Project Background & Industrial Control Requirements
Medical protective clothing manufacturing dictates strict seam-sealing constraints to safeguard personnel against biological and liquid infiltration. The critical process relies on a heavy-duty glue pressing machine (seaming machine) that applies heat-sealing adhesive tape across vulnerable fabric seams. To achieve pristine sealing continuity without scorching the delicate protective material or introducing structural wrinkles, the control automation must execute highly synchronized multi-axis motion, manage responsive pneumatic pressure tracking, and deliver sub-degree thermal stability over intense, continuous production shifts.
System Hardware
| Hardware | Model | Specific Role within the Architecture |
| Logic Control Layer | Samkoon FAT-16MT PLC | Primary logic unit running fast cycle times to coordinate pulse trains, analog telemetry, and safety loops. |
| I/O Expansion Layer | Samkoon S-E8X8R + S-E4TC | Expands discrete relays and integrates a high-precision thermocouple tracking interface for real-time thermal loops. |
| Operator Interface Layer | Samkoon SK-043QT HMI | 4.3-inch space-saving terminal powered by an industrial Cortex-A7 core. Manages speed ratio calculation, temperature targets tuning, and error warning registers. |
| Motion Execution Layer | Dedicated Stepper Systems | Three independent stepper pulse outputs synchronized to run continuous tape feeding and rollers profiling. |
Core Control Logic & Process Strategy
- ±0.1°C High-Precision PID Thermal Loop: The system integrates a dedicated closed-loop PID control algorithm to direct the hot air gun heater. Real-time analog feedback ensures ultra-fast preheating, stabilizing target operational temperatures (e.g., 350°C) with a rigid precision profile of ±0.1°C to safeguard fabric integrity.
- Synchronous 3-Axis Stepper Coordination: The FAT controller simultaneously drives three separate pulse channels. This architecture maintains precise synchronization between the material upper roller, lower roller, and the active tape feeding mechanism, preventing stretching or physical misalignment of the sealing tape.
- Dynamic Speed Ratio Tracking: Operators can tune the differential speed percentage (e.g., 100% baseline matching) directly via the HMI runtime screen. This permits instant on-the-fly mechanical tolerance compensations based on variable material thicknesses.
- Dual Foot-Switch Interlocking Sequence: The automation topology maps physical inputs to sequential labor habits: Left foot switch engagement lowers the pneumatic pressing wheel → Right foot switch command triggers the dynamic motion cycle, ensuring secure field operation control boundaries.
Functional Telemetry & Software Boundaries
- Manual Tape-Cutting Automation: Dedicated on-screen logic triggers a localized solenoid knife to clear the tape head and automatically feed preset tail lengths, saving raw material stock during batch changeovers.
- Over-Temperature Protection & Fault Blocks: Built-in diagnostic monitors actively track hot air gun thresholds. The system instantly cuts heating element power and triggers audible alarms if thermal variables breach unsafe boundaries.
- Dual-Language Micro-Kernel Environment: Operating on a dedicated non-OS software platform, the application architecture boots instantly and provides field operators with seamless English/Chinese language toggles, runtime diagnostics, and manual hardware JOG tracking inputs.
Field Telemetry & Screen Interface Compilation
Actual firmware interfaces and field application layout. The screen capture displays real-time hot air telemetry (350°C actual vs 350°C target), active roller velocity metrics (35.0 m/min), and dedicated sub-menus for automated cutting settings, safety parameters calibration, and I/O status diagnostic registers.
