Gearboxes for counter-rotating
parallel twin-screw extruders

Although the range of gearboxes for counter-rotating twin-screw extruders used for medium, high and very high torques is already very wide, Zambello updates it constantly both with new sizes of standard products and customized gearboxes manufactured based on the needs of the customer.

NRB seriesWith a transmissible torque density up to 17 Nm/cm3 per shaft, he gearboxes of the NRB series have a horizontal shape (mounting position B3), which requires a connection to the electric motor by belts and pulleys. As a matter of fact, the reduction ratios available cover a ratio up to a maximum of i=25.

ZT3 serieswith a transmissible torque density up to 17 Nm/cm3 per shaft, the gearboxes of the ZT3 series have approximately the same features as the NRB series, but have a vertical shape (mounting position B7). In this case, the connection between gearbox and electric motor is carried out by an elastic coupling. Due to the possibility to mount the electric motor in the U arrangement, the final result is a very compact extruder. Reduction ratios available go from i=14 to max. i=80.

TST series – The TST range (Twin Super Torque) is available in two versions: TST-H and TST- 2H. Both series offer very high performance rates.

TST- H seriesWith a transmissible torque density up to 20 Nm/cm3 per shaft, the gearboxes of this series are designed for challenging applications, where a high torque is required, which is transmitted by means of a single reversing unit. The connection to the electric motor is obtained by means of an elastic joint. Reduction ratios available go from i=14 to max. i=80.

TST- 2H seriesWith a transmissible torque density up to 22.5 Nm/cm3 per shaft, the gearboxes of the TST-2H series present the highest technology level, that sets them on the top position of the world market, suitable for applications of extremely high performance.
The transmission of the torque is obtained by means of a double reversing unit. Reduction ratios available go from i=14 to max. i=80.