SUBSTANTIATION OF THE METHOD TO SELECT THE PARAMETERS OF SAFETY CATCH STRUCTURAL ELEMENTS

Study objective. The problem of elevator accidents is relevant, which requires improvement or creation of fundamentally new safety catch designs with the corresponding substantiation of parameters selection. The paper proposes a fundamentally new constructive solution to ensure the safety of elevators (catcher) when the lifting rope breaks. The proposed device, that is an articulating system, is located on the side walls of the elevator cabin and is centered relative to its lifting rope. The proposed technique makes it possible to increase the reliability and safety of elevators during operation in case of emergency (rope breakage). In this case, the stresses (forces) in the articulated structural elements are reduced, which leads to folding of the articulated four-link joints, preventing the cabin from falling into the shaft. Any new design requires defining the geometric parameters of the device. Research methods and research results. The method for substantiating the choice of parameters of the selected articulating device, based on the condition of uniform loading of structural elements, showed that only one design position with fixed angles α = 10o, β = 70o and γ = 50o meets this condition, which makes the design inconvenient to implement during operation. Based on the standards provided for determining the basic parameters of the elevator and shaft, the main parameters of the device are determined and a design scheme is proposed. Novelty of the work. The theoretical studies are carried out to substantiate the method of selecting parameters relate to a fundamentally new design of catchers. Conclusions. Types of the safety catch design are proposed, which have higher reliability in operation as a result of an increase in the response rate of the device. The expediency of determining the parameters of the safety catch based on the condition of equal strength, rather than equal loading of its elements, are found out.