Because the control is simple, the line is simpler. Pneumatic, the simplest even only need a gas storage equipment, such as cylinders, you can even do not need an air pump. Of course, we usually do. The power output components can be cylinders or air motors. The control part is generally a solenoid valve. So what are the advantages over electric? 1: Solenoid valve is generally low-voltage/weak electric drive (relative to the motor), the required line is very thin, almost no safety hazards.2: power supply: only need to connect a gas pipe from the gas storage equipment to the solenoid valve, and then connected to the output part can be, there is almost no safety hazards 3: The output power is stable and fast, and it does not need to consider starting current and stopping voltage as well as variable speed as the motor.
Disadvantages :1: accuracy is not enough. Simple stepper motor open loop control can achieve high precision. So the pneumatic is more suitable for the occasion of fixed stroke.2: some occasions lack of power. Although it can meet most scenarios, but special cases need to use hydraulic pressure. 3: too noisy If you have multiple valves working on the side.
The reasons why electric dry but pneumatic, or the comparative advantages of pneumatic, I understand the following:
1, high power density, lightweight and compact pneumatic and hydraulic systems in the same system weight size, the power can be transmitted is generally greater than the electric. This is mainly because the cylinder hydraulic cylinder and other fluid actuator structure is simple and mostly direct drive load, and the same power of the motor a large piece of magnetic steel, copper wire, but also consider the heat dissipation, the motor and the load generally have to add a reducer, volume weight is generally greater than the same power gas-liquid actuator.
2, simple and reliable, durable
The main reason is as described in 1, the transmission mechanism of the general pneumatic system is simpler than the electric system, in addition to the compact and lightweight described in 1, bringing another benefit of fewer potential points of failure and higher system reliability.
3. Hygiene
Have you ever smelled a burning motor? It’s in your DNA to tell you it’s poisonous. Do not believe that you look for the list of materials for the manufacture of motors, and see how many can meet the health and safety requirements of food and medicine: various insulating paints, adhesives, and rare earth alloys.
4. Explosion-proof
Many electrical equipment in the use of the theory there is the possibility of sparks, such as plug-in plug and loose, such as a variety of coils will produce counteremf, such as the capacitor on the circuit board may suddenly explode.
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