JP2586737Y2 - Solenoid switching valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot type electromagnetic switching valve used for switching a flow path.

[0002]

2. Description of the Related Art Conventionally, a pilot-type electromagnetic switching valve is often used to control a pneumatic cylinder or a hydraulic cylinder.

In this type of electromagnetic switching valve, a spool valve body, a pilot chamber provided at both ends of the spool valve body having different pressure receiving areas, two solenoids, a plunger moved by energizing each solenoid, and a plunger of each plunger. It is configured to include a pilot valve element that is switched by movement, a pilot flow path for supplying pressurized fluid from a supply port to each pilot chamber by switching each pilot valve element, and the like.

According to this electromagnetic switching valve, the pressurized fluid is supplied to one of the pilot chambers by selectively energizing the two solenoids, whereby the spool valve body moves to one of the stroke ends. Then, the main flow path is switched.

[0005]

However, according to the above-described conventional electromagnetic switching valve, one of the solenoids must be energized to switch the spool valve. That is, after one solenoid is energized to move the spool valve body to switch the flow path, in order to switch the flow path in the opposite direction, it is necessary to energize the other solenoid, and one of the solenoids must be energized. It was not possible to switch the spool valve element by turning on / off the energization of only the solenoid.

[0006] Therefore, the degree of freedom in using the electromagnetic switching valve is required, for example, it is necessary to perform wiring for the two solenoids, and it is necessary to control to selectively energize the two solenoids. It was low.

In view of the above-mentioned problem, the present invention makes it possible to easily switch the operation of the spool valve between a detent operation by two solenoids and a return operation by one solenoid, and to use the electromagnetic valve with a high degree of freedom in use. It is an object to provide a switching valve.

[0008]

According to a first aspect of the present invention, there is provided an electromagnetic switching valve, comprising: a spool valve body; and a pilot chamber provided at both ends of the spool valve body and having different pressure receiving areas. , Two solenoids, a plunger that is moved by energizing each of the solenoids, a pilot valve element that is switched by the movement of each of the plungers, and pressurized fluid from a supply port by switching each of the pilot valve elements. A pilot flow path for supplying to the pilot chamber, and an electromagnetic switching valve having the pilot chamber and the pilot valve element in the middle of the pilot flow path communicating with the pilot chamber having a smaller pressure receiving area; Alternatively, a manual operation valve for selectively connecting the pilot chamber and the supply port is provided.

In the electromagnetic switching valve according to the present invention, a manual operating member for forcibly switching the pilot valve body is provided so that the pilot chamber having a smaller pressure receiving area communicates with the supply port. It is composed.

[0010]

When the manually operated valve is switched, the pilot chamber and the pilot valve body or the pilot chamber and the supply port are selectively connected. When the pilot chamber and the pilot valve element are connected, the spool valve element is switched according to energization or non-energization of the two solenoids.

When the pilot chamber and the supply port are connected, the pilot chamber having the smaller pressure receiving area is always supplied with the pressurized fluid from the supply port and the pilot chamber having the larger pressure receiving area due to energization or non-energization of one solenoid. The supply or non-supply of the pressurized fluid to the pilot chamber causes the spool valve to move and switch in either direction.

By operating the manual operation member, the pilot valve element is forcibly switched so that the pilot chamber having the smaller pressure receiving area communicates with the supply port.

[0013]

1 is a sectional view of an electromagnetic switching valve 1 according to the present invention. The electromagnetic switching valve 1 includes a main valve 11 and a pilot valve 1
It consists of two. The main valve 11 is a main valve block 21
And end covers 22, 23 attached to both sides thereof
A spool valve element 24 and a pilot driving piston 25 are slidably inserted therein.

The main valve block 21 has a supply port P for supplying compressed air, output ports A and B for switching and outputting pressurized fluid, and an exhaust port R for exhaust.
1 and R2 are provided. Spool valve element 24
Moves to one of the stroke ends, the compressed air supplied from the supply port P is output from one of the output ports A and B, and the exhaust air from one of the output ports B and A Exhaust port R
1, R2.

A pilot chamber 31 having a large pressure receiving area is provided outside the piston 25, and a pilot chamber 32 having a small pressure receiving area is provided at the other end surface of the spool valve element 24. These pilot chambers 31 and 32 communicate with the pilot valve 12 through the communication holes 37 or the communication holes 36 and 35.

A manually operated valve 2 is provided on the pilot chamber 32 side.
6 are provided. When the head 26a protrudes from the end cover 23 as shown in FIG. 1, the manually operated valve 26 connects the communication hole 36 and the communication hole 35 and pushes the head 26a into the end cover 23. , Communication hole 3
6 and the communication hole 35 are shut off, and the communication hole 36 and the supply port P are communicated through the communication holes 33 and 34. Therefore, by operating the manually operated valve 26, the pilot chamber 32 is selectively switched to the communication hole 35 or the supply port P.

The pilot valve 12 includes solenoids 51 and 5
2. Plungers 53 and 54 which are moved by energizing the solenoids 51 and 52, and pilot valve bodies 57 and 58 which are switched via the pins 55 and 56 by the movement of the plungers 53 and 54, respectively.

When the solenoids 51, 52 are in a non-energized state, the plungers 53, 54 are compressed springs 59, 60.
Of the compression spring 6 via the pins 55 and 56.
The pilot valve bodies 57 and 58 are pushed against the piston valves 1 and 62. In addition, the plungers 53 and 54 themselves press against the valve seats, thereby blocking the communication between the chamber 77 and the communication hole 79 and the communication between the chamber 78 and the communication hole 80. In this state, the pilot valve chambers 73 and 74 communicate with the outside air through the communication holes 81 and 82.

