The present invention relates to a swing apparatus for compensating for ships neokkeul cranes, the main body 10 for supporting a crane and; And the main body supporting part 20 for rotatably supporting (10); And the main jib (30) pivotably mounted to the body 10; Neokkeul and jib 40, which is located at the end of the main jib (30); And a link portion 50 for connecting the main jib 30 and the jib neokkeul 40; The main jib 30 and the jib neokkeul 40 control the main cylinder 35 and the cylinder neokkeul 45 for each of the angle and; And winches (15) provided in the body (10); Wherein the one end is fixed to the winch (15), the other end is via a main jib 30 and the jib neokkeul 40. The wire rope 60 is installed so that the free end downwardly and cast; And in marine cranes, including a hook 70, which is installed on the free end of the wire rope 60, a number of fixed pulleys (R1) that is installed on the main jib 30 and the jib neokkeul 40; And moving the pulley (R2) is provided between the winch 15 and the fixed pulley or between (R1) and the fixed pulley (R1) of the fixed pulley (R1) to adjust the length of the wire rope (60); That is attached to the vertical oscillation of the vessel detected by the vessel in waves and measures the shaking motion amount MRU (80) and; And the MRU (80), the wire rope length adjustment device (90) for transferring the moving pulley (R2) in accordance with the measured values ​​of the; And the shock absorber 100 to absorb the change in length of the wire rope 60, to which the wire rope is linked to the length adjuster (90) generated in accordance with the up and down swing of the ship due to waves; The MRU control unit 110 through the measured value by 80, controls the operation of the wire rope length adjustment device 90 and calculating a compensation value of the wire rope 60, whereby the; Detecting the actual travel distance of the moving pulley (R2) being conveyed by the wire rope length adjustment device 90, and comprises a distance correction unit 120 to correct the error between the distance that must be moved and the actual travel distance The technical features.
Thereby, even if the ship is rocking up and down by the waves it can be maintained intact without swinging the height of the hook is installed on the wire rope end by the wire rope length adjustment device for transferring the movement of pulleys it is possible to accurately control the position of the hook when working, more precise and easy to work by a marine vessel is to be able to perform.