JPS5844913B2 - The Greatest Man - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanically operated shutoff valve such as a flow control valve with a shutoff valve used in a feed control device of a machine tool.

Conventionally, this type of mechanically operated shutoff valve has two connection ports 32 and 3 provided in a valve body 31, as shown in FIG.
A shut-off valve spool 36 is installed in the communication holes 34 and 35 formed in parallel to communicate between the two ports, and a shut-off valve spool 36 is provided which mechanically operates to cut off communication between the connection ports, and a shut-off valve spool 36 which blocks flow in one direction between the connection ports and allows free flow in the other direction. The spring 41 forces the shut-off valve spool 36 toward the end surface by mechanically operating a cam member 39 provided on the movable part 38 of the machine tool, and the entire surface of the end surface. It moves against the back pressure on the connection port 33 side acting on the connection port 33 to isolate the connection between the connection ports.

However, the shutoff valve spool 36 and the reverse Ih valve body 37 are arranged separately in parallel, which has the disadvantage that the valve becomes large.

The present invention eliminates such drawbacks and provides a small mechanically operated shutoff valve in which the shutoff valve spool also serves as a check valve function.

Therefore, in the present invention, two connecting ports through which fluid flows in and out are provided in the valve body so as to communicate with each other through a communication hole that forms a valve seat, and one end is mechanically operable and protrudes outside the valve body to connect to the communication hole. Moves between a first position where the housing is biased by a spring force and one end protrudes most out of the valve body, and a second position where it is moved against the spring force by mechanical operation and is located at the moving end. An operating member is freely provided, and a valve body that engages and disengages from the valve seat to shut off communication between the connection ports is fitted to the outer periphery of the operating member, and the valve body is operated at a first position of the operating member. When the operating member is moved by a member to communicate between the connection ports, and the operating member is moved to a second position by mechanical operation, it engages with the valve seat to block the flow in one direction between the connection ports, and the flow in the other direction is controlled. Free flow is achieved by moving the outer periphery of the member.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Fig. 1 shows the case where it is used in a feed control device of a machine tool etc. in combination with a flow rate control valve, 1 is the valve body;
It has two connection ports 2 and 3, and is provided with a communication hole 7 in which a valve seat 6 is formed and connected to annular grooves 4 and 5 that communicate with the connection ports.

An operating member 10 is movably housed in a fitting hole 8 of a closing member 9 fixed to one end of the valve body 1, with one end protruding outside the valve body and the other end being inserted into the valve body.

Reference numeral 11 denotes a valve body, which is formed into a poppet shape so as to block communication with the communication hole 7 when engaged with and disengaged from the valve seat 6, and is fitted to the operating member 10 so as to be relatively movable. movement is regulated.

12 is a small spring engaged between the closing member 9 and the valve body 11;
A spring force is applied in the direction in which the valve body blocks the communication hole 7.

Reference numeral 14 denotes a large spring that biases the operating member 10 to one position protruding outside the valve body 1, and has a larger spring force than the spring force of the front spring 12. The throttle part A formed between the seat 6 and the seat 6 is fully opened.

15.16 is an OIJ song used as a sealing member to prevent external leakage of fluid.

17 is a variable throttle valve installed in a passage 18 provided in parallel with the connection ports 2 and 3, and a throttle 19 of the variable throttle valve.
In order to keep the flow rate of the fluid passing through the connection port 2 and 3 constant regardless of the pressure difference between the connection ports 2 and 3, the orifice H upstream of the throttle 19
A known pressure compensating valve spool 20 is installed to control the pressure.

The pressure compensation valve spool moves to an equilibrium position between the acting force due to the pressure difference before and after the throttle 19 and the force of the spring 21, and the orifice H
The opening degree is controlled and the pressure difference before and after the throttle valve 19 is kept constant, so that the flow rate set by the throttle valve 17 is kept constant.

The connection port 2 of the flow control valve is connected to a fluid cylinder 23 through a flow path 22, and the connection port 3 is connected through a flow path 24 to an electromagnetic directional control valve 25 having solenoids a and b.

Further, the electromagnetic switching valve 25 is connected to the fluid cylinder 23 through a flow path 26.

27 is a pressure source, 28 is a tank, 29 is a fluid cylinder 23
A movable part 30 of a machine tool or the like connected to the rod is a cam member provided on the movable part 29, which operates the operating member 10 by moving the movable part 29 forward.

Next, the operation of the above configuration will be explained.

When the solenoid a of the electromagnetic directional control valve 25 is energized in the illustrated state, the pressure fluid from the pressure source 27 flows through the flow path 26 and flows into the fluid cylinder 23, thereby driving the movable portion 29 forward.

