Injection molding device for shoe last forming

Abstract

This invention relates to an injection molding apparatus for shoe last forming. The main feature is that the shoe last mold is provided with at least one injection channel, and a forming space is defined between the shoe last mold and the inner wall of a receiving cavity. This allows the molding material to be directly injected into the forming space through the injection channel, thereby forming a shoe body. The shoe body covers a portion of the shoe last mold. This eliminates the conventional flow path of the molding material between the upper and lower molds, and effectively avoids problems such as flow marks and complex mold structure, thereby improving molding quality and process stability.

Claims

1. An injection molding apparatus for forming shoe lasts, comprising a bottom mold, an upper mold that can be covered on the bottom mold, and a shoe last mold disposed between the upper mold and the bottom mold; wherein, When the upper mold and the bottom mold are closed, a receiving cavity is formed by an inner wall, so that the shoe last mold can be placed in the receiving cavity. The shoe last mold has a top surface, a bottom surface opposite to the direction of the top surface, and an outer peripheral surface extending from the top surface to the bottom surface, and the diameter of the bottom surface is larger than the diameter of the top surface. The characteristic is that when the upper mold and the bottom mold are closed, the shoe last mold is received in the receiving cavity, and the bottom surface does not contact the bottom of the receiving cavity. Therefore, in the closed state, an airtight forming space is defined between the shoe last mold and the inner wall of the receiving cavity. The shoe last mold is provided with at least one injection channel for the molding material to pass through, so that the molding material can be injected into the forming space through the injection channel and formed into a shoe body in the forming space. The shoe body covers a part of the shoe last mold.

2. The injection molding apparatus for shoe last forming as described in claim 1, wherein, The injection channel extends from the top surface to the bottom surface.

3. The injection molding apparatus for shoe last forming according to claim 1 or 2, wherein, The molding material is output from an injection device, and one end of the injection channel is connected to the injection device.

4. The injection molding apparatus for shoe last forming as described in claim 1, wherein, The molding material is output from an injection device, and the upper mold is provided with at least one injection channel for the molding material to pass through, so that the molding material of the injection device flows through the injection channel of the upper mold and is then injected into the injection channel of the shoe last mold.

5. The injection molding apparatus for shoe last forming according to claim 1 or 2, wherein, The shoe last mold is mounted on a frame, and the frame is detachably mounted on the bottom mold so that the frame can be directly mounted on the bottom mold or removed from the bottom mold.

6. The injection molding apparatus for shoe last forming as described in claim 5, wherein, The frame has a base frame, a top frame disposed relative to the base frame, and at least one side frame disposed between the base frame and the top frame. When the shoe last mold is fixed to the top frame, the shoe last mold and the base frame are spaced apart.

7. The injection molding apparatus for shoe last forming according to claim 6, wherein, A shoe sole is placed on the base frame so that it can be combined with the shoe body during molding.

8. The injection molding apparatus for shoe last forming according to claim 1 or 2, wherein, The outer peripheral surface of the shoe last mold is divided into a first outer peripheral surface extending from the top surface and a second outer peripheral surface located between the first outer peripheral surface and the bottom surface. When the upper mold and the bottom mold are closed, there is a gap between the second outer peripheral surface and the inner wall.

9. The injection molding apparatus for shoe last forming as described in claim 8, wherein, When the upper mold and the bottom mold are closed, the first outer peripheral surface of the shoe last mold is in contact with the inner wall of the receiving cavity.

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