A comprehensive analysis of semi-trailer from classification to stru
Semi-trailer, a common transport model, occupies a decisive position in the transport field with its excellent bearing capacity and loading capacity. It can easily meet the transportation needs of various materials, so it is favored by drivers and friends. However, the structure of semi-trailers is diverse, the classification is detailed, and the relevant laws and regulations are quite complicated, which often confuses some card friends in details. Next, we will discuss some basic knowledge and core concepts of semi-trailer in depth to help you build a more comprehensive understanding.In order to facilitate users to have a better experience, 4 Axle High Fence Trailer Many attempts have been made to upgrade the products, and the results are also very good, and the market performance tends to be in a good state. https://www.semitrailerdirect.com/collections/fuel-tanker-trailer-xxl5h6vh
¢ Detailed explanation of semi-trailer model and national standard.
Semi-trailer, the right-hand man in the transportation field, plays an indispensable role in logistics and freight industry with its unique structural characteristics and wide application scenarios. Its axle is located behind the center of gravity of the vehicle, and it is equipped with a connecting device that can transmit vertical or horizontal force, which is connected with the tractor to form a semi-trailer train together. This type of vehicle includes not only truck semi-trailers used for cargo transportation, but also various special semi-trailers and sojourner semi-trailers to meet diversified transportation needs.
¢ Detailed explanation of trailer product model
When buying and using semi-trailers, card friends often come into contact with the announced model of semi-trailers. What kind of information does this string of letters and numbers contain? In fact, according to China’s car coding rules, this model has a clear meaning. The letter at the beginning of the code indicates the manufacturer of the semi-trailer, and the first digit is used to distinguish the vehicle category. For example, both the watch semi-trailer and the special semi-trailer are represented by 9. The next two figures reflect the total mass of the model. The last digit is the product serial code, followed by the letters indicating the classification code of the special vehicle, and the last part of the model is the enterprise-defined code.
Parameter limit of freight trailer series spectrum (GB/T6420-2004)
The national standard has formulated a series of detailed parameter limits for semi-trailers, covering the dimensions, axle load and mass. For different types of semi-trailers, such as integral closed box-type semi-trailer, container semi-trailer and tank-type semi-trailer of five-axle automobile train, the vehicle length is strictly limited, and the maximum length shall not exceed 13.0 meters. For the whole closed van semi-trailer used on high-grade highways, the vehicle length limit is relaxed to 14.6 meters. In addition, the length limit of vehicles transporting specific goods, such as low-flat trains, frame container trains and special semi-trailers, can be exempted from the standard under certain conditions.
¢ Understand the diverse classification of semi-trailers in all directions.
Semi-trailers can be divided into many types according to different classification standards. According to the number of axes, there are different choices such as 1 axis, 2 axis and 3 axis; The length of the announcement determines the size of the model, such as 8.6 meters, 10 meters, 11.16 meters, etc. In terms of tonnage, it provides a variety of different specifications such as 9T, 15T and 20T. In daily use, we usually classify and choose according to the vehicle type.
Barn semi-trailer
As a unique type of semi-trailer, the barn semi-trailer plays an important role in the freight field. Its design feature is that the cargo compartment part adopts the warehouse grid structure, which can flexibly adapt to the transportation needs of various goods and improve the transportation efficiency. In the national standard GB/T6420-2004, the parameter limit of the barn semi-trailer is also clearly defined to ensure its safe and efficient service to the freight industry.
Skeleton container semi-trailer
The skeleton container semi-trailer is an innovative design in the field of semi-trailer. Its cargo compartment adopts skeleton structure, which enables the vehicle to bear the container more stably in the transportation process and improve the transportation safety. In addition, this design also takes into account the transportation efficiency, making the skeleton container semi-trailer a right-hand man in the freight industry.
