32-cavity small-gram-weight PET bottle blank injection mold based on balanced hot runner structure

Abstract

The utility model provides a cavity small-gram-weight PET (Polyethylene Terephthalate) bottle blank injection mold based on a balanced hot runner structure, and belongs to the technical field of molds. The bottle blank forming device comprises an upper die plate and a lower die plate, a lifting plate is arranged between the upper die plate and the lower die plate, a plurality of bottle blank forming assemblies are arranged on the upper side of the lifting plate, and a plurality of bottle blank forming assemblies are arranged in each bottle blank forming assembly. The bottle blank forming assembly comprises an upper forming block with an upper die cavity, a lower forming block with a lower die cavity, a core die inserted into the upper die cavity and the lower die cavity from bottom to top, and a separated lip die structure arranged between the upper forming block and the lower forming block. In the bottle blank forming assembly, a forming cavity composed of an upper forming block, a separated lip mold structure, a lower forming block and a core mold can form a bottle blank product in an injection molding mode, and a detachable glue inlet block structure can be detached from the upper forming block so that excess materials can be conveniently removed when the excess materials are left in a glue inlet.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and relates to an injection mold for 32-cavity small-weight PET preforms based on a balanced hot runner structure. Background Art

[0002] Small-weight PET preforms are generally injection molded by molds. After the mold stops for a period of time, the remaining material at the glue inlet of the upper forming block will condense. Although most of the remaining material will be connected to the product, there is still some remaining material left in the glue inlet. Since the diameter of the glue inlet in the prior art is small at the top and large at the bottom, the process of removing the remaining material is very cumbersome.

[0003] For example, a Chinese patent discloses an ultra-precision machining tooling for a multi-cavity preform mold [Application No.: 202320297555.1], which includes a preform injection lower mold and a preform injection upper mold. A multi-cavity preform forming part is arranged in the preform injection upper mold, and a multi-cavity preform hollow part auxiliary forming component is arranged on the preform injection lower mold. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems and provide an injection mold for 32-cavity small-weight PET preforms based on a balanced hot runner structure.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An injection mold for 32-cavity small-weight PET preforms based on a balanced hot runner structure includes an upper template and a lower template. A lifting plate is arranged between the upper template and the lower template. Several groups of preform forming components are arranged on the upper side of the lifting plate. Each group of preform forming components is provided with several preform forming components. The preform forming component includes an upper forming block with an upper mold cavity, a lower forming block with a lower mold cavity, a core mold inserted into the upper mold cavity and the lower mold cavity from bottom to top, and a split lip mold structure arranged between the upper forming block and the lower forming block. The lifting plate is also provided with several lip mold synchronous core-pulling components corresponding to the split lip mold structure. A forming cavity is arranged among the upper forming block, the split lip mold structure, the lower forming block and the core mold. A detachable glue inlet block structure connected to the forming cavity is arranged at the top of the upper forming block.

[0007] In the above injection mold for 32-cavity small-weight PET preforms based on a balanced hot runner structure, each group of preform forming components is provided with eight preform forming components, and the eight preform forming components in the same group are linearly distributed.

[0008] In the above injection mold for 32-cavity small-weight PET preforms based on a balanced hot runner structure, four groups of preform forming components are provided.

[0009] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the detachable gate block structure includes a gate block mounting groove provided at the top of the upper molding block. A gate block is detachably arranged in the gate block mounting groove, and a gate opening penetrating through the upper and lower sides is provided in the gate block.

[0010] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the cross-section of the gate opening is circular and the diameter gradually increases from top to bottom.

[0011] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the cross-section of the gate block is T-shaped and it is fixed to the upper molding block by a plurality of bolts.

[0012] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the split lip mold structure includes two semi-lip molds with semi-circular cross-sections that can form an annular lip mold. An external thread forming groove is provided on the inner circumferential surface of the annular lip mold.

[0013] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the lip mold synchronous core-pulling assembly includes a left translation plate and a right translation plate. The two semi-lip molds forming the annular lip mold are respectively fixed on the left translation plate and the right translation plate. It also includes a left linkage rod and a right linkage rod. The left translation plates in several groups of preform forming assemblies are connected to the left linkage rod by screws, and the right translation plates in several groups of preform forming assemblies are connected to the right linkage rod by screws.

