JPS6168166A - Coating method - Google Patents

Abstract

PURPOSE:To remove quickly the remaining floated paint mist in case of the replacement of the material to be coated by increasing the blow-off feeding quantity and the discharging quantity of the ventilation gas. CONSTITUTION:In the replacing process till the point of time wherein the next material to be coated is reached to the coating operation position from the point of time wherein the coating of the material A to be coated has been finished, the blow-off feeding quantity and the discharging quantity of the ventilation gas are respectively increased in comparison with the spray coating process. By this method, the remaining floating paint mists being the cause of color migration are quickly removed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of sequentially spray painting the bodies of automobiles, casings of home appliances, etc. while continuously conveying them. Objects to be painted are sequentially brought into and out of the painting area using a conveying device, and excess spray paint mist is quickly removed from the painting work area using a gas flow that blows and supplies ventilation gas for removing paint mist downward from the upper part of the work area. Concerning painting methods to be excluded.

[Conventional technology]

Conventionally, in the above-mentioned painting method, the same amount of ventilation gas and exhaust gas as during the painting work are supplied not only during the painting work, but also when replacing the object to be painted in the painting work area. This is done continuously, and by removing residual floating mist through continuous ventilation, it is possible to prevent so-called color transfer, where the paint mist generated in the previous painting adheres to the next object to be painted with a different color. (No references are available.) [Problem to be solved by the invention] However, compared to ventilation during painting operations, which roughly removes a large amount of excess spray paint mist.

The purpose of ventilation when changing objects to be coated requires almost complete removal of even a small amount of residual floating mist, so at the time of changing objects, it is necessary to supply the same amount of ventilation gas as during painting work, and If the exhaust is simply continued, it will take a considerable amount of time to reach a condition that is sufficient to prevent color transfer, and as a result, the pitch at which the objects to be painted are brought in must be increased due to time constraints. ◇ The purpose of the present invention is to improve the efficiency of continuous painting work by performing ventilation operation in a valley manner. The purpose is to achieve this while reliably preventing color transfer between objects and avoiding waste of ventilation power.

[Means for solving problems]

The characteristic means of the coating method according to the present invention is that ventilation gas is blown downward from the upper part of the painting work area from the time when the painting work on the object to be painted is completed until the next object to be painted reaches the painting work position. The purpose is to increase the amount of blowing supply and the amount of ventilation gas discharged from the bottom of the work area compared to during painting work, and its functions and effects are as follows.

[Effect]

In other words, when replacing the object to be coated, the ventilation gas must be blown out! By increasing the rk and exhaust volume, the ability to remove paint mist due to the flow of ventilation gas in the area is greater than during painting operations, thereby quickly removing residual floating paint mist that is the cause of color transfer9. be.

〔Effect of the invention〕

As a result, compared to simply continuing to supply and exhaust ventilation gas in the same amount as during painting work, the workpieces to be painted can be brought in at short intervals while reliably preventing color transfer. As a result, the overall continuous painting work efficiency was greatly improved.

By the way, in order to prevent one color transfer and improve work efficiency,
It may be possible to increase the supply of ventilation gas and the exhaust machine throughout the entire process from painting to loading and unloading, but in that case, an unnecessary large amount of dust would be blown out during the painting process. Additionally, exhaustion is performed, which leads to the problem of wasting ventilation power.

Point 1: According to the present invention, the supply amount and exhaust amount of ventilation gas are increased only when replacing the object to be coated, which requires complete removal of residual floating mist, so that ventilation power is not wasted. None.

It is possible to avoid wasted operating costs and is also advantageous in terms of energy saving.

〔Example〕

gt diagram and Figure 2 show the painting booth used for continuous painting, +l) I/'i, spray painting work area in the booth (2)
(3) is an air supply fan that blows ventilation gas downward from the ceiling (for two people); (4) is a conveyor for carrying in and out of the painting work area (2) one by one the objects to be painted tAl placed on the trolley (6).

(6) is a device that removes paint mist from exhaust gas by forcibly bringing the exhaust gas into contact with water; (7) is a device that is located at a predetermined painting work position or moves (A) to that location; (8) is a painting robot that automatically spray-paints the object to be painted (IAI) in the work area; The present invention is an automatic control device that causes the conveyor (4) and the painting robot (7) to operate in conjunction with each other based on a preset program.

When performing ventilation operation to remove paint mist in the painting booth, the automatic control device (
In the continuous coating process carried out in step 8), in the steps (11 to 11) of spray painting the object (A) that is at the painting work position or is moving, the ceiling part (2 The amount of ventilation gas blown out from the person (person) and the amount of exhaust gas (V') from the floor are continuously maintained at preset amounts, respectively, and at the time when the painting of the object to be coated (2) is completed ( The process of changing the object to be painted (
t, ~ts), the blowout supply amount M and the exhaust amount (V') are each set for a predetermined time (4 meals) than during the spray painting process (meal 1 ~). amount (Δv).

(4′), said air supply fan Tl)
The rotational speed of each of the exhaust fans (3) is then automatically controlled by the automatic control device (8) based on the aforementioned setting program.

In other words, when replacing the object to be coated (2), the supply amount M and the exhaust amount C%A of ventilation gas are automatically increased,
By increasing the ability to remove paint permeation through ventilation gas flow compared to during painting operations, residual floating paint mist, which causes color transfer, can be quickly removed to improve work efficiency.

[Another example]

The amount of ventilation gas to be blown out and the rate of increase in the amount of exhaust gas can be changed as appropriate.

To change the supply amount and exhaust amount of ventilation gas,
Instead of controlling the rotational speed of the fans 11 and 31 as described above, various types of control can be applied, such as controlling the number of fans or controlling the production of variable blade axial fans.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front sectional view of a painting booth, FIG. 2 is a side sectional view of the same, and FIG. 3 is a graph showing the ventilation shape m. (2)...Painting work area, (4)...Transfer device, prisoner...Object to be painted, M...Blowout supply M! Quantity, quality...displacement. Agent Patent Attorney Shudai Kitamura 1511 1g211 1K 3 Figure

Claims (1)

[Scope of Claims] [1] The objects to be painted (A) are sequentially carried in and out of the painting work area (2) of the spray painting booth by a conveying device (4), and the paint is applied from the upper part of the work area (2). A coating method in which ventilation gas for mist removal is blown downward and supplied, and ventilation gas within the area is exhausted from the bottom of the work area (2), and the method includes: A painting method in which the supply amount (V) and the exhaust amount (V') of the ventilation gas are increased until the object to be painted (A) reaches the painting work position compared to during the painting work. [2] Claim No. 1 in which the supply amount (V) and exhaust amount (V') of the ventilation gas are automatically changed in conjunction with automatic conveyance by the conveyance device (4). Painting method described in section.