JP2534946B2 - Solenoid switching valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switching valve for switching a working fluid such as a cylinder device.

[0002]

2. Description of the Related Art Referring to FIG.
Is used in the release mechanism 6 of the roller feeder 3 (upper roller 4, lower roller 5) that supplies the coil material W to the press machine 1, and the working fluid (pressurized air) of the driving cylinder device 10 is used. Served to switch.

That is, the electromagnetic switching valve 200 has a first port 201, a second port 202, and a third port 202 which are connected to the pressurized air source 15.
It has a port 203 and a fourth port 204, and when the solenoid S1 is excited to switch to the port P1, the first port 201 and the second port 20.
2 communicates with each other, and the third port 203 and the fourth port 204 communicate with each other. On the other hand, by exciting the solenoid S2, the port P
When switched to 3, the first port 201 and the third port 203 and the second port and the fourth port are communicated. The port P2 is neutral.

A cylinder device 10 connected to the electromagnetic switching valve 200 by pipes 16 and 17 is equipped with a cylinder 11 having one port 11A and another port 11B, and an airtight and slidable mount in the cylinder 11. And a piston rod 13 integral with the piston 12. If pressurized air is supplied to the one port 11A from the R1 direction and discharged from the other port 11B in the R2 direction, the piston rod 13 can be projected to the right in FIG. 4, and the other port 11B can be pressurized from the R21 direction. Is supplied and discharged from the one-way opening 11A in the direction of R11.
3 can be pulled back to the left.

The release mechanism 6 adjusts the position of the material W by inserting the pilot pin 2 into the guide hole of the material W fed into the press machine 1 and adjusting the position of the material W.
It is a means for ensuring the degree of freedom in the feeding direction of the material W by releasing (releasing) from. Specifically, it includes a pair of link bars 7 and 8 rotatably supported on the tip of the piston rod 13 at a fulcrum 9, and the fulcrum 9 can be released by pulling the fulcrum 9 leftward in the drawing.

Therefore, before inserting the pilot pin 2, the solenoid S2 is excited to switch the electromagnetic switching valve 200 to the port P3. Then, the pressurized air from the third port is supplied to the other port 11B from the R21 direction,
In addition, the air in the cylinder 11 is discharged from the one port 11A in the R11 direction. As a result, the piston rod 13 has a fulcrum 9
Can be released to the left by pulling the roller feeder 3 (4,5). On the other hand, when the solenoid S1 is excited, the port P1
When switched to, the pressurized air is supplied to the one port 11A from the R1 direction, and the air is discharged from the other port 11B in the R2 direction, so that the lower roller 5 is pressed against the upper roller 4.

Here, an example of the conventional structure of the electromagnetic switching valve 200 will be described in detail with reference to FIG.

In the figure, the main chamber 2 of the bonnet 210
A main spool 211 and a plurality of collars 213 having packings 212 are arranged in 10S, and by moving and displacing the main spool 211 in the horizontal direction in the figure,
The communication state of each port 201, 202, 203, 204 is formed so as to be switchable as described above.

The solenoid S1 (S2) is a fixed core 21.
4, the movable core 215, and the coil 216. The movable core 215 is constantly urged downward by a spring 217. When the coil 216 is energized, its lower end 215A is urged upward so as to open the control air passage 218.

Reference numeral 219 denotes a sub spool, which is a spring 2 in a normal state.
The switching air passage 221 communicating with the main chamber 210S is closed at 20. In addition, when the lower end portion 215A of the movable core 215 moves upward, the control air passage 218
And the switching air passage 221 are communicated with each other. Pressurized air (control air) is supplied to the control air passage 218 through the first port 201. In addition, 222 is a sub-base, and 223 is a cover assembly.

Therefore, the main spool 211 is shown in FIG.
Then, the first port 201 and the second port 202 are communicated with each other and the third port 203 and the fourth port 204 are communicated with each other. That is, in order to supply the pressurized air to the one port 11A of FIG. 4 and discharge the air in the cylinder 11 from the other port 11B, the solenoid S1 may be excited.

