Hydraulic pusher type cylindrical manifold synchronous injection molding system

Abstract

This utility model relates to the field of hot runner technology, and in particular to a hydraulic push-plate type cylindrical manifold synchronous injection molding system. It includes a synchronous injection module for achieving multi-cavity synchronous injection molding. The synchronous injection module includes: a main component, including a template mounted on the injection unit of an injection molding machine; side plates fixed at both ends of the top of the template; a cylindrical manifold module mounted between the two side plates; a locking heating coil fitted on the outer surface of the cylindrical manifold module; a feed nozzle assembly fixed at the front end of the cylindrical manifold module; a discharge nozzle assembly fixed at the upper end of the cylindrical manifold module; and a flow channel inside the cylindrical manifold module connecting the feed nozzle assembly and the discharge nozzle assembly. By using an integrated cylindrical manifold with 360° heating to ensure uniform temperature, symmetrical hydraulic cylinder drive and linear guide rail to achieve high-precision synchronous control of the valve needle, combined with a short injection path and pressure compensation design, the injection accuracy and stability of heat-sensitive materials are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, specifically to a hydraulic pusher type cylindrical manifold synchronous injection molding system. Background Technology

[0002] With the development of precision injection molding technology, multi-cavity synchronous injection molding systems are playing an increasingly important role in the production of precision plastic products such as optical components and electronic connectors. Traditional injection molding systems typically employ a rectangular manifold structure, controlling melt flow through hydraulic or mechanical drives. In recent years, with the continuous improvement of precision requirements for injection molded products, especially for the processing of heat-sensitive materials such as PMMA and PC, the industry has placed higher demands on the temperature control accuracy, synchronization, and stability of injection molding systems.

[0003] According to CN208773986U, a push-plate type valve needle actuation structure hot runner system is disclosed. This technology discloses "a push-plate type valve needle actuation structure hot runner system, including a manifold plate, the manifold plate is connected to a hot nozzle structure, the hot nozzle structure is provided with a valve needle, the top of the manifold plate is provided with a push plate, the two ends of the push plate are provided with cylinders, the push plate is provided with a valve needle driving component to drive the valve needle to move, and the push plate is driven by the cylinder to realize the movement of the valve needle by the push plate", which has the technical effect of "using the cylinder to drive the push plate, and the push plate connects all the valve needles to realize the movement, which can effectively solve the problem of dense points where it is impossible to install a single cylinder".

[0004] Traditional rectangular manifold structures, due to their inherent geometric asymmetry, generate significant temperature gradients during heating, leading to uneven temperature distribution across different areas of the manifold. This results in lower temperatures at the four corners due to longer heat conduction paths, while the central area tends to accumulate excessive heat. Temperature differences also exist between the various flow channel branches based on their distance from the heat source. Furthermore, the difference in heat dissipation characteristics between the corner and planar parts of the rectangular structure further exacerbates temperature fluctuations. This inconsistency in temperature distribution causes the melt to undergo an uneven thermal process within the flow channel system. In some areas, the melt may degrade due to overheating, while in other areas, insufficient temperature may increase flow resistance, severely impacting the stability of the injection molding process and the uniformity of product quality. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic pusher-type cylindrical manifold synchronous injection molding system. By using an integrated cylindrical manifold with 360° heating to ensure uniform temperature, symmetrical hydraulic cylinder drive and linear guide rail to achieve high-precision synchronous control of valve needles, combined with short injection path and pressure compensation design, the injection accuracy and stability of heat-sensitive materials are significantly improved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic pusher-type cylindrical manifold synchronous injection molding system, including a synchronous injection module for realizing multi-cavity synchronous injection molding, the synchronous injection module comprising:

[0007] The main components include a template installed on the injection unit of an injection molding machine. Side plates are fixed at both ends of the top of the template. A cylindrical manifold module is installed between the two side plates. A locking heating coil is fitted on the outer surface of the cylindrical manifold module. A feed nozzle assembly is fixed at the front end of the cylindrical manifold module. A discharge nozzle assembly is fixed at the top end of the cylindrical manifold module. A flow channel is opened inside the cylindrical manifold module and connects the feed nozzle assembly and the discharge nozzle assembly.

