Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
In accordance with the requirements of Notice on Printing the Plan of Development, Revision and Relevant Works of National Engineering Construction Standards and Codes in 2017 (JIANBIAO [2016] No. 248) issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China, this standard was developed by the drafting group through extensive investigation, careful summarization of practical experience, reference to relevant international standards and foreign advanced standards and on the basis of widely soliciting for opinions.
The main technical contents of this standard are: general provisions, terms and symbols, main parameters, resistances to motion of belt conveyor, belt tensions and driving power, starting and stopping, declined belt conveyors, main components, safety protection devices, system arrangements, electrical and controls, optimal designs and dynamic performance evaluations, accessories, firefighting and environmental protection, engineering construction, engineering acceptance, etc.
The main technical contents of the revision of this standard are:
1. The engineering design of horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor, as well as the engineering construction and acceptance of belt conveyor are added to the scope in the general provisions.
2. The clause on symbols is revised to terms and symbols, and a subclause of terms is added.
3. Main parameters:
(1) The calculation of the relation between the theoretical capacity and the design capacity of the belt conveyor and the calculation method of the theoretical capacity of the 4-idler and 5-idler sets of the ordinary belt conveyor are added;
(2) The calculation method of theoretical capacity and design capacity of U-shape belt conveyor is added;
(3) The calculation method of theoretical capacity and design capacity of pipe belt conveyor and the requirements of filling coefficient of pipe belt conveyor are added;
(4) The belt speed requirements of U-shape belt conveyor and pipe belt conveyor are added;
(5) The maximum particle size requirements of U-shape belt conveyor and pipe belt conveyor are added.
4. Resistances to motion of belt conveyor:
(1) The calculation methods of total resistance to motion, major resistance, additional resistance, special resistance and lifting resistance of ordinary belt conveyor according to sections are added;
(2) Various resistance calculation methods of horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor are added;
(3) The major special resistance and additional special resistance are combined into special resistance;
(4) The calculation method of frictional resistance between material and side wall of skirt board is modified;
(5) The calculation method of additional bending resistance of convex arc section is added;
(6) The calculation method of frictional resistance between the belt and sealed apron of the skirt board.
(7) The calculation method of frictional resistance of buffer bed is added.
5. In the clause of “starting and stopping”, the checking method for materials not sliding relatively on the conveyor belt is added.
6. Belt:
(1) The selection principle of belt is revised, and the belt is incorporated into the clause of “main components”;
(2) The selection requirements of belts for belt conveyor in ground gallery and tunnel are added;
(3) The selection requirements of belts for pipe belt conveyor are added;
(4) The method of calculating the safety coefficient of conveyor belt according to the characteristics and fatigue strength of conveyor belt joints is added;
(5) The provisions on calculating joints of steel cord belts and belts of textile construction in the annex are deleted.
7. Main components:
(1) The requirements for the length of the pulley of the pipe belt conveyor are added;
(2) The arrangement and type of idler set in curve section of horizontal curve belt conveyor are added;
(3) The arrangement, type, spacing and length of idler set of U-shape belt conveyor are added;
(4) The arrangement, type, spacing and length of idler set of pipe belt conveyor are added;
(5) The requirements for the frame of the curve section of the horizontal curve belt conveyor and the frame of the pipe belt conveyor are added.
8. Safety protection devices:
(1) The mandatory provisions of safety protection devices in transmission lines are modified;
(2) The requirements for the safety protection of the pipe belt conveyor are added;
9. System arrangements:
(1) The requirements for the maximum allowable inclination angle of belt conveyor are added;
(2) The calculation method of trough transition section length of ordinary belt conveyor and horizontal curve belt conveyor is added;
(3) The arrangement of receiving section, the length of trough transition section and the minimum curvature radius of convex arc section of U-shape belt conveyor are added;
(4) The arrangement and length of receiving section and trough transition section, the arrangement and calculation method of horizontal curve section and vertical curve section of pipe belt conveyor are added;
(5) The calculation method of minimum curvature radius of convex arc section of ordinary belt conveyor and horizontal curve belt conveyor is added;
(6) The requirements for the arrangement of horizontal curve section and minimum radius of curvature of horizontal curve belt conveyor and U-shape belt conveyor are added.
10. A subclause on intelligent control is added to the clause of “electrical and control”, and electrical protection and communication are combined into one subclause.
11. The clause of “optimal design and dynamic analysis” is renamed as “optimal design and dynamic performance evaluations”, and the subclause is deleted.
12. The clause of “ancillary equipment” is renamed as “accessories”.
13. The clause of “fire protection and dust prevention” is renamed as “firefighting and environmental protection”, and a subclause of “noise and light pollution control” is added.
14. The clause of “engineering construction” is added, which contains general requirements, construction and test running.
15. The clause of “engineering acceptance” is added, which contains engineering division and engineering acceptance.
The provisions printed in bold type in this standard are compulsory and must be enforced strictly.
Technical standard for belt conveyor engineering
1 General provisions
1.0.1 This standard is developed for the purpose of unifying and standardizing the engineering design, construction and acceptance of belt conveyor, ensuring engineering quality, ensuring safe production, and achieving advanced technology and economic rationality.
1.0.2 This standard is applicable to the engineering design, construction and acceptance of ordinary belt conveyor, horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor.
This standard is not applicable to the engineering design, construction and acceptance of special belt conveyors with steel wire rope traction and air cushion, etc.
1.0.3 The bulk density of bulk materials transported by belt conveyor should be 0.50 t/m3 to 2.80 t/m3, the material temperature should not be higher than 60°C, and the operating environment temperature should be −25°C to +40°C. When the above limit is exceeded, corresponding measures shall be taken.
1.0.4 In addition to this standard, the engineering design, construction and acceptance of belt conveyor shall also meet the requirements of relevant current national standards.
