Injection blow mold

Abstract

The utility model provides an injection blow mold, which is applied to blow molding equipment and comprises an upper mold assembly, a lower mold assembly and a lower mold assembly, the upper mold assembly comprises an upper mold base and an upper injection mold core, the upper injection mold core is arranged on the upper mold base, and an upper cavity and an upper product cavity are arranged on the upper injection mold core; the lower mold assembly comprises a lower mold base and a lower injection mold core, the lower injection mold core is arranged on the lower mold base, and a lower cavity and a lower product cavity are formed in the lower injection mold core; isolation assemblies are arranged in the upper injection mold core and the lower injection mold core; the isolation assemblies are detachably connected to the upper injection mold core and the lower injection mold core; a core cavity is formed in the isolation assembly, and the upper cavity, the lower cavity and the core cavity are combined to form a blowing cavity; and the upper product cavity and the lower product cavity are combined to form a forming cavity. The injection-blow mold solves the problem that heat exchange between an injection molding part and an air blowing part in a traditional injection-blow mold is contradictory.

Description

Technical Field

[0001] This utility model relates to the field of blow molding technology, and more specifically to an injection blow mold. Background Technology

[0002] In the production and application of integrated injection blow molding, product quality and production efficiency are key considerations. Currently, the injection core of traditional integrated injection blow molding molds is mostly a one-piece molding structure, with the blowing area and the molding area interconnected. From the perspective of the injection blow molding process principle, the blowing stage requires a high-temperature environment. High temperatures enhance the fluidity of the blown gas, facilitating the softening of the plastic melt and uniform deformation under gas pressure, thus shaping a precise internal product shape (such as the cavity shape of a plastic bottle) and improving production efficiency. In the molding stage, a low-temperature environment is crucial. It accelerates the cooling and solidification of the plastic melt, ensuring rapid product shaping, guaranteeing dimensional accuracy, and improving product performance.

[0003] However, because the two areas in the existing mold structure are connected, the high temperature in the blowing area is uncontrollably conducted to the molding area, resulting in excessively high temperatures in the molding area. This not only greatly prolongs the molding cycle and reduces production efficiency, but also causes serious quality problems such as large product dimensional deviations, uneven wall thickness, and internal stress concentration, leading to a significant increase in the defect rate. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art and provide an injection blow mold, which aims to solve the problem of heat exchange contradiction between the injection part and the blowing part in traditional injection blow molds.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A blow molding die, used in blow molding equipment, comprising:

[0007] The upper mold assembly includes an upper mold base and an upper injection mold core. The upper injection mold core is disposed on the upper mold base and has an upper cavity and an upper product cavity.

[0008] The lower mold assembly includes a lower mold base and a lower injection mold core. The lower injection mold core is disposed on the lower mold base and has a lower cavity and a lower product cavity. The upper mold base and the lower mold base are slidably connected by a guide mechanism.

[0009] Both the upper injection mold core and the lower injection mold core are provided with isolation components, which are detachably connected to the upper injection mold core and the lower injection mold core; the isolation components are provided with core cavities, and the upper cavity, the lower cavity and the core cavity are combined to form an air blowing cavity; the upper product cavity and the lower product cavity are combined to form a molding cavity;

[0010] A mandrel device, which is embedded in the air-blowing cavity, is used to deliver air to form a cavity inside the workpiece.

[0011] In one embodiment, the upper injection mold core and the lower injection mold core are provided with mounting grooves, the isolation component is embedded in the mounting grooves, the upper cavity, the core cavity and the upper product cavity are sequentially connected, and the lower cavity, the core cavity and the lower product cavity are sequentially connected.

[0012] In one embodiment, the injection blow molding die further includes a hot runner system connected to the upper mold base and disposed adjacent to the upper injection core; the hot runner system is used to transport molten plastic into the molding cavity.

[0013] In one embodiment, the surface of the isolation component is provided with a clearance groove.

[0014] In one embodiment, the surface of the isolation component is provided with a ceramic coating.

[0015] In one embodiment, the mandrel device includes a mounting pad and a plurality of mandrel assemblies, the mounting pad being disposed adjacent to the injection mold core; one end of each mandrel assembly is connected to the mounting pad, and the other end is embedded in the blowing cavity and communicates with the molding cavity.

