Special Applications of Screw Conveyor

For Screw Conveyor, more common of the unusual material characteristics which require other than the recommended components are:

 

1.    Corrosive Materials

Components may be fabricated from alloys not affected by the material or may be coated with a protective substances.

 

2.    Contaminable Materials

Require the use of oil impregnated, sealed, or dry type hanger bearings. End shafts should be sealed to prevent entrance of contaminants from the outside. Due to necessity for frequent cleaning conveyor components should be designed for convenient disassembly.

 

3.    Abrasive Materials

These materials may be handled in conveyors, trough, or housings constructed of abrasion resistant alloys with hard surfaced screws. Lining of all exposed surfaces with rubber or special resins also materially reduces abrasive damage.

 

4.    Interlocking or Matting Materials

Conveying with standard components is sometimes possible by the use of special feeding devices at the conveyor inlet.

 

5.    Hygroscopic Materials

Frequently these materials may be handled successfully in a conveyor which is substantially sealed from the exterior atmosphere. In extreme cases it is necessary to provide jacketed trough or housing with an appropriate circulating medium to maintain the material at an elevated temperature. Purging of the conveyor with a suitable dry gas is also used in some installations.

 

6.    Viscous or Sticky Materials

Ribbon flight conveyor screws are most frequently used for conveying these materials although standard components may be specially coated to improve the flow of material.

 

7.    Harmful Vapors or Dusts

These materials may be safely handled in dust sealed trough, plain tubular housing, or gasketed flanged tubular housing with particular attention to shaft sealing. Trough or housing exhaust systems have also been successfully used in some installations.

 

8.    Blending in Transit

Ribbon, cut flight, paddle, or a combination of these screw types may be designed to produce the desired degree of blending, aeration or mixing.

 

9.    Explosive Dusts

The danger of this condition may be minimized in most installations by the use of components which are fabricated from non-ferrous materials and proper conveyor sealing techniques observed. Exhaust systems are also advisable for the removal of explosive dusts.

 

10. Materials Subject to Packing

This condition requires the use of aerating devices at the conveyor inlet when materials are pulverulent and a special feeder device when material particles are large or fibrous.

 

11. Materials which are Fluid when Aerated

This condition may be used to advantage in some installations by declining the conveyor system toward the discharge end.

 

12. Degradable Materials

Some particles that are easily broken or distorted may usually be handled in screw conveyor by reducing the speed and selecting a larger conveyor size sufficient to deliver the required volume of material.

 

13. Elevated Temperature

Components should be fabricated from high temperature alloys. Should the process be such that cooling of the material in the conveyor is permissible, jacketed trough or housing may be used at the inlet end to cool the material and standard components used after the point where material temperature has been reduced to a safe degree.

 

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