What is vertical shaft impact crusher? - LinkedIn

A vertical shaft impact crusher (VSI crusher) is a type of tertiary crusher used in the production of high-quality aggregates for various construction applications. It is commonly known as a sand making machine or a shaping machine, as it is primarily used for shaping and sand production.

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The VSI crusher operates on the principle of rock-on-rock or rock-on-steel crushing, where rocks or other materials are fed into a vertical rotor that rotates at high speed. The rotor accelerates the material and throws it against stationary anvils or rock-lined walls, crushing it into smaller fragments.

The main advantage of a VSI crusher is its ability to produce cubical-shaped end products, which are highly desirable in many construction and industrial applications. The high-speed rotor and the crushing chamber design ensure that the material is efficiently crushed, resulting in better particle shape and improved gradation.

VSI crushers are commonly used in the production of sand, manufactured sand, and fine aggregate for asphalt and concrete production. They are also utilized in the mining industry to produce high-quality ores for further processing. Additionally, VSI crushers can be used in recycling applications to process construction and demolition waste into usable materials.

Rotor bodyX

There are different rotor body styles. Most common are 3-bar and 4-bar rotors. This example is a 4-bar rotor that can be operated in the following two operation modes:

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1. 4 high bars: this mode is for processing small materials (e.g. asphalt millings or gravel) or in a secondary crushing application (e.g. after a jaw crusher)
2. 2 high & 2 low bars: this mode is a multi-purpose setup which is ideal for  primary crushing and recycling applications.

Inlet openingX

The inlet opening defines the overall feed-size. As a rule of thumb it is recommended that the maximum feed size is 80% of the inlet opening width.

A chain curtain prevents rocks being ricocheting back ensuring operator safety.

Impact wall or apronX

The impact wall is typically hinged and can be adjusted hydraulically. The apron is typically armored with replacedable impact plates. Some crusher types need to replace the entire impact wall once it is worn out.

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.