| 摘要 |
PURPOSE:To stabilize the internal temperatures of a preheating furnace and a heating furnace, improve the yield and achieve energy saving by installing a switch door in the joint area between the preheating furnace and the heating furnace. CONSTITUTION:A switch door 9 is installed in a joint area 8 between a preheating furnace 2 and a heating furnace 3. The switch door 9 is of the double type and is attached to a hollow operation shaft 10. It is opened by rotating the operation shaft 10 in A and B directions and closed by rotating them in direction reverse to the B direction. Glass bulbs 4 located on the front side of the outlet of the preheating furnace 2, when the switch door 9 opens according to the operation of the operation shaft 10, move in C direction before being stopped at a given position of the heating furnace 3. As a result, no convection occurs between the preheating furnace 2 and the heating furnace 3, the temperature gradient of the heating furnace 3 stabilizes and the crack generation and the defective circle formation of the glass bulbs 4 are decreased. |
