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A single-cross translational wagon having a tow bar assembly, a single-cross folding assembly, a bottom frame folding assembly, front wheel assemblies and rear wheel assemblies. The tow bar assembly is arranged in front of the single-cross folding assembly. The bottom frame folding assembly is arran

A single-cross translational wagon having a tow bar assembly, a single-cross folding assembly, a bottom frame folding assembly, front wheel assemblies and rear wheel assemblies. The tow bar assembly is arranged in front of the single-cross folding assembly. The bottom frame folding assembly is arranged below the single-cross folding assembly. The single-cross folding assembly has a cross inner frame, a cross outer frame, a front wheel supporting tube and a rear wheel supporting tube. The cross inner frame includes an upper cross inner frame part (is in a backward U shape) and first lower cross tubes. The rear ends of the left and right sides of the upper cross inner frame part include the two first lower cross tubes front ends are hinged with the front ends of the first lower cross tubes and the rear ends are hinged with the lower end of the rear wheel supporting tube.

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1. A single-cross translational wagon comprising: a tow bar assembly;a single-cross folding assembly;a bottom frame folding assembly;front wheel assemblies; andrear wheel assemblies,wherein the tow bar assembly is positioned in front of the single-cross folding assembly, and the bottom frame folding

1. A single-cross translational wagon comprising: a tow bar assembly;a single-cross folding assembly;a bottom frame folding assembly;front wheel assemblies; andrear wheel assemblies,wherein the tow bar assembly is positioned in front of the single-cross folding assembly, and the bottom frame folding assembly is arranged below the single-cross folding assembly; andwherein the single-cross folding assembly comprises a cross inner frame, a cross outer frame, a front wheel supporting tube and a rear wheel supporting tube;wherein the bottom frame folding assembly comprises a front bottom frame assembly and a rear bottom frame assembly;wherein the front bottom frame assembly comprises two bottom frame front longitudinal tubes, and the two bottom frame front longitudinal tubes are arranged symmetrically left and right and narrowed inwards from front to back; andwherein the rear bottom frame assembly comprises two bottom frame rear longitudinal tubes, and the two bottom frame rear longitudinal tubes are arranged symmetrically left and right and narrowed inwards from front to back. 2. The wagon of claim 1, wherein the cross inner frame includes an upper cross inner frame part and first lower cross tubes;wherein the upper cross inner frame part is in a U shape which is open backwards, the rear ends of the left and right sides of the upper cross inner frame part are provided with the two first lower cross tubes respectively; andwherein hinged with the front ends of the first lower cross tubes, and the rear ends of the first lower cross tubes are hinged with the lower end of the rear wheel supporting tube. 3. The wagon of claim 2, wherein the cross outer frame comprises an upper cross outer frame part and second lower cross tubes, the upper cross outer frame part is in a U shape which is open forwards. 4. The wagon of claim 3, wherein the front ends of the left and right sides of the upper cross outer frame part are provided with the two second lower cross tubes respectively and hinged with the rear ends of the second lower cross tubes. 5. The wagon of claim 4, wherein the front ends of the second lower cross tubes are hinged with the lower end of the front wheel supporting tube, and the second lower cross tubes are located on the outer sides of the first lower cross tubes and hinged with the first lower cross tubes in an X shape. 6. The wagon of claim 5, wherein the left and right sides of the front end of the upper cross inner frame part are hinged with the upper end of the front wheel supporting tube respectively, andwherein the front wheel assemblies are mounted at the bottom of the front wheel supporting tube, the left and right sides of the rear end of the upper cross outer frame part are hinged with the upper end of the rear wheel supporting tube respectively, and the rear wheel assemblies are mounted at the bottom of the rear wheel supporting tube. 7. The wagon of claim 1, wherein the front bottom frame assembly and the rear bottom frame assembly are symmetrical front and back and can be turned downwards by 90 degrees to be hinged together. 8. The wagon of claim 1, further comprising front longitudinal tube grooved components, which are open downwards, are arranged at the rear ends of the two bottom frame front longitudinal tubes respectively, rear longitudinal tube axle sleeves are arranged at the front ends of the two bottom frame rear longitudinal tubes respectively. 9. The wagon of claim 8, wherein the front ends of the two bottom frame rear longitudinal tubes are inserted into grooves of the front longitudinal tube grooved components of the two bottom frame front longitudinal tubes respectively, and meanwhile, the rear longitudinal tube axle sleeves are hinged into round holes in the front longitudinal tube grooved components through rivets respectively. 10. The wagon of claim 9, wherein the front ends of the two bottom frame front longitudinal tubes are hinged with the front wheel supporting tube respectively, and the rear ends of the two bottom frame rear longitudinal tubes are hinged with the rear wheel supporting tube respectively. 11. The wagon of claim 10, wherein long bottom frame crossbeams and short bottom frame crossbeams are arranged between the two bottom frame front longitudinal tubes and between the two bottom frame rear longitudinal tubes respectively, and the short bottom frame crossbeams are arranged on the corresponding narrowed sections. 