US 12,227,399 B2
Control of chain hoist
Mikko Porma, Hyvinkää (FI); Tomi Heinonen, Hyvinkää (FI); and Ari Väisänen, Hyvinkää (FI)
Assigned to Konecranes Global Corporation, Hyvinkää (FI)
Appl. No. 18/561,187
Filed by Konecranes Global Corporation, Hyvinkää (FI)
PCT Filed May 16, 2022, PCT No. PCT/FI2022/050326
§ 371(c)(1), (2) Date Nov. 15, 2023,
PCT Pub. No. WO2022/243600, PCT Pub. Date Nov. 24, 2022.
Claims priority of application No. 20215576 (FI), filed on May 17, 2021.
Prior Publication US 2024/0253956 A1, Aug. 1, 2024
Int. Cl. B66D 1/48 (2006.01); B66D 3/26 (2006.01)
CPC B66D 1/485 (2013.01) [B66D 3/26 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An apparatus which comprises:
means for measuring a signal which describes a force caused by the load to the chain;
means for performing high-pass filtering to the signal and for determining a maximum and minimum force affecting the chain of the chain hoist during a vibration period, and determining the start of resonance based on the maximum and the minimum;
means for detecting the start of resonance when a load is moved by a chain hoist;
means for determining a new speed for the rotation of a chain wheel of the chain hoist such that resonance is avoided, wherein the new speed is determined by adding a correction term to a speed instruction, and the speed instruction determines a speed on which the chain wheel is rotated by means of a motor; and
means for controlling the chain hoist to use the new speed.