PROSPECTS FOR THE USE OF ELASTIC PRESSURE SENSING ELEMENTS IN AGRICULTURAL MACHINERY
The paper provides an overview of the research works carried out by scientists of the State Agrarian University of the Northern Trans-Urals on the development of structures of agricultural machines with flexible elastic elements. N. N. Ustinov developed designs and methods for calculating tubular springs with variable wall thickness, S. S. Samakalev proposed and studied springs with variable cross-section in length.. A. I. Chuboy obtained formulas for calculating the natural vibration frequencies of tubular springs of various designs and conducted experimental studies . It is shown that such mechanisms have a number of advantages in comparison with the known ones, and their application makes it possible to accurately comply with agrotechnical requirements for tillage and sowing, reduce energy costs when performing these operations, and reduce the load on working bodies. Examples of the use of elastic elements in the working bodies of machines for tillage and sowing machines, in particular, coulter racks, are given. At the same time, the change in pressure in the internal cavity of the elements causes the free end with a loosening paw to move. In the process of tillage, the working body of the cultivator is influenced by the resistance forces of the soil of a variable nature, which causes fluctuations in the rack. The supply of working fluid into the rack cavity under variable pressure leads to oscillatory movements of the paw with a certain amplitude and frequency. The design of the working body of the cultivator with a rack in the form of a twisted tubular spring is also described. In it, under the influence of pressure applied to the inner cavity of the spring, its free end with a paw turns around the longitudinal axis, producing loosening of the soil.