KR101533841B1 - Auto-safety device for quick coupler - Google Patents

Abstract

The present invention prevents an attachment pin and a quick coupler from being randomly separated in a connection process of the quick coupler to connect an attachment for heavy equipment and an excavator. Moreover, the present invention prevents, in advance, a coupling state of first and second attachment pins from being randomly separated with a linked operation related to movement of a cylinder tube without an additional cylinder. According to the present invention, an automatic safety device for a quick coupler comprises: a quick coupler body firmly installed in an end part of an arm of an excavator and a push link; a fixing hook provided on one side of the quick coupler body and coupled with the first attachment pin; a hitch provided on the other side of the quick coupler body and coupled and disassembled with the second attachment pin in accordance with a movement of the hydraulic cylinder; and a safety means linked with the cylinder tube of the hydraulic cylinder to maintain or disassemble the locking and coupling state of the first and second attachment pins.

Description

{AUTO-SAFETY DEVICE FOR QUICK COUPLER}

The present invention relates to an automatic safety device for a quick coupler, and in particular, a safety device is automatically released and locked by a sliding operation of a cylinder tube and an elastic force of a spring member, thereby providing a quick coupler connection The present invention relates to an automatic safety device for a quick coupler which is improved in structure so as to simplify the structure of a safety device capable of safely maintaining the engagement state of the first and second attachment pins in the process.

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, And various attachments are selectively installed according to the operation of the system.

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 movable hook.

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 "(registered on December 05, 2012), the sliding hook of the slide hook However, there is still a problem due to a failure of the hydraulic cylinder or damage of the hydraulic hose, and the reliability of the safety device is deteriorated.

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)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a safety attachment for a safety hook, The present invention provides an automatic safety device for a quick coupler which improves the safety of the apparatus so as to simplify the structure of the apparatus and to prevent arbitrary release of the engagement state between the fixed hook and the attachment pin when the hitch is operated.

According to an aspect of the present invention, there is provided an excavator 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 coupled to the rod of the cylinder and coupled with the second attachment pin during a forward movement of the rod, and a safety means for preventing any unlocking of the first and second attachment pins,

The safety means includes a cylinder tube connected to the rod of the hydraulic cylinder and slidingly moved rearward by a reaction force generated when the hitch and the second attachment pin are engaged with each other and a cylinder tube which is compressed in the backward movement of the cylinder tube, A safety bar for interlocking with the cylinder tube so as to be interlocked with the cylinder tube so as to be interlocked and interlocked and the end portion being in contact with one side of the hitch to restrict rotation of the hitch, And a safety hook which is connected to be interlocked via interlocking means and which is interlocked and rotated upon rotation of the safety bar to lock or unlock the engagement state of the first attachment pin and the fixed hook.

The hitch is formed with a stepped step portion at one side portion where the end portion of the safety bar is contacted.

The first interlocking means includes a fixing pin protruding from the outside of the cylinder tube, a first connecting pin protruding from the inside of the safety bar, a second connecting pin having one end pin- And a first link member which is connected to the connection pin and is connected to the safety bar to transmit the movement of the cylinder tube.

The second interlocking means includes a second connecting pin protruded outside the safety bar, a fitting pin protruding from the safety hook, and a second connecting pin having one end pin-engaged with the second connecting pin, And a second link member which is coupled to the pin so as to transmit the movement of the safety bar to the safety hook.

The safety hook is rotated in a direction opposite to the pin entry direction of the fixed hook and is locked and coupled with the first attachment pin.

The present invention can maintain the locking state between the first and second attachment pins by using the safety bar and the safety hook interlocked with each other in accordance with the phase difference of the slidable cylinder tube, , The engaging state of the first and second attachment pins is not released even if the driver erroneously operates or hydraulic pressure leakage occurs in the normal excavation area, and the restoring force of the spring member and the self weight of the safety bar and the safety hook The lock engagement state is released, so that there is a useful effect that the work convenience and the work safety are significantly increased.

