Foaming mold device, method for preparing foaming molded body by using foaming mold device and foaming molded body

Abstract

A foaming mold device comprises an upper mold unit, a lower mold unit and a vacuumizing unit. The upper die unit is provided with a die core and an air hole; the lower mold unit and the upper mold unit are oppositely arranged, a mold cavity corresponding to the mold core is formed in the inner side of the lower mold unit and used for being filled with a macromolecule foaming raw material, when the upper mold unit and the lower mold unit are closed, the mold core and the mold cavity are closed to form a mold chamber space, and the air hole of the upper mold unit is communicated with the mold chamber space; the vacuumizing unit is connected with the air holes of the upper mold unit and vacuumizes the mold chamber space, so that the macromolecule foaming raw materials are subjected to vacuum foaming in the mold chamber space, and the method for preparing the foaming forming body is used in cooperation with the foaming mold device so as to obtain the high-quality foaming forming body. Through the design of the foaming mold device, the technical effects of reducing the loss and saving the shoe process cost are achieved.

Description

Technical Field

[0001] The invention relates to a foaming mold design, and in particular to a foaming mold device and a method for preparing a foaming molded body and the foaming molded body. Background Art

[0002] At present, in the process of manufacturing foamed molded bodies, the foaming raw materials are firstly mixed and granulated to obtain foaming masterbatches, wherein the foaming masterbatches are prepared by mixing and reacting the foaming raw materials such as polyols, expanders, diisocyanates and foaming agents, etc., and then the foaming masterbatches are injected into the foaming space of the mold device by an injection molding machine for foaming molding, or the raw materials are mixed in a two-liquid method and a foaming agent is added for foaming molding.

[0003] However, the foaming space inside the existing mold device is usually composed of the mold cavity of the upper mold and the mold cavity of the lower mold. Because the interior of the mold device cannot provide the foaming raw materials to react into thermoplastic foaming materials in advance, in the foaming process, the foaming raw materials must first be mixed and reacted to obtain the foaming masterbatch to stabilize the foaming efficiency of the foaming masterbatch. In addition, there is a lack of a solution to the problem that the air in the mold cannot be completely removed during the foaming process, resulting in insufficient vacuum in the foaming space inside the mold device. At this time, the foaming masterbatch is prone to rupture of the foam cells in the foam body due to the residual air in the foaming space during the foaming process to form a foam body. In addition to destroying the air cushion characteristics of the foam body, it is more likely that holes will be formed on the surface of the foam body due to the inability to remove the gas, so that the foam body will have defects. In this way, the foaming process will inevitably consume the cost of mixing and granulation and subsequent injection and foaming processes.

[0004] In addition, the existing mold device usually first applies a release agent in the mold cavity during foaming demolding, and then uses an extruder to inject the foaming masterbatch into the mold cavity of the mold device to foam and form the foamed molded body. The release agent is conducive to the foamed molded body being directly demolded and removed from the mold cavity; however, the existing mold device still has some defects in using the release agent as a foaming demolding means. For example, the silicone release agent is in the form of a coating oil and has fluidity. Therefore, the mold is easily contaminated during the process of applying the release agent to the mold cavity of the mold device. The surface of the mold cavity must be cleaned before secondary processing to remove residual dirt, otherwise the mold dirt will be easily transferred to the foamed molded body, thereby reducing the yield rate of the foaming process applied to the mold device.

[0005] Therefore, the current foaming mold and process are still not perfect and need to be improved. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a foaming mold device and a method for preparing a foamed molded body and a foamed molded body. Through the design of the foaming mold device and the use of a vacuum foaming process, the steps and costs of the foaming process can be saved.

[0007] In order to achieve the above-mentioned purpose, the foaming mold device provided by the present invention includes an upper mold unit, a lower mold unit and a vacuum unit; the upper mold unit has a mold core on the inner side, and the upper mold unit has an air hole running through it; the lower mold unit is arranged opposite to the upper mold unit, and the inner side of the lower mold unit has a mold cavity corresponding to the mold core for filling a polymer foaming raw material, when one or both of the upper mold unit and the lower mold unit are driven to close the mold, a mold chamber space is formed between the mold core and the mold cavity, and the air hole of the upper mold unit is connected to the mold chamber space; the vacuum unit is connected to the air hole of the upper mold unit, and vacuums the mold chamber space, so that the polymer foaming raw material is vacuum foamed in the mold chamber space.

[0008] In one of the embodiments, the lower mold unit includes a lower mold base, the inner side of the lower mold base is recessed with the mold cavity, the mold cavity is provided with a plurality of positioning grooves for placing a gasket, the lower mold base is provided with a plurality of air flow ducts, the plurality of air flow ducts penetrate the mold cavity from the outside of the lower mold base corresponding to the plurality of positioning grooves, when each of the gaskets is placed in each of the positioning grooves, the plurality of gaskets respectively seal the openings of the plurality of air flow ducts in the plurality of positioning grooves, so that the air flow ducts of the lower mold base are not connected to the mold chamber space.

[0009] In one of the embodiments, it further includes an air supply unit connected to the multiple air flow ducts of the lower mold unit, and the air supply unit can switch to set a negative pressure mode and a positive pressure mode. When each of the gaskets is placed in each of the positioning grooves, the air supply unit sets the negative pressure mode to perform negative pressure suction on the multiple positioning grooves through the multiple air flow ducts. Each of the gaskets is adsorbed by the negative pressure of the air supply unit and is fixed in each of the positioning grooves to close the openings of the multiple air flow ducts. When the air supply unit switches to set the positive pressure mode, positive pressure is blown to the multiple positioning grooves through the multiple air flow ducts, and the multiple gaskets are pushed accordingly to detach from the multiple positioning grooves.

[0010] In one of the embodiments, the vacuum unit includes a vacuum guide rod that penetrates the upper mold unit through the air hole, and the interior of the vacuum guide rod has a hollow channel to connect to the mold chamber space. One end of the vacuum guide rod is linked to a plug located on the inner side of the upper mold unit, and the vacuum guide rod is driven to switch between a vacuum position and a closed position relative to the upper mold unit. When the vacuum guide rod is located at the vacuum position, the hollow channel of the vacuum guide rod is connected to the mold chamber space for vacuuming. When the vacuum guide rod is switched to the closed position, the plug of the vacuum guide rod seals the air hole so that the hollow channel of the vacuum guide rod is not connected to the mold chamber space.

[0011] The exhaust guide rod has a hollow tube and an exhaust joint, the hollow tube penetrates the upper mold unit along the air hole, the hollow tube has the hollow passage inside, the hollow tube has a first end located outside the upper mold unit, the exhaust joint is sleeved on the first end, the hollow tube has a second end passing through the inner side of the upper mold unit, the plug is connected to the hollow tube by closing the port of the second end, and the circumferential surface of the second end is penetrated by a radial hole connected to the hollow passage.

[0012] The upper mold unit includes an upper mold base, the mold core is formed on the inner side of the upper mold base, the air hole penetrates the mold core longitudinally from the upper mold base, and the mold core is located at one end of the air hole and is recessed with a receiving groove corresponding to the plug part. When the exhaust guide rod is driven to the closed position, the plug part is received in the receiving groove to close the air hole, and the radial hole of the hollow tube is hidden in the air hole.

[0013] The vacuum unit includes an elastic member sleeved on the exhaust guide rod, the hollow tube has a fixed ring located outside the upper mold unit, the elastic member surrounds the circumference of the hollow tube, and the two ends of the elastic member elastically press against the fixed ring and the outer side of the upper mold unit, so that the exhaust guide rod is pressed by the elastic member and is normally located in the closed position.

[0014] The upper mold unit includes an upper mold base and a movable module, wherein an upper mold mounting groove is recessed on the inner side of the upper mold base, the upper mold base is provided with the air hole, and the upper mold mounting groove has a side hole connected to the air hole. The movable module is arranged in the upper mold mounting groove, and the mold core is formed on the outer side of the movable module. The movable module is driven to move relative to the upper mold base and movably opens or closes the side hole.

[0015] The upper mold unit includes an actuator, which is located outside the upper mold base and connected to the movable module. The movable module is convexly provided with at least one follower block on the inner side opposite to the mold core. The follower block penetrates the upper mold mounting groove and extends out of the upper mold base. The actuator is connected to the follower block and drives the movable module to switch between a vacuum position and a closed position. When the upper mold base and the lower mold base are driven to close the mold, the upper mold mounting groove is connected to the mold cavity to form the mold chamber space, and the movable module is in the vacuum position. The movable module opens the side hole, and the vacuum unit is connected to the mold chamber space through the air hole of the upper mold base for vacuum extraction. When the movable module is driven to switch to the closed position, the movable module is tightly fitted with the mold cavity and closes the side hole to form a foaming space, so that the polymer foaming raw material is located in the foaming space for vacuum foaming.

[0016] The actuator includes a driving base and a rotating switch, the driving base is locked to the driven block of the movable module, one side of the driving base has a pulling protrusion, the rotating switch can be rotatably arranged on the outside of the upper mold base, and the rotating switch is adjacent to the pulling protrusion of the driving base, the rotating switch is defined with a rotating axis, and the rotating switch is provided with a first handle and a second handle around the rotating axis, the first handle is driven to rotate to press against the bottom of the pulling protrusion, the pulling protrusion is pressed by the first handle to link the driving base and the movable module to the exhaust position, the second handle is driven to rotate to press against the top of the pulling protrusion, the pulling protrusion is pressed by the second handle to link the driving base and the movable module to the closed position.

[0017] The upper mold unit includes an upper mold base and a movable module, the inner side of the upper mold base is recessed with an upper mold mounting groove, and an annular groove surrounds the upper mold mounting groove, the upper mold base is penetrated by an upper mold air hole connected to the upper mold mounting groove, the movable module is installed in the upper mold mounting groove, and the mold core is formed on the outer side of the movable module, wherein the movable module is penetrated by an upper mold through hole and an upper mold side hole, the upper mold through hole connects the upper mold mounting groove and the upper mold air hole, and the upper mold side hole connects the upper mold through hole and the annular groove, wherein the movable module is driven to move relative to the upper mold seat in the upper mold mounting groove.

[0018] The inner side of the movable module is convexly provided with at least one upper die follower block to penetrate the upper die installation groove and extend out of the upper die seat. The upper die unit includes an upper die driving base, which is connected to the upper die follower block and drives the movable module to move up and down.

[0019] The lower mold unit includes a lower mold base and a ring base module, the mold cavity is recessed on the inner side of the lower mold base, the mold cavity is convexly provided on the ring base module, and the mold cavity is divided into an outer ring mold cavity area and an inner ring mold cavity area relative to the ring base module, the outer ring mold cavity area surrounds the ring base module, and the inner ring mold cavity area is surrounded by the ring base module and is located on the inner side of the ring base module for accommodating the polymer foaming raw material, wherein when the upper mold base and the lower mold base are driven to close the mold, the annular groove of the upper mold base connects the outer ring mold cavity area and the inner ring mold cavity area of ​​the lower mold base to form the mold chamber space, the vacuum unit vacuums the mold chamber space through the upper mold air hole of the upper mold base to connect the upper mold through hole of the movable module, and when the movable module is driven to close the ring base module, the movable module closes the inner ring mold cavity area to form a foaming space, so that the polymer foaming raw material is located in the foaming space for vacuum foaming.

