1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 21179:2013Light conveyor belts Determination of theelectrostatic field generated by a running light conveyor beltBS EN ISO 21179:2013 BRITISH STANDARDNational forewordT
2、his British Standard is the UK implementation ofEN ISO 21179:2013. It supersedes BS EN ISO 21179:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can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
3、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 2013 ISBN 978 0 580 77362 4 ICS 53.040.10 Compliance with a British Sta
4、ndard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2013. Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 21179 Mar
5、ch 2013 ICS 53.040.10 Supersedes EN ISO 21179:2006English Version Light conveyor belts - Determination of the electrostatic field generated by a running light conveyor belt (ISO 21179:2013) Courroies transporteuses lgres - Dtermination du champ lectrostatique engendr par une courroie transporteuse l
6、gre en marche (ISO 21179:2013) This European Standard was approved by CEN on 2 March 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 l
7、ists 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 und
8、er 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
9、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 STANDARDIZATION COMIT EUR
10、OPEN DE NORMALISATION EUROPISCHES 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 21179:2013: EBS EN ISO 21179:2013EN ISO 21179:2013 (E) 3 Foreword Th
11、is document (EN ISO 21179:2013) 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 st
12、andard, either by publication of an identical text or by endorsement, at the latest by September 2013, and conflicting national standards shall be withdrawn at the latest by September 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
13、rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 21179:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European
14、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, Slovakia, Slovenia
15、, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 21179:2013 has been approved by CEN as EN ISO 21179:2013 without any modification. BS EN ISO 21179:2013ISO 21179:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative refe
16、rences 13 Principle 14 Apparatus (see Figure 1) 14.1 Pair of pulleys, as follows: . 15 Test piece 25.1 Material . 25.2 Dimension . 25.3 Endless joining 25.4 Conditioning 26 Procedure. 37 Expression of results 58 Test report . 5Bibliography 6BS EN ISO 21179:2013ISO 21179:2013(E)ForewordISO (the Inter
17、national 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 subject for which a technical committee has
18、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 (IEC) on all matters of electrotechnical st
19、andardization.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 Standards adopted by the technical committees are circulated to the member bodies fo
20、r 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 subject of patent rights. ISO shall not be held responsible for identifying any or all
21、 such patent rights.ISO 21179 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This second edition cancels and replaces the first edition (ISO 21179:2005), of which it constitutes a minor revision.iv ISO 2013 All rights reserved
22、BS EN ISO 21179:2013INTERNATIONAL STANDARD ISO 21179:2013(E)Light conveyor belts Determination of the electrostatic field generated by a running light conveyor belt1 ScopeThis International Standard specifies a test method for the determination of the electrostatic field generated by a running light
23、 conveyor belt according to ISO 21183-1.This dynamic procedure is required because the antistatic behaviour of light conveyor belts cannot in many cases be sufficiently described by measurement of the electrical resistances in accordance with ISO 21178.2 Normative referencesThe following documents,
24、in whole or in part, are normatively referenced in this document and are indispensable to its application. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 22, Belt drives Flat transmission belts and corresponding pulleys Dimensions and tol
25、erancesISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parametersISO 18573, Conveyor belts Test atmospheres and conditioning periodsISO 21181, Light conveyor belts Determination of the relaxed elastic modulus3 PrincipleThe tes
26、t piece is run under specified conditions and produces an electrostatic field, the variation of which is recorded with time.The test is carried out successively with both sides of the belt in contact with the pulleys.4 Apparatus (see Figure 1)4.1 Pair of pulleys, as follows:a) electrically connected
27、 and earthed;b) made of steel;c) diameter 200 mm or larger, rim width 120 mm;d) raw, unplated surface roughness, maximum Ra = 1,6 m, in accordance with ISO 4287;e) final coating of chromium plating;f) drive pulley, fixed, cylindrical;g) driven pulley moveable for tensioning, crowned in accordance wi
28、th ISO 22 (h = 0,6 mm).4.2 Tensioning device, such that the test piece can be loaded according to the relevant k1 %value given in Table 1 to achieve uniform surface pressures. ISO 2013 All rights reserved 1BS EN ISO 21179:2013ISO 21179:2013(E)Table 1 Shaft load requiredModulus of elasticity k1 %aN/m
29、mShaft load F Nk1 % 2,5 502,5 30 As per agreementaThe value of k1 %shall be established in accordance with ISO 21181.4.3 Drive, such that the belt runs directly from the drive pulley to the measuring device at a speed of 5 m/s.4.4 Measuring device, either an electrostatic field meter with signal out
