Optionally, the buffer assembly 80 further includes a fixing member, through which the buffer washer 81 and the rubber ring 83 are fixedly connected.

As shown in FIG. 5 and FIG. 6 , the electric hammer 300 further includes a conversion connector 72 . One end of the support shaft 70 is clamped to the transmission mechanism 30 and fixed to the transmission mechanism 30 in a relatively movable manner, so as to be driven by the transmission mechanism 30 to rotate together. The conversion connector 72 is engaged with the support shaft 70 and the impact block 12, and the conversion connector 72 slides in a certain orbit between the impact block 12 and the support shaft 70, thereby driving the relative movement between the support shaft 70 and the impact block 12, and The rotational motion of the support shaft 70 is converted into the impact reciprocating motion of the impact block 12 .

Further, the striking shaft 11 and the striking mechanism 10 are rotatably connected, and the striking mechanism 10 only applies the striking force to the striking shaft 11 without applying the rotational force.

The conversion link 72 is configured as a spherical body, so that it can slide stably between the impact block 12 and the support shaft 70 . Correspondingly, the impact block 12 has an accommodating groove 121 formed on its inner wall surface, which is set in a hemispherical shape and matches the spherical shape and size of the conversion connector 72 , so that the conversion connector 72 can be half or partially inserted into the receiving groove Slot 121, and can slide in it.

The support shaft 70 includes a support shaft body, and has a guide groove 711 on which the surface of the support shaft body is provided. The support shaft body is hollow and surrounds a part of the striking shaft 11, thereby saving space. The striking shaft 11 can linearly reciprocate toward the striking direction relative to the supporting shaft body. The guide groove 711 surrounds the support shaft. The preferred guide groove 711 is recessed inward from the outer surface of the support shaft, and has at least one guide edge, a first transition area and a second transition area, the guide edge is formed on the edge of the guide groove 711 , and the guide edge is arranged along with the guide groove 711 It is a undulating shape of a curve. The guide grooves 711 respectively convert the lifting and lowering of their tracks at the first switching area and the second switching area. Here, the impact direction 15 is defined as downward, and corresponds to the lower position of the relative position of the guide groove 711 .

The guide groove 711 located in the first conversion area is located opposite to the lowest point of the support shaft body, and the guide groove 711 located in the second conversion area is located opposite to the highest point of the support shaft body. Extend to the second conversion area, and then extend from the second conversion area to the first conversion area, so that the guide groove 711 surrounds the support shaft body, and the conversion link 72 cyclically slides from the first conversion area on the guide groove 711 to the second transition area and slide back to the second transition area.

The depth of the guide groove 711 matches the spherical radius of the conversion connector 72, so that the depth of the guide groove 711 is slightly greater than or equal to the spherical radius of the conversion connector 72. The track of the second transition zone moves up smoothly, and in the clockwise direction, the track from the second transition zone to the first transition zone falls rapidly. The conversion link 72 slides around the support shaft 70 in the guide groove 711 , and is limited by the guide grooves 711 with different heights in the support shaft 70 along with the rotating action, thereby changing the relative upper and lower positions.

By installing the conversion connection piece 72 into the accommodating groove 121 and the guide groove 711, because the impact block 12 is sleeved on the outer ring of the support shaft 70, and the conversion connection piece 72 limits the relative movement of the impact block 12 and the support shaft 70, the accommodating groove 121 and the guide groove 711 will not be disengaged by relative displacement, so the impact block 12 is driven to move by the sliding track of the conversion link 72 in the guide groove 711, so as the conversion link 72 moves up and down in the guide groove 711, It is driven up and down to impact in the direction of impact 15 . Therefore, in actual work, the clamping slider is limited by the guide groove 711 to move back and forth in the impact direction 15 .

Since the groove walls of the accommodating groove 121 and the guide groove 711 are set to be smooth and match the shape of the conversion connector 72, the sliding of the conversion connector 72 between the accommodating groove 121 and the guide groove 711 is smooth, and the conversion connector 72 and the impact block 12 transmit impact force through surface contact, and transmit energy through line contact with the support shaft 70, which greatly reduces the wear on the conversion connector 72, thereby increasing the service life of the electric hammer 300.

