Discussion on the technology of pressure and water hydraulic linkage
Discussion on VdH3 Pressure and Water Hydraulic Linkage Technology of Journal of Southern Institute of Metallurgy Yuan Shengfa Department of Mechanical Engineering, Southern Metallurgy College. The feasibility and necessity of Jiangxi Zhangzhou 341 pressure linkage.
1 Pneumatic technology application research automation technology has been more and more widely applied to all walks of life. At present, the technical means of realizing industrial automation is nothing more than two human beings are electrical and electronic controls. Body power control. The pneumatic technology in fluid power control is the door technology of power transmission and engineering control using jade gas as working medium. The commonly used compressed air source is convenient, can be directly discharged into the atmosphere after use, does not pollute the environment; the air has little flow loss in the pipeline and can be transported from a long distance; the compressed air is convenient for storage; the pneumatic component is simple and compact, easy to manufacture and maintain, so the pneumatic is The best way to achieve low cost automation. The pneumatic system has developed rapidly in the harsh occasions such as flammable and explosive dust, strong magnetic humidity and large temperature, corrosive gas, etc., reliable and safe operation, long service life, and high speed and high adaptability. Pneumatic technology has become the number and level of modern transmission and control, and has become an important indicator to measure the technical level of a country.
According to the information, the current pneumatic technology is widely used in various parts of the internal economy, and the application of the spectrum is becoming more and more extensive. Now, for example, most production departments with pipeline production processes can use the gas soul, such as the non-ferrous metal smelting industry. . In the smelting industry, when the temperature is high and the dust is high, it is often not suitable to use motor drive or hydraulic drive. It is safer and more reliable to use pneumatics. For example, the opening and closing of the blast furnace door is often done pneumatically.
In the light industry, electrical control and pneumatic control applications are roughly equivalent. Where the output force requirements are not too smooth, or the control accuracy requirements are not too high, pneumatics can be used, and the cost is much lower than that of electrical devices. For viscous liquids such as toothpaste cosmetic paints and inks, pneumatics are used for automatic metering and filling, which not only improves work efficiency, reduces labor intensity, but also is safer to use due to the volatility and flammability of some liquids. For the food industry, the pharmaceutical industry, the cigarette industry and other fields, pneumatics have stronger advantages due to their non-polluting properties, and have broad application prospects.
In the military, the pneumatic industry is also widely used. Electronic equipment 1 is difficult to work under island temperature conditions of more than 3 without cooling. Therefore, modern aircraft rocket missile torpedoes and other automatic devices are mostly pneumatic, because compressed air is used as the power source, and its volume is 1 kg or even smaller. The energy battery is still small and not afraid of electronic dry.
2 The necessity of gas-liquid linkage and gas-water hydraulic linkage is the same as the compression air working pressure, so the output force and torque are not too large; the air has compressibility, so the stability of the movement speed is poor, and the positioning accuracy is not high. In order to improve its positioning accuracy and smoothness of movement, and to take advantage of aerodynamics, it is possible to consider the introduction of an incompressible liquid as a working medium to improve the performance of the system, that is, the so-called liquid-liquid linkage is currently the liquid working medium for common applications. Petroleum type, commonly known as hydraulic oil. In the early 20th century, the rise of the oil industry and the emergence of oil-resistant synthetic rubber promoted the use of hydraulic oil transmission for most hydraulic technology. Hydraulic oil has good environmental protection, flame retardancy, compatibility with the production environment, and sustainable development. Water is an ideal working medium. First, the cost of water is low. There are few substances on the earth that are rich in water and practical, except for the air, and it is desirable to use it. It does not have the smelting of liquid sputum oil, and the treatment of pure transportation warehousing waste liquid. The first can avoid pollution. The environmental pollution of hydraulic oil is well known. The leaked oil can cause the surrounding plants to die, the ground to slip, and the air to become odorous. In the food and pharmaceutical manufacturing, wood processing furniture manufacturing and other industries, the leakage of oil will make food and medicine taste, so that the wood plywood stains the paper textiles, so that many products can not be produced at all. Water is used as the hydraulic medium, just like the air sample. There are no pollutions or hazards to the environment and products, and no recycling is required. First, in a high temperature environment, water is not flammable and very safe. Water is non-toxic and non-compressible. The compressibility and thermal expansion coefficient of water are only 14 and 12 respectively of hydraulic oil. Therefore, using water as the medium can make the control system achieve more precise positioning and more stable static and dynamic performance of the soul system. it is good.
