Belt conveyor pulleys

01

Size the diameter and face width from the belt

Indian Standard IS 8531:1986 for pulleys for belt conveyors lists basic diameters of 200, 250, 315, 400, 500, 630, 800, 1,000, 1,250, 1,400 and 1,600 mm, measured at the centre excluding any lagging, with selection referred to the belting standard IS 1891. It sets the minimum belt edge clearance at 50 mm for belt widths up to 650 mm, 75 mm for 800 and 1,000 mm, and 100 mm above 1,000 mm, for belt speeds up to 3 m/s (by agreement above that), and calculates face width as belt width + 2 × edge clearance; for example 650 → 750 mm, 1,000 → 1,150 mm and 1,400 → 1,600 mm. [1]

Tongxiang's drive pulley table matches diameters to belt width, for example 630–1,000 mm diameters for 1,000 and 1,200 mm belts and 800–1,000 mm for a 1,400 mm belt, with turnaround pulleys from 250 mm; Rui Le'er lists drive pulley diameters of 250–1,250 mm and face widths of 400–2,200 mm for belts of 400–1,400 mm. [2] [3]

Editorial calculation: an 800 mm belt takes 75 mm edge clearance each side, so face width = 800 + 2 × 75 = 950 mm, matching the standard's table value. [1]

Give the supplier the belt width, type and strength, belt speed, the pulley's position (drive, head, tail, bend, snub, take-up), wrap angle and belt tensions or resultant shaft load, shaft and bearing arrangement, environment (wet, abrasive, corrosive) and lagging and crowning requirements.

02

Choose crowning, lagging, tolerances and balance

IS 8531 allows a flat or crowned face by agreement and notes: “Normally crowning is not effective for use with lagged pulley.” Crowning is 1–2 mm per 300 mm of crowned face width, symmetrical about the centre; faces wider than 1,150 mm keep the centre third straight and crown the outer thirds. Plain rubber lagging must be at least 6 mm thick on pulleys up to 500 mm diameter and 10 mm above, grooved lagging needs grooves at least 6 mm deep over at least 3 mm of material, and lagging must be softer than the belt's cover rubber. Pulleys are statically balanced, and shell thickness may not fall below 90% of the agreed value. [1]

Rui Le'er offers rubber or ceramic lagging 8–20 mm thick to raise friction and reduce slip, describing ceramic lagging for wet, muddy or high-load duty, with Q235 or Q345 shells, 45# or 42CrMo shafts, G6.3 dynamic balancing as standard (G2.5 optional), −20 °C to +80 °C operation, and tests including radial runout, dynamic balancing and ultrasonic flaw detection of shaft and welds. [3] Tongxiang lists SBR or natural rubber and vulcanised ceramic lagging with taper-compression hubs. [2]

IS 8531 designates pulleys by diameter, face width and finish, for example "Belt Pulley 400 × 600 C" for a crowned pulley and "400 × 600 R" for a rubber-lagged one, and permits fabricated pulleys from structural tube or plate with defined welding procedures. [1]

03

Compare what suppliers offer

The suppliers linked to this page list belt conveyor pulleys; their cards link to the pages reviewed.

Ask any supplier for the pulley drawing with shell and end-disc thickness, shaft diameter and material, hub or locking-assembly type, bearing and housing, lagging type and hardness, crowning, balancing grade, runout tolerance, and the calculations or test reports for shaft deflection and welds.

04

Fit crowned lagging only on pulleys whose role allows it

Flexco's data sheet for its crowned pulley lagging describes a strip divided into three equal sections along the pulley face: a flat centre and two end pieces tapered at 1:150, hot vulcanised to the centre and trimmed flush with the shell. Flexco aims it at tail and bend pulleys in low-to-medium belt tension service on belt widths of 450–1,800 mm. It states that it is not for drive or head pulleys, where it can affect tension, belt shift, product trajectory into chutes and cleaner performance, nor for pulleys running steel cord belts. The lagging is 15 mm thick in a "Natural Rubber" or fire-resistant anti-static (FRAS) compound (the specification table on the same sheet names the standard compound as "SBR (Styrene-Butadiene-Rubber)", so confirm which rubber is supplied), rated −15 °C to 85 °C and 68 ± 3 Shore A. [4]

Editorial calculation: a 1:150 taper changes thickness by 300 ÷ 150 = 2 mm over 300 mm of end piece, the same order as IS 8531's crown of 1–2 mm per 300 mm of crowned face width. IS 8531 notes: “Normally crowning is not effective for use with lagged pulley.” Ask the supplier whether the crown is machined into the shell or formed by the lagging, and confirm the pulley's role before ordering. [4] [1]

05

Trace the pulley parts

This is a functional reference built from the sources cited; it is not one maker's specification.

06

Fill the specification fields with values for your conveyor

A pulley quotation needs values for your conveyor. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

07

Send the belt, role and duty data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Belt: [width; type; strength; speed]
Pulley: [role; position; wrap angle]
Loads: [belt tensions or shaft load]
Build: [diameter; face width; shaft; hubs; bearings]
Surface: [crown; lagging type and thickness]
Environment: [wet; abrasive; temperature]

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