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Separate direct current drive of hoisting mechanisms,
crowd, swing and motion with thyristor converters
supply allowed to avoid usage of machine converters,
facilitates control of working motions. Roller disk with conical rollers, centered relative to
central journal, provides reliable operation of swing gear
at large side loads. The excavator is fitted with four-motor,
four- gear unit swing mechanism. The driving gear of reduction unit is installed on
separate bearings and connected to the motor shaft
with the gear clutch. One of the gear wheels is fitted
with spring buffer, releasing dynamic loads applied to
the mechanism. Absence of cantilever wheels and gears provides
durability of gear drives. The machine is fitted with
boom of rigid box structure with pulley suspension and
double-grooved head blocks. The excavator is fitted with cable reel, the drive of
which is synchronized with motion mechnism. That provides
automatic reeling and unreeling of power cable
following cab displacements.
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EKG-20A is specially designed for usage in extreme
mining-geological and climatic conditions, that
reflected in its general arrangement, structural solutions
of separate units, in applied materials, availability
of special systems and devices, providing reliable
machine operation at the ambient temperatures up
to minus 50°C. The excavator is equipped with two cabins. The
upper serves for excavator control. Such location of
cab, its glass cover, powerful searchlights provide
good lookout of the face and transport facilities in any
season and day time. The cabin is equipped with an air-conditioner,
glass heating system and measuring station of excavator
working parameters. The lower cabin is for operator’s
relaxation. Both cabins have reliable sound
and heat insulation and electric heating. Filter ventilating installation supplies filtered air
into machinery house. It favorably affects durability
of the electric and electronic equipment, and also excavator
mechanical units.
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