Maritime cranes for the wind industry
Liebherr also offers the right solution for the wide range of requirements of the wind power industry in the maritime sector. Cranes and material handling equipment are employed both at harbors and at sea, on crane ships and on floating installation platforms.
The wide range of mobile harbor cranes and ship cranes from Liebherr ideally matches the many different requirements when loading wind power components in harbors. The cranes are used to load and unload ships, low-loaders and goods wagons. This involves heavy cargo such as generators with a lifting capacity of over 70 tonnes or rotor blades with a span of more than 40m. Safety and precision are important factors. In addition to the design of the cranes, the electronic control systems are of utmost importance. These control systems one of the core competencies of Liebherr and are therefore also developed in-house..
Liebherr also offers convincing solutions for constructing wind turbines at sea. The offshore heavy duty cranes feature lifting capacities of up to 3,000 t.
Loading of wind power components at the harbor
Safety and precision are the most important criteria when it comes to transferring heavy loads in the wind power sector. The strengths of the Liebherr mobile harbor cranes are brought to bear here. Independently powered, closed hydraulic circuits employ a minimum of components and combine extremely short reaction times and maximum precision with operating reliability and safety.
The mobile harbor cranes reach maximum lifting capacities of up to 208t. In tandem operation, the patented multi-crane control system SYCRATRONIC® enables lifting capacities of up to 416t. The dynamic anti-collision control system in conjunction with Vertical Line Finder also ensures that work is carried out safely and precisely.
Heavy-duty ship cranes for transportation and loading
Liebherr supplies the CBB series, a separate line of heavy-duty ship cranes, to load and transport wind turbines. These cranes can also be equipped with the dynamic anti-collision control system for enhanced safety in crane operation. The cranes can lift loads of up to 450t.
Erection of offshore wind turbines
Liebherr's offshore heavy duty cranes feature lifting capacities of up to 5,000t and are used to erect wind turbines at sea. All requirements can be catered for: diesel-powered or electric drive units, explosion-protected cranes and cranes for ambient temperatures between +40°C and -50°C, and special lowering depths down to 3,000m below sea level.
Synchronous control for automated tandem lifts
In standard mode, each crane has to be operated by one driver for tandem lifts. The drivers are informed about the main functions of both cranes (e.g. speeds, etc.) on their respective monitors. This enables both crane drivers to control the two cranes independently, but yet coordinated.
A far more efficient variant is the "Automatic Parallel" mode with one person controlling both cranes. In this mode, the traverse remains parallel to the ship or to the initial position, and an automatic control system computes the movements of the jib heads of both cranes. Since the length and hook height difference are kept constant during movement, any unwanted diagonal pull in the cables can be ruled out.
A third option for tandem lifts is the "Automatic Rotation" mode in which the traverse can rotate. The crane driver only has to control the direction or rotation of the traverse, while the control system computes the necessary movement of the jib heads of both cranes.
Dynamic anti-collision control
The dynamic anti-collision control system manages simultaneous movements of two or more cranes. Every crane is fully protected while its performance remains constantly high.
When several cranes work simultaneously, the movements of the individual crane can be controlled based on the current position of the other cranes. The special feature of the dynamic anti-collision system from Liebherr is that it automatically computes the actual position, speed and acceleration of each crane, as well as their load torque limitation. This allows the crane driver to work absolutely safely with maximum flexibility.
Vertical line finder prevents load vibrations
The vertical line finder is an optional control aid for avoiding diagonal pull on the load. This may occur when the distance between the crane driver and the load is too long or when the center of gravity is not symmetrical.
The control system controls the position of the boom by showing the exact vertical rope position before the load is lifted. Since the load does not vibrate, the danger of damage to the load or the crane is minimized. The system also provides greater safety for the crane driver and his environment.
