Lowbed semi-trailer has no rails on the vehicle, and it has a wide range of uses, mainly for medium and long-distance freight transportation. The Lowbed semi-trailer frame is a through-beam structure, and the longitudinal beam adopts a straight and live gooseneck type. The height of the webs ranges from 400mm to 550mm, the longitudinal beams are welded by automatic submerged arc welding, the frame is shot blasted, and the cross beams penetrate the longitudinal beams and weld the whole. Composed of tandem dry plate spring and suspension support, the structure is reasonable, with strong rigidity and strength, used to support the load and buffer the impact.

Lowbed semi-trailer is usually used to transport heavy vehicles (such as tractors, buses, special vehicles, etc.), rail vehicles, mining machinery, forestry machinery, agricultural machinery (such as excavators, bulldozers, loaders, paving machines, cranes, etc.) And other heavy-loaded goods, the lower the center of gravity, the better the stability and safety, and the stronger the ability to transport ultra-high goods and pass overhead obstacles. Lowbed semi-trailer structure and loading low flatbed semi-trailer usually adopt concave beam type (or well type) frame, that is, the front part of the frame is a gooseneck (the traction pin of the front part of the gooseneck is connected with the traction saddle on the tractor, and the gooseneck The rear end is connected with the semi-trailer frame), the middle section is the cargo platform (the lowest part of the frame), and the rear end is the wheel frame (including wheels). When loading mechanical equipment on the Lowbed semi-trailer, the mechanical equipment is usually loaded from the rear of the semi-trailer, that is, the mechanical equipment is moved from the rear wheel frame or the wheels are removed, and then the mechanical equipment is fixed on the semi-trailer. on. Lowbed semi-trailer walking structure uses high-strength international steel material, the vehicle has a light weight, and guarantees its anti-torsion, anti-vibration, anti-bump ability, and meets different road bearing capacity.

Heavy-duty Lowbed semi-trailer is used for trailers that carry oversize and overweight cargo. The basic form of the heavy-duty Lowbed semi-trailer is a monocoque trailer. It generally has the following structure. The frame and the axles, that is, there are two left and right axles on one axis, which are also called two axle rows. Common monocoque trailers have 2 to 7 axes. One wheel axle is equipped with 4 tires, and one axis has 8 tires. So the width of the whole car can reach more than 3 meters. In order to reduce the center of gravity of the whole vehicle, a steel radial wide rim tire with a small diameter and a large load capacity is generally installed. Each tire can withstand a load of about 4 tons under low-speed operating conditions. The frame adopts a high-strength alloy steel box section welded structure. Usually a 5-axis, two-axis single Lowbed semi-trailer can carry more than 100 tons.