1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58plastics-covered conveyor belts of textile construction for underground miningThe European Standard
2、 EN ISO 22721:2007 has the status of a British StandardICS 53.040.20; 73.100.40Conveyor belts Specification for rubber- or BRITISH STANDARDBS EN ISO 22721:2007BS EN ISO 22721:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007
3、BSI 2007ISBN 978 0 580 55146 8Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN IS
4、O 22721:2007. It supersedes BS 3289:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to inclu
5、de all the necessary provisions of a EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 22721July 2007ICS 53.040.20; 73.100.40English VersionConveyor belts - Specification for rubber- or plastics-coveredconveyor belts of textile construction for underground mining(ISO 22721:2007)Courroies transpo
6、rteuses - Spcification pour courroiestransporteuses structure textile recouvertes decaoutchouc ou de plastique, pour utilisation dans les minessouterraines (ISO 22721:2007)Frdergurte - Anforderungen an Textilfrdergurte mitGummi- oder Kunststoff-Deckplatten fr Anwendungenunter Tage (ISO 22721:2007)Th
7、is European Standard was approved by CEN on 20 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
8、 concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its
9、 own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithua
10、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN A
11、ll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 22721:2007: EForeword This document (EN ISO 22721:2007) has been prepared by Technical Committee CEN/TC 188 “Conveyor belts“, the secretariat of which is held by BSI, in collaboration wi
12、th Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)“. 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 January 2008, and conflicting national standards shall be withdrawn at th
13、e latest by January 2008. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
14、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN ISO 22721:2007Reference numberISO 22721:2007(E)INTERNATIONAL STANDARD ISO22721First edition2007-07-15Conveyor belts Sp
15、ecification for rubber- or plastics-covered conveyor belts of textile construction for underground mining Courroies transporteuses Spcification pour courroies transporteuses structure textile recouvertes de caoutchouc ou de plastique, pour utilisation dans les mines souterraines EN ISO 22721:2007ii
16、iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Construction 3 5 Length 3 6 Width 4 7 Rubber cover. 4 8 Tolerances on total belt thickness and cover thickness 5 9 Transverse fabric joints in multi-ply belting 6 10 Longitudinal fabric joints. 6 11 Elon
17、gation . 7 12 Full thickness tensile strength 7 13 Adhesion 8 14 Troughability . 8 15 Sampling 9 16 Designation . 9 17 Identification 10 Annex A (informative) Items to be agreed between manufacturer and purchaser 11 Annex B (informative) Helpful information to be supplied by the purchaser 12 Annex C
18、 (informative) Lateral drift (straight running) 14 Bibliography . 15 EN ISO 22721:2007iv Foreword ISO (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
19、 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 that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO col
20、laborates closely with the International 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 S
21、tandards. Draft International Standards 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
22、 of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22721 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 41, Pulleys and belts (including veebelt
23、s), Subcommittee SC 3, Conveyor belts, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). EN ISO 22721:20071Conveyor belts Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining WARNING Users of this
24、International Standard should be aware that relevant electrical and flammability safety requirements are given in EN 14973, which specifies safety classes for belts intended for use in underground installations. When contracts are entered into for the purchase of belts for use in underground mining,
25、 compliance with both this International Standard and the relevant class in EN 14973 should be specified. Attention is drawn to local regulations for safety which might be in place where the belts are to be used. 1 Scope This International Standard specifies requirements for rubber- or plastics-cove
26、red conveyor belting of textile construction for underground mining on flat or troughed idlers. It is not applicable to light conveyor belts as described in ISO 21183-1. This International Standard does not include requirements for plastics covers. These will need to be agreed upon by the manufactur
27、er and purchaser, taking into account the type of plastics to be used. Related items that are not requirements of this International Standard, but which it is recommended be agreed upon by the manufacturer and purchaser, are included in Annex A. Details recommended to be supplied by the purchaser of
28、 belting with an enquiry are given in Annex B. The ability of a belt to run straight cannot be assessed until the belt is installed. Requirements for this are, therefore, outside the scope of this International Standard; nevertheless, recommendations for lateral drift are given in Annex C. 2 Normati
29、ve references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37, Rubber, vulcanized or therm
30、oplastic Determination of tensile stress-strain properties ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 252, Conveyor belts Adhesion between constitutive elements Test methods ISO 282, Conveyor belts Sampling ISO 283, Conveyor belts Full thickness ten
