| 摘要 |
<p>A crank press, wherein the power of an electric motor (9) is transmitted to a crankshaft (1) and a connecting rod connected thereto through a clutch (7) to lower a slider (3) and a brake (6) coupled to the crankshaft (1) slows down and stops the ascending slider (3) at its top dead point at the end of each cycle, comprising (i) an oil-hydraulic pump/motor (10) which engages the crankshaft (1) through gears (11,12), (ii) an accumulator (13) which is connected to the oilhydraulic pump/motor (10) by oil paths a, b and c, and (iii) first and second switching valves (SV3,SV4) which switch the oil flow between an energy-absorbing mode to feed hydraulic oil to the accumulator (13) through the oil-hydraulic pump/motor (10) and an energy-releasing mode to feed hydraulic oil from the accumulator (13) to the oil-hydraulic pump/motor (10).</p> |
