Electric arc spraying device suitable for inner wall of pressure vessel

Abstract

The invention belongs to the field of electric arc spraying and coating systems, and particularly relates to an electric arc spraying device suitable for the inner wall of a pressure vessel. The electric arc spraying device suitable for the inner wall of the pressure vessel comprises a spraying gun, a swing telescopic shaft, a rotary telescopic shaft, a rotary connecting mechanism, a sliding positioning base, a control cabinet, a wire and compressed air conveying pipe and a transmission mechanism. The swing telescopic shaft and the rotary telescopic shaft are connected through the rotary connecting mechanism. The rotary telescopic shaft is installed on a platform of the sliding positioning base. The wire and compressed air conveying pipe penetrates through the rotary telescopic shaft and the swing telescopic shaft and is connected with the spraying gun and the control cabinet. The transmission mechanism is assembled on a transmission shaft at the bottom of the rotary telescopic shaft. The electric arc spraying device can be used for conducting electric arc spraying operation on the inner wall of the welded pressure vessel and conducting repairing spraying operation on a weld zone of the inner wall of the pressure vessel, and thus the corrosion resistance of the inner wall of the pressure vessel is improved. The spraying process can be observed in real time and adjusted anytime, and operation steps are simple.

Description

technical field [0001] The invention belongs to the field of arc spraying coating system, and in particular relates to an arc spraying device suitable for the inner wall of a pressure vessel, which is used for high-efficiency and high-quality arc spraying on the inner wall of the pressure vessel, and can also be used for welds on the inner wall coating respray. Background technique [0002] The corrosion problem of pressure vessels during service is very serious. During the use of pressure vessels, the outer wall of the vessel is relatively easy to be protected against corrosion, while the corrosion environment in the inner wall of the vessel is more complex, and the corrosion of the inner wall cannot be observed intuitively, so the cost of corrosion protection is relatively high. The working characteristics of the pressure vessel determine that the bottom corrosion is more serious, and the steel plate at the bottom of the pressure vessel in the oil field corrodes close to ...

AI Technical Summary

Problems solved by technology

However, the efficiency of spraying with traditional hand-held spray guns is relatively low, and the uniformity and thickness of the coating cannot be controlled

In addition, there is a serious problem in spraying before the welding of the head and the cylinder, that is, the coating in the weld zone and the heat-affected zone after welding will melt into the weld or expand and fall off when heated. On the one hand, it will affect the metallurgical composition of the weld. , on the other hand, there is no coating protection in the weld area and the surrounding area of ​​the inner wall of the container, and the electrochemical corrosion will be accelerated due to the difference in composition between the coated area and the uncoated area

[0005] High-efficiency and high-quality arc spraying on the inner wall of the pressure vessel with the welded head, and effective re-spraying coating on the inner wall weld area. At present, there is no relevant equipment in China that can effectively achieve this.

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