Crawler Tractors PR 724 – PR 764
Product information
Grade control systems
Grade control systems for crawler tractors
To be successful despite the constantly increasing cost and time pressures, construction machinery must meet the highest demands regarding working speed and accuracy. Increasingly, automatic grade control systems are utilized to improve the productivity of operator and machine.
They utilize existing planning data to automatically guide the machine attachments when removing or spreading material.
With the aid of the most up-to-date technology, complex surfaces and exact grades can be produced quickly and precisely.
Advantages of automatic grade control systems:
• The use of stakes and string lines, as well as personnel costs for these tasks are dramatically reduced
• No loss of time due to constant measurement checks or extensive rework, resulting in better machine utilization
• Fewer passes mean less wear and lower fuel consumption
• More accurate grading improves material economy due to controlled material usage
• Significant cost savings for the owner and ultimately higher profits
Liebherr crawler tractors are eminently suitable for application of automatic grade controls, thanks to their innovative drive system. The hydrostatic drive provides uninterrupted power without the need to shift gears. Due to the long tracks and the perfect match of front attachment, working hydraulics, and base machine, exceptional grading properties are ensured.
Depending on the type of application, various technologies are utilized. To simplify the installation, Liebherr offers a number of installation kits. They ensure that the retrofit installation of the grade control system on the crawler can be completed without requiring access into the interior of the machine.
2Grade control systems
Laser control
Applications
•Creation of horizontal or sloped grades with high accuracy
•Suitable for small to medium sized construction sites
•Application for construction of sports fields, storage or dump sites, road construction, housing and residential areas, etc.
Components |
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Symbol images only |
In terrain |
On the dozer blade |
In the cab |
Rotary laser |
1 or 2 laser receivers |
Option: |
Control unit |
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Cross slope sensor |
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How it works
The rotary laser rotates at high speed and in doing so generates a reference plane out of laser light. This plane can be horizontal or sloped, but it is always planar (two dimensional).
The laser receivers are installed on masts on the blade of the crawler tractor. They catch the emitted laser beam and determine the current elevation of the dozer blade in relation to the reference height. For applications with lower accuracy requirements, a single laser receiver is sufficient to determine the elevation of the blade (single laser). Normally, two masts or one mast and a slope sensor are installed, this “dual operation” allows both the blade elevation as well as tilt to be determined).
The control unit processes the signals from the laser receivers and the slope sensor and constantly regulates the elevation and tilt of the blade automatically via the working hydraulics.
When working in automatic mode, the operator only needs to steer the tractor, while the grade control automatically regulates the movements of the blade, creating a grade parallel to the laser surface.
Useful information
•Visual contact between the rotary laser and the crawler is required
•Simple and comparatively inexpensive system, however no 3D contours can be created
•Several machines can work in the same grading level with a single rotation laser
•Height accuracy < 1 cm
Grade control systems |
3 |
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