ORTON
make spring operated cable reeling drums are powered with springs and
has an automatic rewind feature which provides an extremely simple way
of supplying power to machines such as cranes and hoists. These spring cable reeling
drums are used for both AC and DC applications. These reels recovers and
store the cable in multiple layerson the drum.
Standard reels are supplied for the cable fed in the clockwise
direction, when viewed from the slipring side. The same can be provided
for anticlockwise feed of cable also. These reels are extremely simple
to mount, and can be mounted on the structure with the help of a
supporting flange - If no suitable structure is available, then a
bracket can be connected to the flange and this can be fixed to the
floor or tray etc.
The springs used in these reels are manufactured from the highest
quality materials and are of clock spring type. A wide range of
characteristics can be obtained by assembling these springs singly or in
series or in parallel.
All the power sliprings are designed for 600V AC operating voltage.
Spring operated cable reeling drums can also be supplied with geared
rotary limit Switch arrangement.
ORTON have a complete range of motor driven torque controller cable
reeling drums. The reels shown in this catalogue are direct reeling
units where the cable compartment is mounted directly on the torque
controller. For those applications where the length and weight of the
cable is in excess of the design capability of the direct reeling units,
we have the indirect driven torque controller reels. With these reels
the torque controller unit powers the reel compartment through a
suitably selected transmission system. These types of cable reels are a
reliable, low cost solution for reeling long lengths of cable. These
drums are available for a complete range of cable lengths from 30 to 500
meters, for voltage up to 11000 V. These spring operaded cable reeling drums are easily installed,
have an absolute minimum maintenance requirement and are virtually
unaffected by extremes of temperature and environment. These types of spring
cable reeling drums are available in 3 types viz monospiral, standard
lay and random lay.
Advantages
- Uses standard AC or DC motor as prime mover.
- This design reduces tensions in the reeled cable substantially as
against other form of drive.
- Lubricated for life gearbox. o Range of drive units to suit
various sizes and length of cable to be reeled.
- Reduced overall size as compared with conventional motor.
- No chain drives, hence reduced maintenance.
- Selected reel will cover wide range of cable length & sizes.
- No additional brake required
- Combinations of core sizes and quantities can be readily
accommodated, in standard size of housing.
Working
Principle
Torque controller type cable reel are driven by a substantially
constant speed motive power unit. In its standard form, the reel is
designed to be powered by a totally enclosed fan cooled electric motor.
The most popular choice is for motors working form a 3 phase supply but
single phase or DC motors may also be used provided they have
performance characteristic as in accordance with the torque controller
data.
The motive power unit drives the cable reel through an irreversible
worm an wheel transmission which is totally enclosed and lubricated for
life. The reduction ratio of this worm and wheel transmission is
normally 50:1 and the rotational speed of the transmission out put
spindle is adjusted by selection of the motive power speed. In all cases
the selected rotational speed of this output spindle is in excess of
that required for the cable reel.
The speed differential between the transmission output spindle and the
cable reel is accommodated by the torque controller using a friction pad
as the slipping interface.
The irreversible worm and wheel transmission and the stable torque
characteristics of the torque controller permit successful cable reeling
on the basis of energizing the motor for cable recovery. The benefits of
energizing the reel motor for cable recovery only, are increased lining
life and extended intervals between torque correction adjustments.
TC Payout Sensor Operation
The basic function of the payout sensor is to detect the rotation of
the reel ensuring that the reel motor is energised during cable recovery
and de-energised during cable payout. A limit switch is operated
byaswivelingarm which is rotated by means of a cam fitted to the reel
spindle. When the reel revolves in a payout condition the arm is moved
until it opens the contacts in the limit switch de-energising the reel
motor. In the reel-in condition the arm is rotated away from the limit
switch making the contacts energising the reel motor.
Since the payout sensor cannot anticipate the direction of rotation of
the reel under start conditions, the reel motor is always energised for
30 seconds by the incorporation of a timer in the control circuit which
by passes the payout sensor contacts. This timer allows sufficient time
for the sensor to detect whether the machine is moving towards the cable
anchor position or away from it so ensuring that the reel motor is
either energised or de-energised.
These
types of cable reefing drums are normally used for cables of size 4c x
25 sq mm (max) and cable lengths upto 20 mtrs. However these drums can
be used even upto 150 mtrs if the cable diameter is small
(say.4cx2.5sqmm).
In case of stall torque motorized cable reeling drum the stall torque
motor remains energized in both winding and unwinding operation of
cable. In case you want to save power during long stoppages of machine,
then a contractor and timer circuit can be installed in your panel.
However, this is only an optional feature and is not a mandatory
requirement. Since the stall torque motors are continuously rated, there
will be no problem even in the motor remains continuously oh during both
winding and unwinding direction.
These
types of cable reeling drums are used to avoid; tension on the cable.
However, a drive mechanism is required to drive the cable reeling, which
is not required in case of spring operated or motorised CRD's.
These types of cable reeling drums are recommended for single layer
winding of cables.
Applications
HORIZONTAL RECOVERY:
This arrangement can be used in two applications i.e., end and centre
feed. In the end feed type, the drum is mounted on the moving machine
and the reel recovers the cable laid on the ground. Here the machine
travel is equal to the capacity of the reel. In the centre feed type,
the machine travels on both sides of the fixed point, where a turnover
anchor is installed. This arrangement provides travel equal to twice the
capacity of the reel.
VERTICAL RECOVERY:
In this type also the reel is machine mounted and the biggest advantage
of this type is that it does not have to pull the weight of the cable
since, in this case the complete weight of the cable is felt at the
fixed point.
HORIZONTAL CATENARY:
In this type of arrangement. the cable is not laid on the ground but is
suspended in the air due to the tension of the spring.
VERTICAL PULL:
Here the reel is mounted on a fixed structure and has' to overcome the
weight of the hose. The length of travel is equivalent to the capacity
of the reel.
LIFTING
MAGNETS are extremely convenient and economical and find wide
application in handling different kinds of scrap such as pig-iron,
steel-turnings, ingots, slabs, cut pieces of plates, channels beams etc.
Lifting capacity of the magnet depends upon the size of magnet, power
rating, shape and size and typical bulk density of scrap material,
amount of the load in direct contact with pole-faces,
storage-distribution and piling of scrap, temp, of scrap material and
above all the skills of the crane-operator. To achieve optimum lifting
capacity and the overall efficiency of the magnet it is strongly
recommended that the magnet is allowed to properly rest on the scrap
before switching 'ON' the magnet. Lifting capacity of the magnet is
strongly influenced by air gaps between the loose pieces of scrap.
Therefore, the circular lifting magnets have larger diameter to overcome
the effect of air-gaps introduced by loose scrap. Lifting capacity is
also reduced drastically if the scrap material is highly porous or it
contains high percentage of carbon as the magnetic property reduces due
to high carbon content.
