JPH04176353A - Coating equipment - Google Patents

Abstract

PURPOSE:To prevent the sticking of a coating material to parts to be subjected to prevention of coating material sticking by providing discharge electrodes to electrify the particles of the sprayed coating material and disposing capturing electrodes which form static electric fields with the discharge electrodes and electrically capture the electrified coating material particles. CONSTITUTION:The capturing electrodes 11 are grounded and a negative voltage -V enough to generate a corona discharge is impressed to the discharge electrodes 12 by a power source device 13. Among the coating material particles T to be sprayed to a material 1 to be coated, the particles arriving at the neighborhood of side walls i0 without depositing on this material 1 are electrified by the corona discharge at the discharge electrodes 12. These electrified coating material particles Te are captured to the capturing electrode 11 side by directing the static electric fields E formed between the discharge electrodes 12 and the capturing electrodes 11 toward the capturing electrodes 11 to cause electrophoresis. The adhesion of the coating material to the side walls 10 and a window 14 formed thereon is prevented in this way. The cleaning of the coating work area is effectively attained at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to coating equipment for spray painting objects to be coated.

[Conventional technology]

In spray painting, if the spray paint on the object to be painted is left unattended on parts other than the object to be painted, such as walls and windows in the painting booth, the adhering paint will peel off and scatter after drying, causing damage to the object. Conventionally, there is no effective way to prevent spray paint from adhering to walls, windows, etc., and when paint adhesion has progressed to a certain extent. The reality is that cleaning work is carried out to remove adhering paint, and that films are pasted on areas to be prevented from adhesion, such as walls and windows, and the films are replaced in a timely manner.

[Invention or problem to be solved]

However, even with the above-mentioned removal and cleaning work for adhering paint,
Further, even with the method of attaching a film, there is a problem in that cleaning work and film replacement work must be carried out frequently, which requires a great deal of labor and expense.

Moreover, since the painting work must be interrupted during cleaning work and film replacement work, there is a problem in that the performance of the painting work deteriorates.

An object of the present invention is to effectively solve the above-mentioned problem of paint adhesion through a rational device configuration.

[Means to solve the problem]

A first feature of the coating equipment according to the present invention is that a discharge electrode is provided to charge sprayed paint particles, and a collection electrode is provided to form an electrostatic field with the discharge electrode to electrically collect the charged paint particles. is placed near the part to be prevented from adhesion of paint, and its functions and effects are as follows.

[For production]

In other words, according to the first characteristic configuration described above, charged paint particles are electrophoresed in the electrostatic field formed between the discharge electrode and the collection electrode, and are disposed near the part to be prevented from adhesion of paint. By being collected by the collecting electrode, paint is prevented from adhering to the target area.

[Effects of the Invention] As described above, by being able to prevent paint from adhering to the parts to be prevented from adhering to paint, there is no longer a need for frequent removal and cleaning work for adhering paint or film replacement work, which was required in the past, and maintenance labor and costs can be reduced. We have been able to save a lot of money.

In addition, it is possible to prevent paint adhesion itself, which causes deterioration in paint quality due to peeling and scattering after drying, and promotes improvement in paint quality.Furthermore, it is possible to prevent paint from adhering to the paint itself, which causes deterioration in paint quality due to peeling and scattering after drying. By being able to avoid
It has also been possible to improve the performance of painting operations.

Furthermore, since it prevents paint from adhering to the target part by collecting paint particles, for example, it is possible to prevent charged paint particles from approaching the target part by using electrical repulsion. In addition to preventing paint from adhering to the area to be prevented, it is also possible to prevent paint particles from dissipating to other areas, making it possible to more effectively and highly purify the painting work area.

[Second and Third Features of the Present Invention] A second feature of the coating equipment according to the present invention is that it is provided with a cleaning means for washing away collected paint particles by supplying a cleaning liquid to the collection electrode.

In other words, if this second characteristic configuration is adopted, it is possible to prevent paint particles from adhering and depositing on the collection electrode by washing with the cleaning liquid, and the paint particle collection function of the collection electrode can be maintained at a high level at all times.

