Degerming mechanism in PET bottle preform injection mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a degerming mechanism in a PET (Polyethylene Terephthalate) bottle preform injection mold. The mold comprises a bottle preform fixed mold and a bottle preform movable mold, and a plurality of bottle preform forming middle cylinders and bottle preform forming lower cylinders are arranged between the bottle preform fixed mold and the bottle preform movable mold. In the injection molding process, the inner degerming auxiliary molding assembly is used for assisting in molding the internal structure of a bottle preform, the cavity positioning anti-deviation piece plays a role in positioning and deviation prevention on the bottle preform molding lower barrel, the cavity position is prevented from deviating, the injection molding precision is improved, the mold is opened after injection molding is completed, the bottle preform movable mold is moved upwards, and the injection molding efficiency is improved. At the moment, the inner degerming auxiliary forming assembly is moved upwards, the formed plastic part is ejected upwards to be demolded through the inner degerming auxiliary forming assembly, inner degerming is achieved, an ejection structure does not need to be additionally arranged, the inner space is saved, the inner structure is simpler, and the layout is more reasonable.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a PET bottle embryo removal mechanism in an injection 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. After the injection molding of the existing PET plastic bottle embryo mold is completed, the molded plastic part needs to be ejected through the ejection structure. The ejection structure is generally arranged below the molding position, and a large space in the mold is required to place the ejection structure. The internal structure is complex and the cost is high. Therefore, it is urgent to design a PET bottle embryo injection mold internal embryo demoulding 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 PET bottle preform removal mechanism in an injection mold.

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

[0006] A PET preform injection mold internal embryo stripping mechanism comprises a preform fixed mold and a preform movable mold, a plurality of preform molding middle cylinders and preform molding lower cylinders are arranged between the preform fixed mold and the preform movable mold, an injection molding connector is arranged above the preform molding middle cylinder, an injection molding part is arranged above the injection molding connector, the preform molding middle cylinder and the preform molding lower cylinder cooperate to form a preform cavity, an internal embryo stripping auxiliary molding component extending into the preform cavity is arranged below the preform molding lower cylinder, and a cavity positioning anti-deviation component is arranged between the preform fixed mold and the preform molding lower cylinder.

[0007] In the above-mentioned internal embryo stripping mechanism of the PET preform injection mold, the internal embryo stripping auxiliary molding component includes a preform molding inner cylinder, the outer diameter of the preform molding inner cylinder is smaller than the inner diameters of the preform molding middle cylinder and the preform molding lower cylinder, and an ejection connector is provided at the bottom of the preform molding inner cylinder.

[0008] In the above-mentioned embryo stripping mechanism in the PET preform injection mold, the ejection connector includes an ejection and embryo stripping rod arranged at the bottom of the inner cylinder of the preform molding.

[0009] In the above-mentioned embryo stripping mechanism in the PET preform injection mold, a fixed base plate is provided below the preform fixed mold, and the ejecting embryo stripping rod extends into the fixed base plate and slidably cooperates with the fixed base plate.

[0010] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, the cavity positioning anti-deviation component includes a positioning anti-deviation plate arranged between the preform fixed mold and the preform molding lower cylinder, and the positioning anti-deviation plate is provided with a plurality of positioning holes, and the preform molding lower cylinder corresponds to the position of the positioning holes and matches the shape.

[0011] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, a middle supporting member is provided on the top of the positioning anti-deflection plate, and the middle supporting member is abutted and matched with the preform molding middle cylinder.

[0012] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, the central supporting member includes a plurality of groups of left and right clamping plates arranged on the top of the positioning anti-deviation plate, each group of left and right clamping plates are fitted together to form a plurality of clamping alignment holes, and the clamping alignment holes are connected to the positioning holes.

[0013] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, a supporting plate is provided on the top of the left and right clamping plates, and the supporting plate is abutted and matched with the bottom of the preform molding middle cylinder.

[0014] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, the injection connector includes an injection connector tube disposed above the preform molding middle cylinder.

[0015] In the above-mentioned PET preform injection mold internal embryo stripping mechanism, the injection molded part includes an injection molding manifold plate and an injection molding main pipe arranged above the injection molding connecting pipe, and the injection molding manifold plate is connected to the injection molding connecting pipe.

