WO2015064874A1

WO2015064874A1 - Safety lock device for quick coupler

Info

Publication number: WO2015064874A1
Application number: PCT/KR2014/004590
Authority: WO
Inventors: 박진환; 안일선
Original assignee: 강토중공업주식회사
Priority date: 2013-10-30
Filing date: 2014-05-22
Publication date: 2015-05-07
Also published as: KR20150050671A; US20160281319A1; KR101542226B1; CN205676940U

Abstract

The present invention relates to a safety lock device for a quick coupler which prevents the coupled state of a work tool installed on a quick coupler at the front of an excavator from becoming arbitrarily released. A safety lock device for a quick coupler according to the present invention is a quick coupler having: a body; a fixed hook formed on one side of the body and having a coupling pin of a work tool inserted therein; and a movable hook provided on a side facing the fixed hook and pivoting according to the actuation of a cylinder to lock another coupling pin of the work tool. Safety locking means are provided on the inside of the body so that the movable hook and the coupling pin of the work tool located within the movable hook are not arbitrarily separated due to the pivoting of the movable hook, firmly maintain a locked state even when a cylinder is damaged during work or transit while the work tool is coupled to the quick coupler, and prevent the work tool from becoming separated or falling from the quick coupler. Thus, accidents causing human casualties and damage to machinery can be prevented, and safety can be ensured.

Description

Safety lock for quick coupler

The present invention relates to a safety lock device for a quick coupler, and more particularly, even when a cylinder or the like is broken when working in a state equipped with a work tool such as a bucket or a breaker using the quick coupler in an excavator It relates to a safety lock device for a quick coupler to have a further improved safety by preventing the lock state of the randomly released.

In general, an excavator uses a quick coupler to quickly or easily install or detach a work tool such as a bucket, tongs, or a breaker, and such work tool is installed or detached by hydraulic pressure from the driver's seat. After the working mechanism of the device is mounted, devices are disclosed so as not to be separated arbitrarily by damage or malfunction of the cylinder or the like.

Conventionally, the work tool connection device for an excavator equipped with a locking device as described above has been filed by the applicant of the Republic of Korea Patent Publication No. 10-2009-0048151, which is rotated by the operation of the cylinder 11 on the lower side of the body 10. And a movable hook 13 coupled to one side coupling pin 12a of the working tool, and a fixing hook 14 coupled to another coupling pin 12b on the opposite side thereof, wherein the fixed hook 14 is provided. The outer side of the hitch 15 is configured to be locked by the fixing pin 16 so that the engagement state is not released arbitrarily, the locking hook 17 is also configured to be inserted into the movable hook (13).

Therefore, by operating the cylinder 11 in a state in which the coupling pin 12b of the work mechanism is coupled to the fixed hook 14, the movable hook 13 is coupled to the coupling pin 12a by the lower portion of the body 10. When the coupling of the mechanism is completed, the hitch 15 is positioned on the upper side of the coupling pin 12b and fixed by the fixing pin 16, and the locking pin 17 is also fixed to the movable hook 13 to work the tool. Of engagement and locking takes place.

However, such a conventional technique is to combine the locking pin to the movable hook or the hitch while the work tool is coupled to the quick coupler to maintain the lock state, but this requires the operator to work off the excavator or to engage the coupling pin by another operator. By doing so, the work is very troublesome and time consuming, and when the locking pin is not applied, if a problem such as damage to the rod of the cylinder occurs during operation, the hydraulic pressure applied to the movable hook is released and the movable hook is coupled. There is a risk of deviating from the pin or releasing the lock state, and thus disconnecting the work tool coupled to the quick coupler, causing personal injury, or impacting an excavator or other equipment, causing a safety accident.

The present invention has been invented to solve the problems of the prior art as described above, an object of the present invention is to separate the work tool from the movable hook or the fixed hook even when the cylinder is damaged in the state in which the work mechanism is coupled to the quick coupler It is to provide a safety lock device for a quick coupler that can ensure the safety by preventing the fall or the lock state is released by falling.

Safety lock device for a quick coupler according to the present invention, the fixing hook is formed on one side of the body and the coupling pin of the working mechanism is inserted, and provided on the opposite side of the fixing hook is rotated in accordance with the operation of the cylinder A quick coupler having a movable hook for locking another engagement pin of a work tool, wherein the inside of the body is locked so that the engagement pin of the work tool located in the movable hook and the fixed hook is not detached in accordance with the rotation of the movable hook. It characterized in that the safety locking means is provided.

