KR101820405B1 - Auto safty device for quick coupler - Google Patents

Abstract

The present invention relates to an automatic safety device for a quick coupler a structure of which is enhanced to simplify a structure of a locking device for preventing the temporary release of locking engagement of a fixing hook using a blocking block interlocked with a hitch to be simply slid in a transverse direction after an assembly of a fixed hook and a first attachment pin. The automatic safety device comprises: a quick coupler body connected to an arm of an excavator; the fixing hook provided on one side of the quick coupler body, engaged with the first attachment pin, and having a locking step with one end portion at an entry protruding upward; the hitch provided on the other side of the quick coupler body, connected to a cylinder rod of a cylinder, and engaging with a second attachment pin when the cylinder rod moves forward; and a locking means provided to prevent the temporary release of the engagement state of the fixing hook and the first attachment pin. The locking means comprises: a support plate fixated on the one side of the quick coupler body; a support bolt having one end portion fastened to the support plate; the blocking block having a support step formed on an upper portion and a block portion protruding downward from a lower portion, wherein the support bolt passes through the support step; a support spring with an elastic force engaged with the support bolt, supported on a head portion of the support bolt and the support step, and pushing the blocking block to an upper side of the fixing hook; and a moving means moving an outer cylinder block engaged with a cylinder housing of the cylinder when the hitch is rotated in a clockwise direction so as to move the blocking block to the upper side of the fixing hook along the movement of the outer cylinder block.

Description

{AUTO SAFTY DEVICE FOR QUICK COUPLER}

The present invention relates to an automatic safety device for a quick coupler, and more particularly to an automatic safety device for a quick coupler, which uses a blocking block which is interlocked with the motion of a hitch after being assembled with a fixed hook and a first attachment pin, To an automatic safety device for a quick coupler whose structure is improved so that a structure of a locking device for preventing a locking device from being deteriorated can be easily configured.

Generally, heavy equipment used in construction site or civil engineering site, for example excavator is widely used construction equipment such as road construction, waterworks and drainage construction, construction foundation construction, land construction construction, Depending on the application, various attachments can be installed selectively to perform the work.

For example, it is possible to use a bucket for grounding, crushing and rebuilding concrete buildings using a crusher, rock and concrete destruction using a breaker, and scrap and rock transport using a grab , And work on the foundation work of construction of vertical shaft and waterworks and sewerage using clamshell bucket. It is possible to perform various work while replacing various kinds of attachments.

In general, the attachment is attached to the arm of the excavator so that it can be replaced with the purpose of the work, and recently, a separate coupler is mounted on the arm of the excavator, and a quick coupler Has been developed and widely used.

The quick coupler is rigidly mounted to the arm of the excavator and the push link of the cylinder through the two pin coupling structures in the quick coupler body, and is structured so that the attachment can be fastened by using the fixed hook and the hitch.

Accordingly, the operator can easily handle and use the attachment by a method in which the operator of the excavator operates the lever to couple or separate the quick coupler mounted on the end of the arm to a bucket, a breaker, or the like.

On the other hand, the quick coupler is equipped with a safety device, for example, a safety pin, as a means to prevent the risk of separation of the attachment due to a malfunction of the hydraulic cylinder in the quick coupler or damage to the hydraulic hose .

However, when replacing an attachment such as a bucket or a breaker in a quick coupler, the worker must manually manually remove the safety pin from the attached attachment or fasten the safety pin after mounting the new attachment, which makes the work difficult and cumbersome In addition, there is a disadvantage that it takes a lot of time to work.

Prior art related to this is disclosed in Korean Patent Registration No. 10-0739341 entitled " Heavy-duty Attachment Coupler with Automatic Safety Device "(Registered Date: 2007.07.09), the transfer hook is connected to a hydraulic cylinder and an automatic safety device cylinder And the automatic safety device cylinder is unlocked only when the hydraulic cylinder is normally released. In this case, however, the automatic safety device cylinder must be separately provided.

As another prior art, in Korean Registered Patent Publication No. 10-1210833 entitled " automatic safety device of a quick coupler "(registration date: 2012.12.05), on the upper side of the fixed hook The hitch is interlocked to prevent the pin from coming off. However, there is still a problem due to the failure of the hydraulic cylinder or the damage of the hydraulic hose, and the reliability of the safety device is low.

