Full-integral hot runner and gas path integrated device and injection molding method

Abstract

The invention discloses a full-integral hot runner and gas path integrated device, and relates to a hot runner system in injection molding equipment. Comprising a valve plate, a plurality of vertical hot runner conveying pipes installed below the valve plate, a plurality of valve needles which are arranged in the hot runner conveying pipes and can move up and down, a plurality of driving assemblies used for driving the valve needles to open and close injection molding holes of the conveying pipes, and a cover plate used for limiting the driving assemblies through alignment grooves. The valve plate is in a porous frame shape, and a through hole is formed in the center of the alignment groove and aligned to the adjusting end face of the valve needle. A connecting hole is formed in the center of a piston disc of the driving assembly and connected with the needle root portion of the valve needle in a rotatable and adjustable mode, so that the relative length distance between the needle tip portion of the valve needle and the piston disc of the driving assembly is adjustable, and the extending length of the valve needle is adjusted on the premise that a mold is not disassembled; the problem that a hot runner injection molding hole cannot be closed tightly due to needle point loss of the valve needle is solved. In an example, the drive assembly includes a piston disc, an aggregate bowl, a drive block, and a drive cylinder to modularize an externally connected wire.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment for plastic processing in high-end equipment manufacturing, and in particular to a fully integrated hot runner and air path integrated device, which is a front-end mold combination of an injection mold. Background Art

[0002] With the diversification of product shapes and high-precision requirements, single injection port technology cannot meet the requirements, so multi-injection port hot runner technology is needed to form a high-precision and complex-shaped product. Specifically, multi-injection port hot runner technology is widely used in multi-point injection plastic molds in industries such as televisions and monitors, significantly improving the efficiency and product quality of injection molding. Traditional hot runner technology realizes the air supply of the driving cylinder by processing air channels on the mold template. The design and processing of these air channels are crucial to the overall performance of the mold. Hot runner technology not only improves production efficiency and reduces scrap rate, but also reduces labor intensity, making the injection molding process stable and reliable. In practical applications, in order to meet the diverse needs of different injection molding products, the existing technology usually adopts a variety of methods to solve the problem of air channel layout. At present, the air channel can be directly processed on the mold template, or external pipes can be used to connect each driving cylinder.

[0003] Specifically, common hot runner drive pipe processing methods include: 1. Direct processing method: Process the airway inside the mold template and ensure the size and position accuracy of the airway through precision machining; this method is suitable for small molds, but as the mold size increases, the processing difficulty and cost will increase significantly; 2. External pipeline method: Use external stainless steel pipes or other pipes to connect each driving cylinder, and flexibly arrange the pipes to adapt to complex mold structures. Although this method can reduce the difficulty of processing inside the mold, it increases the workload of assembly and maintenance. 3. Modular design: The gas system is designed as modular components and connected to the mold through standardized interfaces; this design can improve the flexibility and maintainability of the system, but it still has certain limitations in practical applications, such as leakage risk at the interface and assembly complexity.

[0004] However, the above methods all have some shortcomings in practical applications. Although the direct processing method can ensure the accuracy of the airway, the overall cost of the mold is high due to the large thickness of the mold template, and the machining cost of the airway is also relatively high. The external pipeline method faces challenges in assembly and maintenance. Especially in the case of multi-point gluing, the layout and connection of the airway become very complicated, prone to errors and failures. In addition, no matter which method is used, the cleaning and maintenance of the airway are relatively difficult, and it is not easy to find the corresponding controlled nozzle points during the production process, which brings inconvenience to machine adjustment and production. Therefore, how to simplify the layout of the airway, reduce manufacturing and maintenance costs, and improve the reliability and ease of operation of the system is a technical problem that needs to be solved urgently.

[0005] Regarding a specific structure of the external pipeline method, the applicant proposed a TV face frame full-needle hot runner system in the invention patent publication number CN113352556A, including: a base of the mold; a valve plate installed on the top of the base and adapted to the base; multiple hot runners (equivalent to upright hot runner delivery pipes) whose bottom is movably inserted in the base and whose top is detachably assembled with the valve plate; a positioning member arranged on the valve plate to position the top of the hot runner; an opening and closing device installed on the valve plate for sealing or unsealing the runner opening (equivalent to the injection hole) at the bottom of the hot runner; and a cover plate installed on the top of the valve plate. The opening and closing device includes a cylinder (a type of drive component) installed on the top of the valve plate, and a valve stem (equivalent to a valve needle) is arranged in the hot runner. The existing hot runner system in the related art can easily disassemble and assemble the hot runner as a whole during maintenance when in use. However, during long-term use, the valve stem with a long stem body will become shorter due to friction loss at the end of the opening and closing flow channel, or after the hot runner system device is installed in the injection molding equipment, it may be found that the valve stem is not tightly closed. The hot runner system device can only be removed and the interior disassembled to replace the valve stem, which is not conducive to efficient injection molding production.

[0006] Regarding a specific driving component of a hot runner system, the applicant proposed a hydraulic cylinder and a hot runner device having the hydraulic cylinder in the invention patent publication number CN112303058A. The hydraulic cylinder of the hot runner device includes: a cylinder body with an oil chamber, a piston is arranged in the oil chamber, the upper end of the piston passes through the upper wall of the cylinder body, the lower end of the piston passes through the lower wall of the cylinder body, the cylinder body is provided with a first oil hole connected to the top of the oil chamber and a second oil hole connected to the bottom of the oil chamber, the hydraulic cylinder also includes a cooling block and an end cover, the cooling block is fixedly arranged on the bottom surface of the cylinder body, the end cover is fixedly arranged on the bottom surface of the cooling block, an insulating cavity is arranged between the cooling block and the end cover, and the cooling block is provided with a clearance hole for the piston to be lifted and lowered. The related technology uses the cooling cover and its cooling mechanism located between the bottom of the cylinder body and the top of the end cover of the hydraulic cylinder to improve its own stability and the working stability of the hot runner device.

[0007] Utility model patent number CN220700286U discloses a small single-nozzle oil cylinder hot runner system, including a valve needle assembly used in conjunction with the runner, a heating body used in conjunction with the runner for heating, and an oil cylinder that drives the valve needle assembly to move up and down. A heating valve needle bushing is also provided at the bottom of the valve needle assembly, and an adjustable stroke bushing is also provided in the cylinder sleeve of the oil cylinder. In the related art, the adjustable stroke bushing in the cylinder sleeve of the oil cylinder can adjust the different strokes of the entire single-point hot runner system to control the stroke height of the valve needle switch. However, in the related art, the adjustable stroke bushing is provided in the cylinder sleeve of the oil cylinder, and it is necessary to first disassemble the hot runner system mold, and then disassemble the oil cylinder used to drive the valve needle to move up and down, in order to replace the bushing with a suitable stroke.

