Belt Conveyor Pulleys Manual

~~of their choice, be it the CXTB, Dodge "taperlock" or a.D.The pulleys described herein are those meetingstandard specifications. They are by no meansa limit to Continental's abilities in the enginee-red class applications as custom pulleys aredesigned and fabricated to meet customersindividual requirements whenever necessary.VIEWS BELOW SHOW MANUFACTURING AND ASSEMBLY AREAContinental Conveyor & Machine Workslimited have been manufacturing bulk materialhandling equipment to both CEMA and customspecifications in their Thetford Mines plantsince 1963. The fully equipped, modernfabricating and machining facilities lend them-selves well to the production of high quality,precision engineered products to serve the bulkmaterial handling requirements of today's indus-try.This catalogue is designed to aid the conveyorpulley user in selecting the proper pulley fortheir particular application while at the sametime allowing the flexibility of the hub systemAbove are several views of the manufacturingprocess of a crowned faced pulley. Initially, thesteel rim is rolled to a concentric circle in crownfacing rolls specially constructed for the pro-duction of conveyor pulleys.discs are welded to the interior of the rim.Following this operation, the end discs aremounted using a shaft with a continual keywayto assure perfect aligment of the bushingkeyways.The entire assembly is then hydraulically drawntogether and welded to form a concentric drum.In the final welding operation, the pulley isplaced on a special machine that turns thepulley at a precise speed, depending on thediameter, to ensure a perfect, high penetrationweld between end disc and rim.The pulley is then meticulously checked andverified to CEMA specifications prior to shippingto ensure complete customer satisfaction.Following this operation, end discs are precisionflame cut on a specially constructed cuttingmachine. To assure perfect concentricity, thehub is first mounted in the end disc where uponthe entire assembly is then cut to the requireddiameter. This process assures a negligeabledeviation in diameter and thus a more concen-tric conveyor pulley.Large intermediate and center discs are used onall conveyor pulleys with the exception of thosehaving small diameters and face widths.These3Continental welded steel conveyor pulleys are availa~ble with CXTB, DODGE "taper lock" or O.D. hubs.DETAILS BELOW SHOW DIFFERENCES IN CONSTRUCTION DEPENDING ONHUB SYSTEM.CONTINENTAL O.D. HUBSQ. D. BUSHINGSplit cast iron type with 3/4" taperper foot. Shaft keyed to bushing,bushing not keyed to pulley hub,torque transmitted through selflocking taper.CONTINENTAL CXTH HUBSCXTB BUSHINGSplit taper of either malleable orcast iron type, 2" taper per foot.Shaft keyed to bushing, bushingnot keyed to pulley hub. Torquetransmitted through bolts.DODGE "TAPER LOCK"Split taper cast iron bushing 80taper per foot. Shaft keyed tobushing, bushing not keyed topulley hub. Torque transmittedthrough bolts.~UB NO. CK-25CK-30CK-35CK-40CK-45CK.50CK-60CK-70CK-80CK-l00BUSHIN~NO.25'i73020353540404545505060507060806510085.~BORE~ ~~NG~ I1/2" to 2.1/2" dia.7/S" to 3" dia.1.3/16" to 3.1/2" dia.1.7/16" to 4" dia.1.15/16" to 4.1/2" dia.2.7/16" to 5" dia.3.7/16" to 6" dia.3-15/16" to 7" dia.4.7/16"toS"dia.7" to 1 0" dia.p Q1-3/4':Z"3-1/Z"4"4-1/Z"5"5"6"6-1/Z"8-1/Z"R*1/8"3/8"1-1/8"1-1/2"1-7/8"2-1/4"2-5/8"2-5/8"2-5/8"1"1"1"1"1"1"2-1/4"2-1/4"2-1/4"2-1/4".Minimum space required from pulley rim to loosen bushing using screws as jack screws. nopuller required.4CONTINENTAL DODGE HUBSContinental welded steelCXTB hubs and bushings.withconveyorThe 2" per foot taper of the CXT provide a 12 to 1 locking ratio on the shaft. Theadvantages of the CXT system are its high lateral holding power and its minimuzation ofend disc prestressing. Most torque however is transmitted through the bushing flangeand cap screws.[~~,.