Cooling device for bottle cap injection molding
By optimizing the structure of the bottle cap injection cooling device, especially the design and material selection of the water tank inside the ejector pin, the problem of cooling water not being able to completely cover the top of the mold core was solved, achieving rapid cooling and efficient production, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG BODER TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-08
AI Technical Summary
Traditional bottle cap molds have a long distance between the cooling water holes and the top of the mold core, which means that the cooling water cannot be completely covered. This results in the bottle caps not cooling down quickly during production, which can easily lead to problems such as the caps popping up, breaking, or deforming. In addition, the production cycle is extended and productivity is reduced.
A cooling device for bottle cap injection molding was designed. By setting a water tank inside the ejector pin, the cooling water is brought closer to the product glue position and circulates, shortening the cooling time. The device includes an optimized structure of fixed mold, ejector pin, insert, water separator and moving mold plate, and is made of cast iron to improve wear resistance and corrosion resistance.
It enables rapid cooling of bottle caps, shortens the cooling time of injection molding machines, improves production efficiency, reduces defects, and saves production costs.
Smart Images
Figure CN224210470U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold design technology, specifically a cooling device for bottle cap injection molding. Background Technology
[0002] Traditional bottle cap mold cooling water systems use water-separating plates to divide the cooling water holes, allowing cooling water to reach the top of the mold core. During processing, the cooling water holes need to maintain a safe distance of 13mm from the top of the mold core to prevent excessive machining that could cause the mold core to crack. Because there is a safe distance between the cooling water holes and the top of the mold core, the cooling water cannot completely cover the top of the mold core, resulting in the bottle cap not cooling quickly during production. This can easily lead to issues such as the cap lifting too high, breaking, or deforming. It is necessary to adjust the injection molding machine parameters and lengthen the cooling time during injection to ensure the production yield. This results in a longer mold production cycle, reduced productivity, and wasted production resources. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides a cooling device for bottle cap injection molding, which solves the problem that the distance between the existing cooling water holes and the top of the mold core is too long, and the cooling water cannot completely cover the top of the mold core, resulting in the bottle cap not being able to cool quickly during production, and the bottle cap being prone to problems such as tipping, breaking, and deformation.
[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0005] This utility model provides a cooling device for bottle cap injection molding, comprising: a fixed mold, wherein a pouring gate is provided in the middle of the upper part of the fixed mold, and a hollow push rod with openings at both the upper and lower ends is provided in the lower part of the fixed mold. An insert is connected to the upper part of the push rod, and a hole is provided in the insert. A water-blocking plate is connected in the middle of the push rod, and the upper end of the water-blocking plate is connected to the middle of the insert. An interface with openings on both the left and right sides is connected to the lower opening of the push rod, and a water-blocking plate is also connected inside the interface. The water-blocking plate inside the interface is fixedly connected to the water-blocking plate inside the push rod. A movable template is sleeved on the outer side of the upper end of the push rod, and an outer movable template is connected to the outer side of the movable template. The outer side of the outer movable template is in close contact with the inner side of the movable template, and the upper end of the outer movable template is in close contact with the opening at the lower end of the fixed mold.
[0006] Preferably, positioning bosses are provided around the upper outer edge of the top rod, around the upper outer edge of the moving template, and around the upper outer edge of the outer moving template.
[0007] Preferably, a sealing ring is connected to both the inner circumference of the upper end of the moving template and the lower circumference of the inner end of the outer moving template.
[0008] Preferably, the outer side of the upper end of the push rod and the inner side of the upper end of the moving template are inclined slopes, and the contact point between the lower end of the interior of the fixed mold and the outer side of the upper end of the outer moving template is also an inclined slope.
[0009] Preferably, cooling pipes are provided on both the left and right sides of the upper end of the fixed mold.
[0010] Preferably, the fixed mold, ejector pin, insert, water-blocking plate, moving template, and outer moving template are all made of cast iron.
[0011] Preferably, the insert and the top rod are fixedly connected by welding or 3D printing.
