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Screw Conveyor Types | Helicoid Screw Flight | Ribbon Flight Conveyor Screws

Types of screw flight:
The screw of the conveyor may be right hand or left hand, the right hand type being the usual design. The threads of the screw may be single, double or triple.


The flight of the screws may be made in either of the two ways:
1. As Helicoids
2. As Sectional flight


Helicoids Flight:


They are formed from a flat bar or strip into a continues helix. The threads are thinner at the outer edge and thicker at the inner edge.


01-screw conveyor types- screw conveyor trough- screw conveyor theory- screw conveyor thrust bearings- screw conveyor torque-helicoid flights-continues helix-flight of screws


Sectional flights:


Sectional flights are formed from a flat disc and the thickness of the thread is uniform throughout. A continuous helix is made by joining a number of sectional flights together on a piece of pipe and butt welded them. Various styles of screw flights are in use, depending on the service required.


01- screw conveyor technology- screw conveyor incline- screw conveyor introduction- screw conveyor inlet- screw conveyor information- screw conveyor output-sectional flights-continuous helix-short pitch


Some of the typical configurations are:


1. Short pitch or continuous flight:

If the conveyor is required to handle dry granular or powdered materials that do not pack, this style of flight may be selected. It is of regular construction and recommended for inclined conveyors having a slope of 20 or more, including vertical conveyors. This style is extensively used as feeder screw.


2. Ribbon flight:

If the conveyor is to handle lumpy, clinging, sticky, gummy or viscous substances, this type flight may be selected. It consists of continuous helical flight formed from steel bar and secured to the pipe by supporting lugs.

01-screw conveyor part- screw conveyor pitch- screw conveyor power- screw conveyor length- screw conveyor layout- screw conveyor lift- screw conveyor loading-ribbon flight-cut flight


3. Cut flight:

In this type of flight screws have notches cut in the periphery of the flight. These notches supplement the conveying with moderate mixing action. They are recommended for conveyors required to handle light, fine, granular or flaky materials.

01-screw conveyor length- screw conveyor layout- screw conveyor lift- screw conveyor loading-cut flight-screw flight-sectional flight


4. Cut and folded flights:

This type of flight is characterized by notches as in cut flight, together with folded segments. This type of flight creates agitation and aeration resulting in better mixing. This type of flight is used to handle light or medium weight materials having fine, granular or flaky materials.

5. Some screw conveyors have cut flight with paddles mounted at regular intervals. The paddles counteract the flow of material past the flight resulting in greater agitation and mixing.

6. Sometimes screws are made of stainless steel to suit special requirements, like the sanitation requirements for handling food, drugs and other hygienic materials.

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Hi, I`m Sostenes, Electrical Technician and PLC`S Programmer.
Everyday I`m exploring the world of Electrical to find better solution for Automation. I believe everyday can become a Electrician with the right learning materials.
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