Long-rail trolley assembly

The utility model discloses a long-rail trolley assembly which comprises a trolley body made of aluminum profile of an integrated structure, first walking mechanisms are arranged at the two ends of the trolley body respectively, a second walking mechanism is further arranged on the trolley body, and the second walking mechanism comprises two sets of lower walking wheels and a set of upper walking wheels. The upper walking wheel set is located between the two sets of lower walking wheels. Or the second walking mechanism comprises a group of lower walking wheels and two groups of upper walking wheels, and the lower walking wheel group is positioned between the two groups of upper walking wheels; the tops of the upper walking wheels are higher than the lower walking wheels, and 2n (n is larger than or equal to 1) upper walking wheels are arranged on the two sides of the trolley body in a one-to-one correspondence mode. And 2n (n is greater than or equal to 1) lower travelling wheels in each group are respectivel