braking jack ; brake jack
... 千斤顶桩 jacked pile 制动千斤顶 braking jack ; brake jack 伞齿轮千斤顶 bevelgearjack ...
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放松制动器,重物即可自行快速下降,缩短返程时间,但这种千斤顶构造较复杂。
Relaxes the brake, the heavy item then voluntarily fast drops, reduces the return trip time, but this kind of hoisting jack structure is complex.
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自降螺旋千斤顶的螺纹无自锁作用,装有制动器。
From falls screw jack's thread non-self-locking action, is loaded with the brake.
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