JP2010270759A - Silencing method in spraying machine and silencer for spraying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencing method in a spraying machine and a silencer for the spraying machine, for maintaining the silencing effect over a long period, by surely filtering a spraying material mixedly existing in exhausted pressurized air. <P>SOLUTION: Before attenuating a discharge sound of the pressurized air by a silencing means, for preventing the deterioration in the sound reducing effect by clogging in the silencing means of a spraying material mixedly existing in the pressurized air, the spraying material mixedly existing in the pressurized air is separately cleaned, and afterwards, the discharge sound of this cleaned pressurized air is attenuated by the silencing means, and is discharged in the atmosphere. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a silencer method for a sprayer and a silencer for a sprayer.

  In recent years, blasting materials such as mortar, concrete and greening base materials are transported and sprayed by pressurized air, and the impact sound when discharging pressurized air, etc. in a spraying machine is a problem of hearing loss for workers, passers-by and neighbors Was causing noise.

  This type of sprayer 50 is configured as shown in FIG. 10, and is connected to a pressurized air supply pipe 52 connected to a compressor 51. The sprayer 50 includes an upper pressurization tank 53 to which spray material is supplied from a hopper 55 via an upper slide valve 56, and a lower pressurization connected to the upper pressurization tank 53 via a lower slide valve 57. A spraying material that has been kneaded and kneaded is discharged from a discharge port 59 provided in the lower portion of the lower pressurization tank 54.

  The specific operation is as follows. First, the spray material is introduced into the upper pressurized tank 53 from the hopper 55, and the spray material is stirred and kneaded in the upper pressurized tank 53. Next, after the inside of the upper pressurized tank 53 is pressurized to the same extent as in the lower pressurized tank 54, the closed state by the lower slide valve 57 between the upper pressurized tank 53 and the lower pressurized tank 54 is released, The agitated and kneaded spray material is fed into the lower pressure tank 54. Next, the spray material is agitated and kneaded in the lower pressurization tank 54, and the spray material is pumped toward the work object by the pressurized air supplied from the compressor 51 from the lower pressurization tank 54.

  In such a sprayer 50, when the spray material is put into the upper pressurized tank 53, it is necessary to open the upper slide valve 56. Prior to this, the exhaust valve 58 is opened to open the upper pressurized tank. The pressurized air in 53 needs to be discharged. Since this pressurized air must be discharged at once, a considerable impact sound is generated, and thus the above-described problem has occurred.

  Therefore, various silencers have been developed so far to reduce the discharged sound. For example, Patent Document 1 discloses a base cylinder body having a plurality of exhaust small holes, a lid body that can be applied to the opening of the base cylinder body, a plurality of exhaust small holes, and an interior in the base cylinder body. A silencing device comprising a plurality of storage cylinders has been proposed, and this silencer has a plurality of storage cylinders in which pressurized air in the upper pressurized tank is introduced from the pipe connection portion of the lid body. Are exhausted to the outside through the exhaust small holes and the exhaust small holes of the base cylinder.

Japanese Examined Patent Publication No. 7-42849

However, since the pressurized air that is discharged is mixed with spray materials such as mortar, concrete, and greening base material, the exhaust small holes of the storage cylinder and the exhaust small holes of the base cylinder in the above invention are sprayed. There was a problem that the material was clogged immediately and the sound reduction effect of the silencer was remarkably inferior.
Therefore, a main problem of the present invention is to provide a silencer method and a silencer for a sprayer that reliably filters the sprayed material mixed in the discharged compressed air and maintains the silencing effect over a long period of time. .

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A muffler method for attenuating the discharge sound of pressurized air generated from a spraying machine that transports spraying material,
Prior to attenuating the exhausted sound of the pressurized air by the silencer, the compressed air is used to prevent deterioration of the sound reduction effect due to clogging of the spray material mixed in the pressurized air at the silencer. The spray material mixed in is separated and cleaned, and then the exhausted sound of the cleaned pressurized air is attenuated by the muffling means and released into the atmosphere.
A silencing method in a spray machine, characterized in that.

