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Coal Belt Conveyor Mining Rubber Roller
**Product Specifications**
- **Model No.:** SH-I
- **Working Life:** 1 Year Under Normal Working Conditions
- **Seal Type:** Non-Contact Labyrinth Seal Structure
- **Testing:** Waterproof and Dust-Proof
- **Shaft Material:** 45# Cold Drawn Round Steel
- **Belt Width:** B500~B2400
- **Welding Process:** Mixed Gas Shielded Arc Welding
- **Executive Standards:** GB, ISO, CEMA, DIN, JIS, etc.
- **Length Range:** 150–3500 mm
- **Color:** As Per Requirement
- **Trademark:** SH
- **Transport Packaging:** Plywood Case
- **Specification:** 60–219
- **Origin:** China
- **HS Code:** 84313900
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### **Structure of the Roller**
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 efficiency in operation.
### **Technical Requirements on Materials**
1. **Steel Tube:**
- Made from carbon steel.
- Surface should 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. **Bearing:**
- Uses C3 deep groove radial ball bearings with a bidirectional sealing structure to enhance waterproof and dustproof performance.
- Brands available: SKF, NSK, NTN, HRB, KOYO, IKO, THK, TIMKEN, etc.
3. **Seal:**
- Non-contact seal where moving parts do not touch, maintaining proper clearance.
- Advantages:
- Minimal friction heat generation.
- No wear, ideal for high-speed and high-temperature environments.
- Complex, winding, and narrow maze between inner and outer seal parts.
- Excellent waterproof and dustproof performance.
4. **Lubricating Oil:**
- Purpose: Reduce internal friction and wear, prevent seizing.
- Benefits:
- Reduces friction and wear.
- Extends fatigue life.
- Discharges friction heat and provides cooling.
- Prevents foreign matter entry and rust/corrosion.
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### **Technical Requirements on Production**
- **Tube Cutting Size and Length:** Follow IT tolerance level.
- **Tolerance for Cut Size (IT 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:** Checked according to Ra max value (12.5–6.3 μm).
- **Cut Surface Parallelism:** Checked on IT10 tolerance.
- **Tolerance for Bevel Size:**
| Size (mm) | Tolerance (mm) |
|-----------|----------------|
| 63–100 | 0.15 |
| 100–160 | 0.20 |
| 160–250 | 0.25 |
- **Bearing Housing Diameter Tolerance (H9):**
| Size (mm) | Tolerance (mm) |
|-----------|----------------|
| 50–80 | 0–0.074 |
| 80–120 | 0–0.087 |
| 120–180 | 0–0.10 |
| 180–250 | 0–0.115 |
- **Depth Tolerance for Bearing Housing Stop:** 0–0.2 mm.
- **Roughness of Processing Part:** 6.3–3.2 μm (max Ra), no burr.
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### **Roller Specification Table**
| NO. | Standard Diameter (mm) | Inch | Length Scope (mm) | Bearings Type (Min~Max) | Idler's 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 comprehensive specification sheet outlines all necessary details about the product, ensuring quality and compliance with international standards.