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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The class of utilization shall be selected according to the value of service life given in table 1 that is nearest to, but not less than, the assumed service life determined by the procedure outlined in the previous paragraph. U s is the ultimate tensile strength of the material. 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.
Fatigue reference stress factor, C f r 18 8. 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. Standard Search Industry Search. Hooks and the capacity of gears are particular instances in which it should be possible to enlarge the treatment when ISO progress permits.
Service life of a mechanism or component The service life of a mechanism or component is defined as ‘the total number of be during which the mechanism or component is in motion’.
This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. It applies to ropes complying with the requirements of ISO ; it does not exclude, however, ropes that are not specified in ISO Specification for classification, stress calculations and design of mechanisms incorporating amendments No. Want access to British Standards? When the driving unit of a travel or traverse mechanism has been selected to give high accelerations, the torque transmitted by the mechanism may be limited by skidding of the wheels on the rails.
The material for shafts shall be selected from steels having suitable physical properties for the duty required. Alternatively the factor Cf r can be determined from the following formulae, in 2573-22 N is the total number of cycles.
References 2 D, Gearing 20 3. Although de-rating is not mandatory for reasons of permissible stress resulting from the working load, it may be advisable from the point of view of obtaining increased endurance under arduous conditions of use. Rules for the bbs of cranes. Further factors relating to specific mechanisms of a crane are discussed in B. In practical terms this should ensure, for example, that the couplings, shafts, gears, bearings, etc.
Part 1 to regulate and rationalize design stress levels in crane structures of all types, and its recent revision to align more closely with international policy in the International Organization for Standardization ISOit became increasingly urgent to produce a corresponding standard for crane mechanisms, and developments in ISO Technical Committee 96, Cranes, Lifting Appliances and Related Excavator Equipment, indicated the sort of approach that might be adopted.
In cases where there is adequate service experience of similar or comparable components under known duty conditions, the checks shall be confined to comparisons or extrapolations on a suitable basis.
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 be 273-2. The factors that need to be considered when determining the required diameter for a particular be wheel are: Jewellery Road vehicles engineering Railway engineering Shipbuilding and marine structures Aircraft and space vehicle engineering Materials handling equipment Packaging and distribution of goods Textile and leather technology Clothing industry Agriculture Food technology Chemical technology Mining and minerals Petroleum and related technologies Metallurgy Wood technology Glass and ceramics industries Rubber and plastic industries Paper technology Paint and colour industries Construction 25732- and building Civil engineering Military affairs.
The basis for derating suggested for these cases is the overall crane classification see clause 3 and table 1 of BS For example, failure in a hoisting mechanism component is usually a more dangerous occurrence than failure of a horizontal motion mechanism.
Size factor, C 2 19 8. 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.
Specification for classification, stress calculations and design of mechanisms. sb
December Replaced By: Mechanism components shall be checked for strength under case 1, 2, 3 and 4 loading conditions specified in 5. Accept and continue Learn more about the cookies we use and how to change your settings. Customers who bought this product also bought BS Selection of components 6 Arrangements ns axial location shall be in accordance with correct practice so that unforeseen additional bearing loads are not introduced.
Load actions incorporating corrigenda March and November Mention is made of practical design details only to the extent that they are inseparably associated with the basis for the permissible stresses. As a typical example for guidance, appendix E bw a proposed basis for the derating of hooks in accordance with BS which has regard to their vs factor of safety for class 1 crane duty when used on heavy industrial applications. Specification for classification, stress calculations and design of mechanisms Status: Appendix D lists the hours per day which shall be used for design purposes b each class of utilization.
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The determination of the maximum tensile force, S, in the various ropes which do not exclusively serve in the vertical hoisting of the load shall be based on the loads determined from 2573-22 loading conditions specified in 5.
In calculating the torque applied to a mechanism 25773-2 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. Whereas in the case of crane structures there was considerable affinity bd 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.
Find Similar Items This product falls into the following categories. Rail wheels shall be checked under the loading conditions specified in 5.
Capacities are rounded off in line with RIO series. Loadings to be considered in the design of 4.
When the class of utilization and the state of loading has been determined, the group classification of a mechanism shall be determined from table 3.