JPH07155651A - Electrostatic powder coater - Google Patents

Abstract

PURPOSE:To obtain an electrostatic powder coater which can automatically coat the whole of a heavy material having a complicated shape. CONSTITUTION:An electrostatic powder water is equipped with both a conveyance means for mount conveying the material 1 to be coated and an upside- coating gun 10a which blows electrostatic powder coating toward the material 1 to be coated. The conveyance means 2 is formed of a couple of conveyors 2a, 2b opposed through the gun space 5. An upward underside-coating gun 10b is provided in the gun space 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic powder coating apparatus for automatically coating the entire surface of an object to be coated, and particularly to an object having a complicated shape and a large weight such as a cylinder lock for an engine. The present invention relates to an electrostatic powder coating device capable of automatically coating a large amount of coating material.

[0002]

2. Description of the Related Art Conventionally, when electrostatic powder coating is applied to an object to be coated (work), the object to be coated is hung on a hanger of an overhead conveyor provided on the ceiling of a coating booth. However, this conveyor has the following problems. (1) In order to suspend a heavy object, for example, a 50 to 60 kg engine cylinder lock, a large chain and a hanger device are required, and the entire coating device becomes large. (2) It is troublesome to attach / detach the article to / from the hanger, and automation of the work is difficult. (3) Since it is difficult to separate the coating line and the baking line, it takes time and cost to process the paint that adheres to the hanger and is baked. Therefore, in order to solve the above-mentioned problem, a horizontal conveyor for placing an object to be coated on a conveyor and conveying it is used.

[0003]

However, when this horizontal conveyor is used, the lower surface of the article to be coated is covered with the belt conveyor, and therefore the lower surface cannot be coated.
Therefore, it is impossible to automatically coat the entire surface of the object to be coated.

In view of the above circumstances, an object of the present invention is to enable a heavy object having a complicated shape to be automatically coated on the entire surface.

[0005]

SUMMARY OF THE INVENTION The present invention comprises horizontal transfer means for placing and transferring an object to be coated, and an upper coating gun for blowing electrostatic powder paint toward the object to be coated. In the electrostatic powder coating apparatus, the horizontal transfer means is composed of a pair of conveyors facing each other through a gun space, and an upward lower coating gun is arranged in the gun space. The present invention is intended to achieve the above object by an electric powder coating apparatus.

[0006]

When the object to be coated is placed on the conveyor across the gun space, the upper surface of the object to be coated is coated with the electrostatic powder paint ejected from the upper coating gun, and the lower surface is coated with the lower coating gun. It is coated with electrostatic powder paint ejected from. Therefore, the entire surface of the object to be coated is automatically coated.

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. The transport means 2 is a device for placing and transporting the article 1 to be coated, and the device 2 is provided so as to penetrate the coating booth 3. The transfer means 2 is composed of a pair of conveyors 2a and 2b facing each other with a gun space 5 therebetween. The wall 3a of the coating booth 3 is made of a porous material, and the bottom 3b thereof is provided with an exhaust port 3c. The belt conveyors 2a and 2b are made of a conductive material. The conveyors 2a and 2b are stretched around pulleys 7 and 8, and the pulley 7 is grounded.

The width W of the gun space 5 is appropriately selected as required. The coating gun 10 discharges the electrostatic powder coating toward the article to be coated 1. The coating gun 10 includes an upper coating gun 10a disposed above the belt conveyor 2 and a lower side thereof in the gun space 5. It is composed of two lower coating guns 10b arranged in parallel upward. Both guns 10
a and 10b are respectively located on the same vertical plane V that is orthogonal to the traveling direction of the article to be coated 1, and the discharged paint is directed in the direction of covering the entire surface of the article to be coated 1 (direction of the center C).

Next, the operation of this embodiment will be described. An article to be coated, for example, an H-shaped cylinder cylinder 1 for engine of 50 to 60 kg is placed on the belt conveyors 2a and 2b so as to straddle the gun space 5. When the pulleys 7 and 8 rotate, the belt conveyor 2 moves in the direction of arrow A2,
It is conveyed into the coating booth 3 through the entrance 3A of the coating booth 3. Then, in the booth 3, the coating guns 10a, 10a
After being coated with the electrostatic powder coating material blown out from b, it is discharged from the outlet 3B of the coating booth 3, conveyed to a baking device (not shown) and baked.

