Float blow molding mold based on air pressure balance principle

Abstract

The utility model provides a kind of based on air pressure balance principle's pontoon blow molding mold, belong to blow molding mold technical field.It includes top die, upper side die, lower side die and bottom die, the top die and bottom die are respectively inwardly recessed and provided with upper forming groove and lower forming groove, the upper side die and lower side die are in square ring and are set between top die and bottom die, the upper forming groove, upper side die, lower side die and lower forming groove combination form forming cavity.By combination formula exhaust structure can realize forming cavity air pressure balance, avoid the hindering sticking mold when when because cavity air pressure residual of parison blow inflation;Anti-overflow glue double-layer sealing structure enhances the sealing property at clamping point, reduces melt overflow;Depth adjustable horizontal reinforcing rib groove forming assembly and vertical reinforcing rib groove forming structure cooperate, can be shaped reinforcing rib as needed, this design effectively solves the flash problem at clamping point, while improving the strength of pontoon structure, adapts different reinforcing rib forming needs.

Description

Technical Field

[0001] This utility model belongs to the field of blow molding technology, and relates to a float blow molding mold based on the principle of air pressure balance. Background Technology

[0002] In the blow molding of pontoons, the sealing effect at the mold closing point and the air pressure balance in the molding cavity are core issues affecting product quality. Traditional pontoon blow molding molds often use a single sealing structure. During mold closing, incomplete sealing can lead to melt overflowing from the mold gap, forming flash defects and increasing the cost of subsequent trimming processes. Simultaneously, an unreasonable venting structure design often results in insufficient air removal from the molding cavity, creating back pressure that hinders the uniform adhesion of the preform to the mold, further affecting the pontoon molding accuracy and surface quality. Therefore, controlling the sealing performance at the mold closing point and the air pressure balance in the molding cavity are key technical challenges. Traditional molds often suffer from a single sealing structure design, leading to melt overflow at the mold closing gap and flash defects. Furthermore, an unreasonable venting structure layout can cause residual air pressure in the molding cavity, creating back pressure that hinders the uniform adhesion of the preform to the mold, affecting not only the pontoon molding quality but also potentially increasing the cost of subsequent trimming processes. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a float blow molding die based on the principle of air pressure balance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A blow molding die for a float based on the principle of air pressure balance includes a top mold, an upper side mold, a lower side mold, and a bottom mold. The top mold and the bottom mold are respectively provided with an upper forming groove and a lower forming groove that are recessed inward. The upper side mold and the lower side mold are rectangular and annular and are located between the top mold and the bottom mold. The upper forming groove, the upper side mold, the lower side mold, and the lower forming groove are combined to form a molding cavity. A blow molding port connected to the molding cavity is provided between the upper side mold and the lower side mold. The upper forming groove and the lower forming groove are provided with a combined venting structure. The connection between the upper side mold and the lower side mold is also provided with a double-layer sealing structure to prevent glue overflow. A depth-adjustable horizontal reinforcing rib groove forming component is also provided between the upper side mold and the top mold. A vertical reinforcing rib groove forming structure is also provided on the side wall of the molding cavity.

[0005] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the anti-overflow glue double-layer sealing structure includes a first sealing strip and a second sealing strip protruding from the upper mold and the lower mold. The first sealing strip is located inside the second sealing strip, and both the first sealing strip and the second sealing strip are arranged circumferentially along the outer edge of the molding cavity.

[0006] In the above-mentioned float blow molding mold based on the principle of air pressure balance, when the mold is closed, the first sealing strips on the upper mold and the lower mold abut against each other, and the second sealing strips on the upper mold and the lower mold abut against each other.

[0007] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the combined venting structure includes an upper venting hole structure set in the upper molding groove and a lower venting hole structure set in the lower molding groove.

[0008] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the upper vent structure includes several upper vents set at the bottom of the upper molding groove. The upper vents penetrate the top mold in a vertical direction, and the several upper vents are connected to form a rectangular ring.

[0009] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the bottom of the lower forming groove is provided with a number of anti-slip forming grooves arranged in a rectangular array, and the lower vent structure is provided in a number of sets corresponding to the anti-slip forming grooves. The lower vent structure includes four lower vents arranged in a rectangular array at the bottom of the anti-slip forming groove. The lower vents penetrate the bottom mold in a vertical direction, and the top of the lower vents also has an arc-shaped anti-slip forming groove.

[0010] In the above-mentioned float blow molding die based on the principle of air pressure balance, the diameter of the lower vent hole is smaller than that of the upper vent hole.

