RBC Installation Manual
Contents
1. Engineering Services 8 Supplies Pty Ltd ES CJ Phone 1 800 074446 Visit our Web Site The ESS Brush Cleaner SAFE WORKING PROCEDURES SWP INSTALLATION MANUAL 88 MARTIN ENGINEERING Revision Description of Change Changed By Date A Added Final Checklist AS 28 5 07 B Bearing information updated on drg F0258 GC 19 10 07 Added Warranty Reg amp Hazards List AS C Added IP rating information on drg F0172 and F0258 CW 23 01 09 D Updated Melbourne Address amp Removed SA Address SH 3 08 09 E Final Checklist Updated Items 4 amp 5 Reversed SH 15 04 10 Revision E 1 15 04 10 ENGINEERING SERVICES and SUPPLIES ESS HEAD OFFICE ESS MACKAY ESS PERTH ESS MAITLAND ESS WOLLONGONG ESS MELBOURNE ESS EMERALD ESS GLADSTONE ESS ADELAIDE ESS KALGOORLIE ESS MOUNT ISA Revision E OFFICE DETAILS 11 13 TRADERS WAY PO BOX 121 CURRUMBIN QLD 4223 1 PROGRESS STREET PO BOX 5755 MACKAY MC QLD 4740 19 CLAVERING ROAD BAYSWATER WA 6053 UNIT 2 BARTON COURT 6 JOHNSON STREET MAITLAND NSW 2320 1 20 DOYLE AVENUE PO BOX 343 UNANDERRA NSW 2526 4 314 Governor Road BRAESIDE VIC 3195 11 115 ROBERTS STREET EMERALD QLD 4720 2 34 CHAPPLE STREET PO BOX 1475 GLADSTONE QLD 4680 4 235 HAY STREET PO BOX 10471 KALGOORLIE WA 6430 6 TRADERS WAY PO BOX 1554 MTISA QLD 4825 P 07 5589 2000 F 07 5598 1353 P 07 4952 4600 F 07 4952 4717 P 08 9370 31552. F 08 9272 5130 02 4932 3544 F 02 4932 3611 P 02 4272 4422 F 02 4272 4434 P 03 9580 0388 F 03 9587 5199 P 07 4982 4855 F 07 4987 5118 P 07 4972 3759 F 07 4972 2866 P 08 8262 8955 F 08 8262 4944 P 08 9021 7991 F 08 9021 7291 P 07 4749 4580 F 07 4749 3019 CUSTOMER SERVICE NUMBER 1800 074446 TOLL FREE FROM ANYWHERE IN AUSTRALIA 15 04 10 WARRANTY NOTE ESS WARRANTS the ESS Product to be free of defects both in materials and workmanship for a period of 12 months from the date of despatch of the product from the ESS factory The warranty given by ESS in this regard will extend only to replacing or repairing product shown to be defective The warranty also is subject to the following restrictions a Installation of the product contrary to the instructions contained in the supplied manual will void such warranty absolutely b warranty will not extend to any liability for injuries incurred and which result from the use of the product contrary to the instructions in the manual c Save as prescribed by law ESS will not be liable for any damage sustained by a purchaser or a third party by way of consequential loss arising out of defects in the product You are asked to note that ESS offers purchasers a service whereby either a t will install the product and certify the correctness of such installation or b Certify the correctness or otherwise of the in
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4. place on the drive side Loosen the locknuts on the adjusting screws at the lower end of each support bracket Turn the adjusting screw equally on both sides until the brush bristles are just touching the belt The drive and torque arm assembly will automatically be adjusted via the anchor bracket Ensure that the bristle contact is equal across the belt that is the bristles are just touching across the belt width Continue turning the adjusting screw equally on both sides approximately 3 mm or two turns Do not over adjust the cleaning is done by the tips of the bristles and excessive adjustment will result in poor performance and high wear Re tighten the bolts securing the bearing housings to the mounts and tighten the locknuts on the adjusting screws Start the conveyor and the ESS Brush Cleaner and observe the cleaning action of the brush Ensure that the brush rotates smoothly against the belt with no vibration Observe the belt surface after the ESS Brush Cleaner is the brush cleaning the full belt area If the belt surface is excessively worn and the brush does not make full contact allow a period of time say 1 week for the brush to wear to the belt profile and then adjust two more turns of the screw Revision E 15 15 04 10 SECTION 7 ROUTINE MAINTENANCE AND SERVICE Regular inspection and servicing is the key to effective conveyor belt cleaning t is recommended that the cleaner be inspected once per week ini