Correspondingly, the support shaft 70 has a second intercepting member 716, the second intercepting member 716 is disposed at one end of the supporting shaft body, the second intercepting member 716 is disposed opposite to the first intercepting member, and passes through the first intercepting member and the first intercepting member. The cooperation of the two intercepting members 716 relatively defines the displacement space of the elastic device 13 , so that the elastic device 13 is confined in the impact block 12 .

When the striking front end 112 is pressed to trigger the detection component 40, the detection component 40 sends an electrical signal a to the driving mechanism 20, and the driving mechanism 20 drives the support shaft 70 to rotate at a high speed through the transmission mechanism 30, and the rotating support shaft 70 drives the clamping slider In the accommodating groove 121, it rotates relatively around the clamping shaft, and due to the trajectory change of the accommodating groove 121, the limit clamping sliding block moves back and forth in the corresponding axial impact direction 15, so as to drive the clamped impact block 12 to correspond. impact displacement.

When the conversion connector 72 slides from the first conversion area to the second conversion area, the impact block 12 is driven to move in the opposite direction of the striking direction, the first intercepting piece of the impact block 12 compresses the elastic device 13, and the elastic device 13 is The impact energy of the impact block 12 is compressed and stored. When the conversion connector 72 slides to the second conversion area in the receiving groove 121, the impact block 12 is driven to impact and displace in the striking direction, and the compressed elastic device 13 decompresses and releases the impact energy and The impact blocks 12 are collectively impacted toward the striking direction, and the stored energy is transferred to the impact block 12 through the first intercepting piece. After the conversion connector 72 slides to the first conversion area again, the reciprocating impact action is repeated until the detection component 40 senses the completion of the impact action, and controls the drive mechanism 20 to close, thereby ending the reciprocating impact action of the impact block 12 .

The striking shaft 11 is formed with a force-receiving surface 1121 for contacting the impact surface 1122 to receive the impact force output by the impact block 12; The ratio of the area of the attached surface to the area of the striking surface 1123 is greater than or equal to 0.5 and less than or equal to 20. Preferably, the force bearing surface 1121 is a plane. Therefore, the impact strength of the impact block 12 on the striking shaft 11 is improved, and the impact stability is improved, thereby effectively prolonging the service life of the striking shaft 11 .

The impact surface 1122 is far away from the striking end 1111 relative to the force bearing surface 1121 , and the impact block 12 moving toward the impact direction 15 acts on the striking front end 112 and impacts the force bearing surface 1121 , thereby providing impact force for the striking shaft 11 and striking the striking shaft 11 . The end 1111 contacts the fastener 100 and strikes the fastener 100 into the substrate by impact. When the electric hammer 300 is not running or the striking shaft 11 hits the limit of its striking direction, the striking surface 1122 is attached or adsorbed to the casing 50 of the front end device 14 , and is attached to or has the closest distance to the detection component 40 . Therefore, the manufacturing material of the position corresponding to the detection component 40 at least on the impact surface 1122 of the striking shaft 11 should be made of a magnetically attractive ferromagnetic material.

When the user presses the electric hammer 300, the striking shaft 11 is subjected to the reaction force of the firmware 100. After a single striking action is completed, the impact block 12 is driven by the support shaft 70 to compress the elastic device 13, and the striking shaft 11 is forced toward the impact direction 15. The movement is reversed, and the elastic device is compressed until the impact block 12 strikes again, the striking shaft 11 is stressed again and strikes the firmware 100, and the operation is repeated until the striking is completed.

When the detection assembly 40 is arranged to sense the user's stapling action based on the Hall principle and the stapling is completed, further, the striking shaft 11 can move relative to the casing 50 to the first position and the second position along the first axis 200; When the striking shaft 11 moves to the first position, the impact block 12 is disengaged from the striking shaft 11 ; when the striking shaft 11 moves to the second position, the impact block 12 can contact the striking shaft 11 to output impact force. According to the above characteristics, the electric hammer 300 is designed to further include a holding device 90, which can generate a holding force that drives the striking shaft 11 to keep at the first position; when the striking shaft 11 receives an external force that can overcome the holding force, the striking shaft 11 is moved from the first position by the striking shaft 11. Move to the second position; when the striking shaft 11 is in the first position, the holding device 90 generates a first holding force, and when the striking shaft 11 is in the second position, the holding device 90 produces a second holding force, wherein the first holding force greater than the second holding force.