[0016] In one embodiment, the isolation assembly comprises a plurality of injection neck blocks, and the number of the mandrel assembly, the injection neck blocks, the upper cavity, the lower cavity, the core cavity, and the molding cavity are all equal.

[0017] In one embodiment, each of the injection neck blocks has the clearance groove on the outer surface of the upper injection mold core or the lower injection mold core.

[0018] In one embodiment, the hot runner system includes a needle valve assembly and a temperature control unit, the number of which is equal to the number of the mandrel assemblies; the temperature control unit is electrically connected to the needle valve assembly, and the needle valve assembly is used to control the on / off flow of molten plastic to the molding cavity.

[0019] In one embodiment, the needle valve assembly includes a driving component, a valve needle, and a valve needle sleeve. One end of the valve needle sleeve is connected to the outlet of the hot runner system, and the other end is connected to the inlet of the molding cavity. The upper end of the valve needle is connected to the output end of the driving component, and the lower end of the valve needle engages with the outlet of the hot runner system. The temperature control unit is located on the valve needle sleeve near the inlet of the molding cavity.

[0020] The advantages of this invention compared to the prior art are as follows: by setting independent and detachable isolation components in the upper and lower injection mold cores, the heat exchange between the blowing cavity and the molding cavity is effectively reduced, so that the blowing cavity can stably maintain a high temperature to meet the requirements of good gas flow and full softening of plastic; while the molding cavity maintains a low temperature to achieve rapid curing and shaping of plastic, ensuring the dimensional accuracy and performance of the product, and greatly optimizing the temperature environment of the two cavities to meet their respective process requirements.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of an injection blow mold during mold closing, provided by this utility model;

[0023] Figure 2 A schematic diagram of the overall structure of an injection blow mold during mold opening, provided by this utility model;

[0024] Figure 3 This is a partial structural diagram of an injection blow molding die provided by the present invention;

[0025] Figure 4 A partial structural plan view of an injection blow molding die provided by this utility model;

[0026] Figure 5 This is a partial structural diagram of an injection blow molding die provided by the present invention;

[0027] Figure 6 A schematic diagram of the mandrel device for an injection blow mold provided by this utility model;

[0028] Figure 7 A schematic diagram of the structure of an isolation component for an injection blow mold provided by this utility model;

[0029] Figure 8 A cross-sectional schematic diagram of the hot runner system of an injection blow mold provided by this utility model, showing the start of the injection process;

[0030] Figure 9 This is a cross-sectional schematic diagram of the hot runner system of an injection blow mold at the end of the injection process, which is provided by this utility model.

[0031] Figure Labels

[0032] 1. Upper mold assembly; 11. Upper mold base; 111. Connecting guide sleeve; 12. Upper injection core; 121. Upper cavity; 122. Upper product cavity; 123. Mounting slot; 2. Lower mold assembly; 21. Lower mold base; 211. Connecting guide post; 22. Lower injection core; 221. Lower cavity; 222. Lower product cavity; 3. Isolation assembly; 31. Injection neck block; 311. Clearance groove; 312. Core cavity; 4. Mandrel assembly; 41. Mounting pad; 42. Mandrel assembly; 5. Hot runner system; 51. Needle valve assembly; 511. Drive component; 512. Valve needle; 513. Valve needle sleeve; 6. Air blowing cavity; 7. Molding cavity. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] See Figures 1 to 9 As shown, this utility model embodiment discloses an injection blow mold, applied to blow molding equipment, comprising:

[0039] The upper mold assembly 1 includes an upper mold base 11 and an upper injection mold core 12. The upper injection mold core 12 is disposed on the upper mold base 11 and has an upper cavity 121 and an upper product cavity 122.

[0040] The lower mold assembly 2 includes a lower mold base 21 and a lower injection mold core 22. The lower injection mold core 22 is disposed on the lower mold base 21 and has a lower cavity 221 and a lower product cavity 222. The upper mold base 11 and the lower mold base 21 are slidably connected by a guide mechanism.

