ATCB- Afri-tea & Coffee blenders (1963) limited, is the company situated at Bandari load, opposite gate number 4 of the main port at Dar es salaam.
This company deals with packing of the tea and coffee for the consumable purposes.
The project is going to be beneficial for the company and whole society who faces the alike problem.
This project is basically based on designing the system which will help in sorting of the improper weighed tins, rather than sorting them manually as it is performed recently.
PROBLEM STATEMENT
Problem which is to be delt with this project is the time wastage on sorting the tins, and having number of labours to perform this function.
So due to this problem, The designing of isolation system will help to sort all improper weighed tins hence having minimum time wasted.
SIGNIFICANCE OF THE PROJECT
Under the success of this project, less time will be consumed in isolating the tins.
Less man power will be employed, hence less financial resources utilized.
METHODOLOGY
Literature review
Data collection
Data analysis
Designing of circuit
Build the prototype
Testing the prototype
Report writing
LITERATURE REVIEW
This section includes existing system and proposed system.
The Existing System
Proposed system
Other components reviewed;
Single acting cylinders
PNEUMATIC SOLENOID VALVES
DATA COLLECTION
The data collected in my project were obtained as follows
Data analysis and design
The following is the proposed circuit for the designed system.
A/.Power supply
The control unit requires a 5V at 40 mA in the operation in this project.
The power consumption is thus:
Power = I x V
5V x 40 mA= 200 mW
B/. Servo motor
The servo operates at averaged 4.8 to 5v
C/. The load cell amplifier
The amplifier selected operates at 5V to maximum of 15V.
LOAD CELL TRANSDUCER
The load cell used in this project as proposed is supposed to have the capability of detecting the maximum of 1 kg.
The output electrical signal for a load cell is relatively low to be detected to a control unit which requires an input voltage of 5V and above.
Output signal for a load cell is 10 mV for 6 kg.
Now for the maximum weight to be measured in this project which is 1 Kg, thus
Since;
10 mV responds for 6 kg,
For 1kg = 10 mV/6kg= 1.67mV
For unit detection control the signal has to be amplified to 5V.
Thus,
The amplification factor= input to control unit/ output of a load cell
=5V/1.67mV=2994
The need for an amplifier to amplifier the signal to that extent
Gain = (Rf /R2) +1
Setting Rf=1MΩ
Gain=2994
R2=Rf/Gain= 1MΩ/2993
R2=334Ω (330Ω standard value)
Conclusion.
The design has been successfully completed, and the demonstrative prototype has been successfully archived by employing ultrasonic sensor which detects distance instead of weight .
Recommendation
The obtaining of materials have been a great challenge especially in implementing the prototype. However the designing idea was based on pneumatics but after carrying out some studies, the design has been shifted from Pneumatics to Savor motor implementation.
Hence it is recommended that for the development of this projected idea one has to be aware on cost as well as trying to search for materials from abroad markets instead of basing only on local markets.