The dump semi-trailer is suitable for the transportation of bulk and scattered goods such as coal, ore, and construction materials. Dump semi-trailers can be divided into two categories according to their use: one is heavy-duty and super-heavy-duty dump trailers for off-road transportation, which mainly undertake transportation tasks such as large-scale mines and projects, and are usually used in conjunction with excavators. The other type belongs to the light and medium-sized ordinary dump trailer for road transportation, which is mainly responsible for the transportation of loose goods such as sand, soil, coal, etc., and is usually used in conjunction with loaders.