1-.Classification of excavators
1.Common excavators are driven by internal combustion engines and electric driven excavators according to their driving methods.
2.According to different scales, excavators can be divided into large excavators, medium excavators and small excavators.
3.According to different ways of walking, excavators can be divided into crawler excavators and wheel excavators.
4.According to different transmission modes, excavators can be divided into hydraulic excavators and mechanical excavators. Mechanical excavators are mainly used in some large mines.
5.According to the purpose, excavators can be divided into different categories such as general excavators, mining excavators, marine excavators, and special excavators.
6.According to the bucket, the excavator can be divided into shovel excavator, backhoe excavator, dragline excavator and grab shovel excavator. Front shovel excavators are mostly used to excavate materials above the surface, and backhoe excavators are mostly used to excavate materials below the surface.
2.-THE ROLE OF EXCAVATORS
1. First of all, excavators can be used for construction activities at construction sites. For example, roads, Bridges, buildings, breeding pools, underground engineering, emergency excavation, etc., are inseparable from excavators.
2. Secondly, excavators are also needed on many occasions in rural areas, such as clearing land, building roads, digging reservoirs and ponds, etc., which are inseparable from excavators.
3. In addition to digging operations, excavators can also be used for loading operations. They can be used to load soil, sand and stones, etc

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