It can be understood that, in other embodiments, when the state sensor part adopts a Hall sensor, corresponding magnetic parts and ferromagnetic materials can also be provided on the striking shaft and the casing, and the first holding force and the second holding force can be generated. The principle is the same as the above-mentioned embodiment.

The holding device 90 includes a second type of magnetic member 142, the second type of magnetic member 142 is arranged to be fixed by the casing 50, and is arranged opposite to the striking shaft 11, and when the striking shaft 11 moves to the first position, the striking shaft 11 and The second type of magnetic member 92 is attached. It can be understood that the second type of magnetic element 92 may be disposed on the same plane as the first type of magnetic element 42 in the detection assembly 40 . Preferably, in order to ensure the stability and balance of the first holding force and the second holding force, the first type of magnetic members 42 and the second type of magnetic members 92 are respectively provided in multiples and arranged opposite to each other. Preferably, the first type of magnetic members 42 are arranged as two opposite ones, and the second type of magnetic members 92 are also arranged as two opposite ones, and are symmetrically distributed in the casing 50 or the fixing device connected to the casing 50. The magnetic member of the shaft 11 is arranged, and the second type of magnetic member 92 generates a magnetic attraction force to the striking shaft 11, that is, a part of the first holding force and the second holding force are generated, because the first type of magnetic member 42 and the second type of magnetic member 92 are opposite to each other. It is designed so that the magnetic attraction force of the two to the striking shaft 11 is uniform. The first type of magnetic element 42 and the second type of magnetic element 92 are preferably magnets.

It should be noted that here the striking shaft 11 and the first type magnet member 42 are in contact with each other. In some embodiments, it means that a surface provided on the striking shaft 11 and a surface opposite to the first type magnet member 42 are adjacent to each other. Fitting, that is, there is a certain gap between each other, such as a 0.02mm gap.

More preferably, the first type of magnetic member 42 and the second type of magnetic member 92 are set to sink with a certain gap relative to the casing 50 where they are located, and the height of the gap is set to be within 0.4mm, so that the striking shaft 11 is not directly affected during the impact process. Impacting the first-type magnetic element 42 and the second-type magnetic element 92 can effectively prolong the lifespan of the first-type magnetic element 42 and the second-type magnetic element 92 and prevent them from being damaged by excessive impact.

Fig. 8 provides the relation diagram of the holding force and the displacement of the striking shaft 11 for the holding mechanism that needs to be overcome of the electric hammer 300 of Fig. 1; Make the striking shaft 11 move from the first position to the second position. When leaving the first position, it needs to break through the magnetic attraction force of the first type of magnetic member 42 and the magnetically attractive material. As shown in FIG. 8 , it will generate A sudden change of force means that the first holding force needs to be overcome. Therefore, when the user uses the electric hammer 300, there will be an obvious force feedback when striking the firmware 100. The user can perceive the state of pre-strike, and the force feedback is issued and the motor 21 The activation of the electric hammer 300 is almost simultaneous, so it is convenient for the user to control and use the electric hammer 300 .

The holding device 90 further includes a restoring elastic piece 91, which is connected with the striking shaft 11, and provides a part of the second holding force when the striking shaft is in the second position. Optionally, the elastic member is arranged to connect the end of the shaft body 111 of the non-strike end 1111 of the striking shaft 11, and is connected to the inner wall of the cavity where the striking shaft 11 is located. The striking shaft 11 is fixed in the impact direction 15 , and at this time, the striking front end 112 is in contact with the detection component 40 .

