JPH11114862A - Vacuum generating unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce wiring man-hours, and prevent the occurrence of erroneous wiring by arranging a timer part in a vacuum switch part. SOLUTION: A command signal inputted to a command input part in a vacuum switch part 20 is simultaneously derived to a timer part, and is also introduced to a vacuum break output part. A breaking pilot solenoid valve 24 is actuated, and a breaking valve 36 is put in an ON condition by pilot pressure supplied from here. As a result, compressed air is supplied to an attracting pad through a vacuum port 34, and an attracting condition of the attracting pad to a work is released. In this case, the timer part starts to count pulses on the basis of the command signal outputted from the command input part, and when it reaches the constant pulse number, a stopping signal is derived to the vacuum breaking output part, and the breaking valve 36 is put in an OFF condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum generating unit in which a vacuum switch unit having a timer unit for controlling a vacuum breaking solenoid valve is integrally incorporated.

[0002]

2. Description of the Related Art Conventionally, there has been known a vacuum generating unit provided with, for example, a supply valve for supplying a negative pressure or compressed air, a vacuum break valve, an adsorption confirmation switch serving as a vacuum detecting means, a filter, and the like. The electrical mechanism is connected to a control device such as a sequencer by signal wiring using individual lead wires or the like, and a control signal is transmitted.

Here, a vacuum generating unit according to the prior art devised by the present applicant is shown in FIG.
-73106). This vacuum generating unit 1
Then, the suction pilot solenoid valve 2 for controlling the supply valve,
A breaking pilot solenoid valve 3 for controlling the vacuum breaking valve and a suction confirmation switch 4 are individually connected to signal terminals of a sequencer (not shown).

[0004]

By the way, the sequencer manages all signal wiring of peripheral devices of a plurality of vacuum generating units, and the control timing of the peripheral devices is also processed inside the sequencer.

Therefore, the number of signal wirings from various peripheral devices including the vacuum generating unit to the sequencer is very large, which not only complicates the wiring work of the signal wirings, but also raises a concern that erroneous wirings may occur.

In this case, by using a throttle valve such as an air timer provided separately from the vacuum generating unit,
Although the vacuum breaking time can be freely set, the provision of the throttle valve or the like separately increases the number of parts and increases the manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to overcome the various disadvantages described above, and reduces the number of wiring steps to prevent the occurrence of erroneous wiring and the like, and reduces the number of parts to reduce the manufacturing cost. It is an object of the present invention to provide a vacuum generating unit capable of performing the above.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main body provided with a compressed air supply port and a vacuum port, and a vacuum generation mechanism connected to or inside an external vacuum generation source. A solenoid valve portion provided with a suction solenoid valve and a vacuum break solenoid valve for switching between a negative pressure state and a positive pressure state, and a predetermined negative pressure provided between a vacuum generating mechanism and a vacuum port. And a vacuum switch unit that is turned on from an off state when the pressure reaches a predetermined value.When the vacuum switch unit switches from a negative pressure state to a positive pressure state, the vacuum break solenoid valve is turned on, and a predetermined voltage is applied. A timer unit for controlling the vacuum breaking solenoid valve from an on state to an off state after a lapse of time is provided.

According to the present invention, the timer section for adjusting the vacuum break time is provided in the vacuum switch section, and the power supply section is shared with the suction solenoid valve and the vacuum break solenoid valve, thereby reducing the number of wiring steps. You.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A vacuum generating unit according to the present invention will be described in detail below with reference to the accompanying drawings showing preferred embodiments.

In FIG. 1, reference numeral 10 denotes a vacuum generating unit according to an embodiment of the present invention.

The vacuum generating unit 10 basically includes an ejector 1 having a main body 12 and a pressure sensor 14.
A vacuum switch section 20 provided with a pressure sensor section 18 and the like for detecting a pressure state in the pump 6;
2 and an electromagnetic valve portion 26 comprising a vacuum breaking pilot electromagnetic valve 24.

A compressed air supply port 28 for supplying compressed air to the ejector 16 functioning as a vacuum generating mechanism is disposed on a side wall of the main body 12. The compressed air supply port 28 communicates with the ejector 16. A suction valve 32 for supplying and shutting off compressed air and a release valve 36 for releasing the vacuum port 34 from a vacuum state are provided in the middle of the compressed air supply passage 30 to be made. .

