What If the Pneumatic Equipment Fails

Pneumatic technology, like electronic technology and hydraulic technology, has become one of the effective technologies in the automatic production process. Pneumatic technology has developed rapidly. It is mainly used in the field of mechanization and automation. At the same time, its application field is also expanding rapidly and plays a more and more important role in the national economic construction. In many industrial sectors, the comprehensive application level of microelectronics and pneumatic technology has been regarded as an important index to evaluate the degree of automation and modernization of the industry. The application of pneumatic technology in electronics, food, medical and other industries is expanding day by day. In recent years, with the large-scale development of robots and the development of factory automation, pneumatic technology has played an important role.

There will always be various faults in the use of pneumatic equipment. What if there is a fault? Therefore, the author compiled this book according to his own work practice. This book lists the working principles and structures of various typical pneumatic components. Understanding the working principles and structures of pneumatic components is the basis for dealing with various faults. This book gives the main faults and troubleshooting methods of various components, so that readers can accurately implement the fault analysis and troubleshooting and grasp the main contradictions.

Pneumatic fault diagnosis and maintenance manual is compiled by best-selling author Lu Wanglong in combination with his decades of work experience and case summary accumulated in the process of enterprise training. It is a rare reference book for technicians engaged in pneumatic maintenance.

Pneumatic fault diagnosis and maintenance manual mainly introduces the working principle and structural characteristics of various pneumatic components and systems, as well as the fault diagnosis and maintenance methods and operation skills of relevant pneumatic equipment during use. The content covers the basic knowledge of pneumatic technology, various pneumatic components, such as air compressor (air source device), compressed air treatment and purification device, pneumatic actuator (cylinder, air motor, etc.), pneumatic control component (pneumatic control valve), vacuum component (vacuum pump, vacuum suction cup, etc.), and pneumatic basic circuit (pressure circuit, reversing circuit, speed circuit, etc.) The working principle, structural characteristics, functions, fault analysis and troubleshooting methods, as well as the maintenance points and fault analysis examples of typical pneumatic system.

The pneumatic fault diagnosis and maintenance manual is systematic, concise, practical and easy to check. It is suitable for engineering technicians and skilled workers engaged in pneumatic maintenance. It can also be used as a reference for teachers and students majoring in machinery and automation in pneumatic technical maintenance training institutions and various vocational and technical colleges.

The pneumatic fault diagnosis and maintenance manual is divided into 8 chapters:

Chapter 1 is an overview, which introduces the basic knowledge of pneumatic technology. Mastering the basic knowledge of pneumatic technology is the basis of doing a good job of maintenance;

Chapter 2 introduces the fault diagnosis and maintenance of air compressor. Air compressor is the heart of pneumatic equipment and the power source of pneumatic equipment;

Chapter 3 introduces the fault diagnosis and maintenance of compressed air treatment and purification device. Clean compressed air is the basis of no fault and less fault of pneumatic equipment;

Chapter 4 introduces the fault diagnosis and maintenance of pneumatic actuator, including cylinder and pneumatic motor. Pneumatic actuator is an element that outputs movement and work to the outside;

Chapter 5 introduces the fault diagnosis and maintenance of pneumatic control elements, which control the moving direction, speed, output force and output torque of actuator;

Chapter 6 introduces the fault diagnosis and maintenance of vacuum components;

Chapter 7 introduces the fault diagnosis and maintenance of pneumatic basic circuit, and analyzes the working principle and possible faults of the three basic circuits;

Chapter 8 introduces the fault diagnosis and maintenance of pneumatic system, including the maintenance, spot inspection and fault analysis and treatment of pneumatic system.

Introduction to the author

Inner page display

catalogue

Chapter 1 Overview

1.1 introduction to pneumatic transmission and pneumatic technology 1

1.2 composition of pneumatic system and functions of main components 3

1.3 comparison of various transmission modes and advantages and disadvantages of pneumatic system 6

1.4 graphical symbols of pneumatic components 7

1.5 basic knowledge of pneumatic transmission 9

1.5.1 physical properties of air (atmosphere) 10

1.5.2 compressed air 12

Chapter 2 fault diagnosis and maintenance of air compressor (air source device)

2.1 introduction to air compressor 19

2.2 piston air compressor 20

2.2.1 classification of piston air compressor 20

2.2.2 working principle of piston air compressor 20

2.2.3 structure of piston air compressor 22

2.2.4 fault analysis and troubleshooting of piston air compressor 24

2.3 screw air compressor 28

2.3.1 classification and application of screw air compressor 28

2.3.2 working principle and structure of screw air compressor 29

2.3.3 regulating system of screw air compressor 30

2.3.4 fault analysis and troubleshooting of screw air compressor 34

2.4 centrifugal air compressor 38

2.4.1 working principle and structure of centrifugal air compressor 38

2.4.2 fault analysis and troubleshooting of centrifugal air compressor 40

2.5 other air compressors 42

2.5.1 roots air compressor 42

2.5.2 vane (sliding vane) air compressor 43

2.5.3 axial flow air compressor 44

2.5.4 diaphragm air compressor 45

Chapter 3 fault diagnosis and maintenance of compressed air treatment and purification device

