Study of compacting surface wear of a soil packer

The issue of performance criteria of soil packers of tillers is discussed. The main function of the soil packers is breaking of lumps and soil layers into finer fractions. The greatest wear of the working elements occurs at the places where the bearing housing is attached to the roller shaft. The wear resistance of the working elements of a soil packer is studied, namely the interface at the sealing point of the bearing assembly. The necessary conditions for optimal operation of the shaft-bearing interface of the soil packer which affect its service life and operating time are described. To simplify the repair of soil packers, the design uses replaceable trunnions which are installed on the roller shaft without welding which allows quick changing of interchangeable elements in the event of a failure and its complete wear. Simplification of the design entails a change of the acting forces on the interface unit which significantly affects the wear process and operating time. During operation, the working mating surface wears out and, as a result, the gap increases. As a result, abrasive materials enter the bearing assembly interface accelerating the wear process. The operational parameters of the sealing elements of the shaft-bearing interface were evaluated. The results of evaluating the compliance of the obtained wear data with the normal distribution law are presented. Results were obtained that make it possible to establish the correspondence of experimental observations of wear of the friction surface in the shank interface. The mathematical expectation and dispersion are determined.