KR102237537B1 - Quick Change Device - Google Patents

Abstract

Provided in the present invention is a quick change device, which can compensate the assembling tolerance of a hydraulic valve and the like to connect a hydraulic line even when the concentricity of the valve is dislocated, and is provided with a buffering means to improve durability. To this end, the present invention comprises: a quick coupler formed to be coupled to the end portion of an excavator's arm, and including a first hydraulic connecting unit having a flow path; and an adapter formed to be coupled to one side of an attachment, and including a second hydraulic connecting unit having a flow path connected to the first hydraulic connecting unit. Here, the first hydraulic connecting unit comprises: a first hydraulic pipe to which a flow path stretching from the excavator's arm is connected; a first valve body to which the end portion of the first hydraulic pipe is fixed; and a first hydraulic coupler formed at the end portion of the first hydraulic pipe and exposed on the outer surface of the first valve body. The second hydraulic connecting unit comprises: a second hydraulic pipe to which a flow path stretching from the attachment is connected; a second valve body to which the end portion of the first hydraulic pipe of the second hydraulic pipe is fixed; and a second hydraulic coupler which is formed at the end portion of the second hydraulic pipe, is exposed on the outer surface of the second valve body, and is coupled to the first hydraulic coupler. The second valve body comprises: a fixing valve body of a panel shape, which has one corner attached to the adapter; a moving valve body of a panel shape, which is coupled to face the fixing valve body after being spaced apart therefrom; and a buffering device formed as an elastic body to be arranged between the fixing valve body and the moving valve body.

Description

Quick Change Device {Quick Change Device}

The present invention relates to a quick change device for mounting and replacing an attachment in a construction equipment such as an excavator using a hydraulic cylinder.

In general, construction equipment using an arm such as an excavator is provided to be interchangeable with an attachment at the end of the arm so that it can be used for various purposes in a variety of work environments. The equipment for replacing the attachment is a quick change device, and in particular, the meaning of “quick” refers to a function that allows the operator to manipulate the lock and release of the coupler by adjusting the hydraulic pressure of the hydraulic cylinder without separate manual work.

The quick change device includes a quick coupler coupled to the female end of the excavator and an adapter coupled to the upper portion of the attachment and mounted or released from the quick coupler. Therefore, it has a structure in which the attachment can be coupled to the excavator arm by the coupling between the quick coupler and the adapter.

Meanwhile, in the case of equipment using hydraulic pressure, such as a crusher or a breaker among attachments, a hydraulic line must be connected from the excavator body through an arm. Conventionally, such a hydraulic connection was performed manually, but recently, a product that allows the attachment to be mechanically fastened by a quick change device and to connect the attachment to the hydraulic line of the excavator has been commercialized.

In the case of the quick change device connecting the hydraulic line, a hydraulic line is formed along the arm from the excavator body, and the end of the hydraulic line is installed on the quick coupler. In addition, the end of the hydraulic line of the attachment is installed on an adapter attached to the upper portion of the attachment, and by connecting the quick coupler and the adapter, the excavator and the hydraulic line of the attachment can be connected.

However, in order to connect the hydraulic line, the hydraulic valves must be aligned and coupled at the correct position, but there is a problem in that they cannot be properly aligned due to assembly tolerances, manufacturing tolerances, wear due to use, or deterioration of assembly properties due to use.

In addition, in the case of using equipment with high shock and vibration such as a breaker among attachments, there is a problem that the durability of the product is deteriorated because shock and vibration are transmitted to the connected hydraulic valve.

The present invention is to solve the problems of the prior art as described above, specifically, to compensate for the assembly tolerance of the hydraulic valve, etc. to provide a quick change device capable of connecting a hydraulic line even in a state where the concentricity of the valve is shifted. do.

In addition, it is an object of the present invention to provide a quick change device capable of improving durability, including a means for buffering the attachment even when an attachment having strong shock and vibration, such as a breaker, is mounted.

An embodiment of the present invention includes the following quick change device in order to solve the above problems.

