JPS6343628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a directional control valve, and more particularly to a directional control valve for supplying pressure to an actuator, such as a pneumatic cylinder, to perform mechanical movement such as a linear movement or an oscillating movement. directional control valve.

[Conventional technology]

Conventionally, this type of directional control valve has been constructed as shown in FIG. That is, the conventional directional control valve 1 has a housing 3 including a cylindrical body part 2 with both ends open, and a first housing 3 in the longitudinally intermediate part of the body part 2 so as to be perpendicular to the central axis. aisle 4
is formed. This first passage 4 forms a tube section which projects outwardly from the barrel section 2 for being connected in communication with a source of negative pressure.

By the way, a partition wall 5 is formed on the inner circumferential surface of the intermediate portion in the longitudinal direction of the body portion 2, and a through hole 6 having a diameter smaller than the inner circumferential diameter of the body portion is formed in the center of the partition wall portion 5. The first passage 4 opens into the inner peripheral surface of a through hole 6 formed in the partition wall 5. Further, in the body portion 2 of the housing 3, a first passage 4 is provided.
Two similar third passages 7 and fourth passages 8 are formed on opposite sides, and the openings in these body portions 2 are located on each side of the partition wall 5, as is clear from FIG. It is formed.

The housing 3 includes valve seats 9, 10 respectively attached to both open ends of the body part 2, in which a second passage 11a, 11b is formed, respectively. The second of these
One end of each of the passages 11a, 11b opens at the center of each valve seat 9, 10, and a distribution chamber 12a, defined by the partition wall 5 and each valve seat 9, 10, is opened at the center of each valve seat 9, 10.
12b, and the other end is connected to each valve seat 9, 10.
It is open on the outer circumferential surface of.

In each distribution chamber 12a, 12b, valve bodies 13a, 13b each having a U-shaped cross section are disposed so as to be movable in the axial direction of the housing 3.
13b includes valve seats 9, 10 and partition wall 5.
Rubber is baked and bonded to the part that touches the side wall of the As a result, the valve body 13a in the distribution chamber 12a
moves to the left as shown in Figure 2, and the valve seat 9
, the opening of the second passage 11a is closed and the first passage 4 and the third passage 7 are communicated with each other. When the valve body 13a moves rightward and comes into contact with the side wall of the partition wall 5, the through hole 6 is closed and the second
The passage 11a and the third passage 7 are communicated with each other. Similarly, when the valve body 13b in the distribution chamber 12b moves to the left and abuts against the side wall of the partition wall 5 as shown in FIG.
When moving to the right, it contacts the valve seat 10 and communicates with the second passage 11.
The opening of b is closed, and the first passage 4 and the fourth passage 8 are closed.
communicate with.

In order to interlock the movements of the two valve bodies 13a and 13b, a U-shaped interior, that is, a recess 14 is formed in the central part of the side surface of the valve body 13a, passing through the through hole 6.
An operating rod 15 is formed that extends to the operating rod 15.
A movable cylinder 16 that can slide on the operating rod 15 is fitted in the holder. A pressing force is applied to the movable cylinder 16 toward the tip side by a coil spring 17 that is compressed between the movable cylinder and the valve body 13a. A retaining ring 18 is fixed to prevent this. The movable cylinder 16 and the coil spring 17 are connected to the operating rod 15.
When the movable cylinder 16 moves to the right as seen in FIG. 2, the end surface near the outer periphery of the movable cylinder 16 comes into contact with a step in the lateral recess 14 formed on the left side of the valve body 13b, causing the valve body 13b to move to the right. It constitutes a pressing means for pushing. Returning coil springs 19 and 20 are compressed between each of the valve bodies 13a and 13b and the partition wall 5 or the valve seat 10. In addition, 2
1a and 21b indicate seals for sealing the end surfaces of the housing 3 and the valve seats 9 and 10, respectively.

