JP2014036943A - Paint booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paint booth capable of restraining sticking of excess paint to a both sidewall of a painting chamber or the outflow of the excess paint to an external part of the painting chamber.SOLUTION: A paint booth 10 of the present invention is partitioned at an underfloor chamber 40 into a pair of side areas 45 and 45 including an underfloor intake port 43 and a center area 46 between the pair of side areas 45 and 45 in the width direction, by arranging the underfloor intake port 43 in two rows along a position near to a pair of booth sidewalls 11 and 11 among a flow plate 41, and arranging an underfloor partition wall 35 suspended from a drainboard plate 34 and separately positioned above the float plate 41 in two rows along the position near to the pair of booth sidewalls 11 and 11. A flow speed of air sucked in the pair of side areas 45 and 45 from the inside of the painting chamber 30, can be quickened more than a flow speed of air sucked in the center area 46, and a relatively high speed air current sucked in the underfloor chamber 40 is generated in a vicinal area of the pair of booth sidewalls 11 and 11.

Description

  The present invention relates to a painting booth provided with a painting chamber for performing a painting process.

  As a conventional painting booth of this type, between a pair of booth sidewalls that face each other in the horizontal direction, a ceiling board and a snowboard board that are opposed in the vertical direction are provided, and a pair of booth side walls and ceiling board are provided. It is known that a painting chamber surrounded on all sides by a snowboard plate is formed, a ceiling chamber is formed above the ceiling plate, and an underfloor chamber is formed below the snowboard plate. In this painting booth, air is sent to the ceiling room, while air in the underfloor room is exhausted to generate an airflow that descends from the entire ceiling panel to the painting room, and the dust in the painting room is removed by the airflow. (For example, refer to Patent Document 1).

JP 2006-159093 A (paragraph [0027], FIG. 1)

  However, in the above-described conventional painting booth, excessive paint that has not been applied to the object to be painted may deviate from the airflow in the painting chamber and adhere to the booth side wall, which requires a lot of labor for the cleaning work. . In addition, there is a problem that excess paint flows out of the painting booth and enters an adjacent process.

  The present invention has been made in view of the above circumstances, and provides a painting booth capable of suppressing the adhesion of surplus paint to the booth side wall of the painting room or the outflow of surplus paint to the outside of the painting room. Objective.

  In order to achieve the above object, a painting booth according to the invention of claim 1 is provided with an underfloor chamber provided between a snowboard plate of the painting booth and a flow plate opposed to the snooter plate from below, and the flow plate is underfloor. In the painting booth that has an air inlet and allows the air to flow down from the ceiling of the painting room above the slatboard, and to remove the dust in the painting room by exhausting the air in the underfloor room through the underfloor air inlet, The underfloor air intakes are arranged in two rows along a position near the booth side wall parallel to the direction of conveyance of the object to be painted in the painting room, and are located above the flow plate hanging down from the drainboard plate. The underfloor partition walls are arranged in two rows along the side of the booth side wall of the pair of slatboards, and the underfloor chambers are arranged in the width direction by the two rows of underfloor partition walls and include the underfloor air intakes. A pair of side regions, characterized in was divided into a center region therebetween a pair of side regions. In the present invention, the `` snowboard board '' is a floor board in the painting booth, and in the field of the painting booth, it is customarily called `` snowboard board '', but is generally called `` snowboard '', The structure is not limited to a structure in which a plurality of slits parallel to each other are formed in the plate material, and includes a mesh structure such as grating, punching metal, and expanded metal.

  The invention of claim 2 is characterized in that, in the painting booth according to claim 1, two rows of underfloor partition walls are arranged closer to the center in the width direction of the underfloor chamber than the two rows of underfloor air inlets.

  According to a third aspect of the present invention, in the painting booth according to the first or second aspect, a ceiling plate having a mesh structure is provided in the upper part of the painting chamber, and the compressed air is taken in above the ceiling plate to increase the internal pressure. A ceiling chamber for supplying air from the entire ceiling panel to the painting chamber, and a ceiling bulging portion formed by projecting upward the positions closer to the booth side walls of the pair of ceiling panels, Therefore, the air that has passed through the whole of the ceiling bulge is collected inside the ceiling bulge and is allowed to flow down into the painting chamber.

  According to a fourth aspect of the present invention, in the painting booth according to the third aspect, the ceiling plate hangs down from the position near the booth side wall in the pair to the painting chamber, faces the booth side wall, and passes through the ceiling bulge. It is characterized in that it is provided with a wind direction guide wall that allows the air supplied into the painting chamber to flow down along a pair of booth side walls.

  According to a fifth aspect of the present invention, in the painting booth according to the first to fourth aspects, the object to be painted is an automobile body, and a distance between a pair of booth side walls is 4.0 [m] or more. The distance between the booth side wall and the under floor partition wall is characterized by being 0.7 [m] or less.

  In order to achieve the above object, a painting booth according to the invention of claim 6 is provided with an underfloor room between a snowboard plate of the painting booth and a flow plate facing the snooker plate from below, and the flow plate is underfloor. In the painting booth that has an air inlet and allows the air to flow down from the ceiling of the painting room above the slatboard, and to remove the dust in the painting room by exhausting the air in the underfloor room through the underfloor air inlet, The underfloor air inlet is located near the both ends of the painting room in the direction of conveyance of the object to be painted, and the underfloor partition wall that is suspended above the lower surface of the underfloor chamber is suspended Arranged at positions close to both ends in the transport direction, the underfloor partition wall in the transport direction is located between the pair of transport end regions including the underfloor air inlet and the pair of transport end region by the underfloor partition walls. Characterized in was divided into a feed intermediate area.