12. The wagon of claim 11, wherein the upper cross inner frame part and the upper cross outer frame part are arranged symmetrically front and back, and the left and right sides of the upper cross inner frame part and the left and right sides of the upper cross outer frame part are all arranged horizontally. 13. The wagon of claim 12, wherein the front wheel supporting tube and the rear wheel supporting tube are each in a U shape which is open upwards. 14. The wagon of claim 13, wherein a.) first hinge bases are mounted at the rear ends of the left and right sides of the upper cross inner frame part respectively;b.) second hinge bases are mounted at the front ends of the first lower cross tubes, and the second hinge bases are hinged with the first hinge bases through rivets;c.) third hinge bases are mounted at the front ends of the left and right sides of the upper cross outer frame part respectively; andd.) fourth hinge bases are mounted at the rear ends of the second lower cross tubes, and the fourth hinges are hinged with the third hinge bases through rivets. 15. The wagon of claim 14, wherein the tow bar assembly is a steel ball tow bar assembly; and each front wheel assembly includes a front wheel, a front wheel carrier and a front wheel axle;wherein the front wheel is mounted on the front wheel carrier, the lower end of the front wheel axle is welded to the front wheel carrier, the upper end of the front wheel axle penetrates through the bottom of the front wheel supporting tube from bottom to top to be connected with a nut in a screwed mode, andwherein gaskets are arranged between the nut and the front wheel supporting tube, as well as between the front wheel supporting tube and the front wheel axle. 16. The wagon of claim 15, wherein each rear wheel assembly comprises a rear wheel, a rear wheel carrier, a rear wheel axle and a rear wheel axle fixing piece;wherein the rear wheel is mounted on the rear wheel carrier, the lower end of the rear wheel axle is welded to the rear wheel carrier;wherein the upper end of the rear wheel axle penetrates through the bottom of the rear wheel carrier fixing piece from bottom to top to be connected with a nut in a screwed mode, andwherein the lower end of the rear supporting tube is hinged with the rear wheel carrier fixing piece. 17. The wagon of claim 16, wherein each front wheel assembly includes a front wheel, a front wheel carrier, a front wheel axle and a detachable front wheel structure; andwherein the front wheel is mounted on the front wheel carrier, the lower end of the front wheel axle is welded to the front wheel carrier, an annular groove is formed in the upper end of the front wheel axle, and the detachable front wheel structure comprises a front wheel axle sleeve, a front wheel plastic bushing, a front wheel steel wire clamp and a front wheel clamp holder. 18. The wagon of claim 17, wherein the front wheel plastic bushing is inlaid in the front wheel axle sleeve, the side wall of the front wheel axle sleeve is welded to the front wheel supporting tube, and the front wheel steel wire clamp is in a U shape with the two side edges in concave V shapes and is mounted on the front wheel clamp holder in an openable mode. 19. The wagon of claim 18, wherein the front wheel clamp holder comprises an upper portion and a lower portion, a guide post matched with the front wheel steel wire clamp is arranged in the space between the upper portion and the lower portion of the front wheel clamp holder, which is used for mounting the front wheel steel wire clamp; andwherein the upper portion and the lower portion of the front wheel clamp holder are connected through the guide post, and center round holes are further formed in the bottoms of the upper portion and the lower portion of the front wheel clamp holder and communicate with the space used for mounting the front wheel steel wire clamp. 20. The wagon of claim 19, wherein the upper end of the front wheel axle sequentially penetrates through the front wheel plastic bushing and the front wheel steel wire clamp from bottom to top to be matched with the center round holes in the front wheel clamp holder, and meanwhile, the front wheel steel wire clamp is clamped in the annular groove in the front wheel axle; andwherein each rear wheel assembly comprises a rear wheel, a rear wheel carrier, a rear wheel axle and a detachable rear wheel structure, wherein the rear wheel is mounted on the rear wheel carrier, the lower end of the rear wheel axle is welded to the rear wheel carrier, an annular groove is formed in the upper end of the rear wheel axle, and the detachable rear wheel structure includes a rear wheel axle sleeve, a rear wheel plastic bushing, a rear wheel steel wire clamp and a rear wheel clamp holder; andwherein the rear wheel plastic bushing is inlaid in the rear wheel axle sleeve. 21. The wagon of claim 19, wherein the rear wheel steel wire clamp is in a U shape with the two side edge in concave V shapes and is mounted on the rear wheel clamp holder in an openable mode, the rear wheel clamp holder comprises an upper portion and a lower portion, a guide post matched with the rear wheel steel wire clamp is arranged in the space between the upper portion and the lower portion of the rear wheel clamp holder, which is used for mounting the rear wheel steel wire clamp. 22. The wagon of claim 21, wherein the upper portion and the lower portion of the rear wheel clamp holder are connected through the guide post, and center round holes are further formed in the bottoms of the upper portion and the lower portion of the rear wheel clamp holder and communicate with the space used for mounting the rear wheel steel wire clamp; andwherein the upper end of the rear wheel axle sequentially penetrates through the bottom of the rear wheel supporting tube, the rear wheel plastic bushing and the rear wheel steel wire clamp from bottom to top to be matched with the center round holes in the rear wheel clamp holder, and meanwhile, the rear wheel steel wire clamp is clamped in the annular groove in the rear wheel axle.