KR102830750B1 - Safety device for quick coupler - Google Patents

Abstract

The present invention relates to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, which detects changes in the tension of first and second compression springs so as to detect the engagement state of a first attachment pin and a quick coupler movable hook and the engagement state of a second attachment pin and a fixed hook by first and second detection units, thereby quickly detecting separation of a first attachment pin and a movable hook and separation of a second attachment pin and a fixed hook, and which accurately measures the tension displacement of a compression spring regardless of shock transmitted during crushing work at a construction site or the scattering of foreign substances such as dust, and which has an improved structure so as to quickly notify a worker of the detected information.
In addition, the present invention relates to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, in which a first proximity sensor is arranged vertically with respect to a pin engaging groove of a movable hook and a second proximity sensor is arranged horizontally with respect to a pin engaging groove of a fixed hook so as to detect a release of engaging states of the first and second attachment pins at a position close to engaging portions of the first and second attachment pins, in addition to measuring a tension displacement of a compression spring, and in which the structure thereof is improved so as to minimize spatial interference.

Description

Sliding quick coupler with pressure sensor for detecting spring tension {SAFETY DEVICE FOR QUICK COUPLER}

The present invention relates to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, and more particularly, to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, the structure of which is improved so as to detect a change in tension of a first compression spring that supports a movable hook to prevent separation of the movable hook by compressive elastic force, thereby quickly detecting separation of a first attachment pin and a movable hook, and at the same time detect a change in tension of a second compression spring that prevents rearward sliding of a safety block that prevents separation of the fixed hook, thereby quickly detecting separation of the fixed hook and a second attachment.

In addition, the present invention relates to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, the structure of which is improved so that the tension displacement of the first and second compression springs can be accurately measured regardless of shock transmitted during crushing work at a construction site or foreign substances such as dust flying, and the detected information can be quickly notified to the worker.

In addition, the present invention relates to a sliding quick coupler equipped with a pressure sensor for detecting spring tension, which is arranged vertically with respect to the pin engaging groove of the movable hook and horizontally with respect to the pin engaging groove of the fixed hook so as to detect the release of engaging states of the first and second attachment pins in addition to measuring the tension displacement of the first and second compression springs, and which is capable of detecting the engaging states of the first and second attachment pins at a position close to the engaging portions of the first and second attachment pins, and whose structure is improved to minimize spatial interference.

In general, heavy equipment used at construction sites or civil engineering sites, such as excavators, are construction equipment widely used in road construction, water supply and sewage construction, building foundation construction, land development construction, and earth and sand extraction construction, and various attachments are selectively installed to perform the work depending on the purpose of the work.

For example, it is designed to perform various tasks by replacing various types of attachments depending on the purpose, such as digging the ground with a bucket, breaking up concrete buildings and cutting rebar with a crusher, destroying rocks and concrete with a breaker, transporting scrap metal and rocks with a grab, and constructing vertical shafts and water supply and sewerage foundations with a clamshell bucket.

Usually, attachments are combined in a structure that can be mounted and removed from the excavator arm so that they can be replaced depending on the purpose of the work. Recently, a quick coupler that can easily connect attachments by mounting a separate coupler on the excavator arm has been developed and is being widely used.

These quick couplers are rigidly mounted to the excavator arm and cylinder-side push link through two pin-joining structures on the quick coupler body, and are structured to allow attachments to be fastened using movable hooks and fixed hooks.

Accordingly, the excavator driver can easily handle and use the attachment by operating a lever to connect or disconnect the quick coupler mounted on the tip of the arm to a bucket or breaker, etc.

Meanwhile, to prevent the risk of the attachment being separated due to a failure of the hydraulic cylinder in the quick coupler or damage to the hydraulic hose during operation, a safety device, such as a safety pin, is installed in the quick coupler to prepare for safety accidents.

However, when replacing attachments such as buckets or breakers in a quick coupler, the worker must manually detach the safety pin from the existing attachment or attach the safety pin after installing the new attachment, which is not only difficult and cumbersome, but also takes a lot of time.

