CASE

PC520-9, equipped with Cummins engine, because of the energy saving effect of this excavator, the customer repurchased 4 units again.

Energy-saving principle: When the boom is lowered, the oil in the large cavity of the boom enters the accumulator, and the energy is recovered and stored; when the boom is raised, the oil in the accumulator is converted into high-pressure oil through the conversion device and sent to the boom cylinder, and the energy is obtained. release and exploit. At this time, only one pump of the hydraulic main pump is about 40% for the boom to rise. The other part of the flow is supplied from the accumulator, the regular mode requires two pumps to supply the boom cylinders simultaneously.