The casing 50 includes an outer casing 53 and an inner casing 54. The outer casing 53 is formed at the outermost part of the electric hammer 300 and surrounds its internal components. The outer casing 53 is preferably a plastic casing 50, which is used by the user to hold its shape. It is set to have radians and textures that are convenient for users to hold, so as to be convenient for users to hold and use. The outer casing 53 has a certain heat insulation effect to prevent the user from scalding the user due to heat generated by the tool when the user uses the electric hammer 300 . The inner casing 54 is formed in the first accommodating portion 52 and located inside the outer casing 53 . When the detection component 40 is configured to sense the user's action based on the Hall principle, the material of the inner casing 54 cannot be selected from magnetic materials, so as to prevent the inner casing 54 from interfering with the detection result of the Hall sensor 41 . Preferably, the inner casing 54 is made of aluminum, which has a certain effect of heat conduction and heat dissipation.

The detection assembly 40 is installed in the inner casing 54 so that the Hall sensor 41 faces the disposition of the inner casing 54 relative to the first type magnetic member 42 . The detection assembly 40 is arranged near the striking front end 112, and when the striking front end 112 is impacted and moved down to its limit, the striking front end 112 and the first type magnetic member 42 are in surface contact or have the closest distance, and this state is defined as a fit. state. In the process of changing the distance between the striking front end 112 and the first-type magnetic member 42, because the striking front-end 112 is made of ferromagnetic material, it affects the magnetic field lines generated by the first-type magnetic member 42, so that the Hall sensing device captures the magnetic field The distribution of the wires changes states, and converts them into electrical signals and sends them to the control device 60 , and the control device 60 analyzes the corresponding operating states and controls the drive mechanism 20 to execute.

When the electric hammer 300 is not placed in the firmware 100, the striking front end 112 is fixed downward, the striking end 1111 is in contact with the tool bushing, and the striking front end 112 moves down to contact the detection assembly 40 or is the closest. Specifically, in the natural state in which the electric hammer 300 is not placed in the firmware 100, the striking front end 112 is at the extreme position of the striking direction of its movable range, and the striking surface 1123 of the striking front end 112 is attached to the first type of magnetic member 42 at this time, Because the striking front end 112 is at least partially made of ferromagnetic material, the striking front end 112 and the first type magnetic member 42 of the detection assembly 40 attract each other.

When the user needs to nail the firmware 100 into the base material, he places the firmware 100 into the striking port, and the firmware 100 with a certain height pushes the striking end 1111 inside the striking port toward the inside of the electric hammer 300, and the striking shaft 11 is at this time. It drives the whole body to move upward, that is, it moves relatively away from the striking port, because the material of the striking shaft 11 is selected as a ferromagnetic material. The suction state of the component 42 and the second type of magnetic component 92 can be changed to change their suction state. The user only needs to provide a slight pressure to the electric hammer 300 to change the suction state of the two, and can activate the detection component 40 and the detection component. 40 sends an electrical signal a to the control device 60 to control the driving mechanism 20 to run and execute the striking action.

During the reciprocating movement, the relative position of the striking front end 112 and the detection component 40 changes with the reciprocating movement.

After the electric hammer 300 operates the reciprocating striking action to knock the firmware 100 into the base material, the striking end 1111 is no longer subjected to the reaction force of the firmware 100, so that the reciprocating motion can be stopped in the striking port, so as to strike the front end 112 and the detection component 40 in contact with each other. The time interval is increased, and the monitoring value of the activation interval is set to m. When the gap between the fit state between the striking front end 112 and the detection component 40 is greater than m, the detection component 40 sends an electrical signal b to the control device 60 to determine that the impact is currently completed. , control the driving mechanism 20 to stop running to end the impact operation of the electric hammer 300 .

The activation interval m corresponds to the structural specification of the electric hammer 300. Preferably, the activation interval m is selected as 0.5s, that is, when the bonding time interval between the striking front end 112 and the detection assembly 40 is greater than 0.5s, the electrical signal b is sent to the control The device 60 stops the impact operation of the electric hammer 300 .

