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Crushers

       Impact-centrifugal crushers make it possible to perform the operations of crushing of any hard-ness materials, abrasive difficult-to-machine materials including. The basis of SPA “Center” crushers’ con-struction is a supporting assembly "on an air cushion" which enables the self-balancing system of the working unit of the crusher to be created as well as the stable work of the equipment to be maintained at considerable unbalances arising from the uneven wear of the working parts and the uneven distribution of the material. This gives decisive advantages to our crushers in comparison with both centrifugal crushers having support-ing assemblies of rolling and conventional crushing equipment – cone, jaw, hammer and rotary crushers. The most considerable advantage is low capital and working costs which are under the influence of the following factors:
 to mount the crushes it is not required to have special foundations,  they can be installed on an even site and at any level of a production building;
 the design itself secures simplicity and conveniences to do the job on the replacement of the lining elements in the accelerator due to unconventionally made assemblies and fastenings;
 it is not required to do a dynamic balancing of the accelerator after the lining elements have been replaced;
 the crushers show stable work without vibrations at unbalances reaching 2 kg;
 the cost of the lining elements is 3-4 cents per ton of the material being crushed;
 the grain composition of crushed material does not depend on the wear of the lining elements.
 

                                                    Technical properties

The general principle of operation of an impact-centrifugal crusher is shown in Fig. 1. By a high-pressure fan (8) in the chamber (7) the air pressure necessary for the «floating» of the rotor and for forming an air gap between the rotor (5) and stator (6) is generated. The originated air cushion under the rotor fulfils the role of a gas bearing. The unique construction of the crusher’s working body is a self-balancing system and it secures a stable work of the equipment.
Through funnels (1) the source product is fed into the separating cone (2) which distributes the product evenly along the channels of the accelerator (3). Having got in
the rotating accelerator peripheral velocity necessary for the ejection and respectively kinetic energy, the source
material strikes against the crushing chamber surface (4) and breaks down.  (See Fig. 1).


Impact-centrifugal crushers make it possible:

 to break materials of any strength and hardness;
 to increase considerably the degree of crushing and to extend the range of controlling the fractions’ content in the product;
 to redistribute the correlation of crushing and milling operations towards the increase of the former  and to reduce the total costs for obtaining the final product;
 to reduce the feed-size of the comminuting equipment at further stages of the process of concentra-tion and thereby to raise the productivity  of comminuting redistribution  by no less than 30%;
 at the cost of selectivity of impact breakage to start beneficiation at the stage of crushing;
 to obtain crushed rock with high consumer properties:

- the content of prickly and plate-like particles in crushed stone corresponds to group I in compli-ance with State Standard 8267-93;
- the strength of crushed stone is 10-15% higher than the initial strength;
- the dustiness of finished fractions after screening does not normally exceed 1%;
- the riddling (0-5 mm) which is obtained at screening of crushed product in its granule composi-tion and isometric grain shape can be either an excellent filler material for road concrete mix or feedstock for obtaining high quality building materials.