Low-bed semi-trailers have no sideboards on the load side and are widely used, primarily for medium- and long-distance freight transport. The series of semi-trailers features a through-beam structure with straight, flexible gooseneck longitudinal beams. Web height ranges from 400mm to 550mm. The longitudinal beams are welded using automatic submerged arc welding, and the frame undergoes shot peening. Crossbeams are inserted into the longitudinal beams and welded together as a whole. The suspension system consists of tandem leaf springs and suspension supports, resulting in a rational structure with high rigidity and strength, used to support loads and absorb impacts.
Low-bed semi-trailers are typically used to transport heavy vehicles (such as tractors, buses, and special-purpose vehicles), rail vehicles, mining and forestry machinery, agricultural machinery (such as excavators, bulldozers, loaders, pavers, and cranes), and other heavy-duty goods. The lower the center of gravity, the better the stability and safety, and the greater the ability to transport oversized cargo and navigate overhead obstacles.
Low-bed semi-trailer structure and loading: Low-bed semi-trailers typically use a concave beam (or well-type) frame, where the front section is a gooseneck (the front of the gooseneck connects to the towing saddle on the tractor unit, and the rear end connects to the semi-trailer frame), the middle section is the cargo platform (the lowest part of the frame), and the rear section is the wheel frame (including wheels).
When loading machinery onto a low-bed semi-trailer, it is usually loaded from the rear, either by moving the machinery from the rear wheel frame or by removing the wheels, and then securing the machinery to the semi-trailer. The running gear of low-bed semi-trailers uses high-strength international steel, resulting in a lightweight vehicle while ensuring resistance to torsion, shock, and bumps, meeting the load-bearing requirements of different road surfaces.
