JPH06300000A - Ejector device - Google Patents

Abstract

PURPOSE:To provide ejector equipment capable of adjusting the operating hour of a vacuum breaker. CONSTITUTION:This device is provided with an air passage 40 where an air tank 29 is incorporated in a vacuum breaker unit 1 and this tank is communicated with the secondary side of a supply valve 12, a vacuum breaking pilot passage 41 to be communicated with a pilot chamber 35 of a vacuum breaker 11, and a shuttle valve 42 to communicate the air tank 29 with the air passage 40 or the vacuum breaker pilot passage 41 in a switching manner according to the value of the air pressure on the secondary side of the supply valve, and a vacuum breaking time adjusting valve 45 where the flow rate can be adjusted downstream of the pilot chamber 35 in the vacuum breaker pilot passage 41. This constitution adjusts the operating time of the vacuum breaker 11 by adjusting the flow rate of the vacuum breaking time adjusting valve 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector device suitable for sucking and conveying articles.

[0002]

2. Description of the Related Art When a suction pad sucks and conveys a desired work by a vacuum pressure generated by an ejector device, compressed air is supplied to the suction pad in order to quickly release the work conveyed to a predetermined position. Ejector devices have been proposed that incorporate a supply vacuum break valve. However, the above-mentioned proposed ejector device has a problem that the operating time of the vacuum breaking valve becomes long because there is no adjusting means for adjusting the operating time of the vacuum breaking valve.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ejector device capable of adjusting the operating time of a vacuum break valve.

[0004]

In order to solve the above problems, an ejector device according to the present invention comprises an ejector unit for generating a vacuum pressure and a valve unit for supplying compressed air to the ejector unit. A supply passage for supplying compressed air to the pressure side of the ejector unit, a suction passage for communicating the suction port with the suction side of the ejector unit, an exhaust passage for communicating the exhaust side of the ejector unit with the outside, and Vacuum break valve and supply valve of
In an ejector device having a vacuum break passage for communicating the output side of the vacuum break valve with a suction port and a break flow rate adjusting valve provided in the vacuum break passage, the vacuum break valve is provided in a pilot chamber. A pilot type valve that operates by the supplied and discharged pilot air pressure, and an air tank incorporated in the valve unit in the ejector device, an air passage for communicating the air tank to the secondary side of the supply valve, and an air tank for the vacuum break valve. Of the pilot chamber and the break pilot passage communicating with the outside, a shuttle valve for switching the air tank to the air passage and the break pilot passage for communication by switching the air pressure on the secondary side of the supply valve, and the pilot chamber in the break pilot passage. It is characterized in that a breakdown time adjusting valve capable of adjusting the flow rate further downstream is provided.

In order to solve the same problem, an ejector unit for generating a vacuum pressure and a valve unit for supplying compressed air to the ejector unit are provided, and the valve unit supplies the compressed air to the pressure side of the ejector unit. To the suction side of the ejector unit, an exhaust passage for communicating the exhaust side of the ejector unit to the outside, a vacuum break valve and a supply valve in the supply passage, An ejector device having a vacuum break passage for communicating an output side of the vacuum break valve with a suction port, and a break flow rate adjusting valve provided in the vacuum break passage for adjusting a flow rate, wherein the vacuum break valve and the supply valve of the ejector device are provided. Is a pilot type valve that operates with pilot air pressure supplied to and discharged from the pilot chamber, and the pilot chamber of the supply valve is connected to the ejector device. Pilot output passage that communicates with the outlet port of the pilot valve, break pilot passage that communicates the pilot chamber of the supply valve with the pilot chamber of the vacuum break valve and the outside, fluid pressure of the output port of the pilot valve and pilot chamber of the supply valve A shuttle valve for switching the pilot chamber of the supply valve to the pilot output passage and the breaking pilot passage to communicate with each other depending on the height of the valve, and a breaking time adjusting valve capable of adjusting the flow rate downstream of the pilot chamber of the vacuum breaking valve in the breaking pilot passage. It is characterized by having and.

