MDA Technologies 3/2016

The lift and carry crane in detail
It is the Travellift’s job to pick up various workpieces, to lift them, transport and
position them. The Travellift lifts the item to be transported using two winches via a
crossbeam. The raised items can then be moved. Thanks to the arrangement and
variable maneuverability of the wheels, the items can be maneuvered and loaded in a
variety of ways.
The Travellift is hydraulically powered. The hydraulic energy is generated by a diesel
motor, which drives the hydraulic pumps. The Travellift’s chassis consists of four wheel
units with hydraulically powered gearboxes, which are each individually maneuverable.
To achieve the maximum degree of maneuverability when transporting workpieces,
the Travellift has five methods of steering which can be selected via the two steering
type selector switches, one installed in the driver’s cabin and one available using
radio-controlled remote access.
The continuous activation of the drive motor from 0 – 15 km/h is achieved thanks to
an electronic accelerator pedal and direction of travel switch. Steering is activated by
an electronic steering force simulator (steer-by-wire). There is, therefore, no direct
Simulation of the winch control
During project planning of the winch
control, safe holding of the winch was simulated
under real operating conditions.
Automation Studio, a simulation software
developed by Famic Technologies, was used
to simulate the hydraulics and electrical
systems.
In particular, the behavior of the brakelowering
valves that have been flanged on
the winches’ hydraulic motors was analyzed
under the following operational states:
n Stop of the winches by withdrawing the
control lever
n Stop by control outage = Emergency Stop
Category 1, no electric energy, diesel
engine still running
n Stop by outage of diesel engine = Emergency
Stop Category 0
The most critical operation state “the Emergency
Stop Category 0” will be explained in
detail in the following section.
mechanical connection between the steering wheel
and the wheels. The steering force simulator displays
the intended value for the angle of steering. A safety
angle display unit is built in the center point of each
wheel-bearing, which detects the actual value of the
steering axis.
The lift working area is divided into two lifting hoists
and two traveling trolleys, which are also hydraulically
powered. They are steered using a control lever
in the right hand seat console.
The hydraulic aggregate forms the central power
supply for energy supply and the steering unit for all
hydraulic and electronic users of the Travellift.
Designing the hydraulic aggregate involved the most
extensive work due to the complex, multiple
requirements for all of the functional demands,
including installation space regulations as well as
fuel emissions and noise regulations.
The Travellift was installed and commissioned under
the management and supervision of Grunau &
Schröder Maschinentechnik at Max Bögl. Following a
Features of Use
n Handles different shapes of
structural components
n High driver vehicle dynamics
n Speed of travel up to 13 km/h
fully loaded - 15 km/h empty
n Exact and direct steering
behavior
n Different types of steering for
maximum maneuverability
n Quick but also delicate and
precise control of the
functions
n Working capacity 16-20
hours/day
n High full throttle ratio (with 3
liters)
n Exhaust Emissions Guideline
Level 4 final
n Sound Pressure Level
Lp ≤ 80 db(A) at 5 meters
Removal because of neighboring
housing settlements
successful six-month test phase with two shifts working each day we are planning to
produce further pieces of equipment.
MDA Technologies 3/2016