-~c~lY.Key furnished for these sizes onlyBUSHING SPECIFICATIONSHUB AND CORRESPONDING BUSHING HUB BOLT TORGUEHUB BUSHING HUB BUSHING iiCXTB50ICXTB60CXTB70CXTB80CXTB100HUBCXTH25CXTH30CXTH35CXTH40CXTH45in. Ibs.35055084012001680HUB In.lbs.30004800720090009000CXTH25CXTH30CXTH35CXTH40CXTH45CXTB25CXTB30CXTB35CXTB40CXTB45CXTH50CXTH60CXTH70CXTH80CXTH10GCXTH60CXTH60CXTH70CXTH80CXTH100,J5~~-juLBUSHING AND KEYSEAT DIMENSIONSContinental welded steel conveyor pulleys with a.D.hubs and bushings.,-The 3/4" per foot taper of the 0.0. provides a 32 to 1 locking ratio on the shaft. Theadvantages of the 0.0. system are its superior holding power in both lateral and tor-sional directions, its ease of assembly and disassembly and its self locking taper. Thelarge CJp screws provide enough force to lock the taper so that no external keys arerequired between mating sections.~ul-BUSHING AND KEYSEAT DIMENSIONSBUSHING SPECIFICATIONSHUBCHKCHECHFCHJCHMin. Ibs.156075135225HUBCHNCHPCHWCHSIn. IDS.3004506007506The 1-1/2" per foot taper of the "taper lock" provides a 16 to 1 locking ratio on theshaft. The advantages of the Dodge system are its availability, its superior torsionalholding power when using a key and its greater load rating due to the small inset that isrequired.L~~"BUSHING AND KEYSEAT DIMENSIONS.Key furnished for these sizes only.BUSHING SPECIFICATIONSHUBANDCORRESPONDING BUSHING HUB BOLTTOROUEHUB~CKCKCKCKft.lbs.366784142205HUBCK 50CK 60CK 70CK 80CK 100ft. Ibs.2586526526521142)./72530354045APPROXIMATE WEIGHTS IN POUNDSPUllEY' I ContinentalDIA. HUBDODGEHUBCK-25CK-JOCK-J5n.D.HUB--tHK.tHECHK.tHEtHFtHK.tHEtHFCHK.tHEtHFFACE WIDTHS IN INCHES26 30 32 36 38 4613914315816817218118551~5i. 155 165182186195199541581621721901942032075716516917919820221121560 63 66CXTH 25CXTH 30CXTH 3512 14 1& 1847 50 53 5751 54 57 6160 63 6& 7020 22 2461 65 68165 69 7274 78 81828695858998103101116120123121135181929610511111517412813213614419440 4495 121 T32102 131 136108 135 14510CXTH 25CXTH 30CXTH 35CXTH 40CK-25CK-30CK-35CK-40CK-25CK-30CK-35CK-40CK-25CK-30CK-35CK-40CK-25CK-30CK-35CK-40CK-25CK-30CK-35CK-40CK-50CK-25CK-30CK-35CK-40CK-50CK-6051 62 6661 66 1069 14 1814 18 837074828778829196919510411012212613514074788691838796101 i97101;10116130134143148788290958892101108102106115121138142151156158162171176197198202210215236282297301317342371417828694999397106111108112121127175 I79 I88 90 9994 103103 112107 11611511912813213114114920014615015916315716117017418819220022012CXTH 25CXTH 30CXTH 35CXTH 4064687782 i75798894971011101156973828780849399106110119124108112120127127131140145118122130174139143152157175179187207204 2201 230 208 224 234216 232 242238 254 264240244252274280284292302i..78I879286909910511411812713214CXTH 25CXTH 30CXTH 35CXTH 40CXTH 25CXTH 30CXTH 35CXTH 40144 155 161 203 218 239 258 269148 159 165 207 222 243 262 273157 165 174 t16 231 251 270 281162 173.179 227 242 261 280 291291295JOJJIJ30230631432434035235636032633033834736938138438816CHK.CHECHFCHK.CHECHFCHMCHK.CHECHFCHM.CHK.CHECHFCHM.14tiI15015911641681172182186207209213220225246292314318324359379425lBB192201205217,221230234255196200209213226230239243264212216225229245249258262283221225234238254260267271292229233242246258268276280301245249258262276286294298319346350360364443489561566571575588634817867886930103913211087109211371245166715061508,11610195018CXTH 25CXTH 30CXTH 35CXTH 40CXTH 501131171261311521461501551601221261351401611561601661711401441531581791491531621671881881921992042252712802843001325360406290 303 315 327294 307 319 339302 315 317 343306 319 321 347329 342 356 368 382 417339 352 366 378 392 427347 360 374 388 402 437351 364 378 392 406 440372 385 399 413 427 46120CXTH 25CXTH 30CXTH 35CXTH 40CXTH 50CXTH 60111181188193214260263261283308343389249253262266286332399403419423436482281285295299319365450454470474487533302306316320340386484488504508521567313317327331351397500504520524537583324328338342416462527532537541554600412416428431519565'm783789793811851950104010581100120214841303131113531456192820822084217822764284324454485405868061813 8198238418879861107610941136123815201348135413961797198521472149224323414431447,4611464560:60618358421849853871917102111131131 i1173 1275155713901397143918542042221222142308240645947748058067672286187918831901 i91996510571149116712091311 I159314321439148119112099227722792373247141514931496;6006961428929109149329509961093118512031245134116211415148215241968215623422344243825365235415446517477939831001100510211039108511281221132613671462174416311644168521592342259325952682277424CXTH 25CXTH 30CXTH 35CXTH 40CXTH 50CXTH 60CK-25CK-JOCK-J5CK-40CK-50CK-6021321723325827832422923324927429434024625026629132637230CK-35CK-40CK-50CK-60CK-70CK-80CK-40CK-50CK-60CK-70CK-80CK-50CK-60CK-70CK-80CHECHFCHM.CHPCHWCHfCHM.CHPCHWCXTH 