Rock crusher from Wirtgen breaks coarse rocks while processing road layers

The WRC 240(i) from Wirtgen is designed to break coarse rocks, such as those found in hand-packed pavement layers or stony soils, to produce a homogeneous soil mix in a continuous process.

In addition to crushing rocks and stones with an edge length of up to 300 mm and a compressive strength up to 200 MPa, the WRC 240(i) can add cement and water in the same pass, when preparing base layers, for example. Cement can be pre-spread with a binding agent spreader, and the water required is sprayed into the mixing chamber of the Rock Crusher via the machine’s Varioinjection bar.

Along with rock crushing the machine is also used for soil stabilization. Pre-spread binding agents like lime or cement are mixed into the existing soil with insufficient bearing capacity and transform it into a high-grade construction material that is deposited evenly behind the machine. The WRC granulates and mixes a variety of soils, courses, and layers to produce a homogeneous final product in a continuous process. This reduces construction times, conserves resources, and lowers CO2 emissions.

The vertically-stacked, hydraulically-adjustable classifying screens of the WRC 240(i) ensure that only material that has reached the desired grain size is output from the crushing process in the rotor housing.

Wirtgen

A rugged crushing and mixing rotor has tool holders developed especially for crushing applications. Tools are fitted with large impact-resistant carbide cutting edges and the holder bases are protected by wear-resistant protective elements made from high-tensile steel. This ensures high machine utilization raes and process reliability in demanding applications. Robust edge protectors reduce wear on the edge ring segments of the rotor, which is driven by a transmission developed specifically for the WRC.

The rotor housing is lined with abrasion-resistant wearing plates made from extremely tough high-tensile steel that guarantees a longer service life and increases overall stability. The entire mixing chamber is lined with hard-wearing plates that can be individually replaced as needed.

Several setting options allow the WRC 240(i) to reach desired grain size and achieve consistently uniform distribution. Nine rotor speeds, a variable crushing stage, exchangeable screens with a range of clear mesh sizes and adjustable distance from the rotor, adjustable rotor plate pressure, and the machine advance rate can all be changed to meet site and application needs.

The satellite-based AutoTrac system enables precise, automatic steering and a high degree of environmental compatibility. It steers the machine accurately within tolerances of a few centimetres based on a previously calculated reference strip and specified overlaps. Wirtgen Performance Tracker registers all relevant location-specific working parameters to provide a comprehensive database for analysis and documentation of the construction site.

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