[0008] In fact, in the new generation of hot runner mold systems, the hot runner delivery pipes and the matching valve needles are configured in multiple arrays and are universal. On the injection molding production line, a hot runner mold system can be matched with injection molds of various different products. In the combination of a hot runner mold system and an injection mold of various different products, some hot runner delivery pipes are always kept closed by the corresponding matching valve needles. There is no corresponding glue inlet hole in the product mold. The closure of the valve needle ensures that the injection molding glue does not overflow outside the product mold; some other hot runner delivery pipes are operated by the valve needle during the injection molding process, resulting in the loss rate of the valve needles used for switching in some other hot runner delivery pipes being higher than the loss rate of the valve needles that are always closed in some hot runner delivery pipes. Under the long-term use of different valve needle loss rates, some valve needles will be excessively worn out, resulting in the technical problem of not being able to close the corresponding injection hole of the hot runner delivery pipe. Summary of the invention

[0009] The main purpose of the present invention is to provide a fully integrated hot runner gas circuit integrated device and its drive assembly. The main improvement is to solve the problem that the mold needs to be disassembled to replace the valve needle due to valve needle tip wear, and also solve the technical problem that some valve needles that are excessively worn cannot tightly close the injection holes corresponding to the hot runner delivery pipes.

[0010] The second main purpose of the present invention is to provide an injection molding method, which is used to flexibly adjust the relative length distance between the valve needle tip and the piston disk of the drive assembly from the back of the device without disassembling the mold, thereby solving the problem of leakage of some hot runner output pipes in injection molding production.

[0011] The main purpose of the present invention is achieved through the following technical solutions: A fully integrated hot runner gas path device is proposed, comprising: The valve plate has a porous frame shape, the upper surface of the valve plate has a plurality of mounting positions, a plurality of vertical hot runner delivery pipes are arranged below the valve plate, and the remote ends of the hot runner delivery pipes have injection holes; A plurality of valve needles capable of lifting and moving are correspondingly arranged in the hot runner delivery pipe, the valve needles having a needle tip portion and a needle root portion, the needle tip portion being used for correspondingly closing the injection hole of the hot runner delivery pipe in a switchable manner; A plurality of drive components are correspondingly arranged on the mounting position of the valve plate, and the drive components include a piston disc, a connecting hole is opened at the center of the piston disc, and the needle root of the valve needle can be rotatably adjusted to drive the valve needle to rise and fall; A cover plate is arranged on the valve plate, and a plurality of alignment grooves are provided on the inner surface of the cover plate for positioning the drive assembly. A through hole is provided at the center of the alignment groove, and the through hole is aligned with the adjustment end surface of the needle root. A gap is formed between the valve plate and the cover plate for arranging an external drive pipeline, and the external drive pipeline is connected to the drive assembly.

[0012] By adopting the above basic device technical solution, it is possible to adjust the relative length between the valve needle tip and the piston disc of the drive assembly through the perforation on the cover plate without disassembling the mold, solving the problem of loose injection holes caused by valve needle tip loss, and improving the durability and stability of the hot runner system. In addition, the porous frame shape and installation position design of the valve plate make the layout of the hot runner delivery pipe reasonable, enhancing the integrity and sealing performance of the hot runner system.

[0013] In a preferred example, the present invention can be further configured as follows: the adjustment end face has a first tool hole, the connecting hole of the piston disk is a threaded hole, the integrated device also includes a blocking member, which is arranged in the connecting hole of the piston disk, and the blocking member has a second tool hole aligned with the through hole, and the second tool hole is smaller than the connecting hole and larger than the first tool hole.

[0014] By adopting the above-mentioned preferred technical features, the second tool hole of the blocking member arranged in the connecting hole of the piston disk is smaller than the connecting hole of the piston disk and larger than the first tool hole of the adjustment end face of the valve needle. It is possible to quickly adjust the position of the blocking member to the second tool hole and quickly adjust the relative length distance between the valve needle tip and the piston disk of the drive assembly to the first tool hole through the perforation of the cover plate without disassembling the mold, thereby solving the problem of the injection hole not being able to be closed tightly due to the wear of the valve needle tip and improving the reliability and maintenance convenience of the hot runner system.

[0015] In a preferred example, the present invention can be further configured as follows: the valve needle includes a needle body and a C fastener, the needle body has a neck with a reduced diameter at the needle root, the C fastener is fastened to the neck, the side wall of the C fastener has an external thread, which is screwed to the connecting hole of the piston disk, the C fastener can rotate relative to the needle body of the valve needle, and the adjustment end face is located on the outer surface of the C fastener.

[0016] By adopting the above-mentioned preferred technical features and utilizing the setting of the C fastener, the C fastener can rotate relative to the needle body of the valve needle, making it easier to adjust the lifting and lowering position of the valve needle, so that the connection between the needle body of the valve needle and the drive assembly is limited to an axial connection, and the extension length of the valve needle can be conveniently adjusted, thereby enhancing the reliability and maintenance convenience of the hot runner system mold.

[0017] In a preferred example, the present invention can be further configured as follows: the blocking member has an external thread, which is screwed to the connecting hole of the piston disc, and the blocking member is tightly attached to the C fastener.

[0018] By adopting the above-mentioned preferred technical features, the blocking member can be screwed to the connecting hole of the piston disc and closely attached to the C fastener by using the external thread of the blocking member. When the position of the blocking member is quickly adjusted through the perforation on the cover plate, the minimum length distance of the needle tip of the valve needle relative to the piston disc of the driving assembly can be confirmed; if the blocking member is closely attached to the C fastener, the C fastener can be rotated and deepened to open the gap with the blocking member, and then the blocking member can be rotated and deepened, which completely avoids the problem of the needle body of the valve needle retracting by itself and causing the injection hole to not close tightly, and improves the reliability and maintenance convenience of the hot runner system. In addition, the structure of the blocking member closely attached to the C fastener enhances the stability of the axial connection of the valve needle, reduces failures caused by the looseness of the valve needle body, and further improves the stability and durability of the hot runner system.

[0019] In a preferred example, the present invention can be further configured as follows: an identification line is provided on the outer surface of the blocking member or the adjustment end face of the valve needle, which is exposed through the perforation of the cover plate and is used to visually display the adjustment position of the valve needle.

