Structure design of smooth wheel roller with variable linear load, which is new and special, is introduced, the changing characteristics and practical use of the roller are discussed.

The design basis of the springs and hydraulic system is proposed, which can better distribute the load of the rubber wheel and steering wheel, and attain the purpose of safety and reliability.

Goods fork sharp fork and wheel toper installation bracket design year, can protect year ship and drive wheel, it is apter to load and unload the tray too;