At this time, the outer surface 1a of the article to be coated 1 is coated with the electrostatic powder paint discharged from the upper coating gun 10a, and
The lower surface 1b is coated with the electrostatic powder coating material discharged from the lower coating gun 10b. Further, the electrostatic powder coating material ejected from the upper coating gun 10a and the lower coating gun 10b scatters over the entire surface with respect to the vertical section V of the coating space 13, so that the end surface 1d of the article to be coated 1 is entirely covered. It is applied.

The electrostatic powder coating material applied from the coating guns 10a and 10b is applied to the article 1 to be coated, and most of the rest remains on the belt conveyors 2a and 2b. The overspray powder M attached to the belt conveyor is sucked and removed by the suction slit 15, collected by a collecting device (not shown), and reused as necessary.

Air G is introduced into the coating booth 3 through the porous wall portion 3a. The introduction of the air G prevents the overspray powder from adhering to the wall 3a.
The air flow is discharged to the exhaust port 3C through the gun space 5. The electrostatic powder paint carried on the air flow is
The end surface 1d and the lower surface 1b are washed with the surfaces 1b and 1d, and the unsprayed overspray powder M is sucked into the exhaust port 3C.

The embodiment of the present invention is not limited to the above. For example, as shown in FIG. 3, the horizontal conveying means are bar conveyors 22a and 22b, and the upper coating gun 20a and the lower coating gun 20b are covered. It may be inclined toward the center C of the coated article 21 and at a predetermined angle θ with respect to the traveling direction A2 of the article to be coated. The predetermined angle θ is appropriately selected depending on the shape of the object to be coated 21 and the like. In this embodiment, the electrostatic powder coating is ejected in an oblique direction with respect to the rear end face of the object to be coated 21. Therefore, as compared with the case where the electrostatic powder paint is ejected in parallel with the rear end face as in the above embodiment,
The coating efficiency can be improved.

[0014]

Since the present invention is constructed as described above, the upper side of the object to be coated can be surely coated with the upper coating gun, and the lower side thereof can be surely coated with the lower coating gun. Therefore, the entire surface of the object to be coated can be automatically and completely coated. Further, when the coating gun is inclined with respect to the traveling direction of the article to be coated, the front and rear end surfaces of the article to be coated can be more completely coated. Further, since the article to be coated is placed directly on the horizontal conveying means, the attachment / detachment to / from the conveying means or the transfer to the printing conveying device can be easily automated.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a view showing a second embodiment of the present invention and is a plan view corresponding to FIG.

[Explanation of symbols]

 1 coating object 2 belt conveyor 3 coating booth 5 gun space 10a upper coating gun 10b lower coating gun

Claims (8)

[Claims] 1. An electrostatic powder coating apparatus comprising: a horizontal transfer means for mounting and transferring an object to be coated; and an upper coating gun for spraying electrostatic powder paint toward the object to be coated, The electrostatic powder coating device, wherein the horizontal transfer means is composed of a pair of conveyors facing each other through a gun space, and an upward lower coating gun is disposed in the gun space. 2. The electrostatic powder coating apparatus according to claim 1, wherein the conveyor is a conductive belt conveyor. 3. The electrostatic powder coating apparatus according to claim 1, wherein the conveyor is a bar conveyor. 4. The electrostatic powder coating apparatus according to claim 1, wherein a plurality of lower coating guns are arranged. 5. The electrostatic powder coating according to claim 1, wherein the upper coating gun and the lower coating gun are respectively arranged on the same vertical plane orthogonal to the traveling direction of the object to be coated. apparatus. 6. The electrostatic powder coating apparatus according to claim 1, wherein the upper coating gun and the lower coating gun are inclined with respect to the traveling direction of the object to be coated. 7. The electrostatic powder coating apparatus according to claim 1, wherein the upper coating gun and the lower coating gun are arranged in a coating booth having a porous wall portion. 8. The electrostatic powder coating apparatus according to claim 7, wherein air flows into the coating booth through the porous wall portion.