How To Calculate Mobile Conveyor Belt Tensions

Mobile conveyors are essential in ports, mining, and construction for flexible bulk handling. Correct belt tension calculation ensures reliable operation, prevents slip, and avoids costly downtime.

Key Belt Tension Terms

• Effective tension (Te) → total force required to move belt and load.
• Tight‑side tension (T1) → pulling side of drive pulley.
• Slack‑side tension (T2) → return side tension.
• Take‑up tension (T0) → maintains sag ratio and tracking.

Standard Calculation Formula

The effective tension equation (CEMA/ISO 5048/DIN 22101):

T_e=L⋅K_t⋅(K_x+K_yW_b+0.015W_b)+W_m(LK_y+H)+T_p+T_am+T_ac

• L = conveyor length
• K_t = temperature factor
• K_x, K_y = resistance factors
• W_b = belt weight per unit length
• W_m = material weight per unit length
• H = lift height
• T_p, T_am, T_ac = pulley, acceleration, accessory resistances

Step‑by‑Step Calculation

• Measure conveyor geometry → length, incline, pulley wrap.
• Determine load rate → tons/hour or kg/s.
• Calculate belt weight → based on width and type.
• Apply resistance factors → friction, flexure, environment.
• Compute Te → plug values into formula.
• Check T1/T2 balance → ensure drive traction.
• Validate sag ratio → prevents slip and excessive sag.

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