JP2006142208A - Coating booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating booth capable of enhancing coating efficiency by suppressing the generation of a drift. <P>SOLUTION: The booth 1 is provided with a coating chamber 3 and an exhausting chamber 12. A flow plate 14 partitioning the inside of the exhausting chamber 12 into an upper part and a lower part is installed, and water supply pipes 14a, 14b supplying water to the upper surface side of the flow plate 14 are installed. Gas-liquid flowing down parts 22a, 22b are formed by opening to the flow plate 14. A guide plate 16 is installed at the lower side of the flow plate 14. The guide plate 16 introduces contaminated air and water flowing down through the gas-liquid flowing down parts 22a, 22b to the vicinity of a side wall 12c of one side in the exhausting chamber 12. A narrow flow passage 17 is formed between the tip end of the guide plate 16 and the side wall 12c. The gas-liquid flowing down parts 22a, 22b are arranged along the transfer direction D1 of a material to be coated 2 at the position nearly just under both the side surfaces 2a, 2b in the material to be coated 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a coating chamber including a coating chamber in which coating is performed on an object to be transported, and an exhaust chamber that is installed in a lower portion of the coating chamber and performs processing of contaminated air sucked from the coating chamber. It is about the booth.

  In general, when atomization coating is performed on an object to be coated in a coating booth, a contaminated air containing a paint mist, a volatile organic solvent, or the like is filled by the overspray. As a result, the quality of the object to be coated may be impaired by the fog of the paint mist, or the health of the worker may be harmed by the volatile organic solvent. In order to solve these problems, a painting booth having a structure for sucking contaminated air and discharging it outside the painting chamber has been proposed.

However, from the viewpoint of pollution prevention, the contaminated air in the painting chamber cannot be released into the atmosphere as it is. Therefore, in recent years, a painting booth 51 having a structure as shown in FIG. 4 has been proposed. In the case of the painting booth 51, an exhaust chamber 53 is installed in the lower part of the painting chamber 52, and the contaminated air sucked from the painting chamber 52 is purified in the exhaust chamber 53. The inside of the exhaust chamber 53 is partitioned vertically by a flow plate 54. Usually, only one row of gas-liquid flow lower portions 55 is formed in the center of the flow plate 54 (that is, a position immediately below the workpiece W1). An inclined guide plate 56 is disposed below the flow plate 54. The contaminated air and liquid that have flowed down through the gas-liquid flow lower portion 55 are guided by the guide plate 56 and flow downward. The front end of the guide plate 56 reaches the vicinity of one side wall 57 in the exhaust chamber 53, and a narrow channel 58 is formed there. For this reason, when the fluid passes through the narrow channel 58 and is atomized, the paint mist contained in the contaminated air is trapped. The prior art having a structure similar to that of FIG. 4 is also disclosed in, for example, Patent Document 1 below.
JP-A-8-71468 (FIG. 1 etc.)

  However, in the case of the conventional painting booth 51, the narrow flow path 58 is formed by bringing the front end of the guide plate 56 close to one side wall 57 in the exhaust chamber 53, and therefore, the difference in the flow rate of the wind flowing in the booth. Expands from side to side, leading to the occurrence of drift. For this reason, there exists a problem that the location where coating efficiency is partially produced will arise. In the painting booth 51 of FIG. 4, the wind flow rate on the right side of the article W1 tends to be larger than the wind flow rate on the left side.

  This invention is made | formed in view of said subject, The objective is to provide the coating booth which can improve coating efficiency by suppressing generation | occurrence | production of a drift.