[0008] The power unit is mounted on the main unit and is used to provide linear driving force.

[0009] Preferably, the power assembly includes hydraulic cylinders symmetrically arranged on both sides inside the template, a push plate is rigidly connected between the output ends of the two hydraulic cylinders, and a valve needle that can move axially is provided inside the discharge nozzle assembly, and the push plate drives the valve needle to make synchronous linear motion.

[0010] Preferably, the power assembly further includes a pressure compensation valve disposed at the rear end of the template, and the pressure compensation valve is connected to the hydraulic circuit of the oil cylinder.

[0011] Preferably, the power assembly further includes a disc spring assembly disposed inside the push plate, and the disc spring assembly is located at the bottom of the valve needle and in contact with it.

[0012] Preferably, the power assembly further includes linear guide rails fixed on both sides of the top of the template, and the push plate is slidably connected to the linear guide rails.

[0013] Preferably, the main component further includes a connector fixed in the middle of the top of the template, and the upper end of the connector is fixed to the bottom of the cylindrical diverter module.

[0014] Beneficial effects

[0015] This invention provides a hydraulic pusher-type cylindrical manifold synchronous injection molding system. Compared with the prior art, it has the following advantages:

[0016] 1. The cylindrical manifold module adopts an integrated structure formed by integral processing of high-strength alloy steel. Combined with the 360° uniform heating design of the snap-on heating coil, it ensures a high degree of uniformity in temperature distribution of the melt in all parts of the flow channel. The symmetrical characteristics of the cylindrical structure effectively avoid the temperature gradient problem of traditional rectangular manifolds. The overall processing technology eliminates the heat loss and melt retention risk caused by splicing seams. The installation method of direct mating with the template eliminates the traditional transition plate structure, which not only simplifies the assembly process, but also significantly reduces heat conduction loss, so that the system can maintain stable thermal performance and dimensional accuracy under long-term high-temperature working conditions.

[0017] 2. Through the synergistic effect of symmetrically arranged hydraulic cylinders and precision linear guides, high-precision synchronous control of multiple valve needles is achieved; the push plate is made of lightweight titanium alloy material, combined with a gapless linear guide system, which greatly reduces the inertia and friction loss of moving parts; the introduction of a pressure compensation valve enables the system to automatically adjust the output pressure of the hydraulic cylinders, effectively compensating for the effects of load fluctuations and temperature changes; ensuring the high synchronicity and repeatability of valve needle opening and closing actions, providing a reliable guarantee for the consistency of multi-cavity injection molded products. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the front end of this utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of the rear end of this utility model;

[0020] Figure 3 This is a top sectional view of the present invention;

[0021] Figure 4 This is a front sectional view of the present invention.

[0022] In the diagram: 1. Synchronous injection molding module; 11. Main body component; 111. Template; 112. Side plate; 113. Cylindrical manifold module; 114. Locking heating coil; 115. Feed nozzle assembly; 116. Discharge nozzle assembly; 117. Flow channel; 118. Connector; 12. Power component; 121. Hydraulic cylinder; 122. Push plate; 123. Valve needle; 124. Pressure compensation valve; 125. Disc spring assembly; 126. Linear guide rail. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a hydraulic pusher type cylindrical manifold synchronous injection molding system, including a synchronous injection module 1 for realizing multi-cavity synchronous injection molding, the synchronous injection module 1 including:

[0025] The main component 11 includes a template 111 installed on the injection unit of the injection molding machine. Side plates 112 are fixed at both ends of the top of the template 111. A cylindrical flow divider module 113 is installed between the two side plates 112. A locking heating coil 114 is fitted on the outer surface of the cylindrical flow divider module 113. A feed nozzle assembly 115 is fixed at the front end of the cylindrical flow divider module 113. A discharge nozzle assembly 116 is fixed at the upper end of the cylindrical flow divider module 113. A flow channel 117 is opened inside the cylindrical flow divider module 113 and connects the feed nozzle assembly 115 and the discharge nozzle assembly 116.

[0026] The power unit 12 is mounted on the main body unit 11 and is used to provide linear driving force.