According to the present invention, the lock mechanism is reliably maintained even when the cylinder or the like is broken during operation or transportation while the work mechanism is coupled to the quick coupler, so that the work mechanism is separated from the movable hook or the fixed hook, or the lock state is released. This prevents the fall of the product, and thus has the effect of securing safety, such as preventing a human accident or damage to a machine or an apparatus.

1 is a cross-sectional view showing a conventional safety lock device for a quick coupler.

Figure 2 is an overall perspective view showing a safety lock device for a quick coupler according to the present invention,

3 is a perspective view of a state in which the front body plate of the safety lock device for a quick coupler according to the present invention is removed;

Figure 4 is a perspective view of the state removed the back body plate of the safety lock device for a quick coupler according to the present invention.

5 is a perspective view showing a safety locking means of the safety lock device for a quick coupler according to the present invention.

6 is a schematic cross-sectional view seen from the front to show the operating state of the safety lock device for a quick coupler according to the present invention,

Figure 7 is a schematic cross-sectional view seen from the back to show the operating state of the safety lock device for a quick coupler according to the present invention.

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

In general, the quick coupler is coupled to the boom of the excavator and the lower part is coupled to the work tools such as buckets, tongs, and breakers to carry out excavation, such as excavation, excavation, transport of wood and materials, etc. A fixing hook is inserted into the coupling pin and coupled to the coupling pin, and the other side is provided with a movable hook which is rotated by the operation of the cylinder to release the locking or locking state with the coupling pin. By pushing the movable hook to the outside by the push type (Push type), the method of pulling the movable hook by the cylinder on the contrary is called the pull type (Pull type), in this embodiment the push type in detail The description will be omitted, and the description of the full type is omitted.

Figure 2 is an overall perspective view showing a safety lock device for a quick coupler according to the present invention, Figure 3 is a perspective view in a state of removing the front body plate of the safety lock device for a quick coupler according to the present invention, Figure 4 is This is a perspective view with the back body plate of the safety lock device for quick couplers removed.

In the figure, the body 20 is connected to both ends of the front body plate 21 and the rear body plate 22 which are located opposite to each other by

horizontal reinforcement

23, 24 is fixed by means of welding or the like, The hook 25 is fixed to the one side horizontal reinforcement 23 to facilitate movement when transporting.

In addition, the front body plate 21 and the rear body plate 22 are formed with

coupling holes

21a and 22a fixed to the boom of the excavator, respectively, and the cylinder 26 and the rod ( 26a), the tip of the rod 26a is coupled to a pair of movable hooks 27 so that the rods 26a move forward or backward in accordance with the operation of the cylinder 26 to move the movable hooks 27. It is configured to lock or unlock the engagement pin of the work tool by operating forward or backward.

The movable hook 27 is rotatably coupled to the fixing pin 28 across the front body plate 21 and the rear body plate 22.

The opposite side of the movable hook 27 is coupled to a pair of fixing hooks 29 to maintain the locked state by inserting the other coupling pin of the working mechanism.

The fixing hook 29 has one end coupled to the

fixing pins

29a and 29b coupled across the front body plate 21 and the rear body plate 22, and the cylinder 26 is connected to the fixing pin 29a. One end of) is hinged.

On the other hand, a safety lock on the inside of the body 20 to prevent the lock state from being released even when a load applied from the outside or damage to a cylinder or the like is maintained while the coupling pins (a) and (b) of the work tool are kept in a locked state. Means 40 are provided.

The safety locking means 40 is coupled to the fixed pin 28 as shown in Figure 5 is coupled to the movable side hitch 41 and the fixed pin 29b to rotate on the opposite side of the movable hook 27 The fixed side hitch 42 which rotates on the upper side of the fixed hook 29 is included.

The fixed side hitch 42 is configured to rotate downward by the elastic force of the spring 43 coupled to the fixed pin 29b, one end of the spring 43 is supported above the fixed side hitch 42 The other end is supported by the body 2.

And the operation bar 44 is coupled to one side of the fixed side hitch 42, the operation bar 44 is configured to linearly move in the guide block 45 fixed to the inside of the front body plate 21 And, the front end of the operation bar 44 is coupled to the operation roller 46 for contacting and moving the contact portion (27a) formed on the outer side of the movable movable hook (27).

In addition, the other side of the fixed side hitch 42 and the tip of the movable side hitch 41 is coupled to the operation link 50 that rotates in accordance with the movement of the operation bar (44).

