Bin grid semi-trailer refers to the semi-trailer with fence structure installed on the cargo part. It is generally used for the transportation of agricultural and sideline products and other light bubble goods. It is also one of the commonly used transportation tools of consignment stations and express companies. In order to adapt to the transportation of different goods, in recent years, the type and structure of warehouse grid semi-trailer are also constantly improving, and it is even called "Wanjin oil" by people in the industry, which shows the universality of its application range.

So, at present, the domestic warehouse grid semi-trailer can be divided into several categories?

1. Single layer and double layer.

These two kinds of semi-trailer are relatively common, and they are also the earliest structure of the grate. The height from the bottom plate of the single-layer bin to the top of the bin is generally less than 1800mm, and the height of the double-layer bin is more than 1800mm.

These two semi trailers are mainly used for long-distance transportation, and the types of goods loaded are mainly agricultural and sideline products, steel, light bubble goods with large volume, etc.

2. Long lock rod and short lock rod.

The long lock bar bin grid semi-trailer is developed on the basis of the early coal transportation van semi-trailer. Its top is open for loading; The surrounding area is closed with canvas, which is similar to the van in function. Generally, when the body length is more than 11m, 3 pairs of opposite doors are designed on each side; When the body length is less than 11m, two pairs of doors are designed on each side. When the side door is fully opened, its size can meet the loading and unloading requirements of construction machinery. The goods transported by this model are mainly coal, sandstone and other goods.

Compared with the long lock bar, the short lock bar semi-trailer has no side wall at the top, the lock bar is short, and the height from its bottom plate to the top of the bin grid is generally no more than 1800mm. Because there is no upper wall, the anti rise ability of the warehouse grid is poor. In addition to transporting coal, sand and gravel, this warehouse grid semi-trailer can also carry out long-distance logistics transportation.

3. Straight beam type and gooseneck type.

Straight beam is commonly known as "straight plate". At present, it is mostly used for the transportation of bulk goods, such as coal, grain, sand and stone, which is relatively convenient for loading and unloading.

Gooseneck girder is commonly known as "high and low plate". The height difference between its bottom plate and gooseneck is generally about 200mm. Compared with the straight beam structure, it has larger loading space and lower cargo center of gravity. It is suitable for general cargo transportation with relatively low density and coal transportation in mountainous areas with large road curvature. The production process of high and low plate warehouse grid car is more complex than that of straight plate warehouse grid car. Generally, the price of the same configuration is about 1000-2000 yuan.

In recent ten years, the warehouse grid semi-trailer has achieved rapid development in China, which is mainly due to its advantages of strong specialization, large loading capacity, fast transportation, convenient disassembly, wide use and low investment cost.

Especially with the strengthening of overload control, lightweight models are more and more popular with car owners. Compared with van semi-trailer, the curb weight of warehouse grid semi-trailer can be 2T-3T lighter, and the dead weight of standard 13m warehouse grid is about 6t-6.5t. It has obvious advantages in energy conservation and environmental protection, so it is also gradually replacing van semi-trailer.

In addition, in terms of the types of goods to be transported, in addition to light bubble goods such as vegetables, fruits, clothes, electrical appliances and steel, coal, gravel and small engineering equipment can be transported by warehouse grid semi-trailer, which also plays a very important role in the fields of power engineering and Communication Engineering.

However, with the continuous tightening of relevant laws and regulations, the development challenges faced by warehouse grid semi-trailer are also increasing. At present, it can be divided into the following points:

1. The types of goods transported are limited.

According to the provisions of GB 1589-2016 outer contour dimensions, axle load and mass limits of road vehicles, the top of the warehouse grid semi-trailer "is equipped with a non removable top grid rod fixed with the side fence", which makes the disassembly and assembly of the warehouse grid less convenient than before to a certain extent.

In addition, according to the technical requirements of the industry, it is not allowed to have pull braces inside the warehouse grid semi-trailer. Due to the large height dimension from the bottom plate of the compartment to the top of the compartment grid, the overall strength of the compartment is weak. If there is no tension and swing inside the compartment grid semi-trailer, there will be serious box rise when loading goods, resulting in bending and deformation of the compartment grid and column. Therefore, goods that are easy to rise, such as bulk grain, coal, sand and gravel, cannot be transported.

2. The increase of car purchase cost may reach more than 50%.

For a long time, the technical content of warehouse grid semi-trailer is relatively low and the manufacturing is relatively simple, so its price is also at the lower middle level in the industry.

After the introduction of gb7258-2017 national standard for motor vehicle operation safety technical conditions, new requirements have been put forward for the warehouse grid semi-trailer from the aspects of structure, safety and technology, such as the installation of air suspension, disc brake, automatic adjusting arm, anti splash device, etc., which directly leads to the increase of vehicle purchase cost to a certain extent, and the increase can even reach more than 50%.

3. Some markets have been replaced by other forms of transportation.

With the progress of society, people's requirements for logistics transportation are also increasing, and the phenomenon of "special vehicle for special use" is becoming more and more common. For example, in the express transportation market, in addition to adding van semi-trailer with larger volume and higher safety, high-speed rail transportation mode has also been added; Another example is coal transportation. The transportation mode based on highway has been changed into multimodal transportation modes such as railway and waterway.

In addition, the emergence of new models has also had a certain adverse impact on the development of warehouse grid semi-trailer. For example, soft curtain trailer and side curtain vehicle are close to the use scene of warehouse grid semi-trailer. However, due to subtle differences in size and structure, many goods cannot be transported. Whether they can become an alternative model of warehouse grid semi-trailer still needs to be verified by the market.

From another point of view, the warehouse grid semi-trailer after the technical upgrading will gradually move towards standardization, which will help to monitor the quality of products, improve the industry threshold, and further broaden the scope of goods. Darong heavy industry group is an enterprise specializing in the production of trailer axles. Up to now, it has accumulated 20 years of industry experience, and its quality and reputation have been widely recognized by the market. Darong's disc axle, drum axle and other types are rich and complete, which can meet the different use needs of car owners. It is specially tailored for heavy-duty trailers. It is a typical representative of cost-effective axles in China.