Abstract:

A new rotary limit device of gear and rack structure is designed for segment erectors. The position limit function is achieved by converting the rotary motion into translation motion so that the contact point on the rack can contact with the limit switch. The application results show that, compared to the rotary encoder limit devices equipped on imported shield machines, the new rotary limit device has such advantages as being more simple, more reliable and more cost-effective.

Key words: segment erector, rotation limit, 3D simulation