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Our Solutions and Processes for the Feed-Milling and Material Handling Industries

"Grain Tech has an extensive range of bulk materials and handling equipment to meet your needs!"


We are old hands in the materials handling field and will design handling systems to meet your needs. From a few pounds per hour to hundreds of tonne per hour Grain Tech has a solution with a commitment to superior performance at an economical investment. Apart from the well-known drag link conveyors, screw conveyors and bucket elevators we have unique handling equipment such as rotary metering feeders, volumetric blenders, bin activators and multi-way diverter valves.

Installation arrangements are detailed using the latest CAD design software operated by experienced engineers.


The image below illustrates what we can provide for your business.

Grain tech plant systems nz


*Click on a blue title to go to that section of this page


Bucket Elevators

Bucket Elevator nz 1

  • Available in capacity sizes from 15 m³/hr. through to 820 m³/hr.
  • Fitted with steel or plastic buckets according to requirements
  • Fire resistant and anti-friction roller cover fitted to the head pulley
  • Equipped with explosive resistant and back stop device
  • Incorporates heavy duty fabrication for corner folds and flanges
  • Fitted with high durability polyester belt and heavy duty
    threaded rod belt adjustment arrangement
  • May be fed on either the up leg or down leg according to application

 Optional belt alignment and speed monitoring

Stainless Steel Bucket ElevatorCarbon Steel Bucket Elevator nzBucket Elevator nz  width=Stainles Steel Bucket Elevator Boot nz





  • Heavy duty industrial series supplied in standard horizontal, inclined andEn mass drag conveyor nz
    combination horizontal / inclined configurations.
  • Each type available in sizes from 120 mm wide to 630 mm wide with
    capacities from 12 m3 / hr. to 1600 m3 / hr., in straight, 45 incline as
    well as “Z” pattern arrangements
  • Suited to handling a wide range of material types including cereals,
    grains, oil seeds, powders and prilled chemicals, cement, coal, minerals, sand, pellets etc.
  • Optional single and multiple infeed and discharge arrangements available
    to suit requirements.
  • Available in painted carbon steel and stainless steel finish.
  • Custom designed to suit each application.
En masse drag link conveyors nz Large capacity drag conveyors nz En masse drag conveyors nz







Drag Chain Conveyors

Steel Drag Chain Conveyors nz

  • Standard design series.
  • Available in capacity sizes from 30 m³/hr through to
    1600 m³/hr.
  • Heavy Duty folded and flange fitted design with bolt
    together fabrication.
  • Fitted with high tensile chain and UHMW Polyethylene conveyor flighting for stable, low noise running and long service life.
  • Multi point feeding and discharge to suit installation

    Drag Chain Conveyors nz

  • Incorporates heavy duty gear drive arrangement
    and chain adjustment mechanism
  • Equipped with safety over flow alarm





Z Pattern Bucket Elevators

Stainless Steel Z pattern Bucket Elevators nz

  • Available in capacities from 6.5 MTPH – 25 MTPH in six
  • Suited for incorporation into transfer applications where
    gentle handling is necessary such as seed and grain varieties,
    rice grain, specialty grain handling applications as well as
    finished product handling where non-degradation is required.
  • Head and boot assemblies and leg sections are designed
    and fabricated to provide optimum sealing and strength.
  • Dual inlet assemblies to meet process requirements.
Large Capacity Z pattern Bucket Elevators nz Bucket Elevators nz 3 Z pattern Bucket Elevators








Drag Link Conveyors nz

  • Available in capacities from 6.5 MTPH –
    25 MTPH in six sizes.
  • Suited for incorporation into transfer applications
    where gentle handling is necessary such as seed

    and grain varieties, rice grain, specialty grain
    handling applications as well as finished product handling
    where non-degradation is required.

    Super Flo Drag Link Conveyors nz

  • Head and boot assemblies and leg sections are designed
    and fabricated to provide optimum sealing and strength.
  • Dual inlet assemblies to meet process requirements.

