Single-valve side cylinder oil pressure hot runner system

Abstract

The invention belongs to the technical field of hot runner injection molding, and particularly relates to a single-valve side cylinder oil pressure hot runner system. The bottom of the injection nozzle flange is in threaded connection with a hot nozzle and is provided with a hot nozzle flange sleeve, the top of the injection nozzle flange is provided with a valve needle sleeve through a valve needle sleeve pressing cap, a valve needle is arranged in the valve needle sleeve, and the top of the valve needle is provided with a valve needle hanging table; a runner is communicated among the injection nozzle body, the injection nozzle flange and the hot nozzle; the right connecting seat and the valve needle hanging table are connected with one end of a rocker through a sliding pin I, the middle of the rocker is connected with the middle connecting seat through a sliding pin II, and the other end of the rocker and the left connecting seat are connected with one end of a pull rod through a sliding pin I; the other end of the pull rod is connected with a piston arranged in an oil cylinder body, and the oil cylinder body is installed at the bottom of the base. The air pressure driving assembly can be flexibly replaced according to actual requirements of customers, for example, an oil cylinder body is replaced by an air cylinder body to adapt to an air pressure system.

Description

Technical Field

[0001] This invention belongs to the field of hot runner injection molding technology, and in particular relates to a single-valve side-cylinder hydraulic hot runner system. Background Technology

[0002] Hot runner systems maintain the molten plastic in the runner and gate by heating. Because heating rods and coils are located near or in the center of the runner, the entire runner from the injection molding machine nozzle to the gate is kept at a high temperature, keeping the plastic molten. After shutdown, there's no need to open the runner to remove the solidified material; simply reheat the runner to the required temperature before restarting. Hot runner technology offers advantages such as saving raw materials, reducing costs, shortening molding cycles, improving machine efficiency, enhancing product surface quality and mechanical properties, and improving the aesthetics of injection molded products. However, with the widespread application of hot runner technology, various defects have also emerged to varying degrees in some high-quality plastic parts applications. Different products and mold structures have different requirements. To meet customers' higher product demands and improve market competitiveness, hot runner systems are continuously developing new structures to satisfy customer product needs.

[0003] As people's requirements for plastic products become increasingly demanding, more and more customers want to use hot runner systems to improve quality and save raw materials. Hot runner systems can be divided into single-point and multi-point systems based on the number of injection points. Single-point systems do not have a manifold, thus reducing the number of hot runner plates in the mold. Single-point hot runner systems are further divided into single-point open systems and single-point needle valve systems. Depending on the product structure, materials, and appearance requirements, many products utilize single-point needle valve systems. Current single-point needle valve systems are pneumatically driven, with an external cylinder. The injection nozzle and hot nozzle body are located inside the cylinder. Pneumatic pressure drives the piston to move the valve needle, completing the injection process. However, some customers specify hydraulic systems, in which case the existing commonly used single-point needle valves are insufficient.

[0004] Therefore, the aforementioned problems urgently need to be addressed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a single-valve side-cylinder hydraulic hot runner system.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A single-valve side-cylinder hydraulic hot runner system includes a positioning ring mounted on a panel. The positioning ring is connected to an injection nozzle head, which is threadedly connected to an injection nozzle body. An injection nozzle flange is located at the bottom of the injection nozzle body. A hot nozzle is threadedly connected to the bottom of the injection nozzle flange and fitted with a hot nozzle flange sleeve. A valve needle sleeve is mounted on the top of the injection nozzle flange via a valve needle sleeve cap. A valve needle is installed inside the valve needle sleeve, and a valve needle holder is mounted on the top of the valve needle. The injection nozzle body, injection nozzle flange, and hot nozzle are connected... It has a flow channel; the injection nozzle body has an inverted "L" shaped cross-section and a hollow cavity is provided inside the injection nozzle body. A base is provided inside the hollow cavity. The top of the base is provided with a left connecting seat, a middle connecting seat, and a right connecting seat. The right connecting seat and the valve needle mounting platform are connected to one end of a rocker arm through a sliding pin I. The middle part of the rocker arm is connected to the middle connecting seat through a sliding pin II. The other end of the rocker arm is connected to one end of a pull rod through a sliding pin I. The other end of the pull rod is connected to a piston placed inside the cylinder body. The cylinder body is installed at the bottom of the base.

[0007] Furthermore, the top center of the injection nozzle body is provided with a nozzle mounting groove, the nozzle mounting groove is connected to the injection nozzle transverse flow channel, both sides of the injection nozzle transverse flow channel extend towards the side wall of the injection nozzle body, one end of the injection nozzle transverse flow channel is connected to the injection nozzle vertical flow channel, and the other end of the injection nozzle transverse flow channel is equipped with a plug or threaded plug, and the bottom of the injection nozzle body is provided with a docking groove I that is connected to the injection nozzle vertical flow channel.

[0008] Furthermore, the top center of the injection nozzle flange is provided with a valve needle sleeve mounting groove, and one side of the top of the injection nozzle flange is provided with a docking groove II that mates with docking groove I. The docking groove II is connected to the flange vertical flow channel, and the flange vertical flow channel is connected to one end of the flange horizontal flow channel. A plug or threaded plug is installed at the other end of the flange horizontal flow channel. The bottom center of the injection nozzle flange is provided with a hot nozzle mounting groove.

[0009] Furthermore, the left connecting seat of the base has a left channel, in which a pull rod is slidably connected, and the left channel has symmetrical left sliding grooves; the middle connecting seat of the base has a middle mounting hole; the right connecting seat of the base has a right channel, in which a valve needle holder is slidably connected, and the right channel has symmetrical right sliding grooves, and the bottom of the right channel has a right mounting groove that mates with the valve needle sleeve cap.

[0010] Furthermore, the pull rod includes an upper part and a lower part; the upper part of the pull rod is slidably engaged with the left channel, and the upper part of the pull rod is provided with a pull rod mounting hole, which is slidably engaged with the left sliding groove through a sliding pin I; the lower part of the pull rod is fixedly connected to the piston.

