Coating and heating device of large-caliber plastic-coated composite steel pipe

Abstract

The invention relates to a coating and heating device of a large-caliber plastic-coated composite steel pipe. The coating and heating device comprises a primary heating furnace, coating mechanisms, a conduction frame and a secondary heating furnace, as well as a buffering conduction frame, wherein the conduction frame is arranged behind the primary heating furnace, two sides of the conduction frame are respectively provided with the coating mechanism, the secondary heating furnace is arranged behind the conduction frame, and the coating and heating device is characterized in that the coating mechanisms are double-directional inner adsorption coating mechanisms, and the buffering conduction frame is arranged between the conduction frame and the secondary heating furnace. The coating and heating device is scientific and reasonable in structure design, and has the advantages that high production efficiency and uniformity coating can be realized, the quality of a produced composite pipe is high, production cost is lowered, long-term development of the enterprise is facilitated, and high innovation performance is achieved.

Description

technical field [0001] The invention belongs to the field of processing equipment for plastic-coated composite steel pipes, in particular to a plastic-coating and heating device for large-diameter plastic-coated composite steel pipes. Background technique [0002] Plastic-coated composite steel pipe is to melt a layer of polyethylene (PE) resin or ethylene-acrylic acid copolymer (EAA) or epoxy (EP) powder or non-toxic polypropylene (PP) or The steel-plastic composite pipe made of non-toxic polyvinyl chloride (PVC) and other organic substances not only has the advantages of high strength, easy connection, and water impact resistance of steel pipes, but also overcomes the corrosion, pollution, scaling and Plastic pipes have disadvantages such as low strength and poor fire performance, and the design life can reach 50 years. [0003] The production process of the composite steel pipe is generally as follows: the steel pipe is heated once in the primary heating furnace, and the...

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Problems solved by technology

The existing conductive frame can only pass one composite steel pipe at a time. Since the heating time of the steel pipe is longer than the time for plastic coating of the steel pipe, when working in the secondary heating furnace, the previous process, that is, the steel pipe on the conductive frame and the The steel pipes in the plastic coating process need to be put on hold, and the subsequent heating of the steel pipes can be carried out only after the steel pipes in the secondary heating furnace are heated. The production efficiency is extremely low and the production cost is high, which is not conducive to the long-term development of the enterprise.

Moreover, the existing processing methods of large-diameter plastic-coated composite pipes are relatively backward. Generally, spray guns are used to enter the pipe through electrical control to spray the inner wall of the pipe. quality problem

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