In addition, if the pin that connects the movable hook and fixed hook of the quick coupler is detached, there is a risk of a safety accident occurring to workers working below as the attachment is separated from the quick coupler and falls downward.

As a prior art to prevent this, as disclosed in Korean Patent Publication No. 10-1665663, “Dual Safety Device of Quick Coupler” (Registration Date: 2016.10.06), previously filed by the same applicant, automatically prevents arbitrary separation between an attachment pin and a fixed hook during the connection process of a quick coupler for connecting an attachment for heavy equipment and an excavator, and automatically enables the operation of a locking device by linking the operation of a cylinder that slides the hitch and the elasticity of the first and second compression springs. However, there is a disadvantage in that a separate detection unit is not provided to detect the release state of the locking device due to oil leakage or rupture of the compression spring.

Another prior art to improve this is disclosed in Korean Patent Publication No. 10-2226956, "Automatic coupling device for hydraulic quick coupler between heavy equipment or industrial machinery and work device" (Registration date: 2021.03.06), which automatically connects the hydraulic line and the power line when coupling the heavy equipment or industrial machinery and the work device, so that the driver does not have to manually connect them, and through the detection sensor unit and the coupling detection sensor unit coupled to the connector, whether the connection port and the insertion part and the coupling of the fastening part and the fixing part are normally coupled is detected and displayed through the control unit, so that the driver can easily check whether the coupling is normal.

In the above case, the normal bonding state can be confirmed using the above bonding detection sensor unit, but there is a risk that the sensor can be easily damaged due to the situation at the work site where external impact is easily transmitted, and there is a disadvantage in that accurate detection is difficult due to environmental restrictions where foreign substances such as dust float at the work site.

Korean Patent Publication No. 10-1665663 "Dual Safety Device of Quick Coupler" (Registration Date: 2016.10.06) Korean Patent Publication No. 10-2226956 "Automatic coupling device for hydraulic quick coupler of heavy equipment or industrial machinery and work device" (Registration date: 2021.03.06)

The present invention has been created to solve the above-mentioned problems in consideration of the above-mentioned various problems, and its purpose is to provide a sliding quick coupler equipped with a pressure sensor for detecting spring tension, the structure of which is improved so as to detect a change in tension of a first compression spring that supports the movable hook to prevent separation by compressive elastic force, thereby quickly detecting separation of a first attachment pin and a movable hook, and at the same time detect a change in tension of a second compression spring that prevents rearward movement of a safety block that prevents separation of the fixed hook, thereby quickly detecting separation of the fixed hook and the second attachment.

Another object of the present invention is to provide a sliding quick coupler equipped with a pressure sensor for detecting spring tension whose structure is improved so that the tension displacement of the first and second compression springs can be accurately measured regardless of shock transmitted during crushing work at a construction site or foreign matter such as dust flying, and so that the detected information can be quickly reported to the worker.

Another object of the present invention is to provide a sliding quick coupler equipped with a pressure sensor for detecting spring tension, which is arranged vertically with respect to the pin engaging groove of the movable hook and horizontally with respect to the pin engaging groove of the fixed hook so as to detect the disengagement of the engaging states of the first and second attachment pins in proximity to the engaging portions of the first and second attachment pins in addition to measuring the tension displacement of the first and second compression springs, and which is capable of detecting the engaging states of the first and second attachment pins at a position close to the engaging portions of the first and second attachment pins, and which has an improved structure so as to minimize spatial interference.

