31
Eylül
2013
international
construction
Türkiye
İNŞAAT MAKİNELERİ
Verimlilik arayışı
Kobelco şirketi,
CNH ile yürüttüğü
girişim ortaklığını
geçtiğimiz yıl
sonunda bitirdikten
sonra, artık
dünyanın her yerinde
kendi ekskavatörlerini
serbestçe satabiliyor
ve Avrupa ile Kuzey
Amerika’da bayilik
ağları oluşturuyor
Bosch Rexroth’s new Virtual Bleed Off (VBO)
system for example, is designed to provide just
the right amount of hydraulic flow to a hydraulic
circuit.
Not only does this save fuel, but the company
said it also makes for more comfortable
operation and faster response.
Doosan has already adopted VBO for its
DX340LC-3 and DX380LC-3 Stage IIIB
compliant crawler excavators, where it is
branded as D-Ecopower technology. A 26%
improvement in productivity and up to 12% in
fuel savings is being claimed for the electronic
pressure-controlled pump and closed centre
hydraulic system, depending on the mode
selected.
Turkish manufacturer Hidromek has added a
prototype 53.2 tonne excavator to its offering,
designated the HMK 540 LC HD. The machine
has been designed to operate on demanding
sites such as large-scale construction projects
and quarries.
Standard equipment includes a 3 m
3
bucket
with a breakout force of 29,900 kgf (293 kN).
The maximum digging depth is 7.1 m and the
maximum digging reach is 11 m at ground level.
Components include an Isuzu AH – 6UZ1X
diesel engine and Kaawasaki hydraulic pump
that offers an automatic boost function,
resulting in increased lifting capabilities, lower
cycle times and higher breakout forces.
The cab is Hydromek’s Gen Series, which is
pressurised to prevent the ingress of dust and
dirt. A rear-facing camera is standard and other
features include Opera Control System, a fully
automatic climate control
Hybrid future?
Although it is early days now, hybrid technology
looks to have a place in the excavator designs
of the future. Clearly there are competing
technologies, and the market will decide which
is best. It may be that different technologies
work better in different applications.
As a final note on the hybrid question, Liebherr
exhibited an interesting concept machine at
bauma incorporating numerous systems into a
40 tonne package. The R 9XX concept crawler
features both electrical and hydraulic systems
to capture and store waste energy, and Liebherr
says that this would make a 160 kW diesel
engine viable, whereas a standard power unit
for a 40 tonne machine would normally be well
over 200 kW.
As well as capturing slew brake energy, Liebherr
has devised a system to grab waste energy used
to lower the boom and stick.
Hybrids will become more attractive options
if fuel prices go up because fuel efficiency will
become a bigger part of the equation when
it comes to working out the whole-life cost
of a machine, and Liebherr’s concept R 9XX
demonstrates that there are more areas on an
excavator where waste energy can be caught
and re-used.
As hybrids become more and more available, it
is always going to be a wise move to weigh up
the increase in purchase cost against the fuel
savings that can be achieved to work out how
soon the pay-back will come (if at all).
ICT
ICT
Farklı koşullarda farklı teknolojiler daha iyi sonuç
sunabilir.
Melez tahrik konusunda son bir not olarak,
Liebherr firmasının da Bauma’da ilginç bir tasarım
sergilediğini belirtelim. 40 tonluk R 9XX paletli
ekskavatörü, atık enerjinin geri kazanılması ve
depolanmasını elektrikli ve hidrolik sistemleri bir
arada kullanıyor. Liebherr, normalde böyle bir
makine için 200 kW’ın hayli üzerinde bir dizel
motora ihtiyaç varken, bu sistemler sayesinde 160
kW’lık motorun yeterli geleceğini belirtiyor.
Liebherr tasarımcıları, dönüş sistemindeki
frenleme enerjisine ek olarak, bom ve kova
kolunun alçalması sırasında açığa çıkan enerjiyi
de geri kazanma yoluna gitmişler.
Yakıt fiyatlarındaki artış sürerse, makinelerin
toplam maliyetinde yakıt giderlerinin payı
giderek artacağından, melez tahrik sistemleri
de daha çekici hale gelecektir. Liebherr’in R
9XX modeli ise, ekskavatörlerde bu alanda hâlâ
önemli gelişme olanaklarının bulunduğunu
göstermekte.
