JPS5922677A - Spray room device for coating - Google Patents

Abstract

PURPOSE:To perform satisfactory spraying and to reduce wasteful consumption of power, by providing an air vent window which is opened and closed automatically by air flow generated by difference of wind velocity of feed air and exhaust air in the spray room of a spray room device. CONSTITUTION:When spraying of the body 8 of an ordinary automobile is in operation, wind velocity of air sent into a spray room 2 by an axial blower 3 and the wind velocity of air exhausted from the room 2 by a centrifugal blower 4 are set to about 0.5m/sec. When work is not done, the wind velocity of feed and exhaust air is set to about 0.2m/sec. In this case, by setting the wind velocity of feed and exhaust air to 0.2m/sec slowly, and making feed side slightly larger than exhaust side during the transitional period, an air vent window 5 is opened automatically by wind pressure generated by the difference, and excess air is discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to indoor equipment for painting spraying, and in particular, spraying is effective because it eliminates the difference in air volume between the supply air volume and the exhaust volume when the air volume of indoor air supply and exhaust is changed. Paint spraying is concerned with chamber equipment that allows the work to be carried out with less loss of power.

Conventionally, when spraying paint on the body of an automobile, etc., the body was continuously conveyed indoors by a conveyor, and the spraying work was carried out in a tunnel-like spraying area with an open entrance and exit. In this case, the air is blown into the room from one direction and exhausted from the other direction, and the air is blown into the room at a wind speed Q.
A fast air flow of about 5 m/sec was generated, and this air flow provided good spraying.

By the way, if the conveyor that transports the body is stopped, or the sprayer is not indoors due to break times or other reasons, there is no need to perform spraying work, so the air supply and exhaust air speed is 0. The speed may be reduced to about .2 m/sec.

However, in this way, when the air supply and exhaust air speed inside the room is changed from fast to slow, there is a difference in the air volume of the air supply and exhaust,
For example, if the air volume on the supply side is larger than the air volume on the exhaust side, the air blown into the room by the blower will flow in the direction of the entrance and exit of the room. Air was being exhausted to the outside, resulting in a large loss of power. On the other hand, if the air volume on the exhaust side is υ larger than the air volume on the supply side, there will be a negative pressure indoors during spraying, and air mixed with dirt from the outside will flow into the room, and during spraying, dirt will be removed from the body during work. There was an inconvenience that it would stick to the surface. Because of this situation, in the past, spraying was done by keeping the air supply and exhaust air at a high speed even when the indoor air supply and exhaust air speed was slow.
This resulted in a disadvantage of large power loss.

The present invention has been made in order to eliminate the drawbacks of the prior art described above, and its purpose is to introduce air into a chamber from one direction and exhaust it from the other direction in spraying for painting. The spraying for painting is carried out in indoor equipment, and by installing an air vent window in the room that automatically opens and closes with the amount of air generated due to the difference in air supply and exhaust air speed, the spraying work is not carried out. The purpose of blowing is to slow down the air supply and exhaust air speed in the room to prevent loss of power.

Another purpose is to reduce the loss of power by preventing a large amount of the air sent into the blowing room from being discharged from the entrance and exit of the blowing room. Another purpose is to prevent air mixed with dust from flowing into the room during a transient period when the air volume is changed, thereby ensuring that the spraying work is performed properly.

In short, the present invention is a painting spraying system in which air is fed into a room from one direction and discharged from the other direction, and the amount of air supplied and the amount of air discharged when the air volume of supply and exhaust is changed. The present invention is characterized in that a plurality of air vent windows that automatically open and close depending on the difference in air volume are provided on the side wall of the air blowing chamber.

The present invention will be explained below based on embodiments shown in the drawings. A painting spraying chamber apparatus 1 according to the present invention includes a spraying chamber 2, an axial blower 3 which is an example of a supply air blower, a centrifugal blower 4 which is an example of an exhaust blower, and an air vent window 5. It is equipped with

The spraying chamber 2 is formed in the shape of a tunnel, and as shown in FIG. 2, entry/exit gaps 2a are formed on both left and right sides. In the embodiment, a car body 8 is conveyed to the spraying chamber 2 by a conveyor 9, and the paint is sprayed onto the body.

