Motovario

• Motovario supplies power train solutions: gear reducer + motor + inverter
• High torques and intense axial loads: required for processing viscous materials.
• 24/7 continuous operation: machine downtime is a significant cost factor.
• Precise speed and torque control: essential for ensuring the quality of the extruded product.
• Energy efficiency: reducing operating costs and complying with environmental regulations.
• Heavy-duty working environments: dust, heat, vibrations.
• Optimal sizing
• High level of customisation
• Maintenance

The extruder screw is driven directly by an industrial gear reducer, which can reliably deliver high torque: this is necessary in order to sustain a continuous work cycle, which may sometimes be subject to overloading.

The gear reducer must also be robust enough to withstand the strong axial thrusts generated by the extruder screw on the output shaft while in operation.

Typically, the gear reducer is selected for use with parallel shafts, with reduction ratios ranging from approximately i=10 to i=25, depending on the type of material being processed. For space-saving purposes, it can also often be installed vertically at the end of the line, with the motor and output shaft on the same side as the gear reducer itself.

It is essential to prevent the lubricant inside the gear reducer from overheating. Where this is not possible due to the high installed power ratings, special accessories such as cooling devices are installed in the gear reducer.

Motovario offers a series of gear reducers equipped with a variety of accessories that are ideal for use with extruders thanks to their exceptional performance and reliability.

In fact, the MHD/PBZ series is suitable for mid- heavy-duty applications requiring industrial gear reducers with a performance of up to 110,000 Nm.

The MHD/PBZ parallel shaft gear reducers can be equipped with a version designed specifically for use with extruders. This means they can be fitted with a suitable axial thrust bearing housed in a dedicated spheroidal cast iron flange. Depending on each application’s characteristics, each size can accommodate two different bearing sizes in order to meet even the highest axial thrust requirements, with a load capacity of up to 4,300 kN.

For space-saving purposes, a version can be selected that has both the output shaft and the input shaft on the same side of the casing: for low ratios, you can also request the gear reducer with a ‘long’ casing, which allows both the output flange and the electric motor to be present simultaneously without overlapping.

When it comes to cooling devices, there are a variety of options available, including copper coils and external heat exchangers. These systems also utilise water as a cooling medium, which is usually present in plastic extrusion plants.