1、 Working principle

Box type high-efficiency filter is a terminal filtration equipment used in the painting industry for clean air supply, mainly providing clean air for enclosed paint spraying rooms, hot cleaning furnaces, and cooling areas. The airflow to be processed passes through the high-efficiency filter material inside the box, relying on multiple mechanisms such as microporous screening, inertial collision, and diffusion adsorption of the filter material to intercept dust particles and fiber impurities in the air and prevent dust from falling onto the surface of the workpiece paint film. The equipment adopts an integrated sealed box structure, and the filter material is folded and widened to increase the filtering area and reduce air flow resistance. A sealing strip is installed at the junction between the box and the filter material to prevent leakage of the airflow bypass and ensure that all incoming air is purified by the filter material. The equipment is installed at the end of the air supply duct, and clean air is sent into the process chamber to avoid paint film particles and pitting defects caused by external dust. Equipped with a differential pressure detection interface, it monitors the pressure difference before and after the filter to determine the degree of blockage of the filter material. When the pressure difference reaches the set value, it prompts the operation and maintenance personnel to replace the filter element in a timely manner, ensuring the stable cleanliness level of the air supply in the painting workshop.

2、 Technical parameters

1. Filtration process: Box type high-efficiency particle filtration process, achieving interception and purification of suspended particulate matter in the air;

2. Homework method: Online continuous filtering operation, continuous operation of the air supply system connected to the painting production line;

3. Equipment configuration: metal box frame, foldable high-efficiency filter material, sealing strip, protective net, pressure difference detection interface;

4. Process conditions: working temperature -10-70 ℃, rated wind speed 0.4-1.2m/s, initial resistance 180-260Pa;

5. Filtration index: The filtration efficiency for 0.3 μ m particles is ≥ 99.9%, the sealing is reliable without gas bypass leakage, and the cleanliness of the exhaust meets the requirements of the coating process;

6. Protective performance: The box is corrosion-resistant and rust proof, suitable for humid and dusty working environments in paint spraying workshops;

7. Applicable working conditions: closed spray painting room, powder spraying cooling area, cooling inlet of thermal cleaning equipment, air supply purification of painted workpiece cooling room;

8. Supporting performance: Modular box structure, easy disassembly and assembly, multiple units can be connected in parallel, adapted to different air volume requirements, and supports pressure difference alarm prompts.

3、 Application scope

The box type high-efficiency filter solves the problem of insufficient filtration accuracy in ordinary air supply, external dust entering the process chamber, particle pitting and paint film defects on the surface of the workpiece, and is a key end equipment for clean air supply systems in painting. Widely used in dry powder spraying rooms, enclosed paint spraying rooms, forced air cooling stations after coating curing, cooling inlet air for hanging hot cleaning furnaces, rail transit component coating lines, tank container coating production lines, automotive parts painting, and metal chassis sheet metal coating projects. During the spraying and cooling stages of workpieces, once suspended dust in the air falls onto the surface of the uncured paint film, it directly causes poor product appearance and increases the rate of rework and repair. Box type high-efficiency filters can deeply purify the air sent into the process chamber. The pleated filter material has a large filtration area and controllable operating resistance. The modular structure can be flexibly combined according to the on-site air volume, which is suitable for both large automated painting assembly lines and small single machine spraying equipment. The equipment maintenance is simple, and the clogging status of the filter element can be intuitively judged through the pressure difference value, reducing the difficulty of operation and maintenance. Suitable for equipment manufacturing enterprises, tank truck processing factories, rail transit supporting manufacturers, and spray processing factories, it is a specialized box type filtration equipment that ensures the appearance quality of workpieces through coating technology and achieves clean air supply.