Intermediate dishes

from Wikipedia, the free encyclopedia
Jacked up intermediate crockery in front of shaft 7 of the Erin colliery in Castrop-Rauxel

The connecting element between the hoisting cage and the hoisting rope of a conveyor system is called the intermediate harness . It is used to compensate for changes in length of the hauling rope. The intermediate harness includes all connecting parts that are located between the hoisting ropes and the connecting plates or suspension plates that are rigidly attached to the conveyor or counterweight.

Basics

Conveyor ropes are elongated due to the load during operation. This operational change in length has a disruptive effect on the operation of the shaft hoisting system. These rope elongations must be regularly compensated. In the case of traction sheave conveyor systems in particular, it is often necessary to shorten the rope. If the hoisting rope is attached directly to the hoisting cage or conveyor frame, there would be no possibility of a new attachment if the attachment point is damaged. In addition, a direct connection would eliminate the possibility of simply compensating for operational changes in rope length. An intermediate harness makes it possible to easily compensate for changes in rope length. In addition, the intermediate harness prevents any rope vibrations from running off the large mass of the bucket. In this way, damage to the fastening point of the hoisting rope, which can be caused by rope vibrations, is largely avoided.

Components of the intermediate harness

The intermediate harness is made of the components Kausch cover (common thimble or clamping thimble ), hiding device universal joint and King rod. The respective components of the intermediate harness must be made of high-quality steel or welded iron. Depending on the type of crockery, they are manufactured for loads of 25 to 430 kilonewtons . The manufactured intermediate harnesses are provided with a test sticker by the manufacturer. In addition to the intermediate harnesses for single-rope hoists, there are also those for multi-rope hoists. In the case of multiple rope hoists, the loads on each individual rope must be checked carefully. The so-called statimeter measurement is used for this .

The jammed haul rope , the cut-off bearing end at the top, the loose end at the bottom

Thimble cover

The thimble binding is the connection between the conveyor and the lower or upper rope. The task of the thimble is to ensure a safe and reliable attachment for the hauling rope. In addition, the hoisting rope is largely protected by the thimble. Another possibility of thimbles is the use of so-called thimbles. With this type of thimble, the hoisting rope pulls itself tight when the thimble heart is pulled into the thimble housing.

Hiding device

Hiding device ...
... for adjusting the height of the
basket with centimeter precision

The hiding device is part of the intermediate harness and is used to compensate for rope elongations. Since the hoisting ropes lengthen continuously over their entire lay-in time, the hiding device is required. This is particularly necessary with two-legged conveyor systems. In the case of multi-rope hoisting systems, the fact that the individual hoisting ropes are of different lengths makes things more difficult. So that there are no different loads on the individual conveyor ropes, these differences in rope lengths are compensated for by the hiding device. Due to the fact that the hauling rope does not have to be pulled through the rope thimble every time the rope is lengthened, maintenance costs can be reduced by using a hiding device. The hiding device consists of a slotted middle flap and two outer flaps, which are also slotted. The hiding device serves to compensate for the conveyor rope lengths, this is done by repositioning fitting pieces from the magazine of the hiding device into the longitudinal slot of the tabs. With the hiding device, hiding lengths of up to 1000 millimeters, in steps of 100 millimeters each, are possible.

Universal joint

The basket is suspended movably over two axes

The universal joint is a joint with axes arranged at right angles to one another. Universal joints are installed directly above the king bar. In the case of conveyor systems that are operated at speeds above 4 , it is imperative to install at least one universal joint. For safety reasons, the universal joints used may only allow a 30 degree deflection from the respective central position.

King pole

The king bar is the main part of the connection between the hoisting rope and the hoisting frame. It forms the point of application of the intermediate harness on the bucket or cage . The conveyor cage is suspended exactly in the center of the king bar. In the king bar there are two holes for the support bolts. There are rigid king bars that can be moved lengthways. Since the king's bar is a safety-relevant component, high demands are placed on it. The guidelines demand that the shafts of king rods have at least fifteen times the security against static loads. Tenfold security is sufficient for all other parts of the king's pole. The rod shaft of the king rod must be completely free of scores, because grooves in the rod shaft of the king rod represent a material weakening. For safety reasons, rods damaged in this way must not be installed.

literature

  • H. Hoffmann, C. Hoffmann: Textbook of mining machines (power and work machines). 3rd edition, Springer Verlag OHG, Berlin 1941

Individual evidence

  1. a b c d e f Hans Bansen (Hrsg.): The mining machines . Fourth volume, The shaft production. Published by Julius Springer, Berlin 1913, pp. 159–177.
  2. ^ A b c Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
  3. a b c d e Technical requirements for shaft and inclined conveyor systems (TAS) . Verlag Hermann Bellmann, Dortmund 2005.
  4. a b Richard Meebold: The wire ropes in practice. Springer-Verlag Berlin Heidelberg GmbH, Berlin 1938, pp. 39-47.
  5. ^ A b c d e Carl Hellmut Fritzsche: Textbook of mining science. First volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1961, pp. 503–507.
  6. a b c d e f Siemag Tecberg (Hrsg.): Technical information rope harnesses .
  7. Reinald Skiba : Taschenbuch Betriebliche Sicherheitstechnik. 3rd edition, Erich Schmidt Verlag, Regensburg and Münster 1991, pages 361–363, ISBN 3-503-02943-5 .
  8. a b Patent DE3936905C1 August 9, 1990 from MAN Gutehoffnungshütte AG: Hiding device in the intermediate harness of mining shaft conveyor systems. Online (last accessed August 12, 2013).