Dubynyak T. Justification of structures and parameters of protective mechanisms of flexible screw conveyors

The dissertation is devoted to substantiation of structures and parameters of flexible screw conveyors with mechanisms of protection against overloads. To solve the problems, a complex of theoretical and experimental investigations of the processes of elastic-safety couplings and load-protection nozzles during overloading of flexible screw conveyors was carried out. The analytical dependences for determination of constructive and kinematic parameters of elastic-safety couplings concerning the moment of their operation are deduced. The influence of the basic parameters on the dynamics of operation of the elastic-safety coupling in the mode of overloading of the screw of the flexible screw conveyor is established. The influence of gaps on the force of contact interaction in the details of the conveyor drive is investigated and the influence of structural parameters on the dynamics of the mechanical system of the propeller conveyor drive is established. For carrying out of experimental researches an elastic-safety clutch and a loading and protective packing of a flexible screw conveyor are developed and made. An experimental installation and a method for determining the relationship between the structural and power parameters of the elastic-safety coupling of a flexible screw conveyor, as well as its operational characteristics, have been developed. It has been established that the elastic-safety coupling provides a smooth start of the auger during start-up of the drive and reduces the dynamic loads on it during overload, and the dynamics of the investigated coupling compared with the variant of the traditional coupling of the impulse type is smaller in 1,21-1,29 times.