JPH044343Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vacuum switch for checking the vacuum state of various articles when suctioning and moving them.

[Conventional technology]

The present applicant has provided a vacuum generating device using an ejector pump for adsorbing and moving various articles, etc. (Japanese Utility Model Publication No. 51-44864, Japanese Utility Model Publication No. 61-19915, etc.).

In the above-mentioned vacuum generator, if the suction cup is not moved after confirming the vacuum state in the suction cup, that is, the article suction state, an idling process may occur, which may cause various inconveniences. Therefore, a vacuum switch is used.

Conventionally, provided vacuum switches generally operate a mechanical switch such as a micro switch provided separately by a movable member such as a piston that moves with the vacuum inside the vacuum device (see the above-mentioned Utility Model Publication No. 51-44864). (see official bulletin). In addition, a fluid pressure switch using a pressure-sensitive switching element has been provided (see Utility Model Publication No. 52-20368).

[Problem that the invention attempts to solve]

The former type of conventional vacuum switch described above is time-consuming to manufacture, has many sliding parts, has problems with durability, and may generate sparks when opening and closing the contacts, making it unsuitable for use in flammable work sites. It was dangerous. In addition, the conventional fluid pressure switch using the latter type of pressure-sensitive switching element has a configuration in which the entire pressure-sensitive switching element must be pressurized to make the entire element conductive. It requires high pressure, and problems remain with respect to stability and the time required for conductivity to occur.

In view of the above circumstances, the present invention pressurizes a part of the pressurized conductive rubber with two movable contacts, and connects the pressurized parts with a separate conductive plate to obtain a stable electrical signal and is easy to manufacture. It can be provided at a low cost, and also has a suitable position for the vacuum path (the above-mentioned Utility Model Act
19915)) and is easy to use.

[Means for solving problems]

In order to solve the above problems, the present invention includes a conductive plate supported inside the inlet side of the cylindrical body, a pressurized conductive rubber plate superimposed on the conductive plate, and a pressurized conductive rubber plate supported at appropriate intervals on the diaphragm. The structure includes two movable contacts brought into contact with a piezoconductive rubber plate, and lead wires drawn out from the respective movable contacts.

[Effect]

The vacuum switch S of the present invention is used with its intake port 2 connected to an intake hose 19.

Next, compressed air is supplied to the vacuum generator 17 from the compressed air supply hose 20 . As a result, the air in the suction hose 19 and the suction cup 18 is sucked and discharged, creating a vacuum state.

At the same time, the air inside the vacuum switch S also flows through the air intake port 2.
It is discharged through the ventilation hole 6b, and the diaphragm 8 and the movable contacts 9, 10 are suction-moved to the left in FIG.

As a result, the pressurized conductive rubber 7 is placed at two points, that is,
The contact portions of the movable contacts 9 and 10 are pressurized and become conductive.

Therefore, the lead wires 13 and 14 connect the movable contact 9, the pressurized portion of the pressurized conductive rubber 7 by the movable contact 9, the conductive plate 5, the pressurized portion of the pressurized conductive rubber 7 by the movable contact 10, and the movable contact 10. This creates a closed circuit through which a stable electrical signal can be obtained by applying partial pressure.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

The cylindrical main body 1 has a small-diameter intake port 2 at one end, a medium-diameter section (X) approximately at the center, and a large-diameter section (Y) at the other end.

As a result, stepped portions 3 and 4 are formed inside, and a female thread 25 is further provided on a part of the inner peripheral surface of the large diameter portion Y.

Next, the conductive plate 5 is supported inside the cylindrical body 1 on the side of the intake port 2, specifically, in the middle diameter portion X.

In the illustrated embodiment, the conductive plate 5 is supported by a receiving frame 6.

That is, the receiving frame 6 is made of electrically insulating material,
The base portion 6a has a diameter that matches the middle diameter portion X, and furthermore, a ventilation hole 6b is provided at an appropriate position in the base portion 6a, and a recess 6c is formed on the front side in the distal direction and has a smaller diameter than the base portion 6a. A conductive plate 5 is supported within the space 6c.

Furthermore, a pressurized conductive rubber plate 7 is superposed on the conductive plate 5. The pressurized conductive rubber plate 7 has the property that no pressure is applied or the non-pressure part is in an insulating state, and a predetermined pressurized state or a predetermined pressurized part is in a conductive state. Products (product names JSR PCR 101, JSR PCR 105) etc. are used.

