1、BRITISH STANDARD BS6849:1987 ISO6973:1986 Specification for Drop-forged rivetless chains for conveyors UDC 621.867.1.055BS6849:1987 This BritishStandard, having been prepared under the directionof the Machinery and Components Standards Committee, was published underthe authority of the BoardofBSI an
2、d comes into effect on 30June1987 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference MCE/1 Draft for comment85/78566 DC ISBN 0 580 15966 3 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Machin
3、ery and Components Standards Committee (MCE/-) to Technical Committee MCE/1 upon which the following bodies were represented: British Industrial Truck Association Institution of Mechanical Engineers Mechanical Handling Engineers Association National Association of Drop Forgers and Stampers Precision
4、 Chain Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS6849:1987 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Chains 1 Figure 1 Chain assembly 1 Figure 2
5、 Chain dimensions 3 Table 1 Chain dimensions, measuring loads and ultimate tensile loads (Inch-pound units) 4 Table 1M Chain dimensions, measuring loads and ultimate tensile loads (Metric units) 4BS6849:1987 ii BSI 12-1999 National foreword This BritishStandard has been prepared under the direction
6、of the Machinery and Components Standards Committee and specifies the characteristics of drop forged rivetless chains which are suitable for conveyor applications. It is identical with ISO6973:1986 “Drop-forged rivetless chains for conveyors” published by the International Organization for Standardi
7、zation (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is drawn especially to the
8、 following. The comma has been used as a decimal marker for metric units. InBritishStandards it is current practice to use a full point on the baseline as thedecimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “BritishStandard”. A Br
9、itish 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. Summary of pages This document comprises a fr
10、ont cover, an inside front cover, pagesi andii, pages1 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6849:1987 BSI 12-1999 1 0 Introduction American Nationa
11、l Standard, ANSI B29-22M, deals with three types of rivetless chain, i.e.“regular”, “X” and “modified X” types. This International Standard deals with chains similar to the “X” type with an assured dimension on the centre link similar to the “modified X” type. The chains specified in this Internatio
12、nal Standard are intended to be used in place of all three types of ANSI chains. By adhering to the dimensions specified in this International Standard, it is possible to ensure that parts of chains of different origins can be joined together. It should be noted, however, that the pin should be of t
13、he same origin as the side bars. It is recognized that methods other than “drop”-forging may be used to manufacture these chains, e.g.air, steam, press or other forging methods. The dimensions specified in this International Standard are shown in inches and millimetres; the latter are conversions of
14、 the basic inch dimensions. 1 Scope and field of application This International Standard lays down the dimensions, tolerances, measuring loads and minimum breaking loads, for drop-forged rivetless chains suitable for conveyor applications under a variety of conditions. 2 Chains 2.1 Nomenclature The
15、nomenclature of the chains is indicated in Figure 1. Figure 1 illustrates the chain components. 2.2 Designation Drop-forged rivetless chains are designated by the prefix “F” followed by a number, e.g.348, which indicates the reference, not actual, pitch in inches, i.e.3in, and the nominal diameter o
16、f the pin, i.e.4/8in or1/2in. 2.3 Construction A chain is assembled from three basic parts, each of forged manufacture (see clause0), having a precise dimension on the centre link for securing an attachment (seeFigure 1). The centre link is joined to the two outside bars, which are symmetrical, by a
17、 tee-headed pin. Assembly is made by moving the pin and side bars forward to the midpoint of the centre link and rotating the assembly90 . 2.4 Dimensions Chains shall conform to the dimensions given in Table 1 and Table 1M. Maximum and minimum dimensions are specified to ensure that chain elements m