In order to achieve the above object, the present invention comprises: a movable hook provided on a quick coupler body and connected to a load member of a cylinder to rotate and engage with a first attachment pin when the load member moves forward; a fixed hook provided on the quick coupler body and engages with a second attachment pin; a first compression spring coupled to an outer side of the load member of the cylinder and providing a compressive elastic force toward the movable hook to suppress a backward movement of the load member; a second compression spring disposed between the other side of the cylinder body of the cylinder and a safety block and providing a compressive elastic force toward the safety block to suppress a backward movement of the safety block; A safety block which is moved to be positioned above a second attachment pin located at the front side by the compressive elastic force of the second compression spring while in contact with the second compression spring, and prevents the second attachment pin from being detached from the fixing hook when the fixing hook and the second attachment pin are normally engaged, and can move toward the cylinder body located at the rear side when the second compression spring is broken; a first detection unit which is coupled to support one end of the first compression spring, has at least one pressure sensor provided to measure tension displacement of the first compression spring, and outputs the measured tension displacement information of the first compression spring to the control unit; a second detection unit which is coupled to support the rear end of the second compression spring, has at least one pressure sensor provided to measure tension displacement of the second compression spring, and outputs the measured tension displacement information of the second compression spring to the control unit; And, when information measured from the first and second detection units is applied to the control unit, a notification unit is provided that notifies the outside of the detachment status of the first and second attachment pins by a control signal output from the control unit.

The above first sensing unit comprises a first contact plate coupled so that one end of the first compression spring comes into contact and the load member penetrates therethrough, a second contact plate in the form of a plate that is arranged close to the first contact plate and is supported by the cylinder and is symmetrical to the first contact plate, and at least one pressure sensor that is arranged between the first and second contact plates and outputs tension displacement information of the first compression spring that comes into contact with the first contact plate as an electrical signal to the control unit.

The second sensing unit comprises a third contact plate with which the rear end of the second compression spring comes into contact, a fourth contact plate which is positioned close to the third contact plate and is supported by the cylinder body and has a shape symmetrical to the third contact plate, and at least one pressure sensor which is positioned between the third and fourth contact plates and outputs tension displacement information of the second compression spring in contact with the third contact plate as an electrical signal to the control unit.

The first and second sensing portions are each provided with a stepped portion formed in a groove shape in a downward direction on the upper surfaces of the first and second contact plates that contact each other and the upper surfaces of the third and fourth contact plates that contact each other, and a filler that is filled and hardened in the stepped portion to fix and cushion the harness wiring so that the harness wiring of the pressure sensor passes through it.

The above filler is epoxy resin.

The above first and second detection units further include a first proximity sensor that is arranged vertically with respect to the pin coupling groove of the movable hook and detects the coupling state of the first attachment pin and the movable hook, and a second proximity sensor that is arranged horizontally with respect to the pin coupling groove of the fixed hook and detects the coupling state of the second attachment pin and the fixed hook.

The above-mentioned notification unit is a warning light or alarm device that is placed on the excavator arm and the excavator cabin, respectively, and illuminates when a control signal from the control unit is applied.

The present invention is a device that prevents the rearward sliding of a safety block (150) that locks the combination of a fixed hook (120) and a second attachment pin (20) when a break occurs in a first compression spring (310) that supports the combination of a movable hook (110) and a first attachment pin (10) and when a tension displacement occurs in the first compression spring (310) due to a backward movement of the movable hook (110), or when a pressure sensor (430) of a detection unit detects the tension displacement of the first compression spring (310) and transmits the detected information to a control unit (600), and when a break occurs in a second compression spring (320) that prevents the rearward sliding of a safety block (150) that locks the combination of a fixed hook (120) and a second attachment pin (20), and when a tension displacement occurs in the second compression spring (320) due to a backward movement of the safety block (150). In this case, the control unit (600) outputs a control signal to operate the notification unit (500), thereby informing workers at the work site and the excavator operator of the abnormal state of the cylinder (200) and the first and second compression springs (310, 320) externally, thereby having the useful advantage of preventing safety accidents.

In addition, since the present invention comprises a plurality of pressure sensors (430) interposed between the first and second contact plates (410, 420) and the first and second sensing units (400A, 400B) and a filler (440) protecting the harness wiring (432) of the pressure sensors (430), sufficient rigidity can be achieved against external impact, and the advantage of improving the durability of the parts by protecting the vulnerable parts of the harness wiring (432) with the filler (440) is provided.

In addition, the present invention has the advantage of being able to quickly and accurately measure whether there is an abnormality in the first and second compression springs (310, 320) and the cylinder (200) by using the first and second proximity sensors (510, 520) in parallel with the pressure sensor (430).

