PET preform injection mold glue feeding mechanism

Abstract

The utility model provides a glue feeding mechanism of a PET preform injection mold, which belongs to the field of mold technology. It includes a mold main body, wherein a plurality of composite cavity components and a diversion injection molding component connected to the plurality of composite cavity components are arranged in the mold main body, wherein the composite cavity component includes an upper cover plate, an annular insert, an intermediate insert and a lower sealing plate arranged in sequence from top to bottom, and a molding cavity is arranged between the upper cover plate, the annular insert, the intermediate insert and the lower sealing plate. The molding cavity in the composite cavity component composed of the upper cover plate, the annular insert, the intermediate insert and the lower sealing plate can injection mold the PET preform, and the diversion injection molding component can divert the injection liquid into the molding cavities in the plurality of composite cavity components. The double-layer hot runner thermal auxiliary structure arranged on the upper cover plate can heat the glue inlet after the high-temperature gas is introduced to ensure the temperature of the injection liquid at the glue inlet, and the thermal auxiliary effect is better than that of the single-layer thermal auxiliary structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a glue feeding mechanism of a PET bottle embryo injection mold. Background Art

[0002] PET preforms are generally molded by injection molding. A heat-assist structure is generally provided at the bottom of the injection tube of the injection molding mechanism in the PET preform mold to ensure the temperature of the injection liquid. However, the heat-assist structures in the prior art are all single-layer structures, and the heat-assist effect is poor.

[0003] For example, a Chinese patent discloses a preform mold structure with a bottle mouth groove [application number: 201310002265.0]. The core locking ring of the preform mold structure is a hollow conical column structure, the inner hollow is a cylindrical hollow, one end of the outer circumference is a conical structure, and the other end is a cylindrical structure. A through hole is provided on the wall at the junction of the conical structure and the cylindrical structure. An annular groove is processed on the inner cylindrical surface of the end of the cylindrical structure of the core locking ring, and a bottle mouth groove is formed at the transition between the annular groove and the step on the outer cylindrical surface of the core; the die lip is composed of two split pieces, one of which is provided with an exhaust groove on the contact surface of the two pieces; the exhaust groove is divided into two branches, one branch is parallel to the axial direction of the die lip, and one end of the exhaust groove is connected to the contact end surface of the core locking ring and the die lip, and the distance from the contact end surface of the die lip is 0.025-1mm. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a glue feeding mechanism for a PET preform injection mould.

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

[0006] A glue feeding mechanism of a PET preform injection mold comprises a mold main body, wherein a plurality of composite cavity components and a diverter injection molding component connected to the plurality of composite cavity components are arranged in the mold main body, wherein the composite cavity component comprises an upper cover plate, an annular insert, an intermediate insert and a lower sealing plate which are sequentially arranged from top to bottom, wherein a molding cavity is arranged between the upper cover plate, the annular insert, the intermediate insert and the lower sealing plate, wherein a glue feeding port which is arranged through the upper and lower parts is arranged in the middle of the upper cover plate, wherein the cross section of the glue feeding port is circular and the diameter of the glue feeding port gradually decreases from top to bottom, and wherein a double-layer hot runner heat-assist structure which is arranged along the circumference of the glue feeding port is arranged on the upper cover plate.

[0007] In the above-mentioned PET preform injection mold glue feeding mechanism, the double-layer hot runner thermal auxiliary structure includes an upper hot auxiliary runner structure and a lower hot auxiliary runner structure arranged on the upper cover plate, the upper hot auxiliary runner structure is arranged on the upper side of the lower hot auxiliary runner structure, and two inlet and outlet channels are symmetrically arranged on the circumferential surface of the upper cover plate, and the upper hot auxiliary runner structure and the lower hot auxiliary runner structure are both connected to the inlet and outlet channels.

