Pot-lid surface analysis and knob-hole quality test
A robot-mounted camera scans the dome of the glass lid tile by tile under low-angle lighting; in each tile two opposing bar lights strobe in turn and scratches light up in the dark field. The knob hole is then backlit from below and its diameter, edge chips and centring are measured.
Scratch length, hole diameter and centring are recorded for every lid; a non-conforming lid is flagged on the stack light and the display, its nest number is reported to the PLC through the control cabinet and the lid is marked for removal.
- 01 Positioning
- 02 Surface
- 03 Hole
- 04 Decide
The robot moves the camera above the lid in its nest.
- Scratch length
- —
- Hole diameter
- —
- Centring offset
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
The domed, tempered glass is both transparent and reflective: fine scratches are invisible under direct light while ceiling reflections read like defects. The hole edge refracts through the glass thickness and shows a double edge under top lighting.
Solution approach
The camera sits on the robot wrist and approaches the dome tile by tile; in each tile two opposing low-angle bar lights strobe in turn, so a scratch lights up in the dark field whatever its direction. The knob hole is backlit from below; a circle is fitted to the silhouette edge to measure diameter and centring.
Process steps
- 01
Positioning
The robot moves the camera above the lid in its nest.
- 02
Surface
In each tile the two opposing bar lights strobe in turn; the dome is scanned in two tiles and the scratch shows up bright in the dark field.
- 03
Hole
The hole is backlit from below; its edge contour is extracted and a circle is fitted.
- 04
Decide
Scratch length, hole diameter and centring are compared with their limits.
Related applications
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