Chapter 1 Introduction to Pneumatics

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Pneumatics , is the use of compressed air has pressure energy, as the various types of mechanical control purposes, in order to save manpower and improve productivity, one of the main sources of power automation.

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 1-1.  Signal flow of Pneumatic control system   P3   TOP

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1-2.  Characteristics of Pneumatic System       P5       

( 1 ) Advantages

1. Easy to get

2.Good explosion resistance

3. Easy transmission

4. Easy storage

5. Fast speed

6. Overload safety

7. Clean

8. Easy to adjust

9. Simple structure

10. Adjustable stroke

11. Can produce linear motion directly

12. Wide operating temperature

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( 2 ) missing points

1. Higher cost

2. Easy to leak

3. Compressible

4. Lack of lubricity

5. Limited output

6. Large Exhaust noise

1-3.  Economic benefits of pneumatic system      P6     

 Pneumatic systems are a relatively expensive source of power. However, from the perspective of long-term investment, the use of Pneumatic instead of labor can improve the efficiency of production and make it easier to master schedules. Long-term costs are more cost-effective.

1-4.  Impact of air leakage on air pressure system     P7        

1-5.  Basic physical principles applied to Pneumatic control    P9         

1-5.1 Composition of air

Standard state (ANR) : temperature 20 ^¢J 

                                : absolute pressure 760 mmHg

                                : relative humidity 65%

                                : specific gravity of air 1.293Kg / m ³
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Reference state: temperature 0 ^¢J

                    : absolute pressure 760 mmHg

                    : dry state ( relative humidity 0%)

1-5.2 Definition and Unit of Pressure P

1-6.  Pressure range used by the pneumatic system   P12      

1. Low pressure system: 0.5 ~ 500 mbar   

2. Medium pressure system: 1 ~ 4 bar   

3. Normal pressure system: 3 ~ 8 bar   

4. High pressure system: above 10 bar   

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1-7.  Important Laws Related to Pneumatic  P13      

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1-8.  Air humidity and dew point      P16      

1-9.  Air flow       P18     

       Flow formula: Q = A ¡P V

Where Q : flow rate; 

          A : cross-sectional area of ​​the pipeline; 

          V : flow speed.

¡@    Such a relationship are called the law of continuity.

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1-10. Sequence Control       P20      

GOTO Chapter 2 Introduction to Components of  Pneumatic System     

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