Reverse bending type glass hot-bending furnace

Abstract

The invention discloses a reverse bending type glass hot-bending furnace which comprises a preheating box and a hot-bending furnace. A hot-bending mold is arranged on a support block; a fixed heatingwire plate is arranged above the hot-bending mold; local telescopic heating devices are symmetrically arranged on inner side walls, close to the fixed heating wire plate, of a hearth; each local telescopic heating device comprises a screw rod; a driven bevel gear is connected with a worm wheel through a connecting rod; the worm wheel is movably arranged on a worm; one side, far away from a rotaryrod, of the worm is connected with the screw rods through connecting blocks; the screw rods penetrate through an operation plate; and a movable heating wire plate is arranged on an extending rod. According to the reverse bending type glass hot-bending furnace provided by the invention, through the built-in preheating box, glass can be fully preheated before hot-bending, so that the hidden danger that the glass is ruptured due to shock heating in the hot-bending chamber is eliminated; and multiple local telescopic heating devices are arranged in the hot-bending furnace, so that the deep-bendinghot-bending glass is promoted to be fit to the mold under the traceless state, and the hot-bending accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of glass processing, in particular to a reverse-bending glass hot-bending furnace. Background technique [0002] Glass bending furnace is a device that heats and softens flat glass in a mold, and then anneals it to make curved glass. The glass needs to be preheated before bending to prevent the glass from heating up too fast in the furnace, resulting in uneven heating. However, glass bursting occurs; deep curved glass must be fired by reverse molding. When the glass is formed, if excessive external force is used to press the glass to help the glass form, it will cause obvious traces on the glass, so it is necessary to control the glass by adjusting the temperature as much as possible. Therefore, the hot bending furnace must have a local heating device to make the glass fit the mold better. [0003] In the prior art, a glass bending furnace with the application number "201720739937.X" includes a fixed frame ...

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Problems solved by technology

[0004] However, there are still obvious defects in its use: 1. Without a preheating box, the temperature rise rate of the glass in the hot bending furnace is too fast, which may easily cause the glass to be heated unevenly in the furnace, and the glass may burst , the scrap rate is high; 2. Lack of local telescopic heating device, the forming of deep-bending hot-bending glass cannot be assisted by excessive external force, otherwise it is easy to produce traces, so an adjustable local telescopic heating device is needed to make the glass can be consistent with the mold Matching, improving the precision of hot bending

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