[0041] Both the upper injection mold core 12 and the lower injection mold core 22 are provided with isolation components 3, which are detachably connected to the upper injection mold core 12 and the lower injection mold core 22; the isolation component 3 is provided with a core cavity 312, and the upper cavity 121, the lower cavity 221 and the core cavity 312 are combined to form an air blowing cavity 6; the upper product cavity 122 and the lower product cavity 222 are combined to form a molding cavity 7;

[0042] The mandrel device 4 is embedded in the air-blowing cavity 6 and is used to transport air to form a cavity inside the workpiece.

[0043] Specifically, the upper mold assembly 1 consists of an upper mold base 11 and an upper injection mold core 12. The upper mold base 11 is the basic support structure of the upper mold part, providing the installation position and stability for the upper injection mold core 12. The upper injection mold core 12 is mounted on the upper mold base 11, and has an upper cavity 121 and an upper product cavity 122. The upper cavity 121 is part of the blowing cavity 6, which, together with other parts, contains compressed air during blow molding; the upper product cavity 122 is part of the molding cavity 7, used to shape the upper part of the product.

[0044] The lower mold assembly 2 includes a lower mold base 21 and a lower injection mold core 22. The lower mold base 21 provides support for the lower injection mold core 22 and is slidably connected to the upper mold base 11 through a guide mechanism, ensuring accurate alignment of the upper mold base 11 and the lower mold base 21 during mold opening and closing. The lower injection mold core 22 has a lower cavity 221 and a lower product cavity 222. The lower cavity 221 is also part of the blowing cavity 6, and together with the upper cavity 121 and the core cavity 312, it forms a complete blowing space; the lower product cavity 222 and the upper product cavity 122 combine to form a complete molding cavity 7, used to shape the overall shape of the product.

[0045] It is understood that the guiding mechanism includes a connecting guide post 211 and a connecting guide sleeve 111. The connecting guide post 211 is fixedly connected to the lower mold base 21, and the connecting guide sleeve 111 is fixedly connected to the upper mold base 11. The connecting guide sleeve 111 is sleeved on the outer wall of the connecting guide post 211. When the injection blow molding die needs to complete the mold opening or closing action, the connection between the connecting guide sleeve 111 and the connecting guide post 211 provides a moving track for mold opening and closing, thereby ensuring the safety of mold opening and closing.

[0046] Isolation components 3 are installed in both the upper injection mold core 12 and the lower injection mold core 22, and these isolation components 3 are detachably connected to the upper injection mold core 12 and the lower injection mold core 22. This detachable design facilitates the replacement, maintenance, or cleaning of the isolation components 3. The isolation components 3 have a core cavity 312, which, together with the upper cavity 121 and the lower cavity 221, forms a blowing cavity 6. Its function is to isolate the blowing cavity 6 and the molding cavity 7 during injection molding and blow molding, reducing heat transfer and mutual interference between them, and achieving temperature control in different areas. During blow molding, the blowing cavity 6 requires a higher temperature to ensure airflow and plasticity, while the molding cavity 7 requires a lower temperature to allow the plastic to cool and solidify quickly. The isolation components 3 slow down heat exchange between the two areas, improving cooling efficiency and ensuring that each area maintains suitable temperature conditions. This improves product quality and performance, and avoids defects such as product deformation, bubbles, uneven wall thickness, and dimensional inaccuracies caused by uneven temperature. It is understandable that both the upper injection mold core 12 and the lower injection mold core 22 are equipped with independent cooling water channels (not shown) corresponding to the molding cavity 7 and the blowing cavity 6, so as to individually control the temperature of each cavity and further ensure that the molding cavity 7 and the blowing cavity 6 are maintained under suitable temperature conditions.

[0047] The mandrel device 4 is embedded in the blowing cavity 6 and is mainly used for blowing operations in the blow molding mold. At the beginning of the blow molding process, after the molten plastic is injected into the molding cavity 7, the mandrel device 4 introduces compressed air into the blowing cavity 6. The air pressure is used to make the plastic adhere to the inner wall of the molding cavity 7, thereby forming a plastic product with a specific shape and internal cavity.

[0048] In one embodiment, the upper injection mold core 12 and the lower injection mold core 22 are provided with mounting grooves 123, the isolation component 3 is embedded in the mounting grooves 123, the upper cavity 121, the core cavity 312 and the upper product cavity 122 are connected in sequence, and the lower cavity 221, the core cavity 312 and the lower product cavity 222 are connected in sequence.

