Spraying devices for pipeline inner wall

Abstract

The invention relates to the field of surface treatment and particularly discloses spraying devices for a pipeline inner wall. The spraying devices comprise an air bag, an electromotor, a vertically-arranged rotating shaft and a coating containing box which are sequentially connected from top to bottom. The electromotor is fixedly arranged in the center of the lower end of the air bag. The upper end of the rotating shaft is fixedly connected with the power output end of the electromotor. The lower end of the rotating shaft penetrates through the lower end of the coating containing box and is fixedly connected with the coating containing box. A plurality of spraying device bodies are arranged on the coating containing box. One end of each supporting pipe communicates with the side wall of the coating containing box, and the supporting pipes are fixedly connected with the coating containing box. A sliding block is arranged in one end, far from the coating containing box, of each supporting pipe. A connecting rod is arranged on one side, far from the coating containing box, of each sliding block. A discharging outlet is formed in the side face of each supporting pipe, and discharging outlets are located on sliding paths of the sliding blocks. One end of each corrugated pipe is fixedly connected with the discharging outlet of each supporting pipe. The other end of each corrugated pipe is fixedly connected with a corresponding sprayer. The spraying devices can uniformly spray the interior of a bent pipeline.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to a paint spraying device. Background technique [0002] Ships have been operating at sea for a long time, and both the outside of the pipeline and the inner wall of the pipeline are often eroded by sea wind and sea water. Mainly due to the high humidity and high salinity of the sea breeze, it is easy to undergo oxidation-reduction reactions with the metal in the pipeline. Seawater is equivalent to an electrolyte solution. The electrolyte and metal can form a battery, and electrochemical reactions occur to corrode metal pipelines. After some parts are corroded, other parts are basically unusable and need to be replaced as a whole, resulting in huge losses. [0003] At present, the anti-corrosion and anti-oxidation treatment of metal pipes generally adopts electroplating or spraying treatment. When spraying, the outer surface of the metal pipe can be sprayed more easily, but the in...

AI Technical Summary

Problems solved by technology

Mainly due to the high humidity and high salinity of the sea breeze, it is easy to undergo oxidation-reduction reactions with the metal of the pipeline. Seawater is equivalent to an electrolyte solution. The electrolyte solution and metal can form a battery, and an electrochemical reaction occurs to corrode the metal pipeline. When the pipeline After some parts are corroded, other parts are basically unusable and need to be replaced as a whole, resulting in huge losses

[0003] At this stage, the anti-corrosion and anti-oxidation treatment of metal pipes generally adopts electroplating or spraying treatment. When spraying, the outer surface of the metal pipe can be sprayed relatively easily, but the inner wall of the pipe will increase with the bending or diameter of the pipe. Difficulty, mainly because the spraying diameter of the inner wall spraying device is difficult to change when spraying, resulting in difficult processing, so most of the existing spraying devices can only spray the inner wall of straight pipes

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