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Coal Belt Conveyor Mining Rubber Roller
**Product Specifications:**
- **Model Number:** SH-I
- **Working Life:** 1 Year Under Normal Working Conditions
- **Seal Type:** Non-Contact Labyrinth Seal Structure
- **Testing:** Water-Proof and Dust-Proof
- **Shaft Material:** 45# Cold Drawn Round Steel
- **Belt Width:** B500~B2400
- **Welding Method:** Mixed Gas Shielded Arc Welding End
- **Executive Standards:** GB, ISO, CEMA, DIN, JIS, etc.
- **Length Range:** 150–3500mm
- **Color:** As Per Customer Requirements
- **Trademark:** SH
- **Transport Packaging:** Plywood Case
- **Specification:** 60–219
- **Origin:** China
- **HS Code:** 84313900
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### **Roller Structure**
The roller is composed of several key components including the shaft, shell, housing, inner seal, bearing, labyrinth seal, cover, protective cover, and circlip. This design ensures durability and smooth operation under various working conditions.
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### **Technical Requirements for Materials**
1. **Steel Tube:**
- Made from carbon steel.
- The surface must be smooth without cracks, folds, layers, or lap welding.
- Ovality should be less than half of the outer diameter tolerance.
- Curvature should not exceed 1.0 mm/m.
2. **Bearings:**
- Rollers use C3 deep groove radial ball bearings with a bidirectional sealing structure to enhance water and dust resistance.
- Brands include SKF, NSK, NTN, HRB, KOYO, IKO, THK, TIMKEN, etc., ensuring high-quality performance.
3. **Seal:**
- A non-contact seal is used where moving parts do not touch, creating a proper clearance seal.
- Advantages:
- Minimal friction heat generation.
- No wear and tear, ideal for high-speed and high-temperature environments.
- Complex, winding maze between inner and outer seal parts.
- Excellent waterproof and dustproof performance.
4. **Lubrication:**
- Lubricating oil is used to reduce internal friction and wear, prevent seizing, and extend the bearing's life.
- Benefits include:
- Reduced friction and wear.
- Extended fatigue life.
- Heat dissipation and cooling.
- Protection against foreign particles and corrosion.
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### **Production Technical Requirements**
- **Cutting Tolerance:**
The cutting size and tube length are processed according to IT tolerance level.
| Size (mm) | Tolerance (mm) |
|-----------|----------------|
| 250–315 | 0.32 |
| 315–400 | 0.36 |
| 400–500 | 0.40 |
| 500–630 | 0.44 |
| 630–800 | 0.50 |
| 800–1000 | 0.56 |
| 1000–1250 | 0.66 |
| 1250–1600 | 0.78 |
- **Bevel Roughness:**
Bevel roughness is checked according to Ra max value of 12.5–6.3 μm. The bevel size on both ends should be the same without burrs. Cut surfaces must be parallel, with IT10 tolerance.
- **Tolerance for Bearing Housing Installation:**
Diameter tolerance for bearing housing installation follows H9 standard.
| Size (mm) | Tolerance (mm) |
|-----------|----------------|
| 50–80 | 0–0.074 |
| 80–120 | 0–0.087 |
| 120–180 | 0–0.10 |
| 180–250 | 0–0.115 |
- **Processing Tolerance:**
Depth tolerance on one end of the bearing housing stop is 0–0.2 mm. The space distance tolerance of the bearing housing stop should also be within 0–0.2 mm. The processing part of the tube should have a roughness of 6.3–3.2 μm (Ra max), without any burrs.
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### **Roller Specifications**
| No. | Standard Diameter (mm) | Inch | Length Scope (mm) | Bearings Type (Min~Max) | Idler Shell Wall Thickness |
|-----|------------------------|------|-------------------|--------------------------|----------------------------|
| 1 | 63.5 | 2 1/2 | 150–3500 | 203, 204 | 3.0–4.0 mm |
| 2 | 76 | 3 | – | 204 | 3.0–4.5 mm |
| 3 | 89 | 3 1/3 | – | 204, 205 | 3.0–4.5 mm |
| 4 | 102 | 4 | – | 204, 205, 206, 305 | 3.2–4.5 mm |
| 5 | 108 | 4 1/4 | – | 204, 205, 206, 305, 306 | 3.5–4.5 mm |
| 6 | 114 | 4 1/2 | – | 204, 205, 206, 305, 306 | 3.5–4.5 mm |
| 7 | 127 | 5 | – | 204, 205, 206, 305, 306 | 3.5–5.0 mm |
| 8 | 133 | 5 1/4 | – | 204, 205, 206, 207, 305, 306 | 3.5–5.0 mm |
| 9 | 140 | 5 1/2 | – | 205, 206, 207, 305, 306, 307 | 3.5–5.0 mm |
| 10 | 152 | 6 | – | 205, 206, 207, 305, 306, 307, 308 | 4.0–5.0 mm |
| 11 | 159 | 6 1/4 | – | 205, 206, 207, 305, 306, 307, 308 | 4.0–5.0 mm |
| 12 | 165 | 6 1/2 | – | 206, 207, 305, 306, 307, 308 | 4.5–6.0 mm |
| 13 | 177.8 | 7 | – | 207, 306, 307, 308, 309 | 4.5–6.0 mm |
| 14 | 190.7 | 7 1/2 | – | 207, 306, 307, 308, 309, 310 | 4.5–7.0 mm |
| 15 | 194 | 7 5/8 | – | 207, 306, 307, 308, 309, 310 | 4.5–8.0 mm |
| 16 | 219 | 8 5/8 | – | 308, 309, 310, 312 | 4.5–8.0 mm |
This detailed specification ensures that the roller meets high standards of quality, reliability, and performance in industrial applications such as coal belt conveyors and mining equipment.