Balanced cooling mechanism for mold core of PET bottle preform injection molding mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a balanced cooling mechanism for a mold core of a PET (Polyethylene Terephthalate) bottle preform injection molding mold. The PET bottle preform injection molding die comprises a PET bottle preform injection molding lower die, a PET bottle preform injection molding middle die and a PET bottle preform injection molding upper die. In the injection molding process, the ET bottle preform injection molding lower mold, the PET bottle preform injection molding middle mold and the PET bottle preform injection molding upper mold are attached to one another, so that the multi-cavity bottle preform molding lower part, the multi-cavity bottle preform molding middle part and the multi-cavity bottle preform molding upper part are communicated to form a complete bottle preform cavity; after injection molding is completed, cooling liquid is injected into the multi-runner balanced cooling assembly, the multiple formed bottle blank plastic parts are synchronously cooled through the multi-runner balanced cooling assembly, the mode of cooling from the middle to the upper end and the lower end is adopted, and the cooling speed of the plastic parts is ensured; the upper and lower cooling time is consistent, and the overall quality of the plastic part is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a mold core balanced cooling mechanism for a PET bottle embryo injection molding mold. Background Art

[0002] The surface of PET plastic bottles is smooth and shiny. It has good creep resistance, fatigue resistance, friction resistance and dimensional stability, low wear and high hardness, and has the greatest toughness among thermoplastics. When producing PET plastic bottles, a mold is usually used to injection mold the PET plastic bottle embryo and then process it. When the existing PET plastic bottle embryo injection mold is used to inject a long-length bottle embryo plastic part, its cooling structure is often set at the bottom of the plastic part. During cooling, it is difficult to ensure that the cooling time at the upper and lower ends of the plastic part is consistent, which will cause the outer diameter of the bottle embryo to be different, affecting the overall quality of the plastic part. Therefore, it is urgent to design a PET bottle embryo injection molding mold core balanced cooling mechanism that can overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a PET plastic bottle embryo injection mold [application number: 202211075068.7], which includes a base, a mounting frame is fixedly connected to the top of the base, an inner mold body is fixedly connected to one side of the mounting frame, a movable plate is sleeved on the outer wall of the inner mold body, the movable plate is in contact with the mounting frame, and the side of the movable plate away from the mounting frame is in contact with the outer mold body. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a balanced cooling mechanism for the core of a PET preform injection molding mold.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A balanced cooling mechanism for a mold core of a PET preform injection molding mold comprises a PET preform injection molding lower mold, a PET preform injection molding middle mold and a PET preform injection molding upper mold, wherein an injection molded part is arranged above the PET preform injection molding upper mold, a multi-cavity preform molding lower part is arranged in the PET preform injection molding lower mold, a multi-cavity preform molding middle part is arranged in the PET preform injection molding middle mold, a multi-cavity preform molding upper part is arranged in the PET preform injection molding upper mold, the bottom of the multi-cavity preform molding middle part is connected with the multi-cavity preform molding lower part, the top of the multi-cavity preform molding middle part is connected with the multi-cavity preform molding upper part, a multi-channel balanced cooling component is arranged in the PET preform injection molding middle mold, and the multi-channel balanced cooling component corresponds to the position of the multi-cavity preform molding middle part.

[0007] In the above-mentioned balanced cooling mechanism for the core of the PET preform injection molding mold, the multi-channel balanced cooling assembly includes two main cooling channels arranged in the PET preform injection molding mold, and cooling side channels extending to the middle part of the multi-chamber preform molding are arranged on both sides of the main cooling channels, and the cooling side channels are connected to the in-mold auxiliary cooling part on the side away from the main cooling channels.

[0008] In the above-mentioned balanced cooling mechanism for the core of the PET preform injection molding mold, the in-mold auxiliary cooling member includes an in-mold cooling channel arranged on the side of the cooling side channel away from the main cooling channel, and the in-mold cooling channel is staggered with the main cooling channel.

[0009] In the above-mentioned balanced cooling mechanism for the core of the PET preform injection molding mold, a cooling inlet is provided in the PET preform injection molding mold, and the cooling inlet is connected to the main cooling channel.

[0010] In the above-mentioned PET preform injection molding mold core balanced cooling mechanism, the cooling inlet portion includes a cooling inlet cavity arranged in the PET preform injection molding mold, and the cooling inlet cavity is connected to two main cooling channels.

[0011] In the above-mentioned balanced cooling mechanism for the core of the PET preform injection molding mold, the cooling inlet cavity is provided with two inlet through holes on both sides away from the main cooling channel, and the inlet through holes penetrate through the side of the PET preform injection molding middle mold.

