JPH04351386A - Pilot control selector valve - Google Patents

Abstract

PURPOSE:To facilitate valve assembling work by attaching a circuit board, a solenoid body and a cover monolithically to a main valve body by using a common mounting bolt, and to reduce the number of parts by forming plural passages and a pilot solenoid valve using the the circuit board. CONSTITUTION:A circuit board 21 is placed on the upper surface of a main valve body 1, and also two solenoid bodies 22A and 22B which compose two pilot solenoid valves 20A and 20B are placed on the upper surface of the circuit board 21. The inner surface of an upper wall 48 of a cover 47 is made contact with the solenoid bodies 22A and 22B, and also the solenoid bodies 22A and 22B and the circuit board 21 are fixed to the main valve body 1, so as to facilitate assembling work. Furthermore, pilot passages 17A and 17B, a pilot supply passage 18. a pilot discharge passage 19 and the like are formed by using the circuit board 21, and also pilot electromagnetic valves 20A and 20B are composed of supply valve seat 25A and 25B and recesses 23A and 23B, so as to reduce the number of part items.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot-operated switching valve that controls the discharge of pressurized fluid from pilot chambers formed at both ends of a main valve body using a pilot electromagnetic valve to switch and move a main valve spool.

0002

2. Description of the Related Art Such a pilot-operated switching valve is described in Japanese Patent Application Laid-Open No. 62-4983. This device is mounted on the main valve body containing the main valve spool and attached with a circuit board that forms a passage for the pilot solenoid valve.The pilot solenoid valve is mounted on this circuit board, and A cover covering the pilot solenoid valve is attached to the circuit board.

0003

[Problem to be solved by the invention] However, this Japanese Patent Application Publication No. 6
In the configuration described in Publication No. 2-4983, the circuit board is fixed to the main valve body, the pilot solenoid valve to the circuit board, and the cover to the circuit board with mounting bolts, so it is difficult to screw in the mounting bolts. There is a problem that the valve cannot be easily assembled because there are many parts. The present invention solves this problem by providing a pilot-operated switching system that allows the circuit board and the pilot solenoid valve to be fixedly attached by attaching the cover using mounting bolts, thereby making it easy to assemble the valve. It is intended to provide a valve.

0004

[Means for Solving the Problems] Therefore, the present invention includes a main valve body in which a pilot chamber is formed at both ends of the main valve body and accommodates the main valve body so as to be able to switch freely. A pilot passage through which pressurized fluid flows in and out of the pilot chamber for switching movement, and each pilot solenoid valve in which two solenoid bodies are placed to form pilot solenoid valves and each communicate with the pilot passage of the main valve body. It has a circuit board that has an output hole and is placed on the main valve body, and a cover that has a box shape with one side open and is placed on each solenoid body on the inner surface of the upper wall with the open side facing downward. , each solenoid body is mounted on a circuit board, and the movable iron core that is attracted to the fixed iron core when the coil is energized is housed in the inner hole that forms an output chamber in which the output hole of the pilot solenoid valve is communicated with the circuit board. At the same time, a through hole is formed by opening on the top surface where the cover is placed and the bottom surface where the circuit board is placed, and a discharge hole is formed around the opening to the output chamber provided in the fixed core as a discharge valve seat for each solenoid body. A hole is formed through the upper surface on which the cover is placed, and the discharge hole of each solenoid body communicates with the through hole between the mutual joint surface between the upper surface of each solenoid body and the inner surface of the upper wall of the cover placed thereon. A communication groove is formed, and a communication path is formed on the circuit board that connects the through hole of each solenoid body to the pilot discharge passage formed in the main valve body, and the area around the opening to each output chamber is opened and closed by a movable iron core. A supply hole communicating with a pilot supply passage formed in the main valve body as a supply valve seat is formed in the circuit board, and the circuit board, each solenoid body, and the cover are connected to each other through the cover and screwed into the main valve body. It is integrally attached to the main valve body using mounting bolts.

[0005]

[Operation] According to the present invention having such a configuration, the circuit board is placed on the main valve body, the solenoid body is placed on the circuit board, and the cover is placed on the solenoid body, and the mounting bolts that pass through the cover are screwed into the main valve body. Once installed, the circuit board and solenoid body form a pilot solenoid valve, and the circuit board, solenoid body, and cover are integrally attached to the main valve body, making valve assembly extremely simple compared to conventional valves. Ru.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a main valve body formed by a body 2 and end covers 3 and 4;
A spool 6 that is fitted into the sleeve 5 and serves as a main valve body is housed inside so as to be able to switch and move freely in the axial direction, and pistons 7 and 8 are provided at both ends of the spool 6.
Pilot chambers 9A and 9B are formed between them.

