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How To Choose Suitable Crusher
- May 14, 2018 -

There are variety of crushers on the market, what kind of crusher suitable to you? Are you suffering from the inefficiency of your crusher? If you really want to solve these problems and improve the efficiency of crushing equipment, it is necessary to have a comprehensive understanding of the characteristics of crushing materials, the method of crushing materials, the classification of crushing equipment, etc.

During the selection of the crusher , the type , hardness , particle size and yield of the crushed material and the yield and construction site shall be fully taken into consideration .

Types and hardness of materials

The type and hardness of materials are the first factors to be considered in the selection of crushing equipment. Different types of materials will have different hardness and structure, which has the primary limitation on the choice of crushing equipment.

The hardness of material indicates the soft and hard degree of the material and has direct relation with the friability of the material. Usually, the hardness is expressed by Morse hardness, which is divided into 10 grades, the higher the material grade is, the harder the material is, the harder the crushing difficulty is, and the higher the requirement for crushing equipment is. Fragility represents the physical properties of materials that are easily broken. The main factors affecting the fragility are the strength, hardness, density, structure, water content, viscosity, crack, surface condition and shape of the material.

The moisture of the material will also affect the choice of the crusher. When the moisture content is too large, the fine grain material will agglomerate or stick to the coarse grain material because of the increase of humidity, thus increasing the viscosity of the material, reducing the discharging speed and decreasing the productivity. When it is serious, it will even cause the obstruction of ore outlet, which will affect the normal production.

The degree of development of ore's cleavage also directly affects the productivity of the crusher - because the ore is easily broken along the cleavage surface when the ore is broken, thus breaking the developed ores, the productivity of the crusher is much higher than that of the compact structure of the broken structure.

According to the different structure and working principle, the commonly used crusher mainly includes jaw crusher, counterattack crusher, hammer crusher, conical crusher and roller crusher, etc. Each product will be divided into different specifications according to specific production requirements. Although there are many types of crushing machinery, there are different methods of crushing, crushing, crushing, crushing, crushing and grinding. Before choosing the crushing equipment, the customer should first adopt the corresponding method of applying force according to the material property of the grain, the requirement of the crushing product and the grain size, and then determine the type of the crushing equipment. Mainly divided into the following Cases:

1. Large or medium size hard materials are generally crushed, impact crushing, such as jaw crusher, tooth roller crusher and so on.

2. Abrasive materials are generally crushing, the surface of grinding tools is smooth.

3. Weak abrasive materials are crushed by impact, crushing, grinding and grinding tools with sharp teeth.

4. Small size of hard materials generally used crushing, impact crushing, grinding, grinding tool surface teeth, is smooth, such as roll crusher.

5. Ductile materials are generally adopt shearing or rapid impact, such as hammer crusher.

6. Pulverized or muddy materials should use grinding equipment like ball mill.

7. Multi-component materials can be broken by impact, and can be combined with a variety of force fields.

Feed particle size

Feed particle size is used to determine the type and model of crushing equipment.

If the content of coarse particles (the size of the large dry ore outlet) is high or the ratio of the largest ore feeding block to the feed hole width is larger, the crusher needs to achieve a large crushing ratio (the ratio of the particle size of the material before crushing to that of the material after crushing). So the productivity is reduced, the crushing material has more fine grain (close to or less than the size of the ore outlet) or the ratio of the largest ore block to the feed hole width is small, the crushing ratio should be small, so its productivity will be improved accordingly.

If the feed particle size is large and the discharge particle size is small, secondary or multi-stage crushing is often required. If the size of the broken material is small, there is no need for multi-level crushing. Jaw crushers and some hammer crushers are generally used as primary crushers, while impact crushers, cone crushers, roller crushers, and hammer crushers are generally used as secondary crushers or even tertiary crushers.


The yield is also an important index to determine the crushing equipment. The conventional understanding is that the higher the output requirement, the larger the crushing equipment specification, and the higher the input and output will be. At present, the crusher's output is less than 10 tons per hour and hundreds of tons per hour. Customers should choose what equipment to adopt and how to arrange the production line according to their specific requirements.