SMALL FARM SUBSOILER

Transcription

1 SMALL FARM SUBSOILER final presentation USDA SPONSERED SENIOR DESIGN PROJECT Jason Lueck, Matt Maples, John McBride, Brad Mooney, Manuel Pagan

2 DESIGN REQUIREMENTS Scaled to work on a small farm. Low cost to purchase (under $3000 final cost) Able to penetrate at least 10 (15 preferred) Modify an existing tiller (Troy-Bilt Horse) Surface soil left undisturbed

3 Proposed Ideas Straight Straight Shank Rotary Rotary Chisel TrencherTrencher

4 Problems With Proposed Ideas Rotary Rotary Chisel More expensive than straight shank; Not feasible using the 8HP Troy-Bilt Horse (may be feasible with more powerful walk- behind tractors); TrencherTrencher Very expensive compared to other options; Slow forward speed; Least reliable;

5 Future Proposals for Rotary Chisel Hercules Series 850 Tractor Engine 14 HP Briggs & Stratton or 12 HP Kohler Transmission 3 Forward Speeds & 3 Reverse Speeds Max Tilling Width 30 Max Tilling Depth 8 8 $2950 Hercules Series 946 Tractor Engine 14 HP B&S Vanguard series Transmission 3 Forward Speeds & 3 Reverse Speeds Max Tilling Width 34 Max Tilling Depth 8 8 Approx. $4200

6 Reasons for Shank Shank Chisel Trencher Cost Least Expensive Expensive Most Expensive Ease of Design Least Design Work Most Design Work Some Design Work Safety Very Safe Least Safe Safe

7 Reasons for Shank Shank Chisel Trencher Maintenance Low Maint. Mid-range Maint. Most Maint. Reliability Most reliable Reliable Least Reliable Efficiency Least Efficient Comparable Comparable

8 Troy-Bilt HORSE

9 Troy-Bilt Physical Information Weight: Weight: 225 lbs. (without PTO attachments) Center Center of Mass Location: Horizontal: in Front of Axle Vertical: 7 7 Above the Axle Tires: Tires: Current: 15 Diameter Rubber Future: 18 Cage Wheels

10 Troy-Bilt Physical Information Center of mass location

11 Troy-Bilt Engine Information Engine Engine Specifications 8 HP Briggs & Stratton PowerBuilt Max torque: RPM s Max RPM: 3600 RPM s Continuous operation RPM: 3000 RPM s

12 Troy-Bilt Engine Information Torque Curve Torque (ft lbs) RPM torque curve

13 Troy-Bilt Engine Information HP vs RPM HP RPM Recommended Max

14 Troy-Bilt Transmission Information 2 2 x (2-Speed forward + Reverse) 2 Belt Settings From From Engine Shaft to Drive Shaft 2 Gear Speeds From From Drive Shaft to Axle Goes Goes Through a Worm Gear Before a Set of Helical Gears Reverse - Friction Plates Attached to Belt Pulleys

15 Troy-Bilt Transmission Information

16 Troy-Bilt Transmission Information Gear Ratios High Speed Belt Position 1 st Gear 216:1 2 st Gear 89:1 Low Speed Belt Position 290:1 120:1

17 Proposed Attachments to Shank With Coulter Large Coulter Disc Troy-Bilt HORSE

18 Proposed Shank Designs Raked Shank Curved Shank Straight Shank

19 Coulter Design Coulter Specs Diameter: 13.5 Cutting Depth: Bearings on Axle Adjustable Horizontal Positioning

20 Toolbar Design Toolbar Specs Length: 15 Material: 1.5 Square Tubing 0.25 wall thickness Adjustable Shank Angle Adjustable Shank Depth

21 Design Problems for Shank Avoiding Avoiding Adherence Loss SolutionsSolutions Add Cage Wheels Add Wheel Weights Add Weight to Front of Tiller

22 Design Solutions Add Weight to Front of Tiller

23 Cage Wheels and Wheel Weights Current Cage Wheels Will Be Modified Redesigned Hub Able to Carry Extra Weights Wheel Weights Regular Iron Lifting Weights Cheap and Available

24 Large Coulter Design Problem and Solution Inserting Inserting Coulter Disc into Ground Requires Approximately 400 lbs of Downward Force Solution: Solution: Add Large Weights Disc Assembly Weight: 100 lbs Weight Added to Toolbar: 300 lbs!

25 Large Coulter Disc Design Large Coulter Specifics Diameter: 36 Cutting Depth: 9 9 Moveable Toolbar Ease of Transport

26 Assumptions: Force Analysis Concentrated Load 15 Underground Only Shank (No Coulter) Steady-State State Operation (No Acceleration) h2 C2 h0 C0 W4 C4 W2 W0 C1 r α W1 Ph Sh hs c a b d Pv Sv h3 W3 h4 g

27 Engine s s Traction Force Traction force in high gear with rubber tires µ= 0.55 (rubber on dirt) and with cage wheels µ= (cage wheel on dirt)

28 Angle and Weight Changes Varying angle of operation between -10 and +10 degrees Weights: 180/80, 80/80, 80/180, 50 per wheel Cage wheels (µ=0.75)

29 Testing Needs Most Most available information is based on large scale equipment Small scale equipment information is estimated from large scale results Little Little known information on single shank forces Little Little known information on advantages of small leading coulter discs

30 Testing Options Strain Strain Gages Solid bar stock extension to toolbar Milled for higher elasticity Load Load Pins Replace bolts in toolbar with load pins

31 Testing Options Comparisons Strain Gages Less Accurate More setup work Calibration Attaching Gages Affordable (under $50) Load Pins Very Accurate Little setup work Data Collection Program Install as a Bolt Expensive ($750)

32 Project Cost Analysis Item Material Needed Quantity Cost Troy-Bilt HORSE -- 1 $0.00 Cage Wheels -- 2 $0.00 Cage Wheel Hubs.25" Steel 2 $0.00 Toolbar PTO Mount.25" Steel / 1" Solid Round 1 $0.00 Shank Toolbar 1.5" Square Tubing 2 $0.00 Curved Shank.375" Steel 1 $0.00 Raked Shank.375" Steel 1 $0.00 Straight Shank.375" Steel 1 $0.00 Angle Adjuster -- 1 $0.00 L-Bracket 2"x4"Tubing 1 $0.00 Front Weight Mount.25" Steel 1 $ lb. Weight -- 2 $ lb. Weight -- 4 $44.00 Small Coulter Disc -- 1 $0.00 Small CD Mount 2"x4"Tubing 1 $0.00 Large Coulter Disc -- 1 $0.00 Large Coulter Toolbar 1.5" Square Tubing 1 $0.00 Strain Gage Mount 1" Solid Square Stock 1 $0.00 Strain Gages -- 2 $30.00 Datalogger -- 1 $0.00 Raw Materials Amount Nuts, Bolts, etc $ " Steel Plate 2 sq. ft. -- $ " Steel Plate 8 sq. ft. -- $ " Square Tubing 8 ft. -- $ " x 4" Rect. Tubing 1 ft. -- $ " Square Stock Steel 1 ft. -- $ " Round Stock Steel 1 ft. -- $27.00 Total $ Load Pin* -- 1 $ * - optional

33 QUESTIONS