PET bottle blank injection mold with spiral cooling mechanism

Abstract

The utility model belongs to the technical field of molds, and relates to a PET (Polyethylene Terephthalate) bottle blank injection mold with a spiral cooling mechanism. The four-hole split-flow injection mold comprises an upper mold plate and a lower mold plate, and a four-hole split-flow injection molding part is arranged above the upper mold plate. In the injection molding process, the spiral cooling molding upper cylinder assembly and the bottle blank molding inner cylinder piece are close to each other and are matched with the middle molding sleeve piece to form a complete cavity, molten materials are subjected to one-out-four injection molding flow division through the four-hole flow division injection molding piece, the materials are synchronously fed into the four cavities, and four bottle blank plastic pieces can be molded at a time; after injection molding is completed, cooling water is introduced into the water inlet and outlet part, the water inlet and outlet part is matched with the spiral cooling forming upper cylinder assembly to cool the top of a formed plastic part, a spiral heat dissipation cooling structure is adopted, a good heat dissipation space and a heat dissipation structure are achieved, cooling is uniform, an indirect contact cooling mode is adopted, water inlet and outlet are faster, and the cooling effect is better. And the cooling effect is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a PET bottle preform injection mold with a spiral cooling mechanism. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of colors and patterns, shapes that can be from simple to complex, and sizes that can be from large to small. In addition, the product size is precise, the product is easy to update, and it can be made into parts with complex shapes. Injection molding is suitable for mass production and molding processing fields such as products with complex shapes. When manufacturing existing PET bottle blanks, the basic method is to first inject and then blow mold them. During the injection molding process, the existing PET bottle blank injection mold generally adopts a straight-through pipeline for water cooling. During the cooling process, this type of cooling method lacks a good heat dissipation space between the cooling water and the plastic part, making it difficult to cool the plastic part evenly, and the cooling effect is relatively general. Therefore, it is urgently needed to design a PET bottle blank injection mold with a spiral cooling mechanism that can overcome the above defects.

[0003] In order to overcome the shortcomings of the existing technology, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a PET bottle preform mold [application number: 202110134445.9], including a fixed mold base, a cavity fixing plate, a cavity insert, a cavity, a gate sleeve, a straight runner, a mounting hole, a guide sleeve, a guide column, a core fixing plate, a core insert, a cross runner, an inner runner, a rib molding cavity, a thread molding cavity, a first-level ejection mechanism, a second-level ejection mechanism, a third-level ejection mechanism provided at the second-level ejection mechanism, a support block provided at the lower part of the core fixing plate and a movable template fixedly connected to the support block; it is characterized in that: the thread molding cavity includes a threaded sleeve fixedly connected to the threaded sleeve rotatably connected to the thread molding cavity, and a thread mold fixedly connected to the inside of the threaded sleeve. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a PET bottle preform injection mold with a spiral cooling mechanism.

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

[0006] A PET bottle blank injection mold with a spiral cooling mechanism includes an upper template and a lower template, a four-hole diversion injection molding part is provided above the upper template, a spiral cooling molding upper cylinder assembly and a bottle blank molding inner cylinder component are provided between the upper template and the lower template, the spiral cooling molding upper cylinder assembly is connected to the upper template, the bottle blank molding inner cylinder component is connected to the lower template, a middle molding kit is provided between the spiral cooling molding upper cylinder assembly and the bottle blank molding inner cylinder component, and a water inlet and outlet are provided in the upper template, and the water inlet and outlet correspond to the position of the spiral cooling molding upper cylinder assembly.

[0007] In the above-mentioned PET bottle blank injection mold with a spiral cooling mechanism, the spiral cooling molding upper cylinder assembly includes a molding upper cylinder arranged in the upper template, an injection cylinder hole is provided in the molding upper cylinder, and the outer ring of the molding upper cylinder has a spiral outer ring, and the spiral outer ring corresponds to the position of the water inlet and outlet.

