Maintenance and maintenance of the pre-treatment pinch nozzle.
1 erosion. When a high flow rate liquid passes through the metal surface at the nozzle hole, it will erode the nozzle hole, causing the nozzle pressure to decrease and the spray state to become irregular. The probability of erosion of the nozzle depends on the hardness of the liquid, the spray pressure, the type of chemical used and its amount. In addition, particulate impurities in the liquid can also cause the nozzle to be severely eroded. Industrial nozzle
2 accidental damage. Improper use and inability to perform maintenance in a timely manner are the main causes of accidental damage to the nozzle. Although the nozzle opening is usually designed to be concave, the offset structure of the fan nozzle is easily damaged.
3 corrosion. These chemicals also cause corrosion of the nozzle material when the workpiece is sprayed with chemical materials.
4 blocked. The accumulation of chemical materials and impurities on the inside or outside of the nozzle can cause blockage of the nozzle. This will affect the spray shape of the nozzle and thus the spray pressure.
5 temperature. Operating the nozzle for a long period of time at high temperatures or abnormal temperatures can cause the nozzle to be damaged by softening of the material.
Second, the identification of the nozzle problem When the spray pump is operated according to its rated capacity, the spray pressure of the nozzle will decrease with the expansion of the nozzle aperture. For a damaged nozzle, even if the actual flow rate of the nozzle exceeds 30% of its rated flow rate, the change in atomization state is difficult to recognize with the naked eye.
The best way to identify the nozzle problem is to observe the pressure changes in the spray tube. The position and accuracy of the gauge is critical when comparing different nozzles in the same pre-treatment system. Usually the pressure gauge should be placed at the front end of the spray tube. When determining the pressure change on the spray line, the nozzle should be judged by the difference between the actual pressure and the reference pressure based on the spray pressure of the intact nozzle.
Third, the elimination of the nozzle problem Because it is difficult to directly detect the nozzle problem with the naked eye, so we must first pay attention to the choice of nozzle. Once you have selected the right nozzle, you will have a complete set of maintenance and replacement plans. Spiral nozzle 1 Check the nozzle regularly. This includes periodic cleaning of the nozzles and regular inspection of the appearance of the nozzles for damage. Generally, the nozzles of the first few processes (such as pre-degreasing and degreasing) in the pre-treatment production line should be inspected and cleaned every shift, and the frequency of inspection and cleaning of the subsequent process sprays can be appropriately long.
2 Change the nozzle regularly. The frequency of nozzle replacement depends on the environment in which it is located.
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Submission:
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