CN218556913U - Pneumatic wrench of pin-free striking mechanism - Google Patents

Abstract

The utility model discloses a pneumatic wrench of a pin-free striking mechanism, which comprises a wrench body, wherein the handle part of the wrench body is provided with a switching valve component, a reversing rod component and a switch component, the head part of the wrench body is formed with a cylinder chamber, and a cylinder is arranged in the cylinder chamber; the front end of the cylinder is provided with a pin-free hammering group; the pin-free hammering group consists of a hammering chamber, an impact rod, a hammering block and a hammering chamber gasket; the hammering chamber is connected with a rotor of the cylinder in a driving way, a hammering chamber gasket is matched with the hammering chamber to form a hammering cavity, a hammering section of the impact rod extends into the hammering cavity, and a hammering block is sleeved on the impact rod; the hammering chamber is formed with a semi-cylindrical pushing block, the impact rod is formed with a hammering surface, and the hammering block is provided with a hammering convex body; the cylinder chamber sets the front shroud, and the anterior segment of jump bit passes the front shroud, and the rear end face processing of jump bit has the pivot hole, and the front end shaping of rotor has the front shaft section that stretches into in the pivot hole. The utility model discloses the structure is succinct, simple to operate to safe and reliable.

Description

Pneumatic wrench of pin-free striking mechanism

Technical Field

The utility model relates to a pneumatic tool, especially a no round pin strikes pneumatic spanner of mechanism.

Background

The pneumatic wrench is a pneumatic tool which has low consumption and can provide high torque output, and can accelerate an object with certain mass to rotate through a continuous power source and then impact the output shaft instantly, so that relatively large torque output can be obtained. The hammering chamber of the traditional pneumatic wrench is connected with the hammering block through the impact pin, the connecting structure is complex, and the assembly is complex. Particularly, the hammering block of a part of the pneumatic wrench and the striking surface of the impact rod are not arranged in a relatively closed space, so that the danger is easy to occur in case of the breakage of the striking surface.

Disclosure of Invention

The utility model aims to solve the technical problem to the current situation of above-mentioned prior art, and provide a structure succinct, the installation is easy to the high no round pin strikes pneumatic wrench of mechanism of security.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

a pneumatic wrench of a pin-free striking mechanism comprises a wrench body, wherein a handle part of the wrench body is provided with an opening and closing valve component, a reversing rod component and a switch component, the head part of the wrench body is formed with an air cylinder chamber with a front opening, and an air cylinder is positioned and arranged in the air cylinder chamber; the front end of the cylinder is provided with a pin-free hammering group; the pin-free hammering group consists of a hammering chamber, an impact rod, a hammering block and a hammering chamber gasket; the rear end of the hammering chamber is connected with a rotor of the cylinder in a driving way, a hammering chamber gasket is matched with a chamber opening plug of the hammering chamber to form a relatively sealed hammering chamber, a hammering section of the impact rod penetrates through the hammering chamber gasket in a rotating way and extends into the hammering chamber, and a hammering block is sleeved on the hammering section of the impact rod; a semi-cylindrical push block for driving the hammering block to rotate is formed on the wall of the inner cavity of the hammering chamber, a hammering surface is formed on the hammering section of the impact rod, a hammering convex body is arranged on the inner wall of the hammering block, and the hammering convex body intermittently impacts the hammering surface to rotate the impact rod in the rotating process of the hammering block; the cylinder chamber sets and is used for covering the preceding protecting cover that protects the hammering chamber, and the anterior segment of jump bit passes the preceding protecting cover with rotating the support, and the rear end face of jump bit has the pivot hole along the processing of axle center, and the front end shaping of rotor has the front shaft section that stretches into in the pivot hole and be used for rotating the support jump bit.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the rear end of the hammering chamber is formed with a spline hole, and the peripheral surface of the rotor is provided with a spline rack which is in spline connection and assembly with the spline hole; a semi-cylindrical push groove matched with the semi-cylindrical push block of the hammering chamber is formed on the peripheral surface of the hammering block.

