WO2006004079A1

WO2006004079A1 - Bimanual control valve

Info

Publication number: WO2006004079A1
Application number: PCT/JP2005/012302
Authority: WO
Inventors: Hiroshi Hanne
Original assignee: Smc Corporation
Priority date: 2004-07-06
Filing date: 2005-07-04
Publication date: 2006-01-12
Also published as: JP4264951B2; DE112005001643T5; CN100532866C; JP2006022852A; DE112005001643B4; CN1981136A

Abstract

A bimanual control valve has a valve body (10) which is equipped with an AND valve (20) and a shuttle valve (21) which are connected to main input ports (11a, 11b), a main switching valve (23) connected between the AND valve (20) and a main output port (12), and a tank (30) connected to the output port (21b) of the shuttle valve (21) through a throttle (26). The AND valve (20), shuttle valve (21), and main switching valve (23) have their valve holes drilled from the upper surface of the valve body (10). A plate (33) for closing the ends of those valve holes and a cover (31) forming the tank (30) are airtightly fixed to the upper surface of the valve body. The plate (33) is drilled with communication holes (33a, 33b) required for connecting the tank (30) to main switching valve (23) and the throttle (26).

Description

Specification

Control valve for two-hand operation

Technical field

The present invention relates to a control valve for two-hand operation that is used when driving a fluid pressure drive device that needs to keep both hands away from a hazardous area.

Background art

[0002] A control valve for two-hand operation is used when an operator who manually operates a fluid pressure device has a risk of hand injury caused by the operation of the fluid pressure drive device. Conventional power is known.

In other words, this control valve for two-hand operation is used, for example, when it is necessary to keep both hands away from the danger area when starting the pneumatic cylinder. When operated within 0.5 seconds, signal pressure is output to the output side based on the pressure of both inputs supplied through those push button valves, and one of the push button valves When both hands are released, the signal pressure to the output side is cut off immediately, and the drive of the pneumatic cylinder, etc. in the fluid pressure drive device that was driven by the signal pressure is stopped.

[0003] In recent years, there has been a demand for simplification and downsizing of the configuration of various devices, and there is a demand for simplification and downsizing of the configuration of the entire control valve even in a two-hand control valve that performs the above-described operation. In order to reduce the size of the control valve for two-hand operation, the control valve is configured to accommodate a number of valves having various functions in the valve body. If it is necessary to reduce the size, it is necessary to accommodate them in a compact valve body.

Disclosure of the invention

Problems to be solved by the invention

[0004] A technical problem of the present invention is to provide a control valve for two-hand operation, which can make the overall configuration as simple and compact as possible.

Another technical problem of the present invention is to provide a large number of valves having various functions in the valve body. The two-handed control valve configured to be accommodated is to be compact and compact by considering the miniaturization of the valves and at the same time by appropriately arranging the valves.

Another technical problem of the present invention is to provide a control valve for two-hand operation which can easily manufacture and process a valve body.

Means for solving the problem

[0005] A control valve for two-hand operation of the present invention for solving the above-mentioned problem is that two manually operated valves operated by left and right hands are connected to two main input ports of the valve body, respectively. A control valve for two-hand operation that outputs air pressure from the main output port to the fluid pressure drive device based on the output of the manually operated valve when the valve is operated within a certain period of time. Inside, connect one of the pair of input ports to the two main input ports, and the valve and shuttle valve connected between the two main input ports, and the valve input port is connected to the output port of the AND valve. A main switching valve having a valve output port connected to the main output port and a tank connected to the output port of the shuttle valve via a throttle. The capacity is set so that the time force until the tank internal pressure becomes a constant set pressure by the compressed air flowing in through the above-mentioned restriction is set to a time difference allowed for the operation of the two manually operated valves. In the control valve for two-hand operation, the pressure in the tank is applied to the valve member of the main switching valve, and the communication between the valve input port and the valve output port of the main switching valve is cut off by the set pressure. A cover for forming the tank is airtightly fixed on the upper surface of the valve body, and the valve holes of the AND valve, shuttle valve, and main switching valve are opened from the upper surface of the valve body. A plate for closing the valve holes is hermetically fixed to the upper surface of the valve body, and a communication hole for guiding the pressure in the tank to the first pressure receiving end surface of the valve member in the main switching valve, and shuttle Is characterized in that the bored communication hole for communicating with the tank and through the aperture of the flow path from the lube.

