Table of contents:
- Easy integration
- A tailor-made solution for all cylinders
- Intelligence for dynamic cylinder movements
Video: Intelligent Position Measuring System For Hydraulic Cylinders
Measurement technology According to Liebherr, the completely new measurement concept Liview uses the cylinder itself as a very robust measurement section. The position measuring system consists of the evaluation electronics and two probes. It measures the scattering parameters of the hydraulic cylinder over the frequency range. Liview uses this to calculate the position and speed of the piston in real time. This enables dynamic automation of machines for more efficiency and higher productivity, says Liebherr.
Easy integration
According to the manufacturer, this measurement concept allows all components to be permanently installed. No moving parts in the oil are necessary. This also prevents oil contamination in the event of a defect in the position measuring system, which can lead to a machine failure.
Liebherr designed Liview so that quick and easy mechanical integration should be possible. The evaluation electronics can either be installed directly on the outside of the cylinder or at any location near the cylinder. Only the two small probes need a connection to the piston rod bearing. The probes float on an oil film and are wear-free. With the integration, no further modifications to the cylinder or drilling of the piston rod are necessary, explains Liebherr.
A tailor-made solution for all cylinders
The system's integration concept is designed to ensure that all parts are easily accessible. According to Liebherr, this enables quick and easy service in the event of external damage - without draining the oil, removing or disassembling the cylinder.
The space in the cylinder remains fully usable for the stroke thanks to the minimal integration effort. This means that the complete cylinder length can be used even with the path measuring system installed - without having to adapt the machine design. The Liview concept enables installation in both very small and very long cylinders. The system is therefore generally suitable for all cylinder lengths and piston diameters.
Intelligence for dynamic cylinder movements
The range of functions of Liview can be selected according to the application. This ensures high efficiency in the use of the system, according to the manufacturer. For safety-relevant applications, the system is optionally certified according to EN ISO 13849 PL d or EN IEC 61508 SIL2.
The intelligent displacement measuring system Liview calculates the speed of the piston in real time with a fast measuring cycle of <200 μs. This reduces control latency. This should enable efficient position control of the cylinder. This is particularly advantageous, for example, when dynamically approaching a predefined work area boundary. (jv)
Hannover Messe 2017: Hall 21, Stand A 08
For closed control loops
Directly controlled proportional directional valve
Popular by topic
Carbon Fibers Make Hydraulic Cylinders 70% Lighter
Three technologies have been developed for the manufacture of lightweight rods and tubes that come together in the carbon composite H-CFRP. The hydraulic cylinders made from it are 70% lighter than steel cylinders
Individual Series Production Of Hydraulic Cylinders Without Over-engineering
Systematically modularized cylinders are the backbone for efficient special production even when extensive tasks for design and development are involved. But the apparent contradiction has a method
Rope-based Variable Position Measurement In Hydraulic And Telescopic Cylinders
With the new wire feeders SGH25 and SGH50, Siko is expanding the measuring range of the SGH series, whose measuring lengths now range from 0 to 5 m in total. They are now also suitable for larger cylinder strokes, which can be found in hydraulic cylinders and telescopic cylinders of construction machines, agricultural machines or in commercial vehicles
Image Processing Measuring System Now With Motorized Measuring Table
Mitutoyo extends its image processing measuring system Quick Image by a variant with a motorized measuring table. The brand new QIPAK 6.1 software also features a stitching function for a large measuring range
Measuring System For Direct Stroke Measurement In The Hydraulic Cylinder
The SGH10 from Siko is a new, integrated measuring system for direct stroke measurement in the hydraulic cylinder. The cylinder stroke is recorded absolutely by means of cable pull sensors, which are installed directly in the cylinder
