2, low flat car bridge is mainly used in what field?
Low flat truck bridge is a special bridge for low flat semi-trailer.
Top semi trailer manufacturers says Low flat semi-trailer, commonly known in the industry as the big board, such as 17.5 or 13.75 large board. According to the announcement, this type of semi-trailer is specially used to transport heavy vehicles, rail vehicles, mining machinery, forestry machinery, construction machinery and other heavy goods that cannot be dismantled, and can also be used to transport car vehicles.
The structure of low plate semi-trailer is typically concave beam frame, that is, the front section is gooseneck, the middle section is the cargo platform, and the rear section is the wheel frame. There is no fence plate around. When loading and unloading, the mechanical equipment is moved from the rear wheel frame or the wheel is removed, and then the mechanical equipment is fixed on the semi-trailer.
Compared with other types of semitrailers, low plate semitrailers have a lower center of gravity, so they have better stability and safety during transportation. In addition, they have a better ability to pass through the height limits when transporting ultra-tall loads.
Low flat car bridges can precisely meet this transportation demand. Because its height from the ground is shorter than other vehicle bridges, it is more conducive to reducing the center of gravity of the vehicle and improving the transportation stability. In addition, it is more convenient to get on and off the vehicle and helps improve the vehicle's stability.
3. Performance requirements of low flat car bridge
As a special axle for low flat plate trailer, low flat plate axle is different from ordinary axle in performance requirements. Let us first look at the technical standards related to low flat trailer.
In March 2020, the Ministry of Transport issued an announcement, redefining the technical specifications of low plate semi-trailer. In terms of the outer size limit, the original standard of the special semi-trailer for low flat plate requires length ≤13.75m, width ≤3m, height ≤4m, and the current requirement will put the width at 3.4m; in terms of quality parameters, the original standard requires that the quality of the three-axis low flat plate is less than or equal to 10t, and the current requirement is that the three-axis is more than 42t and the five-axis is more than or equal to 55t.
Compared with other types of semitrailers, the maximum loading capacity of low plate semitrailers is 140 square meters, considerably higher than the volume of standard van semitrailers, and even equivalent to the total loading capacity of front car + rear car with middle axle.
This requires a low flat car bridge in the center of gravity is low, strong usability at the same time, but also have higher strength and bearing capacity than ordinary trailer bridge, more stable.
Taking Dairong low flat truck bridge as an example, its raw material is a high strength 20Mn2 seamless steel pipe with higher wall thickness. The difference between it and ordinary trailer bridge wall thickness can be directly seen from the section diagram below.
The higher the wall thickness, the higher the strength, the stronger the corresponding bearing performance, transportation stability and security can be further guaranteed.
In addition, is the choice of accessories, Darong low flat car bridge brake drum, brake pads, bearings, hubs, bolts, grease, etc., are heavy-duty semi-trailer dedicated to high fixed products, whether it is strength, toughness or heat capacity, wear resistance, can better meet the transport needs of low flat trailer.
4, the key technology of low flat car bridge
The production of axle usually has to go through a series of processes such as heat treatment, sandblasting, straightening, rust prevention, finishing, welding, etc. Next, let us understand the most critical processes in the production process of low flat axle.
1) One-piece heat treatment forming process
The so-called one-piece axle refers to the shaft beam and shaft head created directly from a complete steel pipe. Typically, the raw materials are heated to a certain temperature through heat treatment process and maintained to reduce hardness and improve plasticity, and then the shaft beam and shaft head are molded through the molding process, and finally the selected speed and way of cooling.
Different from the traditional "three-piece" axle, the "one-piece" heat-treated shaft head and shaft beam are connected more naturally and firmly, which can not only completely avoid welding deformation, ensure the accuracy and parameters of the shaft body, but also reduce the dead weight of the shaft body, enhance the connection strength of the shaft head and shaft beam, and completely avoid the deformation and bending of the axle under extreme strength bearing.
2) Automatic quenching and tempering
Quenching and tempering is a common process in steel treatment, through which the mechanical properties of steel can be obtained. It is a controlled heating and cooling process.
Martensitic structure can be obtained through quenching. Although it has great hardness, it is very brittle, so it is usually followed by a tempering process after quenching process. In this way, brittleness can be weakened, toughness can be improved, and the effect of hardness and toughness can be reached.
3) Shaft head fine grinding and intermediate frequency strengthening
The shaft head is the key part of connecting the wheel end parts. The higher the processing accuracy, the better the performance of the bearings, hubs and brake drums installed later. This precision of control is usually refined to each borehole or thread.
In addition, the shaft head intermediate frequency strengthening treatment is also essential, especially the bearing connection part. Only when the strength is completely guaranteed can the performance output be more stable at elevated frequency speed.
What is the difference between low flat car bridge and ordinary trailer bridge
As a typical support bridge, the rear axle of trailer plays an essential role in the fields of load bearing, braking, driving and even auxiliary shock absorption. In general, the trailer rear axle can be divided into two categories: disc type and drum type. The subdivision can cover low flat car bridge, three-line six-axle, eccentric bridge, special bridge and so on. Today, we will focus on the low flat car bridge.
