A lightweight mold for a high-sealing bottle neck and its molding process

Abstract

This invention relates to the field of drinking bottle technology, and more particularly to a lightweight mold for a high-sealing bottle mouth and its molding process. The mold includes a left slider, a right slider, and a core. Both the left and right sliders have bottle mouth mechanisms on their inner walls. Through the design of these bottle mouth mechanisms, during injection molding, the arc-shaped grooves form the sealing threads on the outer wall of the bottle mouth, and the interruption structure between adjacent arc-shaped grooves reduces the overall material usage of the bottle mouth, resulting in a lighter overall bottle mouth. Vertical grooves and arc-shaped protrusions form axial reinforcing ribs inside the bottle mouth. While achieving material weight reduction, this mold effectively improves the torsional strength and structural rigidity of the bottle mouth, thereby achieving a substantial reduction in the overall weight of the bottle mouth. It also effectively avoids problems such as insufficient torsional stiffness, easy creep deformation in the threaded load-bearing area, and decreased dimensional stability after repeated tightening caused by simply thinning the wall thickness.

Description

Technical Field

[0001] This invention relates to the field of drinking bottle technology, specifically to a lightweight mold with high sealing performance for the bottle opening and its molding process. Background Technology

[0002] As living standards improve, the demand for portable beverages is increasing. Currently, commercially available portable beverages are packaged in beverage bottles, which generally consist of a bottle body and a cap for sealing the bottle opening. The cap and bottle body are usually sealed by a threaded connection.

[0003] The existing bottle opening has a continuous multi-turn single thread, and in order to ensure sufficient sealing, the thread is usually set as a long thread, and the bottle opening is relatively thick. When facing large-volume orders, more plastic raw materials are required, which leads to an increase in production costs. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a lightweight mold with high sealing performance for bottle mouth and its molding process.

[0005] This invention provides a lightweight mold for a high-sealing bottle mouth, comprising a left slider, a right slider, and a core. The inner walls of both the left and right sliders are provided with bottle mouth mechanisms. A core plate is threadedly connected to the rear ends of several cores. A limiting mechanism is provided on the front side of the core plate. The bottle mouth mechanism includes multiple arc-shaped grooves formed on the inner walls of the left and right sliders. Vertical grooves are axially spaced at equal intervals on the surface of the cores. An arc-shaped protrusion is fixedly connected to the center of each vertical groove. The limiting mechanism includes a push plate disposed on the front side of the core plate. A limiting post is threadedly connected to the rear center of the core plate. A top plate is fixedly connected to the rear side of the core plate. A pad is fixedly connected to the center of both the top plate and the core plate.

[0006] Preferably, a first fixing plate and a third fixing plate are threadedly connected to the rear side of a plurality of left sliders, and a second fixing plate and a fourth fixing plate are threadedly connected to the rear side of a plurality of right sliders. The first fixing plate and the fourth fixing plate are symmetrically arranged on the front side of the push plate, and the second fixing plate and the third fixing plate are symmetrically arranged on the front side of the push plate.

[0007] Preferably, the upper and lower rear ends of the first and third fixed plates are respectively threaded with a first sliding plate and a second sliding plate, and the upper and lower rear ends of the second and fourth fixed plates are respectively threaded with a third sliding plate and a fourth sliding plate, and the first sliding plate, the second sliding plate, the third sliding plate and the fourth sliding plate are all slidably connected to the front of the push plate.

[0008] Preferably, the core plate has guide plates threadedly connected to both the upper and lower ends of its front side, and guide grooves are provided on the opposite sides of the two guide plates. Guide members that are adapted to the guide grooves are rotatably connected to the upper and lower sides of the second and third fixing plates.

[0009] Preferably, a linkage plate is fixedly connected to the rear side of the core plate, and a first hydraulic cylinder is fixedly connected to the rear side of the linkage plate.

[0010] Preferably, a rear support is fixedly connected to the rear side of the first hydraulic cylinder, four guide rods are symmetrically fixedly connected to the front side of the rear support, a front support is fixedly connected to the front side of the guide rods, a fixed mold is fixedly connected to the rear side of the front support, and a groove adapted to the core is opened on the rear side of the fixed mold.

