KR20160067458A - Quick coupler for construction machinery having a safety device - Google Patents

Abstract

The present invention relates to a quick coupler. The present invention relates to a clamping device comprising a pair of frames provided at a predetermined interval on both sides in a plate shape, a fixing hook for engaging or disengaging a work mechanism from a quick coupler at a lower side of the frame, And a hydraulic cylinder for operating the rotating hook between the fixed hook and the rotating hook, wherein the quick coupler is fitted to an outer peripheral surface of the hydraulic cylinder, And a coil spring for controlling the retraction operation and preventing the hydraulic cylinder including the cylinder rod from escaping in the fixed hook direction. According to the present invention, in addition to the check valve having the hydraulic pressure in the hydraulic cylinder, a separate coil spring is provided in the hydraulic cylinder to provide a double safety structure so that the hydraulic cylinder can be prevented from escaping even if the check valve is lost.

Description

QUICK COUPLER FOR CONSTRUCTION MACHINERY HAVING A SAFETY DEVICE <br> <br> <br> Patents - stay tuned to the technology QUICK COUPLER FOR CONSTRUCTION MACHINERY HAVING A SAFETY DEVICE

The present invention relates to a quick coupler, and more particularly, to a quick coupler that includes a check valve having a hydraulic pressure in a hydraulic cylinder, and a separate coil spring in a hydraulic cylinder to provide a double safety structure, To a quick coupler which prevents a breakaway.

An excavator, also known as a "forklift," is a device equipped with a rocking arm that can be moved by a track or a wheel, the driver's seat is rotated in all directions, and the car is moved up and down around the driver's seat.

The excavator is constructed so that equipment such as a bucket or rock drill is installed at the tip of the rock band. Therefore, the work of using the excavator is accompanied with the work of selecting and replacing the equipment that matches the characteristics of the work. For this reason, it is common to install a quick coupler which can easily install or separate various equipments at the end of a bar of an excavator.

Prior art publication Utility Model No. 20-2013-0024376 relates to a quick coupler for an excavator that is configured to automatically operate a safety pin used to prevent a detachable hook from being unfastened while the equipment is engaged.

In connection with this prior art, the conventional quick coupler relies solely on the check valve of the hydraulic cylinder to fasten the fixed hook and the pivot hook, and when the function of the check valve is lost because there is no additional safety device, There is a problem that the fixing hook and the rotation hook are disengaged from each other.

Therefore, a technique for solving the above-described problems is required.

On the other hand, the background art described above is technical information acquired by the inventor for the derivation of the present invention or obtained in the derivation process of the present invention, and can not necessarily be a known technology disclosed to the general public before the application of the present invention .

In an embodiment of the present invention, a separate safety coil spring is provided in a hydraulic cylinder in addition to a check valve holding a hydraulic pressure in a hydraulic cylinder, thereby preventing the hydraulic cylinder from being broken even if the check valve is lost There is purpose in.

In addition, an embodiment of the present invention adopts a simple structure that adds a coil spring to a narrow space in a quick coupler to provide a hydraulic pressure of a hydraulic cylinder, thereby safely and continuously maintaining the fastening state of the rotating hook and the fixing hook There is purpose in.

According to an embodiment of the present invention, energy is stored as the coil spring is compressed when the cylinder rod is retracted, and the oil pressure of the hydraulic cylinder is increased as the coil spring, which was compressed when the cylinder rod is advanced, is expanded, So that the fastening speed is improved and the workability is remarkably improved.

Further, according to one embodiment of the present invention, by adding a coil spring in the structure of the quick coupler made of a check valve, the structural safety of the quick coupler is improved, so that even if the hydraulic cylinder can not exhibit its function, And to prevent human accidents that may occur in the future.

