The recovery system of the powder coating line is mainly responsible for collecting and processing the excess powder that is not attached to the workpiece during the spraying process. The following is a description of its working principle:
First, during the spraying process of the powder coating line, the equipment room is usually kept in a negative pressure state, and the opening area on both sides is minimized to reduce the escape of dust. In this way, most of the powder that is not attached to the workpiece will be confined in the powder spraying room.
Then, the recovery system generates suction through the fan, and the powder that is not attached to the workpiece in the powder spraying room is sucked into the recovery device with the air flow. In the recovery device, the powder first enters the cyclone separator for primary recovery. In the cyclone separator, the powder and air generate centrifugal force through rotation. The powder is thrown to the wall of the device due to its large mass and falls into the powder collecting barrel, while the air is discharged from the top.
After the primary recovery, most of the powder has been separated, but there is still a part of ultrafine powder, dust, lint and other impurities that need to be further separated through the secondary recovery filter. These impurities are sucked into the post filter and filtered out by the filter element. The high magnetic pulse valve inside the filter element will work intermittently, and the ultrafine powder on the filter element will be automatically cleaned by the pulse filter element cleaning method to ensure the continuous filtering effect of the filter element.
The air treated by the secondary recovery filter is relatively clean and can be discharged into the operating workshop or the atmosphere. After the recovered powder is screened and filtered, the powder coating line can be transported to the centralized powder feeder of the powder supply center again for recycling.
It is worth noting that some ultrafine powders in the recovery system may not be effectively separated by the filter element due to their small particles. This part of the powder usually accumulates on the filter element and needs to be cleaned regularly. When cleaning, the filter element can be removed for manual cleaning or replaced with a new one.
Finally, the entire recovery system needs regular maintenance and care to ensure its long-term stable operation. This includes checking the operating status of the fan, cleaning the accumulated powder in the cyclone separator and the after filter, and replacing damaged filter elements. Through regular maintenance and care, the efficiency and service life of the recovery system can be improved.
