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 Required
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, in 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
*Without any fault such as crack, folding, layering or lap welding
*Ovality should be less than 1/2 of tolerance of outer diameter
*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 adopt C3 deep groove radial ball bearings with bidirectional sealing 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 prevents contact between moving parts, creating a proper clearance. Advantages include:
*Minimal friction heat during operation
*No wear, ideal for high-speed and high-temperature environments
*Complex, narrow maze formed between inner and outer seal components
*Excellent water and dust protection performance.

4) Lubricating Oil
The purpose of lubrication is to reduce internal friction and wear, prevent seizing, and improve bearing life. Benefits include:
*Reduced friction and wear
*Extended fatigue life
*Heat dissipation and cooling
*Prevention of foreign matter entering the bearing, or rust and corrosion
etc.


Technical Requirements on Production
Cutting size and tube length are manufactured to IT tolerance level.
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

Tube cutting and bevel roughness are checked according to Ra max value (12.5–6.3μm). Bevel sizes at both ends must be equal without burrs. The cut surfaces must be parallel and checked to IT10 tolerance. See 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 bearing housing installation stop must conform to H9 standard. Refer to the table below for size requirements.
Size (mm) 50-80 80-120 120-180 180-250
Tolerance (mm) 0-0.074 0-0.087 0-0.10 0-0.115

Depth tolerance for one end of the bearing housing installation stop should be processed and checked to 0-0.2mm. The spacing between stops should also be within 0-0.2mm. The surface roughness of the processed tube should be 6.3–3.2μm (Ra max), 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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