Abstract: This disclosure relates to a frame and a frame thereof. The frame comprises a frame body, wherein the frame further comprises an assistant unloading device disposed on the frame body, the assistant unloading device comprises an air bag, a mounting plate, and at least a set of guides; the air bag is fixed to the mounting plate, the guides comprises a guiding tube and a guiding rod, the guiding tube is vertically disposed on the frame body, the guiding rod is inserted into the guiding tube and connected to the mounting plate, and by inflating the air bag, the guiding rod is moved to vertically rise along the guiding tube to perform assistant unloading, thereby the trailer and frame of the disclosure have not only a simple structure, a light mass, and a lower cost, but also an excellent lifting capability and a stable lifting process.

Abstract: This disclosure relates to a frame and a frame thereof. The frame comprises a frame body, wherein the frame further comprises an assistant unloading device disposed on the frame body, the assistant unloading device comprises an air bag, a mounting plate, and at least a set of guides; the air bag is fixed to the mounting plate, the guides comprises a guiding tube and a guiding rod, the guiding tube is vertically disposed on the frame body, the guiding rod is inserted into the guiding tube and connected to the mounting plate, and by inflating the air bag, the guiding rod is moved to vertically rise along the guiding tube to perform assistant unloading, thereby the trailer and frame of the disclosure have not only a simple structure, a light mass, and a lower cost, but also an excellent lifting capability and a stable lifting process.

Abstract: A main beam of a container semi-trailer provided with the joint, and the connecting method thereof. The joint is used to connect a main beam and has a first connecting plate connected to the main beam; a second and a third connecting plate secured to the same side of the first connecting plate and spaced apart to each other; and a fourth connecting plate slantingly connected between the second and third connecting plates.

Abstract: A joint and a main beam of a container semi-trailer provided with the joint. The joint includes a first connecting plate disposed on a connecting end of a first main beam of the container semi-trailer, wherein at least one side of the first connecting plate extends outwardly and forms a first extension, first connecting holes are disposed on the first connecting plate and the first extension; a second connecting plate is disposed on the connecting end of a second main beam of the container semi-trailer, wherein at least one side extends outwardly and forms a second extension, second connecting holes corresponding to the first connecting holes are disposed on the second connecting plate and the second extension; and fasteners are inserted into the first and second connecting holes and fastened to connect the connecting ends of the two main beams to form a complete main beam.

Abstract: A locking device of extendable and retractable container semi-trailers comprises four link bars, two lock pin assemblies, a crossmember, a falling tube and a pull assembly. Two ends of the pull assembly are connected with two link bars and one lock pin assembly respectively. Said pull assembly comprises an automatic locking and releasing device fixed rotatablely between a bottom plate and a top plate of said crossmember. The pull assembly is rotated round the automatic locking and releasing device to a locking place, and the automatic locking and releasing device locks said pull assembly. The falling tube acts on the automatic locking and releasing device, and the pull assembly is released.

Abstract: A main beam of a container semi-trailer provided with the joint, and the connecting method thereof. The joint is used to connect a main beam and has a first connecting plate connected to the main beam; a second and a third connecting plate secured to the same side of the first connecting plate and spaced apart to each other; and a fourth connecting plate slantingly connected between the second and third connecting plates.

Abstract: A joint and a main beam of a container semi-trailer provided with the joint. The joint includes a first connecting plate disposed on a connecting end of a first main beam of the container semi-trailer, wherein at least one side of the first connecting plate extends outwardly and forms a first extension, first connecting holes are disposed on the first connecting plate and the first extension; a second connecting plate is disposed on the connecting end of a second main beam of the container semi-trailer, wherein at least one side extends outwardly and forms a second extension, second connecting holes corresponding to the first connecting holes are disposed on the second connecting plate and the second extension; and fasteners are inserted into the first and second connecting holes and fastened to connect the connecting ends of the two main beams to form a complete main beam.

Abstract: A locking device of extendable and retractable container semi-trailers comprises four link bars, two lock pin assemblies, a crossmember, a falling tube and a pull assembly. Two ends of the pull assembly are connected with two link bars and one lock pin assembly respectively. Said pull assembly comprises an automatic locking and releasing device fixed rotatablely between a bottom plate and a top plate of said crossmember. The pull assembly is rotated round the automatic locking and releasing device to a locking place, and the automatic locking and releasing device locks said pull assembly. The falling tube acts on the automatic locking and releasing device, and the pull assembly is released.