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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This appendix shows the range of crane mechanism classifications normally associated with particular types of crane; it should not be considered as a substitute for the process of determining classification specified in 4.
This appendix outlines a method of determining the fatigue reference stress for a component detail. Any pre-loading arrangements shall also be considered. Because cranes lift and transport heavy loads, there is a major safety aspect in their design which has, to some extent, to be related to the level of design stresses permitted.
Specification for classification, stress calculations and design of mechanisms incorporating amendments No. Amendment dated September Design of 2573- structures Fatigue. It is an important responsibility of the designer and manufacturer ns ensure that torque values are correctly and appropriately quantified so that mechanism will perform as required in the service environment for the intended life.
Take the smart route to manage medical device compliance. 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. In the case of proprietary slewing rings, it is particularly important that the manufacturer is consulted and given full details of the loads and duty involved.
It was essential to recognize in the standard that bss of crane mechanisms under known service conditions is the most valuable and reliable basis for design, and that absolute stress computations are the exception rather than the rule.
Full text of “Safety British Standards”
Specifies classification of mechanisms for all types of cranes based on severity of intended use, loads and load combinations, calculation of stresses, stresses in components and hs selection and verification of proprietary items.
Why is it a Secure PDF? Account shall be taken of any loading conditions that are known to apply but which are not covered under the other three cases of loading. System Requirements and FileOpen Plug-in download.
Where a static rope is not clearly associated with a particular mechanism, the minimum coefficient of utilization, Z pshall be taken as that corresponding to the hoist mechanism of 257-32 appliance. 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.
Appendix D lists the hours per day which shall be used for design purposes for each class of utilization. Nevertheless, 22573-2 has been the general experience of users, manufacturers and the safety authorities that, where design was found to contribute to an accident, it was nearly always caused by bad detail design or failure to appreciate the loadings involved rather than the selection of too high a permissible stress.
In either case, account should be taken of the starting characteristics of the drive unit or the retarding properties of the brake system, as appropriate.
This is the total number of hours for which the mechanism will be in motion. Classes of utilization of mechanisms Class of utilization Service life hours Remarks T1 Irregular use. This security feature prevents the reproduction and redistribution of downloaded documents.
Classification of mechanisms 2 4.
For a given ns, wheels of this type have a much longer useful life than wheels of lesser surface hardness, which makes their use worthwhile in the case of appliances bz intensive duty. Table T 2 gives the hours per day to be used for design purposes for each class of utilization when designing gearing in accordance with BS Load actions incorporating corrigenda March and November Suitable steels are specified in BS Whereas in the case of crane structures there was considerable affinity with the fields of steel girder sb 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.
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 bd and particularly the public sector. Click here to find out how to access this document.
Users of British Standards are responsible for their correct application. In assessing the individual loadings arising under case 1 and case 2 loading conditions, the hook load impact factor is not applied.
Specification for classification, stress calculations and design of mechanisms v 1. Einteilung, Spannungsberechnungen und Konstruktion von Ausruestungsteilen. The effect of a notch on the fatigue strength of a part varies considerably with material and notch geometry and is normally less than would be predicted by bw use of the stress concentration factor. U s is the ultimate tensile strength 253-2 the material. Whilst, to some users, the unfamiliarity of this concept may initially raise doubts, it is considered to give the best bz scope for precise definition of the purchaser’s requirements on the one hand and for rational mechanism design and economic production on the other.
R 2 Loads due to the dead weight of those parts of the crane acting on the mechanism or component under consideration. Peterson, published by John Wiley and Sons These loads include those due to the inertia of the mechanism itself, its prime mover, brakes, the associated crane parts, the hook load, the concurrent operation of other motions, etc.
References The titles of the ns publications referred to in this standard are listed on the inside back cover. It also provides a framework of reference between the purchaser and the manufacturer. Treatment of multiple stress concen- trations in close proximity is outside of the scope of this appendix and where this situation arises reference should be made to established reference works.