Heating device and method for processing rolling edges on heating device

Abstract

The invention relates to a heating device and a method for processing rolling edges on the heating device. The heating device is characterized by comprising an inner copper sleeve, an outer steel cylinder, an electric heating wire, a temperature measuring wire and a limit block, wherein the inner hole of the inner copper sleeve is a sleeving hole, the inner copper sleeve is provided with an expansion joint, an inner giving-way hole slot and a winding slot; the inner hole of the outer steel cylinder is an embedding hole, the outer steel cylinder is provided with an outer giving-way hole slot, the inner copper sleeve is embedded in the embedding hole and enables the inner giving-way hole slot to be communicated with the outer giving-way hole slot, two ends of the outer steel cylinder are respectively bent to form rolling edges, the rolling edges are pressed against the corresponding end faces of the inner copper sleeve, and the outer wall of the outer steel cylinder is provided with a through hole running to the expansion joint; the electric heating wire is wound in the winding slot; the temperature measuring wire is hidden and embedded in the expansion joint; and the limit block isembedded in the expansion joint. The heating device has the advantages of simple structure, convenient assembly, high structural strength, small thermal energy damage and the like; and the method forprocessing rolling edges on the heating device has the advantages of simplicity, reliability, high manufacturing efficiency and the like.

Description

technical field [0001] The invention relates to a heating device applied to a hot runner system and a processing method of the heating device. Background technique [0002] At present, the heating devices used in the hot runner system are mostly composed of copper sleeves and electric heating wires, wherein the electric heating wires are arranged on the inner wall of the copper sleeve. In order to ensure the reliability of the direct heat transfer between the heating device and the heated tube, the copper sleeves are mostly tightly fitted on the heated tube. And in order to make the heated pipe on the copper sleeve, in the process of the copper sleeve, it is often necessary to knock the end face of the copper sleeve, so that the copper sleeve can be placed on the heated pipe. Since the copper sleeve is made of copper, its texture is relatively soft, and it is easy to deform during the knocking process, which may even cause the copper sleeve to fail to fit on the heated tube...

AI Technical Summary

Problems solved by technology

Since the copper sleeve is made of copper, its texture is relatively soft, and it is easy to deform during the knocking process, which may even cause the copper sleeve to fail to fit on the heated tube, and this will easily affect the heating device. Performance and aesthetics

At the same time, during the working process of the electric heating wire, the heat generated by it will be conducted to the copper sleeve, which will cause the copper sleeve to expand when heated.

Because the thermal expansion and contraction of the copper sleeve made of copper change greatly, when the electric heating wire is working, it will cause a large gap between the copper sleeve and the heated tube, which will cause a gap between the copper sleeve and the heated tube. Gaps are generated, which in turn will lead to a decrease in heat conduction performance, which will affect heating efficiency and lead to energy loss

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