RU2064457C1 - Sheet-type glass bending and hardening - Google Patents

Abstract

FIELD: glass production, small series production of hardened glasses for motor cars and other transportation means. SUBSTANCE: to decrease power consumption and to have capability of readjustment for any type glass production aggregate has horizontal heating electrical furnace with heating have capability of readjustment for any type glass production aggregate has horizontal heating electrical furnace with heating members made in the form of separate sections mounted on insulated panels incorporated in electrical scheme so, that to be capable to adjust temperature created by each section. Bending-hardening apparatus made in the form of glass mollifying and provided with wheels mounted on rails laid in furnace and in cooling apparatus. Cooling apparatus is made in the form of two located with clearance blowing lattices of sectional type, that are made as separate sectors hinged to each other. Each sector has set of case-type collectors with nozzles. Heating members are mounted on insulating panels with clearance between the members and panel. Panels are also mounted with clearances between them. EFFECT: decreased power consumption, improved capability for readjustment to produce any type of glass. 3 cl, 6 dwg

Description

 The invention relates to the glass industry and is intended for the manufacture of tempered glasses in small-scale production in the repair of automobiles and other vehicles.

Known chamber electric resistance furnace for molding solid glass or a knife frame, made in the form of a metal frame, inside of which there is a working chamber made of fireclay chamotte plates with grooves for placing electric heaters, two additional local heaters are suspended above the sections of the maximum bend of the glass inside the chamber [1]
This furnace is a massive structure, has a thick refractory masonry, made with curly grooves for laying electric heaters and for a bunch of refractory plates together. Due to the massiveness of the refractory masonry, it has a large heat capacity, it takes a long time to raise the temperature, and therefore a large electricity consumption. The furnace has a large inertia, which complicates the repair and leads to large losses of working time.

Known cooling device, including the upper and lower blowing grilles sectional type, connected to a blower or compressor [2]
In this device, the blower grilles are made of hemispheres of constant radius and it is possible to regulate only the air gap depending on the thickness of the glass. When cooling glass with a different bending radius other than the bending radius of the blowing grates, it is impossible to achieve uniform blowing and cooling of the glass.

 A chamber electric furnace and a cooling device are components of the installation for bending and tempering sheet glass, which has the disadvantage that it is energy-intensive, massive, and cannot be quickly reconfigured to different glass sizes.

 To reduce the energy consumption and the possibility of reconfiguring to any size of glass in the installation for bending and tempering sheet glass containing a chamber electric furnace and a cooling device, including the upper and lower blowing grates of the section type, the heating elements of the furnace are made in the form of separate sections mounted on insulating panels, included in the electrical circuit with the ability to control the temperature created by each section, and sections of the blowing grates are assembled in separate sectors connected between themselves oh hinges.

 The heating elements are installed with a gap between them and the insulation panels, and the latter are also installed with gaps between them.

 The heating elements are interconnected sequentially in separate circuits of the hearth and ceiling parts, each circuit is divided into at least two parts, which are interconnected via an adjustable resistor.

 Sections of blowing grates contain at least three sectors each.

 Figure 1 presents the General installation diagram for bending and hardening of sheet glass; figure 2 section aa in figure 1; figure 3 section BB in figure 1; figure 4 panel with electric heating elements; figure 5 - electrical circuit of the furnace; figure 6 installation diagram of the panels.

 Installation for bending and tempering sheet glass consists of a horizontal heating furnace 1, a cooling device 2 with a supercharger 3, a carriage 4 with a form for glass bending, mounted by wheels 5 on the rails 6. The electric furnace 1 is hinged on the racks 7 and contains a loading door with an inspection eye 8. Electric heating elements (TEN) 9 are mounted on separate insulating panels 10 with an air gap between the TENs and the panel, the latter are installed on the hearth and ceiling parts of the furnace with thermal gaps l between themselves . Heating elements are interconnected sequentially in independent schemes of the hearth and ceiling parts. Each circuit is divided into at least two parts, which are interconnected via an adjustable resistor 11.

 The cooling device 2 is made of upper 12 and lower 13 blowing grates assembled from box-shaped manifolds 14 with nozzles 15. The collectors 14 are assembled in separate sectors interconnected by hinges 16 and connected by an air duct 17 to a supercharger 3.

 Glass cut according to the template, for example for a car, with a thickness of 5-8 mm is laid on the shape of the carriage 4 and rolled along the rails 6 into the furnace 1 through the loading door. Through the inspection hole 8 are monitoring the process of heating the glass. Upon reaching the temperature at which the glass becomes plastic, it bends under its own weight and falls onto the surface of the mold, which is immediately rolled out of the furnace and placed in the cooling device 2. When the glass size is changed, uniformity of blowing with cold air is ensured by the relative position of the sectors of the blowing grates.

 When changing the glass sizes, the thermal regime of the furnace is changed by adjusting the resistance of the resistor 11.

 The insulation panels 10 are fixed by the struts 18 to the furnace frame and at the same time, the posts 18 are fasteners of thermal insulation to the furnace frame.

 The use of insulating panels allowed the thermal insulation of the furnace to be made lightweight, using for this purpose tiles of powdered heat-insulating material with a small amount of refractory cement. As a result, the heat capacity of the furnace, the heating time (not more than 15 minutes), and the inertia sharply decreased, which significantly reduces the time required to repair the furnace, the weight of the furnace and the power consumption decreased.

Claims (3)

 1. Installation for bending and hardening of sheet glass, containing a chamber electric resistance furnace and a cooling device including upper and lower blowing gratings of section type, characterized in that the heating elements of the furnace are made in separate sections mounted on insulating panels included in the electrical circuit with the possibility regulation of the temperature created by each section, and sections of the blowing gratings are assembled in separate sectors interconnected by hinges, while the heating elements They are mounted with a gap between them and insulation panels, and the latter are also installed with gaps between them.  2. Installation according to claim 1, characterized in that the heating elements are interconnected sequentially in separate circuits of the hearth and ceiling parts, each circuit is divided into at least two parts that are interconnected via an adjustable resistor.  3. Installation according to claim 1, characterized in that the sections of the blowing grates contain at least three sectors each.

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