Multivariate calculation of the lifting mechanism of a bridge-type crane on a computer

The mechanism for lifting the load of bridge-type cranes, as a rule, is placed on a cargo trolley moving along the crane bridge. The weight of the cargo trolley and the weight of the load create a bending moment on the bridge. The bending moment is the main force factor in the calculation of the metal structure of the crane, that is, its value largely determines the metal capacity of the crane. Therefore, minimizing the weight and size parameters of the lifting mechanism is one of the most important tasks in the design of bridge cranes. In the classical methods of calculating the mechanism for lifting the load of a bridge type crane, the elements of the mechanism are selected on the basis of their sequential calculation, taking into account the corresponding safety factors. This approach does not imply variation in the parameters of the lifting mechanism and does not allow achieving its minimum weight and size indicators. Minimizing the weight and size parameters of the lifting mechanism of a bridge-type crane can be provided by comparing various variants of its layout schemes. This can be achieved on the basis of multivariate calculation. Obviously, the multivariate calculation of the lifting mechanism of a bridge-type crane increases the amount of calculations and is very time-consuming to implement manually. This determines the relevance of developing a methodology for multivariate calculation of the mechanism for lifting the load of a bridge type crane and a computer program that implements it. The paper presents a methodology for multivariate calculation of the load lifting mechanism, which allows varying the multiplicity of the cargo polispast, the displacement step according to the classification group of the operating mode of the drum diameter selection coefficient and the minimum rope utilization coefficient, as well as the computer program that implements this methodology.