DALIN DLVC Installation and operating instructions

DLVC
Installation,Operatio
and Maintenance
of VC Clutches
HENAN DALIN RUBBER AND TELECOMMUNICATIONS APPARATUS CO.,LTD
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Table of Contents
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Clutch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Mounting Arrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Mounting Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Mounting Spider and Drum Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Shaft Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Axial Locking Device Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6 Installation of Element and Drum (Narrow, Dual Narrow and Single Wide) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.7 Installation of Element and Drums (Dual Wide) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8 Air Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9 Electrical Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 Torque, RPM and Pressure Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Control Component Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2 Removal of Element Assembly and Drum (Narrow, Dual Narrow and Single Wide) . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.3 Removal of Element Assemblies and Drums (Dual Wide) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.4 Removal of Spider and Drum Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.5 Disassembly of the Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.6 Friction Lining Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.7 Assembly of the Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.0 SPARE PARTS STORAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Element Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Drums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Air Actuating Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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Table of Contents
6.0 ORDERING INFORMATION/ TECHNICAL ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Equipment Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.0 PARTS LISTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.1 Single Narrow Element Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 Dual Narrow Element Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Single Wide Element Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.4 Dual Wide Element Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.5 Drums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7.6 Axial Locking Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7.7 Friction Block and Rivet Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7.8 Friction Shoe Assembly, Torque Bar and Release Spring Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.0 REVISION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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VC GRINDING MILL CLUTCHES
Figure 1 : Component Parts for Dalin Type VC Element
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1.0 INTRODUCTION
Throughout this manual there are a number of HAZ-
ARD WARNINGS that must be read and adhered to in
order to prevent possible personal injury and/or dam-
age to equipment. Three signal words “DANGER”,
“WARNING” and “CAUTION” are used to indicate the
severity of a hazard, and are preceded by the safety
alert symbol
Denotes the most serious hazard, and is used
when serious injury or death WILL result from
misuse or failure to follow specific instruc-
tions.
Used when serious injury or death MAY result
from misuse or failure to follow specific
instructions.
Used when injury or product/equipment dam-
age may result from misuse or failure to fol-
low specific instructions.
It is the responsibility and duty of all personnel
involved in the installation, operation and maintenance
of the equipment on which this device is used to fully
understand the:
procedures by which hazards can be avoided.
1.1 Description
1.1.1 The Dalin air-actuated VC clutch is specifically
designed and manufactured for severe service
encountered in grinding mill operations, where high
starting loads and sustained slippage would normally
lower clutch efficiency and reduce operating life. Con-
stricting action and ventilated construction make high
torque capacity and rapid heat dissipation possible.
1.1.2 All Dalin VC elements are supplied with long wear-
ing, NON-ASBESTOS friction material.
1.1.3 Dalin element assemblies are available for drum
diameters from 11.5 inches through 76 inches.The
element size designation indicates the nominal drum
diameter in inches, the clutch model and the width of
the friction material. For example, size “38VC1200”
indicates the element operates on a drum having a
nominal diameter of 38 inches, is an Dalin ‘VC’
series clutch and has friction material which is 12
inches wide.
1.1.4 Where diameter space is limited, or the torque
required is greater than a single element can transmit,
all sizes of Dalin VC elements can be supplied as
dual units.
1.2 How It Works
1.2.1 Referring to Figures 1 and 2, the neoprene and cord
actuating tube is contained within a steel rim which is
drilled for mounting to the driving component. As air
pressure is applied to the air actuating tube, the tube
inflates, forcing the friction shoe assemblies uniformly
against the drum, which is attached to the driven com-
ponent. The friction shoe assemblies, which consist of
friction blocks attached to aluminum backing plates,
are guided by torque bars which are secured to side
plates. The torque flow is from the driving shaft,
through the element mounting component (typically
an iron spider), through the rim/side plate structure,
through the torque bars to the backing plates and fric-
tion material, where the torque is transmitted through
the friction couple to the components mounted on the
driven shaft (clutch drum and drum mounting compo-
nent). As actuating air is exhausted, release springs
and centrifugal force assure positive disengagement.
1.2.1.1 In some cases, the spider and element assembly may
be mounted to the driven shaft rather than the driving
shaft. This “reverse-mounted” arrangement is typically
used when retrofitting a mill drive and it is more practi-
cal to drill the pinion shaft for the air supply rather than
the motor shaft In these cases, the operation and
torque flow description is opposite to what is stated
above.
1.2.2 For applications where the clutch is mounted on a
motor shaft having plain bearings, an axial locking
device is used to hold the motor on magnetic center
during operation. Refer to the INSTALLATION
section for axial locking device adjustment.
1.2.2.1 Figure 3A illustrates another type of axial locking
device called a separation restraint. This device is
attached to the clutch rim as shown, with a bronze
wear pad which rides against the clutch drum to
restrict axial movement.
Note : There is no relative motion between the drum
and wear pad when the clutch is fully engaged.
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Figure 2
1.3 Clutch Adjustment
1.3.1 clutches are completely self-adjusting and
automatically compensate for lining and drum wear.
