1、BRITISH STANDARD BS 3876-5: 1990 Rope rollers, pulleys, mountings and assemblies for colliery track haulage Part5: Specification for suspended pulley assemblies and clamps UDC 622.33.005:622.625.5:622.673.3:006.3/.8BS3876-5:1990 This British Standard, having been prepared under the directionof the M
2、ining and Quarrying Requisites StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 30June1990 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MQE/18 Draft for comment88/74304 DC ISBN 0 580 17992 3 Co
3、mmittees responsible for this British Standard The preparation of this British Standard was entrusted by the Mining and Quarrying Requisites Standards Policy Committee (MQE/-) to Technical Committee MQE/18, upon which the following bodies were represented: Association of British Mining Equipment Com
4、panies British Foundry Association British Steel Industry Federation of Wire Rope Manufacturers of Great Britain Health and Safety Executive Institution of Mining Electrical and Mining Mechanical Engineers Amendments issued since publication Amd. No. Date CommentsBS3876-5:1990 BSI 11-1999 i Contents
5、 Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 General 1 4 Design considerations 1 5 Dimensions and shape of pulley components and mountings 1 6 Materials 3 7 Manufacture 5 8 Type testing 5 9 Marking 5 Appendix A Information to be supplied by the purchaser 6
6、Appendix B Information to be provided by the supplier 6 Appendix C Methods of testing suspended pulley assemblies and clamps 7 Appendix D General recommendations for the design and operating criteria of pulley assemblies 7 Appendix E Typical clause relating to inspection that the purchaser may choos
7、e to write into his order or contract for the supply of pulley assemblies and clamps to this Part of BS3876 10 Figure 1 Permitted minimum angular movement of suspended pulley assemblies 2 Figure 2 Typical horizontal spindle pulley 4 Figure 3 Testing of a pulley for run-out 4 Figure 4 Test forces for
8、 suspended pulley assemblies and clamps 6 Figure 5 Relationship between rope tension and resultant force on the pulley wheel 8 Figure 6 Relationship between rope speed and roller speed (r/min) 9 Table 1 Dimensions of horizontal spindle pulleys 3 Table 2 Bearing characteristics and designations 3 Pub
9、lications referred to Inside back coverBS3876-5:1990 ii BSI 11-1999 Foreword This Part of BS3876 has been prepared under the direction of the Mining and Quarrying Requisites Standards Policy Committee. The other Parts in the revised edition of BS3876, are as follows: Part1: Specification for paralle
10、l barrel rollers, mountings and assemblies; Part2: Specification for vertical spindle pulleys, mountings and assemblies; Part3: (Withdrawn); Part4: (Withdrawn). In the revised Parts, the following points should be noted: a) tapered rollers, which were covered in BS3876-2:1965, are now omitted from t
11、he revised Part2; b) vertical rollers, which were included in the1965 edition of Part2, are now omitted as it is considered that the parallel barrel rollers specified in Part1 can be used in the vertical mode; c) horizontal spindle pulleys, covered in the1965 edition of Part2, are relocated in Part5
12、 of the revised edition; d) Part3:1965 has been withdrawn because there is no longer any requirement for rollers with non-metallic rope bearing surfaces; e) the requirements for mountings for parallel barrel rollers, previously specified in BS3876-4:1966, have been revised and incorporated into the
13、expanded edition of Part1; there is therefore no need for retention or revision of a separate Part4. During the preparation all dimensions have been metricated and these are not necessarily straight conversions from the imperial dimensions previously adopted. Product certification. Users of this Bri
14、tish Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as
15、to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not
16、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 front cover, an inside fro
17、nt cover, pagesi andii, pages1 to10, an inside back cover 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.BS3876-5:1990 BSI 11-1999 1 1 Scope This Part of BS3876 sp
18、ecifies requirements for suspended pulley assemblies and clamps intended for use in colliery track haulage. This Part applies to: a) suspended pulleys, supplied and used with or without mountings, that are intended for the support of haulage ropes and which may be used in rope haulage ancilliary equ
19、ipment, e.g.weight ropes on safety equipment, haulage rope tensioning equipment, etc.; b) mountings; c) suspended pulley assemblies that comprise the pulleys and mountings; d) clamps for suspending assemblies from supporting members. The suspended pulleys to which this Part applies are not intended
20、to be used where rope deflections in excess of10 across a single pulley are required. Where rope deflections in excess of10 per pulley are required, pulleys in accordance with BS4878 should be used. NOTE 1Appendix A gives the information which should be supplied by the purchaser, in his enquiry and/
21、or order for pulleys, mountings and assemblies in accordance with this Part of BS3876. NOTE 2Appendix B gives the information that will be required by the purchaser, to be provided by the supplier, prior to the supply of pulleys, mountings and assemblies in accordance with this Part of BS3876. NOTE
22、3Appendix D gives general recommendations for the design and operating criteria for suspended pulleys. NOTE 4No inspection requirements are specified in this Part of BS3876. However, a typical requirement that a purchaser may choose to write into his order or contract for pulleys, mountings and asse
23、mblies to this Part is given in Appendix E. NOTE 5The titles of the publications referred to in this Part of BS3876 are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS3876 the following definitions apply. 2.1 barrel that part of the pulley on which the rope runs 2.
