KR102522198B1 - Excavator attachment type thumb device - Google Patents

Abstract

The present invention relates to an excavator-attached tongs device. The tongs are spaced apart from side to side, and a pair of tong coupling pieces are rotatably coupled to the front end of the arm shaft around a horizontal axis in a state in which the tip of the excavator arm shaft is inserted, and a pair of tong coupling pieces at the rear end in a recessed shape toward the front edge of the arm shaft, It is provided with a tongs body bent in two steps so that the left and right side spacing becomes narrower toward the front end, and a tongs fork formed at the front end of the tongs body. Cylinder for tongs includes a cylinder body fixed to the arm of an excavator, and a cylinder rod that rotates the tongs to unfold or fold with respect to the arm as it extends and contracts with respect to the cylinder body in a state in which the front end is hinged to the tongs body.

Description

Excavator attachment type thumb device}

The present invention relates to a tongs device that is attached to an excavator and picks up and transports a work object at a civil engineering or construction site together with a bucket.

In general, heavy equipment such as excavators used in civil engineering and construction sites is located at the tip of an arm frame according to its purpose, such as digging using a bucket, concrete and rock crushing using a breaker, etc. It is designed to perform work while replacing various types of attachments to the quick coupler.

Such an excavator may be provided with a tongs device for picking up and transporting a work object such as wood. The clamp device may be divided into a type mounted on a quick coupler and a type attached to an excavator arm.

The excavator-attached tongs perform gripping work together with the bucket mounted on the quick coupler. The tongs device is configured so that the tongs are rotatably installed on the armrest from the inside of the bucket, and a cylinder for tongs is mounted between the tongs and the armrest to rotate the tongs to engage or open the bucket to pick up or place the work object.

On the other hand, in the existing tongs structure, when the tongs cylinder is extended to the maximum and the tongs pick up the workpiece, twist always occurs due to the irregular shape of the workpiece such as a stone.

Although expensive iron plates with good resilience are used in the very vulnerable tongs due to the concentration of torsion fatigue, the accumulated fatigue is concentrated on the bent part of the tongs body, and after the tongs are twisted, sequentially the tongs cylinder and the assembled pins accumulate in In this way, the twist affects the tongs body and the tongs cylinder to accumulate damage, causing problems with the durability of a specific part of the tongs and the tongs cylinder seal.

An object of the present invention is to provide an excavator-attached tongs device capable of increasing durability by being robust against torsion during operation.

Excavator-attachable tongs device according to the present invention for achieving the above object includes a tongs, and a cylinder for tongs. The tongs are spaced apart from side to side, and a pair of tong coupling pieces are rotatably coupled to the front end of the arm shaft around a horizontal axis in a state in which the tip of the excavator arm shaft is inserted, and a pair of tong coupling pieces at the rear end in a recessed shape toward the front edge of the arm shaft, It is provided with a tongs body bent in two steps so that the left and right side spacing becomes narrower toward the front end, and a tongs fork formed at the front end of the tongs body. The cylinder for tongs is a cylinder body hinged to the arm of an excavator, and the front end is connected to the tong body by a pair of first tong links and a second tong link, and as the cylinder body expands and contracts, the tongs to the arm It has a cylinder rod that rotates to expand or collapse.

The pair of first tong links are respectively disposed on the left and right sides of the arm rod tip, and the rear end is hinged to the arm rod tip and the front end is hinged to the cylinder rod. The rear end of the second tong link is hinged with the front ends of the first tong links and the front end is hinged to the tong body. Here, the first tong links may be bent in one stage so that the distance between them becomes narrower toward the front end.

As an additional aspect, the excavator-attachable tongs device may include a safety mechanism that locks or releases the second tongs link to the cylinder body in a state in which the tongs are completely folded by maximum contraction of the cylinder rod.

