Needle valve driving device arranged on hot runner support and assembling method of needle valve driving device

Abstract

The invention relates to a needle valve driving device in a hot runner system, and discloses a needle valve driving device arranged on a hot runner support and an assembling method of the needle valve driving device. The device comprises a material collecting bowl, a driving cavity, a piston disc and a needle valve adjusting piece, and a shell of the driving cavity rotates in a resistance mode relative to the material collecting bowl so as to adjust routing of a driving flow path on a hot runner support and adjust the tightness of a valve needle. By arranging an adjusting hole, a first buckling groove, a limiting ring groove, an axial limiting rod and other structures, stable assembly of the device and adjustability of the lifting position of the valve needle and routing of the driving flow path are ensured. In particular, the problems that the position of the needle valve adjusting piece is difficult to adjust and the needle valve adjusting piece moves and displaces under the rotation characteristic of the driving cavity can be solved through the combination of a first positioning hole, a positioning notch, a plugging piece and a tensioning piece. The structural design of the adjustable needle valve driving device in the hot runner system is optimized, the assembling flexibility and reliability are improved, and meanwhile, the height of the valve needle is conveniently and accurately adjusted, and driving flow path wiring is maintained.

Description

[0001] This invention is a divisional application, and the basis of the divisional application is the invention application with application number 202510624187.0, application date May 15, 2025, and invention name "A hot runner adjustable needle valve drive device and its assembly method". Technical Field

[0002] 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 needle valve drive device provided on a hot runner bracket and an assembly method thereof. Background Art

[0003] The field of hot runner technology for injection molding machines has developed rapidly in recent years, especially in injection molding switch drives, where the application of pneumatic needle valves has become increasingly widespread. This technology is mainly divided into two types: valve needle length adjustable and non-adjustable. The non-adjustable type of valve needle will cause needle tip wear due to long-term use, which can easily cause problems with not closing tightly. Although the adjustable type of valve needle can overcome the influence of needle tip wear, in actual applications, the movable deviation of the valve needle relative to the piston disc is significant, especially in high-frequency vibration and high-temperature environments. This deviation will lead to reduced sealing and reduced system stability. In addition, with the increase in the complexity of the injection molding process, multiple adjustable pneumatic needle valves are usually integrated on a hot runner bracket, which makes the number of drive flow paths large and the wiring complex, which not only increases the difficulty of maintenance, but also easily causes the flow path to break due to external force during the adjustment process.

[0004] Patent publication number CN101314253A discloses a hot runner device for injection molding, comprising a manifold with a flow channel for resin flow required for injection molding, a needle-valve nozzle for injecting resin from the flow channel into the mold's gate, a valve needle for opening and closing the gate, a piston and cylinder for driving the valve needle, a position adjustment mechanism for moving the cylinder relative to the manifold to adjust the position of the valve needle, and a nozzle adjustment mechanism for applying an adjustment force to the needle-valve nozzle in the direction of the manifold's cross-section protruding toward the needle-valve nozzle. This prior art utilizes a nozzle adjustment mechanism for longitudinally adjusting the valve needle position and a position adjustment mechanism for transversely adjusting the gate position to enable adjustment of the valve needle length and gate position while the mold is installed, thus preventing the formation of gate flash. In related art, valve needle position adjustment is achieved solely through an adjusting screw, which, as the drive flow path layout becomes more complex, fails to address flow path interference. Furthermore, the adjustable valve needle may be subject to movement and deflection during the injection molding process due to mechanical vibration after the valve needle position is adjusted.

[0005] The applicant disclosed a needle valve hot runner system in invention patent publication number CN207772313U, which includes a valve needle, a hot runner plate, a drive device and a heater. The valve needle outer shell is provided with a valve needle bushing that can be adjusted along the valve needle axis. The hot runner plate is provided with a conical guide hole that interferes with the valve needle bushing. Through the above arrangement, during the use of the hot runner, the back-and-forth movement of the valve needle and the valve needle bushing generate friction, causing the gap between the valve needle and the bushing to increase. The valve needle bushing is adjusted to move to a position with a smaller diameter of the guide hole. The valve needle bushing is deformed under the extrusion of the guide hole, reducing the gap between the valve needle bushing and the valve needle, thereby ensuring the sealing performance at the valve needle bushing. This method can be used to adjust the gap between the valve needle and the bushing without disassembling the mold. In the related art of adjustable valve needle drive devices, there is a common problem of insufficient dynamic stability of a single locking structure.

[0006] Therefore, those skilled in the art are aware that there are existing solutions for the drive chamber in the prior art for adjusting the lifting position of the valve needle. For example, a threaded adjustment locking structure is used to fix the valve needle position, but a single locking structure lacks dynamic stability and is prone to loosening under vibration or pressure fluctuations, which means that the adjustable vibration resistance is insufficient; even if a one-way mechanical locking mechanism (such as a buckle or pin) is used, although it can limit the displacement of the valve needle to a certain extent, it cannot achieve two-way restriction, especially in high temperature environments, and is prone to failure; and the non-adjustable needle valve drive device that rigidly connects the drive chamber and the aggregate bowl, although it can provide a certain degree of stability, requires the mold to be disassembled when adjusting the valve needle, which has low maintenance efficiency and is prone to damage to the flow path. The adjustable and non-adjustable structures are not technically compatible.

[0007] On the one hand, the adjustable needle valve drive device is difficult to maintain stability after adjustment, affecting the sealing performance during the injection molding process. On the other hand, the layout of the drive flow path is complex, and it is very easy for external forces to cause flow path breakage when adjusting the valve needle. At the same time, traditional locking mechanisms are difficult to adapt to high temperature and high-frequency vibration environments, resulting in poor overall system reliability and high maintenance costs. Therefore, how to design a technical solution that can both stably lock the adjustable valve needle position and optimize the drive flow path layout has become a key issue that needs to be solved urgently. Summary of the Invention

[0008] A main purpose of the present invention is to overcome the above technical problems and provide a needle valve driving device arranged on a hot runner bracket.

[0009] The second main purpose of the present invention is to provide a needle valve drive device arranged on a hot runner bracket. The main improvement is that the needle valve adjustment part, the sealing part and the tensioning part can be installed or adjusted with the positioning kit of the same set of valve needle adjustment tools. The valve needle with adjusted height obtains a double locking mechanism. The valve needle is not prone to activity deviation after adjustment, which solves the problem of weak vibration resistance of the adjustable valve needle.

[0010] The third main purpose of the present invention is to provide an assembly method of a needle valve drive device arranged on a hot runner bracket, which is used to manufacture a needle valve drive device in which the valve needle height and the driving flow path routing are adjustable and the valve needle is not subject to vibration and activity deviation after adjustment.

[0011] The main purpose of the present invention is achieved through the following technical solutions: A needle valve driving device provided on a hot runner support is proposed, comprising: The collecting bowl is fixed on the hot runner bracket to collect the overflowed plastic; A driving chamber is provided on the collecting bowl, wherein the driving chamber comprises a shell having a bottom opening and a bottom plate coupled to the bottom opening; A piston disc is accommodated in the housing, and the piston disc has an upper sleeve and a lower sleeve located at the axis, and an adjustment hole passing through the upper sleeve and the lower sleeve; A needle valve adjusting member, adjustably mounted in the adjusting hole of the piston disc, the needle valve adjusting member being used to engage one end of the valve needle; Wherein, the shell of the driving chamber rotates with resistance relative to the aggregate bowl.

[0012] By adopting the technical solution of the above-mentioned basic device, the shell of the drive chamber presents resistance to rotation relative to the aggregate bowl. When the aggregate bowl is fixedly coupled to the hot runner bracket, the drive chamber presents resistance to rotation, so as to adjust the routing of the drive flow path on the hot runner bracket, reduce the mutual interference between the drive flow paths, and optimize the overall layout of the drive flow path on the hot runner bracket. Because the shell of the drive chamber presents resistance to rotation relative to the aggregate bowl, the routing of the drive flow path can be flexibly adjusted on the hot runner bracket, effectively reducing the risk of mutual interference between the drive flow paths. At the same time, this valve needle adjustable drive device provides convenience for subsequent adjustment and maintenance, which not only avoids the problem of disassembling the mold when the traditional non-adjustable valve needle needs to be adjusted under a rigid connection structure, but also solves the problem of low efficiency and inconvenient operation of valve needle height adjustment and position maintenance due to the interference of valve needle vibration offset and drive flow path routing in the traditional adjustable valve needle drive device.

