Check the wearof 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。
2
The wear volume loss of positive brush is more than that of negative brush.
复合材料的电磨损体积与电刷的极性有关，正刷的磨损体积大于负刷的磨损体积；
3
Washing machine washing net force, the water to achieve recycling, and brush pressure is uniform, stable car speed and direction, degree ofwear and tear on the car paint is hand washing below 30%.