Here, the safety mechanism is a locking hole formed at the front end of the second clamp link, a base block mounted on the cylinder body, and a central portion of the base block. As it rotates in a state of being coupled with a hinge pin, the locking protrusion is inserted into the locking hole to control 2 A magnetic lever that locks the tongs link or separates from the lock hole to release the second tongs link, and a permanent magnet for lock retention mounted on the base block to fix the magnetic lever with magnetic force in the locked position of the magnetic lever and keep it in a locked state. , And it may be provided with a permanent magnet for holding release mounted on the base block to fix the magnetic lever at the release position of the magnetic lever with magnetic force and maintain it in the release state.

As an additional aspect, the excavator-attachable tongs device may include a buffer member mounted on the tongs or the arms to absorb an impact applied to the tongs when the cylinder rod is maximally contracted and the tongs are completely folded.

According to the present invention, compared to the existing tongs in which the degree of fatigue is concentrated in a specific bent part by bending once from the arm tip to the fork, the tongs are bent twice to disperse fatigue caused by twisting during work. Consisting of, it is possible to increase durability by reducing fatigue in the cylinder for tongs and the assembled pin.

The left and right sides of the body of the tongs from the arm tip to the fork can be formed in a straight line without bending, but this structure narrows the driver's field of view and can cause accidents during work, so existing tongs bend from the arm tip to the fork at once. However, according to the present invention, a pair of first tong links and a second tong link have a structure in which the tongs minimize distortion while maximally securing the driver's field of vision. By being connected to the cylinder rod of the cylinder for tongs, damage applied to the cylinder for tongs due to twisting of the tongs can be reduced and the probability of damage to the cylinder rod can be reduced.

According to the present invention, it is possible to secure safety by preventing the tongs from moving unintentionally due to a problem in the tongs cylinder by the safety mechanism. In addition, according to the present invention, when the tongs are folded to the arms in a completely folded state, they are buffered by the buffer member and noise generation can be eliminated.

1 is a perspective view of an excavator-mounted tongs device according to an embodiment of the present invention.
Figure 2 is a front view of Figure 1;
3 is a perspective view showing a state in which the tongs are unfolded from the arm band in FIG. 1;
Figure 4 is a front view of Figure 3;
5 is a perspective view of the safety mechanism.
FIG. 6 is an exploded perspective view of FIG. 5 .
FIG. 7 is a perspective view illustrating a state in which the safety mechanism locks in FIG. 5 .
8 is a view showing an example in which an adjustment bolt is provided in a safety mechanism.
9 is a perspective view of a buffer member.

The present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted.

Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clarity.

Hereinafter, terms in the 'line', 'rear', 'left', 'right', 'up', and 'down' directions are defined based on the excavator arm for convenience of description.

1 is a perspective view of an excavator-mounted tongs device according to an embodiment of the present invention. Figure 2 is a front view of Figure 1; 3 is a perspective view showing a state in which the tongs are unfolded from the arm band in FIG. 1; Figure 4 is a front view of Figure 3;

1 to 4, an excavator-attachable tongs device according to an embodiment of the present invention includes tongs 100 and a tongs cylinder 200. Here, the excavator-attached tongs device is attached to the excavator arm 10 and operates to pick up or place a work object together with a bucket mounted on the quick coupler 20.

The tongs 100 include a pair of tongs coupling pieces 110, a tongs body 120, and a tongs fork 130. The pair of tong coupling pieces 110 are spaced apart from side to side and rotatably coupled to the front end of the arm stage 10 about a horizontal axis in a state where the front end of the arm stage 10 of the excavator is inserted. Each clamp coupling piece 110 may have a coupling hole inserted into a hinge pin together with the assembly hole 11 at the front end of the arm stand 10 . Tweezers coupling piece 110 may be structurally robust as the outer periphery of the coupling hole protrudes in a ring shape.

The clamp body 120 is connected to the clamp coupling pieces 110 at the rear end in a recessed form at the front end of the arm stand 10, and is bent in two stages so that the left and right side gaps become narrower toward the front end. The tongs body 120 may be formed in a shape bent towards the bucket toward the front end. The tongs body 120 may have a bottom portion 121 and left and right side portions 122 and 123 extending from left and right sides of the bottom portion 121 at intervals.

