Preparation method for surface enameled preheating electric heating tube assembly

Abstract

The invention relates to a preparation method for a surface enameled preheating electric heating tube assembly. The method comprises the steps of 1), winding a resistance wire of a preset length, fixing the resistance wire on a magnesium oxide tube base, and fixedly sleeving two ends of the resistance wire on the wire mounting positions of two lead bars, thereby obtaining a resistance wire assembly; 2), arranging the resistance wire assembly in a metal tube; 3), shrinking the electric heating tube assembly according to a preset size by employing a tube shrinking machine; 4), pre-starting the electric heating tube assembly shrunk in the step 3) and closing the electric heating assembly for high-temperature processing; and 5), sealing the electric heating assembly after the high-temperature processing in the step 4). According to the method, the electric heating tube is pre-started for preheating; hydrate in magnesium oxide powder is decomposed by employing heat generated by the resistance wire itself, then the high-temperature processing is carried out, so water in the magnesium oxide powder is eliminated completely, and the normal working of the electric heating tube will not be influenced.

Description

technical field [0001] The invention relates to a manufacturing method of an electric heating tube assembly for preheating treatment of surface enamel. Background technique [0002] 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. During the production process of the electric heating tube, the dryness of the magnesium oxide powder used as the filler will affect the subsequent heat conduction and affect the efficacy of the electric heating tube. For this reason, it is often necessary to perform moisture removal treatment, while in the prior art, it is often Neglecting magnesium oxide hydrate and magnesium oxide containing crystal water will result in incomplete moisture removal, ...

AI Technical Summary

Problems solved by technology

During the production process of the electric heating tube, the dryness of the magnesium oxide powder used as the filler will affect the subsequent heat conduction and affect the efficacy of the electric heating tube. For this reason, it is often necessary to perform moisture removal treatment, while in the prior art, it is often Ignoring magnesium oxide hydrate and magnesium oxide containing crystal water will result in incomplete moisture removal, and such substances will also affect the conversion efficiency of electric heating tubes