Knife Bar Plain Type Oil Expeller

A Knife Bar oil expeller is a type of mechanical oil extraction equipment used to extract oil from oil-bearing seeds, nuts, or oil-rich crops. This type of expeller is distinguished by the presence of a rotating knife or blades inside a cylindrical chamber instead of the traditional screw or central bar found in other oil expellers. The design and operation of a Knife Bar oil expeller are as follows:

• Hopper: Similar to other oil expellers, the raw material (seeds, nuts, or oil-rich crops) is loaded into a hopper that feeds the material into the expeller chamber.
• Expeller Chamber: The expeller chamber in a Knife Bar oil expeller is a cylindrical enclosure where oil extraction takes place. It contains a rotating knife bar or blade assembly.
• Knife Bar or Blade Assembly: The central component of this type of expeller is the knife bar or blade assembly. It consists of sharp-edged blades that rotate within the chamber. These blades chop and shear the material as it passes through the chamber, creating a fine slurry.
• Cage or Perforated Cylinder: Surrounding the knife bar assembly is a cage or perforated cylinder with openings that allow the oil to flow out while keeping the solid material contained within the chamber.
• Pressure Adjustment: Some Knife Bar oil expellers have adjustable pressure settings, allowing operators to control the pressure applied to the material. This adjustment helps optimize oil extraction efficiency.
• Drive Mechanism: The knife bar assembly is connected to a motor or an external power source, which rotates the blades at a controlled speed.
• Oil Outlet: As the material is subjected to the cutting action of the rotating blades, oil is released from the oil-bearing cells. The oil flows through the perforations in the cage and collects in a receptacle or trough at the bottom of the expeller.
• Residue Outlet: The solid residue, often referred to as the cake, exits the expeller through a separate outlet. This cake can be used as animal feed or further processed for various applications.
• Heating: In some cases, Knife Bar oil expellers may incorporate a heating component to reduce the viscosity of the oil and improve extraction efficiency, particularly when processing materials with high oil content.

The operation of a Knife Bar oil expeller involves continuously feeding the raw material into the hopper, which is then chopped and sheared by the rotating knife bar assembly within the expeller chamber. This mechanical action breaks down the oil-bearing cells and releases the oil, which is collected through the perforations in the cage. The remaining solid cake is expelled through a separate outlet.

Knife Bar oil expellers are suitable for processing a variety of oilseeds and crops, including soybeans, rapeseed, sunflower seeds, and more. They are particularly effective when dealing with materials that are difficult to extract using traditional screw or central bar expellers, thanks to their cutting and shearing action. These expellers are commonly used in medium to large-scale oil extraction operations.