The bottom part 121 and the left and right side parts 122 and 123 pick up the workpiece together with the bucket. The bottom portion 121 may have an interference avoidance hole 121a to avoid interference with the tongs cylinder 200 in a state in which the tongs 100 are completely folded on the armrest 10. The bottom part 121 may have teeth 121b protruding toward the bucket at the left and right edges. Teeth (121b) may be arranged at intervals along the front-rear direction of the bottom portion (121).

The left and right side portions 122 and 123 are connected to the tong coupling pieces 110, respectively. That is, the tongs body 120 is made of the same material as the tongs coupling pieces 110 and is integrally manufactured. The left and right side parts 122 and 123 are bent in two steps so that the distance between them becomes narrower toward the front end. The left and right side parts 122 and 123 are bent in one step so that the distance between the central parts is narrower than that between the rear parts, and the distance between the front parts is bent in two steps so that the distance between the central parts is narrowed.

The left and right side parts 122 and 123 are bent in one step so that each central part forms an inclined step 122a, 123a with each rear part, and each front part forms an inclined step 122b, 123b with each central part. It can be bent in two stages. Thus, the tongs body 120 can be robust against torsion.

When the tongs 100 pick up the workpiece, twist may occur in the tongs body 120 due to the irregular shape of the workpiece, such as a stone. can be dispersed by two-step bending, reducing fatigue in the cylinder 200 for tongs and the assembled pin.

The tongs fork 130 is formed at the tip of the tongs body 120. The tong fork 130 may be formed in a form having a pair of left and right fork parts spaced apart. The tongs fork 130 may be manufactured separately from the tongs body 120 and mounted on the tongs body 120 . When the tong fork 130 is damaged or broken, it can be replaced or repaired separately.

Cylinder 200 for tongs includes a cylinder body 210 and a cylinder rod 220. The cylinder body 210 is hinged to the arm frame 10 of the excavator. The cylinder rod 220 is connected to the clamp body 120 by a pair of first clamp links and a second clamp link, and as the cylinder rod 220 expands and contracts with respect to the cylinder body 120, the clamp 100 is moved to the arm ( 10) is rotated to unfold or fold. Cylinder 200 for tongs may be made of a double-acting hydraulic cylinder or the like.

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The pair of first clamp links 300 are respectively disposed on the left and right sides of the front end of the arm bar 10, and the rear end is hinged to the front end of the arm bar 10 and the front end is hinged to the cylinder rod 220. The first clamp link 300 may have a coupling hole inserted into the hinge pin together with the assembly hole 12 at the front end of the arm stand 10 at the rear end.

Here, the assembly hole 12 at the front end of the arm stand 10 may be provided to be inserted into the hinge pin together with the coupling hole of the link 30 for the bucket. Therefore, even if a separate assembly hole for the first clamp link 300 is not provided at the front end of the arm bar 10, the first clamp link 300 can be easily assembled at the front end of the arm bar 10.

The first clamp link 300 may have an assembly hole of the cylinder rod 220 at the front end and a coupling hole inserted into a hinge pin. The cylinder rod 220 has a connection block 221 at its front end, and an assembly hole for hinge coupling with the first clamp link 300 may be formed in the connection block 221. The first tong link 300 may be structurally robust because the periphery of the coupling hole at the tip protrudes in a ring shape. The first clamp link 300 may be formed in an approximate I-shape.

The rear end of the second clamp link 400 is hinged with the front ends of the first clamp links 300 and the front end is hinged to the clamp body 120. The rear end of the second clamp link 400 is hinged to the cylinder rod 220 together with the front ends of the first clamp links 300 .

