Vibrating screen drive: how is the vibratory motion imparted to the screening surface in high-capacity industrial screens?

Introduction / Context:
Vibrating screens rely on controlled vibrations to stratify and convey particles across apertures. Several mechanical and electromagnetic methods exist to generate the required motion, and selection depends on size, duty, and process environment.

Given Data / Assumptions:

• Industrial screens handling large tonnages.
• Drive options include mechanical and electromagnetic exciters.
• Goal is appropriate amplitude and frequency for the material.

Concept / Approach:
Cams/eccentric shafts and unbalanced flywheels are common mechanical exciters that produce sinusoidal or elliptical motion. Electromagnetic drives (for smaller units) generate controllable high-frequency, low-amplitude vibration suitable for fine screening or feeder applications. Any of these can impart vibration to a screen, subject to design constraints.

Step-by-Step Solution:
Recognize multiple viable excitation methods.Match methods to typical applications (coarse/high tonnage vs fine/controlled feeders).Conclude that all listed methods can be used → choose the inclusive option.

Verification / Alternative check:
Equipment catalogs list eccentric shaft screens, unbalanced motor screens, and electromagnetic vibratory feeders/screens.

Why Other Options Are Wrong:
Selecting a single method ignores the diversity of industrial designs.

Common Pitfalls:
Assuming electromagnetic drives are only for feeders; they are also used for fine screens where precise control is critical.

Final Answer:
Either (a), (b) or (c).