Inner screw gear mold

Abstract

The invention discloses an inner screw gear mold which comprises a bottom plate, a movable plate, a top plate, a screw, a transmission gear and a mold assembly, the top plate and the bottom plate are arranged in a spaced mode in the vertical direction, the movable plate is movably connected between the bottom plate and the top plate, the screw is connected with the bottom plate and penetrates through the movable plate, and the transmission gear is arranged in the mold assembly. The transmission gear is rotatably connected with the moving plate, a threaded hole in threaded fit with the screw rod is axially formed in the transmission gear, the mold assembly comprises a top mold, a bottom mold, an inner buckling rod and an ejector pin, the rod part of the inner buckling rod is rotatably connected with the moving plate and penetrates through the bottom mold, and the gear part of the inner buckling rod is meshed with the transmission gear; when the inner screw gear mold is opened, the inner buckling rod rotates relative to the injection molding piece while moving downwards along with the movable plate, so that the inner buckling rod is disengaged from the injection molding piece, the inner buckling rod is automatically separated from the injection molding piece, and automatic demolding of the injection molding piece is achieved. The production efficiency is improved; and the labor cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, in particular to an internal screw gear mold. Background Art

[0002] Injection molding is an efficient process for manufacturing plastic products. Its core lies in using an internal screw gear mold to give the molten plastic a specific shape and cool it to set. Among many plastic products, injection molded parts with internal or external thread structures (such as bottle caps, connectors, fasteners, etc.) are extremely widely used.

[0003] Currently, when using internal screw gear molds to produce injection molded parts with threads, the common demolding method is: after the injection molded part is cooled and formed in the mold cavity, the mold needs to be opened first. Due to the geometric characteristics of the thread, the injection molded part will form a tight meshing state with the threaded core or cavity of the mold after molding. In order to achieve demolding, the existing technology usually relies on manual intervention, that is, the operator needs to manually rotate the injection molded part or the threaded core in the mold after opening the mold to release the thread engagement before finally removing the product.

[0004] The demoulding method relying on manual rotation operation adds a rotation demoulding step, which makes the process more complicated, reduces production efficiency and increases labor costs. Summary of the Invention

[0005] The present invention aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, the present invention provides an internal screw gear mold that can automatically demold the injection molded part during mold opening, thereby improving production efficiency and reducing labor costs.

[0006] According to an embodiment of the present invention, an internal screw gear mold comprises a bottom plate, a movable plate, a top plate, a screw, a transmission gear and a mold assembly, wherein the top plate and the bottom plate are spaced apart in the up and down directions, and the movable plate is movably connected between the bottom plate and the top plate; the screw is connected to the bottom plate and passes through the movable plate; the transmission gear is rotatably connected to the movable plate, and a threaded hole is axially opened on the transmission gear, and the threaded hole is matched with the screw thread; the mold assembly comprises a top mold, a bottom mold, an inner button rod and an ejector pin, the top mold is connected to the top plate, the bottom mold is connected to the movable plate, the inner button rod comprises a rod portion and a gear portion that are coaxially fixedly connected, and the rod portion is rotatably connected to the movable plate The gear portion is meshed with the transmission gear, and the ejector pin is connected to the bottom plate and is passed through the movable plate and the bottom mold; wherein the axes of the screw, the transmission gear, the inner button rod and the ejector pin are parallel to the up and down directions, and the mold assembly has a mold closing state and a mold opening state. In the mold closing state, the top mold abuts against the bottom mold, and the top mold and the bottom mold jointly define a connected feed cavity and a mold cavity. An end of the rod portion close to the top plate is provided with an external thread and is located in the mold cavity, and at least a portion of the ejector pin is located in the feed cavity. In the mold opening state, the movable plate moves in a direction away from the top plate to separate the top mold from the bottom mold.

[0007] According to the internal screw gear mold of an embodiment of the present invention, the external thread on its internal button rod can be used to form the thread of the injection molded part. When the internal screw gear mold is opened, the internal button rod moves downward with the movable plate and rotates relative to the injection molded part to disengage the internal button rod from the injection molded part, thereby automatically separating the internal button rod from the injection molded part and realizing automatic demolding of the injection molded part, which is beneficial to improving production efficiency and reducing labor costs.

