Semi-trailer is a trailer whose axle is placed behind the center of gravity of the vehicle and is equipped with a coupling device that can transmit horizontal and vertical forces to the tractor. It has no driving force of its own and needs to be connected to the tractor with the traction pin to achieve driving with the driving force of the main vehicle.
Compared with the full trailer, the semi-trailer is mainly used for long-distance cargo transportation, and it can be subdivided in type, and different types of semi-trailers are not the same for transportation of goods. For example, the dump semi-trailer is suitable for the transport of bulk scattered goods such as coal, ore, construction materials, low plate semi-trailer is suitable for the transport of vehicles, machinery and other heavy duty goods, the warehouse semi-trailer is mainly used for the transport of agricultural by-products and other light foam goods, tank semi-trailer is mainly used for the transport of liquids, bulk materials and bulk cement, etc. The van semi-trailer can be used for the transportation of household appliances, light textile goods, building materials and drawing goods.
What are the parts of a semi-trailer? In general, semi-trailer from the structure can be divided into frame, top, traction pin, suspension system, walking mechanism, electrical system, support devices, protective devices and trailer accessories.
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1, the frame, the main structure of loading goods, composed of girders, welded I-beams, support beams, connecting beams, side beams, locks, traction pin connection devices, panels, etc.
2, top, finger plate, gantry frame, etc., auxiliary frame loading goods.
3, traction pin, which is the semi-trailer and tractor connected, and withstand the traction to drive the trailer forward important components.
4, suspension system, used to connect the frame and the axle of the device, mainly used to support the load, slow down the impact of the dynamic load of the vehicle, generally can be divided into steel plate suspension, single point suspension, air suspension, rigid suspension four, there are differences in performance, need to be selected according to the use of the vehicle.
5, the walking mechanism, mainly refers to the axle system, steel rings and tires, the main role is to load and maintain the vehicle driving, support and distribute the load between the frame and the wheel.
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6, electrical system, composed of cables, gas, lamps, the main role is lighting, braking, safety warning.
7, the support device, the role is to support the trailer when the semi-trailer is unhung.
8, protective devices, generally can be divided into side protection and rear protection.
9, trailer accessories, such as tool boxes, spare tire frames, inserts and other small accessories.
Compared with monomer transport vehicles, semi-trailer has better comprehensive economic benefits, which can improve transportation efficiency by 30-50%, and reduce transportation costs by 30-40%, which has played a certain role in promoting the organizational form of the transportation industry.
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