SU33655A1 - Method of drawing glass tubes or drafts - Google Patents

Description

In a conventional Danner method, when glass tubes and mallets are drawn, molten glass flows into an inclined rotating nozzle, which is placed in a heated chamber and into which, if necessary, air can be blown. The glass flowing down from the rotating nozzle is drawn into the tube or, in the absence of air entering the nozzle, into the stick. To obtain shaped section tubes, a Schott method is known, in which shaped-shaped nozzles are used.

In the proposed method of drawing tubes and drums, both round and figured outlines from molten glass, the glass is delivered in the same way as in the above methods to an inclined rotating nozzle of a corresponding section placed in a heated chamber, but leaving the latter, in order to prevent it from twisting, it is rotated in the same direction and with the same speed as the nozzle, for which the product is passed through a rotating holder of the corresponding section.

The method is illustrated in a schematic drawing in which FIG. I depicts a vertical sectional view of a device for pulling tubes and drafts; FIG. 2 is a detail of the nozzle and FIG. 3 is a scheme for changing the angle of the nozzle.

Flowing out of the furnace / molten glass 13 (Fig. 1) flows through the valve 6 into the tube 75, the end of which is enclosed by a conical body 8 made of fireclay, which is integral with a rotating obliquely mounted nozzle 9 having channels: 10 and 16 for air suction and an annular forming gap 1b of one or another section. The tube 75 and the nozzle 9 are enclosed in a chamber 5 heated by a nozzle 4. In view of the rotation of the nozzle 9, the glass drawn out of the forming gap 16a will also be rotated into the tube to prevent the soft glass tube from twisting, the latter in the proposed method it is also made to rotate in the same direction and at the same speed as the nozzle. For drawable glass tube

pass through the yoke 17 of the corresponding section, which is driven by the gears 18 and 19 in rotation. The rotary tube 12 then enters the / 7 conveyor.

The change in the inclination of the nozzle is made using the actuator 29 (Fig. 2); in this case, if the nozzle 9 needs to be brought into a horizontal position, then the shaft 20 with gears 19 and 23. leading to rotation the nozzle 9 and the yoke 77 rises, being mounted together with the motor 21 on the lifting platform (Fig. 3). For raising and lowering the latter are serrated rake 27 and gear 28.

The subject matter of the invention.

A method of drawing out glass tubes or drums, a circular or shaped section of molten glass, which enters a rotating inclined nozzle placed in a heated chamber, characterized in that the products being pulled out, in order to prevent them from twisting, are passed through a rotating rotating frame in the same direction and at the same speed as the forming nozzle.