JP2017196553A - Cleaning method for floor duct in powdered paint booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively clean a floor duct 25 installed to the underfloor of a paint booth 21 without making excess-spray powders upflow from a floor suction slit 26 of the paint booth 21 into the booth 21.SOLUTION: An objective cleaning method for a floor duct 25 in a paint booth 21 comprises setting the floor duct 25 sucking excess-spray powders to the underfloor of a floor face 22 in the paint booth 21, installing a suction slit 26 on the floor face 22 opening along the floor duct 25, and sucking the excess-spray powders in the booth 21 into the floor duct 25 through the suction slit 26. The method is configured to clean the inside of the floor duct 25 from the end of an upstream side of the duct 25 in a suction direction toward the downstream side in such a state as closing the suction slit 26 on the floor face of the booth 21 using a plug 31.SELECTED DRAWING: Figure 2

Description

  In the present invention, a floor duct that sucks overspray powder is installed under the floor of the powder coating booth, and a suction slit that opens along the floor duct under the floor is provided on the floor. The present invention relates to a method for cleaning a floor duct in a powder coating booth in which overspray powder in the painting booth is sucked into the floor duct through a slit.

  Powder coating does not contain organic solvents and is used in many ways as an environmentally friendly coating. Initially, it was widely used for products used mainly outdoors, such as guardrails, gates, and fences, but after that, it was used for refrigerators, washing machines, microwave ovens, outdoor units of air conditioners, steel furniture, partitions, etc. Many products are also used in places. It is also widely used for automotive parts, one of the key industries in Japan. For example, it is used for painting body parts of automobiles, in addition to paints such as wipers, aluminum wheels, brake pads, oil filters, and coil springs. In particular, it has recently been adopted for school children's chairs and desks due to its non-polluting characteristics.

  Powder coating has the advantage that the overspray powder that has not adhered to the object can be reused, but color change is a problem compared to solvent coating.

  In the case of solvent coating, for example, even if a little B color is mixed into A color, no mixed color is seen.

  However, in the case of powder coating, when powder coating particles of another color are mixed with the powder coating particles, the mixed powder coating is cured as it is and appears in the coating film as contamination.

  Therefore, in powder coating, the coating booth must be sufficiently cleaned so that contamination does not occur during color change.

  By the way, conventionally as a powder coating booth for performing powder coating, a floor duct 5 for supplying overspray powder to a cyclone 3 as a recovery device under the floor 2 of the coating booth 1 as shown in FIG. There is what installed.

  The floor 2 of the painting booth 1 is provided with a suction slit 6 that opens along the floor duct 5 under the floor at the corner between the floor 2 and the wall 9. The overspray powder inside is sucked into the floor duct 5, and the sucked overspray powder is collected by the cyclone 3. Exhaust gas from the cyclone 3 is supplied to a dust collector 4 having a cartridge filter 8.

  Further, an air blow nozzle 7 for sending overspray powder collected on the floor surface 2 toward the suction slit 6 is installed in the center of the floor surface 2 of the painting booth 1.

  The air flow in the painting booth 1 and the air flow in the floor duct 5 are indicated by arrows in FIG.

  The painting booth 1 in which the floor duct 5 is installed under the floor as described above needs to clean the inside of the floor duct 5 together with the floor 2 and the wall surface 9 when changing colors.

  Conventionally, as shown in the schematic diagram of FIG. 5, cleaning in the floor duct 5 under the floor is performed by opening the upstream end in the suction direction of the floor duct 5 under the floor from the outside of the painting booth 1. The air blow device 10 is inserted into the floor duct 5 from the outside, the air blow device 10 is placed on a carriage or the like and moved in the floor duct 5, and the inside of the floor duct 5 is cleaned by air blow (Patent Document). 1).

  In FIG. 5, reference numeral 11 denotes an object to be coated, and 12 denotes a transport hanger for the object to be coated.

JP 2000-42453 A

  However, as described above, when one end of the floor duct 5 is opened from the outside of the painting booth 1 and the air blowing device 10 is inserted to perform air blowing, the suction slit 6 provided on the floor 2 of the painting booth 1 is used. The powder coating in the floor duct 5 flows back into the painting booth 1 and adheres to the floor 2 and the wall 11 of the cleaned painting booth 1, and the floor 2 and the wall 9 need to be cleaned again. There is a problem that the cleaning work takes time and the color change time becomes long.

