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Stroke measurement in hydraulic cylinders: say goodbye to drilling pistons

Home Agriculture Stroke measurement in hydraulic cylinders: say goodbye to drilling pistons

WHETHER it’s agricultural machinery, construction equipment, or municipal vehicles, intelligent sensors are indispensable throughout the mobile machine market.

That’s according Instrotech, local distributors of SIKO and SGH10, which it describes as a unique measuring system for direct stroke measurement in hydraulic cylinders

“This specialised, integrated and innovative measurement solution is based on customer feedback and many years experience in path measurement technology,” the company said in a statement.

The cylinder stroke is measured precisely using Bowden cable sensor technology installed directly in the cylinder. “The high-quality plug ensures the system fulfills protection class IP69K.”

According to Instrotech, the SGH10 cylinder stroke measuring system pursues an entirely different technological approach than systems commonly found in the market, which are based on magneto-restrictive, inductive, or hall-based technology.

In contrast, a Bowden cable mechanism installed directly in the cylinder is used to measure the stroke. The cable of the Bowden cable mechanism is mounted in the piston head. If the cylinder is extended, the cable, which is wound up in a cable drum, is pulled out.

“The rotation of the cable drum that is thereby created is detected without contact by the sensor electronics and used to calculate the linear travel. This makes it possible to detect the position of the cylinder precisely and completely at all times.”

The magnets used to detect the rotation are scanned by the electronics through the pressure-resistant base plate of the SGH10. The electronics are fully encapsulated on the unpressurized side of the system.

Clear advantage

“This means the entire measuring system is built into the cylinder and is optimally protected from external environmental conditions. This provides a clear advantage: in contrast to a measuring system mounted externally on the cylinder, the sensor system cannot be influenced or damaged by loose parts or by environmental influences.”

Another distinctive aspect is the reduction of costs for integrating the system into the cylinder. This is because in previous measuring systems, the sensor rods had to be integrated into the piston over the entire measuring path.

“This often required long and highly precise bore holes in the piston. This is not only expensive, but also weakens the structure of the piston. In the SGH10 stroke measuring system, just one small thread is needed in the piston to mount the cable.”

This, said the company, allows the system to offer major potential cost savings, which affects production times and, ultimately, overall costs for hydraulic cylinders.

“The greater the stroke length, the greater the potential for monetary savings. Cylinder manufacturers, mechanical engineers and end-use customers reap the benefits.”

Another benefit is that, in contrast to alternative measuring systems, the SGH technology can even be used in telescopic cylinders. “It provides design engineers with entirely new options when developing forward-thinking assistance systems and supplemental functions in mobile machines.”

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