PLATE GLASS PREHEATING METHOD FOR TEMPERED GLASS MANUFACTURING DEVICE AND HEATER INSTALLATION STRUCTURE IN FURNACE USED FOR HEATING PLATE GLASS

摘要

The present invention relates to a plate glass preheating method for a tempered glass manufacturing device and a heater installation structure in a furnace used for heating the plate glass. In a plate glass preheating method, in a procedure for raising the temperatures of preheating furnaces to predetermined temperatures in a stepwise manner and thus preheating plate glass mounted on a jig in a tempered glass manufacturing device, preheating furnaces are classified into a primary preheating furnace (410) and a secondary preheating furnace, primary preheating is completed in the primary preheating furnace (410), then plate glass (110) is transferred to the secondary preheating furnace and secondary preheating is performed. In the primary preheating furnace (410), temperature is repeatedly raised and maintained in a stepwise manner three times from room temperature to 200°C, and in the secondary preheating furnace, temperature is repeatedly raised and maintained in a stepwise manner three times from 200°C to 380°C, thereby performing the preheating. The inner walls of each furnace are partitioned such that a plurality of areas can be divided by means of assembly, a support body (420), having a form of a unit assembly in accordance with the size of the partitioned inner walls of each furnace, is provided, and a heater (421) is consecutively fixed on the support body (420).