Lubrication is not required. The torque developed is
dependent upon rotating speed and applied air pres-
sure. By limiting the applied pressure, the element will
act as a torque limiting device and provide overload
protection.
Figure 3
1.3.2 To achieve the desired mill acceleration tim ow
control valve is installed in the clutch air supply line
and adjusted to restrict air to the clutch, while
allowing free ow away from the clutch for rapid disen-
gagement. By adjusting he rate of engage-
ment may be varied. Note th at theow control valve
does not regulate air pressure the supply pressure
must always be adequate to transmit the maximum
required torque. Refer to the INSTALLATION section
of this manual for a recommended air piping u-
ration and the OPERATION section for control
valve adjustment.
Figure 3A
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2.0 INSTALLATION
Only qualified personnel should install, adjust or
repair these units. Faulty workmanship will
result in exposure to hazardous conditions or
personal injury.
Do not inflate the element without having a
drum in place. Inflation of the element without
a drum in place will result in permanent dam-
age to the element components.
2.1 Mounting Arrangements
2.1.1 Dalin VC grinding mill clutch applications are avail-
able in single-narrow, single-wide, dual-narrow and
dual-wide mounting configurations. See Figure 4. The
clutch configuration is determined by the motor horse-
power and RPM, the allowable motor overload (per
cent rated horsepower) for mill starting, the inertia of
the mill and the charge, and the physical space avail-
able for the clutch. With the exception of single-narrow
arrangements, all clutches can be supplied with axial
locking devices.
2.2 Mounting Considerations
2.2.1 Shaft alignment must be within the tolerances indi-
cated in the Alignment section of this manual.
Operation with shaft misalignment exceeding
the limits indicated in this manual will result
in accelerated wear of the clutch components.
2.2.2 The element must be protected from contamination
from oil, grease or excessive amounts of dust.
Oil or grease contamination will result in a
reduction of developed torque. Excessive
dust contamination may result in incomplete
disengagement. Either of these conditions
will result in clutch slippage and overheating.
All rotating equipment must be guarded to
comply with applicable safety standards.
Figure 4
2.2.3 All mounting fasteners must be of the proper size and
grade, and torqued to the appropriate value. See
Table 1.
Use only the proper grade and number of
mounting fasteners. Using commercial grade
fasteners (Grade 2) in place of Grade 8 fasten-
ers (where called for) may result in failure
under load, causing personal injury or equip-
ment damage.
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TABLE 1
FASTENER ASSEMBLY TORQUE
SN = SINGLE NARROW
SW = SINGLE WIDE
DN = DUAL NARROW
DW = DUAL WIDE
L = LUBED TORQUE - FT.LB. (Nm) (30 WT. MOTOR OIL OR ANTI-SEIZE)
D = DRY TORQUE - FT.LB. (Nm)
SIZE ELEMENT TO SPIDER/SIDE
PLATE TO RIM TORQUE DRUM TO HUB TORQUE
SN 11.5VC500 3/8-16NC GR 2 D 15 (20) 1/2-13NC GR 2 D 38 (51)
SN14VC500 1/2-13NC GR 2 D 15 (20) 1/2-13NC GR 2 D 38 (51)
SN16VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SN20VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SN24VC650 5/8-11 NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SN28VC650 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SN33VC650 3/4-10 NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SN37VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SN42VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
DN 11.5VC500 3/8-16NC GR 2 D 15 (20) 1/2-13NC GR 8 D 109 (148)
DN14VC500 1/2-13NC GR 8 D 87 (118) 1/2-13NC GR 2 D 38 (51)
DN16VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 8 L 245 (332)
DN20VC600 1/2-13NC GR 8 D 87 (118) 3/4-10NC GR 8 L 211 (286)
DN24VC650 5/8- 11 NC GR 2 D 77 (104) 3/4-10NV GR 2 L 93 (126)
DN28VC650 5/8- 11 NC GR 2 D 77 (104) 3/4-10NV GR 2 L 93 (126)
DN33VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
DN37VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
DN42VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SW 14VC1000 1/2-13NC GR 2 D 38 (51) 1/2- 13NC GR 8 L 109 (148)
SW 16VC1000 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SW 20VC1000 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SW24VC1000 5/8-11 NC GR 2 D 77 (104) 3/4- 10NC GR 2 L 93 (126)
SW28VC1000 5/8-11 NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SW32VC1000 5/8-11 NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SW38VC1200 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
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SIZE ELEMENT TO SPIDER/SIDE
PLATE TO RIM TORQUE DRUM TO HUB TORQUE
SW42VC1200 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SW46VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW52VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW51VC1600 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW60VC1600 1-8NC GR 2 L 163 (221) 1 1/2-6NC GR 2 L 566 (767)
SW66VC1600 1 1/4-7NC GR 2 L 325 (441) 1 1/2-6NC GR 2 L 566 (767)
DW 16VC1000 1/2-13NC GR 8 D 87 (118) 3/4-10NC GR 8 L 245 (332)
DW20VC1000 1/2-13NC GR 8 D 87 (118) 3/4- 10NC GR 8 L 245 (332)
DW24VC1000 5/8- 11 NC GR 8 D 174 (236) 3/4- 10NC GR 8 L 245 (332)
DW28VC1000 5/8- 11 NC GR 8 D 174 (236) 3/4- 10NC GR 8 L 245 (332)
DW32VC1000 5/8- 11NC GR 8 D 174 (236) 3/4- 10NC GR 8 L 245 (332)
DW38VC1200 3/4-10NC GR 8 L 245 (332) 3/4- 10NC GR 8 L 245 (332)
DW42VC1200 3/4-10NC GR 8 L 245 (332) 3/4- 10NC GR 8 L 245 (332)
DW46VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 8 L 510 (692)
DW52VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 8 L 510 (692)
DW51VC1600 7/8-9NC GR 2 L 163 (221) 1-8NC GR 8 L 510 (692)
DW60VC1600 1-8NC GR 2 L 190 (258) 1 1/2-6NC GR 2 L 650 (881)
DW66VC1600 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
DW76VC1600 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
DW76VC2000 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
HEX SIZES (in.)