[0008] In the above-mentioned PET preform injection mold glue feeding mechanism, the upper layer hot auxiliary runner structure includes three groups of upper X-shaped runners arranged along the circumference of the glue inlet, the two outer ends of the upper X-shaped runners horizontally penetrate the circumferential surface of the upper cover plate and are flush with the circumferential surface of the upper cover plate, the two inner ends of the upper X-shaped runners are respectively connected to the inner ends of the upper X-shaped runners on the adjacent sides, and the six inner ends of the three groups of upper X-shaped runners are connected to form a number one regular hexagonal hot auxiliary runner.

[0009] In the above-mentioned PET preform injection mold glue feeding mechanism, the lower layer hot auxiliary runner structure includes three groups of lower X-shaped runners arranged along the circumference of the glue inlet, the two outer ends of the lower X-shaped runners horizontally penetrate the circumferential surface of the upper cover plate and are flush with the circumferential surface of the upper cover plate, and the two inner ends of the lower X-shaped runners are respectively connected to the inner ends of the lower X-shaped runners on the adjacent sides, and the six inner ends of the three groups of lower X-shaped runners are connected to form a No. 2 regular hexagonal hot auxiliary runner.

[0010] In the above-mentioned glue feeding mechanism of the PET preform injection mold, the first regular hexagonal hot auxiliary runner and the second regular hexagonal hot auxiliary runner are both connected to two inlet and outlet channels.

[0011] In the above-mentioned glue feeding mechanism of the PET preform injection mold, a channel positioning structure is also provided on the circumferential surface of the upper cover plate.

[0012] In the above-mentioned PET preform injection mold glue feeding mechanism, the channel positioning structure includes an arc-shaped limit groove horizontally arranged on the circumferential surface of the upper cover plate, one end of the arc-shaped limit groove is connected to the inlet and outlet channels, and the bottom of the arc-shaped limit groove away from the inlet and outlet channels is provided with a positioning block inlet and outlet vertically penetrating the upper cover plate downward, and a positioning block is arranged in the mold body.

[0013] In the above-mentioned PET preform injection mold glue feeding mechanism, an upper limit positioning structure is also provided on the top of the upper cover plate, and the upper limit positioning structure includes at least two arc-shaped notches recessed inwardly at the edge of the top surface of the upper cover plate and an annular limiting plate inserted into the arc-shaped notches, and the bottom of the annular limiting plate is against the bottom surface of the arc-shaped notch.

[0014] In the above-mentioned PET preform injection mold glue feeding mechanism, a plurality of annular cooling channels are arranged in parallel along the vertical direction on the circumferential surface of the annular insert, and an inclined connecting channel is provided between the annular cooling channel located on the upper side and the annular cooling channel located on the lower side.

[0015] In the above-mentioned PET bottle embryo injection mold glue feeding mechanism, the diversion injection molding component includes an injection liquid diversion plate arranged directly above the composite cavity component, and the bottom of the injection liquid diversion plate is fixedly connected to a plurality of injection molding tubes corresponding to the composite cavity components one by one, and the bottom end of the injection molding tube is inserted into the glue inlet.

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

[0017] 1. The molding cavity in the composite cavity assembly composed of the upper cover plate, the annular insert, the middle insert and the lower sealing plate can be used for injection molding of PET preforms. The diverter injection assembly can divert the injection liquid into the molding cavities in several composite cavity assemblies. The double-layer hot runner thermal auxiliary structure arranged on the upper cover plate can heat the glue inlet after the high-temperature gas is introduced to ensure the temperature of the injection liquid at the glue inlet. The thermal auxiliary effect is better than that of the single-layer thermal auxiliary structure.

[0018] 2. The hot auxiliary gas can be introduced into the upper hot auxiliary runner structure and the lower hot auxiliary runner structure through the inlet and outlet channels, so that the injection liquid at the glue inlet can be double heated.

[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 schematic diagram of the external structure of the utility model;

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

[0022] Figure 3 is a schematic diagram of the structure of the composite cavity assembly;

[0023] Figure 4 It is a schematic diagram of the local structure of the composite cavity assembly;

[0024] Figure 5 It is a cross-sectional view of the upper thermal auxiliary flow channel structure;

[0025] Figure 6 It is a cross-sectional view of the lower thermal auxiliary runner structure.

