YPT Radial Stacker Conveyor

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Smart Stockpiling with Precision and Reach

YPT Radial Stacker Conveyors

A Radial Stacker Conveyor is a bulk material stacking machine used to build large stockpiles by rotating (slewing) around a pivot point and depositing material over a wide arc.

It typically consists of a conveyor boom mounted on a base that allows the boom head (discharge) to revolve radially around the tail (feed) point.

This motion allows a single machine to create a wide, conical or kidney-shaped pile, often with higher storage density than fixed stackers.

Areas of Application

Radial stackers are widely used in industries handling large volumes of bulk material, including:

  • Mining and aggregates:

    for stockpiling sand, gravel, crushed rock, ore, coal.

  • Ports and terminals:

    for loading/unloading stockpiles and storage of bulk cargo.

  • Power plants and biomass handling:

    where large quantities of bulk fuels (coal, biomass) need to be stockpiled with minimal material degradation.

  • Reclamation yards and material processing plants:

    where flexibility in stockpile geometry and footprint is required.
Because the radial motion of the boom allows wide coverage, these machines maximise land use efficiency and reduce the need for multiple stackers or frequent relocation as pile height increases.

Principle of Operation

  • Feed & belt transport:

    Material is delivered (often by a feed conveyor or hopper) to the tail of the radial stacker. A conveyor belt carries the material to the discharge boom.

  • Boom discharge:

    The boom extends from the pivot point and discharges material at the head end. The height may be fixed or adjustable (luffing) to control pile shape and maintain discharge distance.

  • Radial (slewing) motion:

    The entire boom or discharge head rotates around the central pivot (slewing ring / turntable). As the boom pivots, the discharge point sweeps an arc, allowing the machine to build a wide pile.

  • Pile formation:

    By controlling boom height, rotation speed, feed rate and belt speed, the machine builds a conical or kidney-shaped pile in layered fashion, optimizing storage volume and minimizing segregation.

  • Mobility (optional):

    Some radial stackers are mobile (wheeled or tracked) and can be repositioned to new pile zones or removed when not needed.

Efficient Stacking. Maximized Space

YPT Radial Stacker Conveyor Highlights

Controlled Mobility for Optimized Yard Layouts

Design Criteria

Material characteristics:

lump size, bulk density, moisture content, abrasiveness. These determine belt selection, feeder design, chute protection and boom design.

Capacity (tons per hour) and required stockpile volume: :

determines belt width, belt speed, boom length and radial arc.

Boom length and discharge height:

A longer boom or higher discharge height allows taller piles and larger footprint; but increases structure and cost.

Slew arc and rotation mechanism:

Determines the coverage area of the stockpile and the mechanical complexity (slewing bearing, motors, gearboxes) and structural loading.

Structural design of boom and base:

Must withstand static loads (material on the belt), dynamic loads (rotation, start/stop), wind load, fatigue from unloading cyc¬les.

Mobility / relocation requirements:

For portable radial stackers, design includes wheels/tracks, folding booms, quick-connect electrical and mechanical systems.

Dust, spillage and environmental control:

Because of large volumes and rotational motion, dust suppression and sealing are important design considerations.

Technical Specifications

PBoom Length:

~15 m to ~50 m+Longer for larger piles.

Belt Width:

~600 mm to ~1,200 mm (24″-48″)Depends on tonnage & material size.

Capacity:

Several hundreds to >3,000 t/hIn aggregate, radial stackers can push ~3,000 t/h

Slew Arc (Rotation):

Up to ~270°Wide arc increases pile footprint

Discharge Height:

Typically adjustable up to ~10-20 m+For tall stockpiles without high power cost.

Angle of Incline:

Up to ~20° or more for incline beltsSome radial stackers operate on graded belts.

Mobility Feature:

Wheels / tracks, foldable boomFor mobile applications

Important Considerations:

  • When designing, consider the tail pivot location in relation to the feeding conveyor and ground bearing pressure under the pile – a poorly placed tail can reduce storage capacity. (“Maximum height of stockpile … about 18 m … with 60° arc of travel … about 61,000 t”)

  • Boom rotation speed:

    Too fast sweep can cause instability of material discharge or segregation; design for proper slew rate.

  • Material segregation in stockpile:

    Use boom height/luffing and radial layering to minimize coarse/fine separation.

  • Mobility vs fixed cost:

    Mobile radial stackers include undercarriage, leveling, folding booms, which adds cost; if the stockpile zone is permanent, a fixed installation may be more cost-effective.

  • Maintenance of slewing mechanism:

    Many failures occur in slewing ring bearings due to poor lubrication, contamination, or heavy duty cycles.

  • Dust & spillage control:

    Because the boom rotates and can extend high above the pile, spillage and dust generation must be managed with robust chute design and skirt sealing.

  • Platform and fall-protection design:

    Operators may need to access boom or discharge head at height; integrating safe access early pays off.

  • Lifecycle cost:

    Pile shape, liner wear, belt wear, slewing wear all affect lifetime; get vendor reliability data for large installations.