Super-Flo Drag Link Conveyors nz Super Flo Drag Conveyors nz Super Flo Conveyors nzSuper Flo Drag Link Conveyors nz








Screw Conveyors

  • Capacity sizes from 10 m³/hr. through to 320 m³/hr.Screw Conveyors nz
  • Heavy duty fabrication with folded and flanged assembly
  • Cyclodrive gear unit c/w chain & sprocket transmission
  • Installed with intermediate hanger bearings and heavy Custom Screw Conveyors nz
    duty flange mounted bearings for the shaft spindles.
  • May be supplied with overflow safely cut out device


Screw Conveyors nz inlet Screw Conveyors nz flighting Screw Conveyors nz self cleaning

Metering Screw Feeders

Metering Screw Feeders nz Diagram

  • Capacity sizes from 10 m3 / hr. through to 800 m3 / hr.
  • Fitted with heavy duty variable pitched feed section
  • Heavy duty folded and flange fitted design with bolt
    together fabrication and assembly.
  • Optional direct drive or chain and sprocket transmission
    from a cyclo-drive gear unit.

Metering Screw Feeders nz Motor Drive

Metering Screw Feeders nz inletMetering Screw Feeders nz flightingMetering Screw Feeders nz carbon steel






Twin Screw FeedersTwin Screw Feeders Diagram nz

  • Capacity sizes from 20 m3 / hr. through to 800 m3 / hr.
  • Incorporates variable pitch flighting for the infeed section.
  • Fitted with flange mounted bearing sets complete with seals.
  • Optional direct drive or chain and sprocket transmission from
    cyclo-drive gear unit.

    Carbon Steel Twin Screw Feeders nz

  • Suited for high capacity metering feeding and batching



Rotary Dischargers

  • Capacity sizes from 5 m³/hr. through to 500 m³/hr.Rotary Dischargers Diagram nz
  • Suited for metering feed discharge into weigh hoppers
    and regulating material supply to processing applications.
  • May be supplies with either a single or a dual discharge
  • Heavy duty fabrication with welded and flanges bolt
    together assembly.
  • Rotor is driven from a cyclo-drive gear unit c/w V/S

Rotary Dischargers Diagram internal feature nz

Stainless Steel Rotary Dischargers nz








Bin Vibratory Dischargers


Stainless Steel Bin Activator nz
  • Proven worldwide to give continuous but controlled flow of difficult to handle materials from bulk storage silos and bins through the controlled use of vibration.
  • Eliminates possibility of ratholing, degradation and segregation of materials within the silo to ensure an even flow of material on a mass flow basis.
  • May be arranged with single or multiple discharge outlets.
  • Supplied as a pre-assembled unit ready to be bolted upto the silo or bin.
  • Ideal for regulated feeding to metering feed conveyors, rotary valves, weigh belt feeders, transfer conveyors and delivery to bulk tankers.
  • Available in a range to sizes and capacities from 600 mm ø – 3000 mm ø.
  • May be supplied in painted carbon steel and stainless steel fabrication.


Bin Vibratory Dischargers Diagram nz Carbon Steel Bin Vibratory Dischargers Diagram nz Bin Vibratory Dischargers Diagram nz 2 stainless steel vibratory dischargers nz

Rotary Distributors

  • Capacity sizes from 10 m3 / hr. through to 70 MTPH.Rotary Distributers Diagram nz
  • Suited to alternative spout sizes for 200 mm, 250 mm, 300 mm and 320 mm diameter.
  • Available with optional 4, 6, 8, 10, 12, 14 or 16 outlet from single inlet.
  • Heavy duty fabrication incorporating welded and flange fit bolt together components.
  • Convenient for simplifying bulk material multi-distribution transfer.

Rotary Distributers nz

Rotary Distributor nz

Carbon Steel Rotary Distributors nz

Bulk Storage SilosCarbon Steel Silos nz

Silos nz

  • Bolt together panel design suited for on-site assembly.
  • Capacities from 10 m3 through to 450 m3
  • Available with conical round outlet discharge or flanged
    hopper to suit various metering feed dischargers.
  • Fabrication is from heavy gauge carbon steel flanged
    panels designed for sealant and site blot together
    assembly complete with bolt together roof panel assembly
    and flanged conical hopper. The silo hip is fitted with heavy
    duty gusseted leg mounting assemblies suited to fitting the

    round section leg supports complete with bracing members.
    High tensile bolts in two rows are used to secure the panels
    on assembly. A top center inlet spigot is fitted and level
    sensor flanged cut outs are provided. OSH compliant hand
    railing, kick plates and access ladder complete with man
    protective cage is allowed for.

Silos nz 2Bulk Storage Silo Hopper nz 3Bulk Storage Silos Leg Connection nz






To meet the requirements for bulk handling, Grain Tech provides bolt together galvanized hopper bottom silos ranging from 3.5 to 22 meters in diameter and capacities of 5 - 5000 metric tons.

