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Thrust Roller Set
Hardened alloy steel rollers that control axial drum position and prevent migration along the drum axis.
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At a glance
| Roller Material | Alloy steel, EN 9 / AISI 1045 equivalent |
|---|---|
| Contact Face Hardness | 50–55 HRC (induction hardened) |
| Case Depth | 3–5 mm |
| Roller Diameter | 200–350 mm (7.9"–13.8"), capacity-dependent |
| Face Width | 100–200 mm |
| Face Squareness | ±0.1 mm to roller axis |
| Set Comprises | 2 thrust rollers with shafts, bearings, and housings |
| Operating Axial Force Range | 2–18 kN, capacity-dependent |
Overview
Thrust rollers — also called retaining rollers, check rollers, or thrust guide rollers — act on the side face of the drum riding ring to limit axial movement of the rotating drum shell. On an inclined drum (slope typically 2–5°), gravity and the reaction from material motion tend to push the drum downhill continuously. Two thrust rollers, one positioned on each side of the riding ring, provide the counter-force that keeps the drum centred within its design float band — typically ±10–20 mm from the neutral position.
Thrust rollers operate in a predominantly axial loading mode, unlike trunnion rollers which carry radial load. Because the contact force is intermittent and directional, thrust roller duty is generally less continuous than trunnion roller duty, but overloaded or misset rollers can produce significant heat and rapid riding ring face wear if left unchecked.
Function
Maintaining correct axial drum position keeps material retention time consistent, prevents drum shell lips from contacting feed or discharge seals, and avoids abnormal thrust loading on trunnion roller bearings. Thrust roller failure or disengagement causes the drum to creep axially until it contacts structural stops, damaging seals, feed chutes, and the riding ring itself — and potentially requiring a costly plant shutdown for drum repositioning.
Construction & quality
Forged or cast alloy steel body (EN 9 / AISI 1045 equivalent), turned and ground to diameter tolerance h6. The contact face is machined perpendicular to the roller axis to ±0.1 mm and induction hardened to 50–55 HRC with a case depth of 3–5 mm. The mounting boss is bored H7 for shaft fit. The full set includes two rollers, shafts, and spherical roller bearings in split plummer-block housings. Grease nipple provision is standard on all housings.
When to replace
- Step wear or circumferential grooving on the thrust face contact surface
- Drum exhibiting persistent axial drift to one side despite confirmed roller contact
- Abnormal heat generation at the thrust roller housing detected by touch or infrared thermometer
- Riding ring side face showing circumferential grooving or burnishing from concentrated contact
- Bearing seal discoloration or grease purge indicating overloading of the bearing
Compatibility & fitment
Avelta thrust roller sets are dimensioned to match riding ring face width and drum axis inclination on AVL-DMP plants from 60 to 200 TPH; OEM and cross-fit sets are supplied per customer drawing and drum specification.
Why buy from Avelta
Contact faces are ground perpendicular to OEM tolerance after heat treatment, ensuring full-face contact with the riding ring and preventing edge loading that accelerates premature face wear and bearing failure.
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