1、 In terms of structural features:
The electronic universal testing machine mainly uses servo motor as power source, screw and screw as executive parts to realize the speed control of moving beam. In the transmission control, there are mainly two forms, synchronous belt and reducer. In China, the testing machine manufacturers in Changchun area mostly use synchronous belt, while the testing machine manufacturers from Hongshan mostly use reducer. Its advantages and disadvantages need to be discussed, but they do not affect the use of users. In force measurement, load sensors are used in all electronic universal testing machines.
Hydraulic universal testing machine, as the name implies, uses high-pressure hydraulic source as the power source. Manual valve, servo valve or proportional valve are used as control elements. Ordinary hydraulic universal testing machine can only be loaded manually, which belongs to open-loop control system. Due to the influence of price, the force sensor generally adopts hydraulic pressure sensor. The electro-hydraulic servo universal material testing machine uses servo valve or proportional valve as control element. Some domestic manufacturers have also used high-precision load sensor to measure force.
2、 In terms of performance:
Electronic universal testing machine, no oil source. Therefore, it is cleaner, 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 1 million times, and the test stroke can be determined according to the needs, which is more flexible. The accuracy of force measurement is high, some even reach 0.2%. It is small in size, light in weight and large in space. It is convenient to add corresponding devices to do various material mechanical tests. It really achieves the multi-purpose of one machine. At present, the electronic universal testing machines produced by domestic mainstream testing machine manufacturers can achieve load control, strain control, displacement control, so-called three closed-loop control.
Hydraulic universal testing machine, limited by the flow of oil source, its test speed is low. Manual hydraulic universal testing machine is easy to operate and cheap, but its control precision is low. Compared with the electronic universal testing machine, the performance of the electro-hydraulic servo universal testing machine is lower than that of the electronic universal testing machine, and the control accuracy is not poor. The force accuracy of the electro-hydraulic servo universal testing machine controlled by the microcomputer with the load sensor can also reach about 0.5%. It is more reliable, more stable and cost-effective in large tonnage material mechanics test.
3、 In terms of application scope:
Electronic universal testing machine is widely used in various metal, non-metallic, composite materials, medicine, food, wood, copper, aluminum, plastic profile, wire and cable, paper, film, rubber, textile, aerospace and other industries to test the tensile performance index. At the same time, it can customize various test data processing software and test auxiliary according to the domestic and international standards provided by users Yes. The digital display electronic universal testing machine is suitable for users who only calculate the force value, tensile strength, compressive strength and other related data. If you need more complex parameters, the microcomputer controlled electronic universal testing machine is your better choice. From the cost performance point of view, the electronic universal testing machine below 30t has more advantages.
Hydraulic universal testing machine is mainly used for tensile, compression, bending and other mechanical properties tests of metal, non-metallic materials and parts, components and components. Hydraulic universal testing machine is an ideal test equipment for industrial and mining enterprises, building materials, quality inspection center, water conservancy and hydropower, bridge engineering, scientific research institutes, and Mechanical Laboratory of colleges and universities. Manual control hydraulic universal testing machine, cheap, suitable for industrial and mining enterprises finished product inspection, single material index test. However, the electro-hydraulic servo universal material testing machine is suitable for the testing laboratory of steel and building materials with high requirements. Compared with the electronic universal testing machine, the electro-hydraulic servo universal material testing machine has more price advantages