[0008] According to some embodiments of the present invention, the top mold includes a fixed mold plate and a cavity insert, the fixed mold plate is connected to the top plate, and the cavity insert is detachably connected to the fixed mold plate; the bottom mold includes a movable mold plate and a core insert, the movable mold plate is connected to the movable plate, and the core insert is detachably connected to the movable mold plate; in the mold closing state, the top mold abuts against the bottom mold, and the cavity insert and the core insert jointly define the feed cavity and the cavity.

[0009] According to some embodiments of the present invention, a first cooling channel is provided inside the cavity insert, and a second cooling channel is provided inside the core insert.

[0010] According to some embodiments of the present invention, a third cooling channel is provided inside the rod portion.

[0011] According to some embodiments of the present invention, there are multiple inner button rods, and there are multiple mold cavities. Each of the mold cavities is connected to the feed cavity, and the multiple inner button rods correspond one-to-one to the multiple mold cavities.

[0012] According to some embodiments of the present invention, the internal screw gear mold further includes a guide rod, the movable plate is provided with a guide hole, and in the up and down directions, the guide rod passes through the guide hole and cooperates with the guide hole for guidance.

[0013] According to some embodiments of the present invention, the internal screw gear mold further includes a telescopic rod, wherein the upper end of the telescopic rod is connected to the top plate in the up and down directions, and the lower end of the telescopic rod is passed through the movable plate and connected to the movable plate.

[0014] According to some embodiments of the present invention, the internal screw gear mold also includes a base and a limit member, the base is connected to the lower end of the movable plate, the limit member is connected to the upper end of the bottom plate, the upper end of the limit member has a limit groove, in the up and down directions, the projection of the base is located inside the projection of the limit groove, and the distance between the projection contour of the base and the projection contour of the limit groove is d, and d satisfies the relationship: d≤0.5mm.

[0015] According to some embodiments of the present invention, the internal screw gear mold further includes a locking member, which is detachably connected to the fixed mold plate and the movable mold plate in the mold closing state.

[0016] According to some embodiments of the present invention, the internal screw gear mold further includes a gasket, which is detachably connected between the movable plate and the bottom plate in the mold closing state, and the movable plate and the bottom plate are both in contact with the gasket in the up and down directions.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of an internal screw gear mold according to an embodiment of the present invention;

[0019] Figure 2 is a perspective view of an internal screw gear mold according to an embodiment of the present invention, wherein the fixed mold plate, movable mold plate, protective plate, movable plate and backing plate are not shown;

[0020] Figure 3 is an exploded view of an internal screw gear mold according to an embodiment of the present invention;

[0021] Figure 4is a perspective view of an inner buckle rod according to an embodiment of the present invention;

[0022] Figure 5 is a cross-sectional view of an inner buckle rod according to an embodiment of the present invention Figure 1 ;

[0023] Figure 6 is a cross-sectional view of an inner buckle rod according to an embodiment of the present invention Figure 2 .

[0024] Reference numerals:

[0025] Bottom plate 1; moving plate 2; guide hole 21; top plate 3; screw 4; transmission gear 5; threaded hole 51;

[0026] Mold assembly 6; top mold 61; fixed mold plate 611; cavity insert 612; bottom mold 62; movable mold plate 621; core insert 622; inner buckle 63; rod 631; external thread 6311; gear portion 632; ejector pin 64;

[0027] First cooling pipeline 7; second cooling pipeline 8; third cooling pipeline 9; guide rod 10; telescopic rod 20; base 30; limiter 40; limiter groove 401; locking member 50; pad 60; protection plate 70; accommodating groove 701; internal screw gear mold 100. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections, or communication; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The following combination Figures 1-6 The internal screw gear mold 100 according to an embodiment of the present invention will be described in detail.

