| 摘要 |
<p>The invention relates to a crust breaking device for metal melts, comprising a pneumatic cylinder (1) having a cylinder housing (2), a piston (3), which is axially displaceable within the cylinder housing (2), a piston rod (4), which is fastened to the piston (3) and is guided through an opening (5) at one end of the cylinder housing (2) such that by means of axial displacement of the piston (3) the piston rod (4) is movable between a retracted final position and an extended final position. The crust breaking device further comprises an electronic control unit (6) and a valve arrangement (7), which can be actuated via the electronic control unit (6) and is connected via control lines (8, 9) to a front pressure chamber (10) and a rear pressure chamber (11) inside the cylinder housing (2). According to the invention, the device comprises at least one metal plate (12, 13) that is fixedly arranged within the cylinder housing in order to define a final position of the piston (3) or the piston rod (4), the metal plate (12, 13) and the piston (3) being electrically connected to the control unit (6) such that a contact of the piston (3) with the metal plate (12, 13) closes a circuit, which indicates to the control unit (6) that the piston (3) or the piston rod (4) have reached the final position.</p> |
