| 摘要 |
1,154,329. Continuous casting-machines. UNITED STATES STEEL CORP. 16 Aug., 1966 [1 Sept., 1965], No. 36674/66. Heading B3F. [Also in Division F2] In a continuous casting apparatus including a mould 10, guide rollers 13, withdrawal rolls 30 and vertically spaced water sprays 20-29, the water sprays 20-29 are sequentially shut off by valves 40-49 as the tail end of the casting 11 passes each spray to prevent overcooling of the end of the casting 11. The means for shutting down the sprays comprises a pulse source 60 mechanically driven by the withdrawal rolls 30 and a reset counter 62 that, after a predetermined number of pulses have been received from the pulse source 60, sends out a secondary pulse that incrementally rotates a drum controller 63 that operates sequentially, by means of preset pegs 65, cam followers 70- 79. The cam followers 70-79 close microswitches 80-89 to energize actuators 50-59 that shut off the valves 40-49, which may be simple on-off types or variable opening types. The shut down means is brought into operation when the tail end of the casting 11 leaves the mould 10, either manually by push-button 90 or automatically by using a suitably arranged radiation pyrometer or a strain gauge or load cell device affixed to the uppermost guide roll 13. |
