1、ASME B29.24-2002(Revision of ASME B29.24M-1995)ROLLER LOADCHAINS FOROVERHEAD HOISTSAN AMERICAN NATIONAL STANDARDREAFFIRMED 2016Intentionally left blank AN AMERICAN NATIONAL STANDARDROLLER LOAD CHAINS FOROVERHEAD HOISTSASME B29.24-2002(Revision of ASME B29.24M-1995)Date of Issuance: September 26, 200
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8、duced in any form,in an electronic retrieval system or otherwise,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.
9、A.CONTENTSForeword ivCommittee Roster vCorrespondence With the B29 Committee . vi1 Scope 12 Purpose 13 Roller Load Chains . 13.1 1Nomenclature 3.2 1General Proportions 3.3 1Numbering System 3.4 1Minimum Ultimate Tensile Strength 3.5 1Length Tolerance 3.6 4Measuring Load .3.7 4Preload .3.8 4General C
10、hain Dimensions .4 Roller Chain Inspection, Replacement, and Maintenance . 44.1 4Chain Inspection .4.2 7Maintenance .4.3 8Replacement of Load Chain Figures1 Typical Hoist Roller Load Chain . 22 Overhead Hoist 43 Elongation Measurement 54 Illustration of Camber and Twist . 55 Hook 66 Pin Turning . 67
11、 Inspection of Chain Rollers 78 Inspection for Tight Joints . 7Table1 General Load Chain Dimensions 3iiiFOREWORDA 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 design and con
12、struction, 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 required to
13、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 speci
14、al 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 l
15、ower 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 to serveas a guide to users and purchasers of overhead hoists with regard to hoist chain designations
16、,dimensions, ultimate strength, maintenance, and inspection procedures, and restrictions forchain replacement. The standard would also provide a reference in related standards suchas ASME/ANSI B30.16, Overhead Hoists (Underhung), (latest edition) with regard to chaincare and replacement.In tabulatin
17、g dimensional information in this Standard, customary inch-pound units havebeen used. Additionally, companion tabulations have been included in order to providetranslations of these values into metric (SI) units in accordance with ASME Guide SI-1,ASME Orientation and Guide for use of SI (Metric) Uni
18、ts. For this reason, certain formulasand relationships have been intentionally presented only in customary units so as to precludeany ambiguity between them and the tablulated values.ASME B29.24M-1995 included two significant modifications. The first is a reviseddefinition of Minimum Ultimate Tensil
19、e Strength that clarifies the meaning and use of theterm. The second is a revision to the listed values for maximum pin diameter. The changesin pin diameter will not affect the interchangeability of the chains. The pin diameters werechanged to provide a national basis for conversion between conventi
20、onal (inch) and SI(metric) dimensions. With concurrent changes in the related ISO standards, a long-standingsource of potential discrepancies will be eliminated.The lastest revision of this Standard includes two changes. One is the inclusion of therequirements to preload all chains covered by this S
21、tandard. The minimum preload valuesare derived from the requirements specified in the hoist standards such as ASME B30.21,Manually Lever Operated Hoists. The second change is the removal of 1 in. pitch80 HSseries chain.Suggestions for the improvement of this Standard are welcome. They should be addr
22、essedto the Secretary, ASME B29 Committee, Three Park Avenue, New York, NY 10016-5990.This Standard was approved as an American National Standard on August 20, 2002.ivASME STANDARDS COMMITTEE B29Chains, Attachments, and Sprockets for PowerTransmission and Conveying(The following is the roster of the
23、 Committee at the time of approval of this Standard.)OFFICERSJ. L. Wright, ChairC. G. Springman, Vice ChairM. Lo, SecretaryCOMMITTEE PERSONNELW. C. Hall, Ramsey Production Corp.L. E. Hampel, Allied-Locker Industries, Inc.M. Lo, The American Society of Mechanical EngineersA. M. McCarty, MGRD. Moore,
24、Jeffrey Chain Co.R. W. Neuhengen, Drives, Inc.V. D. Petershack, Hitachi Maxco Ltd.R. A. Reinfried, Conveyor Equipment Manufacturers AssociationS. Rhoad, Webster Industry, Inc.R. J. Rothchild, US TsubakiK. J. Smith, KONE, Inc.C. G. Springman, Diamond Chain Co.J. L. Wright, Diamond Chain Co.vCORRESPON
25、DENCE WITH THE B29 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with theCommittee by requesting interpretations, proposing revisions, and attending Committeemeetings. Corre
26、spondence should be addressed to:Secretary, B29 Main CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standard to incorporatechanges that appear necessary or desirable, as demonstrated by the expe
27、rience gained fromthe application of the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals shouldbe as specific as possible, citing the paragraph number(s), the proposed wording, and adetailed description of th
28、e reasons for the proposal, including any pertinent documentation.Interpretations. Upon request, the B29 Committee will render an interpretation of anyrequirement of the Standard. Interpretations can only be rendered in response to a writtenrequest sent to the Secretary of the B29 Main Committee.The
29、 request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the following format:Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the inte
30、rpretationis being requested.Question: Phrase the question as a request for an interpretation of a specificrequirement suitable for general understanding and use, not as a requestfor an approval of a proprietary design or situation. The inquirer mayalso include any plans or drawings, which are neces
