JP5591133B2 - Powder coating equipment - Google Patents

Description

  In this invention, a powder paint is sprayed from a coating gun so as to form a spray pattern that is long in the vertical direction, and the object to be coated is passed through the spray pattern that is long in the vertical direction to adhere the powder paint to the object to be coated. The present invention relates to a powder coating apparatus.

  Powder coating does not contain organic solvents, and overspray powder that has not adhered to the object to be coated can be collected and reused, so it has been adopted in many products in recent years as an environmentally friendly coating.

  It starts with road materials such as guardrails and lighting fixtures, and is often used for painting refrigerators, air conditioner outdoor units, school chairs and desks, and car parts such as wipers, coil springs, and license plates. . Recently, powder coating is also used for the top clear of the body.

  Even if the overspray powder that has not adhered to the object to be coated can be recovered and reused, reducing the amount of overspray powder to increase the coating efficiency is not only the use efficiency of the powder paint, It is important for reducing equipment such as the life of a dust collector, for example, a filter.

  In general, as shown in FIG. 9, the painting gun 1 is installed so as to be movable up and down by the reciprocator 2, and the coating gun 1 is moved up and down in accordance with the size of the object A to be coated. Spraying on the object A is performed.

  In addition, as shown in FIG. 10, a large number of branch nozzles 3 are installed in the vertical direction at the tip of the coating gun 1 to form a long spray pattern in the vertical direction so that efficient painting is performed. There are also many coating devices (Patent Document 1).

  When coating is performed with such a coating gun 1 having a spray pattern that is long in the vertical direction, if the vertical width of the spray pattern is too larger than the vertical dimension of the coating object A, the upper and lower ends of the coating object A The portion of the spray pattern that protrudes upward and downward becomes overspray powder, and so-called waste spray increases.

  Since various objects A of different sizes are sent to the powder coating line, the vertical width of the spray pattern is set to a length that covers the vertical dimension of the largest object A to be coated. Is done. For this reason, in the case of the object A to be coated having a small vertical dimension, a lot of waste blowing portions are generated in which the spray pattern protrudes from the vertical width of the object A to be coated.

JP 2010-269262 A

  By the way, for example, coil springs used for car shock absorbers are roughly divided into three types of lengths.

  When an object A having different vertical dimensions is hung on a hanger 5 that moves the transport rail 4 and passes through the coating booth 6, as shown in FIG. In order to reduce the work of attaching and detaching the object to be coated A, even if the vertical dimension of the object to be coated A changes, the hanger 5 has a common length, and the object A to be coated is the same as the hanger 5 It is often hung at the position and timing.

  In many cases, two objects A are hung side by side on one hanger 5, and the objects A are suspended so that their upper ends or lower ends have the same height, that is, different dimensions. Even in the case of the object to be coated A, the painting operation is performed so that either the upper end or the lower end of the object to be coated A when passing through the painting booth 6 is at the same height.

  For example, in FIG. 11, two types of coil springs having different lengths of the object A to be coated are suspended on the hanger 5 with their upper ends aligned and passed through the coating booth 6.

In this case, the width L ₁ of the spray pattern ejected from the large number of branch nozzles 3 provided in the cancer target spray gun 1 is set to match the vertical dimension of the longer coil spring.

  For this reason, when a coil spring having a short length is conveyed, a protruding portion is formed below the coil spring in the lower portion of the spray pattern, and the amount of waste blowing increases.

In this case, as shown by a broken line in FIG. 11, by rotating the spray gun 1, it is possible to narrow the width L ₂ of the upper and lower spray pattern.

However, as described above, by rotating with the spray gun 1 to the center of rotation, the width of the upper and lower spray pattern, is narrowed from L ₁ to L _2, blow waste spray pattern of the lower portion of the object to be coated A Although the amount is reduced, a portion where the spray pattern does not hit is generated in the upper portion of the article A to be coated, and the portion becomes unpainted. In addition, in FIG. 11, the code | symbol c has shown the rotation center of the spray pattern.

