A mechanism and mold for forming internal threads in an injection molded product

Abstract

The utility model discloses a kind of inner thread forming mechanisms of injection molding product, it is related to injection molding technical field, technical scheme is, including with the forming piece corresponding to product, the connecting assembly of supporting forming piece, linkage structure linked therewith, linkage structure contains the rotation linkage assembly of driving connecting assembly rotation and the translation linkage assembly of driving connecting assembly translation, and as the driving assembly of power source, driving assembly can provide the driving force of linear direction reciprocating motion.It is realized through the cooperation of rotation linkage assembly and translation linkage assembly, the rotation and translation compound motion of forming piece in demolding process, without relying on the elastic deformation of product material can complete inner thread demolding, effectively overcome the strict requirement of traditional forced demolding mode to material elasticity, suitable for high hardness, brittle material and high-precision inner thread product forming and demolding, significantly expand the application range.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an internal thread forming mechanism and mold for injection molded products. Background Technology

[0002] In the field of injection molding, products with internal thread structures (such as plastic bottle caps, pipe fittings, and medical device components) are widely used in many industries, including food packaging, plumbing and sanitary ware, and medical equipment, due to their characteristics of tight connection and reliable sealing. The internal thread molding and demolding process of these products is a key step in injection molding production, affecting the dimensional accuracy, surface quality, and production efficiency of the products.

[0003] Currently, the commonly used technical solutions in the industry for molding and demolding internal threads of injection molded products mainly fall into the following categories:

[0004] Firstly, a forced demolding method is used. This method is suitable for products with a large thread helix angle, wide pitch, and a certain degree of material elasticity. Demolding is achieved by forcibly pulling the product's internal thread against the mold core during mold opening, causing elastic deformation. However, this method requires extremely high elasticity from the product material, easily leading to damage to the thread profile, surface scratches, and even product cracking. It is particularly unsuitable for internal thread products made of high-precision, high-hardness, or brittle materials, significantly limiting its application.

[0005] Secondly, manual demolding is used. In some small-batch production or simple molds, the product is separated from the core by manually twisting it. However, this method is not only labor-intensive and extremely inefficient, but also makes it difficult to guarantee the stability of the demolding process. It is very easy for human error to cause deviations in the thread size or surface damage to the product, which cannot meet the needs of large-scale industrial production. Utility Model Content

[0006] To address one of the shortcomings of existing technologies, this utility model provides an internal thread forming mechanism for injection molded products, solving the demolding problem of products with internal threads during injection molding.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a mechanism for forming internal threads in injection molded products, comprising:

[0008] The molded part corresponds to the product that needs to be processed and can be inserted into the structure of the product with internal threads for internal thread injection molding.

[0009] A connecting component, connected to the molded part, is used to support the molded part;

[0010] The linkage structure is linked with the connecting component; the linkage structure includes:

[0011] A rotary linkage component, which is linked with the connecting component, can drive the connecting component to rotate;

[0012] The translation linkage component is linked with the connecting component and can drive the connecting component to translate.

[0013] A drive component, used as a power source for the linkage structure; the drive component includes:

[0014] The driving component can provide the driving force for reciprocating motion in a linear direction, and the driving component is linked with the linkage structure.

[0015] Preferably, the molded part includes:

[0016] The forming part is a contour structure corresponding to the internal thread of the product;

[0017] A connecting part is provided on one side of the molding part and can be fixedly connected to the connecting assembly;

[0018] The positioning section can position the initial position of the molded part.

[0019] Preferably, the connecting part is a cylindrical body with a connecting hole on it;

[0020] The positioning part is disposed between the connecting part and the forming part; the positioning part is a block, and the outer surface of the block includes an arc surface and a straight surface.

[0021] The molding mechanism further includes:

[0022] The positioning assembly includes a positioning rod disposed below the molded part, the end of which can abut against the flat surface of the positioning part.

[0023] Preferably, the connection component includes:

[0024] The first connector has one end detachably connected to the connecting part of the molded part;

[0025] The second connector is sleeved on the outside of the first connector, and the outside of the second connector is connected to the external structure.

[0026] The first connector and the second connector are rotatably connected.

