JPH04343655A - Silencer for air type polishing device - Google Patents

Abstract

PURPOSE:To fit a silencer for reducing the noise of an air type polishing device used for finishing the rough face of a machined portion after welding. CONSTITUTION:A silencer 5 is fitted to the air blowout port 4 of an air type polishing device. The high-pressure air is discharged through discharge paths changed in sequence via multiple air guide means constituted of the outer container 6 of the silencer 5, the first cylinder 7 and the second cylinder 10 without being directly discharged from the air blowout port 4. The pressure of the air is reduced in sequence through different discharge paths, thus the noise discharged to the outside from the air-type polishing device can be reduced.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise reduction device for an air polishing device that is attached to an air polishing device used for finishing work after welding.

0002

2. Description of the Related Art When assembling various mechanical devices, welding is performed to join the constituent members in a desired positional relationship. In this case, if welding continues, the processed portion will remain rough, so an air polisher is used to finish the surface.

FIG. 5 shows the appearance of an air polishing device used for such purposes. A high-pressure air supply section is formed in a cylindrical main body 1 that is partially bent.
At one end there is an air pipe 2 for introducing high pressure air.
The other end is connected to a bowl-shaped polishing section 3 that holds a polishing disk that is rotated at high speed by high-pressure air supplied from the high-pressure air supply section. Further, an air outlet 4 is provided in a part of the side wall of the main body 1, for example, near a bent portion.

Using an air-type polishing device having such a structure, the polishing section 3 is brought into contact with the welded part to be polished, and the polishing disk is rotated at high speed (
For example, 8,000 rpm), the rough surface is polished to a flat surface. While the polishing desk is rotating at high speed, the air outlet 4
High pressure air is released from.

[0005]

[Problems to be Solved by the Invention] However, in the conventional air polishing equipment, when high-pressure air is released from the air outlet during the polishing process, the high-speed rotation sound of the polishing desk is extremely strong. The problem is that the high-pitched sound emitted creates a lot of noise in the surrounding area.

[0006] The sound pressure of the high-speed rotation sound emitted is as high as 98 db, for example, which causes a great deal of trouble to surrounding workers and passersby. As a result, the people around them can no longer speak without raising their voices, the noise can become so loud that they become irritated, and in some cases, they can suffer from hearing loss unless they use earplugs.

The present invention was made in response to the above-mentioned problems, and it is an object of the present invention to provide a noise reduction device for an air-type polishing machine that reduces noise when the polishing desk rotates at high speed. be.

[Configuration of the invention]

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a silencing device that is attached to an air blowing section of an air-type polishing device, and which suppresses the course of high-pressure air discharged from the air blowing section. The present invention is characterized by comprising a plurality of air guide means that sequentially change directions in different directions, and an air amount adjustment means that can adjust the amount of air released from the last air guide means through which high-pressure air passes.

0010

[Operation] The cause of the loud noise is that high-pressure air is released directly from the air outlet. Therefore, without directly releasing high-pressure air from the air outlet, by sequentially releasing high-pressure air in different release paths through multiple air guide means, the pressure of the high-pressure air can be reduced sequentially as the release paths differ. . Further, by adjusting the amount of air released from the last air guide means using the air amount adjusting means, the flow rate of the high pressure air can be adjusted. Therefore, the pressure of the air discharged to the outside from the air polishing device is considerably reduced, so noise can also be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view illustrating an embodiment of the silencer for an air-type polishing apparatus according to the present invention, in which 1 is a cylindrical body in which a high-pressure air supply portion is formed and a part thereof is bent, and 2 is a main body. 1
An air pipe 3 is connected to one end for introducing high-pressure air, and 3 is a bowl that is connected to the other end of the main body 1 and holds a polishing disk that is rotated at high speed by high-pressure air supplied from the high-pressure air supply section. It is a polished part of the shape. Also,
Reference numeral 4 denotes an air outlet provided in a part of the side wall of the main body 1, for example, near a bent portion.

Reference numeral 5 denotes a silencer which has a cylindrical outer container 6, and as shown in an enlarged view in FIG. 7A is open, and the other end 7B opposite to this one end 7A is closed, and a plurality of exhaust ports 8 are provided around the other end 7B.
is formed. A first wall surface 6A through which the cylinder 7 is inserted is provided at one end of the outer container 6, and a second wall surface 6B in which a plurality of exhaust ports 9 are formed is provided at the other end, as shown in FIG. It is being

A second cylindrical body 10 is disposed inside the outer container 6 so as to cover the first cylindrical body 7. This cylinder 1
0 has one end 10A open and this one end 10
The other end 10B in the direction opposite to A is closed;
0B is superimposed on the other end 7B of the first cylindrical body 7. Further, the cylindrical body 10 is arranged so that a gap 11 is formed between one end 10A of the second cylindrical body 10 and the first wall surface 6A of the outer container 6.