The present invention is formed to be coupled to the end of the excavator arm, a quick coupler including a first hydraulic connection portion formed with a flow path; And an adapter formed to be coupled to one side of the attachment and including a second hydraulic connection part to which the first hydraulic connection part and the flow path are connected. Including, the first hydraulic connection portion, a first hydraulic pipe to which a flow path drawn from the excavator arm is connected, a first valve body to which an end of the first hydraulic pipe is fixed, and an end of the first hydraulic pipe And a first hydraulic coupler formed in and exposed to an outer surface of the first valve body, and the second hydraulic connection part includes a second hydraulic pipe to which a flow path drawn from the attachment is connected, and the second hydraulic pipe. A second valve body to which an end is fixed, and a second hydraulic coupler formed at an end of the second hydraulic pipe, exposed to an outer surface of the second valve body, and coupled to the first hydraulic coupler, The second valve body is formed of a panel-shaped fixed valve body having one edge attached to the adapter, a panel-shaped flow valve body that is spaced apart from and coupled to face the fixed valve body, and an elastic body, and the fixed valve body And a shock absorber disposed between the flow valve body.

In addition, the shock absorber is characterized in that it is elastically deformable in the thickness direction of the second valve body.

In addition, the shock absorber is characterized in that it is elastically deformable in the surface direction of the second valve body.

In addition, the fixed valve body and the flow valve body are bolted to each other by a fastening bolt, and a bolting hole formed in the fixed valve body or the flow valve body is formed to be larger than the diameter of the fastening bolt.

In addition, the shock absorber is characterized in that it is formed of a urethane material.

In addition, the shock absorber is characterized in that it comprises a surface direction shock absorber formed in a tubular shape and disposed to surround the outer surface of the second hydraulic coupler.

In addition, the shock absorber includes a thickness direction buffer part disposed between the fixed valve body and the flow valve body, and at least one of the fixed valve body and the flow valve body has a groove corresponding to an end shape of the thickness direction buffer part. It is formed, and the thickness direction buffer is characterized in that the both ends are fixed by interviewing the fixed valve body and the flow valve body.

In addition, the shock absorber is characterized in that it includes a thickness direction shock absorber extending in a direction perpendicular to the outer surface of the surface direction shock absorber.

In addition, the first hydraulic connection part is advanced by a driving cylinder installed in the quick coupler and is coupled to the second hydraulic connection part, and when the first hydraulic connection part and the second hydraulic connection part are combined, the driving cylinder may pressurize the shock absorber. Characterized in that it is elongated to a length that can be.

According to the problem solving means of the present invention as described above, various effects including the following can be expected. However, the present invention is not established when all of the following effects are exhibited.

The present invention provides a novel valve body configuration, and according to the present invention, the flow valve body flows not only in the thickness direction but also in the surface direction, so that tilting is possible. Therefore, even if the first hydraulic connection part and the second hydraulic connection part are assembled in a state where the concentricity is slightly shifted, the flow valve body is tilted and the male coupler is inserted into the female coupler to be assembled. Therefore, there is an effect of preventing oil leakage or damage to the hydraulic connection due to incomplete assembly.

In addition, by including an elastically deformable shock absorber, stress acting on the hydraulic connection portion is relieved, attachments that generate large shocks or vibrations can be used, and durability is improved.

1 is a perspective view of a quick change device according to the present invention,
Figure 2 is a side view of Figure 1,
Figure 3 is a front view of Figure 1,
Figure 4 is a rear view of Figure 1,
5 is a plan view of the quick coupler,
6 is a rear view of FIG. 5;
7 is a perspective view showing a partial configuration of a quick coupler;
8 is a perspective view showing an advanced state of the drive cylinder in FIG. 7;
9 is a perspective view of FIG. 7 viewed from another direction;
10 is a perspective view showing a partial configuration of an adapter;
11 is an exploded perspective view of a second hydraulic connection part,
12 is a side view of a second hydraulic connection.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a quick change device of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a front view of FIG. 1, FIG. 4 is a rear view of FIG. 1, FIG. 5 is a plan view of a quick coupler, and FIG. 6 is FIG. 7 is a perspective view showing a partial configuration of a quick coupler, FIG. 8 is a perspective view showing an advanced state of the driving cylinder in FIG. 7, FIG. 9 is a perspective view of FIG. 7 viewed from another direction, and FIG. 10 is a view of the adapter. A perspective view showing some configurations, FIG. 11 is an exploded perspective view of the second hydraulic connection part, and FIG. 12 is a side view of the second hydraulic connection part.