[0026] In the figure, the mold body 1, the composite cavity component 2, the diverter injection molding component 3, the upper cover plate 4, the annular insert 5, the middle insert 6, the lower sealing plate 7, the molding cavity 8, the glue inlet 9, the upper thermal auxiliary runner structure 10, the lower thermal auxiliary runner structure 11, the inlet and outlet channels 12, the upper X-shaped runner 13, the first regular hexagonal thermal auxiliary runner 14, the lower X-shaped runner 15, the second regular hexagonal thermal auxiliary runner 16, the channel positioning structure 17, the arc-shaped limit groove 18, the positioning card inlet and outlet 19, the arc-shaped notch 20, the annular limit plate 21, the annular cooling runner 22, the connecting channel 23, the injection liquid diverter plate 24, and the injection molding tube 25. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 6 As shown, a glue feeding mechanism of a PET bottle embryo injection mold includes a mold body 1, wherein the mold body 1 is provided with a plurality of composite cavity components 2 and a diverter injection molding component 3 connected to the plurality of composite cavity components 2, wherein the composite cavity component 2 includes an upper cover plate 4, an annular insert 5, an intermediate insert 6 and a lower sealing plate 7 which are sequentially arranged from top to bottom, wherein a molding cavity 8 is arranged between the upper cover plate 4, the annular insert 5, the intermediate insert 6 and the lower sealing plate 7, wherein a glue feeding port 9 which is arranged through the upper and lower parts is arranged in the middle of the upper cover plate 4, wherein the cross section of the glue feeding port 9 is circular and the diameter of the glue feeding port 9 gradually decreases from top to bottom, and wherein a double-layer hot runner thermal auxiliary structure which is arranged circumferentially along the glue feeding port 9 is arranged on the upper cover plate 4.

[0028] In the utility model, the molding cavity in the composite cavity assembly 2 composed of the upper cover plate 4, the annular insert 5, the middle insert 6 and the lower sealing plate 7 can be used for injection molding of PET bottle embryos. The diversion injection molding assembly 3 can divert the injection liquid and inject it into the molding cavities in the several composite cavity assemblies 2. The double-layer hot runner thermal auxiliary structure arranged on the upper cover plate 4 can heat the glue inlet after the hot auxiliary gas is introduced to ensure the temperature of the injection liquid at the glue inlet. The thermal auxiliary effect is better than that of the single-layer thermal auxiliary structure.

[0029] Specifically, the double-layer hot runner thermal auxiliary structure includes an upper layer hot auxiliary runner structure 10 and a lower layer hot auxiliary runner structure 11 arranged on the upper cover plate 4, wherein the upper layer hot auxiliary runner structure 10 is arranged on the upper side of the lower layer hot auxiliary runner structure 11, and two inlet and outlet channels 12 are symmetrically arranged on the circumferential surface of the upper cover plate 4, and the upper layer hot auxiliary runner structure 10 and the lower layer hot auxiliary runner structure 11 are both connected to the inlet and outlet channels 12. The hot auxiliary gas can be introduced into the upper layer hot auxiliary runner structure 10 and the lower layer hot auxiliary runner structure 11 through the inlet and outlet channels 12, so that the injection liquid at the glue inlet can be heated double.

[0030] Specifically, the upper thermal auxiliary runner structure 10 includes three groups of upper X-shaped runners 13 arranged circumferentially along the glue inlet 9, the two outer ends of the upper X-shaped runners 13 horizontally penetrate the circumferential surface of the upper cover plate 4 and are flush with the circumferential surface of the upper cover plate 4, the two inner ends of the upper X-shaped runners 13 are respectively connected to the inner ends of the upper X-shaped runners 13 on the adjacent sides, and the six inner ends of the three groups of upper X-shaped runners 13 are connected to form a regular hexagonal thermal auxiliary runner 14. The thermal auxiliary gas entering from the inlet and outlet channels 12 can enter the regular hexagonal thermal auxiliary runner 14 composed of the three groups of upper X-shaped runners 13, so as to heat the injection molding liquid at the upper side of the upper cover plate.

