1、BRITISH STANDARD BS 6911-9: 1993 ISO 10268: 1993 Testing earth-moving machinery Part 9: Verification of retarder capability of dumpers and tractor-scrapers UDC 621.878/.879:62-594BS6911-9:1993 This British Standard, having been prepared under the directionof Technical CommitteeB/513, was publishedun
2、der the authority ofthe Standards Board and comesinto effect on 15December1993 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference B/513/1 Draft for comment 93/11314 DC ISBN 0 580 22661 1 Committees responsible for this British Standard The preparation o
3、f this British Standard was entrusted by Technical Committee B/513, Construction equipment and plant, and site safety, to Subcommittee B/513/1, Earth-moving machinery, upon which the following bodies were represented: British Coal Corporation Construction Plant (Hire Association) Federation of Civil
4、 Engineering Contractors Federation of Manufacturers of Construction Equipment and Cranes Health and Safety Executive Institution of Civil Engineers Silsoe Research Institute Amendments issued since publication Amd. No. Date CommentsBS6911-9:1993 BSI 12-1999 i Contents Page Committees responsible In
5、side front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Test method 1 5 Facilities 1 6 Measurement accuracy 1 7 Test requirements 1 8 Verification test 2 9 Retarding performance presentation format 2 Annex A (informative) Example of use of retarding performance cha
6、rt 3 Annex B (informative) Bibliography 4 Figure A.1 Retarding capability 3 List of references Inside back coverBS6911-9:1993 ii BSI 12-1999 National foreword This Part of BS6911has been prepared under the direction of Technical Committee B/513, Construction equipment and plant, and site safety, and
7、 is identical with ISO10268:1993 Earth-moving machinery Retarders for dumpers and tractor-scrapers Performance tests, published by the International Organization for Standardization (ISO). ISO 10268 was prepared by Subcommittee 1, Test methods relating to machine performance, of ISO Technical Commit
8、tee127, Earth-moving machinery, with the active participation and approval of the UK. Annex A and Annex B of this British Standard are for information only. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their
9、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 3450:1985 BS 6824:1987 Specification for performance and test of braking systems for wheeled earth-moving mac
10、hinery (Identical) ISO 7132:1990 a BS 6914 Terminology (including definitions of dimensions and symbols) for earth-moving machinery Part 4:1990 Glossary for dumpers (Identical) ISO 7133:1985 a BS 6823:1987 Glossary of terminology and content of commercial specifications for tractor-scrapers used for
11、 earth-moving, and their equipment (Identical) ISO 9248:1992 BS 6911 Testing earth-moving machinery Part 7:1992 Specification for units of measurement and tolerances (Identical) a For information only (see Annex B). Summary of pages This document comprises a front cover, an inside front cover, pages
12、 i and ii, pages1 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 amendment table on the inside front cover.BS6911-9:1993 BSI 12-1999 1 1 Scope This International Standard specifi
13、es a test procedure for verifying the manufacturers published continuous retarding capability. It applies to dumpers, tractor-scrapers and other earth-moving machinery equipped with retarders. 2 Normative references The following standards contain provisions which, through reference in this text, co
14、nstitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions
15、of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3450:1985, Earth-moving machinery Wheeled machines Performance requirements and test procedures for braking systems. ISO 9248:1992, Earth-moving machinery Units for dimensions,
16、 performance and capacities, and their measurement accuracies. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 retarder energy absorption device normally used to control machine speed while descending grades 3.2 continuous retarding capability stea
17、dy-state energy absorption rate at which the stated critical parameters of the machines retarding system are stabilized and are not exceeded NOTE 1The critical parameters should be defined by the manufacturer. The critical parameters will depend upon the retarder system design. Examples of what migh
18、t be critical parameters are oil and coolant temperatures. 3.3 maximum continuous power value describing the maximum descend speed and rimpull force which can be obtained in the specified gear ratio when not exceeding the manufacturers specified engine speed 3.4 grade test course slope on which the
19、on-grade tests are run 4 Test method Satisfactory results from any one of the following methods may be used for verification: towing on-grade dynamometer 5 Facilities 5.1 Towing and on-grade verification tests The test course shall consist of a hard, dry surface (ground moisture may be present to th
20、e extent thatit does not adversely affect the friction characteristics of the surface) with a well compacted base. The course shall be of sufficient length, smoothness and uniformity of gradient to ensure themaintenance of the required test speed. Additionally, when using the towing test, the averag
