mayr power transmission is extending the tried-and-tested ROBA-guidestop series with a new, high-performance, pneumatically released version. With this innovative braking concept, which fulfils the ever- increasing safety requirements and achieves a high performance density without the use of hydraulics, the company sets new standards.
ROBA-guidestop clamps profiled rails equally accurately and backlash-free while achieving the same high holding forces as the hydraulic design of the brake. The ROBA-guidestop is opened with compressed air at 20 to 30 bar. In order to achieve the necessary operating pressure, a compact pressure booster is used in combination with the brake, which mechanically increases the system pressure from 4 to 6 bar as is usual in pneumatic networks, without the use of external energy. This innovative concept enables a selective pressure increase directly prior to the brake; as a result, short high-pressure lines suffice. The pneumatic ROBA-guidestop safety brake is available in five construction sizes – each size in both a standard design and in a compact, short design – covering a range of holding forces from 1 to 34 kN. It is designed for the different rail construction sizes of conventional linear guidance manufacturers.
The ROBA®-guidestop safety brake acts with extremely high rigidity directly applied to the linear guidance. This means that it is mounted directly on the masses which should be held. Drive elements between the motor and the moving mass, such as spindles, spindle nuts, shaft couplings or gearboxes, therefore have no influence on the safety – as opposed to the concepts using motor brakes, where all drive elements transmit the braking torque to the carriage.
The backlash-free clamping of the ROBA®-guidestop directly onto the profile rail provides yet further advantages: the additional rigidity of the NC axis increases process accuracy, improves machining performance and can provide further technological advantages for heavy machining, for example.
The machining produces less vibrations and therefore the surface quality of the workpiece is positively influenced. In case of a stationary axis, for example during machining, the brake can absorb the load. As a result, it is possible to switch off the drive motor in this phase and remove it from the controls. This eliminates control movements and is therefore gentle on the ball screw spindle. The closed brake absorbs the axial forces. The service life and maintenance intervals of the drive components are extended.