With the advantages of strong specialization, large loading capacity, fast transportation, convenient disassembly, wide application and low investment cost, the heavy duty highwall semi-trailer has been rapidly developed and widely used due to social and economic factors such as energy saving and environmental protection. They have become one of the main vehicles for road transport. Meanwhile, with the development of science and technology and the progress of society, the highwall semi-trailer is facing the challenges of technological upgrading and other transportation methods in the market.
The Development of Heavy Duty Highwall Semi Trailer Bangladesh
The rapid development of heavy duty highwall semi-trailer Bangladesh began at the beginning of this century, especially around 2008. Under the strengthening of national governance, the demand for lightweight vehicles in the transportation market is more urgent. At the same time, the national testing agency further clarified the testing standards for van semi-trailers: "the top is closed and cannot be opened" and "more than two side-to-side doors are not allowed", and the advantages of van semi-trailers are easy to use. The highwall semi-trailer is 2t to 3t lighter than the van semi-trailer. Therefore, van semi-trailers have gradually been replaced in some fields such as coal transportation, agricultural and sideline products, and other light foam cargo transportation. Heavy duty highwall semi-trailer have developed rapidly due to their flexibility and well-rounded functions. Especially with the rise of many special goods such as less-than-truckload goods and express delivery, the number of goods transported by highwall semi-trailers has continued to grow.
Technical Status of Heavy Duty Highwall Semi Trailer Bangladesh
After nearly 10 years of rapid development, the type and structure of the heavy duty highwall semi-trailer Bangladesh have gradually improved. In order to adapt to different cargo transportation, the side wall of the highwall semi-trailer has evolved from a single door opening method to a variety of door opening methods such as long lock lever opposite door, short lock lever opposite door, left and right open, up and down opening, double-layer, single-layer, and other highwall semi-trailers. The shape of the trailer can be straight beam type, gooseneck type, and so on. In particular, the popularization and application of high-strength steel for automobiles has greatly reduced the curb weight of the unloaded semi-trailer. Under normal circumstances, the dead weight of the 13-meter unloaded semi-trailer is 6-6.5 t. It is obviously better than the van semi-trailer. Under the condition of a certain total mass, the reduction of self-weight means the increase of loaded goods.
Structure of Heavy Duty Highwall Semi Trailer Bangladesh
In terms of appearance and structure, heavy duty highwall semi-trailers Bangladesh generally have two types: straight beam type and gooseneck type. The height difference between the bottom plate and the gooseneck of the high and low plates is generally about 200mm. Compared with the straight beam structure, the loading space is larger and the cargo center of gravity is lower. In the standard transportation, the gooseneck part has little difference in the selection of the bearing capacity from the straight beam through the structural design. At present, straight beams are mostly used for bulk cargo transportation such as coal, grain, sand and gravel, etc. Loading and unloading is relatively convenient. In terms of price, the production process of goosenecks is relatively more than that of straight beams. Generally, the price of the same configuration is about a couple of thousand RMB more expensive.
Difference among Different Door Opening Methods
In terms of door opening, in order to adapt to different cargo transportation, as mentioned earlier the side wall of the heavy duty highwall semi-trailer has evolved from a single door opening method to a variety of door opening methods.
The locking rod structure is generally used in the transportation of bulk cargo such as coal. The main advantage is that the loading and unloading is convenient, but the weight is relatively heavy. The long-lock bar highwall semi-trailer was developed on the basis of the early coal transport van semi-trailer. At that time, the side of the coal transport van semi-trailer was fully opened and had a long lock bar structure. The technical requirements of trailers have changed, the weight of the van is relatively large, and the top of the heavy duty highwall semi-trailer Bangladesh is open, which is convenient for loading with mechanical equipment. When the side doors are fully opened, the size of the door opening is relatively large, which can meet the unloading of construction machinery such as forklifts.
Generally, when the length of the long lock rod semi-trailer is more than 11m, there are 3 pairs of doors on each side. Compared with the long lock rod, the short lock rod highwall semi-trailer has no top side wall and the lock rod is shorter, and the weight is relatively lighter. Canvas can also be nailed on the inside of the side wall, but because there is no upper edge, the anti-swelling ability is poorer than that of the long lock rod structure. In terms of size, the length of the short lock bar semi-trailer is generally 13m and the height from the bottom plate to the top of the fence is generally no higher than 1800mm. This heavy duty highwall semi trailer Bangladesh can carry out long-distance logistics and general cargo transportation in addition to coal, sand and gravel materials.