Blow molding mold for plastic kettles with bottom threaded tea strainer structure

Abstract

This utility model belongs to the field of mold technology, and particularly relates to a blow molding mold for a plastic kettle with a bottom threaded tea strainer structure. This utility model includes a left half mold and a right half mold. The left half mold has, from top to bottom, a left blow opening, a left molding cavity, and a left bottom threaded molding structure. The right half mold has, from top to bottom, a right blow opening, a right molding cavity, and a right bottom threaded molding structure. When the mold is closed, the left and right blow openings are aligned, the left and right molding cavities are aligned, and the left and right bottom threaded molding structures are aligned. During the blow molding process, this utility model, through the precise cooperation of the left and right bottom threaded molding structures, simultaneously completes the forming of the bottom threaded tea strainer structure, completely eliminating secondary processing and greatly improving production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a blow molding mold for a plastic kettle with a bottom threaded tea strainer structure. Background Technology

[0002] In the plastic kettle manufacturing industry, traditional blow molding molds struggle to create kettles with a threaded tea strainer at the bottom in a single process. Existing technologies typically employ a step-by-step processing method: first, the kettle body is blow-molded, and then the threaded tea strainer is added through secondary injection molding, machining, or assembly. This process has significant drawbacks: firstly, secondary processing increases production steps and extends the manufacturing cycle, leading to higher labor and equipment costs; secondly, step-by-step processing is prone to dimensional deviations, affecting the precision of the thread fit and sealing performance, resulting in problems such as product leakage and tea strainer detachment, severely hindering product quality and production efficiency. Therefore, there is an urgent need to design a blow molding mold for plastic kettles that can simultaneously mold the threaded tea strainer at the bottom while ensuring a tight seal.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses a blow molding die [application number: 200980151419.4]. The device has at least one blow molding die for receiving the plastic preform, wherein the blow molding die has two mold parts that are pivotable relative to each other about a connecting shaft. The device has at least one locking element disposed on one of the mold parts and cooperating with at least one counting element disposed on the other mold part to lock the two mold parts relative to each other. The counting element is a counting element disposed substantially parallel to the shaft disposed on the connecting shaft. The counting element is rotatable between a locked position and an unlocked position. In the locked position, the blow molding die is locked, and in the unlocked position, the blow molding die can be opened. The counting element is designed such that the counting element at least partially rests on the locking element in the locked position and releases the locking element in the unlocked position. The device also has an actuating element for rotating the counting element, the actuating element including a driving element that cooperates with the counting element to actuate the counting element. However, this solution is not suitable for molded plastic kettles, and it is difficult to simultaneously mold the threaded tea strainer structure at the bottom of the plastic kettle, resulting in a difficulty in ensuring a tight seal. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a blow molding mold for a plastic kettle with a bottom threaded tea strainer structure.

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

[0006] A blow molding mold for a plastic kettle with a bottom threaded tea strainer structure includes a left half mold and a right half mold. The left half mold has a left blow opening, a left molding cavity, and a left bottom threaded molding structure arranged from top to bottom. The right half mold has a right blow opening, a right molding cavity, and a right bottom threaded molding structure arranged from top to bottom. When the mold is closed, the left blow opening and the right blow opening are directly opposite each other, the left molding cavity and the right molding cavity are directly opposite each other, and the left bottom threaded molding structure and the right bottom threaded molding structure are directly opposite each other. A bottom sealing insert is provided between the left half mold and the right half mold, and the bottom sealing insert is located below the left bottom threaded molding structure and the right bottom threaded molding structure.

[0007] In the above-mentioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the left bottom threaded molding structure includes a left bottom molding half cavity for the tea strainer set in the left half mold, and a left threaded molding groove is provided in the bottom seat side molding half cavity of the tea strainer.

[0008] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the bottom left half-cavity of the tea strainer is further provided with a threaded head forming groove and a threaded tail forming groove.

[0009] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the left-side thread forming groove is located between the thread head forming groove and the thread tail forming groove.

[0010] In the above-mentioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the right bottom threaded molding structure includes a right bottom molding half cavity for the tea strainer located in the right half mold, and the right bottom molding half cavity for the tea strainer has a right threaded molding groove.

[0011] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, when the left and right halves of the mold are fitted together, the left thread forming groove, the thread head forming groove, and the thread tail forming groove are respectively connected to the right thread forming groove.

