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The semi-trailer cargo part is a semi-trailer with a structure. It is mainly used in logistics systems for ships, ports, routes, highways, transfer stations, bridges, tunnels and multimodal transport.
■ Specifically for a variety of transportation. It can be used repeatedly for a long time and has sufficient strength.
■ The use of transshipment goods, can be directly loaded in the consignor's warehouse, transported to the consignee's warehouse unloading, change the car, boat in the middle, no need to take the goods out of the box.
■ Can be quickly loaded and unloaded, and can be easily and easily changed from one transport to another.
■ It is convenient for the filling and emptying of goods to meet the individual needs of customers. According to the customer's need for tooling, the quality is stable and the performance is reliable. Semi-trailers are dedicated transport trailers that are carried. In the early stage of transportation development, due to the small carrying capacity and the small amount, it was mostly carried by ordinary trucks.

Since the 1960s, with the rapid development of transportation, countries have successively developed special-purpose vehicles. The size of the loading position of the trailer is determined according to the standard size, and a fixed twist lock device is provided at a position corresponding to the four corners of the bottom. Special transport trailers carried. A fixed twist lock is provided at the four corners of the loading position. It is usually semi-mounted, fully-mounted and double-mounted, with a semi-trailer type. The semi-trailer type has a flat type and a skeleton type. The former has a flat cargo platform, and can also be used for shipping ordinary long-sized goods; the latter has no cargo platform, and is mounted on the chassis skeleton, and is fixed by the twist lock device to become the strength of the semi-trailer. member.

The semi-trailer has no fences and is widely used for medium and long-distance freight transportation. The series of semi-trailer frames are of the beam-type structure, and the longitudinal beams are of the straight live gooseneck type. The web height is from 400mm to 550mm, the longitudinal beam is welded by automatic submerged arc welding, the frame is shot peened, the beam is inserted into the stringer and welded. It consists of a series of dry plate springs and suspension bearings. It has a reasonable structure and strong rigidity and strength. It is used to support load cushioning. Semi-trailers are commonly used to transport heavy-duty vehicles (such as tractors, buses, special vehicles, etc.), rail vehicles, mining machine forestry machines, agricultural machinery (such as excavators, bulldozers, loaders, pavers, cranes, etc.) and others. For heavy goods, the lower the center of gravity, the better the stability and safety, and the stronger the ability to transport ultra-high cargo and obstacles through the head.

The semi-trailer structure and the loading semi-trailer usually adopt a concave beam type (or well type) frame, and the front part of the frame is a gooseneck (the towing pin of the front part of the gooseneck is connected with the traction saddle on the tractor, the rear end and the half of the gooseneck) The trailer frame is connected), the middle section is the cargo platform (the lowest part of the frame), and the rear end is the wheel carrier (including the wheel). When loading machinery on a semi-trailer, the mechanical equipment is usually loaded from the rear end of the semi-trailer, that is, by moving the mechanical equipment from the rear wheel frame or removing the wheels, and then fixing the mechanical equipment to the semi-trailer. The semi-trailer walking structure uses high-strength international steel material, and the whole vehicle has light weight and guarantees its resistance to twisting, shock and bounce, and meets different road carrying capacity.

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