Pulley platform

A sheave platform is a mechanical construction that is used to hold and store the sheaves of a shaft hoisting system. Rope sheave platforms must be designed in such a way that maintenance of the rope sheave bearings is possible without endangering maintenance personnel.

construction

Headframe from above with a view of the sheave platform. The stairs to the pulley platform attached to the side of the guide frame can be clearly seen.

Each pulley platform consists of a square frame made of double T-beams or U-iron. This frame is firmly connected to the headframe and is supported by the frame and the frame struts. There are also constructions in which the sheave platforms are connected to the headframe via joints. These joints consist of riveted sheet metal plates. The sheave carriers lie firmly on the sheave platform. Regardless of previous calculations, the girders must rest at least 0.4 meters on the frame. The girders displaced in this way must be screwed with anchor bolts that are protected against corrosion. Depending on the conveyor system, either three or four pulley carriers are used. The pulley bearings are attached to these carriers. The bearing blocks must also be screwed in with suitable anchor bolts. If four supports are used, a bearing block is mounted on each support. If the sheave platform has only three sheave carriers, the sheave bearings of both conveyor strands are mounted on the inner carrier . In order to be able to monitor and maintain the bearings, walkways or platforms must be installed in the area of the pulley supports. A structure containing a trolley is attached above the pulley platform . This trolley is moved on two rails and is used to replace the sheaves if necessary. Below the sheave platform, the bumper beam is attached to protect the sheaves at a prescribed distance .

Location and accessibility

The sheave platform is located at the upper end of the headframe above the guide frame. If the two conveyor fragments are located next to each other from the machine on floor conveyors , only one pulley platform is required on which the two pulleys are then mounted next to each other on the pulley supports. If the hoisting machine is arranged in such a way that the two conveyor gutters are one behind the other, then two pulley platforms must be mounted one above the other. The pulley platform must have a certain minimum distance from the lawn bench . This depends on the height of the conveyor cage and a prescribed safety distance between the upper cage and the center of the pulley. The distance between the lawn bench and the center of the pulley can be up to 40 meters, depending on the conveyor system. The pulley platform can be reached either by driving or by stairs. If journeys are used, these are attached to the struts of the headframe. When using stairs, it is possible to mount them either on the struts or on the guide frame. When assembling on the guide frame, the stairs are attached as spirals around the frame. These access aids are provided with a railing for safety. Stairs are safer to use than journeys and are preferred to journeys if possible.

Individual evidence

↑ ^a ^b Rainer Slotta: The role of iron in the mining architecture of the second half of the 19th century with special consideration of the headframes and headframes . In: iron architecture. ICOMOS, German National Committee (ed.), 5. – 9. October 1981, pp. 14-16.
↑ ^a ^b ^c ^d Technical requirements for shaft and inclined conveyor systems (TAS) . Verlag Hermann Bellmann, Dortmund 2005.
↑ ^a ^b ^c ^d ^e ^f ^g Hans Bansen (ed.): The mining machines . Fourth volume, The shaft production. Published by Julius Springer, Berlin 1913, 301–304.
↑ Walter Buschmann : Collieries and coking plants in the Rhenish coal mining industry, Aachen district and western Ruhr area. Gebr. Mann Verlag, Berlin 1998, ISBN 3-7861-1963-5 , pp. 92-95.
↑ ^a ^b Schmitz: New headframe constructions . In: Steel construction. Supplement to the journal "Die Bautechnik", a specialist journal for civil engineering, issue 19, 3rd year, Berlin September 19, 1930, pp. 221–224.
^ Fritz Schmidt: The basics of the conveyor machine system . First part, second increased and improved edition, Springer-Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1923, p. 10.

Web links

Photo of a pulley stage on fotocommunity (accessed January 22, 2016)

[Quelle_1-1] Rainer Slotta: The role of iron in the mining architecture of the second half of the 19th century with special consideration of the headframes and headframes . In: iron architecture. ICOMOS, German National Committee (ed.), 5. – 9. October 1981, pp. 14-16.

[Quelle_2-2] Technical requirements for shaft and inclined conveyor systems (TAS) . Verlag Hermann Bellmann, Dortmund 2005.

[Quelle_3-3] ↑ ^a ^b ^c ^d ^e ^f ^g Hans Bansen (ed.): The mining machines . Fourth volume, The shaft production. Published by Julius Springer, Berlin 1913, 301–304.

[Quelle_4-4] Walter Buschmann : Collieries and coking plants in the Rhenish coal mining industry, Aachen district and western Ruhr area. Gebr. Mann Verlag, Berlin 1998, ISBN 3-7861-1963-5 , pp. 92-95.

[Quelle_5-5] Schmitz: New headframe constructions . In: Steel construction. Supplement to the journal "Die Bautechnik", a specialist journal for civil engineering, issue 19, 3rd year, Berlin September 19, 1930, pp. 221–224.

[Quelle_6-6] Fritz Schmidt: The basics of the conveyor machine system . First part, second increased and improved edition, Springer-Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1923, p. 10.