JP2000042453A - Cylindrical collection trough for recovery of coating material and cleaning tool for suction duct in electrostatic powder coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate replacement of a collection trough and its wet cleaning by providing a nozzle ring for air blowing to an inner surface of the collection trough or a suction duct, and a winding-up device wherein a connected wire rope is taken up, and a cleaning tool main body which has been advanced by suction of an exhaust fan is returned to an original position. SOLUTION: The cleaning tool 32 advances in a collection trough 24 by a differential pressure before and after being generated by motion of an exhaust fan 25, and it is stopped by a stopper 34 contactingly provided to an end through a bent suction duct 26. Then, a retracting reciprocating is executed by winding a connected wire rope 35 around a winding drum. During this time, a coating material deposited to an inner wall is peeled off mechanically by rotation of an equipped annular mop or a annular brush 44 and the air blow from a nozzle ring 49, and exhausted together with an exhaust gas flow. Thereby, cleaning can be rapidly executed only by dry cleaning. Therefore, the collection trough 24 is not required to be changed for each replacement of coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning tool for easily and completely cleaning the inside of a paint collection system when changing paint in an electrostatic powder coating apparatus which handles paint of different colors and / or resins. .

[0002]

2. Description of the Related Art One of the great advantages of an electrostatic powder coating is that a coating that cannot be applied to a substrate by spraying can be recovered and reused, thereby increasing the yield of the coating by 90% or more. Can be increased. Collection of paint in electrostatic powder coating is usually performed as shown in FIG. The figure shows a plan view of the circulation coating conveyor line. An object to be coated (hereinafter referred to as a work) is loaded on a hanger suspended on the conveyor at a point A on the conveyor 1 and is carried into the coating booth 2. Painting booth 2
Has two areas for applying powdered paint sequentially charged from both sides in the work transport direction. In each area, a plurality of spray guns 3 and 7, which are controlled by coating materials 4 and 8, respectively, and charge and spray-coat the powder paint under predetermined conditions, are provided.
The reciprocators 5 and 9 respectively reciprocate up and down as needed to sequentially paint workpieces that are continuously carried in. Next, the workpiece is a baking furnace 1
9 and is baked for a predetermined temperature and time, then cooled while being conveyed by the conveyor 1 and unloaded at point B.

[0003] Each spray gun 3 of the painting booth 2
In the lower part of each of the opposed sides of 7, there are provided suction ports 10, 10 ′ connected to exhaust fans 14, 18, respectively, for sucking oversprayed paint and sending it to cyclones 12, 16. The air passing through the cyclones 12 and 16 separates and collects most of the paint contained therein, and further captures fine powder by the bag filters 13 and 17 and exhausts the exhaust fan 14.
It is discharged outside through 18. The paint recovered in the cyclone in this manner is added to a paint supply tank provided for the paint materials 4 and 8, and is reused.

[0004]

SUMMARY OF THE INVENTION As described above,
Since the paint recovered in the cyclone can be reused, the paint yield is extremely high.On the other hand, when the paint of different color and / or resin is applied alternately on the same coating line,
It is necessary to carefully clean not only the coating system but also the painting booth and the collecting system at the time of changing the paint so that different kinds of coating materials are not mixed into the collected coating material. In other words, the powder coating has a high viscosity even when heated and melted, and does not disperse like the solvent coating.Therefore, when a different-color coating is mixed, a clear color spot is generated, and when different coating particles of resin are mixed, Crater is generated on the surface during the baking and cooling process due to the difference between the respective temperature-flow characteristics and the like, and the surface loses smoothness. Therefore, cleaning the entire coating apparatus every time the paint is changed requires a long stoppage of the line, and the equipment operation rate is significantly reduced.

