1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Steel cord conveyor belts Methods for the determination of total thickness and cover thickness (ISO 7590:2018)BS EN ISO 7590:2018National forewordThis British Standard is the UK implementation of EN ISO 7590:2018. It su
2、persedes BS EN ISO 7590:2009, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts.A list of organizations represented on this committee can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
3、necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 92947 2ICS 53.040.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standa
4、rd was published under the authority of the Standards Policy and Strategy Committee on 31 July 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 7590:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 7590July 2018ICS 53.040.20 Supersedes EN ISO 75
5、90:2009EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 7590:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national M
6、embersSteel cord conveyor belts - Methods for the determination of total thickness and cover thickness (ISO 7590:2018)Courroies transporteuses cbles dacier - Mthodes de dtermination de lpaisseur totale et de lpaisseur des revtements (ISO 7590:2018)Stahlseil-Frdergurte - Messung der Gesamtdicke und d
7、er Deckplattendicke (ISO 7590:2018)This European Standard was approved by CEN on 30 May 2018.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
8、 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 translation un
9、der 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, Finland, Former
10、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, Switzerland, Turkey and United Kingdom.English VersionEN ISO 7590:2018 (E)Europe
11、an forewordThis document (EN ISO 7590:2018) 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
12、national standard, either by publication of an identical text or by endorsement, at the latest by January 2019, and conflicting national standards shall be withdrawn at the latest by January 2019.Attention is drawn to the possibility that some of the elements of this document may be the subject of p
13、atent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN ISO 7590:2009.According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Au
14、stria, 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, Serbia, Slovakia, Slovenia, Sp
15、ain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 7590:2018 has been approved by CEN as EN ISO 7590:2018 without any modification.iiBS EN ISO 7590:2018ISO 7590:2018Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatu
16、s . 25.1 Dial gauge micrometer for methods A1 and A2 . 25.2 Optical measuring instrument for method B 26 Procedure. 26.1 General . 26.2 Measurement points 26.3 Test pieces and test specimens . 26.3.1 General 26.3.2 Test pieces and test specimens for method A1 36.3.3 Test specimens for method A2 . 36
17、.3.4 Test specimens for method B 36.4 Measurement of thickness 36.4.1 Method A1 . 36.4.2 Method A2 . 46.4.3 Method B . 57 Test report . 5Bibliography 7 ISO 2018 All rights reserved iiiContents PageBS EN ISO 7590:2018ISO 7590:2018ForewordISO (the International Organization for Standardization) is a w
18、orldwide 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
19、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 to develop thi
20、s 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 the ISO/IEC Di
21、rectives, 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 identified during the deve
22、lopment 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 the voluntary natu
23、re of standards, 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.This documen
24、t was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This sixth edition cancels and replaces the fifth edition (ISO 7590:2009), which has been technically revised. The main change compared to the previous edition is as follows: Fi
25、gure 4 has been corrected.iv ISO 2018 All rights reservedBS EN ISO 7590:2018Steel cord conveyor belts Methods for the determination of total thickness and cover thickness1 ScopeThis document specifies three methods for the measurement of total belt thickness and the thickness of covers of steel cord
26、 conveyor belts.Methods A1 and A2 (micrometer methods) can be used for all steel cord conveyor belts for the measurement of both total belt thickness and cover thickness.Method B (optical method) is intended for the measurement of cover thickness only. It is not suitable if there is a textile or met
27、al weft, nor if the ends of the steel cords become twisted when cut.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in st
28、andardization at the following addresses: ISO Online browsing platform: available at https:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/3.1breakertransverse reinforcement in the conveyor belt, typically of a textile material, inserted both above and below or either abov
29、e or below the steel cords at a distance of at least 1 mm and considered to be part of the coverNote 1 to entry: It is used to protect the longitudinal cords from impact or trapped material damage.3.2wefttransverse component of a protective reinforcement of either steel or textile cords, typically i
30、nserted both above and below, or either above or below, the steel cords at a distance of less than 1 mm and considered to be part of the belt carcass4 PrincipleThe total thickness is measured using a micrometer at a number of specified points depending on belt width.The cover thicknesses are measure
31、d either:a) by removing the covers, taking further measurements at the same specified points and calculatingeach of the cover thicknesses by subtraction; orb) by direct measurement using an optical measuring instrument.INTERNATIONAL STANDARD ISO 7590:2018 ISO 2018 All rights reserved 1BS EN ISO 7590
