Quelle est la différence entre les manteaux et les blindages de bol ?

Les manteaux sont les composants d'usure mobiles montés sur l'arbre principal, tandis que les blindages de bol (concaves) sont la surface d'usure stationnaire dans le bol. Les deux travaillent ensemble pour créer la chambre de concassage et doivent être remplacés à mesure qu'ils s'usent.

Comment choisir le bon profil de blindage pour concasseur à cône ?

Le choix du profil de blindage dépend de la taille de l'alimentation, de la taille de produit souhaitée et des exigences de débit. Les blindages grossiers sont destinés aux alimentations plus grosses, les blindages fins aux produits plus petits. Nos ingénieurs peuvent recommander le profil optimal pour votre application.

Quels matériaux sont disponibles pour les blindages de concasseur à cône ?

ATF propose des blindages de concasseur à cône en nuances de manganèse Mn14, Mn18 et Mn22. Une teneur en manganèse plus élevée offre un meilleur écrouissage pour les applications abrasives. Nous proposons également des blindages avec inserts TiC pour les applications d'usure extrême.

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Spécifications clés

Bushing Alloys: C93200, C95400, C93700 bronze; Babbitt-lined
Bushing Hardness: 20-170 HB depending on alloy
Radial Clearance: 0.15-0.40 mm typical (model-specific)
Oil Film Thickness: 0.05-0.15 mm minimum operating
OEM Brands: Metso, Sandvik, Terex, Telsmith, Symons, FLSmidth
Operating Temperature: 40-65 deg C normal oil sump range
Standards: ASTM B505 (bronze), ASTM B23 (babbitt)

Bushing Material Options

Eccentric bushings are manufactured from bronze alloys selected for load capacity, wear resistance, and compatibility with the lubrication system. Material selection depends on the specific crusher design and operating conditions.

Eccentric Assemblies and Bronze Bushings for Cone Crushers — Comparaison des matériaux montrant les niveaux de dureté, les applications et les caractéristiques de performance
Matériau	Dureté	Application	Notes
C93200 Leaded Tin Bronze	60-70 HB	Standard main shaft bushings	Good load capacity, excellent lubricity
C95400 Aluminum Bronze	150-170 HB	High-load applications, heavy-duty crushers	Higher strength, good corrosion resistance
C93700 High-Lead Bronze	55-65 HB	Emergency bearing, contaminated lube conditions	Maximum embeddability, boundary lubrication
Babbitt-Lined Bronze	20-30 HB (babbitt)	OEM replacement where babbitt specified	Conformable surface, sacrificial wear layer

C93200 Leaded Tin Bronze

Dureté :60-70 HB

Application :Standard main shaft bushings

Notes :Good load capacity, excellent lubricity

C95400 Aluminum Bronze

Dureté :150-170 HB

Application :High-load applications, heavy-duty crushers

Notes :Higher strength, good corrosion resistance

C93700 High-Lead Bronze

Dureté :55-65 HB

Application :Emergency bearing, contaminated lube conditions

Notes :Maximum embeddability, boundary lubrication

Babbitt-Lined Bronze

Dureté :20-30 HB (babbitt)

Application :OEM replacement where babbitt specified

Notes :Conformable surface, sacrificial wear layer

Note: Bushing material should match OEM specification. Contact ATF with crusher model for correct alloy selection.

Eccentric

Eccentric Assemblies: The Heart of Gyratory Motion

The eccentric assembly is the precision mechanism that creates the characteristic gyratory crushing motion of cone crushers, converting rotational input from the drive pinion into the eccentric orbit of the main shaft and mantle that produces the compression-release crushing cycle. The eccentric throw (the offset distance between the main shaft centerline and the eccentric bore centerline, typically ranging from 10-40 mm depending on crusher model) directly determines the crushing stroke, throughput capacity, and reduction ratio of the machine. The assembly operates at rotational speeds of 200-400 RPM while supporting the full weight and crushing forces of the main shaft, mantle, and material load—total bearing loads that can exceed 200-500 kN in large machines. Eccentric housings are manufactured from cast or ductile iron with precision-machined bores, and the critical bearing surfaces are provided by centrifugally cast bronze bushings conforming to ASTM B505 or babbitt liners per ASTM B23.

