RU2636607C1 - Apparatus for bending glass hemispheres - Google Patents

Abstract

FIELD: chemistry.SUBSTANCE: apparatus for bending glass hemispheres contains a heating chamber, vertically moving under with counterweights, a hoisting and lowering hearth mechanism by means of attached rod, a vacuum system connected with the heating chamber, and a heat shield mounted on the outer part of the composite hearth made in the form of a truncated cone with a lid of the toroidal shape, located on top of the truncated cone, a plate restricting the movement of the central part of the hearth. The apparatus is equipped with a flap with a spherical curvature of the surface, made of heat-resistant steel. A telescopic rack is installed on the plate outside the zone of bending, in the upper part of which a yoke is installed on the axis with a retainer and a guide with the slot, ensuring the flap rotation. In the guide there is a rod with a rotary handle, the other end of the rod is connected to the flap guide and the central part of the flap by means of a pressure spring strip.EFFECT: reduction of bending time.3 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 as reflectors for aerodrome light-signal approach 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 device for glass molding is known, comprising a furnace mounted with the possibility of vertical movement of its arch and side parts relative to the shape of the molding located on the stationary hearth of the furnace according to St. SU No. 511300, С03В 23/02, publ. 04/25/1976.

A disadvantage of the known device is that after heating the furnace and the bending form located in it to the glass softening temperature, its arch and side parts are raised to their highest position to place the flat glass workpiece on a heated form that is outside the space of the furnace. During this period of time there is a large heat loss both in the working space of the furnace and from the hearth with a bending shape. In addition, in the process of bending glass workpieces with a parabolic or spherical curvature of the surface, the need almost always arises for correcting (eliminating the skew) the position of the glass work pieces relative to the forming surface of the bending mold. In this case, it is necessary to raise the arch and side parts of the furnace again to their highest position. The above factors lead to high energy costs and increase the time of the bending process.

A known installation for molding glass hemispheres, containing a heating chamber, vertically moving below 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 (Zheludkov D.D. Installation of molding of glass hemispheres. Information sheet VIMI No. 8662144, published in 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, the mechanism for raising and lowering the hearth by means of a rod connected to it , a vacuum system, and on the edge of the composite hearth there is a heat shield made in the form of a truncated cone with a toroidal shape located on the upper part of sectional cone, a plate restricting the movement of the central part of the hearth according to patent RU No. 2554969, IPC С03В 23/025, publ. 07/10/2015.

A disadvantage of the known installation is that after heating the chamber and the bending mold located on the central part of the hearth to the softening temperature, the glass is lowered to its lowest position in order to place a flat glass blank on the mold, which together with the hearth is outside the space of the heating chamber. During this period of time, a large heat loss occurs both in the working space of the chamber and from the hearth with the mold. In practice, in the process of bending glass workpieces with parabolic or spherical curvature, it is necessary to correct (eliminate skew) the position of the glass workpieces relative to the forming surface of the mold one or more times. In this case, it is necessary to lower the under again with the form located on it to the extreme lower position. All of the above factors lead to high energy costs and increase the time of the bending process.

The objective of the invention is to reduce energy consumption and time of the process of bending glass.

This task is achieved by the fact that the proposed installation of molding glass hemispheres from flat glass blanks, containing a heating chamber, under counterweights, made integral, consisting of a Central part connected to the rod, and the edge part with the clamps of its position, the mechanism for raising and lowering the hearth through the connected with it a rod, 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 shape, distributed laid on the upper part of the truncated cone, a plate restricting the movement of the hearth central part, according to the invention, the installation is equipped with a shutter with a spherical curvature of the surface made of heat-resistant steel, a telescopic stand is installed on the plate outside the milling zone, in the upper part of which there is a beam with a clamp and a guide with a slot for turning the damper; a rod with a rotary handle is installed in the guide; the other end of the rod is connected to the guide of the damper and the central astyu flap by the presser spring strip, the two guide rod and provide reciprocating motion damper.

The installation of a damper in the opening of the edge part of the composite hearth ensures that the specified temperature is maintained in the working space of the furnace when flat glass work is installed on the bending mold, corrected during bending, when the mold is cooled with the finished (resin) glass work, and the glass work is removed from the mold. The spherical curvature of the shutter allows you to easily install on the mold, make corrections, and remove glass blanks from the mold.

