双速千斤顶(附图),可进行大距离快速调整和小距离慢速调整。它适合单件小批生产使用,可缩短大量辅助工时。双速千斤顶,常态时,借片簧6的力,通过手把5使对合螺母3夹紧。这种千斤顶调整方便。快调时,将手把5往内一压,对合螺母3松开,升降螺杆1可提上推下,调好 Two-speed jack (with photos), can be quickly adjusted for large distances and slow adjustment of small distances. It is suitable for small batch production, can shorten the number of auxiliary work hours. Double-speed jack, normally, by the force of the leaf spring 6, through the handle 5 so that the clamping nut 3. This jack adjustment easy. Fast tone, the handle 5 inward pressure, the nut 3 loose, lifting screw 1 can be pushed up, adjust good