Why Did The Semi-trailer Break The Beam?
The reason of the manufacturer
1. Inferior steel for semi-trailer girders
The most direct and easy to understand reason is that the quality of the beam steel used by the trailer factory is not good enough to carry the designed load, resulting in the beam breaking.
2. Connect the girder web
In addition to reducing the size of the girder, some unscrupulous trailer manufacturers use two shorter steel bars to connect the webs of the girder to save costs, and the bearing capacity is definitely much worse than the whole one. Broken beam", users should pay attention to inspection when purchasing a car.
3. Reduce the size of the girder
The second is that the trailer factory cut corners to save costs. The main purpose is to reduce the size of the girders. Originally, there were 14 thick vertical plates, but they were reduced to 10 thick. However, the user did not know that, but they also pulled goods according to the 14 thick bearing capacity. middle.
4. Welding is not well welded
In addition to the fracture of the web, there are also cracks in the lower wings of the girders. There are two main reasons for this. One is the technical problem of the welder, and the other is that the voltage is unstable during welding, and the welding is not done well.
Second, light body hanging should pay more attention
There are also drivers and friends who use light body hangers to pay special attention. Light body hangers cannot be overloaded, let alone concentrated loads. High-strength steel beams have poor flexibility and are not suitable for bumpy roads. Be careful, otherwise the beams may be broken. Condition.
Reasons for use by users
1. Welding operation on the beam
It is also strictly forbidden to weld on the beam of the semi-trailer. Now the beam of the trailer is mostly high-strength steel. High-strength steel is easy to anneal when encountering strong current, and the beam is easy to break after annealing.
2. Overload or even concentrated load
In addition to the above reasons of the trailer factory, many broken beams are caused by improper use by users. The most common reason is long-term overloading, which is easy to understand. The load capacity exceeds the designed value of the trailer, and the beam can not bear the weight of the cargo, which causes it to break. Then there is the concentrated load, especially the now popular light body trailer, the concentrated load trailer is easy to break the beam.
3. The girders in mountainous areas bear too much twisting force
Trailers that often run in mountainous areas are prone to break the girders. The torsional force on the girders of trailers running in mountainous areas is much larger than that of those running on flat roads. The specifications of the upper and lower wings and webs of the girders must be larger, otherwise the girders will be easily broken.
