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Belt conveyor

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Belt conveyor

  1. 1. A Seminar on topic BELT CONVEYOR PRESENTED BY- ALOK KUMAR MISHRA DEPTT. OF MINING MACHINERY ENGG.
  2. 2. CONTENT  Introduction  Main elements of belt conveyor  Aspects of belt conveyor design  Working of belt conveyor  Advantages of belt conveyor  Disadvantages of belt conveyor  Maintenance procedures  Bibliography
  3. 3. INTRODUCTION  A belt conveyor is a bulk material handling equipment.  It transports bulk materials over long distances and over terrains requiring a wide range of paths of travel.
  4. 4. MAIN ELEMENTS OF BELT CONVEYOR  BELT  IDLERS  PULLEYS  DRIVE UNIT  SUPPORTING STRUCTURE
  5. 5. ASPECTS OF BELT CONVEYOR DESIGN  CHECKING/DETERMINING CAPACITY OF A BELT CONVEYOR,  CALCULATING MAX. BELT TENSION REQUIRED TO CONVEY THE LOAD,  BELT SELECTION,  SELECTION OF DRIVING PULLEY,  DETERMINATION OF MOTOR POWER,  SELECTION OF IDLERS AND ITS SPACING.
  6. 6. CAPACITY OF BELT CONVEYOR  It mainly depends upon- -Area of cross section of coal load on belt -Speed of belt  Based on uniform feed to the conveyor, local cross section area (A0) is- A0 = 𝑘𝐵 𝐵 − 0.1 + 0.11𝐵2tan 𝛼 where, B- Belt width, 𝛼- Surcharge angle k- It’s a constant varies with trough angle .
  7. 7.  Capacity equation Q = 3600A0. 𝜌.V.K1 where, 𝜌 −bulk density (ton/m3) K1- A reducing factor on inclined and declined conveyor.  Value of reducing factor decreases as the inclination angle increases.
  8. 8. MAXIMUM BELT TENSION  The limiting ratio of tensions when slip is about to occur P1 P2 =eμθ Where, P1- Bigger tension in top strand P2- Lower strand tension Θ- Angle of wrap μ- Coeff. Of grip or friction
  9. 9. BELT SELECTION CRITERIA  All belt conveyors for bulk materials use rubber-covered conveyor belts made of a woven carcass having strength enough to pull and support the load.  Rubber cover protects it from being damaged.  Types of belts according to application - Conventional belting - Steel cable belts - Heat service belts
  10. 10. FACTORS INFLUENCING BELT SELECTION  Required belt tension requirements  Length and speed of conveyor  Abrasiveness of material handled  Size of lumps and their tendency to cut or tear the cover  Method of loading conveyor
  11. 11. PULLEY DIAMETER SELECTION  Pulley diameter depends on thickness of belts used or for surface installation no. of plies used in belt. Pulley dia. (Dp) = K.i where, i- no. of plies (2-12) or thickness in mm. K- 120-150 for stationary surface conveying, 80-100 for main trunk conveying 65-80 for gate conveyor 50-65 for tail drive
  12. 12. POWER REQUIREMENT Total Power is summation of  Power to move empty belt,  Power to move load horizontally,  Power to move load vertically. 𝑃 = [𝐾2.(L+45)B.V]+[L. Q ∗ 10−4]+[28Lsin θ.Q∗ 10−4] kw Where, K2-coefficient which depends on equivalent mass of idlers & mass of belt type selected for job. Θ-Belt inclination.
  13. 13. IDLERS AND ITS SPACING  Idlers are used to protect and support the belt and load to be carried.  The spacing of idlers on the loaded run depends on bulk weight of material and width of the belt. (1.2m-1.5m) for < 1ton/m3 (1.1m-1.4m) for > 1 ton/m3
  14. 14. WORKING OF BELT CONVEYOR SYSTEM
  15. 15. ADVANTAGES OF BELT CONVEYOR  Silent continuous transport.  Require less manpower.  Less accident prone.  Require simple arrangements both at loading & unloading ends.  Multipoint loading is convenient.  Energy efficient compared to other means of transport because of high pay load to total load ratio.  Less prone to breakdowns.
  16. 16. DISADVANTAGES OF BELT CONVEYOR  A separate arrangement for material handling is required.  Hot material can not be transported by belt conveyor.  Vertical transport can not be done by belt conveyor.
  17. 17. MAINTENANACE PROCEDURES  Rubber or metal bladed wipers located on or near the head pulley of the conveyor provide adequate cleaning and economical construction.  Sometimes water spray, compressed air or fixed or power driven revolving brushes are used.  Tramp iron can be removed from materials carried on belt conveyors by either permanent or electromagnetic pulleys.
  18. 18. BIBLIOGRAPHY  Material handling handbook vol.2 by Raymond A. Kulwiec  Mechanics of bulk material handling by Norman Brook  www.conveyorsystemmanufacturer.com  www.Wikipedia.com
  19. 19. Thank You

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