[0011] Preferably, a second hydraulic cylinder is fixedly connected to the rear side of the top plate and fixedly connected to the linkage plate. The linkage plate, the top plate and the core plate are all slidably connected to the surface of the guide rod. A buffer pad is fixedly connected to the surface of the pad. A groove adapted to the pad is opened in the middle of the rear side of the push plate.

[0012] A molding process for a lightweight mold with high sealing performance for bottle openings is also provided, characterized by the following steps: S1. Mold Closure and Injection Molding: The left and right sliders are closed and the core is held tightly, so that the arc grooves on the inner sidewalls of the left and right sliders, together with the vertical grooves and arc protrusions on the surface of the core, form the bottle mouth forming cavity. Injection molding material is injected into the forming cavity to form the bottle mouth blank; wherein, the arc grooves are used to form the sealing threads on the outer wall of the bottle mouth, and the interruption structure between adjacent arc grooves is used to reduce the amount of bottle mouth material used; the vertical grooves and arc protrusions are used to form the axial reinforcing ribs on the inner wall of the bottle mouth; S2. Cooling and Shaping: Cooling the bottle neck blank inside the molding cavity to solidify and shape it; S3, Lateral Core Pulling and Thread Removal: The second hydraulic cylinder is activated, pushing the push plate forward through the top plate and pad block. This drives the first, second, third, and fourth sliding plates to slide along the front of the push plate, causing the first, second, third, and fourth fixed plates, as well as the corresponding left and right sliders, to slide laterally along the guide groove of the guide plate. This separates the left and right sliders from the sealing threads on the outer wall of the bottle mouth, completing the thread demolding. At the same time, the pad block limits the forward movement limit of the push plate to prevent the sliders from moving excessively. S4. Core plate retraction: Start the first hydraulic cylinder, which drives the core plate and core to retract axially along the guide rod through the linkage plate, so that the core is pulled out from the inner wall of the bottle neck blank; S5. Ejection and removal: The ejection mechanism ejects the molded bottle neck product from the mold, completing the demolding and removal process. S6. Reset and mold closing: The second hydraulic cylinder drives the push plate to retreat and reset, the first hydraulic cylinder pushes the core plate and core forward and reset, the left slider and right slider re-close the mold and hold the core, and enter the next injection cycle.

[0013] Compared with related technologies, the present invention provides the following beneficial effects: 1. Through the design of the bottle mouth mechanism, during the injection molding process, the arc groove is used to form the sealing thread on the outer wall of the bottle mouth, and the interruption structure between adjacent arc grooves is used to reduce the overall material usage of the bottle mouth, making the overall bottle mouth lightweight. The vertical groove and arc protrusion are used to form the axial reinforcing ribs inside the bottle mouth. While achieving material lightweighting, the torsional strength and structural rigidity of the bottle mouth are effectively improved, thereby achieving a substantial reduction in the overall weight of the bottle mouth. At the same time, it effectively avoids the problems of insufficient torsional stiffness, easy creep deformation in the thread bearing area, and decreased dimensional stability after repeated tightening caused by simply thinning the wall thickness.

[0014] 2. By setting up a limiting mechanism, during the injection molding demolding process, the second hydraulic cylinder pushes the push plate forward through the top plate and the pad block, driving each sliding plate and the fixed plate to move the left and right sliders laterally along the guide groove to achieve thread demolding. The pad block physically limits the forward and backward limit positions of the push plate, preventing the slider from moving too far forward or backward, which would cause the guide parts to fall out of the guide groove or be damaged by collision. This effectively avoids mold collision damage caused by the slider movement exceeding the range, and ensures the molding accuracy and mold life of the lightweight bottle neck thin-walled structure during repeated opening and closing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall disassembled structure of the present invention; Figure 3 This is a schematic diagram of the disassembled slider structure of the present invention; Figure 4 This is a schematic diagram of the structure on the left side of the present invention.

