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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Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards. This security feature prevents the reproduction and redistribution of downloaded documents. In general, components shall be required not to fail under extreme loading conditions that are likely to occur occasionally during service. Classification, caiculs des contraintes et conception des mecanismes — Specifications Regeln fur den Kranbau Teil 2.
For the purpose of applying this Part of this British Standard, mechanisms shall be classified into groups according to their desired service life and the conditions of loading to which they are subjected. Design and selection shall have regard to the potentially serious consequences of failure.
Surface finish factor, C 3 19 8.
Full text of “Safety British Standards”
You may find similar items within these categories by selecting from the choices below:. In practical terms this should ensure, for example, that the couplings, shafts, gears, bearings, etc.
Where the bearing manufacturer’s selection procedure includes a method of determining an equivalent load for a spectrum of loading and this differs from the method described in clause 4, the bearing manufacturer’s method shall ba followed. Where the appliance hs which the mechanism is part has known duties, such as would be the case where it performed part of a continuous, repetitive process, the service life shall be calculated from the actual daily utilization time for the mechanism, the number of working days per year and the number of years of expected service.
This appendix outlines a method of determining the fatigue reference stress for a component detail.
This is the total number of hours for which the mechanism will be in motion. Derating of hooks table 1 of BS An approach, based on ISO work, was finally adopted which enables each mechanism of a crane to be classified in respect of the duty it performs, independently of the design classification of the whole crane.
States of loading of mechanisms 3 4. In cases where there is adequate service experience of similar or comparable components under known duty conditions, the checks may be confined to comparisons or extrapolations on a suitable basis.
Hours per day for gear design Class of utilization Hours per day for gear design T1 0. In this connection, consider- ation shall be given to the consequences of failure. Due regard shall also be taken of other factors, such as deflection or overheating, which be interfere with the correct functioning of the mechanism. For this purpose, the mechanism design has to be carried out with particular attention to integrity, taking into account the time required to effect repairs arising from accidental or other unforeseen circumstances outside normal service conditions.
For certain steelworks cranes, other heavy doty cranes and cranes which may be used in circumstances under which persons are subject 2573–2 particularly high risk such as in mine shaft sinking and when raising and lowering persons, it is desirable to derate the capacities of the hooks to values below those stated in the appropriate standard in order to ensure compatibility with the lifting appliance and accessories, to reduce wear or to provide an increased margin of safety.
When the driving unit of a travel or traverse mechanism has been selected to give high accelerations, the torque transmitted by ns mechanism may be limited by 25773-2 of the 2537-2 on the rails. Loadings to be considered in the design of 4.
Specification for classification, stress calculations and design of mechanisms. Swivelling hooks used on power driven appliances shall be mounted on rolling bearings. Verification of components 4 8. As a typical example for guidance, appendix E shows a proposed basis for the derating of hooks in accordance with BS which has regard to their design factor of safety for class 1 crane duty when used on heavy industrial applications. Suitable surface roughness values for stressed portions of shafts 25733-2 be selected having regard be size, stress levels, severity of stress raising features and the needs of bearings, seals, etc.
Any pre-loading arrangements shall also be considered. The committee found its scope limited in certain areas where the revision of some British Standards has been held back in order to take advantage of work which is being carried out in ISO. 2573-22 selection, fitting and lubrication of plain bearings shall be in accordance with 25733-2 bearing manufacturer’s procedures. These approaches are implicit in the loading conditions given in clause 5.
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