Figure 1 is a configuration diagram showing the configuration of a sliding quick coupler equipped with a pressure sensor for detecting spring tension according to the present invention.
Figure 2 is a drawing showing the fastening state of the movable hook and the first attachment pin during the forward movement of the movable hook of the present invention.
Figure 3 is a perspective view showing the combined state of the first and second compression springs and the first and second sensing units of the present invention.
Figure 4 is a cross-sectional view showing the first and second detection units of the present invention.
Figure 5 is a perspective view showing the first and second detection units of the present invention.
Figure 6 is a diagram showing an excavator equipped with a sliding quick coupler equipped with a pressure sensor for detecting spring tension of the present invention.

Hereinafter, a sliding quick coupler equipped with a pressure sensor for detecting spring tension according to the present invention will be described in more detail through detailed descriptions of embodiments with reference to the drawings.

In describing the present invention, if it is judged that a specific description of a related known technology or configuration may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of their functions in the present invention and may vary depending on the user's intention or custom, etc. Therefore, the definitions should be made based on the contents throughout this specification. In addition, 'including' a certain component does not mean excluding other components unless specifically stated otherwise, but rather that other components may be included.

The sliding quick coupler equipped with a pressure sensor for detecting spring tension according to the present invention will be described with reference to FIGS. 1 to 6, including: a movable hook (110) provided on a quick coupler body (100) and connected to a load member (220) of a cylinder (200) to rotate and engage with a first attachment pin (10) when the load member (220) moves forward; a fixed hook (120) provided on the quick coupler body (100) and engage with a second attachment pin (20); a first compression spring (310) coupled to the outside of the load member (220) of the cylinder (200) and providing a compressive elastic force toward the movable hook (110) to suppress a backward movement of the load member (220); A second compression spring (320) arranged between the other side of the cylinder body (210) of the cylinder (200) and the safety block (150) and providing a compressive elastic force toward the safety block (150) to suppress backward movement of the safety block (150); a safety block (150) which is moved to be located above the second attachment pin (20) located at the front side by the compressive elastic force of the second compression spring (320) while in contact with the second compression spring (320), thereby preventing the second attachment pin (20) from being detached from the fixed hook (120) when the fixed hook (120) and the second attachment pin are normally engaged, and which can move toward the cylinder body (210) located at the rear side when the second compression spring (320) is broken; A first detection unit (400A) coupled to support one end of the first compression spring (310), and provided with at least one pressure sensor (430) to measure tension displacement of the first compression spring (310), and outputting measured tension displacement information of the first compression spring (310) to the control unit (600); A second detection unit (400B) coupled to support the rear end of the second compression spring (320), and provided with at least one pressure sensor (430) to measure tension displacement of the second compression spring (320), and outputting measured tension displacement information of the second compression spring (320) to the control unit (600); And, when the information measured from the first and second detection units (400A, 400B) is applied to the control unit (600), it comprises a notification unit (500) that notifies the outside of the pin detachment state by a control signal output from the control unit (600).

Referring to FIGS. 1 and 2, the quick coupler body (100) has front and rear side plates spaced apart from each other in the front and rear directions via fixed pins, and a cylinder (200) that rotates a movable hook (110) is placed between the front and rear side plates.

The above cylinder (200) is composed of a cylinder body (210) that is rotatably connected to a quick coupler body (100) by a connecting pin as shown in FIGS. 1 and 3, and a rod member (220) that is elastically connected to an end of a movable hook (110) and has a rotatably connected motion according to the supply direction of hydraulic pressure supplied into the cylinder body (210).

As shown in FIGS. 1 and 2, the above-described movable hook (110) has a pin engaging groove formed in one direction that is open so as to be coupled with the first attachment pin (10) when rotating by the load member (220), and the above-described fixed hook (120) has a pin engaging groove formed in the other direction that is open so as to be coupled with the second attachment pin (20).

The above cylinder (200) has a structure in which the end of the load member (220) is pin-connected to rotate the movable hook (110).

As shown in FIGS. 1 and 3, the first compression spring (310) is supported by having one end contacting the movable hook (110) and the other end contacting the first contact plate (410) of the first sensing portion (400A).

