JP2020180761A - Sound proofing device - Google Patents

Abstract

To provide a sound proofing device for use in a water removal device or a dust collector, capable of allowing a worker to easily carry out installation work and cleaning work, and of preventing a cost increase, while achieving a sufficient sound proofing effect.SOLUTION: The sound proofing device comprises: a first sound proofing cover 9 disposed over a conveying surface, upstream in a direction of conveying a treating object relative to a unit cover 3 encasing an air ejection unit 4 ejecting air toward the treating object; and a second sound proofing cover 10 disposed over the conveying surface, downstream relative to the unit cover 3. Each of the first and the second sound proofing covers 9, 10 comprises a sound absorption material on an inner wall surface thereof. In addition, the first sound proofing cover 9 having a shape and a size for covering a circumference of an opening of an inlet 3a of the unit cover, and the second sound proofing cover 10 having a shape and a size for covering a circumference of an opening of an outlet 3b of the unit cover 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a soundproofing device used for a water removal device or a dust removing device for blowing off water droplets and dust adhering to the surface of an object to be treated by compressed air.

Conventionally, a device for blowing off water droplets on the surface of an object to be treated by the jetting force of compressed air has been known.
As an apparatus of this type, for example, there is a water removal apparatus shown in FIG.
This water removal device supports a net conveyor 2 between frames 1a and 1a provided on the upper part of the device main body 1, and transports an object to be processed on the transport surface 2a of the net conveyor 2. ..
Further, the frame 1a is provided with a unit cover 3 that can cover or release the transport surface 2a of the net conveyor 2. The unit cover 3 has an inlet 3a and an outlet 3b that allow passage of the object to be transported on the transport surface 2a to be opened, and an air injection unit 4 is mounted therein. A plurality of air injection nozzles (not shown) are attached to the air injection unit 4, and the air injection nozzles inject compressed air guided from a compressed air source (not shown), and the injection port swivels due to the injection reaction force. It is a thing.

Further, an air injection unit 5 is provided below the transport surface 2a, and the air injection unit 5 is also provided with a plurality of air injection nozzles (not shown).
Then, if this water removal device is operated with the unit cover 3 closed, compressed air is injected from the air injection nozzles of the upper and lower air injection units 4 and 5 toward the object to be processed on the transport surface 2a. Water droplets adhering to the surface of the object to be treated can be blown off.

Further, a soundproof box 7 is attached to the device main body 1 so as to be openable and closable so that the unit cover 3 can be covered and released.
The reason why such a soundproof box 7 is provided is as follows.
While the water removal device is in operation, compressed air is injected from a large number of air injection nozzles. Therefore, the injection sound of compressed air, the turbulent sound after injection, the collision sound of air with the object to be processed, the vibration sound of the object to be processed on the transport surface 2a, etc. are generated, which become a noise source. is there. This noise was very unpleasant for workers who had to work around the water removal device and was sometimes a health hazard. Therefore, the unit cover 3 is covered with the soundproof box 7 to reduce ambient noise.
Reference numeral 6 in the drawing is a handle for adjusting the height position of the air injection unit 4 in the unit cover 3.

The soundproof box 7 is made of metal such as stainless steel, has a size for covering the unit cover 3, and has an entrance / exit for an object to be processed, and a sponge-like sound absorbing material (not shown) is adhered to the inner wall surface thereof with an adhesive. is there. The sound absorbing material was designed to absorb the noise generated in the unit cover 3.
The compressed air injected from the air injection units 4 and 5 can blow off dust and the like adhering to the surface of the object to be processed which is conveyed by the net conveyor 2. That is, the same configuration as the water removal device described above can also be used as a dust removal device. Even in such a dust removing device, the same noise as that of the water removing device is generated. Therefore, the noise is reduced by providing the soundproof box 7.
Reference numeral S in the drawing is a soundproof sheet made of urethane rubber in the shape of a curtain, which is provided at the inlet 3a and outlet 3b of the unit cover 3 and the inlet / outlet of the soundproof box to reduce noise leakage.

Japanese Unexamined Patent Publication No. 2005-345018

The soundproof box 7 described above is provided on the frame 1a of the apparatus main body 1 so as to be openable and closable, and covers the unit cover 3 in a closed state. That is, the soundproof box 7 must have a size capable of completely covering the unit cover 3. In particular, since the handle 6 is provided on the upper surface of the unit cover 3, the height of the soundproof box 7 must be higher than that of the handle 6. Therefore, the soundproof box 7 had to be made considerably large.

