Trailer is an entry we often see in books. For example, in the question bank of the driver's license test, it is often seen that "vehicles are not allowed to tow trailers during the internship period", which refers to the behavior of using vehicles to tow the rear compartment. In fact, in addition to this layer of the meaning of the verb, the tractor trailer also specifically refers to a vehicle that is widely used in the logistics and transportation industry.
In general, a tractor-trailer refers to a vehicle that has no driving capacity by itself and is mainly used to provide cargo loading space and bearing capacity, and relies on the traction power provided by the tractor in front to achieve driving. With the continuous development of the automotive industry, more and more traction models are emerging.
In terms of types, tractor trailers can be mainly divided into full trailers, semi-trailers, central axle trailers and light tractor trailers. Today, we mainly learn about the full trailers and semi-trailers.
1. What is full trailer and semi trailer?
A full trailer, which means that a full trailer is attached to the rear of an ordinary car, and the two are connected by a hook. Full trailers can increase the loading capacity of trucks and reduce fuel consumption, thereby reducing transportation costs;
A semi trailer, which itself has no power, is composed of a tractor behind a semi-trailer, which is supported on the tractor through the tractor of the semi-trailer.
2. Compositions of full trailer and semi-trailer
A full trailer is generally composed of a frame, a body, a traction device, a steering device, a suspension, a walking system, a braking system, and a signal system;
A semi-trailer is generally composed of frame, bodywork, traction pin, suspension system, running mechanism, electrical system, support device, protective device and trailer accessories.
Compositions of full trailer and Semi-trailer are different.
3. Loads of full trailer and Semi-trailer
The load of the full trailer is fully borne by itself, and is only connected to the main vehicle by hooks. The main vehicle does not need to bear the load of the trailer, but only helps the trailer to provide power;
The semi-trailer needs the main vehicle to provide a support point, and the main vehicle is responsible for providing power and also bears half of the trailer load.
Load of full trailer and Semi-trailer are different.
The full-trailer stand by its own tires, and the semi-trailer needs to rely on the front legs.
5. Front wheels
The full trailer has a front wheel, and the semi-trailer has no front wheel.
6. Uses of full trailer and Semi-trailer
Full trailers are mainly used for transportation in docks, factories, ports and other fields; Semi-trailers are mainly used for long-distance cargo transportation.
The semi-trailer mainly transports bulky goods that are bulky and difficult to disassemble. The trailers on the road are mostly semi-trailers; the most representative semi-trailer is the train.
Semi-trailers are divided into the following 11 types according to different uses:
(1). Self-unloading semi-trailer/dump trailer: mainly suitable for the transportation of bulk and scattered goods such as coal, ore, construction materials, etc. The dump trailers can be divided into rear dump trailers and side dump trailers.
(2). Low flatbed semi-trailer: for medium and long-distance freight transportation;
(3). Shed-type semi-trailer: mainly used for the transportation of agricultural and sideline products and other light foam goods;
(4). Container semi-trailer: mainly used for logistics and transportation supporting ships, ports, routes, highways, transfer stations, bridges, tunnels, and multimodal transportation;
(5). Tank semi-trailer: mainly used for transporting liquids, bulk materials and bulk cement, etc., including fuel tanker trailers, water tanker trailers, bitumen tanker trailers and cement bulker trailers.
(6). Van semi-trailer: mainly used for the transportation of household appliances, light textile goods, coal, sand and gravel and other building materials, as well as the transportation of palletized goods;
(7). Oil semi-trailer: mainly used for large oil transportation;
(8). Light semi-trailer: there are many transport objects, which are equivalent to the weight of ordinary vehicles;
(9). Vehicle transport semi-trailer: mainly used to transport passenger vehicles such as cars, vans, commercial vehicles, jeeps, etc.;
(10). Powder material transportation semi-trailer: mainly used for bulk cement, fly ash, cement, lime powder, ore powder and other particle transportation;
(11). Chemical liquid transport semi-trailer: mainly used for transporting chemical liquid, stainless steel, carbon steel, plastic steel, glass fiber reinforced plastic, aluminum cans, all-plastic cans, etc.
7. Advantages of full trailer and Semi-trailer
Advantages of full trailers
Because the tow bar or the tow frame of the full trailer can swing up and down and side to side relative to the car body, it is more advantageous for the full trailer to drive on uneven mountainous areas or rough roads.
Advantages of semi-trailers
high stability, fast speed and large load capacity. In particular, some large goods can only be pulled by semi-trailers, and other trailers are not long enough.
Believe it or not, the advantages of full trailer and semi-trailer are different.
Disadvantages of full trailers
The main reason is that the full-trailer has poor stability when driving at high speed, and is prone to deadly hidden dangers such as brake flicking, and it will also cause major traffic accidents due to the breakage of the traction frame.
Disadvantages of semi-trailers
The turning radius is too large, because the distance from the front of the trailer to the wheels of the trailer is too long, which requires higher road conditions.
Believe it or not, the disadvantages of full trailer and semi-trailer are different.
Due to their different structures, full trailers and semi-trailers have their own advantages and disadvantages in different dimensions. Both of them use their own advantages to continue to play a role in their respective fields, making continuous contributions to improving logistics and transportation efficiency, reducing logistics costs, energy saving and emission reduction, and protecting the environment.