JPS5830966Y2 - Logic valve high speed actuation device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a high-speed operating device for a logic valve.

Conventionally, as shown in FIG. 2, a logic valve ati having a cartridge-type seat-type valve structure has its primary side and secondary side C communicating with a pressure chamber e behind a valve body d of the valve a. It is generally controlled by supplying and discharging pressure 1, and the supply and discharge is generally performed by switching the electromagnetic switching valve f, but the closing speed of the valve a is limited by the diameter of the orifice h interposed in the pilot circuit g. If the diameter of the orifice h is increased, the closing speed of the valve a can be increased, but on the other hand, since the flow rate flowing into the pilot circuit i from the orifice h is increased, the flow rate that can be discharged from the pressure chamber e is reduced, and the valve opening speed is slowed. There is a certain inconvenience.

Conversely, if the diameter of orifice h is narrowed, logic valve a will have a slower closing speed and faster opening speed;
It has the disadvantage that it cannot be opened and closed quickly.

The purpose of the present invention is to eliminate such inconveniences, and an embodiment thereof will be described with reference to FIG. 1.
is a hydraulic circuit, 2 is a logic valve interposed therein, 3 is a valve element of the logic valve 2, and the valve element 3 is the pressure i in the pressure chamber 4 behind it. fylj moves to control communication between the primary side 1a and the secondary side 1b of the hydraulic circuit 1.

Reference numeral 5 designates a first pilot circuit that connects the pressure chamber 4 to the secondary side 1b, and the circuit 5 is equipped with a check valve equipped with a check valve that allows fluid to flow into the pressure chamber 4. The valve 6 and the logic valve 2 have almost the same structure and a small first sub-port: logic valve I.
and is provided.

The flow rate regulating valve 6 with a check valve performs an adjustment function when stagnation occurs due to the opening speed of the logic valve 2 being too fast. It also acts to speed up pressure transmission to the pressure chamber 4 when the logic valve 2 is held closed.

A first electromagnetic switching valve 10 is further connected to the pressure chamber 7a of the first sub-logic valve 7, and when the throttle valve 10 is in the position 10a, the pressure on the primary side 1a of the hydraulic circuit 1 flows through the check valve 8. The pressure chamber 7a is
When the pressure chamber 7a is in the position 10b, the pressure in the pressure chamber 7a is discharged to the tank 11.

13 (ri Check valve 8 of second pilot circuit 9 and first
A connection circuit is shown that connects the electromagnetic switching valve 10 between the check valve equipped flow rate adjustment valve 6 of the first pilot circuit 5 and the first sub-logic valve 7. A relatively narrow diameter aperture 12 of studdedness is provided.

Furthermore, the pressure chamber 4 of the logic valve 2 and the flow rate adjustment valve 6 with a check valve
The first pilot circuit 5 between them is branched to form the hydraulic circuit 1.
A third pilot circuit 14 connected to the primary side 1a of the throttle valve 15 is provided, and a second sub-logic valve 15, which is small and has almost the same structure as the logic valve 2, is interposed therein.
are connected to the third pilot circuits 14 before and after the throttle valve 15 via the shuttle valve 16 through connection passages 17 and 18, and the pressure chamber 15a is switched to the tank 11 through the connection passage 17 directly connected to the primary side 1a. A second electromagnetic switching valve 19 for connection is provided.

The shuttle valve 16 is in the second state when the second electromagnetic switching valve 19 is ON.
The sub logic valve 15 has a function as a check valve, and when the solenoid switching valve 19 is OFF, the logic valve 1
The higher pressure of the connection passages 17 and 18 acts on the pressure chamber 15a of No. 5 to keep the throttle valve 15 closed, and the switching valve 19 is closed.
When N, the pressure chamber 15a becomes the same pressure as the connection path 18 due to the operation of the shuttle valve 16, and the logic valve 15 has a one-way flow, that is, from the primary side 1a through the third pilot circuit 14 to the first pilot circuit. It operates as a check valve allowing flow to 5.

By providing the logic valve 15 with a check valve function, it is possible to quickly close the valve when the electromagnetic switching valve 19 is turned off.

Reference numeral 20 denotes a stroke limiter that limits the operating distance of the valve body of the first sub-logic valve 7, which is the first stroke limiter that is necessary to ensure the closing force of the logic valve 2, that is, the pressure difference between the primary side 1a and the secondary side 2b. The opening area of the auxiliary logic valve 7 is set, and the throttle valve 7 is restricted from opening more than necessary in order to speed up the closing time of the throttle valve 7.

To explain its operation, first, the first solenoid switching valve 10 is energized and switched to position 10b, and the first sub-logic valve T
The pressure chamber 7a is connected to the tank 11, and its valve body is pushed by the pressure of the first pilot circuit 5 equal to the pressure of the pressure chamber 4 of the logic valve 2, that is, the pressure of the head side chamber B and the pressure of the primary side 1a. and open the valve.

