BS-EN-ISO-703-1-2000.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 703-1:2000 The European Standard EN ISO 703-1:1999 has the status of a British Standard ICS 53.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Conveyor belts Ð Transverse flexibility and troughability Ð Part 1: Test method Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 March 2000 BSI 03-2000 ISBN 0 580 35487 3 BS EN ISO 703-1:2000 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the English language version of EN ISO 703-1:1999. It is identical with EN ISO 703-1:1999. It supersedes BS 490-10.6:1983 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI A Reference number ISO 703-1:1999(E) INTERNATIONAL STANDARD ISO 703-1 First edition 1999-12-15 Conveyor belts Transverse flexibility and troughability Part 1: Test method Courroies transporteuses Flexibilité transversale et aptitude à la mise en auge Partie 1: Méthode d'essai EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI ii Foreword ISO (the International Organization for Standardization) 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 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 that some of the elements of this part of ISO 703 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 703-1 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts. This first edition of ISO 703-1, together with ISO 703-2, cancel and replace ISO 703:1988, of which they constitute a technical revision. ISO 703 consists of the following parts, under the general title Conveyor belts Transverse flexibility and troughability: Part 1: Test method Part 2: Performance requirements EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI iii 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 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 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 this method of test will however allow an assessment to be made as to whether the troughing characteristics of the conveyor belt are suitable for the angle of inclination of the side idler rolls of the installation on which the belt is to be installed. EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DRADNATS LANOITANRETNI )E(9991:1-307 OSI 1 Conveyor belts Transverse flexibility and troughability Part 1: Test method 1 Scope This part of ISO 703 specifies a method for determining the transverse flexibility (in terms of troughing ability) of conveyor belts. This method is not suitable or valid for light conveyor belts as described in EN 873. NOTE The transverse “flexibility“ determined by this method is only indirectly associated with the inverse of flexural modulus as specified in ISO 178, Plastics Determination of flexural properties. Nor does it take account of the differences in “flexibility“ as exhibited by three-point and four-point bending, which takes into account the flexural strain and the thickness of the test piece. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 703. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 703 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 583-1:1), Conveyor belts with a textile carcass Total thickness and thickness of elements Part 1: Methods of test. EN 873, Light conveyor belts Principal characteristics and applications. 3 Symbols F1vertical deflection in the test piece, in millimetres (see Figure 1 and Figure 2) F vertical deflection in the test piece corrected for the belt thickness, in millimetres L length of the test piece when laid flat, in millimetres NOTE It is equivalent to the full width of the installed conveyor belt. e thickness of the test piece, in millimetres (see Figure 2) 1) To be published. (Revision of ISO 583:1990) EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI 2 4 Principle A test piece, consisting of a transverse section of belt (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 troughability (transverse flexibility) is determined by measuring the maximum deflection (F) of the test piece under its own weight. It is expressed as the ratio of F/L. 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, 150 mm long, to be attached to the ends of the test piece, with suspension lugs for attachment to the suspending wires. The clamps shall be sufficiently 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 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. NOTE The attachments 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 1). EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI 3 Dimensions in millimetres Key 1 Four steel suspension wires 2 Two rigid horizontal bars 3 Two clamps each 150 mm long 4 Plumb line 5 Test piece (see 6.1) 6 Datum line Figure 1 Typical apparatus for measuring transverse flexibility (troughability) 6 Test piece 6.1 Preparation Select the test piece at least 16 h after the manufacture of the belt. The test piece shall comply with the following conditions: a) form: rectangular parallel piped (L ¥ 150 mm ¥ e); b) length (L): overall width of the installed conveyor belt, when laid flat, in millimetres; c) width: (in the longitudinal direction of the belt) = 150 mm; d) thickness (e): overall thickness of the conveyor belt in millimetres, including covers as determined in accordance with ISO 583-1. EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI 4 6.2 Conditioning The tests shall start not less than 16 h after manufacturing. This time includes 8 h for conditioning at one of the temperatures specified below: (23 ± 2) °C or (20 ± 2) °C (temperate temperature control only); (27 ± 2) °C (tropical temperature control only). The tests shall be conducted at the same temperature as used for conditioning. A certain humidity for conditioning and testing is not required. The temperature at which the test pieces were conditioned and tested shall be reported in the test report. 7 Procedure Immediately prior to the commencement of 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 (e) of the test piece in millimetres in accordance with ISO 583-1. Fit the test piece, carrying face upper most, while in the flat position, into the suspended clamps. Allow the test piece to fall under its own mass from the flat position into the troughed position. Adjust the apparatus so that the suspending forces act vertically throughout the test period. After 5 min, measure the vertical deflection of the test piece (F1) (see Figure 2) and add to this measurement the dimension 0,5e to give the value for F. Key 1 Datum line Figure 2 Determination of deflection F1 EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(9991:1-307 OSI 5 8 Calculation and expression of results Calculate the value of F from the following equation: F = F1 + 0,5e Express the results of the measurements taken in the form of F L 9 Test report The test report shall contain the following information: a) reference to this part of ISO 703; b) identification of the conveyor belt tested (e.g. type, manufacturer); c) the test length (L) (see clause 3); d) the value of the ratio F/L; e) the thickness of the test piece (e) (see clause 3); f) the conditioning and test temperature (see 6.2); g) date of the test, test centre and signature of tester. EN ISO 703-1:1999 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:14:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 703-1:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð 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 British 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. 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