SIZE BOLT NUT SIZE BOLT NUT SIZE BOLT NUT
3/8NC 9/16 9/16 3/4NC 1-1/8 1-1/16 1-1/4NC 1-7/8 1-13/16
1/2NC 3/4 3/4 7/8NC 1-5/16 1-1/4 1-1/2NC 2-1/4 2-3/16
5/8NC 15/16 15/16 1NC 1-1/2 1-7/16
TABLE 1
FASTENER ASSEMBLY TORQUE
SN = SINGLE NARROW
SW = SINGLE WIDE
DN = DUAL NARROW
DW = DUAL WIDE
L = LUBED TORQUE - FT.LB. (Nm) (30 WT. MOTOR OIL OR ANTI-SEIZE)
D = DRY TORQUE - FT.LB. (Nm)
9

2.3 Mounting Spider and Drum Hub
2.3.1 The spider and drum hub are bored for a press fit onto
their respective shafts. The interference is approxi-
mately 0.0005 inch per inch (0.0005 mm/mm) of shaft
diameter.
2.3.2 Ensure the shaft is dean and free of nicks or burrs and
check the shaft and bore diameters for proper fit. Tap
the key into the keyway, making sure it bottoms, and
apply a light coat of anti-seizing compound to the shaft
and key.
2.3.3 Heat the drum hub or spider uniformly to 250°F
(121°C) to expand the bore.
It is recommended the drum hub or spider be
heated in oil or an oven; however, torches
may be used. Use several with “rosebud”
(broad-flame) tips and keep them moving to
avoid "hot spots". Check bore temperature
frequently to avoid overheating.
2.3.4 Slide the heated drum hub or spider onto the shaft.
Hold in position and allow to cool.
2.4 Shaft Alignment
Parallel Alignment Tolerance
(Offset):
Not to exceed 0.010 inch (0.254 mm) Total Indica-
tor Reading (0.005 inch (0.127mm) maximum off-
set).
Figure 5
TABLE 2
“X” DIMENSIONS (FIG. 5)
SIZE “X” IN. (mm) SIZE “X” IN. (mm) SIZE “X” IN. (mm) SIZE “X” IN. (mm)
SN11.5VC500 6.750 (171.5) DN 11.5VC500 13.375 (339.7) SW14VC1000 11.875 (301.6)
SN14VC500 6.812 (173.0) DN14VC500 13.438 (341.3) SW16VC1000 11.875 (301.6) DW16VC1000 12.750 (323.9)
SN16VC600 8.062 (204.8) DN16VC600 15.938 (404.8) SW20VC1000 11.875 (301.6) DW20VC1000 12.750 (323.9)
SN20VC600 8.062 (204.8) DN20VC600 15.938 (404.8) SW24VC1000 11.875 (301.6) DW24VC1000 12.750 (323.9)
SN24VC650 8.562 (217.5) DN24VC650 16.688 (423.9) SW28VC1000 11.875 (301.6) DW28VC1000 12.750 (323.9)
SN28VC650 8.562 (217.5) DN28VC650 16.688 (423.9) SW32VC1000 11.938 (303.2) DW32VC1000 12.812 (325.4)
SN33VC650 8.562 (217.5) DN33VC650 16.750 (425.5) SW38VC1200 14.125 (356.7) DW38VC1200 15.000 (381.0)
SN37VC650 8.562 (217.5) DN37VC650 16.750 (425.5) SW42VC1200 14.125 (358.7) DW42VC1200 15.125 (384.2)
SN42VC650 8.562 (217.5) DN42VC650 16.750 (425.5) SW46VC1200 14.125 (358.7) DW46VC1200 15.250 (387.4)
SW52VC1200 14.625 (371.5) DW52VC1200 15.750 (400.0)
SW51VC1600 18.875 (479.4) DW51VC1600 20.000 (508.0)
SW60VC1600 18.750 (476.31) DW60VC1600 20.375 (517.5)
SW66VC1600 20.500 (520.7) DW66VC1600 22.000 (558.8)
SW76VC1600 Contact Factory DW76VC1600 20.375 (517.5)
SW76VC2000 Contact Factory DW76VC2000 24.374 (619.1)
10

Angular Alignment Tolerance (Gap):
Not to exceed 0.0005 inch per inch (0.0005 mm/
mm) diameter at which readings are taken (“D” on
Figure 5).