In a preferred embodiment of the present invention, the main switching valve is a spool valve, a valve input port to which compressed air from the AND valve is supplied to the valve hole, and the switching valve. A valve output port for outputting compressed air to the main output port, and compression of the valve output port A spool-type valve member that opens a balance pressure port that causes air pressure to act on the second pressure receiving end surface opposite to the first pressure receiving end surface of the valve member, and that slides in the valve hole, A land that opens and closes the flow path connecting the valve input port and the valve output port is provided, a return spring is accommodated on the second pressure receiving end face side of the valve member in the valve hole, and the pressure in the tank reaches the set value. If not, the return spring moves the valve member to the tank side, thereby holding the valve member in a switching position where the valve input port and the valve output port are communicated. When pressure exceeds the set pressure and accumulates and acts on the first pressure receiving end surface of the valve member, the valve member is pressed by overcoming the urging force of the return spring, and the valve member is connected to the valve input port and the valve output port. Is held at the switching position that blocks the flow path connecting It is structured as follows.

[0007] In this case, the valve member in the spool-type main switching valve has a shaft diameter that acts on the valve member by making the seat diameter of the circumferential surface of the pressure-receiving end face at both ends thereof substantially the same as the seat diameter of the land. It is desirable to balance the pressure in the line direction.

[0008] In another preferred embodiment of the present invention, the two main input ports are arranged side by side vertically at a position near one half of one side surface of the substantially rectangular parallelepiped valve body. The main output port and the exhaust port for discharging the air pressure from the main output port are arranged side by side in a position close to the other half, and the and valve and shuttle valve are arranged behind the main input port. Then, they are communicated with a flow path that leads to the main input port, and the main switching valve is disposed behind the main output port and the exhaust port so as to be aligned with the AND valve.

[0009] In another preferred embodiment of the present invention, the valve output port of the main switching valve is communicated with the main output port through the exhaust flow path of the quick exhaust valve having a check function. The exhaust valve member is formed of a rubber elastic member, a check function portion is provided around the exhaust valve member, and the exhaust valve seat leading to the exhaust port and the valve of the main switching valve are provided on both end faces of the exhaust valve member. If there is a seat part that contacts and separates from the outlet valve seat leading to the output port, and there is output pressure at the valve output port of the main switching valve, the exhaust valve member is pressed against the exhaust valve seat side and one of the seats Closes the exhaust valve seat, and the output of the valve output port flows out through the check function section, and passes through the exhaust passage. When there is no output pressure at the valve output port, the exhaust valve member is pressed against the outlet valve seat side, the exhaust valve seat is opened, and the compressed air at the main output port is It is configured to be rapidly exhausted from the exhaust port through the passage.

Brief Description of Drawings

FIG. 1 is a block configuration diagram of a basic circuit when a control valve for two-hand operation according to the present invention is used for driving a fluid pressure drive device.

FIG. 2 is a front view showing an embodiment of a control valve for two-hand operation according to the present invention.

3 is a cross-sectional view taken along line III-III in FIG.

4 is a cross-sectional view taken along line IV—IV in FIG.

FIG. 5 is a cross-sectional view taken along line V—V in FIG.

FIG. 6 is a cross-sectional view taken along line VI—VI in FIG.

FIG. 7 is a schematic enlarged longitudinal sectional view of a spool type main switching valve in the valve body.

8 is a cross-sectional view taken along line VIII-VIII in FIG.

