Pause in production (shaft production)

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As a delivery pause , also fall break or operating break is called in the well production , the time for loading / or unloading and the goods support is needed. In order that a high conveying capacity can be achieved with a shaft hoisting system, the pauses in conveyance must be as short as possible.

General

The conveyed amount that can be conveyed with a shaft conveyor system in a certain time depends on the conveying speed at which a certain payload can be conveyed and the time required to load the payload onto the conveyed goods carrier or to unload it again. During the time required for loading, unloading or exchanging the conveying vessels , the conveying pause, the respective conveying machine or the reel cannot convey. The length of the pause in production depends in turn on the payload being conveyed. When conveying containers, the pause in conveyance depends on the speed (tons of payload per second) at which the conveying container can be loaded or unloaded. In the case of rack conveyance , the length of the pause in conveyance depends on how fast a full trolley can be pushed onto the conveyor cage and an empty trolley can be pushed down. In addition, there is the time required to move the conveyor cage. Depending on the conveyor system, the break in conveyance can be between a third and a half of the travel time of the goods carrier.

The times required

Depending on the conveyor system, the operating pause is of different length. In the previously used reel conveyors, the pause required for the lifting of the conveying drums , bulges or conveying buckets already filled at the filling location was around one to three minutes. If the empty conveying vessels hanging on the hoisting rope had to be filled first, the pause was three to six minutes. When this form of shaft conveyance was switched to frame conveyance, the fall pause could be reduced to 30 seconds per support floor. With modern shaft hoists a time of 13 seconds is required for loading a supporting floor and giving a signal . In the case of conveyor racks with multiple shelves, two seconds are added to move from one shelf to the next. In a conveyor basket with four trays and only one feeder per strand , the conveying interval is, depending on whether only one or two trolleys are pushed per tray, between 45 and 60 seconds. When conveying containers, the pause in conveyance lasts, under optimal conditions, one second per ton of payload. However, depending on the conveyor system, this value can be between 1.5 and 2 seconds per ton of payload.

Individual evidence

  1. ↑ a b c d Fritz Schmidt: The basics of the conveyor machine system. Second increased and improved edition, Springer-Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1923, pp. 27-29.
  2. ↑ a b c d e Kammerer-Charlottenburg: The technology of load handling then and now. A study of the development of lifting machines and their influence on economic life and cultural history, printing and publishing by R. Oldenbourg, Munich and Berlin 1907, pp. 58, 59.
  3. ^ A b c d e Carl Hellmut Fritzsche: Textbook of mining science with special consideration of hard coal mining. First volume, ninth completely revised edition, Springer Verlag, Berlin / Heidelberg 1955, pp. 441–443.
  4. ↑ a b c Julius Ritter von Hauer: The conveyors of the mines. Published by Arthur Felix, Leipzig 1871, p. 139.
  5. ↑ a b c P. Walter: Determination of the payload in the shaft conveyance, in particular the vessel conveyance. In: Glückauf, Berg- und Hüttenmännische magazine. Association for mining interests in the Oberbergamtsiertel Dortmund (Ed.), No. 16, 67th year, April 18, 1931, pp. 513-523.