1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 21180:2013Light conveyor belts Determination of the maximum tensile strengthBS EN ISO 21180:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implem
2、entation of EN ISO 21180:2013. It supersedes BS EN ISO 21180:2006, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e P R I / 6 7 , C o n v e y o r b e l t s .A list of organizations represented on this committee can be obtained on request
3、 to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013.ISBN 978 0 580 77363 1 ICS 53.040.10 Compliance with a British
4、 Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2013.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 21180
5、 February 2013 ICS 53.040.20 Supersedes EN ISO 21180:2006English Version Light conveyor belts - Determination of the maximum tensile strength (ISO 21180:2013) Courrroies transporteuses lgres - Dtermination de la rsistance maximale la traction (ISO 21180:2013) This European Standard was approved by C
6、EN on 12 February 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 references concerning such national standa
7、rds 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 member into its own language and not
8、ified 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, France, Germany, Greece, Hungary, I
9、celand, 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 EUROPISCHES KOMITEE FR NORMUNG Management Cen
10、tre: 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 21180:2013: EBS EN ISO 21180:2013 EN ISO 21180:2013 (E) 3 Foreword This document (EN ISO 21180:2013) has been prepared by Technical Com
11、mittee ISO/TC 41 “Pulleys andbelts (including veebelts)“ in collaboration with Technical Committee CEN/TC 188 “Conveyor belts” thesecretariat of which is held by SNV. This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement,
12、 at the latest by August 2013, and conflicting national standards shall be withdrawn atthe latest by August 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. CEN and/or CENELEC shall not be held responsible for identifying any
13、or all such patent rights. This document supersedes EN ISO 21180:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, CzechRepublic, Denmark,
14、 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, Turkey and the United Kingdom. Endorsement notice T
15、he text of ISO 21180:2013 has been approved by CEN as EN ISO 21180:2013 without any modification. BS EN ISO 21180:2013ISO 21180:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 25 Principle 36 Apparatus . 37 Test
16、pieces . 37.1 Shape and dimensions 37.2 Number and selection . 37.3 Conditioning 47.4 Preparation 48 Procedure. 49 Calculation and expression of results . 410 Test report . 5Bibliography 6BS EN ISO 21180:2013ISO 21180:2013(E)ForewordISO (the International Organization for Standardization) is a world
17、wide 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 t
18、hat 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
19、accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical 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 re
20、quires approval by at least 75 % of the member bodies casting a vote.ISO 21180 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This International Standard is based on EN 1722:1999, prepared by CEN/TC 188.This second edition can
21、cels and replaces the first edition (ISO 21180:2005), of which it constitutes a minor revision.iv ISO 2013 All rights reservedBS EN ISO 21180:2013INTERNATIONAL STANDARD ISO 21180:2013(E)Light conveyor belts Determination of the maximum tensile strength1 ScopeThis International Standard specifies a t
22、est method for the determination of the maximum tensile strength of light conveyor belts, according to ISO 21183-1, or of other conveyor belts where ISO 283 is not applicable.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indis
23、pensable 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 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression tes
24、ting machines Verification and calibration of the force-measuring systemISO 18573, Conveyor belts Test atmospheres and conditioning periods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1tensile loadforce per unit of belt width, expressed in new
25、tons per millimetreNote 1 to entry: In light conveyor belt technology, the definition of tensile load deviates from that commonly used. It is measured in force per unit of belt width, in newtons per millimetre, while normally it is defined as a stress, i.e. a force per unit of cross section, in newt
26、ons per square millimetre.Note 2 to entry: In light conveyor belt technology, the symbol for the tensile load is k and the maximum tensile strength is designated as kmax, expressed in newtons per millimetre.Note 3 to entry: In EN 10002-1:2001, the symbol k is used to represent the coefficient of pro
27、portionality. ISO 2013 All rights reserved 1BS EN ISO 21180:2013ISO 21180:2013(E)4 SymbolsThe following symbols are used in this document (see also Figure 1):Fbreak is the tensile force in the test piece at break, in newtons;Fmaxis the maximum tensile force in the test piece, in newtons;kmaxis the v
28、alue of Fmaxdivided by the width, in millimetres, of the narrowest part of the test piece at the start of the test;l is the actual increase in length of the test piece between the jaws, in millimetres, during the test;lbreakis the increase in length of the test piece between the jaws, in millimetres
29、, taken at Fbreak;lmaxis the increase in length of the test piece between the jaws, in millimetres, taken at Fmax;lmis the increase in length of the distance between the datum marks (see 7.4), in millime-tres;maxis the value of lmaxor lmdivided by the initial length of the test piece or the initial
