Low speed drives have traditionally been provided by some form of geared reduction with often quite complex arrangements, but now there is an attractive and simple alternative using direct hydraulic drives.
Hägglunds Drives manufacture a very wide range of motors which eliminate the need of gearboxes the need of gearboxes and present some very interesting benefits on applications like rubber mills and mixers, roll or screw presses and all kinds of shredders.
They are compact, simple, highly efficient and user friendly suitable for all environments including ATEX. They give smooth control and can be stopped and started, even reversed as often as you like using the responsive pump control, so you don't have to oversize the electric motor to give high start up torques. There are no costly foundations or alignment problems either.
The free standing cabinet style power unit, which can supply several drives can be positioned well away in some convenient place leaving a very compact drive arrangement with minimal maintenance to do and providing stand-by and redundancy if required.
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Picture One (top)
This Charles Lawrence shredder benefits from the compact drive from Hägglunds with up to 3 times nominal torque in forward and reverse which enables automatic reversing to un-jam rotors and keep production flowing optimising the functionality of all type of shredders. The low inertia also keeps forces within design limits and reduces wear, maintenance and downtime.
Picture 2 Rubber processing machines like this extruder-sheeter or mills and internal mixers improve productivity with direct hydraulic drives. They are responsive, forward/reverse and fast stop, giving full torque even at the very low end of speed range with through hole facilities for cooling water.
Picture 3 Process applications like displacement or screw presses are ideal for direct hydraulic drives. The speed can be controlled in relation to load to improve the performance. The power unit can be positioned conveniently away from the machine improving operator and maintenance access.
Picture 3 A typical Hägglunds Drive consists of a drive motor selected from the wide range available to give the torque required. A power unit with a variable displacement pump/motor set and necessary tank, filters and instrumentation. A control and monitoring unit and the inter piping. The arrangement is versatile and flexible which enables customisation to suit the exact requirements of the application and environment.
