Injection mold for bottle preforms based on a single mold with multiple cavities

Abstract

The utility model belongs to mould technical field especially relates to a bottle blank injection mold based on one mould multi -cavity. The utility model, including bottle blank forming lower mould and bottle blank forming upper mould, be equipped with injection molding shunt spare on bottle blank forming upper mould, be equipped with bottle blank forming outer sleeve spare in bottle blank forming upper mould. The utility model in the using process, through the cooperation of bottle blank forming outer sleeve spare, bottle blank forming inner tube structure and combined bottle blank bottom forming assembly, realize one injection molding synchronous forming 4 bottle blank plastic parts, compared with traditional single cavity or a small number of cavity mould, production efficiency is greatly promoted, and the positioning and cooperation precision between each part are accurate, such as the steady clamping of clamping fixing spare to bottom forming assembly, the orientation of anti -deflection limit side plate to upper and lower mould etc.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a preform injection mold based on a multi-cavity mold. Background Technology

[0002] In the production of plastic preforms, injection molds are crucial molding equipment. Traditional preform injection molds often employ single-cavity or few-cavity designs, producing only one or a few preforms per injection cycle, resulting in low production efficiency and failing to meet the demands of large-scale industrial production. Furthermore, some multi-cavity molds suffer from complex structures and difficulties in mold opening and removal, increasing operational complexity and increasing the risk of product damage, further reducing production efficiency. Simultaneously, the molding structure of traditional molds lacks precision control and stability, easily leading to dimensional deviations and appearance defects in the preforms. Therefore, there is an urgent need to design a multi-cavity preform injection mold that can overcome these shortcomings.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses a preform mold [application number: 201910140782.1], which includes a nozzle, a needle valve inserted into the nozzle, a cavity bottom plate detachably connected to the nozzle, a cavity fixing plate connected to the cavity bottom plate, and a half block connected to the cavity fixing plate; a cavity is formed between the cavity bottom plate, the cavity fixing plate, and the half block; the top of the cavity bottom plate is provided with a cavity inlet communicating with the cavity; one end of the needle valve passes through the nozzle and is located above the cavity inlet; the preform mold also includes a core; the core includes a fixing part and a core part; the core part is inserted into the cavity; the fixing part is connected to the half block; a water pipe is provided inside the core; a water core is provided in the water pipe; and a gap is provided between the water core and the inner wall of the water pipe. However, this method still cannot mold multiple preforms at once during the injection molding process, and the product is easily damaged when the mold is opened, resulting in high operational difficulty and low production efficiency. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a preform injection mold based on a multi-cavity mold.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A preform injection mold based on a multi-cavity mold includes a lower preform forming mold and an upper preform forming mold. An injection diverter is provided above the upper preform forming mold. An outer preform forming sleeve is provided inside the upper preform forming mold. An inner preform forming cylinder structure extending into the outer preform forming sleeve and a bottom sleeve for fixing the inner preform forming cylinder structure are provided inside the lower preform forming mold and the upper preform forming mold. A combined preform bottom forming assembly is provided between the lower and upper preform forming molds. The inner preform forming cylinder structure passes through the combined preform bottom forming assembly, and the combined preform bottom forming assembly corresponds in position and shape to the outer preform forming sleeve. A clamping and fixing member is provided between the combined preform bottom forming assembly and the lower preform forming mold. The top of the clamping and fixing member abuts against the combined preform bottom forming assembly, and the bottom abuts against the lower preform forming mold.

[0007] In the above-mentioned preform injection mold based on a multi-cavity mold, the preform forming outer sleeve includes four preform forming outer sleeves disposed in the preform forming lower mold, each preform forming outer sleeve having a downward-opening forming cavity, and the preform forming inner sleeve structure extending into the forming cavity.

[0008] In the above-mentioned preform injection mold based on a multi-cavity mold, the preform forming inner cylinder structure includes four fixed bases and a preform forming inner cylinder body disposed in the lower mold of the preform forming. The fixed bases and the preform forming inner cylinder body are integrally formed, and the preform forming inner cylinder body extends into the forming cavity.

