Microcomputer-controlled electro-hydraulic servo universal testing machine

Testing machine

The microcomputer-controlled electro-hydraulic servo universal testing machine adopts a double-space oil cylinder lower structure. There is a compressed space between the test bench and the lower beam, which can realize the compression, bending, shearing and other tests of the sample; There is a tensile space between the lower beam and the upper beam, which is mainly used for the tensile test of the sample. The test space is automatically adjusted by rotating the lead screw to drive the lower beam up and down. The closed-loop servo control system composed of electrical controller, servo valve, load sensor, displacement sensor, extensometer and computer can automatically and accurately control the test process and automatically measure the test force, displacement, deformation and other test parameters.

This testing machine is mainly used for tensile, compression, bending, shear and other tests of metal materials; It can realize the tests of constant rate loading, constant rate deformation and constant rate displacement, and realize the three-stage control of force, deformation and displacement in one test, and the smooth switching between each control can be achieved.

Through computer acquisition and software processing, the test process can be automatically controlled and the test results can be automatically obtained. The test curve and test results are displayed in real time by the computer screen, and the test report and test curve are printed by the printer.

The test data can be transmitted to the network through the data interface. Relevant requirements: our software can provide the network interface in advance according to the user's specific requirements; If it involves sending software personnel to the user's site for service, corresponding fees shall be charged; We only assist users in networking work, and do not assume the responsibility of negotiation and coordination with relevant network companies.

1.Metallic tensile test: meet the requirements of GB/T 228.1-2021 Metallic tensile test. The electrical system has three control modes: force control, deformation control and displacement control. During the test, the three control modes can be switched smoothly according to the set procedure. The software can automatically calculate ReH (upper yield strength), ReL (lower yield strength), Rp0.2 (specified non-proportional extension strength), Rt0.5 (specified total extension strength), Rm (tensile strength), E (elastic modulus) and other parameters.

2.The user can additionally configure the fixture to complete the tests specified in other standards.

3.It can realize constant rate loading test, constant rate displacement test, constant rate deformation test and test force retention test.

1. The main engine adopts streamlined appearance design, the oil cylinder is placed underneath, the design strength of each component is reasonable, the overall combination is scientific, atmospheric and beautiful, and the painting process is independent. The painting effect and color can be customized according to the customer's needs to match the customer's on-site environment；

2. The coaxiality between the center line of the upper and lower collets and the tensile axis of the testing machine is 8% (much better than the requirement of less than 15% in the national standard)；

3. The clamping of the sample is hydraulically driven, and the upper and lower beams are equipped with built-in clamping small oil cylinders, which are safer, more reliable, longer service life, no oil leakage and beautiful appearance than the external clamping oil cylinders.

4. The sample clamping force increases with the increase of the test force, and the sample is firmly clamped；

5. The new dovetail jaw clamp is fast and convenient for sample centering, which greatly increases the service life of the jaw clamp；

6. The new dovetail jaw is completely combined with the joint surface of the clamp plate to avoid the free sliding of the jaw during the experiment；

7. Damping and noise reduction device: the lower end of the lead screw sprocket is equipped with a damping and noise reduction device, which can effectively cushion the impact force and thus reduce the noise；

8. The floating automatic alignment design of the cylinder ball head makes the equipment more stable during the test operation and ensures the coaxiality of the mechanical part；

9. The clearance elimination structure effectively eliminates the gap between the tension nut and the lead screw, so that a certain preload is generated between the tension nut and the drive lead screw, ensuring the synchronization of the force and the neutral of the sample, and avoiding the inclination of the moving beam during the stretching process；

10. The hydraulic system adopts servo closed-loop control and is equipped with highly responsive imported servo valve, which can realize fully automatic and accurate control；

11. The hydraulic system is designed with full consideration of energy saving, reliability, safety and environmental protection. The differential pressure throttle speed regulating servo servo servo system is adopted. The system working pressure is automatically adjusted with the change of load, reducing the system heating and saving energy. All components adopt components that meet environmental protection requirements；

12. High-pressure gear pump and motor are directly connected, with compact structure, stable operation and noise lower than 70dB；

13. After random calibration, the test will not be affected by external forces, which can ensure the accuracy of the test process and parameters. The stress direction of test sensors such as tension and compression is consistent. Simple and convenient calibration；

14. Select high-quality high-pressure hose and connector body to ensure no leakage；

15. The external type plus external controller, combined with linkage control, greatly improves the speed of communication and the stability of the system, avoids the mutual interference of a single controller, configures a high-performance intelligent all-digital controller, adopts all-digital PID regulation, and is equipped with independent servo amplifier, measurement and control software, and data acquisition and processing software, which can realize a variety of closed-loop control modes such as constant rate test force, constant rate cylinder displacement, constant rate strain, etc, And realize smooth switching of different control modes；

16. The measurement and control system is equipped with multi-function test software package, which adopts VXDs high-speed data acquisition technology to realize high-speed acquisition of multi-channel data; It can analyze and process test results according to different test methods, and has human-computer interactive programming control function to facilitate the addition of new test standards; With powerful graphic operation function, it can display and draw the test curve and display the test data in real time. It has the functions of curve zooming, graph zooming, intercepting, and cursor following display. It has complete test curve and test data storage function; It has the function of single piece test report output and batch test report output printing；

17. It has network interface, which can realize data networking and remote control functions. The experimental data is compatible with multiple networking software, which is convenient for customers to upload and collect networking data in the later stage. At the same time, the software also has the function of reading data through LAN connection；

18. Safety protection device: it has protection functions such as test force overload, over-setting, power-off, and piston reaching the limit position.

19. Hardware protection device：

20. Lower beam upper and lower limit protection, piston rising limit protection, overvoltage and overcurrent protection, hydraulic system equipped with safety valve to ensure that the system pressure does not exceed 25MPa；

21. Software protection device：

22. Overload and anti-collision protection, full code protection, and protection of calibrated dynamometer during verification；