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TCD Mechanism
OCL has recently penetrated into the business of TCD mechanism
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| OCL has recently penetrated into the business of TCD mechanism for changing Sub-entry nozzle (SEN) without terminating casting, in collaboration with an Italian Company |
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| Types of Mechanism |
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ZKB system – where flow control of steel from tundish to mould is done by Monoblock stopper |
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HK1 system – where flow control of steel from tundish to mould is done by Slide plates |
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| Refractories Used |
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In ZKB system - MBS, SEN, Tundish nozzle and well block |
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In HK1 system - SEN, Tundish nozzle, well block and 3 slide gate plates in which the top and bottom plates are stationery and the middle plate moves to control the flow of steel |
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| Special Features |
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SEN can be changed any number of times, hence casting sequence can be increased to a great extent, may be upto 30 heats |
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SEN can be changed in less than 1 second without any disruption of steel flow |
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SEN can be changed without lowering or lifting of tundish |
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Re-oxidation of steel can be prevented at the refractory joints by effective Argon purging system |
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Blank plates are provided to discontinue casting in case of emergency situations, which ensures safety |
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Enhancing cost-effectiveness in refractories leading to economic benefit |
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This is a tailor-made product and hence can be fixed under any tundish with minor modifications |
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It has a compact structure with average dimensions 900 x 600 x 300 mm3 |
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Cylinders for pushing SEN or slide plates are operated hydraulically and hence no jerking occurs that prevents any chance of SEN breakage |
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Spring checking equipments and SEN handling devices during changing will be provided along with the mechanism for safer operation |
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| Advantages of the mechanism |
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Less down time of tundish as all the mechanism parts are not dismantled after each casting |
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Higher life of mechanism which is more than 2000 hours of casting |
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Higher life of springs which is more than 1000 hours of casting |
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Low maintenance time |
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To avoid any steel leakage. Disc type springs are provided that maintains a face pressure of 1.5 MT in between tundish nozzle and SEN and 5 MT in between the slide plates |
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Springs are high temperature resistant and can operate upto 450 deg C |
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Nozzle diameter can vary over a vast range of 60 mm to 100 mm |
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| ZKB System |
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| HK1 System |
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