2 Terms and symbols
2.1 Terms
2.1.1
ordinary belt conveyor
belt conveyor whose horizontal plane is projected as straight line
2.1.2
horizontal curve belt conveyor
belt conveyor with curved sections projected on horizontal plane
2.1.3
U-shape belt conveyor
belt conveyor which is supported by a polygonal idler set composed of several idlers, and part or all of the conveyor belts have a U-shaped cross section
2.1.4
pipe belt conveyor
belt conveyor which is supported by a polygonal idler set composed of several idlers and whose belt has a circular cross section
2.1.5
theoretical capacity
theoretical volume or mass of materials transported per unit time at the maximum permissible carrying capacity of belt conveyor
2.1.6
design capacity
volume or mass of materials transported by belt conveyor per unit time required by engineering design
2.1.7
large sized belt conveyor
belt conveyor with two or more characteristics of total driving power not less than 1,500 kW, conveying capacity not less than 3,000 t/h and length not less than 1,500m
2.1.8
small-sized belt conveyor
belt conveyor with two or more characteristics of total driving power not greater than 75 kW, conveying capacity not greater than 500 t/h and length not more than 200m
2.1.9
long distance belt conveyor
belt conveyor with length not less than 3,000m
2.1.10
short distance belt conveyor
belt conveyor with length not greater than 80m
2.1.11
complex belt conveyor
belt conveyor with three or more characteristics of three or more variable slope sections, horizontal curve sections, multi-point driving units or braking units and length not less than 1,500m
2.1.12
high speed belt conveyor
belt conveyor with belt speed not less than 5 m/s
2.1.13
belt misalignment detector
device for detecting transverse displacement overrun in conveyor belt operation
2.2 Symbols
2.2.1 Cross-sectional area, conveying capacity:
A——Theoretical cross-sectional areas of the material on the conveyor belt;
A1——Upper cross-sectional area of the material on the conveyor belt;
A2——Central cross-sectional area of the material on the conveyor belt (4-idler, 5-idler);
A3——Lower cross-sectional area of the material on the conveyor belt (2-idler to 5-idler);
AN——Cross-sectional area of the material on the conveyor belt with design capacity;
ATC——Cross-sectional area of the material on the idler in the middle of the curve section;
ATI——Cross-sectional area of the material on idlers at inner curve side;
ATO——Cross-sectional area of the material on idlers at outer curve side;
Im——Design mass capacity of belt conveyor per second;
Q——Design capacity;
Qm——Theoretical capacity by mass;
QV——Theoretical capacity by volume.
2.2.2 Geometric characteristics, material characteristics:
aO——Spacing between idler sets in upper branch;
aU——Spacing between idler sets in lower branch;
AGr——Contact area between the cleaner and belt;
b——Effective width of materials on conveyor belt;
b1——Width of skirt board;
b2——Lap width of pipe belt;
b3——Width between the edges of the inner curve and the outer curve of the belt;
bS——Width of the belt supported on the side idler;
bWe——Ratio of lap width of pipe belt to actual pipe diameter;
B——Belt width;
d0——Inner diameter of pulley bearing;
d1——Maximum particle size of material;
dB——Thickness of textile fabric layer of belt or the diameter of steel wire rope of belt;
dg——Nominal pipe diameter (outer diameter) of pipe belt conveyor;
dm——Average particle size of the material;
dR——Diameter of idler;
dS——Actual pipe diameter (outer diameter) of pipe belt conveyor;
D——Pulley diameter;
Di——Diameter of the ith pulley;
DTr——Reference value of pulley diameter;
hi——Height difference of section i;
hk——Distance between the plane formed by the edges on both sides of the belt and the bus on the trough bottom idler;
hk1——Distance between the plane formed by the edges on both sides of the belt and the bus on the pulley;
hr, max——Maximum sag of belt between two adjacent idler sets;
hTr——Distance between the bus plane on the pulley and the bus plane on the trough bottom idler;
l2——Length of the lower side idler of the bearing idler set (4-idler, 5-idler);
l3——Length of the middle idler of bearing idler set (3-idler, 5-idler);
lb——Length of skirt board;
lbi——Length of skirt board in the acceleration zone of the receiving section;
lbo——Length of skirt board outside the acceleration zone of the receiving section;
lC——Spacing of idler sets in curve section;
li——Length of the section i;
lI——Contact length between the idler at inner curve side of idler set and the belt;
lN——Additional travel for belt installation;
lO——Contact length between the idler at outer curve side of idler set and the belt;
lo, 1——Length of the upper branch section 0–1;
lo, 2——Length of the upper branch section 1–2;
lp——Spacing between idler and window frame plate;
lPt——Minimum length of transition section of pipe belt conveyor;
lu, 1——Length of the lower branch section 0–1;
lu, 2——Length of the lower branch section 1–2;
lS——Spacing of idler sets in straight section;
lSbn——Length of buffer bed section;
lSp——Take-up travel of the take-up pulley;
lt——Minimum length of belt turnover section;
lTd, min——Minimum length reference value of trough transition section;
L——Length of belt conveyor (the unfolding length between the center lines of head and tail pulleys);
L1——Total length of pipe belt conveyor;
LS——Minimum length of straight line between the two curve sections;
R1——Curvature radius of convex arc section;
R2——Curvature radius of concave arc section;
R3——Minimum curvature radius of horizontal curve section;
Rmin——Minimum curvature radius;
t——Thickness of belt;
t1——Spacing between steel wire ropes of belt;
W——Opening size of U-shape conveyor belt;
α——Center angle corresponding to the convex arc (concave arc) section;
αc——Center angle corresponding to horizontal curve section;
αci——Central angle corresponding to the horizontal curve section of section j;
γ——Elevation angle of the inner curve side of idler set;
δ——Inclination angle of belt conveyor;
δi——Inclination angle of section i;
ε——Forward inclination angle of idler;
εi——Forward inclination angle of the idler on section i;
△lTd——Additional length of transition section;
θ——Angle of move of materials;
λ——Trough angle of trough idler set;
λ1——Trough angle of lower side idler of the trough idler set (4-idler, 5-idler);
λ2——Trough angle of lower side idler of the trough idler set (extended idler side);
λ3——Trough angle of upper side idler of the idler set (new added idler side);
ρ——Bulk density of bulk materials;
φ——Enclosure angle of the belt on the driving pulley.