Further, when cleaning the inside of the unit cover 3 and the transport surface 2a that are openably attached to the device main body 1, the unit cover 3 must be opened from the device main body 1. In this way, when opening / closing the unit cover 3 or cleaning the inside, the soundproof box 7 must be kept open so as not to interfere with the work.
Further, the sound absorbing material in the soundproof box 7 may be blown off by the compressed air, and water droplets or dust ejected from the inlets / outlets 3a and 3b of the unit cover 3 and the exhaust port 8 may adhere. If they are left unattended, they may cause mold to grow, so it is necessary to clean the inside of the soundproof box 7. However, since the soundproof box 7 is attached to the device main body 1, the inside must be cleaned while being opened from the device main body 1.

However, as described above, since the soundproof box 7 has a large size and weight, there is a problem that the opening / closing work is not easy.
Further, when cleaning the inside of the soundproof box 7, there is a problem that the device main body 1 and the unit cover 3 get in the way and it is difficult to perform the work.
Further, in order to make the large soundproof box 7 openable and closable with respect to the device body 1 and to keep the open state, a stopper mechanism, a damper mechanism, etc. are required, and the mounting structure of the soundproof box 7 is complicated. There was also the problem that it would cost more.

An object of the present invention is to provide a soundproofing device used for a water removing device or a dust removing device, which can be easily installed and cleaned while realizing a sufficient soundproofing effect and can reduce costs.

INDUSTRIAL APPLICABILITY According to the present invention, the device can be opened and closed with respect to the transport surface of the transport means provided in the main body of the apparatus, and in a unit cover for passing the process target on the transport surface in a closed state, toward the process target. It is premised on a soundproofing device used for a water removal or dust removal device with a built-in air injection unit that injects compressed air.

On the premise of the above device, the first invention comprises a first soundproof cover installed across the transport surface on the upstream side of the unit cover in the transport direction of the object to be processed, and the object to be processed of the unit cover. It consists of a second soundproof cover that is installed across the transport surface on the downstream side in the transport direction.
Each of the first and second soundproof covers has a sound absorbing material provided on the inner wall surface, one opening on the unit cover side in a state of being installed straddling the transport surface, and one opening on the unit cover side. The shape and size of one opening of the first soundproof cover covers the periphery of the inlet opening of the object to be processed in the unit cover, while providing the other opening facing the object to be processed at a distance in the transport direction. The shape and size of one opening of the second soundproof cover covers the periphery of the outlet opening of the object to be processed in the unit cover.

In the second invention, the other opening of the first and second soundproof covers is closed with a curtain-shaped soundproof sheet that allows the object to be processed to pass through. The curtain-shaped soundproof sheet can be pushed open by the object to be processed, and closes the opening when the object to be processed does not pass through.

In the third invention, the continuous portion between the first and second soundproof covers installed across the transport surface and the unit cover is closed with a curtain-shaped soundproof sheet that enables the passage of the object to be processed. ing.
The continuous portion between the first and second soundproof covers and the unit cover is a portion where the inlet / outlet opening of the unit cover and one opening of the first and second soundproof covers are continuous. The soundproof sheet provided in the continuous portion may be provided on the unit cover side or may be provided on the opening side of the first and second soundproof covers.

In the present invention, the soundproofing device is composed of a first soundproofing cover and a second soundproofing cover, and each of the first and second soundproofing covers straddles the transport surfaces on the upstream side and the downstream side of the unit cover. It can be installed individually so as to cover the openings on the inlet side and the outlet side. Such first and second soundproof covers do not cover the entire unit cover as in the conventional soundproof box. However, since the noise generated in the unit cover is mainly transmitted to the outside from the inlet / outlet of the unit cover through which the object to be processed passes, the opening of the inlet / outlet which is the outlet of the noise does not have to cover the entire unit cover. By covering the surroundings, it was possible to efficiently reduce the noise outside the water removal or dust removal device.
Then, it was confirmed that the soundproofing device composed of the first and second soundproofing covers of the present invention can obtain the same effect as the conventional soundproofing box covering the entire unit cover.

Further, in the present invention, since it is not necessary to cover the entire unit cover, the soundproofing device can be made smaller and lighter, and the structure is simplified. Therefore, the manufacturing and installation costs of the soundproofing device can be suppressed.
Further, the first and second soundproof covers, which have been made smaller and lighter as described above, are easy to install and remove.
Furthermore, since it can be freely moved from the main body of the water removal device or the dust removal device, it can be easily cleaned, washed, dried, etc. in a place suitable for work, and the inside of the soundproof cover can be easily kept clean at all times.

