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TCD Mechanism
OCL has recently penetrated into the business of TCD mechanism

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