The front protecting cover is fixedly assembled with the cylinder chamber through four long bolts, and a sealing gasket for sealing is pressed between the front protecting cover and the front opening of the cylinder chamber; the front end of the front protecting cover is formed with a bearing hole, an oil-containing shaft sleeve is positioned and installed in the bearing hole, and the impact rod is rotatably penetrated and matched with the oil-containing shaft sleeve; the front protecting cover is provided with an oil filling nozzle, and an adjusting O-shaped ring and a C-shaped retaining ring are arranged in an annular groove at the front end of the impact rod.

The cylinder consists of a cylinder body, a rotor and blades; the cylinder body consists of a cylinder barrel, a front end plate arranged at the front end of the cylinder barrel and a rear end plate arranged at the rear end of the cylinder barrel; the cylinder barrel, the front end plate and the rear end plate are fixedly connected into a whole by round head screws; roller bearings for rotatably supporting the rotor are mounted on the front end plate and the rear end plate, the rotor is sleeved and matched with the inner circle of the roller bearings, and the blades are clamped on the rotor; the cylinder barrel is formed with an exhaust port and an air inlet, and the air inlet is provided with an air inlet sealing ring.

A reversing rod assembly cavity for mounting a reversing rod assembly is formed at the upper end of the handle of the wrench body, and the reversing rod assembly consists of a reversing rod, a reversing sleeve and a reversing deflector rod; the reversing rod is rotatably arranged in the reversing rod assembly cavity, and a reversing rod sealing ring which is hermetically matched with a cavity opening of the reversing rod assembly cavity is sleeved on the reversing rod; the reversing sleeve is positioned and sleeved at the outer end of the reversing rod, the reversing deflector rod is sleeved on the reversing sleeve through the cylindrical pin locking sleeve, and the reversing deflector rod drives the reversing rod to rotate through the forward and reverse shifting reversing sleeve to change the air inlet direction of the air cylinder.

The reversing sleeve is provided with a positioning device which is used for positioning the position of the reversing rod after the reversing rod rotates and reverses to the position; the positioning device consists of a positioning steel ball and a positioning spring; the positioning spring is pressed in a positioning hole formed in the reversing sleeve through a positioning steel ball, and the positioning steel ball is matched with a positioning channel formed in the reversing rod assembly cavity in a rolling and abutting mode.

An air inlet channel and an air outlet channel are formed in the handle part of the wrench body, the upper end of the air inlet channel is communicated with the bottom of the reversing rod assembly cavity, and the upper end of the air outlet channel is communicated with the middle of the reversing rod assembly cavity; the wrench body is formed with an exhaust hole and an air inlet hole which are communicated with the reversing rod assembly cavity, the reversing rod is matched with the reversing rod assembly cavity to form an exhaust gap for communicating the exhaust channel and the exhaust hole, and the reversing rod is formed with a middle pore channel for communicating the air inlet hole and the air inlet channel.

An air inlet joint which is conveniently connected with an air source is arranged in the opening of the air inlet channel through an elastic cylindrical pin anti-falling clamp, a joint gasket is arranged on the air inlet joint in a gasket mode, and three joint sealing rings which play a role in sealing are sleeved on the air inlet joint; a silencer is arranged in the opening of the exhaust passage.

A step surface is formed in the air inlet channel, and a framework oil seal is hermetically arranged on the step surface; the open-close valve assembly comprises an open-close valve body and an open-close valve spring; the switching valve body is composed of a valve rod and a valve seat, the valve rod penetrates through the framework oil seal in a sliding mode and extends into the bottom of the cavity of the reversing rod assembly cavity, the valve seat is connected with the framework oil seal in a sealing mode in an abutting mode to form a throat opening used for controlling air inlet on-off, the upper end of the switching valve spring is connected to the valve seat in an abutting mode, and the lower end of the switching valve spring is pressed to the air inlet connector in an abutting mode.