[0012] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the bottom sealing insert includes a sealing plug seat disposed between the left half mold and the right half mold, wherein the inner walls of the left half mold and the right half mold respectively abut against the outer edge of the sealing plug seat.

[0013] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the sealing plug seat includes a plug head, a sealing ring, and a plug bottom shaft, wherein the cross-sectional area of ​​the sealing ring is larger than the cross-sectional area of ​​the plug head.

[0014] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the left and right halves of the mold have sealing ring grooves, and the sealing rings abut against the sealing ring grooves.

[0015] In the aforementioned blow molding mold for a plastic kettle with a bottom threaded tea strainer structure, the left and right halves of the mold also have supporting protrusions, the tops of which abut against a sealing ring.

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

[0017] 1. In the blow molding process, this utility model achieves simultaneous molding of the bottom threaded tea strainer structure by precisely matching the left and right bottom threaded molding structures, completely eliminating secondary processing and greatly improving production efficiency.

[0018] 2. The bottom sealing insert in this utility model adopts a multi-layer sealing structure design, which combines the synergistic effect of the sealing ring groove and the supporting protrusion to ensure the bottom sealing performance of the product.

[0019] 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

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a partial structural schematic diagram of the present invention.

[0022] Figure 3 This is a structural diagram of the left half of the mold.

[0023] Figure 4 This is a structural diagram of the right half of the mold.

[0024] Figure 5 This is a schematic diagram of the bottom sealing insert.

[0025] In the diagram: 1. Left half mold; 2. Right half mold; 3. Left blow molding port; 4. Left molding cavity; 5. Left bottom threaded molding structure; 6. Right blow molding port; 7. Right bottom threaded molding structure; 8. Bottom sealing insert; 9. Tea strainer bottom seat side molding half cavity; 10. Left threaded molding groove; 11. Thread head molding groove; 12. Thread tail molding groove; 13. Tea strainer bottom right molding half cavity; 14. Right threaded molding groove; 15. Sealing plug seat; 16. Plug head; 17. Sealing ring; 18. Plug bottom shaft; 19. Sealing ring groove; 20. Supporting protrusion; 21. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-5As shown, a blow molding mold for a plastic kettle with a bottom threaded tea strainer structure includes a left half mold 1 and a right half mold 2. The left half mold 1 has a left blow opening 3, a left molding cavity 4, and a left bottom threaded molding structure 5 arranged from top to bottom. The right half mold 2 has a right blow opening 6, a right molding cavity 7, and a right bottom threaded molding structure 8 arranged from top to bottom. When the mold is closed, the left blow opening 3 and the right blow opening 6 are directly opposite each other, the left molding cavity 4 and the right molding cavity 7 are directly opposite each other, and the left bottom threaded molding structure 5 and the right bottom threaded molding structure 8 are directly opposite each other. A bottom sealing insert 9 is provided between the left half mold 1 and the right half mold 2. The bottom sealing insert 9 is located below the left bottom threaded molding structure 5 and the right bottom threaded molding structure 8.

[0028] In this embodiment, when the mold is closed, the left blow-molding port 3 and the right blow-molding port 6 are aligned axially to form a complete material inlet channel; the left molding cavity 4 and the right molding cavity 7 are spliced ​​together to form the main body molding space of the kettle; the left bottom threaded molding structure 5 and the right bottom threaded molding structure 8 are completely fitted together to form the molding cavity of the bottom threaded tea strainer; the bottom sealing insert 9 is embedded in the gap between the two half molds to achieve sealing. The modular and layered design allows each functional area of ​​the mold to be molded independently and precisely matched. The blow-molding port ensures efficient material inlet, the molding cavity ensures the molding of the main body of the kettle, and the bottom threaded molding structure and the sealing insert work together to achieve synchronous thread molding and bottom sealing. This changes the traditional step-by-step processing mode, eliminates the need for secondary processing, reduces processes, and improves production efficiency.

[0029] Combination Figure 1-5 As shown, the left bottom threaded forming structure 5 includes a left bottom forming half cavity 10 of the tea strainer set in the left half mold 1, and a left threaded forming groove 11 is provided in the bottom seat side forming half cavity 10 of the tea strainer. The right bottom threaded forming structure 8 includes a right bottom forming half cavity 14 of the tea strainer set in the right half mold 2, and a right threaded forming groove 15 is provided in the bottom right forming half cavity 14 of the tea strainer.

