Oil cylinder ejection mechanism of ultra-long bottle preform injection mold

Abstract

The utility model provides an oil cylinder ejection mechanism of an ultra-long bottle preform injection mold, and belongs to the technical field of molds. The mold comprises an upper mold plate and a lower mold plate, two bottle blank forming assemblies are arranged between the upper mold plate and the lower mold plate, each bottle blank forming assembly comprises four bottle blank forming assemblies distributed in a straight line, and each bottle blank forming assembly comprises a mold cavity, a mold cavity flange, a mold lip piece and a mold core base which are sequentially arranged from top to bottom; the die cavity flange is fixed to the bottom of the die cavity body and fixed to the upper die plate, and the die core vertically penetrates through the die core base and is inserted into the die cavity body. Each group comprises four bottle blank forming assemblies, four bottle blanks can be formed in an injection molding mode at a time, external threads can be formed at bottle openings of the bottle blanks through external thread forming structures in the mold lip pieces, and after a product is formed in an injection molding mode, the linkage type mold lip demolding assemblies can drive the four mold lip pieces in the same group to be synchronously demolded at the same time. The number of mold lip demolding assemblies in the mold is reduced, and the mold cost can be effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an oil cylinder ejection mechanism of an ultra-long bottle embryo injection mold. Background Art

[0002] When a plastic bottle preform is injection molded, a thread forming structure capable of forming an external thread on the outside of the bottle mouth is provided in the mold lip of the mold, so the mold lip is generally composed of two half-mold lips. After the bottle preform is injection molded, the external thread portion of the bottle preform can be demolded by translating the two half-mold lips. However, the mold in the prior art generally has multiple bottle preform molding components, and it is costly to have an independent demolding component at the mold lip of each bottle preform molding component.

[0003] For example, a Chinese patent discloses a preform injection mold [application number: 202223602437.1], comprising a fixed mold group, in which a fixed mold cooling cavity is provided, and a fixed mold is installed in the fixed mold cooling cavity; a movable mold group, in which a core assembly is provided, and a movable mold cooling cavity is provided in the core assembly; a mold cavity for molding a preform is formed between the fixed mold and the core assembly; wherein the fixed mold group at least comprises: a fixed mold plate, in which a plurality of the fixed mold cooling cavities are opened, and a plurality of water inlet channels 1 and water outlet channels 1 are provided on the fixed mold plate; the one water inlet channel 1 and the one water outlet channel 1 are correspondingly connected to two adjacent fixed mold cooling cavities. Utility Model Content

[0004] The utility model aims to solve the above problems and provides an oil cylinder ejection mechanism for an ultra-long preform injection mold.

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

[0006] A super-long preform injection mold oil cylinder ejection mechanism comprises an upper template and a lower template, two groups of preform molding components are arranged between the upper template and the lower template, each group of preform molding components comprises four preform molding components distributed in a straight line, the preform molding components comprise a mold cavity body, a mold cavity flange, a mold lip piece and a mold core seat arranged in sequence from top to bottom, the mold cavity flange is fixed to the bottom of the mold cavity body and the mold cavity flange is fixed to the upper template, and also comprises a mold core vertically penetrating the mold core seat and inserted into the mold cavity body, the mold core and the mold core seat are sealingly connected, an external thread molding structure is arranged in the mold lip piece, the mold lip piece is formed by combining two half mold lips, and a linkage mold lip demoulding component is arranged on the lower template.

[0007] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, the linked mold lip demolding assembly includes a front mold lip fixing plate and a rear mold lip fixing plate that can drive the mold lip parts in the four preform molding parts in the same group to demold, and the two half mold lips constituting the mold lip parts are respectively connected to the front mold lip fixing plate and the rear mold lip fixing plate.

[0008] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, two inner sliding rods and two outer sliding rods are also arranged in parallel on the lower mold plate, the two ends of the front mold lip fixing plate are respectively connected to the two outer sliding rods, the two ends of the rear mold lip fixing plate are respectively connected to the two inner sliding rods, and the front mold lip fixing plates in the two groups of preform molding assemblies are fixed on the outer sliding rods, and the rear mold lip fixing plates in the two groups of preform molding assemblies are fixed on the inner sliding rods.