In addition, the first compression spring (310) provides an elastic force to push toward the movable hook (110) when a hydraulic pressure abnormality occurs due to a leak in the cylinder (200), thereby preventing the movable hook (110) from being released from its engagement with the first attachment pin (10).

As shown in FIGS. 4 and 5, the second compression spring (320) is supported by having its front end contact the safety block (150) and its rear end contacting the third contact plate (450) of the second detection unit (400B).

The above safety block (150) is positioned above the second attachment pin (20) that is coupled to be received within the pin engaging groove of the fixed hook (120) during forward movement, thereby preventing the second attachment pin (120) from being detached from the fixed hook (120).

The above second compression spring (320) provides compression elasticity to the safety block (150) side to prevent it from being pushed in the rearward direction (toward the cylinder body (210) side).

The first detection unit (400A) as shown in FIGS. 3 and 4 comprises a first contact plate (410) coupled so that one end of the first compression spring (310) comes into contact and the load member (220) penetrates therethrough, a second contact plate (420) in the form of a plate that is positioned close to the first contact plate (410) and supported by the cylinder (200) and is symmetrical to the first contact plate (410), and at least one pressure sensor (430) that outputs tension displacement information of the first compression spring (310) that is positioned between the first and second contact plates (410, 420) and comes into contact with the first contact plate (410) as an electrical signal to the control unit (600).

In addition, the second contact plate (420) of the first sensing unit (400A) is supported so as to be fixed by one side of the cylinder body (210) of the cylinder (200).

As shown in FIGS. 3 and 4, the second detection unit (400B) comprises a third contact plate (450) with which the rear end of the second compression spring (320) comes into contact, a fourth contact plate (460) that is positioned close to the third contact plate (450) and supported by the cylinder body (210) and has a shape symmetrical to the third contact plate (450), and at least one pressure sensor (430) that outputs tension displacement information of the second compression spring (320) that is positioned between the third and fourth contact plates (450, 460) and comes into contact with the third contact plate (450) as an electrical signal to the control unit (600).

The fourth contact plate (460) of the second detection unit (400B) is supported so as to be in contact with and fixed to the other side of the cylinder body (210) of the cylinder (200).

That is, the first and second detection units (400A, 400B) are supported on one side and the other side of the fixed cylinder body (210) so as to detect the tension displacement of the first and second compression springs (310, 320) while being stably supported.

The above first and second compression springs (310, 320) may break when used for a long time, and when the first and second compression springs (310, 320) break, the tension of the first and second compression springs (310, 320) changes.

When the first compression spring (310) is broken and a leakage phenomenon occurs in the cylinder (200), the movable hook (110) moves backwards, and the engagement state between the movable hook (110) and the first attachment pin (10) may be released.

When the second compression spring (320) is broken and the safety block (150) is pushed toward the rear, the engagement between the fixed hook (120) and the second attachment pin (20) can be released.

As shown in FIGS. 4 and 5, the first and second sensing units (400A, 400B) further include a stepped portion (412, 422) formed in a groove shape on the upper surfaces of the first and second contact plates (410, 420) that contact each other and the third and fourth contact plates (450, 460) in a stepped shape downward, respectively, and a filler (440) that is filled and hardened in the stepped portion (412, 422) to fix and cushion the harness wire (432) that is connected so that the harness wire (432) of the pressure sensor (430) passes through it.

The above first and second contact plates (410, 420) and third and fourth contact plates (450, 460) are configured in the shape of square plates made of metal to have sufficient durability against impact transmitted from the outside.

The step portions (412, 422) of the first and second sensing units (400A, 400B) are formed in a single groove shape that is filled with the filler (440) in a symmetrical shape, and serve as a passage through which the harness wiring (432) of the pressure sensor (430) is led outward.

The above filler (440) is composed of epoxy resin, a material that can protect the harness wiring (432) from external impact.

That is, as shown in FIGS. 4 and 5, the filler (440) hardens while being filled in the step portion (412, 422) to prevent the harness wiring (432) connected from the pressure sensor (430) to the portion extending toward the cabin (52) from being easily damaged by external impact, thereby firmly fixing the harness wiring (432) and protecting the harness wiring (432) by cushioning it from external impact.