[0005] The applicant of the present invention discloses, in Japanese Patent No. 2588687, "a coating booth having an inner wall made of a smooth insulating plastic material, having a Y-shaped cross section and forming a discharge port at a lower end of a downward slope. A cylindrical collecting trough detachably connected to a suction duct, one end of which is closed and the other end of which is closed, and the other end of which is paint-tightly connected to the discharge port, is detachably separated. And an electrostatic powder coating apparatus comprising a plurality of collecting troughs and a plurality of the paint depositing sections for each color. This makes it possible to easily replace parts that require a long time for cleaning during color change, and only requires a short cleaning of the booth in the color change work, greatly reducing the downtime of the line. .

However, when the type of resin constituting the paint is different, as described above, the influence of mixed contamination is even greater, and it may be difficult to completely prevent the occurrence of defective products even with the above-described apparatus. On the other hand, the present applicant proposed in Japanese Patent Application No. 9-82565 a method and an apparatus for changing paint using a gondola in which hot water shower nozzles are arranged in front and rear surfaces in the coating apparatus in the above patent. this is,
After the paint booth has been dry-cleaned by air blow, the parts on which the paint has been deposited are replaced to collect the paint, and the non-replaced parts are wet-washed with a hot water shower, and then the next paint replacement parts are installed, and the recovered paint is removed. This is to prevent contamination of

Although the apparatus and method of the present invention are effective for attaining the respective objects, the actual configuration of the coating line differs depending on the object to be coated and the coating specifications. What is suitable for the line is required. As an example of an important problem, in a long painting booth in which the length in the transport direction is large, a cylindrical collecting trough, which is a replacement part used in the patent, becomes long, which makes replacement work difficult and increases Troughs are often installed in underground pits at the bottom of the booth, requiring extensive replacement pit space and increasing construction costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrostatic powder coating facility which handles paints of different colors and / or resins, and to connect the discharge port at the bottom of the paint booth. An object of the present invention is to provide a cleaning tool that does not require replacement of the collection trough and wet cleaning by dry-cleaning the inside of the cylindrical collection trough and the suction duct connecting the collection trough and the cyclone.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a cleaning tool for a cylindrical trough and a suction duct for collecting paint in an electrostatic powder coating booth which handles paint of different colors and / or resins. Cleans the inner surface by traveling between a cylindrical collecting trough that receives paint discharged from the outlet at the bottom of the painting booth and a suction duct that sucks paint from one end of the collecting trough and guides the paint to the cyclone. A cleaning tool comprising: a front and rear support member inscribed by three or more rollers on an inner wall of the collection trough or the suction duct; a connection shaft connecting the front and rear support members between centers; An annular mop or an annular brush that is rotated around the connection shaft by driving a motor around the connection shaft, and a nozzle ring that air blows the inner surface of the collection trough or the suction duct to the front support. By winding the wire rope sealed joint to the rear surface support is achieved by having a take-up device to return to the original position the cleaner body is advanced by the suction of the exhaust fan.

[0010] The object of the present invention is also that the connecting shaft is provided with a bendable joint having a degree of freedom for bending in two planes perpendicular to each other, and that the suction duct has a cyclone side. The terminal has a stopper for preventing the cleaning tool main body from dropping, and a removable rubber plate-like lid for covering the upper surface of the outlet at the bottom of the painting booth is placed during operation of the cleaning tool. This can be more effectively achieved by providing a disk on which a mop or an annular brush is mounted with an openable and closable window for adjusting a pressure difference before and after the cleaning tool.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cleaning tool according to the present invention is advanced by a negative pressure generated by an exhaust fan from a closed end of a collection trough to a terminal of a suction duct, and winds up a locked wire rope. Reciprocating reciprocating motion, meanwhile, the paint deposited on the inner wall is mechanically peeled off by the rotation of the attached annular mop or annular brush and the air blow from the nozzle ring and discharged together with the exhaust air flow, so that it is collected at the time of paint replacement This makes it possible to share troughs.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 shows the relationship between the cleaning tool according to the present invention and an electrostatic powder coating apparatus. FIG. 1 (A) is a side sectional view, and FIG. 1 (B) is a sectional view taken along line XX. is there. The workpiece 20 conveyed on the conveyor is coated with the charged powder coating by the electrostatic spray guns 22 and 22 ′ while passing through the coating booth 21. Then, the overspray paint that has not been applied to the work 20 is sucked from a discharge port 23 provided at the lower end of the inclined surface at the bottom of the booth into a cylindrical collecting trough 24 attached below the outlet. One end of the collection trough 24 at the time of painting is closed by a blind flange 241, and the other end is a suction duct 26 for suctioning by driving the exhaust fan 25.
The paint sucked into the collection trough 24 is sent to the cyclone 27 together with air. Cyclone 27
As disclosed in the above patent, the main body and the lower paint depositing section 28 can be detachably separated from each other, and the paint depositing section 28 and the collecting paint tank 29 are movable collection units for each paint. The air that has come out of the cyclone 27 and can be easily replaced is trapped by the bag filter 30 for the fine paint particles that could not be collected, and is exhausted from the outlet of the exhaust fan 25.

