Hydraulic universal testing machine, high pressure hydraulic source as the power source, the use of manual valve, servo valve or proportional valve as a control device to control the testing machine equipment, it is widely used in metal materials, tensile, compression, bending, shear test, Can also be used for cement, concrete and other non-metallic materials, compression and bending test. How to buy high-efficiency hydraulic universal testing machine? This is the need to be done some homework.

Hydraulic universal testing machine for metal materials under static force to stop tensile, compression, or bending test, can also be used for concrete and masonry and other construction materials of the test, and with bending accessories, and as a metal material process test. Now the common hydraulic universal test machine has manual hydraulic universal testing machine, digital hydraulic universal testing machine and electro-hydraulic servo universal testing machine.

Manual hydraulic universal testing machine; use simple high-pressure oil source as a power source, the use of manual control valve as a control element, manually through the manual test load, are open-loop control system. Due to oil source flow and host mechanism restrictions, its cylinder piston stroke is relatively small, generally about 300mm, the test speed is relatively small; by the price factor, most use of hydraulic pressure sensor.

Advantages: simple operation, low cost, experimental data show intuitive

Disadvantages: slow loading, low test efficiency, experimental results are not accurate, the test force is small.

Digital hydraulic universal testing machine: use precision high-pressure oil source as a power source, the use of servo valve or proportional valve as a control element for closed-loop automatic control, thus control performance is high, generally can achieve load, strain, displacement three control modes. By the four-column dual-screw cylinder under the host and the keyboard-type oil control cabinet components, use imported low-noise pump high-performance gear pump. The adjustment of the test space is achieved by the movement of the middle beam, and the middle beam up and down is used to drive the chain. Generally electronic pressure sensors are used to test experimental data

Advantages: simple operation, low cost, experimental data show higher accurate, intuitive and clear.

Disadvantages: experimental data show a single, can not show the test situation synthetically.

Electro-hydraulic servo hydraulic universal testing machine; using a high-pressure oil source as a power source, which uses a servo valve or proportional valve as a control element, the use of closed-loop active control, so its control function is higher, generally complete the load, displacement, strain three control methods. Electro-hydraulic servo testing machine big tonnage, strong bearing capacity, good load stability. Special software has a variety of control methods, which have the use of flexible, high function features.

Advantages: high degree of automation, through the computer set, the whole automatic control, good accuracy, the experimental data automatic statistical analysis, real-time display, can be arbitrarily enlarged display, and output print test report; different control mode can be smooth conversion.

Disadvantages: the cost is relatively high, only the test force of more than 30 tons of electro-hydraulic servo hydraulic universal testing machine cost is more prominent.

In summary, the three hydraulic universal testing machine has its own advantages and the scope of application, if you need to buy a hydraulic universal testing machine, please refer to their actual situation and then choose.