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改进后,采用图示的组合式滚棒。该结构克服了上述缺点,且各个零件可选用不同材料制造,滚棒磨损后只需更换套筒。
After the improvement, using the combination of the graphical bar. The structure to overcome the above shortcomings, and various parts can be made of different materials, roller wear only need to replace the sleeve.