24、2 pulley a drum having a curved or U-shaped barrel, complete with spindle and bearings 2.3 mounting the frame to which the pulley is, or is to be, attached 2.4 pulley assembly the pulley and its mounting 2.5 clamp means for securing the pulley assembly to a supporting member NOTEThe supporting membe
25、r will typically be manufactured from a rolled steel joist to BS4-1, having a flange width varying between75mm and127mm, as indicated in Figure 1. 3 General The pulley components, mountings and clamps shall comply with the requirements specified in clauses4 to9 as appropriate. The design of pulley s
26、hall be such that it is a fixture in the mounting, with the bearings being contained within the pulley. 4 Design considerations The mounting shall not be supported by the clamping fastener see Figure 1b). The use of hooks, or “J” bolts for the clamping fasteners shall not be permitted. The pulley as
27、sembly shall move freely within the minimum angular limits shown in Figure 1 when subjected to the safe working load of the pulley assembly see clause9 c). All screw threads shall be in accordance with BS3643-1. 5 Dimensions and shape of pulley components and mountings 5.1 Dimensions The dimensions
28、of the pulleys shall be as given in Table 1. NOTE 1For convenience, a typical pulley is illustrated in Figure 2 which identifies the dimensions referred to in Table 1. The profile of the pulley barrel shall be curved or U-shaped having a minimum depth d (see Figure 2) of1.25 times the nominal diamet
29、er of the largest rope for which the pulley is designed to operate and have a radius at the barrel at least1mm greater than the nominal radius of that rope. NOTE 2Spindle ends may be plain, shouldered and threaded or otherwise machined to provide a suitable method of fixing the spindle in the pulley
30、 mounting. Mountings shall be designed to accept pulleys which have been designed to the dimensions given in Table 1.BS3876-5:1990 2 BSI 11-1999 NOTEThis figure does not purport to show design details. Figure 1 Permitted minimum angular movement of suspended pulley assemblies (see clause4)BS3876-5:1
31、990 BSI 11-1999 3 Table 1 Dimensions of horizontal spindle pulleys (see also Figure 2) 5.2 Eccentricity of the pulley barrel When a pulley supported on V blocks (see Figure 3) is rotated one revolution the radial run-out shall not exceed2mm for pulleys of nominal barrel diameter up to and including1
32、50mm and2.5mm for pulleys greater than150mm barrel diameter; the measurement being normal to the surface at any point between the limits Y-Y. 6 Materials 6.1 General Subject to the requirements of6.2 the materials used in the construction of the pulley assemblies and clamps shall be in accordance wi
33、th6.3 and6.4 respectively. 6.2 Light metals In the construction of the pulleys, assemblies and clamps no metal shall be used that contains more than: a) 15%(m/m) in total of aluminium, magnesium and titanium; and b) 6%(m/m) in total of magnesium and titanium. Paint and coatings containing any of the
34、 metals aluminium, magnesium and titanium shall not be used. 6.3 Materials for pulleys 6.3.1 Pulley barrels Pulley barrels shall be made from one of the following materials. a) Spheroidal graphite iron having a minimum hardness of200HB throughout any section. b) Carbon steel in accordance with BS310
35、0, steel A3. c) Low alloy(1% chromium) steel in accordance with BS3100, steel BW4. 6.3.2 Spindles Spindles shall be made from wrought steel in accordance with BS970 grade070M20, with a minimum tensile strength of430N/mm 2 . 6.3.3 Bearings Bearings shall be double sealed, grease filled, single row ra
36、dial ball beatings in accordance with BS292-1. NOTE 1The use of seize-resistant bearings having polyamide cages is preferred. The types of bearings to be used for each application shall be as given in Table 2. The bearings shall be sealed on both sides with an elastomeric material suitably reinforce