[0027] Preferably, the rotation linkage component includes:

[0028] The rack is linked to the drive component of the drive assembly, and the rack can perform reciprocating motion in a linear direction under the drive of the drive component;

[0029] The gear is fixedly disposed on the outside of the first connector. The gear is coaxial with the first connector and meshes with the rack.

[0030] Preferably, a guide groove is provided on the side of the rack, and the guide groove is provided along the length direction of the rack; the rotary linkage assembly further includes:

[0031] A guide block is disposed on the side of the rack. The guide block and the guide groove are slidably connected, and the guide block is fixedly connected to the external structure.

[0032] Preferably, the translation linkage component includes:

[0033] The first linkage component is located on the side of the connecting assembly away from the molded part, and the first linkage component is fixedly connected to the external structure.

[0034] The second linkage is fixedly connected to the first connecting member, and the second linkage is threadedly connected to the first linkage.

[0035] Preferably, the first linkage component is a cylindrical body, and the first linkage component is provided with internal threads;

[0036] The second linkage component is a screw with external threads.

[0037] Preferably, the first connector, the gear, and the second linkage are integrally formed;

[0038] The second connector is provided in two parts, located on both sides of the gear respectively.

[0039] A mold that uses the aforementioned internal thread forming mechanism for injection molded products.

[0040] Compared with existing technologies, it has the following beneficial effects:

[0041] Wide range of applications: This solution achieves combined rotation and translation of the molded part during demolding through the synergistic action of the rotation linkage component and the translation linkage component. It can complete the demolding of internal threads without relying on the elastic deformation of the product material, effectively overcoming the strict requirements of traditional forced demolding methods on material elasticity. It is suitable for the molding and demolding of high hardness, brittle materials and high-precision internal thread products, significantly expanding the application range.

[0042] Improve product quality: During the demolding process, the molded part and the product's internal thread are smoothly separated through a combination of rotation and translation, avoiding problems such as thread profile damage, surface scratches, and product cracking caused by forced demolding. At the same time, it eliminates thread size deviations caused by manual demolding due to operational errors, ensuring the dimensional accuracy and surface quality of the product's internal thread.

[0043] Improved production efficiency: This solution provides power through drive components to automate the internal thread forming and demolding operations. Compared with manual demolding, it significantly reduces labor intensity and improves production efficiency, meeting the needs of large-scale industrial production. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application. Figure 1 ;

[0045] Figure 2 for Figure 1 A magnified view of part A;

[0046] Figure 3 This is a schematic diagram of the overall structure of an embodiment of this application. Figure 2 ;

[0047] Figure 4 for Figure 3 A magnified view of part A;

[0048] Figure 5 This is a schematic diagram of the molded part structure according to an embodiment of this application. Figure 1 ;

[0049] Figure 6 This is a schematic diagram of the molded part structure according to an embodiment of this application. Figure 2 ;

[0050] Figure 7 This is a schematic diagram of the structure of the first connector in an embodiment of this application.

[0051] In the picture:

[0052] 100. Products;

[0053] 1. Molded part; 11. Molding section; 12. Connecting section; 13. Positioning section;

[0054] 2. Connecting component; 21. First connector; 22. Second connector;

[0055] 3. Linkage structure; 31. Rotary linkage component; 311. Rack; 312. Gear; 313. Guide block;

[0056] 32. Translation linkage component; 321. First linkage component; 322. Second linkage component;

[0057] 4. Drive assembly; 5. Positioning assembly; 51. Positioning rod. Detailed Implementation

[0058] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0059] Please see Figures 1-7 This application provides the following technical solutions:

[0060] A mechanism for forming internal threads in injection molded products is disclosed. This mechanism is applied to the processing of injection molded products with internal thread structures and is located inside the injection mold during use. The mechanism includes a molding part 1, a connecting assembly 2, a linkage structure 3, and a drive assembly 4. The molding part 1 is used to form the internal thread structure of the product 100. The molding part 1 corresponds to the product 100 to be processed and can be inserted into the internal thread structure of the product 100 for internal thread injection molding. A connecting assembly 2 is provided corresponding to the molding part 1, and the connecting assembly 2 is connected to the molding part 1 to support the molding part 1. Considering demolding during mold opening, the mechanism includes a linkage structure 3 for demolding. The linkage structure 3 is linked with the connecting assembly 2, causing the connecting assembly 2 to drive the molding part 1 to detach from the product 100. The linkage structure 3 includes a rotary linkage assembly 31 and a translational linkage assembly 32, both of which are linked to the connecting assembly 2. The rotary linkage assembly 31 drives the connecting assembly 2 to rotate, and the translational linkage assembly 32 drives the connecting assembly 2 to translate. These two components work together to achieve the movement of the molding part 1 detaching from the product 100.