As another prior art, as disclosed in Korean Registered Patent Publication No. 10-1665663 entitled " Dual Safety Device of Quick Coupler "(Registered Date: October 6, 2016), a quick coupler It is possible to automatically prevent any detachment between the attachment pin and the fixed hook in the connecting process of the hitch and to operate the locking device in conjunction with the operation of the cylinder for slidingly moving the hitch and the elastic force of the first and second compression springs It is.

However, in the case of the safety device of the existing fixed hook, there is a disadvantage that the structure of the safety device for preventing the engagement state with the attachment pin coupled to the fixed hook is not arbitrarily released, and the maintenance of the parts is not easy.

In addition, there is a risk of a safety accident if the operation of the existing locking device can not be performed smoothly due to a complicated structure.

Korean Registered Patent Publication No. 10-0739341 entitled "Heavy-duty Attachment Coupler with Automatic Safety Device" (Registered on July 7, 2007) Korean Registered Patent Publication No. 10-1210833 entitled "Automatic Safety Device of Quick Coupler" (Registered on December 22, 2012) Korean Registered Patent Publication No. 10-1665663 entitled " Dual Coupler of Quick Coupler "(Registered on May 20, 2016)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an apparatus and a method for mounting a stationary hook and a first attachment pin, An automatic safety device for a quick coupler whose structure is improved so as to easily constitute a structure of a locking device for preventing a locking hook of a fixed hook from being arbitrarily released by disposing a blocking block on the upper side of a fixed hook while slidably moving in a lateral direction .

In order to accomplish the above object, the present invention provides a quick coupler comprising: a quick coupler body connected to an arm of an excavator; a fixed hook provided on one side of the quick coupler body and coupled with a first attachment pin, A hitch which is provided on the other side of the quick coupler body and is connected to the cylinder rod of the cylinder so as to be engaged with the second attachment pin during the advancing operation of the cylinder rod, The fastening means includes a support plate fixed to one side of the quick coupler body, a support bolt to which one end of the support plate is fastened to the support plate, and a support jaw to allow the support bolt to pass therethrough A blocking block having a block portion protruding downwardly downwardly therefrom, a blocking block coupled to the supporting bolt, A support spring supported on the support jaw and having an elastic force to push the blocking block upwardly of the fixing hook; and an outer cylinder block coupled to the cylinder housing of the cylinder when the hitch is rotated clockwise, And a moving means for moving the blocking block to the upper side of the fixed hook in accordance with the movement of the block, wherein the moving means is coupled to one side of the quick coupler body, and the end portion of the cylinder housing is pin- A stopper fixed to the other side of the quick coupler body and restricting a rotation angle of the hitch when the cylinder rod is compressed; and a stopper which is coupled to surround the outside of the cylinder housing and compresses the cylinder rod, The frame pin is moved toward the hitch side with respect to the frame pin An outer cylinder block which is moved to the frame pin side when the cylinder rod is extended, an inner cylinder block which is coupled to surround the cylinder rod, one side of which is connected to the hitch by pin connection and the other side is disposed inside the outer cylinder block, And a second link member having one side connected to the other side of the first link member through a sliding pin and the other side integrally connected to the blocking block. do.

The support springs are composed of a plurality of spaced-apart support springs.

The height of the lower surface of the block portion is located at a position where the first attachment pin interferes with the engagement jaw so that the first attachment pin is not separated from the fixing hook when the blocking block is located on the upper side of the fixed hook.

The quick coupler body is formed with guide grooves for guiding lateral sliding movement of the blocking block by supporting both side portions of the blocking block on inner sides facing each other.

And an elastic spring for supporting one end of the end portion of the cylinder housing on an outer periphery of the cylinder housing and the other end of which is supported by the inner cylinder block to provide an elastic force to the hitch side.

In order to prevent any quick release of the quick coupler for connection between an excavator and a heavy equipment attachment device, an outer cylinder block operated in conjunction with rotation of the hitch, and first and second link members, It is possible to fasten and unfasten the first attachment pin by slidably moving the block in the lateral direction so that the safety device can be fastened and released with a simple structure for moving the block in the lateral direction, It is possible to reduce the factors and improve the product safety.

When the blocking block is located on the upper side of the fixed hook, the height of the lower surface of the block portion of the present invention is located at a position where the first attachment pin is interfered with the stopping jaw so as to prevent the first attachment pin from being detached from the fixing hook, The first attachment pin can be inserted and removed through the inlet of the fixed hook while the first attachment pin can be prevented from departing after the blocking block is moved to the right so as to be positioned on the upper side of the fixed hook.

In addition, since the guide groove portions for guiding the sliding movement of the blocking block are formed on the inner side surfaces of the quick coupler bodies facing each other, both sides of the blocking block are smoothly moved .

