Device for sintering shaped body

Abstract

The invention relates to a device (1) for sintering a porous shaped body (2) in an airtight chamber (3), the shaped body (2) being loosely suspended on a chain (7) so that it can be fed vertically to a heating District (5). In the region of the upper kettle (10), the direction of traction of the chain (7) is reversed by deflection wheels (11). The tension is transmitted via a traction rope (13) which can be wound on a reel (14) driven by a drive (16) arranged outside the chamber (3). A drive shaft (15) for the reel (14) ensures that the pipe (18) is easily isolated from the chamber (3), since the lifting movement requires only rotation without simultaneous axial movement and the pipe (18 ) is arranged at a spatial distance from the heating zone (5). The chain ( 7 ) is made of carbon fiber reinforced mineral carbon material and is therefore resistant to high temperatures, so that the molded body ( 2 ) cannot be contaminated by the release of material components of the chain ( 7 ).

Description

technical field [0001] The invention relates to a sintering device for sintering molded bodies, especially silica fume, in an airtight chamber. The device for vertically feeding the molded body into the heating zone is equipped with a lifting mechanism extending into the airtight chamber through a pipe. Such lifting Heavy machinery can be moved by drives located outdoors. Background technique [0002] In the manufacture of preforms for optical fiber or semiconductor engineering, semi-finished products are often used, the silica moldings being in the form of so-called gray bodies. For sintering, the shaped body is heated to its softening temperature and thus begins to transform. In the case of applications mainly in communications and semiconductor engineering, due to the high quality requirements, sintering is carried out in airtight chambers in order to reliably avoid any contamination. [0003] As a rule, an axially displaceable mast is used as a ...

AI Technical Summary

Problems solved by technology

[0008] The above problems occur more often in suspended structures, where the pipes are located above the molded body, and under the action of gravity, the sealing oil can easily seep into the chamber, even if the lifting machinery is erected, such problems cannot be avoided because of the The axial movement of the heavy rod relative to the pipe is impermissible in quantities where sealing oil seeps into the chamber even through the slightest damage to the sealing and this sealing oil will then be detectable in the molded body

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