Milltronics MWL Instruction Manual

MWL
MilltronicsWeight Lifter

Instruction Manual

June 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 eq uip m ent . These w ar ning 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 on ly 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, oper at ed, and maintained.

Note: Always use product in accordance with specifications.

Copyright Siemens Milltronics Process

Disclaimer of Liability

Instruments Inc. 2000. All Rights Reserved

This document is available in bound version and in
electronic version. We encourage users to
purchase authorized bound manuals, or t o view
electronic versions as designed and authored by
Siemens Milltronics Process Instruments Inc.
Siemens Milltronics Process Instruments Inc. will
not be responsible for the content s of partial or
whole reproductions of either bound or electronic
versions.

MILLTRONICS®is a registered t rademark of Siemens Milltronics Process Instruments Inc.

Contact SMPI Technical Publications at the following address:

Technical Publications
Siemens Milltronics Process Instruments Inc.
1954 Technology Drive, P.O. Box 4225
Peterborough, Ontario, Ca nad a, K9J 7B1
Email: [e-mail]

While we have verified the contents of
this manual for agreement with t he
instrumentation described, variations
remain possible. Thus we cannot
guarantee full agreement. The
contents of this manual are regularly
reviewed and corrections are included
in subsequent editions. We welc ome
all suggestions for improvement.

Technical data subject to change.

For the library of SMPI instruction manuals, visit our Web site: www.milltronics.com

© Siemens Milltronics Process Instruments Inc. 2001

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

7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 1

Milltronics Weight Lifter (MWL):
Introduction

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.

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 manually­applied 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

Page 2 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01

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

Shaft Extension
(optional)

Input Shaft (2)

Crank
Handle

Connecting Shaft

Torq ue Tu be

Torq ue Tu be

Right-handed
Crank Body

Lifting-pad (2)

Guide-pin (2)

Connecting Shaft (2)

Left-handed Crank Body

Base-bar Weight

Cut-away view of Gear Drive

(Left-hand, clockwise-rotating crank-body shown)

Worm Gear

Travel Sto p

Input Shaft

Guide-pin

Lifting-pad (lifts
as it rotates)

Removable

Travel Sto p

Plate Guide

Drive Plate

Output Shaft

Crank Handle

7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 3

Calibration Weight Arrangement

Flat Bar Style Calibration Weights

Flat Bar Calibration Weights

Flat Bar Base-bar Weight

U-bracket
(supplied with
MWL)

Horseshoe Style Calibration Weights

Horseshoe-style Calibration Weights

Horseshoe-style
Base-bar Weight

The horseshoe weights are not symmetrical:
an offset channel locates them on the base-bar weight.

Rotate alternate weights through 180
are staggered, to stabilize the base-bar weight.

o

so that the weights

offset

Page 4 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01

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

Idler Mounting Stance + 65mm (2.56")

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.

7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 5

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.

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.

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 right­handed unit turns counter-clockwise: handing is marked on the crank bodies.

• Drill these holes as specified for 12mm (1/2") mounting hardware.

Page 6 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01

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.

Right-hand (counter-clockwise rotating) Crank Body Shown

Crank body

Input shaft

Locking ball­pin tethered
to crank body

Shim (if required)

Bolt

Wash er

Nut

Note: The crank bodies must be left loose to allow for the torque shaft installation.

7ML19981CR01 Milltronics Weight Lifter MWL – Instruction Manual Page 7

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.

Torq ue Tub e

Connecting shaft (2)

Lifting-pad in raised position (2)

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.)

Min.10mm (0.38") clearance to underside
of return belt + allowance for belt sag

Top of torque tube

176mm (6.94")

Top of stringers

Page 8 Milltronics Weight Lifter MWL – Instruction Manual 7ML19981CR01