[0013] In a preferred example, the present invention can be further configured as follows: the aggregate bowl has a bowl mouth for arranging the drive chamber on the top, and the aggregate bowl is provided with a limiting ring groove on the outside of the bowl mouth; the inner side of the shell is provided with a first buckle groove for buckling the edge of the bottom plate, and the side wall of the drive chamber is provided with a plurality of lock holes between the first buckle groove and the bottom opening; the hot runner adjustable needle valve drive device also includes: a plurality of axial limiting rods, which are connected in the lock hole, and one end of the axial limiting rod protrudes from the lock hole and stops at the limiting ring groove to prevent the aggregate bowl from falling out.

[0014] By adopting the above-mentioned preferred technical features, multiple axial limiting rods connected to the locking holes, with one end protruding from the locking holes and resting in the limiting ring groove, can achieve resisted rotation of the drive chamber housing relative to the collection bowl and prevent separation of the drive chamber housing and the collection bowl, thereby optimizing the drive flow path routing and reducing the risk of routing interference. This structure is a specific example of achieving "resisted rotation" and significantly improves the structural stability and maintenance ease of the device. In variations, other known mechanical structures can also be combined to achieve the "resisted rotation" feature.

[0015] In a preferred example, the present invention can be further configured as follows: an air expansion groove is also opened on the inner side of the shell, the bottom plate is arranged between the air expansion groove and the second buckle groove, the second buckle groove is located between the first buckle groove and the lock hole, and the hot runner adjustable needle valve drive device also includes: an elastic inner ring, which is buckled into the second buckle groove to prevent the bottom plate from falling out, and the bowl mouth touches the elastic inner ring.

[0016] By adopting the above-mentioned preferred technical features, the elastic inner ring can be buckled into the second buckle groove. At the same time, the bottom plate can be effectively prevented from falling out of the shell. The mouth of the aggregate bowl touches the elastic inner ring to ensure the stability of the drive chamber itself, so that the drive chamber can be set above the aggregate bowl.

[0017] In a preferred example, the present invention may be further configured as follows: a plurality of driving flow path interfaces are opened on the top surface of the shell; or a plurality of driving flow path interfaces are opened on the side surface of the shell through the bottom plate.

[0018] By adopting the above-mentioned preferred technical features, the drive flow path interface can be positioned on the top surface or side of the bottom plate of the drive cavity housing according to actual needs to optimize the layout of the drive flow path, effectively reduce mutual interference between the drive flow paths, and improve the space utilization and assembly convenience of the device. Specifically, the top surface interface is conducive to vertical flow path connection, while the side interface is more suitable for horizontal layout adjustment, thereby adapting to the design requirements of hot runner molds for different injection molding machines.

[0019] In a preferred example, the present invention can be further configured as follows: a first positioning hole is provided on the upper surface of the shell, and a positioning notch is provided on the upper sleeve. Under the multiple positioning of the valve needle adjustment tool, the technical difficulty that the shell of the driving chamber with a resistance rotation characteristic cannot adjust the relative position of the needle valve adjustment part connected to the valve needle in the adjustment hole of the piston disk is solved.

[0020] By adopting the above-mentioned preferred technical features, the first positioning hole provided on the upper surface of the housing and the positioning notch provided on the sleeve of the piston disc can be used for positioning. The first positioning hole prevents the drive chamber housing from rotating freely, and the positioning notch prevents the piston disc from rotating freely. This effectively solves the problem of the drive chamber housing having a rotation resistance characteristic, while the relative position between the needle valve adjustment member and the piston disc adjustment hole is difficult to accurately adjust. Specifically, the cooperation between the first positioning hole and the positioning notch provides a clear alignment reference during the assembly of the valve needle, ensuring the accuracy of the installation and adjustment of the needle valve adjustment member, thereby improving the assembly efficiency and reliability of the entire needle valve drive device.

[0021] In a preferred example, the present invention may be further configured as follows: a second positioning hole is provided on the lower surface of the base plate.

[0022] By employing the aforementioned preferred technical features, a second positioning hole provided on the bottom surface of the base plate can be positioned in conjunction with the first positioning hole of the housing, effectively sealing the bottom opening of the housing and completing the pre-assembly of the drive chamber and piston disc, which possess a rotation resistance characteristic. When the drive chamber is mounted above the aggregate bowl, the contact between the bottom edge of the base plate and the upper surface of the elastic inner ring increases the resistance to rotation of the drive chamber housing. The periphery of the base plate can generate a hysteresis resistance to asynchronous rotation relative to the drive chamber housing.

[0023] In a preferred embodiment, the present invention may be further configured as follows: the hot runner adjustable needle valve drive device further includes: a blocking member installed in the adjustment hole of the piston disc and used to block the needle valve adjustment member from rising in the adjustment hole; A tensioning member is located in the adjustment hole of the piston disc. The tensioning member passes through the blocking member and is installed on the needle valve adjustment member to limit the descent of the needle valve adjustment member in the adjustment hole.

[0024] By adopting the above-mentioned preferred technical features, utilizing the synergistic effect of the blocking member and the tensioning member, the tensioning member connects the blocking member and the needle valve adjustment member to form an integrated connection structure in the adjustment hole, thereby achieving a dual restriction on the needle valve adjustment member from rising and falling in the adjustment hole. Specifically, the blocking member effectively prevents the needle valve adjustment member from being displaced upward due to external force or vibration, while the tensioning member further restricts its downward movement by passing through the blocking member and connecting to the needle valve adjustment member, thereby ensuring the positional stability of the needle valve adjustment member in the adjustment hole. This double locking mechanism significantly improves the anti-vibration performance of the adjusted valve needle during the injection molding process, avoids the problem of reduced sealing of the hot runner hose injection port due to displacement, and simplifies the maintenance operations of the injection hot runner mold, thereby improving the reliability of the overall injection molding system.

[0025] In a preferred example, the present invention can be further configured as follows: the needle valve adjustment member has a first axial hole, the first axial hole has a first tool adjustment section and a connecting section for combining with the tensioning member; the sealing member has a second axial hole, the second axial hole has a second tool adjustment section and a through hole section for the tensioning member to penetrate; the top surface of the tensioning member is provided with a third axial hole for the third tool adjustment section; the first axial hole, the second axial hole and the third axial hole are aligned with the axis of the adjustment hole.

[0026] By adopting the above-mentioned preferred technical features, the precise coaxial installation of the needle valve adjustment part, the blocking part and the tensioning part can be achieved through the design of the axial hole alignment of the three. The specific effects are as follows: 1. The first shaft hole cooperates with the connecting section of the tension piece to ensure the firm connection between the needle valve adjustment piece and the tension piece to prevent loosening; 2. The through-hole section of the second axial hole provides a penetration path for the tensioning member, and the second tool adjustment section is used to achieve precise installation of the blocking member; 3. The third axis hole is set on the top surface of the tensioner, which is convenient for adjusting the tightness of the tensioner using tools to ensure uniform distribution of preload force; 4. The three shaft holes are aligned on the same axis, and the same set of valve needle adjustment tool positioning kit can be used, which effectively avoids stress concentration caused by eccentricity during installation and improves the stability and reliability of the overall structure.

[0027] The second main purpose of the present invention is achieved through the following technical solutions: A needle valve driving device provided on a hot runner support is proposed, comprising: The aggregate bowl is fixed to the hot runner bracket, and a limiting ring groove is provided on the outer side of the bowl mouth; The driving chamber is provided on the aggregate bowl and comprises a shell and a bottom plate, wherein the bottom opening of the shell is closed by the bottom plate, and an air expansion groove and a second buckle groove are provided on the inner side of the shell; A piston disc is accommodated in the housing and has an adjustment hole passing through its axis; A needle valve adjusting member, rotatably mounted in the adjusting hole, for connecting the valve needle; An elastic inner ring is buckled into the second buckle groove to prevent the bottom plate from falling out; A plurality of axial limiting rods, one end of which is embedded in the lock hole of the shell side wall and the other end protrudes and is locked in the limiting ring groove, so that the shell of the drive chamber rotates with resistance relative to the aggregate bowl; a blocking member installed in the adjustment hole to limit the rise of the needle valve adjustment member; a tensioning member, passing through the blocking member and connected to the needle valve adjusting member to limit the descent of the needle valve adjusting member; The first axial hole of the needle valve adjustment member, the second axial hole of the blocking member and the third axial hole of the tensioning member are coaxially aligned to form a double locking mechanism.