In addition, the present invention has a simple structure that does not include a separate cylinder for locking engagement of the first and second attachment pins, so that the locking engagement state of the first and second attachment pins is not arbitrarily released, Respectively.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an automatic safety device of a quick coupler according to the present invention; FIG.
2 is a perspective view showing the safety means of the present invention.
3 is a state of use in which the safety means of the present invention is operated to show the locking engagement state of the first and second attachment pins.
4 is a state of use showing a locking-unlocking state of the safety means of the present invention.
5A and 5B are side views showing the state of the cylinder tube and the spring member when the locking means is unlocked or locked.
6 is a use state showing the maximum excavating attitude of an excavator for removal work of the safety means of the present invention.
7 is a use state showing a state in which the first and second attachment pins of the present invention are unlocked.

The present invention is characterized in that the attachment pin and the quick coupler are prevented from deviating from each other in the connection process of the quick coupler for connecting the heavy equipment attachment and the excavator, 1,2 Prevent the attachment state of the attachment pin from being arbitrarily released.

An embodiment of the automatic safety device of the quick coupler according to the present invention will be described with reference to Figs. 1 to 6 and 7, wherein the end of the excavator arm 15 and the quick coupler body A fixing hook 110 provided on one side of the quick coupler body 100 and coupled to the first attachment pin 21 and a second coupling pin 110 provided on the other side of the quick coupler body 100, A hitch 120 which is engaged with and disengaged from the second attachment pin 22 in accordance with an operation of the hitch 120 and a rod 134 connected to the hitch 120 by hydraulic pressure transmitted from the outside, And a safety means capable of maintaining or releasing the locking engagement state of the first and second attachment pins 21 and 22 in cooperation with the cylinder 130 and the cylinder tube 132 of the hydraulic cylinder 130.

2, the safety means is connected to the rod 134 of the hydraulic cylinder 130 and is connected to the rod 134 by a reaction force generated upon engagement of the hitch 120 and the second attachment pin 22 A spring member 230 which is compressed during backward movement of the cylinder tube 132 and applies a biasing force to the cylinder tube 132 in a unidirectional manner, A safety bar 210 interlocked with the first interlocking means to interlock with the first interlocking means and interlocked with the first interlocking means to limit rotation of the hitch 120 in the reverse direction by being in contact with one side of the hitch 120, A safety hook 220 connected to the first attachment pin 21 through the second interlocking means and interlocked with the safety bar 210 to lock or unlock the first attachment pin 21 and the fixed hook 110 .

The hitch 120 has a stepped step portion 125 formed at one side of the safety bar 210 where the front end of the safety bar 210 is contacted.

The stepped portion 125 takes into consideration that the step position of the step portion 125 on which the distal end portion of the safety bar 210 is seated is changed according to the distance between the first and second attachment pins 21 and 22.

The safety bar 210 has a structure in which the distal end portion of the safety bar 210 is seated on the step portion 125 when the hitch 120 rotates and the rear end portion thereof is axially coupled to the connection shaft 160 to be rotatable.

When the cylinder rod 134 rotates in the forward direction of the hitch 120 and the hitch 120 contacts the second attachment pin 22, And has a slidable structure in which a reaction force to move backward the cylinder tube 132 is transmitted and is operated backward.

For this purpose, the cylinder tube 132 is not fixed but has a structure capable of sliding in the axial direction with respect to the cylinder rod 134 as shown in Figs. 5A and 5B.

That is, the cylinder tube 132 acts as a force for compressing the spring member 230 elastically supported in the backward movement.

The spring member 230 is disposed between the connection shaft 160 to which the safety bar 210 is axially coupled and the cylinder tube 132 and has a function of providing a unidirectional elastic biasing force to the cylinder tube 132.

The first interlocking means includes a fixing pin 310 protruding from the outside of the cylinder tube 132, a first connecting pin 320 protruding from the inside of the safety bar 210, And a first link member 330 which is connected to the safety bar 210 by a pin so as to be fitted to the first connection pin 320 and the other end of which is coupled to the first connection pin 320 to transmit the movement of the cylinder tube 132 to the safety bar 210.

The first link member 330 has a function as a medium connecting the cylinder tube 132 and the safety bar 210 and moves the movement of the cylinder tube 132 to the safety bar 210 fixed to the connection shaft 160 And the safety bar 210 is rotated.