  In order to solve the above-mentioned problem, in the invention according to claim 1, a coating chamber in which coating is performed on an object to be transported, and a contamination that is installed in a lower portion of the coating chamber and sucked from the coating chamber. An overflow chamber for processing air, and an overflow plate for vertically partitioning the exhaust chamber, and a water supply means for supplying a liquid to the upper surface side of the overflow plate is provided. A guide member that guides contaminated air and liquid flowing down through the gas-liquid lower portion formed in the opening to the vicinity of one side wall of the exhaust chamber is provided below the overflow plate, and the leading end of the guide member and the side wall A narrow flow path is formed between the two parts of the painting booth at a position substantially below both side surfaces of the painting object along the conveying direction of the painting object. A painting booth characterized by And of the subject matter.

  Therefore, according to the first aspect of the present invention, by disposing the gas-liquid lower portions at positions substantially directly below both side surfaces of the object to be coated, the difference in wind flow between the left and right sides of the booth is reduced. The occurrence of drift in the inside is suppressed. As a result, the coating efficiency can be improved, thereby improving the quality of the coating.

  Note that “a position that is substantially directly below both side surfaces of the object to be coated” does not mean only a position that is directly below both side surfaces of the object to be coated, but from a position directly below both side surfaces of the object to be coated. A position slightly shifted in the width direction is also included. Moreover, it is preferable that the said gas-liquid flow lower part consists of a several opening part arrange | positioned at equal intervals along the conveyance direction of the said to-be-coated article (Claim 2). That is, according to this configuration in which the gas-liquid flow lower part is formed discontinuously along the conveyance direction of the object to be coated, for example, when the gas-liquid flow lower part is continuously formed along the conveyance direction of the object to be coated. In comparison, the washing liquid can be supplied to a relatively large area on the upper surface of the overflow plate. Therefore, the unwashed portion is less likely to occur, and the paint that has fallen on the upper surface of the overflow plate can be reliably washed away.

  It is preferable that the gas-liquid flow lower part is formed in two rows, and a plurality of openings constituting them are arranged in a staggered manner along the conveying direction of the object to be coated (Claim 3). According to this configuration, the washing liquid can be supplied to almost the entire upper surface of the overflow plate. Therefore, it is possible to reliably prevent generation of an unwashed portion, and it is possible to more reliably wash away paint that has fallen on the top surface of the overflow plate.

  As described in detail above, according to the first to third aspects of the present invention, it is possible to provide a coating booth that can improve the coating efficiency by suppressing the occurrence of drift. In particular, according to the second and third aspects of the present invention, since the paint that has fallen on the upper surface of the overflow plate can be washed away with certainty, it is possible to provide a paint booth in which the overflow plate is less likely to become dirty and easy to maintain. .

  Hereinafter, a painting booth 1 according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 (a) and 1 (b).

  As shown in FIG. 1 (a), the painting booth 1 of the present embodiment applies a sprayed atomized paint to the object to be coated 2 (automobile body or the like) to be transported to the surface of the object to be coated 2. An apparatus for forming a film. In the upper part of the painting chamber 3 constituting the main part of the painting booth 1, there is provided an air supply chamber 4 for supplying the downflow B1 that flows uniformly without disturbing the air into the painting chamber 3. In addition, an exhaust chamber 12 is installed in the lower part of the painting chamber 3.

  The exhaust chamber 12 sucks contaminated air in the painting chamber 3 by a suction force of an exhaust fan (not shown), and processes the sucked contaminated air. The contaminated air contains paint mist that is oversprayed from a painting machine (not shown) in the painting chamber 3. In addition, an exhaust duct 13 that exhausts air purified in the exhaust chamber 12 to the outside is provided on one side wall 12 b of the exhaust chamber 12. The air discharged from the exhaust duct 13 is pumped and exhausted by a fan (not shown). A part of the air discharged from the exhaust duct 13 may be led to the air supply chamber 4 again.

  As shown in FIGS. 1A and 1B, the exhaust chamber 12 is provided with a flow plate 14 (overflow plate) that divides the chamber up and down. Although the flow plate 14 is inclined so as to descend from the left and right sides toward the central portion 15, the central portion 15 is horizontal. And the flow plate 14 is formed substantially symmetrically via the booth center line.

