How Double Row Slewing Bearings Are Applied in Mining Machinery?

What are Double Row Slewing Bearings?

Double row slewing bearings are heavy-duty rotary ring parts with two independent rows of rolling elements (usually steel balls) placed between an inner and outer ring.They safely support heavy axial forces,radial forces,and tilting moment loads all at the same time.

Core Basic Specifications

Materials:Ring forgings adopt 42CrMo & 50Mn alloy steel with full quenching treatment;rolling balls are high-strength GCr15 bearing steel with high surface hardness.Cages include standard carbon steel,high-temperature resistant brass,and lightweight self-lubricating engineering plastic.Size Range:Inner diameter 100-4000mm,outer diameter 150-450mm,overall structural height 50-400mm.Accuracy Grades:P0,P6,P5 industrial precision levels,matching heavy engineering equipment demands.Gear Types:Three standard series available:gearless (020),external gear (021/022),internal gear (023/024) to fit different hydraulic drive layouts.Sealing Solutions:Standard non-contact labyrinth seals for general environments;triple-lip polyurethane contact seals for muddy,dusty,splash-heavy harsh mining environments.Fluoropolymer seals are optional for special corrosive underground mine conditions.Lubrication Modes:Long-service lithium-based grease for routine surface mining operation;circulating oil lubrication for continuous high-frequency rotation heavy-load scenarios.Standard operating temperature range:-30℃-120℃,customized low-temperature grease down to -40℃ for alpine open pit mines.Delivery Cycle:Standard in-stock models ship within 7-15 working days;heavy-load dust-proof customized mining versions require separate lead-time negotiation.

What are Mining Machinery?

Mining Machinery refers to all heavy-duty equipment used in open-pit mines,underground coal mines,metal mineral mines and ore processing plants,covering mining excavators,rotary drilling rigs,mobile crushing stations,stacker-reclaimers for mineral stockyards,underground transport rotary devices and mine screening rotary platforms.All mining machines are equipped with large slewing turret assemblies that deliver 360° rotation for digging arms,ore loading booms and material handling frames.Mining working conditions are extremely harsh:open pits are filled with mineral dust,gravel impact and large day-night temperature differences; underground mines feature high humidity,muddy water and corrosive mineral slurry.During continuous mining operations,rotary components bear frequent heavy digging impact loads and large eccentric tilting moments from uneven ore piles.Ordinary single row slewing bearings are prone to raceway abrasion,clearance expansion and rust failure,which will lead to equipment rotation jitter,ore unloading deviation and long-term production shutdown.Thus,mining rotary equipment must adopt double row slewing bearings with ultra-high shock resistance,dust-proof sealing and long fatigue service life.

The features of Double Row Slewing Bearings

Two-Row Configuration:Features upper and lower raceways that distribute localized stress across dual lines of steel balls or rollers.

Same vs.Different Diameters:Available in same-diameter ball setups for simpler layouts or different-diameter ball designs (larger lower balls) to optimize high tipping-moment resistance.

Integrated Gearing:Frequently built with internal or external gear teeth cut directly into one of the rings to drive 360-degree rotation.

Induction-Hardened Raceways:Raceways are deep-quenched (typically HRC 55–62) to maximize surface wear resistance under severe mine shock load.

The applications of Double Row Slewing Bearings

Construction and Lifting Machinery

Tower and Mobile Cranes:Support heavy lifting loads and allow smooth 360-degree rotation.Excavators and Loaders:Manage heavy digging forces and shifting weights during earth-moving work.Concrete Pumps:Handle steady movement and mechanical stress on job sites.

Renewable Energy Systems

Wind Turbines:Used in yaw and pitch systems to turn the massive blades and nacelle toward the wind.

Solar Trackers:Help heavy solar panels follow the sun smoothly across the sky.

Marine and Port Equipment

Ship Cranes and Davits:Resist harsh sea conditions and off-center lifting loads.Port Handling Gear:Support loading and unloading heavy cargo containers safely.