(Function and effect)
By separating and cleaning the sprayed material mixed in the pressurized air, the silencer is prevented from being clogged by the sprayed material, and then the cleaned pressurized air is attenuated by the silencer and put into the atmosphere. By discharging, it is possible to reliably filter the spray material mixed in the discharged pressurized air and to maintain the silencing effect over a long period of time.

<Invention of Claim 2>
A silencer for a sprayer that attenuates the discharge sound of pressurized air generated from a sprayer that transports the spray material,
This silencer for a sprayer prevents deterioration of the sound reduction effect due to clogging of the blowing material mixed in the pressurized air before the sound of the compressed air is attenuated by the silencer. In order to do so, it has a filtration part that separates the spray material mixed in the pressurized air, and the muffler part that attenuates the discharge sound of the pressurized air from the filtration part and emits it into the atmosphere.
A silencer for a sprayer characterized by that.

<Invention of Claim 3>
The filtration unit is provided with a container body that is supplied with the pressurized air, separates the sprayed material mixed in the pressurized air, and discharges the pressurized air after the sprayed material is separated. The side is removable.
The silencer for a sprayer according to claim 2.

(Function and effect)
By separating and cleaning the sprayed material mixed in the pressurized air in the filtration unit, the silencer is prevented from being clogged by the sprayed material, and then this cleaned pressurized air is attenuated by the silencer. By discharging into the atmosphere, it is possible to reliably filter the sprayed material mixed in the discharged pressurized air. Moreover, since there is no possibility of clogging at the silencer, the silencer effect can be maintained for a long time.

  According to the present invention, there is an advantage that the spray material mixed in the discharged pressurized air can be reliably filtered and the silencing effect can be maintained over a long period of time.

It is explanatory drawing which shows the state which attached the silencer for sprayers which concerns on this invention to the sprayer. It is a transverse cross section (II-II sectional view) of a filtration part. It is the longitudinal cross-sectional view (II sectional drawing). It is a transverse cross section (IV-IV sectional view) of other embodiments of a filtration part. It is the longitudinal cross-sectional view (III-III sectional drawing). It is explanatory drawing which shows the state which attaches a filter member in piles. It is a longitudinal cross-sectional view of the silencer side surface. It is a longitudinal cross-sectional view of the silencer front. It is explanatory drawing which showed the positional relationship in the case of noise measurement. It is explanatory drawing of a spraying machine.

Embodiments of the present invention will be described below.
<Mute method in spray machine>
The silencing method in the spraying machine according to the present invention is a connecting pipe (exhaust pipe) from the exhaust valve of the spraying machine that transports the spraying material such as mortar, concrete, greening base material and bentonite and sprays onto the construction object as described above. It is the method performed with respect to the pressurized air supplied through this.

  That is, it is a silencing method for attenuating the discharge sound of pressurized air generated from a spraying machine that conveys the spraying material, separating and purifying the spraying material mixed in the pressurized air, and cleaning the compressed air It is attenuated by the silencer and released into the atmosphere. A known silencer can be used as the silencer. Although not shown in the figure, for example, the sound is attenuated by passing compressed air through a gap between the sound-absorbing material filled with a high density and covered with a perforated plate. Alternatively, a silencer such as one that attenuates noise over a wide frequency range by passing through a plurality of chambers provided with perforated tubes can be used.

  Thus, by separating and cleaning the spray material mixed in the pressurized air, the silencer is prevented from being clogged by the spray material, and then the cleaned pressurized air is attenuated by the silencer. By discharging into the atmosphere, it is possible to avoid deterioration of the sound reduction effect due to clogging with the silencer like the conventional method over a long period of time, and reliably filter the spray material mixed in the discharged pressurized air In addition, the silencing effect can be maintained over a long period of time.

