In-mold ejection mechanism for plastic storage box injection mold

Abstract

This utility model provides an in-mold air-ejection demolding mechanism for a plastic storage box injection mold, belonging to the field of mold technology. It includes an upper mold plate, a middle mold plate, and a lower mold plate. A core mold base is provided on the lower mold plate, and a core mold is detachably mounted on the core mold base. The upper mold plate, middle mold plate, core mold, and lower mold plate combine to form the storage box molding cavity. By combining an X-shaped multi-point injection mechanism with an air-ejection demolding mechanism that corresponds to the forming groove of the support foot mounting part on the top of the core mold within the storage box molding cavity formed by the upper mold plate, middle mold plate, core mold, and lower mold plate, the traditional bottom ejection method is changed. The X-shaped multi-point injection ensures that the melt fills the cavity evenly during injection, reducing the risk of adhesion caused by uneven filling. The air-ejection demolding mechanism exerts force from the support foot part, avoiding direct pushing force on the product body, effectively solving the problem of damage caused by excessive adhesion between the product and the core mold.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an in-mold air ejection mechanism for injection molds of plastic storage boxes. Background Technology

[0002] In the injection molding process of plastic storage boxes, the demolding process is a key step to ensure product quality and production efficiency. Traditional plastic storage box injection molds generally adopt a mechanical hard-ejection design for the ejection mechanism. The ejection components (such as ejector pins and ejector plates) are fixed at the bottom of the core mold. During demolding, the ejection components need to be driven by a cylinder or hydraulic cylinder to exert upward force and directly push the molded storage box away from the surface of the core mold. However, this type of traditional ejection mechanism has significant technical defects: On the one hand, after the storage box is formed, it has a close physical contact with the inner wall of the core mold. Especially when the box wall is thick, the cavity structure is complex, or the melt cools and shrinks unevenly, strong adhesion is easily formed between the product and the core mold. The force exerted by the bottom mechanical hard ejection is concentrated in a local area at the bottom of the product, which easily leads to uneven distribution of the ejection force. This can cause minor cosmetic defects such as top marks and dents on the bottom and side walls of the storage box, or even structural damage such as cracking of the box wall and breakage of the corners, significantly increasing the product defect rate and increasing raw material consumption and rework costs. On the other hand, in order to reduce the risk of adhesion, traditional processes often require applying a release agent to the surface of the core mold. This not only increases the operation process and consumable costs, but the residue of the release agent may also affect the surface cleanliness of the product, making it difficult to meet the production standards of high-end storage boxes such as food-grade and medical-grade. In addition, if the product is too tightly adhered to the core mold, it may also cause the ejection mechanism to operate under overload, causing equipment damage such as ejector pin bending and driver failure, forcing the production line to stop for maintenance, which seriously restricts production efficiency.

[0003] For example, a Chinese patent discloses an injection mold for a plastic storage box [application number: 202422286127.6], including a lower mold and an upper mold for forming the storage box. In this invention, during the injection molding process, the molten material is diverted through an injection manifold and enters the cavity. The retractable oblique ejector assembly fits tightly with the outer slider to form the handle slots on both sides of the storage box, eliminating the need for secondary processing. After injection molding, the mold is opened. At this time, the retractable oblique ejector assembly retracts towards the protruding side of the middle section of the molding process, and the outer slider moves outward, separating the retractable oblique ejector assembly and the outer slider from the handle slots formed on both sides of the storage box. Then, the ejector connector moves the spliced ​​extended section molding boss upward, ejecting the molded plastic part. This structure ensures that the handle slots formed on both sides of the storage box are not damaged, and also provides a smooth ejection process with a compact and reasonable structure. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing an in-mold air ejection mechanism for injection molds of plastic storage boxes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An in-mold air-ejection demolding mechanism for a plastic storage box injection mold includes an upper template, a middle template, and a lower template. A core mold base is provided on the lower template, and a core mold is detachably mounted on the core mold base. The upper template, middle template, core mold, and lower template are combined to form a storage box molding cavity. An X-shaped multi-point injection mechanism connected to the storage box molding cavity is provided on the upper side of the upper template. Four rectangular support foot mounting grooves are recessed inward on the top of the core mold. Four combined support foot molding structures corresponding to the support foot mounting grooves are provided on the upper template. Four air-ejection demolding mechanisms corresponding to the support foot mounting grooves are also provided in the lower template and the core mold.