[0028] By adopting the above-mentioned basic device technical solution, the above technical solution achieves the following significant technical effects: 1. The "resistance-driven rotation" design of the drive chamber optimizes the layout of the drive flow path and enhances operational stability. By rotating the drive chamber housing with resistance relative to the aggregate bowl, the spatial orientation of the drive flow path can be adjusted without disassembling the mold, avoiding the risk of breakage due to wiring interference between multiple drive flow paths. One end of the axial limit rod is embedded in the connection housing's lock hole, while the other end protrudes and locks into the limit ring groove of the aggregate bowl. This allows the drive chamber to rotate in the XY plane to adjust the drive flow path layout, while preventing accidental displacement during rotation through frictional resistance, ensuring the stability of the adjusted flow path position and limiting Z-axis separation between the drive chamber and aggregate bowl. 2. The double locking mechanism features a blocking piece that limits upward movement, a tensioning piece that limits downward movement, and coaxial alignment of the three axial holes. The blocking piece is installed in the piston disc adjustment hole, directly contacting the needle valve adjustment piece to prevent it from moving upward under injection pressure or vibration, thus avoiding seal failure caused by valve needle displacement. The tensioning piece (specifically, a counter-locking screw) passes through the blocking piece and connects to the needle valve adjustment piece, limiting its downward movement through thread preload, eliminating the risk of sinking due to gravity or mechanical vibration. The first axial hole of the needle valve adjustment piece, the second axial hole of the blocking piece, and the third axial hole of the tensioning piece are coaxially aligned, ensuring even distribution of locking force, avoiding localized wear caused by eccentric stress, and improving vibration resistance (compared to a single-thread combination, vibration resistance is improved by more than 60%). 3. Modular maintenance advantage: quick disassembly and assembly. The elastic inner ring snaps into the second buckle groove of the shell, and combined with the locking of the axial limit rod, the drive chamber and the aggregate bowl form a modular connection. During maintenance, only the axial limit rod needs to be released to separate the drive chamber, without disassembling the mold, which improves maintenance efficiency by 50%; 4. The air expansion groove function improves sealing and durability. The air expansion groove on the inside of the shell optimizes the distribution of the driving airflow. Even if the piston disc drops to the bottom dead center and contacts the base plate, the air pressure below the piston disc can be maintained due to the setting of the air expansion groove, reducing the vibration interference of the piston disc caused by the impact of the airflow. At the same time, the pre-tightening force of the elastic inner ring compensates for thermal expansion in a high-temperature environment, avoiding failure of the drive chamber seal.

[0029] The third main purpose of the present invention is achieved through the following technical solutions: A method for assembling a needle valve drive device on a hot runner bracket is proposed, comprising the following steps: S1. Fix the collecting bowl on the hot runner bracket; S2. Assemble the drive chamber and the piston disc, wherein the housing of the drive chamber has a bottom opening, the piston disc is accommodated in the housing, the piston disc has an upper sleeve and a lower sleeve located at the axis, and an adjustment hole passing through the upper sleeve and the lower sleeve; the bottom plate of the drive chamber is coupled to the bottom opening; S3, setting the driving chamber on the collecting bowl, and the shell of the driving chamber rotates with resistance relative to the collecting bowl; S4. An adjustably mounted needle valve adjusting member is placed in the adjusting hole of the piston disc, wherein the needle valve adjusting member is pre-assembled with one end of a valve needle.

[0030] By adopting the above basic method and technical solution, an assembly method that can effectively solve the problems of adjustable valve needle movement deviation and drive flow path interference is realized. The specific effects are as follows: 1. By fixing the aggregate bowl to the hot runner bracket, the foundation stability of the entire drive unit is ensured, avoiding additional vibration or displacement problems caused by unstable installation; 2. By accommodating the piston disc within the drive chamber housing and sealing the bottom opening with a base plate, a sealed and stable internal drive environment is formed, ensuring precise installation and adjustment of the subsequent needle valve adjustment components and optimizing the internal structural layout. 3. By placing the drive chamber on the collecting bowl and ensuring that the drive chamber housing rotates with resistance relative to the collecting bowl, the routing of the drive flow path is effectively optimized, reducing the risk of flow path pulling or breaking due to external operation or environmental factors, and enhancing the reliability of the entire hot runner system. 4. By adjustably installing the needle valve adjustment piece in the adjustment hole of the piston disc and engaging one end of the valve needle, the needle valve drive device is installed first and then the valve needle position is controlled, thereby improving the sealing performance of the injection port and the flow control accuracy during the injection molding process.

[0031] In a preferred embodiment, the present invention may be further configured as follows: the assembly method further includes: S5. When the needle valve closes the glue injection port, adjust the position of the needle valve adjusting member in the adjusting hole of the piston disc.

[0032] By employing these preferred technical features, the position of the needle valve adjustment member within the piston disc adjustment hole can be precisely adjusted when the valve needle closes the injection port. This adjustment method ensures the valve needle's tightness in the closed state while providing an accurate reference position for subsequent installation of the sealing member and tensioning member, effectively avoiding deviations in the valve needle's movement caused by inaccurate initial positioning. Specifically, this step, combined with the rotational resistance characteristics of the drive chamber, optimizes the layout of the drive flow path, reduces the impact of external interference on the valve needle adjustment process, and thus improves the stability and reliability of the entire needle valve drive device.

[0033] In a preferred embodiment, the present invention may be further configured as follows: the assembly method further includes: S6. After adjusting the needle valve adjusting member, installing a blocking member in the adjusting hole of the piston disc, wherein the blocking member contacts the needle valve adjusting member to limit the upward movement of the needle valve adjusting member in the adjusting hole; S7. After installing the blocking member, install a tensioning member in the adjustment hole of the piston disc. The tensioning member passes through the blocking member and is installed on the needle valve adjustment member. The tensioning member limits the descent of the needle valve adjustment member in the adjustment hole.

[0034] By adopting the above-mentioned preferred technical features, the blocking piece is installed in the adjustment hole of the piston disc, effectively limiting the upward displacement of the needle valve adjustment part in the adjustment hole, ensuring the positional stability of the needle valve adjustment part. The tensioning piece passes through the blocking piece and connects to the needle valve adjustment part, further limiting the downward displacement of the needle valve adjustment part in the adjustment hole, forming a two-way locking mechanism. This double locking method significantly improves the vibration resistance of the valve needle in high-frequency vibration environments and avoids the problem of reduced sealing caused by displacement of the needle valve adjustment part during the injection molding process.

[0035] In summary, the present invention includes at least one of the following technical effects that contribute to the prior art: 1. The drive chamber forms a resistance-resistant rotational connection with the aggregate bowl via an axial limit rod, optimizing the layout of the drive flow path, significantly reducing the risk of flow path interference, and avoiding flow path breakage caused by external forces during valve needle height adjustment. 2. The needle valve adjustment component adopts a dual locking mechanism of a blocking piece and a tensioning piece, effectively preventing the valve needle from moving in high-frequency vibration and high-temperature environments, improving the sealing and stability of the hot runner system mold, and improving vibration resistance by more than 60%; 3. The modular design of the needle valve drive unit makes maintenance operations more convenient. The valve needle height position can be quickly adjusted without disassembling the mold, reducing overall maintenance time by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A three-dimensional schematic diagram of a needle valve driving device provided on a hot runner support according to an embodiment of the present invention is shown; Figure 2 An exploded view of the components of the drive device is shown; Figure 3 A schematic cross-sectional view of the driving device is shown; Figure 4 A block diagram illustrating the assembly process of a needle valve driving device provided on a hot runner support according to an embodiment of the present invention is shown; Figure 5 Draw Figure 2Schematic diagram of the fixed setting of the middle aggregate bowl (corresponding to step S1, (A) is a half-cut perspective view, (B) is a cross-sectional view); Figure 6 Draw Figure 2 Schematic diagram of the assembly of the middle drive chamber and the piston disc (corresponding to step S2, (A) is a half-cutaway perspective view, and (B) is a cross-sectional view); Figure 7 Draw Figure 2 Schematic diagram of the connection between the middle drive chamber and the aggregate bowl (corresponding to step S3, (A) is a half-cut perspective view, (B) is a cross-sectional view); Figure 8 Draw Figure 2 A cross-sectional view of the needle valve adjustment member installed in the piston disc (corresponding to step S4); Figure 9 Draw Figure 2 Schematic diagram of adjusting the needle valve adjusting member in the adjustment hole of the piston disc using the valve needle adjusting tool (corresponding to step S5); Figure 10 Draw Figure 2 A three-dimensional schematic diagram of the installation of the middle sealing member and the tensioning member in the piston disc (corresponding to steps S6 and S7); Figure 11 Draw Figure 9 A perspective diagram of a valve needle adjustment tool used in; Figure 12 Draw Figure 9 Exploded view of the valve stem adjustment tool used in the Figure 13 A top view schematically illustrates the hot runner adjustable needle valve driving device in an adjustment state (corresponding to steps S5 to S7 ).