[0014] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, the cross-sections of the left linkage rod and the right linkage rod are inverted T-shaped, and two inverted T-shaped limit sliding grooves are provided on the lifting plate.

[0015] In the above-mentioned 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure, a plurality of annular hot runners are also recessed inward on the circumferential surface of the upper molding block.

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

[0017] 1. The molding cavity composed of the upper molding block, the split lip mold structure, the lower molding block and the core mold in the preform forming assembly can inject and form preform products. The detachable gate block structure can be removed from the upper molding block to facilitate the removal of surplus material when there is surplus material remaining in the gate opening.

[0018] 2. After the product is injection-molded, the lifting plate moves upward to cooperate with the split lip mold structure to push the product upward, separating the product from the core mold. The lip mold synchronous core-pulling assembly can move and separate the split lip mold structure after the lifting plate has risen for a period of time, enabling core-pulling of the lip mold.

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

[0020] Figure 1 is a schematic diagram of the external structure of the present utility model;

[0021] Figure 2 is a partial cross-sectional view of the present utility model;

[0022] Figure 3 is a schematic diagram of the partial structure at the lower template;

[0023] Figure 4 is a cross-sectional view of the upper forming block.

[0024] In the figure, upper template 1, lower template 2, lifting plate 3, preform forming assembly 4, upper forming block 5, lower forming block 6, core mold 7, split lip mold structure 8, lip mold synchronous core-pulling assembly 9, forming cavity 10, detachable glue inlet block structure 11, glue inlet block installation groove 12, glue inlet block 13, glue inlet 14, half lip mold 15, left translation plate 16, right translation plate 17, left linkage rod 18, right linkage rod 19, limit sliding groove 20, hot runner 21. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] As Figures 1-4 shown, a 32-cavity small-weight PET preform injection mold based on a balanced hot runner structure includes an upper template 1 and a lower template 2. A lifting plate 3 is arranged between the upper template 1 and the lower template 2. Several groups of preform forming assemblies 4 are arranged on the upper side of the lifting plate 3. Each group of preform forming assemblies 4 is provided with several preform forming assemblies 4. The preform forming assembly 4 includes an upper forming block 5 with an upper mold cavity, a lower forming block 6 with a lower mold cavity, a core mold 7 inserted into the upper mold cavity and the lower mold cavity from bottom to top, and a split lip mold structure 8 arranged between the upper forming block 5 and the lower forming block 6. The lifting plate 3 is also provided with several lip mold synchronous core-pulling assemblies 9 corresponding to the split lip mold structure 8. A forming cavity 10 is arranged between the upper forming block 5, the split lip mold structure 8, the lower forming block 6, and the core mold 7. A detachable glue inlet block structure 11 connected to the forming cavity 10 is arranged at the top of the upper forming block 5.

[0026] In the present utility model, in the preform forming assembly 4, the forming cavity 10 composed of the upper forming block 5, the split lip die structure 8, the lower forming block 6 and the core die 7 can injection-mold a preform product. The detachable glue inlet block structure 11 can be removed from the upper forming block so as to facilitate the removal of the surplus material when the surplus material remains in the glue inlet.

[0027] After the product is injection-molded, the lifting plate moves upward to cooperate with the split lip die structure 8 to push the product upward to separate the product from the die core. The lip die synchronous core-pulling assembly 9 can move the split lip die structure 8 to separate after the lifting plate rises for a period of time, so as to realize the core-pulling of the lip die.

[0028] Specifically, eight preform forming assemblies 4 are arranged in each group of preform forming assemblies 4, and the eight preform forming assemblies 4 in the same group are arranged in a straight line. There are four groups of preform forming assemblies 4. The four groups of eight preform forming assemblies 4 in each group enable the mold to produce 32 products in one injection molding, with high production efficiency.

