Locking Screw Nylon Patch Coating Machine With Double-Track Spray
Project Background
A medium-sized metal fastener manufacturer from the United States specializing in automotive anti-loose screws faced severe production bottlenecks before adopting our double-track nylon coating machine. The client’s original single-track coating line only supported small screws below M6, with low hourly output of 6,000 pieces. The factory needed to expand production of M3–M10 half-circle coated iron screws for new automotive orders, demanding higher automation, wider processing range and consistent coating quality. After equipment comparison, the customer purchased our 2-meter double-track nylon coating machine as the core upgrade solution.
Design Concept
The machine adopts an integrated dual-track automatic processing design to resolve low efficiency, narrow compatibility and unstable coating quality.
- Adjustable dual-belt conveying structure: Two synchronous belts with variable track width clamp screws firmly. Operators switch between half-circle partial coating and full-circle full-thread coating by adjusting belt speed difference to satisfy diverse fastener standards.
- Custom ultra-high frequency induction heating: It rapidly heats screw threads to 185°C without damaging metal surfaces. 20kW and 30kW power options fit small and large screws respectively to guarantee firm nylon powder adhesion.
- Closed-loop powder recycling + multi-stage cooling system: A dual-outlet vibrator evenly delivers nylon powder, while a stainless steel recycling barrel recovers surplus powder to cut material waste. Sequential water cooling, double-layer air cooling and basket fan cooling solidify coatings quickly to prevent deformation.
- Modular component layout: Separated feeding, heating, cooling and collecting units simplify mold change and maintenance. Optional auto feeding and powder refilling devices further reduce manual workload.
Key Equipment Specifications
| Parameter Category | Detailed Specification |
| Processing Range | Standard model: M3–M10 headed metal screws, length 80–900mm; Extended 2m frame: M3–M25, length 80–1500mm |
| Production Capacity | 15,000 pieces/hour (for standard M10×30 half-circle coated screws) |
| Heating System | 380V ultra-high frequency heater, 20kW/30kW optional, constant heating temperature 185°C |
| Conveying & Feeding System | Dual 220V 370W DC synchronous drive motors; 220V 400W linear vibrator feeding unit; adjustable dual-track width |
| Powder Circulation System | 250mm-caliber dual-outlet feeding vibrator (220V 300W); stainless steel recycling barrel with 2.2kW 380V motor |
| Cooling System | Magnetic pump water cooling tank; 1.2m double-layer air cooling conveyor (2×120W motors); 3 centrifugal cooling fans under receiving basket |
| Installation Footprint | 3.5m (width) × 2.0m (height), compatible with medium-sized workshop layouts |
Video Show