[0011] Furthermore, the valve needle mounting platform includes a valve needle hole and a valve needle mounting hole; the valve needle hole is connected to the valve needle, and the valve needle mounting hole slides with the right sliding groove through a sliding pin I.

[0012] Furthermore, the rocker arm is provided with a left rocker arm hole, a middle rocker arm hole, and a right rocker arm hole in sequence; the left rocker arm hole is connected to the pull rod mounting hole and the sliding pin I; the middle rocker arm hole is connected to the middle mounting hole and the sliding pin II; and the right rocker arm hole is connected to the valve needle mounting hole and the sliding pin I.

[0013] Furthermore, the injection nozzle body and injection nozzle flange are externally mounted on the heater.

[0014] Furthermore, the heater is an open mica heater or an open copper sleeve heater.

[0015] Furthermore, a docking ring is provided between docking groove I and docking groove II. The docking ring has a docking ring flow channel that communicates with the vertical flow channel of the injection nozzle and the vertical flow channel of the flange. The outer peripheral wall of the docking ring is connected to the inner peripheral wall of docking groove I and docking groove II by threads.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This application provides a single-valve side-cylinder hydraulic hot runner system, a single-point needle valve hot runner system suitable for hydraulically driven equipment. The lower left side of the injection nozzle body is designed as a hollow chamber to fit the base. The flow channel is designed on the top and right side of the hollow chamber, and the transverse flow channel of the injection nozzle is designed with a plug. At the same time, the right side of the injection nozzle flange is designed with a flow channel corresponding to the flow channel of the injection nozzle body, and the transverse flow channel of the injection nozzle flange is also designed with a plug.

[0017] 2. The injection nozzle body of this application adopts an inverted "L" shaped cross-section design, combined with a structure of "hollow lower half, side-mounted flow channel, and a plug in the horizontal flow channel." This design avoids the pressure attenuation problem caused by the excessively long melt flow path in traditional straight flow channels, significantly reducing the flow resistance of the plastic melt within the flow channel and minimizing localized overheating or cold material accumulation caused by uneven pressure. Furthermore, the plug design in the horizontal flow channel facilitates subsequent cleaning and maintenance. When residual material or impurities appear in the flow channel, they can be quickly removed by disassembling the plug, eliminating the need to disassemble the entire injection nozzle assembly, significantly shortening equipment maintenance time and improving production continuity. An integrated base is installed within the hollow cavity, integrating the left, middle, and right connecting seats. Simultaneously, a sliding pin precisely connects the rocker arm to the valve needle mount and pull rod, forming a compact lever drive mechanism. This integrated design not only significantly reduces the overall space occupied by the system, but also avoids the drive offset problem caused by the accumulation of gaps between components in traditional distributed connections, ensuring that the rocker arm always maintains a stable motion trajectory during lever transmission, and providing structural support for the precise action of the valve needle.

[0018] 3. Addressing the transmission requirements of the rocker arm and pull rod in the system, this application replaces the conventional circular T-heater with an open mica heater or an open copper sleeve heater. The "open design" cleverly avoids the linkage drive position, preventing spatial interference issues between the traditional heater and transmission components, and ensuring the independent and stable operation of the heating and drive systems. The open heater can precisely fit the structural contours of the injection nozzle body and the hot nozzle, achieving a high degree of matching between the heating area and the flow channel position, reducing heat diffusion to unnecessary areas. Compared to the traditional circular T-heater, heat loss is reduced by 15%-20%, not only lowering the equipment's energy costs but also reducing safety hazards caused by excessively high equipment casing temperatures, thus improving the safety of the workshop production environment.

[0019] 5. Although the system is based on hydraulic drive, the cylinder body adopts a modular design with external fixation to the base. This allows for flexible replacement with pneumatic drive components, such as replacing the hydraulic cylinder body with a pneumatic cylinder body, to adapt to a pneumatic system. This "dual compatibility of hydraulic and pneumatic" design not only meets the needs of mid-to-high-end injection molding scenarios with high requirements for driving force and control precision, but also provides a low-cost adaptation solution for customers with limited budgets and existing pneumatic systems, significantly expanding the system's market application scope. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the injection nozzle body structure of the present invention; Figure 3 This is a schematic diagram of the base structure of the present invention; Figure 4 This is a schematic diagram of the injection nozzle flange structure of the present invention; Figure 5 This is a schematic diagram of the tie rod structure of the present invention; Figure 6 This is a schematic diagram of the valve needle mounting structure of the present invention; Figure 7 This is a schematic diagram of the rocker arm structure of the present invention; Figure 8 This is a top view of the flange sleeve structure of the present invention; Figure 9 This is a schematic diagram of the AA-direction structure of the flange sleeve of the present invention; Figure 10 This is a schematic diagram of the BB-direction structure of the flange sleeve of the present invention; Figure 11 This is a schematic diagram of the docking ring structure of the present invention; Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Therefore, the following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments described in this invention, all other embodiments obtained by those skilled in the art without inventive effort prior to this specification are within the scope of protection of this invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] This application provides a single-valve side-cylinder hydraulic hot runner system, suitable for hydraulically driven equipment, and a single-point needle valve hot runner system. The injection nozzle body focuses on the structural design and rationality of the flow path and machining. Furthermore, the heater cannot use a conventional round copper spring heating zone; the rocker arm drive position requires an opening to avoid this, and instead, an open mica heater or a copper sleeve heater is used. Additionally, the cylinder body is externally fixed to the pull rod, allowing for either a single-piece hydraulic cylinder for hydraulic drive or, according to customer requirements, pneumatic drive. This diversification of product structures allows for greater customer satisfaction. It also meets the specific needs of customers for hot runner systems designed for materials prone to burns at low temperatures, leading our company's hot runner technology to expand into a larger market.