[0020] The inner side of the lower die seat is recessed into a lower die installation groove from the bottom of the die cavity groove, and the lower die installation groove is located between the outer ring die cavity area and the inner ring die cavity area. The ring seat module is movably installed in the lower die installation groove, and the ring seat module has at least one lower die follower block that penetrates the lower die installation groove and extends out of the lower die seat. The lower die unit includes a lower die driving base, and the lower die driving base is connected to the lower die follower block and drives the ring seat module to move up and down relative to the lower die seat.

[0021] The lower mold base is penetrated by a lower mold air hole connected to the lower mold mounting groove to connect the vacuum unit, and the ring seat module is penetrated by a lower mold through hole and a lower mold side hole, the lower mold through hole connects the lower mold mounting groove and the lower mold air hole, and the lower mold side hole connects the lower mold through hole and the outer ring mold cavity area.

[0022] The upper mold driving base and the lower mold driving base independently drive the movable module and the ring seat module to move respectively, and the movable module and the ring seat module can be switched between an initial vacuum state, a mold closing and foaming state and a mold opening state. When the movable module and the ring seat module are in the initial vacuum state, the vacuum unit connects the upper mold unit and the lower mold unit to vacuum the mold chamber space. When the movable module and the ring seat module are switched to the mold closing and foaming state, the movable module and the ring seat module are driven to press against each other, and the inner ring mold cavity area on the inner side of the ring seat module is closed by the movable module to form the foaming space. When the movable module and the ring seat module are switched to the mold opening state, the movable module is driven to be received into the upper mold mounting groove, and the ring seat module is driven to descend and maintain the protrusion in the mold cavity.

[0023] Another embodiment of the present invention provides a method for preparing a foaming molded body, which includes the following steps: preparing a foaming mold device, and before an upper mold unit and a lower mold unit of the foaming mold device are molded together, a polymer foaming raw material is pre-filled into a mold cavity inside the lower mold unit; driving the upper mold unit and the lower mold unit to mold together, a mold chamber space is formed between a mold core inside the upper mold unit and the mold cavity of the lower mold unit, and an air hole of the upper mold unit is connected to the mold chamber space; starting a vacuum unit, and the vacuum unit vacuums the mold chamber space through the air hole connected to the upper mold unit; when the mold chamber space reaches a preset vacuum state, heating the upper mold unit and the lower mold unit so that the polymer foaming raw material is heated and foamed in the mold chamber space to form a foaming molded body; and releasing the vacuum state of the mold chamber space, driving the upper mold unit and the lower mold unit to open the mold to take out the foaming molded body.

[0024] In one of the embodiments, the polymer foaming raw material is a liquid or powder material comprising a thermoplastic foaming raw material and a foaming agent. The thermoplastic foaming raw material and the foaming agent are uniformly mixed in advance to form the polymer foaming raw material, and then the polymer foaming raw material is filled into the mold cavity on the inner side of the lower mold unit, wherein the thermoplastic foaming raw material comprises a reaction raw material of one of ethylene-vinyl acetate copolymer (EVA), synthetic rubber (Synthetic Rubber) and thermoplastic elastomer (TPU).

[0025] In one of the embodiments, a gasket is pre-placed in each of the multiple installation grooves in the mold cavity, and then the polymer foaming raw material is filled into the mold cavity to cover the multiple gaskets, wherein a lower mold base of the lower mold unit is connected to an air supply unit, and the air supply unit sets a negative pressure mode to perform negative pressure suction on the multiple positioning grooves through multiple air flow ducts inside the lower mold base, and each of the gaskets is adsorbed by the negative pressure of the air supply unit and is fixed in each of the positioning grooves to close the openings of the multiple air flow ducts.

[0026] In one of the embodiments, when the upper mold unit and the lower mold unit are opened, the foamed molded body and the multiple gaskets are combined together due to foaming and hot melting, and the air supply unit is switched to a positive pressure mode. The air supply unit blows positive pressure to the multiple positioning grooves through the multiple air flow ducts, so as to blow positive pressure to the multiple positioning grooves through the multiple air flow ducts and push the multiple gaskets accordingly, so that the foamed molded body is separated from the mold cavity by the air pressure thrust of the air supply unit.

[0027] In one of the embodiments, a vacuum guide rod of the vacuum unit is connected to the mold chamber space through the air hole, and the vacuum guide rod is driven to a vacuum position so that a hollow channel inside the vacuum guide rod is connected to the mold chamber space, and the vacuum unit vacuums the mold chamber space through the vacuum guide rod.

[0028] In one of the embodiments, when the mold chamber space reaches a preset vacuum state, the exhaust guide rod is driven to switch to a closed position, and a plug portion of the exhaust guide rod seals the air hole, so that the hollow channel of the exhaust guide rod is not connected to the mold chamber space, so that the polymer foaming raw material is located in the mold chamber space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

[0029] In one of the embodiments, when the upper mold unit and the lower mold unit are closed, a movable module of the upper mold unit can be driven by an actuator and pre-positioned in an upper mold mounting groove on the inner side of an upper mold base. The movable module opens a side hole of the upper mold base to connect the air hole and the mold chamber space, and the vacuum unit connects the mold chamber space through the air hole of the upper mold base to perform vacuum extraction.

[0030] In one of the embodiments, when the mold chamber space reaches a preset vacuum state, the movable module is driven by the actuator to switch to a closed position, so that the movable module is tightly fitted into the mold cavity and the side hole is closed, and a foaming space is formed between the movable module and the mold cavity, so that the polymer foaming raw material is located in the foaming space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

[0031] In one embodiment, the polymer foaming material is pre-filled into an inner ring cavity area of ​​the cavity, the inner ring cavity area is surrounded by the ring seat module, and an outer ring cavity area of ​​the cavity surrounds the ring seat module.

[0032] In one of the embodiments, when the upper mold unit and the lower mold unit are closed, a movable module of the upper mold unit can be actuated by an upper mold driving base and movably displaced in an upper mold mounting groove on the inner side of an upper mold base, an upper mold through hole and an upper mold side hole of the movable module are respectively connected to an upper mold air hole and an annular groove of the upper mold base, and the annular groove connects the outer ring mold cavity area and the inner ring mold cavity area to form the mold chamber space, and the vacuum unit vacuums the mold chamber space through the upper mold air hole of the upper mold base to connect to the upper mold through hole of the movable module.

[0033] In one of the embodiments, when the mold chamber space reaches a preset vacuum state, the movable module is driven to engage with the ring seat module, the movable module closes the inner ring mold cavity area, and a foaming space is formed between the movable module and the ring seat module, so that the polymer foaming raw material is located in the foaming space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

[0034] In one of the embodiments, the ring seat module can be actuated by a lower mold driving base and movably installed in a lower mold mounting groove on the inner side of a lower mold seat, the lower mold mounting groove is recessed from the bottom of the mold cavity groove and is located between the outer ring mold cavity area and the inner ring mold cavity area, and the lower mold through hole and the lower mold side hole inside the ring seat module are respectively connected to the lower mold air hole of the lower mold seat and the outer ring mold cavity area.

[0035] In one of the embodiments, the upper mold driving base and the lower mold driving base independently drive the movable module and the ring seat module to move, and the movable module and the ring seat module can be switched between an initial vacuum state, a mold closing and foaming state and a mold opening state. When the movable module and the ring seat module are in the initial vacuum state, the vacuum unit connects the upper mold unit and the lower mold unit to vacuum the mold chamber space. When the movable module and the ring seat module are switched to the mold closing and foaming state, the movable module and the ring seat module are driven to abut against each other, and the inner ring mold cavity area on the inner side of the ring seat module is closed by the movable module to form the foaming space. When the movable module and the ring seat module are switched to the mold opening state, the movable module is driven to be received into the upper mold mounting groove, and the ring seat module is driven to descend and maintain the protrusion in the mold cavity.

[0036] Another embodiment of the present invention provides a foamed molded body prepared by the above-mentioned method for preparing a foamed molded body, wherein the foamed molded body contains a plurality of fine closed bubbles.

[0037] In one embodiment, the foamed molded body may be a shoe midsole configuration or a flat plate configuration. When the foamed molded body is a shoe midsole configuration, the foamed molded body comprises a shoe body, the bottom side surface of the shoe body is formed with a ring groove, an inner ring portion is located on the inner side of the ring groove, and an outer ring portion surrounds the outer side of the ring groove; or the bottom side surface of the shoe body is combined with a plurality of gaskets, and the plurality of gaskets are combined with the shoe body by hot melt; when the foamed molded body is a flat plate configuration, the foamed molded body comprises a plate body, one side of the plate body is combined with a plurality of gaskets, and the plurality of gaskets are combined with the plate body by hot melt.

[0038] The effect of the present invention is that the vacuum unit can directly perform vacuum treatment on the mold chamber space inside the foaming mold device through the air holes of the upper mold unit, so that the mold chamber space reaches a predetermined vacuum state, allowing the polymer foaming raw material to be vacuum foamed in the mold chamber space to obtain a foamed body with the maximum number of closed bubbles, thereby solving the problem of insufficient vacuum inside the existing mold device, improving the defect of bursting of foam bubbles in the foamed body, and thus improving the yield of the foaming process.

[0039] In addition, the method for preparing a foamed molded body by the aforementioned foaming mold device directly uses the polymer foaming raw material to fill the mold cavity for vacuum foaming, so as to save the mixing, granulation and injection steps in the existing foaming process, which not only reduces the cost of the shoe process and improves the overall process efficiency, but also the foaming mold device can provide a one-time foaming effect to form the foamed molded body. The foamed molded body is uniformly vacuum foamed in the mold chamber space, which improves the foaming yield of the finished sole, and the foamed molded body has a maximum number of closed bubbles, so that the foamed molded body has excellent elasticity and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a stereoscopic view of a foaming mold device according to a first preferred embodiment of the present invention.

[0041] Figure 2 This is a structural exploded view of the foaming mold device according to the first preferred embodiment of the present invention.

[0042] Figure 3 It is a top view of the foaming mold device according to the first preferred embodiment of the present invention.

[0043] Figure 4 for Figure 3 In the cross-sectional view obtained along section line 4-4, the suction guide rod is in the closed position.

[0044] Figure 5 This is a top view of the lower mold unit in the foaming mold device of the first preferred embodiment of the present invention.

[0045] Figure 6 for Figure 5 A cross-sectional view taken along section line 6-6.

[0046] Figure 7 This is a structural diagram of the exhaust duct in the foaming mold device of the first preferred embodiment of the present invention.

[0047] Figure 8 It is a cross-sectional view of the exhaust duct in the foaming mold device according to the first preferred embodiment of the present invention.

[0048] Fig. 9This is a flow chart of steps A1 to A5 of a method for preparing a foamed molded body using a foaming mold device according to a first preferred embodiment of the present invention.

[0049] Fig.10 This is a detailed flow chart of steps A3 to A5 in the method for preparing a foamed molded body using a foaming mold device according to the first preferred embodiment of the present invention.

[0050] Fig.11 This is a cross-sectional view of the foaming mold device according to the first preferred embodiment of the present invention when it is switched to the exhaust position.

[0051] Fig.12 This is a cross-sectional view from another perspective of the foaming mold device of the first preferred embodiment of the present invention.