Next, two movable contacts 9 and 10 are provided which are supported by the diaphragm 8 at appropriate intervals and brought into contact with the pressurized conductive rubber plate 7.

The diaphragm 8 and movable contacts 9, 10
The diameter of the diaphragm 8 is made to be the same as the large diameter portion Y inside the cylindrical body 1, and is sized to fit the stepped portion 4,
It can be attached using the stepped portion 4.

That is, after fitting the diaphragm 8 to the stepped portion 4 from the direction of the large diameter portion Y, it is held down by a washer 11, and further, a hollow holding bolt 12 is used to clamp and fix the diaphragm 8 between the stepped portion 4 and the stepped portion 4 via the washer 11.
It is attached by screwing into the female thread 25 of the hollow body 1.

Next, by pulling out the lead wires 13 and 14 from the respective movable contacts 9 and 10, the vacuum switch S of the present invention is completed.

In the figure, reference numeral 15 indicates a communication hole with the atmosphere provided in the holding bolt 12.

Note that the movable contacts 9 and 10 are connected to the diaphragm 8.
Since it is difficult to directly fix the diaphragm 8 to
The movable contacts 9 and 10 are provided through a holding member 16 which also serves to position the movable contacts 9 and 10 provided at the center.

FIG. 2 shows a usage diagram.

In the figure, 17 is a vacuum generator using an ejector pump, 18 is a suction cup, 19 is an intake hose, 2
0 is a compressed air supply hose.

The vacuum switch S of the present invention is used by connecting the intake port 2 to the intake hose 19, as shown in the drawing.

In the present invention having the above configuration, when air is taken in from the intake port 2, the diaphragm 8 and the movable contacts 9, 10 are suctioned and moved toward the pressurized conductive rubber 7 side, and the movable contacts 9, 1
0 pressurizes the pressurized conductive rubber 7 between it and the conductive plate 5. As a result, the pressurized part of the pressurized conductive rubber 7 becomes conductive, and pressure is applied by the movable contact 9, the pressurized part by the movable contact 9 of the pressurized conductive rubber 7, the conductive plate 5, and the movable contact of the pressurized conductive rubber 7. A closed circuit is formed between the lead wires 13 and 14 via the movable contact 10, and the required electrical signal can be obtained.
FIG. 3 shows another embodiment in which the movable contacts 9 and 10 are constructed so that they can move freely.

That is, a conductive spring 28,
29, and a return spring 30 is interposed between the receiving frame 6 and the holding member 16 of the diaphragm 8. In the figure, 31 is an insulating material, and 32 is an outside air communication hole. Therefore, the movable contacts 9 and 10 can move more quickly than in the embodiment shown in FIG. 1, and conduction and release can be performed accurately.

In addition, although the above-mentioned embodiment is for obtaining so-called ON/OFF signals, it is also possible to configure the device to obtain signals at a required degree of vacuum.

That is, in the above configuration, the movable contacts 9, 1
0 and the fixed side, for example, the cylindrical main body 1 and the receiving frame 6 side, a spring or the like whose elastic force can be adjusted from the outside may be provided.

As a result, by increasing the resiliency of the spring, it is possible to make adjustments such as preventing a closed circuit unless a high degree of vacuum is achieved.

[Effect of idea]

According to the present invention, a part of the pressurized conductive rubber is pressurized by a movable contact, and the pressurized parts are connected by a separately provided conductive plate, so it is possible to obtain a stable electric signal, and it is easy and inexpensive to manufacture. It can be used safely even in flammable work sites because it does not have any so-called sliding parts, improves durability, and does not generate sparks at the contact points.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the main part, FIG. 2 is a diagram of the state of use, and FIG. 3 is a longitudinal sectional view of the main part showing another embodiment. DESCRIPTION OF SYMBOLS 1... Cylindrical main body, 2... Inlet port, 5... Conductive plate, 7... Pressurized conductive rubber plate, 8... Diaphragm, 9, 10... Movable contact, 13, 14... Lead wire.

Claims (1)

[Scope of utility model registration request] a conductive plate supported inside the cylindrical body on the intake port side;
It consists of a pressurized conductive rubber plate superimposed on the conductive plate, two movable contacts supported at appropriate intervals on the diaphragm and brought into contact with the pressurized conductive rubber plate, and lead wires drawn out from each of the movable contacts. A vacuum switch characterized by: