EP3725953B1

EP3725953B1 - Quick coupler connection system for construction machine

Info

Publication number: EP3725953B1
Application number: EP18887627.0A
Authority: EP
Inventors: Ho Chul Kim
Original assignee: Daemo Engineering Co Ltd
Current assignee: Daemo Engineering Co Ltd
Priority date: 2017-12-15
Filing date: 2018-09-12
Publication date: 2023-06-07
Anticipated expiration: 2038-09-12
Also published as: IL274644B2; WO2019117431A1; IL274644B1; EP3725953A4; EP3725953A1; IL274644A; KR101870713B1

Description

Technical Field

The present invention relates to a quick coupler connection system for a construction machine and, more particularly, to a quick coupler connection system for a construction machine in which the coupling position of an actuating rod and a connecting block is automatically adjusted so that a quick coupler main body and a heavy equipment attachment device are quickly and safely combined, in which the quick coupler main body and the attachment device can be more easily combined, a stronger connection force can be achieved, and operation noise can be reduced by combining the quick coupler main body and the attachment device in a 3-point supporting type and a pin-hook coupling type.

Background Art

In general, heavy equipment that is used at construction sites or engineering work sites, for example, an excavator is construction equipment that is widely used for a road construction, waterworks and sewer construction, basic building construction, land development construction, construction for picking earth and sand, etc. Such equipment is selectively equipped with various attachments for different purposes, depending on the purpose of the work.
It is possible to change various attachments and perform various works, depending on purposes such as a digging work that uses a bucket, a work of crushing concrete building and cutting reinforcing rods using a crusher, a work of breaking rocks and concrete, a work of carrying scrap iron and rocks using a grab, a work of digging vertical pits and construction foundations for water and sewer facilities using a clamshell bucket.
An attachment is usually detachably coupled to the arm of an excavator to be replaced, depending on purposes, and recently, a quick coupler that is coupled to the arm of an excavator and enables an attachment to be easily connected has been developed and widely used.
The quick coupler is firmly coupled to the arm and the cylinder-side push link of an excavator by two pin coupling structures on a quick change body and can fasten an attachment using a fixed hook and a moving hook.
Accordingly, a driver of an excavator couples or separates the quick coupler to or from a bucket or a breaker mounted at the end of an arm by operating a lever, so it is possible to easily handle and use attachments.
Meanwhile, the quick coupler has a safety device, for example, a safety pin to prepare for a safety accident as a measure for preventing the danger of separation of an attachment due to breakdown of a hydraulic cylinder of the quick coupler or damage to a hydraulic hose during work.
However, in order to replace an attachment such as a bucket or a breaker on the quick coupler, a worker has to manually separate a safety pin from a previously mounted attachment or fasten a safety pin after mounting a new attachment, so the work is difficult and troublesome and takes a long of time.
In the related art, there is Korean Patent No. 10-1043036, titled "Attachment coupler for heavy machinery, ensuring a complete coupling with the attachment" (registered on June 14, 2011 ). The attachment coupler includes: a coupler body coupled to an end of an arm of a heavy construction vehicle; a fixed hook fixed to the coupler body to be fastened to one of coupling pins facing an attachment; a moving hook rotatably coupled to the coupler body by a hinge shaft formed on the coupler body to be fastened to the others of the pin fastened to the fixed hook of the coupling pins of the attachment; a hydraulic cylinder rotating the moving hook by stretching/contracting with an end coupled to the moving hook by a first fixing pin and the other end coupled to the coupler body by a second fixing pin; a locking hook rotatably coupled to the coupler body by the second fixing pin and having an end curved in a hook shape; and a power transmission member having an end supported such that the position is changed by rotation of the moving hook and the other end coupled to the other end of the locking hook by a third fixing pin, in which the fixed hook can be doubly locked when the coupler and an attachment are combined, so there is the advantage of preventing separation of the attachment.
According to this related art, it is possible to doubly lock the fixed hook using the locking hook and the power transmission member that are operated with movement of the moving hook, but it is difficult to couple the pin member, the fixed hook, and the moving hook and the configuration for attachment/detachment and double safety coupling is complicated, so the manufacturing cost increases. Further, it is complicated to couple/decouple the pins and the quick coupler to/from each other, so there is inconvenience that assembly and disassembly can be made only at the exact position.
As another example related with a quick coupler, there is Korean Patent No. 10-1425075, titled "Attachment quick change construction for heavy equipment" (registered on July 24, 2014 ) by the same applicant(s), which includes: a quick change body firmly mounted at an end of the arm of the heavy equipment; a jaw body having a fixed jaw detachably coupled to a side of the quick change body by a coupler and a moving jaw pivot-coupled to the fixed jaw and being rotatable by the operation of a cylinder, in which the coupler has an opening being laterally open at a side of the fixed jaw and having an assembly hook and a fixed hook facing each other up and down, an assembly pin member pin-fixed to a side of the quick change body and pivot-coupled to the assembly hook, and a fixed fin member being elevated by an elevator disposed at a side of the quick change body, and being fitted to the fixed hook when moving down.
However, according to the existing quick coupler structure, in order to couple the quick coupler body and the attachment body, a first connection pin of the quick coupler body is hooked to the assembly hook formed at the upper portion of the fixed jaw and the cylinder connection pin at the lower portion of the quick coupler body is hooked to the fixing hook to couple the fixed jaw to the upper connection portion of the quick coupler body, but the lower portion of the fixed jaw and the lower portion of the quick coupler body are coupled in a surface contact type. Therefore, the quick coupler body and the attachment body may not be firmly connected and shock noise may be generated by contact of the lower connection portion in the process of assembly.
Further, a worker has to manually align the connection block of the moving jaw and the actuating rod of the quick coupler body at the pin-coupling position and then pin-couple them using a coupling pin, but there is a possibility of a safety accident of the worker in the process of connecting a heavy attachment to the quick coupler body by manually lifting the moving jaw of the attachment to the actuating rod at the upper portion of the quick coupler body and then pin-coupling the connection block to the actuating rod. Further, it is difficult to align the coupling positions of the connection block and the moving road, so the work takes long time.
Further, it is required to fix the actuating cylinder for operating the moving jaw before coupling the quick coupler body and an attachment in the existing quick coupler body and it is required to separately keep the fixing pin for fixing the actuating cylinder after coupling the quick coupler body and the attachment.