[0029] Specifically, the detachable glue inlet block structure 11 includes a glue inlet block installation groove 12 arranged at the top of the upper forming block 5. The glue inlet block 13 is detachably arranged in the glue inlet block installation groove 12. A glue inlet 14 penetrating through the upper and lower sides is arranged in the glue inlet block 13. The cross section of the glue inlet 14 is circular and the diameter gradually increases from top to bottom. The glue inlet block 13 detachably arranged in the glue inlet block installation groove 12 can be conveniently disassembled for removing the surplus material when there is surplus material left in the glue inlet.

[0030] Specifically, the cross section of the glue inlet block 13 is T-shaped and is fixed on the upper forming block 5 by a plurality of bolts.

[0031] Specifically, the split lip die structure 8 includes two semi-lip dies 15 with a semi-circular cross section that can form an annular lip die. An external thread forming groove is arranged on the inner circumferential surface of the annular lip die. After the product is injection-molded, under the action of the lip die synchronous core-pulling assembly 9, the two semi-lip dies forming the annular lip die can perform translational core-pulling, so as to separate the semi-lip die from the external thread formed by the external thread forming groove on the product.

[0032] Specifically, the lip die synchronous core-pulling assembly 9 includes a left translation plate 16 and a right translation plate 17. The two semi-lip dies 15 forming the annular lip die are respectively fixed on the left translation plate 16 and the right translation plate 17. It also includes a left linkage rod 18 and a right linkage rod 19. The left translation plates 16 in several groups of preform forming assemblies 4 are connected to the left linkage rod 18 by screws, and the right translation plates 17 in several groups of preform forming assemblies 4 are connected to the right linkage rod 19 by screws. When the lifting plate moves upward, under the action of the guiding structure or the driving mechanism, the left linkage rod 18 and the right linkage rod 19 can move left and right respectively, so as to drive the semi-lip dies in several preform forming assemblies 4 to separate from the product.

[0033] Preferably, the cross-sections of the left linkage rod 18 and the right linkage rod 19 are inverted T-shaped, and two limiting sliding grooves 20 with inverted T-shaped cross-sections are arranged on the lifting plate 3. The limiting sliding grooves can limit the left linkage rod 18 and the right linkage rod 19.

[0034] Preferably, a plurality of annular hot runners 21 are recessed inward on the circumferential surface of the upper forming block 5. The hot runners can introduce high-temperature gas during the injection molding of the mold so as to maintain the temperature of the injection liquid in the forming cavity.

[0035] The working principle of the present utility model is as follows: In the preform forming assembly 4, the forming cavity 10 composed of the upper forming block 5, the split lip mold structure 8, the lower forming block 6 and the core mold 7 can inject and form preform products. The detachable glue inlet block structure 11 can be removed from the upper forming block to facilitate the removal of the remaining material when there is remaining material in the glue inlet. After the product is injection molded, the lifting plate moves upward to cooperate with the split lip mold structure 8 to push the product upward to separate the product from the mold core. The lip mold synchronous core pulling assembly 9 can move and separate the split lip mold structure 8 after the lifting plate has risen for a period of time, so as to realize the core pulling of the lip mold;

[0036] Four groups of eight preform forming assemblies 4 each enable the mold to produce 32 products in one injection molding, with high production efficiency;

