An adjustable needle valve drive device for a hot runner and an assembly method thereof

Abstract

The field of the present invention relates to a needle valve driving device in a hot runner system. The present invention discloses an adjustable needle valve driving device for a hot runner and an assembly method thereof. The device includes an aggregate bowl, a driving cavity, a piston disc and a needle valve adjusting member. The housing of the driving cavity is rotatable with resistance relative to the aggregate bowl to adjust the routing of the driving flow path on the hot runner bracket and can adjust the valve needle closing degree. By setting structures such as an adjustment hole, a first buckle groove, a limit ring groove and an axial limiting rod, etc., the stable assembly of the device and the adjustability of the lifting position of the valve needle and the routing of the driving flow path can be ensured. In a specific example, the combination of a first positioning hole, a positioning notch, a sealing member and a tensioning member can also solve the problems of difficult adjustment of the position of the needle valve adjusting member and the movable displacement under the rotational characteristics of the driving cavity. The present invention optimizes the structural design of the adjustable needle valve driving device in the hot runner system, improves the assembly flexibility and reliability, and at the same time facilitates the precise adjustment of the valve needle height and the maintenance of the driving flow path routing.

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 particularly relates to a hot runner adjustable needle valve drive device and an assembly method thereof. Background Art

[0002] In recent years, the hot runner technology field of injection molding machines has developed rapidly. Especially in the aspect of injection molding switch drive, the application of pneumatic needle valves has become increasingly widespread. This technology is mainly divided into two types: the valve needle length can be adjusted and cannot be adjusted. For the non-adjustable type of valve needle, the tip is worn due to long-term use, and it is easy to have the problem of not being able to close tightly. Although the adjustable type of valve needle can overcome the influence of tip wear, in actual applications, the problem of the movement deviation of the valve needle relative to the piston disk is significant. Especially in high-frequency vibration and high-temperature environments, this deviation will lead to a decrease in sealing performance and system stability. In addition, with the improvement of 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 numerous and the wiring complex. This not only increases the maintenance difficulty but also easily causes the flow path to break due to external force pulling during the adjustment process.

[0003] The invention patent publication number CN101314253A discloses a hot runner device for injection molding, including a manifold plate having a runner for resin movement required for injection molding, a needle valve type nozzle part provided with a gate for injecting the resin in the runner into the mold, a valve needle for opening and closing the gate, a piston and a cylinder for driving the valve needle, a position adjustment mechanism for moving the cylinder relative to the manifold plate to adjust the position of the valve needle; and a nozzle adjustment mechanism for applying an adjustment force to the needle valve type nozzle part in the cross-sectional direction of the manifold plate protruding toward the needle valve type nozzle part. This prior art realizes that the length of the valve needle and the gate position can be adjusted for the mold in the installed state through the nozzle adjustment mechanism for longitudinally adjusting the valve needle position and the position adjustment mechanism for horizontally adjusting the gate position, avoiding the formation of gate flash. In the related art, only adjusting screws are used to adjust the valve needle position. With the complication of the drive flow path layout, the problem of flow path interference cannot be solved. And there is a phenomenon of the movable deviation of the adjustable valve needle during the injection molding process after the valve needle position is adjusted due to mechanical vibration.

[0004] The applicant disclosed a needle valve hot runner system in the invention patent publication number CN207772313U, including a valve needle, a hot runner plate, a drive device and a heater. The valve needle outer sleeve is provided with a valve needle bushing that can be adjusted along the axial direction of the valve needle. 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 valve needle moves back and forth and generates friction with the valve needle bushing, 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, so that the gap between the valve needle bushing and the valve needle is reduced, thereby ensuring the sealing performance at the valve needle bushing. This method is 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.

[0005] Therefore, those skilled in the art are aware that there are existing solutions for the drive chamber that adjusts the lifting position of the valve needle in the prior art. For example, a threaded adjustment locking structure is used to fix the valve needle position, but the single locking structure lacks dynamic stability and is easy to loosen under vibration or pressure fluctuations, that is, the adjustable vibration resistance is insufficient; even if a one-way mechanical locking mechanism (such as a buckle or a 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 a high temperature environment, it is easy to fail; and the non-adjustable needle valve drive device that rigidly connects the drive chamber and the aggregate bowl, although it can provide a certain stability, it is necessary to disassemble the mold when adjusting the valve needle, which has low maintenance efficiency and is easy to damage the flow path. The adjustable and non-adjustable structures are not technically compatible.

[0006] On the one hand, the adjustable needle valve drive device is difficult to maintain stability after adjustment, which affects the sealing during the injection molding process; on the other hand, the layout of the drive flow path is complex, and it is very easy to cause the flow path to break due to external interference when adjusting the valve needle. At the same time, the traditional locking mechanism is 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 layout of the drive flow path has become a key issue that needs to be solved urgently. Summary of the invention

[0007] The first main purpose of the present invention is to overcome the above technical problems and provide a hot runner adjustable needle valve drive device.

[0008] The second main purpose of the present invention is to provide a hot runner adjustable needle valve drive device. 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 highly adjusted valve needle obtains a double locking mechanism. The valve needle is not prone to activity deviation after adjustment, thereby solving the problem of weak vibration resistance of the adjustable valve needle.

[0009] The third main object of the present invention is to provide an assembly method for a hot runner adjustable needle valve driving device, for manufacturing a needle valve driving device with adjustable valve needle height and driving flow path routing, and the valve needle will not generate movement deviation due to vibration after adjustment.

[0010] The first main object of the present invention is achieved through the following technical solutions:

[0011] A hot runner adjustable needle valve driving device is proposed, including:

[0012] An aggregate bowl, which is used to be fixedly arranged on the hot runner bracket to collect the overflowed plastic;

[0013] A driving cavity, which is arranged on the aggregate bowl. The driving cavity includes a housing with a bottom opening and a bottom plate combined with the bottom opening;

[0014] A piston disk, which is accommodated in the housing. The piston disk has an upper shaft sleeve and a lower shaft sleeve located at the axis and an adjustment hole penetrating through the upper shaft sleeve and the lower shaft sleeve;

[0015] A needle valve adjustment part, which is adjustably installed in the adjustment hole of the piston disk, and the needle valve adjustment part is used to connect one end of the valve needle;

[0016] Wherein, the housing of the driving cavity is rotatable with resistance relative to the aggregate bowl.

[0017] By adopting the above basic device technical solution, by using the fact that the housing of the driving cavity rotates with resistance relative to the aggregate bowl, when the aggregate bowl is fixedly combined with the hot runner bracket, the driving cavity rotates with resistance to adjust the routing of the driving flow path on the hot runner bracket, reduce the mutual interference between the driving flow paths, and optimize the overall layout of the driving flow path on the hot runner bracket. Because the housing of the driving cavity rotates with resistance relative to the aggregate bowl, the routing of the driving flow path can be flexibly adjusted on the hot runner bracket, effectively reducing the risk of mutual interference between the driving flow paths. At the same time, this valve needle adjustable driving device provides convenience for subsequent adjustment and maintenance. It not only avoids the problem that the traditional non-adjustable valve needle needs to disassemble the mold when the valve needle needs to be adjusted under the rigid connection structure, but also solves the problem that the driving device of the traditional adjustable valve needle has low efficiency and inconvenient operation in valve needle height adjustment and position maintenance due to valve needle vibration offset and driving flow path routing interference.

[0018] In a preferred embodiment, the present invention can be further configured as follows: The aggregate bowl has a bowl opening, above which the drive cavity is arranged. The aggregate bowl is provided with a limiting ring groove on the outer side of the bowl opening. An inner side of the housing is provided with a first fastening groove for fastening an edge of the bottom plate. A plurality of locking holes are formed in a side wall of the drive cavity between the first fastening groove and a bottom opening. The hot runner adjustable needle valve driving device further includes: a plurality of axial limiting rods connected in the locking holes, and one end of each axial limiting rod protrudes from the locking hole and is fixed in the limiting ring groove to prevent the aggregate bowl from coming off.

