Issues related to re-engineering of the intermediate roller table of a four-strand continuous bloom caster are discussed. To make the table more reliable and facilitate its maintenance, it is proposed that all the rollers be relocated outside the hot zone of the mill. This can be done by using transmission shafts to connect the journals of the rollers with the output shafts of the table's motor-reducers. Keywords: continuous caster, intermediate roller table, roller drive.The problem of replacing imports with Russian-made products has become of acute importance for many sectors of the nation's industry. Ferrous metallurgy commonly makes steel and semifinished products by using machines and equipment produced by well-known foreign companies. Since the products of Russian metallurgical plants are vital to national security, sanctions may need to be imposed on the shipment of spare parts, consumable materials, and other elements of equipment.One important problem facing the metallurgical industry is ensuring the reliability of the equipment that it uses. This problem is being addressed by re-engineering or replacing the equipment that has become obsolete.This article examines the intermediate roller table of a continuous bloom caster in the electric steelmaking shop of Ural Steel [1]. The table has four lines (strands) of seven rollers each and transports metal from a stretching-straightening machine to a gas cutter (Fig. 1). The diameter of each roller is 320 mm, the length of the body of the roller is 580 mm, and the weight of the roller is 231.5 kg.Each of the rollers 5 is driven by a motor-reducer 1 (Fig. 2). Rollers 5 are secured in bearings 3 and 7, which have cooled housings; heat shields 4 and 6 are also provided. The rollers are internally cooled with water, which is delivered through hoses and rotating unions 8. Motor-reducer 1 is attached to the journal of roller 4 and secured in the frame with the aid of spacers 2.One shortcoming of the existing design of the intermediate roller table is that the drives are located in the table's high-temperature zone. This often leads to jamming of the teeth on an individual drive due to the high temperatures. In addition, the entire table has to be taken out of service to fix any roller that malfunctions.It was proposed in [1] that the drives of the rollers be moved out of the high-temperature zone (Fig. 3a). In this case, the drive of any roller could be repaired without shutting down the entire table. It was also suggested that the drives of the rollers of the outermost lines (lines 1 and 4) be left unchanged but that the couplings between the journals of the rollers and the motor-reducers be mirror-juxtaposed from the hot inner zone to the cooled outer zone. The type of motor-reducer that is used is also left unchanged. It has the following characteristics: power 4 kW, output speed 28.5 rpm, nominal torque 1213 N·m, output-shaft diameter 70 mm.Relocation of the drives of the rollers of the middle (second and third) lines outside the hot zone is also being considered...
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