The second clamp link 400 may be formed in a form in which the left and right link plates 420 and 430 are connected to the central link plate 410 . The second clamp link 400 may be formed in an approximately H shape. The second clamp link 400 may have a coupling hole inserted into a hinge pin together with the coupling holes of the first clamp links 300 at the rear ends of the left and right link plates 420 and 430 . The second clamp link 400 may have a coupling hole inserted into the hinge pin together with the assembly hole of the clamp body 120 at the front ends of the left and right link plates 420 and 430 .

Here, the clamp body 120 has connection blocks 124 inside the rear of the left and right side parts 122 and 123, and assembly holes may be formed in the connection blocks 124, respectively. The clamp body 120 may be hinged with the front end of the second clamp link 400 sandwiched between the connecting blocks 124 . The second clamp link 400 may protrude in a ring shape around the coupling holes to be structurally robust.

In this way, since the tongs 100 are connected to the cylinder rod 220 of the tongs cylinder 200 by a pair of first tong links 300 and the second tong links 400, the tongs 100 Even if twisted, the first tong links 300 and the second tong links 400 can withstand and reduce damage applied to the tong cylinder 200 .

As a comparative example, when the tongs 100 are connected to the cylinder rod 220 of the tongs cylinder 200 without the first tongs links 300 and the second tongs links 400, the tongs device alone after removing the bucket Since the exposed portion of the cylinder rod 220 protrudes more than the tip of the arm stand 10 during operation, the probability of damage to the cylinder rod 220 may be very high.

However, as in the present embodiment, when the tongs 100 are connected to the cylinder rod 220 of the tongs cylinder 200 by the first tong links 300 and the second tong links 400, after removing the bucket When the clamp device is operated alone, the exposed area of the cylinder rod 220 is very small compared to the comparative example, so the probability of damage to the cylinder rod 220 can be reduced. The second tong link 400 may also serve to protect the front end of the cylinder rod 220 .

In addition, as a comparative example, when the first tong links 300 and the second tong links 400 are not present, the position of the cylinder body 210 is close to the front end of the arm bar 10, so that the soil contained in the bucket during excavation work The probability of contact with the cylinder body 210 of a stone or the like is high, and the risk of damage to the cylinder body 210 is high.

However, as in the present embodiment, when the first tong links 300 and the second tong links 400 are provided, the position of the cylinder body 210 is farther from the front end of the arm bar 10 than in the comparative example, so that the bucket during excavation work The contact probability of soil and stones contained in the cylinder body 210 is lowered, and the risk of damage to the cylinder body 210 can be reduced.

The first tong links 300 may be bent in one step so that the distance between them becomes narrower toward the front end. When the width of the tongs 100 is widened, the field of view of the driver sitting in the driver's seat of the excavator is blocked. When the first tong links 300 are flat, the width of the tongs 100 must be widened, but the driver's field of view is narrowed, which can be dangerous in operating the excavator.

When the first tong links 300 are bent in the above-described form and stepped, interference with the tongs 100 is avoided and the width of the centrally bent part of the tongs 100 is minimized, thereby sufficiently securing the driver's field of vision. The first tong link 300 may be bent so that the front portion forms an inclined step 310 with the rear portion. The first tong link 300 may have a robust structure by protruding the reinforcing block 320 on the outer surface of the inclined step 310 .

As an additional aspect, as shown in FIGS. 5 to 7, the excavator-attachable tongs device attaches the second tongs link 400 to the cylinder body in a state in which the tongs 100 are completely folded by maximally contracting the cylinder rod 220. 210 may include a safety mechanism 500 that locks or unlocks.

The safety mechanism 500 prevents the cylinder rod 220 from flowing down due to a problem with the tongs cylinder 200 or unintentional movement of the tongs due to a user's malfunction, thereby ensuring safety.

For example, the safety mechanism 500 includes a locking hole 510, a base block 520, a magnetic lever 530, a permanent magnet 540 for locking, and a permanent magnet 550 for holding release. can do.

