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

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

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

5. 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.

6. 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.

7. 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.

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

9. The Parts Of Project
gear1, gear2 and chain
A Motor

10. Beams
Beam # Beam #1
Beam #3

11. A knife (fixed on the plate)

12. The Press (dimension and drawing)

13. Rod and Special mechanism

14. Dome of the juice

15. Cover of the machine Orange path

16. 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

17. 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
Steel
7.8
690
760

18. 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

19. 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

20. 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=

21. 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

22. 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

23. 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)

24. 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

25. 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

26. 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 )2 + (4.75)2 = X2 + (18.75)2
And found X= 7.65

28. 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

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

30. The movement of the special mechanism
Motor movement

31. 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 $

32. final drawings and views

35. Isometric view

36. Front view

37. Top View

38. 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

39. Thanks for listening