The stainless steel lever hook (i.e. stainless steel hook) is a key component in lifting operations, and its common fault analysis and improvement suggestions are as follows:

1、 Common Fault Analysis

Fracture failure

Reasons: Overloading, expired use, material defects, improper heat treatment, stress concentration caused by machining tool marks, hydrogen embrittlement, etc. For example, when the hook is subjected to a large load, if there are defects in the material or improper heat treatment, it may lead to insufficient toughness and fracture. In addition, the knife marks left during the processing may become stress concentration points, causing crack propagation and ultimately leading to fracture. Hydrogen embrittlement is caused by the excessive absorption of hydrogen by the hook during manufacturing or use, resulting in increased material brittleness and susceptibility to fracture.

Performance: When the hook breaks, the fracture surface may appear flat and without obvious plastic deformation, and visible radial edges can be observed macroscopically. Microscopic fracture surfaces may exhibit cleavage and transgranular features, with tearing edges appearing on both cleavage and transgranular planes.

wear

Reason: Long term use, fatigue, friction, etc. During frequent lifting of heavy objects, friction between the hook and components such as steel wire ropes can cause surface wear. In addition, if the hook design is unreasonable or used improperly, it may also accelerate the wear process.

Performance: The opening of the hook and the wear of the dangerous section weaken the strength, which can easily cause deformation or breakage of the hook. When the wear is severe, the load-bearing capacity of the hook will significantly decrease, posing a safety hazard.

plastic deformation

Reason: Long term overload and fatigue. If the hook is subjected to heavy objects exceeding its rated load for a long time, or if frequent lifting operations are carried out, it may cause plastic deformation of the hook.

Performance: Plastic deformation occurs at the opening and bending parts, affecting the normal use of the hook. The hook after plastic deformation may not be able to maintain its original shape and size, resulting in the inability to fit properly with components such as steel wire ropes.

Rotation issue

Reason: During the lifting process, external forces such as manpower or wind force push the hook to rotate, the driver's unstable operation causes the hook and heavy object to swing, and the way the hook is wound causes the hook to be unbalanced.

Performance: After the hook rotates, the steel wire rope wrapped between the hook and the top pulley of the boom twists together, and the lifted object also rotates with the hook. This not only affects the normal operation of lifting operations, but may also pose a threat to the safety of workers and equipment.

2、 Improvement suggestions

Improvement suggestions for fracture failure

Select high-quality materials: Ensure that the hook material has good fatigue performance and resistance to brittle fracture. For example, materials with good toughness such as low-carbon steel or low-alloy steel can be selected to manufacture the hook.

Optimize heat treatment process: Improve the toughness and strength of the hook through a reasonable heat treatment process. For example, heat treatment processes such as quenching and tempering can be used to improve the microstructure and properties of the hook.

Improve processing technology: Avoid leaving stress concentration points such as machining tool marks on the surface of the hook. During the processing, the machining accuracy and surface quality should be strictly controlled to ensure a smooth and even surface of the hook.

Prevent hydrogen embrittlement: Take measures during manufacturing and use to prevent the hook from absorbing hydrogen. For example, during welding or heat treatment, the atmosphere and temperature conditions should be strictly controlled to avoid the invasion of hydrogen.

Improvement suggestions for wear and tear

Regular inspection and maintenance: Regularly inspect and maintain the hook to promptly identify and address wear and tear issues. For example, key parameters such as the opening size and dangerous section size of the hook can be regularly checked to ensure that they are within a safe range.

Choose wear-resistant materials: Use materials with good wear resistance when manufacturing hooks. For example, high-strength wear-resistant steel and other materials can be used to improve the wear resistance of the hook.

Optimization design: Reduce wear by optimizing the design of the hook. For example, design parameters such as the shape and size of the hook mouth of the hook can be improved to make its fit with components such as steel wire ropes more reasonable, reducing friction and wear.

Improvement suggestions for plastic deformation

Strictly control the load: ensure that the hook is used within the rated load range, avoid long-term overload or frequent lifting of heavy objects. During use, the lifting operation should be strictly carried out according to the rated load of the hook, and overloading is not allowed.

Strengthen inspection and maintenance: Regularly inspect and maintain the hooks to promptly detect and address plastic deformation issues. For example, the deformation of key parts such as the opening and bending of the hook can be regularly checked to ensure that no plastic deformation has occurred.

Improvement suggestions for rotation issues

Optimize the threading method: Reduce the possibility of hook rotation by optimizing the threading method of the steel wire rope. For example, even numbered steel wire ropes can be used for threading, and the pulley at the top of the boom and the pulley on the hook should not be too far apart as possible.

Use anti rotation device: Install an anti rotation device on the hook to prevent it from rotating. For example, anti decoupling safety devices or locking devices can be installed on the hook to prevent the hook from rotating during lifting.

Improve operational skills: Strengthen training and education for drivers to enhance their operational skills and safety awareness. Require the driver to maintain smooth lifting and rotating movements of the hook during operation, avoiding multiple movements simultaneously causing the hook to rotate.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment