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Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
Design and analysis of screw conveyor
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Design and analysis of screw conveyor

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Design and analysis of screw conveyor

Design and analysis of screw conveyor

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  • 1. Institute of Technology, NIRMA UNIVERSITY1 Design and Analysis of Screw Conveyor Presented by : Gandhi Keyur(08MME004) M.Tech (CAD/CAM) Guided by : Dr. D. S. Sharma
  • 2. Institute of Technology, NIRMA UNIVERSITY2 Outline of Presentation • Introduction to Screw Conveyor • Major Screw Conveyor Components • Types of Screw Flight • Types of pitch • IS code using for designing • Design of screw conveyor • Matlab program for screw conveyor design • Modeling of screw conveyor – Exploded View of Screw Conveyor • Powder property and screw conveyor capacity • Effect of vortex motion on the Volumetric Performance of Enclosed Screw Conveyors • System for Conveyor Equipment Selection • Future Work of Project • References
  • 3. Institute of Technology, NIRMA UNIVERSITY3 Introduction to screw conveyor • Screw conveyors are widely used for transporting and/or elevating particulates at controlled and steady rates. • They are used in many bulk material applications in industries ranging from industrial minerals, agriculture (grains), pharmaceuticals, chemicals, pigments, plastics, cement, sand, salt and food processing. • They are also used for metering (measuring the flow rate) from storage bins and adding small controlled amounts of trace materials such as pigments to granular materials or powders.
  • 4. Institute of Technology, NIRMA UNIVERSITY4 Major Screw Conveyor Components: • Hopper or Bin • Stationary screw casing (tubular, open or covered trough) • Rotating screw.
  • 5. Institute of Technology, NIRMA UNIVERSITY5 Types of Screw Flight
  • 6. Institute of Technology, NIRMA UNIVERSITY6 Types of pitch Standard Full Pitch P/D = 1 Used for conveying material horizontally or on slight inclines. Half Pitch P/D = 0.5 Used in screw feeders, also in conveyors where material is being conveyed up an incline. Double Flight Full Pitch P/D = 0.25 Used in conveyors where an even discharge of materials is required. Ribbon Used in conveyors to convey sticky materials.
  • 7. Institute of Technology, NIRMA UNIVERSITY7 Cut Used in conveyors where mixing materials is desired. Cut and Fold Used in conveyors where high levels of mixing materials and increased retention time is desired. Varied Pitch Used in screw feeders, short pitch below inlet, full pitch beyond to allow material loading to drop. Cone with Consistent Pitch Used in screw feeders where an even loading across the inlet length is desired. Cone with Varied Pitch Used in screw feeders where a specific loading across the inlet length is desired.
  • 8. Institute of Technology, NIRMA UNIVERSITY8 IS code using for designing • IS 5563 :1985 Screw conveyor for industrial use • IS 13324 :1982 Screw Feeders • IS 12960 :1990 Determination of power requirement of screw feeder – general requirement
  • 9. Institute of Technology, NIRMA UNIVERSITY9 Design calculation • Q = V.ρ = 60 ∏/4 D2 .S.n.ψ.ρ.c – V = volumetric capacity (m3 ) – ρ = Bulk Density of the material (kg/m3 ) – D = nominal diameter of screw conveyor(m) – S = screw pitch (m) – N = R.P.M. of screw – Ψ= loading efficiency of screw – C = factor to take into amount the inclination of screw conveyor
  • 10. Institute of Technology, NIRMA UNIVERSITY10 Matlab program for screw conveyor design • Q = input('Enter the capacity of conveyor in tons / hour : ') • th = input('Enter the inclination of conveyor degree : ') • if th>=0&&th<5 • inclinationfactorC=1 • elseif th>=5&&th<=9 • inclinationfactorC=.9 • elseif th>=10&&th<=14 • inclinationfactorC=.8 • elseif th>=15&&th<=19 • inclinationfactorC=.7 • elseif th==20 • inclinationfactorC=.65 • else • inclinationfactorC=.5 • end • Length = input('Enter the length of conveyor in metres : ') • Bulk_Density = input('Enter the Bulk Density of conveying material in kg/cubic metre : ') • conveying_material = input('Enter the type of conveying material n press 1 for abresive,n press 2 for midly abresive and n press 3 for non abresive and free to flow : ')
