所述制动装置在所述弹簧30和至少一轨道36之间具有一制动器，用以限制所述电刷沿轨道的运动范围。
The braking device is provided with a brake between the spring 30 and at least one of the tracks 36, and the brake is used for restricting the movement range of the electric brush along the tracks.
所述制动装置在所述弹簧30和至少一轨道36之间具有一制动器，用以限制所述电刷沿轨道的运动范围。
The braking device is provided with a brake between the spring 30 and at least one of the tracks 36, and the brake is used for restricting the movement range of the electric brush along the tracks.
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