JP2518050Y2 - Safety solenoid valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in pneumatic equipment for actuating actuating members and the like of various machines by means of an air actuator, and when the pressure on the exhaust side of the air actuator is below a predetermined pressure (eg atmospheric pressure). The present invention relates to a safety solenoid valve for preventing a runaway and for removing the residual pressure of the air actuator after stopping the air supply to the air actuator.

[0002]

2. Description of the Related Art Since the pressure on the exhaust side of an air actuator after the air supply has been stopped for a long time or the residual pressure has been removed is below a predetermined pressure (for example, atmospheric pressure), the air is supplied to operate the air actuator. Then, the piston etc. may jump out and run out of control. As a countermeasure against this, conventionally, a pressure center type three-position valve has been used as a main switching valve (main valve) to start air after air is once supplied to an air actuator, or to perform meter-in control.
When a person involved in maintenance operates the air equipment for repair of the air equipment, inspection for maintenance, inspection after emergency stop, etc., the air (compressed gas) trapped in the air actuator after the air supply is stopped ) Caused the air actuator to operate, resulting in a personal injury. As a measure against this, conventionally, a residual pressure relief valve was installed in the main air circuit, and after the air supply was stopped, the residual pressure relief valve was operated to open the air in the main air circuit to the atmosphere and remove the residual pressure. Was. (For the conventional technology for preventing pop-out and residual pressure removal, please refer to February 25, 1989, Ohmsha Co.
(See pages 9-440)

In the conventional pop-out prevention technology, a pressure center type three-position valve can be used as a main switching valve only in special cases, and when meter-in control is used to prevent pop-out, other controls are limited. This makes it difficult to achieve the desired operation. Further, since the conventional residual pressure removing technology only removes the residual pressure in the main air circuit, if a closed center type switching valve in which ports A and B are blocked at the central position is used as the main switching valve, Even if the residual pressure in the main pneumatic circuit is removed, there is residual pressure in the air actuator. The applicable range of the conventional residual pressure removal technology is limited. As described above, the conventional pop-out prevention technology and residual pressure removal technology have a drawback that their application range is extremely limited and their utility value is low. Further, the pop-out prevention technology and the residual pressure removal technology are separate technologies that are not related to each other, and if both technologies are applied, the number of parts will increase accordingly.

[0004]

The safety solenoid valve of the present invention eliminates the above-mentioned drawbacks of the prior art, and can be applied to any pneumatic equipment using an air actuator, and prevents the main switching valve from popping out and residual pressure. The task is to have both functions of removal.

[0005]

The present invention achieves the above object.
In order to implement the safety solenoid valve of 4 port or 5 port
Fixed sleeve(3)Movable sleeve inside(Four)Is sliding itself
Movable land(6,7)With spool(Five)
Movable sleeve(Four)It is slidably inserted in the spool
(Five)Has 3 stoppers(10 ~ 12)Is provided and 3
Stopper(10 ~ 12)Movable land between each
(6,7)The movable land(6,7)Shift shift
The(13,14)Oppressed byThe fixing sleeve (3) has a number
The first through the fifth through holes are sequentially formed, and the movable sleeve
The sixth through tenth holes are sequentially formed in (4),
The spool (5) is in the center position and the movable sleeve (4) is in the rear end position.
When air is supplied to the P port, the movable land
(6,7) moves against the resilience of the shift springs (13,14).
It is moved into contact with any of the stoppers (10-12).
The movable lands (6, 7) open the 7th and 8th through holes,
Air can pass through P port, 3rd through hole, 7th and 8th through hole
Enter into the moving sleeve, and from the inside of the moving sleeve to the 7th through hole and
The flow rate is adjusted by 2 through holes and flows to the A port.
The flow rate from the inside of the movable sleeve to the 8th through hole and the 3rd through hole
Adjusted to flow to port B, spool (5) in middle position
The movable sleeve (4) is at the front end and the P port is large.
The movable lands (6, 7) shift shift when communicating with each other.
(13,14) was moved by the resilience of the ring (13,14) and left behind.
The movable lands (6, 7) are in contact with the par and the 7th through hole and 9th through hole
Open the hole so that A port and B port communicate with R port.
AndTo have at least 4 positionsTo configure
Do. In interpreting the present invention, consider the following matters.
You must be careful.  In the present invention, the term air (compressed air)
All gases with the specified pressure (including air and nitrogen gas)
Mu. ), And supplies to the main switching valve (main valve)
The air source and the air source for moving the movable sleeve are the same.
Or it may be another.  In the present invention, the operation method of the safety solenoid valve is
Type, electromagnetic air pilot type as well as mechanical type and manual type
And all other operating means.  In the present invention, the operating position of the spool of the safety solenoid valve
Is only the center position, front end position, rear end position
No, it can take any position in the middle of the three positions,
Proportional control to position the spool etc. in proportion to the input signal
It is possible.  The safety solenoid valve of the present invention is a sub plate (manifold
Of course, it can be configured to be connected to
You.