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Liebherr-Werk Nenzing GmbH
Dr. Hans Liebherr Straße 1
6710 Nenzing
Austria
- Phone+43 50809 41-0
- Fax+43 50809 41-500
Efficiency for wind farms and individual installations
The economical, high-performance mobile cranes from Liebherr have proved their worth for decades in the construction of wind power plants. The cranes are available in various load capacity classes and are precisely tailored to the needs of the wind power industry. Liebherr faces the development of increasingly powerful installations and increasingly high towers by producing optimised cranes and new boom systems reaching especially high carrying capacities.
Telescopic mobile cranes (LTM) drive on public roads and can therefore be transported extremely economically. They can be quickly erected and only require very little space in this case. The telescopic mobile cranes move from site to site with a retracted telescopic boom on narrow roads at wind parks.
The basic unit of the lattice boom mobile cranes (LG) also moves on public roads. This reduces the number of transportation units compared with lattice boom crawler cranes. The lattice boom mobile crane is used during the erection of wind parks and single installations.
Picture gallery
Telescopic Mobile Crane LTM 11200-9.1
Lattice Boom Mobile Crane LG 1750
Telescopic Mobile Crane LTM 1750-9.1
Telescopic Mobile Crane LTM 11200-9.1
Telescopic Mobile Crane LTM 1350-6.1
Telescopic Mobile Crane LTM 1400-7.1
Telescopic Mobile Crane LTM 1400-7.1
Telescopic Mobile Crane LTM 1500-8.1
Telescopic Mobile Crane LTM 1750-9.1
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Contact
Liebherr-Werk Ehingen GmbH
Dr.-Hans-Liebherr-Straße 1
89584 Ehingen
Germany
- Phone+49 7391 502-0
- Fax+49 7391 502-3399
Peak technology for high load capacities
Crawler cranes from Liebherr have proved their worth for decades in the construction of wind power plants. The cranes are available in various load capacity classes and are precisely tailored to the needs of the wind power industry.
Lattice boom crawler cranes (LR series) offer the highest load capacity and lifting height. On suitable terrain they can drive with complete equipment on wide tracks from one wind power plant to another. They can also drive with a full load.
The narrow track lattice boom crawler cranes (LR-W) can move with long boom systems on narrow roads. They can therefore be used efficiently in wind parks.
Lattice Boom Crawler Crane LR 11350
Lattice Boom Crawler Crane LR 1600/2
Lattice Boom Crawler Crane LR 1600/2
Narrow Track Lattice Boom Crawler Crane LR 1600/2-W
Narrow Track Lattice Boom Crawler Crane LR 1600/2-W
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Liebherr-Werk Ehingen GmbH
Dr.-Hans-Liebherr-Straße 1
89584 Ehingen
Germany
- Phone+49 7391 502-0
- Fax+49 7391 502-3399
Components for the wind industry
Liebherr is the only manufacturer worldwide that is not only able to supply individual components as slewing bearings, slewing drives, electric motors and hydraulic cylinders, but able to supply hydraulic and electromechanical pitch systems and electromechanical yaw systems for wind turbines.
An important element of the cooperation with customers from all over the world is the applied application-specific engineering necessary for adapting and matching the individual components to each other. Liebherr works together with virtually all well-known turbine manufacturers and to date has supplied components for more than 15,000 wind turbines. The product portfolio covers components for 800 kW installations up to solutions for multi-megawatt turbines for offshore wind farms.
Pitch systems
Liebherr produces well-engineered mechanical systems for rotor blade adjustment. Electric pitch systems are based on one or more mechanical gear units with electric motor, which drive a geared large diameter slewing bearing.
Hydraulic pitch systems are based on one or more hydraulic cylinders and a slewing ring bearing without gears to adjust the rotor blade position. In either case, the precise positioning of the rotor blades results in maximum energy yield.
In pitch systems, the following components from the Liebherr portfolio can be applied:
Three-row roller bearings for higher load capacity and more cost efficiency
Wind turbines are growing steadily in an effort to attain higher energy yields. The options of adapting existing designs to the growing dimensions and more demanding load profiles has however limits - particularly in regard to rotor blade bearings. Therefore, in addition to the current single-row and double-row four-point bearings, Liebherr now also offers three-row roller bearings for pitch systems. This highly increases the potential in terms of dimensioning and load capacity.
Yaw systems
Depending on the specific system design, up to twelve or more high-performance planetary gearboxes drive a slewing bearing and ensure precises as well as reliable wind direction tracking. Liebherr configures the entire yaw system, including the necessary electric motors, precisely to the needs of the customers. This guarantees a high level of system availability.
The following components from the Liebherr portfolio are ideally suited for use with yaw systems:
Yaw module concept study
In the course of the last 20 years, variety of parts and complexity have steadily increased within the wind industry. With this study, Liebherr wants to show new ways to achieve more flexible yaw system. The result is a module which integrates all functions of the yaw system in a ready-to-install unit.
The current concept offers a wide range of advantages. It can be easily scaled in terms of size and capacity and adapted to the different turbine platforms. Additionally, the use of standard components across all platforms hold great cost savings potential. Further, the implementation of the yaw system as a ready-to-install module makes it possible to simplify processes for the turbine manufacturer along the entire value chain.
Yaw module concept study (PDF, 3.7 MB)Implementation within the wind turbine
Slewing bearings
The range of Liebherr large diameter slewing bearings covers bearings with a diameter of up to 9,500 mm. For wind turbine pitch- and yaw systems this includes single-row and double-row four-point bearings and three-row roller bearings with internal or external gear. For yaw systems, the portfolio also includes gear rings.
Hydraulic cylinders
Since 1958, the Liebherr Group has been developing and producing hydraulic cylinders at the main site in Kirchdorf an der Iller. The product portfolio ranges from highly durable hydraulic cylinders for dynamic applications, large heavy-duty cylinders and dampers to lightweight and special cylinders. Liebherr benefits from its vast experience in the maritime sector also in the development of cylinders for wind turbines.
Gearboxes
Reliability and precise positioning are the crucial factors for the rotor blade and yaw adjustment drives. Liebherr offers multistage planetary gearboxes for the rotor blade adjustment. If required by the installation constrains, they can also be fitted with an angled increment. Three- to four-stage planetary gearboxes are usually used for yaw adjustment. Up to twelve or more yaw drives per system are installed to transmit the high torques encountered in wind turbines in the multi-megawatt class.
Integrated lubrication system
An integrated lubrication supply for pitch and yaw adjustment gears are an ideal complement to Liebherr's offer in the area of gearboxes. The lubrication system can be used with minimum implementation effort and offers considerable savings compared to the existing systems.
Frequency converter systems
Modern wind turbines require reliable frequency converter systems in order to safely feed the steadily increasing power into the supply network. The liquid-cooled frequency converter system Liduro Wind is therefore specially designed for demanding applications in onshore and offshore wind turbines.
Competences
Based on a continuous quality management and the use of cutting-edge technologies, components by Liebherr meet the highest demands regarding quality and performance.
Product and system expertise
The right design and analysis of a component is decisive for its reliability and service life. For multi-megawatt wind turbines a design using Finite Element Methods (FEM) is essential, as the sensitivity to strain increases the larger the system gets. In addition, defined approval processes for new and further developments ensure optimal product configuration and thus high reliability.
High level of vertical integration
In order to ensure consistent high quality and reliability, all manufacturing processes must be optimally aligned. Hence why Liebherr improves all production processes on an ongoing basis and continually invests in cutting-edge production facilities.
Quality-oriented
Reliable components with a consistently high quality are particularly important for wind turbines in order to avoid long production downtimes and high logistics costs. To ensure that the quality standards achieved in the construction using Finite Element Methods (FEM) and Failure Mode Effects Analysis (FMEA) are also maintained in subsequent processes, all company processes are designed to maintain quality.
Test bench for wind turbine main bearings
We test our main bearings for wind turbines on a specially developed test bench. In order to realistically imitate the rigidity conditions of the application, a machine carrier from a wind turbine is used as an adjacent construction.