  In addition, it is preferable to perform the separation of the spray material by, for example, arranging a baffle plate or the like so as to block the straight advance of the pressurized air, and causing the pressurized air to meander. As a result, the flow rate of the pressurized air is greatly reduced, and the exhaust sound is also significantly reduced.

Below, the silencer for sprayers using the silencing method in the sprayer which concerns on this invention is demonstrated.
<Muffler for spray machine>
As shown in FIG. 1, the silencer 1 for a sprayer according to the present invention is supplied with pressurized air from the exhaust valve 58 of the sprayer 50 as described above via a connection pipe (exhaust pipe) 60. It is configured. In addition, this silencer 1 for sprayers can be connected to a well-known sprayer.

  As shown in FIGS. 1 to 8, the silencer 1 for a sprayer according to the present invention includes a filtering unit 2 and a silencing unit 3. The filtration part 2 is a part which removes spraying materials, such as mortar, concrete, a greening base material, and bentonite, which are mixed in the discharged pressurized air, separately from the pressurized air. The silencer 3 attenuates (reduces) the pressurized air cleaned by the filter and discharges it into the atmosphere.

  In the silencer 1 for a sprayer, the filter unit 2 separates and cleans the spray material mixed in the pressurized air, thereby preventing the silencer unit 3 from being clogged by the spray material, and then cleaning the spray material. The compressed air mixed in the discharged pressurized air can be reliably filtered by attenuating the compressed air by the silencer 3 and releasing it into the atmosphere. Moreover, since there is no possibility of clogging in the silencer 3, the silencing effect can be maintained over a long period of time. Below, the structure of the filtration part 2 and the muffling part 3 is explained in full detail.

(Filtration part)
As shown in FIGS. 2 and 3, the filtration unit 2 includes a container body 20 having a supply port 20A to which pressurized air is supplied and a discharge port 20B to be discharged, and a container body 20 so as to meander the pressurized air. , And filter members 23, 23,... Attached to the inside of the container of the discharge port 20B.

  In the present embodiment, the container body 20 has a rectangular parallelepiped shape, but is not limited thereto, and may be a cylindrical shape or a polygonal body. Since the side surface of the container body 20 can be removed, the separated spray material can be easily cleaned, and the maintainability is excellent.

  The supply port 20A in the filtration part 2 is formed in the lower part of the side surface of the container body 20, and the connection pipe 60 is connected to the supply port 20A. A first baffle plate 21 is attached above the position of the supply port 20 </ b> A, and a second baffle plate 22 is attached above the first baffle plate 21. The baffle plates 21 and 22 are constituted by a plate in which a plurality of holes 21A and 22A that are drilled are unevenly distributed on one side, and pressurized air can pass through these holes 21A and 22A. Instead of the baffle plates 21 and 22 as shown in FIG. 2 and FIG. 3, flat baffle plates (not shown) in which the perforated portions of the baffle plates 21 and 22 are cut out are alternately flowed up and down. You may arrange | position so that.

  A first filtration space 25 is formed by a space surrounded by the bottom and side walls of the container body 20 and the first baffle plate 21, and a supply port 20 </ b> A is formed in the first filtration space 25. Pressurized air is supplied through the port 20A. A second filtration space 26 is formed by a space surrounded by the side wall of the container body 20, the first baffle plate 21, and the second baffle plate 22, and the upper surface, the side wall, and the second baffle of the container body 20 are formed. A third filtration space 27 is formed by the space surrounded by the plate 22. The first baffle plate 21 and the second baffle plate 22 are alternately arranged so that the holes 21A and 22A do not overlap each other. The compressed air moves upward from the first filtration space 25 to the second filtration space 26 and the third filtration space 27. On the other hand, the mixed spray material is mixed with the side wall or the obstacle of the container body 20. It is blocked by the plates 21 and 22 and gradually separated from the compressed air.