[0027] In this embodiment, the cylindrical flow divider module 113 adopts an integrated cylindrical structure formed by integral processing of high-strength alloy steel, which has excellent thermal stability and mechanical strength. Its cylindrical outer surface is precisely matched with the inner surface of the locking heating coil 114 to achieve 360° all-round uniform heating, ensuring that the temperature distribution of the melt in all parts of the flow channel 117 is uniform. The locking heating coil 114 adopts a quick disassembly and assembly structure for easy maintenance.

[0028] Specifically, the power assembly 12 includes hydraulic cylinders 121 symmetrically arranged on both sides inside the template 111. A push plate 122 is rigidly connected between the output ends of the hydraulic cylinders 121 on both sides. A valve needle 123 that can move axially is provided inside the discharge nozzle assembly 116. The push plate 122 drives the valve needle 123 to make synchronous linear motion.

[0029] In this embodiment, the valve needle 123 is directly mounted by optimizing the short injection path, which significantly shortens the axial distance between the valve needle 123 and the manifold channel 117. This structure effectively reduces the residence time of the melt in the channel and reduces the shear heat generated by the melt at the nozzle. It is particularly suitable for precision injection molding of heat-sensitive materials such as PMMA, PC, PET, and PETG. The hydraulic cylinders 121 arranged symmetrically on both sides ensure the synchronous linear movement of multiple valve needles 123 through the rigidly connected push plate 122, eliminating the off-center load phenomenon that may be generated by traditional single-sided drive, and making the melt flow of each nozzle assembly 116 more balanced and consistent.

[0030] Specifically, the power assembly 12 also includes a pressure compensation valve 124 located at the rear end of the template 111, and the pressure compensation valve 124 is connected to the hydraulic circuit of the oil cylinder 121.

[0031] In this embodiment, the valve body adopts an integral casting structure and has a built-in precision pressure regulating mechanism. The pressure compensation valve 124 can monitor the pressure change of the working chamber of the oil cylinder 121 in real time and compensate for the pressure deviation caused by load fluctuation or temperature change by automatically adjusting the valve core opening. This ensures that the push plate 122 obtains a continuous and stable driving force during the movement, eliminates the pressure pulsation phenomenon commonly found in traditional hydraulic systems, and makes the opening and closing action of the valve needle 123 more stable and precise.

[0032] Specifically, the power assembly 12 also includes a disc spring assembly 125 disposed inside the push plate 122, and the disc spring assembly 125 is located at the bottom of the valve needle 123 and in contact with it.

[0033] In this embodiment, the disc spring assembly 125 is composed of multiple high-temperature alloy steel disc springs stacked together. It is installed in the spring seat inside the push plate 122 by pre-compression. Its top maintains a constant contact pressure with the tail end of the valve needle 123. This elastic buffer structure can provide a stable pre-tightening force to ensure the sealing effect when the valve needle 123 is closed. At the same time, it absorbs the impact vibration during the hydraulic system drive and compensates for the dimensional changes caused by thermal expansion during the operation. When the push plate 122 returns, the elastic restoring force of the disc spring assembly 125 assists the valve needle 123 to quickly reset.

[0034] Specifically, the power assembly 12 also includes linear guide rails 126 fixed on both sides of the top of the template 111, and the push plate 122 is slidably connected to the linear guide rails 126.

[0035] In this embodiment, the push plate 122 is made of lightweight titanium alloy and forms a gapless fit with the linear guide rail 126 through a precision-machined slider. This allows the push plate 122 to maintain a stable linear motion trajectory during movement, effectively eliminating the gap and wobble problems existing in traditional guide structures. The lightweight push plate 122 made of titanium alloy reduces the inertia of moving parts. Combined with the guiding effect of the high-precision linear guide rail 126, it ensures the synchronicity and repeatability of the opening and closing action of the valve needle 123, while improving the system's response speed and service life.

[0036] Specifically, the main component 11 also includes a connector 118 fixed in the middle of the top of the template 111, and the upper end of the connector 118 is fixed to the bottom of the cylindrical diverter module 113.

