JPS59199923A - Breaker-fitting front for oil-pressure shovel - Google Patents

Abstract

PURPOSE:To increase the advancing amount of a breaker regardless of the heights of ceiling by a method in which an angular bracket is slidably inserted into an angular second fitting arm, and the breaker is attached to the bracket. CONSTITUTION:The first fitting arm 12 is rotatably attached to the upper slewing part 2 of an oil-pressure shovel body 1, and a cylinder 13 for operating the first fitting arm is provided between the first fitting arm 12 and the upper slewing part 2. The second fitting arm 14 of an angular cylinder form is attached to the other end of the first fitting arm 12, and the second fitting arm-operating cylinder 15 is provided between the second fitting arm 14 and the first fitting arm 12. A bracket 11 of an angular cylinder form is slidably inserted into the second fitting arm 14, a cylinder 12 for reciprocally moving the breaker is provided between the bracket 11 and the second fitting arm 14, and the breaker 10 is integrally attached to the bracket 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting front dedicated to a breaker for mounting a breaker on a hydraulic excavator.

As shown in FIG. 1, a hydraulic excavator generally consists of an upper revolving body 2 and a lower traveling body 3, and one end of a long dogleg-shaped boom 4 is attached to the upper revolving body 2 by means of a pin. A boom operation cylinder 5 is interposed from the side between the boom 4 and the upper revolving structure 2, and one end of the arm 6 is rotatably attached to the other end of the boom 4 by a pin. An arm operating cylinder 7 is provided between the arm 6 and the boom 4.
is interposed from above, a link 8 is attached to the other end of the arm 6, a packet operation cylinder 9 is interposed from above between the link 8 and the arm 6, and a packet (not shown) is attached to the link 8. ) and is mainly used to excavate the ground. When breaking the ground (particularly rock, etc.) using the force 1/- force 10 in such a hydraulic excavator, the packet is removed from the link 8, the breaker 10 is attached to the link 8, and the ground is broken.

However, the front for mounting the breaker in the above-mentioned hydraulic excavator has a long overall length because it is used for a packet for excavating the ground. Therefore, it has the following drawbacks.

1. Because the front is long, the working range is limited.

For example, at a work site with a low ceiling height (underground structure or tunnel), a small hydraulic excavator must be used, and it is difficult to use a hydraulic excavator suitable for the work site.

2. Since the front section for mounting the breaker is long, as shown in Figure 2, when crushing the ceiling, the hydraulic excavator body 1
When the breaker 10 remains stopped, the amount of advance t of the breaker 10 is small and the crushing ability is poor.

Therefore, when the hydraulic excavator body 1 is advanced, the amount t of the breaker 10 is determined by the amount of advance of the hydraulic excavator body 1.
need to be supplemented.

3. Work operation of breaker 1o and hydraulic excavator body 1
Because the forward operation of the hydraulic excavator 1 is performed at the same time, operability is poor.Since the front for mounting the breaker is long, the distance between the work point of the breaker 1 and the fixed point of the hydraulic excavator body 1 is particularly important when crushing ceilings and sides. is long, so the breaker is 1o
The vibrational reaction force exerts a large force on the hydraulic excavator main body 1, and the force exerted by the force trying to lift the hydraulic excavator main body 1 has a large effect on the life of the hydraulic excavator main body 1.

The present invention aims to provide a front for mounting a breaker in a hydraulic excavator which improves the above-mentioned drawbacks.

The present invention is a mounting front dedicated to a breaker, in which one end of a first mounting arm is pivotally supported on an upper rotating body of a hydraulic excavator main body, and a first mounting arm is provided between the first mounting arm and the upper rotating body.
A cylinder for operating the second mounting arm is interposed, one end of the second mounting arm is pivotally supported on the other end of the first mounting arm, and a cylinder for operating the second mounting arm is provided between the second mounting arm and the first mounting arm. The present invention is characterized in that a cylinder is equipped with a valve, a breaker is disposed on the second mounting arm so as to be retractable, and a cylinder for pushing the breaker is installed between the breaker and the second mounting arm.

Hereinafter, an embodiment of the breaker mounting front of the hydraulic excavator of the present invention will be described with reference to FIGS. 6 and 4. FIG.

