The invention discloses a hydraulic
system for a sand
washer. The hydraulic
system comprises an
oil tank, a first motor, a second motor, a first
oil pump, a second
oil pump, a first filter, a first valve group, a
water cooler, a second filter, a second valve group and a third motor, wherein an
air filter, a temperature sensor, the first filter and a floating ball liquid-level meter are arranged on the
oil tank; an electromagnetic overflow valve, a
pressure stabilization valve, a blockage
alarm device and a pressure adjustment valve are arranged on the first valve group. According to the hydraulic
system, the oil pumps are driven by the motors; hydraulic oil enters a
hydraulic motor through a valve block to drive a roll
crusher to rotate, so that overload of the motor can be effectively prevented, and the service life of a main unit is prolonged; the filters can keep the hydraulic oil clean and not polluted; the
water cooler can cool the hydraulic oil; the stability of the work of the hydraulic system is improved, and the service lives of parts are prolonged; a liquid level switch can sound a high-liquid-pressure alarm and a low-liquid-pressure alarm to prevent the liquid level of the oil liquid from being too high or too low.