< Back Q↑↓ Appendix 1 Dec 2016 Common Test + Automatic Zoom SECTION B (70 marks) Question 2 A conveyor belt is driven by

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: Back Q Appendix 1 Dec 2016 Common Test Automatic Zoom Section B 70 Marks Question 2 A Conveyor Belt Is Driven By 1 (59.59 KiB) Viewed 34 times

< Back Q↑↓ Appendix 1 Dec 2016 Common Test + Automatic Zoom SECTION B (70 marks) Question 2 A conveyor belt is driven by a motor, via a compound gearbox and a belt drive. The gearbox has an efficiency of 90% and the speed reduction ratio 25:1. The belt drive has an efficiency of 96% and the speed reduction ratio 2:1. The conveyor drum requires a torque of 550 Nm at approximately 58 rpm. The belt conveyor operates for 12 hours per day and assume the load is gradually applied. Belt Drive 772 = 96%, VR₂ = 2:1 Ø30 EL! mm Conveyor Drum Motor 1 1000N Coupling Gearbox Tension due to conveyor Drum Shaft 11 90%, VR₁ = 25:1 Belt Bearing A Input shaft 78 (5 of 9) iskusk 1 2 Figure 2.1 4 3 Output shaft F X Xx Bearing B Print For Markers Only Download □>>> >

B 340 Input shaft L 凶凶 + Automatic Zoom Figure 2.1 2 Fig.2A Layout of two-stage gearbox EDA, ESD1 (AT, AMS & ME) Official (Closed) - Non Sensitive 3 Output shaft 凶凶 1500 N 50mm 77 COC 1000 N 150mm 150mm. Fig.28 Layout of Dum Shaft B Dec 2016 Common Test 27

lite.edu.sg/d2/le/content/51876/topics/files/download/3378080/DirectFile TopicDownload - + Automatic Zoom Official (Closed) - Non Sensitive 2.1 Motor (1) Calculate the rotational speed required by the motor. (ii) Calculate the power required by the motor. (iii) Select a suitable 3-phase Brook Crompton motor for the system stating the following: Motor frame size: Et B L • Motor power : Motor speed: acer For Markers Only /4 16 15

B SAY 2.2 + Automatic Zoom Coupling For the selection of Fenaflex flange coupling: (1) (ii) (iii) Determine the service factor Ks, the design power Po and the suggested coupling size. Calculate the design torque To and the maximum design torque TDmax required. Select and check the suitable coupling to be used by stating the following: ● nominal torque & maximum torque ● maximum speed • coupling type acer For Markers Only 13 14 17 27°C D

Re.edu.sg/d21/le/content/51876/topics/files/download/3378080/DirectFile TopicDownload - . maximum bore size 561 + Automatic Zoom Q2.2 Total /14 EDA, ESD1 (AT, AMS & ME) 79 Dec 2016 Common Test Official (Closed) - Non Sensitive 2.3 Gears For Markers Only The details of the gearbox are shown in Fig 2A. The two smaller (gears 1 and 3) have 18 teeth each, and gear 4 is 4 times larger than gear 2. All the four gears have module of 4 mm and pressure angle of 20°. Calculate the following: 1) The number of teeth, and pitch diameter of gear 2. 2) The tangential force between gears 1 and 2. acer 15 14 27°C Light

25EGSD Design TableV01 X 25EGSD Design TableVox esign TableV01 te.edu.sg/d2l/le/content/51876/topics/files/download/3378080/DirectFileTopicDownload Bi Appendix 1 - Dec 20 x 255EGSD-Appendix 1.0 X 25EGSD Design TableVol x + Automatic Zoom 3) The separating force and resultant force between gears 1 and 2. 4) The centre distance between gears 3 and 4. EDA, ESD1 (AT, AMS & ME) 80 Dec 2016 Common Test Official (Closed) - Non Sensitive 2.4 Shaft Assume forces acting on drum shaft is shown in the free body diagram Fig 2B. Given that the torque transmitted by the gear shaft is 581 Nm and the load is applied gradually, determine the shaft diameter (1st choice) assume commercial steel shaft and all components are keyed to the shaft. acer B K E 13 Q2.3 Total /16 For Markers Only A conveyor belt is d x Inl 27°C Light rai