As shown in these drawings, the quick change device of the present invention includes a quick coupler 100 connected to an end of an excavator arm, and an adapter 200 connected to the upper side of the attachment, and combines the quick change and the adapter 200 Or, by releasing, the attachment is formed to be detached from the excavator. A first coupling part 110 and a second coupling part 120 are formed in the quick coupler 100, and a coupler coupling pin 222 is installed as the third coupling part 220 in the adapter 200, and the first When the second coupling part 120 is fastened to the front coupler coupling pin 222 by hooking the coupling part 110 to the rear coupler coupling pin 222 and rotating the quick coupler 100, the quick coupler 100 and the adapter This is how (200) is combined.

First, a detailed configuration of the quick coupler 100 will be described with reference to FIGS. 1 to 9. The quick coupler 100 includes a coupler upper body 101 coupled to the excavator arm and a coupler lower body 102 coupled to the adapter 200. The coupler upper body 101 and the coupler lower body 102 may be formed integrally with two side plates that are formed to extend over the front and rear and are disposed to face each other. In the central portion of the upper coupler body 101 and the lower coupler body 102, a guide protrusion 103 may be formed to protrude outward. The guide protrusion 103 serves to guide the motion trajectory of the quick coupler 100 while being inserted along the guide slot 221a to be described later. The coupler upper body 101 may be formed with an excavator coupling pin 130 to be coupled to the excavator arm, and the coupler lower body 102 may include a configuration for coupling and releasing with the adapter 200.

A fixing plate 104 is coupled to the rear of the coupler lower body 102 so that a fastening display unit 160 or a dust protector 170 to be described later can be installed. In addition, a first coupling portion 110 formed with a groove so that the rear coupler coupling pin 222 of the adapter 200 can be accommodated is formed at the rear of the coupler lower body 102, and a front coupler coupling pin 222 is formed in the front. The second coupling part 120 is formed so as to catch on. The second coupling part 120 includes a rod-shaped coupling pin 121 that is movable to the front and rear of the coupler lower body 102 by the driving cylinder 140. When the coupling pin 121 is moved to the rear, it is possible to release between the quick coupler 100 and the adapter 200, and when the coupling pin 121 is moved from the lower side of the coupler coupling pin 222 to the front, the quick coupler ( 100) and the adapter 200 are combined. The upper surface of the end of the coupling pin 121 may be formed as a curved surface as shown in the figure in consideration of the cylindrical shape of the coupler coupling pin 222. The longitudinal direction of the coupling pin and the stroke direction of the driving cylinder 140 may be arranged in the same direction, and the driving cylinder 140 is generally driven by hydraulic pressure, and the coupling pin 121 and the driving cylinder 140 are plural. It can be equipped with.

In addition, as shown in FIGS. 5 to 9, a first hydraulic connection part 150 may be formed in the central part of the lower coupler body 102. The first hydraulic connection unit 150 is coupled to the driving cylinder 140 and can be moved forward and backward together with the coupling pin as the driving cylinder 140 expands and contracts. In the drawing, a first hydraulic connection unit 150 is shown in the center of the two driving cylinders 140. The first hydraulic connection unit 150 includes a first hydraulic pipe 151 connected to a hydraulic pump or a hydraulic tank of an excavator, a first hydraulic coupler 153 formed at an end of the first hydraulic pipe 151, and a first hydraulic pressure. It includes a first valve body 152 in the form of a block fixing the outer periphery of the coupler 153. In a state in which the quick coupler 100 and the adapter 200 are coupled, one surface of the first valve body 152 is interviewed with the one surface of the second valve body of the adapter 200, and the first hydraulic pressure in which the end is disposed through one surface. As the coupler 153 and the second hydraulic coupler 252 are coupled, a hydraulic line (flow path) from the excavator to the attachment may be connected. In addition, a guide pin 154 is protruded on one surface of the first valve body 152 and a guide groove 260 corresponding to the guide pin 154 is concave formed on one surface of the second valve body. Assembly of can be guided.