An actuating device 31 is attached to the left end portion of the directional control valve 1 configured in this manner via a mounting plate 30 made of a magnetic material. This actuating device 31 includes an annular coil 33 disposed on the inner periphery of a yoke 32 made of a magnetic material, and a plunger 34 and a fixed iron core 35 are disposed at the central opening of the coil 33 and the directional control valve, respectively. It is located. A through hole is formed in the center of the fixed core 35 in the axial direction, and a rod 36 made of a non-magnetic material is loosely fitted into the through hole, and one end of the rod 36 is connected to the plunger 3.
4, and the other end thereof extends into the directional control valve 1 and terminates at a position where it abuts against the valve body 13a. In addition, numeral 37 is a bobbin, 38 is a plate,
39 indicates a cap. Such an actuating device 31 includes a fixed core 35, a plunger 34, a plate 38, and a yoke 32 to form a magnetic circuit.

According to the conventional directional control valve as described above, when the fixed core 35 of the actuating device 31 is excited, the plunger 34 moves and the rod 36 pushes the valve body 13a against the coil spring 19. As a result, the valve body 13a begins to move to the right as seen in FIG.
The movable cylinder 16 on the operating rod 15 comes into contact with the valve body 13b, and the coil spring 17 causes the valve body 13b to
is pushed out to the right by elastic force. The pushed-out valve body 13b comes into contact with the valve seat 10 and closes the second passage 11b. Furthermore, when the valve body 13a is pushed by the rod 36 and moves, the valve body 13b, which is already in contact with the valve seat 10, cannot move any further, so the movable cylinder 16 moves by the amount of movement.
compresses the coil spring 17 and moves relatively on the operating rod 15, and the tip of the operating rod 15 touches the valve body 13.
It further enters into the central recess 14 of b and escapes. Finally, the valve body 13a comes into contact with the partition wall 5 and closes the through hole 6, thereby opening the distribution chamber 1 of the first passage 4.
Cut off communication to 2a.

If the fixed iron core 35 is not energized, the valve body 1
3a and 13b are returned to their original positions shown in FIG. 2 by coil springs 19 and 20, and the valve body 13a closes the second passage 11a, and the valve body 13b comes into contact with the partition wall 5 and closes the through hole. 6 to block communication of the first passage 4 to the distribution chamber 12b.

In use of this directional valve, as shown in FIG. 3, the first passage 4 is connected to a negative pressure source;
The second passages 11a and 11b are open to the atmosphere, and the third passage 7 and fourth passage 8 are connected to cylinder chambers on both sides of the piston of the actuator 40, respectively, and the valve body 13 is connected to the actuator 31.
The movement of a and 13b causes the piston of the actuator 40 to reciprocate. Note that the reference numeral 41 indicates a load.

[Problem that the invention seeks to solve]

Since the conventional directional control valve is configured as described above, when the valve body 13b is fixed due to freezing or adhesion while the fixed core 35 of the actuating device 31 is not energized, the fixed core 35 is not energized. Even though
When the freezing force and adhesion force of the valve body 13b were greater than the compressive force of the coil spring 17, even if the valve body 13a moved, the valve body 13b did not move and switching was sometimes not performed. In addition, coil spring 17
If the compressive force of the valve body 13b is made larger than the freezing force and adhesion force of the valve body 13b, there are drawbacks such as the need to increase the suction capacity of the solenoid, which is the actuating device.

The present invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and an object of the present invention is to provide a directional control valve in which there is no malfunction of the valve body.

[Means for solving problems]

The present invention includes a plurality of valve bodies disposed in a plurality of distribution chambers defined by partition walls inside a housing, and an elastic body that moves the other valve bodies in conjunction with the movement of the valve body at the end. The directional control valve is equipped with a pressing means for moving the valve element through the partition wall, and the directional control valve includes a collision part that rigidly transmits the movement of the valve element at the end to the other valve element before the valve element at the end comes into contact with the partition wall. It is something.

