Injection molding EVA foaming mold capable of preventing clamping during demolding

Abstract

The utility model discloses an injection molding EVA (Ethylene Vinyl Acetate) foaming mould capable of preventing clamping during demoulding, which comprises a bottom mould, a top mould and a mould core, at least one plastic product forming cavity is arranged between the bottom mould and the top mould, a concave part is arranged on the bottom mould, a convex part is arranged on the top mould, and the concave part of the bottom mould is matched with the convex part of the top mould. The bottom die is connected with the fixing groove of the top die through a fixing rod to form a set of plastic product die, an exhaust channel, a feeding channel and a bottom die groove used for forming a plastic product structure are formed in the upper surface of the bottom die, and an exhaust hole communicated with the exhaust channel and a material blocking hole communicated with the feeding channel are further formed in the top die. According to the plastic product mold, the blowing device is arranged on the bottom mold groove, high-pressure gas is controlled to blow into the bottom mold groove through the blowing device, so that a plastic product is easily separated from the bottom mold groove, the mold opening speed is high, the mold opening speed is high, the mold opening efficiency is high, the mold opening cost is low, and the production cost is low. And the produced plastic products are low in defective rate.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to an injection EVA foaming mold for preventing jamming during demolding. Background Technology

[0002] Molds give plastic products a complete structure and precise dimensions, mainly by changing the physical state of the material being molded to achieve the shaping of the item. Injection molding of EVA foam involves injecting molten plastic into an injection cavity, where it cools and solidifies to obtain the finished plastic part. However, existing injection molding of EVA foam suffers from slow mold opening speeds, a tendency to jam, and a high rate of defective products. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide an injection EVA foaming mold with anti-jamming and demolding function. The injection EVA foaming mold has a simple structure, novel design, fast mold opening speed, strong stability, avoids product defects, and reduces the defect rate.

[0004] This utility model is achieved through the following technical solution: a demolding and anti-jamming injection EVA foam mold, including a bottom mold, a top mold, and a mold core. At least one plastic product molding cavity is provided between the bottom mold and the top mold. A concave part is provided on the bottom mold, and a convex part is provided on the top mold. The concave part of the bottom mold and the convex part of the top mold cooperate with each other. The bottom mold and the top mold are connected by a fixing rod and a fixing groove to form a plastic product mold. An exhaust channel, a feeding channel, and a bottom mold groove for molding the structure of the plastic product are provided on the upper surface of the bottom mold. An exhaust hole communicating with the exhaust channel and a blocking hole communicating with the feeding channel are also provided on the top mold. An outlet hole communicating with the feeding channel is provided in the bottom mold groove. At least one air blowing device for blowing air into the bottom mold groove is provided at the bottom of the bottom mold groove.

[0005] Preferably, the bottom mold of this utility model is provided with a mounting hole located in the bottom mold groove, the mounting hole penetrating the upper and lower surfaces of the bottom mold, and the air blowing device is embedded in the mounting hole.

[0006] Preferably, the bottom surface of the bottom mold of this utility model is provided with a bottom plate fixedly connected thereto, an air inlet cavity is provided between the upper surface of the bottom plate and the lower surface of the bottom mold, a sealing ring is provided between the bottom plate and the bottom mold located at the outer edge of the air inlet cavity, and an air inlet hole communicating with the air inlet cavity is provided on the bottom plate.

[0007] Preferably, the base plate of this utility model is provided with a sealing ring positioning groove for positioning the sealing ring.

[0008] Preferably, the bottom plate of this invention has an air inlet groove on the side facing the lower surface of the bottom mold, the air inlet groove is connected to the air inlet hole, and the air inlet groove is provided with an air delivery groove corresponding to the position of the mounting hole.

[0009] Preferably, the air blowing device of this utility model includes a hollow shell, with an air inlet at one end and an air outlet at the other end. A sealing valve for controlling the gas flow between the air inlet and the air outlet is provided inside the hollow shell.

