Coal Tumbler Test Machine for Coal Friability and Dust Index Testing

Product Overview

This coal tumbler test machine is a specialized laboratory instrument engineered to quantify the mechanical strength, friability, and dust generation propensity of commercial coal samples. By subjecting prepared particle fractions to standardized rotational tumbling forces, the system measures physical degradation through mean particle size reduction percentages, providing critical baseline data for coal handling, processing, and transportation.

Designed for demanding industrial testing environments, this equipment serves coal preparation plants, thermal power stations, metallurgical coke facilities, and independent quality inspection bureaus. It enables facility operators and researchers to evaluate fuel suitability, optimize pulverizer performance, and anticipate coal degradation during bulk shipping and transfer operations.

Built with heavy-gauge structural components and a precision-matched electric drive train, the unit ensures repeatable rotational kinetics across every evaluation cycle. Strict adherence to standardized rotational velocities and cycle counts guarantees dependable repeatability, empowering quality control laboratories to execute compliance testing with maximum operational confidence.

Detail & Parts

Key Features

• Standardized Rotational Velocity: The precision drive assembly maintains a stable rotational velocity of 40 r/min, ensuring constant kinetic energy transfer during every tumbling stage.
• Preset High-Capacity Revolution Control: An integrated electromechanical cycle controller terminates operation precisely at 2400 revolutions, automating standardized test execution without operator intervention.
• Durable Abrasion-Resistant Drum Assembly: Constructed from reinforced industrial carbon steel, the internal tumbling chamber resists abrasive wear from high-hardness raw coal and mineral inclusions.
• Reliable Electric Drive System: Powered by an efficient 0.37 kW industrial motor, this equipment delivers steady mechanical torque to maintain constant drum motion under variable sample mass distributions.
• Dual-Voltage Electrical Compatibility: The electrical architecture accommodates both 380V three-phase and 220V single-phase industrial power supplies at 50 Hz, facilitating straightforward integration across diverse laboratory environments.
• Precision Dust-Sealed Enclosure: Heavy-duty chamber seals prevent hazardous coal dust leakage during high-revolution agitation, maintaining a safe, clean laboratory environment and preserving total test mass integrity.
• Standard-Compliant Kinetic Geometry: The internal chamber dimensions and flight lifting configurations conform strictly to commodity coal evaluation protocols, preventing sample slippage and ensuring authentic impact tumbling.
• Simplified Sample Charge and Discharge: Ergonomic drum locking latches allow rapid access for loading initial sample charges and recovering post-test degraded fractions without material loss.

Applications

Technical Specifications

Primary Operational Parameters

Standardized Testing and Calculation Methodology

The evaluation process executed by this unit relies on strict physical degradation analysis in compliance with standard commercial coal sampling protocols. Prepared coal samples are sampled in accordance with the GB/T 475 standard method to obtain a representative, sized mass distribution.

1. Sample Preparation and Mass Recording: The representative coal sample is accurately fractionated through standard wire-cloth screens to establish the initial baseline particle size distribution and initial charge mass.
2. Tumbling Cycle Execution: The prepared sample charge is sealed inside the tumbling drum of the machine. The drive unit rotates the drum at a constant speed of 40 r/min until exactly 2400 revolutions are completed, requiring an automated run time of 60 minutes.
3. Post-Attrition Sieving: Following automated cycle termination, the coal charge is extracted and subjected to a standardized fractional sieve sequence to separate remaining coarse lumps, intermediate fragments, and newly formed fines.
4. Data Calculation: The individual fractional masses are measured on precision balances. By analyzing the mass proportions across each sieve fraction relative to the starting charge, technicians calculate the coal friability index and dust index representing the percentage reduction in mean aggregate size.

Mechanical Architecture and Safety Systems

The internal geometry of the testing drum features calibrated internal lifters that elevate coal particles during rotation, allowing them to drop repeatedly against the drum shell and each other. This motion closely replicates real-world mechanical degradation occurring inside transfer chutes, hoppers, and shipping vessels.

To safeguard laboratory personnel from inhalable fugitive dust, the drum closure incorporates an elastomeric gasket secured by heavy-duty quick-action clamping toggles. The structural frame is fabricated from structural carbon steel channels with anti-vibration footings, eliminating mechanical drift during high-revolution test runs.

Why Choose This Product

• Rigorous Methodological Compliance: Built precisely to satisfy national coal testing standards, this system produces accredited data that eliminates disputes between commodity suppliers, transport carriers, and end users.
• Precision Geared Kinetic Stability: Unlike belt-driven mechanisms prone to rotational slip and speed drift, the positive-gear transmission preserves an exact 40 r/min operational speed throughout the entire 2400-revolution test sequence.
• Heavy-Gauge Industrial Build: Featuring an abrasive-wear-resistant steel drum and industrial-grade structural framing, this unit withstands thousands of cycles of repetitive rock and coal impacts without drum deformation or dimensional warping.
• Integrated High-Accuracy Cycle Automation: The automatic counting and power cut-off architecture guarantees that every test batch undergoes exactly 2400 drum revolutions, preventing over-tumbling or under-tumbling caused by operator oversight.

Contact our technical engineering team today to receive a formal quotation, request technical documentation, or configure customized test equipment tailored to your laboratory's material evaluation standards.

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