Starved injection mold is prevented to switch upper cover

The utility model relates to a starved injection mold is prevented to switch upper cover, including setting up the bush backing plate in roof one side, set up the cover half bottom plate in bush backing plate one side, set up the cover half that sets up the middle part at the cover half bottom plate, set up movable mould, ejecting bottom plate and mould foot at the movable mould bottom plate middle part, said movable mould bottom plate with said mould foot passes through connecting rod fixed connection and form the activity space between the two, and ejecting bottom plate is located in the activity space and with movable mould bottom plate elasticity sliding connection, the cover half bottom plate with movable mould bottom plate is relative to the cover half is relative with the movable mould, form the space of moulding plastics between cover half and the movable mould, the central authorities of bush backing plate run through is provided with the bush that has the sprue, be connected with a plurality of ejector pins on the ejecting bottom plate, the tip of ejector pin is located the mould plastics edge in space. The utility model discloses a zhi liudao advances glue to the space multiple spot of moulding plastics simultaneously, has avoided the phenomenon of the local starved of product to take place, has guaranteed the steady quality of product