International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
DEVELOPMENT AND PERFORMANCE OF HUMAN POWERED
MINI PADDY HARVESTER
Prof. Vivek R. Gandhewar1, Prof. Sachin M. Moghe2 , Abhilash R. Sannyal3 , Pranit B. Ragit4
1
AssociateProfessor, Mechanical Engineering Department, J.D.I.E.T. Yavatmal(M.S) India,
[email protected]
2
Assistant Professor, Mechanical Engineering Department, J.D.I.E.T. Yavatmal(M.S.),India,
[email protected]
3
B.E. Final Year, Mechanical Engineering Department, J.D.I.E.T. Yavatmal(M.S.),India,
[email protected]
4
B.E. Final Year, Mechanical Engineering Department, J.D.I.E.T. Yavatmal(M.S.),India,
[email protected]
_____________________________________________________________________________
ABSTRACT
This paper addresses the development and performance of human powered mini paddy harvester.
We developed a mechanism for harvesting of mini paddy so that we get easy harvesting in minimum period of
time. This set up is used to cut the crop residues like wheat, rice, etc. which helps formers. Also this set up
uses the manpower of labor through pedaling mechanism which is provided with different gear, chain,
flywheel and pulley mechanisms which results in transmission of this manual motion into rotary motion of
cutter at the end which cuts the crops because of which the crops get cut easily without any hard effect.
Keywords: human power, harvesting machine, crop residues
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1.INTRODUCTION
Mechanization of farm operations has been pursued vigorously by both private and government
organizations to improve the production of various crops. The mechanization of mini paddy harvesting is not
an exception in this regard. Harvesting was notoriously labour intensive, and the need to provide a labour to
harvest crops, in a great measure, lead to the development of harvesting process. Presently, The cutting process
with the help of hand operated cutter is characterized by slow operation, fatigue and low production rate. Also
it is facts that hand muscles are weaker than leg muscles. It is necessary to apply human power in such a way
that drudgery is minimized by applying concept of human powered mini paddy harvesting machine.
Ordinarily, pedaling a stationary bicycle is a form of exercise performed for pleasure or to keep fit. It is
gratifying if during such exercise the much needed power is also being supplied for cutting.
2. WORK LAYOUT OF PRACTICAL ARRANGEMENT
The work layout shows the arrangement of different parts of project. It consists of different parts including
two flywheel, rim, v-belt (A = cross section), cycle sitting arrangement, cutter, cutter supporting handle, battery,
motor, alternator, chain drive, etc. For easy analysis and study of these arrangements, we classified it into three
sections as follows: (1) Cycle arrangement (2) Power transmission arrangement (3) Cutting arrangement.
Fig-1: Work layout of practical arrangement
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International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
The above three sections of this project can easily describe the project function. The input is given to the cycle
arrangement through pedaling mechanism. The output of 1st section is then given to the input of power
transmission section which includes battery and alternator. Then the output of this power transmission
arrangement is given to the cutter mechanism arrangement which rotates the cutter and harvesting can be done.
The whole process is simple mechanism, needs two members/persons to work at a time in a continuous manner.
This arrangement may help in different branches and areas for the different tasks.
3. PRACTICAL ARRANGEMENT OF DIFFERENT SECTIONS
3.1 Cycle sitting arrangement section
This is the first and very important part of this arrangement. It consists of a structure simply like a
bicycle. The comfortness of handling of work depends on this section. This arrangement of cycle structure is
fitted on the span of base at one end. The two views of this arrangement are as shown in figure, i.e., front view
and side view respectively. This section includes pedaling mechanism having chain mounted on gear.
Fig-2: Cycle sitting arrangement
(a) Sitting arrangement: The sitting arrangement is as shown below. It is same as like as simple bicycle.
The comfortness of handling of this mechanism depends on arrangement of seat.
(b) Pedal: This is the part of cycle structure used for pedaling. By keeping foot of labor on it, pedaling can be
done easily.
(c) Chain drive: The chain drive is the second part of this arrangement. The diagrammatical figure is shown
below:
(d) Flywheel and shaft arrangement: It consists of two gears (2) and (3) described previously on a
uniform shaft (solid) fitted on the arrangement on a horizontal position. Two flywheels are also mounted over it
on its two ends as shown in figure:
3.2 Power transmission system
The power transmission system contains alternator, battery, etc. These are the important components as
the efficiency of mechanism depends on the efficiency of power transmission system.
(a) Alternator: An alternator is an electrical generator that converts mechanical energy to electrical energy in
the form of alternating current.
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International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
Fig.-3: Alternator
e-ISSN: 2394-8299
p-ISSN: 2394-8280
Fig.-4:.Battery
For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.
