Inverted model structure of marine adjustable pitch propeller oil cylinder

The invention relates to the technical field of propeller accessory manufacture, in particular to an inverted model structure of a marine adjustable pitch propeller oil cylinder. The structure comprises a sand box, a riser, a I# core, an II# core, chilling blocks and a casting system, wherein the II# core is an oil cylinder liner core, is inverted in the middle of the sand box and forms an oil cylinder type cavity with an inner box of the sand box; the riser is placed in the sand box, the upper end surface of the riser is flush with the upper surface of the sand box, and the riser is located at the upper part of the oil cylinder type cavity; the I# core is placed in the middle of the riser and located at the upper part of the oil cylinder type cavity; a plurality of chilling blocks are arranged in the sand box the on the outer ring of the II# core; and the casing system is communicated with the bottom edge of an oil cylinder flange of the oil cylinder type cavity. The chilling blocks surround the outer edge o