  Moreover, the flow plate 14 is provided with water supply pipes 14a and 14b as water supply means at both left and right ends. The water supply pipes 14 a and 14 b are for supplying paint washing water (liquid) to the upper surface side of the flow plate 14. More specifically, the water supply pipes 14a and 14b are provided with a plurality of pipes protruding upward from the flow plate 14 at equal intervals. Therefore, the water in the water supply pipes 14 a and 14 b is supplied from the upper end of each pipe and flows on the flow plate 14 toward the central portion 15. In addition, it may replace with the above water supply pipes 14a and 14b, and may use a water tank as a water supply means.

  As shown in FIGS. 1A and 1B, the flow plate 14 has two rows of gas-liquid flow lower portions 22a and 22b through which contaminated air passes along with water. Both the gas-liquid flow lower portions 22a and 22b are composed of a plurality of openings 23a and 23b, respectively. The openings 23a and 23b have the same shape and size. In the present embodiment, the openings 23a and 23b have a rectangular shape, the long side is set to about 750 mm, and the short side is set to about 300 mm. If the short sides of the openings 23a and 23b are less than 300 mm, clogging is likely to occur due to the paint, but this embodiment does not have such a risk. Each opening 23a constituting the gas-liquid flow lower part 22a on the side close to the narrow flow path 17 is in a position substantially directly below one side surface 2a of the object 2 to be conveyed. It arrange | positions at equal intervals along D1. Similarly, each opening 23b constituting the gas-liquid flow lower part 22b on the side far from the narrow flow path 17 is in a position almost directly below the other side surface 2b of the article 2 in the conveying direction of the article 2 to be coated. It arrange | positions at equal intervals along D1. In addition, since the short sides (dimensions in the width direction) of the openings 23a and 23b are about 300 mm, each opening 23a and 23b is to be coated 2 even if the entire width of the article 2 is several hundred mm. The side surfaces 2a and 2b are substantially directly below. Each opening part 23a, 23b is arrange | positioned along the conveyance direction D1 of the to-be-coated object 2 in zigzag form.

  As shown in FIG. 1A, a guide plate 16 as a guide member is provided below the flow plate 14. The guide plate 16 is extended from the lower end part of each opening part 23b toward the lower left of FIG. The guide plate 16 forms a flow path from the openings 23 a and 23 b to the vicinity of one side wall 12 c in the exhaust chamber 12. Therefore, the guide plate 16 guides the contaminated air that has passed through the openings 23 a and 23 b and the water dropped from the openings 23 a and 23 b to the vicinity of the side wall 12 c of the exhaust chamber 12.

  Further, the front end of the guide plate 16 is disposed close to the vicinity of the lower end of the side wall 12 c of the exhaust chamber 12. Thereby, the narrow channel 17 is formed between the tip of the guide plate 16 and the side wall 12c. The narrow channel 17 is the narrowest channel among the channels from the openings 23 a and 23 b to the exhaust duct 13. Therefore, when passing through the narrow channel 17, the flow velocity of air and water is maximized and water is atomized. At this time, the paint mist contained in the polluted air is collected in gas-liquid contact with the water droplets. Then, most of the water droplets that have collected the paint mist are guided from the opening of the narrow channel 17 to the bottom surface 12 a of the exhaust chamber 12. A part of the water droplets including the paint mist is guided to the exhaust duct 13 side.

  The space below the flow plate 14 and the guide plate 16 in the exhaust chamber 12 is a gas-liquid separation zone 19. A plurality of gas-liquid separation plates 20 are provided at a position between the narrow flow path 17 and the exhaust duct 13 in the gas-liquid separation zone 19. Each gas-liquid separation plate 20 separates moisture (water containing paint mist) from the air that has passed through the narrow channel 17. The separated moisture falls to the bottom surface 12a of the exhaust chamber 12 and flows to the exhaust duct 13 side. Further, the exhaust duct 13 discharges air purified through the gas-liquid separation plates 20 to the outside of the exhaust chamber 12. A drainage channel 21 is installed at a position below the bottom surface 12 a of the exhaust chamber 12. In the drainage channel 21, water flowing through the bottom surface 12a is temporarily accumulated.

