Classification and Working Principle of Vibrating Screens

A vibrating screen is a mechanical device designed for sieving particles, powders, and viscous materials. It is widely applied in the food, pharmaceutical, chemical, and metallurgical industries. During operation, the vibrating screen consistently maintains maximum screening force, offering high screening efficiency, large processing capacity, and easy screen replacement. This article outlines the classification and working principles of vibrating screens.

1. Classification of Vibrating Screens

Based on weight and application, vibrating screening equipment is categorized into mining vibrating screens, fine screening vibrating screens, and laboratory-specific vibrating screens.

1) Mining Vibrating Screens Include:

Eccentric circular vibrating screens, dewatering screens, probability screens, circular vibrating screens, drum screens, linear vibrating screens, etc.

2) Fine Screening Vibrating Screens Include:

Three-dimensional rotary vibrating screens, ultrasonic vibrating screens, swing screens, linear vibrating screens, straight-line screens, high-frequency vibrating screens.
For additional options such as horizontal airflow screens and inspection screens, please refer to our complete vibrating screen series.

2. Working Principle of Vibrating Screens

1) Three-Dimensional Rotary Vibrating Screen

It utilizes a vertical motor as the excitation source, with eccentric weights installed at both the upper and lower ends of the motor. This setup converts the motor’s rotational motion into a complex three-dimensional movement—horizontal, vertical, and inclined—which then tr

Transfer this motion to the screen surface. Adjusting the phase angle of the upper and lower ends can change the movement trajectory of the material on the screen surface. Suitable for food, pharmaceutical, chemical, metallurgical and other industries.

2) Linear vibrating screen

The linear vibrating screen is driven by dual vibrating motors. When the two vibrating motors rotate synchronously and in opposite directions, the exciting forces generated by the eccentric masses cancel each other out in the direction parallel to the motor axis. A resultant force is stacked in the direction perpendicular to the motor shaft, causing the screen to move in a straight-line trajectory. The two motor shafts have an inclination angle relative to the screen surface. Under the combined action of the exciting force and the material’s self-gravity, materials are thrown up and jump forward on the screen surface for linear motion, achieving the purpose of screening and grading. It can be used to realize automated operations in assembly lines. It features low energy consumption, high efficiency, simple structure, easy maintenance, and a fully enclosed design that prevents dust spillage. The maximum sieving mesh is 400 meshes, capable of separating materials into 7 different particle sizes.

3) Swing Screen

The swing screen is a low-frequency rotary vibrating screen that mimics manual shaking. Its operating principle involves instantaneous motion combining radial displacement with circular motion around the displacement axis (spiral motion). An exciter capable of adjusting eccentricity generates nonlinear three-dimensional movement, causing materials to move similarly to manual sifting, thereby achieving effective screening. When combined with appropriate screening accessories, it delivers superior separation results. This equipment is ideal for spherical, cylindrical, flake-like, or irregularly shaped materials prone to mesh clogging and requiring high-precision screening.

4) Vibrating screen for mine

This series of linear vibrating screens offers two drive configurations: direct drive via a vibrating motor, and indirect drive where an ordinary motor powers the vibration exciter through a coupling. This flexibility ensures optimal performance across diverse operating environments. The screen media is available in various forms, including metal woven mesh, rods, castings, welded structures, and punched plates. With options for single-layer or multi-layer arrangements, these screens are engineered to meet specific screening requirements. They are widely used as screening machines in industries such as metallurgy, mining, coal, building materials, power generation, chemicals, and more.

Different vibrating screens possess unique characteristics and functions. If you have any further questions after reading this article, you can contact us. We will provide detailed answers to help guide your decision-making.