final presentation - watermelon juice extraction machine

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WATERMELON JUCE EXTRACTING MACHINE

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UGP 2016 - 04• Project Supervisor• Dr Indika Perera

• Group Members

• Jayathilaka R.M.N (EG/2012/1953)• Thennakoon T.M.M ( EG/2012/2092)• Peiris K.A.D.W.S ( EG/2012/2023)

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Background of the Problem• Tourism hotels and some fruit juice shops store readymade water

melon juice which are not fresh

• Extract watermelon juice without separating seeds

• When trying to remove seeds nutrious part also wasted

3 out of 29

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Aims and Objectives• Aims

To design and fabricate watermelon extracting machine

• ObjectivesPortable machineSmall in sizeRemove seeds and rindTime savingReduce energy consumptionLow cost

4Jayathilaka R.M.N. out of 29

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Design Process• Morphological Chart• Machine Concepts• Weighted Decision Matrix• 3D Model

Jayathilaka R.M.N. out of 295

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Morphological Chart

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Machine Concepts

Jayathilaka R.M.N. UGP2016-04 out of 297

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Machine Concepts

Jayathilaka R.M.N.

8 out of 29

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Weighted Decision Matrix Method Selection Criteria Machine Concepts Weights

Concept 1 Concept 2 Concept 3 Concept 4 Concept 5 Concept 6

R Score R Score R Score R Score R Score R Score

Handling Ease 4 0.8 5 1 4 0.8 4 0.8 2 0.4 3 0.6 20%

Seeds & Rind Removing

4 1 4 1 4 1 4 1 3 0.75 4 1 25%

Durability 4 0.4 4 0.4 3 0.3 2 0.2 3 0.3 5 0.5 10%

Portability 4 0.6 3 0.45 5 0.75 3 0.45 2 0.3 4 0.6 15%

Ease of Manufacture 4 0.6 3 0.45 2 0.3 2 0.3 2 0.3 4 0.6 15%

Dismantle & Cleaning 4 0.6 3 0.45 3 0.45 2 0.3 3 0.45 4 0.6 15%

Total Score 4 3.75 3.6 2.75 2.5 3.9

Rank 1 3 4 5 6 2

9 out of 29

Jayathilaka R.M.N.

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3D Model

10 out of 29

Jayathilaka R.M.N.

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CONCEPT TESTING

• In the fabrication process first we made a model of scraper using plastic scratch parts which can be bought from local market and validated conceptual design.

11 out of 29Peiris K.A.D.W.S.

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• We got 250ml approximately from design and manual methods as well from both half of watermelon

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CONCEPT TESTING

out of 29Peiris K.A.D.W.S.

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Fabrication

• we intend to manufacture scraper using plastic molding and 3D Printing but it is very expensive.

• Then we decide to manufacture it using stainless steel plates of gauge 24 (0.635mm).

13 out of 29Peiris K.A.D.W.S.

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FabricationBut then we encountered difficulties in Stainless Steel model Safety issues, Weight, Handling difficulties


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• we decided to fabricate the scraper using Perspex sheets to overcome the difficulties in Stainless Steel model.

Fabrication


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• We have fabricated the juice container using a transparent Perspex sheet. It is

a cylindrical container.

• The base frame of the machine was fabricated using ¾ inch mild steel box

bars.

Fabrication


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• The main rotating shaft was fabricated using one inch diameter nylon shaft. We also fabricated a pulley using 4” diameter nylon bar.• The motor used to power the machine is a 120W electric motor which

used to drive the pulley by a belt.

Fabrication


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Fabrication


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Test and Results

out of 29Tennakoon T.M.M.

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Test and Results


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Juice Extraction Raw Data Measured During the Manual Method

Test NoMass of

Fed Sample(g)

Mass of Juice Extracted(g)

Volume of Juice

Extracted(ml)

Mass of Residual Waste(g)

Juice Extraction

Time(s)

01 650 285 270 235 335

02 748 355 340 240 420

03 732 333 330 246 432

04 714 334 325 240 338


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Average Machine Performance Index during the Manual Method

Test No Juice Yield Extraction Efficiency Extraction Loss

Juice Extraction Capacity

01 54.81 43.85 20 0.81

02 59.66 47.46 20.45 0.81

03 57.51 45.49 20.90 0.76

04 58.19 46.78 19.61 0.96


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Test No Mass of Fed Sample(g)

Mass of Juice Extracted(g)

Volume of Juice Extracted(ml)

Mass of Residual Waste(g)

Juice Extraction

Time(s)

01 761 357 350 280 300

02 658 307 270 229 225

03 743 370 360 249 219

04 756 354 350 264 256

Juice Extraction Raw Data Measured during the Evaluation of the Prototype


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Test No Juice Yield Extraction Efficiency Extraction Loss

Juice Extraction Capacity

01 56.04 46.91 16.29 1.17

02 57.28 46.66 18.54 1.20

03 59.77 49.80 16.69 1.64

04 57.28 46.83 18.25 1.37

Average Machine Performance Index during the Evaluation Prototype


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Comparison between manual and Prototype

Test

Juice Extraction Capacity Juice Yield% Extraction Loss Extraction Efficiency

(

Manual Prototype Manual Prototype Manual Prototype Manual Prototype

1 0.81 1.17 54.81 56.04 20 16.29 43.85 46.91

2 0.81 1.20 59.66 57.28 20.45 18.54 47.46 46.66

3 0.76 1.64 57.51 59.77 20.90 16.69 45.49 49.80

4 0.96 1.37 58.19 57.28 19.61 18.25 46.78 46.83


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0 1 2 3 4 50.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

Juice Extraction CapacityJuice Extraction Capacity-Prototype Juice Extraction Capacity-Manually

Sample No

Ext

racti

on C

apac

ity


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0 1 2 3 4 50.00

5.00

10.00

15.00

20.00

25.00

Percentage of Extraction LossExtraction Loss-Prototype Extraction Loss-Manually

Sample No

% E

xtra

ction

Los

s


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0 1 2 3 4 540.00

42.00

44.00

46.00

48.00

50.00

52.00

Percentage of Extraction EfficiencyExtraction Efficiency-Prototype Extraction Efficiency-Manually

Sample No

% o

f Ex

trac

tion

Effici

ency



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CONCLUSION AND FUTURE WORK

• According to the Background of the problem section we designed this machine to be used for Small Scale Business.

• There is no proper machine to extract watermelon juice in a small scale business.

• This machine is designed to operate with a high torque motor.


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• This machine was designed in a way it use a scraper to scrape the flesh and separate seeds and rind then extract the juice under gravity. The scraper is rotated using a motor.• We hope to develop blades to new sizes, angles and types to increase

efficiency • We hope to complete and test the machine to find the efficiency and

develop to get the maximum efficiency. • We hope to develop and sell this machine to between Rs.3000/- and

Rs.5000/ .

CONCLUSION AND FUTURE WORK


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THANK YOU

final presentation - watermelon juice extraction machine

Engineering