[0033] Reference Figures 1-4 As shown, the internal screw gear mold 100 according to an embodiment of the present invention includes a base plate 1, a movable plate 2, a top plate 3, a screw 4, a transmission gear 5 and a mold assembly 6. The top plate 3 and the bottom plate 1 are spaced apart in the upper and lower directions. The movable plate 2 is movably connected between the base plate 1 and the top plate 3. The screw 4 is connected to the bottom plate 1 and passes through the movable plate 2. The transmission gear 5 is rotatably connected to the movable plate 2, and the transmission gear 5 is axially opened with a threaded hole 51. The threaded hole 51 is threadedly matched with the screw 4. The mold assembly 6 includes a top mold 61, a bottom mold 62, an inner button rod 63 and an ejector pin 64. The top mold 61 is connected to the top plate 3, and the bottom mold 62 is connected to the movable plate 2. The inner button rod 63 includes a rod portion 631 and a gear portion 632 that are coaxially fixedly connected. The rod portion 631 is rotatably connected to the movable plate 2 and passes through the bottom mold 62. The gear portion 632 is engaged with the transmission gear 5. The ejector pin 64 is connected to the bottom plate 1 and passes through the movable plate 2 and the bottom mold 62.

[0034] Among them, the axes of the screw 4, the transmission gear 5, the inner rod 63 and the ejector pin 64 are all parallel to the up and down directions. The mold assembly 6 has a closed mold state and an open mold state. In the closed mold state, the top mold 61 abuts against the bottom mold 62. The top mold 61 and the bottom mold 62 jointly define a connected feed cavity and a mold cavity. The end of the rod 631 close to the top plate 3 is provided with an external thread 6311 and is located in the mold cavity. At least part of the ejector pin 64 is located in the feed cavity. In the open mold state, the movable plate 2 moves away from the top plate 3 to separate the top mold 61 from the bottom mold 62.

[0035] It can be understood that the internal screw gear mold 100 can be used to make injection molded parts. In the mold closing state, the plastic melt used to form the injection molded parts can be injected into the feed cavity, and the plastic melt in the feed cavity can flow into the mold cavity. The plastic melt in the mold cavity cools and solidifies to form the desired injection molded part. The plastic melt in the feed cavity cools and solidifies to form a sprue material. The sprue material and the injection molded part are an integral part. Since the rod portion 631 of the internal buckle rod 63 is close to the end of the top plate 3 and is provided with an external thread 6311 and is located in the mold cavity, the injection molded part has an internal thread meshing with the external thread 6311. Since at least part of the ejector pin 64 is located in the feed cavity, the molded sprue material is connected to the ejector pin 64.

[0036] In the mold opening state, the movable plate 2 moves away from the top plate 3, that is, referring to Figure 1 As shown, the movable plate 2 moves downward, and the movable plate 2 can drive the bottom mold 62, the transmission gear 5 and the inner button rod 63 to move downward synchronously. Since the ejector pin 64 is connected to the bottom plate 1, the ejector pin 64 is fixed. The ejector pin 64 can support the sprue material to prevent the sprue material and the injection molded part from moving downward synchronously with the bottom mold 62, so as to facilitate the ejection of the sprue material and the injection molded part from the bottom mold 62 as a whole. Under the threaded cooperation between the screw rod 4 and the threaded hole 51 of the transmission gear 5, the transmission gear 5 rotates around its axis, so that the transmission gear 5 can drive the gear part 632 meshing with the transmission gear 5 to rotate, and then the gear part 632 drives the rod part 631 to rotate synchronously, so that the inner button rod 63 moves downward and its rod part 631 can rotate relative to the injection molded part, so that the rod part 631 is disengaged from the injection molded part, and the injection molded part is automatically demolded.

[0037] In this embodiment, the internal screw gear mold 100 can realize automatic demolding of the injection molded part during the mold opening process, without the need to manually rotate the injection molded part or the internal button rod 63 to demold the injection molded part, which is beneficial to simplifying the production process, thereby improving the production efficiency of the production line and reducing labor costs.

[0038] In some specific embodiments, the movable plate 2 can be connected to the base plate 1 through a cylinder. The cylinder can drive the movable plate 2 to move upward when it is lifted, and can drive the movable plate 2 to move downward when it is lowered, thereby realizing that the movable plate 2 is movably connected between the base plate 1 and the top plate 3. The transmission gear 5 can be rotatably connected to the movable plate 2 through a bearing, and the rod 631 can be rotatably connected to the movable plate 2 through a bearing.

