JP2001026941A - End attachment mounting device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end attachment mounting device for construction machine capable of facilitating exchange work of end attachments and constituting a lock means of a screw rod inexpensively. SOLUTION: In a screw rod 10 expanding and shrinking a distance between hooks to lock an end attachment, annular grooves 35, 36 are formed at outer periphery in the vicinity of an end part of a regular hexagonal column part 17 of the screw rod 10. The annular grooves 35, 36 are formed by separating them from each other by an interval equivalent to a width of a lock block 11 regulating the rotation of the screw rod 10. A general-purpose retaining ring 37 is fitted in the annular groove 35 on one side, next the lock block 11 is fitted in the regular hexagonal column part 17 of the screw rod, and furthermore a general-purpose retaining ring 38 is fitted in the other annular groove 36 in the same way. Consequently, the lock block 11 is fixed to prevent coming off of the lock block 11 due to vibration of a machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end attachment mounting device for a construction machine, and more particularly, to an end attachment mounting device for a construction machine.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end attachment mounting device for a construction machine for mounting and exchanging an end attachment such as a bucket, a gripper, a vibration crusher mounted on a hydraulic shovel or the like.

[0002]

2. Description of the Related Art Conventionally, construction machines such as hydraulic excavators of this type include general construction machines used for a plurality of work purposes in addition to dedicated machines for performing only one work. For example, when performing a different work such as lifting a rock or breaking a concrete wall in addition to digging work with one construction machine, attach a bucket, a gripper, a crusher, etc. according to each work. ,
Alternatively, it is necessary to leave. For this reason, end attachment mounting devices have conventionally been developed in order to enable the end attachment to be replaced at a construction site.

[0003] The applicant of the present invention has previously filed an application for an end attachment mounting device for this type of construction machine (Japanese Patent Application No. 10-143239). Therefore, the end attachment mounting device according to the prior application will be described with reference to FIGS. In the drawing, reference numeral 1 denotes an end attachment mounting device. The end attachment mounting device 1 includes brackets 4 connected to a front end of a boom 2 of a construction machine and a front link 3; 4 and fixed support plates 6 and 6 having hooks 5
And a pin 7 fixedly mounted on the brackets 4, 4 so as to be rotatable on the brackets 4, 4, and a hook 8.
, A screw rod 10 for expanding and contracting the distance between the hooks 5 and 8, and a lock block 11 for preventing the screw rod 10 from rotating loosely.

A block 12 is rotatably supported on the fixed support plates 6, 6, and a lock plate 14 having a U-shaped groove 13 is fixed to the right side of the block 12 on the block 12. ing. A block 15 is rotatably supported by the rotation support plates 9 and 9.

A screw hole 15 of the block 15 is provided at one end of the screw rod 10 for connecting the block 12 and the block 15 to expand and contract the distance between the hooks 5 and 8.
A screw 16 to be screwed with a is formed, and a regular hexagonal column 17 is provided at the opposite end. The screw rod 10 is rotatably attached to the blocks 12 and 15, and its axial movement is restricted by a large-diameter round shaft portion 18 and a mounting plate 19.

On the other hand, in the lock block 11 for preventing the screw rod 10 from loosening and rotating, the regular hexagonal inner hole 20 of the lock block 11 is fitted to the outer surface of the regular hexagonal column 17 of the screw rod 10. The lock block 11 has a rectangular outer surface 21 which is fitted into the U-shaped groove 13 of the lock plate 14 so as not to rotate.

As shown in FIG. 7, a groove 22 is formed in an annular shape on the outer periphery of the regular hexagonal column portion 17, and an annular groove 23 is formed in an inner periphery of the lock block 11. A snap ring 24 as shown in FIG. The snap ring 24 is made of a springy material, and is formed in an annular shape with a part of the snap ring notched.