In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

Therefore, in this embodiment, the breaker mounting front of the present invention has one end of the short linear first mounting arm 12 rotatably mounted on the upper revolving body 2 of the hydraulic excavator main body 1, and A first mounting arm operating cylinder 13 is interposed between the first mounting arm 12 and the upper revolving body 2 from the side. One end of a second mounting arm 14 having a rectangular cylindrical shape with one end closed and the other end open is rotatably attached to the other end of the first mounting arm 12, and the second mounting arm 1
A second mounting arm operating cylinder 15 is interposed between the second mounting arm 4 and the first mounting arm 12 from below. A rectangular cylindrical bracket 11 is slidably inserted into the second mounting arm 14, and a breaker pushing cylinder 12 is interposed from the side between the bracket 11 and the second mounting arm 14. Attach the breaker 10 integrally to the

Since the breaker mounting front of the present invention in this embodiment has the above configuration, the breaker 10 can be pushed back by extending and contracting the breaker pushing cylinder 12. Therefore, it can be widely used in work sites with high ceilings and work sites with low ceilings. In addition, the length can be made shorter than the conventional breaker mounting front, and therefore the distance between the work point of the breaker 10 and the fixation of the hydraulic excavator main body 1 is short when crushing the ceiling or side surface. The vibrational reaction force of the breaker 10 is not greatly applied to the hydraulic excavator main body 1, and the influence on the life of the hydraulic excavator main body 1 is small. Furthermore, since the breaker 10 is pushed back, the amount of advance of the breaker 10 can be increased, and the crushing ability can be improved. Moreover, the operation of the breaker 10 and the operation of the hydraulic excavator main body 1 can be performed separately, resulting in good operability.

In particular, in this embodiment, the second mounting arm operating cylinder 15 is operated from the bottom, and the breaker pushing cylinder 1 is
1 was inserted from the side, so these cylinders 1
There is no possibility of damaging the 5°11 by hitting it against the ceiling.

As is clear from the above embodiments, the breaker mounting front in the hydraulic excavator of the present invention is dedicated to the breaker, so its overall length can be made shorter than the conventional breaker mounting front dedicated to the packet. , and the breaker can be pushed back. Therefore, the following effects can be achieved.

1. It can be used in a wide range of situations, including work sites with high ceilings and work sites with low ceilings.

2. The vibrational reaction force of the breaker that is applied to the hydraulic excavator body is small.

6. The amount of advance of the breaker can be increased.

4. The operation of the breaker and the operation of the hydraulic excavator body can be made separate.

[Brief explanation of drawings]

FIG. 1 is a side view of the entire hydraulic excavator showing the conventional front part for mounting a breaker, and FIG. 2 is a diagram of the hydraulic excavator in use. 6th
4 and 4 show an embodiment of the front for mounting a breaker in the hydraulic excavator of the present invention, FIG. 6 is a side view of the entire hydraulic excavator, and FIG. 4 is a view taken in the direction of the arrow ■ in FIG. 1... Hydraulic excavator main body, 2... Upper revolving body, 3...
...Lower traveling body, 10...Breaker, 11...Bracket, 12...Cylinder for pushing back breaker, 13...
- Cylinder for operating the first mounting arm, 14...Second mounting arm, 15...Cylinder for operating the second mounting arm. Patent Applicant Hitachi Construction Machinery Co., Ltd. Agent Patent Attorney Tadashi Akimoto Jitto 1 Figure 1 Figure 2 Figure 3 Figure 0 / Figure 4

Claims (1)

[Claims] 51. A hydraulic excavator comprising an upper rotating body and a lower traveling body, wherein one end of a first mounting arm is pivotally supported on the upper rotating body, and the first mounting arm and the upper rotating body are connected to each other. A first mounting arm operating cylinder is interposed therebetween, one end of a second mounting arm is pivotally supported on the other end of the first mounting arm, and a second mounting arm is provided between the second mounting arm and the first mounting arm. A cylinder for operating the mounting arm is interposed, a breaker is disposed on the second mounting arm so as to be retractable, and a cylinder for pushing the breaker is interposed between the breaker and the second mounting arm. Front for mounting a breaker on a hydraulic excavator. 2. The front for mounting a breaker in a hydraulic excavator according to claim 1, wherein the cylinder for operating the second mounting arm is interposed from the bottom surface. 6. The front for mounting a breaker in a hydraulic excavator according to claim 1 or 2, wherein the cylinder for pushing back the breaker is interposed from the side.