For the fixing method of the hook screws of the chain crane, it is necessary to ensure that the screws can firmly connect the hook and the crane to withstand the weight and vibration during the lifting process. Here are some key steps and precautions:

1、 Preparation work

Cleaning: Firstly, ensure that the contact surface between the hook and screw is clean and free of oil stains or impurities, which helps to increase friction and improve the stability of the connection.

Inspection: Check whether the screws are damaged or worn, especially the threaded parts, to ensure that they are in good condition.

2、 Choose the appropriate screws

Specification matching: Select screw specifications that match the hook and crane, including diameter, length, and thread type.

Material: Select appropriate materials based on the usage environment and requirements, such as stainless steel, alloy steel, etc., to ensure that the screws have sufficient strength and corrosion resistance.

3、 Fixed method

Pre tightening: Use a suitable tool (such as a wrench or torque wrench) to pre tighten the screw to the appropriate level. The magnitude of the preload force should be determined according to the specifications and lifting requirements of the crane.

Locking: To prevent screws from loosening during vibration or prolonged use, locking devices or locking agents can be used to secure the screws. Common locking methods include using locking washers, locking nuts, or applying screw locking agents.

Lock washers: such as spiral washers or flange washers, which prevent screws from loosening by increasing friction or mechanical locking.

Lock nut: such as nylon lock nut or self-locking nut, they have a special structure or material that can automatically lock after tightening.

Screw locking agent: Apply an appropriate amount of screw locking agent on the thread. After it solidifies, a strong bond will be formed between the screw and nut to prevent loosening.

4、 Inspection and testing

Tightening inspection: After fixing the screws, use tools such as torque wrenches to check if the tightening degree meets the requirements.

Functional testing: Conduct a lifting test to observe whether the hook and screws are stable and reliable during the lifting process, without looseness or abnormal phenomena.

5、 Precautions

Compliance with regulations: When fixing screws, the crane's user manual and relevant safety regulations should be strictly followed.

Regular maintenance: Regularly check the fastening status and wear of screws, and replace them in a timely manner if necessary.

Avoid overload: Ensure that the lifting weight does not exceed the rated bearing capacity of the crane to prevent screws from loosening or being damaged due to overload.

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