KR20210069486A - Quick Coupler having safety device - Google Patents

Abstract

The present invention relates to a quick coupler with a safety device, which comprises: a body having a fixed hook integrally provided at one end and a movable hook rotatably installed at the other end; a pair of fixing pins engaged with the movable hook and the fixed hook, respectively; a driving unit installed on the body to couple any one of the pair of fixing pins to be engaged with the movable hook as the movable hook is rotated or release the coupling; a link unit connected to one end of the driving unit and rotated by a predetermined angle by the operation of the driving unit and moved by a predetermined interval; and the safety key which releases the engagement on the other fixing pin disposed on the fixed hook in accordance with the movement of the link unit when the body is positioned in a state in which the pair of fixing pins are inclined at an inclination at which free fall is not made by the weight of a bucket, and keeps the engagement on the other fixing pin disposed on the fixed hook when the body is positioned in a state in which the pair of fixing pins are inclined at an inclination at which the free fall is made by the weight of the bucket. The present invention can prevent a work tool from being separated from the quick coupler.

Description

Quick Coupler having safety device

The present invention relates to a quick coupler, and more particularly, it is installed on the arm of an excavator so that various work tools can be quickly connected or disconnected, and the cylinder that restrains the work tool loses its function due to a malfunction occurring during work. Even so, it relates to a quick coupler equipped with a safety device that can prevent the work tool from being separated from the quick coupler.

In general, heavy equipment for construction and civil engineering, such as excavators, uses work tools such as breaker, bucket, crusher, etc. to dig the ground, process the soil excavated from the ground, or crush rocks, etc., and these Work tools are used interchangeably according to the content of the work.

In the conventional device for coupling a work tool, a coupler is coupled with a pair of fixing pins to the tip of the arm of an excavator, a fixing hook is provided on one side of the coupler and a movable hook is rotatably coupled to the other side of the coupler, and the movable hook is a coupler It is configured to be rotated by the operation of a cylinder mounted therein.

In addition, a pair of fixing pins formed on the upper side of the work mechanism are inserted into the fixing hook and the movable hook to be coupled.

Accordingly, the coupler coupled to the front end of the arm is brought close to the upper side of the work tool, the second fixing pin is inserted into the fixing hook, and the first fixing pin is coupled to the movable hook of the other side, and the movable hook is operated by the cylinder. The opening and closing operation is performed so that the first fixing pin is coupled therein.

However, such a conventional technique is made by a cylinder operated by the action of hydraulic pressure as a means for operating the movable hook, and there is convenience in combining or separating the work tool from the driver's seat, but the hydraulic pressure is applied to the cylinder inside the coupler. By requiring a hydraulic line for supplying, problems such as complexity of the device and increase in cost were inherent.

Accordingly, a quick coupler for an excavator has been developed in order to solve the above problems, and the movable hook of the quick coupler for an excavator according to the prior art includes a hinge part coupled to a hinge pin coupled to a support plate installed at intervals, and is movable. A safety pin is inserted and installed on the rear side of the hook, and the locking bolt is separably fastened to the front side by penetrating the locking plate to the boss coupled to the front of the movable hook.

However, since the conventional quick coupler for an excavator is provided with a safety pin and a locking bolt for maintaining the coupled state of the movable hook, the coupling structure of the safety pin and the locking bolt is complicated, thereby reducing the time and cost required for manufacturing the quick coupler. There was a problem that it was difficult to do, and also there was a problem that it was difficult to reduce the time required for the replacement work of the work tool because the work tool can be replaced after the safety pin and the locking bolt are released. have.

Korean Patent Publication No. 10-2009-0118331 (2009.11.18.) Korean Patent Registration No. 10-1825724 (2018.01.30.)