[0019] By adopting the above preferred technical features, a plurality of axial limiting rods are connected in the locking holes and one end of each axial limiting rod protrudes from the locking hole and is fixed in the limiting ring groove, so as to realize the resistant rotation of the drive cavity housing relative to the aggregate bowl and prevent the separation between the drive cavity housing and the aggregate bowl, thereby optimizing the routing of the drive flow path and reducing the risk of routing interference. This structure is a specific example for realizing "resistant rotation", which significantly improves the structural stability and maintenance convenience of the device. In a variant example, the "resistant rotation" characteristic can also be achieved by using a combination of other known mechanical structures.

[0020] In a preferred embodiment, the present invention can be further configured as follows: An inner side of the housing is further provided with an air expansion groove. The bottom plate is arranged between the air expansion groove and the second fastening groove. The second fastening groove is located between the first fastening groove and the locking holes. The hot runner adjustable needle valve driving device further includes: an elastic inner ring fastened into the second fastening groove to prevent the bottom plate from coming off, and the bowl opening abuts against the elastic inner ring.

[0021] By adopting the above preferred technical features, the elastic inner ring is fastened into the second fastening groove. At the same time, it effectively prevents the bottom plate from coming out of the housing. The bowl opening of the aggregate bowl abuts against the elastic inner ring, ensuring the stability of the drive cavity itself, so as to facilitate the arrangement of the drive cavity above the aggregate bowl.

[0022] In a preferred embodiment, the present invention can be further configured as follows: A plurality of drive flow path interfaces are formed on a top surface of the housing; alternatively, a plurality of drive flow path interfaces are formed on a side surface of the housing through the bottom plate.

[0023] By adopting the above preferred technical features, the positions of the drive flow path interfaces are set on the top surface of the drive cavity housing or the side surface of the bottom plate according to actual requirements, so as to optimize the layout of the drive flow path, effectively reduce the mutual interference between the drive flow paths, and improve the space utilization rate and assembly convenience of the device. Specifically, setting the interfaces on the top surface is beneficial to the connection of the flow paths in the vertical direction, while setting the interfaces on the side surface is more suitable for the layout adjustment in the horizontal direction, so as to meet the design requirements of the hot runner molds of different injection molding machines.

[0024] In a preferred embodiment, the present invention can be further configured as follows: a first positioning hole is provided on the upper surface of the housing, and a positioning notch is provided on the upper shaft sleeve. Under the multiple positioning of the valve needle adjustment tool, the technical problem that the housing of the driving cavity 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 disc is solved.

[0025] By adopting the above preferred technical features, the first positioning hole provided on the upper surface of the housing and the positioning notch provided on the upper shaft sleeve of the piston disc are used for cooperative positioning. The first positioning hole prevents the arbitrary rotation of the driving cavity housing, and the positioning notch prevents the arbitrary rotation of the piston disc, which can effectively solve the problem that it is difficult to accurately adjust the relative position between the needle valve adjustment part and the adjustment hole of the piston disc while the driving cavity housing has a resistance rotation characteristic. Specifically, the cooperation of the first positioning hole and the positioning notch provides a clear alignment reference during the valve needle assembly process, ensuring the accuracy of the installation and adjustment of the needle valve adjustment part, thereby improving the assembly efficiency and reliability of the overall needle valve driving device.

[0026] In a preferred embodiment, the present invention can be further configured as follows: a second positioning hole is provided on the lower surface of the bottom plate.

[0027] By adopting the above preferred technical features, the second positioning hole provided on the lower surface of the bottom plate can cooperate with the first positioning hole of the housing for positioning, so that the bottom plate can better seal the bottom opening of the housing to complete the pre-assembly of the driving cavity with a resistance rotation characteristic and the piston disc. When the driving cavity is installed above the aggregate bowl, the contact form between the peripheral edge of the lower surface of the bottom plate and the upper surface of the elastic inner ring increases the resistance of the driving cavity housing during rotation, and a delay resistance of non-synchronous rotation can be formed between the periphery of the bottom plate and the driving cavity housing.

[0028] In a preferred embodiment, the present invention can be further configured as follows: the hot runner adjustable needle valve driving device further includes:

[0029] A plugging member, installed in the adjustment hole of the piston disc, for plugging the upward movement of the needle valve adjustment part in the adjustment hole;

[0030] A tensioning member, located in the adjustment hole of the piston disc, the tensioning member passes through the plugging member and is installed on the needle valve adjustment part, for restricting the downward movement of the needle valve adjustment part in the adjustment hole.

[0031] By adopting the above-mentioned preferred technical features, through the synergistic action of the plugging member and the tensioning member, the tensioning member connects the plugging member and the needle valve adjusting member to form an integrally connected structure within the adjustment hole, achieving a dual restriction on the needle valve adjusting member that it cannot rise or fall within the adjustment hole. Specifically, the plugging member effectively prevents the upward displacement of the needle valve adjusting member caused by external forces or vibrations, while the tensioning member further restricts its downward movement by passing through the plugging member and connecting to the needle valve adjusting member, thereby ensuring the position stability of the needle valve adjusting member within the adjustment hole. This dual locking mechanism significantly improves the anti-vibration performance of the adjusted valve needle during the injection molding process, avoids the problem of decreased sealing performance of the injection port of the hot runner hose caused by displacement, simplifies the maintenance operation of the injection molding hot runner mold, and improves the reliability of the overall injection molding system.

[0032] In a preferred embodiment of the present invention, it can be further configured that: the needle valve adjusting member has a first shaft hole, and the first shaft hole has a first tool adjustment section and a connection section for the tensioning member to engage; the plugging member has a second shaft hole, and the second shaft 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 shaft hole of a third tool adjustment section; the first shaft hole, the second shaft hole, and the third shaft hole are aligned on the axis of the adjustment hole.

[0033] By adopting the above-mentioned preferred technical features, the precise coaxial installation of the three components is achieved through the alignment design of the shaft holes of the needle valve adjusting member, the plugging member, and the tensioning member. The specific effects are as follows:

[0034] 1. The connection section of the first shaft hole cooperates with the tensioning member to ensure the stable combination of the needle valve adjusting member and the tensioning member, preventing loosening;

[0035] 2. The through-hole section of the second shaft hole provides a penetration path for the tensioning member, and the precise installation of the plugging member is achieved through the second tool adjustment section before;

[0036] 3. The third shaft hole is arranged on the top surface of the tensioning member, which is convenient for using tools to adjust the tightening degree of the tensioning member to ensure uniform distribution of the pre-tightening force;

[0037] 4. The shaft holes of the three components are aligned on the same axis, and a positioning kit of the same set of valve needle adjustment tools can be used, effectively avoiding stress concentration caused by eccentricity during the installation process, and improving the stability and reliability of the overall structure.

[0038] The second main object of the present invention is achieved through the following technical solutions:

[0039] A hot runner adjustable needle valve driving device is proposed, including:

[0040] An aggregate bowl, fixedly arranged on the hot runner bracket, and a limiting ring groove is arranged on the outer side of the bowl mouth;

[0041] The drive chamber is arranged on the aggregate bowl and includes a housing and a bottom plate. The bottom opening of the housing is closed by the bottom plate, and an air expansion groove and a second buckle groove are formed inside the housing.

[0042] The piston disk is accommodated in the housing and has an adjustment hole penetrating through its axis.

[0043] The needle valve adjuster is rotatably installed in the adjustment hole and is used to connect the valve needle.

[0044] The elastic inner ring is buckled into the second buckle groove to prevent the bottom plate from coming out.

[0045] A plurality of axial limiting rods, one end of which is embedded and connected to the lock hole on the side wall of the housing, and this end also protrudes and locks in the limiting ring groove, so that the housing of the drive chamber rotates with resistance relative to the aggregate bowl.

[0046] The plugging member is installed in the adjustment hole to limit the upward movement of the needle valve adjuster.

[0047] The tensioning member passes through the plugging member and is connected to the needle valve adjuster to limit the downward movement of the needle valve adjuster.

[0048] Wherein, the first shaft hole of the needle valve adjuster, the second shaft hole of the plugging member and the third shaft hole of the tensioning member are coaxially aligned to form a double locking mechanism.

[0049] By adopting the above technical solution of the basic device, the above technical solution achieves the following remarkable technical effects:

[0050] 1. Regarding the "rotation with resistance" design of the drive chamber, it has the effects of optimizing the drive flow path layout and operation 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 caused by wire routing interference of multiple drive flow paths; one end of the axial limiting rod is embedded and connected to the lock hole of the housing, and this end also protrudes and locks in the limiting ring groove of the aggregate bowl, allowing the drive chamber to rotate in the XY plane to adjust the drive flow path layout, preventing accidental displacement during rotation through frictional resistance, ensuring the stable position of the adjusted flow path, and also limiting the Z-direction separation between the drive chamber and the aggregate bowl.

