Abstract:
Abstract: At present, the theory of the motion of the material under the electromagnetic vibration is still not perfect, which results in the lack of theoretical guidance for the optimization of the directional arrangement device of corn seeds based on circular electromagnetic vibration. To solve this problem, the theoretical research on the movement characteristics of single corn seed under the circular electromagnetic vibration was carried out in cylindrical coordinate system, and the working angle amplitude, the occupied circle radius of corn seed and the angular velocity of corn seed's forward circular motion were taken as the main parameters in this paper. And the theoretical research consisted of 2 main parts: relative motion theory and self motion theory. Then, the practical experiments on single corn seed were carried out under 2 conditions of embryo face up and down. The practical experiments included 3 parts: the relative motion characteristics test, the self motion characteristics test and the forward circular motion characteristics test. The state changes of relative motion, self motion and the size changes of the angular velocity of corn seed's forward circular motion were observed under different working angle amplitude and occupied circle radius of corn seed in each test. The theoretical analysis could be verified and supplemented by the practical experiments. The following results were gained: 1) The relative motion characteristics of single corn seed showed that under the electromagnetic vibration there were 4 primary movement states: forward circular motion, reverse circular motion, throwing motion and centrifugal motion, and there were also 4 critical angle amplitudes respectively corresponding to the states. It meant that when the working angle amplitude of circular electromagnetic vibrator reached each critical angle amplitude, the single corn seed would carry out the corresponding movement. The effect of the embryo's direction of single corn seed on 4 critical angle amplitudes was very small. The critical angle amplitude corresponding to throwing motion was always kept to equal to 0.012 9 rad, but the other 3 critical angle amplitudes were related to the occupied circle radius of corn seed, and the relationship was that they would decrease with the occupied circle radius of corn seed increasing. Besides, the critical angle amplitude corresponding to throwing motion was larger than that corresponding to reverse circular motion and then that corresponding to forward circular motion at all time. 2) As the self motion characteristics of single corn seed revealed, the embryo's direction of single corn seed had obvious influence on self motion law of corn seed. The law was that corn seed could adjust its tip orientation concordant with the tangent line of the circular movement by self reverse or forward rotation when its embryo faced up, but the tip orientation of corn seed would be random without a clear law when its embryo faced down. 3) As the forward circular motion velocity characteristics of single corn seed revealed, when the embryo faced up, the angular velocity of corn seed's forward circular motion was always larger than that when the embryo faced down before the amplitude of circular electromagnetic vibrator reached 0.008 rad; the angular velocity of corn seed's forward circular motion could increase with the increase of the angle amplitude, and after 0.008 rad it could decrease regardless of the embryo's direction. The best working angle amplitude of circular electromagnetic vibrator was 0.008 rad, and under this condition, the angular velocity of corn seed's forward circular motion could reach the maximum (4.15 °/s when the embryo of corn seed faced up and 4.03 °/s when the embryo of corn seed faced down). This research enriches the movement theory of materiel under the circular electromagnetic vibration, and provides the theoretical reference to the optimization of directional arrangement device for corn seeds.