Electro-hydraulic Servo Fatigue Test Machine

Maquina de prueba de fatiga servo electrohidraulicaIntroduction
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driven to move up and down through the hydraulic system,
to adjust the test space.
The main frame adopts four columns frame structure, the
actuator is arranged in the upper beam, and piston head of
actuator is provided with a special fatigue load sensor, by
using different types of fatigue grips, to different types of
fatigue test. Upper beam adopts hydraulic lifting structure
and hydraulic clamping device, the whole frame adopts the
seamless connection design.
The main frame structure introduction The main frame adopts double pillar single space structure,
the base, actuators, pole, to ensure tensile, compression
and fatigue test. Using the special hydraulic chuck, high
precision load sensor, and hydraulic lock device no
clearance, can move beams etc. The hydraulic lifting and
lowering beams, with hydraulic lock function, which is easy to
positioning, reliable lock and operate. Beam position can
adjust freely. The actuator platform, oil cylinder integration
design, high rigidity, more traditional modular cylinder,
leakage link less, more wear and stiffness higher.
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The power of the hydraulic source adopts the self-adaption servo pump technology. The frequency
and amplitude can be set according to the test requirement. When these two parameters were
set, the control system will adjust the oil pump flow automatically, then the system thermal value
will be decreased to the lowest level. And the system noisethe electricity consumption and the
water consumption will be decreased to the lowest level. This technology had been used widely on
our high flow fatigue test machine and effect is obviously.
Cooling method of the servo oil source is water cooling to decrease the oil temperature. Cooler is
brazed welding structure with high cooling efficiency, small volume.
About the filtering of the hydraulic oil in the hydraulic system, a filter on the oil inlet was installed
to protect the oil pump. A high accuracy pressure tube filter was installed on the front of the servo
valve to protect the servo valve. A filter was installed on the oil outlet to clean the hydraulic oil. An
oil pollution sensor was installed on each filter. When the sensor sends out the signal, the system
will alarm automatically. The relative filter should be replaced timely.
Meantime, an oil level sensor is used. When the oil level is lower then the setting value, the sensor
will send out a signal automatically to stop and protect the oil pump.
Oil tank is designed specially to separate the oil inlet area and oil outlet area. An filter screen is
used to separate these area. An oil temperature transformer was used to measure the oil
temperature.
Hydraulic source included an oil tank, a high pressure oil pump with an integrated motor,
electromagnetic valve and integrated valve piece, cooler, relief valve, pressure gauges ,and etc.
The hydraulic source adopts non-leakage technology. In any working environment and status, no
any leakage happens.
Hydraulic source introduction
Electro-hydraulic Servo Fatigue Test Machine
- Clips position adjustment is convenient, the piston position of actuator stepless adjustable
- Wide measurement range, different samples can be measured bu using a single actuator, do
not change different actuators;
- Using the special fatigue level load sensor, the service life is long;
- Frequency and amplitude digital adjustment, to achieve simple operation, no need to adjust the
oil source system;
- The value of test load (amplitude or valley value) digital setting and adjusting by automatic control
system. The fatigue test will begin after the device reaching the
- Load and displacement waveform arbitrary choice in test process.
Product characteristics
Product Configuration
Technical specification and performance
Grips configuration
EDC controller features
PLW series computer control electro hydraulic servo fatigue testing machine adopts German
Doli company full digital dynamic testing machine controller EDC system, to ensure stable
performance and accurate control.
- Use "CPU + DSP" dual control and bus slot type structure, to achieve convenient extension
and excellent dynamic performance
- Computer communication based on internet access (RJ45) to achieve high speed of data
transmission and real-time data processing.
- The bus slot type structure, can be extended to connect multiple sensors.
- Use the high speed of sensor data acquisition card to ensure high speed response and
dynamic control of the precise sampling data.
- Smooth switching in displacement, load and deformation of closed-loop control.
- The built-in function generator, to achieve control of sine wave, triangle wave, square wave,
oblique wave, combination wave.
- Each measurement channel synchronous sampling to ensure test results real.
- Closed loop rapid control and high frequency to achieve dynamic control completely.
- Electrical design meets safety standards of EMC.
- Sampling and control frequency stability, to ensure the accuracy of the data and control.