[0012] In the above-mentioned PET preform injection molding mold core balanced cooling mechanism, the multi-chamber preform molding lower part includes a plurality of preform molding lower cavities arranged in the PET preform injection molding lower mold, the preform molding lower cavity is located directly below the middle of the multi-chamber preform molding, and the bottom of the preform molding lower cavity is connected to an ejection hole groove.

[0013] In the above-mentioned PET preform injection molding mold core balanced cooling mechanism, the multi-cavity preform molding middle part includes a plurality of preform molding middle cavities arranged in the PET preform injection molding middle mold.

[0014] In the above-mentioned PET preform injection molding mold core balanced cooling mechanism, the multi-cavity preform molding upper part includes a plurality of preform molding upper cavities arranged in the PET preform injection molding upper mold.

[0015] In the above-mentioned PET preform injection molding mold core balanced cooling mechanism, the injection molded part includes an injection molding main board and an injection molding diverter plate arranged above the PET preform injection molding upper mold.

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

[0017] 1. In the injection molding process of the utility model, the ET preform injection molding lower mold, the PET preform injection molding middle mold and the PET preform injection molding upper mold are attached to each other, so that the multi-chamber preform molding lower part, the multi-chamber preform molding middle part and the multi-chamber preform molding upper part are connected to form a complete preform cavity, and the molten material is injected into the cavity through the injection molding part for injection molding. After the injection molding is completed, the coolant is injected into the multi-channel balanced cooling component, and the molded multiple preform plastic parts are synchronously cooled by the multi-channel balanced cooling component. The cooling is carried out from the middle to the upper and lower ends to ensure the cooling rate of the plastic parts, and the upper and lower cooling times are relatively consistent, thereby improving the overall quality of the plastic parts.

[0018] 2. The in-mold cooling channel in the utility model is used to assist in cooling the temperature of the mold to avoid overheating of the mold.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a partial structural schematic diagram of the utility model.

[0022] Figure 3 It is a partial structural schematic diagram of the utility model in another direction.

[0023] Figure 4 It is a schematic diagram of the structure of the lower mold for PET bottle preform injection molding.

[0024] In the figure: PET preform injection molding lower mold 1, PET preform injection molding middle mold 2, PET preform injection molding upper mold 3, injection molded parts 4, multi-chamber preform molding lower part 5, multi-chamber preform molding middle part 6, multi-chamber preform molding upper part 7, multi-channel balanced cooling component 8, main cooling channel 9, cooling side channel 10, in-mold auxiliary cooling part 11, in-mold cooling channel 12, cooling inlet part 13, cooling inlet cavity 14, inlet through hole 15, preform molding lower cavity 16, ejection hole groove 17, preform molding middle cavity 18, preform molding upper cavity 19, injection molding main board 20, injection molding diverter plate 21. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] like Figure 1-4As shown, a balanced cooling mechanism for a core of a PET preform injection molding mold comprises a PET preform injection molding lower mold 1, a PET preform injection molding middle mold 2 and a PET preform injection molding upper mold 3, wherein an injection molded part 4 is arranged above the PET preform injection molding upper mold 3, a multi-cavity preform molding lower part 5 is arranged in the PET preform injection molding lower mold 1, a multi-cavity preform molding middle part 6 is arranged in the PET preform injection molding middle mold 2, a multi-cavity preform molding upper part 7 is arranged in the PET preform injection molding upper mold 3, a bottom of the multi-cavity preform molding middle part 6 is connected to the multi-cavity preform molding lower part 5, a top of the multi-cavity preform molding middle part 6 is connected to the multi-cavity preform molding upper part 7, a multi-channel balanced cooling component 8 is arranged in the PET preform injection molding middle mold 2, and the multi-channel balanced cooling component 8 corresponds to the position of the multi-cavity preform molding middle part 6.

[0027] In this embodiment, during the injection molding process, the ET preform injection molding lower mold 1, the PET preform injection molding middle mold 2 and the PET preform injection molding upper mold 3 are fitted together, so that the multi-chamber preform molding lower part 5, the multi-chamber preform molding middle part 6 and the multi-chamber preform molding upper part 7 are connected to form a complete preform cavity, and the molten material is injected into the cavity through the injection molding part 4 for injection molding. After the injection molding is completed, the coolant is injected into the multi-channel balanced cooling component 8, and the multi-channel balanced cooling component 8 is used to synchronously cool the multiple molded preform plastic parts. The cooling is carried out from the middle to the upper and lower ends to ensure the cooling rate of the plastic parts and the upper and lower cooling time are relatively consistent, thereby improving the overall quality of the plastic parts.

