Modernisation and maintaining the value of material testers with hydraulic drives.
Testers with hydraulic cylinders are retrofitting and modernising by Retrofitmach. We deliver the complete system: starting with the transducer excitation and the signal conversion up to the digital drive control, in the appropriate mode.
Besides the valve amplifier we also deliver the respective hydraulic valve, continently a new hydraulic aggregate remote control, PCs for the measured value display, software for graphical analyses and data acquisition.
Field of application
The fields of application are widely spread: metal, plastic, rubber, food, aso. Select the appropriate software module for your application. A special testing system always is a challenge for us. Especially, if it is far beyond the usual testing system.
Electronic control system must be chosen by applied test type.
Retrofitmach uses Doli EDC Controllers (Made in Germany) and Doli Test & Motion softwares to upgrade the test machines.
EDC220 control systems: 1000 Hz system clock, generally use for static test systems.
EDC580 control systems: 5000 Hz system clock, generally use for static and dynamic test systems.
EDCi20 control systems : 2500 Hz System clock, generally use for static test systems.
EDCi70, EDCi50 control systems : 10000 Hz System clock, generally use for static and dynamic test systems.
For standard solutions we offer our low-cost Test&Motion Program.
The Intelligent Solution for User Test Applications
A test software should be able to:
1. Display everything I want to
2. Evaluate everything I need to
3. Give everything out the way I like it
DOLI combines these tasks in the Test&Motion Software. Different information is shown in different windows at the same time.
Test&Motion was developed in a modular design. It consists of the basic software containing a simple but adaptable tension/compression test and different modules for almost all kinds of testing applications. The special module Free Programming offers the possibility to design tests individually.
All sorts of signal sources can be displayed. Load, position and strain are standards, moreover other transducers or calculated results can also be displayed.
Variables are shown as curve in X- or Y-direction or listed digitally. Furtheron, users have the possibility to: change the names of the variables (e.g. load or F), zoom the graphic several times and store remarks within the graphic. If a bigger view of the curve is needed, the graphic window can be drawn up to screen size. Due to the organization in a single window, users do have the possibility to move important values to a point where user can still see them. T&M is able to process several EDCs in a multiaxial manner. EDCs can be cascade and -what is even more important- synchronized, resulting in absolute identical signals for all channels. T&M can communicate with several EDCs at the same time.
Possible X- and Y-axis quantities: load, stress, X-head travel, strain, technical strain, time (from test start), true strain, nominal strain, time and defined signal input Determination of five values on the X- or Y-axis, maximum, breach as X- and Y-value. Corresponding determination of values for compression tests.
Statistic functions: mean value, min/max value, range, median, standard deviation, practical limit of error, aso.
Display of all data sent by the instrument: load, X-head travel, strain and defined signal input.
Manifold For Static Hydraulic Testers
With static hydraulic testers mostly servo proportional valves or servo valves are used. A manifold which provides the necessary connections, is deployed for a simple connection of the hoses and valves.
Older but still robust and very precise hydraulic testers are widely spread. Usually the problems for these kinds of testers can be found in the control and measured value acquisition. Due to the fact that these parts of the instrument are over aged and intricately in handling, they often don’t even offer the possibility to run the tester via PC or to get reliable measured values. Retrofitmach offers you the solutions for these problems and even more.
• Load: Via a pressure transducer the working pressure is determined and multiplied with the piston area. This may also be done (looking it at mathematically) via calibration.
• Strain: Connection of customary strain transducers. Some suppliers already deliver their transducers with sensor plugs, suitable for the EDC.
• Position: Retrofitmach adds special position measurement gauges like incremental sensors, encoders, LVDT's.
If the analogue or some old basic systems are extended with a valve and the hand control valves are replaced with a digital control output and a valve amplifier; a manually controlled tester becomes a digital controlled tester. When doing such a modernisation, the hydraulic power unit is exchanged (if necessary) and ergonomic as well as environmental aspects will be considered.
After this modernisation test runs can be executed via PC.