35CXTH 40CXTH 50CXTH 60CXTH 70CXTH 80327 347 367 387 407 427 446 551 591 611 651 671392 415 440 464 488 512 537 649 698 722 771 795413 436 461 485 509 533 558 668 717 741 790 814507 531 555 579 604 712 761 785 834 858646 670 694 719 821 870 894 943, 967828 952 976 1001 1103 1152 1176 1225112497448198388829911273103010351080118815911442144315451863365976026497631045854899625630677791108388793210426~46591068201121919964101413006806811I134[84811599529911101131383083588098813261174121613181561887892937104514021239128113831647915921966101414401272131414161690972978102311311515137613781480177799910061051115915531409141115131820CXTH 40CXTH 50CXTH 60CXTH 70CXTH 80CXTH 50CXTH 60CXTH 70CXTH 8042CHM.CHPCHW48.INDICATES THAT NEXT LARGER SIZE HUB AND BUSHING IS USEDWhen ordering shafting, please specify the followinginformation and if possible include a sketch similar tothe one appearing below. This additional data willhelp elliminate errors.') Diameter and length.2) Number and sizes of keyway required.3) Shaft length on either side of the pulley, mea-sured from the edge of rim.4) Diameter and length of journal if required.Please note that excessive shaft deflection is the maincause of pulley failure. It is therefore recommendedthat one be generous when selecting shaft sizes. It isalso important to remember that while alloy steelincreases shaft strength, it should not be used to decrea-se shaft diameter.The shafting specified for use with Continental con-veyor pulleys is AISI 1045, a high carbon steel with atensile strength of approximately 105,000 Ibs. persquare inch. This material is particularly well suitedfor applications requiring high grade transmission asthe carbon content makes it one of the strongest steelsin the carbon range (excluding alloy steels) and itmachines to an extremely smooth finish.817217618518919920321221623727027428228630631632432834938538940140448553172673273874276\\180689098099810401142142412341240128213851833197419762070216813113514414917016711711771182203249270274284288308354433437453457465511FOR DETERMINING PULLEY AND SHAFT SPECIFICATIONS(Drive and Non-Drive Pulleys)This quick reference source will enable the reader to select the right pulley and shaftfor a conveyor system. It has been prepared and used by experienced pulley engineers whoknow the importance of preventing conveyor breakdown by properly matching pulleys andshafts to the system.zontally in the shaft size column. We followthis procedure for each pulley.7. Next, we divide Tl and T3 by the belt width.This gives us PIW for both the Drive {Tv andNon-Drive (T 3) Pulleys.Then using Table VII, we select a pulleydiameter with an allowable PIW greaterthan our computed PIW for each pulley.8. Using Table VIII we again select pulleydiameter by finding a diameter with max-imum shaft size as large or larger thanour computed shaft size, doing this foreach pulley.9. Select the larger of the two diameters foundin procedure 7 and 8 for each pulley.EXAMPLE1. From Table I: 100 H.P. @ 300 F.P.M.=ll,OOO#100 x 33,000(Te). Also 300 -= 11,000#.1. Find the appropriate Horsepower coll:Jmn onTable I. Look down F.P.M. (Feet Per Minute)column until belt speed of conveyor cor-responds. Read across to Horsepower col-umn. This number is T e (Effective Tension)of conveyor system. Also Te = HP x 33,000F.P.M.2. Find the appropriate K factor from TableII. The K factor has to do with the type ofdrive and take-up of the conveyor system.Take this K factor x (times) T e. This is T 2 orT J (Slack Side Tension) for the conveyor sys-tem. T 2 is associated with the Drive Pulley,and T J is associated with the Non-DrivePulley(s).3. For Non-Drive Pulley(s), determine the arcin degrees the belt contacts each pulley.Then using Table III for each Non-DrivePulley, determine the individual factor foreach. Take this factor times T J. This givesthe resultant load for each Non-DrivePulley.4. For Drive Pulley, add T 2 and Te. Thisequals T 1 (Tight Side Tension) for the DrivePulley. Then divide T 1 by T 2' This equalsratio for Table IV. Determine the arc of con-tact the belt makes with the Drive Pulley.Read down the Ratio Column until corres-ponding ratio is found; thE:n go across toArc of Contact Column. Take this newfactor times T 2. This gives resultant loadfor the Drive Pulley.5. From