1、CEMA STANDARD NO. 403-2003 ANSI/CEMA 403-2003 (R2009) Reaffirmation of ANSI/CEMA 403-2003 ( Approved January 22, 2009 ) Unit Handling Conveyors BELT DRIVEN LIVE ROLLER CONVEYORS ISBN 978-1-891171-25-3 Conveyor Equipment Manufacturers Association SAFETY NOTICE The Conveyor Equipment Manufacturers Ass
2、ociation has developed Industry Standard Safety Labels for use on the conveying equipment of its member companies. The purpose of the labels is to identify common and uncommon hazards, conditions, and unsafe practices which can injure, or cause the death of, the unwary or inattentive person who is w
3、orking at or 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 typical equipment, has been published in CEMAs Safety Label Brochure No. 201. The B
4、rochure is available for purchase by members and non-members of the Association. Safety Labels and Safety Label Placement Guidelines, originally published in the Brochure, are also available free on the CEMA Web Site at http:/www.cemanet.org/CEMA_Safety_Pg.htm PLEASE NOTE: Should any of the safety l
5、abels supplied by the equipment manufacturer become unreadable for any reason, the equipment USER is then responsible for replacement and location of these safety labels. Replacement labels and placement guidelines can be obtained by contacting your equipment supplier or CEMA. For Information on Com
6、pany Membership visit the CEMA Web Site at http:/www.cemanet.org Conveyor Chain CEMA ORGANIZATIONAL CHART Controls Palletizers Meet in March and/or September Conference Strategic Planning Insurance Meetings Marketing / Membership Statistics Finance and Budget Past Presidents Bulk Handling Section Co
7、mmittees Unit Handling Section Engineering Conference Conveyor Chain Performance T erminology Unit Handling Standards Idlers Pulleys Belt Systems Screw Conveyors Belt Manual Accessories Safety Controls T erms and Definitions International Standards Meets Each June Screw Conveyors Bulk Handling Compo
8、nents and Systems General Bulk Handling Section Bulk Accessories Unit Handling Conveying Section COMMITTEES BOARD OF DIRECTORS OFFICERSDISCLAIMER The information provided in this document is advisory only. These recommendations are provided by CEMA in the interest of promoting safety in the work pla
9、ce. These recommendations are general in nature and are not intended as a substitute for a thorough safety program. Users should seek the advise, supervision or consultation of qualified engineers or other safety professionals. Any use of this document, the information contained herein, or any other
10、 CEMA publication may only be made with the agreement and understanding that the user and the users company assume full responsibility for the design, safety, specifications, suitability and adequacy of the system component, or mechanical or electrical device designed or manufactured using this info
11、rmation.The user and the users company understand and agree that CEMA, its member companies, its officers, agents and employees shall not be liable in any manner under any theory of liability for the user or users reliance on these recommendations. The users and the users company agree to release, h
12、old harmless and indemnify CEMA, its member companies, successors, assigns, officers, agents and employees from any and all claims of liability, costs, fees (including attorneys fees), or damages arising in any way out of the use of this information. CEMA and its member companies, successors, assign
13、s, officers, agents and employees make no representations or warranties whatsoever, either express or implied, about the information contained in this document, including, but not limited to, representations or warranties that the information and recommendations contained herein conform to any feder
14、al, state or local laws, regulations, guidelines or ordinances.FOREWORD Belt driven live roller conveyors-conveyors which use a roller bed for the carrying surface and a belt as a driving medium- -are used for the controlled movement of a great variety of regular or irregular shaped loads, from ligh
15、t and fragile to heavy and rugged unit loads. The bottom furface of the load must beconveyable on a roller bed. The path is usually horizontal, but it can be slightly inclined or declined, limited only by the friction between the rollers, drive belt, and the load. Belt driven live roller conveyors c
16、an be operated at the speed best suited for the work being performed. They are used where unit loads are allowed to accumulate causing blocked line conditions, as a pacesetter for assembly operation, for loading on and off, for transportation, or as a timing medium for integrated handling systems. T
17、he purpose of this work is to establish certain minimum standards for use by concerns manufacturing or utilizing unit handling live roller conveyors. For additional information relating to definitions and selection of common components, see the latest edition of the following publications: CEMA Stan