[0009] In the above-mentioned preform injection mold based on a multi-cavity mold, the bottom sleeve component includes four bottom fixing sleeves disposed in the lower mold for preform forming, and the fixing base passes through the bottom fixing sleeves and fits against the bottom fixing sleeves.

[0010] In the above-mentioned preform injection mold based on a multi-cavity mold, a fixed base plate is provided below the preform forming lower mold, and a positioning shaft is provided at the bottom of the fixed base plate, and the positioning shaft is engaged with the fixed base plate.

[0011] In the above-mentioned preform injection mold based on a multi-cavity mold, the combined preform bottom forming component includes four left auxiliary clamping blocks, right auxiliary clamping blocks, and forming sleeve blocks disposed between the lower preform forming mold and the upper preform forming mold. The left auxiliary clamping blocks, right auxiliary clamping blocks, and forming sleeve blocks together form the preform bottom forming cavity.

[0012] In the above-mentioned preform injection mold based on a multi-cavity mold, the clamping and fixing components include two clamping plates disposed above the preform forming lower mold. The top of the clamping plates abuts against the bottom of the left auxiliary clamping block and the right auxiliary clamping block, and the bottom abuts against the top of the preform forming lower mold. The clamping inner wall formed by the two clamping plates is engaged with the bottom fixing sleeve.

[0013] In the above-mentioned preform injection mold based on a multi-cavity mold, the injection diversion component includes an injection main plate and an injection diversion plate disposed above the preform forming upper mold, and the injection diversion plate is provided with four injection tubes at the bottom.

[0014] In the above-mentioned preform injection mold based on a multi-cavity mold, an injection tube fixing plate is provided between the injection manifold and the preform forming upper mold, and four injection tubes pass through the injection tube fixing plate.

[0015] In the above-mentioned preform injection mold based on a multi-cavity mold, two anti-deviation limiting side plates are provided between the preform forming lower mold and the preform forming upper mold. One end of the anti-deviation limiting side plate is fixed to the preform forming lower mold, and the other end is slidably engaged with the preform forming upper mold.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. In use, this utility model achieves simultaneous molding of four preform plastic parts in one injection by combining the preform molding outer kit, the preform molding inner cylinder structure, and the combined preform bottom molding component. Compared with traditional single-cavity or few-cavity molds, the production efficiency is greatly improved.

[0018] 2. The overall structure of this utility model is reasonably designed, which makes it easy to open the mold and remove the product after injection molding, reducing product damage and production stoppage caused by demolding difficulties, and further improving production efficiency and product qualification rate.

[0019] 3. The positioning and coordination between the various components in this utility model are precise. For example, the clamping and fixing parts provide a stable clamping for the bottom molding component, and the anti-deviation limiting side plate guides the upper and lower molds. This ensures the stability of the mold during the injection molding process and improves the molding accuracy and quality of the preform.

[0020] 4. The modular preform bottom forming component in this utility model adopts a segmented design, which makes it easy to disassemble and replace when wear or damage occurs, thus reducing the maintenance cost and maintenance time of the mold.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a partial structural schematic diagram of the present invention.

[0024] Figure 3 This is a partial structural schematic diagram of another aspect of this utility model.