The locking hole 510 is formed at the rear end of the second clamp link 400 . The second clamp link 400 has locking pieces extending rearward from the periphery of the rear end coupling holes of the left and right link plates 420 and 430, and a locking hole 510 may be formed in at least one of the locking pieces.

The base block 520 is mounted on the cylinder body 210. The base block 520 is a magnetic lever (520a) by a hinge pin (520a) in a state where the magnetic lever 530 is inserted into the coupling hole between a pair of support pieces 522 spaced apart from each other on the block body 521. 530) and hinged. Support pieces 522 have coupling holes coupled with hinge pins.

As the magnetic lever 530 rotates in a state in which the central portion is coupled to the hinge pin 520a in the coupling hole of the base block 520, the locking protrusion 531 is fitted into the locking hole 510, so that the second clamp link 400 ) is locked or separated from the locking hole 510 to release the second clamp link 400.

The magnetic lever 530 has a coupling hole formed in the central portion and is inserted into the hinge pin 520a together with the coupling holes of the support pieces 522, so that the magnetic lever 530 moves in a seesaw manner around the hinge pin 520a. The magnetic lever 530 is made of a magnetic material such as iron that can be attached to a permanent magnet. The magnetic lever 530 may be made of a magnetic material only in part corresponding to the permanent magnet 540 for holding the lock and the permanent magnet 550 for holding the release.

The magnetic lever 530 maintains the locked position by attaching to the permanent magnet 540 for locking in the locked position, and maintains the unlocking position by attaching to the permanent magnet 550 for unlocking in the rotated state to the unlocking position. do. A locking protrusion 531 is formed at an end close to the locking hole 510 of the magnetic lever 530 . The magnetic lever 530 may have a handle 532 formed at an end far from the locking hole 510 .

The permanent magnet 540 for locking is mounted on the base block 520 to fix the magnetic lever 530 with magnetic force at the locked position of the magnetic lever 530 and maintain it in a locked state. The permanent magnet 550 for holding release is mounted on the base block 520 to fix the magnetic lever 530 with magnetic force at the release position of the magnetic lever 530 and maintain it in the released state.

The permanent magnet 540 for holding the lock and the permanent magnet 550 for holding the release are spaced apart from each other around the hinge coupling part of the magnetic lever 530. The permanent magnet 540 for locking is disposed close to the locking protrusion 531 of the magnetic lever 530 and is mounted on the base block 520 . The permanent magnet 550 for holding the release is disposed away from the lock protrusion 531 of the magnetic lever 530 and is mounted on the base block 520 . This safety mechanism 500 can operate to lock or release the tongs 100 to the tongs cylinder 200 as needed by the operator.

As an additional aspect, as shown in FIG. 8 , the coupling hole 523 of the base block 520 has a long hole shape elongated along the longitudinal direction of the magnetic lever 530, and a hinge pin 520a may be inserted therein. The safety mechanism 500 is screwed into the base block 520 to be drawn in and out of the long hole-shaped coupling hole 523 to adjust the position of the hinge pin 520a so that the locking protrusion 531 and the locking hole 510 An adjusting bolt 560 for adjusting the gap G may be included.

Coupling holes 523 in the form of long holes may be formed in each of the support pieces 522 , and accordingly, adjustment bolts 560 may also be screwed into each of the support pieces 522 . The adjustment bolt 560 is screwed to the lower end of the support piece 522 to raise or lower the hinge pin 520a according to the degree of fastening, thereby increasing the fitting gap G between the locking protrusion 531 and the locking hole 510. can be adjusted The adjusting bolt 560 may be made of a nutless bolt or the like.

As another example, the safety mechanism may be formed in locking holes in the second clamp link 400 and the cylinder body 210 and locked or unlocked with a lock pin.

As an additional aspect, as shown in FIG. 9, the excavator-attached tongs device is a tongs so that the cylinder rod 220 is maximally contracted to buffer the impact applied to the tongs 100 in a completely folded state of the tongs 100 ( 100) or a buffer member 600 mounted on the arm stand 10.