First, the electromagnetic attraction force of the coil 216 moves the movable core 215 upward, and the lower end portion 215A of the movable core 215 opens the control air passage 218. Then, sub spool 2
19 guides the control air to the switching air passage 221 and the main chamber left side 210SA against the biasing force of the spring 220. Therefore, since the large-diameter end surface 211A of the main spool 211 is pushed, the main spool 211 has the opposite end surface 221B on the right side 21 of the main chamber.
The air in the 0SB is pushed through the fixed core 214.
Therefore, the main spool 211 moves to the state shown in FIG. 5, and the electromagnetic switching valve 200 switches to the communication state.

Thus, when the switching operation is completed, the pressurized air supplied from the pressurized air source 15 through the first port 201 passes through the second port 202 and the pipe 16 from the R1 direction as shown in FIG. It is fed into the cylinder 11 (one-sided opening 11A). Further, the air in the cylinder 11 is supplied to the other port 11B,
Flows in the R2 direction through the pipe 17, and the third port 203, the fourth
It is released to the atmosphere through the mouth 204.

That is, the releasing action of the air in the cylinder 11 progresses and the charging action is promoted accordingly, and the piston 12 moves from the solid line state in FIG. 4 to the dotted line state for the first time. When the solenoid S2 is excited, the main spool 21
1 moves in the opposite direction, resulting in cylinder rod 13
Can release the release mechanism 6.

[0015]

According to such a conventional structure, as described in detail above, the sub-spool 219 is switched air passage 221 based on the time when the movable core 215 is moved and displaced by exciting the solenoid S1 (S2). There is a big time lag (for example, 1/50 sec) before opening
Also, it takes a large time lag (for example, 3/1) until the main spool 211 is moved to a predetermined position by the switching air.
00 sec) is inevitably required. Further, regarding the latter, the large diameter end surface 211A (21
In 1B), the air in the main chamber 210SA (210SB) must be pushed out to the outside, and the frictional force also increases depending on the number of collars 213 (packings 212) arranged, which further increases the time lag.

Therefore, for example, the release mechanism 6 is used.
When used in the driving cylinder device 10 of FIG. 4, the SPM of the press machine 1 shown in FIG.
When it is required to set the release time of 2/100 sec or less, the electromagnetic switching valve 200 cannot be applied due to its structure. Therefore, although the crankshaft of the press machine 1 and the release mechanism 6 are synchronously operated via the cam mechanism, the link mechanism, the gear mechanism, etc., the structure is complicated and the size is large and the cost is very high.

Further, since the second port 202 and the third port 203 act as a pair for supplying and discharging, the operation time thereof is long and the piping to the cylinder device 10 etc. becomes complicated.

In other words, if an electromagnetic switching valve capable of high-speed response is developed, the cost of, for example, any industrial machine that switches loads such as cylinder devices can be drastically reduced.
The miniaturization and easy handling can be remarkably improved.

An object of the present invention is to provide an electromagnetic switching valve which can dramatically speed up switching response and is small in size and low in cost.

[0020]

SUMMARY OF THE INVENTION In the present invention, the conventional problems described above are caused by a time lag based on mechanical factors such as movement of the sub spool and the main spool, and simultaneous supply / discharge of the second and third ports. However, it is analyzed that it is based on separate and independent operation, and it is possible to generate negative pressure by utilizing the energy of the essential working fluid, that is, the nozzle flow,
It is intended to achieve the above object by adopting a configuration capable of performing a valve switching operation at a high speed corresponding to an electrical switching speed of a solenoid, which eliminates a time lag due to a mechanical factor.