1. What does a low flat car bridge look like?
From the appearance, low flat car bridge and ordinary trailer bridge are better to distinguish.
In general, the wheel end part of the low flat car bridge, such as the brake drum and hub, is smaller than the ordinary axle, thus the shaft beam is shorter from the ground.
Why do low flat car bridges adopt such a shape design? This also starts from its application field and application requirements.
2, low flat car bridge is mainly used in what field?
Low flat truck bridge is a special bridge for low flat semi-trailer.
Top semi trailer manufacturers says Low flat semi-trailer, commonly known in the industry as the big board, such as 17.5 or 13.75 large board. According to the announcement, this type of semi-trailer is specially used to transport heavy vehicles, rail vehicles, mining machinery, forestry machinery, construction machinery and other heavy goods that cannot be dismantled, and can also be used to transport car vehicles.
The structure of low plate semi-trailer is typically concave beam frame, that is, the front section is gooseneck, the middle section is the cargo platform, and the rear section is the wheel frame. There is no fence plate around. When loading and unloading, the mechanical equipment is moved from the rear wheel frame or the wheel is removed, and then the mechanical equipment is fixed on the semi-trailer.
Compared with other types of semitrailers, low plate semitrailers have a lower center of gravity, so they have better stability and safety during transportation. In addition, they have a better ability to pass through the height limits when transporting ultra-tall loads.
Low flat car bridges can precisely meet this transportation demand. Because its height from the ground is shorter than other vehicle bridges, it is more conducive to reducing the center of gravity of the vehicle and improving the transportation stability. In addition, it is more convenient to get on and off the vehicle and helps improve the vehicle's stability.
3. Performance requirements of low flat car bridge
As a special axle for low flat plate trailer, low flat plate axle is different from ordinary axle in performance requirements. Let us first look at the technical standards related to low flat trailer.
In March 2020, the Ministry of Transport issued an announcement, redefining the technical specifications of low plate semi-trailer. In terms of the outer size limit, the original standard of the special semi-trailer for low flat plate requires length ≤13.75m, width ≤3m, height ≤4m, and the current requirement will put the width at 3.4m; in terms of quality parameters, the original standard requires that the quality of the three-axis low flat plate is less than or equal to 10t, and the current requirement is that the three-axis is more than 42t and the five-axis is more than or equal to 55t.
Compared with other types of semitrailers, the maximum loading capacity of low plate semitrailers is 140 square meters, considerably higher than the volume of standard van semitrailers, and even equivalent to the total loading capacity of front car + rear car with middle axle.
This requires a low flat car bridge in the center of gravity is low, strong usability at the same time, but also have higher strength and bearing capacity than ordinary trailer bridge, more stable.
Taking Dairong low flat truck bridge as an example, its raw material is a high strength 20Mn2 seamless steel pipe with higher wall thickness. The difference between it and ordinary trailer bridge wall thickness can be directly seen from the section diagram below.
The higher the wall thickness, the higher the strength, the stronger the corresponding bearing performance, transportation stability and security can be further guaranteed.
In addition, is the choice of accessories, Darong low flat car bridge brake drum, brake pads, bearings, hubs, bolts, grease, etc., are heavy-duty semi-trailer dedicated to high fixed products, whether it is strength, toughness or heat capacity, wear resistance, can better meet the transport needs of low flat trailer.
4, the key technology of low flat car bridge
The production of axle usually has to go through a series of processes such as heat treatment, sandblasting, straightening, rust prevention, finishing, welding, etc. Next, let us understand the most critical processes in the production process of low flat axle.
1) One-piece heat treatment forming process
The so-called one-piece axle refers to the shaft beam and shaft head created directly from a complete steel pipe. Typically, the raw materials are heated to a certain temperature through heat treatment process and maintained to reduce hardness and improve plasticity, and then the shaft beam and shaft head are molded through the molding process, and finally the selected speed and way of cooling.
Different from the traditional "three-piece" axle, the "one-piece" heat-treated shaft head and shaft beam are connected more naturally and firmly, which can not only completely avoid welding deformation, ensure the accuracy and parameters of the shaft body, but also reduce the dead weight of the shaft body, enhance the connection strength of the shaft head and shaft beam, and completely avoid the deformation and bending of the axle under extreme strength bearing.
2) Automatic quenching and tempering
Quenching and tempering is a common process in steel treatment, through which the mechanical properties of steel can be obtained. It is a controlled heating and cooling process.
Martensitic structure can be obtained through quenching. Although it has great hardness, it is very brittle, so it is usually followed by a tempering process after quenching process. In this way, brittleness can be weakened, toughness can be improved, and the effect of hardness and toughness can be reached.
3) Shaft head fine grinding and intermediate frequency strengthening
The shaft head is the key part of connecting the wheel end parts. The higher the processing accuracy, the better the performance of the bearings, hubs and brake drums installed later. This precision of control is usually refined to each borehole or thread.
