Drums of our concrete mixers have capacity of 4 to 12 cubic meters. The mixers are driven by hydraulic systems made by Sauer, ZF nad Rexroth or ZTS Sabinov hcustomized for continuous operation due to application of an oil cooler with an airflow induced fan. The system is powerd by axial piston variable displacement pump that transfers the pressure to a motor located in the drum's axis, in the front. The motor drives the drum via a planetary gear and the rotational speed can be adjusted in the range of 0-14 rpm. The hydraulic pump is driven by power take-off from the vehicle's engine. The power take-off may transfer engine torque up to 1200 Nm and feed the hydraulic system (rotate the drum) while the vehicle is in motion. The frame of concrete mixer is fixed to chassis in such a manner that the concrete mixer's power transmission system is insensitive to deformations of frame side member, which is a first-class feature for a vehicle working in conditions typical for construction sites.
The concrete mixer is equipped with a water tank of 350 or 600 dm3 enabling that concrete mixer can be kept clean at all times. The pressure is produced by delivering air from pneumatic system if the chassis onto the water surface. Water under pressure is directed to an installation that ends with hose with a suitable nozzle ideal for proper cleaning during and after concrete unloading process - the drum, hopper and discharge chutes must be rinsed thoroughly so no sediments or residues of concrete mix gather deposit on them. Capacity of the water tank decides about the superstructure's total autonomy, as not always and not on all construction sites is running water available in necessary amounts.
The drum is made of ST52-3 steel and rotates on the carrying rollers made of high-strenght steel. Inside there are mixing spiral blades made of high-strength and wear-resistant steel. The feeding hopper, discharge chute and extensions chutes are also made of wear-resistant steel sheets. During unloading the concrete mix travels through discharge hopper to discharge chute that can be rotatedhorizontally by 180o and adjusted vertically by approx. 30°.
As the vehicle's engine is controlled electrically the installation is equipped with an electric controller of rotational speed mouted in waterproof box in the back.
