Electro-hydraulic servo system has many advantages, among which the most outstanding ones are the fast response, large output power and high control precision, so it has been widely used in the fields of aviation, aerospace, military, metallurgy, transportation and construction machinery. Although the human use of hydraulic machinery and hydraulic transmission has a long history, but the rapid development of hydraulic control technology is still in recent decades, with the birth of electro-hydraulic servo valve, hydraulic servo technology into the era of electro-hydraulic servo , Its application has also been widely expanded. With the development of modern science and technology, especially material science, people pay more attention to dynamic experiments. The electro-hydraulic servo technology is the best technical means to achieve dynamic high cycle fatigue, programmed fatigue and low cycle fatigue as well as static constant deformation rate, constant load rate and various simulation test systems. The beginning of the domestic electro-hydraulic servo testing machine Foreign testing machine counterparts in the electro-hydraulic servo technology and research and development started earlier, since the mid-20th century since the mid-50s has produced a variety of electro-hydraulic servo testing machine, such as the United States MTS, Britain Instron, Switzerland Amsler, Germany Sehench and Japan Shimadzu have successfully developed a variety of electro-hydraulic servo testing machine. At that time, our country was still blank in this field of application. The electro-hydraulic servo testing machines used were all imported from these countries. China's testing machine manufacturers in the early 1970s began to develop electro-hydraulic servo testing machine, Changchun Institute of Testing Machines, Changchun Machine Factory, Hongshan Machine Factory and Jinan test machine factory began to develop. With the support of national financial resources, we have successfully developed electro-hydraulic servo static and dynamic testing machine and started to apply it in China. It is through the successful practice of that time, train a group of technicians to train and create a platform for the future development of electro-hydraulic servo technology in our country, laying the foundation for this technology in China. Development stage of domestic electro-hydraulic servo testing machine The development of domestic electro-hydraulic servo testing machine is roughly divided into two stages according to the characteristics of the product development period: the independent development stage and the stage of cooperation and development with foreign countries. Independent development stage: from the late 1970s to the early 1990's, the domestic electro-hydraulic servo testing machines are based on independent development. Mainly concentrated in several domestic strength testing machine manufacturers, such as Changchun Institute of Testing Machines, Changchun Machine Factory, Hongshan Machine Factory and Jinan test machine factory and so on. The main representative products of this period are: 2000kN electro-hydraulic servo rock pressure testing machine developed by Changchun Testing Machine Research Institute in 1983, which uses high-pressure vessel as confining pressure to simulate the real force condition of the sample. Is a three-axis static and dynamic testing machine representative products, and for the first time the computer into the electro-hydraulic servo testing machine control. 1984 Changchun Institute of test machine developed 3000kN electro-hydraulic servo two-cylinder horizontal tensile testing machine. The project for the first time using static pressure support technology, successful in two horizontal servo cylinder hydrostatic support. In addition, the servo synchronization technology is also applied for the first time to realize synchronous tracking and precise positioning of a two-cylinder system. Double-cylinder synchronization accuracy reached 0.03mm. The product marks the domestic hydrostatic support technology and dual-system synchronization technology has matured. 1987 Changchun Institute of Testing Machine developed 1MN electro-hydraulic servo large-scale structural testing machine, which was developed at the time of the largest tonnage of electro-hydraulic servo testing machine. 1986 Changchun Institute of Testing Machine developed a small random electro-hydraulic shaking table. 1985 Changchun test machine factory developed 200kN electro-hydraulic servo static and dynamic testing machine, the first time in China using high pressure toothless chuck and beam prestressed locking technology. Is the standard representative of static and dynamic testing machine products. Hongshan test machine factory over the same period has developed the first pulling torsion electro-hydraulic servo static and dynamic testing machine, for the first time set tension and torsion test in one. The product marks the domestic pull torsion sensor technology, torsion swing cylinder technology and pull torsion synthesis test technology has begun to apply. The technical characteristics of the electro-hydraulic servo testing machine developed and produced in this period are as follows: In the measurement and control system, with the development of digital circuit technology and computer technology, the development from analog control to analog-digital mixed control is started and computer technology is applied Control system. The servo synchronization technology is applied to realize the synchronous tracking and precise positioning of the two-cylinder system. Developed a low damping, high response, long life hydrostatic support dynamic servo cylinder. The use of booster technology to achieve high-pressure toothless chuck and beam prestressed locking. The technical characteristics of these products at the time of the development of electro-hydraulic servo technology, are more advanced. Cooperation and Development Phase with Foreign Countries In the 1990s, with the acceleration of China's reform and opening up, the links between the domestic testing machine manufacturers and their foreign counterparts became closer. Both parties began to seek ways of cooperation for their respective interests. In the meantime, Changchun Testing Machine Co., Ltd. formally signed a technical cooperation agreement with MTS Company of the United States in 1989 and entered into substantive implementation stage in 1993. In addition, the Changchun Testing Machine Factory began technical cooperation with the United Kingdom Tattech Company, the Jinan Testing Machine Factory and Japan's Shimadzu, and the Hongshan Testing Machine Factory contacted the British company Instron during the same period. In short, this period is the period when several major pilot machine factories in China are seeking cooperation with foreign countries. This period of the electro-hydraulic servo testing machine product varieties is the most complicated; domestic products with independent property rights, the introduction of technical cooperation in the production of products, as well as foreign technology domestic production of products. The testing machine manufacturers products represent the characteristics of their respective manufacturers, testing machine in the domestic market started a contest. After entering the domestic testing machine industry and international cooperation and development period, in the face of foreign advanced technology, but did not forget to improve their own technology. In this regard, many outstanding domestic enterprises have always insisted walking on two legs. On the one hand, it is bold to introduce advanced foreign technologies and take the road of technical cooperation
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