[0051] 2. Regarding the double locking mechanism, there is a mechanism with a plug restricting upward movement, a tensioning member restricting downward movement, and coaxial alignment of the three-axis holes; the plug is installed in the piston disk adjustment hole and directly abuts against the needle valve adjustment member to prevent it from moving upward under injection pressure or vibration, avoiding seal failure caused by the displacement of the valve needle; the tensioning member (specifically, a reverse lock screw) penetrates through the plug and is connected to the needle valve adjustment member, restricting the downward movement of the needle valve adjustment member through the pre-tightening force of the thread, eliminating the risk of sinking caused by gravity or mechanical vibration; the first shaft hole of the needle valve adjustment member, the second shaft hole of the plug, and the third shaft hole of the tensioning member are coaxially aligned to ensure uniform distribution of the locking force, avoid local wear caused by eccentric stress, and improve the anti-vibration performance (the anti-vibration performance is improved by more than 60% compared with the combination of single threads).

[0052] 3. Regarding the aspect of modular maintenance advantages, it can be quickly disassembled and assembled; the elastic inner ring is snapped into the second buckle groove of the housing, and combined with the locking of the axial limiting rod, the drive cavity and the aggregate bowl form a modular connection. During maintenance, only the axial limiting rod needs to be released to separate the drive cavity, without disassembling the mold, and the maintenance efficiency is increased by 50%.

[0053] 4. Regarding the function of the air expansion groove, it has the effect of improving the sealing degree and durability; the air expansion groove on the inner side of the housing optimizes the distribution of the driving air flow. Even when the piston disk drops to the bottom dead center and contacts the bottom plate, the air pressure below the piston disk can be maintained due to the setting of the air expansion groove, reducing the vibration interference of the air flow impact on the piston disk. At the same time, the pre-tightening force of the elastic inner ring compensates for the thermal expansion in the high-temperature environment, avoiding seal failure of the drive cavity.

[0054] The third main object of the present invention is achieved through the following technical solutions:

[0055] A method for assembling a hot runner adjustable needle valve driving device is proposed, including the following steps:

[0056] S1. Fix the aggregate bowl on the hot runner bracket;

[0057] S2. Assemble the drive cavity and the piston disk. The housing of the drive cavity has a bottom opening, the piston disk is accommodated in the housing, and the piston disk has an upper shaft sleeve and a lower shaft sleeve at the center and an adjustment hole penetrating through the upper shaft sleeve and the lower shaft sleeve; the bottom plate of the drive cavity is combined with the bottom opening;

[0058] S3. Set the drive cavity on the aggregate bowl, and the housing of the drive cavity is rotationally resistant relative to the aggregate bowl;

[0059] S4. Adjustably install the needle valve adjustment member in the adjustment hole of the piston disk, and one end of the valve needle is pre-combined with the needle valve adjustment member.

[0060] By adopting the above basic method technical solution, an assembly method capable of effectively solving the problems of adjustable valve needle movement deviation and driving flow path interference is achieved. The specific effects are as follows:

[0061] 1. By fixedly installing the aggregate bowl on the hot runner bracket, the basic stability of the entire driving device is ensured, and additional vibration or displacement problems caused by unstable installation are avoided;

[0062] 2. By placing the piston disk in the driving cavity housing and combining the bottom plate to seal the bottom opening, a closed and stable internal driving environment is formed, providing guarantee for the precise installation and adjustment of the subsequent needle valve adjuster and optimizing the internal structure layout;

[0063] 3. By setting the driving cavity on the aggregate bowl and making the driving cavity housing rotate with resistance relative to the aggregate bowl, the routing of the driving flow path is effectively optimized, the risk of flow path pulling or breaking caused by external operation or environmental factors is reduced, and the reliability of the overall hot runner system is enhanced;

[0064] 4. By adjustably installing the needle valve adjuster in the adjustment hole of the piston disk and combining it with one end of the valve needle, the needle valve driving device is installed first, and then the position of the valve needle is controlled, improving the sealing performance of the injection port and the flow control accuracy during the injection molding process.

[0065] In a preferred example of the present invention, it can be further configured that: the assembly method further includes:

[0066] S5. When the needle valve closes the injection port, adjust the position of the needle valve adjuster in the adjustment hole of the piston disk.

[0067] By adopting the above preferred technical features, when the valve needle closes the injection port, the position of the needle valve adjuster in the adjustment hole of the piston disk can be accurately adjusted. This adjustment method ensures the sealing performance of the valve needle in the closed state, and at the same time provides an accurate reference position for the subsequent installation of the plugging member and the tensioning member, effectively avoiding the problem of valve needle movement deviation caused by inaccurate initial position. Specifically, this step combines the resistance rotation characteristic of the driving cavity to optimize the layout of the driving flow path and reduce the influence of external interference on the valve needle adjustment process, thereby improving the stability and reliability of the overall needle valve driving device.

[0068] In a preferred example of the present invention, it can be further configured that: the assembly method further includes:

[0069] S6. After adjusting the needle valve adjuster, install a plugging member in the adjustment hole of the piston disk, and the plugging member abuts against the needle valve adjuster to limit the upward movement of the needle valve adjuster in the adjustment hole;

[0070] S7. After installing the plugging member, install the tensioning member in the adjustment hole of the piston disc. The tensioning member passes through the plugging member and is installed on the needle valve adjusting member, and the tensioning member restricts the downward movement of the needle valve adjusting member in the adjustment hole.

[0071] By adopting the above preferred technical features, the plugging member is installed in the adjustment hole of the piston disc, which can effectively limit the upward displacement of the needle valve adjusting member in the adjustment hole and ensure the position stability of the needle valve adjusting member; the tensioning member passes through the plugging member and is connected to the needle valve adjusting member, further restricting the downward displacement of the needle valve adjusting member in the adjustment hole, forming a two-way locking mechanism. This double-locking method significantly improves the anti-vibration performance of the valve needle in a high-frequency vibration environment and avoids the problem of reduced sealing performance caused by the displacement of the needle valve adjusting member during the injection molding process.

[0072] In summary, the present invention includes at least one of the following technical effects that contribute to the prior art:

[0073] 1. The driving cavity is rotatably connected with the aggregate bowl through an axial limiting rod with resistance, optimizing the layout of the driving flow path, significantly reducing the risk of interference in the driving flow path, and at the same time avoiding the problem of flow path breakage caused by external force pulling during the height adjustment of the valve needle.

[0074] 2. The needle valve adjusting member adopts a double-locking mechanism of a plugging member and a tensioning member, effectively preventing the movement deviation of the valve needle in a high-frequency vibration and high-temperature environment, improving the sealing performance and stability of the hot runner system mold, and the anti-vibration performance is improved by more than 60%.

[0075] 3. The modular design of the needle valve driving device makes the maintenance operation more convenient. The height position of the valve needle can be quickly adjusted without disassembling the mold, and the overall maintenance time is shortened by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 A three-dimensional schematic diagram showing a hot runner adjustable needle valve driving device according to an embodiment of the present invention;

[0077] Figure 2 A component exploded view of the driving device;

[0078] Figure 3 A cross-sectional schematic diagram of the driving device;

[0079] Figure 4 A block diagram showing the assembly process of a hot runner adjustable needle valve driving device according to an embodiment of the present invention;

[0080] Figure 5 Showing Figure 2 A schematic diagram of the fixed setting of the aggregate bowl in (corresponding to step S1, (A) is a half-sectional three-dimensional view, (B) is a cross-sectional view);

[0081] Figure 6 Illustrated Figure 2 Schematic diagram of the assembly of the drive chamber and the piston disc (corresponding to step S2, (A) is a half-section three-dimensional view, (B) is a sectional view);

[0082] Figure 7 Illustrated Figure 2 Schematic diagram of the connection between the drive chamber and the aggregate bowl (corresponding to step S3, (A) is a half-section three-dimensional view, (B) is a sectional view);

[0083] Figure 8 Illustrated Figure 2 Schematic sectional view of the installed needle valve adjusting part in the piston disc (corresponding to step S4);

[0084] Figure 9 Illustrated Figure 2 Schematic diagram of adjusting the needle valve adjusting part in the adjusting hole of the piston disc by using the needle valve adjusting tool (corresponding to step S5);

[0085] Figure 10 Illustrated Figure 2 Schematic three-dimensional view of the installation of the sealing part and the tensioning part in the piston disc (corresponding to step S6 and step S7);

[0086] Figure 11 Illustrated Figure 9 Schematic three-dimensional view of the used needle valve adjusting tool;

[0087] Figure 12 Illustrated Figure 9 Exploded view of the components of the used needle valve adjusting tool;

[0088] Figure 13 Illustrated is the top view of the hot runner adjustable needle valve drive device in the adjusted state (corresponding to steps S5 to S7).

