JP4676388B2 - Electrostatic powder coating equipment - Google Patents

Description

  The present invention relates to an electrostatic powder coating apparatus capable of cleaning an inner wall of a painting booth while moving an object to be coated in the painting booth by a conveyor.

Electrostatic powder coating is a coating method in which a powder coating is sprayed onto an object to be coated with an electrostatic coating gun, and the powder coating is adhered to the object by static electricity.
In this electrostatic powder coating, spraying of a powder coating material to an object to be coated is usually performed in a coating booth in order to prevent the powder coating material from scattering. And in the coating line which performs electrostatic powder coating continuously, a to-be-coated object is hung on the hanger of a conveyor, and powder coating is sprayed with respect to the to-be-coated object which moves the inside of a coating booth.

  As shown in FIGS. 18 to 20, the coating line for performing electrostatic powder coating includes a coating material loading portion 23 for hanging the coating material A on a hanger 22 of the conveyor 21 along a circulating conveyor 21, and a front side. A processing device 24, a draining / drying furnace 25, a painting booth 26, a baking / drying furnace 27, a natural / forced cooling unit 28, and a coating material unloading unit 29 for removing the coating material A from the hanger 22 of the conveyor 21 are provided.

  The article A to be coated is hung on the hanger 22 of the conveyor 21 in the article receiving section 23, and then pre-degreased, degreased, washed with water, adjusted with zinc phosphate or iron phosphate, washed with water, purified. Washing with water is performed, drying is performed in a draining and drying furnace 25, and the resultant is sent to the painting booth 26. The coating material A is sprayed by an electrostatic coating gun 30 installed in the painting booth 26 while moving in the painting booth 26, and then the coating material A is baked and dried in a baking oven 27. Then, after the natural / forced cooling unit 28, the coated material A is removed from the hanger 22 of the conveyor 21 in the coated material unloading unit 29, and the coating is completed.

  By the way, electrostatic powder coating does not contain an organic solvent, and overspray powder that has not adhered to the object A to be coated can be collected and reused in the coating booth 26, and thus is attracting attention year by year as a coating that is good for the environment. However, this electrostatic powder coating has a problem that it takes time to change the coating color.

  In other words, powder paints do not melt like solvent paints when mixed with other colors, unlike solvent paints, but the powder paint particle color comes out as it is, and it becomes a paint film with a mixed color. End up.

  For this reason, in electrostatic powder coating, it is necessary to clean the inner wall of the coating booth 26, not to mention the coating gun 30 and the powder coating hose, when changing colors.

  However, when the inner wall of the coating booth 26 is cleaned in a coating line in which electrostatic powder coating is continuously performed, the object A suspended on the conveyor 21 is successively transferred to the coating booth 26 for cleaning. Since the powder adheres to the object A to be coated and the object A becomes dirty, the conveyor 21 must be stopped during the cleaning of the coating booth 26 so that the cleaning powder does not adhere to the object A to be coated. The decrease in the coating production amount due to the stop of the conveyor 21 is a very serious problem in a coating line where the number of color changes is large.

  In addition, when the conveyor 21 is stopped, if the article A is in the baking / drying furnace 27, the baking time becomes longer than specified, so that the coating film turns yellow or the coating film performance is increased. The problem that it deteriorates also arises. Further, when the conveyor 21 is stopped for a long time, the article A is left in the pretreatment device 24 for a long time, so that the basis weight of the pretreatment agent is changed and the coating film performance is remarkably changed.

In order to eliminate the overbaking or the change in the basis weight of the pretreatment agent caused by stopping the conveyor 21, the article A to be coated on the line from the pretreatment device 24 to the baking / drying furnace 27 is removed from the hanger 22 of the conveyor 21. However, if this is done, it takes time to detach the hanger 22, and the production volume is extremely reduced in a line where color change is frequently performed.
Conventionally, in order to shorten the cleaning time of the painting booth 26 at the time of such color change, the air blowing device is automatically moved along the inner wall of the painting booth 26 as disclosed in Patent Document 1. An automatic air blower that cleans the air is also developed.

  However, even if the cleaning time is shortened by such an automatic air blowing device, the conveyor 21 is stopped during that time, the article A is removed from the hanger 22 of the conveyor 21, and there is no article in the painting booth 26. The cleaning work cannot be started unless it is in a state.