30、put that gives readings of the electrostatic field strength, E, in volts per metre, or a device that gives a direct reading of the surface potential, U, in volts.4.5 Recording device, e.g. y/t recorder.4.6 Means of correction for electrostatic fields4.6.1 Earthed steel plate equipping the electrode,
31、 200 mm 200 mm, with the edges bent up with a radius of approximately 10 mm, to correct field distortion created by the measuring electrode. The lower surface of the electrode shall be flush with the lower surface of the steel plate. The size and shape of the perforation of the steel plate shall be
32、adapted to the shape of the electrode used. The gap between the electrode and the steel plate shall not exceed 2 mm (see Figure 1).4.6.2 Earthed steel plate, 600 mm 200 mm, with the edges bent up with a radius of approximately 10 mm (see Figure 1), to shield the field to be measured from the field d
33、istortion generated by the return side of the test piece.5 Test piece5.1 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.5.2 DimensionThe test piece shall have an
34、endless length of (2 500 50) mm and a width of (100 1) mm.5.3 Endless joiningThe test piece shall be joined endlessly according to the manufacturers instructions.5.4 ConditioningBefore testing, condition the test pieces in accordance with ISO 18573, Atmosphere B, for 24 h, except that for high-condu
35、ctivity belts, the relative humidity may be reduced to (25 5) %.2 ISO 2013 All rights reservedBS EN ISO 21179:2013ISO 21179:2013(E)6 ProcedureTest conveyor belts which, due to their construction, require pulley diameters of more than 200 mm, with the smallest diameter possible and according to the m
36、anufacturers instructions.Measure the temperature and relative humidity in the test room.Clean both pulleys (4.1) and, if necessary, remove any dust from the shielding steel plates (4.6.1 and 4.6.2).After endlessly joining and conditioning of the test piece, install it on the testing apparatus with
37、the normal running side in contact with the pulleys.Tension the test piece in accordance with 4.2.Install the recording device (4.5).Position the measuring device (4.4) on the centre line of the test piece, 500 mm from the centre of the drive pulley, with a distance of 10 mm to 100 mm between the me
38、asuring device and the test piece surface not in contact with the pulley (see Figure 1).NOTE Experience has shown that a distance of 25 mm is preferable.Start the test piece and run it from the drive pulley (4.3) directly to the field measuring device.Either record the electrostatic field strength,
39、E, in volts per metre or, if the measuring device used gives a direct reading of the surface potential, U, record that value, in volts.The measurement time shall be 30 min.Repeat the same procedure with the other side of the belt in contact with the pulleys. ISO 2013 All rights reserved 3BS EN ISO 2
40、1179:2013ISO 21179:2013(E)Dimensions in millimetresKey1 measuring device with electrode2 driven pulley, movable, crowned3 test piece, endless (2 500 50) mm (100 1) mm4 earthed steel plate, 600 mm 200 mm5 earthed steel plate, 200 mm 200 mm6 drive pulley, fixed, cylindricalaDiameter 200 mm or larger;
41、see Clause 6.bMeasuring distance of test piece surface not in contact with pulleys shall be between 10 mm and 100 mm.cDirection of run.Figure 1 Basic arrangement of test bench for measurement of electrostatic field strength generated by running light conveyor belt4 ISO 2013 All rights reservedBS EN
42、ISO 21179:2013ISO 21179:2013(E)7 Expression of resultsThe two significant results within the test period shall be, firstly, the maximum value reached and, secondly, a value judged to be constant (i.e. when a change over the final 10 min is less than 10 %). Either the two values of these electrostati
43、c field strengths shall be recorded or, if the measuring device used gives a direct reading of the surface potential, the two values of these surface potentials shall be recorded.If the electrostatic field strengths are recorded, the surface potential, U, in volts, shall be calculated using the foll
44、owing formula:UEa= where a is the distance, in metres, between the measuring electrode and the conveyor belt surface.These results are valid for virgin material according to 5.1.If more than one measurement on one side is carried out (several measurements on one test piece or several test pieces), t
45、he arithmetic mean of the individual values either of E (calculated) or U (direct reading) shall be taken. All of the values shall be recorded.8 Test reportThe test report shall include the following information:a) complete designation of the tested conveyor belt material and date of manufacture;b)
46、k1 %value of the test piece(s);c) reference to this International Standard, i.e ISO 21179, and any necessary exceptions;d) places from which the test piece(s) were taken;e) test room temperature and relative humidity;f) conditioning period;g) the shaft load, in newtons;h) indication of belt side in
47、contact with the pulleys;i) the values of U in accordance with Clause 7;j) date of test. ISO 2013 All rights reserved 5BS EN ISO 21179:2013ISO 21179:2013(E)Bibliography1 ISO 21178, Light conveyor belts Determination of electrical resistances2 ISO 21183-1, Light conveyor belts Part 1: Principal chara
48、cteristics and applications6 ISO 2013 All rights reservedBS EN ISO 21179:2013This 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 prese
49、nts 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 Institution (BSI)raising standards worldwideBSI389 Chiswick High Road London W4 4AL UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards and PASs are periodically updated by amendment or revision. Users of British Standards and PASs
