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Anyone who has worked a site knows belt conveyor selection comes back to bite you if you cut corners up front. Undersize the belt and you get spillage and plugging. Under-rate the belt strength and it snaps after a few months. Pick the wrong idler diameter and the drive motor works harder than it should. I have seen projects where the equipment arrived and only then did someone realize the incline angle was off or the cleaners were missing. The rework cost more than the hardware.
This guide does not pile on theory. It follows one selection chain: know your material, then calculate capacity and width, then pin down belt, idlers, pulleys, cleaners, and finally estimate drive power. Walk through it once and your spec is mostly settled.
Every parameter downstream starts with the material. Get the real numbers, not a guess:
| Parameter | Why it matters | How to get it |
|---|---|---|
| Lump size (max / mean) | Sets the belt width floor and feed method | Screen a sample, take the max lump |
| Bulk density ρ (t/m³) | Goes straight into the capacity formula | Measure, or use a material handbook |
| Moisture, stickiness | Drives cleaner and idler choice | Check duty; sticky material needs stronger cleaning |
| Temperature | Decides belt compound (heat resistant or not) | Actual material and ambient temperature |
| Abrasiveness | Sets belt strength and idler wall margin | Look at hardness; ores need extra margin |
I suggest putting these on one sheet and sending it to suppliers. A lot of back-and-forth comes down to incomplete material data.
Capacity Q (t/h) is the backbone of the whole line. The formula:
A is the load cross-section on the belt (m²), v is belt speed (m/s), ρ is bulk density (t/m³), and C is the incline factor (closer to 1 when the line is flatter).
Belt width is not a guess; lump size sets the floor:
Unscreened material: max lump no more than 1/4 of belt width
Screened material: up to 2/5 of belt width
Rule of thumb when unsure: belt width at least 3× the max lump
Don't push belt speed either. Powders and sticky material run steady at 1.0–1.6 m/s. Ores sit at 1.6–2.5 m/s. Finished, light material can go above 3.15 m/s. Higher speed means more dust and spillage, and the site gets messy fast.
Wrong belt body means trouble downstream. Choose the type first:
General abrasion-resistant belt: most dry bulk, ores
Heat / high-temperature belt: cement, coking, hot material
Flame-retardant belt: underground, power plants where fire rules apply
Steel cord belt (ST series) with rip protection: long distance, high capacity, high strength
Strength is the ST rating, unit N/mm, from ST500 up to ST5400. The table below is an experience-based starting point; the final call is a design check:
| Belt width B (mm) | Recommended ST (initial) | Typical use |
|---|---|---|
| 650–800 | ST500–ST1000 | Short distance, small capacity |
| 1000–1200 | ST1000–ST1600 | General main line |
| 1400–1600 | ST1600–ST2500 | High capacity, medium-long distance |
| 1800–2400 | ST2500–ST5400 | Long distance, mine main incline |
Steel cord belts run a safety factor of about 7–9×, depending on standard and duty. Don't shave the safety factor to save a bit of width. One belt failure costs more than several belts.
Idlers look small but they are the highest-failure part of the line. Set the trough angle first, usually 35°, which gives good trough depth without overstressing the edge rubber. Diameter follows belt width:
| Belt width B (mm) | Idler diameter (mm) | Note |
|---|---|---|
| 500–650 | 89 | Light load, short distance |
| 800–1000 | 108 | General |
| 1200–1400 | 133 | Mainstream |
| 1600 and up | 159 | High capacity, steel cord |
Carry idler spacing is 1.0–1.5 m, return idler 2.5–3.0 m. At the feed point, tighten to 0.3–0.5 m with impact idlers, or the drop impact will damage the belt. Training idlers every 10–15 sets correct misalignment; don't wait until it drifts.
Drive pulley diameter is not random; it ties to belt strength. Steel cord belts are sensitive to bending fatigue, and a small diameter wears the belt quickly. As a rule, drive pulley diameter grows with width: B≤800 takes 500, B=1000–1200 takes 630–800, B≥1400 takes 1000–1250, and steel cord needs more.
Don't skip lagging. An unlagged pulley loses friction fast in wet material, and that leads to slip and burnt motors. The head drive pulley takes diamond or ceramic lagging; the tail bend pulley is fine with plain rubber lagging.
I have seen lines where everything else was speced well, only the cleaners were left out. Then the return belt carries material back, spilling all the way, and someone sweeps under the gallery every day. Put an alloy or polyurethane cleaner on the head pulley to clean the carry side, and a return-side cleaner on the empty run. With those two, return carryback drops by half or more. Sticky material may need a second stage or water wash.
Don't guess motor power. A quick formula:
Q is capacity (t/h), L is horizontal length (m), H is lift (m, positive up, negative down), ω is the resistance coefficient (0.02–0.04; heavier or stickier material takes the higher end). After shaft power, divide by total efficiency η (about 0.85–0.90) for motor power.
Example: a mine incline, Q = 1200 t/h, L = 800 m, H = 120 m, ω = 0.03.
Real systems need drive, backstop, brake, and margin, with the final figure from design software. The point of this formula is to give you a number before talks, so a power rating thrown out in a meeting doesn't steer you wrong.
An open-pit mine needed to move ore from the pit to the crusher: 1.2 km horizontal, 80 m lift, 2000 t/h, max lump 350 mm. Following the chain: width at least 1050 mm, so 1200 mm; ST2000; idler 133 mm, trough 35°; drive pulley 1000 mm with ceramic lagging; head and tail cleaners; power estimate around 700 kW, ending in a dual drive. The line has run over a year with no belt failure and no serious misalignment. The win wasn't expensive hardware. Every step followed the data, and none were skipped.
Selection is one chain: material → capacity → belt → idlers → pulleys → cleaners → drive. Skip a step on a hunch and the site will collect the bill.
If you have material data and conveyor distance, we can run the initial selection with you. We also provide a fillable Belt Conveyor Selection Data Sheet that lists every field to collect in one place. Leave a message or contact us and we will send it over.
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