Centrifugal crushers DC

General information

DC centrifugal crushers are high performance crushers of the centrifugal impact operating principle, that are used for grinding, granulating, and crushing of ore and non-ore materials of different strength and hardness.

DC centrifugal (impact) crushers are successfully applied in production of cubiform crushed stone, building sand, and other fillers at the final stages of crushing, when major quality characteristics of the final products are formed.

The key advantage of DC centrifugal impact crushers’ use is the possibility to produce high quality product with the required parameters from the absolute majority of ore and non-ore materials along with the high rates of economical and operational efficiency, unreachable with the use of other existent crushing methods.

High use factor, low maintenance cost, and ease of servicing are the important features of DC centrifugal impact crushers’ application. Component parts wear does not affect the crushing operation and the final product quality. DC centrifugal impact crusher does not require observance of any specific conditions or restrictions concerning the cave operation.

Deferring to our vast experience, we based the DC crusher design on our patented unique solutions that became key factors for low operation cost and high technical specifications of the equipment.

DC centrifugal crushers allow achieving the high material crushing fineness that is hard to obtain with the help of other crushing equipment of the essentially similar operating principle. It becomes possible due to the high material discharge rate, which is provided by the gasostatic support system, which is a unique engineering solution by our Company.

Gasostatic support use enables high speed rotation of the crusher’s operating elements with no vibration at significant imbalances, providing high reliability.

More detailed information on the advantages, operating principle, technical specifications, and operational characteristics of DC centrifugal crushers, as well as the configurations and options information, may be viewed in the further tabs of this section.

Advantages

Final product quality

• High concentration ratio.
• Consistent granulometric composition of the final product, independent of wear parts condition.
• Isometric (cubiform) shape of the produced grain within the whole fineness range of around 90%.
• One-step increase of the crushed stone strength and abrasion capacity grade.
• Mechanical adjustment and tuning is not required. Mode adjustment is carried out via the crusher’s control unit and enables adjustment of the final product granulometric composition in the course of operation.

Reliability

• Freedom from frictional elements and absence of operating elements collision in the course of crushing (incl. collision by means of crushed material). Low vibration level, no mechanically loaded elements and systems.
• Uncrushable inclusions comparable to the feeding fineness do not cause breakages and do not require operation stoppage.
• No specific requirements to the cave operation, stable operation at uneven distribution of the material and significant imbalances.
• Crushing station’s basic configuration includes automated and mechanical operation protection systems.

Economical efficiency

• Low operational costs.
• High reliability, low maintenance time, and long servicing intervals provide efficient equipment operation with the use factor of 0.9.
• Low power consumption: DC crushers have one of the lowest power consumption indices (in comparison with tertiary and quaternary rotor, gyratory cone, inertial, and other crushers).

Ease of maintenance

• Freedom from the oil-pumping station and hydraulic systems.
• High repairability of the equipment.
• Does not require adjustment after regular stops.
• All the servicing and wear parts replacement works can be made within 1.5 hours (1-2 workers required), and do not require highly qualified personnel assignment.

Mobility

• Does not require special foundations, may be installed on the ground. 
• Easily reinstalled and integrated into the existent production lines without substantial capital investments.

Operating principle

DC centrifugal impact crusher design is based upon the impact crushing method. Raw material particles are centrifugally accelerated and discharged into the crushing chamber. High kinetic energy of the particles ensures their disruption on colliding with a statical surface (crusher’s lining), which may be made as a wear plate (“rock against metal” disruption type) or material self-lining (“rock against rock” disruption type).

Patented air supporting node (so-called gasostatic support) is the cornerstone element of the described equipment. It ensures high technological capabilities of the equipment. Gasostatic support is the assembly of elements that widen under hydraulic pressure created by the air flow and constitute a “gas bearing”. Supporting part of the bearing assembly (stator) is statical. Dynamic part of the assembly (rotor) is mounted with an accelerator and a connecting rod of the cardan drive, which impacts rotational movement to the “rotor-accelerator” system from the crusher’s main drive engine (11). Gasostatic support is free from frictional forces (except for the air friction), vibrations, and mechanical interaction of assemblies. Thus, it enables creation of a self-balancing system of the “stator-rotor-accelerator” operating element (6, 5, 3) of the crusher.

Operating principle

High pressure fan (8) in the chamber (7) produces air pressure necessary for rotor (5) floating up and creation of a “gas bearing” of the system. Cardan drive (9) actuates the crusher’s operating element by rotating the accelerator. Raw crushing product is moved to the separating cone (2) of the accelerator via the feed hopper (1). Raw material is centrifugally distributed among the channels, where it fills special concavities of the accelerator, thus creating a lining layer. When the accelerator self-lining is finished, feeding material is centrifugally directed to the accelerator periphery along the lining layer formed by the material. Having reached the required circumferential speed, the material is discharged into the crushing chamber (4).

Crushing chamber of the crusher may be made either from special breaking elements or as a self-lining chamber. In the latter case the material fills special concavity of the crushing chamber and creates a self-lining layer. Material discharged from the accelerator is directed to the breaking surface of the crushing chamber with the high speed, where it is crushed due to free impact action. Particle intercollision contributes to the material crushing as well. Crushed product passes lateral down spouts of the crusher, and the final product is dicharged at the bottom of the station.

Crushing characteristics

Possibility of fine class products and sand and gravel mix reprocessing is an important aspect of DC centrifugal impact crusher’s application. When crushing 5-20 mm class with the DC, the number of crushed grains accounts for 95-98%.

Conventional crushing and screening lines consisting from jaw and cone crushers do not provide you with the possibility of producing crushed-gravel aggregate of fractions of less than 20 mm. Grains of material with the class of less than 20 mm pass the jaw openings of such crushers without incurring breaking.

Note:

¹ – some types of materials may require wet crushing with the addition of water directly into the crushing chamber.

² – it does not refer to the materials of a platelet or layered shape structure.