1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2007 SAE InternationalAll rights reserved. No part of this publication may be
3、reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-
4、776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLERECOMMENDEDPRACTICEJ1305REAF.NOV2007Issued 1987-06Reaffirmed 2007-11Superseding J1305 JUN1987Two-Block Warning and Limit Systems in Lifting Crane Service1. ScopeThis SAE Recommended Practice applies to cranes in lif
5、ting crane service which are equipped withtwo-block warning and/or limit systems.1.1 PurposeThe purpose of this SAE Recommended Practice is to establish the minimum performancerequirements of devices which signal and/or automatically prevent two-blocking.2. ReferencesThere are no referenced publicat
6、ions specified herein.3. Definitions3.1 Two-BlockingContact of the lower load block or hook with the upper load block, boom point, or boom pointmachinery.3.2 Two-Block SensorA device which senses impending two-blocking.3.3 Two-Block Warning SystemA device applied to cranes which warns of impending t
7、wo-blocking.3.4 Two-Block Limit SystemA device applied to cranes which prevents two-blocking.4. Performance Criteria4.1 The Two-Block Warning System is to warn the operator by audible, visual or other means of impending two-blocking in sufficient time to allow reasonable reaction of the operator.4.2
8、 The Two-Block Limit System shall perform one or more of the following:4.2.1 CONTROL LOCK-OUTThe system is to prevent two-blocking by automatically neutralizing the control and/orstopping motion which would result in two-blocking. The system is to allow control of motion in directionsthat eliminate
9、two-blocking. Occurring motions that do not affect a two-blocking condition are not to beinterrupted and are to be allowed to continue in the desired controlled manner.4.2.2 CONTROLLED PAYOUTThe system shall prevent a two-blocking condition by providing controlled payout ofthe load hoist rope at imp
10、ending two-blocking.SAE J1305 Reaffirmed NOV2007-2-4.3 Temperature EffectThe system shall operate over an ambient temperature range of 30 to +50 C (22+122 F).4.4 Operation CheckThe system shall have a means for the operator or other responsible person to determinethat it is operative prior to crane
11、use.4.5 TestingThe two-block prevention system shall be performance tested by the installer initially and by the userat intervals recommended by the manufacturer, or at any time that there is an indication of possible malfunction(See 4.1, 4.2 and Section 6).5. General Requirements5.1 Installation an
12、d MaintenanceInstallation and maintenance of the two-block sensor and maintenance of thecrane should be in accordance with the appropriate manufacturers recommendations.5.2 IdentificationLabels, when applicable, shall be placed on the device or in the operators cab, or both, givingthe following info
13、rmation:a. Basic operating instructions and precautions.b. Device manufacturers name, address, device model number and serial number.5.3 ManualOperation, installation and service manual(s) shall be provided by the manufacturer and shall beavailable to the operator or other responsible persons at all
14、 times.6. Performance Evaluation Tests6.1 General Testing Requirements6.1.1 Specific test instructions shall be provided by the manufacturer.6.1.2 Test personnel shall be thoroughly familiar with the devices operation and the manufacturers recommendedtest procedures and shall check the system for al
15、l functions.6.1.3 The system shall be initially tested to establish compliance with the appropriate paragraph(s) in Section 4.PREPARED BY THE SAE ORMTC/SUBCOMMITTEE 31CRANES & LIFTING DEVICESSAE J1305 Reaffirmed NOV2007RationaleThe attached proposed Recommended Practice represents the accumulative e
16、ffort of WorkingGroup E, SAE ORMTC Sub-Committee 17.The proposed Recommended Practice establishes minimum performance criteria for devices whichsignal or prevent two-blocking of hoist mechanisms on cranes being used in lifting service.Damage to the crane boom or wire rope or wire rope failure due to
17、 the raising of the load block into theboom point or upper load block has resulted in the need for defining and establishing performancerequirements of two-block systems.This document was balloted by ORMTC in March, 1980 under the title “Two-Block Prevention Systems inLifting Crane Service“ with 3 d
18、isapproval votes among the ballot results. Subsequent revision toaccommodate these disapprovals become significant enough in both editorial and technical areas that itwas deemed appropriate to recirculate the revised document through SC 17 members.The next balloting among SC17 members resulted in th
19、ree disapprovals, all of which questioned certaintechnical descriptions of the systems occurring functions. These three disapprovals were subsequentlyfully satisfied and the document sent on for ORMTC approval.Resulting ORMTC ballotting resulted in no disapprovals, however, several suggestions and c
20、ommentsaccompanying the ballot approvals were considered and implemented, if possible, by the Working Groupevolving the document into the form as represented here.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Practice applies to cranes in lifting crane service which are equippedwith two-block warning and/or limit systems.Reference SectionThere are no referenced publications specified herein.Developed by the SAE ORMTC/Subcommittee 31 - Cranes & Lifting DevicesSponsored by the the Off-Road Machinery Technical Committee
