Electrothermal film glass tube preheating device

Abstract

The invention discloses an electrothermal film glass tube preheating device. The electrothermal film glass tube preheating device comprises two conveying belts. A metal net is arranged between the two conveying belts. A treatment cavity is divided into a preheating cavity and a heating cavity through a partition plate. The two conveying belts movably penetrate through the preheating cavity and the heating cavity. Multiple hot air tubes are arranged on the upper section of the preheating cavity, and air nozzles of the hot air tubes are right opposite to the metal net. Two upper air tubes are arranged in the heating cavity, multiple lower air tubes are arranged in the heating cavity, flow baffles are arranged between the two upper air tubes and the upper surface of the metal net, multiple flow guide holes are formed in the flow baffles, and the internal diameters of the flow guide holes are gradually increased from top to bottom. Aiming at the problems that in machining procedures of heating tubes in the prior art, when glass tubes are softened, local heating is likely to be not uniform, and therefore the viscosity between electrothermal films and the glass tubes is low during spraying, a preheating device specially used before spraying of the glass tubes is designed, high matching between the glass tubes and the electrothermal films during spraying is guaranteed, and then the heating efficiency of the heating tubes is guaranteed.

Description

technical field [0001] The invention relates to the field of electrothermal film processing, in particular to an electrothermal film glass tube preheating device. Background technique [0002] The electrothermal film on the outer wall of the heating tube is a raw material made of various metal salts according to a certain proportion. The thickness of the complex semiconductor film is only a few microns or tens of microns, but its performance is very good. This kind of film is formed in the state of fine particles and combined with the substrate, which is very firm and will not fall off. The surface of the film is relatively hard and very wear-resistant. Among them, the heating principle of the glass-coated heating tube: the glass-coated heating tube is a layer of doped oxide film formed on the surface of the insulating substrate by dipping, thermal spraying, evaporation and magnetron sputtering. Electrodes are placed on the film layer to form a heating element. However, t...

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Problems solved by technology

In view of the processing procedure of heating tubes in the prior art, when the glass tube is softened, it is prone to local uneven heating, so that the viscosity between the electrothermal film and the glass tube is low during spraying. The applicant designed a A preheating device specially used for glass tubes before spraying to ensure that the glass tubes are highly compatible with the electrothermal film during spraying, thereby ensuring the heating efficiency of the heating tubes;

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