Steel pipe plastic coating hot air furnace

Abstract

The invention discloses a steel pipe plastic coating hot air furnace, which comprises a hot air drying passage and a combustion chamber, wherein the combustion chamber is positioned outside the hot air drying passage; the combustion chamber is connected with a burner; the two end parts of the hot air drying passage are respectively provided with furnace doors; the top of the hot air drying passage is provided with an air return opening; air supply openings are respectively formed in the two sides of the hot air drying passage; the inner side wall of the hot air drying passage is provided with a side air passage communicating with the air supply opening of the hot air drying passage; the side air passage is provided with a plurality of hot air outlets; the combustion chamber is provided with an air outlet and an air return opening; the air outlet of the combustion chamber is connected with a fan and communicates with the air supply opening of the hot air drying passage; the air return opening of the hot air drying passage communicates with the air return opening of the combustion chamber through an air return pipeline. The hot air furnace has the advantages that the temperature rise speed is high; the hot air in the hot air drying passage is uniform; the heat efficiency is high.

Description

technical field [0001] The invention relates to the technical field of steel pipe coating equipment, in particular to a steel pipe plastic coating hot blast furnace. Background technique [0002] Plastic-coated steel pipe inside and outside, plastic-coated steel pipe inside and outside is a layer of polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP) or non-toxic Steel-plastic composite pipes made of polyvinyl chloride (PVC) and other organic substances. Plastic-coated steel pipe not only has the advantages of high strength, easy connection, and water impact resistance, but also overcomes the shortcomings of steel pipes such as easy corrosion, pollution, scaling, low strength of plastic pipes, and poor fire performance. [0003] Large-diameter steel pipes generally refer to steel pipes with a nozzle diameter of 300mm to 2400mm, which can be coated with plastic coatings with different properties such as polyvinyl ch...

AI Technical Summary

Problems solved by technology

Although this kind of heating furnace can heat the steel pipe to a predetermined temperature, it is easy to cause uneven temperature on the steel pipe due to the heating of the steel pipe after the fuel is burned. Even if the heat conduction speed of the steel pipe is fast, the steel pipe must be heated to a temperature higher than that When the temperature drops to the plastic coating temperature, it is possible to form a uniform temperature. Therefore, this heating method wastes energy, and at the same time, it will also generate dirt on the surface of the steel pipe.

The most important problem is that after using this kind of heating furnace to heat the steel pipe, the furnace door must be opened and the steel pipe must be taken out. Because the operation of taking out from the high-temperature furnace and putting in the steel pipe is relatively difficult, even if it is operated by mechanical equipment, it will take more time. A long time will cause a large loss of heat in the furnace

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