BS EN ISO 21182-2013 Light conveyor belts Determination of the coefficient of friction《轻型输送带 摩擦系数的测定》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 21182:2013Light conveyor belts Determination of the coefficient of frictionBS EN ISO 21182:2013 BRITISH STANDARDNational forewordThis British Standard is the UK impleme

2、ntation of EN ISO21182:2013. It supersedes BS EN ISO 21182:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can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

3、 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 77365 5ICS 53.040.10Compliance with a British Standard cannot confer immunity fromlegal ob

4、ligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 21182 February 2013 ICS 53.040.10 Supersedes EN ISO 21182:200

5、6English Version Light conveyor belts - Determination of the coefficient of friction (ISO 21182:2013) Courroies transporteuses lgres - Dtermination du coefficient de frottement (ISO 21182:2013) This European Standard was approved by CEN on 12 February 2013. CEN members are bound to comply with the C

6、EN/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 standards may be obtained on application to the CEN-CENELEC Management C

7、entre 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 notified to the CEN-CENELEC Management Centre has the same status as

8、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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Neth

9、erlands, 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 Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of expl

10、oitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 21182:2013: EBS EN ISO 21182:2013EN ISO 21182:2013 (E) 3 Foreword This document (EN ISO 21182:2013) has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)“ in collab

11、oration 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 publication of an identical text or by endorsement, at the latest by August 2013, and conflicting national standard

12、s shall be withdrawn at the latest by August 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 shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 211

13、82:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Fr

14、ance, 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 The text of ISO 21182:2013 has been approved by CEN as EN I

15、SO 21182:2013 without any modification. BS EN ISO 21182:2013ISO 21182:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 24.1 Dynamic coefficient of friction 24.2 Static coefficient of friction 25 Ap

16、paratus (see Figure 2) . 26 Test piece 36.1 Test piece material . 36.2 Number and dimensions of test pieces 36.3 Conditioning 47 Procedure. 68 Calculation and expression of results . 68.1 Dynamic friction, D68.2 Static friction S.78.3 Examples for recorded graph of S(force/path diagrams) 79 Test rep

17、ort . 9Bibliography .10BS EN ISO 21182:2013ISO 21182:2013(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 committ

18、ees. 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 Int

19、ernational 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 technical committees is to prepare International Standards. Draft International St

20、andards 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 document may be the subj

21、ect of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 21182 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 1724:1998, prepared by C

22、EN/TC 188.This second edition cancels and replaces the first edition (ISO 21182:2005), of which it constitutes a minor revision.iv ISO 2013 All rights reservedBS EN ISO 21182:2013ISO 21182:2013(E)IntroductionThe coefficient of friction of light conveyor belts has to be seen from two different aspect

23、s relevant to the choice of the reference material. One aspect is the friction of the underside of the belt. In practice, this is not critical because it is low. Regardless of whether a table of steel or of wood is used, the coefficient of friction is within the range from 0,2 to 0,3 in most cases.C

24、ontrary to this, the top face covers show values over an extended range dependent on their actual function. To achieve this function, the material itself can be modified as well as the surface pattern but the test procedure is the same in every case. So it becomes clear that the chosen steel panel r

25、epresents a compromise. Its main properties are reproducibility of the surface finish and uncritical friction behaviour against any kind of belt cover.This International Standard allows comparison of all kinds of conveyor belt to obtain reliable results as a reference. This can be helpful to buyers

26、who need guidance in choosing the right belt for their particular application.The tests in accordance with this International Standard are limited to dynamic coefficients of friction (D) up to 1,0 and static coefficients of friction (S) up to 1,5. Higher values can show a mixture of friction, adhesi

27、on, deformation and other effects occurring, especially where the surface texture is coarse and is therefore unsuitable for this test.The method using the standardized metallic test panel is intended especially to compare the coefficients of friction of different light conveyor belts. The values rec

28、eived under practice conditions always depend on the frictional partners.To determine these effects, it is possible to choose a different frictional partner instead of the panel if required. This is mentioned in the test report. ISO 2013 All rights reserved vBS EN ISO 21182:2013BS EN ISO 21182:2013L

29、ight conveyor belts Determination of the coefficient of friction1 ScopeThis International Standard specifies test methods for determining the dynamic and static coefficients of friction for light conveyor belts according to ISO 21183-1.2 Normative referencesThe following documents , in whole or in p

30、art, 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 3574, Cold-reduced carbon steel sheet of comm

31、ercial and drawing qualitiesISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parametersISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification an

32、d calibration of the force-measuring systemISO 18573, Conveyor belts Test atmospheres and conditioning periodsISO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1dyn

33、amic coefficient of frictionDcoefficient expressed byDDN=FFwhereFDis the dynamic frictional force, sliding friction;FNis the normal force.3.2static coefficient of frictionScoefficient expressed bySS=FFNwhereINTERNATIONAL STANDARD ISO 21182:2013(E) ISO 2013 All rights reserved 1BS EN ISO 21182:2013IS

