Plunger pump cylinder body structure and assembling method thereof

The invention discloses a plunger pump cylinder body structure and an assembling method thereof. The assembling method comprises the following specific steps of S1, designing and processing a steel substrate, and forming a groove in the inner wall of a plunger hole; S2, designing and processing a plunger bushing according to the steel substrate; S3, conducting cold-state press fitting: pressing the plunger bushing which is placed in liquid nitrogen and cooled and shrunk into a plunger hole of the normal-temperature steel substrate, and enabling the plunger bushing to be in interference fit with the interior of the plunger hole after being heated; and S4, extruding and embedding: applying an external force for extruding the inner wall of the plunger bushing outwards to the inner wall of the plunger bushing, so that a bulge embedded in a groove is formed on the outer wall of the plunger bushing. According to the plunger pump cylinder body structure and the assembling method thereof provided by the invention, th