SV Technocrats India’s Gyratory Sieve Shaker is a mechanical device used for particle size analysis of aggregates, sand, cement, soil, and other granular materials. It operates by providing a gyratory (circular and tilting) motion to stacked test sieves, ensuring efficient material separation. It is commonly used in laboratories for sieve analysis, conforming to standards like IS: 2720 (Part 4), ASTM E11, and BS 410.
Components of a Gyratory Sieve Shaker
Sieve Stack Holder – Supports multiple test sieves.
Motorized Drive System – Provides uniform gyratory motion.
Eccentric Mechanism – Converts rotary motion into circular tilting movement.
Timer Control – Allows precise setting of test duration.
Base Frame – Ensures stability during operation.
Operating Principle
The machine imparts a horizontal circular motion combined with a slight vertical tap.
Material placed in the top sieve is separated based on particle size, with finer particles passing through lower sieves.
The collected fractions in different sieves help in grading analysis of materials.
Testing Procedure Using Gyratory Sieve Shaker
1. Sieve Selection & Setup
Choose sieves of appropriate mesh sizes based on the material.
Stack sieves in descending order of mesh size (largest mesh on top, smallest at the bottom).
Secure the sieve stack in the shaker.
2. Sample Preparation
Weigh a representative sample (e.g., 1kg of sand or aggregates).
Pour it into the top sieve.
3. Sieve Shaking Process
Set the timer (typically 5 to 10 minutes).
Start the machine; it will perform a gyratory and tilting motion.
4. Analysis & Calculation
After completion, weigh the material retained on each sieve.
Calculate percentage retained, percentage passing, and the particle size distribution curve.
Applications of Gyratory Sieve Shaker
✅ Aggregate & Sand Testing – Ensures materials meet grading specifications for concrete and asphalt.
✅ Cement & Soil Analysis – Helps determine fineness modulus and grain distribution.
✅ Powder & Granular Material Testing – Used in food, pharmaceutical, and chemical industries.
