Complete Grinding Roller Unit for Vertical Roller Mills
The VRM grinding roller assembly is the complete grinding unit of a vertical roller mill. It consists of the roller shell (wear layer), hub, roller shaft, bearings, and seals—all assembled into a single unit. During operation, the hydraulic system pushes the roller assembly down onto the grinding table, and the roller rotates to crush and grind the material between the roller and the table.
Unlike a single roller shell, the grinding roller assembly is a complete, ready-to-install unit. When you order from AGICO, you receive the entire assembly—pre-assembled and tested. You do not need to source parts from multiple suppliers or worry about assembly errors.
AGICO has been manufacturing VRM grinding roller assemblies for over 20 years. We supply complete vertical roller mill grinding rollers for all major VRM brands, including Loesche, Pfeiffer, Polysius, ATOX, HRM, LM, and ZGM. Our grinding roller assemblies are used in cement plants, power stations, steel plants, and mining operations worldwide.
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Complete Assembly – What You Get
When you order a grinding roller assembly for vertical mill from AGICO, you receive a complete, pre-assembled unit—not a box of loose parts.
What’s Included:
- Roller Shell: Outer wear layer. High chrome, hardfacing, or ceramic composite.
- Hub: Core structure connecting shell to shaft. High-strength cast steel.
- Roller Shaft: Supports the roller through bearings. Alloy steel, hardened and tempered.
- Bearings: Double-row spherical + cylindrical bearings. SKF, FAG, or equivalent.
- Sealing System: Multi-stage sealing (labyrinth, lip, air seals) keeps dust out.
- Mounting Hardware: T-head bolts, disc springs, and all fasteners.
Why Choose a Complete Assembly?
Many suppliers sell roller shells and hubs separately. You buy the parts, then assemble them yourself—or pay a third party. This creates risks:
- Incorrect fit between shell and hub → Loosening, vibration, early failure
- Wrong bearing clearance → Overheating, bearing seizure
- Improper torque on fasteners → Loosening during operation
- No pre-assembly testing → Problems discovered only after installation
AGICO’s solution: We assemble and test every vertical roller mill roller assembly before it leaves our factory. You receive a ready-to-install assembly with verified fit, correct bearing clearance, smooth rotation, and confirmed seal integrity.
Do You Need a Roller Shell or a Complete Roller Assembly?
The correct replacement scope depends on the condition of the existing roller. Replacing only the roller shell may be sufficient when wear is limited to the outer grinding surface. A complete assembly should be considered when structural or rotating components are also damaged.
| Condition | Recommended Replacement |
|---|---|
| Only the roller shell is worn | Roller shell replacement |
| Hub mating surface is worn or deformed | Complete roller assembly |
| Bearing temperature or vibration is abnormal | Inspect bearings and complete assembly |
| Roller shaft is cracked, bent, or excessively worn | Complete roller assembly |
| Sealing system has failed and contamination has entered the bearings | Complete inspection; assembly replacement may be required |
| Existing assembly has an unknown maintenance history | Complete assembly inspection or replacement |
| A planned shutdown requires minimum on-site assembly work | Pre-assembled complete roller unit |
AGICO can review available drawings, operating data, inspection records, and photographs of the worn roller before recommending the replacement scope.
Custom Roller Assemblies for Different VRM Designs
Vertical roller mills from different manufacturers use different roller profiles, hub connections, shaft arrangements, bearing configurations, and sealing systems. A replacement roller assembly must therefore be manufactured against confirmed technical data rather than selected only by brand name.
AGICO can manufacture replacement grinding roller assemblies for Loesche, Pfeiffer, Polysius, ATOX, HRM, LM, ZGM, and other vertical mill designs, subject to drawing and dimensional confirmation.
For a new order, provide the VRM manufacturer, mill model, original drawing or part number, and available dimensions. When drawings are unavailable, the worn assembly may be measured for reverse-engineering evaluation. Final compatibility is confirmed through approved drawings before production.
Features of VRM Grinding Roller Assembly
Precision Shell-to-Hub Fit
Tapered mating surfaces machined for secure fit under vibration and thermal expansion.
Correct Bearing Clearance
SKF, FAG, or equivalent bearings assembled with controlled clearance and preload.
Multi-Stage Dust Sealing
Labyrinth, lip, and air seals protect the bearing area from dust and particles.
Pre-Assembled for Installation
Shell, hub, shaft, bearings, seals, and fasteners supplied as one complete unit.
Factory Rotation & Run-Out Testing
Rotation smoothness, dimensional accuracy, run-out, clearance, and seal integrity checked before shipment.
