The wheel barrow (barrow; hand truck) is a truck that is pushed and pulled by human power. It is the ancestor of all vehicles. Although trolley material handling technology continues to evolve, carts continue to be used as an indispensable handling tool. Trolley is widely used in production and life because of its low cost, simple maintenance, easy operation, and light weight. It can work in places where motor vehicles are inconvenient to use, and it is very convenient to transport lighter items at short distances.