The switch assembly consists of a mandril and a trigger; the ejector rod passes through the reversing sleeve and the reversing rod in sequence in a sliding manner to be abutted with the upper end of the valve rod of the switching valve body, an ejector rod sealing ring for preventing air leakage is sleeved on the ejector rod, and a trigger is fixedly arranged at the outer end of the ejector rod through a trigger pin; the rear end of the head of the wrench body is provided with a hook in a clamping way.

Compared with the prior art, the utility model discloses a pneumatic spanner is equipped with no round pin hammering group at the front end of cylinder, and no round pin hammering group is beaten room, impact bar, hammer and is beaten piece and hammer and beat the room gasket and constitute by hammering. The hammering chamber is not connected with the hammering block by a connecting pin, but is connected with the hammering block by a semi-cylindrical pushing block integrally formed on the inner cavity wall of the hammering chamber, and a semi-cylindrical pushing groove matched with the semi-cylindrical pushing block is formed on the hammering block. The utility model discloses be equipped with on the inner wall of piece is beaten to the hammer and strike the convex body, the last shaping of impact bar has the face of beating, and when the cylinder drove the hammering room and rotate, the hammering room can drive the hammering piece through semi-cylindrical ejector pad and rotate together, and the hammering piece strikes the face of beating through hitting convex body intermittent type nature at rotatory in-process, makes the rotatory output torsion of impact bar. The utility model discloses a face and striking convex body all set up in the relative sealed hammering chamber, therefore the security is higher relatively, can not be cracked because of the face accident, and damage other parts.

Drawings

FIG. 1 is a schematic structural view of the invention;

FIG. 2 is a schematic view of the air intake and exhaust of the present invention;

FIG. 3 is a schematic view of the structure in the direction A of FIG. 2;

FIG. 4 is a schematic view of the structure in the direction B of FIG. 2;

fig. 5 is an exploded view of the present invention;

fig. 6 is a schematic perspective view of the wrench body of the present invention;

fig. 7 is a schematic perspective view of the impact bar of the present invention;

fig. 8 is a schematic perspective view of the hammering block of the present invention;

FIG. 9 is a schematic structural view of the pin-less hammering set of the present invention;

FIG. 10 is a sectional view in the direction I-I of FIG. 9;

FIG. 11 is a cross-sectional view of the hammering chamber of the present invention;

fig. 12 is a schematic perspective view of the switching valve body of the present invention.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 12 are schematic structural views of the present invention.

Wherein the reference numerals are: <xnotran> D, F, G, K, L1, L2, Q, T, X, Z, 1, 11, 11a, 12, 12a, 12b, 12c, 2, 21, 211, 212, 22, 3, 31, 32, 33, 34, 35, 4, 41, 42, 43, 44, 5, 51, 51a, 511, 52, 53, 54, 55, 56, 57, 6, 6a, 61, 61a, 611, 62, 62a, 62b, 621, 63, 63a, 631, 64, O 65, C 66, 7, 8, 81, 82, 9, 91, 92, 93. </xnotran>

