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1、BRITISH STANDARD BS EN ISO 703:2007 Conveyor belts Transverse flexibility (troughability) Test method The European Standard EN ISO 703:2007 has the status of a British Standard ICS 53.040.20 ? Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 20
2、07, Uncontrolled Copy, (c) BSI BS EN ISO 703:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007 ISBN 978 0 580 58460 2 National foreword This British Standard was published by BSI. It is the UK implementation of EN ISO
3、 703:2007. It supersedes BS EN ISO 703-1:2000 which is withdrawn.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
4、to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London So
5、uth Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 703 June 2007 ICS 53.040.20 English Version Conveyor belts - Transverse flexibility (troughability) - Test method (ISO 703:2007) Courroies transporteuses - Fle
6、xibilit transversale (aptitude la mise en auge) - Mthode dessai (ISO 703:2007) Frdergurte - Biegsamkeit in Querrichtung (Muldungsfhigkeit) - Prfverfahren (ISO 703:2007) This European Standard was approved by CEN on 23 May 2007. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
7、s 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 may be obtained on application to the CEN Management Centre or to any CEN member. This Europ
8、ean 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 to the CEN Management Centre has the same status as the official versions. CEN members are the nat
9、ional standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and
10、 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 70
11、3:2007: E Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 703:2007) has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)“ in collaboration wi
12、th Technical Committee CEN/TC 188 “Conveyor belts“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2007, and conflicting national standards shall
13、 be withdrawn at the latest by December 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germa
14、ny, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 703:2007 has been approved by CEN as EN ISO 703:2007 without any m
15、odifications. EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 703:2007(E) INTERNATIONAL STANDARD ISO 703 Third edition 2007-06-15 Conveyor belts Transverse flexibility (trou
16、ghability) Test method Courroies transporteuses Flexibilit transversale (aptitude la mise en auge) Mthode dessai EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Ba
17、nk University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
18、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, governmental and non-governmental, in liaison with ISO, also take pa
19、rt in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to
20、prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility th
21、at 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. ISO 703 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts. This third
22、edition of ISO 703 cancels and replaces ISO 703-1:1999, of which it constitutes a technical revision. It also incorporates the Technical Corrigendum, ISO 703-1:1999/Cor. 1:2006. EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2
23、007, Uncontrolled Copy, (c) BSI iv Introduction A large number 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 i
24、ts 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 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 m
25、ethod specified in this International Standard will, however, allow an assessment to be made as to whether the troughing characteristics of the conveyor belt are suitable for the intended application. EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul
26、16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Conveyor belts Transverse flexibility (troughability) Test method 1 Scope This International Standard specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method
27、is not suitable or valid for light conveyor belts as described in ISO 21183-11. NOTE The transverse “flexibility” determined by the method described in this International Standard is only indirectly associated with the inverse of flexural modulus as specified in ISO 1782. Nor does it take into consi
28、deration 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 references The following referenced documents are indispensable for the application of this document. For dated re
29、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5831), Conveyor belts with a textile carcass Total belt thickness and thickness of constitutive elements Test methods ISO 18573, Conveyor belts Test
30、 atmospheres and conditioning periods 3 Symbols F vertical deflection in test piece corrected for belt thickness, in millimetres F1 vertical 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 con
31、veyor belt) d thickness of the test piece, in millimetres (see Figure 2). 4 Principle A 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. The transver
32、se 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. 1) To be published. (Revision of ISO 583-1:1999) EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University,
33、Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 5 Apparatus (see Figure 1) 5.1 Two rigid horizontal bars, conveniently supported. The unsupported length of the bars shall be greater than the test length (L). 5.2 Two clamps, to be attached to the ends of the test piece, with suspensi
34、on 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 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
35、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 piece. 5.3 Four steel suspension wires, of equal length, each with adjustable stirrups on both ends for attachment to the horizontal bars and clamps. The a
36、ttachments to the horizontal bars and clamps should not impede the free movement of the adjustable stirrups when maintaining the suspension wires in the vertical during the test. 5.4 Means of measuring the deflection, F1, to the nearest millimetre (see Figure 2). Dimensions in millimetres Key 1 four
37、 steel suspension wires 2 two rigid horizontal bars 3 two clamps 4 plumb line 5 test piece 6 rigid bar to establish datum line Figure 1 Typical apparatus for measuring transverse flexibility (troughability) EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mo
38、n Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 6 Test piece 6.1 Dimensions The 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 installed conveyor belt, when laid flat; c) it
39、s 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, including covers as determined in accordance with ISO 583. 6.2 Conditioning Condition the test pieces in accordance with ISO 18573, using atmosphere A, B
40、 or C, and then carry out the tests immediately after completion of the conditioning period. 7 Procedure Immediately 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 th
41、e thickness (d) of the test piece, in millimetres, in accordance with ISO 583. 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
42、 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. EN ISO 703:2007 Licensed Copy: London South Bank University, London Sou
43、th Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 Key d thickness of test piece F1 vertical deflection 1 datum line Figure 2 Determination of deflection, F1 8 Calculation and expression of results Calculate the value of F from the following equation: F = F1 + 0,5d
44、Express the results of the measurements in the form of F/L. 9 Test report The test report shall contain the following information: a) reference to this International Standard (i.e. ISO 703); b) identification of the conveyor belt tested; c) the test length (L) (see Clause 3); d) the thickness of the
45、 test piece (d) (see 6.1); e) the conditioning atmosphere used (A, B or C); f) the value of ratio F/L; g) the date of the test. EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 Bibliography 1 I
46、SO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications 2 ISO 178, Plastics Determination of flexural properties EN ISO 703:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:16:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN
47、 ISO 703:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Bri
48、tish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity w
49、hile using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addre