Dry-type expansion process and expansion equipment for heat-shrinkable tube

The invention discloses a heat shrink tube dry-type expansion process and expansion equipment, and relates to the technical field of heat shrink tube expansion. The expansion process comprises the following steps that a heat shrink tube is reversely rolled on a transition disc, and rolling is carried out while inflation is carried out; the heat shrink tube is driven by the upper action roller double-layer module to continuously move downwards to enter the heating cylinder; the heat shrink tube and the heating cylinder are dynamically sealed, and air pressure in the heating cylinder is balanced; the heat shrink tube enters an expansion mold after being heated, and external pressure of the heat shrink tube is released for expansion of the heat shrink tube; cooling and shaping the heat shrink tube in a cooling cylinder; and the heat shrink tube is flattened and pulled through the lower action roller single-layer module. The expansion equipment comprises a transition disc, a guide wheel, an upper action roller do