[0008] In the above-mentioned PET bottle blank injection mold with a spiral cooling mechanism, the water inlet and outlet part includes four water inlet and outlet cooling channels arranged in the upper template. The water inlet and outlet cooling channels pass through the upper template, and a heat dissipation space is formed between the spiral outer ring and the upper template.

[0009] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, the preform molding inner cylinder member includes a preform molding inner cylinder body provided on the lower template, and the top of the preform molding inner cylinder body extends into the molding upper cylinder.

[0010] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, a base plate is provided at the bottom of the lower template, a positioning bottom groove is provided in the base plate, and the bottom of the inner cylinder of the preform molding is snap-fitted with the positioning bottom groove.

[0011] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, the middle molding kit includes a middle sleeve arranged between the upper mold plate and the lower mold plate, the preform molding inner cylinder passes through the middle sleeve, and the bottom of the middle sleeve abuts against the lower mold plate.

[0012] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, a spliced ​​sealing member is provided between the middle sleeve and the molding upper cylinder.

[0013] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, the spliced ​​seal comprises two sealing frames arranged between the middle sleeve and the molding upper cylinder, and the two sealing frames are fitted together.

[0014] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, a fixed support plate is provided between the sealing frame and the lower template, the top of the fixed support plate abuts against the bottom of the sealing frame, and the bottom of the fixed support plate abuts against the lower template.

[0015] In the above-mentioned PET preform injection mold with a spiral cooling mechanism, the four-hole diversion injection molded part includes an injection diversion plate arranged above the upper template, and the bottom of the injection diversion plate is provided with four diversion holes connected to the injection cylinder holes.

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

[0017] 1. During the injection molding process, the present invention places the spiral cooling molding upper cylinder component and the bottle blank molding inner cylinder component close to each other, and cooperates with the middle molding kit to form a complete cavity. The molten material is diverted through the four-hole diversion injection molding component for one-out four injection, and the material is simultaneously fed into the four cavities. Four bottle blank plastic parts can be molded at one time. After the injection molding is completed, cooling water is introduced into the water inlet and outlet parts, and the top of the molded plastic part is cooled by the water inlet and outlet parts in cooperation with the spiral cooling molding upper cylinder component. The spiral heat dissipation cooling structure is adopted, which has good heat dissipation space and heat dissipation structure, uniform cooling, and adopts indirect contact cooling form, which makes the water inlet and outlet faster, further improving the cooling effect.

[0018] 2. The two sealing frames in the present invention fit together to fill and seal the gap between the middle sleeve and the forming upper cylinder to prevent material leakage.

[0019] Other advantages, objectives and features of the present invention will be reflected 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 diagram of the present utility model.

[0021] Figure 2 It is a cross-sectional schematic diagram of the present utility model.

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

[0023] Figure 4 It is a partial structural diagram of the utility model in another direction.

[0024] In the figure: upper template 1, lower template 2, four-hole diverter injection molding part 3, spiral cooling molding upper cylinder assembly 4, bottle blank molding inner cylinder part 5, middle molding kit 6, water inlet and outlet 7, molding upper cylinder 8, injection molding cylinder hole 9, spiral outer ring 10, inlet and outlet water cooling channel 11, heat dissipation space 12, bottle blank molding inner cylinder body 13, base plate 14, positioning bottom groove 15, middle sleeve 16, spliced ​​seal 17, sealing frame 18, fixed support plate 19, injection molding diverter plate 20, diverter hole 21. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, a PET bottle blank injection mold with a spiral cooling mechanism includes an upper template 1 and a lower template 2, a four-hole diversion injection molding part 3 is provided above the upper template 1, a spiral cooling molding upper cylinder assembly 4 and a bottle blank molding inner cylinder part 5 are provided between the upper template 1 and the lower template 2, the spiral cooling molding upper cylinder assembly 4 is connected to the upper template 1, and the bottle blank molding inner cylinder part 5 is connected to the lower template 2, a middle molding kit 6 is provided between the spiral cooling molding upper cylinder assembly 4 and the bottle blank molding inner cylinder part 5, and a water inlet and outlet part 7 is provided in the upper template 1, and the water inlet and outlet part 7 corresponds to the position of the spiral cooling molding upper cylinder assembly 4.

