6_Design_approach_for_transportation_equipment

transported volumes per second conveyor belts fluid

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Unformatted text preview: peed etc.); • transported volumes per second (conveyor belts); • fluid pressure in the equipment (pneumatic conveyors, hydraulic equipment); • attainable number of handling cycles per hour; • quality of the load pick-up devices (spreader, grab, vacuum equipment, special attachments); • load control (load suspended on wire ropes, guided load by means of mechanical devices, etc.); • delays between the various sub-cycles of the equipment handling cycle; • type of control for the equipment; • dynamic behaviour of the equipment (influences from equipment dead load, structural stiffness, drive control, etc.); • special provisions as an interface to the next transportation process. - Type of control Is the equipment manually driven or automated; what is the influence of the operator; is the equipment controlled in an overall automated system; what is the required control interfacing etc. Safety demands What provisions must be made to ensure a safe operation in a variety of operational situations. When working in an automated mode which requirements must be met to avoid accidents Environmental requirements The society tries to avoid the disadvantages of industrialisation and so equipment has to meet certain generally recognised requirements, (sometimes stipulated by law) with regard to noise levels, water and air pollution, the use of scarce material, the consumption of energy and the possibilities for the application of recyclable materials. The interfacing in the overall system These requirements determine how the equipment is interconnected in the overall system, which commands control the exchange of loads, which controls avoid damages to equipment etc. - - - 2 - - The availability of the equipment Requirements for maximum periods of ont-of-service must be specified. Required overhauls, periodic maintenance, functional checks etc. must be examined and specified. Reliability Especially in automated transportation systems the equipment reliability is of utmost importance. The MTBF (Mean Time Between Failure) and MTTR (Mean time To Repair) are the most important characteristics. The maintainability’s is a related functionality which determines the possibilities for maintenance during operations, the ease of access to vital equipment components and the possibilities to exchange components in running condition. Ad b Structural demands In order to enable the fulfilment of the functional requirements the equipment must be shaped, must have all kind of properties; some of them are given below: - The technical concept This describes the major technical systems, components and required characteristics as well as the structural concept, major dimensions etc. - Shape of design concept The customer may have specific demands for the main structural concept of the equipment (box girder, lattice girder, machinery trolley, rope driven trolley, continuous unloader, stacking and retrieval equipment supported from the top etc.). - The absorbtion of and resistance to loads This asks for the specification of required stiffness, maximum allowable stresses, the resistance to fatigue loads, required stability under various operating conditions, the abs...
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