[0052] Fig.13 This is a schematic diagram of a foaming mold device according to a first preferred embodiment of the present invention opening a mold and taking out a foamed molded body.

[0053] Fig.14 This is a three-dimensional diagram of a foamed molded body prepared using a foaming mold device according to a first preferred embodiment of the present invention.

[0054] Fig.15 This is a bottom view of a foamed molded body according to a first preferred embodiment of the present invention.

[0055] Fig.16 It is a stereoscopic view of a foaming mold device according to a second preferred embodiment of the present invention.

[0056] Fig.17 This is a structural exploded view of a foaming mold device according to a second preferred embodiment of the present invention.

[0057] Fig.18 This is a structural diagram of the upper mold unit in the foaming mold device of the second preferred embodiment of the present invention.

[0058] Fig.19 It is a side view of the upper mold unit in the foaming mold device according to the second preferred embodiment of the present invention.

[0059] Fig. 20 It is a top view of the foaming mold device according to the second preferred embodiment of the present invention.

[0060] Fig.21 This is a cross-sectional view of a foaming mold device according to a second preferred embodiment of the present invention, in which a movable module of an upper mold unit is in a vacuum position.

[0061] Fig. 22 This is a cross-sectional view of a foaming mold device according to a second preferred embodiment of the present invention, in which a movable module of an upper mold unit is switched to a closed position.

[0062] Fig.23This is a flow chart of steps B1 to B5 of a method for preparing a foamed molded body using a foaming mold device according to a second preferred embodiment of the present invention.

[0063] Fig.24 This is a detailed flow chart of steps B2 to B5 in the method for preparing a foamed molded body using a foaming mold device according to the second preferred embodiment of the present invention.

[0064] Fig.25 This is a schematic diagram of a foaming mold device according to a second preferred embodiment of the present invention opening a mold and taking out a foamed molded body.

[0065] Fig.26 This is a cross-sectional view of a foaming mold device according to a third preferred embodiment of the present invention, in which a movable module of an upper mold unit is in a vacuum position.

[0066] Fig. 27 This is a cross-sectional view of a foaming mold device according to a third preferred embodiment of the present invention, in which a movable module of an upper mold unit is switched to a closed position.

[0067] Fig.28 It is a schematic structural diagram of a foamed molded body prepared using a foaming mold device according to a third preferred embodiment of the present invention.

[0068] Fig.29 It is a three-dimensional diagram of a foaming mold device according to a fourth preferred embodiment of the present invention.

[0069] Fig.30 This is a structural exploded view of a foaming mold device according to a fourth preferred embodiment of the present invention.

[0070] Fig.31 This is a top view of the lower mold unit in the foaming mold device in the fourth preferred embodiment of the present invention.

[0071] Fig.32 It is a top view of the foaming mold device according to the fourth preferred embodiment of the present invention.

[0072] Fig.33 for Fig.32 A cross-sectional view taken along section line 33-33.

[0073] Fig.34 for Fig.32 The cross-sectional view is obtained along the section line 34 - 34 , wherein the upper mold unit and the lower mold unit are respectively connected to the vacuum unit.

[0074] Fig.35 This is a flow chart of steps C1 to C5 of a method for preparing a foamed molded body using a foaming mold device according to a fourth preferred embodiment of the present invention.

[0075] Fig.36This is a detailed flow chart of steps C2 to C4 in the method for preparing a foamed molded body using a foaming mold device according to the fourth preferred embodiment of the present invention.

[0076] Fig.37 This is a cross-sectional view of a foaming mold assembly in the initial air extraction position according to the fourth preferred embodiment of the present invention.

[0077] Fig.38 It is a cross-sectional view of the foaming mold device according to the fourth preferred embodiment of the present invention when it is switched to the mold closing and foaming position.

[0078] Fig.39 This is a cross-sectional view of the foaming mold according to the fourth preferred embodiment of the present invention when it is switched to the mold opening position.

[0079] Fig.40 This is a schematic diagram of a foaming mold device according to a fourth preferred embodiment of the present invention opening a mold and taking out a foamed molded body.

[0080] Fig.41 This is a three-dimensional diagram of a foamed molded body prepared using a foaming mold device according to a fourth preferred embodiment of the present invention.

[0081] Fig.42 This is a bottom view of a foamed molded body according to a fourth preferred embodiment of the present invention.

[0082] Description of reference numerals:

[0083] 100: Foaming mold device

[0084] 110: Gasket

[0085] 200: Foamed molding

[0086] 210: Shoe body

[0087] 10: Upper die unit

[0088] 11: Upper die seat

[0089] 111: Model

[0090] 112: Container

[0091] 12: Stoma

[0092] 20: Lower die unit

[0093] 21: Lower die seat

[0094] 211: Mold cavity

[0095] 22: Positioning slot

[0096] 23: Airflow duct

[0097] 231: Opening

[0098] 30: Vacuum unit

[0099] 31: Air extraction guide rod

[0100] 311: Hollow tube

[0101] 3111: Hollow Channel

[0102] 3112: First End

[0103] 3113: Second end

[0104] 3114: Radial holes

[0105] 312: Air extraction connector

[0106] 313: Saibu

[0107] 314: Fixed ring

[0108] 32: Elastic parts

[0109] 40: Air supply unit

[0110] S1: Mold room space

[0111] G1: Closed position

[0112] G2: Pumping position

[0113] A1~A5: Steps

[0114] 300, 300': Foaming mold device

[0115] 400, 400': Foamed molding

[0116] 410': plate body

[0117] 420': Gasket

[0118] 50, 50': Upper die unit

[0119] 51, 51': Upper die seat

[0120] 511, 511': Upper die installation groove

[0121] 512: Stoma

[0122] 513, 513': side hole

[0123] 52, 52': Activity module

[0124] 521: Model

[0125] 522: Driven block

[0126] 53, 53': Actuating parts

[0127] 531: Driving base

[0128] 5311: Pull the bump

[0129] 532: Turn the switch

[0130] 5321: Rotation axis

[0131] 5322: First in command

[0132] 5323: Second in command

[0133] 60, 60': Lower die unit

[0134] 61, 61': Lower die seat

[0135] 611, 611': mold cavity

[0136] 62, 62': Positioning groove

[0137] 63, 63': air flow duct

[0138] 70, 70': Vacuum unit

[0139] 80, 80': Air supply unit

[0140] H1, H1': exhaust position

[0141] H2, H2': Closed position

[0142] S2, S2': mold room space

[0143] S3, S3': Foaming space

[0144] B1~B5: Steps

[0145] 500: Foaming mold device

[0146] 600: Upper die unit

[0147] 610: Upper die seat

[0148] 610a: Upper die installation groove

[0149] 610b: Ring groove

[0150] 610c: Upper die pore

[0151] 620: Activity Module

[0152] 620a: Model

[0153] 620b: Upper die through hole

[0154] 620c: Upper die side hole

[0155] 620d: Upper die follower

[0156] 630: Upper die drive base

[0157] 700: Lower die unit

[0158] 710: Lower die seat

[0159] 710a: Cavity

[0160] 710a1: Outer ring mold cavity area

[0161] 710a2: Inner ring mold cavity area

[0162] 710b: Lower die installation slot

[0163] 710c: lower die air hole

[0164] 720: Ring seat module

[0165] 720a: Lower die follower

[0166] 720b: lower die through hole

[0167] 720c: lower die side hole

[0168] 730: Lower die drive base

[0169] 800: Vacuum unit

[0170] T1: Initial pumping state

[0171] T2: mold closing and foaming state

[0172] T3: Mold opening state

[0173] S4: Mold room space

[0174] S5: Foaming space

[0175] C1~C5: Steps DETAILED DESCRIPTION

[0176] In order to more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Figure 1 , Figure 2 , which is a foaming mold device 100 provided in a first preferred embodiment of the present invention, comprises an upper mold unit 10, a lower mold unit 20, a vacuum unit 30 and an air supply unit 40.

[0177] The upper mold unit 10 includes an upper mold base 11 and an air hole 12. The upper mold base 11 has a mold core 111 inside. Figures 2 to 4As shown, the inner side of the upper mold base 11 is an integrally formed mold core 111, and the mold core 111 is equivalent to the contour of the midsole of the shoe. The air hole 12 vertically penetrates the mold core 111 from the upper mold base 11, and a receiving groove 112 is recessed on the mold core 111 at one end of the air hole 12.

[0178] The lower mold unit 20 is arranged opposite to the upper mold unit 10. The lower mold unit 20 includes a lower mold base 21 corresponding to the upper mold base 11 of the upper mold unit 10. The inner side of the lower mold base 21 is concavely formed with a mold cavity 211. The mold cavity 211 is a midsole shoe-shaped contour corresponding to the mold core 111 of the upper mold unit 10 for filling a polymer foaming raw material, wherein the polymer foaming raw material is not a granulated particle, but a liquid or powder material containing a thermoplastic foaming raw material and a foaming agent; Figure 5 , Figure 6 As shown, in the first embodiment, a plurality of positioning grooves 22 are provided in the mold cavity 211 for placing a gasket (not shown in the figure), and the material of the gasket is preferably the same as the material of the polymer foaming raw material, but not limited to this, wherein a plurality of airflow ducts 23 are penetrated inside the lower mold base 21, and the plurality of airflow ducts 23 penetrate the bottom of the mold cavity 211 from the outside of the lower mold base 21 corresponding to the plurality of positioning grooves 22, so that the plurality of airflow ducts 23 connect the outside of the lower mold base 21 with the plurality of positioning grooves 22. In actual operation, the gaskets are first placed in each of the positioning grooves 22 of the lower mold base 21 to seal the openings 231 of the plurality of airflow ducts 23 in the plurality of positioning grooves 22, and then the polymer foaming raw material is filled into the mold cavity 211 in a non-injection manner to cover the plurality of gaskets.

[0179] In the first embodiment, the upper mold unit 10 and the lower mold unit 20 are driven to move up and down independently. Figure 4 As shown, when one or both of the upper mold unit 10 and the lower mold unit 20 are driven to close the mold, the upper mold base 11 and the lower mold base 21 are close together, and the mold core 111 and the mold cavity 211 are correspondingly close to form a mold chamber space S1, and the air hole 12 of the upper mold unit 10 is connected to the mold chamber space S1. At this time, the opening 231 of the air flow duct 23 of each positioning groove 22 in the mold cavity 211 is sealed by the gasket, so that there is no connection between the air flow duct 23 of the lower mold base 21 and the mold chamber space S1.

[0180] The vacuum unit 30 is connected to the air hole 12 of the upper mold unit 10, and vacuumizes the mold chamber space S1, so that the polymer foaming material is vacuum foamed in the mold chamber space S1. Figure 4 , Figure 7 and Figure 8As shown, the vacuum unit 30 includes an air suction guide rod 31 and an elastic member 32. The air suction guide rod 31 penetrates the upper mold base 11 and the mold core 111 through the air hole 12 of the upper mold unit 10. The air suction guide rod 31 includes a hollow tube 311, an air suction joint 312 and a plug 313. The hollow tube 311 penetrates the upper mold unit 10 along the air hole 12, and the hollow tube 311 has a hollow channel 3111 inside to communicate with the mold chamber space S1. The hollow tube 311 has a first end 3112 located outside the upper mold unit 10. The air suction joint 31 2 is sleeved on the first end 3112 to connect to a vacuum device (not shown in the figure), the hollow tube 311 has a second end 3113 that penetrates into the inner side of the upper mold unit 10, the plug 313 is linked to the second end 3113 of the hollow tube 311 of the exhaust guide rod 31, the plug 313 is connected to the hollow tube 311 by closing the port of the second end 3113, so that the plug 313 is connected to the hollow tube 311 and is located on the inner side of the upper mold unit 10, and a radial hole 3114 is penetrated on the circumference of the second end 3113 of the hollow tube 311 to communicate with the hollow channel 3111.

