Assembling device and assembling method for ZnO lightning arrester of power transformer

The invention discloses an assembling device and method for a ZnO lightning arrester of a power transformer, and relates to the technical field of lightning arrester assembling. The assembling device for the ZnO lightning arrester of the power transformer comprises a base, a support and an insulating cylinder, the support is connected to the surface of the base, the insulating cylinder is installed on the support, a gap is formed in the surface of the insulating cylinder, a gap expanding assembly is connected to the middle of the gap and connected to the support, the gap expanding assembly comprises a gap expanding plate and a sliding block, and the sliding block is connected to the gap expanding plate. The two groups of seam expanding plates are arranged, the two ends of the two groups of seam expanding plates are expanded outwards, and the two groups of seam expanding plates are tightly attached to the inner walls of the two sides of a gap respectively; according to the assembling device for the ZnO lightni