34、O 21182:2013(E)FSis the static frictional force, “stiction” (break-away force);FNis the normal force.4 Principle4.1 Dynamic coefficient of frictionA test piece cut from the full thickness of the conveyor belt in the longitudinal or transverse direction is clamped to a table. A metallic test panel su

35、bjected to a given normal force is pulled over the test piece at a defined speed. The Dvalue is then determined by calculation, using the dynamic frictional force, FD, and the normal force (FN).4.2 Static coefficient of frictionA metallic test panel is subjected to a normal force as in 4.1. Addition

36、ally, a pulling force is exerted on the test panel, generated by a pulling mechanism moving at a defined speed. The Svalue is determined by calculation, using the static frictional force, FS, and the normal force (FN).5 Apparatus (see Figure 2) 5.1 Testing table, on to which the test piece shall be

37、clamped.5.2 Metallic test panel (see Figure 3) having the following dimensions: thickness, 0,8 mm; width, (76 0,5) mm; length, 152 mm; testing area, (76 0,5) mm (131,5 0,5) mm = (100 1) cm2.The test panel shall be made of steel, type CR1 in accordance with ISO 3574, with a hardness of between HRB 60

38、 and HRB 70, with a milled surface and surface roughness, Ra, of 0,9 m to 1,3 m in accordance with ISO 4287.Because the surface can change due to the abrasion of the test piece, the metallic test panel should be replaced after a maximum of 50 applications, but after one day of use at the latest.Beca

39、use the test panel is not stainless, it shall be kept in its original pack in a dry place until first used. The personnel handling the panel shall wear clean cotton gloves and touch the panel only at the edges.5.3 Mass, generating a normal force of 50 N 1 N together with the metallic test panel. The

40、 mass shall be made of steel having a density of 7,85 g/cm3and have the following dimensions: length (120 0,2) mm; width (75 0,2) mm; height (71 0,2) mm.2 ISO 2013 All rights reservedBS EN ISO 21182:2013ISO 21182:2013(E)5.4 Device for the measurement of the frictional force5.4.1 Load cell, with a ra

41、nge up to 100 N.The force measuring system shall be in accordance with ISO 7500-1, class of machine 3 or better (e.g. class of machine 2).5.4.2 Recording instrument for recording the signal of the load cell5.5 Pulling mechanism, for example a tensile testing machine, to produce a uniform relative mo

42、tion between test piece and metallic test panel.5.6 Deflection roller, having a diameter of 40 mm to 50 mm and ball bearings to ensure smooth rotation.5.7 Pulling cable, parallel to the sliding surface and with a low elasticity, e.g. steel cable with a diameter of approximately 1 mm.6 Test piece6.1

43、Test piece materialTest piece material shall be new, unused (“virgin”), but shall not be tested sooner than five days after manufacture. It shall be free from contamination and superficial damage.6.2 Number and dimensions of test piecesThree test pieces shall be cut from the full thickness of the co

44、nveyor belt in the longitudinal direction see Figure 1 a) and/or the transverse direction see Figure 1 b).Dimensions in millimetres100100b/2 b/2ba) Distribution of test piece selection in longitudinal direction ISO 2013 All rights reserved 3BS EN ISO 21182:2013ISO 21182:2013(E)100100b/2 b/2b100b) Di

45、stribution of test piece selection in transverse directionKeyb belt widthFigure 1 Distribution of test piece selectionIf both surfaces of the belt are to be tested, additional test pieces shall be taken accordingly.The test pieces shall measure 600 mm long 100 mm wide.Each test piece shall be used o

46、nly once.6.3 ConditioningBefore testing, condition the test pieces in accordance with ISO 18573, Atmosphere B, for at least 24 h.4 ISO 2013 All rights reservedBS EN ISO 21182:2013ISO 21182:2013(E)FD1FS18234567FNKey1 load cell2 deflection roller3 test piece table4 test piece5 metallic test panel6 mas

47、s7 clamp8 pulling cableFigure 2 Friction testing apparatus ISO 2013 All rights reserved 5BS EN ISO 21182:2013ISO 21182:2013(E)Dimensions in millimetres1320,8762010Figure 3 Metallic test panel7 ProcedureThe temperature and relative humidity in the test room shall be in accordance with ISO 18573, Atmo

48、sphere B.Adjust the testing table (5.1) to the horizontal position in the longitudinal and transverse directions.Clamp the test piece to the table.Visually inspect the metallic test panel (5.2) to check that it is free from rust.Connect the pulling cable (5.7) to the panel and place the mass (5.3) o

49、n the panel.If measuring the dynamic coefficient of friction, D, adjust the speed of the pulling mechanism to (1 000 20) mm/min, except that if the maximum speed of the machine is less than 1 000 mm/min, the speed of the pulling may be reduced, but not to below (500 20) mm/min. Ensure that the path of motion is 300 mm.If measuring the static coefficient of friction, S, adjust the speed of the pulling mechanism to (100 10) mm/min. Stop the measurement as soon as the test panel be