A third feature of the coating equipment according to the present invention is that a power supply means for applying a voltage of the same polarity as the charged paint particles to the part to be prevented from adhesion is provided.

In other words, if this third characteristic configuration is adopted, the electrical repulsion between the charged paint particles and the part to be prevented from adhesion to which a voltage of the same polarity as the charged paint particles is applied will prevent the paint from adhering to the part to be prevented from adhesion. Not only can this be achieved more reliably, but also the collection of paint particles by the collection electrode placed near the area to be prevented from adhesion of paint can be assisted and promoted.

〔Example〕

Next, an example will be described.

Figures 1 and 2 show a painting booth, where (1) shows the object to be coated being transported by a transport device (2), and (3) shows the object to be painted (1) being spray-painted by a spray gun (4). Painting robot, (5) is a ceiling outlet that supplies ventilation air to the painting work area (6), (A) is the painting work area (6)
) is a lattice floor that allows exhaust air to flow downwards.

A cleaning water pan (8) is provided below the grid floor (7), and exhaust air (A) containing paint particles from the painting work area (6) is collected from the cleaning water pan (8). Washing water (W
The exhaust air (A) is made to pass through the bent constriction flow path (9) at high speed in a state of confluence with a), and during the passage process, the paint particles in the exhaust air (A) are captured by the cleaning water (Wa). This is to purify the body.

In the painting work area (6), a rod-shaped collection electrode (11) and a discharge electrode (12) are arranged near each side wall (1o), covering almost the entire height of the painting work area (6). , as shown in FIG. 3, a plurality of collection electrodes (11) are arranged in parallel at a predetermined pitch (d2) in the direction along the side wall (10) at a predetermined distance (dl) from the side wall (lO). The electrode (12) is arranged at a predetermined pitch (d2) in the direction along the side wall (10) at a predetermined distance (d3) further inward than the collection electrode (11).
), and a plurality of them are arranged in a staggered arrangement relationship with the collection electrode (11).

The collection electrode (11) is connected to earth;
A negative voltage (~V) sufficient to cause corona discharge is applied to the discharge electrode (12) by the power supply device (13).

In other words, the spray paint particles (T) on the object to be painted (1)
Among them, those that reach the vicinity of the side wall (10) without being coated on the object to be coated (1) are charged by corona discharge at the discharge electrode (12), and the charged paint particles (Te) are discharged. Electrode (1
2) and the collection electrode (11).
) is electrophoresed toward the collection electrode (11) and collected on the collection electrode (11) side, thereby preventing paint from adhering to the side wall (10) and the window (I4) formed therein. It is.

Washing water (Wb) is supplied to the collecting electrode (11) at the upper end of the collecting electrode (11), and the washing water (Wb) forms a water film over the entire circumference of the rod-shaped collecting electrode (11). collection electrode (1
1) is equipped with a washing water supply tank (15) that flows down along the collecting electrode (1).
By washing away the charged paint particles (Te) collected by 1) and preventing the paint from adhering and depositing on the collection electrode (II), the electrical collection function of the collection electrode (11) is maintained at a high level. It's Nishide.

Further, the washing water (Wb) falling from the collecting electrode (11) is stopped by an overflow gutter (16) that supplies the washing water (Wa) to the washing water lowering pan (8).

On the other hand, the side wall (12) is further inward than the row of discharge electrodes (12).
A light emitter (17a) whose optical path (L) is along the direction 0)
and a light receiver (17b) are arranged at the front and rear ends of the painting work area (6), and the voltage application to the discharge electrode (12) is stopped when the light receiver (17b) is not receiving light. A circuit (18) is provided to ensure safety against workers in the area accidentally approaching the discharge electrode (I2).

(19) is an overcurrent safety circuit that stops the voltage application to the discharge electrode (12) when the current value to the discharge electrode (12) exceeds the set upper limit value, thereby preventing spark discharge that may cause a fire in the booth. It's for safety.