3.1 introduction to compressed air treatment and purification device 46

3.2 gas tank 49

3.3 dryer 50

3.3.1 structural principle of Absorption Dryer 50

3.3.2 structural principle of adsorption dryer 51

3.3.3 structural principle of freezing dryer 51

3.3.4 structural principle of hollow membrane dryer 52

3.3.5 troubleshooting of refrigerated air dryer 54

3.4 aftercooler 55

3.4.1 structural principle of air-cooled aftercooler 55

3.4.2 structural principle of water-cooled aftercooler 56

3.4.3 fault analysis and troubleshooting of cooler 58

3.5 filter 59

3.5.1 filter element 59

3.5.2 function type of filter and cylinder protection 61

3.5.3 arrangement of filter layers 61

3.5.4 structural principle of air filter 62

3.5.5 characteristics of various filters 67

3.5.6 fault analysis and troubleshooting of filter 68

3.5.7 disassembly and inspection of air filter 69

3.6 drainer 70

3.7 oil mist 73

3.7.1 function of oil mist 73

3.7.2 working principle of oil atomizer 74

3.7.3 structure of oil atomizer 75

3.7.4 fault analysis and troubleshooting of oil mist 80

3.8 pneumatic triplet 82

3.8.1 introduction to gas source purification treatment device 82

3.8.2 combination mode of modular FRL elements 83

3.8.3 structural principle of modular FRL assembly 86

3.9 other auxiliary elements 89

3.9.1 silencer 89

3.9.2 pipe fittings 91

3.9.3 sealing 95

Chapter 4 fault diagnosis and maintenance of pneumatic actuator

4.1 introduction to pneumatic actuator 105

4.2 cylinder 107

4.2.1 working principle and structure of cylinder 107

4.2.2 fault phenomenon and cause of cylinder 133

4.2.3 fault analysis and troubleshooting of cylinder 134

4.2.4 regular maintenance of cylinder 137

4.3 swing cylinder 137

4.3.1 working principle and structure of rack and pinion swing cylinder 137

4.3.2 working principle and structure of blade swing cylinder 142

4.3.3 fault analysis and troubleshooting of swing cylinder 145

4.4 air motor 145

4.4.1 classification and characteristics of air motor 145

4.4.2 working principle and structure of vane air motor 146

4.4.3 working principle and structure of gear air motor 147

4.4.4 working principle and structure of piston air motor 147

4.4.5 fault analysis and troubleshooting of air motor 150

Chapter 5 fault diagnosis and maintenance of pneumatic control elements

5.1 pneumatic directional control valve 152

5.1.1 one way directional control valve 152

5.1.2 directional control valve 158

5.1.3 several typical pneumatic directional control valves 176

5.2 pneumatic pressure control valves184

5.2.1 pressure reducing valves184

5.2.2 overflow valve 196

5.2.3 sequence valve 200

5.2.4 pressure relay 202

5.3 pneumatic flow control valve 206

5.4 electro pneumatic servo valve 210

5.4.1 introduction to electro pneumatic servo valve 210

5.4.2 electro mechanical conversion device 211

5.4.3 pre stage and power amplifier stage 218

5.4.4 structure principle and application of electro pneumatic servo valve 223

5.4.5 fault analysis and troubleshooting of electro pneumatic servo valve 232

5.5 electro pneumatic proportional valve 234

5.5.1 proportional electromagnet234

5.5.2 control type of electro pneumatic proportional valve 237

5.5.3 structural principle of proportional pressure valve 238

5.5.4 structural principle of proportional directional valve 246

5.5.5 structural principle of proportional flow valve 249

5.5.6 structural principle of proportional flow pressure valve 251

5.5.7 use of electro pneumatic proportional valve 253

5.6 pneumatic logic element 254

5.6.1 introduction to logic control 254

5.6.2 classification, advantages and disadvantages of logic elements 255

5.6.3 structure and performance of logic elements 256

5.6.4 basic logic circuit 259

Chapter 6 fault diagnosis and maintenance of vacuum components

6.1 vacuum pump263

6.1.1 rotary vane vacuum pump 263

6.1.2 roots vacuum pump267

6.1.3 reciprocating vacuum pump274

6.1.4 screw vacuum pump275

6.1.5 water ring vacuum pump277

6.2 vacuum generator and related elements 281

6.2.1 working principle of vacuum generator 281

6.2.2 structure and performance of vacuum generator 282

6.2.3 problems and unsuitable cases of vacuum suction system 284

6.2.4 circuit composed of relevant components for vacuum system and vacuum generator 287

6.3 vacuum sucker 293

Chapter 7 fault diagnosis and maintenance of pneumatic basic circuit

7.1 pressure control circuit 298

7.2 commutation circuit and intermediate stop circuit 304

7.3 speed control circuit 313

7.4 introduction to other circuits 320

Chapter 8 fault diagnosis and maintenance of pneumatic system

8.1 maintenance of pneumatic system323

8.1.1 key points of pneumatic system maintenance 323

8.1.2 implementation of regular maintenance of pneumatic system 324

8.2 point inspection of pneumatic system326

8.2.1 "point" in point inspection of pneumatic system 326

8.2.2 "check" in point check of pneumatic system 327

8.2.3 repair work for point inspection of pneumatic system 329

8.3 fault analysis and troubleshooting of pneumatic system 331

8.3.1 fault diagnosis methods 331

8.3.2 faults caused by three categories of impurities in the air of pneumatic system and troubleshooting 332

8.3.3 faults and troubleshooting of air supply device 334

8.3.4 faults and troubleshooting of pneumatic actuator (cylinder) 335

8.3.5 faults and troubleshooting of pneumatic reversing valve 335

8.3.6 faults and troubleshooting of pneumatic auxiliary components 336

8.4 failure analysis and troubleshooting examples of pneumatic system 336

8.4.1 working principle of pneumatic system of automatic tool changer 337

8.4.2 fault analysis and troubleshooting of pneumatic system of automatic tool changer 338

Original title: Maintenance Manual for real, reliable, practical and easy to check and quickly solve pneumatic system faults

The source of the article: WeChat official account: industrial robot] welcome to add attention! Please indicate the source of the article.

What If the Pneumatic Equipment Fails 1

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