Milltronics MWL User manual

MWL
MilltronicsWeight Lifter
Instruction Manual June 2001
MILLTRONICSWEIGHT LIFTER

© Siemens Milltronics Process Instruments Inc. 2001
Safety Guidelines
Warning notices must be observed to ensure personal safety as well as that of others, and to
protect the product and the connected equipment. These warning notices are accompanied
by a clarification of the level of caution to be observed.
Qualified Personnel
This device/system may only be set up and operated in conjunction with this manual.
Qualified personnel are only authorized to install and operate this equipment in accordance
with established safety practices and standards.
Warning: This product can only function properly and safely if it is correctly transported,
stored, installed, set up, operated, and maintained.
Note: Always use product in accordance with specifications.
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not be responsible for the contents of partial or
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versions.
While we have verified the contents of
this manual for agreement with the
instrumentation described, variations
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Technical data subject to change.
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7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 1
Table of Contents
Milltronics Weight Lifter (MWL): Introduction ..............................................................2
Applications .............................................................................................................................................. 2
MWL Components ..................................................................................................................................3
Calibration Weight Arrangement ..............................................................................................4
Specifications ......................................................................................................................5
Belt Width .....................................................................................................................................5
Idler Spacing ................................................................................................................................5
Calibration Weight Capacity .....................................................................................................5
Crank Arm .....................................................................................................................................5
Calibration Weight Dimensions ..............................................................................................5
Mounting Dimensions ................................................................................................................5
Approvals ......................................................................................................................................5
Installation........................................................................................................................... 6
Drill left and right crank body mounting holes .....................................................................6
Mount left-handed and right-handed crank body ...............................................................7
Mount torque shaft / Check clearance for conveyor belt .................................................8
Install crank handle ....................................................................................................................9
Test the unloaded MWL / Align crank bodies ...................................................................10
Install calibration weights / Check for clearance .............................................................11
Test the loaded MWL ...............................................................................................................14
Shim the MWL (if required) / Recheck base-bar weight for clearance ......................15
Operation ............................................................................................................................17
Applying calibration weights ..................................................................................................17
Storing calibration weights .....................................................................................................17
Storing crank handle ................................................................................................................17
Maintenance Procedures ................................................................................................19
Removing material accumulation ...........................................................................................19
Greasing......................................................................................................................................... 19
Appendix I: Installation Drawings .................................................................................20
MWL Installation Drawing for the MUS-STD Standard Duty Belt Scale ................................20
MWL Installation Drawing for the MUS-HD Heavy Duty Belt Scale .......................................21
Retrofitting an MUS-HD Heavy Duty Belt Scale: ...............................................................22
MWL Installation Drawing for the MSI or MMI Belt Scale ........................................................23
Retrofitting an MSI or MMI Belt Scale: ...............................................................................23
Appendix II: Customer Calculation Sheet .................................................................... 27
Calculation of Total Calibration Weight Mass ...................................................................27
Calculation of Load Reference Values .................................................................................27
Using the Factoring Function of the Belt Scale Integrator .............................................28
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Page 2 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01
Milltronics Weight Lifter (MWL):
Introduction
The Milltronics Weight Lifter (MWL) mechanically raises and lowers the static
calibration weights used to calibrate Milltronics belt scales. It stores the weights
securely between the belt strands, above the calibration-weight support arms, and
allows the operator to lower and apply the weights safely without having to lean into the
conveyor.
The MWL is manually operated, and utilizes a high mechanical advantage to enable
weights up to 225 Kg (500 lb) to be applied with very limited effort. The crank handle can
be attached to either the left or right crank body. It uses 4 revolutions for full range of
motion, and can be removed and stored for safety on the locking ball-pin which secures
the MWL when it is not in use.
Two lifting pads support a base-bar weight above the calibration-weight supports of the
belt scale: either flat bar or horseshoe style calibration weights are available. Locating
notches in the base-bar weight engage the calibration weights securely on the lifting pads
in the stored position, and the worm gear drive locks the lifting pads in place. A manually-
applied locking-pin secures the MWL when the calibration-weights are in the stored
position.
Applications
The MWL is designed to work with the following Milltronics belt scales:
• MUS-STD MIlltronics Standard Universal Scale
• MUS-HD Milltronics Heavy-Duty Universal Scale
• MSI Milltronics Single Idler Scale
• MMI Milltronics Multiple Idler Scale (combination of 2 MSI Scales)
Belt Scale Manuals can be downloaded from the Milltronics website at:
www.Milltronics.com
Note: Please follow the installation and operating procedures to ensure a quick,
trouble-free installation, and to allow for the maximum accuracy and reliability of your
Milltronics Weighing System.
