JP2018187542A - Coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating booth which can suppress overengineering of air supply.SOLUTION: In a coating booth 10, air is supplied to a coating chamber 20 from a blowout nozzle 50 arranged on a ceiling of the coating chamber 20. The blowout nozzle 50 includes a blowout port 51 formed on the ceiling of the coating chamber 20, and a cover 52 which covers the blowout port 51 from a coating chamber 20 side. The cover 52 includes an opposite wall 53 arranged opposite to the blowout port 51, and a rising wall 54 which rises from an outer edge part of the opposite wall 53 and is abutted on an opening edge of the blowout port 51. The opposite wall 53 and the rising wall 54 are structured of a punching metal or a slit plate, and an opening ratio of the punching metal or the slit plate which structures the opposite wall 53 is larger than an opening ratio of the punching metal or the slit plate which structures the rising wall 54.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a painting booth in which air is supplied to a painting chamber from a blowout nozzle provided on the ceiling of the painting chamber.

  The painting booth disclosed in Patent Document 1 forms a downflow of air that uniformly flows from an air supply chamber provided above the painting chamber to the painting chamber, captures the paint mist by the downflow, and Discharge into an exhaust chamber provided under the floor.

Japanese Patent Laying-Open No. 2006-67998 (paragraph [0029], FIG. 1)

  By the way, when the worker enters the painting chamber at the time of maintenance, it is necessary to maintain the average wind speed in the painting chamber at a reference value or higher in order to ensure the safety of the worker. For this reason, in the painting booth of patent document 1, the wind speed in a painting chamber is set more than a reference value also at the time of painting. However, in the painting booth of Patent Document 1, there is a problem that the supply air is over-spec because the density of the paint mist is low and the downflow is uniformly formed even in places where the need for downflow is low. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a painting booth that can suppress overspec of supply air.

  The invention of claim 1 is a painting booth in which air is supplied to the painting chamber from a blowing nozzle provided on the ceiling of the painting chamber, and the blowing nozzle includes a blowout port formed on the ceiling of the painting chamber. And a cover that covers the air outlet from the coating chamber side, the cover standing opposite to the air outlet, and an opening edge of the air outlet that stands up from the outer edge portion of the air outlet wall. The opposing wall and the standing wall are both made of a punching metal or a slit plate, and an opening ratio of the punching metal or the slit plate constituting the opposing wall is determined by the rising wall. The opening ratio of the punching metal or the slit plate is larger.

  According to a second aspect of the present invention, in the painting booth according to the first aspect, the blowout nozzle is disposed above a work conveyance path through which a work is conveyed in the painting chamber.

  According to a third aspect of the present invention, in the coating booth according to the second aspect, the blowing nozzles are arranged in pairs above both ends in the width direction of the work transfer path.

  In the present invention, the cover that covers the air outlet from the coating chamber side is composed of an opposing wall and an upright wall, and the aperture ratio of the punching metal or slit plate constituting the opposing wall is the aperture ratio of the punching metal or slit plate constituting the upright wall. Since it is larger, the wind speed of the air flowing through the opening of the opposing wall to the painting chamber becomes higher than the wind speed of the air flowing through the opening of the standing wall into the painting chamber. That is, in the present invention, the air velocity supplied to the coating chamber is varied. As a result, in the present invention, it is possible to increase the wind speed at a location where the need for air supply is high, and to reduce the wind speed at a location where the need for air supply is low, thereby suppressing overspecification of the air supply. It becomes.

  In a preferred configuration of the present invention, the blow-out nozzle is disposed above the workpiece conveyance path through which the workpiece is conveyed in the coating chamber (invention of claim 2). In this configuration, while increasing the wind speed around the work, it is possible to reduce the wind speed at a location where the density of the paint mist is lower than that around the work, thereby improving the air supply efficiency.

  In a more preferred configuration of the present invention, the blowout nozzles are arranged in pairs above both ends in the width direction of the work transfer path (invention of claim 3). In this configuration, the air speed can be lowered even in the region where the density of the paint mist is lowered above the workpiece, so that the air supply efficiency can be improved.

