The reasons for the fracture of the intermediate shaft of the electric wire rope hoist can be attributed to multiple aspects, including manufacturing process, design strength, load management during use, maintenance, and environmental factors. The following is a specific analysis of these reasons:

1、 Manufacturing process issues

Inadequate process flow: In the manufacturing process of the shaft, if the process flow is not rigorous or there are omissions, such as heat treatment, forging, processing, etc., which do not meet the standard requirements, it may lead to internal defects of the shaft, such as cracks, inclusions, etc., which are prone to fracture during use.

Improper material selection: The material selection of the intermediate shaft is crucial for its strength and durability. If the selected materials do not meet the design requirements or have quality problems, such as insufficient strength, poor toughness, etc., it will increase the risk of fracture.

2、 Insufficient design strength

Inaccurate load calculation: In the design of electric wire rope hoists, if the actual working load is not accurately calculated or insufficient safety factors are considered, it may cause the intermediate shaft to break when bearing the load during normal operation.

Unreasonable structural design: The structural design of the intermediate shaft should take into account its stress characteristics and working environment. If the structural design is unreasonable, such as the cross-sectional size being too small or the shape being unreasonable, it will lead to insufficient strength of the shaft and easy fracture.

3、 Problems during use

Overload use: If the electric wire rope hoist is used beyond its rated load range, it will cause excessive pressure on the intermediate shaft, leading to its fracture. Especially in long-term and continuous overloaded operations, such problems are more likely to occur.

Long usage time: With the increase of usage time, the intermediate shaft will be affected by wear and fatigue, and its strength and durability will gradually decrease. If not replaced or repaired in a timely manner, it may cause it to break during use.

4、 Improper maintenance and upkeep

Lack of lubrication: The intermediate shaft needs sufficient lubrication during operation to reduce wear and friction. If there is a lack of lubrication or poor lubrication, it will lead to increased surface wear of the shaft, thereby reducing its strength and durability.

Failure to inspect and repair in a timely manner: Regular inspection and maintenance are the key to ensuring the normal operation of electric wire rope hoists. If cracks, wear, and other issues of the intermediate shaft are not detected and dealt with in a timely manner, it may lead to its fracture during use.

5、 Environmental factors

Corrosion: When working in humid and highly corrosive environments, the intermediate shaft is easily affected by corrosion. Corrosion can cause defects such as pits and cracks on the surface of the shaft, thereby reducing its strength and durability.

Temperature changes: Temperature changes can also have an impact on the performance of the intermediate shaft. When working in high or low temperature environments, the material properties of the shaft may change, such as decreased strength and decreased toughness, thereby increasing the risk of fracture.

In summary, the reasons for the fracture of the intermediate shaft of the electric wire rope hoist are multifaceted, and comprehensive analysis and prevention are needed from multiple aspects such as manufacturing process, design strength, load management during use, maintenance, and environmental factors. To reduce the risk of fracture, the following measures can be taken:

Strengthen quality control of manufacturing processes to ensure that each process step meets standard requirements.

Accurately calculate and design the load capacity and structural dimensions of the intermediate shaft to ensure that it meets work requirements.

Strictly follow the user manual to operate the electric wire rope hoist and avoid overloading.

Regularly inspect and maintain the intermediate shaft, promptly identify and address any issues.

Improve working environment conditions, reduce the impact of corrosion and temperature changes on the intermediate shaft.

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