Technical handbook for the paddy rice postharvest industry in ...

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62 POSTHARVEST INDUSTRY HANDBOOK3.26. Screw conveyortroughs. (top)3.27. Trough covers andclamps.waterproofing is essential, the flanged-hip roof cover is used. Screw cover clamps aremost often used with both types of covers.Drive arrangementsBecause most screw conveyors are operated at relatively low speeds and electricmotors operate at relatively high speeds, a speed reducer is essential. Drives can bedirect coupled, or belt or chain connected as shown in Figure 3.28.
63 CONVEYING3.28. Drive arrangementsfor screw conveyors: A,speed reducer mountedon conveyor shaft, motormounted with V belt connectionto slde or top; B,self-contained unit withstandard speed reducermounted on the shaft,motor attached and drivenby V belt; C, gear motorwith built-in speed reducer,chain drlve to screwshaft,3.29. Auger systems: A,portable; B, installed-inbin.Portable and bin augersThe previous section on screw conveyors provides design data on heavy-duty,continuous-operation screw conveyors, the type which would be used in a paddystorage-processing plant.In many small storage installations, however, it may be necessary to load andunload bins only a few times per year. This type of operation does not require thetype of screw conveyors just described. A number of manufacturers produce specialscrew conveyors for occasional use. They are generally known as augers. Figure 3.29shows portable augers A used on an incline to move paddy from a tractor-trailer intoa dryer and from the dryer into a storage bin, and a horizontal unloading auger Bunder the floor of a storage bin and a vertical auger to move paddy from the storagebin to a truck or into a rice mill. These light-duty augers (fewer operating hours peryear) are housed in lightweight closed tubes instead of an open U trough.Most often they are operated at higher rpm’s than those recommended forheavy-duty screw conveyors shown in Figure 3.22. Thus they achieve higher capacitiesthan small-diameter screw conveyors. Generally these augers are less expensive
Page 1 and 2: Chapter 3CONVEYINGIn the paddy post
Page 3 and 4: 47 CONVEYINGTypesBucket elevators a
Page 5 and 6: 49 CONVEYING3.6. Elevator discharge
Page 7 and 8: 51 CONVEYING3.7. Elevator head show
Page 9 and 10: 53 CONVEYING8.11. Boot section desi
Page 11 and 12: 55 CONVEYING3.15. Elevator with pla
Page 13 and 14: 57 CONVEYINGments vary with segment
Page 15 and 16: 59 CONVEYINGHorsepower requirements
Page 17: 61 CONVEYING3.24. Standard hangerbe
Page 21 and 22: 65 CONVEYINGWhen the auger is opera
Page 23 and 24: 67 CONVEYINGExample: Determine belt
Page 25 and 26: 69 CONVEYINGeither side of the belt
Page 27 and 28: 71 CONVEYING3.40. Self-aligning cam
Page 29 and 30: 73 CONVEYING3.44. Wing-type pulley.
Page 31 and 32: 75 CONVEYING3.47. Cross section ofc
Page 33 and 34: 77 CONVEYINGMost spouting is straig
Page 35 and 36: 79 CONVEYING3.54. Five-way distribu

Technical handbook for the paddy rice postharvest industry in ...

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