That is, according to the present invention, the nozzle, the air supply port arranged on the inlet side of the nozzle, the exhaust port arranged on the outlet side, and the portion where negative pressure is generated by the nozzle flow action are connected. Negative pressure generating means having an operating port, a sealing member that is held so as to be able to move away from and close to the exhaust port and that can seal the exhaust port in the approach state, an electromagnetic solenoid that biases in one direction, and the like. An electromagnetic switching valve including a spring urging in a direction, and a drive unit configured to reciprocally drive the sealing member in a direction of sealing and opening the exhaust port.

[0022]

In the present invention having the above-described structure, for example, when the cylinder device is driven, the working port of the negative pressure generating means is connected to one port or the other port of the cylinder. Now, when the drive means is configured to seal the exhaust port with the electromagnetic solenoid in the non-excited state, the pressurized air supplied to the exhaust port is directly supplied from the operating port to one port of the cylinder device. It Therefore, the piston can be driven in one direction with positive pressure. Next, when the electromagnetic solenoid is excited, the sealing member opens the exhaust port. Then, the working flow becomes negative pressure due to the nozzle flow action. Therefore, the air in the cylinder is sucked through the one port. That is, the cylinder device can be driven in the opposite direction. Therefore, the load can be driven at high speed by the electric switching speed of the electromagnetic solenoid. Further, the load can be reversibly operated through a single pipe connected to the operation port.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) As shown in FIG. 1, the electromagnetic switching valve (20) comprises a negative pressure generating means 30, a sealing member 40, and a driving means 50, and the release mechanism 6 shown in FIG. It is supposed to be used for switching the working fluid (pressurized air) of the drive cylinder device 10.

First, the negative pressure generating means 30 has a chamber 31 containing a nozzle 35, an air supply port 32 arranged on the inlet side of the nozzle 35, and an exhaust port 33 arranged on the outlet side.
And an operating port 34 connected to a portion where a negative pressure is generated by the nozzle flow action, and when pressurized air is supplied to the air supply port 32 with the exhaust port 33 opened, a negative pressure is applied to the operating port 34. It is configured to be able to generate pressure. on the other hand,
When the exhaust port 33 is sealed, the pressurized air supplied from the air supply port 32 is directly supplied from the operating port 34 through the single pipe 18 to the one port 11 of the cylinder device 10 (cylinder 11).
Can supply air to A. This is because the nozzle flow action cannot be exhibited.

The nozzle 35 may be appropriately selected from a tapered nozzle or a divergent nozzle, but the working port 34 is preferably communicated with a portion having the lowest pressure (negative pressure) that can be generated by the nozzle 35.

Next, the sealing member 40 is held by the exhaust port 33 so as to be movable toward and away from the exhaust port 33, seals the exhaust port 33 in the close state, and opens in the separated state.
0). In this embodiment, it is integrally connected to a movable core 52 described later via a connecting rod 53.

The driving means 50 is composed of an electromagnetic solenoid (51, 52) for urging the sealing member 40 in one direction and a spring 54 for urging the sealing member 40 in the other direction. In this embodiment, the spring 54 urges the sealing member 40 in a direction to seal the exhaust port 33 (another direction ... downward in FIG. 1) and opens the exhaust port 33 when a current is applied to the coil 51. It is formed to urge the movable core 52 upward (in one direction). The electromagnetic solenoids (51, 52) and the spring 54 may be configured to work in opposite directions.

In the cylinder device 10, the cylinder diameter is 32 mm, the stroke of the piston 12 is 10 mm, and the other port 11B of the cylinder 11 is the atmosphere (atmospheric pressure Pa).
It is open to the public.

Next, the operation of the first embodiment will be described.
In the normal state, the sealing member 40 is the spring 54 of the driving means 50.
The exhaust port 33 is sealed by.

