【BS英國標準】BSEN818-7-2002升降用的短節(jié)鏈條.安全.鏈式吊索.精密公差吊鏈、等級T(類型T、—AT和—T).doc

british standard bs en818-7:2002short link chain for lifting purposes safety part 7: fine tolerance hoist chain, grade t (types t, dat and dt)the european standard en 818-7:2002 has the status of abritish standardics 53.020.30; 77.140.65no copying without bsi permission except as permitted by copyright lawbs en 818-7:2002national forewordthis british standard is the official english language version ofen 818-7:2002. it supersedes bs 4942-6:1981 which is withdrawn.the uk participation in its preparation was entrusted to technical committeemhe/1, chains and fittings, which has the responsibility to:aid enquirers to understand the text;present to the responsible 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.a list of organizations represented on this committee can be obtained on request to its secretary.cross-referencesthe 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 british 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.this british standard, having been prepared under the direction of the engineering sector policy and strategy committee, was published under the authority of the standards policy and strategy committee on 19 march 2002 bsi 19 march 2002isbn 0 580 39277 5summary of pagesthis document comprises a front cover, an inside front cover, the en title page,pages 2 to 35 and a back cover.the bsi copyright date displayed in this document indicates when the document was last issued.amd. no.datecommentsamendments issued since publicationeuropean standard norme europenneeuropische normen 818-7february 2002ics 53.020.30english versionshort link chain for lifting purposes - safety - part 7: fine tolerance hoist chain, grade t (types t, dat and dt)chanes de levage maillons courts - scurit - partie 7: chanes de tolrance serre pour les palans, classe t (types t, dat et dt)kurzgliedrige rundstahlketten fr hebezwecke - sicherheit- teil 7: feintolerierte hebezeugketten, gteklasse t (ausfhrung t, dat und dt)this european standard was approved by cen on 8 november 2001.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 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 under the responsibility of a cen member into its own language and notified to the management centre 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, iceland, ireland, italy, luxembourg, malta, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.european committee for standardization c o m i t eur o p en de nor m a l i s a ti on eur o p i s c h es kom i tee f r nor m ung management centre: rue de stassart, 36 b-1050 brussels 2002 cenall rights of exploitation in any form and by any means reserved worldwide for cen national members.ref. no. en 818-7:2002 een 818-7:2002 (e)contentspageforeword . 3introduction . 41scope. 42normative references. 53terms and definitions . 54hazards . 65safety requirements. 76verification of safety requirements . 147marking. 188manufacturers certificate. 189information for use and assembly of the hoist chain into the hoist . 18annex a (normative) calculation of dimensions, working load limits and mechanicalproperties . 20annex b (normative) selection criteria for fine tolerance chain for power driven hoists.types t, dat and dt . 23annex c (informative) designation system for hoist chain - grade t . 31annex d (informative) approximate mass of grade t hoist chain . 32annex e (informative) chain use . 33annex za (informative) relationship of this document with ec directives . 34bibliography . 352forewordthis document en 818-7:2002 has been prepared by technical committee cen /tc 168 chains, ropes, webbings, slings and accessories, 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 august 2002, and conflicting national standards shall be withdrawn at the latest by august 2002.this document has been prepared under a mandate given to cen by the european commission and the european free trade association, and supports essential requirements of ec directive(s).for relationship with ec directive(s), see informative annex za, which is an integral part of this document.the other parts of en 818 are:part 1: general conditions of acceptancepart 2: medium tolerance chain for chain slings - grade 8part 3: medium tolerance chain for chain slings - grade 4part 4: chain slings - grade 8part 5: chain slings - grade 4part 6: chain slings - specification for information for use and maintenance to be provided by the manufacturer.this is the first edition of this part of en 818.the annexes a and b are normative. the annexes c, d, e and za are informative.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, iceland, ireland, italy, luxembourg, malta, netherlands, norway, portugal, spain, sweden, switzerland and the united kingdom.23introductionthis european standard has been prepared to be a harmonized standard to provide one means of conforming with the essential safety requirements of the machinery directive and associated efta regulations.these chains are intended for use in serial hoists. the multiple pitch is fine toleranced.the extent to which hazards are covered is indicated in the scope of this european standard. in addition, lifting equipment should conform as appropriate to en 292 for hazards which are not covered by this standard.annex a is normative and gives the bases for the calculation of the dimensions and the mechanical properties of hoist chains.annex b is normative and gives selection criteria for the nominal size of hoist chains, grade t, types t, dat and dt for serial hoists.annex c is informative and gives a designation system for recording the identifying features of fine tolerance short link chain grade t. since this system is not widely used it has been included in this first edition of this standard as an informative annex; however, should its use become more generally accepted then the status of the information would need to be reviewed.1scopethis european standard specifies the requirements related to safety for hoist chain, grade t (type t quenched and tempered and types dat and dt case hardened), for use in serial chain hoists manual and power driven.type dat and type dt hoist chains possess surface hardnesses greater than core hardness and are used for power driven chain hoists to offer greater resistance to wear.type dt hoist chain differs from dat hoist chain in having higher surface hardness and/or greater case depth to optimise wear resistance.the standard is applicable to electrically welded round