JP5401206B2 - Blast room - Google Patents

Description

  The present invention relates to a blasting chamber or a blasting working chamber, and more specifically, when performing blasting on a relatively large workpiece, a worker or a plurality of workers enter the workpiece together with the workpiece. In a blasting work chamber in which a working space of a size that can be obtained is formed, not only blasting but also blasting can be performed in a common space for the work after blasting. Related to the room.

  The blasting in the present invention includes various types in which the abrasive is sprayed or projected in a dry manner (hereinafter also referred to as “injection”), and the abrasive is used together with a compressed gas such as compressed air. Injecting the projection material by centrifugal force, and injecting the projection material by striking with a rotating impeller or the like.

  In addition to abrasive grains for polishing or cutting, other abrasives, so-called abrasive balls such as steel balls, glass, plastic, ceramic beads, etc. that are injected for the purpose of applying residual stress to the workpiece. "Shot" and other powders or grains such as seed husk or flour sprayed for various purposes are widely included.

  Abrasive material is injected to collide with the workpiece, and the workpiece is cut or cleaned, or a shot such as a steel ball is applied to the workpiece to apply residual stress to the workpiece. Blasting is used in various fields.

  In such a blasting process, the work environment is contaminated by the scattering of dust that consists of the sprayed abrasive or the crushed powder generated when the abrasive collides with the work, and the work's cutting powder. Since it is necessary to recover the material in order to reuse it, it is common to form a working chamber isolated from other spaces and perform work in this working space.

  Also, during painting, the surroundings are contaminated by scattering of paint particles sprayed by the spray or volatilization of the solvent contained in the paint. On the contrary, foreign matter such as dust enters the work space from the surroundings. In order to prevent this, since the quality of the coating is greatly reduced if it adheres to the coating film, a working chamber isolated from other spaces is formed, and the painting process is performed in this working space.

  In addition, when the blasting process described above is performed as a pre-painting process, an apparatus configuration has been proposed so that the painting process can be performed following the blasting process. As an example, a high-pressure gas container such as an LP gas container (gas cylinder) is proposed. The blasting booth for painting and the booth for painting are provided to enable painting after rust removal after re-inspection. There has also been proposed an apparatus configured to perform blasting when passing through and then transport to a painting booth to perform painting (see Patent Document 1).

JP-A-8-28793

  If the workpiece to be processed is relatively small like an LP gas cylinder and has the same shape and the same processing contents as in the above-mentioned Patent Document 1, a booth for blasting is used. It is also relatively easy to provide a painting booth and a separate booth, and transfer the workpiece to a different booth for each process.

  However, for example, when the shape is large and a small quantity product is used as the workpiece, the material or shape of the workpiece to be processed and the content of the processing are often different each time. In many cases, an operator or the like manually performs processing for each work without being familiar with the processing by the uniform flow work.

  Therefore, when working on such workpieces, a large work room with a relatively large work space in which workers can enter and work together with the work is required. If a separate work room and a paint work room are to be provided separately, it will be necessary to secure a large installation space or prepare equipment necessary for each treatment, which will require a large initial investment. Is a blast processing company equipped with facilities or equipment that can handle blasting of large workpieces, and painting is performed by a painter equipped with facilities or equipment that can handle painting of large workpieces. is the current situation.

  However, when work is divided between different processors for each process, it is necessary to transport and transport the work for each work process, resulting in time loss or cost burden. To do.

  In addition, if it takes a long time to transport or transport from blasting to painting, the surface of the workpiece may be rusted. Also, when transporting or transporting, workers or transport equipment may come into contact with the workpiece. In some cases, dirt such as oil or fat may adhere to the workpiece surface. If such rust occurs or dirt is attached, an operation for removing the rust or dirt is required before painting.

  In view of the above, when blasting a large workpiece as a pretreatment for painting, the workpiece is blasted and then painted directly in the blasted work chamber without moving or unloading the workpiece. It would be advantageous if

  However, because there is abrasive material used during blasting or dust generated during blasting in the work chamber where blasting has been performed, if the workpiece is directly coated in this work chamber, the abrasive material Alternatively, dust may adhere to the coating as a foreign substance. Such adhesion of the foreign substance significantly reduces the quality of the coating, and in some cases, the coating itself needs to be redone.

  In addition, when recovering and reusing the abrasive sprayed in the working chamber, if the paint is mixed in the abrasive, the abrasive may be colored or the abrasive particles may adhere to each other due to the paint. In some cases, once used abrasives are collected and cannot be reused.

  In both cases of blasting and painting, dust or mist-like paint particles are scattered and contaminated in the work chamber, so it is necessary to ventilate the work chamber and keep it clean. In the work room where both blasting and painting work are performed, it is necessary to remove the dust or paint particles that are the cause of contamination before exhausting such contaminated air out of the work room. Common.

  However, contamination in the work space during blasting is caused by dust composed of crushed abrasive or workpiece cutting powder, and contamination in the work space during painting is caused by spraying. This is caused by fine particles of sprayed mist-like paint, and the cause of contamination is different in this way. Therefore, an appropriate ventilation method and trapping of the cause of contamination are required during blasting and painting, respectively. The collection method is different.

  In view of the above, blasting and painting are not performed in a common working chamber, and a working chamber configured to perform both blasting and painting has not been proposed.

  Therefore, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and can be performed before and after blasting and painting in a common work chamber, and each process of blasting and painting. Providing a blasting chamber that can be ventilated by an appropriate ventilation method and an appropriate collection method of the causative agent for each contamination, and therefore can be painted in the same space following blasting. With the goal.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This symbol is intended to clarify the correspondence between the description of the claims and the description of the mode for carrying out the invention. Needless to say, it is used for the interpretation of the technical scope of the claims of the present invention. It is not used restrictively.

In order to achieve the above object, the blast chamber 1 of the present invention includes a box-shaped main body 10 surrounded by side walls 11 to 14, a top plate 15 and a floor plate 16,
A dust collector unit 20 that is activated during blasting operation and sucks dust floating in the main body 10 together with air in the main body 10, and collects dust in the air and exhausts clean air;
Paint that is activated during the painting process and sucks the paint particles floating in the main body 10 together with the air in the main body 10 and collects the paint particles in the air to exhaust clean air from which the paint particles are removed. A ventilation unit 30 is provided,
The side wall 11 of any one of the main bodies 10 is provided with an entrance / exit 11a for carrying in / out the workpiece W and entering / leaving the worker M, and an opening / closing body 11b such as a door or a shutter for opening / closing the entrance / exit 11a. Projecting from the top plate 15 toward the floor plate 16 in the main body 10 near the other side wall 12 opposite to the one side wall 11, and a lower end 25 a is arranged at a predetermined high position with respect to the floor plate 16. A partition wall 25 is provided, and a space in the main body 10 is partitioned by the partition wall 25, thereby forming a work space 10 a between the one side wall 11 and the partition wall 20, and the partition wall 20 and the other side wall 12. A ventilation duct 10b having a lower end communicating with the work space 10a is formed at an interval between
A number of intake holes 17 for introducing outside air into the work space 10a are formed in the top plate 15 above the work space 10a.
The dust collector unit 20 and the paint ventilation unit 30 communicate with the ventilation duct 10b, respectively, and the suction air speed of the dust collector unit is set so that the wind speed in the ventilation duct 10b is equal to or lower than the floating speed of the abrasive used. (Claim 1).

