JPH0121199Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses compressed air to jet air from the nozzle hole to the ejector hole, and during the jet, air in the intake chamber formed between the nozzle hole and the ejector hole is sucked. This relates to an ejector pump that generates a vacuum in the intake chamber and the system connected to it.It uses a pilot valve that operates based on the air pressure difference to open and close the nozzle hole, allowing a relatively small electromagnetic switching valve to generate a large amount of air. In addition to supplying compressed air to obtain a strong suction force, pressure chambers are provided at the front and rear of the pilot valve, and these are alternately communicated with the compressed air and the atmosphere through electromagnetic switching valves. This allows the valve to operate reliably.

Next, the details will be explained with reference to the illustrated embodiment. Reference numeral 1 denotes a pump body having a substantially flat square shape, and an ejector block 2 having an ejector hole 2a from the right end in a hole drilled through the pump body in the longitudinal direction, and an ejector block 2 having an ejector hole 2a from the right end. Nozzle blocks 3 having nozzle holes 3a corresponding to holes 2a are fitted one after another, and an air chamber 4 is maintained between the nozzle holes 3a and ejector holes 2a by legs 3b provided on the nozzle blocks 3. A suction port 7 is formed on the lower surface of the main body 1 via a through hole 5 and a check valve 6 provided in the through hole 5.
is connected to.

A pilot valve 8 is slidably fitted into the main body hole on the left side of the nozzle block 3, and a compressed air inlet 9 is provided at the left end of the hole by screwing a conduit connector 9a. The tip 8a of the pilot valve 8 is provided with a sealing member that closes the inlet of the nozzle hole 3a, and the pilot valve 8 is provided with a sealing member that closes the inlet of the nozzle hole 3a, and the pilot valve 8 is provided with a gap 10 around the tip 8a to communicate with the compressed air inlet 9. Longitudinal through hole 8b
and a horizontal hole 8c.

This pilot valve 8 has a relatively large-diameter body, and pressure chambers 11 and 12 are provided between the front and rear shoulders and the main body 1, respectively, while the middle part of the through hole 8b in the longitudinal direction of the valve A branch passage hole 13 is bored in the pressure chambers 11, 12 and this passage hole 13.
are through holes 11' and 1 bored in the main body 1, respectively.
2', 13', a through hole 17 for supplying compressed air to the valve chambers 15, 16 of the five-way electromagnetic switching valve 14 mounted on the upper surface of the main body 1 and to each valve chamber 15, 16.
The valve chambers 15 and 16 of the switching valve are also connected to the atmosphere through exhaust holes 18 and 19, respectively, and each valve chamber 15 and 16 has a movable iron piece operated by the solenoid 14a of the switching valve 14. The valve bodies 15a and 16a connected to the valve body 14b are fitted, and the valve body 1
5a, 16a, the pressure chambers 11, 1
2 alternately communicate with the compressed air inlet 9 and the exhaust holes 18 and 19, respectively.

20 is a vacuum switch, and as shown in FIG. Valve 25 and valve receiver 2
A magnet 29 is attached to the movable end 21a of the bellows 21, and a magnet 29 is attached to the moving end 21a of the bellows 21.
A reed switch 30 is attached to the reed switch via a mounting frame 32 screwed onto an adjustment screw 31. When the system connected to the suction port 7 becomes vacuum, the magnet 29 is moved by the bellows 21, and the reed switch is activated at a predetermined degree of vacuum. 30 temporarily stops the ejector pump via the switching valve 14, the vacuum is maintained in the system by the check valve 6, and when the degree of vacuum decreases, the reed switch 30
The ejector pump is now operating again. When the vacuum in the system is released, the valve 25 is pressed against the valve holder 26 against the spring 24 and decelerates the flow rate of air, preventing the air from rapidly flowing into the bellows chamber 23 and damaging the bellows 21. prevent. A piston may be used instead of the bellows 21.

33 is an electromagnetic opening/closing valve for vacuum release attached to the lower surface of the main body 1, and one opening of the valve chamber 33a is compressed through the through hole 34 of the main body 1 and the branch through hole 35 of the pilot valve through hole 8b and the through hole 8b. It communicates with the air introduction port 9, and the other port communicates with the suction port 7 through a main body through hole 37 with a flow rate regulating valve 36 interposed therebetween. This passage is closed by a valve body 33c fitted in the valve chamber 33a and pressed by a spring 33b.

FIG. 3 shows an example of the wiring diagram of the ejector pump of the present invention, in which the solenoid 14a of the electromagnetic switching valve 14 for pump operation is connected to the reed switch 3 of the vacuum switch 20.
0 (regular time) and a pump operation changeover switch 38 provided separately, the open contact 38a of the changeover switch 38 is connected to the solenoid 33d of the vacuum release on/off valve 33 via a timer 39. . 40 is a power switch.

To explain the operation of this ejector pump, the suction port 7 on the bottom surface of the main body 1 is connected, for example, to the suction cup A of a vacuum gripping device via a conduit 41, and the inlet port 9 on the left side is connected to a compressed air supply source such as a compressor. send air. In this case, the solenoid 14a of the electromagnetic switching valve 14 is not energized, and the valve bodies 15a, 16a
is pressed by the spring 14c and moves to the left, communicating the pressure chamber 12 with the compressed air inlet 9 and the pressure chamber 11 with the atmosphere, so the pilot valve 8 moves to the right and the tip 8a closes the nozzle hole 3a. There is.