[0009] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, slide bar mounting grooves for mounting inner slide bars and outer slide bars are further provided on both sides of the lower mold plate, a limit rod with a T-shaped cross-section is provided in the middle of the slide bar mounting groove, the inner slide bar and the outer slide bar are respectively arranged on both sides of the limit rod, and the inner slide bar and the outer slide bar are both provided with limit parts that abut against the limit rod.

[0010] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, the mold cavity is arranged in the upper mold plate, an outer spiral cooling structure is arranged between the upper mold plate and the mold cavity; and an inner spiral cooling structure is arranged in the mold core.

[0011] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, the external spiral cooling structure includes an external cooling channel spirally arranged on the outer surface of the mold cavity body, and the upper mold plate is provided with external inlet and outlet liquid channels connected to the upper and lower ends of the external cooling channel.

[0012] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, the inner spiral cooling structure includes a core water pipe vertically inserted into the mold core, the outer wall of the core water pipe and the inner wall of the core are against each other, a core water channel is penetrated through the core water pipe, a spiral inner cooling channel is arranged on the outer wall of the core water pipe, the inner cooling channel is connected to the top of the core water channel, and the lower mold plate is provided with an inner liquid inlet channel connected to the bottom of the core water pipe.

[0013] In the above-mentioned super-long preform injection mold oil cylinder ejection mechanism, the core seat is provided with a No. 1 drainage channel connected to the bottom of the internal cooling channel in the core, the rear mold lip fixing plate is provided with a No. 2 drainage channel connected to the No. 1 drainage channel, and the inner slide rod is provided with a No. 3 drainage channel connected to the No. 2 drainage channel.

[0014] In the above-mentioned cylinder ejection mechanism of the super-long preform injection mold, a bottom plate is also provided on the lower side of the lower template, a top plate driven by a lifting mechanism is provided on the bottom plate, and a plurality of groups of ejector rod assemblies corresponding to the core seat are provided on the top plate, the ejector rod assemblies include a plurality of straight ejector rods arranged along the circumferential direction, the top ends of the straight ejector rods pass through the lower template and are connected to the bottom of the core seat, the lifting mechanism includes two lifting cylinders symmetrically arranged on both sides of the bottom plate, the lifting cylinders are fixed on the top plate, and the output shaft ends of the lifting cylinders pass through the top plate and are fixedly connected to the bottom plate.

[0015] In the above-mentioned oil cylinder ejection mechanism of the super-long preform injection mold, the external thread molding structure includes an external thread molding groove arranged at the bottom of the inner wall of the mold lip.

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

[0017] 1. Two groups, each with four preform molding components, can injection mold four preforms at one time. The external thread molding structure in the lip part can mold external threads at the bottle mouth of the preform. After the product is injection molded, the linkage lip demoulding component can simultaneously drive the four lip parts in the same group to demould synchronously, reducing the number of lip demoulding components in the mold and effectively reducing the mold cost.

[0018] 2. The movement of the front lip fixing plate and the rear lip fixing plate can respectively drive the two half lips constituting the lip parts to move. At the same time, driving the front lip fixing plate and the rear lip fixing plate to move away from the preform molding assembly can demould the lip parts in the four preform molding assemblies in the same group, so that multiple preform molding assemblies can share one demoulding assembly, which can reduce the mold cost.

[0019] 3. The movement of the inner slide bar can drive the movement of the rear die lip fixing plate, and the movement of the outer slide bar can drive the movement of the front die lip fixing plate. The front die lip fixing plate and the rear die lip fixing plate corresponding to the two sets of preform molding assemblies are fixed on the same outer slide bar and inner slide bar respectively, so that the eight die lip parts in the two sets of preform molding assemblies can be demolded at the same time.

[0020] 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

[0021] Figure 1 It is a partial cross-sectional view of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of the utility model;

[0023] Figure 3 It is a schematic diagram of the connection between the mold core and the mold core seat;

[0024] Figure 4 It is a structural diagram of the core water pipe.