  In order to prevent such an unpainted portion from being generated, the coating gun 1 is rotated to narrow the vertical width of the spray pattern, the coating gun 1 is further lifted, the spray pattern is moved upward, and spraying is performed. Control must be performed so that the upper position of the pattern coincides with the upper end of the object to be coated A, and the control becomes very complicated.

  Accordingly, the present invention is directed to the vertical width of the spray pattern so that only one of the upper and lower ends of the spray pattern matches the upper and lower ends of the object to be coated, and the other end only matches the other end of the object to be coated. The present invention aims to reduce wasteful spraying of a powder coating material by providing a powder coating apparatus that can be adapted to objects to be coated having different sizes.

In order to solve the above-mentioned problems, the present invention sprays powder paint from a coating gun so as to form a spray pattern that is long in the vertical direction, and allows the object to be coated to pass through the spray pattern that is long in the vertical direction. In a powder coating device that attaches body paint to an object to be coated, it is equipped with a conveying device that conveys objects to be coated with different height dimensions so that the upper end position of the object to be coated is constant. When painting small objects, rotate the coating gun around the upper end position of the spray pattern that is long in the vertical direction, and raise the lower end position of the spray pattern that is long in the vertical direction to move the spray pattern in the vertical direction. a rotating device for narrowing the width, the upper and lower the spray pattern is formed by a large number of branch nozzles arranged vertically branches into multiple book from the tip of the spray gun, of the branch nozzles multiplicity of aligned vertically By increasing the installation density of the branch nozzle end, characterized in that to increase the density of the powder coating of the upper and lower end portions.

In addition, when the present invention is provided with a transport device that transports objects to be coated having different height dimensions so that the lower end position of the object to be coated is constant, the object to be coated having a small height dimension is coated. A rotating device that rotates the coating gun around the lower end position of the spray pattern long in the vertical direction and lowers the upper end position of the spray pattern long in the vertical direction to narrow the vertical width of the spray pattern. The spray pattern is formed by a large number of branch nozzles that are branched from the front end of the coating gun into a plurality of lines and arranged in the vertical direction. It is characterized by increasing the density and increasing the density of the powder coating on the upper and lower ends .

  The coating gun may be either a corona gun or a friction charging gun.

  As described above, the powder coating apparatus of the present invention changes the position of one of the upper and lower ends of the spray pattern by rotating the coating gun around one of the upper and lower ends of the spray pattern that is long in the vertical direction as the rotation center. Without doing so, the vertical width of the spray pattern can be narrowed by rotating the spray pattern.

  Therefore, when the objects to be coated of different sizes pass through the painting booth with the upper end position or the lower end position fixed, the width of the spray pattern of the powder coating is simply rotated. Since the vertical width of the spray pattern can be adapted to the objects to be coated having different sizes, the amount of waste spray can be reduced.

1 is a schematic diagram showing a first embodiment of the present invention. 1 is a perspective view of a first embodiment of the present invention in which a number of branch nozzles are arranged vertically. FIG. It is a perspective view of 1st Embodiment of this invention which shows the state rotated centering on the upper end of many branch nozzles. It is the schematic which shows 2nd Embodiment of this invention. It is a perspective view of a 2nd embodiment of this invention which arranged many branch nozzles perpendicularly. It is a perspective view of 2nd Embodiment of this invention which shows the state rotated centering on the lower end of many branch nozzles. It is the schematic which shows the coating gun of 3rd Embodiment of this invention. It is the schematic which shows the coating gun of 4th Embodiment of this invention. It is the schematic which shows an example of the conventional coating apparatus. It is the schematic which shows the example of the conventional coating gun. It is the schematic which shows an example of the conventional coating apparatus using the coating gun of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic view showing a first embodiment of the present invention.