Further, the coupler lower body 102 may include a fastening display unit 160. The fastening display unit 160 is configured to check whether the coupling pin 121 protrudes forward or not from the rear of the quick coupler 100. The fastening display unit 160 is installed to move together with the driving cylinder 140, and may be formed in the form of a display rod 162 coupled to the upper portion of the first valve body 152 as shown in the drawing, for example. The display rod 162 is disposed in the front and rear direction of the quick coupler 100, one end is fixed to be driven together with the driving cylinder 140, and the other end may be formed as a free end. In addition, the quick coupler 100 may be installed to appear and disengage through the display hole 161 formed through the fixing plate 104 at the rear of the quick coupler 100. Therefore, when the driving cylinder 140 is elongated, the coupling pin 121 protrudes and the display rod 162 is not visible from the rear of the quick coupler 100. On the contrary, when the driving cylinder 140 is contracted, the coupling pin 121 does not protrude. Without, the display rod 162 protrudes from the rear of the quick coupler 100 so that it can be visually confirmed. That is, the driver can check whether the quick coupler 100 is fastened in the excavator cabin through the fastening display unit 160.

In addition, a dust protector 170 may be installed on the lower body 102 of the coupler. The dust protector 170 is configured to prevent dust from entering when the first hydraulic part is not connected to the second hydraulic part. The dust protector 170 includes a cover 171 hinged to cover one surface of the first valve body 152 and an opening/closing rod 172 formed to open and close the cover 171. The opening/closing rod 172 has one end fixed to the rear (fixing plate 104 in the drawing) of the quick coupler 100, and the other end becomes a free end and is disposed through the first valve body 152. In the extended state of the cylinder, the other end of the opening and closing rod 172 does not push the inner surface of the cover 171 so that the cover 171 is in a closed state, but the other end of the opening and closing rod 172 is in a state in which the cylinder is retracted. The cover 171 may be opened by pushing the inner surface of the 171). This operation is illustrated in FIGS. 7 to 9.

In addition, the coupler lower body 102 may include a first connector 180. The first connector 180 is connected to the second connector 230 formed on the adapter 200 and may be used to control a tilt rotator or the like connected to the lower portion of the adapter 200.

In addition, a safety spring 190 may be included in the coupler lower body 102. The safety spring 190 is a means for ensuring that the coupling pin 121 always protrudes in a state in which hydraulic pressure is not applied to the quick coupler 100. Through this, even if the hydraulic pressure of the driving cylinder 140 is released while the adapter 200 is coupled, the quick coupler 100 and the adapter 200 may not be separated by the safety spring 190. However, when the quick coupler 100 is to be separated in a state in which the hydraulic pressure is broken, the operation of removing the safety spring 190 is rather cumbersome. In order to solve this problem, the present invention arranges the safety spring 190 outside the driving cylinder 140, and one end of the safety spring 190 is driven to the first hydraulic valve body, and the other end of the quick coupler 100 It was fixed in front. Furthermore, the other end of the safety spring 190 is configured to be fixed by a fixing bolt 192 and a nut 193 that are fixed through the fixing body 191. Using this structure, when the nut 193 is loosened, the fixing bolt 192 is pulled in the direction of the bolt head by the spring, and the elastic force of the spring is reduced, so that the safety spring 190 can be easily removed when necessary. There is.