[0027] like Figure 1-11 As shown: A single-valve side-cylinder hydraulic hot runner system includes a positioning ring 1, which is mounted on a panel 17. The positioning ring 1 is connected to an injection nozzle head 2, which is threadedly connected to an injection nozzle body 3. An injection nozzle flange 10 is located at the bottom of the injection nozzle body 3. A hot nozzle is threadedly connected to the bottom of the injection nozzle flange 10 and fitted with a hot nozzle flange sleeve 16. A valve needle sleeve 9 is mounted on the top of the injection nozzle flange 10 via a valve needle sleeve cap 8. A valve needle 18 is installed inside the valve needle sleeve 9, and a valve needle mounting platform 7 is mounted on the top of the valve needle 18. A flow channel connects the injection nozzle body 3, the injection nozzle flange 10, and the hot nozzle. The injection nozzle body 3 has a cross-section... The injection nozzle body 3 has an inverted "L" shape and a hollow chamber 3-5 inside. A base 5 is located inside the hollow chamber 3-5. The top of the base 5 has a left connecting seat 5-1, a middle connecting seat 5-2, and a right connecting seat 5-3. The right connecting seat 5-3 is connected to the valve needle mounting platform 7 by a sliding pin I11 and one end of a rocker arm 6 is connected to the middle connecting seat 5-2 by a sliding pin II12. The other end of the rocker arm 6 is connected to the left connecting seat 5-1 by a sliding pin I11 and one end of a pull rod 13 is connected to the other end of the pull rod 13. The other end of the pull rod 13 is connected to a piston 14 placed inside the cylinder body 15. The cylinder body 15 is installed at the bottom of the base 5.

[0028] The core components of the hot runner system, such as the positioning ring 1, injection nozzle head 2, injection nozzle body 3, valve needle sleeve 9, and cylinder body 15, all adopt threaded connections or detachable installation designs. For example, the injection nozzle head 2 is threadedly connected to the injection nozzle body 3, and the valve needle sleeve 9 is threadedly fixed to the injection nozzle flange 10 via the valve needle sleeve cap 8. This not only simplifies the assembly process and reduces the precision requirements during equipment installation, but also significantly improves the versatility of the components. When a component wears out or fails, the corresponding component can be directly replaced without replacing the entire system, reducing equipment maintenance costs. At the same time, the modular design also facilitates the adjustment of component specifications according to customer needs, such as replacing hot nozzles of different diameters or adapting pistons with different strokes, enhancing the system's customization and adaptability.

[0029] The hot runner system uses a lever transmission structure consisting of a piston, a pull rod, a rocker arm, and a valve needle mounting platform to convert the linear motion of the piston 14 into the precise lifting and lowering motion of the valve needle 18. The application of the lever principle allows for the amplification of the driving force of the valve needle 18 by adjusting the lever arm ratio of the rocker arm 6 under the same hydraulic pressure input, or for reducing the energy consumption of the hydraulic system while meeting the driving force requirements. Simultaneously, the lever transmission has high mechanical efficiency and small transmission clearance, enabling synchronous response between the piston 14's movement and the valve needle 18's action. This avoids the valve needle opening and closing timing deviations caused by transmission lag in traditional direct-drive structures, making it particularly suitable for high-speed molding scenarios with strict injection cycle requirements, thus helping to improve production efficiency per unit time.

[0030] The hydraulic cylinder body 15 adopts a modular design with external fixation to the base 5. It can be flexibly replaced with a pneumatic drive component according to customer needs, such as replacing the hydraulic cylinder body 15 with a pneumatic cylinder body to adapt to a pneumatic system. This "dual-compatibility of hydraulic and pneumatic" design, based on a modular design concept, allows for customization of core parameters such as valve needle diameter, hot nozzle diameter, and flow channel dimensions according to the specifications of the customer's injection molded parts, such as wall thickness and dimensions, and the characteristics of the plastic material, such as flowability and melting point. For example, for thin-walled injection molded parts, a small-diameter hot nozzle and a fine-diameter valve needle can be configured to ensure rapid melt filling; for high-viscosity materials, the flow channel cross-sectional dimensions can be optimized to reduce flow resistance, truly achieving "one system adaptable to multiple product categories," helping customers reduce redundant equipment investment and improve production resource utilization.

[0031] The valve needle sleeve 9, valve needle mounting platform 7, rocker arm 6 and other transmission components are made of high-strength alloy materials and are precision ground to improve surface finish and wear resistance, effectively reducing the wear rate of the components in long-term reciprocating motion.

[0032] Furthermore, the top center of the injection nozzle body 3 is provided with a nozzle mounting groove 3-1, which is connected to the injection nozzle transverse flow channel 3-2. Both sides of the injection nozzle transverse flow channel 3-2 extend towards the side wall of the injection nozzle body 3. One end of the injection nozzle transverse flow channel 3-2 is connected to the injection nozzle vertical flow channel 3-3, and the other end of the injection nozzle transverse flow channel 3-2 is equipped with a plug 19 and a threaded plug 20. The bottom of the injection nozzle body 3 is provided with a docking groove I 3-4 that is connected to the injection nozzle vertical flow channel 3-3.

[0033] The cylindrical nozzle mounting groove 3-1 has an internal thread on its inner wall, which matches the external thread at the bottom of the injection nozzle head 2. During assembly, the injection nozzle head 2 is screwed into the nozzle mounting groove 3-1, and the two are fixedly connected by the thread seal. The top of the injection nozzle head 2 is tightly fitted with the bottom of the positioning ring 1. The positioning ring 1 is fixed to the bottom surface of the panel 17 by bolts, ensuring that the injection nozzle head 2 is accurately connected to the nozzle of the external injection molding machine and avoiding melt leakage.

[0034] The bottom of the nozzle mounting groove 3-1 is connected to a horizontally arranged injection nozzle transverse flow channel 3-2, which extends towards both side walls of the injection nozzle body 3. The inner diameter of the injection nozzle transverse flow channel 3-2 is the same as the inner diameter of the injection nozzle vertical flow channel 3-3, ensuring uniform melt flow resistance. The other end of the injection nozzle transverse flow channel 3-2 penetrates one side wall of the injection nozzle body 3 and employs a double sealing structure of "plug 19 + threaded plug 20" to achieve complete sealing of the injection nozzle transverse flow channel 3-2, preventing melt leakage from the side wall and facilitating disassembly and cleaning of residual melt in the flow channel during later maintenance. The end of the plug 19 is designed with a beveled portion 19-1, which assists in guiding the material in accordance with the direction of melt flow within the flow channel.

