BS-490-10.3-1984.pdf
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1、BRITISH STANDARD BS 490-10.3: 1984 Conveyor and elevator belting Part 10: Testing for physical properties Section 10.3 Methods for measurement of overall thickness and cover thickness UDC 621.867.2.052:678.066:531.717.11 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:46:00 GMT+00:00 2006,
2、 Uncontrolled Copy, (c) BSI BS 490-10.3:1984 This British Standard, having been prepared under the direction of the Rubber Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 February 1984 BSI 10-1999 The Committees responsible for this British Stan
3、dard are shown in Section 10.1. The following BSI references relate to the work on this standard: Committee reference RUC/16 Draft for comment 82/55337 DC ISBN 0 580 13571 3 Foreword This Section of BS 490-10 has been prepared under the direction of the Rubber Standards Committee, and is part of a s
4、eries of standards detailing methods of test for conveyor and elevator belting. It is recommended that this Section should be read in conjunction with the information in the foreword to BS 490-10.1, published separately. In the preparation of this Section reference has been made to NCB Specification
5、 No. 158/1980. Consideration has also been given to the method described in ISO 583:1975 but this Section differs from the International Standard in the following ways. a) It is limited to methods of test and does not specify thickness tolerances. b) It contains an optical method which is not includ
6、ed in the International Standard. c) In the micrometer method of this British Standard a bench apparatus is used whereas ISO 583 specifies a hand held instrument. d) Although both BS and ISO micrometer methods require eight measurement points across the belt width, the BS method takes into account t
7、he cover thickness nearer to the belt edge than does the ISO method. 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. Compliance with a British Standard does not of itself confer immun
8、ity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, 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
9、amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:46:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 490-10.3:1984 BSI 10-1999i Contents Page ForewordInside front cover 1Scope1 2Defi
10、nitions1 3Method A (micrometer method)1 4Method B (optical method)2 Figure 1 Measurement of belt thickness according to method A2 Figure 2 Preparation of test piece for method B2 Figure 3 Measurement of cover thickness according to method B3 Publications referred toInside back cover Licensed Copy: s
11、heffieldun sheffieldun, na, Fri Dec 01 07:46:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:46:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 490-10.3:1984 BSI 10-19991 1 Scope This Section of this British Standard describes a proce
12、dure for measuring the overall belt thickness and provides two methods for measuring the individual cover thicknesses of the belt. Method A (micrometer method) is intended for measuring the total belt thickness and for the measurement of thickness of covers which can be removed completely from the b
13、elt carcass. Method B (optical method) is intended for use a) where the cover cannot be completely removed from the fabric carcass; b) where fabric is incorporated into the cover; c) where there is a requirement for minimum localized thickness; d) where the minimum thickness of the belt is to be mea
14、sured within 25 mm of the belt edges. NOTEThe titles of the publications referred to in this standard are listed on inside back cover. 2 Definitions For the purposes of this Section of this British Standard, the following definitions apply. 2.1 overall belt thickness the distance in millimetres betw
15、een the outer surfaces of the belt 2.2 cover thickness the amount of cover material measured in millimetres between the surface of the belt and the fabric carcass 3 Method A (micrometer method) 3.1 Principle. Measurement by micrometer of thickness of belt before and after removal of covers. Calculat
16、ion of cover thickness by difference. 3.2 Apparatus. The instrument for measuring belt thickness shall be a micrometer dial gauge firmly held in a rigid stand over a flat baseplate of width at least 100 mm. The gauge shall be graduated in divisions of 0.01 mm and shall comply with the relevant requi
17、rements of BS 907, including those relating to accuracy of calibration. The dial gauge shall be fitted with a flat contact of diameter 19 2 mm which shall be at right angles to the plunger and parallel to the baseplate. The working force at the contact surface, measured with the dial gauge in the ve
18、rtical position, shall be 0.50 0.20 N. 3.3 Test piece. The test piece shall be a 50 mm long piece of the belting cut across the full width of the belt, and cut from the full thickness of the belt including the covers. 3.4 Preparation of test piece. Cut the belt across its full width at right angles
19、to the surface and edges of the belt ensuring that the line of the cut is not within 50 mm of any embossed markings on the surface of the belt. 3.5 Procedure 3.5.1 Measurement of overall thickness. Using supports of the same height as the surface of the base plate, place the test piece under the dia
20、l gauge. Holding the test piece flat by means of finger pressure each side of the dial gauge presser foot, allow the pressure foot to come into contact with one of the positions indicated in Figure 1; read the dial gauge. Repeat the measurement at the other seven positions indicated in Figure 1. Rou
21、nd each measurement to two decimal places. 3.5.2 Measurement of thickness with carrying cover removed. Remove the cover on the carrying side completely and measure the thickness of the test piece at the same eight points, the values again being rounded to two decimal places. 3.5.3 Measurement of thi
22、ckness of carcass. Remove the pulley side cover completely and measure the thickness of the test piece (now carcass only) at the same eight points, the values again being rounded to two decimal places. NOTEAny protective fabric (embedded in the cover) which does not contribute to the tensile strengt
23、h of the belt should be considered as forming part of the cover and should therefore be removed with it. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:46:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 490-10.3:1984 2 BSI 10-1999 3.6 Expression of results. Let the average of the eight v
24、alues for overall thickness, obtained in 3.5.1, be h. Let the average of the eight values for one cover removed, obtained in 3.5.2, be h1. Let the average of the eight values for both covers removed, obtained in 3.5.3, be h2. Overall belt thickness is h. Thickness of carrying side cover is h h1. Thi
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