Injection mold capable of preventing product from deforming

Abstract

The utility model discloses an injection mold capable of preventing a product from deforming. The injection mold comprises a fixing structure, a forming structure arranged in the middle of the fixing structure, and an ejection structure arranged on one side of the forming structure, the forming structure comprises a circular cavity group; an ejection hole and an injection molding hole are formed in the circular cavity group; the ejection holes are uniformly formed in the circumference of the circular cavity group, and the injection molding holes are formed in the middle position of the circular cavity group; the ejection structure comprises a spring set, a plurality of ejection shafts fixedly connected with the spring set and a limiting shaft fixedly connected with the spring set. The limiting shaft is only in contact with the fixing mechanism and used for compressing the spring set. The fixing structure comprises a fixing plate set, a feeding port formed in the middle of the fixing plate set and a fixing cavity formed in the middle of the fixing plate set. And the forming structures are fixedly connected in the fixing cavity, so that the ejection force applied by the spring is enhanced, and the condition that the product is completely adhered to the concave mold cavity and cannot fall off is avoided.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an injection mold for preventing a product from being deformed. Background Art

[0002] An injection mold is a precision tool used to produce plastic products. It heats and pressurizes the plastic melt to inject it into the mold cavity, and after cooling and solidification, it forms a product of the desired shape. An injection mold usually consists of a mold base, a mold core, a mold cavity, a cooling system, a discharge system, etc. Each part has a specific function to ensure the smooth progress of the injection molding process.

[0003] However, in the existing device, if the utility model patent 202321120120.6 is an injection mold, including a lower mold and an upper mold, a first heating tube is provided in the lower mold, which is used to generate heat when power is turned on to heat or keep the lower mold warm; the upper mold is arranged above the lower mold, which is used to enclose the lower mold to form a cavity, and a second heating tube is provided in the upper mold, which is used to generate heat when power is turned on to heat or keep the upper mold warm. In the prior art, for thinner products with a thickness of less than or equal to two millimeters, during the injection molding ejection process, ejection is only performed from one position, which causes deformation of the product.

[0004] Therefore, it is necessary to improve an injection mold in the prior art that prevents product deformation to solve the above problems. Summary of the invention

[0005] The utility model overcomes the shortcomings of the prior art, provides an injection mold which prevents a product from being deformed, and aims to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an injection mold for preventing product deformation, comprising: a fixing structure, a molding structure arranged in the middle of the fixing structure, and an ejection structure arranged on one side of the molding structure;

[0007] The molding structure includes: a circular cavity group; the circular cavity group is provided with ejection holes and injection holes; the ejection holes are evenly arranged on the circumference of the circular cavity group, and the injection holes are arranged at the middle position of the circular cavity group;

[0008] The ejection structure includes: a spring group, a plurality of ejection shafts fixedly connected to the spring group, and a limiting shaft fixedly connected to the spring group; the limiting shaft is only in contact with the fixed structure to compress the spring group;

[0009] The fixed structure comprises: a fixed plate group, a feed port opened in the middle of the fixed plate group, and a fixed cavity opened in the middle of the fixed plate group; the molding structures are fixedly connected in the fixed cavity.

[0010] In a preferred embodiment of the utility model, the circular cavity group includes a concave mold cavity and a convex mold cavity matched with the concave mold cavity.

[0011] In a preferred embodiment of the utility model, the concave mold cavity and the convex mold cavity are used to form a complete and closed cavity, and the injection hole is opened at the middle position of the concave mold cavity.

[0012] In a preferred embodiment of the utility model, the spring assembly includes a circular groove body and a plurality of springs arranged in the circular groove body; the plurality of springs are arranged in a nested manner, and the springs have the same length.

[0013] In a preferred embodiment of the utility model, the ejector shaft and the ejector hole can be transitionally matched, and the ejector shaft is used to eject the formed product.

[0014] In a preferred embodiment of the utility model, the fixing plate group includes an upper fixing plate and a lower fixing plate; the fixing cavity includes an upper fixing cavity and a lower fixing cavity, the upper fixing cavity is opened on the upper fixing plate, and the lower fixing cavity is opened on the lower fixing plate.

[0015] In a preferred embodiment of the present invention, the center of the feed port and the center of the injection hole are located on the same axis and are in a connected state.

[0016] In a preferred embodiment of the utility model, the concave model cavity is fixedly connected to the upper fixed cavity, and the convex model cavity is fixedly connected to the lower fixed cavity.

[0017] In a preferred embodiment of the utility model, a plurality of alignment shafts are evenly fixedly connected on the periphery of the lower fixing plate, a plurality of alignment holes are evenly opened on the periphery of the upper fixing plate, and the alignment shafts are slidably connected with the alignment holes.

