Semi trailer is a kind of vehicle with high frequency in modern logistics and transportation industry, which is composed of tractor and semi-trailer. Usually, tractor and semi-trailer have their own license plate numbers, and the license plate of semi-trailer has one more hanging word than that of tractor.

Usually, the "front" mentioned by car owners is actually a popular name, which refers to the tractor. The tractor is the source of driving power of the semi-trailer. It has driving capacity and drives the semi-trailer through the connecting device. It can also drive independently from the semi-trailer.

Opposite to the front of the vehicle is the "body", which refers to the semi-trailer behind the tractor. It is mainly used to load goods. Generally, it does not have driving force and needs to drive with the help of the tractor. According to different vehicle bodies, it can be divided into low flat semi-trailer, warehouse grid semi-trailer, container semi-trailer and so on, which are respectively used for different cargo transportation.

The head of semi-trailer bears the driving function of the vehicle and directly determines the forward power of the vehicle. At present, the head price of semi-trailer in the market is generally between 250000 and 320000. Depending on the selected brand and model, there are also many brands that have done well in the domestic semi-trailer tractor industry, such as heavy truck, Jiefang, Shaanxi Automobile, Universiade, Auman, Sany, Dongfeng, CIMC and Gongxiang. Owners can refer to them when purchasing.

Compared with the front, the price of semi-trailer body is much cheaper, generally about 90000. The main components of the body include frame, outrigger, gantry, column, suspension, axle, tire, protection, etc. the axle is the key component related to the load-bearing performance of the body and whether the braking is sensitive or not. At the same time, it cooperates with the tire to maintain the driving of the vehicle.

Nowadays, the trend of lightweight in the semi-trailer industry is prevalent, and so is the axle. More and more brands launch the main lightweight products in order to achieve the overall weight reduction of vehicles through their own weight reduction. However, different from other components, the main function of the axle is load-bearing. How to realize lightweight without affecting the load-bearing capacity of the axle still requires certain strength and technical skills.

As an earlier axle enterprise in China, Darong heavy industry group has made good achievements in the field of axle lightweight. The Darong axle produced by Darong heavy industry group has selected one-piece high-quality low alloy seamless steel pipe with lighter weight and better firmness from raw materials. It has been built through 15 precision production processes and added unique processes to greatly improve the strength and durability of the products Toughness and ductility, reduce the product weight by 10% - 25%, save oil and increase efficiency, and bring higher business benefits to the majority of car owners.