Weihua Electric hoist hook

The electric hoist hook consists of a hook body, a lock, a bearing or rotating mechanism, and a hook nut/pin. The hook body structure of the Weihua electric hoist hook is forged or rolled from high-strength alloy steel, which has high toughness and fatigue resistance.

What types of electric hoist hooks are there?

• Single hook (straight handle hook): simple structure, suitable for light loads.

• Double hook (S-shaped hook): symmetrical design, better balance, suitable for medium-sized loads.

• Swivel crane hooks: It can rotate 360° to reduce the torsion of the wire rope and is suitable for complex working conditions.

• Hook with safety lock: Equipped with a spring lock or latch to prevent unhooking (complying with safety standards).

Electric hoist hook parameters

Parameter category	Parameter description
Rated load	– Common range: 0.5 tons ~ 50 tons (needs to match the rated load of the electric hoist) – Safety factor: generally 4 to 6 times (for example, for a hook rated 1 ton, the ultimate breaking force needs to be 4 to 6 tons)
Materials and craftsmanship	– Material: Alloy steel (35CrMo, 20Mn2), stainless steel (304/316, used in corrosive environments) – Process: forging (high strength), rolling (economical)
Hook type	– Single hook (straight handle hook): light load (0.5~5 tons) – Double hook (S-shaped hook): medium load (5 to 20 tons) – Rotating hook: heavy load (10~50 tons)
Critical dimensions	– Hook mouth width (D): determines the size of the spreader that can be hung (such as 20mm ~ 200mm) – Hook body diameter (d): Positively related to load (for example, 1 ton hook d≈20mm) – Total height (H): affects the working space (usually 200mm ~ 800mm)
Rotate function	– Rotation angle: 360° free rotation – Rotation speed: ≤2r/min (with ball bearings or sliding bearings)
Safety device	– Crane hook safety latch types: spring lock, latch lock, flip lock – Lock opening and closing force: ≤10N (to avoid accidental opening)
Environmental adaptability	– Temperature range: -20℃～+200℃ (high temperature requires special heat treatment) – Anti-corrosion grade: ordinary (carbon steel), IP65 (dustproof and waterproof), stainless steel (acid and alkali resistant)

Safety instructions for using electric hoist hooks

1. Load limit:

   • Overloading is strictly prohibited and the load must not exceed the rated lifting capacity marked on the hook.

   • Avoid impact loads and lift slowly and steadily.

2. Daily inspection:

   • Cracks or deformation: Check the hook body and lock buckle for cracks, bends or wear before use.

   • Degree of wear: If the wear of the hook tip exceeds 10% of the original size, it needs to be replaced.

   • Rotational flexibility: The rotating hook should ensure smooth rotation without jamming.

3. Correct hanging:

   • The center of gravity of the load should be located at the center of the hook. It is prohibited to pull diagonally, pull sideways or tie it loosely.

   • When using a sling/rope, make sure it is fully embedded in the bottom of the hook to avoid getting caught on the hook tip.

4. Environmental adaptability:

   • High temperature and corrosive environments require the use of special materials (such as stainless steel hooks).

   • Avoid use near live lines to prevent risk of electric shock.

How to maintain hoist hook?

1. Cleaning and Lubrication:

   • Clean dust and oil regularly to prevent impurities from exacerbating wear and tear.

   • The rotating parts need to be filled with high temperature resistant grease to maintain flexibility.

2. Anti-corrosion treatment:

   • In humid or corrosive environments, apply anti-rust oil or galvanize.

3. Regular testing:

   • Conduct magnetic particle inspection or ultrasonic inspection every 6 months to check for internal defects.

   • Check whether connecting parts (such as pins, nuts) are loose or deformed.

4. Replacement standards:

   • When cracks, permanent deformation, or the hook mouth expands by more than 15%, it must be replaced immediately.

   • The lock fails or the spring loses its elasticity and needs to be repaired or replaced.

FAQ

Q: The hook is not flexible in rotation.

A: Check whether the bearing is short of oil or foreign matter has entered, and lubricate it after cleaning.

Q: Lock cannot be closed.

A: Check whether the spring is damaged or the locking mechanism is deformed.

Q: Rust on hook body surface.

A: Mild rust can be polished with sandpaper and then coated with anti-rust oil; severe rust requires replacement.

Q: How to understand the “safety factor 4 times” of the hook?

A: The breaking strength of the hook needs to be more than 4 times the rated load (for example, a 1-ton hook needs to withstand 4 tons of pulling force without damage).

Q: How to judge whether the hook needs to be replaced?

A: Deformation of the hook mouth leads to an increase in width of ≥15%;

Surface crack depth ≥1mm;

The hook tip wear exceeds 10% of the original thickness.

Q: How long is the bearing life of a swivel hook?

A: It lasts about 5,000 hours under normal working conditions and requires lubrication and maintenance every 3 months.