18、dard No. 102, Conveyor Terms and Definitions; CEMA Standard No. 401, Belt Conveyors; CEMA Standard No. 402, Belt Conveyors; CEMA Standard No. 404, Chain Driven Live Roller Conveyors; CEMA Standard No. 405. Slat Conveyors; and CEMA Standard No. 406, Lineshaft Driven Live Roller Conveyors. The illustr
19、ations 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 omitted to permit clarity in showing the operational characteristics of the devic
20、e. Refer to the current editions of ANSI/ASME B20.1, Safety Standard for Conveyors and Related Equipment; ANSI/ASME B15.1, Safety Standard for Mechanical Power Transmission Apparatus; and ANSI Z244.1, American National Safety Standards for Lockout/Tagout of Energy Sources - Minimum Safety Requiremen
21、ts; Title 29,i CONVEYOR EQUIPMENT MANUFACTURERS ASSOCIATION 6724 Lone Oak Blvd Naples, Florida 34109 Web Site: http:/www.cemanet.org Standard No. 403 - Copyright 2009 Printed in the U.S.A. ISBN 978-1-891171-25-3 TABLE OF CONTENTS Section Page PDF DEFINITIONS 1 1 5 APPLICATION 2 9 13 TECHNICAL DATA 3
22、 12 16 ii CEMA Standard No. 403-2003 (R2009) Reviewed by the Unit Handling Section of the CEMA Engineering Conference Note - CEMA Has Reaffirmed the 2003 Edition. This 2009 Edition is Identical to the 2003 Edition SUMMARY OF CHANGES IN 2003 EDITION All drawings have been cleaned up and enhanced for
23、clarity where necessary. Foreword has been updated to include new Safety References. A Safety Notice regarding Industry Standard Safety Labels has been added. T erms and Definitions have been edited to conform with those in ANSI/CEMA 102 “Conveyor T erms and Definitions”. All Figures and charts have
24、 been redrawnand, in some cases, modified for clarity Section 1DEFINITIONSFor general definitions, see also CEMA Publication 102, Conveyor Terms and Definitions. MECHANICAL ELEMENTS Conveyor, Width - The dimension inside to inside (BF) of frame rails (see dimension B, Figures 1, 2 and 3, Page 4). Ov
25、erall width (OAW) of the bed (see dimension C, Figures 1, 2, and 3, Page 4). Drive - An assembly of the necessary structural, mechanical, and electrical parts which provide the motive power for a conveyor. Fill - In Plates - Closely fitted plates positioned between the rollers of non-powered or powe
26、red roller conveyor. Frame, Conveyor - The structural member which supports the machinery components of a conveyor. Guide Rails - Members paralleling the path of a conveyor and limiting the product on the conveyor to movement in a defined path. Hand - (1) the right hand or left hand of a conveyor is
27、 determined by facing the direction in which the material is flowing. In the case of a reversible conveyor, the hand is determined when the material is flowing toward the end closest to the drive. Horizontal Curve - A conveyor section used to change the direction of travel. Also, curved conveyor sec
28、tion equipped with a belt (round, “v“, hex, etc.) driving a series of rollers to change the direction of the unit load. The curved radius is measured to the inside face of the inside frame rail. The hand of the curve is determined by facing in the direction of the unit load and visually observing th
29、e unit load travel. Right hand curves transport unit loads to the right and left hand curves to the left. Pop - Out Roller - A special load carrying roller mounted in such a manner as to pop out when foreign objects are introduced between the belt and the roller. Roller Bed - A bed utilizing a serie
30、s of rollers and channels used to support a conveyed load. Roller; Carrier, Return, Pressure, and Gravity-A cylindrical member with internal bearings mounted on a non- rotating shaft. Carrying Rollers - A series of rollers used to support a conveyed load. Return Rollers - A series of rollers support
31、ing the return run of the conveyor drive belt. Gravity Rollers - A series of rollers used to carry a live load but not driven. Pressure Rollers - A series of rollers used for holding the driving belt in contact with the load carrier rollersin a belt driven live roller conveyor. Snub Roller - Any rol
32、ler used to increase the arc of contact between a belt and drive or tail pulley. Tracking training-The process of adjusting idlers, pulleys, and loading conditions in a manner which will correct any tendency of the belt to run other than centrally. BELTING Carcass-The fabric tension carrying portion
33、 of a belt, as distinguished from the cover. Covers-Material applied to the outer surfaces of a conveyor belt for protection of the carcass and, where required, to provide special load carrying frictional characteristics. Duck-A term applied to a wide range of medium and heavy weight fabrics, common
34、ly made of cotton or synthetic material, used to construct a conveyor belt carcass. 1Edge - Cemented - An application of rubber cement or other sealant over the raw or cut edge of a belt. Folded - A belt construction wherein an outer ply is folded around a carcass to cover the edges. Raw - The uncov