According to the second invention, since the other opening of the first and second soundproof covers is closed with the soundproof sheet while allowing the object to be processed to pass through, the noise emitted from the first and second soundproof covers to the outside of the device. The noise level around the device can be further reduced.

According to the third invention, the continuous portion between the entrance / exit of the unit cover and the first and second soundproof covers can be closed with a soundproof sheet to reduce the noise transmitted from the inside of the unit cover to the first and second soundproof covers. As a result, the noise that goes out from the other opening of the first and second soundproof covers can be reduced.
Further, if a soundproof sheet is provided in the other opening of the first and second soundproof covers as well as the continuous portion with the unit cover, both the opening where noise is emitted from the unit cover and the opening of the first and second soundproof covers It is possible to prevent noise leakage and reduce the noise level outside the device.

It is a perspective view of the water removal device of embodiment of this invention. It is a perspective view of the 1st and 2nd soundproof covers of an embodiment. 2 is a perspective view of the first and second soundproof covers of the embodiment as viewed from the side opposite to FIG. It is a figure which showed the measurement position in the soundproofing effect confirmation experiment of an embodiment. It is the result of the soundproofing effect confirmation experiment of an embodiment, and is the graph which showed the measurement data on the entrance side of the processing object. It is the result of the soundproofing effect confirmation experiment of an embodiment, and is the graph which showed the measurement data on the outlet side of the processing object. It is the result of the soundproofing effect confirmation experiment of an embodiment, and is the graph which showed the measurement data on the side surface side along the transport direction of the processing object. It is a perspective view of the water removal device provided with the conventional soundproof box.

FIG. 1 is a diagram showing a state in which the first soundproof cover 9 and the second soundproof cover 10 of this embodiment are installed on the frame 1a of the device main body 1 in the water removal device. This water removal device is a device in which the soundproof box 7 is removed from the device shown in FIG. The arrow x in FIG. 1 is the transport direction of the object to be processed. That is, the first soundproof cover 9 is provided on the upstream side of the unit cover 3 in the transport direction, and the second soundproof cover 10 is provided on the downstream side of the unit cover 3.
Then, both soundproof covers 9 and 10 are brought into close contact with the wall surface on which the inlets and outlets 3a and 3b (see FIG. 8) of the unit cover 3 are formed.

Further, FIGS. 2 and 3 show the first and second soundproof covers. In this embodiment, since the first soundproof cover 9 and the second soundproof cover 10 have the same shape, the first and second soundproof covers 9 and 10 are shown at the same time in FIGS. 2 and 3, and the second soundproof cover 10 is shown. The code is shown in parentheses.
2 and 3 are perspective views in different viewing directions, FIG. 2 is a view seen from one opening 11 (12) side of the present invention, and FIG. 3 is a view seen from the other opening 13 (14) side.

As shown in FIGS. 2 and 3, the first soundproof cover 9 is composed of a pair of side surfaces 9a and 9b facing each other and a ceiling surface 9c connecting the side surfaces 9a and 9b. When installed across the transport surface 2a as shown in FIG. 1, the pair of openings 11 and 13 facing each other at intervals in the transport direction (arrow x) are provided, and the inner wall surface thereof is sponge-shaped. The sound absorbing material 15 is attached.
The opening 11 is one of the present inventions continuous with the inlet 3a of the unit cover 3 when the first soundproof cover 9 is installed on the upper frame 1a of the apparatus main body 1 on the upstream side of the unit cover 3 as shown in FIG. The opening has a size and shape that surrounds the entrance 3a of the unit cover 3.
Further, the other opening 13 facing the opening 11 is covered with a curtain-shaped soundproof sheet S1 made of, for example, silicone rubber, and the object to be treated before the water removal treatment pushes the soundproof sheet S1 open inside. I am trying to be transported.

On the other hand, the second soundproof cover 10 is configured in the same manner as the first soundproof cover 9. That is, the second soundproof cover 10 is surrounded by a pair of side surfaces 10a and 10b and a ceiling surface 10c, includes a pair of openings 12 and 14 facing each other at intervals, and a sponge-like sound absorbing material 16 is provided on the inner wall surface thereof. It is pasted.
Further, one opening 12 continuous with the outlet 3b of the unit cover 3 has a size and a shape that covers the periphery of the outlet 3b, and the other opening 14 is provided with a curtain-shaped soundproof sheet S2. The object to be treated after the water removal treatment pushes open the soundproof sheet S2 and is conveyed to the subsequent process.