[0025] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0026] In the diagram: 1. Lower mold for preform forming; 2. Upper mold for preform forming; 3. Injection flow divider; 4. Outer sleeve for preform forming; 5. Inner cylinder structure for preform forming; 6. Bottom sleeve; 7. Combined bottom preform forming assembly; 8. Clamping and fixing component; 9. Outer sleeve for preform forming; 10. Fixed base; 11. Inner cylinder for preform forming; 12. Bottom fixing sleeve; 13. Fixed base plate; 14. Positioning shaft; 15. Left auxiliary clamping block; 16. Right auxiliary clamping block; 17. Forming sleeve block; 18. Clamping plate; 19. Main injection plate; 20. Injection flow divider plate; 21. Injection tube; 22. Injection tube fixing plate; 23. Anti-deviation limiting side plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-4 As shown, a preform injection mold based on a multi-cavity mold includes a preform forming lower mold 1 and a preform forming upper mold 2. An injection diverter 3 is provided above the preform forming upper mold 2. A preform forming outer sleeve 4 is provided inside the preform forming upper mold 2. A preform forming inner cylinder structure 5 extending into the preform forming outer sleeve 4 and a bottom sleeve 6 for fixing the preform forming inner cylinder structure 5 are provided inside the preform forming lower mold 1 and the preform forming upper mold 2. A combined preform bottom forming component 7 is provided between the preform forming lower mold 1 and the preform forming upper mold 2. The preform forming inner cylinder structure 5 passes through the combined preform bottom forming component 7, and the combined preform bottom forming component 7 is positioned and shaped to match the preform forming outer sleeve 4. A clamping and fixing component 8 is provided between the combined preform bottom forming component 7 and the preform forming lower mold 1. The top of the clamping and fixing component 8 abuts against the combined preform bottom forming component 7, and the bottom abuts against the preform forming lower mold 1.

[0029] In this embodiment, an injection flow divider 3 is provided above the upper preform forming mold 2 to evenly distribute the injection molding material to each mold cavity. An outer preform forming sleeve 4 is provided inside the upper preform forming mold 2. The inner preform forming cylinder structure 5 inside the lower preform forming mold 1 extends into the outer preform forming sleeve 4. The two work together to form the main preform forming space. A bottom sleeve 6 is used to fix the bottom of the inner preform forming cylinder structure 5 to ensure its stability. A combined preform bottom forming assembly 7 is provided between the lower preform forming mold 1 and the upper preform forming mold 2. The inner cylinder structure 5 runs through the component, and the component corresponds to the position and shape of the preform forming outer kit 4, thereby completely forming the bottom of the preform. The top of the clamping and fixing part 8 abuts against the combined preform bottom forming component 7, and the bottom abuts against the preform forming lower mold 1, which plays a stable clamping role for the combined preform bottom forming component 7 and prevents displacement during injection molding. Through the cooperation of these parts, the function of multi-cavity synchronous injection molding is realized. Compared with traditional molds, four preforms can be formed in one injection, and the production efficiency is significantly improved.

[0030] Combination Figure 1-4 As shown, the preform forming outer sleeve 4 includes four preform forming outer sleeves 9 disposed in the preform forming lower mold 1. Each preform forming outer sleeve 9 has a forming cavity with an opening facing downwards, and the preform forming inner sleeve structure 5 extends into the forming cavity.

[0031] Specifically, each preform forming outer sleeve 9 has a downward-opening forming cavity, and the preform forming inner sleeve structure 5 extends into the forming cavity. The gap between the two forms the annular wall thickness space of the preform. The design of four preform forming outer sleeves 9 realizes a four-cavity layout in one mold, which enables four preforms to be formed at the same time in one injection molding, greatly improving production efficiency. At the same time, the independent forming cavity design ensures the forming accuracy of each preform and avoids mutual interference between multiple cavities.

[0032] The preform forming inner cylinder structure 5 includes four fixed bases 10 and a preform forming inner cylinder 11 disposed in the preform forming lower mold 1. The fixed bases 10 and the preform forming inner cylinder 11 are integrally formed, and the preform forming inner cylinder 11 extends into the forming cavity.

[0033] In this embodiment, the preform forming inner cylinder 11 extends into the forming cavity of the preform forming outer cylinder 9, and cooperates with the outer cylinder 9 to form the internal and external contours of the preform. The fixed base 10 not only provides stable support for the preform forming inner cylinder 11, but also achieves positioning function through cooperation with other components. The one-piece molding design ensures the strength and stability of the inner cylinder structure 5, avoids deformation under injection pressure, and thus ensures the dimensional accuracy of the preform.