The cleaning tool 32 is used to clean the blind flange 24 during cleaning.
1 is set in a sleeve 33 to be removed and attached to that position, and is advanced in the collection trough 24 by a pressure difference between before and after caused by the operation of the exhaust fan 25, and further attached to the terminal through the bent suction duct 26. Stopper 34
To stop. Next, the wire rope 35 is returned to the original position by being wound on the winding drum 40.

FIG. 2 is a view for explaining the configuration of the cleaning tool 32 according to the present invention. FIG. 2 (A) is a side sectional view of the cleaning tool 32 during traveling, and FIG. 2 (B), FIG. C) and FIG. 2D respectively show LL and M- in FIG.
The M and NN arrow sectional drawing is shown. The cleaning tool body is a hollow member that connects between the centers of the support members 38 and 39 before and after being inscribed on the inner wall of the collection trough 24 or the suction duct 26 by at least three rollers (four are shown in the figure). As shown in detail in FIG. 3, a disk 43 that can freely rotate through a bearing 42 is mounted on the connection shaft 41, and an annular mop or an annular brush 44 is mounted on the outer periphery of the disk 43. Is installed. And the motor 45
Is transmitted by gears 46 and 47 to form an annular mop 44.
Is rotated to wipe the inner surface of the collection trough 24 or the suction duct 26. It should be noted that the transmission of the rotational motion can be performed by using a pulley and a belt.

The disk 43 is shown in FIG. 2 (D) and FIG.
As shown in FIG. 5, the fan-shaped window 431 has a two-piece structure, and the opening of the window 431 can be changed by rotating one of the windows. Thus, the pressure difference between the front and rear of the cleaning tool 32 is adjusted, and the advance speed of the cleaning tool 32 can be adjusted in advance.

A plurality of air nozzles 4 are provided on the front surface of the support 39.
A nozzle ring 49 in which the nozzle rings 49 are arranged in a row is attached.
Is blown from the air nozzle 48 toward the inner wall. After leaving the connecting shaft 41, the air hose may be bundled together with the wire rope 35 and the wiring of the motor 45 by a plurality of pairs of guide rollers 50 and wound around the winding drum 40, or may be wound alone. .

Next, as described above, the cleaning tool 32 is connected at right angles to the connecting shaft 41 at the center of the support members 38 and 39 on the front and rear surfaces. On the other hand, the absorption duct 26 usually has a bent portion in a plurality of planes due to the arrangement of the coating apparatus. Therefore, when the roller 37 is exactly in contact with the inner surface of the cylinder, the bent portion cannot pass. As a countermeasure for this, it is conceivable to make the bending radius of the suction duct 26 sufficiently large with respect to the length of the connecting shaft 41 or to arrange the rollers 37 inside the inscribed position of the cylinder. is there. In the present invention, the above problem can be solved by interposing a universal joint 51 having a degree of freedom for bending in two planes perpendicular to each other in the connecting shaft 41 as shown in FIG.

