JPS6315662Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field The invention has two valves that can be actuated individually.
A solenoid valve that allows communication between the IN port and the outlet port only when two valves operate together, and maintains communication between the outlet port and the discharge port when one valve does not operate. This invention relates to a solenoid valve used as an operating valve for a mechanical pneumatic clutch/brake.

Prior Art and Problems The structure shown in FIG. 5 is known as a solenoid valve used as an operating valve for a pneumatic clutch/brake of a press machine.

In FIG. 5, two openings 4 and 5 are provided between the supply chamber 2 connected to the IN port P of the valve body 1 and the fluid chamber 3 connected to the OUT port A, and the first opening 4 is opened and closed. A first valve and a second valve that opens and closes the second opening 5 are provided. A discharge chamber 8 connected to the discharge port R communicates with the fluid chamber 3 through two openings 9 and 10.

The first valve 6 includes a first valve body 6a that opens and closes the first opening 4, and a second valve body 6b that opens and closes the third opening 9.
and the first pilot port from the pilot solenoid valve.
The piston 6c receives pilot fluid pressure supplied through RL1. Similarly, the second valve 7 has a first valve body 7a, a second valve body 7b, and a piston 7c. Pilot fluid acting on the piston 7c is supplied from the second pilot port PL2.

In the non-operating state, the first valve body 6a of the first valve 6 closes the first opening 4 due to the action of the spring 11 and the spring 12, and the first valve body 7a of the second valve 7 closes the second opening 5. There is. At this time, the second valve bodies 6b and 7b open the third opening 9 and the fourth opening 10, respectively. In this standby state, no fluid, ie, air pressure, acts on the outlet port A, and the fluid in the portion communicating with the outlet port A is discharged from the discharge port R.

When the two valves are operated together by the operation of the pilot solenoid valve, the first valve bodies 6a, 7a open the openings 4, 5, and the second valve bodies 6b, 7b close the openings 9, 10. In this operating state, fluid is supplied from the IN port P to the outlet port A, and the fluid is supplied to the discharge chamber 8 and the fluid chamber 3.
The connection between the two is cut off.

If one valve, for example the first valve 6, is actuated, but the other valve, for example the second valve 7, is not actuated, as shown in FIG. 5, fluid is supplied to the fluid chamber 3 through the first opening 4. However, in the conventional solenoid valve, the flow path area S1 when the first opening 4 and the second opening 5 are opened is
Flow path area S ₂ when the opening 9 and the fourth opening 10 are opened
Since the relationship S ₁ <S ₂ is established between the two, most of the fluid flows through the valve that is not in operation, for example, the fourth opening where the second valve body 7b of the second valve 7 is not seated and is open. In other words, the clutch/brake is activated only when two valves are activated at the same time, but if one valve fails to operate, the air pressure necessary to activate the clutch/brake is discharged to the output port A. I've made sure that it doesn't happen.

In this way, in conventional solenoid valves, when one valve does not operate, the supply amount of the valve is limited in order to minimize the residual pressure in the output port. The supply volume through the clutch is restricted and the exhaust volume is increased, i.e., through the third and fourth openings, so that no operating pressure remains for the clutch and brake.

For this reason, even during normal operation, the supply amount of working fluid is reduced because it is restricted. The entire valve had to be made larger in order to increase the amount of supply.

Means for Solving the Problems The present invention solves the above problems by providing an annular opening/closing member slidably fitted around the first valve body of two valves, and an annular opening/closing member connected to the annular opening/closing portion, respectively. An interlocking body that interlocks with the movement of the valve is provided, and in the interlocking body position corresponding to the non-operating position of one valve, the annular opening/closing part connected to the interlocking body is in contact with the periphery of the first valve body of the other valve. an annular opening/closing part so as to seat the first valve body in the opening to be opened and closed and hold the opening in a closed state, and to move away from the annular opening and open the opening in a position corresponding to the operating position; The problem was solved by a solenoid valve that is characterized by the following:

Effects and Effects According to the present invention, the annular opening/closing part provided on the other valve is moved according to the movement of one valve, and when one valve is inactive, the annular opening/closing part provided on the other valve is moved even if the first valve body of the other valve opens the opening. The opening/closing portion maintains a closed state between the opening portion and the first valve body. Therefore, even in a valve with an open opening, by using the annular opening/closing part, the closed state is maintained and fluid is prevented from flowing into the fluid chamber from the supply chamber. When both valves operate together, the annular opening/closing portion moves together with the first valve body to completely open the opening.
As a result, the size of the flow path area of the opening between the supply chamber and the fluid chamber, which is opened and closed by the first valve body, no longer needs to be limited in consideration of the flow to the discharge port as in the past. .

According to the present invention, if one of the valves fails and becomes inoperative, the fluid supply to the valve that is in operation can be cut off, making it easier to regulate the residual pressure in the fluid chamber.
Furthermore, since the flow path area of the opening is not limited, it has become possible to make the entire electromagnetic valve more compact.

Embodiment The details of the structure and operation of the present invention will be explained based on the embodiment shown in the drawings.

The structure of the main valve is shown in FIGS. 1 and 2 with the pilot solenoid valve omitted.

A supply chamber 2 connected to the IN port P in the valve body 1;
A fluid chamber 3 connected to the OUT port A and a discharge chamber 8 connected to the discharge port R are provided, two openings 4 and 5 are provided between the supply chamber 2 and the fluid chamber 3, and the fluid chamber 3 and the discharge chamber 8 are provided. Two openings 9 and 10 are provided between the chamber 8 and the chamber 8.