18、anufactured by different makers can be joined together. They represent limits for inter-changeability but are not the actual tolerances that should be used in manufacture. NOTEThe dimensions given in Table 1 and Table 1M are illustrated in Figure 2. Pitch, p, is a theoretical dimension used in calcu
19、lating strand lengths and chain wheel dimensions; it is not intended for inspection of individual links. Pitch, p (not the reference pitch), is used with the tolerances indicated to describe chain characteristics and length. 2.5 Finish Sharp edges and protrusions shall be absent from the pin seating
20、 and driving face areas of the centre link. 2.6 Minimum ultimate tensile strength The test length shall have a minimum of four free pitches. The ends shall be attached to the tensile testing machine fixtures by a pin through the space in the centre link on one end and through the holes of the outer
21、sidebars, or through the centre link if five free pitches are used. The fixtures shall be so designed as to allow universal movement; the actual method to be used is left to the discretion of the manufacturer. Tests in which failures occur adjacent to the fixtures shall be disregarded. The minimum t
22、ensile breaking loads shall be those given in Table 1 and Table 1M. Figure 1 Chain assemblyBS6849:1987 2 BSI 12-1999 2.7 Length accuracy Finished chains shall be measured either dry or after only light lubrication. The standard measuring length is given in Table 1 and Table 1M for each size. The cha
23、in shall be supported throughout its entire length and the measuring load given in Table 1 and Table 1M applied. The measured length shall be the standard measuring length within the limits of the tolerances given in Table 1 and Table 1M. 2.8 Marking The chain should be marked with a) the manufactur
24、ers name or trademark; b) the ISO chain number (see2.2).BS 6849:1987 BSI 12-1999 3 Figure 2 Chain dimensionsBS 6849:1987 4 BSI 12-1999 Table 1 Chain dimensions, measuring loads and ultimate tensile loads (Inch-pound units) Table 1M Chain dimensions, measuring loads and ultimate tensile loads (Metric
25、 units) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ISO chainNo. Reference pitch Theoretical pitch Width of centre link opening Pin diameter Chain height Chain width over pins Side bar thickness Centre link width (primary) a Centre link width (secondary) Width between side bars Centre link mounting
26、 face Ultimate tensile load Standard measuring length Measuring load p h 7 min. d 2 max. h 2 max. b 4 max. c nom. b 2 0,015 b 12 max. b 3 min. l 6 min. min. min. max. min. number of pitches in in in in in in in in in in in degrees lbf in in lbf F228 F348 F458 F678 2 3 4 6 2.010 3.015 4.031 6.031 0.2
27、9 0.53 0.66 0.95 0.26 0.50 0.64 0.88 0.71 1.10 1.46 2.05 1.09 1.85 2.28 3.15 0.25 0.40 0.47 0.71 0.47 0.74 1.00 1.28 0.37 0.52 0.65 0.84 0.51 0.79 1.03 1.35 1.59 2.31 3.34 9 9 9 5 6000 22000 42000 72000 121.86 121.90 121.91 121.37 120.10 120.10 120.56 120.27 60 40 30 20 100 100 200 300 a Each centre
28、 link shall be symmetrical so that dimension b 2is relatively equal at each end. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ISO chain No. Reference pitch Theoretical pitch Width of centre link opening Pin diameter Chain height Chain width over pins Side bar thickness Centre link width (primary) a
29、Centre link width (secondary) Width between side bars Centre link mounting face Ultimate tensile load Standard measuring length Measuring load p h 7 min. d 2 max. h 2 max. b 4 max. c nom. b 2 0,4 b 12 max. b 3 min. l 6 min. min. min. max. min. number of pitches mm mm mm mm mm mm mm mm mm mm mm degre
30、es daN mm mm daN F228 F348 F458 F678 50 75 100 150 51,1 76,6 102,4 153,2 7,4 13,5 16,8 24,1 6,6 12,7 16,2 22,3 18,0 28,0 37,0 52,0 27,7 47,0 58,0 80,0 6,4 10,2 12,0 18,0 11,9 18,8 25,4 32,5 9,4 13,2 16,5 21,3 13,0 20,1 26,2 34,3 40,4 58,7 84,8 9 9 9 5 2700 9800 18700 32000 3095,2 3095,2 3096,5 3082,
31、8 3050,5 3050,5 3062,2 3054,9 60 40 30 20 45 45 90 135 a Each centre link shall be symmetrical so that dimension b 2is relatively equal at each end.blankBS6849:1987 ISO6973:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible f
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