Figure 1 Complete test stands are tailor-made to customer specifications.
Figure 2 The test cell for hydraulic products is software-controlled. Each test procedure is initiated from a bar code on the test specimen. Then the automatic test procedure starts.

Ratio-Drive® by Hänchen

  • More than half a century of expertise in hydraulics and seals
  • Extensive experience with hydraulic and electric drive systems
  • Experience in systematic individual design and implementation of customer projects and machine elements
  • Measurement and automatic control engineering, real-time control, measurement acquisition, sensor technology, fieldbus connection and evaluation
  • In-house development of modular software including graphical user interface for control and regulation, and for process level communication
  • Planning and implementation of test machines and test stands
  • Extensive safety concepts up to PLe according to Machinery Directive, CE compliance, safety-related software


Experience both in-house and at customer locations

In-house and customer projects were important steps on the way to becoming a supplier of complete test machines. This reflects many years of development experience – from cylinder construction to electronics, such as sensors for measuring displacement and force. This was followed by complete drive axles, now called Ratio-Drive®. Through these experiences as a system supplier, the company from Ostfildern near Stuttgart understood what the market really needs. That is why the company also provides whole machines complete with axle, frame and machine elements. Our own test stand for efficient and practical testing of sealing combinations and piston rod surfaces was in the making. Such a test machine was also made for the University of Stuttgart.

Another project of Herbert Hänchen GmbH & Co. KG is a new, self-developed and produced test field. It is intended to automate the final inspection of hydraulic cylinders, pressure intensifiers and other hydraulic products, and to ensure process reliability. Volker Kaiser, Quality Assurance Team Leader at Hänchen: "In the past, you had to know every process step in detail. Because in the past, employees controlled the inspection process manually. The test pressure used to be set manually, which was associated with certain discrepancies."


Test centre for hydraulic products
In the new test centre, the test procedure for every product specification is software-controlled. The test procedure is initiated from a bar code on the test specimen. Hänchen's proprietary test software accesses data from the ERP system and automatically sets the correct parameters, such as test pressure and traversing speed. At the end of the test, data such as pressure and speed are recorded by the program in a test certificate and archived in the corresponding customer folders of the document management system (DMS). The document can be then called up and passed on to the customer whenever necessary. This makes every test procedure both comparable and reproducible.  A mounting fixture that was specially adapted to Hänchen's typical test specimens enables better and safer handling. It allows components, such as a hydraulic cylinders with an outer diameter of 25 - 500 mm, to be securely fixed. The length of the test cell was designed for a maximum component length of 2.50 m. Larger components can also be connected and tested outside the test cell.

Technical data of the test centre

  • Maximum precisely configurable hydraulic pressure of 500 bar or 1,000 bar if using a pressure intensifier
  • Maximum adjustable flow rate up to 30 l/min
  • Oil used: HLPD46

Hydraulics

  • Radial piston pump 30 kW
  • Monitoring of oil temperature and level
  • Pressure monitoring

Elektronics

  • Touch displays
  • Frequency converter for motor control
  • Beckhoff control system


Software and safety-related technology

  • Software created by Hänchen
  • Monitored test stand doors
  • Safety concept according to PLe
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