[0181] The elastic member 32 is a spring that is sleeved on the exhaust guide rod 31. The hollow tube 311 has a fixing ring 314 located outside the upper mold unit 10. The elastic member 32 surrounds the circumference of the hollow tube 311, and the two ends of the elastic member 32 elastically abut against the fixing ring 314 and the outer side of the upper mold unit 10. In addition, the exhaust guide rod 31 is driven to switch between a closed position G1 and an exhaust position G2 relative to the upper mold unit 10 (see also Figure 4 , Fig.11 ), because the exhaust guide rod 31 is pushed against by the elastic member 32 and is normally located in the closed position G1, when the exhaust guide rod 31 is in the closed position G1, the plug portion 313 of the exhaust guide rod 31 is received in the receiving groove 112 of the upper mold base 11 to close the air hole 12, and the radial hole 3114 of the hollow tube 311 is hidden in the air hole 12, so that the hollow channel 3111 of the exhaust guide rod 31 is not connected with the mold chamber space S1, and when the exhaust guide rod 31 is switched to the exhaust position G2, the exhaust guide rod 31 moves downward toward the lower mold unit 20 and compresses the elastic member 32, so that the radial hole 3114 of the hollow tube 311 is not blocked by the inner wall of the air hole 12 of the upper mold base 11 and can be connected to the mold chamber space S1, so that the hollow channel 3111 of the exhaust guide rod 31 is connected to the mold chamber space S1 for vacuuming.

[0182] The air supply unit 40 is connected to the plurality of air flow pipes 23 of the lower mold unit 20 through pipelines (see Figure 4 , Figure 6 ), the air supply unit 40 is capable of switching to set a negative pressure mode and a positive pressure mode. When each of the gaskets (not shown in the figure) is placed in each of the positioning grooves 22 in the mold cavity 211 of the lower mold unit 20, the air supply unit 40 sets the negative pressure mode to perform negative pressure suction on the multiple positioning grooves 22 through the multiple air flow ducts 23. At this time, each of the gaskets is adsorbed by the negative pressure of the air supply unit 40, so that each of the gaskets is fixed in each of the positioning grooves 22 to close the openings 231 of the multiple air flow ducts 23. When the air supply unit 40 switches to set the positive pressure mode, positive pressure is blown to the multiple positioning grooves 22 through the multiple air flow ducts 23 and the multiple gaskets are pushed accordingly to detach from the multiple positioning grooves 22.

[0183] In other embodiments, the upper mold unit 10, the lower mold unit 20, the vacuum unit 30 and the air supply unit 40 can adjust the structure according to the foaming requirements. For example, the inner groove 112 of the upper mold unit 10 can be omitted, as long as the plug 313 of the vacuum guide rod 31 can seal the air hole 12 of the upper mold base 11 when the vacuum guide rod 31 is in the closed position G1; the number and setting position of the positioning grooves 22 in the mold cavity 211 of the lower mold unit 20 can be adjusted according to the requirements, or the positioning grooves 22 of the lower mold unit 20 and the air flow duct 23 can be omitted, and the air supply unit 40 can also be omitted accordingly, as long as the mold cavity 211 of the lower mold unit 20 can accommodate the polymer foaming raw material, there is no restriction on the necessary design of the multiple positioning grooves 22 and the multiple air flow ducts 23; the exhaust guide rod 31 of the vacuum unit 30 only needs to have a hollow channel 3111 inside, and one end of the exhaust guide rod 31 has a plug 313 that can close the air hole 12, and there is no restriction on the exhaust guide rod 31 having the hollow tube 311, the exhaust joint 312 and the elastic member 32 structure.

[0184] Through the structural design of the foaming mold device 100 of the present embodiment, the vacuum unit 30 can directly perform vacuum treatment on the mold chamber space S1 inside the foaming mold device 100 through the air hole 12 of the upper mold unit 10, so that the mold chamber space S1 reaches a predetermined vacuum state, allowing the polymer foaming raw material to be vacuum foamed in the mold chamber space S1 to obtain a foamed molded body with the maximum number of closed bubbles, thereby solving the problem of insufficient vacuum inside the existing mold device, improving the defect of rupture of foaming bubbles in the foamed molded body, and thus improving the yield of the foaming process.

[0185] In the first embodiment, the exhaust guide rod 31 of the vacuum unit 30 is designed to be driven to switch between the closed position and the exhaust position. When the exhaust guide rod 31 is in the closed position G1, the plug 313 of the exhaust guide rod 31 closes the air hole 12, so that the hollow channel 3111 of the exhaust guide rod 31 is not connected with the mold chamber space S1. When the exhaust guide rod 31 is switched to the exhaust position G2, the exhaust guide rod 31 moves downward toward the lower mold unit 20, so that the exhaust guide rod 31 can connect to the mold chamber space S1 for vacuuming. When the mold chamber space S1 reaches a predetermined vacuum state, the exhaust guide rod 31 can reset to the closed position, so that the mold chamber space S1 is continuously maintained in a vacuum state, thereby providing the foaming mold device 100 with the function of vacuum foaming.

[0186] In addition, the air supply unit 40 can selectively set the negative pressure mode and the positive pressure mode. The negative pressure mode can perform negative pressure suction on the multiple positioning grooves 22 through the multiple air flow ducts 23, so that the preset gaskets in each of the positioning grooves 22 can more firmly close the openings 231 of the multiple air flow ducts 23. The positive pressure mode, on the contrary, blows positive pressure air to the multiple positioning grooves 22 through the multiple air flow ducts 23, and correspondingly pushes the multiple gaskets to detach from the multiple positioning grooves 22. The design of the air supply unit 40 can be applied to the demolding process of the foaming molded body, which helps the foaming molded body in the foaming mold device 100 to be demolded by the positive pressure blowing of the air supply unit 40, thereby reducing the use of the release agent and improving the problem of mold contamination caused by the release agent.

[0187] See also Figures 9 to 13 As shown, the method for preparing a foamed molded body 200 using the aforementioned foaming mold device 100 in the first preferred embodiment of the present invention comprises the following steps:

[0188] Step A1, prepare the foaming mold device 100. Before the upper mold unit 10 and the lower mold unit 20 of the foaming mold device 100 are molded together, the polymer foaming raw material is pre-filled into the mold cavity 211 on the inner side of the lower mold unit 20. In the first embodiment, a gasket 110 is pre-placed in each of the multiple mounting grooves in the mold cavity 211, and then the polymer foaming raw material is non-injected into the mold cavity 211 to cover the multiple gaskets 110, wherein the multiple gaskets 110 and the polymer foaming raw material are all made of the same plastic material. More specifically, the polymer foaming raw material is not granulated particles, but a liquid or powder material comprising a thermoplastic foaming raw material and a foaming agent. The thermoplastic foaming raw material and the foaming agent are pre-mixed uniformly to form the polymer foaming raw material, wherein the thermoplastic foaming raw material comprises a reaction raw material of one of ethylene-vinyl acetate copolymer (EVA), synthetic rubber (Synthetic Rubber) and thermoplastic elastomer (TPU).

[0189] At this time, the lower mold base 21 of the lower mold unit 20 is connected to the air supply unit 40, and the air supply unit sets the negative pressure mode to perform negative pressure suction on the multiple positioning grooves 22 through the multiple air flow ducts 23 inside the lower mold base 21. Each of the gaskets 110 is adsorbed by the negative pressure of the air supply unit 40 to close the openings 231 of the multiple air flow ducts 23, so that the polymer foaming raw material will not overflow into the air flow duct 23 of the lower mold base 21.

[0190] Step A2, driving the upper mold unit 10 and the lower mold unit 20 to close the mold, the mold core 111 on the inner side of the upper mold unit 10 and the mold cavity 211 of the lower mold unit 20 are correspondingly tightly fitted to form the mold chamber space S1, and the air hole 12 of the upper mold unit 10 is connected to the mold chamber space S1, at this time, the exhaust guide rod 31 of the vacuum unit 30 is pushed by the elastic member 32 and maintained in the closed position G1, thereby the plug portion 313 of the exhaust guide rod 31 seals the air hole 12 of the upper mold base 11.

[0191] Step A3, starting the vacuum unit 30, the vacuum unit 30 vacuumizes the mold chamber space S1 through the air hole 12 connected to the upper mold unit 10; Figures 10 to 12 As shown, in the first embodiment, the vacuum unit 30's suction guide rod 31 is connected to the mold chamber space S1 through the air hole 12, and the suction guide rod 31 is driven to switch to the suction position G2, so that the hollow channel 3111 inside the suction guide rod 31 is connected to the mold chamber space S1, and the vacuum unit 30 vacuums the mold chamber space S1 through the suction guide rod 31.

[0192] Step A4, when the mold chamber space S1 reaches a preset vacuum state, the upper mold unit 10 and the lower mold unit 20 are heated, so that the polymer foaming material is heated and foamed in the mold chamber space S1 to form a foamed molded body 200, wherein the heating temperature of the upper mold unit 10 and the lower mold unit 20 is the foaming reaction temperature of the polymer foaming material, which is between 130°C and 240°C; Fig.10 As shown, in the first embodiment, the exhaust guide rod 31 is reset to the closed position G1, the plug portion 313 of the exhaust guide rod 31 seals the air hole 12 of the upper mold base 11, and the hollow channel 3111 of the exhaust guide rod 31 is not connected to the mold chamber space S1, so that the polymer foaming raw material is located in the mold chamber space S1 for vacuum foaming. At this time, the polymer foaming raw material is heated and foamed under a vacuum state, and uniformly expands into the foaming molded body 200 to fill the mold chamber space S1.

[0193] Step A5, releasing the vacuum state of the mold chamber space S1, driving the upper mold unit 10 and the lower mold unit 20 to open the mold, so as to take out the foamed molded body 200; Fig.10 and Fig.13 As shown, in the first embodiment, when the upper mold unit 10 and the lower mold unit 20 are opened, the foamed molded body 200 and the multiple gaskets 110 are combined together due to foaming and hot melting. At this time, the air supply unit 40 is set to the positive pressure mode, and the air supply unit 40 blows positive pressure to the multiple positioning grooves 22 through the multiple air flow ducts 23, so as to blow positive pressure to the multiple positioning grooves 22 through the multiple air flow ducts 23, and correspondingly push the multiple gaskets 110, so that the foamed molded body 200 is separated from the mold cavity 211 by the air pressure thrust of the air supply unit 40, thereby taking out the foamed molded body 200, and the foamed molded body 200 can go through subsequent maturation and shaping stages to stabilize the structural form of the foamed molded body 200.