[0089] Reference numerals: 110, hot runner bracket; 120, valve pin; 130, hot runner hose; 131, glue injection port; 132, glue injection pipeline; 200, valve pin adjustment tool; 210, positioning kit; 211, positioning disk; 212, housing positioning rod; 213, piston positioning cylinder; 214, outer ring fixed end; 220, plugging positioning sleeve; 221, positioning end; 222, inner ring fixed end; 230, adjustment handle; 231, adjustment end; 240, fixed handle; 10, aggregate bowl; 11, limit ring groove; 12, chassis; 13, sheath; 14, bottom cover; 20, drive cavity; 21, housing; 22, bottom plate; 23, first buckle groove; 24, lock 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 shaft sleeve; 32, lower shaft sleeve; 33, adjustment hole; 34, positioning notch; 40, needle valve adjustment part; 41, first shaft hole; 42, first tool adjustment section; 43, connection section; 50, axial limit rod; 60, elastic inner ring; 70, plugging part; 71, second shaft hole; 72, second tool adjustment section; 73, through hole section; 80, tensioning part; 81, third shaft hole. Detailed implementation manners

[0090] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments for understanding the inventive concept of the present invention, and cannot represent all the embodiments, nor are they the only embodiments for explanation. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art under the premise of understanding the inventive concept of the present invention belong to the scope of protection of the present invention.

[0091] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. For the convenience of understanding the technical solutions 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 the scope of protection defined by the present invention. Existing adjustable valve pin driving devices have problems such as easy displacement of the valve pin height after adjustment and complex routing of the drive flow path leading to interference. The traditional locking structure is single and cannot adapt to high-frequency vibration and high-temperature environments, resulting in poor sealing and low maintenance efficiency. Therefore, the present invention mainly adopts the following solutions to achieve the effects of optimizing the flow path layout through the resistance rotation design of the drive cavity and fixing the position of the valve pin through the double locking mechanism of the plugging part and the anti-lock screw. The following is a further detailed description of the present invention.

[0092] The "rotation with resistance" proposed in the present invention refers to the rotational characteristics between the drive chamber shell and the aggregate bowl achieved through the synergistic effect of mechanical limiting and friction resistance. Specifically, the drive chamber shell rotates under the torsion of an artificial external force to change the arrangement position of the drive flow path interface on the hot runner bracket. When the external force is released, the drive chamber shell stops rotating and will not continue to rotate. In this way, dynamic adjustment and static stability are taken into account, which not only allows the drive chamber to rotate to meet the needs of complex flow path layouts, but also ensures the stability of the adjusted position through resistance design, solving the contradiction between traditional rigid connection (unable to adjust) and free rotation (easy to deviate).

[0093] Figure 1 A three-dimensional schematic diagram of a hot runner adjustable needle valve driving device according to an embodiment of the present invention is shown; Figure 2 An exploded view of the components of the device; Figure 3 A cross-sectional schematic diagram of the 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. Figure 8 , Figure 10 and Figure 13 As shown, multiple hot runner adjustable needle valve driving devices are integrally installed on the hot runner bracket 110, and are used in the hot runner system mold to drive the valve needle 120 to rise and fall, so as to open and close the injection molding of the injection molding machine. Under the requirements of the new generation of production processes, the hot runner adjustable needle valve driving device is required to be able to drive the injection port 131 to open and close more accurately without being affected by the wear of the valve needle 120. Usually, the valve needle 120 is installed in the hot runner hose 130, and driven by the hot runner adjustable needle valve driving device, it can close the injection port 131 of the hot runner hose 130 as an outlet, and the injection rubber in the hot runner hose 130 is introduced by the injection line 132. The hot runner hose 130 has thermal conductivity and can heat the injection rubber inside; after heating, the injection rubber is led out from the injection port 131 and enters the injection mold (not shown in the figure), and then 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 increased number of valve needles 120. How to make 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 continuous research.

[0094] Reference Figure 1 , Figure 2 and Figure 3, in the device embodiment of the present invention, a hot runner adjustable needle valve driving device is proposed, including: an aggregate bowl 10 fixedly arranged on a hot runner bracket 110 to collect overflowing injection plastic material, a driving cavity 20 arranged on the aggregate bowl 10 to provide a driving space for a valve needle 120, a piston disk 30 accommodated in the driving cavity 20 and arranged in a housing 21 to drive the valve needle 120 to switch and lift, and a needle valve adjusting part 40 adjustably installed in an adjusting hole 33 of the piston disk 30 to be combined with one end of the valve needle 120. Among them, the driving cavity 20 includes a housing 21 with a bottom opening and a bottom plate 22 combined with the bottom opening; the piston disk 30 has an upper bushing 31 and a lower bushing 32 at the axis and an adjusting hole 33 penetrating through the upper bushing 31 and the lower bushing 32; wherein, the housing 21 of the driving cavity 20 is rotatable with resistance relative to the aggregate bowl 10, realizing a stable connection between the driving cavity 20 and the aggregate bowl 10, and at the same time facilitating the adjustment of the layout of the driving flow path, achieving the purpose of optimizing the routing of the driving flow path.

[0095] In this embodiment, refer to Figure 2 and Figure 3 , a method for fixedly combining the aggregate bowl 10 with the hot runner bracket 110 is as follows. The aggregate bowl 10 includes a bowl body with an upwardly enlarged opening, a receiving hole is opened in the center of the bottom of the bowl body, a chassis 12 is installed on the receiving hole, the periphery of the chassis 12 buckles the receiving hole of the bowl body, the chassis 12 is installed on the hot runner bracket 110 through an outer connecting rod, a sheath 13 and a bottom cover 14 are arranged above the chassis 12, and the bottom cover 14 is combined with the chassis 12 through an inner connecting rod to clamp the sheath 13. A converging protective tube extends from the bottom of the sheath 13, passes through the chassis 12 until the valve hole of the hot runner bracket 110, and the sheath 13 can protect the valve needle 120, reducing the injection plastic material carried out by the valve needle 120 and overflowing into the aggregate bowl 10. The bottom cover 14 protrudes from the bottom of the aggregate bowl 10 to help scrape off the injection plastic material adhering to the wall surface of the valve needle 120. The bottom of the chassis 12 has a downwardly protruding annular contour, which is closely attached to the surface of the hot runner bracket 110 to block the overflow of the injection plastic material. The sheath 13 is limited in the limited space between the chassis 12 and the bottom cover 14, and with the lifting movement of the valve needle 120, the sheath 13 presents a linkage with a limited stroke, which is beneficial to the scraping of the plastic material on the wall surface of the valve needle 120. The separation structure of the bottom cover 14, the sheath 13 and the chassis 12 is beneficial to blocking the heat transfer between the aggregate bowl 10 and the hot runner bracket 110, and the overflow amount of the injection plastic material in the aggregate bowl 10 will not be heated and solidified. Please refer to Figure 2 , the chassis 12 is provided with eight connection holes, four of which can be used for installing the outer connecting rod, two of which can be used for the combination of the inner connecting rod, and the remaining two can establish an overflow recovery path.

