Design of swing device for crown-block heave compensation system

A swing device mathematical model was established by the Simulink software system in order to determine the structure parameters of crown-block heave compensation device's key components. The crown-block, compensating cylinder and rocker arm device were simulated dynamically. The interrelation between the inclined angle of wire line, the force on the crown-block affected by wire line and the crown-block displacement was analyzed. The relationship between the angle of two rocker arm and the force state of compensating cylinder was also investigated. The study shows that the structure parameters, such as the length of the rocker arm device, the fixed hinge point position of the rocker arm device and so on, have large effects on the crown-block's motion rule, force state and compensating property. The force of compensating cylinder first decreases and then increases along with the angle of two rocker arm increases when the crown-block moves from the lowest position to highest position. The length of the rocker arm device was calculated, and the fixed hinge point position of the rocker arm device and the fixed hinge point position of the compensating cylinder were determined.