  In addition, as shown in FIG. 21, two painting booths 26 are installed in the painting line, the painting booth 26 to be cleaned is removed from the painting line, and the painting booth 26 is removed from the painting line and is in the painting line. The painting stop time by cleaning the painting booth 26 is shortened as much as possible by painting using another painting booth 26. However, even in this method, in order to move the painting booth 26 from the painting line, the hanger 22 and the workpiece A of the conveyor 21 are removed, and the hanger 22 and the workpiece A are not in the painting booth 26. Since the painting booth 26 cannot be moved out of the painting line, the detaching operation of the hanger 22 of the conveyor 21 is essential, and the detaching operation of the hanger 22 takes time, and the production amount is reduced by stopping the painting line. There's a problem.

  Therefore, the present invention is intended to enable the painting booth to be cleaned without moving the hanger of the article to be coated, with the article being moved within the painting booth to be cleaned. is there.

JP 2000-176327 A

  In order to solve the above problems, the present invention provides an inner surface of a coating booth in an electrostatic powder coating apparatus in which a powder coating is sprayed by an electrostatic coating gun in a coating booth while moving an object to be coated along a conveyor. When cleaning, remove the moving object so that the cleaning powder does not adhere to the object moving inside the painting booth between the object moving inside the painting booth and the inner wall of the painting booth. The surrounding cleaning powder adhesion prevention hood is installed, and the inner wall of the painting booth can be cleaned while the object to be coated is moved by the conveyor.

  Two coating booths may be installed on the left and right along the conveyor, and a cleaning powder adhesion preventing hood that can be inserted into the left and right coating booths may be installed between the two coating booths.

  The cleaning powder adhesion preventing hood can be formed in a tunnel shape. In addition, the cleaning powder adhesion preventing hood may be divided into two parts on the left and right sides to allow insertion into the painting booth from the entrance side and the exit side of the painting booth.

  Further, the cleaning powder adhesion preventing hood may have a bellows shape so that the bellows can be extended and inserted into the painting booth.

  Further, the cleaning powder adhesion preventing hood may be formed by a plurality of horizontal panels provided in a take-up manner, and the take-up drum of the panel may be provided on the top surface of the painting booth.

  In addition, the front and back wall surfaces of the cleaning powder adhesion prevention hood are composed of a plurality of vertical strip-shaped panels, and a storage for these multiple panels is provided outside the painting booth, and the storage is stored in the painting booth. A moving rail of the panel may be installed so as to enter, and the front and rear wall surfaces of the cleaning powder adhesion preventing hood may be formed by moving the panel along the moving rail.

  The length of the cleaning powder adhesion prevention hood is longer than the length of the painting booth, and with the cleaning powder adhesion prevention hood installed in the painting booth, both ends of the cleaning powder adhesion prevention hood are outside the ends of the painting booth. It is preferable that it is located in.

  Alternatively, the position of the cleaning powder adhesion preventing hood may be fixed, the coating booth may be moved, and the coating booth may be moved to cover the cleaning powder adhesion preventing hood.

  According to this invention, when performing the cleaning work of the painting booth, it is possible to surround the object to be moved through the painting booth by the cleaning powder adhesion prevention hood, so without performing the detaching operation of the hanger of the object to be coated, Since the painting booth can be cleaned while the object to be coated is moved in the painting booth to be cleaned, it is possible to solve the problem of a decrease in production due to the suspension of the painting line.

  1 to 4 show a painting line in which two painting booths 2 are installed on the conveyor 1. The conveyor 1 includes a rail 3, a hanger 4 that suspends the article A to be coated, and a roller 5 that moves the hanger 4 along the rail 3. A large number of hangers 4 are installed on the conveyor 1 at predetermined intervals.

  In the painting booth 2, a pair of electrostatic coating guns 6 for spraying a powder coating onto the article A to be coated are disposed at positions shifted forward and backward so as to oppose both surfaces of the article A to be coated. It is installed to move up and down. Further, in order to collect the overspray powder, two rows of hopper type ducts are formed on the bottom surface of the painting booth 2, and the overspray powder is sucked by the suction means.

  In the painting line of FIG. 1, a tunnel-type cleaning powder adhesion preventing hood 7 is installed between two painting booths 2.

