As a common means of transportation, the strength of the frame structure of the trolley case is crucial. From a mechanical point of view, this involves several key factors.
First, the choice of materials is the basis. The trolley case frame usually uses high-strength alloy materials or high-quality plastics. Alloy materials such as aluminum alloys have high strength and hardness and can withstand large external forces. This is because the arrangement of metal atoms inside the alloy and the characteristics of its chemical bonds enable it to effectively resist deformation and fracture when subjected to force. For example, the lattice structure formed by aluminum atoms and other alloying elements in aluminum alloys enhances the overall mechanical properties.
Secondly, the geometric shape design of the frame affects its mechanical properties. Common frame shapes include rectangles and circles. When a rectangular frame is subjected to vertical pressure, the force distribution of its four corners and frames is uneven. In order to improve this situation, reinforcing ribs are added to the corners or a rounded transition design is adopted. The circular frame has better stress distribution uniformity and can disperse external forces more effectively, but it may be slightly inferior to the rectangular frame in terms of space utilization.
Furthermore, the connection between the pull rod and the box body is the focus of mechanical design. This part needs to bear the tension of the pull rod as well as the gravity and impact force of the box. By using special connectors, such as thickened metal sheets or high-strength plastic connectors, and optimizing their connection methods, such as using strong methods such as riveting and bolting, it can be ensured that the connection parts will not loosen or break during frequent use.
In addition, the center of gravity distribution of the box must also be considered during design. A reasonable frame structure should keep the center of gravity of the box in a stable position after it is filled with items, avoiding additional overturning moments caused by the center of gravity shift during the pushing or pulling process, thereby reducing the uneven force on the frame structure.
At the same time, the wall thickness of the frame is also one of the factors affecting strength. Properly increasing the wall thickness can improve the bending and compression resistance of the frame, but it will also increase the weight of the trolley case. Therefore, it is necessary to balance strength and weight, and determine the optimal wall thickness through precise mechanical calculations and simulations.
In short, the strength design of the trolley case frame structure is a process that comprehensively considers many factors such as materials, geometric shapes, connection methods, center of gravity distribution and wall thickness. Only through scientific and reasonable mechanical design can we ensure that the trolley case has sufficient strength and stability in various usage scenarios and provide users with a reliable usage experience.
