JPS5819436B2 - Hydraulic breaker or hydraulic rock drill equipped with a two-stage piston mechanism and a control valve linked to it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic breaker or a hydraulic rock breaker, and more particularly to a hydraulic breaker 1 or a hydraulic rock breaker equipped with a two-stage piston mechanism and a control valve interlocked therewith.

The hydraulic breaker Yasaku Iwatsuki is about three times more efficient than the one that uses compressed air, significantly improving work efficiency, but the present invention is a hydraulic breaker with excellent performance.
This system was created with the aim of improving the conventional configuration of the hydraulic pump Iwatsuki, and in particular improving the pressure oil flow path to streamline the oil flow within the cylinder and further improve overall efficiency. .

Conventional hydraulic breakers have a piston and a control valve installed in parallel in the same narrow cylinder, with the pressure oil supply port and oil drain port being perpendicular to the axial direction of the piston. The area of the oil drain port could not be taken up sufficiently, and therefore the flow of pressure oil within the cylinder lacked smoothness, resulting in poor impact efficiency of the machine.

The present invention eliminates the deficiencies of conventional hydraulic breakers or hydraulic breakers by providing a control valve outside the cylinder, and the gist thereof is as follows.

That is, in the present invention, the piston in the main body cylinder is provided with a step so that the upper part is a small piston and the lower part is a large piston, and the pressure oil supply and discharge ports are arranged in the same axial direction as the two-stage piston. A control valve is installed around the rond protruding from the tip of the small piston, and the control valve is inserted into the pressure oil passage that pushes down the second-stage piston, near the bottom dead center of the second-stage piston. It is operated by pressure oil at
This is a hydraulic breaker or hydraulic rock hammer equipped with a two-stage piston mechanism and a control valve linked thereto, which is characterized in that the control valve is released by the rise of the stage piston.

Next, a specific configuration of the present invention will be explained with reference to the drawings, taking a hydraulic breaker as an example.

In the figure, 1 is the breaker main body cylinder, 2 is the stepped part 3
A two-stage piston shaped upwardly and divided into a large piston 2a and a small piston 2b moves up and down to strike the chisel 4.

Therefore, the second stage piston 2 has a neck 5 below the stage 3.
A pressure oil inlet gap 7 for the piston to rise is formed between the lower small diameter portion 2' and the cylinder inner wall 6, and pressure is created from the upper circumferential side of the breaker main body cylinder 1 along the axial direction of the piston. A supply passage 10 is provided which communicates the oil supply passage 8 with the piston-raising oil entry gap 7 and also with the piston-lowering pressure oil entry gap 9 formed above the step portion 3.

The area 9 of the upper step portion 3 is larger than the area 70 of the piston upper/external oil inlet gap 70.

A rod 11 is integrally protruded from the upper end of the two-stage piston 2, and a cylindrical control valve 12 is slidably fitted around the rod 11.

This control valve 12 has a two-stage piston 20 neck 5
An oil passage 13 that communicates with the oil passage 13 is introduced into the upper end, and when pressure oil enters the oil passage 13, it descends due to the pressure and flows to the pressure oil supply port 14 of the piston.
It's like blocking it.

Also, the intermediate part of the cylinder inner wall 6 and the control valve 1
2 are located in a wide gap 15, each of which communicates with an oil drain passage 16.

In the figure, 17 is an accumulator formed in the middle of the pressure oil supply passage 8, the inside of which is filled with nitrogen gas, and the diaphragm 18
This acts to cut off the nitrogen gas and oil and replenish the required amount of oil.

Furthermore, in order to smoothly perform switching by the downward movement of the control valve 12, a plurality of rods are disposed above the control valve 12 and are accommodated in a branch 20 communicating with the pressure oil supply passage 8. Press.

The operating state of the hydraulic breaker according to the present invention having the above configuration will be explained below.

FIG. 1 shows a state in which the second stage piston 2 is at the top dead center, where the pressure oil P has entered the intrusion gap 7, the control valve 12 has opened the pressure oil supply port 14, and the second stage piston 2 Between the small piston 2b and the main body 1, pressure oil P enters the intrusion gap 9 above the piston 2 through a narrow gap, and the intrusion gap 7
The two-stage piston is lowered due to the difference in area between
2 and lowers the valve 12.

Therefore, since the pressure oil supply port 14 is closed by the control valve 12 (see FIG. 3), the oil is cut off from the inlet gap 9, enters the inlet gap 7 below, and the oil in the inlet gap 9 is drained from the oil drain passage 16. The piston 2 rises.

With this operation, the oil passage 13 is closed and the oil in the oil passage 13 is also discharged, and since the upper end of the piston pushes up the control valve (see Figure 4), the pressure oil supply port 14 opens and returns to the state shown in Figure 1. Ru.

The above operations are repeated to apply striking force to the chisel, and according to the present invention, pressure oil is applied above and below the piston.

In addition, since the pressure oil in the cylinder is supplied and discharged in the axial direction to the piston, the flow of pressure oil in the cylinder is smooth, and the area of the oil drain port of the control valve that works with the two-stage piston can be made sufficiently wide, so that the control valve This makes it possible to provide a breaker or rock drill with extremely high efficiency (in other words, a breaker or rock drill with an extremely high number of strikes and excellent performance).

Moreover, the effect is that the operation is performed accurately and smoothly.

[Brief explanation of drawings]

The drawings show an embodiment of a hydraulic breaker or breaker equipped with a two-stage piston mechanism and a control valve linked thereto according to the present invention. Fig. 2 is a longitudinal sectional front view showing the piston in its bottom dead center, that is, the state at the time of impact, Fig. 3 is a longitudinal sectional front view showing the piston rising from the bottom dead center, and Fig. 4 shows the piston. FIG. 6 is a longitudinal sectional front view showing a state in which the control valve is started to be pushed up by the small histone. 1...°Breaker - body cylinder, 2...
...Two-stage piston, 2a...Large piston, 2b
...Small piston, 3...Stepped part, 4...
...Chisel, 6...Inner wall, 7...
Pressure oil entry gap for piston elevation, 8...Pressure oil supply passage, 9...Pressure oil entry gap for piston descent, 10...Oil supply passage, 12... ...Control valve, 13...Oil passage, 14...
...Pressure oil supply port.

Claims (1)

[Claims] 1. A piston in the main body cylinder is provided with a stepped part to form a two-stage structure with a small piston at the top and a large piston at the bottom, and pressure oil supply and discharge ports are provided in the same direction as the axial direction of the two-stage piston, In addition, a control valve is installed around the rond protruding from the tip of the small piston, and the control valve is inserted into the pressure oil passage that presses down the second-stage piston.
Operated by pressure oil near the bottom dead center of the stage piston,
A hydraulic breaker or hydraulic brake Iwatsuki is equipped with a two-stage piston mechanism and a control valve linked thereto, which is characterized by cutting off the supply of pressure oil to the second-stage piston and releasing the control valve when the second-stage piston rises. .