341 $BMDVMBUJOH &GGFDUJWF 5FOTJPO %FUFSNJOJOH "MMPXBCMF 5FOTJPO BOE 4BGFUZ 3BUJP PG #FMU 1A. How to Calculate Pulley Mass on Return Side * Calculation formula for Flat Belt Head Drive Conveyor * The calculation methods for Center Drive and other conveyors are different. * For Head Drive Conveyor, Pulley + Steel Sheet Support 2A. How to Calculate Tight Side Tension of Belt 1B. How to Calculate Effective Tension of Belt * The effect from belt support rollers is ignored. 5BCMF 'SJDUJPO $PFGGJDJFOU PG #FMU BOE #BTF 1MBUF 3FGFSFODF 7BMVF 5BCMF .BUFSJBM 'SJDUJPO $PFGGJDJFOU Flat Belt 5JNJOH #FMU Stainless Steel 0.40 0.30 Aluminum - - 5BCMF 'SJDUJPO $PFGGJDJFOU PG %SJWF 4JEF 1VMMFZ BOE #FMU 1VMMFZ 4VSGBDF $POEJUJPO Flat Belt and Pulley 0.20 Stainless Steel Belt and Pulley 0.20 Sprocket and Plastic Chain 1.00 Timing Belt and Pulley 1.00 5BCMF *OJUJBM 5FOTJPO QFS #FMU 6OJU No. of Plies / NN 1 0.15 2 0.30 3 0.45 2B. How to Calculate Initial Tension per Belt Unit 2C.How to Calculate Safety Ratio of Belt Compare FM1 and FM2 and use the larger value as the maximum tension "FM" to calculate maximum tension per belt unit "C". n : No. of Pulleys on Return Side (n) π : Pi (3.14159) D : Pulley O.D. on Return Side (mm) Wr : Pulley Mass on Return Side (kg) d : Pulley I.D. on Return Side (mm) Wr1 : Pulley Unit Mass = 2.8 g/cm3 Lr : Pulley Length on Return Side (mm) Formula 1 Wr=1/4[π t (D2-d2)] t Lr t Wr1 t n/10002 C=FM/B C : Max. Tension per Belt Unit (N/mm) FM : Max. Tension (N) B : Belt Width (mm) S : Safety Ratio of Belt (Determination of the safety ratio varies depending on your operating conditions, etc.) 0 : Allowable Tension of Belt (N/mm) [Select from "Belt Specification"] Formula 5 S=0/C FM1 : Tight Side Tension (N) e : Base of Natural Logarithm (2.71828) ' : Contact Angle of Belt and Pulley = 3.14 (rad) [Contact angle of the head drive conveyor should be 180°] μ0 : [Select from Table 2] Formula 3 FM1=[eμ0 t '/(eμ0 t '-1)] t Te FM2 : Initial Tension of Belt (N) Te : Effective Tension of Belt (N) Tc : Initial Tension per Belt Unit (N/mm) [Select from Table 3] B : Belt Width (mm) Formula 4 FM2=Te+Tc t B Te : Effective Tension (N) Wg : Workpiece Mass (kg) Total mass of the workpiece loaded onto a flat belt Wb : Belt Unit Mass (kg/m2) [Select from "Belt Specification"] L : Length between Pulleys for Conveyor in Use (mm) B : Belt Width (mm) μ1 : [Select from Table 1] g : Gravitational Acceleration = 9.80665m/s2 μ2 = 0.2* [From Table 1 on P. 357] Formula 2 Te={[(Wg+Wb t L t B/10002) t μ1] +(Wr+Wb t L t B/10002) t μ2]} t g Belt Support Roller Return Side Drive Side L: Distance between Pulleys )FBE %SJWF $POWFZPS *NBHF Conveyor How to Calculate Conveying Capacity of Conveyor - Safety Ratio of Belt -
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