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常用井式渗碳炉、回火炉的升降部分,都是立柱和起重架焊为一体。如果立柱密封圈处掉进硬的物质,或密封圈骨架破碎划伤
Common Pit type carburizing furnace, furnace part of the lift, are column and crane frame welding as a whole. If the column seals fell into the hard material, or broken ring broken frame