[0028] Combination Figure 1-4 As shown, the multi-channel balanced cooling component 8 includes two main cooling channels 9 arranged in the PET bottle preform injection molding middle mold 2, and cooling side channels 10 extending to the middle part 6 of the multi-chamber bottle preform molding are arranged on both sides of the main cooling channel 9. The cooling side channel 10 is connected to an in-mold auxiliary cooling component 11 on the side away from the main cooling channel 9.

[0029] Specifically, after the injection molding is completed, the coolant cools the multiple molded bottle preform plastic parts synchronously through the two main cooling channels 9 and the cooling side channel 10 extending to the middle part 6 of the multi-cavity bottle preform molding. The cooling is carried out from the middle to the upper and lower ends to ensure the cooling rate of the plastic parts. The cooling time is relatively consistent, thereby improving the overall quality of the plastic parts. The in-mold auxiliary cooling part 11 is used to assist in cooling the temperature of the mold to avoid overheating of the mold.

[0030] The in-mold auxiliary cooling member 11 includes an in-mold cooling channel 12 arranged on a side of the cooling side channel 10 away from the main cooling channel 9 , and the in-mold cooling channel 12 is staggered with the main cooling channel 9 .

[0031] In this embodiment, the in-mold cooling channel 12 is used to assist in cooling the temperature of the mold to prevent the mold from overheating.

[0032] Combination Figure 3 As shown, a cooling inlet 13 is provided in the PET preform injection molding middle mold 2 , and the cooling inlet 13 is connected to the main cooling channel 9 .

[0033] In this embodiment, the cooling inlet portion 13 can deliver the coolant into the two main cooling channels 9 simultaneously.

[0034] The cooling inlet portion 13 includes a cooling inlet cavity 14 disposed in the PET preform injection molding middle mold 2 , and the cooling inlet cavity 14 is connected to the two main cooling channels 9 .

[0035] In this embodiment, the cooling inlet cavity 14 can deliver the coolant into the two main cooling channels 9 simultaneously.

[0036] Combination Figure 3 As shown, the cooling inlet cavity 14 is provided with two inlet through holes 15 on both sides away from the main cooling channel 9 , and the inlet through holes 15 penetrate through the side of the PET preform injection molding middle mold 2 .

[0037] In this embodiment, the coolant enters the cooling inlet cavity 14 through the inlet through hole 15 .

[0038] The multi-chamber preform molding lower part 5 includes a plurality of preform molding lower cavities 16 arranged in the PET preform injection molding lower mold 1, the preform molding lower cavities 16 are located directly below the multi-chamber preform molding middle part 6, and the bottom of the preform molding lower cavities 16 is connected to an ejection hole groove 17.

[0039] In this embodiment, the preform molding lower cavity 16 is used to assist in molding the lower structure of the preform plastic part, and the ejection hole groove 17 can cooperate with the ejection rod to eject the molded plastic part.

[0040] Combination Figure 1-4 As shown, the multi-cavity preform molding middle part 6 includes a plurality of preform molding middle cavities 18 arranged in the PET preform injection molding middle mold 2.

[0041] In this embodiment, the preform molding middle cavity 18 is used to assist in molding the middle structure of the preform plastic part.

[0042] Combination Figure 1-4 As shown, the multi-chamber preform molding upper part 7 includes a plurality of preform molding upper cavities 19 arranged in the PET preform injection molding upper mold 3.

[0043] In this embodiment, the preform molding upper cavity 19 is used to assist in molding the upper structure of the preform plastic part.

[0044] Combination Figure 1 As shown, the injection molded part 4 includes an injection molded main board 20 and an injection molded diverter plate 21 which are arranged above the PET bottle embryo injection molding upper mold 3.

[0045] In this embodiment, during injection molding, the molten material is injection-divided through the injection molding main board 20 and the injection molding diverter plate 21, and the molten material is sent into multiple cavities to form multiple bottle preform plastic parts at one time.

[0046] The working principle of the utility model is:

[0047] During the injection molding process, the ET preform injection molding lower mold 1, the PET preform injection molding middle mold 2 and the PET preform injection molding upper mold 3 are attached to each other, so that multiple preform molding lower cavities 16, preform molding middle cavities 18 and preform molding upper cavities 19 are connected to form a complete preform molding cavity. The molten material is injection-molded and diverted through the injection molding main board 20 and the injection molding diverter plate 21, and the molten material is sent to multiple cavities to form multiple preform plastic parts at one time. After the injection molding is completed, the coolant passes through the two main cooling channels 9 and the cooling side channel 10 extending to the preform molding middle cavity 18 to synchronously cool the multiple preform plastic parts. The cooling is carried out from the middle to the upper and lower ends to ensure the cooling rate of the plastic parts and the upper and lower cooling time are relatively consistent, thereby improving the overall quality of the plastic parts. The in-mold cooling channel 12 is used to assist in cooling the temperature of the mold to avoid overheating of the mold.

