Heating tool and heating method for thermal expansion pipe of plastic pipe

Abstract

The invention provides a heating tool and a heating method for thermal expansion of plastic pipes. The heat conduction element is used to receive the heat of the electric heating element and heat the inner wall and / or outer wall of the plastic pipe. After heating, the pipe expansion mold is used to expand the pipe; or The heat conduction element is made into the shape of a tube expansion mold, and the plastic tube is set on the thin end. After the plastic tube is heated, it is pressed and deformed to cover the thick end of the heat conduction element. / Or the uniform heating of the outer wall, the uniform expansion of the pipe wall in all directions during pipe expansion, the uniform thickness of the pipe wall after pipe expansion, and no weak points, improve the quality of the expanded pipe connection, improve the safety and reliability of the equipment, and improve the quality of the equipment; use adjustment The circuit precisely controls the temperature of the heating element, prevents the plastic tube from becoming brittle and shortens its life due to excessive temperature, improves product quality, and greatly reduces heating power. 20-200 watts is enough, saving electricity costs, low-carbon and environmentally friendly; it also completely eliminates hot air The noise of the gun, the working environment is comfortable and safe.

Description

technical field [0001] The present invention relates to the technical field of heat expansion and forming heating of plastic pipes, in particular to a heating tool and a heating method for heat expansion of plastic pipes. The inner wall and / or outer wall of the plastic pipe are electrically heated to realize uniform and rapid heating of the plastic pipe. Improve the uniformity and quality of pipe expansion. Background technique [0002] Many fluid equipment, such as semiconductor coating, cleaning, and etching equipment, need to use gas or liquid as the working substance. The fluid circulates in the equipment through plastic pipes. There are many plastic pipes of different thicknesses in the equipment. Plastic pipes of different diameters are connected through pipe joints. When the pipes are connected, it is often necessary to heat the plastic pipe, expand the diameter of the pipe while it is hot, and put it on the outer diameter of the pipe joint. [0003] At present, when...

AI Technical Summary

Problems solved by technology

[0003] At present, when the plastic pipe is thermally expanded, it is heated by a hot air gun, and the heat is transferred by forced convection of the hot air. , the power of the heat gun is large, generally between 700-2000 watts, and the heat utilization rate is very low, estimated to be less than 2%, because only a small amount of hot air is blown onto the plastic tube, and most of the heat is dissipated into the atmosphere with the hot air; The hot air gun makes a lot of noise when it is working, which makes people feel uneasy; the hot air gun heats the plastic tube by blowing hot air from one side, and the outer diameter of the plastic tube is heated unevenly, resulting in a large expansion rate of part of the tube wall and a part of the tube when expanding the tube. The rate is small, the thickness of the pipe wall is uneven after expansion, and sometimes it is tilted to one side after expansion, and the expanded part is not in the same axis as the unexpanded part, which leads to poor quality of the expanded pipe connection, and the thin part of the pipe wall is easily damaged. Leakage of liquid and gas will corrode the metal part of the electrical plug of the equipment, or cause a short circuit and equipment failure

Images