In one embodiment of the present invention, the detection of the end state of the electric hammer 300 is implemented as the detection of the engagement time of the striking front end 112 and the detection assembly 40 . After the electric hammer 300 runs the reciprocating striking action to knock the firmware 100 into the base material, the striking end 1111 is no longer obstructed by the firmware 100, so that the impact can be stopped at the striking port, so that the striking front 112 is fitted with the detection component 40, and the setting is activated The monitoring value of the interval time is n. When the bonding time between the striking front end 112 and the detection component 40 is greater than n, the detection component 40 sends an electrical signal b to the control device 60 to determine that the impact is currently completed, and control the drive mechanism 20 to stop running to The impact operation of the electric hammer 300 is completed. Preferably, n is selected as 1s.

Preferably, in order to enhance the impact force of the electric hammer 300 , a striking block is provided connected to the striking front end 112 , the striking block is adjacent to the front end device 14 relative to the striking front end 112 , and the striking block and the striking front end 112 are integrally formed. The striking block is set to have a cross-sectional radius smaller than the cross-sectional radius of the striking front end 112 , so that it can reciprocate in the striking port without being intercepted by the casing 50 near the front end device 14 . The striking block has a certain thickness to ensure the strength of the striking mechanism 10 and provide a stable striking force.

The front end device 14 is disposed at the end of the first accommodating portion 52, and includes a nail head shell 142 and a positioning member 141. The positioning member 141 is sleeved with the striking shaft 11 to limit the linear impact motion of the striking shaft 11, so as to ensure the electric hammer 300 The Stability of the Blow Firmware 100. The stud head shell 142 surrounds to form a strike port and is used to secure the fastener 100 relative to it.

Preferably, the impact mechanism 10 includes a nailing mechanism 144 disposed on the front end device 14 , and the nailing mechanism includes a third type of magnetic member 143 for attracting the fastener 100 . The nail head shell 142 is provided with a fixing nail mechanism 144. When the fastener 100 has magnetic attraction such as nails, the nail head shell 142 can directly adsorb the firmware 100 at the striking port through the third type of magnetic member 143, so that no manual operation of the user is required. The supporting firmware 100 is convenient for the user to operate and use the electric hammer 300 with one hand, and the damage to the user is reduced. It can be understood that the first type of magnetic member 141 , the second type of magnetic member 142 , and the third type of magnetic member 143 may be of the same material, and are differentiated due to different usages and locations.

The nail head shell can move relative to the casing 50 in the first linear direction. Preferably, the nail head shell is connected to the casing 50 through the front end elastic member 145. The base material is driven into the base material, which compresses the stud head shell so that the fastener 100 can be driven completely into the base material.

Preferably, the driving mechanism 20 , the power supply, and the control device 60 are arranged in the second accommodating portion 51 , and the impact mechanism 10 and the supporting shaft 70 are arranged in the first accommodating portion 52 , so that the electric hammer 300 has a uniform structure. The driving force of the driving mechanism 20 is transmitted into the first accommodating part 52 through the transition structure provided between the second accommodating part 51 and the first accommodating part 52 . It can be understood that one of the driving mechanism 20, the power supply, the control device 60 or any combination thereof can be provided in the first accommodating portion 52, so the second accommodating portion 51 is not necessary in the present invention, and can be provided with the first accommodating portion 51. Section 52 mounts all internal components.

The motor 21 includes a stator and a rotor, which cooperate to generate an alternating magnetic field and drive the motor shaft 24 to rotate. The rotor is provided with a first-type magnetic member 42, and at least one Hall sensor 41 is provided near the rotor, and its detection information is transmitted. to the control device 60 to obtain the operation state of the motor 21 to analyze the operation of the electric hammer 300 .

The transmission mechanism 30 includes a meshed first gear 31 , a second gear 32 and a pair of bevel gears 33 . The first gear 31 meshes with the transmission shaft 34, the second gear 32 is connected to the support shaft 70, and the bevel gear 33 meshes with the motor shaft 24 and the transmission shaft 34, so as to transmit the energy of the driving mechanism 20 from the second accommodating portion 51 to the transmission shaft 34 through the bevel gear 33. inside the relatively vertical first accommodating portion 52 . It is worth mentioning that the relative upper and lower relationship of the bevel gears 33 can be reversed, so as to achieve the purpose of saving space.