[0194] See also Fig.14 , Fig.15 The foamed molded body 200 is a shoe midsole configuration, and contains a plurality of fine closed bubbles (not shown) inside, wherein the foamed molded body 200 includes a shoe body 210, and the bottom side of the shoe body 210 is combined with the aforementioned gasket 110, and the plurality of gaskets 110 and the shoe body 210 are combined together by hot melt, thereby the plurality of gaskets 110 can provide the shoe body 210 with maximum grip.

[0195] The method for preparing the foamed molded body 200 by the aforementioned foaming mold device 100 directly uses the polymer foaming raw material to fill the mold cavity 211 of the lower mold unit 20 for vacuum foaming, so as to save the mixing, granulation and injection steps in the existing foaming process, which not only reduces the cost of the shoe process and improves the overall process efficiency, but also the foaming mold device 100 can provide a one-time foaming effect to form the foamed molded body 200. The foamed molded body 200 is uniformly vacuum foamed in the mold chamber space S1, which improves the foaming yield of the foamed molded body 200, and the foamed molded body 200 has a maximum number of closed bubbles, so that the foamed molded body 200 has excellent elasticity and light weight.

[0196] In addition, in step A5, through the design of the air supply unit 40, the demolding process of the foaming molded body 200 can be effectively utilized, which helps the foaming molded body 200 in the foaming mold device 100 to be demolded by the positive pressure blowing of the air supply unit 40, thereby reducing the use of the release agent and improving the problem of mold contamination caused by the release agent.

[0197] Please cooperate Figures 16 to 20 , which is a second preferred embodiment of the present invention, provides a foaming mold device 300, comprising an upper mold unit 50, a lower mold unit 60, a vacuum unit 70 and an air supply unit 80.

[0198] The upper mold unit 50 includes an upper mold base 51, a movable module 52 and an actuating member 53. An upper mold mounting groove 511 is recessed on the inner side of the upper mold base 51. The upper mold base 51 is provided with the air hole 512. The upper mold mounting groove 511 has a side hole 513 connected to the air hole 512. The movable module 52 is arranged in the upper mold mounting groove 511, and a mold core 521 is formed on the outer side of the movable module 52. The movable module 52 is driven to move relative to the upper mold base 51 and movably opens or closes the side hole 513.

[0199] The actuating member 53 is located outside the upper die base 51 and connected to the movable module 52. Fig.18 , Fig.19 As shown, the movable module 52 is provided with two follower blocks 522 on the inner side opposite to the mold core 521. The two follower blocks 522 penetrate the upper mold mounting groove 511 and extend out of the upper mold base 51. The actuator 53 connects the two follower blocks 522 and drives the movable module 52 to switch between a vacuum position H1 and a closed position H2.

[0200] The structure of the actuating member 53 is described in more detail. Fig.19 , Fig. 20As shown, in the second embodiment, the actuator 53 includes a driving base 531 and two rotating switches 532, the driving base 531 is locked to the driven block 522 of the movable module 52, and the driving base 531 has a pulling protrusion 5311 on the opposite sides respectively, and the two rotating switches 532 can be rotatably arranged on the outside of the upper mold base 51, wherein the two rotating switches 532 are symmetrically arranged on both sides of the driving base 531, and the two rotating switches 532 are respectively arranged adjacent to the pulling protrusion 5311 of the driving base 531.

[0201] In the present embodiment, the rotary switch 532 is defined with a rotary axis 5321, and each of the rotary switches 532 is provided with a first handle 5322 and a second handle 5323 around the rotary axis 5321. The first handle 5322 is driven to rotate to press against the bottom of the pulling protrusion 5311. The pulling protrusion 5311 is pressed against by the first handle 5322 to link the driving base 531 and the movable module 52 to move to the exhaust position H1, and the movable module 52 opens the side hole 513 of the upper mold base 51. The second handle 5323 is driven to rotate to press against the top of the pulling protrusion 5311. The pulling protrusion 5311 is pressed against by the second handle 5323 to link the driving base 531 and the movable module 52 to move to the closed position H2, and the movable module 52 closes the side hole 513 of the upper mold base 51.

[0202] In other embodiments, the structure of the upper mold unit 50 can be adjusted as needed. For example, the driving and lifting movement method of the movable module 52 is not limited to the use of the actuator 53 structure, and the movable module 52 can also be electrically driven to move along the slide rail inside the upper mold base 51, which can also achieve the lifting and lowering effect, and the structure of the driven block 522 can be omitted; or the number of the driven blocks 522 can be adjusted to at least one, and the driving protrusion 5311 only needs to be set on one side of the driving base 531 of the actuator 53, and the rotating switch 532 can be replaced by one and the adjacent driving protrusion 5311 is set on one side of the driving base 531.

[0203] The lower mold unit 60 is arranged opposite to the upper mold unit 50. The lower mold unit 60 includes a lower mold base 61 corresponding to the upper mold base 51 of the upper mold unit 50. The inner side of the lower mold base 61 is concavely formed with a mold cavity 611. The mold cavity 611 is a mold core 521 of the upper mold unit 50 corresponding to the midsole shoe shape contour for filling a polymer foaming raw material, wherein the polymer foaming raw material is a liquid or powder material containing a thermoplastic foaming raw material and a foaming agent as in the first embodiment; the structure of the lower mold base 61 in the second embodiment is the same as the structure of the lower mold base 21 in the first embodiment, please refer to Fig.17 , a plurality of positioning grooves 62 are provided in the mold cavity 611 of the lower mold base 61 for placing gaskets (not shown in the figure), and a plurality of airflow ducts 63 are also provided inside the lower mold base 61, and the plurality of airflow ducts 63 penetrate the bottom of the mold cavity 611 from the outside of the lower mold base 61 corresponding to the plurality of positioning grooves 62. When the upper mold base 51 and the lower mold base 61 are driven to close the mold, the movable module 52 is preset at the exhaust position H1, and the upper mold mounting groove 511 surrounds the gap around the mold core 521 of the movable module 52 and is connected with the mold cavity 611 to form the mold chamber space S2. At this time, the side hole 513 of the upper mold base 51 is connected with the mold chamber space S2. When the movable module 52 is tightly fitted in the mold cavity 611 of the lower mold base 61, the movable module 52 and the mold cavity 611 are tightly fitted to form a foaming space S3, so that the polymer foaming raw material is accommodated in the foaming space S3.

[0204] The vacuum unit 70 is connected to the air hole 512 of the upper mold unit 50 through a pipeline, and performs vacuum treatment on the mold chamber space S2, wherein the movable module 52 is preset at the vacuum position H1, and the movable module 52 opens the side hole 513 of the upper mold base 51, so that the vacuum unit 70 is connected to the mold chamber space S2 through the air hole 512 of the upper mold base 51 for vacuuming.

[0205] The air supply unit 80 is connected to the multiple air flow ducts 63 of the lower mold unit 60 through pipelines, wherein the air supply unit 80 of the second embodiment is based on the same principle as the air supply unit 40 of the first embodiment. Similarly, the air supply unit 80 can switch between the negative pressure mode and the positive pressure mode. Therefore, the working principles of the negative pressure mode and the positive pressure mode of the air supply unit 80 are not repeated here.

[0206] Therefore, in the design of the foaming mold device 300 of the second embodiment, the actuator 53 of the upper mold unit 50 can movably control the movable module 52 to relatively open and close the side hole 513 of the upper mold base 51, so that the vacuum unit 70 can perform vacuum treatment on the mold chamber space S2 inside the foaming mold device 300, so that the mold chamber space S2 and the foaming space S3 maintain a vacuum state, so that the polymer foaming material can be vacuum foamed in the foaming space S3.

[0207] See also Fig.23 and Fig.24 As shown, the second preferred embodiment of the present invention uses the aforementioned foaming mold device 300 to prepare a foaming molded body 400, and please refer to Fig.21 , Fig. 22 and Fig.25 The action flow includes the following steps:

[0208] Step B1, prepare the foaming mold device 300. Before the upper mold unit 50 and the lower mold unit 60 of the foaming mold device 300 are molded together, the polymer foaming raw material is pre-filled into the mold cavity 611 on the inner side of the lower mold unit 60. In the second embodiment, a gasket (not shown in the figure) is pre-placed in each of the multiple mounting grooves in the mold cavity 611, and then the polymer foaming raw material is non-injected into the mold cavity 611 to cover the multiple gaskets, wherein the multiple gaskets and the polymer foaming raw material are all made of the same plastic material. The polymer foaming raw material in the second embodiment is also not a granulated particle, but a liquid or powder material containing a thermoplastic foaming raw material and a foaming agent. The thermoplastic foaming raw material and the foaming agent are pre-mixed evenly to form the polymer foaming raw material.

[0209] At this time, the lower mold base 61 of the lower mold unit 60 is connected to the air supply unit 80, and the air supply unit sets the negative pressure mode to perform negative pressure suction on the multiple positioning grooves 62 through the multiple air flow ducts 63 inside the lower mold base 61. Each gasket is adsorbed by the negative pressure of the air supply unit 80 to close the openings of the multiple air flow ducts 63, so that the polymer foaming raw material will not overflow into the air flow duct 63 of the lower mold base 61.

[0210] Step B2, driving the upper mold unit 50 and the lower mold unit 60 to close the mold, forming the mold chamber space S2 between the mold core 521 inside the upper mold unit 50 and the mold cavity 611 of the lower mold unit 60, and the air hole 512 of the upper mold unit 50 is connected to the mold chamber space S2, as shown in FIG. Fig.21 , Fig.24As shown, in the second embodiment, when the upper mold unit 50 and the lower mold unit 60 are closed, the movable module 52 of the upper mold unit 50 can be driven by the actuator 53 and is pre-in the exhaust position H1 in the upper mold mounting groove 511 on the inner side of the upper mold base 51. At this time, the upper mold mounting groove 511 surrounds the gap around the mold core 521 of the movable module 52 and is connected with the mold cavity 611 to form the mold chamber space S2, and the movable module 52 opens the side hole 513 of the upper mold base 51 to connect the air hole 512 and the mold chamber space S2.

[0211] Step B3, starting the vacuum unit 70 , and the vacuum unit 70 evacuates the mold chamber space S2 through the air hole 512 connected to the upper mold unit 50 .

[0212] Step B4, when the mold chamber space S2 reaches a preset vacuum state, the upper mold unit 50 and the lower mold unit 60 are heated, so that the polymer foaming material is heated and foamed in the mold chamber space S2 to form a foamed molded body 400, wherein the heating temperature of the upper mold unit 50 and the lower mold unit 60 is the foaming reaction temperature of the polymer foaming material, which is between 130°C and 240°C; Fig. 22 , Fig.24 As shown, in the second embodiment, the movable module 52 is driven by the actuator 53 to switch to the closed position H2, so that the movable module 52 is displaced toward the lower mold base 61 to close the side hole 513, and at the same time, the movable module 52 is tightly fitted with the mold cavity 611, thereby the movable module 52 and the mold cavity 611 are tightly fitted to form the foaming space S3. At this time, the foaming space S3 is also in a vacuum state, thereby the polymer foaming raw material is located in the foaming space S3 for vacuum foaming, and evenly expands into the foaming molded body 400 to fill the foaming space S3.