[0039] According to the internal screw gear mold 100 of the embodiment of the present invention, the external thread 6311 on its internal button rod 63 can be used to form the thread of the injection molded part. When the internal screw gear mold 100 is opened, the internal button rod 63 moves downward with the movable plate 2 and rotates relative to the injection molded part, so that the internal button rod 63 is disengaged from the injection molded part, thereby automatically separating the internal button rod 63 from the injection molded part, realizing automatic demolding of the injection molded part, which is beneficial to improving production efficiency and reducing labor costs.

[0040] In some embodiments of the present invention, reference Figure 5 As shown, the top mold 61 includes a fixed mold plate 611 and a cavity insert 612, the fixed mold plate 611 is connected to the top plate 3, and the cavity insert 612 is detachably connected to the fixed mold plate 611, and the bottom mold 62 includes a movable mold plate 621 and a core insert 622, the movable mold plate 621 is connected to the movable plate 2, and the core insert 622 is detachably connected to the movable mold plate 621. In the mold closing state, the top mold 61 abuts against the bottom mold 62, and the cavity insert 612 and the core insert 622 jointly define the feed cavity and the cavity.

[0041] It can be understood that the cavity insert 612 is detachably connected to the fixed mold plate 611. When the cavity insert 612 is damaged, the cavity insert 612 can be replaced alone without replacing the entire top mold 61, which is beneficial to saving maintenance costs. The core insert 622 is detachably connected to the movable mold plate 621. When the core insert 622 is damaged, the core insert 622 can be replaced alone without replacing the entire bottom mold 62, which is beneficial to saving maintenance costs.

[0042] The cavity insert 612 can be detachably connected to the fixed plate 611 via fasteners, and the core insert 622 can be detachably connected to the movable plate 621 via fasteners. The fasteners can be screws, and the fasteners can also be bolts and nuts.

[0043] In some embodiments of the present invention, reference Figure 1 and Figure 5 As shown, the internal screw gear mold 100 also includes a protective plate 70. In the up and down directions, the protective plate 70 is connected between the fixed mold plate 611 and the movable plate 2. The protective plate 70 is provided with a receiving groove 701. At least part of the transmission gear 5 and the gear part 632 are located in the receiving groove 701. The protective plate 70 can reduce the risk of external impurities entering the meshing point between the transmission gear 5 and the gear part 632, which is beneficial to reducing the risk of the transmission gear 5 and the gear part 632 getting stuck at the meshing point.

[0044] In some embodiments of the present invention, a first cooling channel is defined within the cavity insert 612, and a second cooling channel is defined within the core insert 622. A cooling medium can flow into both the first and second cooling channels. The cooling medium in the first cooling channel can cool the cavity insert 612. After cooling, the cavity insert 612 can exchange heat with the plastic melt in the cavity. The cooling medium in the second cooling channel can cool the core insert 622. After cooling, the core insert 622 can exchange heat with the plastic melt in the cavity, thereby cooling the plastic melt and accelerating the solidification rate of the plastic melt. In addition, after cooling, the cavity insert 612 and the core insert 622 can exchange heat with different parts of the plastic melt, which is conducive to uniform cooling of the plastic melt, thereby shortening the cooling time, improving production efficiency, reducing internal stress in the injection molded part, reducing the risk of cracking and warping of the injection molded part, and improving production quality. The cooling medium can be cooling oil, cooling water, etc.

[0045] In some specific embodiments, referring to Figure 2 As shown, the first cooling channel can be connected to the cooling system outside the internal screw gear mold 100 through the first cooling pipeline 7, and the cooling medium output by the cooling system can flow into the first cooling channel through the first cooling pipeline 7. The second cooling channel can be connected to the cooling system through the second cooling pipeline 8, and the cooling medium output by the cooling system can flow into the second cooling channel through the second cooling pipeline 8.

[0046] In some embodiments of the present invention, a third cooling channel is opened inside the rod portion 631, and a cooling medium can be passed into the third cooling channel. The cooling medium can cool the rod portion 631. The rod portion 631 after cooling can exchange heat with the plastic melt in the cavity, thereby helping to further accelerate the solidification molding rate of the plastic melt, improve production efficiency, and further evenly cool the plastic melt in the cavity, reduce the internal stress of the injection molded parts, reduce the risk of cracking and warping of the injection molded parts, and help improve production quality.

