hammer crusher basics ppt

Hammer Crusher Basics: A Comprehensive Overview

Hammer crushers are widely used in the mining, cement, coal, metallurgy, building materials, and chemical industries for crushing medium-hard and brittle materials. These machines are known for their high reduction ratios, simple structure, and ease of maintenance. Understanding the basic principles and components of hammer crushers is essential for optimizing their performance and ensuring efficient operation.

Working Principle
The hammer crusher operates on the principle of impact crushing. The material is fed into the crushing chamber, where it is struck by high-speed rotating hammers. The hammers are mounted on a rotor, which rotates at high speeds, typically between 800 to 3,000 RPM. As the material is struck by the hammers, it shatters upon impact with the breaker plates or liners inside the crushing chamber. The crushed material then passes through grates or screens at the bottom of the crusher, which determine the final particle size.

Key Components
1. Rotor: The rotor is the central rotating component of the hammer crusher. It consists of a shaft, discs, and hammer pins that hold the hammers in place. The rotor’s speed and design significantly influence the crusher’s efficiency and output.
2. Hammers: These are the primary wear parts of the crusher and are responsible for delivering the impact force to the material. Hammers can be fixed or swing-type, depending on the design. They are typically made from high-manganese steel or other wear-resistant alloys to withstand repeated impacts.
3. Breaker Plates/Liners: These are stationary components located inside the crushing chamber. They work in conjunction with the hammers to break down the material by providing additional impact surfaces.
4. Grates/Screens: Positioned at the bottom of the crushing chamber, these components control the size of the crushed material by allowing only particles of a certain size to pass through.

Types of Hammer Crushers
1. Single-Stage Hammer Crusher: Designed for primary crushing, this type features a single rotor and is suitable for materials with low abrasiveness and medium hardness.
2. Double-Rotor Hammer Crusher: Equipped with two rotors rotating in opposite directions, this type offers higher crushing efficiency and is ideal for tougher materials.
3. Reversible Hammer Crusher: This design allows the rotor to rotate in both directions, extending the lifespan of the hammers by utilizing both ends for crushing