Note : The alignment procedure described below has
been used successfully on many VC grinding mill
clutch applications. Other procedures, of course, may
be used; however, the alignment tolerances are the
same regardless of the technique used.
2.4.1 Foundations must be set so distance "X", shown on
Figure 5 (or the appropriate drawing for non-standard
applications), is established. If the clutch is mounted
on a shaft having plain bearings, make sure the shaft
is centered within the bearings when establishing the
"X" dimension. Refer to Table 2 for appropriate "X"
dimensions.
Note : It is presumed that one of the shafts has been
properly located and anchored. When setting and
aligning the grinding mill drive components, always
work from the pinion back to the motor.
2.4.2 Fabricate a rigid bracket for supporting a dial indicator
and attach to the spider. Figure 5.
2.4.3 Thoroughly clean the flange O.D. and the face of the
drum hub where alignment readings are to be taken.
2.4.4 Rotate the spider and take parallel alignment readings
off the drum hub flange O.D. If both shafts can be
rotated together, the alignment readings are less influ-
enced by any surface irregularities.
Note : On reverse-mounted clutches where only one
shaft can be rotated, the indicator is attached to the
drum hub and readings are taken off of the spider O.D.
When recording parallel alignment readings,
“sag” of the indicator/indicator bracket must
be accounted for.
2.4.5 Angular alignment readings can be made by accu-
rately measuring the gap between the spider and
drum hub faces with an inside micrometer. If a dial
indicator is used, make sure to monitor and correct for
any axial movement of the shaft. To reduce the influ-
ence any surface irregularities may have on the angu-
lar alignment readings, index the spider 90 degrees
after taking the initial set of readings. Take an addi-
tional set of readings and index the spider another 90
degrees. Continue in this manner until four sets of
readings have been taken. For misalignment correc-
tion, use the average of the four readings at each
position.
2.4.6 Shim and shift the base of the movable shaft to correct
the misalignment. After tightening the base, recheck
the alignment and correct if necessary. Make sure to
check for a “soft foot” condition. Dowel or chock into
position after satisfactory alignment has been
achieved.
Note : On some applications, thermal growth of the
mill or gear reducer (if present) may result in unac-
ceptable shaft alignment in a running condition. It is
always a good practice to make a “hot alignment”
check and the shim if necessary.
2.5 Axial Locking Device Adjustment
2.5.1 If the "X" dimension shown on Table 2 could not be
achieved within +/- 0.250 inch (6.4mm), the axial lock-
ing device has a provision to accommodate this varia-
tion.
2.5.2 Position the motor shaft on its magnetic center and
measure the gap between the faces of the drum hub
and spider ("X" dimension on Table 2). The difference
between this measured dimension and the value
shown on Table 2 is the amount of correction to be
made with adjustment of the axial locking device.
2.5.3 Referring to Figure 6, the overall length of the axial
locking device can be adjusted by relocating shims
(11,16) from one side of a bearing to another.
2.5.3.1 Remove four hex head screws and lock washers (6,7)
from the bearing housing (8) and adapter plate
(1 or 9).
2.5.3.2 Remove the snap ring (2) from the bearing housing.
2.5.3.3 After ensuring the shaft (3) is clean and free of foreign
matter, nicks or burrs in the area between the two
bearing housings, slide the bearing housing assembly
toward the opposite bearing housing assembly to
expose the bearing/spacer assembly (10,11,16).
11

Figure 6
2.5.3.4 Remove the bearing locknut and lockwasher (13,14)
from the shaft.
2.5.3.5 The assembled length of the axial locking device is
established by the location of the bearings with
respect to the shaft. The assembled length can there-
fore be adjusted by moving spacers from one side of
the bearing to the other. Two thicknesses of spacers
are included in each assembly (0.025 inch (0.6 mm)
and 0.098 inch (2.5 mm)). After making the appropri-
ate assembled length adjustment, reassemble, mak-
ing sure the thinner spacers are against the bearing.
2.5.3.6 Tighten the locknut sufficiently to take up all axial
clearance in the bearing/spacer/snap ring assembly.
2.5.3.7 Slide the housing back over the bearing and install the
snap ring.
2.5.3.8 Secure and tighten the bearing housing to the adapter
plate using four hex head screws and lockwashers.
Tighten the screws to 35 ft.lb. (47Nm).
2.5.3.9 After completing assembly, lubricate both bearings
with No. 2 EP grease.