[0030] In this embodiment, the left half-cavity 10 at the bottom of the tea strainer and the right half-cavity 14 at the bottom of the tea strainer are joined together to form a complete bottom molding space for the tea strainer. The left thread forming groove 11 and the right thread forming groove 15 cooperate to form an annular thread groove. The thread is formed directly during the blow molding process through the groove structure, avoiding the precision loss caused by traditional cutting or secondary injection molding. The precise design of the left thread forming groove 11 ensures the consistency of the thread profile and pitch.

[0031] The bottom left half cavity 10 of the tea strainer is also provided with a thread head forming groove 12 and a thread tail forming groove 13. The left thread forming groove 11 is located between the thread head forming groove 12 and the thread tail forming groove 13. When the left half mold 1 and the right half mold 2 are fitted together, the left thread forming groove 11, the thread head forming groove 12 and the thread tail forming groove 13 are respectively connected to the right thread forming groove 15.

[0032] In this embodiment, a thread head forming groove 12 and a thread tail forming groove 13 are added to the left half cavity 10 at the bottom of the tea strainer. The three are arranged in sequence along the thread direction. After the left and right half molds are closed, the thread head forming groove 12, the thread forming groove 11, and the thread tail forming groove 13 on the left side are respectively connected to the thread forming groove 15 on the right side to form a complete thread forming channel. This solves the technical bottleneck that traditional molds have difficulty forming the connection between the beginning and end of the thread. The thread head / tail forming grooves are designed with a special transition structure to ensure a smooth transition between the beginning and end of the thread, avoiding defects such as broken teeth and burrs, and improving the strength of the thread connection.

[0033] The bottom sealing insert 9 includes a sealing plug seat 16 disposed between the left half mold 1 and the right half mold 2, wherein the inner walls of the left half mold 1 and the right half mold 2 respectively abut against the outer edge of the sealing plug seat 16.

[0034] In this embodiment, the sealing plug seat 16 fills the gap at the bottom of the mold through an interference fit to prevent leakage of plastic raw materials, while providing stable support for the bottom thread forming.

[0035] Combination Figure 2-5 As shown, the sealing plug seat 16 includes a plug head 17, a sealing ring 18, and a plug bottom shaft 19, wherein the cross-sectional area of ​​the sealing ring 18 is larger than the cross-sectional area of ​​the plug head 17.

[0036] In this embodiment, the plug 17 is inserted into the center hole at the bottom of the mold, and the sealing ring 18 expands to fit tightly against the inner wall of the mold. The plug bottom shaft 19 provides axial support. The expansion characteristics of the sealing ring 18 enable it to form a dynamic seal under the mold closing pressure. Compared with the traditional static sealing structure, the sealing effect is improved. The larger cross-sectional area design increases the sealing contact area, ensuring no leakage under high pressure blow molding environment.

[0037] Combination Figure 3-5 As shown, the left half mold 1 and the right half mold 2 have sealing ring grooves 20, and the sealing ring 18 abuts against the sealing ring grooves 20.

[0038] In this embodiment, the sealing ring 18 is embedded in the groove 20 to form a "convex-concave" mating structure. The groove 20 provides precise positioning for the sealing ring 18 and prevents it from shifting under blow molding pressure. This structural design improves the sealing stability of the sealing ring and facilitates the installation and removal of the insert.

[0039] Combination Figure 3-5 As shown, the left half mold 1 and the right half mold 2 also have supporting protrusions 21, the top of which abuts against the sealing ring 18.

[0040] In this embodiment, the supporting protrusions 21 are distributed in a ring shape, evenly supporting the sealing ring 18 and sharing the blow molding pressure. The supporting protrusions 21 effectively prevent the sealing ring 18 from deforming due to pressure, ensuring that it always maintains a good sealing state and reducing the maintenance frequency.