[0027] In this embodiment, during the injection molding process, the spiral cooling molding upper cylinder assembly 4 and the bottle blank molding inner cylinder 5 are brought close to each other, and the middle molding kit 6 is cooperated to form a complete cavity. The molten material is diverted through the four-hole diversion injection molding part 3 for one-out four injection molding, and the material is simultaneously fed into the four cavities. Four bottle blank plastic parts can be molded at one time. After the injection molding is completed, the cooling water is introduced into the water inlet and outlet part 7, and the top of the molded plastic part is cooled by the water inlet and outlet part 7 in cooperation with the spiral cooling molding upper cylinder assembly 4. The spiral heat dissipation cooling structure is adopted, which has good heat dissipation space and heat dissipation structure, uniform cooling, and adopts indirect contact cooling form, which makes the water inlet and outlet faster, further improving the cooling effect.

[0028] Combine Figure 1-4 As shown, the spiral cooling molding upper cylinder assembly 4 includes a molding upper cylinder 8 arranged in the upper template 1, an injection cylinder hole 9 is provided in the molding upper cylinder 8, and the outer ring of the molding upper cylinder 8 has a spiral outer ring 10, and the spiral outer ring 10 corresponds to the position of the water inlet and outlet 7.

[0029] Specifically, during the injection molding process, the molten material is injected into the mold cavity through the injection barrel hole 9. After the injection molding is completed, the cooling water is passed into the water inlet and outlet part 7. The water inlet and outlet part 7 cooperates with the spiral outer ring 10 to cool the top of the molded plastic part. The spiral heat dissipation cooling structure is adopted, which has good heat dissipation space and heat dissipation structure, uniform cooling, and adopts indirect contact cooling form, which makes the water inlet and outlet faster, further improving the cooling effect.

[0030] Combine Figure 1 、 Figure 2 As shown, the water inlet and outlet portion 7 includes four water inlet and outlet cooling channels 11 arranged in the upper template 1. The water inlet and outlet cooling channels 11 pass through the upper template 1, and a heat dissipation space 12 is formed between the spiral outer ring 10 and the upper template 1.

[0031] In this embodiment, after the injection molding is completed, the cooling water is passed into the inlet and outlet water cooling channel 11, and the top of the molded plastic part is cooled by the inlet and outlet water cooling channel 11 in conjunction with the spiral outer ring 10. A spiral heat dissipation cooling structure is adopted, and a heat dissipation space 12 is formed between the spiral outer ring 10 and the upper template 1. It has a good heat dissipation space and heat dissipation structure, and the cooling is uniform. In addition, the indirect contact cooling form is adopted, and the water in and out is faster, further improving the cooling effect.

[0032] The preform molding inner cylinder member 5 includes a preform molding inner cylinder body 13 provided on the lower template 2 , and the top of the preform molding inner cylinder body 13 extends into the molding upper cylinder 8 .

[0033] In this embodiment, the preform forming inner cylinder 13 is used to assist in forming the preform plastic part.

[0034] Combine Figure 2 As shown, a base plate 14 is provided at the bottom of the lower template 2 , a positioning bottom groove 15 is provided in the base plate 14 , and the bottom of the preform forming inner cylinder 13 is snap-fitted with the positioning bottom groove 15 .

[0035] In this embodiment, the bottom of the preform forming inner cylinder 13 is fixed by the positioning bottom groove 15 in the base plate 14, so as to prevent the preform forming inner cylinder 13 from shaking during injection molding, and the stability is strong.