  Next, the operation of the painting booth 1 will be described.

  First, when the top coat is applied by spraying the paint from the coating machine, the oversprayed paint together with the air in the coating chamber 3 opens the opening of the flow plate 14 disposed in the exhaust chamber 12. It is guided to the guide plate 16 from 23a, 23b.

  In addition, a plurality of openings 23a are arranged at positions almost directly below the side surface 2a in the object to be coated 2, and a plurality of openings 23b are arranged at positions almost directly below the side surface 2b in the object to be coated 2. For this reason, the contaminated air flowing in the vicinity of the side surface 2a of the object 2 passes through each opening 23a, and the contaminated air flowing in the vicinity of the side surface 2b of the object 2 passes through each opening 23b. Further, the openings 23a and 23b are arranged in substantially the same number as each other, and have the same shape and size. Therefore, the difference between the flow rate of contaminated air passing through each opening 23a and the flow rate of contaminated air passing through each opening 23b is reduced, and the occurrence of drift in the coating booth 1 is suppressed. Note that pressure loss also occurs when passing through the gas-liquid flow lower portions 22 a and 22 b, but the pressure loss at these portions is set to be smaller than the pressure loss generated when passing through the narrow channel 17.

  Thereafter, the contaminated air guided by the guide plate 16 is blown out to the gas-liquid separation zone 19. At this time, in the narrow channel 17, the water dropped from the openings 23 a and 23 b is atomized, the water droplets and the contaminated air are brought into gas-liquid contact, and the paint mist contained in the contaminated air is collected. Most of the water droplets generated in the narrow channel 17 fall to the bottom surface 12 a of the exhaust chamber 12 and are guided to the drainage channel 21. Some of the water droplets generated in the narrow channel 17 are guided to the exhaust duct 13 side together with air, separated from the air by the gas-liquid separation plate 20, and then dropped to the bottom surface 12a of the exhaust chamber 12 to be drained. Guided to path 21.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) According to the coating booth 1 of the present embodiment, the openings 23a and 23b are disposed at positions substantially directly below both side surfaces 2a and 2b of the article 2 to be coated. Thereby, the difference in the flow rate of the wind on the left and right of the booth is reduced, and the occurrence of drift in the painting booth 1 is suppressed. As a result, a part with poor coating efficiency is less likely to be partially generated in the article to be coated 2, so that the quality of the coating can be improved.

  (2) In the present embodiment, the openings 23 a and 23 b are arranged at equal intervals (in other words, discontinuously) along the conveyance direction D <b> 1 of the workpiece 2, so that the central portion 15 of the flow plate 14 is arranged. Water for rinsing can also be supplied to the upper surface. Moreover, the openings 23a and 23b are arranged in a staggered manner along the conveyance direction D1 of the article 2 to be coated. For this reason, the water flowing out from the water supply pipe 14a easily flows into the opening 23b through the upper surface of the central portion 15 in the direction of the arrow F1, and the water flowing out of the water supply pipe 14b flows through the upper surface of the central portion 15 into the opening 23b. It tends to flow in the direction of arrow F2 and reach the opening 23a (see FIG. 1B). Therefore, water for rinsing can be supplied to almost the entire upper surface of the flow plate 14. Therefore, it is possible to reliably prevent generation of an unwashed portion in the central portion 15 and more reliably wash away paint that has fallen on the upper surface of the flow plate 14. Accordingly, the painting booth 1 can be realized in which the flow plate 14 is hardly soiled and maintenance is easy.

  In addition, you may change embodiment of this invention as follows.