[0025] In the figure, an upper mold plate 1, a lower mold plate 2, a preform molding assembly 3, a mold cavity body 4, a mold cavity flange 5, a mold lip piece 6, a mold core seat 7, a mold core 8, a half mold lip 10, a linked mold lip demolding assembly 11, a front mold lip fixing plate 12, a rear mold lip fixing plate 13, an inner slide bar 14, an outer slide bar 15, a limit rod 17, a limit portion 18, an external cooling channel 19, a core water pipe 21, a core water channel 22, an inner cooling channel 23, an inner liquid inlet channel 24, a No. 1 drainage channel 25, a No. 3 drainage channel 26, a bottom plate 27, a top plate 28, a straight ejector rod 29, a lifting cylinder 30, and an external thread molding groove 31. DETAILED DESCRIPTION

[0026] like Figure 1-Figure 4 As shown, an extra-long preform injection mold oil cylinder ejection mechanism includes an upper template 1 and a lower template 2, two groups of preform molding components 3 are arranged between the upper template 1 and the lower template 2, each group of preform molding components 3 includes four preform molding components 3 distributed in a straight line, the preform molding components 3 include a mold cavity body 4, a mold cavity flange 5, a mold lip piece 6 and a mold core seat 7 arranged in sequence from top to bottom, the mold cavity flange 5 is fixed to the bottom of the mold cavity body 4 and the mold cavity flange 5 is fixed to the upper template 1, and also includes a mold core 8 vertically penetrating the mold core seat 7 and inserted into the mold cavity body 4, the mold core 8 and the mold core seat 7 are sealed and connected, the mold lip piece 6 is provided with an external thread molding structure, the mold lip piece 6 is formed by combining two half mold lips 10, and a linkage mold lip demolding component 11 is provided on the lower template 2.

[0027] In the utility model, two groups, each with four preform molding components 3, can injection mold eight preforms at one time, and the external thread molding structure in the lip piece 6 can mold external threads at the bottle mouth of the preform. After the product is injection molded, the linked lip demolding component 11 can simultaneously drive the four lip pieces in the same group to demold synchronously, thereby reducing the number of lip demolding components in the mold and effectively reducing the mold cost.

[0028] Specifically, the linkage type die lip demoulding assembly 11 includes a front die lip fixing plate 12 and a rear die lip fixing plate 13 which can drive the die lip members 6 in the same group of four preform molding assemblies 3 to demould, and the two half-die lips 10 constituting the die lip member 6 are respectively connected to the front die lip fixing plate 12 and the rear die lip fixing plate 13. The movement of the front die lip fixing plate 12 and the rear die lip fixing plate 13 can respectively drive the two half-die lips 10 constituting the die lip member 6 to move, and at the same time, driving the front die lip fixing plate 12 and the rear die lip fixing plate 13 to move away from the preform molding assembly 3 can demould the die lip members 6 in the same group of four preform molding assemblies 3, so that multiple preform molding assemblies 3 can share one demoulding assembly, which can reduce the mold cost.

[0029] Preferably, two inner slide bars 14 and two outer slide bars 15 are also arranged in parallel on the lower mold plate 2, the two ends of the front die lip fixing plate 12 are respectively connected to the two outer slide bars 15, the two ends of the rear die lip fixing plate 13 are respectively connected to the two inner slide bars 14, and the front die lip fixing plates 12 in the two groups of preform molding assemblies 3 are fixed on the outer slide bars 15, and the rear die lip fixing plates 13 in the two groups of preform molding assemblies 3 are fixed on the inner slide bars 14. The movement of the inner slide bars can drive the movement of the rear die lip fixing plate 13, and the movement of the outer slide bars 15 can drive the movement of the front die lip fixing plate 12. The front die lip fixing plates 12 and the rear die lip fixing plates 13 corresponding to the two groups of preform molding assemblies 3 are respectively fixed on the same outer slide bars and inner slide bars, so that the eight die lip parts in the two groups of preform molding assemblies 3 can be demolded simultaneously.

[0030] Specifically, both sides of the lower template 2 are provided with slide bar installation grooves for installing the inner slide bar 14 and the outer slide bar 15, and a limit rod 17 with a T-shaped cross section is provided in the middle of the slide bar installation groove, and the inner slide bar 14 and the outer slide bar 15 are respectively arranged on both sides of the limit rod 17, and the inner slide bar 14 and the outer slide bar 15 are provided with a limit portion 18 that abuts against the limit rod 17. The limit rod 17 cooperates with the limit portions on the inner slide bar and the outer slide bar to limit the inner slide bar 14 and the outer slide bar 15.

