VSI crusher is an advanced and high efficient crusher used for the shaping of metallic, non-metallic ores and building materials. Further, it is very helpful for making all kinds of metallurgical slag. This crushing machine is applicable to the material with hardness less than level 9. Further, it is not appropriate for viscous materials such as stone with too much soil.
This article gives you a complete overview of the VSI crusher. Further, you will learn the complete working of VSI crusher and VSI crusher parts in-details. Let’s get started…
What is VSI Crusher?
The vertical shaft impactor is a type of impact crushers that offers higher reduction ratios at lower energy consumption. You can consider them as a stone pump that operates like a centrifugal pump.
There are plenty of VSIs are available in the market such as Sandvik’s CV series and Barmac B Series. These crushing machines use the rock on the rock crushing principle for size reduction. The size reduction results in cost reduction.
The main objective of this machine is to provide high-quality sand aggregate for high-speed railways, municipal buildings, high-rise buildings, and hydropower dam construction. VSI crushers are designed for tertiary crushing.
Different VSI Crusher Parts and Working
Here are some important VSI crusher parts with the functionality:
- Feed Hopper:It is a part where the feed materials fall in the vertical crusher impactor crusher. Plus, it is basically a rock-lined hexagonal feed hopper.
- Rotor Throttle Gate:It is a hydraulically operated gate that controls the feed rate of rotor material.
- Hurricane Rotor:The feed material falls into the feed tube by gravity that subsequently feeds the hurricane rotor.
- Rock-lined Hurricane rotor:The VSI crusher uses this rotor to accelerate the feed material. Basically, the centrifugal force plays a key role to accelerate the material at the speed of 45 to 62 m/s.
- Crushing Chamber:This chamber is lined with a solid layer of material that energized rotor material impacts. It is considered high-velocity autogenous impaction that causes cleavage and attrition of the feed material.
- Enclosed Metal Rotor Shoe:It is a top plate that enclosed the top of the rotor and prevents material from escaping from the rotor’s top. It is very helpful in the case of an overfed open-top rotor.
- Tubular Metal Rotor Shoe:The tubular rotor increases the tip-speed that increases the first feed particle with tighter particle size distribution. In addition to this, it reduces recirculation loads.
- Open Top metal Rotor Shoe:It is very good for a large feed. Plus, it is an incredible rotor for medium to very hard material. However, the open-top metal rotor works best for softer materials. This rotor can deal with abrasive, dry, or wet materials but it doesn’t work well with the sticky materials. In this rotor, high reduction ratios are common that are very helpful for gravel and sand production in the closed system.
- Crushing Chamber:As the name suggests, this is a crushing chamber that crushes everything it receives. Then, this crushing action conveys extremely high energy to the material for crushing purposes. And, this energy is very effective for the majority of the objects. As a result, you will receive a very consistent and uniform grade of material.
- Discharge Chute:After producing the high-quality sand aggregate, discharge chute receives it.
VSI crushers have the ability to handle hard, fine, sticky, abrasive, and moist feed materials. These characteristics make it one of the suitable crushers for different applications like quarries and gravel plants. Many firms use it for recycling such as processing glass bottles and cement works.
Feeding Methods of VSI Crushers
Below are the two most popular feeding methods for VSI crushing machines:
- Center Feed
The majority of the VSIs receive the feeding material from above into the center of the rotor. After feeding it through the center of the rotor, the material is reached to the crushing chamber. Then, the crushing chamber impacts the outer anvil ring. This crushing action generates extremely high energy to break the material for crushing purposes. And, this energy is very effective for breaking the majority of the objects. As a result, you will receive a very consistent and uniform grade of material.
- Cascade Feeding
In this method, feeding material enters the crushing chamber from above directly by bypassing the rotor. This method is called cascade feeding because the material fills up a large feed bowl. Then, it spills over the side and falls into the crushing chamber from above without involving the rotor. The effect of increasing feed through cascade has a striking resemblance to slowing the rotor. Furthermore, cascade feeding might not affect the particle size distribution of quality if its amount is up to 10%.
Main Applications of VSI
Its major limestone applications include gravel, sand, road base, and cement. Besides, its industrial uses include Ferrosilicon, glass, cordite, corundum, silicon carbide, zeolite, and tungsten. The mining applications for VSI crushers are burnt magnesite, non-ferrous metal ore, trona sulfate, perlite, bauxite, iron ore. These crushing machines are very helpful for everything range from waste to abrasive materials and recycling applications.
VSI Crushing Method
VSI crushers are famous for making coarse, sand, and medium aggregates for asphalt/ concrete production. The feed size varies depends on the machines that range from 5 to 12 inches. Therefore, the suitable sized material is provided into the center of an open or closed rotor. It can be either center or cascade feeding.
Then, the rotor starts rotating at very high rpm and throw the feed with high energy into the crushing chamber. When the thrown material hits the anvil ring assembly, it shatters. After this, the cubical shaped products fall through the opening between the anvil, rotor, and to the conveyor below.
The speed of the rotor decides the size of the final particle. If you speed up the rotor, it will produce more fines. Similarly, if you slow down the rotor, it will produce fewer fines. You can adjust the speed of the rotor based on the feeding material.