[0031] Specifically, the lower layer heat auxiliary runner structure 11 includes three groups of lower X-shaped runners 15 arranged circumferentially along the glue inlet 9, the two outer ends of the lower X-shaped runners 15 horizontally penetrate the circumferential surface of the upper cover plate 4 and are flush with the circumferential surface of the upper cover plate 4, the two inner ends of the lower X-shaped runners 15 are respectively connected to the inner ends of the lower X-shaped runners 15 on the adjacent sides, and the six inner ends of the three groups of lower X-shaped runners 15 are connected to form a second regular hexagonal heat auxiliary runner 16. The heat auxiliary gas entering from the inlet and outlet channels 12 can enter the second regular hexagonal heat auxiliary runner composed of the three groups of lower X-shaped runners 15, so as to heat the injection molding liquid at the lower side of the upper cover plate.

[0032] Specifically, the first regular hexagonal hot auxiliary flow channel 14 and the second regular hexagonal hot auxiliary flow channel 16 are both connected to the two inlet and outlet channels 12 .

[0033] Preferably, a channel positioning structure 17 is also provided on the circumferential surface of the upper cover plate 4, and the channel positioning structure 17 includes an arc-shaped limiting groove 18 horizontally arranged on the circumferential surface of the upper cover plate 4, one end of the arc-shaped limiting groove 18 is connected to the inlet and outlet channels 12, and a positioning block inlet and outlet 19 vertically penetrating the upper cover plate 4 is provided at the bottom of the arc-shaped limiting groove 18 away from the inlet and outlet channels 12, and a positioning block is provided in the mold body 1. When the upper cover plate 4 is installed, the positioning block inlet and outlet 19 is aligned with the positioning block in the mold body 1, and the upper cover plate is moved downward so that the positioning block can be inserted into the arc-shaped limiting groove 18, and then the upper cover plate is rotated so that the positioning block is at the inlet and outlet channel 12 at one end of the arc-shaped limiting groove 18, and at this time, the inlet and outlet channel 12 at the other end of the upper cover plate is aligned with the hot auxiliary gas inlet in the mold body, thereby achieving the function of positioning the upper cover plate.

[0034] Preferably, an upper limit structure is also provided at the top of the upper cover plate 4, and the upper limit structure includes at least two arc-shaped notches 20 recessed inwardly and arranged at the edge of the top surface of the upper cover plate 4 and an annular limit plate 21 inserted into the arc-shaped notches 20, and the bottom of the annular limit plate 21 abuts against the bottom surface of the arc-shaped notch 20. After the upper cover plate is installed, the annular limit plate is inserted into the arc-shaped notch and then the annular limit plate 21 is fixed by screws, so that the upper cover plate can be upper-positioned by the annular limit plate.

[0035] Preferably, a plurality of annular cooling channels 22 are arranged in parallel along the vertical direction on the circumferential surface of the annular insert 5, and an inclined connecting channel 23 is provided between the annular cooling channel 22 located on the upper side and the annular cooling channel 22 located on the lower side. The annular cooling channel arranged on the circumferential surface of the annular insert 5 can be used as a flow channel for the coolant so that the product can be water-cooled after injection molding.

[0036] Specifically, the flow-dividing injection molding component 3 includes an injection molding liquid flow-dividing plate 24 disposed directly above the composite cavity component 2, and a plurality of injection molding tubes 25 corresponding to the composite cavity component 2 are fixedly connected to the bottom of the injection molding liquid flow-dividing plate 24, and the bottom ends of the injection molding tubes 25 are inserted into the glue inlet 9. The injection molding liquid flow-dividing plate 24 can divert the injection molding liquid into a plurality of injection molding tubes and then inject the injection molding liquid into the glue inlet located in the middle of the upper cover plate through the injection molding tubes, and the injection molding liquid finally enters the molding cavity through the glue inlet.