  The tunnel-type cleaning powder adhesion preventing hood 7 is suspended from a rail 8 provided in parallel with the rail 3 of the conveyor 1 so as to be movable to the left and right. As shown in FIG. The booth 2 can be inserted into the painting booth 2 from the inlet side of the article A to be coated, and the left side of the painting booth 2 can be inserted into the painting booth 2 from the outlet side of the article A to be coated. It has become.

  The left and right lengths of the tunnel-type cleaning powder adhesion preventing hood 7 are formed to be longer than the left and right lengths of the painting booth 2, and the cleaning powder adhesion preventing hood 7 is inserted into the painting booth 2 as shown in FIG. In addition, both ends of the cleaning powder adhesion preventing hood 7 protrude outside the both ends of the painting booth 2. The length of the cleaning powder adhesion preventing hood 7 does not need to be longer than that of the entrance / exit hood when a tunnel-type hood is provided at the entrance / exit of the painting booth 2, but at least the main body of the painting booth 2 It is necessary to make it longer than the length of the cleaning powder so that the cleaning powder is not caught from both ends of the cleaning powder adhesion preventing hood 7.

  As shown in FIGS. 3 and 4, the article A to be coated can move in the tunnel type cleaning powder adhesion preventing hood 7 with the cleaning powder adhesion preventing hood 7 inserted into the painting booth 2. In addition, a cleaning space B is formed between the outer surface of the cleaning powder adhesion preventing hood 7 and the inner surface of the painting booth 2, and when cleaning the inside of the painting booth 2 by color change, The worker can enter and perform the cleaning work manually, or the automatic air blow device installed in the cleaning space B can perform the cleaning work. When the cleaning space B is manually cleaned, the cleaning space B needs to have a width of at least about 700 mm, and the wider the width, the better the workability.

  3 and 4, even if the article A passes through the painting booth 2 while being suspended on the hanger 4 during the cleaning operation, the article A remains the cleaning powder adhesion preventing hood 7. Therefore, the cleaning powder is prevented from adhering to the object A to be coated.

  Therefore, in the painting line of FIG. 1, when switching from the painting booth 2 on the right side to the painting booth 2 on the left side, the painting work on the painting booth 2 on the right side is stopped and the painting work on the painting booth 2 on the left side is performed. When the object A coated in the left painting booth 2 is moved to the right painting booth 2 before being moved to the right painting booth 2, the cleaning powder adhesion preventing hood 7 is moved into the right painting booth 2. The inner surface of the right painting booth 2 can be cleaned without stopping the movement of the object A.

  The cleaning powder adhesion prevention hood 7 of FIGS. 1 to 4 is a tunnel type and is formed so as to surround both side surfaces, the bottom surface and the top surface, but a lower suction type painting booth 2 provided with suction means on the bottom surface. As shown above, when the overspray powder is little rolled up, the cleaning powder is not drawn into the cleaning powder adhesion prevention hood 7 from the bottom or top surface of the cleaning powder adhesion prevention hood 7. It is also possible to omit the bottom surface and the top surface of the cleaning powder adhesion preventing hood 7.

  Next, FIGS. 5-7 is embodiment which made the cleaning powder adhesion prevention hood 7 the bellows type. By using the bellows type, the cleaning powder adhesion preventing hood 7 can be shrunk when positioned between the two painting booths 2, as shown in FIG. Thereby, the distance between the two coating booths 2 can be shortened, and a coating line can be reduced in size.

  FIG. 6 shows a state where the bellows-type cleaning powder adhesion preventing hood 7 is extended and inserted into the right painting booth 2.

  Also in this embodiment, as shown in FIG. 7, the cleaning powder adhesion preventing hood 7 is hung from a rail 8 provided in parallel with the rail 3 of the conveyor 1 so as to be movable left and right. As shown in FIG. 6, the painting booth 2 can be inserted into the painting booth 2 from the inlet side of the article A to be coated, and the left painting booth 2 has the inside of the painting booth 2 from the outlet side of the article A to be coated. So that it can be inserted into.

  Next, FIGS. 8 to 9 show an embodiment in which the tunnel-type cleaning powder adhesion preventing hood 7 is divided into left and right parts, and half are inserted from the entrance side and the exit side of the painting booth 2. . In this embodiment, since the length of the cleaning powder adhesion preventing hood 7 between the painting booth 2 and the painting booth 2 is halved, the coating line can be reduced in size, and the cleaning powder adhesion preventing hood 7 is moved. Time can be shortened.

