JPS6245397Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a hydraulic operating device such as a shatter cutter, in particular, a hydraulic control device equipped with an operation cylinder that opens and closes a switch such as a shredder cutter, and a control valve that switches and controls the piston. Regarding equipment.

In conventional devices of this kind, air is trapped inside the device during manufacturing and assembly or during subsequent operation. Operation oil is applied and the pressure to operate the slider becomes weaker. Therefore, the space on the end face side of the slider, where the operating oil is supplied, is communicated with the outside of the hydraulic operating device through an air vent pipe at the initial stage, thereby removing the air contained in the operating oil and operating the slider. The speed of operation of the control valve was previously achieved. However, when the hydraulic operating device is switched to the return position, on the other hand, the operating oil flowing back through the air vent line acts to prevent the return operation of the slider, thereby delaying the return operation.

In view of these conventional problems, it is an object of the present invention to provide a hydraulic operating device for a shear, disconnector, etc., which allows quick return operation.

An embodiment of this invention will be described below with reference to the drawings. FIGS. 1A and 1B show the hydraulic operating device of this invention in the return position and operating position, respectively.

The device 10 has an operating cylinder 20 and a control valve 30 at its lower end. The operating cylinder 20 has a piston 24 in a case 22, which is used by a piston rod 26 to open and close a switch 100, such as a switch or disconnector. control valve 30
has a case 32 in which a slider 34 slides at right angles to the direction of movement of the piston 24. The slider 34 has a return head 36, an operating head 38, and a connecting rod 40 that interconnects them. A spring hole 36a is provided in the left end surface of the return head 36, into which a return spring 42 is inserted.Thus, in cooperation with the inner surface of the left end wall of the case 32, the return spring 42 always moves the slider 34 to the right return position. I'm trying to push it back. The return head 36 of the slider 34 has a tapered surface 36b on the connecting rod 40 side. On the other hand, the right operating head 38 has a sliding portion 38a.
It has a medium diameter portion 38b which has a diameter somewhat smaller than this and is integral with the inner diameter portion 38b in the axial direction. The connecting rod 40 side of this medium diameter portion 38b has a tapered surface 38c. Annular valve seats 32a, 32b are provided between the return head 36 and the operating head 38, and are engaged by respective tapered surfaces 36b, 38c. When the return head 36 and the operating head 38 are engaged with these valve seats 32a and 32b, a space 32c inside the case 32 in which the return head 36 and the operating head 38 are accommodated, respectively.
32d (first valve chamber 32d, second valve chamber 32c)
communication with the slider side space 22a of the piston 24 is cut off. In addition, 42 is the operating head 38
It is a seal ring fitted around the outer periphery of the

The accumulator 44 communicates with the switch side space 22b of the piston 24 in the operating cylinder 20 and the breaker via a conduit 46, and further communicates with the switching side space 22b of the breaker in the operating cylinder 20.
The accommodation space 3 for the return head 36 is connected to the storage space 3 via the side passage 48 inside.
It communicates with 2c. On the other hand, a space 32d inside the slider case 32 in which the middle diameter portion 38b of the operating head 38 is housed reaches the drain oil receiver 52 via the discharge pipe 50, and a switching control command is provided at the right end of the operating head 38. A hydraulic pressure switching command is given from the device 54 via a conduit 56. A space 32e between the right end of the operating head 38 and the inner surface of the right end wall of the case 32 communicates with the slider side space 22a of the piston 24 via an air vent line 58. Note that 58a is a throttle provided in the air vent pipe 58.

Next, the operation of this device will be explained. However, for the purpose of explaining the prior art, the air vent pipe 58 is not provided with a check valve 60, which will be described in detail later, and the air vent pipe 58 is not provided with a check valve 60, which will be described in detail later.
8, it is assumed that there is no obstruction to the flow of operating oil, etc. in both axial directions. It is now assumed that the operation cylinder 20 is switched from the return position of the control valve 30 shown in FIG. 1A to the operating position shown in FIG. 1B. When an activation command is issued from the switching control command device 54, the pipe 56 and the space 32 on the switching control command receiving side
High-pressure operating oil is applied to the right end surface of the operating head 38 of the slider 34 via e. However, it takes some time to reach a pressure value sufficient to move the slider 34 to the left against the return spring 42 in the return head 36. During this time, the air contained in the operating oil in the space 32e on the right end surface of the operating head 38 of the slider 34 is removed from the air vent pipe 58 and the piston 24.
The liquid is discharged to the outside through the slider side space 22a, the opening 32f of the case 32 in which the operating head 38 is housed, the space 32d, and the discharge pipe 50.

Thus, after a predetermined period of time has elapsed, the operating head 3
8 becomes sufficiently high, the slider 34 slides to the left, and the tapered surface 38c of the operating head 38 engages with the valve seat 32b, thus filling the slider side space. The communication state between 22a and space 32d is severed. Then, operating oil at a constant pressure enters the switch side space 22b of the operating cylinder 20 from the accumulator 44 via the pipe 46, and at the same time, the operating oil flows through the pipe 46,
48 enters the slider side space 22a of the piston 24 through the opening 32g of the slider case 32 in which the return head 36 of the slider 34 is accommodated. piston 24
The hydraulic oil pressure applied to the upper surface is applied only to the area of the piston 24 minus the cross-sectional area of the piston rod, while the hydraulic oil pressure applied to the lower surface of the piston 24 is approximately equal to the area of the piston 24. Therefore, the force from below the piston 24 prevails, causing the piston 24 to move upward, closing the switch 100 such as a breaker and the like, resulting in the state shown in FIG. 1B.

