Electric heating pipe manufacturing method

Abstract

The invention relates to an electric heating pipe and a manufacturing method thereof. The manufacturing method includes winding a double-wire-ring resistance wire in a preset length, fixedly sleeving two ends of the resistance wire on upper wire stations of two wire rods, and obtaining a double-resistance-wire component; arranging the double-resistance-wire component in a metal pipe, adding insulation powder into the metal pipe via a powder adding machine, vibrating powder by a power vibrating machine, and obtaining an electric heating pipe component; and contracting the electric heating pipe component by a pipe contracting machine according to the preset size, and obtaining the finished electric heating pipe in corresponding size. For long electric heating pipes low in rated voltage and high in rated power, the parallel-connection double-resistance-wire structure is adopted, the diameter of the resistance wires is reduced, and winding of the resistance wires is realized. Meanwhile, load of the resistance wires is reduced, and the service life of the electric heating pipe is prolonged. In addition, procedures of pretensioning and ohmic-heating pretensioning before powder filling of the resistance wires are added, and the problem that the welded joints of the upper wire stations of the resistance wires and the wire rods are easy to break by tensioning during powder vibrating and pipe contracting is solved.

Description

[0001] This application is a divisional application, the application number of the original application is: 201210030828.2, the application date: 2012-2-13, and the name of the invention is "An Electric Heating Tube and Its Manufacturing Method". technical field [0002] The invention relates to a manufacturing method of an electric heating tube. Background technique [0003] The voltage range of each country is different (100V-440V), the power range of the electric heating tube is different (100W-5000W), the use environment is different, the diameter of the electric heating tube is different, etc., which requires the design requirements and manufacturing process of the resistance wire of the product Higher and higher. In China, although electric heating tubes have been produced for 20 years, the manufacturing technology of electric heating tubes is still very backward. Many products with low rated voltage but high rated power are limited by the production process, so that t...

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Problems solved by technology

In China, although electric heating tubes have been produced for 20 years, the manufacturing technology of electric heating tubes is still very backward. Many products with low rated voltage but high rated power are limited by the production process, so that the diameter of the single resistance wire is large and the strength of the resistance wire is too high. High, causing the wire winding machine to fail to wind the wire, and the welding place between the resistance wire coil and the upper line of the lead rod is easy to break during the powder loading process and the shrinking process, resulting in the problem that the electric heating tube cannot be manufactured if the length of the electric heating tube is more than 1500mm; for household electric heating For the pipes (Φ6.2mm, 6.5mm, 8.0mm, 8.5mm) selected for the pipe, for products with small rated voltage and high rated power, the resistance requirements must be met. If a single resistance wire structure is used, the resistance must be The wire diameter increases, causing the bending strength of the resistance wire to be too large, and the winding distance between the outer diameter of the resistance wire ring and the inner wall of the electric heating tube is too short, which seriously affects the electrical performance of the electric heating tube

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