[0020] By adopting the above-mentioned preferred technical features, an identification mark can be set on the outer surface of the blocking member or / and the adjustment end face of the valve needle, and the identification mark is exposed in the perforation of the cover plate to visually display the adjustment position of the valve needle in the hot runner delivery pipe. When the identification mark is located on the adjustment end face of the valve needle, the actual position of the valve needle in the hot runner delivery pipe is displayed; when the identification mark is located on the outer surface of the blocking member, the highest retracted position of the valve needle in the hot runner delivery pipe is displayed. This design makes it easy for the operator to observe and confirm the position of the valve needle, and quickly confirm the relative length distance between the internal valve needle tip and the piston disc of the drive assembly without disassembling the mold.

[0021] In a preferred example, the present invention can be further configured as follows: the diameter of the perforation of the cover plate is simultaneously larger than the outer diameter of the blocking member, the outer diameter of the C fastener and the outer diameter of the needle body of the valve needle, and an airtight contact is formed between the upper surface of the drive cylinder of the drive assembly and the bottom of the alignment groove of the cover plate.

[0022] By adopting the above-mentioned preferred technical features, it is possible to replace the blocking member, C fastener and the needle body of the valve needle through the perforation on the cover plate without disassembling the mold, and then replace the new valve needle. This is suitable for occasions where the needle tip of the valve needle is excessively worn and cannot be adjusted. The polluted dust or oil formed in the process of replacing the valve needle cannot enter the gap between the valve plate and the cover plate, thereby ensuring the cleanliness and reliability of the hot runner system. In addition, the perforation diameter of the cover plate is larger than the outer diameter of the blocking member, C fastener and the needle body of the valve needle, which facilitates the quick and convenient replacement of the valve needle and improves maintenance efficiency. An airtight contact is formed between the upper surface of the drive cylinder of the drive assembly and the bottom of the alignment groove of the cover plate to prevent external contaminants from entering, further improving the stability and durability of the hot runner system mold.

[0023] The present invention can be further configured in a preferred example as follows: the drive assembly further includes modularly combined: A collecting bowl, mounted on the valve plate, for collecting overflowed plastic; A driving block is arranged on the aggregate bowl, and one side of the driving block is provided with two driving flow ports; The driving cylinder is arranged on the driving block, and the piston disc moves in the driving cylinder.

[0024] By adopting the above-mentioned preferred technical features, the plastic overflowing from the root of the needle can be effectively collected by using the collection bowl in the drive assembly and the blocking of the drive block, thereby preventing the plastic from entering the interior of the drive cylinder and affecting the normal operation of the drive assembly. The two drive flow ports on the drive block are designed to facilitate the circulation of gas or liquid, ensure the stable and free movement of the piston disc, and accurately control the lifting and lowering of the valve needle, thereby realizing the opening and closing of the injection hole of the hot runner delivery pipe. This not only improves the reliability and durability of the system, but also effectively prevents material leakage during the injection molding process, thereby ensuring the injection molding quality.

[0025] In a preferred example, the present invention can be further configured as follows: a plurality of power boxes are provided on one side of the valve plate, the drive flow port is connected to an external drive pipeline, and the external drive pipeline is cross-connected with a switching valve to change the drive connection relationship between the power box and the drive assembly.

[0026] By adopting the above-mentioned preferred technical features, the driving connection relationship between the power box and the driving component can be flexibly adjusted through the external driving pipeline and the switching valve. By using the pipeline switching of the switching valve, the area of ​​the driving component controllable by each power box is adjustable, thereby realizing precise control of the injection hole of the variable hot runner delivery pipe. This not only improves the versatility and maintenance convenience of the hot runner system mold, but also reduces the downtime during the injection molding process, and improves the continuity and efficiency of injection molding production. At the same time, the connection method of the external driving pipeline avoids the need to open a complex driving airway in the valve plate, simplifies the system structure, and reduces the manufacturing and maintenance costs of the hot runner system mold.

[0027] In a preferred example, the present invention can be further configured as follows: a plurality of solenoid valves are provided on the other side of the valve plate for changing the switching path of the switching valve to reorganize the driving connection of the power box to the driving assembly.

[0028] By adopting the above-mentioned preferred technical features, the following effects are achieved: 1. Improve the versatility and maintenance convenience of the hot runner system: By setting multiple solenoid valves on the other side of the valve plate, the switching path of the switching valve can be flexibly changed, and the drive connection of the power box to the drive component can be reorganized. This allows the same hot runner system to adapt to the needs of different injection molds, reducing the frequent adjustment and maintenance work caused by the replacement of injection molds; 2. Reduce downtime during the injection molding process: Due to the presence of the solenoid valve, the drive connection relationship between the power box and the drive component can be changed through simple adjustments without stopping the machine, thereby quickly solving possible drive problems during the injection molding process, quickly stopping the rise of the valve needle that overflows the plastic, and improving the continuity and efficiency of the injection molding production; 3. Simplify the mold structure of the hot runner system and reduce its manufacturing and maintenance costs: The connection method of the external drive pipeline avoids the need to open a complex drive air channel in the valve plate, making the system structure simpler and reducing the manufacturing and maintenance costs of the hot runner system mold; 4. Enhance the reliability and durability of the hot runner system: By flexibly adjusting the drive connection relationship, it can better cope with changes in various injection conditions, improve the reliability and durability of the hot runner system, and reduce the frequency of failures and repairs caused by drive problems.

[0029] The second main purpose of the present invention is achieved through the following technical solutions: An injection molding method is proposed, comprising the following steps: S1. Provide a fully integrated hot runner gas path integrated device that may be combined as described above, wherein the integrated device is installed in an injection molding device; S2, driving the valve needle to rise and fall to execute the opening and closing of the injection hole of the hot runner delivery pipe, and the injection molding material flows out into the mold through the hot runner delivery pipe to form an injection molded product in the mold; S3. When the needle tip of one of the valve needles cannot close the injection hole corresponding to the hot runner delivery pipe, the length distance between the needle tip of one of the valve needles and the piston disk of the drive assembly is individually adjusted through the perforation of the cover plate.

[0030] By adopting the above technical solution, the relative length between the valve needle tip and the piston disc of the drive assembly can be flexibly adjusted without disassembling the mold, thereby solving the problem of loose injection holes caused by valve needle tip loss, reducing downtime during the injection molding process, and improving the continuity and efficiency of injection molding production. At the same time, this method can also extend the service life of the valve needle and enhance the durability and stability of the hot runner system.