Table V find the desired belt width.Recommended pulley width is given incorresponding column.6. To determine shaft size, use Table VI (a),or VI (b), (allowable shaft load). The tableis computed for Non-Drive Pulleys, (shaftswith 8000 psi allowable bending stress).For Drive Pulleys, we multiply allowableload column by 0.75. In effect, this allows6000 psi stress for Drive Pulleys.Still using Table VI (a or b), we take thebearing centers of the pulley and subtractthe face width. This number is used in the"Bearing Centers-(Minus) Face" columns.Next, using the resultant load we go downthe "Bearing Centers-(Minus) Face" col-umn until the value for allowable load isgreater than our computed resultant load.The corresponding shaft is listed hori-2. From Table II: Snubbed Drive, Lagged Drive,Automatic Take-up, K Factor = 0.38. 0.38 x11,000# = 4180# (T 2 or T 3).3. The Non-Drive Pulleys have the following de-grees of wr?p:Snub: 30. Bend No.1: go.Tail: 180. Bend No.2: 90.Take-up: 180.9KNOWN:100 Horsepower 2100 wrap on head e300 F.P.M. 42" BeltHead Drive 60" Bearing CentersLagged Head Pulley Browning or O.D.Automatic Take-up HubsTO FIND:T 1, T 2 and T 3Resultant Load for each PulleyShaft Size for each PulleyWidth of PulleysDiameter for each Pulley7. T1 = 15,180# (15,180# -7 42" = 361 Ib./in.)T3 = 4,180# ( 4,180# + 42" = 100 Ib./in.)Using Table VII, we need a 30" Pulley for theDrive and 6" for the Non-Drive.8. By using Table VIII and maximum shaft sizes,we see we need a 24" pulley for the Drive, 14"for the Tail and Take-up; 10" for the Bends, and6" for the Snub.From Table III, the Bend Pulleys have a factorof 1.41422. 418Q# x 1.41422 = 5911#. This isthe resultant load for the Bend Pulleys.Also from Table III, factor for the Tail andTake-up Pulleys is 2.00000. Therefore, 2.00000x 4180# = 8360# (resultant). The Snub Pul-ley has a factor of 0.51764. 4180# x 0.51764 =2164# (resultant).4. For the Drive Pulley, Te + T2=15,180# (TJ.T 1 -:- T 2 = 3.63 (ratio). From Table IV using210. wrap column and 3.63 ratio, we get a newfactor of 4.5238 by interpolation. Then take4.5238 x 4180# = 18,909# (resultant).9:. Therefore, we would select a 30" Drive (whenttlere is a choice of diameters, always use thelargest), 14" Tail and Take-up, 6" Snub and10" Bends.NOTE: It is also important to examine the beltmanufacturer's recommendations for pulley di-ameters. Even though the Continental Pulley isdesigned to support these loads, the belt manu-facturer may require a larger diameter pulley tolessen the belt bending factor imposed by thesmaller pulley. If their recommendations arehigher for pulley diameter, their recommendationsshould be followed to prevent belt damage. Inthis instance if a belt rated at 440 pounds perinch of width were to be used, the manufacturerwould suggest minimums as follows: 30" for Head,18" Tail, etc.5. Since we have a 42" belt we can see from therecommended pulley width in Table V that weshould use a 44" wide pulley.6. We have a distance of 16" for bearing centersminus face (60 -44 = 16). With a load of 5911#for the Bend Pulleys, Table VilA) indicates a3-15/16" shaft is neededThe Snub Pulley has a resultant of 2164# (16"bearing centers minus face). Use a 27-{6"shaft..The Tail and Take-up have resultants of 8360#;therefore, 4-7/16" are selected.We use a factor of 0.75 for designing the DrivePulley shaft to 6000 psi. We divide the result-ant by this factor. 18,909 -7- 0.75 = 25,212. A6" shaft with bearing centers minus face of 16"has a load rating of 27697 which is the smallestavailable without dropping below this 25,212.PULLEY SCHEMATIC FOR TYPICAL CONVEYORSYSTEM/ PULLEY DIMENSIONAL SYMBOLS10FACTOR IIK11NOTE: For wet belts and smooth lagging, use bare pulley factor.For wet belts and grooved lagging, use lagged pulley factor.If arc of contact is unknown, assume the following: Type of drivePlainSnubbedTAB L E Dual or tandemAssumed arc of contact180021003800RESULTANT LOAD FACTOR-NON-DRIVENOTE: R = T 3 X Factor11132 4 ;SHAFT LOADSNOTE: Above tension ratings may be used for any arc of belt contact.T~MA.TABLE VI b1. Diameter and Face Width2. Crown and Type of Pulley (wing or3. Unlagged or Lagged (type lagging)4. Shaft Diameter (if specified)5. Hub Size and Type6. Bearing Centers7. Belt Width8. Position of Pulley in the Conveyor9. Arc of ContactDATA REQUIRED TO DETERMINE PULLEY SPECIFICATIONS12TABLE VlSHAFT SIZES~-BEARING CENlI'4 16--PULLEY DIAME1ERI, ES)IIITAPER-LOCK (i)H U B Sor Elevator1302180230925156774910872149031828324563302723780946504564386512577307909210604:10. T)o T, or T, (if not(A) Type of Ti .