Further, the adjustment plate 13 having a plurality of exhaust ports 12 formed therein is rotatable in the direction of the arrow through a screw member 14 so as to cover the second wall surface 6B of the outer container 6. can be attached to. As shown in FIG. 4, the exhaust port 9 formed on the second wall surface 6B and the exhaust port 1 of the adjustment plate 13
2 are concentrically arranged, and each of them is formed, for example, eight pieces.

As shown in FIG. 2, the silencer 5 having such a structure has the mounting member 15 mounted so that one end 7A of the first cylindrical body 7 covers the air outlet 4 of the air polishing device. It is attached to the main body 1 via.

Next, the operation of this embodiment will be explained.

When the air-type polishing device is driven to rotate the polishing disk of the polishing section 3 at high speed using high-pressure air, as shown in FIG.
The high pressure air generated as shown in
As shown by the arrow, one end 7 of the first cylindrical body 7 of the silencer 5
A is released into the cylinder 7. This high pressure air is
After traveling straight through the cylinder body and returning after being reflected at the other end 7B, the gas is discharged from the exhaust port 8 to the outside of the cylinder body 7, thereby changing its course by 90 degrees. By performing the first course change in this way, the pressure of the high-pressure air can be lowered a little.

Next, the air is reflected by the inner wall surface of the second cylindrical body 10, so that its course is further changed by 90 degrees. This second course change allows the air pressure to be lowered a little further.

[0020] Subsequently, after the air travels inside the cylinder 10, it is reflected by the first wall surface 6A of the outer container 6, and as a result,
Furthermore, its course is changed by 90 degrees. This third course change allows the air pressure to be lowered a little further.

Next, the air travels along the gap 11 and is then reflected by the inner wall surface of the outer container 6, thereby changing its course further by 90 degrees. This fourth course change allows the air pressure to be lowered a little further.

After the air whose path has been changed for the fourth time travels along the inner wall surface of the outer container 6, as shown by the arrow in FIG. 13 and is discharged to the outside of the silencer 5. When air passes through the exhaust port 9 in this way, the adjustment plate 1
3 by the screw member 14 to adjust the concentric matching state of the exhaust port 9 and the exhaust port 12,
Since the amount of air passing through these exhaust ports 9 and 12 can be changed, the flow rate of air can be adjusted.

As described above, according to this embodiment, the high-pressure air generated in the air polishing device is not directly released to the outside, but is released into the silencer, and the air is discharged into the silencing device.
Since the discharge path is sequentially changed to different directions via a plurality of air guide means constituted by the second cylinder 10 and the like, the pressure of the air is sequentially lowered each time the discharge path changes. Further, since the amount of air released from the silencer is adjusted by the adjustment plate 13, the flow rate of high-pressure air can be adjusted. As a result, the pressure of the air discharged to the outside from the air-type polishing device during polishing operations is considerably reduced, and therefore noise can also be reduced. As an example, the conventional noise level of 98 db was reduced to 78 db.

[0024] As a result, there is less inconvenience to surrounding workers, passersby, etc., so conversations around the user become smoother, and the user does not become irritated or suffer from hearing loss. Since the muffling device in this embodiment can be configured to be small and lightweight, the same effect can be obtained even when it is applied not only to an air-type polishing device but also to other noise sources. Note that the specific structure shown in this embodiment that acts as a guide means is one example, and is not limited to this structure. For example, the air guide path is not limited to the cylindrical body, and the number of changes in the air release path can be arbitrarily set within the range where the effect can be obtained.

[0025]

As explained above, according to the present invention, since the present invention is equipped with a silencing device that sequentially lowers the pressure by changing the direction of the high-pressure air discharge path multiple times, Emitted noise can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a silencer for an air polishing apparatus according to the present invention.

FIG. 2 is a sectional view showing the structure of the silencer according to the present embodiment.

FIG. 3 is a side view showing the structure of the silencer according to the present embodiment.

FIG. 4 is a plan view showing the main components of the silencer according to the present embodiment.

FIG. 5 is a perspective view showing a conventional air polishing device.

[Explanation of symbols]

3 Polishing section 4 Air outlet 5. Silencer 6 Outer container 7 First cylinder 8, 9, 12 Exhaust port 10 Second cylinder 13 Adjustment plate

Claims (1)

[Claims] 1. A silencer attached to an air blowing section of an air polishing device, comprising a plurality of air guide means for sequentially changing the course of high-pressure air discharged from the air blowing section to different directions; 1. A noise muffling device for an air polishing apparatus, comprising: an air amount adjusting means capable of adjusting the amount of air released from the last air guide means through which the air-polishing device passes.