[0096] When the aggregate bowl 10 is fixedly coupled to the hot runner bracket 110, the drive cavity 20 is rotatable with resistance. The drive flow path interface 27 is provided in the drive cavity 20 and can be located at the top or side of the housing 21, so as to adjust the routing of the drive flow path connected to the drive flow path interface 27 on the hot runner bracket 110. That is, the rotation of the drive cavity 20 can change the relative position of the drive flow path interface 27 on the hot runner bracket 110, thereby reducing the mutual interference between the drive flow paths connected to the drive flow path interface 27, and thus optimizing the overall layout of the drive flow path on the hot runner bracket 110. In this embodiment, reference can be made to Figure 13 and Figure 3 , two drive flow path interfaces 27 are opened on the top surface of the housing 21. One of the drive flow path interfaces 27 is a downward pressure air port ( Figure 13 the drive flow path interface 27 located above in Figure 13 ), which communicates with the upper chamber in the drive cavity 20 above the piston disk 30. The other drive flow path interface 27 is an upward air port (

[0097] the drive flow path interface 27 located below in Figure 13 ), which communicates with the lower chamber in the drive cavity 20 below the piston disk 30. Different fluid pressures are introduced into the two drive flow path interfaces 27, giving different pressure differences between the upper chamber and the lower chamber of the piston disk 30, so that the piston disk 30 moves downward (the valve pin 120 is closed) or the piston disk 30 moves upward (the valve pin 120 is opened). In a variant, the two drive flow path interfaces 27 are opened on the side of the drive cavity 20, specifically, they can be opened on the bottom plate 22 of the drive cavity 20. The rotation of the drive cavity 20 can also change the relative position of the drive flow path interface 27 on the hot runner bracket 110. Specifically, setting the interface on the top surface is beneficial for the connection of the flow path in the vertical direction, while setting the interface on the side is more suitable for the layout adjustment in the horizontal direction, so as to meet the design requirements of the hot runner mold of different injection molding machines.

[0098] The so-called "resisted rotation" is specifically structured in the present embodiment as follows. The aggregate bowl 10 has a bowl opening with an enlarged upward opening size, and the drive cavity 20 is arranged above it. The aggregate bowl 10 is provided with a limiting ring groove 11 on the outer side of the bowl opening. A first fastening groove 23 for fastening the edge of the bottom plate 22 is formed on the inner side of the housing 21, and a plurality of locking holes 24 are formed in the side wall of the drive cavity 20 between the first fastening groove 23 and the bottom opening. A plurality of axial limiting rods 50 are connected in the locking holes 24, and one end of the axial limiting rod 50 protrudes from the locking hole 24 and is fixed in the limiting ring groove 11 to prevent the aggregate bowl 10 from coming off. By connecting a plurality of axial limiting rods 50 in the locking holes 24 and having one end protruding from the locking hole 24 and fixed in the limiting ring groove 11, a multi-point mechanical constraint is formed to limit the free rotation of the drive cavity 20. Therefore, the aforementioned mechanical limiting structure realizes the resisted rotation of the housing 21 of the drive cavity 20 relative to the aggregate bowl 10 and prevents the separation of the housing 21 of the drive cavity 20 and the aggregate bowl 10, thereby optimizing the routing of the drive flow path and reducing the risk of routing interference. Thus, the characteristic of "resisted rotation" can be achieved, significantly improving the structural stability and maintenance convenience of the device. In a variant example, the characteristic of "resisted rotation" can also be achieved by combining other known mechanical structures. This resistance has an adjustable characteristic, and the magnitude of the rotational resistance is jointly determined by the pre-tightening force of the axial limiting rod 50, the material hardness of the elastic inner ring 60, and the dimensional tolerance of the limiting ring groove 11, ensuring that the drive cavity 20 can be rotated manually to adjust the flow path layout, but a certain external force (such as wrench torque) needs to be applied to avoid displacement caused by vibration or accidental touch. When the drive cavity 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 frictional resistance of the elastic inner ring 60 acting on the bowl opening of the aggregate bowl 10 (refer to Figure 3 ), to achieve position fixation without an additional locking device. The drive cavity 20 can rotate with resistance relative to the aggregate bowl 10, which not only ensures the stable connection between the two but also facilitates the adjustment of the layout of the drive flow path and reduces the risk of flow path interference.

[0099] In a specific example, referring again to Figure 3, an air expansion groove 25 and a second locking groove 26 are further formed inside the housing 21. The air expansion groove 25 defines the lower limit position of the plate body movement of the piston disc 30. The second locking groove 26 is for the installation of the elastic inner ring 60. The aforementioned first locking groove 23 is for the peripheral flange of the bottom plate 22 to be fastened. The bottom plate 22 is disposed between the air expansion groove 25 and the second locking groove 26, and the second locking groove 26 is located between the first locking groove 23 and the locking hole 24. The hot runner adjustable needle valve driving device further includes: an elastic inner ring 60, which is snapped into the second locking groove 26 to prevent the bottom plate 22 from coming out. The elastic inner ring 60 is specifically a metal elastic ring with a telescopic notch. Before compression, the outer diameter of the elastic inner ring 60 is larger than the inner diameter of the housing 21, and after compression, the outer diameter of the elastic inner ring 60 can be smaller than the inner diameter of the housing 21. The elastic inner ring 60 provides a pre-tightening force to install the elastic inner ring 60 in the second locking groove 26. The bowl mouth of the aggregate bowl 10 abuts against the elastic inner ring 60. By snapping the elastic inner ring 60 into the second locking groove 26, it effectively prevents the bottom plate 22 from coming out of the housing 21. The bowl mouth of the aggregate bowl 10 abuts against the elastic inner ring 60 to ensure the stability of the driving cavity 20 itself, so as to facilitate the driving cavity 20 to be disposed above the aggregate bowl 10.

[0100] In a specific example, referring again to Figure 1 and Figure 3 , a first positioning hole 28 is provided on the upper surface of the housing 21, and the upper shaft sleeve 31 is provided with a positioning notch 34. Under the multiple positioning of the valve needle adjustment tool 200, the technical difficulty that the housing 21 of the driving cavity 20 with a resistance rotation characteristic cannot adjust the relative position of the needle valve adjustment member 40 connected to the valve needle 120 in the adjustment hole 33 of the piston disc 30 is solved. That is to say, the inner side wall of the driving cavity 20 in this embodiment can be provided without a longitudinal guide groove for guiding the piston disc 30. Before the positioning of the positioning notch 34, for example, during the driving process of the valve needle 120, the piston disc 30 can rotate freely, the inner side wall of the driving cavity 20 can be smoothly provided, and the piston disc 30 can slide up and down better.

[0101] By using the cooperation of the first positioning hole 28 provided on the upper surface of the housing 21 and the positioning notch 34 provided on the upper shaft sleeve 31 of the piston disc 30 for positioning, for example, using a valve needle adjustment tool 200 as shown in Figure 11 and Figure 12 , during the valve needle height adjustment process, the first positioning hole 28 prevents any rotation of the housing 21 of the driving cavity 20, and the positioning notch 34 prevents any rotation of the piston disc 30, which can effectively solve the problem that it is difficult to accurately adjust the relative position between the housing 21 of the driving cavity 20 with a resistance rotation characteristic and the adjustment hole 33 of the piston disc 30 of the needle valve adjustment member 40. Specifically, the cooperation of the first positioning hole 28 and the positioning notch 34 provides a clear alignment reference during the assembly process of the valve needle 120, ensuring the accuracy of the installation and adjustment of the needle valve adjustment member 40, thereby improving the assembly efficiency and reliability of the overall needle valve driving device.

[0102] In a specific example, referring again to Figure 3 , a second positioning hole 29 is provided on the lower surface of the bottom plate 22. By using the second positioning hole 29 provided on the lower surface of the bottom plate 22, it can cooperate with the first positioning hole 28 of the housing 21 for positioning. Before assembling the drive cavity 20 and the aggregate bowl 10, the bottom plate 22 can better seal the bottom opening of the housing 21 to complete the pre-assembly of the drive cavity 20 with the piston disc 30 having a resistance rotation characteristic. When the drive cavity 20 is installed above the aggregate bowl 10, the contact form between the peripheral edge of the lower surface of the bottom plate 22 and the upper surface of the elastic inner ring 60 increases the resistance of the housing 21 of the drive cavity 20 during rotation, and a delay resistance of non-synchronous rotation can be formed between the periphery of the bottom plate 22 and the housing 21 of the drive cavity 20.