  The invention of claim 7 is characterized in that, in the painting booth according to claim 6, the underfloor partition wall is disposed closer to the center in the transport direction of the underfloor chamber than the underfloor air inlet.

  According to an eighth aspect of the present invention, in the painting booth according to the sixth or seventh aspect, a ceiling plate having a mesh structure is provided at an upper portion of the painting chamber, and the compressed air is taken in above the ceiling plate to increase the internal pressure. And a ceiling chamber for supplying air from the entire ceiling panel to the painting chamber, and a ceiling bulging portion that protrudes upward from both ends of the ceiling plate in the conveying direction, and is provided by the internal pressure in the ceiling chamber. It is characterized in that the air that has passed through the entire ceiling bulge is collected inside the ceiling bulge and allowed to flow down into the painting chamber.

  The invention of claim 9 is the painting booth according to claim 8, wherein the ceiling board hangs down from the position near the both ends in the conveying direction into the painting chamber and is supplied to the painting chamber through the ceiling bulge. It is characterized in that it is provided with a wind direction guide wall that allows air to flow toward the underfloor air inlet.

[Invention of Claim 1]
According to the configuration of the first aspect, the underfloor air inlets are arranged in two rows along the position closer to the booth side wall of the pair of flow plates, and are suspended from the snowboard plate and separated above the flow plate. The located underfloor partition walls are arranged in two rows along the side of the pair of booth side walls, the underfloor chamber is in the width direction, a pair of side regions including the underfloor air inlet, It is divided into a center region between the side regions. As a result, the air flowing down in the coating chamber flows down so as to gather on the pair of booth side walls, that is, on the pair of side regions as it approaches the drainboard plate, and the flow velocity of air sucked into the pair of side regions Can be made faster than the flow rate of air sucked into the center region. That is, it is possible to generate a relatively high-speed airflow sucked into the underfloor room in the vicinity of the pair of booth side walls in the painting room, and it is possible to suppress the adhesion of surplus paint to the booth side wall than before. Become.

[Invention of claim 2]
According to the invention of claim 2, since the entire underfloor air intake is included in the side area of the underfloor chamber, the side area is compared with the case where only a part of the underfloor air intake is included in the side area. The flow velocity of the sucked air can be increased, and it is possible to further suppress the adhesion of surplus paint to the pair of booth side walls.

[Invention of claim 3]
According to invention of Claim 3, the air which passed through the whole ceiling bulging part by the internal pressure in a ceiling chamber is collected inside the ceiling bulging part, and flows down into the coating chamber. As a result, the amount of air passing per unit area of the horizontal cross section at the upper end of the coating chamber is greater at both end portions near the booth side wall than at the center portion in the width direction, and from both end portions in the width direction. It is possible to increase the flow velocity of the air flowing down toward the painting chamber. That is, since the flow velocity of the air flowing down into the coating chamber from the portion facing the pair of side regions from above can be increased, the entire pair of booth sidewalls can be covered with a relatively high speed air flow (air curtain). This makes it possible to reliably prevent the excessive paint from adhering to the booth side wall.

[Invention of claim 4]
According to the invention of claim 4, the relatively high-speed air supplied into the painting chamber through the ceiling bulge flows down along the pair of booth sidewalls (toward the pair of side regions). Therefore, it is possible to stabilize a relatively high-speed air flow covering the entire pair of booth side walls, and to more reliably prevent excess paint from adhering to the booth side walls. .

[Invention of claim 5]
The width dimension of the automobile body as the object to be painted differs depending on the vehicle type, and usually, the painting processing of these types of automobile bodies is performed in the same painting booth. The width dimension of a general automobile body is 1.5 to 2.0 [m], and the distance between a pair of booth side walls necessary for painting the plurality of kinds of automobile bodies is 4.0 [ m] or more. Moreover, the coating distance between the tip of the coating machine that sprays the paint and the automobile body is generally set to 0.3 [m] or less. Therefore, as in the invention of claim 5, the distance between the booth side wall and the underfloor partition wall is determined from the distance between the booth side wall and the automobile body having the maximum width (2.0 [m]) by the coating distance. By setting it to 0.7 [m] or less after subtracting the upper limit value, the paint sprayed from the coating machine is caused to flow by a relatively high speed air drawn into the side area of the underfloor room before reaching the automobile body. The situation can be prevented. Thereby, the coating nonuniformity accompanying the collapse of a spray pattern and the waste of a coating material can be prevented.

[Invention of claim 6]
According to the configuration of the sixth aspect, the underfloor intake port is disposed near the both ends of the flow plate in the conveyance direction of the flow plate, and the underfloor is hung from the drainboard plate and separated above the flow plate. The partition walls are arranged at positions near both ends in the transport direction, the underfloor chamber is in the transport direction, and a pair of transport end regions including the underfloor air inlets, and transport between the pair of transport end region It is divided into an intermediate area. As a result, the air that flows down in the coating chamber flows down so as to gather at both ends in the transport direction, that is, at the pair of transport end regions as it approaches the drainboard plate, and is sucked into the pair of transport end regions. Can be made faster than the flow velocity of the air sucked into the intermediate conveyance area. That is, a relatively high-speed air flow sucked into the underfloor room can be generated in the vicinity of both ends in the transport direction in the painting room, and the outflow of excess paint to the outside (adjacent process) of the painting room can be suppressed. Is possible.

