JPH1058351A - Vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a spool from being moved by large impact force of reciprocation of a piston by providing a spool of a switching valve in such a manner as to freely move between a first position and a second position in the direction orthogonal to the reciprocation of the piston. SOLUTION: A spool 41 of a switching valve 31 is put in a first position to communicate a first port 44 and a second port 45 with each other. The delivery pressure oil of an oil pressure pump 50 is directly supplied to a first chamber 10, and as it flows through a pump port 42, the delivery pressure oil of the oil pump 50 is supplied to a second chamber 11 and a third chamber 12. Thus, the piston 3 is moved downward. When the piston 3 is moved downward by a designated stroke, the first chamber 10 communicates with a drilled hole 20, so that the pressure oil in the first chamber 10 is applied to a first pressure receiving part 38 through a first annular groove 21, thereby pushing a spool 33 to the right to be punt in a second position. Thus, a second port 37 communicates with a tank port 35, so that the pressure oil in the second chamber 11 and the third chamber flows out to the tank and the piston 3 is moved upward by the pressure in the first chamber 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator used for a breaker for performing a crushing operation and a rolling machine for performing a rolling operation.

[0002]

2. Description of the Related Art As a vibration generator, a first chamber and a second chamber are formed by inserting a piston into a cylinder hole of a main body, a pressure receiving area of the first chamber is reduced, and the vibration chamber is constantly connected to a hydraulic pressure source. It is known that the pressure receiving area of the second chamber is increased and the piston is reciprocated in the working direction and the return direction by alternately communicating with the hydraulic pressure source and the tank based on the reciprocating motion of the piston.

[0003]

The reciprocating speed of the piston in the above-mentioned vibration generator is determined by the pressure receiving area and the flow rate of the second chamber. If the flow rate is constant, the reciprocating speed increases as the pressure receiving area decreases. .

Further, the force for moving the piston in the above-mentioned vibration generating device is determined by the pressure receiving area and the pressure of the second chamber. If the pressure is constant, the moving force increases as the pressure receiving area increases.

On the other hand, when used as a breaker, the chisel is struck by the piston, so that the reciprocating speed of the piston is better. When used as a compacting machine, the piston presses the pressure plate, so that the piston moves. The greater the force to do, the better.

For this reason, if the pressure receiving area of the second chamber is reduced so as to be suitable for use as a breaker, the force for moving the piston when used as a rolling machine is reduced, and the pressure receiving area of the second chamber is reduced. If the size is increased so as to be suitable for use as a pressure machine, the reciprocating speed of the piston becomes slow when used as a breaker.

Therefore, the conventional vibration generator cannot be made suitable for both a breaker and a rolling machine.

[0008] As a vibration generating device for solving this problem, the applicant of the present invention has previously made the pressure receiving area of the second chamber larger or smaller by switching the switching valve so that it can be used for both a breaker and a rotary machine. A suitable one was proposed.

[0009]

In the vibration generating device, a large impact force acts on the vibrating portion main body in the vertical vibration direction of the piston. Therefore, when the switching valve is attached to the vibrating portion main body, the switching valve is subjected to a large impact force. There is a risk of malfunction due to switching.

Accordingly, an object of the present invention is to provide a vibration generator capable of solving the above-mentioned problems.

[0011]

The present invention provides a first chamber 10 having a small pressure receiving area and a second chamber 10 having a large pressure receiving area by inserting a piston 3 into a cylinder hole 2 of a vibrating portion main body 1.
A chamber 11 and a third chamber 12 are formed, and pressure oil is constantly supplied to the first chamber 10 and pressure oil is supplied to the second chamber 11 and the third chamber 12 according to the stroke of the piston 3. The piston 3 is configured to reciprocate, and the vibrating portion main body 1 is provided with a switching valve 31 that switches the third chamber 12 between a first position communicating with a hydraulic pressure source and a second position communicating with a tank,
The spool 41 of the switching valve 31 is movable between a first position and a second position in a direction orthogonal to the reciprocating direction of the piston 3 and a holding mechanism 46 for holding the spool 41 at the first position and the second position. The vibration generating device is characterized in that a vibration generating device is provided.

According to the present invention, when the spool 41 is in the first position, the pressure oil is supplied to the second chamber 11 and the third chamber 12, so that the pressure receiving area for moving the piston 3 in one direction is increased. It is suitable as a vibration generator used as a rolling machine.

If the spool 41 is in the second position, the second chamber 1
Since the pressure oil is supplied to only the first chamber 1 and the third chamber 12 communicates with the tank, the pressure receiving area for moving the piston 3 in one direction is reduced, which is suitable as a vibration generator used as a breaker.

Further, since the spool 41 moves in a direction orthogonal to the reciprocating direction of the piston 3, the spool 41 does not move due to a large impact force due to the reciprocating movement of the piston 3.

