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Gravity Destoner: A Comprehensive Guide

Jul. 05, 2023

A wheat/maize gravity destoner, also known as a gravity separator or a specific type of destoner, is a machine used to remove heavy impurities, such as stones, from grains and seeds. It operates on the principle of density difference, utilizing gravity and airflow to separate materials based on their specific weight. Here's all you need to know about gravity destoners:


Operating Principle:

The gravity destoner relies on the difference in specific weight between the grains or seeds and the heavier impurities. The material to be processed is fed onto a vibrating deck or table, where an upward airflow is applied. As the deck vibrates, the lighter grains or seeds rise to the top due to the airflow, while the heavier impurities, such as stones, settle to the bottom. The separated stones are discharged from the machine, while the clean product moves along the deck for further processing.


Adjustable Parameters:

Gravity destoners offer adjustable parameters to optimize the separation process for different crops and impurity levels. These parameters typically include deck inclination, airflow speed, and vibration intensity. By adjusting these parameters, operators can fine-tune the separation process to achieve optimal results.



Gravity destoners are commonly used in the agricultural industry for various crops, including grains, seeds, beans, lentils, and more. They are particularly useful in the processing of cereals like wheat, rice, corn, barley, and oats. Gravity destoners efficiently remove heavy impurities, such as stones, clods, dirt, and metallic particles, ensuring the quality and purity of the final product. They are widely employed in grain processing plants, seed cleaning facilities, flour mills, and other processing operations.


gravity destoner

TQSFB Gravvity Destoner


1. Efficient Heavy Impurity Removal:

Gravity destoners are highly effective at removing heavy impurities, such as stones, from grains and seeds. The specific weight difference between the impurities and the product allows for efficient separation, resulting in clean and high-quality output.

2. Improved Product Quality: 

By eliminating stones and other heavy impurities, gravity destoner enhance the quality of the processed material. This not only improves the appearance and market value of the product but also prevents damage to downstream machinery during further processing.

3. Versatility: 

Gravity destoners can handle a wide range of crops and grains, making them suitable for various applications. They can accommodate different sizes, shapes, and densities of materials, allowing for versatility in processing different types of crops.

4. Customizable and Adjustable: 

Gravity destoners often offer adjustable parameters, such as deck inclination, airflow speed, and vibration intensity. These customizable settings allow operators to optimize the machine's performance based on specific crop characteristics and impurity levels.

5. Minimal Maintenance: 

Gravity destoners typically have a straightforward design with few moving parts, resulting in low maintenance requirements. Regular cleaning and inspections are usually sufficient to ensure the machine's optimal performance and longevity.

6. Energy Efficiency: 

Gravity destoners are relatively energy-efficient machines, consuming minimal power during operation. This makes them cost-effective to run and environmentally friendly compared to other heavy impurity removal methods.



While gravity destoners offer effective heavy impurity removal, it's important to note that they may not be suitable for removing lighter impurities or contaminants such as dust, chaff, or husk. For comprehensive cleaning processes, additional equipment such as sieves, air aspirators, or magnetic separators may be required.


In summary, gravity destoners are valuable machines in the agricultural industry, providing efficient removal of heavy impurities from grains and seeds. Their reliance on density difference, gravity, and airflow enables effective separation and enhances the quality of the final product. With adjustable parameters and versatility in handling various crops, gravity destoners are reliable and customizable machines that contribute to efficient and high-quality grain processing operations.

gravity destoner