Front sectional view of a painting booth according to an embodiment of the present invention Side cross-sectional view of blowout nozzle The figure for explaining the flow of the air supplied to the painting room (A) Front sectional view of the air supply chamber when the filter is disposed at the first position, (B) Front sectional view of the air supply chamber when the filter is disposed at the second position Top view of the filter Painting booth block diagram

  As shown in FIG. 1, the painting booth 10 of the present embodiment constitutes a part of a painting processing line, and has a hierarchical structure including an air supply chamber 15, a painting chamber 20, and an exhaust chamber 30 in order from the top. Yes. Then, air supplied from an air supply duct (not shown) to the air supply chamber 15 passes through the painting chamber 20 and the exhaust chamber 30. The air in the exhaust chamber 30 is sucked by an exhaust duct (not shown).

  A floor conveyor 21 is provided in the painting chamber 20. The floor conveyor 21 includes a guide rail 21A extending in the work conveyance direction at the center in the booth width direction and a loading table 21B that moves while being guided by the guide rail 21A. In the painting booth 10, the workpiece W (the automobile body in the present embodiment) that is the subject of painting is conveyed continuously or intermittently while being supported from below by the loading platform 21B. And the area | region through which the workpiece | work W passes becomes the workpiece conveyance path WH. In addition, the length of the work conveyance direction in the painting booth 10 is longer than the length of the booth width direction. In FIG. 1, the depth direction on the paper is the workpiece conveyance direction, and the lateral direction is the booth width direction.

  A coating machine 22 is provided at both ends of the coating room 20 in the booth width direction. The coating machine 22 is composed of, for example, an articulated robot, and sprays paint onto the workpiece W from above or from the side.

  At least a part of the floor wall 20 </ b> B that partitions between the painting chamber 20 and the underfloor chamber 30 is configured by a snowboard plate 24. Then, the air containing the paint mist falls from the painting chamber 20 through the slatboard 24 to the underfloor chamber 30.

  A blowing nozzle 50 is provided on the ceiling wall 20 </ b> T that partitions between the air supply chamber 15 and the coating chamber 20, and a filter 25 is provided on the upper surface side of the blowing nozzle 50. Air is supplied to the air supply chamber 15 from a duct (not shown). The air supplied to the air supply chamber 15 is supplied from the blow nozzle 50 into the coating chamber 20.

  As shown in FIG. 2, the blowout nozzle 50 includes a blowout port 51 formed in the ceiling wall 20 </ b> T and a cover 52 that covers the blowout port 51 from below (that is, from the painting chamber 20 side). The cover 52 includes an opposing wall 53 disposed to face the air outlet 51, and an upright wall 54 that stands up from the outer edge of the opposing wall 53 and abuts against the opening edge of the air outlet 51.

  The opposing wall 53 and the standing wall 54 are made of a punching metal or a slit plate, and a plurality of openings 55 are formed in the opposing wall 53 and the standing wall 54. The opening 55 is formed by a punching hole in the punching metal, and is formed by a slit in the slit plate. The aperture ratio of the punching metal or slit plate constituting the facing wall 53 is larger than the aperture ratio of the punching metal or slit plate constituting the standing wall 54. In the example of this embodiment, the opening ratio of the punching metal or slit plate constituting the facing wall 53 is 45 to 55%, and the opening ratio of the punching metal or slit plate constituting the standing wall 54 is 20 to 30%. It is.

  FIG. 3 shows the flow of air supplied from the air supply chamber 15 to the painting chamber 20. As shown in the figure, the air in the supply chamber 15 is supplied from the blow nozzle 50 to the coating chamber 20. In the blowing nozzle 50, the amount of air passing through the facing wall 53 is larger than the amount of air passing through the standing wall 54 due to the difference in the opening ratio between the facing wall 53 and the standing wall 54. In other words, the amount of air discharged downward from the blowing nozzle 50 is larger than the amount of air discharged sideways. As a result, the air flow (wind speed) increases in the belt-like region R1 located below the blowout nozzle 50, and the air flow (wind speed) slows in the region R2 outside the belt-like region R1. In FIG. 3, the air flow is indicated by an arrow, and the longer the arrow, the faster the air flow.