[0031] In summary, the present invention includes at least one of the following technical effects that contribute to the prior art: 1. Without disassembling the mold, the relative length between the valve needle tip and the piston disc of the drive assembly can be flexibly adjusted on the back of the device; when the valve needle tip is worn out and the injection hole is not closed tightly, there is no need to disassemble the mold to replace the valve needle, which reduces the downtime of the injection process and makes the injection hole of the valve needle switch type closed hot runner delivery pipe more realistic and reliable; 2. Effectively increase the service life of the valve needle and improve the durability and stability of the hot runner system; 3. The piston disc in the drive assembly is connected to the root of the valve needle through a threaded hole and can be adjusted and fixed through the tool hole on the blocking piece, effectively extending the service life of the valve needle and enhancing the durability and stability of the hot runner system; 4. The collecting bowl included in the drive assembly can collect the plastic overflowing to the root of the valve needle, and under the isolation of the drive block, effectively keep the plastic flow channel and the drive air path isolated, so that the inside of the drive cylinder is clean. At the same time, a collecting arc edge is provided around the bottom of the collecting bowl to facilitate the collection of discharged materials, keep the inside of the drive cylinder clean, and improve the reliability and maintenance convenience of the hot runner system; 5. Solve the technical problem that the high-consumption valve needle cannot close the injection hole of the hot runner conveying pipe tightly without removing the mold to replace the valve needle, so as to facilitate timely maintenance and debugging on the injection molding production line; 6. Compared with the direct processing method, the present invention adopts the external pipeline method, which does not require the opening of a driving airway in the valve plate. By changing the connection mode of the external driving fluid pipe, the connection relationship between the power box and the corresponding driving component can be changed. By using the connection switching of the external driving pipeline, it is easy to find the corresponding control nozzle point during the injection molding production process; 7. The injection hole of the hot runner conveying pipe can be equipped with a leak-proof seal to prevent plastic leakage during the injection process and ensure the injection quality; a sealing ring can be provided on the installation position of the valve plate to enhance the sealing performance of the hot runner system and prevent gas and liquid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A three-dimensional assembly schematic diagram of a fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the exploded view of the components of the fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown; Figure 3 A cross-sectional schematic diagram of a fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown; Figure 4 A three-dimensional schematic diagram of a valve pin of a fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown; Figure 5 The fully integrated hot runner gas path integrated device of the embodiment of the present invention is shown in FIG. Figure 3 A partial enlarged schematic diagram of the middle drive assembly (including part of the valve plate, part of the cover plate and a complete drive assembly); Figure 6 A schematic diagram of a three-dimensional assembly of multiple driving components of a fully integrated hot runner gas path integrated device on a valve plate according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of the exploded view of one of the drive components of the fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown; Figure 8 A schematic cross-sectional view of a driving assembly of a fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown ((A), (B) to (C) are the process from valve needle closing to valve needle opening); Fig. 9 A schematic diagram showing the connection of external drive pipelines of the fully integrated hot runner gas circuit integrated device according to an embodiment of the present invention is shown; Fig.10 Schematic diagrams showing the flow of injection molding methods according to some preferred embodiments of the present invention.

[0033] 1. Injection mold; 2. Injection molded product; 10. Valve plate; 11. Mounting position; 20. Valve needle; 21. Needle tip; 22. Needle root; 22a. Adjustment end face; 231. First tool hole; 24. Neck; 25. C fastener; 30. Drive assembly; 31. Piston plate; 311. Connecting hole; 32. Collecting bowl; 33. Drive block; 33a. Drive flow port; 34. Drive cylinder; 35. Mounting plate; 40. Cover plate; 41. Alignment groove; 411. Perforation; 50. Hot runner delivery pipe; 51. Injection hole; 60. Blocking piece; 611. Second tool hole; 70. External drive pipeline; 71. Switching valve; 72. Solenoid valve; 80. Power supply box; 91. Limit plate; 92. Limit strip; 93. Spacer frame; 94. Pad; 95. Ejector plate; 96. Pad. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments for understanding the inventive concept of the present invention, and cannot represent all the embodiments, nor are they interpreted as the only embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field on the premise of understanding the inventive concept of the present invention are within the scope of protection of the present invention.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indications will also change accordingly. In order to facilitate the understanding of the technical solution of the present invention, the fully integrated hot runner gas circuit integrated device of the present invention is further described and explained below, but it is not limited to the scope of protection of the present invention.

[0036] The "fully integrated" hot runner gas circuit integrated device proposed in the present invention means that the integrated device has integrity and is constructed as a complete unit, integrating various components such as the hot runner, mechanical drive components, and electric drive power supply box to form a compact and coordinated whole (such as Figure 1 In the hot runner system, the hot nozzle and the runner plate are tightly connected together through threads or other means to form an inseparable whole, which is hoisted and combined with the injection molding equipment to reduce the possibility of plastic leakage and improve the sealing and reliability of the system.

[0037] The "integration" of the fully integrated hot runner gas circuit device refers to the integration of multiple scattered parts or elements into a coordinated and unified whole. In the hot runner gas circuit integrated device, all components involved in the hot runner system, including the drive circuit, drive gas circuit, injection flow channel, heating system, etc., are integrated into the hot runner system device (such as Figure 1 and Figure 2 The integrated system includes multiple power boxes on one side of the valve plate, multiple drive components arranged in an array between the valve plate and the cover plate, and multiple hot runner delivery pipes on the inner surface of the valve plate, making the entire system more compact, efficient, and easy to install and maintain. The advantages of an integrated system are improved efficiency, enhanced stability, improved overall performance, and better synergy.

[0038] First, a fully integrated hot runner gas path integrated device in an embodiment of the present invention is a universal hot runner system, which can be selected with any of the upper molds (or side molds with injection ports) of a variety of molds for manufacturing different injection products, and the two are combined into an upper film as a whole, and then installed in the injection molding equipment. The injection molding equipment drives the upper film as a whole to combine with the lower mold of the mold, and injects glue into the mold to form an injection molded product. The injection molded product has a complex shape, such as the casing of a television or monitor, and the injection molded product cannot usually be formed by a single point glue inlet. Therefore, the same injection molding equipment can prepare a variety of injection molded products, and the integrated device does not need to repeatedly open the mold to save the mold cost of the hot runner system.

