Lifting of the shutter - motion
The roll is coiled in perforated metal tube with a diameter
depending on its weight and dimensions. The metallic tube henceforce
will be
called shaft of the shutter. At the ends of the shaft, with
the help of two metal discs, torsion beams St 75 are
concentric and internally welded, hereinafter referred as
axle shafts of the roller shutter, with diameters depending
on the size of the roller shutter.
The roller shutter is based on special pillow blocks screwed
at the side hoods of the sheet, which are protective hoods
of the roller shutter; so that the pillow blocks are within
the shaft and the axle shafts passes through the hoods via
special holes.
This way of support outclasses others because it excludes
the fall of the shutter in all cases: namely displacement of
the shaft, fracture of the axle shaft or fracture of the
pillow block. Since the displacement of the axis is
impossible, we have superior and more stable operation.
The protective outer hoods of the
shutter
offer:
1.
Together with the welded reinforcements which they have,
they offer excellent
support
base with allowable oscillation completely harmless for the
rigidness of the device
and
useful to absorb vibration.
-
Serve as guides for the proper coiling of the roller
shutter and prevent damage of the safety plastic plugs
that the roller shutter bears at the edges. That is
because the roller shutter during the coiling can not be
moved out of the drivers.
-
Separate the roller shutter from the chain sprocket and
the chain hoist which transmits the motion and
furthermore from the centrifugal accelerator, thus
protecting not only the roller shutter but the rest of
components as well.
The transmission is done with:
a heavy duty chain sprocket and chain pulleys with
transmission ratio 1/3. The motion is supplied by
three-phase motor with irreversible reducer, which has
integrated interrupters for the stopping of the roller
shutter at the terminal positions and manually operated
system with a starting handle or chain hoist.
The control of the motor is done:
From the electrical board with the use of a control system
for monitoring asymmetry and succession phases.
The control is done with button or key-switcher and there is
possibility to easily connect in the board a remote receiver
and photocells. The control buttons operate with low voltage
24 V for safety of personnel.
Protection by the
accelerator
The shaft of the roller shutter is based on two pillow
blocks along with the axle shafts. The motion of the
shaft is applied on the one axle shaft
as we have already described above. The other axle shaft is
based on a special pillow block, called centrifugal
accelerator. It is also oscillated because it is based on
the respective protective cheek with three flexible joints.
The device is activated when the angular acceleration of the
shaft exceeds the permissible limit, without allowing it to
develop large angular momentum during the descent of the
roller shutter.
So we have protection in the fall, because apart from the
early halt of the roller shutter during the descent, we also
have power interruption of any electrical operation in the
roller shutter.
The possible causes of the sudden drop of the shutter are:
-
fracture
of the sprocket
-
fracture
of the reducer
-
internal fracture of
cogs
or gears of the reducer
-
fracture of the base
of the reducer
or the axle shaft.
Advantages of the transmission with sprocket in regard to
the direct transmission:
-
We have space economy because the loss of space is only
6
cm on either sides of the opening of the shutter.
-
We have protection of the reducer from high torque.
-
We have damping of vibration on the bearings of the
reducer.
-
The increase of lifetime of the device is much more than
the existing decrease with a triple ratio. It outcomes
more than five times the lifetime of the available
devices.
-
We use materials suitable for industry
-
The only disadvantage is the higher cost.
Drivers of the
roller
shutter
The driver of the roller shutter consists of the support
beam-hollow-beam- and the driver of the roller
shutter-channel- manufactured from formed sheet steel
2,5
mm welded with specific nerves at certain distances. In the
same device the support base of the roller shutter is
welded, making it self-supported, which is an important
advantage in terms of security and makes the installation
easy and quick.
At the edge of the driver there are aluminium rims with
double brushes giving to the driver the following
advantages:
-
Better insulation of the roller shutter to the driver.
-
Less noise during the movement.
-
High aesthetics throughout the device.
-
The air encaged at the fibres of the brush, operates as
a lubricant and the roller shutter operates with less
friction and without wearing away the paint.
Advantages of the New Generation Industrial Roller Shutters
-
We have a rigid construction.
-
We have self-supported construction in our columns which
guarantees quick and easy installation.
-
We have reduced the loss of space in either side of the
roller shutter offering high aesthetics.
-
We have good insulation and safe operation of the
construction.
-
Is it possible to dismantle the construction and
transport it in another area with very little process
and low cost without damaging the device.
The
roller shutters
are
suitable:
-
For the industry, for continuous use where high
standards and strength are required, and also for the
coverage of large exposures.
-
For
military installations.
Description
of manual operation
In this brief technical description, we describe the
manually operation with the handle and the chain hoist
system.
Further information is as follows:
In the case of power supply interruption or possible
electrical troubleshooting of the board or the motor, put
quite simply the handle to the special axis and rotate
either left or right if you want to move up or down the
door. If there is power supply in the device, by placing the
handle the indicator light turns off, leading to stop any
electrical activity in the control panel for security
reasons. With minimal rotation the handle automatically
attaches to the holder and stands without annoying the
operator with its weight. The disengagement of the motor and
the position in manual operation is completely automatic and
does not require any special mechanism. At any location if
we want to stop the roller shutter we simply stop the manual
operation and it simple stays at this position. Then rotate
the handle slightly at the opposite direction, so is
releases and remove it from the holder. The indicator light
illuminates, if there is any electrical power supply and
turns on any electrical operation controlled by the central
board. The roller shutter is ready to operate electrically
again.
The manual operation device is specially designed for
military installations, for the following reasons:
-
It ensures ergonomic and comfort use.
-
Very high torque transfer without stressing the device
thus offering unlimited lifetime.
-
In contrast to the permanent devices e.g. chains, where
the burglar may enter the area and operate manually the
device, if he uses the chains that are permanently
installed, this device is controllable since the handles
are stored by the operators.
-
The clevis of the handle is not available on the market
and it is very difficult to obtain any. But it is very
cheap tool when we supply it.
Manually
operation
with chain
It this method the roller shutter is moving much more
quickly.
The manual operation is achieved through a
worm chain that
rotates a system of pulleys-chain hoist. This system is
operating automatically when you pull the chain and
moves the roller shutter but at the same time every
electrical activity is stopped. The system automatically
reverts to electric mode when we simply let the chain
and the indicator is lighted. Maximum capacity of
elevation 5 tones.
The only disadvantage of this manually mode, is that
there is access by anyone to open the roller shutter
without any control.
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