[0103] In a specific example, referring to Figure 1 、 Figure 2 and Figure 3 , the hot runner adjustable needle valve driving device further includes: a plugging member 70 for plugging the upward movement of the needle valve adjusting member 40 in the adjusting hole 33 and a tensioning member 80 for restricting the downward movement of the needle valve adjusting member 40 in the adjusting hole 33. The plugging member 70 is installed in the adjusting hole 33 of the piston disc 30. The needle valve adjusting member 40 has a fastening groove to fasten the tail end of the valve needle 120, and an external thread is provided on the outer side surface of the needle valve adjusting member 40 to be screwed into the adjusting hole 33 with an internal thread of the piston disc 30; the needle tip of the valve needle 120 is used to close the injection port 131 of the hot runner hose 130 (refer to Figure 8 ). On the other hand, an external thread is also provided on the outer side surface of the plugging member 70 to be screwed into the adjusting hole 33; the tensioning member 80 is located in the adjusting hole 33 of the piston disc 30, and the tensioning member 80 passes through the plugging member 70 and is installed and connected to the needle valve adjusting member 40. There may be no direct connection relationship between the tensioning member 80 and the adjusting hole 33 of the piston disc 30. The tensioning member 80 passes through the plugging member 70 and is connected to the needle valve adjusting member 40 to form a three-piece integrated connection structure in the adjusting hole 33, realizing the dual restrictions on the needle valve adjusting member 40 not to rise and not to fall in the adjusting hole 33.

[0104] Specifically, the plugging member 70 effectively prevents the upward displacement of the needle valve adjusting member 40 caused by external force or vibration, while the tensioning member 80 further restricts its downward movement by passing through the plugging member 70 and connecting to the needle valve adjusting member 40, thereby ensuring the position stability of the needle valve adjusting member 40 in the adjusting hole 33. This dual locking mechanism significantly improves the anti-vibration performance of the adjusted valve needle 120 during the injection molding process, avoids the problem of reduced sealing performance of the injection port 131 of the hot runner hose 130 caused by displacement, simplifies the maintenance operation of the injection molding hot runner mold, and improves the reliability of the overall injection molding system.

[0105] In a specific example, referring toFigure 2 With Figure 8 , the needle valve adjusting member 40 has a first shaft hole 41, the first shaft hole 41 has a first tool adjusting section 42 and a connection section 43 for engaging with the tensioning member 80, and the first shaft hole 41 is in a non-through form; the plugging member 70 has a second shaft hole 71, the second shaft hole 71 has a second tool adjusting section 72 and a through-hole section 73 for the tensioning member 80 to penetrate, and the second shaft hole 71 is in a through form; the top surface of the tensioning member 80 is provided with a third shaft hole 81 of a third tool adjusting section, and a connection section for connecting the needle valve adjusting member 40 is provided below the tensioning member 80; the first shaft hole 41, the second shaft hole 71 and the third shaft hole 81 are aligned with the axis of the adjusting hole 33. The precise coaxial installation of the three is achieved through the alignment design of the shaft holes of the needle valve adjusting member 40, the plugging member 70 and the tensioning member 80. In a preferred example, the first tool adjusting section 42 and the third tool adjusting section of the third shaft hole 81 can be the same to be adjusted by the same tool part (see Figure 11 With Figure 12 the adjusting end 231 of the adjusting handle 230 in); the second tool adjusting section 72 is larger than the first tool adjusting section 42 or larger than the third tool adjusting section to be adjusted by a larger tool part (see Figure 11 With Figure 12 the positioning end 221 of the plugging positioning sleeve 220 in). Therefore, in this structure, it is convenient to use the valve needle adjusting tool 200 with a single special tool to act on the shaft holes of the needle valve adjusting member 40, the plugging member 70 and the tensioning member 80, ensuring coaxial alignment, improving the adjustment efficiency and accuracy. In a specific example, the tensioning member 80 is a reverse lock screw, and its thread matches the connection section 43 of the needle valve adjusting member 40, so that the tensioning member 80 can effectively limit the descent of the needle valve adjusting member 40 and enhance the locking effect.

[0106] The specific effects of the previous feature combinations include:

[0107] 1. The first shaft hole 41 of the needle valve adjusting member 40 cooperates with the connection section of the tensioning member 80 to ensure the stable combination of the needle valve adjusting member 40 and the tensioning member 80 and prevent loosening;

[0108] 2. The through-hole section 73 of the second shaft hole 71 provides a through path for the tensioning member 80, and the precise installation of the plugging member 70 is achieved through the second tool adjusting section 72 before;

[0109] 3. The third shaft hole 81 is provided on the top surface of the tensioning member 80, which is convenient for using a tool to adjust the tightening degree of the tensioning member 80 to ensure uniform distribution of the pre-tightening force;

[0110] 4. The shaft holes of the three are aligned on the same axis, and the positioning kit of the same set of valve needle adjusting tools 200 can be used, effectively avoiding stress concentration caused by eccentricity during the installation process and improving the stability and reliability of the overall structure.

[0111] Referring to Figure 1 、 Figure 2 and Figure 3 , another embodiment of the present invention further provides a hot runner adjustable needle valve driving device, comprising:

[0112] An aggregate bowl 10, fixedly arranged on a hot runner bracket 110, and a limiting ring groove 11 is arranged on the outer side of the bowl opening;

[0113] A driving cavity 20, arranged on the aggregate bowl 10, comprising a housing 21 and a bottom plate 22. The bottom opening of the housing 21 is closed by the bottom plate 22, and an air expansion groove 25 and a second buckle groove 26 are arranged on the inner side of the housing 21;

[0114] A piston disc 30, accommodated in the housing 21, and having an adjustment hole 33 penetrating through its axis;

[0115] A needle valve adjusting part 40, rotatably installed in the adjustment hole 33 and used for connecting a valve needle 120;

[0116] An elastic inner ring 60, buckled into the second buckle groove 26 to limit the bottom plate 22 from coming out;

[0117] A plurality of axial limiting rods 50, one end of which is embedded and connected to a locking hole 24 on the side wall of the housing 21, and this end also protrudes and locks in the limiting ring groove 11, so that the housing 21 of the driving cavity 20 is rotatable with resistance relative to the aggregate bowl 10;

[0118] A plugging part 70, installed in the adjustment hole 33 to limit the upward movement of the needle valve adjusting part 40;

[0119] A tensioning part 80, penetrating through the plugging part 70 and connected to the needle valve adjusting part 40 to limit the downward movement of the needle valve adjusting part 40;

[0120] Wherein, a first shaft hole 41 of the needle valve adjusting part 40, a second shaft hole 71 of the plugging part 70 and a third shaft hole 81 of the tensioning part 80 are coaxially aligned to form a double locking mechanism.

[0121] The above technical solutions achieve the following remarkable technical effects:

[0122] 1. Regarding the "resistant rotation" design of the drive cavity 20, it has the effects of optimizing the drive flow path layout and operation stability. By the resistant rotation of the housing 21 of the drive cavity 20 relative to the aggregate bowl 10, the spatial orientation of the drive flow path can be adjusted without disassembling the mold, avoiding the fracture risk caused by wiring interference of multiple drive flow paths; one end of the axial limiting rod 50 is embedded and connected to the lock hole 24 of the housing 21, and this end also protrudes and locks in the limiting ring groove 11 of the aggregate bowl 10, allowing the drive cavity 20 to rotate in the XY plane to adjust the drive flow path layout, and preventing accidental displacement during rotation through frictional resistance, ensuring the stable position of the adjusted flow path, and also restricting the Z - direction separation between the drive cavity 20 and the aggregate bowl 10;

[0123] 2. Regarding the double - locking mechanism, it has a mechanism where the blocking member 70 restricts upward movement, the tensioning member 80 restricts downward movement, and the three - axis holes are coaxially aligned; the blocking member 70 is installed in the adjustment hole 33 of the piston disk 30 and directly abuts against the needle valve adjustment member 40, preventing it from moving upward under injection pressure or vibration, avoiding seal failure caused by the displacement of the valve needle 120, and achieving a valve needle position error of less than 0.02 mm (0.1 mm in the traditional solution); the tensioning member 80 (specifically, an anti - lock screw) passes through the blocking member 70 and is connected to the needle valve adjustment member 40, restricting the downward movement of the needle valve adjustment member 40 through screw pre - tightening force, eliminating the risk of sinking caused by gravity or mechanical vibration; the first shaft hole 41 of the needle valve adjustment member 40, the second shaft hole 71 of the blocking member 70, and the third shaft hole 81 of the tensioning member 80 are coaxially aligned, ensuring the uniform distribution of the locking force, avoiding local wear caused by eccentric stress, and improving the anti - vibration performance (the anti - vibration performance is improved by more than 60%);

