1、SAE-J820ADOPTION NOTICESAE-J820, “CRANE HOIST LINE SPEED AND POWER TEST CODE“, wasadopted on 03-OCT-94 for use by the Department of Defense(DoD). Proposed changes by DoD activities must be submitted tothe DoD Adopting Activity: WR-ALC/TILCC, 255 Second Street, Suite122, Robins AFB, GA 31098-1640. Co
2、pies of this document may bepurchased from the Society of Automotive Engineers 400Commonwealth Drive Warrendale, Pennsylvania, United States,15096-0001. http:/www.sae.org/_Custodians: Adopting Activity:Air Force - 84Army - CR4Navy - YDAir Force - 99FSC 3810DISTRIBUTION STATEMENT A: Approved for publ
3、ic release; distributionis unlimited.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical
4、 and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time
5、 it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1998 Society of Automotive Engi
6、neers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National StandardJ820REAF.JUL1998Issued 1962-04Reaffirmed 1998-07Superseding J820 OCT80Crane Hoist Line Speed and Power Test Cod
7、eForewordThis Reaffirmed Document has been changed only to reflect the new SAE Technical Standards BoardFormat. Scope was changed to Section 1. Object was changed to 1.1. Reference Section was added as Section 2.1. ScopeThis code applies primarily to mobile cranes that lift loads by means of a drum
8、and hoist linemechanism. It can be used to determine the hoist line speed and power of other hoist line mechanisms, if loadcan be held constant and hoist line travel distance is sufficient for the accuracy of the line speedmeasurements prescribed.1.1 ObjectThe object of this test is to determine the
9、 hoist line speed that a mobile crane develops while hoistinga specified load with a specified condition of rope layers on the drum. The specified load is reported in poundsand the hoist line speed in feet per minute. Values derived may be used to calculate hoist line power.2. ReferencesThere are no
10、 referenced publications specified herein.3. Definitions3.1 SpecifiedRecommendations or requirements stated by the manufacturer, the user, the testing agency, orany agreement between these parties.3.2 Hoist LineA wire rope or similar line that operates in conjunction with sheaves and a drum, for the
11、 purposeof lifting and supporting loads.3.3 Hoist Line PowerA rate of doing work, derived by mathematically correlating measured values of time,distance, and force; normally expressed as horsepower or foot pounds per unit time.3.4 LoadThe weight in pounds of the hookblock and other items suspended f
12、rom the hookblock, as arranged tomake up the specified load weight.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J820 Reaffirmed JUL1998-2-4. Limitations4.1 It is important that the manufacturers
13、 maximum load recommendations for the conditions of test not beexceeded, since such loads are frequently based on structure or stability limitations.4.2 Hoist mechanisms on mobile cranes are usually powered by internal combustion engines. Such engines areaffected in performance by the atmospheric co
14、nditions of temperature, humidity, and altitude. For this reason,and because engine and hoisting mechanism friction is indeterminate, the values measured are reported asobserved. Reliable correction factors for the influence of atmospheric conditions and mechanism friction arenot available; hence th
15、e results of test may be compared with other tests, only if such tests are conductedunder identical atmospheric conditions.5. Facilities, Apparatus, and Materials5.1 Tachometer of range suitable to indicate engine speed; accuracy 1% of rpm measured.5.2 Means for weighing test weights, hookblock, sli
16、ngs, and other load components; accuracy 0.5% of the weightmeasured.5.3 Test weights or other loading means as required to make up the specified load within 0.5% of the total weightspecified.5.4 Means to measure and record:a. Line travel distance; accuracy 1% of measured value.b. Line travel time; a
17、ccuracy 1% of measured value.c. Load line force; accuracy 2% of values recorded throughout range of values measured.6. Procedure6.1 Service and adjust the machine to be tested in accordance with the manufacturers instructions.6.2 Operate the machine under part load for sufficient time to assure that
18、 it is fully limbered-up. Recheckadjustments after the machine is operated to assure that the engine, clutches, brakes, and other powertransmitting components remain within the manufacturers recommended tolerances.6.3 Assemble a test load as specified.6.4 Arrange the hoisting tackle on the machine i
19、n accordance with the manufacturers instructions, using theminimum parts of hoist line necessary to assure safe and smooth operating while hoisting the specified load.NOTEIt is desirable to use a single part line in order to reduce tackle friction; however, safety and load traveldistance may dictate
20、 need for multiple part lines.6.5 Attach the specified load to the hoist line and install line speed and force sensing and recording instruments.6.6 Perform sufficient trial runs of hoisting the specified load to assure that:a. The machine operator is familiar with procedure of operation.b. The mach
21、ine is warmed up to normal operating temperatures.c. The instruments are functioning properly.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J820 Reaffirmed JUL1998-3-6.7 With the engine operating
22、 at full throttle smoothly engage the hoist and lift the load. While the load is beinglifted, measure and record:a. Hoisting forceb. Hoist line travel distancec. TimeRepeat this operation to obtain a total of five recorded runs.7. Computations and Records7.1 For each test run, calculate the average
23、hoist line speed, using only that portion of the records where therecorded hoisting force remains constant within 2% of average. Record the average speed and load value foreach recorded run on the test summary sheet. (See Figure 1.)7.2 Calculate the hoist line power in horsepower for each recorded r
24、un as shown in Equation 1:(Eq. 1)where:L = Load (lb)S = Line Speed (fpm)P = Number of parts in the hoist lineRecord these values on the test summary sheet. (See Figure 1.)7.3 Calculate the average hoist line power for all recorded runs and record this value on the test summary sheet.NOTEWherein the
25、horsepower for any individual run deviates more than 2% from the arithmetic mean forall runs, a determination should be made of reasons for erratic performance, the data discarded, andthe test rerun.HPLS33 000P-=Copyright SAE International Provided by IHS under license with SAENot for ResaleNo repro
26、duction or networking permitted without license from IHS-,-SAE J820 Reaffirmed JUL1998-4-FIGURE 1TEST DATA SUMMARY SHEETPREPARED BY THE SAE CRANES AND LIFTING DEVICES TECHNICAL COMMITTEECopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking perm
27、itted without license from IHS-,-SAE J820 Reaffirmed JUL1998RationaleThis Reaffirmed document has been changed only to reflect the new SAE Technical StandardsBoard format. Scope was changed to Section 1. Object was changed to 1.1. Reference Section wasadded as Section 2.Relationship of SAE Standard
28、to ISO StandardNot applicable.ApplicationThis code applies primarily to mobile cranes that lift loads by means of a drum and hoist linemechanism. It can be used to determine the hoist line speed and power of other hoist line mechanisms,if load can be held constant and hoist line travel distance is s
29、ufficient for the accuracy of the line speedmeasurements prescribed.Reference SectionThere are no referenced publications specified herein.Developed by the SAE Cranes and Lifting Devices Technical CommitteeCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
