Hamm is bringing together its two previous compactor series, the 3000 series (Tier 3) and the H series (EPA Tier 4/EU Stage V), on one platform – the HC series – with operating weights in the range of 11–25t and power in the range of 85–160 kW. On all models, the drum width is 2140mm. In addition to the previously known sales variants, in future, there will be CR machines with reinforced components for applications on difficult terrain and special equipment for applications on rocky ground.
In comparison to the predecessor models, Hamm has increased the compaction power. The manufacturer has increased the centrifugal force by up to 15%, and the static linear load is as high as 80.6 kg/cm. A new cast articulated joint with articulated joint lock allows for a greater steering and swing angle with improved kinematics. Gradeability is improved due to optimised weight distribution in combination with traction control. The front vehicle and the scraper have been redesigned, which provides increased clearance on the drum.
The Smart Doc app developed by Hamm, graphically displays all of the key compaction parameters as well as the compaction progress, and logs the measured rigidity as well as the position data.
Pivot-steered tandem rollers
Hamm is launching a new generation of pivot-steered tandem rollers, the HX series, designed for precise compaction. The HX 70i model (7 t/55.4 kW) and HX 90i (9 t/74.4 kW) achieve high surface outputs on large construction sites, but also handles challenging tasks such as compaction in curves.
The compaction technology with split vibration and oscillation drums actively prevents cracks and bulges from forming in the asphalt. The automatic reversing with electrically adjustable seat operating unit brakes and accelerates the rollers quickly, but smoothly. The seat also turns automatically in the direction of travel when reversing.
The models in the HX series can be equipped with the Smart Compact, the new automatic compaction assistant which combines the operations handled via via smartphones, computers and other digitally controlled devices. The automatic mechanism sets compaction parameters for each drum. The driver only has to enter whether a base-, binder or asphalt surface course is to be compacted. The Smart Compact assistant decides automatically whether to compact with vibration and big or small amplitude, with oscillation, or statically. It evaluates physical properties of the asphalt, such as the temperature or rigidity. New features include the integration of local weather data via an integrated weather station and the assessment of the complex cooling behaviour in the area of tension between the asphalt and air temperature, as well as the wind. Based on all of this information, the system determines the right setting separately for both drums. Smart Compact detects when an asphalt layer is almost completely compacted. The system then automatically cancels the dynamic compaction and puts the roller into the Eco mode. As a result, the engine speed is reduced by up to 20%, which also means that up to 15% fuel can be saved. Smart Compact therefore not only increases the compaction quality but also conserves the machine and resources.
The HX series looks different to its predecessor series due to its newly designed lights and sheet-metal brackets, as well as details around the cab. In the cab, the unobstructed view to the rear left has been further improved. The new camera system with monitors (IP 66), which is integrated as standard, also improves the view into the rear space. In future, water and additive will be stored separately in the additive mixing unit. This saves water and the additive can be dosed with high precision. Furthermore, new spreader models with suitable tarpaulins and other extras are available for the HX series.