The present invention has been devised in view of the various problems described above, and the technical problem to be solved by the present invention is to be installed on the arm of an excavator to quickly connect or disconnect various work tools, and to prevent malfunctions occurring during work. It is to provide a quick coupler equipped with a safety device that can prevent the work tool from being separated from the quick coupler even if the hydraulic pressure is lost from the cylinder constraining the work tool by the

In particular, the technical problem to be solved by the present invention is a quick coupler even when hydraulic pressure is lost from a cylinder constraining a work tool due to a malfunction occurring during work or a safety pin to prevent it is broken and does not function properly. It is to provide a quick coupler equipped with a safety device that can prevent the work tool from being separated from the

In addition, another technical problem to be solved by the present invention is so that the movable hook and the fixing hook are unlocked only at positions where free fall is not achieved because the first fixing pin and the second fixing pin are separated by the weight of the bucket. In the position where the movable hook and the fixing hook are separated from the first fixing pin and the second fixing pin by the weight of the bucket and free fall occurs, the fixing hook intercepts the second fixing pin to eliminate the risk of safety accidents. It is to provide a quick coupler equipped with a safety device.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A quick coupler with a safety device according to an embodiment of the present invention for solving the above problems is provided integrally with a fixed hook at one end, and a main body in which a rotatably movable hook is installed at the other end; a pair of fixing pins engaged with the movable hook and the fixing hook, respectively; a driving unit installed on the main body to engage or release any one of the fixing pins among the pair of fixing pins to be caught by the movable hook as the movable hook is rotated; a link unit connected to one end of the driving unit and rotated by a predetermined angle by the operation of the driving unit and moved by a predetermined interval; and when the main body is positioned in a state in which the pair of fixing pins are inclined at an inclination that does not cause free fall due to the weight of the bucket, the other fixing pin disposed on the fixing hook according to the movement of the link part. When the main body is positioned in a state where the pair of fixing pins are inclined at an inclination in which a free fall is achieved by the weight of the bucket, the locking of the other fixing pin disposed on the fixing hook is released. It may be of a configuration including a safety key to be maintained.

Here, the link part, the upper side of the shaft is axially installed with respect to the main body by the shaft, and as one end of the driving part is connected and coupled to the lower side, the lower side is at a certain angle based on the shaft by the driving of the driving part. As much as the rotation is made, the movement can be made at a predetermined interval.

At this time, a pair of brackets are installed on one side of the link unit, and the safety key is coupled to the pair of brackets by a coil spring to receive a force to rotate in one direction.

On the other hand, the safety key may interfere with the link part according to the movement of the link part when the main body is positioned in a state where the pair of fixing pins are inclined at a slope that does not cause free fall due to the weight of the bucket. This is released, and the intermittent with respect to the second fixing pin may be released by rotating inside the main body by the elastic force of the coil spring.

In addition, in the safety key, when the main body is positioned in a state in which the pair of fixing pins are inclined at a slope where free fall is made by the weight of the bucket, the second fixing pins are moved by the clearance in the fixing hooks. As the contact occurs, it is possible to maintain the interruption with respect to the second fixing pin without rotating inside the body by the elastic force of the coil spring.

Other specific details of the invention are included in the detailed description and drawings.

According to the quick coupler equipped with a safety device according to an embodiment of the present invention, it is installed on the arm of the excavator so that various work tools can be quickly connected or disconnected, hydraulic pressure from the cylinder constraining the work tools due to malfunctions occurring during work Even if this is lost, the effect that the work tool is prevented from being separated from the quick coupler can be provided.

In particular, according to the quick coupler equipped with a safety accident according to an embodiment of the present invention, hydraulic pressure is lost from the cylinder constraining the work tool due to a malfunction that occurs during work, or the safety pin to prevent it is broken and functions properly Even if not, the effect of preventing the work tool from being separated from the quick coupler can be provided.

In addition, according to the quick coupler equipped with a safety accident according to an embodiment of the present invention, the movable hook and the fixed hook are separated by the weight of the bucket, the first fixed pin and the second fixed pin, respectively, only at positions where free fall is not made. The lock is released, and the second fixing pin of the fixing hook is intermittently opened at the position where the movable hook and the fixing hook are separated by the weight of the bucket and the first fixing pin and the second fixing pin are separated and free fall is made. A useful effect of dispelling concerns can be provided.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a perspective view of a quick coupler equipped with a safety device according to an embodiment of the present invention.
Figure 2 is a configuration diagram showing a state in which the moving hook and the fixed hook are each locked in the quick coupler equipped with a safety device according to an embodiment of the present invention.
Figure 3 is a configuration diagram showing a state in which the moving hook and the fixed hook are opened, respectively, in a quick coupler equipped with a safety device according to an embodiment of the present invention.
Figure 4 is a configuration diagram showing a state in which the fixed hook is locked in an open state of the movable hook in a quick coupler equipped with a safety device according to an embodiment of the present invention.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Accordingly, in some embodiments, well-known process steps, well-known structures, and well-known techniques have not been specifically described in order to avoid obscuring the present invention.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, includes and/or comprising means not excluding the presence or addition of one or more other components, steps and/or actions other than the stated components, steps and/or actions. use it as And, “and/or” includes each and every combination of one or more of the recited items.

