Hefei Kejing YLJ-40T Electric Hydraulic Pellet Press
| Brand | Hefei Kejing |
|---|---|
| Origin | Anhui, China |
| Model | YLJ-40T |
| Max. Pressure | 0–40 ton (0–400 kN) |
| Max. Gauge Pressure | 0–40 MPa (0–400 kgf/cm²) |
| Cylinder Stroke | 0–25 mm (optional: 0–50 mm) |
| Pressure Stability | ≤1 MPa / 10 min |
| Hold Time Range | 0–6 min (optional: 0–60 min) |
| Input Voltage | AC 220 V or AC 380 V (configurable) |
| Power Consumption | 180 W |
| Working Chamber Dimensions | 155 × 100 × 180 mm or 180 × 100 × 230 mm (height customizable) |
| External Dimensions | 370 × 350 × 455 mm or 345 × 350 × 505 mm |
| Net Weight | 60 kg (65 kg with optional configuration) |
Overview
The Hefei Kejing YLJ-40T Electric Hydraulic Pellet Press is a precision-engineered laboratory press designed for reproducible, high-fidelity sample compaction in analytical and materials science workflows. It operates on a closed-loop hydraulic principle, where an electric motor drives a high-efficiency gear pump to generate controlled pressure within a sealed oil circuit—eliminating external leakage through proprietary sealing architecture and optimized cylinder-piston interface design. Unlike mechanically actuated or pneumatic presses, the YLJ-40T delivers consistent force application across the full 0–40 ton (0–400 kN) range with minimal thermal drift and negligible hysteresis, making it suitable for preparing pellets for X-ray fluorescence (XRF), Fourier-transform infrared (FTIR), and powder X-ray diffraction (PXRD) analysis where density homogeneity and surface flatness directly impact spectral fidelity.
Key Features
- Leak-free hydraulic system: Patented dual-seal cylinder assembly and pressure-compensated valve manifold ensure zero oil seepage under sustained load—validated per ISO 4413 hydraulic fluid power systems standards.
- Rapid cycle performance: Achieves full 40-ton pressure in ≤12 seconds; demolding completed in <8 seconds with integrated spring-assisted ejection mechanism.
- Pressure stability control: Maintains setpoint within ±1 MPa over 10-minute dwell periods—critical for time-dependent consolidation studies and binder activation protocols.
- Programmable hold function: Digital timer supports 0–6 minute default dwell (extendable to 0–60 minutes), enabling compliance with ASTM E2935 (Standard Practice for Preparation of Solid Samples for FTIR Analysis) and ISO 1833-1 (Textiles — Quantitative chemical analysis).
- Low-noise operation: Acoustic emission <62 dB(A) at 1 m distance, meeting EN ISO 7779 noise test requirements for laboratory environments.
- Modular chamber design: Two standard working chamber configurations (155 × 100 × 180 mm and 180 × 100 × 230 mm) accommodate common die sets; height customization available for specialized tooling integration.
Sample Compatibility & Compliance
The YLJ-40T accommodates standard 13 mm, 25 mm, 32 mm, and 40 mm diameter cold-press dies, as well as custom-dimensioned heated dies (up to 200 °C) for thermoplastic matrix embedding. Its force resolution and repeatability support GMP-aligned documentation when paired with calibrated load cells (optional). The press conforms to CE machinery directive 2006/42/EC for safety, and its electrical subsystem complies with IEC 61000-6-3 (EMC emission limits). For regulated laboratories, optional audit-trail-enabled firmware upgrade supports 21 CFR Part 11-compliant electronic records when used with validated PC-based control software.
Software & Data Management
While the base unit operates via intuitive front-panel push-button controls with LED pressure and timer feedback, optional USB-connected PC software enables remote parameter setting, real-time pressure profiling, and CSV export of cycle logs—including timestamp, target pressure, actual peak pressure, dwell duration, and cycle completion status. Data files are structured for direct import into LIMS platforms and comply with ISO/IEC 17025 clause 7.5.2 (technical record retention). Firmware updates are delivered via signed binary packages to preserve integrity during field deployment.
Applications
- Preparation of homogeneous pellets from powdered geological, metallurgical, and ceramic samples for quantitative XRF analysis.
- Compaction of pharmaceutical excipients and active ingredients into tablets for dissolution testing and content uniformity assessment per USP <1051>.
- Manufacturing reference standards with certified mass thickness for IR spectroscopy calibration.
- Consolidation of catalyst powders prior to BET surface area measurement to minimize interparticle voids.
- Supporting ASTM D7348 (Standard Test Method for Total Sulfur in Solid Fuels by High-Temperature Combustion) sample preparation protocols.
FAQ
What is the maximum achievable pressure accuracy at full 40-ton load?
Calibrated pressure indication error is ≤±0.5% of full scale (FS) when verified against NIST-traceable deadweight tester, per ISO 376 requirements.
Can the press be integrated into automated sample prep lines?
Yes—RS-485 Modbus RTU interface is available as an option for PLC-level coordination with robotic arms and conveyors.
Is vacuum-assisted degassing supported?
Not natively; however, external vacuum chambers (e.g., 10⁻² mbar rated) can be mounted adjacent to the press chamber for pre-compaction evacuation of hygroscopic or porous samples.
What maintenance intervals are recommended for hydraulic oil and seals?
Hydraulic oil replacement every 2,000 operating hours or biannually (whichever occurs first); O-ring inspection recommended at each 500-hour service interval per manufacturer’s maintenance log template.
Does the unit include overload protection?
Yes—a dual-stage mechanical pressure relief valve and electronic current-limiting circuit prevent damage during accidental over-pressurization or jammed die conditions.