5. shown below ia CONVEYOR ISOLATOR E STOP CONVEYOR als START CONVEYOR TOL CONVEYOR elle 415V AUTO OFF O O MANUAL ON BRUSH ISOLATOR L15V 2 BRUSH MOTOR CONVEYO MOTOR Revision E 15 04 10 SECTION 6 COMMISSIONING 6 1 Description Once the ESS Brush Cleaner has been electrically connected and tested it can be adjusted for service The ESS Brush Cleaner utilises jacking screws to adjust the brush to the belt 6 2 B S FARING HOUSINGS ADJUSTING SCREW LOCKNUT ADJUSTING SCREW Adjustment Procedure Slightly loosen the bolts securing the bearing housings to the mounts to just allow the housing to slide Repeat for both sides Ensure that the Torque Arm bracket remains in
6. the head pulley so that material brushed from the belt is delivered into the conveyor chute The ESS Brush Cleaner rotates against the direction of belt travel at a speed of approximately 280 rpm The ESS Brush Cleaner is often used as a secondary cleaner and is preceded by a primary cleaner such as the ESS Trac mount Durt Tracker or XHD primary cleaners The ESS Brush Cleaner has 100 mm wide segments so that the same spare part can be used for all belt widths The brush is available with a range of bristle materials and thickness Revision E 6 15 04 10 SECTION 3 PREPARATION FOR INSTALLATION 1 CHECK INSTALLATION DRAWINGS Ensure that you have the correct drawings and equipment for your conveyor s PRE ASSEMBLE THE CLEANER S AND MOUNTS Do this in your workshop or similar free area rather than at the Conveyor This will enable you to verify all required equipment is present familiarise yourself with the cleaner assembly allow you to plan the installation reducing installation time ASSEMBLE THE NECESSARY TOOLS amp SAFETY EQUIPMENT REQUIRED FOR THE INSTALLATION OBSERVE THE CONVEYOR WHILE RUNNING AND CONVEYING MATERIAL Observe the belt splice condition Does the belt run true or track off to one side Is the Head Pulley out of round Consult ESS if any UNUSUAL conditions are observed in the above These conditions may result in recommendation of a different i
7. the model the torque arm anchor will be length of threaded rod or later a folded steel bracket For the rod model ensure that a nut and washer are fitted each side of the torque arm Adjust the inner nut until the washer is contacting the torque arm Adjust the outer nut until the washer contacts the torque arm and then use spanners to tighten both nuts For the steel bracket model fit the smaller bracket to the slots in the larger bracket using fasteners supplied Ensure that the smaller bracket is on the inside or away from the drive unit and that the hole in the small bracket aligns with the hole in the torque arm Attach the smaller bracket to the torque arm using the single bolt supplied and tighten securely Tighten the bolts securing the smaller bracket to the larger bracket Revision E 11 15 04 10 Step 9 If required for containment of dust or to comply with plant safety rules a cover may be fabricated and fitted to the chute opening especially on the non drive side The cover must be easily removable for inspection of the brush and must allow for vertical adjustment of the brush shaft A typical cover is shown below er OPENING TO MATCH ih OF BELT DRIVE SIDE CUTOUT FIX COVER CHUTE WALL BRUSH eaer OUTLINE OF COVER MOUNT OUTLINE OF CHUTE CUTOUT SUGGESTED COVER FOR NON DRIVE SIDE The E
8. 0084483 1 3 599 7 WIL WHY 300801 JAYO WHOM OIL VM 1 5 05 AYWN 2 YOLOW 039 13 Hd 31104 7 MAS O 001 057 LINN JAYO QIHVAHOLOW 15 04 10 20 Revision FINAL CHECKLIST Site Number Date Site Equipment No Location Site Contact Completed By Circle Yes or No Below Was equipment to ESS Specification Yes No Drawing No Ref Attached Yes No If No WHY Will this affect performance Yes No If Yes WHY Was this a standard O service LI inspection LI installation Yes No If No WHY Was work carried out as per procedure and JSA Yes No If No WHY Is equipment fit for commissioning Yes No If No WHY Was a final inspection carried out while plant was running Yes No If No WHY Has anything changed from previous service inspection installation Yes No If Yes WHAT Is equipment performance to Client expectations Yes No If No WHY ESS Signature Client Signature Revision E 21 15 04 10 ESS ENGINEERING SERVICES amp SUPPLIES PTY LTD WARRANTY REGISTRATION FORM Installer Purchaser to fill out form amp fax or scan email to ESS Engineering Services amp Supplies Pty Ltd Fax 1800 824 446 Email warranty Qesseng com au So e Se ts RR SERERE NER REPE GS OAC PRENNE RETRO dienes NOTE This Equipment is guaranteed to be free of defects in material and manufacture for a period