[0006]

[Action] When the variable dynamic sleeve is in the forward position, the air in the P port of the safety solenoid valve is supplied, the movable land is moved against the elastic force of the shift spring, the normal selector valve (e.g. closed It acts as a center type. When the air supply to the P port of the safety solenoid valve is stopped, the movable land is moved to the residual pressure removal position by the elastic force of the shift spring, and the two ports connected to the air actuator are connected to the atmosphere. Residual pressure is removed. When air is supplied to the P port of the safety solenoid valve when the movable sleeve is at the rear end position, the movable land moves against the elastic force of the shift spring, and becomes the pop-out prevention position. At this time, air is communicated to the A port and B port is communicated with the air actuator via the Ri diaphragm, air is gradually supplied to the air actuator.

[0007]

1 to 3 show a safety solenoid valve 1 of a first embodiment of the present invention, and FIG. 4 is a circuit diagram to which the safety solenoid valve 1 of the first embodiment is applied. A fixed sleeve 3 is disposed and fixed in a central hole bored in the axial direction of a body 2 (one in which a plurality of blocks are connected) of the safety solenoid valve 1, and a movable sleeve 4 is slidable in the fixed sleeve 3. And the spool 5 having the first movable land 6 and the second movable land 7 is slidably inserted into the movable sleeve 4. A stepped piston chamber 16 is formed in front of the fixed sleeve 3 (on the left side in FIG. 1).
An annular piston formed outside the front part of the movable sleeve 4.
15 is slidably fitted in the piston chamber 16. A spring 17 is arranged between the rear end surface (the right end surface in FIG. 1) of the annular piston 15 of the movable sleeve 4 and the front end surface (the left end surface in FIG. 1) of the fixed sleeve 3.
Suppress the forward. A on one side of body 2 (upper side in FIG. 1)
Port and B port are opened in order from the front of the body 2,
PL port, RA port on the other side of the body 2 (lower side in Fig. 1),
The P port and the RB port are opened sequentially from the front of the body 2. The spool 5 has a first land 8, a first stopper 11, a first rod 18, a central stopper 10, and a second rod in order from the front.
19, the second stopper 12, and the second land 9 are continuously provided. First
The first movable land 6 and the second movable land 7 are slidably inserted into the rod 18 and the second rod 19, respectively. First
Between the land 8 and the first movable land 6 and between the second movable land 7
The first shift spring 13 is provided between the second lands 9 respectively.
And a second shift spring 14 are arranged to elastically press the first movable land 6 and the second movable land 7 toward the central stopper 10, respectively. The fixing sleeve 3 is provided with five through holes, and the first through hole, the second through hole, the third through hole (a wide annular groove is formed inside), and the fourth through hole in order from the front. It is called a fifth through hole. The first through hole of the fixed sleeve 3 is in communication with the RA port, the second through hole is in communication with the A port, and the third through hole is P
The fourth communication hole is communicated with the B port, and the fifth communication hole is communicated with the RB port. The movable sleeve 4 is provided with five through holes, and a sixth through hole, a seventh through hole (a slightly wide annular groove is formed on the outside) and an eighth through hole (a wide outside on the outside) in order from the front. An annular groove is formed), the ninth through hole,
Called 10 through holes. In the state shown in FIG. 1 in which the movable sleeve 4 is in the front end position (the left end position in FIG. 1) and the spool is in the center position, the first through hole and the sixth through hole are in opposite positions, and the second through hole is also the same. Through hole and seventh through hole, third through hole and eighth through hole,
The 4th through hole and the 9th through hole, and the 5th through hole and the 10th through hole are located at opposing positions, respectively. A double solenoid 20 is arranged at the rear end of the body 2, and according to an input signal to the double solenoid 20,
The spool 5 is moved. PL opening to the other side of body 2
The port communicates with the front end of the piston chamber 16. Body 1
An air vent 21 is formed in the front end wall of the piston, and the rear end of the piston chamber 16 communicates with the atmosphere via the air vent 22. As shown in FIG. 5, the A port of the safety solenoid valve 1 communicates with the head side of the air cylinder 26, the B port communicates with the rod side of the air cylinder 26, the RA port / RB port communicates with the atmosphere, and the P port
The port communicates with the original valve 27.