[0034] Combination Figure 3 , Figure 4As shown, the bottom sleeve 6 includes four bottom fixing sleeves 12 disposed in the lower mold 1 for preform forming, and the fixing base 10 passes through the bottom fixing sleeves 12 and fits against the bottom fixing sleeves 12.

[0035] In this embodiment, the bottom fixing sleeve 12 further positions and supports the fixing base 10, enhancing the stability of the preform forming inner cylinder structure 5, enabling it to withstand the impact of high-pressure molten material during injection molding without displacement or deformation, thereby ensuring the molding quality and dimensional accuracy of the preform bottom.

[0036] A fixed base plate 13 is provided below the preform forming lower mold 1, and a positioning shaft 14 is provided at the bottom of the fixed base 10. The positioning shaft 14 is engaged with the fixed base plate 13.

[0037] In this embodiment, a fixed base plate 13 is provided below the preform forming lower mold 1, and a positioning shaft 14 is provided at the bottom of the fixed base 10. The positioning shaft 14 and the fixed base plate 13 are engaged in a snap-fit ​​relationship. This snap-fit ​​relationship further enhances the stability of the preform forming inner cylinder structure 5, ensuring that the relative positions of the mold components remain unchanged during the injection molding process. At the same time, the engagement between the positioning shaft 14 and the fixed base plate 13 also facilitates the installation and disassembly of the mold, improving the ease of use and maintenance efficiency of the mold.

[0038] Combination Figure 3 As shown, the combined preform bottom forming assembly 7 includes four left auxiliary clamping blocks 15, right auxiliary clamping blocks 16 and forming sleeve blocks 17 disposed between the preform forming lower mold 1 and the preform forming upper mold 2. The left auxiliary clamping blocks 15, right auxiliary clamping blocks 16 and forming sleeve blocks 17 together form the preform bottom forming chamber.

[0039] In this embodiment, during the injection molding process, the left auxiliary clamping block 15, the right auxiliary clamping block 16, and the molding sleeve block 17 cooperate with each other to form a complete preform molding space together with the preform molding outer sleeve 4 and the preform molding inner cylinder structure 5. This accurately shapes the bottom of the preform. The modular design allows for individual replacement of any worn or damaged component without requiring a complete mold replacement, reducing maintenance costs. Furthermore, the segmented structure facilitates the removal of the molded preform during mold opening, improving demolding efficiency.

[0040] The clamping and fixing component 8 includes two clamping plates 18 disposed above the preform forming lower mold 1. The top of the clamping plate 18 abuts against the bottom of the left auxiliary clamping block 15 and the right auxiliary clamping block 16, and the bottom abuts against the top of the preform forming lower mold 1. The clamping inner wall formed by the two clamping plates 18 is engaged with the bottom fixing sleeve 12.

[0041] In this embodiment, the clamping plate 18 securely fixes the combined preform bottom forming component 7 to the preform forming lower mold 1 by abutting and snapping, preventing it from shifting due to pressure during injection molding and ensuring the forming accuracy of the preform bottom. At the same time, this clamping method also facilitates the disassembly of the bottom forming component 7 when the mold is opened, making it convenient to remove the preform.

[0042] Combination Figure 1-3 As shown, the injection molding diversion component 3 includes an injection molding main plate 19 and an injection molding diversion plate 20 disposed above the preform forming upper mold 2, and the injection molding diversion plate 20 is provided with four injection tubes 21 at the bottom.

[0043] In this embodiment, the injection molding main board 19 introduces the raw material conveyed by the injection molding machine into the injection molding manifold 20. The injection molding manifold 20 distributes the raw material evenly into the molding cavities of the four preform molding outer sleeves 9 through four injection tubes 21, realizing multi-cavity synchronous injection. This design ensures that the raw material in each mold cavity is filled evenly, avoids the difference in preform quality caused by uneven distribution of raw materials, and improves the consistency and pass rate of the product.