From the experimental performance, we observed that the alternator requires continuous pedaling of 3 hours to
produce 7A current. Alternator can supply upto 30A and 12V.
(b) Battery: An electric battery is a device consisting of one or more electrochemical cells that convert stored
chemical energy into electrical energy. Each cell contains a positive terminal, or cathode, and a negative
terminal, or anode. The specifications used for battery were 12V and 7A.
3.3 Cutter Mechanism:
Fig-5 : Motor cutter assembly
The cutter assembly is also an important parameter because the main output of mechanism mainly depends on
the cutter mechanism components, i.e., wire, blade, rod size, etc.
(a) Motor: An electric motor is an electrical machine that converts electrical energy into mechanical energy.
The efficiency of mechanism mainly depends on it because there may be several losses occurred in motor. The
performance of motor gives the performance evaluation criteria for the output of mechanism. The specifications
used for motor were DC series 12V, 80W, 6.66A and 10000 rpm.
(b) Blade: The cutter blade is the cutting device which is having cutting teeth on its periphery. For the
toughness of cutting mechanism, they may use tip of carbide metal. We use the blade of stainless steel of having
diameter of 150 mm and no. of teeth is 40.
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International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
4. WORKING PRINCIPLE
Fig-6 : Battery charge unit with pedaling mechanism
The human powered mini paddy harvester is the simple mechanism having components as described
above. It consists of three section i.e. cycle sitting arrangement section, power transmission section and cutter
assembly section. The kinetic energy of human pedal power is utilized in pedaling mechanism .These kinetic
energy is transferred to power transmission mechanism through V-belt, gears and rim as described briefly
above.
This gear arrangement is provided on a shaft on which two flywheel are also mount to balance the
unbalancing and to provide the necessary effort when required. Then the output of power transmission
mechanism is attached with alternator which converts mechanical energy into electrical energy. A battery is
attached to the alternator for the storage of current in battery. The output of battery is then given as the input of
cutter assembly mechanism which contains cutter blade, motor, wire, switch and a simple rod to support to the
cutting blade. The electrical energy from battery is provided to the cutter blade through wires which revolves the
cutter and we get harvesting of crop.
5. PERFORMANCE PARAMETERS
(a) Gear ratio: For the easiness of operator, it is necessary to reduce the harness effect of vibration and jerk at
the process unit shaft. Hence we used the gear ratio of 4:1 as the suitable one to reduce the effect of jerk induced
at process unit shaft as result of energy or momentum exchange during the clutch engagement. If lower value of
gear ratio is to be used then flywheel speed should be maintained higher than 240 rpm [5].
(b) Flywheel size and Moment of Inertia: In the mechanism having flywheel meshed arrangement, the
size of the flywheel and its moment of inertia also plays the vital role in the terminal velocity of flywheel.
Modak J.P (1987) during the experimentation has observed that for the average person of 165 cm stature from
age group 20-24 years maximum thigh oscillation is 40. [4]. Therefore from the observation of above results we
consider the average rate of revolution is 50rpm.
6. DIMENSIONING
No.
Name of component
Dimensions
Material
1.
Flywheel shaft
Mild steel
2.
Flywheel (major)
3.
Flywheel (minor)
4.
Sprocket
Length = 620 mm,
Diameter = 25 mm
Diameter = 230 mm,
Weight = 7.8 kg
Diameter = 210 mm,
Weight = 7.3 kg
No. of teeth = 48
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Cast iron
Cast iron
Mild steel
International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
5.
Freewheel
No. of teeth = 18
Mild steel
6.
Gear
No. of teeth = 24
Mild steel
7.
Cutter
Stainless steel
8.
Bearing
Diameter = 150 mm,
No. of teeth = 40
Flywheel shaft
Table 1: Dimensions of various components
7. FINAL ASSEMBLY
Fig-7: Front view of project assembly
Fig-8: Side view of project assembly
Fig-9: Cutter mechanism working assembly
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Stainless steel
(205 UPC)
International Journal of Research In Science & Engineering
Volume: 1 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
8. CONCLUSION
In countries like India where ample human power is available, such human powered man machine
systems will help to a great extend to improve the economical condition and employability of such countries. A
new type of mechanism is fabricated which unlike other fodder cutting machines will work on non conventional
energy source. Such systems are of utmost importance in Asian countries as almost all Asian countries are
facing electricity scarcity which results in ten to twelve hours load shedding in rural areas.
ACKNOWLEDGEMENT
The authors would like to thank Dr. A. B. Borade (HOD of mechanical department, JDIET,
Yavatmal) for their time to time supports and guidance.
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