[0035] The hollow cavity 3-5 of the injection nozzle body 3 is located in the side area between the nozzle mounting groove 3-1 and the docking groove I 3-4, and is used to accommodate the base 5. The base 5 is fixed to the injection nozzle flange 10 by bolts, and the top of the base 5 is integrally formed with a left connecting seat 5-1, a middle connecting seat 5-2 and a right connecting seat 5-3, which provide support for the installation of the rocker arm 6.

[0036] The design of the plug 19 and threaded plug 20 in the transverse flow channel 3-2 of the injection nozzle facilitates visual inspection of the flow channel, and can promptly detect abnormalities such as impurities and cracks in the flow channel, and identify potential faults in advance.

[0037] Furthermore, the injection nozzle flange 10 has a valve needle sleeve mounting groove 10-5 at the top center, and a docking groove II 10-1 that mates with docking groove I 3-4 on one side of the top of the injection nozzle flange 10. The docking groove II 10-1 is connected to the flange vertical flow channel 10-2, and the flange vertical flow channel 10-2 is connected to one end of the flange transverse flow channel 10-3. The other end of the flange transverse flow channel 10-3 passes through one side wall of the injection nozzle flange 10 and is equipped with a plug 19 and a threaded plug 20. The injection nozzle flange 10 has a hot nozzle mounting groove 10-4 at the bottom center.

[0038] After the valve needle sleeve 9 is embedded into the valve needle sleeve mounting groove 10-5, it is pressed and fixed by the valve needle sleeve pressure cap 8 and fixed by threads. At the same time, a docking groove II 10-1 is opened on the top side of the injection nozzle flange 10, directly below the docking groove I 3-4 of the injection nozzle body 3. The inner diameter of docking groove II 10-1 is consistent with the inner diameter of docking groove I 3-4, and the bottom of docking groove II 10-1 is connected to the top of the flange vertical flow channel 10-2. During assembly, docking groove I 3-4 of the injection nozzle body 3 is aligned with docking groove II 10-1 and the two are connected by threads with a docking ring 21. The docking ring 21 provides a tight sealing connection between docking groove I 3-4 and docking groove II 10-1 to prevent melt leakage. It also facilitates the maintenance and replacement of injection nozzle body 3 and injection nozzle flange 10, thereby achieving a sealed connection between injection nozzle vertical flow channel 3-3 and flange vertical flow channel 10-2.

[0039] The vertical flow channel 10-2 of the flange penetrates vertically through the upper area of ​​the injection nozzle flange 10. Its inner diameter is the same as that of the vertical flow channel 3-3 of the injection nozzle, ensuring that the melt flow orifice diameter is consistent. The bottom of the vertical flow channel 10-2 of the flange is horizontally connected to one end of the transverse flow channel 10-3 of the flange. The inner diameter of the transverse flow channel 10-3 of the flange is the same as that of the vertical flow channel 10-2 of the flange. The other end of the transverse flow channel 10-3 of the flange penetrates one side wall of the injection nozzle flange 10 and adopts the same "plug 19 + threaded plug 20" double sealing structure as the transverse flow channel 3-2 of the injection nozzle, which not only ensures the sealing performance of the flow channel, but also facilitates disassembly and cleaning in the later stage.

[0040] The inner diameter of the hot nozzle mounting groove 10-4 matches the outer diameter of the hot nozzle (shown in the figure but not labeled), and the bottom of the hot nozzle mounting groove 10-4 is connected to the middle of the flange transverse flow channel 10-3. After the hot nozzle is embedded in the hot nozzle mounting groove 10-4, it is fixed by the hot nozzle flange sleeve 16, and its top is connected to the bottom of the injection nozzle flange 10 by bolts to achieve sealing and fixing of the hot nozzle and the injection nozzle flange 10, ensuring that the melt in the flange transverse flow channel 10-3 can flow stably into the hot nozzle and finally be injected into the mold cavity.

[0041] Furthermore, a left channel 5-4 is provided in the left connecting seat 5-1 of the base 5, and a pull rod 13 is slidably connected in the left channel 5-4. A left sliding groove 5-5 is symmetrically provided on the left channel 5-4. A middle mounting hole 5-6 is provided on the middle connecting seat 5-2 of the base 5. A right channel 5-7 is provided in the right connecting seat 5-3 of the base 5, and a valve needle holder 7 is slidably connected in the right channel 5-7. A right sliding groove 5-8 is symmetrically provided on the right channel 5-7. A right mounting groove 5-9 is provided at the bottom of the right channel 5-7 to cooperate with the valve needle sleeve cap 8.

[0042] The left connecting seat 5-1 is a vertically extending block structure. A cylindrical left channel 5-4 is opened vertically inside it. The inner diameter of the left channel 5-4 matches the outer diameter of the upper part of the pull rod 13, which is used to accommodate the pull rod 13 and guide it to slide vertically. At the same time, left sliding grooves 5-5 are symmetrically opened on the front and rear side walls of the left connecting seat 5-1. The left sliding groove 5-5 is a rectangular groove that extends vertically and has semi-circular ends. The width of the left sliding groove 5-5 is slightly larger than the diameter of the sliding pin I11.

[0043] The middle connecting seat 5-2 is a block structure located between the left connecting seat 5-1 and the right connecting seat 5-3. A circular middle mounting hole 5-6 is opened on its top in the horizontal direction. The inner diameter of the middle mounting hole 5-6 matches the outer diameter of the sliding pin II 12 and is used to install the sliding pin II 12, so that the rocker arm 6 can swing flexibly around the sliding pin II 12. The height of the middle connecting seat 5-2 is lower than that of the left connecting seat 5-1 and the right connecting seat 5-3.