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10. SS Brush Cleaner is now installed and ready for electrical connection Revision E 12 15 04 10 SECTION 5 ELECTRICAL CONNECTION AND CONTROL CAUTION The ESS Brush Cleaner is a motorised brush with the motive power supplied by a 3 phase electric motor The drive motor must be connected in accordance with all site and statutory regulations and only by a licensed and appropriately trained electrical tradesperson Ensure that all power sources are isolated when working on or connecting exposed electrical cabling 5 1 Control The ESS Brush Cleaner should rotate against the direction of the conveyor see figure below The ESS Brush Cleaner should be interlocked with the conveyor drive so that it operates only when the conveyor operates A safety isolation switch should be located adjacent to the Brush Cleaner drive unit A conveyor emergency stop or pull wire should be located adjacent to the Brush Cleaner on both sides of the conveyor Stopping the conveyor should automatically stop the ESS Brush Cleaner sam BELT DIRECTION ROTATION Additionally the ESS Brush Cleaner may be connected with a selector switch that allows automatic starting of the cleaner whenever the conveyor starts but also allows manual starting and stopping of the cleaner for maintenance and adjustment without the conveyor running Revision E 13 15 04 10 A typical control circuit is
11. ce work will be most frequently performed at the Non Drive side so this side should have the best access Ensure there is sufficient room for the drive unit on the side nominated as the Drive side UNDERSIDE CENTRE L i UNDERSIDE OF BELT BRU OF BELT CENTRE LINE a OF BRUSH 518 HOLES HOLES 200 NON DRIVE SIDE VE SIDE Note The cleaner mounts can be either side leading or trailing of the brush but must be the same both sides Step 3 Fit the bearing units to the Brush Cleaner mounts using the bolts supplied Ensure that the grub screws on the bearing hub are outward from the mounts and that the bearing units are at the adjusting screw end of the slots in the mounts Fit the Drive side mount and bearing assembly to the chute using the bolts supplied Ensure that the correct side mount is used and that the adjusting screw is at the bottom Revision E 10 15 04 10 Step 4 Assemble the brush segments to the cleaner mainframe and fit the lock each side Centre the segments on the square tube and securely fasten the Drive side lock only Remove the Non Drive side lock and the brush segments Insert the shaft and lock stepped end first into the Non Drive side cut out through the Drive side cut out and through the bearing on the Drive side mount Ensure that the stepped end of the shaft is on the Drive side Step 5 Supporting the shaft fit the brush segments
12. e mounts Fit the torque arm anchor bracket to the drive side mount positioning it on the opposite side of the mount bracket to the bearing housing and sharing the bearing housing fasteners With the bolts in the bottom of the slots the top of the brush should be approximately 10 mm clear of the underside of the belt Lightly tighten the bolts securing the bearing housings Centre the brush segments to the belt by sliding the mainframe through the bearings Tighten the grub screws securing the bearings to the shaft Step 7 Fit the geared motor drive unit over the stepped end of the mainframe shaft Ensure that the key is in place and aligned with the keyway before applying necessary force to fit the drive unit Ensure that the torque arm is in place and aligned with the anchor bracket for the required motor orientation The drive can be rotated to several positions but the torque arm must be first repositioned so that it aligns with the anchor bracket Step 8 Depending on the model the torque arm anchor will be a length of threaded rod or later a folded steel bracket For the rod model ensure that a nut and washer are fitted each side of the torque arm Adjust the inner nut until the washer is contacting the torque arm Adjust the outer nut until the washer contacts the torque arm and then use spanners to tighten both nuts against the torque arm For the steel bracket model fit the smaller bracket to the slots in the larger bracket u
