| 摘要 |
A dart-assembly for piercing open a blockage in the opening of a ladle for holding and transporting molten steel is mounted in the outlet bore of a slide-gate associated with the ladle opening. The assembly has an outer steel housing; mounted within the housing is a dart-member having an elongated rod, which rod has a lower threaded end for receiving a threaded nut. The upper end of the rod is provided with a dart-like head-portion which actually contacts and pierces through the blockage in the opening of the ladle when the dart-member is fired. A compression spring is telescopingly mounted about most of the length of the elongated rod of the dart-member, between the enlarged dart-like head-portion and the upper, flat-surface of a stop member. A restraining nut is screwed onto the lower, threaded end of the elongated rod of the dart-member, whereby the dart-member is prevented from being fired until the restraining nut is removed, which removal occurs only after the assembly has been emplaced within the outlet-bore of a slide-gate associated with the ladle. The open, upper top of the housing is closed off by a pivotal flap, which flap is pivoted open to allow for the firing of the dart-member only when the slide-gate has been moved to its completely open position where its bore is in complete alignment with outlet-bore of the well-block.
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