[Invention of Claim 7]
According to the seventh aspect of the present invention, since the entire underfloor intake port disposed near both ends in the transport direction is included in the painted end region, only a part of the underfloor intake port is included in the painted end region. Compared with the case where it is included, it is possible to increase the flow velocity of the air sucked into the paint end region, and it is possible to further suppress the outflow of excess paint to the outside of the paint chamber.

[Invention of Claim 8]
According to invention of Claim 8, the air which passed through the whole ceiling bulging part by the internal pressure in a ceiling chamber is collected inside the ceiling bulging part, and flows down into the coating chamber. As a result, the amount of air passing per unit area of the horizontal cross section at the upper end of the coating chamber is greater at the portions closer to both ends in the transport direction than at the center portion in the width direction, and from both end portions in the transport direction to the coating chamber. The flow velocity of air flowing down can be increased. That is, since the flow velocity of the air flowing down from the portion facing the pair of transfer end regions from above into the coating chamber can be increased, the entire ends in the transfer direction are covered with a relatively high speed air flow (air curtain). It is possible to reliably prevent the excess paint from flowing out of the coating chamber.

[Invention of claim 9]
According to the ninth aspect of the invention, it is possible to guide the relatively high-speed air supplied through the ceiling bulging portion and supplied into the painting chamber so as to flow down toward the pair of conveying end regions. It is possible to stabilize a relatively high-speed air flow covering both ends in the transport direction, and more reliably prevent the excess paint from flowing out of the coating chamber.

Front sectional view of the painting booth according to the first embodiment of the present invention Front sectional view of the vicinity of the booth side wall Front sectional view of the painting booth according to the second embodiment

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the painting booth 10 has a ceiling chamber in order from the top in a booth building in which the upper ends of a pair of booth side walls 11, 11 opposed in the horizontal direction are connected by a booth roof wall 12. 20, a hierarchical structure including a painting chamber 30, an underfloor chamber 40, and a suction chamber 50. Air supplied to the ceiling chamber 20 from the outside passes through the painting chamber 30 and the underfloor chamber 40, and the suction chamber 50. It is configured to be sucked into. Hereinafter, the horizontal direction in which the pair of booth side walls 11 and 11 face each other is referred to as a “booth width direction”.

  Both ends of the painting chamber 30 in the horizontal direction perpendicular to the booth width direction (direction perpendicular to the paper surface of FIG. 1) serve as a carry-in port and a carry-out port of the painting object 90 (the automobile body in this embodiment). Yes. In the painting chamber 30, a floor conveyor 31 and a painting robot 32 are provided, and the object to be painted 90 is conveyed from the carry-in port to the carry-out port (for example, from the back side to the near side in FIG. 1) by the floor conveyor 31. Is done. In the conveying process, the paint is sprayed from the painting machine 33 provided in the painting robot 32 and the painting object 90 is coated. Hereinafter, the horizontal direction orthogonal to the booth width direction is referred to as “work transfer direction”.

  As shown in FIG. 1, the ceiling panel 21 is partitioned between the painting chamber 30 and the ceiling chamber 20 immediately above it. The ceiling panel 21 is passed between the pair of booth side walls 11 and 11 and faces the booth rooftop wall 12 from below. The ceiling panel 21 has a structure in which the upper surface of a mesh-like filter support plate 29 (for example, grating, punching metal, expanded metal, etc.) is covered with a filter mat 28 corresponding to the “ceiling plate” of the present invention. Air can pass through the entire panel 21.

  The ceiling room 20 is surrounded on all sides by a ceiling panel 21 and a booth roof wall 12 facing each other in the vertical direction, and a pair of booth side walls 11 and 11. The ceiling chamber 20 is divided into an upper region 22 and a lower region 23 below it by an intermediate wall 26. The intermediate wall 26 has a plurality of through holes formed therethrough, and the upper region 22 and the lower region 23 communicate with each other. The internal pressure of the lower region 23 is increased by the air pumped into the upper region 22 from the duct 27 extending to the side of the ceiling chamber 20, and the air is supplied into the painting chamber 30 from the entire ceiling panel 21.

  A space between the painting chamber 30 and the underfloor chamber 40 immediately below it is defined by a slatboard plate 34. The slat board 34 is passed between the pair of booth side walls 11 and 11 and faces the ceiling panel 21 from below. The slatboard plate 34 is generally composed of a plate material called a “snowboard” formed by forming a plurality of parallel slits, or a plate material having a mesh structure such as punching metal, expanded metal, and grating. The air can pass through the entire board 34.

  The painting chamber 30 is surrounded on all sides by a ceiling panel 21 and a slatboard plate 34 facing each other in the vertical direction and a pair of booth side walls 11 and 11. In the painting chamber 30, a floor conveyor 31 is disposed on the upper surface of the snowboard plate 34. The floor conveyor 31 extends in the work conveyance direction at the center in the booth width direction, and coating robots 32 are arranged on both sides of the floor conveyor 31 in the booth width direction.

  A space between the underfloor chamber 40 and the suction chamber 50 immediately below it is partitioned by a flow plate 41. The flow plate 41 is passed between the pair of booth side walls 11 and 11 and faces the drainboard plate 34 from below. The underfloor chamber 40 is surrounded on all sides by a slatboard plate 34 and a flow plate 41 which face each other in the vertical direction, and a pair of booth side walls 11 and 11.