  Next, FIG. 10 shows that the tunnel type cleaning powder adhesion preventing hood 7 is fixedly installed between the two painting booths 2 so that the left and right painting booths 2 can be moved toward the cleaning powder adhesion preventing hood 7 respectively. In this embodiment, the cleaning powder adhesion preventing hood 7 is covered with the coating booth 2 to be cleaned.

  Next, in FIGS. 11 to 13, the front and rear wall surfaces of the cleaning powder adhesion preventing hood 7 are constituted by a plurality of horizontal panels 9 that can be wound upward, and the winding drum 10 of the panel 9 is connected to the coating booth 2. It is embodiment provided in the top | upper surface.

  FIG. 11 shows a state in which the panel 9 is lowered and the cleaning powder adhesion preventing hood 7 is installed in the painting booth 2. The lower ends of the front and rear panels 9 are joined to each other with a magnet or the like so that the lower surface is bonded. Can be enclosed. Further, as shown in FIG. 12, with the panel 9 wound around the winding drum 10 on the top surface of the painting booth 2, the lowermost panel 9 is folded inward and the electromagnet 11 provided on the top surface of the painting booth 2. By joining together, the gap on the top surface of the painting booth 2 can be narrowed, and leakage of overspray powder from the gap on the top surface can be more effectively prevented.

  Next, in FIGS. 14 to 17, the front and rear wall surfaces of the cleaning powder adhesion preventing hood 7 are constituted by a plurality of vertical strip-shaped panels 12, and two storage boxes 13 for the plurality of panels 12 are provided. The moving rails 14 are installed so that the panels 12 enter the left and right painting booths 2 in two directions from the respective storages 13 to the left and right painting booths 2 respectively. ing. The moving rail 14 is divided into left and right from the storage 13 and is installed so as to cross the painting booth 2 in the same direction as the moving direction of the conveyor 1. By moving the panel 12 along the moving rail 14, The front and back wall surfaces of the cleaning powder adhesion preventing hood 7 are formed in the left and right coating booths 2.

  FIG. 14 shows a state in which the panel 12 is pulled out from the storage case 13 and encloses the front and back of the article A to be moved in the painting booth 2. FIG. 15 shows the details of the moving rail 14 of the panel 12. This moving rail 14 is installed so as to be drawn into the left and right painting booths 2, as shown in FIGS. 16 and 17, and FIG. FIG. 17 shows a state in which the panel 12 is pulled out from the storage 13 and FIG. 17 shows a state in which the panel 12 is drawn into the right painting booth 2 and surrounds the front and rear of the article A moving through the painting booth 2.

  An air blow device for cleaning the panel 12 may be provided in front of the storage 13 so that the panel 12 can be cleaned when the panel 12 is pulled into the storage 13.