[0061] The mechanism also includes a drive assembly 4, which serves as the power source for the linkage structure 3. The drive assembly 4 includes a drive component 41, which can be a cylinder, and provides power to the linkage structure 3 through the drive component 41.

[0062] Based on the above implementation scheme, the molded part 1 includes a molding part 11, a connecting part 12, and a positioning part 13. The molding part 11 is a contoured structure corresponding to the internal thread of the product 100. The connecting part 12 is disposed on one side of the molding part 11 and can be fixedly connected to the connecting assembly 2. The positioning part 13 can position the molded part 1 at its initial position.

[0063] See Figure 5 and Figure 6The connecting part 12 is cylindrical with a connecting hole. The positioning part 13 is located between the connecting part 12 and the forming part 11. The forming part 11 includes a frustum-shaped conical structure connected to the positioning part 13. On the side of this structure away from the positioning part 13, a forming structure corresponding to the internal thread of the product is provided. A stud is provided on the side of the forming structure away from the positioning part 13, extending further into the internal thread structure of the product 100. The positioning part 13 is a block structure, and its outer surface includes an arc surface and a straight surface. Corresponding to the positioning part 13, this solution provides a positioning component 5, which includes a positioning rod 51 located below the forming part 1. The end of the positioning rod 51 is also flat, not arc-shaped. The end of the positioning rod 51 can abut against the straight surface of the positioning part 13. The positioning component 5 is adapted according to the actual situation of the mold, and its function is to abut against the straight surface of the positioning part 13 through the abutment of the end of the positioning rod 51. By using the positioning rod 51 in conjunction with the positioning part 13, the working position of the molded part 1 during injection molding can be determined.

[0064] Based on the above implementation plan, see Figure 4 The connecting assembly 2 includes a first connecting member 21 and a second connecting member 22. One end of the first connecting member 21 is detachably connected to the connecting portion 12 of the molded part 1, and its end has an insertion hole, the wall of which also has a connecting hole. The connecting portion 12 of the molded part 1 can be inserted into the insertion hole of the first connecting member 21, and then the two can be fixed together with bolts.

[0065] The second connector 22 is sleeved on the outside of the first connector 21, and the outside of the second connector 22 is connected to the external structure; the first connector 21 and the second connector 22 are rotatably connected. The second connector 22 forms a sleeve-like structure relative to the first connector 21, which facilitates the rotational stability of the first connector 21.

[0066] Based on the above implementation scheme, the rotary linkage assembly 31 includes a rack 311 and a gear 312. The rack 311 is linked with the movable end of the drive member 41, and the rack 311 can perform reciprocating motion in a linear direction under the drive of the drive member 41; the gear 312 is fixedly disposed on the outside of the first connecting member 21, the gear 312 is coaxial with the first connecting member 21, and the gear 312 meshes with the rack 311.

[0067] The translation linkage assembly 32 includes a first linkage member 321 and a second linkage member 322. The first linkage member 321 is fixedly mounted on the side of the connecting assembly 2 away from the molded part 1 by a bracket. The second linkage member 322 is fixedly connected to the first connecting member 21, and the second linkage member 322 and the first linkage member 321 are threaded together.

[0068] Under the positioning action of the second connector 22, the drive member 41 drives the rack 311 to move, and then the rack 311 drives the gear 312 to rotate the first connector 21. As the first connector 21 rotates, the second linkage 322 and the first linkage 321 twist, and the second linkage 322 moves axially, thereby causing the first connector 21 to drive the molded part 1 to unscrew from the internal thread position of the product 100, completing the partial demolding.

[0069] Based on the above implementation scheme, guide grooves are provided on both sides of the rack 311, and the guide grooves are opened along the length direction of the rack 311. Four guide blocks 313 are provided corresponding to the guide grooves of the rack 311. The guide blocks 313 are connected to other fixed structures of the mold and are slidably connected to the guide grooves. The guide blocks 313 mainly play a role in assisting the stability of the movement of the rack 311.