  In the first embodiment, the object A to be coated is two types of coil springs having different lengths.

  Two types of coil springs, which are the object to be coated A, are passed through the coating booth 10 by the transport device 11 and are painted by the coating gun 12 during the passage.

  The transport device 11 includes a transport rail 13 and a hanger 14 that moves along the transport rail 13.

  The coating gun 12 has a large number of branch nozzles 15 arranged in the vertical direction at the tip of the gun, and the powder coating is applied to the object A to be coated with a spray pattern that is wide in the vertical direction from the large number of branch nozzles 15. Be injected.

  In the first embodiment, the coating gun 12 is a corona gun, but a frictional charging gun may be used.

  The width of the spray pattern sprayed from the coating gun 12 is set to a width that covers the length of the longer coil spring that is the object to be coated A in a state where a large number of branch nozzles 15 are arranged in the vertical direction. Yes.

  Two types of articles A having different lengths are suspended from the hanger 14 of the transport device 11. Two types of workpieces A having different lengths are hung on the same length of hanger 14, and the upper end position of the two types of workpieces A having different lengths is constant during the movement of the coating booth 10. It is arranged to be the height of.

  The coating gun 12 having a large number of branch nozzles 14 is supported by a support base 16 so as to be rotatable about the nozzle position at the upper end.

Then, when painting a coil spring having a short length, as shown by a broken line in FIG. 1, the coating gun 12 is rotated around the position of the uppermost branch nozzle 15 as the center of rotation, and the position of the lowermost branch nozzle 15 is detected. Is raised in the clockwise direction of the arrow 17 to narrow the spray pattern width so that the length of the short coil spring matches the width of the spray pattern so that no wasteful blow occurs. In FIG. 11, symbol c indicates the rotation center, L ₁ is a wide spray pattern in which the branch nozzles 15 are arranged in the vertical direction, and L ₂ is a narrow spray when the coating gun 12 is rotated. The pattern is shown.

  The intervals between the branch nozzles 15 of the coating gun 12 may be set at regular intervals. However, in the case of an object A to be coated such as a coil spring, the coil interval between the upper and lower ends is narrowed and sprayed to this portion. In order to increase the spray amount of the powder coating to be performed, the interval between the branch nozzles 15 may be made denser at the upper and lower ends than at the center.

  2 and 3 show a schematic configuration of a rotating device 18 that rotates the coating gun 12 having a number of branch nozzles 15 at the tip of the gun around the branch nozzle 15 at the upper end.

  The rotating device 18 includes a rotating shaft 21 that is rotatably supported by bearing columns 19 a and 19 b via bearings 20 a and 20 b, and the upper end of the coating gun 12 is branched to the tip of the rotating shaft 21 via a bracket 22. This is a device that supports the nozzle 15 and rotates a number of branch nozzles 15 arranged in the vertical direction as shown in FIG.

  The rotary shaft 21 is attached to the rod 24 of the air cylinder 23 by an arm 25 and is rotated by the expansion and contraction of the rod 24.

  The main body of the painting gun 12 is supported on the rotary shaft 21 via an attachment arm 26.

  The branch nozzles 15 arranged at the top and bottom of the tip of the painting gun 12 are inserted into the painting booth 10 through the opening 27 provided in the painting booth 10. The opening 27 provided in the painting booth 10 is formed in a fan shape in which the center of the fan is located at the upper end so that the branch nozzle 15 at the upper end of the branch nozzles 15 arranged vertically can be rotated. In order to prevent the powder paint from leaking out from the fan-shaped opening 27, the branch nozzle 15 at the tip of the coating gun 12 is provided with a fan-shaped opening 27 so that the fan-shaped opening 27 can be closed even if rotated. A shielding plate 28 having a double central angle is attached.

  By installing so that only the tip of the branch nozzle 15 protrudes from the shielding plate 28 into the coating booth 10, the branch nozzle 15 is less contaminated and the inner wall of the coating booth 10 can be easily cleaned.

