automatic farm gate interegr 160 instructor: prof. john murphy sa: brandon dudley december 12, 2006
TRANSCRIPT
Automatic Farm Gate
INTEREGR 160Instructor: Prof. John MurphySA: Brandon DudleyDecember 12, 2006
Outline
Background Problem Statement Gantt Chart Brainstorming Preliminary Designs Evaluation
Integrated Design Construction &
Materials Testing Budget Alternative Design Summary
Background Information
Mark Novak and AgrAbility Project America’s aging farming populations need
labor-saving devices to assist their everyday task
Currently, farm gate must be opened manually after exiting a vehicle
Current products in the market are unsatisfactory (expensive and must be bought as a package with a new gate)
Problem Statement
Our goal is to design an automated gate to meet the needs of the aging and disabled farming population. The gate will be remotely opened and closed to reduce the amount of physical labor required to operate the gate. We will be providing the farmers with a safer, inexpensive, and reliable system that can be easily constructed and operated
Timeline – Gantt Chart
Brainstorming – Small Group and Big Group
Sliding gate Swinging gate Drop down gate Flip down gate Lamborghini (pivot)
gate Double swinging gate Wheeled gate Rotating gate
Solar powered Pulley system Gear motored Screw drive powered Magnetic lock Ground switch Rechargeable battery Rotary powered Gates of fire
Brainstorming Continues…
Preliminary Small Teams’ Design
Screw drive powered sliding gate
Sliding gate powered by spring loaded wheels
Rack and pinion sliding gate
Geared power swinging gate
Evaluation Criteria
Safety Durability Reliability Accessibility Simplicity
Cost Time Serviceability Adaptability Manual Operation
Integrated Design & Prototype
A swinging gate powered by a motorized wheel attached to the gate
Motorized wheel bought from Tecel Spring loaded shock system attached to the wheel to
accommodate rough terrains A solenoid powered latch ½ scale prototype (3 ft x 8 ft) Radio receiver and transmitter to apply power and
switch direction of motor
Material & Budget Breakdown
PVC’s (Home Depot) – Total: $27.63– 5 - 10 ft, 1 inch PVC pipes– 4 - 1 inch L connectors– 8 – 1 inch T connectors– 3 – 1 inch X connectors
2 Gate Hinges (Ace Hardware): $10– Gate attachment– Support attachment– 6 Bolts (3/8 inches course)– 2 nuts (3/8 inches course)
Nuts & Bolts (Ace Hardware): $18.17– 4 guidance bolts– 2 stabilizer bolts– 1 threaded U bolt– 8 nuts– 8 washers– 3 fine thread bolts
Material & Budget Breakdown cont.
Tubular Solenoid, Pull Type, 1.00” (25 mm) DIA X 2.00” (51 mm) L; 12 DC volts; continuous cycle (ElectroMechanicsOnline): $47.82
2 Channel Rolling Code RF Remote and Receiver (Car’s Electronics): $45.00 Continuous – Length Compression Springs (McMaster – Carr): $14.51 –
UNUSED 2 Way Lockable Gate Latch (Northern Tool + Equipment): $27.53 – UNUSED Motorized Wheel 7 inches diameter (TECEL): $48.00 Radioshack Electrical Supplies: Total $22.96
– 2 DPDT 10Amp 12 VDC Relays– ½ Amp Slow Blow Fuse– 5 Amp Slow Blow Fuse
2 Kill Switches (Amazon.com): $9.98 – UNUSED Battery Latches assembly
– 1 – 1” washer– 1/8” x ¼” x 4 3/8” metal bar
Wheel Attachment Aseembly– 3 metal plates– 1 spring 2 inches diameter
Total Budget
Total spent: $271. 60
Total used on prototype: $219.57
Theoretical budget for user: ~ $100.00 - $200.00*
*Battery sold separately
Constructions
Order of materials PVC gate construction Spring loaded shock system construction Attachment of motorized wheel to the shock
system Development of electrical details Development of latching mechanism Full assembly
Prototype
Latch Design
Wheel’s Detail
Electronics
Powered by 12V automobile battery Two channel radio transmitter/receiver Radio signals activate relays, allowing
current to power the motor and latch Signal 1 trips relay 1, allowing current to flow
in one direction Signal 2 trips relay 2, allowing current to flow
in the opposite direction
Design’s Advantages
Only simple modification needed to be done on the existing gate
Less chances of physical injury (compared to gear or pulley system)
Works in various terrains Can be manually opened in case of power
outage Only require small power (enough to be
powered by a battery)
Testing
Preliminary computations to prevent later problems
Testing on the remote control system Testing on the locking mechanism Testing on the strength of the wheel Testing on the shock system Testing power source and other electronic
components
Alternative Design & Adaptation
Larger wheels will be needed for full-scale gate
Improvement on the locking mechanism (stronger solenoid)
Alternative spring loaded shock system (suspension system)
Extensive weather and terrain factorization
Special Thanks To:
Prof. John Murphy Our SA: Brandon J. Dudley SA Amit Nimunkar Burke O’Neal Countless efforts of fellow team members COE Student Shop
Questions?