[0012] Compared with the prior art, the present invention has at least the following beneficial effects:
[0013] This cooling device for bottle cap injection molding uses a system where cooling water flows through holes into the ejector pin. The ejector pin contains a circular water trough, extending 3.6mm above the product's injection point. After circulating once at the top, the cooling water returns to another hole in the insert and flows out. Because the cooling water is close to the product's injection point and circulates rapidly, it quickly cools the product, shortening the injection molding machine's cooling time, improving production efficiency, reducing defects caused by insufficient cooling time, and saving production costs.
[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0015] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This is a view of the mold of this utility model with the mold removed;
[0018] Figure 3 This is a drawing showing the removal of parts from the injection molded part according to this utility model;
[0019] Figure 4 This is the isometric drawing of the top rod of this utility model.
[0020] In the diagram: 1. Fixed mold; 2. Sprue; 3. Ejector pin; 4. Insert; 5. Water barrier; 6. Interface; 7. Moving mold plate; 8. Outer moving mold plate; 21. Positioning boss; 22. Sealing ring; 23. Cooling pipe. Detailed Implementation
[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] Please see Figure 1-4 This utility model provides a technical solution: a cooling device for bottle cap injection molding, comprising: a fixed mold 1, a pouring gate 2 opened in the middle of the upper end of the fixed mold 1, a hollow push rod 3 with openings at both the upper and lower ends provided at the lower end of the fixed mold 1, an insert 4 connected to the upper end of the push rod 3, a hole opened in the insert 4, a water-blocking plate 5 connected in the middle of the push rod 3, the upper end of the water-blocking plate 5 connected to the middle of the insert 4, an interface 6 with openings on both the left and right sides connected to the lower opening of the push rod 3, a water-blocking plate 5 also connected to the interface 6, the water-blocking plate 5 inside the interface 6 being fixedly connected to the water-blocking plate 5 inside the push rod 3, a movable template 7 sleeved on the outer side of the upper end of the push rod 3, an outer movable template 8 connected to the outer side of the movable template 7, the outer side of the outer movable template 8 being tightly fitted to the inner side of the movable template 7, and the upper end of the outer movable template 8 being tightly fitted to the opening at the lower end of the fixed mold 1.
[0024] During use, the ejector pin 3, moving platen 7, and outer moving platen 8 are pushed together towards the fixed mold 1, forming a gating cavity at the lower end of the fixed mold 1. The gating port 2 at the upper end of the fixed mold 1 is connected to the discharge port of the injection molding machine. The molten plastic enters the gating cavity formed by the ejector pin 3, moving platen 7, outer moving platen 8, and fixed mold 1 through the gating port 2. After pressure holding, cooling water flows into the ejector pin 3 through the interface 6. Due to the water baffle 5, the cooling water enters the left side of the ejector pin 3. The upper end of the ejector pin 3 and the insert 4 form a water groove. The water groove can be 3.6mm above the gating cavity. After the cooling water flows to the top and circulates once, it flows out through the hole of the insert 4, enters the right side of the ejector pin 3, and finally flows out through the interface 6. Because the cooling water is close to the gating cavity and circulates, it can quickly cool the product. During production, it can shorten the cooling time of the injection molded parts, improve production efficiency, reduce defects caused by insufficient cooling time, and save production costs.
[0025] like Figure 1-3 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, positioning bosses 21 are provided on the outer circumference of the upper end of the top rod 3, the outer circumference of the upper end of the moving template 7, and the outer circumference of the upper end of the outer moving template 8.
[0026] Analysis of the above structure shows that when the moving template 7 and the outer moving template 8 are pushed upward, the positioning boss 21 can play a limiting role, which facilitates positioning.
[0027] like Figure 1-2 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, a sealing ring 22 is connected to the inner circumference of the upper end of the moving template 7 and the lower circumference of the inner end of the outer moving template 8.
[0028] Analysis of the above structure shows that the sealing rings 22 on the inner side of the upper end of the moving template 7 and the lower side of the inner side of the outer moving template 8 can improve the sealing of the mold cavity, ensure the internal pressure, and prevent molten plastic from flowing out through the connection.