Each of the above values (di), (d2), (d3), (-V
) as an example: d + =500 mm, d2: 150 mm.

d　s　=150mm.

-V=-10kv.

can be mentioned.

[Another example]

Next, another example will be listed.

(1) In the above embodiment, the side wall (lO) and the window (14) in the painting booth were the parts to be prevented from adhesion of paint, but the parts to be prevented from adhesion of paint may be of any kind, for example, the side wall (10) ) and windows (14), as well as lattice floors (
7) or the painting robot (3) may be used as parts to be prevented from adhesion of paint.

(2) The specific arrangement, shape, and structure of the discharge electrode (12) and the collection electrode (11) disposed near the part to be prevented from adhesion of paint can be modified in various configurations. As shown in FIG. 4, two rows of collection electrodes (11) may be provided, and a row of discharge electrodes (12) may be arranged between these rows of collection electrodes (II).

(3) The paint particles (T) floating in the painting work area (6) are slow and will not collide with the discharge electrode (12) due to inertia and will not adhere to the discharge electrode (12). In the example, the supply of the cleaning liquid (Wb) for washing away paint particles to the discharge electrode (12) was omitted, but in some cases, the cleaning means (15) by supplying the cleaning liquid to the discharge electrode (12) may also be used.
may be adopted.

Cleaning liquid (W) for the collection electrode (11) and discharge electrode (12)
b) The specific structure of the cleaning means (15) for washing away paint particles by supplying the cleaning means (15) can be modified in various ways, and is not limited to the liquid flowing type as in the above-mentioned embodiments.

Further, the cleaning liquid (Wb) used is not limited to water, and various liquids can be used.

(4) Instead of applying a negative voltage (-V) to the discharge electrode (12), a positive voltage (+V) may be applied, and instead of connecting the collection electrode (11) to earth, Collection electrode (11
) may be applied with a voltage of opposite polarity to the discharge electrode (12).

(5) In the case of electrostatic painting, the discharge electrode in the spray gun (4) is used to electrically capture paint particles to the collection electrode (11) near the target area (10) and (1, 4) to prevent paint adhesion. It may also be used as a corresponding discharge electrode (12) for collection.

(6) In addition to more reliably preventing paint from adhering to the paint adhesion prevention target parts (10) and (14), a collection electrode (11) placed near the paint adhesion prevention target parts (10) and (14) In order to assist and promote the collection of paint particles, a power supply device for the paint adhesion prevention target parts (10) and (14) is additionally equipped to apply voltage of the same polarity as the charged paint particles (Te) to the paint adhesion prevention target parts (10) and (14). You can.

(7) The present invention is applicable not only to coating equipment having a tunnel-shaped coating booth, but also to various types of coating equipment.

It should be noted that reference numerals are written in the claims for convenience of comparison with the drawings, and by such entry, the invention is not limited to the structure of the attached drawings.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, in which FIG. 1 is a front sectional view of a painting booth, FIG. 2 is a sectional view of the same from the top,
FIG. 3 is an enlarged plan view sectional view for explaining the collection form. FIG. 4 is an enlarged plan view sectional view of a painting booth showing another embodiment of the present invention. (11)... Collection electrode, (12)...
Discharge electrode, (10), (14)...Part to be prevented from adhesion of paint, (15)...Cleaning means, (T)...
・Paint particles, (Te)...Charged paint particles, (E
)...Static electric field.

Claims (1)

[Claims] 1. A discharge electrode (12
), and a collection electrode (11) that forms an electrostatic field (E) with the discharge electrode (12) to electrically collect charged paint particles (Te) is connected to the paint adhesion prevention target area ( 10), (14
) Painting equipment located near. 2. The coating equipment according to claim 1, further comprising a cleaning means (15) for washing away the collected paint particles (Te) by supplying a cleaning liquid to the collection electrode (11). 3. The coating equipment according to claim 1 or 2, further comprising a power supply means for applying a voltage of the same polarity as the charged paint particles (Te) to the parts (10) and (14) to be prevented from adhesion.