DERRICK LIFT SYSTEM OF OFFSHORE STRUCTURE

摘要

Disclosed herein is a derrick lift system of an offshore structure. The derrick system can improve drilling workability by enabling safe and easy height adjustment of a derrick using an adjustment unit, and can improve structural stability by lowering the center of gravity of the derrick through the height adjustment of the derrick, as occasion demands.

主权项

1. A derrick lift system of an offshore structure, comprising:
a base plate secured to a drill floor and having a locking groove formed on one side thereof; a gearbox placed at one inner side of the base plate and coupled to a drive motor; a relay gear rotably mounted on the base plate to engage with the gearbox; a pinion rotably mounted on the base plate to engage with the relay gear; a post supporting a lower end of the derrick to lift or lower the derrick and provided to the other inner side of the base plate to be perpendicularly movable, the post having a rack formed on one surface thereof to engage with the pinion and a locking groove formed on one side thereof; a stopper mounted on the base plate and selectively inserted into the locking grooves to secure the post at a lifted or lowered location; and a derrick height adjustment unit placed at one side of the base plate to align the locking grooves through height adjustment of the derrick.