  A venturi portion 42 is attached to the flow plate 41. The venturi section 42 includes an underfloor air inlet 43 that is open on the upper surface of the flow plate 41 and a blower outlet 44 that is opened horizontally in the suction chamber 50 below the flow plate 41, via the venturi section 42. The underfloor chamber 40 and the suction chamber 50 communicate with each other. The structure of the venturi portion 42 is not particularly limited.

  The upper surface of the flow plate 41 is gently inclined downward toward the underfloor intake port 43 so that the collected liquid flowing in a film shape on the upper surface of the flow plate 41 flows down to the suction chamber 50 through the venturi portion 42. It has become.

  The air in the suction chamber 50 is forcibly exhausted by an exhaust fan (not shown), and the air supplied from the entire ceiling panel 21 into the painting chamber 30 passes through the slatboard plate 34, the underfloor chamber 40 and the venturi section 42. It is sucked into the suction chamber 50. As a result, an airflow descending from the entire ceiling panel 21 to the slatted board 34 is generated in the painting chamber 30. Air sucked into the suction chamber 50 is exhausted from the exhaust duct 51 to the outside of the painting booth 10.

  The dust floating in the painting chamber 30, specifically, the surplus paint that has not been applied to the painting object 90, is caused to flow into the airflow descending in the painting chamber 30, so that the underfloor chamber 40 below the drainboard plate 34. Furthermore, it flows into the suction chamber 50 through the venturi 42 together with the collected liquid.

  Of the excess paint removed from the painting chamber 30 to the underfloor chamber 40, relatively large particles fall down to the collecting liquid flowing on the flow plate 41 and are collected. Further, the speed is increased when the air passes through the venturi section 42, and the collected liquid is atomized at the outlet 44 of the venturi section 42 by the increased speed of air. Of the excess paint removed from the painting chamber 30 to the underfloor chamber 40, fine particles are collected by droplets atomized at the outlet 44.

  Now, the painting booth 10 of this embodiment has the following configuration in order to prevent surplus paint from adhering to the booth side walls 11 of the painting chamber 30.

  The underfloor air inlets 43 of the venturi section 42 formed in the flow plate 41 are arranged in two rows along the positions closer to both ends in the booth width direction. The underfloor intake port 43 has, for example, a rectangular shape in which the workpiece transfer direction is longer than the booth width direction. In addition, a plurality of underfloor inlets 43 arranged in a line along one booth side wall 11 in the flow plate 41, and a plurality of underfloor inlets 43 arranged in a line along the other booth side wall 11, Are arranged out of phase with each other in the workpiece transfer direction.

  The underfloor chamber 40 is provided with an underfloor partition wall 35 that divides the underfloor chamber 40 into three regions 45, 45, and 46 in the booth width direction. The underfloor partition wall 35 is suspended from the drainboard plate 34 and is located above the flow plate 41, and is arranged in two rows along the pair of booth side walls 11, 11 on the drainboard plate 34. ing.

  The underfloor partition walls 35 arranged in two rows are arranged closer to the center in the width direction of the underfloor chamber 40 than the underfloor air inlets 43 formed in the flow plate 41 in two rows. By the underfloor partition walls 35, 35 arranged in these two rows, the underfloor chamber 40 in the booth width direction is a pair of relatively narrow side regions 45, 45 including the entire underfloor air inlet 43, and the 1 It is partitioned into a relatively wide center region 46 between the pair of side regions 45, 45.

  This makes it possible to increase the flow rate of air sucked into the pair of side regions 45, 45 out of the air descending the coating chamber 30, compared to the flow rate of air sucked into the center region 46. In other words, the air suction force in the pair of side regions 45, 45 can be made larger than the air suction force in the center region 46.

  In the lower region 23 of the ceiling chamber 20, a pair of booth side walls 11, 11 is provided with hook-like mesh convex portions 24 extending between both end portions in the workpiece transfer direction. The mesh convex portion 24 is attached to the upper surface of the filter support plate 29 and protrudes into the ceiling chamber 20. Specifically, the mesh convex portion 24 has a pair of mesh inclined walls 24B and 24B that are inclined so as to be separated from each other toward the lower side (filter support plate 29) from the top 24A extending in parallel with the workpiece conveyance direction. A plurality of (for example, two) pieces are arranged in parallel at positions closer to the booth side walls 11 and 11, respectively. Both ends of the mesh convex portion 24 in the workpiece conveying direction are closed by triangular blocking walls (not shown).

  The mesh convex portion 24 is covered with the filter mat 28 that covers the upper surface of the filter support plate 29. The filter mat 28 includes a flat covering portion 28A that covers the upper surface of the filter support plate 29 other than the portion where the mesh convex portions 24 are provided, and a pair of booth sidewalls 11 and 11 that are close to the booth side walls 11 and 11 of the flat covering portion 28A. It has a bulging covering portion 28B (corresponding to the “ceiling bulging portion” of the present invention) that bulges toward the chamber 20 and covers the mesh convex portions 24 (mesh inclined walls 24B, 24B). The bulging covering portion 28B has a hook shape extending in parallel with the workpiece conveyance direction corresponding to the shape of the mesh convex portion 24, and a vertical section perpendicular to the workpiece conveyance direction has a mountain shape. Further, a plurality of (for example, two) bulge covering portions 28B are arranged in parallel at positions close to the pair of booth side walls 11 and 11, respectively.

