Soaking cover

Abstract

The embodiment of the invention provides a soaking cover which is used for heating and preserving heat of molten glass flowing on a forming template, the soaking cover comprises a circular ring heater, a hanging bucket and a temperature control system, the hanging bucket is hung above the forming template, and the lower surface of the hanging bucket is parallel to the forming template, so that the surface of the molten glass is vertically heated; during vertical heating, heat is in a vertical plane downward radiation state, so that molten glass on the forming template can be radiated, and meanwhile, the heat of the molten glass can be prevented from being radiated upwards and excessively lost; the circular ring heater is arranged on the lower surface of the hanging barrel, and a plurality of annular heating areas are sequentially formed on the circular ring heater from the center to the edge of the circular ring heater; the temperature control system comprises a plurality of temperature controllers, each temperature controller is connected with one corresponding heating area so as to control the temperature of the corresponding heating area, and each temperature controller controls the corresponding heating area to keep the same temperature according to the temperature field requirement, so that the temperature field uniformity in the ultra-low expansion glass ceramic forming process is ensured.

Description

technical field [0001] The present application relates to the technical field of ultra-low expansion glass-ceramic molding, and in particular, to a heat soaking cover. Background technique [0002] This section provides background information related to the present disclosure only and is not necessarily prior art. [0003] The molten glass that has been melted and clarified is directly flowed into the forming template through the leakage tube to form a large-sized glass plate. Within the range, it is necessary to heat and keep warm at the front interface of the liquid glass flow and the surface of the liquid glass. [0004] In the related art, a silicon carbide rod is generally used as a heating element to make a heating mantle for forming a traditional large-size optical glass. The lower part of the heating mantle is exposed to the air without heat preservation measures, and the silicon carbide rod is a straight rod type heating element. The temperature is high, the edge ...

AI Technical Summary

Problems solved by technology

[0007] The soaking hood of the embodiment of the present application includes a ring heater, a bucket and a temperature control system. Because the bucket is hung above the forming template and the lower surface of the bucket is parallel to the molding template, the ring heater can be arranged on the lower surface of the bucket so that The ring heater is parallel to the surface of the forming template, so as to realize vertical heating on the surface of the molten glass. When vertically heating, the heat is radiated downward in a vertical plane, which can radiate the molten glass on the forming template, and at the same time block the heat of the molten glass upwards. Excessive radiation loss; from the center to the edge of the ring heater, a plurality of ring-shaped heating zones are sequentially formed on the ring heater, respectively connected to multiple temperature controllers in the temperature control system, each temperature controller according to The temperature field requires that the corresponding heating zones be controlled separately to maintain the same temperature, thereby effectively ensuring the uniformity of the temperature field during the forming process of ultra-low expansion glass-ceramics, and solving the problem of ultra-low expansion glass-ceramics caused by uneven heating of glass liquid in related technologies. High-quality molding of ultra-low-expansion glass-ceramics is realized by solving the problem of large internal stress in the glass

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