[0029] like Figure 1-2 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, the outer side of the upper end of the push rod 3 and the inner side of the upper end of the moving template 7 are inclined slopes, and the contact point between the lower inner end of the fixed mold 1 and the outer side of the upper end of the outer moving template 8 is also an inclined slope.
[0030] Analysis of the above structure shows that the outer side of the upper end of the push rod 3 and the inner side of the upper end of the moving template 7, as well as the lower end of the interior of the fixed mold 1 and the outer side of the upper end of the outer moving template 8, are all inclined surfaces. This can improve the sealing of the contact position, and at the same time, it squeezes inward when in contact, reducing the error during the bonding process.
[0031] like Figure 1 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, cooling pipes 23 are provided on both the left and right sides of the upper end of the fixed mold 1.
[0032] Analysis of the above structure shows that the cooling pipes 23 on the left and right sides of the upper end of the fixed mold 1 can help cool the upper end of the injection molded part.
[0033] like Figure 1-4 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, the fixed mold 1, the ejector rod 3, the insert 4, the water-blocking plate 5, the moving template 7, and the outer moving template 8 are all made of cast iron.
[0034] Analysis of the above structure shows that the fixed mold 1, ejector pin 3, insert 4, water-blocking plate 5, moving mold plate 7 and outer moving mold plate 8 are all made of cast iron, which can improve the wear resistance, corrosion resistance and high temperature resistance of the mold.
[0035] like Figure 1-3 As shown, this utility model embodiment provides an implementation method in which the insert 4 and the top rod 3 are fixedly connected by welding or 3D printing.
[0036] Analysis of the above structure shows that the insert 4 and the top rod 3 are fixedly connected by welding or 3D printing, which facilitates drilling inside the insert 4.
[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A cooling device for injection molding bottle caps, characterized in that, include: A fixed mold (1) has a pouring gate (2) in the middle of its upper interior. A hollow ejector pin (3) with openings at both the top and bottom is provided at the lower end of the fixed mold (1). An insert (4) is connected to the upper interior of the ejector pin (3). A hole is provided inside the insert (4). A water-blocking plate (5) is connected to the middle of the ejector pin (3). The upper end of the water-blocking plate (5) is connected to the middle of the insert (4). A hollow ejector pin with openings on both the left and right sides is connected to the lower opening of the ejector pin (3). An open interface (6) is provided, and a water-blocking plate (5) is also connected inside the interface (6). The water-blocking plate (5) inside the interface (6) is fixedly connected to the water-blocking plate (5) inside the push rod (3). A movable template (7) is sleeved on the outer side of the upper end of the push rod (3). An outer movable template (8) is connected to the outer side of the movable template (7). The outer side of the outer movable template (8) is tightly fitted to the inner side of the movable template (7). The upper end of the outer movable template (8) is tightly fitted to the opening at the lower end of the fixed mold (1).
2. The cooling device for bottle cap injection molding according to claim 1, characterized in that: Positioning bosses (21) are provided around the upper outer edge of the top rod (3), around the upper outer edge of the moving template (7), and around the upper outer edge of the outer moving template (8).
3. A cooling device for bottle cap injection molding according to claim 1, characterized in that: The upper inner side of the moving template (7) and the lower inner side of the outer moving template (8) are both connected with sealing rings (22).
4. A cooling device for bottle cap injection molding according to claim 1, characterized in that: The outer side of the upper end of the top rod (3) and the inner side of the upper end of the moving template (7) are inclined slopes, and the contact point between the lower inner end of the fixed mold (1) and the outer side of the upper end of the moving template (8) is also an inclined slope.
5. A cooling device for bottle cap injection molding according to claim 1, characterized in that: Cooling pipes (23) are provided on both the left and right sides of the upper end of the fixed mold (1).
6. A cooling device for bottle cap injection molding according to claim 1, characterized in that: The fixed mold (1), ejector pin (3), insert (4), water-blocking plate (5), moving template (7) and outer moving template (8) are all made of cast iron.
7. A cooling device for bottle cap injection molding according to claim 1, characterized in that: The insert (4) and the top rod (3) are fixedly connected by welding or 3D printing.