Foshan Dongliu Automation Technology Co., Ltd. Quality Control

Precision Engineered Quality: The Foundation of Our Manufacturing Excellence

At Dongliu, quality control transcends mere procedure—it is the core philosophy embedded in every stage of our design, engineering, and manufacturing processes. As specialists in advanced production systems for HVAC, energy storage air conditioners, and heat pumps, we recognize that the reliability of your end-products depends entirely on the precision, durability, and flawless operation of our manufacturing equipment. Our uncompromising quality standards ensure that every assembly line, test station, and auxiliary system we deliver operates at peak performance for its entire lifecycle.

1. Systemic Quality Integration from Concept to Commissioning

Our QC framework adheres to ISO 9001:2015 principles and integrates Industry 4.0 methodologies. Each project undergoes:

• Design Validation: FEA simulation, tolerance stack-up analysis, and DFM/A (Design for Manufacturing/Assembly) reviews.

• Supplier Qualification: Rigorous vetting of component suppliers (e.g., linear guides, PLCs, pneumatics) with PPAP (Production Part Approval Process) documentation.

• Risk Mitigation: PFMEA (Process Failure Mode Effects Analysis) for every workstation in the production line.

2. Material & Component Traceability

• All incoming materials (structural steel, aluminum profiles, bearings, motors) undergo:

  • Spectroscopic analysis for alloy verification

  • Dimensional checks via CMM (Coordinate Measuring Machines)

  • Certificates of Conformity (CoC) with full traceability to mill certificates

• Critical components (servo drives, sensors, controllers) are batch-tested against datasheet specifications.

3. In-Process Monitoring: Real-Time Data-Driven Control

Our production flow incorporates closed-loop QC checkpoints:

• Machining & Fabrication:

  • Laser-cut parts validated with 3D scanning (±0.1mm tolerance)

  • Weld seam integrity tested via ultrasonic NDT (Non-Destructive Testing)

• Sub-Assembly Verification:

  • Pneumatic circuits: Leak-down tests (<0.1 bar/min loss)

  • Electrical cabinets: Hi-pot testing (1500V AC) and ground continuity checks

4. End-of-Line Validation: Beyond Functional Testing

Every complete production line undergoes exhaustive system-level QC:

• Cycle Time Stress Testing: 72-hour continuous run at 110% design capacity

• Precision Metrics:

  • Torque accuracy validation on tightening stations (±3% of target)

  • Thermal performance testing for HVAC-specific lines (refrigerant charge ±2g tolerance)

• Safety & Compliance:

  • CE/PED/UL certification audits

  • Emergency stop response time <0.5 seconds

5. Continuous Improvement Ecosystem

• Big Data Analytics: SPC (Statistical Process Control) on critical parameters (vibration, temperature, pressure) to predict maintenance needs.

• Customer Feedback Integration: FRACAS (Failure Reporting Analysis and Corrective Action System) linked to engineering updates.

• Annual Recertification: All test jigs and metrology equipment recalibrated at ISO/IEC 17025-accredited labs.