31、sile strength, elongation at break and elongation at the reference force Test method EN ISO 22721:20072 ISO 583, Conveyor belts with a textile carcass Total belt thickness and thickness of constitutive elements Test methods1)ISO 703, Conveyor belts Transverse flexibility (troughability) Test method
32、ISO 1120, Conveyor belts Determination of strength of mechanical fastenings Static test method ISO 4649:2002, Rubber, vulcanized or thermoplastic Determination of abrasion resistance using a rotating cylindrical drum device ISO 10247, Conveyor belts Characteristics of covers Classification ISO 16851
33、, Textile conveyor belts Determination of the net length of an endless (spliced) conveyor belt EN 14973:2006, Conveyor belts for use in underground installations Electrical and flammability safety requirements 3 Terms and definitions For the purposes of this document, the following terms and definit
34、ions apply. 3.1 slab belting conveyor belting made in wide widths and long lengths for subsequent slitting and cutting into narrower widths and shorter lengths to suit individual conveyor installations 3.2 solid woven belting conveyor belting consisting of a carcass of more than one ply, the plies b
35、eing interlocked in the weave or bound together by binding threads in the course of weaving 3.3 mono-ply belting conveyor belting with a carcass consisting of one ply of woven textile fabric 3.4 duo-ply belting conveyor belting with a carcass consisting of two plies of woven textile fabric bonded to
36、gether by an intermediate layer of elastomer of sufficient thickness to allow the incorporation of a tension element in the joint 3.5 multi-ply belting conveyor belting with a carcass of two or more plies of woven textile fabric, the adjacent plies being bonded together by an intermediate layer of e
37、lastomer 3.6 primary yarn load-carrying yarn which contributes more than 50 % of the full thickness tensile strength 3.7 secondary yarn load-carrying yarn which contributes less than 50 % of the full thickness tensile strength 1) To be published. (Revision of ISO 583-1:1999 and ISO 583:1990) EN ISO
38、22721:200734 Construction The carcass shall consist either of one or more plies of woven fabric, or of solid woven fabric, and shall be impregnated or coated with a rubber or plastic. If a breaker consisting of open mesh fabric or cord fabric or cord layer is placed between the cover and carcass, or
39、 is embedded in the cover for the purpose of carcass protection, such a layer shall be considered to be part of the cover thickness and shall not be counted as a fabric ply. If a fabric pile is integrally woven with the carcass on either one or both surfaces of the carcass, it shall be considered to
40、 be part of the carcass thickness. NOTE The external surfaces of the conveyor belt will generally consist of a defined thickness and quality of elastomeric material. 5 Length 5.1 Belting that is ordered to an open-ended length shall be supplied subject to the tolerances in accordance with Table 1. 5
41、.2 The length of belting supplied in the spliced endless form shall be described by the term net endless length. The net endless length shall be supplied subject to the tolerances in accordance with Table 2, when measured in accordance with ISO 16851. It is recommended that, when placing orders for
42、belting, purchasers specify a length of belting that includes such lengths as are required for testing and any additional lengths necessary for vulcanized joints. Table 1 Tolerances on open-end lengths of belting Belt delivery condition Maximum permissible difference between delivered length and ord
43、ered length % Slab belting 5 As one length 2,50+In several lengths: for each single length for the sum of all lengths 5 2,50+Table 2 Tolerances on net endless lengths of belting Length of belt Tolerance u 15 m 50 mm 15 m and u 20 m 75 mm 20 m 0,5 % EN ISO 22721:20074 6 Width The width of the belting
44、 and its associated tolerance shall be in accordance with Table 3. Table 3 Widths and tolerances on width of conveyor belting Nominal width of belting mm Tolerance on width 300 400 450 a500 7,5 mm 600 650 750 a800 900 a1 000 1 050 a1 200 1 350 a1 400 1 500 a1 600 1 800 2 000 1,5 % aWidth that should
45、 only be used for replacement belting in existing installations and not be used as a basis for future new designs. 7 Rubber cover 7.1 If the rubber cover is designated as class H, D or L, it shall conform to the appropriate requirements given in Table 4, and, after ageing for 168 h at 70 C in accord
46、ance with ISO 188, the values obtained for tensile strength and elongation at break shall not vary from the original unaged values by more than 25 % of those values. 7.2 If the thickness of the rubber cover, measured in accordance with ISO 583, is between 0,8 mm and 1,6 mm, the thickness of the test
47、 piece used, in accordance with ISO 37 shall be the maximum obtainable and a tolerance of 15 % shall be permitted on values of tensile strength and elongation at break given in Table 4. EN ISO 22721:20075Table 4 Classification of conveyor belt rubber covers Cover class Minimum tensile strength of ru
48、bber cover N/mm2Minimum elongation at break % Maximum abrasion loss in relative volume mm3H 24 450 120 D 18 400 100 K 20 400 200 L 15 350 200 V 17 350 175 Test method ISO 37 ISO 37 ISO 4649:2002, Method A These values will help to determine the appropriate cover compound for the application or for t
49、he materials carried. Other values, such as tear resistance, may be considered, if required. Reliable assessment of the behaviour of the covers in service for wear and cut resistance cannot be determined from tensile strength, elongation and abrasion values alone. The cover grades H, D and L are in accordance with ISO 10247. If other cover materials or qualities are required for a particular application (e.g. safety, oil resistance or heat resistance), the cover prope
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