Belt Conveyor Industrial Steel Roller for Coal or Mining

Model NO.: SH-T
Working Life: 1 Year Under Normal Working Conditions
Seal Type: Non-Contact Labyrinth Seal Structure
Testing: Water-Proof and Dust-Proof
Shaft: 45# Cold Drawn Round Steel
Belt Width: B500~B2400
Welding: Mixed Gas Shielded Arc Welding End
Executive Standard: GB, ISO, CEMA, DIN, JIS, etc.
Length: 150-3500mm
Color: As Per Requirement
Trademark: SH
Transport Package: Plywood Case
Specification: 60-219
Origin: China
HS Code: 84313900

Structure of the Roller
Roller is assembled with shaft, shell, housing, inner seal, bearing, labyrinth seal, cover, protective cover, and circlip.

Belt Conveyor Industrial Steel Roller for Coal or Mining
Technical Requirements on the Material
1)Steel Tube:
*Carbon steel
*Surface of steel tube should be smooth
*No cracks, folds, laminations, or lap welding defects
*Ovality should be less than 1/2 of the outer diameter tolerance
*Curvature should be less than 1.0mm/m

Outer D
mm		 Thickness S
mm		 Theoretical WT
kg/m		 Allowable deviation mm
Outer diameter Wall thickness Wall thickness difference
Normal High level Normal High level
63.5 3.2 4.76 ±0.50 ±0.30 ±0.32 ±0.24 ≤7.5%
4.5 6.55 ±0.45 ±0.34
76.0 3.2 5.74 ±0.50 ±0.30 ±0.32 ±0.24
4.5 7.93 ±0.45 ±0.34
89.0 3.2 6.77 ±0.60 ±0.40 ±0.32 ±0.24
4.5 9.38 ±0.45 ±0.34
108.0 3.2 8.27 ±0.70 ±0.40 ±0.32 ±0.24
4.5 11.49 ±0.45 ±0.34
133.0 4.5 14.26 ±0.80 ±0.60 ±0.45 ±0.34
5.0 15.78 ±0.50 ±0.38
159.0 4.5 17.14 ±0.90 ±0.60 ±0.45 ±0.34
5.0 18.99 ±0.50 ±0.38
6.0 22.64 ±0.60 ±0.45
194.0 5.0 23.30 ±1.0 ±0.80 ±0.50 ±0.38
6.0 27.32 ±0.60 ±0.45
219.0 5.0 26.39 ±1.1 ±0.80 ±0.50 ±0.38
6.0 31.52 ±0.60 ±0.45

2) Bearing
*Rollers use C3 deep groove radial ball bearings with a bidirectional sealing structure to enhance water and dust resistance.
*Brands: SKF, NSK, NTN, HRB, KOYO, IKO, THK, TIMKEN, etc.
       (Ensure high-quality bearings)

3) Seal
Non-contact seal:
This type of seal does not involve contact between moving parts, and it maintains a proper clearance for sealing.
Advantages:
*Minimal friction heat generation during operation
*No wear and tear, ideal for high-speed and high-temperature environments
*Creates a complex, winding, and narrow maze between inner and outer seal components
*Excellent water and dust protection performance

4) Lubricating Oil
The purpose of lubrication in rolling bearings is to reduce internal friction and wear, prevent seizing. The lubrication benefits include:
*Reducing friction and wear
*Extending fatigue life
*Discharging friction heat and cooling
*Preventing foreign matter from entering the bearing or rust and corrosion
ETC.


Technical Requirements on Production
Cutting size of the tube and tube length will follow IT tolerance levels.
Size(mm) 250-
315		 315-
400		 400-
500		 500-
630		 630-
800		 800-
1000		 1000-
1250		 1250-
1600
Tolerance
(mm)		 0.32 0.36 0.4 0.44 0.5 0.56 0.66 0.78

The bevel roughness of the tube cut should be checked according to the maximum Ra value (12.5–6.3μm). The bevel sizes on both ends must be equal without burrs. The cut surfaces on both ends of the tube should be parallel and checked at IT10 tolerance level. Please refer to the table below for tolerance values (based on diameter).
Size(mm) 63-100   100-160 160-250
Tolerance(mm) 0.15 0.20 0.25

Diameter tolerance for the bearing housing installation stop should conform to H9 tolerance. For detailed size requirements, please refer to the table below.
Size(mm) 50-80 80-120 120-180 180-250
Tolerance(mm) 0-0.074 0-0.087 0-0.10 0-0.115

The depth tolerance for one end of the bearing housing installation stop should be processed and checked within 0–0.2mm. The space distance tolerance for the bearing housing stop should be within 0–0.2mm. The surface roughness of the processed tube should be checked at 6.3–3.2μm (maximum Ra), with no burrs.

Roller Specification:
NO. Standard Diameter Length Scope
(mm)		 Bearings Type
Min~Max		 Idler's Shell Wall Thickness
  mm Inch      
1 63.5 2 1/2 150-3500 203 204 3.0mm~4.0 mm  
2 76 3   204 3.0mm~4.5 mm  
3 89 3 1/3   204 205 3.0mm~4.5 mm  
4 102 4   204 205 206 305 3.2mm~4.5 mm  
5 108 4 1/4   204 205 206 305 306 3.5mm~4.5 mm  
6 114 4 1/2   204 205 206 305 306 3.5mm~4.5 mm  
7 127 5   204 205 206 305 306 3.5mm~5.0 mm  
8 133 5 1/4   204 205 206 207 305 306 3.5mm~5.0 mm  
9 140 5 1/2   205 206 207 305 306 307 3.5mm~5.0 mm  
10 152 6   205 206 207 305 306 307 308 4.0mm~5.0 mm  
11 159 6 1/4   205 206 207 305 306 307 308 4.0mm~5.0 mm  
12 165 6 1/2   206 207 305 306 307 308 4.5mm~6.0 mm  
13 177.8 7   207 306 307 308 309 4.5mm~6.0 mm  
14 190.7 7 1/2   207 306 307 308 309 310 4.5mm~7.0 mm  
15 194 7 5/8   207 306 307 308 309 310 4.5mm~8.0 mm  
16 219 8 5/8   308 309 310 312 4.5mm~8.0 mm  

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