Sliding mechanism of lining trolley

The utility model provides a sliding mechanism of a lining trolley, the lining trolley comprises a trolley main body and a four-corner gantry, the trolley main body is arranged on the four-corner gantry, the four-corner gantry is provided with four supporting columns, a longitudinal beam is erected at the bottom of every two supporting columns parallel to the axial direction, the axial direction is the advancing direction of the lining trolley, and two supporting mechanisms are arranged below each longitudinal beam. A connecting seat is arranged at the bottom of each longitudinal beam, a sliding mechanism is arranged at the bottom of each longitudinal beam in the axial direction, and each sliding mechanism comprises two supporting seats which are connected with the longitudinal beams in a sliding mode and can slide relative to the longitudinal beams in a reciprocating mode in the axial direction; the connecting beam is provided with an empty groove, a connecting mechanism is arranged in the empty groove, and