JKL-CFS Enclosed Dual-Rail Automatic Primary Sampler

1. General Description

The JKL-CFS (Cross Falling Stream – Straight Path Sampler) is a fully enclosed, heavy-duty dual-rail primary automatic sampler designed to collect representative samples from mineral streams in free-fall (falling stream), typically at transfer points between conveyor belts or chute discharges.

Its robust, fully sealed, heavy-duty design ensures:

• Equi-probabilistic sampling operation
• Elimination of delimitation and extraction errors
• High mechanical reliability
• Operational safety
• Compliance with international sampling standards

The unit is specifically engineered for medium and large-scale mining operations, including concentrate streams, crushed ore, mill feed, and dry tailings.

2. Operating Principle

The JKL-CFS operates under the full cross-sectional interception principle of the free-falling material stream, using a straight-path horizontal cutter that traverses the entire stream at constant velocity.

The system ensures:

• Complete cross-sectional stream interception
• Uniform cutter velocity during sampling
• Rectangular cutter geometry
• Proportionality between sampled mass and processed tonnage

This operating principle complies with the General Theory of Sampling (Pierre Gy) and the requirements of ISO 12743 – Sampling of copper, lead, zinc and nickel concentrates and CNAM-007 (Codelco Standard – 2009 Update)

3. Mechanical Configuration

3.1 Fully Enclosed System

The equipment is supplied fully enclosed to provide:

• Dust containment
• Protection of mechanical components
• Personnel safety
• Environmental contamination control
• Extended service life

It includes:

• Interlocked inspection doors with safety sensors
• Viewing windows for operational supervision
• Peripheral dust-tight sealing
• Flanged connections to upstream and downstream chutes

3.2 Dual Heavy-Duty Rail System

The JKL-CFS incorporates a dual heavy-duty rail support system, providing:

• Maximum structural stability
• Vibration elimination
• Perfectly aligned linear motion
• Uniform load distribution
• Increased durability under continuous operation

The carriage wheels travel over reinforced guide rails equipped with high-capacity sealed bearings.

This configuration is characteristic of JKL Heavy-Duty models (e.g., YP3R-150 technical references).

3.3 Heavy-Duty Bottom-Dump Cutter

The cutter is a heavy-duty Bottom-Dump type, designed for:

• Complete increment capture
• Automatic discharge via pivoting bottom gate
• Mechanical actuation at end-of-stroke
• Hermetic closure during sampling traverse

Technical Specifications:

• Rectangular cross-section geometry
• Symmetrical cutting edges
• Fabricated from ASTM A36 structural steel
• Internal reinforcement ribs for high load resistance
• Abrasion-resistant design suitable for coarse and abrasive materials

The bottom-discharge configuration ensures clean transfer to the secondary sample chute.

3.4 Drive System

The drive assembly is electro-mechanical and consists of:

• Three-phase TEFC gear motor
• Integrated electromagnetic brake
• Dual chain transmission system
• Inductive position sensors
• Constant speed control system

The system guarantees:

• Acceleration outside the material stream
• Constant traverse speed during sampling
• Adequate torque for continuous heavy-duty service
• Compliance with cutter speed limits (< 0.45 m/s) recommended by CNAM-007

4. Structural Design and Materials

• Main frame fabricated from ASTM A36 structural steel
• High-rigidity structural reinforcements
• Extra-Heavy-Duty structural classification
• Certified lifting lugs
• Sealed lateral compartments
• Integrated tubular structural guides

The engineering design complies with mechanical and structural criteria typical of EPC project specifications (e.g., PECC-2540-MET-021).

5. Integration within a Sampling Station

The JKL-CFS can be integrated with:

• Secondary samplers (falling stream or rotary type)
• Homogenizer-dividers
• Enclosed interconnecting conveyors
• Automatic rotary sample collectors
• Power and control panels

As typically configured in JKL fully automated sampling stations.

6. Regulatory Compliance

The equipment is designed to comply with:

• ISO 12743 – Sampling procedures for determination of metal and moisture content
• CNAM-007 Codelco – Sampling Station Design Conditions (2009 Update)
• CNAM-007 – 2009 update
• Applicable mechanical and electrical codes (ASTM, ANSI, ASME, CEMA, NEMA)
• Metallurgical accounting requirements aligned with AMIRA P745 guidelines

7. Technical Advantages of the JKL-CFS

• Fully enclosed heavy-duty design
• Dual-rail system for maximum structural stability
• High-precision Bottom-Dump cutter
• Elimination of delimitation and extraction errors
• True cross-stream equi-probabilistic sampling
• Reduced vibration and mechanical stress
• Low maintenance requirements
• Extended service life in abrasive environments
• Enhanced operational safety
• Reliable foundation for accurate metallurgical accounting

8. Typical Applications

• Concentrate discharge at port facilities
• Conveyor-to-conveyor transfer points
• Mill feed sampling
• Primary and secondary crushing circuits
• Small-scale and large-scale mining operations
• Commercial quality control systems

9. Technical Conclusion

The JKL Enclosed Dual-Rail Automatic Sampler – Model JKL-CFS constitutes a robust, precise, and standards-compliant engineering solution for obtaining representative samples from free-falling mineral streams.

Its combination of:

• Correct cutter geometry
• Constant cross-stream traverse motion
• Dual-rail structural support
• Heavy-duty Bottom-Dump cutter design
• Full enclosure system

Positions it as a high-performance sampling solution for modern industrial sampling stations designed to ensure accurate, repeatable, and auditable metallurgical accounting.