Electrical Engineering and Automation Electric Locomotive Graduation Project Topic

Based on PLC five-layer elevator control system.

Directory. Preface 3

1. Choice of programmable controller (PLC) 4

Design Principles for PLC Control Systems 4

FX2N Series 4

The number of input and output points is 4

Pacing and capacity calculations 4

The input characteristics of the FX series PLC are as follows: (5).

Output Form 6

2. PLC and its application in elevator control 6

System Block Diagram 7

Advantages of Elevator Relay Control System 7

Problems with the elevator relay control system 8

Features of PLC 8

3. Elevator development dynamics 9

Classification of elevators 9

The main components of the elevator 10

Safety protection device for elevator 10

Elevator development dynamics 11

Overview of the development of elevator technology 11

IV. System Hardware Design 12

Functions implemented by the elevator control system 12

Elevator operation mode 13

Input and output wiring list 13

External Wiring Diagram 14

Control Flow Chart 15

Elevator Control System Simulation 16

Ladder Diagram Program 17

Working process 22

Summary 28

Acknowledgments 28 Ref. 29

Abstract]:In view of the needs of PLC and elevator teaching, this paper introduces the composition, design requirements, programming methods and procedures of the self-designed 16-storey elevator model controlled by PLC. The design of the elevator model using PLC control system is described, and through the application of practical teaching, valuable experience has been accumulated, which has good practical value in teaching.

Fault analysis and treatment of traction buffer device of urban rail vehicles.

1. Introduction to the longitudinal impulse mechanism of trains and the development of buffers. 1

1) The longitudinal impulse mechanism of the train. 1

2) The principle and type of buffer. 2

1. The principle and main performance of the truck buffer. 2

2. The type of buffer. 4

Second, the current situation of truck buffers in China. 4

3. Troubleshooting - take the 17 type coupler buffer device as an example. 4

1) Analysis of the cause of the failure. 4

1. Analysis of the causes of cracks in hook tail pins. 4

2. Analysis of the causes of cracks caused by impact of the lower lock pin hole. 5

3. Analysis of the causes of cracks in the hook cavity traction table. 5

4. Analysis of the causes of hook tongue cracks. 6

5. Analysis of the reasons for the lack of free height of the buffer and the loosening of the center wedge. 6

6. Analysis of the causes of cracks in hook tail frames. 6

7. Analysis of the reasons for the unclear manufacturing mark of the hook tail frame. 6

2) Suggestions for the manufacture of 17-type coupler buffer device and vehicle maintenance operations.........6

Acknowledgments .........8

References. 9