[0037] In this embodiment, the outer surface of the cylindrical manifold module 113 is directly fitted with the pre-machined positioning structure of the template 111. Direct centering and positioning are achieved through precision-machined positioning grooves and positioning holes, eliminating the use of transition plates in traditional structures. This direct positioning and installation method reduces intermediate connection links, effectively reducing heat conduction loss. At the same time, by eliminating the assembly accumulation error caused by the transition plate, the installation and positioning accuracy of the cylindrical manifold module 113 is significantly improved, ensuring the precise centering of the melt flow channel 117 and the mold gating system.

[0038] The working principle and usage process of this utility model are as follows: First, the main component 11 is installed on the injection unit of the injection molding machine through the template 111. The cylindrical diverter module 113 is integrally formed by high-strength alloy steel. 360° uniform heating is achieved through the locking heating coil 114. The power component 12 drives the push plate 122 through the symmetrically arranged oil cylinder 121, which drives the valve needle 123 to achieve synchronous linear motion.

[0039] The melt enters the flow channel 117 of the cylindrical manifold module 113 from the feed nozzle assembly 115, and flows to each discharge nozzle assembly 116 under the uniform heating condition of the locking heating coil 114. The hydraulic cylinder 121, through the precise control of the pressure compensation valve 124, pushes the push plate 122 to move smoothly along the linear guide rail 126, driving the valve needle 123 to complete the opening and closing action. Multiple valve needles 123 achieve synchronous movement with the assistance of the disc spring assembly 125 to ensure that the melt filling of each cavity is consistent. When the hydraulic cylinder 121 returns, the disc spring assembly 125 provides auxiliary reset force to make the valve needle 123 quickly reset.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil pressure push plate type cylindrical distribution plate synchronous injection molding system, characterized in that: Includes a synchronous injection molding module (1) for realizing multi-cavity synchronous injection molding, the synchronous injection molding module (1) includes: The main component (11) includes a template (111) installed on the injection unit of the injection molding machine. Both ends of the top of the template (111) are fixed with side plates (112). A cylindrical flow divider module (113) is installed between the two side plates (112). A locking heating coil (114) is fitted on the outer surface of the cylindrical flow divider module (113). A feed nozzle assembly (115) is fixed at the front end of the cylindrical flow divider module (113). A discharge nozzle assembly (116) is fixed at the upper end of the cylindrical flow divider module (113). A flow channel (117) is opened inside the cylindrical flow divider module (113) and connects the feed nozzle assembly (115) and the discharge nozzle assembly (116). A power unit (12) is disposed on the main body component (11) and is used to provide linear driving force.

2. The oil pressure push plate type cylindrical splitter synchronous injection molding system according to claim 1, characterized in that: The power assembly (12) includes cylinders (121) symmetrically arranged on both sides inside the template (111). A push plate (122) is rigidly connected between the output ends of the cylinders (121) on both sides. A valve needle (123) that can move axially is provided inside the discharge nozzle assembly (116). The push plate (122) drives the valve needle (123) to move synchronously in a straight line.

3. The oil pressure push paddle type cylindrical splitter synchronous injection molding system according to claim 1, characterized in that: The power assembly (12) also includes a pressure compensation valve (124) located at the rear end of the template (111), and the pressure compensation valve (124) is connected to the hydraulic circuit of the oil cylinder (121).

4. The oil pressure push paddle type cylindrical splitter synchronous injection molding system of claim 1, wherein: The power assembly (12) also includes a disc spring assembly (125) disposed inside the push plate (122), and the disc spring assembly (125) is located at the bottom of the valve needle (123) and in contact with it.

5. The oil pressure push paddle type cylindrical splitter synchronous injection molding system of claim 1, wherein: The power assembly (12) also includes linear guide rails (126) fixed on both sides of the top of the template (111), and the push plate (122) is slidably connected to the linear guide rails (126).

6. The hydraulic pusher-type cylindrical manifold synchronous injection molding system according to claim 1, characterized in that: The main component (11) also includes a connector (118) fixed in the middle of the top of the template (111), and the upper end of the connector (118) is fixed to the bottom of the cylindrical diverter module (113).

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