Conversely, let us consider the operation of the hydraulic operating device 10 from the state shown in FIG. 1B to the state shown in FIG. 1A. In this case, when a return command is issued from the switching control command device 54, the pressure of the operating oil in the pipe line 56 drops rapidly. Then, the slider 34 starts moving to the right in FIG. 1B. At the same time, operating oil enters the switch side space 22b in the operating cylinder 20 from the accumulator 44 via the pipe 46, while the operating oil in the slider side space 22a is discharged through the opening 32f of the slider case 32. External drain oil sump 52 via pipe 50
Expelled inward. As a result, the piston 26 descends, but at this time, some of the operating oil is released into the slider side space 2.
2a enters the space 32e on the right end surface side of the operating head 38 of the slider 34 via the air vent pipe 58, and exerts leftward pressure on the right end surface of the operating head 38. Therefore, the slider 34 moves slowly to the right.

In order to eliminate this movement delay, in this invention a self-resetting check valve 60 is provided in the air vent line 58. This check valve 60 prevents operating oil from flowing from the slider side space 22a to the space 32e through the air vent pipe 58, and vice versa.
from the slider side space 22 via the air vent pipe 58.
A generally known type that does not interfere with the operating oil flowing toward the direction a may be used. For example, as shown in the enlarged view of FIG. 2, a valve space 62 that extends in the axial direction and has a tapered surface 62a at the right end is provided in the middle of the air vent pipe 58, and a poppet 64 and a poppet 64 are provided in the valve space 62. The check valve 60 can be constructed by inserting a compression spring 66 that presses the right tapered surface 62a.

By providing this check valve 60, FIG.
The control valve 30 moves from the return position to the operating position shown in Figure 1B.
At the initial stage of switching, the poppet 64 enters the air vent line 58 from the space 32e and moves away from the tapered surface 62a of the valve space 62 to the left against the compression spring 66, and the slider side space 22a, the opening 32f, and the sliding Air passing through the space 32e inside the child case 32 and being discharged to the outside from the discharge pipe 50 is not obstructed in any way. Also, conversely, from FIG. 1B to FIG. 1A, the control valve 3
When 0 returns, the operating head 38 of the slider 34 is passed from the slider side space 22a through the air vent pipe 58.
The flow of operating oil toward the space 32e on the right end surface side is completely cut off by the check valve 60. As a result, the axial force applied to the slider 34 at the time of return becomes only the rightward force applied to the tapered surface 38c of the operating head 38 of the slider 34, and the slider 34 quickly returns to the right return position. can be switched to This allows piston 2
6, and therefore, the switch 100 is released quickly.

As is clear from the above, according to this invention, in the control valve, a check valve is provided in the air vent line to prevent the flow of fluid from the slider side space to the switching control command side space, so that the return operation is quick. It is possible to obtain high-performance hydraulic operating devices such as disconnectors and disconnectors.

[Brief explanation of the drawing]

FIG. 1A is a partial sectional view of an embodiment of the hydraulic operating device of this invention when it is in the return position, and FIG. 1B
is a partial sectional view of the same embodiment in the operating position;
FIG. 2 is an enlarged sectional view of the check valve used in the above embodiment. 10... Hydraulic operating device, 20... Operating cylinder, 30... Control valve, 34... Slider, 44...
Accumulator, 52...Discharge oil receiver, 54...Switching control command device, 60...Check valve, 100...Switch.

Claims (1)

[Scope of utility model registration request] A piston rod 2 is connected to the movable contact of the switch 100.
An operating piston 24 that engages with the piston rod 2 through the piston rod 2 is provided so as to be capable of reciprocating.
The inside of the operation cylinder 20 on the 6 side communicates with an accumulator 44, the first valve chamber 32d communicates with the operation cylinder 20, a switching control command unit 54 for switching the switch on/off command, and a discharge pipe 50, and a slider case 32 provided with a second valve chamber 33c communicates with a space 22a on the opposite piston rod side of the operation cylinder 20 and the accumulator 44.
and an actuating head 38 housed in the first valve chamber 32d of the slider case 32 and the actuating head 38
a control valve 30 including a slider 34 including a return head 36 which is integrally formed with the operating head 38 and is biased by a biasing force against the operation of the operating head 38; a space 22a of the operating cylinder 20 and the switching control command unit 54;
The air vent pipe 58 communicates between the operating head 3 and the oil supply from the switching command unit 54.
8 and the return head 36 are slid to the first valve chamber 3
2d and the space 22a of the operation cylinder are not communicated with each other and the discharge pipe 50 is closed, and the accumulator 44 and the space 22a of the operation cylinder 20 are communicated with each other to move the operation piston 24 in the contact closing direction, and the oil supply from the switching control command unit 54 is stopped to return the slider to its original position to communicate the space 22a of the operation cylinder 20 with the first valve chamber 32d and the second valve chamber 32c.
and the space 22a are not in communication with each other, and the operating piston 24 is moved in the contact opening direction. In this case, the first valve element 32d is connected to the air vent pipe 58 from the space 22a of the operating cylinder 20.
a check valve for preventing a flow of fluid toward the space on the switching control command receiving side, the check valve being provided in the space on the switching control command receiving side;