Domestic logistics has developed rapidly in recent years, followed by the rapid development of various tractors and semi trailers. The development of domestic heavy truck is like a hundred schools of thought, and the development momentum of various truck brands is good. For example, FAW Jiefang, Dongfeng Motor, China heavy truck, Auman, Shaanxi Automobile, Universiade, etc. have launched a variety of new trucks, and the semi-trailer supporting the truck tractor is also a thriving scene.

As gb7258-2017 requires that the semi-trailer, three axle rail plate and warehouse grid semi-trailer for the transportation of dangerous goods be equipped with disc brake and air (air bag) suspension as standard, which will be officially implemented from January 1, 2020, the vehicle use cost will be greatly increased. Therefore, the demand for a large number of products was released in advance, and the annual output of semi-trailer reached a historical peak. In 2019, China produced a total of 1.3848 million semi trailers, a year-on-year increase of 109.8%. Then the demand for trailer axles in 2019 will be as high as 4154400.

Due to the early release of the market demand for trailer axles, the development speed of trailer axles has been slow in recent years, and the implementation of the new national standard has led to a significant increase in the use cost of trailers. Recently, many people have begun to care about the price of second-hand trailer axles and hope to use second-hand axles to reduce the cost of vehicles.

So what brand does the old trailer bridge usually buy?

There are generally two brands of trailer axles in China: BPW and Fuhua. The premium ability of these two brands is too strong, and the price of the new axle is 30% - 80% higher than that of other brands at the same level. Taking the 13 ton drum axle as an example, other brands with the same configuration sell 3500, the price of Fuhua axle is about 4500-5000, and the price of BPW axle is 6500-7500, So we can see why truck drivers need second-hand Trailer bridges.

Is the old trailer bridge worth buying?

Although the old trailer bridge is cheaper, it is not recommended to buy it. Generally, the goods pulled by the trailer are heavy-duty, and the axle basically bears most of the weight of the semi-trailer. According to the observation, some sold second-hand suspension axles have been used for several years, and the parts that pull heavy goods every day have been used for several years, and their product performance cannot be the same as that of the new ones. There may be various problems such as axle deformation, bearing damage, brake system failure or hub damage. Although the brand trailer axle is second-hand, the price is not necessarily lower than the new axle of other manufacturers.

How should I choose the axle

First of all, we need to know what the axles on the market are like. Now the American axle is mainly on the market, which is characterized by good heavy load performance. The axle adopts the integrated extrusion process, I-shaped square beam and the special processing process of local thickening, which greatly improves the heavy load performance of the hanging car. There are about ten kinds of axle processing processes, each of which is indispensable. Without one of them, the axle performance will be reduced. At present, it is known that the treatment process of axle has about ten steps:

1. Raw material cutting

2. Hot rotary rolling

3. Shaft tube forming

4. Heat treatment heating of the whole pipe

5. CNC machining

6. Intermediate frequency induction processing

7. Precision grinding

8. Overall inspection of axle tube

9. Automatic gas shielded welding

10. Special equipment processing

11. Cleaning and drying

12. Product assembly

The above is probably the processing process required for a qualified axle. When we need to buy an axle, we can see the manufacturer's publicity or the processing process according to the axle products to judge whether the manufacturer has sufficient strength.