SU1622292A1 - Furnace for building up quartz blocks - Google Patents

Abstract

The invention relates to the production of electrofused materials and can be applied for the production of blocks of opaque quartz glass. The goal is to increase the yield of the product and reduce labor costs. In the working chamber 1, four heaters 2 are installed with arcuate screens 3. The heaters are connected in series by means of jumpers. The bottom 4 along the perimeter of the hole is rigidly connected to the upper part of the sliding shaft 5. In the trolley 6 a pallet 7 is installed, on which a quartz block 8 is located. Above the working chamber 1 a feeder 9 and an electric drive 10 are installed. The power source 11 serves to power the furnace. 2 Il.

Description

Ј1

F

/ V ////////////////////// S // S /// J //// // Fig1

Ј1

F

////////////////// S // S /// J // Fig1

The invention relates to the preparation of electrofused materials and can be applied to the production of blocks of opaque quartz glass.

The aim of the invention is to increase the yield of the product and reduce labor costs.

Figure 1 shows a furnace for depositing quartz blocks; figure 2 - working camera, front view in section.

In the working chamber 1, four heaters 2 are installed with arcuate screens 3. The heaters are connected successively via jumpers. The bottom 4 along the perimeter of the hole is rigidly connected to the upper part of the sliding shaft 5. In the trolley 6, a pallet 7 is installed, on which a quartz block 8 is located. Above the working chamber 1 a feeder 9 and an electric drive 10 are installed. The power source 11 serves to power the furnace ,, m the width of the extreme zone of melting, n - the width of the central zone of melting.

The furnace works as follows.

From the feeder, the source material enters the working chamber. The camera is electrically driven to its lowest position. The power supply is turned on and, as the block is being welded, the working chamber with heaters is raised, the shaft is raised by means of rigid attachment with the chamber, and the weld block with melted side surfaces comes out through the hole in the bottom. Since the connection of the bottom of the chamber and the shaft is hermetic, the contact of the source material with the side surfaces of the deposited block does not occur. Melting zones are only interheating gaps. At the end of the process of napsing a block of a given height, the supply of source material is stopped. The working chamber with the shaft is moved to the uppermost position, allowing the pallet truck and the unit to be rolled out from under the chamber. After cooling, the block is transported for further processing.

Example. A reconstructed industrial model was created and tested.

PS-75 resistance furnaces, allowing to obtain quartz blocks of 500x200x200 mm in size, weighing up to 40 kg. The model consists of a power source with a capacity of

60 kVA, electric drive, metal chamber size 600x400x200 mm with a hole in the bottom. The last perimeter of the hole is rigidly connected to a metal shaft lined with heat insulating material. Inside the shaft is a refractory pallet. Four graphite rods with a diameter of 20 mm and a length of 200 mm are installed in the chamber. The dimensions of the zones between the heaters are controlled according to the limits of the relations Ch: n 0.8-0.9. The speed of the camera lift is 90-100 mm / h.

Quartz sand is poured into the working chamber. When the circuit is closed

electric current passes through the heaters. The specific surface power of the heaters is 25-35 W / cm2. As a result, nearby layers of quartz sand are melting in the heater zone. As

deposition of the quartz block the camera is raised. The width of the central melting zone varies from 60 to 77 mm with the extreme melting zone of 60 mm and a heater diameter of 20 mm. The weight of the welded blocks is 40 kg. All blocks are examined for the percentage of cristobalite.

Claims (1)

Claims A furnace for fusing quartz blocks, including a case, a feeder mounted on it and four horizontal heating elements in it, protected from above by arcuate screens, the distance between the two central elements being greater than the distance between the central and peripheral elements. in order to increase the yield of the product and reduce labor costs, it is equipped a sliding chamber, the body is made with a bottom having a central opening for the fused block, and the sliding chamber is connected along the perimeter of the opening with the bottom. 0 Phil. 2