BS EN ISO 7622-2-2015 Steel cord conveyor belts Longitudinal traction test Measurement of tensile strength《钢丝绳芯输送带 纵向牵引试验 第2部分 抗拉强度的测量》.pdf

1、BSI Standards PublicationBS EN ISO 7622-2:2015Steel cord conveyor belts Longitudinal traction testPart 2: Measurement of tensile strengthBS EN ISO 7622-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 7622-2:2015.It supersedes BS EN ISO 7622-2:1996 whi

2、ch is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract.

3、Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86177 2ICS 53.040.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority o

4、f theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7622-2 November 2015 ICS 53.040.20 Supersedes EN ISO 7622-2:1995English Version Steel cord conveyor belt

5、s - Longitudinal traction test - Part 2: Measurement of tensile strength (ISO 7622-2:2015) Courroies transporteuses cbles dacier - Essai de traction dans le sens longitudinal - Partie 2: Mesurage de la rsistance la rupture (ISO 7622-2:2015) Stahlseilfrdergurte - Zugversuch in Lngsrichtung - Teil 2:

6、Messung der Zugfestigkeit (ISO 7622-2:2015) This European Standard was approved by CEN on 31 October 2015. 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 alterati

7、on. Up-to-date lists and bibliographical references 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

8、 translation under the responsibility of a CEN member 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,

9、Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDI

10、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7622-2:2015 EBS EN ISO 7622-2:2015EN ISO

11、 7622-2:2015 (E) 3 European foreword This document (EN ISO 7622-2:2015) has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)” in collaboration with Technical CEN/TC 188 “Conveyor belts” the secretariat of which is held by SNV. This European Standard shall be giv

12、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. Attention is drawn to the possibility that some of the elements of this document may be the

13、subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 7622-2:1995. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imple

14、ment this European Standard: Austria, Belgium, Bulgaria, 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,

15、 Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7622-2:2015 has been approved by CEN as EN ISO 7622-2:2015 without any modification. BS EN ISO 7622-2:2015ISO 7622-2:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13

16、 Principle 14 Apparatus . 15 Test specimens 25.1 General . 25.2 Test specimen, type A 25.3 Test specimen, type B 35.4 Test specimen, type C 46 Conditioning of test specimens . 47 Procedure. 48 Expression of results 59 Test report . 5 ISO 2015 All rights reserved iiiContents PageBS EN ISO 7622-2:2015

17、ISO 7622-2:2015(E)ForewordISO (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 subj

18、ect 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 (IE

19、C) on all matters of electrotechnical standardization.The procedures used 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 n

20、oted. This document was drafted in accordance with the editorial rules of 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 identifyin

21、g any or all such patent rights. Details of any patent rights identified 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 o

22、f users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supple

23、mentary information.The committee responsible for this document is ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This second edition cancels and replaces the first edition (ISO 7622-2:1984), of which it constitutes a minor revision.ISO 7622 consists of the foll

24、owing parts, under the general title Steel cord conveyor belts Longitudinal traction test: Part 1: Measurement of elongation Part 2: Measurement of tensile strengthiv ISO 2015 All rights reservedBS EN ISO 7622-2:2015ISO 7622-2:2015(E)IntroductionThis test method is intended to verify, by destructive

25、 testing, the tensile strength of steel cords constituting the carcass of conveyor belts. As it is a destructive test, it is used only in the event of litigation or where no certificate of compliance is issued by the cord manufacturer. ISO 2015 All rights reserved vBS EN ISO 7622-2:2015BS EN ISO 762

26、2-2:2015Steel cord conveyor belts Longitudinal traction test Part 2: Measurement of tensile strength1 ScopeThis part of ISO 7622 specifies a method for the determination of the tensile strength, in the longitudinal, of steel cords constituting the carcass of conveyor belts.It applies exclusively to

27、conveyor belts with a steel carcass.NOTE A method for the determination of elongation is specified in ISO 7622-1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the e

28、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 18573, Conveyor belts Test atmospheres and conditioning periods3 PrincipleThe traction test for breaking a test specimen is prepared in such a way that only one of the w

29、arp cords is under stress.4 ApparatusDynamometric tensile testing machine, complying with the following requirements.a) The force exerted by the machine shall be adaptable to the strength of the test specimen. The testing machine capacity shall be such that the maximum testing load is 15 % to 85 % o

30、f the capacity of the machine.b) The rate of separation of the jaws shall be capable of being set at (100 10) mm/min and shall be capable of being maintained constant.c) The separation between the jaws shall be capable of being set at least 250 mm.d) The form of the jaws shall be such that the test