Industrial and Specialty Uses

Rotating Tables:Used in factory assembly lines and heavy manufacturing platforms.Medical Systems:Provide stable,precise rotation in large scanning units like CT scanners.

Mining Machinery

Large mining excavator swing turrets,open pit drilling rig rotary bases,mobile crusher rotating frames,mineral yard stacker-reclaimer slewing supports and underground ore transport rotary devices all adopt double row slewing bearings as core load-bearing rotary components,bearing continuous heavy impact and dusty operation in open-pit and underground mining sites.

The Importance of Double Row Slewing Bearings in Mining Machinery

Strong Shock & Eccentric Load Resistance Adapts Mining Digging Conditions:Mining excavators and rotary drill rigs generate instantaneous heavy impact loads when cutting hard ore.The double-row ball structure distributes digging stress evenly on two groups of rolling elements,greatly reducing turret elastic bending deformation.It effectively avoids boom shaking and ore spilling risks during heavy mining operations,improving mining operation safety and efficiency.

Triple-Lip Dust & Mud Sealing Blocks Mine Mineral Dust:Custom triple-lip polyurethane sealing system blocks mine rock dust,muddy water and ore slurry from invading internal raceways.Compared with single row bearings,double row slewing bearings have thicker sealing fit gaps to prevent abrasive mineral particles from scratching rolling surfaces,drastically reducing bearing premature wear in high-dust open pit and underground mine environments.

Super Long Fatigue Life Reduces Mine Production Shutdowns:42CrMo fully quenched inner and outer rings boost anti-fatigue performance by over 30%,adapting millions of frequent start-stop rotation cycles of mining equipment.Fewer bearing replacement times cut mine equipment maintenance downtime and ore production loss caused by machine breakdown.

Multiple Gear Types Match Mining Hydraulic Drive Systems:Gearless,external gear and internal three structural series can perfectly match hydraulic reducer drive systems of mining excavators and stacking equipment.Mining machinery manufacturers do not need to redesign transmission structures,shortening equipment R&D and prototype testing cycles.

Wide-Temp Special Grease Fits All Mining Zones:Custom low-temperature anti-solid grease for northern alpine open pits and high-temperature resistant lubricant for tropical mines are optional.No grease dry-out or solidification failure occurs under extreme temperature differences,ensuring uninterrupted 24-hour mining production.

Compact Integrated Structure Simplifies Mine Machine Design:A single double row slewing bearing replaces multiple groups of single bearing combinations,cutting the overall thickness and dead weight of mining turrets.It saves installation space for underground narrow mining equipment and lowers the overall manufacturing cost of mining machinery.

Manufacturer of Double Row Slewing Bearings

Newbeetrans is a professional manufacturer specialized in mining customized double row slewing bearings.We supply full-size standard stock and heavy-duty dust-proof anti-shock slewing bearing solutions for open pit and underground mining equipment manufacturers worldwide.

Full Mining-Grade Inspection Standard:All inner and outer rings adopt integral forging + deep raceway quenching process; every mining dedicated bearing undergoes heavy impact compression,dust aging and muddy water sealing tests before delivery.

Diversified Mining Customization Service:Support 42CrMo wear-resistant alloy steel,triple-lip mine dust-proof sealing,mine wide-temperature grease,internal/external/gear three gear forms and large non-standard tailor-made models for mining excavator swing turrets and drill rig rotary bases.

Stable Fast Delivery:Standard series bearings are in stock for shipment within 7–15 days; mining customized bearing samples can be finished within 10–15 days based on drawing technical requirements.

Authoritative Quality Certification:All products comply with national heavy slewing bearing industrial standards,and SGS dust resistance & heavy load test reports can be provided upon customer request.

Global One-stop Technical Support:Complete cross-border global logistics service; professional bearing engineers provide load calculation,sealing and gear selection guidance for all mining rotary mechanisms.

For technical specifications,pricing,or custom bearing solutions:

Email:paul@newbeetrans.com

Website:www.newbeetrans.com