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Quality testing of slewing bearings
Large diameter bearings with a diameter of up to 6,000 mm are measured and tested in a fully air-conditioning measuring laboratory.
Wide range of slewing bearings
Slewing bearings from Liebherr are available in different designs and a diameter range from 400 mm to 9,500 mm. Larger sizes are possible in a segmented design.
Slewing bearings for wind turbines
Liebherr produces large diameter slewing bearings for the adjustment of rotor blades and yaws in wind turbines. They can be designed as single-row or two-row four point bearings with external or internal gearing.
Slewing drives for wind turbines
Slewing drives from Liebherr for the adjustment of rotor blades and yaws in wind turbines are characterized by reliability and precise positioning.
Slewing bearings for pitch adjustment
Installation of large diameter slewing bearings for pitch adjustment at a customer's factory.
Stress tests in real conditions
Stresses throughout the entire service life of the gearbox are simulated in test runs.
Integrated lubrication supply for gearboxes in blade and yaw adjustment
Liebherr components for the wind industry
Contact
Please contact us – we will answer your questions and put together an individual offer for you. If you need a component as a spare part for your Liebherr machine, please contact your local service partner.
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Quality concrete for wind power installations
The towers of modern wind power generators are made out of prefabricated concrete parts. These concrete components, whose form and strength are subject to extremely high standards, are prefabricated in prefab factories and then assembled at the construction site.
Liebherr concrete mixing systems employing their own mixer systems supply the concrete for these prefabricated parts. They can be connected directly to the production halls and supply the concrete by a bucket conveyor directly from the mixing plant.
The Litronic-MPS process control system in conjunction with the Litronic-FMS moisture measurement system guarantees perfect concrete quality in the correct consistency.
The Liebherr tower mixing systems of the type Betomat and the horizontal series of Betomix systems are both well-suited for the task of producing concrete for wind power tower segments.
Production of tower segments Connection of the concrete mixing system to production
The concrete mixing plant can be directly connected to the production hall for tower segments. You can see a Betomat III-570 mixing system with a stone storage volume of 570 m³ and a concrete output of 140 m³.
Production of tower segments Tower segments made of quality concrete
Transportation of a pre-cast segment half for the lower wider part of a wind turbine.
Production of tower segments Tower segments made of quality concrete
Transportation of a finished tower segment for the upper narrower part of the wind turbine.
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Liebherr-Mischtechnik GmbH
Im Elchgrund 12
88427 Bad Schussenried
Germany
- Phone+49 7583 949-0
- Fax+49 7583 949-395
Gear cutting machines and automation systems
Liebherr has been developing and producing gear cutting machines for more than six decades, and is now one of the leading manufacturers of CNC gear cutting machines and automation systems.
Components in the wind power energy must satisfy the highest possible quality standards. Liebherr gear cutting machines make a major contribution in this respect since they ensure the best possible production quality of all toothed parts, for example large diameter bearings for rotor blade and yaw adjustment. They cover many different production technologies: gear hobbing, gear shaping, and gear and profile grinding. Every machine is built according to customer specifications, and the application options are continually expanded by implementing new requirements.
In the area of automation systems, Liebherr also offers a new portal for economical machining of rotor blades. Automated production increases productivity while production costs are reduced.
Gear cutting machines and automation systems for the wind power industry
Machining of rotor blades
Liebherr supplies portal robots for economical machining of rotor blades in automated production.
Machining of rotor blades
The surfaces of rotor blades are polished automatically.
Machining of rotor blades
The portal robot is equipped with a special machining head for rotor blades.
Gear cutting machines for the wind power industry
The Liebherr LC 500 gear hobbing machine
Gear cutting machines for the wind power industry
The LCS 500 gear grinding machine
Gear cutting machines for the wind power industry
The Liebherr LGF 1000 profile grinding machine
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Contact
Liebherr-Verzahntechnik GmbH
Kaufbeurer Straße 141
87437 Kempten/Allgäu
Germany
- Phone+49 831 786-0
- Fax+49 831 786-1279