[0010] Preferably, the sealing valve of this utility model includes a push rod, one end of which is provided with a plug for opening or closing the air outlet, and the other end of which is provided with a limiting rod. The hollow shell has slots on both sides for the limiting rod to slide, and the two ends of the slots are arranged axially. The inner wall of the hollow shell is provided with a protruding limiting ring. The bottom of the plug abuts against the upper surface of the limiting ring. A return spring is sleeved on the push rod, one end of which abuts against the lower surface of the limiting ring, and the other end of which abuts against the limiting rod.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0012] 1. This utility model is equipped with an air blowing device on the bottom mold groove. The air blowing device controls high-pressure gas to blow into the bottom mold groove, so that the plastic product can be easily separated from the bottom mold groove, resulting in fast mold opening speed, less mold jamming, and low defect rate of produced plastic products.

[0013] 2. The air blowing device of this utility model utilizes the deformation state of the return spring to allow the sealing valve to control the gas flow between the air inlet and the air outlet. When mold removal is required, high-pressure gas is sent to the air inlet chamber, which compresses the return spring to open the outlet, allowing high-pressure gas to be blown from the outlet into the bottom mold groove. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the upper surface of the bottom mold of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the lower surface of the bottom mold of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the lower surface of the top mold of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the upper surface of the base plate of this utility model;

[0020] Figure 6This is a schematic diagram of the structure of the novel air blowing device.

[0021] Figure 7 for Figure 6 A schematic diagram of the AA-direction cross-section;

[0022] The reference numerals used in the above figures are explained as follows:

[0023] 1—Bottom mold, 10—Recess, 11—Fixing rod, 12—Exhaust channel, 13—Feed channel, 14—Bottom mold groove, 15—Mounting hole, 130—Feed hole, 131—Blocking component, 140—Discharge hole;

[0024] 2—Top mold, 20—Protrusion, 21—Fixing groove, 22—Ventilation hole, 23—Blocking hole;

[0025] 3—Blowing device, 30—Hollow shell, 31—Air inlet, 32—Air outlet, 33—Sealing valve, 34—Push rod, 35—Plug, 36—Limiting rod, 37—Slot, 38—Limiting ring, 39—Reset spring;

[0026] 4—Base plate, 40—Air inlet, 41—Air inlet slot, 42—Air delivery slot;

[0027] 5—Intake chamber;

[0028] 6—Sealing ring, 60—Sealing ring positioning groove;

[0029] 7—Mold core. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Reference Figures 1 to 7 As shown, an injection molding EVA foam mold for preventing mold jamming includes a bottom mold 1, a top mold 2, and a mold core 7. The mold core 7 is formed on the lower surface of the top mold 2. At least one plastic product molding cavity is provided between the bottom mold 1 and the top mold 2. A recess 10 is provided on the bottom mold 1, and a protrusion 20 is provided on the top mold 2. The recess 10 of the bottom mold 1 and the protrusion 20 of the top mold 2 are matched. The bottom mold 1 and the top mold 2 are connected by a fixing rod 11 and a fixing groove 21 to form a plastic product mold. An exhaust channel 12, a feeding channel 13, and a bottom mold groove 14 for molding the structure of the plastic product are provided on the upper surface of the bottom mold 1. An exhaust hole 22 communicating with the exhaust channel 12 and a blocking hole 23 communicating with the feeding channel 13 are also provided on the top mold 2. An outlet hole 140 communicating with the feeding channel 13 is provided in the bottom mold groove 14. At least one air blowing device 3 for blowing air into the bottom mold groove 14 is provided at the bottom of the bottom mold groove 14.