31、specimen is held perfectly and all possibility of slipping during the test is eliminated. For this purpose, cross-ribbed jaws (see Figure 1), with the length of the ribbed part at least 80 mm, are recommended. A small amount of slippage is allowed for rubber elongation.INTERNATIONAL STANDARD ISO 762

32、2-2:2015(E) ISO 2015 All rights reserved 1BS EN ISO 7622-2:2015ISO 7622-2:2015(E)1min. 80 mmKey1 detail of ribbingFigure 1 Jaws5 Test specimens5.1 GeneralCut three test specimens of the following dimensions.a) Length (in the longitudinal direction of the belt): length shall be given as in Table 1.Ta

33、ble 1 Cord diameter and lengthDimensions in millimetresCord diameter Length0 to 3,9 5004,0 to 5,9 7006,0 to 8,4 9008,5 to 10,4 1 20010,5 to 13,0 1 40013,1 to 15,0 1 500b) Width: such that the test specimen contains five warp cords.c) Thickness: that of the belt, including both covers (the ends may b

34、e buffed so that they are held more securely in the jaws). If the belt is too thick to be gripped in the jaws, some part of the cover can be cut off.d) Test specimens shall be cut parallel to the axis of the belt and at least 50 mm from the belt edge.e) Three types of test specimen (A, B, and C) may

35、 be used.5.2 Test specimen, type APrepare the test specimen type A shown in Figure 2 as follows.a) Remove the covers and weft, if any, along 50 mm in the centre of the sample, so that the five warp cords are laid bare on both sides.2 ISO 2015 All rights reservedBS EN ISO 7622-2:2015ISO 7622-2:2015(E

36、)b) Using, for example, shears, cut the four cords on either side of the centre cord (take care not to damage the latter).c) Using a knife, isolate the centre cord and its covering by cutting the compound parallel to this cord.Dimensions in millimetresL12350Key1 warp cords2 test specimen width3 test

37、 specimen thicknessL length of test specimenFigure 2 Test specimen type A5.3 Test specimen, type BPrepare the test specimen type B shown in Figure 3 as follows.a) Remove the two outer cords over a length of 150 mm.b) Remove the two cords on either side of the centre cord over a minimum length of 50

38、mm, taking the precautions cited in 5.2.Dimensions in millimetresL50150KeyL length of test specimenFigure 3 Test specimen type B ISO 2015 All rights reserved 3BS EN ISO 7622-2:2015ISO 7622-2:2015(E)5.4 Test specimen, type CPrepare the test specimen type C shown in Figure 4 as follows.a) Using, for e

39、xample, shears, cut the four cords on either side of the centre cord (take care not to damage the latter).Dimensions in millimetres150 5LKey1 cutting points across the warp cordsL length of test specimenFigure 4 Test specimen type C6 Conditioning of test specimensCondition the test specimens in acco

40、rdance with ISO 18573, using atmosphere A or B, and carry out the tests immediately after completion of the conditioning period.7 ProcedureThe procedure shall be as follows.a) Place the ends of the test specimen (approximately 100 mm on either side) between the jaws. The five cords shall all be grip

41、ped. If the jaws have self-tightening corners, check that the various parts of these jaws move freely and smoothly.b) Also check that the test specimen is correctly positioned in relation to the traction plane.c) Start the dynamometer, with the rate of separation of the jaws maintained constant at (

42、100 10) mm/min.d) Note the tractive force at the moment of breaking.4 ISO 2015 All rights reservedBS EN ISO 7622-2:2015ISO 7622-2:2015(E)8 Expression of resultsThe tensile strength, R, of the belt in the longitudinal direction, expressed in newtons per millimetre, is calculated by Formula (1):RFCb=(

43、1)whereF is the mean value of the tensile breaking force, in newtons, given by Formula (2):FFFF=+1233(2)whereF1, F2, and F3are the tractive forces, at the moment of breaking, of the three test specimens, in newtons;C is the number of warp cords in the belt;b is the nominal width of the belt, in mill

44、imetres.The result of the calculation is the maximum theoretical value for the belt tested, not the effective tensile strength of this belt, which will be lower. The effective tensile strength can be determined by using a corrective term taking into account the combined action between the cords in t

45、he belt.9 Test reportThe test report shall include the following information:a) reference to this part of ISO 7622, i.e. ISO 76222;b) identification of the belt tested;c) type of test specimen used;d) temperature and relative humidity during the test;e) mean value, F, of the tensile breaking force,

46、together with the individual values for each test specimen;f) tensile strength, R, calculated in accordance with Clause 8;g) any operating details not specified in this part of ISO 7622, or regarded as optional, together with any incidents likely to have influenced the results. ISO 2015 All rights reserved 5This page deliberately left blank