1、BRITISH STANDARD BS 8407:2002 Specification for mechanical and spliced joints in conveyor belting for use underground ICS 53.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 8407:2002 This British Standard, having been prepared under the direction of the Materials and
2、Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 May 2002 BSI 28 May 2002 The following BSI references relate to the work on this British Standard: Committee reference PRI/26 Draft for comment 00/124045 ISBN 0 580
3、33335 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/67, Conveyor belts, upon which the following bodies were represented: British Rubber Manufacturers Association Ltd Health and Safety Executive Institute of Mater
4、ials Tun Abdul Razak Research Centre UK Steel Association Amendments issued since publication Amd. No. Date CommentsBS 8407:2002 BSI 28 May 2002 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 1 4 Mech
5、anical fastener holding (applicable only to textile belting) 2 5 Spliced/vulcanized joints (applicable to textile and steel cord conveyor belts) 3 Annex A (normative) Dynamic life-test for joints made with mechanical fasteners 4 Annex B (normative) Static tensile test for spliced (vulcanized) joints
6、 8 Annex C (normative) Dynamic life-test for spliced (vulcanized) joints 9 Bibliography 10 Figure A.1 Symmetric geometry 6 Figure A.2 Asymmetric geometry 6 Figure A.3 Configuration of dynamic testing machine 7 Table 1 Belt test requirements (mechanical fasteners) 2 Table 2 Belt test requirements vul
7、canized (spliced) joints 3 Table A.1 Dimensions of pulley diameters and pulley centres for testing machine (see Figure A.3) relative to nominal belt strengths 7 Table A.2 Nominal loop lengths and speeds for pulley configurations 8BS 8407:2002 ii BSI 28 May 2002 Foreword This British Standard has bee
8、n prepared by PRI/67, Conveyor belting. For some years the industry has adopted informal specifications which have provided a satisfactory level of operational safety, but with the increased use and value of risk assessments a more formalized approach is necessary. This document is intended to be us
9、ed in conjunction with BS 3289 and British Coal Specification 730 until such time as these specifications are replaced by harmonized European Standards. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Complia
10、nce with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates wh
11、en the document was last issued.BS 8407:2002 BSI 28 May 2002 1 1 Scope This British Standard specifies requirements for joints made in conveyor belting for use underground. It specifies performance requirements for the following properties: joints made with mechanical fasteners (static strength); jo
12、ints made with mechanical fasteners (dynamic strength); joints made by chemical splicing/vulcanization (static strength); joints made by chemical splicing/vulcanization (dynamic strength). The methods of test to be used to validate the requirements are specified in the annexes. This standard is not
13、applicable or valid for light conveyor belts as specified in BS EN 873. NOTE Although this standard is intended to specify the requirements for conveyor belting, the test methods specified in 4.1.1 and 4.2.1 can also be used to assess the performance of mechanical fasteners when used with specific t
14、ypes of conveyor belting. For this reason, an alternative test configuration is specified in Annex A. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the la
15、test edition of the referenced document (including any amendments) applies. BS EN ISO 1120, Conveyor belts Determination of strength of mechanical fastenings Static test method. BS 3289, Specification for textile carcass conveyor belting for use in underground mines (including fire performance). BS
16、1610, Methods for the load verification of testing machines. 3 Terms and definitions For the purpose of this standard, the following terms and definitions apply: 3.1 fastener pitch the nominal distance between a point on a fastener unit and the corresponding point on the next fastener unit (see Figu
17、re A.1 and Figure A.2) 3.2 fastened width the number of fastener units inserted in one end of a test piece multiplied by the pitch (see Figure A.1 and Figure A.2) 3.3 nominal tensile strength the specified minimum value of the tensile strength of the conveyor belt, expressed in N/mm 3.4 joints the j
18、oining of individual lengths of conveyor belting to produce a longer length NOTE This should not be confused with transverse (or longitudinal) fabric joints made during the production process for multi-ply belting.BS 8407:2002 2 BSI 28 May 2002 4 Mechanical fastener holding (applicable only to texti
