Experimental studies of load transformation of the support contour of a load-lifting crane

One of the features of operation of self-propelled boom cranes is balancing of the hoisting crane on outriggers, i.e. cyclic loading and unloading of the crane supports depending on the azimuthal position of the rotating part of the crane with the load. However, this process is not fully covered in the technical literature. Objective of the study: to study the process of transformation (change) of the loading of the support contour of a self-propelled boom crane in a dynamic loading mode; as the main parameter characterizing the process of transformation of the support base of a self-propelled boom crane, the dependencies of the support reactions in time are selected. Methods: analytical calculation of the dependencies of the support reactions of a self-propelled boom crane in time from the parameters of the stress-strain state of the hanging hydraulic cylinder, which are determined using the strain gauge method in experimental studies of dynamic loading of a self-propelled boom crane with a change in the loading of the support contour. The obtained data were processed according to probability theory and mathematical statistics. The experimental studies were conducted on a real overhead crane – a boom truck crane of the KS-45717 type. Results: the analysis of experimental studies of the dynamic loading of the overhead crane is presented in terms of changing the loading of the support contour. As a result of the analysis, it was concluded that when the rotating part of the crane with a load rotated, the loading of the support contour of the overhead crane was transformed (balancing) – sequential cyclic loading and unloading of the crane supports. In the conducted experimental studies, the spatial position of the center of mass of the «overhead crane – load» system was determined. As part of the study of the hanging hydraulic cylinder, the parameters of the distribution of the stress-strain state of the cylinder (housing) of the hydraulic cylinder as a function of time were determined.