According to a first aspect of the present invention, there is provided, as a technical means for achieving the above-mentioned technical object, a pair of frames provided at predetermined intervals on both sides in a plate shape, and a work mechanism provided on a lower side of the frame, A quick coupler comprising a fixed hook for engaging or disengaging a coupling hook, a rotating hook which is pivoted at a predetermined angle on the other side of the lower side of the frame, and a hydraulic cylinder for operating the rotating hook between the fixed hook and the rotating hook, The coupler includes a coil spring fitted to the outer circumferential surface of the hydraulic cylinder to control the advancing and retracting operation of the hydraulic cylinder and preventing the hydraulic cylinder including the cylinder rod from escaping in the fixed hook direction.

According to any one of the above-mentioned objects of the present invention, there is provided a double safety structure in which a separate coil spring is provided in a hydraulic cylinder in addition to a check valve holding a hydraulic pressure in a hydraulic cylinder, It is possible to prevent the dislodgement.

Further, according to any one of the means for solving the problems of the present invention, by adopting a simple structure in which a coil spring is added to a narrow space in the quick coupler, the hydraulic pressure of the hydraulic cylinder is provided, It can be maintained continuously.

According to any one of the means for solving the problems of the present invention, energy is stored as the coil spring is compressed when the cylinder rod is retracted, and the oil pressure of the hydraulic cylinder is increased as the coil spring, So that the fastening speed of the rotating hook can be improved and the workability can be improved remarkably.

Further, according to any one of the means for solving the problems of the present invention, by adding the coil spring in the structure of the quick coupler made up of the check valve, the structural safety of the quick coupler can be improved and even if the hydraulic cylinder can not exhibit its function, It is possible to prevent human accidents that may occur in the future.

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

1 is a plan view of a quick coupler according to an embodiment of the present invention with one side frame removed.
2 is an enlarged view of a hydraulic cylinder of a quick coupler according to an embodiment of the present invention.
3 is a view showing a rotating hook, a link, and a fixing hook of the quick coupler according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes a case where it is "directly connected". Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

First, let's explain the basic structure of the quick coupler.

1 is a plan view of a quick coupler according to an embodiment of the present invention with one side frame removed. Prior to describing the quick coupler 100, the upper end of the quick coupler 100 defines a portion connected to the excavator, and the lower end of the quick coupler 100 defines a portion where the work tool (attachment) is attached and detached.

1, a frame 10 is provided at the upper end of the quick coupler 100 and two frame holes a are formed in the frame 10 so as to be symmetrical with each other. The two iron pins can be fixed.

On the other hand, the quick coupler 100 is provided with a structure capable of coupling the attachment. In order to swiftly exchange various attachments such as a bucket, a crusher or a breaker, the quick coupler 100 has a structure corresponding to two front- A hydraulic cylinder 13 having a hook 11 and a pivoting hook 12 and a cylinder rod 132 for causing an operation of the pivoting hook 12 can be provided therebetween.

In the quick coupler 100, the front end of the cylinder rod 132 of the hydraulic cylinder 13 is connected to the rotating hook cylinder shaft 1 of the rotating hook 12, and the forward and backward movement of the cylinder rod 132 The rotating hook 12 can move. The pivoting hook 12 can be moved around the pivoting hook hinge shaft 2 formed through the pivoting hook 12 while being fixed to the frame 10. [

When the cylinder rod 132 of the hydraulic cylinder 13 is advanced and retracted, the rotating hook 12 disposed at the lower end of the rotating hook hinge shaft 2 is rotated in the left and right direction have.

Hereinafter, a quick coupler according to an embodiment of the present invention will be described in more detail.

As shown in FIG. 1, a frame hole (a) is formed on the upper end of the frame 10 of the quick coupler 100. The frame hole (a) is for the boom bar of the excavator and the boom bar operated by the hydraulic cylinder 13 for coaxial and fastening. It is well known that another frame (not shown) corresponding to the frame hole a of the frame 10 A frame hole corresponding to the frame hole is formed and two frame iron rods penetrating therethrough are formed and the boom rods having the hydraulic cylinder 13 emerging from the tip of the boom rods and the tip of the boom rods are respectively designed to be engaged and operated .

