JPS6272971A - Interlock selector valve - Google Patents

Abstract

PURPOSE:To enable a selector valve to be interlocked under hydraulic control, by providing such an arrangement that working pressure is applied to a selector valve when a first valve is actuated while a second valve is not actuated. CONSTITUTION:There is provided a first pilot valve Va which actuates in association with the pilot pressure in a pilot line. Further, there is provided a second pilot valve Vb which actuates in association with the working pressure discharged from a shuttle valve Vc which in turns actuates in association with working pressure discharged from either one of change-over valves in other two devices. Further, there is provided a selector valve V for driving an actuator. Working pressure is applied to the selector valve V when the first valve Va actuates while the second valve Vb does not actuate. With this arrangement, it is possible to interlock the valve under hydraulic control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interlock directional control valve that operates with an interlock function when controlling pressures such as hydraulic pressure and pneumatic pressure.

[Conventional technology]

Generally, solenoid valves are used in conventional directional control valves that have an interlock function. [A method for controlling the excitation circuit of a solenoid valve that detects a stroke of 1 with a limit 1 switch and switches the direction of driving the relaxation actuator using the electric signal from the detected limit 1 switch. etc.

[Problem that the invention seeks to solve]

However, although some of the conventional circuits and valves that perform the interlock function are electrically controlled, such as electromagnetic valves, there are no interlock functions that are controlled by hydraulic pressure.

There is a limit switch that is somewhat similar to the interlock function, but it detects the end of each sequence valve operation and starts the next operation. The sequence is 1.11n, and in order to prevent danger or abnormal operation, it is necessary to prevent a certain operation from causing another operation that would cause an abnormality. ] This is different from the interlock function.

The present invention was created in view of the above problems, and the present invention has been made in view of the above-mentioned problems.
Dress'? At JL, the J:reintake 1:1 is set for hydraulic pressure control (the interlock directional control valve at 14f is set at the same time as I).

(Means for Solving the Problems) The present invention provides a means for controlling the switching valves of the two devices, such as the first pilot l-p which moves in accordance with the pilot pressure of the pyrower 1 to the line. The valve is operated according to the discharge operating pressure, and the valve is operated according to the discharge operating pressure.
A second pilot valve and a directional control valve for driving the actuator are made according to the operating conditions, and when the first pilot valve operates and the second pilot valve does not move, the operating pressure is changed to the above. In addition to the directional switching valve, the directional switching valve, the first and second bi-directional valves, and the shuttle valve are provided in series.

[Effect]

Therefore, the combination of the predetermined pilot pressure set in the pilot line and the operating pressure sets a prohibition condition for the directional control valve, and the directional control valve can be operated. : It is possible to become successful.

(Example) A practical example of the present invention will be explained in detail based on the drawings of FIGS. 1 to 3.

FIG. 1 is a cross-sectional view of an interlock directional switching valve showing an embodiment of the present invention, which is composed of a directional switching valve (2), two symmetrical pilot valves V, Vb, and a shuttle valve VC.

The directional control valve V has a rod 10 that slides inside the casing, and a spring is applied to one end of the rod 10 by an actuating force j applied from a P boat 1 through a C boat of a pilot valve vb, which will be described later. 11. A piston 12 that moves 1 time against the immediate force of 11 is provided f1. Also rod 1
A near the center of 0 as the piston 12 slides. P, which is connected to the A boat of pilot #V a, which will be described later. With a boat.

Or △. T connected to Ta bow 1 of pilot valve Va. Spool 13 that opens and closes to the boat
is set up, and the operation that is added to the Po boat is "transferring".

Note that when the operating pressure applied from [) is OK, /'C is in the initial state of 1, the spring 11 causes the piston 1 to
2 [Well, in the left direction in Figure 1 (= 1 '3'!
l＼ Point and the king. A boat is passing through 1jf1.