steel short link hoist chains conforming toen 818-1.the range of nominal size of hoist chains covered by this european standard is from 4 mm to 22 mm. the hazards covered by this european standard are identified in clause 4.2normative referencesthis european standard incorporates, by dated or undated reference 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 publications 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 (including amendments).en 292-1:1991, safety of machinery basic concepts general principles for design part 1: basic terminology, methodology.en 292-2:1991/a1:1995, safety of machinery basic concepts general principles for design part 2: technical principles and specifications.en 818-1:1996, short link chain for lifting purposes safety part 1: general conditions of acceptance.en 1050:1996, safety of machinery principles for risk assessment.en iso 7500-1, metallic materials - verification of static uniaxial testing machines - part 1: tension/compression testing machines (iso 7500-1:1999).en 10025, hot rolled products of non-alloy structural steels; technical delivery conditions (includes amendment a1:1993).iso 643, steels micrographic determination of the ferritic or austenitic grain size.iso 4301-1, cranes and lifting appliances classification part 1: general.iso 6507-1, metallic materials vickers hardness test part 1: test method.iso 4965, axial load fatigue testing machines - dynamic force calibration - strain gauge technique.3terms and definitionsfor the purposes of this european standard the terms, definitions and symbols given in en 818-1 apply.4hazardsthe release of a load due to failure of hoist chain puts at risk either directly or indirectly the safety or health of those persons within the danger zone of lifting equipment.in order to provide the necessary strength and durability of hoist chain, this european standard lays down requirements for the design, selection of materials of construction and testing to ensure that specified levels of performance are met.fatigue failure has not been identified as a hazard for type t chain when hoist chain selected according to annex b and having the specified levels of performance and design given in this european standard is used in serial hoists.fatigue failure has been identified as a hazard for hoist chains types dat and dt used in power driven hoists. therefore this european standard specifies levels of design and performance, with particular reference to fatigue resistance.since failure can be caused by the incorrect choice of grades and specification of lifting hoist chain thiseuropean standard also gives the requirements for marking and the manufacturers certificate.dimensional incompatibility between the hoist chain and mating parts of the hoist (chain wheel, chain guide and loading device) may lead to premature failure and this european standard contains dimensional requirements for correct assembly and fit.table 1 lists those hazards, which require action to reduce risk identified by risk assessment as being specific and significant for hoist chain of grade t types t, dat, dt.table 1 hazards and associated requirementshazards identified in annex a ofen 1050:1996relevant clause of annex a ofen 292-2:1991/a1:1995relevant clause/subclauseof this standard1.emechanical hazard due toinadequacy of strength.2.3 .34.3.15671.5(types dat, dt only)fatigue failure-5.5.6and 6.2.75safety requirements5.1 generalthe hoist chains shall conform to the requirements of en 818-1.5.2 dimensions5.2.1generala selection of nominal sizes and dimensions is given in 5.2.2 and 5.2.4. other nominal sizes may be used, provided that nominal sizes shall not exceed the range specified in 5.2.2 and that the dimensions and tolerances are calculated in accordance with annex a.whilst the nominal link pitch pn is based upon 3 dn (where dn is the nominal size of the hoist chains) this may be varied but shall not exceed the limits 2,6 dn to 3,2 dn. the nominal link pitch pn shall be subject to the tolerances specified in annex a.notecompatibility between the hoist chain and the mating parts of the hoist requires agreement on the nominal size and dimensions and on the distribution of tolerances between the chain manufacturer and the hoist manufacturer.5.2.2nominal size dnthe nominal size shall not be below 4 mm or above 22 mm, a selection of nominal sizes is listed intable tolerances on material diameterthe tolerances on material diameter for the selected nominal sizes shall be as listed in table 2. these and all other nominal size material diameter tolerances shall be calculated in accordance with a.pitch and widthsthe dimensions and tolerances of the 3 dn pitch and the width for the selected nominal sizes shall be as listed in table 2. the dimensions and tolerances of the pitch and width shall be calculated in accordance with a.1.these dimensions and tolerances and all other nominal size and pitch ranges and tolerances of multiple pitch lengths, shall be calculated in accordance with a.1.the tolerances of multiple pitch lengths shall be calculated in accordance with a.1.table 2 selected dimensionsdimensions in millimetrespitchwidthgauge length of11 x pnwelddiameterdsmax.nominalsizednmaterialdiameter tolerancepntolerance1internalw3min.externalw2max.tolerance1)4 0,2120,254,813,61320,64,35 0,2150,36,017,01650,85,46 0,2180,357,220,41981,06,57 0,3210,48,423,82311,17,68 0,3240,59,627,22641,38,69 0,4270,510,830,62971,49,710 0,4300,612,034,03301,610,811 0,4330,613,237,43631,711,912 0,5360,714,440,83961,913,013 0,5390,815,644,24292,114,014 0,6420,816,847,64622,215,116 0,6480,919,254,45282,517,318 0,9541,021,661,25942,919,420 1,0601,224,068,06603,221,622 1,1661,326,474,87263,523,81) these tolerances are usually divided into + 2/3 and 1/3 for both the individual link and thestandard gauge length.5.2.5weld diameterthe maximum diameter at the weld for the selected nominal sizes shall be as in table 2 and shall be calculated in accordance with annex a. the maximum diameter at the weld shall not be in excess of 8 % above the nominal size in any direction. the thickness of the steel at the weld shall nowhere be less than the actual diameter of the steel adjacent to the weld.5.2.6length dimensionally affected by weldingthe length dimensionally affected by welding e shall not extend by more than 0.6 dn to either side of the centre of the link (see figure 1).key1traverse centre line of the linklis the multiple pitch lengthpis the pitchdm is the material diameter as measureddsis t