In the blast chamber 1 having the above-described configuration, either the dust collector unit 20 or the paint ventilation unit 30 (in the embodiment, the dust collector unit 20) is provided in a projecting manner in the main body 10 to form the partition wall 25, and A suction port (in the embodiment, a suction port 22 of the dust collector unit 20) of the dust collector unit 20 or the paint ventilation unit 30 constituting the partition wall 25 is formed on the surface of the partition wall 25 facing the other side wall 12. ,
The other side wall 12 may be formed with an opening 12a that allows the other of the dust collector unit 20 or the paint ventilation unit 30 (the paint ventilation unit 30 in the embodiment) to communicate with the ventilation duct 10b (Claim 2).

  In the above configuration, first opening / closing means (a lid plate for opening / closing the opening 12a in the embodiment) 12b for opening / closing the opening 12a can be provided (Claim 3).

  The ventilation air volume per minute by the dust collector unit 20 is preferably 1.5 times or more the volume in the main body 10 (Claim 4).

  Furthermore, it is preferable that the paint ventilation unit 30 includes a baffle plate 32a as the paint particle collecting means 32 (Claim 5).

  Further, the air flow velocity in the work space 10a generated by the ventilation by the paint ventilation unit 30 is configured to be 0.4 m / s or more (Claim 6).

  Furthermore, it is preferable that the ventilation air volume by the paint ventilation unit 30 is 2 to 7 times the ventilation air volume by the dust collector unit 20 (Claim 7).

Note that an abrasive recovery duct 41 that opens at one end toward the work space 10a at the lower end position of one of the side walls of the main body 10 (the other side wall 12 in the embodiment), and the other end of the abrasive recovery duct 41. A polishing material recovery unit 40 is provided which includes a cyclone 42 communicating with the inlet 42a and an exhaust duct 43 having one end communicating with the exhaust port 42b of the cyclone 42 and the other end communicating with the ventilation duct 10b. ,
Second opening / closing means 44 for communicating or blocking between the exhaust duct 43 and the suction port 22 of the dust collector unit 20;
A third opening / closing means 45 for opening and closing the flow path in the ventilation duct 10b can be provided below the communication position of the dust collector unit 20 and the paint ventilation unit 30 (Claim 8).

  In this case, a flexible abrasive recovery hose 47 may be provided so as to be connectable to the opening of the abrasive recovery duct 41 (Claim 9).

Further, an opening plate 61 such as grating is laid on the floor plate 16 in the work space 10a at a predetermined interval to form an abrasive recovery space 62 between the floor plate 16 and the opening plate 61. , The abrasive recovery duct 41 ′ opening toward the recovery space 62 is communicated with the introduction port of the cyclone 42 ′, and the exhaust duct 43 ′ communicated with the exhaust port of the cyclone 42 ′ is provided with the exhaust fan 51. An abrasive recovery unit 40 'is formed in communication with the dust collector 50, and
A closing means 63 for closing the opening of the opening plate 61 may be provided during the painting process (claim 10).

  With the above-described configuration of the present invention, the blast chamber of the present invention closes the inlet / outlet port 11a and operates the dust collector unit 20 during blasting, and opens the inlet / outlet port 11a and operates the painting ventilation unit 30 during painting. Thus, during the blasting process, the dust collector unit 20 can collect the ventilation and dust corresponding to the contamination state in the work chamber 1 during the blasting process. Ventilation corresponding to the contamination state of the time and the collection of paint particles could be performed, and the common work chamber 1 could be suitably used for both blasting and painting.

  In addition, due to the configuration of the work chamber 1 described above, outside air is introduced into the work chamber 1 through the air inlet 17 formed in the top plate 15 of the main body 10 during the blast work performed with the entrance / exit 11a closed. Since the suction in the work space 10a is performed through the ventilation duct 10b communicating with the work space 10a at a relatively low position between the lower end 25a of the partition wall 25 and the floor board 16, the work chamber 1 is an example. As shown in FIG. 1, there is a downward air flow acting to push down the abrasives injected in the work space 10 a or grinding dust generated by blasting, crushed powder of abrasives and the like to the floor plate 16 side. As a result, the contamination due to the floating of the abrasive or the dust can be eliminated at an early stage, and the abrasive or the dust is difficult to adhere to the top plate 15 or the side walls 11 to 14. Abrasive or dust adhering to the position, it could also prevent the harmful effects such as adhering to the coating film to fall upon the subsequent painting.

  Further, by setting the suction wind speed of the dust collector unit 20 so that the wind speed in the ventilation duct 10b is lower than the floating speed of the abrasive, the abrasive is prevented from being sucked into the dust collector unit 20 during ventilation by the dust collector unit 20. It was possible to collect and reuse the abrasive material separately.

  In addition, an entrance / exit 11a provided in one side wall 11 and an opening / closing body 11b such as an open / close door for opening / closing the entrance / exit 11a are provided, and another side wall facing the one side wall 11 provided with the entrance / exit 11a. Since the ventilation by the painting ventilation unit 30 is performed through the ventilation duct 10b formed on the 12 side, the painting ventilation unit 30 performs the ventilation with the entrance / exit 11a opened, and when painting, FIG. As shown, by generating an air flow flowing from the left side to the right side in the drawing in the work space 10a, the paint particles can be moved in the work space 10a for a relatively long distance, during which the paint particles are dried. This makes it easier to collect the paint particles in the paint ventilation unit 30.

  In addition, by ventilating with the entrance / exit 11a opened, a large amount of air was introduced into the work space 10a, and the work space 10a could be made a clean and sanitary environment.

  Therefore, even when both blasting and painting were performed using a single working room, ventilation was possible under optimal conditions for blasting and painting.

  By forming the partition wall 25 by either one of the dust collector unit 20 and the paint ventilation unit 30 projectingly disposed in the main body 10 (in the embodiment, the dust collector unit 20), both the dust collector unit 20 and the paint ventilation unit 30 are provided. Compared with the case where it is arranged outside the main body 10, the entire work chamber 1 can be compactly gathered.