Therefore, the holding force of the holding mechanism 46 for holding the spool 41 at the first position and the second position can be reduced.
The holding mechanism 46 can be made compact.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
The piston 3 is inserted into the piston hole 2 of the first embodiment, and the rod 6 of the pressing tool 5 is inserted into the guide hole 4 of the vibrating section main body 1 to constitute a rolling machine. In the case of forming a breaker, the rod 6 of the pressing device 5 may be removed and the chisel 7 may be inserted into the guide hole 4.

As shown in FIG. 2, a first chamber 1 for moving the piston 3 upward is provided between the piston hole 2 and the piston 3.
0, a second chamber 11 for moving the piston 3 downward, and a third chamber 12 for moving the piston 3 downward are formed. The pressure receiving area of the second chamber 11 is larger than the pressure receiving area of the first chamber 10.

Next, a specific structure will be described with reference to FIG.
A drill hole 20 is formed in the piston 3, first, second and third annular grooves 21, 22 and 23 are formed in the piston hole 2, and a first slit 24, a second slit 25 and a third slit 26 are formed in the piston 3. Is formed. The vibrating section main body 1 is provided with a main switching valve 30 and a switching valve 31.

The main switching valve 30 has a spool 33 fitted in a spool hole 32, and a pump port 34, a tank port 35, a first port 36,
A second port 37 is formed, and the spool 33 is brought to the first position by the pressure of the first pressure receiving portion 38 having a large pressure receiving area, and to the second position by the pressure of the second pressure receiving portion 39 having a small pressure receiving area.

The switching valve 31 has a spool 41 inserted into a spool hole 40, and a pump port 42, a tank port 43, a first port 44, and a second port 45 are formed in the spool hole 40. Is pressed to the first position and the second position, and is held by the holding mechanism 46.

The holding mechanism 46 urges the rod 47 with a spring 48 to urge the first concave portion 49 and the second concave portion 50 of the spool 41 into engagement.

Next, the specific structure of each part together with the operation will be described. As shown in FIG. 2, the first port 44 and the second port 45 communicate with the spool 41 of the switching valve 31 being in the first position. The discharge pressure oil of the hydraulic pump 50 is supplied directly to the first chamber 10, and the pump port 42, the pump port 34,
Since the fluid flows through the second port 37, the first port 44, and the second port 45, the discharge pressure oil of the hydraulic pump 50 is supplied to the second chamber 11 and the third chamber 12.

As a result, the piston 3 moves downward.

When the piston 3 moves downward by a predetermined stroke, the first chamber 10 communicates with the drill hole 20, and the pressure oil in the first chamber 10 acts on the first pressure receiving portion 38 through the first annular groove 21 to cause the spool 33 to move. Is pushed rightward to the second position.

As a result, the second port 37 communicates with the tank port 35, so that the pressure oil in the second chamber 11 and the third chamber 12 flows out to the tank, and the piston 3 is pressed by the pressure in the first chamber 10. Move up.

The piston 3 reciprocates by repeating the above operation.

When the spool 41 of the switching valve 31 is pushed to the second position as shown in FIG. 3, the first port 44 and the second port 45 are shut off, and the second port 45 is connected to the tank port 43.
Therefore, the third chamber 12 communicates with the tank, and the pressure oil is supplied only to the second chamber 11.

As a result, the reciprocating speed of the piston 3 is increased, so that the vibration generator is suitable for use as a breaker.

As described above, when the breaker operation is performed and the idle hit state is established, the piston 3 descends below the predetermined stroke, and the first annular groove 21 and the second annular groove 22 communicate with each other through the first slit 24. The second annular groove 22 communicates with the tank port 35 from the first port 36 of the main switching valve 30. The opening area of the drilled hole 20 and the first chamber 10 is reduced, and the aperture becomes an aperture.

As a result, the second pressure receiving portion 3 of the main switching valve 30
Since the pump pressure acts on 9 and the first pressure receiving portion 38 becomes the tank pressure, the main switching valve 30 is held at the second position, so that the piston 3 stops the reciprocating operation.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a vibration generator.

FIG. 2 is an enlarged sectional view of a piston operating portion and a switching valve.

FIG. 3 is a cross-sectional view showing a state where a spool of a switching valve is switched.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vibrating part main body 2 ... Cylinder hole 3 ... Piston 10 ... 1st chamber 11 ... 2nd chamber 12 ... 3rd chamber 31 ... Switching valve 41 ... Spool 46 ... Holding mechanism

Claims (1)

[Claims] A first chamber having a small pressure receiving area, a second chamber having a large pressure receiving area, and a third chamber having a large pressure receiving area are formed by inserting a piston into a cylinder hole of a vibration section main body. 1
0 and always supply pressure oil to the second chamber 11 and the third chamber 12 in accordance with the stroke of the piston 3 so as to reciprocate the piston 3. 1, a switching valve 31 is provided for switching the third chamber 12 between a first position communicating with the hydraulic pressure source and a second position communicating with the tank, and the spool 41 of the switching valve 31 is orthogonal to the reciprocating direction of the piston 3. In the direction between the first position and the second position.
A vibration generator, comprising a holding mechanism 46 for holding the vibration generator at a second position.