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The mid-belt sampler is installed along the mid-section of a belt conveyor, positioned over a designated segment of the material-carrying belt. This mechanized sampling device is designed to automatically collect representative samples from continuously conveyed bulk material flows by sweeping the sampler’s cutting blade across the full cross-section of the material stream.
The sampler head rotates at preset intervals to extract a full cross-sectional sample from the moving conveyor belt. The collected material is directed through a chute to a primary belt feeder, which transfers it to a crusher. The crusher reduces the material to the required particle size without compromising moisture content, followed by sample subdivision via a precision splitter.
To meet diverse sampling requirements, customizable sampler configurations are available. Processed samples are stored in waterproof and dust-resistant containers, ensuring integrity during storage and transport. Residual materials in the sampling system are efficiently returned to the main flow through multiple pathways: free-fall return, screw conveyor, tubular belt conveyor, or bucket elevator.
1. Scraper-Type Sampling Head with Precision Design
The mid-belt sampler employs a stainless steel scraper-type sampling head, featuring a curved scraper plate that conforms to the arc of the material-carrying belt. This design ensures full cross-section sampling without damaging the conveyor belt, while maintaining consistent contact with the material flow.
2. Dual Safeguards Against Operational Interference
Mechanical and electrical dual safeguards prevent the sampling head from lingering or plunging into the material stream. Integrated position detection sensors and anti-empty sampling mechanisms ensure uninterrupted coal transportation and eliminate invalid sampling events.
3. High-Representativeness Sampling Across Flow Variations
The sampler achieves uniform material extraction regardless of flow rate fluctuations, ensuring representative samples for accurate quality analysis. Advanced dynamic compensation algorithms guarantee reliability under varying operational conditions.
4. Fully Automated Control & Unmanned Operation
The system is governed by PLC + host computer automation, enabling parameter configuration, real-time operational status monitoring, and data acquisition. This setup supports 24/7 unmanned sampling with centralized control and fault diagnostics.
5. Flexible Control Modes for Diverse Scenarios
Operators can select from automatic, manual, host computer, or remote control modes, adapting to specific site requirements. Remote access via industrial communication protocols (e.g., Modbus TCP) allows seamless integration into plant-wide management systems.
6. Moisture-Resistant Crushing & Anti-Blocking Technology
Equipped with wet coal-specific crushers, the system controls output particle size to 3–12 mm. An auto-cleaning mechanism prevents material adhesion, ensuring smooth sampling even for high-moisture or sticky materials.
7. Adjustable Splitting Ratio with Zero Systemic Error
The splitting ratio is programmable via PLC, covering a wide range (e.g., 1:10 to 1:100) with precision ≤0.37A. Adjustments can be made by modifying cutter rotation intervals or opening dimensions, ensuring flexibility for diverse material specifications.