The transmission mechanism 30 also includes a connecting piece that meshes with the second gear 32, one end of which is meshed with the second gear 32, and one end is connected to a supporting shaft 70 that cannot be rotated relative to it, so as to couple the supporting shaft 70 and the driving mechanism 20 to be driven by it , and drive the support shaft 70 to perform a rotational motion, and drive the impact block 12 to perform an impact motion through the energy conversion of the support shaft 70 .

The electric hammer 300 also includes a switch for controlling the opening and closing of the motor 21. Preferably, the trigger switch 82 controls the opening and closing of the motor 21. In one way, the trigger switch 82 can be controlled by controlling the power supply. Before turning on the power, the electric hammer 300 will not run. After the trigger switch 82 is turned on, the user presses the hand-held electric firmware 100 through the firmware 100 by triggering the opening action, and the detection component 40 operates to detect and control the impact action of the electric hammer 300.

When performing the starting action, the state process of restraining the magnetic attraction force between the striking front end 112 and the second-type magnetic member 92 and separating the two is easy to obtain, that is, the feedback of separating the adsorbed magnetic element and the feedback of separating the non-magnetic contact element Therefore, the user can easily sense the separation state of the striking front end 112 and the second-type magnetic member 92, and can stop pressing, thereby obtaining the open state of the electric hand-held tool, which is convenient for the user to control the overall process of using the electric hand-held tool. .

It can be understood that, in some embodiments of the present invention, the striking shaft 11 may not be entirely made of ferromagnetic materials, and may be set at a position opposite to the first-type magnetic member 42, or at the portion of the striking front end 112. The material is sufficient to correspond to the triggering condition of the detection component 40 . At the same time, the detection assembly 40 may be arranged on the striking surface 1123 of the striking front end 112, and the first type of magnetic member 42 may be arranged at a corresponding position of the casing 50, which is not limited herein. It can be understood that, in addition to generating the signal for turning on the motor 21 by detecting the displacement change of the striking shaft 11 , other components linked with the striking shaft 11 can also be detected, and a state sensor can be set on other components linked with the striking shaft 11 . The displacement drives the displacement of other components, and obtains the user's pressing to start the action.

In some embodiments of the present invention, the detection component 40 is disposed near the top end of the shaft body 111 , and the top end of the shaft body 111 is made of a ferromagnetic material. When the user performs the opening action, the striking end 1111 of the shaft body 111 is jacked up, the detection component 40 senses the displacement change of the shaft body 111 in the running state, acquires the opening action, and generates an electrical signal a to the control device 60 to control the driving mechanism 20 to operate.

The detection assembly 40 can also be arranged near the shaft body 111. At this time, the shaft body 111 at the corresponding position is made of ferromagnetic material. When the user performs the opening action, the striking end 1111 of the shaft body 111 is lifted up, and the detection assembly 40 senses the shaft. The running state of the body 111 changes in displacement, acquires the opening action, and generates an electrical signal a to the control device 60 to control the operation of the driving mechanism 20 .

It can be understood that the detection component 40 can be set at any other position that can sense the user-started action, and the automatic acquisition of the user-started action can be completed by setting the magnetic material at the corresponding position to cooperate.

In one embodiment of the present invention, the detection component can also select not limited to any number of gyroscopes, accelerometers, and inertial measurement units, and by detecting the state and position of the impact mechanism, obtain the user's opening action and excite the drive mechanism Run to start the strike action.

In one embodiment of the present invention, the transfer shaft is provided with a receiving groove, the inner wall of the corresponding impact block is provided with a guide groove, and the transfer shaft and the impact block are connected by a conversion connection and convert the driving mechanism into impact energy .

In one embodiment of the present invention, the electric hammer 300 further includes a tool bush provided at its end, preferably the tool bush and the front end device are detachably snapped, the tool bush is detachably connected to the tool, and the tool bush Provided with a receiving element, the tool can optionally be implemented as a hammer, chisel, shovel, etc., and is detachably connected with a tool bush to form a hammer, chisel, shovel, etc. tools. The tool bushing can detachably hold the tool by means of clamping jaws, screw connections, etc.

