MILL DUTY THRUSTER BRAKES
INSTALLING BRAKE IN POSITION
INSTALLING THRUSTER ON BRAKE
1
2
17
8
9
6
7
14
11
12
13
15
17
3
16
4
5
18
5
INTRODUCTION
CONSTRUCTION AND OPERATION
Thruster brake is a device to retard the speed of moving machinery
and to stop it accurately to the desired position. The braking force is
applied to the brake shoes by a pre-streesed compression spring.
The shoe press on the rotating brake drum retarding its speed and
finally stopping it. Other release device like pneumatics /hydraulic
cylinder or manual release arrangements can be offered on request.
To insert the brake in position, the brake shoes are to be
taken apart to clear the drum diameter. To don this,
slacken the spring settling nut and the tie-rod nut in the 14 9
side arm and pull it slightly. This increase the distance between
the brake shoes. Insert the brake on the foundation bolts.
Adjust shoes by setting screws and position them on brake17
drum. Re-tighten the setting bolt and the tie-rod nut.9
Tighten the foundation bolt 18 .
The thruster tank is to be filled with sufficient quantity of oil
as mentioned in the Thruster dimension Table. To mount the
thruster on the brake, remove one side splits pins on the
thruster hinge pins. in the base frame of brake and lever .15 12
Remove both pins and re-insert them after positioning the
thruster on the pin holes in the base and the lever of the base
Replace both split pins. Check that the thruster movement is
unobstructed when the crane lever is pulled manually and
the thrust rod of the thruster is free to move. Open the terminal
box cover of the thruster and connect power supply cables to
the three terminals on the terminal plate inside the terminal box.
Terminate the earthing lead on the earth terminal plate inside
the te rmi nal pr ovi ded on the thruster or br ake .
Replace the terminal box cover on the terminal box.The thruster
is ready for operation.
ALIGNING AND SETTING OF BRAKE
TECHNICAL DATA
Next, align the brake shoes with the diameter and the surface of
the brake drum and adjust the lock nuts 9 on the tie-rod such
that shoes grip the brake drum equally. Energize the power
cables, this will cause the thrust rod of the thruster to move up
and the shoes release th brake drum. Adjust the gap between
the drum and shoes to 0.3 to 0.5mm (with feeler gauge) equally
by adjusting the setting bolts 17 on both arms. For equal and
uniform liner wear it is necessary that the shoes and the arms
move equally. Ensure the brake drum is free to rotate when the
brake is released.
ADJUSTING BRAKING TORQUE
To adjust the braking torque to the desired value, the
pre-loadingof the compression spring is to be done by top 13
nuts on the spring tie rod. To increase torque, turn nut 14
clockwise. For most applications, braking torque of about
150 to 250% of rated torque of the drive motor is sufficient.
Colour RAL 7021
POWDER COATING
Asbestos Free Liner
Lining Wear Indicator
Open Brake Limit Switch
Manual Opening & Locking
System
LAF
OL
LWI
MS
A thruster shoe brake has a pair of shoes which are lined up with1
friction pads 2 the shoes are hinged on main arm and side arm 3 4
of the brake, each of them have hinge pin fitted in the base. Both5
arms are connected to each other on top by a tie rod .A hinge in 6 7
the main arm and the swivel block lock nut in the side arm, and8 9
the other end is fixed on top clevis of the thruster by a hinge pin11
.A brake spring ,is fixed on the main arm and is pre - loaded 12 13
by a locknut on the lever. The pre-tension in this spring decides14
the braking torque The thruster is fitted on the base by a hinge pin.
When the thruster is not energized, the brake shoes are pressed on
the brake drum 16 fitted on the drive motor shaft and is braked
under the effect of braking force provided by spring. In such
condition, the brake is applied, and the drum cannot rotate. When
the thruster motor is energized , the lifting force provided by thruster
lifts up the crank lever causing the arms and the shoe to move
away and the brake is released. The spring is compressed and
braking energy is stored for the next cycle.
OPTIONAL
Visit us at :
www.speedocontrols.com
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H. O. Unit -I : C-15/16, Nand Jyot
Industrial Estate, Andheri-Kurla
Road, Mumbai - 400072 ,
Tel : (022) 42469700/730
Unit - II: Plot No. 4912, G. I. D. C.,
Phase IV, Vatva,
Ahmedabad - 382445
Tel.
:
(079) 68169700/702/712