[0047] In some specific embodiments, referring to Figure 2 As shown, the third cooling channel can be connected to the cooling system through the third cooling pipeline 9, and the cooling medium output by the cooling system can flow into the third cooling channel through the third cooling pipeline 9.

[0048] In some embodiments of the present invention, there are multiple inner rods 63. In the mold closing state, there are multiple cavities, each cavity is connected to the feed cavity, and the multiple inner rods 63 correspond one-to-one to the multiple cavities.

[0049] It can be understood that in the mold closing state, there are multiple cavities. After the plastic melt is injected into the feed cavity, the plastic melt in the feed cavity can flow into each cavity for molding, so that multiple injection molded parts can be produced at the same time, which is beneficial to improving the production efficiency of injection molded parts.

[0050] In some embodiments of the present invention, reference Figure 2 and Figure 6 As shown, the internal screw gear mold 100 also includes a guide rod 10, and the movable plate 2 is provided with a guide hole 21. In the up and down directions, the guide rod 10 is passed through the guide hole 21 and cooperates with the guide hole 21 to guide the movable plate 2 so that the movable plate 2 moves along the up and down directions. During the mold opening process, the risk of the moving direction of the movable plate 2 being offset can be reduced, thereby reducing the risk of the axis of the internal button rod 63 connected to the movable plate 2 being offset, which is beneficial to keeping the axis of the internal button rod 63 coaxial with the axis of the internal thread of the injection molded part, so that the internal button rod 63 can rotate smoothly, thereby facilitating the smooth separation of the internal button rod 63 from the injection molded part, and ensuring the smooth demolding of the injection molded part.

[0051] Among them, there are multiple guide rods 10, and the movable plate 2 is provided with multiple guide holes 21. The multiple guide rods 10 correspond one-to-one to the multiple guide holes 21. Each guide rod 10 is passed through the corresponding guide hole 21 and guided and matched with the guide hole 21. The multiple guide rods 10 and the multiple guide holes 21 can form multiple groups of guiding matches, which can effectively reduce the risk of deviation in the moving direction of the movable plate 2.

[0052] In some embodiments of the present invention, reference Figure 2 and Figure 6 As shown, the internal screw gear mold 100 also includes a telescopic rod 20. In the up and down directions, the upper end of the telescopic rod 20 is connected to the top plate 3, and the lower end of the telescopic rod 20 is passed through the movable plate 2 and connected to the movable plate 2. It can be understood that the telescopic direction of the telescopic rod 20 is the up and down direction, which can make the movable plate 2 move along the up and down direction. During the mold opening process, the deviation of the moving direction of the movable plate 2 can be further reduced, thereby further reducing the deviation of the axis of the inner button rod 63 connected to the movable plate 2, which is beneficial to keep the axis of the inner button rod 63 coaxial with the axis of the internal thread of the injection molded part, so as to facilitate the smooth rotation of the inner button rod 63, thereby facilitating the smooth separation of the inner button rod 63 from the injection molded part, and ensuring the smooth demolding of the injection molded part.

[0053] In some embodiments of the present invention, reference Figure 1 、 Figure 2 and Figure 5As shown, the internal screw gear mold 100 also includes a base 30 and a limit member 40. The base 30 is connected to the lower end of the movable plate 2, and the limit member 40 is connected to the upper end of the bottom plate 1. The upper end of the limit member 40 has a limit groove 401. In the up and down directions, the projection of the base 30 is located inside the projection of the limit groove 401, and the distance between the projection contour of the base 30 and the projection contour of the limit groove 401 is d, and d satisfies the relationship: d≤0.5mm. For example, d can be 0.5mm, 0.3mm, 0, etc. When the mold assembly 6 is in the mold opening state, the movable plate 2 can drive the base 30 to move downward, and at least part of the base 30 can be moved into the limit groove 401. In the circumferential direction of the base 30, the limit groove 401 can limit the base 30, reduce the risk of the base 30 offset, and thereby reduce the risk of the movable plate 2 offset.

[0054] In this embodiment, d=0, that is, the projection contour of the base 30 is the same as the projection contour of the limiting groove 401. When at least part of the base 30 moves into the limiting groove 401, the side wall of the base 30 can fit with the side wall of the limiting groove 401, which can effectively reduce the risk of the base 30 deflecting, thereby effectively reducing the risk of the movable plate 2 deflecting.

