Round Pin Shackles are considered un-safe as the cotter pin, if removed or not installed, falls off during a lift can cause the shackle to fail. 圆销钩环被认为是不安全的,因为如果开口销被拆除或未安装,或者在提升中脱落,将造成钩环失效。
PLC Control of Pin Climbing-Rod Hydraulic Self-Lift Ocean Oil Boring Platform 插销爬杆型液压自升式海洋石油钻井平台PLC控制