  The air that has passed through the entire bulging cover portion 28B due to the internal pressure of the ceiling chamber 20 is collected inside the bulging covering portion 28B and flows down into the painting chamber 30. As a result, the amount of air passing per unit area of the horizontal section at the upper end of the coating chamber 30 is larger at both end portions near the pair of booth side walls 11 and 11 than in the central portion in the booth width direction, and the ceiling chamber. The flow velocity of the air flowing down into the coating chamber 30 from both end portions in the booth width direction of 20 can be increased. In other words, relatively high-speed air is allowed to flow from the portion of the ceiling chamber 20 facing the pair of side regions 45, 45 from above, while the coating object 90 of the ceiling chamber 20 is opposed from above. From this portion, relatively low speed air can flow down so as not to destroy the spray pattern of the coating machine 33. In addition, the mesh convex part 24 can be attached or detached with respect to the filter support plate 29, and can be changed into arbitrary numbers.

  As shown in FIG. 1, a pair of wind direction guide walls 25 are provided at positions closer to the pair of booth side walls 11, 11 (both ends in the booth width direction) in the ceiling panel 21. The wind direction guide wall 25 hangs down into the painting chamber 30 from a position closer to the center in the booth width direction than the bulging covering portions 28B and 28B in the ceiling panel 21, and faces the booth side wall 11 in the booth width direction. Yes. The wind direction guide wall 25 causes the relatively high-speed air supplied into the coating chamber 30 through the bulging covering portion 28 </ b> B to flow down vertically along the booth side walls 11, 11.

  Here, before the paint sprayed from the coating machine 33 reaches the automobile body that is the object to be coated 90, if it is caused to flow into a relatively high-speed airflow sucked into the pair of side regions 45, 45, The spray pattern collapses, causing uneven coating and waste of paint. In order to avoid such a situation, in this embodiment, the underfloor partition wall 35 is arranged as follows. In other words, the width dimension of the automobile body as the object to be coated 90 varies depending on the vehicle type, and usually, the painting process of these plural kinds of automobile bodies is performed in the same painting booth 10. The width dimension of a general automobile body is 1.5 to 2.0 [m], and a pair of booth side walls 11, 11 necessary for painting these plural kinds of automobile bodies in the same painting booth 10. The distance between is 4.0 [m] or more. Further, the coating distance d2 between the tip of the coating machine 33 and the automobile body that is the object to be coated 90 is generally set to 0.3 [m] or less. Therefore, the distance D1 between the booth side wall 11 and the underfloor partition wall 35 is set to the maximum value of the coating distance d2 from the distance d1 between the booth side wall 11 and the automobile body having the maximum width (2.0 [m]). By setting the value to 0.7 [m] or less by subtracting a certain 0.3 [m], it becomes possible to prevent the spray pattern from collapsing due to the air flow sucked into the pair of side regions 45 and 45.

  Furthermore, in this embodiment, in order to further increase the flow velocity of the air sucked into the pair of side regions 45, 45 (in other words, to increase the suction force of the pair of side regions 45, 45), 35 and the underfloor air intake 43 are configured as follows. That is, the vertical distance h1 between the drainboard plate 34 and the flow plate 41 in the portion where the underfloor partition wall 35 is formed is 0.5 to 1.0 [m], whereas the lower end portion of the underfloor partition wall 35 and the flow. The separation distance H1 from the upper surface of the plate 41 is 0.25 to 0.5 [m] which is 1/2 or less of the vertical distance h1 (see FIG. 2).

  In addition, the underfloor air intake 43 is always at a position biased toward the booth side wall 11 side rather than an intermediate position between the car body and the booth side wall 11 regardless of the width dimension of the car body to be painted in the painting booth 10. Is arranged. Specifically, it is more than an intermediate position between the automobile body having the maximum width (2.0 [m]) to be painted at the painting booth 10 and the booth side wall 11 (a position away from the booth side wall 11 by d1 / 2 [m]). The booth side wall 11 is biased.

  Further, the innermost opening edge 43 </ b> A farthest from the booth side wall 11 in the underfloor air inlet 43 and the underfloor partition wall 35 are arranged close to each other. Specifically, the difference obtained by subtracting the distance d3 between the booth side wall 11 and the innermost opening edge 43A of the underfloor intake port 43 from the distance D1 between the booth side wall 11 and the underfloor partition wall 35 is the booth. The underfloor partition wall 35 and the underfloor intake port 43 are arranged so as to be ½ or less of the opening width W of the underfloor intake port 43 in the width direction. In the present embodiment, the distance D1 between the booth side wall 11 and the underfloor partition wall 35 and the distance D2 between the booth side wall 11 and the wind direction guide wall 25 are the same.

  The configuration of the present embodiment has been described above. Next, the effect of the painting booth 10 of this embodiment is demonstrated. The painting object 90 is carried into the painting chamber 30 from the carry-in entrance while being held by the floor conveyor 31, and moves in the painting chamber 30 toward the carry-out port. In the middle of the movement, paint is sprayed from the coating machine 33 and the coating process is performed.

  At this time, surplus paint that has not been applied to the object to be coated 90 is caused to flow by the air that descends toward the drainboard plate 34 in the coating chamber 30. That is, the surplus paint passes through the slat board 34 together with air, is sucked into the venturi section 42, and is collected in the collection liquid.

  Here, an underfloor inlet wall 43 formed in the flow plate 41 and an underfloor partition wall 35 suspended from the slatboard plate 34 are arranged in two rows along the position close to the pair of booth side walls 11, 11. Since the chamber 40 is partitioned into a pair of side regions 45, 45 including all of the underfloor air inlets 43 in the booth width direction, and a center region 46 between the side regions 45, 45, the ceiling panel 21 The air that blows out from the entire chamber and flows down in the painting chamber 30 flows down so as to gather on the booth side wall 11 side (above the side regions 45 and 45) as it goes downward, and is sucked into the pair of side regions 45 and 45. The flow rate of air to be drawn can be made higher than the flow rate of air sucked into the center region 46.