[0036] The middle forming kit 6 includes a middle sleeve 16 disposed between the upper template 1 and the lower template 2 . The preform forming inner cylinder 13 passes through the middle sleeve 16 , and the bottom of the middle sleeve 16 abuts against the lower template 2 .

[0037] In this embodiment, the middle sleeve 16 is used to assist in forming the bottle preform.

[0038] A splicing seal 17 is provided between the middle sleeve 16 and the forming upper cylinder 8 .

[0039] In this embodiment, the spliced ​​seal 17 can fill and seal the gap between the middle sleeve 16 and the forming upper cylinder 8 to prevent material leakage.

[0040] Combine Figure 2 As shown, the spliced ​​seal 17 includes two sealing frames 18 arranged between the middle sleeve 16 and the molded upper cylinder 8, and the two sealing frames 18 are in contact with each other.

[0041] In this embodiment, the two sealing frames 18 fit together to fill and seal the gap between the middle sleeve 16 and the forming upper cylinder 8 to prevent material leakage.

[0042] Combine Figure 1 、 Figure 2As shown, a fixed support plate 19 is provided between the sealing frame 18 and the lower template 2 , the top of the fixed support plate 19 abuts against the bottom of the sealing frame 18 , and the bottom of the fixed support plate 19 abuts against the lower template 2 .

[0043] In this embodiment, the fixed support plate 19 supports and fixes the sealing frame 18 to prevent the sealing frame 18 from being suspended in the air, and at the same time seals the middle sleeve 16 and the bottle blank forming inner cylinder 13.

[0044] Combine Figure 2 As shown, the four-hole diversion injection molded part 3 includes an injection diversion plate 20 arranged above the upper template 1, and four diversion holes 21 connected to the injection cylinder holes 9 are provided at the bottom of the injection diversion plate 20.

[0045] In this embodiment, during injection molding, the molten material is diverted through the injection diverter plate 20 and the diverter hole 21 and can be injected into four mold cavities at the same time, forming a one-out-four injection molding with high injection efficiency.

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

[0047] During the injection molding process, the molding upper cylinder 8 and the bottle blank molding inner cylinder 13 are brought close to each other, and the middle sleeve 16 is used to form a complete cavity. The molten material is diverted through the injection molding diverter plate 20 and the diverter hole 21, and the molten material is injected into the cavity through the injection molding cylinder hole 9. It can be injected into four cavities at the same time to form a one-out-four injection molding, which has high injection molding efficiency. After the injection molding is completed, the cooling water is introduced into the inlet and outlet water cooling channel 11, and the top of the molded plastic part is cooled by the inlet and outlet water cooling channel 11 in conjunction with the spiral outer ring 10. The spiral heat dissipation cooling structure is adopted, and a heat dissipation space 12 is formed between the spiral outer ring 10 and the upper template 1, which has good heat dissipation space and heat dissipation structure, uniform cooling, and adopts indirect contact cooling. The water inlet and outlet are faster, further improving the cooling effect.

[0048] The bottom of the inner cylinder 13 of the preform is fixed by the positioning bottom groove 15 in the base plate 14, so as to avoid the shaking of the inner cylinder 13 of the preform during injection molding, and the stability is strong.

[0049] The two sealing frames 18 fit together to fill and seal the gap between the middle sleeve 16 and the forming upper cylinder 8 to prevent material leakage.

[0050] The fixed support plate 19 supports and fixes the sealing frame 18 to prevent the sealing frame 18 from being in a suspended state, and at the same time seals the middle sleeve 16 and the bottle blank forming inner cylinder 13.

[0051] 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 with similar methods, without departing from the spirit of the present invention.