Documents of Related Art

(Patent Document 1) Korean Patent No. 10-1043036, "Attachment coupler for heavy machinery, ensuring a complete coupling with the attachment" (registered on June 14, 2011 )
(Patent Document 2) Korean Patent No. 10-1425075, titled "Attachment quick change construction for heavy equipment" (registered on July 24, 2014 )

Disclosure

Technical Problem

The present invention has been made in an effort to solve the problems and an objective of the present invention is to provide a quick coupler connection system for a construction machine in which the coupling position of an actuating rod and a connecting block is automatically adjusted so that a quick coupler body and a heavy equipment attachment device are quickly and safely combined, in which the quick coupler body and the attachment device can be more easily combined, a stronger connection force can be achieved, and operation noise can be reduced by combining the quick coupler body and the attachment device in a 3-point supporting type and a pin-hook coupling type.
Another objective of the present invention is to provide a coupler connection system for a construction machine that enables an actuating cylinder to be easily fixed to a quick coupler body by a fixing pin before a quick coupler main body and an attachment are coupled, and enables a fixing pin to be easily kept after the quick coupler main body and the attachment are coupled.

Technical Solution

In order to achieve the objectives of the present invention, a quick coupler connection system for a construction machine includes: a quick coupler main body that includes left and right quick coupler bodies facing each other at left and right sides and connected to each other by a connection plate on rears thereof, an actuating cylinder rotatably disposed inside the left and right quick coupler bodies and having an actuating rod disposed on a top thereof and coupled to a connection block of a moving jaw of an attachment by a coupling pin, and a first connection pin and a second connection pin connecting the left and right quick coupler bodies and a cylinder connection pin rotatably supporting the actuating cylinder; the attachment detachably coupled to the quick coupler main body and having the moving jaw being rotatable with respect to a fixed jaw; and guides disposed on inner surfaces of the connection block and guiding pin assembly positions of the connection block and the actuating rod when the moving jaw is rotated, and a lower portion of the actuating cylinder operating the moving jaw is shaft-coupled to the quick coupler main body; and the system comprises a supporting assembly that supports the actuating cylinder to prevent rotation of the actuating cylinder before the actuating rod of the actuating cylinder is coupled to the connection block of the moving jaw is provided, the supporting assembly has a fixed block fixed on an outer surface of a cylinder tube of the actuating cylinder on a side, a supporting block detachably coupled to the fixed block on a side by a bolt and having a coupling protrusion having a fixing hole, and supporting holes formed through the left and right quick coupler bodies such that a supporting pin disposed through the fixing hole is pin-coupled therein.
The quick coupler connection system may further include: a first assembly hook formed such that the first connection pin of the quick coupler main body is coupled to an upper portion of the fixed jaw; a fixing hook formed such that the cylinder connection pin is coupled inside a lower portion of the fixed jaw; and a second assembly hook formed such that the second connection pin of the quick coupler main body is coupled to the lower portion of the fixed jaw.
The guides may protrude from inner sides of the connection block facing each other, may be rounded to have a radius of curvature corresponding to a curvature of the rounded upper portion of the actuating rod, and may have an angular range of 90~180°.
The quick coupler connection system may further include keeping holes formed through the left and right quick coupler bodies to keep the supporting pin when the actuating rod and the moving jaw are combined.