Double-bridge concave low flat trailer
Double-bridge concave low-flat trailer is one of the semi-trailer types, which is characterized by its unique concave design, which makes the vehicle have higher stability and safety during loading and transportation. In addition, this trailer is also suitable for a variety of transport scenarios, such as ordinary fence, semi-trailer of barn, semi-trailer of pulling coal, etc., and it is an indispensable and important equipment in logistics and freight industry.
¢ Analysis of key details of semi-trailer structure
Semi-trailer is a complex mechanical system composed of several key components. These components include carriage, frame, legs (supporting devices), suspension, axle (axle assembly), electrical circuit, protective net and toolbox. Each component has its unique function and function, which together constitute the stability and efficiency of semi-trailer.
As an important part of semi-trailer, the core function of carriage is to restrain and carry goods. There are various types of car railings, including large vertical, small vertical, flat, corrugated and embossed, etc., to meet different transportation needs. Usually, the thickness standard of the guardrail varies with the vehicle type and use. For example, the standard thickness of the guardrail is 1.5mm for ordinary vehicles, 1.2mm for light vehicles, and 2.0mm for heavy-duty coal haulers and dump semi-trailers to ensure safety and stability under extreme transportation conditions.
Hinge plays a vital role in the manufacture of carriage, which is responsible for connecting the carriage rail and the frame to ensure the smooth connection between them. According to different stress conditions, different forms of hinges will be selected, such as large hinges, small hinges, flat hinges and cast steel hinges.
The frame, the key part of the carriage manufacturing, is made of longitudinal beams, through beams and steel members welded by steel plates for vehicles, which constitutes a space frame-type stable structure. It not only carries the main load of the car body, but also is an important foundation for installing traction pins, suspension and support devices.
The floor of the trailer, as the part that the trailer directly contacts with the goods during daily loading, is also the most seriously worn part in the whole trailer. According to the different types of goods carried, the car floor is mainly made of different materials, such as 3mm flat plate, 4mm flat plate, 3mm diamond plate and 4.5mm diamond plate.
Leg, as a key device to support the front load of the semi-trailer after being detached, is composed of base, pull rod transmission mechanism, inner tube, outer tube, gearbox and control crank. According to its working principle, the leg can be divided into two types: single action and linkage. Each single-acting leg is equipped with a crank, while the linkage leg can control the actions of multiple legs with only one crank.
Suspension, as a key device for load transmission and shock absorption, covers many parts such as bracket, pull rod, upper and lower axle clamp, U-bolt, leaf spring and parallel arm. Leaf spring, as the core component, is firmly fixed on the axle by U-bolt, and its two ends are cleverly stuck in the frame bracket and connected in series by the balance arm, thus achieving self-balance in a certain range. The spring mainly bears the vertical gravity on the frame, while the horizontal force is transmitted through the lower axle clamp and the pull rod. In addition, by flexibly adjusting the pull rod, the parallelism of the shaft can be ensured, and then the abnormal wear of the tire can be avoided.
Wheel-axle assembly, a key component, covers many components such as tires, rims, hubs, brakes and axles.
The pneumatic system is an indispensable part of the wheel-axle assembly, which is mainly responsible for the braking function of the vehicle, including normal driving braking and emergency driving braking. The system consists of several components, such as gas connector, inflation pipeline, control pipeline, emergency relay valve, air reservoir and brake air chamber, which ensures the braking safety and reliability of the vehicle. At the same time, the circuit system also provides important functions of lighting and signal transmission for the wheel-axle assembly. It is connected to the tractor through a seven-star plug, and its wiring is usually carefully hidden inside the frame, which not only ensures safety but also does not affect the beauty of the vehicle.
Fence is an important safety facility in wheel-axle assembly, which can effectively prevent external objects from invading the lower part of the car body, play a key role in protection and blocking, and ensure the safety of vehicles and passengers.
Toolbox is one of the important materials carried with the vehicle, which is mainly used to hold various tools, ponchos and ropes, so as to ensure that it can be accessed at any time during driving. This kind of toolbox is usually arranged on the side or back of the car body to facilitate the driver’s access.