  Here, in the illustrated embodiment, when ventilation is performed by the painting ventilation unit 30 through the opening 12a provided in the other side wall 12 during painting, the flow of air from the work space 10a is outlined in FIG. As shown by the arrows, the paint ventilation unit is introduced to the paint ventilation unit 30 side through the opening 12a before being introduced to the suction port 22 side of the dust collector unit 20, so that the paint ventilation unit is opened with the suction port 22 of the dust collector unit 20 open. Even when ventilation by 30 is performed, it is difficult for paint particles to be introduced into the dust collector unit 20 side.

  On the other hand, when ventilation by the dust collector unit 20 is performed at the time of blasting, the air in the work space 10a is introduced into the ventilation duct 10b as shown by the white arrow in FIG. Therefore, if ventilation is performed with the opening 12a provided in the other side wall 12 open, dust contained in the airflow will cause the opening 12a to flow through the inlet 12a. There is a case where the filtration life of the collecting means 32 is shortened by colliding with the collecting means 32 such as the baffle plate 32a or the secondary filter 32b of the coating ventilation unit 30.

  However, as described above, by providing the first opening / closing means 12b (the cover plate for opening / closing the opening 12a in the embodiment) 12b for opening and closing the opening 12a, when the dust collector unit 20 performs ventilation, the first opening / closing means 12b opens the opening 12a. As a result, the dust is not introduced into the paint ventilation unit 30 and the filtration performance of the collecting means 32 such as the baffle plate 32a and the secondary filter 32b provided in the paint ventilation unit 30 is lowered as described above. We were able to prevent.

  However, in the configuration shown in the drawing, it is not possible to completely prevent the paint particles from entering the suction port 22 of the dust collector unit 20 even when the paint ventilation unit 30 is ventilated. Means may be provided so that the suction port 22 of the dust collector unit 20 can be closed during ventilation by the paint ventilation unit 30.

  When the first opening / closing means 12b is provided in the opening 12a in a configuration in which the arrangement of the dust collector unit 20 and the paint ventilation unit 30 is opposite to that of the illustrated embodiment, the dust collector unit is ventilated by the paint ventilation unit 30. In this case, an opening / closing means for opening / closing the suction port may be provided on the coating ventilation unit 30 side.

  By setting the ventilation air volume per minute by the dust collector unit 20 to 1.5 times or more the volume in the main body 10, even if dust or the like is generated, the work space 10a is ventilated in a relatively short time. We were able to keep it clean.

  If the paint particle collecting means 32 provided in the paint ventilation unit 30 is provided with a baffle plate 32a, the paint particles are collected by collision with the baffle plate 32a. In this case, there was no problem that the suction wind speed was reduced due to clogging, and the ventilation could be performed stably for a long time.

  Further, since the paint particles are collected by the dry method using the baffle plate 32a, the wet collection method, that is, means for collecting the paint particles by passing the exhaust through the water stretched in the water tank. Therefore, it is not necessary to perform complicated work such as waste water treatment, which is necessary when adopting, and maintenance can be performed by a relatively simple work of replacing the baffle plate 32a.

  Further, the air flow velocity in the work space 10a generated by the ventilation by the paint ventilation unit 30 is 0.4 m / s or more, the ventilation air volume by the paint ventilation unit 30 is set to the ventilation air volume by the dust collector unit 20. In the configuration of 2 to 7 times, even when coating is performed with the entrance / exit 11a opened as described above, paint particles do not leak out of the work space 10a from the entrance / exit 11a. , A large amount of outside air is introduced into the work space 10a, so that the work space 10a can be maintained in a clean space, and the paint particles are transported on the airflow by carrying the paint particles on the airflow. It was able to be more reliably introduced and collected in the paint ventilation unit 30 before falling on and adhering to.

  The abrasive recovery duct 41 that opens toward the work space 10a communicates with the inlet 42a of the cyclone 42, and the exhaust duct 43 that communicates with the exhaust outlet 42b of the cyclone 42 communicates with the ventilation duct 10b to recover the abrasive. When the second opening / closing means 44 and the third opening / closing means 45 are provided, the exhaust duct 43 and the suction port 22 of the dust collector unit 20 are communicated by the second opening / closing means 44. By closing the flow path in the ventilation duct 10b below the suction port 22 of the dust collector unit 20 by the third opening / closing means 45 and bringing the dust collector unit 20 into an activated state, the dust collector unit 20 causes the ventilation duct 10b and the exhaust duct to operate. 43, the intake air in the work space 10a is taken in through the cyclone 42 and the abrasive recovery duct 41. The abrasive and dust accumulated on the floor board 16 can be collected by, for example, scissors and put into the opening of the abrasive collection duct 41 to collect the abrasive and dust in the work space 10a. Of these, the abrasives to be reused could be recovered by the cyclone 42.

  In addition, air containing dust after the abrasive is collected by the cyclone 42 is introduced into the dust collector unit 20 through the exhaust duct 43 and the ventilation duct 10b and collected. It was possible to exhaust the clean air from which the air was removed.

  Further, in the configuration in which the flexible abrasive recovery hose 47 that can communicate with the opening of the abrasive recovery duct 41 is provided, the abrasive recovery hose 47 is connected to the opening of the abrasive recovery duct 41. As described above, by extending the abrasive recovery duct 41, the open end of the abrasive recovery hose 47 is moved to an appropriate position in the work space 10a and the abrasive or dust on the floor 16 is sucked. In addition, the worker M no longer needs to sweep up and collect the abrasive or dust accumulated on the floor board 16 using a scissors or the like.

  An opening plate 61 such as grating is laid on the floor plate 16 in the work space 10a at a predetermined interval to form an abrasive recovery space 62 between the floor plate 16 and the opening plate 61. , The abrasive recovery duct 41 ′ opening toward the recovery space 62 is communicated with the introduction port of the cyclone 42 ′, and the exhaust duct 43 ′ communicated with the exhaust port of the cyclone 42 ′ is provided with the exhaust fan 51. In the configuration in which the abrasive recovery unit 40 ′ is formed in communication with the dust collector 50 and the closing means 63 for closing the aperture of the aperture plate 61 is provided in the painting process, the exhaust fan of the dust collector 50 is provided. By sucking the inside of the collection space 62 by 51, the abrasive can be collected simultaneously with the ventilation in the work space 10a by the dust collector unit 20 at the time of blasting. The in between 10a could be kept clean.

  Further, during coating, the opening of the aperture plate 62 is blocked by the closing means 63, so that the paint particles can be prevented from entering the recovery space 62, the paint can be prevented from being mixed into the abrasive material, and the interior of the recovery space 62 can be prevented. Even when the abrasive or dust remained in the film, it was possible to suitably prevent the abrasive or dust from rising and mixing into the coating film.

