With a measurement accuracy of ± 0.5% and a loading capacity of up to 2000kN, this device is reshaping the precision boundaries of material testing. In the fields of materials science and industrial quality control, the microcomputer controlled electro-hydraulic servo universal testing machine is a key equipment for testing the mechanical properties of materials. By integrating precision machinery, hydraulic transmission, and digital control technology, it achieves high-precision testing of mechanical properties such as tensile, compressive, bending, and shear of various materials, including metals and non metals. It has become a core equipment for modern industrial testing and scientific research.

Working principle: Precise combination of electro-hydraulic servo and closed-loop control

The core technology of the microcomputer controlled electro-hydraulic servo universal testing machine lies in the electro-hydraulic servo closed-loop control system. The system generates hydraulic power from a high-pressure oil pump, converts control signals into hydraulic signals through an electro-hydraulic servo valve, drives the movement of the oil cylinder piston, and applies test force to the sample. The workflow begins with the computer sending control signals to the servo valve, controlling the opening and direction of the servo valve, thereby controlling the flow into the cylinder. Sensors installed on the testing machine, such as load sensors and displacement sensors, monitor the response signal of the sample in real time and provide feedback to the control system. The control system continuously adjusts the opening of the servo valve by comparing the feedback signal and the set signal, forming a fully closed-loop control loop. This design achieves closed-loop control of the three parameters of experimental force, deformation, and displacement, enabling precise control of the experimental process. The system supports multiple control modes, including constant rate loading, constant rate deformation, constant rate displacement, etc., and can achieve disturbance free switching of multiple control modes in one experiment.

Structural Design: Integration of Scientific Layout and Humanized Operation

The testing machine adopts a four column main engine structure with a bottom mounted oil cylinder, consisting of a machine base, a working oil cylinder, a test bench, an upper crossbeam, a screw, a light bar, etc. The stretching space is located above the host, and the compression and bending test space is located between the lower crossbeam of the host and the workbench, forming a dual space design. The transmission system uses a motor to drive the sprocket mechanism and screw pair through a reducer, achieving the lifting and lowering of the lower crossbeam and adjusting the test space. The hydraulic system includes components such as oil pump motor group, servo valve, oil tank, etc., providing a stable hydraulic power source. The core of the measurement system includes force sensors, displacement sensors, and electronic extensometers. The force sensor measures the test force, the displacement sensor measures the piston displacement, and the extensometer is specifically designed to measure the deformation of the specimen. The test power resolution of modern testing machines can reach up to 1/500000 FS, and the displacement resolution can reach 0.001mm. The control system adopts full digital multi-channel closed-loop control, and the built-in controller based on PCI technology ensures precise closed-loop control of test force, deformation, and displacement. The software system provides rich experimental curve display and data processing functions.

Performance characteristics:

The microcomputer controlled electro-hydraulic servo universal testing machine has measurement accuracy. The relative error of the test force indication shall not exceed ± 0.5%, and the error of the displacement indication shall also be within ± 0.5%. This level of accuracy meets the requirements of national standards for 0.5 or 1 level testing machines. Wide range measurement capability is another major feature. The measurement range of experimental force can reach 1% -100% FS, and some models can even start accurate measurement as low as 0.4%. This wide range measurement capability enables the device to test both high-strength metallic materials and accurately evaluate low-strength non-metallic materials. The multifunctional testing capability enables the equipment to perform various tests such as stretching, compression, bending, and shearing. By replacing attachments, special tests such as peeling and tearing can also be performed. The control system supports multiple control modes such as constant stress, constant strain, and constant displacement to meet the testing requirements of different standards. The intelligent safety protection system includes overload protection, travel limit protection, emergency stop and other functions to ensure the safety of equipment and operators.

Application areas: Wide coverage from basic materials to manufacturing

In the field of metal material research, testing machines are used to determine key parameters such as yield strength, tensile strength, and elastic modulus of metal materials. The aerospace industry uses it to test the mechanical properties of engine blades, structural components, etc. under abnormal conditions. The construction industry relies on testing machines for quality inspection of building materials such as steel bars, concrete, and cement. In the field of automobile manufacturing, it is used for performance verification of components and materials. In terms of scientific research and education, colleges and research institutions use it for material science research and teaching experiments. Quality inspection agencies regard it as an important means of product certification and quality supervision. With the development of technology, testing machines have also expanded to the testing field of new materials such as composite materials, plastics, and polymer materials. By adding environmental devices, mechanical performance testing can be carried out in high and low temperature environments.

With the development of the Internet of Things and big data technology, testing machines will achieve more intelligent data analysis and remote monitoring functions, providing stronger platform support for materials science research. The microcomputer controlled electro-hydraulic servo universal testing machine, as the core equipment for material mechanical performance testing, provides reliable testing methods for various industries through the combination of precision machinery, hydraulic transmission, and digital control technology. Its high precision, multifunctionality, and intelligence make it a modern industrial testing and scientific research tool. With the continuous advancement of technology and the expansion of application demands, this technology platform will continue to develop towards higher precision and stronger intelligence, providing stronger technical support for materials science and industrial quality control.