Device for molding gate valve casting lower die

The invention discloses a device for molding a gate valve casting lower die and relates to the technical field of casting. The device comprises a placement base body composed of a frame structure, a sand filling groove is formed in the upper end face of the placement base body, and positioning pins are arranged at the four corners of the upper end face of the placement base body; an adjustment boxis fixed to the interior of the placement base body, a slide groove is formed in the outer wall, close to the inner side, of the adjustment box, and a screw is arranged in the adjustment box; the twoends of the screw are rotatably connected with the inner wall of the adjustment box respectively, a nut is further in threaded connection with the screw, and a supporting block is fixed to the nut; the upper and lower ends of a first opening are provided with a first fixing base, the upper and lower ends of a second opening are provided with a second fixing base, a first worm wheel and a second worm wheel are rotatably co