1、Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.AN AMERICAN NA TIONALST ANDARDROLLER LOAD CHAINS FOROVERHEAD HOISTSASME B29.24-2002(Revisi
2、on of ASME B29.24M-1995)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:September 26,2002This Standard will be revised wh
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9、se,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted material licensed to Stanford University by Thomso
10、n Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B29 Committee.vi1Scope.12Purpose.13Roller Load Chains.13.11Nomenclature.3.21General Proport
11、ions.3.31Numbering System.3.41Minimum Ultimate Tensile Strength.3.51Length Tolerance.3.64Measuring Load.3.74Preload.3.84General Chain Dimensions.4Roller Chain Inspection,Replacement,and Maintenance.44.14Chain Inspection.4.27Maintenance.4.38Replacement of Load Chain.Figures1Typical Hoist Roller Load
12、Chain.22Overhead Hoist.43Elongation Measurement.54Illustration of Camber and Twist.55Hook.66Pin Turning.67Inspection of Chain Rollers.78Inspection for Tight Joints.7Table1General Load Chain Dimensions.3iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-
13、05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDA number of specialized roller chains are made and supplied to original equipmentmanufacturers for use as load chains on overhead hoists.Although these chains are ofsimilar desi
14、gn and construction,and are usually dimensionally interchangeable with equivalentpitch ANSI B29.1,Power Transmission Roller Chains,they differ in that they are normallymade using select steels and/or specially treated chain parts to provide for the higher tensileand fatigue strength properties requi
15、red to meet the rate load capacitites of the overheadhoists in which they are used.Hoist load chains are consequently assigned special chain numbers to distinguish themfrom equivalent pitch B29.1 or other roller chains,which even if dimensionaly interchangeable,may not have the necessary strength or
16、 special characteristics for replacement of the originalhoist load chain.It was recognized by the Roller Chain Technical Committee of the American ChainAssociation that a potential risk of personal injury could occur as a result of chain failureif the original load chiain was inadvertently replaced by a lower strenght chain,or if properuse,care,and maintenace procedures were not followed.Consequently,a committee wasformed in October 1978 to prepare a standared for chains used in overhead hoists