Hereinafter, a detailed configuration of the adapter 200 will be described with reference to FIGS. 1 to 4 and 10 to 12. An attachment coupling part 210 is formed under the adapter 200 to be coupled to the attachment, and may be installed in the shape of a panel as shown in the drawing. A third coupling part 220 is formed on the adapter 200. The third coupling part 220 is a part that is coupled to the first coupling part 110 and the second coupling part 120, and extends upwardly to the attachment coupling part 210 and is disposed in the front and rear direction of the adapter 200. It connects the adapter side plate 221 and the adapter side plate 221 formed on both sides, and may include a coupler coupling pin 222 disposed in parallel before and after the adapter 200. When two coupler coupling pins 222 are formed as shown in the figure, the first coupling part 110 is coupled to the rear coupler coupling pin 222, and the second coupling part 120 is the front coupler coupling pin 222. ) Can be combined.

Furthermore, a guide slot 221a may be formed in the adapter side plate 221. The guide slot 221a forms a path through which the guide protrusion 103 is inserted and guided when the quick coupler 100 and the adapter 200 are coupled. After connecting the first coupling part 110, since the quick coupler 100 is rotated to connect the second coupling part 120, the guide slot 221a is favorably from the upper side to the front and lower side as shown in FIG. It is preferable to be formed in a shape. By the structure in which the guide protrusion 103 is inserted into the guide slot 221a, the quick coupler 100 and the adapter 200 can be correctly aligned before being coupled, and thus the first hydraulic connection part ( 150) or the second hydraulic connector 250 can be prevented from being damaged. In particular, the first hydraulic connection part 150 and the second hydraulic connection part 250 have a very small allowable tolerance and are arranged in a location that is prone to breakage, so that they are quick by the guide protrusion 103 and the guide slot 221a. Aligning the position of the coupler 100 is a function that greatly helps improve durability.

In addition, a second connector 230 may be installed on the coupler coupling pin 222 in front of the adapter 200, and the second connector 230 has been described above.

Further, the adapter 200 may include a second hydraulic connection part 250. The second hydraulic connection part 250 is fastened with the first hydraulic connection part 150 moved by the driving cylinder 140 to connect the hydraulic line from the excavator to the attachment. The second hydraulic connector 250 includes a second hydraulic pipe 251 to which a flow path drawn from the attachment is connected, a second hydraulic coupler 252 formed at an end of the second hydraulic pipe 251, and a second hydraulic coupler. It includes a second valve body in the form of a block fixing the outer periphery of (252). The second hydraulic coupler 252 is formed of a female coupler or a male coupler, and has a shape and function complementary to the first hydraulic coupler 153.

In particular, the second valve body will be described with reference to FIGS. 10 to 12 as follows. The second valve body is formed in a form capable of making an interview with the first valve body 152 and includes a fixed valve body 253 and a flow valve body 254 having a panel shape. One corner of the fixed valve body 253 is fixed to the adapter 200 by welding or the like, and may be supported by a reinforcing rib 255. The flow valve body 254 is disposed to face the fixed valve body 253 and is not directly fixed to the adapter 200. The second hydraulic coupler 252 is fixed through both the fixed valve body 253 and the flow valve body 254, and a shock absorber 256 is inserted between the fixed valve body 253 and the flow valve body 254 And can be fixed.

The shock absorber 256 is configured to allow the flow valve body 254 to move in all three axes of x, y, and z. That is, it is a configuration made of an elastic body capable of tilting the flow valve body 254. An example of the elastic body may be a rubber material containing urethane. The shock absorber 256 includes a surface direction buffer unit 256a that is elastically deformed in the surface direction of the flow valve body 254, and a thickness direction buffer unit 256b that is elastically deformed in the thickness direction of the flow valve body 254. can do. The surface direction buffer unit 256a may be formed in a tubular shape surrounding the outer surface of the second hydraulic coupler 252. In addition, the thickness direction buffer part 256b may be formed to protrude from one side of the surface direction buffer part 256a so as to be disposed between the fixed valve body 253 and the flow valve body 254.

