国产黄色网站在线免费观看_99久免费精品视频在线观看_亚洲αv在线观看天堂无码_欧美亚洲日韩国产综合

Through the expansion and collapse cylinder make the wedge shaft for axial reciprocating motion, the piston on the wedge shaft for radial motion, so as to realize the expansion of the segment, and the T-shaped hook on the wedge shaft pulls the expansion and contraction plunger to move inward. The hook on the outside of the expansion and contraction plunger pulls the segment back, thereby realizing the shrinking of the reel. The inside of the reel is designed with a water cooling channel, and the cooling effect is better.