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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1718:1999 The Europ
2、ean Standard EN 1718:1999 has the status of a British Standard ICS 53.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Light conveyor belts Test method for the measurement of the electrostatic field generated by a running light conveyor belt This British Standard, having
3、 been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 BSI 06-1999 ISBN 0 580 32482 6 BS EN 1718:1999 Amendments issued since publication Amd. No.DateComments National
4、foreword This British Standard is the English language version of EN 1718:1999. The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee an
5、y 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. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references T
6、he British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A Bri
7、tish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fro
8、nt cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form
9、and by any means reserved worldwide for CEN national Members. Ref. No. EN 1718:1999 E EUROPEAN STANDARDEN 1718 NORME EUROPE ENNE EUROPA ISCHE NORM January 1999 ICS 53.040.20 Descriptors: belts, conveyor belts, tests, measurements, electrostatics, electrostatic protection English version Light convey
10、or belts Test method for the measurement of the electrostatic field generated by a running light conveyor belt Courroies transporteuses le ge res Me thode dessai pour le mesurage du champ e lectrostatique engendre par une courroie transporteuse le ge re en marche Leichte Fo rdergurte Pru fverfahren
11、zur Messung des von einem laufenden leichten Fo rdergurt erzeugten elektrostatischen Feldes This European Standard was approved by CEN on 8 November 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
12、atus 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
13、 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,
14、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 1718:1999 BSI 06-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 188, Conveyor belts, the Secretariat of which i
15、s 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 July 1999, and conflicting national standards shall be withdrawn at the latest by July 1999. According to the CEN/CENELEC Internal Re
16、gulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and th
17、e United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Test piece5 6Procedure5 7Expression of results5 8Test report5 Page 3 EN 1718:1999 BSI 06-1999 1 Scope This European Standard specifies a method of test for the measurement of the electrostatic field gen
18、erated by a running light conveyor belt as described in EN 873. This dynamic procedure is required since the antistatic behaviour of light conveyor belts can in many cases not always sufficiently be described by measurement of the electrical resistances described in prEN 1637. 2 Normative references
19、 This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these p
20、ublications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 873, Light conveyor belts Principal characteristics and applications. prEN 1637, Light conveyor belts Test methods
21、for the measurement of the electrical resistances. prEN 1723, Light conveyor belts Determination of the relaxed elastic modulus. ISO 22, Belt drives Flat transmission belts and corresponding pulleys Dimensions and tolerances. ISO 471:1995, Rubber Temperatures, humidities and times for conditioning a
22、nd testing. ISO 554, Standard atmospheres for conditioning and/or testing Specifications. ISO 4287-1, Surface roughness Terminology Part 1: Surface and its parameters. 3 Principle The test piece runs under specified conditions and produces an electrostatic field of which the course of its variation
23、with time is recorded. The test is carried out successively with both sides of the belt in contact with the pulleys. 4 Apparatus Testing apparatus (see Figure 1) consists of the following main parts. 4.1 Pair of pulleys The pulleys shall be electrically connected and earthed. 4.1.1 Material Steel. 4
24、.1.2 Dimensions Diameter is 200 mm or larger; rim width is 120 mm. 4.1.3 Surface finish Raw, unplated surface roughness of maximum Ra= 1,6 mm, in accordance with ISO 4287-1. Final coating is of chromium plating. 4.1.4 Drive pulley Fixed, cylindrical. 4.1.5 Driven pulley Moveable for tensioning, crow
25、ned in accordance with ISO 22 (h = 0,6 mm). 4.2 Tensioning device To achieve uniform surface pressures, the test piece shall be loaded according to its k1 %value (see Table 1) by means of a suitable tensioning device. Table 1 Shaft load required k1 %1)Shaft load, F N/mmN # 2,550 2,5 to 10300 10 to 3