  • 11. Institute of Technology, NIRMA UNIVERSITY11 Matlab program for screw conveyor design • switch conveying_material • case 1 • progress_resistance_coefficient = 4 • loading_efficiency = 0.125 • %fprintf('loading efficiency of conveying material is=%fn',loading_efficiency) • case 2 • progress_resistance_coefficient = 2.5 • loading_efficiency = 0.275 • %fprintf('loading efficiency of conveying material is=%fn',loading_efficiency) • case 3 • progress_resistance_coefficient = 2.5 • loading_efficiency = 0.425 • %fprintf('loading efficiency of conveying material is=%fn',loading_efficiency) • • otherwise • disp('Unknown conveying_material ') • end • Pitch_to_Diameter_Ratio = input('Enter the Pitch to Diameter Ratio of conveyor between 0.75 to 1.0 :') • speed = input('Enter the speed of conveyor in RPM :') • diameter_of_conveyor = ((Q*4)/ (22/7*60*Pitch_to_Diameter_Ratio*speed*loading_efficiency*Bulk_Density*inclinationfactorC))^(1/3) • fprintf('diameter_of_conveyor =%f metren',diameter_of_conveyor) • power_req = Q/367*progress_resistance_coefficient*Length + Length * sin(th*3.14*2) + (diameter_of_conveyor * Length)/20 • fprintf('power_req = %f kilowatt n',power_req)
  • 12. Institute of Technology, NIRMA UNIVERSITY12 Matlab run program • Enter the capacity of conveyor in tons / hour : 50 • Q = • 50 • Enter the inclination of conveyor degree : 15 • th = • 15 • inclinationfactorC = • 0.7000 • Enter the length of conveyor in metres : 25 • Length = • 25 • Enter the Bulk Density of conveying material in ton / cubic metre : 1.6 • Bulk_Density = • 1.6000 • Enter the type of conveying material • press 1 for abresive, • press 2 for midly abresive and • press 3 for non abresive and free to flow : 1 • conveying_material = • 1 • progress_resistance_coefficient = • 4 loading_efficiency = 0.1250 Enter the Pitch to Diameter Ratio of conveyor between 0.75 to 1.0 :1 Pitch_to_Diameter_Ratio = 1 Enter the speed of conveyor in RPM :50 speed = 50 diameter_of_conveyor = 0.5331 diameter_of_conveyor =0.533112 metre power_req = 13.0963 power_req = 13.096333 kilowatt Ans : Diameter = 533 mm Power req. = 13.KW For 50 ton/hour output capacity
  • 13. Institute of Technology, NIRMA UNIVERSITY13 Modeling of screw conveyor
  • 14. Institute of Technology, NIRMA UNIVERSITY14 EXPLODED VIEW OF SCREW CONVEYOR
  • 15. Institute of Technology, NIRMA UNIVERSITY15 Powder property and screw conveyor capacity • Coarse powders will flow into the screw easier than fine powders. • The screw capacity will also be higher if a dense powder is used. • Particle with a round shape have lower internal friction that results in a greater screw capacity. • The clearance and the free length of the intake have a big influence on screw capacity. • No correlation between conveying length and conveyor capacity was found.[1]
  • 16. Institute of Technology, NIRMA UNIVERSITY16 Effect of vortex motion on the Volumetric Performance of Enclosed Screw Conveyors • Vortex motion arises as a result of internal friction, friction between the granular material and surface of the helical blade. • The vortex motion, together with the degree of fill govern the volumetric efficiency. [2] • = Rotational or vortex efficiency • = Fullness Efficiency = • = Average height of material on the screw surface.
  • 17. Institute of Technology, NIRMA UNIVERSITY17 System for Conveyor Equipment Selection • The system provides the user with a list of conveyor solutions for their material handling needs along with a list of suppliers for the suggested conveyor devices. • Conveyor types are selected on the basis of a suitability score, which is a measure of the fulfillment of the material handling requirements by the characteristics of the conveyor. • The Expert System(ES) approach to conveyor selection provides advantages of unbiased decision making, greater availability, faster response, and reduced cost as compared to human experts. • The computation of the score is performed through the Weighted Evaluation Method
  • 18. Institute of Technology, NIRMA UNIVERSITY18 Conveyor category selection screen [3]
  • 19. Institute of Technology, NIRMA UNIVERSITY19 Attribute importance specification screen [3]
  • 20. Institute of Technology, NIRMA UNIVERSITY20 FUTURE WORK OF PROJECT • Design of screw conveyor. • Programming of screw conveyor design • CFD analysis of screw conveyor. • Prediction of screw conveyor performance at different operating condition. – The rotational speed of the screw. – The inclination of the screw conveyor. – The volumetric fill level of the bulk material.
  • 21. Institute of Technology, NIRMA UNIVERSITY21 References 1) Alma Kurjak ,The vertical screw conveyor- powder properties and Screw conveyor design , SE-221 00 Lund ,Sweden January 2005. 2) A.W. Roberts, The influence of granular vortex motion on the volumetric performance of enclosed screw conveyors, Callaghan NSW, 2308, January 1999. 3) Daniel J. Fonseca*, Gopal Uppal, Timothy J. Greene, A knowledge-based system for conveyor equipment selection, Elsevier 26 (2004) page no. 615–623. 4) Jianjun Dai, John R. Grace, Biomass screw feeding with tapered and extended sections, Powder Technology 186 (2008) 56–64, Elsevier 5) W. McBride, P.W. Cleary, An investigation and optimization of the ‘OLDS’ elevator using Discrete Element Modeling, Powder Technology 193 (2009) 216–234, Elsevier 6) T. K. Ray, Mechanical handling of materials 2004,92-105

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