The positioning accuracy of the SMC actuator is improved, the stiffness is increased, the piston rod does not rotate, and the use is more convenient. In order to improve the positioning accuracy of the pneumatic pneumatic cylinder, the application of pneumatic pneumatic cylinders with braking mechanisms and servo systems is becoming more and more common. For the pneumatic pneumatic cylinder with servo system, even if the air supply pressure and the negative load change, the positioning accuracy of ±0.1mm can still be obtained.
At international exhibitions, there are many pneumatic cylinders with pneumatic cylinders and piston rods of various special-shaped sections. Since the piston rods of these types of pneumatic cylinders do not rotate, they can maintain a certain precision when applied to the main engine without additional guiding devices. In addition, many pneumatic cylinders and pneumatic cylinder sliding assemblies with various guide mechanisms have been developed, such as pneumatic cylinders with two guide rods, double-piston-rod double-pneumatic cylinder pneumatic cylinders, etc.
The shape of the pneumatic cylinder barrel is no longer limited to a circle, but a square, a rice-shaped or other shapes. The profiles are provided with guide grooves, installation grooves for sensors and switches, etc., making it more convenient for users to install and use.
Multifunctional and compound. In order to facilitate users and meet the needs of the market, various small pneumatic systems are developed that are combined with multiple pneumatic components and equipped with control devices. For example, the components used to move small items are composed of two pneumatic cylinders with guides according to the X axis and the Z axis respectively. The component can move 3kg heavy objects, is equipped with solenoid valve, program controller, compact structure, small footprint, and adjustable stroke. Another example is a loading and unloading module, which has seven module forms with different functions, which can complete the loading and unloading operations on the precision assembly line, and can combine different modules arbitrarily according to the content of the operation. There is also a manipulator which is a combination of a swing pneumatic cylinder and a collet with a small shape and can change the swing angle. There are several kinds of collets for the collet part to choose from.
Combined with electronic technology, a large number of sensors are used, and the pneumatic components are intelligent. Pneumatic cylinders with switches have been widely used in China, and the switches will be smaller in size and higher in performance. , making the system more reliable. Using sensors to replace flow meters and pressure gauges can automatically control the flow and pressure of compressed air, which can save energy and ensure the normal operation of the equipment. Pneumatic servo positioning systems have already entered the market. The system uses a three-position five-way pneumatic servo valve, compares the predetermined positioning target with the detection data of the position sensor, and implements negative feedback control. When the maximum speed of the pneumatic cylinder reaches 2m/s and the stroke is 300mm, the positioning accuracy of the system is ±0.1mm. A new type of intelligent solenoid valve has been successfully trial-produced in Japan. This valve is equipped with a logic circuit with sensors and is the product of the combination of pneumatic components and optoelectronic technology. It can directly accept the signal of the sensor, when the signal meets the specified conditions, it can complete the action by itself without going through the external controller to achieve the control purpose. It has been applied to the conveyor belt of objects, which can identify the size of the objects to be carried, so that large pieces can be sent directly, and small pieces can be diverted.
Higher safety and reliability. From the international standards of pneumatic technology in recent years, the standards not only propose interchangeability requirements, but also emphasize safety. The pressure of the pressure test of pipe joints, air source treatment shells, etc. is increased to 4~5 times of the working pressure, and the pressure resistance time is increased to 5~15min, and the test should be carried out at high and low temperatures. If these international standards are implemented, it is difficult for domestic pneumatic cylinders, end caps, air source treatment castings and pipe joints to meet the standard requirements. In addition to the pressure test place, certain regulations are also made on the structure. For example, the outside of the transparent shell treated by the gas source is required to be equipped with a metal protective cover.
Many applications of pneumatic components, such as rolling mills, textile lines, etc., cannot be interrupted due to the quality of pneumatic components during working hours, otherwise it will cause huge losses, so the working reliability of pneumatic components is very important. There are many pneumatic components used on sailing ships, but there are not many pneumatic component factories that can enter this field. The reason is that they have particularly high requirements on the reliability of pneumatic components and must pass relevant international machinery certification.
To develop in the direction of high speed, high frequency, high response and long life. In order to improve the production efficiency of production equipment, it is imperative to improve the working speed of the actuator. At present, the working speed of the pneumatic cylinder in my country is generally below 0.5m/s. According to the prediction of the Japanese zhuang family, the working speed of most of the pneumatic cylinders will be increased to 1~2m/s after five years, and some require up to 5m/s. The improvement of the working speed of the pneumatic cylinder requires not only the improvement of the quality of the pneumatic cylinder, but also the corresponding improvement in the structure, such as the configuration of the hydraulic shock absorber to increase the buffer effect. The response time of the solenoid valve will be less than 10ms, and the service life will be increased to more than 50 million times. There is a gap-sealed valve in the United States. Because the valve core is suspended in the valve body and does not contact each other, the service life is as high as 200 million times without lubrication.
Oil-free lubrication technology is widely used to meet some special requirements. Due to environmental pollution and the requirements of electronics, medical, food and other industries, oil is not allowed in the environment, so oil-free lubrication is the development trend of pneumatic components, and oil-free lubrication can be Simplify the system. Lubricators in the European market are already outdated products, and oil-free lubrication is generally achieved. In addition, in order to meet certain
Special requirements, deodorization, sterilization and precision filters are being continuously developed, the filtration precision has reached 0.1~0.3μm, and the filtration efficiency has reached 99.9999%.
According to some special requirements, improving and developing pneumatic products can occupy a market and obtain a lot of economic benefits. This has been agreed by everyone. Jinan Huaneng Pneumatic Components Co., Ltd. has developed pneumatic cylinders and valves for the special requirements of railway marshalling and wheel-rail lubrication, which have attracted the attention of the railway department.
Using new materials and combining with new technologies. Membrane dryers have been developed abroad. The dryers use high-tech reverse dialysis membranes to filter moisture from compressed air. It has the advantages of energy saving, long life, high reliability, small size and weight. Light and other characteristics, suitable for occasions with small flow.
Pneumatic seals made of composite materials with polytetrafluoroethylene as the main body can be heat-resistant (260°C), cold-resistant (-55°C) and wear-resistant, and are used in more and more occasions.
In order to improve the quality, new technologies such as vacuum die casting and hydrogen-oxygen explosion deburring are gradually being promoted in the manufacture of pneumatic components.
It is easy to maintain, repair and use. Foreign countries are studying the use of sensors to realize the function of fault prediction and self-diagnosis of pneumatic components and systems
Post time: Jul-11-2022