[0008]

The end attachment mounting apparatus according to the prior application of the applicant of the present invention is configured as described above, and the mounting of the end attachment 25 is performed by the following procedure. As shown in FIG. 5, the mounting pins 26 of the end attachment 25 are engaged with the hooks 5 of the fixed support plates 6, 6, and then the regular hexagonal column 1 of the screw rod 10 is engaged.
7, a box wrench or the like is attached to the hook 7, and the screw rod 10 is turned to increase the distance between the hooks 5 and 8, and the mounting pins 27 of the end attachment 25 are engaged with the hooks 8 of the rotation support plates 9 and 9. And fixing the mounting pins 26 and 27, and attaching the end attachment 25 to the brackets 4 and 4.
Attach to Then, the lock block 11 is pressed from the outside of the regular hexagonal column portion 17 and the snap ring
The snap ring 24 is inserted into the groove 2 as it is.
Insert until it fits in 2. Thus, the lock block 11 prevents the screw rod 10 from rotating loosely, and the snap ring 24 prevents the lock block 11 from falling off. In addition, the end attachment 2
To remove 5, the above procedure is reversed.

As described above, according to the end attachment mounting device, the operation of attaching and detaching the lock block can be performed with a single touch, and the effect of easily replacing the end attachment can be obtained. However, according to the above-mentioned application, the snap ring used as a means for preventing the rotation of the screw rod is not an off-the-shelf product, which causes a cost increase.

Therefore, there arises a technical problem to be solved in order to facilitate the work of exchanging the end attachment and to obtain an end attachment mounting device for a construction machine in which the means for preventing the screw rod from rotating is formed at lower cost. Thus, the present invention aims to solve this problem.

[0011]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and comprises a bracket connected to a front end of a boom of a construction machine and a front link, and a bracket fixed to the bracket. A fixed support plate having a hook, a screw rotatably provided on the bracket by a pin fixed to the bracket, and a rotary support plate having a hook, and a screw for expanding and contracting the distance between the hooks In an end attachment mounting device for a construction machine having a rod and a lock block for preventing loose rotation of the screw rod, the lock block width and the outer circumference near an end of the screw rod on the fixed support plate side are provided. Two annular grooves spaced at the same interval are provided, the lock block is fitted between the two annular grooves of the screw rod, and two retaining rings are fitted into the two annular grooves, respectively. hand The secure the lock block, there is provided an end attachment mounting system for a construction machine that prevents falling out of the lock block.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, the same components as those of the above-mentioned apparatus according to the earlier application of the present applicant are denoted by the same reference numerals, and FIG.
Since FIG. 5 and FIG. 5 are common to the present invention, these drawings will be described at the same time.

1 to 5, an end attachment mounting apparatus 1 includes brackets 4 and 4 connected to a front end of a boom 2 and a front link 3 of a construction machine.
Fixed support plates 6 and 6 fixed to the brackets 4 and 4 and having hooks 5 and pins 7 fixed to the brackets 4 and 4 are provided rotatably on the brackets 4 and 4, The fixed support plates 6 and 6 are rotatable by rotating support plates 9 and 9 having hooks 8 and pins 28 and 28 fixed to the fixed support plates 9 and 9 by cold fitting or press fitting. , The block 12 supported by the rotary support plate 9,
Pins 29, 29 fixed to 9 by cold fitting or press fitting
A block 15 rotatably supported by the rotation support plates 9, 9, and the block 15 and the block 12.
And a lock block 11 for preventing the screw rod 10 from loosening and rotating.

Here, the brackets 4 and 4 are
0 is connected to the tip of the boom 2 of the work machine,
1 is connected to the front link 3. The brackets 4 and 4 are fixedly provided by a member 32.
The fixed support plates 6 and 6 are fixed to the lower side, and the rotation support plates 9 and 9 are rotatably provided by pins 7. The hooks 5 and 8 that can be engaged with the pins 26 and 27 of the end attachment 25 are fixedly provided outside the lower portions of the fixed support plates 6 and 6 and the rotation support plates 9 and 9, respectively.

The block 12 is rotatably fixed between the fixed support plates 6, 6 by being supported by pins 28, 28 from both ends. That is, the tip portions 28a, 28a of the pins 28, 28 are provided on both sides in the longitudinal direction of the block 12.
Are provided with engagement holes 12b, 12b having a diameter larger than the diameter of the pins 28,
The heads 28b, 28b of the pins 28 are fixed by cold fitting or press-fitting, and the block 12 is rotatably supported between the tips 28a, 28a of the pins 28, 28.
In addition, a U-shaped groove 1 is formed in the right side of the block 12 at a substantially central portion of the block 12 and provided with a through hole 12a in the width direction thereof so as to surround the through hole 12a.
3 is fixedly provided. The through-hole 12a is provided with a large-diameter hole in a left portion (not shown), and the through-hole 12a is formed in two stages, a small-diameter portion and a large-diameter portion.

In the same configuration, a block 15 is rotatably supported between the rotation support plates 9 by pins 29. That is, engagement holes 15b, 15b having a diameter larger than the diameters of the tips 29a, 29a of the pins 29, 29 are provided on both sides in the longitudinal direction of the block 15, and the rotation support plates 9, 9 are provided. The heads 29b, 29b of the pins 29, 29 are fixed by cold fitting or press fitting, and the block 15 is rotatably supported between the tips 29a, 29a of the pins 29, 29. Block 1
5 is provided with a screw hole 15a at a substantially central portion of the block 15 in a width direction thereof.
A screw cover 33 having a cylindrical shape is fixed to the left side surface of the cover.

On the other hand, the block 12 and the block 1
A screw 16 for screwing with a screw hole 15a is formed at one end of the screw rod 10 for connecting and connecting the hooks 5 and 8 to expand and contract the distance between the hooks 5 and 8, and a regular hexagonal prism at the opposite end. In the vicinity of the regular hexagonal column 17 (on the left side in FIG. 1), a round shaft portion 34 having a smaller diameter than the small diameter portion of the through hole 12a of the block 12 and the large diameter of the through hole 12a are provided. A round shaft portion 18 having a smaller diameter than the diameter portion is provided. The mounting plate 19 is fixed to the block 12 by means of screws, pins, or the like in a state where the round shaft portions 34, 18 of the screw rod 10 are fitted in the through holes 12a of the block 12. Thereby, the axial movement of the screw rod 10 is restricted.

Further, the regular hexagonal column 17 of the screw rod 10 is
When the screw rod 10 is inserted into the block 12, the regular hexagonal column 17 is formed so as to be located at a position facing the lock plate 14. A regular hexagonal inner hole 20 is formed in the lock block 11, and the regular hexagonal inner hole 20 fits with the regular hexagonal column 17 of the screw rod 10 to regulate the rotation of the screw rod 10. Further, the lock block 11 is formed with a rectangular outer surface 21, which fits with the U-shaped groove 13 of the lock plate 14 to restrict the rotation of the lock block 11.

Further, the fixed support plate 6 of the screw rod 10
Two annular grooves 35 and 36 are provided on the outer periphery near the ends of the regular hexagonal column portion 17 located on the sixth side at the same interval as the width of the lock block 11.

The attachment of the end attachment 25 is performed according to the following procedure. As shown in FIG. 5, the fixing pins 26 of the end attachment 25 are
6 and the end attachment 25
The position of the end attachment 25 and the position of the working machine are adjusted so that the other mounting pin 27 faces the engaging portion of the hook 8 of the rotation support plates 9 and 9. Next, a box wrench or the like is attached to the regular hexagonal column portion 17 of the screw rod 10, and the screw rod 10 is turned to widen the distance between the hooks 5, 8, and the hooks 5, 8 and the mounting pins 26, 27 Are respectively engaged, and the end attachment 25 is fixed to the brackets 4, 4.

Next, the angle of the regular hexagonal column 17 of the screw rod 10 is adjusted and stopped at an angle at which the lock block 11 can be mounted, and the regular hexagonal column 17 provided on the screw rod 10 is stopped.
A general-purpose retaining ring 37 is fitted in the annular groove 35, the lock block 11 is further fitted in the regular hexagonal column portion 17, and the retaining ring 38 is fitted in the annular groove 36. 11 is fitted into the regular hexagonal column 17 of the screw rod 10. The retaining ring 3 fitted in the annular grooves 35, 36
7, 38 are ready-made products, which are formed of a spring material.

With the above operation, the end attachment 25 is attached, and the lock block 11 is connected to the regular hexagonal column 17 and the U-shaped groove 1 of the lock plate 14.
3 to prevent the screw rod 10 from rotating loosely. Further, since the retaining rings 37 and 38 are fitted in the annular grooves 35 and 36 respectively to fix the lock block 11, the lock block 11 does not fall off due to mechanical vibration or the like. Further, when the end attachment 25 is detached, the above-mentioned operation procedure is performed in reverse, so that the detachment operation can be performed easily and quickly as described above.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0024]

According to the present invention, as described in detail in the above-described embodiment, two grooves are provided annularly on the outer periphery of the screw rod near the fixed support plate end at the same interval as the lock block width. A lock block is fitted between the two grooves of the screw rod, and a general-purpose retaining ring is fitted into each of the two grooves to fix the lock block. Blocks are prevented from falling off. In this way, the attachment and detachment of the lock block can be performed quickly, and therefore, the replacement work of the end attachment is facilitated. In addition, since the retaining ring uses an off-the-shelf product, the prior application of the present applicant using a snap ring is used. This is an invention that has a very significant effect, such as an extremely inexpensive configuration as compared with the one described above.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is an exploded view of a screw rod and a block supporting the screw rod of an end attachment mounting device of a construction machine.

FIG. 2A is a partially enlarged longitudinal sectional view showing a state before a lock block and a retaining ring are fitted to a screw rod of the end attachment mounting device shown in FIG. 1; (B) A partially enlarged longitudinal sectional view showing a state after a lock block and a retaining ring are fitted to a screw rod of the end attachment mounting device shown in FIG. 1.

FIG. 3 is a perspective view of a retaining ring fitted to a screw rod of the end attachment mounting device shown in FIG. 1;

FIG. 4 is a perspective view of an end attachment mounting device according to the earlier application of the present applicant.

FIG. 5 is a side view showing a state where an end attachment is to be mounted on the end attachment mounting device of FIG. 4;

FIG. 6 is an exploded view of a screw rod and a block supporting the screw rod of the end attachment mounting device shown in FIG. 5;

7A is a partially enlarged longitudinal sectional view showing a state before a lock block is fitted to a screw rod of the end attachment mounting device shown in FIG. 6; FIG. 7 (B) is a partially enlarged longitudinal sectional view showing a state after the lock block is fitted to the screw rod of the end attachment mounting device shown in FIG. 6.

8 is an enlarged perspective view of a snap ring mounted on a lock block of the end attachment mounting device shown in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 end attachment mounting device 2 boom 3 front link 4 bracket 5, 8 hook 6 fixed support plate 7 pin 9 rotation support plate 10 screw rod 11 lock block 35, 36 annular groove 37, 38 retaining ring

Claims (1)

[Claims] 1. A bracket connected to a tip end portion and a front link of a boom of a construction machine, a fixed support plate fixed to the bracket and having a hook, and a pin fixed to the bracket. A construction machine rotatably provided on a bracket and having a rotation support plate having a hook, a screw rod for expanding and contracting a distance between the hooks, and a lock block for preventing loose rotation of the screw rod. In the end attachment mounting device of (2), two annular grooves are provided on the outer periphery near the end of the screw rod on the side of the fixed support plate at the same interval as the lock block width, and two annular grooves of the screw rod are provided. The lock block is fitted between the grooves, and two retaining rings are fitted into the two annular grooves, respectively.
An end attachment mounting device for a construction machine, wherein the lock block is fixed to prevent the lock block from falling off.