Composition adhesion type section steel lined polyethene multiple tubes and their processing method

Abstract

This invention involves one kind of constitutive steel liner polyethylene compound fitting it to include the metal collection siphuncle body, attaches in the metal collection siphuncle in vivo surface is cohering has a bed charge level. Attaches the caking in bed charge level above to have a polyolefine lining level. This invention also fords and its the processing craft, first carries on the steel pipe the superficial clean, processing and so on phosphorization, fixedly will lie in on the movable support after a surface treatment steel pipe end which might gyrate, will heat up the steel pipe and revolves on the support, will be hanging in the steel pipe in order is equipped with the bed charge to deliver the powder nozzle and the lining delivers the powder nozzle, the realization bed charge and the lining in order spurts spreads, respectively will deliver the powder nozzle with to deliver the powder unit permanent connection through the pipeline, evenly will spray by the bed charge nozzle blowout bed charge powder in on the steel pipe endophragm which will revolve, will follow closely after that the lining nozzle will start to carry on the lining to spray, the lining powder evenly will spray on the bed charge level, Respectively delivers the powder nozzle with the steel pipe internal surface which revolves to form the relative helical motion, the support relative respectively delivers the powder nozzle to make the straight line movement, spurts until the integral root steel pipe spreads finished.

Description

technical field [0001] The invention relates to a steel-plastic composite part and its processing technology, in particular to a structurally bonded steel-lined polyethylene composite pipe fitting and its processing technology. technical background [0002] At present, the steel-plastic composite material is the most widely used in the industry. The high-strength performance of carbon steel and the excellent corrosion resistance and abrasion resistance of plastics are combined to form a composite material used in the chemical industry, metallurgy industry, electric power, and environmental protection sewage. It is a material widely used in many industries such as seawater treatment, seawater salt industry and food. It is a problem that people have been paying attention to to make equipment and pipelines by lining polyethylene and carbon steel. However, it is very difficult technically; The main manifestations are: the surface energy of polyethylene material is low, which is ...

AI Technical Summary

Problems solved by technology

[0008] (1) The inner liner is easy to absorb and deform under negative pressure or instantaneous negative pressure during start-up and stop operations, especially when the temperature is 40°C-80°C

[0009] (2) The thermal expansion coefficients of the two materials are different, which will cause stress in the plastic, and this stress will be concentrated at the corner of the flange, so cracks often occur here, causing leakage

[0010] (3) Large-diameter pipes (diameter greater than 30 cm) cannot be manufactured, let alone used to manufacture equipment and storage tanks

Although this kind of process can produce large-diameter pipes, it has not yet solved the problem of interfacial bonding between polyethylene and carbon steel. The lining layer only relies on the physical adsorption of polyethylene and carbon steel to combine, and the bonding force is low. Very unstable, the lining layer often cracks and falls off during use, and the thickness of the lining layer can only reach about 1mm

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