Vertical Shaft Impactor

Vertical Shaft Impactor

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Vertical Shaft Impactor

Vertical Shaft Impactor engineered from acrylic is manufactured according to the specifications provided by the clients. These machines are highly strong, provide efficient functionality and are highly compatible. Vertical Shaft Impactor machines are tested for quality by our dependable venders and solely appreciated by the clients. Vertical Shaft Impactor may be obtained in varied sizes and models to match the particular needs of the clients. They are appreciated for their longer functional life, easier operation and robust construction.

How Vertical Shaft Impactor Works?

VSI is no more than Centrifugal "STONE-PUMP". Stones are fed into rotor center (such as water in the centrifugal pump) & stones are thrown outwards towards the boundary by outward-developing force.

Feed material is fed through a vertical tube in the midway of the horizontal rotor revolving at high speed (60 M/Sec to 70 M/Sec) around an axis in vertical motion. Feed material owing to the centrifugal force starts gaining speed and it acquiring distributed over the cone of the distribution and as the material travels over the vanes of the rotor, towards the periphery matches the same as the speed of the periphery of rotor. At the instant of rotor alighting, material achieves a velocity which is the sub-sequence of radial velocity and peripheral velocity (owing to centrifugal force) and resultant velocity direction is almost 45 degrees to radial direction.

These feed particles have so high kinetic energy that after impact, against the stresses of breaking surfaces generated within the particles overshoot their optimum strengths and hence particles disintegrate into different number of pieces giving rise to fresh surfaces.

It is the velocity and only the velocity which decides the Fragmentation amount.

Hence, VSI is in true sense a purity defines Impact Crusher which crushes only by the way of Impact. Not like other traditional Impact Crushers, where shear, attrition, compression and impact allocations, play the part in material crushing.

There is no gap setting in VSI. Crushed material falls outside of the annular open ring area by the way of gravitational force.

ECOMAN manufactures both types of VSIs

  • Stone on Stone type: Rotor is designed in a manner that, stone layer gets settled on the vane and surface is also developed by material built up. Thereby minimizing the deterioration on the vanes & also on walls' breaker. But this cushioned surfaces, minimize a considerable crushing amount and the spare consumption amount is also minimized.
  • Stone on Steel type: In this category of VSI, after getting discharged from the rotor, the material slides on the metallic steel vanes and hits on the surfaces of metallic steel. By nature wear on, breaker surfaces and vane surfaces is high. Larger feed sizes up to 100 to 150 are possible. Ratio to reduction is also high.

Points to Remember

There should be a clear under standing that Stone-on-Stone V.S.I is mainly a "Shaping Machine" and not a harsh heavy reduction machine for crushing. Heavy size reduction has been avoided by intention in Stone-On-Stone V.S.I, by offering a "Soft Cushioned Impact", so that, material is not minimized to ideal product size at one go, but it achieves the desired size of product, only after  three to four passes or more, This has been done by intention.

Hence, quite a high recirculating load was needed. And that is how cubical shape attained by nine stone-stone type V.S.I, is very much advanced to cubical shape received by any other present I crushing equipments.

So, capacities of throughput are extremely high and should not be confounded with the ultimate capacities of product output. Invariably throughput capacity needs to be 1.5 to 5 times of output capacities. For example, sand manufacturing V.S.I having output capacity of 20 TPH, should have a say of 100 TPH capacity of throughput.

Hence, capacities of recirculating equipments and feeding equipments should be dependent on throughput capacities and not on capacities of output.

Making sure that no over sized material is fed to V.S.I, is very important. Even occasional, two pieces or one piece can be harmful, as these pieces may choke up in the tube of feed or block the rotor passage. Rotor will become out of balance and if continued to operate further may get damage to the bearings. Therefore, pre-screening before feeding into V.S.I, is very necessary. Even papers, cardboard pieces, cotton waste and clay lumps, etc., may block the passages. Upper limit of feed size, which is maximum feed size should be controlled in a very strict manner.

Continuous feeding, without disruption at rated throughput capacity provides the best results. It enhances shape and outputs of aggregates, gets improved further.

Surface velocity of the rotor determines the ratio of reduction. For finer end product, higher speeds are needed. For standard aggregates, 45 m/sec is optimum speed but for better products higher speeds even up to 70 m/sec to 80 m/sec are utilized.

It is highly advisable and advantageous to make provisions in the circuits of crushing, in a manner that all the detached sizes in needed proportion you should be able to convey back to V.S.I, in order to improve shape further and to attain desired analysis of grain in the product. (You could say to attain desired F.M.).

As the material is all the time flowing over the bed of material and impacting also impacting on the built-up of material, wear & tear on the components is minimized & hence per ton spare parts consumption entire production is very low; most commonly when compared with traditional impactors.

In case of large size V.S.I.s, selection of twin motor drive could be done. One motor will carry the V.S.I to full speed, and then the other motor is brought into working. Thereby, considerable reduction of the starting heavy currents is achieved. This arrangement is highly useful particularly when plant is functioning on D.G. Set.

Crusher Dimensions in mm

35 1630 900 791 300/594 1104 1600 3400
55 1866 1643 798 500 1690 2600 4550
80 1866 1643 798 500 1690 2600 4550
110/160 2484 1659 978.5 -0 -0 2800 4170
220/330 3005 2439 1178 606 2006 -0 -0


Crusher data

TYPE 35 55 80 110 160 220 330
Max. Feed size 0-30 0-35 0-35 0-40 0-40 0-50 0-50
Diameter in mm 610 780 780 1000 1000 1200 1200
Surface speed m/sec 30-62 45-65 45-65 45-65 45-65 35-55 35-55
RPM 1300-2000 1320-2000 1320-2000 1030-1670 1030-1490 640-990 640-990
Power in KW 55 75 90 160 200 250 300
V-Belts 4xXPB 5xSPC 6xSPC 6xSPC 6xSPC 8xSPC 8xSPC
Wt. in Kgs. approx 2800 3200 3800 5800 6000 6900 7000
Motor Pulley 236 250 265 4000 400 540 540


Production Capacities (depend on material & feed size, approx valuse)  

Type Through Put Product Through Put
0-2 mm 0-4 mm
35 40 tph 8-12 tph 15-20 tph
55 70 tph 12-16 tph 20-25 tph
80 90 tph 16-24 tph 23-30 tph
110 130 tph 25-30 tph 35-40 tph
160 160 tph 30-40 tph 50-70 tph
220 220 tph 50-70 tph 70-90 tph
330 280 tph 70-90 tph 110-130 tph

Closed Rotor (Welded Construction)

  • Hard facing (Rebuilding)
  • Main Body
  • Material Build up
  • Wear Components

Open Rotor  (Bolted Construction)

  • Main Body
  • Wear Components


Tips life with different application.

Product - 0-4

Mineral Hre Apprx.
Mineral with 15%Quartz 1500-1300
Mineral with 60-90% Quartz 500-1500
Klinker 4000-8000
Granite/Basalt 1000-7000
Limestone 4000-12000
Corundum 250-500
Blast Furnace Slog 3000-4000
Bauxite 500-1000

Above Non-binding values differentiate considerably.