JPH0470061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrostatic coating device for applying a surface treatment agent such as rust preventive oil or lubricant to both surfaces of a continuously conveyed strip-like plate.

[Conventional technology]

Conventional electrostatic coating equipment continuously conveys a steel plate, aluminum plate, copper plate, etc. formed into a strip and electrostatically applies a surface treatment agent such as anti-corrosion oil to both sides of the strip. There is a type in which an electrostatic applicator is installed in the chamber through which the strip-shaped plate is passed from both upper and lower sides (see Utility Model Application Publication No. 1983-5854), and a chamber in which the strip-shaped plate is passed vertically. A type in which electrostatic coating machines are installed inside the band-shaped plate body from both the left and right sides (Utility Model 61-
(Refer to Publication No. 40158).

[Problem that the invention seeks to solve]

However, in the former type, the droplets of surface treatment agent that are electrostatically atomized from an electrostatic applicator installed opposite to the top surface of the strip plate and adhere to the surface of the strip plate pass directly below. There was an unavoidable problem that the product would drip onto the body surface, resulting in poor application.

In addition, in the latter type, the surface of the electrostatic coating machine installed opposite to both the left and right sides of the strip plate, the high voltage cable connected to the electrostatic coating machine, the surface of the treatment agent supply hose, etc. Due to the influence of high pressure, droplets of the surface treatment agent falling parallel to the surface of the strip become coarse particles and are adsorbed onto the surface of the strip, resulting in poor coating. For this reason, in the latter type, a cylindrical cover is placed over the electrostatic applicator and piping such as cables and hoses to prevent the surface treatment agent from adhering to it, and also to prevent the surface treatment agent from adhering to the surface. It was troublesome to have to install an inclined plate to collect the droplets of the processing agent.
61-79663, 61-87553 and 62-113792).

Therefore, the present invention eliminates the possibility that droplets of a surface treatment agent that adheres to and drips on the surface of an electrostatic coating machine or piping connected thereto may drip or be adsorbed on the surface of a strip plate, resulting in poor coating. The purpose of the present invention is to provide an electrostatic coating device that is free of

[Means for solving problems]

To achieve this object, the present invention provides an electrostatic coating device that applies a surface treatment agent to both sides of a continuously conveyed strip, in which a strip that is conveyed in one direction is placed in a first chamber. A conveying line is formed such that the conveying line passes horizontally through a second chamber, then turns in the opposite direction and horizontally passes through a second chamber, and the conveying line is formed in each of the chambers. It is characterized in that an electrostatic coating machine is installed opposite the lower surface of the strip-shaped plate.

[Effect]

According to the present invention, first, a surface treatment agent is applied to one side of a strip plate by an electrostatic coating machine installed in a first chamber, and then a surface treatment agent is applied to one side of a strip plate by an electrostatic coating machine installed in a second chamber. The surface treatment agent is also applied to the other side of the belt-like plate by the machine, so that the surface-treating agent is applied to both sides of the belt-like plate.

At this time, the surface treatment agent adheres to the surface of the electrostatic applicator installed in each chamber and the piping connected to it, but the droplets of the surface treatment agent pass above the electrostatic applicator. Drops in the direction away from the strip-shaped plate body.

Therefore, droplets of the surface treatment agent adhering to the surface of the electrostatic applicator are reliably prevented from dripping onto the surface of the strip plate or being adsorbed as coarse particles.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

FIG. 1 is a front view showing an example of an electrostatic coating device according to the present invention, in which a strip plate 1 conveyed in the direction of arrow R passes through a first chamber 2 in a horizontal state, and then Guided by guide rollers 3 and 4, it turns in the direction of arrow L, which is opposite to the direction of arrow R,
A second chamber 5 connected above chamber 2
A conveyance line is formed which passes horizontally through the interior and is wound onto a winding roll 6.

Electrostatic applicators 7 and 8 are installed in each of the chambers 2 and 5, respectively, facing the lower surface of the strip plate 1 passing through the chambers.

Then, the tip of the band-shaped plate 1 is inserted from the carry-in port 2a of the first chamber 2 to the carry-out port 2b and placed over the guide rollers 3, 4, and then passed from the carry-in port 5a of the second chamber 5 to the carry-out port. 5b and connect it to the take-up roll 6.

In this state, the take-up roll 6 is rotated to start transporting the strip plate 1, and at the same time, the electrostatic coating machines 7 and 8 are started to apply a desired surface treatment agent such as rust preventive oil or lubricant. Electrostatic atomization.

As a result, first, the particles of the surface treatment agent electrostatically atomized by the electrostatic applicator 7 installed in the first chamber 2 are conveyed to the strip plate 1 in the direction of the arrow R.
The particles of the surface treatment agent applied to one side 1a of the strip plate 1 and then electrostatically atomized by the electrostatic coating machine 8 installed in the second chamber 5 are conveyed in the direction of the arrow L. It is applied to the ground 1b, and the strip plate 1
A surface treatment agent will be applied to both surfaces 1a and 1b.

At this time, the surface treatment agent adheres to the surfaces of the electrostatic coating machines 7 and 8 installed in each chamber 2 and 5 and the piping (not shown) connected thereto, but the liquid of the surface treatment agent is The drops fall in a direction away from the strip plate 1 passing above each electrostatic applicator 7 and 8, that is, in a downward direction.

Therefore, droplets of the surface treatment agent adhering to the surfaces of the electrostatic applicators 7 and 8 are reliably prevented from falling onto the surface of the strip plate 1 or becoming adsorbed as coarse particles. Ru.

In the above embodiment, a case has been described in which the first chamber 2 and the second chamber 5 are arranged vertically, but the present invention is not limited to this. For example, as shown in FIG. It may also be a case where it is provided.

Further, it is sufficient that the conveyance line of the strip plate 1 is horizontal only when passing through each chamber 2 and 5, as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, when applying a surface treatment agent to both sides of a strip plate, surface treatment droplets attached to the surface of the electrostatic coating machine and the piping connected thereto are removed. It has a very excellent effect in that it can reliably prevent coating defects due to droplets or adsorption on the surface of the strip-shaped plate.

[Brief explanation of drawings]

1 and 2 are front views showing embodiments of an electrostatic coating device according to the present invention, respectively. Explanation of the symbols: 1... Band-shaped plate body, 2... First chamber, 5... Second chamber, 7... Electrostatic coating machine, 8... Electrostatic coating machine.

Claims (1)

[Claims] 1. In an electrostatic coating device that applies a surface treatment agent to both sides of a strip-shaped plate that is continuously transported, the strip-shaped plate that is transported in one direction passes horizontally through the first chamber, and then is applied in the opposite direction. A conveyance line is formed so as to pass through the second chamber in a horizontal state, and an electrostatic charge line is formed in each of the chambers to face the lower surface of the strip-shaped plate passing through the chamber. An electrostatic coating device characterized by being equipped with a coating machine.