OPERATING MANUAL. INDUSTRIAL SECTIONAL DOORS
4
PRODUCT DESCRIPTION
1.3
DOOR DESIGN
Doors consist of a bearing structure, door leaf, torsion shaft and springs, control elements. The
typical design of a door of standard mounting is shown in
fig
. 11.
The door bearing structure is an assembly of vertical angle bars with profile tracks and horizontal
profile tracks.
The door leaf is made from sections, connected with side roller brackets and intermediate hinges.
The sections are made of steel two-wall sandwich-panels with polyurethane foam filling the
inner space or aluminium frames with infill panels.
The door leaf movement is performed along the tracks on adjustable rollers made from wear-
resistant plastic fixed in roller supports of the side hinges.
The door leaf is hung on two steel cables fixed to bottom brackets with cable break protection.
The cables are wound on drums mounted on the torsion shaft.
Effort produced by the springs balances the weight of the door leaf and keeps cables constantly
tight.
Note:
If it’s not possible to produce the doors with a single shaft balancing system, the doors can
be supplied with a double shaft balancing system. The double shaft balancing system includes
two shaft blocks connected by two chain gears. Each shaft block includes two shafts with an
adjustable coupler, springs with fittings, brackets with spring break device.
Special set for sectional doors installed in damp premises, increases the corrosion resistance of
the product, but does not exclude rust stains. Opening / closing of the door leaf is performed
either manually or with the help of an electric motor.
Manual control can be performed with the help of handles fixed on the door leaf, by using a
rope or a chain hoist operated by chain (when chain hoist is ordered as an optional extra to a
standard set).
The following safety elements are used in the door construction:
•
bottom brackets with cable break protection (
pos
. 1
fig
. 11);
•
spring break devices (
pos
. 16
fig
. 11), which are activated when a spring is broken.
Doors with an electric drive can be equipped with the following protection and automation
elements:
•
micro switches, which switch off the electric motor in the case of spring break;
•
micro switches, which switch off the electric motor in the case of a cable break;
•
wicket sensor for blocking door opening in case when a wicket is not fully closed.
The opening of the wicket at an angle of more than 100 ° is not allowed.
For protection of door leaf bottom edge in case, in the process of closing, it touches any obstacle
optical sensors should be used. Optical sensors are activated at the moment when the door leaf
touches an obstacle. The sensors are installed in the bottom seal and by its deformation during
touching an obstacle this gives a signal for the electric motor control system to stop. After the
stop the motor lifts the door leaf a small distance and stops again. If there is no sensor or in case
of a fault in sensor door closing is possible in ‘presence of operator’ mode only, i.e. by holding
the corresponding button on the control panel pressed. For door leaf opening there is no need
to hold the corresponding button pressed.
The door locking is done by a spring locking bar or key lock. The key lock allows locking of the
doors both from inside and outside. The locking by a spring locking bar can be done only from
the inside of the premises.
