One-step injection molding mechanism

Abstract

The invention discloses a one-step injection molding mechanism, and relates to the technical field of injection molding, and the one-step injection molding mechanism comprises a rack, a shunting assembly, a plurality of hot nozzles and a valve needle assembly; the shunting assembly comprises a shunting plate, a main injection nozzle and an ejection rod; the splitter plate is arranged on the rack and is provided with a plurality of sub-runners; the main injection nozzle is arranged on the splitter plate and injects the melt into each sub-runner; the hair rod is arranged in the splitter plate so as to heat the melt flowing through each sub-runner; the hot nozzles are arranged on the splitter plate at intervals along the length direction of the rack; each hot nozzle forms a hot nozzle runner which is communicated with one sub-runner; each hot nozzle runner is gradually shrunk along the vertical upward direction; the valve needle assembly comprises an air cylinder and a plurality of valve needles, and each valve needle is arranged in one hot nozzle runner in a penetrating mode. The air cylinder drives the valve needles to vertically move so as to block the openings in the ends, away from the air cylinder, of the hot nozzle runners. The invention aims to reduce the probability of obvious flow marks of the product in the injection molding process.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a one-step injection molding mechanism. Background Technology

[0002] One-step injection-blow molding is an advanced manufacturing technology that integrates injection molding and blow molding into a single mold. It boasts significant advantages such as high production efficiency, excellent product consistency, and low energy consumption, and is widely used in food packaging, pharmaceutical packaging, and other fields. This process first injects molten plastic into the mold cavity through a hot runner system to form a preform, and then completes the blow molding process at the same station. This places extremely high demands on the temperature control precision, melt flow balance, and heat distribution uniformity of the hot runner system.

[0003] In existing technologies, one-step hot runner systems typically include components such as a main nozzle, manifold, hot nozzle, valve needle drive, and cooling system. However, in actual production processes, dead zones or cold glue residue may exist in the hot nozzle runner, causing cold glue to flow into the mold cavity in the gate area after injection molding, forming obvious flow marks in subsequent blow molding processes and affecting the appearance quality of the product. Summary of the Invention

[0004] The main objective of this invention is to propose a one-step injection molding mechanism that aims to reduce the likelihood of noticeable flow marks appearing on products during the injection molding process.

[0005] To achieve the above objectives, the present invention proposes a one-step injection molding mechanism, comprising: frame; The flow splitting assembly includes a flow splitting plate, a main nozzle, and a heating rod; the flow splitting plate is disposed on the frame and has multiple flow splitting channels; the main nozzle is disposed on the flow splitting plate and injects melt into each of the flow splitting channels; the heating rod is disposed inside the flow splitting plate to heat the melt flowing through each of the flow splitting channels. Multiple hot nozzles are spaced apart on the flow divider plate along the length of the frame; each hot nozzle forms a hot nozzle flow channel that communicates with a flow divider channel; each hot nozzle flow channel gradually narrows in the vertically upward direction. A valve needle assembly includes a cylinder and a plurality of valve needles, each valve needle being inserted into a hot nozzle flow channel; the cylinder drives each valve needle to move vertically to block the opening at the end of each hot nozzle flow channel away from the cylinder.

[0006] In one embodiment, the hot nozzle flow channel includes a plurality of flow channel segments connected in sequence, wherein the inner diameter of the flow channel segment closer to the cylinder is larger than the inner diameter of the flow channel segment farther from the cylinder in any two adjacent flow channel segments.

[0007] In one embodiment, the inner diameter of the topmost flow channel section is uniform and equal to the outer diameter of the corresponding valve needle at the end furthest from the cylinder.

[0008] In one embodiment, the one-step injection molding mechanism further includes a plurality of heating wires, each of which is wound around the outer periphery of a hot nozzle at the end away from the cylinder to heat the melt in the hot nozzle flow channel.

[0009] In one embodiment, the one-step injection molding mechanism further includes a plurality of heat insulation caps, each heat insulation cap being disposed on a hot nozzle and covering the end of the corresponding hot nozzle flow channel away from the cylinder; the heat insulation cap has a through hole for the corresponding valve needle to pass through.

[0010] In one embodiment, the one-step injection molding mechanism further includes a nozzle assembly, which includes a plurality of cooling water jackets, each of which is fitted around the outer periphery of a hot nozzle at the end away from the cylinder.