2.6 Installation of Element and Drum
(Narrow, Dual Narrow and Single
Wide)
2.6.1 Note the orientation of the drum flange with respect to
the air connection(s) on the element and slide the
drum into the element.
2.6.2 Attach the axial locking device (if required) to the drum
flange with the appropriate screws and lockwashers.
There are tapped holes in the drum flange to accept
the screws.
2.6.3 Separate the shafts as far as the bearing clearances
will allow and hoist the element/drum (axial locking
device) into position. If an axial locking device is used,
take special care when hoisting the element between
the shafts. The axial locking device mounting plate
binds easily against the spider face.
2.6.4 Attach the drum to the drum hub with the appropriate
fasteners. See Table 1. Make sure the bore in the
drum flange fully engages the pilot on the drum hub.
2.6.5 Install the air connection gaskets onto the air tubes.
The metal backup washer is to be positioned toward
the elbow (away from the spider). See Figure 7.
Note : Some older elements use a flanged air connec-
tion tube and a thin gasket. See Table 3 for correct
part numbers.
Figure 7
2.6.6 Align the element air connections with the passages in
the spider and attach the element to the spider with
12

the appropriate fasteners. See Table 1. Make sure the
element fully engages the register in the spider.
2.6.7 Attach the axial locking device (if required) mounting
plate to the spider with the appropriate screws and
lock washers. Rotate the motor shaft and push the spi-
der towards the mill until the axial locking device
mounting plate is flush against the spider face. Tighten
the screws.
Do not attempt to pull the motor shaft back
onto magnetic center by tightening the axial
locking device mounting screws. To do so will
damage the axial locking device.
2.7 Installation of Element and Drums
(Dual Wide)
2.7.1 Separate the shafts as far as the bearing clearances
will allow.
2.7.2 Attach the drum having the female register on the
drum flange to the drum hub with short screws and
lockwashers. There are tapped holes in the drum
flange to accept the screws. Make sure the bore in the
drum flange fully engages the pilot on the drum hub.
See Figure 4.
2.7.3 Disassemble the dual element into two halves and,
noting the orientation of the air connections, place the
element onto the drum installed in 2.7.2.
2.7.4 Noting the orientation of the flange on the remaining
drum with respect to tie air connections on the remain-
ing element, slide the drum into the element.
2.7.5 Attach the axial locking device (if required) to the
flange of the remaining drum with the appropriate
short screws and lockwashers. There are tapped
holes in the drum to accept the screws.
2.7.6 Hoist the element/drum (axial locking device) into
position, align the tapped holes in the drum having the
male pilot with the tapped holes in the drum attached
to the drum hub, and attach both drums to the drum
hub with the appropriate fasteners. See Table 1. Make
sure the male pilot fully engages the female register. If
an axial locking device is used, take special care when
hoisting the element between the shafts. The axial
locking device mounting plate binds easily against the
spider face.
2.7.7 Align the air connections and reassemble the element
halves, making sure the spacers are in place between
the elements. See Figure 8.
2.7.8 Reassemble the air connection tubes. If an elbow has
been removed, use a good quality pipe sealant on the
threads. See Figure 8.
Note : The elbow assemblies on the outboard element
(farthest from the spider) use rubber compression
sleeves. Make sure the sleeves are secure on the long
air tubes.
2.7.9 Install the air connection gaskets onto the air tubes.
The metal backup washer is to be positioned toward
the elbow (away from the spider). See Figure 7.
2.7.10 Align the element air connections with the correspond-
ing passages in the spider and attach the element to
the spider with the appropriate fasteners. See Table 1.
Make sure the element fully engages the register in
the spider.
2.7.11 Attach the axial locking device mounting plate (if
required) to the spider with the appropriate screws
and lockwashers. Rotate the motor shaft and push the
spider toward the mill until the axial locking device
mounting plate is flush against the spider face. Tighten
the screws.
Do not attempt to pull the motor shaft back
onto magnetic center by tightening the axial
locking device mounting screws. To do so will
damage the axial locking device.
13

TABLE 3
AIR CONNECTIONS FOR VC ELEMENTS
SIZE AIR TUBE WASHER AIR TUBE WASHER
11.5VC500 201402 72 x 15 412178-02 412324-01
14VC500 201302 72 x 11 412178-03 412324-02
16VC600 201302 72 x 11 412178-03 412324-02
20VC600 201302 72 x 11 412178-03 412324-02
24VC650 201286 72 x 12 412178-05 412324-03
28VC650 201286 72 x 12 412178-05 412324-03
33VC650 201284 72 x 13 412178-06 412324-04
37VC650 201284 72 x 13 412178-06 412324-04
42VC650 201284 72 x 13 412178-06 412324-04
14VC1000 201302 72 x 11 412178-03 412324-02
16VC1000 202408 72 x 11 412178-03 412324-02
20VC1000 201302 72 x 11 412178-03 412324-02
24VC1000 201286 72 x 12 412178-05 412324-03
28VC1000 201286 72 x 12 412178-05 412324-03
32VC1000 201286 72 x 12 412178-05 412324-03
38VC1200 201284 72 x 13 412178-06 412324-04
42VC1200 201284 72 x 13 412178-06 412324-04
46VC1200 202081 72 x 13 412178-07 412324-04
52VC1200 202751 72 x 14 412178-08 412324-05
51VC1600 304213 72 x 14 412178-09 412324-05
60VC1600 304213 72 x 14 412178-18 412324-06
66VC1600 - - 412178-04 412324-06
76VC1600 - - 412178-04 412324-06
76VC2000 - - 412178-04 412324-06
14

.