[0016] The diagram is labeled as follows: 1. Left slider; 2. Right slider; 3. Core; 4. Bottle mouth mechanism; 401. Arc groove; 402. Vertical groove; 403. Arc protrusion; 5. Core plate; 6. Limiting mechanism; 601. Push plate; 602. Limiting post; 603. Top plate; 604. Pad; 7. First fixed plate; 8. Third fixed plate; 9. Second fixed plate; 10. Fourth fixed plate; 11. First sliding plate; 12. Second sliding plate; 13. Third sliding plate; 14. Fourth sliding plate; 15. Guide plate; 16. Guide groove; 17. Guide component; 18. Linkage plate; 19. First hydraulic cylinder; 20. Rear support; 21. Guide rod; 22. Front support; 23. Fixed mold; 24. Second hydraulic cylinder; 25. Buffer pad. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please refer to the following: Figures 1 to 4 A lightweight bottle neck mold with high sealing performance includes a left slider 1, a right slider 2, and a core 3. The left slider 1 and right slider 2 serve as core-pulling components for the bottle neck. When the mold is closed, they cooperate to hold the core 3 tightly, forming a complete molding cavity for the outer wall of the bottle neck. When the mold is opened, the left slider 1 and right slider 2 slide laterally to separate from the bottle neck threads and undercut structure, ensuring that the product can be demolded without damage. They are key moving parts that determine the outer diameter of the bottle neck and the accuracy of the parting surface. Bottle neck mechanisms 4 are provided on the inner sidewalls of the left slider 1 and right slider 2. The rear ends of several cores 3 are threadedly connected to core plates 5. The core plates 5 serve as the fixed base for the cores 3. The multiple cores 3 are firmly integrated into one body through the rear threaded connection, ensuring that each core 3 can maintain accurate position when subjected to high-pressure injection impact. At the same time, it serves as the mounting carrier for the limiting mechanism 6 and the guide plate 15, playing a supporting and positioning role. The limiting mechanism 6 is provided on the front side of the core plate 5.

[0019] The bottle neck mechanism 4 includes multiple arc grooves 401 formed on the inner sidewalls of the left slider 1 and the right slider 2. Vertical grooves 402 are axially spaced on the surface of the core 3. An arc protrusion 403 is fixedly connected to the middle of the vertical groove 402. The arc grooves 401 are used to form the sealing threads of the outer wall of the bottle neck, and the interruption of the sealing threads of the outer wall of the bottle neck between adjacent arc grooves 401 is used to reduce the overall material usage of the bottle neck, making the overall bottle neck lighter. The vertical grooves 402 and the arc protrusion 403 are used to form the axial reinforcing ribs inside the bottle neck. While achieving material lightness, the torsional strength and structural rigidity of the bottle neck are effectively improved.

[0020] The limiting mechanism 6 includes a push plate 601 disposed on the front of the core plate 5, a limiting post 602 threadedly connected to the rear center of the core plate 5, a top plate 603 fixedly connected to the rear side of the core plate 5, and pads 604 fixedly connected to the center of both the top plate 603 and the core plate 5. The push plate 601 is used to install and push each sliding fixed plate to realize the opening and closing action. The pads 604 physically limit the forward and backward limit positions of the push plate 601 to prevent the slider from moving excessively. The top plate 603 and the pads 604 are used to connect to the hydraulic drive source and transmit power, while providing rigid limiting support during mold closing and mold opening.

[0021] A first fixing plate 7 and a third fixing plate 8 are threadedly connected to the rear sides of several left sliders 1, and a second fixing plate 9 and a fourth fixing plate 10 are threadedly connected to the rear sides of several right sliders 2. The first fixing plate 7 and the fourth fixing plate 10 are symmetrically arranged on the front side of the push plate 601, and the second fixing plate 9 and the third fixing plate 8 are symmetrically arranged on the front side of the push plate 601. The first fixing plate 7, the second fixing plate 9, the third fixing plate 8 and the fourth fixing plate 10 are respectively connected to the rear sides of the left sliders 1 and the right sliders 2, serving as a connecting bridge between the sliders and the sliding drive mechanism. They fix each slider in a group to ensure that the sliders on the same side can move linearly in the same direction synchronously, and evenly bear the lateral expansion force when the mold is closed, maintaining the overall rigidity of the left slider 1 and right slider 2 groups.

