Multi-rope lifting system and method

Abstract

The invention relates to the field of harbor machinery and discloses a multi-rope lifting system and method. The multi-rope lifting system comprises a lifting appliance, N lifting ropes used for lifting the lifting appliance, N roller control mechanisms in one-to-one correspondence with the N lifting ropes, and a controller electrically connected with the N roller control mechanisms. The controller sends rope take-up position control signals to the N roller control mechanisms, also detects the torque of the roller control mechanisms and judges whether the phenomenon that the unloaded lifting appliance controlled by the N lifting ropes is not horizontal exists or not according to the detected torque of the roller control mechanisms. If the phenomenon that the unloaded lifting appliance is not horizontal exists, the unloaded lifting appliance is adjusted to be in the horizontal direction by controlling the roller control mechanisms. By the adoption of the system and method, movement in six degrees of freedom can be achieved, the situation that the lifting appliance is not horizontal and overweighted can also be avoided, and accordingly the safety coefficient in the lifting process is increased, and the accident probability is lowered.

Description

technical field [0001] The invention relates to the field of port machinery, in particular to a multi-rope lifting system and a method thereof. Background technique [0002] With the development of the economy and the increase of port throughput, the efficiency and safety of crane loading and unloading containers have been paid more and more attention by people. [0003] At present, multiple lifting ropes on a crane are generally controlled by the same roller. Although this method saves costs, it cannot realize that the spreader can move in six degrees of freedom. The reason, the position of the fixed goods or the reason of wear and tear, the container lifted by the spreader is unevenly stressed, which leads to uneven lifting of the container and non-level phenomenon. If the container is not horizontal or overweight, the container will easily fall off when the crane is loading and unloading the container, which will easily injure the on-site personnel and facilities, causin...

AI Technical Summary

Problems solved by technology

[0003] At present, multiple lifting ropes on a crane are generally controlled by the same roller. Although this method saves costs, it cannot realize that the spreader can move in six degrees of freedom. The reason, the position of the fixed goods or the reason of wear and tear, the container lifted by the spreader is unevenly stressed, resulting in uneven lifting of the container and non-level phenomena

If the container is not horizontal or overweight, the container will easily fall off when the crane is loading and unloading the container, which will easily injure the on-site personnel and facilities, causing unnecessary economic losses

Moreover, overweight containers may damage the equipment and reduce the service life of the equipment

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