Product recommendation | DARO Low flatbed trailer axle

The low flat trailer axle is a typical semi-trailer support bridge, that is, we often say the rear bridge, which plays the role of bearing, braking, maintaining and so on. Different from the ordinary trailer axle, the low flat trailer axle belongs to a special type of axle, which is different from the ordinary trailer axle from appearance to performance.

1. What does a low flat trailer axle look like?

From the appearance of the low flat axle, it is better to distinguish from the ordinary drum brake bridge, and its wheel end part is smaller, such as the brake drum and the wheel hub, which are smaller than the ordinary trailer axle. This also results in low flat axle height from the ground is relatively small.

2, the characteristics of low flat trailer axle

Because the height of the axle of the low flat trailer is low from the ground, it is conducive to reducing the center of gravity of the vehicle to a certain extent, and the goods are more convenient to get on and off the vehicle, and the driving stability has been correspondingly improved. When the vehicle transport ultra-high goods walk on the height limit, the passability will be stronger.

Secondly, the wall thickness of the low flat axle is higher and the strength is greater. Compared with ordinary trailer axles, the 20Mn2 seamless steel tube wall thickness selected for low flat axles is higher, which can be intuitively seen from the cross section of the shaft tube below:

Not only the axle beam, low flat axle hub, brake drum, friction plate and other accessories are also dedicated, from strength to toughness to wear resistance, are fully up to standard.

3, low flat trailer axle application field

Low flat axle is mainly used in low flat semi-trailer.

Low plate semi-trailer in the industry commonly known as "big plate car", this type of vehicle is specially used for the transport of heavy vehicles, rail vehicles, mining machinery, forestry machinery, construction machinery and other non-removable large goods, can also be used for the transport of car vehicles.

In March 2020, the Ministry of Transport issued an announcement to redefine the technical specifications for low plate semi-trailers. In terms of the outer size limit, the original standard for low plate special semi-trailer requires length ≤13.75m, width ≤3m, height ≤4m, and the new requirement will put the width to 3.4m; In terms of quality parameters, the original standard requires a three-axis low plate preparation quality ≤10t, the new requirements are ≥42t, and the five-axis is ≥55t.

In this way, the loading capacity of the low plate semi-trailer can reach about 140 square meters, which is much higher than the volume of the standard van semi-trailer, and even equivalent to the total loading capacity of the front car + rear car with the middle axle.

This is also why the axle of a low flatbed trailer must have a low center of gravity, high wall thickness, and the use of high fixed accessories.

4, common specifications

5, the key production process of low flat trailer axle

① One-piece heat treatment molding process

The so-called one-piece axle refers to the shaft beam and shaft head created directly from a complete steel pipe. Through the heat treatment process, the raw material is heated to a certain temperature and maintained to reduce hardness and improve plasticity, and then the shaft beam and shaft head are molded through the molding process, and finally the selected speed and way are cooled. The connection between the shaft head and the shaft beam formed by one-piece heat treatment is more natural and strong, which can fully avoid welding deformation, ensure the accuracy and parameters of the shaft body, reduce the weight of the shaft body, enhance the connection strength of the shaft head and the shaft beam, and fully avoid the deformation and bending problem of the axle under high strength bearing.

② Automatic quenching and tempering

Quenching and tempering is a common process in steel treatment, and the mechanical properties of steel can be obtained through this treatment, which is a controlled heating and cooling process. Martensitic structure can be obtained by quenching, although it is hard, but too brittle, so it is often followed by a tempering process after the quenching process, so that it can weaken the brittleness, improve the toughness, and obtain the effect of hardness and toughness.

③ Shaft head fine grinding and intermediate frequency strengthening

The shaft head is the key part that connects the wheel end parts, and the higher the processing accuracy, the better the performance of the bearings, wheel hubs, brake drums, etc. that are installed later. This precision control is often refined to each borehole or thread.

In addition, the shaft head intermediate frequency strengthening treatment is also essential, especially the bearing connection part, only fully guaranteed strength, in order to ensure that the performance output at high frequency speed is more stable.

④ Automatic assembly of trailer axles

This is the most tedious process on the trailer axle production line, involving dozens of parts and hundreds of quantities. In order to ensure the quality of the finished product, DARO low flat trailer axle selected brake drum, hub, bearing and other key components are supplied by domestic manufacturers and through multiple quality testing, high degree of assembly line automation, assembly parameters and parts can be traced, stable and reliable quality, while with long service life, long maintenance cycle, easy maintenance and other characteristics.