Why are tractors all hung and semi-trailer pulled?
Replaced by semi trailers. Semi - trailer train is a train consisting of tow tractor and semi trailer. The rear axle trailer for single axis, also has the 2-3 axis, front bearing connecting device can be connected with a tractor after the saddle, a part of weight bearing by a tractor trailer, and the traction force to the semi trailer. In order to adapt to the different loading materials, semi trailers have tailgate boxes and platform two forms, a supporting device usually suspended in the front, picking and hanging can be put down with the trailer, stable stop. The semi-trailer train has large carrying capacity and good stability when driving. It is used more and more in the developed countries of automobile transportation, and develops towards heavy duty and specialization.
The popularization of expressway is the important reason that the full trailer is replaced by semi trailer, because the driving stability of the whole trailer is not as good as that of the bicycle and semi trailer, so it is forbidden to travel at high speed. This has caused the long-distance transportation vehicle to be unable to use the entire trailer the difficult position, certainly, also has been eliminated by many users.
The most popular period of full trailers in China is in the 70-90 century. The full trailer usually adopts the inflatable solid tire, the surface of the board is low, the loading capacity is large, and there is no danger of broken tires and flat tire. It is safe, simple and durable. The full trailer itself without power, need a tractor or forklift truck for towing, usually by one or more platform cars and a truck or tractor is composed of a line of vehicles to transport goods plane or large equipment handling work. Full trailer has been widely used in airports, ports, railway stations, factories and large warehouses, the use of full trailer greatly improved the efficiency of freight transfer and translation, reducing the cost of forklift and manpower costs.
Trailers are divided into two types: full trailer and semi trailer. The total weight of a trailer is called a full Trailer (or a trailer) for its own weight. Part of the total weight of the trailer is called a semi-trailer, which is taken by the tractor.
The structure of the car is different, and the performance of semi-trailer is much better than that of full trailer! The official is also supporting the development of "fuel economy better" semi-trailer.
