With the increase of national efforts to control overload and the implementation of weight charging policy, heavy semi-trailer has gradually deviated from the development trend of the industry. Especially after the introduction of gb1589, the load capacity of semi-trailer has changed greatly from the original 55T to 46-49t. In order to realize multi load without overload, vehicle lightweight is the key.

Light semi-trailer is the product of the trend of lightweight. Light semi-trailer refers to a lightweight semi-trailer. The most important difference between light semi-trailer and ordinary semi-trailer is its self weight. Under the condition of equivalent load, model and size, light semi-trailer can be lighter than semi-trailer of the same specification by more than 15%.

Although the weight has been reduced, the carrying capacity has not changed. Taking the 13m semi-trailer as an example, the general self weight of the ordinary semi-trailer is 6.8t and can carry 34T goods, while the self weight of the light semi-trailer is 5.3t-6.3t, and the load capacity is the same as that of the ordinary semi-trailer. It can reduce the vehicle weight without affecting the vehicle safety performance, which is also one of the reasons for the emergence of light semi-trailer. The self weight is reduced, the load-carrying goods are increased, the fuel consumption is also reduced, and the economic benefits brought by the light semi-trailer to the owner are also increased.

What are the main means to reduce the weight of light semi-trailer?

1. Reduce plate thickness: use high-standard steel, with high strength, good toughness, fatigue resistance and lower self weight.

2. Reduce the weight of the rear axle: the axle of the semi-trailer plus the suspension is nearly two tons. The dead weight can also be reduced by reducing the weight of the rear axle.

3. Replace suspension: replace steel plate suspension with air suspension.

4. Reduce the weight of accessories: use lightweight vehicle accessories.

5. Suspended rear axle: it can be lifted when not in use to reduce its self weight.

It can be seen that selecting a lightweight axle and suspension is a common way for light semi-trailer to reduce weight, such as using disc axle with air suspension. At present, the main product of Darong heavy industry group, 13T disc axle, is the representative of lightweight axle. Low alloy seamless steel pipe is selected as raw material, and the mechanical properties of castings are fully stimulated through integrated axle tube heat treatment + one-time cold pushing technology. In terms of appearance, the axle tube adopts square design, locally strengthened treatment, wear resistance, crack resistance and high-strength load-bearing, The mechanical performance is greatly improved. With Darong's air suspension, it can provide safer and more stable protection, and help car owners adapt to the strict transportation environment of weight charging and double overload management.