Understanding the 650mm Conveyor Belt
A 650mm conveyor belt is a standard-width belt (designated B650 in many catalogs) used in bulk material handling systems across mining, coal preparation, cement plants, power stations, and sand and gravel yards. Its 650 mm width offers a practical balance between carrying capacity and structural economy, making it a common choice for medium-duty conveyor lines. This article refers specifically to the 650mm belt; other widths such as B800 or B1000 are mentioned only for comparison where relevant.
Construction and Material Options
The belt body typically consists of a carcass and rubber covers. Common carcass types include EP (polyester-cotton) and NN nylon fabric, with 2 to 6 plies depending on the required strength. Steel cord construction is also available for higher tensions. Cover grades are selected to suit the environment: abrasion-resistant for sand and gravel, heat-resistant for cement clinker or foundry service, oil-resistant for certain industrial streams, and flame-retardant plus antistatic for coal mines and other hazardous areas.
Surface forms can be smooth, patterned (such as herringbone or chevron), or with corrugated sidewalls for inclined transport. These variations allow the same 650mm width to serve different slope angles and material characteristics.
Common Specifications
The following table lists typical reference values. Actual supply should be confirmed with the manufacturer based on the application.
| Parameter | Common Options / Range |
|---|---|
| Belt width | 650 mm (B650) |
| Fabric types | EP, NN |
| Tensile strength grades | EP200, EP315, EP400, EP500, EP630, EP800, EP1000 |
| Number of plies | 2 to 6 |
| Cover thickness (top + bottom) | 3+1.5 mm, 4+2 mm, 5+2 mm, 6+2 mm, 8+3 mm |
| Special properties | wear-resistant, heat-resistant, oil-resistant, flame-retardant, antistatic, cold-resistant, acid and alkali resistant |
Where a 650mm Belt Fits
This width is frequently found on medium-capacity conveyors in:
- Coal mines and preparation plants, where flame-retardant and antistatic grades are often required.
- Mines and quarries handling crushed stone, ore, or overburden.
- Cement plants transporting clinker, limestone, or additives.
- Power stations feeding coal or biomass.
- Sand and gravel yards moving washed or dry aggregate.
It can also appear in package handling or recycling lines, though heavier-duty widths may be chosen for very high tonnages.
Matching Components
A 650mm belt does not dictate a single pulley or idler size. Drive pulleys, tail pulleys, and bend pulleys are selected based on belt tension, shaft load, and available space — they are not interchangeable terms. Idler rollers for the carrying and return sides should match the belt width and load, while conveyor brackets and frames must suit the installation. A common mistake is to assume a fixed shaft diameter from belt width alone; the drive pulley diameter and shaft are determined by engineering calculations, not by the belt width in isolation.
Buyer Checklist
- Confirm material type, lump size, and bulk density to estimate required belt strength and cover grade.
- Check ambient and material temperature; choose heat-resistant or cold-resistant compounds when needed.
- For underground coal or explosive dust areas, specify flame-retardant and antistatic properties.
- Review pulley and idler specifications with the conveyor designer rather than assuming a standard match.
- Consider impact, abrasion, and oil exposure — these influence cover thickness and compound selection.
- Ask for the manufacturer’s data sheet; values in this article are typical references, not universal guarantees.
Whether the application is a coal mine, a cement plant, or a sand and gravel yard, the 650mm conveyor belt remains a versatile and widely supported size. Proper selection of carcass, cover, and surface form will extend service life and keep the system running efficiently.
