RU2703053C1 - Moulding device for glass hemispheres - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to a moulding device for glass hemispheres. Glass hemispheres moulding device comprises a heating chamber, a counterweight with a composite made up of a central part connected to the rod and an edge part with its position retainers, mechanism for raising and lowering the hearth by means of a rod connected to it, a vacuum system connected to the heating chamber, a heat shield mounted on the edge part of the composite hearth, made in the form of a truncated cone with a cap of a toroidal shape located on the upper part of the truncated cone, a plate limiting movement central part of hearth. On the central part of the hearth there is a moulding form with a glass workpiece located on it. Under the base of moulding form there installed is collector for forced cooling by compressed air of form base and glass workpiece, which is in form, made in the form of hollow torus from corrosion-resistant steel with holes along diameter of its inner surface.

EFFECT: faster process of moulding and power consumption.

1 cl, 2 dwg

Description

The invention relates to the building materials industry, in particular, to the field of production of bent products with parabolic or spherical curvature of the surface, used, for example, as reflectors for aerodrome approach signal lights.

Devices, furnaces, or horizontal installations of circular cross-section are usually used to bend such products, since this creates the most favorable conditions for uniform heating and cooling of both the bending form and the glass billet to be baked.

A known installation for molding glass hemispheres, comprising a heating chamber, vertically moving underneath with counterweights, a mechanism for raising and lowering the hearth by means of a rod connected to it and a vacuum system connected to the heating chamber by means of a flexible sleeve (DD Zheludkov Installation of molding glass hemispheres. Information sheet VIMI No. 86-2144, publ. 1986)

Closest to the invention is a glass hemisphere bending apparatus, comprising a heating chamber, vertically moving below with counterweights, made integral, consisting of a central part connected to the rod and an edge part with latches for its position, a mechanism for raising and lowering the hearth by means of a rod connected to it , a vacuum system connected to a heating chamber. A heat shield is installed on the edge of the composite hearth, made in the form of a truncated cone with a toroidal cover located on the top of the truncated cone, a plate restricting the movement of the central part of the hearth. (Patent RU No. 2554969, IPC С03В 23/025, publ. 07/10/2015)

A disadvantage of the known installation is that after the bending process is completed, with the bending form and glass work, they are lowered to the lowest position, where the glass work is slowly cooled under the influence of the environment to the glass hardening temperature, after which the glass work is removed from the mold.

The objective of the invention is to reduce energy consumption and reduce the time of bending due to forced cooling of the base of the mold and glassware in the mold.

This task is achieved by the fact that the proposed installation of a hemispherical glass molding, comprising a heating chamber, vertically moving under with counterweights, a mechanism for raising and lowering the hearth by means of a rod connected to it, a vacuum system connected to the heating chamber, a heat shield mounted on the edge of the composite hearth made in the form of a truncated cone with a toroidal cover located on the edge of the truncated cone, a plate restricting the movement of the central part of the hearth, characterized by that on the central part of the hearth a bending mold is installed with a glass blank located on it, under the base of which there is a collector for forced cooling of the mold base and glass blank in the mold with forced air, the collector is made in the form of a hollow torus made of corrosion-resistant steel with holes in diameter inner surface with a welded pipe, in the lower part of which a spring and rubber cuffs are installed between the washers. A pressure regulator is installed on the plate restricting the movement of the central part of the hearth.

The installation of a collector for forced cooling of the base of the mold and the resin glass work allows to reduce the process of cooling the glass work.

The proposed installation provides a significant reduction in energy consumption and a reduction in time during the bending process in comparison with the prototype.

FIG. 1 - Installation in the mode of glass bending (when the central part of the hearth is closed).

FIG. 2 - Installation in the cooling mode of glass work (when the central part of the hearth is open).

