US 12,358,761 B2
Cargo crane, cargo-crane swing prevention method, and cargo conveyance method
Yuki Takaki, Tokyo (JP); Yusuke Yoshinari, Tokyo (JP); and Osamu Yamaguchi, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/010,136
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed May 14, 2021, PCT No. PCT/JP2021/018337
§ 371(c)(1), (2) Date Dec. 13, 2022,
PCT Pub. No. WO2021/261108, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-106741 (JP), filed on Jun. 22, 2020.
Prior Publication US 2023/0234812 A1, Jul. 27, 2023
Int. Cl. B66C 13/48 (2006.01); B66C 13/22 (2006.01)
CPC B66C 13/22 (2013.01) [B66C 13/48 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A cargo crane configured to convey a suspended cargo from an arbitrary cargo start position to a cargo target position by a turning motion of a crane arm, the suspended cargo being suspended by a wire provided to an arm distal end portion of the crane arm, the cargo crane comprising:
an arm turning mechanism configured to turn the crane arm;
an arm luffing mechanism configured to adjust a luffing angle of the crane arm;
an arm extension and contraction mechanism configured to adjust an arm length of the crane arm; and
a control device configured to calculate a trajectory in which the suspended cargo is conveyed, and configured to control the arm turning mechanism, the arm luffing mechanism, and the arm extension and contraction mechanism,
wherein the control device is configured to:
calculate the trajectory to be a straight line trajectory as viewed from at least a vertical direction, according to the cargo start position and the cargo target position;
using the cargo start position, the cargo target position, a maximum speed, a suspended cargo swing cycle, and a start-up time, calculate a turning angle of the crane arm, the luffing angle, and the arm length to cause the trajectory to be the straight line trajectory; and
control the arm turning mechanism, the arm luffing mechanism, and the arm extension and contraction mechanism to achieve the turning angle, the luffing angle, and the arm length calculated.