The coupling pin may have a flat chamfered portion on a side of an outer surface and a stopping step continuing from an end of the chamfered portion on another side of the outer surface of the coupling pin to prevent separation out of the connection holes of the connection block, and a chamfered surface corresponding to the chamfered portion and locked to the stopping step is formed on an inner surface of the connection hole formed at a side of the connection block.
The quick coupler connection system may further include: fitting holes formed at a first end portion and a second end portion of the coupling pin; a fastening block integrally coupled to another side of the connection block, having a through-hole formed through a center for inserting and pulling out the coupling pin, and having a fastening hole in which a fastening bolt that is fitted in the fitting hole is inserted ; and a driven block coupled to the first end of the coupling pin to move with insertion and pulling-out of the coupling pin and having a fastening hole in which a fastening bolt that is fitted in the fitting hole is inserted.

Advantageous Effects

When the moving jaw is rotated clockwise by excavator equipment in the process of pin-coupling the moving jaw of the attachment and the actuating rod of the actuating cylinder with the coupling pin, the guides on the connection block of the moving jaw come in contact with the top of the moving jaw and the assembly position of the coupling pin is naturally determined. Accordingly, the assembly position of the coupling pin is determined not manually, but naturally, so it is possible to prevent a safety accident of a worker and easily pin-couple the coupling pin.
Since the first and second connection pins and the cylinder pin are disposed at a side of the quick coupler main body and the first and second assembly hooks and the fixing hook are disposed at the other portion of the fixed jaw facing the side of the quick coupler main body to correspond to the pins, the fixed jaw and the quick coupler main body are coupled in a 3-point supporting type, so they an be simply and firmly assembled.
The actuating cylinder is supported by the supporting pin to be able to be fixed to the left and right coupler bodies before pin-coupling of the coupling pin, but the supporting pin can be kept in the keeping hole after pin-coupling of the coupling pin, so it is possible to easily manage and keep the supporting pin.
Since the chamfered portion and the stopping step are formed on the outer surface of the coupling pin, it is possible to prevent separation of the coupling pin before coupling the actuating rod and the connection block. Further, since the fastening bolts are inserted in the fitting hole of the coupling pin through the fastening holes of the fastening block and the driven block, the coupling pin can be easily fixed.

Description of Drawings

FIG. 1 is a perspective view of a quick coupler connection system for a construction machine according to the present invention;
FIG. 2 is an exploded perspective view of an attachment and a quick coupler main body of the present invention;
FIG. 3 is a front view of FIG. 1;
FIG. 4a is a front view showing the state of a supporting member before a coupling pin is coupled to a moving jaw in the present invention and FIG. 4b is a front view showing the state a supporting pin of the supporting member is kept in a storage hole after the coupling pin is coupled to the moving jaw in the present invention;
FIG. 5a is a cross-sectional view showing the state in which a coupling pin is fastened to a connection block in the present invention and FIG. 5b is a cross-sectional view taken along line A-A and showing the state before the coupling pin is fastened to the connection block;
FIG. 6 is a perspective view showing an actuating cylinder and a supporting member of the present invention;
FIG. 7 is a plan view showing the actuating cylinder and the supporting member of the present invention; and
FIGS. 8a, 8b, 8c, and 8d are views sequentially showing the process of connecting the quick coupler connection system for a construction machine of the present invention.

