Automatic spraying line: maintenance and use of spray gun

The spray gun is a very important equipment in automobile painting. Its structure is precise and the investment cost is relatively high. However, if the spray gun is used and maintained properly, the painting quality and service life will be much longer. The correct use and maintenance of spray guns is a basic skill that every painter must know.

1. The main points of spray gun use and maintenance:

(1) Frequently check the needle valve, gasket, and air valve gasket seals for leaks. If there is leakage, replace them in time; apply oil to the sealing gaskets frequently to make them soft and facilitate sliding.

(2) The thread of the air cap of the gun, the spray volume adjustment knob and the air adjustment knob, etc., should be frequently oiled to ensure flexible movement; the spray gun thimble and the spring of the air valve should also be coated with lubricating oil to prevent rust and facilitate sliding .

(3) Do not disassemble the spray gun at will. When disassembling is necessary, it should be noted that there should be no rubbish and paint on the rectangular parts, and the air cap and nozzle should not be damaged. After assembly, adjust to the original appearance, pull the trigger to test the air and paint The squirting effect.

(4) The spray gun should be thoroughly inspected before use to ensure that the spray gun is in good condition before it can be used.

(5) When using the spray gun, avoid hitting the coated object or falling on the floor, otherwise it will cause damage and become unusable.

(6) When the work is suspended, the spray gun head should be immersed in the solvent to prevent the coating from drying out and blocking the nozzle; but the entire spray gun should not be completely immersed in the solvent, which will damage the sealing gaskets of various parts and cause The phenomenon of air leakage and paint leakage.

(7) The spray gun should be cleaned in time after use, otherwise the paint channel will be blocked (especially 2K paint), it will be difficult to clean in the future, or even can no longer be used. After cleaning the spray gun, connect the paint tube and compressed air tube for test spraying, and adjust the fan surface of the spray gun. The fan angle of the manual air spray gun is 70-80 degrees. If there is any problem, report to repair in time.

The key to maintaining the spray gun is to clean it in time after use. This is a good preventive measure to prevent the spray gun from malfunctioning.