Impact Crusher: All You Need to Know

 

What are the benefits of an impact crusher?

Impact crushers reduce mineral materials such as concrete, asphalt and natural rock in size to produce a valuable commodity product. A fast spinning rotor throws the material against a solid stationary impact wall. The striking and impacting causes the material to shatter into smaller pieces. The result is a very homogenous and cubical product leaving the crusher box.

• Versatility

Good for processing reinforced concrete, asphalt, cinder blocks, sand & gravel, soft rock, and hard rock.

• High Reduction Ratio

Ideal for producing a spec product without the need of a primary jaw crusher.

• Superior Material Compaction

Material produced by an impact crusher is easier to grade and compact making it perfect for base and subbase.

Types of Impactors

There are 2 main types impact crushers - horizontal shaft impact (HSI) crushers and vertical shaft impact (VSI) crushers.

• Horizontal Shaft Impactor (HSI)

The horizontal shaft impactors are the most common impactor type that can be used in recycling, primary and secondary crushing applications. This type impactor will take reasonable size pieces and produce small output material.

• Vertical Shaft Impactor (VSI)

Vertical shaft impactors are designed to process already small material even smaller and are therefore used in a tertiary crushing application (e.g. producing manufactured sand).

 

What are the main components?

The crusher box includes a rotor with hammers (also called blow bars). Depending on the rotor style you will have either 3 bars or 4 bars. Hammers are cast iron replaceable wear parts that are actually in contact with the material. They are designed to withstand the many impacts of the material. The impact wall (also called apron) has several crushing stages and is armoured by thick wear plates.

Once the hammer hits the big material entering the crusher box it is thrown against the wall and starts ricocheting between hammers, wall and other material particles. As soon as the material is small enough the fit in between the rotor and the lowest crushing stage of the impact wall it will leave the crusher box at the bottom.

 

What materials can you process?

Impact crushers is a versatile crusher that can be used to process natural rock and recycle materials alike. Many people claim that you can't process hard rock with an impact crusher. This is not entirely true because it depends on the breaking characteristics of the rock and the feed size.

• Concrete & asphalt recycling

Reinforced concrete, demolition material, asphalt millings, washout concrete, high PSI runway concrete, brick & masonry.

• Soft & medium hard rock

Every rock is different even if it is the same type of rock. There is soft limestone and there is hard limestone. Please consult a crushing expert to verify your application.

Slag, railroad ties, glass, ivory, and pre-stressed concrete is also possible but need closer attention. Please consult a crushing specialist.

 

What size material can you produce?

The beauty of impact crushers is their versatility in terms of input material and output size. There are many different designs out there but generally speaking impact crushers can produce material from 3" down. The smaller the input material the harder it gets to crush. The output gradation can be adjusted through various settings.

• Rotor Speed

The higher the speed the more fines are produced.

• Crusher Geometry

Altering the distance between the rotor and the impact wall influences gradation and overall output size.

• Hammer Setup

Common hammer setups are 2 high 2 low or 4 high hammers.

 

Qunfeng provides high-quality impact crusher. If you are interested in our producs, please contact us now!