--(B) Drive Pulley ~ -, .--(C) Drive Pulley Arc ot1D) F.P.M.'(E) I-PUI(2) Center to center distance(3) Lift in feet-DIAME1E.HES}-iorsepower (if not known, give the following)30--MAXIMUM BELf ENS ION(POU~ DS-P.I.W.)give the foilc \\, or gravity)or Un laggedContact32 3: 36MINUS) LACE'/0 '/2(1) T.P.H.LE Vi.BELT TE/\\fSIONContinental welded steel wing type self cleaning con-veyor and elevator pulleys.( Continental Conveyor Wing Pulleys are ruggedly constructed with a heavy centertube taking the direct load from the wing plates and transmitting this load throughhubs to the shaft. The sloping wing plates automatically shed the material to eachside of the pulley thus preventing build-up on the pulley face which can cause con-siderable damage to the belt, Welded steel wing type pulleys are recommended fortail shafts of belt conveyors and the boot shaft of bucket elevators.DODGE "TAPER LOCK"CXT AND C.D.TYPE HUB AND r ~- FACE ~ --l TYPE HUB ANDBUSHING i BUSHINGl .i'\\'\\""B~IDIA.~I-pCONTINENTAL 0.0. HUBSQ. D. BUSHINGSplit cast iron type with 3/4" taperper foot. Shaft keyed to bushing,bushing not keyed to pulley hub,torque transmitted through selflocking taper.HUB BUSHINGNO. NO.CH-K SK Ill"" 10 2-1/2" dia. 3/4" 1.7/S" 1-5/8"CH.E E 7/8" 10 3.7/16.' dia. 118" 2-5/S" 2-5/16"CH-F F 1" 10 3-15/16" dia. 15/16" 3-5/S" 3-1/4"CH-J J 1-7/16" 10 4-1/2" dia. 1-1/16" 41/2" 4"CH-M M 2" 10 5-1/2" dia. 1-9/16" 6-3/4" 2-7/32"CH-N N 2-1/2." 10 6" dia. 1-1/4" S.I/S" 2-1/2"CH-P P 2-15/16"107"dia. 1" 9-3/S" 3"CH.W W '4-7/16" 10 8-1/2" dil- 1-1/4" 11-3/8" 4-3/18"CH.S S 6" 10 10" dia. 1-3/1" 15-3/4" ~15/18",.-CONTINENTAL CXTH HUBSCXTB BUSHINGSplit taper of either malleable orcast iron type, 2" taper per foot.Shaft keyed to bushing, bushingnot keyed to pulley hub. Torquetransmitted through bolts.CXTH25 CXTB25 1"102-1116" 1-3/16" 1-118" 11/16"CXTH30 CXTB30 1-1116" to 2-15/16" 1-1/16" 2-1/16" 1-1/16"CXTH35 CXTB35 1-15/16"103-1116" 1-13/16" 2-15/32" 3/8"CXTH40 CXTB40 2-1116"103-15/16" 1-11/161 2-13/32" 1/8"CXTH45 CXTB45 3-1116"104-1116" 1-1/16" I 3-5/16" 1-5/8"CXTH50 CXTB50 3-15/16"104-15/16" 2" 3-314" 1-1/B"CXTH60 CXTB60 5-1116" to 6" 1-1/16", 4-1/8" 2"CXTH10 CXTB10 6-1116" to 1" 1-1/8" 2-1/2"CXTHBO CXTBBO 11-1/2" to 8" 1-114" 2-15/16"CXTH100 CXTB100 8-1/2" to 10" 1-3/8" 2-13/16"~ CONTINENTAL DODGE HUBSDODGE "TAPER LOCK"Split taper cast iron type 1-1/4"taper per foot. Shaft keyed tobushing, bushing not keyed topulley hub. Torque transmittedthrough bolts.(14FOR DETERMINING PULLEY AND SHAFT SPECIFICATIONSThis quick reference source enables the reader to select the proper pulley andshaft for wing applications. It has been prepared and used by experienced pulleyengineers who know the importance of preventing conveyor breakdown by pro-perly matching pulleys and shafts to the system.1. From Table I: 100 H.P. at 300 F.P.M.=11,OOO#(Te).Also 100 x 33,000 = 11 000#300 ,.2. From Table II: Snubbed Drive, Lagged Dri-ve, Automatic Take-up, K Factor is 0.38.0.38 x 11,000# = 4180# (T 3)'3. Slack Side Tension (T 3) divided by beltwidth is 4180# + 42 = 100 P.I.W. Thus fromTable III a 16" diameter pulley has a P.I.W.rating equal to for greater than calcultedP.I.W. The belting manufacturer's recom-mendations for minimum pulley diametermust also be considered and the larger ofthe two should be selected.4. Since we have a 42" belt we must have a pul-ley face width two inches wider. Thereforewe use a 44" wide pulley.5. The Non-Drive Pulleys have the followingdegrees of wrap:Snub: 30' Take-up: 180"Tail: 180" Bends: 90"From Table IV, the Snub Pulley has a factorof 0.51764. 4180# x 0.51764 = 2164#. This isthe resultant load for the Snub Pulley. Alsofrom Table IV, factor for the Tail and Take-Upis 2.00000, therefore, 4180# x 2.00000 = 8360#(resultant). The Bend Pulleys have a 1.41422factor. 4180# x 1.41422 = 5911# (resultant).6. Bearing Centers -(Minus) Face for all pul-leys: 60" -(Minus) 44" = 16". From Table Vthe shaft size for the snub pulley would be2-11/16" (Allowable Load of 2350# is greaterthan Calculated Load of2164#). FortheTailand Take-Up a 4-7/16" shaft is required.