crane duty helical gearbox

Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox is dependent upon correct selection. The selection of a gear unit is usually influenced by the class of duty of the crane that ought to be determined and specified. Single, Double and Triple stage Horizontal gear products type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical gear units type VC are suggested for cross travel drives of the EOT crane. Assembly arrangement must be specified while buying the gear units.

1. Compute the required reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Make reference to the rating desk, discover in the ratio column and based on input rpm verify the gear box rating horizontally for various class of duty of the crane.
4. The size ought to be selected such that the rated HP is equal or even more than the crane duty helical gearbox consumed HP.

EXAMPLE
1. Decide on a unit to transmit 9 HP from 720 rpm electric electric motor for hoist drive in a course II duty crane, the decrease ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will end up being suitable.
· See the ratio column and in the size HB-350, for insight rpm of 720 in course II duty the rated HP is 9.5
· Because the consumed HP is definitely 9, the machine HB-350 will end up being suitable.

2. Select a unit to transmit 3 HP from 960 rpm electric electric motor for cross travel drive in a course IV duty crane, the reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will become suitable.
· Start to see the ratio column and in the size VC – 32Q, for input rpm of 960 in class IV duty the ranked HP is 3

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