The applying extent of live-roller is larger than that of beltconveyors. It can be used in accumulation, divergence, confluence andcomparatively heavy loadings. Besides, it is also extensively used inenvironment which is wet, oil and with high or low temperature. Theseapplications can use different driven patterns to meet the requirements.Here is a brief introduction to different kinds of driven patterns：

(1)Flat-belt-driven Live Roller

  The structure of the Flat-belt-driven Live Roller is the similar to thatof belt conveyors. However, a row of carrying rollers are equipped onthe belt and a pressure roller below to regulate the intensity degree.

   As is the same with gravity roller, the choosing of the carrying rolleris related to the interval. Pressure roller located between the twocarrying rollers can be regulated up and down to increase or decreasethe driven power of the loading. For example, if the cotton box is inthe divergence region, the pressure roller must be regulated higher toincrease the driven power. Generally speaking, the regulation of thepressure roller is to reach the least tension and maintain the moving ofthe items. As the width of the belt has nothing to do with the surfaceof the transported items, narrow belt can be used. The width of the beltdepends on the effective belt pull. The widest width of the belt dependson the rollers on the end and the interval between driven units.

BP＝F(L＋B＋R)＋sinθ(I)＋0.3(D)

BP＝Beltpull (kg)

 F＝frictionfactor（10％）

L＝loading(kg)

B＝beltweight (kg)

R＝rollerweight (kg)

θ＝declinationangle

I＝theweight loaded on the declination angle(kg)

D＝theheaviest weight of the loading deflection(kg)

EBP＝BP?.25(kg)

hp＝

efficient＝belttransmission efficient×the reducer efficient

Thebiggest inclination angle is 5 degree. If larger, the item should betested.

(2)V-belt driven roller

  The way to drive v-belt is the same as that of the flat-belt. However,flat-belt is changed into v-belt and the pressure wheel is changed intopressure roller equipped on the side of the framework. V-belt is mainlyused for comparatively light loading and short-distance conveyors. It isbetter to use formed circle v-belt to get better intensity and longlifespan.

   V-belt driven roller is suitable for turning and conjunction section forit can reach elasticity deformation along with the curve. Furthermore,using the same power and v-belt can brig along turning and conjunctionmodules besides the direct modules.