The installation comprises a heating chamber 1 with heaters 2 and a composite under, consisting of a central part 3 connected to the rod 4, and an edge part 5 with latches 6. A heating chamber 1 with heaters 2 and a composite under is mounted on a metal frame 7 with a mechanism 8 and counterweights 9 to move the rod 4 vertically from the extreme upper position of the center part 3 of the hearth (Fig. 1) to its lowest position (Fig. 2). On the central part of the hearth there is a bending mold 10 with glass billet 11. The working space between the bending form and glass billet is connected to the vacuum system 12 by means of a metal tube 13 located in the rod 4. On the edge part 5 of the composite hearth there is a heat shield 14 made in the form of a truncated cone , with a toroidal lid 15 located on the upper part of the heat shield 14. On the central part 3 of the hearth, under the bending form 10, a collector 16 is installed for forced cooling by compressed air of the mold base and glass workpiece in the form, made in the form of a torus of corrosion-resistant steel with holes in the inner diameter, with a welded pipe, in the lower part of which between the washers 17 is fixed a spring 18 and cuffs 19 and 20. On the plate 21, bounding the movement of the Central part of the hearth 3 mounted pressure regulator 22.

Installation works as follows.

After heating the chamber 1 (Fig. 1) to a glass softening temperature and holding for 30-40 minutes. the central part of the hearth is lowered to its lowest position (Fig. 2) using the mechanism 8 and counterweights 9. Next, a round flat glass blank 11 is placed on a mold 10 with predetermined geometric dimensions. Then, the central part of the hearth is raised to its highest position using the mechanism 8 and counterweights 9. After heating the glass blank to the softening temperature of the glass, air is evacuated from the space between the glass blank 11 and the forming surface of the mold 10 using a vacuum system 12 and a metal tube 13. Next, the central part the hearth is lowered to its lowest position (Fig. 2), while the manifold pipe 16 enters the hole of the pressure regulator 22, thanks to the cuffs 19 and 20, a tight connection is created As for the pressure regulator, the spring 18 is compressed, lifting the collector 16 upward, closer to the base of the bending mold 10. By opening the valve 23, compressed air passes through the pipe 24 to the manifold 16 and exits through the holes, thereby cooling the base of the bending mold and glass work, in shape.

After the milling process, the vacuum system 12 and the heaters 2 are turned off.

In connection with the installation of the collector for forced cooling of the base of the mold, the cooling time of the isolated glass billet to the glass hardening temperature is significantly reduced in comparison with the prototype.

Example: It is necessary to bend glass blanks intended for receiving reflectors used in approaching aerodrome light-signal lights. In this case, a mold with a height of 130 mm and a diameter of 250 mm is used. The installation has the following parameters: the diameter of the working space of the chamber 1 is 650 mm, the height is 400 mm, the diameter of the central part 3 of the composite hearth is 340 mm, the diameter of the truncated cone 14 in the lower part is 425 mm, in the upper part it is 390 mm, the diameter of the cover 15 in the lower part 430 mm, in the upper part 215 mm, the inner diameter of the manifold pipe is 180 mm with openings for the exit of compressed air with a diameter of 2.5 mm in increments of 20 mm, the outer diameter of the collector is 230 mm.

A batch of the above bent glass blanks was obtained according to the described example. At the same time, energy costs amounted to 80%, and the time of the process of bending 85% compared with the prototype.

Claims (1)

A glass hemisphere bending installation containing a heating chamber, under with balances, made integral, consisting of a central part connected to the rod and an edge part with fixators of its position, a mechanism for raising and lowering the hearth by means of a rod connected to it, a vacuum system connected to the camera heating, a heat shield mounted on the edge of the composite hearth, made in the form of a truncated cone with a toroidal cover located on the top of the truncated cone, a plate bounding moving the central part of the hearth, characterized in that on the central part of the hearth a bending mold is installed with a glass blank located on it, under the base of which there is a collector for forced cooling with compressed air of the mold base and glass blank in the mold, made in the form of a corrosion-resistant hollow torus steel with holes along the diameter of its inner surface.

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