New solutions for high integrity brakingVertical movement of loads introduces varying requirements for brake safely and integrity. Specialist manufacturer INTORQ has a range of answers with their spring applied brake systems in disc and caliper designs. Brakes are capable of both emergency stop and holding duties. Basic brake designs are highly reliable with multiple springs and stable friction material. Where vertical movement of goods or people requires higher integrity, INTORQ have three concepts for increased safety.
A simple option is to duplicate the braking with a double brake, effectively two brakes piggy-backed together into one assembly. These are available starting at 2 x 4Nm and extending to 2 x 1800Nm. Both brakes are normally used together, so in the event of an unlikely catastrophic failure to one of them, 50% of the torque remains. Microswitches can be fitted to monitor correct brake operation and therefore to signal a fault.
The next option is to supply a single brake that is modified with two internal circuits. The modifications are made to both the mechanical structure and the electrical circuit. Torques range from 15 to 900Nm and the BFK454 brake range meets the requirements of TRA 200 and EN-81 for hoists. Such dual circuit brakes with their redundant braking feature are also used in personnel lifts.
Caliper brakes are also a useful option where redundant braking is required. For example, if four calipers are enough to generate the emergency torque required, additions of just one more can give safe operation should a caliper fail. Microswitch monitoring will detect the failure and shut down operation. INTORQ offer caliper brakes suiting discs of diameter 20 up to 500mm with thrusts from 1200 to 8000N. Over excitation of the DC brake coils is used for reliable release with large running air gaps.
Other News from Lenze Ltd
Latest news about Brakes