Onboard all-dimensional temporary support of heading machine

The onboard all-dimensional temporary support of the heading machine comprises a gantry support, a head-on support and a displacement driving mechanism which are arranged on the heading machine, and the displacement driving mechanism is used for driving the gantry support and the head-on support to stretch forwards and move backwards. The device is characterized in that the displacement driving mechanism is composed of two guide rails, a sliding base, a rotating base, a telescopic arm, a supporting base, a rotating oil cylinder and a sliding base oil cylinder, the sliding base is arranged on the two guide rails in a sliding mode, a cylinder body of the sliding base oil cylinder is hinged to the heading machine, the rear end of the rotating base is hinged to the sliding base, and the cylinder body of the rotating oil cylinder and a telescopic rod are hinged to the front end of the sliding base and the front end of the rotating base respectively; the rear end of the telescopic arm is arranged on the rotating se