Explanation of symbols

1 Control valve for two-hand operation

2a, 2b Manually operated valve

3 Air pressure source

5 Fluid pressure drive equipment

6 Pneumatic cylinder

7a, 7b speed controller

8 Switching valve

9 Pressure source

10 Valve body

11a, l ib Main input port

12 Main output port

13 Exhaust port

14 mail And valve

a Input port

b Output port

Shuttle valve (or valve) a Input port

b Output port

Main switching valve

a Valve input port

b Valve output port

c Residual pressure discharge port

d Balance pressure port

Flow control element

Aperture

Check valve

Tank

Kano Kuichi

plate

a, 33b Communication hole

Valve member

a, 35b Pressure receiving end face

Valve hole

a, 37b rand

Return spring

Quick exhaust valve

Exhaust valve member

a Check function section

b, 41c Seat part

Exhaust flow path 43 Exhaust valve seat

44 Outlet valve seat

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a basic circuit when the control valve for two-hand operation according to the present invention is used for driving a fluid pressure drive device. In this basic circuit, the two-hand control valve 1 according to the present invention is provided, and two manually operated valves (specifically, three-port push button valves) 2a and 2b that are operated separately by the left and right hands are provided. A fluid pressure drive device 5 connected to the device and operating based on the output of the two-hand control valve 1 is further provided. The manual operation valves 2a and 2b supply compressed air from the air pressure source 3 to the control valve 1 for both-hand operation by pressing the push button on the head, and release the push button to the control valve 1 by releasing the push button. The compressed air that has been supplied is discharged to the outside.

[0013] As the fluid pressure drive device 5, here, a pneumatic cylinder 6 for driving various devices, a pair of speed controllers 7a, 7b for controlling the reciprocating drive speed, and the control valve for both-hand operation 1 A pneumatic drive switching valve 8 for controlling the driving of the pneumatic cylinder 6 based on the output of the pressure cylinder and a pressure supply source 9 for supplying compressed air to the pneumatic cylinder 6 through the switching valve 8 are shown. This switching valve 8 uses the output pressure of the control valve 1 for two-handed operation as the pilot fluid pressure, and drives the pneumatic cylinder 6 in a dangerous direction while it is supplied. When the pressure drops, the fluid pressure drive device 5 is appropriately driven and the output pressure of the control valve 1 is not limited to the force-driven configuration, which is configured as a 5-port valve that returns the pneumatic cylinder 6 to the safe side. Various mechanisms can be adopted that immediately stop the equipment on the safe side when the temperature drops.

As shown in FIG. 1, the two-hand operation control valve 1 has two main input ports 11a for individually connecting the two 3-port manual operation valves 2a and 2b to the valve body 10. , l ib. These main input ports 11a and l ib are arranged side by side at a position near one half on one side of the substantially rectangular parallelepiped valve body 10 as shown in FIGS. Pipe fitting 15 is installed.

Furthermore, the other piece of the side surface of the valve body 10 provided with the main input ports 11a, l ib As shown in FIGS. 2 and 4, the main output port 12 that outputs the signal pressure (pneumatic pressure) to the switching valve 8 of the fluid pressure drive device 5 and the switching valve 8 are supplied to the position near the half. The exhaust port 13 that discharges the air pressure that has been arranged is arranged side by side, and a ventilation port 14 that communicates with a residual pressure discharge port 23c of a main switching valve 23 described later is opened.

[0015] The main output port 12 has a pilot flow to the switching valve 8 of the fluid pressure drive device 5 when compressed air is supplied to both the main input ports 11a and l ib almost simultaneously from both the manually operated valves 2a and 2b. Air pressure is output as body pressure, and the exhaust port 13 is not supplied with compressed air from at least one of the two manually operated valves 2a, 2b to the main input port, that is, both the main input ports 11a, l When ib is not supplied with compressed air, it is supplied to the switching valve 8 to discharge the air pressure.

[0016] The configuration of the two-hand operation control valve 1 itself will be described more specifically. First, as shown in Figs. 1 and 3, the valve body 10 has the two main input ports 11a, l ib By connecting the pair of input ports 20a, 20a of the AND valve 20 and the pair of input ports 21a, 21a of the shuttle valve (or valve) 21 to the pair of flow paths leading to the AND valve 20, respectively, the AND valve 20 and the shuttle valve 21 are connected. Are connected in parallel between the two main input ports 11a and l ib. The AND valve 20 outputs the compressed air as an AND output when the compressed air is input to both of the pair of input ports 20a (FIGS. 1 and 5). On the other hand, when the compressed air is input to at least one of the pair of input ports 21a, the shuttle valve 21 outputs the compressed air that is also input to the output port 21b (Figs. 1 and 6). Output as OR output.

