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At REMco, we have been in the crusher business for over 40 years and here are some answers to common questions about VSI crushers that we receive regularly from a wide variety of interested parties.
If you have additional questions that you would like answered, contact REMco.
What is a VSI crusher?
A VSI crusher is a vertical shaft impactor. It is a crushing machine that uses velocity and impact to reduce the size of minerals fed to it to a smaller size.
Is there more than one type of VSI?
Yes, there are three basic types. Autogenous, semi-autogenous and standard. Autogenous VSI units use a rock lined rotor and a rock lined chamber; semi-autogenous use a rock lined rotor and a crushing chamber with anvils; a standard VSI uses a rotating impeller with iron wear shoes and a chamber with anvils. Within these three basic machines, REMco offers over 30 standard configurations to meet specific product requirements.
Compared to cone crushers, are VSIs more expensive to operate?
When properly applied and operated, VSI crushers can produce crushed materials at the same or less wear cost per net ton of product as a cone crusher.
Can VSI crushers make the same products as a cone crusher?
Yes! VSI crushers can produce the same products as a cone crusher. Closed circuit operation is preferred when the VSI is operated in a 3rd or 4th stage application. One of the major benefits of a VSI when compared to a cone crusher is the shape of the finished particle which is typically more cubical and uniform when compared to a cone crusher product.
Is the product grading affected by wear of the rotor parts?
No. The REMco rock-on-rock VSI’s product grading is affected by power demand for the feed load, feed grading and rotor speed. The grading remains constant regardless of wear parts condition. For REMco ST/AR machines with anvils, wear of the crushing parts will coarsen the discharge grading.
How often will the REMco VSI need to be serviced?
It is recommended that a visual inspection be made on a regular daily basis. Actual service intervals will be determined by the nature of the application, tonnage and abrasiveness, etc. and quality and regularity of maintenance.
Is the REMco VSI noisy in operation?
The REMco VSI is not a noisy crusher. Sound levels during normal operation range from 70dB to 80dB at a point 1 meter from the machine. The rock lining within the chamber is a very effective sound insulator. Often, the electric motor and surrounding machinery are noisier. Noise levels will vary with installation.
Does the REMco VSI vibrate when in normal operation?
If the REMco VSI rotor is in proper balance, vibration is nil or often non-existent. However, some vibration during the crushing process is normal. Coarser feeds result in more noticeable vibration. Finer feeds tend to result in smoother crusher operation. Pulsing of the vibration level is normal as the rotor builds and sheds different size rock pieces.
Is the REMco VSI dusty in operation?
The REMco VSI is fitted with an air re-circulation system designed to reduce the air pressure build-up within the machine. Under normal operating conditions, this recycles the air which enters with the feed material, lowering the emission of dust below the machine. If the feed material is very dry or extremely fine crushing is desired, and any objectionable dusting appears, it is suggested that a water fogging nozzle be added in the feeding area.
Can the REMco VSI be installed on an existing or rigid support structure?
Yes, REMco VSI crushers may be installed on a wide variety of support systems. The vibration isolators protect not only the crusher but also anything on which it is mounted from most vibrational loads. Many are installed on old existing crusher footings of fabricated construction or concrete. REMco offers a low cost installation kit, if required.
What is the feed size that REMco VSIs can accept?
The larger models of REMco units (4080 series and 9150 series) can accept feed sizes up to 4” / 100 mm. The medium size units (3040 series) can accept feed sizes to 3” / 75 mm and the smaller machines below 200 hp are limited to 2” / 50 mm or smaller.
Can a REMco VSI be used to improve product shape?
All REMco VSIs provide excellent shaping of all materials crushed. In some applications, by operating the machine at a low speed, a dry scrubbing action can be achieved to remove soft, undesirable particles and also to shape sharp angular material produced by compression crushers.
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Common VSI Questions 
