Spraying method for preventing steel plate hot mark machine spray head from being blocked

Abstract

The invention discloses a spraying method for preventing a steel plate hot mark machine spray head from being blocked. The method comprises the following steps of: a, starting spraying for the first time, namely continuously filling compressed air into an atomization air cavity of the spray head; b, opening a spray head paint nozzle and spraying paint; c, after finishing the paint spraying for the first time, closing the spray head paint nozzle; d, stopping filling the compressed air, continuously filling cooling water into the atomization air cavity, and stopping filling the cooling water when the spraying for the next time is started; and e, repeating the steps from a to d until marking operation is finished. In the spraying method, the spray head is cooled by the continuous compressed air in a spraying process, and the spray head is cooled by the continuous cooling water after the spraying is finished, so the temperature of the paint in the spray head paint cavity is kept in a lower range, the solidification of the paint is not affected by high temperature of a steel plate, and the failure rate of the spray head is low; and besides cleaning and cooling the spray head, the continuously sprayed cooling water also plays a role in removing dust in the air from the paint at the same time, so the air in the working environment is cleaner.

Description

technical field [0001] The invention relates to a spraying control method of a spray head of a steel plate heat marking machine, in particular to a spraying method capable of preventing blockage of the spray head. Background technique [0002] The steel plate hot marking machine is installed in the exit roller table area of ​​the hot straightening machine of the main rolling line, and it can print characters on the upper surface of the hot steel plate. rice. The steel plate thermal marking machine uses high-temperature resistant water-based paint as the printing medium, and the temperature of the spray-printed steel plate can reach up to 1050°C. [0003] The nozzle of the steel plate hot marking machine is equipped with a paint chamber, a primary atomization air chamber and a secondary atomization air chamber; when spraying, the armature attracts the valve core in the paint chamber to open the nozzle of the paint chamber, the paint is sprayed out, and the primary atomizatio...

AI Technical Summary

Problems solved by technology

[0004] In this spraying method, after one marking is completed, the paint in the paint chamber will be baked by the high-temperature steel plate above hundreds of degrees, without cooling medium to cool it down, and the paint in the paint chamber cannot realize automatic circulation. Even if high temperature resistant paint is used, this spraying method is also easy to cause the paint in the paint chamber to solidify and block the nozzle

In production practice, the nozzle clogging failure rate is high, the maintenance workload of the nozzle is large, and the operation efficiency is low

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