[0044] The right connecting seat 5-3 is symmetrically arranged with the left connecting seat 5-1. A cylindrical right channel 5-7 is vertically opened inside the right connecting seat 5-3. The inner diameter of the right channel 5-7 matches the outer diameter of the valve needle holder 7, which is used to guide the vertical sliding of the valve needle holder 7. Right sliding grooves 5-8 are symmetrically opened on the front and rear side walls of the right connecting seat 5-3. The structure of the right sliding groove 5-8 is the same as that of the left sliding groove 5-5. A circular right mounting groove 5-9 is opened at the bottom of the right connecting seat 5-3. The inner diameter of the right mounting groove 5-9 matches the outer diameter of the valve needle sleeve cap 8. When the valve needle sleeve cap 8 is fixed to the top of the injection nozzle flange 10, its top is embedded in the right mounting groove 5-9 to form a positioning fit, which further improves the coaxiality of the right connecting seat 5-3 and the valve needle sleeve 9, and ensures that the valve needle 18 slides smoothly.

[0045] Furthermore, the pull rod 13 includes an upper pull rod 13-1 and a lower pull rod 13-2; the upper pull rod 13-1 is slidably engaged with the left channel 5-4, and the upper pull rod 13-1 is provided with a pull rod mounting hole 13-3, which is slidably engaged with the left sliding groove 5-5 through a sliding pin I11; the lower pull rod 13-2 is fixedly connected to the piston 14.

[0046] The pull rod 13 is a one-piece design, consisting of an upper part 13-1 and a lower part 13-2. The two parts are coaxially arranged and have different diameters. The upper part 13-1 has a larger diameter and slides in conjunction with the left channel 5-4 of the left connecting seat 5-1. The lower part 13-2 has a smaller diameter and is used to connect with the piston 14. At the middle of the upper part 13-1 of the pull rod, a circular pull rod mounting hole 13-3 is opened in the horizontal direction. The inner diameter of the pull rod mounting hole 13-3 matches the outer diameter of the sliding pin I11. During assembly, the sliding pin I11 passes through the left sliding groove 5-5 on one side of the left connecting seat 5-1, the pull rod mounting hole 13-3, and the left sliding groove 5-5 on the other side of the left connecting seat 5-1 in sequence, and is fixed to both ends of the sliding pin I11 by a snap ring to prevent the sliding pin I11 from falling off. At the same time, the pull rod mounting hole 13-3 is aligned with the left rocker hole 6-1 of the rocker arm 6, and the sliding pin I11 passes through the left rocker hole 6-1 to realize the hinge connection between the pull rod 13 and the rocker arm 6, ensuring that the vertical movement of the pull rod 13 can drive the rocker arm 6 to swing around the sliding pin II12 through the sliding pin I11. The bottom of the lower part 13-2 of the pull rod is provided with an external thread, which is screwed into the internal thread hole on the top of the piston 14 and locked with a nut to prevent the pull rod 13 and the piston 14 from loosening during the movement.

[0047] Furthermore, the valve needle mounting platform 7 includes a valve needle hole 7-1 and a valve needle mounting hole 7-2; the valve needle hole 7-1 is connected to the valve needle 18, and the valve needle mounting hole 7-2 slides with the right sliding groove 5-8 through the sliding pin I11.

[0048] The valve needle holder 7 is cylindrical in design, with a circular valve needle hole 7-1 vertically formed at its axis. The inner wall of the valve needle hole 7-1 has an internal thread that engages with the external thread at the top of the valve needle 18, thus fixing the valve needle holder 7 to the valve needle 18. At the center of the valve needle holder 7, a circular valve needle mounting hole 7-2 is formed horizontally. The inner diameter of the valve needle mounting hole 7-2 matches the outer diameter of the sliding pin I11. During assembly, the valve needle holder 7 is inserted into the right... In the right channel 5-7 of the connecting seat 5-3, the sliding pin I11 passes through the right sliding groove 5-8 on one side of the right connecting seat 5-3, the valve needle mounting hole 7-2, the right rocker hole 6-3 of the rocker 6, and the right sliding groove 5-8 on the other side of the right connecting seat 5-3 in sequence, and is fixed at both ends by a snap ring. This achieves the hinge connection between the valve needle mounting platform 7 and the rocker 6, and also restricts the movement trajectory of the valve needle mounting platform 7 through the right sliding groove 5-8, ensuring that it only drives the valve needle 18 to slide vertically.

[0049] Furthermore, the rocker arm 6 is provided with a left rocker arm hole 6-1, a middle rocker arm hole 6-2, and a right rocker arm hole 6-3 in sequence; the left rocker arm hole 6-1 is connected to the pull rod mounting hole 13-3 and the sliding pin I 11, the middle rocker arm hole 6-2 is connected to the middle mounting hole 5-6 and the sliding pin II 12, and the right rocker arm hole 6-3 is connected to the valve needle mounting hole 7-2 and the sliding pin I 11.

[0050] The rocker arm 6 is a long strip design. Along its length, the rocker arm 6 has an elliptical hole, a round hole, an elliptical hole, a left rocker arm hole 6-1 corresponding to one end, a middle rocker arm hole 6-2 located in the middle, and a right rocker arm hole 6-3 located at the other end. Among them, the inner diameter of the left rocker arm hole 6-1 and the right rocker arm hole 6-3 are the same, both matching the outer diameter of the sliding pin I 11, ensuring that the rocker arm 6 can rotate flexibly around the sliding pin I 11. The inner diameter of the middle rocker arm hole 6-2 matches the outer diameter of the sliding pin II 12. During assembly, the sliding pin II 12 passes through the middle rocker arm hole 6-2 and is embedded in the middle mounting hole 5-6 of the middle connecting seat 5-2. The two ends of the sliding pin II 12 are fixed by a retaining spring, so that the rocker arm 6 forms a lever structure with the sliding pin II 12 as the fulcrum.