Steel Silos nz

Silo Arrangement nz

These silos may be elevated for bulk transport loading. Dust free discharge chutes may be fitted to bulk out loading silos to maintain clean transfer and out loading operations.

Square Steel Silos nz

Galvanised Hopper Silo nz

Slide Gate Valves

Slide gate valves diagram nz

  • Available in a wide range of sizes to suit different spouting
    requirements from 200 mm x 200 mm through to
    800 mm x 800 mm and capacities from 50 m³/hr. through to 800 m³/hr.
  • Heavy duty design with welded and bolt together fabrication 
  • Available with either pneumatic, electro-serve or manual activation 
  • Easily installed with low maintenance and reliable operation 




Steel Slide gate valves nz Slide valves nz Slide gate valves nz Stainless steel slide gate valves 

Diverter Valves

Diverter Valves Diagram nz

  • Available in sizes from 200 mm x 200 mm through to
    800 mm x 800 mm and capacities from 50 m³/hr. through to
    800 m³/hr. with 30° and 45° discharge angle.
  • Welded and flange fit fabrication with heavy duty flap
  • Available with pneumatic or electro-serve activation.
  • May be supplied with optional discharge configuration


Pneumatic Diverter Valves nz



pneumatic diverter valve nz

Steel Diverter Valves nz Round Diverter Valves nz Stainless Diverter valve nz










Air Cushion ConveyorsAir Cushion Conveyor nz


  • Capacity sizes up to 2500 m3 / hr.
  • Suited for long distance conveying applications
  • Smooth and reliable operation with consistent
    belt tracking
  • May be run in either direction and arranged to
    discharge at either end or centre point according to installation
  • Incorporates self-cleaning features and safety features
    including alignment sensing, pressure sensor, speed monitoring
    and choke sensing.
  • Suited for incorporation into a wide range of conveying
    applications where high capacity operation at a lower operating
    cost is called for.
Air Cushion Conveyor nz Long Distance Air Cushion Conveyor nz

Magnetic Separators

  • Capacity sizes from 10 MTPH to 100 MTPHMagnetic Separator nz
  • Five different sizes.
  • Rare earth bulb design installed up to a swing away door for ease of cleaning.
  • Magnetic field intensity = ≥ 3000 GS
  • Iron removal efficiency = ≥ 99%
  • Available with either stainless steel or optional carbon steel casing assembly.


Magnetic Separator Diagram nz











Special Application Bucket Elevators

Custom Bucket Elevator Diagram nz Customised Bucket Elevator nz

These bucket elevators are designed for gently handling seeds, grain, oilseeds,
pulses and similar products where degradation of the seed
and damage to the germination quality of the material
is to be avoided. The bucket elevators are also ideal for
incorporation within the rice milling, maize milling,
rice drying, maize drying and similar cereal grain
and seed processing applications where attritional product
damage is to be minimized and where cross-contamination
 is prohibited.

The main features of these bucket elevators are:

  • Special design elevator head section for lower linear velocity product discharge while avoiding backflow of product down the return leg.
  • Flanged double-entry fittings to the elevator boot section designed for gentle product entry and minimum deflection.
  • Rubber bonded head pulley and squirrel cage type tail pulley for optimum friction between the elevator belt and pulley drives.
  • Easily removed boot cleanout slide panel to enable complete cleanout from one line to another.
  • Large section removable inspection door fitted to the up-leg section to enable the easy inspection and wiping out of buckets where required.
  • Heavy-duty fabrication with sealed flanges for all
    elevator assemblies.
  • Controlled metering to either of the down leg or up leg
    boot section for versatile planning-in to the process
  • Finish is in a top enamel coat over a rust-resistant
    undercoat onto a prepared metal surface.


