The semi-trailer frame is mainly composed of main beams, support beams, connecting beams, side beams, locking mechanisms, kingpin connection device, and panels. The side beams are mostly made of channel steel or bent sections, and the support beams commonly use W-beams, with 10# or larger channel steel used for heavy loads.
The semi-trailer frame adopts a double-layer steel pipe structure design. The upper layer is the load-bearing surface (usually covered with 5-8mm checkered steel plate), and the lower layer is the support frame. The main beams use 16Mn high-strength steel (section height 300-400mm), with a beam spacing of 800-1200mm, fixed to the longitudinal beams with U-bolts. The side beams are formed by bending 8# channel steel, and the kingpin base plate has a thickness of 50mm. The entire structure undergoes shot blasting and electrophoretic anti-corrosion treatment. We offer various frame customization options, including reinforced type (main beam wall thickness 8mm) and lightweight type (using high-strength steel to reduce weight by 15%), to meet different load requirements.
