Hammer Crushers

Appointment

Hammer crushers are used for crushing wood waste (chips, bark, shavings, etc.) by crushing with hammer blows pivotally mounted on the crusher rotor.

Characteristic

Types of crushers:

1. For grinding wet raw materials: the reversible rotation of the rotor ensures uniform wear of the hammers. The hammers are made of high-strength steel.
2. For crushing dry raw materials: a high degree of crushing is achieved due to the high density of hammers (96 pcs.) and two decks with a small tooth.
3. For grinding mixed raw materials, wet and dry, they are important in the case of working with low–quality raw materials. The presence of 3 decks allows you to work with chips with a size of 50x30x10mm. The reversible rotation of the rotor ensures uniform wear of the hammers. The design is convenient for maintenance and quick replacement of sieves.

When choosing a hammer crusher, first of all, it is necessary to focus on the productivity of the crusher. The productivity of the crusher depends on many factors:

• The size of the incoming and outgoing material. This affects the energy required for crushing.
• The humidity of the incoming raw materials. At high humidity, the load on the purge of the crushing chamber increases.
• The hardness and viscosity of the material. High hardness leads to an increase in crushing energy. Viscous material, like raw material, requires a good purge of the crushing chamber.
• Stability of the particle size of the supplied material.

To maintain the uniformity of the obtained fraction, there are replaceable sieves on the crushers.

The productivity of the crushers depends on:

• Engine power: The more powerful the crusher's engine, the more material it can process per unit of time.
• The size and shape of incoming and outgoing raw materials. Large and hard pieces of material require more time and energy to crush than small and soft pieces.
• Humidity and density of raw materials: wet or dense material requires more energy and time for crushing.
• The hardness and viscosity of the material. The higher the hardness, the more energy is required for crushing. Viscous material, like raw material, requires a purge of the crushing chamber.
• Uniformity of the feed of raw materials into the crushing chamber.

The principle of operation

Raw materials are fed into the crushing chamber using a screw dispenser or a pneumatic receiver. Under the influence of a shock load, the material is destroyed, all particles having a size smaller than the sieve opening are removed from the crushing chamber using purged air. Large particles are stored in the chamber before grinding.

The grinding process is carried out by hitting the product with rapidly rotating working bodies at a speed of 90 m/s, such an impact provides the most economical specific energy consumption compared to other types of crushers.

Advantages

Advantages of crushers for crushing dry raw materials:

• Energy efficiency
• High performance
• High degree of crushing
• Compactness

Advantages of mixed-type crushers for crushing dry and wet raw materials:

• Increased area of calibration sieves
• Stamina reserve for intensive work
• Reverse rotation of the rotor
• Availability of 3 decks
• The design is convenient for maintenance and quick replacement of sieves

Advantages of crushers for crushing dry raw materials:

• Reverse rotation of the rotor
• Convenient maintenance and quick replacement of sieves
• High margin of safety