MingShen Science MK-8 Miquel Drum Tester
| Brand | MingShen Science |
|---|---|
| Origin | Henan, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | MK-8 |
| Drum Internal Diameter × Length | 1000 mm × 1000 mm ±5 mm |
| Rotational Speed | 25 rpm (100 revolutions in 4 min ±10 s) |
| Motor Power | 2.2 kW |
| Net Weight | 970 kg |
| Overall Dimensions (L×W×H) | 1830 mm × 1350 mm × 1800 mm |
| Voltage | 380 V / 220 V AC |
Overview
The MingShen Science MK-8 Miquel Drum Tester is a precision-engineered mechanical strength evaluation instrument designed and manufactured in strict compliance with GB/T 2006–2002, “Determination of Mechanical Strength of Metallurgical Coke.” It implements the standardized Miquel drum method—a gravimetric impact and abrasion test—to quantify two critical performance indicators of coke used in blast furnace operations: shatter strength (resistance to fragmentation under impact) and abrasion resistance (resistance to surface wear during handling and transport). The apparatus subjects a representative 50 kg coke sample to controlled rotational tumbling inside a rigid cylindrical drum rotating at 25 rpm for exactly 100 revolutions (4 minutes ±10 seconds), simulating mechanical stresses encountered in industrial conveyance systems. Post-tumbling, the sample is sieved through standardized round-hole screens (60 mm, 40 mm, 25 mm, and 10 mm apertures) to determine mass distribution across size fractions. The resulting M40 (mass % retained on 40 mm sieve) and M10 (mass % passing 10 mm sieve) indices are calculated per GB/T 2006 and serve as internationally recognized proxies for coke’s structural integrity and thermal stability in high-temperature reduction environments.
Key Features
- Robust drum construction: 1000 mm internal diameter × 1000 mm length drum fabricated from 8.0 mm thick wear-resistant steel plate; interior reinforced with four longitudinal 100 mm × 50 mm × 10 mm angle steel ribs spaced at 90° intervals to ensure uniform impact energy distribution.
- Precision motion control: Integrated 2.2 kW three-phase motor coupled with a gear-reduction transmission system delivers stable 25 rpm rotation; timing accuracy maintained within ±10 s over 4-minute cycles via programmable electronic timer with LED status indicators (red = standby, green = active).
- Secure drum sealing: 500 mm × 600 mm hinged access door with gasketed flange ensures dust-tight closure during operation and facilitates rapid sample loading/unloading.
- Operator safety & repeatability: Emergency stop button mounted on front panel; automatic shutdown after preset revolution count; 1–2 minute post-rotation settling period mandated before opening to allow fines sedimentation—minimizing airborne particulate interference during post-test handling.
- Modular compatibility: Designed to integrate seamlessly with optional auxiliary equipment—including JXS-5 drum-pre mechanical sizing sieve (4-layer, 11.5° inclination, 0.75 kW) and JXS-2 drum-post mechanical sieve (dual-deck, 45 s timed cycle, 1.5 kW)—to eliminate manual sieving variability and improve throughput consistency.
Sample Compatibility & Compliance
The MK-8 accepts coke samples prepared per GB 1997 (sampling procedures) and GB/T 2005 (size classification and mass proportioning). Each test requires two independent 50.0 kg ±0.1 kg specimens, sized to exclude particles <25 mm prior to loading. The system supports routine verification per GB/T 2006: drum timing calibrated monthly; screen aperture dimensions (60 mm ±0.5 mm, 25 mm ±0.5 mm, 10 mm ±0.4 mm) verified monthly using certified gauge blocks; drum rotational speed confirmed with tachometer. While GB/T 2006 is the primary reference, the test methodology aligns conceptually with ISO 5012:2014 (Coke — Determination of drum strength) and ASTM D3417 (Standard Test Method for Gross Calorific Value of Coal and Coke), supporting cross-laboratory data comparability in global metallurgical QA/QC workflows. All mechanical components comply with IEC 60204-1 (Safety of machinery – Electrical equipment).
Software & Data Management
The MK-8 operates as a hardware-controlled analog system without embedded firmware or digital interface. Timing and motor actuation are managed via discrete relay logic and electromechanical timers—ensuring long-term operational stability, immunity to software corruption, and full traceability under GLP/GMP audit conditions. All test parameters (start time, stop time, total revolutions, ambient temperature/humidity if logged manually) are recorded in a bound laboratory notebook or LIMS-compatible spreadsheet template. For laboratories requiring electronic records compliant with FDA 21 CFR Part 11, integration with external data acquisition modules (e.g., USB-connected programmable logic controllers with timestamped event logging) is supported via the rear-mounted terminal block (motor load and mains input terminals clearly labeled). Calibration certificates for timing devices and screen gauges must be retained for minimum five years per standard QA documentation requirements.
Applications
The MK-8 is deployed primarily in coal chemical plants, integrated steel mills, coke oven battery QC labs, and third-party testing institutes performing routine quality surveillance of metallurgical coke. Its outputs directly inform blast furnace burden optimization—M40 correlates strongly with coke reactivity index (CRI) and post-reaction strength (CSR), while M10 predicts fines generation during charging and impacts permeability of the cohesive zone. Secondary applications include evaluation of alternative carbonaceous materials (e.g., biomass-derived char, synthetic coke blends) where mechanical robustness under thermal stress remains a key selection criterion. When paired with JXS-series mechanical sieves, the MK-8 enables fully standardized, operator-independent determination of coke size distribution (CSD) profiles per GB/T 2005—critical for optimizing coke oven charge density and minimizing dry quenching losses.
FAQ
What standards does the MK-8 comply with?
It is engineered and validated exclusively to GB/T 2006–2002, with design elements consistent with ISO 5012:2014 and functional equivalence to ASTM D3417 for mechanical strength assessment.
Is the drum speed adjustable?
No—the rotational speed is fixed at 25 rpm to fulfill the 100-revolution requirement in 4 minutes ±10 seconds as mandated by GB/T 2006. Speed deviation invalidates test compliance.
Can the MK-8 be used for non-metallurgical coke?
Only if the application explicitly references GB/T 2006 or equivalent national standards; results for activated carbon, foundry coke, or fuel-grade coke lack normative interpretation without supplementary correlation studies.
What maintenance is required?
Monthly verification of timer accuracy and screen aperture dimensions; biannual inspection of drum weld integrity, bearing lubrication, and belt tension (if belt-driven); annual torque verification of angle steel mounting bolts.
Are replacement screens supplied with the unit?
No—60 mm, 40 mm, 25 mm, and 10 mm round-hole steel screens are optional accessories; each must be independently certified to dimensional tolerances specified in GB/T 2006 and recalibrated monthly.