2.2.3 Motion parameters, power and efficiency:
a——Average acceleration (deceleration) of the belt;
aB——Deceleration of braking stopping;
fpl——First-order natural frequency of the belt;
fpn——n-order natural frequency of the belt;
fr——Rotation frequency of idler;
g——Gravitational acceleration;
v——Belt speed;
v0——Speed component from feeding to the running direction of conveyor belt;
PA——Shaft power of the driving pulley;
PM——Total power required for the drive motor;
η——Driving efficiency from the brake wheel to the driving pulley;
η1——Driving efficiency of driving system under electric condition;
η2——Driving efficiency of the drive system under power generation condition.
2.2.4 Tension, resistance, torque and strength:
E0——Tensile stiffness of conveyor belt;
ELGK——Longitudinal elastic modulus of the conveyor belt;
F——Average tension of the belt on the pulley;
F1——Tight-side tension between the belt and pulley;
F2——Slack-side tension between the belt and pulley;
FA——Total inertial force of the moving body of belt conveyor;
FbA——Inertial resistance of materials in receiving section and frictional resistance between the material and belt;
FbA, o, i——Inertial resistance of the materials in receiving section of the lower branch section i and frictional resistance between the material and the belt;
FbA, u, i——Inertial resistance of the materials in receiving section of the lower branch section i and frictional resistance between the material and the belt;
FB——Brake force of braking stopping;
FBE——Driving peripheral force on the driving pulley during force reduction stopping;
FC1——Belt tension at the start point of convex arc section;
FC2——Belt tension at the end point of convex arc section;
FCh——Maximum tension of conveyor belt in horizontal curve section;
FCh1, o, i——Belt tension at the start point of the horizontal curve section of upper branch section i;
FCh2, o, i——Belt tension at the end point of the horizontal curve section of upper branch section i;
FCh1, u, i——Belt tension at the start point of the horizontal curve section of lower branch section i;
FCh2, u, i——Belt tension at the end point of the horizontal curve section of lower branch section i;
Fe——Allowable tension of conveyor belt;
Ff——Frictional resistance between the material in the acceleration zone of receiving section and the side walls of skirt board;
Ff, o, i——Frictional resistance between the materials in the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Ff, u, i——Frictional resistance between the materials in the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Fg——Tension of the conveyor belt at the natural frequency;
Fgl——Frictional resistance between the material outside the acceleration zone of receiving section and the side walls of skirt board;
Fgl, o, i——Frictional resistance between the materials outside the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Fgl，u，i——Frictional resistance between the materials outside the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
FH——Major resistance;
FH, i——Major resistance of section i;
FH, o——Major resistance of upper branch;
FH, o, i——Major resistance of upper branch section i;
FH, u——Major resistance of lower branch;
FH, u, i——Major resistance of lower branch section i;
Fi——Tension at point i in the operating direction of belt;
Fi—1——Tension at point i–1 of the belt;
F(i—1)~i——Resistances to motion to the section from point i–1 to point i of the belt;
Flc——Bending resistance of conveyor belt winding the pulley;
Flc, o, i——Bending resistance of the belt on the upper branch section i winding the pulley;
Flc, u, i——Bending resistance of the belt on the lower branch section i winding the pulley;
FIO——Vector sum of the tight-side tension and slack-side tension acting on the pulley belt and the gravity of the rotating part of the pulley;
Fmax——Maximum tension of the belt for stable operation;
Fmin——Minimum tension of belt for stable operation;
FN——Additional resistance;
FN, o——Additional resistances of the upper branch;
FN, o, i——Additional resistances of upper branch section i;
FN, u——Major resistance of lower branch;
FN, u, i——Additional resistances of lower branch section i;
FP——Pipe forming resistance of the belt;
FPt——Frictional resistance of plough unloader;
FPt, o, i——Frictional resistance of the plough unloader on the upper branch section i;
FPt, u, i——Frictional resistance of the plough unloader on the upper branch section i;
Fr——Frictional resistance of belt cleaner;
Fr, o, i——Frictional resistance of the belt cleaner on the upper branch section i;
Fr, u, i——Frictional resistance of the belt cleaner on the lower branch section i;
FR——Rigid resistance of the belt;
FRF——Balance force produced by axial friction between conveyor belt and idler;
FS——Special resistance;
FSbn——Frictional resistance of buffer bed;
FShn, o, i——Frictional resistance of the buffer bed on the upper branch section i;
FSbn, u, i——Frictional resistance of the buffer bed on the upper branch section i;
FSk——Frictional resistance between the belt and sealed apron of the skirt board;
FSk, o, i——Frictional resistance between the belt and sealed apron of skirt board on the upper branch section i;
FSk, u, i——Frictional resistance between the belt and sealed apron of skirt board on the lower branch section i;
FS, o——Special resistance of upper branch;
FS, o, i——Special resistance of upper branch section i;
FSP——Take-up force of the take-up pulley;
FSt——Lifting resistance;
FSt, i——Lifting resistance of section i;
FSt, o——Lifting resistance of the upper branch;
FSt, o, i——Lifting resistance of the upper branch section i;
FSt, u——Lifting resistance of the lower branch;
FSt, u, i——Lifting resistance of the lower branch section i;
FS, u——Special resistance of lower branch;
FS, u, i——Special resistance of lower branch section i;
Ft——Resistance to bearing of non-driving pulley;
Ft, o, i——Resistance to bearing of non-driving pulley on the upper branch section i;
Ft, u, i——Resistance to bearing of non-driving pulley on the lower branch section i;
FT——Horizontal centripetal force generated by belt tension in horizontal cure section;
FTC——Horizontal centripetal force of belt on intermediate idler of curve section of idler set;
FTI——Horizontal centripetal force of the belt on the idler at inner curve side of idler set;
FTC——Normal force of belt on the intermediate idler of the idler set in the curve section;
FTNI——Normal force of the belt on the idler at inner curve side of idler set;
FTNO——Normal force of the belt on the idler at outer curve side of idler set;
FTO——Horizontal centripetal force of the belt on the idler at outer curve side of idler set;
FTP——Total axial force of the belt on idler set;
FTPC——the axial force of belt on intermediate idler of curve section of idler set;
FTPI——Axial force of the belt on the idler at inner curve side of idler set;
FTPO——Axial force of the belt on the idler at outer curve side of idler set;
FTr——Peripheral force of the driving pulley under stable operation;
FTrA——Peripheral force of driving pulley under starting condition;
RTrB——Peripheral force of driving pulley under braking condition;
FU——Total resistances to motion;
FU, o, i——Resistances to motion of section 0–1 of upper branch;
FU, o, i——Resistances to motion of section 1–2 of upper branch;
FU, o, i——Resistances to motion of upper branch section i;
FU, u, 1——Resistances to motion of section 0–1 of lower branch;
FU, u, 2——Resistances to motion of section 1–2 of lower branch;
FU, u, i——Resistances to motion of lower branch section i;
FWB——Sliding force of belt along the axial direction of idler;
FWc——Additional bending resistance of convex arc section;
FWc, o, i——Additional bending resistances of the convex arc section on the upper branch section i;
FWc, u, i——Additional bending resistances of the convex arc section on the lower branch section i;
FWh——Additional resistance in horizontal curve section;
FWc——Additional resistance of horizontal curve section of section i;
FWh, o——Additional resistance of the horizontal curve section of upper branch;
FWh, u——Additional resistance of the horizontal curve section of lower branch;
FWh, o, i——Additional resistance of the horizontal curve section of upper branch section i;
FWh, u, i——Additional resistance of the horizontal curve section of lower branch section i;
FWM——Sliding force of material along the axial direction of idler.