Before lifting the central part of the hearth with the bending shape and the flat glass blank placed on it in the upper position, the shutter is withdrawn from the opening of the edge part of the hearth for its dimensions. Raise the central part of the hearth to the upper position - thermal stabilization of the working space of the furnace and glass is faster than the prototype.

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

FIG. 1 - the position of the valve in the initial state when the furnace is heated and the shape of the bending.

FIG. 2 - the position of the shutter when installed on a flat glass blank form, its correction during bending, when cooling the resin glass blank and removing it from the mold.

FIG. 3 - the position of the shutter during bending glass.

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 to its lowermost position. On the central part of the hearth there is a bending mold 10 with glass blank 11. The working space between the mold and the glass blank 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 cover 15 of a toroidal shape. A telescopic rack 17 is fixed on the plate 16. Studs 18 are mounted in the rack for fixing the latch 26. In the upper part of the rack on the axis 19 there is a rocker 20. A latch 26 of the positions of the shutter 21 and a guide 22 with a slot, in which the rod 23 with a rotary shaft is mounted, is fixed to the beam. handle 24. A pressure spring band 25 with a handle connected to the center of the shutter 21 and a guide of the shutter 27 are attached to the other end of the stem. The thrust catchers 28 of the shutter 21 are attached to the base of the edge portion 5 of the composite hearth. A hook 29 is mounted on the side of the heating chamber 1, fixing the shutter 21 in its initial position.

Installation works as follows.

After heating the chamber 1 and the mollyation form 10 located therein with the lid 11 (Fig. 1) to a glass softening temperature and holding for 30-40 minutes. the central part 3 of the hearth is lowered to the lowermost position (Fig. 2) using the mechanism 8 and the balances 9. The edge part 5 of the hearth is fixed relative to the frame 7 using the clips 6. Vacuum rod remove the cover 11 from the shape of the molding 10. The opening of the edge part 5, the hearth is closed by a shutter 21 (Fig. 2) using persistent catchers 28 and a retainer 26. Next, a round flat glass blank 11 is placed on the bending mold 10, the retainer 26 is disengaged from the studs 18, the handle 24 of the rod 23 is used to shut the shutter 21 out of the edge opening part 5 of the hearth, the latch 26 is installed between the studs 18, raise the Central part 3 of the hearth to its highest position using the mechanism 8 and the balances 9 (Fig. 3). After heating the glass blank to a glass softening temperature, air is sucked out from the space between the glass blank 10 and the forming surface of the mold 11 using a vacuum system 12 and a metal tube 13. After the bending process is completed, the vacuum system 12 and the heaters 2 are turned off.

In connection with the rapid stabilization of the temperature in the working space of the furnace where the bending mold 10 is located, due to the opening of the edge part 5 under the shutter 21 during the installation of the glass blank 11 on the mold, correction of the glass blank relative to the forming surface of the mold during milling, cooling of the smoked glass blank, time heating the glass to a softening temperature of the glass is significantly reduced compared with the prototype.

Example: It is necessary to bend glass blanks intended for the manufacture of reflectors used in proximity aerodrome 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 diameter of the damper 21 - 390 mm, the arrow of deflection of the damper - 120 mm. A batch of the above bent glass blanks was obtained. At the same time, energy costs amounted to 60%, and the time of the process of bending 65% in comparison with the prototype.

The use of this device will reduce energy costs and speed up the bending process.

Information sources

1. Auth. St. SU 1300, IPC С03В 23/02, publ. 04/25/1976.

2. Zheludkov D.D. Glass hemisphere bending installation. VIMI Information Leaflet No. 386-2144, publ. 1986.

3. Patent RU No. 2554969, С03В 23/025, publ. 07/10/2015.

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 the installation is equipped with a shutter with a spherical curvature of the surface made of heat-resistant steel, a telescopic stand is installed on the plate outside the milling zone, in the upper part of which there is a rocker arm with a clamp and a guide with a slot, which allows the shutter to rotate, a rod with a rotary handle is installed in the guide, the other end of the rod is connected to the damper guide and the central part of the damper by means of a pressure spring strip, both of which the ravers and the stem provide reciprocating movement of the damper.

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