[0124] 3. In terms of the advantages of modular maintenance, it can be quickly disassembled and assembled; the elastic inner ring 60 is snapped into the second snap groove 26 of the housing 21, combined with the locking of the axial limiting rod 50, forming a modular connection between the drive cavity 20 and the aggregate bowl 10. During maintenance, only the axial limiting rod 50 needs to be released to separate the drive cavity 20 without disassembling the mold, and the maintenance efficiency is increased by 50%;

[0125] 4. Regarding the function of the air - expanding groove 25, it has the effects of improving the sealing degree and durability; the air - expanding groove 25 inside the housing 21 optimizes the drive air flow distribution. Even when the piston disk 30 drops to the bottom dead center and contacts the bottom plate 22, the air pressure below the piston disk 30 can remain due to the setting of the air - expanding groove 25, reducing the vibration interference of the air flow impact on the piston disk 30. At the same time, the pre - tightening force of the elastic inner ring 60 compensates for the thermal expansion in a high - temperature environment, avoiding seal failure of the drive cavity 20. The sealing pressure resistance of the drive cavity 20 of the present invention is increased from 15 MPa to 25 MPa%, and the anti - vibration performance of the needle valve adjustment member 40 is increased from 8 g to 15 g.

[0126] In a variation, a micro pressure sensor (such as a MEMS sensor) is embedded in the piston disk 30 or the drive chamber 20 of the hot runner adjustable needle valve drive device 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 > 100 Hz, the tensioning member 80 is automatically triggered for secondary locking, which can form a "perception - decision - execution" intelligent closed - loop to meet the requirements of Industry 4.0. In addition, a chondroid - like friction layer (such as a PTFE composite material) is provided at the end of the axial limiting rod 50 for pressing against the limiting ring groove 11 of the aggregate bowl 10, which can stabilize the rotational friction coefficient of the drive chamber 20 (0.12 - 0.15). Without external force, the free rotation angle of the drive chamber 20 is less than or equal to 5 degrees, and the maintenance cycle can be extended.

[0127] Refer to Figure 4 , Another embodiment of the present invention further provides an assembly method for a hot runner adjustable needle valve drive device, including steps S1 to S7, and steps S5 to S7 are optional steps; the main steps S1 - S4 are as follows:

[0128] Step S1 can refer to Figure 5 , fixedly install the aggregate bowl 10 on the hot runner bracket 110;

[0129] Step S2 can refer to Figure 6 , assemble the drive chamber 20 and the piston disk 30. The housing 21 of the drive chamber 20 has an opening at the bottom. The piston disk 30 is accommodated in the housing 21. The piston disk 30 has an upper bushing 31 and a lower bushing 32 at the axis and an adjustment hole 33 passing through the upper bushing 31 and the lower bushing 32; the bottom plate 22 of the drive chamber 20 is combined with the bottom opening;

[0130] Step S3 can refer to Figure 7 , place the drive chamber 20 on the aggregate bowl 10, and the housing 21 of the drive chamber 20 is rotatable with resistance relative to the aggregate bowl 10;

[0131] Step S4 can refer to Figure 8 , adjustably install the needle valve adjusting member 40 in the adjustment hole 33 of the piston disk 30, and one end of the valve needle 120 is pre - combined with the needle valve adjusting member 40.

[0132] By adopting the above - mentioned basic method technical solution, an assembly method that can effectively solve the problems of the movable deviation of the adjustable valve needle 120 and the interference of the drive flow path is realized. The specific effects are as follows:

[0133] 1. By fixedly installing the aggregate bowl 10 on the hot runner bracket 110, the basic stability of the entire drive device is ensured, and the problems of additional vibration or displacement caused by unstable installation are avoided;

[0134] 2. By placing the piston disk 30 in the housing 21 of the drive chamber 20 and closing the bottom opening in combination with the bottom plate 22, a sealed and stable internal drive environment is formed, providing guarantee for the precise installation and adjustment of the subsequent needle valve adjuster 40 and optimizing the internal structure layout;

[0135] 3. By arranging the drive chamber 20 on the aggregate bowl 10 and making the housing 21 of the drive chamber 20 rotate with resistance relative to the aggregate bowl 10, the routing of the drive flow path is effectively optimized, reducing the risk of flow path pulling or breaking caused by external operations or environmental factors and enhancing the reliability of the overall hot runner system;

[0136] 4. By adjustably installing the needle valve adjuster 40 in the adjustment hole 33 of the piston disk 30 and making it combine with one end of the valve needle 120, the needle valve driving device is installed first, and then the position of the valve needle 120 is controlled, improving the sealing performance of the injection port 131 and the flow control accuracy during the injection molding process.

[0137] In a specific example, the assembly method further includes step S5. Refer to Figure 9 and Figure 8 , adjust the position of the needle valve adjuster 40 in the adjustment hole 33 of the piston disk 30 in the state where the valve needle 120 closes the injection port 131. When the valve needle 120 closes the injection port 131, the position of the needle valve adjuster 40 in the adjustment hole 33 of the piston disk 30 can be precisely adjusted. This adjustment method ensures the sealing performance of the valve needle 120 in the closed state and provides an accurate reference position for the subsequent installation of the plugging member 70 and the tensioning member 80, effectively avoiding the problem of the valve needle 120 movement deviation caused by inaccurate initial position. Specifically, this step combines the resistance rotation characteristic of the drive chamber 20 to optimize the layout of the drive flow path and reduce the influence of external interference on the adjustment process of the valve needle 120, thereby improving the stability and reliability of the overall needle valve driving device.

[0138] In a specific example, the assembly method further includes step S6. Refer to Figure 10 and Figure 8, after adjusting the needle valve adjusting member 40, the plugging member 70 is installed in the adjusting hole 33 of the piston disk 30, and the plugging member 70 abuts against the needle valve adjusting member 40 to limit the upward movement of the needle valve adjusting member 40 in the adjusting hole 33. The assembling method further includes step S7. After installing the plugging member 70, a tensioning member 80 is installed in the adjusting hole 33 of the piston disk 30. The tensioning member 80 is installed through the plugging member 70 to the needle valve adjusting member 40, and the tensioning member 80 restricts the downward movement of the needle valve adjusting member 40 in the adjusting hole 33. The plugging member 70 is installed in the adjusting hole 33 of the piston disk 30, which can effectively limit the upward displacement of the needle valve adjusting member 40 in the adjusting hole 33 and ensure the position stability of the needle valve adjusting member 40; the tensioning member 80 passes through the plugging member 70 and is connected to the needle valve adjusting member 40, further restricting the downward displacement of the needle valve adjusting member 40 in the adjusting 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 performance caused by the displacement of the needle valve adjusting member 40 during the injection molding process.

[0139] Refer to Figure 11 and Figure 12 , an embodiment of the present invention also discloses a valve needle adjusting tool 200 for performing adjustments in the foregoing steps S5, S6, and S7. The valve needle adjusting tool 200 includes a positioning kit 210 for positioning the driving cavity 20 and the piston disk 30, a plugging positioning sleeve 220 located on the axis of the positioning kit 210 for positioning the plugging member 70, and an adjusting handle 230 located on the axis of the plugging positioning sleeve 220 for adjusting the needle valve adjusting member 40 and the tensioning member 80. The positioning kit 210 includes a positioning disk 211, a plurality of housing positioning rods 212 adjustably arranged at an eccentric position of the positioning disk 211 that is not the center, and a piston positioning cylinder 213 adjustably arranged at the center position of the positioning disk 211. The housing positioning rods 212 are used to position in the first positioning hole 28 of the driving cavity 20 (refer to Figure 9), the piston positioning cylinder 213 passes through the shaft hole of the driving cavity 20 and is positioned in the positioning notch 34 of the piston disk 30. The upper end of the piston positioning cylinder 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 disk 30 and the driving cavity 20 is fixed. The plugging positioning sleeve 220 has a positioning end 221 at the lower part and an inner ring fixed end 222 at the upper part. The plugging positioning sleeve 220 is disposed through the shaft hole of the piston positioning cylinder 213, and the positioning end 221 and the inner ring fixed end 222 are respectively exposed at both ends. The positioning end 221 of the plugging positioning sleeve 220 can be combined with the second tool adjustment section 72 of the plugging member 70 located in the second shaft hole 71. The inner ring fixed end 222 of the plugging positioning sleeve 220 can be fixed by the other end of the fixing handle 240, and the plugging member 70 can be fixed or adjusted. The rod body of the adjustment handle 230 passes through the shaft hole of the plugging positioning sleeve 220, and one end of the rod body of the adjustment handle 230 exposed at the lower end of the plugging positioning sleeve 220 is an adjustment end 231. The adjustment end 231 of the adjustment handle 230 located at the lower part can be combined with both the first tool adjustment section 42 of the needle valve adjustment member 40 located in the first shaft hole 41 and the third tool adjustment section of the tensioning member 80 located in the third shaft hole 81.

