Tiêu chuẩn iso 00703 2017

© ISO 2017 Conveyor belts — Transverse flexibility (troughability) — Test method Courroies transporteuses — Flexibilité transversale (aptitude à la mise en auge) — Méthode d’essai INTERNATIONAL STANDA[.]

Conve yor belts — Transver se fle x ibility

Co r oie s tra sporteuse s — Fle xibilité tra sve sale (a titude à la

mise en a ge) — Méth de d’e ssai

Fourth edition

2 17-0

Refer ence n mb r

COPYRIGHT PROTECTED DOCUMENT

© ISO 2017, P blshed in Sw itz rlan

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F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms and definitions 1

4 Symbols 1

5 Principle 1

6 A pparatus (se Fig ur e 1) 2

7 Test piec e 3

7.1 Dimensions 3

7.2 Conditioning 3

8 Proc ed re .3

9 Calculation and ex pr es io of r esults 4

10 Test rep r t 4

Biblog raphy 5

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www iso org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www iso org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www iso org iso/ for word html

The committ ee r sp nsible for this document is ISO/TC 41 Puleys a d belts (includin ve belts),

Subcommitt ee SC3, Co vey r belts

This fourth edition of ISO 7 3 canc ls an r plac s ISO 7 3:2 0 , of w hich it cons itut es a minor

r vision

A larg e n mbe of conveyor belt work in the sha e of a trough If a conveyor belt is t oo s if transve sely

it does not r s on the c ntral idle role w hen u lo ded It b lanc is then u s a le an it is subje t t o

lat eral tra el, w hich ma cause it des ruction

It is p s ible t o make a se tion of the conveyor belt take on the sha e of a trough un e it own mas , b

suspen ing the se tion b it edg es Howeve , this does not ne es ariy in icat e w hat ha pens w hen the

convey r belt isnot car ying a lo d

The r sult o tained from the t es method spe if ied in this document wi l, howeve , alow an

as es ment t o be made as t o w hethe the troughing charact eris ics of the conveyor belt ar suita le for

the int en ed a plcation

Conveyor belts — T ransverse flex ibility (tr oughability) —

This document spe ifies a t es method for det ermining the transve se flexibi ity ( rougha i ty) of a

convey r belt, ex r s ed as a ratio, F/ L The method is not suita le or v ld for lght convey r belt as

desc ibed in ISO 2 1 3-1

NOTE T e transver e “fle ibility” determined by the method des rib d in this document is only in irectly

as ociated with the inver e of fle ural mod lus as specif ied in ISO 178 Nor do s it take into consideration the

diferences in “fle ibility” as e hibit ed by thre -point an four -point b n ing, which takes ac ou t of the fle ural

strain an the thick es of the test piece

2 Normati ve r eferences

The folowing document ar r fe r d t o in the t ext in such a wa that some or al of their cont ent

cons itut es r q ir ment of this document F or dat ed r fe enc s, only the edition cit ed a ples F or

un at ed r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment ) a ples

ISO 5 3, Co vey r belts w ith a tex tie c arc as s — Total belt thicknes s a d thicknes s o c ons tituti ve

element — Tes t meth ds

ISO 7 9 , Ste l c ord c on ey r belts — Meth ds fr the dete min tion o total thicknes s a d c ove thicknes s

ISO 1 5 3, Co vey r belts — Tes t atmos phe es a d c onditio in pe iods

3 Terms and definitions

No t erms an def initions ar lst ed in this document

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— IECEle tro edia: a aia le at ht p:/ www ele tro edia org

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www iso org o p

F vertical defle tion in t es pie e cor e t ed for belt hick es , in mi lmetr s

F

1

vertical defle tion in t es pie e, in mi lmetr s( e Figur s1 an 2)

L length of tes pie e when laid flat, in mi imetr s (eq iv alent to ful width of ins aled convey r belt)

d thick es of the t es pie e, in mi imetr s ( e Figur 2)

A t es pie e, consis ing of a transve se se tion of belt of length, L, is suspen ed at b th en s with the

car ying fac up e mos , so that the up e edg es of these en s ar in the same horizontal plane

