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

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64 POSTHARVEST INDUSTRY HANDBOOK3.30. Horizontal augerwith details: A, augerhousing, flighting, andstubs; B, intermediateflighting bearings; C, endplate with bearing: D, reductionunit; E, drive unit.(Courtesy of GT Augers)3.31. Distributing and unloadingaugers.than heavy-duty types and are more attractive to the operator who does not requirecontinuous heavy-duty operation. An example of a horizontal auger with details ofits components is shown in Figure 3.30. This type could be used either as anoverhead distributing auger or as a bottom unloading auger (Fig. 3.31). Capacitiesand operating rpm's for different size augers are shown in Table 3.7.Table 3.7. Capacities of light-duty augers.Auger diam(cm)Capacity(m 3 /h)OperatingrpmMinimum hp requirements for augersmeasuring8.5 m long 12.8 m long 18.6 m long15 35.4 450 3 520 42.5 218 5-7.5 7.520 70.8 370 – –25 84.9 205 – 10-152s 106.2 260 – –7.515–20–
65 CONVEYINGWhen the auger is operated in a vertical position, the capacity is greatly reduced.For example, when the 15-cm auger in Table 3.7 is operated vertically it has only 20m 3 /hour capacity at 620 rpm; the 20-cm auger, only 35.4 m 3 / hour capacity at 620rpm. Capacities vary with manufacturers.Portable augers are designed with the same type trough and screw flight constructionas the horizontal augers, but they need extra outside reinforcement because oftheir long lengths (Fig. 3.32). They are adjustable in height or angle to meet the needsof different size bins or dryers. They may be powered by electric motors or gasolineengines, or be driven by a tractor power takeoff. They are available in 15-cm, 20-cm,or 25-cm diameters. Their capacities vary considerably; for example, a 20-cm augeroperating at an angle of 20° may have a capacity of 70 m 3 / hour. But the same sizeauger operating at 45° may have a reduced capacity of only 50 m 3 / hour.Minimum electrical horsepower requirements could increase by 1/3 with wetpaddy if the same capacity in cubic meters per hour is maintained.Other portable augers are available in smaller diameters, in varying lengths, andfor different operational needs.BELT CONVEYORSA belt conveyor (Fig. 3.33) is an endless belt operating between two pulleys with itsload supported on idlers. It may be flat for moving bags of paddy, or V-shaped for3.32. Portable auger.(Courtesy of GT Augers)3.33. Typical belt conveyor.
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 and 18: 61 CONVEYING3.24. Standard hangerbe
Page 19: 63 CONVEYING3.28. Drive arrangement
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

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