[0037] Reference numerals: 110, hot runner bracket; 120, valve needle; 130, hot runner hose; 131, glue injection port; 132, glue injection line; 200, valve needle adjustment tool; 210, positioning kit; 211, positioning plate; 212, shell positioning rod; 213, piston positioning cylinder; 214, outer ring fixed end; 220, blocking positioning sleeve; 221, positioning end; 222, inner ring fixed end; 230, adjustment handle; 231, adjustment end; 240, fixed handle; 10, aggregate bowl; 11, limiting ring groove; 12, chassis; 13, sheath; 14, bottom cover; 20, drive chamber; 21 , shell; 22, bottom plate; 23, first buckle groove; 24, locking hole; 25, air expansion groove; 26, second buckle groove; 27, drive flow path interface; 28, first positioning hole; 29, second positioning hole; 30, piston disk; 31, upper sleeve; 32, lower sleeve; 33, adjustment hole; 34, positioning notch; 40, needle valve adjustment part; 41, first axial hole; 42, first tool adjustment section; 43, connecting section; 50, axial limit rod; 60, elastic inner ring; 70, sealing part; 71, second axial hole; 72, second tool adjustment section; 73, through hole section; 80, tensioning part; 81, third axial hole. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying 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 embodiments described are only part of the embodiments for understanding the inventive concept of the present invention, and cannot represent all embodiments, nor are they interpreted as the only embodiments. Based on the embodiments of 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.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. In order to facilitate the understanding of the technical solution of the present invention, the hot runner system mold of the present invention will be further described and explained in detail below, but it is not used as a limited scope of protection for the present invention. The existing adjustable valve needle drive device has problems such as easy displacement of the valve needle after height adjustment and interference caused by complex drive flow path routing. The traditional locking structure is single and cannot adapt to high-frequency vibration and high-temperature environment, resulting in poor sealing and low maintenance efficiency. To this end, the present invention mainly adopts the following scheme to achieve the effect of optimizing the flow path layout through the resistance rotation design of the drive cavity, and fixing the valve needle position through the double locking mechanism of the sealing piece and the anti-locking screw. The present invention is further described in detail below.

[0040] The "resistance-resistance rotation" proposed in this invention refers to the rotational characteristics achieved between the drive chamber housing and the aggregate bowl through the synergistic effect of mechanical limiting and frictional resistance. Specifically, under the influence of an artificial external force, the drive chamber housing rotates to change the arrangement of the drive flow path interface on the hot runner bracket. When the external force is released, the drive chamber housing stops rotating and does not continue to rotate. This balances dynamic adjustment and static stability, allowing the drive chamber to rotate to accommodate complex flow path layouts while ensuring the stability of the adjusted position through resistance design, resolving the contradiction between traditional rigid connections (which cannot be adjusted) and free rotation (which is prone to deviation).

[0041] Figure 1 A three-dimensional schematic diagram of a needle valve driving device provided on a hot runner support according to an embodiment of the present invention is shown; Figure 2 An exploded view of the components of the device; Figure 3 A schematic cross-sectional view of the device is shown. The drawings include common features 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, those skilled in the art should correctly and reasonably understand and judge whether the individual technical features described below or any combination thereof can represent the same embodiment, or whether multiple technical features that are mutually exclusive in essence can represent different variations of the embodiments. Figure 8 、 Figure 10 and Figure 13 As shown, multiple hot runner adjustable needle valve actuators are integrally mounted on a hot runner support 110 and used in hot runner system molds to drive the valve needle 120 up and down, opening and closing the injection molding machine. To meet the demands of modern production processes, the hot runner adjustable needle valve actuators are required to be unaffected by the wear of the valve needle 120 and to more precisely open and close the injection port 131. Typically, the valve needle 120 is mounted within a hot runner hose 130. Driven by the hot runner adjustable needle valve actuators, the valve needle 120 closes the injection port 131, which serves as the outlet of the hot runner hose 130. The plastic material within the hot runner hose 130 is introduced via an injection line 132. The hot runner hose 130 is thermally conductive, heating the plastic material within. After heating, the plastic material is discharged through the injection port 131 and enters the injection mold (not shown), where it is subsequently formed into various products. As product shapes become more complex and precision requirements increase, more and more hot runner adjustable needle valve drive devices will be installed on a hot runner bracket 110, corresponding to the increasing number of valve needles 120. How to ensure that the needle tips of the numerous valve needles 120 accurately and appropriately close the injection ports 131 of the corresponding hot runner hoses 130 is a technical issue that requires continued research.

[0042] Reference Figure 1 、 Figure 2 and Figure 3In an embodiment of the device, the present invention proposes a needle valve driving device provided on a hot runner bracket, comprising: a collecting bowl 10 fixed on the hot runner bracket 110 to collect overflowed injection molding material, a driving chamber 20 provided on the collecting bowl 10 to provide a driving space for a valve needle 120, a piston disc 30 accommodated in a shell 21 of the driving chamber 20 for driving the valve needle 120 to switch and lift, and a needle valve adjusting member 40 adjustably installed in an adjusting hole 33 of the piston disc 30 for combining with one end of the valve needle 120. Among them, the driving chamber 20 includes a shell 21 with a bottom opening and a bottom plate 22 combined with the bottom opening; the piston disk 30 has an upper sleeve 31 and a lower sleeve 32 located at the axis center and an adjustment hole 33 passing through the upper sleeve 31 and the lower sleeve 32; wherein, the shell 21 of the driving chamber 20 rotates with resistance relative to the collecting bowl 10, thereby realizing a stable connection between the driving chamber 20 and the collecting bowl 10, and at the same time facilitating the adjustment of the layout of the driving flow path, thereby achieving the purpose of optimizing the routing of the driving flow path.

[0043] In this embodiment, refer to Figure 2 and Figure 3 , a method for fixing the collecting bowl 10 to the hot runner bracket 110 is as follows. The collecting bowl 10 includes a bowl body with an opening expanded and facing upward. A receiving hole is provided in the center of the bottom of the bowl body. A base plate 12 is mounted on the receiving hole. The periphery of the base plate 12 buckles the receiving hole of the bowl body. The base plate 12 is mounted to the hot runner bracket 110 through an external connecting rod. A sleeve 13 and a bottom cover 14 are provided above the base plate 12. The bottom cover 14 is coupled to the base plate 12 through an internal connecting rod to clamp the sleeve 13. A converging protective tube extends from the bottom of the sleeve 13, passing through the base plate 12 to the valve hole of the hot runner bracket 110. The sleeve 13 can protect the valve needle 120 and reduce the injection plastic material being carried out by the valve needle 120 and overflowing into the collecting bowl 10. The bottom cover 14 protrudes from the bottom of the collecting bowl 10 to help scrape off the injection plastic material adhering to the wall of the valve needle 120. The bottom of the chassis 12 has a downwardly protruding annular profile that fits tightly against the surface of the hot runner support 110 to prevent the injection molding compound from overflowing. The sheath 13 is confined to the limited space between the chassis 12 and the bottom cover 14. As the valve needle 120 rises and falls, the sheath 13 moves in a limited stroke, which helps to scrape the compound off the wall of the valve needle 120. The separation of the bottom cover 14, the sheath 13, and the chassis 12 helps to prevent heat transfer between the collection bowl 10 and the hot runner support 110, and the injection molding compound overflowing from the collection bowl 10 will not be heated and solidified. Figure 2 The chassis 12 is provided with eight connection holes, four of which can be used to install external connection rods, two of which can be used to connect internal connection rods, and the remaining two can establish an overflow recovery path.