[0011] In one embodiment, the nozzle assembly further includes a plurality of sealing heat insulation sleeves, each of the sealing heat insulation sleeves being fitted around the outer periphery of the end of a hot nozzle away from the cylinder, and each of the cooling water sleeves being fitted around the outer periphery of the corresponding sealing heat insulation sleeve.

[0012] In one embodiment, each valve needle passes through the manifold and is inserted into the corresponding hot nozzle; the valve needle assembly also includes a plurality of valve needle sleeves, each valve needle sleeve being fitted onto the end of the valve needle near the cylinder and snapped into the manifold.

[0013] In one embodiment, the diversion assembly includes two generator rods, which are vertically spaced within the diversion plate.

[0014] In one embodiment, the valve needle assembly further includes a cylinder plate, with each valve needle disposed on the cylinder plate, and the cylinder driving the cylinder plate to move vertically.

[0015] In the technical solution of this invention, the one-step injection molding mechanism includes a frame, a flow distribution assembly, multiple hot nozzles, and a valve needle assembly; the flow distribution assembly includes a flow distribution plate, a main nozzle, and a heating rod; the flow distribution plate is disposed on the frame and has multiple flow channels; the main nozzle is disposed on the flow distribution plate and injects melt into each flow channel; the heating rod is disposed inside the flow distribution plate to heat the melt flowing through each flow channel; each hot nozzle is spaced apart on the flow distribution plate along the length of the frame; each hot nozzle forms a hot nozzle flow channel and communicates with a flow channel; each hot nozzle flow channel gradually contracts in a vertically upward direction; the valve needle assembly includes a cylinder and multiple valve needles, each valve needle passing through a hot nozzle flow channel; the cylinder drives each valve needle to move vertically to block the opening at the end of each hot nozzle flow channel away from the cylinder. In the technical solution of this invention, by optimizing the geometry of the hot runner, the flow balance and temperature uniformity of the melt in the hot runner system are improved, and the problem of flow marks caused by cold glue residue in the gate area is solved, thereby improving the appearance quality and production efficiency of injection molded products. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a one-step injection molding mechanism according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a one-step injection molding mechanism; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0018] Explanation of icon numbers:

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] In the one-step injection blow molding process, the hot runner system's hot nozzle design has a flow dead zone problem, resulting in cold glue residue during melt flow. This cold glue residue is carried into the mold cavity during the injection stage, subsequently forming surface flow marks during the blow molding process, thus affecting product appearance quality and production consistency.

[0024] To address the above problems, this invention proposes a one-step injection molding mechanism 1000. Figure 1 , Figure 2 as well as Figure 3 This is a schematic diagram of an embodiment of the one-step injection molding mechanism 1000 provided by the present invention.

[0025] Please refer to Figure 1 , Figure 2 as well as Figure 3This invention proposes a one-step injection molding mechanism 1000, including a frame 1, a flow distribution assembly, multiple hot nozzles 3, and a valve needle assembly 42; the flow distribution assembly includes a flow distribution plate 21, a main nozzle 22, and a heating rod 23; the flow distribution plate 21 is disposed on the frame 1 and has multiple flow channels 21a; the main nozzle 22 is disposed on the flow distribution plate 21 and injects melt into each flow channel 21a; the heating rod 23 is disposed within the flow distribution plate 21 to heat the melt flowing through each flow channel 21a. The melt within 1a; each hot nozzle 3 is spaced apart on the flow divider plate 21 along the length of the frame 1; each hot nozzle 3 forms a hot nozzle flow channel 3a connected to a flow divider 21a; each hot nozzle flow channel 3a gradually narrows in the vertically upward direction; the valve needle 42 assembly includes a cylinder 41 and multiple valve needles 42, each valve needle 42 passing through a hot nozzle flow channel 3a; the cylinder 41 drives each valve needle 42 to move vertically to block the opening at the end of each hot nozzle flow channel 3a away from the cylinder 41.

