The theoretical substantiation of constructive parameters of the vibration digging working body

Abstract

Goal. To substantiate the rational constructive length of the working channel of the vibrating digging working body by interaction with the body of sugar beet root during its digging out of the soil. Methods. Theoretical research was conducted using the basic provisions of the theory of agricultural machinery, higher mathematics, and theoretical mechanics. Numerical calculations and graphical dependencies are obtained using a PC based on developed and standard programs. Results. The calculated scheme of root crop contact with the working body is constructed and the analytical dependence of the number of vibrations of the vibrating digging working body on interaction with the root crop, during its stay in the area of the rear part of the digger working channel, on the length of the rear part digger. Based on the conducted analytical researches the expression for determination of the minimum admissible frequency of fluctuations of a working body under the condition of maintenance of obligatory capture of each root crop by digging plowshares is received. Conclusions. As a result of calculations, it is determined that for the length of the rear part of the working channel of the digger 0.1 m and the translational speed VP = 2.1 m/s the oscillation frequency n = 20.3 Hz provides a satisfactory mode of vibratory digging of roots. The frequencies n = 15.7 Hz and n = 8.5 Hz have an insufficient effect. At the same length of the rear part of the working channel and translational speed VP = 1.3 m/s the frequencies n = 20.3 Hz and n = 15.7 Hz provide a satisfactory mode of vibratory digging of roots, and the frequency n = 8.5 Hz — insufficient (some roots are not removed by the working body or broken in the tail). To ensure a satisfactory mode of vibratory digging of roots at the speed of translational movement of the digger VP = 2.0 m/s and the oscillation frequency of the working body n = 10 Hz, it is necessary that the length of the rear of the working channel of the digger is 0.2 m. The range of permissible oscillation frequencies of the working body is determined, which can be recommended for translational speeds in the range of 1.3–2.2 m/s, taking into account the limitation of oscillation frequencies of the working body under conditions of obligatory capture of each root crop by digging plowshares.