Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. The selection of a gear unit is definitely influenced by the course of duty of the crane that ought to be determined and specified. Single, Dual and Triple stage Horizontal gear products type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical gear systems type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement should be specified while purchasing the gear units.<\/p>\n
1. Compute the mandatory reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Make reference to the rating table, find in the ratio column and predicated on input rpm verify the gear box rating horizontally for various class of duty of the crane.
4. The size should be selected in a way that the ranked HP is equal or more than the consumed HP.<\/p>\n
EXAMPLE
1. Decide on a unit to transmit 9 HP from 720 rpm electric motor for hoist drive in a course II duty crane, the reduction ratio required is 31.50.
\u00b7 For hoist drive a two stage horizontal gearbox type HB will become suitable.\u00b7 Start to see the ratio column and in the size HB-350, for input rpm of 720 in course II duty the ranked HP is 9.5
\u00b7 Since the consumed HP is certainly 9, the unit HB-350 will end up being suitable.<\/p>\n
2. Decide on a unit to transmit 3 HP from 960 rpm electric motor for cross travel drive in a class IV duty crane, the decrease ratio required is 14.26.
\u00b7 For cross travel drive, a vertical gearbox type VC will be suitable.
\u00b7 Start to see the ratio column and in the size VC – 32Q, for insight rpm of 960 in class IV duty the rated HP is 3<\/p>\n