1、BS ISO 8643:2017 Earth-moving machinery Hydraulic excavator and backhoe loader lowering control device Requirements and tests BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 8643:2017 BRITISH STANDARD National foreword This British Standard is the UK implemen
2、tation of ISO 8643:2017. It supersedes BS 6912-1:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B/513/1, Earth moving machinery (International). A list of organizations represented on this committee can be obtained on request to its secretary. T
3、his publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017 ISBN 978 0 580 78858 1 ICS 53.100 Compliance with a British Standard cannot confe
4、r immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017. Amendments/Corrigenda issued since publication Date Text affectedBS ISO 8643:2017 ISO 2017 Earth-moving machinery Hydraulic excavator and bac
5、khoe loader lowering control device Requirements and tests Engins de terrassement Dispositif de contrle dabaissement de la flche des pelles et chargeuses-pelleteuses hydrauliques Exigences et mthodes dessai INTERNATIONAL STANDARD ISO 8643 Third edition 2017-02 Reference number ISO 8643:2017(E)BS ISO
6、 8643:2017ISO 8643:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, includ
7、ing photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Te
8、l. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 8643:2017ISO 8643:2017(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Lowering control device requirements . 2 5 Test method . 4 5.1 Apparatus 4 5.2 Preparation for test . 4
9、5.3 Testing of lowering control device . 7 5.3.1 General 7 5.3.2 Testing of internal leakage 9 5.3.3 Testing of holding position 9 5.3.4 Testing during raising 9 5.3.5 Testing during lowering. 9 5.3.6 Testing of equalizing lines or signal lines . 9 Bibliography .11 ISO 2017 All rights reserved iii C
10、ontents PageBS ISO 8643:2017ISO 8643:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each memb
11、er body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Ele
12、ctrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
13、 of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
14、e held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents). Any trade name used in this document is in
15、formation given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technica
16、l Barriers to Trade (TBT) see the following URL: www . i s o .org/ iso/ foreword .html. This document was prepared by Technical Committee ISO/TC 127, Earth-moving machinery, Subcommittee SC 1, Test methods relating to safety and machine performance. This third edition cancels and replaces the second
17、 edition (ISO 8643:1997), which has been technically revised and contains the following changes: requirements and test provisions have been extended to support a wider range of lowering control device configurations.iv ISO 2017 All rights reservedBS ISO 8643:2017ISO 8643:2017(E) Introduction Where e
18、xcavators or backhoe loaders are used for object handling, a failure or rupture in the hydraulic circuit can endanger persons under raised loads. This risk can be reduced by applying a lowering control device, which ensures controlled lowering of the load in the case of a hydraulic line failure or r
19、upture. Test procedures are based on the design characteristics of the hydraulic systems of hydraulic excavators and the backhoe part of backhoe loaders, and conditions of use. ISO 2017 All rights reserved vBS ISO 8643:2017BS ISO 8643:2017Earth-moving machinery Hydraulic excavator and backhoe loader
20、 lowering control device Requirements and tests 1 Scope This document establishes uniform requirements and test procedures for lowering control devices fitted on the boom, intermediate boom and arm cylinders of hydraulic excavators and backhoe loaders to control the rate of drop in the case of a hyd
21、raulic line failure or rupture. It is applicable to the lowering control devices of hydraulic excavators and the backhoe equipment of backhoe loaders used for object handling which are equipped with the standard linkage as defined by the manufacturer. On machines where alternative linkage combinatio
22、ns are offered, only the standard length defined by the manufacturer is subject to testing. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cit
23、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6165, Earth-moving machinery Basic types Identification and terms and definitions ISO 9248:1992, Earth-moving machinery Units for dimensions, performance and capacities, and thei
24、r measurement accuracies 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in ISO 6165 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ w
25、ww .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp 3.1 linkage control system hydraulic control components (including pilot and slave valves) used for raising and lowering the lift point in object handling applications 3.2 lifting linkage assembly of part
26、s that can be a combination of booms and arms used for raising and lowering the lift point in the object handling process 3.3 lowering control device hydraulic control valves used for controlled linkage lowering in the case of a hydraulic line failure or rupture 3.4 failure-simulation device hydraul
27、ic valves used for simulating a failure or rupture in a hydraulic line in the linkage control system INTERNATIONAL ST ANDARD ISO 8643:2017(E) ISO 2017 All rights reserved 1BS ISO 8643:2017ISO 8643:2017(E) 3.5 signal line hydraulic circuit that is used to sense a pressure EXAMPLE Diagnostic test port
28、, stability limit system. 3.6 rated lift capacity smaller of either the rated tipping capacity or the rated hydraulic lift capacity SOURCE: ISO 10567:2007, 3.13 3.7 lift point LP location on the attachment (e.g. bucket) or the quick coupler, as specified by the manufacturer, to which a load can be a
29、ttached SOURCE: ISO 10567:2007, 3.2, modified 3.8 lift point radius LPR horizontal distance from the axis of rotation to the vertical hoist line or tackle SOURCE: ISO 10567:2007, 3.5 3.9 object handling application of earth-moving machinery comprising lifting, lowering and transporting of a load by