A hydraulic cylinder 13 having a cylinder rod 132 is provided between the fixed hook 11 and the rotating hook 12 to be engaged with the front pin and the rear pin of the attachment at the lower end of the quick coupler 100, . The cylinder rod 132 of the hydraulic cylinder 13 can be connected to the rotating hook cylinder shaft 1. [

2 is an enlarged view of a hydraulic cylinder of a quick coupler according to an embodiment of the present invention.

2, the hydraulic cylinder 13 of the quick coupler 100 includes a cylinder body 131 in the form of a pipe, a cylinder body 131 extending from the cylinder body 131 in the direction of the rotation hook 12, A check valve 133 that is built in the cylinder body 131 to control leakage of the oil and a check valve 133 that is built in the cylinder body 131 to control the leakage of the oil, A first engagement portion 134 and a second engagement portion 134 which are diametrically different from the cylinder rod 132 and block the advancement of the coil spring 14 in the direction of the rotation hook 12, The coil spring 14 is arranged to extend through the outer circumferential surface of the cylinder body 131 with a predetermined distance from the engaging portion 134 and to make a difference in diameter from the cylinder body 131 and to retract in the direction of the fixed hook 11 And a second locking portion 135 for blocking the second locking portion 135.

The cylinder body 131 is internally provided with a cylinder nut 131a screwed to the outer circumferential surface of the cylinder rod 132 and a rear end of the cylinder nut 131a and screwed to the rear end of the cylinder rod 132, And a piston 132b for controlling the oil pressure of the rod 132. [

Meanwhile, the quick coupler 100 including the hydraulic cylinder 13 may include a coil spring 14.

The coil spring 14 is fitted on the outer circumferential surface of the hydraulic cylinder 13 to control the advancing and retreating operation of the hydraulic cylinder 13 and the cylinder rod 132 of the hydraulic cylinder 13 is disengaged in the direction of the fixed hook 11 (Pushing backward) can be prevented.

The coil spring 14 can prevent the cylinder rod 132 from being disengaged even if the function of the check valve 133 holding the hydraulic pressure in the hydraulic cylinder 13 is lost so that the attachment inserted in the rotation hook 12 is disassembled .

In addition to preventing the cylinder rod 132 from falling out, the coil spring 14 may store energy and use the energy to raise the oil pressure. That is, the coil spring 14 compresses the cylinder rod 132 when retreating, thereby storing energy, and the cylinder rod 132 is expanded at the time of advancing, thereby raising the oil pressure of the hydraulic cylinder 13, It is possible to improve the fastening speed of the screw.

The coil spring 14 is provided to provide kinetic energy to the cylinder rod 132 extending from the hydraulic cylinder 13 to prevent any disengagement of the pivoting hook 12. In other words, the coil spring 14 prevents the cylinder rod 132 from falling independently when the hydraulic cylinder 13 loses hydraulic pressure due to the loss of function of the check valve 133, so that the rotation hook 12 and the fixed hook 11 can be held in engagement with the front and rear pins of the attachment.

Meanwhile, the quick coupler 100 according to an embodiment of the present invention may further include a link 15.

3 is a view showing a rotating hook, a link, and a fixing hook of the quick coupler according to an embodiment of the present invention. 3, the link 15 is in the form of a plate extending between the fixed hook 11 and the pivot hook 12 and is disposed and pinned between the pivot hook 12 and the fixed hook 11, It is possible to prevent the fixed hook 11 from rotating in the direction of the pivot hook 12 by being moved upward by the pivot hook 12 which is rotated in accordance with the backward movement of the cylinder rod 132. [

Such a link 15 can be formed in a plate shape that gradually increases in area when it extends in the direction of the fixed hook 11 in the direction of the rotation hook 12. That is, the link 15 has a long plate shape in which a portion 15a extending in the direction of the fixed hook 11 from the tip of the direction in which the pivot hook 12 is installed has a constant width, The remaining portion 15b extending from the remaining portion, that is, the portion 15a in the direction of the fixed hook 11, can be made wider as it goes toward the fixed hook 11.