The axial blower 3 is placed in the upper part of the chamber 2, and the axial blower blows air into the chamber 2. The centrifugal blower blows air inside the chamber 2 to the outside. A plurality of air vent windows 5 are hinged to the front and rear side walls 2b of the air chamber 2 by means of bottles 10.

The air vent window 5 is configured to automatically open and close based on the difference in air volume between the supply and exhaust air volume when the air volume of supply and exhaust air is changed.

The present invention is constructed as described above, and its operation will be explained below. When work is being carried out on the body 8 of a normal automobile, the blowing is performed by the axial blower 3 at the speed of the air blown into the chamber 2, and the centrifugal blower &4 blowing the air discharged from the chamber 2. Both wind speeds are 0.5
Set it to m/see. In addition, if the conveyor 9 that conveys the body 8 is stopped, during a break, or if the body 8 is not sprayed into the chamber 2 for some reason,
Set the air supply and exhaust air speed to about 0.2 m/see. In this case, as shown in Figure 3, the wind speed V (m/'8
ec), time T (m/see) is plotted on the horizontal axis, and it is assumed that by time υ and time T, the wind speeds of both the supply and exhaust air become 0.2 m/sec. The air supply wind speed V1 during this transient period is set to be slightly larger than the exhaust air speed V.

Then, the air vent window 5 is automatically opened by the wind pressure generated by the difference 2 between the supply air speed 1 and the exhaust air speed 2, and the excess air is exhausted to the outside. Excess air is discharged from the air vent window 5, but the amount is very small, and unlike conventional blowing, a large amount of air is not discharged from the entrance and exit of the chamber 2. Power loss can be reduced slightly. When spraying, inside room 2,
Since the supply air volume is larger than the exhaust volume, there is no negative pressure, and therefore air mixed with dirt from the outside does not flow into the spraying chamber 2, allowing for good spraying work. . Conversely, when the air supply and exhaust air speed is set to 0.2 m/sec, it is sufficient to similarly set the supply air volume to be larger than the exhaust volume. The operation is performed automatically and the actions described above are performed.

The present invention is constructed and operated as described above, and therefore, in the painting spraying, air is drawn into the chamber from one direction and air is discharged from the other direction. The indoor air blower is equipped with an air vent window that automatically opens and closes depending on the air volume generated by the difference in air speed between air supply and exhaust. This has the effect of slowing down the exhaust wind speed and preventing loss of power. In addition, blowing can prevent the air sent into the room from being discharged in large quantities from the entrance and exit of the room, reducing loss of power, and also in case of transient changes in air volume. Since the spraying does not allow air mixed with dust or the like to enter the room, a variety of excellent effects can be obtained, such as good spraying, which allows the work to be carried out.

[Brief explanation of drawings]

The drawings relate to embodiments of the present invention. Figure 1 is a vertical cross-sectional view of the room equipment for painting spraying, Figure 2 is a perspective view of the room equipment for painting spraying, and Figure 3 shows changing the air wind speed. FIG. 3 is a diagram showing changes in wind speed with respect to time in a transient case for air supply and exhaust, respectively. Reference numeral 1 designates a painting spraying chamber device, 2 a spraying chamber, 2b a side wall of the spraying chamber, and 5 an air vent window. Patent applicant Hino Motors Co., Ltd. Agent
Patent attorney Kazuo Uchida

Claims (1)

[Claims] Spraying is a system in which air is injected into the room from one direction and exhausted from the other. Spraying for painting is performed automatically using the air volume difference between the intake and exhaust air volume when changing the intake and exhaust air volume in the room equipment. 1. A spraying room apparatus for painting, characterized in that a plurality of air vent windows that can be opened and closed are provided on a side wall of the spraying room.