International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

An experimental model of a safety clutch has been developed and manufactured, which will improve the efficiency of screw conveyors by increasing the axial displacement of the driven half-clutch with a jammed working body, while reducing dynamic loads during overload. When conducting a multifactorial experiment to determine the moment of operation T of the safety clutch of a screw conveyor, the variable factors were the angle of inclination of the working body to the horizon α, the rotation frequency of the screw working body n, and the time of increase in the resistance moment То. Based on the results of experimental studies, corresponding regression equations, response surfaces, and their two-dimensional cross-sections were constructed to establish the influence of controlled factors on the moment of operation of the safety clutch under extreme operating conditions. The obtained regression equation can be used to determine the moment of clutch engagement during the transportation of bulk and lump agricultural materials by a screw conveyor.

The article presents the design of a finger safety clutch with axial withdrawal of a jammed screw to remove it from the overload zone. The theoretical dependences of determining the change in torque during the operation of the finger safety clutch on the angle of relative rotation of the half couplings and the design and technological parameters of the engagement elements are presented. On the basis of force and kinetostatic analysis of the coupling, the nature and magnitude of the change in their torque at all stages of relative rotation of the coupling halves were determined. The developed and manufactured prototypes of the finger safety coupling made it possible to conduct a set of experimental studies. For the safety clutch of a screw conveyor, based on the analysis of theoretical and experimental test data, the adequacy of theoretical calculations and actual values of torques during the mechanism operation was compared.

Effective use of the KhTZ-160 tractor is possible, with the specified width, combining the implementation of the main technological process with an additional, i.e. sowing with cultivation. Shows the results of calculations of the transverse displacements of the working bodies as a function of their placement along the width of unit and along its length relative to the transverse geometric axis that passes through the kinematic the center of the tractor without taking into account the curvature of the trajectory of tractor and possible changes in the position of kinematic center along the unit. The largest values of the transverse displacements of the working bodies, which are placed at a distance of 2.6 m, i.e. at the machine which is attached to the rear hinged system of the tractor, reach 14.5 cm at maximum angles of rotation of the unit (3 degrees). The smallest transverse movements of the working bodies are observed when placed on a geometric axis that passes through the axis of the rear wheels (less than 1 cm). The lateral movements of working bodies of 18-row wide-coverage row-crop unit depending on the tractor turning angle and their placement in the unit are considered. Kinematic parameters and coupling scheme are recommended.