31、sary to explainthe question; however, they should not contain proprietary names orinformation.Requests that are not in this format will be rewritten in this format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for r
32、econsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved byan interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASMEdoes not “approve,”“certify,”“rate,” or “endorse” any item, construct
33、ion, proprietary device,or activity.Attending Committee Meetings. The B29 Main Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretaryof the B29 Main Committee.viASME B29.24-2002ROLLER LOAD CHAINS FOR OVERHEAD HOISTS1 SCOPET
34、his Standard covers specialized roller chains thatare designed specifically as load chains for use inoverhead hoists.2 PURPOSEThe purpose of this Standard is to serve as a guideto purchasers and users of overhead hoists, and alsoas a reference in related standards such as ASME/ANSI B30.16, Overhead
35、Hoists (Underhung), (latestedition) with respect to roller load chains being madespecifically for use in various types of overhead hoists,including general chain dimensions, chain strengths,inspection and maintenance procedures, and guidelinesfor the proper selection of replacement chain.3 ROLLER LO
36、AD CHAINS3.1 NomenclatureThese chains consist of a series of alternately assem-bled roller links and pin links in which the pins articulateinside the bushing and the rollers are free to turn onthe bushing. The pins and bushing are press fit in theirrespective link plates. See Fig. 1.3.2 General Prop
37、ortions(a) Roller diameter is approximately58of the pitch.(b) Chain width is defined as the distance betweenroller link plates. It is approximately58of the chainpitch.(c) Pin diameter is approximately516of the pitchor12the roller diameter.(d) Maximum height of the roller link plates 0.95of the pitch
38、.(e) Maximum height of pin link plates 0.82 ofthe pitch.(f) Link plate thickness is approximately18of thechain pitch.13.3 Numbering SystemThe chain numbering system adopted for this Standardis based on chain pitch, and also on chain proportionsand link plate thickness as compared to the majorityof c
39、hains shown for a given pitch. A listing of loadchain numbers and related chain dimensions is givenin Table 1. The numbering system consists of a twodigit number, followed by either a single or double lettersuffix. These numbers and letter denote the following:(a) Left-Hand Digit denotes number of18
40、in. inthe chain pitch(b) Right-Hand Digit(1) 0 (zero) denotes chain of usual proportions(2) 1 (one) denotes chain of special proportions(c) Letter Suffix(1) S denotes normal link plate thickness(2) HS denotes heavier than normal link platethickness3.4 Minimum Ultimate Tensile StrengthMinimum Ultimat
41、e Tensile Strength (M.U.T.S.) forchain covered by this Standard is the minimum forceat which an unused, undamaged chain could fail whensubjected to a single tensile loading test.WARNING: The Minimum Ultimate Tensile Strength is NOT a“working load”! The M.U.T.S. greatly exceeds the maximumforce that
42、may be applied to the chain.(a) Test Procedure. A tensile force is slowly applied,at a rate not to exceed 2.0 in. per min, in a uniaxialdirection, to the ends of the chain sample.(b) The tensile test is a destructive test. Even thoughthe chain may not visibly fail when subjected to theMinimum Ultima
43、te Tensile Force, it will have beendamaged and will be unfit for service.3.5 Length ToleranceNew chains under standard measuring load shouldnot be underlength. The overlength tolerance is shownin Table 1 and it is based on:ROLLER LOAD CHAINS FOR OVERHEAD HOISTSASME B29.24-2002BEEFFGJHKLACRoller Link
44、 an inside link consisting of two roller link plates A, two bushings B, and two rollers CTypical Hoist Roller Load ChainPin Link an outside link consisting of two press fitpin plates E assembled with two pins FRiveted Type Connecting Link an outside link consisting of one press fit pin link plateE a
45、ssembled with two riveted pins F, and one separate press fit pin link plate GSpring Clip Type Connecting Link an outside linkconsisting of one press fit link plate E assembledwith two spring clip type chain pins K, one separatepress fit pin link plate G, and one spring clip LCotter Type Connecting L
46、ink an outside link consistingof one press fit pin link plate E assembled with two cottertype chain pins H, one separate press fit pin link plate G,and two wire cotters JEGEGFIG. 1 TYPICAL HOIST ROLLER LOAD CHAIN2ROLLER LOAD CHAINS FOR OVERHEAD HOISTS ASME B29.24-2002PFDHBZXWGTABLE1GENERALLOADCHAIND
47、IMENSIONSDimensions,in.(mm)Min.Min.Max.Min.WidthWidthMax.Max.WidthMax.UltimateMax.BetweenBetweenInnerOuterMax.OverWidthTensileMeasuringLengthANSINominalRollerInnerOuterPlatePlatePinInnerOverStrength,Load,Tolerance,ChainPitch,Diameter,Plates,Plates,Height,Height,Diameter,Link,Pins,lblbin./ftNo.PHWZGF
48、DXB(kN)(N)(mm/m)50S0.6250.4000.3700.5470.5940.5130.20040.5450.8257,000500.035(15.87)(10.16)(9.40)(13.89)(15.09)(13.03)(5.09)(13.84)(20.96)(31.14)(222)(2.91)50HS0.6250.4000.3700.5770.5940.5130.20040.5730.8817,800500.035(15.87)(10.16)(9.40)(14.66)(15.09)(13.03)(5.09)(14.55)(22.38)(34.69)(222)(2.91)60S
49、0.7500.4690.4950.7010.7130.6150.23460.6991.0079,000700.034(19.05)(11.91)(12.57)(17.81)(18.11)(15.62)(5.96)(17.75)(25.58)(40.03)(311)(2.83)60HS0.7500.4690.4950.7670.7130.6150.23460.7651.13010,000700.034(19.05)(11.91)(12.57)(19.48)(18.11)(15.62)(5.96)(19.43)(28.70)(44.48)(311)(2.83)81S1.0000.5620.4950.7670.8200.8200.28150.7651.18012,5001250.032(25.4)(14.27)(12.57)(19.48)(20.83)(20.83)(7.15)(19.43)(29.97)(55.60)(556)(2.66)3ROLLER LOAD CHAINS FOR OVERHEAD HOISTSASME B29.24-20020.002H20851pitch (in.)H208522+ 0.030 in. / ft3.6 Measuring LoadChains are to be measued for lengt