As shown in fig. 1 to 12, the utility model discloses a pneumatic wrench with a pin-less striking mechanism, which comprises a wrench body 1, wherein the wrench body 1 is composed of a head 11 and a handle 12 integrally connected below the head. The handle 12 has mounted therein the opening and closing valve assembly 2, the reversing lever assembly 3, and the opening and closing assembly 4. The head 11 of the wrench body 1 is formed with a cylinder chamber 11a, the cylinder chamber 11a has a front opening, and the cylinder 5 is positioned in the cylinder chamber 11 a. The utility model discloses the front end of cylinder 5 is provided with no round pin and beats group 6, and no round pin is beaten group 6 and is beaten room 61, impact bar 62, the piece 63 and the room gasket 64 of beating by the hammer and constitute. The rear end of the hammering chamber 61 is drivingly connected to the rotor 51 of the cylinder 5. As can be seen from fig. 9, the hammering chamber gasket 64 is sealed in the opening of the hammering chamber 61, so that the inner cavity of the hammering chamber 61 forms a relatively sealed hammering chamber 6a. The impact rod 62 is processed into a hammering section 621 from the middle to the back, the hammering section 621 of the impact rod 62 penetrates through the hammering chamber gasket 64 in a rotating manner and extends into the hammering cavity 6a, and two hammering blocks 63 are arranged and are positioned in the hammering cavity 6a and are sequentially sleeved on the hammering section 621 of the impact rod 62. The hammering chamber and the hammering block of the traditional pneumatic wrench are connected by a connecting pin, and the connecting method is complex in assembly and requires a plurality of parts to be matched. The utility model discloses the shaping has semi-cylindrical ejector pad 611 on the inner chamber wall of hammering chamber 61, and the shaping has semi-cylindrical push away groove 63a on the outer peripheral face of hammering piece 63, and semi-cylindrical push away groove 63a and semi-cylindrical ejector pad 611 looks adaptation make semi-cylindrical ejector pad 611 can block into semi-cylindrical push away groove 63a to make hammering chamber 61 can utilize semi-cylindrical ejector pad 611 to drive the rotation of hammering piece 63. The utility model discloses utilize semi-cylindrical ejector pad 611 to connect and beat piece 63 with the hammer, its connection structure is simple high-efficient, and it is also very convenient to install. As shown in fig. 7, the hammering section 621 of the impact rod 62 is formed with two striking surfaces 62a arranged in front and back, one striking surface 62a of the two striking surfaces 62a is a clockwise striking surface, and the other striking surface 62a of the two striking surfaces 62a is an anticlockwise striking surface. Each of the two striking surfaces 62a corresponds to one of the hammer blocks 63. As can be seen from fig. 8 and 10, the striking protrusions 631 are disposed on the inner wall of the striking block 63, and when the striking chamber 61 drives the striking block 63 to rotate, the striking protrusions 631 intermittently strike the striking surface 62a during the rotation of the striking block 63, so that the striking rod 62 rotates to output a torque. The utility model discloses striking face 62a and the hammer of impact bar 62 are beaten piece 63 and are all located relative sealed hammer and beat chamber 6a, if striking face 62a is broken like this, also can control in hammer and beat chamber 6a to improve the security that whole air spanner used. The hammering chamber 61 is also provided with a front protecting cover 7, and the front protecting cover 7 is hermetically matched with the front opening of the cylinder chamber 11 a. The front section of the impact lever 62 passes through the front cover 7 in a rotatably supported manner, a rotating shaft hole 62b is formed in the rear end surface of the impact lever 62 along the axial center, and a front shaft section 511 extending into the rotating shaft hole 62b is formed in the front end of the rotor 51. The front shaft segment 511 extends into the rotary shaft hole 62b for rotatably supporting the striking rod 62. The impact rod 62 is supported by the rotation of the front protective cover 7 and the front shaft section 511, so that the stability of the rotation of the impact rod 62 can be ensured.

In the embodiment, the utility model discloses a rear end shaping of hammering room 61 has splined hole 61a, and processing has the spline key rack 51a that is used for being connected the assembly with splined hole 61a spline on the outer peripheral face of rotor 51 front end. The hammering chamber 61 is connected with the rotor 51 through splines, and maintenance and replacement are convenient.

In the embodiment, the utility model discloses a shaping threaded hole on the preceding protecting cover 7, the 11 shaping of head of spanner body 1 have the bolt through-hole, and the bolt through-hole that preceding protecting cover 7 passed 1 head 11 of spanner body through four stay bolts L1 cooperatees with the screw hole spiral of preceding protecting cover 7, joins in marriage preceding protecting cover 7 and cylinder chamber 11a stationary phase and joins in marriage the dress. In order to prevent external water from entering the cylinder chamber 11a, a gasket D for sealing is pressed between the front protecting cover 7 and the front opening of the cylinder chamber 11 a. For better rotation support impact rod 62, the front end shaping of front protecting cover 7 has the dead eye, and the location is installed oiliness axle sleeve T in the dead eye, and impact rod 62 and oiliness axle sleeve T rotate to wear to establish cooperatees. The front protecting cover 7 is provided with an oil filling nozzle Z which is used for filling a proper amount of lubricating oil so as to ensure the flexibility of internal operation parts. An adjusting O-shaped ring 65 and a C-shaped retaining ring 66 are arranged in the annular groove at the front end of the impact rod 62.

