• Sitemap
• Get Price |
• News |
• Service |
• Contact Us |
• About Us |
• Home |

• Grinding Mill
• Stone Crusher
• Mobile Crusher
• Production Line
• Optional Equipment
• Knowledge
• Download PDF

• + Stone Crusher
  • - Jaw Crusher
  • - JCE European Jaw Crusher
  • - Impact Crusher
  • - Hydraulic Impact Crusher
  • - Hammer Crusher
  • - CS Cone Crusher
  • - Spring Cone Crusher
  • - Hydraulic Cone Crusher
  • - HCS90 Cone Crusher
  • - Sand Making Machine
  • - VSI Crusher
  • - VSI5X Crusher
• + Grinding Mill
  • - Ball Mill
  • - Vertical Mill
  • - Raymond Mill
  • - Super Thin Grinding Mill
  • - High Pressure Grinding Mill
  • - MXB Coarse Powder Mill
  • - MTM Medium Speed Mill
  • - European Grinding Mill
• + Optional Equipment
  • Vibrating Feeder
  • Vibrating Screen
  • Belt Conveyor
  • Sand Washer

Konwledge Center >> Now Location: primary crusher

• The tips to select the primary crusher

• Generally speaking, the jaw crusher and impact crusher are used as primary crusher more. The term "primary crusher", by definition, might including any type and size of crushing machine.
  
  The term implies that at least two stages of crushing are involved, but in many cases the machine which performs the function of initial crusher is the only crusher in the plant.
  
  The factors influencing the selection of a crusher for this service are much the same, regardless of how many crushing stages there are in the flowsheet; therefore, the term "primary crusher", by common usage, is applied to the crusher which takes up the job of reduction where the blasting operations leave off.
  
  Selecting the right type and size of primary crusher is a problem of prime importance in the designing of a crushing plant of any nature and size. Usually this machine is the largest and most expensive single item of equipment in the plant; a mistake in the choice can only be remedied fully by replacement; and, because the entire primary crusher house arrangement is generally "tailored" to fit the crusher, such replacement is almost always a costly procedure. While personal favoritism toward some particular type of crusher may safely be allowed to swing a close decision, it should never blind the engineer or operator to the merits of other types, nor to the limitations of his favorite.
  
  The following factors all have a more or less important bearing upon the choice of the primary crusher.
  1. The name, hardness,humidity of material
  2. The hourly, daily or yearly capacity are required
  3. The final product size or discharging size
  4. Type and size of quarry equipment
  5. Method of feeding the crusher.
  
  The first three of these factors will almost always be ascertainable at least to a close approximation before the matter of crusher choice is taken up. Sometimes, as when a new crushing plant, 01' a new primary crusher set-up, is to be installed at an existing operation the last three factors will be pre-established. Otherwise, it is sound practice to consider them as a part of the problem of crusher selection. The primary crushing setup is closely linked to the quarrying or mining operation, and it is only by careful adjustment of all equipment selections to the general plan of operation that optimum operating results may be realized.
  
  While it is convenient to discuss the influence of these several factors separately, it is well to keep in mind that they are more or less closely interlocked, and that a change in one of them may necessitate altering one or more of the others.
  
  In addition to the factors listed there are usually a few which are peculiar to each individual problem such as labor costs and so on. Any plant design problem is an economic as well as an engineering one. We are concerned he re chiefly with the engineering phases.
• Crushed stone (aggregates): Primary crushing
• Trucks with a capacity of up to 50 tons haul rock from where it is blasted and loaded by hydraulic shovels to the primary crusher. For scale note man in the window of the control room (left).
  
  Rocks up to 5 feet by 4 feet by 4 feet in size enter the primary crusher which reduces the size to 12 inches or smaller. Water is sprayed to reduce dust. Water is conserved and recycled in the mining and washing operations.
  
  The primary crusher in this quarry was initially located on the surface. As the quarry was deepened, the primary crusher was relocated to the bottom of the quarry to minimize noise.
  
  The yellow device (left and below) is used to reduce the size of oversize rock so that it will enter the primary crusher. The yellow devise is also used to open 'rock jams' in the bin above the narrow opening to the primary crusher. A detail view of rock entering the primary crusher is shown below.
  
  The primary crusher crushes more than 1.5 million tons of stone per year. This is enough crushed stone to make 60 miles of road or 5,000 homes. The primary crusher and related equipment cost several million dollars.
• Crusher and Mill PDF Free Download