Jiubin JB-40C Reversing and Forward Bending Tester for Reinforcing Steel Bars
| Brand | Jiubin |
|---|---|
| Model | JB-40C |
| Origin | Shanghai, China |
| Rated Load | 200 kN |
| Bend Head Diameter Range | Φ6–Φ40 mm |
| Forward Bend Angle | 180° |
| Reverse Bend Sequence | 90° forward + 20° reverse |
| Span Adjustment | ≥340 mm |
| Piston Stroke | 410 mm |
| Hydraulic Pressure | 31.5 MPa |
| Test Speed | 0–100 mm/min (adjustable) |
| Power Supply | 380 V, 50 Hz |
| Net Weight | 550 kg |
| Dimensions (L×W×H) | 1460 × 750 × 2400 mm |
Overview
The Jiubin JB-40C Reversing and Forward Bending Tester is a vertically oriented, hydraulically actuated mechanical testing system engineered for standardized evaluation of bending ductility in reinforcing steel bars and flat metallic specimens. It operates on the principle of controlled quasi-static three-point bending, where a centrally applied load—via a precision-machined bend head—deforms a specimen supported on two adjustable span rollers. This configuration enables both forward (unidirectional) bending to 180° and sequential reverse bending (90° forward followed by 20° reverse), as required by GB/T 232–2010 and GB/T 1499.2–2018 for quality verification of hot-rolled ribbed steel bars used in reinforced concrete structures. The machine’s rigid C-frame architecture, integrated hydraulic power unit, and real-time displacement feedback ensure high reproducibility across repeated test cycles under ambient laboratory or industrial QA/QC conditions.
Key Features
- Adjustable span support system mounted in T-slots on the bending worktable, enabling continuous span adjustment from 340 mm upward to accommodate varying specimen lengths and standard compliance requirements.
- Robust mechanical locking mechanism using through-bolts across dual bending supports to prevent lateral displacement under high-load bending conditions (up to 200 kN).
- Modular bend head assembly: interchangeable cylindrical bend heads (Φ6–Φ40 mm) secured via clamping plates into a grooved holder—ensuring rapid tooling change and precise axial alignment.
- High-accuracy optical or potentiometric displacement sensor coupled with an embedded LCD interface, providing real-time digital readouts of bend angle (±0.5° resolution) and piston stroke (±0.1 mm resolution).
- Stepless speed control (0–100 mm/min) via variable-frequency drive (VFD) on the hydraulic motor, allowing fine-tuned loading rates per ASTM E8/E8M and ISO 7438 recommendations.
- Integrated safety architecture including front/rear metal mesh guarding, mechanical end-stop limiters, and hydraulic pressure relief valves compliant with ISO 12100:2010 functional safety principles.
Sample Compatibility & Compliance
The JB-40C accommodates rectangular, square, circular, and polygonal cross-section specimens—including deformed reinforcing bars (HRB335, HRB400, HRB500), cold-rolled strips, and structural steel plates up to 40 mm in nominal diameter. Its mechanical design satisfies mandatory test geometry stipulations in GB/T 232–2010 (equivalent to ISO 7438:2022), GB/T 1499.2–2018 (aligned with EN 10080 and ISO 6935-2), and GB/T 15825.5–2008. All bending fixtures are traceably calibrated against national metrological standards; documentation includes factory calibration certificates conforming to JJF 1064–2010 (Chinese metrology regulation). The system supports audit-ready operation in GLP/GMP environments when paired with optional electronic logbook modules.
Software & Data Management
While the base JB-40C operates via standalone LCD control, it features RS-232/RS-485 serial output for integration with third-party data acquisition systems. Optional PC-based software (sold separately) provides test sequence programming, real-time curve plotting (load vs. displacement), automatic pass/fail evaluation per user-defined angle thresholds, and export to CSV/PDF formats. Audit trails—including operator ID, timestamp, test parameters, and raw sensor values—are stored locally and comply with basic FDA 21 CFR Part 11 requirements when deployed with role-based access controls and electronic signature functionality.
Applications
This tester serves critical quality assurance functions across multiple sectors: incoming material inspection of reinforcing bars at precast concrete plants; routine certification testing in provincial construction materials quality supervision stations; R&D validation of new steel grades at metallurgical research institutes; and teaching laboratories in civil engineering departments verifying ductility-performance correlations. Its capacity to replicate field-relevant reverse-bend fatigue precursors makes it especially valuable for assessing cold-bend resilience of seismic-grade reinforcement under cyclic loading simulation protocols.
FAQ
What standards does the JB-40C explicitly support?
GB/T 232–2010, GB/T 1499.2–2018, and GB/T 15825.5–2008 — with full mechanical compliance for span, bend head geometry, and load application per clause requirements.
Can the machine perform automated cyclic bending tests?
No — it is designed for single-cycle forward and reverse bending per GB/T 232. Cyclic testing requires external programmable controllers and is outside its certified scope.
Is hydraulic oil included with shipment?
Yes — a full charge of ISO VG 46 anti-wear hydraulic oil is pre-filled and verified prior to dispatch.
What maintenance intervals are recommended?
Hydraulic filter replacement every 500 operating hours; annual recalibration of load cell and displacement sensor by authorized service center; biannual inspection of seal integrity in cylinder and valve manifold.
Does the system meet CE or UKCA marking requirements?
It complies with essential health and safety requirements of the Machinery Directive 2006/42/EC when installed with specified guarding and interlocks — however, formal CE/UKCA certification is purchaser-responsibility per local regulatory interpretation.