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

[0017] 1. In the injection molding process, the utility model brings the preform fixed mold and the preform movable mold close to each other, so that the preform molding middle cylinder and the preform molding lower cylinder cooperate to form a preform cavity, the molten material is injected through the injection molding part, and then the molten material is sent into the preform cavity through the injection molding connector, and the internal demolding auxiliary molding component is used to assist in molding the internal structure of the preform, and the cavity positioning and anti-biasing component plays a positioning and anti-biasing role on the preform molding lower cylinder to avoid the displacement of the cavity position and improve the accuracy of injection molding. After the injection molding is completed, the mold is opened and the preform movable mold is moved upward. At this time, the internal demolding auxiliary molding component is moved upward, and the molded plastic part is ejected and demolded upward by the internal demolding auxiliary molding component to realize internal demolding, without the need to set an additional ejection structure, saving internal space, and the internal structure is simpler and the layout is more reasonable.

[0018] 2. During injection molding, the left and right clamping plates and the supporting plate support the bottle preform forming middle cylinder, thereby preventing the bottle preform forming middle cylinder from sliding up and down, and having strong stability.

[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 partial structural schematic diagram of the utility model in another direction.

[0024] In the figure: preform fixed mold 1, preform movable mold 2, preform molding middle cylinder 3, preform molding lower cylinder 4, injection molding connector 5, injection molding part 6, internal preform stripping auxiliary molding component 7, cavity positioning anti-deviation part 8, preform molding inner cylinder 9, ejection connector 10, ejection stripping rod 11, fixed base plate 12, positioning anti-deviation plate 13, positioning hole 14, middle supporting part 15, left and right clamping plates 16, clamping alignment hole 17, supporting plate 18, injection molding connecting pipe 19, injection molding diverter plate 20, injection molding main pipe 21. DETAILED DESCRIPTION

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

[0026] like Figure 1-4As shown, a PET preform injection mold internal embryo stripping mechanism comprises a preform fixed mold 1 and a preform movable mold 2, a plurality of preform molding middle cylinders 3 and preform molding lower cylinders 4 are arranged between the preform fixed mold 1 and the preform movable mold 2, an injection molding connector 5 is arranged above the preform molding middle cylinder 3, an injection molding part 6 is arranged above the injection molding connector 5, the preform molding middle cylinder 3 and the preform molding lower cylinder 4 cooperate to form a preform cavity, an internal embryo stripping auxiliary molding component 7 extending into the preform cavity is arranged below the preform molding lower cylinder 4, and a cavity positioning anti-deviation component 8 is arranged between the preform fixed mold 1 and the preform molding lower cylinder 4.

[0027] In this embodiment, during the injection molding process, the preform fixed mold 1 and the preform movable mold 2 are brought close to each other, so that the preform molding middle cylinder 3 and the preform molding lower cylinder 4 cooperate to form a preform cavity, and the molten material is injected through the injection molding part 6, and then the molten material is sent into the preform cavity through the injection molding connector 5, and the internal demolding auxiliary molding component 7 is used to assist in molding the internal structure of the preform. The cavity positioning and anti-deviation component 8 plays a positioning and anti-deviation role on the preform molding lower cylinder 4 to avoid the displacement of the cavity position and improve the injection molding accuracy. After the injection molding is completed, the mold is opened and the preform movable mold 2 is moved upward. At this time, the internal demolding auxiliary molding component 7 is moved upward, and the molded plastic part is ejected and demolded upward by the internal demolding auxiliary molding component 7 to achieve internal demolding. There is no need to set an additional ejection structure, saving internal space, and the internal structure is simpler and the layout is more reasonable.

[0028] Combination Figure 1-4 As shown, the inner preform stripping auxiliary molding component 7 includes a preform molding inner cylinder 9, the outer diameter of the preform molding inner cylinder 9 is smaller than the inner diameters of the preform molding middle cylinder 3 and the preform molding lower cylinder 4, and an ejection connector 10 is provided at the bottom of the preform molding inner cylinder 9.

[0029] Specifically, during the injection molding process, the preform molding middle cylinder 3, the preform molding lower cylinder 4 and the preform molding inner cylinder 9 cooperate to mold plastic parts. After the injection molding is completed, the mold is opened, and the ejection connector 10 is moved upward. The ejection connector 10 drives the preform molding inner cylinder 9 to move upward, and the molded plastic parts are ejected upward and demolded to achieve internal demolding. There is no need to set up an additional ejection structure, which saves internal space, makes the internal structure simpler, and makes the layout more reasonable.

