1. In terms of structural characteristics:

　　The electronic universal machine mainly uses the servo motor as the power source, and the screw and screw nut as the executive components to realize the speed control of the moving beam of the testing machine. In terms of transmission control, there are currently two main forms, synchronous belt and reducer. Domestically speaking, testing machine manufacturers in Changchun mostly use timing belts, while testing machine manufacturers from Hongshan mostly use reducers. Regarding its advantages and disadvantages, it remains to be discussed, but none of them affect the user's use. In terms of force measurement, electronic universal testing machines use load cells.

　　The hydraulic universal machine, as the name suggests, uses a high-pressure hydraulic source as the power source. Use manual valves, servo valves or proportional valves as control elements for control. Ordinary hydraulic universal testing machines can only be loaded manually, which is an open-loop control system. Affected by price factors, hydraulic pressure sensors are generally used as force sensors. The electro-hydraulic servo universal testing machine uses servo valves or proportional valves as control elements for control, and some domestic manufacturers have also used high-precision load cells for force measurement.

　　Second, in terms of performance:

　　Electronic universal machine, no oil source. Therefore, 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. The speed ratio can reach as much as 1 million times. The test stroke can be determined according to the needs. flexible.

　　The precision of force measurement is high, and some can even reach 0.2%. Small in size, light in weight, and large in space, it is convenient to add corresponding devices to do various material mechanics tests. really did

　　One machine with multiple functions. At present, the electronic universal testing machines produced by domestic mainstream testing machine manufacturers 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, so its test speed is relatively low. Manual hydraulic universal testing machine, the operation is relatively simple, the price is cheap, but the control accuracy is low. Compared with the electronic universal testing machine, the performance of the electro-hydraulic servo universal testing machine is not bad except for the low speed. The microcomputer control of the load sensor is used to control the electro-hydraulic servo universal testing machine, and the force value accuracy can reach about 0.5%. . And it is more reliable, more stable, and more cost-effective when doing large-tonnage material mechanics tests.

　　Three, from the scope of application:

　　Electronic universal testing machine, widely used in various metals, non-metals, composite materials, medicine, food, wood, copper, aluminum, plastic profiles, wire and cable, paper, film, rubber, textile, aerospace and other industries It can test the tensile performance index, and can customize various test data processing software and test aids according to the domestic and international standards provided by the user. Digital display electronic universal testing machine is suitable for only seeking force value and tensile strength

　　Users of related data such as compressive strength. If you need to take more complex parameters, the microcomputer-controlled electronic universal testing machine is your better choice. In terms of cost performance, the electronic universal testing machine below 30T has more advantages.

　　The hydraulic universal testing machine is mainly used for tensile, compression, bending and other mechanical performance tests of metal and non-metal materials and parts, components and components. The hydraulic universal testing machine is an ideal test equipment for industrial, mining enterprises, building materials, quality inspection centers, water conservancy and hydropower, bridge engineering, scientific research institutes, and mechanical laboratories of colleges and universities. The manually controlled hydraulic universal testing machine is cheap and suitable for finished product inspection and single material index testing in industrial and mining enterprises. The electro-hydraulic servo universal material testing machine is suitable for steel and building materials with higher requirements.

　　Testing laboratories. Compared with the electronic universal testing machine, the electro-hydraulic servo universal testing machine above 30T has a price advantage.