[0055] In some embodiments of the present invention, reference Figure 1 As shown, the internal screw gear mold 100 also includes a locking member 50. In the mold closing state, the locking member 50 is detachably connected to the fixed mold plate 611 and the movable mold plate 621, which can prevent the movable mold plate 621 from moving relative to the fixed mold plate 611, so that the cavity insert 612 and the core insert 622 remain in contact. When the plastic melt is injected into the feed cavity, the plastic melt can be prevented from leaking from between the cavity insert 612 and the core insert 622, which is conducive to the smooth molding of the plastic melt in the cavity.

[0056] It can be understood that the locking member 50 is detachably connected to the fixed template 611 and the movable template 621. In the mold open state, the locking member 50 can be removed from the fixed template 611 and the movable template 621 to facilitate the downward movement of the movable plate 2, which is beneficial to the separation of the cavity insert 612 and the core insert 622, so as to facilitate the smooth demolding of the injection molded parts.

[0057] In some embodiments, reference Figure 1 As shown, the locking member 50 is constructed as a plate-like structure, and the locking member 50 is provided with two through holes. On any same side of the fixed template 611 and the movable template 621, the fixed template 611 and the movable template 621 are respectively provided with screw holes corresponding to the two through holes one by one. In the mold closing state, two screws can be used to pass through the two through holes respectively and cooperate with the threads of the two screw holes respectively, so that the locking member 50 can be detachably connected to the fixed template 611 and the movable template 621.

[0058] In other embodiments not shown in the figures, the locking member 50 is constructed as a screw, one of the fixed template 611 and the movable template 621 is provided with a through hole, and the other is provided with a screw hole. The locking member 50 can pass through the through hole and cooperate with the screw hole thread, so that the locking member 50 can be detachably connected to the fixed template 611 and the movable template 621.

[0059] In some embodiments of the present invention, reference Figure 1 As shown, the internal screw gear mold 100 also includes a pad 60. In the mold closing state, the pad 60 is detachably connected between the movable plate 2 and the base plate 1, and in the up and down directions, the movable plate 2 and the base plate 1 are both in contact with the pad 60. The pad 60 can stop the movable plate 2 to prevent the movable plate 2 from moving downward, thereby preventing the bottom mold 62 from moving downward and preventing the bottom mold 62 from separating from the top mold 61. When the plastic melt is injected into the feed cavity, the plastic melt can be prevented from leaking from between the cavity insert 612 and the core insert 622, which is conducive to the smooth molding of the plastic melt in the cavity.

[0060] It can be understood that the pad 60 is detachably connected between the movable plate 2 and the base plate 1. In the mold opening state, the pad 60 can be removed from between the movable plate 2 and the base plate 1 to facilitate the downward movement of the movable plate 2, which is beneficial for the separation of the top mold 61 and the bottom mold 62, so that the injection molded parts can be smoothly demolded.

[0061] The pad 60 can be detachably connected to the movable plate 2 via fasteners, and the pad 60 can also be detachably connected to the base plate 1 via fasteners. The fasteners can be screws, or bolts and nuts.

[0062] According to the internal screw gear mold 100 of the embodiment of the present invention, the internal screw gear mold 100 is constructed as an internal screw gear mold. During the mold opening process, the internal screw gear mold 100 can realize automatic demolding of the injection molded part without manually rotating the injection molded part or the internal button rod 63 to demold the injection molded part, which is beneficial to simplifying the production process, thereby improving the production efficiency of the production line and reducing labor costs.