The size and shape of the openings 11 and 12 of the first and second soundproof covers 9 and 10 that cover the periphery of the inlets and outlets 3a and 3b match the openings of the inlets and outlets 3a and 3b. In addition to the above, the size and shape that are larger than the matching openings and include the openings of the inlets and outlets 3a and 3b are included. However, one of the openings 11 and 12 of the first and second soundproof covers 9 and 10 that cover the periphery of the inlet / outlet 3a and 3b is larger than the outer wall surface of the unit cover 3 in which the inlet / outlet 3a and 3b are formed. There is no. This is because if the openings 11 and 12 are larger than the outer wall surface of the unit cover 3, noise leaks from the gap between the openings and the unit cover 3.

The first and second soundproof covers configured as described above are provided on the upstream and downstream sides of the unit cover 3. At this time, the pair of side surfaces 9a, 9b, 10a, and 10b of the soundproof covers 9 and 10 stand up on the frame 1a so as not to hinder the movement of the transport surface 2a.
Further, one of the openings 11 and 12 is brought into close contact with the periphery of the inlet 3a and the outlet 3b of the unit cover 3. However, in this embodiment, since the inlets and outlets 3a and 3b are covered with the soundproof sheet S, the end faces of the first and second soundproof covers are installed so as to be pressed against the soundproof sheet S. By doing so, the gap between the inlet / outlet 3a and 3b of the unit cover 3 and the continuous portion between the first and second soundproof covers 9 and 10 can be reduced, and the noise transmitted to the outside from this gap can be reduced.

Next, an experiment for confirming the soundproofing effect of the first and second soundproofing covers of this embodiment will be described.
As shown in FIG. 1, the first and second soundproof covers 9 and 10 were provided in close contact with both sides of the unit cover 3, the water removal device was operated, and the ambient noise was measured.
For comparison, measurements were also made when the conventional soundproof box 7 was used and when none of the soundproof devices was used. However, even when the soundproofing device is not used, the soundproofing sheet S is attached to the inlets and outlets 3a and 3b of the unit cover 3.

In this confirmation experiment, the measurement positions of the volume are the measurement points A, B, and C with reference to the outer wall surface of the apparatus main body 1, as shown in FIG. Specifically, the measurement point A about 1 [m] from the outer wall on the inlet 3a side of the unit cover 3, the measurement point B about 1 [m] from the outer wall on the outlet 3b side, along the transport direction of the object to be processed. It is a wall surface on the front side of the device main body 1 and is a measurement point C about 1 [m] from the center in the longitudinal direction of the device main body 1. The heights of all the measurement points A, B, and C are the same as the upper surface position of the frame 1a of the apparatus main body 1.

The above measurement results are as shown in the graphs of FIGS. 5 to 7.
FIG. 5 is a graph showing each measured value at measurement point A, FIG. 6 is a graph showing measured values at measurement point B, and FIG. 7 is a graph showing measured values at measurement point C, with the horizontal axis representing sound. The frequency is [Hz] and the vertical axis is the noise level [dB].
In each graph, the alternate long and short dash line 1 is the measured value when the soundproofing device according to the embodiment of the present invention is used, the solid line 2 is when the conventional soundproofing box 7 is used, and the broken line 3 is when the soundproofing device is not used. It is a measurement result of.

As shown in FIG. 5, the noise level at the measurement point A is almost the same between the one-dot chain line 1 of the soundproofing device of this embodiment and the solid line 2 of the conventional soundproofing box, and the noise level is the broken line 3 which does not use the soundproofing device. It was found that the noise was reduced in comparison.
Further, neither the measured value at the measurement point B shown in FIG. 6 nor the measured value at the measurement point C in FIG. 7 is significantly different between the alternate long and short dash line 1 and the solid line 2, and both have a noise level as compared with the broken line 3 without the soundproofing device. Can be seen to be low.

From these results, it was found that the soundproofing effect of the soundproofing device composed of the first and second soundproofing covers of this embodiment is not inferior to that of the conventional soundproofing box.
As described above, the reason why the first and second soundproof covers 9 and 10 of this embodiment can exhibit the same soundproofing effect as the soundproofing box 7 that covers the entire unit cover 3 that is a noise source is considered as follows.

It is considered that the noise generated in the unit cover 3 is mainly transmitted to the outside from the inlets / outlets 3a and 3b of the object to be processed. This can be seen from the fact that among the noise levels of the broken line 3 without the soundproofing device, the value at the measurement point C shown in FIG. 7 is smaller than the value at the measurement points A and B in FIGS. 5 and 6. The measurement points A and B are positions facing the inlet / outlet 3a and 3b of the unit cover 3, and the measurement points C are positions not facing the inlet / outlet 3a and 3b. Since the noise levels on the inlet / outlet 3a and 3b sides are high in this way, it can be inferred that these inlets / outlets 3a and 3b are noise outlets.

