The LR-CW300 microcomputer-controlled electro-hydraulic servo fatigue testing machine is mainly used for testing the dynamic and static mechanical properties of steel bar connectors, steel bars, metal materials, and components. It can conduct mechanical property tests in various ways such as tension, compression, bending, tension-compression, and bending-bending, and can perform high-frequency and low-cycle fatigue tests in the form of sine waves, triangular waves, and rectangular waves. By adding the WCOD crack propagation system, it can conduct crack propagation tests. By configuring high and low temperature chambers, it can conduct high and low temperature mechanical property tests. This testing machine complies with GB/T42903-2023, GB/T1499.2, and GB/T28900, etc.
The development and research of the LR-CW300electro-hydraulic servo fatigue testing machine have drawn on the development and manufacturing experience of internationally renowned electro-hydraulic servo dynamic testing machines. It adopts the "unitization, modularization, standardization" development concept, absorbs advanced international electro-hydraulic servo dynamic testing machine technologies, and is designed based on the actual usage conditions of domestic users. The key components of the electro-hydraulic servo dynamic testing machine are selected from well-known brands of domestic and international similar products, which greatly improves the stability and reliability of the system. This series of products have the characteristics of being easy to use, high control accuracy, and high reliability.
The LR-CW300electro-hydraulic servo fatigue testing machine is mainly composed of a main machine frame, a 300kN servo cylinder, a 75L/min constant pressure pump station, an oil source air-cooling system, test accessories, hydraulic servo drive module, crossbeam lifting drive module, full digital servo control system, and testing software, a computer, a printer, etc. The working principle diagram and control block diagram can be referred to in Figures 1 and 2.
Figure 1 System Working Principle Diagram
1. Mainframe:
The mainframe is a two-column frame structure. The lower part is a base cover. Inside the base cover, there are 300kN gap servo cylinders, hydraulic servo drive modules, crossbeam lifting drive modules, etc. On the top of the base cover is a tabletop panel. The tabletop panel is connected to the two columns and the upper crossbeam, and the upper crossbeam can be adjusted in height by the lifting cylinders on both sides. The upper crossbeam has a locking system. The tabletop panel, columns, and upper crossbeam form a force-bearing framework. The servo cylinders are fixed under the tabletop panel, and the piston rod is equipped with a lower fixture. The upper crossbeam is equipped with a load sensor for measuring the test force, and the sensor is installed below the upper fixture, allowing the sample to be clamped between the upper and lower fixtures for the test. Customers can adjust the height of the upper crossbeam according to the length of the sample, thereby adjusting the test space to meet the requirements of the test. The servo piston rod lower end is equipped with a displacement sensor for measuring the piston's displacement (amplitude). The test accessories can be replaced according to different tests to meet more test requirements. The crossbeam adjustment uses hydraulic lifting, hydraulic and mechanical combined locking to ensure the crossbeam is firmly locked, and the test results are more accurate. The mainframe of the testing machine has the characteristics of freely adjustable crossbeam lifting, high rigidity of the frame, convenient sample installation, good alignment, etc.
2. Servo cylinder:
The servo cylinder is the core component for outputting test force and displacement in the testing machine. The cylinder barrel undergoes precise grinding, the piston rod undergoes surface quenching, ultra-precision grinding and electroplating, and the sealing parts use imported Stroh seals, Glay rings, and guide belts to ensure low friction of the actuator, good sealing performance, fast dynamic response, and long service life. The servo valve is selected from well-known brands such as American MOOG or domestic brand HY.
3. Test accessories:
The tensile accessory and compression accessory are standard test accessories. In addition, there are bending accessory and shear accessory that can be selected. Special accessories can also be designed according to requirements.
4. Adjustable pressure station:
The station is in a cabinet-like structure, simple and elegant, with good sealing performance. The station mainly consists of a frame, oil tank, oil pump motor group, valve block, hydraulic components, piping, cooling system, etc., providing hydraulic power sources for the servo valve. The output pressure of the hydraulic pressure station can be adjusted, and high and low pressures can be switched to meet the supply of oil sources under different test conditions. The cooling system can be selected from air cooling, water cooling, and compressor cooling according to different conditions.
hydraulic power pack air cooling device
5. All-digital servo controller:
The control system adopts our company's fully digital dynamic hydraulic servo controller. Main Configuration:
5.1 A core control module based on DSP that supports multi-channel closed-loop control;
5.2 A signal conditioning unit with three sensors (force, displacement, deformation);
5.3 A two-level servo valve drive unit;
5.4 A test control software specially developed according to the railway fastener test standards;
6. Computer, Printer:
To ensure the reliability of the test, the computer is selected as a Rockwell industrial control computer, and the printer is HP brand.
Maximum static test force & static indication accuracy
Maximum static test force: ±300kN, Static indication accuracy: full range without step ±0.5%
Maximum dynamic test force & dynamic fluctuation
Maximum dynamic test force: ±300kN; Dynamic fluctuation: no more than ±1.5%
Servo cylinder amplitude
Servo cylinder amplitude: maximum amplitude ±100mm
Frequency range
Frequency range: 0.01~50Hz
Displacement measurement accuracy
Displacement measurement accuracy: ±0.5% of the indication value
Displacement measurement resolution
Displacement measurement resolution: 0.001mm
Function generator
Multi-segment function generator
Counter
Counter: 999,999,999, presettable
Control mode & test waveform
Control mode: load, displacement, deformation control mode, main test waveforms: supported by the controller (including sine wave, square wave, triangular wave, ramp wave and external input waveforms)
Maximum test space
Maximum test space: 600mm (hydraulic accessories)
Column distance between stands
Column distance between stands: 645mm
Host machine dimensions
Host machine dimensions: left and right 1235 × front and back 800 × height 2565mm
Pump station dimensions
Pump station dimensions: left and right 860 × front and back 1450 × height 1220mm
Hydraulic pump station parameters
Hydraulic pump station: flow rate 75L/min, maximum pressure 28MPa, motor power 37kW
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