[0063] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0064] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An internal screw gear mold, characterized in that: include: A bottom plate (1), a movable plate (2) and a top plate (3), wherein the top plate (3) and the bottom plate (1) are spaced apart in the vertical direction, and the movable plate (2) is movably connected between the bottom plate (1) and the top plate (3); a screw rod (4), the screw rod (4) being connected to the bottom plate (1) and passing through the movable plate (2); A transmission gear (5), the transmission gear (5) is rotatably connected to the movable plate (2), and the transmission gear (5) is axially provided with a threaded hole (51), the threaded hole (51) being threadably engaged with the screw rod (4); A mold assembly (6), wherein the mold assembly (6) comprises a top mold (61), a bottom mold (62), an inner button rod (63) and an ejector pin (64); the top mold (61) is connected to the top plate (3); the bottom mold (62) is connected to the movable plate (2); the inner button rod (63) comprises a rod portion (631) and a gear portion (632) that are coaxially fixedly connected; the rod portion (631) is rotatably connected to the movable plate (2) and is inserted into the bottom mold (62); the gear portion (632) is engaged with the transmission gear (5); and the ejector pin (64) is connected to the bottom plate (1) and is inserted into the movable plate (2) and the bottom mold (62); The axes of the screw (4), the transmission gear (5), the inner rod (63) and the ejector pin (64) are all parallel to the up-down direction. The mold assembly (6) has a mold-closing state and a mold-opening state. In the mold-closing state, the top mold (61) abuts against the bottom mold (62). The top mold (61) and the bottom mold (62) jointly define a feed cavity and a mold cavity that are connected. The end of the rod (631) close to the top plate (3) is provided with an external thread (6311) and is located in the mold cavity. At least part of the ejector pin (64) is located in the feed cavity. In the mold-opening state, the movable plate (2) moves in a direction away from the top plate (3) to separate the top mold (61) from the bottom mold (62).

2. The internal screw gear mold according to claim 1, characterized in that: The top mold (61) includes a fixed mold plate (611) and a cavity insert (612), wherein the fixed mold plate (611) is connected to the top plate (3), and the cavity insert (612) is detachably connected to the fixed mold plate (611). The bottom mold (62) includes a movable mold plate (621) and a core insert (622), wherein the movable mold plate (621) is connected to the movable plate (2), and the core insert (622) is detachably connected to the movable mold plate (621). In the mold closing state, the top mold (61) abuts against the bottom mold (62), and the cavity insert (612) and the core insert (622) jointly define the feed cavity and the cavity.

3. The internal screw gear mold according to claim 2, characterized in that: A first cooling channel is provided inside the cavity insert (612), and a second cooling channel is provided inside the core insert (622).

4. The internal screw gear mold according to claim 3, characterized in that: A third cooling channel is provided inside the rod portion (631).

5. The internal screw gear mold according to claim 4, characterized in that: There are multiple inner button rods (63), and there are multiple mold cavities. Each mold cavity is connected to the feed cavity, and the multiple inner button rods (63) correspond to the multiple mold cavities one by one.

6. The internal screw gear mold according to claim 5, characterized in that: The internal screw gear mold further comprises a guide rod (10), and the movable plate (2) is provided with a guide hole (21). In the up and down directions, the guide rod (10) passes through the guide hole (21) and is guided and matched with the guide hole (21).

7. The internal screw gear mold according to claim 6, characterized in that: The internal screw gear mold further includes a telescopic rod (20), wherein the upper end of the telescopic rod (20) is connected to the top plate (3) in the up-down direction, and the lower end of the telescopic rod (20) is passed through the movable plate (2) and connected to the movable plate (2).

8. The internal screw gear mold according to claim 7, characterized in that: The internal screw gear mold further comprises a base (30) and a limiting member (40), wherein the base (30) is connected to the lower end of the movable plate (2), and the limiting member (40) is connected to the upper end of the bottom plate (1), and the upper end of the limiting member (40) has a limiting groove (401), and in the up-down direction, the projection of the base (30) is located inside the projection of the limiting groove (401), and the distance between the projection contour of the base (30) and the projection contour of the limiting groove (401) is d, and the distance d satisfies the relationship: d≤0.5mm.

9. The internal screw gear mold according to any one of claims 1 to 8, characterized in that: The internal screw gear mold further comprises a locking member (50), and in the mold closing state, the locking member (50) is detachably connected to the fixed mold plate (611) and the movable mold plate (621).

10. The internal screw gear mold according to claim 9, characterized in that: The internal screw gear mold further includes a cushion block (60). In the mold closing state, the cushion block (60) is detachably connected between the movable plate (2) and the base plate (1), and in the up and down directions, the movable plate (2) and the base plate (1) are both in contact with the cushion block (60).

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