  In addition, the flow rate of the compressed air is greatly reduced by passing through a plurality of rooms of the first filtration space 25, the second filtration space 26, and the third filtration space 27, and the discharge sound is also significantly attenuated.

  A discharge port 20B is formed in the third filtration space 27, and a plurality of filter members 23, 23,... Are attached to the inside of the container of the discharge port 20B. These filter members 23, 23,... Can be selected from perforated plates such as punching metal, nets, and the like. A plurality of presser members 24, 24,... Such as presser blocks for attaching the filter member are arranged at a predetermined interval on the container inner side of the discharge port 20B, and between the presser members 24, 24 adjacent to each other. The filter member 23 can be attached by being sandwiched between the two. In the present embodiment, the filter member 23 can be attached to five locations. However, the present invention is not limited to this, and at least one location may be attached.

  In order to remove the spray material effectively with this filter member 23, it is sufficient to attach a small hole diameter or fine one as much as possible even with a single filter member 23. It takes time to remove the spray material adhering to the holes, and the cleaning work efficiency of the filter member 23 is deteriorated. Therefore, as shown in FIG. 6, it is preferable that the two filter members 23 are attached in a stacked manner. Specifically, the holes of the first perforated plate 23A and the holes of the second perforated plate 23B are formed so as to form a single hole so that the mutual holes are shifted and overlapped to have a desired size. It may be adjusted while shifting so that the diameter becomes. With this configuration, the size of the hole through which the pressurized air passes can be arbitrarily adjusted, and it becomes easy to remove the spray material adhering to the hole, and the cleaning work efficiency of the filter member 23 is improved. Is. In the embodiment, the two porous plates 23A and 23B are used. However, the present invention is not limited to this, and three or more plates can be stacked.

  In addition, the form shown in FIG.4 and FIG.5 can also be considered as other embodiment of a filtration part. 2 and FIG. 3 is different from the embodiment shown in FIG. 2 in that the flow paths are formed in the horizontally long container body 200 in such a manner that flat baffle plates 201, 201,. It is to arrange. Thereby, pressurized air is made to meander up and down, and isolation | separation with a spraying material is achieved. Other configurations are the same as those shown in FIG. 2 and FIG.

  As described above, the filtration unit is configured so that the pressurized air passes through the space (filtration space) formed by the face material including the baffle plate and is filtered by the filter member so that the sprayed material is separated. Thus, the spray material can be more effectively separated.

(Silent part)
As shown in FIGS. 7 and 8, the silencer 3 includes a container body 30 having a supply port 30A to which pressurized air is supplied and a discharge port 30B to be discharged, and a sound absorbing material laid in the container body 30. 31, the sound absorbing material 31 is prevented from being deformed and a hollow body 32 having a plurality of holes for introducing pressurized air therein, and the container body 30 and the hollow body 32 are formed. Partition plates 33, 33,... That partition the space. Note that a hood is attached to the discharge port 30B so that rainwater or the like can be prevented from entering.

  In the present embodiment, the container body 30 has a rectangular parallelepiped shape, but is not limited thereto, and may be a cylindrical shape or a polygonal body. The plate thickness of the container body 30 is preferably about 2.3 mm in consideration of transmitted sound and ease of handling. Since the side surface of the container 30 can be removed, the separated spraying material can be easily cleaned, and the maintainability is excellent.

  The supply port 30A in the muffling unit 3 is connected to the discharge port 20B of the filtration unit 2 through both flange portions, and the pressurized air from which the spray material has been removed and cleaned is supplied. ing.

  The hollow body 32 is configured by box-shaped boxes 32A and 32B connected to the supply port 30A and the discharge port 30B, and a cylindrical body 32C connected to the boxes 32A and 32B. In addition, as a shape, it is not restricted to these, You may form in arbitrary shapes. The material of the hollow body 32 can be selected from a perforated plate such as punching metal or a net.

  The partition plates 33, 33,... Partition the space formed by the inside of the container main body 30 and the hollow body 32 into a plurality of spaces. It constitutes a structure to increase sound reduction.

