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Machine Building Systems now offers specially designed
products to facilitate the construction of such
equipment using the tried-and-tested Item MB Building
Kit System. Lifting Doors with widths of up to 2m and a
weight of up to 35kg can be accommodated in the new
guide profiles. The door itself is guided by means of
specially designed bearings which use tensioned-spring
rollers to compensate for tolerances and heat expansion,
and prevent jamming or canting of the door frame in the
guides. The ball-bearing mounted rollers are
spray-coated with a noise-reducing plastic surface to
ensure very quiet, low-friction running and long
durability. The Lifting Door can be powered or opened
manually, and the force required to raise it is
remarkably low thanks to the sophisticated counterweight
mechanism. The guided counterweights are linked to the
Lifting Door by chains which run in completely covered
ducts – which prevents injury to hands from moving
components.
Counterbalanced lifting doors are frequently found in
applications with cycle times as low as a few seconds,
making millions of operations per year a very real
possibility. This leads to wear and tear that can - and
has -resulted in a very unwelcome event: that of sudden
and unpredictable failure of the counterweight linkage
system causing the door to drop uncontrollably. For this
reason, Item has included a major safety feature in this
new system. The door can be equipped with a gravity
brake on both sides. In the unlikely event of a chain
failing, this simple and effective spring-loaded
eccentric brake system will trigger, instantly locking
the door frame in its guides and preventing the door
moving downwards.
And since the components are made by item, it goes
without saying that all the components making up the new
Lifting Door System are fully integrated in the modular
MB Building Kit System. The Guide Profiles have line 8
system grooves on the outer sides which enables the door
to be easily connected to other guard components. The
grooves also provide universal fitting opportunities for
any attachments such as other safety elements. |