[0044] When the collecting bowl 10 is fixedly coupled to the hot runner bracket 110, the driving chamber 20 exhibits resistance to rotation. The driving fluid path interface 27 is provided on the driving chamber 20 and can be located on the top or side of the shell 21, so that the routing of the driving fluid path connected to the driving fluid path interface 27 on the hot runner bracket 110 can be adjusted. That is, the rotation of the driving chamber 20 can change the relative position of the driving fluid path interface 27 on the hot runner bracket 110, thereby reducing the mutual interference between the driving fluid path connected to the driving fluid path interface 27, thereby optimizing the overall layout of the driving fluid path on the hot runner bracket 110. In this embodiment, you can refer to Figure 13 and Figure 3 Two driving flow path interfaces 27 are provided on the top surface of the housing 21, one of which is a down-pressure port ( Figure 13 The driving flow path interface 27 located above is connected to the upper chamber of the piston disk 30 in the driving chamber 20, and the other driving flow path interface 27 is the rising gas port ( Figure 13 The two drive flow path interfaces 27 located at the bottom of the drive chamber 20 are connected to the chamber below the piston disc 30 in the drive chamber 20. The two drive flow path interfaces 27 introduce different fluid pressures, imparting different pressure differentials between the upper and lower chambers of the piston disc 30, causing the piston disc 30 to move downward (valve needle 120 closed) or upward (valve needle 120 open). In a variation, the two drive flow path interfaces 27 are opened on the side of the drive chamber 20, specifically on the bottom plate 22 of the drive chamber 20; the rotation of the drive chamber 20 can also change the relative position of the drive flow path interfaces 27 on the hot runner bracket 110. Specifically, the top surface interface is conducive to vertical flow path connection, while the side interface is more suitable for horizontal layout adjustment, thereby adapting to the hot runner mold design requirements of different injection molding machines.

[0045] Because the housing 21 of the drive chamber 20 rotates with resistance relative to the aggregate bowl 10, the routing of the drive flow path can be flexibly adjusted on the hot runner bracket 110, effectively reducing the risk of mutual interference between the drive flow paths. At the same time, this valve needle adjustable drive device provides convenience for subsequent adjustment and maintenance. It not only avoids the problem of disassembling the mold when adjusting the valve needle 120 under the rigid connection structure of the traditional non-adjustable valve needle, but also solves the problem of low efficiency and inconvenient operation of the valve needle height adjustment and position maintenance caused by the vibration offset of the valve needle 120 and the interference of the drive flow path routing in the traditional adjustable valve needle drive device.

[0046] The so-called "rotation with resistance" in this embodiment is specifically structured as follows: the collection bowl 10 has an upwardly enlarged opening for the drive chamber 20 to be positioned above, and the collection bowl 10 is provided with a retaining ring groove 11 on the outside of the opening; the inner side of the housing 21 is provided with a first retaining groove 23 for engaging the edge of the bottom plate 22, and the sidewall of the drive chamber 20 is provided with multiple locking holes 24 between the first retaining groove 23 and the bottom opening. Multiple axial retaining rods 50 are connected to the retaining holes 24, with one end of each axial retaining rod 50 protruding from the retaining hole 24 and resting in the retaining ring groove 11 to prevent the collection bowl 10 from falling out. Multiple axial stop rods 50 are connected to the locking hole 24, with one end protruding from the locking hole 24 and resting in the stop ring groove 11. This creates a multi-point mechanical constraint, limiting the free rotation of the drive chamber 20. This mechanical stop structure ensures that the housing 21 of the drive chamber 20 rotates with resistance relative to the collection bowl 10 and prevents separation of the housing 21 from the collection bowl 10. This optimizes the routing of the drive fluid path and reduces the risk of wiring interference, achieving a "resistance-based rotation" feature, significantly improving the structural stability and ease of maintenance of the device. In variations, other known mechanical structures can also be combined to achieve this "resistance-based rotation" feature. This resistance is adjustable, with the magnitude of the rotational resistance determined by the preload of the axial stop rods 50, the material hardness of the elastic inner ring 60, and the dimensional tolerance of the stop ring groove 11. This ensures that the drive chamber 20 can be rotated manually to adjust the fluid path layout, but requires the application of a certain external force (such as wrench torque) to prevent displacement caused by vibration or accidental contact. When the driving chamber 20 is adjusted to the target position, the meshing surface of the axial limiting rod 50 and the limiting ring groove 11 forms a mechanical self-locking function, combined with the friction resistance of the elastic inner ring 60 acting on the bowl 10 (see Figure 3 ), achieving fixed position without the need for an additional locking device. The drive chamber 20 can rotate with resistance relative to the aggregate bowl 10, ensuring a stable connection between the two and facilitating adjustment of the drive flow path layout, reducing the risk of flow path interference.

[0047] For specific examples, see Figure 3The housing 21 also has an air expansion groove 25 and a second locking groove 26 on its inner side. The air expansion groove 25 defines the lower limit of the piston plate 30's plate movement. The second locking groove 26 is provided for mounting an elastic inner ring 60. The aforementioned first locking groove 23 is secured to the peripheral flange of the base plate 22. The base plate 22 is positioned between the air expansion groove 25 and the second locking groove 26. The second locking groove 26 is located between the first locking groove 23 and the locking hole 24. The hot runner adjustable needle valve drive device also includes an elastic inner ring 60, which locks into the second locking groove 26 to prevent the base plate 22 from being dislodged. The elastic inner ring 60 is specifically a metal elastic ring with a telescopic notch. Uncompressed, its outer diameter is larger than the inner diameter of the housing 21. After compression, its outer diameter can be smaller than the inner diameter of the housing 21. The elastic inner ring 60 provides a preload to secure it in the second locking groove 26. The rim of the collecting bowl 10 contacts the elastic inner ring 60. The elastic inner ring 60 is buckled into the second buckle groove 26 to effectively prevent the bottom plate 22 from escaping from the shell 21. The rim of the collecting bowl 10 contacts the elastic inner ring 60 to ensure the stability of the drive chamber 20, so that the drive chamber 20 is arranged above the collecting bowl 10.

[0048] For specific examples, see Figure 1 and Figure 3 The housing 21 has a first positioning hole 28 defined on its upper surface, and the upper sleeve 31 has a positioning notch 34 defined thereon. This, combined with the multiple positioning of the needle adjustment tool 200, addresses the technical difficulty of preventing the housing 21 of the drive chamber 20, which has a rotational resistance characteristic, from adjusting the relative position of the needle valve adjustment member 40 connected to the valve needle 120 within the adjustment hole 33 of the piston plate 30. In other words, this embodiment eliminates the need for longitudinal guide grooves on the inner sidewall of the drive chamber 20 to guide the piston plate 30. Prior to positioning the notch 34, such as during actuation of the valve needle 120, the piston plate 30 can rotate freely. This allows the inner sidewall of the drive chamber 20 to be smooth, enabling the piston plate 30 to rise and slide more smoothly.

[0049] The first positioning hole 28 provided on the upper surface of the housing 21 and the positioning notch 34 provided on the shaft sleeve 31 of the piston disc 30 are used for positioning, for example, Figure 11 and Figure 12 The illustrated needle adjustment tool 200 prevents arbitrary rotation of the housing 21 of the drive chamber 20, while the positioning notch 34 prevents arbitrary rotation of the piston plate 30 during the needle height adjustment process. This effectively addresses the difficulty in accurately adjusting the relative position between the needle valve adjustment member 40 and the adjustment hole 33 of the piston plate 30, while the housing 21 of the drive chamber 20 resists rotation. Specifically, the coordination of the first positioning hole 28 and the positioning notch 34 provides a clear alignment reference during assembly of the valve needle 120, ensuring accurate installation and adjustment of the needle valve adjustment member 40, thereby improving the assembly efficiency and reliability of the entire needle valve drive device.

[0050] For specific examples, see Figure 3 The bottom surface of the bottom plate 22 is provided with a second positioning hole 29. The second positioning hole 29 provided on the bottom surface of the bottom plate 22 can be positioned in conjunction with the first positioning hole 28 of the housing 21. Prior to assembling the drive chamber 20 and the collection bowl 10, the bottom plate 22 can better seal the bottom opening of the housing 21, thereby completing the pre-assembly of the drive chamber 20 and the piston disc 30, which have a rotation resistance characteristic. When the drive chamber 20 is installed above the collection bowl 10, the contact between the lower surface periphery of the bottom plate 22 and the upper surface of the elastic inner ring 60 increases the resistance of the drive chamber 20 housing 21 during rotation. The periphery of the bottom plate 22 can form a hysteresis resistance to asynchronous rotation relative to the drive chamber 20 housing 21.

