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Side shift on RAM all-electric yard crane spreader based on the design of its split-headblock tion of spreader or spreaders and
with four cylinders. While initially devel- headblock will depend on the design of
crane has a direct drive that can achieve oped for straddle carriers it is also suit- the crane supplied by the crane manu-
inching control. able for yard cranes. “It is more complex facturer.
Moving the whole crane “is quite to control, but marvellous to manage (fast For CTA in Hamburg, Bromma
negative for the life time of the crane and accurate) for the crane driver,” said worked together with ABB and Hans
drives; also because of the mass of the Kees Stinis. Künz, putting its spreader communica-
crane, you needs a lot of energy and the tions and control technology on the Künz
speeds are slow,” said Stinis. Reliability headblock, in order to operate micro-
One difficulty with chains is that they Automated stacking cranes require a fine- motion on the headblock with the ABB
are classified as “lifting equipment” and positioning or micro-motion system and control system.
there are well-established safety proce- these vary greatly between projects. RAM Olofqvist adds that as far as automa-
dures for periodic testing of lifting chains has supplied several systems and says that tion and yard spreaders are concerned
in most jurisdictions. By contrast sliding in some cases the spreaders are supplied reliability, intelligence, position detection
systems are normally deemed part of the complete with cameras and other posi- and the remote control system are actu-
spreader hangs from chains and is adjusted straddle carriers use a combination of spreader structure for which there are no tioning equipment, while in others the ally the four most important demands.
by cylinders (two for the cross motion, both a sliding mechanism and chains. In- generally accepted tests. spreader is supplied with an integrated Bromma has continuously addressed re-
one for the gantry travel direction) be- cidentally Stinis considers a spreader- headblock which can contain the micro- liability with the diagnostics systems
cause of its lighter weight. based system is a better option than using New system motion system for fine positioning of the launched with the SCS2 and then the
Kees Stinis notes that the latest Noell the crane’s drive system even where the Stinis is now developing a new system spreader. In all cases this final configura- “prognostics” added with SCS3 commu-
nication system to give advance warning
of problems by motor speeds and forces
in key components.
With regard to intelligence, yard
spreaders typically use an inductive sen-
sor to signal “out of position,” but for
automated applications Bromma has used
an absolute sensor with a lower tolerance
and a control system that can make very
fast, precise adjustments.
Auckland midlocks
Ports of Auckland Ltd (POAL) in New
Zealand has come up with its own solu-
tion for a completely different issue -
safely using twinlift spreaders with
midlocked containers.
Midlocks, or automated fixing cones
(AFCs) are used on the middle corner
castings of 20ft containers in a 40ft slot
and feature a twistlock to connect to the
upper container and a “hook” to connect
into the lower container. They can also
be used upside down to secure boxes to
hatch covers.
They are designed to resist lateral and
separating forces and to disengage the
hook element when the other end of the
container is lifted, but only when single-
lifted. Experienced crane drivers can dis-
charge midlocked containers in twinlift
mode by inching the hoist, lowering and
hoisting again if they “feel” that the con-
tainers are still connected to each other.
POAL had found that “while it is pos-
sible for a skilled crane driver to twin-
discharge containers with midlocks, it was
not reliable.” Early last year it commenced
development of a “semi-automatic
method to twin-discharge with midlocks”
and is now using it on three cranes at its
Axis Fergusson terminal with plans to
commission systems on the other two
early this year.
POAL is keeping quiet on the details
of its system, but it involves a “midlock”
function that the crane driver can select.
Locally-developed software manipulates
the spreader telescoping system when the
spreader twistlocks are engaged to open
a small gap between the 20ft containers,
just wide enough for the hook mecha-
nism on the midlock to slide clear of the
corner castings, ensuring an unsafe hoist-
ing move is avoided.
With this system, POAL has found it
can “precisely and reliably twin-dis-
charge,” said operations engineer John
Miller. The percentage of 20ft containers
in New Zealand trades is significantly
higher than average, so more effective
twinlift operations have a significant im-
pact on terminal productivity. ❏
Better in 2010?
2009 was a tough year, but there were
some encouraging signs in the last few
months. Bromma reports that while many
new terminal projects are on hold, the
replacemenet business is “steadier.”
Bromma sold 25 RTG and four
Bromma GreenLine™ spreaders offer terminals ship- Eliminating hydraulics reduces spreader power con- With no fluids to change, and no filters to replace,
STS45 spreaders to GPA Savannah last
to-shore and yard solutions that are lighter, more sumption by an estimated 85%. For every 5 kWh GreenLine™ means reduced maintenance, a sav-
year and now has 100 spreaders in serv-
energ y- ef fic ient, simpler to op er ate, and more reliable. consumed by an STS45, less than 1 kWh is consumed ings Bromma estimates at more than $2,000 USD
ice in the port. The company reports con-
GreenLine™ all-electric spreaders reduce power con- by an STS45E. This represents annual savings of more per year. Quiet, ideal for automated terminals, and
sumption in two ways. Reduced spreader weight low- than $1,100/year per spreader. What are combined energy efficient, GreenLine™ spreaders are the right
tinuing momentum for all-electric sepa-
ers STS crane power consumption by an estimated crane and spreader fleet savings? For a 10-spreader products for the right time, and they are only avail-
rating centre twin 20 STS spreaders and
$4,000 USD/year per crane. fleet, more than $50,000 USD per year. able from Bromma. has now sold more thn 40 units, includ-
ing a recent sale of five to the Port of
Greenline™. environmental leadership.
Itapoá in Brazil.
Only from Bromma.
“Greenline” all-electric yard spreader
sales are also going well, not least in Af-
rica. Recent orders for more than 70 units
included 10 for KPA Mombasa, eight for
Namports, eight for Damietta and seven
for a Lagos operator. ❏
32 February 2010
32_pos36_WCN_Feb.indd 1 04/03/2010 15:38:30
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