[0026] The one-step injection molding mechanism 1000 is a device used to continuously complete injection molding and blow molding in the same mold a. Its core function is to accurately inject molten plastic into the cavity of mold a to form a preform, providing a foundation for subsequent blow molding. The frame 1 is the supporting structure of the entire one-step injection molding mechanism 1000, used to fix and support the various components in the mechanism, ensuring its stable operation and precise alignment. The manifold assembly is responsible for evenly distributing the molten plastic injected by the main nozzle 22 into multiple hot nozzle channels 3a. Its design is crucial to ensuring the filling balance of each mold cavity. The manifold plate 21 is the core part of the manifold assembly, with multiple manifold channels 21a inside, used to guide the melt from the main nozzle 22 to each hot nozzle 3. The manifold plate 21 can be designed as a flat plate structure with multiple manifold channels 21a. These manifold channels 21a can be radially, parallelly, or annularly distributed to adapt to the needs of different mold a layouts. The main nozzle 22 is the inlet for molten plastic to enter the manifold assembly, responsible for injecting the high-pressure melt from the injection molding machine into the manifold channels 21a of the manifold plate 21. The heating element 23 is typically built into the manifold plate 21 to heat the melt flowing through the manifold channels 21a, maintaining melt flowability and temperature uniformity. The heating element 23 can be embedded or wrapped around specific areas inside the manifold plate 21. For example, a resistance wire heating rod can be directly inserted into a pre-drilled hole in the manifold plate 21, or a heating coil can be used to surround the manifold plate 21 to heat the melt flowing through each manifold channel 21a, ensuring temperature uniformity during the manifold process. The manifold channels 21a are internal passages within the manifold plate 21, guiding the melt from the main nozzle 22 to each hot nozzle channel 3a. Their geometry and layout affect the melt flow balance. The hot nozzle 3 is a key component connecting the runner 21a and the mold cavity a. It forms a hot nozzle channel 3a internally, used to transport the molten material from the runner 21 to the mold cavity a. The hot nozzle channel 3a is a passage within the hot nozzle 3 through which the molten material enters the mold cavity a. Its structural design directly affects the flow state of the molten material and the quality of the gate. The valve needle 42 assembly is used to precisely control the flow and cut-off of the molten material within the hot nozzle channel 3a. By opening and closing the valve needle 42, effective control of the gate can be achieved, preventing leakage or stringing. The cylinder 41 is the driving device for the valve needle 42 assembly. Pneumatic pressure drives the valve needle 42 to move vertically, opening or blocking the hot nozzle channel 3a. The valve needle 42 is the core actuator in the valve needle 42 assembly. It passes through the hot nozzle channel 3a and controls the opening and closing of the hot nozzle channel 3a through its own movement, thereby controlling the injection of the molten material.

[0027] Multiple hot nozzles 3 are spaced apart along the length of the frame 1 on the manifold 21. These hot nozzles 3 can be connected to the manifold 21 by means of threaded fixing, clamping fixing, or flange connection. Each hot nozzle 3 forms a hot nozzle channel 3a, which communicates with a corresponding manifold 21a, thereby guiding the melt from the manifold 21 to the gate of mold a. Each hot nozzle channel 3a gradually tapers in the vertical upward direction. This taper design can be achieved in various ways; for example, the hot nozzle channel 3a can be designed as a tapered orifice with its inner diameter gradually decreasing from the bottom upward; or, the hot nozzle channel 3a can be formed by connecting multiple cylindrical segments with decreasing diameters in sequence. This gradually taper structure helps the melt form a more stable flow state before entering the mold cavity a and may affect the melt pressure and shear rate in the gate area. A valve needle 42 assembly is used to control the flow of melt within the hot nozzle channel 3a. The valve needle 42 assembly may include a cylinder 41 and multiple valve needles 42. Each valve needle 42 can be designed as a slender rod-like structure, with one end connected to the piston rod of the cylinder 41 and the other end passing through a corresponding hot nozzle channel 3a. The cylinder 41 can be fixed to a support structure above the frame 1, and the piston rod is driven by air pressure to move each valve needle 42 vertically. When the valve needle 42 moves downward, its conical or cylindrical end can engage with the constricted portion of the hot nozzle channel 3a, thereby blocking the opening of the end of the hot nozzle channel 3a away from the cylinder 41 and cutting off the melt flow. When the valve needle 42 moves upward, it opens the channel, allowing melt injection. The stroke and speed of the valve needle 42 can be adjusted by the control system of the cylinder 41 to achieve precise control of the injection molding process.