Explanatory drawing which showed the state at the time of the blasting of the blast chamber (Embodiment 1) of this invention. II-II sectional view taken on the line of FIG. Explanatory drawing which showed the state at the time of the painting of the blast chamber (Embodiment 1) of this invention. The perspective view of a painting ventilation unit. Explanatory drawing which showed the state at the time of the blasting of the blast chamber (Embodiment 2) of this invention. Explanatory drawing which showed the state at the time of abrasive | polishing material collection | recovery of the blast chamber (Embodiment 2) of this invention. Explanatory drawing which showed the state at the time of the painting of the blast chamber (Embodiment 2) of this invention. Explanatory drawing which showed the state at the time of the blasting of the blasting chamber (Embodiment 3) of this invention (abrasive material collection | recovery is used together). Explanatory drawing which showed the state at the time of the painting of the blast chamber (Embodiment 3) of this invention.

  Next, the blast chamber 1 of the present invention will be described with reference to the accompanying drawings.

Embodiment 1
Overall Configuration Reference numeral 1 in FIGS. 1 to 3 is a blast chamber of the present invention (also simply referred to as “work chamber” in the present specification), and this work chamber 1 is shown in FIGS. 1 and 2. In addition, the worker M is configured to be able to enter and work with the workpiece W. The substantially box-shaped main body 10 surrounded by the side walls 11 to 14, the top plate 15 and the floor plate 16, and at the time of blasting A dust collector unit 20 that ventilates the main body 10 and a paint ventilation unit 30 that ventilates the main body 10 during painting are provided.

Main body The above-mentioned main body 10 constituting the working chamber 1 of the present invention is, for example, a metal box formed by two opposing side walls (11, 12 and 13, 14), a top plate 15 and a floor plate 16. In the main body 10, there is formed a work space 10a in which the worker M enters the work W together with blasting and painting.

  The top plate 15 of the main body 10 is provided with a large number of intake holes 17 for introducing outside air into the work space 10a of the main body 10, and preferably provided uniformly and at regular intervals over the entire top plate 15 positioned on the work space 10a. When the space in the main body 10 is sucked by performing ventilation with the dust collector unit 20 and the paint exhaust unit 30 described later, the outside air is introduced downward into the main body 10 through the intake holes 17 provided in the top plate 15. Is configured to be introduced.

  In addition, the work W is carried into and out of the main body 10 on one side wall 11 constituting one set (11, 12) of the two sets of opposing side walls 11, 12; An entrance / exit 11a that allows the worker M to enter and leave the room is provided, and an opening / closing body 11b that is a door or shutter that opens and closes the entrance / exit 11a.

  Further, an opening 12a is provided in the other side wall 12 opposite to the one side wall 11, and a painting ventilation unit 30 (to be described later) can suck the inside of the main body 10 through the opening 12a. .

  The opening 12a is provided with first opening / closing means 12b which is a cover plate for opening and closing the opening 12a. The opening 12a is closed by the first opening / closing means 12b during blasting and when the coating is applied. 12a can be opened.

  In the illustrated example, the paint ventilation unit 30 is communicated through the opening 12a. However, instead of this configuration, the dust collector unit 20 described later is communicated. The arrangement of the paint ventilation unit 30 may be reversed.

  In the main body 10, the bottom plate 25 protrudes from the top plate 15 toward the floor plate 16 at a position near the other side wall 12, and the lower end 25 a is spaced apart from the floor plate 16 at a predetermined high position. Arranged partition walls 25 are provided.

  As shown in FIG. 2, the partition wall 25 has a width corresponding to the interval between the side wall 13 and 14 disposed in the direction orthogonal to the one side wall 11 provided with the entrance / exit 11a. An interior space is partitioned, and a work space 10a is formed in the main body 10 on the side wall 11 side with respect to the partition wall 25. On the other side wall 12 side with respect to 25, a ventilation duct 10b having a lower end communicating with the work space 10a is formed.

  As shown in FIGS. 1 and 3, the lower end portion of the other side wall 12 of the main body is inclined so as to approach the working space 10a as it goes downward, and is ventilated by a dust collector unit 20 or a paint ventilation unit 30 described later. The air flow that flows into the ventilation duct 10b from the work space 10a side when sucked in the duct 10b can be smoothly introduced into the ventilation duct 10b.

  In the illustrated embodiment, the partition wall 25 is formed by projecting a dust collector unit 20 described later into the main body 10, and the partition wall 25 also serves as a casing of the dust collector unit 20. Therefore, the components of the dust collector unit 20 such as a filter (not shown) are accommodated in the wall thickness of the partition wall 25.

  In the illustrated embodiment, the partition wall 25 is formed by the casing of the dust collector unit 20, but the partition wall 25 and the dust collector unit 20 are formed completely separately, for example, on the side wall of the main body 10. It is good also as what is connected to the said ventilation duct 10b through opening.

  Further, instead of the illustrated configuration, the partition wall 25 may be formed by reversing the arrangement of the dust collector unit 20 and the paint ventilation unit 30 as described above and projecting the paint ventilation unit 30 into the main body 10. good.

  The floor plate 16 of the main body 10 is provided with an unillustrated aperture plate, preferably a relatively thick aperture plate such as a grating, so that the abrasive material injected during the blasting process or the abrasive material injection When the dust generated by the liquid drops and reaches the floor plate 16, it may enter into the aperture formed in the aperture plate and be less likely to re-float.

  In this case, the aperture plate is simply placed on the floor plate 16 so that it can be easily removed, and when the abrasive is recovered, the aperture plate is removed from the floor plate 16 to remove the aperture plate. For example, it may be configured such that the abrasive deposited thereon can be collected by sweeping with a scissors or the like.

Dust Collector Unit The main body 10 configured as described above is provided with a dust collector unit 20 that ventilates the main body 10 during blasting.

  The dust collector unit 20 sucks the air in the work space 10a through the ventilation duct 10b and the sucked air in the work space 10a by the operation of the exhaust fan 21 provided in the dust collector unit 20. In the illustrated embodiment, the dust collector unit 20 is connected to a dust collecting means (not shown) such as a filter provided in the filter and exhausted after removing the dust. By disposing the main body 10 so as to protrude from the top plate 15 side, the casing of the dust collector unit 20 also serves as the partition wall 25 described above.

  Then, as shown in FIG. 2, a suction port 22 is provided on the side surface of the partition wall 25 which is the casing of the dust collector unit 20 on the side of the ventilation duct 10b, and by the operation of the exhaust fan 21, the suction port 22 is passed through the ventilation duct 10b. The air in the work space 10 a can be introduced into the dust collector unit 20.

  Although not provided in the illustrated configuration, the suction port 22 is preferably opened when ventilation is performed by the dust collector unit 20, and the suction port 22 is closed when ventilation is performed by the painting ventilation unit 30, which will be described later. Opening and closing means are provided.

