Wuhan University of Technology Graduation Design (Thesis)

Overall layout and design of Road-rail dual-purpose high-altitude working vehicle

School: School of International Education

Specialty amp; Class: Automotive Engineering gj1501

Name: Fu Shucheng

Tutor：Qiao Weigao

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Abstract

With the development of urban rail transit in China, railway and urban rail transit have developed rapidly. More than 30 cities have opened urban rail transit. An increase in the number of infrastructures also means an increase in the frequency of equipment failures, which requires efficient maintenance of equipment. Equipment to ensure that the failure of equipment can be timely maintenance or replacement. The dual-use high-altitude work vehicle has the advantages of flexibility and adaptability, and can transfer personnel and equipment to specific locations for air operations by using rail transit and highway traffic, which is more advantageous than the traditional high-altitude work vehicle and high-altitude work vehicle. However, the domestic research on road-to-rail dual-use aerial work vehicle is not very mature, so we need to increase the research investment in this aspect. This design mainly provides an overall layout plan of a road-and-rail dual-purpose high-altitude work vehicle. The special work vehicle of this plan can not only complete the basic functions of ordinary cars, but also realize the functions of upper rail, lower rail, rail running and high-altitude work. This paper describes the selection and change of the chassis of this kind of vehicle, the layout of the force extractor, the overall structure design and hydraulic circuit design of the aerial work device, the overall structure design and hydraulic circuit design of the rail driving system (mainly bogie), and so on.

Keywords: roadway/rail dual-purpose aerial work vehicle; General layout; Articular-arm high-altitude working platform; Single-shaft power bogie.

Directory

Chapter 1 introduction 1

Chapter 2 chassis overall layout design 3

2.1 chassis selection 3

2.2 changes to the original chassis parts: 5

2.3 layout of force Power-Take-Off 6

2.4 sub-frame design 6

Chapter 3 design of aerial working equipment 8

3.1 review 8

3.2 design of lifting mechanism 8

3.2.1 material selection 8

3.2.2 analysis of working bucket force 9

3.2.3 determination of upper arm size 10

3.2.5 determination of lower arm size 12

3.2.6 lower arm strength check 13

3.3 rotary mechanism design 13

3.4 leg mechanism design 15

3.4.1 determination of leg transverse span 16

3.4.2 determination of leg longitudinal span 17

3.4.3 calculation of leg pressure 17

3.4.4 supporting foot design 19

Chapter 4 the design of Rail running system 20

4.1 determination of rail traction mode 20

4.2 overall design of bogie 21

4.2.1 wheel design 21

4.2.2 architecture design 22

4.2.3 design of drive device 22

4.3 calculation of rail running resistance 22

W is the load of rail wheel, take W=45000N; 23

Chapter 5 hydraulic system design 24

Chapter6 Conclusion 27

Acknowledgement 28

Reference 29

Chapter 1 Introduction

With the rapid development of China's railway and urban rail transit, the speed of all kinds of rail transit vehicles continues to improve, the construction and maintenance of railway and urban rail transit will face increasing pressure. The maintenance pressure of various in-line signals, lights, electrical equipment and other auxiliary equipment on the railway is increasing, which requires special operation equipment that can efficiently complete the maintenance and repair tasks.

With the rapid development of global economy and the influx of large population into major cities, the traffic pressure on the traditional surface roads is increasing and the traffic is becoming increasingly crowded. In addition, environmental pollution in cities is becoming more and more serious. The advantages of urban rail transit system, such as large volume, high speed, high reliability, energy conservation and environmental protection, make it recognized by people. It has become a global trend to develop urban rail transit system in big cities.

Road-rail dual-purpose high-altitude working vehicle is an amphibious high-altitude working vehicle with road-rail capability. Highway operation is the main operation mode of dual-use aerial vehicle, which is characterized by flexibility and wide range of work. When the vehicle is parked or driving on the highway, its rail bogie is lifted to the vicinity of the vehicle frame; When the vehicle is on the rail, the rail bogie is hydraulically driven. When some equipment in the rail transit network needs to be maintained, vehicles can use the highway network to drive to the nearest rail location, and then switch to the rail mode to go to the operation site. When the vehicle needs to give way to the rail vehicle on the rail, it can quickly drive to put the rail wheel top at the corresponding position of the rail and support the car body. By relying on the rail driving system, the motor can be switched to the highway driving mode for transfer, which saves the trouble of scheduling compared with the traditional rail operating vehicle. In addition, in such sites as railway stations, ports, small and medium-sized freight yards, industrial and mining enterprises, special warehouses and other sites, the operation area is very limited, the conventional traction vehicles occupy too much space, and the high-altitude vehicles do not need to park on the rail, the requirements for the parking place is low, the space is small.

Figure 1.2 ICON series road-rail dual-use aerial working vehicle

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