1、BRITISH STANDARD BS ISO 6972:2002 Cranked-link mill chains of welded construction, attachments and sprockets ICS 21.220.30 BS ISO 6972:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of th
2、e Standards Policy and Strategy Committee on 11 October 2002 BSI 11 October 2002 ISBN 0 580 40548 6 National foreword This British Standard reproduces verbatim ISO 6972:2002 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MC
3、E/1, Chains and chain wheels for power transmission and conveyors, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this
4、 document may be found in the BSI Catalogue 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 cont
5、ract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals f
6、or change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 18, an inside back cover and a back cove
7、r. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 6972:2002(E)INTERNATIONAL STANDARD ISO 6972 Second edition 2002-09-15 Cranked-link mill chains of welded construction, att
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13、wiso.ch ii BSISO6972:2002 iiiContents Page Foreword iv 1 Scope 1 2 Normative reference 1 3 Chains. 1 3.1 General . 1 3.2 Nomenclature 1 3.3 Dimensions 2 3.4 Tensile strength. 2 3.5 Length accuracy 2 3.6 Designation 2 3.7 Marking. 2 4 Attachments. 6 4.1 Types 6 4.2 Dimensions 6 5 Sprockets . 13 5.1 D
14、iametral dimensions. 13 5.2 Tooth gap form 16 5.3 Rim profile 16 5.4 Tolerances . 18 5.5 Marking. 18 BSISO6972:2002iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stan
15、dards is normally carried out 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 t
16、ake part in the work. ISO collaborates 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 3. The main task of technical committees
17、is to prepare International Standards. 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 possibil
18、ity that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6972 was prepared by Technical Committee ISO/TC 100, Chains and chain wheels for power transmission and conveyors. Th
19、is second edition cancels and replaces the first edition (ISO 6972:1982), which has been technically revised. In particular, the references and terminology have been revised to bring them into conformity with other International Standards and current practice. Technical revisions comprise the additi
20、on of chain W855, in acknowledgement of the increased use of this type of chain, and the deletion of H1, H2, R1 and R2 attachments, which are no longer used. Furthermore, in clause 5, the pitch line clearance of sprockets has been altered for consistency with current industry practice. BSISO6972:200
21、2INTENRATIONAL TSANDADR IS:2796 O2002(E)1Cranked-link mill chains of welded construction, attachments and sprockets 1 Scope This International Standard specifies the characteristics of cranked-link 1)mill chains of welded construction suitable for conveying bulk materials, together with associated a
22、ttachments and chain sprockets. The chain dimensions specified in this International Standard ensure interchangeability of both complete chains and individual links for repair purposes. This International Standard is applicable to sprockets with between 5 and 36 teeth. Specifications are also given
23、for eight types of attachment for use with the conveyor chains conforming to this International Standard. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subs
24、equent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the
25、latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts 3 Chains 3.1 General The
26、chain is designed to operate with the closed end of each link in the forward direction to produce the maximum scraping action against the material to be conveyed. 3.2 Nomenclature The nomenclature of the chains and their component parts is specified in Figures 1 and 2. 1) In the USA, the term “offse
27、t sidebar” is used in place of “cranked link”. BSISO6972:20022 3.3 Dimensions Conveyor chain dimensions shall conform to those given in Table 1 (see Figure 3). Both maximum and minimum dimensions are specified to ensure interchangeability of links made by different chain manufacturers. Although thes
28、e represent limits for interchangeability, they shall not necessarily be regarded as limits of tolerance for manufacture. 3.4 Tensile strength 3.4.1 Minimum tensile strength The minimum tensile strength is that value which shall be exceeded when a tensile force is applied to a sample which is tested
29、 to destruction in accordance with 3.4.2. NOTE This minimum tensile strength is not a working force. It is intended primarily as a comparative figure between chains of different construction. For application information, it is necessary to consult the manufacturers or their published data. 3.4.2 Ten
30、sile testing A tensile force, not less than the minimum tensile strength specified in Table 1, shall be applied slowly to the ends of a chain, containing a minimum of three free pitches, by means of shackles so designed as to allow universal movement. The actual test method is at the discretion of t
31、he manufacturer. Failure shall be considered to have occurred at the first point where increasing extension is no longer accompanied by increasing force, i.e. the summit of the force/extension diagram. Any test in which failure occurs adjacent to the shackles shall be disregarded. 3.5 Length accurac
