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　　Semi-closed hook group is a common load-bearing device in lifting operations, and its operating stability directly affects the safety of the operation. If a fall accident occurs, the cause needs to be systematically checked from three aspects: equipment status, operating specifications and maintenance management, and targeted improvement measures should be taken.

　　1. Analysis of common fall causes

　　Mechanical structure failure

　　Hook body cracks or fractures are the primary risk points. Long-term overload use will cause metal fatigue, while casting defects or failure to meet welding processes will reduce structural strength. The wear of bearings and pulley components is as critical. Inadequate lubrication or foreign matter intrusion can accelerate component loss, resulting in inflexible rotation or even stuck.

　　Loss of operating specifications

　　Illegal overloading is an operational problem that is easily overlooked. In order to improve work efficiency, some workers ignore the rated load limit, resulting in a breakthrough in safety factor. Cable-pull hard pulling occurs frequently in space-constrained scenarios. This non-vertical stress state will greatly increase lateral stress and accelerate equipment loss.

　　Maintenance management vulnerabilities

　　Formal inspection process leads to accumulation of hidden dangers. Some maintenance records are only marked "normal" and no specific detection data is recorded, such as key parameters such as bearing clearance and hook body deformation. The lubrication cycle is not strictly performed, and it is still maintained in normal cycles in environments with large dust, which accelerates the wear process.

　　2. Systematic solutions

　　Equipment upgrade and transformation

　　Use magnetic powder flaw detection technology to regularly detect internal defects of the hook body and establish a metal fatigue database to predict the replacement cycle. Install load monitoring sensors in key areas and feedback the working status to the control center in real time. For high-temperature operating environments, heat-resistant alloy materials can be used and heat-insulating protective layers can be added.

　　Operation specification optimization

　　Develop a hierarchical load management system and mark the allowable loads under different working conditions in obvious locations. Carry out three-dimensional simulation training to demonstrate dangerous scenarios of cable-stayed operations through virtual reality technology. Establish a pre-operation inspection list system, and list the hook-end closed state, anti-detachment device, etc. as necessary inspection items.

　　Improving the maintenance system

　　Implementing the "three-color management" maintenance method: the green area is a normal part, the yellow area is the part that needs to be observed, and the red area is the part that must be replaced. Establish a lubricant consumption ledger and adjust the oil replenishment cycle according to actual working conditions. When operating in dust environments, install an automatic purge device to keep the pulley set clean.

　　3. Construction of long-term management mechanism

　　Create equipment health records and record each operation parameters, maintenance records and abnormal situations. Implement quarterly safety assessments and set differentiated maintenance plans based on the equipment use year restrictions. Carry out cross-post safety cooperation, cranes and repair workersRegularly exchange experiences and improve emergency response plans.

　　Through the three-dimensional linkage of technology upgrades, process optimization and management innovation, the risk of using semi-closed hook groups can be reduced. The key is to transform passive maintenance into active prevention, build a safety management system covering the entire cycle of design, use and maintenance, and effectively ensure the safety of operators and equipment.

　　Semi-closed hook group is a common load-bearing device in lifting operations, and its operating stability directly affects the safety of the operation. If a fall accident occurs, the cause needs to be systematically checked from three aspects: equipment status, operating specifications and maintenance management, and targeted improvement measures should be taken.

　　1. Analysis of common fall causes

　　Mechanical structure failure

　　Hook body cracks or fractures are the primary risk points. Long-term overload use will cause metal fatigue, while casting defects or failure to meet welding processes will reduce structural strength. The wear of bearings and pulley components is as critical. Inadequate lubrication or foreign matter intrusion can accelerate component loss, resulting in inflexible rotation or even stuck.

　　Loss of operating specifications

　　Illegal overloading is an operational problem that is easily overlooked. In order to improve work efficiency, some workers ignore the rated load limit, resulting in a breakthrough in safety factor. Cable-pull hard pulling occurs frequently in space-constrained scenarios. This non-vertical stress state will greatly increase lateral stress and accelerate equipment loss.

　　Maintenance management vulnerabilities

　　Formal inspection process leads to accumulation of hidden dangers. Some maintenance records are only marked "normal" and no specific detection data is recorded, such as key parameters such as bearing clearance and hook body deformation. The lubrication cycle is not strictly performed, and it is still maintained in normal cycles in environments with large dust, which accelerates the wear process.

　　2. Systematic solutions

　　Equipment upgrade and transformation

　　Use magnetic powder flaw detection technology to regularly detect internal defects of the hook body and establish a metal fatigue database to predict the replacement cycle. Install load monitoring sensors in key areas and feedback the working status to the control center in real time. For high-temperature operating environments, heat-resistant alloy materials can be used and heat-insulating protective layers can be added.

　　Operation specification optimization

　　Develop a hierarchical load management system and mark the allowable loads under different working conditions in obvious locations. Carry out three-dimensional simulation training to demonstrate dangerous scenarios of cable-stayed operations through virtual reality technology. Establish a pre-operation inspection list system, and list the hook-end closed state, anti-detachment device, etc. as necessary inspection items.

　　Improving the maintenance system

　　Implementing the "three-color management" maintenance method: the green area is a normal part, the yellow area is the part that needs to be observed, and the red area is the part that must be replaced. Establish a lubricant consumption ledger and adjust the oil replenishment cycle according to actual working conditions. When operating in dust environments, install an automatic purge device to keep the pulley set clean.

　　3. Construction of long-term management mechanism

　　Create equipment health records and record each operation parameters, maintenance records and abnormal situations. Implement quarterly safety assessments and set differentiated maintenance plans based on the equipment use year restrictions. Carry out cross-post safety cooperation, cranes and repair workersRegularly exchange experiences and improve emergency response plans.

　　Through the three-dimensional linkage of technology upgrades, process optimization and management innovation, the risk of using semi-closed hook groups can be reduced. The key is to transform passive maintenance into active prevention, build a safety management system covering the entire cycle of design, use and maintenance, and effectively ensure the safety of operators and equipment.