Hydraulic Technology Development Trend
Hydraulic technology is one of the key technologies to realize modern transmission and control. All countries in the world attach great importance to the development of hydraulic industry. Worldwide sales of hydraulic components total $35 billion. According to statistics, the sales of the hydraulic industry in the major countries of the world account for 2% to 3.5% of the output value of mechanical industry, but our country only accounts for about 1%. This fully explains thatthe utilization rate of our hydraulic technology is lower, expanding its application fields, and will have broad prospects for development.In the middle of twentieth century, the hydraulic industry began.
At present, the hydraulic technology is developing rapidly. At the early stage of development, the product only covers machine tools and forging and other places that need high-power machinery, and then it is used in construction machinery. From 1965, purchased from foreign country some hydraulic components and production technology, at the same time, designed hydraulic products by itself. The production of hydraulic components in our country from low pressure to high pressure and form its own series, at the same time, it is widely applied in all kinds of mechanical products. Then, it is accelerating the technical exchange of foreign excellent products, and designing domestically with the combination of foreign products, to ensure that our hydraulic technology can actively catch up with the world average level, and promote the overall industrialization process of our country.
On the premise of rapid and industrial development, scientific research institutions have been built in succession, and system construc tion has been promoted to optimize and upgrade the market. Under the promotion of the system, market enterprises can not only produce hydraulic pump, valve, motor and other hydraulic components, but also design many new hydraulic components, such as logic reversing valve, electrohydraulicproportional valve and so on. Now, the production of hydraulic components, our country has one set of completed series. The development of hydraulic is towards the direction of high quality, high performance and high efficiency.
After entering the 21st century, due to the wide application of computer, greatly promote the development of hydraulic technology, the application of computer hydraulic system assisted design, computer simulation and optimization, SCM control and other tasks, have achieved good innovation effect. At present, hydraulic technology in high pressure, high power, high efficiency, low pollution, low energy consumption and other aspects have made significant development,in digital control, proportional control and other technologies have new development achievements. In addition, in thehydraulic system computer simulation optimization and SCM control, and other aspects, increasingly show good results. Our country hydraulic industry now has all kinds of categories, excellent production ability, high technical characteristics. Nowadays, the national hydraulic industry has been able to provide a complete series of products for agricul ture, machine tools, ironmaking, petroleum, chemical industry, railway, shipbuilding, construction machinery, agricultural machinery and so on. At present, hydraulic components products have more than 1000 varieties, more than 1000 specifications. And, our hydraulic industry attaches great importance to technical exchange cooperation and economic association with foreign enterprises. In recent years, various foreign quoting components and hydraulic system play a very important role for our country's products in the improvement of technical level.
Hydraulic pneumatic technology has unique advantages, such as: hydraulic technology has a large power to weight ratio, small volume, high frequency response, pressure, flow controllability is good, flexible transmission power, easy to achieve linear motion and other advantages; Pneumatic transmission has the advantages of energy saving, no pollution, low cost, safety and reliability, simple structure, and easy to combine with microelectronics, electrical technology, form automatic control system. Therefore, hydropneumatic technology is widely used in various sectors of national economy.
As hydraulic technology is widely used in hightech achievements, such as: automatic control technology, computer technology, micro electronics technology, reliability and new process and new materials, so that the traditional technology has a new development, but also make the quality of products, the level has a certain improvement. In spite of this, the hydraulic technology towards the 21st century is unlikely to have a surprising technological breakthrough, should mainly rely on the improvement and expansion of existing technology, and constantly expand its application field tomeet the requirements of the future. Its main development trend will focus on the following aspects. Reducing losses and making full use of energy There is always energy loss in the process of converting mechanical energy into pressure energy and vice versa.
In order to reduce energy loss, the following problems must be solved:
Reduce internal pressure losses in components and systems to reduce power losses; Reduce or eliminate the throttling loss of the system to minimize the overflow flow that is not required for safety; Using static pressure technology and new sealing materials to reduce friction loss; Improve the performance of hydraulic system, using load sensing system, secondary regulation system and using accumulator circuit. Leakage control, leakage control includes: prevent liquid leakage to the outside caused by environmental pollution and external environment to the system damage two aspects. In the future, the development of non-leakage components and systems, such as the development of integrated and composite components and systems, the realization of pipeless connection, the development of new sealing and non-leakage pipe joint, motor oil pump combination device, etc. No leakage will be one of the important directions of the world hydraulic industry in the future.