1. Why is it prohibited to directly lift steel coils using ordinary steel wire ropes or forklifts?
A: There are several fatal flaws:
Surface Damage: When ordinary steel wire ropes come into contact with the surface of the steel coil, they generate high pressure from a point to a surface, easily leaving scratches and indentations. Direct use of forklifts (such as lifts) or other non-specialized tools is strictly prohibited, as it will cause serious damage.
Safety Hazards: The contact point between the forklift teeth and the curved surface of the steel coil is extremely small and unstable. Studies have shown that a 1.5-meter diameter cold-rolled steel coil tilted at a 5° angle will generate a lateral rolling force exceeding 3 tons.
2. What specialized lifting tools should be used for loading and unloading cold-rolled coils? What are their advantages?
A: Using specialized lifting tools is fundamental to avoiding damage. Here are some mainstream options and their characteristics:
Lifting Tool Type | Core Advantages | Key Precautions
Specialized Synthetic Fiber Slings | Soft material, forming a "flexible contact surface" with the steel coil, causing almost no surface damage. | Must be used with corner protectors/sheaths to prevent the sharp edges of the steel coil from cutting the sling.
C-Type Hooks | Sturdy and durable structure, single hook can bear up to 50 tons, suitable for heavy-duty steel coils. | The contact surface needs to be lined with a soft material (such as copper, aluminum, or polyurethane) to prevent the hook from directly contacting the steel coil and scratching the surface.
3. What are the key protective details when using slings for lifting?
A: Details matter. The following points must be considered when using slings:
Equip corner protectors/sleeves: Sleeves must be installed at the points where the sling contacts the edges (corners) of the steel coil. This prevents the sling from being cut and also avoids the sling itself causing damage to the steel coil.
Choose high-quality slings: Use cut-resistant polyester slings with a removable fabric protective sleeve, or wire rope slings with a polyurethane coating to form a reliable protective layer.
Control sling length: Excessively long slings increase the swaying amplitude during steel coil lifting. Practice shows that appropriately shortening the sling length (e.g., from 6 meters to 4 meters) can effectively improve the stability of the steel coil during lifting.
4. How to prevent steel coils from rolling and colliding during handling and vehicle transportation?
A: Securement during handling and transportation is crucial. Key measures include:
Handling process: Use ropes or other auxiliary protective measures during hoisting to prevent the steel coils from rolling or colliding. When using forklifts, ensure the forks are fully inserted into the coil core (depth ≥ 80%); single-tooth operation is strictly prohibited.
Vehicle loading: The transport vehicle must be cleaned and lined with wooden blocks and rubber mats to provide a stable and intact loading environment for the steel coils. For long-distance transportation such as by sea, specialized securing devices and corner protectors are required for reinforcement to prevent the steel coils from shifting or colliding due to bumps during transport.
5. Besides tools, what other management systems can effectively reduce damage?
A: Systems and culture are key to ensuring standardized operations:
Develop and implement standard operating procedures: Companies must develop specific lifting operation standards for cold-rolled coil loading and unloading and ensure strict adherence.
Strengthen personnel training: Operators need professional training to understand the easily damaged characteristics of cold-rolled coils and master standard operating procedures. For example, training should emphasize key points such as holding the steering wheel firmly with both hands and keeping the line of sight level with the top of the coil to anticipate changes in the center of gravity.
Regular inspection and maintenance: Establish a regular inspection and maintenance system for all lifting slings to ensure they are always in good condition and avoid safety accidents caused by wear or defects in the lifting equipment itself.