Compatible with Major VRM Designs
Custom replacements for Loesche, Pfeiffer, Polysius, ATOX, HRM, LM, ZGM, and other mills.
Technical Specifications
- Assembly Weight: 2–20 tons (depending on VRM size)
- Roller Shell Material: High Chrome Cast Iron, Hardfacing Alloy Steel, Ceramic Composite
- Hub Material: ZG270-500, ZG30SiMnMo, or as requested
- Shaft Material: Special alloy steel, hardened and tempered
- Bearings: SKF, FAG, or equivalent double-row spherical + cylindrical
- Roller Shell Hardness: HRC 55–58
- Sealing System: Multi-stage (labyrinth + lip + air seals)
- Pre-Assembly Testing: Dimensional check, bearing clearance, run-out test, seal check
- Compatibility: Loesche, Pfeiffer, Polysius, ATOX, HRM, LM, ZGM
- Customization: Yes, according to VRM model or customer drawings
Information Required for Quotation
To prepare an accurate technical proposal and quotation, please provide as much of the following information as possible:
- VRM manufacturer and mill model
- Original part number or assembly drawing
- Roller diameter, width, shaft dimensions, and installation dimensions
- Photographs of the existing roller assembly and worn areas
- Material being ground: raw meal, clinker, slag, coal, or mineral ore
- Existing roller-shell material and expected wear performance
- Bearing brand or bearing-model requirements
- Sealing-system requirements
- Quantity required
- Planned shutdown date or requested delivery schedule
- Required inspection standards and documentation
If drawings are unavailable, contact AGICO to discuss reverse-engineering evaluation based on the existing assembly.
Manufacturing & Assembly Process
AGICO follows a strict process from raw material to finished VRM grinding roller assembly:
- Component manufacturing (shell, hub, shaft)
- Heat treatment of all components
- Precision machining of mating surfaces
- Non-destructive testing (UT, MT, PT)
- Bearing selection and inspection
- Assembly – shell to hub (tapered fit)
- Assembly – hub + shaft + bearings
- Seal installation
- Rotation test and run-out check
- Final inspection and packaging
Every assembly is documented with a complete Assembly Test Report including all measurements and test results.
Request a Technical Proposal
Need a replacement VRM grinding roller assembly for your cement, slag, or coal mill? Send us your mill model, drawings, photographs, or existing part information. Our engineering team will review the replacement scope and prepare a project-specific technical proposal.
Applications
AGICO grinding roller assemblies are used in:
- Cement plants – Raw meal, clinker, and coal grinding
- Power stations – Coal pulverizing
- Steel plants – Slag grinding
- Mining industry – Ore grinding
Explore related VRM spare parts, including grinding table liners and rocker arms.
Frequently Asked Questions (FAQ)
Q1: What is the difference between a roller shell and a grinding roller assembly?
A: A roller shell is just the outer wear layer. A grinding roller assembly includes the shell, hub, shaft, bearings, and seals—fully assembled and ready to install.
Q2: Can I buy just the roller shell from AGICO?
A: Yes. AGICO supplies both individual roller shells and complete grinding roller assemblies. Choose what your maintenance plan requires.
Q3: How long does a complete grinding roller assembly last?
A: Service life depends on the material being ground, feed size, operating pressure, roller-shell material, maintenance condition, lubrication, bearing condition, and foreign objects. Actual service-life expectations should be confirmed for each project rather than estimated from a universal operating-hour value.
Q4: How do I know if I need a complete assembly or just a roller shell?
A: If only the shell is worn, replace just the shell. If the hub is worn, bearings are failing, the shaft is damaged, or the assembly has unknown history, replace the complete assembly. AGICO can inspect your worn assembly and make a recommendation.
Q5: Can AGICO manufacture a roller assembly for my specific VRM model?
A: AGICO can manufacture custom replacement roller assemblies for Loesche, Pfeiffer, Polysius, ATOX, HRM, LM, ZGM, and other vertical mill designs, subject to technical review. Final compatibility is confirmed through an approved production drawing.
Q6: What is the lead time for a grinding roller assembly?
A: Lead time depends on assembly size, material, bearing availability, manufacturing scope, inspection requirements, and order quantity. A project-specific production schedule is provided after drawings and technical requirements are confirmed.
Q7: Do you supply bearings with the assembly?
A: Bearings can be supplied as part of the complete assembly. SKF, FAG, or an agreed equivalent may be selected according to approved technical and commercial requirements.
Q8: Do you sell other VRM spare parts?
A: Yes. AGICO supplies a complete range of VRM spare parts, including grinding table liners, rocker arms, classifiers, roller hubs, and bearings.
