Tuofeng TFW-3 Dual-Column Microcomputer-Controlled Electronic Universal Testing Machine
| Brand | Tuofeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TFW-3 |
| Instrument Type | Electromechanical Universal Testing Machine |
| Load Capacity | 3 kN (Configurable up to 200 kN) |
| Accuracy Class | ISO 7500-1 / ASTM E4 Grade 0.5 |
| Compliant Standards | GB/T 16491–2008, JJG 475–2008, ASTM E4, ISO 7500-1, DIN 51221, JIS B 7721 |
Overview
The Tuofeng TFW-3 is a dual-column, microprocessor-controlled electromechanical universal testing machine engineered for high-precision static mechanical property evaluation of metallic chains, wires, fasteners, and structural components. It operates on the principle of controlled axial force application via servo-motor-driven precision ball screws, enabling accurate measurement of tensile strength, yield point, elongation at break, modulus of elasticity, and proof load—critical parameters for chain certification per ISO 19901-5, ASTM A90, and EN 818 series standards. Designed for laboratory and production QA/QC environments, the system delivers traceable, repeatable results under both open-loop and closed-loop control modes, with real-time synchronization of load, displacement, and strain data acquisition.
Key Features
- Dual-column rigid frame architecture with high-stiffness crosshead guidance, minimizing lateral deflection during high-force chain pull tests (up to 200 kN in extended configurations)
- Precision ground ball screw transmission system coupled with imported servo motor and planetary gear reducer, ensuring smooth, backlash-free motion across the full speed range (0.001–500 mm/min)
- Load cell resolution of 1 part in 500,000 full scale, with verified linearity error ≤ ±0.005% of reading and class 0.5 accuracy per ISO 7500-1
- Integrated safety triad: electronic travel limit switches, emergency stop circuitry, and automatic overload cutoff (>110% of rated capacity)
- Motorized crosshead with dual-speed positioning (fast jog + fine adjustment), programmable return-to-start function, and manual override capability
- Modular extensometry support—including clip-on electronic extensometers (ASTM E83 Class B-1) and video-based digital image correlation (DIC) interfaces for non-contact strain mapping
Sample Compatibility & Compliance
The TFW-3 accommodates standard and custom chain specimens—including welded, stamped, and forged metal chains (e.g., grade 80, grade 100 lifting chains)—via interchangeable wedge-action, pneumatic, or hydraulic grips. Specimen clamping force is independently adjustable to prevent slippage or premature necking. The system complies with international test method standards including ISO 19901-5 (offshore lifting equipment), ASTM A90 (proof and breaking load testing of steel chains), EN 818-2/4/6 (transport and lifting chains), and GB/T 20934–2022 (safety requirements for chain hoists). All hardware and firmware meet electromagnetic compatibility (EMC) requirements per IEC 61326-1 and are suitable for GLP-compliant laboratories conducting accredited material verification per ISO/IEC 17025.
Software & Data Management
Tuofeng TestSuite™ v5.2 is a Windows-based, multi-language (English, Simplified/Traditional Chinese) testing platform supporting ASTM E4, ISO 6892-1, and GB/T 228.1 compliant test sequences. The software enables closed-loop control modes—constant rate of extension (CRE), constant load ramping, load holding, and displacement targeting—with configurable dwell times and step profiles. Real-time plotting includes synchronized stress–strain, load–displacement, and load–time curves; post-test analysis calculates Rp0.2, Rm, A50mm, E-modulus, and reduction of area. Data export supports CSV, XML, and PDF report generation with embedded metadata (operator ID, calibration certificate ID, environmental conditions). Audit trail functionality satisfies FDA 21 CFR Part 11 requirements when configured with user authentication and electronic signature modules.
Applications
- Tensile proof and break testing of industrial lifting chains (grade 30, 43, 70, 80, 100) per ISO 19901-5 Annex C
- Dynamic fatigue pre-screening via repeated low-cycle loading protocols (requires optional cyclic controller add-on)
- Weld integrity validation for electric-resistance welded chain links
- Quality conformance testing for automotive seat belt retractors and cable assemblies
- Research-grade characterization of high-strength alloy chains (e.g., stainless steel 316L, Inconel 718) under elevated temperature (with environmental chamber integration)
- Third-party certification testing for CE marking, ASME B30.9, and OSHA-compliant chain inspection programs
FAQ
What is the maximum chain length the TFW-3 can accommodate for tensile testing?
Standard configuration supports up to 800 mm effective stroke; extended columns (optional) increase usable length to 1,500 mm for long-link or multi-loop chain assemblies.
Does the system support automated batch testing for production line QC?
Yes—TestSuite™ includes script-based sequence programming, barcode-triggered test initiation, and pass/fail logic gates with configurable tolerance bands per parameter.
Can the TFW-3 be integrated into an existing MES or LIMS infrastructure?
It supports OPC UA and Modbus TCP protocols for bidirectional data exchange; raw test data and summary reports are exportable via RESTful API.
Is calibration traceability provided with the instrument?
Each unit ships with NIST-traceable calibration certificates for load, displacement, and strain channels, valid for 12 months under normal use conditions.
What maintenance intervals are recommended for sustained accuracy?
Ball screw lubrication every 500 operational hours; annual verification of load cell linearity and crosshead alignment per ISO 7500-1 Annex B procedures.