[0006] In the above-mentioned air ejector demolding mechanism of the injection mold for plastic storage boxes, the air ejector demolding mechanism includes a vertical air ejector channel that is located at the bottom of the forming groove of the support foot mounting part and vertically penetrates the core mold, and an air inlet channel that is located in the lower template and connected to the bottom of the vertical air ejector channel.

[0007] In the above-mentioned air ejector demolding mechanism of the injection mold for plastic storage boxes, the top of the vertical air ejector channel has a valve mounting groove, and a valve is provided in the valve mounting groove.

[0008] In the above-mentioned in-mold air ejection mechanism for injection molds of plastic storage boxes, the forming groove of the support foot mounting part is arc-shaped, and the combined support foot forming structure includes an arc-shaped mounting part forming block protruding from the bottom of the upper template and adapted to the forming groove of the support foot mounting part. The arc-shaped mounting part forming block has a rectangular insert mounting groove. The upper template is embedded with a support foot forming block that penetrates the upper template vertically and is inserted into the insert mounting groove at the bottom. The cross-section of the support foot forming block is rectangular, and a rectangular support foot forming groove is formed between the circumferential sidewall of the support foot forming block and the inner sidewall of the insert mounting groove.

[0009] In the above-mentioned air-cushion ejection mechanism of the injection mold for plastic storage boxes, the supporting foot forming block is slidably mounted on the upper template, and the top of the upper template is provided with a forming block fixing plate. The top of the supporting foot forming block is detachably fixed to the forming block fixing plate by several bolts.

[0010] In the above-mentioned in-mold air ejection demolding mechanism of the plastic storage box injection mold, the X-type multi-point injection mechanism includes an X-type injection plate set on the upper side of the upper template. Five injection tubes are fixedly connected to the bottom of the X-type injection plate, and the five injection tubes are respectively set on the middle part of the X-type injection plate and on the four support arms.

[0011] In the above-mentioned in-mold air ejection demolding mechanism of the plastic storage box injection mold, the bottom outer edge of the core mold base is recessed inward and an outer edge forming groove is provided. The bottom of the intermediate template is also provided with two cover connecting plate forming blocks connected to one side wall of the storage box forming cavity. The bottom of the cover connecting plate forming block is inserted into the outer edge forming groove, and two connecting plate forming grooves are provided on the cover connecting plate forming block.

[0012] In the above-mentioned in-mold air ejection demolding mechanism of the plastic storage box injection mold, the cover connecting plate forming block is detachably fixed to the intermediate template by a number of screws.

[0013] In the above-mentioned air ejection demolding mechanism of the injection mold for plastic storage boxes, the top of the intermediate template is also provided with an annular coolant connection channel, and the bottom of the coolant connection channel is provided with several external cooling channels evenly distributed along the circumference of the molding cavity of the storage box.

[0014] In the aforementioned air ejection mechanism for the injection mold of the plastic storage box, the core mold is also provided with several internal cooling channels.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. By combining the upper mold, middle mold, core mold and lower mold to form the storage box molding cavity, and using an X-shaped multi-point injection mechanism and an air ejector mechanism with the corresponding support foot mounting groove on the top of the core mold, the traditional bottom ejection method is changed. The X-shaped multi-point injection ensures that the melt fills the cavity evenly during injection, reducing the risk of adhesion caused by uneven filling; the air ejector mechanism exerts force from the support foot, avoiding direct pushing force on the product body, effectively solving the problem of damage caused by the product sticking too tightly to the core mold. At the same time, the detachable design of the core mold facilitates subsequent maintenance and replacement, improving mold adaptability.

[0016] 2. The air-ejection demolding mechanism adopts a structure that combines a vertical air-ejector channel and an inlet air channel. The vertical air-ejector channel runs vertically through the core mold and connects to the forming groove of the support foot mounting part. The inlet air channel supplies air from the lower mold plate. This design allows high-pressure gas to act precisely on the product's support foot area, forming a uniform pushing force through gas pressure. This replaces traditional mechanical hard ejection and avoids excessive localized force that could lead to product breakage. The airflow can form an air film between the product and the core mold, reducing contact friction and further reducing the risk of adhesion. This solves the product damage problem caused by hard contact in traditional ejection mechanisms and improves demolding stability.

