Multi-Angle Optical Acquisition and Specialized Lighting
Qualitest optical sorters, including the QSS-G07 Glass Plate Optical Sorting Machine and the QSS-C07 Conveyor Belt System, isolate non-conforming parts across a four-step workflow: vibratory bowl singulation, high-speed glass or belt transport, multi-camera image capture, and pneumatic air blast ejection.
- Feeding & Singulation: Vibratory bowls and centrifugal feeders aligning up to 1,200 parts per minute.
- Optical Inspection on Rotating Glass Plate / Belt: Up to 7 multi-angle cameras providing top, bottom-through-glass, and side profile coverage.
- PC-Based Automatic Optical Inspection System: Sub-pixel evaluation achieving ±20 micron accuracy across thread pitch, OD/ID concentricity, chamfer, burrs, and real-time SPC database tracking.
- High-Frequency Pneumatic Ejection: Targeted solenoid air blasts firing defective parts directly into reject channels.
The acquisition stage uses up to seven high-resolution industrial CCD cameras arranged at top, bottom, and side profile angles. On glass plate models like the QSS-G07, bottom cameras view components directly through optical hardened glass. Specialized illumination, including dome, coaxial, and low-angle LED light bars, eliminates glare, shadows, and reflections on polished turned parts, screws, nuts, studs, stampings, and washers.
| Sensor Setup | Viewing Angle | Inspection Focus | Performance Capability |
|---|
| Top CCD Camera | 90° Overhead | Head diameter, drive recess depth, surface cracks | Catches top-surface flaws and stamped markings |
| Bottom CCD Camera | Through Glass Plate | Base geometry, washer presence, bottom ID/OD | Inspects 100% of underside features without manual flipping |
| Side Profile CCDs | 0° to 45° Profile | Thread pitch, thread depth, height, chamfer angle | Verifies full length and profile dimensions down to ±20 µm |
| Multi-Angle LEDs | Coaxial / Dome / Low-Angle | Glare reduction on reflective metal | Removes highlights on turned brass, steel, and aluminum |
Sub-Pixel Edge Tracing and Algorithmic Defect Classification
Once cameras capture high-resolution frames, Qualitest's PC-Based Automatic Optical Inspection System processes image matrices to verify part dimensions against programmed tolerance limits using sub-pixel edge detection, Sobel operators, and contour analysis.
The system measures inner diameter (ID), outer diameter (OD), height/thickness, thread pitch, major/minor thread diameter, recess depth, across flats/corners, chamfer angles, roundness, and concentricity down to ±20 micron measurement accuracy at throughputs reaching 400 to 1,200 parts per minute.
Beyond dimensional checking, deep neural networks like YOLO and Mask R-CNN identify surface burrs, damaged threads, incomplete plating, chips, and material cracks. Real-time Statistical Process Control (SPC) modules log measurement variances into an integrated database to generate automated quality reports and track manufacturing trends.
High-Frequency Actuation, Dual-Plate Inspection, and Feeding Dynamics
When the inspection system flags a defective piece, solenoid-actuated air valves fire millisecond air blasts, blowing non-compliant components out of mid-air into reject bins as they pass ejection channels. For heavier turned parts or longer studs, mechanical sorting gates or pneumatic paddles divert failed items with high repeatability.
To ensure complete 360-degree coverage, the Qualitest QSS-G07 utilizes dual glass turning tables, transferring parts between plates to inspect both upper and lower surfaces without manual handling.
Integrated vibratory feeder bowls and centrifugal aligners arrange fasteners single-file, ensuring steady spacing before entry onto the glass plate or conveyor belt. Combining multi-angle optics, sub-pixel software math, and high-speed pneumatic ejection gives high-volume fastener, turned-part, and automotive stamping lines the exact precision required to guarantee zero-defect shipments and maintain strict ISO compliance.
