Glass flow control device and method for prolonging service life of glass flow control device

Abstract

The invention provides an erosion-resistant and high-strength glass flow control device during float glass production. The glass flow control device comprises a flashboard and a platinum rhodium alloy layer wrapped on the surface of the flashboard. The platinum rhodium alloy layer is wrapped on the flow control flashboard, so erosion of glass liquid on the flashboard can be effectively improved and the service life of the flashboard is prolonged; an elastic device is provided, so that the platinum rhodium alloy layer expands upwards integrally, the flashboard is tightly contacted with the platinum rhodium alloy layer and the platinum rhodium alloy layer is difficult to bubble; and the channel space atmosphere near the upper part of a liptile is controlled, so that the platinum rhodium alloy layer is prevented from forming alloy with other possible metal simple substances at high temperature, the structure of the platinum rhodium alloy layer is not damaged, and mechanical strength and service life of the platinum rhodium alloy layer are not influenced.

Description

technical field [0001] The invention relates to a flow control device in the float glass production process, in particular to a flow control gate and a method for prolonging its service life. Background technique [0002] At present, in the production of float glass, in order to control the output of glass, it is necessary to add one or more flow control gate devices on the channel between the melting furnace and the tin bath. In the float glass industry, refractory materials with extremely small thermal expansion coefficient and good thermal shock resistance are generally used as the material for the gate, such as fused quartz, etc., and the material is made into a rectangular parallelepiped structure by using the existing molding technology. The bottom is smooth and arched to improve the quality of the glass surface and prevent bubbles and other defects. [0003] During normal production, the gate plate moves up and down slowly by adjusting the transmission device to stab...

AI Technical Summary

Problems solved by technology

However, since the melting point of gold is 1064°C and the melting point of platinum is 1769°C, the composition of platinum alloys above 1100°C will change in composition, and gold will preferentially volatilize from the alloy and form a thin layer of gold-rich alloy on the surface, resulting in changes in the alloy structure. The mechanical strength decreases; due to the difference between the metal expansion coefficient and the refractory material, it may also cause bubbling at the contact between the gate material and the platinum alloy at high temperature, and even lead to cracking of the alloy in severe cases

In addition, since the gate is located close to the side of the tin bath, the protective gas used for molding is slightly reducing, which may cause the tin oxide and stannous oxide formed around the gate to be reduced to simple tin under the action of reducing gas. And form an alloy with the gold-rich layer, destroying the platinum alloy structure

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