  The floor duct 5 under the floor is provided with slits 6 along the floor duct 5, so that when air is blown from one end, the center of the floor duct 5 where the air is installed horizontally is provided. It was difficult to clean the powder paint adhering to the inner surface of the recovery duct 5.

  For this reason, it is difficult to clean the inside of the painting booth 1 and the collection duct 5 completely, and a mixed color in which the powder coating color changed in color is mixed with the previous powder coating color, and a large amount is required until the mixed color settles. Recovered powder must be treated as industrial waste.

  Therefore, the present invention is intended to effectively clean the floor duct without causing the cleaning of the floor duct installed under the floor of the painting booth to flow backward from the suction slit on the floor of the painting booth into the painting booth. It is.

  In order to solve the above-mentioned problems, the present invention is configured to install a floor duct that sucks overspray powder under the floor surface of the powder coating booth, and to the floor surface along the floor duct under the floor. In the method of cleaning a floor duct in a powder coating booth in which an opening suction slit is provided and the overspray powder in the coating booth is sucked into the floor duct through this suction slit, when the interior of the floor duct is cleaned, The suction slit on the floor surface of the body painting booth is closed and the floor duct is cleaned from the upstream end in the suction direction of the floor duct toward the downstream side.

  The inside of the floor duct can be cleaned by air blowing from the upstream end in the suction direction of the floor duct.

  The air blow nozzle inserted from the upstream end of the floor duct in the suction direction can be constituted by a flexible air hose. Since the flexible air hose vibrates due to the ejection of air, the overspray powder adhering to the floor duct can be effectively removed by this vibration.

  The air blow nozzle desirably performs air blow while moving from the upstream side to the downstream side in the suction direction.

  You may make it perform the ejection of the air from the said air blow nozzle intermittently.

  According to the present invention, when the floor duct is cleaned, the suction slit on the floor of the powder coating booth is plugged and closed, so that the leakage of the powder coating from the suction slit into the coating booth It can prevent sticking out.

  In addition, if the air suction blows from the upstream end in the suction direction of the floor duct while the suction slit on the floor of the powder coating booth is closed and closed, the powder paint attached to the floor duct is effectively removed. It is removed and the floor duct cleaning effect is high.

It is a fragmentary sectional view showing an example of a painting booth which cleans by this invention. When performing the cleaning operation | work of the painting booth by this invention, it is a fragmentary sectional view which shows the state which closed the suction slit of the floor surface with the stopper. It is the schematic which shows the cleaning method of the bottom face duct installed in the floor surface of the painting booth. It is a fragmentary sectional view showing a painting booth. It is the schematic which shows the conventional cleaning method of the bottom face duct installed in the floor surface of the painting booth.

  Embodiments of the present invention will be described below.

  FIG. 1 shows an example of a painting booth 21 that performs cleaning according to the present invention.

  In FIG. 1, the coating booth 21 is shown in a partial cross section, and a floor duct 25 that collects overspray powder by a cyclone 23 is installed under the floor 22.

  The floor 22 of the painting booth 21 is provided with a suction slit 26 that opens along the floor duct 25 under the floor at the corner between the floor 22 and the wall 27, and the painting booth 21 passes through the suction slit 26. The overspray powder inside is sucked into the floor duct 25, and the sucked overspray powder is collected by the cyclone 23. Exhaust gas from the cyclone 23 is supplied to a dust collector 29 having a cartridge filter 28.

  Further, an air blow nozzle 30 for sending overspray powder collected on the floor surface 22 toward the suction slit 26 is installed in the center of the floor surface 22 of the painting booth 21.

  The air flow in the painting booth 21 and the air flow in the floor duct 25 are indicated by arrows in FIG.

  The floor 22 and the wall 27 of the painting booth 21 are made of resin panels, and the floor duct 25 is made of stainless steel.

  The painting booth 21 is cleaned by cleaning the floor surface duct 25 after cleaning the floor surface 22 and the wall surface 27.