  -In above-mentioned embodiment, although gas-liquid flow lower part 22a, 22b was comprised by several opening part 23a, 23b, respectively, it is not limited to this. For example, as shown in FIGS. 2A and 2B, groove-like gas-liquid lower portions 24 a and 24 b extending along the conveying direction of the article 2 may be used.

  In this case, the central portion 15 of the flow plate 14 is inclined so as to rise from the left and right sides toward the booth center line, and a water supply pipe 14c having the same configuration as the water supply pipes 14a and 14b is provided in the vicinity of the booth center line. It is good. In this way, even if the water flowing out from the water supply pipes 14a and 14b does not reach the upper surface of the central part 15, the water flowing out from the water supply pipe 14c is supplied to the upper surface of the central part 15, so the flow plate 14 Water for rinsing can be supplied to almost the entire area of the upper surface.

  As shown in FIG. 3, a guide duct 25 (guide means) that guides contaminated air and water toward the center of the exhaust chamber 12 at the lower part of the gas-liquid flow lower part 22a on the side close to the narrow channel 17 It may be attached. In this way, the sound generated in the space formed by the side wall 12c, the flow plate 14 and the guide plate 16 (specifically, the sound generated by dropping water from the openings 23a and 23b, The sound generated when air and water pass through the narrow flow path 17 is less likely to leak to the coating chamber 3 side through the gas-liquid flow lower part 22a (opening part 23a), and noise can be reduced.

  In the above embodiment, the object to be coated 2 to which the paint is sprayed is an automobile body. However, the article to be coated 2 may be an automotive component such as an aerodynamic addition (such as a spoiler) or a bumper. In addition, the to-be-painted object 2 does not necessarily need to be an automotive part.

  In the above embodiment, the coating performed on the article 2 is a top coating. However, the coating performed on the article 2 may be undercoating or intermediate coating.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) In Claim 2, the plurality of openings have a rectangular shape with a short side of 300 mm or more.

  (2) In Claim 2, guide means for guiding contaminated air and liquid toward the central portion of the exhaust chamber at the lower part of the plurality of openings constituting the gas-liquid flow lower part on the side close to the narrow channel. Installed.

(A) is a schematic sectional drawing which shows the coating booth of one Embodiment which actualized this invention, (b) is a partial top view which shows the flow plate in it. (A) is a schematic sectional drawing which shows the coating booth of another embodiment, (b) is a partial top view which shows the flow plate in it. The schematic sectional drawing which shows the coating booth of another embodiment. The schematic sectional drawing which shows the painting booth of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Painting booth 2 ... To-be-coated object 2a, 2b ... Side 3 ... Painting chamber 12 ... Exhaust chamber 12c ... Side wall 14 ... Flow plate 14a, 14b as an overflow plate ... Water supply pipe 16 as water supply means ... As a guide member Guide plate 17 ... Narrow channels 22a, 22b, 24a, 24b ... Gas-liquid flow lower portions 23a, 23b ... Opening D1 ... Conveying direction

Claims (3)

  A coating chamber in which coating is performed on the object to be transported; and an exhaust chamber that is installed at a lower portion of the coating chamber and that processes contaminated air sucked from the coating chamber. Contaminated air and liquid flowing down through a gas-liquid lower portion formed in an overflow plate provided with an upper and lower overflow plate and provided with water supply means for supplying liquid to the upper surface side of the overflow plate. A guide member that guides the vicinity of one side wall of the exhaust chamber to the lower side of the overflow plate, and a painting booth in which a narrow channel is formed between the front end of the guide member and the side wall, A painting booth, wherein the gas-liquid lower portion is disposed along a conveying direction of the object to be coated at a position substantially directly below both side surfaces of the object to be coated.   The coating booth according to claim 1, wherein the lower part of the gas-liquid flow comprises a plurality of openings arranged at equal intervals along a conveying direction of the object to be coated.   The gas-liquid flow lower part is formed in two rows, and a plurality of openings constituting them are arranged in a staggered manner along the conveying direction of the object to be coated. painting booth.

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