A New Electrohydraulic Hybrid Energy-Saving System Used on the Reversible Rolling Mills

Figure 4

Schematic diagram of electrohydraulic hybrid drive energy recovery system based on the reversible rolling mills: 1, main drive motor M1; 2, electromagnetic clutch YC1; 3, work roll; 4, torque speed sensor; 5, electromagnetic clutch YC2; 6, variable displacement pump/motor; 7.1 and 7.2, 21, 24-relief valves; 8.1–8.4, electromagnetic ball valves; 9.1 and 9.2, 22-one way valve; 10, hydraulic reversing valve; 11, 25-pressure sensor; 12.1–12.4, safety ball valve; 13.1 and 13.2, high-pressure accumulator; 14, temperature sensor; 15, liquid level gauge; 16, cooler; 17, high-pressure oil filter; 18, oil pump motor unit (M2 is the drive motor for the oil refill pump); 19, flowmeter; 20, oil suction filter; 23.1 and 23.2, low-pressure accumulator; 26, shut-off valves.