[0039] Figure 1 A three-dimensional assembly schematic diagram of a fully integrated hot runner gas path integrated device according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of the exploded components of the integrated device is shown. Figure 3 A cross-sectional schematic diagram of the integrated device is shown. Figure 4 A three-dimensional schematic diagram of a valve needle used in the integrated device is shown. Figure 5 The integrated device is shown in Figure 3 A partial enlarged schematic diagram of the drive assembly as a key component (including part of the valve plate, part of the cover plate and a complete drive assembly), Figure 5 The integrated device is shown in Figure 3 A partial enlarged schematic diagram of the drive assembly used in (including part of the valve plate, part of the cover plate and a complete drive assembly); Figure 6 A three-dimensional assembly diagram of the driving component is shown. Figure 7 A schematic diagram of the component decomposition of the drive component is shown. Figure 8 A schematic cross-sectional view of the drive assembly is shown. Fig. 9A connection diagram of external drive pipelines connected to multiple drive components in the integrated device is shown. The drawings include common parts of multiple embodiments, and the parts with differences or distinctions are described in text or presented in comparison with the drawings. Based on the characteristics of the industry and the essence of the technology, technicians familiar with the field should correctly and reasonably understand and judge whether the individual technical features described below or any combination of them can represent the same embodiment, or whether multiple technical features with mutually exclusive technical essences can represent different variant embodiments respectively.

[0040] Reference Figure 1 and Figure 2 , is a fully integrated hot runner gas circuit integrated device disclosed in an embodiment of the present invention, mainly comprising: a valve plate 10, a plurality of valve needles 20 that can be lifted and moved, a plurality of drive components 30 and a cover plate 40. The key component is the drive component 30. The function of the valve plate 10 is to support and fix a plurality of vertical hot runner delivery pipes 50 at the bottom, and to install and combine the drive component 30 at the top; the main function of the valve needle 20 is to open and close the injection hole 51 of the hot runner delivery pipe 50 to inject plastic into the mold cavity of the product mold; the function of the drive component 30 is to drive the axial movement of the valve needle 20; the function of the cover plate 40 is to limit and fix the drive component 30, and serve as a support plate for installing the integrated device in the injection molding equipment; the gap between the valve plate 10 and the cover plate 40 serves as the installation space for the drive component 30 and the external drive pipeline 70 and external wires. The external drive pipeline 70 can be an external gas pipeline or an external oil pipeline.

[0041] Reference Figure 2 , Figure 3 , Figure 6 and Fig. 9 The valve plate 10 has a porous frame shape and is generally made of a rigid metal material. For example, the valve plate 10 is made of a high-strength aluminum alloy material with good corrosion resistance and deformation resistance. The upper surface of the valve plate 10 has a plurality of mounting positions 11 for mounting the drive assembly 30; a plurality of vertical hot runner delivery pipes 50 are arranged below the valve plate 10, and the far end of the hot runner delivery pipe 50 has an injection hole 51. Figure 2 and Figure 6 Typically, an injection channel is provided in the valve plate 10 to connect to the hot runner delivery pipe 50. Figure 2 and Figure 3, the valve plate 10 is fixed on the limit plate 91 in a limiting manner to obtain the limitation in the Z-axis direction; the limit strip 92 is connected to the limit plate 91, and the valve plate 10 is fixed between the limit strips 92 on both sides of the Y direction to obtain the limitation in the X-direction of the XY plane; combined with the fixation of the power box 80 on the X-side of the valve plate 10, the valve plate 10 is limited in the Y-direction on the limit plate 91. Therefore, the valve plate 10 is connected to the drive assembly 30 installed above it and the hot runner delivery pipe 50 installed below it as a whole, and is detachable relative to other components of the hot runner system mold. The porous frame shape of the valve plate 10 has the effect of reducing weight, which is convenient for lifting. In addition, the function of the hot runner delivery pipe 50 is to provide the injection molding rubber material for inflow and heating, and extrude it into the mold cavity of the injection mold 1 through the injection hole 51 ( Figure 1 , Figure 2 Only the upper mold of the injection mold 1 is shown), and an integrated complex-shaped injection molded product 2 can be formed under multi-tube injection molding, such as TV housings, display frame shells, drone housings and other complex-shaped electronic product parts, which are formed by one-time injection molding without the need for splicing and assembly. The hot runner delivery pipe 50 is usually made of stainless steel or copper alloy materials, and has durability and corrosion resistance at high temperatures. In the example, the inner diameter of the hot runner delivery pipe 50 is about 10 to 45 mm, the outer diameter is 15 to 50 mm, and the length is 300 to 900 mm to ensure sufficient injection flow and stability.

[0042] Reference Figure 3 , Figure 4 and Figure 5 A plurality of valve needles 20 that can be lifted and moved are correspondingly arranged in the hot runner delivery pipe 50, and the valve needle 20 has a needle tip portion 21 and a needle root portion 22, and the needle tip portion 21 is used for opening and closing the injection hole 51 (such as Figure 3 As shown). The valve needle 20 is made of high-strength alloy steel material, which has good wear resistance and temperature resistance. The diameter of the valve needle 20 is 5 to 8 mm, and the length of the valve needle 20 is slightly longer than the length of the hot runner delivery pipe 50. The valve needle 20 can be well connected with the drive assembly 30 and operate stably.

[0043] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6, a plurality of driving components 30 are correspondingly arranged on the mounting position 11 of the valve plate 10, and the driving component 30 includes a piston disc 31, and a connecting hole 311 is opened in the center of the piston disc 31, which can be rotatably adjusted to connect the needle root 22 of the valve needle 20, and is used to drive the lifting of the valve needle 20. The connecting hole 311 is arranged in the sleeve of the piston disc 31. Specifically, the connecting hole 311 is a screw hole with a diameter of 6 to 18 mm and a pitch of 1.0 to 3.0 mm, which ensures that the piston disc 31 is stably connected to the needle root 22 of the valve needle 20. The diameter of the piston disc 31 is 50 to 100 mm, and the thickness is 10 to 30 mm, which ensures sufficient driving force and stability.

[0044] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 The cover plate 40 is disposed on the valve plate 10. Generally speaking, the cover plate 40 is made of high-strength rigid material with good corrosion resistance and impact resistance. The inner surface of the cover plate 40 is provided with a plurality of alignment grooves 41 for positioning the drive assembly 30. The center of the alignment groove 41 is provided with a through hole 411, which is aligned with the adjustment end surface 22a of the needle root 22 (such as Figure 5 As shown); the length and width of the alignment groove 41 of the cover plate 40 are 60 to 120 mm, and the depth is 10 to 50 mm, ensuring the precise positioning of the drive assembly 30. The diameter of the through hole 411 is 6 to 18 mm, ensuring that the tool can be smoothly inserted through the through hole 411 to adjust the downward extension length of the valve needle 20 relative to the piston disc 31.