In the left switching position of FIG. 1, where the detent ball 10 is engaged with the detent groove 11A of the spool 6, the spool 6 connects the supply port 12 provided in the body 2 to the output port 1.
3, the output port 14 is communicated with the discharge port 15, and in the right switching position where the detent ball 10 fits into the detent groove 11B, the supply port 12 is communicated with the output port 14, and the output port 13 is communicated with the discharge port 16. It is configured like this,
In addition, the body 2 is provided with pilot passages 17A and 17B communicating with the pilot chambers 9A and 9B, respectively, a pilot supply port 18 communicating with the supply port 12, and a pilot discharge passage 19 opened on the upper surface 2A. ,
The lower end of the pilot discharge passage 19 is connected to the lower surface 2B of the body 2.
It is open to

As is well known, the main valve body 1 is mounted on a manifold M, and at this time, a supply port 12, output ports 13 and 14, discharge ports 15 and 16, and a pilot discharge passage 19 are installed. are the supply passage P, output passages A and B, and discharge passages E1 and E of manifold M.
2. Each communicates with a pilot discharge passage PE, and here, although not shown, the supply passage P of the manifold M is connected to a fluid pressure source, the output passages A and B are connected to an actuator, and the discharge passages E1 and E2 are opened to the atmosphere. At the same time, the pilot exhaust passage PE is also opened to the atmosphere.

Reference numerals 20A and 20B are pilot solenoid valves formed by a circuit board 21 placed on the upper surface 2A of the body 2, and solenoid bodies 22A and 22B placed on the circuit board 21. The circuit board 21 has recesses 23A and 23B formed on its upper surface,
Pilot passages 17A are provided in the recesses 23A and 23B, respectively.
, 17B are opened, and output holes 24A and 24B are opened,
In addition, supply holes 26A and 26B are formed with supply valve seats 25A and 25B surrounding the openings. Each supply hole 26A, 26B is connected to a communication groove 2 provided on the lower surface of the circuit board 21.
7, it communicates with a pilot supply passage 18 of the body 2.

The solenoid bodies 22A and 22B have the same configuration, and the details will be explained with respect to the solenoid body 22A on the left side of FIG. do. 28A is a downwardly open inner hole provided in the center of the solenoid body 22A, and the movable iron core 29
A is fitted so as to be movable in the vertical direction. A fixed iron core 30A is arranged above the movable iron core 29A, and a coil 31A and a yoke 32A are arranged around the inner hole 28A and covered with a molded body 33A made of synthetic resin. A discharge hole 36A that forms a discharge valve seat 35A around the opening, which is opened and closed by a sheet body 34A provided at the upper end of the movable core 29A, is opened in the fixed core 30A, and the discharge hole 36A extends upward through the fixed core 30A. It opens at the top surface of the solenoid body 22A. The solenoid body 22A is placed on the upper surface of the circuit board 21 so as to close the inner hole 28A, and the inner hole 28A is located in the recess 23.
Together with A, it forms an output chamber 37A of the pilot electromagnetic valve 20A that accommodates the movable core 29A, and a seat body 38A that opens and closes the supply valve seat 25A is provided at the lower end of the movable core 29A. Note that 39A is a spring that urges the movable core 29A to the normal position, which closes the supply valve seat 25A and opens the discharge valve seat 35A when the coil 31A is de-energized.

As shown in FIGS. 2 and 3, the solenoid body 22A has two bolt holes 40A and a through hole 41A, which becomes a part of the discharge passage, which are opened in the upper and lower surfaces of the molded body 33A and penetrated through the molded body 33A. On the top surface of the plate 21, FIGS.
As shown in FIG. 5, a communication groove 42 that communicates with the openings of the through holes 41A and 41B is formed on the lower surface of both solenoid bodies 22A and 22B, and this communication groove 42 is connected to the upper surface 2A of the body 2 on the lower surface of the circuit board 21. Pilot discharge passage 1 opening to
9 through a through hole 44, and these communication grooves 42, 43 and the through hole 44 form a communication path 45. Note that the open side of the communication groove 42 is closed by a packing 46.