[0031] Preferably, the mold cavity 4 is arranged in the upper mold plate 1, and an outer spiral cooling structure is arranged between the upper mold plate 1 and the mold cavity 4; an inner spiral cooling structure is arranged in the mold core 8. The outer spiral cooling structure and the inner spiral cooling structure can cool the preform in the preform molding assembly 3 from both the inside and the outside at the same time, which can improve the cooling efficiency.

[0032] Specifically, the external spiral cooling structure includes an external cooling channel 19 which is spirally arranged on the outer surface of the mold cavity 4, and the upper mold plate 1 is provided with external inlet and outlet liquid channels connected to the upper and lower ends of the external cooling channel 19. Cooling liquid can be injected into the external cooling channel 19 through the external inlet and outlet liquid channels, so that the preform can be cooled from the outside to the inside. The spiral arrangement of the external cooling channel 19 can increase the travel of the cooling liquid and thus improve the utilization rate of the cooling liquid.

[0033] Specifically, the internal spiral cooling structure includes a core water pipe 21 vertically inserted into the core 8, the outer wall of the core water pipe 21 is against the inner wall of the core 8, a core water channel 22 is penetrated through the core water pipe 21, a spiral internal cooling channel 23 is provided on the outer wall of the core water pipe 21, the internal cooling channel 23 is connected to the top of the core water channel 22, and the lower mold plate 2 is provided with an internal liquid inlet channel 24 connected to the bottom of the core water pipe 21. The coolant can be injected into the core water channel 22 in the core water pipe 21 through the internal liquid inlet channel, and then flow into the internal cooling channel through the top of the core water channel 22 to cool the bottle embryo from the inside to the outside. The spiral arrangement of the internal cooling channel can increase the stroke of the coolant and thus improve the utilization rate of the coolant; the core seat 7 is provided with a No. 1 drainage channel 25 connected to the bottom of the internal cooling channel 23 in the core 8, the rear die lip fixing plate 13 is provided with a No. 2 drainage channel connected to the No. 1 drainage channel 25, and the inner slide bar 14 is provided with a No. 3 drainage channel 26 connected to the No. 2 drainage channel. The coolant flowing into the bottom of the inner cavity of the mold core from the bottom of the inner cooling channel can be discharged outward through the No. 1 drainage channel 25, the No. 2 drainage channel and the No. 3 drainage channel 26. The coolant is discharged through the No. 2 drainage channel in the rear mold lip fixing plate 13, so that the coolants corresponding to the four preform molding components 3 can merge and finally be discharged outward uniformly through the No. 3 drainage channel 26 in the inner slide bar 14.

[0034] Specifically, a bottom plate 27 is further provided on the lower side of the lower template 2, and a top plate 28 driven by a lifting mechanism is provided on the bottom plate 27, and a plurality of groups of ejector rod assemblies corresponding to the core seat 7 are provided on the top plate 28, and the ejector rod assemblies include a plurality of straight ejector rods 29 arranged along the circumferential direction, and the top ends of the straight ejector rods 29 penetrate the lower template 2 and are connected to the bottom of the core seat 7, and the lifting mechanism includes two lifting oil cylinders 30 symmetrically arranged on both sides of the bottom plate 27, and the lifting oil cylinders 30 are fixed on the top plate 28, and the output shaft ends of the lifting oil cylinders 30 penetrate the top plate 28 and are fixedly connected to the bottom plate 27. The synchronous action of the two lifting oil cylinders can drive the top plate to rise and fall in the vertical direction, and the upward movement of the top plate can drive the ejector rods to move vertically upward, thereby pushing the core seat upward, so that the preform sleeved on the core can be ejected.

[0035] Specifically, the external thread forming structure includes an external thread forming groove 31 arranged at the bottom of the inner wall of the die lip 6 .

[0036] The working principle of the utility model is as follows: two groups each having four preform molding components 3 can form eight preforms at one time, and the external thread molding structure in the die lip member 6 can form external threads at the bottle mouth of the bottle preform. After the product is injection molded, the linkage die lip demoulding component 11 can simultaneously drive the four die lip members in the same group to demould synchronously, thereby reducing the number of die lip demoulding components in the mold and effectively reducing the mold cost.

