Pneumatic actuator system
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United States of America Patent
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-
Aug 17, 2004
Grant Date -
Sep 18, 2003
app pub date -
Feb 11, 2003
filing date -
Aug 15, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pneumatic actuator system is provided which includes one or more piston-cylinder type actuators (14) intended for crust breaking operations at electrolytic alumina reduction baths. Each actuator (14) includes a working piston (21), and a piston rod (22) carrying a crust breaking working implement (17). A control circuit having a directional valve (24) is arranged to operate the actuator piston (21) in alternative directions. The control circuit includes air feed flow restrictions (26, 27), end position sensors (28, 29) and air feed shut-off valves (30, 31) for minimizing the pressure air volume needed for accomplishing complete working strokes of the actuator piston (21) at varying crust layer thickness.
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