Category : Machine vision related products, inspection applications with industrial vision or scanning systems > Vision systems for inspection

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DESCRIPTION:
During the manufacture of flat glass using a float glass style installation, the molten glass is drawn from the oven by the top rolls which leave marks on the glass at the edge of the ribbon. Once the ribbon has cooled down it is cut into large sheets called plates and the marked edges are removed. These plates are then stored vertically on racks or sent directly for cutting.
Problems in the process can result in badly cut plates, incorrectly squared or not conform in size. The detection of such faults in the sheets is important as these can effect their subsequent transformation. The idea site for the VCE 3400 is just after the ribbon is cut into large plates.
Characteristics of the products to be controlled :
- Flat glass
- Glass tint and transmission : irrelevant
- Glass width : 3.4 m
- Glass length 6.2 m
- Thickness : 1 to 12 mm
- Minimum size of cutting fault : 5 x 5 mm
- Maximum conveyor speed 80 m/mn
Location:
The detection principle being based on the light reflection of the glass, the system is located above the glass at a point where the conveyance of the plates is stable. Other constraints regarding the location are connected to the height of the camera and the access required to it for adjustment and maintenance purposes.
The camera support and the lighting, rugged and independent of the conveyor structure ensure the systems protection from parasitic vibrations.
Acquisition and processing chain:
- LORD Ingénierie CCD line scan camera CNL5150V
- LORD Ingénierie acquisition board ASL 8220
- LORD Ingénierie real-time processing board ATL8220
- Pentium industrial PC
- Standard software with parameters according to customer’s requirements
Lighting :
- Light box using standard fluorescent tubes
- Specific power supply for fluorescent tubes
Support :
- Gantry sized adapted to conveyor dimensions
- LORD Ingénierie protective casing
- LORD Ingénierie camera angle adjustment system
Detection principle concerning (cutting)
To detect cutting faults with two line scan cameras, the system uses the advancing movement of the glass on the conveyor to collect all the data corresponding to the left and right edges of the plates. All of this information is then processed once the plate has completely passed through. This establishes good control of the conveyoring of the plate with regards to the regularity of conveyor speed as much as the exactitude of the data translation and ensures the systems performance.
The verification of the squaring of the plate is made by comparison of the values of two diagonals, obtained by detection of the plate’s four corners. The result of this verification is therefore hardly subject to any variations caused by the conveyor speed as it is based on two measures taken under the same conditions.
Advantages and Performance:
- " Accept/Reject " response less than 300 ms after the glass has passed under the cameras
- The VCE 3400 system can be used on all existing installations

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