Why are there impurities in the coating during the robot spraying process?

No matter what process is used for painting, the role of painting is a problem that everyone pays attention to. Spraying robots are no exception. The sprayed coating contains impurities, which not only affects the spraying effect, but also affects the appearance. In serious cases, it may be reworked. The following summarizes the qualitative places and evasive methods in the process of spraying robots for your reference:

　　 1.1 Impurities in the curing furnace. The solution is to thoroughly clean the inner wall of the curing oven with a damp cloth and a vacuum cleaner, focusing on the gaps between the suspension chain and the air duct. If it is black large particles of impurities, you need to check whether the filter of the air supply pipe is damaged, and replace it in time.

　　1.2 Spraying robot impurities. It is mainly dust, clothing fibers, equipment abrasive particles and dust deposits in the powder spraying system. The solution is to use compressed air to purge the powder-spraying system every day before starting work, and thoroughly clean the spraying robot equipment and powder-spraying room with a damp cloth and vacuum cleaner.

　　 1.3 Hanging chain impurities. It is mainly the product of suspension chain oil baffle plate and primary spreader water tray (the raw material is hot-dip galvanized plate) corroded by pretreatment acid and alkali vapor. The solution is to regularly sort out 1.4 powder impurities in these facilities. The main reasons are excessive powder additives, uneven pigment dispersion, and powder spots caused by powder extrusion. The solution is to improve the powder quality and improve the powder storage and transportation methods.

　　1.5 Pre-treatment impurities. It is mainly caused by large particles of impurities caused by phosphating slag and small impurities caused by yellow rust of phosphating film. The solution is to sort out the slag accumulated in the phosphating tank and spray pipe in time, and control the concentration and proportion of the phosphating tank liquid.

　　 1.6 Water quality impurities. It is mainly the impurities caused by the excessive sand and salt content in the water used in the pretreatment of the spraying robot. The solution is to add a water filter and use pure water as the last two levels of cleaning water. 2. Shrinkage of coating 2.1 Shrinkage caused by residual surfactant after degreasing or water washing after degreasing. The solution is to control the concentration and proportion of the pre-degreasing tank and the degreasing tank liquid, reduce the amount of oil in the workpiece and strengthen the washing effect.

　　2.2 Shrinkage caused by excessive water oil content. The solution is to increase the water inlet filter to prevent oil leakage from the water supply pump.

　　 2.3 Shrinkage caused by excessive moisture content of compressed air. The solution is to discharge compressed air condensate in time.

　　2.4 Shrinkage caused by moisture. The solution is to improve the powder storage and transportation conditions, increase the dehumidifier to ensure that the powder is recovered in time, use the 2.5 suspension chain, and the oil stains on the suspension chain are blown down by the air conditioning wind to the work caused by the shrinkage holes. The solution is to change the orientation and direction of the air-conditioning air outlet.