[0213] Step B5, releasing the vacuum state of the mold chamber space and the foaming space, driving the upper mold unit 50 and the lower mold unit 60 to open the mold to take out the foamed molded body 400; Fig.24 , Fig.25 As shown, in the second embodiment, when the upper mold unit 50 and the lower mold unit 60 are opened, the foamed molded body 400 and the multiple gaskets are combined together due to foaming and hot melting. At this time, the air supply unit 80 is set to the positive pressure mode, and the air supply unit 80 blows positive pressure air to the multiple positioning grooves 62 through the air flow duct 63 of the lower mold base 61, so as to blow positive pressure air to the multiple positioning grooves 62 through the multiple air flow ducts 63, and correspondingly push the multiple gaskets, so that the foamed molded body 400 is separated from the mold cavity 611 by the air pressure thrust of the air supply unit 80, thereby taking out the foamed molded body 400.

[0214] The foamed molded body 400 obtained in the second embodiment and the foamed molded body 200 of the first embodiment have the same shoe midsole configuration, and thus the foamed molded body of the second embodiment will not be described in detail herein.

[0215] The method for preparing the foamed molded body 400 by the aforementioned foaming mold device 300 also uses the polymer foaming raw material to fill the mold cavity 611 of the lower mold unit 60 for vacuum foaming, so as to save the mixing, granulation and injection steps in the existing foaming process, and the actuator 53 of the upper mold unit 50 can movably control the movable module 52 to relatively open and close the side hole 513 of the upper mold base 51, so that the vacuum unit 70 can vacuum the mold chamber space S2 inside the foaming mold device 300, so that the mold chamber space S2 and the foaming space S3 maintain a vacuum state, so that the polymer foaming raw material can be vacuum foamed in the foaming space S3, providing the efficiency of one-time foaming to form the foamed molded body 400, and improving the foaming yield of the foamed molded body 400.

[0216] Please cooperate Figure 26 to Figure 28 , a foaming mold device 300' provided in the third preferred embodiment of the present invention comprises an upper mold unit 50', a lower mold unit 60', a vacuum unit 70' and an air supply unit 80'. The functions and effects of the upper mold unit 50', the lower mold unit 60', the vacuum unit 70' and the air supply unit 80' of the foaming mold device 300' of the third embodiment are substantially the same as those of the upper mold unit 50, the lower mold unit 60, the vacuum unit 70 and the air supply unit 80 of the foaming mold device 300 of the second embodiment.

[0217] The upper mold unit 50' has an upper mold base 51', a movable module 52' and an actuating member 53'. The upper mold mounting groove 511' of the upper mold base 51' is provided with a side hole 513' to communicate with an air hole (not shown in the figure). The movable module 52' is movably arranged in the upper mold mounting groove 511' of the upper mold base 51'. The actuating member 53' is connected to the movable module 52' and can drive the movable module 52' to move up and down.

[0218] The lower mold unit 60' comprises a lower mold base 61', the inner side of which is recessed a mold cavity 611', wherein the mold cavity 611' is provided with a plurality of positioning grooves 62', and the lower mold base 61' is provided with a plurality of air flow ducts 63' corresponding to the plurality of positioning grooves 62' to connect the mold cavity 611'.

[0219] The structural difference between the foaming mold device 300 ′ of the third embodiment and the foaming mold device 300 of the second embodiment is that the movable module 52 ′ of the upper mold unit 50 ′ of the third embodiment is in the form of a flat plate, and the mold cavity 611 ′ of the lower mold unit 60 ′ is in the form of a flat groove.

[0220] Since the structure and operation mode of the foaming mold device 300' of the third embodiment are substantially the same as those of the foaming mold device 300 of the second embodiment, the foaming mold device 300' of the third embodiment can obtain a flat foaming molded body 400' by using the preparation method steps of the second embodiment; Fig.28 As shown, the foamed molded body 400' is a flat plate configuration, and the foamed molded body includes a plate body 410', and a plurality of gaskets 420' are combined with the bottom side of the plate body 410'. The plurality of gaskets 420' and the plate body 410' are combined together by hot melt, whereby the plate body 410' also has a maximum number of closed bubbles, so that the foamed molded body 400' has excellent elasticity and light weight.

[0221] In addition, please cooperate Figures 29 to 34 , which is a fourth preferred embodiment of the present invention, a foaming mold device 500 includes an upper mold unit 600, a lower mold unit 700, and a vacuum unit 800.

[0222] The upper mold unit 600 includes an upper mold base 610 and a movable module 620. Fig.30 and Fig.33 As shown, the upper die seat 610 has an upper die installation groove 610a recessed inside, and an annular groove 610b surrounding the upper die installation groove 610a. The upper die seat 610 is provided with an upper die air hole 610c connected to the upper die installation groove 610a. The movable module 620 is installed in the upper die installation groove 610a, and a mold core 620a is formed on the outer side of the movable module 620. Fig.34 As shown, the movable module 620 is penetrated by an upper mold through hole 620b and an upper mold side hole 620c, the upper mold through hole 620b is connected to the upper mold mounting groove 610a and the upper mold air hole 610c, and the upper mold side hole 620c is connected to the upper mold through hole 620b and the annular groove 610b, wherein the movable module 620 is driven to displace relative to the upper mold base 610 in the upper mold mounting groove 610a.

[0223] In addition, if Fig.30 and Fig.33As shown, an upper mold follower block 620d is protruded from the inner side of the movable module 620 to penetrate the upper mold mounting groove 610a and extend out of the upper mold base 610, and the upper mold unit 600 includes an upper mold driving base 630, and the upper mold driving base 630 is connected to the upper mold follower block 620d of the movable module 620. The upper mold driving base 630 drives the movable module 620 to move up and down through a driving source (not shown in the figure).

[0224] The lower mold unit 700 includes a lower mold base 710 and a ring base module 720. The lower mold base 710 has a mold cavity 710a recessed inside. The ring base module 720 is convexly disposed in the mold cavity 710a. Fig.31 As shown, in the fourth embodiment, the mold cavity 710a is divided into an outer ring mold cavity area 710a1 and an inner ring mold cavity area 710a2 relative to the ring seat module 720. The outer ring mold cavity area 710a1 surrounds the ring seat module 720, and the inner ring mold cavity area 710a2 is surrounded by the ring seat module 720 and is located on the inner side of the ring seat module 720 to accommodate the polymer foaming raw material.

[0225] More specifically, Fig.33 , Fig.34 As shown, the ring seat module 720 can be independently lifted and moved relative to the lower die seat 710, wherein the inner side of the lower die seat 710 is recessed into a lower die mounting groove 710b from the bottom of the die cavity 710a, and the lower die mounting groove 710b is located between the outer ring die cavity area 710a1 and the inner ring die cavity area 710a2, and the ring seat module 720 is movably installed in the lower die mounting groove 710b, and the ring seat module 720 has a lower die follower block 720a that penetrates the lower die mounting groove 710b and extends out of the lower die seat 710, and the lower die unit 700 includes a lower die driving base 730, and the lower die driving base 730 is connected to the lower die follower block 720a of the ring seat module 720, and the lower die driving base 730 drives the ring seat module 720 to move up and down relative to the lower die seat 710 through a driving source (not shown in the figure).

[0226] In addition, if Fig.34 As shown, in the fourth embodiment, the lower mold base 710 is penetrated by a lower mold air hole 710c connected to the lower mold mounting groove 710b, and the ring seat module 720 is penetrated by a lower mold through hole 720b and a lower mold side hole 720c, the lower mold through hole 720b connects the lower mold mounting groove 710b and the lower mold air hole 710c, and the lower mold side hole 720c connects the lower mold through hole 720b and the outer ring mold cavity area 710a1.

[0227] In other embodiments, the lower mold unit 700 can adjust its structure according to the foaming requirements. For example, the ring seat module 720 is not restricted in being able to move up and down relative to the lower mold base 710, as long as the ring seat module 720 is protruded in the mold cavity 710a of the lower mold base 710, and the setting of the lower mold driving base 730 is omitted accordingly; the lower mold base 710 can omit the setting of the lower mold air hole 710c, as long as the upper mold unit 600 has the upper mold air hole 610c.

[0228] When the upper mold base 610 and the lower mold base 710 are driven to close the mold, the annular groove 610b of the upper mold base 610 connects the outer ring mold cavity area 710a1 and the inner ring mold cavity area 710a2 of the lower mold base 710 to form the mold chamber space S4. More specifically, the upper mold driving base 630 of the upper mold unit 600 and the lower mold driving base 730 of the lower mold unit 700 independently drive the movable module 620 and the ring seat module 720 to move up and down, and the movable module 620 and the ring seat module 720 can be switched between an initial exhaust state T1, a mold closing and foaming state T2 and a mold opening state T3. When the movable module 620 and the ring seat module 720 are in the initial exhaust state T1 (refer to Fig.37 ), the upper mold side hole 620c of the movable module 620 and the lower mold side hole 720c of the ring seat module 720 are respectively opened to connect to the mold chamber space S4; when the movable module 620 and the ring seat module 720 are switched to the mold closing foaming state T2 (refer to Fig.38 ), the movable module 620 and the ring seat module 720 are driven to abut against each other, and the inner ring cavity area 710a2 inside the ring seat module 720 is closed by the movable module 620 to form a foaming space S5, at this time, the mold chamber space S4 surrounds the outer side of the movable module 620 and the ring seat module 720, and the foaming space S5 is not connected to the mold chamber space S4; when the movable module 620 and the ring seat module 720 are switched to the mold opening state T3 (refer to Fig.39 ), the movable module 620 and the ring seat module 720 are driven to open, wherein the movable module 620 rises and is received in the upper mold mounting groove 610a, and the ring seat module 720 descends to maintain the protrusion in the mold cavity 710a, so that the inner ring mold cavity area 710a2 inside the ring seat module 720 is opened, and the mold chamber space S4 is connected to the inner ring mold cavity area 710a2.

[0229] The vacuum unit 800 is connected to the upper mold air hole 610c of the upper mold unit 600 and the lower mold air hole 710c of the lower mold unit 700 by a pipeline. Fig.34 , Fig.37As shown, in actual operation, when the movable module 620 and the ring seat module 720 are in the initial vacuum state T1, the vacuum unit 800 is connected to the mold chamber space S4 through the upper mold air hole 610c of the upper mold base 610 and the lower mold air hole 710c of the lower mold base 710 for vacuum extraction. When the mold chamber space S4 reaches a preset vacuum state, the movable module 620 and the ring seat module 720 are switched to the mold closing foaming state T2, and the movable module 620 closes the inner ring mold cavity area 710a2 to form the foaming space S5, so that the polymer foaming raw material is located in the foaming space S5 for vacuum foaming.

[0230] See also Figures 35 to 40 As shown, the method for preparing a foamed molded body 900 using the aforementioned foaming mold device 500 in the fourth preferred embodiment of the present invention comprises the following steps:

[0231] Step C1, prepare the foaming mold device 500. Before the upper mold unit 600 and the lower mold unit 700 of the foaming mold device 500 are molded together, the polymer foaming raw material is pre-filled into the mold cavity 710a on the inner side of the lower mold unit 700. In the fourth embodiment, the polymer foaming raw material is also not granulated particles, but a liquid or powder material containing a thermoplastic foaming raw material and a foaming agent. The thermoplastic foaming raw material and the foaming agent are pre-mixed uniformly to form the polymer foaming raw material, and then the polymer foaming raw material is pre-filled into the inner ring mold cavity area 710a2 of the mold cavity 710a in a non-injection manner. The inner ring mold cavity area 710a2 is surrounded by the ring seat module 720, and the outer ring mold cavity area 710a1 of the mold cavity 710a surrounds the ring seat module 720.

