What is a Pressure Screen Rotor
The pressure screen rotor is the core component in pressure screen, and its working principle is based on the synergistic effect of rotor rotation and screen basket, achieving efficient screening through pressure pulses and shear forces.
The screen basket is a cylindrical or conical body with a large number of precise sieve slots or holes on its surface. Pressure screen rotor with a rotor blades is installed inside or outside the screen basket (depending on the pressure screen type). The pressure screen rotor rotates at high speed tightly against the inner surface of the screen basket.
The pressure screen rotor is same as the screen basket, it has inflow screen rotor and outflow screen rotor. The inflow screen rotor is that the pulp flows from the inside of the screen basket to the outside, with the screen basket fixed and the rotor rotating inside the screen basket (most commonly). The outflow screen rotor is that the pulp flows from the outside to the inside of the screen basket, which is fixed and the rotor rotates outside the screen basket (rarely seen).
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The Function of Pressure Screen Rotor
The rotation of the screen rotor generates pressure pulses: the rotor on the rotor rotates closely to the inner surface of the screen basket at high speed, applying positive pressure to the pulp at the front of the rotor, pushing the pulp quickly through the screen slot or sieve hole; At the rear of the rotor, an instantaneous negative pressure (suction force) is formed due to the increase in clearance, generating negative pressure pulses that suck in good pulp (qualified fibers and fine substances) and pass them through the screen basket, while also playing a backwash role to prevent screen hole blockage.
Shear force and turbulence blockage prevention: The strong hydraulic shear force and turbulence generated by the rotation of the pressure screen rotor can flush the screen gaps/holes, damage the fiber bridging or flocs, and keep the screening channel unobstructed; Turbulence also drives the trapped large particles of impurities to move towards the tailings outlet, achieving impurity transport.
Structural design optimization separation: Different types of pressure screens (such as internal flow and upward flow) optimize the separation effect through the feeding direction and slag discharge layout. For example, the upward flow structure uses gravity stratification to make light impurities rise and heavy impurities sink, shorten impurity residence time, improve screening efficiency, and reduce equipment wear.
