KR20190135320A - Quick Coupler - Google Patents

Abstract

The present invention relates to a quick coupler, and more specifically, is easy to manufacture and maintain as to the number of components is reduced and the structure is simplified by comprising: a body; a fixing hook provided on the body to which a first coupling pin of an attachment is fitted; a hitch rotationally installed on the body to lock or unlock the first coupling pin together with the fixing hook; an actuator for rotating the hitch; a movable hook rotationally installed on the body and configured to lock or unlock a second coupling pin of the attachment on the opposite side of the fixing hook; and a cylinder for rotating the movable hook.

Description

Quick Coupler {Quick Coupler}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupler, and more particularly, to a quick coupler mounted on the boom tip of an excavator so that the attachment can be quickly and easily replaced according to a work type.

In general, heavy equipment used in construction sites or civil engineering sites, for example, excavators are not only digging using buckets, but also crushing and reinforcing concrete buildings using crushers, and rock using breakers. And various types of attachments to replace various attachments depending on the application, such as concrete destruction work, scrap and rock transportation using grab, vertical shaft and water and sewage construction foundation work using clamshell bucket. It is supposed to be.

The attachment is usually combined with a structure that can be mounted and removed from the excavator's boom so that it can be replaced according to the purpose of the work.In recent years, a quick coupler has been developed to install a separate coupler on the excavator's boom and easily attach the attachment. It is widely used.

That is, the operator of the excavator can automatically perform the operation of coupling or detaching attachments such as buckets or breakers to the quick coupler mounted at the tip of the boom by operating the boom operating lever in the driver's seat.

One of such quick couplers is described in Korean Patent No. 10-1542226. The quick coupler described in Korean Patent No. 10-1542226 has a body, a fixing hook provided on one side of the lower part of the body, and pivotable to the body. A fixed side hitch which is installed to hold the engagement pin of the attachment together with the fixed hook, a movable hook which is rotatably installed on the other side of the lower part of the body, and which is rotatably installed on the body and is further connected to the attachment A movable side hitch for holding a coupling pin, and a cylinder and other various parts installed inside the body to operate the movable hook.

However, this quick coupler has a large number of parts constituting the product, and because there are moving parts interlocked with each other like the movable hook and the fixed side hitch, its structure is complicated and difficult to assemble and maintain, and wear or damage of each part There is a problem with a high probability of failure.

KR 10-1542226

The present invention has been made to solve the above problems of the prior art, the object of the present invention is to provide a quick coupler having a simple structure by reducing and simplifying the number of components.

In addition, the object is to provide a quick coupler that can simplify the structure and reduce the wear or damage of the components by configuring the components to operate independently without interlocking movement.

Quick coupler according to the present invention for solving the above problems is the body; A fixing hook which is provided on the body and into which the first coupling pin of the attachment is fitted; A hitch rotatably installed on the body to lock or unlock the first coupling pin together with the fixing hook; An actuator for rotating the hitch; A movable hook rotatably mounted to the body and configured to lock or unlock the second coupling pin of the attachment on the opposite side of the fixed hook; It is configured to include; a cylinder for rotating the movable hook.

Here, the hitch and the shaft is installed across the body; It is rotated about the shaft, the lower side is provided with an opening and closing surface for opening and closing the opening portion of the fixed hook, and the upper surface is provided with a pressing surface pressed by the actuator, the body with an insertion groove formed next to the pressing surface and ; It is installed in the insertion groove while surrounding the shaft, the return spring for providing an elastic force to rotate the body to the outside.

And, the body is provided with a rotation suppression plate to prevent the body rotates outward a certain angle, to prevent the outer separation of the first coupling pin inserted into the fixing hook.

In addition, the upper side of the hitch is provided with a spring support plate for supporting the upper end of the return spring is supported by the bottom surface of the insertion groove.

Quick coupler of the present invention configured as described above has the advantage of easy manufacturing and maintenance by reducing the number of components and simplifying the structure.

In addition, since the hitch and the movable hook for locking or unlocking the first and second coupling pins of the attachment are independently operated by separate actuators and cylinders, there is an advantage that the structure is simplified because there are no parts for interlocking with each other.

In addition, since the actuator directly pushes and rotates the body, the pressing force provided by the actuator is not lost and is used for all the rotation of the body, and when the actuator is operated, the body does not delay and reacts directly to the first coupling pin of the attachment. There is an advantage that can be quickly locked or unlocked.

In addition, when the body of the hitch is rotated outward by the restoring force of the return spring, the first coupling pin is locked in the fixed hook, so that energy efficiency is improved because there is no need to supply power to operate the actuator in the long time work using the attachment. There is an advantage.

1 and 2 are a perspective view showing a quick coupler according to the present invention.
3 and 4 are views showing the interior of the quick coupler according to the present invention.
5 and 6 show a hitch of the quick coupler according to the present invention.
7 is a view showing the operation of the hitch of the quick coupler according to the present invention.

Hereinafter, embodiments of the quick coupler according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view showing a quick coupler according to the present invention, Figures 3 and 4 is a view showing the interior of the quick coupler according to the present invention.