The above notification unit (500) is positioned on the arm of the excavator (50) and the excavator cabin (52), as shown in FIG. 6, and is equipped with a warning light (510) or an alarm device (520) that lights up when a control signal from the control unit (600) is applied.

That is, the above-mentioned notification unit (500) prevents safety accidents by arranging a warning light (510) or an alarm device (520) that sounds an alarm on the excavator arm (55) so that the field worker can recognize the release of the coupling state between the quick coupler and the first and second attachment pins (10, 20), and arranging a warning light (510) or an alarm device (520) that sounds an alarm inside the cabin (52) so that the excavator operator can recognize the release of the coupling state between the quick coupler and the first and second attachment pins (10, 20).

As shown in FIGS. 1 and 2, the first and second detection units (400A, 400B) further include a first proximity sensor (510) that is arranged vertically with respect to the pin coupling groove of the movable hook (110) to detect the coupling state of the first attachment pin (10) and the movable hook (110), and a second proximity sensor (520) that is arranged horizontally with respect to the pin coupling groove of the fixed hook (120) to detect the coupling state of the second attachment pin (20) and the fixed hook (120).

The above first and second proximity sensors (510, 520) are coupled so as to be fitted into the sensor coupling hole formed in the quick coupler body (100), and detect when the coupling state of the first attachment pin (10) coupled with the movable hook (110) and the coupling state of the second attachment pin (20) coupled with the fixed hook (120) are released, and output the detected information to the control unit (600).

The present invention having such a configuration connects a quick coupler to an end portion of an excavator arm (55) as shown in FIGS. 1 and 6, adjusts the angle of the excavator arm (55) so that the fixed hook (120) of the quick coupler is pin-coupled to a second attachment pin (20), and then the movable hook (110) is positioned close to the first attachment pin (10), and then the load member (220) of the cylinder (200) is moved forward in a forward direction (left direction in the drawing), so that, as shown in FIGS. 2 and 6, the movable hook (110) is rotated toward the first attachment pin (10) by the load member (220) and is coupled to the first attachment pin (10), thereby enabling the excavator arm (55) to be removably coupled to the attachment (A) via the quick coupler.

Thereafter, the above-mentioned movable hook (110) is coupled so as to be in close contact with the first attachment pin (10) as the elastic force of the first compression spring (310) is transmitted.

In the case of a normal quick coupler combination, as shown in Fig. 2, the load member (220) always provides a force pushing toward the movable hook (110) to maintain the combined state of the movable hook (110) and the first attachment pin (10). However, if the hydraulic pressure transmitted to the load member (220) is weakened due to a cause such as an oil leak, the combined state of the movable hook (110) and the first attachment pin (10) may be released. In this case, the movable hook (110) moves backward (to the right in the drawing) and the tension of the first compression spring (310) changes.

The pressure sensor (430) of the first detection unit (400A) converts the tension displacement (pressure detection) of the first compression spring (310) described above into an electrical signal and outputs it to the control unit (600), and the control unit (600) determines whether an abnormality exists when an electrical signal according to the tension displacement of the first compression spring (310) is applied and outputs a control signal to the notification unit (500).

At this time, since the pressure sensor (430) is arranged in multiple units between the first and second contact plates (410, 420), the pressure sensor (430) can accurately measure the tension displacement of the first compression spring (310) transmitted through one end of the first compression spring (310) that comes into contact with the first contact plate (410).

In addition, when the tension of the first compression spring (310) changes, the plurality of pressure sensors (430) output the tension displacement information of the first compression spring (310) measured to the control unit (600) through each harness wire (432).

Meanwhile, the safety block (150) is a locking device that maintains the combined state of the fixed hook and the second attachment pin, and the second compression spring (320) provides compression elasticity to the safety block (150) side to prevent the safety block (150) from being pushed to the rear.

When the second compression spring (320) is broken and the safety block (150) is pushed to the rear, the tension displacement of the second compression spring (320) occurs.

