INSTALLATION, USE AND MAINTENANCE
GBA-GBP-CBE-MBE SERIES
49
5 OPERATION AND USE OF THE JIB CRANE
5.1 Functions of the jib crane
5.1.1 Intended use - Expected use - Intended purpose
The jib cranes
, with manual/electric rotation - GRL series are created to locally handle goods inside a
plant, on a loading dock or along with operating stations.
Jib cranes
perform three operations:
•
they lift
the load vertically in space, via a hook on the lifting unit, generally composed of a manual or
electric chain hoist and using accessories suitable for this operation;
•
they traverse
the load in space, with the assistance of an electric or manual hoist holder trolley, which
runs along the radial axis of the crane arm;
•
they rotate
the load in space, around the constrained axis of the arm, through a manual push action
of the load using the circular area below, limited by the rotation radius of the arm.
If equipped with an
electric hoist
and push trolley
movements are activated:
•
from a pushbutton panel
with “lift and lower” buttons to control the
lifting
movement
•
by pushing
to control the
traverse
trolley.
If the crane is equipped with an
electric hoist
and electric traverse trolley
movements are activated:
•
from a pushbutton panel
with “lift and lower” buttons to control the
lifting
movement
•
from a pushbutton panel
with “right and left” buttons to control the
traverse
movement.
If the crane is equipped with a
manual hoist
and trolley
movements are activated:
•
by mechanical activation
of the hoist manoeuvre chain for the
lifting
movement.
•
by pushing
to control the
traverse
trolley.
The
arm rotation
movement is activated manually by
push P&T or electrically from the pushbutton
panel.
When the controls are from the pushbutton panel
, the buttons activate the function when they are
pressed and the slow auxiliary speed control for lifting and traverse, can be activated as follows:
•
with separate buttons
, independently activating the “slow” speeds from the “fast” ones.
•
with a single button
with two clicks, the first click to control the “slow” speed, the second click to
control the “fast” one
The
emergency stop
button, present on the pushbutton panel is mushroom shaped, red, and activates the
stop
function when pushed all the way down.
To allow crane operation the
emergency stop
button needs to be in the “lifted” position for start consensus
and then the
function buttons
need to be pressed.
The pushbutton panel is suspended from the hoist and can be operated by the operator on the ground,
following the traverse movement of the trolley and/or rotation of the arm.
The electrical movements of the jib crane can also be controlled by a remote-control system: the functions
of the buttons are unchanged compared to those related to the pushbutton panel.