Fε, i——Forward tilting frictional resistance of the idler on section i;
Fε, o, i——Forward tilting frictional resistance of the idler on the upper branch section i;
Fε, u, i——Forward tilting frictional resistance of the idler on the lower branch section i;
k——Average stress of conveyor belt;
kK, max——Maximum stress at the edge of the conveyor belt;
kk, a, max——Maximum stress at the belt edge under unstable operating conditions;
kk, zul——Allowable stress at the edge of belt in transition section;
kM——Stress of the central area of the belt;
kN——Nominal breaking strength or tensile strength of the belt;
kt——Reference fatigue strength of conveyor belt joint;
M——Rated backstop torque of backstops;
MB——Brake torque of the brake wheel;
Δk——Stress difference between the edge and the central area of the belt;
2.2.5 Mass, inertia, load and pressure:
JD, i——Moment of inertia of the i-th rotating part of the driving unit;
Jf——Moment of inertia of flywheels;
Ji——Moment of inertia of the ith pulley;
mD——Equivalent mass of the rotating components of the belt conveyor converted into linear motion of the belt;
mf——Equivalent mass of the flying wheel converted into linear motion of the belt;
m(i—1)~i——Equivalent mass of the moving body of the section from point i–1 to point i of the belt;
mL——Equivalent mass of the moving body of the belt conveyor in linear motion;
PBp——Allowable specific pressure of the conveyor belt;
pBs——Allowable specific pressure under the steel wire rope of steel cord conveyor belt;
PGr——Pressure between sweeper and conveyor belt;
POs——Static load of the upper branch idler;
POm——Dynamic load of the upper branch idler;
pSk——Effective positive pressure per unit length between belt and sealed apron;
PUs——Static load of the lower branch idler;
PUm——Dynamic load of the lower branch idler;
qB——Mass per unit length of belt;
qG——Mass per unit length of material on belt;
qG, i——Mass per unit length of material on belt of section i;
qG, o, i——Mass per unit length of materials on the belt in the upper branch section i;
qG, u, i——Mass per unit length of materials on the belt in the lower branch section i;
qR, i——Mass per unit length of the rotating part of idler of section i;
qRO——Mass per unit length of the rotating part of upper branch idler;
qRO, i——Mass per unit length of the rotating part of the idler in the upper branch section i;
qRU——Mass per unit length of the rotating part of lower branch idler;
qRU, i——Mass per unit length of the rotating part of the idler in the lower branch section i;
Foreword i
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Main parameters
3.1 Belt conveyor capacities
3.2 Belt speeds
3.3 Belt widths
4 Resistances to motion of belt conveyor
4.1 Resistances to motion of belt conveyor
4.2 Peripheral force required on the driving pulley
5 Belt tensions and driving power
5.1 Belt tensions
5.2 Tension calculation at belt’s each feature spot
5.3 Power of drive motor
5.4 Driving power distributions
5.5 Take-up forces
6 Starting and stopping
6.1 Inertial forces
6.2 Starting acceleration
6.3 Stopping deceleration
7 Declined belt conveyors
7.1 General requirements
7.2 Starting and braking
8 Main components
8.1 Belts
8.2 Pulleys
8.3 Idler set
8.4 Frames
8.5 Drive devices
8.6 Belt takeups
8.7 Brakes and backstops
8.8 Cleaners
9 Safety protection devices
9.1 General requirements
9.2 Emergency switches
9.3 Conveyor belt protections
9.4 Material flow detectors
9.5 Protections of declined belt conveyor and pipe belt conveyor
10 System arrangements
10.1 General requirements
10.2 Receiving material
10.3 Discharging material
10.4 Transition sections
10.5 Curves
10.6 Belt turnovers
10.7 Transfer stations and drive stations
10.8 Galleries and tunnels
11 Electrical and controls
11.1 Power supply
11.2 Power distribution
11.3 Single machine control
11.4 Centralized control
11.5 Intelligent control
11.6 Electrical protections and communication
12 Optimal designs and dynamic performance evaluations
13 Accessories
14 Firefighting and environmental protection
14.1 Firefighting
14.2 Dust prevention and control
14.3 Cleaning
14.4 Noise and light pollution control
15 Engineering construction
15.1 General requirements
15.2 Construction
15.3 Test running
16 Engineering acceptance
16.1 Engineering division
16.2 Engineering acceptance
Annex A Theoretical cross-sectional areas of the material on the belt of ordinary belt conveyor
Annex B Calculation of idler load
Explanation of wording in this standard
List of quoted standards
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
In accordance with the requirements of Notice on Printing the Plan of Development, Revision and Relevant Works of National Engineering Construction Standards and Codes in 2017 (JIANBIAO [2016] No. 248) issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China, this standard was developed by the drafting group through extensive investigation, careful summarization of practical experience, reference to relevant international standards and foreign advanced standards and on the basis of widely soliciting for opinions.
