优化钢铁热轧精轧前除磷箱的构造

Optimized hot rolling descaling box structure before finishing rolling

精轧前除磷(即去除粗轧后板坯表面的氧化铁皮)是钢铁热轧轧线的关键环节。针对目前普遍采用的高压水喷射除磷所存在的除磷箱框架整体薄弱及夹送辊牌坊出现变形导致夹送辊运行不畅且拆装困难,除磷箱本体立柱及牌坊部位受高压水冲刷出现凹槽及腐蚀严重,夹送辊油缸设计不合理导致故障率高,以及除磷辊传动机构标高不一致等问题,本文作者对精轧除磷箱整体结构及布局进行优化,将夹送辊牌坊设计成U型结构并增加强度来保证夹送辊运行稳定,对除磷箱本体易冲刷部位增加防护衬板、优化夹送辊油缸的安装连接方式从而降低油缸故障率,整体优化除磷箱夹送辊、除磷辊、气动液压装置等液压润滑系统和增加辊道冷却等改进措施,提高精轧前除磷箱的整体功能和性能,满足现场生产需求,提升产品质量。

Phosphorus removal before finish rolling(remove the oxide iron on the surface of the slab after rough rolling)is the key equipment of hot rolling line.In view of the weakness of the frame of the phosphorus removal box and the deformation of the pinch roll arch existing in the high-pressure water jet phosphorus removal,the operation of the pinch roll is not smooth and the disassembly and assembly is difficult,the main column and archway of the phosphorus removal box are grooved and corroded by high pressure water,the unreasonable design of the roller cylinder resulted in a high failure rate,and the inconsistent elevation of the phosphorus removal roller transmission mechanism.In this paper,optimizing the overall structure and layout of the dephosphorization box in finishing rolling,using the U-shaped structure and increasing the strength of the pinch roll arch to ensure the stable operation of the pinch roll,adding the protective lining plate to the parts easy to be washed out of the dephosphorization box body,optimizing the installation and connection mode of the pinch roll oil cylinder,so as to reduce the failure rate of the oil cylinder.Optimize the hydraulic lubrication system such as pinch roll,dephosphorization roll and pneumatic hydraulic device of dephosphorization tank as a whole and increase the cooling of roller table and other improvement measures,improve the overall function and performance of dephosphorization tank before finishing rolling,meet the production demand on site and improve the product quality.