37、d. NOTE 2Plain metal covers are not sufficient. The polyamide cages, where fitted, and the elastomeric sealing material shall meet the fire resistance requirements of BS3790 and the antistatic requirements of BS2050. Table 2 Bearing characteristics and designations Pulley reference Barrel tread diam
38、eter, A ( 10mm) Barrel width, B (max.) Spindle length, D (max.) Barrel outside diameter, E (max.) Spindle adiameter, C Boss diameter, G 1 (max.) Boss diameter, G 2 (min.) mm mm mm mm mm mm mm SP1 100 100 200 225 20 75 60 SP2 150 125 250 275 20 75 60 SP3 200 150 250 325 25 90 80 SP4 250 175 275 375 2
39、5 90 80 SP5 300 200 300 425 25 90 80 a For tolerances, see7.3. Pulley reference Pulley speed Bearing designation SP1 r/min up to800 6204-2RS SP2 over800 6304-2RS SP3 SP4 SP5 up to800 6205-2RS over800 6305-2RSBS3876-5:1990 4 BSI 11-1999 NOTEThis figure does not purport to show design details. All dim
40、ensions are in millimetres. Figure 2 Typical horizontal spindle pulley Figure 3 Testing of a pulley for run-outBS3876-5:1990 BSI 11-1999 5 6.4 Materials for mountings and clamps Mountings and clamps shall be fabricated from steel in accordance with either of the following: a) carbon steel in accorda
41、nce with BS970, grade070 M20; or b) weldable structural steel in accordance with BS4360, grade43A. 7 Manufacture 7.1 General The pulley assemblies and clamps shall comply with7.2 and7.3. NOTEIt is important that: a) all pulley assemblies and clamps should be free from harmful defects; b) the barrels
42、 of pulleys should be smooth and free from all projections cross-jointing and defects that may be injurious to ropes; c) all machined parts should be free from sharp corners, edges and undercuts, tool marks and scoring that are likely to cause excessive concentrations of stress; d) all welds should
43、be free from the imperfections described in section6 of BS499-1:1983 and all defects (e.g.rough edges, weld spatter) likely to be injurious to persons or equipment, or to interfere with mating parts, should be removed. The attention of the supplier is drawn to the fact that the purchaser may reject
44、pulleys, assemblies and clamps as being unsatisfactory on any of these grounds, notwithstanding that the requirements of this Part of BS3876 are complied with, subject to discussion in accordance with normal commercial practice. 7.2 Welding Welding techniques shall be in accordance with BS5135. NOTE
45、 1Details of each welded joint should be agreed between the supplier and the purchaser and shown in detailed drawings, copies of which are held by both the supplier and the purchaser see Appendix Be). NOTE 2Minor defects in castings, that will not affect the mechanical strength or performance of the
46、 pulley barrel, may be rectified by welding when the manufacturer is able by so doing to provide a satisfactory casting. When repairs to cast steel are to be undertaken, then they shall be in accordance with BS4570. 7.3 Machining tolerances The machining tolerances for the outer diameter of the bear
47、ing shall be M7 and the machining tolerances on the spindle diameter shall be g6, as specified in BS4500-1. 8 Type testing Each type of pulley assembly, together with its corresponding clamps, shall be type tested in accordance with Appendix C. 9 Marking Each pulley, mounting and clamp shall be mark
48、ed with an etched, stamped or cast identity, giving the following information which shall be readily visible during normal operation: a) the manufacturers name, identification mark or trade mark; b) the number of this Part of this British Standard, i.e.BS3876-5 1) ; c) the safe working load (SWL) (s
49、eeC.2); d) in the case of mountings and clamps, the reference number of the pulley for which it is intended for use (see Table 1); e) also in the case of clamps, the nominal flange width(s) in millimetres to which it can be fitted unless the design of such arrangements is such as to be capable of being fitted to all flange widths in the nominal size range75mm to127mm. For the purpose of item c), SWLs of less than1000kg shall be marked in kilograms to the nearest whole kilogram. SWLs of1000kg or more shall be marked in tonnes (which
