Safety supports

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Fang supports , also called catching pawls which are movable steel bars that serve a conveyor basket or a bucket , wherein the conveyor cable according to any one exaggerate torn is to catch. Safety supports are installed in the headframe or in the case of blind shafts in the blind shaft head.

Necessity and function

In hoisting systems it can happen in case of failure of the electrical safety devices that the conveyor is not stopped and despite overdo fuse below the bounce carrier drives. The impact can be so strong that the hoisting rope is torn off and the conveying means becomes ropeless. So that the conveying equipment does not fall into the shaft , it must be prevented from falling using suitable mechanical safeguards. The safety supports are used for this. These moving components are constructed in such a way that they avoid the upward conveyance and then fall back into their original position. If the basket then falls down, it is held by the safety supports.

Design and installation

The safety supports are calculated in accordance with DIN 4118 Headframes and Headframes for Mining; Load assumptions, calculation and design bases . In addition, the steel construction adaptation guideline, Section 4.8 , must be taken into account when dimensioning the safety supports . In order for the safety supports to function properly, they must have certain design features. In this way, it must be ensured that they fall back into their starting position after the conveyance has passed through and cannot evade when the conveyance is caught. In addition, they must be constructed in such a way that they cannot overturn. A total of four safety supports are required for each funding. Two safety supports must be attached in each case in the area of ​​the end faces of the conveyor. So that the safety supports can grasp the falling conveying means, they are installed in the winding tower in such a way that they can at least grasp the uppermost supporting floor. The height of fall that the conveyor can cover up to the safety supports must not exceed 0.5 meters. Wherever the height of the headframe allows, the safety supports are installed so that in the event of a fault they reach under the lowest supporting floor. No safety supports are required for conveyor systems with conveyor buckets .

Individual evidence

  1. ↑ a b c d Technical requirements for shaft and inclined conveyor systems (TAS). Verlag Hermann Bellmann, Dortmund 2005
  2. ^ A b c d e Carl Hellmut Fritzsche: Textbook of mining science. First volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1961
  3. ↑ Hans Bansen (ed.): The mining machines . Fourth volume, The shaft production. Published by Julius Springer, Berlin 1913, pp. 289–294.
  4. ↑ Horst Roschlau, Wolfram Heintze: Bergmaschinentechnik. VEB German publishing house for basic industry, Leipzig 1977, pp. 266-267.