The parts of a sieve shaker include the sieve, screen frame, and skirt, with additional components and mechanisms designed to enhance the shaking motion and reduce noise.
Sieve: The sieve is the primary component where the material is separated by size. It is typically made of stainless steel woven wire mesh with various opening sizes ranging from 5 inches (125 mm) to 635 mesh (20 microns). The mesh size determines the smallest particle size that can pass through.
Screen Frame: This is the circular metal ring that holds the mesh in place. It can be made of stainless steel or brass and comes in standard sizes such as 3", 8", and 12" in the US, or 100mm, 200mm, and 300mm internationally. The frame ensures the stability and proper alignment of the mesh during the sieving process.
Skirt: The skirt is a component that helps in stacking the sieves without them tipping over. This is crucial for maintaining the order of sieves with different mesh sizes when multiple sieves are used in a stack.
Additional mechanisms in sieve shakers include:
- Sieve Plate and Cam: In some designs, a sieve plate sits on a cam driven by a belt and electric motor, providing the necessary shaking motion.
- Offset Weights and Springs: These are mounted to create an orbital motion by oscillating the weights, which helps in agitating the material effectively.
- Horizontal Leaf Springs and Magnet: These components work together to create a dynamic shaking motion by utilizing a rotating electrical field.
- Rubber Posts: These are compressed and released by a magnetic field, contributing to the shaking action and reducing noise.
- Sound Damping Enclosure: Used to minimize noise by enclosing the noisy parts of the shaker.
The selection of a sieve shaker depends on the characteristics of the material being tested, such as the minimum size to be separated, resistance to agglomeration, and static electric factors. Different types of sieve shakers, such as electromagnetic, Rotap, ultrasonic, and DH-300T, are designed to handle specific material properties and sieving requirements. Each variant is capable of delivering a certain number of oscillations and taps per minute, controlled by a digital timer for precise testing durations.
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