[0049] Specifically, both the upper injection mold core 12 and the lower injection mold core 22 have mounting grooves 123 machined inside, and the isolation component 3 is embedded in these mounting grooves 123. This installation method not only ensures the fixed position of the isolation component 3 in the mold, but also makes the connection between the isolation component 3 and the upper injection mold core 12 and the lower injection mold core 22 relatively tight, which can effectively prevent displacement during injection molding and blow molding, and ensure the stability of the mold structure. The upper cavity 121, the core cavity 312 and the upper product cavity 122 are connected in sequence, and the lower cavity 221, the core cavity 312 and the lower product cavity 222 are also connected in sequence. This connection relationship creates a flow channel for the plastic melt and the gas during the blowing process. In the injection molding stage, the plastic melt can flow smoothly into the molding cavity 7 through this channel; in the blow molding stage, compressed air can enter from the mandrel device 4 in the blowing cavity 6, act on the plastic melt in the molding cavity 7, make it conform to the inner wall of the mold, and finally form the desired plastic product shape.

[0050] In one embodiment, the injection blow molding die further includes a hot runner system 5, which is connected to the upper mold base 11 and disposed adjacent to the upper injection core 12; the hot runner system 5 is used to transport molten plastic into the molding cavity 7.

[0051] Specifically, the hot runner system 5 is connected to the upper mold base 11 and positioned close to the upper injection mold core 12. This layout shortens the distance between the hot runner system 5 and the molding cavity 7 on the upper injection mold core 12, reducing heat loss and pressure drop of the molten plastic during the delivery process. Through its connection to the upper mold base 11, the hot runner system 5 maintains a stable position during mold opening and closing, ensuring accurate plastic delivery. The core function of the hot runner system 5 is to deliver molten plastic into the molding cavity 7. Before the injection molding process begins, the plastic raw material is heated to a molten state inside the hot runner system 5. This uniformly molten plastic is then directly delivered into the molding cavity 7 through the internal channels and related passages of the hot runner system 5. Compared to traditional cold runner systems, hot runner systems 5 maintain the plastic in a high-temperature molten state throughout the process, enabling more precise control of the plastic's flow rate and volume. This allows the molten plastic to fill the molding cavity 7 evenly, reducing defects caused by uneven filling, such as missing material, flash, and weld lines. It also improves the dimensional accuracy and surface quality of the product, resulting in better product consistency.

[0052] In one embodiment, the surface of the isolation component 3 is provided with a clearance groove 311.

[0053] Specifically, the surface of the isolation component 3 is provided with an air-retaining groove 311, so that the isolation component 3 is not completely fitted with the upper injection mold core 12 and the lower injection mold core 22, but forms a space containing air. Air is a good heat insulation medium with a relatively low thermal conductivity, which can effectively hinder heat transfer. When the heat of the isolation component 3 attempts to transfer to the upper injection mold core 12 and the lower injection mold core 22, the air layer in the air-retaining groove 311 acts as a buffer and heat insulation. The heat transfer speed in the air layer is slower, and most of the heat is blocked on one side of the air layer, thereby reducing the heat transfer from the isolation component 3 to the upper injection mold core 12 and the lower injection mold core 22, and preventing the upper injection mold core 12 and the lower injection mold core 22 from overheating. At the same time, a stable temperature environment helps to reduce the damage to the upper injection mold core 12 and the lower injection mold core 22 caused by thermal stress such as thermal expansion and contraction, reduces the wear and deformation of the mold, extends the service life of the mold, and reduces the frequency of mold replacement and maintenance costs.

[0054] In one embodiment, the surface of the isolation component 3 is provided with a ceramic coating.

[0055] Specifically, the isolation component 3 plays a crucial role in isolating the blow-through cavity 6 and the molding cavity 7, ensuring the maintenance of different temperature environments in the two areas. Applying a ceramic coating to the surface of the isolation component 3 utilizes the unique properties of ceramic materials to optimize its function. The ceramic coating adheres tightly to the surface of the isolation component 3, forming an additional protective and functional layer. Ceramic materials typically have low thermal conductivity, allowing the ceramic coating to effectively block heat transfer. During injection molding, whether from the high temperature of the blow-through cavity 6 or other heat sources, the ceramic coating significantly slows down heat conduction to the molding cavity 7, further enhancing the insulation effect of the isolation component 3 and ensuring a more stable temperature within the molding cavity 7, which is beneficial for high-quality product molding.

