BS EN ISO 7622-1-2013 Steel cord conveyor belts Longitudinal traction test Measurement of elongation《钢丝绳芯输送带 纵向牵引力试验 伸长率测量》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7622-1:2013Steel cord conveyor belts Longitudinal traction testPart 1: Measurement of elongation (ISO7622-1:2013)BS EN ISO 7622-1:2013 BRITISH STANDARDNational foreword

2、This British Standard is the UK implementation of EN ISO7622-1:2013. It supersedes BS EN ISO 7622-1:1996 which iswithdrawn.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 reques

3、t to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77348 8ICS 53.040.20Compliance with a British Stan

4、dard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7622-1 May 2013 ICS 53.

5、040.20 Supersedes EN ISO 7622-1:1995English Version Steel cord conveyor belts - Longitudinal traction test - Part 1: Measurement of elongation (ISO 7622-1:2013) Courroies transporteuses cbles dacier - Essai de traction dans le sens longitudinal - Partie 1: Mesurage de lallongement (ISO 7622-1:2013)

6、This European Standard was approved by CEN on 2 April 2013. 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 refere

7、nces 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

8、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, Finland, Former Yugoslav Republic of Macedonia,

9、 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 STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCH

10、ES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7622-1:2013: EBS EN ISO 7622-1:2013EN ISO 7622-1:2013 (E) 3 Foreword This document (EN ISO 7622-1:2

11、013) 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 publicati

12、on of an identical text or by endorsement, at the latest by November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. 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 sh

13、all not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 7622-1:1995. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,

14、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, Slovakia, Slovenia, Spain, Sweden, Switzerland

15、, Turkey and the United Kingdom. Endorsement notice The text of ISO 7622-1:2013 has been approved by CEN as EN ISO 7622-1:2013 without any modification. BS EN ISO 7622-1:2013ISO 7622-1:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13

16、Principle 14 Apparatus . 15 Test specimens 26 Procedure. 27 Expression of results 38 Test report . 3BS EN ISO 7622-1:2013ISO 7622-1:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparin

17、g 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 liai

18、son 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 2.The main task of tec

19、hnical committees is to 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 draw

20、n 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.ISO 7622-1 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Co

21、nveyor belts.This second edition cancels and replaces the first edition (ISO 7622-1:1984), of which it constitutes a minor revision.ISO 7622 consists of the following parts, under the general title Steel cord conveyor belts Longitudinal traction test: Part 1: Measurement of elongation Part 2: Measur

22、ement of tensile strengthiv ISO 2013 All rights reservedBS EN ISO 7622-1:2013ISO 7622-1:2013(E)IntroductionThis test method is intended to verify, by destructive testing, the elongation properties of steel cords constituting the carcass of conveyor belts. As it is a destructive test, it is used only

23、 in the event of litigation or where no certificate of compliance is issued by the cord manufacturer.Differences in elongation can occur between raw steel cords and rubber-coated steel cords. For this reason, the values determined in accordance with this method and the values stated in a certificate

24、 of the cord manufacturer can differ. ISO 2013 All rights reserved vBS EN ISO 7622-1:2013BS EN ISO 7622-1:2013Steel cord conveyor belts Longitudinal traction test Part 1: Measurement of elongation1 ScopeThis part of ISO 7622 specifies a method for the determination of the elongation of steel cords c

25、onstituting the carcass of conveyor belts, when subjected to a force corresponding to 10 % and 60 % of the specified tensile strength.It applies exclusively to conveyor belts with a steel carcass.NOTE A method for the determination of tensile strength is specified in ISO 7622-2.2 Normative reference

26、sThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 185

27、73, Conveyor belts Test atmospheres and conditioning periods3 PrincipleThe traction test is carried out on a steel cord, taken from the carcass of the belt. Determination of the elongation is measured using an extensometer, at 10 % and 60 % of the specified tensile strength, by using, for example, a

28、 dynamometer, the rate of separation of the jaw of which is specified and maintained constant.4 Apparatus4.1 Dynamometric 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;b) it shall be poss

29、ible for the rate of separation of the jaws to be set at 25 mm/min 5 mm/min and be maintained constant;c) the separation between the jaws shall be capable of being at least 250 mm.4.2 Device for holding the test specimen cord, such that it is impossible for the test specimen to slip during the test.

30、Two fixed grooved pulleys of diameter at least either 50 mm or 10 times the cord diameter, d (see Figure 1), constituting the upper and lower holding device, can be used, for example.INTERNATIONAL STANDARD ISO 7622-1:2013(E) ISO 2013 All rights reserved 1BS EN ISO 7622-1:2013ISO 7622-1:2013(E)Figure

31、 1 Device for holding the test specimen cord4.3 Extensometer, accurate to at least 0,01 %.As the elongation of steel cords is generally very low, accurate, but sensitive, extensometers, which could be damaged if the test specimen should break, have to be used. For this reason, the measurement is lim

32、ited to 60 % of the specified tensile strength.It is preferable that an extensometer be able to accommodate the cord rotation which occurs due to its twisted nature.4.4 Device for recording the curve of traction force as a function of elongation, if available.5 Test specimensPrepare four specimens (

33、two S-twist and two Z-twist) as follows:a) take a sample at least 400 mm long from the belt;b) using a knife, cut the compound between the layer of cords and the remainder of the belt;c) then cut the compound so as to isolate the cords from the central part and extract four cords, taking care not to

34、 subject them to any tensile stress;d) strip the rubber coating from the whole cord length or at least from the area at the end of each of these cords that is to be placed in the holding device.6 ProcedureCarry out four tests at least five days after manufacture of the belt.Unless otherwise specifie

35、d, in which case note this fact in the report, carry out the test at 23 C 2 C and at 50 % 5 % relative humidity in accordance with ISO 18573, Atmosphere B.2 ISO 2013 All rights reservedBS EN ISO 7622-1:2013ISO 7622-1:2013(E)Place the ends of the cord on the holding device, as follows:a) fix one end

36、on the upper device;b) fix the other end on the lower device, and apply an initial tractive force equal to 50 times the linear density (mass per metre) of the cord (this is to define the zero point of the registration curve clearly);c) position the two jaws of the extensometer with a separation of b

37、etween 100 mm and 300 mm.Start the dynamometer, with the rate of separation of the jaws maintained constant at 25 mm/min 5 mm/min.Record and note the elongations at 10 % and 60 % of the specified minimum tensile strength of the belt in the number of cords.7 Expression of resultsExpress the elongatio

38、n as a percentage of the initial length.Take as the result the arithmetic mean value of the four measurements made at 10 % and at 60 % of the specified minimum tensile strength.Express the result to the nearest 0,1 %.8 Test reportThe test report shall contain the following information:a) a reference

39、 to this part of ISO 7622, i.e. ISO 7622-1;b) the mean values of elongation at 10 % and 60 % of the specified minimum tensile strength, in accordance with Clause 7;c) any operating details not specified in this part of ISO 7622, or regarded as optional, together with any incidents likely to have inf

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