Steel Spiral Return Roller

This steel spiral return roller also called self-cleaning roller, it can clean the sticky material on the belt and protected build-up on the rollers. rollerconveyorsvn maintenance-free steel spiral return roller reduces downtime due to less carryback or less belt mistracking.

Spiral rollers, also known as "spiral rolls", are conveyor rollers with a modified shape of the roller shell. The running surface of the roller is shaped like a spiral (helix) thanks to special structures, laggings or coatings on the idler roller shell.

Such conveyor rollers are used as one of the possible solutions agains carryback. In this use case the cleaning of the conveyor belt from the bulk material particles adhering to the belt is to be improved or the falling particles of the conveyed material detached from the belt are to be conveyed to the side (see the explanations below). Spiral rollers are used both in the lower run of belt conveyors and in agricultural machinery. 

The spirals can have different shapes, dimensions and directions (left or right rotation) and can be made of different materials. Our portfolio includes conveyor rollers with spirals made of steel and wear-resistant polyurethane (PU).

We particularly recommend the rollers with PU spirals for use in the lower run of belt conveyors for bulk material handling.

SPECIFICATION
Roller Diameter: 89, 102, 108, 114, 127, 133, 140, 152, 159, 165, 178, 194, 219mm
Roller Length: 100-2400mm.
Shaft Diameter: 20, 25, 30, 35, 40, 45, 50mm
Bearing type: 6204, 6205, 6305, 6206, 6306, 6307, 6308, 6309, 6310
Surface Treatment: Electrostatic Powder Coating, Galvanization.
Standard: DIN, CEMA, JIS, AS, SANS-SABS, GOST, AFNOR etc.

RAW MATERIAL OF ROLLERS:
1.Pipe: High precision ERW special pipe with small out of roundness. Material Q235 equal to Europe S235JR
2.Shaft: High precision cold-drawn round bar, Material 45# equal to DIN C45.
3.Bearing: Deep groove ball bearing with clearance C3. Double Seal, Quality Grade P5Z3
4.Bearing House: Cold drawn steel plate, material 08AL equal to DIN ST12/14
5.Inner Seal: Lip type seal, Material Nylon.
6.Labyrinth Seal: Main Seal System, Material is Nylon.
7.Lubricating Grease: #2 Long lasting lubricating grease, working condition -20°c to 120°c
8.Surface Treatment: Electrostatic Powder Coating

FEATURES

1. Preventing material buildup, Self-cleaning, non-stick surface
2. Specially advantageous with sticky materials on return side;
3. Highly-effective labyrinth seals protected from dust & water into the bearing;
4. Designed and manufactured for a long, trouble-free life;
5. Maintenance-free, high-quality sealed ball bearing.

Conveying the bulk material to the side

Sometimes situations occur when the bulk material accumulates in particularly large quantities under the return rollers - so large that the accumulated bulk material already touches the rollers or the rollers threaten to dig in. This is a critical condition for the conveyor rollers, which can lead to premature wear and failure of the return rollers. The spiral conveyor rollers make a significant contribution to preventing such conditions.

The spiral works like a small screw conveyor and pushes the particles in a certain direction as the idler roller rotates. This successfully helps to avoid the problem of buried return rollers. The conveying direction of the spiral roller is defined by the shape of the spiral and the running direction of the conveyor belt.

Especially when installed in combination with a trough (similar to a screw conveyor), the spiral rollers make it easier to clean the conveyor of accumulated bulk material by conveying the trickling bulk material particles to a defined side and avoiding of their sedimentation under the belt.

APPLICATION
Mining
Steel mill
Cement plant
Power plant
Chemical Plant
Sea Port
Storage
etc.

CERTIFICATE
ISO9001, CE