32、y Finished chains shall be measured either in the dry state or after light lubrication. The standard nominal length for measurement shall be that nearest to 3 048 mm. The chain shall be supported throughout its length and the measuring force specified in Table 1 shall be applied. The finished chain
33、length shall be equal to the nominal chain length 0,32 %0 + . Chains that work in parallel may be matched by agreement between the purchaser and the manufacturer. 3.6 Designation The designation numbers for welded-steel-type cranked link mill chains are based on the ISO chain numbers given in Table
34、1. These numbers are derived from those given to the cast pintle or steel engineering type which they replace and have been given the prefix W to indicate that they are of welded design. 3.7 Marking The chains shall be marked with the manufacturers name or trademark and in addition should be marked
35、with the appropriate ISO chain number given in Table 1. The marking of the chain shall not be obscured by the attachments. BSISO6972:2002 3NOTE The illustration does not define the actual form of the cranked link. Figure 1 Cranked link chain assembly Key 1 Cranked plate 2 Bush 3 Connecting pin NOTE
36、The illustration does not define the actual form of the cranked link. Figure 2 Typical cranked link components BSISO6972:20024 The overall width of connecting links is b 5+ b 6 ,when riveted b 4+ b 5 ,when there is a fastener at one side 2 b 4 ,when there is a fastener at both sides The line of cran
37、king, or offset, between l 1and l 2is straight. NOTE The illustration does not define the actual form of the cranked link. aPitch line Figure 3 Chain dimensions and symbols (see Table 1) BSISO6972:2002 5 Table 1 Chain dimensions, measuring forces and tensile strengths Tensile strength Pitch Bush dia
38、meter Width between plates for sprocket contact at inner end Connecting pin body diameter Bush bore Chain path depth Plate depth Crank clearance dimensions Plate end clearance dimensions Width over link at inner end Width between plates at outer end Width over pin fastening to centreline Width over
39、pin head to centreline Width over rivet to centreline Chain plate thickness Measuring force Pin heat treated All heat treated ISO chain number p ad 1max. b 1min. d 2max. d 3min. h 1max. h 2max. l 1min. l 2min. l 3max. l 4max. b 2max. b 3min. b 4max. b 5max. b 6max. c nom. min. min. mm kN W78 66,27 2
40、2,9 28,4 12,78 12,9 30 28,4 16,5 17 16,8 16,8 51 51,6 45,2 39,6 42,7 6,4 0,9 93 107 W82 78,1 31,5 31,8 14,35 14,48 33,5 31,8 19,8 21,1 19,6 20,8 57,4 57,9 48,3 41,7 45,2 6,4 1,33 100 131 W106 152,4 37,1 41,2 19,13 19,25 39,6 38,1 22,9 27,2 26,4 26,9 71,6 72,1 62,2 56,4 59,4 9,6 1,78 169 224 W110 152
41、,4 32 46,7 19,13 19,25 39,6 38,1 22,9 27,2 26,4 26,9 76,5 77 62,2 54,9 59,4 9,6 1,33 169 224 W111 120,9 37,1 57,2 19,13 19,25 39,6 38,1 22,9 27,2 22,6 26,9 85,6 86,4 69,8 63,5 64,3 9,6 1,78 169 224 W124 101,6 37,1 41,2 19,13 19,25 39,6 38,1 22,9 27,2 22,6 26,9 71,6 72,1 62 56,4 59,4 9,6 1,78 169 224
42、 W124H 103,2 41,7 41,2 22,3 22,43 52,3 50,8 28,2 30,5 27,9 30,2 76,5 77 70,6 62,5 65,8 12,7 3,11 275 355 W132 153,67 44,7 69,85 25,48 25,6 52,3 50,8 30 30,5 30 30,2 111,8 112,3 88,1 79,2 83,3 12,7 3,11 275 378 W855 153,67 44,7 69,85 28,57 28,78 65 63,5 37,1 38,1 36,5 37,8 118,64 118,87 94,5 84,8 88,
43、9 15,87 4,44 552 a The pitch, p, is a theoretical reference dimension used in the calculation of chain lengths and sprocket dimensions, and is not intended for use in the inspection of individual links. BSISO6972:20026 4 Attachments 4.1 Types This International Standard specifies eight types of atta
44、chment designated A1, A2, A22, F2, F4, K1, K2 and W1 with the following characteristics: A1, A2 and A22 have a mounting plate, with mounting holes, attached parallel to the pitch line on one cranked plate, as shown in Figures 4, 5 and 6; F2 and F4 have an angle section, with mounting hole, attached
45、to the edge of each cranked plate, as shown in Figures 7 and 8; K1 and K2 have mounting plates, with mounting holes, attached parallel to the pitch line on both cranked plates, as shown in Figures 9 and 10; W1 has an angle section attached to the outer face of each cranked plate, as shown in Figure
46、11. 4.2 Dimensions The respective dimensions of the attachments shall be as specified in Tables 2 to 9. NOTE The actual form of the attachments is at the discretion of the manufacturer. aHole for d 4bolt. bFor this dimension, see Table 1. Figure 4 A1 attachment BSISO6972:2002 7Table 2 Dimensions of
47、A1 attachment Dimensions in millimetres ISO chain number b 7l 6l 7max.h 3max.b 10max.c 2l 5Bolt diameter d 4 aW78 50,8 31,8 36,6 22,4 65 6,4 16,8 9,7 W82 53,3 38,1 46 23,9 71,4 6,4 20,3 9,7 aThe actual hole diameter shall be large enough to provide adequate clearance for the specified bolt diameter.
48、 a Hole for d 4bolt. b For this dimension, see Table 1. Figure 5 A2 attachment Table 3 Dimensions of A2 attachment Dimensions in millimetres ISO chain number b 7l 6l 7max.l 8h 3max.b 10max.c 2l 5Bolt diameter d 4 aW78 50,8 38,9 52,3 28,4 22,4 65 6,4 16,8 9,7 W82 54,1 52,3 62 33,3 23,9 71,4 6,4 20,3
49、9,7 W110 67,6 98,6 84,1 44,4 30 84,1 9,7 23,1 9,7 W111 79,5 89,9 90,4 58,7 30 96,8 9,7 23,1 12,7 W124 66,8 71,4 77,7 49,3 30 90,4 9,7 23,1 9,7 W124H 66,8 73,2 80,8 49,3 39,6 82,8 12,7 28,4 12,7 W132 95,2 111,3 106,2 69,8 39,6 117,3 12,7 30,2 12,7 aThe actual hole diameter shall be large enough to provide adequate clearance for the specified bolt diameter. BSISO6972:20028 aHole for d 4bolt. bFor this dimension, see Table 1. Figure 6 A22 attachment Table
