LOADS OF THE TELESCOPIC BOOM FROM LOCAL LOADS DURING TELESCOPING

Abstract

One of the main factors affecting the performance of telescopic booms is the loss of local stability of the shelves and section walls. The loss of local stability of the sections occurs due to the development of plastic deformations in some of the most loaded sections of the telescopic booms or as a result of the loss of stable equilibrium of the sections even at the stage of elastic deformation. In this case, the maximum stresses of the telescopic boom are formed in the sections of the location of the supporting elements, where the summation of deformations from external loads and forces acting from the side of the supporting elements (local loads) occurs. The aim of the work is to study the loading of telescopic boom from the action of local forces in the process of telescoping. Analysis of the loading of telescopic boom in the process of extending (retracting) the sections is carried out using the example of the boom equipment of a railway crane Sokol 80.01M. Numerical modeling is used to study the local loading of telescopic boom of a crane during telescoping. Three telescoping modes are selected: consecutive extension (retraction) of sections without load; synchronous extension (retraction) of sections without load; consecutive extension (retraction) of sections with a load. The results of the virtual experiment for each mode are the time dependences of the local forces generated at the locations of the sliding bearings, and the time dependences of the vertical loads on the pins of the telescoping hydraulic cylinders. A comparison was made of the greatest loadings of the boom and telescoping hydraulic cylinders formed with three options for extending (retracting) sections. Based on the obtained dependencies of local loads, the maximum stresses of the telescopic boom were calculated during each telescoping mode.