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Editorial team · Power transmission, Mechanical components

An innovative braking system to increase the safety of vertical axes

An innovative braking system to increase the safety of vertical axes
Appropriate measures must be taken to reduce the risk of accidents wherever there is a danger of heavy loads falling on vertical axes in areas where personnel operate.

Mayr®, the specialist in mechanical power transmission and brakes based in Mauerstetten in Bavaria (Germany), has developed safety braking systems capable of addressing all critical hazardous situations that arise during the operation of vertical axes.

Masses moved vertically, particularly heavy parts such as electric motors or gearboxes, pose a serious safety hazard if, in the event of a power failure, their movement unexpectedly accelerates or if they fall in an uncontrolled manner.

Mayr® offers the ROBA®-topstop, a complete range of single brakes and redundant dual-circuit braking modules providing protection against all critical hazardous situations that can occur during the operation of vertical axes and are defined in standard DIN EN 954-1, categories 1 - 3.

In developing the ROBA®-topstop, not only were safety aspects carefully considered, but also the intrinsic characteristics of the drive elements of vertical axes. These brakes can easily be integrated into existing designs thanks to the suitable dimensions of their flange between the servo motor and the intermediate flange.

Moreover, thanks to its modular design, the system makes it possible to create numerous versions: for example, with shaft ends or hollow shaft, with flexible coupling, with an additional torque limiter, or with two brakes independent of each other.

Using a ROBA-topstop braking system with a hollow shaft and integrated plug-in shaft coupling eliminates the separate compensating coupling as well as the coupling housing that is usually required.

A drive with this braking system is hardly longer than a conventional axis with a servo motor and a shaft coupling designed to connect to a spindle or to the shaft of a gearbox. The ROBA®-topstop versions with shaft end are essentially designed to be interfaced between the servo motor and the hollow shaft gearbox.

The ROBA®-topstop, as an independent module, holds the vertical axis in all positions. Therefore, measures to lock the axis, for example during transport or maintenance operations, are not necessary.

This advantage significantly reduces the costs and time required, for example, to replace the drive motor, as well as downtime during repairs. Furthermore, the ?safe brake? function is guaranteed if the braking units are equipped with wear and release monitoring provided for this purpose.