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A crawler crane is a sliding frame mechanism that is widely used to lift heavy objects in construction projects. As the name suggests, these cranes are fitted upon a tracked platform-crawlers, which provides stability and mobility. A FUWA Crawler Crane is designed and manufactured by the FUWA company. The heavy weights are moved at slow speeds by the use of a hydraulic pump, motor, and cylinder that form the hydraulic system of the crane. These types of cranes are used in large-scale infrastructure projects such as roads, bridges, and power plants.
Types of FUWA Crawlers:
Regular Crawler Cranes:
The tracked base of a regular crawler crane can easily move over uneven terrain by sliding sideways, crawling forward, and crawling backward. Crawler cranes are often employed in situations where standard wheeled cranes would be unable due to both weight capacity demands as well as ground conditions. Regular crawlers have good stability and lifting capacity, making them very suitable for dealing with heavy objects at great heights.
Modernized Crawler Cranes:
Crawler cranes with modern features may have an airborne cab, which allows the operator to see from a higher point during operations. These modernized models also often come equipped with sensors and other technology that aid in providing safe and efficient lifting operations. These innovations lead to increased productivity while simultaneously enhancing safety standards on construction sites where these machines are employed.
Heavy-duty Crawler Cranes:
A motor, gearbox, and sprocket make up the crawlers' driving system. Heavy-duty crawler cranes are specifically intended for the most massive and demanding lifts, typically found in large-scale construction projects such as power plants, offshore oil rigs, or the assembly of wind turbines. To accommodate their increased capacities, heavy-duty crawlers may feature heavier counterweights, more robust structures, and advanced load-moment indicators that provide real-time information about the machine's stability and load capacity. These enhancements ensure safe operation even under the toughest lifting conditions.
Load capacity
The load capacity of a crawler crane is the maximum weight it can lift and move, measured in metric tons (1,000 kg).
Length
The overall length of the crawler crane is measured from one end to another, including the body and the boom.
Width
The overall width of the crawler crane is measured from one side to another, including the body and the tracks.
Height
The overall height of the crawler crane is measured from the ground to the highest point, including the body and the boom.
Boom
The boom of the crawler crane is the long, movable arm that raises and lowers heavy loads. It is usually made of high-strength steel and can be extended or retracted to reach different heights and distances. The boom is mounted on the top of the crane and is rotated horizontally to align with the load.
Track
The track of the crawler crane is the undercarriage that provides mobility and stability. It consists of two parallel chains or bands that distribute the weight of the crane and the load over a large area. The tracks move the crane by dragging it forward and backward, allowing it to traverse rough terrain and slippery surfaces.
When operating and maintaining a crawler crane, it should be developed in accordance with the instruction manual. To quickly introduce some of the parts that need to be maintained.
Maintenance of crawler:
Normally, the drive belt can be checked once a week, and the tension is adjusted as needed. If any cracks or hardening are found, the belts should be replaced. Dry and clean tracks should be used to remove debris, and loose bolts, etc., should be checked. Lubricate the track rollers and track rails with grease as needed.
Maintenance of boom:
The condition of the boom needs to be checked daily during use. The lubrication points are generally boom rotating parts, boom, and boom top and cylinder parts, etc. They should be lubricated at least once every ten hours of working time. Apply grease to the sliding parts of the boom and the sliding parts of the boom and the hydraulic cylinder at the top of the boom.
The main operating scenarios of crawler cranes are construction sites and various maintenance and inspection occasions. The following paragraphs will cover some typical working scenarios of crawler cranes.
The primary operating scenario of crawler cranes is large infrastructure and construction projects, such as road and bridge construction. The stability can adapt to different soil quality. No matter the loose frozen soil or solid rock, they can create secure support for the lifting operations.
Crawler cranes are good at adapting to different terrains, making them suitable for some harsher natural terrain to work. For example, in mountainous areas and islands, these places often have a steep slope or unstable soil. Such working environments are difficult for ordinary vehicles to traverse. Thanks to its continuous track design and excellent adaptability, the crawler crane can stabilize and safely operate in such a challenging environment.
Crawler cranes work well in extreme weather, such as high or low temperatures. They remain operable in a temperature range between -20°C and 50°C. This wide temperature range enables them to operate in diverse climatic conditions. As a result, they remain functional regardless of the seasonal changes, thereby ensuring a steady progression in the construction tasks.
Working Capacity:
The working mass/U.S. ton/MT is the main determining factor of the handling weight. For example, a 50-ton crawler crane indicates that its full handling capacity reaches 50 tons. This includes the weight of the crane itself and the weight of the lifted object. Please note that the actual working and lifting capacity may differ from the nominal values, and the latter should be considered a guideline rather than an absolute.
Working Radius:
A key factor affecting the lifting weight is the working radius, which is the distance from the center of the crane to the lifting point. When the working radius increases, the crane's capacity decreases. A 50-ton crawler crane may have the ability to lift 10 more tons at a radius of 10 meters than at a radius of 15 meters.
Flexible Boom System:
The boom length/range is another important specification. The boom is a key component of the crane, which is used to support heavy objects and control their movements. The range/length of the boom directly affects the crane's ability to work at different distances and heights. Choosing a crawler crane with a flexible boom system allows more job possibilities to be explored.
Ground Pressure:
Crawler cranes generate ground pressure, which is the force exerted by the crane's track on the ground. This pressure is typically measured in pounds per square inch (psi) or metric tons per square meter. Due to its large tracks, a crawler crane exerts less ground pressure than a wheeled crane. This allows the crawler crane to work on softer ground and to spread its weight more evenly over a larger area.
Q1: What is the difference between a crawler and a wheeled crane?
A1: Crawler cranes are supported by two huge tracked motors, also known as crawlers, while crawler cranes are bergen driven by two parallel wheels. Crawler cranes are more suitable for uneven or soft ground than crawler cranes due to their better weight distribution. However, wheeled cranes are more speedy on flat surfaces.
Q2: How does a Crawler crane work?
A2: A Crawler crane works basically the same as other types of cranes. First, it is brought to the location of the required task, and second, the crawler's horizontal box is laid down. After this, the crawler moves to position itself. Thirdly, the load is attached and evaluated by the Crawler Cranes driver or examiner. Finally, the load is released after the task is done.
Q3: What does a Crawler crane's capacity mean?
A3: The Crawler crane's capacity is usually listed as maximum rated load, which tells the maximum weight the crane is able to lift. Factors, such as the crane's configuration, the position of the counterweights, and the grounded/leveled condition of the way it is placed, are considered when determining the maximum rated load.
Q4: What are Crawler cranes used for?
A4: Crawler cranes are mainly utilized to transport heavy construction elements like steel girders and heavy machinery. Besides, they are also used in the mining industry for tasks like removing overburden, digging deep holes, and building structures, while in the maritime industry, they are used for tasks like salvaging sunken ships and extracting resources from the sea.
