1、BS EN ISO 703:2017Conveyor belts Transverseflexibility (troughability) Test method (ISO 703:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 703:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 703:2017. Its
2、upersedes BS EN ISO 703:2007 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the n
3、ecessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 94912 8 ICS 53.040.20 Compliance with a British Standard cannot confer immunity from legal obligations.This British Stand
4、ard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017.Amendments/corrrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 703 January 2017 ICS 53.040.20 Supersedes EN ISO 703:2007English
5、 Version Conveyor belts - Transverse 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 Eu
6、ropean Standard was approved by CEN on 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
7、concerning such national standards may 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 membe
8、r into its own language and notified 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, Fran
9、ce, Germany, Greece, Hungary, Iceland, 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 EUROPI
10、SCHES KOMITEE FR NORMUNG CEN-CENELEC 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 EBS EN ISO 703:2017EN ISO 703:2017 (E) 3 European foreword This document (E
11、N ISO 703:2017) has 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
12、 publication of an 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
13、shall not be held responsible 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, B
14、ulgaria, Croatia, Cyprus, 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, Swit
15、zerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 703:2017 has been approved by CEN as EN ISO 703:2017 without any modification. BS EN ISO 703:2017ISO 703:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 15 Principle 16
16、Apparatus (see Figure 1) 27 Test piece 37.1 Dimensions . 37.2 Conditioning 38 Procedure. 39 Calculation and expression of results . 410 Test report . 4Bibliography 5 ISO 2017 All rights reserved iiiContents PageBS EN ISO 703:2017ISO 703:2017(E)ForewordISO (the International Organization for Standard
17、ization) is a worldwide federation of national standards bodies (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
18、be represented on that committee. International organizations, governmental 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
19、to develop this document and those intended for its further maintenance 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
20、the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention 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 identifie
21、d during the development of the document will be in the Introduction 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
22、 the meaning of ISO specific terms and expressions related to conformity 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 responsib
23、le for this document is ISO/TC 41 Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This fourth edition of ISO 703 cancels and replaces ISO 703:2007, of which it constitutes a minor revision.iv ISO 2017 All rights reservedBS EN ISO 703:2017ISO 703:2017(E)IntroductionA large n
24、umber of conveyor belts work in the shape of a trough. If a conveyor belt is too stiff 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 co
25、nveyor belt take on the shape of a trough under its own mass, by suspending the section 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 as
26、sessment to be made as to whether the troughing characteristics of the conveyor belt are suitable for the intended application. ISO 2017 All rights reserved vBS EN ISO 703:2017BS EN ISO 703:2017Conveyor belts Transverse flexibility (troughability) Test method1 ScopeThis document specifies a test met
27、hod 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 as described in ISO 21183-1.NOTE The transverse “flexibility” determined by the method described in this document is only indirec
28、tly 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-point and four-point bending, which takes account of the flexural strain and the thickness of the test piece.2 Normative referencesT
29、he 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 the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies
30、.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 the determination of total thickness and cover thicknessISO 18573, Conveyor belts Test atmospheres and conditioning periods3 Terms a
31、nd definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .or
32、g/ 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 length of test piece when laid flat, in millimetres (equivalent to full width of installed conveyor belt)d thickness of the test p
33、iece, 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 uppermost, so that the upper edges of these ends are in the same horizontal plane.INTERNATIONAL STANDARD ISO 703:2017(E) ISO 2017 All
34、 rights reserved 1BS EN ISO 703:2017ISO 703:2017(E)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 Apparatus (see Figure 1)6.1 Two rigid horizontal bars, conveniently supported
35、. 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 clamps shall allow for a rigid bar or straightedge to be placed in contact
36、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 exert no bending moment which might influence the deflection of the test pi
37、ece.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 movement of the adjustable stirrups when maintaining the suspension wires in
38、 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 test piece6 rigid bar to establish datum lineFigure 1 Typical apparatus for
39、measuring transverse flexibility (troughability)2 ISO 2017 All rights reservedBS EN ISO 703:2017ISO 703:2017(E)7 Test piece7.1 DimensionsThe test piece shall conform to the following requirements:a) its form shall be a rectangular parallelepiped;b) its length, L, shall be the overall width of the in
40、stalled 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 with ISO 18573, using atmosphere A, B or C, and then car
41、ry 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 piece in millimetres.Measure the thickness, d, of the
42、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 the troughed position.Adjust the apparatus so that the s
43、uspending 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
44、deflection, F1 ISO 2017 All rights reserved 3BS EN ISO 703:2017ISO 703:2017(E)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 reportThe test report shall contain the following informat
45、ion:a) reference to this document, i.e. ISO 703;b) identification of the conveyor belt tested;c) the test length, L (see Clause 4);d) the thickness of the test piece, d (see 7.1);e) the conditioning atmosphere used (A, B or C);f) the value of ratio F/L;g) the date of the test.4 ISO 2017 All rights r
46、eservedBS EN ISO 703:2017ISO 703:2017(E)Bibliography1 ISO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications2 ISO 178, Plastics Determination of flexural properties ISO 2017 All rights reserved 5This page deliberately left blankThis page deliberately left blankBSI is th
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