As the latest technology is based on
AC drives with highly efficient
converters, it is possible to even further
optimise friction winders by using an
inverted motor built into the winder
drum. Ahigh rigidity supports an
optimised motor design, while a compact
solution offers several benefits to
foundation and hoisting tower
construction.
“At present, we are manufacturing the
largest machines of this type for the
Hongqinghe mine of Yitai Group in
Inner Mongolia, China,” said
Klaus Hofmann, Executive Vice
President, Engineering and Project
Management at Siemag Tecberg said.
“The greatest challenge is the two
production shaft Koepe-winders with
5 m dia. drums and integrated 9 MW
drives designed for operating six 52 mm
dia. ropes each. Furthermore, the scope of
work includes corresponding deflection
sheaves, the loading systems
underground, the unloading systems on
the surface, and the two 50 t skips each to
hoist the coal with travel speed of
15.2 m/sec.”
Siemag Tecberg is also installing a
hoisting system for the Hongqinghe
service shaft. The hoist will use a 5.6 m
dia. drum and six 58 mm dia. ropes to
operate a 12 m high cage with two
4 x 9 m decks. The object is to minimise
the disassembly of the mining
equipment; the decks are large enough to
accommodate wagons carrying e.g. large
hydraulic roof supports for longwall
mining. Most of the shaft profile is used
to accommodate the large cage, designed
for a 60 t payload on the bottom deck and
a large counterweight arranged on the
side of the shaft.
At a depth of 800 m, the head ropes
elongate about 500 – 600 mmwhen
receiving a 60 t payload. This requires
that the cage be held in position during
the respective loading or unloading
processes. This is achieved by a proven
‘cage locking system’, which is a fast,
reliable and very safe device that makes
sure the ropes take over the payload very
smoothly by short controlled creeping of
the winder until the locks are released.
“It is expected, that Hongqinghe coal
mine with an output capacity of
15 million tpy will be the largest vertical
shaft hoist for coal in China,” said
Torsten Scholl, General Manager of
Tianjin Siemag Tecberg Machinery Co.
Ltd (TST), China.
“In the coal industry, revamping and
upgrades are the current focus for
customers as they aim to stretch the
production at existing facilities. Safety
regulations and related equipment are
also becoming more and more important
for the Chinese mining industry,” Scholl
continued. “As a result of extending their
underground network, there will be a
need of higher ventilation and cooling
capacities. With the patented Pressure
Exchange System (PES) for underground
air conditioning with centralised water
cooling systems, Siemag Tecberg has
solutions for providing the most efficient
systems to the cooling problem.”
Apart fromChina, the company also
has been successful in Poland in
promoting the PES system, since it was
originally introduced in German coal
mines. Using chilled water, the PES
combines the high pressure caused by the
column of water from surface with the
lower pressures needed by the
underground distribution system, and is
able to recover energy dealing with
cooling capacities of 20 MW and above.
All installations are performing well and
are demonstrating the concept’s
efficiency and reliability.
“We have successfully provided a
new double skip hoisting system to
Przedsiębiorstwo Górnicze ‘Silesia’ for
an existing shaft, which was largely
reconditioned and reinforced,” said
Marzena Gajda, Managing Director of
Siemag Tecberg Polska Sp. z o. o. “Partly
using the original installation, the
transport facilities are all new. Starting
with the loading system, the shaft
equipment, unloading station, belt
conveyors, skips, ropes and attachments,
as well as the winder, have been
replaced. Siemag Safety Arrestors have
been introduced for retarding the
Hongqinghe main shaft project.
Hongqinghe service shaft project.
56
|
World Coal
|
July 2015
