Expansion frame

An expansion frame is a hydraulic expansion , which in mining the longwall was used. Extension frames were also used in combination, consisting of up to three extension frames, as extension frames . At the Victor Ickern colliery, extension frames were also used in steep storage to test the operational capability of this extension type.

Structure and use

The extension frame consists of a sleeper, a cap and two or three hydraulic rams . The hydraulic rams are connected to the threshold in the horizontal position and to the cap in the hanging area. With some types, the stamps in the lying area were connected with steel strip instead of a lying sleeper. In order to ensure that the extension frame stands securely, each extension frame is supported with a bracket. So that the longwall mining can be operated mechanically, hydraulic rams are used for the extension frame, each of which is controlled via a common central valve box. In the valve box there is a release valve, a filling valve and a pressure relief valve. The pressure relief valve works automatically and is set to a maximum permissible load. This determines the maximum load capacity of the extension frame with this valve. The individual expansion frames are supplied with hydraulic fluid via one or more common pumps . The high pressure liquid is supplied via high pressure pipelines . The hydraulic fluid is returned to the pump via a return line so that the hydraulic fluid does not run into the face when the extension frame is pulled forward . This creates a circulation of the liquid. With this type of extension, the filling and release valves usually have to be operated manually. But there are also expansion frames that are operated mechanically.

Individual evidence

^ ^A ^b ^c ^d ^e Carl Hellmut Fritzsche : Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962, pp. 586-587, ISBN 978-3-642-64967-7 .
^ ^A ^b Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
^ ^A ^b ^c ^d ^e Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 8th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1958, pp. 511-513, ISBN 978-3-642-52781-4 . Digitized , PDF, for a fee.

[Quelle_1-1] A ^b ^c ^d ^e Carl Hellmut Fritzsche : Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962, pp. 586-587, ISBN 978-3-642-64967-7 .

[Quelle_2-2] A ^b Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .

[Quelle_3-3] A ^b ^c ^d ^e Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 8th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1958, pp. 511-513, ISBN 978-3-642-52781-4 . Digitized , PDF, for a fee.