Why is a semi-trailer called a semi-trailer Is there a full trailer
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Semi-trailer and full trailer, the two names are only one word apart, but they are very particular! I just came back from a survey of a logistics park. The neat rows of semi-trailers in the park reminded me that many riders asked me this question: Why are semi-trailers called “semi-trailers”? Is there a full trailer? What is the difference between them? This car, it’s interesting! Today, the senior schoolmate will thoroughly explain these two models to all riders from the structure to the use.
Why is it called a “semi-trailer”?
Semi-trailer is called “semi-trailer” because of its structural characteristics.
To put it simply, the wheels of a semi-trailer are generally installed at the rear end of the carriage, and they cannot stand independently. It is necessary to put the front end of the trailer on the saddle behind the tractor.
This design makes the trailer and the tractor bear part of the weight of the carriage, and the tractor not only provides forward traction, but also provides the force to support the goods upward.
The trailer only bears part of the weight of the goods, so it is called “semi-trailer”.
Imagine that a semi-trailer is like a big guy with only hind legs, and it needs to lie down on the tractor in front to stand firm.
In the state of separation, the semi-trailer needs to use special legs to keep its balance, just like building a small bench, otherwise it will “fall down”.
Full trailer: Is it really “full”?
In contrast, the full trailer is much easier to understand.
Wheels are installed at the front end and rear end of the full trailer, so that it can stand independently and stably, and there is no need to “lie down” on the tractor.
When it is connected with the tractor, it is only connected through the traction device, and the tractor only provides forward pulling force and does not share the weight of the goods.
In other words, the full trailer itself fully bears the weight of the goods, so it is called “full trailer”.
For example, a full trailer is like an independent individual with front and rear legs. It only needs a tractor to pull it away, and it can carry the weight of all the goods by itself.
This car, something!
Semi-trailer VS Full Trailer: A Practical Comparison
Many riders may ask: Since the full trailer can be independently supported and looks more powerful, why is the semi-trailer more common?
The reason is simple: the semi-trailer has better handling when turning and reversing.
Because the front end of the semi-trailer rides on the tractor, a hinge point is formed, and the turning radius is smaller, which is especially suitable for driving on urban roads and narrow spaces.
Although the full trailer can be supported independently, it needs more space when turning and is more difficult to control.
In addition, the connection between the semi-trailer and the tractor is more stable and safer when driving at high speed.
When the full trailer is driving at high speed or braking urgently, it may appear the phenomenon of “pushing the head”, which will affect the driving safety.
Don’t forget the center axle trailer.
When it comes to trailer types, there is also a “middle school”-the middle axle trailer.
Its shape is similar to that of a full trailer, and it can also bear its own weight independently, without being shared by a tractor.
However, the difference is that the axle of the center axle trailer is concentrated in the middle part of the carriage, so it can’t be balanced independently, and it also needs leg support when it is separated from the tractor.
This “three unlike” design has unique advantages in some specific scenarios, such as urban distribution and other occasions.
However, under the complicated and diverse road conditions in China, its application scope is limited.
Development prospect of semi-trailer
In recent years, new transport vehicles, such as mid-axle trailers and automobile trains, are in full swing, so will the prospect of semi-trailers be compressed?
The answer is no.
Semi-trailer will still occupy the main position of transportation for a long time.
The reasons are as follows:
Strong adaptability: China’s terrain is diverse and the road conditions are complex. After years of development, semi-trailers have stronger adaptability.
Good stability: compared with emerging models, semi-trailer is more stable and has a higher safety factor.
Cost advantage: low initial purchase cost and strong adaptability to all kinds of goods.
International trend: In developed countries in Europe and America, semi-trailers account for 70%-80% of the total transportation.
After so many years of traveling, my senior sister found that many new technologies and models were very popular at first, but few of them finally gained a foothold in the market.
Semi-trailers have been popular for so many years, which has its own reasons.
Types of semi-trailers
Semi-trailer is not just a model, but a huge family.
According to the different transportation needs, the upper part of semi-trailer is also different:
Fence plate: the most common semi-trailer type, surrounded by fences, suitable for transporting all kinds of ordinary goods.
Warehouse-gate type: the side is designed with a fence, which is convenient for loading and unloading large goods.
Van type: closed carriage, suitable for transporting goods that need dustproof and rainproof.
Skeleton: a frame structure specially used for transporting containers.
Container-type: Semi-trailer with directly integrated container.
Tank type: tank design for transporting liquid or gas.
Low flat type: the bottom of the carriage is low from the ground, which is convenient for loading and unloading heavy machinery.
Self-unloading semi-trailer, which can automatically unload, is often used to transport coal, sand and gravel.
There are so many kinds, each of which has its own specific application scenarios, which is one of the reasons why semi-trailers can occupy a dominant position in logistics and transportation.
Senior sister has something to say
From a technical point of view, semi-trailer and full trailer have their own advantages, and which one to choose should be decided according to actual demand.
For long-distance transportation and large goods, semi-trailer is more suitable;
For short-distance transportation and light goods, the full trailer may have more advantages.
In the future, with the continuous development of China’s logistics and transportation industry, the trends of lightweight, standardization, specialization, intelligence and remote control will become more and more obvious.
Semi-trailers will also develop in a more environmentally friendly, intelligent and efficient direction.
Dear riders, what kind of trailer is common around you? Welcome to share your opinions and experiences in the comments section!
Senior Q&A time: If you have any other questions about semi-trailer and full trailer, please leave a message in the comment area, and I will choose the hot questions to answer!