Container express logistics transportation has the advantages of good sealing, convenient turnover and large loading volume. At present, it has been widely used in the express logistics transportation industry that is developing at a high speed in many country. The container transportation semi-trailer has been widely used in the container logistics transportation industry due to its advantages of high transportation efficiency, easy to drop and hang, and convenient turnover. With the rapid development of my country's economy, the demand for express logistics and transportation is increasing day by day, and the market demand for container skeleton trailers is also increasing year by year. Due to the increasingly fierce market competition, and in recent years, the country has become more and more strict with environmental governance requirements, the pursuit of lightweight design and low-carbon environmental protection has become a major trend in the development of manufacturing. Therefore, with the advantages of light weight, high strength, long life, and high material recycling rate, the aluminum alloy container skeleton trailer will have higher and higher market demand, and the development of aluminum alloy container skeleton trailer is imperative.

Development Status of Aluminum Alloy container skeleton trailer

After Winton became the largest manufacturer of pneumatic automobiles in the United States in 1903, Winton built the first "car transporter" in order to solve the difficult problem of how to transport vehicles to customers. Thus, the prototype of the first semi-trailer was born. In the 1940s and 1950s, due to the rise of the automobile industry and the beginning of the American population shifting from cities to suburbs, the Federal Aid Highway Act was approved in 1956 to build a 41,000-mile (about 6,000 km) interstate highway network. Semitrailer+ The transportation mode of highway is more convenient and fast, and semi-trailer has also become a part of people's daily life.

Although China's truck and semi-trailer industry started late, with the rapid development of China's economy and the support of the developed express logistics industry, China's semi-trailer industry has achieved a blowout development. The types and functions of semi-trailers and related laws Regulations have been improved. The container skeleton trailer is more popular in the express logistics industry due to its advantages of good sealing, high efficiency, easy to think and hang, and convenient turnover.

However, with the development of science and technology and the update of materials, aluminum alloy materials have gradually replaced traditional steel with aluminum alloy semi-trailers in developed countries such as Europe, America and Japan due to the characteristics of light weight, high strength, corrosion resistance, long life and high material recycling rate. Semi-trailer. Today, the market of aluminum alloy semi-trailers in Europe and the United States accounts for 80%, and the market share of Japanese aluminum alloy semi-trailers has even reached more than 90%, while the market share of aluminum alloy semi-trailers in my country is very small.

In recent years, the state has become more and more strict in the management of overloading and overloading, and high-strength and lightweight semi-trailers are more and more favored by users. In order to cater to the market, meet the rapid development of express logistics needs, ensure that the interests of users are maximized, and minimize the self-weight of container skeleton trailers, the transport mode of aluminum alloy container skeleton trailer + aluminum alloy container will be the general trend of my country's logistics development in recent years.

Reasons for the popularity of aluminum alloy container semi-trailers

1. Light weight and good strength

The density of aluminum alloy is only 1/3 of that of iron. In the case of the same volume, the weight of the aluminum alloy frame is only one-third of the weight of the steel frame. However, the strength of aluminum alloy is relatively high, and the mechanical properties are better (see Table 1), which is close to or exceeds that of high-quality steel. The alloy container skeleton trailer has light weight, high strength, low fuel consumption, and can carry more goods to maximize transportation benefits.

2. Strong plasticity, easy to form, and efficient production

Aluminum alloy is extremely malleable, and can be extruded into various complex structures in one piece, which further improves the strength, reduces the complex production and processing links, and significantly improves the production efficiency. The aluminum alloy longitudinal beam profile is extruded at one time, and the I-shaped structure and the edge of the wing plate are added with protrusions, which not only reduces the self-weight, but also improves the strength of the longitudinal beam, and at the same time saves the ordinary steel longitudinal beam from the upper and lower wings and the web. The welding process is shown in Figure 1.

The aluminum alloy main beam profile is extruded at one time, and the C-shaped structure and the edge of the wing plate are increased. The aluminum alloy outrigger fixed iron profile is extruded at one time, with a type II structure. According to the length of the sawing machine, the complex production process of ordinary steel leg surface fixed iron shearing and assembly welding is omitted. It can be seen that the use of aluminum alloy profiles to replace traditional steel parts can not only reduce self-weight and improve strength, but also simplify the production process, effectively improve production efficiency and save labor costs.

3. Corrosion resistance, paint-free, green and environmental protection

Aluminum alloy materials have strong corrosion resistance, and the contact between aluminum and oxygen in the air will form a dense oxide film, which can prevent aluminum from continuing to react with oxygen to protect itself. Therefore, the aluminum alloy material does not need any anti-corrosion and anti-rust treatment such as rust removal and varnish, which greatly saves production costs and man-hours. In addition, the paint-free paint avoids the air pollution caused by the paint during the painting process, which is consistent with the national green environmental protection goal and is the only way for the development of semi-trailers in the future.

4. Long service life and high material recovery rate

Due to the strong corrosion resistance of alloy materials, aluminum profiles have a longer service life than carbon steel. According to statistics, the service life of steel semi-trailers is generally 7-9 years, while the service life of aluminum alloy semi-trailers can reach 15-20 years, which is equivalent to twice the service life of steel semi-trailers. In addition, the material recycling rate of the aluminum alloy container skeleton trailer is high. Compared with the current spot market, the price of aluminum ingots is about 4 times that of steel coils, and the price of aluminum when recycled is at least about 8 times that of steel. Therefore, for users, the longer service life and higher material recovery rate of aluminum alloy container skeleton trailers will be more and more favored by users in the future.

The future development trend of aluminum alloy container semi-trailer

Lightweight and better: In order to improve the working efficiency of the container transport vehicle, high-strength aluminum alloy materials are selected for the whole vehicle, and the structure is optimized with computer technology, and reasonable parts and components are selected, which not only improves the performance of the whole vehicle, but also Effectively increase the length of the body and reduce the self-weight, truly reduce the weight without reducing the load, and realize the rapid transportation of containers. Therefore, lightweight design will be one of the future development trends of container transport vehicles.