The main technical contents of this standard are: general provisions, terms and symbols, main parameters, resistances to motion of belt conveyor, belt tensions and driving power, starting and stopping, declined belt conveyors, main components, safety protection devices, system arrangements, electrical and controls, optimal designs and dynamic performance evaluations, accessories, firefighting and environmental protection, engineering construction, engineering acceptance, etc.
The main technical contents of the revision of this standard are:
1. The engineering design of horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor, as well as the engineering construction and acceptance of belt conveyor are added to the scope in the general provisions.
2. The clause on symbols is revised to terms and symbols, and a subclause of terms is added.
3. Main parameters:
(1) The calculation of the relation between the theoretical capacity and the design capacity of the belt conveyor and the calculation method of the theoretical capacity of the 4-idler and 5-idler sets of the ordinary belt conveyor are added;
(2) The calculation method of theoretical capacity and design capacity of U-shape belt conveyor is added;
(3) The calculation method of theoretical capacity and design capacity of pipe belt conveyor and the requirements of filling coefficient of pipe belt conveyor are added;
(4) The belt speed requirements of U-shape belt conveyor and pipe belt conveyor are added;
(5) The maximum particle size requirements of U-shape belt conveyor and pipe belt conveyor are added.
4. Resistances to motion of belt conveyor:
(1) The calculation methods of total resistance to motion, major resistance, additional resistance, special resistance and lifting resistance of ordinary belt conveyor according to sections are added;
(2) Various resistance calculation methods of horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor are added;
(3) The major special resistance and additional special resistance are combined into special resistance;
(4) The calculation method of frictional resistance between material and side wall of skirt board is modified;
(5) The calculation method of additional bending resistance of convex arc section is added;
(6) The calculation method of frictional resistance between the belt and sealed apron of the skirt board.
(7) The calculation method of frictional resistance of buffer bed is added.
5. In the clause of “starting and stopping”, the checking method for materials not sliding relatively on the conveyor belt is added.
6. Belt:
(1) The selection principle of belt is revised, and the belt is incorporated into the clause of “main components”;
(2) The selection requirements of belts for belt conveyor in ground gallery and tunnel are added;
(3) The selection requirements of belts for pipe belt conveyor are added;
(4) The method of calculating the safety coefficient of conveyor belt according to the characteristics and fatigue strength of conveyor belt joints is added;
(5) The provisions on calculating joints of steel cord belts and belts of textile construction in the annex are deleted.
7. Main components:
(1) The requirements for the length of the pulley of the pipe belt conveyor are added;
(2) The arrangement and type of idler set in curve section of horizontal curve belt conveyor are added;
(3) The arrangement, type, spacing and length of idler set of U-shape belt conveyor are added;
(4) The arrangement, type, spacing and length of idler set of pipe belt conveyor are added;
(5) The requirements for the frame of the curve section of the horizontal curve belt conveyor and the frame of the pipe belt conveyor are added.
8. Safety protection devices:
(1) The mandatory provisions of safety protection devices in transmission lines are modified;
(2) The requirements for the safety protection of the pipe belt conveyor are added;
9. System arrangements:
(1) The requirements for the maximum allowable inclination angle of belt conveyor are added;
(2) The calculation method of trough transition section length of ordinary belt conveyor and horizontal curve belt conveyor is added;
(3) The arrangement of receiving section, the length of trough transition section and the minimum curvature radius of convex arc section of U-shape belt conveyor are added;
(4) The arrangement and length of receiving section and trough transition section, the arrangement and calculation method of horizontal curve section and vertical curve section of pipe belt conveyor are added;
(5) The calculation method of minimum curvature radius of convex arc section of ordinary belt conveyor and horizontal curve belt conveyor is added;
(6) The requirements for the arrangement of horizontal curve section and minimum radius of curvature of horizontal curve belt conveyor and U-shape belt conveyor are added.
10. A subclause on intelligent control is added to the clause of “electrical and control”, and electrical protection and communication are combined into one subclause.
11. The clause of “optimal design and dynamic analysis” is renamed as “optimal design and dynamic performance evaluations”, and the subclause is deleted.
12. The clause of “ancillary equipment” is renamed as “accessories”.
13. The clause of “fire protection and dust prevention” is renamed as “firefighting and environmental protection”, and a subclause of “noise and light pollution control” is added.
14. The clause of “engineering construction” is added, which contains general requirements, construction and test running.
15. The clause of “engineering acceptance” is added, which contains engineering division and engineering acceptance.
The provisions printed in bold type in this standard are compulsory and must be enforced strictly.
Technical standard for belt conveyor engineering
1 General provisions
1.0.1 This standard is developed for the purpose of unifying and standardizing the engineering design, construction and acceptance of belt conveyor, ensuring engineering quality, ensuring safe production, and achieving advanced technology and economic rationality.
1.0.2 This standard is applicable to the engineering design, construction and acceptance of ordinary belt conveyor, horizontal curve belt conveyor, U-shape belt conveyor and pipe belt conveyor.
This standard is not applicable to the engineering design, construction and acceptance of special belt conveyors with steel wire rope traction and air cushion, etc.
1.0.3 The bulk density of bulk materials transported by belt conveyor should be 0.50 t/m3 to 2.80 t/m3, the material temperature should not be higher than 60°C, and the operating environment temperature should be −25°C to +40°C. When the above limit is exceeded, corresponding measures shall be taken.
1.0.4 In addition to this standard, the engineering design, construction and acceptance of belt conveyor shall also meet the requirements of relevant current national standards.