It is the schematic which shows the electrostatic powder coating apparatus of this invention which installed two coating booths in the coating line, and installed the tunnel type cleaning powder adhesion prevention hood between the coating booths. It is the schematic of embodiment of FIG. 1 which moved the cleaning powder adhesion prevention hood and inserted in the painting booth on the right side. It is sectional drawing of the AA line of FIG. It is sectional drawing of the BB line of FIG. It is the schematic which shows the electrostatic powder coating apparatus of this invention which installed two coating booths in the coating line and installed the bellows type cleaning powder adhesion prevention hood between the coating booths. It is the schematic of embodiment of FIG. 5 which extended the bellows type cleaning powder adhesion prevention hood and inserted in the painting booth on the right side. It is sectional drawing of the CC line of FIG. It is the schematic which shows the electrostatic powder coating apparatus of this invention which divided the cleaning powder adhesion prevention hood into right and left, and was able to insert the cleaning powder adhesion prevention hood into the painting booth from the entrance side and the exit side of the painting booth. . It is the schematic which shows the state which inserted the cleaning powder adhesion prevention hood in the painting booth in embodiment of FIG. In the schematic diagram showing the electrostatic powder coating device of the present invention, the position of the cleaning powder adhesion prevention hood is fixed, the left and right painting booths can be moved, and the painting booth is moved to cover the painting booth on the cleaning powder adhesion prevention hood. is there. It is the schematic which shows the electrostatic-powder coating apparatus of this invention which provided the cleaning powder adhesion prevention hood in the painting booth by dropping the horizontal type panel provided in the winding type. It is the schematic of embodiment of FIG. 11 which shows the state wound up by the winding drum provided in the top | upper surface of the painting booth with the several horizontal panel provided in the winding type. FIG. 12 is a cross-sectional plan view of the embodiment of FIG. The electrostatic strip of the present invention is provided with a plurality of vertical strip-shaped panels that form the front and back wall surfaces of the cleaning powder adhesion prevention hood, and the plurality of panels are moved into the painting booth to provide the cleaning powder adhesion prevention hood. It is the schematic which shows a powder coating apparatus. It is a perspective view which shows the relationship between the strip-shaped panel of FIG. 14, and a movement rail. It is the cross-sectional top view which provided the storage which accommodates the strip-shaped panel of FIG. 14 in the exterior of the painting booth. It is a cross-sectional top view which shows the state which pulled out the strip-shaped panel of FIG. 14 from the storage, and formed the cleaning powder adhesion prevention hood in the painting booth. It is a whole process figure of an electrostatic powder coating line. It is a side view which shows the relationship between a conveyor, a hanger, and a to-be-coated object. It is a front view which shows the relationship between a conveyor, a hanger, and a to-be-coated object. It is a cross-sectional top view of the conventional electrostatic powder coating apparatus which removes one of the two coating booths from a coating line, and performs a cleaning operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyor 2 Coating booth 3 Rail 4 Hanger 5 Roller 6 Electrostatic coating gun 7 Cleaning powder adhesion prevention hood 8 Rail 9 Panel 10 Winding drum 11 Electromagnet 12 Panel 13 Storage 14 Moving rail

Claims (9)

  In an electrostatic powder coating device that sprays powder paint with an electrostatic coating gun in the painting booth while moving the workpiece along the conveyor, the inside of the painting booth is moved when cleaning the inner surface of the painting booth. A cleaning powder adhesion prevention hood that surrounds the moving workpiece is installed between the workpiece and the inner wall of the painting booth to prevent the cleaning powder from adhering to the workpiece moving inside the painting booth. An electrostatic powder coating apparatus characterized in that the inner wall of the painting booth can be cleaned while the state is moved by a conveyor.   The two coating booths are installed on the left and right along the conveyor, and a cleaning powder adhesion preventing hood that can be inserted into the left and right painting booths is movably installed between the two painting booths. Electrostatic powder coating equipment.   The electrostatic powder coating apparatus according to claim 1 or 2, wherein the cleaning powder adhesion preventing hood has a tunnel shape.   The electrostatic powder coating apparatus according to any one of claims 1 to 3, wherein the cleaning powder adhesion preventing hood is divided into left and right parts and can be inserted into the painting booth from the entrance side and the exit side of the painting booth.   The electrostatic powder coating apparatus according to any one of claims 1 to 4, wherein the cleaning powder adhesion preventing hood has a bellows shape and can be inserted into a painting booth by extending the bellows.   The electrostatic powder coating according to claim 1 or 2, wherein the cleaning powder adhesion preventing hood is formed by a plurality of horizontal panels provided in a take-up manner, and a panel take-up drum is provided on the top surface of the painting booth. apparatus.   The front and back walls of the cleaning powder adhesion prevention hood are composed of a plurality of vertical strip-shaped panels, and the storage of these panels is installed outside the painting booth so that it can enter the painting booth from the storage. The electrostatic powder coating apparatus according to claim 1, wherein a moving rail of the panel is installed on the front and the wall is moved along the moving rail to form front and rear wall surfaces of the cleaning powder adhesion preventing hood.   The length of the cleaning powder adhesion prevention hood is longer than the length of the painting booth, and with the cleaning powder adhesion prevention hood installed in the painting booth, both ends of the cleaning powder adhesion prevention hood are outside the ends of the painting booth. The electrostatic powder coating apparatus according to claim 1, which is located in   The electrostatic powder coating apparatus according to claim 1, wherein the position of the cleaning powder adhesion preventing hood is fixed and the coating booth is movable to the left and right, and the coating booth is moved to cover the cleaning powder adhesion preventing hood.

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