[0017] 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

[0018] Figure 1 This is a diagram of the internal structure of this utility model; Figure 2 This is a structural schematic diagram of the X-type multi-point glue injection mechanism; Figure 3 This is a partial sectional view of the molded structure of the combined support leg; Figure 4 This is a structural diagram of the intermediate template. Figure 5 This is a structural diagram of the upper template; Figure 6 This is a structural diagram showing the process of removing the product from the intermediate template; Figure 7 This is a structural diagram of the lower template when the product has not yet ejected; Figure 8 This is a structural diagram of the lower template after the core mold is hidden; Figure 9 This is a structural schematic diagram of the cover connecting plate molding block. Detailed Implementation

[0019] like Figures 1-9 As shown, an in-mold air-pump demolding mechanism for a plastic storage box injection mold includes an upper template 1, an intermediate template 2, and a lower template 3. A core mold base 4 is provided on the lower template 3, and a core mold 5 is detachably provided on the core mold base 4. The upper template 1, intermediate template 2, core mold 5, and lower template 3 are combined to form a storage box molding cavity 6. An X-shaped multi-point glue injection mechanism 7 connected to the storage box molding cavity 6 is provided on the upper side of the upper template 1. The top of the core mold 5 is recessed inward and provided with four rectangularly distributed support foot mounting grooves 8. The upper template 1 is provided with four combined support foot forming structures 9 corresponding to the support foot mounting grooves 8. The lower template 3 and the core mold 5 are also provided with four air-pump demolding mechanisms 10 corresponding to the support foot mounting grooves 8.

[0020] In this invention, an X-shaped multi-point injection mechanism and an air-ejector demolding mechanism with a corresponding support foot mounting groove on the top of the core mold are combined within the molding cavity of the storage box formed by the upper mold, middle mold, core mold, and lower mold. This changes the traditional bottom ejection method. The X-shaped multi-point injection ensures that the melt fills the cavity evenly during injection molding, reducing the risk of adhesion caused by uneven filling. The air-ejector demolding mechanism exerts force from the support foot, avoiding direct pushing force on the product body, effectively solving the problem of damage caused by excessive adhesion between the product and the core mold. At the same time, the detachable design of the core mold facilitates subsequent maintenance and replacement, improving mold adaptability.

[0021] Specifically, the air-ejection demolding mechanism 10 includes a vertical air-ejection channel 11 located at the bottom of the forming groove 8 of the support foot mounting part and vertically penetrating the core mold 5, and an air inlet channel 12 located inside the lower mold plate 3 and connected to the bottom of the vertical air-ejection channel 11. The air-ejection demolding mechanism adopts a structure where the vertical air-ejection channel and the air inlet channel cooperate. The vertical air-ejection channel vertically penetrates the core mold and connects to the forming groove of the support foot mounting part, while the air inlet channel supplies air from the lower mold plate. This design allows high-pressure gas to act precisely on the product's support foot area, forming a uniform pushing force through gas pressure, replacing traditional mechanical hard ejection and avoiding product damage caused by excessive localized force. The airflow can form an air film between the product and the core mold, reducing contact friction and further reducing the risk of adhesion, solving the product damage problem caused by hard contact in traditional ejection mechanisms, and improving demolding stability.

[0022] Specifically, the top of the vertical air ejector channel 11 has a valve mounting groove 13, within which a valve is installed. The valve in the mounting groove at the top of the vertical air ejector channel allows for precise on / off control of the air ejector channel. During the injection molding stage, the valve closes the channel to prevent melt from entering and causing blockages; during the demolding stage, the valve opens to ensure stable airflow output and prevent insufficient ejection force due to airflow leakage. This design solves the problems of easy material leakage and unstable airflow in traditional air ejector mechanisms, ensuring the accuracy and reliability of the air ejector demolding action, further reducing the risk of product demolding damage due to abnormal airflow, and facilitating channel cleaning and maintenance.

[0023] Specifically, the support foot mounting groove 8 is arc-shaped. The combined support foot forming structure 9 includes an arc-shaped mounting block 14 protruding from the bottom of the upper template 1 and adapted to the support foot mounting groove 8. The arc-shaped mounting block 14 has a rectangular insert mounting groove. A support foot forming block 15 is embedded in the upper template 1, vertically penetrating the upper template 1 and inserted into the insert mounting groove at its bottom. The support foot forming block 15 has a rectangular cross-section, and a rectangular support foot forming groove 16 is formed between the circumferential sidewall of the support foot forming block 15 and the inner sidewall of the insert mounting groove. The arc-shaped support foot mounting groove, combined with the rectangular support foot forming groove, precisely adapts to the forming requirements of the support foot through the cooperation of the arc-shaped mounting block and the rectangular support foot forming groove. The arc-shaped design makes the forming of the product support foot part smoother and reduces stress concentration; the rectangular support foot forming groove ensures the integrity and dimensional accuracy of the support foot structure, avoiding insufficient product strength or uneven force during demolding due to defects in the forming structure. This design solves the problems of irregular molding and easy breakage during demolding of traditional support feet, while improving the connection stability between the support feet and the product body, indirectly reducing the probability of overall product demolding damage.

