在隧道炉上方的旋转除锈器目的是为了清除不均匀分布的锈斑和残留的铸造渣。
Rotary de-scaling upstream of the tunnel furnace aims at the removal of heterogeneously distributed scale as well as residuals of casting slag.
用可编程序控制器控制钢管壁面喷砂除锈作业线，提高了自动化程度，操作方便，运行可靠。
The application of programmable controller enhances automatic grade of sand jet line of production with convenient operation and reliable performance.
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