The pressurized air having the pressure P1 supplied from the pressurized air source 15 is filled in the chamber 31 and supplied from the working port 34 through the pipe 18 to the one port 11A. Therefore, the cylinder device 10 operates so that the pressurized air of the pressure (positive pressure) P1 supplied to the cylinder chamber 11SA is used as the working fluid to displace the piston 12 from the solid line state in FIG. 1 to the dotted line state. The air in the cylinder chamber 11SB is discharged from the other port 11B. Therefore, the fulcrum 9 is pushed to the right in FIG. 1, the lower roller 5 approaches the upper roller 4,
The material W can be fed to the press machine.

Next, when the pilot pin 2 is inserted into the guide hole of the fed material W to position the material W, the coil 51 is excited and the movable core 52 is moved.
Is pulled upward against the biasing force of the spring 54. That is, the drive unit 50 separates the sealing member 40 from the exhaust port 33 to open the exhaust port 33. Therefore, the pressurized air flows through the nozzle 35 and is discharged from the exhaust port 33 to the atmosphere.
Due to this nozzle flow action, a negative pressure P0 is generated at the working port 34.

Thus, the air in the cylinder chamber 11SA is sucked and released into the atmosphere through the pipe 18, the working port 34 and the exhaust port 33. That is, the inside of the cylinder chamber 11SA has a negative pressure P0, and the inside of the cylinder chamber 11SB has an atmospheric pressure Pa. The piston 12 is moved by a large pressure (| P0 | + | Pa |), and the fulcrum 9 is pulled to the left in FIG. 1 via the piston rod 13. Therefore, the lower roller 5 can be released quickly.

Pull out the pilot pin 2 from the guide hole,
When restraining the position of the material W by the roller feeder 3, the power supply to the coil 51 is stopped. Then, the movable core 52 from which the suction force is released moves the sealing member 40 by the biasing force of the spring 54, and seals the exhaust port 33. Therefore, the pressure in the chamber 31 becomes P1, and the cylinder device 10
Moves the piston 12 as shown by the dotted line and releases the release.

According to this embodiment, however, the negative pressure generating means 30, the sealing member 40, and the driving means 50 are provided, and the positive pressure is immediately increased only by energizing and de-energizing the electromagnetic solenoids (51, 52). Since it is formed so as to be able to switch between P1 and negative pressure P0, the conventional main spool (21
1), the mechanical time lag of the sub spool (219) etc. can be wiped out, and the breakthrough speed (for example, 1/50 sec or less)
The working fluid can be switched with.

Further, the negative pressure generating means 30 includes the air supply port 32,
Since the nozzle 35 is built in the chamber 31 having the exhaust port 33 and the working port 34, the structure is extremely simple and the cost is low. Further, since the negative pressure P0 is also generated by using the pressurized air, no special energy is required. Further, since the electromagnetic switching valve 20 (30) and the load, that is, the cylinder device 10 may be communicated with each other by a single pipe 18, the piping work is easy and the layout space is small, and the positive pressure is immediately generated in the cylinder chamber 11SA. Since it can be switched between P1 and load P0, it can operate at a higher speed.

Further, the driving means 50 causes the electromagnetic solenoid (51,
Since it is configured to move and drive in the opening direction in 52), the coil 5 can be moved only when the pilot pin 2 is inserted.
It suffices to energize 1 to save power.

The electromagnetic solenoid (51, 52) is
Since the sealing member 40 can be reciprocally moved at an electrical speed and can be used more than 20 million times, instability factors due to wear and failure of mechanical elements such as the liner and packing of the conventional example (Fig. 5) are eliminated, and long-term It enables stable operation.

Further, the cylinder chamber 1 of the cylinder device 10
Since 1SB is open to the atmosphere, the cylinder chamber 11S
There is no time waste of releasing pressurized air after use in the cylinder chamber 11SB prior to or at the same time as supplying pressurized air to A, and high speed switching is possible from this point as well.

