357 Check the Core Body for Allowable Tension [Step 1] Calculating the Effective Tension The effective tension of a belt can be calculated using Formula 1. Formula1 F=f(WG+W1+W2)L+f(W1+W3)L±WG ∙ H (Carrier Side) (Return Side) (Vertical Side) F: Effective Tension f: Rolling friction coefficient of rollers, or friction coefficient between belt and supports (Select from Table -1) G: Weight of Carried Materials per Meter of Belt (kg/m) 1: Weight of belt per Meter (kg/m) 2: Carrier Roller Weight per 1m (kg/m) (Select from Table -2) 3: Return Roller Weight per 1m kg/m (Select from Table -2) L: Conveyor Horizontal Length (m) H: Vertical Height (+Up angle, -Down angle) (m) [Step 2] Power Requirement [Step 3] Motor Power P: Power Requirement kW F: Effective Tension N V: Belt Speed m/min 60000: 60×102 (Constant) F ∙ V Formula 2 P = 60000 Pm: Motor Power kW P: Power Requirement kW : Mechanical Efficiency (Standard Mechanical Efficiency Range: 0.5~0.65) P Formula 3 Pm = The motor with 0.1kW or less output may encounter the power shortage phenomenon. Thus, check the motor for its characteristics before use. [Step 4] Using the Tension on the Loose Side to Calculate Maximum Tension FM1: Maximum Tension N F: Effective Tension N K: Coefficient Based on the value μ selected from Table-3 and the wrap angle ( ), select value K from Table-4. (When the wrap angle ( ) is not listed in Table 4, calculate as follows) μ: Friction coefficient between driving pulley and belt (Select from Table-3) e: Base of Natural Logarithm (2.718) ': Radian Formula 4 FM1 = F ∙ K eμ ' K= eμ '−1 2π ( '= × ) 360 [Step 5] Using Pretension to Calculate Maximum Tension [Step 6] Allowable Stress FM2: Maximum Tension (N) B: Belt Width (mm) TC: Initial Tension (N/mm) (Select from Table-5) Formula 5 FM2=F+B ∙ TC C: Allowable Stress for Belt N/mm FM: Effective Tension kg B: Belt Width mm FM Formula 6 C≥ B When the allowable stress for the belt being used is equal to or higher than the maximum tension per 1cm width of the belt as expressed by Formula 6 above, the belt is suitable for use. Table of f Values (Table 1) Table of Roller Weight (Table 2) Table-2 shows the weight of the revolving parts of a roller that meets (JISB8805-1965). For accurate calculation, check the actual weight of the roller being used. (When knife edges are used, add 0.2 to the above values in Table -1.) List of μ values (Table-3) Table of Value K Based on Wrap Angle ( ) (Table-4) Table of Tc Values (Table-5) Compare FM1 (Formula 4) and FM2 (Formula 5), and regard the larger as the Max. Tension FM. Belt Surface in Contact with Supports Smooth Cloth Surfaced Roller Support 0.05 0.05 Roller+Steel Plate Support 0.2 0.3 Steel Supported (SUS·SS) 0.4 0.5 Plywood Support 0.5 0.6 Roller Dia. (mm) Single Roller (kg/roller) Allowable Load (kg/roller) 28.6 0.2 50 Surface Shape in Contact with Pulley Pulley Surface Smooth Cloth Surfaced Bare Steel Pulley Dry 0.2 0.3 Wet 0.15 0.2 Rubber Ranking Pulley Dry 0.3 0.35 Wet 0.2 0.25 μ ° 0.1 0.15 0.2 0.25 0.3 0.35 0.5 180 3.8 2.7 2.2 1.9 1.7 1.5 1.3 190 3.6 2.6 2.1 1.8 1.6 1.5 1.3 200 3.4 2.5 2.0 1.8 1.6 1.5 1.3 210 3.3 2.4 2.0 1.7 1.5 1.4 1.2 220 3.2 2.3 1.9 1.7 1.5 1.4 1.2 230 3.1 2.3 1.9 1.6 1.4 1.4 1.2 No. of Tension Members (No. of Plys) 1 Pc. 2 Pcs. 3 Pcs. Initial Tension (N/mm) 0.15 0.30 0.45 As the back of the belt has a cloth surface, avoid using iron plate or plywood as support as much as possible. Carrier Side: When the front side of the belt has a cloth surface, or is coated with silicon or fluorocarbon resin, avoid using iron plate or plywood as support as much as possible. Compatibility with roller or tables depends on the belt type. Return Side: Check the selected belt core body for adequacy of the corresponding allowable stress, by going through the following steps. Flat Belts Selection of Flat Belts
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