[0232] Step C2: drive the upper mold unit 600 and the lower mold unit 700 to close the mold, and the mold chamber space S4 is formed between the mold core 620a inside the upper mold unit 600 and the mold cavity 710a of the lower mold unit 700, such as Fig.36 and Fig.37 As shown, in the fourth embodiment, the annular groove 610b of the upper mold unit 600 connects the outer ring mold cavity area 710a1 and the inner ring mold cavity area 710a2 of the lower mold unit 700 to form the mold chamber space S4. At this time, the movable module 620 and the ring seat module 720 are in the initial vacuum state T1, and the upper mold side hole 620c of the movable module 620 and the lower mold side hole 720c of the ring seat module 720 are respectively opened to connect to the mold chamber space S4, whereby the upper mold air hole 610c of the upper mold unit 600 and the lower mold air hole 710c of the lower mold unit 700 are respectively connected to the mold chamber space S4.

[0233] Step C3: Start the vacuum unit 800. Since the movable module 620 and the ring seat module 720 are in the initial vacuum state T1, the vacuum unit 800 vacuums the mold chamber space S4 by connecting the upper mold air hole 610c of the upper mold unit 600 and the lower mold air hole 710c of the lower mold unit 700.

[0234] Step C4, when the mold chamber space S4 reaches a preset vacuum state, Fig.36 and Fig.38 As shown, the movable module 620 and the ring seat module 720 are switched to the mold closing foaming state T2, so that the movable module 620 and the ring seat module 720 are close to each other, and the movable module 620 closes the inner ring mold cavity area 710a2 inside the ring seat module 720, that is, the movable module 620 and the ring seat module 720 are close to form the foaming space S5, at this time, the foaming space S5 is also in a vacuum state, and the upper mold unit 600 and the lower mold unit 700 are heated, so that the polymer foaming raw material is located in the foaming space for vacuum foaming to form a foaming molding 900, wherein the heating temperature of the upper mold unit 600 and the lower mold unit 700 is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C; Fig.36 and Fig.39 As shown, when the polymer foaming raw material foams to a certain extent in the foaming space S5, the movable module 620 and the ring seat module 720 can be controlled to switch to the mold opening state T3 to open the foaming space S5, so that the polymer foaming raw material expands evenly outward from the foaming space S5 to fill the mold chamber space S4, thereby forming the foaming molded body 900.

[0235] Step C5, such as Fig.40 As shown, the vacuum state of the mold chamber space S4 is released, and the upper mold unit 600 and the lower mold unit 700 are driven to open the mold to take out the foamed molded body 900. The foamed molded body 900 can then undergo subsequent maturation and shaping stages to stabilize the structural form of the foamed molded body 900.

[0236] See also Fig.41 , Fig.42The foamed molded body 900 is a shoe midsole configuration, and contains a plurality of fine closed bubbles (not shown) inside, wherein the foamed molded body 900 includes a shoe body 910, and the bottom side of the shoe body 910 is formed with an annular groove 911, an inner ring portion 912 and an outer ring portion 913, the annular groove 911 corresponds to the contour of the annular module 720, the inner ring portion 912 is located on the inner side of the annular groove and corresponds to the contour of the inner ring mold cavity area 710a2, and the outer ring portion 913 surrounds the outer side of the annular groove and corresponds to the contour of the outer ring mold cavity area 710a1.

[0237] The method for preparing the foamed molded body 900 by the aforementioned foaming mold device 500 also uses the polymer foaming raw material to fill the mold cavity 710a of the lower mold unit 700 for vacuum foaming, so as to save the mixing, granulation and injection steps in the existing foaming process, wherein the movable module 620 of the upper mold unit 600 and the annular module 720 of the lower mold unit 700 can independently control the displacement, and the upper mold unit 600 and the lower mold unit 700 respectively have pores for the vacuum unit 800 to connect, thereby the vacuum unit 800 vacuumizes the mold chamber space S4 inside the foaming mold device 500 The mold chamber space S4 and the foaming space S5 are maintained in a vacuum state, so that the polymer foaming raw material is vacuum foamed in the foaming space S5. When the polymer foaming raw material foams to a certain extent in the foaming space S5, the movable module 620 and the ring seat module 720 can be controlled to switch to the mold opening state T3 to open the foaming space S5, so that the polymer foaming raw material expands evenly outward from the foaming space S5 to fill the mold chamber space S4, providing the efficiency of one-time foaming to form the foaming molded body 900, thereby improving the foaming yield of the foaming molded body 900.

[0238] The above descriptions are only preferred feasible embodiments of the present invention. Any equivalent changes made by applying the description and claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A foaming mold device, comprising: An upper mold unit has a mold core on the inner side, and an air hole is passed through the upper mold unit; a lower mold unit, arranged opposite to the upper mold unit, the inner side of the lower mold unit having a mold cavity corresponding to the mold core for filling a polymer foaming material, when one or both of the upper mold unit and the lower mold unit are driven to close the mold, a mold chamber space is formed between the mold core and the mold cavity, and the air hole of the upper mold unit is connected to the mold chamber space; and A vacuum unit is connected to the air holes of the upper mold unit and vacuumizes the mold chamber space so that the polymer foaming material is vacuum foamed in the mold chamber space.

2. The foaming mold device as described in claim 1, wherein the lower mold unit includes a lower mold base, the inner side of the lower mold base is recessed with the mold cavity, the mold cavity is provided with a plurality of positioning grooves for placing a gasket, and the lower mold base is provided with a plurality of air flow ducts, the plurality of air flow ducts penetrate the mold cavity from the outside of the lower mold base corresponding to the plurality of positioning grooves, when each of the gaskets is placed in each of the positioning grooves, the plurality of gaskets respectively seal the openings of the plurality of air flow ducts in the plurality of positioning grooves, so that the air flow ducts of the lower mold base are not connected to the mold chamber space.

3. The foaming mold device as described in claim 2 further comprises an air supply unit connected to the multiple air flow ducts of the lower mold unit, and the air supply unit can switch to set a negative pressure mode and a positive pressure mode. When each of the gaskets is placed in each of the positioning grooves, the air supply unit sets the negative pressure mode to perform negative pressure suction on the multiple positioning grooves through the multiple air flow ducts, and each of the gaskets is adsorbed by the negative pressure of the air supply unit and is fixed in each of the positioning grooves to close the openings of the multiple air flow ducts. When the air supply unit switches to set the positive pressure mode, positive pressure is blown to the multiple positioning grooves through the multiple air flow ducts, and the multiple gaskets are pushed accordingly to detach from the multiple positioning grooves.

4. A foaming mold device as described in any one of claims 1 to 3, wherein the vacuum unit includes an exhaust guide rod that penetrates the upper mold unit through the air hole, and the exhaust guide rod has a hollow channel inside to connect to the mold chamber space, and one end of the exhaust guide rod is linked to a plug located on the inner side of the upper mold unit, and the exhaust guide rod is driven to switch between an exhaust position and a closed position relative to the upper mold unit. When the exhaust guide rod is located at the exhaust position, the hollow channel of the exhaust guide rod is connected to the mold chamber space for vacuum extraction, and when the exhaust guide rod is switched to the closed position, the plug of the exhaust guide rod seals the air hole so that the hollow channel of the exhaust guide rod is not connected to the mold chamber space.

5. A foaming mold device as described in claim 4, wherein the exhaust guide rod has a hollow tube and an exhaust joint, the hollow tube penetrates the upper mold unit along the air hole, the hollow tube has the hollow passage inside, the hollow tube has a first end located outside the upper mold unit, the exhaust joint is sleeved on the first end, the hollow tube has a second end passing through the inner side of the upper mold unit, the plug is connected to the hollow tube by closing the port of the second end, and the circumferential surface of the second end is penetrated by a radial hole connected to the hollow passage.

6. A foaming mold device as described in claim 5, wherein the upper mold unit includes an upper mold base, the mold core is formed on the inner side of the upper mold base, the air hole penetrates the mold core longitudinally from the upper mold base, and the mold core is located at one end of the air hole and is recessed with a receiving groove corresponding to the plug portion, when the exhaust guide rod is driven to be located in the closed position, the plug portion is received in the receiving groove to close the air hole, and the radial hole of the hollow tube is hidden in the air hole.

7. A foaming mold device as described in claim 5, wherein the vacuum unit includes an elastic member sleeved on the exhaust guide rod, the hollow tube has a fixed ring located outside the upper mold unit, the elastic member surrounds the circumference of the hollow tube, and both ends of the elastic member elastically press against the fixed ring and the outer side of the upper mold unit, so that the exhaust guide rod is pressed by the elastic member and is normally located in the closed position.

8. A foaming mold device as described in any one of claims 1 to 3, wherein the upper mold unit includes an upper mold base and a movable module, an upper mold mounting groove is recessed on the inner side of the upper mold base, the upper mold base is penetrated by the air hole, the upper mold mounting groove has a side hole connected to the air hole, the movable module is arranged in the upper mold mounting groove, and the mold core is formed on the outer side of the movable module, the movable module is driven to move relative to the upper mold base and movably opens or closes the side hole.

9. The foaming mold device as claimed in claim 8, wherein the upper mold unit includes an actuating member, the actuating member is located outside the upper mold base and connected to the movable module, the movable module is convexly provided with at least one follower block on the inner side opposite to the mold core, the follower block penetrates the upper mold mounting groove and extends out of the upper mold base, the actuating member is connected to the follower block and drives the movable module to switch between an exhaust position and a closed position, when the upper mold base and the lower mold base are driven to close the mold, the upper mold mounting groove is connected to the mold cavity to form the mold chamber space, and the movable module is in the exhaust position, the movable module opens the side hole, and the vacuum unit is connected to the mold chamber space through the air hole of the upper mold base for vacuum extraction, when the movable module is driven to switch to the closed position, the movable module is tightly fitted with the mold cavity and closes the side hole to form a foaming space, so that the polymer foaming raw material is located in the foaming space for vacuum foaming.

10. The foaming mold device as claimed in claim 9, wherein the actuator includes a driving base and a rotating switch, the driving base is locked to the driven block of the movable module, one side of the driving base has a pulling protrusion, the rotating switch can be rotatably arranged on the outside of the upper mold base, and the rotating switch is adjacent to the pulling protrusion of the driving base, the rotating switch defines a rotating axis, and the rotating switch is provided with a first handle and a second handle around the rotating axis, the first handle is driven to rotate to press against the bottom of the pulling protrusion, the pulling protrusion is pressed by the first handle to link the driving base and the movable module to the exhaust position, the second handle is driven to rotate to press against the top of the pulling protrusion, the pulling protrusion is pressed by the second handle to link the driving base and the movable module to the closed position.

