Justification of constructive technological scheme of multifunctional unit

Abstract

It is developed a multifunctional soil processing unit with interchangeable working implements in the form of flat hoes to perform the subsoil tillage at 16…25 cm or cultivator hoes for carrying out pre-sowing tillage at 5…12 cm. Experimental studies of the unit have been carried out to study the effect on its traction resistance of the parameters of flat hoes, their location according to the scheme of “direct” and “reverse” wedge on the frame of unit, the optimal position of the middle plane-cutting paw relative to the side paws. The tillage unit was aggregated with the MTZ-82 tractor. The apex angle of flat hoes has been 95° and 110°, the width of their capture was 0.76 m. Processing of winter rye stubble was carried out with the use of tillage unit on heavy loamy sod-podzolic soil at its moisture content of 23.8% and hardness in the soil layer from 1.73 to 2.36 MPa. Processing of firm cultivated soil was carried out with the use of tillage unit on medium loamy sod-podzolic soil at its moisture content of 15.2% and hardness in the soil layer from 0.54 to 2.23 MPa. The traction resistance of flat hoes with a apex angle of 110°. Installation of flat hoes in the form of a “straight” wedge and the position of the middle flat hoes with the maximum displacement relative to the side flat hoes can reduce the pulling force of the tillage unit.