32、:2018ISO 7590:20185 Apparatus5.1 Dial gauge micrometer for methods A1 and A2The instrument shall be graduated every 0,1 mm with flat feet and a circular foot 10 mm in diameter that exerts a pressure of (22 5) kPa on the test specimen.5.2 Optical measuring instrument for method BThe instrument shall
33、comprise a hand-held magnifying glass with a scale divided in 0,1 mm steps. The magnification shall be at least 8 times.6 Procedure6.1 GeneralIf the adhesion strength between cover and core layer is being measured in accordance with ISO 8094, the same test pieces may be used for the determination of
34、 cover thickness described in method A1.If the position of the steel cord is being measured in accordance with EN 13827, the same test piece may be used for the determination of cover thickness described in method A2.If the use of methods A1 and A2 is impractical, the visible belt end or the end of
35、a laboratory sample of the belt may be used for the determination of cover thickness described in method B.6.2 Measurement pointsIf the belt width is less than or equal to 1 000 mm, measure the thickness at three points spaced equidistantly over the belt width see Figure 1 a).If the belt width is gr
36、eater than 1 000 mm, measure the thickness at five points spaced equidistantly over the belt width see Figure 1 b).a) Belt width 1 000 mmb) Belt width 1 000 mmFigure 1 Location of measurement points6.3 Test pieces and test specimens6.3.1 GeneralCut a rectangular test piece across the full belt width
37、, at 90 to the belt edge, having dimensions as specified in 6.3.2 to 6.3.4, as appropriate.2 ISO 2018 All rights reservedBS EN ISO 7590:2018ISO 7590:20186.3.2 Test pieces and test specimens for method A1The test piece shall be approximately 150 mm long. Cut three or five, as appropriate, test specim
38、ens from the test piece at the measurement points specified in 6.2. Each test specimen shall be two cord pitches wide, i.e. having a width equal to the width that comprises two cords (see Figure 2), and shall have a length of approximately 150 mm.Dimensions in millimetresKey1 measurement point2 test
39、 specimenFigure 2 Test specimens taken at the measurement points and cut from a full width belt sample6.3.3 Test specimens for method A2The test specimen shall be not less than 50 mm long with a width equal to the total width of the belt. Mark on the test specimen the measurement points specified in
40、 6.2.6.3.4 Test specimens for method BThe test shall be carried out either on the end of the conveyor belt in situ, or on a test specimen not less than 50 mm long. In either case, the cut edge shall be at 90 to the surface of the belt and the cords shall be visible and free from contamination, the c
41、ord ends being cleaned, if necessary. Mark on the test specimen the measurement points specified in 6.2.6.4 Measurement of thickness6.4.1 Method A16.4.1.1 Measurement of total thicknessMeasure the total thickness, s1, of the test specimen at each of the measurement points specified in 6.2.6.4.1.2 Me
42、asurement of top cover thicknessRemove the top cover down to the two cords (see Figure 3). Measure the dimension s4at the measurement points shown in Figure 1. Take measurements directly above the cord, ensuring that the micrometer foot is in contact with either the surface of the cord see Figure 3
43、a) or the surface of the weft see Figure 3 b). ISO 2018 All rights reserved 3BS EN ISO 7590:2018ISO 7590:2018Calculate the thickness of the top cover, s2, at each measurement point using Formula (1).S2= S1 S4(1)a) Cross-section of a test specimen without weft, with or without breakerb) Cross-section
44、 of a test specimen with weftKey1 weftFigure 3 Test specimens for method A16.4.1.3 Measurement of bottom cover thicknessAfter carrying out the procedure described in 6.4.1.2, remove the bottom cover. Measure the dimension s5as described in 6.4.1.2, ensuring that the measurement points are located ov
45、er the cords.Calculate the thickness of the bottom cover, s3, at each measurement point using Formula (2).S3= S4 S5(2)6.4.1.4 Calculation and expression of resultsCalculate the arithmetic mean of three or five thicknesses, as appropriate, for s1, s2and s3, as determined in 6.4.1.1, 6.4.1.2 and 6.4.1
46、.3. Express the results in millimetres.6.4.2 Method A26.4.2.1 Measurement of total thicknessMeasure the total thickness, s1, of the test specimen at each of the measurement points specified in 6.2.6.4.2.2 Measurement of top cover thicknessRemove a section of the top cover 20 mm in length over the en
47、tire width of the test specimen (see Figure 4). Measure the thickness, s4, at the same points as in 6.4.2.1. Take measurements directly above the cord, ensuring that the micrometer foot is in contact with either the surface of the cord see Figure 4 a) or the surface of the weft see Figure 4 b).Calcu
48、late the thickness of the top cover, s2, at each measurement point, using Formula (1).6.4.2.3 Measurement of bottom cover thicknessAfter carrying out the procedure described in 6.4.2.2, remove the bottom cover. Measure the dimension s5as described in 6.4.2.2, ensuring that the measurement points are
49、 located over the cords.4 ISO 2018 All rights reservedBS EN ISO 7590:2018ISO 7590:2018Calculate the thickness of the bottom cover, s3, at each measurement point, using Formula (2).Dimensions in millimetresa) Cross-section of a test specimen without weft, with or without breakerb) Cross-section of a test specimen with weftKey1 breaker2 weft3 cordFigure 4 Test specimens for method A26.4.2.4 Calculation and expression of resultsCalculate the arithmetic mean of three or five thicknesses, as appropriate, for s1, s2and
