1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58ICS 77.140.65Steel wire ropes Determination of rotational propertiesBRITISH STANDARDBS ISO 21669:20
2、05BS ISO 21669:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 January 2006 BSI 30 January 2006ISBN 0 580 47630 8The British Standards which implement international publications referred to in this document may be found in the BSI Cata
3、logue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its cor
4、rect application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 5 and a back cover.The BSI copyright notice displayed in this do
5、cument indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiries on the interpretation, or proposals for change, and keep UK interest
6、s informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 21669:2005 and implements it as the UK national standard.The UK participation in its preparation was entrusted to Technical Committee MHE/2
7、, Wire ropes, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any Reference numberISO 21669:2005(E)INTERNATIONAL STANDARD ISO21669First edition2005-02-15Steel wire ropes Determination of rotational properties Cbles en
8、 acier Dtermination des caractristiques de rotation BS ISO 21669:2005ii iiiForeword 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 through ISO t
9、echnical 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 collaborates clos
10、ely 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 Standards. Draf
11、t 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 of this docum
12、ent may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 21669 was prepared by Technical Committee ISO/TC 105, Steel wire ropes. BS ISO 21669:2005iv Introduction This International Standard is intended to provide rope manufacturers
13、, suppliers and independent testing bodies with a standard method of test for determining the rotational properties of steel wire rope. While the test method specified in this International Standard has essentially been developed to assist in deciding whether a swivel can be used with a crane hoist
14、rope, it may also be used for other crane rope duties and other steel wire rope applications where the machinery/equipment designer or user requires to know the rotational properties as part of the rope selection process. BS ISO 21669:20051Steel wire ropes Determination of rotational properties 1 Sc
15、ope This International Standard specifies a method for determining the rotational properties of steel wire rope. General guidance on the use of a swivel is given in Annex A. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated re
16、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 17893, Steel wire ropes Vocabulary, designation and classification 3 Terms and definitions For the purposes of this document, the terms and definiti
17、ons in ISO 17893 apply. 4 Test piece The test piece shall be representative of the rope as a whole, be free from defects and shall be independent of the rope used to lift the load. The free length of rope between end terminations shall be at least 100 d, where d is the nominal diameter of the rope,
18、in millimetres. End terminations shall be of the following types: swaged socket, resin- or metal-filled socket, wedge socket or ferrule-secured eye with thimble. NOTE As ropes of a given construction having similar design parameters are expected to have similar rotational properties throughout the s
19、ize range, the rope manufacturer may carry out type testing on a representative size. 5 Test machine The test equipment shall have the required capacity to lift the test load. The test piece shall be prevented from rotating at its upper end during the test. See Figure 1 for a typical test arrangemen
20、t when a hook is used. BS ISO 21669:20052 A pointer shall be attached to the lower end of the load or the test piece to facilitate measuring of the rotation of the rope. Graduations on the measuring scale shall be no greater than 45. The test load shall be capable of being attached to the lower end
21、of the test piece and its mass shall be equivalent to at least 20 % of the minimum breaking force, Fmin, of the rope being tested. When the mass of the test load is greater than 20 % of the minimum breaking force of the rope being tested, the measured rotation shall not be adjusted to take account o
22、f the greater load. 6 Test method Measure the free length of rope under test. Attach the load to be lifted to the lower end of the rope to be tested and establish the datum point for the pointer. Raise the load from the ground level while ensuring clearance exists between the load and the ground. Ca
23、re should be taken to avoid any rotational momentum of the load as it is being raised until the load has reached equilibrium position. During raising of the load, observe the number of complete turns the pointer makes as well as measuring the angular deflection from the datum point. Record the total
24、 angular deflection of the pointer. 7 Rotational property The rotational property shall be determined from the amount of rotation observed in the test and the measured length of the test piece. The amount of rotation observed in the test shall be converted into a value for a rope length 1 000d. When
25、 the measured free length of the test piece is not equivalent to 1 000d, the observed rotation (turns) shall be adjusted in direct proportion to the change in length between the two. As an example, if the observed rotation is 1 turn with a test piece having a free length of 250d, then the resulting
26、rotational value is 4 turns per 1 000d. The rotational property shall be expressed as the number of turns (of rotation) per unit length of 1 000d, where 1 turn is equal to 360. BS ISO 21669:20053Key 1 crane hoist rope 5 pointer 2 bottom block 6 load 3 blocked hook 7 graduated display 4 test piece Fi
27、gure 1 Typical test arrangement BS ISO 21669:20054 8 Test report The test report shall contain at least the following information: a) test number; b) reference to this International Standard; c) rope designation and minimum breaking force of rope, in kilonewtons; d) the resulting rotational value, e
28、xpressed in turns per 1 000d. e) test load, in tonnes. BS ISO 21669:20055Annex A (informative) Guidance on the use of swivels To limit the hazard of a rotating load during a lifting operation and to ensure the safety of personnel within the lifting zone, it is preferable to select a rotation-resista
29、nt rope that will only rotate a small amount when loaded, see a) below. With such ropes, the usefulness of a swivel is to relieve the rope of any induced rotation resulting from angular deflections at a sheave or drum. Other rotation-resistant ropes, having less resistance to rotation when loaded, s
30、ee b) below, are likely to require the assistance of a swivel to minimize the hazard. In such cases, however, it should be recognized that excessive rope rotation can have an adverse affect on rope performance and can also result in a reduction in breaking force of the rope, the amounts of which wil
31、l depend on the rotational property of the selected rope and the magnitude of the load being lifted. Each such lifting operation should be assessed by a competent person and the crane manual should reference the approval for use of a swivel based on a maximum lift condition and examination of the ro
32、pe at specified periods. The following is a summary of general guidance on the use of a swivel based on the rotational property of the rope: a) rotational property less than or equal to 1 turn/1 000d lifting a load equivalent to 20 % of Fmin a swivel can be used; b) rotational property greater than
33、1 turn but no greater than 4 turns/1 000d lifting a load equivalent to 20 % of Fmin a swivel may be used subject to the recommendations of the rope manufacturer and/or approval of a competent person; c) rotational property greater than 4 turns/1 000d lifting a load equivalent to 20 % of Fmin a swive
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