30、dis-tance between the datum marks and expressed in percent.NOTE Fmaxand Fbreakcan be the same but are not necessarily so.Y1234 XKeyX elongation of test piece, l (mm)Y tensile force, F (N)1 Fmax2 Fbreak3 lmax4 lbreakFigure 1 Dynamometer graph2 ISO 2013 All rights reservedBS EN ISO 21180:2013ISO 21180
31、:2013(E)5 PrincipleA test piece, cut from the full thickness of the conveyor belt in the longitudinal direction, is tested and the tensile force recorded as a function of the belt elongation. From that graph, the maximum tensile strength is determined by calculation.6 Apparatus6.1 Tensile testing ma
32、chine (dynamometer), capable of applying a load suitable for the maximum tensile strength of the test piece and with a force-measuring system, in accordance with ISO 7500-1, class of machine 3 or better (e.g. class of machine 2).7 Test pieces7.1 Shape and dimensionsThe test pieces shall be cut from
33、the full thickness of the conveyor belt in the longitudinal direction. Their shape and dimensions shall be in accordance with Figure 2. The test pieces shall not be tested sooner than five days after manufacture.Dimensions in millimetresaa220 + (2 length of a jaw).Figure 2 Shape and dimensions of te
34、st pieceFor certain types of belt construction, the shape of the test pieces illustrated in Figure 2 might produce abnormal and unequal stress distributions in the threads, causing systematic slip in the grips, giving misleading results. Under such circumstances, the test may be conducted using test
35、 pieces of a different shape (see, for example, ISO 1421 and ISO 13934-1).7.2 Number and selectionFive test pieces shall be taken in the longitudinal direction of the conveyor belt.The test pieces shall be selected in accordance with Figure 3. ISO 2013 All rights reserved 3BS EN ISO 21180:2013ISO 21
36、180:2013(E)bb/10 b/5 b/5 b/5 b/5 b/10Figure 3 Distribution of test piece selection7.3 ConditioningBefore testing, condition the test pieces in accordance with ISO 18573, Atmosphere B, for 24 h, except that if the light conveyor belt consists of materials with a high absorption of moisture, e.g. cott
37、on or polyamide, condition the test pieces for 48 h.7.4 PreparationOn the longitudinal axis of the test piece, draw two datum marks equidistant from the centre and (100 0,5) mm apart (see Figure 2).8 ProcedurePlace the ends of the test piece between the jaws of the tensile testing machine (6.1) such
38、 that the test piece is straight without using force. Ensure that the free length between the jaws is 220 mm 5 mm and that there is no slippage of the test piece in the jaws during the test.Slippage can be minimized by rubbing rosin on the portion of the test piece that will be in the jaws, removing
39、 any excess rosin and enclosing both sides of the rosin-coated test piece with coarse emery cloth. The emery cloth should be folded over the ends of the test piece with the coarse side of the cloth next to the rosin-coated surfaces.Exert a continuous (uninterrupted) tensile stress on the test piece,
40、 at a rate of (100 10) mm/min.Record the tensile force as a function of the belt elongation. Continue at least until the maximum tensile force Fmaxis reached or, optionally, until breakage occurs. If testing until breakage occurs, observe whether the break occurs between the two datum marks on the t
41、est piece. If any test pieces break outside this central portion or if they slip in the jaws, do not take these results into account when calculating the mean, but repeat the test using new test pieces.9 Calculation and expression of resultsRead the maximum tensile force, Fmax, from the graph, as sh
42、own in Figure 1.4 ISO 2013 All rights reservedBS EN ISO 21180:2013ISO 21180:2013(E)Divide Fmaxby the smallest width of the test piece (25 mm), thus giving the maximum tensile strength kmax:kFmaxmax=25mmN/mm If required, calculate the elongation maxtaking place at Fmaxfrom lm(in millimetres) and reco
43、rd it as a percentage as follows:mmmaxm =l100100% If no measuring device for lm(in millimetres) is available, maxmay also be calculated from lmaxas follows:mmmax =lmax%220100 However, this method has the disadvantage of having the result being influenced by the different widths of the test piece (25
44、 mm to 35 mm) and is only correct if there has been no slippage of the test piece in the jaws of the apparatus.If the test was continued until breakage occurred, kbreakand breakmay analogously be determined from Fbreak.Calculate the individual kmaxvalues of all five test pieces and take the arithmet
45、ical mean of the five values. Use the same procedure for the calculation of max, if required. Determine the values for the breaking conditions in the same way, if applicable.10 Test reportThe test report shall include the following information:a) a complete designation of the tested conveyor belt ma
46、terial and the manufacturing date;b) reference to this International Standard, i.e. ISO 21180;c) test room temperature and relative humidity;d) conditioning period;e) results of the test in accordance with Clause 9;f) date of the test. ISO 2013 All rights reserved 5BS EN ISO 21180:2013ISO 21180:2013
47、(E)Bibliography1 ISO 283, Textile conveyor belts Full thickness tensile strength, elongation at break and elongation at the reference load Test method2 ISO 1421, Rubber- or plastics-coated fabrics Determination of tensile strength and elongation at break3 ISO 13934-1, Textiles Tensile properties of
48、fabrics Part 1: Determination of maximum force and elongation at maximum force using the strip method4 ISO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications5 EN 10002-1:2001, Metallic materials Tensile testing Part 1: Method of test at ambient temperature6 ISO 2013 All
49、 rights reservedBS EN ISO 21180:2013This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services. It presents the UK view on standards in Europe and at the international level. BSI is incorporated by Royal Charter. British Standards and other standardisation products are published by BSI Standards Limited.British Standards