[0044] Combination Figure 1-3 As shown, an injection tube fixing plate 22 is provided between the injection molding diversion plate 20 and the preform forming upper mold 2, and four injection tubes 21 pass through the injection tube fixing plate 22.

[0045] In this embodiment, the injection tube fixing plate 22 fixes and supports the injection tube 21, ensuring the stability of the injection tube 21 during the injection process and preventing the injection tube 21 from shifting due to vibration or pressure. This ensures that the raw materials can be accurately injected into each mold cavity, further improving the precision and stability of injection molding.

[0046] Combination Figure 1-2 As shown, two anti-deviation limiting side plates 23 are provided between the lower mold 1 and the upper mold 2 for preform forming. One end of the anti-deviation limiting side plate 23 is fixed to the lower mold 1 for preform forming, and the other end is slidably engaged with the upper mold 2 for preform forming.

[0047] In this embodiment, during the mold closing process, the anti-deviation limiting side plate 23 provides guidance for the upper mold 2 for preform forming, ensuring accurate alignment of the upper and lower molds and preventing preform forming defects caused by mold deviation. At the same time, the sliding fit design also facilitates the opening and closing operation of the mold, improving the ease of use and production efficiency of the mold.

[0048] The working principle of this utility model is as follows:

[0049] The lower mold 1 and upper mold 2 of the preform forming are closed. The anti-deviation limiting side plate 23 guides and positions the upper mold 2 of the preform forming to ensure accurate alignment of the upper and lower molds. At the same time, the clamping plate 18 of the clamping and fixing component 8 firmly fixes the left auxiliary clamping block 15 and the right auxiliary clamping block 16 of the combined preform bottom forming component 7 onto the lower mold 1 of the preform forming. The injection molding machine delivers the plastic raw material to the injection main plate 19 of the injection flow divider 3, and then distributes it evenly into the forming cavities of the four preform forming outer sleeves 9 through the injection flow divider 20 and four injection tubes 21. The preform forming inner cylinder 11 of the preform forming inner cylinder structure 5 and the preform forming outer sleeve 4 of the preform forming inner cylinder structure 5 are connected. The outer sleeve 9 and the combined preform bottom forming component 7 together form a closed forming space. The raw material fills this space under high pressure to form the shape of the preform. The plastic raw material injected into the mold cavity cools and solidifies in the mold to form the preform plastic part. After the preform cools and solidifies, the preform forming upper mold 2 is opened and the clamping plate 18 of the clamping and fixing component 8 is removed. Since the combined preform bottom forming component 7 adopts a segmented design of left auxiliary clamping block 15, right auxiliary clamping block 16 and forming sleeve block 17, the formed preform can be easily taken out of the mold to complete one injection molding production cycle. Then the next round of mold closing and injection molding operation can be carried out to achieve continuous and efficient preform production.

[0050] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0051] Although this document frequently uses terms such as preform forming lower mold 1, preform forming upper mold 2, injection molding flow divider 3, preform forming outer sleeve 4, preform forming inner cylinder structure 5, bottom sleeve 6, combined preform bottom forming assembly 7, clamping and fixing component 8, preform forming outer sleeve 9, fixing base 10, preform forming inner cylinder 11, bottom fixing sleeve 12, fixing base plate 13, positioning shaft 14, left auxiliary clamping block 15, right auxiliary clamping block 16, forming sleeve block 17, clamping plate 18, injection molding main plate 19, injection molding flow divider 20, injection pipe 21, injection pipe fixing plate 22, anti-deviation limiting side plate 23, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A multi-cavity mold based on a single die for injection molding of preforms, comprising a lower mold (1) for forming preforms and an upper mold (2) for forming preforms, characterized in that, The upper mold (2) for preform forming is provided with an injection flow divider (3). The upper mold (2) for preform forming is provided with a preform forming outer sleeve (4). The lower mold (1) for preform forming is provided with a preform forming inner cylinder structure (5) extending into the preform forming outer sleeve (4) and a bottom sleeve (6) for fixing the preform forming inner cylinder structure (5). A combined preform bottom forming component (7) is provided between the lower mold (1) for preform forming and the upper mold (2) for preform forming. The preform forming inner cylinder structure (5) passes through the combined preform bottom forming component (7), and the combined preform bottom forming component (7) is positioned and matched with the preform forming outer sleeve (4). A clamping and fixing component (8) is provided between the combined preform bottom forming component (7) and the lower mold (1) for preform forming. The top of the clamping and fixing component (8) abuts against the combined preform bottom forming component (7), and the bottom abuts against the lower mold (1) for preform forming.

