Stone production line, a stone crushing and sand making process composed of primary crusher and secondary crusher. Crushing operations often divide into coarse crushing, medium crushing and fine crushing according to the size of feeding and discharging granularity. Commonly used crushing equipment includes jaw crusher, cone crusher, impact crusher, hammer crusher, etc. Different equipment has different application. This article introduces the common equipment for primary crusher and secondary crusher.
Factors to be considered when choosing crusher
Different types of materials have different hardness. In general, the greater the hardness, the higher the crushing difficulty coefficient. For crushing hard or medium-hard stone materials, jaw crushing equipment should select as the primary crusher machine. When crushing medium-hard or soft stones, cone, counter-attack or hammer crushers could apply directly.
If the size of the material is large, a jaw crusher can apply as the primary crusher for sale; when the size of the material is small and the customer needs different specifications of the stone, the combined crushing equipment should select as the secondary crusher machine. Such as a primary crusher and secondary crusher combined crushing equipment consisting of a jaw crusher and a cone or impact, hammer crusher. There are many primary crusher types and secondary crusher types.
Jaw crusher as primary crusher and secondary crusher
Jaw crusher is the first choice of crushing equipment. It generally serve as coarse and medium crushing of hard and medium-hard rocks, and crushing various materials with compressive strength not exceeding 320MPa. Therefore, it is usually used as primary crusher.
Primary jaw crusher has the characteristics of large crushing ratio, uniform product size, simple structure, reliable work, easy maintenance, and economical operating costs. Therefore, it has a widely application in many sectors such as mining, smelting, building materials, highways, railways, water conservancy and chemical industries.
Primary jaw crusher uses the squeezing and bending action of the two jaw plates to complete the work. The crushing structure consists of a fixed jaw plate and a movable jaw plate. When the two jaws are close, the material is broken. And when the two jaws leave, the material blocks smaller than the discharge opening discharge from the bottom.
Jaw crusher often applies as a primary crusher, but also as a secondary jaw crusher application. It could divide into PE series jaw crusher and PEX series jaw crusher. PE series jaw crusher applies to primary crusher mining because it is more properly useful on coarse crushing. We usually choose PEX series jaw crusher when we need crushing medium materials.
|Model||Max. opening size (mm)||Max. feeding size (mm)||Output range (mm)||Capacity (t/h)||Power (kw)||Weight (t)||Overall dimension (mm)|
Hammer crusher is mainly applicable to stone crushing in the building materials industry, highway and railway construction, and other industries that use stone materials. It is suitable for crushing various hard and medium materials, such as limestone, gypsum, bricks, slag, coal gangue, salt, chalk and other materials. Hammer crusher can directly crush materials with a large particle size of 750-1500mm to about 20mm.
The hammer crusher has a mainly application in the industrial first-level crusher. It could form at one time without the need for secondary crushing and shaping process. Therefore, in small and medium-sized production lines, it is often broken with a hammer alone.
Compared with jaw crusher, both of them are suitable for crushing coarse and medium materials. And the hammer crusher mostly serve in cement production lines. It can be used as a primary crusher device for limestone raw materials. And it can also serve as a primary crusher and secondary crusher device in a sand-gravel co-production project.
Cone crusher machine
Cone crusher is a secondary crusher widely used in sand and gravel yards. It is especially suitable in the hard rock crushing production line for secondary crusher for sale. Its different specifications and different cavity shapes of the same specification can meet the requirements of various processing conditions. What’s more, it can better meet the needs of different customers. Moreover, it runs smoothly, has a long service life of wearing parts, and has a large processing capacity, which is conducive to the operation of the entire production line.
The cone crusher uses the gyrating motion of the crushing cone in the cone cavity. Then it produces squeezing, splitting and bending effects on the material, thereby crushing various rocks. It is often suitable for medium or fine crushing operations.
Cone crushers have many different models, including hydraulic cone crushers, spring cone crushers, single-cylinder cone crushers, compound cone crushers, etc. It has a good crushing effect as the secondary crusher mining on hard stones.
|Model||Cavity Type||Stroke（mm）||Max. Feeding Size(mm)||Discharging Opening Adjusted Scope(mm)||Capacity(t/h)||Motor Power(kw)||Weight(t)|
Impact crusher machine
The impact crusher is a primary crusher and secondary crusher machine that uses impact power to crush materials. We can adjust the gap between the impact plate and the rotor, then the purpose of changing the particle size and shape of the material could achieved. It is mainly suitable for the crushing operation of various coarse, medium and fine materials whose feed size is less than 500mm and the compressive strength does not exceed 350MPa.
Primary impact crusher and secondary impact crusher have the advantage of small volume, simple structure, large crushing ratio and even up to 40 mostly. It has large production capacity and high output. The product has uniform particle size and can selectively crush stones.
Secondary impact crusher is particularly effective for soft rock crushing. This is because if its parts crush hard rock (such as granite), as a secondary crusher device, the parts need frequently replace. This is not conducive to saving money. And also not conducive to the good progress of the entire sand and gravel crushing production line.
|Model||Specification||Feed opening size (mm)||Feeding size (mm)||Capacity (t/h)||Power (kw)||Overall dimension (mm)|
Daswell primary crusher and secondary crusher
The above is the common primary crusher and secondary crusher in the crushing production line. In general, for the selection of primary crusher and secondary crusher equipment in the stone production line, the scales of the two must combine with each other before the selection. And the front and back production capacities must also match. It is important to choose according to the customer’s material specifications, output, and usage. These need to make plan by professionals according to your actual situation.
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