(9360# being greater than 8360#). For theBend Pulleys a 3-15/16" shaft is required.(6690# being greater than 5911#).1. The Effective Tension (Te) for a conveyorsystem is found in Table I. Locate the appro-priate Horsepower column and lo'ok downthe F.P.M. (feet per minute) column untilbelt speed of the conveyor corresponds.Read across to Horsepower column. Thisnumber is the Te of the conveyor system.Also Te= HP x 33,000F.P.M.2. Find the K factor for the conveyor fromTable II. The K factor has to do with the typeof driv~ and take-up of the system. Take thisK factor x (times) Te. This result is T 3 (Slackside tension) for the conveyor system.3. Having found the maximum slack side ten-sion (T 3)' divide T 3 by the belt width. Thiswill be the calcul~ed tension in pounds perinch of belt width (P.I.W.). Select a pulleydiameter from Table )11 (Wing Pulley Allo-wable Tensions) which has a P.I.W. ratingthat is equal to or larger than the calculatedP.I.W. .4. Pulley width in most cases will be the sameas that of the drive pulley in the system.(Two inches wider than the belt for belts upto 42" wide; three inches wider than the beltfor belts over 42" wide).5. To calculate the resultant load, first deter-mine the arc in degrees the belt contactseach pulley. Then using Table IV (ResultantLoad Factor) find the individual factor foreach. Take this factor x (times) T 3. This gi-vesthe resultant load for each of the pulleysin question.6. To determine shaft size, use Table V (WingPulley Allowable Shaft Loads). The table iscomputed for shaft stresses of 6000 psi. For8000 psi bending stress use a 1.33 multi-plier. Still using Table V, take the bearingcenters of the pulley and subtract the facewidth (See Figure 1). This number is used inthe "Bearing Centers -(Minus) Face" co-lumns. Next, using the resultant load obtai-ned in step 5 go down the proper "BearingCenters -(Minus) Face" column until thevalue for allowable load is greater than thecomputed resultant load. Select the corres-ponding shaft listed horizontally in the shaftsize column.15EXAMPLEKnown:100 Horsepower 210 Wrap on HeadPulley42" Belt~ .60"Bea .rlng Centers on allPulleys300 F.P.MHead DriveLagged Head PulleyAutomatic Take-upTo Find:Te and T 3Diameter of each PuteyWidth of Pu.1J.eysResuftantLoad of each PuJleyShaft Size for each PulleyEFFECTIVE TENSION TeFACTOR II KI1NOTE: For wet belts and smooth lagging, u~.e bare pulley factor.For wet belts and grooved lagging, use lagged pulley factor.If arc of contact is unknown, assume the following:Type of drivePlainSnubbedDual or tandemAssumed arc of contact180021003800ALLOWABLE SHAFT LOADSFOR CXTH; DODGE AND O.D. HUBS* Pounds of Tension Per Inch of Belt Width16TAB.LE IVRESULTANT LOAD FACTOR-NON-DRIVE~NOTE: R = T 3 X FactorWING PULLEY ALLOWABLE TENSIONSAllowable Shaft Loads for 6.000 psi Stress (Use Multiplier of 1.33 for 8.000 psi Stress)17(18VULCANIZED RUBBER LAGGINGVulcanized rubber lagging without cloth fabric is applied directlyto the pulley face by the vulcanizing process. The finished rubbersurface has a cloth impression left on it. Lagging is primarily usedin conditions that necessitate increasing the tractive capacity ofthe pulley in drive applications or for resisting abrasive conditionson other pulley applications. Standard lagging is of 60 durometershore A material and is available in thicknesses of 6, 10, 16, -20and 25 mm. The tolerances of vulcanized lagging are 4 mm onthe rubber thickness. Due to these tolerances, it is thereforepossible that a pulley have a high crown, flat or even concavesurface at certain points even though the pulley had a perfectcrown prior to lagging. The fact that rubber displaces can alsohave on effect on the crown since in high tension application, acertain amount of the crown can be pressed out. If you have anapplication that requires exact tolerances, we suggest you specifya machined lagged pulley.HERRINGBONE RUBBER LAGGINGHerringbone lagging is applied to increase the tractive capacityof the pulley under wet or dirty conditions in which plain laggingwould not be sufficient for the task. The herringbone designhelps avoid build up of foreign material between the belt andpulley surface thus lowering the belt wear and minimizingalignment problems.The minimum thickness that can be