[0024] Specifically, the support foot forming block 15 is slidably mounted on the upper template 1. A forming block fixing plate 17 is provided on the top of the upper template 1, and the top of the support foot forming block 15 is detachably fixed to the forming block fixing plate 17 by several bolts. The support foot forming block is slidably mounted on the upper template and is detachably fixed by the forming block fixing plate and bolts. The position and size of the support foot forming block can be flexibly adjusted according to the forming requirements of different specifications of storage box support feet. There is no need to replace the entire upper template; only the forming block needs to be replaced or adjusted to adapt to various products, improving the mold's versatility. The sliding design facilitates the installation and calibration of the forming block, and the bolt fixing ensures the stability of the forming block's position during the forming process, avoiding support foot forming deviations caused by forming block offset. This design solves the problems of poor adaptability and high cost of replacing forming components in traditional molds, while ensuring product forming accuracy and indirectly reducing demolding difficulties and product damage caused by forming deviations.

[0025] Specifically, the X-shaped multi-point injection mechanism 7 includes an X-shaped injection plate 18 disposed on the upper side of the upper mold plate 1. Five injection tubes 19 are fixedly connected to the bottom of the X-shaped injection plate 18, and are respectively disposed in the middle and on four support arms of the X-shaped injection plate 18. The X-shaped multi-point injection mechanism, through the X-shaped injection plate and the five injection tubes distributed in the middle and support arms, enables the melt to be uniformly injected into the mold cavity of the receiving box from multiple points. The X-shaped layout covers a wide area of ​​the cavity, and the multi-point injection shortens the melt flow path, reducing temperature differences and pressure losses within the cavity, and avoiding problems such as local density differences, shrinkage marks, or adhesion caused by uneven filling. The five injection tubes act on key areas of the cavity, ensuring that the melt quickly and uniformly fills the cavity, improving product molding quality; at the same time, it reduces excessive extrusion and adhesion between the product and the core mold due to excessive filling pressure, creating favorable conditions for subsequent air ejection demolding and reducing the risk of demolding damage.

[0026] Specifically, the bottom outer edge of the core mold base 4 is recessed inward and has an outer edge forming groove 20. The bottom of the intermediate template 2 also has two cover connecting plate forming blocks 21 connected to one side wall of the storage box forming cavity 6. The bottom of the cover connecting plate forming blocks 21 is inserted into the outer edge forming groove 20, and the cover connecting plate forming blocks 21 have two connecting plate forming grooves 22. The outer edge forming groove at the bottom of the core mold base cooperates with the cover connecting plate forming blocks at the bottom of the intermediate template, and the forming blocks have two connecting plate forming grooves, allowing for the simultaneous forming of the storage box's outer edge and the cover connecting plate structure. The outer edge forming groove ensures accurate dimensions and smooth edges of the storage box's outer edge, avoiding demolding jamming caused by irregular outer edge forming. The cover connecting plate forming groove allows the connecting plate to be formed in one step, eliminating the need for subsequent processing and improving production efficiency. Simultaneously, the structure of the forming blocks inserting into the outer edge forming groove enhances the sealing of the mold cavity during injection molding, reducing melt leakage, ensuring product integrity, indirectly reducing demolding damage caused by product defects, and improving the overall structural stability of the product.

[0027] Specifically, the lid connecting plate molding block 21 is detachably fixed to the intermediate template 2 by several screws. This screw-based fixation allows for quick replacement of the molding block to meet the molding requirements of different sized storage box lid connecting plates. No overall modification of the intermediate template is required, reducing mold adjustment costs and time. The screw fixing method ensures the molding block's stability during injection molding, preventing molding deviations caused by loosening. This design solves the problems of traditional non-removable molding blocks and poor adaptability, improving the mold's compatibility with different products while ensuring the molding accuracy of the connecting plate, reducing demolding difficulties caused by molding deviations, and further reducing the probability of product damage.