<Description of the Reference Numerals in the Drawings>

100:	quick coupler main body
110, 120:	left and right quick coupler body
130:	connection plate	131:	first connection pin
132:	second connection pin
133:	cylinder connection pin
140:	coupling pin	142:	chamfered portion
143:	stopping step	144:	fitting hole
150:	actuating cylinder	152:	cylinder tube
154:	actuating rod	200:	attachment
210:	fixed jaw	220:	moving jaw
225:	connection block	230:	hinge shaft
250:	guide	226:	connection hole
226a:	chamfered surface	270:	fastening
275:	fastening hole	280:	driven block
290:	fastening bolt	300:	supporting assembly
310:	fixing block	320:	supporting block
325:	connection protrusion	325a:	fixing hole
330:	supporting hole	340:	keeping hole
350:	supporting pin

Best Mode

Referring to FIGS. 1 to 7, a quick coupler connection system for a construction machine according to the present invention includes: a quick coupler main body 100 that includes left and right quick coupler bodies 110 and 120 facing each other at the left and right sides and connected to each other by a connection plate 130 on the rears thereof, an actuating cylinder 150 rotatably disposed inside the left and right quick coupler bodies 110 and 120 and having an actuating rod 154 disposed on the top thereof and coupled to a connection block 225 of a moving jaw 220 of an attachment 200 by a coupling pin 140, and a first connection pin 131 and a second connection pin 132 connecting the left and right quick coupler bodies 110 and 120 and a cylinder connection pin 133 rotatably supporting the actuating cylinder 150; the attachment 200 capable to be detachable coupled to the quick coupler main body 100 and having the moving jaw 220 being rotatable with respect to a fixed jaw 210; and guides 250 disposed on the inner surfaces of the connection block 225 and guiding pin assembly positions of the connection block 225 and the actuating rod 154 when the moving jaw 220 is rotated.
Referring to FIG. 1, the quick coupler main body 100 includes the left and right quick coupler bodies 110 and 120 spaced apart left and right from each other and connected to each other by the connection plate 130 on the rears thereof.
The first and second connection pins 131 and 132 are pin-coupled to portions of the left and right quick coupler bodies 110 and 120.
The attachment 200 includes the fixed jaw 210 having first and second assembly hooks 212 and 214 to fit a second side thereof to the first and second connection pins 131 and 132, and the moving jaw 220 rotatably hinged to the fixed jaw 210 to be rotated by the actuating cylinder 150 supported in the quick couple main body 100.
Referring to FIG. 2, the fixed jaw 210 further has a first assembly hook 212 formed such that the first connection pin 131 of the quick coupler main body 100 is coupled to the upper portion of a first side, a fixing hook 213 formed such that the cylinder connection pin 133 is coupled inside the lower portion of the first side of the fixed jaw 210, and a second assembly hook 214 formed such that the second connection pin 132 of the quick coupler main body 100 is coupled to a lower portion of the first side of the fixed jaw 210.
The first assembly hook 212 is formed in a hook shape with the lower portion open downward, the fixing hook 213 is formed in a hook shape with the upper portion open upward, and the second assembly hook 214 has a structure being laterally open.
Referring to FIGS. 2 and 3, the first connection pin 131 is pin-coupled to the first assembly hook 212 of the fixed jaw 210, the second connection pin 132 is hook-coupled to the second assembly hook 214, and the cylinder connection pin 133 is hook-coupled to the fixing hook 213, so the fixed jaw 210 is firmly coupled to the quick coupler main body 100 while being stably supported at three points at the upper and lower portions of the quick coupler main body 100.
The guides 250 protrude from the inner sides of the connection block 225 facing each other and are rounded to have a radius of curvature corresponding to the curvature of the rounded upper portion of the actuating rod 154.
The guides 250 may have an angular range θ of 90~180°, when the angular range of the guides 250 may be less than 90°, the contact area with the actuating rod 154 is small, so it may be unstable, and when the angular range of the guides 250 exceeds 180°, rotation of the moving jaw 220 may be interfered with by the actuating rod 154.
The actuating rod 154 has a curvature at the rounded upper portion and has a coupling hole through which the coupling pin 140 is disposed.
The connection block 225 has connection holes 226 through which the coupling pin 140 is disposed.
