mechanism of operation of vibro sifter and mechanical sifters

Mechanism of Operation of Vibro Sifters and Mechanical Sifters

Vibro sifters and mechanical sifters are widely used in industries such as pharmaceuticals, food processing, chemicals, and mining for particle size separation, grading, and impurity removal. While both serve similar purposes, their operating mechanisms differ.

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## 1. Vibro Sifter (Vibratory Sifter)
A vibro sifter uses vibration to separate particles based on size. It consists of a motor with an unbalanced weight that generates vibrations, causing material to move across sieving surfaces.

Key Components:
– Motor with Unbalanced Weights – Creates vibratory motion.
– Screen Mesh – Determines particle size separation.
– Springs or Rubber Mounts – Amplify and control vibration.
– Sieve Deck – Holds the mesh for multi-layer screening.
– Outlet Ports – Separate oversize and undersize particles.

Working Principle:
1. Material Feeding – The product is fed onto the top screen.
2. Vibration Generation – The motor rotates unbalanced weights, creating a 3D vibratory motion (vertical + horizontal).
3. Particle Separation:
– Fine particles pass through the mesh (undersize).
– Coarse particles travel across the screen and exit through the oversize outlet.
4. Discharge – Separated fractions are collected in different compartments.

Advantages:
– High efficiency due to multi-directional vibration.
– Minimal clogging due to continuous movement.
– Suitable for fine powders and fragile materials.

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## 2. Mechanical Sifter (Rotary or Gyratory Sifter)
A mechanical sifter typically uses a rotating or gyratory motion to separate particles. It relies on mechanical force rather than vibration.

Key Components:
– Rotating Shaft with Eccentric Weights or Cams – Generates gyratory motion.
– Screen Mesh – For particle classification.
– Drive Mechanism (Motor & Gearbox) – Controls speed and motion.
– Discharge Chutes – For separated fractions.

Working Principle:
1. Material Feeding – The product is introduced at the center of the screen.
2. Gyratory Motion:
– In rotary sifters, a spinning mechanism throws material outward.
– In gyratory sift