[0006]

[Operation] When the supply valve is operated by an appropriate operating force,
Since the supply flow path is opened and compressed air is supplied to the pressure side of the ejector unit, vacuum pressure acts on the suction port by the ejector unit, and at the same time, the shuttle valve opens the air passage and shuts off the break pilot passage. , Compressed air is stored in the air tank. When the supply valve closes the supply passage by releasing the operating force, the suction force of the ejector unit does not act on the suction port, and the secondary pressure in the supply passage decreases, causing the shuttle valve to connect the air tank and the air passage. Since the air tank is closed and the destruction pilot passage is communicated, most of the air stored in the air tank is supplied to the pilot chamber of the vacuum breaking valve, so the vacuum breaking valve opens the vacuum breaking passage and compresses it to the suction port. Outputs air. When the air in the air tank supplied to the pilot chamber of the vacuum break valve is gradually discharged to the outside from the break pilot passage and the air pressure in the pilot chamber of the vacuum break valve decreases, the vacuum break valve is placed in a position that shuts off the vacuum break passage. Return. In this case, by adjusting the flow rate of the air discharged from the breaking pilot passage to the outside by the breaking time adjusting valve, it is possible to adjust the decrease time of the air pressure in the breaking pilot passage, in other words, the operating time of the vacuum breaking valve. .

Further, when the pilot valve is operated to supply pilot air to the pilot chamber of the supply valve, the supply flow path is opened to supply compressed air to the pressure side of the ejector unit, and the ejector unit vacuum pressures the suction port. Works. In this case, no pilot air is supplied to the pilot chamber of the vacuum break valve because the break pilot passage is closed by the shuttle valve. When the output of the supply valve to the pilot chamber by the pilot valve is released, the output pressure at the outlet port of the pilot valve decreases and the shuttle valve connects the pilot chamber of the supply valve to the destruction pilot passage. Since most of the air is supplied to the pilot chamber of the vacuum break valve, the vacuum break control valve opens the vacuum break passage and outputs compressed air to the suction port. When the air supplied to the pilot chamber of the vacuum breaking valve is gradually discharged to the outside from the breaking pilot passage and the air pressure in the pilot chamber of the vacuum breaking valve decreases, the vacuum breaking valve returns to the position where it shuts off the vacuum breaking passage. . Also in this case,
By adjusting the flow rate of the air discharged from the breaking pilot passage to the outside by the breaking time adjusting valve, it is possible to adjust the decrease time of the air pressure in the breaking pilot passage, in other words, the operating time of the vacuum breaking valve.

[0008]

FIG. 1 shows a first embodiment of the present invention. This ejector device comprises a valve unit 1, an ejector unit 2 and a vacuum pressure detection unit 3 which are connected by appropriate means. A supply passage 6, a suction passage 7, an exhaust passage 8 and a vacuum breaking passage 9 are formed in the main body 5,
The vacuum break valve 11 and the supply valve 12 are provided in the supply passage 6, the filter 13 is provided in the suction passage 7, the silencer 14 is provided in the exhaust passage 8,
A breaking flow rate adjusting valve 15 whose flow rate can be adjusted in the vacuum breaking passage 9.
But each is installed.

The ejector unit 2 includes a diffuser 17
a, 17b and a nozzle 19 whose tip opens toward the diffuser 17a, and the pressure chamber 20 is provided behind the nozzle 19.
However, the intake chambers 21a and 21b are provided between the nozzle 19 and the diffuser 17a, and between the diffusers 17a and 17b.
An exhaust chamber 22 is formed at the tip of the diffuser 17b. The supply passage 6 is provided with a compressed air supply port 24 and a pressure chamber 20 opened on the left side surface of the main body 5, and the suction passage 7 is provided with intake chambers 21a and 21b and a suction port 25 opened on the left side surface and the lower surface of the main body 5. The exhaust passage 7 communicates the exhaust chamber 22 with the exhaust ports 27 of the cover 26. Reference numeral 16 in FIG. 1 is a check valve for preventing backflow of air from the suction chamber 21b to the suction passage 7.

