1、CEMASTANDARDNO. 404-2003CHAIN DRIVEN LIVE ROLLER CONVEYORSUnit Handling ConveyorsConveyor EquipmentManufacturers AssociationANSI / CEMA 404-2003 (R2009)Reaffirmation of ANSI / CEMA 404-2003( Approved January 22, 2009)ISBN 978-1-891171-30-7SAFETY NOTICEThe Conveyor Equipment Manufacturers Association
2、 has developed Industry Standard Safety Labelsfor use on the conveying equipment of its member companies.The purpose of the labels is to identify common and uncommon hazards, conditions, and unsafepractices which can injure, or cause the death of, the unwary or inattentive person who is working ator
3、 around conveying equipment.The labels are available for sale to member companies and non-member companies.A full description of the labels, their purpose, and guidelines on where to place the labels on typicalequipment, has been published in CEMAs Safety Label Brochure No. 201. The Brochure is avai
4、lablefor purchase by members and non-members of the Association. Safety Labels and Safety LabelPlacement Guidelines, originally published in the Brochure, are also available free on the CEMA WebSite at http:/www.cemanet.org/CEMA_Safety_Pg.htmPLEASE NOTE: Should any of the safety labels supplied by t
5、he equipment manufacturer becomeunreadable for any reason, the equipment USER is then responsible for replacement and location ofthese safety labels.Replacement labels and placement guidelines can be obtained by contacting your equipment supplieror CEMA.For Information on Company Membershipvisit the
6、 CEMA Web Site athttp:/www.cemanet.orgConveyorChainCEMA ORGANIZATIONAL CHARTControls PalletizersMeet in March and/or SeptemberConferenceStrategic PlanningInsuranceMeetingsMarketing / MembershipStatisticsFinance and BudgetPast PresidentsBulk HandlingSectionCommitteesUnit HandlingSectionEngineering Co
7、nferenceConveyor ChainPerformance TerminologyUnit Handling StandardsIdlersPulleysBeltSystemsScrewConveyorsBelt ManualAccessoriesSafety ControlsTerms andDefinitionsInternationalStandardsMeets Each JuneScrewConveyorsBulk HandlingComponentsand SystemsGeneral Bulk Handling SectionBulkAccessoriesUnit Han
8、dling Conveying SectionCOMMITTEES BOARD OF DIRECTORS OFFICERSDISCLAIMERThe information provided in this document is advisory only. These recommendations areprovided by CEMA in the interest of promoting safety in the work place. Theserecommendations are general in nature and are not intended as a sub
9、stitute for a thoroughsafety program. Users should seek the advise, supervision or consultation of qualifiedengineers or other safety professionals.Any use of this document, the information contained herein, or any other CEMA publicationmay only be made with the agreement and understanding that the
10、user and the users companyassume full responsibility for the design, safety, specifications, suitability and adequacy ofthe system component, or mechanical or electrical device designed or manufactured usingthis information.The user and the users company understand and agree that CEMA, its member co
11、mpanies,its officers, agents and employees shall not be liable in any manner under any theory of liabilityfor the user or users reliance on these recommendations.The users and the users company agree to release, hold harmless and indemnify CEMA, itsmember companies, successors, assigns, officers, ag
12、ents and employees from any and allclaims of liability, costs, fees (including attorneys fees), or damages arising in any way out ofthe use of this information.CEMA and its member companies, successors, assigns, officers, agents and employeesmake no representations or warranties whatsoever, either e
13、xpress or implied, about theinformation contained in this document, including, but not limited to, representations orwarranties that the information and recommendations contained herein conform to any federal,state or local laws, regulations, guidelines or ordinances.FOREWORDChain driven live roller
14、 conveyors are used for the controlled movement of a great variety of regular or irregular shapedcommodities, from light and fragile to heavy and rugged unit loads.The path is usually level, but it can be slightly inclined or declined, limited by the coefficient of friction between therollers and th
15、e load. Chain driven live roller conveyors are used for transportation, as a pacesetter for assemblyoperation, and as a timing medium for integrated handling systems.The purpose of this standard is to establish recommended minimum standards for use in the design and application ofchain driven live r
16、oller conveyors.For additional information relating to definitions and selection of common components, see latest edition of the follow-ing publications: CEMA Standard No. 401, Roller Conveyors-Non Powered; CEMA Standard No. 402, Belt Conveyors;CEMA Standard No. 403, Belt Driven Live Roller Conveyor
17、s; and CEMA Standard No. 102, Conveyor Terms andDefinitions.The illustrations throughout this book are schematic in nature and represent the general nature of a particular device.The illustrations are not intended to represent the recommended safety configurations since guarding has been omit-ted to