Although the discharged fluid from the fluid cylinder 23 also flows through the passage 18 via the variable throttle valve 17, it mainly flows through the passage 22, the connection port 2, the communication hole 7 of the throttle part A1 in the fully open state, and the connection 3, and is discharged to the tank 28. As a result, the movable part 29 is fast forwarded.

When the cam member 30 engages with the head of the operating member 10, the operating member is pressed against the spring force of the dog spring 14 and descends.

The valve body 11 descends following the descent of the operating member 10 by its own weight and the spring force of the small spring 12, gradually narrowing the opening of the throttle portion A and decelerating the rapid feed speed of the movable portion 29.

When the throttle part A is constricted and the pressure difference between the front and rear sides becomes large, the pressure on the connection port 2 side acting on the back surface causes the valve body 11 to be rapidly lowered due to the force that assists the operating force of the operating member 10. It engages with the seat 6 and blocks the communication hole 7.

When the operating member 10 is further pressed and moved relatively, the spring force of the dog spring 14 acting on the valve body 11 is released, and the valve body is surely engaged with the valve seat 6.

The fluid flowing into the connection port 2 passes through the passage 18 and the orifice H1 throttle 19 and flows into the connection port 3 into the fluid cylinder 23.
The fluid discharged from the tank 2 is supplied with the flow rate set by the variable throttle valve 17.
8 and the movable part 29 is transported.

At this time, even if the load pressure fluctuates due to transportation processing, the flow rate flowing through the throttle 19 is kept constant by the pressure compensating valve mechanism, so that accurate transportation control is performed.

When processing by transportation is completed, solenoid a is demagnetized to stop the movable part 29, and then solenoid b is energized to flow in the other direction. Pressure fluid flows into the connection port 3 and engages with the valve seat 6. The valve body 11, which had been closed, is moved against the spring force of the small spring 12, and the communication hole 7 is made free to flow.

Therefore, the movable part 29 is quickly returned mainly by the free flow of fluid flowing through the communication hole 7, and the cam member 30 removes the operating force on the operating member 10, which is operated by the spring force of the large spring 14 as shown in the figure. It returns to one position where it communicates with the communication hole 7 as shown in FIG.

In the above embodiment, the pressure on the connection port 3 side is configured so that it does not act on the operating member 10 as back pressure at all.
The pressure-receiving area of the operating member may be selected to be small and one end of the operating member 10 may be installed within the communication hole, as shown in FIG.

In this way, the present invention provides two connection ports through which fluid flows in and out in a valve body, communicating with each other through a communication hole that forms a valve seat.
One end is mechanically operated so as to protrude out of the valve body and is housed in the communication hole, and is biased by a spring force to a first position where the one end protrudes the most out of the valve body and is mechanically operated to resist the spring force. An operating member is provided so as to be movable between a second position that is moved and located at a moving end, and a valve body that engages and disengages from the valve seat to interrupt communication between the connection ports is movable toward the outer periphery of the operating member. matingly provided, the valve body is moved by the operating member in the first position of the operating member to provide communication between the ports, and when the operating member is moved to the second position by mechanical operation, the valve seat By engaging with the control member to block the flow in one direction between the connection ports, and allowing the flow in the other direction to flow freely by moving the outer periphery of the operating member, it is possible to eliminate the need for separate reverse valves. , the number of holes to be machined in the valve body is reduced, allowing the valve to be made smaller.

Furthermore, since the valve body is fixed to the valve seat, it has the advantage of being able to reliably prevent fluid leakage when the connection ports are shut off.

[Brief explanation of the drawing]

Fig. 1 is a fluid circuit diagram in which the mechanically operated shutoff valve of the present invention is combined with a flow control valve and used in a feed control device of a machine tool, etc. Fig. 2 is a partial sectional view showing another embodiment;
The figure is a longitudinal sectional view of a conventional mechanically operated shutoff valve. 1... Valve body, 2, 3... Connection port, 6
...Valve seat, 7...Communication hole, 10...
. . . Operation member, 11 . . . Valve body.

Claims (1)

[Claims] 1. Two connection ports through which fluid flows in and out are connected through a communication hole that forms a valve seat and are provided in the valve body, and one end is mechanically operated by protruding outside the valve body and retracted into the communication hole by the force of a spring. An operating member is provided to be movable between a first position where it is biased and one end protrudes most out of the valve body and a second position where it is moved against a spring force by mechanical operation and is located at a moving end. , a valve body that engages and disengages from the valve seat to shut off communication between the connection ports is movably fitted to the outer circumference of the operating member, and the valve body is moved by the operating member at a first position of the operating member. When the operating member is moved to the second position by mechanical operation, it engages with the valve seat and blocks the flow in one direction between the connecting ports, and the flow in the other direction is restricted to the outer periphery of the operating member. Mechanically operated shut-off valve that allows free flow by moving parts.