[0028] Specifically, the top of the intermediate template 2 is recessed inward and has an annular coolant connection channel 23. At the bottom of the coolant connection channel 23 are several external cooling channels 24 evenly distributed circumferentially along the cavity of the receiving box 6. The annular coolant connection channel at the top of the intermediate template, in conjunction with the external cooling channels distributed circumferentially along the cavity at the bottom, provides uniform cooling to the outer wall of the cavity. The annular channel ensures uniform coolant distribution, while the external cooling channels, arranged circumferentially, ensure consistent temperature across all areas of the cavity, preventing uneven product shrinkage, excessive internal stress, or increased adhesion to the core mold due to excessively rapid or slow local cooling. Uniform cooling improves product molding quality, reduces product deformation or insufficient strength caused by cooling defects, and also reduces adhesion between the product and the core mold, facilitating subsequent air ejection demolding, reducing the risk of demolding damage, shortening the cooling cycle, and improving production efficiency.

[0029] Specifically, the core mold 5 also includes several internal cooling channels 25. These internal cooling channels, in conjunction with the external cooling channels of the intermediate mold plate, form a dual cooling system, enabling simultaneous and uniform cooling of both the inner and outer surfaces of the storage box product. The internal cooling channels act directly on the inner wall of the product, accelerating the cooling of the core area and preventing warping, deformation, or excessive adhesion to the core mold due to differences in cooling rates between the inner and outer surfaces. This dual cooling system further improves cooling efficiency, shortens the molding cycle, and ensures uniform overall product temperature, reducing internal stress and enhancing dimensional stability and structural strength. This design solves the problems of uneven cooling and product adhesion caused by traditional single external cooling, further reducing the probability of product damage during demolding and ensuring consistent product quality.

[0030] The working principle of this utility model is as follows: Within the molding cavity of the storage box formed by the combination of the upper mold, middle mold, core mold, and lower mold, an X-shaped multi-point injection mechanism and an air-ejector demolding mechanism with a corresponding support foot mounting groove on the top of the core mold are used. This changes the traditional bottom ejection method. The X-shaped multi-point injection ensures that the melt fills the cavity evenly during injection molding, reducing the risk of adhesion caused by uneven filling. The air-ejector demolding mechanism applies force from the support foot, avoiding direct pushing force on the product body, effectively solving the problem of damage caused by excessive adhesion between the product and the core mold. Simultaneously, the detachable core mold design facilitates subsequent maintenance and replacement, improving mold adaptability. The air ejector demolding mechanism adopts a structure that combines a vertical air ejector channel with an air inlet channel. The vertical air ejector channel runs vertically through the core mold and connects to the forming groove of the support foot mounting part. The air inlet channel supplies air to it from the lower template. A valve is installed in the valve mounting groove at the top of the vertical air ejector channel, which can realize precise on / off control of the air ejector channel. The support foot mounting section molding groove is designed with an arc surface. The combined support foot molding structure uses the arc surface mounting section molding block to cooperate with the rectangular support foot molding groove, precisely adapting to the molding requirements of the support foot. The support foot molding block is slidably set on the upper template and is detachably fixed by the molding block fixing plate and bolts. The position and size of the support foot molding block can be flexibly adjusted according to the molding requirements of different specifications of storage box support feet. There is no need to replace the entire upper template. Only the molding block needs to be replaced or adjusted to adapt to various products, improving the versatility of the mold. The sliding design facilitates the installation and calibration of the molding block, and the bolt fixing ensures the stability of the molding block position during the molding process, avoiding support foot molding deviation caused by molding block offset. This design solves the problems of poor adaptability and high cost of replacing molding parts in traditional molds, while ensuring product molding accuracy and indirectly reducing demolding difficulties and product damage caused by molding deviation. The X-shaped multi-point injection mechanism uses an X-shaped injection plate and five injection tubes distributed in the middle and support arms to evenly inject the melt into the molded cavity of the storage box from multiple points. The X-shaped layout covers a wide range of the cavity, and the multi-point injection shortens the melt flow path, reduces temperature differences and pressure loss of the melt in the cavity, and avoids problems such as local density differences, shrinkage marks or adhesion caused by uneven filling. The molding groove on the bottom outer edge of the core mold base cooperates with the molded block of the cover connecting plate at the bottom of the middle template, and the molding block has two molding grooves on the connecting plate, which can simultaneously mold the outer edge of the storage box and the structure of the cover connecting plate. The molded block of the cover connecting plate is detachably fixed to the middle template with screws, which facilitates quick replacement of the molding block according to the molding requirements of the cover connecting plate of different specifications of storage boxes. The annular coolant channel at the top of the intermediate template works in conjunction with the external coolant channels distributed circumferentially along the bottom of the cavity to uniformly cool the outer wall of the storage box's molding cavity. The annular channel ensures uniform coolant distribution, while the external coolant channels, positioned circumferentially, maintain consistent temperature across the cavity, preventing uneven product shrinkage, excessive internal stress, or increased adhesion to the core mold due to localized excessively rapid or slow cooling. Several internal coolant channels within the core mold, working in conjunction with the external coolant channels of the intermediate template, form a dual cooling system, simultaneously and uniformly cooling both the inner and outer surfaces of the storage box. The internal coolant channels act directly on the inner wall of the product, accelerating cooling of the core area and preventing warping, deformation, or excessive adhesion to the core mold caused by differences in cooling rates between the inner and outer surfaces.

