Definition, classification and function of special vehicles
Defining a special vehicle: A special-purpose vehicle is a type of commercial vehicle. A special purpose vehicle refers to a device with special equipment and special functions for carrying out special transportation tasks or special operations and other special-purpose vehicles.
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Classification of special vehicles: Special vehicles can be divided into A van (van), B tank (tanker), C special dumper (special tipper), D lift truck (grane/life truck), E A box/stake truck and a special construction vehicle.
The specific instructions are as follows :
A: Special vehicle with closed structure compartment. The compartments can be independent or integrated into the cab. Such as: ambulances, cash trucks, refrigerated trucks, postal vehicles, television broadcast vehicles, etc.
B: The device has a tank-shaped container, such as a tanker, a fuel truck, a chemical liquid transport vehicle, and a powder transport vehicle.
C: equipped with a hydraulic lifting mechanism, which can unload the car or the tank or tilt the car (tank) to a certain angle, so that the cargo can be unloaded by its own weight or pushed horizontally. Such as dump trucks, car loading and unloading cars, swing arm garbage trucks.
D: The device has a lifting device or a lifting table. Including truck cranes, truck-mounted cranes, aerial work vehicles, ascending fire trucks, etc.
E: A cage with a cage or a fence structure. Such as: bulk grain transport vehicles, beekeeping vehicles and livestock transport vehicles.
F: It has various special structures such as a wooden frame structure and a flat plate structure. Used to undertake special operations, such as vehicle transport vehicles, wreckers, container transport vehicles, drilling locomotives, airport passenger elevators, etc.
The role of special vehicles : social and economic development of the car in terms of functions and performance requirements are getting higher and higher, ordinary cars can not meet the special requirements of various industries in various operations, therefore, a variety of special vehicles will It came into being. Its main role is:
1 Improve transportation efficiency and reduce transportation costs: such as semi-trailers, container vehicles, etc.;
2 to ensure the quality of goods transport, reduce the loss of goods: such as tank trucks, refrigerated trucks, etc.;
3 saving packaging, shortening loading and unloading time, saving manpower: such as bulk cement trucks, cement mixers, etc.;
4 to ensure the safety of cargo transportation, reduce environmental pollution: such as vans, garbage trucks, etc.;
5 expand the function of the car to complete specific tasks: such as aerial work vehicles, fire trucks, etc.
Special-purpose vehicles are generally modified on the basis of ordinary cars. There are also special special vehicles that are specially designed.
Power cables are used to transmit and distribute electric energy. Power cables are often used in urban underground power grids, internal power supply of enterprises, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater power transmission lines across rivers and seas.
In power lines, the proportion of cables is gradually increasing. Power cable is a cable product used to transmit and distribute high-power electric energy in the trunk line of power system.
The structure of power cable is relatively simple, which can be divided into conductor, internal and external insulation layer, sheath, armor layer and protective layer. The conductor is mainly made of copper and aluminum, which is used to conduct current. The insulating layer is usually wrapped around the conductor to isolate the conductor and so on. There are various types of power cables. If they are classified according to voltage, they can be divided into low-voltage, medium voltage, high-voltage, ultra-high voltage and ultra-high voltage cables.
Advantages
1. Small land occupation. Generally, it is buried in the soil or laid indoors, in ditches and tunnels. The insulation distance between lines is small, without poles and towers. It occupies less land and basically does not occupy space on the ground.2. High reliability. It is less affected by climatic conditions and surrounding environment, with stable transmission performance and high reliability.
3.It has more favorable conditions for the development of ultra-high voltage and large capacity, such as low temperature and superconducting power cables.
4.Less maintenance work.
5 The possibility of electric shock is low.
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