BALL MILL SHELL
Ball Mill Shells
Large welded rotating structures · Check shell sections, segments, flanges and liner holes together
The shell connects the mill heads, supports the shell liners and carries grinding media, material and rotating loads. ANRANST provides structural and drawing identification, material and welding-route assessment, weld and dimensional quality control, and manufacture to drawing.
Part scope
End flanges Connect the heads and establish end-face, register and hole geometry
Shell plates and welds Carry rotating loads, with internal integrity requiring verification
Liner hole pattern Locates liners, lifters and fasteners
Axial sections and circumferential segments Affect manufacturing, transport, site assembly and concentricity
The shell carries rotating loads; the liners provide internal wear protection
The shell connects externally to heads, the drive and attachments, while liners and lifters mount inside. Liners are replaceable wear parts; the shell is a welded load-bearing structure. Their materials, functions, manufacturing and acceptance requirements differ.
Check shell orders together with both heads, the rotation centreline, liner layout, drive position, manholes and foundation installation conditions.
Position and Performance
Geometric accuracy, weld quality, flange interfaces and hole patterns jointly affect stable operation
Check the complete rotating assembly when specifying a shell; outside diameter and length alone are insufficient.
End flanges and registers
Check outside diameter, end face, register, hole diameter and spacing, bolt circle, face runout and contact with the head.
Shell plate thickness and roundness
Check inside/outside diameters, plate thickness, roundness, straightness, local deformation and stiffness under operating loads.
Circumferential and longitudinal seams
Check joint preparation, welding procedure, heat input, post-weld treatment, weld profile, defects and NDT.
Liner fastening holes
Check hole diameters, spacing, layout, recesses, sealing, wear, cracks and consistency with liner drawings.
Shell sections, segments and site closure
Check locating datums, connections, joint misalignment, transport limits, lifting orientation and site assembly sequence.
Manholes, stiffening rings and attachment seats
Check opening reinforcement, stress concentrations, weld details, attachment loads and maintenance access.
OEM Structures and Specifications
Specify welded steel construction, axial section count and circumferential segment count
Manufacturer literature identifies structural options. Confirm steel grade, welding and dimensions against installation drawings.
Establish steel grade, plate thickness, welding consumables, preheat, postheat, post-weld heat treatment and acceptance levels through drawings, manufacturing specifications and inspection plans. Images alone cannot establish these parameters.
Failure Diagnosis
Analyse cracks, deformation, hole-area damage and flange deviations together
When shell damage is found, also inspect heads, liners, fasteners, drive, main bearings, alignment and operating records.
| Observed condition | Priority checks | Improvement Options |
|---|---|---|
| Cracks in welds or heat-affected zones | Loads, welding procedure, material, defects, stress concentration, alignment, loose liners and abnormal impact | Complete an engineering assessment, remove defects and restore structural continuity |
| Shell ovality or local deformation | Plate thickness, support, transport and lifting, weld distortion, operating temperature, grinding loads and measurement datums | Use the measurement report to define reshaping, repair or replacement scope |
| Worn liner holes or cracks around holes | Fastener preload, hole spacing, liner fit, sealing, impact direction and remaining section | Check hole areas, fasteners and the liner system together |
| End-flange steps or runout | Register, end face, hole pattern, heads, bolts, assembly sequence, concentricity and foundation condition | Restore end datums and the rotation centreline |
| Loose connections between segments or shell sections | Location features, contact surfaces, connections, preload, welds, site closure and operating records | Restore connections and geometric accuracy in the prescribed assembly sequence |
Drawing References and Inquiry Details
Identify shells by sections, segments, flanges, liner holes, welding and drawing revision
Provide the OEM drawing number, third-party reference, part number or customer drawing for the installed component, and confirm the revision.
Equipment identification
OEM, series, complete model, serial number, shell diameter, EGL, power, speed and modification history.
Structural identification
Integral construction or axial section count, circumferential segment count, longitudinal and circumferential seam positions, manholes, stiffening rings and attachment seats.
Drawing Number and Revision
Shell drawing number, rotating assembly number, third-party drawing number, part number, revision, project number and physical markings.
Main dimensions
Inside/outside diameters, overall length, EGL, plate thickness, section lengths, roundness, straightness, interfaces and transport dimensions.
Flanges and hole patterns
Flange outside diameter, register, end face, hole diameters and spacing, bolt circle, liner hole layout, head and drive interfaces.
Materials and inspection
Steel heat/batch, plate properties, consumables, WPS/PQR, welders, dimensions, welds, NDT and quality documentation.
Related Equipment and Parts
Connect shells with liners, heads, drives, equipment and OEM installations
General pages explain structure and manufacturing requirements; OEM pages identify the installed series. Drawing numbers, dimensions and quality plans complete the technical checks.
Shell Liners Check internal wear protection, liner layout and fastening holes.
Ball Mill Heads Check end flanges, registers, hole patterns and rotation centreline.
Girth Gears and Pinions Check drive position, mounting interfaces and gear centres.
General Ball Mills Information Review shell, liner, head and drive relationships.
Metso Select / Premier Ball Mills Check series, dimensions, shell sections and installation drawing numbers.
Materials, Welding and Inspection Review structural steel, welding and quality-control requirements.
Request a ball mill shell proposal and quotation
Provide the mill model, shell and assembly drawing numbers, axial sections and circumferential segments, key dimensions, welding and NDT requirements, and damage records.
Manufacturing Services in China
From Technical Assessment to Finished-Part Delivery
Technical advice, supplier introductions, quality control and finished-part delivery.
Technical Advice
Check sections, segments, drawing numbers, flanges, hole patterns, materials, welding and damage.
Supplier Introductions
Coordinate large plate rolling, welding, heat treatment, heavy machining and preassembly resources.
Quality Control
Monitor materials, welding, NDT, dimensions, roundness, hole patterns, flanges and interface inspections.
Finished-Part Delivery
Deliver shell sections and segments with position numbers, protection, lifting and transport arrangements, and complete quality documentation.