The pilot valves V, Vb each have a stepped rod I+, 15 that moves in the casing, and one end of the stepped rod 14 behind the step f'' rod is connected to the four pipes 1 to 15 added from the P8 boat. On the other side of the pressure, a piston 18 is attached which slides against the elastic force of the spring 16 by a predetermined biloft pressure. In addition, near the center of the stage (= J O Rad 14, as the screws 1 to 18 slide, the A boat and the Bb ball 1 connected to the pilot valve Vb BI, bow [-] are opened and closed. A spool 20 is provided to switch the operating pressure.At one end of the above stage (=J rod 15,
After) Sea/Torle valve P. A piston 19 is provided which slides against the elastic force of the spring 17 due to the operating pressure applied from the Pb boat via the boat. Further, a spool 21 is sunk near the center of the stepped rod 15, which opens the gate between the Bb boat and the C boat connected to the P boat of the directional control valve V as the screws 1 to 19 slide. The operating pressure is switched.

When the pilot pressure applied to the Pa boat and the operating pressure applied to the Pb boat are both in the initial state of OK'l/cm, the spring 16 causes the piston 18 to move rightward in FIG. 1, and the spring 17 causes the piston 19 to move to the first position.
It is biased toward the left in the figure, and boats A and B are closed, allowing boats Bb and C to pass.

Shuttle valve ■. has a rod-equipped valve body 22 in the casing,
23 is on the right, and the valve body 22 and 23 with the opening and the socket are provided symmetrically on the left and right, and are Pcl or P. The inside of the casing is moved against the elastic force of springs 24 and 25 by the output operating pressure from the switching valve of another device (not shown) applied from the second boat.
The snow moves.

Furthermore, P and P. Both operating pressures applied to 2 ports are O.
At the initial state of K'j/ci, the spring 24
．． 25, the valve bodies 22 and 23 with rods are connected to the valve seats 26 and 27.
The Po boats are closed due to pressure from the government. In addition, either one of the valve bodies 22 and 23 operates to open the Po boat in response to the pressure i11+ applied from the C1 or Pc2 boat, for example, the Pc2 boat. When the working pressure is applied from boat 1, only the valve body 22 with Jrad operates, the working pressure from boat Pc1 is applied to the boat Pb via the PC boat, and the valve body 23 with rod is pressed against the valve seat 27. state. Also, when the working pressure is applied from the P boat, only the rod-equipped valve body 23 operates, and the working pressure from the C2 boat is applied to the Pb boat via the P boat, and the rod-equipped valve body 22 is moved to the valve seat 23. It becomes a state of being pressed against.

Therefore, for example, the pilot valve Va has a pilot pressure of 100
When boat A and boat Ba are passed between 9/ct' and 120Kg/art, the pilot pressure is 10
(In case of 1g/i or less, screw 1-18 is spring 1.
6 to the right in the figure, the A boat is closed and the B boat and the Ta boat are separated. When the pilot pressure is 120 Kff/cm or more, the piston 18 compresses the spring 16 and moves to the left in the figure, and the spool 20 also moves to the left as the screws 1 to 1ε3 move. Then, the spool 20 passes the point where boats A and B8 are opened and moves to the left end. Therefore, △ boat will be closed and B boat and T8 boat will be open.

Next, the pilot pressure is 100Kg/cm ~ 12OK'l/
During ctA, the piston 18 compresses the spring 16 and moves to the left in the figure, and the spool 20 also moves to the left as described above. Then spool 20 is △boat and B
When moving to the point where the boat is opened, the elastic force of the spring 16 and the pressure will become equal, and the spool 20
stops. Therefore, the A port and the 8-boat are located between them, the Ta boat 1- is closed, and the operating pressure from the Po boat pressurizes the piston 12 of the directional control valve V from the P boat via the pilot valves Va and V. Due to this pressurization, the screw 1
Since the piston 12 compresses the spring 11 and moves to the right in the figure, the spool 13 also moves to the right as the piston 12 moves. Therefore l). The boat and Δ boat are connected, the To boat is closed, and the operating pressure from P boat 1 is △. It can be discharged from the boat.

Also, shuttle valve ■ P or [). 2 bow to 1 C
When the working pressure is applied to C1, the valve body with the rad is activated and the working pressure is applied from the 1po boat to the Pb boat. Therefore, the piston 19 of the pilot valve Vb compresses the spring 17 and moves to the right in the figure, so that the spool 21 also moves to the right as one piston moves. Therefore, Bb port is closed and P
The operating pressure from the o-boat will be cut off. As a result, the piston 12 of the directional control valve (2) moves to the left in the figure due to the elastic force of the spring 11, and moves to the left in the figure as the spool 13 moves. Bow-1-
is open, P Boat is closed and P. The boat's operating pressure is cut off. Therefore A. The operating pressure of boat 1~ can flow out of the To boat.