In the embodiment shown in fig. 1 and 5, the cylinder 5 of the present invention is composed of a cylinder body, a rotor 51 and a blade 52. The cylinder block is composed of a cylinder 53, a front end plate 54 mounted on the front end of the cylinder 53, and a rear end plate 55 mounted on the rear end of the cylinder 53. The cylinder 53, the front end plate 54 and the rear end plate 55 are fixedly connected to each other by a round head screw L2. Roller bearings 56 for rotatably supporting the rotor 51 are mounted on both the front end plate 54 and the rear end plate 55, and the rotor 51 is fitted with the inner circle of the roller bearings 56. The blades 52 are snap fitted to the rotor 51. The cylinder 53 is formed with an exhaust port and an intake port, and the intake port is fitted with an intake port seal 57. When high-pressure gas enters the cylinder body through the gas inlet, the high-pressure gas acts on the blades 52, so that the blades 52 generate torque to drive the rotor 51 to rotate, and the high-pressure gas after doing work is converted into low-pressure gas to be discharged through the gas outlet.

As shown in fig. 6, the upper end of the handle 12 of the wrench body 1 of the present invention is formed with a reversing lever assembling cavity 12a for mounting the reversing lever assembly 3, and the reversing lever assembly 3 is composed of a reversing lever 31, a reversing sleeve 32 and a reversing shift lever 33. The reversing lever 31 is disposed in the reversing lever fitting chamber 12a and can be rotated clockwise and counterclockwise by a certain angle. The reversing rod 31 is sleeved with a reversing rod sealing ring 34 which is matched with the opening of the reversing rod assembly cavity 12a in a sealing way. The reversing sleeve 32 is positioned and sleeved at the outer end of the reversing rod 31, and the reversing deflector rod 33 is sleeved on the reversing sleeve 32 and locked and fixed by the cylindrical pin 35. The reversing lever 33 is used for manually shifting the reversing sleeve 32, the reversing lever 31 is driven to rotate clockwise or counterclockwise by the reversing sleeve 32, the air inlet direction of the air cylinder 5 is changed by the reversing lever 31 through clockwise or counterclockwise rotation, so that the rotation direction of the rotor 51 is controlled,

in the embodiment, the reversing sleeve 3 of the utility model is provided with a positioning device 8; the positioning device 8 is used for positioning the reversing rod 31 after the reversing rod 31 rotates and reverses to the proper position, so that the reversing rod 31 is prevented from automatically rotating during the use process of the wrench. The positioning device 8 of the utility model is composed of a positioning steel ball 81 and a positioning spring 82; the positioning spring 82 is pressed in a positioning hole formed in the reversing sleeve 32 through a positioning steel ball 81, and the positioning steel ball 81 is matched with a positioning channel formed in the reversing rod assembly cavity 12a in a rolling and abutting mode. The positioning spring 82 is used to apply a pre-tightening pressure to the positioning steel ball 81.

In the embodiment, as shown in fig. 2, an air inlet channel 12b and an air outlet channel 12c are formed in the handle 12 of the wrench body 1, the upper end of the air inlet channel 12b is communicated with the bottom of the reversing lever assembly cavity 12a, and the upper end of the air outlet channel 12c is communicated with the middle of the reversing lever assembly cavity 12 a; an exhaust hole communicated with the reversing rod assembly cavity 12a, a left air inlet hole and a right air inlet hole are formed in the wrench body 1, the left air inlet hole is communicated with a left air inlet of the cylinder body 5, the right air inlet hole is communicated with a right air inlet of the cylinder body 5, and the exhaust hole is communicated with an exhaust port of the cylinder body 5. An annular exhaust gap X is formed between the outer peripheral surface of the reversing lever 31 and the inner wall of the reversing lever fitting chamber 12a, and the exhaust gap X is used for communicating the exhaust passage 12c with the exhaust hole. The reversing lever 31 is further formed with a middle hole K, and the middle hole K can communicate the air inlet channel 12b with the left air inlet hole or communicate the air inlet channel 12b with the right air inlet hole through rotation. The middle hole channel K is composed of a part of the central through hole of the reversing rod 31 and a radial inclined hole communicated with the central through hole.