Meanwhile, holes 253a and 254a are formed through the fixed valve body 253 and the flow valve body 254 so that the surface direction buffer part 256a can be inserted therethrough, and the fixed valve body 253 and/or the flow valve body Grooves 253b and 254b may be formed on the surfaces of the 254 facing each other so that both ends of the buffer portion 256b in the thickness direction may be inserted.

In addition, a bolting hole 258 is formed through the fixed valve body 253 and the flow valve body 254 to be coupled by a fastening bolt 257. In the present invention, in order to allow the flow of the flow valve body 254, any one or more bolting holes 258 of the fixed valve body 253 or the flow valve body 254 are formed larger than the diameter of the fastening bolt 257, It would be more preferable that the bolting hole 258 formed in the fixed valve body 253 is formed larger than the diameter of the fastening bolt 257 as shown in the figure.

As described above, according to the present invention, the flow valve body 254 is tilted in the correct direction even when the flow valve body 254 is tilted in the correct direction even in a state where the first hydraulic connection part 150 and the concentricity are not aligned by the configuration of the second hydraulic connection part 250. It was made to be fastened. At this time, while the flow valve body 254 is tilted, the guide pin 154 of the first hydraulic connection part is inserted into the guide groove 260 of the second hydraulic connection part, so that the two hydraulic connection parts can be more correctly aligned. In addition, as a plurality of shock absorbers 256 are arranged, even if a larger impact is applied to only a part of the second assembly according to the assembly direction, the entire flow valve body 254 is stably tilted and the hydraulic coupler can be connected.

Meanwhile, although not shown in the drawing, a sensor may be installed on the side plate of the quick coupler 100 and the adapter 200. A sensor transmitter is installed in one of the quick coupler 100 or the adapter 200, and a receiver is formed in the other, so that the distance between the quick coupler 100 and the adapter 200 can be measured using the time taken for reception. I can. Particularly, when sensors are installed on both side plates, the left and right angles between the quick coupler 100 and the adapter 200 can be measured, and the quick coupler 100 is tilted by the measured angle to control the quick coupler 100. When assembling the and adapter 200 can be assembled horizontally. This has the effect of improving durability by preventing damage due to assembly operation, and further, it can be applied to machine control (MC) or machine guidance (MG) technology. The position of the sensor may be a point adjacent to the first coupling part 110 (or the second coupling part 120) and the coupler coupling pin 222 facing it, or the guide protrusion 103 and the guide slot 221a. have.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains are capable of various modifications and variations without departing from the essential characteristics of the present invention. The scope of protection should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100 Quick coupler 101 Coupler upper body
102 Lower body of coupler 103 Guide protrusion
104 Fixing plate 110 First coupling part
120 Second coupling part 121 Coupling pin
130 Excavator coupling pin 140 Drive cylinder
150 1st hydraulic connection 151 1st hydraulic pipe
152 First valve body 153 First hydraulic coupler
154 Guide pin 160 Fastening display
161 Marking Hall 162 Marking Rod
170 Dust Protector 171 Cover
172 Opening and closing rod 173 Installation body
180 1st connector 190 Safety spring
191 Fixing body 192 Fixing bolt
193 nut
200 adapter 210 attachment joint
220 Third coupling part 221 Adapter side plate
221a Guide slot 222 Coupler coupling pin
230 2nd connector 250 2nd hydraulic connection
251 2nd hydraulic pipe 252 2nd hydraulic coupler
253 Fixed valve body 254 Flow valve body
253a, 254a hole 255 reinforcing rib
256 Shock Absorber 256a Surface Shock Absorber
256b thickness direction buffer part 257 fastening bolt
258 Bolting hole 260 Guide groove

Claims (9)