19、le belting) 4.1 Static tensile strength 4.1.1 Test method Belts up to and including Type 15 (2 650 N/mm) shall be tested in accordance with BS EN ISO 1120. 4.1.2 Requirement For new belting, the mean value obtained shall be not less than 60 % of the nominal tensile strength for belts of tensile stre
20、ngth up to and including 1 400 N/mm (Type 8), and not less than 50 % of nominal tensile strength for belts above 1 400 N/mm. 4.2 Dynamic life-test 4.2.1 Test method Belts up to and including Type 15 (2 650 N/mm), as defined in BS 3289:1990, shall be tested in accordance with Annex A. 4.2.2 Requireme
21、nts When tested in accordance with 4.2.1, belts of nominal tensile strength up to and including 2 650 N/mm (Type 15 as defined in BS 3289:1990) shall conform to Table 1. NOTE 1 The type of fastener specified in Table 1 is for test purposes only, and to allow a comparison of belt performance. The tab
22、le is not a list of approved or recommended fasteners. NOTE 2 Solid mild steel pins should be used, of appropriate diameter, as recommended by the fastener supplier. In line with good practice, belts of Type 12 and above would normally be vulcanized. Mechanical fasteners, if used, shall conform to t
23、he static tensile strength requirement specified in 4.1.2. Table 1 Belt test requirements (mechanical fasteners) Belt Pulley diameter mm Total loop length m Type of fastener No. of pieces in loop No. of test loops Minimum no. of cycles (mean of each piece in test loop) BC Spec 557 4 250 5.2 Type A 4
24、 2 75 000 Mato U35 BC Spec 557 5 455 10.5 Type A 4 2 75 000 Mato U35 Titan 1 6 610 12.0 MME Type C 6 1 100 000 Titan 1 8 610 12.0 MME Type C 6 1 100 000 Titan 1 10 800 13.5 MME Type C 6 1 100 000 Mato U37A Titan 1 12 800 13.5 MME Type C 6 1 100 000 Mato U38A 15 1 000 13.5 Mato U38 6 1 100 000 NOTE T
25、he pulleys in column 2 are the “break-back” pulleys. Refer to Table A.1 and Table A.2 for full configuration.BS 8407:2002 BSI 28 May 2002 3 5 Spliced/vulcanized joints (applicable to textile and steel cord conveyor belts) 5.1 Static tensile strength 5.1.1 Test method Belts up to and including those
26、of tensile strength 3 150 N/mm shall be tested in accordance with Annex B. 5.1.2 Requirements When tested in accordance with 4.1.1, the loop shall not break at less than 60 % of the belts nominal tensile strength for textile belting, and 70 % for steel cord belting. This shall apply to all belts up
27、to and including 3 150 N/mm. 5.2 Dynamic life-test 5.2.1 Test method Belts up to and including those of tensile strength 3 150 N/mm shall be tested in accordance with Annex C. 5.2.2 Requirements When tested in accordance with 5.2.1, textile belts up to and including Type 18 shall conform to Table 2.
28、 In addition to completing the required minimum number of cycles, the tested loop shall have a remaining tensile strength of not less than 50 % of nominal tensile strength. Steel cord belts shall complete 1 000 000 cycles and have a residual tensile strength of not less than 60 % of the nominal tens
29、ile strength of the belt. Table 2 Belt test requirements vulcanized (spliced) joints Belt type Tensile strength N/mm Pulley diameter mm Total loop length m Initial static tensile % Residual static tensile % Minimum no. of cycles (at 12.5 % tension) 4 700 250 4.5 60 50 100 000 5 875 455 4.5 60 50 100
30、 000 6 1 140 610 9.5 60 50 100 000 8 1 400 610 9.5 60 50 250 000 10 1 750 800 14.0 60 50 250 000 12 2 100 800 14.0 60 50 250 000 15 2 650 1 000 15.0 60 50 250 000 18 3 150 1 000 15.0 60 50 250 000 NOTE The pulleys in column 3 are the “break-back” pulleys. Refer to Table A.1 and Table A.2 for full co
31、nfiguration.BS 8407:2002 4 BSI 28 May 2002 Annex A (normative) Dynamic life-test for joints made with mechanical fasteners A.1 General The method is applicable to joints made with mechanical fasteners in textile belting having a nominal tensile strength of up to 2 650 N/mm (Type 15). A.2 Testing mac
32、hine A.2.1 The dimensions and layout of the testing machine shall be in accordance with Figure A.3 and Table A.1. One pulley shall be connected to a driving motor, through a gearbox, if necessary. The remaining pulleys shall be free to rotate. A.2.2 Means shall be provided for measuring the tension
33、in the belt through the force exerted by the belt on one of the pulleys. A.2.3 Means shall be provided for obtaining and maintaining the required tension in the belt, and for accommodating the changes in loop length that occur during the test. NOTE It is recommended that these functions are performe
34、d by traversing only one pulley, as shown in Figure A.3. A.2.4 Means shall be provided for stopping the testing machine when the test loop breaks. A.2.5 Means shall be provided for measuring the running time of the testing machine. A.3 Test tension The test tension in the conveyor belt throughout th