[Effect]

According to the directional control valve of the present invention having such a configuration, when the fixed iron core of the actuating device is excited and the valve body at the end is moved by the rod, the movement of the valve body is caused by the movement of the other valve body through the elastic body. transmitted to the valve body. At that time, if the other valve bodies are stuck to the partition wall due to freezing, etc., the movement of the endmost valve body is rigidly transmitted to the collision part before the endmost valve body contacts the partition wall. Then, the moving force is applied directly to the other valve element, and as a result, the other valve element is released from the partition wall and caused to move.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the directional control valve of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a directional control valve according to an embodiment of the present invention. In the directional control valve of this example,
A valve body 13b is disposed within the distribution chamber 12b and is moved in contact with a movable cylinder 16 provided on the operating rod 15.
A spacer 22 is disposed at the bottom of the central recess 14 to reduce the depth of the central recess 14. The depth of the central recess of the valve body 13b due to this is the same as that of the operating rod 15.
The size is such that the tip of the operating rod 15 collides with the spacer 22 before the valve body 13a equipped with the valve body 13a comes into contact with the partition wall 5. Thereby, this spacer 22 and the tip of the operating rod 15 constitute a collision part that rigidly transmits the movement of the valve body 13a.

Since this spacer 22 is arranged to make the depth of the central concave portion of the valve body 13b a predetermined dimension, instead of this, the central concave portion 14 of the valve body 13b is
The depth may be set in advance to the above-mentioned condition, that is, a dimension such that the tip of the operating rod 15 contacts and pushes out the valve member 13b before the valve member 13a contacts the partition wall 5, or This is the movable cylinder 16 of the operating rod 15
The length may be extended to meet the above conditions. The rest of the structure is the same as the conventional directional control valve explained in FIG. 2, so the same reference numerals are given and the explanation thereof will be omitted.

The operation of the directional control valve of the above embodiment will now be described.

When the fixed core 35 of the actuating device 31 is excited,
The valve body 13a is pushed and moved in the axial direction by the rod 36. As a result, the tip of the operating rod 15 of the valve body 13a enters into the central recess 14 of the valve body 13b, and eventually the movable cylinder 1 is inserted into the stepped portion around the recess 14.
6 makes contact. At that time, if the valve body 13b does not move due to freezing or adhesion, and if the valve body 13a further moves in the axial direction, the movable cylinder 16 moves relatively on the operating rod 15 while compressing the coil spring 17, and operates. The end face of the rod 15 is located in the recess 1 of the valve body 13b.
4, the tip end surface of the operating rod 15 reaches the recess 14 of the valve body 13b.
This results in collision with the spacer 22 interposed in the
In this state, the plunger 34, rod 36,
The valve body 13a and the valve body 13b are rigidly connected, and the valve body 13b is forced to absorb the inertia force when the fixed core 35 is excited and the inertia force overcomes the freezing force, adhesive force, etc. of the valve body 13b. driven by. At this time, the valve body 13a closes the first passage 4, and the valve body 13b closes the second passage 11b.

〔Effect of the invention〕

As described above, according to the present invention, by the time the valve element at the end reaches the partition wall, the movement of the valve element is rigidly transmitted to the other valve elements. Even if the valve becomes inoperable due to the adhesion of sticky substances, for example, other valve bodies can be easily operated using the inertia force (impact force) of the solenoid, which is the actuating device. This has the advantage that there is no need to perform coating treatment on the surface of the valve body.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a directional control valve according to an embodiment of the present invention, Fig. 2 is a sectional view showing a conventional directional control valve, and Fig. 3 is a flow path system diagram when the directional control valve is used. It is. 3... Housing, 5... Partition wall part, 10a, 1
0b...Distribution chamber, 13a, 13b...Valve body, 15
...Operating rod, 16...Movable tube, 17...Coil spring, 22...Spacer. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1 A plurality of valve bodies are respectively arranged in a plurality of distribution chambers defined by partition walls inside the housing, and in conjunction with the movement of the valve body at the end, the other valve bodies are moved through an elastic body. In the directional switching valve, the movement of the valve element at the end is rigidly transmitted to the other valve element before the valve element at the end comes into contact with the partition wall. A directional control valve comprising: a.