(Second Embodiment) In the second embodiment, as shown in FIG. 2, the sealing member 40 is connected to an electromagnetic solenoid (51,
The lower end portion 52D of the movable core 52 which forms 52) is formed. Therefore, the exhaust port 33 is
The diameter is smaller than the diameter of 2 (1 mm in this embodiment). The air supply port 32 is 2.6 mm. Further, escape holes 56, 5 for communicating the storage chamber 55 of the spring 54 with the atmosphere.
6 is provided for smooth exhaust emission.

However, according to this embodiment, the same effect as that of the first embodiment is obtained, and the sealing member is integrated with the movable core 52 (52D), so that it is more compact and the cost is reduced. Can be achieved.

(Third Embodiment) In this embodiment, as shown in FIG. 3, when the same cylinder device 10 as in the first embodiment is driven, a pair of reverse-operated electromagnetic switching valves 20A and 20B are provided. is there. That is, the operating port 3 of the electromagnetic switching valve 20A
4 and the one opening 11A of the cylinder 11 are connected by a pipe 18, and the operation opening 34 of the electromagnetic switching valve 20B and the other opening 11B.
And the electromagnetic solenoids (51,
52) is a control panel (not shown) that is excited and de-excited with a phase shift of 180 degrees.

Therefore, the cylinder chamber 11SA (11S
When positive pressure P1 is applied to B), the cylinder chamber 11SB
Since (11SA) becomes the negative pressure P0, the cylinder device 10 can be swiftly pressed by a much larger pressure (| P1 | + | P0 |).
Can be driven. In other words, it is possible to follow a high cycle release operation. Further, it is possible to generate a driving pushing force and a pulling back force in both directions on the piston rod 13.

[0043]

As described above, according to the present invention, the negative pressure generating means including the nozzle, the air supply port, the exhaust port, and the operating port, the sealing member, and the drive for sealing and opening the exhaust port of the sealing member. And a positive pressure and a negative pressure can be switched at the electric speed of the electromagnetic solenoid by using the pressurized air to be switched. The time lag due to the dynamic factors can be eliminated, and the switching operation can be performed at dramatically high speed. Further, the load can be driven in both directions with a single pipe.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment.

FIG. 3 is an overall configuration diagram showing a third embodiment.

FIG. 4 is a diagram for explaining a usage example of a conventional example.

FIG. 5 is a cross-sectional view for explaining a conventional example and its problems.

[Explanation of symbols]

 1 Press Machine 2 Pilot Pin 3 Roller Feeder 5 Lower Roller 6 Release Mechanism 10 Cylinder Device 11 Cylinder 11A One Port 11B Other Port 11SA, 11SB Cylinder Chamber 12 Piston 13 Piston Rod 15 Pressurized Air Source 16, 17, 18, 19 Piping 20 Electromagnetic switching valve 30 Negative pressure generating means 31 Chamber 32 Air supply port 33 Exhaust port 34 Actuating port 35 Nozzle 40 Sealing member 50 Driving means 51 Coil 52 Moving coil 52D Lower end (sealing member) 54 Spring 200 Conventional electromagnetic switching valve 201 to 204 No. 1 to No. 4 210 Bonnet 210S, 210SA, 210SB Main chamber 211 Main spool 212 Packing 213 Color 218 Control air passage 219 Sub spool 221 Switching air passage S1, S2 Electromagnetic solenoid 214 Fixed Yl 215 movable coil 216 coil 217 spring

Claims (1)

(57) [Claims] 1. A negative pressure is generated by a nozzle (35), an air supply port (32) arranged on the inlet side of the nozzle, an exhaust port (33) arranged on the outlet side of the nozzle, and a nozzle flow action. Negative pressure generating means (30) having an actuating port (34) connected to the exhaust port, and a sealing member formed so as to be capable of separating and approaching the exhaust port and sealing the exhaust port in the approaching state ( 40,52
D), an electromagnetic solenoid (51, 52) for urging in one direction, and a spring (54) for urging in the other direction, the exhaust port (33)
The sealing member (40, 52
An electromagnetic switching valve comprising: a driving unit (50) configured to be capable of reciprocally driving D).