[0037] The working principle of the utility model is as follows: the molding cavity in the composite cavity assembly 2 composed of the upper cover plate 4, the annular insert 5, the middle insert 6 and the lower sealing plate 7 can be used for injection molding of PET preforms, the diversion injection molding assembly 3 can divert the injection liquid into the molding cavities in the composite cavity assembly 2, and the double-layer hot runner heat-assisted structure arranged on the upper cover plate 4 can heat the glue inlet after the hot-assisted gas is introduced to ensure the temperature of the injection liquid at the glue inlet, and the heat-assisted effect is better than that of the single-layer heat-assisted structure;

[0038] The hot auxiliary gas can be introduced into the upper hot auxiliary runner structure 10 and the lower hot auxiliary runner structure 11 through the inlet and outlet channels 12, so that the injection molding liquid at the inlet can be heated double. The hot auxiliary gas entering from the inlet and outlet channels 12 can enter the first regular hexagonal hot auxiliary runner 14 composed of three groups of upper X-shaped runners 13, so that the injection molding liquid at the upper side of the upper cover plate can be heated. The hot auxiliary gas entering from the inlet and outlet channels 12 can enter the second regular hexagonal hot auxiliary runner composed of three groups of lower X-shaped runners 15, so that the injection molding liquid at the lower side of the upper cover plate can be heated.

[0039] When installing the upper cover plate 4, align the inlet and outlet 19 of the positioning block with the positioning block in the mold body 1, move the upper cover plate downward so that the positioning block can be inserted into the arc-shaped limit groove 18, and then rotate the upper cover plate so that the positioning block is at the inlet and outlet channel 12 at one end of the arc-shaped limit groove 18. At this time, the inlet and outlet channel 12 at the other end of the upper cover plate is aligned with the hot auxiliary gas inlet in the mold body to achieve the function of positioning the upper cover plate. After the upper cover plate is installed, the annular limit plate is inserted into the arc notch and then the annular limit plate 21 is fixed by screws. The upper cover plate can be upper-positioned by the annular limit plate;

[0040] The annular cooling channel arranged on the circumferential surface of the annular insert 5 can be used as a flow channel for the coolant so that the product can be water-cooled after injection molding. The injection liquid diverter plate 24 can divert the injection liquid into several injection tubes and then inject it into the glue inlet located in the middle of the upper cover plate through the injection tubes. The injection liquid finally enters the molding cavity through the glue inlet.

[0041] 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.

[0042] Although this article uses the mold body 1, composite cavity component 2, diverter injection molding component 3, upper cover plate 4, annular insert 5, middle insert 6, lower sealing plate 7, molding cavity 8, glue inlet 9, upper thermal auxiliary runner structure 10, lower thermal auxiliary runner structure 11, inlet and outlet channels 12, upper X-shaped runner 13, No. 1 regular hexagonal thermal auxiliary runner 14, lower X-shaped runner 15, No. 2 regular hexagonal thermal auxiliary runner 16, channel positioning structure 17, arc-shaped limit groove 18, positioning card inlet and outlet 19, arc-shaped notch 20, annular limit plate 21, annular cooling runner 22, connecting channel 23, injection liquid diverter plate 24, injection molding tube 25, 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. A glue feeding mechanism for a PET preform injection mold, comprising a mold body (1), characterized in that: The mold body (1) is provided with a plurality of composite cavity components (2) and a flow-dividing injection molding component (3) connected to the plurality of composite cavity components (2). The composite cavity component (2) comprises an upper cover plate (4), an annular insert (5), an intermediate insert (6) and a lower sealing plate (7) which are arranged in sequence from top to bottom. A molding cavity (8) is arranged between the upper cover plate (4), the annular insert (5), the intermediate insert (6) and the lower sealing plate (7). A glue inlet (9) is arranged in the middle of the upper cover plate (4) and is arranged to pass through the upper and lower parts. The cross section of the glue inlet (9) is circular and the diameter of the glue inlet (9) gradually decreases from top to bottom. The upper cover plate (4) is provided with a double-layer hot runner thermal auxiliary structure arranged along the circumference of the glue inlet (9).