The valve cover 2 is provided on the upper surface of the main body 5.
8, a tank body 30 having an air tank 29, a cover 31 for covering the tank body 30, and an adapter plate 3
2 are sequentially installed, and an electromagnetically driven pilot valve 33 that outputs pilot air to the supply valve 12 is installed on the adapter plate 32. The vacuum break valve 11 installed over the main body 5 and the valve cover 28 has a pilot chamber 35 communicating with a break pilot passage described later, and when air is supplied to the pilot chamber 35, the vacuum break passage 9 is opened. The pilot poppet valve is a well-known pilot type poppet valve that closes the vacuum break passage 9 when the air in the pilot chamber 35 is discharged. Further, the supply valve 12 installed in the same manner as the vacuum break valve has a pilot output passage 37.
Has a pilot chamber 38 that communicates with an outlet port described later of the pilot valve 33. When pilot air is supplied to the pilot chamber 38, the supply passage 6 is opened, and when the air in the pilot chamber 38 is discharged, a return spring 39 is provided. It is configured as a well-known pilot type poppet type valve that closes the supply passage 6 by the urging force of. However, the supply valve 12 may be directly driven by another driving means such as a solenoid.

The valve cover 28 and the tank body 30 are
An air passage 40 that connects the secondary side of the supply valve 12 to the air tank 29 is provided, and a destruction pilot passage 41 that is branched from the air passage 40, and a shuttle valve 42 is installed at the branch portion of the passage 41. . The shuttle valve 42 connects the air passage 40 to the air tank 29 to close the breakage pilot passage 41 when the supply valve 12 operates to open the supply passage 6, and the supply valve 12 closes the secondary side thereof. When the pressure drops, the air passage 40 is connected to the destruction pilot passage 41. Then, the breaking pilot passage 41 communicates with the pilot chamber 35 of the vacuum breaking valve 11 and the pilot exhaust port 43 of the pilot valve 33, and the flow rate is changed to the downstream side of the pilot chamber 35 of the pilot breaking passage 41 by the rotation of the handle 44. A breakage time adjusting valve 45 that can be adjusted is installed. Therefore, when the supply valve 12 opens the supply passage 6, compressed air is stored in the air tank 29, and when the supply valve 12 closes the supply passage 6, most of the air stored in the air tank 29 is in the pilot chamber 35 of the vacuum break valve 11. Is supplied to the outside through the break time adjusting valve 45 and the pilot exhaust port 43, and the operating time of the vacuum break valve 11 by the compressed air supplied to the pilot chamber 35 is
The rotation of the handle 44 can be adjusted by adjusting the amount of air discharged to the outside through the breakage time adjusting valve 45.

The pilot valve 33 has an inlet port 33p that communicates with a pilot supply passage branched from the primary side of the supply valve 12 in the supply passage 6, and an outlet port that communicates with a pilot chamber 38 of the supply valve 12 through a pilot output passage 37. 33a and an exhaust port 33r that communicates with the pilot exhaust port 43, and is configured as a well-known three-port solenoid valve that connects the outlet port 33a to the inlet port 33p and the exhaust port 33r by communicating with each other by exciting and deenergizing the solenoid. ing. However, the pilot valve is not limited to the electromagnetically driven three-port valve, and may be driven by a five-port valve, fluid pressure, mechanical operating means, or the like. When the supply valve 12 is directly driven by a driving means other than the pilot valve 33, the pilot valve can be omitted.

The vacuum pressure detection unit 3 is equipped with a pressure sensor for detecting the vacuum pressure, a vacuum pressure switch operated by the output of the pressure sensor, etc. (all not shown), but these are directly connected to the present invention. Since it is not related, detailed description is omitted.

FIG. 1 shows a state in which the pilot valve 33 is inactive and the air stored in the air tank 29 is discharged to the outside from the exhaust port 43. In this state, the vacuum break valve 11 and the supply valve 12 are The vacuum break passage 9 and the supply passage 6 are closed, so that the ejector unit 2 is not operating. When the pilot valve 33 is operated to output pilot air to the pilot chamber 38 of the supply valve 12, the supply valve 12
Opens the supply passage 6 to supply compressed air to the pressure chamber of the ejector unit 2, so that the ejector unit 2 operates and a vacuum pressure acts on the suction pad 48 connected to the suction port 25 to apply a desired work. (Not shown) is adsorbed. The air discharged from the ejector unit 2 is silenced by the silencer 14 in the exhaust passage 8 and discharged to the outside through the exhaust port 27. Further, the opening of the supply passage 6 by the supply valve 12 causes the shuttle valve 42 to communicate the air passage 40 with the air tank 29, so that compressed air is supplied to the air tank 29. In this case, since the shuttle valve 42 closes the break pilot passage 41 with the air pressure acting on the valve, no air is output to the pilot chamber 35 of the vacuum break valve 11.

