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Direct cause :

• The lifting equipment (such as wire rope, chain) is broken or deformed.

• The hook opening is too large (if it exceeds the rated value by 15%, it must be scrapped).

• Accidental release of the load (safety locking device not in use).

• External force collision or operational error (such as oblique lifting).

Potential factors :

• Material fatigue, corrosion or manufacturing defects.

• Overload or shock load.

Spring tongue anti-unhooking device

• The hook opening is automatically closed by spring force and needs to be manually unlocked before mounting.

• Improvement directions : corrosion-resistant spring materials (such as stainless steel) and dust-proof design.

Rotating card lock

• The card plate rotates to cover the opening through gravity or mechanical linkage, and the locking reliability is high.

• Example : European standards (EN 13889) mandate that hooks be equipped with a locking mechanism.

Real-time load monitoring

• Install a weighing sensor on the hook or wire rope to automatically cut off the operation when overloaded.

Opening degree detection

• Use laser ranging or Hall sensor to monitor hook opening deformation and alarm when exceeding limit.

Visual recognition system

• Camera + AI algorithm detects the status of the spreader (such as wire rope breakage and load tilt).

High strength and toughness materials

• Alloy steel (such as 34CrMo4) is used and quenched and tempered to improve impact resistance.

Redundant design

• The double hook parallel structure can still bear the load even if a single point fails.

Automatic lock reminder

• Whether the hook is locked is detected by RFID or pressure sensor, and lifting is prohibited if it is not locked.

Anti-sway coordinated control

• Combined with the anti-sway system (see above) the risk of unhooking due to dynamic load shock is reduced.

Self-repairing coating technology

• Apply a wear-resistant/anti-corrosion coating on the hook surface, and the cracks can heal automatically (such as microcapsule repair agent).

Digital Twin Early Warning

• Based on the hook stress simulation model, fatigue life can be predicted and replacement can be carried out in advance.

Magnetic assisted latching

• The electromagnet is forced to lock when the power is off to prevent unhooking due to sudden power failure.

International Standards :

• ISO 17096 : Safety requirements for crane hook locking devices.

• ASME B30.10 : Inspection and rejection standard for lifting hooks.

Test method :

• Fatigue test : simulate 100,000 opening and closing cycles to verify reliability.

• Impact test : Free fall test the impact resistance of the locking device.

Port cranes : With triple protection (mechanical locking + overload alarm + visual monitoring), the unhooking accident rate is reduced by 90%.

Nuclear power hoisting : Use titanium alloy anti-unhooking hoisting equipment , which is radiation-resistant and has a lifespan extended by 50%.

Direct cause :

• The lifting equipment (such as wire rope, chain) is broken or deformed.

• The hook opening is too large (if it exceeds the rated value by 15%, it must be scrapped).

• Accidental release of the load (safety locking device not in use).

• External force collision or operational error (such as oblique lifting).

Potential factors :

• Material fatigue, corrosion or manufacturing defects.

• Overload or shock load.

Spring tongue anti-unhooking device

• The hook opening is automatically closed by spring force and needs to be manually unlocked before mounting.

• Improvement directions : corrosion-resistant spring materials (such as stainless steel) and dust-proof design.

Rotating card lock

• The card plate rotates to cover the opening through gravity or mechanical linkage, and the locking reliability is high.

• Example : European standards (EN 13889) mandate that hooks be equipped with a locking mechanism.

Real-time load monitoring

• Install a weighing sensor on the hook or wire rope to automatically cut off the operation when overloaded.

Opening degree detection

• Use laser ranging or Hall sensor to monitor hook opening deformation and alarm when exceeding limit.

Visual recognition system

• Camera + AI algorithm detects the status of the spreader (such as wire rope breakage and load tilt).

High strength and toughness materials

• Alloy steel (such as 34CrMo4) is used and quenched and tempered to improve impact resistance.

Redundant design

• The double hook parallel structure can still bear the load even if a single point fails.

Automatic lock reminder

• Whether the hook is locked is detected by RFID or pressure sensor, and lifting is prohibited if it is not locked.

Anti-sway coordinated control

• Combined with the anti-sway system (see above) the risk of unhooking due to dynamic load shock is reduced.

Self-repairing coating technology

• Apply a wear-resistant/anti-corrosion coating on the hook surface, and the cracks can heal automatically (such as microcapsule repair agent).

Digital Twin Early Warning

• Based on the hook stress simulation model, fatigue life can be predicted and replacement can be carried out in advance.

Magnetic assisted latching

• The electromagnet is forced to lock when the power is off to prevent unhooking due to sudden power failure.

International Standards :

• ISO 17096 : Safety requirements for crane hook locking devices.

• ASME B30.10 : Inspection and rejection standard for lifting hooks.

Test method :

• Fatigue test : simulate 100,000 opening and closing cycles to verify reliability.

• Impact test : Free fall test the impact resistance of the locking device.

Port cranes : With triple protection (mechanical locking + overload alarm + visual monitoring), the unhooking accident rate is reduced by 90%.

Nuclear power hoisting : Use titanium alloy anti-unhooking hoisting equipment , which is radiation-resistant and has a lifespan extended by 50%.