The actuating link 50 has a first link 51 having a front end coupled to a front end of the movable side hitch 41, and a second link 52 having a front end hinged to one side of the fixed side hitch 42. ), And both screw nuts 53 screwed to opposite ends of the first link 51 and the second link 52.

On the inner side of the two-nut nut 53, the left side thread is formed on the opposite side, the first link 51 and the second link 52 is the right side thread and the left side thread is processed to be combined. , The overall length of the operation link 50 can be adjusted according to the coupling degree of the screw.

Safety lock device for a quick coupler according to the present invention configured as described above is the driver in the midstream of the work in the state in which the engaging pin provided at the tip of the boom of the excavator is coupled to the engaging holes (21a) (22a) formed in the body 20 Accordingly, work is performed by combining work tools such as buckets, breakers, and tongs.

First, when the movable hook 27 rotates counterclockwise in FIG. 6 while the rod 26a is reversed, the contact portion 27a pushes the leading end of the operating bar 44, that is, the operation roller 46, into a one-dot chain line. As shown, the fixed side hitch 42 is opened, and as the fixed side hitch 42 is opened, the operation link 50 connected thereto is operated to open the movable side hitch 41.

In this state, the fixed side hitch 42 is opened upward, and the movable hook 27 and the movable side hitch 41 on the opposite side are also opened.

At this time, by lowering the boom of the excavator, the coupling pin (b) is inserted into the fixing hook 29 on one side of the quick coupler, the opposite coupling pin (a) is positioned below the body 20, and the cylinder 26 is advanced. When activated, the rod 26a moves forward to rotate the movable hook 27 clockwise to lock.

When the movable hook 27 is advanced, the contact portion 27a is spaced apart from the operation roller 46 and the operating bar 44 is free. Accordingly, the fixed side hitch 42 is caused by the elastic force of the spring 43. In FIG. 6, it is lowered in a clockwise direction to cover the upper side of the coupling pin b so as to be locked, and at the same time, the operation link 50 coupled to the fixed side hitch 42 moves to the right in FIG. The movable hitch 41 is rotated clockwise around the fixing pin 28 to surround the coupling pin a to be locked.

Therefore, the engaging pin (a) of the working mechanism is locked in a posture wrapped on both sides by the movable hook 27 and the movable side hitch 41, and the coupling pin (b) on the opposite side is fixed hook 29 and fixed Since the lock is made in a posture wrapped on both sides by the side hitch 42, the lock state is not released arbitrarily even by an impact applied from the outside or damage to the cylinder, thereby further improving safety.

When the rod 26a is retracted by the operation of the cylinder 26 when the lock state is released, the contact portion 27a contacts the operation roller 46 while the movable hook 27 rotates in the counterclockwise direction. 44, the fixed side hitch 42 is rotated upwards to release the locking state of the coupling pin (b), and at the same time the fixed side hitch 42 is raised while the operation link (50) coupled thereto The pull pin is pulled and thus the movable side hitch 41 is rotated and opened, thereby releasing the locking state of the coupling pin a.

In the present exemplary embodiment, the push type quick coupler is illustrated and described, but the present invention is not limited thereto, and the push type quick coupler may be applied to the pull type quick coupler.

Claims

A body, a fixed hook formed at one side of the body and into which a coupling pin of the working tool is inserted, and a movable hook provided on an opposite side of the fixed hook to rotate according to the operation of the cylinder to lock another coupling pin of the working tool. In the quick coupler to have,

Safety lock means for the quick coupler on the inside of the body is provided with a safety locking means for locking so that the engaging pin of the work mechanism located in the movable hook and the fixed hook is not separated according to the rotation of the movable hook.
The method of claim 1,

The safety locking means may be rotatably coupled to an upper side of the movable hook to receive an elastic force by a spring, a fixed side hitch rotatably coupled to an upper side of the fixed hook, and a tip of the fixed side hitch. And a working bar coupled to the movable bar and moved according to the rotation of the movable hook, and an actuating link coupled to the movable side hitch and the fixed side hitch.
The method of claim 2,

The operation bar is a safety lock device for a quick coupler, characterized in that the contact portion of the movable hook to rotate in accordance with the operation of the cylinder by pushing the tip of the guide block fixed to the body to rotate the fixed side hitch.
The method of claim 2,

Safety lock device for a quick coupler characterized in that the front end of the operation bar is provided with an operation roller in contact with the contact portion of the movable hook.
The method of claim 2,

The actuating link includes a first and a second link having one end coupled to a movable hitch and a fixed side hitch, and both threaded nuts coupled to respective ends of the first and second links. Safety lock.