[0022] The first fixed plate 7 and the third fixed plate 8 are respectively threaded to the upper and lower rear ends of the first sliding plate 11 and the second sliding plate 12. The second fixed plate 9 and the fourth fixed plate 10 are respectively threaded to the upper and lower rear ends of the third sliding plate 13 and the fourth sliding plate 14. The first sliding plate 11, the second sliding plate 12, the third sliding plate 13 and the fourth sliding plate 14 are all slidably connected to the front of the push plate 601. The first fixed plate 7 and the third fixed plate 8 are threaded to the upper and lower rear ends of the first sliding plate 11 and the second sliding plate 12. The second fixed plate 9 and the fourth fixed plate 10 are threaded to the upper and lower rear ends of the third sliding plate 13 and the fourth sliding plate 14. The four sliding plates serve as guide sliding components, constraining the movement trajectory of each fixed plate in the plane direction of the push plate 601, ensuring that the left slider 1 and the right slider 2 can slide smoothly along a precise straight path during the mold opening and closing process, avoiding jamming or bottle mouth damage caused by skew.

[0023] Guide plates 15 are threadedly connected to the upper and lower ends of the front side of the core plate 5. Guide grooves 16 are opened on the opposite sides of the two guide plates 15. Guide members 17 that are adapted to the guide grooves 16 are rotatably connected to the upper and lower sides of the second fixed plate 9 and the third fixed plate 8. The guide plate 15 is fixed to the front side of the core plate 5. The guide groove 16 opened on its inner side is adapted to the guide member 17 that rotates on the fixed plate. With the help of the second hydraulic cylinder 24, the fixed plate on the push plate 601 is pushed to move along the guide groove 16 to realize the separation of the left slider 1 and the right slider 2, and realize the demolding of the bottle mouth thread.

[0024] A linkage plate 18 is fixedly connected to the rear side of the core plate 5, and a first hydraulic cylinder 19 is fixedly connected to the rear side of the linkage plate 18. The linkage plate 18 is fixed to the rear side of the core plate 5 and connected to the first hydraulic cylinder 19. The first hydraulic cylinder 19 serves as the main driving force source for the back-and-forth movement of the core plate 5 and the core 3 system. Through the linkage plate 18, it drives the entire core plate 5 system to move forward and backward along the guide rod 21.

[0025] A rear support 20 is fixedly connected to the rear side of the first hydraulic cylinder 19. Four guide rods 21 are symmetrically fixedly connected to the front side of the rear support 20. A front support 22 is fixedly connected to the front side of the guide rods 21. A fixed mold 23 is fixedly connected to the rear side of the front support 22. A groove adapted to the core 3 is opened on the rear side of the fixed mold 23. The rear support 20 and the front support 22 serve as the overall support frame of the mold. The four symmetrically fixed guide rods 21 form a high-rigidity guide column structure. This combination not only provides a stable guide track for the reciprocating sliding of the linkage plate 18, the top plate 603 and the core plate 5, but also ensures the parallelism and perpendicularity under large stroke movement, effectively reducing the friction and wear of moving parts and extending the mold life.

[0026] A second hydraulic cylinder 24 is fixedly connected to the rear side of the top plate 603 and is fixedly connected to the linkage plate 18. The linkage plate 18, the top plate 603 and the core plate 5 are all slidably connected to the surface of the guide rod 21. A buffer pad 25 is fixedly connected to the surface of the pad 604. A groove adapted to the pad 604 is opened in the middle of the rear side of the push plate 601. The second hydraulic cylinder 24 serves as the power source for the limiting mechanism 6 and the lateral core pulling of the slider. It drives each slider to open and close along the guide groove 16 by pushing the top plate 603 and the push plate 601. It works in coordination with the first hydraulic cylinder 19 to realize the core pulling and ejection or compound sequential action, ensuring that the lightweight thin-walled structure of the bottle mouth is subjected to uniform force during demolding and does not deform or tear.

