EATON HEVC 5005
Installation, Operation and Maintenance Manual E-CLCL-CC002-E2
May 2017
5
1.0 Introduction
Throughout this manual there are a number of
HAZARD Warnings that must be read and adhered
to in order to prevent possible personal injury and/
or damage 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
Danger
Denotes the most serious hazard, and is used
when serious injury or death WILL result from
misuse or failure to follow specific instructions.
Warning
Used when serious injury or death MAY
result
from misuse or failure to follow
specific instructions.
Caution
Used when injury or product/ equipment
damage may result from misuse or failure to
follow 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 Danger, the
Warning and the Caution procedures by which
hazards are to be avoided.
1.1 Description
1.1.1
The Airflex
®
air-actuated HEVC 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. Constricting action and ventilated
construction make high torque capacity and
rapid heat dissipation possible.
1.1.2
All Airflex HEVC elements are supplied with long
wearing, sintered friction material.
1.1.3
Airflex element assemblies are available for drum
diameters from 28, 51, 60, 66 and 76 inches.
Refer Table 1 for Nominal drum diameter and friction
material width
1.1.4
All HEVC sizes are supplied as Dual units only.
HEVC 5005
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 component. 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 friction material, where the torque
is transmitted through the friction couple to the
components mounted on the driven shaft (clutch
drum and drum mounting component). 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 practical 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.
1.2.1.2 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.
Only qualified personnel should install, adjust or
repair these units. Faulty workmanship will result in
exposure to hazardous conditions or personal injury.
Caution
Do not inflate the element without having a drum in
place. Inflation of the element without a drum
in place will result in permanent damage to the
Table 1
Nominal drum diameter and friction material width
Element size
Drum diameter inch (mm)
Friction material
width inch (mm)
28HEVC1000
28.20 (716)
9.96 (253)
51HEVC1600
51.56 (1309)
16.11 (409)
60HEVC1600
60.56 (1538)
16.11 (409)
66HEVC1600
66.56 (1691)
16.11 (409)
76HEVC1600
76.56 (1945)
16.11 (409)
76HEVC2000
76.56 (1945)
20.16 (512)
