Justification of the dibber drill machines wheel parameters under the condition of rotation uniformity

Abstract

The article presents theoretical and experimental study results of rotation uniformity for seed drill wheel and possibilities of using wheeled dibber drills in the design of sowing machines. The main purpose of research is to obtain mathematical models of wheel dynamic model expressing the dependence of wheel sliding on the technological and design factors. The objectives were to determine rolling coefficients in order to use their numerical characteristics in the analysis of wheel dynamic model and in particularity, the axial load, wheel radius, parameters of the dibber drills wheel and speed of movement. Freely rotating wheels with a rim width of 170 mm and diameters of 524 mm and 712 mm were used in the experiments. Soil in the channel was brought close by properties to the soil prepared for sowing. Measurement of the driving force was made by strain gauge equipment at a wheel speed of 0.47 m/s. The optimal axial load at the masses of 35-55 kg and diameter in the range of 500-800 mm of the wheeled dibber drills was determined. It was proved, that wheel slip within 10-12% will assure the quality of sowing crops technological process execution at speeds up to 3 ms-1. Numerical values of wheel sliding coefficients are on average 58% lower for rolled soil than for loose soil for equal conditions.