Figure 8
2.8 Air Control System
2.8.1 A typical air control system is shown on Figure 9.
Since operating characteristics vary from one grinding
mill to another, following are some general guidelines
for installing the air controls.
2.8.1.1 The air receiver tank must be located as close to the
clutch as possible (the tank should be located within
15 feet of the solenoid valve, and solenoid valve
should be within five feet from the rotorseal) for con-
sistent clutch response.
2.8.1.2 Use full size piping and valves consistent with the
rotorseal size and keep the number of elbows to a
minimum.
2.8.1.3 Use poppet-type solenoid valves. Spool valves are not
recommended.
2.8.1.4 An air line lubricator is not required for the clutch ele-
ment; however, if one is used, it must be a nonadjust-
able, mist-type.
2.8.1.5 Make sure the flow control valve is installed with free
flow (indicated by an arrow on the valve body) away
from the clutch (free flow to exhaust).
2.8.1.6 The final connection to the rotorseal MUST be made
with flexible hose and place no radial load upon the
rotorseal. Also, if the rotorseal is mounted onto the
end of a motor shaft, an insulating coupling must be
installed between the piping and the rotorseal.
Do not use rigid pipe at the connection to the
rotorseal. Rigid piping will result in excessive
loads on the rotorseal bearings, shortening
life.
2.9 Electrical Controls
2.9.1 The basic Dalin grinding mill clutch control is shown
on Figure 10. This control provides run, inch and
timed inch features only. Timed inch creates a delay
between successive clutch engagements when spot-
ting the mill to prevent clutch overheating and dam-
age. Other control features, such as clutch slip
detection, can be provided as required. Contact Dalin
for details.
15

Figure 9 : AIR PIPING DIAGRAM FOR GRINDING MILLS
Hose Assembly
Note: Locate complete air tank within 5 feet of
the rotorseal. Consult factory when locating
air tank at greater distances.
Note: All pipe not identified with part
numbers are to be furnished by customer.
Fiber Coupling
Pipe Nipple
Rotorseal Pipe Elbow
Pressure Gauge
Bushing
Pipe Tee Flow Control Valve
Pipe Nipple
3-way N/C
Solenoid Valve
Free flow in direction shown.
For adjustment refer to form VC5001.
Flow control valve shown is 1-1/4 NPT (42 x 220).
Pressure Switch
Set at min p.s.i. 1.5 to 5 and interlock with
motor starter so motor cannot be started with
clutch engaged. Use normally closed contacts.
Clutch
Pipe Nipple
Pipe Tee
Pressure Gauge
Relief Valve
Pressure Regulator
Typically set at 100 p.s.i.
Typically set at 90 p.s.i. so clutch will disengage
when supply air pressure drops below this setting.
Use normally open contacts.
Pipe Nipple
Main Air Supply
Filter
Air Tank
Drain Valve
Pipe Nipple
Pressure Switch
Bushing
Bushing
Check Valve
Bushing
Flow control valve 1/2, 3/4 & 1-1/2 N
P
Single Dual Single Dual OLD OLD NEW NEW
Narrow Narrow Wide Wide Pipe Size P/N LA Drawing P/N LA Drawing
11.5 to 16 1/2" 105248 LA-10720 n/a n/a
20 to 28 11.5 to 20 14 to 20 1/2" 105248A LA-10721 108702 LA-11702
33 to 42 24 to 28 24 to 28 16 3/4" 105248B LA-10722 108703 LA-11703
33 to 37 32 20 to 24 1" 105248C LA-10723 108704 LA-11704
42 38 to 42 28 to 32 1 1/4" 105248D LA-10724 108705 LA-11705
46 38 1 1/2" 105248E LA-10725 108706 LA-11706
51 to 66 42 to 46 1 1/2" 105248AP LA-10726 108707 LA-11707
76 51 to 66 1 1/2" 105248AQ LA-10727 108708 LA-11708
76(1600 & 2000) 2" n/a LA-10728 108709 LA-11709
20 to 28 11.5 to 20 14 to 20 1/2" 108248A LA-10701 108602 LA-11602
33 to 42 24 to 28 24 to 28 16 3/4" 108248B LA-10702 108603 LA-11603
33 to 37 32 20 to 24 1" 108248C LA-10703 108604 LA-11604
42 38 to 42 28 to 32 1 1/4" 108248D LA-10704 108605 LA-11605
46 38 1 1/2" 108248E LA-10705 108606 LA-11606
51 to 66 42 to 46 1 1/2" 108248F LA-10706 108607 LA-11607
76 51 to 66 1 1/2" 108248G LA-10707 108608 LA-11608
76(1600 & 2000) 2" 108248H LA-10708 108609 LA-11609
20 to 28 11.5 to 20 14 to 20 1/2" 108094A LA-11191
33 to 42 24 to 28 24 to 28 16 3/4" 108094B LA-11192
33 to 37 32 20 to 24 1" 108094C LA-11193
42 38 to 42 28 to 32 1 1/4" 108094D LA-11194
46 38 1 1/2" 108094E LA-11195
51 to 66 42 to 46 1 1/2" 108094F LA-11196
76 51 to 66 1 1/2" 108094G LA-11197
76(1600 & 2000) 2" 108094H LA-11198
Quadramatic
66 and 76 2" 108094GS LA-11197-11 NO CHANGE NO CHANGE
Super Premium
Air Tank Groups
n/a
Use Premium
n/a
Use Premium
Premium
Standard
Standard Air Tank Group
16

Figure 10 : WIRING DIAGRAM FOR GRINDING MILL CONTROL PANEL REFERENCE : LA- 9811
17

3.0 OPERATION
Exceeding the operating limits described in
this section may result in personal injury or
equipment damage.
