Substantiation of rational constructive parameters of the chisel subsoiler for autumn tillage of stubble field to tractors of the 8 drawbar category

The article presents the results of theoretical and experimental studies to substantiate a rational distance from the point of connection of the implement with the tractor to the axis of rotation of the support wheels and the distance from the axis of symmetry of the frame in the horizontal plane to the point of connection of the hitch with the frame in the vertical plane. Theoretical studies have established that the stability of the working bodies during the process of soil sowing (soil hardness of at least 6 MPa) will be provided at a distance from the point of connection of the implement with the tractor to the axis of rotation of the support wheels equal to 4,3-5,3 m. The distance from the axis of symmetry of the frame in the horizontal plane to the point of connection of the hitch with the frame should be in the range 0-300 mm. During experimental studies, the state of the soil at a processing depth of 0-30 cm corresponded to the following average indicators: soil hardness 4,8 MPa, humidity 16,3 %, bulk density 1,39 g/cm3. The tests in the farm conditions were carried out at the travel speeds of 7,2; 8,9 and 10,0 km/h. The depth of tillage with the chisel was 28,5-29,7 cm, with the disc tillage tools 8,8-9,5 cm. At the working width of 8.8 m and travel speed of 8,9 km/h the working capacity of the aggregate per 1 hour of the basic time is 7,8 ha, draught resistance is 82,3 kN. The fuel consumption per hour was 76,2 kg, while 9,7 kg is consumed per hectare. The power consumed to overcome the draught resistance of the implement is 203,5 kW. The stability of the technological process in terms of tilling depth and draught resistance indicates the validity of the selected constructive parameters of the chisel subsoiler for autumn tillage of stubble field.

rational distance, location coordinates, soil chiselling, agrotechnical, energy indices