The WAW-2000B microcomputer controlled electro-hydraulic servo universal testing machine is integrated with the automatic control, automatic measurement, data acquisition, screen display and test results processing. The oil pump and the electro-hydraulic servo valve and the PC servo controller are configured to realize the multi channel closed loop control, and the test is completed. The function of automatic control and automatic measurement has the characteristics of good professionalism, high reliability and easy upgrading, and it can be perfected and perfected continuously with the development of test and control technology and the change of test standard.

1. Basic structure and main functions

1, host: configuration of the engine chassis under the oil cylinder, this structure greatly reduces the height of the host, convenient transportation, installation, stability and reliability. The test platform is driven by motor, chain and screw to realize the adjustment of the tensile space, and the test operation is convenient.

2, the measurement and control system is composed of electro-hydraulic servo oil source, full digital PC servo controller, electro-hydraulic servo valve, pressure sensor, extensometer, measuring displacement photoelectric encoder, special PC measurement and control card for test machine, printer, multi-function test software package, electric control unit and so on.

3. Standard electro-hydraulic servo oil source:

1) for the load adaptive oil intake speed control system, the mature technology is designed and manufactured according to the standard modular unit, which is specially used for the electro-hydraulic servo universal testing machine.

2) choose a mature oil pump (Italy) - motor with reliable quality and stable performance.

3) the load adaptive throttle speed regulating valve developed by its own technology, the system pressure stability, adaptive constant pressure differential flow regulation, no overflow energy consumption, easy to carry on PID closed loop control;

4) piping system: the pipeline, joints and seals are selected with stable package sets to ensure reliable sealing of the hydraulic system and no leakage of oil.

4. Electric control cabinet:

A, all the strong power components of the system are concentrated in the power control cabinet, which can effectively separate the strong power unit and the measurement and control weak unit, and ensure that the measurement and control system is not disturbed, and the work is stable for a long time.

Manual operation buttons are installed on B and electric cabinet, including power switch, emergency stop and oil source pump stop and so on.

5. The full digital PC servo control system:

A) the system uses the PC computer as the main body, the full digital PID adjustment, the PC card type servo amplifier, the measurement and control software and the data acquisition and processing software, which can realize the closed loop control of the test force, the specimen deformation, the piston displacement and the smooth switching of the control mode.

B) the system consists of three signal conditioning units (test force unit, cylinder piston displacement unit, specimen deformation unit), control signal generator unit, servo valve drive unit, servo oil source control unit, necessary I/O interface, software system and so on.

C) closed loop control loop of the system: measuring sensors (pressure sensors, displacement sensors, deformable extensometer) and servo valves, controller (each signal conditioning unit), servo amplifier together to form a number of closed loop control circuits, to achieve the test machine test force, oil cylinder plug displacement, sample deformation of the closed loop control function; It has a variety of control modes such as constant rate test force, constant rate oil cylinder displacement, constant rate strain and so on, and can realize smooth switching of control mode, so that the system has greater flexibility.

6. The special PC card servo amplifier for the test machine:

A, for pluggable PC card board, the application of advanced computer bus control technology for the test machine design, programmable analog amplifier, A/D conversion, digital acquisition channel, digital quantity I/O and so on.

B, the special measurement and control card and the PC machine form a single card measurement and control system, can directly connect with the sensor, carry out measurement and control and data acquisition, so that the complex measurement and control and data acquisition system becomes simple and reliable.

C, using computer bus technology, inserting directly into the expansion slot of the computer, all digital circuits, zero adjustment, gain adjustment and so on are realized by software. It is the latest product unit for the development of test and control technology.

D and gain programmable cascade amplifier can get magnification of different gain.

E, sensor supply bridge power supply and A/D chip base voltage share the same voltage, the whole measurement system attenuates year-on-year, and realizes the hardware compensation technology for the power supply of the bridge.

F, through multi bit A/D conversion to meet the sensitivity and resolution requirements of the system, avoid the software frequency doubling method to reduce the characteristics of the system.

7. Multifunction test software package:

A, operating system Windows98/XP/2000 platform, full Chinese operation interface;

B, computer screen display test force, oil cylinder displacement, loading rate, deformation test data, draw time - test force / deformation, deformation - test force and other test curves; automatic data processing, data processing method is full

GB228-2002 standard requirements, such as the upper and lower yield point, the maximum point of force, all kinds of non proportional stress points, all kinds of provisions full stretch stress point, and meet the test machine pressure test requirements at the same time;

C and software provide data analysis function at the same time, and satisfy the test data analysis and special test data processing.

D, has strong graphic operation functions, such as dynamic test curve and digital display function, graphics magnification, interception function, cursor follow display function, etc.

E and VXDs high-speed data acquisition technology are used to achieve high speed data acquisition of multi-channel (up to 16 channels).

F, the system has complete file operation function to store the test curve and test data. At the same time, the test data can be stored in the form of ASCII code to facilitate the user to carry out two data processing.

G, with single test report output and batch test report output printing function;

8. The control system has the functions of overload, over setting, power failure, piston reaching the limit position and so on.

9. Hydraulic clamping oil source: independent low noise hydraulic clamping oil source, controlling clamping and loosening of chuck.

Two. The main technical indicators:

1. The maximum test force: 2000kN;

2. The range of test force measurement: 2% - 100%FS;

3. The accuracy of the test force shows: the accuracy of the indication is 1%.

4. Maximum stretch space: 800mm;

5, the maximum compression space: 600mm;

6. The thickness of the flat specimen is 0~50;

7. The diameter of the round specimen is: 20 ~ 70;

8, the maximum distance between the bending support: 600mm;

9, the precision of piston displacement is: + 0.5%FS.;

10, the resolution of the deformation measurement: 0.001 mm;

11. The precision of deformation measurement: 1%;

12, sensor: oil pressure sensor, photoelectric sensor;

13, the control mode is electro-hydraulic servo closed loop control, and the control mode can be smoothly switched.

14, display mode: computer screen display test force, piston displacement, sample deformation measurement value, screen display test curve, screen zero adjustment, calibration;

15. The size of the host: About 1200mm x 850mm x 2900mm;

Control cabinet size: 1150mm x 665mm x 860mm;

16, the weight of the host: about 7000kg;

17. Total power: 6kW.

Three. The main configuration list:

1. A universal hydraulic testing machine.

2. Standard oil source for hydraulic universal testing machine.

3. Electro hydraulic servo digital PC controller (including computer).

4. A special PC control card for testing machine.

5. One printer.

6. An electro-hydraulic servo valve.

7. Electrical control box (integrated with oil source)

8. A pressure sensor.

9. Cylinder piston displacement sensor and connector set.

10. Full digital servo control software.

11. Multi function test data processing software package (including common test software for tension and compression).

12, a set of pipelines

13. A set of attachments (tensile, compression, bending, shearing and installation spare parts).

Ji'nan Heng Xu Test Machine Technology Co., Ltd.

Phone: 0531-85860713

Fax: 0531-85860723

Tang Xueying: 15508660930