Pneumatic Conveying

  • Dedicated to providing competitive solid materials pneumatic handling solutions and services.
  • Positive dilute phase pressure conveying.
  • Negative dilute phase vacuum conveying.
  • Dense phase pressure pneumatic conveying
  • Bulk material unpacking conveying systems
  • Automatic ingredient metering + weighing systems
  • Capacities from a few hundred kg through to 30MT per hour
  • Complete range of pneumatic conveying equipment to suit new and retro fit installation applications
Pneumatic Conveying nz Pneumatic Conveying nz

Intake receiving conveyor (from pit)

Grain Tech can manufacture and supply suitable conveyors for drive over pit truck discharge. The system comes complete with:

  • Shallow profile hopper fabricated from carbon steel
  • Top drive over grid suitable for discharged ingredients to flow through complete with heavy-duty support members capable of supporting loaded truck and trailer units.
  • En-masse drag link design pick up conveyor
    • Horizontal in-feed with inclination for discharge into the following bucket elevator
    • Fabricated from heavy-duty carbon steel folded and welded casing suited for bolt-together assembly. High tension conveying chain fitted with UHMW flighting.
Intake receiving Conveyor nz

Intake receiving Conveyor nz from pit

Intake receiving Conveyor pit nz

Receiving Conveyor nz

Disc and Tube Conveyors

The tube chain conveyor is designed to continuously convey

Disc and tube conveyor nz

fine powder granules and bulk materials. It can be installed as
horizontal and vertical and standalone vertical arrangement

Delivery capacity: 0.4-300m3/h according to model & size
Max. Delivery Distance: 80m (horizontal); 60m (vertical)
Power: 0.2-30KW according to model & size

Tube Chain Conveyor System's Feature:

  1. Sealed Pattern: dust-tight
  2. Low Energy Consumption
  3. No dead areas
  4. No metal on metal friction
  5. Low maintenance cost
  6. Long life time operation
  7. Explosion and pressure shock resistant design 
  8. Possible to re-start in filled state
  9. Minimal grain or material degradation

    Disc and tube conveyor nz







Possible configurations:


Disc and tube conveyor nz configurations

Pneumatic Conveying Units

The vacuum conveyor is designed for industrial applications incorporating heavy-duty components and is the ideal transfer equipment, used for transporting powder and granular materials for feeding the materials directly into mixers, sifters and other processing equipment. It reduces the likely dust emissions and is GMP certified. It is widely used in the pharmaceutical, foodstuff, feedstuff, chemical and plastics industries and for general processing material handling applications. The capacity range is from 0.4-6 metric ton per hour.

Working Principle:

The vacuum conveyor consists of a vacuum unit (no oil, no water), feeding tube, PE filter, vacuum hopper, automatic control device, pneumatic discharging device and a compressed air pulsing unit.

The ZKS conveying units have the characteristics of low power consumption high capacity, low noise and reliable operation. It is the ideal type of equipment for transferring powder and granular materials to mixers and processing equipment including sifters, packers, reactors etc.


-Pneumatic receiver to be placed above hopper.
-Vacuum unit on the floor beside hopper

Pneumatic Conveying Unit nzPneumatic Conveyor nz















Integrated Control Systems

For reliable and efficient plant operation, GTE provides complete package Integrated Control Systems incorporating all necessary contactors, starters, overloads, mains switches, housed within easy accessed MCC units. PLC operational units complete with PC's and monitors together with custom software complete the pre-wired package ready for field wiring to the equipment items on site. This Integrated Control System arrangement enables greater installation economics and a significant saving in installation time requirements.


Grain Plant Control Systems nz

Grain Factory Control Systems nz

Integrated Grain Control Systems nz

Integrated Grain Plant Control Systems nz

Engineering Services

Over the past twenty-four years, we have completed projects throughout Australasia offering a total capability of design, project management, equipment supply, installation and commissioning within the bulk materials handling and associated cereals processing industries.

This approach has enabled customers to make the most cost-effective use of their resources according to individual specifications. Using our most up-to-date techniques and design software, we can meet your requirements.

The following images are a sample of the projects we have previously undertaken. 

Processing Engineering Services NZ

Food processing Services NZ

Grain processing Services NZ

Feed Processing Engineering Services NZ

Plant Engineering Services NZ

Factory Engineering Services NZ

Ingredient Processing Engineering Services NZ

Seed processing Engineering Services NZ

Powder processing Services NZ

Grain Tech Engineering Services NZ

Process Engineering NZ

Food Process Engineering NZ Example 12

Feed Process Engineering NZ

Powder process Engineering NZ

Grain process Engineering NZ

Seed process Engineering NZ

Plant Engineering NZ Example 17

Factory line Engineering NZ

Product Processing Services NZ

Product Processing NZ Example 20

 Grain processing NZ

Seed processing NZ

Powder processing NZ

Feed processing NZ

Process design Engineering NZ

Product line Engineering Services NZ Example 26

Product line Engineering NZ

Process line Engineering Services NZ

Process line Engineering Services NZ