Pipe fitting internal coating production process

Abstract

The invention provides a production process for an inner coating of a pipe fitting. The production process comprises the following steps: preparing a fluidized bed, starting a negative pressure device, preparing a pipe fitting machined part, forming the inner coating of the pipe fitting machined part and recycling materials, in the step of forming the inner coating of the pipe fitting machined part, a negative pressure tank is communicated with the pipe fitting machined part, so that the pressure of an inner cavity of the pipe fitting machined part is equal to the pressure in the negative pressure tank, and the pipe fitting machined part is in a negative pressure state; and the fluid powder in the fluidized bed is rapidly filled into the pipe fitting processing part, and is rapidly melted by virtue of heat of the pipe fitting processing part to form an anti-corrosion layer. The production process disclosed by the invention is simple to operate and convenient to use, and the anti-corrosion layer produced by the method is uniform in thickness and high in production rate; dependence on human skills is avoided; one device can replace 3-4 operators, and about 2000 elbow pipe fittings can be produced if one device works for 8-9 hours per day, so that the production cost is greatly saved; and no powder flies to a worker operation room, and the environmental protection property is high.

Description

technical field [0001] The invention relates to the technical field of forming inner coatings of pipe fittings, barrels, boxes, etc., and in particular to a production technology of inner coatings of pipe fittings. Background technique [0002] Most of the drinking water in our country is transported by buried pipelines, which puts forward very high requirements on the quality and corrosion resistance of the pipelines, especially the inner wall of the pipelines, which has extremely strict requirements on corrosion resistance. At present, the general means of anti-corrosion is to carry out anti-corrosion treatment on the inner walls of pipes, elbows, tees, reducing pipes, flanges, etc. Most of them spray anti-corrosion layers on the inner walls of pipe fittings, and the anti-corrosion layers are generally epoxy resin ( EP) or polyethylene (PE). [0003] The traditional method is: taking the elbow as an example, one end of the heated elbow is first blocked with an end cap, an...

AI Technical Summary

Problems solved by technology

There are many disadvantages in adopting such a production method. One is that the pipe fittings are heated at high temperature, and the operator is easy to burn their hands even if they wear heat-resistant gloves; the other is that it is necessary to pour out the excess powder in the elbow, which is slow and efficient. Low; Third, hiring workers, the production cost is high; Fourth, it needs constant shaking to ensure the uniformity of the anti-corrosion coating on the inner wall, so the work intensity is high and the work efficiency is low. If a male worker works 8 to 9 hours a day , about 500 pieces can be completed

[0004] With the advancement of science and technology, the method of spraying the inner wall of pipe fittings with a spray gun came into being. However, when using a spray gun, the dry powder is easy to fly, and the thickness of the anti-corrosion inner wall formed by this method is uneven; moreover, the powder output rate of the spray gun is extremely low. , Generally, if one square of air is sprayed, it only contains 2% to 3% of powder, so it takes a long time to form an anti-corrosion layer, resulting in extremely low spraying efficiency

[0005] There is also a way of positive pressure to press the flowing powder into the pipe fittings. The production process and production equipment in this way have not been realized.

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