FIG. 4 is a view for explaining the function of the universal joint 51 interposed in the connecting shaft 41. FIG. 4 (A) is a partially cutaway plan view, and FIG. It is a partial notch cross-sectional side view. As shown in the figure, a pair of connecting plates 52 and 54 having pin holes
A ring 56 having a pin hole is inserted between them at a position rotated by 0 °, and pins 53 and 55 are inserted through the rings 56 from the pair of connecting plates 52 and 54. In this way, the left and right connecting shafts 41 can rotate in a horizontal plane and a vertical plane, so that the bent portion of the suction duct 26 can also run stably.

The forward speed of the cleaning tool 32 is based on the suction of the exhaust fan 25, and the pressure difference between the front and rear can be adjusted by opening the window 431 provided on the disk 43 as described above. However, as can be seen in FIG. 1, since the discharge port 23 is provided above the collecting trough 24, air flows in, so that the differential pressure naturally decreases, and the forward speed is lower than when traveling in the suction trough 26. Decrease. For this reason, when the inside of the booth 21 has been cleaned, it is preferable to prevent the inflow of air by laying a rubber plate 36 or the like on the discharge port 23 using the working gondola 31 to prevent the inflow of air.

[0020]

As described above, according to the cleaning tool of the present invention, it follows the suction duct having many bent portions, performs stable running and performs uniform wiping or brushing, and air blows to the inner wall. In combination with, complete cleaning can be done quickly with only dry cleaning. For this reason, it was not necessary to change the collection trough every time the paint was changed, so that the line stop time was shortened and the equipment itself was simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a relationship between a cleaning tool of the present invention and a coating apparatus.

FIG. 2 is a view for explaining a configuration of a cleaning tool according to the present invention.

FIG. 3 is a diagram showing details of a cleaning tool center part in FIG. 2;

FIG. 4 is a view for explaining a function of a universal joint interposed in a connection shaft in the present invention.

FIG. 5 is a plan view for explaining a schematic configuration of a conventional electrostatic powder coating line.

[Explanation of symbols]

 24 Collection Trough 25 Exhaust Fan 26 Suction Duct 27 Cyclone 32 Cleaning Tool 33 Sleeve 34 Stopper 35 Wire Rope 37 Roller 38, 39 Support 40 Winding Drum 41 Connection Shaft 42 Bearing 43 Disk 431 Window 44 Ring Mop or Ring Brush 51 Universal Joint

Claims (4)

[Claims] An inner surface of a collection trough that receives paint discharged from an outlet at the bottom of a coating booth and travels between a suction duct that sucks paint from one end of the collection trough and guides the paint to a cyclone. A cleaning tool for cleaning the collection trough or suction duct, a support member on the front and rear surfaces inscribed with three or more rollers on the inner wall of the suction duct, a connection shaft connecting the support members on the front and rear surfaces between centers, An annular mop or an annular brush which is provided between supports and rotates around the connecting shaft by driving a motor, a nozzle ring which air blows the inner surface of the collection trough or the suction duct to the front support, and the rear surface A winding device for winding the wire rope fixed to the support, and returning the cleaning tool body advanced by suction of the exhaust fan to the original position; and a collecting trough, Cleaning tool for suction duct. 2. The cleaning tool for a collection trough and a suction duct according to claim 1, wherein a flexible joint having a degree of freedom for bending in two planes perpendicular to each other is interposed on the connection shaft. . 3. A cleaning plate body is provided with a stopper at a cyclone side end of the suction duct to prevent the cleaning tool body from dropping, and a rubber plate-shaped cover for covering an upper surface of a discharge port at a bottom of the painting booth during operation of the cleaning tool. Claim 1 wherein a removable lid is placed.
The cleaning tool for the collection trough and the suction duct described in the above. 4. The collection trough and suction duct according to claim 1, wherein the disk on which the annular mop or the annular brush is mounted is provided with an openable / closable window for adjusting a pressure difference before and after the cleaning tool. Cleaning tools.