Self Blocking Rail Clamps
Overview:
These rail clamps are storm brakes suitable for high
forces: from 100 to 2000 kN.
The self-blocking rail clamp even in working position starts
really to work, pressing the rail sides, only if the wind force
overcomes the gantry brakes capacity. When this happens and the
crane tends to move, the rail clamps pressing on the rail sides
with a force proportional to the wind force deducted the gantry
brakes force..
The capacity values indicated in the catalogue are calculated with
friction coeff. of 0,25 or 0,45 between breaking shoes and rail,
since the real coeff. is much higher (approx. 0,59 - certified by
TUV German register), the rail clamps have High safety factor.
Main advantages:
Light Maintenance
Breaking shoes are practically for the whole life, thanks to the
self-blocking working principle (working only when wind force
overcomes the gantry brakes capacity, with a force proportional
to the wind force deducted the gantry brakes force). Jaws duration
is very long (our experience is that jaws last is not less than
10 years, in some cases they have been changed after 25 years of
life) minimising maintenance needs. Particular suitability to high
speed cranes thanks to the free movement: the wide gap (seldom contacts)
between guides and rails allows a long duration of guides.
Efficiency
The holding force does not decrease in the years, thanks to the
self-blocking working principle. The wear of shoes is negligible
and in any case does not affect on the holding force. Independence
of the holding force from the fatigue deriving from heavy duty cycle
(the absence of springs renders this device suitable to the continuous
open/close applications). Fast opening with law power: opening is
made just rising up the light weight of the calliper (not working
against strong springs and wasting energy).
High tolerance:
The automatic system allows very big variation of rail width
(on request, up to 8 mm). Vertical allowance of the position respect
the rail of ± 12 mm is big enough to permit a fixed installation
also in the middle of the seal beam (no wheels are needed).
Easy installation:
Any type of installation is possible, without need of "on trolley"
realisation that requires further maintenance.
Rail preservation:
End user will take advantage from the negligible effects of wear,
due to the automatic blocking working principle
Options:
Customised realisations are available like integration of stowage
pins in the clamp case frame, top flange, etc.
Electric board are available
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