Abstract: This article introduces some research results of hydraulic technology in the field of science and technology today and its future development trends and requirements from different aspects. It is pointed out that hydraulic transmission is moving forward in a state of high efficiency, low consumption, high quality and less inferior quality, more advantages and less deficiencies. This is also the most important direction to strengthen its own capabilities and advantages.
Keywords: Development Trend of Hydraulic Technology Research Results
CLC Number: TH137 Document Identification Code: A Article Number: 1672-3791(2012)05(b)-0110- 01 Hydraulic technical equipment has been greatly improved in recent years, especially in such an era of electronic information development and network control, the levels and scope it can cover are becoming more and more extensive. Scientifically speaking, it is actually a power structure between electronics and machinery. Combining mechanical power and electronic control is an inevitable result of the development of hydraulic technology.
This article will give a detailed introduction to hydraulic technology from some current research results and future development trends, including the current status of hydraulic technology, the control theory of fluid transmission, and the development trends and prospects of hydraulic technology. .
1 Current status of hydraulic technology
Hydraulic technology in the modern sense is generally believed to have appeared at the end of the 18th century. In 1795, the United Kingdom manufactured the world's first industrial equipment hydraulic press. At the end of the 19th century, Germany had manufactured a hydraulic gantry planer, and the United States had also created a hydraulic hexagonal lathe and a hydraulic grinder. However, the original parts were immature at that time and the hydraulic technology had not been developed widely. As an important branch of modern industry, hydraulic transmission technology has developed greatly and should be mastered in the 20th century.
2 Related content of hydraulic technology
2.1? Hydraulic components
The results achieved by using hydraulics include the following points.
(1) Miniaturization transformation of component structure.
The miniaturization of the component structure greatly reduces the power required by the solenoid valve, which is more suitable for the operation of the machine and can also reduce power consumption. The diversity of component functions itself, when used in the process, makes the operation of other machinery more flexible and convenient.
(2) Energy saving.
Variable pumps have been relatively widely used. In terms of current technology adoption of variable technology, quite a number of uses of variable laws have been devised. Reducing energy consumption and extending the life cycle are also issues that must be discussed. The current frequency conversion operation has attracted much attention and recognition. It has always been an idea to realize the mutual transfer function between energies through energy conservation. And should be subject to continuous research and discussion.
(3)Investment of new raw materials.
The use of new materials such as ceramic technologies interacts with the non-mineral component elements themselves and the frictional life cycle. At present, this project has been widely adopted in developed regions such as Europe and the United States. The addition of new raw materials plays a decisive role in improving the properties of solenoid valves and proportional valves. Due to the improvement of the performance of the solenoid valve, the thrust of the valve can be greater, which directly makes the workload that the valve can control greater, the efficiency higher, and the function more expressive.
2.2? System integration and control technology
(1) Proportional valve technology.
The development of proportional valves mainly focuses on increasing the bandwidth and improving control accuracy, in order to achieve performance close to that of servo valves. At the same time, proportional valves are developing in the direction of standardization, modularization and low cost to promote their application. The former, such as Bosch's proportional servo valve with position feedback, has a performance that is very close to that of an electro-hydraulic servo valve. The latter, such as threaded cartridge proportional valves, are used in some construction machinery.
(2)Electro-hydraulic servo technology.
Electro-hydraulic servo valves are the first to introduce hydraulic technology into the field of automatic control. However, the structure of the electro-hydraulic servo valve has rarely been improved since its invention. In addition to traditional occasions that require particularly high frequency response, its traditional status is increasingly challenged by proportional technology. MOOG has also begun producing direct drive servo valves (DDV) using permanent magnet linear force motors, similar to proportional valves.
(3) Control theory.
Cybernetics is the more accomplished part of the academic community. Hydraulic technology obtains the theoretical summary of control through the practical process of machinery, and then provides new guidance based on the theoretical summary.
Currently, these technologies have been used in medicine and many medical devices.
2.3? Sealing technology
Since the birth of hydraulic technology, leakage has been a major problem that has plagued people in the industry. Accompanying the leak is the possibility of leakage of minerals and threats to the environment.
3 The future of hydraulic technology is expected
With the widespread use of hydraulic technology, such as the adoption of computer control, electronic technology, control system internals, and new processes, it has already With the rapid development trend, both in terms of quality and performance are very obvious. Although there has been considerable development at present, there are still some limitations, so we should continue to open up new areas and develop different levels of capabilities to better adapt to its expectations. The more important development trends will focus on the following aspects.
3.1? Mechatronics
Hydraulic technology, as a branch of transmission and control, cannot be treated in isolation. It cannot be opposed to other electromechanical technologies. Hydraulic devices can actually be considered as mechanical components. It is an important interface between power and electricity and an ideal power amplification link. Especially when high power output and flexible and convenient control are required, there is currently no better alternative technology. Hydraulic transmission + electronic control has become an inevitable trend of development.
3.2? Hydraulic CAD technology
By establishing a redevelopment system for the current hydraulic CAD design software, and building an information-integrated system control range to achieve development-manufacturing- A closed process of sales-use-development. And in the actual control process, computer technology is integrated into it, so that before the actual control is carried out, relevant rehearsal work can be carried out to ensure the greatest possibility of achieving the goal. The second thing to do is to use CAD technology to maintain the entire process of hydraulic series products, integrate CAD/CAM/CAPP/CAT into the modern management system, and design a network master control system (CIMS). It can make a certain leap in hydraulic technology and control technology.
3.3? New raw materials and new processes
As an important branch of modern industrial technology, the development of hydraulic technology and hydraulic components cannot be carried out in isolation, especially material technology , processing technology has a more important impact on its development. The replacement of new process materials, such as the application of ceramics, rubber, etc., can also be successful in hydraulic technology. Comparing the pilot reversing valves with the same flow and pressure levels in 1959 and 1995, the main values ??were 120kg and 12kg respectively, a difference of 10 times. The operating pressure of today's most advanced hydraulic pumps has reached 50MPa.
4 Conclusion
In recent years, due to the integration of electronic technology into hydraulic technology, the rotation of liquid has been strengthened, giving hydraulic technology new power and mechanical performance. . By following the processing method of electronic input, we will definitely be able to win over the mechanical and electrical markets, and we will continue to adopt computer control, electronic technology, control system internals, and new processes. We have demonstrated superiority in operation and control as well as in the work process. Hydraulic technology has become the new driving force of modern power due to its high efficiency, low loss, large power, low resistance and low noise, and has continuously developed broader market competitiveness and maintained a constantly updated technical level.
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