13. f incorrect have an electrical tradesperson change the drive direction Remove brush segments and clean Contact ESS for alternative brush materials Primary Cleaner not functioning Service the Primary Cleaner correctl Incorrect Brush Material Contact ESS for alternative materials Cleaner overloaded Add additional cleaner Cleaner not suitable for product Brush Cleaners work best on dry powders and stringy dry materials Excessively wet or sticky materials may cause blinding of the brush and subsequent poor performance Contact ESS Revision E 18 15 04 10 SECTION 9 INSTALLATION ARRANGEMENT DRAWING 011 11 15 1 83 311 553 LAGING O82 2n03H 1104 2 HOLOW MASI 1138 QO8L OSEL 112110 082 NOILINGIY 1 5 5991 1194 7 HOLOW 0 1138 0025 054 L3NJVHA 3LVIHAOHdAV HO 71 31 2 01 SINNOW 2 11 J i 35 001 X 51834215 HSNHA 30 ON J WIG EH SRE 2 IET TIT ee DT C __ H 4 S CL c t GENE ORO mi u I H 822 4 E ET __ __ 100 057 Wid 5109 90052 ozz 0011 osa 091 oos 5060900 2 ona 056 iw nis rsosisoosz ossi 099 0441 15150090052 ogei 0 008 ob 51118 0991 956 21 Sue 0 58 gy USJGW 3104 34 en oon wa osn 30 05 68190052 096 som orsi
14. haft Unbolt non drive side mount and bearing assembly and bracket for the open conveyor installation and remove the complete assembly from the cleaner shaft taking care to support the end of the shaft Reach in and remove the non drive side blade lock sliding it from the shaft Slide the brush segments individually from the shaft Worn brush segments should easily fit through the access cut out Clean any material build up from the shaft Fit new brush segments by sliding them onto the cleaner shaft The bristles of the new segments will easily bend to fit through the access cut out Ensure the new segments are in contact with the drive side lock and each other then refit the non drive side lock Refit the non drive side bearing and mount and bracket assembly and tighten the grub screws securing the bearing to the shaft Adjust the brush to the belt as described in section 6 2 Refit the non drive side access Cover Return the ESS Brush Cleaner and the conveyor to service 17 15 04 10 SECTION 8 TROUBLE SHOOTING PROBLEM High brush wear rate CAUSE SOLUTION Cleaner over tensioned Re tension the cleaner as described in section 6 2 Incorrect brush material Contact ESS for re appraisal PROBLEM Insufficient cleaning too much carryback CAUSE SOLUTION Cleaner under tensioned Re tension cleaner as per section 6 2 Cleaner not rotating in the correct The cleaner must rotate against the belt travel direction I
15. line which represents the centre line of the mount bracket holes The mount bracket can be either side of the brush in other words the mount brackets can be on the leading or trailing side of the brush but must be the same on both sides of the conveyor Step 3 Fabricate suitable brackets to attach the Brush Cleaner mounts to the conveyor stringers The upper holes of the Brush Cleaner mounts should be 60 mm below the underside of the conveyor belt See figure below The non drive side brackets must be easily removable bolted for future brush segment replacement 9 plus j CENTRE LINE OF BRUSH UNDERSIDE OF BELT BRACKETS FOR urs An NOT INCLUDEDI BRUSH CLEANER MOUNT Revision E 8 15 04 10 Step 4 Attach the Brush Cleaner mounts to the fabricated brackets as shown Ensure that the mounts are perpendicular to the conveyor belt and that the adjusting screw is at the bottom of the mounts Tighten the M16 bolts securing the mounts to the brackets Step 5 Assemble the brush segments to the cleaner mainframe and fit the lock each side Centre the segments on the square tube and secure the locks Fit the bearing assemblies to each end of the mainframe with the securing grub screws outwards Do not tighten the grub screws at this point Step 6 Lift the mainframe and brush assembly into place and attach to the mounts by bolting the bearing housings to the slots in th
16. nstallation position or even a different cleaner SECTION 4 INSTALLATION DANGER Conveyor must be shut down and locked out before installation is performed WARNING If installation is to be done in an enclosed area test atmosphere for gas level or dust content Follow all welding and safety guidelines Protect belt surface from weld spatter with appropriate shield NOTE For installation on enclosed head pulley chute work draw all dimension lines on chute wall In applications where head pulley is not enclosed use the best available field resources and or methods to ensure that these critical dimensions are followed for a proper installation Revision E 7 15 04 10 4 1 Installation on Open Framed Conveyors Where the ESS Brush Cleaner is to be installed on an open framed conveyor or in an area away from the chute enclosure the following installation steps should be followed Step 1 Determine the installation position for the ESS Brush Cleaner This should be ona flat area of the return belt and preferably in a position where the material removed from the belt will be captured and delivered onto the next conveyor receiving hopper or the like Mark the vertical centre line of the brush on the conveyor stringers or structure Note For conveyors that are inclined the brush centre line is not vertical but will be perpendicular to the belt line Step 2 Measure 94 mm one side of the brush centre line and mark another
