1、TECHNICAL REPORT ISO/TR 8865 First edition 1990-12-01 ANSI I3temat Dot See Mining - Guidance on methods of verifying dimensions of sprocket assemblies for chain conveyors Reference number IS0 6665 : 1990 (El ISO/TR 6665 : 1990 (E) Foreword IS0 (the International Organization for Standardization) is
2、a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represent
3、ed on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The main task of IS0 technica
4、l committees is to prepare International Standards. In ex- ceptional circumstances a technical committee may propose the publication of a Technical Report of one of the following types: - type 1, when the required support cannot be obtained for the publication of an International Standard, despite r
5、epeated efforts; - type 2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard; - type 3, when a technical committee has collected data of a different kind from that which i
6、s normally published as an International Standard (“state of the art”, for example). Technical Reports of types 1 and 2 are subject to review within three years of publica- tion, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily ha
7、ve to be reviewed until the data they provide are considered to be no longer valid or useful. ISO/TR 8865, which is a Technical Report of type 3, was prepared by Technical Com- mittee ISO/TC 82, Mining, Sub-Committee SC 2, Components of coalface machinery using high-tensile round link chains. Intern
8、ational Standard IS0 5613 : 1984 covering drive sprocket assemblies for mining chain conveyors specifies requirements for a range of sprocket assemblies for use with twin outboard assemblies. These assemblies incorporate sprocket rings designed to accept chains complying with IS0 610, shackle type c
9、onnectors complying with IS0 1082 and scraper bars complying with IS0 5612. The dimensions of the component parts of the sprocket assembly are laid down in IS0 5613 and these dimensions have to be verified in order to check compliance with the standard. It is stated that the methods to be used for t
10、he verification of the dimen- sions shall be agreed between the purchaser and the manufacturer (IS0 5613 : 1984, 4.3). A number of the dimensions specified, in particular those relating to the tooth profile of the sprocket, cannot be measured by the direct application of conventional measuring instr
11、uments and it was decided to give some guidance on the special techni- ques involved. The member bodies participating in the work of ISO/TC 82/SC 2 studied the problem and it was found that a number of varying methods and instruments were used, all equally satisfactory if the appropriate dimensions
12、were controlled to ensure com- patibility with the other components of the chain assembly. The committee therefore came to the conclusion that no one method or instrument need be adopted as the “standard” method but guidance would be helpful on certain general principles and essential features of th
13、e checking gauges. This document is therefore published in the form of a Technical Report rather than an International Standard. 0 IS0 1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
14、 microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 l Switzerland Printed in Switzerland TECHNICAL REPORT ISO/TR 6665 : 1990 (E) Mining - Guidance on methods of verifying dimensions of sprocket assemblies fo
15、r chain conveyors 1 SCOPE This Technical Report gives guidance on methods of verifying sprocket dimensions specified in IS0 5613. This document is intended to identify those dimensions which should be measured to ensure compatibility between chain and sprocket. Recommendations are made to facilitate
16、 the measurement of these dimensions without resorting to complicated measuring equipments or techniques. 2 REFERENCES IS0 610:1990, High-tensile steel chains (round link) for chain conveyors and coal ploughs. IS0 1082:1984, Mining - Shackle type connector units for chain conveyors. IS0 5612:1990, M
17、ining - Scraper bars for chain conveyors. IS0 5613:1984, Mining - Drive sprocket assemblies for chain conveyors. 3. SIMPLE METHOD One of the simplest systems of verifying compatibility is to wrap specially calibrated chain assemblies (comprising chain and connectors) around a sprocket on a purely go
18、 - no go basis; the assemblies being made to the upper and lower limits of the manufacturing tolerances given in the relevant IS0 standard. 4 SPROCKET POCKET CHECKING GAUGE There are many conventional methods and equipments available for use in determining the normal dimensions of the sprockets but
19、special consideration is necessary for checking those dimensions which are virtually in space. For this purpose most countries utilise a sprocket pocket checking gauge to provide the missing link. Combinations of gauges are used to represent links from which measurements can be taken. The sprocket p
20、ocket checking gauges used vary in detail but generally they conform to the dimensions shown in figure 1 and table 1. 5 APPLICATION OF CHECKING GAUGES Some typical arrangements of gauges and measurements that can be taken to check compliance with IS0 5613, are shown in figures 2-8. Other dimensions,
21、 such as tooth pitch (figure 9) and angular displacement of teeth (figure 10) can also be checked using this type of gauge. 1 ISO/TR 6665 : 1990 (E) b - marks on the centreline - FIGURE 1 - Sprocket pocket checking gauge NOTE - The length of the gauge link is adjustable from the minimum length 1 to
22、the maximum .ength 1 + 10 mm. TABLE l- Dimension of sprocket pocket checking gauge 2 d 1 b =1 r2 0 0 0 0 0 -0,l -0,l -0,l -0,l -0,l 14 78 48 24 18 100 60 30 22 130 74 37 24 134 80 40 24 136 80 40 26 144 86 43 7 9 11 12 12 13 ISO/TR 6665 : 1990 (E) FIGURE 2 - Sprocket ring centres (Dimension A) FIGUR
23、E 4 - Root radius (Dimension H) FIGURE 3 - Centreline of groove to inside face (Dimension G) J FIGURE 5 - Pocket plan radius (Dimension J) i/ I 1 1 !I ,I/ + FIGURE 6 - Sprocket centre to .bottom of pocket (Dimension K) Pif/? / I . 1 , / FIGURE 7 - Length of FIGURE 8 - Pocket pocket (Dimension L) cen
24、tres (Dimension M) Extension bar nadded to gauge FIGURE 9 - Tooth pitch FIGURE 10 - Angular displacement of teeth across barrel 3 ISO/TR 8865 : 1990 (E) UDC 621.867.1 : 622.24 : 531.718 Descriptors: mining equipment, chain conveyors, chain drives, sprocket wheels, dimensions, verification, checking equipment, gauges. Price based on 1 page