When one of the solenoids 51, 52 is energized, the plungers 53,
54 moves rightward in FIG. 1, and pilot valve bodies 57, 58
Is pressed by the compression springs 61 and 62 to close the valve seat.
In this state, the compressed air from the supply port P flows through the communication holes 38 and 83, the communication holes 79 and 80, the chambers 77 and 78, and the holes 7
5, 76, etc., to any of the pilot valve chambers 73,
It communicates with 74. Since the pilot valve chambers 73 and 74 communicate with the communication hole 37 or the communication hole 35 via the communication holes 71 and 72, compressed air is supplied to one of the pilot chambers 31 and 32.

Therefore, when the manually operated valve 26 is not operated (the state shown in FIG. 1), one of the solenoids 51,
By supplying electricity to 52, compressed air is supplied to one of the pilot chambers 31 and 32, and the spool valve element 24 moves to one of the stroke ends to switch the flow path. That is, by alternately energizing the two solenoids 51 and 52, the spool valve element 24 alternately reciprocates to perform a detent operation in which the flow path is switched.

When the head 26a is pushed into the end cover 23 by operating the manually operated valve 26, regardless of whether the solenoid 52 is energized or deenergized, the pilot chamber 32 is turned on.
Is supplied with compressed air from a supply port P. In this state, when the compressed air is not supplied to the pilot chamber 31, the spool valve 2
1 is moved upward in FIG. 1, but when the solenoid 51 is energized and compressed air is supplied to the pilot chamber 31, the spool valve body 24 moves downward in FIG. 1 because the pressure receiving area of the pilot chamber 31 is large. It is pushed and moved, and the flow path is switched. When the solenoid 51 is de-energized and the compressed air in the pilot chamber 31 is discharged to the outside air, the compressed air in the pilot chamber 32 causes the spool valve element 24 to return upward in FIG. As described above, the spool valve element 24 performs the return operation by one solenoid 51.

According to the above-described embodiment, the operation of the spool valve element 24 can be easily switched between the detent operation by the two solenoids 51 and 52 and the return operation by the one solenoid 51 by operating the manually operated valve 26. Therefore, the degree of freedom in using the electromagnetic switching valve 1 is high.

FIG. 2 is a sectional view showing a part of an electromagnetic switching valve 1a according to another embodiment of the present invention. Electromagnetic switching valve 1a
Instead of the manual operation valve 26 of the electromagnetic switching valve 1 described above, a manual operation member 2 for restricting the movement of the plunger 54 and preventing the return movement by the compression spring 60 is performed.
7 are provided. Other structures are the same as the above-described electromagnetic switching valve 1.

The manual operation member 27 is provided with the manual operation valve 2 described above.
As in the case of 6, it is provided to be able to perform an operation of pushing from outside, and when the operation is not being performed, that is, when it is not pushed, it does not affect the operation of the plunger 54 at all. , The plunger 54 is maintained in the same state as when the plunger 54 is sucked by the solenoid 52, as shown in FIG. 2, and the compressed air from the supply port P is always supplied to the pilot chamber 32. .

That is, similarly to the manually operated valve 26 of FIG. 1, the spool valve body 24 is operated by the manually operated member 27 of FIG.
Can be easily switched between the detent operation and the return operation.

In the above embodiment, the electromagnetic switching valves 1 and
The structure, configuration, shape, material, and the like of 1a can be variously changed in addition to those described above in accordance with the gist of the present invention.

[0027]

According to the present invention, the operation of the spool valve element can be easily switched between the detent operation by two solenoids and the return operation by one solenoid to enable use, and the degree of freedom in use is high. It has the effect of becoming.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electromagnetic switching valve according to the present invention.

FIG. 2 is a sectional view showing a part of an electromagnetic switching valve according to another embodiment of the present invention.

[Explanation of symbols]

1, 1a Solenoid switching valve 24 Spool valve body 26 Manually operated valve 27 Manual operation member 31 Pilot chamber 32 Pilot chamber (Pilot chamber with smaller pressure receiving area) 51, 52 Solenoid 53, 54 Plunger 57, 58 Pilot valve body 37, 71 Communication hole (pilot flow path) 35, 72 Communication hole (pilot flow path) P Supply port

Claims (2)

(57) [Scope of request for utility model registration] 1. A spool valve body, pilot chambers provided at both ends of the spool valve body and having different pressure receiving areas,
Two solenoids, a plunger that is moved by energizing each of the solenoids, a pilot valve body that is switched by the movement of each of the plungers, and a pressurized fluid from a supply port by switching each of the pilot valve bodies to each of the pilot chambers. A pilot flow path for supply;
An electromagnetic switching valve comprising: a pilot valve that selectively communicates with the pilot chamber and the pilot valve body or the pilot chamber and the supply port in the middle of the pilot flow path that communicates with the pilot chamber having the smaller pressure receiving area. An electromagnetic switching valve provided with a manually operated valve for connection. 2. A spool valve body, pilot chambers provided at both ends of the spool valve body and having different pressure receiving areas,
Two solenoids, a plunger that is moved by energizing each of the solenoids, a pilot valve body that is switched by the movement of each of the plungers, and a pressurized fluid from a supply port by switching each of the pilot valve bodies to each of the pilot chambers. A pilot flow path for supply;
An electromagnetic switching valve having a manual operation member for forcibly switching the pilot valve body so that the pilot chamber having a smaller pressure receiving area communicates with the supply port. Characteristic electromagnetic switching valve.