Next, when the power switch 40 is closed and the pump operation changeover switch 38 is switched to the closed contact 38b side to energize the solenoid 14a of the electromagnetic changeover valve 14, the valve bodies 15a and 16a are moved by the spring 1 through the movable iron piece 14b.
4c to the right and connect the pressure chamber 11 at the front of the pilot valve 8 to the compressed air inlet 9 as shown in FIG.
Then, the rear pressure chambers 12 are communicated with the atmosphere, so the pilot valve 8 is pushed by the high-pressure pressure chamber 11 and moves to the left, so that the tip 8a opens the inlet of the nozzle hole 3a, and the compressed air flows through the through holes 8b and 8c. and void 10
The air in the suction cup A is ejected from the nozzle hole 3a to the ejector hole 2a from the intake chamber 4 to the ejector hole 2a.
Since the suction cup A is sucked into the interior of the suction cup A and discharged to the outside through the silencer 42, the pressure inside the suction cup A is reduced, and the component B can be sucked and transported to a required location. When the vacuum system reaches a predetermined degree of vacuum, vacuum switch 2 is activated.
0 magnet 29 moves and the reed switch 30 opens, the solenoid 14a is de-energized and the ejector pump is stopped, but the system is maintained at a predetermined negative pressure by the check valve 6, saving compressed air consumption. can do. When the degree of vacuum decreases due to air leakage or the like, the vacuum switch 20 is activated to raise the vacuum inside the system to a predetermined degree again.

After conveying the adherend B, if the changeover switch 38 is switched to the open contact 38a side, the solenoid 1 of the changeover valve 14
4a stops, the ejector pump stops, and the vacuum release on/off valve 33 is activated via the timer 39.
The solenoid 33d is energized and the on-off valve 33 is opened, so that compressed air is powerfully supplied to the suction port 7 through the through holes 35, 34 and 37, rapidly releasing the negative pressure inside the suction cup A and removing the adhesion. The body B can be separated, and the conveyance work can be carried out accurately. The amount of compressed air to be fed can be adjusted appropriately by a flow rate regulating valve 36, and the feeding time can be adjusted by a timer 39, respectively.

As mentioned above, the ejector pump of the present invention uses the pilot valve 8, which is operated by air pressure difference, to open and close the nozzle hole 3a, and by using a large diameter valve, it can be operated by a relatively small electromagnetic switching valve 14. A large amount of compressed air can be sent to the nozzle hole 3a to increase the suction force of the pump, and as described above, pressure chambers 11 and 11 are provided at the front and rear of the pilot valve 8, respectively.
12 is provided between the main body 1 and the five-way electromagnetic switching valve 14 provided on the outside of the main body 1 alternately communicates with high pressure air and the atmosphere to operate the same valve 8. , those that use an auxiliary spring to return the pilot valve (for example, Jitsukasho
58-82500), the operation of the pilot valve 8 is performed quickly and reliably, and in the present invention, as described above, a solenoid valve is further provided in the main body 1 so that the pilot valve 8 closes the nozzle hole 3a and closes the pump. When the operation is stopped, compressed air is sent to the suction port 7 for a predetermined period of time to release the vacuum, so only the amount of compressed air necessary to release the vacuum can be sent, reducing the amount of compressed air consumed. It has practical effects such as being able to

[Brief explanation of the drawing]

The drawings show one embodiment of the ejector pump of the present invention, with FIG. 1 being a longitudinal sectional front view, FIG. 2 being a partially enlarged sectional view of a vacuum switch, and FIG. 3 being a wiring diagram. 1...Pump body, 2...Ejector block,
3... Nozzle block, 6... Check valve, 7... Suction port, 8... Pilot valve, 9... Compressed air inlet, 14... Solenoid switching valve, 2... Vacuum switch, 33... Vacuum Release on/off valve, 38...operation changeover switch, 39...timer, 40...power switch, A...suction cup, B...adherent.

Claims (1)

[Scope of utility model registration request] A nozzle block 3 having a nozzle hole 3a in a hole drilled in the pump body 1, and the nozzle hole 3a
An ejector block 2 having an ejector hole 2a corresponding to the nozzle hole 3a and the ejector hole 2 are fitted into the nozzle hole 3a.
The air intake chamber 4 formed between the holes 1 and 1 is connected to a suction port 7 provided on one side of the main body 1, and a pilot valve 8 for opening and closing the nozzle hole 3a is inserted at the tip 8a in the hole of the main body 1. The pilot valve 8 is fitted in a movable manner so that the gap 10 around the tip 8a is connected to a compressed air inlet 9 provided on the outside of the main body.
Pressure chambers 11 and 12 are provided at the front and rear of the main body 1, respectively, and five ports are provided on the outside of the main body 1, which alternately communicate the pressure chambers 11 and 12 with the compressed air inlet 9 and the atmosphere. An electromagnetic switching valve 14 is provided, and by operating the switching valve 14, one pressure chamber becomes higher pressure than the other pressure chamber, and the pilot valve 8 is moved to open and close the nozzle hole 3a. A solenoid valve is further provided on the outside of the main body 1 to send compressed air from the compressed air inlet 9 to the suction port 7 for a predetermined period of time when the pilot valve 8 closes the nozzle hole 3a and stops pump operation. Ejector pump that can supply