The unique structure of semi-trailer has a profound impact on the development of the industry. The frame is divided into straight beam type and gooseneck type, the straight beam is general, easy to modify, suitable for general freight; Gooseneck reduces the center of gravity, which improves stability and space utilization when transporting high-center of gravity cargo such as containers. The axles have leaf springs and air suspension depending on the number of loads. The leaf spring has low cost and is mostly used for short and medium distance and cost sensitive transportation; The air suspension can automatically adjust according to the load and road conditions, and the shock absorption effect is good, which is conducive to the protection of precision and high-grade goods. The semi-trailer is connected with the tractor by traction pin and traction seat, and the brake is divided into drum type and disc type. The drum braking force is large but the heat dissipation is poor, and the disc braking has excellent heat dissipation and strong stability, so it is used widely in high-speed and heavy-duty transportation.
In terms of transportation efficiency, various structures adapt to different goods and improve loading flexibility. The plate semi-trailer is easy to load and unload large goods, the van semi-trailer can rationally place the goods, and the foldable or telescopic structure semi-trailer can flexibly adjust the space to improve the single transport volume; At the same time, the reasonable frame and suspension reduce the weight of the car, and the air suspension makes the driving more stable and faster. In terms of safety performance, the solid frame and reasonable axle layout ensure the stability of the body and reduce the risk of rollover; Advanced disc brake and reliable connection structure ensure reliable braking and cooperative stability during driving.
At the level of technological innovation, due to the lightweight and high strength demand for semi-trailers, the application of lightweight high-strength materials such as aluminum alloy is gradually increasing, and intelligent structural design is also promoted, such as sensors installed in the frame and axle to monitor the status of the vehicle in real time, and intelligent suspension automatic adjustment. In the market pattern, the unique structural design brings product differentiation, high-end logistics favors advanced semi-trailers, and the low-end market tends to be simple and low-cost products; This also promotes the integration of the industry, large enterprises with advantages in R & D and innovation, eliminate backward enterprises, improve the overall technical level of the industry, and promote the industry to scale and intensive development.