11. The foaming mold device as described in claim 1, wherein the upper mold unit includes an upper mold base and a movable module, an upper mold mounting groove is recessed on the inner side of the upper mold base, and an annular groove surrounds the upper mold mounting groove, the upper mold base is penetrated by an upper mold air hole connected to the upper mold mounting groove, the movable module is installed in the upper mold mounting groove, and the mold core is formed on the outer side of the movable module, wherein the movable module is penetrated by an upper mold through hole and an upper mold side hole, the upper mold through hole connects the upper mold mounting groove and the upper mold air hole, and the upper mold side hole connects the upper mold through hole and the annular groove, wherein the movable module is driven to move relative to the upper mold seat in the upper mold mounting groove.

12. A foaming mold device as described in claim 11, wherein at least one upper mold follower block is convexly provided on the inner side of the movable module to penetrate the upper mold mounting groove and extend out of the upper mold seat, and the upper mold unit includes an upper mold driving base, which is connected to the upper mold follower block and drives the movable module to move up and down.

13. The foaming mold device as claimed in claim 11, wherein the lower mold unit comprises a lower mold base and a ring base module, the mold cavity is recessed on the inner side of the lower mold base, the mold cavity is convexly provided on the ring base module, and the mold cavity is divided into an outer ring mold cavity area and an inner ring mold cavity area relative to the ring base module area, the outer ring mold cavity area surrounds the ring base module, the inner ring mold cavity area is surrounded by the ring base module and is located on the inner side of the ring base module for accommodating the polymer foaming raw material, wherein when the upper mold base is aligned with the When the lower mold base is driven to close the mold, the annular groove of the upper mold base connects the outer ring mold cavity area and the inner ring mold cavity area of ​​the lower mold base to form the mold chamber space, and the vacuum unit vacuums the mold chamber space through the upper mold air hole of the upper mold base to connect to the upper mold through hole of the movable module. When the movable module is driven to close the annular seat module, the movable module closes the inner ring mold cavity area to form a foaming space, so that the polymer foaming raw material is located in the foaming space for vacuum foaming.

14. A foaming mold device as described in claim 13, wherein the inner side of the lower mold base is recessed into a lower mold mounting groove from the bottom of the mold cavity groove, the lower mold mounting groove is located between the outer ring mold cavity area and the inner ring mold cavity area, the ring seat module is movably installed in the lower mold mounting groove, the ring seat module has at least one lower mold follower block that penetrates the lower mold mounting groove and extends out of the lower mold base, the lower mold unit includes a lower mold driving base, the lower mold driving base is connected to the lower mold follower block and drives the ring seat module to move up and down relative to the lower mold base.

15. A foaming mold device as described in claim 14, wherein the lower mold seat is penetrated by a lower mold air hole connected to the lower mold mounting groove to connect the vacuum unit, and the ring seat module is penetrated by a lower mold through hole and a lower mold side hole, the lower mold through hole connects the lower mold mounting groove and the lower mold air hole, and the lower mold side hole connects the lower mold through hole and the outer ring mold cavity area.

16. The foaming mold device as claimed in claim 15, wherein the upper mold driving base and the lower mold driving base independently drive the movable module and the ring seat module to move, and the movable module and the ring seat module can be switched between an initial vacuum state, a mold closing foaming state and a mold opening state. When the movable module and the ring seat module are in the initial vacuum state, the vacuum unit connects the upper mold unit and the lower mold unit to vacuum the mold chamber space. When the movable module and the ring seat module are switched to the mold closing foaming state, the movable module and the ring seat module are driven to abut against each other, and the inner ring mold cavity area on the inner side of the ring seat module is closed by the movable module to form the foaming space. When the movable module and the ring seat module are switched to the mold opening state, the movable module is driven to be received into the upper mold mounting groove, and the ring seat module is driven to descend and maintain the protrusion in the mold cavity.

17. A method for preparing a foamed molded article, comprising the following steps: A foaming mold device is prepared, and before an upper mold unit and a lower mold unit of the foaming mold device are molded together, a polymer foaming raw material is pre-filled into a mold cavity inside the lower mold unit; The upper mold unit and the lower mold unit are driven to close the mold, a mold chamber space is formed between a mold core inside the upper mold unit and a mold cavity of the lower mold unit, and an air hole of the upper mold unit is connected to the mold chamber space; Starting a vacuum unit, wherein the vacuum unit vacuumizes the mold chamber space through the air hole connected to the upper mold unit; When the mold chamber space reaches a preset vacuum state, heating the upper mold unit and the lower mold unit so that the polymer foaming material is heated and foamed in the mold chamber space to form a foamed molded body; and The vacuum state of the mold chamber space is released, and the upper mold unit and the lower mold unit are driven to open the mold to take out the foamed molded body.

18. A method for preparing a foamed molded body as described in claim 17, wherein the polymer foaming raw material is a liquid or powder material comprising a thermoplastic foaming raw material and a foaming agent, the thermoplastic foaming raw material and the foaming agent are uniformly mixed in advance to form the polymer foaming raw material, and then the polymer foaming raw material is filled into the mold cavity on the inner side of the lower mold unit, wherein the thermoplastic foaming raw material comprises a reaction raw material of one of ethylene-vinyl acetate copolymer, synthetic rubber and thermoplastic elastomer.

19. The method for preparing a foamed molded body as described in claim 18, wherein a gasket is pre-placed in each of the multiple installation grooves in the mold cavity, and then the polymer foaming raw material is filled into the mold cavity to cover the multiple gaskets, wherein a lower mold base of the lower mold unit is connected to an air supply unit, and the air supply unit sets a negative pressure mode to perform negative pressure suction on the multiple positioning grooves through multiple air flow ducts inside the lower mold base, and each of the gaskets is adsorbed by the negative pressure of the air supply unit and is fixed in each of the positioning grooves to close the openings of the multiple air flow ducts.

20. The method for preparing a foamed molded body as described in claim 19, wherein when the upper mold unit and the lower mold unit are opened, the foamed molded body and the multiple gaskets are combined together due to foaming and hot melting, and the air supply unit is switched to a positive pressure mode, and the air supply unit blows positive pressure to the multiple positioning grooves through the multiple air flow ducts, so as to blow positive pressure to the multiple positioning grooves through the multiple air flow ducts and push the multiple gaskets accordingly, so that the foamed molded body is separated from the mold cavity by the air pressure thrust of the air supply unit.

21. The method for preparing a foamed molded body as described in any one of claims 17 to 20, wherein a vacuum guide rod of the vacuum unit is connected to the mold chamber space through the air hole, the vacuum guide rod is driven to a vacuum position, so that a hollow channel inside the vacuum guide rod is connected to the mold chamber space, and the vacuum unit vacuums the mold chamber space through the vacuum guide rod.

22. A method for preparing a foamed molded body as described in claim 21, wherein when the mold chamber space reaches a preset vacuum state, the vacuum guide rod is driven to switch to a closed position, and a plug portion of the vacuum guide rod seals the air hole, so that the hollow channel of the vacuum guide rod is not connected to the mold chamber space, so that the polymer foaming raw material is located in the mold chamber space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

23. The method for preparing a foamed molded body as described in any one of claims 17 to 20, wherein when the upper mold unit and the lower mold unit are molded together, a movable module of the upper mold unit can be driven by an actuator and is pre-placed in a vacuum position in an upper mold mounting groove on the inner side of an upper mold base, the movable module opens a side hole of the upper mold base to connect the air hole and the mold chamber space, and the vacuum unit is connected to the mold chamber space through the air hole of the upper mold base for vacuuming.

24. A method for preparing a foamed molded body as described in claim 23, wherein when the mold chamber space reaches a preset vacuum state, the movable module is driven by the actuator to switch to a closed position, so that the movable module is tightly fitted into the mold cavity and the side hole is closed, and a foaming space is formed between the movable module and the mold cavity, so that the polymer foaming raw material is located in the foaming space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

25. The method for preparing a foamed molded body as described in any one of claims 17 or 18, wherein the polymer foaming raw material is pre-filled into an inner ring mold cavity area of ​​the mold cavity, the inner ring mold cavity area is surrounded by the ring seat module, and an outer ring mold cavity area of ​​the mold cavity surrounds the ring seat module.

26. A method for preparing a foamed molded body as described in claim 25, wherein when the upper mold unit and the lower mold unit are molded together, a movable module of the upper mold unit can be actuated by an upper mold driving base and movablely displaced in an upper mold mounting groove on the inner side of an upper mold base, an upper mold through hole and an upper mold side hole of the movable module are respectively connected to an upper mold air hole and an annular groove of the upper mold base, and the annular groove connects the outer ring mold cavity area and the inner ring mold cavity area to form the mold chamber space, and the vacuum unit vacuums the mold chamber space through the upper mold air hole of the upper mold base to connect to the upper mold through hole of the movable module.

27. A method for preparing a foamed molded body as described in claim 26, wherein when the mold chamber space reaches a preset vacuum state, the movable module is driven to engage with the ring seat module, the movable module closes the inner ring mold cavity area, and a foaming space is formed between the movable module and the ring seat module, so that the polymer foaming raw material is located in the foaming space for vacuum foaming, wherein the heating temperature of the upper mold unit and the lower mold unit is the foaming reaction temperature of the polymer foaming raw material, which is between 130°C and 240°C.

28. A method for preparing a foamed molded body as described in claim 27, wherein the ring seat module can be actuated by a lower mold driving base and movably installed in a lower mold mounting groove on the inner side of a lower mold seat, the lower mold mounting groove is recessed from the bottom of the mold cavity groove and is located between the outer ring mold cavity area and the inner ring mold cavity area, and the lower mold through hole and the lower mold side hole inside the ring seat module are respectively connected to the lower mold air hole of the lower mold seat and the outer ring mold cavity area.

29. The method for preparing a foamed molded body as described in claim 28, wherein the upper mold driving base and the lower mold driving base independently drive the movable module and the ring seat module to move, and the movable module and the ring seat module can be switched between an initial vacuum state, a mold closing foaming state and a mold opening state. When the movable module and the ring seat module are in the initial vacuum state, the vacuum unit connects the upper mold unit and the lower mold unit to vacuum the mold chamber space. When the movable module and the ring seat module are switched to the mold closing foaming state, the movable module and the ring seat module are driven to abut against each other, and the inner ring mold cavity area on the inner side of the ring seat module is closed by the movable module to form the foaming space. When the movable module and the ring seat module are switched to the mold opening state, the movable module is driven to be received in the upper mold mounting groove, and the ring seat module is driven to descend and maintain the protrusion in the mold cavity.

30. A foamed molded body obtained by the method for preparing a foamed molded body according to claim 17, wherein the foamed molded body contains a plurality of closed cells.

31. The foamed molded body as described in claim 30, wherein the foamed molded body is a shoe midsole configuration, the foamed molded body comprises a shoe body, a plurality of gaskets are combined with the bottom side of the shoe body, and the plurality of gaskets are combined with the shoe body by hot melt.

32. A foamed molded body as described in claim 30, wherein the foamed molded body is a shoe midsole configuration, the foamed molded body comprises a shoe body, the bottom side of the shoe body is formed with a ring groove, an inner ring portion is located on the inner side of the ring groove, and an outer ring portion surrounds the outer side of the ring groove.

33. The foaming molded body as described in claim 30, wherein the foaming molded body is a flat plate configuration, the foaming molded body comprises a plate body, a plurality of gaskets are combined with one side of the plate body, and the plurality of gaskets are combined with the plate body by hot melt.

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