When the pilot valve 33 is deactivated after suction and transfer of the work by the suction pad 48, the air in the pilot chamber 38 of the supply valve 12 passes from the exhaust port 43 through the outlet port 33a and the exhaust port 33r of the pilot valve 33. Since it is discharged to the outside, the supply valve 12 closes the supply passage 6 and the operation of the ejector unit 2 is stopped. Further, by closing the supply passage 6 with the supply valve 12, the shuttle valve 42
Since most of the air stored in the air tank 29 is supplied to the pilot chamber 35 of the vacuum break valve 11 in order to communicate the air tank 29 with the break pilot passage 41,
The vacuum break valve 11 opens the vacuum break passage 9 to supply compressed air for releasing suction of the work to the suction pad 48.
Further, by communicating the destruction pilot passage 41 with the air tank 29, the rest of the air stored in the air tank 29 is discharged to the outside from the exhaust port 43 through the destruction time adjusting valve 45. Therefore, the opening time of the vacuum breaking passage 9 by the vacuum breaking valve 11 is determined by the handle 4 of the breaking time adjusting valve 45.
It can be adjusted by adjusting the amount of air flowing through the breakage time adjusting valve 45 by rotating 4.

In the first embodiment, the ejector unit 2 generates a vacuum pressure by the operation of the supply valve 12, and
Since part of the compressed air flowing through the supply passage 6 is stored in the air tank 29 through the shuttle valve 42, the air tank 2
The air supply to 9 is reliable. Further, when the supply valve 12 closes the supply passage 6, the shuttle valve 42 connects the air tank 29 and the break pilot passage 41, so that the vacuum break valve 11 operates without delay. Further, the handle 4 of the breaking time adjusting valve 45 provided in the breaking pilot passage 41
By adjusting the flow rate of the air flowing through the breaking time adjusting valve 45 by rotating 4, the opening time of the vacuum breaking passage 9 by the vacuum breaking valve 11 can be adjusted to a desired time.

The pilot valve is a double-solenoid three-position valve having a switching position in which all communication between the ports is cut off, and the backflow of air from the suction chamber 21a to the suction passage 7 is prevented. Therefore, if a check valve (not shown) similar to the check valve 16 is provided, the suction passage 7 can be maintained in a vacuum state. Therefore, even if the supply of the compressed air to the ejector device is stopped due to a power failure or the like, the work adsorbed by the adsorption pad 48 does not drop. If the vacuum breaking valve 11 is provided with a spring having an urging force capable of holding the vacuum pressure, the vacuum breaking valve 11 can be prevented from opening even if the supply of compressed air is stopped. When releasing the work adsorbed by the suction pad 48, by exciting the other solenoid of the three-position valve,
The vacuum break valve 1 by the air stored in the air tank 29
2 works. Also in this case, since the vacuum breaking time can be adjusted by rotating the handle 44, the excitation of the solenoid may be temporary.

FIG. 2 shows a second embodiment of the present invention. The ejector device according to the second embodiment comprises an air tank 29 and an air passage 4.
The break pilot passage 53 does not have 0, and is branched from the pilot output passage 52 that communicates with the pilot chamber 51 of the supply valve 12. When the pilot air is output from the outlet port 33a of the pilot valve 33 to the pilot output passage 52, the shuttle valve 54 installed at the branch portion of these passages connects the pilot output passage 52 to the pilot of the supply valve 12. When the air pressure in the pilot output passage 52 is reduced by communicating the chamber 51 with the destruction pilot passage 53 and closing the outlet port 33a of the pilot valve 33 and the exhaust port 33r, the pilot output port 52 is closed and the pilot chamber is closed. 51
Is configured to communicate with the destruction pilot passage 53. The other structure and operation of the second embodiment are the same as those of the first embodiment except that the vacuum break valve 11 is operated by the pilot air supplied to the pilot chamber 51 of the supply valve 12, and therefore detailed description will be given. Omit it. In the second embodiment described above, since the pilot air supplied to the pilot chamber 51 of the supply valve 12 is used for the operation of the vacuum break valve, wasteful discharge of air can be eliminated.