[0041] The working principle of this utility model is as follows:

[0042] During the mold closing stage, the left half mold 1 and the right half mold 2 are precisely aligned through the guide mechanism. The sealing plug seat 16 is embedded in the bottom of the two half molds, and the sealing ring 18 is embedded in the sealing ring groove 20 under the support of the supporting protrusion 21, forming a three-level sealing structure. During blow molding, high-temperature and high-pressure plastic raw materials are injected into the molding cavities 4 and 7 through the blow molding ports 3 and 6, and at the same time, they fill the threaded channel formed by the bottom threaded molding structure on both sides. The left thread head molding groove 12, the left thread molding groove 11, the thread tail molding groove 13 and the right thread molding groove 15 work together to fill the raw materials along the spiral trajectory, forming the bottom threaded tea strainer structure in one go. Throughout the process, the bottom sealing insert 9 bears the blow molding pressure to prevent raw material leakage and ensure the bottom sealing and thread accuracy of the product. After cooling and demolding, a high-quality plastic water bottle with one-piece molding can be obtained, completely avoiding secondary processing.

[0043] 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.

[0044] Although this document frequently uses terms such as left half mold 1, right half mold 2, left blow molding port 3, left molding cavity 4, left bottom threaded molding structure 5, right blow molding port 6, right molding cavity 7, right bottom threaded molding structure 8, bottom sealing insert 9, tea strainer bottom seat side molding half cavity 10, left threaded molding groove 11, thread head molding groove 12, thread tail molding groove 13, tea strainer bottom right molding half cavity 14, right threaded molding groove 15, sealing plug seat 16, plug head 17, sealing ring 18, plug bottom shaft 19, sealing ring groove 20, supporting protrusion 21, 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 plastic water jug blow mould having a bottom threaded tea strainer structure comprising a left half mould (1) and a right half mould (2), characterised in that, The left half mold (1) has a left blow molding port (3), a left molding cavity (4) and a left bottom threaded molding structure (5) in sequence from top to bottom. The right half mold (2) has a right blow molding port (6), a right molding cavity (7) and a right bottom threaded molding structure (8) in sequence from top to bottom. When the mold is closed, the left blow molding port (3) and the right blow molding port (6) are directly opposite each other, the left molding cavity (4) and the right molding cavity (7) are directly opposite each other, and the left bottom threaded molding structure (5) and the right bottom threaded molding structure (8) are directly opposite each other. A bottom sealing insert (9) is provided between the left half mold (1) and the right half mold (2). The bottom sealing insert (9) is located below the left bottom threaded molding structure (5) and the right bottom threaded molding structure (8).

2. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 1, characterized in that, The left bottom threaded forming structure (5) includes a tea strainer bottom left side forming half cavity (10) set in the left half mold (1), and a left side threaded forming groove (11) is provided in the tea strainer bottom seat side forming half cavity (10).

3. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 2, characterized in that, The bottom left side of the tea strainer is also provided with a thread head forming groove (12) and a thread tail forming groove (13).

4. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 3, characterized in that, The left thread forming groove (11) is located between the thread head forming groove (12) and the thread tail forming groove (13).

5. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 4, characterized in that, The right bottom threaded molding structure (8) includes a right bottom molding half cavity (14) of the tea strainer disposed in the right half mold (2), and the right bottom molding half cavity (14) of the tea strainer has a right threaded molding groove (15).

6. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 5, characterized in that, When the left half mold (1) and the right half mold (2) are fitted together, the left thread forming groove (11), the thread head forming groove (12) and the thread tail forming groove (13) are connected to the right thread forming groove (15) respectively.

7. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 1, characterized in that, The bottom sealing insert (9) includes a sealing plug seat (16) disposed between the left half mold (1) and the right half mold (2), wherein the inner walls of the left half mold (1) and the right half mold (2) respectively abut against the outer edge of the sealing plug seat (16).

8. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 7, characterized in that, The sealing plug seat (16) includes a plug head (17), a sealing ring (18), and a plug bottom shaft (19), wherein the cross-sectional area of ​​the sealing ring (18) is larger than the cross-sectional area of ​​the plug head (17).

9. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 8, characterized in that, The left half mold (1) and the right half mold (2) have sealing ring grooves (20), and the sealing ring (18) abuts against the sealing ring grooves (20).

10. The blow molding mold for a plastic kettle with a bottom threaded tea strainer structure according to claim 8, characterized in that, The left half mold (1) and the right half mold (2) also have supporting protrusions (21), the top of which abuts against the sealing ring (18).

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