JPS6231513Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to crush rocks, paved roads, buildings, etc.
The device is used for destruction, and more specifically, a ram is provided on the side opposite to the direction of impact of the ram on the side of the case body in which a ram for impact against the chisel is slidably installed. An accumulator is provided in the ram to store force as the ram moves in the reverse direction, and when the amount of movement of the ram in the reverse direction exceeds a certain value, the ram stores power in the accumulator to move the ram toward the striking direction. The present invention relates to a hydraulic crushing device that is equipped with a relatively movable valve body that operates to automatically communicate an upstream chamber and a downstream chamber that sandwich a ram in order to reversely move the ram.

Conventional hydraulic crushing devices of this type, for example,
As shown in the figure, a valve body 3 installed inside the ram 2 is provided at the axial center of the ram 2 and has an extremely small diameter. The seat 2A also has a small diameter and the valve chamber 2B itself has a small cross-sectional area. In addition, the flow passage 2c formed in the ram 2 to communicate the valve chamber 2B and the intermediate chamber _S2 is inclined with respect to the axis of the ram 2. In addition to this, the number of holes formed cannot be too large, so the total cross-sectional area of the flow path inevitably becomes small, which causes resistance when the ram 2 moves in the striking direction, and eventually causes loss of striking energy. I was getting used to it. That is, from the time when the valve body 3 is opened, the ram 2 moves in the striking direction X, opens the outflow hole 1b,
Until the ram 2 hits the chisel 8, the working liquid (oil) in the upstream chamber _S1 and the intermediate chamber _S2 flows through the flow path 2.
c to the downstream chamber _S3 , and together with the working liquid that has flowed into the downstream chamber _S3 from the accumulator A, the outflow hole 1
However, since the valve chamber 2B and the flow path 2c are in the above-mentioned state, the upstream chamber
The valve chamber 2B and the flow path 2c provide a large resistance to the working fluid flowing into the downstream chamber S ₃ from the intermediate chamber S ₁ and the intermediate chamber S ₂ , and this exerts resistance on the movement of the ram 2, resulting in impact energy loss to the chisel 8. He was inviting them. This problem tends to become more pronounced as the device becomes smaller, that is, the case body 1 has a smaller diameter.

In view of the above-mentioned problems, the present invention aims to significantly reduce flow path resistance with only relatively simple structural improvements, thereby increasing impact energy and contributing to energy saving. The purpose is to

The hydraulic crushing device according to the present invention has the above-mentioned configuration, and the valve body and the corresponding valve seat on the ram side are closely spaced and separated from each other at a position relatively close to the outer peripheral surface of the ram. It is characterized by being configured as follows.

In other words, the valve chamber that houses the valve body and faces the valve seat can be configured to have a large cross-sectional area, and the flow path that communicates this valve chamber and the intermediate chamber can also be formed along the ram axis direction. It is easy to adopt a configuration in which a large number of channels are formed along or almost along the same axis, and each channel has a relatively large cross-sectional area, and as a whole, the total channel cross-sectional area is sufficiently large to increase the channel resistance. This has made it possible to significantly reduce the impact energy, thereby increasing impact energy and contributing to energy conservation.

Embodiments of the present invention will be described below based on the drawings.

1 mounts a chisel 8 so as to be slidable with a part of the chisel 8 protruding outside;
A case body in which a striking ram 2 is slidably housed, a piston 7 is slidably housed in the opposite side of the case body 1 from the chisel 8, and a cylinder chamber Cy is formed in the upper part of the case body 1. Therefore, it is designated as accumulator A.

Reference numeral 3 denotes a valve body that is relatively slidably installed inside the ram 2, and the valve body 3 and the corresponding valve seat 2A on the ram 2 side are closely connected to each other at a position relatively close to the outer peripheral surface of the ram 2. The key point of the present invention is that it is configured to be spaced apart. Specifically, a valve chamber 2B facing the valve seat 2A is formed in an annular shape near the outer peripheral surface of the ram 2, and an annular valve body 3 is housed inside the annular valve chamber 2B. 4 is a piston that is raised to close the valve body 3, and as shown in FIG. Working fluid pressure introduction channel 2a
is formed on the ram 2. An air chamber 5 is formed in the ram 2 at a position inside the valve body 3, and a passage 2b is formed in the ram 2 that communicates the air chamber 5 with the atmosphere through a gap around the chisel 8.

Inside the case body 1, there are hydraulic upstream chambers S ₁ , intermediate chambers S ₂ ,
A downstream chamber _S3 is formed. When the valve body 3 is in the closed state, a plurality of vertical grooves are intermittently formed in the outer peripheral surface of the ram 2 as a flow path 6 for introducing hydraulic pressure from the upstream chamber S ₁ to the intermediate chamber S ₂ . has been formed.
Some of the channels 6a are particularly long for constant communication. As shown in FIG. 6, flow passages 2c communicating between the intermediate chamber _S2 and the valve seat 2B are formed at multiple locations in the circumferential direction of the ram 2 near its outer circumferential surface and along the axial direction of the ram 2. There is.

