ABSTRACT

With the development of China's highway transportation industry and the popularization of vehicles, we can now travel quickly and effectively, but the attendant problem is: traffic accidents have increased accordingly, and the size of faulty models vary, in view of this situation, wrecker came into being. Wrecker means a special car with road rescue operation equipment,it is necessary for a wrecker to be able to timely transport the breakdown car to ensure smooth traffic. However, there are many problems in China, such as large space occupied, slow cleaning speed, inability to move quickly, weak mobility and easy to cause secondary damage to cars. Therefore,the demand for wrecker is also growing, the function of the wrecker is also increasing. The new type of wrecker will replace the old-fashioned wrecker, safe operation, fast is two important indicators of the vehicle, now the wrecker is personalized, humanized, high efficiency of the form of development. The lifting wrecker can solve the problem. CATIA software is used to model and modify the actual size to ensure no interference between parts.Besides ,it is used to check and modify the size of the parts again, so that each part can achieve lightweight loading system under the premise of ensuring normal operation.

Key words wrecker; top system; CATIA;finite element analysis

Content

Chapter 1 Foreword 5

1.1 Research purpose and significance 5

1.2 Present situation of technical research 7

1.3 Main research content 10

Chapter 2 Overview of wrecker 12

2.1 Structure form and application of wrecker 12

Chapter 3 Determination of the overall scheme wrecker 14

3.1 Selection of the chassis 15

3.2 Design for layout 17

Chapter 4 Structure design and verification of upper system 19

4.1 Design and check of insert board 19

4.2 Design and check of wire rope 22

4.3 Design and check of hydraulic system 23

Chapter 5 Establish the model 27

5.1 Brief introduction of finite element method 27

5.2 Introduction of CATIA 27

5.3 Modeling process 28

Chapter 6 Finite element analysis 31

6.1 Brief introduction of finite element method 31

6.2 The way of applying load 31

6.3 Results of finite element analysis 33

Chapter 7 Conclusion 35

reference documentation 36

Thanks 38

Chapter 1 Foreword

1.1 Research purpose and significance

In the 1950 s, the world's first wrecker was born in the United States. With the improvement of form and function, wrecker has evolved from a single structure and function to multi-function and multi-purpose. In the near future, wrecker will have greater working ability, more advanced operating methods and more comfortable working environment.

The development of wrecker is divided into the following stages: the first stage, in the 1950s, the wreckers have a single function and simple structure. At this stage, wreckers often use homemade chassis to install pulleys, wire ropes and winches on trucks. The crane is driven by mechanical transmission and supported by pull rod to pull one end of the faulty vehicle out of the field. The second stage was from 1950s to 1970s, represented by CHALLENGER,JERR-DAN and WRECKER in the United States, and many wrecker companies have advanced technology emerged in the world. At this stage, the technology of clearing the barrier car Great development has been made. First of all, hydraulic transmission and control technology are introduced. Secondly, this series of barrier removal vehicles in the variety and scale have increased. In addition, the structure and chassis are also diversified. The third stage, from the 1980 s to the present, is a period of rapid development of wrecker. The main characteristics of this stage are a variety of structures and functions, such as hoisting, towing, traction, maintenance and so on.

Since the 1980 s, China has begun to import and produce wreckers. However, by this time, foreign barrier removal vehicles have developed to the third stage. Therefore, China started late, the starting point is low. So far, the domestic road barrier removal vehicle has developed four series of hundreds of varieties, including clamp type, hanger type, flat type and ordinary type. Tonnage ranges from hundreds of kilograms to 60 tons, which can basically meet the needs of various vehicle rescue. However, in terms of technology and production capacity, it can only meet the needs of the domestic market, and there is still a big gap with the advanced level of the world. These aspects are mainly manifested in:（1）At present, the second kind of chassis used in domestic freight cars has replaced the barrier removal vehicle, therefore, the matching between the top loading system and the chassis is unreasonable, and the running capacity of the chassis has not yet been fully played.（2）Product development is still in the imitation stage, independent development types are not many. Only a few enterprises with large production use plasma or laser technology to ensure the accurate size of the billet and the deformation of the billet due to heat.（3）Intelligent monitoring. At present, the technology of domestic distress personnel can only meet the basic rescue and remedial measures, and the application of intelligent monitoring instruments is less.

With the development of China's highway transportation industry and the popularization of vehicles, we can now travel quickly and effectively, but the attendant problem is: traffic accidents have increased accordingly, and the size of faulty models vary, in view of this situation, road scavengers came into being. Road Scavenger means a special car with road rescue operation Equipment, referred to as a scavenger, also known as a road rescue vehicle, trailer, towing car. The scavenger is mainly composed of chassis, lifting device, lift traction device, hydraulic system, electronic control system, vehicle body and toolbox, etc. It has many functions, such as lifting, pulling and lifting traction. It is used for the clearance of highways and urban roads. As the car on the road when the fault and accident is inevitable, the main task of the clearance vehicle amount is to drag the faulty car or accident car away from the scene in time to ensure that the road is unobstructed.

China's scavenger car started in the 80 's, is gradually in line with the world. With the development speed of urbanization in the new century, road traffic conditions have been continuously improved, the situation of vehicle accidents on the road is also changing, the demand for scavenger vehicles is also growing, the function of the scavenger is also increasing. The new type of scavenger will replace the old-fashioned scavenger, safe operation, fast is two important indicators of the vehicle, now the scavenger is personalized, humanized, high efficiency of the form of development. The design of this scavenger to improve the intelligence of the scavenger, in the road clearance process, to ensure that the vehicle in the working state of safe, convenient and fast. As a result, road scavengers are known as "messengers that make the Earth's veins more open."

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