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Open Access

ARTICLE

Structural Design and Control of the Intelligent Hook for Horizontal Rotating Flexible Lifting Straps

Mingliang Yang1, Yuyu Miao1,*, Xijun Xu2, Heng Yang1, Dong Qing1, Keyuan Zhao1
1 School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, China
2 Taiyuan Fortucky Logistics Equipment & Technology Co., Ltd., Taiyuan, China
* Corresponding Author: Yuyu Miao. Email: email

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.078754

Received 07 January 2026; Accepted 09 February 2026; Published online 11 March 2026

Abstract

The autonomous grasping of flexible slings is a pivotal challenge for unmanned crane systems, primarily stemming from the slings’ geometric indeterminacy, material compliance under load, and stochastic initial pose relative to the hook. To address this challenge, we propose an intelligent hook system featuring a novel compound mechanical architecture. This architecture integrates a horizontal slewing mechanism for in-plane alignment with a self-locking worm-gear drive for secure grasping. A coordinated control strategy, employing a Fuzzy PID algorithm, ensures robust dynamic performance under variable loading conditions. Finite element analysis confirms structural integrity under a rated load of 500 kg, with a maximum stress of 344.34 MPa. Experimental results demonstrate that the hook completes a full pick-and-release cycle in approximately 2 s for parallel slings, with a success rate exceeding 95%. This represents an approximately 60% improvement in operational efficiency over manual operation. This work provides a practical and efficient solution for automating flexible sling handling.

Keywords

Rotating mechanism; intelligent hook; mechanical structure; control system; fuzzy PID control; finite element analysis

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