Reference numeral 47 denotes a box-shaped cover with one side open, with the open side facing downward, and the inner surface of the upper wall 48 covers the solenoid bodies 22A, 22B and the circuit board 21. As shown in FIG. 3, four mounting bolts 49 are inserted through the cover 47, passed through the bolt holes 40A and 40B of both solenoid bodies 22A and 22B, and passed through the circuit board 21 to the top surface 2A of the body 2. By screwing on,
A cover 47 is integrally attached to the main valve body 1 together with the circuit board 21 and both solenoid bodies 22A and 22B. The inner surface of the upper wall 48 of the cover 47 has a communication groove 50A that communicates the upper end opening of the discharge hole 36A and the through hole 41A of the solenoid body 22A with each other, and
A communication groove 50B is provided that communicates the upper end openings of the discharge hole 36B and the through hole 41B in 2B with each other.

Note that 51A and 51B in FIG. 1 are operation pins for manually switching and moving the spool 6.
Further, 52 in FIG. 6 is a packing, and 53 is a positioning pin.

Next, the operation of this embodiment will be explained. In the state shown in FIG. 1, both the pilot solenoid valves 20A and 20B are in the normal position, and the pilot chambers 9A and 9B communicate with the pilot discharge passage 19 through the discharge holes 35A and 35B, the through holes 39A and 39B, and the communication passage 45. and detent groove 1
1A, the spool 6 is kept in the left switching position and the supply port 12 is connected to the output port 13.
Output port 14 communicates with discharge port 15 . Here, when the coil 31A of the pilot solenoid valve 20A is energized, it is attracted by the fixed iron core 30A, the movable iron core 29A rises, closes the discharge valve seat 35A, and opens the supply valve seat 25A to switch to the operating position, and the pilot chamber 9A Pressure fluid is introduced from the supply hole 25A to switch the spool 5 to the right switching position. Next, when the power to the coil 31A is cut off, the movable iron core 29A is returned by the spring 39A, and the pilot solenoid valve 20A again assumes the normal position as shown in FIG. 1, and discharges the pressure fluid in the pilot chamber 9A to the pilot discharge passage 19. , the detent ball 10 engages with the detent groove 11B, and the spool 6 is maintained at the right switching position, and at this time, the supply port 12 is communicated with the output port 14, and the output port 13 is communicated with the discharge port 16.

Furthermore, in this state, the pilot solenoid valve 20B
When the coil is energized and switched to the operating position, pressure fluid is introduced into the pilot chamber 19B, the spool 6 is switched to the left switching position as shown in FIG.
is engaged with the detent groove 11A, and the pilot solenoid valve 20B
Even if the spool 6 is switched to the normal position as shown in FIG. 1 by stopping the energization to the coil, the spool 6 is maintained at the left switching position.

[0016] If a plurality of pilot-operated switching valves are installed in the manifold M, the pressure in the pilot passage PE will rise slightly due to the discharge of pressure fluid accompanying the switching operation of any one of the valves. However, when the spool 6 is held in the left or right switching position by engagement of the detent ball 10 with the detent groove 11A or 11B, each pilot chamber 9A, 9B is connected to the same pilot discharge passage 19 by the pilot solenoid valve 20A, 20B. Even if there is a pressure rise as described above in the pilot passage PE, the pressure of the pilot passage PE is introduced into both the pilot chambers 9A and 9B and the pressure becomes the same, so that the spool The switching position of the spool 6 is well maintained since no force is generated to displace the spool 6 from its retained switching position.

[0017] The circuit board 21 and the solenoid body 22A
, 22B, the cover 47 can be integrally attached to the main valve main body 1 by screwing the common mounting bolt 49 to the body 2, so that the assembly work can be easily performed. Pilot solenoid valve 20
A and 20B are covered with a cover 47 to protect them from external blows and the like. The circuit board 21 also includes pilot passages 17A, 17B and a pilot supply passage 18 in the main valve body 1.
, pilot discharge passage 19, and pilot solenoid valve 20A
, 20B, as well as supply valve seats 25A, 25B and recesses 23A, 23B to connect the pilot solenoid valve 20A with the solenoid bodies 20A, 20B.
, 20B, the number of parts is reduced, and the discharge holes 36A, 36B of the solenoid bodies 22A, 22B are formed.
The communication means between the through holes 41A and 41B are communication grooves 50A and 50B provided on the inner surface of the upper wall 48 of the cover 47 placed on the solenoid bodies 22A and 22B. Coupled with the fact that it is not necessary to provide a unique end cap formed with a 100 mm diameter, a small-sized pilot-operated switching valve is obtained.

