Page 5 - Industrial Technology Extra - 26th May 2020

repetitive accuracies. Only the friction of the high-
quality pressure flange bearing takes effect.
The kinetic energy of the rotating mass stored in
the system can slow down freely. The element
clutches can be re-engaged simply and quickly, only
using a hammer. Additional tools are not required.
Overload clutches can cope with long slow-down
times for the drive following disengagement. Only
the robust clutch bearing is to be considered when
defining the permitted slow-down time.
“Our clutches are designed so that the bore
stroke can, if necessary, be traversed to the end
with the clutch disengaged,” explains Ralf Epple.

Non-destructive overload protection
In contrast to other overload systems which work for
example with pressurized hydraulic oil or shear tunnel sector. With this weight and the compact
pins, the EAS-HT torque limiters are immediately outer diameters, they are ideally suited as a retrofit
ready for operation after the overload cause has solution when existing systems are overhauled",
been removed. They are not damaged and can adds Ralf Epple. “And we have not forgotten to take
withstand several hundred overload cases. In the price into consideration; our clutches are in
addition, it is possible to trace at which torque the some cases even cheaper than other solutions.”
EAS-HT clutches have disengaged. Prior to leaving the Mayr plant in Mauerstetten,
“On other systems, the ‘proof’ so to speak is each clutch is extensively tested and set exactly to
destroyed after the overload occurrence, and the required value. For this purpose, the company
uncertainty prevails regarding the disengagement has diverse, modern testing equipment; it can also
torque,” says Epple. “Moreover, the destroyed call on decades of experience in development and
components have to be replaced after overload. design. “In the tunnel and mining branch alone, we
This generates costs and system downtime. The have in the meantime put several thousand torque
required components have to be available, and in limiters into use and have therefore gathered the
addition, specialist knowledge is required for appropriate experience with regard to the
recommissioning. There is a risk of the torque being adjustment values,” adds Ralf Epple.
incorrectly adjusted. However, an incorrectly “In addition, we regularly receive positive
adjusted clutch does not make sense. The feedback from the operators. In particular if existing
consequences are simply too high - not only in the systems have to be retrofitted, it is possible to
field of tunnelling and mining.” decisively increase their performance using our
Also with regard to size and weight, the EAS-HT clutches. We often analyse the drive line together
torque limiters by Mayr are ahead of the rest. “We with our customers and, where necessary, can also
have achieved weight savings of up to 50 percent in offer torque limiting clutches together with vibration
the new, compact designs, which have been damping systems.”
specially designed and further developed for the www.mayr.com

May 2020 • INDUSTRIAL TECHNOLOGY EXTRA! • p5