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7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 3
MWL Components
• a left-handed and right-handed crank body, each connected to a lifting-pad with guide-pin
• torque tube, to connect the left and right crank shafts
• crank handle, to be mounted to either the left or right input shaft
• optional shaft extension; adds 102mm (4") to handle shaft length
• base-bar weight (either flat bar or horshoe style) to support other supplied calibration
weights
• U-clamp to secure flat bar calibration weights
Base-bar Weight
Torqu e Tube
Crank
Handle
Shaft Extension
(optional)
Right-handed
Crank Body
Guide-pin (2)
Lifting-pad (2)
Connecting Shaft (2)
Input Shaft (2) Left-handed Crank Body
Input Shaft
Guide-pin
Removable
Crank Handle
Lifting-pad (lifts
as it rotates)
Worm Gear
Output Shaft
Drive Plate
Torque Tube
Plate Guide
Travel Stop
Travel Stop
Connecting Shaft
Cut-away view of Gear Drive
(Left-hand, clockwise-rotating crank-body shown)
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Page 4 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01
Calibration Weight Arrangement
offset
The horseshoe weights are not symmetrical:
an offset channel locates them on the base-bar weight.
Rotate alternate weights through 180o so that the weights
are staggered, to stabilize the base-bar weight.
Horseshoe Style Calibration Weights
Horseshoe-style
Base-bar Weight
Horseshoe-style Calibration Weights
Flat Bar Base-bar Weight
Flat Bar Calibration Weights
U-bracket
(supplied with
MWL)
Flat Bar Style Calibration Weights
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7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 5
Specifications
Belt Width
• MUS-STD Standard Duty: up to 1000mm; CEMA width 42"
• MUS-HD Heavy Duty: 1200mm and up; CEMA width 48" : can also be applied to
narrower conveyors
• MSI Single Idler: 500 to 2000mm; CEMA width 18" to 84" (prepared for use
with MWL)
• MMI Dual Idler: consists of 2 MSI scales, 2 MWL units are required
Idler Spacing
• Minimum of 610mm (24")
Calibration Weight Capacity
• MUS-STD: up to 175 lb (80 kg)
• MUS-HD: up to 350 lb (160 kg)
• MSI singly, (or MMI system): up to 500 lb (225 kg)
Crank Arm
• Mechanical Advantage: 20:1
• Number of Revolutions required for raising or lowering: 4
Calibration Weight Dimensions
Mounting Dimensions
• See detail installation drawings on page 20, page 21, and page 23, for MUS-STD
Standard Duty, MUS-HD Heavy Duty, and MSI Single Idler belt scales.
Approvals
• The MWL Milltronics Weight Lifter is in compliance with Directive 98/37/EC.
Idler Mounting Stance + 65mm (2.56")
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Page 6 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01
Installation
The Milltronics belt scale must be completely installed before you install the MWL.
Please refer to the belt scale installation manual for installation details.
The MWL installation has eight stages:
• Drilling the crank body mounting holes
• Mounting the crank bodies
• Mounting the torque shaft
• Installing the crank handle
• Testing the unloaded MWL
• Installing the calibration weights
• Testing the loaded MWL
• Shimming the MWL (if required)
1. Drill left and right crank body mounting holes
• Refer to the appropriate MWL installation drawing for your Milltronics belt
scale.
• Measure and mark the locations of the mounting holes for each of the crank
bodies. The left-handed unit turns clockwise to raise weights and the right-
handed unit turns counter-clockwise: handing is marked on the crank bodies.
• Drill these holes as specified for 12mm (1/2") mounting hardware.
Note: Check that there will be sufficient clearance for the MWL. (See detail, Check
Clearance for Conveyor Belt: page 8.) Clearance can be created artificially by
shimming the idlers in the scale area.
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7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 7
2. Mount left-handed and right-handed crank body
• Refer to the shim thickness tables on page 15 to determine whether you need to
shim the MWL. Shimming is not always required: it is more likely to be required
with the MUS scale, and less likely with the other models.
• If necessary, select and position the appropriate size shim(s).
• Loosely mount each crank body to the conveyor stringers using 12mm (1/2")
bolts, nuts, and washers.
Locking ball-
pin tethered
to crank body
Input shaft
Crank body
Shim (if required)
Bolt
Right-hand (counter-clockwise rotating) Crank Body Shown
Nut
Washer
Note: The crank bodies must be left loose to allow for the torque shaft installation.
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Page 8 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01
3. Mount torque shaft / Check clearance for conveyor belt
• Leave the locking ball-pins in place to hold the lifting pads of both crank bodies
in the raised position.
• Place the torque tube over the connecting shafts of the left and right crank
bodies.
• Loosely install the bolts, nuts, and washers that hold the torque tube onto the
connecting shafts.
• Hand tighten the bolts, nuts, and washers that mount the crank bodies to the
stringers.
• Hand tighten the bolts, nuts, and washers that hold the torque tube onto the
connecting shafts.
Check Clearance for Conveyor Belt
• Ensure there is 10mm (0.38") minimum clearance from the top of the torque tube
to the underside of the return belt: inadequate clearance will cause the belt to
wear.
• Allow additional clearance for belt sag.
• If necessary, shim the idlers in the scale area until the clearance is adequate.
(See the Belt Scale Instruction Manual for detailed shim procedures.)
Lifting-pad in raised position (2)
Torq ue Tu be
Connecting shaft (2)
Min.10mm (0.38") clearance to underside
of return belt + allowance for belt sag
Top of torque tube
176mm (6.94")
Top of stringers
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