MATERIALS HANDLING
• Four cover plate opening settings, which can be adjusted from fully covered to fully open.
This combination of settings offers almost unlimited possibilities to influence the top particle size and the particle size distribution, according to the company.
Illustration of The Impact Sizer
settings. The Surface Miner´s general adjustment possibilities for particle size control like machine forward speed, cutting drum speed and cutting depth combined with the Vario Impact Sizer offer almost unlimited control over the material´s top particle size.
WHY A VARIO IMPACT SIZER? Machines in cut-to-ground or windrow applications produce coarse material that might be larger than the specified top particle size. This is where the Wirtgen Vario Impact Sizer offers a solution. The system is designed to fulfill precisely this requirement by influencing and limiting the top particle size. Finer material passes through the sizer and leaves the crushing process while coarser material is crushed until it can pass the sizer too. Proven in both coal and bauxite applications, the product effectively manages the size of the material produced, ensuring that it meets the necessary specifications. One of the standout features is that it is mounted directly to the cutting drum housing, allowing for seamless integration into the material processing workflow. Multiple settings
The Impact Sizer’s gap settings
can be made to accommodate various rock types, ensuring that it can handle a wide range of friable and porous rocks like coal, bauxite or chalk. The robust design of the Vario Impact Sizer ensures that it can withstand the challenging mining applications permanently.
DIFFERENT SIZERS FOR DIFFERENT APPLICATIONS The Vario Impact Sizer is available with two different Wirtgen Surface Miners: the 220 SM(i) and the 220 SM(i) 3.8. The particle size is controlled by adjusting:
- Standard machine operation settings • Machine’s forward speed, ranging from 0 to 84 metres per minute.
• Cutting drum rotation speed, with six standard settings on board.
• Cutting depth, ranging from 0 to 300 mm or 350 mm.
This runs in combination with:
- The Vario Impact Sizer settings • Five general gap settings, ranging from 22 mm to fully open.
OPERATION IN COAL AND BAUXITE MINING APPLICATIONS When mining coal in India, the system demonstrated the improvements in controlling coal particle sizes, with specific settings designed to achieve a target size of less than 100 mm. In bauxite mining, the Vario Impact Sizer delivered strong results in the regions of Boffa and Boké in Guinea. During mining in Boffa, the sizer was set to fully open, allowing the system to manage a cutting depth of 300 mm, a high forward speed and therefore maximum output. In Boké, the settings were adjusted to target a material size of less than 100 mm, demonstrating the system’s adaptability to different types of bauxite and varying crushing behaviors.
CONCLUSION The Vario Impact Sizer’s settings allow operators to exert precise control over the top particle size, which in turn influences the overall particle size distribution and production performance. Each setting has a unique impact on the process parameters, including particle size distribution, production performance, fuel consumption, cutting tool consumption and wear and tear of parts and components. By adjusting the settings, operators can achieve a balance between the individual requirements according to rock and product and the overall process efficiency.
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