[0045] Also, see Figures 1 to 3 The spacer frame 93 can be used to separate the limit plate 91 and the cover plate 40, and a gap for arranging the external drive pipeline 70 is formed between the valve plate 10 and the cover plate 40; see Fig. 9 The external drive pipeline 70 is connected to the drive assembly 30. The external drive pipeline 70 provides a pressure difference between the upper and lower parts of the piston plate 31, so that the piston plate 31 moves up and down. Figures 1 to 3 A backing plate 94 and an ejector plate 95 are also installed below the limit plate 91, and a cushion block 96 is used to isolate the injection mold 1 below the hot runner system mold. The backing plate 94 is used to enhance the structural strength of the limit plate 91. The ejector plate 95 is separated from the injection mold 1 by the cushion block 96 to provide a heating space for the hot runner delivery pipe 50. The hot runner delivery pipe 50 passes through the limit plate 91, the backing plate 94, the ejector plate 95 and the injection mold 1 to prepare the injection molded product 2.

[0046] Therefore, without disassembling the mold, it is not necessary to disassemble the valve plate 10, the drive assembly 30 and the hot runner delivery pipe 50 from the hot runner system mold. The relative length distance between the needle tip 21 of the valve needle 20 and the piston disc 31 of the drive assembly 30 is adjusted through the perforation 411 on the cover plate 40, thereby solving the problem of the injection hole 51 not being closed tightly due to the needle tip loss of the valve needle 20, and improving the durability and stability of the hot runner system. In addition, the porous frame shape of the valve plate 10 and the design of the mounting position 11 make the layout of the hot runner delivery pipe 50 reasonable, and enhance the integrity and sealing performance of the hot runner system mold.

[0047] See also Figure 5 and Figure 7 In a preferred example, the adjustment end face 22a has a first tool hole 231, and the connection hole 311 of the piston disc 31 is a threaded hole. The integrated device also includes a blocking member 60, which is arranged in the connection hole 311 of the piston disc 31. The blocking member 60 has a second tool hole 611 aligned with the through hole 411, which is smaller than the connection hole 311 and larger than the first tool hole 231. The second tool hole 611 and the first tool hole 231 can be hexagonal holes or octagonal holes of different sizes. Therefore, it is achieved that the position of the blocking member 60 is quickly adjusted to the second tool hole 611 through the through hole 411 of the cover plate 40, and the relative length distance between the needle tip 21 of the valve needle 20 and the piston disc 31 of the drive assembly 30 is quickly adjusted to the first tool hole 231 without disassembling the mold, so as to solve the problem that the injection hole 51 cannot be closed tightly due to the wear of the needle tip 21 of the valve needle 20, and improve the reliability and maintenance convenience of the hot runner system mold.

[0048] See also Figure 4 and Figure 7 In a preferred example, the valve needle 20 includes a needle body and a C fastener 25, and the needle body of the valve needle 20 has a neck 24 with a reduced diameter at the needle root 22. Figure 5 and Figure 7, the C fastener 25 is fastened to the neck 24 of the needle body, the side wall of the C fastener 25 has an external thread, which is screwed to the connection hole 311 of the piston disc 31, and the C fastener 25 can rotate relative to the needle body of the valve needle 20, and the adjustment end face 22a is located on the outer surface of the C fastener 25. Since the C fastener 25 can rotate relative to the needle body of the valve needle 20, it is easier to adjust the lifting position of the valve needle 20, so that the connection between the needle body of the valve needle 20 and the drive assembly 30 is limited to the axial connection, the valve needle 20 does not rotate, and the extension length of the valve needle 20 can be conveniently adjusted, thereby enhancing the reliability and maintenance convenience of the hot runner system mold. Specifically, the C fastener 25 is made of high-strength rigid material and has good self-lubrication and wear resistance. The outer surface of the C fastener 25 is provided with an external thread, and the diameter of the C fastener 25 is consistent with the diameter of the connection hole 311 of the piston disc 31, ensuring stable connection with the piston disc 31. The C fastener 25 has an open slot on the side thereof, so that the base portion 22 of the valve needle 20 can be fastened therein and the valve needle 20 can be allowed to rotate.

[0049] See also Figure 5 , Figure 6 and Figure 8In a preferred example, the blocking member 60 has an external thread, which is screwed to the connecting hole 311 of the piston disk 31, and the blocking member 60 is tightly attached to the C fastener 25. The blocking member 60 is made of high-strength rigid material and has good self-lubrication and wear resistance. The diameter of the blocking member 60 is consistent with the connecting hole 311 of the piston disk 31, and the length of the blocking member 60 is 20 to 50 mm, ensuring a stable connection with the connecting hole 311 of the piston disk 31. The outer surface of the lower body of the blocking member 60 is provided with an external thread, which is connected to the connecting hole 311 of the piston disk 31. The diameter of the second tool hole is 4 to 15 mm, ensuring that the tool can be smoothly inserted for adjustment. The blocking member 60 is screwed to the connection hole 311 of the piston disc 31 and is closely attached to the C fastener 25. When the position of the blocking member 60 is quickly adjusted through the through hole 411 on the cover plate 40, the minimum length distance of the needle tip 21 of the valve needle 20 relative to the piston disc 31 of the drive assembly 30 can be confirmed. If the blocking member 60 is closely attached to the C fastener 25, the C fastener 25 can be rotated to deepen the gap with the blocking member 60, and then the blocking member 60 can be rotated to deepen, so as to completely avoid the problem that the needle body of the valve needle 20 retracts by itself and causes the injection hole 51 to not close tightly, and improve the reliability and maintenance convenience of the hot runner system. In addition, the structure of the blocking member 60 closely attached to the C fastener 25 enhances the stability of the axial connection of the valve needle 20, reduces the failure caused by the looseness of the needle body of the valve needle 20, and further improves the stability and durability of the hot runner system mold. In a preferred example, the blocking member 60 can also guide the central hole of the outer shell of the driving assembly 30, and the central hole of the outer shell is specifically located at the driving cylinder body 34 ( Figure 7 As shown); the blocking member 60 is conducive to the axial movement of the piston disc 31.

