Insulating pipe polyethylene oversheath processing technology

Abstract

The invention discloses an insulating pipe polyethylene oversheath processing technology and is characterized in that the processing technology comprises the following operation steps of: (1) placing a steep pipe with a foaming heat-insulation layer on a movable bracket; (2) fixing one end of a polyethylene wrapping tape on the steel pipe; (3) starting the bracket to make the steel pipe to rotate in the axial direction at a constant speed on the bracket and move forward horizontally at a constant speed, and uniformly winding the polyethylene wrapping tape on the heat-insulation layer. The technological method of winding the polyethylene wrapping tape on the heat-insulation layer of the steel pipe is adopted in the invention so as to overcome various insufficiencies such as high cost, inconvenient operation and caliber restriction due to the adoption of an original polyethylene outer cannula. It can be not restricted by the caliber of the steel pipe by directly winding on the foaming heat-insulation layer, and the winding thickness can also be adjusted according to requirements. As the foaming comes before the winding, the foaming pressure doesn't need bearing. Therefore, the thickness of the winding material is small and the material is saved.

Description

technical field [0001] The invention belongs to a processing method of a thermal insulation pipe, in particular to a processing technology of a polyethylene outer sheath of a polyurethane thermal insulation steel pipe. Background technique [0002] In the prior art, the thermal insulation steel pipe mostly includes the innermost steel pipe, the middle insulation layer and the outermost outer sheath. The insulation layer is generally made of polyurethane material, and the outer sheath is made of polyethylene material. The polyethylene outer sheath has The role of waterproof seal. At present, the polyethylene outer sheath adopts a casing structure, that is, according to the standard, the polyethylene casing is first processed in the extruder, and then the polyethylene casing is placed on the outside of the steel pipe. Set the support block to keep the space uniform. Then implement polyurethane foam between the two, and fill the space between the steel pipe and the polyethyle...

AI Technical Summary

Problems solved by technology

Its shortcomings are: the processing procedure is cumbersome, and it is necessary to add processing equipment for polyethylene sleeves. Due to the large diameter and long length of the sleeves, the equipment is large in size and high in cost, and the processed sleeves often have poor roundness. , uneven phenomenon, high scrap rate

Moreover, this process is to produce the corresponding casing according to the thickness of the steel pipe, so the polyethylene casing is limited by the caliber, and the equipment needs to be replaced frequently, which is troublesome to operate

In addition, this process is foaming between the steel pipe and the polyethylene casing, which requires the polyethylene casing to have a certain thickness to meet the pressure generated by the foaming. In this way, the thicker casing increases the input of raw materials, causing great big waste