婷婷五月俺也去人妻,99久久国产精品麻豆,国产福利资源网在线观看,香蕉视频国产精品,麻豆视传媒官方短视频网站

ladder making machine-JYJ

    "D"-shape and "O"-shape rung with "C"-channel or " I "-shape profile by squeeze machine.

1. First processe by squeeze machine model "JYJ" to swage, to make double corrugation on profile.


2. Second step is to assembly the profile and put on another machine to squeezing outside of profile.


 After above 2 steps that will finished single section ladder and it can joint extension ladder.

 

PRE:
NEXT:
日韩视频在线观看| 免费大片黄国产在线观看| 六月丁香综合在线视频| >