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The future development trend of electro-pneumatic products such as valves

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With the continuous improvement of the degree of production automation, the application of pneumatic technology has expanded rapidly, the variety and specifications of pneumatic products have continued to increase, the performance and quality have been continuously improved, and the market sales value has increased steadily.


With the continuous improvement of the degree of production automation, the application of pneumatic technology has expanded rapidly, the variety and specifications of pneumatic products have continued to increase, the performance and quality have been continuously improved, and the market sales value has increased steadily. The development trend of pneumatic products is mainly in the following aspects:
1. miniaturization and integration
Limited space requires the size of pneumatic components as small as possible, miniaturization is the main development trend. At present, the minimum cylinder inner diameter is only f2.5, and switches are prepared. The solenoid valve has a width of only 10mm and an effective cross-sectional area of 5mm2. The pressure reducing valve with interface f4 has also been developed. According to the survey, the demand for miniaturized components is about doubling every five years.
The integration of the valve is not only a few valve assembly, but also maintenance and reliability of the work.
2. combination and intelligence
The simplest combination of components is the cylinder with valve and switch. In material handling, a combination of air cylinder, swing air cylinder, pneumatic chuck and vacuum suction cup has been used; there is also a combination of moving small items, which combines two air cylinders with guides according to X and Y axes respectively. It is also equipped with solenoid valve and program controller, which has compact structure, small space occupation and adjustable stroke.
3. precision
In order to make the positioning of the cylinder more accurate, the use of sensors, proportional valves and other feedback control, positioning accuracy of 0.01mm.
In terms of cylinder precision, 0.3 mm/s low-speed cylinder and 0.01N micro-load cylinder have also been developed. In the gas source treatment, a filter with a filtration accuracy of 0.01mm and a filtration efficiency of 99.9999% and a pressure reducing valve with a sensitivity of 0.001MPa have been developed.
High-speed 4.
In order to improve productivity, the rhythm of automation is accelerating, and high speed is an inevitable trend.
At present, the piston speed range of the cylinder is 50-750 mm/s. The piston speed of the cylinder is required to be increased to 5 m/s, up to 10 m/s. According to the survey, five years later, the speed of 2-5 m/s, the cylinder demand will increase by 2.5 times, 5 m/s above the cylinder demand will increase by 3 times. Accordingly, the response speed of the valve will be accelerated, and the requirement will be increased from the current 1/100 second level to 1/1000 second level.
5. oil-free, tasteless, sterile
Humans are increasingly demanding the environment, so oil-free pneumatic components will be popularized. There are also some special industries, such as food, beverages, pharmaceuticals, electronics, etc., which have stricter requirements for air. In addition to no oil, they also require odorless and sterile. Filters with such special requirements will be continuously developed.
6. high life, high reliability and self-diagnostic function
50 million times the life of the valve and 3000km of the cylinder has been commercialized, but in the textile machinery has a high frequency valve life requirements of more than 0.1 billion times, the best up to 0.2 billion times. This requirement, the existing elastic sealing valve is difficult to achieve, which makes the gap sealing element to regain attention. Numatics (Numatics) company in the United States has a kind of air valve, which adopts gap sealing. After ventilation, the valve core is suspended in the valve body to form frictionless movement and self-dustproof function. The service life of the valve can exceed 0.2 billion times. Although it is an old product, it is still worth learning from. Pneumatic components are mostly used in automatic production lines, the failure of components often affects the operation of the whole line, the sudden stop of the production line, resulting in serious losses, for this reason, the reliability of pneumatic components put forward high requirements. A chemical fiber company in Jiangsu requires the supply of pneumatic components to be absolutely reliable within the set life, and to be replaced regardless of whether they can continue to be used or not. Here, the balance of the life of various components is put forward, that is, the so-called equal life design. Sometimes in order to ensure reliable work, have to sacrifice life indicators, therefore, the self-diagnostic function of pneumatic systems mentioned on the agenda, additional predictive life and other self-diagnostic functions of components and systems are being developed. With the multi-function of mechanical devices, the number of wiring is increasing, which not only increases the workload of installation and maintenance, but also easily fails and affects the reliability of work. Therefore, the improvement of wiring system is also paid attention to by pneumatic components and system designers.
7. energy saving, low power consumption
Energy conservation is a permanent issue for enterprises and will be stipulated in the establishment of ISO14000 environmental protection system standards.
The low power consumption of pneumatic components is not only for energy saving, but also can be combined with microelectronics technology. The solenoid valve with power consumption of 0.5W has long been commercialized, and the air valve of 0.4W and 0.3W has also been developed and can be directly controlled by PC.
8. mechatronics
In order to accurately achieve preset control objectives (such as switching, speed, output force, position, etc.), closed-circuit feedback control should be used. The conversion between the gas-electrical signal has become the key to achieve closed-circuit control, and the proportional control valve can become the interface for this conversion. In the future for a long period of time to develop various forms of proportional control valve and electric-gas ratio/servo system, and make its performance is good, reliable, cheap is a major issue in the development of pneumatic technology.
At present, there are many application examples of proportional/servo systems, such as precise positioning of cylinders; suspension systems for vehicles to achieve good vibration reduction performance; automatic tilting devices for cable cars when turning; robots for serving patients, etc. How to make the above examples more practical and economical remains to be further improved.
9. meet the special requirements of certain industries
In the fierce market competition, the development of special pneumatic components for the specific requirements of certain industries is an important aspect of market development, and all factories are very concerned. Domestic pneumatic industry recently developed such as aluminum special cylinder (high temperature, self-locking), railway special cylinder (seismic, high reliability), rail lubrication special valve (anti-low temperature, self-filtering capacity), environmentally friendly automotive gas system (multi-media, excellent performance) and so on.
10. application of new technologies, new processes and new materials
Profile extrusion, casting infiltration and module assembly technologies have been widely used in China more than 10 years ago. New die casting technologies (hydraulic core pulling, vacuum die casting, etc.) and new deburring processes (explosion, electrolysis, etc.) have been gradually popularized in China. Piezoelectric technology, bus technology, new soft magnetic materials, dialysis filtration membranes, etc. are being applied. Superfinishing and nanotechnology will also be transplanted.
The scientific and technical personnel in the pneumatic industry pay special attention to the new trend of the development of seals. Once the seals of new structures and new materials appear, they will be adopted.
XI. Standardization
Implementing standards, especially ISO international standards, is a principle that companies must abide. It has two aspects to do: first, pneumatic products should implement the current standards related to pneumatic, such as terminology, technical parameters, test methods, installation dimensions and safety indicators. The second is that enterprises should establish the guarantee system stipulated in the standards. There are three existing systems: quality (ISO9000), environmental protection (ISO14000) and safety (ISO18000). Standards are constantly added and revised, and enterprises and their products will continue to develop and update. Only in this way can we promote the steady development of pneumatic technology.
XII Security
From the recent promulgation of the pneumatic ISO international standards, it can be seen that the safety requirements of pneumatic components and systems are very strict. ISO4414 pneumatic general rules will be divided into 14 categories of dangerous elements, mainly mechanical strength, electrical appliances, noise, control failure and so on. ISO international organization has issued a ISO18000 of standards, requiring enterprises to establish a security assurance system, the security issues on the agenda of particular importance. To this end, product development and system design to effectively consider the safety indicators is also the general trend of the development of pneumatic technology. For domestic enterprises, because the past industry standards ignored safety issues, it is necessary to re-evaluate and correct the products that have been put into the market.


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