2 Terms and symbols
2.1 Terms
2.1.1
ordinary belt conveyor
belt conveyor whose horizontal plane is projected as straight line
2.1.2
horizontal curve belt conveyor
belt conveyor with curved sections projected on horizontal plane
2.1.3
U-shape belt conveyor
belt conveyor which is supported by a polygonal idler set composed of several idlers, and part or all of the conveyor belts have a U-shaped cross section
2.1.4
pipe belt conveyor
belt conveyor which is supported by a polygonal idler set composed of several idlers and whose belt has a circular cross section
2.1.5
theoretical capacity
theoretical volume or mass of materials transported per unit time at the maximum permissible carrying capacity of belt conveyor
2.1.6
design capacity
volume or mass of materials transported by belt conveyor per unit time required by engineering design
2.1.7
large sized belt conveyor
belt conveyor with two or more characteristics of total driving power not less than 1,500 kW, conveying capacity not less than 3,000 t/h and length not less than 1,500m
2.1.8
small-sized belt conveyor
belt conveyor with two or more characteristics of total driving power not greater than 75 kW, conveying capacity not greater than 500 t/h and length not more than 200m
2.1.9
long distance belt conveyor
belt conveyor with length not less than 3,000m
2.1.10
short distance belt conveyor
belt conveyor with length not greater than 80m
2.1.11
complex belt conveyor
belt conveyor with three or more characteristics of three or more variable slope sections, horizontal curve sections, multi-point driving units or braking units and length not less than 1,500m
2.1.12
high speed belt conveyor
belt conveyor with belt speed not less than 5 m/s
2.1.13
belt misalignment detector
device for detecting transverse displacement overrun in conveyor belt operation
2.2 Symbols
2.2.1 Cross-sectional area, conveying capacity:
A——Theoretical cross-sectional areas of the material on the conveyor belt;
A1——Upper cross-sectional area of the material on the conveyor belt;
A2——Central cross-sectional area of the material on the conveyor belt (4-idler, 5-idler);
A3——Lower cross-sectional area of the material on the conveyor belt (2-idler to 5-idler);
AN——Cross-sectional area of the material on the conveyor belt with design capacity;
ATC——Cross-sectional area of the material on the idler in the middle of the curve section;
ATI——Cross-sectional area of the material on idlers at inner curve side;
ATO——Cross-sectional area of the material on idlers at outer curve side;
Im——Design mass capacity of belt conveyor per second;
Q——Design capacity;
Qm——Theoretical capacity by mass;
QV——Theoretical capacity by volume.
2.2.2 Geometric characteristics, material characteristics:
aO——Spacing between idler sets in upper branch;
aU——Spacing between idler sets in lower branch;
AGr——Contact area between the cleaner and belt;
b——Effective width of materials on conveyor belt;
b1——Width of skirt board;
b2——Lap width of pipe belt;
b3——Width between the edges of the inner curve and the outer curve of the belt;
bS——Width of the belt supported on the side idler;
bWe——Ratio of lap width of pipe belt to actual pipe diameter;
B——Belt width;
d0——Inner diameter of pulley bearing;
d1——Maximum particle size of material;
dB——Thickness of textile fabric layer of belt or the diameter of steel wire rope of belt;
dg——Nominal pipe diameter (outer diameter) of pipe belt conveyor;
dm——Average particle size of the material;
dR——Diameter of idler;
dS——Actual pipe diameter (outer diameter) of pipe belt conveyor;
D——Pulley diameter;
Di——Diameter of the ith pulley;
DTr——Reference value of pulley diameter;
hi——Height difference of section i;
hk——Distance between the plane formed by the edges on both sides of the belt and the bus on the trough bottom idler;
hk1——Distance between the plane formed by the edges on both sides of the belt and the bus on the pulley;
hr, max——Maximum sag of belt between two adjacent idler sets;
hTr——Distance between the bus plane on the pulley and the bus plane on the trough bottom idler;
l2——Length of the lower side idler of the bearing idler set (4-idler, 5-idler);
l3——Length of the middle idler of bearing idler set (3-idler, 5-idler);
lb——Length of skirt board;
lbi——Length of skirt board in the acceleration zone of the receiving section;
lbo——Length of skirt board outside the acceleration zone of the receiving section;
lC——Spacing of idler sets in curve section;
li——Length of the section i;
lI——Contact length between the idler at inner curve side of idler set and the belt;
lN——Additional travel for belt installation;
lO——Contact length between the idler at outer curve side of idler set and the belt;
lo, 1——Length of the upper branch section 0–1;
lo, 2——Length of the upper branch section 1–2;
lp——Spacing between idler and window frame plate;
lPt——Minimum length of transition section of pipe belt conveyor;
lu, 1——Length of the lower branch section 0–1;
lu, 2——Length of the lower branch section 1–2;
lS——Spacing of idler sets in straight section;
lSbn——Length of buffer bed section;
lSp——Take-up travel of the take-up pulley;
lt——Minimum length of belt turnover section;
lTd, min——Minimum length reference value of trough transition section;
L——Length of belt conveyor (the unfolding length between the center lines of head and tail pulleys);
L1——Total length of pipe belt conveyor;
LS——Minimum length of straight line between the two curve sections;
R1——Curvature radius of convex arc section;
R2——Curvature radius of concave arc section;
R3——Minimum curvature radius of horizontal curve section;
Rmin——Minimum curvature radius;
t——Thickness of belt;
t1——Spacing between steel wire ropes of belt;
W——Opening size of U-shape conveyor belt;
α——Center angle corresponding to the convex arc (concave arc) section;
αc——Center angle corresponding to horizontal curve section;
αci——Central angle corresponding to the horizontal curve section of section j;
γ——Elevation angle of the inner curve side of idler set;
δ——Inclination angle of belt conveyor;
δi——Inclination angle of section i;
ε——Forward inclination angle of idler;
εi——Forward inclination angle of the idler on section i;
△lTd——Additional length of transition section;
θ——Angle of move of materials;
λ——Trough angle of trough idler set;
λ1——Trough angle of lower side idler of the trough idler set (4-idler, 5-idler);
λ2——Trough angle of lower side idler of the trough idler set (extended idler side);
λ3——Trough angle of upper side idler of the idler set (new added idler side);
ρ——Bulk density of bulk materials;
φ——Enclosure angle of the belt on the driving pulley.