[0052] Although this document frequently uses terms such as upper template 1, lower template 2, four-hole diverter injection molded part 3, spiral cooling molding upper cylinder assembly 4, preform molding inner cylinder 5, middle molding kit 6, water inlet and outlet 7, molding upper cylinder 8, injection cylinder hole 9, spiral outer ring 10, water inlet and outlet cooling channel 11, heat dissipation space 12, preform molding inner cylinder 13, base plate 14, positioning bottom groove 15, middle sleeve 16, spliced ​​seal 17, sealing frame 18, fixed support plate 19, injection diverter plate 20, and diverter hole 21, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A PET preform injection mold with a spiral cooling mechanism, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: A four-hole diversion injection molding part (3) is provided above the upper template (1); a spiral cooling molding upper cylinder assembly (4) and a bottle blank molding inner cylinder part (5) are provided between the upper template (1) and the lower template (2); the spiral cooling molding upper cylinder assembly (4) is connected to the upper template (1); the bottle blank molding inner cylinder part (5) is connected to the lower template (2); a middle molding kit (6) is provided between the spiral cooling molding upper cylinder assembly (4) and the bottle blank molding inner cylinder part (5); a water inlet and outlet part (7) is provided in the upper template (1); the water inlet and outlet part (7) corresponds to the position of the spiral cooling molding upper cylinder assembly (4).

2. The PET preform injection mold with a spiral cooling mechanism according to claim 1, characterized in that: The spiral cooling molding upper cylinder assembly (4) includes a molding upper cylinder (8) arranged in an upper mold plate (1), an injection cylinder hole (9) is provided in the molding upper cylinder (8), and the outer ring of the molding upper cylinder (8) has a spiral outer ring (10), and the spiral outer ring (10) corresponds to the position of the water inlet and outlet (7).

3. The PET preform injection mold with a spiral cooling mechanism according to claim 2, characterized in that: The water inlet and outlet portion (7) includes four water inlet and outlet cooling channels (11) arranged in the upper template (1). The water inlet and outlet cooling channels (11) pass through the upper template (1), and a heat dissipation space (12) is formed between the spiral outer ring (10) and the upper template (1).

4. The PET preform injection mold with a spiral cooling mechanism according to claim 3, characterized in that: The preform forming inner cylinder (5) comprises a preform forming inner cylinder (13) arranged on the lower template (2), and the top of the preform forming inner cylinder (13) extends into the forming upper cylinder (8).

5. The PET preform injection mold with a spiral cooling mechanism according to claim 4, characterized in that: The bottom of the lower template (2) is provided with a base plate (14), a positioning bottom groove (15) is provided in the base plate (14), and the bottom of the bottle blank forming inner cylinder (13) is snap-fitted with the positioning bottom groove (15).

6. The PET preform injection mold with a spiral cooling mechanism according to claim 5, characterized in that: The middle forming kit (6) includes a middle sleeve (16) arranged between the upper template (1) and the lower template (2); the preform forming inner cylinder (13) passes through the middle sleeve (16); and the bottom of the middle sleeve (16) abuts against the lower template (2).

7. The PET preform injection mold with a spiral cooling mechanism according to claim 6, characterized in that: A splicing seal (17) is provided between the middle sleeve (16) and the forming upper cylinder (8).

8. The PET preform injection mold with a spiral cooling mechanism according to claim 7, characterized in that: The spliced ​​seal (17) comprises two sealing frames (18) arranged between the middle sleeve (16) and the molded upper cylinder (8), and the two sealing frames (18) are fitted together.

9. The PET preform injection mold with a spiral cooling mechanism according to claim 8, characterized in that: A fixed support plate (19) is provided between the sealing frame (18) and the lower template (2), the top of the fixed support plate (19) abuts against the bottom of the sealing frame (18), and the bottom of the fixed support plate (19) abuts against the lower template (2).

10. The PET preform injection mold with a spiral cooling mechanism according to claim 9, characterized in that: The four-hole diversion injection molded part (3) comprises an injection diversion plate (20) arranged above the upper template (1), and the bottom of the injection diversion plate (20) is provided with four diversion holes (21) connected to the injection cylinder holes (9).

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