[0051] Furthermore, the injection nozzle body 3 and the injection nozzle flange 10 are externally mounted on the heater 4.

[0052] Furthermore, heater 4 is an open mica heater or an open copper sleeve heater.

[0053] Mica heaters are characterized by good insulation and high thermal conductivity, while copper sleeve heaters have the advantages of high temperature resistance and long service life. Both types of heaters can achieve uniform heating of the injection nozzle body and hot nozzle, effectively controlling the temperature fluctuation range of the melt in the flow channel. The temperature deviation can be controlled within ±2℃, avoiding melt solidification caused by local low temperature or material degradation caused by local high temperature, thus ensuring the physical properties and appearance quality of the injection molded parts.

[0054] Furthermore, a docking ring 21 is provided between docking groove I3-4 and docking groove II10-1. The docking ring 21 has a docking ring flow channel 21-1 that communicates with the vertical flow channel 3-3 of the injection nozzle and the vertical flow channel 10-2 of the flange. The outer peripheral wall of the docking ring 21 is connected to the inner peripheral wall of docking groove I3-4 and docking groove II10-1 by threads.

[0055] The inner diameter of the circular docking groove I3-4 is consistent with the inner diameter of the docking groove II10-1 on the top of the injection nozzle flange 10. The outer diameter of the docking ring 21 between the docking grooves I3-4 and II10-1 is consistent with the inner diameters of the circular docking grooves I3-4 and II10-1. The inner diameter of the docking ring 21 is consistent with the inner diameter of the vertical flow channel 3-3 of the injection nozzle and the inner diameter of the vertical flow channel 10-2 of the flange. This design completely solves the problems of fluid turbulence, pressure loss, and material residue caused by inconsistent flow channel diameters and docking gaps in traditional connection structures. It ensures that the melt (or other transfer medium) flows smoothly along the flow channel during injection, without local stagnation or sudden changes in flow rate. This not only ensures precise control of the injection volume but also reduces the risks of material aging and contamination caused by medium stagnation. It is especially suitable for high-precision injection molding scenarios with stringent requirements for media transfer stability.

[0056] The mating ring 21 is fixed by a threaded connection between its outer peripheral wall and the inner peripheral walls of mating grooves I3-4 and II10-1. Simultaneously, the dual dimensional fit of the outer and inner diameters creates a synergistic structural sealing effect. The threaded connection not only provides axial preload, ensuring a tight fit between the mating ring 21 and the two mating grooves and preventing loosening due to vibration or pressure fluctuations, but also forms a labyrinth seal structure through the dual contact between the threaded surface and the end face of the mating ring, effectively blocking the path of media leakage from the connection gap. Compared to traditional single sealing methods (such as gasket seals or interference fit seals), this structure significantly improves sealing reliability, can withstand the pressure impact of media under high-pressure injection conditions, and avoids sealing failures caused by gasket aging or interference fit deformation, thus extending the stable operating cycle of the equipment.

[0057] The threaded connection design of the docking ring 21 replaces the traditional welding, one-piece molding, or complex snap-fit ​​connection structure, realizing the modular disassembly and assembly of the injection nozzle body 3 and the injection nozzle flange 10. During assembly, simply screw the docking ring 21 into any docking groove and then complete the alignment and fastening of the two parts. No special tooling equipment is required, which greatly simplifies the assembly process and improves assembly efficiency. When maintaining or replacing parts, the injection nozzle body 3 and the injection nozzle flange 10 can be quickly separated by disassembling the docking ring 21, which facilitates the cleaning and maintenance of the internal flow channel, or the replacement of the worn docking ring 21, without the need to disassemble the entire equipment body, reducing maintenance difficulty and downtime losses. In addition, the standardized size matching design (uniform inner diameter of the docking groove and the inner diameter of the flow channel) makes the docking ring 21 have good versatility and can be adapted to injection nozzle body 3 and injection nozzle flange 10 parts of the same specification series, improving the convenience of spare parts management.

[0058] The inner diameters of mating groove I3-4 and mating groove II10-1 are identical, and the outer diameter of mating ring 21 precisely matches the inner diameter of the mating groove, forming a circumferentially uniform contact surface. When high pressure is generated in the flow channel during injection, the radial pressure of the medium on the inner wall of mating ring 21 can be transmitted to the two mating grooves through the uniform outer circumferential contact surface, avoiding deformation of mating groove 21 or damage to mating ring 21 caused by localized stress concentration. At the same time, the circumferential fastening force of the threaded connection further ensures the rigid connection between mating ring 21 and the two components, reduces vibration transmission during equipment operation, improves the structural stability of the injection nozzle and flange connection, and thus ensures the accuracy and safety of the entire injection system operation, especially suitable for equipment operation requirements under long-term, high-frequency, and high-pressure conditions.

[0059] The independent structural design of the docking ring 21 makes the structural design of the injection nozzle body 3 and the injection nozzle flange 10 more flexible. By replacing the docking ring 21 with different materials (such as high-temperature resistant and corrosion-resistant materials), it can adapt to the injection requirements of different media types (such as high-temperature melts and corrosive fluids) without modifying the structure of the injection nozzle body 3 and the injection nozzle flange 10, thus reducing the product customization cost. At the same time, the internal flow channel of the docking ring 21 can be optimized according to needs (such as adding flow guiding structures, heat preservation channels, etc.), achieving functional upgrades without changing the structure of the main components. This provides a convenient optimization path for the performance iteration of subsequent products and improves the scalability of the entire injection system.

[0060] On the circumferential surface of the hot nozzle flange sleeve 16, screw holes 16-1 and pin holes 16-2 are evenly distributed. The positions of the screw holes 16-1 correspond one-to-one with the pre-set threaded holes at the bottom of the injection nozzle flange 10, and are used to fix the hot nozzle flange sleeve 16 and the injection nozzle flange 10 together with hexagonal head screws. The pin holes 16-2 are symmetrically distributed at 180° and located on the vertical line between two adjacent screw holes 16-1. They are used to insert cylindrical pins to achieve precise positioning of the hot nozzle flange sleeve 16 and the injection nozzle flange 10, and to prevent circumferential rotation of the flange sleeve during installation or operation.

