C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 9/00 (2006.01) F27D 25/00 (2010.01) B02C 1/00 (2006.01) C25C 3/14 (2006.01) C22B 21/00 (2006.01)
Patent
CA 2704506
A crust breaker for metal melts, has a fluid-actuated, double-acting crust breaking cylinder with a pressure chamber on the cap end, a pressure chamber on the bottom end, a piston, and a piston rod mounted on one side. The piston face on the end toward the piston rod has a lesser effective diameter than the opposed piston face. On the basis of a signal to a valve assembly associated with the crust breaking cylinder, an extension motion of the piston rod can be initiated with a positioning force. A determining mechanism for ascertaining that the metal melt has a crust is provided. On the specification of the determining mechanism, a further extension motion of the piston rod can be introduced with a breaking force that is greater than the positioning force. A sensor for detecting a fully extended state of the piston rod is provided. On the specification of the sensor, a retraction motion of the piston rod can be initiated. The sensor has at least one pneumatic multiposition valve.
Borden Ladner Gervais Llp
Robert Bosch Gmbh
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