[0028] The following example will provide a more detailed explanation of the above technical solution: On a one-step injection blow molding production line, a batch of PET preforms needs to be produced. This production line is equipped with the one-step injection molding mechanism 1000 of this embodiment. During production, PET plastic granules are first heated and melted in the barrel of the injection molding machine to form a highly fluid melt. Subsequently, the melt is injected through the nozzle of the injection molding machine, via the main nozzle 22, into the manifold 21 of the manifold assembly. Within the manifold 21, the melt is evenly distributed into multiple manifold channels 21a. Because the heating rod 23 is located within the manifold 21, it continuously heats the melt flowing through each manifold channel 21a, ensuring that the melt maintains a stable temperature and fluidity during the manifolding process, avoiding viscosity increases or localized solidification due to temperature drops. After flowing out of the manifold channel 21a, the melt enters multiple hot nozzle channels 3a connected to the manifold channel 21a. Each hot nozzle channel 3a gradually contracts in a vertically upward direction. This contraction design allows for adjustments to the flow rate and pressure distribution of the melt as it flows towards the gate of mold a. When the melt reaches the end of the hot runner 3a, i.e., the opening furthest from the cylinder 41, the valve pin 42 assembly activates. Upon receiving a control signal, the cylinder 41 within the valve pin 42 assembly drives multiple valve pins 42 to move vertically downwards synchronously. The end of each valve pin 42 precisely inserts into and blocks the opening of the corresponding hot runner 3a furthest from the cylinder 41. During the injection molding stage, the valve pins 42 lift upwards, opening the hot runner 3a and allowing the melt to be injected into the cavity of mold a, forming a preform. After injection molding is complete, the valve pins 42 quickly move downwards, blocking the opening of the hot runner 3a, thus achieving precise gate closure. The blocking action of the valve needle 42 effectively prevents dripping or stringing of the melt in the gate area. Furthermore, because the hot nozzle channel 3a gradually contracts vertically upwards, the valve needle 42 can more effectively push the melt out of the channel during blocking, reducing the possibility of melt residue. This avoids cold glue flowing into the mold cavity in the gate area, thus preventing flow marks in subsequent blow molding processes and ensuring the appearance quality of the preform.

[0029] Specifically, the heating rod 23 in this flow distribution assembly continuously heats the melt, ensuring temperature uniformity during the flow distribution process. This contrasts with the potential for localized overcooling or overheating in existing technologies. More importantly, the structure of each hot nozzle channel 3a gradually narrowing vertically upwards allows the melt to form a more concentrated flow stream as it flows towards the gate, reducing melt retention on the channel walls. When the cylinder 41 in the valve needle 42 assembly drives the valve needle 42 to move vertically to block the opening of the hot nozzle channel 3a away from the cylinder 41, the conical or constricted end of the valve needle 42 closely engages with the constricted portion of the hot nozzle channel 3a, more thoroughly pushing the melt out of the channel and preventing the accumulation of cold glue in the gate area. Compared to traditional hot nozzle channel 3a designs, the solution in this embodiment can more effectively remove cold glue from the gate area, thereby significantly reducing the risk of cold glue flowing into the mold cavity.

[0030] Therefore, the one-step injection molding mechanism 1000 of this embodiment forms a synergistic overall technical solution through the precise temperature control of the flow distribution component, the optimized geometry of the hot runner channel 3a, and the precise blocking mechanism of the valve needle 42 component. This solution not only improves the flow balance and temperature uniformity of the melt in the hot runner system, but more importantly, it fundamentally solves the technical problem of flow marks caused by cold glue residue in the gate area, thereby improving the appearance quality and production efficiency of the injection molded products.

[0031] Please refer to Figure 3 In one embodiment of the present invention, the hot nozzle flow channel 3a includes a plurality of flow channel segments connected in sequence, wherein the inner diameter of the flow channel segment closer to the cylinder 41 in two adjacent flow channel segments is larger than the inner diameter of the flow channel segment farther away from the cylinder 41.

[0032] The hot runner 3a comprises multiple sequentially connected runner segments. This means that the hot runner 3a is no longer a single, continuous contraction channel, but rather a series of sub-runners (runner segments) with different geometric shapes or sizes. These runner segments are spatially interconnected, forming the path for the melt to enter the mold cavity from the sub-runner 21a. For example, each runner segment can be cylindrical, conical, or a combination thereof, such as being composed of an upper cylindrical segment, a middle conical segment, and a lower cylindrical segment connected sequentially. Alternatively, the connection points of the runner segments can be designed as smoothly transitioning arcs to reduce shear stress during melt flow; they can also be designed as stepped connections for easier machining and dimensional control. The inner diameter of the runner segment closer to cylinder 41 in two adjacent runner segments is larger than that of the runner segment farther from cylinder 41, describing the decreasing dimensional relationship between the runner segments. That is, from the melt inlet (near cylinder 41) to the outlet (away from cylinder 41), the inner diameter of the runner gradually decreases. This is a stepped contraction structure.