[0050] See also Figure 5 and Figure 8In a preferred example, an identification mark is provided on the outer surface of the blocking member 60 or / and the adjustment end surface 22a of the needle root 22 of the valve needle 20, which is exposed in the through hole 411 of the cover plate 40, and is used to visually display the adjustment position of the valve needle 20 in the hot runner delivery pipe 50. When the identification mark is located on the adjustment end surface 22a of the valve needle 20, the actual position of the valve needle 20 in the hot runner delivery pipe 50 is displayed; when the identification mark is located on the outer surface of the blocking member 60, the highest retracted position of the valve needle 20 in the hot runner delivery pipe 50 is displayed. This design facilitates the operator to observe and confirm the position of the valve needle 20, and quickly confirm the relative length distance between the needle tip 21 of the internal valve needle 20 and the piston disc 31 of the drive assembly 30 without disassembling the mold. Specifically, the identification mark is made by laser engraving technology, with a width of 0.5 mm and a spacing of 2 mm to ensure clear visibility. The color of the marking line can be red, which forms a sharp contrast with the background color of the cover plate 40 to facilitate observation. Figure 5 The through hole 411 of the cover plate 40 is not only used as a valve needle length adjustment hole and an observation window hole, but also as a valve needle replacement hole. In terms of structure, the diameter of the through hole 411 of the cover plate 40 is larger than the outer diameter of the blocking member 60, the outer diameter of the C fastener 25, and the outer diameter of the needle body of the valve needle 20, and the upper surface of the driving cylinder 34 of the driving assembly 30 forms an airtight contact with the bottom of the alignment groove 41 of the cover plate 40. Figure 1 Without disassembling the mold, the blocking member 60, the C fastener 25 and the needle body of the valve needle 20 can be removed through the through hole 411 of the cover plate 40, and then replaced with a new valve needle 20. This is suitable for situations where the needle tip 21 of the valve needle 20 is excessively worn and cannot be adjusted. The contaminated dust or oil formed in the process of replacing the valve needle 20 cannot enter the gap between the valve plate 10 and the cover plate 40.

[0051] See also Figure 5 and Figure 7 In a preferred example, in addition to the piston plate 31, the driving assembly 30 also includes a modularized collection bowl 32, a driving block 33 and a driving cylinder 34. The collection bowl 32 is mounted on the valve plate 10 to collect the overflowed plastic; the driving block 33 is disposed on the collection bowl 32, and one side of the driving block 33 is provided with two driving flow ports 33a (such as Figure 8As shown in the figure), they are connected to the upper and lower spaces of the piston disc 31 in the driving cylinder 34; the driving cylinder 34 is arranged on the driving block 33, and the piston disc 31 moves in the driving cylinder 34. The driving flow port 33a is located in the gap between the valve plate 10 and the cover plate 40 to connect the external driving pipeline 70, so as to provide the fluid pressure difference for the lifting and lowering movement of the piston disc 31. Figure 5 , Figure 6 and Figure 8 Specifically, the collecting bowl 32 can be combined with the mounting position 11 of the valve plate 10 through the mounting plate 35 at the bottom of the collecting bowl 32. Specifically, the collecting bowl 32 and the driving block 33 are made of high-strength rigid materials with good corrosion resistance and impact resistance. The depth of the collecting bowl 32 is about 20 to 50 mm, ensuring that the overflowed plastic can be effectively collected. The bottom of the collecting bowl 32 is provided with a collecting arc edge to facilitate the collection and discharge of materials. The driving block 33 can cover the opening of the collecting bowl 32. The combination of the collecting bowl 32 and the driving block 33 can keep the interior of the driving cylinder 34 clean. The interior of the driving cylinder 34 can be provided with a guide groove to ensure the smooth up and down movement of the piston disc 31.

[0052] Therefore, the collection of the collecting bowl 32 in the driving assembly 30 and the blocking of the driving block 33 can effectively collect the plastic overflowing to the needle root 22, preventing the plastic from entering the interior of the driving cylinder 34 and affecting the normal operation of the driving assembly 30. The two driving flow ports 33a on the driving block 33 are designed to facilitate the circulation of gas or liquid, ensure the stable and free movement of the piston disc 31, and accurately control the lifting and lowering of the valve needle 20, thereby realizing the opening and closing of the injection hole 51 of the hot runner delivery pipe 50. This not only improves the reliability and durability of the system, but also effectively prevents material leakage during the injection molding process, ensuring the injection molding quality.

[0053] See also Fig. 9 , see also Figure 1 and Figure 2 In a preferred example, a plurality of power boxes 80 are disposed on one side of the valve plate 10, and the drive flow port 33a is connected to an external drive pipeline 70, and the external drive pipeline 70 is staggeredly connected to a switching valve 71 to change the drive connection relationship between the power box 80 and the drive assembly 30. The external drive pipeline 70 is outside, which means that the drive pipeline is not disposed inside the valve plate 10. The external drive pipeline 70 can be a gas pipeline or an oil pressure pipeline. One end of the external drive pipeline 70 is connected to the drive flow port 33a (visible in FIG. 1 ) of the drive assembly 30 at the drive block 33. Figure 8). Therefore, the distribution area of ​​the drive assembly 30 that can be controlled by each power box 80 is adjustable, so as to realize the precise control of the injection hole of the variable hot runner delivery pipe. This not only improves the versatility and maintenance convenience of the hot runner system mold, but also reduces the downtime during the injection molding process, and improves the continuity and efficiency of injection molding production. At the same time, the connection method of the external drive pipeline 70 avoids the need to open a complex drive airway in the valve plate 10, simplifies the system structure, and reduces the manufacturing and maintenance costs of the hot runner system mold.

[0054] See also Fig. 9 , see also Figure 1 and Figure 2 In a more preferred example, a plurality of solenoid valves 72 are provided on the other side of the valve plate 10 for changing the switching path of the switching valve 71 to reorganize the driving connection of the power supply box 80 to the driving assembly 30. Therefore, the versatility and maintenance convenience of the hot runner system can be improved. By flexibly changing the switching path of the switching valve 71 by the plurality of solenoid valves 72 provided on the other side of the valve plate, the same hot runner system can adapt to the needs of different injection molds, reducing the frequent adjustment and maintenance work caused by the replacement of injection molds. Therefore, the power supply box 80 on one side of the valve plate 10 plays the role of block-driven switch of the driving assembly 30, and the solenoid valve 72 on the other side of the valve plate 10 plays the role of regional adjustment of the driving switch. Due to the presence of the solenoid valve 72, the driving connection relationship between the power supply box 80 and the driving assembly 30 can be changed by simple adjustment without stopping the machine, thereby quickly solving the driving problems that may occur during the injection molding process, quickly stopping the valve needle 20 that overflows the plastic from rising, and improving the continuity and efficiency of the injection molding production. The connection mode of the external drive pipeline 70 avoids the need to open a complex drive air channel in the valve plate 10, making the hot runner system structure more concise and reducing the manufacturing and maintenance costs of the hot runner system mold. In addition, by flexibly adjusting the drive connection relationship between the power box 80 and the drive assembly 30 through the solenoid valve 72, it is possible to better cope with changes in various injection molding conditions, improve the reliability and durability of the hot runner system, and reduce the failure and maintenance frequency caused by drive problems.