[0037] The movement of the front die lip fixing plate 12 and the rear die lip fixing plate 13 can respectively drive the two half die lips 10 constituting the die lip member 6 to move, and at the same time, driving the front die lip fixing plate 12 and the rear die lip fixing plate 13 to move away from the bottle preform molding assembly 3 can demould the die lip members 6 in the four bottle preform molding assemblies 3 in the same group, so that multiple bottle preform molding assemblies 3 can share a demoulding assembly, which can reduce the mold cost, the movement of the inner slide bar can drive the movement of the rear die lip fixing plate 13, and the movement of the outer slide bar 15 can drive the movement of the front die lip fixing plate 12, and the front die lip fixing plates 12 and the rear die lip fixing plates 13 corresponding to the two groups of bottle preform molding assemblies 3 are respectively fixed on the same outer slide bar and the inner slide bar, so that the eight die lip members in the two groups of bottle preform molding assemblies 3 can be demoulded at the same time, and the limiting rod 17 cooperates with the limiting parts on the inner slide bar and the outer slide bar to limit the inner slide bar 14 and the outer slide bar 15;

[0038] The outer spiral cooling structure and the inner spiral cooling structure can cool the preform in the preform molding assembly 3 from both the inside and the outside at the same time, and can improve the cooling efficiency. The coolant can be injected into the outer cooling channel 19 through the outer inlet and outlet channels, so that the preform can be cooled from the outside to the inside. The outer cooling channel 19 is arranged in a spiral shape, which can increase the stroke of the coolant and thus improve the utilization rate of the coolant. The coolant can be injected into the core water channel 22 in the core water pipe 21 through the inner liquid inlet channel, and then flow into the inner cooling channel through the top of the core water channel 22 to cool the preform from the inside to the outside. The inner cooling channel is arranged in a spiral shape, which can increase the stroke of the coolant. The coolant is discharged through the No. 2 drainage channel in the rear die lip fixing plate 13, so that the coolants corresponding to the four preform molding components 3 can be combined and finally discharged uniformly through the No. 3 drainage channel 26 in the inner slide bar 14. The synchronous action of the two lifting cylinders can drive the top plate to rise and fall in the vertical direction. The upward movement of the top plate can drive the ejector rod to move vertically upward, thereby pushing the core seat to move upward, so that the preform sleeved on the core can be ejected.

[0039] 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, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0040] Although this article uses the upper template 1, the lower template 2, the bottle embryo molding assembly 3, the mold cavity 4, the mold cavity flange 5, the mold lip part 6, the mold core seat 7, the mold core 8, the half mold lip 10, the linked mold lip demolding assembly 11, the front mold lip fixing plate 12, the rear mold lip fixing plate 13, the inner slide bar 14, the outer slide bar 15, the limit rod 17, the limit part 18, the external cooling channel 19, the core water pipe 21, the core water channel 22, the inner cooling channel 23, the inner liquid inlet channel 24, the No. 1 drainage channel 25, the No. 3 drainage channel 26, the bottom plate 27, the top plate 28, the straight push rod 29, the lifting cylinder 30, the external thread molding groove 31, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An extra-long preform injection mold oil cylinder ejection mechanism, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: Two groups of preform molding components (3) are arranged between the upper template (1) and the lower template (2), each group of preform molding components (3) includes four preform molding components (3) distributed in a straight line, the preform molding components (3) include a mold cavity body (4), a mold cavity flange (5), a mold lip member (6) and a mold core seat (7) arranged in sequence from top to bottom, the mold cavity flange (5) is fixed to the bottom of the mold cavity body (4) and the mold cavity flange (5) is fixed to the upper template (1), and also includes a mold core (8) vertically penetrating the mold core seat (7) and inserted into the mold cavity body (4), the mold core (8) and the mold core seat (7) are sealed and connected, the mold lip member (6) is provided with an external thread molding structure, the mold lip member (6) is formed by combining two half mold lips (10), and the lower template (2) is provided with a linked mold lip demoulding component (11).