26、0900 30As per agreement 1)k1 %value has to be established in accordance with prEN 1723. 4.3 Drive The belt runs directly from the drive pulley to the measuring device at a speed of 5 m/s. 4.4 Measuring device Standard commercial electrostatic field meter with signal output. 4.5 Recording For example
27、, a y/t recorder. 4.6 Electrostatic field corrections 4.6.1 Field distortion created by the measuring electrode Correction is obtained by equipping the electrode with an earthed steel plate 200 mm 3 200 mm (see Figure 1). Edges all round are bent up with a radius of approximately 10 mm (see Figure 1
28、). The lower surface of the electrode is flush with the lower surface of the steel plate. 4.6.2 Field distortion created by the test piece return side The test piece return side generates its own field. The field to be measured shall be shielded from it by means of an earthed steel plate 600 mm 3 20
29、0 mm (see Figure 1). Edges all round are bent up with a radius of approximately 10 mm (see Figure 1). Page 4 EN 1718:1999 BSI 06-1999 Dimensions in millimetres 1)Diameter 200 mm or larger: see clause 6. 1Measuring device with electrode, diameter 50 mm to 55 mm. 2Measuring distance of test piece surf
30、ace not being in contact with pulleys. 3Direction of run. 4Driven pulley, movable, crowned. 5Test piece, endless (2 50050) mm 3 (1001) mm. 6Earthed steel plate, 600 mm 3 200 mm. 7Earthed steel plate, 200 mm 3 200 mm. 8Drive pulley, fixed, cylindrical. Figure 1 Basic arrangement of test bench for the
31、 measurement of the electrostatic field strength generated by a running light conveyor belt Page 5 EN 1718:1999 BSI 06-1999 5 Test piece 5.1 Material Test piece material shall be new, unused (virgin), and shall not be tested earlier than 5 days after manufacture. It shall exhibit no contamination or
32、 superficial damage. 5.2 Dimensions The endless length shall be (2 50050) mm. The width shall be (1001) mm. 5.3 Endless joining The test piece shall be joined endless according to the producers standard recommendations. 5.4 Cleaning of the pulleys The pulleys shall be metallic clean. 5.5 Conditionin
33、g Before testing, expose the test piece for a minimum of 24 h to a test-room climate of (232) 8C and (505) % relative humidity, as specified in ISO 471 and ISO 554. To obtain results with high-conductivity belts, the relative humidity may have to be reduced to (255) %. 6 Procedure Conveyor belts whi
34、ch, due to their construction, require pulley diameters of more than 200 mm, shall be tested with the smallest diameter admissible, following the manufacturers indication. Check the test-room climate (see 5.5). Clean both pulleys (see 5.4) and, if necessary, remove any dust from the shielding steel
35、plates. Install the endless-joined (see 5.3) and conditioned (see 5.5) test piece on the test device, with the normal running side in contact with the pulleys. Tension the test piece in accordance with 4.2. Install the recorder. Position the measuring device on the centre line of the test piece, 500
36、 mm from the centre of the drive pulley, with a space of 25 mm between the test piece surface which is not in contact with the pulley (see Figure 1). Start the test piece and run it from the drive pulley directly to the field measuring device. Record the electrostatic field strength E in volts per m
37、etre. The measurement time shall be 30 min. Repeat the procedure, with the other side of the belt in contact with the pulleys. 7 Expression of results The 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
38、a change over the final 10 min is less than 10 %) and these two figures shall be recorded, together with their respective polarities, as the test results in volts per metre. From these values of the field strength E, the appertaining surface potential U in volts shall be calculated as follows: U = E
39、 3 a where ais the distance in metres between the measuring electrode and the conveyor belt surface. These results are valid for virgin material as per 5.1. If more than one measurement on one side is carried out (several measurements on one test piece or several test pieces), the arithmetic mean of
40、 the individual values of E in volts per metre shall be taken. All the values are to be indicated. 8 Test report The test report shall include the following particulars: a) complete designation of the tested conveyor belt material and manufacturing date; b) k1 %value of the test piece(s); c) referen
41、ce to this European Standard, and any necessary exceptions; d) places from which test piece(s) were taken; e) test-room temperature and relative humidity; f) conditioning period; g) the shaft load in newtons; h) indication of the belt side in contact with the pulleys; i) the test results in accordan
42、ce with clause 7; j) date of test. BS EN 1718:1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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