35、e test shall be 10 % 0.5 % of the nominal tensile strength of the conveyor belt in N/mm multiplied by the fastened width in metres. NOTE This corresponds to a normal service tension. A.4 Preparation of test pieces A.4.1 The number of cycles to be conducted, and the number of test pieces required for
36、 each test, is specified in Table 1. For each test, a further test piece may be required if the available take-up is exceeded during the course of the test. This additional test piece shall have the same width and shall be prepared from the same sample of belting but shall have a length of approxima
37、tely 1 000 mm. A.4.2 Test pieces shall be prepared not less than five days after the date of manufacture of the belt. A.4.3 The width of each test piece shall be the fastened width +50 mm, 1.5 mm. The fastened width will vary depending upon the pitch of the fastener used, but shall be as near as pos
38、sible to 250 mm. NOTE 1 The length of each test piece is obtained from the overall test loop length, and the number of test pieces in the loop. Each individual belt piece in the loop shall be clearly marked for identification purposes during the test. NOTE 2 During the preparation of test pieces, go
39、od craft practice in belt jointing should be observed and careful attention should be paid to the instructions of the fastener manufacturers. In particular, attention is drawn to the need for the open ends of the belting to be cleanly cut and perpendicular to the edge of the belting, before the inse
40、rtion of fasteners. A.5 Preparation of test loop A.5.1 The test pieces shall be joined by means of a fastener specified in Table 1 to form a test loop. A.5.2 Insert the number of fasteners (n) required to give the fastened width into one end of the test piece. At the opposite end of the test piece i
41、nsert n + 1 fasteners as shown in Figure A.1. This produces a symmetrical joint which aids tensioning and tracking, and also gives a degree of control over the position where failure is likely to occur. NOTE When this test method is being used to test fasteners other than those specified in Table 1,
42、 the configuration shown in Figure A.1 may not be practicable, in which case the configuration shown in Figure A.2 should be used. When this asymmetric configuration is used, the joint fastener arrangement shall be reversed at each successive joint to aid tracking and uniformity of tensioning.BS 840
43、7:2002 BSI 28 May 2002 5 A.6 Test method A.6.1 Assemble the test loop into the testing machine using connecting pins as specified in the configuration as shown in Figure A.3. A.6.2 Apply a tension approximately equal to half the test tension to the belt and start the testing machine. Gradually incre
44、ase test tension in the belt until the full test tension is attained. Measure the time for 20 cycles of the testing machine and calculate the time for one cycle. A.6.3 Continue the test without unnecessary interruption until one joint breaks. Record the time elapsed from the time the test machine wa
45、s started at A.6.2. Calculate the number of circuits of the testing machine completed by the broken joint and record this value as the joint life of the broken joint (see A.7). Record also details of the manner of failure of the joint. A.6.4 Remove the two halves of the broken joint by cutting a len
46、gth of 60 mm from the ends of the test pieces adjacent to the broken joints. Insert a replacement joint in the manner specified in A.5.2. A.6.5 Re-start the testing machine and measure the new cycle time as above. Continue the test until the next joint breakage occurs. Record the additional elapsed
47、time and the additional number of circuits of the testing machine. Calculate the total number of circuits of the testing machine endured by the joint at break and record the value as the life of that joint, also record details of the manner of failure of that joint. A.6.6 Continue the test until eac
48、h original joint has broken. If a second breakage occurs at any joint, re-join the test pieces and maintain the joint but keep no record of its life. Record details of the total number of circuits for each joint, also the manner of failure. A.6.7 If necessary (i.e. to maintain the test loop at the c
49、orrect length), insert the additional test piece at the junction between the two test pieces for which the joint life has already been recorded. No joint life shall be recorded for any joint connected to the additional test piece. A.7 Calculation and expression of results Calculate the mean joint life as the arithmetic mean of the observed values, using the following equation to calculate the individual joint life values. where A.8 Test report The test report shall include the following: a) belt type; b) mean joint life; c) type of joint
