What is Vertical Impact Crusher?

The VSI crusher, consists of a rotor with a shaft in vertical arrangement. The material enters the interior of the rotor, and when it rotates at high speed, it projects the material towards the exterior where the anvils or impact screens are located. There is a variant in which the material thrown hits an impact chamber filled with the same material to be crushed. Constitute the crushing stone against stone.

Vertical Impact Crusher

Vertical Impact Crusher Design Advantages:

(1) Design of the impellers reduces the resistance of materials, high lighten passing through quantity of materials and crushing ratio, so the efficiency is raised by 30%~60%.

(2) Hydraulic system allows automatic uncovering, which reduces labor intense and makes maintenance easier.

(3) The mainframe strengthens the machine structure and ensures stable performance.

(4) VSI crusher employs light oil anti-leakage device. This saves the trouble of changing the oil seal.


Vertical Impact Crusher Factors Influence on Capacity

(1) Number of runners

The diameter of the rotor and the particle size of the feed determine the number of flow channels, z=πD/k1.k2.d, D is the diameter of the rotor (m), k1 is the filling factor, k2 is the correction factor, and d is the actual feed size (m). The number of runner plates determines the number of outlets, and the difference in the number of outlets will affect the vortex changes.

(2) Installation angle of runner plate

The installation angle of the runner plate ranges from 36 to 52 degrees.

(3) Main shaft rotating speed

The higher the rotor speed, the higher the material crushing ratio will be, but it will also cause aggravation of wear and influence on the severity of vortex, so a more suitable rotor speed must be determined. However, the speed of the rotor is not the main factor that determines the speed of the thrown particles, and the high speed of the rotor does not guarantee that the thrown particles have a high speed. The speed of the rotor can be calculated as follows: n=60v/πD, and the rotor cutting speed v is generally 50~85m/s.

(4) Feeding amount

The processing capacity of vertical shaft impact crushing is related to motor power, rotor speed and size, shunt ratio and material flow, among which motor power plays a major role.

Suppose the relationship among the feed amount Q (t/h), motor power P (kw), and energy consumption q (kw.h/t) is as follows: P=qQ

According to the known size D and rotor speed n, q=1~2.5kw.h/t (rotor feed) and q=0.67~0.75kw.h/t (overflow feed) determines q, which are in the basic parameter table of the impact sand making machine specified by the national building materials industry standard .

Vertical Impact Crusher Working Principle:

The VSI is typically used after a primary or secondary crusher. This makes a VSI ideal for making sand and for making coarse and medium aggregates for concrete/asphalt production.

Feed size and characteristics will affect the application of a VSI. The feed size is limited by the opening in the center of the rotor. Normally less than 5-inch material is desired, but very large VSIs can handle up to 12-inch feed. Another feature that will affect application is moisture, which can make the feed sticky. Required production capacity is the final limiting criteria. Large primary horizontal shaft impactors can output up to 1600 TPH and more. 1000 TPH is about the maximum for a VSI because of the limiting motor size and the rising G-force of a high-speed rotor, which is calculated by multiplying the radius times the square of the RPM.

Shoe configurations are many: rock on rock, groups of rollers, special tip wear parts and many others. The metallurgy of the shoes is also highly varied. Rotors can have three to six shoes. The number of shoes is typically governed by the diameter of the rotor. The larger the diameter rotor, the more openings are possible. Computational Fluid Dynamics (CFD) mathematical models are utilized to simulate the flow and collision forces to reveal solutions for lower wear cost, consistent final product, and higher energy efficiency.

The material to be crushed is fed into the center of an open or closed rotor. The rotor rotates at high rpm, accelerating the feed and throwing it with high energy into the crushing chamber. When the material hits the anvil ring assembly, it shatters, and then the cubical shaped product falls through the opening between the rotor and the anvil and down to the conveyor below.

Vertical Impact Crusher Technical Parameters:

Capacity(t/h)Feed at center and side120-180200-260300-380450-520
Feed at center60-90100-130150-190225-260
Max. Inlet size(mm)Soft material<35<40<45<50
Hard material<30<35<40<45
Rotation speed(r/min)1700-18901520-16901360-15101180-1310
Dual-motor power(kw)110180264400
Dimension L*W*H(mm)3700*2150 *21004140*2280 *24254560*2447 *27785000*2700 *3300
Capacity(t/h)Feed at center and side150-280240-380350-540500-640
Feed at center70-140120-200180-280250-360
Max. Inlet size(mm)Soft material<35<40<45<50
Hard material<30<35<40<45
Rotation speed(r/min)1700-19001500-17001300-15101100-1310
Dual-motor power(kw)110-150180-220260-320400-440
Dimension L*W*H(mm)4100*2330 *23004140*2500 *27004560*2600 *29005100*2790 *3320