effectively grooved with theherringbone pattern is 10 mm. As with plain lagging, the samerubber specifications and limitations apply. Therefore if exacttolerances are necessary, a machined lagged pulley is advisable.HOLZ SUDELAGA quality rubber lagging is bonded directly to special tractionpads which in turn are fitted to the pulley rim by special retai-ning bars. This system allows new lagging to be installed on thepulley without removing it from its position on the conveyor.LAGGED WING PULLEYSA lagged wing pulley is used in cases involving build up of materialbetween the conveyor belt and pulley causing belt misalignmentand excessive wear. It can also be used in cases requiring a greatertractive capacity between belt and pulley. The lagged wing pulleyprinciple works as follows. Upon contact with the belt, therubber on the wing tip compresses, when tension is releived itimmediatly returns to its original shape thereby cleaning itself inthe process. These wing tip rubber sections are easily replaceable.19SPIRAL. DRUM PULLEYSThis unique design reduces belt wear and misalgnment. As withall self cleaning pulleys, rotation automatically starts the cleaningaction discharging foreign material to the sides of the conveyor.The Continental spiral drum pulley is formed by a pair of verticalsteel flat bars helically wound around a drum, having both begunfrom the opposite extremities of the pulley and meeting in themiddle. There is a uniform pitch to these helices and thus mate-rial is uniformly discharged. This design reduces the possibilityof material build up between the belt and pulley in applicationwhere a self cleaning wing pulley is not practical.SPIRAL WING PULLEYSThe spiral wing pulley is used in applications that necessitatereducing material build up between the belt and pulley while alsoutilising the wing principle of the self cleaning pulley. Thecleaning action begins automatically when rotation begins andmaterial is discharged to both sides of the conveyor. The spiralwing pulley is constructed by helically winding a pair of flat steelbars around the wing pulley; having begun at opposite extremitiesand r:neeting in the center. This design minimizes belt mis-alignment afld decreases belt wear. It can be supplied in either flator crown face in most standard sizes.\\-ISPECIAL DRUM TYPE pULLEYSSpecial modifications can be made to standard pulleys in orderto suit individual customers needs. To the right we see a pulleymodified with retaining rims to assure belt alignment in the headsection of a bucket elevator.SPECIAL SELF CLEANING PULLEYSContinental will engineer pulleys for any special application thatmay be required. The pulley shown here to the right necessitatedentire stainless steel construction and an entirely open design as itwas to come in contact with an acidic bath.0 2021Elevator pulleys.Continental welded steel elevator pulleys are manufactured to close tolerances andare designed to withstand high shock loads. A one piece single disc construction isused in which the rim is continuously welded, on both sides, to the center disc. Thisassures maximum strength with a minimum of deflection. Several models includingsplit type and heavy duty are available in addition to the standard models. Anengineered class is also available to suit any application.The standard range of single disc elevator pulleys incorporate either the 0.0. or theCXT hub and bushing systems. These ensure the greatest possible holding powerfor single hub applications. The Dodge "taper lock" however is available on request.Shaft size must be given careful consideration in the selection of single disc elevatorpulleys since the load is concentrated at one particular point on the shaft. As withconventional welded steel conveyor pulleys, a variety of lagging including plain,herringbone and rough top is available.