[0051] For specific examples, see Figure 1 、 Figure 2 and Figure 3 The hot runner adjustable needle valve drive device further includes: a blocking member 70 for blocking the needle valve adjustment member 40 from rising in the adjustment hole 33, and a tensioning member 80 for limiting the needle valve adjustment member 40 from descending in the adjustment hole 33. The blocking member 70 is installed in the adjustment hole 33 of the piston plate 30. The needle valve adjustment member 40 has a snap-fitting groove to snap into the needle tail end of the valve needle 120. The outer side surface of the needle valve adjustment member 40 is provided with an external thread to screw into the adjustment hole 33 with an internal thread of the piston plate 30; the needle tip of the valve needle 120 is used to close the injection port 131 of the hot runner hose 130 (see Figure 8 On the other hand, the outer surface of the blocking member 70 is also provided with external threads for screwing into the adjustment hole 33. The tensioning member 80 is located within the adjustment hole 33 of the piston plate 30 and extends through the blocking member 70 to be mounted and connected to the needle valve adjustment member 40. The tensioning member 80 and the adjustment hole 33 of the piston plate 30 do not necessarily have a direct connection. The tensioning member 80 passes through the blocking member 70 and connects to the needle valve adjustment member 40, forming a three-piece integrated connection structure within the adjustment hole 33, thereby dually restricting the needle valve adjustment member 40 from both rising and descending within the adjustment hole 33.

[0052] Specifically, the blocking member 70 effectively prevents the needle valve adjustment member 40 from upward displacement due to external forces or vibrations, while the tensioning member 80, by penetrating the blocking member 70 and connecting to the needle valve adjustment member 40, further restricts its downward movement, thereby ensuring the positional stability of the needle valve adjustment member 40 within the adjustment hole 33. This dual locking mechanism significantly improves the vibration resistance of the adjusted valve needle 120 during the injection molding process, preventing the degradation of the sealing performance of the hot runner hose 130 injection port 131 due to displacement, simplifying maintenance operations of the injection hot runner mold, and improving the reliability of the entire injection molding system.

[0053] For specific examples, see Figure 2 and Figure 8 The needle valve adjustment member 40 has a first axial hole 41, which has a first tool adjustment section 42 and a connecting section 43 for connecting with the tensioning member 80, and the first axial hole 41 is a non-through shape; the blocking member 70 has a second axial hole 71, which has a second tool adjustment section 72 and a through hole section 73 for the tensioning member 80 to pass through, and the second axial hole 71 is a through shape; the top surface of the tensioning member 80 is provided with a third axial hole 81 for the third tool adjustment section, and the bottom of the tensioning member 80 is provided with a connecting section for connecting the needle valve adjustment member 40; the first axial hole 41, the second axial hole 71 and the third axial hole 81 are aligned with the axis of the adjustment hole 33. The precise coaxial installation of the three is achieved by the axial hole alignment design of the needle valve adjustment member 40, the blocking member 70 and the tensioning member 80. In a preferred example, the first tool adjustment section 42 and the third tool adjustment section of the third axial hole 81 can be the same, so as to be adjusted by the same tool part (see Figure 11 and Figure 12 The second tool adjustment section 72 is larger than the first tool adjustment section 42 or larger than the third tool adjustment section to be adjusted by the larger tool part (see Figure 11 and Figure 12 The positioning sleeve 220 is sealed with a positioning end 221. This structure facilitates the use of a single dedicated tool, the needle adjustment tool 200, to operate on the axial holes of the needle valve adjustment member 40, the blocking member 70, and the tensioning member 80, ensuring coaxial alignment and improving adjustment efficiency and accuracy. In this specific example, the tensioning member 80 is a reverse-locking screw, whose threads mate with the connecting section 43 of the needle valve adjustment member 40. This effectively limits the downward movement of the needle valve adjustment member 40, enhancing the locking effect.

[0054] The specific effects of the previous feature combination include: 1. The first axial hole 41 of the needle valve adjustment member 40 cooperates with the connecting section of the tension member 80 to ensure a secure connection between the needle valve adjustment member 40 and the tension member 80 and prevent loosening; 2. The through hole section 73 of the second axial hole 71 provides a through path for the tensioning member 80 , and the second tool adjustment section 72 is used to achieve accurate installation of the blocking member 70 ; 3. The third axial hole 81 is provided on the top surface of the tensioning member 80, so as to facilitate the use of tools to adjust the tightness of the tensioning member 80 and ensure uniform distribution of the pre-tightening force; 4. The three shaft holes are aligned on the same axis and can use the same positioning kit of the valve needle adjustment tool 200, which effectively avoids stress concentration caused by eccentricity during installation and improves the stability and reliability of the overall structure.

[0055] See Figure 1 、 Figure 2 and Figure 3 Another embodiment of the present invention further provides a needle valve driving device provided on a hot runner support, comprising: The collecting bowl 10 is fixed to the hot runner bracket 110, and a limiting ring groove 11 is provided on the outer side of the bowl mouth; The driving chamber 20 is provided on the collecting bowl 10 and includes a shell 21 and a bottom plate 22. The bottom opening of the shell 21 is closed by the bottom plate 22, and an air expansion groove 25 and a second buckle groove 26 are opened on the inner side of the shell 21; The piston disc 30 is accommodated in the housing 21 and has an adjustment hole 33 passing through its axis; The needle valve adjusting member 40 is rotatably mounted in the adjusting hole 33 and is used to connect the valve needle 120; The elastic inner ring 60 is buckled into the second buckle groove 26 to prevent the bottom plate 22 from falling out; A plurality of axial limiting rods 50, one end of which is embedded in the lock hole 24 of the side wall of the housing 21 and the other end protrudes and is locked in the limiting ring groove 11, so that the housing 21 of the drive chamber 20 rotates with resistance relative to the collecting bowl 10; a blocking member 70 installed in the adjustment hole 33 to limit the rise of the needle valve adjustment member 40; a tensioning member 80 , passing through the blocking member 70 and connected to the needle valve adjusting member 40 , so as to limit the descent of the needle valve adjusting member 40 ; The first axial hole 41 of the needle valve adjustment member 40 , the second axial hole 71 of the blocking member 70 and the third axial hole 81 of the tensioning member 80 are coaxially aligned to form a double locking mechanism.

[0056] The above technical solution achieves the following significant technical effects: 1. The "resistance-resistance rotation" design of the drive chamber 20 optimizes the layout of the drive flow path and improves operational stability. By rotating the housing 21 of the drive chamber 20 relative to the aggregate bowl 10 with resistance, the spatial orientation of the drive flow path can be adjusted without disassembling the mold, thus avoiding the risk of breakage of multiple drive flow paths due to wiring interference. One end of the axial limit rod 50 is embedded in the lock hole 24 of the housing 21, and the same end protrudes and locks into the limiting ring groove 11 of the aggregate bowl 10. This allows the drive chamber 20 to rotate in the XY plane to adjust the layout of the drive flow path, while preventing accidental displacement during rotation through frictional resistance, ensuring the stability of the adjusted flow path position, and limiting the Z-direction separation of the drive chamber 20 and the aggregate bowl 10. 2. The double locking mechanism features a blocking member 70 that limits upward movement and a tensioning member 80 that limits downward movement, with the three axial holes being coaxially aligned. The blocking member 70 is installed in the adjustment hole 33 of the piston disc 30, directly contacting the needle valve adjustment member 40 to prevent it from moving upward under injection pressure or vibration, thus avoiding sealing failure caused by displacement of the valve needle 120 and achieving a valve needle position error of less than 0.02mm (compared to 0.1mm in the traditional solution). The tensioning member 80 (specifically, a counter-locking screw) passes through the blocking member 70 and connects to the needle valve adjustment member 40, limiting downward movement of the needle valve adjustment member 40 through threaded preload, eliminating the risk of sinking due to gravity or mechanical vibration. The first axial hole 41 of the needle valve adjustment member 40, the second axial hole 71 of the blocking member 70, and the third axial hole 81 of the tensioning member 80 are coaxially aligned, ensuring uniform distribution of locking force, avoiding localized wear caused by eccentric stress, and improving vibration resistance (vibration resistance is improved by more than 60%). 3. Modular maintenance advantages enable quick assembly and disassembly. The elastic inner ring 60 snaps into the second snap groove 26 of the housing 21, and combined with the locking of the axial limit rod 50, the drive chamber 20 and the aggregate bowl 10 form a modular connection. During maintenance, the drive chamber 20 can be separated by simply releasing the axial limit rod 50 without disassembling the mold, which improves maintenance efficiency by 50%. 4. The function of the expansion groove 25 is to improve sealing and durability. The expansion groove 25 on the inside of the housing 21 optimizes the distribution of the driving airflow. Even when the piston disc 30 reaches its bottom dead center and contacts the base plate 22, the air pressure below the piston disc 30 is maintained due to the expansion groove 25. This reduces the vibration interference of the airflow impact on the piston disc 30. At the same time, the preload of the elastic inner ring 60 compensates for thermal expansion in high-temperature environments, preventing seal failure in the drive chamber 20. The seal pressure resistance of the drive chamber 20 of the present invention is increased from 15MPa to 25MPa%, and the seismic resistance of the needle valve adjustment member 40 is improved from 8g to 15g.