  The exhaust fan 21 provided in the dust collector unit 20 sucks abrasives accumulated on the floor plate 16 of the work space 10a into the dust collector unit 20 when ventilating the work space 10a through the ventilation duct 10b. Preferably, the air velocity in the ventilation duct 10b is adjusted so as not to exceed the floating velocity of the abrasive used, while the work space 10a is preferably ventilated in a relatively short time. It is preferable to use an exhaust fan that generates a ventilation air volume that is 1.5 times or more the volume in the working chamber 1 per minute.

Paint Ventilation Unit Reference numeral 30 in FIGS. 1, 3, and 4 is a paint ventilation unit that ventilates the inside of the main body 10 during painting, and the main body 10 through the opening 12 a provided in the other side wall 12 of the main body 10 described above. It communicates with the ventilation duct 10b in the inside, and is configured to be able to suck air in the work space 10a through the ventilation duct 10b.

  The paint ventilation unit 30 sucks air in the work space 10a of the main body 10 by driving the exhaust fan 31 and introduces it into a collecting means 32 for collecting paint particles contained in the air. It is configured so that clean particles can be exhausted by collecting paint particles present in the form of mist.

  In the present embodiment, a baffle plate (primary filter) 32a and a secondary filter 32b disposed behind the baffle plate 32a are provided as the above-described collecting means 32 for collecting paint particles.

  Among them, the baffle plate 32a is a plate body standing upright in the air flow path as shown in FIG. 4, and in this embodiment, the baffle having a substantially U-shaped cross section in the width direction. The plates 32a are alternately meshed in opposite directions, and when the air flow meanders through the gaps formed between the baffle plates 32a as indicated by arrows in the figure, the paint particles in the air are baffled. By colliding with the surface of the plate 32a and collecting it, most of the paint particles in the air can be collected.

  The paint particles that cannot be collected by the baffle plate 32a and remain slightly in the air are secondary filters that are arranged behind the baffle plate 32a and are, for example, a known filter of a non-woven fabric. Collected by filtration.

  The exhaust fan 31 provided in the paint ventilation unit 30 is one that can generate an air velocity of 0.4 m / s or more in the work space 10a, and is provided in the dust collector unit 20 described above. It is preferable to use one that generates 2 to 7 times the ventilation air flow compared to the exhaust fan, so that the sprayed paint fines are sucked before the paint reaches the floor in the work space, etc. It is configured so that it can be collected by the unit.

  In the present embodiment, since the surface of the baffle plate 32a is subjected to special processing for increasing the collection efficiency of the paint particles, the collection efficiency of the paint particles by the baffle plate 32a is high. By adopting the double filtration method by combining the baffle plate 32a and the secondary filter 32b described above, a high collection efficiency of 90% or more for melamine paint and 85% or more for lacquer primer can be realized. It has become.

  In the configuration of the present embodiment in which the paint particles are collected by the combination of the baffle plate 32a as the primary filter and the secondary filter 32b in this way, most of the paint particles are baffle plates 32a. Therefore, the amount of the paint particles collected by the secondary filter 32b is small, and the secondary filter 32b is not easily clogged. As a result, the coating particles are continuously collected for a relatively long time. Even if it is used, the suction wind speed of the paint ventilation unit 30 does not decrease, and the work room can be well ventilated.

  In addition, by collecting the paint particles by a dry method such as a baffle plate 32a and a secondary filter 32b, a wet process is performed by collecting the paint particles in the water by passing the exhaust water in the water tank. As in the case of adopting the collection method, complicated work such as treatment of water used for collection is not necessary, and maintenance can be performed by a simple work of replacing the baffle plate 32a or the secondary filter 32b. There is an advantage that you can.

Functions, etc. When the work chamber 1 of the present invention configured as described above is used to perform blast processing on the workpiece W and to coat the workpiece after blast processing, each part of the work chamber 1 Will be described.

  Prior to processing the workpiece W, the opening / closing body 11b provided on one side wall 11 of the main body 10 of the work chamber 1 is opened, and the workpiece W to be processed is carried into the work space 10a. The worker M who performs the operation enters the work space 10a.

  In the following description, it is assumed that the work on the workpiece W is performed by the worker M. For example, instead of the worker M, a work robot or the like is carried into the work space 10a together with the work W to perform the work. It is good also as what performs work in the space 10a unmanned.

  When blasting the workpiece W, as shown in FIG. 1, the entrance / exit 11a formed in one side wall 11 is closed by the opening / closing body 11b so that the abrasive or dust does not leak out of the working chamber 1. To do.

  Then, the opening 12a provided in the other side wall 12 is closed by the first opening / closing means 12b, the exhaust fan 21 of the dust collector unit 20 is turned on, and the exhaust fan 31 of the painting ventilation unit 30 is turned off. The worker M performs blasting by injecting an abrasive material supplied from an unillustrated abrasive material pressure feeding device from a blast gun held in his hand to a necessary portion of the surface of the workpiece W.

  By turning on the exhaust fan 21 provided in the dust collector unit 20, the dust collector unit 20 sucks air in the work space 10 a from the suction port 22 through the ventilation duct 10 b and exhausts it outside the main body 10. The outside air is introduced downward into the work space 10a, which has become a negative pressure due to the suction, as shown by an arrow in FIG. 1 through an intake hole 17 provided in the top plate 15 of the main body 10.

  Then, the air in the work space 10a is sucked into the suction port 22 of the dust collector unit 20 from the space between the floor plate 16 of the main body 10 and the lower end 25a of the partition wall 25 through the ventilation duct 10b, and enters the dust collector unit 20 into the air. After the contained dust is removed, clean air is exhausted.

  In this embodiment, as an example, the performance of the exhaust fan 21 provided in the dust collector unit 20 is one that can generate an air volume capable of exhausting 1.5 times the volume of the space in the main body 10 in one minute. As a result, the dust generated by the blasting process can be immediately removed, and the work space 10a can be maintained in a clean and comfortable space.

  In this way, outside air is introduced into the work space 10a through the air intake holes 17 formed in the top plate 15, and a ventilation duct that opens the air in the work space 10a at a position close to the floor plate 16 is provided. Since the operation is performed through 10b, a downward air flow from the top plate 15 side toward the floor plate 16 side is generated in the work space 10a as indicated by an arrow in FIG.

  For this reason, the sprayed abrasive and dust generated during blasting move so as to be pressed against the floor plate 16 by this air flow, and fall and accumulate on the floor plate 16 in a relatively short time. The abrasives and dusts that fall and accumulate on the surface are wound up by the air flow generated with ventilation and are difficult to re-float.

