Check the wear of the electric brush and see whether the constant force spring has distorted or not. Over-worn electric brush and distorted force spring should be replaced.
检查电刷磨损情况，及恒力弹簧是否变形，电刷磨损过多或恒力弹簧已变形予以更换。
Constant force spring hanger is a device which puts invariable tension on the thing it hangs in limited displacement.
恒力弹簧支吊架是一种在限定位移内对被支吊物施以恒定张力的装置。
Constant force spring hanger is a device which puts invariable tension on the thing it hangs in limited displacement.
恒力弹簧支吊架是一种在限定位移内对被支吊物施以恒定张力的装置。
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