| 摘要 |
A pneumatic actuator system including one or more piston-cylinder type actuators (14) intended for crust breaking operations at electrolytic alumin a reduction baths, each actuator (14) having a working piston (21), and a pist on rod (22) carrying a crust breaking working implement (17), and a control circuit including a directional valve (24) is arranged to operate the actuat or piston (21) in alternative directions, wherein the control circuit comprises air feed flow restrictions (26, 27), end position sensors (28, 29) and air feed shut-off valves (30, 31) for minimising the pressure air volume needed for accomplishing complete working strokes of the actuator piston (21) at varying crust layer thickness.
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