A powerful and extremely energy-efficient clamping unit RÖHM
"With our new EHS, all of the applied energy is used for the actual purpose, namely clamping the work piece, and not to compensate for any oil leaks", says Eugen Hangleiter from Röhm, enthusiastically explaining a decisive advantage. With high stiffness and clamping forces up to 50 kN, the rotational symmetric hollow chuck is suitable for high speeds up to 10,000 rpm. Due to the fact that the hydraulic system is replaced, there are no more oil leakages with all of their negative side effects. The oil distribution that previously restricted the speed is no longer a weak point. High forces are used efficiently and the electrical hollow chuck is self-locking. Together with a permanent magnet, this means that the initiated power of the motor is maintained when it is switched off. Safety is even guaranteed during power failure. In addition to the self-locking feature, this is also provided by the motor's short-circuit. The initiated torque practically remains intractably saved due to the drive and the screw drive in connection with a harmonic-drive with a load-free restoring torque. An electronic positioning device precisely determines the position of the tie bar. It permanently controls the rotational speed of the motor and compares it with the spindle speed. The power of the EHS is several times higher than pneumatic aggregates, for example. This makes the hollow chuck particularly interesting for use in wood processing machines that cannot use hydraulics but sometimes require high levels of power. All manufacturers of lathes and grinding machines generally profit from the advantages.
15 November 2010
