SERVA Back to homepage
Français   English   Deutsch
Your specialist in mechanical conveying of bulk products for over 50 years
Home » Know-how : 1/5. Screw conveyors (tubular or trough)

1/5. Screw conveyors (tubular or trough)

Our Archimedean screw conveyors are specially designed to carry, extract and dose dry, non-volatile bulk products, and they are available with numerous options and variants to suit the product typology and the work environment.

Download the brochure


Download the brochure
Download the brochure (pdf)
If you haven't yet installed Adobe® Reader®, which is necessary to read PDF files, you can download it free of charge by clicking on the link below :
Adobe Reader

Tubular screw conveyors

Pipe screw conveyors are specially designed to carry and dose dry, non-volatile bulk products. They take the form of a closed tube inside which a worm screw rotates: an Archimedean screw. Because they are sealed, they limit dust emissions. These conveyors are simpler items of equipment than trough conveyors. They can be installed at steeper slopes and hence take up less room for a given output. <	Tubular screw conveyors

  • Output: 1 to 100 cu. m/h
  • Length: up to 20 m
  • Diameter: up to 500 mm

Trough screw conveyors

 Convoyeur en auge Conveyors in troughs are especially well suited to carry dry, powdery or fouling bulk products (beet pulp, wood pulp, organic waste, etc). Trough conveyors are the easiest to repair. They are mainly used in industries with high production level requirements, in which it is important to keep the installation running continuously (such as quarries or cement works). The covers on this type of conveyor can be dismantled or removed, providing easy access to its internal elements (screws, intermediate bearings, etc.). They also enable rotor replacement from above and not via the end, thus reducing the space required and facilitating maintenance.

  • Output: 1 to 200 cu. m/h
  • Length: up to 40 m
  • Diameter: up to 1,200 mm

Your conveyor design

Click below to access our design form for your tailor-made conveyor:
Your conveyor design
Your conveyor design
» Find out more about Archimedean screw (french)...

General technical characteristics

An Archimedean screw is a conveying system consisting of a central rotor supported by a bearing at each end. Spiral blades are welded on the rotor, and intermediate bearings can be installed, depending on the length of the conveyor. A screw conveyor can be made up of a tubular or trough envelope, and feature, as required, a rotor with a continuous screw, a ribbon screw, paddle blades or a coreless screw.

Possible options and variants

  • Possibilities of fitting several inlets and outlets
  • ATEX and food grade components
  • Screw bed for extractor without hopper
  • Precise dosing option
  • Vertical screws
  • Anti-abrasion materials (Creusabro type)
  • Deposition welding solution to lengthen service life

Different types of screw used

  • Normal continuous screw
  • Coreless screw
  • Toothed screw
  • "Threaded" extractor screw
  • Others: secant blade shafts for extractors, 1,080 mm diameter twin-screw mixing shafts

3 possible functions


  • Extraction
  • Carrying
  • Dosing
Normal continuous screw Secant blade shafts for extractors Coreless screw Toothed screw 1,080 mm diameter twin-screw mixing shafts
Normal continuous screw Secant blade shafts for extractors Coreless screw Toothed screw 1,080 mm diameter twin-screw mixing shafts
Z.A. de la Ballastière • B.P. 4 • Route de Montmédy • 55150 DAMVILLERS • FRANCE  |  Tel. : +33 (0)3 29 86 05 32 • Fax : +33 (0)3 29 84 09 03
Legal Notice