The upgraded drum lockingdevice has integral drum locking blocks and a float screw rod, with the antivibration performance improved and the thread clearance eliminated.
改进的穿孔机转鼓器结构，采用整体压鼓块和浮动丝杆，消除了螺纹间隙，提高了抗振性能。
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With the upgraded lockingdevice the axial force of the screw rod is reduced by half when roiling, Which makes the drum locked more reliably.