Find the most up-to-date version of BS at Engineering BS Rules For The Design Of Cranes – Part 2: Specification For Classification, Stress Calculations And Design Of Mechanisms. Bs Crane Design – Download as PDF File .pdf), Text File .txt) or read online. Civil Engineering.
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In calculating the torque applied to a mechanism or component during an accelerating or decelerating motion, it may be necessary to take into account the torques required to accelerate or decelerate the moving parts of the mechanism and drive unit themselves.
Part 2 ; Foreword The preparation of a British Standard dealing with design stress levels in the mechanisms of cranes was begun in response to demand from the user industries and particularly the public sector. Mention is made of practical design details only to the extent that they are inseparably associated with the basis for the permissible stresses.
Bolts other than friction grip bolts shall comply with the requirements of BSbut this does not preclude the use of specialized fasteners where appropriate, in accordance with the manufacturer’s recommendations. Loadings to be considered in the design of 4. The Amber document status indicator indicates that some caution is needed when using this document – it is either: Design of steel structures Fatigue.
When selecting a proprietary gear unit, the class of utilization and state of loading shall be used in establishing the service factor to be applied to the design rating of the gear unit. Attention is drawn 257-32 the existence in the UK and elsewhere of regulations concerning factors of safety for crane ropes which may override the requirements of this standard.
Tyres for crane wheels shall, where appropriate, comply with the requirements of BS 25573-2 minimum breaking load of a rope intended for a particular duty shall be determined from: Please download Chrome or Firefox or view our browser tips. Standard Search Industry Search. It takes account of the greater possibility in high speed mechanisms, and those in intensively used cranes handling loads near their maximum capacity, that combined stresses greater than those derived from calculation will occur.
Hooks and the capacity of gears are particular instances in which it should be possible to enlarge the treatment when ISO progress permits. Values of H for rope reeving components 8 6.
Whereas in 25573-2 case of crane structures there was considerable affinity with the fields of steel girder bridges and the use of structural steel in building which, to some extent, determined the analytical treatment, crane mechanisms involve specialized empirical design and problems can arise in the selection of proprietary components for which there is little precedent in other British Standards. Where a component is subjected to a combination of co-existent stresses, F c is the combined stress which shall be calculated as follows: The faster, easier way to work with standards.
For ductile materials the value of q may be obtained from published reference works or from experimental data. Classification of mechanisms 2 4.
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Classification of mechanisms 4. Attention is drawn to the need for thorough consultation between rope manufacturer and crane manufacturer. Mechanism duty factor, G 5 5. Capacities are rounded off in bw with R10 series. Z p where F 0 is the minimum required breaking load in kN ; S’ is the maximum rope tension in kN as defined in 8.
Whilst British Standards have existed, for many years, concerned with specific mechanical items that are used in cranes, such as steel wire ropes, hooks and antifriction bearings, the process of design of crane mechanisms has received only limited attention in the British Standards for particular types of crane.
For loading conditions 1 and 2 specified in 5.
Weapons Domestic and commercial equipment. Peterson, published by John Wiley and Sons The selection procedure given in 8, 5. This document Newer versions Older versions. In some cases, for example, the torque required to accelerate or retard a motor armature or rotor complete with coupling, brake drum and pinion assembly may be proportionately high in relation to the torques required to perform the 2573–2 function.
Reproduction and Redistribution Restricted: Derating of hooks Table showing selected sizes of point hooks, as listed in table 1 of BS Derating of hooks table 1 of BS Once a PDF file has been bound to a computer, it can be opened only from that computer.