BS-EN-13827-2003.pdf

BRITISH STANDARD BS EN 13827:2003 Steel cord conveyor belts Determination of the lateral and vertical displacement of steel cords The European Standard EN 13827:2003 has the status of a British Standard ICS 53.040.20 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 13827:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 January 2004 © BSI 9 January 2004 ISBN 0 580 43235 1 National foreword This British Standard is the official English language version of EN 13827:2003. The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 13827 December 2003 ICS 53.040.20 English version Steel cord conveyor belts - Determination of the lateral and vertical displacement of steel cords Courroies transporteuses à carcasse métallique - Détermination du déplacement latéral et vertical des câbles d'acier Stahlseil-Fördergurte - Prüfung der horizontalen und vertikalen Lage der Stahlseile This European Standard was approved by CEN on 3 November 2003. 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 standards may be obtained on application to the Central Secretariat 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13827:2003: E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 2 ContentsPage Foreword. 3 1Scope . 4 2Normative references . 4 3Method A. Determination of cord pitch and supported belt width 4 4Method B. Determination of the vertical displacement of cords relative to a mean level 6 5Test report . 8 Bibliography. 9 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 3 Foreword This document (EN 13827:2003) has been prepared by Technical Committee CEN/TC 188 “Conveyor belts”, the secretariat of which is held by BSI. 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 June 2004, and conflicting national standards shall be withdrawn at the latest by June 2004. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 4 1 Scope This European Standard specifies methods for the determination of the mean lateral displacement between cords, and for the determination of the vertical displacement of cords relative to a mean level of steel cords within a conveyor belt as described in prEN ISO 15236-1. 2 Normative references Not applicable. 3 Method A. Determination of cord pitch and supported belt width 3.1 Apparatus NOTEIf there are other measuring tools with the same or better precision these can also be used. 3.1.1Measuring tape, graduated in divisions of 1,0 mm. 3.1.2Hand held optical magnifier, incorporating a scale graduated in divisions of 0,1 mm and having a magnification of not less than x8. 3.1.3Dial gauge micrometer, graduated in divisions of 0,1 mm. 3.1.4Flat horizontal surface to support the full width of the conveyor belt. 3.2 Test piece The test piece shall be of full belt width and not less than 50 mm long. The cut edges shall be smooth, free of contamination and shall expose the cords clearly. If the cut edges are not smooth enough the test piece can be prepared in a different way so that the position of the cords can be measured with a precision given in this European Standard. 3.3 Procedure 3.3.1Determination of mean cord pitch (tm) Using the measuring tape (3.1.1), measure the distance to the nearest 1,0 mm between the outer edges of the first and last cord across the width of the test piece (see Figure 1), and record this value as (bt + d). Alternatively, use the measuring tape to measure the belt width to the nearest 1,0 mm and measure the thickness of the edge rubber, bk, at both edges to the nearest 0,5 mm; (bt + d) is the belt width less edge rubber thickness. Using the micrometer (3.1.3), or the hand held optical magnifier (3.1.2), measure the diameter of either the first or the last cord in the test piece to the nearest 0,1 mm and record the value as (d). Count the total number of cords across the width of the test piece and record the number as (n). Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 5 Figure 1 Illustration of measurements taken for measurement of tm Calculate the mean cord pitch tm as follows: tm (btd)d (n 1) = + Express the result to the nearest 0,1 mm. 3.3.2 Measurement of supported belt width (bt) (see Figure 1) Calculate the supported belt width bt as follows: bt = (bt + d) d Express the results to the nearest 0,1 mm. Calculate the percentage of the deviation of the actual supported belt width to the calculated supported belt width as follows: %100 1)(n 100 × × = tm bt bt 3.3.3Measurement of the cord pitches within a control section (see Figure 2) Select any 21 consecutively adjacent cords within the test piece. Using the micrometer (3.1.3) or the hand held optical magnifier (3.1.2), measure the pitches between the 21 cords and record them as t1, t2, t20. NOTEIf these requirements cannot be met within this control section, the control section may be increased in multiples of 20 pitches until all pitches are measured. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 6 Figure 2 Illustration of measurements taken of cord pitches in control section 4 Method B. Determination of the vertical displacement of cords relative to a mean level. NOTEThis test can only be conducted on a conveyor belt that has a uniform cover on at least one side. This is because the outer surface of the uniform cover is used as the base datum for measurements of cord height. Variations in the base datum will adversely effect the precision of the test. 4.1 Apparatus NOTEIf there are other measuring tools with the same or better precision these can also be used. 4.1.1A dial gauge micrometer as described in 3.1.3. 4.1.2A hand held optical magnifier as described in 3.1.2. 4.1.3A flat surface as described in 3.1.4. 4.2 Test piece Use the test piece described in 3.2. 4.3 Procedure 4.3.1Measurement of mean cord height (hm) At evenly spaced intervals across the width of the test piece select a number of cords equal to 10 % of the total number of cords in the belt. Figure 3 Measurement of mean cord height (hm) Place the test piece with the uniform cover down, on the horizontal surface (3.1.4). If necessary ensure that the test piece remains flat by using clamps. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 7 Using the micrometer (4.1.1) or the optical magnifier (4.1.2) measure the height of each of the selected cords relative to the bottom surface of the belt. The measurement being taken to the upper edge of the cord (see Figure 3). Record the individual measurements h1, h2, h3 hn. Calculate the mean height hm as follows: hm h1h2h3hn n = + where n is the number of cords selected. 4.3.2Measurement of displaced cords above and below the mean value (h) Identify any cords which appear to be higher or lower than the mean level hm. Measure to the nearest 0,5 mm the height h of the upper edge of the cord over the bottom surface and calculate the difference h, in the level of each displaced cord relative to the mean height, hm, ignoring whether the deviation is positive or negative (see Figure 4). Arrange the results into three levels of severity h1, h2 and h3 and tabulate the results in the form shown in Table 1. Calculate the percentage based on the total number of cords across the test piece. Table 1 Evaluation of height differences h1h2h3 Total number of cords in the test piece No of cords h hm ± 1,0 mm No of cords h hm ± 1,0 mm and hm ± 1,5 mm No of cords h hm ± 1,5 mm QuantityPercentageQuantityPercentageQuantityPercentage Figure 4 Illustration of measurement of cord height Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 8 5 Test report The test report shall include the following particulars: a) reference to this European Standard; b) identification of the steel cord belt tested; c) mean cord pitch (tm); d) deviation of supported belt width; e) deviation of individual pitches; f) percentage h1, h2, h3 values; g) date of the test. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13827:2003 (E) 9 Bibliography prEN ISO 15236-1,Steel cord conveyor belts Part 1: Design, dimensions and mechanical requirements for conveyor belts for general use (ISO/DIS 15236-1:1996) Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 11:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 13827:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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