JPH0339636Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention prevents dirt, dust, etc. (hereinafter referred to as "dust") from sliding between the hole member and the shaft member inserted into the hole member. This invention relates to a dust seal device that prevents dust from entering.

[Conventional technology]

When the shaft member is inserted into the hole member and the two are made to slide, the hole member is provided with a seal ring as a dust seal device at the end of the side from which the shaft member protrudes. This seal ring is in close contact with the outer peripheral surface of the shaft member to prevent dust from entering the sliding portion between the hole member and the shaft member. in general,
There are some seal rings in which the part that is in close contact with the outer circumferential surface of the shaft member is in the shape of a brush, or in which the part is in the form of a rubber lip.

[Problem that the invention attempts to solve]

Conventional dust seal devices prevent dust from entering the sliding portion between the shaft member and the hole member by wiping off dust that has adhered to the shaft member with a seal ring.

However, since the dust that has been wiped off remains attached to the seal ring, the dust attached to the seal ring is damaged by the repeated back and forth sliding between the shaft member and the hole member. There is a risk that it may enter the contact area between the shaft member and the sliding part, that is, the sliding part. Once the dust enters the contact area between the seal ring and the shaft member, there is a problem in that the dust directly enters the sliding part between the shaft member and the hole member and prevents smooth sliding between the two. Ta.

This idea was made to solve the above problems, and it is a dust seal device that can prevent dust from entering the sliding part between the shaft member and the hole member without using a seal ring to wipe off the dust. The purpose is to provide

[Means for solving problems]

The dust seal device according to this invention is provided at the end of the hole member into which the shaft member is inserted, on the side from which the shaft member projects, and includes a suction source and a main passage that communicates with the suction source and surrounds the shaft member. and a plurality of branch passages branching from the main passage toward an outer peripheral surface of the shaft member, the openings of the plurality of branch passages surrounding the shaft member along the outer peripheral surface thereof, and the suction source; A filter that captures dust is provided in a suction passage that includes a main passage and a branch passage.

[Effect]

In this invention, the dust on the shaft member that slides on the hole member is sucked into the opening of the dust seal device and removed in advance, so that dust does not enter the sliding portion between the shaft member and the hole member.

In addition, since dust is removed by suction, unlike conventional dust seal devices that wipe off dust with a seal ring, the device itself takes in dust and allows it to enter the sliding part between the shaft member and the hole member. Never.

Furthermore, once the dust is sucked in, it is captured by the filter, so that it does not re-adhere to the shaft member.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, 1 is a slide shaft which is a shaft member, and 2 is a slide plotter which is a hole member.
The slide shaft 1 and the slide plotter 2 slide when the slide shaft 1 is inserted into the slide block 2. 3 is a sliding part between the two.

A dust seal device 4 is attached to the end of the slide block 2 on the side from which the slide shaft 1 projects. The dust sealing device 4 includes an ejector 5 that is a suction source, a main passage 6 communicating with the suction port 5a of the ejector 5 and surrounding the slide shaft 1, and a branch branching from the main passage 6 toward the outer peripheral surface of the slide shaft 1. A plurality of branch passages 7 are provided.

As shown in FIG. 2, the openings 8 of the plurality of branch passages 7 surround the slide shaft 1 along its outer peripheral surface. In addition, the ejector 5 and main passage 6 in FIG.
A filter 9 is provided in the suction passage 11 including the branch passage 7 and the filter 9 is attached to the suction port 5a of the ejector 5.

In the above configuration, when the slide shaft 1 and the slide block 2 slide, when compressed air is introduced from a compressor (not shown) into the compressed air inlet 5b of the ejector 5, the suction action of the ejector 5 causes the slide to slide. Dust adhering to the outer peripheral surface of the shaft 1 is sucked together with air into the branch passage 7 and the main passage 5 through the opening 8.

The suctioned dust and air are captured by the filter 9, and the air is exhausted from the exhaust port 5c together with the compressed air introduced into the compressed air inlet 5b.

Therefore, the dust on the slide shaft 1 that slides on the slide block 2 is suctioned and removed in advance, so that dust does not enter the sliding section 3 between the slide shaft 1 and the slide block 2. . In addition, since dust is removed by suction, unlike conventional dust seal devices that wipe off dust with a seal ring, the device itself is the cause of dust entering the sliding portion 3 between the slide shaft 1 and slide block 2. It never happens. moreover,
Since the suctioned dust is captured by the filter 9, it does not adhere to the slide shaft 1 again.

Here, as shown in FIG. 3, together with the dust seal device 4 of this embodiment, for example, the slide shaft 1
A better dust removal effect can be obtained by using an annular brush 10 in contact with the outer circumferential surface of the slide shaft 1 to actively float the dust stuck to the slide shaft 1 and then suctioning it from the opening 8. can be expected.

In this example, the ejector 5 having a vacuum generation function shown in FIG. 1 was used as the suction source.
This idea is not limited to this. Even if a vacuum pump other than the ejector 5 is used as the suction source, the same effects as in this embodiment can be obtained.

Furthermore, the sliding portions of the shaft member and the hole member may be screws, or the shaft member and the hole member may slide together via balls, rollers, or the like.

FIG. 4 shows an example in which the dust seal device 4 is applied to an air cylinder.

In the figure, 20 is a cylinder tube, 21
is a piston, 22 is a piston rod, 23 is a right cylinder head, and 24 is a left cylinder head. A dust seal device 4 is provided on the right cylinder head 23 and the left cylinder head 24. Since the right cylinder head 23 and the left cylinder head 24 have the same structure, the right cylinder head 23 will be explained below.

An ejector 5 is built into the right cylinder head 23, and the compressed air inlet 5b of the ejector 5
is in communication with a right air chamber 25 formed on the right side of the piston 21. That is, when the air cylinder is operated, a part of the compressed air introduced into the right air chamber 25 is introduced into the ejector 5.

Here, the piston rod 22 is fixed by a side plate 26, and the air port 27
When compressed air is introduced into the right air chamber 25 from
The right cylinder head 23 moves to the right as indicated by arrow 28. At this time, the piston rod 22 is
The dust in the portion that slides on the right cylinder head 23 is removed by suction from the opening 8 of the dust seal device 4 in advance. Therefore, dust does not enter the sliding portion 3 between the piston rod 22 and the right cylinder head 23.

[Effect of idea]

As described above, according to this invention, dust attached to the shaft member can be removed by suction rather than being wiped off, thereby preventing dust from entering the sliding part between the shaft member and the hole member. . Further, since the suctioned dust is captured by the filter, it does not adhere to the shaft member again.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of this invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view showing another embodiment of this invention, and Fig. 4 is a sectional view showing an embodiment of this invention. FIG. 7 is a sectional view showing still another embodiment of the invention. 1... Shaft member, 2... Hole member, 3... Sliding part,
4...Dust seal device, 5...Suction source, 6...
Main passage, 7...branch passage, 8...opening, 9...filter, 11...suction passage.

Claims (1)

[Scope of utility model registration request] A dust seal device is provided at the end of the hole member into which the shaft member is inserted, on the side from which the shaft member projects, and prevents dust from entering the sliding portion between the shaft member and the hole member, a suction source, a main passage communicating with the suction source and surrounding the shaft member, and a plurality of branch passages branching from the main passage toward an outer peripheral surface of the shaft member, and openings of the plurality of branch passages. A dust sealing device, wherein a filter for capturing dust is provided in a suction passage that surrounds the shaft member along its outer peripheral surface and includes the suction source, a main passage, and a branch passage.