5 and 6 show a hitch of the quick coupler according to the present invention, and FIG. 7 shows a hitch of the quick coupler according to the present invention.

The quick coupler according to the present invention includes a body 10, a fixing hook 20 provided at one side of the body 10, a hitch 30 provided at an upper side of the fixing hook 20, and the hitch ( The actuator 40 which operates 30, the movable hook 50 provided in the other side of the said body 10, and the cylinder 60 which operates the said movable hook 50 are comprised.

The body 10 is connected to both ends of the front plate 11 and the rear plate 12 which are disposed to face each other, the reinforcement plate 13 is fixed by a method such as welding, one side reinforcement plate 13 The moving hook 13a is installed in the container so as to be easy to move during transportation.

The body 10 includes a front plate 11 and a rear plate 12 disposed to face each other, and a reinforcement plate 13 fixed to the both ends of the front and rear surface plates 11 and 12 by welding or the like. It consists of two connecting rods 14 installed across the front plate 11 and the back plate 12.

The reinforcing plate 13 is provided with a moving hook 13a for easy movement during transportation.

The fixing hook 20 is provided in the body 10 is fitted with a first coupling pin (P1) provided in the attachment (attachment), such as a bucket, tongs or brakes.

The fixed hook 20 is formed in the shape of the hook in the bottom right of the body 10 in the drawing concave. Therefore, the right end of the fixing hook 20 is opened and the first coupling pin P1 of the attachment is inserted through the opened portion.

The hitch 30 is rotatably installed on the body 10 to lock or unlock the first coupling pin P1 of the attachment together with the fixing hook 20.

That is, the hitch 30 opens the inlet portion of the fixing hook 20 so that the first coupling pin P1 can be inserted into the fixing hook 20, or the opening of the fixing hook 20 is opened. The part is closed to prevent the first coupling pin P1 inserted into the fixing hook 20 from being separated out of the fixing hook 20.

The hitch 30 includes a shaft 31, a body 32 penetrating by the shaft 31 and rotating about the shaft 31, and a return spring 33 installed on the body 32. It is composed.

The shaft 31 is a rod of a cylindrical shape that is installed across the body 10, both ends of which are installed on the front plate 11 and the rear plate 12, respectively.

The body 32 is penetrated in the front-rear direction by the shaft 31, the opening and closing surface 32a is provided on the lower side, and the pressing surface 32b is provided on the upper side, and is inserted next to the pressing surface 32b. The groove 32c is formed.

The opening and closing surface 32a is a flat inclined surface facing the open inlet portion of the fixing hook 20, and opens and closes the opening portion of the fixing hook 20 by the rotation of the body 32.

The pressing surface 32b is a flat surface pressed by the actuator 40. When the pressing surface 32b is pressed by the actuator 40 and pushed, the body 32 rotates with the shaft 31 as the rotation axis. Done. At this time, the shaft 31 does not rotate, only the body 32 rotates around the shaft 31. That is, the actuator 40 directly presses the body 32 to directly rotate the body 32.

The pressing surface 32b is preferably disposed vertically with the actuator 40 to receive the force vertically from the actuator 40 in that the force is efficiently used without wasting the force provided by the actuator 40.

In this respect, if the pressing surface 32b is recessed inwardly to have a constant curvature, even when the body 32 rotates and the pressing surface 32b is rotated little by little, the pressing surface 32b is the actuator 40. The force acting from the actuator 40 by keeping the push rod perpendicular to the push rod is continuously applied to the pressing surface 32b.

The insertion groove 32c is a portion formed in a recessed depth at a predetermined depth in the middle of the body 32, and a locking protrusion 32d protrudes from the bottom surface of the insertion groove 32c.

The locking projection 32d supports one end of the return spring 33 and serves to hold one end of the return spring 33 when the body 32 rotates by the pressure of the actuator 40. Do it.

The return spring 33 is installed in the insertion groove 32c while surrounding the shaft 31. The return spring 33 provides an elastic force to the body 32 so that the body 32 rotates outward, thereby providing the first coupling pin P1 of the attachment. ) Is locked in the fixed hook (20).

The return spring 33 has a lower end supported by the bottom surface of the insertion groove 32c, and the upper end supported by a spring support plate 18 provided above the hitch 30. Thus, the return spring 33 is compressed or decompressed between the bottom surface of the insertion groove 32c and the spring support plate 18.

On the other hand, the body 10 is provided with a rotation inhibiting plate 16 to prevent the body 32 that rotates by a pressing force of the actuator 40 to rotate more than a predetermined angle outward as described above. When the body 32 rotates outward by a predetermined angle, the opening part of the fixing hook 20 is opened, and the first coupling pin P1 inserted into the fixing hook 20 is separated to the outside. By installing the rotation suppression plate 16 so that the 32 does not rotate more than a predetermined angle outward, the outer separation of the first coupling pin P1 inserted into the fixing hook 20 is prevented.

The actuator 40 is to rotate the hitch 30 by applying a force to the hitch 30, it may be configured as a cylinder, such that the push rod of the cylinder advances the pressing surface 32b of the body 32 The body 32 is rotated by pressing).