Next, the operation of the safety solenoid valve 1 of the first embodiment will be described. In the state shown in FIG. 1, the PL port is in communication with the atmosphere, the movable sleeve 4 is elastically pressed by the spring 17 and is in the front end position, the double solenoid valves 20 are all non-energized, and the spool 5 is in the center position. is there. Then, the main valve 27 is at the position I, air is supplied to the P port at a predetermined pressure or more, and the first movable land 6 and the second movable land 7 are connected to the first shift spring 13 and the second shift spring 14. Moved against the resilience, the first stopper 11
And the second stopper 12, respectively. Here, the position when the movable sleeve 4 is at the front end position and the spool 5 is at the center position is referred to as a position, and the position is the position of the original valve.
The position when 27 is at position II will be referred to as position I (see FIG. 5). At this time, the first movable land 6
The second movable land 7 closes the seventh through hole and the ninth through hole, respectively, and the A port, B port, RA port, P port,
All RB ports are blocked. In the state shown in FIG. 1 (position I in FIG. 5), when one solenoid of the double solenoid 20 is energized, the spool 5 moves to the front end position (left end position in FIG. 1; position I in FIG. 5). ), The air is in the P port, the third through hole,
The air on the rod side of the air cylinder 26 flows through the eighth through hole, the seventh through hole, the second through hole, and the A port, and the air on the rod side of the air cylinder 26 passes through the B port, the fourth through hole, and the ninth through hole. It is discharged to the atmosphere through the hole, the 10th through hole, the 5th through hole, and the RB port. On the contrary, when the other solenoid of the double solenoid 20 is energized, the spool 5 is switched to the rear end position (the right end position in FIG. 1, position I in FIG. 5), and the air is supplied to the P port, the third through hole,
The air on the head side of the air cylinder 26 passes through the eighth through hole, the ninth through hole, the fourth through hole, and the B port, and the air on the head side of the air cylinder 26 passes through the A port, the second through hole, and the seventh through hole. It is discharged to the atmosphere through the hole, the sixth through hole, the first through hole, and the RA port. As described above, when the movable sleeve 4 is at the front end position, a normal operation as a main switching valve occurs. During an emergency stop,
All the double solenoids 20 are de-energized, the spool 5 is at the center position, the PL port is in communication with the atmosphere,
The movable sleeve 4 comes to the front end position (position), the original valve 27 is further switched to the position II, the P port is communicated with the atmosphere, and the P port pressure becomes equal to or lower than a predetermined pressure, and the first movable land 6 and the second movable land are moved. The land 7 is moved by the elastic force of the first shift spring 13 and the second shift spring 14, and is switched to a position (a residual pressure removing position shown in FIG. 3; position II in FIG. 5) in which it comes into contact with the central stopper 10. The A port is communicated with the atmosphere through the second through hole, the seventh through hole, the sixth through hole, the first through hole, and the RA port, and similarly, the B port is similarly connected through the fourth through hole, the ninth through hole, and the tenth through hole. The residual pressure on both sides of the air cylinder 26 is removed by communicating with the atmosphere through the through hole, the fifth through hole, and the RB port.