In addition, the embodiments described herein will be described with reference to perspective, cross-sectional, side, and/or schematic views that are ideal illustrative views of the present invention. Accordingly, the form of the illustrative drawing may be modified due to manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in the form generated according to the manufacturing process. In addition, in each of the drawings shown in the embodiment of the present invention, each component may be enlarged or reduced to some extent in consideration of convenience of description.

Hereinafter, a quick coupler with a safety device according to an embodiment of the present invention will be described in detail based on the accompanying exemplary drawings.

1 is a perspective view of a quick coupler equipped with a safety device according to an embodiment of the present invention,

Figure 2 is a configuration diagram showing a state in which the moving hook and the fixed hook are respectively locked in the quick coupler equipped with a safety device according to an embodiment of the present invention, Figure 3 is a quick coupler equipped with a safety device according to an embodiment of the present invention In , it is a configuration diagram showing a state in which the movable hook and the fixed hook are opened, respectively.

In addition, FIG. 4 is a configuration diagram showing a state in which the fixed hook is locked in an open state of the movable hook in the quick coupler having a safety device according to an embodiment of the present invention.

1 to 4, the quick coupler 100 with a safety device according to an embodiment of the present invention is installed on the arm 10 of the excavator, and the fixing hook 130 is integrally formed at one end. It is provided, and the other end is provided with a main body 110 in which a rotatably movable hook 120 is installed, and the fixing pin of the attachment is installed on the main body 110 to rotate the movable hook 120 to the arm 10 . It may be configured to include a driving unit 140 for coupling.

In addition, the quick coupler 100 having a safety device according to an embodiment of the present invention, when the driving unit 140 does not exert its proper function, a safety device for maintaining the coupling state of the fixing pin installed on the fixing hook 130 It may be configured to further include a.

For reference, the fixing pin coupled to the movable hook 120 will be referred to as a first fixing pin 122 , and the fixing pin coupled to the fixing hook 130 will be referred to as a second fixing pin 132 . It should be noted that the first fixing pin 122 and the second fixing pin 132 are made of a pair connected to one attachment.

The quick coupler 100 with a safety device according to an embodiment of the present invention, as shown in FIG. 2 , when the rod 142 of the cylinder constituting the driving unit 140 is extended, the rod 142 of the driving unit 140 . ) pushes the movable hook 120 to the state in which the first fixing pin 122 is restrained, and at the same time, the driving unit 140 rotates the link unit 200 while being pushed backward. of the safety key 210 is rotated by the link unit 200 so that the fixing hook 130 restrains the second fixing pin 132 .

Thereafter, as shown in FIG. 3 , when the rod 142 is inserted into the cylinder constituting the driving unit 140 by the operator's manipulation, the movable hook 120 is rotated in the reverse direction and the attachment from the quick coupler 100 is performed. is converted to a state where it can be hacked.

Accordingly, when the rod 142 is inserted into the cylinder constituting the driving unit 140 , the movable hook 120 is rotated inside the main body 110 , and the first fixing pin 122 of the attachment and the movable hook 120 are caught. , the coupling is released, and at the same time, the safety device is also caught on the fixing hook 130 and the binding force on the coupled second fixing pin 132 is released, so that the replacement of the attachment can be performed.

As described above, in the cylinder constituting the driving unit 140 , the end of the rod 142 is rotatably coupled with the movable hook 120 , and the rear end of the cylinder is axially installed with respect to the main body 110 by the shaft rod 20 . It consists of a structure coupled to be connected to the link portion 200 that is rotated by a predetermined angle by the shaft rod (20).

Here, the upper side of the link unit 200 is coupled to the body 110 by the shaft rod 20 , and the lower side thereof is coupled to the rear end of the cylinder constituting the driving unit 140 , the driving unit 140 . As the rod 142 of the cylinder forming is extended or inserted, the link portion 200 is rotated with the shaft rod 20 as a starting point.

Brackets are formed on both sides of the rear end of the link unit 200 , and a safety key 210 may be rotatably coupled to the bracket, at this time the safety key 210 is one side by a coil spring 220 . It is given a force that rotates in the same direction.

