Frequently Asked Questions About Screw Conveyor Hanger Bearings

1. What is a screw conveyor hanger bearing?

A screw conveyor hanger bearing is an intermediate bearing used to support the internal screw shaft between two screw sections. It helps keep the rotating screw properly aligned and prevents it from touching the conveyor casing.

2. What is the purpose of a hanger bearing?

The hanger bearing supports long screw assemblies, reduces shaft deflection and maintains clearance between the rotating screw flights and conveyor body.

3. Where is a hanger bearing installed?

A hanger bearing is installed inside the screw conveyor at the joint between two internal screw sections. It is supported by a hanger frame connected to the conveyor casing.

4. Does every screw conveyor require a hanger bearing?

No. Short screw conveyors may operate with only drive-end and tail-end bearings. Longer conveyors made from multiple screw sections may require one or more intermediate hanger bearings.

5. What is another name for a hanger bearing?

A hanger bearing may also be called an intermediate bearing, centre bearing, screw conveyor support bearing, suspension bearing, journal bearing or plain bearing.

6. How does a screw conveyor hanger bearing work?

The coupling shaft rotates inside the hanger-bearing surface. The bearing supports the rotating shaft while allowing the connected screw sections to rotate and transfer material through the conveyor.

7. Is a hanger bearing a ball bearing?

Most traditional hanger bearings are plain, sleeve or journal-type bearings. Special ball-bearing or roller-bearing hanger arrangements may also be used for suitable applications.

8. What materials are used for hanger bearings?

Common hanger-bearing materials include:

UHMW polyethylene

Nylon

Engineered plastic

Wood

Bronze

Hard iron

Ceramic

Composite material

Graphite-based material

The correct material depends on the conveyed product, speed, temperature, load, abrasion and lubrication conditions.

9. Which hanger bearing is suitable for cement screw conveyors?

A cement screw conveyor requires a bearing material that can tolerate fine, abrasive cement dust and the selected operating speed. The final material should be selected according to the conveyor design and manufacturers recommendation.

10. Can hanger bearings be used for fly ash?

Yes. Properly selected hanger bearings can be used in fly ash screw conveyors. The fine and abrasive nature of fly ash must be considered when selecting the bearing material and shaft hardness.

11. What is the difference between a lubricated and non-lubricated hanger bearing?

A lubricated hanger bearing receives grease or oil to reduce friction and wear.

A non-lubricated or self-lubricating bearing uses a suitable low-friction material and may be preferred where lubricant could contaminate the conveyed product.

12. Does a cement screw conveyor hanger bearing require lubrication?

It depends on the selected bearing material and design. Some metallic bearings require controlled lubrication, while certain plastic, wood, composite or graphite-based bearings are designed for dry operation.

13. Can excessive grease damage a hanger bearing?

Excessive grease can attract cement dust and create abrasive buildup around the bearing. The correct lubricant type and quantity should be used according to the bearing design.

14. What is a hanger-bearing frame?

The hanger-bearing frame is the structural support that holds the bearing at the centre of the screw conveyor casing. It maintains the correct position of the coupling shaft and bearing.

15. What is a coupling shaft in a hanger-bearing assembly?

A coupling shaft connects two internal screw sections. It passes through the hanger bearing and transfers rotational torque from one screw section to the next.

16. How many hanger bearings are required?

The number depends on the total conveyor length, screw-section length, casing design, shaft diameter, operating load and conveyor manufacturers arrangement.

17. What causes hanger-bearing wear?

Common causes include:

Abrasive material

Misalignment

Bent coupling shaft

Insufficient lubrication

Excessive lubrication

High operating speed

Overloading

Moisture or hardened cement

Incorrect bearing material

Worn coupling components

18. Why is the hanger bearing overheating?

Overheating may be caused by insufficient clearance, incorrect lubrication, misalignment, excessive conveyor speed, overloading, a bent shaft or unsuitable bearing material.

19. Why is the hanger bearing making noise?

Noise can be caused by worn bearing material, dry running, misalignment, loose hanger-frame bolts, damaged coupling shafts or contact between the screw and conveyor casing.

20. Can a worn hanger bearing reduce conveyor capacity?

Yes. A worn or seized bearing can increase resistance, overload the motor, disturb screw alignment and reduce the material-conveying performance.

21. Can a damaged hanger bearing cause the screw to touch the casing?

Yes. Excessive bearing wear can allow the coupling shaft and screw sections to move away from their correct centre position, causing the flights to rub against the casing.

22. How do I know when a hanger bearing needs replacement?

Replacement may be required when there is excessive shaft movement, abnormal noise, overheating, visible wear, increased motor load or contact between the screw flight and casing.

23. Can the hanger bearing be replaced without changing the complete screw?

Yes. In many screw conveyor designs, the worn bearing insert can be replaced separately after safely opening the conveyor and supporting the internal screw sections.

24. How is a hanger bearing replaced?

The conveyor must be emptied, electrically isolated and locked out. The inspection cover or casing section is opened, the screw sections are supported, the hanger frame is removed and the worn bearing is replaced with a matching component.

25. How should hanger bearings be aligned?

The hanger bearing must be centred with the drive shaft, coupling shafts, end bearings and conveyor casing. Incorrect alignment can cause rapid wear and screw contact.

26. How often should a hanger bearing be inspected?

Inspection frequency depends on operating hours, material abrasiveness, conveyor speed and maintenance conditions. It should be included in the plants preventive-maintenance schedule.

27. What is the price of a screw conveyor hanger bearing in India?

The price depends on the shaft diameter, bearing material, hanger-frame type, lubrication arrangement, conveyor size and required quantity.

28. Does RA Enterprises supply screw conveyor hanger bearings?

Yes. RA Enterprises supplies hanger bearings and related screw conveyor components according to the required shaft size, bearing material, conveyor model and application.

29. What information is required for a quotation?

Please provide:

Screw conveyor diameter

Coupling-shaft diameter

Bearing inner diameter

Bearing outer dimensions

Bearing material

Hanger-frame dimensions

Conveyed material

Conveyor speed

Required quantity

Existing sample, photograph or drawing

Delivery location

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