- December 23, 2018
- Posted by: khawaja senan
- Category: Heavy Equipment
A fundamental aspect is to know the capacity of the bucket and the density of the material to work.
The buckets of the excavators are classified according to the capacity, rasa or crown, always in cubic meters (m³). The choice of the correct drawer depends on the weight of the excavator and the characteristics of the material to be loaded, explains the Link-Belt Customer Support Manager, Jorge Castro.
According to the executive, the selection process should begin with the loading capacity tables in the excavator. The density of the material to be worked by the excavator is a starting point for the definition of the capacity limit of the bucket. Material density tables can be easily acquired on the internet or at scientific sites.
There is a false idea that the larger the bucket the more volume of material will be removed, however, it must be remembered that the volume of excavated material depends directly on the loading cycles and that larger buckets significantly increase this loading time. Thus, the ideal is to find the optimum point between the volumes of the bucket in relation to the cycle time. An ideal charge cycle should be less than 12 seconds.
The payload of the bucket, that is, the actual amount of material in each excavation cycle depends on some factors such as the shape and design of the bucket, contact points with the soil and also the type of soil in question. These characteristics are called filling factors, which are basically the type of material agglomeration inside the bucket.
Some examples of filling factors (percentage of material capacity in the crowned ladle):
- Mud or Sandy Clay – 100-110%
- Sand and gravel – 95-110%
- Hard clay, resistant – 76-90%
- Rock – Well Exploited 60-75%
- Rock – Little Explosion 40-50%
Finally, looking for the useful life of the bucket, we will have the different configuration conditions, being the STDP, HDP and XDP bucket options. STDP buckets are suitable for general earthmoving applications without large concentrations of gravel or stone, recommended especially for light applications. The configuration of the HDP is a slightly more reinforced structure and is indicated for slightly more severe applications. But still within the limit of fill application.
Meanwhile, the XDP configuration is extremely resistant, for severe operations such as quarries and ore extraction. They have plates and protections between teeth, gaiters in the side knives and protections in the breast.
It might also interest you to read: The Advantages of Buying and Renting Used Heavy Equipment