[0019]

In the ejector device of the present invention, when a vacuum pressure is generated in the ejector unit by operating the supply valve, compressed air is supplied to the air tank incorporated in the valve unit or compressed air is supplied to the pilot chamber of the supply valve. When supplied, the supply valve operates to generate a vacuum pressure in the ejector unit, and when the supply of compressed air to the ejector unit is stopped by the supply valve, the air in the air tank or the pilot chamber of the supply valve moves through the break pilot passage. It is supplied to the pilot chamber of the vacuum break valve through which the vacuum break valve operates to open the vacuum break passage, so that suction of the work by the suction pad can be released. Therefore,
No control device or control circuit is required to operate the vacuum break valve. In addition, a breakage time adjusting valve whose flow rate can be adjusted is provided on the downstream side of the vacuum breaking valve pilot chamber in the breakage pilot passage. Therefore, the breaking time adjusting valve can adjust the opening time of the vacuum breakage passage by the vacuum breaking valve. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a first embodiment.

FIG. 2 is a vertical sectional front view of a main part of a second embodiment.

[Explanation of symbols]

 1 Valve unit 2 Ejector unit 6 Supply passage 7 Suction passage 8 Exhaust passage 9 Vacuum break passage 11 Vacuum break valve 12 Supply valve 15 Break flow control valve 25 Suction port 29 Air tank 33 Pilot valve 33a Outlet port 35, 51 Pilot chamber 40 Air passage 41,53 Breaking pilot passage 42,54 Shuttle valve 45 Breaking time adjusting valve 37,52 Pilot output passage

Claims (2)

[Claims] 1. An ejector unit for generating a vacuum pressure, and a valve unit for supplying compressed air to the ejector unit, the valve unit including a supply passage for supplying compressed air to a pressure side of the ejector unit, and a suction unit. A suction passage that connects the port to the suction side of the ejector unit, an exhaust passage that communicates the exhaust side of the ejector unit to the outside, a vacuum break valve and a supply valve in the supply passage, and a suction side of the vacuum break valve. Vacuum break passage to communicate with the port,
An ejector device having a break flow rate adjusting valve capable of adjusting a flow rate provided in the vacuum break passage, wherein the vacuum break valve is a pilot type valve operated by pilot air pressure supplied to and discharged from a pilot chamber, and the ejector device is provided. , An air tank incorporated in the valve unit, an air passage communicating the air tank with the secondary side of the supply valve, a break pilot passage communicating the air tank with the pilot chamber of the vacuum break valve and the outside, and a secondary supply valve A shuttle valve for switching the air tank to the air passage and the destruction pilot passage for communication by changing the side air pressure and a destruction time adjusting valve capable of adjusting the flow rate downstream of the pilot chamber in the destruction pilot passage are provided. Characteristic ejector device. 2. An ejector unit for generating a vacuum pressure, and a valve unit for supplying compressed air to the ejector unit, the valve unit including a supply passage for supplying compressed air to a pressure side of the ejector unit, and a suction unit. A suction passage that connects the port to the suction side of the ejector unit, an exhaust passage that communicates the exhaust side of the ejector unit to the outside, a vacuum break valve and a supply valve in the supply passage, and a suction side of the vacuum break valve. Vacuum break passage to communicate with the port,
An ejector device having a breaking flow rate adjusting valve provided in the vacuum breaking passage, the flow rate of which is adjustable, wherein the vacuum breaking valve and the supply valve of the ejector device are operated by pilot air pressure supplied to and discharged from a pilot chamber. In the ejector device, a pilot output passage that connects the pilot chamber of the supply valve to the outlet port of the pilot valve, a breakage pilot passage that connects the pilot chamber of the supply valve to the pilot chamber of the vacuum break valve and the outside, and a pilot A shuttle valve that connects the pilot chamber of the supply valve to the pilot output passage and the breaking pilot passage for communication by switching the fluid pressure between the output port of the valve and the pilot chamber of the feeding valve, and the pilot of the vacuum breaking valve in the breaking pilot passage. A break time adjustment valve that can adjust the flow rate downstream of the chamber is provided. Ejector device that.