Winding method of heat-shrinkage adhesive tape used for bent pipe

Abstract

The invention discloses a winding method of heat-shrinkage adhesive tape used for a bent pipe. Three-stage heating processes are adopted, and the three-stage heating temperatures are strictly controlled. A pipe body is preheated in the first-stage heating process; the double faces of the heat-shrinkage adhesive tape are heated in the second-stage heating process; the pipe body wound with the heat-shrinkage adhesive tape is heated in the third-stage heating process, a rolling and grinding process is comprehensively utilized for rolling and grinding the bent pipe in a winding mode, and the feeding size of the bent pipe and the overlapping size of the heat-shrinkage adhesive tape are strictly limited, so that the purposes that the winding precision is high, the surface of a coating layer is flat and smooth and free of wrinkles, warping edges and bubbles, the coating layer overlapping position is flat, excessive glue is sufficient and uniform, and the service life of the heat-shrinkage adhesive tape is consistent with that of the pipe are achieved; and meanwhile, the problems that the labor intensity of manual winding is high, the heat-shrinkage adhesive tape is prone to winding deviation, and winding is not firm are solved.

Description

technical field [0001] The invention relates to a heat-shrinkable tape winding method for pipes, in particular to a heat-shrinkable tape winding method for bent pipes. Background technique [0002] In petroleum, chemical, heating, natural gas, and gas-liquid pipeline systems, it is inevitable that there will be places where pipeline layout needs to be turned. Therefore, elbows play an important role in various pipeline transportation systems. The manufacturing difficulty of the curved pipe is higher than that of the straight pipe, and the processing difficulty of the curved pipe is more difficult than the heightening of the straight pipe. Since the environment in the pipeline is generally harsh, in order to improve the service life of the elbow, a layer of heat-shrinkable anti-corrosion tape is usually wrapped on the surface of the elbow to resist the corrosion of the elbow by humid air and corrosive liquid in the environment. [0003] At present, the heat-shrinkable tape o...

AI Technical Summary

Problems solved by technology

[0003] At present, the heat-shrinkable tape of the elbow is mainly heated and wound manually; the more advanced one is to use a semi-automatic winding trolley to make a circular motion on the bend and heat the heat-shrinkable tape at the same time, which requires at least two to three Only with the cooperation of human beings can the winding operation of the heat-shrinkable tape be completed; there is no precedent for using an automatic pipe bending machine to wind the heat-shrinkable tape

The problems that are likely to occur in the method of manually winding the heat shrinkable tape are: 1. When winding the bend pipe with a large curvature, due to the unstable stretching tension and the unfixed running track of the cart, the heat shrinkable tape is easy to appear. The edge is lifted, the overlap is uneven, uneven, and there is a skirt; 2. The manual method of winding the anti-corrosion tape of the elbow pipe has high labor intensity, and at the same time, the heat shrinkable tape is prone to deviation and winding. The problem is that the surface of the heat-shrinkable tape is uneven, and the adhesion of the heat-shrinkable tape is not good, which affects the service life of the elbow; 3. At present, in the actual production process, it is generally artificial to use round wood on the surface of the steel pipe. Pushing while winding, this method cannot drive out the air bubbles well due to insufficient manual pushing pressure and uneven pushing pressure, and the working efficiency is limited