A filter 38 is provided between the vacuum port 34 and the ejector 16 for removing dust, moisture and the like of the sucked air. Also, a compressed air discharge port 40 for discharging compressed air from the ejector 16 is provided.
The compressed air discharge port 40 is connected to the ejector 1
A muffler 42 is provided for reducing the noise generated from the compressed air discharged from the nozzle 6.

A suction pad (not shown) is connected to the vacuum port 34 via a tube or the like.

Next, a schematic configuration of the vacuum switch unit 20 is shown in FIG.

The vacuum switch unit 20 includes a command / input unit 44 into which a command signal output from a CPU provided in a sequencer (not shown) is introduced, and the command / input unit 44.
And an attraction output section 46 for controlling on / off of the attraction pilot solenoid valve 22 based on a command signal introduced into the attraction controller. The suction valve 32 is controlled to be turned on / off under the action of a pilot pressure supplied from the suction pilot solenoid valve 22.

In this case, when the suction valve 32 is turned on, a negative pressure fluid is supplied from the vacuum port 34 to a suction pad (not shown), and the work is suctioned under the negative pressure.

The vacuum switch section 20 includes a vacuum break output section 48 for turning on / off the vacuum break pilot solenoid valve 24 based on a command signal introduced to the command / input section 44, and the command / input section. It is provided between the vacuum break output unit 44 and the vacuum break output unit 48, starts counting the number of pulses based on a command signal from the CPU, and turns off the break valve 36 when a predetermined number of pulses is reached. Timer section 50 for outputting an operation stop signal to the vacuum break output section 48
And

In this case, by turning on the release valve 36, a positive pressure is supplied to the suction pad, and the work can be released from the suction pad.

Further, the vacuum switch unit 20 outputs a detection signal corresponding to the pressure state in the ejector 16 to the pressure sensor 14.
Sensor section 52 introduced from the sensor, and a sensor output section 54 for deriving a detection signal from the pressure sensor section 52 to the CPU.
And The vacuum switch unit 20 is provided with a power supply unit 58 via a connector 56.
Are electrically connected to various components provided in the vacuum switch section 20, and as shown in FIG. 1, the suction pilot solenoid valve 22 and the destruction pilot solenoid 22 are connected via lead wires 60a and 60b. It is connected to the solenoid valve 24, respectively.

The vacuum generating unit 10 according to the embodiment of the present invention is basically constructed as described above. Next, the operation and effect of the unit will be described.

When transferring a work (not shown), first,
For example, a command signal derived from the CPU of the sequencer (not shown), such as “suck the work”, is a command / command.
Input to the input unit 44, the command signal is output to the suction output unit 4
6 (see FIG. 4A). The suction output unit 4
In step 6, an operation signal is sent to the suction pilot solenoid valve 22 to operate the suction pilot solenoid valve 22, and the suction valve 32 is turned on (the valve open state) by the pilot pressure supplied from the suction pilot solenoid valve 22. ) (See FIG. 4B).

As a result, the ejector 16 inside the main body 12 is
Is supplied with compressed air to generate a negative pressure, and the vacuum port 34
Then, a negative pressure is supplied to a suction pad (not shown). When the suction pad sucks the work under negative pressure, the ejector 1
When the negative pressure generated by the pressure sensor 6 further increases and the negative pressure exceeds a pressure set in advance in the pressure sensor unit 52, a detection signal is sent from the pressure sensor unit 52 to the sensor output unit 54, and the sensor output unit 54 Sends a suction confirmation signal to the CPU of the sequencer.

When the sequencer receives the suction confirmation signal output from the sensor output unit 54, it confirms that the work has been reliably sucked.

Next, while maintaining the state in which the work is sucked by the suction pad, the work is moved by a predetermined distance by operating a robot arm or the like (not shown).
A case where the negative pressure of the suction pad is released to release the work to a predetermined position will be described.

First, a command signal, for example, "remove the work", derived from the CPU of the sequencer (not shown) is input to the command / input section 44, and the command signal is introduced to the suction output section 46. . The suction output unit 4
In 6, the operation stop signal is sent to the suction pilot solenoid valve 22 to stop the operation of the suction pilot solenoid valve 22, so that the suction valve 32 is turned off (valve closed) in conjunction with the suction pilot solenoid valve 22. State).

