General machinery and tool spare parts
Category:
Product Introduction
I. Transmission Components
(I) Gears / Racks
1. Gearbox Gears
Technical Parameters
Material: 20CrMnTi/42CrMo, surface hardness HRC58-62 (carburizing and quenching)
Accuracy Grade: GB Grade 6 - 8, cumulative total deviation of tooth pitch ≤0.03mm (module 4mm)
Module: 2-16mm, transmission ratio range 1.5-50, rated torque 500-50000N・m
Lubrication Requirements: L-CKC 220# industrial closed gear oil, oil temperature ≤80℃
Selection Points
Rolling mill main gearbox selects hardened gear (contact fatigue strength ≥1200MPa), surface flaw detection is required (UT level ≥Ⅱ level)
Belt conveyor gearbox selects helical gear (overlap ratio ≥1.3), noise ≤85dB (1m from equipment)
2. Rolling Mill Main Drive Gear
Technical Parameters
Material: 34CrNiMo6/17CrNiMo6, core hardness HB220-260, surface hardness HRC55-60
Module: 8-20mm, gear diameter Φ500-Φ2000mm, transmission power 500-5000kW
Contact Strength: ≥1300MPa, bending strength ≥800MPa, service life ≥5 years
Cooling Method: oil jet lubrication (oil quantity 5-10L/min・m), oil temperature control 35-55℃
Selection Points
Hot rolling mill selects herringbone gear (axial force balance), hardness difference between paired gears ≥30HB
Cold rolling mill selects high-precision helical gear (GB Grade 5), surface roughness Ra≤1.6μm
3. Rack
Technical Parameters
Material: 45# steel / 40Cr, surface quenching hardness HRC45-50
Module: 4-12mm, rack length 500-3000mm, straightness ≤0.1mm/m
Meshing Accuracy: tooth pitch error ≤0.05mm, meshing clearance with gear 0.1-0.3mm
Load Capacity: line load ≤2000N/mm, applicable speed ≤2m/s
Selection Points
Large machine tools select ground racks (accuracy GB Grade 7), with gear module ≥6mm
Automated production lines select wear-resistant coated racks (hard chrome plated surface, thickness 0.02-0.05mm)
(II) Belts / Chains
1. Conveyor Belt
Technical Parameters
Material: polyester canvas (EP) / steel wire core (ST), cover rubber hardness Shore A 60-75
Width: 500-2400mm, tensile strength EP100-EP800 (N/mm), ST1000-ST5000
Temperature Resistance: ordinary conveyor belt ≤80℃, high-temperature conveyor belt ≤150℃ (silicone rubber cover layer)
Wear Resistance: wear amount ≤200mm³ (Akron test), tensile strength ≥18MPa
Selection Points
Mining material conveying selects steel wire core conveyor belt (ST2500), safety factor ≥8
Food industry selects non-toxic PVC conveyor belt (meets FDA standards), surface roughness Ra≤3.2μm
2. Transmission Chain
Technical Parameters
Type: roller chain (GB/T 1243) / sprocket chain (GB/T 10855), pitch 12.7-76.2mm
Material: 20Mn2/ 40Cr, roller hardness HRC58-62, chain plate hardness HRC40-45
Ultimate Tensile Load: 08A chain ≥13.8kN, 24A chain ≥100kN, safety factor ≥5
Corrosion Resistance: zinc-plated / nickel-plated surface, salt spray test ≥48 hours without rust
Selection Points
High-speed transmission (≥5m/s) selects sprocket chain (noise 10dB lower than roller chain)
Heavy-duty conditions select reinforced chains (chain plate thickness increased by 15-20%), such as chains used in engineering cranes
(III) Couplings
1. Diaphragm Coupling
Technical Parameters
Model: JM/JMIJ type, torque range 50-100000N・m, shaft diameter Φ20-Φ200mm
Material: diaphragm group 304/ 316 stainless steel, bolts 10.9 grade high-strength steel
Permissible Speed: Φ100mm shaft diameter ≤8000r/min, angular displacement compensation ≤1.5°, radial displacement ≤0.5mm
Fatigue Life: 10⁷ cycles without cracks, applicable temperature -20℃-+200℃
Selection Points
Fan drive selects single diaphragm coupling (light weight), rolling mill main drive selects double diaphragm coupling (strong compensation capability)
Diaphragm stress needs to be verified ≤200MPa (under rated torque)
2. Universal Coupling
Technical Parameters
Type: SWC type cross shaft, nominal torque 1000-100000N・m, shaft diameter Φ40-Φ300mm
Material: Fork 42CrMo, cross shaft 20CrMnTi, surface hardness HRC58-62
Allowable inclination angle: ≤15° (continuous operation), ≤35° (intermittent operation), transmission efficiency ≥98%
Balance grade: G16 grade, residual unbalance ≤10g・mm/kg (high-speed type selects G6.3 grade)
Selection Points
Rolling mill main drive selects SWC-BH type (standard telescopic type), compensating axial displacement ±50mm
Marine propulsion system selects high-precision universal joint (angle deviation ≤0.5°), dynamic balance test required
3. Elastic coupling
Technical Parameters
Model: TL type elastic sleeve pin coupling, torque 10-2000N・m, shaft diameter Φ16-Φ100mm
Material: Half coupling HT200/35# steel, elastic sleeve nitrile rubber (Shore hardness 60±5HA)
Allowable speed: Φ50mm shaft diameter ≤3000r/min, angular displacement compensation ≤1°, radial displacement ≤0.3mm
Service life: Elastic sleeve ≥1 year (load ≤80% rated value)
Selection Points
Water pump drive selects TL type (good shock absorption effect), motor power ≤15kW
Regularly check the elastic sleeve wear (maximum allowable wear 1mm)
II. Spare parts and service support
Selection support
Provide customized matching of equipment model (such as ZSY315 reducer), speed/torque parameters, and installation space
Gears provide 3D model adaptation, chains provide tensioning device design suggestions
Quality control
Gear with tooth shape detection report (total tooth profile deviation ≤0.02mm), chain with tensile test report
Coupling dynamic balance test (residual unbalance ≤5g・mm/kg), diaphragm fatigue life test
Inventory and delivery
Standard gear inventory ≥500 pieces, conveyor belt conventional specifications ≥1000 meters
Emergency order support priority delivery (domestic)
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Yangqu Industrial Park, Shanxi Transformation and Comprehensive Reform Demonstration Zone
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