  After the blasting process is completed as described above, the abrasive and dust deposited on the floor board 16 are removed by sweeping them up with a scissors or the like as necessary. As described above, when an aperture plate such as grating is laid on the floor plate 16, the aperture plate is removed once, and then the abrasive and dust deposited on the surface of the floor plate 16 may be recovered. good.

  In addition, when removing abrasives and dust by sweeping up with a scissors in this way, dust accumulated on the floor board 16 may float again and contaminate the work space during this work. Then, the entrance / exit 11a is closed, the opening 12a is closed by the first opening / closing means 12b, and the exhaust fan 21 of the dust collector unit 20 is turned on (the exhaust fan 31 of the paint ventilation unit 30 is turned off). It is preferable to maintain ventilation and to continue ventilation in the work space 10a.

  In addition, without collecting such abrasives, for example, on the floor plate 16 in a state where abrasives and dust are deposited (on an aperture plate such as a grating, etc.) For example, by covering with a protective sheet, the dust accumulated on the floorboard floats and mixes into the coating during the next process, and on the floorboard that is later recovered and reused. It is also possible to prevent the paint from being mixed into the abrasive deposited on the surface.

  As described above, the removal of the abrasives and dust accumulated on the floor board 16 is completed and / or the paint is applied to the work W which has been subjected to the blasting process with the floor board 16 covered with a protective sheet or the like. Is done.

  At the time of painting, as shown in FIG. 3, the opening 12a provided on the other side wall 12 of the main body is opened by operating the first opening / closing means 12b, and the painting ventilation unit 30 communicates with the ventilation duct 10b. The exhaust fan 31 provided on the dust collector unit 20 is turned on, and the exhaust fan 21 provided on the dust collector unit 20 is turned off to ventilate the work space 10 a by the painting ventilation unit 30.

  At this time, the opening / closing door 11b provided on one side wall 11 of the main body 10 is opened, the entrance / exit 11a is opened, and an air flow flowing from the entrance / exit 11a toward the opening 12a is generated as indicated by a white arrow in FIG. In this state, the paint is sprayed to coat the workpiece W.

  Thus, when the exhaust fan 31 provided in the painting ventilation unit 30 is turned on with the entrance / exit 11a opened, outside air is introduced into the work space 10a through the air intake holes 17 provided in the top plate 15. In addition, a larger amount of outside air is introduced through the entrance / exit 11a, and an air flow that flows from the left side to the right side in the drawing is generated in the work space 10a as indicated by a white arrow in FIG.

  Here, the paint sprayed in the work space 10a is in the form of fine particles and is lighter than an abrasive or the like. Therefore, the paint sprays on the air flow generated in the work space 10a by the paint ventilation unit 30. Even when the coating is performed with the entrance / exit 11a open, it does not leak out of the main body 10 due to the generation of an air flow from the entrance / exit 11a toward the opening 12a. Before arriving, the air passes through the working space 10a and the ventilation duct 10b and is sucked into the painting ventilation unit 30 through the opening 12a, and the paint particles are collected by the baffle plate 32a and the secondary filter 32b. Is discharged out of the machine.

  In addition, since the paint particles move in the work space 10a from the entrance / exit 11a side toward the opening 12a side for a relatively long distance, the paint particles are easily dried during the movement, and the collection efficiency by the paint ventilation unit 30 is improved. .

  Furthermore, as described above, since an airflow is generated in the work space 10a from the inlet / outlet port 11a toward the opening 12a, the abrasive and dust left during the recovery of the abrasive and dust are removed from the floor plate 16. Even if they remain on the surface, these abrasives and dusts move so as to crawl on the floor plate 16 and hardly roll up. As a result, it is possible to prevent the abrasives and dusts from being mixed into the coating film.

  In particular, the ventilation air volume of the exhaust fan 31 provided in the paint ventilation unit 30 is larger than the ventilation air volume by the exhaust fan 21 provided in the dust collector unit 20, and as an example 2 to 7 times, a large amount in the work space 10a. The outside air is introduced and maintained in a clean state, and the leakage of the paint particles through the opened inlet / outlet port 11a can be more reliably prevented, and the paint particles can be more reliably applied without reaching the floor plate 16. It becomes possible to introduce into the ventilation unit 30.

Embodiment 2
Another structural example (Embodiment 2) of the working chamber 1 of the present invention will be described with reference to FIGS.

  In the working chamber 1 of this embodiment shown in FIGS. 5 to 7, an abrasive recovery unit 40 including an abrasive recovery duct 41, a cyclone 42, and an exhaust duct 43 is provided, and in the ventilation duct 10b. Although it is different from the working chamber 1 of the first embodiment described with reference to FIGS. 1 to 4 in that the second and third opening / closing means 44 and 45 are provided, in other configurations, Since it is the structure similar to the working chamber 1 of Embodiment 1 demonstrated with reference to FIGS. 1-4, it abbreviate | omits description of a common part.

  The cyclone 42 constituting the above-described abrasive recovery unit 40 generates a swirling flow by the air flow passing through the inside, and separates and falls by removing relatively heavy abrasive from the air flow by centrifugal force. In addition to being recovered, the dust that is lighter than the abrasive is placed on the air stream and discharged, so that the abrasive that is reused can be separated and recovered.

  An abrasive tank 42c for storing the recovered abrasive can be provided at the lower end of the cyclone 42, and the abrasive tank 42c is recovered in the abrasive recovery tank 42c. Abrasive material feeding means (not shown) for feeding the abrasive material to a blast gun arranged in the work space 10a may be provided.

  As shown in FIGS. 5 to 7, the introduction port 42 a of the cyclone 42 communicates with the work space 10 a via the abrasive material recovery duct 41, and the exhaust port 42 b of the cyclone 42 passes through the exhaust duct 43. And communicated with the ventilation duct 10b formed in the main body 10.

  In the present embodiment, the lower end of the opening of the abrasive recovery duct 41 is opened toward the work space 10a so as to be at the same height as the floor plate 16 of the main body 10, and on the floor plate 16 as shown in FIG. The worker M sweeps the accumulated abrasive and dust into the opening of the abrasive collection duct 41 using a scissors or the like so that the abrasive and dust can be sucked into the abrasive collection duct 41. It is composed.

  Further, the exhaust duct 43 communicated with the exhaust port 42 b of the cyclone 42 is communicated with the ventilation duct 10 b described above via the top plate 15 of the main body 10.

  The ventilation duct 10b is provided with the second opening / closing means 44 and the third opening / closing means 45 described above, and the second opening / closing means 44 is a flow between the exhaust duct 43 and the suction port 22 of the dust collector unit 20. In this embodiment, the suction opening of the dust collector unit 20 is opened and closed by opening and closing the ventilation duct 10b above the suction port 22 of the dust collector unit 20 by the second opening and closing means 44 that is a plate. Communication and blocking between the port 22 and the exhaust duct 43 are possible.