The transve se flexibi ty (rougha i ty) is det ermined b measuring the ma imum defle tion, F, of the

t es pie e u de it own weight It is ex r s ed as the ratio F/L

6 A pparatus ( ee Fig ure 1)

6.1 T wo r ig id hor izontal bar s, convenien y sup orted The u sup orted leng th of the b rs shal be

g r eate than the tes leng th, L

6.2 T wo clamps, to be atached to the en sof the tes pie e, with suspension lug s for atachment to the

suspen ing wir es The cons r uction of the clamps shal alow for a r ig id b r or s raightedg e to be plac d

in contact with the belt , as shown in Fig ure 2, to es a lsh the datum lne ne es ary for measuring the

defle tion The clamps shal be suficiently wide an rig id to maintain the width of the tes pie es free

from curv tur e, and shal exe t no ben ing moment which might influenc the defle tion of the tes pie e

6.3 F ur ste l suspensio wir es, of eq al leng th, each with adjus a le s ir ups on b th ends for

attachment to the horizontal b rs an clamps The attachment to thehorizontal b rs an clamps should

not impede the free mo ement of the adjustable s ir ups when maintaining the suspension wir es in the

ve tical d ring the test

6.4 Me ns of me suring the deflectio , F

1 , to the near es mi imetr e ( e Fig ure 2)

Dimensions in milimetr es

Key

1 four ste l suspension w ires

2 two rig id horizontal b r

3 two clamps

4 plumbline

5 test piece

6 rig id b r to esta lish datum line

Figure 1 — Typical apparatus for me suring transver e flexibi ity ( ro ghabi ity)

7 Test piec e

7.1 Dimensions

The t es pie e shal conform t o the fol owing r q ir ment :

a) it form shal be a r ctangular p ralelepiped;

b) it length, L, shal be the o e al width of the ins aled convey r belt, w hen laid flat ;

c) it width, in the longitu inal dir ction of the belt, shal be (1 0 ± 2)mm;

d) it thick es , d, shal be the o e al thick es of the convey r belt

Con ition the t es pie es in ac ordanc with ISO 1 5 3, using atmosphe e A, B or C, an then car y out

the t es s immediat ely aft er completion of the con itioning pe iod

Immediat ely befor the t es , ensur that the clamps ar fr e t o swivel an do not ex ert a ben ing for e

on the t es pie e

Measur the flat length, L, ofthe t es pie e in mi imetr s

Measur the thicknes , d, of the t es pie e, in mi lmetr s, in ac ordanc with ISO 5 3 or ISO 7 9

Fit the t es pie e, car ying fac up e mos , w hie in the flat p sition, int o the suspended clamps

Alow the t es pie e t o fal un e it own weight from the flat position int o the troughed p sition

A djus the a p ratus so that the suspen ing for es act verticaly throughout he t es pe iod

Aft er 5 min, measur the ve tical defle tion, F

1 , of the t es pie e ( e Figur 2) an ad t o this

measur ment the dimension 0,5d t o give the v lue for F

Key

d thicknes of test piece

F

1

vertical deflection

1 datum line

Figure 2 — Determination of deflectio , F

1

9 Calculation and ex pres ion ofresults

Calculat e the v lue of Ffrom F ormula (1):

F = F

1

Ex r s the r sult of the measur ment in the form of F/L

10 Test repor t

The t es r p rt shal contain the fol owing information:

a) r fe enc t o this document, i.e ISO 7 3;

b) identif ication of the conveyor belt t est ed;

c) thet es length, L ( e Clause 4);

d) thethicknes of the t es pie e, d ( e 7.1);

e) thecon itioning atmosphe eused (A, B or C);

f) thev lueof ratio F/L;

g) thedat e of the t es

Bibl og raphy

[1] ISO 2 1 3-1, Lig t c on ey r belts — Part 1: Princ ip l charac te i s tic s a d a plc atio s

[2] ISO 1 8, Plas tic s — Dete min tio  o flex ural pro erties

ICS  53.040.20

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