GB/T 34629-2017Conveyor belts -- Determination of minimum pulley diameters (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard is modified, using the redrafting method, in relation to ISO 3684.1990

Conveyor belts - Determination of minimum pulley diameters (English version).

This standard differs technically from ISO 3684.1990.These different clauses are

indicated by a vertical single line (|) in the margin. The technical differences and their

reasons are as follows.

-- Regarding normative references, this standard has made adjustments with

technical differences to adapt to Chinese technical conditions. These

adjustments are mainly reflected in Chapter 2, "Normative references," and are

as follows.

lambda ISO 3.1973 has been replaced by GB/T 321, which is identical to the

international standard (see Chapter 2 and Chapter 4);

lambda ISO 7590.1988 has been replaced by GB/T 5753, which is identical to the

international standard (see Chapter 2 and 3.1.2);

lambda ISO 583.1975 has been replaced by GB/T 32331, which is identical to the

international standard (see Chapter 2 and 3.1.1);

lambda ISO 21183-1 has been replaced by HG/T 4601.1, which is identical to the

international standard (see Chapter 1);

lambda The year designation for ISO 1536.1975 has been removed (see Chapter 2).

-- The title of Chapter 3 has been revised, and introductory paragraphs for terms

and definitions have been added (see Chapter 3).

-- The letters representing the thickness of the fabric carcass and the thickness of

the steel cord carcass have been modified (see 3.1).

The following editorial changes have also been made to this standard.

-- The international standard amendment (ISO 3684.1990/Amd.1.2006) has been

incorporated into this standard, and the revised clauses have been marked with

a vertical double line (||) in the margin.

-- Note 3 in Chapter 1 has been deleted.

-- The term "Belts" in the ISO 1536 standard title has been corrected to "Belt

pulleys".

Conveyor belts - Determination of minimum pulley

diameters

1 Scope

This standard specifies the method for calculating the minimum pulley diameter of a

conveyor belt.

This standard applies to rubber or plastic conveyor belts with fabric or metal carcasses.

These belts have carcasses of varying thicknesses and materials and are used under any

expected tension, but not exceeding the recommended maximum belt tension (RMBT).

This standard does not apply to light conveyor belts specified in HG/T 4601.1.

This standard does not apply to conveyor belts with a belt carcass thickness exceeding

20 mm or conveyor belts with a rubber or plastic interlayer thickness exceeding 0.8 mm,

between fabric layers.

This standard also does not apply to heat-resistant conveyor belts that transport products

with temperatures exceeding 100 °C or to conveyor belts with ambient temperatures

below -40 °C.

When the pulley diameter is too small relative to the belt carcass structure, it will lead

to premature damage to the conveyor belt.

NOTE 1.The values given in this standard are the minimum values used when corresponding values are

unavailable from conveyor belt manufacturers.

NOTE 2.The method for calculating the minimum pulley diameter given in this standard applies to all

general applications. In special applications, conveyor belt manufacturers may permit the use of pulleys

with diameters smaller than the minimum diameter determined according to this standard.

2 Normative references

The following documents are essential for the application of this document. For any

dated reference, only the version corresponding to that date applies to this document;

for any undated reference, the latest version (including all amendments) applies to this

document.

GB/T 321 Preferred numbers - Series of preferred numbers (GB/T 321-2005, ISO

3.1973, IDT)

GB/T 5753 Steel cord conveyor belts - Methods for the determination of total

thickness and cover thickness (GB/T 5753-2013, ISO 7590.2009, IDT)

GB/T 32331 Conveyor belts with a textile carcass - Total belt thickness and

thickness of constitutive elements - Test methods (GB/T 32331-2015, ISO

583.2007, IDT)

HG/T 4601.1 Light conveyor belts - Part 1.Principal characteristics and

applications (HG/T 4601.1-2014, ISO 21183-1.2005, IDT)

ISO 1536 Continuous mechanical handling equipment for loose bulk materials -

Troughed belt conveyors (other than portable conveyors) - Belt pulleys

3 Terms and definitions

The following terms and definitions apply to this document.

4 Pulley diameters

The pulley diameter series is arranged according to the R10 series of preferred numbers

specified in GB/T 321 (of which 1400 mm and 1800 mm are from the R20 series of

preferred numbers) (see Table 1).

Table 1 includes all the values defined in ISO 1536.

5 Determination of the recommended minimum pulley diameter