17. of 12 months from the date of purchase delivery If the ESS product is found to be faulty or if any problems are encountered with the equipment contact ESS on 1800 074 446 Revision E 22 15 04 10
18. onto the Non Drive end of the shaft and push them through the chute cut out the brush bristles will distort to fit through the smaller opening Fit all of the segments ensuring that the furthest segment is in contact with the Drive side lock Fit the Non Drive side lock and secure Fit the Non Drive side mount and bearing assembly to the shaft and attach to the chute using the bolts supplied With the bearing housings positioned in the bottom of the slots in the mounts the brush bristles should be approximately 10mm clear of the underside of the belt Step 6 Remove the nuts securing the Drive side bearing housing and fit the torque arm anchor bracket to the drive side mount positioning it on the opposite side of the mount bracket to the bearing housing and sharing the bearing housing fasteners Re fit the nuts and lightly secure Centre the brush segments to the belt by sliding the mainframe through the bearings Tighten the grub screws securing the bearings to the shaft Step 7 Fit the geared motor drive unit over the stepped end of the mainframe shaft Ensure that the key is in place and aligned with the keyway before applying necessary force to fit the drive unit Ensure that the torque arm is in place and aligned with the anchor bracket for the required motor orientation The drive can be rotated to several positions but the torque arm must be first repositioned so that it aligns with the anchor bracket Step 8 Depending on
19. sing fasteners supplied Ensure that the smaller bracket is on the inside or away from the drive unit and that the hole in the small bracket aligns with the hole in the torque arm Attach the smaller bracket to the torque arm using the single bolt supplied and tighten securely Tighten the bolts securing the smaller bracket to the larger bracket The ESS Brush Cleaner is now installed and ready for electrical connection Revision E 9 15 04 10 4 2 Installation on Enclosed Conveyor Chutes Where the ESS Brush Cleaner is to be installed on an enclosed conveyor chute the following installation steps should be followed Step 1 Determine the installation position for the ESS Brush Cleaner This should be ona flat area of the return belt and preferably in a position where the material removed from the belt will be captured and delivered onto the next conveyor receiving hopper or the like Determine by measuring the position of the conveyor belt and mark this on the outside of the conveyor chute enclosure Mark the vertical centre line of the brush on the conveyor chute enclosure Repeat both sides of conveyor Note For conveyors that are inclined the brush centre line is not vertical but will be perpendicular to the belt line Step 2 Using the marked centre lines and belt line and the figure below mark out the chute cut outs Ensure that the correct cut out is marked for the Drive and Non Drive sides of the cleaner Future maintenan
20. sioning Section 6 2 Begin the re adjustment by first reversing the adjustment procedure and backing the brush away from the belt by a few millimetres inspect the bristles and then follow the adjustment procedure Revision E 16 15 04 10 7 2 Brush Replacement Do not attempt service on this cleaner with the belt or the cleaner running Do not reach into the conveyor enclosure with the belt or cleaner running Shut down lock out and tag the conveyor and the ESS Brush Cleaner before attempting any maintenance that requires reaching into the conveyor enclosure Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Revision E Shut down and lock out the conveyor and the ESS Brush Cleaner as per site safety rules To access the brush segments first fully de adjust the cleaner by reversing the adjustment procedure as described section 6 2 When adjusting or de adjusting the cleaners ensure that this is done evenly on both sides Alternate sides at each turn of the adjusting rod or use an assistant If the Brush Cleaner is on an enclosed conveyor chute remove the non drive side cover if fitted Visually inspect the brush segments and bristles If bristles are clean and not excessively worn re tension the cleaner and return to service If bristles are excessively worn or damaged proceed When fully retracted loosen the grub screws securing the non drive side bearing to the s
