Overflow groove heating device and muffle furnace

Abstract

The invention provides an overflow groove heating device and a muffle furnace, which can ensure the uniformity and stability of a space temperature field, improve the production quality, prolong the service life of equipment and reduce the production cost. Comprising baffles arranged at the two ends of an overflow groove, the sides, making contact with molten glass flowing out of the overflow groove, of the baffles are arranged in a bent mode and used for changing the flowing direction of the molten glass, and a heater is installed on the other sides of the baffles; the heater is divided into an upper section and a lower section according to the position where the flowing direction of the molten glass changes, and the upper section and the lower section adopt heaters with different resistivity.

Description

technical field [0001] The invention relates to the technical field of flat glass production, in particular to an overflow tank heating device and a muffle furnace. Background technique [0002] With the increasing use of devices with various flat-panel display functions such as notebook computers and smartphones, the market demand for flat-panel substrate glass for manufacturing flat-panel displays has increased significantly. At the same time, due to the use of large-size flat panel displays, higher and higher requirements are put forward for parameters such as the size, flatness and internal stress of the flat substrate glass. Based on such a sharp increase in demand, the overflow down-draw method plays a pivotal role in the production of flat substrate glass. [0003] In the production process of the overflow down-draw method, it depends heavily on the precise control of the size of the overflow tank and the space temperature field in the production process. Larger, re...

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Problems solved by technology

[0003] In the production process of the overflow down-draw method, it depends heavily on the precise control of the size of the overflow tank and the space temperature field in the production process. Larger, resulting in inevitable deposition of precipitates; at the same time, the flow state of the glass in the baffle area will change the flow state (due to the downward flow of the molten glass, the temperature of the surface of the molten glass decreases, and the molten glass receives surface tension, gravity, etc. and the infiltration of the baffle, the change of the flow state of the molten glass is also one of the main causes to induce precipitates), resulting in the change of the flow state in the baffle area, that is, in the baffle area over time, the glass liquid It is easy to produce some analytes to adhere to the baffle, further deteriorating the flow state

unfavorable to production

In the end, the adjustment of the plate thickness cannot be guaranteed, and the overall equipment life is shortened

Adverse effects that lead to a substantial increase in production costs

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