  When cleaning the inside of the floor duct 25, the suction slit 26 on the floor 22 is plugged 31 and the suction slit 26 is closed.

  Cleaning in the floor duct 25 is performed in a state where the cyclone 23 and the dust collector 29 are driven, that is, in the suction direction of the floor duct 25 as shown in FIG. The end portion is opened, and cleaning is performed from the upstream end portion in the suction direction of the floor duct 25 toward the downstream side.

  Since the inside of the floor duct 25 is in a suction state, the stopper 31 can be forcibly caught by the suction slit 26 to close the suction slit 26 when placed on the floor surface 22 side.

  For this reason, as long as it is the shape which can be put from the floor 22 side and can close the suction slit 26 as the stopper 31, materials, such as a vinyl chloride pipe, a metal pipe, and a plate processed product, are not chosen.

  For example, as shown in FIG. 3, the floor duct 25 is cleaned by opening the upstream end in the suction direction of the floor duct 25 below the floor from the outside of the painting booth 21 and opening the floor duct from the outside of the painting booth 21. The air blow device 32 is inserted into the interior 25, the air blow device 32 is placed on a carriage or the like and moved in the floor duct 25, and the floor duct 25 is cleaned by air blow.

  Further, cleaning may be performed by inserting an air blow nozzle from an upstream end of the floor duct 25 in the suction direction so as to supply air into the floor duct 25.

  The air blow nozzle inserted into the upstream end portion of the floor duct 25 in the suction direction can be constituted by a flexible air hose.

  When the air blow nozzle is constituted by a flexible air hose, the flexible air hose vibrates in the floor duct 25 due to the ejection of air, and the overspray powder adhering to the floor duct 25 is effectively removed by this vibration. 23 is aspirated.

  Even if air blown air is supplied into the floor duct 25, the suction slit 26 of the floor duct 25 is closed by the stopper 31, so that the powder paint leaks into the coating booth 21 from the suction slit 26. Therefore, when the inside of the floor duct 25 is cleaned, the inside of the painting booth 21 is not contaminated again by the powder paint.

By intermittently ejecting air from the air blow nozzle, the powder paint adhering to the floor duct 25 can be more effectively peeled off.
In FIG. 3, reference numeral 33 denotes an object to be coated, and 34 denotes a transport hanger for the object to be coated.

21: Coating booth 22: Floor 23: Cyclone 25: Floor duct 26: Suction slit 27: Wall 28: Cartridge filter 29: Dust collector 30: Air blow nozzle 31: Plug 32: Air blow device 33: Object 34: Transport hanger

Claims (6)

  A bottom duct that sucks overspray powder is installed under the floor of the powder coating booth, and a suction slit that opens along the bottom duct under the floor is provided on the floor. In the method of cleaning the bottom duct in the powder coating booth that sucks overspray powder into the bottom duct, when the inside of the floor duct is cleaned, the suction slit on the floor of the powder coating booth is plugged and closed And cleaning the floor duct in the powder coating booth, wherein cleaning is performed from the upstream end in the suction direction of the floor duct toward the downstream side.   2. The method of cleaning a bottom duct in a powder coating booth according to claim 1, wherein air blow is performed from an upstream end portion in the suction direction of the floor duct.   The method of cleaning a bottom duct in a powder coating booth according to claim 2, wherein the air blow is performed by inserting an air blow nozzle into the bottom duct from the upstream end in the suction direction of the floor duct.   An air blow nozzle inserted into the bottom duct from the upstream end in the suction direction of the bottom duct is constituted by a flexible air hose, and the flexible air hose is vibrated by the ejection of air and adheres to the bottom duct by this vibration. 4. The method of cleaning a bottom duct in a powder coating booth according to claim 3, wherein overspray powder is removed.   The method of cleaning a bottom duct in a powder coating booth according to claim 3 or 4, wherein the air blow is performed while moving the air blow nozzle from the upstream side toward the downstream side in the suction direction of the bottom duct.   The method of cleaning a bottom duct in a powder coating booth according to any one of claims 2 to 5, wherein air is intermittently ejected from the air blow nozzle.

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