Although the hammer crusher and impact crusher are somewhat similar in appearance, they are quite different. How to choose between the two? This article will compare them from the scope of processing materials, structure, price, output, etc.
Impact crusher vs hammer crusher
1. Different scope of processing materials
|Types||Impact crusher||Hammer crusher|
|Material hardness||Medium hardness, especially good at processing ore with low toughness and high brittleness||Medium hardness (limestone, gypsum, slag, coal, etc.)|
|Compressive strength of materials||≤ 350 MPa||≤ 200 MPa|
|Feeding size||≤ 500 mm||≤ 1200 mm|
|Material with high moisture content||Applicable||Unapplicable|
2. Different crushing cavities
Impact crusher: It has a relatively large crushing cavity, so the material is not only impacted by the hammer, but also repeated impacts between the material and the impact plate, and between the material themselves.
Advantage: This kind of crushing is more sufficient and the bulk material can be better processed through it.
Different crushing cavities of impact rock crusher and hammer crusher
Hammer crusehr: The crushing cavity of the hammer crusher is relatively small with good sealing performance.
Advantage: When processing materials, it can effectively solve the problems of dust pollution in the crushing space and dust leakage from the machine body.
3. Different direction of plate hammer/hammer head
Impact crusher: In the interior of the impact crusher, the plate hammer moves from the bottom to the top to crush the material, and then throws the material onto the upper impact plate.
Hammer crusher: It strikes and crushes the material in the direction in which it falls.
Plate hammer of impact crusher and hammerhead of hammer crusher
That is, the rotor operates clockwise inside the impact crusher, while in the interior of the hammer crusher, the rotor operates counterclockwise. The hammer head strikes along the direction in which the material falls.
4. Different wear of wearing parts
Whether for the impact crusher or hammer crusher, the plate hammer and hammer head are the main wear parts.
Impact crusher: The wear of the plate hammer mainly occurs on the side facing the material, and the metal utilization rate of the plate hammer can reach 45%-48%.
When crushing limestone, the plate hammer of the impact crusher is not badly worn, but when crushing granite (high hardness), it needs to be replaced constantly.
Different working processes of impact crusher vs hammer crusher
Hammer crusher: Due to the overhanging state of the hammer head of hammer crushers, the wear occurs on the upper, front, back and side. Compared with the plate hammer, the hammer head is more seriously worn with the metal utilization rate about 35%, and the rotary body itself may also be worn.
Besides, if the sieve plate at the bottom of the hammer crusher is severely worn, all the grid must be replaced, which is also more complicated.
5. Different rotor links
Impact crusher: The plate hammer and the rotor are rigidly linked inside the impact crusher, that is, the plate hammer is fixedly installed on the rotor. It can make full use of the inertia of the entire rotor with great speed and kinetic energy to impact the material during crushing.
Hammer crusher: The hammer head of the hammer crusher crushes the material individually (the hammer head is hanging), so it has limited speed and kinetic energy.
6. Different ways of discharging adjustment
Both of these crushing equipment can adjust the particle size of the finished product.
Impact crusher: There is no screen grate at the bottom of the impact crusher, so the adjustment of the product particle size is mainly controlled by adjusting the rotor speed or rotor diameter, the opening size of the distributor and the gap of the grinding chamber.
The structure of impact stone crusher
Hammer crusher: The final grain size of the hammer crusher can be controlled by adjusting the screen gap of the sieve plate.
The structure of hammer stone crusher
7. Different grain shapes
Impact crusher: The finished product of the impact crusher has a good grain shape. The discharging material is cubic with a uniform particle size as well as low fine powder and dust.
Therefore, in situations where cubic particles are needed, for example, the anti-skid pavement of high-grade highway, the impact crusher can be used as the crushing equipment to produce concrete aggregates.
Different grain shapes of impact crusher and hammer crusher
Hammer crusher: The hammer crusher has a relatively large reduction ratio, generally 10-25, even 50. However, its finished products contain more needles and flake materials and powder.
8. Different output
Although the grain shape of the impact crusher is more rounded after 2-3 shaping processes, multiple impacts seriously affect the yields.
Generally speaking, the output of the same type of impact crusher is only 1/3 of that of the hammer crusher.
9. Different prices
Impact crusher: The market reference price of the PF series impact crusher is $10,000-120,000 and the CI series impact crusher is $26,000-238,000.
The impact crusher is generally used as secondary crushing equipment, so the coarse crushing, fine crushing and other equipment are also needed in the production process.
Prices of CI series impact crusher vs heavy hammer crusher
Hammer crusher: There are many models of hammer crushers, with prices ranging from several thousand to one hundred thousand dollars.
The crushing granularity of the heavy hammer crusher is larger, and the reference price is about $5,000-180,000. The heavy hammer crusher can form a single production line to simplify the crushing process.
10. Material blockage phenomenon
Impact crusher: Relatively speaking, the material is not prone to be clogging in the impact crusher. Firstly, it can be equipped with a heating device to prevent the material from blocked due to adhesion.
Secondly, there is no grate at the bottom of the impact crusher. The product size is determined by the gap between the impact plate and the plate hammer. Therefore, it can be used to handle materials with excessive water content to avoid blocking the grate.
Hammer crusher: The hammer crusher is equipped with a bottom sieve plate, which increases the possibility of material blockage.
11. Equipment maintenance
Impact crusher: Only 6 plate hammers are installed on the rotor of the impact crusher. It is convenient to replace the plate hammers with special tools.
It only takes one shift to replace a set of plate hammers and the replacement of the grinding rod in the bottom grinding chamber takes only a few minutes, which greatly reduces the time and cost of overhaul and maintenance.
Impact crusher and hamemr crusher working on site
Hammer crusher: There are more than 100 hammer heads in the hammer crusher. It takes a lot of time and manpower to replace one set of hammerheads, and the cost of overhaul and maintenance is high. The replacement of the bottom screen is also extremely troublesome.
How to choose between the impact crusher and hammer crusher? Which one is better, hammer crusher or impact crusher? Customers should choose according to the actual production situation.
|Types||Impact crusher||Hammer crusher|
High requirement for
finished product grain shape
|High demand on output||/||√|
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