2. The super-long preform injection mold oil cylinder ejection mechanism according to claim 1, characterized in that: The linked die lip demoulding assembly (11) comprises a front die lip fixing plate (12) and a rear die lip fixing plate (13) which can drive the die lip parts (6) in the four preform molding assemblies (3) in the same group to demould, and the two half die lips (10) constituting the die lip parts (6) are respectively connected to the front die lip fixing plate (12) and the rear die lip fixing plate (13).

3. The super-long preform injection mold oil cylinder ejection mechanism according to claim 2, characterized in that: The lower mold plate (2) is also provided with two inner sliding bars (14) and two outer sliding bars (15) in parallel, the two ends of the front mold lip fixing plate (12) are respectively connected to the two outer sliding bars (15), the two ends of the rear mold lip fixing plate (13) are respectively connected to the two inner sliding bars (14), and the front mold lip fixing plates (12) in the two groups of bottle preform molding assemblies (3) are both fixed on the outer sliding bars (15), and the rear mold lip fixing plates (13) in the two groups of bottle preform molding assemblies (3) are both fixed on the inner sliding bars (14).

4. The super-long preform injection mold oil cylinder ejection mechanism according to claim 3, characterized in that: The lower template (2) is also provided with slide bar installation grooves for installing the inner slide bar (14) and the outer slide bar (15), and a limit rod (17) with a T-shaped cross section is provided in the middle of the slide bar installation groove. The inner slide bar (14) and the outer slide bar (15) are respectively arranged on both sides of the limit rod (17), and the inner slide bar (14) and the outer slide bar (15) are both provided with a limit portion (18) that abuts against the limit rod (17).

5. The super-long preform injection mold oil cylinder ejection mechanism according to claim 3, characterized in that: The mold cavity (4) is arranged in the upper mold plate (1), and an external spiral cooling structure is arranged between the upper mold plate (1) and the mold cavity (4); an internal spiral cooling structure is arranged in the mold core (8).

6. The super-long preform injection mold oil cylinder ejection mechanism according to claim 5, characterized in that: The external spiral cooling structure comprises an external cooling channel (19) spirally arranged on the outer surface of the mold cavity (4), and the upper mold plate (1) is provided with external inlet and outlet liquid channels connected to the upper and lower ends of the external cooling channel (19).

7. The super-long preform injection mold oil cylinder ejection mechanism according to claim 5, characterized in that: The inner spiral cooling structure comprises a core water pipe (21) vertically inserted into the core (8), the outer wall of the core water pipe (21) abuts against the inner wall of the core (8), a core water channel (22) is provided through the core water pipe (21), a spiral inner cooling channel (23) is provided on the outer wall of the core water pipe (21), the inner cooling channel (23) and the top of the core water channel (22) are connected, and the lower mold plate (2) is provided with an inner liquid inlet channel (24) connected to the bottom of the core water pipe (21).

8. The super-long preform injection mold oil cylinder ejection mechanism according to claim 7, characterized in that: The core seat (7) is provided with a No. 1 drainage channel (25) connected to the bottom of the internal cooling channel (23) in the core (8), the rear die lip fixing plate (13) is provided with a No. 2 drainage channel connected to the No. 1 drainage channel (25), and the inner slide bar (14) is provided with a No. 3 drainage channel (26) connected to the No. 2 drainage channel.

9. The super-long preform injection mold oil cylinder ejection mechanism according to claim 1, characterized in that: A bottom plate (27) is also provided on the lower side of the lower template (2), and a top plate (28) driven by a lifting mechanism is provided on the bottom plate (27), and a plurality of groups of push rod assemblies corresponding to the core seat (7) are provided on the top plate (28), and the push rod assemblies include a plurality of straight push rods (29) arranged along the circumferential direction, and the top ends of the straight push rods (29) pass through the lower template (2) and are connected to the bottom of the core seat (7), and the lifting mechanism includes two lifting cylinders (30) symmetrically arranged on both sides of the bottom plate (27), and the lifting cylinders (30) are fixed on the top plate (28), and the output shaft end of the lifting cylinder (30) passes through the top plate (28) and is fixed to the bottom plate (27).

10. The super-long preform injection mold oil cylinder ejection mechanism according to claim 1, characterized in that: The external thread forming structure comprises an external thread forming groove (31) arranged at the bottom of the inner wall of the die lip piece (6).

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