  Although the air cylinder 23 is used as a member for rotating the rotating shaft 21, a rotary actuator or a motor driving device may be used.

  The coating gun 12 may be rotated automatically by detecting the height of the object A to be coated, or manually.

  As described above, when coating is performed by adjusting the width of the spray pattern from the coating gun 12 in accordance with the height of the object to be coated A to the height dimension of the object to be coated A, the coating gun A does not rotate and is vertical. The amount of powder paint used can be reduced by 30 to 40% compared to the case where coating is performed with the branch nozzles 15 arranged side by side.

Next, FIG. 3 is a schematic view of a painting line for bicycle parts, and shows a second embodiment of the present invention. The bicycle parts that are the objects to be coated A are the body frame A ₁ and the front fork A ₂ , and the body frame A ₁ has a longer vertical dimension than the front fork A ₂ .

The body frame A ₁ and the front fork A ₂ are supplied into the painting booth 10 by the transport device 11.

  As in the first embodiment, the transport device 11 includes a transport rail 13 and a hanger 14 that moves along the transport rail 13.

In this second embodiment, the lower end receiving metal 14a of the hanger 14, 14b is installed, the receiving metal 14a, a 14b, and supported so as to insert the lower end of the body frame _{A 1} before and Hawk _{A 2} cage, body frame a ₁ before and fork a ₂ is a painting booth 10 so as to move aligned the lower end position at the same height.

Also in the second embodiment, the coating gun 12 has a large number of branch nozzles 15 at the top and bottom, and a large number of branch nozzles 15 are arranged vertically in the vertical direction to form a wide spray pattern. and its width is the dimension in the vertical direction is in accordance with the long body frame a _1.

  In this second embodiment, the coating gun 12 having a large number of branch nozzles 15 is supported by a support base 16 so as to be rotatable about the branch nozzle 15 at the lower end. Symbol c indicates the rotation center.

Then, when painting the front fork A ₂ having a short length, as shown by a broken line in FIG. 4, the coating gun 12 is moved in the counterclockwise direction indicated by the arrow 29 with the position of the branch nozzle 15 at the lower end as the rotation center. rotate, lowers the position of the branch nozzle 15 at the upper end, by narrowing the width of the spray pattern, and short previous Hawk a ₂ of length to match the width of the spray pattern, wasteful blow occurs I am trying not to.

  5 and 6 show a schematic configuration of a rotating device 18 that rotates the coating gun 12 having a number of branch nozzles 15 at the tip of the gun around the branch nozzle 15 at the lower end.

  The rotation device 18 of the second embodiment is basically the same as the rotation mechanism except that the rotation center is the branch nozzle 15 at the lower end, and the rotation mechanism is basically the same. The same reference numerals are used for explanation.

  The rotating device 18 includes a rotating shaft 21 that is rotatably supported by support frames 19a and 19b via bearings 20a and 20b, and a branch at the lower end of the coating gun 12 is connected to a tip of the rotating shaft 21 via a bracket 22. As shown in FIG. 5 and FIG. 6, a device that supports the nozzle 15 and rotates a plurality of branch nozzles 15 arranged in the vertical direction around the rotation center of the branch nozzle 15 at the lower end by rotation of the rotary shaft 21.

  The rotary shaft 21 is attached to the rod 24 of the air cylinder 23 by an arm 25 and is rotated by the expansion and contraction of the rod 24.

  The main body of the painting gun 12 is supported on the rotary shaft 21 via an attachment arm 26.

  The branch nozzles 15 arranged at the top and bottom of the tip of the painting gun 12 are inserted into the painting booth 10 through the opening 27 provided in the painting booth 10. The opening 27 provided in the coating booth 10 is formed in a fan shape in which the center of the fan is located at the lower end so that the branch nozzle 15 at the lower end of the branch nozzles 15 arranged vertically can be rotated. In order to prevent the powder paint from leaking out from the fan-shaped opening 27, the branch nozzle 15 at the tip of the coating gun 12 is provided with a fan-shaped opening 27 so that the fan-shaped opening 27 can be closed even if rotated. A shielding plate 28 having a double central angle is attached.