Function
1) Material S-N curve;
2) With the function of material stress control and material strain control;
-The software can achieve the tests of high cycle fatigue, low cycle fatigue,
bending fatigue and static tensile.
-In the course of the experiment, it can achieve real-time display control signal
(wave of load and displacement), and the feedback signal (wave and value of load,
displacement). In the case of the test without interruption, to achieve adjustment
of the parameters (such as control signal of the amplitude and frequency) and
change the corresponding value of the feedback signal.
º High rigid frame high safety coefficient, small deformation, high stiffness, stiffness of up to
400 kn/mm;
º Load sensors with soft protection function, the vertical overload resistance of the sensor
was 300%, 40% of lateral resistance;
º Hydraulic system is equipped with the overflow valve, over pressure system automatic
overflow;
º Hydraulic system equipped with detecting the oil temperature, liquid level, pressure testing
facilities, such as more than the oil temperature or below tank of liquid level, the system will
automatically stop, in order to protect the hydraulic components from being damaged.
º Urgent stop switch be set in system installation to ensure quickly stop when abnormal
situation.
Test Software Introduction
º Oil distribution system, hydraulic system equipped with logic valve, to ensure that the three
sets of equipment in the future can work independently, at the same time avoid the negative
influence of servo valve zero leakage.
º Equipment installed on the hydraulic pipeline are completely fixed, prevent loose hydraulic
impact caused by pipeline, pipeline between pipe and pipe welding joint forms, ensure no
leakage.
º Equipment with water protection device to prevent high temperature causes the damage of
equipment and sample.
º The software system has the protection function such as constant load, positioning
The software adopts modularized design with reasonable layout and nice interface. The software is easy to operate, runs security and stability, and deals with data eciently and accurately. This software not only supports the fatigue test of a single wave, but also supports the fatigue test of complex wave (combined wave).
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2) The Main Interface
Rational Interface direct displays testing process, test results. The main interface features are: real-time collection of multi-channel dynamic data display, multi-axis test curve dynamic display area, the operation status display section, guided quick action buttons, etc.
Create test items
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Test method set interface
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Test method set interface 3Test control
Test method set interface 3 (Specimen)
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Test method set interface 4 (Curve conditions)
Test method set interface 5 (Environmental conditions)
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º Support product security protection function low liquid level, over temperature, lter plugging, overload, preset fatigue times, etc. º The non-contact displacement sensor, no wearing, and need not to calibration; º The displacement sensor MTS, absolute position measurement, resolution as high as 0.001 mm; º Load measurement using Interface fatigue special sensors, high precision, long life, up to 100 million times; º Fully enclosed hydraulic source and reduce noise; º Using digital DOLI controller, high control accuracy; º Digital controller, synchronous channels collection technology, eliminate phase dierence º Using the special adaptive variable technology, to achieve the lower heat sends out by system, the rotational speed be reasonable controlled, and the noise reduced. º The interface of software has the function of oil temperature and oil pressure monitoring channel; º It can achieve automatically measurement, control, data acquisition and processing, drawing curves and print reports. The main contents of print: test conditions, the original parameters, the test curve (or local amplication curve), the test results. º The following curve can be drawn: force-displacement curve, force-time curve and displacement-time curve. º Measurement system has automatic zero setting, automatic calibration function. And can measure for fully range but doesn’t need to grade. º System can control and keep the test force, deformation, displacement. 5% overload will protect automatically. º Innite speed variation and control method (force, displacement) can be shifted during the test freely.
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Highlight of product
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Packing list
º The user is responsible for receiving, unloading, hoisting, and the supplier is responsible for free installation debugging online. º Installation requirements: testing machines are installed on a solid foundation, install level degree ≤0.2/1000, the surrounding space left is not less than 1m, interior clean, dry, non-vibration and corrosive gas, power supply AC380V, 50Hz, voltage uctuations no more than ± 10% of the rated value. º The user provides hydraulic oil (46#) for debugging. º The user provides cooling water (We suggest install cooling system); º Our company oer free commissioning and training service to our customers, to make technicians to achieve skilled operation
º The software is free to update all the time. º For the non-human failure, we will supply free maintenance and replacement for defective parts. º For the equipment operation failure, we will provide an online solution. If the problem cannot be solved, we will send engineers to conduct professional repair service.
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Electro-hydraulic Servo Fatigue Test Machine