JPH0429851Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an air filter used in a vacuum suction device.

[Prior art] As a conventional vacuum suction device, for example, the
There is one described in the -88582 publication. As shown in FIG. 4, this vacuum suction device includes negative pressure generating means 1.
and the suction pad 2 are connected via piping 3. In this case, if the negative pressure generating means 1 and the suction pad 2 are directly connected through the piping 3, the dust contained in the air sucked from the suction pad 2 will be transferred to the negative pressure generating means 1.
Otherwise, dust may be emitted from the negative pressure generating means 1, deteriorating the working environment. Therefore, a filter 4 is installed in the middle of the pipe 3 to remove dust.

Additionally, if the filter 4 is installed, the suction force of the suction pad 2 will decrease if the filter 4 becomes clogged, so there is a risk that the plate may fall when the suction pad 2 holds the plate and transports it. . Therefore, a vacuum switch (detection means) 5 is installed closer to the suction pad 2 than the filter 4 to detect a decrease in the degree of vacuum on the suction pad 2 side.

Note that the negative pressure generating means 1 is configured to flow compressed air supplied from the compressed air supply source 6 into the main passage 1a at high speed, and generate negative pressure in the branch passage 1b by this high-speed flow. There is.

[Problems to be solved by the invention] In the conventional vacuum suction device described above, since the filter 4 and the vacuum switch 5 are provided separately,
Each requires a housing, which poses the problem of increasing the size of the vacuum suction device. Further, there was a problem in that the filter 4 and the housing 5 needed to be connected, and the connection work was time-consuming.

[Purpose of the invention] This invention was made to solve the above problems, and provides an air filter for a vacuum suction device that can reduce the size of the device and reduce connection work. The purpose is to

[Configuration of the device] In order to achieve the above object, this device forms a filter storage chamber and a cylinder chamber inside the filter body, and connects the internal space of the filter storage chamber to the suction side. A filter is installed which divides the space into an inlet space and an inflow side space, and a piston is slidably provided at one end of the cylinder chamber and is biased from the other end of the cylinder chamber toward the one end by an elastic member. The filter body further includes a detection means for detecting that the piston has moved a predetermined distance against the biasing force of the elastic member, a communication path that communicates the inflow side space with the other end of the cylinder chamber, and one end of which is connected to the filter body. A suction hole that opens on the outside of the filter body and has the other end facing the suction side space, and a filter body that has one end that opens on the outside of the filter body and the other end that faces the inlet side space. An inlet hole opening on the inner surface of the tube is provided respectively.

[Embodiment] An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 11 in the figure is a filter main body. This filter body 11 includes a container 12 and an upper surface 12 of this container 12.
A is provided with a lid 14 screwed and fixed via a gasket 13 to a. On the upper surface 12a of the container 12, a storage recess 15 (filter storage chamber) and a cylinder hole (cylinder chamber) 16 are formed spaced apart from each other, each extending toward the lower surface 12b. The packing 13 is arranged so as to surround each opening of the recess 15 and the cylinder hole 16. Therefore, when the lid 14 is fixed, the recess 15 and the cylinder hole 16
will be sealed from the outside. but,
There is no gasket 13 between the recess 15 and the cylinder hole 16, and between them there are the upper surface 12a of the container 12, the lower surface 14a of the lid 14, and the gasket 13.
A communicating path 17 is formed by this, and this communicating path 17
The recess 15 and the cylinder hole 16 are communicated with each other.

Furthermore, a circular mounting recess 18 is formed on the bottom surface of the recess 15 . A lower end portion of a cylindrical filter 19 is fitted into the mounting recess 18 . This filter 19 is made of sintered metal or fiber with a porous chamber, and its upper part is
2, and its protruding upper end is the lid 1.
4 is fitted into a fixing recess 20 formed on the lower surface 14a of the housing. As a result, the internal space of the storage recess 15 is divided into an inner space (suction side space) 21 located inside the filter 19 and an outer space (inflow side space) 22 located outside the filter 19.

Note that the communication passage 17 allows the outer space 22 and the cylinder hole 16 to communicate with each other.

On the other hand, a piston 24 is slidably and airtightly provided at the lower end of the cylinder hole 16, and is urged by a spring (elastic member) 23 from the upper end to the lower end. A rod 24a is provided on the upper end surface of the piston 24. The upper end of this rod 24a slidably and airtightly penetrates the lid 14, and is connected to a switch (detection means) fixed to the upper surface 14b of the lid 14 via a bracket 25.
26 movable contacts 26a. and,
When the rod 24 pushes the movable contact 26a upward by a predetermined distance, the switch 26 is activated and sends a predetermined signal to a control device (not shown).

Further, a projection 27 having a circular cross section is formed on the upper surface 14b of the lid 14 so that its axis coincides with the center line of the filter 19. A suction hole 28 extending to the lower surface 14a of the lid 14 is formed in the center of the upper end surface of the projection 27. This suction hole 28 is
is connected to negative pressure generating means (both not shown) via piping connected to the protrusion 27. Furthermore, a protrusion 29 is provided on one side 12c of the container 12.
is formed. On the tip surface of this protrusion 29,
An inflow hole 30 is formed that reaches the inner peripheral surface of the storage recess 15 facing the outer space 22. This inflow hole 30
is a device that uses negative pressure, such as a suction pad, through a pipe connected to the protrusion 29 (none of these are shown)
connected to.

