What is a Pressure Screen Rotor? Analysis of Core Functions

The rotor is the core moving component in the pressure screen of a pulping and screening equipment. It is cylindrical or shaft-shaped and equipped with specific blades. The design of the rotor and screen basket combination directly determines and affects the optimal performance of the pressure screen. the pressure screen rotor rotates inside or outside the screen basket, and the blade on the rotor runs closely to the screen basket. At the front of the rotor, the rotor generates pressure on the slurry, allowing it to pass quickly. At the rear of the rotor, negative pressure is formed, and the purified pulp backwashs the screen basket to prevent the screen holes from being blocked. The pressure screen adopts an upward flow structure design with bottom pulp inlet, bottom heavy slag discharge, and top light slag discharge, effectively solving the above problems. Light impurities and air in the pulp naturally rise to the top slag discharge outlet and are discharged, while heavy impurities can settle to the bottom and be discharged as soon as they enter the machine. In this way, the pressure screen rotor effectively shortens the residence time of impurities in the screening area, reduces the possibility of impurity circulation, and improves screening efficiency; On the other hand, it prevents damage to the rotor and screen basket caused by heavy impurities, extending the service life of the equipment.

Detailed Functions of the Pressure Screen Rotor

Generate pressure pulse: When the rotor rotates, the front applies pressure to accelerate the passage of the pulp, and the rear forms a negative pressure backwash screen basket to prevent screen hole blockage.
Graded screening: Efficient separation of fibers and impurities is achieved through wing blocks of different shapes, such as feeding and mixing zones.

The Component of Pressure Screen

The pressure screen rotor is the core component of the pressure screen, with a complex and precise structure. The interior of the pressure screen is mainly composed of the following parts:

• Rotor: The rotor is the driving part of the rotor, usually made of high-quality metal materials to ensure its strength and wear resistance. The rotor is connected to the screen body through bearings and can rotate freely inside the screen body.
• Screen basket: The screen basket is a cylindrical component installed on the rotor, with its surface covered with small screen holes. The function of the screen basket is to intercept impurities and coarse particles in the pulp, allowing only small fibers and liquids to pass through.
• Screen plate: The screen plate is located inside the screen basket and closely matches with the screen basket. There are also screen holes on the screen plate, but the aperture is usually smaller than the screen holes on the screen basket to further refine the screening effect.

Working Principle of Pressure Screen Rotor

The working principle of a pressure screen mainly relies on the centrifugal force generated by the rotation of the rotor. When the pulp is fed into the pressure screen, it is first driven by the rotor, producing strong rotational motion. Under the action of centrifugal force, fibers and liquids in the pulp are forced to pass through the screen holes on the screen basket and screen plate, while impurities and coarse particles are intercepted due to their inability to pass through the screen holes.

The Screening Process Can be Divided Into the Following Steps

• Pulp entry: The pulp enters the pressure screen through the feeding port and is evenly distributed around the rotor.
• Rotating motion: The rotor drives the pulp to rotate at high speed, generating strong centrifugal force.
• Screening and separation: Under the action of centrifugal force, small fibers and liquids pass through the screen basket and screen plate holes, and enter the next process; Impurities and coarse particles are intercepted between the screen basket and screen plate, forming residue.
• Residue discharge: The residue is regularly discharged through the slag discharge outlet to maintain the normal operation of the pressure screen.