[0033] The proposed solution designs the hot nozzle runner 3a as consisting of multiple sequentially connected runner segments, with the inner diameter of these runner segments decreasing in a stepped manner from the end closer to the cylinder 41 to the end farther away from the cylinder 41. When the melt is injected from the main nozzle 22 into the runner 21a of the manifold 21 and then into the hot nozzle runner 3a, the melt will flow sequentially through these runner segments with gradually decreasing inner diameters. This segmented, stepped inner diameter contraction design allows for more precise control of the melt's flow path and pressure gradient within the runner. Compared to continuously contracting runners, the stepped contraction can more effectively manage the melt's shear rate and temperature distribution, avoiding localized overheating or shear degradation. Simultaneously, this structure helps to form a stable melt front at the end of the runner, ensuring that the melt can fill the mold cavity uniformly and quickly. Furthermore, the vertical movement of the valve needle 42 within the hot nozzle flow channel 3a enables a more stable fit with the segmented flow channel walls. Especially when the valve needle 42 blocks the flow channel opening, the stepped inner diameter change can provide the valve needle 42 with a clearer guide and a more reliable sealing contact surface, thereby effectively preventing melt dripping or stringing and improving the quality and production efficiency of injection molded products.

[0034] Through the above technical solution, the hot nozzle runner 3a is designed to include multiple sequentially connected runner segments, with the inner diameter of adjacent runner segments decreasing in a stepped manner. This allows for more precise control of the melt flow state within the hot nozzle runner 3a. This structure helps optimize the melt pressure distribution and shear rate, reducing the risk of melt degradation within the runner, thereby improving the quality of injection molded products. Simultaneously, the segmented inner diameter design also makes the movement of the valve needle 42 within the runner more stable and achieves a more reliable sealing effect, effectively preventing melt dripping and improving the stability and efficiency of the injection molding process.

[0035] Please refer to Figure 3 In one embodiment of the present invention, the inner diameter of each part of the topmost flow channel section is the same, and is equal to the outer diameter of the corresponding valve needle 42 at the end away from the cylinder 41.

[0036] Specifically, the topmost flow channel section refers to the part of the hot nozzle flow channel 3a that is furthest from the cylinder 41 and closest to the mold cavity a. It is the final channel for the melt before entering the mold a and is also the key area for the valve needle 42 to seal. The design of this flow channel section directly affects the flow control and sealing effect of the melt.

[0037] The solution in this application designs the topmost flow channel section with a uniform inner diameter, and makes its inner diameter precisely equal to the outer diameter of the end of the corresponding valve needle 42 away from the cylinder 41. This ensures that when the valve needle 42 is closed, the sealing end of the valve needle 42 can form a tight, seamless fit with the final outlet of the hot nozzle flow channel 3a. During melt injection, the melt passes through the flow divider plate 21 and flow channel 21a of the flow divider assembly, and then through the hot nozzle flow channels 3a of multiple hot nozzles 3. When the cylinder 41 of the valve needle 42 assembly drives the valve needle 42 to move vertically to the closed position, the end of the valve needle 42 away from the cylinder 41 precisely inserts into and blocks the topmost flow channel section. Because the inner diameter of this flow channel section precisely matches the outer diameter of the valve needle 42 and is identical in size, the valve needle 42 can form a uniform and efficient seal, effectively preventing the melt from leaking from the hot nozzle flow channel 3a into the mold cavity a. This precise fit not only ensures complete cut-off of the melt, but also reduces friction and wear between the valve needle 42 and the flow channel wall, extending the service life of the component.

[0038] Through the above technical solution, the sealing accuracy and reliability between the valve needle 42 and the hot runner channel 3a are significantly improved. This precise dimensional matching and uniform sealing contact surface effectively prevent melt leakage and ensure the quality and consistency of injection molded products.

[0039] Please refer to Figure 3 In one embodiment of the present invention, the one-step injection molding mechanism 1000 further includes a plurality of heating wires 5, each heating wire 5 being wound around the outer periphery of a hot nozzle 3 at the end away from the cylinder 41 to heat the melt in the hot nozzle flow channel 3a.

