The utility model breaks traditional concept and designs the trolley support body into hollow structure and provides through hole or blind hole on the master support body and the auxiliary support body, which reduces 50 percent of the weight of the trolley, reduces the inertia of the trolley, radiates fast, reduces the wearing and the load of the bearing. The utility model can protect the bearing effectively and reduce the work load of maintenance and is easy to install, transport and disassemble. The utility model can also reduce spot danger, reduce the wearing of tyre and can prolong the service life of the tyre substantially.

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