BS 8438:2004+A1:2010
$198.66
Troughed belt conveyors. Specification
Published By | Publication Date | Number of Pages |
BSI | 2010 | 64 |
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:
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underground mining conveyors;
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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) |