[0017] The AND valve 20 and the shuttle valve 21 are respectively connected to the main input ports 11a and l ib connected to the manual operation valves 2a and 2b on one side of the valve body 10 with their respective axis lines. The ports 11a and l ib are arranged in parallel in the arrangement direction of the ports, that is, in the vertical direction in the figure, and they are communicated with the flow path leading to the main input ports 11a and l ib. More specifically, the valve force of the upper surface of the valve body 10 is also drilled at positions behind the main input ports 11a and ib, and the valve mechanisms of the AND valve 20 and the shuttle valve 21 are accommodated in these valve holes. And the input ports 20a and 21a in the AND valve 20 and the shuttle valve 21 and the main input port 1 The connection with la and l ib is performed by communicating the holes drilled in the inside of the main input ports 11a and l ib with the valve holes of the AND valve 20 and the shuttle valve 21.

[0018] The output port 20b of the AND valve 20 is connected to the valve input port 23a of the main switching valve 23 as shown in FIGS. 1 and 5, while the output port 21b of the shuttle valve 21 is connected to the valve input port 23a. As shown in FIG. 1 and FIG. 6, the throttle 26 and the check valve 27 are connected in the tank 30 on the valve body 10 via the flow control element 25 connected in parallel.

The capacity of the tank 30 is determined by the time force until the internal pressure becomes a constant pressure by the compressed air flowing into the tank through the flow rate control element 25, and the allowance for the operation of the two manually operated valves 2a and 2b by both hands. The pressure in the tank 30 is set as shown in FIGS. 1, 4 and 5, and the valve member (spool Valve) 35 is driven to act on the first pressure receiving end surface 35a of the valve member 35.

The spool-type main switching valve 23 is positioned alongside the AND valve 20 behind the main output port 12 and the exhaust port 13 as shown in FIG. 4, FIG. 5, and FIG. The valve hole 36 is drilled from the upper surface of the valve body 10 so that the spool-type valve member 35 is inserted into the valve hole 36, and the internal pressure of the tank 30 on the upper surface of the valve body 10 is reduced. The valve member 35 is made to act on the pressure receiving end surface 35a at the end of the valve member 35 for driving the valve member 35. Since the valve hole 36 of the spool type main switching valve 23 is opened at the above position, the output port 20b of the AND valve 20 and the valve input port 23a of the main switching valve 23 are linearly connected as shown in FIG. Can be easily communicated.

[0020] As can be seen from Figs. 3 to 6, the tank 30 is formed by attaching a cover 31 on the valve body 10. However, since various valve holes are opened on the upper surface of the valve body 10 facing the tank 30 so as to be divided from the figure, in order to form the tank 30, the valves 30 except for a part thereof. A plate 33 for closing the hole is airtightly mounted and fixed on the upper surface of the valve body 10. In order to guide the pressure in the tank 30 to the pressure receiving end surface 35a of the valve member 35 in the main switching valve 23, a communication hole 33a is opened at a position corresponding to the valve hole 36, and the flow from the shuttle valve 21 is In order to communicate the passage to the tank 30 via a flow control element 25 including a throttle 26 and a check valve 27, the throttle 26 and the check A communication hole 33b is formed at a position corresponding to the valve 27.

As shown clearly in FIG. 7, the spool-type main switching valve 23 has a valve input port 23a in which compressed air from the AND valve 20 is supplied to the valve hole 36 (see also FIG. 5). The valve output port 23b for outputting air pressure to the switching valve 8 of the fluid pressure drive device 5 from the switch valve 23 through the main output port 12 of the valve body 10 (see also Fig. 4), and the valve input port 23a to the valve output port Residual pressure discharge port 23c (see Fig. 1 and Fig. 8) for discharging the residual pressure remaining on the valve output port 23b side when the flow path leading to 23b is closed, and the compressed air pressure of the valve output port 23b A balance pressure port 23d for acting on the second pressure receiving end surface 35b opposite to the pressure receiving end surface 35a of the member 35 is opened, and the valve member (spool) 35 sliding in the valve hole 36 is provided with Land made of a seal member that opens and closes the flow path connecting valve input port 23a and valve output port 23b 37a, and a land made of a seal member that allows the valve output port 23b to communicate with the residual pressure discharge port 23c when the flow path between the valve input port 23a and the valve output port 23b is closed by the land 37a. 37b is provided.

