WITTUR WSG-TB.3 series, Руководство по эксплуатации

Страница: 87 / 148

Maintenance and repair
INTORQ | BA 14.0197 | 04/2016 40
7 Maintenance and repair
7.1 Wear of spring-applied brakes
INTORQ spring-applied brakes are wear-resistant and designed for long maintenance intervals. The friction
lining and braking mechanism are subject to operational wear. For safe and trouble-free operation, the brake
must be checked at regular intervals or replaced, if necessary
41.
The table below shows the different causes of wear and their impact on the components of the spring-applied
brake. The influential factors must be quantified so that the service life of the rotor and brake can be calcu-
lated and so that the prescribed maintenance intervals can be specified accurately. The most important fac-
tors in this context are the applied friction energy, the initial speed of rotation of braking and the operating
frequency. If several of the causes of friction lining wear occur in an application at the same time, the influ-
encing factors should be added together when the amount of wear is calculated. The calculation of the ser-
vice interval can be supported by the design program INTORQ-Select.
NOTICE
Braking torque reduction
The air gap must not be re-adjusted after it has been correctly adjusted during the initial
installation of the brake on the motor! This could result in a loss of braking torque.
Component Cause Effect Influencing factors
Friction lining Braking during operation Wear of the friction lining Friction work
Emergency stops
Overlapping wear during start and stop of
drive
Active braking via the drive motor with sup-
port of brake (quick stop)
Starting wear in case of motor mounting
position with vertical shaft, even when the
brake is not applied Number of start-stop
cycles
Armature plate and
counter friction
face
Rubbing of brake lining Run-in of armature plate and
counter friction face Friction work
Gear teeth of
brake rotor Relative movements and shocks between
brake rotor and brake shaft Wear of gear teeth (primarily
on the rotor side) Number of start-stop
cycles
Brake support Load reversals and jerks in the backlash
between armature plate, adjustment tubes
and guide pins Breaking of armature plate,
adjustment tubes and guide
pins Number of start/stop
cycles, braking
torque
Springs Axial load cycle and shear stress of springs
through radial backlash on reversal of arma-
ture plate
Reduced spring force or
fatigue failure Number of switching
operations of brake
Tab. 7: Causes for wear