Drum Brakes
Drum brakes are for use whenever a constant brake torque is of utmost importance, not only for reasons of safety but also from a commercial standpoint. Mostly seen in applications like for instance Belt conveyer system, stacker and reclaim.
- Drum Brakes Options details
Drum Brakes
Function Principle
Spring applied, electrohydraulic thruster released
Brake torque adjustable
Brake applies in case of power failure ( Fail-Safe Principle)
Special features
Continuously adjustable brake spring enclosed in a square tube with torque scale
Spring protected by tube from damage and contamination
Automatic wear adjustment (AVN) guarantees even lifting gap
Equal air gap by bearing spring
Shoe clamping springs which prevent brake shoes from tilting when released
Self-lubricating bushings mean brakes are easy to service, no greasing necessary
Pins and nuts & bolts made of stainless steel
Options:
Automatic wear adjustment (AVN)
Monitoring devices: brake open/ brake close/ lifting gap monitoring
Special construction for horizontal and suspended mounting with support
Hand lifting device
Options details
AVN automatic wear adjustment
Automatic wear adjustment is used for compensation of lining wear. The wear adjustment takes place without paying attention to the remaining brake lining thickness.
However its compensating capacity per breaking cycle is limited. Therefore an additional manual wear compensation carried out by maintenance personnel is required according to the specific application.
If the brake is used as holding brake, then AVN is needless, for the abrasion hardly happens in this application.
Hand lifting device
The hand lever is used to open the brake manually in case of an emergency or to service the brake unit.
By pulling up the hand lever the mounted cam will force the knee lever up and thus open the brake. Secure the hand lever manually in position as long as the brake stays open.
Brake position control
One limit each can be used to monitor the following brake positions:
Closed
Opend
Adjust brake(check)- remaining stroke is marginal
The limit switches require no special maintenance. With rough conditions, following routine maintenance is recommended:
Check actuators of limit switch, shafts and rollers, for easy operation
Remove all dust, snow or ice etc.
Keep cams and roller shafts clean and lubricate slightly
Check sealing of cables or conduit connections
Damping valve
The damping valve is to slow down assembly of brake torque.