30、use of lifting accessories, whereby the assistance of a person or the operator of the machine is required for hooking, unhooking or stabilizing (whilst transporting) the load Note 1 to entry: If the load is picked-up by a self-acting device and no assistance of a person is required for hooking, unho
31、oking or stabilizing the load, this work is considered as a usual earth-moving application. Note 2 to entry: Lifting accessories are, e.g. wire ropes, chains or textile straps; loads in object handling application are, e.g. pipes, vessels; self-acting devices are, e.g. grabs, clamshell buckets, log
32、clamps, vacuum lifting device, magnetic plate or fork. 4 Lowering control device requirements 4.1 Lowering control devices shall comply with the requirements given in 4.1.1 to 4.1.8. 4.1.1 The lowering control device shall operate automatically while the cylinders in the linkage control system that
33、keep the load in a lifted position are pressurized, even if the machine/ignition is switched off. 4.1.2 The operation of the lowering control device shall not detract from the normal response of the machine during use and shall not at any time endanger the stability of the machine. 4.1.3 A relief va
34、lve to protect the cylinder may be fitted between the cylinder and the lowering control device. 4.1.4 In the case of a failure in the linkage control system, lowering the load shall be possible without endangering persons or the stability of the machine.2 ISO 2017 All rights reservedBS ISO 8643:2017
35、ISO 8643:2017(E) 4.1.5 Each cylinder in the linkage control system that keeps the load in a lifted position shall have the following secured to it: a) the lowering control device as well as related tubes and fittings between the lowering control device and the cylinder (hoses are not acceptable); b)
36、 when provided, a separate relief valve (see 4.1.3) as well as related tubes and fittings to connect it in parallel with the lowering control device. Tubes and fittings related to connecting the control valve, and the relief valve when provided in parallel to the cylinder, shall have a minimum burst
37、 pressure of four times the working circuit pressure for that part of the system. 4.1.6 If signal lines are present, then rupture of one of these lines shall result in an oil leakage of not more than 10 L/min for each cylinder at an oil temperature of approximately 40 C to 50 C at the specified work
38、ing circuit pressure. 4.1.7 If equalizing lines between cylinders are present, then rupture of one of these lines shall result: for machines with an operating mass (according to ISO 6016) of up to 40 t in an oil leakage lower than 10 L/min for each cylinder at an oil temperature of 40 C to 50 C at t
39、he specified working circuit pressure; for machines with an operating mass (according to ISO 6016) equal to or greater than 40 t in a cylinder stroke speed lower than 3 % per second of the total stroke for each cylinder at an oil temperature of 40 C to 50 C at the specified working circuit pressure.
40、 NOTE Further investigation concerning the application of the requirement to arm cylinder equalizing line is needed; in the meantime, the requirement can be applied to the arm cylinder as well. 4.1.8 Performance requirements Lowering control devices (and equalizing or signal lines, if present) shall
41、 be tested in accordance with the test conditions and acceptance criteria given in Table 1. ISO 2017 All rights reserved 3BS ISO 8643:2017ISO 8643:2017(E) Table 1 Performance requirements Test condition Test load setup height Machine and control setup Acceptance criteria Ref. Testing of internal lea
42、kage 1,0 m 0,1 m above ground All controls in neutral Vertical drop rate 10 mm/s 5.3.2 Holding position 1,0 m 0,1 m above ground All controls in neutral Failure-simulation device opened Total vertical drop in 10 s 100 mm 5.3.3 Raising 1,0 m 0,1 m above ground Raise smoothly and con- tinuously Failur
43、e-simulation device opened Keep lowering control device in position Total vertical drop in 10 s 100 mm 5.3.4 Lowering 1,0 m 0,1 m above ground or higher minimum height so that the test load does not come into contact with the ground surface dur- ing the test Lower smoothly and con- tinuously Failure
44、-simulation device opened All controls in neutral The increase in the lowering speed of the test load shall be less than 100 % increase of the initial speed averaged over a period of at least 2 s Total vertical drop in 10 s 100 mm 5.3.5 Equalizing/ Signal lines No load Linkage at maximum lift height
45、 40 t: oil leakage 40 t: a cylinder stroke speed of not more than 3 % per second of the total stroke for each cylinder 5.3.6 5 Test method 5.1 Apparatus 5.1.1 Means of measuring displacement in the vertical plane against time, to an accuracy according to ISO 9248:1992. Scales and stopwatches are all
46、owed provided they meet the requirement on accuracy indicated in 5.1.1. 5.1.2 Thermometer, or equivalent temperature measuring device, measuring from 0 C to 100 C with an accuracy of 1 C. 5.1.3 Collecting container, for hydraulic oil, or alternatively, an oil return line to the tank. 5.2 Preparation
47、 for test 5.2.1 Test and recording methods ensuring repeatable and reproducible results shall be used (e.g. video recording against a fixed background scale).4 ISO 2017 All rights reservedBS ISO 8643:2017ISO 8643:2017(E) 5.2.2 A failure-simulation device shall be installed in any hydraulic line in t
48、he linkage control system, failure of which could cause the lifting linkage to lower if the lowering control device was not installed. Examples of such installations are as follows: a) in the line between the cylinder and control valve, as shown in Figure 1; b) in the signal line between the cylinde
49、r and machine side monitoring testing devices (for example, pressure sensor), as shown in Figure 2; c) in the equalizing line between the cylinders, as shown in Figure 3. This can require running multiple tests with the failure-simulation device in different locations. For example: a test with the failure-simulation device in the line between the cylinder and the control valve see a) above and a test with the failure-simulation device in the equalizing line betwee
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