When the tongs 100 are completely folded while the tongs 100 are being used, the cylinder rod 220 is maximally contracted, and the tongs 100 and the arm band 10 directly collide with each other without the buffer member 600 , noise may occur. In particular, in the case of the tongs 100 having a gap, the noise may be greater. When the tongs 100 are completely folded, the buffer member 600 collides with the tongs 100 or the arm band 10 to play a buffer role and eliminate noise generation.

For example, the buffer member 600 may be mounted on the second clamp link 400 . The buffer member 600 may be disposed adjacent to the rear end of the central link plate 410 of the second clamp link 400 . The buffer member 600 may be formed in various shapes such as a cylindrical shape. The buffer member 600 may be made of a material having a buffer and anti-vibration function, such as rubber or urethane. As another example, the buffer member 500 may be mounted on the armrest 10 to correspond to the rear end of the central link plate 410 of the second clamp link 400 .

The present invention has been described with reference to an embodiment shown in the accompanying drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. You will be able to. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

100. Tongs 110.. Tongs combined
120.. Tongs body 130.. Tongs fork
200..cylinder for tongs 210..cylinder body
220.. cylinder rod 300.. first clamp link
400..Second clamp link 500..Safety mechanism
510.. Lock hole 520.. Base block
530..Magnetic lever 540..Permanent magnet for locking
550.. Permanent magnet for holding release 560.. Bolt for adjustment
600..absence of buffer

Claims (6)

A pair of clamp coupling pieces spaced apart from side to side and rotatably coupled to the front end of the arm shaft around a horizontal axis in a state where the tip of the arm shaft of the excavator is inserted, and the clamp coupling pieces at the rear end in a form in which a portion facing the front end of the arm shaft is depressed Tongs having a tongs body connected to and bent in two stages so that the left and right lateral intervals become narrower toward the front end, and a tongs fork formed at the front end of the tongs body;
As the cylinder body hinged to the arm of the excavator and the front end are connected to the tong body by a pair of first tong links and a second tong link, the tong moves with respect to the cylinder body. A cylinder for tongs having a cylinder rod that rotates to expand or fold with respect to; and
A safety mechanism for locking or releasing the second tong link from the cylinder body when the cylinder rod is maximally contracted and the tong is completely folded,
The pair of first clamp links are respectively disposed on left and right sides of the arm rod tip, the rear end of which is hinged to the arm rod tip and the front end is hinged to the cylinder rod;
The second clamp link has a rear end hinged with the front ends of the first clamp links and a front end hinged to the clamp body;
The safety mechanism,
A locking hole formed at the rear end of the second clamp link;
A base block mounted on the cylinder body;
As the central part rotates while being coupled to the coupling hole of the base block by the hinge pin, the locking protrusion is inserted into the lock hole to lock the second clamp link or separated from the lock hole to release the second clamp link A magnetic lever,
A permanent magnet for holding the lock mounted on the base block to fix the magnetic lever with magnetic force at the locked position of the magnetic lever and keep it in a locked state, and
An excavator-attached tongs device, characterized in that it comprises a permanent magnet for holding the release mounted on the base block to fix the magnetic lever with magnetic force at the release position of the magnetic lever and maintain it in a released state. delete According to claim 1,
The first tong links are excavator-attached tongs devices, characterized in that one-step bending so that the distance between them becomes narrower toward the front end. delete According to claim 1,
The coupling hole of the base block has a long hole extending along the longitudinal direction of the magnetic lever and inserts the hinge pin;
The safety mechanism,
An excavator-attached tongs device comprising an adjustment bolt that is screwed into the base block to be drawn in and out of the long hole-shaped coupling hole to adjust the distance between the locking protrusion and the locking hole by adjusting the position of the hinge pin. According to claim 1,
Excavator-attachable tongs device comprising a buffer member mounted on the tongs or arm to absorb the impact applied to the tongs when the cylinder rod is maximally contracted and the tongs are completely folded.

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