Operating principle in plant

A mobile cold recycling mixing plant - here`s how it works

  1. High-precision injection systems

    Highly precise injection of water, bitumen emulsion or foamed bitumen for a wide range of applications.

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  2. Slewing conveyor

    Powerful conveyor system with large slewing angles for discharge of the recycled mix on trucks or stockpile.

  3. Hopper take-off conveyor including material weighing

    Precise weighing of the source material to enable metering of the amounts of added water and binder and transport to the mixer.

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  4. Powerful diesel engine

    High-performance diesel engine to ensure independence from public power supply.

  5. Quick setup procedure

    Hydraulically driven components to speed up the plant’s setup procedure.

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  6. Operating concept

    The entire mixing process is clearly displayed on the control display. The control elements and displays provide the operator with full and precise information on all the relevant process parameters.

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  7. Ease of transport

    Entire plant mounted on a 3-axle flatbed truck to ensure ease of transport and setup in the vicinity of the construction site.

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  8. High mixing capacity

    Production of over 200 t/h of homogeneous cold mix by means of the heavy-duty continuous mixer.

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  9. Auger conveyor with weighing unit

    Slewing auger conveyor including weighing auger for the precise feeding of cement from a cement silo or hopper.

  10. Large, twin-chamber proportioning hopper

    Large proportioning hopper with hydraulically folding vibrating screens for reliable screening of oversize material.

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  11. Large water tank

    4,500-litre water tank for reliable water supply during the recycling process.

The KMA 220 / KMA 220i is mounted on a flatbed semitrailer and equipped with an independent powerstation. The mobile concept enables the plant to be relocated to different operating sites quickly and set up in next to no time. Wheeled loaders empty all kinds of unbound source materials into the proportioning hopper via vibrating grids. Silos and / or tankers supply the plant with binding agents such as cement, bitumen emulsion or foamed bitumen. For high-precision metering, a microprocessor-controlled system monitors the addition of source materials and binding agents into the mixing chamber. A heavy-duty twin-shaft compulsory mixer produces a homogeneous construction material of high quality. In a final step, the recycled mix is simply discharged via the slewing belt conveyor which enables even long semitrailers to be loaded to full capacity.

Key benefits of the mobile cold recycling mixing plant

The plant can easily be transported from one job site to the next and is quickly set up in the immediate vicinity of the site. This saves time and truck capacities, and is also highly beneficial to the environment. What’s more, the KMA 220 / KMA 220i impresses with exceptionally high daily production rates of a consistently high quality. The cold mixes can be produced from various construction materials and used for high-quality construction projects. The result: this mobile concept represents economical road rehabilitation “par excellence”.

Immediate site vicinity - short haulage distances

The KMA 220 / KMA 220i is a mixing plant that comes to the job site, making long haulage distances from the production site of the mix to the paving site and back a thing of the past. It enables you to save time and in particular costs, reducing expensive truck journeys and fuel consumption to a minimum. The environment benefits as well: the reclaimed material can be fully reused, which helps to save natural resources. And what’s more, the source materials need neither be dried nor heated to be suitable for mix production. The mobile plant is equipped with an energy-effi cient diesel engine that is capable of working up to two full days with just one tank filling.

Setup in the most favourable location

“Flexibility at work” is yet another discipline that has taken our mobile mixing plant to the top step on the winner’s rostrum. Whether supplying water and emulsion from the left or the right side, feeding cement from the left or the right side, feeding cement via a cement silo or manually via cement bags, or deciding on the position of the cement silo: all’s possible. This leaves much room for assembling the KMA 220 / KMA 220i in the ideal position, as the immediate proximity to the job site or stocking location is an inestimable advantage when it comes to time, cost and energy savings.

The plant’s compact dimensions of only 2.50 m in width and 19.20 m in length enable it to be operated even in extremely restricted space conditions. Tanker trucks for water or bitumen emulsion can be positioned on both sides of the plant. The cement auger conveyor can be positioned either on the right or on the left side. The discharge conveyor has a wide slewing range and is an additional, valuable option when it comes to ensuring the plant’s independent choice of location.

Recipe of success for high-quality pavements

The plant produces cold mixes suitable for a broad range of different construction applications, such as motorways, high-quality base layers in road construction, pavements for car parks and storage areas. The pavements built from these high-quality cold mixes impress with their resistance to deformation, improved flexibility and long service life. Cement, bitumen emulsion and foamed bitumen are the binders used for highly stressed road pavements. Added cement produces hydraulically bound base layers of excellent structural capacity. A combination of bitumen emulsion and cement produces bitumen / cement-bound base layers of high quality. Added foamed bitumen and cement produce high-quality, stable base layers with excellent flexibility and durability properties.

State-of-the-art, efficient cold recycling

With the development of the KMA 220 / KMA 220i, WIRTGEN has set the bar high once again when it comes to the performance, efficiency and quality of cold recycling mixing plants. Its mobile concept turns the KMA 220 / KMA 220i into a transportable production plant. The KMA 220 / KMA 220i can produce mixes either in batch mode with subsequent loading on trucks (pre-selection of tonnage) or in continuous mode for subsequent stockpiling. The secret is in its tried-and-tested microprocessor control system. The discharge conveyor has a wide slewing range and is suitable for producing large stockpiles and loading large trucks. Stockpile production is particularly suitable for mixes produced with foamed bitumen, as these can be stored over extended periods of time. Changing several trucks “on the fly” guarantees high production rates even when loading the material on trucks.

Market-leading and cutting-edge products for the Road and Mineral Technologies business sectors are constructed at the WIRTGEN brand headquarters in Windhagen, Rhineland-Palatinate. With its innovative, high-performance and cost-efficient products and technologies for cold milling, soil stabilization, hot and cold recycling, concrete paving and surface mining, WIRTGEN leads the world market in road construction and repair, as well as in mining natural rock and pay minerals.

© 2017 WIRTGEN GmbH