Gud V. Mechanical-technological basis of multifunctional sectional screw conveyors development for grain material

The thesis under discussion is devoted to the scientific problem solving dealing with the development of mechanical-technological basis of multifunctional sectional screw conveyors and their components for simultaneous performance of different types of transport-technological operations in agricultural production, with generating, by means of structural-scheme synthesis, progressive designs, with further substantiation of their functioning on the basis of the developed mathematical models and conducted experimental research and also with the substantiation of their operation modes. The mechanical-technological basis of multifunctional sectional screw conveyors development for grain material has been developed in the thesis under discussion. Some alternative designs of multifunctional sectional screw conveyors have been generated in the paper with possibilities of technological transformation and flexibility of the material overloading trajectory according to certain types of operations performance using structural-functional synthesis of hierarchy groups. Some mathematical models of the system “sectional (telescopic) screw conveyor- granular medium” dynamics have been developed and the dynamic processes taking place in the operation of telescopic screw conveyors of agricultural granular materials have been studied under non resonant and resonant vibrations conditions. Some mathematical models of the system “conveyor screw- grain material and the process of separation” dynamics have been developed and the study of the process of simultaneous grain mixture transportation and separation by a screw conveyor has been conducted including the determination of the system under discussion parameters different values impact on this process. Some mathematical models of bending vibrations dynamics of a screw loader-mixer high-angle screw have been developed and the influence of different values of the given system parameters on amplitude-frequency characteristics has been described. The models of agricultural granular materials mixing process by a screw loader-mixer have been developed and the influence of design-technological and performance parameters on this process has been determined. The conducted experimental study of the processes dealing with the conveyor screw extension (shortening) in the telescopic screw conveyor has proved that the biggest problem of these conveyors is keeping to the same clearance between the case and the spiral in different sections of the telescope. The experimental tests have been done to determine the overloading production capacity by mobile screw multifunctional transporters with agricultural loads and also the power consumption of the processes and the values of torques on their worm gears have been studied. The efficiency of agricultural materials separation by multifunctional screw conveyor-separator has been studied and it was found that the bigger inclination angle of the tool under permanent specific load conditions is, the smaller is the efficiency of separation. During the study of the process of mixing by multifunctional screw conveyor-mixer it was found by experiments that the mixtures heterogeneity is increasing directly as the frequency of blade screws rotation and it was the smallest in case of using the augers with multidirectional angle of blades deflection. The engineering procedure of multifunctional sectional conveyors design for grain material has been developed. Some new designs of multifunctional sectional conveyors for grain material covered by 24 utility model patents of Ukraine have been presented. The obtained scientific and practical results, techniques and recommendations have been used and implemented at numerous national enterprises.