[0034] When the plastic product is a shoe sole or a one-piece slipper, the bottom mold 1 and the top mold 2 are provided with two plastic product molding cavities. Simultaneously, two mold cores 7 are provided on the lower surface of the top mold 2, corresponding to the two bottom mold grooves 14 on the bottom mold. This allows for the molding of one pair of slippers or shoe soles at a time, improving production efficiency. Alternatively, there can be four plastic product molding cavities, allowing for the molding of two pairs of slippers or shoe soles at once. In this case, the number of plastic product molding cavities is the same as the number of mold cores 7 and bottom mold grooves 14.

[0035] In order to allow the injection plastic to enter the bottom mold groove 14 through the feeding channel, at least one feeding hole 130 communicating with the discharge hole 140 is provided on the feeding channel 13. There can be multiple feeding holes 130. The speed of material discharge in the bottom mold groove 14 can be controlled by multiple feeding holes 130. Specifically, a removable plug 131 is provided in the feeding hole 130. When slow feeding is required, the plug 131 is used to block other feeding holes 130, and at least one feeding hole 130 is not equipped with a plug 131.

[0036] In order for the air blowing device to blow air into the bottom mold groove 14, the bottom mold 1 is provided with a mounting hole 15 located in the bottom mold groove 14. The mounting hole 15 penetrates the upper and lower surfaces of the bottom mold 1, and the air blowing device 3 is embedded in the mounting hole 15.

[0037] In this preferred embodiment, two air blowing devices are provided at the bottom of the bottom mold groove 14. The two air blowing devices are arranged at both ends of the bottom mold groove, and each air blowing device is installed in the mounting hole 15. This not only prevents the mold from getting stuck, but also allows for quick demolding.

[0038] Specifically, the air blowing device 3 includes a hollow shell 30, with an air inlet 31 at one end and an air outlet 32 ​​at the other end. Inside the hollow shell 30, there is a sealing valve 33 for controlling the flow of gas between the air inlet 31 and the air outlet 32. The sealing valve 33 includes a push rod 34, with a plug 35 at one end for opening or closing the air outlet and a limiting rod 36 at the other end. On both sides of the hollow shell 30, there are slots 37 for the limiting rod to slide, with both ends of the slots 37 axially arranged. The inner wall of the hollow shell 30 has a protruding limiting ring 38. The bottom of the plug 35 abuts against the upper surface of the limiting ring 38. A return spring 39 is sleeved on the push rod 34, with one end of the return spring abutting against the lower surface of the limiting ring 38 and the other end abutting against the limiting rod 36.

[0039] With this configuration, when high-pressure gas enters through the air inlet 31 of the hollow shell 30, the sealing valve 33 is pressurized by the high-pressure gas, and the compression return spring 39 is pushed upward, causing the plug 35 to open the air outlet. The high-pressure gas will then enter the bottom mold groove 14, thereby solving the problem of demolding jamming, preventing plastic products from jamming and deforming, which would easily lead to product defects, high defect rate, serious product scrapping, and increased production costs for enterprises.

[0040] In order to enable high-pressure gas to blow air into the air blowing device 3, a base plate 4 is fixedly connected to the lower surface of the bottom mold 1. An air inlet cavity 5 is provided between the upper surface of the base plate 4 and the lower surface of the bottom mold 1. A sealing ring 6 is provided between the base plate 4 and the bottom mold 1 at the outer edge of the air inlet cavity 5. An air inlet hole 40 is provided on the base plate 4 to communicate with the air inlet cavity 5. When the high-pressure gas from the outside enters the air inlet cavity 5 through the air inlet hole 40, the air inlet cavity 5 is connected to the air inlet 31 of the air blowing device 3, so that the high-pressure gas is blown into the bottom mold groove 14 through the air blowing device. This facilitates demolding and prevents the mold from getting stuck.

[0041] It should be noted that a sealing ring positioning groove 60 is provided on the base plate 4 for positioning the sealing ring 6, thereby preventing gas leakage.

