Process for coating inner wall and outer wall of pipeline and equipment

Abstract

The invention discloses a process for coating an inner wall and an outer wall of a pipeline and equipment suitable for the process. By adopting the process and the equipment, the coating of the inner wall and the outer wall of the pipeline can be once completed through integral plastic dipping so as to facilitate the large-scale streamline production; in addition, coating layers of the inner walland the outer wall of the pipeline can be guaranteed to be uniform, and the coating quality also can be controlled; moreover, the utilization rate of plastic powder can be effectively improved, thereby the production cost is reduced. The invention has reasonable and continuous process and lower production cost and is beneficial to greatly improving the production speed and forming large-scale continuous production.

Description

technical field [0001] The invention relates to a pipeline coating process and related equipment, in particular to a coating process and related equipment for simultaneously coating the inner and outer walls of a pipeline. Background technique [0002] With the continuous development of social economy and the increasing level of urban construction and industrial production, the performance requirements for the pumping and discharging pipes in industrial production, urban water supply and drainage pipes, power threading pipes and communication cable optical cable pipes are also increasing. The pipes widely used in the above fields generally have two materials, one is PVC (polyvinyl chloride) pipes, and the other is metal pipes (mainly steel pipes and cast iron pipes). PVC pipes made of polyvinyl chloride are light in weight, easy to install and replace, bright in color, and ideal in chemical corrosion resistance, but they have the disadvantages of poor pressure resistance and...

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Problems solved by technology

However, the technical solutions of the above two technologies also have some defects: First, in the above two technical solutions, the inner surface adopts the vacuum powder spraying process, while the outer surface adopts the rotating pipeline electrostatic spraying process, so the pipeline coating needs to be completed step by step , the processing operation is cumbersome; secondly, the electrostatic spraying of rotating pipes is easy to cause uneven thickness of the coating layer on the surface of the pipes, which is difficult to control and affects the quality of the coating; thirdly, commonly used metal pipes, some of which have small inner diameters, use equipment to It is relatively difficult to spray the inner wall of the pipeline; fourth, in the above process, the effective utilization rate of the sprayed plastic powder is low, and the cost of coating operation is high

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