A quick coupler 100 formed to be coupled to an end of the excavator arm and including a first hydraulic connection 150 having a flow path; And
An adapter 200 formed to be coupled to one side of the attachment and including a second hydraulic connection part 250 to which the first hydraulic connection part 150 and a flow path are connected;
Including,
The first hydraulic connection unit 150 includes a first hydraulic pipe 151 to which a flow path drawn from the excavator arm is connected, a first valve body 152 to which an end of the first hydraulic pipe 151 is fixed, and , Including a first hydraulic coupler 153 formed at an end of the first hydraulic pipe 151 and exposed to an outer surface of the first valve body 152,
The second hydraulic connection part 250 includes a second hydraulic pipe 251 to which a flow path drawn from the attachment is connected, a second valve body to which an end of the second hydraulic pipe 251 is fixed, and the second It is formed at the end of the hydraulic pipe 251, is exposed to the outer surface of the second valve body, and includes a second hydraulic coupler 252 coupled to the first hydraulic coupler 153,
The second valve body includes a panel-shaped fixed valve body 253 having one edge attached to the adapter 200, and a panel-shaped flow valve body ( 254, and a shock absorber 256 formed of an elastic body and disposed between the fixed valve body 253 and the flow valve body 254,
The shock absorber 256 is formed in a tubular shape and is vertical to the outer surface of the surface direction buffer unit 256a and the surface direction buffer unit 256a disposed to surround the outer surface of the second hydraulic coupler 252 A quick change device comprising a thickness direction buffer extending in one direction.
The method according to claim 1,
The shock absorber (256) is a quick change device, characterized in that elastically deformable in the thickness direction of the second valve body.
The method according to claim 1,
The shock absorber (256) is a quick change device, characterized in that elastically deformable in the surface direction of the second valve body.
The method according to claim 1,
The fixed valve body 253 and the flow valve body 254 are bolted to each other by a fastening bolt 257,
The bolting hole 258 formed in the fixed valve body 253 or the flow valve body 254 is formed larger than a diameter of a portion of the fastening bolt 257 inserted into the bolting hole 258, and the fastening bolt ( 257) quick change device, characterized in that formed smaller than the diameter of the head.
The method according to claim 1,
The shock absorber 256 is a quick change device, characterized in that formed of a urethane material.
delete A quick coupler 100 formed to be coupled to an end of the excavator arm and including a first hydraulic connection 150 having a flow path; And
An adapter 200 formed to be coupled to one side of the attachment and including a second hydraulic connection part 250 to which the first hydraulic connection part 150 and a flow path are connected;
Including,
The first hydraulic connection unit 150 includes a first hydraulic pipe 151 to which a flow path drawn from the excavator arm is connected, a first valve body 152 to which an end of the first hydraulic pipe 151 is fixed, and , Including a first hydraulic coupler 153 formed at an end of the first hydraulic pipe 151 and exposed to an outer surface of the first valve body 152,
The second hydraulic connection unit 250 includes a second hydraulic pipe 251 to which a flow path drawn from the attachment is connected, a second valve body to which an end of the second hydraulic pipe 251 is fixed, and the second It is formed at the end of the hydraulic pipe 251, is exposed to the outer surface of the second valve body, and includes a second hydraulic coupler 252 coupled to the first hydraulic coupler 153,
The second valve body includes a panel-shaped fixed valve body 253 having one edge attached to the adapter 200, and a panel-shaped flow valve body ( 254, and a shock absorber 256 formed of an elastic body and disposed between the fixed valve body 253 and the flow valve body 254,
The shock absorber 256 includes a thickness direction shock absorber 256b disposed between the fixed valve body 253 and the flow valve body 254,
At least one of the fixed valve body 253 and the flow valve body 254 has grooves 253b and 254b corresponding to the end shape of the thickness direction buffer part 256b,
The quick change device, characterized in that both ends of the thickness direction buffer part are fixed by interviewing the fixed valve body (253) and the flow valve body (254).
delete The method according to claim 1,
The first hydraulic connection part 150 is advanced by a driving cylinder 140 installed in the quick coupler 100 and coupled to the second hydraulic connection part 250,
When the first hydraulic connection unit 150 and the second hydraulic connection unit 250 are coupled, the drive cylinder 140 extends to a length capable of pressing the shock absorber 256.

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