  The third opening / closing means opens and closes the flow passage in the ventilation duct 10b at a position below both the suction port 22 and the opening 12a of the dust collector unit 20. The air flow from 10a to the dust collector unit 20 is controlled.

  A flexible abrasive material recovery hose 47 can be connected to the opening of the above-mentioned abrasive material recovery duct 41 via an adapter 46 or the like as shown in FIG. The opening of the duct 41 may be extended, and the abrasive collection hose 47 is connected in this manner to extend the opening of the abrasive collection duct 41, thereby polishing the open end of the abrasive collection hose 47. You may comprise so that it can collect | recover abrasive | polishing material, without sweeping up the abrasive | polishing material and dust which accumulated on the floor board 16 of the main body 10 by moving to the position where the material and dust accumulated.

  In the working chamber 1 of the present embodiment configured as described above, at the time of blasting, as shown in FIG. 5, the second opening / closing means 44 is a position that blocks communication between the exhaust duct 43 and the suction port 22 of the dust collector unit 20. In addition, the third opening / closing means 45 is set to a position where the ventilation duct 10b is opened.

  In this state, when the entrance / exit 11a is closed, the opening 12a is closed by the first opening / closing means 12b, the exhaust fan 21 of the dust collector unit 20 is turned on, and the exhaust fan 31 of the painting ventilation unit 30 is turned off, with reference to FIG. Ventilation in the work space 10a is performed by the dust collector unit 20 in the same manner as the work chamber in the first embodiment described.

  When the abrasive and dust accumulated on the floor plate 16 of the work space 10a are collected after the blasting is finished, the second opening / closing means 44 is operated as shown in FIG. 6 to operate the exhaust duct 43 and the dust collector unit 20. And the third opening / closing means 45 are operated to close the flow path in the ventilation duct 10b.

  At this time, the opening 12a is kept closed by the first opening / closing means 12b, and the exhaust fan 21 of the dust collector unit 20 is kept on and the exhaust fan 31 of the painting ventilation unit 30 is kept off.

  In this way, when the communication between the suction port 22 of the dust collector unit 20 and the work space 10a is cut off by the third opening / closing means 45, the dust collector unit 20 directly sucks the work space 10a through the ventilation duct 10b. On the other hand, the exhaust duct 43 and the suction port 22 of the dust collector unit 20 communicate with each other, so that the dust collector unit 20 passes through the exhaust duct 43, the cyclone 42, and the abrasive recovery duct 41 in the work space 10a. Start sucking.

  Accordingly, when the abrasive and dust accumulated on the floor plate 16 are swept up into the opening of the abrasive collection duct 41, etc., the introduced abrasive and dust together with the air in the work space 10a are collected. Is introduced into the cyclone 42, and the abrasive is removed and collected by the swirling flow generated in the cyclone 42, and collected in an abrasive tank 42 c provided at the lower part of the cyclone.

  On the other hand, the air containing the dust after the abrasive is removed and collected is introduced into the exhaust duct 43 through the exhaust port 42b of the cyclone 42, and is introduced into the dust collector unit 20 through the ventilation duct 10b.

  The dust is further removed in the dust collector unit 20, and clean air is discharged outside the machine.

  In this way, after the recovery of the abrasive is completed, when coating the blasted workpiece W, the second opening / closing means 44 is sucked into the exhaust duct 43 and the dust collector unit 20 as shown in FIG. The third opening / closing means 45 is set to a position where the ventilation duct 10b is opened at a position where communication between the ports 22 is blocked.

  Further, when the opening 12a closed by the first opening / closing means 12b is opened, the inlet / outlet port 11a is opened, the exhaust fan 21 of the dust collector unit 20 is turned OFF, and the exhaust fan 31 of the paint ventilation unit 30 is turned ON. As in the case of the first embodiment described with reference to FIG. 3, the inside of the work space 10 a during painting is well ventilated, and the sprayed paint particles are provided on the baffle plate 32 a provided in the painting ventilation unit 30. Are collected by the secondary filter 32b, and clean air is exhausted outside the apparatus.

  As described above, in the present embodiment, by providing the above-described abrasive recovery unit 40 and the first and third opening / closing means 44 and 45, the work space 10a is utilized by utilizing the negative pressure generated by the dust collector unit 20. The abrasives and dust deposited on the floor plate 16 can be easily removed, and the reusable abrasives among them can be collected relatively easily, and the dust remaining in the air after the abrasives are collected. Was removed by the dust collector unit 20 and then exhausted outside the apparatus.

Embodiment 3
As described above, in the second embodiment described with reference to FIGS. 5 to 7, ventilation in the work space 10 a through the ventilation duct 10 b by the dust collector unit 20 and the abrasive through the abrasive recovery unit 40. However, the recovery of the abrasive from the work space 10a can be performed simultaneously with the ventilation of the work space 10a by the dust collector unit 20 described above. Also good.

  A configuration example of the work chamber 1 configured as described above will be described as a third embodiment with reference to FIGS. 8 and 9.

  In the embodiment shown in FIGS. 8 and 9, in addition to the abrasive recovery duct 41 ′, the cyclone 42 ′ and the exhaust duct 43 ′, a dust collector provided with a wind exhauster 51 in the configuration of the abrasive recovery unit 40 ′. 50 and an exhaust duct 43 ′ is communicated with the suction port of the dust collector 50.

  And the recovery space which collects the abrasives and dust which fell between the floor board 16 and the aperture plate 61 by laying the aperture plate 61, such as grating, on the floor plate 16 of the main body 10 at a predetermined interval. 62 is formed.

  In the configuration of the working chamber 1 of the present embodiment shown in FIGS. 8 and 9, the second and second working chambers 1 of the second embodiment described with reference to FIGS. 5 to 7 are provided in the ventilation duct 10b. No member corresponding to the three opening / closing means 44, 45 is provided.

  In the working chamber 1 of the present embodiment configured as described above, at the time of blasting, the opening 12a is closed by the first opening / closing means 12b as shown in FIG. 8, and the exhaust fan 21 and dust collector of the dust collector unit 20 are closed. When all of the 50 ventilators 51 are turned ON and the exhaust fan of the painting ventilation unit 30 is turned OFF, the air in the work space 10a in which dust floats is ventilated by the dust collector unit 20 through the ventilation duct 10b. At the same time, the abrasive and dust that have passed through the aperture of the aperture plate 61 and dropped onto the floor plate 16 and recovered in the recovery space 62 are removed by the negative pressure generated by the dust collector 50 by the abrasive recovery unit 40 ′. Then, the abrasive is recovered by the cyclone 42 'of the abrasive recovery unit 40'.