[0011] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the depth-adjustable horizontal reinforcing rib groove forming component includes four movable reinforcing rib groove forming blocks disposed between the top mold and the upper side mold. The four movable reinforcing rib groove forming blocks are respectively slidably disposed on the four sides of the top of the upper side mold, and the inner end of the movable reinforcing rib groove forming block is inserted into the forming cavity.

[0012] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the cross-section of the movable reinforcing rib groove forming block is Z-shaped, the bottom of the top mold is provided with an inner limiting part that can abut against the inner end of the movable reinforcing rib groove forming block, and the top of the upper mold is provided with an outer limiting part that can abut against the outer end of the movable reinforcing rib groove forming block.

[0013] In the above-mentioned float blow molding mold based on the principle of air pressure balance, the vertical reinforcing rib groove forming structure includes several fixed reinforcing rib groove forming blocks that protrude from the inner side wall of the forming cavity and are vertically arranged.

[0014] Compared with existing technologies, the advantages of this utility model are: 1. The combined venting structure can achieve air pressure balance in the molding cavity, avoiding the obstruction of mold adhesion due to residual air pressure in the cavity during the blank inflation; the anti-overflow double-layer sealing structure enhances the sealing performance at the mold closing point and reduces melt overflow; the depth-adjustable horizontal reinforcing rib groove forming component works in conjunction with the vertical reinforcing rib groove forming structure to form reinforcing ribs as needed. This design effectively solves the flash problem at the mold closing point, while improving the strength of the float structure and adapting to different reinforcing rib forming requirements.

[0015] 2. The anti-overflow double-layer sealing structure adopts a double-layer design of an inner first sealing strip and an outer second sealing strip, both of which are set along the circumferential direction of the outer edge of the molding cavity. The double-layer sealing forms a double sealing barrier, which further improves the sealing performance at the mold closing point compared with a single-layer seal, effectively preventing the melt from overflowing into the mold closing gap during blowing, and structurally reducing the possibility of flash generation.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a structural diagram of the upper mold, lower mold, and bottom mold; Figure 3 This is a structural diagram of the lower side mold and the bottom mold; Figure 4 This is a structural diagram of the top mold and the upper side mold; Figure 5 This is a sectional view of the top mold and the upper side mold; Figure 6 yes Figure 4 Enlarged view of point B in the middle; Figure 7 yes Figure 3 Enlarged diagram of point A in the middle. Detailed Implementation

[0018] like Figures 1-7As shown, a float blow molding die based on the principle of air pressure balance includes a top mold 1, an upper side mold 2, a lower side mold 3, and a bottom mold 4. The top mold 1 and the bottom mold 4 are respectively provided with an upper forming groove 5 and a lower forming groove 6 recessed inward. The upper side mold 2 and the lower side mold 3 are rectangular and annular and are located between the top mold 1 and the bottom mold 4. The upper forming groove 5, the upper side mold 2, the lower side mold 3, and the lower forming groove 6 are combined to form a molding cavity 7. A blow molding port 8 connected to the molding cavity 7 is provided between the upper side mold 2 and the lower side mold 3. The upper forming groove 5 and the lower forming groove 6 are provided with a combined venting structure. The connection between the upper side mold 2 and the lower mold 3 is also provided with a double-layer sealing structure 9 to prevent overflow. An adjustable-depth horizontal reinforcing rib groove forming assembly 10 is also provided between the upper side mold 2 and the top mold 1. The side wall of the molding cavity 7 is also provided with a vertical reinforcing rib groove forming structure 11.

[0019] In this invention, the combined venting structure can achieve air pressure balance in the molding cavity, preventing residual air pressure in the cavity from hindering mold adhesion during blank inflation; the anti-overflow double-layer sealing structure enhances the sealing performance at the mold closing point and reduces melt overflow; the depth-adjustable horizontal reinforcing rib groove forming component works in conjunction with the vertical reinforcing rib groove forming structure to form reinforcing ribs as needed. This design effectively solves the flash problem at the mold closing point, while improving the strength of the float structure and adapting to different reinforcing rib forming requirements.

[0020] Specifically, the anti-overflow double-layer sealing structure 9 includes a first sealing strip 12 and a second sealing strip 13 protruding from the upper mold 2 and the lower mold 3. The first sealing strip 12 is located inside the second sealing strip 13, and both the first sealing strip 12 and the second sealing strip 13 are arranged circumferentially along the outer edge of the molding cavity 7. The anti-overflow double-layer sealing structure adopts a double-layer design of an inner first sealing strip and an outer second sealing strip, both of which are arranged circumferentially along the outer edge of the molding cavity. The double-layer sealing forms a double sealing barrier, which further improves the sealing performance at the mold closing point compared to a single-layer seal, effectively preventing the melt from overflowing into the mold closing gap during blowing, and structurally reducing the possibility of flash generation.