That is, the safety key 210 is given a force to rotate inward of the main body 110 as shown in FIG. 3 in a state in which external force is not applied by the coil spring 220 , and thus the second fixing pin 132 . Interference does not occur, and the operation relationship thereof will be described in detail later.

On the other hand, when the position of the arm 10 is adjusted as shown in FIG. 4 so that the movable hook 120 is in a horizontal state with the fixed hook 130 or is located on the upper side, the attachment and the attachment coupled to the attachment The second fixing pin 132 moves as much as the clearance by the weight of the bucket or the like, so that the interference with the safety key 210 occurs, so that the release of the jam does not occur, and the operation relationship thereof will also be described in detail later.

The operating relationship of the quick coupler 100 having a safety device that can be configured as described above will be described once again.

First, as shown in FIGS. 2 and 3 , the movable hook 120 receives and fixes the first fixing pin 122 , and the fixing hook 130 receives and fixes the second fixing pin 132 . In the state, the rod 142 of the cylinder constituting the driving unit 140 is extended to push the movable hook 120 .

In this way, as the rod 142 of the cylinder constituting the driving unit 140 is extended, the rear end side of the cylinder is also pushed to the rear, and the link unit 200 is based on the shaft rod 20 as shown in FIG. 2 . by rotating to the lower side of the link unit 200 is also pushed to the rear.

Accordingly, the link unit 200 rotates the safety key 210 to interfere with the second fixing pin 132 that is received and fixed by the fixing hook 130 , so that the second fixing pin ( 132) is also locked.

That is, the link unit 200 pushes the safety key 210 with a greater force than the elastic force of the coil spring 220 , so that the safety key 210 rotates to cause interference with the second fixing pin 132 . Thus, the second fixing pin 132 of the fixing hook 130 is in a locked state.

In this state, when the operator wants to separate the attachment to replace the bucket from the quick coupler 100, as shown in FIG. 3, by applying an operation signal to the cylinder constituting the driving unit 140, the cylinder rod Let (142) contract.

In this way, when the rod 142 of the cylinder constituting the driving unit 140 is inserted and contracted, the movable hook 120 is rotated to release the jam on the first fixing pin 122, and at the same time, the rear end side of the cylinder In addition, as it moves forward, the link unit 200 rotates based on the shaft rod 20 so that the lower portion of the link unit 200 is also pulled forward.

Accordingly, the link unit 200 is released from contact with the safety key 210 , and the safety key 210 is retracted into the body 110 while returning to its original state by the elastic force of the coil spring 220 . As a result, the interference with the second fixing pin 132 is released, and the locking state with respect to the second fixing pin 132 of the fixing hook 130 is released.

That is, the quick coupler 100 according to the embodiment of the present invention, as shown in FIGS. 2 and 3 , the movable hook 120 is located below the fixed hook 130 as compared to the movable hook 120 . and the locking of the first fixing pin 122 and the second fixing pin 132 with respect to the fixing hook 130 can be released.

On the other hand, when the movable hook 120 is positioned above the fixed hook 130 by adjusting the position of the arm 10, the first fixing pin 122 and the first fixing pin 122 by the weight of the bucket and the attachment such as an excavator. As the second fixing pin 132 moves downward, the safety key 210 is restricted from returning to its original state by the elastic force of the coil spring 220 due to the interference of the second fixing pin 132 , 2 It blocks the fixing pin 132 from being separated from the fixing hook 130 .

Therefore, in the quick coupler 100 with a safety device according to an embodiment of the present invention, the locking state of the fixed hook 130 and the movable hook 120 is released only at a position where the attachment is not separated from the quick coupler 100, At a position where the attachment is separated from the quick coupler, the fixing hook 130 is maintained in a locked state, so that the risk of a safety accident can be eliminated.

For example, when the driving unit 140 is broken or damaged and cannot function properly, the movable hook 120 is released from the binding force on the first fixing pin 122, at this time as shown in FIG. Similarly, when the movable hook 120 is positioned on the lower side compared to the fixing hook 130 , the second fixing pin 132 is a bucket, etc. even if the safety key 210 is intermittent with the second fixing pin 132 is released. By not coming out of the fixing hook 130 by the weight of the chair, the bucket such as an excavator can be prevented from being separated from the quick coupler 100, the occurrence of a safety accident can be suppressed.