In an embodiment of the present invention, an impact block is used to replace the striking shaft. In this case, the impact block includes an impact shaft. In this case, at least part of the impact block is provided with a magnetic member, which extends from the impact block to the impact direction to the striking port, and passes through the impact block. The axis hits the firmware directly. The impact shaft is driven by the support shaft to perform a reciprocating impact motion.

FIG. 9 is a schematic diagram of a control flow of the electric hammer 300 according to an embodiment of the present invention. As shown in FIG. 9 , the operation process of the tool is as follows. Taking the Hall sensor 41 as an example for the detection component 40, execute step S1 and press the trigger switch 82, the electric hammer 300 is in the standby state, and the user will execute step S2 to put the firmware 100 into the Strike the mouth, and press the electric hammer 300 toward the impact direction 15 to perform step S3 to press the electric hammer 300 .

Step S4 is performed, and the detection component detects whether the displacement of the striking shaft leaves the first position. Specifically, the electric hammer 300 is pressed by the firmware 100, and the firmware 100 acts on the striking end 1111 of the striking shaft 11 to overcome the elastic force of the elastic device 13 to strike the shaft 11. Move in the opposite direction of the impact direction 15 , that is, the striking shaft 11 leaves the first position. Because of the arrangement of the magnetically attractive material or part of the magnetically attractive material of the striking shaft 11 , the first type of magnetic member 42 changes due to the displacement of the striking shaft 11 . The contact state with the striking front end 112, the two are separated, thereby changing the distribution of the magnetic field lines generated by the first-type magnetic member 42, so that the Hall sensing device detects the transformation of the magnetic field lines, and executes step S5 to activate the Hall sensing device. Send the electrical signal a to the control device 60, and execute step S6, the control device 60 controls the driving mechanism 20 to operate.

During the operation of the driving mechanism 20, step S7 is executed, and the control device 60 detects whether the driving mechanism 20 is running normally. If it is detected that the driving mechanism 20 is not running normally, repeat the step S6. If it is detected that it is running normally, execute the step S8, and the detection component 40 detects the striking shaft. Whether the displacement change of 11 exceeds the threshold, specifically, after the strike is completed, the strike shaft 11 is idling due to inertia. At this time, the displacement change will have a sudden change compared with the strike process. The sudden change data is measured many times in advance and stored in the control device 60. If the sudden change of the displacement of the shaft 11 exceeds the threshold value stored in the control device 60 , it is determined that the striking is stopped, and step S10 is executed to send the electrical signal b to the control device 60 , and the control device 60 controls the drive mechanism 20 to stop running. At any time, step S9 is executed, the trigger switch 82 is turned off, and the driving mechanism 20 will stop running.

FIG. 10 is a schematic diagram of a control flow of an electric hammer 300 according to another embodiment of the present invention. As shown in FIG. 10 , the operation process of the tool is as follows. Taking the Hall sensor 41 as an example for the detection component 40, execute step S11 and press the trigger switch 82, the electric hammer 300 is in the standby state, and the user will execute step S12 to put the firmware 100 into Strike the mouth, and push the electric hammer 300 toward the impact direction 15 to execute step S13 to push the electric hammer 300 .

Step S14 is executed, the detection component 40 detects the pressing action, that is, the detection component detects whether the displacement of the striking shaft leaves the first position, specifically, pressing the electric hammer 300 by the firmware 100, the firmware 100 acts on the striking end 1111 of the striking shaft 11, Against the elastic force of the elastic device 13, the striking shaft 11 moves toward the opposite direction of the striking direction 15. Because of the arrangement of the ferromagnetic material or part of the ferromagnetic material of the striking shaft 11, the first type of magnetic member 42 changes and strikes due to the displacement of the striking shaft 11. The bonding state of the front end 112, the two are separated, thereby changing the distribution of the magnetic field lines generated by the first-type magnetic member 42, so that the Hall sensing device detects the transformation of the magnetic field lines, and executes step S15 to excite the Hall sensing device to send electricity. The signal a is sent to the control device 60, and step S16 is executed, and the control device 60 controls the driving mechanism 20 to operate.

