VACUUM MELTING FURNACE FOR INFRARED GLASS AND MELTING SYSTEM AND METHOD THEREOF

摘要

A vacuum melting furnace for infrared glass, includes an upper furnace body and a lower furnace body that can be connected with each other or isolated from each other. Vacuum melting of the infrared glass is achieved in the upper furnace body wherein the influence of water in the environment is eliminated. The vacuum negative pressure environments can promote separation of hydroxyl in the structure, which achieves removing of hydroxyl in the glass, and then discharging of the molten infrared glass is conducted at atmospheric pressure in the lower furnace body. By using the vacuum melting furnace for infrared glass, infrared glass with good spectrum transmission performance can be obtained with improved property stability and optical homogeneity, which facilitates the preparation and molding of large sized and special-shaped infrared glass products.

主权项

1. A vacuum melting furnace for infrared glass, comprising
a furnace body, comprising an upper furnace body and a lower furnace body located below said upper furnace body; a bottom portion of said upper furnace body being in connection with a top portion of said lower furnace body via a communication passage; said furnace body being provided with a lockable furnace door, and being provided with a heater on a sidewall thereof; a vacuum pumping device in connection with said upper furnace body and said lower furnace body respectively; a crucible arranged inside said furnace body; a lifting device arranged in connection with said crucible and adapted to drive said crucible to move up and down within said furnace body; said communication passage having a dimension adapted to allow said crucible to pass through; and a stirrer arranged inside said upper furnace body and adapted to extend into said crucible for stirring as said crucible moves up into said upper furnace body; wherein, said communication passage is provided with a gate valve thereon for isolating said upper furnace body from said lower furnace body, and said lower furnace body is provided with a charging port thereon.