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BS 8438:2004+A1:2010

$198.66

Troughed belt conveyors. Specification

Published By Publication Date Number of Pages
BSI 2010 64
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This British Standard specifies the mechanical design, dimensional requirements and methods for calculating the operating power requirements for non-mobile troughed belt conveyors incorporating carrying idlers. The standard also specifies methods for calculating the forces exerted on the belt.

This standard applies to conveyors using either rubber or plastic belting, with textile reinforcement (conforming to BS 490-1), carrying loose bulk materials, having a maximum speed of 6 m/s.

This standard does not cover the safeguarding of hazard points. BS EN 620:2002 covers the safeguarding of hazard points on fixed troughed belt conveyors and BS EN 618:2002 deals with safeguarding of hazard points on fixed belt conveyors that are built into or attached to machines.

This standard does not apply to the following categories:

  1. underground mining conveyors;

  2. conveyors handling materials that do not behave as bulk solids.

NOTE 1 Annex A provides guidance on the information to be supplied by the purchaser at the time of enquiry and/order.

NOTE 2 Portable and mobile conveyors are covered in BS 4531.

NOTE 3 Belt speed in excess of 6 m/s might require analysis of forces not considered in this specification.

PDF Catalog

PDF Pages PDF Title
1 BRITISH STANDARD
2 Committees responsible for this British�Standard
3 Contents
7 1 Scope
2 Normative references
3 Terms and definitions
head of the conveyor
carrying idler
return idler
take-up device
8 driving pulley
snub pulley
bend pulley
tail pulley
take-up pulley
delivery pulley
drive
power unit
transmission
safeguard
regenerative conveyor
cleaner
overend discharge
tripper
shuttle conveyor
9 plough
edge idlers
sized material
Typical troughed belt conveyor
10 4 Belting
4.1 Belt width
Belt width and belt edge clearance
4.2 Belt capacity and speed
11 Factor
Maximum lump size for given belt width
4.3 Belt edge clearance
12 Belt edge clearance
13 5 Pulleys
5.1 Minimum pulley face length
Minimum pulley face length
5.2 Pulley nominal diameter
14 5.3 Profile
5.4 Minimum pulley diameter appropriate to nominal belt carcass thickness
15 Minimum pulley diameter appropriate to belt construction
16 6 Idlers and idler sets
6.1 General
Angle of inclination of the wing idlers for troughed carrying idler sets
6.2 Materials
6.3 Nominal outside diameters of idlers
Minimum radial clearance for carrying and return idlers
17 6.4 Nominal idler lengths
Nominal lengths of carrying and return idlers appropriate to belt width
Nominal idler lengths for three-idler carrying sets, flat and vee return idlers
18 6.5 Arrangement of carrying idler sets
Plan views of in-line and staggered idler sets
Part view of in-line idler set
19 Part view of staggered idler set
20 Side elevation of wing idler with forward tilt
Clearance between carrying idlers and supporting structure
21 6.6 Arrangement of return idler sets
Single flat return idler
Two return idlers in vee form
22 Plan view of vee return roller set
23 Clearance between return idler and supporting structure
6.7 Mounting dimensions
Mounting dimensions of carrying and return idlers sets in common usage appropriate to belt width
24 Mounting dimensions of carrying and return idler sets
6.8 Design load
6.9 Idler bearings
25 6.10 Belt speed and eccentricity appropriate to nominal idler outside diameter
Nominal outside idler diameters and related belt speeds
6.11 Pitch of idler sets
26 Typical pitch of idler sets with troughing angle up to 35°
6.12 Impact rings and discs
Impact ring for carrying idlers outside diameter
27 Impact ring dimensions
Discs for return idlers outside diameter
Disc dimensions
28 Recommended spacing requirements for discs on return idlers
Recommended spacing requirements for disc type return idlers
29 7 Transition distances
8 Take-up devices
9 Driving force
9.1 Belt conveyor motion resistances
30 9.2 Peripheral force (
33 Coefficient
34 Basic selection of friction factor
35 Adjustment factor
Adjustment factor
36 Rules for calculating the secondary resistance
37 Rules for calculating the special resistances
39 Tensile forces exerted on the belt
Friction coefficient factor, », between driving pulleys and rubber belting
Drive factor
41 10 Power requirements
42 (informative) Information to be supplied by the purchaser
(informative) Information to be supplied by the purchaser
43 (informative) Illustrations of basic conveyor equipment
(informative) Illustrations of basic conveyor equipment
44 Typical forms of drives
45 Typical forms of take-up device
46 Typical travelling tripper
47 Typical arrangement of troughed belt shuttle conveyor
48 Typical plough
49 (normative) Capacity and cross-section of a conveyor with a smooth patternless belt
(normative) Capacity and cross-section of a conveyor with a smooth patternless belt
50 Maximum cross-section of the handled material,
51 Trough section with three carrying idlers
Trough section with two carrying idlers
Trough section with one carrying idler
52 Maximum cross-section,
(informative) Typical values of rotating masses for carrying and return rollers and conveyor belt…
(informative) Typical values of rotating masses for carrying and return rollers and conveyor belt…
53 Typical value of revolving mass of carrying and return idlers (kg/m)
54 Typical conveyor belt mass
(informative) Example of belt conveyor calculation with conveyor length in excess of 80 m
(informative) Example of belt conveyor calculation with conveyor length in excess of 80 m
Longitudinal section of a conveyor
60 (informative) Typical example of belt conveyor calculation with conveyor length less than�80�m
(informative) Typical example of belt conveyor calculation with conveyor length less than�80�m
62 Tabulation of belt forces (N)
BS 8438:2004+A1:2010
$198.66