Further, a return spring 38 is accommodated on the pressure receiving end surface 35 b side of the valve member 35 in the valve hole 36, and its urging force is applied to the valve member 35. The urging force of the return spring 38 causes the valve member 35 to move to the tank 30 when the tank 30 is not filled with compressed air through the throttle 26 or when the pressure does not reach a certain set pressure. The valve member 35 is held at the switching position in FIG. 7 where the valve input port 23a and the valve output port 23b are communicated with each other. When the pressure accumulates exceeding the set pressure and acts on the pressure receiving end surface 35a of the valve member 35, the urging force of the return spring is overcome and the valve member 35 is pressed, and the land 37a is connected to the valve input port 23a and the valve. The valve member 35 is sized so as to be held at a position where the output port 23b is blocked. When the output pressure of the valve output port 23b is introduced to the balance pressure port 23d, the valve member 35 is naturally held at the position shown in FIG.

[0023] The valve member 35 in the spool-type main switching valve 23 is operated by balancing the axial pressure acting on the spool-type main switching valve 23, so that the seats on the pressure receiving end surfaces 35a, 35b side at both ends of the valve member 35 are provided. The diameter and the seat diameter in the lands 37a and 37b are substantially the same. Force Using the spool type main switching valve 23 having the valve member 35 thus balanced in pressure. As a result, the diameter of the valve hole 36 can be reduced compared with the case where a switching valve such as a poppet valve, which is difficult to balance pressure, is used. As a result, the valve body 10 can be reduced in size. wear. In particular, as in the case of the control valve 1 for two-handed operation, the upper surface force of the valve body 10 is also used when the valve holes of the AND valve 20, shuttle valve 21 and main switching valve 23 are drilled in parallel. The small diameter 匕 of the hole 36 is effective for reducing the size of the valve body 10.

[0024] As shown in FIG. 4, the valve output port 23b of the main switching valve 23 communicates with the main output port 12 through the exhaust flow path 42 of the quick exhaust valve 40 having a check function. When there is no output pressure at the port 23b, the main output port 12 communicates with the exhaust port 13 through the exhaust passage 42.

More specifically, the exhaust valve member 41 in the quick exhaust valve 40 is formed of a rubber elastic member, has a fin-like check function part 41a around it, and has sheet parts 41b and 41c on both sides, These seat portions 41b, 41c force Exhaust valve seat 43 located inside the exhaust port 13, and outlet valve seat located outside the valve output port 23b of the main switching valve 23 and facing the exhaust valve seat 43 I started to come in contact with 44.

Therefore, when there is an output pressure at the valve output port 23b of the main switching valve 23, the exhaust valve member 41 is pressed against the exhaust valve seat 43 side, and the seat portion 41b is connected to the valve seat. 43 is closed, and the output of the valve output port 23b presses the check function part 41a around the exhaust valve member 41 and flows out there, and is output to the main output port 12 through the exhaust passage 42. Further, when compressed air exists on the main output port 12 side where the output pressure is applied to the valve output port 23b, the exhaust valve member 41 is pressed against the outlet valve seat 44 side by the pressure, and the exhaust valve seat 43 At the same time, the outlet valve seat 44 is closed by the seat portion 41c of the exhaust valve member 41. As a result, the compressed air of the main output port 12 passes through the exhaust passage 42 and the exhaust port 13 Is exhausted quickly.

[0026] This two-hand control valve 1 is a main output port 12 that immediately stops the fluid pressure drive device 5 or puts it in a safe state when the operator releases at least one manual operation valve force hand. It is necessary to quickly exhaust the compressed air that is output from the exhaust port, but since the exhaust port 13 is provided in the positional relationship described above, it can be increased in diameter. The valve body 10 does not increase in size. Next, the operation of the two-hand operation control valve 1 having the above configuration will be described.

