Commissioning Of Brake Mechanism; Adjustment Of Air Gap Among Friction Disk, Armature And Electromagnet Core - XINDA WYJ140 Series Operating Manual

the main axle of the traction machine are coaxial rotation, the main axle brakes.
Normal release：When the traction sheave prepares to rotate or is rotating, the electromagnet coil
is energized, and the armature and iron core will pull in with the function of electromagnetic force
and overcomes the pressure force of the brake spring and release the brake wheel rim, friction disk
and the main axle rotate coaxially.
● The function of the braking micro-switch is to determinate that if the brake is under
releasing state or braking state. The terminal of the switch should be connected to the
control circuit of the motor. As it is safety switch, when the users need, the brake can
be functioned as one part of the up travel car over-speed protection components.
● Brake mechanism consists of two groups of separate operation mechanisms, and
each group consists of electromagnet, armature, spring, friction disc and thread
bushing. If one group of operation mechanism is damaged, the other group is still in
effect to ensure the safety of the elevator operation

6.2 Commissioning of brake mechanism

● The brake is set to rated braking torque before delivery. Generally, users do not need
to readjust it.
● As the two groups of operation mechanisms are fixed by the same 4 lock bolts, each
group operation mechanism can not be disconnected independently.
● The rated braking torque of brake, refers to the braking torque of all the brakes on the
traction machines is 2.5 times of the torque when the machine is at rated torque. For
WYJ140 series traction machines, it adopts 2 groups of brakes, so the rated braking
torque of brake refers to the braking torque of one group electromagnet is 1.25 times
of the torque of the rated torque of traction machine.
6.2.1 Adjustment of air gap among friction disc, armature and electromagnet core
Step 1：loosen the 4 thread bushings on one brake,
do not loosen the thread bushings on another brake
Step 3：loosen 4 lock bolts to angle 72 degrees anticlockwise,
at this time, the gap between the friction surface of the friction
disc and the two braking surfaces are around 0.15mm, measure
Step 2: tighten 4 lock bolts completely to enable the
braking surfaces of the friction disc to press on the armature
and electromagnet core fully
Step 4: tighten the 4 thread bushings completely.
At this time, one brake is already adjusted. Use
this method to adjust another brake.