Patent ID: 6938625

Claim:
A load sensing system for a log washer for washing aggregate materials, comprising: a log washer tank having a pivotally mounted lower end and having an upper end; a pair of hydraulic cylinders, each hydraulic cylinder having a cylinder base depending from the upper end of the log washer tank and a piston rod attached to a fixed ground support, the hydraulic cylinders being disposed on opposite sides of the log washer tank; a combiner/divider valve connected to the pair of hydraulic cylinders; a hydraulic pump and a hydraulic fluid reservoir connected to the combiner divider valve for pumping fluid to and receiving fluid from the combiner/divider valve for extending and retracting the piston rods; a high/low pressure sensor switch disposed between said hydraulic pump and said combiner/divider valve, the sensor switch having a first state when hydraulic pressure exceeds a high pressure limit, a second state when hydraulic pressure falls below a low pressure limit, and a third state when hydraulic pressure is between the high pressure and low pressure limits; raising means for extending the piston rods of the pair of hydraulic cylinders when hydraulic pressure falls below the low pressure limit; and lowering means for retracting the piston rods of the pair of hydraulic cylinders when hydraulic pressure is above the high pressure limit; whereby the log washer tank is raised and lowered to an angle of incline with only the aggregate material load for promoting efficient washing in response to changes in weight of the load.