KINETOSTATIC ANALYSIS OF OUTRIGGER SHOE EXTENDING MECHANISM

The stability of self-propelled jib cranes when operating on weak soils is provided, as a rule, by outriggers, which reactions are unevenly distributed, which leads to uneven subsidence into the ground. To ensure a uniform distribution of reactions under each support, it is proposed to make the support shoe as composite of parts with the possibility of removing these parts to increase the area of the support surface. To solve this problem, the paper proposes a mechanism for extending the support element, since the shoe is proposed to be collapsible. To confirm the operability of the proposed mechanism, a kinetostatic analysis of the outrigger shoe extending mechanism was performed. The theoretical studies of the kinematic state of the shoe extending mechanism made it possible to determine the point of rational attachment of the mechanism crank in relation to the main element of the outrigger of a self-propelled jib crane. Dynamic analysis of the mechanism makes it possible to determine the forces in the joints and, accordingly, to carry out a strength calculation of the structural elements of the mechanism. Under the condition that the mass center of each link is located in the center of the link, the maximum bending moment will fall on this point. Dependencies are found out that make it possible to apply the automatic mode of measuring the outrigger support area, as well as to make a decision on the development of a rational design of the outrigger mechanism and to assess the degree of their loading.