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Fail-safe
Reliable brake systems for linear movements
Safety brakes ensure that vertically-moved axes do not sink or fall uncontrollably even in extreme situations such as power failures. In addition to rotatory brakes, which take effect on the motor shaft or the spindle in the drive line, mayr power transmission’s ROBA-linearstop is a system capable of holding linear-moved masses accurately in position via a rod. In an emergency, it can also brake moving loads.
- Arrangement of the hydraulically-operated ROBA-linearstop safety brake in the universal turning machine CTX 420 linear made by Gildemeister.
ROBA-linearstop brake systems were originally developed specifically for the high dynamic demands usual on linear motors. The brakes are released hydraulically or pneumatically and work according to the fail-safe principle. They are closed in de-pressurized condition, and thereby accord with the safety aspects required in all operating conditions including EMERGENCY STOP and power failure. The braking force is also maintained even if the brake is damaged, for example power supply cable breakage. Fail-safe therefore means that the brakes continue to take effect even in adverse conditions and during operational malfunctions.
The ROBA-linearstop works without producing a selfamplifying wedge effect. This means that it can take effect in both moving directions. The force transmission takes place backlash-free. Due to the very short reaction time and force production without wedge effect, the axis does not sink on release. Several braking systems for linear movement work with this self-amplifying wedge effect. It does produce a high braking force - but this is one advantage against a substantial number of disadvantages. The wedge effect only works in one direction. To produce this effect, the brake has to “settle” on closure. If the wedge effect of the brake is not limited, the braking force increases ad infinitum. The machine construction has to adsorb this impact. Not only that, but the clamping devices must often be driven free in order to release the brake.
This settling of brakes with wedge effect may only total a few millimetres. However, even this small amount is far too much for many applications. For example, a manufacturer of vertical annealing systems had to replace the brake originally conceived for this system with a backlash-free ROBA-linearstop, because when using the original brake, the vertical linear motor axis sank on power failure by 2 to 3 mm. Another machine manufacturer solved a safety issue using the ROBA-linearstop. Their previous brake design partly lost its holding capability due to the penetration of cooling lubricant, making it a serious risk factor. With the new solution, it still wasn’t possible to prevent small amounts of cooling lubricant entering the brake body, but the functional safety was not affected and the braking force was not reduced.