Bucket teeth are an important part of an excavator and also a vulnerable part. It is a combined bucket tooth composed of a tooth seat and a tooth tip, which are connected by a pin shaft. Because the part of the bucket tooth wear and tear is the tooth tip, just replace the tip. Failure form
Bucket teeth receive different degrees of wear under different working conditions and environments, and different degrees of impact will cause different damage. Bucket teeth can only be used for three days under normal working conditions, which does not meet the requirements in terms of economics or use.
Failure analysis
1. Analyze from the aspect of force
The force area of the bucket tooth is in contact with the object to be excavated, and the force is different at different working stages in a complete excavation process. When the tip of the tooth first touches the surface of the material, the tip of the bucket receives a stronger impact due to the faster speed. If the yield strength of the tooth is low, plastic deformation will occur at the tip. As the digging depth increases, the force of the bucket teeth will change.
2. From the work situation analysis
When the bucket tooth cuts the material, the bucket tooth and the material move relative to each other, and a large positive squeezing force is generated on the surface, thereby generating a large frictional force between the force area of the bucket tooth and the material. If the material is hard rock, concrete, etc., the friction force will be great. Under the action of the repeated process, different degrees of surface wear are produced on the bucket tooth working surface, which in turn produces a deep furrow.
From the analysis, it can be judged that positive pressure and friction are the main external mechanical factors of bucket tooth failure, which play a major role in the process of failure.