principle of working crusher pdf

Working Principle of Crushers: A Comprehensive Guide

Crushers are essential machines used in mining, construction, and recycling industries to reduce the size of large rocks, ores, or waste materials into smaller, more manageable pieces. Understanding the working principle of crushers helps optimize their performance and efficiency. Below is a detailed explanation of how different types of crushers operate.

1. Jaw Crushers
Jaw crushers are primary crushers that use compressive force to break down materials. The machine consists of two vertical jaws—one fixed and one movable. When the movable jaw moves toward the fixed jaw, it exerts pressure on the material trapped between them, causing it to fracture into smaller pieces. The crushed material exits through the discharge opening at the bottom.

Key Features:
- Simple structure with high reliability.
- Suitable for hard and abrasive materials.
- Adjustable discharge size for different applications.

2. Impact Crushers
Impact crushers utilize high-speed impact forces to crush materials. These machines feature a rotor with hammers or blow bars that strike incoming material at high velocity, breaking it apart upon impact. The shattered particles are then thrown against breaker plates or liners for further reduction.

Key Features:
- Ideal for softer or less abrasive materials like limestone and recycled concrete.
- Produces cubical-shaped end products.
- Can be used in primary, secondary, or tertiary crushing stages.

3. Cone Crushers
Cone crushers operate by compressing material between a rotating mantle and a stationary concave liner. As the mantle gyrates within the crushing chamber, it continuously squeezes rock particles until they break apart and exit through the discharge opening.

Key Features:
- Efficient for medium to hard materials like granite and basalt.
- Provides consistent particle size distribution.
- Hydraulic adjustment allows precise control over output size.

4. Gyratory Crushers
Gyratory crushers function similarly to jaw crushers but have a conical crushing head instead of flat jaws. The crushing action occurs when the central spindle rotates eccentrically within a concave bowl-shaped housing, applying compressive force to crush large rocks.

Key Features:
- High capacity compared to jaw crushers.
- Commonly used in large-scale mining operations.
- Requires stable foundation due to heavy-duty operation.

5.Roll Crushers
Roll crushers consist of two counter-rotating cylinders that compress material fed between them.The crushed product exits through adjustable gaps between rollers