In the above-described two-hand control valve 1, when the manual operation valve 2a or 2b on one side in FIG. 1 is pressed, the compressed air from the air pressure source 3 is supplied to the main input port 11a or l ib force and valve of the valve body 10. 20 and the input ports 20a and 21a of the shuttle valve 21. When only one manual operation valve 2a or 2b is pressed, there is no output from the AND valve 20, but there is output from the output port 21b of the shuttle valve 21, which flows into the tank 30 via the throttle 26. Accumulated there. The diameter of the throttle 26 and the capacity of the tank 30 are adjusted so that the pressure inside the tank becomes a set pressure applied to the pressure receiving end surface 35a of the valve member 35 of the spool type main switching valve 23 in about 0.5 seconds. ! Speak.

[0028] If the other manually operated valve 2b or 2a is pushed before the internal pressure of the tank 30 reaches the set pressure, compressed air flows into both the input ports 20a of the AND valve 20. Since an output is generated at the output port 20b, it reaches the valve input port 23a of the main switching valve 23, and at this time, the internal pressure of the tank 30 does not reach the set pressure. In the switching position shown in FIG. 7, that is, in the switching state where the valve input port 23a of the switching valve 23 communicates with the valve output port 23b, the compressed air output to the valve output port 23b is Then, the check function portion 41a around the exhaust valve member 41 of the quick exhaust valve 40 is pushed open to flow out, and is output to the main output port 12 through the exhaust flow path 42, which is sent to the fluid pressure drive device 5.

[0029] The output from the shuttle valve 21 is accumulated in the tank 30 through the throttle 26, and even if it reaches the set pressure, the compressed air reaches the valve output port 23b from the valve input port 23a of the main switching valve 23. Then, it flows into the balance pressure port 23d and acts on the pressure receiving end face 35b of the valve member 35, so that the valve member 35 is not switched by the pressure in the tank 30.

[0030] When the other manual operation valve is pressed until the internal pressure of the tank 30 reaches the set pressure, the internal pressure of the tank 30 is the pressure receiving end face 3 in the valve member 35 of the main switching valve 23. 5a, the biasing force overcomes the biasing force of the return spring 38 at the other end of the valve member 35 to switch the valve member 35, and the valve input port 23a and the valve output port 23b of the switching valve 23 communicate with each other. Is switched to the shut-off state. Compressed air is not output to the fluid pressure drive device 5 through the valve 23.

[0031] Further, when the compressed air is supplied to the fluid pressure drive device 5 by pushing both the manual operation valves 2a and 2b, it is possible to release at least one manual operation valve force. When released, the output from the AND valve 20 disappears, so that the pressure acting on the pressure receiving end surface 35b of the valve member 35 via the balance pressure port 23d of the spool type main switching valve 23 decreases, and the force is also reduced at that time. Then, since sufficient pressure is accumulated in the tank 30, the valve member 35 of the main switching valve 23 is switched, and the communication between the valve input port 23a and the valve output port 23b in the switching valve 23 is cut off. Is done.

[0032] Note that when both hands are released from the manual operation valves 2a and 2b, the compressed air from the air pressure source 3 is shut off at those valves, while the compressed air accumulated in the tank 30 is checked. It is discharged from one of the manually operated valves 2a and 2b via the valve 27 and the shuttle valve 21.

Claims

The scope of the claims

[1] Two manually operated valves (2a, 2b) operated by the left and right hands are connected to the two main input ports (l la, l lb) of the valve body (10), respectively. 2a, 2b) is operated within a certain period of time, based on the output of these manually operated valves (2a, 2b), from the main output port (12) of the valve body (10) to the fluid pressure drive device ( 5) A control valve for two-hand operation that outputs air pressure to (1),

A pair of input ports (20 &, 20 & 721 &, 21 &) are connected to the two main input ports (l la, l lb) inside the valve body (10). The AND valve (20) and shuttle valve (21) connected between (11 &, 11b) and the valve input port (23a) are connected to the output port (20b) of the AND valve (20) and the valve output. The port (23b) is connected via the throttle (26) to the main switching valve (23) connected to the main output port (12) and the output port (21b) of the shuttle valve (21). A tank (30), and the capacity of the tank (30) is adjusted to the time force until the tank internal pressure becomes a constant set pressure by the compressed air flowing in through the throttle (26). 2a) and 2b), and the pressure in the tank (30) is applied to the valve member (35) of the main switching valve (23). In the two-hand control valve (1), the communication between the valve input port (23a) and the valve output port (23b) of the main switching valve (23) is interrupted by the set pressure.

