The working principle of a groundnut sheller involves the removal of the outer shell or hull from the groundnut kernels. The primary goal is to separate the edible kernels from the non-edible hulls efficiently. Here is a step-by-step explanation of the working principle:
- Feeding Mechanism: The groundnuts are fed into the sheller through a hopper or a feeding chute. They can be manually loaded or fed automatically, depending on the type of sheller.
- Impact or Abrasion Method: Once inside the sheller, the groundnuts come into contact with a rotating rotor or a series of rotating discs. The rotor or discs are designed with specially shaped ridges, spikes, or rough surfaces.
- Impact or Abrasion Action: As the rotor or discs rotate, the groundnuts experience an impact or abrasive action against the ridges or rough surfaces. This action breaks or loosens the outer shell, separating it from the kernels.
- Shell and Kernel Separation: The broken or loosened shells are separated from the kernels using various mechanisms. This can involve the use of sieves, air blowers, or gravity separation methods. The aim is to allow the lighter shells to be expelled while the heavier kernels continue their path.
- Collection and Discharge: The shelled groundnut kernels are collected through outlets or chutes, which guide them into appropriate containers or further processing stages. The separated hulls are discharged separately or can be used for other purposes like animal feed or fuel.
- Cleaning and Sorting (Optional): In some advanced groundnut shellers, additional steps of cleaning and sorting may be included. This process helps remove any remaining debris, stones, or impurities from the shelled groundnuts, ensuring higher quality kernels.
The working principle may vary slightly depending on the type and design of the groundnut sheller, whether it is manual, motorized, or automatic. However, the fundamental concept remains the same: to remove the outer shell from the groundnut kernels efficiently and separate them for further processing or consumption.