In the embodiment, the communication path 45 includes a communication groove 42 on the upper surface of the circuit board 21 and a communication groove 43 on the lower surface of the circuit board 21.
4, but without using such communication grooves 42 and through holes 44, through holes are formed in the circuit board 21 so as to communicate with the through holes 41A and 41B, respectively, and communicate with the communication groove 43 on the lower surface thereof. You can also. The communication groove 27 for the supply fluid provided on the lower surface of the circuit board 21 and the communication groove 43 for the discharge fluid can be formed on the upper surface 2A of the body 2 as necessary. 22A, 22
The communication grooves 50A and 50B that communicate the discharge holes 36A and 36B of B and the through holes 41A and 41B are provided on the inner surface of the upper wall 48 of the cover 47, and the covers 47 of the solenoid bodies 22A and 22B are placed on the communication grooves 50A and 50B. It can also be provided on the top surface.

[0019]

As described above, in the present invention, the circuit board, solenoid body, and cover are integrally attached to the main valve body by a common mounting bolt that is inserted through the cover and screwed onto the main valve body. Assembly work can be done easily. The circuit board not only provides a flow path between the pilot solenoid valve and the pilot passage, pilot supply passage, and pilot discharge passage of the main valve body, but also forms the pilot solenoid valve together with the solenoid body. The number of parts is reduced, and because of this and the communication between the discharge hole and the through hole of each solenoid body, the connection between the upper surface of each solenoid body and the inner surface of the upper wall of the cover placed thereon is improved. By using the flow groove provided in the solenoid body, there is no need to provide a member such as an end cover with a communication means between the discharge hole and the through hole, and a small pilot-operated switching valve can be obtained. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention placed on a manifold.

FIG. 2 is a partial cross-sectional view taken along line 100-100 of FIG. 1.

FIG. 3 is a partial cross-sectional view taken along line 102-102 of FIG. 2;

FIG. 4 is a partial cross-sectional view taken along line 103-103 of FIG. 3;

FIG. 5 is a partial cross-sectional view taken along line 104-104 of FIG. 4.

FIG. 6 is a partial cross-sectional view taken along line 101-101 in FIG. 1.

[Explanation of symbols]

1 Main valve body 6 main valve body 9A, 9B pilot room 17A, 17B pilot passage 19 Pilot discharge passage 20A, 20B pilot solenoid valve 21 circuit board 22A, 22B solenoid body 24A, 24B output hole 25A, 25B supply valve seat 26A, 26B supply hole 28A inner hole 29A, 29B movable iron core 30A fixed core 31A coil 35A discharge valve seat 36A, 36B discharge hole 37A, 37B output room 41A, 41B through hole 45 passages 47 cover 48 upper wall 49 mounting bolt 50A, 50B communication groove

Claims (1)

[Claims] Claim 1: A main valve body in which a main valve body is accommodated with pilot chambers formed at both ends thereof so as to be able to switch and move freely, and a pressure that is formed in the main valve body and flows in and out of the pilot chamber for switching and moving the main valve body. The main valve body has a pilot passage through which fluid flows, and two solenoid bodies are mounted to form pilot solenoid valves, respectively, and output holes for each pilot solenoid valve communicate with the pilot passages of the main valve body. It has a circuit board on which it is placed, and a cover that is shaped like a box with one side open and is placed on each solenoid body on the inner surface of the upper wall with the open side facing downward, and each solenoid body is placed on the circuit board. The inner hole forming the output chamber with the output hole of the pilot solenoid valve communicated with the circuit board accommodates the movable core that is attracted to the fixed core when the coil is energized, and the top surface on which the cover is placed and the circuit board. A through hole is formed in the lower surface on which the cover of each solenoid body is placed, and a through hole is formed in the upper surface on which the cover of each solenoid body is placed, and a discharge hole is formed around the opening to the output chamber provided in the fixed core as a discharge valve seat. A communication groove is formed between the mutual joint surface of the upper surface of each solenoid body and the inner surface of the upper wall of the cover placed thereon to communicate the discharge hole and the through hole of each solenoid body, and a communication groove is formed in the circuit board. The through-hole of each solenoid body is formed in the main valve body to form a communication passage that communicates with the pilot discharge passage, and the area around the opening to each output chamber is formed in the main valve body as a supply valve seat that is opened and closed by a movable iron core. Supply holes communicating with the pilot supply passages are formed on the circuit board, and the circuit board, each solenoid body, and the cover are integrally attached to the main valve body by a common mounting bolt that is inserted through the cover and screwed onto the main valve body. A pilot-operated switching valve characterized by the fact that it is installed.