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FEATURE CLUTCHES, BRAKES & COUPLINGS


ROBOT... STOP! N


ot only does Fibro Läpple Technology (FLT) produce automation solutions


for a wide variety of industries and for all machining and handling processes, but its modular concept means the company can flexibly address customer requirements. One component of the tried and tested


modular construction system is the new LGR-3 linear gantry robot for machine configuration and for handling workpieces. Boris Bind, head of design mechanics & development, said: “With the linear gantry robot, we can automate individual process cells. The advantage of a gantry construction is that it is set up above the machine tool. This means that access to


reliably prevents the axis from falling and harming people. The gantry is therefore also considered safe for these application cases,” explained Bind.


BRAKE DESIGN Being compact, the ROBA-linearstop can be integrated into existing machine and system designs easily, quickly and without complex adjustment work. It acts on a separate braking rod. When the brake closes, the rod is held backlash- free. The ROBA-linearstop operates without a self-reinforcing wedge effect and therefore acts in both movement directions. The axis does not drop on


“In the electric version of the gantry, the company


relies on the ROBA-linearstop safety brakes from mayr power transmission. These feature high positioning accuracy and are backlash-free”


the machine and the work area remains free – contrary to a classic robot, which occupies a lot of space. Depending on the design and construction type, the gantry robot can bridge larger working areas. Under certain circumstances the gantry also crosses some areas in which people are present.” So, in the electric version of the gantry, the company relies on the ROBA- linearstop safety brakes from mayr power transmission to secure the vertical axes. These feature high positioning accuracy and are backlash-free. In case of power failure or emergency stop, the brake holds the axis in any position. It operates according to a fail-safe principle (i.e. it is closed in de-energised condition); and the braking force is generated via thrust springs. “The linear brake in the vertical axis


closing thanks to the force generation without a self-reinforcing wedge effect, together with extremely short reaction times. Other linear braking systems which operate using a self-reinforcing wedge effect generate a high braking force, but the wedge effect only functions in one direction and the brake must ‘reset’ to generate the wedge effect on closing. If the wedge effect of the brake is not limited, then the braking force increases infinitely, and the machine construction must absorb this impact. Furthermore, the clamping device must often be cleared with enormous force to release the brake. This is not necessary with the ROBA linearstop. “It is important for us that the peak


load which occurs during braking is not too high,” added Bind. “We require a constant force progression during


Compact safety brakes from mayr power transmission have been selected for a linear gantry robot. Here the company explains why


The electromagnetic ROBA-linearstop brake reliably prevents the vertical axis from falling and therefore protects people and materials


braking, which means that the console can be smaller. Moreover, the brake must be compact, because there is little overall space available.” Many linear brakes mainly act as static


clamping units and are designed to hold the axes at standstill, explains mayr. The ROBA-linearstop safety brakes, which are available in electromagnetic and also pneumatic or hydraulic versions are more than just clamping units. These are designed to reliably hold the load and are also suitable for emergency braking. Prior to the brake leaving the


Being compact, the ROBA-linearstop can be integrated into existing machine and system designs easily


34 OCTOBER 2018 | DESIGN SOLUTIONS


mayr power transmission works in Mauerstetten, the required force is set with the corresponding safety level. This value is checked and documented, meaning that every serial number is traceably allocated. The electronic database in which the measurement values are archived, together with the associated serial numbers of the product, guarantee 100% traceability.


mayr power transmission www.mayr.com


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