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two-block condition
created by
NSA
(
thing
) by
NSA
(4.1 y)
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1
C!
Wed Jun 26 2002 at 2:51:27
The cable lifting apparatus on a
crane
passes through the
pulley
block
at the tip of the
boom
, and one on the hook. Like any pulley system this gives a mechanical advantage to the
hoist
, allowing heavier lifts. As the hoist is located on the stationary
superstructure
, when the boom telescopes outwards (or is lowered), the hook block will be pulled towards the boom end as the cable effectively shortens. The "two-block condition" occurs when the hook block runs into the boom block, snapping the cable and causing the load to drop. Needless to say, this is a
Very Bad Thing
. It can be prevented by spooling out cable fast enough to match the extending boom. Modern cranes have mechanical sensors which alert the operator if the two-block condition is imminent.
printable version
chaos
Superstructure
Final Fantasy
MEMS
load moment
crane
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