21. stallation of the product by third parties This certification service is designed to ensure that you obtain the full benefit of the ESS warranty hereby provided If you would like to take advantage of the installation certification service provided please contact ESS regarding the service THE CONTENTS OF THIS MANUAL ARE COPYRIGHT TO ESS ENGINEERING SERVICES AND SUPPLIES PTY LTD ALL RIGHTS RESERVED Information contained herein is for use in the operation of the ESS Brush Cleaner Conveyor Belt Cleaner purchased from ESS and cannot be passed on to any other party without express permission in writing from ESS Revision E 3 15 04 10 INDEX SECTION 1 SECTION 2 SECTION 3 SECTION 4 SECTION 5 SECTION 6 SECTION 7 SECTION 8 SECTION 9 SECTION 10 Revision E SAFETY INTRODUCTION PREPARATION FOR INSTALLATION INSTALLATION ELECTRICAL CONNECTION AND CONTROL COMMISSIONING ROUTINE MAINTENANCE AND SERVICE TROUBLE SHOOTING INSTALLATION ARRANGEMENT DRAWING EXPLODED PARTS LIST 15 04 10 SECTION 1 SAFETY The ESS Brush Cleaner Conveyor Cleaner is designed to be quickly and easily serviced by appropriate personnel Under no circumstances should servicing or installation of the cleaner be carried out whilst the belt is in operation Under no circumstances should servicing or maintenance of the cleaner be carried out whilst the Brush Cleaner is in operation The conveyor must be shut down and locked o
22. tially Actual service intervals will vary considerably from plant to plant CAUTION DO NOT REACH INSIDE THE CONVEYOR CHUTE UNDER ANY CIRCUMSTANCES WHILST THE CONVEYOR IS RUNNING BEFORE ATTEMPTING ANY MAINTENANCE OR SERVICE WORK ON THE ESS BRUSH CLEANER SHUT DOWN AND LOCKOUT BOTH THE CONVEYOR AND THE ESS BRUSH CLEANER 7 1 Routine Inspection The following tasks should be undertaken during a routine inspection Observe the conveyor belt after the ESS Brush Cleaner Is the belt being cleaned uniformly If the conveyor shows streaking or uneven cleaning it may indicate that adjustment or brush segment replacement is required Inspect the ESS Brush Cleaner drive unit Ensure that the shaft is rotating smoothly Check for noise or vibration Check that all fasteners are secure Check bearings and lubricate if necessary f fitted and if allowable under site regulations remove the non drive side cover plate and visually check the condition of the brush segments and bristles Ensure that the bristle tips are making good contact with the belt f any problems are identified with the ESS Brush Cleaner operation adjustment or the condition of the bristles arrange for the conveyor to be shutdown and service the cleaner as described below 7 2 Re adjustment Procedure Once the brush bristles wear readjustment of the cleaner will be necessary To readjust the cleaner refer to the adjustment procedure in the Commis
23. ut before any person enters or reaches into the conveyor enclosure The ESS Brush Cleaner must be shut down and locked out before attempting any maintenance or adjustment Ensure that only suitably qualified and trained personnel install and service this product Ensure that all site and statutory safety procedures are followed Electrical connections to the ESS Brush Cleaner must be carried out by a suitably qualified and licensed electrical tradesperson and must comply with all appropriate Australian and site electrical and safety standards Hazards that may be present when installing this equipment Hazard Hazard Moving Conveyor ISOLATE Other Hot Work Other Working at Heights Other Heavy Lift Other Persons Working Overhead Other Persons Working Below Other Electrical amp Cabling Other Pinch Points Other Trip Hazards Once hazards have been identified the installer should undertake and document a comprehensive Job Hazard Analysis according to site requirements and good safe working practice The installer must identify all hazards and apply appropriate controls before proceeding with the installation of this equipment Revision E 5 15 04 10 SECTION 2 INTRODUCTION The ESS Brush Cleaner is a motorized rotary brush designed for use as a cleaning device for conveyor belts It is normally located on the return side of the conveyor belt as close as possible to
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