2. The one-mold multi-cavity based preform injection mold of claim 1, wherein, The preform forming outer sleeve (4) includes four preform forming outer sleeves (9) disposed in the preform forming lower mold (1). The preform forming outer sleeves (9) have a forming cavity with an opening facing downwards. The preform forming inner sleeve structure (5) extends into the forming cavity.

3. The one-mold multi-cavity based preform injection mold of claim 2, wherein, The preform forming inner cylinder structure (5) includes four fixed bases (10) and a preform forming inner cylinder body (11) disposed in the preform forming lower mold (1). The fixed bases (10) and the preform forming inner cylinder body (11) are integrally formed, and the preform forming inner cylinder body (11) extends into the forming cavity.

4. The one-mold multi-cavity based preform injection mold of claim 3, wherein, The bottom sleeve component (6) includes four bottom fixing sleeves (12) disposed in the lower mold (1) for preform forming. The fixing base (10) passes through the bottom fixing sleeves (12) and is in contact with the bottom fixing sleeves (12).

5. The one-mold multi-cavity based preform injection mold of claim 4, wherein, The lower mold (1) for preform forming is provided with a fixed base plate (13) below it, and the bottom of the fixed base (10) is provided with a positioning shaft (14), which is engaged with the fixed base plate (13).

6. The one-mold multi-cavity based preform injection mold of claim 5, wherein, The combined preform bottom forming assembly (7) includes four left auxiliary clamping blocks (15), right auxiliary clamping blocks (16) and forming sleeve blocks (17) disposed between the preform forming lower mold (1) and the preform forming upper mold (2). The left auxiliary clamping blocks (15), right auxiliary clamping blocks (16) and forming sleeve blocks (17) together form the preform bottom forming chamber.

7. The one-mold multi-cavity based preform injection mold of claim 6, wherein, The clamping and fixing component (8) includes two clamping plates (18) disposed above the preform forming lower mold (1). The top of the clamping plate (18) abuts against the bottom of the left auxiliary clamping block (15) and the right auxiliary clamping block (16), and the bottom abuts against the top of the preform forming lower mold (1). The clamping inner wall formed by the two clamping plates (18) is engaged with the bottom fixing sleeve (12).

8. The one-mould multi-cavity based bottle preform injection mould according to any one of claims 1 to 7, characterized in that, The injection molding diversion component (3) includes an injection molding main plate (19) and an injection molding diversion plate (20) disposed above the preform forming upper mold (2), and the injection molding diversion plate (20) has four injection tubes (21) at its bottom.

9. The one-mold multi-cavity based preform injection mold of claim 8, wherein, An injection tube fixing plate (22) is provided between the injection diversion plate (20) and the preform forming upper mold (2), and four injection tubes (21) pass through the injection tube fixing plate (22).

10. The one-mould multi-cavity based bottle preform injection mould according to any one of claims 1 to 7, characterized in that, Two anti-deviation limiting side plates (23) are provided between the lower mold (1) and the upper mold (2) of the preform forming. One end of the anti-deviation limiting side plate (23) is fixed to the lower mold (1) of the preform forming, and the other end is slidably engaged with the upper mold (2) of the preform forming.

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