[0061] After processing, during installation, the first step is to install the injection nozzle head 2 onto the injection nozzle body 3, tightening it with the external thread of the injection nozzle head 2 and the internal thread of the injection nozzle body 3. Then, plug the injection nozzle transverse flow channel 3-2 on the injection nozzle body 3 with a plug 19 and a threaded plug 20, and install four upper gaskets. The second step is to connect the hot nozzle and nozzle tip to the hot nozzle mounting groove 10-4 via threaded connection, then fix it with screw holes 16-1 and position it with pin holes 16-2, and install the hot nozzle flange sleeve 16. The axial positioning surface on the injection nozzle flange 10 has a groove to reduce surface contact and heat dissipation. The valve needle sleeve cap 8 and valve needle sleeve 9 are installed in a conventional manner. The third step is to install the base 5 after the valve needle 18 and valve needle mount 7 are fitted together, fixing it with Φ8 sliding pin 11, Φ10 sliding pin 12, and rocker arm 6. The axial mating surface of the valve needle mount 7 mates with the internal axial mating surface of the base 5. Fourth, install the pull rod 13 onto the piston 14 inside the cylinder body 15. The cylinder body 15 is then fixed to the base 5 with screws. The pull rod 13 is fixed to the base via the pull rod mounting hole 13-3, the rocker arm 6, and the Φ8 sliding pin 11. During the installation of the base 5, the injection nozzle body and the body flange have a flow channel connection, and the connection point is sealed with a sealing ring to prevent glue leakage. The installation process involves conventional methods such as using gaskets, pins, screws, and heaters.

[0062] The melt from the external injection molding machine is guided into the injection nozzle head 2 through the positioning ring 1, and then enters the nozzle head mounting groove 3-1 of the injection nozzle body 3. It then flows into the transverse flow channel 3-2 of the injection nozzle. Because the other end of the transverse flow channel 3-2 of the injection nozzle is sealed by the plug 19 and the threaded plug 20, the melt turns and flows into the vertical flow channel 3-3 of the injection nozzle. It then enters the flange vertical flow channel 10-2 through the sealed docking area of ​​the docking groove I 3-4 and the docking groove II 10-1, and then turns and flows into the flange transverse flow channel 10-3. Finally, it enters the hot nozzle through the hot nozzle mounting groove 10-4, waiting to be injected into the mold cavity. During injection molding, the oil circuit enters the cylinder body 15 of the oil cylinder through the oil pipe joint. After oil enters, the piston 14 moves upward, driving the pull rod 13 to move upward. The cylinder body 15 moves upward, and the valve needle mounting platform 7 at the other end moves downward, with the valve needle 18 extending out of the parting surface to seal the mold. When oil exits, the piston 14 moves downward, the pull rod 13 moves downward, the cylinder body 15 moves downward, and the valve needle mounting platform 7 at the other end moves upward with the valve needle 18. The valve needle 18 retracts, and the plastic enters the mold cavity, completing the injection molding process.

[0063] When the piston 14 inside the cylinder body 15 moves upward, it drives the pull rod 13 to slide upward along the left channel 5-4 of the left connecting seat 5-1. At this time, the pull rod mounting hole 13-3 of the upper part 13-1 of the pull rod drives the sliding pin I11 to move upward along the left sliding groove 5-5. The sliding pin I11 pushes the left end of the rocker arm 6 to swing upward at the left hole 6-1. Since the rocker arm 6 uses the sliding pin II12 passing through the middle hole 6-2 and the middle mounting hole 5-6 of the rocker arm as the fulcrum, according to the lever principle, the right end of the rocker arm 6 swings downward at the right hole 6-3. Through the sliding pin I11, it drives the valve needle mounting platform 7 to slide downward along the right channel 5-7 of the right connecting seat 5-3, thereby driving the valve needle 18 to move downward in the valve needle sleeve 9 and opening the hot nozzle outlet.

[0064] When piston 14 moves downward, pull rod 13 slides downward along left channel 5-4, sliding pin I 11 moves downward along left sliding groove 5-5, pulling the left end of rocker arm 6 downward and the right end of rocker arm 6 upward, causing valve needle holder 7 to slide upward along right channel 5-7, and valve needle 18 moves upward synchronously, closing the hot nozzle outlet. Throughout the movement, left sliding groove 5-5 and right sliding groove 5-8 respectively restrict the circumferential rotation of pull rod 13 and valve needle holder 7, ensuring accurate transmission direction and avoiding sealing failure or jamming problems caused by valve needle 18 misalignment.

[0065] The left channel 5-4 and the right channel 5-7 respectively guide the sliding of the pull rod 13 and the valve needle mounting platform 7. With the circumferential limiting of the left sliding groove 5-5 and the right sliding groove 5-8, the transmission trajectory of the pull rod 13, the rocker arm 6 and the valve needle mounting platform 7 is highly controllable, and the opening and closing accuracy of the valve needle 18 is higher, effectively avoiding melt leakage or injection defects caused by transmission offset.

[0066] When it is necessary to clean the residual melt in the flow channel, the plug 20 on the side wall of the injection nozzle body 3 and the injection nozzle flange 10 can be removed first, and the plug 19 can be taken out. A special cleaning rod can be used to unclog the transverse flow channel 3-2 of the injection nozzle and the transverse flow channel 10-3 of the flange. If the valve needle 18 needs to be replaced, the valve needle sleeve cap 8 can be removed, and the valve needle sleeve 9 can be taken out before the valve needle 18 can be replaced. There is no need to disassemble the entire system, which significantly improves maintenance efficiency.

[0067] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or variations to the present invention without departing from the technical concept of the present invention, and such modifications or variations naturally fall within the protection scope of the present invention.

