1.The following factors to effect the tension of conveyor belts:
---The approximate amount of elongation of the belt owing to belt load.
---The belt length tolerance.
---The temperature,stop-and-go operation,etc. which may externally necessitate a higher elongation or tension than justify the allowance of a tension take-up reserve normally.
Normally, an elongation at fitting in the range of approx. 0.1 ¨C 1% is available to load, so that a tension take-up range of 1% belt length is adequate.
And the tensioning weight must make sure of moving freely. To attain sufficient grip by the belt on the drive drum,the tensioning weight must achieve the minimum belt pull with gravity-operated take-up systems. The take-up unit can be allowable to install after the drive unit. And it¡¯s now a wise use for a reversible conveyor by such a design.
2.When belt and pulley transmits the effective pull, the Frictional force would occur by the flat belt drives.Several shafts may be driven in opposite directions at one or the same time through the simple and inexpensive drives. Meantime, the following features of flat belt drives are also the theoretical considerations:
1. favorable elastic (dampening) quality
2. low running noise
3. highly precise and uniform running performance
4. high degree of efficiency (98-99%)
5. feasible speeds of 100 m/s or more
6. transmitted up to 60 kW/cm