A cover (31) for forming the tank (30) is airtightly fixed to the upper surface of the valve body (10), and the AND valve (20), Each valve hole (36) of the shuttle valve (21) and the main switching valve (23) is opened, and a plate (33) for closing the valve hole (36) is airtight on the upper surface of the valve body (10). A communication hole (33a) for guiding the pressure in the tank (30) to the first pressure receiving end surface (35a) of the valve member (35) in the main switching valve (23), and A communication hole (33b) was formed to connect the flow path from the shuttle valve (21) to the tank (30) through the throttle (26).

A control valve for two-handed operation characterized by that.

[2] The main switching valve (23) is a spool valve,

Compressed air from the AND valve (20) is supplied to the valve hole (36) of the main switching valve (23), and this switching valve force is compressed to the main output port (12). Output air The valve output port (23b) and a balance that causes the compressed air pressure of the valve output port (23b) to act on the second pressure receiving end surface (35b) on the opposite side of the first pressure receiving end surface (35a) of the valve member (35). Open a pressure port (2 3d),

A spool type valve member (35) that slides in the valve hole (36) is provided with a land (37a) that opens and closes a flow path connecting the valve input port (23a) and the valve output port (23b). ,

When the return spring (38) is accommodated on the second pressure receiving end face (35b) side of the valve member (35) in the valve hole (36) and the pressure in the tank (30) does not reach the set value, The return spring (38) moves the valve member (35) toward the tank (30), thereby switching the valve member (35) between the valve input port (23a) and the valve output port (23b). When the pressure exceeds the set pressure in the tank (30) and accumulates in the tank (30) and acts on the first pressure receiving end surface (35a) of the valve member (35), the return spring (38 ), The valve member (35) is pressed, and the valve member (35) is held at a switching position that blocks the flow path connecting the valve input port (23a) and the valve output port (23b). It was to so,

The control valve for two-hand operation according to claim 1, wherein

[3] The valve member (35) in the spool-type main switching valve (23) has pressure receiving end faces (35a,

The seat diameter of the peripheral surface of 35b) and the seat diameter of the land (37a) are made substantially the same, and the axial pressure acting on the valve member (35) is balanced,

The control valve for two-hand operation according to claim 2, wherein

[4] The two main input ports (l la, l lb) are arranged side by side vertically at a position near one half of one side of the valve body (10) having a substantially rectangular parallelepiped shape. The main output port (12) and the exhaust port (13) for discharging the air pressure from the main output port (12) are arranged side by side in a position near the other half,

The AND valve (20) and shuttle valve (21) are placed behind the main input port (l la, l lb), and they are connected to the flow path leading to the main input port (1 la, 1 lb). Communicate

The main switching valve (23) is located behind the main output port (12) and the exhaust port (13).

V, arranged so as to be aligned with the TE AND VALVE (20),

The control valve for two-hand operation according to claim 1 or 2, wherein

[5] Quick exhaust valve (40) with check function connected to valve output port (23b) of main switching valve (23) To the main output port (12) through the exhaust passage of

The exhaust valve member (41) in the quick exhaust valve (40) is formed of a rubber elastic member, and a check function part (41a) is provided around the exhaust valve member (41). The exhaust valve seat (43) leading to the exhaust port (13) and the outlet valve seat (44) leading to the valve output port (23b) of the main switching valve (23) are connected to and separated from both end faces of 41). Provide seat parts (41b, 41c)

When there is an output pressure at the valve output port (23b) of the main switching valve (23), the exhaust valve member (41) is pressed against the exhaust valve seat (43) and one of the seat portions (41b) The exhaust valve seat (43) is closed, the output of the valve output port (23b) flows out through the check function section (41a), and is output to the main output port (12) through the exhaust flow path (42). ,

When there is no output pressure at the valve output port (23b), the exhaust valve member (41) is pressed against the outlet valve seat (44) side, the exhaust valve seat (43) is opened, and the main output port ( The compressed air of 12) was quickly exhausted from the exhaust port (13) through the exhaust passage (42).

The control valve for two-hand operation according to claim 1 or 2, wherein