Rear-mounted onboard temporary supporting device for heading machine

The invention discloses a rear-mounted onboard temporary supporting device for a heading machine, relates to the technical field of temporary supporting devices, and aims at solving the technical problems that in the prior art, the connecting position of the rear-mounted onboard temporary supporting device and the heading machine is prone to breakage, the supporting area is small, and the rear-mounted onboard temporary supporting device does not have the rotary telescopic function. The temporary supporting device comprises a large arm, a first telescopic air cylinder installed on the inner side of the left end of the large arm, a middle arm installed in the large arm and connected with the telescopic end of the first telescopic air cylinder, a second telescopic air cylinder installed on the inner side of the left end of the middle arm, and a small arm installed in the middle arm and connected with the telescopic end of the second telescopic air cylinder. The temporary supporting device is installed and fixed