  Here, in the painting booth 10 of this embodiment, the blowing nozzle 50 is arrange | positioned above the workpiece conveyance path WH. Accordingly, the air flow is fast around the work W (the movable range of the coating machine 22), and the air flow is slow at a place where the density of the paint mist is lower than that around the work W.

  Specifically, the blowing nozzles 50 are arranged in pairs above both side portions (both end portions in the booth width direction) of the work conveyance path WH, and above the center portion in the booth width direction of the work W, The blowing nozzle 50 is not disposed. Accordingly, in the region where the density of the paint mist is low above the workpiece W, the air flow is slow.

  As shown in FIG. 2, the filter 25 is laid on a wire mesh 27 fitted to the support frame 26. The filter 25 is pressed against the inside of the support frame 26 by a filter holder 29.

  As shown in FIGS. 4A and 5, the painting booth 10 includes a plurality of pairs of guide rails 40, 40 extending in the booth width direction along the ceiling wall 20 </ b> T of the painting chamber 20 ( FIG. 4A shows only one guide rail 40). The guide rail crosses the side wall of the air supply chamber 15, and both end portions of the guide rail 40 are disposed on the inner side and the outer side of the air supply chamber 15.

  A movable base 41 that is driven by a support frame drive source 41 </ b> K (see FIG. 6) and moves along the guide rail 40 is attached to the guide rail 40. The driving mechanism of the movable base 41 is, for example, a ball screw mechanism or a rack and pinion mechanism, and the driving source thereof is, for example, a stepping motor.

  The support frame 26 is supported by the pair of guide rails 40 and 40 so as to be linearly movable. Specifically, the support frame 26 is disposed between the pair of guide rails 40 and 40 and is sandwiched between the movable bases 41 and 41.

  As shown in FIGS. 4A and 4B, the filter 25 has a first position (FIG. 4A) covering the entire outlet 51 and a second position where the whole is out of the outlet 51 (FIG. 4A). 4 (B)). The replacement of the filter 25 is performed when the filter 25 is disposed at the second position. In the state where the filter 25 is disposed at the first position, the air in the air supply chamber 15 passes through the filter 25 and is supplied to the coating chamber 20. On the other hand, in the state where the filter 25 is disposed at the second position, the air in the supply chamber 15 is supplied to the coating chamber 20 without passing through the filter 25. In other words, when the filter 25 is disposed at the first position, the filter 25 is disposed in the middle of the air supply path. When the filter 25 is disposed at the second position, the filter 25 is detached from the air supply path. . Therefore, if the amount of air supplied to the air supply chamber 15 is the same, the state in which the filter 25 is disposed at the second position is higher than the state in which the filter 25 is disposed at the first position. The amount of air supplied from the air chamber 15 to the painting chamber 20 increases, and the flow of air in the painting chamber 20 becomes faster overall.

  As shown in FIG. 6, the coating booth 10 includes a filter drive control unit 61 that controls the movement of the filter 25. The filter drive control unit 61 is connected to a door lock device 62 provided on the door of the painting chamber 20 and a support frame drive source 41K that drives the movable base 41 (FIG. 5). The door lock device 62 changes between a locked state in which the unlocking of the door of the painting chamber 20 is prohibited and an unlocked state in which the unlocking of the door is allowed. When the door lock device 62 changes to the unlocked state, the door lock device 62 outputs a signal based on the state change to the filter drive control unit 61. And the filter drive control part 61 moves the filter 25 from a 1st position to a 2nd position based on reception of the signal based on the change to a lock release state.

