Experimental study of the elastic S-shaped cultivator rack

Abstract

Cultivating paws on elastic struts at work have a deviation from the established depth of processing by 10-15 % more than with a rigid suspension and do not preserve the optimal cutting geometry. With increasing speed and depth of treatment, tractive resistance and deflection of the paw from a given depth of processing increase. Therefore, to ensure the quality and efficiency of the combined cultivator equipped with elastic S-shaped struts, it is necessary to change the rigidity of the racks. The purpose of the study is to improve the quality and reduce the energy consumption of surface tillage by regulating and optimizing the rigidity of the elastic strut of the cultivator. To study the work of the elastic S-pillar, the method of full factorial experiment was used, which allowed obtaining mathematical models, taking into account the selected controlled factors. For the controlled variables, the factors characterizing the work properties of the elastic S-pillar and having certain numerical values were taken. In the course of the study, the influence of the depth of treatment, the speed of the aggregate and the stiffness of the strut on the traction resistance and the deviation of the paw was studied. The results of the research showed that with an increase in processing depth from 0,04 m to 0,12 m at a speed of 3 m/s, the traction resistance of the S-pillar will increase from 105 N to 670 N. It should be noted that increasing the stiffness of the rack from 6226 N/m to 21815 N/m leads to a reduction in traction resistance by 100 N. With increasing depth of processing and speed of the unit - the deviation of the toe of the paw increases. With increasing stiffness of the stand, the deviation of the toe of the paw decreases. The maximum deviation is observed at a speed of 3 m/s, a depth of 0,12 m, rigidity of the rack 6826 N/m. As a result of the study, in order to fulfill the agrotechnical requirements for surface tillage, it is proposed to install a stiffness regulator in the design of the elastic S-bar.