In the embodiment, an air inlet joint 9 which is conveniently connected with an air source is arranged in a channel opening of the air inlet channel 12b in an anti-falling clamping mode through an elastic cylindrical pin 91, a joint gasket 92 is arranged on the air inlet joint 9 in a cushioning mode, and three joint sealing rings 93 which have a sealing function are sleeved on the air inlet joint 9; a muffler Q is mounted in the mouth of the exhaust passage 12 c.

In the embodiment, as shown in fig. 1, a step surface is formed in the air inlet passage 12b, and a framework oil seal F is hermetically arranged on the step surface; the opening/closing valve assembly 2 includes an opening/closing valve body 21 and an opening/closing valve spring 22. The on-off valve body 21 is composed of a valve rod 211 and a valve seat 212, the valve rod 211 slidably penetrates through the framework oil seal F and extends into the cavity bottom of the reversing rod assembly cavity 12a, the valve seat 212 is in sealing abutting joint with the framework oil seal F to form a throat for controlling on-off of air inlet, the upper end of an on-off valve spring 22 abuts against the valve seat 212, and the lower end of the on-off valve spring 22 abuts against the air inlet connector 9.

As shown in fig. 1, the switch assembly 4 is composed of a push rod 41 and a trigger 42; the push rod 41 passes through the reversing sleeve 32 and the reversing rod 31 in sequence in a sliding manner to be abutted against the upper end of the valve rod 211 of the switching valve body 21, a push rod sealing ring 43 for preventing air leakage is sleeved on the push rod 41, and a trigger 42 is fixedly arranged at the outer end of the push rod 41 through a trigger pin 44; the rear end of the head 11 of the wrench body 1 is engaged with a hook G.

As shown in fig. 2, the working principle of the present invention is: high-pressure gas enters the gas inlet channel 12b through the gas inlet connector 9, the trigger 42 is pressed down, the trigger 42 pushes the opening and closing valve component 2 through the ejector rod 41 to open a gas inlet throat, and the high-pressure gas enters the middle duct K through the throat. There are two cases at this time:

1. if the reversing lever 33 drives the reversing lever 31 to rotate counterclockwise (looking at B in fig. 2), high-pressure gas enters the left air inlet of the cylinder 5 through the middle hole K and the left air inlet of the wrench body 1, the high-pressure gas pushes the rotor 51 to rotate counterclockwise (looking at a in fig. 2), the rotor 51 drives the hammering chamber 61, and the hammering block 63 intermittently impacts the striking surface 62a to drive the impact rod 62 to rotate.

2. If the reversing lever 31 is driven to rotate clockwise by the reversing lever 33 (see B in fig. 2), high-pressure gas enters the right air inlet of the cylinder 5 through the middle hole K and the right air inlet of the wrench body 1, the high-pressure gas pushes the rotor 51 to rotate clockwise (see a in fig. 2), the rotor 51 drives the hammering chamber 61, and the hammering block 63 intermittently impacts the striking surface 62a to drive the impact rod 62 to rotate.

