Description for the Pressurised Screw Feeder.

SALIENT FEATURES:-

• The feeder trough in pressurized screw feeders is manufactured as a torsionally rigid sheet metal housing made of standard section lengths with connecting flanges, to which are bolted sturdy cover plates.
• There is also an inspection flap above the Casings, Drive Unit & Driven Unit.
• Abrasive materials can be handled by using manganese alloy steel, hard surface welding, fusion-cast basalt linings or material padding.
• Split end walls are bolted to the ends of the trough. This makes it easy to dismount the screw shaft once the metal cover plates have been removed.
• Intermediate supports are only required about every 6 meters. They are supplied loose for mounting during assembly.

Ø  The shaft exit points are usually sealed by gray cast iron stuffing boxes.

Ø  Special Sealing Chord and sealant is used in order to maintain the pressure.

• The screw shaft is designed as a solid shaft or a rigid tubular shaft with integrated end journals and a welded-on screw thread.

Ø  The end bearings are pedestal bearings with antifriction-bearing inserts.

Ø  When a screw shaft requires intermediate bearings for longer conveying distances. These are designed as easily replaceable units, the torque is transmitted by bolted couplings.

• We supply a plain bearing as standard with replaceable two-part, gray cast iron bearing shells. They can be set up for grease gun or central lubrication according to the operational conditions
• On request, we also supply antifriction bearings with split roller bearings in a sealed, grease-filled suspended housing.
• The drive comprises a standard geared motor unit.

Classification of Pressurized Screw Feeders :-

1) On the basis of Conveying Direction:-

• Right Hand Spiral
• Left Hand Spiral

2) On the basis Of Trough Type:-

• U Type
• Tubular Type..
• V Type 

3) On the basis of Flight Type:-

• Full Thread
• Band Thread
• Paddle Thread

4) On the basis of Shaft Type:-

• Solid Shaft
• Tubular (Hollow) Shaft

Pressurised Screw Feeder Specification

Advantages:-

• Independent Material reception
• Excessive Feeding
• Low Maintenance
• High temperature resistant ( up to 450?C )
• More than 1 inlet and Outlet possible
• Back fire chances in CFBC Boiler is averted.
• Because of closed trough easy fulfillment of safety regulations and environment protection. ( Dust & Dust Proof )