Referring to FIG. 3, the coupling pin 140 has a flat chamfered portion on a side of the outer surface and a stopping step 143 continuing from an end of the chamfered portion 142 to prevent separation out of the connection holes 226 of the connection block 225, and a chamfered surface 226a corresponding to the chamfered portion 142 and locked to the stopping step 143 is formed on the inner surface of the connection hole 226 formed at a side of the connection block 225.
Further, as shown in FIGS. 5a and 5b, the present invention further includes: fitting holes 144 formed at a first end portion and a second end portion of the coupling pin 140; a fastening block 270 integrally coupled to another side of the connection block 225, having a through-hole formed through the center for inserting and pulling out the coupling pin 140, and having a fastening hole 275 in which a fastening bolt 290 that is fitted in the fitting hole 144 is inserted ; and a driven block 280 coupled to the first end of the coupling fin 140 to move with insertion and pulling-out of the coupling pin 140 and having a fastening hole 275 in which a fastening bolt 290 that is fitted in the fitting hole 144 is inserted.
Accordingly, before the actuating rod 154 and the connection block 225 are assembled, the coupling pin 140 has been pulled out of the connection hole 226 of the other side of the connection block 225 and is positioned at the one side of the connection block 225 with an end fitted in the connection hole 226 of the one side of the connection block 225 and the edge of the chamfered surface 226a locked to the stopping step 143, whereby separation of the coupling pin 140 and the other side of the connection block 225 is prevented.
Thereafter, when the coupling pin 140 is moved right to assemble the actuating rod 154 and the connection block 225, the end of the coupling fin 140 is inserted and pin-coupled in the through-hole of the fastening block 270 coupled to the other side of the connection block 225 and the driven block 280 coupled to the other end of the coupling pin 140 is moved close to the one side of the connection block 225.
Further, when the fastening bolts 290 is inserted into the fastening holes 275 of the fastening block 270 and the driven block 280, the fastening bolts 290 are fitted in the fitting holes 144 formed at both end portions of the coupling pin, thereby being able to fix the coupling pin 140 such that lateral movement of the coupling pin 140 is prevented.
The present invention further includes a supporting assembly 300 that supports the actuating cylinder 150 to prevent rotation of the actuating cylinder 150 before the actuating rod 154 of the actuating cylinder 150 is coupled to the connection block 225 of the moving jaw 220.
Referring to FIGS. 4a, 4b, and 6, the supporting assembly 300 has a fixed block 310 fixed on the outer surface of a cylinder tube 152 of the actuating cylinder 150 on a side, a supporting block 320 detachably coupled to the fixed block 310 on a side by a bolt and having a coupling protrusion 325 having a fixing hole 325a, and supporting holes 330 formed through the left and right quick coupler bodies 110 and 120 such that a supporting pin 350 disposed through the fixing hole 325a is pin-coupled therein.
The supporting assembly 300 further has keeping holes 340 formed through the left and right quick coupler bodies 110 and 120 to keep the supporting pin 350 when the actuating rod 154 and the moving jaw 220 are combined.
The keeping holes 340 are formed above the supporting holes 330 not to be interfered with by the supporting pin 350 when the actuating cylinder 150 is rotated.
According to the process of connecting the quick coupler main body 100 of the present invention and the attachment 200, the quick coupler main body 100 is diagonally positioned such that the first connection pin 131 is hook-coupled to the first assembly hook 212, as shown in FIG. 8a, the first connection pin 131 is moved into the lower open side of the first assembly hook 212 and hang in the first assembly hook 212, as shown in FIG. 8b, and the second connection pin 132 is moved into the open side of the second assembly hook 214 and fitted in the second assembly hook 214, and in this process, the cylinder connection pin 133 is hook-coupled to the fixing hook 213.
Accordingly, the fixed jaw 210 and a side of the quick coupler main body 100 are hook-coupled in a 3-ponit supporting type.
Further, when the quick coupler main body 100 connected with the fixed jaw 210 is rotated clockwise by a heavy equipment arm such as an excavator, as shown in FIG. 8d, the moving jaw 220 coupled to the fixed jaw 210 through the hinge shaft 230 rotates and opens clockwise about the hinge shaft 230.
