Types of Load (Cont.)
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- In hoisting systems in which tail ropes or balancing
ropes are not used, the load torque is not only due
to the weight of the unloaded or the loaded cage but
also due to that of the lifting ropes or cables, which
depends on the position of the two cages.
- When cage 1 is at the bottom most position and is
to be lifted upwards, the entire weight of the rope
is also to be moved up.
- When both cages remains at the same height, the
weight of the rope to be lifted becomes zero, as the
weight of the ropes on both sides balances each other.
- When cage 1 is at higher position than cage 2, a
portion of the weight of the rope acts in such a way
as to aid the upward motion of the cage 1 and when
cage 1 occupies the topmost position, the whole weight
of the rope aids in upward movement.
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