[0021] Specifically, during mold closing, the first sealing strip 12 on the upper mold 2 and the lower mold 3 abuts against each other, and the second sealing strip 13 on the upper mold 2 and the lower mold 3 abuts against each other. This double abutment method avoids the generation of sealing gaps, makes the sealing effect more stable, prevents melt overflow caused by incomplete sealing, and further controls the formation of flash.

[0022] Specifically, the combined venting structure includes an upper venting hole structure located in the upper forming groove 5 and a lower venting hole structure located in the lower forming groove 6. The combined venting structure, through the cooperation of the upper venting hole structure in the upper forming groove and the lower venting hole structure in the lower forming groove, achieves comprehensive venting of the upper and lower areas of the forming cavity. This design avoids the venting dead zones that may exist in a single venting structure, ensuring that air in the cavity is quickly discharged during the preform inflation, maintaining air pressure balance, allowing the preform to adhere evenly to the mold, and reducing forming defects caused by air pressure imbalance.

[0023] Specifically, the upper vent structure includes several upper vent holes 14 located at the bottom of the upper forming groove 5. These upper vent holes 14 penetrate the top mold 1 vertically, and are connected in a rectangular annular shape. This annular distribution of vent holes allows for targeted exhaust of air from the top edge area of ​​the forming cavity, preventing back pressure caused by air accumulation and ensuring the forming quality of the float top. Simultaneously, the vertical penetration design ensures a direct and smooth venting path, improving venting efficiency.

[0024] Specifically, the bottom of the lower forming groove 6 is provided with several anti-slip forming grooves 15 arranged in a rectangular array. Several sets of lower venting hole structures are provided and corresponding to the anti-slip forming grooves 15. Each lower venting hole structure includes four lower venting holes 16 arranged in a rectangular array at the bottom of the anti-slip forming grooves 15. The lower venting holes 16 penetrate the bottom mold 4 vertically, and the top of each lower venting hole 16 has an arc-shaped anti-slip forming groove 21. The lower venting hole structure corresponds to the anti-slip forming grooves. The four lower venting holes are arranged in a rectangular array at the bottom of the anti-slip forming grooves and penetrate the bottom mold, with an arc-shaped anti-slip forming groove at the top. This design allows for the simultaneous forming of the float anti-slip structure while venting air from the anti-slip area at the bottom of the forming cavity, preventing incomplete forming due to air accumulation in the anti-slip area, thus balancing the venting function with the product structure forming requirements.

[0025] Specifically, the diameter of the lower vent 16 is smaller than that of the upper vent 14. This difference in diameter ensures that the lower vent can vent the anti-slip area while preventing molten material from seeping into the vent due to an excessively large diameter. Meanwhile, the larger diameter of the upper vent ensures rapid venting in the top area, improving the accuracy of the overall air pressure balance.

[0026] Specifically, the depth-adjustable horizontal reinforcing rib groove forming assembly 10 includes four movable reinforcing rib groove forming blocks 17 disposed between the top mold 1 and the upper side mold 2. The four movable reinforcing rib groove forming blocks 17 are slidably disposed on the four sides of the top of the upper side mold 2, and their inner ends are inserted into the forming cavity 7. The depth-adjustable horizontal reinforcing rib groove forming assembly, with its four movable reinforcing rib groove forming blocks slidably disposed on the top side of the upper mold and their inner ends inserted into the forming cavity, allows the forming depth of the reinforcing rib groove to be adjusted as needed. This eliminates the need to change the mold, adapting to the requirements of different floats for the height of the horizontal reinforcing ribs, thus improving the versatility and flexibility of the mold.

[0027] In practical applications, hydraulic cylinders, linear motors, and other drive mechanisms are installed outside the mold to adjust and support the movable reinforcing rib groove forming block.

[0028] Specifically, the movable reinforcing rib groove forming block 17 has a Z-shaped cross-section. The bottom of the top mold 1 has an inner limiting part 18 that abuts against the inner end of the movable reinforcing rib groove forming block 17, and the top of the upper mold 2 has an outer limiting part 19 that abuts against the outer end of the movable reinforcing rib groove forming block 17. The Z-shaped cross-section of the movable reinforcing rib groove forming block, with the inner limiting part at the bottom of the top mold and the outer limiting part at the top of the upper mold abutting against the inner and outer ends of the forming block respectively, enhances the structural stability of the forming block. The double limiting structure ensures accurate positioning of the forming block during adjustment, avoids deviations in the forming dimensions of the reinforcing rib groove caused by sliding offset, and guarantees the forming accuracy of the horizontal reinforcing ribs of the float.

