misia XM SERIES, Installation, Operation And Maintenance Manual

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ELECTRIC WIRE ROPE HOIST
XM SERIES
2. DESCRIPTION OF THE HOIST/TROLLEY
Hoisting motor, self-braking and conical
Three-phase asynchronous 1 or 2 speed electric motor
with cone rotor and integrated cone brake driven by a
coil spring. The brake is released due to axial sliding of
the rotor after power is switched on.
Hoisting and travel motor, self-braking
and cylindrical
Three-phase asynchronous, 1 or 2 speed electric
motor with cylindrical rotor, with a DC brake. The
single polarity motor can be inverter driven to obtain
the slow speed required as well as the acceleration or
deceleration ramps.
Coupling
The torque of the motor is transmitted to the shaft of
the gearbox by a toothed coupling connected to the
gearbox shaft.
Planetary gear
The two or three stage planetary gear reduces the
rotation speed of the electric motor to the number of
rotations necessary for the drum.
All gears on the gearbox are in heat treated high quality
steel.
Drum
The drum is driven centrally by the hollow output
shaft on the gearbox. The shaft on the gearbox and
the guide plate on the second stage are supported
on roller bearings on which the drum is installed. For
hoists Type 740-750-950-963-980-1100-1125 the
gearbox is located inside the drum.
The profile of the rope grooves on the drum are
manufactured in compliance with DIN standards.
Rope guide
The rope guide is essentially composed of two parts: a
guide ring and a pressure ring that properly guide the
rope on the drum grooves. The guide ring maintains
the rope in position during uncoiling, preventing it
coming off the groove and, when the load swings, is
guided by a fixed bar and runs on a roller bearing.
Hoist body
The supporting framework is composed of a compact
welded structure made of two steel flanges joined by
profiled plates.
Block with hook
The structure of the block with the 2 or 4 rope falls
allows distribution of the tensile force generated from
the ropes load. The side covers of the block covering
the pulleys are strong and shock resistant.
Load limiter
All the hoists in the "XM" Series with 2 and 4 rope falls
are systematically equipped with a load limiter.
The load limiters intervene on the auxiliary circuit
by signalling the maximum nominal load and, in the
event of overcharging, stops the ascent operation and
movement.
A Electronic device with dynamometric pin with
relevant pre-calibrated board, with two intervention
thresholds;
B Electromechanical device with pre-calibrated
spring, with two intervention thresholds.
Electrical system
The hoist trolley, where required, can be provided with it
own electrical system which includes: electromagnetic
switches to control all hoist movement, as well the
protection fuses against short circuit. The control
circuits are low voltage (48/110 volts). A terminal box
with numbered terminals ensures simplicity and safety
in the wiring for all external functions.