[0070] Based on the above implementation plan, see Figure 7 The first linkage 321 is a cylindrical body and has an internal thread; the second linkage 322 is a screw with an external thread. The first connecting member 21, the gear 312, and the second linkage 322 are integrally formed. See also Figure 4 There are two second connectors 22, located on both sides of the gear 312.

[0071] With this structure, when the first connector 21 moves, its range of motion is between the two second connectors 22, and the second connectors 22 play an auxiliary limiting role.

[0072] In addition, the width of gear 312 is smaller than the width of rack 311, and the width of rack 311 needs to ensure that the displacement of gear 312 will not disengage from rack 311 when the first connecting member 21 moves along its own axis.

[0073] Based on the above implementation scheme, this structure can process multiple products 100 at the same time. The rack 311 can be shared, and multiple first forming parts 1, first connecting parts 21 and gears 312 can be set for the corresponding products.

[0074] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application 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 application.

[0075] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0076] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0078] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0079] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A mechanism for forming internal threads in injection molded products, characterized in that, include: The molded part corresponds to the product that needs to be processed and can be inserted into the structure of the product with internal threads for internal thread injection molding. A connecting component, connected to the molded part, is used to support the molded part; The linkage structure is linked with the connecting component. The linkage structure includes: A rotary linkage component, which is linked with the connecting component, can drive the connecting component to rotate; The translation linkage component is linked with the connecting component and can drive the connecting component to translate. A drive component, used as a power source for the linkage structure; the drive component includes: The driving component can provide the driving force for reciprocating motion in a linear direction, and the driving component is linked with the linkage structure.

2. The internal thread forming mechanism for injection molded products as described in claim 1, characterized in that, The molded part includes: The forming part is a contour structure corresponding to the internal thread of the product; A connecting part is provided on one side of the molding part and can be fixedly connected to the connecting assembly; The positioning section can position the initial position of the molded part.

3. The injection molding product internal thread forming mechanism as described in claim 2, characterized in that, The connecting part is a cylindrical body with a connecting hole on it; The positioning part is disposed between the connecting part and the forming part; the positioning part is a block, and the outer surface of the block includes an arc surface and a straight surface. The molding mechanism further includes: The positioning assembly includes a positioning rod disposed below the molded part, the end of which can abut against the flat surface of the positioning part.

4. The injection molding product internal thread forming mechanism as described in claim 2, characterized in that, The connection component includes: The first connector has one end detachably connected to the connecting part of the molded part; The second connector is sleeved on the outside of the first connector, and the outside of the second connector is connected to the external structure. The first connector and the second connector are rotatably connected.

5. The injection molding product internal thread forming mechanism as described in claim 4, characterized in that, The rotation linkage component includes: The rack is linked to the drive component of the drive assembly, and the rack can perform reciprocating motion in a linear direction under the drive of the drive component; The gear is fixedly disposed on the outside of the first connector. The gear is coaxial with the first connector and meshes with the rack.

6. The injection molding product internal thread forming mechanism as described in claim 5, characterized in that, The rack has a guide groove on its side, which extends along the length of the rack; the rotary linkage assembly also includes: A guide block is disposed on the side of the rack. The guide block and the guide groove are slidably connected, and the guide block is fixedly connected to the external structure.

7. The injection molding product internal thread forming mechanism as described in claim 5, characterized in that, The translation linkage component includes: The first linkage component is located on the side of the connecting assembly away from the molded part, and the first linkage component is fixedly connected to the external structure. The second linkage is fixedly connected to the first connecting member, and the second linkage is threadedly connected to the first linkage.

8. The injection molding product internal thread forming mechanism as described in claim 7, characterized in that, The first linkage component is a cylindrical body, and the first linkage component is provided with internal threads; The second linkage component is a screw with external threads.

9. The injection molding product internal thread forming mechanism as described in claim 8, characterized in that, The first connector, the gear, and the second linkage are integrally formed; The second connector is provided in two parts, located on both sides of the gear respectively.

10. A mold, characterized in that, Use the internal thread forming mechanism for injection molded products as described in any one of claims 1-9.

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