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Tight electrode connection

IP.com Disclosure Number: IPCOM000022280D
Publication Date: 2004-Mar-04
Document File: 1 page(s) / 21K

Publishing Venue

The IP.com Prior Art Database

Abstract

In the practical running of a steelworks, one attempts to screw graphite electrodes together as firmly as possible. The forces, turning moments and screwing effort that can be applied manually are limited due to the ceramic material properties of the electrodes. These forces may be increased considerably using machinery, but such mechanical screwing devices are only utilized in a few steelworks. Actual steelworks operations indicate that elements of the electrode columns still come loose repeatedly. We therefore provide a threaded connection for carbon and/or graphite electrode columns which overcomes the above-mentioned disadvantage and which provides for the manufacture of parts from ceramics, preferably parts from synthetically produced carbon and graphite for a threaded connection that will prevent loosening, or at least mitigate the consequences of loosening. With the foregoing and other objects in view there is provided, in accordance with our invention, an assembly with a threaded connection, comprising: an outer part made from ceramic and having an internal thread; an inner part made from ceramic and having an external thread; the internal thread and the external thread having thread windings with a substantially uniform pitch, a root and a crest, and individual thread windings with a substantially v-shaped profile, at least one of the internal and external threads being formed with a wedge ramp at the root and, when the inner and outer parts are screwed into one another, the crests of one of the parts abut with the wedge ramps at the root of the other one of the parts; and the internal and external threads being cylindrical threads or conical threads. In other words, the threaded connection parts are made from ceramic, preferably from synthetically produced carbon or graphite, and the threads are cylindrical or conical. When the parts of a threaded connection are engaged, the thread crests of the one part abut against the wedge ramps on the thread winding roots of the other part. This means that the load is no longer borne by the flanks of the individual thread windings of the threaded connection. Consequently, thread windings having for example a v-shaped profile and corresponding thread winding flanks can be dispensed with in the threaded connection part that has wedge ramps at its thread winding roots.

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In the practical running of a steelworks, one attempts to screw graphite electrodes together as firmly as possible. The forces, turning moments and screwing effort that can be applied manually are limited due to the ceramic material properties of the electrodes. These forces may be increased considerably using machinery, but such mechanical screwing devices are only utilized in a few steelworks. Actual steelworks operations indicate that elements of the electrode columns still come loose repeatedly.

We therefore provide a threaded connection for carbon and/or graphite electrode columns which overcomes the above-mentioned disadvantage and which provides for the manufacture of parts from ceramics, preferably parts from synthetically produced carbon and graphite for a threaded connection that will prevent loosening, or at least mitigate the consequences of loosening.

With the foregoing and other objects in view there is provided, in accordance with our invention, an assembly with a threaded connection, comprising:

an outer part made from ceramic and having an internal thread;

an inner part made from ceramic and having an external thread;

the internal thread and the external thread having thread windings with a substantially uniform pitch, a root and a crest, and individual thread windings with a substantially v-shaped profile, at least one of the internal and external threads being formed with a wedge ramp at the root and, when the inner and outer parts are screwed into one ano...