Table
of Contents Abstract I
Abstract I
Table of Contents 1
Chapter 1 Introduction 1
1.1 Overview of Lifting and Transporting Machinery 1
1.1.1 Functions of Lifting and Transporting Machinery 1
1.1.2 Working Characteristics of Lifting and Transporting Machinery 2
1.2 Development Trend of Lifting and Transporting Machinery 3
1.2.1 Development direction of domestic cranes 5
1.2.2 Development direction of foreign cranes 6
1.2.3 Comparison of the status quo
of domestic and foreign cranes 7 1.3 Research significance of the subject 7
1.4 Main content of this subject research 8
Chapter 2 Gantry crane structure classification and Working Principle 9
2.1 Classification of Gantry Cranes 9
2.2 Structure of Gantry Cranes 9
2.3 Main Forms of Gantry Cranes 10
2.4 Selection of Gantry Cranes 11
2.5 Basic Parameters of Gantry Cranes 12
2.6 Working Types of Gantry Cranes 13
2.7 Materials Used in Gantry Cranes 14
2.7.1 Types of materials used 14
2.7.2 Requirements for materials used 15
2.8 Summary of this chapter 15
Chapter 3 Overall design of gantry cranes 16
3.1 Overall design parameters 16
3.2 Metal structure design calculation 17
3.2.1 Basic design parameters 17
3.2.2 Load 17
3.2.3 Stability against overturning 18
3.3 Section geometrical properties of metal structures 19
3.4 Calculation of main beam strength 20
3.4 Calculation of outrigger strength 21
3.5 Summary of this chapter 24
Chapter 4 Design and calculation of hoisting mechanism and running mechanism
of trolley 25 4.1 Design and calculation of hoisting mechanism of trolley 25
4.1 .1 Selection of wire rope 25
4.1.2 Drum 26
4.1.3 Selection of motor 26
4.1.4 Selection of reducer 27
4.1.5 Selection of brake 28
4.1.6 Calculation of starting time of mechanism 28
4.2 Design and calculation of traveling mechanism of trolley 29
4.2.1 Basic parameters of trolley running mechanism 29
4.2.2 Running static resistance 29
4.2.3 Selection and calculation of electric motor 30
4.2.4 Selection and calculation of reducer 30
4.2.5 Selection of coupling 31
4.2.6 Selection of brake Selection 32
4.2.7 Calculation of the strength of trolley wheels 32
4.3 Summary of this chapter 33
Chapter 5 Design and calculation of the traveling mechanism of the cart 34
5.1 Basic parameters of the traveling mechanism of the cart 34
5.2 Running static resistance 34
5.3 Selection and calculation of the electric motor 35
5.4 Reducer Selection 35
5.5 Selection of buffers 35
5.6 Wheels and tracks 36
5.7 Summary of this chapter 36
Conclusion 37
Reference 38
Acknowledgments 40
Chapter 3 Overall Design
of Gantry Crane The 450-ton crane designed in this paper is used in the high-speed railway engineering-style concrete girder manufacturing field, as shown in Figure 3.1, the concrete box girder made by the beam field has a mass of 900 Tons are usually hoisted by two 450-ton gantry cranes across the railway line. This crane can be used to assemble bridge cranes.
Figure 3.1 Gantry crane assembly diagram
The layout of the beam field is different from that of the main type of operation, and the span and lifting height of the crane are also different. In order to meet different requirements, the structural form is also different. Beams and outriggers adopt an A-shaped structure and are rigidly connected to the main beam. In order to improve the force distribution of the outriggers, the joints of the outriggers and the main beam also adopt a rigid structure on one side and a flexible structure on the other [21-22].
3.1 Overall Design Parameters
According to the design requirements, the design parameters of the crane are as follows:
1. Working level of the whole machine: A3 (U1, Q4)
2. Lifting capacity:
3. Span:
4. Maximum lifting height:
5. Lifting speed:
6. Cart running speed:
7. Cart running speed:
8. Cart working level: M3
9. Cart working level: M3
10. Lifting working level: M4
11. Metal structure working level E3 (B2, S4)
5th Chapter Design and Calculation of the Traveling Mechanism of the
Cart When the traveling mechanism of the cart is working, it is mainly used for the convenience of loading goods. As shown in Figure 5.1, this group of traveling mechanism diagrams of the cart.
Figure 5.1 The traveling mechanism of the cart
5.1 Basic parameters of the traveling mechanism of the cart
According to the design requirements, the design parameters of the traveling mechanism of the cart are as follows:
1. Lifting weight:
2. Self-weight of the whole machine:
3. Span:
4. Running speed of the cart:
5. The working level of the whole machine: A3
6. The working level of the mechanism: M3