21、e grade in the direction of travel shall be level(0% grade) within 1%. 5.2 Dynamometer test Driving equipment may consist of motors, motoring dynamometers or rolls which shall be used within their manufacturers stated range of limitations. 6 Measurement accuracy 6.1 Generally accuracy of measuring i
22、nstruments shall comply with ISO9248. 6.2 Additionally grade slope shall be determined within 0,5 . 7 Test requirements 7.1 The test shall be conducted with the retarding system and the machine fully serviced and adjusted to the manufacturers specifications. 7.2 The test shall be conducted with mach
23、ine at normal operating temperature. 7.3 Service brakes, if separate from the retarder, shall be fully disengaged. 7.4 If the retarder uses common energy-absorbing components with the service and/or secondary brake systems, the machines shall continue to comply with the applicable clauses of ISO3450
24、at the completion of the retarder verification test. 7.5 The verification test shall be conducted in an ambient temperature range of27 C to32 C, unless the performance is not affected by ambient temperature. NOTE 2In the event that an ambient temperature of27 C to32 C is not available, the32 C publi
25、shed performance cannot be verified, unless the performance is determined not to be affected by ambient temperature.BS6911-9:1993 2 BSI 12-1999 NOTE 3Because temperature correction factors are beyond the scope of this International Standard, it is necessary to conduct the test in a reference ambient
26、 temperature ranging from27 C to32 C, in order to be able to verify the published retarder performance for a reference temperature of32 C. Ambient temperatures outside the range of27 C to32 C may be used for verification. When ambient temperatures outside the range of27 C to32 C are used, the verifi
27、cation temperature shall then be stated in the test results. The verification temperature shall be no greater than5 C higher than the ambient temperature recorded during the test by the manufacturer. 7.6 Information to be recorded during the test as appropriate to the test method used shall be: a) m
28、achine speed; b) machine mass; c) towing force; d) grade slope; e) dynamometer output power; f) ambient temperature. 8 Verification test 8.1 Using the manufacturers published continuous retarding curves, determine the desirable combination of test machine rimpull and speed to be verified. Refer to F
29、igure A.1 for an example of the typically published information on a retarder performance. 8.2 Equip the machine with appropriate instruments to monitor and record necessary data pertaining to the stated critical parameters (see3.2). 8.3 Determine any system limitations and follow any manufacturers
30、caution regarding machine operation. 8.4 Check the service brake system for proper operation and to ensure its capability of stopping the machine at the test speed, load and grade conditions. 8.5 Conduct test runs as necessary to determine the machines continuous retarding capability. The average re
31、sults from three consecutive test runs shall be at least95% of the power as calculated from the published data. One point from the published curves is sufficient for test verification; this point shall be at maximum continuous power. 9 Retarding performance presentation format 9.1 When a machines re
32、tarding capability is to be published in accordance with this International Standard, the continuous retarding capability curve for32 C ambient temperature shall be shown. If the verification is not done at32 C, this shall be noted. Curves showing performance at additional temperatures may also be s
33、hown. 9.2 The retarding capability shall be shown using a format equivalent or similar to that presented in Figure A.1. 9.3 Annex A demonstrates the use of the retarding performance chart.BS6911-9:1993 BSI 12-1999 3 Annex A (informative) Example of use of retarding performance chart The use of the r
34、etarding performance chart is illustrated by the following example for a mechanical drive dumper. The maximum constant speed at which the machine model, for which the retarding performance is shown, can descend a given continuous grade is determined by following steps a) through e). The following in
35、formation is known: downhill grade: 12% rolling resistance: 2% maximum machine mass: 136 000 kg a) Calculate the effective grade. Subtract rollingresistance from downhill grade: (12%2% = 10%). b) Enter the chart at the maximum machine mass,136000 kg, point on the mass scale. c) Move vertically downw
36、ard until the10% effective grade line is intersected. d) Move horizontally to the left until the transmission speed line is intersected. e) Move vertically downward to the speed scale and determine maximum speed:26km/h. Figure A.1 Retarding capabilityBS6911-9:1993 4 BSI 12-1999 Annex B (informative)
37、 Bibliography 1 ISO 7132:1990, Earth-moving machinery Dumpers Terminology and commercial specifications. 2 ISO 7133:1985, Earth-moving machinery Tractor-scrapers Terminology and commercial specifications.BS6911-9:1993 BSI 12-1999 List of references See national foreword.BS 6911-9: 1993 ISO 10268: 19
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