AN-NAJAH NATIONAL UNIVERSITY FACULTY OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING

Automatic Orange Juicer JONSON Supervisor : Dr. Mohammad Abu Helal Students: Ashraf Adnan Tareq Msameh

The project in words Group of mechanisms aims to make the operation of making orange juice easier and more rapidly

ABSTRACT Our project is an orange juicer which can by itself and its design separate the orange pieces and cut them after that squeeze them before it finally through them out, all of that by a special design During our project, the project itself will be passed through three stages, soft ware design by using AUTOCAD and MECHANICAL DESKTOP programs, wooden and cartoon model and finally the final model made by steel ,plastic and aluminum apparatus.

The Safety All the analysis and calculations will be shown, To prevent any damages or bad work when the machine work on. Safety for the human who used this machine. Automatic switch door will add. A safety bottom added too and it has been but in special place that can easier to reach.

Description of Our Model Have a normal size about (55×35×160) cm. Automatically movement. Juice an oranges with diameter about ((65 mm < d < 90mm)). Squeezing, cut and throw away by it self. Squeezed more than twenty pieces per minute. Can juice more than 80% of orange piece.

Work Plan Maximum time(about 50 days) was in operation 7 which related to software design of the model

The Parts Of Project gear1, gear2 and chain A Motor

Beams Beam #2 Beam #1 Beam #3

A knife (fixed on the plate)

The Press (dimension and drawing)

Rod and Special mechanism

Dome of the juice

Cover of the machine Orange path

Analysis’s Analysis Of Orange Pieces: by collect information and made experiments we found that the minimum diameter of orange 65 mm and maximum diameter is 90 mm

Ultimate strength (MPa) Thermal conductivity W/(m·k) Materials Analysis material Density Kg/m3 Yield strength (MPa) Ultimate strength (MPa) Thermal conductivity W/(m·k) Poisons ratio stainless steel 2.7 400 455 237 (pure) 120—180 (alloys) .33 Aluminum 6.4 520 860 12.11 ~ 45.0 .30 - .31 Steel 7.8 690 760 15 - 50 .27 - .30

Springs Analysis Spring #1 analysis of spring # 1 Force(n) Elongation(cm) 1 1.4 1.5 3.2 2 3.9 2.5 4.4 3 4.7 3.5 5 4 5.1 Spring #1 analysis of spring # 1

Experimental stiffness Springs properties Experimental stiffness Number of turns Final length D coil d wire Initial Length Spring number .724 25 9 7 .8 3.8 spring #1 1.07 29 3.9 Spring #2 .9 20 11 6 3.7 Spring #3

Theoretical design for all springs From those two equations we find that K= .5N/cm spring 1 load which cause permanent deformation Sy= .55(Sut) Ssy= .35(Sut) and C= KB=

Springs properties Springs properties Spring # L o (cm) Max deflection(cm) Nt d mm D mm Max length cm Max force N Real force Factor of safety 1 3.8 5 25 .8 7 9 8.9 5.6 1.5 2 3.9 4.5 29 10.3 7.8 1.32 3 3.7 20 .5 6 11 6.4 3.2 Springs properties

Load needed for Cutting Orange Piece Static load (Weight)(gram) Cut percentage % 1100 No cut 1200 1300 1400 6% 1500 15% 1600 25% 1700 40% 1800 50% 1900 60% 2000 70% 2100 80% 2200 100% Weight dropped (gram) Cut percentage % 1000 No cut 1100 1200 1300 1400 1500 20% 1600 35% 1700 60% 1800 80% 1900 100% 3.3 kg, 32.4 N by taking 1.5 factor of safety 2.85 kg , 27.9 N by taking 1.5 factor of safety

Load Needed For Squeeze The Orange Pieces WEIGHT (g) Squeeze percentage (%) 2500 No squeeze 2700 3000 5 3200 9 3400 15 3500 19 3700 25 3900 30 4100 35 4300 40 4500 42 4200 45 4400 50 4600 55 4800 58 5000 60 5200 65 5400 70 5600 75 5800 80 6000 82 6200 85 6400 88 6600 90 6800 95 7000 97 F needed=(200 N)

Gears Analysis The ratio between the two gears we have :- This mechanism (the two gears and the chain) used to reduce the angular velocity to which we need , so the velocity of the motor reduced from 72rev\min to 27 rev\min

Analysis of Welding:- The most critical welding we have in our model is the welding of two rods that falls down to cut the orange piece. Welding Properties n t(MPA) F(N) d(m) H(m) L(m) 3 0.057 28 0.01 0.004 0.1

The Analysis Of Movement Of The Rods In The Both Side Of the Model The following geometry and physic calculations were so necessary and important before design these mechanisms (X + 19.6)2 + (4.75)2 = X2 + (18.75)2 And found X= 7.65

Movements of the Orange Piece The place where the oranges inter Jonson Orange input The place where the oranges inter Jonson The movement while the press move down The movement whiles the press move upward

The movement of the special mechanism movement of the special ring inside the dome of the juice

The movement of the special mechanism Motor movement

analysis of the cost Total cost = 928 $ Total = 258 $ Total =140 $   Material cost motor 100 $ Stainless rods 45 $ Steel rods and beams and the material of the cover 105 $ springs 8 $ Gears and chain 25 $ Plastic parts 15 $ Gypsum 10 $ Total = 258 $ Operations cost Milling 20 $ Sand casting 50 $ Cutting and shaping Joints Total =140 $ Workers cost 200 $ Consumption of equipment 80 $ cost of finishing operations as the electrical operation and painting 100$ Time lost and Miscellaneous cost Total cost = 928 $

final drawings and views

Isometric view

Front view

Top View

Recommendations 1- Sensor should be connected to every moved parts to avoid any damaged will be happened. 2- Self clean design can be added too. 3- Design a mechanism to can put all the orange pieces in one time not one after one. 4- Refrigeration system can be added to the juice

Thanks for listening