BS ISO 11837-2011 Machinery for forestry Saw chain shot guarding systems Test method and performance criteria《林业机械 锯链冲击保卫系统 试验方法和性能标准》.pdf
《BS ISO 11837-2011 Machinery for forestry Saw chain shot guarding systems Test method and performance criteria《林业机械 锯链冲击保卫系统 试验方法和性能标准》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 11837-2011 Machinery for forestry Saw chain shot guarding systems Test method and performance criteria《林业机械 锯链冲击保卫系统 试验方法和性能标准》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 11837:2011Machinery for forestry Sawchain shot guarding systems Test method and performancecriteriaBS ISO 11837:2011 BRITISH STANDARDNational forewordThis British Standard
2、 is the UK implementation of ISO 11837:2011.The UK participation in its preparation was entrusted to TechnicalCommittee AGE/29, Forestry machinery.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the nec
3、essaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66309 3ICS 65.060.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Com
4、mittee on 31 July 2011.Amendments issued since publicationDate Text affectedBS ISO 11837:2011Machinery for forestry Saw chain shot guarding systems Test method and performance criteriaMatriel forestier Systme de protection contre ljection dlments de chanes de scie Mthode dessai et critres de perform
5、ance ISO 2011Reference numberISO 11837:2011(E)First edition2011-07-15ISO11837INTERNATIONAL STANDARDBS ISO 11837:2011ISO 11837:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any m
6、eans, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrigh
7、tiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedBS ISO 11837:2011ISO 11837:2011(E)Contents PageForeword ivIntroduction v1 Scope 12 Terms and definitions .13 Test equipment .23.1 Test apparatus 23.2 Drive unit .23.3 Saw chain speed control .23.4 Drive shaft speed measure
8、ment .23.5 Saw chain tensioning system 23.6 Saw chain lubrication system 23.7 Saw chain stopping device .23.8 Protective cover .24 Cutting attachment24.1 Guide bar .24.2 Drive sprocket 34.3 Saw chain 35 Reference panels .36 Pre-calibration of test arrangement .37 Assembly of saw chain shot guarding
9、system in test rig 47.1 Position 47.2 Alternative positions 47.3 Obstacles .58 Test procedure .59 Total number of test runs 610 Performance requirements .611 Test report .6Annex A (normative) Saw chain stopping device 8 ISO 2011 All rights reserved iiiBS ISO 11837:2011ForewordISO (the International
10、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 member body interested in a subject for which a technical committee has been esta
11、blished 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 Electrotechnical Commission (IEC) on all matters of electrotechnical standardiza
12、tion.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
13、 Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pat
14、ent rights.ISO 11837 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 15, Machinery for forestry.ISO 11837:2011(E)iv ISO 2011 All rights reservedBS ISO 11837:2011IntroductionOn the basis of a risk analysis, the types of saw chain bre
15、akage can be determined and a saw chain shot guarding system selected that protects against these risks.Harvester heads and grip saws need an effective saw chain shot guarding system. However, no such system can give 100 % safety protection against a saw chain shot. This International Standard speci
16、fies a method for evaluating the performance of a guarding system for the prevention of saw chain shot from behind the drive sprocket and upwards, relative to the direction of movement of the saw chain.The test apparatus specified in this International Standard is designed to simulate the situation
17、in which the saw chain becomes stuck in the wood at a cut and is broken. The end of the saw chain passes the drive sprocket in the guide bar plane. At different saw chain speeds and combinations of distance to the saw chain breakage, the break force, guide bar geometry and saw chain preload will thr
18、ow the saw chain in a curve, producing a whiplash that could create a chain shot.The test procedures presented in this International Standard can be used to evaluate a guarding systems ability to prevent the saw chain from producing whiplash and chain shot.ISO 11837:2011(E) ISO 2011 All rights reser
19、ved vBS ISO 11837:2011BS ISO 11837:2011INTERNATIONAL STANDARD ISO 11837:2011(E)Machinery for forestry Saw chain shot guarding systems Test method and performance criteriaCAUTION The test method specified in this International Standard involves the use of processes which could lead to a hazardous sit
20、uation. The test creates saw chain shots. Under no circumstances shall the test be performed without the protective cover for the test apparatus in place. The protective cover is only to be removed when rotating parts are standing still.1 ScopeThis International Standard specifies performance requir
21、ements and a corresponding test method for saw chain shot guarding systems on the harvester heads and grip saws of forestry machines.It is applicable only to saw chain breakage on the cutting side of the guide bar.NOTE Other test methods and test apparatus can be used if shown to give equivalent per
22、formance results.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1saw chain shotobject flying with high speed and consisting of one or more parts (drivelinks, sidelinks, cutters) of a broken saw chainNOTE 1 A saw chain consists of parts in the fo
23、rm of drivelinks, cutters and sidelinks held together by rivets.NOTE 2 The saw chain shot will have a weight of 1 g to 100 g, depending on the size of the saw chain and the broken saw chain parts.NOTE 3 During a test run, more than one saw chain shot can be created by the same saw chain whiplash, in
24、 different directions.2.2maximum design saw chain speedChighest saw chain speed under no load, for a given combination of saw chain, guide bar and drive sprocket2.3cutting attachmentcombination of saw chain, guide bar and drive sprocket mounted on the harvester head or grip saw2.4saw chain shot guar
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