Speaking of the main force of the current domestic transportation industry, semi-trailer absolutely dominates the world. With its own characteristics of high transportation efficiency, low transportation cost, strong carrying capacity, high efficiency, fast and relatively stable, semi-trailer plays an irreplaceable role in all kinds of general cargo transportation and special operations.

However, if you turn back the time, in the 1970s and 1990s, you will find that the domestic transport market was full trailer. Different from semi-trailer, full trailer can bear weight independently and keep balance after being separated from main vehicle, which can reduce the waiting time of main vehicle during loading and unloading of trailer; Secondly, the turning radius of full trailers is smaller than that of semi trailers, and the vehicle's trafficability is better on some poor road conditions. So at that time, almost all the transport vehicles running on the road were full trailer type.

Later, with the improvement of infrastructure capacity, the domestic road conditions are also improving. However, the number of full trailers is getting less and less, which is due to the following reasons:

1. Driving is difficult. Due to the structural design, the front axle of the full trailer generally has a steering function, which is relatively independent of the steering system of the main vehicle. Therefore, the tracking performance of the trailer is not as good as that of the semi-trailer, which is a test for the technical and psychological quality of the driver. Especially when reversing, it is more difficult to drive. If you are not careful, you will lock yourself, and the non veteran driver is not competent.

2. Poor driving stability. The drawbar/drawbar of the full trailer can swing up and down as well as left and right, which makes the full trailer more flexible, relatively, and greatly affects the stability of the full trailer at high speed, which is easy to lead to risks such as brake flapping, so it is not suitable for high-speed transport.

3. Braking distance is unstable. The connection between the full trailer and the main vehicle is mainly through the drawbar/traction frame. The gap in the middle is not fixed, and the coordination of the trailer is not as good as that of the semi-trailer. Therefore, the driver's technology and experience are also very tested when braking. If the driver cannot step on the brake in a timely and stable manner, the vehicle is likely to swing. In rainy and snowy weather, the braking skid is also likely to occur, affecting traffic safety.

4. The carrying capacity gradually lags behind semi-trailer. In the past, China's vehicle technology was relatively backward, and the transport capacity of the tractor could not be improved. Compared with a semi-trailer car, the full trailer+main vehicle can achieve loading in two cars, with obvious advantages in carrying capacity. However, with the continuous improvement of vehicle technology, the horsepower of the tractor continues to increase. In this way, the tractor can transport more goods. Even if the semi-trailer has only one carriage, it can also transport the same or even more goods than the full trailer. Considering the adaptability of the semi-trailer to complex road conditions, it presents a situation in which the latter takes the lead.

5. Explicit restrictions on statutory prohibitions. The 1995 Measures for the Administration of Expressway Traffic stipulates that full trailer tractors are not allowed to enter the expressway; The Road Traffic Safety Law of the People's Republic of China in 2003 once again specified that full trailer trailers and other motor vehicles with a design maximum speed of less than 70 kilometers per hour shall not enter the expressway.

So far, full trailers, which were once very popular in the transport market, have begun to decline, but this does not affect the brilliance of full trailers abroad, especially in European and American countries, where the population base is small, the land is sparsely populated, and the requirements for carrying capacity are not too high. In contrast, full trailers pay more attention to the functionality of trucks, which is obviously more advantageous than semi trailers; In addition, the vehicle auxiliary safety technology in Europe and America is relatively advanced, which can also make up for the defects of the full trailer to a certain extent. Therefore, the full trailer can be widely used both in the drop off and hitching transport and in various special vehicles.

Where will the domestic full trailer go? Can we only go to extinction?

In fact, full trailers play an important role in closed transportation environments such as coal yards, wharfs, warehouses, mines and stations by virtue of their flexible trafficability and ability to maintain balance independently. In some rugged road conditions, such as agriculture, animal husbandry and other fields, full trailers can also undertake some short distance transportation or special operations. In some industrial fields, such as product transfer or loading and unloading in machinery plants, full trailers can also be used for operations.

Only different from semi trailers, the tonnage of these trailers is relatively not concentrated, and there are also various differences in the design of appearance, track width, size, etc., which also led to the small number of their parts to a certain extent. Darong Axle has entered the market for more than 20 years, and has achieved fruitful results in the fields of high load-bearing axle pole, lightweight axle, customized production, etc. Its products are diversified. 1.5t-30t various disc bridges, drum bridges, low plate axle, eccentric bridges, special axle, etc. can be customized. It has passed the ISO9001 quality management system certification and has been exported to Europe, America, Australia and other countries for many times.