The future of VSI

Simplified

Quelle/Source: Hans van der Zanden

1 Compression crushing with longitudinal breakage pattern

Quelle/Source: Hans van der Zanden

2 Impact loading with mosaic breakage pattern

Quelle/Source: Hans van der Zanden

3 Selective crushing

Quelle/Source: Hans van der Zanden

4 Shoe and Anvil – a very difficult combination

Quelle/Source: Hans van der Zanden

5 Shoe exchange is dangerous and is the cause of much injury

Quelle/Source: Hans van der Zanden

6 Lock pins get often stuck, further complicating exchange

Quelle/Source: Hans van der Zanden

Quelle/Source: University of Leeds/UK

7 Recommended manual handling weight

Quelle/Source: University of Leeds/UK

Quelle/Source: Hans van der Zanden

8 Tango with two radially arranged sliding block parts

Quelle/Source: Hans van der Zanden

9 Tango rotor assembly

Quelle/Source: Hans van der Zanden

10 Tango-Rotor - Klemmenbefestigung der Gleitstückteile

Quelle/Source: Hans van der Zanden

11 Tango rotor – centrifugal locking sliding block parts

Quelle/Source: Hans van der Zanden

12 Permanent Tango rotor blade avoiding the need for rotor table exchange

Quelle/Source: Hans van der Zanden

13 Shoes with hard metal inserts (Betek)

Quelle/Source: Hans van der Zanden

14 Anvil impact intensity drops progressively when anvils wear off

Quelle/Source: Hans van der Zanden

15 Anvil protruding to achieve perpendicular impact drops progressively when radial distance between rotor and impact face increases

Quelle/Source: Hans van der Zanden

16 Stator principle

Quelle/Source: Hans van der Zanden

17 Stator impact intensity is not affected when wear progresses

Quelle/Source: Hans van der Zanden

18 VSSI – Vertical Shaft Stator Impact crusher

Quelle/Source: Hans van der Zanden

19 Stator segment with standing support members and wear pattern

Quelle/Source: Hans van der Zanden

20 Streamlining of the housing with the aid of closed inner space, sunk inlet and low lid positioning

Quelle/Source: Hans van der Zanden

21 Hinged inlet assembly

Quelle/Source: Hans van der Zanden

22 VSSI or Vertical Shaft Stator Impact crusher

Quelle/Source: Hans van der Zanden

Summary: The VSI concept is simple and applies impact loading, necessary for the production of high quality aggregates for asphalt and concrete. But the VSI does not live up to its expectations in its traditional configuration with shoes and anvils, which is a very difficult combination, expensive to run and quality drops when the anvils start to wear off. Moreover, the shoes have to be exchanged manually but weigh more than 40 kg, far above the maximum handling weight of 20-25 kg, recommended by international Health and Safety authorities. A new technology is now available that solves these problems in surprisingly easy way and at much lower operational costs, providing the VSI a new future. Major simplification is here the key element.

Quality aggregates

Quality aggregates for the production of asphalt and concrete require that the broken particles are strong, have a uniform structure and are cubiform with fresh surface texture.

Aggregates make up to 90 % of asphalt and about 70 % of concrete volume, and have therefore a profound impact on the quality of asphalt road works and concrete structures. For example, the workability during placing, stress distribution, durability, and the contact between tires and the road surface, are among the properties strongly affected by the aggregates.

Before rock material is quarried it has...