| 摘要 |
<p>The hydraulic lifting arrangement has several series connected double acting piston and cylinder units. The secondary end of each unit is connected with primary end of succeeding unit with exception of the last unit. The primary end of first unit is connected to pressurised fluid source. The synchronous action of units is ensured by a leakage control system. The connection pipes (36, 37) between secondary ends (23, 24) and primary ends (21, 22) can be connected by a stop valve unit (41), to the pressurised fluid source (34). This valve unit is manually operated and its outlets (39, 40) are connected to pipes (36, 37). Its inlet is connected to pressurised fluid supply or feed line (33) to primary end (20) of the first unit (11).</p> |
