1、June 2017 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 53.040.20!%e_“2666160www.din.deDIN
2、EN ISO 703Conveyor belts Transverse flexibility (troughability) Test method (ISO 703:2017);English version EN ISO 703:2017,English translation of DIN EN ISO 703:2017-06Frdergurte Biegsamkeit in Querrichtung (Muldungsfhigkeit) Prfverfahren (ISO 703:2017);Englische Fassung EN ISO 703:2017,Englische be
3、rsetzung von DIN EN ISO 703:2017-06Courroies transporteuses Flexibilit transversale (aptitude la mise en auge) Mthode dessai (ISO 703:2017);Version anglaise EN ISO 703:2017,Traduction anglaise de DIN EN ISO 703:2017-06SupersedesDIN EN ISO 703:200803www.beuth.deDocument comprises 14 pagesDTranslation
4、 by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.06.17 DIN EN ISO 703:2017-06 2 A comma is used as the decimal marker. National foreword This document (EN ISO 703:2017) has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (inclu
5、ding veebelts)” (Secretariat: SAC, China), Subcommittee SC 3 “Conveyor belts” (twin Secretariat: SAC, China and JISC, Japan) in collaboration with Technical Committee CEN/TC 188 “Conveyor belts” (Secretariat: SNV, Switzerland). The responsible German body involved in its preparation was DIN-Normenau
6、sschuss Elastomer-Technik (DIN Standards Committee Elastomer Technology), Working Committee NA 045-02-05 AA “Conveyor belts”. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 21183-1 DIN EN ISO 21183-1 ISO 7590 DIN EN ISO 7590 ISO 583 DI
7、N EN ISO 583 Amendments This standard differs from DIN EN ISO 703:2008-03 as follows: a) the standard has been editorially and technically revised (minor revision); b) Clause 2 has been updated. Previous editions DIN 22109-6: 1988-02 DIN EN ISO 703-1: 2000-07 DIN EN ISO 703: 2008-03 DIN EN ISO 703:2
8、017-06 3 National Annex NA (informative) Bibliography DIN EN ISO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications DIN EN ISO 7590, Steel cord conveyor belts Methods for the determination of total thickness and cover thickness DIN EN ISO 583, Conveyor belts with a text
9、ile carcass Total belt thickness and thickness of constitutive elements Test methods DIN EN ISO 703:2017-06 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 703 January 2017 ICS 53.040.20 Supersedes EN ISO 703:2007English Version Conveyor belts - Transverse
10、 flexibility (troughability) - Test method (ISO 703:2017) Courroies transporteuses - Flexibilit transversale (aptitude la mise en auge) - Mthode dessai(ISO 703:2017) Frdergurte - Biegsamkeit in Querrichtung (Muldungsfhigkeit) - Prfverfahren (ISO 703:2017) This European Standard was approved by CEN o
11、n 8 January 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards ma
12、y be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified
13、to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland
14、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC
15、Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 703:2017 EEuropean foreword 3Introduction 51 Scope . 62 Normative references 63 Terms and definitions . 64 Symbols 65 Pri
16、nciple 66 Apparatus (see Figure 1) 77 Test piece 87.1 Dimensions . 87.2 Conditioning 88 Procedure. 89 Calculation and expression of results . 910 Test report . 9Bibliography . 10Contents PageDIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 2Foreword . 4European foreword This document (EN ISO 703:2017) has
17、 been prepared by Technical Committee ISO/TC 41”Pulleys and belts (including veebelts)” in collaboration with Technical Committee CEN/TC 188 “Conveyor belts” the secretariat of which is held by SNV. This European Standard shall be given the status of a national standard, either by publication of an
18、identical text or by endorsement, at the latest by July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held r
19、esponsible for identifying any or all such patent rights. This document supersedes EN ISO 703:2007. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, C
20、yprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
21、 the United Kingdom. Endorsement notice The text of ISO 703:2017 has been approved by CEN as EN ISO 703:2017 without any modification. DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
22、(ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, g
23、overnmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further main
24、tenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).A
25、ttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduc
26、tion and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to co
27、nformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.The committee responsible for this document is ISO/TC 41 Pulleys and belts (including v
28、eebelts), Subcommittee SC 3, Conveyor belts.This fourth edition of ISO 703 cancels and replaces ISO 703:2007, of which it constitutes a minor revision.DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 4 IntroductionA large number of conveyor belts work in the shape of a trough. If a conveyor belt is too st
29、iff transversely it does not rest on the central idler roller when unloaded. Its balance is then unstable and it is subject to lateral travel, which may cause its destruction.It is possible to make a section of the conveyor belt take on the shape of a trough under its own mass, by suspending the sec