[0056] In one embodiment, the mandrel device 4 includes a mounting pad 41 and a plurality of mandrel assemblies 42. The mounting pad 41 is disposed adjacent to the injection mold core 22. One end of the mandrel assembly 42 is connected to the mounting pad 41, and the other end is embedded in the blowing cavity 6 and communicates with the molding cavity 7.

[0057] Specifically, the mandrel assembly 4 is a key component for realizing the blow molding process and shaping the internal cavity of the product. It consists of a mounting pad 41 and several mandrel assemblies 42. The mounting pad 41 is located adjacent to the injection mold core 22. It can be understood that the mounting pad 41 is connected to an external device (not shown), which provides a mounting base for the mounting pad 41 and provides energy and gas source for the blowing of the mandrel assembly 4. The adjacent arrangement of the mandrel assembly 4 and the injection mold core 22 helps the mandrel assemblies 42 to accurately align with the blowing cavity 6 and the molding cavity 7, ensuring accurate spatial relationships between the components.

[0058] Several mandrel assemblies 42 have one end securely connected to the mounting pad 41, and the other end embedded in the blowing cavity 6 and communicating with the molding cavity 7. On the one hand, the mandrel assembly 42 serves as a blowing channel, introducing compressed air into the blowing cavity 6, which then acts on the plastic melt in the molding cavity 7, causing the plastic to adhere to the inner wall of the mold under air pressure, forming the required product shape and internal cavity. On the other hand, the precise positioning and installation of the mandrel assembly 42 ensures the stability and consistency of the blowing process, ensuring that the dimensional accuracy and shape of the internal cavity of the product meet the design requirements.

[0059] Understandably, the mandrel assembly 42 should be kept in a high-temperature environment so that the compressed air introduced in the subsequent blow molding process remains at a high temperature. This allows the plastic melt in contact with the high-temperature air to soften and flow better during the blow molding process, which helps the plastic melt to fill the molding cavity 7 more evenly under air pressure, thus shaping the ideal product shape and internal cavity structure.

[0060] In one embodiment, the isolation component 3 is composed of a plurality of injection neck blocks 31, and the number of the mandrel assembly 42, the injection neck blocks 31, the upper cavity 121, the lower cavity 221, the core cavity 312 and the molding cavity 7 are all equal.

[0061] Specifically, the isolation component 3 consists of several injection neck blocks 31. As the basic unit of the isolation component 3, the injection neck blocks 31 play a crucial role in isolation and guidance within the mold. Simultaneously, the number of mandrel assemblies 42, injection neck blocks 31, upper cavities 121, lower cavities 221, core cavities 312, and molding cavities 7 are designed to be equal. The mandrel assembly 42 is responsible for providing compressed air during the blow molding process to form the internal cavities of the product; the isolation component 3, composed of injection neck blocks 31, separates and insulates the blown air cavity 6 and the molding cavity 7; the upper cavity 121, lower cavity 221, and core cavities 312 together form the blown air cavity 6, providing a channel and working space for compressed air; the molding cavity 7 is the area where the molten plastic is finally molded into the product. When the number of these key components is equal, it ensures precise coordination between the components, enabling simultaneous injection molding and blow molding of multiple products. Each mandrel assembly 42 can independently supply compressed air into its corresponding molding cavity 7, and each neck block 31 can independently isolate and insulate its corresponding blowing and molding areas. This synchronous operation greatly improves production efficiency, allowing multiple identical products to be produced simultaneously in a single injection and blow molding cycle, making it suitable for large-scale industrial production. Furthermore, since each production unit (consisting of a mandrel assembly 42, a neck block 31, a set of cavities, and a molding cavity 7) is relatively independent and structurally identical, the temperature, pressure, gas flow, and other process conditions experienced by each product during molding are essentially the same. This results in a high degree of consistency in dimensional accuracy, appearance quality, and physical properties among the produced products, reducing product variations and improving overall product quality and yield.

