JPH0412193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention rotates a rotating electrode that forms an electrostatic field between it and an object to be coated, and the liquid paint supplied to the rotating electrode is discharged through a discharge hole by centrifugal force. The present invention relates to an electrostatic coating device that emits light from a source, atomizes it under the action of an electrostatic field, and applies the atomized material to an object to be coated.

Prior Art and Problems to be Solved by the Invention In general, the electrostatic coating device described above has an internal space in which the rotating electrode is open at the rear, into which the supply port of the liquid supply pipe is inserted from the rear. However, when liquid paint is dropped from the supply port onto the tapered inner peripheral surface, the paint flows as a thin film due to centrifugal force, reaches the discharge hole, and is discharged from there. When using a two-component type synthetic resin paint, in which two types of liquids, such as a main liquid or a curing liquid, such as a polyurethane-based liquid or a curing liquid, are mixed immediately before applying to the object to be coated, two liquids are installed in the internal space. Even if you insert a liquid supply pipe and drop a different liquid directly onto the inner circumferential surface from each supply port to mix it on the surface, the liquid will be released from the discharge hole without being sufficiently mixed. Because of this problem, there has been a desire for a coating device that can sufficiently mix multiple types of liquids dropped within a rotating electrode.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention fixes a circular rotating electrode formed with a discharge hole extending toward the outer periphery from an internal space with an open rear surface to a rotating drive shaft. , a porous material having a large number of continuous gaps is fixed to the inner periphery of the rotating electrode, and each supply port of two or more liquid supply pipes faces into the inner space, and each supply Two or more liquids dropped from the spout are soaked into the porous material and mixed, and then released from the discharge hole by centrifugal force and applied to the object by the action of an electrostatic field.

Functions and Effects of the Invention The present invention has the above configuration, and two or more types of liquids dripped from each supply port onto the inner periphery of the porous material proceed toward the outer periphery through the gap formed therein by centrifugal force. During the process, it mixes with other liquids, mixes well, oozes out from the porous material, reaches the discharge hole and is released, and is atomized by the action of centrifugal force and electrostatic field and applied to the object to be coated. The different liquids dripped from each supply port are thoroughly mixed while passing through the gaps in the porous material. There is an effect that the above liquid paint can be evenly mixed immediately before being applied to the object to be coated.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

The electrostatic coating device of this embodiment has a rotary drive shaft 1 driven by a drive device (not shown) such as an air motor.
A rotary electrode 2, which is made up of an atomizing tube 3 fitted and fixed onto a mounting body 4, is attached to the tip of the electrode so that the rotating electrode 2 can rotate integrally by fixing the mounting body 4 with a socket bolt 5. , the atomizing cylinder 3 of this rotating electrode 2 protrudes in a cylindrical shape in front of the mounting body 4,
The inner circumferential surface thereof is formed with a tapered inclined surface 6 whose diameter increases toward the front edge, and the mounting body 4 has an internal surface whose rear surface is open and whose inner circumferential surface 8 is tapered to widen inward. A space 7 is formed, and a plurality of discharge holes 9 facing the inclined surface 6 of the atomization tube 3 are transparently provided at the front end of the inner peripheral surface 8 of the space 7, and a sponge 10 having a large number of continuous pores is formed. is fitted around the entire circumference so as to close the discharge hole 9, and in the internal space 7 of the mounting body 4, the supply ports 12, 12 at the tips of the two liquid supply pipes 11, 11 are inserted from the rear. An isocyanate group (-NCO) that is mixed to form a polyurethane resin paint is inserted into each liquid supply pipe 11.
Two types of liquids are supplied, such as a crosslinking component liquid having an OH group and a polyester liquid having an OH group.

Next, the operation of this embodiment will be explained.

The rotating electrode 2 is directed toward an object to be painted (not shown), and is connected to a high voltage generator (not shown) via the rotational drive shaft 1 to form a high potential electrostatic field between the rotating electrode 2 and the object to be painted. Rotating electrode 2 by driving
2 from each supply port 12 while rotating at high speed.
When different types of liquids are dropped at a predetermined ratio, both liquids fall separately onto the sponge 10, penetrate into the interior through the gaps in the sponge 10 due to capillary action, and merge with each other. While passing through the sponge 10, the mixed liquid that has been evenly and sufficiently mixed oozes out from the outer periphery of the sponge 10 and from the discharge hole 9. The spray is sprayed onto the inclined surface 6 of the atomizing tube 3 by centrifugal force, and the centrifugal force forms a thin film on the inclined surface 6 and sends it to the front edge. The liquid is ejected forward, and is applied to an object (not shown) by electrostatic attraction.

In this example, the sponge 10 was used to mix the two types of liquids, but instead of this, porous ceramics with continuous pores, powdered sintered metal, fine wire mesh, fiber,
Cloth or the like may also be used.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional view thereof, and FIG. 2 being a partially cutaway front view thereof. 1: Rotating drive shaft, 2: Rotating electrode, 7: Internal space, 9: Release hole, 10: Sponge (porous material),
11: Liquid supply pipe, 12: Supply port.

Claims (1)

[Claims] 1. A circular rotating electrode with a discharge hole extending from an inner space opening toward the outer periphery is fixed to a rotating drive shaft, and a porous material having a large number of continuous gaps is completely covered with the inner periphery of the rotating electrode. The porous material is fixed to the porous material so that each supply port of two or more liquid supply pipes faces into the internal space, and the two or more liquids dripped from the respective supply ports are soaked into the porous material and mixed. An electrostatic coating device characterized in that the electrostatic coating device is characterized in that the coating material is subsequently discharged from the discharge hole by centrifugal force and coated on the object to be coated by the action of an electrostatic field.