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Formsprag Clutch LCB-200 Backstops for Dragline Ventilation Fans
A leading global fan OEM needed an economical backstop for cooling fans used on a
mine dragline. Controlling the temperature inside draglines is a significant challenge.
Operating in hot, arid conditions combined with the heat generated from up to 20 various
electric drive motors can create dangerously high temperatures. The large fans prevent
overheating of personnel and equipment by improving cooling and ventilation.
However, problems occur when the ventilation fans are turned off and air flow from the
environment or other fans in the system can back-drive the fans, causing them to rotate
in the opposite direction (windmilling). Starting a fan while it is windmilling can damage
the motor and reduce the life of the drive system belts.
Formsprag engineers specifically designed the economical, low-torque LCB Series
backstop to prevent problems associated with windmilling in fan applications. The Model
LCB-200, with a torque rating of 150 lb.ft. (200 Nm) and a speed range of 0-3600 RPM,
was the ideal solution for this application. The backstops feature a compact, easy-toinstall
design requiring only 1.125" of shaft engagement. Units have a wide operating
temperature range of -13 to 194° F (-25 to 90° C), which was important for this hot,
dusty mine application. All LCB models are lubricated for life and self-actuated with no
power or utility required to operate.
Highlights
- 150 lb.ft. (200 Nm)
torque rating
- Economical backstop
design
- Stops fan windmilling,
extends fan drive
system life
- LCB-200 bore range:
1.85 to 3.5 in. (47 to
88 mm)
- Self-actuated, no power
or utility required
- Lubricated for life
- 0-3600 RPM speed range