③ Calculates with the average granularity

In this in the formula

 ——Stave front material mean diameter;

 ——After stave material mean diameter.

This method obtains the reduction ratio, can be able really to reflect the stave degree, thus the fundamental research often uses it.

3) Crushing circuit

The undressed ore enters the rod to sieve 1 advanced to carry on sieves in advance, thus like this may the thin grade branch out the undressed ore in, reduces the breaker load. After sieves the material to enter the cycle breaker 2 miles, to pass through stave, the obtained product all falls with 1 undersize material to the shaker on 3, after the screening, sieves the material to enter the garrulous circular cone breaker (i.e. intermediate crusher), the undersize material falls to the shaker on 5.The product 4 discharges which from the intermediate crusher also falls to the shaker on 5.After the screening, sieves the material to enter the circular cone breaker again in broken bits (i.e. small aggregate crusher) in. Thus, the shaker 5 not only is sieves also is in advance inspects the screening, the inspection screening function, is the breaker dump carries on the screening, its step sizing was equal to approximately sieves the size of mesh in advance. Sieves the unqualified material to enter small aggregate crusher 6, its product returns to the shaker 5, but the undersize quality products fall the bunker 7 miles, then enters ball mill 8.The shaker 5 on unqualified materials enter small aggregate crusher 6 again.

In this flow, the small aggregate crusher is staving for the close up, the cycle and the intermediate crusher basket opening is staving. The cycle breaker is a section stave (one time stave).The intermediate crusher is two sections stave (two times stave), the small aggregate crusher is three sections stave (three times stave).The entire flow also may be called the thick garrulous section, the garrulous section, Duane Jammu in broken bits the garrulous section.

2 Stave machinery prime task principles

Because the material pellet shape is irregular, moreover the material nature is different, therefore uses the smashing method is also different, has the following several methods differently using the mechanical power smashing material according to the rate of head movement:

1) Crushing

Puts in between two working surfaces the material, after because the infliction pressure, the material the compressed stress achieved its compressive strength breaks, this method general use in staves bulk material.

2) Splitting

Puts in a plane and between a belt capital edge work plane the material, when belt capital edge work plane to material extrusion,the material will chop into pieces along the pressure action line direction. The cleavage reason is because in the cleavage plane tensile stress achieved or surpasses the material tensile strength limit. Material tensile strength limit compared to compressive strength limit small very many

3) Snapping

Material bending stress function staves. Breaks the material withstanding concentrated load function two pivot simple beam or multi-pivot Lang.When the material bending stress achieved when material bending strength, namely is broken off stave.

4) Impacting

The material is attacked the action of force to break, because its stave strength is the instantaneous action, its stave efficiency high, the reduction ratio big, the energy consumption are few, the impact has the following several kind of situations stave:

① Movement object to material impact; 

② High speed movement material to fixed working surface impact;

③ The high speed movement material attacks mutually; 

④ High speed movement work body to hanging material impact.

5) Grinds (attrition)

After the material and between the movement active face certain pressure and the cutting action of force, its shear stress achieved when material shearing strength limit, the material then crushes, or between material each other rubs when the cutting, the grinding function causes the material to be stave.