[0029] Specifically, the vertical reinforcing rib groove forming structure 11 includes several fixed reinforcing rib groove forming blocks 20 protruding vertically from the inner wall of the forming cavity 7. The vertical reinforcing rib groove forming structure, through these several vertically arranged fixed reinforcing rib groove forming blocks protruding from the inner wall of the forming cavity, allows for the simultaneous forming of vertical reinforcing ribs on the side wall of the pontoon, enhancing the overall bending resistance of the pontoon. The vertical arrangement ensures more even stress distribution on the reinforcing ribs, improving the structural strength of the pontoon and meeting the load-bearing requirements of the pontoon during use.

[0030] The working principle of this utility model is as follows: the combined exhaust structure can achieve air pressure balance in the forming cavity, avoiding the obstruction of mold adhesion due to residual air pressure in the cavity when the blank is blown; the anti-overflow double-layer sealing structure enhances the sealing performance at the mold closing point and reduces melt overflow; the depth-adjustable horizontal reinforcing rib groove forming component works in conjunction with the vertical reinforcing rib groove forming structure to form reinforcing ribs as needed. This design effectively solves the flash problem at the mold closing point, while improving the strength of the float structure and adapting to different reinforcing rib forming requirements; The anti-overflow adhesive double-layer sealing structure adopts a double-layer design of an inner first sealing strip and an outer second sealing strip, both of which are set along the circumferential direction of the outer edge of the molding cavity. The double sealing layers form a double sealing barrier, which further improves the sealing performance at the mold closing point compared with a single-layer seal. It effectively prevents the melt from overflowing into the mold closing gap during blowing, and structurally reduces the possibility of flash formation. The double abutment method avoids the formation of sealing gaps, making the sealing effect more stable, preventing melt overflow due to incomplete sealing, and further controlling the formation of flash. The combined venting structure, through the cooperation of the upper venting hole structure of the upper forming groove and the lower venting hole structure of the lower forming groove, achieves comprehensive venting of the upper and lower areas of the forming cavity. This design avoids the venting dead zones that may exist in a single venting structure, ensuring that air in the cavity is quickly discharged during the inflation of the parison, maintaining air pressure balance, and ensuring that the parison adheres evenly to the mold, reducing forming defects caused by air pressure imbalance. The upper venting hole structure adopts several upper venting holes that penetrate the top mold vertically, and these upper venting holes are connected to form a rectangular ring. The rectangular ring distribution of venting holes can target the air in the top edge area of ​​the forming cavity, preventing back pressure caused by air accumulation in this area, ensuring the forming quality of the top of the float, and at the same time, the vertical penetration design makes the venting path direct. Smooth airflow and improved venting efficiency: The lower venting hole structure is set in accordance with the anti-slip part forming groove. The four lower venting holes are rectangularly distributed at the bottom of the anti-slip part forming groove and penetrate the bottom mold. The top has an arc-shaped anti-slip block forming groove. This design can simultaneously form the float anti-slip structure while venting air from the anti-slip part area at the bottom of the forming cavity, avoiding incomplete forming of the anti-slip part due to air accumulation. It takes into account both the venting function and the product structure forming requirements. The diameter of the lower venting hole is smaller than that of the upper venting hole. This difference in diameter ensures that the lower venting hole can vent air from the anti-slip part area while avoiding melt seepage into the venting hole due to excessively large diameter. The larger diameter of the upper venting hole ensures rapid venting from the top area and improves the accuracy of the overall air pressure balance. The depth-adjustable horizontal reinforcing rib groove forming assembly consists of four movable reinforcing rib groove forming blocks that slide on the top side of the upper mold, with their inner ends inserted into the forming cavity. This movable design allows for adjustment of the reinforcing rib groove forming depth as needed, adapting to the horizontal reinforcing rib height requirements of different pontoons without requiring mold replacement. This enhances the mold's versatility and flexibility. The movable reinforcing rib groove forming blocks have a Z-shaped cross-section. The inner limit part at the bottom of the top mold and the outer limit part at the top of the upper mold abut against the inner and outer ends of the forming block, respectively. The Z-shaped cross-section enhances the structural stability of the forming block, and the double-limiting structure ensures precise positioning of the forming block during adjustment, preventing dimensional deviations in the reinforcing rib groove forming caused by sliding offset, and guaranteeing the forming accuracy of the pontoon's horizontal reinforcing ribs. The vertical reinforcing rib groove forming structure consists of several vertically arranged fixed reinforcing rib groove forming blocks protruding from the inner wall of the forming cavity. These fixed forming blocks can simultaneously form vertical reinforcing ribs on the pontoon's side wall, enhancing the overall bending resistance of the pontoon. The vertical arrangement ensures more even stress distribution on the reinforcing ribs, improving the pontoon's structural strength and meeting its load-bearing requirements during use.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A blow molding die for a float based on the principle of air pressure balance, comprising a top die (1), an upper side die (2), a lower side die (3), and a bottom die (4), characterized in that, The top mold (1) and bottom mold (4) are respectively provided with an upper forming groove (5) and a lower forming groove (6) recessed inward. The upper side mold (2) and lower side mold (3) are rectangular rings and are located between the top mold (1) and bottom mold (4). The upper forming groove (5), upper side mold (2), lower side mold (3) and lower forming groove (6) are combined to form a forming cavity (7). A blow molding port (8) connected to the forming cavity (7) is provided between the upper side mold (2) and lower side mold (3). The upper forming groove (5) and lower forming groove (6) are provided with a combined venting structure. A double-layer sealing structure (9) for preventing overflow glue is also provided at the connection between the upper side mold (2) and lower side mold (3). A depth-adjustable horizontal reinforcing rib groove forming component (10) is also provided between the upper side mold (2) and top mold (1). A vertical reinforcing rib groove forming structure (11) is also provided on the side wall of the forming cavity (7).