As a result, the supply of the negative pressure from the vacuum port 34 to the suction pad (not shown) is stopped (FIG. 4).
(B)).

On the other hand, the command signal input to the command / input section 44 is also derived to the timer section 50 at the same time, and is further introduced to the vacuum break output section 48. In the vacuum break output section 48, an operation signal is derived to the break pilot solenoid valve 24 to operate the break pilot solenoid valve 24, and the break valve 36 is turned on by the pilot pressure supplied from the break pilot solenoid valve 24. State (see FIG. 4C).

As a result, compressed air is supplied to the suction pad via the vacuum port 34, and the suction state of the suction pad to the work is released.

In this case, the timer section 50 starts counting pulses based on the command signal output from the command / input section 44, and reaches a predetermined number of pulses preset by setting means such as a trimmer (not shown). Then, a stop signal is derived to the vacuum break output unit 48. In the vacuum break output unit 48, a stop signal is derived to the break pilot solenoid valve 24, and the break valve 36 is turned off (valve closed state) (FIG. 4).
(C)).

When the workpiece is released from the suction pad, the state changes from the negative pressure state to the atmospheric pressure state. When the atmospheric pressure state is detected by the pressure sensor unit 52 via the pressure sensor 14, the state is switched from the ON state to the OFF state. As a result, the work separation confirmation signal is sent from the sensor output unit 54, and the CPU of the sequencer confirms that the work has been separated from the suction pad. In this way,
The work can be reliably separated from the suction pad.

In this embodiment, the timer unit 50 is provided in the vacuum switch unit 20 and the suction pilot solenoid valve 2 is provided.
2 and sharing the power supply unit 58 with the destruction pilot solenoid valve 24, the number of wiring steps can be reduced to prevent erroneous wiring and the like, and the number of parts can be reduced to reduce the manufacturing cost, as compared with the related art. Can be reduced.

Also, in this embodiment, unlike the prior art in which the vacuum break time is set in advance by an internal program of the sequencer, the vacuum break of the break valve 36 is performed by the timer unit 50 through setting means such as a trimmer. This has the effect that the time can be easily adjusted.

[0035]

According to the present invention, the following effects can be obtained.

That is, by providing a timer section in the vacuum switch section, the number of wiring steps can be reduced to prevent erroneous wiring and the like, and the number of parts can be reduced to reduce the manufacturing cost, as compared with the prior art. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vacuum generating unit according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the vacuum generating unit shown in FIG.

FIG. 3 is a schematic configuration diagram of a vacuum switch unit included in the vacuum generation unit shown in FIG. 1;

FIG. 4 is a time chart showing the operation of the vacuum generating unit shown in FIG.

FIG. 5 is a perspective view of a vacuum generating unit according to the related art devised by the present applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Vacuum generation unit 12 ... Body part 14 ... Pressure sensor 20 ... Vacuum switch part 22 ... Suction pilot solenoid valve 24 ... Release pilot solenoid valve 32 ... Suction valve 36 ... Release valve 50 ... Timer part

Claims (2)

[Claims] 1. A suction electromagnetic device having a main body portion provided with a compressed air supply port and a vacuum port and having a vacuum generation mechanism connected to or inside an external vacuum generation source for switching between a negative pressure state and a positive pressure state. A solenoid valve portion provided with a valve and a vacuum breaking solenoid valve, a vacuum switch portion provided between the vacuum generating mechanism and the vacuum port, and turned on from an off state when a predetermined negative pressure is reached; and The vacuum switch unit includes: when switching from a negative pressure state to a positive pressure state, the vacuum breaking solenoid valve is turned on, and after a predetermined time, the vacuum breaking solenoid valve is controlled from the on state to the off state. A vacuum generating unit, comprising: a timer unit for performing vacuum generation. 2. The vacuum generating unit according to claim 1, wherein the vacuum switch unit is provided with a power supply unit, and the power supply unit is connected to a suction solenoid valve and a vacuum breaking solenoid valve. Characteristic vacuum generating unit.