The filter element of the filter is clogged

There is water inside the Venturi pump, and the powder pump cannot produce powder (work)

Compressed air contains water. If water enters the spray gun controller, it will burn out the main circuit board

It will lead to low voltage and high current, damaging the spray gun

1. Shrinkage holes caused by oil and gas in compressed air.

2. Shrinkage holes caused by moisture in the powder.

3. Shrinkage holes caused by the damage of the powder sieve in the powder factory.

4. Shrinkage holes caused by the powder formula.

5. Shrinkage holes generated in the powder supply system.

6. Shrinkage holes caused by the volatilization of silicone.

7. Shrinkage holes caused by the contamination of powder additives.

8. Shrinkage holes generated in the curing oven (due to dust).

9. Shrinkage holes caused by particles on the profile surface (graphite particles or high - temperature burrs).

10. Shrinkage holes caused by the feeding auxiliary rack (PVC debris).

11. Shrinkage holes caused by the reason of oil removal in the pre - treatment (silicone oil).

12. Shrinkage holes caused by the addition of chromating agent.

13. Shrinkage holes caused by newly burned hangers.

14. Shrinkage holes generated by the hanging chain of the horizontal line (oil receiving trough).

15. Shrinkage holes caused by the aging of the powder supply system.

16. Shrinkage holes formed by the contamination of the spray booth.

17. Shrinkage holes caused by line stoppage during the chromating process of the pre - treatment of the vertical line or failure to turn on the water for washing after chromating.

The fluidization gas of the powder in the powder bucket should not be too large. As long as it can ensure that the pressure of the powder flowing in the powder bucket is as small as possible, the better. If it is too large, it will cause the powder gas to overflow. Moreover, the powder concentration sucked by the powder pump is low, resulting in a small powder output and easy wear of the Venturi inner tube. The correct solution: Use the fluidized gas reasonably and clean and maintain the Venturi pump and nozzle in a timely manner.

To ensure the powder coating rate, it is necessary to regularly clean the discharge needle of the spray gun and the duckbill, adjust the static voltage and current properly, and check the conductivity of the workpiece hanger.

The suspension chain of the workpiece must be well grounded. If the grounding is not good, it will cause poor powder coating, arc sparks will occur between the spray gun and the workpiece, and between the workpiece and the suspension chain. There is also a possibility of fire and explosion. The surface coating of the hanger should be cleaned in time to ensure that the workpiece is well grounded.

The distance between the spray gun and the workpiece should be approximately 20 to 30CM, as this distance ensures more uniform atomization and charging of the powder. If it is too close, it may cause electric shock pinholes. If it's too far away, the powder application rate won't reach the required level, and the powder won't be sprayed into the dead corners.