Therefore, in this embodiment, the external noise level can be efficiently reduced by covering the periphery of the inlet / outlet 3a and 3b of the unit cover 3, which is the outlet of the noise generated in the unit cover 3. Conceivable.
In the above embodiment, the soundproof sheets S are provided at the inlets and outlets 3a and 3b of the unit cover 3 to block the continuous portions with the first and second soundproof covers, and the other of the first and second soundproof covers 9 and 10. Since the openings 13 and 14 are also closed with the soundproof sheets S1 and S2, the soundproofing effect can be further enhanced.
Although the soundproof sheets S, S1 and S2 are not essential components, the soundproofing effect can be surely improved by providing them.

Further, the soundproof sheets S and S provided at the inlets and outlets 3a and 3b of the unit cover 3 cover the first and second soundproof covers 9 so as to close one of the openings 11 and 12 of the first and second soundproof covers 9 and 10. , The same effect can be obtained by providing it on the 10 side.
The materials of the soundproof sheets S, S1 and S2 are not limited as long as they can close the opening while allowing the object to be processed to pass through, but if they are made of a material having a sound absorbing effect, the soundproofing effect is further improved. Can be expected.
Further, a vibration damping plate may be provided on the inner wall of the first and second soundproof covers together with the sound absorbing material to further improve the soundproofing effect.

Further, if the shapes of the first and second soundproof covers do not hinder the movement of the object to be processed across the transport surface and can cover the periphery of the inlets and outlets 3a and 3b of the unit cover 3, as shown in FIGS. Not limited to U-shape. For example, the ceiling surface may be an inclined surface or a curved surface, or may have a cross-sectional shape such as a kamaboko, in which the side surface and the ceiling surface are indistinguishable.

As described above, in the soundproofing device of this embodiment, which can obtain the same soundproofing effect as the conventional soundproofing box 7, the first and second soundproofing covers 9 and 10 can be individually installed on the device main body 1. Since it can be installed and removed, it is easy to install and remove.
Further, the first and second soundproof covers 9 and 10 have a simple structure and the manufacturing cost can be suppressed.
Further, the first and second soundproof covers 9 and 10 removed from the device main body 1 can be moved to a place where work can be easily performed, and the inside can be cleaned, washed, and dried, so that the inside can be cleaned. Easy to keep.

Although the soundproofing device attached to the water removing device has been described in the above embodiment, the first and second soundproofing covers can be used as a soundproofing device for the dust removing device, and the same effect as described above can be obtained in that case as well. ..

It is most suitable for water removal or dust removal equipment used in processes with strict hygiene control such as food processes.

1 Equipment body 2 (Transport means) Net conveyor 2a Conveyance surface 3 Unit cover 3a (Unit cover) inlet 3b (Unit cover) outlet 4 Air injection unit 9 1st soundproof cover 10 2nd soundproof cover 11, 12 One opening 13, 14 Other openings 15, 16 Sound absorbing materials S, S1, S2 Soundproof sheet

Claims (3)

It can be opened and closed with respect to the transport surface of the transport means provided in the main body of the device.
A soundproofing device used for a water removal or dust removal device that has an air injection unit that injects compressed air toward the processing object in a unit cover that allows the processing object to pass through on the transport surface in the closed state. ,
A first soundproof cover installed across the transport surface on the upstream side of the unit cover in the transport direction of the object to be processed, and
It is composed of a second soundproof cover that is installed across the transport surface on the downstream side of the unit cover in the transport direction of the object to be processed.
Each of the above 1st and 2nd soundproof covers
The sound absorbing material provided on the inner wall surface and
In the state where it is installed across the transport surface, one opening on the unit cover side and
It is provided with the other opening facing the one opening at a distance in the transport direction of the object to be processed.
One opening of the first soundproof cover has a shape and size that covers the periphery of the entrance opening of the object to be processed in the unit cover, and one opening of the second soundproof cover is the outlet of the object to be processed in the unit cover. A soundproofing device with a shape and size that covers the perimeter of the opening. The soundproofing device according to claim 1, wherein the other opening of the first and second soundproofing covers is closed with a curtain-shaped soundproofing sheet that allows the object to be processed to pass through. Claim 1 or 2 in which the continuous portion between the first and second soundproof covers installed across the transport surface and the unit cover is closed with a curtain-shaped soundproof sheet that allows the passage of the object to be processed. The soundproofing device described in.

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