TSUBAKI EMERSON CAM CLUTCH

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www.bergab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 223-3071 ■ INFORMATION FOR SELECTION Selection Procedure 1. Determine the mode of operation (indexing, overrunning, or backstopping). 2. Refer to the selection procedure corresponding to the mode of operation. Indexing a) When detailed load conditions can be calculated, apply formula A, and when not, apply formula B and check the torque on the Cam Clutch. b) Select the clutch by: a) Design torque requirement b) Maximum indexing cycles N c) Feeding angle θ θ≥90°....MI-S θ < 90°....Other series d) N × θ N × θ≤20,000....MZ, PB, 200, MI, MX, PO, PG, PS N × θ≤50,000....MI-S e) Bore size and installation method Note: MX Series are designed especially for highspeed and high-accuracy indexing. Please consult <strong>TSUBAKI</strong> for proper selection. 9550·kW T = × SF N T: Loaded torque (N·m) kW:Transmitted power (kW) N: Speed of Cam Clutch shaft rotation (r/min) SF: Service factor b) Select clutch by: a) Design torque requirement and service factor b) Maximum overrunning speed c) Bore and installation method If the SF is not known, use the peak torque with shock factor method. Type of Load No shock load Moderate shock load Shock load Heavy shock load SF 1 – 1.5 1.5 – 2.5 2 – 3 4 – 6 SF = Motor peak torque at staring x shock factor, K. The shock factor K is obtained from the chart below by calculating inertia ratio. Use a shock factor of K = 1 when the inertia ratio is below 0.48. Formula A: T = J·q·N 2 10380 + TB T: Loaded torque on Cam Clutch (N·m) J: Inertia of load (kgf·m 2 ) on Cam Clutch shaft θ: Feeding angle (deg) on Cam Clutch shaft N: Indexing cycles per minute (c/mm.) TB: Brake torque calculated on Cam Clutch shaft (N·m) Formula B: 9550·kW r2 T = · × 2.5 n r1 T: Loaded torque on Cam Clutch (N·m) kW:Transmitted power (kW) n: Speed of crank shaft (r/min) r1: Length of crank r2: Length of lever on Cam Clutch 2.5:Factor Backstopping Reference Table of backstopping torque/rotating speeds BS450 BS425 BS350 BS335 BS300 BS270 BS250 BS220 BS200 BS160 BS135 BS110 BS95 BS85 MG1300R MG1200R MG1100R MG1000R MG900R MG800R MG750R MG700R BR240P BR220P BR190P BR180P (BR150P) BR130P BR100P BR90P BR80P BR70P BS75 MG600R BR60P BS65 BS50 MG500R MG400R BR50P BR45P BR40P BR35P BR30P BR25P Overrunning a) Calculate the torque on the Cam Clutch according to the following formula: BS30 MG300R BR20P www.bergab.ru Берг АБ bergab@ya.ru Тел. 73 (495)-228-06-21, факс (495) 223-3071
www.bergab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 223-3071 a) Calculate the static torque reverse motion from the maximum load expected and multiply it by the service factor. b) Select the clutch by: a) design torque requirement b) max. overrunning speed c) bore and installation method Notes: 1. The BS series is designed especially for mounting on the main drive shaft of conveyors, where the rotational speed is rather low, while the MG-R series is designed for highspeed backstop applications. 2. Do not exceed the maximum torque of the clutch. Also, please consult <strong>TSUBAKI</strong> for special applications. For Belt Conveyors Selection Procedure: (1) Calculate the power to move an empty belt and idlers: (P1) r + r0 P1 = 0.06 × f × W × V × (kW) 367 (2) Calculate the power to move a loaded belt horizontally: (P2) r + r0 P2 = f × Qt × (kW) 367 (3) Calculate the power to move the load vertically: (P3) h × Qt P3 = (kW) 367 (4) Calculate the back stop power: (Pr) Pr = P3 – 0.7(P1 + P2) (kW) (5) Calculate the back stop torque: (T) 9550 × Pr T = × SF (N·m) N (6) Select the proper clutch which satisfies the calculated backstop torque. Note: f = Friction coefficient of rollers = 0.03 (normally used) W = Weight of moving parts of the conveyor in the unloaded condition (kg/m) Use the values from the table below. Width of Belt (mm) Estimated Weight: W Width of Belt (mm) Estimated Weight: W 400 22.4 1050 80 450 28 1200 90 500 30 1400 112 600 35.5 1600 125 750 53 1800 150 900 63 2000 160 V = Velocity of conveyor (m/min) Qt = Max. possible load (tonnes/hour) h = Total lift (m) r = Horizontal distance between head pulley and tail pulley (m) r0 = Modification coefficient for r = 49 m (normally used) N = Shaft speed (r/min) on which the clutch is mounted. SF= Service factor Select service factor from table below: SF Service condition 1.5 Backstopping: Several times a day 2.0 Backstopping: More than several times a day For Bucket Elevators Selection Procedure: (1) 9.8 × (L + D) × Qt × D × 1000 T = × SF (N·m) 120 × V (2) Select the proper clutch which satisfies the calculated backstoptorque (T). Note: L = Total lift (m) D = Pitch circle dia. of head sprocket (m) Qt = Possible maximum load (tons/hour) V = Velocity of conveyor (m/min) SF= Service factor Use the values from the table below. SF Service condition 1.5 Several times a day 2.0 More than several times a day Note: For the conveyor types other than those in the above examples, calculate the backstop torque accordingly. Always allow for the maximum possible load in your calculations, since backstopping often occurs when the conveyor is loaded above its normal loading capacity. Motor Stall Torque Method Another method commonly used to select the proper backstop clutch size for conveyors is to use the motor name plate ratings plus the motor’s ability to produce excess torque. Depending on the motor size, it may develop over 300% of rated torque. After stalling an overloaded conveyor can overload the backstop. For proper selection of the backstop, all facets of the mechanical system should be considered to ensure that the backstop is not the weakest link in the conveyor drive. If the motor breakdown torque is not known, refer to the motor manufacturer. Selection is based on the following formula: Motor name plate kW × 9550 S Motor stall torque T = × ≤ Tmax Shaft speed N (r/min) 100 S = Stall torque percentage Tmax = Cam Clutch maximum torque at the 500,000 times point of the fatigue capacity graph (N·m) Tmax = Catalogue rated torque x 1.8 or Motor name plate kW × 9550 Motor stall torque T = × SF ≤ catalogue max torque Shaft speed N (r/min) Depending on motor stall torque, apply the following service factors: Stall torque Up to 180% Up to 240% Up to 300% Select the Cam Clutch which satisfies the calculated torque T. SF 1.0 1.3 1.6 www.bergab.ru Берг АБ bergab@ya.ru Тел. 74 (495)-228-06-21, факс (495) 223-3071
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TSUBAKI EMERSON CAM CLUTCH

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