FIG. 2 is an example of a circuit diagram for driving the actuator Δ1 using the interlock directional switching valve shown in FIG.

First, adjust the pilot pressure by using a regulating valve (not shown).
From 00Kg/Cm to 120! ? /CM, the pilot valve Va is opened and 416 degrees.At this time, the operating pressure for driving other actuators is applied to one of the valves 71-1 of the seal valve Vc via another directional control valve (not shown). -, the pilot valve Vb becomes closed and the operating pressure P
. is disconnected due to this interlock function. As a result, the directional control valve V cannot operate, and the actuator 1
- No operating pressure is applied to the ta. Therefore, actuator Δ1 is no longer able to drive.

In addition, when the operating pressure to avoid driving other actuators is not applied to either boat of the shuttle valve V, the pilot valve b is open and the operating pressure P is applied to the directional control valve a and the switching valve V via the pilot valves V and Vb. reach. As a result, the directional control valve V operates, and the first
P shown in the figure. Boat and A. Because I'm letting the boat pass,
Working pressure P. is the actuator △1 via the directional control valve■
join. Therefore, actuator Δ1 can be driven. Further, the operating pressure Po applied to the actuator A1 via the direction switch 57■ is also applied to the other pilot valves, interlocking the other seven actuators and creating a prohibition condition for not driving the actuator A1 at the same time.

FIG. 3 is a sectional view of an interlock directional switching valve showing another embodiment of the present invention, which is composed of a directional switching valve 57V, two pilot valves V, Vb, and three shuttle valves V to V8. ing.

Therefore, the pilot valve ■b is a shaft valve ■. When operating pressure is applied to any one of the boats P to P6, the boat closes and the directional control valve V can be placed in an interlock state.

Note that the present invention is not limited to the above-described embodiments, but it is also possible to add more drive prohibition conditions to one actuator by arranging a plurality of shuttle valves that serve as the actuator drive prohibition condition f[. It is also possible to design a circuit that incorporates drive circuits for more actuators by bringing the operating pressure ranges of multiple actuators closer together, and by combining pilot pressure settings and interlock functions to prevent multiple actuators from operating at the same time. This makes it possible to select and avoid driving a specific actuator.

Furthermore, the present invention can be applied to control of air pressure.

(Effects of the Invention) As explained above, the present invention provides a first pilot valve that operates in response to pyro sweat in a pilot line;
A shuttle valve that operates in response to the discharge operating pressure from one of the switching valves of the two other devices, a second pylon 1 to valve that operates in accordance with the discharge operating pressure from the shuttle valve, and an actuator are driven. a directional valve, the directional valve and first and second pilots configured to apply operating pressure to the directional valve when the first pilot valve is activated and the second pilot valve is not activated; Since the valve and the shuttle valve are connected, the valve can be interlocked by hydraulic pressure control. Furthermore, since the directional switching valve can be operated by setting a condition for prohibiting its operation, malfunctions can be prevented and safety and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 shows an interlock direction 1 showing an embodiment of the present invention.
, 7J switching valve; FIG. 2 is an example of a circuit diagram using the interlocking directional switching valve of FIG. 1; FIG. 3 is a sectional view of the interlocking directional switching valve showing another embodiment. 10...Rod, 11.16.17,24.25...Spring, 12
．． 18.19... Piston, 13.20.21... Spool, 14.15... Stage (= J rod, 22.23... Valve body with rod, ■... Directional switching valve, V , Vb... Pilot 1-valve, ■ o... Shuttle valve.

Claims (1)

[Claims] A first pilot valve that operates in response to pilot pressure in a pilot line; a shuttle valve that operates in response to discharge operating pressure from either of the switching valves of two other devices; and the shuttle. A second pilot valve that operates according to the discharge operating pressure from the valve, and a directional control valve that drives an actuator, and when the first pilot valve is operated and the second pilot valve is not operated, the operating pressure is An interlock directional switching valve characterized in that the directional switching valve, the first and second pilot valves, and the shuttle valve are arranged in series so that the directional switching valve is added to the directional switching valve.