The second interlocking means includes a second connection pin 410 protruding from the outside of the safety bar 210, a fitting pin 420 protruding from the safety hook 220, And a second link member 430 coupled to the safety hook 210 to be engaged with the safety hook 210 and to be coupled to the other end of the safety pin 210 by a pin.

The second link member 430 transmits the rotational force of the safety bar 210 to the safety hook 220 to rotate the safety hook 220 toward the first attachment pin 21 coupled to the fixed hook 110 .

The safety hook 220 is rotatably coupled to the quick coupler body 100 and is rotated in accordance with the movement of the second link member 430. The safety hook 220 is rotated in a direction opposite to the pin entry direction of the fixed hook 110, And is locked and coupled with the first attachment pin (21).

Reference numeral 150 denotes a pulling ring provided on one side of the quick coupler body 100, and the pulling ring 150 can be used to carry the work without attaching the attachment.

The embodiment of the present invention having such a configuration is characterized in that after the quick coupler body 100 is connected to the end portion of the excavator arm 15 and the push link, the fixed hook 110 is moved to the first attachment pin 21 The rod 134 of the hydraulic cylinder 130 is advanced to engage the hitch 120 and the second attachment pin 22. [

3, the operation of the hydraulic cylinder 130 and the hitch 120 is such that when the hydraulic pressure is supplied from the outside into the hydraulic cylinder 130, the rod 134 is advanced and the forward movement of the rod 134 The hitch 120 axially coupled to the quick coupler body 100 is rotated in a forward direction to thereby engage the second attachment pin 22 with the opening of the hitch 120. [

At this time, even if the hydraulic pressure is supplied to the inside of the cylinder tube 132 after the hitch 120 is coupled to the second attachment pin 22, the cylinder tube 132 is retracted by the reaction force generated as the advance operation of the rod 134 is restricted, As a result, the spring member 230, which is in contact with the cylinder tube 132, is compressed.

The movement of the cylinder tube 132 is transmitted to the safety bar 210 by the first link member 330 according to the backward movement of the cylinder tube 132. At this time, And the other end is coupled to the first connection pin 320 provided inside the safety bar 210 so that when the cylinder tube 132 is retracted, The safety bar 210 is rotated.

At this time, since the tip of the safety bar 210 is seated on the step portion 125 of the hitch 120, the safety bar 210 functions as a stopper to block rotation of the hitch 120 from the second attachment pin 22.

Since the safety bar 210 is connected to the safety hook 220 via the second link member 430, the rotational force of the safety bar 210 during rotation of the safety bar 210 is transmitted to the safety hook 220 are rotated.

The safety hook 220 is coupled to the first attachment pin 21 in a form of wrapping the first attachment pin 21 coupled to the fixed hook 110 during rotation with a portion opposite to the coupling portion of the fixed hook 110 , And locks the engaged state of the first attachment pin (21) and the fixed hook (110).

In particular, in the safety means of the present invention, when the driver inadvertently presses an unlocking switch (not shown) in the driver's seat by an erroneous operation during a normal excavation operation, hydraulic pressure for releasing the locking state is supplied to the hydraulic cylinder 130, The reverse rotation of the hitch 120 is restricted due to the stopper function of the safety bar 210 and the spring member (not shown) The safety bar 210 is not rotated only by the elastic force of the first attachment pin 230 and the second attachment pin 22 and the hitch 120 is not released from the engagement state.

Also, even if the hydraulic cylinder 130 is lost due to oil leakage, the safety means of the present invention can prevent the first and second attachment pins from being released, .

Meanwhile, according to the present invention, when the use of the attachment coupled to the quick coupler is completed and it is desired to remove the attachment, the first and second attachment pins and the quick coupler can be removed in the reverse order of the coupling order.

6, the operator supplies the hydraulic pressure to the excavator arm cylinder 40 to advance the rod member 45 of the excavator arm cylinder 40 so that the excavator 10 has the maximum excavating attitude And pushing the push link 30 to move the excavator arm 15 and the quick coupler body 100 forward.

At this time, when the quick coupler body 100 is crushed, the fixing hook 110 located at the lower portion of the quick coupler body is positioned to face upward.