[0018] The utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0019] (1) The utility model provides an injection mold for preventing deformation of a product. The ejection shaft, a plurality of springs and a circular groove body cooperate with each other. The hydraulic cylinder behind the upper fixed plate contracts to generate a pulling force to separate the upper fixed plate from the lower fixed plate. At the same time, the plurality of springs simultaneously restore their deformation, thereby generating a thrust to push out the product stuck on the concave mold cavity. Compared with the prior art, the device nests a plurality of springs together in a nested manner, thereby enhancing the ejection force applied by the spring without changing the required area of ​​the original mold ejection structure, thereby avoiding the situation where the product is completely stuck on the concave mold cavity and cannot fall off.

[0020] (2) The utility model provides an injection mold for preventing product deformation. The ejection shaft, a plurality of springs and a circular groove body cooperate with each other. The hydraulic cylinder behind the upper fixed plate contracts to generate a pulling force to separate the upper fixed plate from the lower fixed plate. At the same time, the plurality of springs recover their deformations at the same time, thereby generating a thrust to push out the product stuck to the concave mold cavity. Compared with the prior art, the device evenly nests a plurality of springs in the circular groove body so that the force for ejecting the product generated by the springs recovering their deformations completely acts on the circular groove body, is transmitted to the ejection shaft through the circular groove body, and then is ejected by the plurality of ejection shafts. This effectively avoids the situation in which, when ejecting thinner products, product deformation is caused by uneven force on the product caused by ejection of ejection shafts at multiple points or ejection at a single point. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0022] Figure 1 It is a three-dimensional structural diagram of a preferred embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the overall structure split structure of the preferred embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the concave mold cavity closing the convex mold cavity in the preferred embodiment of the utility model;

[0025] In the figure:

[0026] 1. Fixed structure; 10. Upper fixed plate; 11. Lower fixed plate; 12. Alignment axis; 13. Feed port;

[0027] 2. Molding structure; 20. Concave mold cavity; 21. Convex mold cavity;

[0028] 3. Ejector structure; 30. Spring assembly; 31. Ejector shaft; 32. Limiting shaft. DETAILED DESCRIPTION

[0029] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0030] As shown in the figure, an injection mold for preventing a product from being deformed comprises: a fixing structure 1, a molding structure 2 arranged in the middle of the fixing structure 1, and an ejection structure 3 arranged on one side of the molding structure 2;

[0031] It should be noted that the molding structure 2 and the ejection structure 3 are both arranged on the inner side of the fixed structure. The fixed structure 1 is divided into two parts and is arranged in an openable and closable state. The molding structure 2 is also divided into two parts and is arranged on the inner side of the fixed structure 1. The opening and closing of the fixed structure 1 drives the opening and closing of the molding structure 2. When the fixed structure 1 is closed, it drives the molding structure 2 to close, so that the molding structure 2 forms a complete cavity. The cavity is the shape of the product we want to prepare. Finally, the molten injection liquid is injected into the cavity to form the product we need. After cooling, the fixed structure 1 is opened, driving the molding structure 2 to open. At the same time, the ejection structure 3 is evenly arranged around the cavity and pushed out at the same time to eject the molded product to avoid deformation of the product due to uneven force.

[0032] The molding structure 2 includes: a circular cavity group; the circular cavity group is provided with ejection holes and injection holes; the ejection holes are evenly arranged on the circumference of the circular cavity group, and the injection holes are arranged in the middle of the circular cavity group;

[0033] In a preferred embodiment of the present invention, the circular mold cavity group includes a concave mold cavity 20 and a convex mold cavity 21 matched with the concave mold cavity 20 .

[0034] In a preferred embodiment of the present invention, the female mold cavity 20 and the male mold cavity 21 are used to form a complete and closed cavity, and the injection hole is opened at the middle position of the female mold cavity 20.

[0035] It should be noted that the outer side of the circular cavity group is a closed circular setting or a setting similar to a circular setting, that is, the product obtained by injection molding of the circular cavity group is circular or a setting similar to a circular setting, and the concave model cavity 20 and the convex model cavity 21 are two cores of the injection mold respectively. When the concave model cavity 20 and the convex model cavity 21 are closed, a cavity can be formed inside them, and the cavity is the shape of the product we need, and when the concave model cavity 20 and the convex model cavity 21 are completely closed, the outer circumference is closed, and a cavity setting of the shape of the desired product is formed inside, so that during injection molding During the process, the molten injection liquid flows into the cavity through the injection hole to fill the cavity. During the injection molding process, the molten injection liquid enters the cavity, increasing the internal pressure of the cavity, thereby compressing and discharging the air inside the cavity. As the cavity is filled with injection liquid, the increased pressure in the cavity due to the entry of injection liquid cannot open the closed concave mold cavity 20 and the convex mold cavity 21. Therefore, the injection liquid cannot flow out of the cavity until it is cooled to form a complete product. The closed concave mold cavity 20 and the convex mold cavity 21 provide pressure through the fixed structure 1 to prevent the pressure inside the cavity from opening the cavity.