[0030] The ejector connector 10 includes an ejector stripping rod 11 disposed at the bottom of the preform forming inner cylinder 9 .

[0031] In this embodiment, after the injection molding is completed, the mold is opened, and the ejector-stripping rod 11 is moved upward. The ejector-stripping rod 11 drives the preform molding inner cylinder 9 to move upward, and the molded plastic part is ejected upward to realize internal demolding. There is no need to set up an additional ejector structure, which saves internal space, makes the internal structure simpler, and makes the layout more reasonable.

[0032] Combination Figure 1 , Figure 3 As shown, a fixed base plate 12 is disposed below the preform fixed mold 1 , and the ejector and stripper rod 11 extends into the fixed base plate 12 and slidably cooperates with the fixed base plate 12 .

[0033] In this embodiment, the fixed base plate 12 is used to fix the ejecting and stripping rod 11 .

[0034] The cavity positioning anti-deviation member 8 includes a positioning anti-deviation plate 13 disposed between the preform fixed mold 1 and the preform molding lower cylinder 4 , wherein the positioning anti-deviation plate 13 is provided with a plurality of positioning holes 14 , and the preform molding lower cylinder 4 corresponds to the position of the positioning holes 14 and has a matching shape.

[0035] In this embodiment, during injection molding, the preform molding lower cylinder 4 is positioned by the positioning anti-deviation plate 13 and the positioning hole 14 to avoid the position of the cavity from being offset, thereby improving the precision of injection molding.

[0036] Combination Figure 2 As shown, a middle supporting member 15 is disposed on the top of the positioning anti-deflection plate 13 , and the middle supporting member 15 is in abutment with the preform molding middle cylinder 3 .

[0037] In this embodiment, during injection molding, the middle supporting member 15 supports the bottle preform molding middle cylinder 3 to prevent the bottle preform molding middle cylinder 3 from sliding up and down, and has strong stability.

[0038] The middle supporting member 15 includes a plurality of groups of left and right clamping plates 16 arranged on the top of the positioning anti-deviation plate 13, and each group of left and right clamping plates 16 are fitted together to form a plurality of clamping alignment holes 17, and the clamping alignment holes 17 are connected to the positioning holes 14, and a supporting plate 18 is provided on the top of the left and right clamping plates 16, and the supporting plate 18 is in contact with the bottom of the bottle embryo molding middle tube 3.

[0039] In this embodiment, during injection molding, the left and right clamping plates 16 and the supporting plate 18 support the preform molding middle cylinder 3 to prevent the preform molding middle cylinder 3 from sliding up and down, and the stability is relatively strong.

[0040] Combination Figure 1-4 As shown, the injection molding connector 5 includes an injection molding connector tube 19 disposed above the preform molding middle tube 3, and the injection molding part 6 includes an injection molding manifold plate 20 and an injection molding main tube 21 disposed above the injection molding connector tube 19, and the injection molding manifold plate 20 is connected to the injection molding connector tube 19.

[0041] In this embodiment, during injection molding, the molten material is injected into the injection molding manifold plate 20 through the injection molding main pipe 21 for diversion, and then the molten material is delivered into the mold cavity through the injection molding connecting pipe 19 .

[0042] The working principle of the utility model is:

[0043] During the injection molding process, the preform fixed mold 1 and the preform movable mold 2 are brought close to each other, so that the preform molding middle cylinder 3 and the preform molding lower cylinder 4 cooperate to form a preform molding cavity, and the molten material is injected into the injection molding diverter plate 20 through the injection molding main pipe 21 for diversion, and then the molten material is sent into the cavity through the injection molding connecting pipe 19, and the preform molding inner cylinder 9 is used to assist in molding the internal structure of the preform. After the injection molding is completed, the mold is opened, and the ejection and stripping rod 11 is moved upward. The ejection and stripping rod 11 drives the preform molding inner cylinder 9 to move upward, and the molded plastic part is ejected and demolded upward to realize internal demolding. No additional ejection structure is required, which saves internal space, makes the internal structure simpler, and has a more reasonable layout. The fixed base plate 12 is used to fix the ejection and stripping rod 11.

[0044] During injection molding, the preform molding lower cylinder 4 is positioned by the positioning anti-deviation plate 13 and the positioning hole 14 to avoid the position of the cavity from being offset and to improve the precision of injection molding. The left and right clamping plates 16 and the supporting plate 18 support the preform molding middle cylinder 3 to avoid the preform molding middle cylinder 3 from sliding up and down, and the stability is relatively strong.