Eccentric assemblies rely on precision bronze bushings that support the main shaft while allowing smooth rotation with minimal friction and wear. These bushings operate under hydrodynamic lubrication conditions where a thin oil film (typically 0.05-0.15 mm minimum thickness) separates the shaft surface from the bushing surface, preventing metal-to-metal contact. Maintaining this oil film requires correct radial clearance (typically 0.15-0.40 mm depending on shaft diameter and model), adequate oil flow, proper oil viscosity matched to operating temperature (normal sump temperature range 40-65 degrees Celsius), and clean oil free from abrasive contaminants. Worn bushings cause increased clearances that reduce oil film pressure and allow shaft wobble, generating vibration that accelerates wear throughout the crusher and ultimately leads to main shaft damage from metal-to-metal contact. ATF supplies both complete eccentric assemblies (including housing, bushings, counterweights, and gear) and individual bushing components cast from C93200 leaded tin bronze, C95400 aluminum bronze, C93700 high-lead bronze, or babbitt-lined bronze matched to the OEM specification.

Bronze Bushings

OEM Tolerances

Precision Machined

Cone crusher eccentric assembly and bushing components manufactured by ATF

Eccentric assembly controls the gyrating motion that drives compression crushing — precision bore and journal tolerances

Key Features of ATF Eccentric Components

Precision Bore Geometry

Eccentric bore machined to exact specifications for correct throw and proper bushing fit. Critical for crusher performance and bearing life.

Premium Bronze Alloys

Bushings cast from leaded bronze, aluminum bronze, or phosphor bronze alloys selected for load capacity and lubricity.

Oil Groove Patterns

Bushing oil grooves machined to OEM patterns for proper lubricant distribution. Correct groove geometry ensures adequate oil film.

Interference Fits

Bushings manufactured with correct interference for press-fit installation. Proper fit prevents spinning and ensures heat transfer.

Complete Assemblies

Complete eccentric assemblies available including housing, bushings, counterweights, and gear where applicable.

Individual Components

Individual bushings and wear components available for field replacement without complete assembly change.

Need Eccentric Components?

Send your crusher model for a quote on complete assemblies or individual bushings.

Request a Quote

OEM Compatibility

ATF manufactures eccentric assemblies and bushings for all major cone crusher brands with correct throw specifications and bushing fits.

Metso

HP Series (HP100-HP800)
GP Series (GP100-GP550)

Sandvik

CH Series (CH420-CH895)
CS Series
H-Series Hydrocone

Terex / Cedarapids

TC Series
Kodiak Series

Telsmith

T-Series (T200-T900)
H-Series

Symons

Standard (2'-7')
Shorthead (2'-7')

FLSmidth

Raptor Series

FAQ

Eccentric FAQ

Trouvez les réponses aux questions courantes sur eccentric les matériaux, la sélection, la maintenance et les commandes. Vous ne trouvez pas ce que vous cherchez ?

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What causes eccentric bushing failure?

Eccentric bushing failure in cone crushers is predominantly caused by lubrication system deficiencies that disrupt the critical hydrodynamic oil film separating the shaft and bushing surfaces. Insufficient lubrication from low oil level, clogged filters, pump wear, or blocked oil passages starves the bearing of the oil flow needed to maintain film thickness. Using incorrect oil viscosity—too thin at operating temperature fails to generate adequate film pressure, too thick impedes oil flow into the clearance gap—creates conditions for boundary contact. Contaminated oil containing water (from seal leaks or condensation), dust (from worn dust seals), or metal particles (from other worn components) creates an abrasive slurry that accelerates wear and scores the bearing surfaces. Overloading the crusher beyond design capacity increases bearing loads beyond the oil film support capacity. Operating temperatures above 65-70 degrees Celsius in the oil sump reduce oil viscosity below the minimum required for hydrodynamic lubrication. Regular oil analysis at 250-500 hour intervals monitoring viscosity, water content, particle count, and spectrometric metals (copper, tin, lead for bronze wear) provides early warning of developing bushing problems before catastrophic failure occurs.