In the air filter having the above configuration, when a negative pressure generating means is connected to the suction hole 28, negative pressure is created in the inner space 21 and the outer space 22, and devices such as suction pads are vacuum-suctioned through the inflow hole 30. . The vacuum-suctioned air flows into the outer space 2 through the inflow hole 30.
2 and is removed by a filter 19 when passing from the outer space 22 to the inner space 21. and,
The dust-removed air is passed from the inner space 21 to the suction hole 28
to the negative pressure generating means side. Moreover, when the outer space 22 becomes negative pressure, the communication passage 1 is connected to the outer space 22.
The inside of the cylinder hole 16 communicated through the cylinder hole 7 becomes negative pressure. As a result, the piston 24 moves upward against the spring 23. In this case, if the negative pressure in the cylinder hole 16 is above a predetermined value, the rod 24a operates the switch 26. Then, the switch 26 issues a signal to the control device indicating that the cylinder hole 16 has reached a predetermined negative pressure. As a result, the control device causes the transport device or transport robot to perform a normal transport operation. On the other hand, if the filter 19 is clogged or the suction pad does not suction the plate material, the inside of the cylinder hole 16 will not reach the desired negative pressure. Therefore, the rod 24a does not operate the switch 26, and the switch 26 sends a signal to the control device that the inside of the cylinder hole 16 has not reached a predetermined negative pressure. As a result, the control device stops the transport device and the like, and activates warning means such as a warning buzzer.

Here, in the air filter in the vacuum suction device described above, since the filter 19, the switch 26 as a detection means, and the piston 24 for operating the switch 26 are provided in the filter body 11,
Each filter body 1 does not require a housing.
1 is enough. Therefore, it is possible to downsize the vacuum suction device. Moreover, filter 1
Since the outer space 22 partitioned by 9 and the cylinder hole 16 are communicated with each other through the communication passage 17 formed inside the filter body 11, there is no need to connect them. This can reduce the connection work.

In the above embodiment, the switch 26 is actuated by the rod 24a provided on the piston 24, but other structures may be used. For example, a permanent magnet is fixed to the upper end surface of the piston 24, a proximity switch is installed on the lower surface 14a of the lid 14 facing the permanent magnet, and when the piston 24 moves up a predetermined distance, the proximity switch is activated by the permanent magnet. You can do it like this. In this case, of course, the rod 24a becomes unnecessary.

Further, in the above embodiment, the filter 19
Although it is formed into a cylindrical shape, it may also be formed into a simple flat plate shape. However, when the filter 19 is formed in a cylindrical shape, if the suction hole 28 is formed so that its center line coincides with the center line of the filter 19, as in the above embodiment, there will be more space inside the filter 19. A plurality of filters can be arranged concentrically, thereby increasing the dust removal effect. Moreover, even if a plurality of filters are arranged, since they are arranged concentrically, the size of the filter body does not increase. In addition, when installing a plurality of filters, it is desirable to use filters with finer meshes for inner filters.

[Effects of the invention] As explained above, according to the air filter in the vacuum suction device of this invention, a filter storage chamber and a cylinder chamber are respectively formed inside the filter body, and the filter is stored in the filter storage chamber. A filter is installed to divide the internal space of the chamber into a suction side space and an inflow side space, and a piston is installed at one end of the cylinder chamber and is urged by an elastic member from the other end of the cylinder chamber toward the one end. is slidably provided, and furthermore, a detection means for detecting that the piston has moved a predetermined distance against the biasing force of the elastic member is provided in the filter body, and the inflow side space and the other end of the cylinder chamber are communicated with each other. a communication path, one end of which opens on the outer surface of the filter body;
A suction hole whose other end opens on the inner surface of the filter body facing the suction side space, and an inflow hole whose one end opens on the outer surface of the filter body and the other end opens on the inner surface of the filter body facing the inlet side space. Since the filter and the detection means are each provided with a housing, it is not necessary to install a housing for each of the filter and the detection means, and only the filter body is sufficient. Therefore, it is possible to downsize the vacuum suction device. Furthermore, since the filter and the detection means are connected within the filter body, the work of connecting them becomes unnecessary. Therefore, effects such as being able to reduce connection work can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention, with Figure 1 being a partially cutaway front view, and Figure 2 being a partially cutaway front view.
The figure is a partially cutaway plan view, FIG. 3 is a plan view with the lid removed, and FIG. 4 is a schematic configuration diagram showing an example of a conventional vacuum suction device. 11... Filter body, 12... Container, 14...
Lid, 15...Storage recess (storage chamber), 16...Cylinder chamber, 17...Communication path, 19...Filter, 2
1... Inner space (suction side space), 22... Outer space (inflow side space), 23... Spring (elastic member), 2
4...Piston, 26...Switch (detection means),
28... Suction hole, 30... Inflow hole.

Claims (1)

[Scope of utility model registration request] In an air filter in a vacuum suction device installed between a negative pressure generating means and a device vacuumed by the negative pressure generating means, a filter storage chamber and a cylinder chamber are respectively formed inside the filter body. A filter is installed in the filter storage chamber to divide the internal space of the filter storage chamber into two into a suction side space and an inflow side space, and an elastic member is provided at one end of the cylinder chamber to separate the inner space from the other end of the cylinder chamber. A piston is slidably provided in the filter body and is biased toward one end, and further includes a detection means for detecting that the piston has moved a predetermined distance against the biasing force of an elastic member; a communication path that communicates the inflow side space with the other end of the cylinder chamber; and a suction hole that has one end opening on the outer surface of the filter body and the other end that opens on the inner surface of the filter body facing the suction side space. An air filter in a vacuum suction device, characterized in that an inflow hole is provided at one end opening to the outer surface of the filter main body and at the other end opening to the inner surface of the filter main body facing the inflow side space.