JPS5851252Y2 - Hydraulic cylinder mounting device for leveling hydraulic excavators - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic excavator, and more particularly to a hydraulic excavator equipped with a leveling hydraulic cylinder and capable of linearly moving a packet.

Figure 1 shows a general hydraulic excavator that is not equipped with a hydraulic cylinder for leveling, 1 is a running body, 2 is a revolving body mounted on the traveling body 1 so that it can turn, and 3 is a swinging body that can be raised and raised on the front part of the revolving body 2. 4 is a hydraulic cylinder for raising and lowering the boom,
5 is an arm pivotally attached to the tip of the boom 3; 6;
7 is a hydraulic cylinder for swinging the arm, 7 is a packet rotatably attached to the tip of the arm 5, and 8 is a hydraulic cylinder for rotating the packet.

In this hydraulic excavator, in order to excavate by moving the packet 7 linearly, it is necessary to operate the arm hydraulic cylinder 7 and the boom hydraulic cylinder 4 at the same time.
The operation requires skill, and the flatness of the excavated surface is likely to be extremely inaccurate.

A hydraulic excavator shown in FIG. 2 has been realized to solve the above-mentioned problems.

That is, in this hydraulic excavator, a leveling hydraulic cylinder 9 is connected and provided between the boom 3 and the arm 5', and the bottom side oil chamber of the leveling hydraulic cylinder 9 and the bottom side oil chamber of the boom hydraulic cylinder 4 are connected. The rod-side oil chamber of the level hydraulic cylinder 9 and the rod-side oil chamber of the boom hydraulic cylinder 4 are connected through hoses 10 and 11, respectively.

Therefore, in the above-mentioned hydraulic excavator, the packet 7 can be moved in a straight line only by operating the arm hydraulic cylinder 6, and the problems of the hydraulic excavator without the leveling hydraulic cylinder 9 can be solved.

However, in this hydraulic excavator, mounting fulcrums for the leveling hydraulic cylinder 9 are required on the boom 3 and arm 5', and in particular, in order to secure the mounting fulcrum on the arm 5 side,
Conventionally, as shown in the drawings, a protrusion 5a was provided at the base of the arm 5', and a rod of a leveling hydraulic cylinder 9 was pivotally attached to the protrusion 5a.

As a result, an arm having a special shape must be used as the arm 5', resulting in increased costs and poor compatibility.

In particular, when the level hydraulic cylinder 9 is attached to the hydraulic excavator shown in Fig. 1 and it is attempted to move the packet in a straight line only by operating the arm hydraulic cylinder 6, the specially shaped arm 5' (Fig. 2) ), it is also necessary to remove the packet 7, packet hydraulic cylinder 8, links, etc. from the arm 5 (Fig. 1) and attach them to the arm 5', making the replacement work extremely troublesome. Met.

The purpose of this invention is to make it possible to secure a mounting fulcrum for a level hydraulic cylinder without making the arm into a special shape.
An object of the present invention is to provide a hydraulic cylinder mounting device for leveling a hydraulic excavator which eliminates the drawbacks of the prior art.

In order to achieve this purpose, the leveling hydraulic cylinder mounting device for a hydraulic excavator of the present invention removably mounts the mounting bracket of the leveling hydraulic cylinder on the arm, and attaches one end of the leveling hydraulic cylinder to the mounting bracket. and the other end is connected to the boom.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a side view showing the backhoe attachment portion of the hydraulic excavator according to the present invention, and FIG. 4 is a sectional view taken along line AA in FIG. 3.

In the figure, 11 is a traveling body, 12 is a revolving body rotatably mounted on the traveling body 11, 13 is a boom pivotably mounted on the front part of the revolving body 12 via a pin P1, and 14 is a boom. The hydraulic cylinder 14 is a hydraulic cylinder for elevating.
The base of the rod 14a is connected to the front part of the rotating body 12 via a pin P2, and the tip of the rod 14a is connected to the intermediate part of the boom 13 via a pin P3.

Reference numeral 15 indicates an arm pivotally attached to the tip of the boom 13 via a pin P4, and reference numeral 16 indicates a hydraulic cylinder for swinging the arm. The ends of the rods 16a are respectively connected to the bases of the arms 15 via pins P6.

17 is a packet rotatably attached to the tip of the arm 15 via a pin P7; 18 is a hydraulic cylinder for rotating the packet; the base of the hydraulic cylinder 18 is attached to a pin P8;
The rod 18a is connected to the intermediate portion of the arm 15 via a link L, and the tip of the rod 18a is connected to the packet 17 via a link L.

A level hydraulic cylinder 19 is disposed between the boom 13 and the arm 15, and the bottom oil chamber of the hydraulic cylinder 19 is connected to the boom hydraulic cylinder 1 via a hose 20.
The bottom side oil chamber of No. 4 and the rod side oil chamber are connected to the rod side oil chamber of the boom hydraulic cylinder 14 via a hose 21, respectively.

However, in the hydraulic excavator according to the present invention, the mounting bracket 22 of the leveling hydraulic cylinder 19 is removably attached to the side surface of the base of the arm 15, and the tip of the rod 19a of the leveling hydraulic cylinder 19 is attached to the mounting bracket 22. The cylinder bases are respectively connected to the intermediate portions of the boom 13 via pins P9.

