ELEKTRONISCHE VORRICHTUNG ZUM MESSEN UND STEUERN BEIM VERDICHTEN VON ERNTEGUT.

摘要

An agricultural baling machine controls the density of bales of crop material discharged therefrom by monitoring the stress experienced by a reciprocably driven plunger assembly (22) employed to apply a compactive force to crop material introduced into a bale case (20). The bale case (20) is comprised of rails (54, 56) which are positionably adjustable in response to applied tension in a manner whereby the dimensions of the bale case (20) are changeable, thereby facilitating a change in the degree of resistance caused by the bale case (20) to crop material movement therein. Signals produced by stress sensors (124, 126, 128, 130) mounted relative to the plunger assembly (22) are analysed by a programmed signal processor (200) which accordingly generates a control signal for controlling a servo valve (61). In response to the control signal the servo valve (61) governs the degree of tension applied to the bale case rails (54, 56) and thereby adjusts the degree of resistance to crop movement in the bale case (20). The analysis performed by the signal processor (200) results in the generation of a pulse width modulated control signal that enables the servo valve (61) to adjust the degree of resistance to crop movement in the bale case (20) so that the stress experienced by the plunger assembly (22) is maintained near a predetermined level in accordance with desired bale density.