During the operation of the driving mechanism 20, step S17 is executed, and the control device 60 detects whether the driving mechanism 20 is running normally. If it is detected that the driving mechanism 20 is not running normally, it controls the driving mechanism to end the operation. If normal running is detected, step S18 is executed, and the detection component 40 detects Whether the activation interval is greater than m, if it is greater than m, execute step S20 to send the electrical signal b to the control device 60, and the control device 60 controls the drive mechanism 20 to stop running. At any time, step S9 is executed, the trigger switch 82 is turned off, and the driving mechanism 20 will stop running.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

It should be understood by those skilled in the art that the embodiments of the present invention shown in the above description and the accompanying drawings are only examples and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified in any way without departing from the principles.

Claims (11)

1. An electric hammer comprising:

the striking shaft comprises a striking end which can reciprocate along a first axis and strike a nail during movement, and the striking end is provided with a striking surface which is contacted with the nail;

the impact mechanism is used for impacting the striking shaft to reciprocate;

a motor for driving the impact mechanism;

a housing for supporting the striking shaft, impact mechanism and motor;

wherein the impact mechanism includes:

an impact block having an impact surface for contacting the striking shaft to output an impact force to the striking shaft;

the supporting shaft is used for supporting the impact block;

the striking shaft is provided with a force bearing surface which is used for contacting with the impact surface to receive the impact force output by the impact block;

when the impact surface is in contact with the force bearing surface for impact, the ratio of the area of the surface, attached to the impact surface, of the force bearing surface to the area of the striking surface is greater than or equal to 0.5 and less than or equal to 20.

2. The electric hammer of claim 1, wherein: the stress surface is a plane.

3. The electric hammer of claim 2, wherein: the striking shaft and the impact mechanism form a rotary connection, and the impact mechanism applies impact force to the striking shaft along the first axial direction.

4. The electric hammer of claim 1, wherein: the electric hammer further comprises a buffer assembly arranged between the impact mechanism and the casing, wherein the buffer assembly at least comprises a buffer gasket and a rubber ring, and the buffer gasket is arranged between the rubber ring and the impact mechanism.

5. The electric hammer of claim 1, wherein: the electric hammer comprises an impact block, a support shaft and an electric hammer, wherein the impact block is provided with an accommodating groove, the support shaft is provided with a guide groove which is opposite to the accommodating groove, the electric hammer comprises a moving part which is arranged in the accommodating groove and the guide groove, and the moving part slides in the guide groove to drive the impact block to do reciprocating impact motion.

6. An electric hammer comprising:

the striking shaft comprises a striking end for striking the nail, and can reciprocate along a first axis;

the impact mechanism is used for outputting impact force to the striking shaft so as to drive the striking shaft to strike the nail;

a motor for driving the impact mechanism;

a housing for supporting the striking shaft, impact mechanism and motor;

wherein the impact mechanism includes:

the impact block is used for impacting the striking shaft in a reciprocating manner;

the supporting shaft is used for supporting the impact block;

the impact block is in surface contact with the striking shaft to transmit the impact force to the striking shaft.

7. The electric hammer of claim 6, wherein at least a portion of the striking shaft is made of a ferromagnetic material.

8. The electric hammer according to claim 6, further comprising a nail holding mechanism disposed at an end of the housing, wherein the nail holding mechanism includes a magnetic member for attracting a fastener.

9. The electric hammer according to claim 6, wherein the striking shaft and the impact mechanism are rotatably coupled, and the impact mechanism applies the impact force to the striking shaft along the first axis.

10. The electric hammer of claim 9, comprising: the electric hammer further comprises a buffer assembly arranged between the impact mechanism and the casing, wherein the buffer assembly at least comprises a buffer gasket and a rubber ring, and the buffer gasket is arranged between the rubber ring and the impact mechanism.

11. The electric hammer of claim 6, wherein: the electric hammer comprises an electric hammer body and is characterized in that the impact block is provided with a guide groove, the support shaft is provided with a containing groove opposite to the guide groove, the electric hammer body comprises a moving part arranged in the containing groove, the moving part is further embedded into the guide groove and can slide in the guide groove, and the moving part drives the impact block to do reciprocating impact motion when sliding in the guide groove.

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