  The sound absorbing material 31 is spread in a space surrounded by the inside of the container main body 30, the hollow body 32, and the partition plates 33, 33,..., And the impact sound is attenuated by passing through the gap between the filled sound absorbing material 31. Is.

  Glass wool, rock wool, or the like can be used as the material of the sound absorbing material 31. However, if a “perfect barrier” manufactured by Endeavor House Co., Ltd./Kanebo Gosei Co., Ltd. is used, the spray material enters the sound deadening portion 3. Is also preferable because it can be washed.

  In addition, as shown in FIG. 8, by attaching the splitter 34 in the cylindrical body 32C of the hollow body 32, the volume reduction in the middle / high frequency range can be increased.

With the arrangement shown in FIG. 9, the air pressure of the compressor used was set to 7 kg / cm ² , and an experiment for confirming the silencing effect was performed using the silencer for a sprayer according to the present invention. As a result of measuring the noise level, the results shown in Table 1 were obtained. When the silencer was not attached, the measured value of noise at a point 5 m away was 127 dB. The length of the connection pipe (exhaust pipe) was 5 m.
From this result, it was found that 85 dB or less of the standard in the noise regulation method can be cleared at a position of 5 m from the discharge port.

  INDUSTRIAL APPLICABILITY The present invention can be applied as a silencing method in a spraying machine and a silencer for a spraying machine in which spraying materials such as mortar, concrete, and greening base material are conveyed and sprayed with pressurized air.

  DESCRIPTION OF SYMBOLS 1 ... Silencer for spray machines, 2 ... Filtration part, 3 ... Silencer part, 20 ... Container main body, 20A ... Supply port, 20B ... Discharge port, 21 ... 1st baffle plate, 21A ... Hole (hole part), 22 2nd baffle plate, 22A ... hole (hole), 23 ... filter member, 24 ... pressing member, 25 ... first filtration space, 26 ... second filtration space, 27 ... third filtration space, 30 ... Container body, 30A ... Supply port, 30B ... Discharge port, 31 ... Sound absorbing material, 32 ... Hollow body, 33 ... Partition plate, 32A, 32B ... Box body, 32C ... Cylindrical body, 34 ... Splitter, 50 ... Spraying machine, DESCRIPTION OF SYMBOLS 51 ... Compressor, 52 ... Pressurized air supply pipe, 53 ... Upper pressurization tank, 54 ... Lower pressurization tank, 55 ... Hopper, 56 ... Upper slide valve, 57 ... Lower slide valve, 58 ... Exhaust valve, 59 ... Exhaust valve Outlet, 60 ... connecting pipe (exhaust pipe).

Claims (3)

A muffler method for attenuating the discharge sound of pressurized air generated from a spraying machine that transports spraying material,
Prior to attenuating the exhausted sound of the pressurized air by the silencer, the compressed air is used to prevent deterioration of the sound reduction effect due to clogging of the spray material mixed in the pressurized air at the silencer. The spray material mixed in is separated and cleaned, and then the exhausted sound of the cleaned pressurized air is attenuated by the muffling means and released into the atmosphere.
A silencing method in a spray machine, characterized in that. A silencer for a sprayer that attenuates the discharge sound of pressurized air generated from a sprayer that transports the spray material,
This silencer for a sprayer prevents deterioration of the sound reduction effect due to clogging of the blowing material mixed in the pressurized air before the sound of the compressed air is attenuated by the silencer. In order to do so, it has a filtration part that separates the spray material mixed in the pressurized air, and the muffler part that attenuates the discharge sound of the pressurized air from the filtration part and emits it into the atmosphere.
A silencer for a sprayer characterized by that. The filtration unit is provided with a container body that is supplied with the pressurized air, separates the sprayed material mixed in the pressurized air, and discharges the pressurized air after the sprayed material is separated. The side is removable.
The silencer for a sprayer according to claim 2.

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