1 is an external perspective view of a quick coupler equipped with an automatic safety device for a quick coupler according to the present invention;
2 is a perspective view of the quick coupler safety device of the present invention.
3 is a bottom perspective view showing the structure of FIG.
4 is a front view showing a cylinder configuration in a state in which the cylinder block of the present invention is omitted.
Fig. 5 is a state of use in which the blocking block of the present invention is moved to the upper side of the fixed hook, and a safety device is fastened. Fig.
FIG. 6 is a state of use in which the blocking block of the present invention is moved to the left, and the safety cylinder is released when the external cylinder block and the first and second link members are interlocked by the movement of the hitch.

1 to 4, the automatic safety device for a quick coupler according to the present invention comprises a quick coupler body 100 connected to an arm of an excavator, a first coupler 100 provided on one side of the quick coupler body 100, A fixing hook 110 which is coupled with the attachment pin 10 and has a stopping protrusion 112 protruding upward at an inlet side end thereof and a fixed hook 110 which is provided on the other side of the quick coupler body 100, A hitch 120 connected to the first attachment pin 220 and coupled to the second attachment pin 20 during a forward movement of the cylinder rod 220 and a hitch 120 connected to the fixed hook 110 and the first attachment pin 10, Wherein the locking means 300 includes a support plate 310 fixed to one side of the quick coupler body 100 and a locking plate 300 fastened to the support plate 310 at one end thereof A supporting bolt 320 and a supporting jaw 332 so that the supporting bolt 320 passes through the supporting bolt 320 A blocking block 330 formed with a block portion 334 protruding downward in the lower portion and a blocking block 330 coupled to the supporting bolt 320 and supported by the head portion of the supporting bolt 320 and the supporting jaw 332 A support spring 340 having an elastic force for pushing the blocking block 330 upward from the fixed hook 110 and a spring housing 340 for supporting the cylinder housing 210 of the cylinder 200 when the hitch 120 is rotated clockwise And moving means 400 for moving the blocking block 330 to the upper side of the fixing hook 110 in accordance with the movement of the outer cylinder block 430 by moving the outer cylinder block 430 coupled with the outer cylinder block 430 .

Referring to FIG. 1, the quick coupler body 100 includes a left side portion 100A and a right side portion 100B of a symmetrical structure spaced apart from each other, and an outer cylinder block 100B between the left side portion 100A and the right side portion 100B The cylinder 200 is disposed inside the cylinder block 430.

The left side portion 100A and the right side portion 100B are connected by a connecting pin 130. [

A hitch 120 is provided on the left side of the quick coupler body 100 to be rotated by the operation of the cylinder rod 220 of the cylinder 200. A hitch 120 is provided on the right side of the quick coupler body 100, And a hook 110 is provided.

Referring to FIG. 4, the cylinder 200 includes a cylinder housing 210 having one side thereof coupled to the quick coupler body 100 by being coupled with the cylinder body 210 by being coupled with the quick coupler body 100, And a cylinder rod 220.

The cylinder rod 220 of the cylinder 200 is connected to the hitch 120 so that the hitch 120 is connected to the hinge pin 122 coupled to the other side of the quick coupler body 100 according to the operation of the cylinder 200, .

In addition, the cylinder 200 is provided with an elastic spring 230 for applying an elastic force to the hitch 120 to prevent it from separating from the second attachment pin 20 even if the hydraulic pressure is cut off.

The elastic spring 230 is supported by a support step 211 provided at the outer periphery of the cylinder housing 210 at one end thereof and adopts a compression spring for providing an elastic force toward the hitch 120 side.

2, the moving means 400 includes a frame pin 410 coupled to one side of the quick coupler body 100 and coupled to an end of the cylinder housing 210 so as to rotate the cylinder 200, A stopper 420 fixed to the other side of the quick coupler body 100 and restricting the rotation angle of the hitch 120 when the cylinder rod 220 is compressed; And the cylinder rod 220 is compressed to be slid toward the hitch 120 with respect to the frame pin 410 when the rotation of the hitch 120 is restricted by the stopper 420, An outer cylinder block 430 which is moved to the side of the frame pin 410 when the cylinder block 220 is extended and a cylinder block 220 which is coupled to surround the cylinder rod 220 and one side is connected to the hitch 120 by a pin connection, An inner cylinder block 440 disposed inside the inner cylinder block 440; A first link member 452 having one side connected to the outer cylinder block 430 and a second link member 452 having one side connected to the other side of the first link member 452 and the other side connected to the blocking block 330 integrally A second link member 454 connected to the first and second link members 452 and 454 and a sliding pin 454 connecting the first and second link members 452 and 454 to adjust the distance between the first and second link members 452 and 454, (455).