[0057] In a variation, the hot runner adjustable needle valve drive incorporates a micro-pressure sensor (e.g., a MEMS sensor) within the piston disc 30 or drive chamber 20 to monitor the valve needle sealing pressure in real time. This drive is connected to an adaptive locking system that automatically triggers secondary locking of the tensioning member 80 when the vibration frequency of the drive chamber 20 is detected to be greater than 100 Hz. This creates a "perception-decision-execution" intelligent closed loop, meeting the requirements of Industry 4.0. Furthermore, a cartilage-like friction layer (e.g., a PTFE composite material) is provided at the end of the axial limit rod 50, which is used to press against the limit ring groove 11 of the aggregate bowl 10. This stabilizes the rotational friction coefficient of the drive chamber 20 (0.12-0.15), ensuring a free rotation angle of 5 degrees or less in the absence of external force and extending the maintenance cycle.

[0058] See Figure 4Another embodiment of the present invention further provides an assembly method for a needle valve drive device provided on a hot runner bracket, comprising steps S1 to S7, wherein steps S5 to S7 are optional steps; the main steps S1 to S4 are as follows: Step S1 can be found in Figure 5 , the collecting bowl 10 is fixed on the hot runner bracket 110; Step S2 can be found in Figure 6 , assemble the drive chamber 20 and the piston disc 30, wherein the housing 21 of the drive chamber 20 has a bottom opening, and the piston disc 30 is accommodated in the housing 21, and the piston disc 30 has an upper sleeve 31 and a lower sleeve 32 located at the axis, and an adjustment hole 33 passing through the upper sleeve 31 and the lower sleeve 32; the bottom plate 22 of the drive chamber 20 is combined with the bottom opening; Step S3 can be found in Figure 7 The driving chamber 20 is disposed on the collecting bowl 10 , and the housing 21 of the driving chamber 20 rotates with resistance relative to the collecting bowl 10 ; Step S4 can be found in Figure 8 The needle valve adjusting member 40 is adjustably installed in the adjusting hole 33 of the piston plate 30 , and the needle valve adjusting member 40 is pre-combined with one end of the valve needle 120 .

[0059] By adopting the above basic method and technical solution, an assembly method is realized that can effectively solve the problem of movable deviation of the adjustable valve needle 120 and interference with the driving flow path. The specific effects are as follows: 1. By fixing the collecting bowl 10 to the hot runner bracket 110, the foundation stability of the entire drive device is ensured, avoiding additional vibration or displacement caused by unstable installation; 2. By accommodating the piston disc 30 within the housing 21 of the drive chamber 20 and sealing the bottom opening with the base plate 22, a sealed and stable internal driving environment is formed, ensuring the precise installation and adjustment of the needle valve adjustment member 40 and optimizing the internal structural layout. 3. By positioning the drive chamber 20 on the collecting bowl 10 and ensuring that the housing 21 of the drive chamber 20 rotates with resistance relative to the collecting bowl 10, the routing of the drive flow path is effectively optimized, reducing the risk of flow path pulling or breaking due to external operation or environmental factors, and enhancing the reliability of the entire hot runner system. 4. By adjustably installing the needle valve adjustment member 40 in the adjustment hole 33 of the piston plate 30 and engaging one end of the valve needle 120, the needle valve drive device is installed first and then the position of the valve needle 120 is controlled, thereby improving the sealing performance of the injection port 131 and the flow control accuracy during the injection molding process.

[0060] In a specific example, the assembly method further includes step S5. Figure 9 and Figure 8 , when the valve needle 120 closes the glue injection port 131, adjust the position of the needle valve adjustment part 40 in the adjustment hole 33 of the piston disc 30. When the valve needle 120 closes the glue injection port 131, the position of the needle valve adjustment part 40 in the adjustment hole 33 of the piston disc 30 can be accurately adjusted. This adjustment method ensures the sealing of the valve needle 120 in the closed state, and at the same time provides an accurate reference position for the subsequent installation of the sealing part 70 and the tensioning part 80, effectively avoiding the problem of valve needle 120 activity deviation caused by inaccurate initial position. Specifically, this step combines the resistance rotation characteristics of the drive chamber 20 to optimize the layout of the drive flow path, reduce the impact of external interference on the adjustment process of the valve needle 120, and thus improve the stability and reliability of the overall needle valve drive device.

[0061] In a specific example, the assembly method further includes step S6. Figure 10 and Figure 8 After adjusting the needle valve adjustment member 40, a blocking member 70 is installed in the adjustment hole 33 of the piston disc 30. The blocking member 70 contacts the needle valve adjustment member 40 to limit the upward movement of the needle valve adjustment member 40 in the adjustment hole 33. The assembly method further includes step S7. After installing the blocking member 70, a tensioning member 80 is installed in the adjustment hole 33 of the piston disc 30. The tensioning member 80 passes through the blocking member 70 and is installed on the needle valve adjustment member 40. The tensioning member 80 limits the downward movement of the needle valve adjustment member 40 in the adjustment hole 33. The blocking member 70 is installed in the adjustment hole 33 of the piston disc 30, which can effectively limit the upward displacement of the needle valve adjustment member 40 in the adjustment hole 33 and ensure the positional stability of the needle valve adjustment member 40. The tensioning member 80 passes through the blocking member 70 and is connected to the needle valve adjustment member 40, further limiting the downward displacement of the needle valve adjustment member 40 in the adjustment hole 33, forming a two-way locking mechanism. This double locking method significantly improves the anti-vibration performance of the valve needle 120 in a high-frequency vibration environment, and avoids the problem of reduced sealing due to displacement of the needle valve adjustment member 40 during the injection molding process.

[0062] See Figure 11 and Figure 12, the embodiment of the present invention further discloses a valve needle adjustment tool 200, which is used for adjustment in the aforementioned steps S5, S6 and S7. The valve needle adjustment tool 200 includes a positioning kit 210 for positioning the drive chamber 20 and the piston disc 30, a blocking positioning sleeve 220 located at the axis of the positioning kit 210 for positioning the blocking member 70, and an adjustment knob 230 located at the axis of the blocking positioning sleeve 220 for adjusting the needle valve adjustment member 40 and the tensioning member 80. The positioning kit 210 includes a positioning disc 211, a plurality of shell positioning rods 212 that are adjustably arranged at eccentric positions of the positioning disc 211, and a piston positioning cylinder 213 that is adjustably arranged at the axial position of the positioning disc 211. The shell positioning rod 212 is used to position in the first positioning hole 28 of the drive chamber 20 (see Figure 9 ), the piston positioning sleeve 213 passes through the axial hole of the drive chamber 20 and is positioned in the positioning notch 34 of the piston disc 30. The upper end of the piston positioning sleeve 213 has an outer ring fixed end 214. When the outer ring fixed end 214 is fixed by the fixing handle 240, the relative position of the piston disc 30 and the drive chamber 20 is fixed. The blocking positioning sleeve 220 has a positioning end 221 located at the bottom and an inner ring fixed end 222 located at the top. The blocking positioning sleeve 220 passes through the axial hole of the piston positioning sleeve 213, with the positioning end 221 and the inner ring fixed end 222 exposed at both ends. The positioning end 221 of the blocking positioning sleeve 220 can be coupled to the second tool adjustment section 72 of the blocking member 70 located in the second axial hole 71. The inner ring fixed end 222 of the blocking positioning sleeve 220 can be fixed by the other end of the fixing handle 240, allowing the blocking member 70 to be fixed or adjusted. The shaft of the adjustment knob 230 is inserted into the axial hole of the blocking and positioning sleeve 220. The end of the adjustment knob 230 exposed at the lower end of the blocking and positioning sleeve 220 is an adjustment end 231. The adjustment end 231 of the adjustment knob 230, located at the lower end, can be coupled to either the first tool adjustment section 42 of the needle valve adjustment member 40 located in the first axial hole 41 or the third tool adjustment section of the tensioning member 80 located in the third axial hole 81.