[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. An in-mold air-pump demolding mechanism for a plastic storage box injection mold, comprising an upper template (1), a middle template (2), and a lower template (3), characterized in that, The lower template (3) is provided with a core mold base (4), and the core mold (5) is detachably provided on the core mold base (4). The upper template (1), the middle template (2), the core mold (5) and the lower template (3) are combined to form a storage box molding cavity (6). The upper side of the upper template (1) is provided with an X-shaped multi-point glue injection mechanism (7) connected to the storage box molding cavity (6). The top of the core mold (5) is recessed inward and provided with four rectangular support foot mounting part molding grooves (8). The upper template (1) is provided with four combined support foot molding structures (9) corresponding to the support foot mounting part molding grooves (8). The lower template (3) and the core mold (5) are also provided with four air ejector demolding mechanisms (10) corresponding to the support foot mounting part molding grooves (8).

2. The in-mold air-pump demolding mechanism for the injection mold of the plastic storage box according to claim 1, characterized in that, The air ejector demolding mechanism (10) includes a vertical air ejector channel (11) located at the bottom of the forming groove (8) of the support foot mounting part and vertically penetrating the core mold (5), and an air inlet channel (12) located in the lower template (3) and connected to the bottom of the vertical air ejector channel (11).

3. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 2, characterized in that, The top of the vertical air top channel (11) has a valve mounting groove (13), and a valve is provided in the valve mounting groove (13).

4. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 1, characterized in that, The support foot mounting groove (8) is arc-shaped. The combined support foot forming structure (9) includes an arc-shaped mounting block (14) that protrudes from the bottom of the upper template (1) and is adapted to the support foot mounting groove (8). The arc-shaped mounting block (14) has a rectangular inlay mounting groove. The upper template (1) is fitted with a support foot forming block (15) that penetrates the upper template (1) vertically and is inserted into the inlay mounting groove at the bottom. The support foot forming block (15) has a rectangular cross-section. A rectangular support foot forming groove (16) is formed between the circumferential sidewall of the support foot forming block (15) and the inner sidewall of the inlay mounting groove.

5. The in-mold air-pump demolding mechanism for the injection mold of the plastic storage box according to claim 4, characterized in that, The support foot forming block (15) is slidably set on the upper template (1). The upper template (1) is provided with a forming block fixing plate (17) on the top. The top of the support foot forming block (15) is detachably fixed to the forming block fixing plate (17) by several bolts.

6. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 1, characterized in that, The X-type multi-point glue injection mechanism (7) includes an X-type injection plate (18) set on the upper side of the upper template (1). Five injection tubes (19) are fixedly connected to the bottom of the X-type injection plate (18). The five injection tubes (19) are respectively set in the middle of the X-type injection plate (18) and on the four support arms.

7. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 1, characterized in that, The bottom outer edge of the core mold base (4) is recessed inward and has an outer edge forming groove (20). The bottom of the intermediate template (2) is also provided with two cover connecting plate forming blocks (21) connected to one side wall of the storage box forming cavity (6). The bottom of the cover connecting plate forming block (21) is inserted into the outer edge forming groove (20). The cover connecting plate forming block (21) has two connecting plate forming grooves (22).

8. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 7, characterized in that, The cover connecting plate forming block (21) is detachably fixed to the intermediate template (2) by several screws.

9. The in-mold air-cushion demolding mechanism for the injection mold of the plastic storage box according to claim 1, characterized in that, The top of the intermediate template (2) is also recessed inward and has an annular coolant connection channel (23). The bottom of the coolant connection channel (23) has several external cooling channels (24) evenly distributed around the circumference of the housing box forming cavity (6).

10. The in-mold air ejection mechanism for the injection mold of the plastic storage box according to claim 9, characterized in that, The core mold (5) is also provided with several internal cooling channels (25).

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