[0027] The molding process of a lightweight mold for a high-sealing bottle neck is characterized by the following steps: S1. Mold Closure and Injection Molding: The left slider 1 and right slider 2 are closed and clamped to the core 3, so that the arc grooves 401 on the inner sidewalls of the left slider 1 and right slider 2, together with the vertical grooves 402 and arc protrusions 403 on the surface of the core 3, form a bottle mouth forming cavity. Injection molding material is injected into the forming cavity to form a bottle mouth blank. Among them, the arc grooves 401 are used to form the sealing threads on the outer wall of the bottle mouth, and the interruption structure between adjacent arc grooves 401 is used to reduce the amount of bottle mouth material used. The vertical grooves 402 and arc protrusions 403 are used to form the axial reinforcing ribs on the inner wall of the bottle mouth. S2. Cooling and Shaping: Cooling the bottle neck blank inside the molding cavity to solidify and shape it; S3, Lateral core pulling and thread removal: The second hydraulic cylinder 24 is activated, and the push plate 601 is pushed forward through the top plate 603 and the pad block 604. This drives the first sliding plate 11, the second sliding plate 12, the third sliding plate 13 and the fourth sliding plate 14 to slide along the front of the push plate 601. This causes the first fixed plate 7, the second fixed plate 9, the third fixed plate 8 and the fourth fixed plate 10 and the corresponding left slider 1 and right slider 2 to slide laterally along the guide groove 16 of the guide plate 15, so that the left slider 1 and the right slider 2 separate from the sealing threads on the outer wall of the bottle mouth, completing the thread demolding. At the same time, the pad block 604 limits the forward limit position of the push plate 601 to prevent the slider from moving excessively. S4. Core plate retraction: Start the first hydraulic cylinder 19, which drives the core plate 5 and the core 3 to retract axially along the guide rod 21 through the linkage plate 18, so that the core 3 is pulled out from the inner wall of the bottle mouth blank; S5. Ejection and removal: The ejection mechanism ejects the molded bottle neck product from the mold, completing the demolding and removal process. S6. Reset and mold closing: The second hydraulic cylinder 24 drives the push plate 601 to retreat and reset, the first hydraulic cylinder 19 pushes the core plate 5 and the core 3 forward and reset, the left slider 1 and the right slider 2 re-close the mold and hold the core 3, and enter the next injection cycle.

[0028] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A lightweight mold for a high-sealing bottle mouth, comprising a left slider (1), a right slider (2), and a core (3), characterized in that, The inner walls of the left slider (1) and the right slider (2) are provided with bottle mouth mechanisms (4), and the rear ends of several cores (3) are threadedly connected to core plates (5). The front side of the core plates (5) is provided with limit mechanisms (6). The bottle mouth mechanism (4) includes multiple arc grooves (401) formed on the inner sidewalls of the left slider (1) and the right slider (2). Vertical grooves (402) are formed on the surface of the core (3) at equal intervals along the axial direction. An arc protrusion (403) is fixedly connected to the middle of the vertical groove (402). The limiting mechanism (6) includes a push plate (601) disposed on the front of the core plate (5), a limiting post (602) threadedly connected to the rear middle of the core plate (5), a top plate (603) fixedly connected to the rear side of the core plate (5), and a pad (604) fixedly connected to both the top plate (603) and the center of the core plate (5).

2. The lightweight mold for a high-sealing bottle mouth according to claim 1, characterized in that, The rear sides of several left sliders (1) are respectively threaded with a first fixing plate (7) and a third fixing plate (8), and the rear sides of several right sliders (2) are respectively threaded with a second fixing plate (9) and a fourth fixing plate (10). The first fixing plate (7) and the fourth fixing plate (10) are symmetrically arranged on the front side of the push plate (601), and the second fixing plate (9) and the third fixing plate (8) are symmetrically arranged on the front side of the push plate (601).

3. The lightweight mold for a high-sealing bottle mouth according to claim 2, characterized in that, The first fixed plate (7) and the third fixed plate (8) are respectively threaded to the upper and lower ends of the rear side of the first sliding plate (11) and the second sliding plate (12). The second fixed plate (9) and the fourth fixed plate (10) are respectively threaded to the upper and lower ends of the rear side of the third sliding plate (13) and the fourth sliding plate (14). The first sliding plate (11), the second sliding plate (12), the third sliding plate (13) and the fourth sliding plate (14) are all slidably connected to the front side of the push plate (601).