  By installing so that only the tip of the branch nozzle 15 protrudes from the shielding plate 28 into the coating booth 10, the branch nozzle 15 is less contaminated and the inner wall of the coating booth 10 can be easily cleaned.

  The second embodiment is a device for performing painting by arranging the objects A to be coated such that the height of the lower end is constant, and also when painting the object A having a shape like a fuel tank of a motorcycle. Is suitable. In other words, in the case of an object A to be painted like a fuel tank of a motorcycle, in order to paint the upper surface of the tank neatly, it is necessary to install the spray pattern so that the spray pattern protrudes above the height of the object A. preferable. Therefore, in order to paint such an object A, the second embodiment in which painting is performed such that the height of the lower end is fixed is desirable.

  Next, in the above-described embodiment, the main body of the coating gun 12 is provided at an intermediate position between a large number of nozzles arranged vertically. As shown in FIGS. When the multiple branch nozzles 15 are arranged at the upper end or the lower end of the multiple branch nozzles 15 so that the multiple branch nozzles 15 are lined downward or upward from the position, the coating gun 12 is rotated about the main body of the coating gun 12. However, it can be rotated around the branch nozzle 15 at the upper end or the lower end.

  The third embodiment in FIG. 7 is an example having the upper branch nozzle 15 as the rotation center, and the fourth embodiment in FIG. 8 is an example having the lower branch nozzle 15 as the rotation center.

A Object 10 Coating booth 11 Transport device 12 Coating gun 13 Transport rail 14 Hanger 15 Branch nozzle 16 Supporting stand 18 Rotating device 19a, 19b Support frame 20a, 20b Bearing 21 Rotating shaft 22 Bracket 23 Air cylinder 24 Rod 25 Arm 26 Mounting Arm 27 Opening 28 Shielding plate

Claims (4)

The powder paint is sprayed from the coating gun so as to form a spray pattern that is long in the vertical direction, and the object to be coated is conveyed so as to pass through the spray pattern that is long in the vertical direction so that the powder paint adheres to the object to be coated. A powder coating machine is equipped with a transport device that transports objects to be coated with different height dimensions so that the upper end position of the object to be coated is constant. A rotating device that rotates the coating gun around the upper end position of the spray pattern long in the vertical direction and raises the lower end position of the spray pattern long in the vertical direction to narrow the vertical width of the spray pattern , The spray pattern is formed by a large number of branch nozzles that are branched from the tip of the coating gun into a plurality of lines and arranged in the vertical direction. The Increase, powder coating apparatus being characterized in that to increase the density of the powder coating material of the upper and lower end portions. The powder paint is sprayed from the coating gun so as to form a spray pattern that is long in the vertical direction, and the object to be coated is conveyed so as to pass through the spray pattern that is long in the vertical direction so that the powder paint adheres to the object to be coated. In powder coating equipment, a coating device that transports objects to be coated with different height dimensions so that the lower end position of the object to be coated is uniform is provided. the lower end position of the long spray pattern in the vertical direction in the center of rotation to rotate the spray gun, comprising a rotating device is lowered to the upper end position of the long spray pattern in the vertical direction narrow the vertical width of the spray pattern, the The spray pattern is formed by a large number of branch nozzles that are branched from the tip of the coating gun into a plurality of lines and arranged in the vertical direction. The Increase, powder coating apparatus being characterized in that to increase the density of the powder coating material of the upper and lower end portions.   The powder coating apparatus according to claim 1 or 2, wherein the coating gun is a corona gun.   The powder coating apparatus according to claim 1 or 2, wherein the coating gun is a frictional charging type gun.

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