To explain in detail, the mounting bracket 22 is formed of a triangular plate member, and has the tip of a pin P5 that pivotally connects the arm 15 to the boom 13 at its first apex, and the second apex that projects downward from the arm 15. It is attached to the arm 15 by inserting the ends of pins P6 that connect the rod ends of the arm hydraulic cylinder 16 to the arm 15, respectively, and the rod 1 of the level hydraulic cylinder 19 is attached to the third top part.
9a The tips are connected by pin PIO.

Bolts for preventing the mounting bracket 22 and the pins themselves from being removed are respectively inserted into the portions of the pins P5 and P6 that protrude outward from the mounting bracket 22, and by pulling out the bolts from the pins, The mounting bracket 22 can be removed from the arm 15.

As an example, FIG. 4 shows the first top part of the mounting bracket 22, where 23 is a bolt inserted into the pin P5 to prevent removal, and 24 is a nut screwed onto the tip of the bolt 23. .

Therefore, when removing the mounting bracket 22 from the arm 15, the mounting bracket 22 can be removed by removing the nut 24 from the bolt 23 and pulling out the bolt 23 from the pin P5.

Therefore, in the leveling hydraulic cylinder mounting device according to the present invention, there is no need to provide a protrusion on the arm itself to secure a mounting fulcrum for the leveling hydraulic cylinder 19.

That is, it is not necessary to make the arm 15 into a special shape, and costs can be reduced.

In addition, when a normal hydraulic excavator (Fig. 1) which does not have a leveling hydraulic cylinder is equipped with a leveling hydraulic cylinder to provide a linear movement function for the packet 17, the mounting bracket 22 is attached to the arm 15, and the mounting bracket 22 is attached to the arm 15. A leveling hydraulic cylinder 19 may be installed between the metal fitting 22 and the boom 13.

Therefore, there is no need to simultaneously replace a specially shaped arm or replace the packet, packet hydraulic cylinder, link, etc. as in the prior art, and the replacement work is easy.

Furthermore, by changing the position of the rod attachment fulcrum (pin PIO) of the leveling hydraulic cylinder 19 on the mounting bracket 22, the angle of linear movement such as horizontal movement on the ground, 30° slope movement, etc. can be changed. Can be done.

In this case, it is only necessary to replace the mounting bracket 22 with another mounting bracket and change the position of the mounting fulcrum, which is much easier than replacing the arm.

FIG. 5 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. It is located at the point attached according to P8.

In this embodiment as well, the functions and effects of the above-described embodiments can be achieved.

In both of the above-mentioned embodiments, the attachment of the mounting bracket 22 to the arm 15 is performed using a pivot pin between the boom 13 and the arm 15, a connecting pin of the arm hydraulic cylinder 16, and a connecting pin of the packet hydraulic cylinder. However, it may be attached using a separate fixing member such as a pin.

Further, the shape of the mounting bracket 22 is not limited to a triangle, and it goes without saying that it may have another shape.

As explained above, the leveling hydraulic cylinder mounting device of the present invention removably mounts the mounting bracket of the leveling hydraulic cylinder on the arm, connects one end of the leveling hydraulic cylinder to the mounting bracket, and connects the other end of the leveling hydraulic cylinder to the mounting bracket. Since the end portion is connected to the boom, there is no need for the arm to have a special shape as in the prior art, and costs can be reduced.

In addition, even if a normal hydraulic excavator that does not have a leveling hydraulic cylinder is equipped with a leveling hydraulic cylinder to provide a linear packet movement function, attaching a mounting bracket to the arm,
It is only necessary to install a leveling hydraulic cylinder between the mounting bracket and the boom, and this work is extremely easy compared to the prior art.

[Brief explanation of the drawing]

Figure 1 is a side view of a hydraulic excavator equipped with a normal backhoe attachment, Figure 2 is a side view of a conventional hydraulic excavator equipped with a level hydraulic cylinder backhoe attachment, and Figures 3 and 4 are the invention of the present invention. One embodiment is shown, and FIG. 3 is a side view showing a backhoe attachment part equipped with a leveling hydraulic cylinder using the mounting device according to the present invention, FIG. 4 is a sectional view taken along the line A-A, and FIG. It is a side view which shows the backhoe attachment part equipped with the hydraulic cylinder for leveling in other Example of this invention. 11... Traveling body, 12... Rotating body, 1
3... Boom, 14... Hydraulic cylinder for boom elevation, 15... Arm, 16...
... Hydraulic cylinder for arm swing, 17... Packet, 18 Hydraulic cylinder for packet rotation, 19...
...Hydraulic cylinder for level, 19a...Rod, 22...Mounting bracket, 23...Pole for preventing removal), P5. P6. P 8. P9, PIO・
·····pin.

Claims (1)

[Scope of utility model registration request] A rotating body on a traveling body, a boom pivotally attached to the front part of the rotating body, an arm pivotally attached to the tip of the boom, a packet pivotally attached to the tip of the arm, and a boom and an arm. In a hydraulic excavator that is equipped with a leveling hydraulic cylinder connected to the arm and capable of moving a packet in a straight line only by operating the arm hydraulic cylinder, the leveling hydraulic cylinder's mounting bracket is removably attached to the arm, and the leveling hydraulic cylinder is connected to the leveling hydraulic cylinder. A hydraulic cylinder mounting device for a level of a hydraulic excavator, characterized in that one end of the hydraulic cylinder is connected to the mounting bracket, and the other end is connected to a boom.