Screw Conveyor

Petrosadid: Screw Conveyor

PETROSADID Company is engaged in offering a wide range of Screw Conveyor, which is highly efficient, reliable and easy to operate.

• The Screw conveyors offered by us, are widely used for transporting and/or elevating particulates at controlled and steady rates.

• They are used in many bulk material applications in industries ranging from industrial minerals, agriculture (grains), pharmaceuticals, chemicals, pigments, plastics, cement, sand, salt and food processing.

• They are also used for metering (measuring the flow rate) from storage bins and adding small controlled amounts of trace materials such as pigments to granular materials or powders.

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Principle:

Using screw conveyor material is transported by rotation of helical screws which moves material in forward direction in tube from feed point to discharge point.

Screw Conveyor Components

Petrosadid: Screw Conveyor
Petrosadid: Screw Conveyor

Construction:

Consists of a U tube made up of steel. Two or more tubes can be joined together for travelling material to discharge point. Screw element: contains spiral blades called as flights. Made up of single sheet of metal twisted into spiral shape. Flights are welded into central shaft through hanger.

Bavel gears: Installed at the drive end and used for maintaining speed and rotation for shaft.

Hopper: used for feed arrangement. Discharge point is called as spout.

The views of the various flighting orientations below indicate which way product will move given the rotation indicated:

Petrosadid: Screw Conveyor
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Standard Sectional Flight Screw

most common. used to convey a wide variety of products.

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Ribbon Flight Screw

Used for conveying sticky, gummy or viscous substances, or where the material tends to stick to the flighting at the pipe. available in integral style (as shown) or post style ribbon.

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Cut Flight Screw

Used for conveying light, fine, granular or flaky materials. Also used for mixing material in transit or for removing grit and dirt from the grain, cottonseed, etc.

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Cut and Folded Flight Screw

Used to create a lifting motion with the material that promotes agitation and aeration while mixing.

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Sectional Flight Screw with Paddles

Used to mix material while being conveyed. Paddles may be fixed (welded in place) or adjustable pitch (bolt mounted, to provide different degrees of mixing).

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Paddle Screw:

Used for complete mixing or stirring material. Paddles may be fixed (welded in place) or adjustable pitch (bolt mounted, to provide variable degrees of mixing).

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Short Pitch Screw:

Used primarily in incline or hopper fed applications where the pitch is less than the diameter of the screw.

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Interrupted Flight Screw:

As with a “ribbon screw”, used for conveying sticky, gummy or viscous substances, or where the material tends to stick to the flighting at the pipe; but offers better throughput and flow consistency than a ribbon screw.

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Cone Screw:

Used to provide better “mass flow” (uniform discharge) from a hopper or bin above than screws with variable pitch alone.

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Shaftless Screw:

Similar to ribbon screws, used for conveying sticky, gummy or viscous substances, or where the material tends to stick to the flighting at the pipe. Also used with stringy products that would typically wrap around the screw pipe.

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Press Screw:

Typically surrounded by screens and used to press moisture from various products.

Applications:

Type it please

 

The advantages of Screw Conveyors:

• Screw Conveyors are compact and easily adapted to congested locations.

• They can be used to control the flow of material in processing operations which depend upon accurate batching.

• Screw Conveyors are versatile and can be employed in horizontal, inclined and vertical installations

• They can be used as a mixer or agitator to blend> dry or fluid ingredients, provide crystallization or coagulant action, or maintain solutions in suspension.

• They Operated at positive as well as negative pressure

• They can be sealed to prevent the escape of dust or fumes from inside the conveyor; or keep dust or moisture from entering from outside the conveyor.

• They can be jacketed to serve as a dryer or cooler by running hot or cold water through the jacket.

• They can be made out of a variety of materials to resist corrosion, abrasion or heat, depending upon the product being conveyed.

They can be outfitted with multiple discharge points.

Petrosadid: Screw Conveyor
Petrosadid: Screw Conveyor

Yellow parts in picture shows industrial screw conveyer.

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