[0062] In one embodiment, each of the injection neck blocks 31 is provided with the clearance groove 311 on the outer surface of the upper injection mold core 12 or the lower injection mold core 22.

[0063] Specifically, the isolation component 3 consists of multiple injection neck blocks 31. The injection neck blocks 31 are fitted to the sidewall of the mounting groove 123 of the upper injection mold core 12 or the lower injection mold core 22. The injection neck blocks 31 have clearance grooves 311 on their outer surfaces that fit with the mounting groove 123. The number of clearance grooves 311 is increased according to the actual contact area between the isolation component 3 and the upper injection mold core 12 and the lower injection mold core 22, so as to effectively block the heat transfer between the injection neck blocks 31 and the upper and lower injection mold cores 12 and 22. These clearance grooves 311 form an air layer on the contact surface. Air has a low thermal conductivity and can hinder heat conduction.

[0064] In one embodiment, the hot runner system 5 is provided with a needle valve assembly 51 and a temperature control unit, the number of needle valve assemblies 51 and the temperature control unit being equal to the number of mandrel assemblies 42; the temperature control unit is electrically connected to the needle valve assembly 51, and the needle valve assembly 51 is used to control the on / off flow of molten plastic to the molding cavity 7.

[0065] Specifically, in this embodiment, a needle valve assembly 51 and a temperature control unit are provided, and the number of needle valve assemblies 51 and temperature control units is equal to the number of mandrel assemblies 42. This numerical correspondence is to achieve precise plastic delivery control for each molding cavity 7. Each needle valve assembly 51 acts as a switch in the hot runner system 5, directly controlling whether molten plastic can be delivered from the hot runner system 5 to the corresponding molding cavity 7. When the needle valve assembly 51 is open, molten plastic can flow smoothly into the molding cavity 7; when the needle valve assembly 51 is closed, the plastic delivery is cut off.

[0066] The temperature control unit is electrically connected to the needle valve assembly 51, and its main function is to monitor and regulate the temperature of the plastic in the hot runner system 5. Because the flowability and molding quality of plastic are closely related to temperature, only at a suitable temperature can the plastic be injected into the molding cavity 7 in a good state. The temperature control unit can adjust the heating or cooling of the hot runner system 5 in real time according to a preset temperature value to ensure that the plastic is always within a suitable temperature range. Simultaneously, the temperature control unit can also provide feedback control to the needle valve assembly 51 based on temperature conditions. For example, when the temperature is too low and the flowability of the plastic deteriorates, the conveying speed or on / off state of the plastic can be adjusted by controlling the needle valve assembly 51. Furthermore, each temperature control unit independently controls a needle valve assembly 51, enabling precise temperature and plastic flow rate regulation for each molding cavity 7. Different molding cavities 7 may have different requirements for plastic temperature and flow rate due to factors such as location, shape, and plastic filling volume. Through independent control, it can be ensured that the plastic in each molding cavity 7 is under optimal molding conditions, thereby improving the molding quality and consistency of the product. For example, for products with complex shapes, different parts may require different plastic filling speeds and temperatures, and this independent control method can well meet the needs.

[0067] In one embodiment, the needle valve assembly 51 includes a driving component 511, a valve needle 512, and a valve needle sleeve 513. One end of the valve needle sleeve 513 is connected to the outlet of the hot runner system 5, and the other end is connected to the inlet of the molding cavity 7. The upper end of the valve needle 512 is connected to the output end of the driving component 511, and the lower end of the valve needle 512 is engaged with the outlet of the hot runner system 5. The temperature control unit is disposed on the valve needle sleeve 513 near the inlet of the molding cavity 7.