  In addition, since the bulging covering portion 28B is provided near the pair of booth side walls 11 and 11 in the ceiling chamber 20, the ceiling panel 21 is painted from a portion facing the pair of side regions 45 and 45 from above. The flow rate of the air supplied to the chamber 30 can be increased as compared with the flow rate of the air blown out from the center portion in the booth width direction (portion directly above the coating object 90). Further, since the bulging cover portion 28B is disposed at a position closer to the booth side wall 11 than the wind direction guide wall 25 hanging from the ceiling panel 21, a pair of relatively fast air that has passed through the bulging covering portion 28B is allowed to flow. It can flow down along the booth side walls 11 and 11 (toward a pair of side regions 45 and 45).

  Thus, according to the present embodiment, the underfloor partition wall 35 and the underfloor air inlet 43 are provided near the pair of booth side walls 11, 11 in the underfloor chamber 40, and are painted at a higher speed than the center region 46. A pair of side regions 45 and 45 for sucking the air in the chamber 30 are formed, and the bulging covering portion 28B and the wind direction guide wall 25 are formed at positions closer to the booth side walls 11 and 11 in the ceiling chamber 20. A relatively high-speed air is provided and can flow down along the pair of booth side walls 11, 11. Therefore, a relatively high-speed air flow covering the entire pair of booth side walls 11, 11 in the painting chamber 30. (Air curtain) can be generated, and adhesion of surplus paint to the booth side walls 11 can be reliably prevented. Thereby, the cleaning work and cleaning cost of the booth side walls 11 and 11 can be reduced more than before.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The painting booth 10 of the present embodiment constitutes a series of painting processing lines together with a pretreatment booth 81 and a posttreatment booth (not shown) that are adjacent in the workpiece conveyance direction.

  In the coating chamber 30, both ends in the workpiece transfer direction are loaded with inlets 35 for loading a coating object 90 (automobile body in this embodiment) from a pretreatment booth 81, and a posttreatment booth (not shown). ) And an unloading port 36 for unloading the object 90 to be coated. That is, the coating chamber 30 has a structure that is always opened to the outside by the carry-in entrance 35 and the carry-out exit 36 (communication with the pretreatment booth 81 and the posttreatment booth).

  A coating machine 33 is disposed in the painting chamber 30 at an intermediate position in the workpiece conveyance direction. The painting machine 33 is disposed above the workpiece passage region through which the painting object 90 passes, and sprays the coating material from above the painting object 90.

  The underfloor air inlets 43 of the venturi section 42 formed in the flow plate 41 are distributed over the entire flow plate 41 including both ends in the workpiece transfer direction.

  The underfloor chamber 40 is provided with an underfloor partition wall 35 that divides the underfloor chamber 40 into three regions 47, 47, and 48 in the workpiece transfer direction. The underfloor partition wall 35 hangs down from the slatboard plate 34 and is positioned above the flow plate 41, and is disposed at positions near both ends of the slatboard plate 34 in the workpiece conveyance direction.

  The underfloor partition wall 35 is disposed closer to the center of the underfloor chamber 40 in the workpiece conveyance direction than a pair of underfloor intake ports 43 formed at both ends in the workpiece conveyance direction. By the pair of underfloor partition walls 35, 35, a space between the pair of transfer end regions 47, 47 and the pair of transfer end regions 47, 47 where the underfloor chamber 40 is relatively narrow in the workpiece transfer direction. And a relatively wide conveyance intermediate region 48.

  This makes it possible to increase the flow rate of air sucked into the pair of transfer end regions 47 and 47 out of the air descending the coating chamber 30 higher than the flow rate of air sucked into the transfer intermediate region 48. . In other words, the air suction force in the pair of transport end regions 47 and 47 can be made larger than the air suction force in the transport intermediate region 48.

  In the ceiling chamber 20, hook-shaped mesh convex portions 24 extending between both ends in the booth width direction are provided at both ends in the workpiece transfer direction. The mesh convex part 24 is covered with a filter mat 28. The filter mat 28 includes a flat covering portion 28A and a bulging covering portion 28B that bulges from both ends of the flat covering portion 28A in the workpiece conveyance direction and covers the mesh convex portion 24. The swollen covering portion 28B has a hook shape extending in the booth width direction corresponding to the shape of the mesh convex portion 24, and a vertical cross section perpendicular to the booth width direction has a mountain shape.

  As a result, relatively high-speed air flows from the portion of the ceiling chamber 20 facing the pair of transfer end regions 47 and 47 from above, while the coating target workpiece W in the ceiling chamber 20 flows. From a portion facing from above, relatively low speed air flows down so that the spray pattern of the coating machine 33 does not collapse.

  As shown in FIG. 3, a pair of wind direction guide walls 25 are provided at positions closer to both ends of the ceiling panel 21 in the workpiece conveyance direction. The wind direction guide wall 25 hangs down from the position of the ceiling panel 21 closer to the center in the workpiece transfer direction than the bulging covering portions 28B and 28B into the coating chamber 30. The wind direction guide wall 25 causes the relatively high-speed air that has passed through the bulging covering portion 28 </ b> B and is supplied into the coating chamber 30 to flow toward the conveyance end regions 47 and 47.