4 and 7, the safety bar 210 and the safety hook 220 are pressed against each other by their own weights, as shown in FIGS. 4 and 7, A force for rotating the cylinder tube 132 to the original position is applied to the spring member 230 and the restoring force of the previously compressed spring member 230 is added, The distal end of the safety bar 210 is separated from the step portion 125 of the hitch 120 while the bar 210 is rotated with respect to the connecting shaft 160. When the safety hook 220 is separated from the first attachment pin 21, The rod 134 of the hydraulic cylinder is operated to be retracted and the hitch 120 is rotated in the direction of detaching from the second attachment pin 22 and removed.

As a result, the quick coupler body 100 is separated from the first and second attachment pins 21 and 22, and the attachment device and the quick coupler are detached.

Therefore, the safety bar 210 and the safety hook 220, which are interlocked with each other according to the phase difference of the slidable cylinder tube 132, 2 attachment pin can be maintained. In the normal excavation area, the engagement state of the first and second attachment pins is not released even if the driver erroneously operates or oil leakage occurs, The restraining force of the safety bar 230 and the weight of the safety bar 210 and the safety hook 220 are released, so that the convenience of operation and the safety of work are significantly increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: Excavator 15: Excavator arm
21: first attachment pin 22: second attachment pin
30: Push link 40: Excavator arm cylinder
45: rod member 100: quick coupler body
110: fixed hook 120: hitch
125: step jaw 130: hydraulic cylinder
132: cylinder tube 134: rod
150: pulling ring 160: connecting shaft
210: Safety bar 220: Safety hook
230: spring member 310: fixing pin
320: first connecting pin 330: first link member
410: second connecting pin 420:
430: second link member

Claims (5)

A fixed hook 110 provided on one side of the quick coupler body 100 to be coupled to the first attachment pin 21 and a second coupling pin provided on the side of the quick coupler body 100, A hitch 120 provided on the other side and connected to a rod 134 of the hydraulic cylinder 130 and coupled with the second attachment pin 22 during a forward movement of the rod 134, And safety means for preventing arbitrary release of the coupled state,
The safety means includes a cylinder tube 132 connected to the rod 134 of the hydraulic cylinder 130 and slidingly moved rearward by a reaction force generated when the hitch 120 is engaged with the second attachment pin 22, Wow,
A spring member 230 that is compressed during the backward movement of the cylinder tube 132 and applies a unidirectional elastic biasing force to the cylinder tube 132,
A safety bar 210 interlocked with the cylinder tube 132 to interlock with the cylinder tube 132 to interlock with the cylinder tube 132 to limit the rotation of the hitch 120 by contacting one end of the hitch 120,
The first attachment pin 21 and the fixed hook 110 are coupled to each other via the second interlocking means so that the first attachment pin 21 and the fixed hook 110 are locked or unlocked when the safety bar 210 rotates, And a safety hook (220) for guiding the safety of the quick coupler. The method according to claim 1,
Wherein the hitch (120) is formed with a stepped step portion (125) at one side portion where the end portion of the safety bar (210) is contacted. The method according to claim 1,
The first interlocking means includes a fixing pin 310 protruded outside the cylinder tube 132,
A first connection pin 320 protruding from the inside of the safety bar 210,
A first link member 330 that is coupled at one end to the fixing pin 310 and is coupled to the first connecting pin 320 at the other end to transmit the movement of the cylinder tube 132 to the safety bar 210, And an automatic safety device of the quick coupler. The method according to claim 1,
The second interlocking means includes a second connection pin 410 protruding from the outside of the safety bar 210,
A fitting pin 420 protruding from the safety hook 220,
A second link member 430 is coupled to one end of the second connection pin 410 so as to be fitted into the second connection pin 410 and the other end of the second link member 430 is coupled to the fitting pin 420 to transmit the movement of the safety bar 210 to the safety hook 220, And an automatic safety device of the quick coupler. The method according to claim 1,
Wherein the safety hook (220) is rotated in a direction opposite to a pin entry direction of the fixing hook (110) and is locked with the first attachment pin (21).

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