Construction material processing

Heart and soul - the perfectly engineered milling and mixing rotor

Milling technology is our core expertise, and that is why the milling and mixing rotor installed in the WR appears to be cast from a single mould. Engine output and milling performance of the different machine models have been perfectly matched, the respective combinations of working width and working depth enabling efficient operation. The massive rotor design promotes smooth rotation without any jolts or shocks, thus reducing stress and strain on the drive elements. Toolholders on high bases have been arranged across the entire width of the milling and mixing rotor in a perfect pattern to guarantee homogeneous mixing of the construction materials regardless of the working depth. The hydraulic rotor turning device moves the rotor into the ideal position effortlessly to assist the operator with tool replacement. In addition, the hard-wearing quick-change toolholder system ensures optimum tool rotation, easy tool replacement and effective, continuous operation for extended periods of time.

Homogeneous quality of the recycled mix even in tough operating conditions.

Homogeneous quality of the recycled mix even in tough operating conditions.

Tool replacement made easy using the hydraulic cutting tool extractor.

Tool replacement made easy using the hydraulic cutting tool extractor.

Effective milling rotor drive

The WR features a direct mechanical rotor drive which translates high engine power into an equally high milling and mixing output. Large wrap angles on the belt pulleys enable the heavy-duty power belt to transmit the engine power to the rotor gearbox with only minimum performance losses, thus ensuring high efficiency. Positive side effects of the intelligent drive concept are fuel economy and ease of maintenance.

Direct mechanical drive via power belt with automatic belt tensioner.

Direct mechanical drive via power belt with automatic belt tensioner.

In addition, nine (WR 200 / WR 200i, WR 240 / WR 240i) and twelve (WR 250) different rotor speeds, respectively can be adjusted via the right-hand arm console in the operator’s cabin and the two-stage rotor gearbox on the one hand, and by repositioning the belt pulleys on the other. When adjusted to the correct rotor speed, the WR achieves the specified mixing results at the highest possible advance speed and lowest possible fuel consumption rates.

The intelligent drive design ensures fuel economy and ease of maintenance.

The intelligent drive design ensures fuel economy and ease of maintenance.

Different engine speeds can be adjusted from the operator’s platform.

Different engine speeds can be adjusted from the operator’s platform.

Premium mixing quality regardless of the working depth

The rotor housing and rotor plates have been designed to perfectly match the powerful milling and mixing rotor. The mixing chamber volume is adjusted to the current working depth and material quantity automatically by raising or lowering the rotor. The variable mixing chamber increases with the working depth, thus ensuring maximum performance and good mixing results even when operating at the maximum depth. These features enable the machine to produce perfectly homogeneous mixes from the milled material and binders added. In addition, optimized transport of the mix in the rotor housing results in a tremendous increase in throughput and productivity. The rotor plates at the front and rear provide effective closure of the mixing chamber, serve as material guides and are used to level off the stabilized or recycled layer.

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.

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