The movable hook 50 is rotatably installed on the body 10, and locks or unlocks the second coupling pin P2 of the attachment on the opposite side of the fixed hook 20.

The movable hook 50 is the end portion is rotatably connected to the push rod end of the cylinder 60 through the first pivot pin 51, the middle portion is the body 10 by the second pivot pin 52 Is rotatably connected. Accordingly, when the push rod of the cylinder 60 moves forward and backward, the movable hook 50 rotates clockwise or counterclockwise about the second pivot pin 52.

On the other hand, the lower side of the body 10 in more detail the coupling pin support plate 15 is installed on the lower side of the body 10 facing the movable hook 50. Therefore, when the movable hook 50 rotates toward the coupling pin support plate 15, the second coupling pin P2 of the attachment is constrained between the movable hook 50 and the coupling pin support plate 15.

And, the locking pin 17 is installed on the body 10. The locking pin 17 is installed so that both ends penetrate the front plate 11 and the rear plate 12, respectively, and is inserted into the upper surface portion of the movable hook 50 so that the movable hook 50 rotates in any direction. Do not do it. Therefore, when using the quick coupler of the present invention, the locking pin 17 is pulled out from the body 10, and when the quick coupler is not used, the locking pin 17 is inserted into the body 10.

As described above, the cylinder 60 is pivotally connected to the end of the movable hook 50 to pivot the movable hook 50.

Looking at the operation process of the quick coupler according to the present invention configured as described above are as follows.

To attach the attachment to the quick coupler of the present invention, the movable hook 50 and the hitch 30 must be kept open. To this end, the push rod of the cylinder 60 moves backward to make the movable hook 50 rotate counterclockwise, and the push rod of the actuator 40 moves forward to pressurize the body 32 of the hitch 30. By pressing the surface 32b, the body 32 must be completely rotated into the body 10 and made into a state.

In this state, the operator inserts the first coupling pin P1 of the attachment into the fixing hook 20 through the boom operation of the excavator, and then reverses the push rod of the actuator 40 to the restoring force of the return spring 33. The body 32 of the hitch 30 is rotated in the counterclockwise direction is blocked by the rotation suppression plate 16 to stop the rotation to block the open inlet portion of the fixing hook 20.

As a result, the first coupling pin P1 of the attachment inserted into the fixing hook 20 is restrained inside the fixing hook 20 and cannot be separated out.

The first coupling pin P1 of the attachment is constrained by the fixing hook 20 and the hitch 30 in the same manner as above, and the second coupling pin P2 of the attachment connects the movable hook 50 to the coupling pin support plate 15. Turn to) to restrain.

That is, when the push rod of the cylinder 60 is advanced, the movable hook 50 is rotated counterclockwise around the second pivot pin 52, and the second coupling pin P2 inserted therein is Pushed by the movable hook 50 is provided between the coupling pin support plate 15 and the movable hook 50.

As a result, the second coupling pin P2 of the attachment inserted between the movable hook 50 and the coupling pin support plate 15 is restrained and cannot be separated outward.

10: Body 11: Front Panel
12: backplane 13: gusset
13a: mobile hook 14: connecting rod
15: coupling pin support plate 16: rotation suppression plate
17: locking pin 18: spring support plate
20: fixed hook 30: hitch
31: shaft 32: body
32a: opening and closing surface 32b: pressing surface
32c: Insertion groove 32d: Jamming protrusion
33: return spring 40: actuator
50: movable hook 51: first pivot pin
52: second pivot pin 60: cylinder

Claims (4)

Body 10;
A fixing hook 20 provided on the body 10 to which the first coupling pin P1 of the attachment is fitted;
A hitch 30 rotatably installed on the body 10 to lock or unlock the first coupling pin P1 together with the fixing hook 20;
An actuator 40 for rotating the hitch 30;
A movable hook (50) rotatably installed on the body (10), for locking or unlocking the second coupling pin (P2) of the attachment on the opposite side of the fixed hook (20);
And a cylinder (60) for rotating the movable hook (50). The method according to claim 1,
The hitch 30 includes a shaft 31 installed across the body 10;
The pressing surface 32b which rotates about the shaft 31 and is provided with an opening / closing surface 32a for opening and closing the opening portion of the fixing hook 20 at the lower side and pressurized by the actuator 40 on the upper side. It is provided, and the body 32 is formed with an insertion groove (32c) next to the pressing surface (32b);
And a return spring (33) installed in the insertion groove (32c) surrounding the shaft (31) to provide an elastic force to rotate the body (32) outward. The method according to claim 2,
The body 10 is provided with a rotation suppression plate 16 to prevent the body 32 from rotating outwards by a predetermined angle, the first coupling pin (P1) of the inserted into the fixing hook (20) Quick coupler, characterized in that prevents the departure. The method according to claim 2,
Quick coupler, characterized in that the spring support plate (18) for supporting the upper end of the return spring (33) is supported by the bottom surface of the insertion groove (32c) on the upper side of the hitch (30).

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