9 is a receiving function of the piston 7 and the valve body 3
A communication hole 9a is formed with a receiving plate that also functions to stop and open the valve. 10 is a piston ring, 1a and 1b are pump P, an inflow hole and an outflow hole communicating with tank T, 11 is a start/stop operation valve, 12
13 is a relief valve, and 13 is a check valve.

Next, the operation of the hydraulic crushing device having the above configuration will be explained.

(1) When the operation valve 11 is operated to communicate the pump P with the case body 1, pressure oil from the pump P flows into the upstream chamber _S1 , and a part of it pushes up the piston 4 through the flow path 2A. , the valve body 3 is also pushed up and closed. A portion flows into the intermediate chamber _S2 via the longer channel channel 6a.

(2) When the valve body 3 closes, the internal pressure in the intermediate chamber _S2 increases, causing the ram 2 to rise. As the ram 2 rises, the number of groove passages 6 communicating with the intermediate chamber _S2 increases, resulting in an increase in the amount of pressurized oil flowing in and a decrease in pressure drop in the groove passages 6. In other words, the oil pressure effectively acts to raise the ram 2. During this time, the oil in the downstream chamber _S3 returns to the tank T via the outflow hole 1b. A portion of the valve body 3 protrudes above the upper end surface of the ram 2.

(3) When the ram 2 rises by a certain amount, the ram 2 closes the outflow hole 1b (see Figure 2), but the piston 7 is pushed up just before the blockage, and the piston 7 is pushed up strongly immediately after the blockage. Therefore, the gas in the cylinder chamber Cy is compressed. In other words, the power is stored in the accumulator A.

(4) The ram 2 rises further and the protruding part of the valve body 3 comes into contact with the receiving plate 9, but the ram 2 continues to rise, so the valve body 3 is opened (see Fig. 3), and the downstream chamber S ₃ is communicated with the upstream chamber S ₁ via the intermediate chamber S ₂ , resulting in
The downward pushing force due to the pressure in the downstream chamber S3 acting on the valve body ₃ exceeds the upward pushing force due to the pressure in the intermediate chamber _S2 . Therefore, the accumulated pressure of the accumulator A is activated against the ram 2, and the ram 2 rapidly reverses movement toward the striking direction (see FIG. 4) and strikes the chisel 8 (see FIG. 5).

From the time when the valve opens in FIG. 3 until the ram 2 opens the outflow hole 1b in FIG. 4 and hits the chisel 8, oil in the intermediate chamber _S2 passes through the flow path 2c and the valve chamber 2B. The liquid then flows into the downstream chamber _S3 , and as a result, the ram 2 is lowered. Since the cross-sectional area of the valve chamber 2B and the total cross-sectional area of the flow path 2c are large, the oil transfer occurs more smoothly with less resistance, and the ram 2 descends rapidly with less kinetic energy loss. Then, Chisel 8 was hit powerfully. At the moment of impact, some accumulated pressure energy remains in the accumulator A, and oil quietly flows out from the outflow hole 1b until this energy becomes zero.

Note that the state shown in FIG. 5 is switched to the state shown in FIG. 1 by applying a mechanical downward force to the main body 1.

After being struck by the chisel 8, the ram 2 stands still under the cushioning action of the diaphragm 14 in the state shown in FIG.

Note that it is effective to further reduce the resistance by configuring the lower end of the flow path 2c to be straight as shown in FIG.

Further, the piston 4 for pushing up the valve body 3 does not have to be separate from the valve body 3, and may be replaced by a pin (not shown) integrally projecting from the bottom surface of the valve body 3. It is. Further, the valve body 3 does not have to be (circular) annular, and may be solid.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the hydraulic crushing device according to the present invention, and FIGS. 1 to 5 are longitudinal cross-sectional views showing the structure and sequential operation, and FIG. 6 is a cross-sectional view taken in the direction of the - line arrow in FIG. FIG. 7 is a partial sectional view of an applied example, and FIG. 8 is a longitudinal sectional view of a conventional device. 1...Case body, 2...Ram, 2A...Valve seat, 3...Valve body, 8...Chisel, A...Accumulator, _S1 ...Upstream chamber, _S3 ...Downstream chamber.

Claims (1)

[Claims for Utility Model Registration] A ram based on continuous hydraulic pressure supply is provided on the opposite side of the impact direction of the ram 2 of the case body 1 in which the impact ram 2 for the chisel 8 is slidably installed. An accumulator A is provided that stores power as the ram 2 moves in the reverse direction, and when the amount of reverse movement of the ram 2 exceeds a certain value, the accumulator A stores power. A hydraulic crushing device in which a valve body 3 is relatively movably installed and operates to automatically communicate between an upstream chamber _S1 and a downstream chamber _S3 that sandwich the ram 2 in order to reversely move the ram 2 in the striking direction. It is characterized in that the valve body 3 and the corresponding valve seat 2A on the ram 2 side are configured to be in close contact with each other and to be separated from each other at a position relatively close to the outer peripheral surface of the ram 2. Hydraulic crushing equipment. The hydraulic crushing device according to claim 1, wherein the valve body 3 is formed into an annular shape whose wall thickness is considerably smaller than its outer diameter.