[0036] The ejection structure 3 includes: a spring group 30, a plurality of ejection shafts 31 fixedly connected to the spring group 30, and a limiting shaft 32 fixedly connected to the spring group 30; the limiting shaft 32 is only in contact with the fixed structure for compressing the spring group 30;

[0037] In a preferred embodiment of the present invention, the spring assembly 30 includes a circular groove body and a plurality of springs disposed in the circular groove body; the plurality of springs are nested and have the same length.

[0038] In a preferred embodiment of the present invention, the ejector shaft 31 and the ejector hole can be in transitional fit, and the ejector shaft 31 is used to eject the molded product.

[0039] It should be noted that the spring group 30 includes a plurality of springs of equal length and gradually decreasing diameters, and the plurality of springs are placed in a nested manner, that is, the spring with the largest diameter is arranged at the outermost side, and the springs are placed inside the spring with the largest diameter in descending order of diameter, thereby forming a spring group 30, so that when the product is ejected, a force is provided to eject the molded product adhered to the inner wall of the concave mold cavity 20, and a circular groove body is arranged on the top of the plurality of springs, and the cross section of the circular groove body is arranged in a "J" shape, so that the "J"-shaped circular groove body has two horizontal planes and a groove, one of which is a higher horizontal plane. One is a lower horizontal plane, and the groove is located in the middle of the circular groove body, a number of springs are arranged in the groove, the ejector shaft 31 is fixedly connected to the top of the higher horizontal plane, and the limiting shaft 32 is arranged at the top of the lower horizontal plane. The top of the ejector shaft 31 is transitionally matched with the ejection hole, and during the injection molding process, the ejector shaft 31 is located at the ejection hole and is in direct contact with the injection liquid, but due to the pressure of the fixed structure 1 and the direct cooperation between the ejector shaft 31 and the ejection hole, the injection liquid will not flow out of the ejection hole, and the cavity formed by the closing of the concave model cavity 20 and the convex model cavity 21 and the top of the ejector shaft 31 together form a smooth surface of the product.

[0040] The fixed structure 1 comprises: a fixed plate group, a feed port 13 opened in the middle of the fixed plate group, and a fixed cavity opened in the middle of the fixed plate group; the molding structures 2 are fixedly connected in the fixed cavity.

[0041] In a preferred embodiment of the utility model, the fixing plate group includes an upper fixing plate 10 and a lower fixing plate 11 ; the fixing cavity includes an upper fixing cavity and a lower fixing cavity, the upper fixing cavity is opened on the upper fixing plate 10 , and the lower fixing cavity is opened on the lower fixing plate 11 .

[0042] In a preferred embodiment of the present invention, the center of the feed port 13 and the center of the injection hole are located on the same axis and are in a connected state.

[0043] In a preferred embodiment of the present invention, the concave mold cavity 20 is fixedly connected to the upper fixed cavity, and the convex mold cavity 21 is fixedly connected to the lower fixed cavity.

[0044] In a preferred embodiment of the utility model, a plurality of alignment shafts 12 are evenly fixedly connected to the lower fixing plate 11 around the periphery, and a plurality of alignment holes are evenly opened on the upper fixing plate 10 around the periphery, and the alignment shafts 12 are slidably connected to the alignment holes.

[0045] It should be noted that the concave model cavity 20 is fixedly connected to the upper fixed cavity of the upper fixed plate 10, and the convex model cavity 21 is fixedly connected to the lower fixed cavity of the lower fixed plate 11, and the concave model cavity 20 is arranged in a concave shape on the upper fixed plate 10, and the convex model cavity 21 is arranged in a convex shape on the lower fixed plate 11, so that when the upper fixed plate 10 and the lower fixed plate 11 are closed and fully fitted, the interior of the concave model cavity 20 and the convex model cavity 21 are just completely closed to form a cavity, and the centers of the feed port 13 and the injection hole are located on the same axis. The alignment axis 12 is set when the fixed plate and the lower fixed plate 11 are closed and the interior of the concave model cavity 20 and the convex model cavity 21 are just completely closed to form a cavity, and this state is a fully closed state. The alignment axis 12 includes four long axes, and the four long axes are evenly fixedly connected to the lower fixed plate 11. In the fully closed state , four alignment holes are opened at four positions on the upper fixed plate 10 corresponding to the four long axes, and the alignment axis 12 and the alignment hole are slidably connected, that is, the long axis and the alignment hole are slidably connected, so when an external force is applied to the upper fixed plate 10, the upper fixed plate 10 slides along the alignment axis 12, and as the upper fixed plate 10 and the lower fixed plate 11 are directly closed, the concave model cavity 20 and the convex model cavity 21 are gradually closed, and the lower fixed plate 11 is fixedly arranged on the workbench, and two pull rings are fixedly connected to the outer side of the upper fixed plate 10, and the pull rings are fixedly connected to the hydraulic cylinder, so that an external force is applied to the upper fixed plate 10 through the reciprocating motion of the hydraulic cylinder, and a top groove is also opened at the bottom of the upper fixed cavity on the inner side of the upper fixed plate 10, and the ejection structure 3 is arranged in the top groove, that is, the bottoms of several springs in the spring group 30 are fixedly connected to the bottom of the top groove of the upper fixed plate 10, and the circular groove body is slidably connected to the top groove.