Claims

1. A single valve side cylinder oil pressure hot runner system, comprising a positioning ring (1) mounted on a panel (17), the positioning ring (1) being connected with an injection nozzle head (2), characterized in that: the injection nozzle head (2) is threadedly connected with an injection nozzle body (3), the bottom of the injection nozzle body (3) is provided with an injection nozzle flange (10), the bottom of the injection nozzle flange (10) is threadedly connected with a hot nozzle and is mounted with a hot nozzle flange sleeve (16), the top of the injection nozzle flange (10) is mounted with a valve needle sleeve (9) through a valve needle sleeve pressing cap (8), the valve needle sleeve (9) is mounted with a valve needle (18) inside, and the top of the valve needle (18) is mounted with a valve needle hanging table (7); the injection nozzle body (3), the injection nozzle flange (10) and the hot nozzle are communicated with a flow channel; the cross section of the injection nozzle body (3) is in an inverted "L" shape, and the injection nozzle body (3) is provided with a hollow chamber (3-5) inside, the hollow chamber (3-5) is provided with a base (5) inside, the top of the base (5) is provided with a left connecting seat (5-1), a middle connecting seat (5-2) and a right connecting seat (5-3), the right connecting seat (5-3) is connected with one end of a rocker (6) through a sliding pin I (11), the middle of the rocker (6) is connected with the middle connecting seat (5-2) through a sliding pin II (12), the other end of the rocker (6) is connected with one end of a pull rod (13) through a sliding pin I (11), the other end of the pull rod (13) is connected with a piston (14) placed in an oil cylinder body (15), and the oil cylinder body (15) is mounted at the bottom of the base (5).

2. The single valve side cylinder oil pressure hot runner system according to claim 1, characterized in that: the top center of the injection nozzle body (3) is provided with a head mounting groove (3-1), the head mounting groove (3-1) is communicated with an injection nozzle transverse flow channel (3-2), both sides of the injection nozzle transverse flow channel (3-2) extend to the side wall of the injection nozzle body (3), one end of the injection nozzle transverse flow channel (3-2) is communicated with an injection nozzle vertical flow channel (3-3), the other end of the injection nozzle transverse flow channel (3-2) is mounted with a plug (19) and a threaded plug (20), and the bottom of the injection nozzle body (3) is provided with an abutting groove I (3-4) communicated with the injection nozzle vertical flow channel (3-3).

3. The single valve side cylinder oil pressure hot runner system according to claim 2, characterized in that: the top center of the injection nozzle flange (10) is provided with a valve needle sleeve mounting groove (10-5), one side of the top of the injection nozzle flange (10) is provided with an abutting groove II (10-1) matched with the abutting groove I (3-4), the abutting groove II (10-1) is communicated with a flange vertical flow channel (10-2), the flange vertical flow channel (10-2) is communicated with one end of a flange transverse flow channel (10-3), the other end of the flange transverse flow channel (10-3) is mounted with a plug (19) and a threaded plug (20), and the bottom center of the injection nozzle flange (10) is provided with a hot nozzle mounting groove (10-4). ​ ​ ​ ​ ​ 4. The single valve side cylinder oil pressure hot runner system according to claim 3, characterized in that: A left channel (5-4) is formed in the left connecting seat (5-1) of the base (5), and a pull rod (13) is slidably connected in the left channel (5-4); left sliding grooves (5-5) are symmetrically formed on the left channel (5-4); A middle mounting hole (5-6) is arranged on the middle connecting seat (5-2) of the base (5); A right channel (5-7) is formed in the right connecting seat (5-3) of the base (5), and a valve needle hanging table (7) is slidably connected in the right channel (5-7); right sliding grooves (5-8) are symmetrically formed on the right channel (5-7), and a right mounting groove (5-9) is arranged at the bottom of the right channel (5-7) and matched with a valve needle sleeve pressure cap (8).

5. The single valve side cylinder oil pressure hot runner system according to claim 4, characterized in that: The pull rod (13) comprises a pull rod upper part (13-1) and a pull rod lower part (13-2); The pull rod upper part (13-1) is slidably matched with the left channel (5-4), and a pull rod mounting hole (13-3) is arranged on the pull rod upper part (13-1); the pull rod mounting hole (13-3) is slidably matched with the left sliding grooves (5-5) through a sliding pin I (11); The pull rod lower part (13-2) is fixedly connected with the piston (14).

6. The single valve side cylinder oil pressure hot runner system according to claim 5, characterized in that: The valve needle hanging table (7) comprises a valve needle hole (7-1) and a valve needle mounting hole (7-2); The valve needle hole (7-1) is matched with the valve needle (18), and the valve needle mounting hole (7-2) is slidably matched with the right sliding grooves (5-8) through a sliding pin I (11).

7. The single valve side cylinder oil pressure hot runner system according to claim 6, characterized in that: A rocker left hole (6-1), a rocker middle hole (6-2) and a rocker right hole (6-3) are sequentially arranged on the rocker (6); The rocker left hole (6-1) is matched with the pull rod mounting hole (13-3) and the sliding pin I (11), the rocker middle hole (6-2) is matched with the middle mounting hole (5-6) and the sliding pin II (12), and the rocker right hole (6-3) is matched with the valve needle mounting hole (7-2) and the sliding pin I (11).

8. The single valve side cylinder oil pressure hot runner system according to claim 1, characterized in that: The injection nozzle body (3) and the injection nozzle flange (10) are arranged outside the heater (4).

9. The single valve side cylinder oil pressure hot runner system according to claim 8, characterized in that: The heater (4) is an open mica heater or an open copper sleeve heater.

10. The single valve side cylinder oil pressure hot runner system according to claim 3, characterized in that: The butt joint groove I (3-4) and the butt joint groove II (10-1) are provided with a butt joint ring (21), the butt joint ring (21) is internally provided with a butt joint ring flow channel (21-1) communicated with the injection nozzle vertical flow channel (3-3) and the flange vertical flow channel (10-2), and the outer circumferential wall of the butt joint ring (21) is connected with the inner circumferential walls of the butt joint groove I (3-4) and the butt joint groove II (10-1) through threads.

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