WORKING TOOL OF APPARATUS FOR SPREADING FERTILIZER FROM PILES Russian patent published in 2001 - IPC

FIELD: agricultural engineering. SUBSTANCE: working tool for spreading organic fertilizers from fertilizer piles which had been preliminarily laid on field has rotors rotating in opposite directions, and shield disposed under rotors. Shield is urged to vibrate by double-action hydraulic cylinder provided with built-in distributing valve and connected with hydraulic drive. The latter has hydraulic drive-sensor with stem coupled to spreader frame and casing coupled to hydraulic cylinder casing. Hydraulic drive is further provided with hydraulic accumulator and two-position hydraulic distributing valve with opposite hydraulic control mechanisms. When slide of hydraulic drive is in first position, hydraulic drive provides communication between pressure and drain hydraulic lines with cavities of hydraulic cylinder, and when slide is in second position, hydraulic drive disconnects mentioned lines from mentioned cavities. Piston cavity of hydraulic cylinder-sensor is communicated with two hydraulic control mechanisms of two-position hydraulic distributing valve and with hydraulic accumulator. EFFECT: reduced power consumption and enhanced reliability in operation. 3 dwg