  Then, the air containing the dust after the abrasive is collected is introduced into the dust collector 50 through the exhaust duct 43 ′, collected by a filter provided in the dust collector 50, and the dust is removed. Clean air is discharged outside the machine.

  On the other hand, at the time of painting, the work space 10a and the recovery space 62 are separated by covering the aperture plate 61 with a protective sheet or the like so that the paint particles do not enter the recovery space 62. Are closed by the first opening / closing means 12b, both the exhaust fan 21 of the dust collector unit 20 and the exhaust fan 51 of the dust collector 50 are turned OFF, and the exhaust fan 31 of the painting ventilation unit 30 is turned ON. As in the case described, ventilation in the work space 10a by the paint ventilation unit 30 can be suitably performed.

  In the above description, the work space 10a and the recovery space 62 are separated by covering the aperture plate 61 with a protective sheet. However, for example, a shutter-like member that slides on the lower surface of the aperture plate 62 May be provided so that the two spaces are divided, or the two spaces may be automatically divided.

  In the work chamber 1 of the present embodiment configured as described above, it is not necessary to provide a process for removing and collecting the abrasive in the work space 10a when shifting from blasting to painting. This is advantageous in that it can be applied immediately and the processing time can be further shortened.

  In addition, since the abrasive and dust accumulated on the floor plate 16 are appropriately collected during the blasting process, the contamination in the work space 10a due to the re-floating of the abrasive and dust accumulated on the floor plate 16 is further generated. It has become difficult.

  Although details are omitted in the collection space 62, the floor plate is partitioned by a mesh body that can be passed through an abrasive material proposed by the applicant in Japanese Patent Laid-Open No. 2009-95892, and the mesh body is used as a floor surface. A blast chamber is formed, and a plurality of substantially inverted quadrangular pyramid-shaped hoppers are arranged below the mesh body so that the upper part opens toward the mesh body, and the lower ends of the hoppers are connected via a collection pipe. By providing an abrasive recovery mechanism that communicates with suction means (not shown) such as a dust collector, it is possible to improve the efficiency of the abrasive and dust recovery without hindering the reduction in flooring.

DESCRIPTION OF SYMBOLS 1 Blasting room (blast processing room and coating process room), work room 10 Main body 10a Work space 10b Ventilation duct 11 Side wall (one side)
11a Entrance / exit 11b Open / close body 12 Side wall (other side)
12a Opening 12b First opening / closing means 13, 14 Side wall 15 Top plate 16 Floor plate 17 Air intake hole 20 Dust collector unit 21 Air exhauster 22 Air inlet 25 Bulkhead (Dust collector unit casing)
25a Lower end (of partition 25)
DESCRIPTION OF SYMBOLS 30 Paint ventilation unit 31 Blower 32 Collecting means 32a Baffle plate 32b Secondary filter 40, 40 'Abrasive material recovery unit 41, 41' Abrasive material recovery duct 42, 42 'Cyclone 42a Inlet 42b Exhaust port 42c Abrasive material tank 43 , 43 'Exhaust duct 44 Second opening / closing means 45 Third opening / closing means 46 Adapter 47 Abrasive recovery hose 50 Dust collector 51 Ventilator 61 Opening plate 62 Collection space 63 Closure means M Worker W Workpiece

Claims (10)

A box-shaped body surrounded by side walls, a top plate and a floor plate;
A dust collector unit that is actuated during blasting operation and that sucks dust floating in the main body together with air in the main body and collects dust in the air and exhausts clean air;
A paint ventilation unit that is activated during the painting process and sucks the paint particles floating in the main body together with the air in the main body, and collects the paint particles in the air and exhausts clean air from which the paint particles are removed. Provided
An opening / closing body for opening and closing the entrance / exit for opening / closing the entrance / exit and a door for carrying a workpiece in / out and a worker entering / exiting the chamber are provided on any one side wall of the main body, and near the other side wall facing the one side wall. Providing a partition wall in the body that protrudes from the top plate toward the floor plate and having a lower end spaced apart at a predetermined high position with respect to the floor plate, and partitioning the space in the main body by the partition wall, Forming a work space between the one side wall and the partition wall, and forming a ventilation duct having a lower end side communicating with the work space at an interval between the partition wall and the other side wall;
A number of intake holes for introducing outside air into the work space are formed in the top plate above the work space,
The dust collector unit and the paint ventilation unit communicate with the ventilation duct, respectively, and the suction air speed of the dust collector unit is set so that the wind speed in the ventilation duct is equal to or lower than the floating speed of the abrasive used. Blast room. The dust collector unit that forms the partition wall by forming either the dust collector unit or the paint ventilation unit in a projecting manner in the main body, and forms the partition wall on a surface facing the other side wall of the partition wall Or form the inlet of the paint ventilation unit,
2. The blast chamber according to claim 1, wherein an opening for communicating the other side of the dust collector unit or the paint ventilation unit with the ventilation duct is formed in the other side wall.   The blast chamber according to claim 2, further comprising first opening / closing means for opening and closing the opening.   The blast chamber according to any one of claims 1 to 3, wherein a ventilation air volume per minute by the dust collector unit is 1.5 times or more a volume in the main body.   The blast chamber according to any one of claims 1 to 4, wherein the paint ventilation unit includes a baffle plate as a means for collecting paint particles.   The blast chamber according to any one of claims 1 to 5, wherein an air velocity in the work space generated by ventilation by the paint ventilation unit is set to 0.4 m / s or more.   The blast chamber according to any one of claims 1 to 6, wherein the ventilation air volume by the paint ventilation unit is 2 to 7 times the ventilation air volume by the dust collector unit. An abrasive recovery duct that opens at one end toward the work space at the lower end position of one of the side walls of the main body, a cyclone that communicates with an inlet at the other end of the abrasive recovery duct, and an exhaust port of the cyclone A polishing material recovery unit comprising one end and an exhaust duct communicating with the ventilation duct at the other end is provided.
Second opening / closing means for communicating or blocking between the exhaust duct and the suction port of the dust collector unit;
The blast chamber according to any one of claims 1 to 7, further comprising third opening / closing means for opening and closing a flow path in the ventilation duct below a communication position of the dust collector unit and the paint ventilation unit.   The blast chamber according to claim 8, wherein a flexible abrasive recovery hose is provided so as to be connectable to an opening of the abrasive recovery duct. An abrasive plate is laid on the floor plate in the work space at a predetermined interval to form an abrasive recovery space between the floor plate and the aperture plate and open toward the recovery space The recovery duct communicates with the cyclone inlet, and the exhaust duct communicated with the cyclone exhaust vent communicates with a dust collector equipped with a ventilator to form an abrasive recovery unit.
The blast chamber according to any one of claims 1 to 7, further comprising a closing means for closing the aperture of the aperture plate during the coating process.

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