In the state shown in FIG. 1 (position I in FIG. 5), when air flows into the piston chamber 16 through the PL port, the movable sleeve 4 is moved against the elastic force of the spring 17, and the rear end position is reached. (The pop-out prevention position shown in FIG. 2; position I in FIG. 5). The flow rate of air from the P port is adjusted by the third through hole and the seventh through hole.
The flow rate is adjusted by the through hole and the second through hole, flows into the head side of the air cylinder 26 through the A port, and is similarly adjusted by the third through hole and the eighth through hole from the P port. The flow rate is adjusted by the eight through holes and the fourth through hole, and flows into the rod side of the air cylinder 26 through the B port. In this way, the air is supplied to both sides of the air cylinder 26 with the flow rate adjusted and gradually supplied, so that the air actuator is prevented from popping out.

FIG. 4 shows a safety solenoid valve 23 according to a second embodiment of the present invention.
Represents In the second embodiment, the air for moving the movable sleeve 4 is not controlled by an external operating valve, but is controlled by an auxiliary switching valve 24 arranged near the piston chamber 16. Then, the operating air is supplied from the P port to the auxiliary switching valve 24 through the passage 25. Since the other points are the same as those of the safety solenoid valve 1 of the first embodiment, the same reference numerals as those of the first embodiment are used for the common parts, and the description of the common parts is omitted.

[0011]

[Effect of the invention] variable dynamic sleeve when in the front end position, as a normal change-over valve, also functions as a pressure eliminator. When air is supplied to the P port of the safety solenoid valve when the movable sleeve is at the rear end position, the movable land moves against the elastic force of the shift spring, and the air actuator moves through the throttle. Air is gradually supplied to the cylinder to prevent it from popping out. The safety solenoid valve of the present invention has a main switching valve having both functions of preventing popping out and removing residual pressure, and can be applied to any pneumatic equipment using an air actuator. Moreover, if this safety solenoid valve is used as a main switching valve, the functions of preventing pop-out and residual pressure are generated without separately providing a pop-out prevention valve and a residual pressure relief valve. It is also useful for downsizing and cost reduction.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a safety solenoid valve (in a normal state) according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a safety solenoid valve (at a pop-out prevention position) according to a first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a safety solenoid valve (at a residual pressure removing position) according to the first embodiment of the present invention.

FIG. 4 is a vertical sectional view of a safety solenoid valve according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram to which the safety solenoid valve of the present invention is applied.

[Explanation of symbols]

 1 safety solenoid valve 3 fixed sleeve 4 movable sleeve 5 spool 6 first movable land 7 second movable land 10 central stopper 11 first stopper 12 second stopper 13 first shift spring 14 second shift spring 23 safety solenoid valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-134205 (JP, A) Actual Kaihei 1-144501 (JP, U) Actual public 55-26616 (JP, Y2) Actual public 2- 10324 (JP, Y2) Jikkyohei 3-8801 (JP, Y2)

Claims (1)

(57) [Scope of utility model registration request] 1. A movable sleeve is slidably fitted in a fixed sleeve, a spool having a movable land is slidably inserted in the movable sleeve, and three stoppers are arranged on the spool. A movable land is disposed between each of the stoppers, the movable land is elastically pressed by the shift spring, and the fixed sleeve has the first through hole or the first through hole.
5 through holes are sequentially formed, and the movable sleeve has no 6th through hole.
The 10th through hole is formed in sequence, and the spool is in the center position.
With the movable sleeve at the rear end position, air is supplied to the P port.
When supplied, the movable land will give the elastic force of the shift spring.
Is moved against and comes into contact with any of the stoppers.
The movable land opens the 7th and 8th through holes,
Movable pick-through through P port, 3rd through hole, 7th and 8th through hole
And the second through hole from inside the movable sleeve.
Flow rate is adjusted by and flows to port A and is movable
Adjust the flow rate from inside the sleeve with the 8th through hole and the 3rd through hole.
Flow to port B, and the spool moves at the center position.
Reeve is at the front end position and P port communicates with the atmosphere
At this time, the movable land is moved by the elastic force of the shift spring.
The movable land comes into contact with the stopper that has been moved and left.
The 7th and 9th holes are opened, and A port and B port
A 4-port or 5-port safety solenoid valve that communicates with the R port and has at least 5 positions.