System introduction of pneumatic stop valve
The pneumatic actuator XM-AT190.jpg takes the application of series pneumatic actuators in SR spring return as an example to illustrate the selection of single action pneumatic actuators. The output torque is obtained in two different operations. Each operation produces two different torque values depending on the stroke position. The output torque of the spring return actuator is obtained by multiplying the force (air pressure or spring force) by the force arm: the output torque is obtained by compressing the spring into the middle chamber, which is called "pneumatic stroke output torque". In this case, the air pressure forces the piston to move from 0 ° to 90 °, and the spring compression produces a reaction force. The torque gradually decreases from the large value of the starting point to the second case: the output torque is the result of the spring restoring force, when the air is discharged from the middle chamber. In this case, due to the elongation of the spring, the output torque is reduced from 90 degrees to 0 degrees. The design of the single acting actuator is based on the balancing torque generated in both cases. In each case, by changing the relationship between the number of each spring and the supply pressure (for example, two and five. 5 bar supplies per spring, and vice versa), two conditions can be obtained in spring return applications: loss of air open or loss of air close. As a physical means of multi frequency ultrasonic extraction synthesis reaction device, it is recommended that the safety factor of spring return actuator be 25-50%. The compound comparative experiment of molecular cleaning and pyrolysis is mainly used to explore different frequencies and different powers of ultrasound, and obtain new reactions and substances through specific means.
In fact, the pneumatic system and the electrical system of the single acting pneumatic actuator are not mutually exclusive. The utility model has the advantages of simple structure, convenient maintenance and fast linear circular movement. It can also be used in various harsh working environments, such as explosion-proof requirements, dusty or humid working environments. However, in the case of rapid increase in force and need for accurate positioning, the electric driver driven by servo motor has advantages. The electric driver is a good choice for precision, synchronous operation and adjustable positioning programming. The shortage of pneumatic system can be remedied by using the servo system of closed loop position controller or the electrical system composed of stepping motor.
In modern control, various systems become more and more complex and sophisticated. Drive control technology that can not meet various control functions of the system. Single acting pneumatic actuator is mainly used in the occasion where precise control is required. Continuously improve the flexibility requirements of automation equipment. The same equipment usually needs to meet the processing needs of workpieces with different sizes. The actuator needs multi-point positioning control. The traditional pneumatic control cannot achieve the operating speed and torque of the actuator. The electric actuator can easily achieve this control. It can be seen that pneumatic actuators are more suitable for simple motion control, while electric actuators are mainly used for precise motion control.