[0045] 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.

[0046] Although the present invention uses the terms such as preform fixed mold 1, preform movable mold 2, preform molding middle cylinder 3, preform molding lower cylinder 4, injection molding connector 5, injection molding part 6, internal stripping auxiliary molding component 7, cavity positioning anti-deviation part 8, preform molding inner cylinder 9, ejection connector 10, ejection stripping rod 11, fixed base plate 12, positioning anti-deviation plate 13, positioning hole 14, middle supporting part 15, left and right clamping plates 16, clamping alignment hole 17, supporting plate 18, injection molding connecting pipe 19, injection molding manifold plate 20, injection molding main pipe 21, etc. more frequently, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention, and interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A PET preform injection mold internal embryo stripping mechanism, comprising a preform fixed mold (1) and a preform movable mold (2), characterized in that: A plurality of preform molding middle cylinders (3) and preform molding lower cylinders (4) are arranged between the preform fixed mold (1) and the preform movable mold (2); an injection molding connector (5) is arranged above the preform molding middle cylinder (3); an injection molding part (6) is arranged above the injection molding connector (5); the preform molding middle cylinder (3) and the preform molding lower cylinder (4) cooperate to form a preform molding cavity; an internal preform stripping auxiliary molding component (7) extending into the preform molding cavity is arranged below the preform molding lower cylinder (4); and a cavity positioning anti-deviation component (8) is arranged between the preform fixed mold (1) and the preform molding lower cylinder (4).

2. The PET preform injection mold internal embryo stripping mechanism according to claim 1, characterized in that: The inner preform stripping auxiliary molding component (7) comprises a preform molding inner cylinder (9), the outer diameter of the preform molding inner cylinder (9) being smaller than the inner diameters of the preform molding middle cylinder (3) and the preform molding lower cylinder (4), and an ejection connector (10) is provided at the bottom of the preform molding inner cylinder (9).

3. The PET preform injection mold internal embryo stripping mechanism according to claim 2, characterized in that: The ejection connection member (10) comprises an ejection and stripping rod (11) arranged at the bottom of the preform forming inner cylinder (9).

4. The PET preform injection mold internal embryo stripping mechanism according to claim 3, characterized in that: A fixed base plate (12) is provided below the preform fixed mold (1), and the ejector and stripping rod (11) extends into the fixed base plate (12) and is slidably matched with the fixed base plate (12).

5. The PET preform injection mold internal embryo stripping mechanism according to claim 4, characterized in that: The cavity positioning anti-deviation member (8) comprises a positioning anti-deviation plate (13) arranged between the preform fixed mold (1) and the preform molding lower cylinder (4), wherein a plurality of positioning holes (14) are arranged in the positioning anti-deviation plate (13), and the preform molding lower cylinder (4) and the positioning holes (14) correspond in position and have matching shapes.

6. The PET preform injection mold internal embryo stripping mechanism according to claim 5, characterized in that: A middle supporting member (15) is provided on the top of the positioning anti-deflection plate (13), and the middle supporting member (15) is in abutment with the bottle preform forming middle cylinder (3).

7. The PET preform injection mold internal embryo removal mechanism according to claim 6, characterized in that: The middle supporting member (15) comprises a plurality of groups of left and right clamping plates (16) arranged on the top of the positioning anti-deflection plate (13), each group of left and right clamping plates (16) are fitted together to form a plurality of clamping alignment holes (17), and the clamping alignment holes (17) are connected to the positioning holes (14).

8. The PET preform injection mold internal embryo removal mechanism according to claim 7, characterized in that: A supporting plate (18) is provided on the top of the left and right clamping plates (16), and the supporting plate (18) is in abutment with the bottom of the preform forming middle cylinder (3).

9. The PET preform injection mold internal embryo stripping mechanism according to claim 1, characterized in that: The injection molding connector (5) comprises an injection molding connector tube (19) arranged above the preform molding middle cylinder (3).

10. The PET preform injection mold internal embryo stripping mechanism according to claim 9, characterized in that: The injection molded part (6) comprises an injection molded flow divider plate (20) and an injection molded main pipe (21) arranged above the injection molded connecting pipe (19), and the injection molded flow divider plate (20) is connected to the injection molded connecting pipe (19).

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