The pressure sensor of the second detection unit (400B) detects the tension displacement of the second compression spring (320) transmitted through the third contact plate (450), converts the detected tension displacement information of the second compression spring (320) into an electrical signal and outputs it to the control unit (600), and the control unit (600) determines whether an abnormality exists when an electrical signal according to the tension displacement of the second compression spring (320) is applied and outputs a control signal to the notification unit (500).

The above control unit (600) quickly determines whether there is an abnormality in the cylinder (200) based on the tension displacement information of the first compression spring (310) above, and determines whether there is an abnormality in the second compression spring (320) based on the tension displacement information of the second compression spring (320) transmitted from the second detection unit (400B) that detects the release of the engagement state between the fixed hook (120) and the second attachment pin (20). Accordingly, the control unit (600) outputs a control signal to the notification unit (500) to operate the notification unit (500) when it determines that there is an abnormality in the cylinder (200) or the second compression spring (320).

The above notification unit (500) enables the worker to quickly know if there is an abnormality and evacuate through the operation of the warning light (510) and alarm device (520) placed on the excavator arm (55) as shown in Fig. 6, and also enables the driver riding in the cabin (52) to stop work after checking for an abnormality through the operation of the warning light (510) and alarm device (520) placed on the instrument panel inside the cabin (52), thereby preventing safety accidents.

Meanwhile, the first and second proximity sensors (510, 520) assist the pressure sensor (430) to detect the engagement status of the movable hook (110) and the first attachment pin (10) and the engagement status of the fixed hook (120) and the second attachment pin (20), and output the detected information to the control unit (600), thereby enabling the first and second proximity sensors (510, 520) to quickly detect whether there is an abnormality in the cylinder (200) in parallel with the pressure sensor (430).

Accordingly, the present invention is a device that prevents the rearward sliding of the safety block (150) that locks the combination of the fixed hook (120) and the second attachment pin (20) when the first compression spring (310) that supports the combination of the movable hook (110) and the first attachment pin (10) is broken and the tension displacement of the first compression spring (310) occurs due to the backward movement of the movable hook (110), or when the pressure sensor (430) of the detection unit detects the tension displacement of the first compression spring (310) and transmits the detected information to the control unit (600). In the event of an occurrence, the control unit (600) outputs a control signal to operate the notification unit (500), thereby externally notifying workers at the work site and the excavator operator of the abnormal state of the cylinder (200) and the first and second compression springs (310, 320), thereby having the useful advantage of preventing safety accidents.

In addition, since the present invention comprises a plurality of pressure sensors (430) interposed between the first and second contact plates (410, 420) and the first and second sensing units (400A, 400B) and a filler (440) protecting the harness wiring (432) of the pressure sensors (430), sufficient rigidity can be achieved against external impact, and the advantage of improving the durability of the parts by protecting the vulnerable parts of the harness wiring (432) with the filler (440) is provided.

In addition, the present invention has the advantage of being able to quickly and accurately measure whether there is an abnormality in the first and second compression springs (310, 320) and the cylinder (200) by using the first and second proximity sensors (510, 520) in parallel with the pressure sensor (430).

In this way, although specific embodiments have been described in the detailed description of the present invention, it is obvious that various modifications are possible within a range that does not depart from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments described above, but should be determined not only by the claims described below but also by equivalents of the claims.

That is, the present invention described above is not limited to the specific preferred embodiments described above, and anyone with ordinary skill in the art to which the invention pertains can make various modifications without departing from the gist of the present invention claimed in the claims, and such modifications are within the scope of the claims.