The utility model discloses a spanner body 1 is by plastics injection moulding, and light in weight, machining are few to there is certain shock attenuation effect.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. A pneumatic wrench of a pin-free striking mechanism comprises a wrench body (1) with a handle part (12) provided with an opening and closing valve assembly (2), a reversing rod assembly (3) and a switch assembly (4), wherein a cylinder chamber (11 a) with a front opening is formed at the head part (11) of the wrench body (1), and a cylinder (5) is positioned and installed in the cylinder chamber (11 a); the method is characterized in that: a pin-free hammering group (6) is arranged at the front end of the cylinder (5); the pin-free hammering group (6) consists of a hammering chamber (61), an impact rod (62), a hammering block (63) and a hammering chamber gasket (64); the rear end of the hammering chamber (61) is in driving connection with a rotor (51) of the cylinder (5), a hammering chamber gasket (64) and a cavity opening of the hammering chamber (61) are sealed and matched to form a relatively sealed hammering cavity (6 a), a hammering section (621) of the impact rod (62) rotatably penetrates through the hammering chamber gasket (64) and extends into the hammering cavity (6 a), and the hammering block (63) is sleeved on the hammering section (621) of the impact rod (62); a semi-cylindrical push block (611) for driving the hammering block (63) to rotate is formed on the inner cavity wall of the hammering chamber (61), a hammering face (62 a) is formed on a hammering section (621) of the impact rod (62), a hammering convex body (631) is arranged on the inner wall of the hammering block (63), and the hammering convex body (631) intermittently drives the impact rod (62) to rotate through impacting the hammering face (62 a) in the rotating process of the hammering block (63); the pneumatic hammer is characterized in that the cylinder chamber (11 a) is provided with a front protective cover (7) used for covering and protecting the hammering chamber (61), the front section of the impact rod (62) penetrates through the front protective cover (7) in a rotating supporting mode, a rotating shaft hole (62 b) is machined in the rear end face of the impact rod (62) along the axis, and a front shaft section (511) extending into the rotating shaft hole (62 b) and used for rotatably supporting the impact rod (62) is formed in the front end of the rotor (51).

2. The pinless striking mechanism air wrench of claim 1, wherein: a spline hole (61 a) is formed at the rear end of the hammering chamber (61), and a spline rack (51 a) for spline connection assembly with the spline hole (61 a) is processed on the peripheral surface of the rotor (51); a semi-cylindrical push groove (63 a) matched with the semi-cylindrical push block (611) of the hammering chamber (61) is formed on the outer peripheral surface of the hammering block (63).

3. The pinless striking mechanism air wrench of claim 2, wherein: the front protecting cover (7) is fixedly assembled with the cylinder chamber (11 a) through four long bolts (L1), and a sealing gasket (D) with a sealing function is pressed between the front protecting cover (7) and the front opening of the cylinder chamber (11 a); a bearing hole is formed at the front end of the front protecting cover (7), an oil-containing shaft sleeve (T) is positioned and installed in the bearing hole, and the impact rod (62) is rotatably penetrated and matched with the oil-containing shaft sleeve (T); the front protecting cover (7) is provided with a lubricating nozzle (Z), and an adjusting O-shaped ring (65) and a C-shaped retaining ring (66) are arranged in an annular groove at the front end of the impact rod (62).

4. The pinless striking mechanism air wrench of claim 3, wherein: the cylinder (5) consists of a cylinder body, the rotor (51) and blades (52); the cylinder body consists of a cylinder barrel (53), a front end plate (54) arranged at the front end of the cylinder barrel (53) and a rear end plate (55) arranged at the rear end of the cylinder barrel (53); the cylinder barrel (53), the front end plate (54) and the rear end plate (55) are fixedly connected into a whole by round head screws (L2); the front end plate (54) and the rear end plate (55) are respectively provided with a roller bearing (56) for rotatably supporting the rotor (51), the rotor (51) is sleeved and matched with the inner circle of the roller bearing (56), and the blade (52) is clamped on the rotor (51);

the cylinder barrel (53) is formed with an exhaust port and an air inlet, and the air inlet is provided with an air inlet sealing ring (57).