However, on the contrary, as shown in FIG. 4 , in a state in which the movable hook 120 is located higher than the fixed hook 130 , the driving unit 140 is broken or damaged and does not perform its functions, so the movable hook 120 . When the binding force on the first fixing pin 122 is released, the second fixing pin 132 also freely falls with respect to the fixing hook 130 by the weight of the bucket, etc. There may be a risk of safety accidents.

However, in the present invention, the second fixing pin 132 accommodated in the fixing hook 130 is interrupted by the safety key 210 which is given a force to rotate in one direction by the coil spring 220 , so that of the attachment By limiting the separation, it is possible to dispel the fear of safety accidents as described above.

That is, when the movable hook 120 is positioned above the fixing hook 130, the first fixing pin 122 and the second fixing pin 132 forming an attachment by the weight of the bucket or the like are downwardly directed. It will move as much as the distance.

Accordingly, the second fixing pin 132 moves in a direction coming out of the fixing hook 130 , so that a part of the second fixing pin 132 is in contact with the safety key 210 so that the safety key 210 is a coil spring. It is prevented from returning to the original position by the elastic force of 220, the second fixing pin 132 is maintained in a locked state by the fixing hook 130 is to limit the separation of the attachment.

As such, in the quick coupler 100 having a safety device according to an embodiment of the present invention, in a state in which the arm 10 is inclined to a position where a bucket or the like is free to fall due to its own weight, the fixing hook 130 is removed. 2 Maintaining the locking state with respect to the fixing pin 132, and only in a state where the arm 10 is tilted to a position where the bucket and the like do not freely fall due to its own weight, the fixing hook 130 is connected to the second fixing pin 132. By releasing the lock state for the , even if a malfunction of the operator or the failure of the driving unit 140 occurs, the effect of being able to dispel the concern of a safety accident due to the fall of the bucket or the like can be provided.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

10: arm 20: shaft rod
100: quick coupler 110: body
120: movable hook 122: first fixing pin
130: fixing hook 132: second fixing pin
140: driving unit 142: rod
200: link unit 210: safety key
220: coil spring

Claims (5)

a body having a fixed hook integrally provided at one end and a rotatably movable hook installed at the other end;
a pair of fixing pins engaged with the movable hook and the fixing hook, respectively;
a driving unit installed on the main body to engage or release any one of the fixing pins among the pair of fixing pins to be engaged with the movable hook as the movable hook is rotated;
a link unit connected to one end of the driving unit and rotated by a predetermined angle by the operation of the driving unit and moved by a predetermined interval; and
When the main body is positioned in a state where the pair of fixing pins are inclined at an inclination that does not allow free fall due to the weight of the bucket, the other fixing pin disposed on the fixing hook according to the movement of the link part When the locking is released and the main body is positioned in a state where the pair of fixing pins are inclined at an inclination in which a free fall is achieved by the weight of the bucket, the locking of the other fixing pin disposed on the fixing hook is performed. A quick coupler with a safety device comprising a safety key to allow retention.
The method of claim 1,
The link unit,
The upper side is axially installed with respect to the main body by a shaft,
As one end of the driving unit is connected and coupled to the lower side thereof, the lower side is rotated by a predetermined angle based on the shaft by the driving of the driving unit, and the quick with a safety device characterized in that movement is made at a predetermined interval. coupler.
3. The method of claim 2,
On one side of the link part,
A pair of brackets are installed,
A quick coupler with a safety device, characterized in that the safety key is coupled by a coil spring with respect to the pair of brackets to receive a rotational force in one direction.
4. The method of claim 3,
The safety key is
When the main body is positioned in a state in which the pair of fixing pins are tilted at an inclination so that free fall is not achieved due to the weight of the bucket, the interference with the link part is released according to the movement of the link part,
A quick coupler with a safety device, characterized in that the intermittent with respect to the second fixing pin is released by rotating inside the body by the elastic force of the coil spring.
4. The method of claim 3,
The safety key is
When the main body is positioned in a state where the pair of fixing pins are inclined at an inclination for free fall due to the weight of the bucket,
As the second fixing pin is moved as much as the clearance in the fixing hook and contact is generated, it is not rotated inside the body by the elastic force of the coil spring, and the interruption to the second fixing pin is maintained. Quick coupler with safety device.

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