In short, pneumatic and water hydraulic linkage, not only low cost and no pollution, can achieve sufficient driving force, and the movement speed and output force are evenly adjustable to play their strengths, make up for their respective disadvantages, and have a wider application prospect.
3 Principle of gas-liquid linkage Introduction Gas-liquid damping cylinders are the first to apply gas-liquid damping cylinders for gas-liquid linkage. It is divided into several types, such as series parallel type and floating type.
1 is the principle of series gas-liquid damping cylinder and its regulation characteristics. It is actually a double-acting double-acting cold cylinder. The two pistons are connected in series using one live cold rod. The output force of the piston 圮 the difference between the thrust or tension of the cylinder and the resistance of the cylinder. The cylinder is mounted on the cylinder 6 and he is driven by the 4 cylinder. The movement violation is adjusted by the opening of the pan adjustment throttle.
1. Movement mechanism; 2 water chamber; 3. Hydraulic one-way throttle valve; 4. Hydraulic one-way valve; in actual work, the pressure should be higher than 1 state 1 pressure. At this time, the small air compressor can't do anything. It is often not necessary to purchase a high-pressure air compressor. At this time, gas-liquid and pressure cylinders can be used to achieve higher pressure.
The area of ​​the cylinder piston is larger than the area of ​​the cylinder piston to obtain a larger thrust.
The gas-liquid converter is a unit that converts air pressure into hydraulic pressure. 1. a gas-liquid transmission cylinder; 2. a moving mechanism; 3. a hydraulic one-way throttle valve; a member of the three, 4. a boost ratio of 1 as an accessory group. 4 gas-liquid supercharged lack; 5. electromagnetic pneumatic reversing pottery 6. The gas source enters the pneumatic system, which can eliminate the crawling and instability phenomenon in the low-speed movement of the pneumatic circuit, and can be combined with various pneumatic components. The middle left is a one-way throttle speed control loop, and the right is a two-way throttle speed control loop. The latter has a higher stability.
4 Pneumatic and water hydraulic linkage problems to be solved Air pressure transmission is used for fast transmission. It is not afraid of the field where the impact speed is not strict. The hydraulic transmission is stable with the corpse transmission, and the field must be controlled. The power source of the gas-liquid linkage system is compressed air. For pneumatic and water liquid jade linkage. The following key problem leakage should be resolved. Since the viscosity of water is low, it is larger than the leakage of oil under the same sealing gap. This can be reduced by designing and manufacturing very small components that seal the gap, or by using special shapes.
lubricating. Since water is weakly lubricious, it is difficult to form a lubricating film and it is easy to generate dry friction. This requires the use of special materials such as engineering plastics and ceramics in the manufacture of components, and the processing accuracy is also higher. These problems are related to the development of water-liquid card technology. With the completion of water and liquid, the pneumatic and hydraulic coupling technology will surely have a wider range of applications.
1. Gas-liquid transmission cylinder; 2. Movement mechanism; 3. Hydraulic one-way throttle valve; 4. Gas-liquid converter; 5. Electro-pneumatic reversing valve; The hydraulic engineering manual is called. Beijing Mechanical Industry Press, 1990.
Zhang Hongjia, Huang Yi. Hydraulic drive èš“. Beijing Mechanical Industry Press, 1993.
Through the author's practice, the above methods are generally regarded as the most practical with the backup reduction method and the restoration card protection. Of course, it is the computer room machine of the base network, and the computer room local feather, the staff, 1 minute 36161.12 guest body The end server is widely used as an auxiliary segment.
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