Semi-trailer, this vehicle design is very clever, its axis position is very special, near the center of gravity of the vehicle, the advantage of this design is that when the vehicle is loaded evenly, the weight of the rear can be perfectly matched with the tractor. What’s more, it has a clever connection that easily transfers power to the tractor in front.
Speaking of the semi-trailer, it has no power of its own, and it has to rely on the tractor in front of it to run it. Its weight is partly shared by the tractor.
There are a lot of types of semi-trailers, and each has its own purpose:
- Self-dumping semi-trailer, this model is particularly suitable for transporting bulk goods such as coal, ore and building materials.
- Low plate semi-trailer, it can be used for a wide range of purposes, mainly used for long-distance cargo transport.
- Warehouse grid semi-trailer, this model is suitable for transporting agricultural products and other light goods.
- Tank semi-trailer, it is designed to transport liquid, bulk materials, such as cement.
- Van semi-trailer, this model is suitable for transporting household appliances, textile products, building materials, etc.
The structure of the semi-trailer is also very interesting, mainly composed of the following parts:
- The frame, which is the main part of carrying goods, is composed of girders, welded I-beams, supporting beams, etc.
- Tops, such as railings and gantry frames, which are used to help the frame load goods.
- The traction pin, which is the key part of the connection between the semi-trailer and the tractor, bears the traction force and allows the trailer to move along with the tractor.
- Suspension system, this system connects the frame and the axle, supports the load, and also reduces the impact of the goods during transportation.
- Walking mechanism, including axle, underwire and tire, which are responsible for load bearing and keep the vehicle running.
- Electrical systems, including cables, air circuits, lamps, etc., which are responsible for lighting, braking and safety warnings.
- Support device, when the semi-trailer and tractor are separated, this device can provide support.
- Protective devices, including side protection and rear protection, to protect the safety of vehicles and goods.
- Trailer accessories, such as toolbox, spare tire rack and other small accessories.
Compared with full trailers, semi-trailers are more popular in long-distance freight transportation. It has advantages in operability, safety, stability and cargo capacity, can significantly improve transportation efficiency, but also reduce transportation costs, and has played a role in promoting the development of the entire transportation industry.