DESIGN PROCEDURE OF THE ELEVATOR CATCHER PARAMETERS

Objective: the proposed improved catcher design is an articulated mechanism that is easy to manufacture and maintain and is activated automatically due to internal forces generated in the rods of the system. In operating mode, the device is a rigid structure and the forces arising in the structural elements do not allow it to lose its rigidity, which is ensured by the operation of the springs. When the rope breaks, the forces in the structural elements decrease, which leads to the "folding" of the articulated system. Reliable operation of the proposed device is ensured by a reasonable choice of geometric parameters of the structure in question, based on the initial conditions that ensure the operation of the elevator: the operating lowering speed, as the most unfavorable position in case of rope breakage. Research methods: the solution to the problem is to select the parameters of the catcher based on the size of the elevator cabin, the size of the shaft and the weight of the elevator. The novelty of the work: the theoretical study of the trajectory of the proposed device elements, the determination of the movement of some rod points responsible for the rate of the system opening in case of rope breakage allowed to obtain mathematical models for subsequent evaluation of the proposed device for all types of elevators. Study results: the approbation of the obtained models made it possible to determine that the fall time to the moment of the proposed catcher opening, which prevents further movement of the elevator cabin in the shaft, is about 0.5 s, provided that the operating speed of the elevator is 1 m/s. The distance to which the elevator will descend will be 1.237 m. Conclusions: the conducted research allowed to propose the design procedure of the parameters of the elevator catcher based on the conditions of the overall dimensions of the elevator, the size of the shaft and the forces arising in the structural elements.