How do I know if eccentric bushings are worn?

Several operational indicators signal eccentric bushing wear that warrants inspection and potential replacement. Increased vibration measured at the eccentric housing or main frame indicates enlarged clearances allowing shaft orbital irregularities. Unusual noise from the eccentric area—metallic knocking or grinding during rotation—suggests intermittent metal-to-metal contact between the shaft and bushing. Elevated oil return temperature beyond the normal 40-65 degree Celsius range indicates increased friction from worn bearing surfaces. Oil analysis is the most reliable predictive indicator: elevated copper (Cu), tin (Sn), and lead (Pb) concentrations in spectrometric oil analysis directly correlate with bronze bushing wear rate. A sudden increase in these metals indicates accelerating wear. Visible main shaft wobble at the mantle during operation (observed from a safe distance) confirms that radial clearances have exceeded acceptable limits. Direct measurement of shaft-to-bushing clearance using feeler gauges during a maintenance stop provides definitive data. Compare measured clearances against the OEM specification, which typically ranges from 0.15-0.40 mm for new bushings depending on shaft diameter.

Can worn bushings be rebabbitted?

Babbitt-lined bushings (conforming to ASTM B23 Grade 2 or Grade 3) can often be successfully rebabbitted if the bronze or steel backing shell is in good condition with no cracks, scoring, or dimensional deviation beyond tolerance. The rebabbitting process involves melting and removing the worn babbitt layer, inspecting and preparing the backing surface (including tinning to ensure metallurgical bond), centrifugally casting new babbitt metal to the correct thickness, and final boring to the required diameter and surface finish. This process requires specialized centrifugal casting equipment and experienced operators to achieve proper bond integrity and dimensional accuracy. Ultrasonic bond testing should be performed after rebabbitting to verify adhesion between the babbitt and backing. For solid bronze bushings (C93200, C95400, or C93700 per ASTM B505), rebabbitting is not applicable and replacement with new bushings is the standard approach. New bronze bushings are centrifugally cast for optimal microstructure density at the bearing surface and machined to OEM bore dimensions with oil grooves cut to the specified pattern. ATF can assess rebabbitting feasibility based on photographs and measurements of the existing bushing condition.

What clearances should eccentric bushings have?

Bushing clearances are precisely specified by the OEM for each crusher model and must be verified against these specifications, not assumed from general guidelines. Typical radial clearances (measured as the gap between the shaft OD and bushing ID) range from 0.15-0.40 mm for new installations depending on shaft diameter, with larger shafts requiring proportionally larger clearances to accommodate thermal expansion and maintain adequate oil film geometry. As a general reference, most OEMs specify approximately 0.001 mm per mm of shaft diameter as the nominal radial clearance (for example, 0.20 mm for a 200 mm diameter shaft), but this varies with lubrication system design and oil viscosity. Too little clearance restricts oil flow into the bearing, generates excessive heat from fluid shear, and can cause seizure during thermal expansion if the shaft diameter grows faster than the bushing bore. Too much clearance reduces hydrodynamic oil film pressure, allows shaft wobble that generates vibration, and accelerates wear. Measure clearances using calibrated internal micrometers or bore gauges for the bushing and external micrometers for the shaft. Always compare measurements to the specific OEM tolerance range for your model.

Contenu technique révisé par l'équipe d'ingénierie ATF | Spécifications métallurgiques vérifiées selon les normes ASTM/ISO

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