* 8" FACE 9" FACE "" FACEDI~ HUBtHKtHEtHFtHJtHKtHEtHFtHJtHKtHEtHFtHJtHEtHFtHJtHMtHEtHFtHJtHMtHEtHFtHJtHMtHEtHFtHJtHMA 0 IWT A 0 Iwr WT3.3/8 1-7/8 3-3/4 1.15/32 542.31/32 2.5/8 3-13/32 2.5/1& &02.13/1& 3-5/1 M/I& 2.5/8 &&2.19/32 4.1/2 1.21/32 2.29/32 7&3-3/8 1.7/1 3-3/4 1.15/32 &32.31/32 2.5/1 3-13/32 2.5/1& &82.13/1& 3-5/1 M/I& 2.5/8 752.19/32 4-1/2 1.21/32 2.21/32 843.11/32 1.7/1 3-25/32 1.15/32 772.15/1& 2.5/1 3-7/1& 2.5/1& 822-25/32 3.5/1 2.19/32 2.5/1 89M/I& 4-1/2 1.15/1& 2-29/32 982.15/1& 2.5/8 3-7/1& 2.15/1& 11&2-25/32 3-5/1 2.1913Z 2.5/1 1222.1/2 4-1/2 2 2.21/32 1322 5-11l 1.11l 3.7/32 1642.21/32 2.5/1 3.15/32 2.5/1& 1812.3/4 3-5/1 2.5/1 2.5/1 18&2.1/2 4-11l 2 2.21/32 195Z 5-11l 1.11l 3.7/32 2152.21/32 Z.5/I 3-15/32 2.5/1& 2392.3/4 3-5/1 2.5/1 2.5/1 2452.11l 4-11l 2 2.21/32 2531.15/1& 5-11l 2.1/1& 3.7/32 2732.21/32 1 5/1 3.15/32 2.5/1& 3052.3/4 3-5/1 2.5/1 2.5/1 3112.1/2 4-11l 2 2-29/32 3201.15/1& 5-11l 2.1/1& 3-7/32 3394-3/8 1-1/8 4-3/4 1-15/32 613-31/32 2-5/8 4-13/32 2-5/16 613-13/16 3-5/8 3-8/16 2-5/8 133-19/32 4-1/2 2-29/32 2-29/32 834-3/8 1-1/8 4-3/4 1-15/32 103-31/32 2-5/8 4-13/32 2-5/16 163-13/16 3-5/8 3-8/16 2-5/8 833-19/32 4-1/2 2-29/32 2-29/32 924-11/32 1-1/8 4-25/32 1-15/32 853-15/16 2-5/8 4-1/16 2-5/16 913-25/32 3-5/8 3-19/32 2-5/8 913-t/16 4-1/2 2-15/1& 2-29/32 1013-15/16 2-5/8 4-1/16 2-5/16 1293-25/32 3-5/8 3-11/32 2-5/8 1353-1/2 4-1/2 3 2-29/32 1423 5-1/2 2-1/2 3-1/32 1783-29/32 2-5/8 4-15/32 2-5/16 1913-3/4 3-5/8 3-5/8 2-5/8 2033-1/2 4-1/2 3 2-29/32 2123 5-1/2 2-1/2 3-1/32 2313-29/32 2-5/8 4-15/32 2-5/16 2593-3/4 3-5/8 3-5/8 2-5/8 2643-1/2 4-1/2 3 2-29/32 2132-15/16 5-1/2 3-1/16 3-1/32 2933-29/32 2-5/8 4-15/32 2-5/16 3283-3/4 3-5/8 3-5/8 2-5/8 3343-1/2 4-1/2 3 '2-29/32 3432-15/16 5-1/2 3-1/16 3-1/32 36241"13"FACE 15" FACEA , ., C IDIAlii::IHUBCHKCHECHFCHJCHKCHECHFCHJCHKCHECHFCHJCHECHFCHJCHMCHECHFCHJCHMCHECHFCHJCHMCHECHFCHJCHMD 'WI" I5-3/8 1-1/8 5-3/4 1-15/3 194-31/32 2-5/8 5-13/32 2-5/16 854-13/16 3-5/8 4-1/16 2-5/8 914-19/32 4-1/2 3-21/32 2-21/32 1015-3/8 1-1/8 5-3/4 1-15/32 914-31/32 2-5/8 5-13/32 2-5/16 914-13/16 3-5/8 4-1/16 2-5/8 1034-19/32 4-1/2 3-21/32 2-29/32 1135-11/32 1-1/8 5-25/32 1-15/32 1084-15/16 2-5/1 5-1/16 2-5/16 1144-25/32 3-5/8 4-11/32 2-5/1 1204-1/16 4-1/2 3-15/16 2-21/32 1294-15/16 2-5/1 5-1/16 2-5/16 1424-25/32 3-5/1 4-18/32 2-5/8 1484-1/2 4-1/2 4 2-21/32 1584 5-1/2 3-1/2 3-1/32 2014-29/32 Z-5/I 5-15/32 2-5/16 2344-3/4 3-5/1 4-5/1 2-5/8 2404-1/2 4-1/2 4 2-29/32 2494 5-1/2 3-1/2 3-1/32 2684-21/32 2-5/1 5-15/32 2-5/16 3034-3/4 3-5/1 4-5/1 2-5/8 3014-1/2 4-1/2 4 2-21/32 3183-15/16 5-1/2 4-1/16 3-1/32 3314-29/32 2-5/8 5-15/32 2-5/16 3804-3/4 3-5/8 4-5/1 2-5/8 3864-1/2 4-1/2 4 2-29/32 3953-15/16 5-1/2 4-1/16 3-1/32 4146-3/B 1-7/B 6-3/4 1-15/32 BB5-31/32 2-5/B 6-13/32 2-5/16 935-13/16 3-5/8 5-1/16 2-5/8 1005-19/32 4-1/2 4-21/32 2-21/32 1096-3/B 1-7/8 6-3/4 1-15/32 1005-31/32 2-5/B 6-13/32 2-5/16 1065-13/16 3-5/8 5-1/16 2-5/8 1135-19/32 4-1/2 4-29/32 2-29/32 1226-11/32 1-7/8 6-25/32 1-15/32 1195-15/32 2-5/8 6-7/16 2-5/11 1255-25/32 3-5/8 5-11/32 2-5/B 1315-9/16 4-1/2 4-15/16 2-21/32 1405-15/16 2-5/1 6-7/16 2-5/11 1565-25/32 3-5/1 5-11/32 2-5/8 1625-1/2 4-1/2 5 2-21/32 1715 5-1/2 4-1/2 3-7/32 2235-21/32 2.5/1 6-15/32 2-5/16 2545-3/4 3-5/1 5-5/1 2-5/1 2595-1/2 4-1/2 5 2-21/32 26B5 5-1/2 4-1/2 3-7/32 2BB5-21/32 2-5/1 6-15/32 2-5/16 3275-3/4 3-5/1 5-5/1 2-5/8 3335-1/2 4-1/2 5 2-21/32 3414-15/16 5-1/2 5-1/16 3-7/32 3615-29/32 2-5/1 6-15/32 2-5/16 40B5-3/4 3-5/B 5.5/B 2-5/1 4145-1/2 4-1/2 5 2-29/32 4224-15/16 5-1/2 5-1/16 3-7/32 442&-7/1 1.7/1 7.1/4 1.15/32 92&-15132 2.5/1 6.29/32 2.5/16 98&-5/16 3.5/1 &-1116 2.5/1 104&-3132 4-1/2 5-13/32 2.21/32 1146.718 1.7/8 7-1/4 1.15/32 105&-15132 2-5/8 &-21/32 2-5/16 1116.5/16 3-518 6-1/16 2.5/1 III6-;;/32 4-1/2 513/32 2-21/32 1276.27/32 17/8 79/32 1.15/32 1246.7116 2-5/1 6-15/16 2.5/16 130&-9132 3-5/1 6.3/32 2.5/1 1366-1/16 1 4-1/2 5-7/16 2.29/32 1466-7116 2.5/1 6-15/16 2.5/16 163&-9132 3-5/1 6-3/32 2-5/1 1816 4.112 5.1/2 2-29/32 1785.1/2 5.1/2 5 3.'7/32 2316-13/321 2-5/1 6.31/32 I 25/16 2646.1/4 3-5/8 6118 2.5/1 2696 4-1/2 5.1/2 2-29/32 2785.1/2 5-112 5 3.7/32 298&-13/32 1 2-5/1 &-31/321 2.5/16 3396.1/4 3-5/1 6-1/8 2.5/1 3446 41/2 5.1/2 2-29/32 3535.7/161 5112 5.9/16 3-7/32 3736-13/32 2518 631/32 2-5/16 4226-1/4 3.5/1 &-1/1 2.5/1 4276 4.1/2 5.1/2 2.29/32 4365.7/16 I 5-1/2 5.9/16 I 3.7/32 45618'120'124"130"136'42"OTHERCONTINENTALPRODUCTS.Screw conveyors.Conveyor pulleys.Conveyor idlers.Vibrating feeders.Bucket elevators.Engineered systems.Chain conveyors(En masse)CONTINENTAL CONVEYOR & MACHINE WORKS L TO.470 St-Alphonse Steet EastThetford Mines, QuebecCanada G6G 3V8Tel. (418) 338-4682Fax (418) 338-4751CONTINENTAL CONVEYOR (ONTARIO) LTD.100 Richmond Blvd.Napanee, OntarioCanada K7R 383Tel. (613) 354-3318Fax (613) 354-5789