35、ered square edge of a belt created by cutting after vulcanization. Friction Surface - A rubber adhesive compound applied to and impregnating a conveyor belt fabric, to provide greater than normal traction. PIW - Belt strength is rated in Pounds (load) per Inch of Width. Ply - A layer of duck or cord
36、s used in constructing the carcass of a conveyor belt. Skim or Skim Coat - A layer of material applied to the belt fabric but not forced into the weave. Splice - Mechanical - A joint made by fastening two ends of belting together by means of metal hooks or plates. Vulcanized - A joint made endless b
37、y means of vulcanizing two properly prepared ends of the belt. Step - Each ply is cut back further than the previous on each end to allow overlapping and bondingof the plys. Finger - Each end is cut in a long finger pattern and bonded to allow maximum flexibility. Types of Belt for Belt Driven Live
38、Rollers Belt, Monofilament - A belt utilizing many single strands of untwisted synthetic fiber. Multiple Ply - Carcass is usually made with three or more plies of fabric bonded together by elastomeric material. May be furnished smooth covers top and bottom, rough-top, friction-surface, bareback, or
39、combinations using one type of surface for one side of the belt and another type of surface for the other side. Reduced-Ply - The necessary carcass characteristics are obtained using fewer plies than comparable multiple-ply belts. The carcass may be made as a single unit or from plies, usually two,
40、of nylon, polyester, or combinations of these synthetics. When more than one ply is used, they are bonded together as in multiple-ply belts but with heavier skim coats between the plies. Covers available are similar to those for multiple-ply belts. Ripple belt - A special belt with raised pads space
41、d at uniform intervals along its length. Only the pad surface contacts the carrier rollers. Solid Woven Cotton-Layers of warp threads are woven with layers of filler threads and bound together in the loom with binder threads. There are no distinct plies, but the layers of warp threads are often coun
42、ted as plies. They may be used with or without treatment or impregnation. Solid Woven PVC-Single-ply, solid woven carcass made from nylon, polyester. or combinations thereof, impregnated and coated with PVC (polyvinyl-chloride) plastic. Stitched Canvas-Several plies of the fabrics (usually cotton du
43、ck) are stitched together and normally treated by immersion in special compounds. V-belt - A belt with a cross section in the general shape of a trapezoid. Specifications and testing methods for various belting materials can be found in one of the following references: ASTM D 413 Method for Testing
44、Rubber Property Adhesive to Flexible Substrates ASTM D 378 Method for Testing Rubber Belting, Flat Type ASTM D 430 Methods of Dynamic Testing for Ply Separation and Cracking of Rubber Products 2PulleysSee also latest edition of ANSI/CEMA B105.1, Welded Steel Conveyor Pulleys Balanced-Wobbling and tr
45、acking problems suggest that the drive and tail pulley may need to be spin balanced. Static-The manipulation of the center of gravity of a pulley to fall along the axis of rotation from rest (usually requested from 150 to 299 FPM ). Dynamic-The manipulation of the center of gravity of a pulley to fa
46、ll along the axis of rotation at high speed (usually requested at 300 FPM and above). Hub Compression-A removable hub for shaft replacement that wedges around the shaft when installed. Bearing-Internal bearings in the pulley shell which are used on a non-rotating shaft. Disk-Round plates with a hole
47、 in the center for welding the pulley shell to the shaft, non-removable. Key-A square metal stock that transmits torque at the shaft to hub connection. Lagging-A smooth or embossed covering or coating applied to a pulley to reduce belt slippage and wear. Typical thickness are 1/4“ to 3/8“ with a dur
48、ometer hardness of 55 to 65 shore A scale. Higher hardness is available by the manufacturer. Pulley -A cylindrical member with or without a crown face mounted on a revolving or fixed shaft (See also Pulley; Drive,Tail, etc.). Pulley, Crown - A pulley with differential diameters used for belt centeri
49、ng. Formed-A process that utilizes forming processes to push out or in the diameter difference. Machined-A process of removing the outer shell material to the diameter difference. Pulley, Drive-A pulley mounted on the drive shaft that transmits power to the belt with which it is in contact. Pulley, Powered Drive-A pulley mounted with internal motor and reducer that transmits power to the belt with which it is in contact. Pulley, Shell-A cylindrical member with or without a crown that is attached to hubs and a shaft. Pulley, Tail-A pulley mounted a