2.2.3 Motion parameters, power and efficiency:
a——Average acceleration (deceleration) of the belt;
aB——Deceleration of braking stopping;
fpl——First-order natural frequency of the belt;
fpn——n-order natural frequency of the belt;
fr——Rotation frequency of idler;
g——Gravitational acceleration;
v——Belt speed;
v0——Speed component from feeding to the running direction of conveyor belt;
PA——Shaft power of the driving pulley;
PM——Total power required for the drive motor;
η——Driving efficiency from the brake wheel to the driving pulley;
η1——Driving efficiency of driving system under electric condition;
η2——Driving efficiency of the drive system under power generation condition.
2.2.4 Tension, resistance, torque and strength:
E0——Tensile stiffness of conveyor belt;
ELGK——Longitudinal elastic modulus of the conveyor belt;
F——Average tension of the belt on the pulley;
F1——Tight-side tension between the belt and pulley;
F2——Slack-side tension between the belt and pulley;
FA——Total inertial force of the moving body of belt conveyor;
FbA——Inertial resistance of materials in receiving section and frictional resistance between the material and belt;
FbA, o, i——Inertial resistance of the materials in receiving section of the lower branch section i and frictional resistance between the material and the belt;
FbA, u, i——Inertial resistance of the materials in receiving section of the lower branch section i and frictional resistance between the material and the belt;
FB——Brake force of braking stopping;
FBE——Driving peripheral force on the driving pulley during force reduction stopping;
FC1——Belt tension at the start point of convex arc section;
FC2——Belt tension at the end point of convex arc section;
FCh——Maximum tension of conveyor belt in horizontal curve section;
FCh1, o, i——Belt tension at the start point of the horizontal curve section of upper branch section i;
FCh2, o, i——Belt tension at the end point of the horizontal curve section of upper branch section i;
FCh1, u, i——Belt tension at the start point of the horizontal curve section of lower branch section i;
FCh2, u, i——Belt tension at the end point of the horizontal curve section of lower branch section i;
Fe——Allowable tension of conveyor belt;
Ff——Frictional resistance between the material in the acceleration zone of receiving section and the side walls of skirt board;
Ff, o, i——Frictional resistance between the materials in the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Ff, u, i——Frictional resistance between the materials in the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Fg——Tension of the conveyor belt at the natural frequency;
Fgl——Frictional resistance between the material outside the acceleration zone of receiving section and the side walls of skirt board;
Fgl, o, i——Frictional resistance between the materials outside the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
Fgl，u，i——Frictional resistance between the materials outside the acceleration zone of receiving section of the upper branch section i and the side walls of skirt board;
FH——Major resistance;
FH, i——Major resistance of section i;
FH, o——Major resistance of upper branch;
FH, o, i——Major resistance of upper branch section i;
FH, u——Major resistance of lower branch;
FH, u, i——Major resistance of lower branch section i;
Fi——Tension at point i in the operating direction of belt;
Fi—1——Tension at point i–1 of the belt;
F(i—1)~i——Resistances to motion to the section from point i–1 to point i of the belt;
Flc——Bending resistance of conveyor belt winding the pulley;
Flc, o, i——Bending resistance of the belt on the upper branch section i winding the pulley;
Flc, u, i——Bending resistance of the belt on the lower branch section i winding the pulley;
FIO——Vector sum of the tight-side tension and slack-side tension acting on the pulley belt and the gravity of the rotating part of the pulley;
Fmax——Maximum tension of the belt for stable operation;
Fmin——Minimum tension of belt for stable operation;
FN——Additional resistance;
FN, o——Additional resistances of the upper branch;
FN, o, i——Additional resistances of upper branch section i;
FN, u——Major resistance of lower branch;
FN, u, i——Additional resistances of lower branch section i;
FP——Pipe forming resistance of the belt;
FPt——Frictional resistance of plough unloader;
FPt, o, i——Frictional resistance of the plough unloader on the upper branch section i;
FPt, u, i——Frictional resistance of the plough unloader on the upper branch section i;
Fr——Frictional resistance of belt cleaner;
Fr, o, i——Frictional resistance of the belt cleaner on the upper branch section i;
Fr, u, i——Frictional resistance of the belt cleaner on the lower branch section i;
FR——Rigid resistance of the belt;
FRF——Balance force produced by axial friction between conveyor belt and idler;
FS——Special resistance;
FSbn——Frictional resistance of buffer bed;
FShn, o, i——Frictional resistance of the buffer bed on the upper branch section i;
FSbn, u, i——Frictional resistance of the buffer bed on the upper branch section i;
FSk——Frictional resistance between the belt and sealed apron of the skirt board;
FSk, o, i——Frictional resistance between the belt and sealed apron of skirt board on the upper branch section i;
FSk, u, i——Frictional resistance between the belt and sealed apron of skirt board on the lower branch section i;
FS, o——Special resistance of upper branch;
FS, o, i——Special resistance of upper branch section i;
FSP——Take-up force of the take-up pulley;
FSt——Lifting resistance;
FSt, i——Lifting resistance of section i;
FSt, o——Lifting resistance of the upper branch;
FSt, o, i——Lifting resistance of the upper branch section i;
FSt, u——Lifting resistance of the lower branch;
FSt, u, i——Lifting resistance of the lower branch section i;
FS, u——Special resistance of lower branch;
FS, u, i——Special resistance of lower branch section i;
Ft——Resistance to bearing of non-driving pulley;
Ft, o, i——Resistance to bearing of non-driving pulley on the upper branch section i;
Ft, u, i——Resistance to bearing of non-driving pulley on the lower branch section i;
FT——Horizontal centripetal force generated by belt tension in horizontal cure section;
FTC——Horizontal centripetal force of belt on intermediate idler of curve section of idler set;
FTI——Horizontal centripetal force of the belt on the idler at inner curve side of idler set;
FTC——Normal force of belt on the intermediate idler of the idler set in the curve section;
FTNI——Normal force of the belt on the idler at inner curve side of idler set;
FTNO——Normal force of the belt on the idler at outer curve side of idler set;
FTO——Horizontal centripetal force of the belt on the idler at outer curve side of idler set;
FTP——Total axial force of the belt on idler set;
FTPC——the axial force of belt on intermediate idler of curve section of idler set;
FTPI——Axial force of the belt on the idler at inner curve side of idler set;
FTPO——Axial force of the belt on the idler at outer curve side of idler set;
FTr——Peripheral force of the driving pulley under stable operation;
FTrA——Peripheral force of driving pulley under starting condition;
RTrB——Peripheral force of driving pulley under braking condition;
FU——Total resistances to motion;
FU, o, i——Resistances to motion of section 0–1 of upper branch;
FU, o, i——Resistances to motion of section 1–2 of upper branch;
FU, o, i——Resistances to motion of upper branch section i;
FU, u, 1——Resistances to motion of section 0–1 of lower branch;
FU, u, 2——Resistances to motion of section 1–2 of lower branch;
FU, u, i——Resistances to motion of lower branch section i;
FWB——Sliding force of belt along the axial direction of idler;
FWc——Additional bending resistance of convex arc section;
FWc, o, i——Additional bending resistances of the convex arc section on the upper branch section i;
FWc, u, i——Additional bending resistances of the convex arc section on the lower branch section i;
FWh——Additional resistance in horizontal curve section;
FWc——Additional resistance of horizontal curve section of section i;
FWh, o——Additional resistance of the horizontal curve section of upper branch;
FWh, u——Additional resistance of the horizontal curve section of lower branch;
FWh, o, i——Additional resistance of the horizontal curve section of upper branch section i;
FWh, u, i——Additional resistance of the horizontal curve section of lower branch section i;
FWM——Sliding force of material along the axial direction of idler.
