Combine concaves

A combine harvester is an agricultural machine that is used to harvest grain crops such as wheat, barley, oats, and corn. It performs several functions such as cutting the crop, threshing the grain from the crop, separating the grain from the chaff, and cleaning the grain before it is stored in a tank or wagon. One of the critical components of a combine harvester is the combine concave.

The combine concave is a metal plate that is installed inside the combine harvester's threshing chamber. It is designed to separate the grain from the crop and the chaff by using a series of ridges and bars. When the crop is fed into the threshing chamber, the concave bars rub against the crop, causing the grain to separate from the chaff.

There are different types of combine concaves available, and they are designed to suit different types of crops and harvest conditions. One type of concave is the wire concave, which is made of steel wires that are woven together to form a mesh. This type of concave is ideal for harvesting small grains such as wheat, barley, and oats.

Another type of concave is the round bar concave, which has a series of round bars that are spaced apart. This type of concave is ideal for harvesting larger crops such as corn and soybeans.

To improve the performance of the combine harvester, multiple concaves are often used in combination. The most common arrangement is to use two or three concaves in sequence. The first concave is usually a wire concave, which helps to break up the crop and remove any debris. The second concave is often a round bar concave, which is used to separate the grain from the chaff. The third concave, if used, is typically a wrap-around concave that is designed to help clean the grain before it is stored.

In summary, the combine concave is a crucial component of a combine harvester. It is responsible for separating the grain from the chaff and cleaning the grain before it is stored. By using multiple concaves in combination, the performance of the combine harvester can be improved, and the quality of the harvested grain can be increased.


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Combine concave

The combine concave performs two important functions in your combine harvester - threshing and separating. Threshing  frees the seeds from the plants and separation moves the seeds away from the chaff.

Friction among concave, rotating cylinder and the incoming crop results in the threshing process. The clearance between the cylinder and the concave is adjustable. Once the crop enters the clearance, it gets squashed by the cylinder against the concave and smaller parts start to sift through the openings. As a result, the grain is separated from the plants.

The clearance distance, the bar and wire patterns of the concave, the speed of the rotor, and the crop types determine how clean the samples turn out in the grain tank. It takes a bit of experience to understand how all these factors influence the process.

Achieving a balance between cylinder speed and concave clearance is like walking on a rope. The purpose of this gap between is to control the optimal flow of material. With a large gap, the grains do not separate, while with a narrow one it can lead to grain damage. As a rule, start with the recommended clearance settings. Then you can adjust according to the field conditions.

Combine concaves come with different types of bars and wires. Narrow-wired concaves are great for small grains like wheat and barley. The narrow spacings between the wires allow the small seeds to sift through. Wide-wired ones are for crops like corn or beans. 

To improve the threshing process you can use cover plates an addition to the concave clearance and design patterns. The plates are used to cover up certain parts of the concaves to let the material stay longer between the concave and threshing cylinder.

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