Underground fire blast robot based on expansion and contraction of planetary roller lead screw and traction method

The invention relates to the technical field of development of underground resources such as petroleum, natural gas and terrestrial heat, in particular to an underground combustion and explosion robot based on expansion and contraction of a planetary roller lead screw and a traction method. The invention provides an underground fire blast robot based on expansion and contraction of a planetary roller screw and a traction method. The underground fire blast robot comprises a rear joint, a rear main body, an expansion short joint and a front main body, wherein a rear control short joint and a rear support short joint are arranged on the front joint and the rear main body; the front main body is provided with a front supporting short section and a front control short section, and the telescopic short section is connected with the rear supporting short section and the front control short section respectively. The method has the advantages of being reliable and stable, the influence on a pipe string is small, and t