  In the painting booth 10, in order to ensure the safety of the worker, it is required that the wind speed of the air in the painting chamber 20 when the worker enters the painting chamber 20 is equal to or higher than a predetermined reference wind velocity. Is done. In order to satisfy this requirement, the coating booth 10 is provided with an air supply control unit 63 that controls the amount of air supplied from the supply chamber 15 to the coating chamber 20 (FIG. 6). The air supply control unit 63 controls, for example, a blower for supplying air, a damper attached to an air supply path, a fan inverter, and the like. An air flow meter 64 is connected to the air supply control unit 63. The air flow meter 64 measures the air flow in the painting chamber 20 and outputs the measurement result to the air supply control unit 63. The air supply control unit 63 controls the air supply amount based on the measurement result of the air flow meter 64.

  This completes the description of the configuration of the painting booth 10 according to the present embodiment. Next, the effect of the painting booth 10 will be described.

  In the painting booth 10 of the present embodiment, the cover 52 that covers the outlet 51 from the painting chamber 20 side is composed of the facing wall 53 and the standing wall 54, and the opening ratio of the punching metal or slit plate constituting the facing wall 53 is the standing wall. Since the opening ratio of the punching metal or the slit plate constituting 54 is larger, the air velocity of the air flowing to the coating chamber 20 through the opening of the opposing wall 53 flows to the coating chamber 20 through the opening of the upright wall 54. Higher than the wind speed. That is, in this embodiment, the air velocity supplied to the coating chamber 20 varies. As a result, it is possible to increase the wind speed at a location where the need for air supply is high, and to reduce the wind speed at a location where the need for air supply is low, thereby suppressing overspecification of the air supply.

  Moreover, in the painting booth 10 of this embodiment, since the blowing nozzle 50 is arrange | positioned above the workpiece conveyance path WH, while increasing the wind speed around the workpiece | work W, the density of paint mist is lower than the surroundings of the workpiece | work W. The wind speed can be lowered at a certain point. As a result, the air supply efficiency is improved.

  Furthermore, in the painting booth 10 of the present embodiment, the paint is sprayed from the side on the workpiece W, and the blowout nozzles 50 are arranged in pairs above both sides of the workpiece conveyance path WH. Even in the region where the density of the paint mist is low above the workpiece W, the wind speed can be lowered, so that the air supply efficiency is improved.

[Other Embodiments]
(1) In the above embodiment, only one blowing nozzle 50 may be provided above the workpiece conveyance path WH.

  (2) In the above embodiment, the filter 25 may be driven manually.

  (3) In the above embodiment, if the air speed when the air supply amount filter 25 is disposed at the second position is equal to or higher than the reference wind speed, the supply of air supplied from the supply chamber 15 to the coating chamber 20 The amount may be fixed.

  (4) In the above embodiment, the filter 25 is a roll filter stretched between the feed roller and the take-up roller, and the air outlet 51 is covered with a portion disposed between the two rollers. Good. In addition, what is necessary is just to wind up a filter with a winding roller when replacing | exchanging the filter 25. FIG.

DESCRIPTION OF SYMBOLS 10 Coating booth 20 Coating chamber 21 Floor conveyor 50 Blowing nozzle 51 Blowing outlet 52 Cover 53 Opposite wall 54 Standing wall

Claims (3)

A painting booth in which air is supplied to the painting chamber from a blowout nozzle provided on the ceiling of the painting chamber,
The blowout nozzle has a blowout port formed in the ceiling of the painting chamber, and a cover that covers the blowout port from the painting chamber side,
The cover is composed of an opposing wall disposed to face the air outlet, and an upright wall that stands up from an outer edge portion of the opposing wall and abuts against an opening edge of the air outlet,
The opposing wall and the standing wall are both made of a punching metal or a slit plate, and an opening ratio of the punching metal or the slit plate constituting the opposing wall is an opening of the punching metal or the slit plate constituting the standing wall. Is greater than the rate. In the painting booth according to claim 1,
The blowing nozzle is disposed above a work conveyance path through which a work is conveyed in the coating chamber. In the painting booth according to claim 2,
The blow-out nozzles are arranged in pairs above both end portions in the width direction of the work conveyance path.

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