Fε, i——Forward tilting frictional resistance of the idler on section i;
Fε, o, i——Forward tilting frictional resistance of the idler on the upper branch section i;
Fε, u, i——Forward tilting frictional resistance of the idler on the lower branch section i;
k——Average stress of conveyor belt;
kK, max——Maximum stress at the edge of the conveyor belt;
kk, a, max——Maximum stress at the belt edge under unstable operating conditions;
kk, zul——Allowable stress at the edge of belt in transition section;
kM——Stress of the central area of the belt;
kN——Nominal breaking strength or tensile strength of the belt;
kt——Reference fatigue strength of conveyor belt joint;
M——Rated backstop torque of backstops;
MB——Brake torque of the brake wheel;
Δk——Stress difference between the edge and the central area of the belt;
2.2.5 Mass, inertia, load and pressure:
JD, i——Moment of inertia of the i-th rotating part of the driving unit;
Jf——Moment of inertia of flywheels;
Ji——Moment of inertia of the ith pulley;
mD——Equivalent mass of the rotating components of the belt conveyor converted into linear motion of the belt;
mf——Equivalent mass of the flying wheel converted into linear motion of the belt;
m(i—1)~i——Equivalent mass of the moving body of the section from point i–1 to point i of the belt;
mL——Equivalent mass of the moving body of the belt conveyor in linear motion;
PBp——Allowable specific pressure of the conveyor belt;
pBs——Allowable specific pressure under the steel wire rope of steel cord conveyor belt;
PGr——Pressure between sweeper and conveyor belt;
POs——Static load of the upper branch idler;
POm——Dynamic load of the upper branch idler;
pSk——Effective positive pressure per unit length between belt and sealed apron;
PUs——Static load of the lower branch idler;
PUm——Dynamic load of the lower branch idler;
qB——Mass per unit length of belt;
qG——Mass per unit length of material on belt;
qG, i——Mass per unit length of material on belt of section i;
qG, o, i——Mass per unit length of materials on the belt in the upper branch section i;
qG, u, i——Mass per unit length of materials on the belt in the lower branch section i;
qR, i——Mass per unit length of the rotating part of idler of section i;
qRO——Mass per unit length of the rotating part of upper branch idler;
qRO, i——Mass per unit length of the rotating part of the idler in the upper branch section i;
qRU——Mass per unit length of the rotating part of lower branch idler;
qRU, i——Mass per unit length of the rotating part of the idler in the lower branch section i;
Contents of GB 50431-2020
Foreword i
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Main parameters
3.1 Belt conveyor capacities
3.2 Belt speeds
3.3 Belt widths
4 Resistances to motion of belt conveyor
4.1 Resistances to motion of belt conveyor
4.2 Peripheral force required on the driving pulley
5 Belt tensions and driving power
5.1 Belt tensions
5.2 Tension calculation at belt’s each feature spot
5.3 Power of drive motor
5.4 Driving power distributions
5.5 Take-up forces
6 Starting and stopping
6.1 Inertial forces
6.2 Starting acceleration
6.3 Stopping deceleration
7 Declined belt conveyors
7.1 General requirements
7.2 Starting and braking
8 Main components
8.1 Belts
8.2 Pulleys
8.3 Idler set
8.4 Frames
8.5 Drive devices
8.6 Belt takeups
8.7 Brakes and backstops
8.8 Cleaners
9 Safety protection devices
9.1 General requirements
9.2 Emergency switches
9.3 Conveyor belt protections
9.4 Material flow detectors
9.5 Protections of declined belt conveyor and pipe belt conveyor
10 System arrangements
10.1 General requirements
10.2 Receiving material
10.3 Discharging material
10.4 Transition sections
10.5 Curves
10.6 Belt turnovers
10.7 Transfer stations and drive stations
10.8 Galleries and tunnels
11 Electrical and controls
11.1 Power supply
11.2 Power distribution
11.3 Single machine control
11.4 Centralized control
11.5 Intelligent control
11.6 Electrical protections and communication
12 Optimal designs and dynamic performance evaluations
13 Accessories
14 Firefighting and environmental protection
14.1 Firefighting
14.2 Dust prevention and control
14.3 Cleaning
14.4 Noise and light pollution control
15 Engineering construction
15.1 General requirements
15.2 Construction
15.3 Test running
16 Engineering acceptance
16.1 Engineering division
16.2 Engineering acceptance
Annex A Theoretical cross-sectional areas of the material on the belt of ordinary belt conveyor
Annex B Calculation of idler load
Explanation of wording in this standard
List of quoted standards