5. The pinless striking mechanism air wrench of claim 4 wherein: a reversing rod assembly cavity (12 a) for mounting a reversing rod assembly (3) is formed at the upper end of a handle (12) of the wrench body (1), and the reversing rod assembly (3) consists of a reversing rod (31), a reversing sleeve (32) and a reversing deflector rod (33); the reversing rod (31) is rotatably arranged in the reversing rod assembly cavity (12 a), and a reversing rod sealing ring (34) which is matched with the cavity opening of the reversing rod assembly cavity (12 a) in a sealing way is sleeved on the reversing rod (31); the reversing sleeve (32) is positioned and sleeved at the outer end of the reversing rod (31), the reversing deflector rod (33) is locked and sleeved on the reversing sleeve (32) through a cylindrical pin (35), and the reversing deflector rod (33) drives the reversing rod (31) to rotate through the forward and reverse shifting reversing sleeve (32) to change the air inlet direction of the air cylinder (5).

6. The pinless striking mechanism air wrench of claim 5, wherein: the reversing sleeve (32) is provided with a positioning device (8) which is used for positioning the reversing rod (31) after the reversing rod (31) rotates and reverses to the position; the positioning device (8) consists of a positioning steel ball (81) and a positioning spring (82); the positioning spring (82) is pressed in a positioning hole formed in the reversing sleeve (32) through a positioning steel ball (81), and the positioning steel ball (81) is matched with a positioning channel formed in the reversing rod assembly cavity (12 a) in a rolling and abutting-contacting manner.

7. The pinless striking mechanism air wrench of claim 6, wherein: an air inlet channel (12 b) and an air outlet channel (12 c) are formed in the handle part (12) of the wrench body (1), the upper end of the air inlet channel (12 b) is communicated with the bottom of the reversing rod assembly cavity (12 a), and the upper end of the air outlet channel (12 c) is communicated with the middle of the reversing rod assembly cavity (12 a); the wrench body (1) in the shaping have exhaust hole and the inlet port of intercommunication reversing bar assembly chamber (12 a), reversing bar (31) cooperate with reversing bar assembly chamber (12 a) to be formed with and be used for communicating exhaust gap (X) in exhaust passage (12 c) and exhaust hole, the shaping has middle pore (K) that is used for communicating inlet port and inlet channel (12 b) on this reversing bar (31).

8. The pinless striking mechanism air wrench of claim 7, wherein: an air inlet joint (9) which is convenient to be connected with an air source is arranged in the opening of the air inlet channel (12 b) in an anti-falling clamping mode through an elastic cylindrical pin (91), a joint gasket (92) is arranged on the air inlet joint (9) in a cushioning mode, and three joint sealing rings (93) playing a role in sealing are sleeved on the air inlet joint (9); and a silencer (Q) is arranged in the opening of the exhaust passage (12 c).

9. The pinless striking mechanism air wrench of claim 8, wherein: a step surface is formed in the air inlet channel (12 b), and a framework oil seal (F) is hermetically arranged on the step surface; the opening and closing valve assembly (2) comprises an opening and closing valve body (21) and an opening and closing valve spring (22); the switching valve body (21) consists of a valve rod (211) and a valve seat (212), the valve rod (211) penetrates through a framework oil seal (F) in a sliding mode and extends into the bottom of a cavity of the reversing rod assembly cavity (12 a), the valve seat (212) is in sealed abutting joint with the framework oil seal (F) to form a throat opening for controlling air inlet on-off, the upper end of the on-off valve spring (22) is abutted to the valve seat (212), and the lower end of the on-off valve spring (22) is abutted to the air inlet connector (9).

10. The pinless striking mechanism air wrench of claim 9, wherein: the switch assembly (4) consists of a mandril (41) and a trigger (42); the push rod (41) penetrates through the reversing sleeve (32) and the reversing rod (31) in sequence in a sliding manner to be abutted with the upper end of the valve rod (211) of the opening-closing valve body (21), a push rod sealing ring (43) for preventing air leakage is sleeved on the push rod (41), and the trigger (42) is fixedly arranged at the outer end of the push rod (41) through a trigger pin (44); the rear end of the head (11) of the wrench body (1) is provided with a hook (G) in a clamping manner.

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