DRAGGING PREVENTION DEVICE FOR SHIP ANCHOR CABLE IN SPRING RANGE ENVIRONMENT, AND DRAGGING PREVENTION METHOD THEREFOR

A dragging prevention device for a ship anchor cable in a spring range environment, and a dragging prevention method therefor. The dragging prevention device comprises a base plate (1), wherein a chain wheel support (2) is welded above a front side of the base plate (1), a chain cable fairlead (3) for guiding an anchor chain is adapted to a front end of the chain wheel support (2), a mooring cable angle monitoring assembly is provided below the front side of the base plate (1), and the mooring cable angle monitoring assembly comprises a first bracket (701), a second bracket (702) and a chain guide cylinder seat (703). A deflection angle of a rotating shaft A connected between the second bracket (702) and the first bracket (701) is monitored by a first angle encoder (7021), and a deflection angle of a rotating shaft B connected between the second bracket (702) and the guide chain cylinder seat (703) is monitored by a second angle encoder (7031), such that the deflection angles of the anchor chain (4) in two di