2. The glue feeding mechanism of the PET preform injection mold according to claim 1, characterized in that: The double-layer hot runner thermal auxiliary structure comprises an upper layer hot auxiliary runner structure (10) and a lower layer hot auxiliary runner structure (11) arranged on an upper cover plate (4); the upper layer hot auxiliary runner structure (10) is arranged on the upper side of the lower layer hot auxiliary runner structure (11); two inlet and outlet channels (12) are symmetrically arranged on the circumferential surface of the upper cover plate (4); the upper layer hot auxiliary runner structure (10) and the lower layer hot auxiliary runner structure (11) are both connected to the inlet and outlet channels (12).

3. The glue feeding mechanism of the PET preform injection mold according to claim 2, characterized in that: The upper thermal auxiliary flow channel structure (10) comprises three groups of upper X-shaped flow channels (13) arranged along the circumference of the glue inlet (9), the two outer ends of the upper X-shaped flow channels (13) horizontally penetrate the circumferential surface of the upper cover plate (4) and are flush with the circumferential surface of the upper cover plate (4), the two inner ends of the upper X-shaped flow channels (13) are respectively connected to the inner ends of the upper X-shaped flow channels (13) on the adjacent sides, and the six inner ends of the three groups of upper X-shaped flow channels (13) are connected to form a number one regular hexagonal thermal auxiliary flow channel (14).

4. The glue feeding mechanism of the PET preform injection mold according to claim 3, characterized in that: The lower layer thermal auxiliary flow channel structure (11) comprises three groups of lower X-shaped flow channels (15) arranged along the circumference of the glue inlet (9), the two outer ends of the lower X-shaped flow channels (15) horizontally penetrate the circumferential surface of the upper cover plate (4) and are flush with the circumferential surface of the upper cover plate (4), the two inner ends of the lower X-shaped flow channels (15) are respectively connected to the inner ends of the lower X-shaped flow channels (15) on the adjacent sides, and the six inner ends of the three groups of lower X-shaped flow channels (15) are connected to form a number two regular hexagonal thermal auxiliary flow channel (16).

5. The glue feeding mechanism of the PET preform injection mold according to claim 4, characterized in that: The first regular hexagonal thermal auxiliary flow channel (14) and the second regular hexagonal thermal auxiliary flow channel (16) are both connected to the two inlet and outlet channels (12).

6. The glue feeding mechanism of the PET preform injection mold according to claim 2, characterized in that: A channel positioning structure (17) is also provided on the circumferential surface of the upper cover plate (4).

7. The glue feeding mechanism of the PET preform injection mold according to claim 6, characterized in that: The channel positioning structure (17) comprises an arc-shaped limiting groove (18) horizontally arranged on the circumferential surface of the upper cover plate (4), one end of the arc-shaped limiting groove (18) is connected to the inlet and outlet channels (12), and a positioning block inlet and outlet (19) vertically penetrating the upper cover plate (4) is arranged at the bottom of the arc-shaped limiting groove (18) away from the inlet and outlet channels (12), and the positioning block is arranged inside the mold body (1).

8. The glue feeding mechanism of the PET preform injection mold according to claim 6, characterized in that: The top of the upper cover plate (4) is also provided with an upper limit structure, the upper limit structure comprising at least two inwardly recessed arc-shaped notches (20) arranged at the edge of the top surface of the upper cover plate (4) and an annular limit plate (21) inserted into the arc-shaped notches (20), the bottom of the annular limit plate (21) abutting against the bottom surface of the arc-shaped notch (20).

9. The glue feeding mechanism of the PET preform injection mold according to claim 1, characterized in that: A plurality of annular cooling channels (22) are arranged in parallel along the vertical direction on the circumferential surface of the annular insert (5), and an inclined connecting channel (23) is provided between the annular cooling channel (22) located on the upper side and the annular cooling channel (22) located on the lower side.

10. The glue feeding mechanism of the PET preform injection mold according to claim 1, characterized in that: The diversion injection molding component (3) includes an injection molding liquid diversion plate (24) arranged directly above the composite cavity component (2), and the bottom of the injection molding liquid diversion plate (24) is fixedly connected to a plurality of injection molding tubes (25) corresponding one to one with the composite cavity component (2), and the bottom end of the injection molding tube (25) is inserted into the glue inlet (9).

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