ISO INTERNATIONAL STANDARD 5612 Second edition 1990-08-01 ANsl Internat Doc Sec! Mining - Scraper bars for chain conveyors Exploitation miniere - Raclettes pour convoyeurs a chaines Reference number ISO 5612 : 1990 (E) No reproduction or networking permitted without license from IHS Not for Resale ISO 5612 : 1990 (E) Foreword Iso(the International OrganizationforStandardization)is aworldwidefederation 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 established has the right to be represented on that committee. International organizations, govern- mentai and non-governmental, in liaison with iso, also take part in the work. ISO collaborates closely with the international Electrotechnical Commission (IEC) on all mattersof electrotechnical standardization. Draft International Standards adoptedbythetechnical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 5612 was prepared by Technical Committee ISO/TC 82, Mining. This second edition cancels and repiaces the first edition (IS0 5612 : 1984), of which it constitutes a minor revision. All references to IsO/R 147 have been replaced by a reference to Iso 7500-1. @ISO1990 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 microfilm,without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright Inte or Standardizatior No reproduction or networking permitted without license from IHS Not for Resale ISO 5612 :1990 (E) INTERNATIONALSTANDARD Mining - Scraper bars for chain conveyors Scope 3 Definitions This International Standard specifies the requirements for a For the purposes of this International Standard, the following rangeof scraperbarsforuse intwinoutboard chainassemblies definitions apply. made from chains complying with Iso 610 and associated shackle type connectors complying with IS0 1082. The range 3.1 twinoutboard chainassembly:Pairs of chains to of scraper bars specified is intended for use with chains of diameter 14, 18, 22, 24 and 26 mm in a selected range of chain which scraper bars are coupled by means of shackle type con- nectors. centres and clamped tight within the shackle type connectors. This International Standard is not intended to indicate a com- 3.2 nominal chain centres: The distance between the plete design,but gives sufficient detail to ensure dimensional centres of the chains in the assembly. compatibility with the associated chains and connectors. Dimensions of section ends of the scraper bars necessary for 3.3 force-deflection test: A test to determine the ability of compatibility between scraper bars and connectors are a scraper bar to sustain a minimum deflection and the strength specified. The centre sections of the scraper bars may be of any rating. design and shape, within the range of dimensions given in table: 1 for the appropriate chain centres. Other dimensions 3.4 minimum deflection: The deflection that a scraper bar may be subject to national standards or agreement between the is required to sustain without fracture. purchaser and the manufacturer. As a guide to the selection of scraper bars for specific applica- 3.5 strength rating: The force required to produce a central tions, scraper bars are rated by determining the force at which deflection in the scraper bar, equal to 10 % of the nominal a specified minimum deflection is attained, when the bar is sub- chain centres of the assembly. jected to a three-point bend test. The bars can be classified as "light", "medium" or "heavy", according to