4. The lightweight mold for a high-sealing bottle mouth according to claim 2, characterized in that, The core plate (5) has guide plates (15) threadedly connected to the upper and lower ends of the front side. Guide grooves (16) are opened on the opposite sides of the two guide plates (15). Guide members (17) that are compatible with the guide grooves (16) are rotatably connected to the upper and lower sides of the second fixing plate (9) and the third fixing plate (8).

5. A lightweight mold for a high-sealing bottle neck according to claim 1, characterized in that, A linkage plate (18) is fixedly connected to the rear side of the core plate (5), and a first hydraulic cylinder (19) is fixedly connected to the rear side of the linkage plate (18).

6. The lightweight mold for a high-sealing bottle neck according to claim 5, characterized in that, The rear side of the first hydraulic cylinder (19) is fixedly connected to a rear bracket (20). The front side of the rear bracket (20) is symmetrically fixedly connected to four guide rods (21). The front side of the guide rods (21) is fixedly connected to a front bracket (22). The rear side of the front bracket (22) is fixedly connected to a fixed mold (23). The rear side of the fixed mold (23) is provided with a groove that matches the core (3).

7. The lightweight mold for a high-sealing bottle neck according to claim 1, characterized in that, The rear side of the top plate (603) is fixedly connected to a second hydraulic cylinder (24) which is fixedly connected to the linkage plate (18). The linkage plate (18), the top plate (603) and the core plate (5) are all slidably connected to the surface of the guide rod (21). The surface of the pad (604) is fixedly connected to a buffer pad (25). The rear middle of the push plate (601) is provided with a groove that matches the pad (604).

8. A molding process for a lightweight mold with high sealing performance for bottle necks as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Mold Closure and Injection Molding: The left slider (1) and right slider (2) are closed and the core (3) is held tightly. The arc groove (401) on the inner sidewall of the left slider (1) and right slider (2) together with the vertical groove (402) and arc protrusion (403) on the surface of the core (3) form the bottle mouth forming cavity. Injection molding material is injected into the forming cavity to form the bottle mouth blank. The arc groove (401) is used to form the sealing thread of the outer wall of the bottle mouth. The interruption structure between adjacent arc grooves (401) is used to reduce the amount of bottle mouth material. The vertical groove (402) and arc protrusion (403) are used to form the axial reinforcing ribs of the inner wall of the bottle mouth. S2. Cooling and Shaping: Cooling the bottle neck blank inside the molding cavity to solidify and shape it; S3, Lateral core pulling and thread removal: The second hydraulic cylinder (24) is activated, and the push plate (601) is pushed forward by the top plate (603) and the pad block (604). The first sliding plate (11), the second sliding plate (12), the third sliding plate (13) and the fourth sliding plate (14) slide along the front of the push plate (601), which drives the first fixed plate (7), the second fixed plate (9), the third fixed plate (8) and the fourth fixed plate (10) and the corresponding left slider (1) and right slider (2) to slide laterally along the guide groove (16) of the guide plate (15), so that the left slider (1) and the right slider (2) are separated from the sealing threads of the outer wall of the bottle mouth, and the thread demolding is completed. At the same time, the push plate (601) is limited to the forward limit position by the pad block (604) to prevent the slider from moving excessively. S4, Core plate retraction: Start the first hydraulic cylinder (19), and drive the core plate (5) and the core (3) to retract axially along the guide rod (21) through the linkage plate (18), so that the core (3) is pulled out from the inner wall of the bottle mouth blank; S5. Ejection and removal: The ejection mechanism ejects the molded bottle neck product from the mold, completing the demolding and removal process. S6, Reset and Mold Closure: The second hydraulic cylinder (24) drives the push plate (601) to retreat and reset, the first hydraulic cylinder (19) pushes the core plate (5) and the core (3) forward and reset, the left slider (1) and the right slider (2) re-close the mold and hold the core (3), and enter the next injection cycle.

Images