When the moving jaw 220 is rotated, the guides 250 on the connection block 225 come in contact with the top of the moving jaw 154, the pin-coupling positions of the connection block 225 and the actuating rod 154 are aligned by the contact between the guides 250 and the top of the actuating rod 154.
Accordingly, a worker does not need to manually adjust the pin-assembly positions of the actuating rod 154 and the moving jaw 220 and the guides 250 come in surface contact with the top of the actuating rod 154, so the pin-coupling positions can be naturally aligned, which increases convenience of work.
Further, as shown in FIG. 5b, when the coupling pin 140 moved to the left of the left connection block 250 and separated out of the connection hole 226 of the other side of the connection block 225 is pin-coupled to the connection holes 226 of the connection block 225 and the coupling hole of the actuating rod 154 by being moved to the left, as described above, the coupling pin 140 inserted in the connection hole 226 of the one side of the connection block 225 is laterally moved right and pin-coupled, as shown in FIG. 5a. Further, when the coupling pin 140 is fixed by inserting the fastening bolts 290 into the fastening holes 275 of the fastening block 270 and the driven block 280 and the fitting holes 144 of the coupling pin 140, the process of connecting the attachment 200 to the quick coupler main body 100 is finished.
Further, before pin-coupling of the coupling pin 140, as shown in FIGS. 4a and 7, the cylinder tube 152 of the actuating cylinder 150 is fixed to the left and right quick coupler bodies 110 and 120 by pin-coupling the supporting pin 350 of the supporting assembly 300 to the fixing hole 325a of the supporting block 320 and the supporting holes 330 formed at the left and right quick coupler bodies 110 and 120, whereby there is the advantage that it is possible to prevent movement and rotation of the actuating cylinder 150 before the actuating cylinder 150 is pin-coupled to the moving jaw 220 by the coupling pin 140.
After the coupling pin 140 is pin-coupled, as shown in FIG. 4b, the supporting pin 350 of the supporting assembly 300 can be separated out of the fixing hole 325a and the supporting holes 330 and fitted into the keeping holes 340 to be stowed, so it is possible to prevent loss of the supporting pin 350.
Accordingly, when the moving jaw 220 is rotated clockwise by excavator equipment in the process of pin-coupling the moving jaw 220 of the attachment 200 and the actuating rod 154 of the actuating cylinder 150 with the coupling pin 140, the guides 250 on the connection block 225 of the moving jaw 220 come in contact with the top of the moving jaw 220 and the assembly position of the coupling pin 140 is naturally determined. Accordingly, the assembly position of the coupling pin 140 is determined not manually, but naturally, so it is possible to prevent a safety accident of a worker and easily pin-couple the coupling pin 140.
Further, since the first and second connection pins 131 and 132 and the cylinder pin 133 are disposed at a side of the quick coupler main body 100 and the first and second assembly hooks 212 and 214 and the fixing hook 213 are disposed at the other portion of the fixed jaw 213 facing the side of the quick coupler main body 100 to correspond to the pins, the fixed jaw 210 and the quick coupler main body 100 are coupled in a 3-point supporting type, so they can be simply and firmly assembled.
Further, the actuating cylinder 150 is supported by the supporting pin 350 to be able to be fixed to the left and right coupler bodies 110 and 120 before pin-coupling of the coupling pin 140, but the supporting pin 350 can be kept in the keeping hole 340 after pin-coupling of the coupling pin 140, so it is possible to easily manage and keep the supporting pin 350.
Further, since the chamfered portion 142 and the stopping step 143 are formed on the outer surface of the coupling pin 140, it is possible to prevent separation of the coupling pin 140 before coupling the actuating rod 154 and the connection block 225. Further, since the fastening bolts 290 are inserted in the fitting hole 144 of the coupling pin through the fastening holes 275 of the fastening block 270 and the driven block 280, the coupling pin can be easily fixed.
Although detailed embodiment(s) were described above in the detailed description of the present invention, the present invention may be modified in various ways without departing from the scope of the claims.