[0042] It should also be noted that an air inlet groove 41 is provided on the side of the base plate 4 facing the lower surface of the bottom mold. The air inlet groove 41 is connected to the air inlet hole 40. The air inlet groove 41 is provided with an air delivery groove 42 corresponding to the position of the mounting hole 3. The number of air delivery grooves 42 is the same as that of the mounting hole 15, so that the high-pressure gas can be aligned with the position of the mounting hole. As the air pressure in the air inlet chamber 5 increases, the air blowing device blows gas into the bottom mold groove.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A molded EVA foam mold for preventing jamming during demolding, comprising a bottom mold (1), a top mold (2), and a mold core (7), wherein at least one plastic product molding cavity is provided between the bottom mold (1) and the top mold (2), a recess (10) is provided on the bottom mold (1), and a protrusion (20) is provided on the top mold (2), the recess (10) of the bottom mold (1) and the protrusion (20) of the top mold (2) cooperate with each other, the bottom mold (1) and the top mold (2) are connected by a fixing rod (11) and a fixing groove (21) to form a set of plastic product molds, the upper surface of the bottom mold (1) is provided with an exhaust channel (12), a feeding channel (13), and a bottom mold groove (14) for molding the structure of the plastic product, the top mold (2) is also provided with an exhaust hole (22) communicating with the exhaust channel (12) and a plugging hole (23) communicating with the feeding channel (13), and the bottom mold groove (14) is provided with an outlet hole (140) communicating with the feeding channel (13), characterized in that: The bottom of the bottom mold groove (14) is provided with at least one air blowing device (3) for blowing air into the bottom mold groove (14).

2. The injection molding EVA foam mold for anti-jamming and demolding as described in claim 1, characterized in that: The bottom mold (1) is provided with an installation hole (15) located in the bottom mold groove (14). The installation hole (15) penetrates the upper and lower surfaces of the bottom mold (1). The air blowing device (3) is embedded in the installation hole (15).

3. A demolding and anti-jamming injection mold for EVA foaming according to claim 1 or 2, characterized in that: The bottom mold (1) has a bottom plate (4) fixedly connected to it on its lower surface. An air inlet cavity (5) is provided between the upper surface of the bottom plate (4) and the lower surface of the bottom mold. A sealing ring (6) located on the outer edge of the air inlet cavity (5) is provided between the bottom plate (4) and the bottom mold (1). An air inlet hole (40) communicating with the air inlet cavity (5) is provided on the bottom plate (4).

4. The injection molding EVA foam mold for anti-jamming and demolding as described in claim 3, characterized in that: The base plate (4) is provided with a sealing ring positioning groove (60) for positioning the sealing ring (6).

5. The injection molding EVA foam mold for anti-jamming and demolding as described in claim 4, characterized in that: The bottom plate (4) has an air inlet groove (41) on the side facing the lower surface of the bottom mold. The air inlet groove (41) is connected to the air inlet hole (40). The air inlet groove (41) has an air delivery groove (42) corresponding to the position of the mounting hole (15).

6. The injection molding EVA foam mold for anti-jamming and demolding as described in claim 5, characterized in that: The air blowing device (3) includes a hollow shell (30), with an air inlet (31) at one end and an air outlet (32) at the other end. A sealing valve (33) is provided inside the hollow shell (30) to control the gas flow between the air inlet (31) and the air outlet (32).

7. The injection molding EVA foam mold for anti-jamming and demolding as described in claim 6, characterized in that: The sealing valve (33) includes a push rod (34), one end of which is provided with a plug (35) for opening or closing the air outlet, and the other end of which is provided with a limiting rod (36). The hollow housing (30) has slots (37) on both sides for the limiting rod to slide. The two ends of the slots (37) are arranged axially. The inner wall of the hollow housing (30) is provided with a protruding limiting ring (38). The bottom of the plug (35) abuts against the upper surface of the limiting ring (38). A return spring (39) is sleeved on the push rod (34). One end of the return spring (39) abuts against the lower surface of the limiting ring (38), and the other end of the return spring (39) abuts against the limiting rod (36).

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