  According to the present embodiment, the underfloor partition wall 35 and the underfloor intake port 43 are provided in positions near both ends in the workpiece conveyance direction in the underfloor chamber 40, and the air in the coating chamber 30 is drawn at a higher speed than the conveyance intermediate region 48. A pair of conveying end regions 47 and 47 for suction are formed, and a bulging covering portion 28B and a wind direction guide wall 25 are provided at positions near both ends in the pair of workpiece conveying directions in the ceiling chamber 20, Since relatively high-speed air can flow down toward the conveyance end regions 47 and 47, a relatively high-speed air flow (air curtain) covering the entire carry-in port 35 and carry-out port 36 in the coating chamber 30 is generated. It is possible to prevent the excess paint from flowing out of the coating chamber 30 (adjacent pretreatment booth 81 and posttreatment booth).

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first and second embodiments, the airflow direction guide wall 25 and the bulge covering portion 28B corresponding to the “ceiling bulge portion” of the present invention are provided. It is good also as a structure which is provided with only the bulging coating | coated part 28B and is not provided with the wind direction guide wall 25. FIG. Even in such a configuration, a relatively high-speed airflow (relatively large) sucked into the underfloor chamber 40 in the region near the pair of booth side walls 11, 11 in the coating chamber 30 or the region near both ends in the workpiece transfer direction. (Suction force) can be generated, so that it is possible to suppress the adhesion of the surplus paint to the booth side walls 11 and 11 or the outflow of the surplus paint from the coating chamber 30 as compared with the prior art.

  (2) In the first embodiment, the underfloor partition wall 35 is arranged such that the entire underfloor intake ports 43 and 43 disposed near the pair of booth side walls 11 and 11 are included in the side regions 45 and 45, respectively. , 35 are arranged on the center side in the booth width direction from the innermost opening edge 43A of the underfloor intake port 43, but only a part of the underfloor intake ports 43, 43 are included in the side regions 45, 45, respectively. As described above, the underfloor partition wall 35 may be disposed directly above the underfloor air inlet 43. However, the flow rate of the air sucked into the side regions 45 and 45 can be increased by disposing the underfloor partition wall 35 closer to the center in the width direction of the underfloor chamber 40 than the underfloor intake port 43 as in the above embodiment. Is more preferable.

  Similarly, in the second embodiment, the underfloor partition wall 35, so that the entire underfloor inlets 43, 43 arranged at positions near both ends in the workpiece transfer direction are included in the transfer end regions 47, 47, respectively. 35 is disposed on the center side in the workpiece transfer direction from the innermost opening edge 43A of the underfloor intake port 43, but only a part of the underfloor intake ports 43 and 43 are provided in the transfer end regions 47 and 47, respectively. The underfloor partition wall 35 may be disposed directly above the underfloor air inlet 43 so as to be included.

  (3) In the first and second embodiments, the mesh convex portion 24 is configured as a separate part from the filter support plate 29, but the portion closer to the pair of booth side walls 11, 11 in the filter support plate 29. Alternatively, the mesh convex portions 24 may be integrally formed with the filter support plate 29 by causing the portions near both ends in the workpiece conveyance direction to bulge toward the ceiling chamber 20 side. In addition, the mesh convex portion 24 and the bulging covering portion 28B that covers the upper surface of the mesh convex portion 24 have a mountain shape in cross section, but may have other shapes as long as the shape protrudes toward the ceiling chamber 20 side. For example, a rectangular cross section, a trapezoidal cross section, an inverted U-shaped cross section, or a Ω cross section may be used.

  (4) In the first embodiment, the bulging covering portion 28B is provided in the ceiling chamber 20 near the both ends (booth side walls 11 and 11) in the booth width direction, but the bulging covering portion 28B is provided. Instead, the ceiling room 20 (lower region 23) is partitioned into a pair of side regions near the booth side walls 11 and 11 and a central region between the pair of side regions in the booth width direction, An air supply fan that supplies air toward the painting chamber 30 may be provided in the pair of side regions.

  (5) Also, by adjusting the amount of air supplied to the pair of side regions and the central region, the flow rate of the air supplied from the portions closer to the booth side walls 11 and 11 to the coating chamber 30 is changed in the booth width direction. It may be higher than the flow rate of air supplied from the central portion.

  (6) In the second embodiment, the bulging cover portion 28B is provided in the ceiling chamber 20 at positions near both ends in the workpiece transfer direction. Instead of providing the bulging cover portion 28B, the ceiling chamber 20 is Supplying air to the coating chamber 30 by dividing into a pair of side regions near both ends in the workpiece transfer direction and a central region between the pair of side regions. An air fan may be provided.

  (7) Further, by adjusting the amount of air supplied to the pair of side regions and the central region, the flow rate of the air supplied from the both end portions in the workpiece conveyance direction to the coating chamber 30 is changed to the center in the workpiece conveyance direction. It may be higher than the flow rate of the air supplied from the part.

  (8) In the first embodiment, the interval between the booth side wall 11 and the wind direction guide wall 25 and the interval between the booth side wall 11 and the underfloor partition wall 35 are the same. However, these intervals are made different from each other. May be.

  (9) In the first embodiment, the bulging covering portion 28B is arranged in a bowl shape extending between both ends in the workpiece conveyance direction in the ceiling chamber 20, but the bulging covering portion 28B is For example, a relatively short bowl extending in the booth width direction in the vicinity of the booth side walls 11 and 11 in the ceiling chamber 20 may be arranged in a plurality in the workpiece transfer direction.