[0046] When in use, injection molding is carried out, and the hydraulic cylinder fixedly connected to the pull ring on the outer side of the upper fixed plate 10 is extended, applying a thrust to the upper fixed plate 10, so that the upper fixed plate 10 gradually closes with the lower fixed plate 11 along the alignment axis 12 until the upper fixed plate 10 and the lower fixed plate 11 are completely closed. In this process, the top of the limiting shaft 32 first contacts the lower fixed plate 11, and as the upper fixed plate 10 and the lower fixed plate 11 gradually close, the circular groove body is gradually pushed to move toward the bottom of the top groove, so that several springs are compressed and the ejection shaft 31 gradually moves toward the top groove direction, and the top of the ejection shaft 31 is just located inside the concave model cavity 20 and forms a complete product surface with the concave model cavity 20, and reaches a fully closed state.

[0047] After reaching the fully closed state, injection molding is performed, and the molten injection liquid, that is, the molten plastic, is injected into the cavity formed by the female mold cavity 20 and the male mold cavity 21 through the feed port 13 and the injection hole. After the injection liquid is cooled, the hydraulic cylinder behind the upper fixed plate 10 contracts to generate a pulling force to separate the upper fixed plate 10 from the lower fixed plate 11. At the same time, a number of springs recover their deformation to eject the product adhered to the female mold cavity 20.

[0048] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An injection mold for preventing a product from deforming, comprising: A fixing structure (1), a molding structure (2) arranged in the middle of the fixing structure (1), and an ejection structure (3) arranged on one side of the molding structure (2), characterized in that: The molding structure (2) comprises: a circular cavity group; the circular cavity group is provided with ejection holes and injection holes; the ejection holes are evenly arranged on the circumference of the circular cavity group, and the injection holes are arranged at the middle position of the circular cavity group; The ejection structure (3) comprises: a spring group (30), a plurality of ejection shafts (31) fixedly connected to the spring group (30), and a limiting shaft (32) fixedly connected to the spring group (30); the limiting shaft (32) is only in contact with the fixed structure for compressing the spring group (30); The fixing structure (1) comprises: a fixing plate group, a feed port (13) opened in the middle of the fixing plate group, and a fixing cavity opened in the middle of the fixing plate group; the forming structures (2) are all fixedly connected in the fixing cavity.

2. The injection mold for preventing product deformation according to claim 1, characterized in that: The circular mold cavity group comprises a concave mold cavity (20) and a convex mold cavity (21) matched with the concave mold cavity (20).

3. The injection mold for preventing product deformation according to claim 2, characterized in that: The concave mold cavity (20) and the convex mold cavity (21) are used to form a complete and closed cavity, and the injection hole is opened at the middle position of the concave mold cavity (20).

4. The injection mold for preventing product deformation according to claim 1, characterized in that: The spring group (30) comprises a circular groove body and a plurality of springs arranged in the circular groove body; the plurality of springs are arranged in a nested manner, and the springs have the same length.

5. The injection mold for preventing product deformation according to claim 1, characterized in that: The ejection shaft (31) and the ejection hole can be in transitional fit, and the ejection shaft (31) is used to eject the molded product.

6. The injection mold for preventing product deformation according to claim 2, characterized in that: The fixing plate group comprises an upper fixing plate (10) and a lower fixing plate (11); the fixing cavity comprises an upper fixing cavity and a lower fixing cavity, the upper fixing cavity is opened on the upper fixing plate (10), and the lower fixing cavity is opened on the lower fixing plate (11).

7. The injection mold for preventing product deformation according to claim 1, characterized in that: The center of the feed port (13) and the center of the injection hole are located on the same axis and are in a connected state.

8. The injection mold for preventing product deformation according to claim 6, characterized in that: The concave model cavity (20) is fixedly connected to the upper fixed cavity, and the convex model cavity (21) is fixedly connected to the lower fixed cavity.

9. The injection mold for preventing product deformation according to claim 6, characterized in that: The lower fixing plate (11) is evenly and fixedly connected with a plurality of alignment shafts (12) on all sides, and the upper fixing plate (10) is evenly and openly provided with a plurality of alignment holes on all sides, and the alignment shafts (12) are slidably connected with the alignment holes.

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