When the valve is opened, the fluid in the pressure chamber 4 flows out to the secondary side 1b of the hydraulic circuit 1 while being controlled by the flow rate adjustment valve 6 with a check valve of the first pilot circuit 5, and the fluid in the pressure chamber 4 flows out to the secondary side 1b of the hydraulic circuit 1. The opening speed of the flow rate regulating valve 6 is controlled, but if the flow rate regulating valve 6 is opened wide, it can be opened relatively quickly.

This valve opening amount is determined by the flow rate flowing through the hydraulic circuit 1 and the first pilot circuit 5.

Simultaneously with the opening of the first sub-logic valve 7, pressure is applied from the primary side 1a of the hydraulic circuit 1 to the check valve 8 of the second pilot circuit 9 and the throttle 12 of the connection circuit 13 to close the valve body 3 of the logic valve 2. However, since the first sub-logic valve 7 is open, the valve body 3 does not close.

Next, if the first electromagnetic switching valve 10 is switched to position 10a,
1. First, the pressure on the primary side 1a of the hydraulic circuit 1 acts on the pressure chamber 7a of the first auxiliary logic valve 7 to close it via the second pilot circuit 9, and then the pressure on the primary side 1a It enters the pressure chamber 4 of the logic valve 2 from the second pilot circuit 9 via the throttle 12 of the connection circuit 13 and the flow rate adjustment valve with check valve 6 of the first pilot circuit 5.

The orifice 12 of the connection circuit 13 is relatively narrow, and therefore, the valve body 3 of the logic valve 2 cannot be closed rapidly with the -11, but in order to increase the valve closing speed, the first electromagnetic switching valve 10 is Simultaneously with the excitation, the second electromagnetic switching valve 19 is excited to connect the pressure chamber 15a of the second sub-logic valve 15 to the tank 11, and thus the pressure of the second sub-logic valve 15 is equal to the pressure on the primary side 1a. The valve opens due to the pressure of the third pilot circuit 14,
The pressure on the primary side 1a of the hydraulic circuit 1 directly enters the pressure chamber 4 of the logic valve 2 and rapidly closes the throttle valve 2.

In this manner, the device of the present invention includes a first sub-logic valve 7 whose opening and closing of the logic valve 2 is controlled by the first electromagnetic switching valve 10;
The throttle valve 2 is opened relatively quickly by adjusting the opening of the flow rate regulating valve 6 with a check valve, and the throttle valve 2 can be closed relatively quickly. is a rapid valve closing by closing the first sub-logic valve 7 and opening the second sub-logic valve 15, and the first width logic valve 7.
The valve can be closed relatively slowly by only closing the valve.
It has the advantage of being able to eliminate the disadvantages of limitations due to the diameter of the orifice as in the prior art described above.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an embodiment of the device of the present invention, and FIG. 2 is a diagram of a conventional example. 1...Hydraulic circuit, 1a...Primary side, 1
b...Secondary side, 2...Logic valve, 3
... Valve body, 4 ... Pressure chamber, 5 ...
...First pilot circuit, 6...Flow rate adjustment valve with check valve, 7...First sub-logic valve, 7a...
...Pressure chamber, 8...Check valve, 9...
...Second pilot circuit, 10...First electromagnetic switching valve, 10a. 10b-0,...position, 11...tank, 1
2...Aperture, 13...Connection circuit, 14
...Third pilot circuit, 15...Second sub logic valve, 15a...Pressure chamber, 16...
...Shuttle valve, 17,18... Connection path,
19...Second electromagnetic switching valve.

Claims (1)

[Scope of utility model registration request] A logic valve 2 is interposed in the hydraulic circuit 1, and the valve body 3 of the logic valve 2 is operated by controlling the pressure in the pressure chamber 4 behind the logic valve 2, thereby controlling the primary side 1a and the secondary side ib of the hydraulic circuit 1. In the type that communicates with the pressure chamber 4, a first pilot circuit 5 connecting the pressure chamber 4 and the secondary side 1b is provided, and this has a flow rate with a check valve that allows free flow to the pressure chamber 4. A check valve 8 is provided to check the pressure on the primary side 1a to the pressure chamber 7a of the first auxiliary logic valve 7 through the adjustment valve 6 and the first auxiliary logic valve 7.
: a position 10a for introducing via the second pilot circuit 9 and a position connecting the pressure chamber 7a to the tank 11;
110. b, and the second pilot circuit 9 between the check valve 8 and the first electromagnetic switching valve 10 is connected to the first sub-electromagnetic switching valve 10 through a connecting circuit 13 having a throttle 12. The first one between the logic valve 7 and the flow regulating valve 6 with check valve.
A third pilot circuit that is connected to the pilot circuit 5 and further connects the first pilot circuit 5 between the check valve equipped flow rate adjustment valve 6 and the pressure chamber 4 of the logic valve 2 to the primary side 1a. 14 is provided, and a second sub-logic valve 15 is interposed therebetween, and a pressure chamber 15a of the valve 15 is connected to a third pilot circuit 14 before and after the valve 15 through a connecting path 17.
．． Connecting path 17 connected by 18 and connected to 1 winter side 1a
A high-speed operating device for a logic valve, which is provided with a second electromagnetic switching valve 19 for switchingly connecting the pressure chamber 15a to the tank 11.