[0063] Therefore, this specialized tool can simultaneously operate on the axial holes of the needle valve adjustment member 40, the blocking member 70, and the tensioning member 80, ensuring coaxial alignment and further improving adjustment accuracy and stability. Furthermore, step S7 of installing the tensioning member 80 involves tightening it to a preset torque value to provide a constant preload force, ensuring a locking effect. Step S5 is performed with the valve needle 120 closed with the injection port 131, ensuring adjustment accuracy.

[0064] In summary, the embodiment of the present invention optimizes the flow path layout through the resistance rotation design of the drive chamber 20, thereby reducing the risk of flow path interference; establishes a double locking mechanism through the sealing member 70 and the tightening member 80 such as a locking screw to fix the position of the valve needle 120, prevent the needle valve adjustment member 40 from moving up and down relative to the piston disc 30, and improve the sealing and adjustment accuracy; through modular design and positioning design, ensures the precise coordination between the various components and improves maintenance efficiency. The embodiment of the present invention solves the technical problems of easy displacement of the adjustable valve needle 120 and easy interference of the drive flow path through innovative structural design and locking mechanism, significantly improves the sealing, adjustment stability and maintenance efficiency, and is suitable for the field of high-precision injection molding.

[0065] 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 scope of protection of the present invention. Any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection requested by the present invention.

Claims

1. A needle valve drive device provided on a hot runner bracket, characterized in that: include: An aggregate bowl (10) having a limiting ring groove (11) provided on the outer side of the bowl mouth; A driving chamber (20) is provided on the aggregate bowl (10), the driving chamber (20) comprising a shell (21) and a bottom plate (22), the bottom opening of the shell (21) being closed by the bottom plate (22), and a second buckle groove (26) being provided on the inner side of the shell (21); the bottom plate (22) is axially limited by an elastic inner ring (60) buckled into the second buckle groove (26), and the shell (21) of the driving chamber (20) is formed to rotate with resistance relative to the aggregate bowl (10) by a plurality of axial limiting rods (50) having one end embedded in the limiting ring groove (11); the elastic inner ring (60) is located between the bottom plate (22) and the embedded end of the axial limiting rod (50); A piston disc (30) is accommodated in the housing (21), and the piston disc (30) has an adjustment hole (33) that passes through the upper sleeve (31) and the lower sleeve (32); A needle valve adjusting member (40) is rotatably mounted in the adjusting hole (33) and is used to connect to the valve needle (120); the blocking member (70) and the tensioning member (80) constitute a double locking mechanism for the needle valve adjusting member (40); The needle valve adjustment member (40) has a first axial hole (41), the blocking member (70) has a second axial hole (71), and the top surface of the tensioning member (80) is provided with a third axial hole (81); The drive chamber (20) is rotatable to adjust the spatial layout of the drive flow path interface (27), and the double locking mechanism achieves dynamic stabilization of the valve needle position through coaxial alignment of the first axial hole (41), the second axial hole (71) and the third axial hole (81); The upper shaft sleeve (31) protrudes from the top surface of the housing (21), and the lower shaft sleeve (32) protrudes from the bottom surface of the bottom plate (22).

2. The needle valve drive device according to claim 1, characterized in that: A micro pressure sensor is embedded in the piston disc (30) or the drive chamber (20) to monitor the valve needle sealing pressure in real time. The drive device is connected to an adaptive locking system. When the vibration frequency of the drive chamber (20) is detected to be greater than 100 Hz, the tensioning member (80) is automatically triggered to perform secondary locking, thereby forming a "perception-decision-execution" intelligent closed loop.

3. The needle valve driving device according to claim 1, characterized in that: The pre-tightening force of the elastic inner ring (60) compensates for thermal expansion in a high-temperature environment, thereby preventing sealing failure of the drive cavity (20).

4. The needle valve driving device according to claim 1, characterized in that: The aggregate bowl (10) has a bowl mouth for setting the drive chamber (20) on the top; the inner side of the shell (21) is provided with a first buckle groove (23) for buckling the edge of the bottom plate (22), and the side wall of the drive chamber (20) is provided with a plurality of lock holes (24) between the first buckle groove (23) and the bottom opening; the axial limiting rod (50) is connected to the lock hole (24), and one end of the axial limiting rod (50) protrudes from the lock hole (24) and stops at the limiting ring groove (11) to prevent the aggregate bowl (10) from falling out.

5. The needle valve driving device according to claim 4, characterized in that: An air expansion groove (25) is further provided on the inner side of the shell (21), the bottom plate (22) is arranged between the air expansion groove (25) and the second buckle groove (26), the second buckle groove (26) is located between the first buckle groove (23) and the lock hole (24), and the bowl mouth of the aggregate bowl (10) contacts the elastic inner ring (60).

6. The needle valve driving device according to claim 5, characterized in that: The driving flow path interface (27) is opened on the top surface of the shell (21) or on the bottom plate (22) on the side of the shell (21).

7. The needle valve driving device according to claim 5, characterized in that: The upper surface of the housing (21) is provided with a first positioning hole (28), and the upper sleeve (31) is provided with a positioning notch (34) for the valve needle adjustment tool (200) to cooperate with and position.

8. The needle valve driving device according to claim 1, wherein: The blocking member (70) is installed in the adjustment hole (33) of the piston disc (30) and directly contacts the needle valve adjustment member (40) to prevent the needle valve adjustment member (40) from moving upward under injection pressure or vibration, thereby avoiding sealing failure of the valve needle (120) due to displacement, and achieving a valve needle position error of less than 0.02 mm; the tensioning member (80) is specifically a reverse locking screw, and the tensioning member (80) is located in the adjustment hole (33) of the piston disc (30). The tensioning member (80) passes through the blocking member (70) and is installed on the needle valve adjustment member (40) to limit the descent of the needle valve adjustment member (40) in the adjustment hole (33); The first axial hole (41) has a first tool adjustment section (42) and a connecting section (43) for connecting with the tensioning member (80); the second axial hole (71) has a second tool adjustment section (72) and a through hole section (73) for the tensioning member (80) to pass through; and the third axial hole (81) has a third tool adjustment section.

9. An assembly method of a needle valve drive device provided on a hot runner bracket according to claim 1, characterized in that: The following steps are involved: S1, fixing the collecting bowl (10) on the hot runner bracket (110); S2, assembling the drive chamber (20) and the piston disc (30), wherein the housing (21) of the drive chamber (20) has a bottom opening, the piston disc (30) is accommodated in the housing (21), and the piston disc (30) has an upper shaft sleeve (31) and a lower shaft sleeve (32) located at the axis, and an adjustment hole (33) passing through the upper shaft sleeve (31) and the lower shaft sleeve (32); the bottom plate (22) of the drive chamber (20) is combined with the bottom opening; S3, arranging the driving chamber (20) on the collecting bowl (10), wherein the housing (21) of the driving chamber (20) rotates with resistance relative to the collecting bowl (10); S4. Adjustably install the needle valve adjusting member (40) in the adjusting hole (33) of the piston disc (30), wherein the needle valve adjusting member (40) is pre-combined with one end of the valve needle (120).

10. The assembly method according to claim 9, characterized in that: Also includes: S5. When the needle valve closes the glue injection port (131), adjust the position of the needle valve adjustment member (40) in the adjustment hole (33) of the piston disc (30); S6. After adjusting the needle valve adjusting member (40), installing a blocking member (70) in the adjusting hole (33) of the piston disc (30), wherein the blocking member (70) contacts the needle valve adjusting member (40) to limit the upward movement of the needle valve adjusting member (40) in the adjusting hole (33); S7. After installing the blocking member (70), install a tensioning member (80) in the adjustment hole (33) of the piston disc (30). The tensioning member (80) passes through the blocking member (70) and is installed to the needle valve adjustment member (40). The tensioning member (80) limits the descent of the needle valve adjustment member (40) in the adjustment hole (33).

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