Tyre Back Identification by PC Based Machine Vision System

	Diagram Of Faulty Tyre Back Separation System by PC Based Machine Vision
	1- Control Cabin 2- System Computee 3- Fieldpoint RTU moduls 4- Power Source 5- Operating Network 6- RS-232 Communication 7- ( Besleme Hattı ) 8- Image Signal Line	9- Control Line 10- Camera 11- Light Source 12- Production Line 13- Tyre Back 14- Separation Unit 15- Loading line 16- Junk back line

Customer:

Brisa Bridgestone Sabancı Tyre Factory / Izmit

Goal :

To analyse the marks on the "back" of the motorized vehicles which were drawn by the preceding process and controls , to determine the faulty tyres and to take the faulty tyres out from the process line

Design and Technology:

The tyres backs without any printing or marks except the color coding of the tyre was being produced in the shape of ribbons with the lenght of kilometers. And the quality control was made by a countinious weighing test. As a result of the weighing test the faulty areas are marked and the tyre ribbon was being cut to produce the tyre backs. But the marked side of the tyrebacks was the bottom side of the ribbon on the conveyor. So it was a big problem to see and take out the faulty tyre backs from the fast process line.

As a result of the system analyses considering customer's request for the minimum interference to the process line. It was decided to change the fault mark with a mark which is suitable for machine vision and to put a camera a suitable illumination under the conveyor to look the tyre from below and to sens the fault mark real-time.

Another reason for selecting the machine vision technology is the adaptation to the varius sizes of tyre backs needs no other interference.

The tyre images taken by the industrial illumination, industrial camera and optical components and transmitted to the computer by frame grabber cards, are used for all controls in our system.

For our system, which needs a high speed and a high resolution, an industrial and analog Sony camera and a Cosmicar Pentex lens was used.

The frame grabber, input/output cards and LabVIEW software development platform are the products of National Instruments Company.

With the real-time image processing algorithm designed not to use high system resources, a normal standart PC was enough to be used as the system computer.

All of the components of the project are rugged in appropriate industrial enclosures.

Solution :

Solution : In the production line which has a speed of approximately 1m/s, the images , which were taken by a camera looking to the tyre back , which was illuminated properly.
These images are anylised to determine whether there is a tyre or not, if there is a tyre it searches for the fault mark on the tyre back.

With the configuration given above, our system can handle 20 contols per sec, This number can be increased by hardware upgrades.

Incase of a fault mark on the tyre , with the signals which are sent to the control PLC of the line the faulty tyre back is being made to pass by the loading are and is transported to the junk area.

In this level the seperated tyre bach is recyclable but a in case of finding a fault in a finished tyre, the tyre is not recyclable. From this reason the system has a big aid to the enviroment. The system-operator relationship is provided by an easy use operator interface. The condition of the inspected tyre an the work stats can be watched easily on the screen and all inspection information is stored in dbase format for the analysis and reporting.

User organisation, relay and reporting editing, tyre and fault parameters are all gathered in the options section.

The users can easily acces the simple but efficient help file whenever they need.

Result :

Our system which were developed by our engineers using hardware and software the products of woldwide known companies is working successfully since 1998.

Our system which made it possible to separate and recycle the tyre backs, does a great aid to the enviroment and economy.

Application Areas :

All vehicle tyre production facities

Referance : " I thank you for your efforts and for your positive contribution to BRISA as a result of your efforts. I wish continious success for your work" .

Engineering Manager