[0068] Specifically, the needle valve assembly 51 plays a crucial role in controlling the flow of molten plastic. It mainly consists of a drive component 511, a valve needle 512, and a valve needle sleeve 513. The valve needle sleeve 513 acts as a bridge connecting the hot runner system 5 and the molding cavity 7, with one end connected to the outlet of the hot runner system 5 and the other end connected to the inlet of the molding cavity 7. This connection provides a specific channel for the molten plastic to flow from the hot runner system 5 to the molding cavity 7, ensuring that the plastic is accurately delivered to the area requiring molding. The upper end of the valve needle 512 is connected to the output end of the drive component 511, and the lower end engages with the outlet of the hot runner system 5. The drive component 511 can drive the valve needle 512 to move up and down. When the valve needle 512 moves downward and blocks the outlet of the hot runner system 5, the flow of molten plastic is cut off; when the valve needle 512 moves upward away from the outlet, the molten plastic can flow into the molding cavity 7 through the valve needle sleeve 513. In this way, precise control of the flow of molten plastic is achieved. The temperature control unit is positioned on the valve needle sleeve 513 near the inlet of the molding cavity 7. This is because, at this location, the temperature control unit can monitor the temperature of the molten plastic about to enter the molding cavity 7 in real time. Since the temperature of the plastic has a crucial impact on its flowability and molding quality, placing the temperature control unit here allows for more precise temperature regulation of the plastic, ensuring it is in optimal molding condition when entering the molding cavity 7.

[0069] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A blow molding die, used in blow molding equipment, characterized in that, include: The upper mold assembly includes an upper mold base and an upper injection mold core. The upper injection mold core is disposed on the upper mold base and has an upper cavity and an upper product cavity. The lower mold assembly includes a lower mold base and a lower injection mold core. The lower injection mold core is disposed on the lower mold base and has a lower cavity and a lower product cavity. The upper mold base and the lower mold base are slidably connected by a guide mechanism. Both the upper injection mold core and the lower injection mold core are provided with isolation components, which are detachably connected to the upper injection mold core and the lower injection mold core; the isolation components are provided with core cavities, and the upper cavity, the lower cavity and the core cavity are combined to form an air blowing cavity; the upper product cavity and the lower product cavity are combined to form a molding cavity; A mandrel device, which is embedded in the air-blowing cavity, is used to deliver air to form a cavity inside the workpiece.

2. The injection blow molding die according to claim 1, characterized in that, The upper injection mold core and the lower injection mold core are provided with mounting grooves, the isolation component is embedded in the mounting grooves, the upper cavity, the core cavity and the upper product cavity are connected in sequence, and the lower cavity, the core cavity and the lower product cavity are connected in sequence.

3. The injection blow molding die according to claim 1, characterized in that, The injection blow molding die also includes a hot runner system, which is connected to the upper mold base and disposed adjacent to the upper injection core; the hot runner system is used to transport molten plastic into the molding cavity.

4. The injection blow molding die according to claim 3, characterized in that, The surface of the isolation component is provided with a clearance groove.

5. The injection blow molding die according to claim 3, characterized in that, The surface of the isolation component is coated with a ceramic coating.

6. The injection blow molding die according to claim 4, characterized in that, The mandrel assembly includes a mounting pad and several mandrel assemblies. The mounting pad is disposed adjacent to the injection mold core. One end of each mandrel assembly is connected to the mounting pad, and the other end is embedded in the air blowing cavity and communicates with the molding cavity.

7. The injection blow molding die according to claim 6, characterized in that, The isolation assembly consists of several injection neck blocks, and the number of the mandrel assembly, the injection neck blocks, the upper cavity, the lower cavity, the core cavity, and the molding cavity are all equal.

8. The injection blow molding die according to claim 7, characterized in that, Each of the injection neck blocks has a clearance groove on the outer surface of the upper injection mold core or the lower injection mold core.

9. A blow molding die according to claim 7, characterized in that, The hot runner system is equipped with needle valve assemblies and temperature control units. The number of needle valve assemblies and temperature control units is equal to the number of mandrel assemblies. The temperature control units are electrically connected to the needle valve assemblies. The needle valve assemblies are used to control the on / off flow of molten plastic to the molding cavity.

10. A blow molding die according to claim 9, characterized in that, The needle valve assembly includes a driving component, a valve needle, and a valve needle sleeve. One end of the valve needle sleeve is connected to the outlet of the hot runner system, and the other end is connected to the inlet of the molding cavity. The upper end of the valve needle is connected to the output end of the driving component, and the lower end of the valve needle engages with the outlet of the hot runner system. The temperature control unit is located on the valve needle sleeve near the inlet of the molding cavity.

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