Working Principle of Circular Vibrating Screens
The working principle of circular vibrating screens is as follows: after the vibrating screen is started, the vibrating screen exciter drives the vibrating screen box to perform directed jumping motion. Simultaneously, materials smaller than the screen aperture pass through the apertures and fall into the lower layer, becoming the material beneath the screen apertures. Materials larger than the screen aperture diameter are continuously jumped and discharged through the outlet, ultimately completing the screening process.
(1) Throwing Index
Generally, based on screening applications, circular vibrating screens typically use KV = 3–5, while linear vibrating screens use KV = 2.5–4. Higher values are selected for difficult-to-screen materials, and lower values for easy-to-screen materials. Higher values are chosen for smaller screen openings, and lower values for larger screen openings.
(2) Vibration Intensity
The selection of vibration intensity K is primarily constrained by material strength and component stiffness. Currently, K values generally range from 3 to 8 in mechanical applications, with vibrating screens typically using values between 3 and 6.
(3) Screen Surface Inclination Angle
Circular vibrating screens generally use an inclination angle of 15° to 25°, with smaller values chosen for larger amplitudes and larger values for smaller amplitudes.
(4) Screen box amplitude
Screen box amplitude A is a critical design parameter for screens, and its value must be appropriate to ensure complete material layering, reduce blockages, and facilitate screening. Generally, A is set to 3–6 mm, with larger values for larger screen openings and smaller values for smaller openings.
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