[0055] In addition, see Fig.10 , Figures 1 to 3 Other embodiments of the present invention also disclose an injection molding method using the above-mentioned fully integrated hot runner and gas path integrated device, including: Step S1, providing a fully integrated hot runner gas path integrated device as described above, wherein the integrated device is installed in an injection molding device; Step S2, driving the valve needle 20 to rise and fall to open and close the injection hole 51 of the hot runner delivery pipe 50, and the injection molding material flows out into the injection mold 1 through the hot runner delivery pipe 50 to form an injection molded product 2 in the mold; Step S3, when the needle tip 21 of one of the valve needles 20 cannot close the injection hole 51 of the hot runner delivery pipe 50, the length distance between the needle tip 21 of one of the valve needles 20 and the piston plate 31 of the drive assembly 30 is individually adjusted through the through hole 411 of the cover plate 40 (such as Figure 5 as shown).

[0056] In the method embodiment of the present invention, the relative length distance between the needle tip 21 of the valve needle 20 and the piston disc 31 of the drive assembly 30 can be flexibly adjusted without disassembling the mold, thereby solving the problem of the injection hole 51 not being tightly closed due to the needle tip loss of the valve needle 20, reducing the downtime during the injection molding process, and improving the continuity and efficiency of the injection molding production. At the same time, this method can also extend the service life of the valve needle 20 and enhance the durability and stability of the hot runner system.

[0057] The embodiments of this specific implementation method are all preferred embodiments for facilitating the understanding or implementation of the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. All equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully integrated hot runner gas path device, characterized in that: include: The valve plate has a porous frame shape, the upper surface of the valve plate has a plurality of mounting positions, a plurality of vertical hot runner delivery pipes are arranged below the valve plate, and the remote ends of the hot runner delivery pipes have injection holes; A plurality of valve needles capable of lifting and moving are correspondingly arranged in the hot runner delivery pipe, the valve needles having a needle tip portion and a needle root portion, the needle tip portion being used for correspondingly closing the injection hole of the hot runner delivery pipe in a switchable manner; A plurality of drive components are correspondingly arranged on the mounting position of the valve plate, and the drive components include a piston disc, a connecting hole is opened at the center of the piston disc, and the needle root of the valve needle can be rotatably adjusted to drive the valve needle to rise and fall; A cover plate is arranged on the valve plate, and a plurality of alignment grooves are provided on the inner surface of the cover plate for positioning the drive assembly. A through hole is provided at the center of the alignment groove, and the through hole is aligned with the adjustment end surface of the needle root. A gap is formed between the valve plate and the cover plate for arranging an external drive pipeline, and the external drive pipeline is connected to the drive assembly.

2. The fully integrated hot runner gas path device according to claim 1, characterized in that: The adjustment end face has a first tool hole, and the connecting hole of the piston disk is a threaded hole. The integrated device also includes a blocking member, which is arranged in the connecting hole of the piston disk. The blocking member has a second tool hole aligned with the through hole, and the second tool hole is smaller than the connecting hole and larger than the first tool hole.

3. The fully integrated hot runner gas path device according to claim 2, characterized in that: The valve needle includes a needle body and a C fastener. The needle body has a neck with a reduced diameter at the needle root. The C fastener is fastened to the neck. The side wall of the C fastener has an external thread, which is screwed to the connecting hole of the piston disk. The C fastener can rotate relative to the needle body of the valve needle, and the adjustment end face is located on the outer surface of the C fastener.

4. The fully integrated hot runner gas path device according to claim 3, characterized in that: The blocking member has an external thread and is screwed to the connecting hole of the piston disc. The blocking member is tightly attached to the C fastener.

5. The fully integrated hot runner gas path device according to claim 4, characterized in that: An identification mark is arranged on the outer surface of the blocking member and / or the adjustment end surface of the valve needle, which is exposed through the perforation of the cover plate and is used to visually display the adjustment position of the valve needle.

6. The fully integrated hot runner gas path device according to claim 3, characterized in that: The diameter of the perforation of the cover plate is larger than the outer diameter of the blocking member, the outer diameter of the C fastener and the outer diameter of the needle body of the valve needle, and an airtight contact is formed between the upper surface of the driving cylinder of the driving assembly and the bottom of the alignment groove of the cover plate.

7. The fully integrated hot runner gas path device according to any one of claims 1 to 6, characterized in that: The drive assembly also includes a modular combination of: A collecting bowl, mounted on the valve plate, for collecting overflowed plastic; A driving block is arranged on the aggregate bowl, and one side of the driving block is provided with two driving flow ports; The driving cylinder is arranged on the driving block, and the piston disc moves in the driving cylinder.

8. The fully integrated hot runner gas path device according to claim 7, characterized in that: A plurality of power supply boxes are arranged on one side of the valve plate, the driving flow port is connected to an external driving pipeline, and the external driving pipeline is staggeredly connected to a switching valve to change the driving connection relationship between the power supply box and the driving component.

9. The fully integrated hot runner gas path device according to claim 8, characterized in that: A plurality of solenoid valves are arranged on the other side of the valve plate for changing the switching path of the switching valve so as to reorganize the driving connection between the power box and the driving assembly.

10. An injection molding method, characterized in that: include: Provide a fully integrated hot runner gas path integrated device as described in any one of claims 1 to 9, the integrated device is installed in an injection molding device; The valve needle is driven to rise and fall to execute the opening and closing of the injection hole of the hot runner delivery pipe, and the injection molding material flows out into the mold through the hot runner delivery pipe to form a product; When the needle tip of one of the valve needles cannot close the injection hole of the hot runner delivery pipe, the length distance between the needle tip of one of the valve needles and the piston disk of the driving assembly is individually adjusted through the perforation of the cover plate.

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