[0140] Therefore, this special tool can act on the shaft holes of the needle valve adjustment member 40, the plugging member 70 and the tensioning member 80 at the same time to ensure coaxial alignment, further improving the adjustment accuracy and stability. In addition, the installation step S7 of the tensioning member 80 includes tightening to a preset torque value to provide a constant pre-tightening force to ensure the locking effect. Performing step S5 in the state where the valve needle 120 closes the glue injection port 131 ensures the adjustment accuracy.

[0141] In summary, the embodiment of the present invention optimizes the flow path layout through the resistance rotation design of the driving cavity 20, reducing the risk of flow path interference; establishes a double locking mechanism through the plugging member 70 and the tensioning member 80 such as a reverse lock screw to fix the position of the valve needle 120, preventing the up and down movement of the needle valve adjustment member 40 relative to the piston disk 30, improving the sealing performance and adjustment accuracy; through modular design and positioning design, ensures the precise cooperation between components, improving the 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 driving flow path through innovative structural design and locking mechanism, significantly improving the sealing performance, adjustment stability and maintenance efficiency, and is applicable to the field of high-precision injection molding.

[0142] The embodiments of this specific implementation manner are all preferred embodiments for conveniently understanding or implementing the technical solution of the present invention, and do not limit the protection scope of the present invention accordingly. Any equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. An adjustable needle valve drive device for a hot runner, characterized in that, Comprising: An aggregate bowl, which is fixedly arranged on a hot runner bracket to collect overflowed plastic; A driving cavity, which is arranged on the aggregate bowl. The driving cavity includes a housing with a bottom opening and a bottom plate combined with the bottom opening; A piston disc, which is accommodated in the housing. The piston disc has an upper bushing and a lower bushing located at the axis and an adjustment hole penetrating through the upper bushing and the lower bushing; A needle valve adjusting member, which is adjustably installed in the adjustment hole of the piston disc and is used for combining with one end of a valve needle; Wherein, the aggregate bowl has a bowl mouth for arranging the driving cavity above it, and the aggregate bowl is provided with a limiting annular groove outside the bowl mouth; a first clamping groove for clamping the edge of the bottom plate is opened on the inner side of the housing, and a plurality of locking holes are opened on the side wall of the driving cavity between the first clamping groove and the bottom opening; the hot runner adjustable needle valve driving device further includes: a plurality of axial limiting rods, which are connected in the locking holes, and one end of the axial limiting rod protrudes out of the locking hole and is fixed in the limiting annular groove, so that the housing of the driving cavity rotates with resistance relative to the aggregate bowl to prevent the aggregate bowl from coming off; Wherein, an air expansion groove and a second clamping groove are further opened on the inner side of the housing, the bottom plate is arranged between the air expansion groove and the second clamping groove, and the second clamping groove is located between the first clamping groove and the locking holes. The hot runner adjustable needle valve driving device further includes: an elastic inner ring, which is buckled into the second clamping groove to prevent the bottom plate from coming off, and the bowl mouth of the aggregate bowl abuts against the elastic inner ring; The hot runner adjustable needle valve driving device further includes: A plugging member, which is installed in the adjustment hole of the piston disc to block the upward movement of the needle valve adjusting member in the adjustment hole; A tensioning member, which is located in the adjustment hole of the piston disc. The tensioning member penetrates through the plugging member and is installed on the needle valve adjusting member to limit the downward movement of the needle valve adjusting member in the adjustment hole; The needle valve adjusting member has a first shaft hole, the first shaft hole has a first tool adjustment section and a connection section for combining with the tensioning member; the plugging member has a second shaft hole, the second shaft hole has a second tool adjustment section and a through hole section for the tensioning member to penetrate through; the top surface of the tensioning member is provided with a third shaft hole of a third tool adjustment section; the first shaft hole, the second shaft hole and the third shaft hole are aligned on the axis of the adjustment hole.

2. The hot runner adjustable needle valve driving device according to claim 1, characterized in that, A plurality of driving flow path interfaces are opened on the top surface of the housing; alternatively, a plurality of driving flow path interfaces are opened on the side surface of the housing through the bottom plate.

3. The hot runner adjustable needle valve driving device according to claim 1, characterized in that A first positioning hole is arranged on the upper surface of the housing, and a positioning notch is arranged on the upper bushing.

4. The hot runner adjustable needle valve driving device according to claim 3, wherein, A second positioning hole is arranged on the lower surface of the bottom plate.

5. An adjustable needle valve drive device for a hot runner, characterized in that, Comprising: An aggregate bowl, which is fixedly arranged on a hot runner bracket, and a limiting annular groove is arranged outside its bowl mouth; A driving cavity, which is arranged on the aggregate bowl, includes a housing and a bottom plate. The bottom opening of the housing is closed by the bottom plate, and an air expansion groove and a second clamping groove are opened on the inner side of the housing; A piston disc, which is accommodated in the housing and has an adjustment hole penetrating through its axis; A needle valve adjusting member, which is rotatably installed in the adjustment hole and is used for connecting a valve needle; The elastic inner ring is snapped into the second snap groove to prevent the bottom plate from coming out; A plurality of axial limiting rods, one end of which is embedded and connected to the locking holes on the side wall of the housing, and this end also protrudes and locks into the limiting ring groove, so that the housing of the driving cavity rotates with resistance relative to the aggregate bowl; The plugging member is installed in the adjustment hole to limit the upward movement of the needle valve adjusting member; The tensioning member passes through the plugging member and is connected to the needle valve adjusting member to limit the downward movement of the needle valve adjusting member; Wherein, the first shaft hole of the needle valve adjusting member, the second shaft hole of the plugging member and the third shaft hole of the tensioning member are coaxially aligned to form a double locking mechanism.

6. An assembly method of a hot runner adjustable needle valve driving device, characterized in that, Implemented based on the hot runner adjustable needle valve driving device according to claim 1 or 5, the assembling method includes the following steps: S1. Fix the aggregate bowl on the hot runner bracket; S2. Assemble the driving cavity and the piston disc. The housing of the driving cavity has a bottom opening. The piston disc is accommodated in the housing. The piston disc has an upper shaft sleeve and a lower shaft sleeve at the axis and an adjustment hole passing through the upper shaft sleeve and the lower shaft sleeve; the bottom plate of the driving cavity is combined with the bottom opening; S3. Set the driving cavity on the aggregate bowl, and the housing of the driving cavity rotates with resistance relative to the aggregate bowl; S4. Adjustably install the needle valve adjusting member in the adjustment hole of the piston disc, and one end of the valve needle is pre-combined with the needle valve adjusting member.

7. The assembling method of the hot runner adjustable needle valve driving device according to claim 6, characterized in that It further includes: S5. In the state where the needle valve closes the glue injection port, adjust the position of the needle valve adjusting member in the adjustment hole of the piston disc; S6. After adjusting the needle valve adjusting member, install the plugging member in the adjustment hole of the piston disc. The plugging member abuts against the needle valve adjusting member to limit the upward movement of the needle valve adjusting member in the adjustment hole; S7. After installing the plugging member, install the tensioning member in the adjustment hole of the piston disc. The tensioning member passes through the plugging member and is installed to the needle valve adjusting member. The tensioning member restricts the downward movement of the needle valve adjusting member in the adjustment hole.

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