18、 permit clarity in showing the operational characteristics of the device. Refer to the current editions of ANSI/ASME B20.1, Safety Standard for Conveyors and Related Equipment; ANSI/ASME B15.1, Safety Standard for Me-chanical Power Transmission Apparatus; and ANSI Z244.1, American National Safety St
19、andards for Lockout/Tagout ofEnergy Sources - Minimum Safety Requirements; Title 29, Code of Federal Regulations (29 C.F.R.) Part 1910.147,The control of hazardous energy (lockout/tagout); Title 29, Code of Federal Regulations (29 C.F.R.) Part 1910 SubpartO, Machinery and Machine Guarding.iCONVEYOR
20、EQUIPMENT MANUFACTURERS ASSOCIATION6724 Lone Oak BlvdNaples, Florida 34109Web Site: http:/www.cemanet.orgStandard No. 404 - Copyright 2009Printed in the U.S.A.ISBN 1-891171-30-7TABLE OF CONTENTSSection PageDEFINITIONS 1 1Chain Driven Live RollerContinuous Chain TypeRoll-to-Roll TypeMechanical Elemen
21、ts of Chain Driven Live RollerAPPLICATION DATA 2 2General Application Engineering DataRoll-to-Roll ConstructionContinuous Chain ConstructionLive Shaft ConstructionChain Driven Live Roller CurvesTransfersAccumulating Chain Driven Live RollerDiagrams:Roll-to-Roll ConstructionContinuous Chain Construct
22、ionTransfer Selection DataTECHNICAL DATA 3 9Chain Pull and Horsepower CalculationsTable I Combined Friction FactorTable II Factor For Determining Value “Q”Table III Minimum Sprocket Teeth per Roller DiameterTable IV Minimum Roller CentersiiNote - CEMA Has Reaffirmed the 2003 Edition.This 2009 Editio
23、n is Identical to the 2003 EditionSUMMARY OF CHANGES IN 2003 EDITIONA summary of the major changes in this edition:All drawings have been cleaned up and enhanced for clarity where necessary.Foreword:Updated to include Safety Label Requirements Notice.Section 1: DefinitionsTerms and Definitions have
24、been expanded, regrouped for ease of understanding, and revised toconform with those in ANSI/CEMA Standard No. 102, Conveyor Terms and Definitions.Section 2: ApplicationFigures have been redrawn and, in some cases, regrouped for clarity.Section 3: Technical DataNo changesCEMA Standard No. 404-2009 (
25、PDF)Reviewed byUnit Handling Sectionof theCEMA Engineering ConferenceSection IDEFINITIONSChain Driven Live Roller - Conveyors which use a roller bed for the carrying surface. The unit loads ride directly upon theroller surfaces, and the rollers are driven by chains and sprockets.Roll-to-Roll Type -
26、A chain driven live roller conveyor in which power is transmitted from roll to roll via short chain loops,each of which encircles the sprocket attached to the adjacent driven rollers, causing each to rotate. Two sprockets are requiredfor each driven roller. (see Figures 1 through 8, Page 6)Continuou
27、s Chain Type - A chain driven live roller conveyor driven by one continuous strand or loop of chain, engaging asprocket attached to each driven roller, causing the roller to rotate. One sprocket is required for each driven roller. (see Figures9-17, Page 7)Mechanical Elements of Chain Driven Live Rol
28、lerChain - A series of links pivotally joined together to form a medium for conveying or transmitting motion or power.Riveted: A chain in which the ends of the pins are “headed” and/or swagged or riveted so that the chain cannot bedisassembled without cuffing off the pin.Roller: A chain having a rol
29、ler encircling the barrel or bushing of each joint.Tension: The actual pull existing at any point in a chain.Link: A chain unit of one pitched length.Conveyor Bed - Carrying rollers that support the load while it is being conveyed (see also “Width, Effective Conveyor”).Differential Curve - A curved
30、section of roller conveyor having a conveying surface of two or more concentric rows of rollers.Drive - An assembly of the necessary structural, mechanical and electrical parts which provide the motive power for a con-veyor.Frame Rails - Members that support the conveying components of non-powered o
31、r powered roller conveyors. Rollers are thesupported components on roller conveyors.Guard - A covering or barricade for safety purposes such as gear, chain, or nip guards.Holddown - A wear-member located over the driving (top) side of chain and sprockets to prevent chain disengagement fromthe sprock
32、et teeth. Used on continuous chain construction chain driven live roller conveyor.Horizontal Curve - A curved roller conveyor section used to change the direction of travel.Idler - A pulley, sheave, sprocket, or wheel around which a chain passes in changing direction of travel; chain-supportingsproc
33、ket.Intermediate Drive - A drive that transmits motive power to a conveyor at a point other than the terminals.Live Roller Conveyor - A series of rollers over which objects are moved by the application of power to all or some of therollers.Plates, Fill-in - Closely fitted plates positioned between t