[0048] The cooling inlet cavity 14 can simultaneously deliver the coolant into the two main cooling channels 9. The coolant enters the cooling inlet cavity 14 through the inlet through hole 15.

[0049] The preform molding lower cavity 16 is used to assist in molding the lower structure of the preform plastic part, the ejection hole groove 17 can cooperate with the ejection rod to eject the molded plastic part, the preform molding middle cavity 18 is used to assist in molding the middle structure of the preform plastic part, and the preform molding upper cavity 19 is used to assist in molding the upper structure of the preform plastic part.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0051] Although the following terms are used more frequently in this article, such as PET preform injection molding lower mold 1, PET preform injection molding middle mold 2, PET preform injection molding upper mold 3, injection molded part 4, multi-chamber preform molding lower part 5, multi-chamber preform molding middle part 6, multi-chamber preform molding upper part 7, multi-channel balanced cooling component 8, main cooling channel 9, cooling side channel 10, in-mold auxiliary cooling part 11, in-mold cooling channel 12, cooling inlet part 13, cooling inlet cavity 14, inlet through hole 15, preform molding lower cavity 16, ejection hole groove 17, preform molding middle cavity 18, preform molding upper cavity 19, injection molding main board 20, injection molding manifold 21, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model, and interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A PET preform injection molding mold core balanced cooling mechanism, comprising a PET preform injection molding lower mold (1), a PET preform injection molding middle mold (2) and a PET preform injection molding upper mold (3), characterized in that: An injection molded part (4) is arranged above the PET preform injection molding upper mold (3); a multi-chamber preform molding lower part (5) is arranged inside the PET preform injection molding lower mold (1); a multi-chamber preform molding middle part (6) is arranged inside the PET preform injection molding middle mold (2); a multi-chamber preform molding upper part (7) is arranged inside the PET preform injection molding upper mold (3); the bottom of the multi-chamber preform molding middle part (6) is connected to the multi-chamber preform molding lower part (5); the top of the multi-chamber preform molding middle part (6) is connected to the multi-chamber preform molding upper part (7); a multi-channel balanced cooling component (8) is arranged inside the PET preform injection molding middle mold (2); the multi-channel balanced cooling component (8) corresponds to the position of the multi-chamber preform molding middle part (6).

2. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 1, characterized in that: The multi-channel balanced cooling assembly (8) comprises two main cooling channels (9) arranged in a PET preform injection molding middle mold (2), cooling side channels (10) extending to the middle part (6) of the multi-chamber preform molding are arranged on both sides of the main cooling channels (9), and the cooling side channels (10) are connected to an in-mold auxiliary cooling component (11) on the side away from the main cooling channels (9).

3. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 2, characterized in that: The in-mold auxiliary cooling member (11) comprises an in-mold cooling channel (12) arranged on a side of the cooling side channel (10) away from the main cooling channel (9), and the in-mold cooling channel (12) and the main cooling channel (9) are arranged in an alternating manner.

4. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 3, characterized in that: The PET preform injection molding middle mold (2) is provided with a cooling inlet portion (13), and the cooling inlet portion (13) is connected to the main cooling channel (9).

5. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 4, characterized in that: The cooling inlet portion (13) comprises a cooling inlet cavity (14) arranged in a PET preform injection molding middle mold (2), and the cooling inlet cavity (14) is connected to two main cooling channels (9).

6. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 5, characterized in that: The cooling inlet cavity (14) is provided with two inlet through holes (15) on both sides away from the main cooling channel (9), and the inlet through holes (15) penetrate through the side of the PET preform injection molding middle mold (2).

7. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 6, characterized in that: The multi-chamber preform molding lower part (5) comprises a plurality of preform molding lower cavities (16) arranged in a PET preform injection molding lower mold (1), the preform molding lower cavities (16) being located directly below the multi-chamber preform molding middle part (6), and the bottom of the preform molding lower cavities (16) is connected to an ejection hole groove (17).

8. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 7, characterized in that: The multi-cavity preform molding middle part (6) comprises a plurality of preform molding middle cavities (18) arranged in a PET preform injection molding middle mold (2).

9. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 8, characterized in that: The multi-chamber preform molding upper part (7) comprises a plurality of preform molding upper cavities (19) arranged in a PET preform injection molding upper mold (3).

10. The balanced cooling mechanism for the core of the PET preform injection molding mold according to claim 9, characterized in that: The injection molded part (4) comprises an injection molded main board (20) and an injection molded diverter plate (21) which are arranged above the PET bottle embryo injection molding upper mold (3).

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