Start with the MQY nominal diameter and project shell dimensions, then identify shell, end and trunnion liners, grinding media, bearing bushes, gear-drive parts, materials, drawing numbers and inquiry requirements.
This page follows CITIC HIC's published MQY nominal-diameter series and project dimensions. Overflow discharge is not treated as a grate-and-pulp-lifter arrangement.
The model suffix identifies the nominal shell diameter. Length, drive, support and liner arrangement vary by project.
| Model Series | Nominal Shell Diameter | Shell Length / Discharge | Required Checks Before Manufacturing |
|---|---|---|---|
| MQY-15 | 1,500 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-21 | 2,100 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-24 | 2,400 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-30 | 3,000 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-36 | 3,600 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-40 | 4,000 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-45 | 4,500 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-50 | 5,000 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
| MQY-55 | 5,500 mm | Published project dimensions include approximately 8,800 mm | Project, nameplate, general arrangement, supports and drive configuration |
| MQY-60 | 6,000 mm | Published project dimensions are approximately 9,750–11,500 mm | Project, nameplate, general arrangement, supports and drive configuration |
| MQY-67 | 6,700 mm | Published project dimensions include approximately 9,750 mm | Project, nameplate, general arrangement, supports and drive configuration |
| MQY-73 | 7,300 mm | Published project dimensions are approximately 10,680–12,500 mm | Project, nameplate, general arrangement, supports and drive configuration |
| MQY-79 | 7,900 mm | Published project dimensions are approximately 13,600–14,330 mm | Project, nameplate, general arrangement, supports and drive configuration |
| MQY-88 | 8,800 mm | Confirm against the mill shell length for the project | Nameplate, general arrangement, overflow discharge, supports and drive configuration |
Mills in the same nominal-diameter series may have different shell lengths, supports and drives. Parts are not interchangeable by diameter alone.
The MQY overflow ball mill system covers shell liners, lifters, end liners, feed-chute liners, trunnion liners and grinding balls. Grate-discharge-specific parts are excluded.
Shell Liner / Shell Plate
Protects the shell interior and works with lifters to control the movement of grinding balls and material. Confirm the arrangement, curvature, thickness, hole spacing, shell diameter, rotation direction and adjacent liners.
Material Selection: Confirm Cr-Mo alloy steel, high-chromium cast iron, rubber or composite liners according to impact, abrasive wear, slurry corrosion and shell zone.
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Lifter Bar / Lifter Plate
Lifts grinding balls and material and controls their trajectory. Confirm lifter height, profile, pitch, arrangement, hole pattern, shell diameter and rotation direction.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, rubber or composite construction according to impact energy, wear zones and service-life target.
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End Liner / Head Liner
Protects the feed-end or discharge-end head. Confirm the end, inner or outer ring, segmentation, curvature, hole pattern, rotation direction and interfaces with the throat or discharge structure.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, high-chromium cast iron or rubber-composite construction according to impact, wear and end stress.
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Feed Chute Liner
Protects the feed chute and material-impact zone. Confirm flow direction, segmentation, thickness, curved surfaces, hole pattern, drop height and feeder interface.
Material Selection: Confirm quenched-and-tempered wear plate, high-chromium cast iron, rubber or composite wear construction according to drop impact, abrasive wear and replaceability.
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Mill Trunnion Liner
Protects the inner surface of the feed or discharge trunnion. Confirm the end, inside and outside diameters, length, taper, flange, hole pattern, rotation direction and adjacent structure.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, high-chromium cast iron or rubber-composite construction according to erosion, wear, corrosion and assembly method.
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Grinding Balls / Steel Balls
Grinding media subjected to repeated impact and wear. Confirm diameter distribution, ball consumption, mill size, speed, ore hardness, corrosion and breakage rate.
Material Selection: Confirm high-chromium cast balls, forged alloy-steel balls or other media systems validated for the duty according to impact, abrasion, corrosion and target particle size.
View Part Details →Check support and drive parts separately against the complete model, shell dimensions, journal, fits, gear parameters, material, heat treatment, lubrication and inspection requirements.
Trunnion Bearing / Bushing
Supports the mill trunnion and carries radial loads. Confirm journal diameter, bush inside and outside diameters, width, oil grooves, contact pattern, clearance, bearing housing and lubrication.
Material Selection: Confirm bearing bronze, Babbitt metal or the original sliding-bearing material according to bearing pressure, speed, temperature rise, lubrication and repair process.
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Girth Gear / Ring Gear
Meshes with the pinion to transmit the main drive. Confirm module, tooth count, pressure angle, helix angle, split joint, center distance, backlash and contact pattern.
Material Selection: Confirm cast steel or forged transmission alloy steel, heat treatment, machining accuracy, NDT and matched-pair inspection against the original design.
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Pinion
Meshes with the girth gear to transmit motor and gearbox output. Check module, tooth count, pressure angle, helix direction, shaft interfaces, backlash and contact pattern.
Material Selection: Confirm forged transmission-alloy steel and carburized or quenched-and-tempered heat treatment according to torque, tooth-surface hardness, core toughness and fatigue requirements.
View Part Details →MQY part numbers must be confirmed against the complete model, installation position and drawing revision. Numbers are not inferred on this page.
Selection Guidelines: Part numbers must match the model, shell dimensions and installation position. OEM drawing numbers and third-party part numbers are checked separately.
The overflow discharge arrangement differs from a grate-discharge mill. This page does not treat grates or pulp lifters as standard MQY parts; confirm the installed arrangement from the general arrangement and drawings.
No. Mills in the same nominal-diameter series may have different lengths, end configurations, liner arrangements, hole patterns, rotation directions, supports and drives. Confirm the project and drawings.
Submit the nameplate, shell diameter × length, general arrangement, installation position, used part photographs, liner layout and critical dimensions to assess identification, dimensional survey and manufacturing feasibility.
Provide the complete model, shell diameter × length, serial number, liner layout, drawings, used part photographs, materials and duty. We coordinate identification, material assessment, manufacturing selection, quality control and finished part delivery.
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