2. The float blow molding die based on the principle of air pressure balance according to claim 1, characterized in that, The anti-overflow adhesive double-layer sealing structure (9) includes a first sealing strip (12) and a second sealing strip (13) protruding from the upper mold (2) and the lower mold (3). The first sealing strip (12) is located inside the second sealing strip (13). The first sealing strip (12) and the second sealing strip (13) are both arranged circumferentially along the outer edge of the molding cavity (7).

3. The float blow molding die based on the principle of air pressure balance according to claim 2, characterized in that, When the molds are closed, the first sealing strip (12) on the upper mold (2) and the lower mold (3) abuts together, and the second sealing strip (13) on the upper mold (2) and the lower mold (3) abuts together.

4. The float blow molding die based on the principle of air pressure balance according to claim 1, characterized in that, The combined exhaust structure includes an upper exhaust hole structure disposed in the upper forming groove (5) and a lower exhaust hole structure disposed in the lower forming groove (6).

5. The float blow molding die based on the principle of air pressure balance according to claim 4, characterized in that, The upper vent structure includes several upper vents (14) set at the bottom of the upper forming groove (5). The upper vents (14) penetrate the top mold (1) in the vertical direction. Several upper vents (14) are connected to form a rectangular ring.

6. The float blow molding die based on the principle of air pressure balance according to claim 5, characterized in that, The bottom of the lower forming groove (6) is provided with a number of anti-slip forming grooves (15) arranged in a rectangular array. The lower vent structure is provided with a number of sets and is arranged corresponding to the anti-slip forming grooves (15). The lower vent structure includes four lower vents (16) arranged in a rectangular array at the bottom of the anti-slip forming groove (15). The lower vents (16) penetrate the bottom mold (4) in the vertical direction. The top of the lower vents (16) also has an arc-shaped anti-slip forming groove (21).

7. The float blow molding die based on the principle of air pressure balance according to claim 6, characterized in that, The diameter of the lower exhaust port (16) is smaller than that of the upper exhaust port (14).

8. The float blow molding die based on the principle of air pressure balance according to claim 1, characterized in that, The depth-adjustable horizontal reinforcing rib groove forming assembly (10) includes four movable reinforcing rib groove forming blocks (17) disposed between the top mold (1) and the upper side mold (2). The four movable reinforcing rib groove forming blocks (17) are respectively slidably disposed on the four sides of the top of the upper side mold (2), and the inner end of the movable reinforcing rib groove forming block (17) is inserted into the forming cavity (7).

9. The float blow molding die based on the principle of air pressure balance according to claim 8, characterized in that, The cross section of the movable reinforcing rib groove forming block (17) is Z-shaped. The bottom of the top mold (1) is provided with an inner limiting part (18) that can abut against the inner end of the movable reinforcing rib groove forming block (17). The top of the upper mold (2) is provided with an outer limiting part (19) that can abut against the outer end of the movable reinforcing rib groove forming block (17).

10. The float blow molding die based on the principle of air pressure balance according to claim 1, characterized in that, The vertical reinforcing rib groove forming structure (11) includes several fixed reinforcing rib groove forming blocks (20) that protrude from the inner side wall of the forming cavity (7) and are vertically arranged.

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