Claims

A system comprising a quick coupler connection system for a construction machine and an attachment (200), the quick coupler connection system comprising:
a quick coupler main body (100) that includes left and right quick coupler bodies (110, 120) facing each other at left and right sides and connected to each other by a connection plate (130) on rears thereof, an actuating cylinder (150) rotatably disposed inside the left and right quick coupler bodies (110, 120) and having an actuating rod (154) disposed on a top thereof and coupled to a connection block (225) of a moving jaw (220) of an attachment (200) by a coupling pin (140), and a first connection pin (131) and a second connection pin (132) connecting the left and right quick coupler bodies (110, 120) and a cylinder connection pin (133) rotatably supporting the actuating cylinder;

the attachment (200) capable to be detachable coupled to the quick coupler main body (100) and having the moving jaw (220) being rotatable with respect to a fixed jaw (210); and

guides (250) disposed on inner surfaces of the connection block (225) and guiding pin assembly positions of the connection block (225) and the actuating rod (154) when the moving jaw (220) is rotated, wherein a lower portion of the actuating cylinder (150) operating the moving jaw (220) is shaft-coupled to the quick coupler main body (100) and the system being characterized by a supporting assembly (300) that supports the actuating cylinder (150) to prevent rotation of the actuating cylinder (150) before the actuating rod (154) of the actuating cylinder (150) is coupled to the connection block (225) of the moving jaw (220) is provided, the supporting assembly (300) has a fixed block (310) fixed on an outer surface of a cylinder tube (152) of the actuating cylinder (150) on a side, a supporting block (320) detachably coupled to the fixed block (310) on a side by a bolt and having a coupling protrusion (325) having a fixing hole (325a), and supporting holes (330) formed through the left and right quick coupler bodies (110, 120) such that a supporting pin (350) disposed through the fixing hole (325a) is pin-coupled therein.
The system of claim 1, wherein the guides (250) protrude from inner sides of the connection block facing each other, are rounded to have a radius of curvature corresponding to a curvature of the rounded upper portion of the actuating rod (154), and have an angular range of 90~180°.
The system of claim 1, further comprising:
a first assembly hook (212) formed such that the first connection pin (131) of the quick coupler main body (100) is coupled to an upper portion of the fixed jaw (210);

a fixing hook (213) formed such that the cylinder connection pin (133) is coupled inside a lower portion of the fixed jaw (210); and

a second assembly hook (214) formed such that the second connection pin (132) of the quick coupler main body (100) is coupled to the lower portion of the fixed jaw (210).
The system of claim 3, wherein the first assembly hook (212) is formed in a hook shape with a lower portion open downward, the fixing hook (213) is formed in a hook shape with an upper portion open upward, and the second assembly hook (214) is formed to be laterally open.
The system of claim 1, further comprising keeping holes (340) formed through the left and right quick coupler bodies (110, 120) to keep the supporting pin (350) when the actuating rod (154) and the moving jaw (220) are combined.
The system of claim 1, wherein the coupling pin (140) has a flat chamfered portion (142) on a side of an outer surface and a stopping step (143) continuing from an end of the chamfered portion (142) on another side of the outer surface of the coupling pin (140) to prevent separation out of the connection holes (226) of the connection block (225), and a chamfered surface (226a) corresponding to the chamfered portion (142) and locked to the stopping step (143) is formed on an inner surface of the connection hole (226) formed at a side of the connection block (225).
The system of claim 1, further comprising: fitting holes (140) formed at a first end portion and a second end portion of the coupling pin (140); a fastening block (270) integrally coupled to another side of the connection block (225), having a through-hole formed through a center for inserting and pulling out the coupling pin (140), and having a fastening hole (275) in which a fastening bolt (290) that is fitted in the fitting hole (140) is inserted; and a driven block (280) coupled to the first end of the coupling fin (140) to move with insertion and pulling-out of the coupling pin (140) and having a fastening hole (275) in which a fastening bolt (290) that is fitted in the fitting hole is inserted.