34、he rollers of powered or non-powered roller conveyors.Return Run - That portion of the chain which returns from the discharge to the loading end of a conveyor.1Return Track - A track supporting the conveying medium (chain) on the return run.Roller - A round part free to revolve its outer surface. Th
35、e face may be straight, tapered, crowned, concave or flanged,corrugated, ribbed or fluted. Typically, a cylindrical member with internal bearings mounted on a non-rotating shaft. Rollers canhave live shafts and outboard bearings. In a chain driven live roller conveyor, rollers are powered via sprock
36、ets attached toeither or both ends of the roller or live shaft.Carrying: The conveyor roller upon which the object being transported is supported.Driven: Any carrying roller driven by chain or other propelling medium.Idler: Any carrying roller of a live roller conveyor which is not driven.Tapered: A
37、 conical conveyor roller for use in a curve with end and intermediate diameters proportional to their distancefrom the center-point of the curve.Sprocket - A wheel with suitably shaped and spaced cogs, or teeth, to engage with the links of a chain.Driven: A sprocket propelled by the chain.Return Idl
38、er: A sprocket that supports the return run of the chain.Take-up - The assembly of the necessary structural and mechanical parts which provides means to compensate for stretch, orwear, and to maintain proper chain tension. Adjustment is usually manual and is employed on continuous chain driven liver
39、oller construction only.Transfer Medium - Any mechanism that transfers objects onto or off a conveyor line or from one conveyor line to another.Wearing Bar - A bar attached to a track or trough which may be replaced when worn, thus protecting the main members (chain)from damage due to wear.Width, Ef
40、fective Conveyor - The clear dimension across the conveyor bed and parallel to the carrying rollers where the unitload may be conveyed; on chain driven live roller conveyor, the dimension between side rail and chain cover plate.Section 2APPLICATION DATA1. GENERAL APPLICATION ENGINEERING DATAChain dr
41、iven live roller conveyors are used to carry loads with a flat, smooth, and firm bottom riding surface at controlledspeeds. They are better suited than belt driven live roller conveyors in applications where heat, dirt, oil, water, and othercontaminants are present. Chain driven live roller conveyor
42、s are ideal for carrying heavy or bulky loads.Conveyors may be spring mounted to absorb shock when being loaded or unloaded with heavy unit loads. They are idealconveyors when the application requires right angle transfers, such as disappearing chain transfers, push-on or push-off trans-fers, or con
43、verging sections.This construction is commonly used for the carrying bed of transfer cars, for powered beds in rollovers, upenders, dump units,turntables, and vertical reciprocating conveyors. Two sections of chain driven live roller may be tilted to form V-troughconstruction for handling cylindrica
44、l loads.Since power is transmitted to the carrying bed rollers by chain and sprockets, unit loads are always positively driven at acontrolled speed.2These conveyors work best when they are installed horizontally; however, depending on the unit load handled, they may beslightly inclined or declined.S
45、everal conveyors may be assembled in a line, and by controlling each conveyor, they can accumulate loads at zero storage linepressure by “cascading”, holding one load on each conveyor.Chain driven live roller conveyor may also be designed to accumulate loads by “indexing” or start-stop operation, re
46、sulting inzero storage line pressure between loads. Electric controls are provided at the receiving end of the conveyor to allow a load toindex forward onto the conveyor approximately one load length, then shutting down the conveyor. This indexing operation isrepeated until the conveyor is filled. T
47、he entire train of accumulated loads is then indexed, leaving an empty conveyor so theindexing cycle may be repeated.A combination of previously described “cascade” and “indexing” operations may also be used to provide accumulation at zerostorage line pressure.Ideally, three (3) rollers should be un
48、der the load at all times. Occasionally, two (2) rollers will be sufficient, depending on theunit load (product) handled. Carrying rollers are normally spaced 4“ to 12“ on centers. For centerlines between rollers greaterthan 12“, considerations may be required to compensate for chain sag between the
49、 rollers.Conveyors are normally run at speeds between 30 and 60 fpm; however, greater or lesser speeds may be used. For greaterspeeds, precision bearings and/or chain lubrication may be required. Chains and sprockets must be guarded.Fill-in plates may be added between the carrying rollers to assure that the leading edge of a unit load will ride on the carryingroller and not sag between rollers.There are many variations in drive arrangements. A common practice is to use a gear motor with output shaft connected by loopchain drive to the sprocket(s) on the drive roll(s). Another op