  (10) In the second embodiment, the bulging cover portion 28B is arranged in a bowl shape extending between both ends in the booth width direction in the ceiling chamber 20, but the bulging covering portion 28B is For example, a relatively short bowl shape extending in the workpiece conveyance direction in the region near both ends in the workpiece conveyance direction in the ceiling chamber 20 may be arranged in a plurality in the booth width direction.

  (11) In the above embodiment, the flow plate 41 is provided with the venturi portion 42, and when the air passes through the venturi portion 42, the excess paint is collected in the collection liquid. 41 is not provided with the venturi section 42, but only the underfloor intake port 43 that connects the underfloor chamber 40 and the suction chamber 50 is provided, and the air flowing into the suction chamber 50 from the underfloor intake port 43 is allowed to flow into the suction chamber 50 or A configuration may be adopted in which particles of surplus paint are separated and removed from the air by introducing into a gas-liquid contact type or baffle type scrubber separately provided on the side of the painting booth 10.

  (12) In the above embodiment, the collected liquid is allowed to flow on the upper surface of the flow plate 41. For example, the entire flow plate is covered with a gel, and excess paint that has fallen on the flow plate with the oil or moisture of the gel. A configuration may be adopted in which, while preventing sticking, excess paint accumulated on the gel is scraped off by a scraper moving relative to the flow plate and removed together with a part of the gel.

DESCRIPTION OF SYMBOLS 10 Painting booth 11 Booth side wall 12 Booth upper end wall 20 Ceiling room 21 Ceiling panel 25 Wind direction guide wall 28 Filter mat (ceiling board)
28B bulge cover (ceiling bulge)
DESCRIPTION OF SYMBOLS 30 Coating chamber 34 Slatboard 35 Underfloor partition wall 40 Underfloor chamber 41 Flow plate 43 Underfloor inlet 45 Side area 46 Center area 47 Conveyance edge area 48 Conveyance intermediate area 90

Claims (9)

An underfloor chamber is provided between the snowboard plate of the painting booth and the flow plate facing the snorkel plate from below, and the flow plate is provided with an underfloor air inlet, and air is supplied from the ceiling of the paint chamber above the snowboard plate. In the painting booth that allows the dust in the painting room to be removed by flowing down and exhausting the air in the underfloor room through the underfloor air inlet,
The underfloor air inlets are arranged in two rows along a position near a pair of booth side walls parallel to the conveying direction of the object to be painted in the painting chamber, and are suspended from the drainboard plate and above the flow plate. The floor partition walls located apart from each other are arranged in two rows along the position close to the pair of booth side walls of the slatboard,
By the two rows of underfloor partition walls, the underfloor chamber is partitioned in the width direction into a pair of side regions including the underfloor air inlet and a center region between the pair of side regions. Paint booth to do.   The painting booth according to claim 1, wherein the two rows of underfloor partition walls are arranged closer to the center in the width direction of the underfloor chamber than the two rows of underfloor air intakes. A ceiling chamber provided with a mesh structure ceiling plate in the upper part of the painting chamber, and the compressed air is taken in above the ceiling plate to increase the internal pressure and supply air from the entire ceiling plate to the painting chamber And forming
A ceiling bulging portion formed by projecting the pair of booth side wall positions on the ceiling plate upward respectively;
3. The air according to claim 1, wherein air that has passed through the entire ceiling bulging portion due to internal pressure in the ceiling chamber is collected inside the ceiling bulging portion to flow down into the coating chamber. painting booth.   From the position near the booth side wall of the pair of ceiling plates, facing the booth side wall from the position near the booth side wall, passing through the ceiling bulging portion, the air supplied into the painting chamber, The painting booth according to claim 3, further comprising a wind direction guide wall that flows down along a pair of booth side walls.   The object to be painted is a body of an automobile, a distance between the pair of booth side walls is 4.0 [m] or more, and a distance between the booth side wall and the underfloor partition wall is 0.00. The coating booth according to claim 1, wherein the coating booth is 7 [m] or less. An underfloor chamber is provided between the snowboard plate of the painting booth and the flow plate facing the snorkel plate from below, and the flow plate is provided with an underfloor air inlet, and air is supplied from the ceiling of the paint chamber above the snowboard plate. In the painting booth that allows the dust in the painting room to be removed by flowing down and exhausting the air in the underfloor room through the underfloor air inlet,
The underfloor inlet is disposed at a position near both ends of the painting chamber in the painting direction in the painting chamber, and an underfloor partition wall that is suspended from the snooter plate and located above the flow plate Arranged at the position near the both ends of the transport direction of the plate,
The underfloor chamber is partitioned by the underfloor partition wall in the transport direction into a pair of transport end regions including the underfloor air inlet and a transport intermediate region between the pair of transport end regions. A painting booth characterized by   The painting booth according to claim 6, wherein the underfloor partition wall is disposed closer to the center of the underfloor chamber in the transport direction than the underfloor air intake. A ceiling chamber provided with a mesh structure ceiling plate in the upper part of the painting chamber, and the compressed air is taken in above the ceiling plate to increase the internal pressure and supply air from the entire ceiling plate to the painting chamber And forming
A ceiling bulge portion that protrudes upward from each position near both ends in the conveying direction of the ceiling plate,
8. The air according to claim 6, wherein air that has passed through the entire ceiling bulging portion due to internal pressure in the ceiling chamber is collected inside the ceiling bulging portion and flows down into the painting chamber. painting booth.   The ceiling plate hangs down from the position near both ends in the transport direction into the coating chamber, and flows through the ceiling bulging portion and flows into the coating chamber toward the transport end region. The painting booth according to claim 8, further comprising a wind direction guide wall.

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