Faculty of Engineering Mechatronics Department

Design Of Mechatronics ProjectSupervisor : Dr. Khalid AL-Wedyan

2007 -2008

Team WorkTeam Work

What is the heating and mixing tank

The mixing and heating system is a simple system which consists of 3-tanks, two of these tanks contain different fluids to be mixed and the third big tank which is called the mixing tank (the processing tank) contains two level sensors to determine the lower and upper level, it also contains the heater and the mixer.

The Basic SystemThe heating and Mixing

tank is formed form three basic system :

1- Fluid System

2- Thermal System

3 – Electrical system

Fluid system The fluid system contains

two basic elements :1- Tanks : a – tow storing tanks . b – one processing tank. c- products tank .

2 – Solenoid valve :We have three solenoid

valves Two in storing tanks and

one in the processing tank.

Tanks We have in our project four tanks which

we use it for many purposes which are :  To store the unprocessed liquids (two

tanks ) , where we want to put the tow liquid that we want to processed it.

 

The process room , where the two liquids will mixing and heating and this tank is the biggest tank and we connect to this tank the heater , DC motor for mixing , and two level sensors .

 

The product tank used to store the final product form the process

Solenoids valve What means of the solenoids valve ?The solenoids valve is a kind of valve but

its activated by electrical signal

How we connect the solenoid valve ?We connect it normally closed and when

the signal games to it he will change its state to be open so the liquid will flow through it until the signal its stop .

Thermal system In our project the

heater is the thermal system and the heat will flow from the heater to the mixture liquid .

The maximum

temperature that the heater achieve is 35 C

The heater works when a high signal actuates the relay this will close the circuit of the heater and allow the current to flow .

Electrical system

PIC16f877A

A microcontroller is an amazingly useful device. Akin to a very specialized CPU, a microcontroller is small, consumes little power, and can be programmed to quickly and reliably perform a wide variety of tasks.

PIC 16F877A

PIC16f877Awe chose the PIC16F877A because of the following

reasons:

It comes in a 40 pin DIP pin out and it has many internal peripherals.

The 40 pins make it easier to use the peripherals as the functions are spread out over the pins.  This makes it easier to decide what external devices to attach without worrying too much if there enough pins to do the job.

Each pin is only shared between two or three functions so it's easier to decide what the pin function (other devices have up to 5 functions for a pin).

RegulatorA linear voltage regulated power supply requires an

unregulated voltage that’s higher than the desired regulated voltage. For example, a 12 V power supply can supply power to a linear voltage regulator that outputs 5 V.

Linear voltage regulators are popular for the following uses:

Quick, small, simple circuits.Low cost, high volume products, such as inexpensive

consumer electronics.Circuits that consumes small amounts (100 mA or

less) of current.Regulated voltage that just slightly less than the

unregulated voltage.

Relay When the signal receive from the pic the relay will

change from it state this mean change from normally open to normally closed and the normally closed to normally open .

And in our project we connect it as normally open with the directional valve so when the signal came from the pic the relay became to normally closed so the signal reached the directional solenoid valve so the valve change it state to be open

The Mixer We use a DC motor as

mixer

the speed of the DC motor is decrease as the torque increase and so when we but in the liquid its speed will decrease.

Its take when it loaded maximum voltage 24V and maximum current 5A

Sensors We use in our project a

tow level sensor to indicate the level of the liquid .

We put the tow sensor in the processing tank one it the bottom of the tank and the other one in the upper of the tank .

The sensor in the bottom of the tank tell us if the tank is fully empty or not .

Sensors

The upper sensor tell us if the liquid arrive the higher point the we want the liquid to arrive .

If the liquid arrive the upper sensor the flowing the liquid from the tow storing tanks will be stop

The project circuit

Parts list 4 tanks 3 solenoid Heater DC motor Regulator Relay PIC 16F877A2 level sensor Bread boardTransistorPower supply

Question ????????

THE END