10: 1st attachment pin 20: 2nd attachment pin
100: Quick coupler body 110: Movable hook
120 : Fixed hook 200 : Cylinder
210 : Cylinder body 220 : Cylinder rod
310: First compression spring 320: Second compression spring
400A: 1st detection unit 400B: 2nd detection unit
410: First contact plate 420: Second contact plate
412,422: Single jaw 430: Pressure sensor
432: Harness wiring 440: Filler
450: 3rd contact plate 460: 4th contact plate
510: 1st proximity sensor 520: 2nd proximity sensor
600 : Control Unit

Claims (7)

A movable hook (110) provided on a quick coupler body (100) and connected to a load member (220) of a cylinder (200) to rotate and engage with a first attachment pin (10) when the load member (220) moves forward;
A fixed hook (120) provided on the above quick coupler body (100) and coupled with a second attachment pin (20);
A first compression spring (310) coupled to the outside of the load member (220) of the cylinder (200) and providing compression elastic force toward the movable hook (110) to suppress backward movement of the load member (220);
A second compression spring (320) arranged between the other side of the cylinder body (210) of the cylinder (200) and the safety block (150) and providing compression elastic force toward the safety block (150) to suppress backward movement of the safety block (150);
A safety block (150) that is moved to be positioned above the second attachment pin (20) located at the front side by the compression elastic force of the second compression spring (320) while in contact with the second compression spring (320) to prevent the second attachment pin (20) from being detached from the fixed hook (120) when the fixed hook (120) and the second attachment pin are normally engaged, and can move toward the cylinder body (210) located at the rear side when the second compression spring (320) is broken;
A first detection unit (400A) coupled to support one end of the first compression spring (310), provided with at least one pressure sensor (430) to measure tension displacement of the first compression spring (310), and outputting measured tension displacement information of the first compression spring (310) to the control unit (600);
A second detection unit (400B) coupled to support the rear end of the second compression spring (320), at least one pressure sensor (430) provided to measure the tension displacement of the second compression spring (320), and outputting the measured tension displacement information of the second compression spring (320) to the control unit (600); and
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it comprises a notification unit (500) that notifies the outside of the detached state of the first and second attachment pins (10, 20) by a control signal output from the control unit (600) when information measured from the first and second detection units (400A, 400B) is applied to the control unit (600). In claim 1,
The above first sensing part (400A) is connected to a first contact plate (410) so that one end of the first compression spring (310) comes into contact and the load member (220) penetrates through it.
A second contact plate (420) in the form of a plate that is positioned close to the first contact plate (410) and supported by the cylinder (200) and is symmetrical to the first contact plate (410), and
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it comprises at least one pressure sensor (430) that outputs tension displacement information of a first compression spring (310) that is arranged between the first and second contact plates (410, 420) and comes into contact with the first contact plate (410) as an electrical signal to the control unit (600). In claim 1,
The above second sensing part (400B) is a third contact plate (450) that comes into contact with the rear end of the second compression spring (320),
A fourth contact plate (460) that is positioned close to the third contact plate (450) and supported by the cylinder body (210) and has a shape symmetrical to the third contact plate (450), and
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it comprises at least one pressure sensor (430) that outputs tension displacement information of a second compression spring (320) that is arranged between the third and fourth contact plates (450, 460) and comes into contact with the third contact plate (450) as an electrical signal to the control unit (600). In claim 2,
The above first and second detection units (400A, 400B) have a step portion (412, 422) formed in a groove shape downward on the upper surfaces of the first and second contact plates (410, 420) that are in contact with each other and the upper surfaces of the third and fourth contact plates (450, 460) that are in contact with each other,
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it further comprises a filler (440) that is connected so that the harness wiring (432) of the pressure sensor (430) passes through it and is filled and hardened within the step portion (412, 422) to fix and cushion the harness wiring (432). In claim 4,
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that the above filler (440) is an epoxy resin. In claim 1,
The above first and second detection units (400A, 400B) are arranged vertically with respect to the pin coupling groove of the above movable hook (110) and include a first proximity sensor (510) that detects the coupling state of the first attachment pin (10) and the above movable hook (110).
A sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it further comprises a second proximity sensor (520) that is arranged horizontally with respect to the pin coupling groove of the above-mentioned fixed hook (120) and detects the coupling state of the second attachment pin (20) and the fixed hook (120). In claim 1,
The above notification unit (500) is positioned on the excavator arm (55) and the excavator cabin (52), respectively, and is a sliding quick coupler equipped with a pressure sensor for detecting spring tension, characterized in that it is a warning light (510) or an alarm device (520) that lights up when a control signal from the control unit (600) is applied.

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