The support bolt 320 is fastened to the support plate 310 while being passed through the support tab 332 of the blocking block 330.

The support spring 340 has a structure in which one end is supported by the support step 332 and the other end is supported by the head part of the support bolt 320.

The support springs 340 are composed of a plurality of spaced-apart compression springs.

The support plate 310 is fixed so as to be integrally connected to the inner surface of the quick coupler body 100.

3, a guide groove (not shown) is formed in the inner side surfaces of the left and right side portions 100A and 100B and supports both sides of the blocking block 330 to guide lateral sliding movement of the blocking block 330. [ (105) is formed.

Accordingly, the blocking block 330 has a structure in which both side portions are supported in the guide groove portion 105 and can move laterally.

In the present invention having such a configuration, when the quick coupler fastening switch is operated after the first attachment pin 10 is fitted into the fixed hook 110, the hydraulic pressure is supplied to the cylinder 200 side as shown in FIG. 5 The cylinder rod 220 is extended and the hitch 120 is rotated in the direction of the clockwise movement with respect to the hinge pin 122 for engagement with the second attachment pin 20, The outer cylinder block 430 is moved toward the frame pin 410 and the first and second link members 452 and 454 are shifted in the diagonal direction so that the blocking block 330 is engaged with the fixing hook 110 And moves it upward.

At this time, since the support spring 340 pushes the support protrusion 332 with the end portion thereof being fastened to the support plate 310 by the restoring elastic force, the stop block 330 is moved in the horizontal direction toward the upper side of the fixation hook 110 To provide a resilient force to push.

The block portion 334 of the blocking block 330 is located above the entrance of the fixed hook 110 and the height of the bottom portion of the block portion 334 is set to be the same as the height of the blocking block 330 of the fixing hook 110, The first attachment pin 10 is positioned at a position where the first attachment pin 10 interferes with the engagement protrusion 112 so that the first attachment pin 10 is not detached from the fixed hook 110.

The first attachment pin 10 coupled to the stationary hook 110 is positioned such that the distance between the lower surface of the stop block 330 and the stop 112 is smaller than the outer diameter of the first attachment pin 10, The first attachment pin 10 is prevented from being detached from the first attachment pin 110. FIG.

As a result, after the first attachment pin 10 is fastened to the fixing hook 110 and the second attachment pin 20 is fastened to the hitch 120, the elastic spring 230 and the support spring 340, which are compression springs, A blocking block 330 is provided on the upper side of the fixing hook 110 even if the hitch 120 and the second attachment pin 20 are separated due to the occurrence of hydraulic defects. It is possible to prevent the first attachment pin 10 from being detached from the fixed hook 110, so that the connection between the heavy-duty attachment and the excavator can be maintained.

6, when the cylinder rod 220 is compressed, the cylinder rod 220 is retracted into the cylinder housing 210 to be retracted into the cylinder housing 210. In this case, The tip portion 121 of the hitch 120 is rotated about the hinge pin 122 in a direction opposite to the traveling direction of the hour hand while the tip portion 121 is in contact with the stopper 420 during the rotation of the hitch 120, The cylinder housing 210 and the outer cylinder block 430 are slid toward the hitch 120 due to the extra cylinder rod 220 stroke, The cylinder block 430 and the inner cylinder block 440 are overlapped to pull the first link member 452 connected to the outer cylinder block 430.

Thereafter, as a tensile force is transmitted to the second link member 454 through the first link member 452, the blocking block 330 connected to the second link member 454 is lifted from the upper side of the fixed hook 110, The safety device is released while sliding in the left direction.

At this time, the blocking block 330 is moved in the lateral direction while being supported by the guide groove portion 105.

As a result, the external cylinder block 430 and the first and second link members 452 and 454 are interlocked by the movement of the hitch 120, so that the safety device is released and the excavator can be removed from the heavy equipment attachment.

In order to prevent any quick release of the quick coupler for connection between the excavator and the heavy equipment attachment device, the present invention described above includes an outer cylinder block 430, which is operated in conjunction with the rotation of the hitch 120, The blocking block 330 can be slid transversely on the upper side of the fixing hook 110 using the link members 452 and 454 so that the first attachment pin 10 can be restrained and restrained. The safety device can be fastened and disassembled with a simple structure in which the safety device can be moved in the lateral direction, which simplifies the operation, reduces the factors of component failure, and improves the product safety.

