Customization: | Available |
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Warranty: | 1 Year |
Certification: | ISO 9001:2000 |
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Blow bars are critical wear-resistant components in impact crushers, designed to crush materials such as limestone, concrete, asphalt, and recycled construction debris. Positioned on the rotor of an impact crusher, they strike incoming materials at high velocity, breaking them into smaller, uniform sizes. These components are engineered to withstand extreme abrasion, impact, and heat generated during crushing operations.
Key Features:
Blow bars are widely used in mining, quarrying, recycling, and construction industries, ensuring reliable performance in harsh operating conditions.
Parameter Category | Parameter Item | Technical Specifications/Range | Application Scenarios & Features | Notes/Data Sources |
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Material Composition | High Chrome Steel (Cr23-Cr27) | Chromium content 23%-27%, hardness 58-62 HRC | High-wear materials (e.g., granite, quartzite) for primary/secondary crushing; asphalt/concrete recycling. | High wear resistance but low toughness; avoid metal impurities. |
Martensitic Steel | Hardness 44-57 HRC, impact strength 100-300 J/cm² | Mixed materials (e.g., concrete with rebar); balances impact resistance and wear resistance for medium-wear scenarios. | Optimizes hardness-toughness balance; avoid extreme impact loads. | |
Ceramic Composite Material | Ceramic layer hardness ≥60 HRC, steel substrate for toughness | Extreme wear environments (e.g., high-silica materials, hard rock); lifespan 3-5× longer than martensitic steel. | Combines ceramic wear resistance with steel impact resistance. | |
Dimensions & Weight | Length | 300-2,000 mm (customizable) | Compatible with crusher rotors (e.g., NP series, Kleemann MR series). | Adjust based on crusher model and feed size. |
Weight | 10-500 kg | Varies by material density (High Chrome > Martensitic > Ceramic Composite). | Affects rotor balance; requires symmetrical installation. | |
Hardness & Toughness | Initial Hardness (HRC) | High Chrome: 58-62; Martensitic: 44-57; Manganese Steel: 20 (hardens up to 50) | Hardness determines wear resistance; toughness determines impact resistance; balance based on material properties. | Manganese steel achieves surface hardness via work hardening; ideal for large blocks. |
Compatibility | Supported Brands | Kleemann, Hazemag, Terex, Eagle, and custom designs | Provide rotor drawings or OEM part numbers for precise fit. | Hybrid designs available (e.g., ceramic-edged + steel body). |
Lifespan | Operational Hours | 100-1,000 hours (varies with material hardness, feed size, and crushing stage). | Shorter lifespan in primary crushing (high impact); longer lifespan in secondary crushing (steady wear). | Ceramic composite blow bars can exceed 3,000 hours. |
Certifications & Testing | Quality Certifications | ISO 9001:2015, CE, ASTM, MSHA | Ensures standardized production and material/mechanical compliance. | Third-party lab tests for hardness, microstructure, and impact strength. |
Maintenance & Replacement | Wear Limit | Minimum height ≥15-18 mm (measured from the back) | Below this limit risks rotor damage or efficiency loss. | Rotate blow bars symmetrically to avoid uneven wear. |
Rotor Balance Requirements | Mass difference ≤2% between symmetrical blow bars | Imbalance causes bearing damage or structural vibration. | Pre-installation weighing and torque wrench tightening (200-400 N·m). |
Our blow bars meet stringent international quality and safety standards:
Third-party lab testing ensures hardness, impact resistance, and microstructure integrity.
1. Packaging
2. Shipping Options
All shipments include waterproof documentation (invoice, material certificates, and installation guide).
Step 1: Pre-Installation Checks
Step 2: Rotor Preparation
Step 3: Mounting Blow Bars
Step 4: Post-Installation Testing
Safety Note: Always shut off power and lock out the crusher during installation.
1. Superior Quality
2. Customization Expertise
3. Rapid Production & Delivery
4. Global Support Network
5. Cost Efficiency
1. Warranty
2. Technical Support
3. Training
Q1: How do I choose the right blow bar material? A: Match material hardness to your application:
Q2: Can blow bars be reconditioned? A: Yes, lightly worn bars can be rebuilt via hardfacing or welding. We offer refurbishment services.
Q3: How often should blow bars be replaced? A: Monitor thickness and weight loss. Replace when wear exceeds 30% of the original dimensions.
Q4: Do you provide CAD drawings for custom orders? A: Yes, we share 3D models for client approval before production.
Q5: What causes premature blow bar failure? A: Common causes include improper installation, mismatched material grade, or feeding oversized/uncrushable objects (e.g., metal).