The size of a jaw crusher is usually described by the gape and the width, expressed as gape × width. The common crusher types, sizes and their performance are summarised in Table 4.1. Currently, the dimensions of the largest Blake type jaw crusher in use are 1600 mm × 2514 mm with motor ratings of 250300 kW.
Nikolov (2002 Nikolov ( , 2004 presented a model for the particle size distribution of material crushed by hammer or VSI crusher, expressed as a function of the crusher rotor radius and angular ...
normal operating speed of industrial crushers, rpm or strokes/min. P: 80% passing size of product, m. P c: calculated power for actual throughput, kW. P d: power drawn, kW. P i: installed power, kW. P m: calculated power for theoretical throughput at operating speed, kW. R: reduction ratio at 80% passing size, F/P. S: close side setting, m. S c ...
be accepted into the crusher is approximately 80% of the gape. Jaw crushers are operated to produce a size reduction ratio between 4:1 and 9:1. Gyratory crushers can produce size reduction ratios over a somewhat larger range of 3:1 to 10:1. The primary operating variable available on a crusher is the set and on jaw and gyratory the open side ...
The ore is to be broken down in a jaw crusher to pass through a 11.5 cm screen. The undersize is scalped before feeding to the jaw crusher. Assuming the maximum feed rate is maintained at 30 t/h and the shapes of feed and product are the same and the crusher set is 10 cm, estimate the size of jaw crusher required and the production rate. Solution
If the ore feed to any gyratory or jaw crusher consisted entirely of large cubes or spheres of a size that would just barely enter the crushing chamber, the crusher could not be expected to produce anything like its normal rated capacity because the upper part of the crusher could not shatter the large pieces enough to keep the rest of the crushing chamber busy.
Crusher manufacturers publish grid charts, particle size cumulative distribution curves, and/or product size distribution tables to help predict the gradation of the crusher product. These charts, curves, and tables give the percentages passing or retained on standard size screens for each given setting of the crusher.
The jaw crushers are available in 4 different sizes: BB 50, BB 100, BB 200 and BB 300. Throughput and final fine ness depend on the crusher type, selected gap width and breaking properties of the sample material. Feed sizes range from 40 mm to 150 mm, depending on the model.