In the transportation industry, there is a special kind of semi-trailer. Their length and width are different from ordinary semi-trailer. Their tires are smaller and more than ordinary semi-trailer. They even get the common name of "crawling all over the ground". For example, the three-line six axle semi-trailer often mentioned by car owners.

So, what is "three lines" and "six axes"? What does a three line six axle semi-trailer look like?

Three line six axle semi-trailer, popularly speaking, is the semi-trailer behind the tractor, which is designed with three rows of wheels, which is "three lines"; A row of wheels have two axles in parallel, which adds up to six axles, which is "six axles"; Two tires are installed at both ends of an axle, that is, four tires are installed on one axle, and a total of 24 tires are installed on six axles. The reason why so many tires are designed is that this kind of semi-trailer is mostly used to transport large goods, which is often referred to as large transport vehicles.

In fact, in addition to the three line six axle vehicles, there are four line eight axle, five line ten axle, and the uncommon six line twelve axle, seven line fourteen axle and other models, which belong to large-scale transport vehicles, which are specially used to transport large non detachable goods. Generally speaking, large cargo transport vehicles belong to transport companies with large cargo transport qualification, and their operation qualification can be divided into four categories according to equipment and personnel:

Class I refers to class I large objects that can be transported up to 100 tons; Class II refers to that on the basis of being able to carry class I goods, it can carry class II large objects, with a maximum limit of 200 tons; By analogy, the higher the category, the higher the level of goods that can be transported, up to 300 tons and above. Generally, the three lines and six axes can transport large goods less than 80 tons, the four lines and eight axes can transport large goods less than 100 tons, the five lines and ten axes can transport large goods less than 120 tons, and so on.

Except for the three-line six axle semi-trailer, all other models need to apply for a temporary license plate, which is generally valid for only one month. If it is exceeded, it needs to be reissued in advance. In addition, it shall also operate according to the regulations on the transportation line or transportation time.

Compared with ordinary semi-trailer, the advantages of three lines and six axles are large load capacity, uniform axle load and small turning radius. At the same time, the longitudinal tie rod adopts double row form, which can reduce the left-right swing during vehicle driving; Of course, there are also some disadvantages, such as exposed tire loading, poor discharge of goods or poor foot fixation, etc.

In addition, due to the special goods transported by the three-line six axle semi-trailer, the requirements for the performance of the vehicle are higher than those of the ordinary semi-trailer, especially the chassis axle of the vehicle, which is directly related to the bearing capacity of the vehicle. High specification products with reliable quality and stiffness and strength must be selected.

Darong group is an enterprise specializing in the R & D and production of commercial axles in Liangshan, Shandong. It has been deeply cultivated in the axle industry for 20 years and is famous for its high cost performance. All axles produced by Darong have gone through 15 high-precision processes, and the products have excellent comprehensive mechanical properties such as strength, toughness and ductility. Darong axle adopts the integrated axle body building technology, which changes the traditional three joint welded axle body, greatly improves the load capacity of the axle, and can customize the special axle according to the actual needs of customers to meet the diversified use needs of car owners.