30、tion by its edges. However, this does not necessarily indicate what happens when the conveyor belt is not carrying a load.The results obtained from the test method specified in this document will, however, allow an assessment to be made as to whether the troughing characteristics of the conveyor bel
31、t are suitable for the intended application.DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 5 1 ScopeThis document specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method is not suitable or valid for light conveyor belts
32、 as described in ISO 21183-1.NOTE The transverse “flexibility” determined by the method described in this document is only indirectly associated with the inverse of flexural modulus as specified in ISO 178. Nor does it take into consideration the differences in “flexibility” as exhibited by three-po
33、int and four-point bending, which takes account of the flexural strain and the thickness of the test piece.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only t
34、he edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 583, Conveyor belts with a textile carcass Total belt thickness and thickness of constitutive elements Test methodsISO 7590, Steel cord conveyor belts Methods for th
35、e determination of total thickness and cover thicknessISO 18573, Conveyor belts Test atmospheres and conditioning periods3 Terms and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IE
36、C Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4 SymbolsF vertical deflection in test piece corrected for belt thickness, in millimetresF1vertical deflection in test piece, in millimetres (see Figures 1 and 2)L
37、length of test piece when laid flat, in millimetres (equivalent to full width of installed conveyor belt)d thickness of the test piece, in millimetres (see Figure 2).5 PrincipleA test piece, consisting of a transverse section of belt of length, L, is suspended at both ends with the carrying face upp
38、ermost, so that the upper edges of these ends are in the same horizontal plane.DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 6 The transverse flexibility (troughability) is determined by measuring the maximum deflection, F, of the test piece under its own weight. It is expressed as the ratio F/L.6 Appa
39、ratus (see Figure 1)6.1 Two rigid horizontal bars, conveniently supported. The unsupported length of the bars shall be greater than the test length, L.6.2 Two clamps, to be attached to the ends of the test piece, with suspension lugs for attachment to the suspending wires. The construction of the cl
40、amps shall allow for a rigid bar or straightedge to be placed in contact with the belt, as shown in Figure 2, to establish the datum line necessary for measuring the deflection. The clamps shall be sufficiently wide and rigid to maintain the width of the test pieces free from curvature, and shall ex
41、ert no bending moment which might influence the deflection of the test piece.6.3 Four steel suspension wires, of equal length, each with adjustable stirrups on both ends for attachment to the horizontal bars and clamps. The attachments to the horizontal bars and clamps should not impede the free mov
42、ement of the adjustable stirrups when maintaining the suspension wires in the vertical during the test.6.4 Means of measuring the deflection, F1, to the nearest millimetre (see Figure 2).Dimensions in millimetresKey1 four steel suspension wires2 two rigid horizontal bars3 two clamps4 plumb line5 tes
43、t piece6 rigid bar to establish datum lineFigure 1 Typical apparatus for measuring transverse flexibility (troughability)DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 7 7 Test piece7.1 DimensionsThe test piece shall conform to the following requirements:a) its form shall be a rectangular parallelepiped
44、;b) its length, L, shall be the overall width of the installed conveyor belt, when laid flat;c) its width, in the longitudinal direction of the belt, shall be (150 2) mm;d) its thickness, d, shall be the overall thickness of the conveyor belt.7.2 ConditioningCondition the test pieces in accordance w
45、ith ISO 18573, using atmosphere A, B or C, and then carry out the tests immediately after completion of the conditioning period.8 ProcedureImmediately before the test, ensure that the clamps are free to swivel and do not exert a bending force on the test piece.Measure the flat length, L, of the test
46、 piece in millimetres.Measure the thickness, d, of the test piece, in millimetres, in accordance with ISO 583 or ISO 7590.Fit the test piece, carrying face uppermost, while in the flat position, into the suspended clamps.Allow the test piece to fall under its own weight from the flat position into t
47、he troughed position.Adjust the apparatus so that the suspending forces act vertically throughout the test period.After 5 min, measure the vertical deflection, F1, of the test piece (see Figure 2) and add to this measurement the dimension 0,5d to give the value for F.Keyd thickness of test pieceF1vertical deflection1 datum lineFigure 2 Determination of deflection, F1DIN EN ISO 703:2017-06 EN ISO 703:2017 (E) 8 9 Calculation and expression of resultsCalculate the value of F from Formula (1):F = F1+ 0,5d (1)Express the results of the measurements in the form of F/L.10 Test