3.1 Torque, RPM and Pressure Limits
3.1.1 The developed torque is directly proportional to the
applied air pressure. If the developed torque seems
inadequate, check for oil, grease or dust contamina-
tion.
Maximum applied air pressure is 125 psig (8.5
bar). Operation at pressures exceeding 125
psig may result in damage to the clutch ele-
ment 'DOLQ grinding mill clutches typically
require only 100 psig (6.8 bar) operating pres-
sure.
The non-asbestos friction material used in
'DOLQVC units may not develop rated torque
initially, as a short “Wear-in” period is
required. It is very important that the first few
mill starts be monitored to prevent excessive
heat generation from slippage.
3.1.2 Maximum safe operating speeds are shown on
Table 5
Do not exceed the operating speeds shown
on Table 5. Operation at speeds greater than
allowable will result in permanent damage to
the clutch element, personal injury or death.
3.2 Control Component Adjustment
The following section gives "typical" component set-
tings only. Since operating characteristics vary from
one grinding mill to the next, absolute values cannot
be given. The settings described below offer a good
“starting point" to achieve satisfactory mill acceleration
and motor overload - some "fine tuning” will probably
be required.
3.2.1 Set the pressure switch (5) located on the air receiver
tank to open at 90 psig (6.1 bar) falling. Use normally
open contacts and wire in series with the solenoid
valve coil. This pressure switch is used to disengage
the clutch if operating pressure falls below 90 psig (6.1
bar), or to prevent clutch engagement if operating
pressure is below 90 psig (6.1) bar.
3.2.2 Set the pressure switch (13) located in the air supply
line to the clutch to open at approximately 5 psig (0.3
bar). Use normally closed contacts and wire into the
motor starter interlock circuit. The purpose of this
pressure switch is to prevent starting the motor with
the clutch engaged.
3.2.3 Set the pressure regulator (3) to 100 psig (6.8 bar).
This is the nominal starting air pressure for the mill.
3.2.4 With the motor "off", manually trip the solenoid valve
and note the time elapsed for the pressure gauge (7)
to register full tank pressure.
TABLE 5
MAXIMUM SAFE OPERATING SPEEDS
Size
(Narrow)
Maximum
RPM
Size
(Narrow)
Maximum
RPM Size (Wide) Maximum RPM Size (Wide) Maximum RPM
11.5VC500 1800 28VC650 1000 14VC1000 1800 42VC1200 670
14VC500 1500 33VC650 900 16VC1000 1400 46VC1200 600
16VC600 1400 35VC650 900 20VC1000 1300 52VC1200 550
20VC600 1200 37VC650 800 24VC1000 1250 51VC1600 550
24VC650 1050 42VC650 800 28VC1000 1100 60VC1600 520
32VC1000 1050 66VC1600 480
38VC1200 740 76VC1600 275
76VC2000 275
18

3.2.5 Repeat the above procedure while adjusting the flow
control valve (11) to supply a pressure rate of approxi-
mately 20 psig/sec. (1.4 bar/sec.). Due to the non-lin-
earity of the pressure-time curve (See Figure 11), it
will be easier to use a reduced value to set the flow
control valve. For example, if the tank pressure is 100
psig (6.8 bar), to obtain a flow rate of 20 psig/sec. (1.4
bar/sec.), time the pressure build up to 80 psig (5.4
bar) and adjust the flow control valve to deliver this
pressure in 4 seconds, which, for all practical pur-
poses, would equate to the desired 20 psig/sec. (1.4
bar/sec.).
Figure 11
3.2.5.1 The flow rate is increased by turning the flow control
valve adjusting screw clockwise on the 3/4”, 1” and 1 -
1/4” valves, and counter-clockwise on the 1-1/2” valve.
