In the painting operation, the air spray paint is the most widely used and the largest. According to sampling measurements, the spraying operation area of most factories is continuously sprayed, the paint mist in the operation area is dense, and the vapor concentration of xylene or toluene in the air is as high as 600 ~ 2400mg/m 3 , which is consistent with GBZ2-2002 "Industrial Sites Hazardous Factors Occupational Exposure Limits "Compared with the maximum allowable concentration of 100mg/m3, it exceeds 6~24 times, and the operator's chronic benzene poisoning is quite serious.
The most important measure for the anti-virus safety of air spraying is to strictly limit the spraying operation to the spraying room. It is necessary to stipulate that painting shall not be carried out without using a spray booth, and the technical , which shall be appraised by the safety production supervision and management department. Inspection and certification approval, only spray booths that have received a license are allowed to be put on the market for users to choose to use.
The spray booth is a safety equipment with mechanical ventilation. It is a closed or semi-closed enclosure structure. The indoor air flow organization should be able to effectively capture paint mist and solvent vapor, and be treated by a dry or wet paint mist removal device Finally, a certain removal rate of paint mist is achieved, so that it can be discharged safely in a concentrated manner, and at the same time ensure that the measured concentration of solvent vapor in the operator's breathing complies with the provisions of CBZ2-2002 "Occupational Exposure Limits ".
Generally speaking, the role of the spray booth is to solve the anti-virus safety of the painting operation. Specifically, its role has the following aspects.
(1) The spray booth limits the spraying of the workpiece to a certain area, so that the air gathers and is discharged after being treated by the paint mist removal device. The production department adjacent to the spray booth will not be affected. Compared with before the spray booth is adopted, the occupational safety and health conditions in the workshop and the surrounding environment have been significantly improved.
(2) Since there is an airflow organization with a certain flow direction inside the spray booth, it can ensure that the air pollution received by the operator when spraying paint significantly reduced, so that the operation area complies with GBZ2-2002 " Occupational Exposure Limits of Hazardous Factors in Industrial Sites" Provisions.
(3) Since the painting of the workpiece is limited to the spraying room, it is easy to control and adjust the temperature, humidity and air cleanliness in this limited area. For example, in winter, hot air can be sent to the spraying room, and in summer, it can be sent to the spraying room Sending cold air improves the occupational safety and health conditions of the operators, and at the same time provides a working environment that meets the technical requirements for workpieces with high decorative requirements. The air supply volume of the large spray booth is very large, and the air supply is not heated in winter , so the operator can hardly work normally. In foreign countries, such as the United States, it is stipulated that the air supply temperature of the spray booth in winter should not be lower than 18C.