A first valve 6 having a first valve body 6a that opens and closes the first opening 4 and a second valve body 6b that opens and closes the third opening 9; and a first valve body 7a that opens and closes the second opening 5; Two sets of second valves 7 each having a second valve body 7b that opens and closes the second opening 10 are provided in the valve body 1.

A first annular opening/closing portion 13 is slidably fitted on the outer periphery of the first valve body 6b of the first valve 6. Similarly, a second annular opening/closing portion 14 is slidably fitted on the outer periphery of the first valve body 7b of the second valve 7. A first annular opening/closing portion 13 provided on the first valve 6 is connected to a first interlocking body 15 that moves in conjunction with the movement of the second valve 7 by a connecting member 16. Second annular opening/closing part 14 provided on the second valve 7
is connected by a connecting member 18 to a second interlocking body 17 that moves in conjunction with the movement of the first valve 6. First interlocking body 1
5 and the second interlocking body 17 may have any structure as long as they move following the movements of the valves 6 and 7, respectively, but in the illustrated example, they are formed as spring seats for the springs 11 and 12, respectively.

The first interlocking body 15 is moved by the spring 12 to the first valve body 7a.
, the second interlocking body 17 is moved by the spring 11 to the first valve body 6.
Since the first valve body 7a and the first valve body 6a are pressed against the point a, they reciprocate following the vertical movement of the first valve body 7a and the first valve body 6a in the figure.

In Figure 1, which shows the standby state, the pilot solenoid valve (not shown) does not operate, and the first pilot port PL
Since pilot fluid is not supplied to the first and second pilot ports PL2, the pistons 6c and 7c
Since no pilot pressure acts on the first valve 6 and the second valve 7, the first valve bodies 6a and 7a are seated in the openings 4 and 5 and closed by the action of the spring 11 or 12, and the second valve body is closed. 6b and 7b are in a state where the openings 9 and 10 are open. In this state, no fluid is supplied to the outlet port A, and the outlet port A is in the discharge state.

The pilot solenoid valve operates and the pistons 6c and 7c
When both receive pilot pressure, they enter the operating state shown in FIG. close. Since both the first interlocking body 15 and the second interlocking body 17 move together with the first valve bodies 7a and 6a, the first annular opening/closing part 13 is in a shape that has almost moved together with the first valve body part 6a of the first valve 6. Thus, the second annular opening/closing portion 14 is in a shape that has moved substantially together with the first valve body portion 7a of the second valve 7. Therefore, between the first opening 4 and the first valve body 6a and between the second opening 5 and the second valve body 7
A is sufficiently opened.

If an accident occurs in the pilot solenoid valve or the main valve and only one valve operates and the other valve does not operate,
For example, as shown in FIG. 4, when the first valve 6 is in operation and the second valve 7 is not in operation, in an incomplete operation state, the second interlocking body 17 moves due to the movement of the first valve 6 which is in operation, and the second annular The opening/closing part 14 is separated from the second opening 5,
It moves relative to the first valve body 7a which is in an inoperative state.
Although the second annular opening/closing part 14 separates from the second opening 5, the first valve body 7a of the second valve 7 remains seated in the second opening 5 and closed.

On the other hand, since the second valve 7 is in the non-operating position, the first interlocking body 15 is maintained in the non-operating position.
Therefore, the first annular opening/closing portion 13 is also held in the non-operating position. The first annular opening/closing part 13 is seated in the first opening 4 in the inoperative position. In this state, the first
Even when the valve 6 moves to the operating position, the first valve body 6a is surrounded by a part of the first annular opening/closing part 13 as shown in FIG. It is cut off between Therefore, although the first opening 4 itself is not closed by the first valve body portion 6a, fluid does not flow into the fluid chamber 3 through the first opening 4. Even if fluid were to flow in through the gap between the first valve body 6a and the first annular opening/closing portion 13, the amount would be extremely small and no operating pressure would be generated at the outlet port A. For example, the clutch of a Pires machine
Even if the press machine is connected to the brake, the clutch remains off and the brake is on, ensuring safety when working on the press machine.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main valve part of the solenoid valve according to the present invention in the non-operating position, FIG. FIG. 4 is a view corresponding to FIG. 1 showing a state when only one valve is in the operating position, and FIG. 5 is a sectional view of the main valve portion of the conventional electromagnetic valve. 1... Valve body, 2... Supply chamber, 3... Fluid chamber,
4, 5...opening, 6...first valve, 7...second
Valve, 6a, 7a...first valve body, 6b, 7b...second valve body, 8...discharge chamber, 9, 10...opening, 1
3, 14... Annular opening/closing part, 15, 17... Interlocking part, P... IN port, A... OUT port, R...
…Exhaust port.

Claims (1)

[Scope of utility model registration request] Two valves are provided in the valve body, which has a supply chamber connected to the IN port, a fluid chamber connected to the OUT port, and a discharge chamber connected to the discharge port, and each valve is connected between the supply chamber and the fluid chamber. a first valve body that opens and closes an opening between the fluid chamber and the discharge chamber, and a second valve body that opens and closes an opening between the fluid chamber and the discharge chamber, and one of the first valve body and the second valve body of each valve. A solenoid valve with a pilot which can be switched to close when the other is open, includes an annular opening/closing part slidably fitted in the first valve body of each of the two valves, and an annular opening/closing part connected to the annular opening/closing part. an interlocking body interlocking with the movement of the other valve, the annular opening/closing part being spaced from the opening in the operating position and seated in the opening in the non-operating position, and the first valve body of the valve in the operating position; What is claimed is: 1. A solenoid valve that surrounds a part of the opening and is formed so as to be able to isolate a space between the opening and the first valve body from a supply chamber.