A shaft hole 15a 'connected to the fixed hook 11 may be formed on the portion 15a of the link 15. A connecting hole 15C 'connected to the auxiliary hook 11a may be formed at the upper end 15c at the upper end which is engaged with the auxiliary hook 11a in the remaining portion 15b of the link 15.

In order to withstand the force transmitted to the fixed hook 11, the link 15 preferably has a larger cross-sectional area than the portion 15a, that is, the other side to which the fixed hook 11 is coupled.

In the quick coupler 100 having such a structure, when the cylinder rod 132 is moved forward or backward by the action of hydraulic pressure flowing through the hydraulic cylinder 13, the rotating hook cylinder shaft 1 is advanced and retreated, The swing hook ring at the lower end of the swing hook 12 can be fastened to the rear pin of the attachment by causing the swing arm 12 to swing about the swing hook hinge shaft 2 in the left and right direction.

In order to fasten the attachment using the thus formed quick coupler 100, the driver is required to fasten the upper end of the quick coupler 100 to the upper end of the boom rope so as to be fastened to the two iron pins sandwiched between the frame holes a and the frame holes of the other frames symmetrical thereto The fixed hook 11 of the quick coupler 100 is first engaged with the front pin of the attachment and the rotary hook 12 is moved toward the rear pin of the attachment again by operating the boom shaft movable shaft and then the hydraulic cylinder 13 to advance the cylinder rod 132 so that the rotation hook 12 is fastened to the rear pin of the attachment.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Quick coupler 10: Frame
11: Fixing hook 12: Rotating hook
13: Hydraulic cylinder 131: Cylinder body
132: Cylinder rod 133: Check valve
134: first engaging part 135: second engaging part
14: coil spring 15: link

Claims (5)

A pair of frames provided at predetermined intervals on both sides in a plate shape; a fixing hook for engaging or disengaging the work mechanism from the quick coupler at a lower side of the frame; And a hydraulic cylinder for operating the rotating hook between the fixed hook and the rotating hook, the quick coupler comprising:
In the quick coupler,
And a coil spring fitted to the outer circumferential surface of the hydraulic cylinder to control the advancing and retracting operation of the hydraulic cylinder and preventing the hydraulic cylinder including the cylinder rod from escaping in the fixed hook direction, Quick coupler with safety device. The method according to claim 1,
In the hydraulic cylinder,
A cylinder body having a pipe shape;
A cylinder rod that advances in the direction of the rotation hook from the cylinder body or retreats in the fixed hook direction to control rotation of the rotation hook;
A check valve built in the cylinder body to control oil leakage;
A first engaging portion which forms a diameter difference on the outer circumferential surface of the front end of the cylinder rod and blocks the advancement of the coil spring in the direction of the rotation hook; And
And a second engaging portion spaced apart from the first engaging portion by a predetermined distance to form a diameter difference on an outer circumferential surface of the cylinder body to prevent the coil spring from being retracted in the direction of the fixed hook,
Wherein the coil spring comprises:
And a second fastening portion for fastening the second fastening portion to the second fastening portion. The method according to claim 1,
In the quick coupler,
Further comprising an auxiliary hook formed to be rotatable against the fixed hook, the auxiliary hook selectively fixing the work mechanism in cooperation with the fixing hook. The method of claim 3,
In the quick coupler,
And is rotated in a direction away from the fixed hook by being moved upward by the rotation hook which is rotated in accordance with the backward movement of the cylinder rod so as to rotate the auxiliary hook in a direction away from the fixed hook A double quick-attachment quick coupler for an excavator working tool, further comprising a link. 5. The method of claim 4,
The link includes:
Wherein the rear end portion of the rear end portion is spaced apart from the front end by a predetermined distance, the front end portion of the rear end portion is wider toward the fixing hook, A quick coupler with a double safety device for an excavator working tool.

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