| 摘要 |
A crust breaker for breaking through the crust (17) formed on a metal melting bath (18) is proposed, with a fluidic double-acting cylinder (10) with a piston rod (14) provided with an impact element (16), and which has two operating chambers (12, 13) separated by a piston (11) and able to be supplied with either a higher (P2) or a lower (P1) fluid pressure by means of a valve assembly (33, 36). The cylinder (10) is provided with a position measuring unit (24). Monitoring means are provided for monitoring a presettable distance-time curve or a presettable speed curve during the forward movement of the impact element (16) towards the crust (17). A control unit (30) is provided to switch over from the lower to the higher fluid pressure after a detectable deviation from the prescribed course, and is connected to the valve assembly (33, 36) for this purpose.
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