Device for producing a glass rod

摘要

The invention relates to a device for producing a glass rod. The device comprises a Danner blowpipe (1); a nozzle for applying stream of glass to the surface of the Danner blowpipe (1) at one end of said blowpipe (supply end) at a relatively high temperature in order to form a glass film, which is removed at the other end (discharge end) in the form of a bulb at low speed. According to the invention, the device is characterised as follows: the Danner blowpipe (1) is constructed as follows: the peripheral wall consists of an external metal jacket (2) and a ceramic body (3) surrounded by said jacket; a respective clamping plate (6.1, 6.2) is provided at the supply end and at the discharge end; the discharge-end clamping plate (6.2) is connected in a fixed manner to the shaft (6); the supply-end clamping plate (6.1) can be axially displaced on the shaft (6); the supply end of the shaft (6) is connected to a pressure plate (4) in a fixed manner to prevent an axial displacement; a pressure spring (7), which forces apart the pressure plate (4) and the supply-end clamping plate (6.1), is connected between the pressure plate (4) and the supply-end clamping plate (6.1); the discharge-end clamping plate (6.2) engages with the discharge end of the jacket (2).