[0037] The glue inlet block 13 detachably arranged in the glue inlet block installation groove 12 can be conveniently disassembled for the removal of the remaining material when there is remaining material in the glue inlet. After the product is injection molded, under the action of the lip mold synchronous core pulling assembly 9, the two half lip molds forming the annular lip mold can perform translational core pulling so as to separate the half lip mold from the external thread formed by the external thread forming groove on the product. When the lifting plate moves upward, under the action of the guiding structure or the driving mechanism, the left linkage rod 18 and the right linkage rod 19 can move left and right respectively, so as to drive the half lip molds in a plurality of preform forming assemblies 4 to separate from the product. The limiting sliding grooves can limit the left linkage rod 18 and the right linkage rod 19, and the hot runners can introduce high-temperature gas during the injection molding of the mold so as to maintain the temperature of the injection liquid in the forming cavity.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0039] Although the upper template 1, lower template 2, lifting plate 3, preform forming assembly 4, upper forming block 5, lower forming block 6, core mold 7, split lip mold structure 8, lip mold synchronous core-pulling assembly 9, forming cavity 10, detachable glue inlet block structure 11, glue inlet block installation groove 12, glue inlet block 13, glue inlet 14, half lip mold 15, left translation plate 16, right translation plate 17, left linkage rod 18, right linkage rod 19, limit sliding groove 20, hot runner 21, etc. are used more frequently in this text, the use of these terms is only for more convenient description and explanation of the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A 32-cavity small-weight PET preform injection mold based on a balanced hot runner structure, comprising an upper template (1) and a lower template (2), characterized in that, A lifting plate (3) is arranged between the upper template (1) and the lower template (2). A number of groups of preform forming assemblies (4) are arranged on the upper side of the lifting plate (3). Each group of preform forming assemblies (4) contains a number of preform forming assemblies (4). The preform forming assembly (4) includes an upper forming block (5) with an upper mold cavity, a lower forming block (6) with a lower mold cavity, a core mold (7) inserted into the upper mold cavity and the lower mold cavity from bottom to top, and a split lip mold structure (8) arranged between the upper forming block (5) and the lower forming block (6). A number of lip mold synchronous core-pulling assemblies (9) corresponding to the split lip mold structure (8) are also arranged on the lifting plate (3). A forming cavity (10) is arranged among the upper forming block (5), the split lip mold structure (8), the lower forming block (6) and the core mold (7). A detachable glue inlet block structure (11) connected to the forming cavity (10) is arranged at the top of the upper forming block (5).

2. The 32-cavity small-weight PET preform injection mold based on the balanced hot runner structure according to claim 1, characterized in that, Each group of preform forming assemblies (4) contains eight preform forming assemblies (4), and the eight preform forming assemblies (4) in the same group are arranged in a straight line.

3. The 32-cavity small-weight PET preform injection mold based on the balanced hot runner structure according to claim 2, characterized in that, There are four groups of the preform forming assemblies (4).

4. The 32-cavity small-gram PET preform injection mold based on a balanced hot runner structure according to claim 1, characterized in that, The detachable glue inlet block structure (11) includes a glue inlet block installation groove (12) arranged at the top of the upper forming block (5). A glue inlet block (13) is detachably arranged in the glue inlet block installation groove (12). A glue inlet (14) penetrating through the upper and lower sides is arranged in the glue inlet block (13).

5. The 32-cavity small-gram PET preform injection mold based on the balanced hot runner structure according to claim 4, wherein, The cross-section of the glue inlet (14) is circular and the diameter gradually increases from top to bottom.

6. The 32-cavity small-weight PET preform injection mold based on the balanced hot runner structure according to claim 4, wherein, The cross-section of the glue inlet block (13) is T-shaped and it is fixed on the upper forming block (5) by a number of bolts.

7. The 32-cavity small-weight PET preform injection mold based on the balanced hot runner structure according to claim 1, characterized in that, The split lip mold structure (8) includes two semi-lip molds (15) with semi-circular cross-sections that can form an annular lip mold. An external thread forming groove is arranged on the inner circumferential surface of the annular lip mold.

8. The 32-cavity small-weight PET preform injection mold based on the balanced hot runner structure according to claim 7, wherein, The lip mold synchronous core-pulling assembly (9) includes a left translation plate (16) and a right translation plate (17). The two semi-lip molds (15) forming the annular lip mold are respectively fixed on the left translation plate (16) and the right translation plate (17). It also includes a left linkage rod (18) and a right linkage rod (19). The left translation plates (16) in a number of groups of preform forming assemblies (4) are connected to the left linkage rod (18) by screws, and the right translation plates (17) in a number of groups of preform forming assemblies (4) are connected to the right linkage rod (19) by screws.

9. The 32-cavity small-weight PET preform injection mold based on a balanced hot runner structure according to claim 8, characterized in that, The cross-sections of the left linkage rod (18) and the right linkage rod (19) are inverted T-shaped, and two inverted T-shaped limit sliding grooves (20) are arranged on the lifting plate (3).

10. The 32-cavity small-gram PET preform injection mold based on the balanced hot runner structure according to claim 1, wherein, A number of annular hot runners (21) are also recessed inward on the circumferential surface of the upper forming block (5).

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