The height of the lower portion of the present invention block portion 334 is set to be greater than the height of the stopping block 112 when the blocking block 330 is positioned on the upper side of the fixed hook 110 so that the first attachment pin 10 is not separated from the fixed hook 110 The first attachment pin 10 can be moved in and out through the entrance of the fixed hook 110 while the first attachment pin 10 is positioned at the position where the first attachment pin 10 is interfered with The first attachment pin 10 can be prevented from departing after it is moved to the right so as to be positioned on the upper side of the fixed hook 110.

The present invention is also characterized in that guide groove portions 105 for guiding the sliding movement of the blocking block 330 are formed on inner side surfaces of the right side portion 100B and the left side portion 100A of the quick coupler body 100, Accordingly, when the blocking block 330 is slid in the lateral direction, both sides of the blocking block 330 can be supported and smoothly moved.

10: first attachment pin 20: second attachment pin
100: Quick coupler body 100A:
100B: right side portion 110: fixed hook
112: hanging jaw 120: hitch
121: leading end 130: connecting pin
200: cylinder 210: cylinder housing
220: cylinder rod 230: elastic spring
300: locking means 310: support plate
320: Support bolt 330: Blocking block
332: support jaw 334:
340: support spring 400: moving means
410: frame pin 420: stopper
430: outer cylinder block 440: inner cylinder block
452: first link member 454: second link member
455: Sliding pin

Claims (5)

A quick coupler body 100 connected to the arm of the excavator and a catching protrusion 112 provided at one side of the quick coupler body 100 and coupled to the first attachment pin 10 and having an inlet end protruding upward And a second attachment pin 20 which is provided on the other side of the quick coupler body 100 and is connected to the cylinder rod 220 of the cylinder 200 to move the cylinder rod 220 forward And a locking means (300) for preventing the engagement of the fixing hook (110) and the first attachment pin (10)
The locking means 300 includes a support plate 310 fixed to one side of the quick coupler body 100, a support bolt 320 fastened at one end to the support plate 310, A blocking block 330 formed with a block 334 protruding downward at a lower portion thereof and a support block 332 coupled to the support bolt 320, A support spring 340 which is supported by the head part and the support step 332 and has an elastic force for pushing the stop block 330 to the upper side of the fixing hook 110, The outer cylinder block 430 coupled with the cylinder housing 210 of the cylinder 200 is moved so that the blocking block 330 is moved to the upper side of the fixed hook 110 according to the movement of the outer cylinder block 430 (400) for moving the movable member
The moving means 400 includes a frame pin 410 coupled to one side of the quick coupler body 100 and having an end of the cylinder housing 210 pin-coupled to rotate the cylinder 200, A stopper 420 fixed to the other side of the cylinder housing 210 and limiting the rotation angle of the hitch 120 when the cylinder rod 220 is compressed; 220 is compressed and is moved toward the hitch 120 with respect to the frame pin 410 when the rotation of the hitch 120 is restricted by the stopper 420. When the cylinder pin 220 is extended, An outer cylinder block 430 which is connected to the cylinder block 420 and which is connected to the cylinder rod 220 so that one end thereof is connected to the hitch 120 and the other end thereof is disposed inside the outer cylinder block 430; A block 440, The first link member 452 is connected to the other side of the first link member 452 through the sliding pin 455 and the other side is connected to the blocking block 330 through the sliding pin 455. [ And a second link member (454) connected to the second link member (454). The method according to claim 1,
Wherein the support springs (340) are spaced apart from each other. The method according to claim 1,
The height of the lower portion of the block portion 334 is set to be smaller than the height of the locking hook 330 so that the first attachment pin 10 is not detached from the fixing hook 110 when the blocking block 330 is positioned on the upper side of the fixed hook 110 112) is located at a position where the first attachment pin (10) interferes with the first attachment pin (10). The method according to claim 1,
The quick coupler body 100 has guide grooves 105 for supporting both sides of the blocking block 330 and guiding the sliding movement of the blocking block 330 in the lateral direction on the inner side facing each other. Automatic safety device for quick couplers. The method according to claim 1,
An elastic spring 230 is provided for supporting one end of the end portion of the cylinder housing 210 on the outer circumference of the cylinder housing 210 and the other end of which is supported by the inner cylinder block 440 to provide an elastic force toward the hitch 120 And the automatic safety device for a quick coupler.

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