The 1-1/2” valve has wrench flats on the adjusting
screw. The 1-1/4” valve has a knurled adjusting knob.
The 3/4” and 1" valves have slotted adjusting screws.
3.2.6 Manually engage the clutch several times to verify the
flow control valve setting. Also, confirm operation of
the pressure switches at this time.
3.2.7 Check all other interlocks that affect the starting of the
mill and remove any jumpers that may have been
installed.
The flow rate described typically will result in
a 4-7 second mill acceleration time (timed
from the instant the clutch shoes make con-
tact with the drum to the instant the clutch
locks up); however, since operating charac-
teristics vary from mill to mill, the mill acceler-
ation at the above flow setting may be greater
or less than the allowable 4-7 second range.
The non-asbestos friction material used on
Dalin VC clutches may not develop rated
torque initially, as a short “wear-in” period is
required. It is very important that the first few
mill starts be monitored closely to prevent
damage to the clutch components.
3.2.8 Start the motor and engage the clutch, noting the mill
acceleration time. ABORT THE START IF THE
CLUTCH SLIPS FOR MORE THAN SEVEN SEC-
ONDS!
3.2.9 Disengage the clutch (if the start has not been
aborted) and allow the drum(s) to cool to room tem-
perature. Make the appropriate adjustment to the flow
control valve if the mill acceleration fell outside of the
4-7 second range and retry. Repeat until the desired
acceleration time has been achieved.
Note : If the motor overload is beyond allowable limits
during the start (typically the result of too high operat-
ing pressure), reduce the operating pressure and
increase the flow rate. If the motor is sized correctly
for the mill load conditions, the overload on the motor
is directly proportional to the applied air pressure - not
the flow rate.
Figure 12
19

4.0 MAINTENANCE
Only qualified personnel should maintain and
repair these units. Faulty workmanship may
result in personal injury or equipment dam-
age.
When replacing clutch components, use only
genuine, 'DOLQ replacement parts. Use of
replacement material which is not of 'DOLQ
origin will void all warranties.
4.1 Periodic Inspection
4.1.1 The following items may be inspected without disas-
sembly of the clutch:
4.1.1.1 Friction Shoe Assembly Lining Wear - Check the
lining thickness and compare to the values shown on
Table 6. If the linings have worn to minimum allowable
thickness or less, they must be replaced as a com-
plete set.
Operation with friction material worn to less
than minimum allowable thickness will result
in damage to the drum.
Note : A wear indicating groove (See Figure 12) is
provided on each end of the friction block. The maxi-
mum wear point, which coincides with the values
shown on Table 6, is at the bottom of the groove.
4.1.1.2 Contamination of Shoes or Drum - Oil or grease
contamination will reduce the developed torque of the
clutch. Disassembly will be required to clean any oil or
grease buildup. In extremely dusty environments, dust
may accumulate in the backing plate cavities to the
point where the friction shoes will not properly retract.
Dust accumulations may be vacuumed out of the cavi-
ties.
Do not attempt to use a solvent to remove oil
or grease without first removing the element.
While squirting a solvent into an installed
clutch may improve performance temporarily,
a fire hazard exists from the heat generated
during slippage.
Do not use compressed air to blow dust accu-
mulations out of the backing plates. Although
the friction material does not contain asbes-
tos, the dust created as the friction material
wears, along with the dust from the operating
environment, may irritate the respiratory sys-
tem.
4.1.1.3 Air Control Components - Check for proper adjust-
ment of the air control components. Make sure the
safety pressure switches are set correctly and are
functioning properly. Repair any air leaks as discovered.
4.1.2 Partial or complete disassembly is required to inspect
the following items:
4.1.2.1 Drum Diameter Wear - Check the O.D. of the drum
and compare to the values shown on Table 7. Minor
heat-checking may be removed by machining the
drum O.D. If the drum has been subjected to exces-
sive heat, the open end may flare out, giving the
impression that the drum has not worn. It is therefore
important to check the diameter at several locations
across the face.
TABLE 6
Friction Material Thickness
NARROW SERIES
Element Size
Min. Allowable
Lining
Thickness, inch
(mm)
Original Lining
Thickness, inch
(mm)
11.5VC500 thru
20VC600 0.15 (3.8) 0.33 (8.4)
24VC650 thru
28VC650 0.15 (3.8) 0.45 (11.4)
33VC650 thru
42VC650 0.28 (7.1) 0.58 (14.7)
WIDE SERIES
14VC1000 thru
20VC1000 0.15 (3.8) 0.33 (8.4)
24VC1000 thru
28VC1000 0.15 (3.8) 0.45 (11.4)
32VC1000 thru
42VC1200 0.38 (9.5) 0.58 (14.7)
46VC1200 thru
52VC1200 0.38 (9.5) 0.69 (17.5)
51VC1600 thru
76VC2000 0.30 (7.6) 0.67 (17.0)
20