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Characteristics and differences between electronic universal testing machine and hydraulic universal testing machine
 Time: 2018-08-27   Views:

Electronic universal testing machine and hydraulic universal testing machine are relatively popular material testing machines, which can test various materials, including plastics, rubber, metal non-metal, etc., test materials tensile force, pressure and so on. The functions of these two types of universal machines are so similar, but there are two different models. What are their commonalities and differences?


First, from the structural characteristics:


The electronic universal testing machine mainly uses the servo motor as the power source, the lead screw and the silk nut as the executing components to realize the speed control of the moving beam of the testing machine. At present, there are mainly two forms, the timing belt and the speed reducer. Domestically, the test machine manufacturers in Changchun use synchronous belts, and the test machine manufacturers from Hongshan often use reducers. The advantages and disadvantages are not too obvious, and they do not affect the users. The electronic universal testing machines are all loaded on the force measurement. sensor.


Hydraulic universal machine, as its name implies, uses high-pressure hydraulic source as power source, manual valve, servo valve or proportional valve as control element for control. Ordinary hydraulic universal testing machine can only be manually loaded manually, which belongs to open-loop control system. The influence of the factors, the load cell generally uses a hydraulic pressure sensor. The electro-hydraulic servo universal material testing machine uses a servo valve or a proportional valve as a control element for control. Some domestic manufacturers have adopted high-precision load sensors for measuring force.


Second, in terms of performance:


The electronic universal machine does not need oil source, so it is cleaner and more convenient to use and maintain. Its test speed range can be adjusted. The test speed can reach 0.001mm/min-1000mm/min, and the speed ratio can reach 1 million times. The itinerary can be determined according to needs, more flexible, high precision of measurement, some can even reach 0.2%, small size, light weight, large space, convenient to add corresponding equipment to do various materials mechanical tests, truly a multi-purpose machine, At present, the electronic universal testing machine produced by the mainstream testing machine manufacturers in China can achieve the so-called three closed-loop control of load control, strain control and displacement control.


The hydraulic universal machine is limited by the flow rate of the oil source. Its test speed is low. The manual hydraulic universal testing machine is easy to operate and cheap, but the control precision is low. Electro-hydraulic servo universal testing machine, compared with the electronic universal testing machine, the control accuracy is not bad except for the low speed. The microcomputer-controlled electro-hydraulic servo universal testing machine with load sensor can also achieve the accuracy of about 0.5%. . And when doing large-tonnage material mechanics tests, it is more reliable, more stable, and more cost-effective.


 Third, from the scope of application:


Electronic universal testing machine, widely used in various metals, non-metal, composite materials, medicine, food, wood, copper, aluminum, plastic sheet, wire and cable, paper, film, rubber, prevention, aerospace and other industries The test of the performance index can be customized, and various experimental data processing software and test aids can be customized according to the domestic and international standards provided by the user. The digital display electronic universal testing machine is suitable for users who only ask for relevant data such as force value, tensile strength and compressive strength. If the demand is more complicated, the microcomputer-controlled electronic universal testing machine is a better choice for you.


Hydraulic universal testing machine


The hydraulic universal testing machine is mainly used for the mechanical properties test of tensile, compression and bending of metal and non-metal materials and parts, components and components. The hydraulic universal testing machine is industrial and mining enterprises, building materials, quality inspection center, water conservancy and hydropower, Ideal test equipment for bridge engineering, scientific research institutes, colleges and universities mechanics laboratory, manual control hydraulic universal testing machine, cheap, suitable for industrial and mining enterprises' finished product inspection, single material index test. The electro-hydraulic servo universal material testing machine is suitable for the test room with high requirements for steel and building materials inspection. The electro-hydraulic servo universal material testing machine of 30t or more has more price advantage than the electronic universal testing machine.