Prochem Pvt Ltd



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Screw Conveyor

screw conveyorsProChem Screw Conveyors are available in a wide range of styles for general conveying applications as well as for silo discharge duties. Single units with variable pitch augers or multiple auger units for difficult products may be used to assist the discharge of materials with poor flow properties from silos. A wide range of features are available:

  • Heavy duty construction ex mild steel, SS304/316 or special alloys
  • Customised designs to suit each application
  • Sanitary design to dairy standards
  • Polished internal / external surface
  • Outboard bearings and packed gland / air purged shaftseals
  • Tubular / trough designs with access and inspection covers
  • Elevating screws
  • Variable pitch augers to encourage mass flow
  • Half pitch augers to prevent flushing of free flowing fluidised products
  • Double flight designs to provide even continuous discharge rates
  • "Live Bed" multi auger designs for cohesive or easily bridging products
  • Tapered, ribbon, cut flights and paddles for special applications
  • Reverse flights at discharge ends to assist discharge and prevent compaction
  • Suitable for Indoor or Outdoor applications
  • Multi inlet / outlet designs to suit special applications
  • TEFC AC gear motor drive - direct or chain drive
  • Motor options - Standard, Flameproof, Exe, DIP, voltages to suit
  • Wide choice of additional options such as demountable/sanitary options, access covers, drive, bearings, shaft seals, shear pins and safety features.


Screw Conveyor


flexible screw conveyorProchem's Fexible screw conveyors offer efficiency and versatility, conveying bulk materials ranging from large pellets to sub-micron powders—both free-flowing and non-free-flowing—with no separation of blended products.

Mobile and custom configurations Available

All screw conveyors are available on caster-mounted frames with conveyor support masts for in-plant mobility, reducing the need for multiple stationary units.

Both mobile and stationary units are readily customized using interchangeable screws, conveyor tubes, motor drives, hoppers, flow-promotion devices, sensors, controllers, and other components to satisfy the most diverse and demanding end-use requirements.

Principle of Operation

Prochem's screw conveyor consists of a spring steel or stainless steel screw that is enclosed in a or rigid plastic tube, or a rigid steel tube, and driven by an electric motor normally located at the discharge end of the conveyor. This simple design delivers efficient performance and high reliability while reducing maintenance and cost. When properly engineered according to the specific characteristics of the material being conveyed and the process into which it will be integrated, a screw conveyor can outperform rigid screw conveyors, bucket elevators, drag chain conveyors, aero mechanical conveyors and other equipment intended to transport powder and bulk solid materials.

The intake end of a screw conveyor tube is typically equipped with a charging adapter, a U-shaped trough that connects to the outlet of a hopper or directly to the outlet of process equipment such as a bulk bag discharger, bag dump station, grinder, crusher, screener, blender, reactor or storage vessel of any kind. 

Screw Conveyors  passes through the charging adapter trough, exposing a section of the screw to material flowing into the trough from above. When rotating, the exposed section of screw feeds material into the outer tube, where it is then propelled through the tube by the enclosed portion of the screw.

A phenomenon resulting from the loose fit of a rotating screw within a tube filled with bulk material, is that the screw automatically self-centers within the tube, providing clearance between the screw and tube wall. This affords sufficient space for particles to flow without damage, depending on the fragility and size of particles being conveyed.

A removable clean-out cap covers the intake end of the conveyor tube, permitting rapid emptying and flushing of the tube, as well as disassembly and wash-down of components.

Because the intake end of the screw requires no bearing, and since the discharge end is coupled to the motor drive above and/or beyond the point at which material exits the discharge spout, material does not come in contact with seals or bearings. The screw is therefore the only moving part contacting material.


  • Economical to purchase, install and operate
    Prochems screw conveyor  does not require the internal and external components that can make other conveyors expensive to build and operate. The only moving part contacting material is the rugged screw that resists wear and fatigue, resulting in extraordinary reliability and minimal maintenance.
    Because the screw and tube are , and can be routed easily in any direction, the intake and discharge can be positioned where you need them, in situations that would be difficult, costly or impossible to satisfy with other conveyors. Rugged screw
  • High reliability, low maintenance
    Prochem's screw conveyor has no internal bearings, cables, filters, chains, buckets, or other potentially problematic components to wear, break down, or require maintenance. The only moving part contacting material is a rugged screw which resists wear and fatigue, and is driven by an electric motor.
    Even under a full load of moist, dense product — depending on application parameters — a screw conveyor can start and stop repeatedly with no binding or damage to the unit. The result is a conveyor without load limitations that runs dependably, boosting productivity while cutting maintenance. Screw Conveyor - Quick Shipment
  • Only one moving part
    The only part contacting material in a screw conveyor is the rugged screw which is driven by an electric motor. As it rotates, the screw propels material and self-centers within the conveyor tube, providing constant clearance between itself and the tube wall.
    This simple design does not require cables, chains, disks, internal bearings, and numerous moving parts found in bucket elevators, rigid augers, drag chains, and/or aeromechanical conveyors—parts that can add initial cost, require maintenance, wear out, breed contamination, and/or break down.
  • Convey in any direction
    Whereas many conveyors (such as rigid screw conveyor, bucket elevator, drag chain conveyor and aero mechanical conveyor designs) have limited angles of incline and/or straight-only conveying paths, screw conveyors can move material vertically, horizontally, or at any angle—over, under, or around obstructions, through small holes in walls or ceilings.
  • Gentle product handling and blending
    Prochem's screw conveyors can handle your products gently, because the screw self-centers as it rotates. This can provide ample clearance between the screw and tube wall to prevent grinding, crushing, and other product damage.
    In addition, the gentle rolling action created by the screw prevents the separation of blends throughout the entire length of the conveyor.

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Prochem Turnkey Projects Pvt. Ltd. (India)

Tel: +91 20 27462656, Mail:

Prochem Turnkey Projects Pvt. Ltd.

P.O.Box 2579, Al-Jubail - 31951, Kingdom of Saudi Arabia Tel: +966 13 363 2387, Mail: