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本文(BS 6620-1-1992 Industrial plate screens - Guide for screens of thickness 3 mm and above《工业板筛 第1部分 厚度为3 mm和以上的筛子使用指南》.pdf)为本站会员(towelfact221)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

BS 6620-1-1992 Industrial plate screens - Guide for screens of thickness 3 mm and above《工业板筛 第1部分 厚度为3 mm和以上的筛子使用指南》.pdf

1、BRITISH STANDARD BS 6620-1: 1991 ISO 7805-1: 1984 Industrial plate screens Part 1: Guide for screens of thickness3mm and aboveBS6620-1:1991 This British Standard, having been prepared under the directionof the General Mechanical Engineering Standards Policy Committee, waspublished under the authorit

2、yof the Standards Boardand comes into effect on 31 January 1992 BSI 10-1999 First published as BS6620 September1985 Second edition as BS6620-1 January1992 The following BSI references relate to the work on this standard: Committee referenceGME/29 Draft for comment 83/72051DC ISBN 0 580 20391 3 Commi

3、ttees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/29, upon which the following bodies were represented: BCIRA British Aggregate Construction Materials

4、Industries British Ceramic Society British Laboratory Ware Association Cement and Concrete Association Cement Makers Federation Coated Abrasives Manufacturers Association Department of Trade and Industry (Warren Spring Laboratory) Department of Transport (Highways) Guild of Metal Perforators Incorpo

5、rated National Association of British and Irish Millers Institution of Chemical Engineers Institution of Mining and Metallurgy Mechanical Handling Engineers Association Ministry of Defence National Coal Board Society of Chemical Industry Woven Wire Association The following body was also represented

6、 in the drafting of the standard, through subcommittees and panels: Minerals Engineering Society Amendments issued since publication Amd. No. Date CommentsBS6620-1:1991 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of ap

7、plication 1 2 References 1 3 Definitions 1 4 Material and design 1 5 Tolerances 2 6 Testing 2 7 Designation 3 Annex Examples 4 Figure 1 Round holes:60 staggered arrangement 1 Figure 2 Square holes: in-line arrangement 2 Figure 3 Square holes: half-pitch staggered arrangement 2 Table 1 Pitch/hole rat

8、ios and related open areas 2 Table 2 Examples of round hole perforations at60 stagger inindustrialplatescreens 4 Table 3 Examples of square hold perforations in industrial plate screens 5 Table 4 Examples of tolerances on pitch 5 Publication(s) referred to Inside back coverBS6620-1:1991 ii BSI 10-19

9、99 National foreword This Part of BS6620 has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee and is identical withISO7805-1:1984 “Industrial plate screens Part 1: Thickness of3mm and above” published by the International Organization for Standardiza

10、tion (ISO). ISO7805-1 was prepared byISO/TC24 in which the UK took an active part. BS6620-1:1991 supersedes BS6620:1985, which is withdrawn. The difference between the two editions is that the standard has been renumbered to align it with BS6620-2:1991. No other change has been made. The Technical C

11、ommittee has reviewed the provisions of ISO2194, ISO2395, ISO3310-2 and ISO7805-2, to which reference is made in the text, and has decided that they are suitable for use in conjunction with this standard. ISO 2194 and ISO3310-2 are related to BS410 “Specification for test sieves” and ISO2194 is also

12、 related to BS481 “Specification for industrial wire mesh” Part2 “High tensile steel wire mesh with square apertures from125mm to2mm”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

13、Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references InternationalStandard Corresponding British Standard ISO 3:1973 BS 2045:1965 Preferred numbers (Technically equivalent) ISO 7805-2:1987 BS 6620 Guide for industrial plate screens Part 2:199

14、1 Thickness below3mm (Identical) ISO 7806:1983 BS 6511:1984 Specification for designation of perforations in industrial plate screens (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1to6, an inside back cover and a back cover. This standa

15、rd 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.BS6620-1:1991 BSI 10-1999 1 0 Introduction The purpose of this InternationalStandard is to provide guidance for the development of national stand

16、ards for industrial plate screens. 1 Scope and field of application This part of ISO7805 describes three patterns using round (circular) and square perforations in low carbon steel plate of3mm thickness and above; the sizes of holes ranging from125 to3,15mm inclusive. Five ratios of pitch to hole ar

17、e prescribed which result in nominal areas ranging from about64 to23%. Tolerances for both hole and pitch are given. As this part of ISO7805 provides a diversity of choice, it is unlikely that every one of the many possible combinations of size of hole, pitch and plate thickness will be manufactured

18、. The selection for national standards for industrial plate screens should be made from those combinations which suit the products and screening methods in the country concerned. Industrial plate screens of thicknesses below3mm are dealt with in ISO7805-2. 2 References ISO 3, Preferred numbers Serie

19、s of preferred numbers. ISO 2194, Wire screens and plate screens for industrial purposes Nominal sizes of apertures. ISO 2395, Test sieves and test sieving Vocabulary. ISO 3310-2, Test sieves Technical requirements and testing Part2: Metal perforated plate. ISO 7805-2, Industrial plate screens Part2

20、:Thickness below3mm 1) . ISO 7806, Industrial plate screens Codification for designating perforations. 3 Definitions For the purpose of this InternationalStandard the definitions given in ISO2395 and the following definition apply. open area ratio of the total area occupied by the holes to the overa

21、ll area of the perforated part of the plate 4 Material and design 4.1 Material The following requirements apply to perforated plates of low-carbon steel. Plates made of other steels and non-ferrous metals may require different specifications apart from sizes of holes. 4.2 Design 4.2.1 Arrangement of

22、 holes Three permissible arrangements of holes are illustrated inFigure 1 toFigure 3; Figure 1 for round holes in an equilateral triangle(60staggered) arrangement;Figure 2 andFigure 3 for square holes in line or at half pitch stagger. 4.2.2 Size of holes w The nominal sizes of round or square holes

23、in industrial plate screens are tabulated in ISO2194. First choice shall be made from the R10 series of preferred numbers, the second choice from theR20series. If necessary, choice may be made from the R40series. NOTEThe R10series of sizes is shown, by way of example, inTable 2 andTable 3. 1) At pre

24、sent at the stage of draft. Figure 1 Round holes:60 staggered arrangement (i.e. at the apices of equilateral triangles) Open area . 0,9 (w/p) 2 BS6620-1:1991 2 BSI 10-1999 4.2.3 Pitch p Values for pitch shall be calculated from the five options of pitch/hole ratio given inTable 1 which tabulates the

25、 approximate open area in percent for round and square hole perforations based on these ratios. The calculated values shall be rounded to the nearest R40number according to ISO3. Table 1 Pitch/hole ratios and related openareas 4.2.4 Plate thickness Plate thickness before perforation shall be agreed

26、by purchaser and supplier. A chosen thickness shall normally be less than the size of holes and also less than the bridge width (bar). 5 Tolerances Formulae for tolerances are given in5.1 to5.3; they apply to unused plate screens. 5.1 Tolerance on average size of hole %w The average measured size of

27、 hole shall not deviate from the nominal value by more than the value given by the formula where %w and w are given in millimetres. 5.2 Tolerance on average pitch %p The average measured pitch shall not deviate from the nominal value by more than the value given by the formula where %p and p are giv

28、en in millimetres. 5.3 Tolerance on individual pitch The measured value of any individual pitch shall not deviate from the nominal value by more than2%p. NOTEExamples are listed inTable 2 andTable 3 for tolerances on average size of hole and inTable 4 for tolerances on average pitch. 6 Testing Measu

29、rements of size of holes and pitch in perforated plate shall be made at the punch side of the plate as described in tests2 and3 of ISO3310-2. Figure 2 Square holes: in-line arrangementOpen area = (w/p) 2 Figure 3 Square holes: half-pitch staggeredarrangement Open area = (w/p) 2 Pitch/hole ratio Appr

30、oximate open area round holes square holes p/w % % 1,25 1,4 1,6 1,8 2 58 46 35 28 23 64 51 39 31 25 NOTEExamples inTable 2 andTable 3 include pitch selections. . . .(1) . . .(2)BS6620-1:1991 BSI 10-1999 3 7 Designation Industrial plate screens shall be designated by shape of holes; size of holes; ar

31、rangement and orientation of holes; pitch of holes. The above items of designation can be described by use of the code specified in ISO7806. NOTEThe customers choice of plate thickness, shape and size of plate, and the required material should be clearly stated when ordering an industrial plate scre

32、en.BS6620-1:1991 4 BSI 10-1999 Annex Examples (This annex forms part of the Standard.) Table 2 andTable 3 are examples which list sizes of holes in theR10 series and include hole/pitch combinations which have been manufactured or suggested. The criteria for selection made for national standards is d

33、escribed in clause1. Table 2 Examples of round hole perforations at60 stagger in industrial plate screens Values in millimetres Hole Nominal pitch a p for an approximate open area of nominal size tolerance on average size w % w 58% 46% 35% 28% 23% 125 100 80 63 50 40 31,5 25 20 16 12,5 10 8 6,3 5 4

34、3,15 3 2,5 2,1 1,7 1,4 1,2 1 0,8 0,6 0,5 0,4 0,35 0,3 0,25 0,2 0,15 0,15 160 125 100 80 63 50 40 31,5 25 20 16 90 71 56 45 35,5 28 22,4 18 14 11,2 100 80 63 50 40 31,5 25 20 16 12,5 10 8 22,4 18 14 11,2 9 7,1 16 12,5 10 8 6,3 a For tolerances on pitch seeTable 4.BS6620-1:1991 BSI 10-1999 5 Table 3 E

35、xamples of square hole perforations in industrial plate screens Table 4 Examples of tolerances on pitch Values in millimetres Hole Nominal pitch a p for an approximate open area of nominal size tolerance on average size w % w 64% 51% 39% 31% 25% 125 100 80 63 50 40 31,5 25 20 16 12,5 10 8 6,3 5 4 3,

36、15 3 2,5 2,1 1,7 1,4 1,2 1 0,8 0,6 0,5 0,4 0,35 0,3 0,25 0,2 0,15 0,15 160 125 100 80 63 50 40 31,5 25 20 16 90 71 56 45 35,5 28 22,4 18 14 11,2 100 80 63 50 40 31,5 25 20 16 12,5 10 18 14 11,2 9 7,1 10 8 6,3 a For tolerances on pitch seeTable 4. Values in millimetres Nominal pitch Tolerance on aver

37、age pitch Nominal pitch Tolerance on average pitch p %p p %p 160 125 100 90 80 71 63 56 50 45 40 35,5 31,5 2,9 2,4 2 1,8 1,7 1,5 1,4 1,3 1,2 1,1 1 0,8 0,8 28 25 22,4 20 18 16 14 12,5 11,2 10 9 8 7,1 6,3 0,7 0,7 0,6 0,5 0,5 0,45 0,4 0,35 0,35 0,3 0,25 0,25 0,2 0,2 NOTEThe tolerance on any individual

38、pitch is twice that stated for average pitch.6 blankBS6620-1:1991 BSI 10-1999 Publication(s) referred to See national foreword.BS 6620-1: 1991 ISO 7805-1: 1984 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing Briti

39、shStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the

40、constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.

41、 Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Custome

42、r Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on n

43、ational, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscri

44、bing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications.

45、 BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopy

46、ing, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.

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