In addition, the shaft head intermediate frequency strengthening treatment is also essential, especially the bearing connection part. Only when the strength is completely guaranteed can the performance output be more stable at elevated frequency speed.
2, low flat car bridge is mainly used in what field?
Low flat truck bridge is a special bridge for low flat semi-trailer.
Top semi trailer manufacturers says Low flat semi-trailer, commonly known in the industry as the big board, such as 17.5 or 13.75 large board. According to the announcement, this type of semi-trailer is specially used to transport heavy vehicles, rail vehicles, mining machinery, forestry machinery, construction machinery and other heavy goods that cannot be dismantled, and can also be used to transport car vehicles.
The structure of low plate semi-trailer is typically concave beam frame, that is, the front section is gooseneck, the middle section is the cargo platform, and the rear section is the wheel frame. There is no fence plate around. When loading and unloading, the mechanical equipment is moved from the rear wheel frame or the wheel is removed, and then the mechanical equipment is fixed on the semi-trailer.
Compared with other types of semitrailers, low plate semitrailers have a lower center of gravity, so they have better stability and safety during transportation. In addition, they have a better ability to pass through the height limits when transporting ultra-tall loads.
Low flat car bridges can precisely meet this transportation demand. Because its height from the ground is shorter than other vehicle bridges, it is more conducive to reducing the center of gravity of the vehicle and improving the transportation stability. In addition, it is more convenient to get on and off the vehicle and helps improve the vehicle's stability.
3. Performance requirements of low flat car bridge
As a special axle for low flat plate trailer, low flat plate axle is different from ordinary axle in performance requirements. Let us first look at the technical standards related to low flat trailer.
In March 2020, the Ministry of Transport issued an announcement, redefining the technical specifications of low plate semi-trailer. In terms of the outer size limit, the original standard of the special semi-trailer for low flat plate requires length ≤13.75m, width ≤3m, height ≤4m, and the current requirement will put the width at 3.4m; in terms of quality parameters, the original standard requires that the quality of the three-axis low flat plate is less than or equal to 10t, and the current requirement is that the three-axis is more than 42t and the five-axis is more than or equal to 55t.
Compared with other types of semitrailers, the maximum loading capacity of low plate semitrailers is 140 square meters, considerably higher than the volume of standard van semitrailers, and even equivalent to the total loading capacity of front car + rear car with middle axle.
This requires a low flat car bridge in the center of gravity is low, strong usability at the same time, but also have higher strength and bearing capacity than ordinary trailer bridge, more stable.
Taking Dairong low flat truck bridge as an example, its raw material is a high strength 20Mn2 seamless steel pipe with higher wall thickness. The difference between it and ordinary trailer bridge wall thickness can be directly seen from the section diagram below.
The higher the wall thickness, the higher the strength, the stronger the corresponding bearing performance, transportation stability and security can be further guaranteed.
In addition, is the choice of accessories, Darong low flat car bridge brake drum, brake pads, bearings, hubs, bolts, grease, etc., are heavy-duty semi-trailer dedicated to high fixed products, whether it is strength, toughness or heat capacity, wear resistance, can better meet the transport needs of low flat trailer.
4, the key technology of low flat car bridge
The production of axle usually has to go through a series of processes such as heat treatment, sandblasting, straightening, rust prevention, finishing, welding, etc. Next, let us understand the most critical processes in the production process of low flat axle.
1) One-piece heat treatment forming process
The so-called one-piece axle refers to the shaft beam and shaft head created directly from a complete steel pipe. Typically, the raw materials are heated to a certain temperature through heat treatment process and maintained to reduce hardness and improve plasticity, and then the shaft beam and shaft head are molded through the molding process, and finally the selected speed and way of cooling.
Different from the traditional "three-piece" axle, the "one-piece" heat-treated shaft head and shaft beam are connected more naturally and firmly, which can not only completely avoid welding deformation, ensure the accuracy and parameters of the shaft body, but also reduce the dead weight of the shaft body, enhance the connection strength of the shaft head and shaft beam, and completely avoid the deformation and bending of the axle under extreme strength bearing.
2) Automatic quenching and tempering
Quenching and tempering is a common process in steel treatment, through which the mechanical properties of steel can be obtained. It is a controlled heating and cooling process.
Martensitic structure can be obtained through quenching. Although it has great hardness, it is very brittle, so it is usually followed by a tempering process after quenching process. In this way, brittleness can be weakened, toughness can be improved, and the effect of hardness and toughness can be reached.
3) Shaft head fine grinding and intermediate frequency strengthening
The shaft head is the key part of connecting the wheel end parts. The higher the processing accuracy, the better the performance of the bearings, hubs and brake drums installed later. This precision of control is usually refined to each borehole or thread.
In addition, the shaft head intermediate frequency strengthening treatment is also essential, especially the bearing connection part. Only when the strength is completely guaranteed can the performance output be more stable at elevated frequency speed.