[0040] The heating wire 5 is an electric heating element that provides heat by converting electrical energy into heat energy. The heating wire 5 can be implemented in various forms, such as resistance wire made of high-resistance materials like nickel-chromium alloy or iron-chromium-aluminum alloy, or using ceramic heating elements, PTC heating elements, etc. Its main function is to provide precise and controllable localized heating to a specific area. The heating wire 5 is wound around the outer periphery of a hot nozzle 3 at the end away from the cylinder 41. This arrangement means that the heating wire 5 is wrapped around the outer surface of the hot nozzle 3, particularly near the outlet end of the hot nozzle 3 (i.e., the end away from the cylinder 41). This winding method ensures that heat can be efficiently transferred to the body of the hot nozzle 3, and then to the melt within the hot nozzle flow channel 3a. Specifically, the heating wire 5 can be spirally wound around the outer wall of the hot nozzle 3, integrated into a heating sleeve surrounding the hot nozzle 3, or tightly fitted to the outer periphery of the hot nozzle 3 in other ways. The heating wire 5 is designed to heat the melt within the hot nozzle flow channel 3a. The localized heat provided by the heating wire 5 can effectively compensate for the heat loss that may occur when the melt flows through the hot nozzle channel 3a, thereby maintaining the optimal temperature and flow state of the melt before entering the mold cavity.

[0041] This application's solution, based on the aforementioned one-step injection molding mechanism 1000, adds multiple heating wires 5 and cleverly arranges them on the outer periphery of the end of each hot nozzle 3 furthest from the cylinder 41, thereby achieving localized and precise heating of the melt within the hot nozzle flow channel 3a. Specifically, when the melt is injected into the flow channel 21a of the manifold 21 through the main nozzle 22, it is first preheated by the heating rod 23 in the manifold assembly to ensure the basic fluidity of the melt within the flow channel 21a. Subsequently, the melt enters the hot nozzle flow channel 3a of each hot nozzle 3. Considering the risk of heat loss and melt temperature drop in the hot nozzle flow channel 3a, especially at its end, the heating wires 5 in this solution play a crucial role. The heating wires 5 convert electrical energy into heat energy, transferring heat to the hot nozzle 3 body, thereby efficiently heating the melt within the hot nozzle flow channel 3a. This localized heating, combined with the overall heating provided by the heating rod 23 in the manifold 21, forms a more complete temperature control system. The precise arrangement of the heating wire 5 ensures that the temperature is effectively maintained in the critical area where the melt is about to leave the hot nozzle 3 and enter the mold cavity. This avoids the increase in viscosity and the deterioration of fluidity caused by the drop in temperature, thus ensuring the temperature uniformity and flow stability of the melt throughout the flow channel. By adding a heating wire 5 to the one-step injection molding mechanism 1000 and winding it around the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41, the melt within the hot nozzle runner 3a can be locally heated. This localized heating effectively compensates for potential heat loss as the melt flows through the end of the hot nozzle runner 3a, ensuring that the melt remains at its optimal temperature and flow state before entering the mold cavity. This significantly improves melt flowability, reduces the risk of defects such as cold material and short shots during injection molding, thereby improving the quality and yield of injection-molded products. Simultaneously, precise temperature control at the end of the hot nozzle runner 3a also enhances the stability and controllability of the injection molding process.

[0042] Please refer to Figure 3 In one embodiment of the present invention, the one-step injection molding mechanism 1000 further includes a plurality of heat insulation caps 6, each heat insulation cap 6 being disposed on a hot nozzle 3 and covering the end of the corresponding hot nozzle flow channel 3a away from the cylinder 41; the heat insulation cap 6 has a through hole for the corresponding valve needle 42 to pass through.

[0043] Multiple heat insulation caps 6 are components used to reduce heat transfer and are typically made of low thermal conductivity materials. Their function is to provide external heat insulation protection for the hot nozzle 3, preventing heat loss. The heat insulation caps 6 can be made of ceramic materials, high-temperature resistant engineering plastics (such as polyetheretherketone, PEEK), or composite heat insulation materials. They can also be designed as hollow structures filled with air or inert gas to enhance the heat insulation effect. Each heat insulation cap 6 is located on a hot nozzle 3 and covers the end of the corresponding hot nozzle flow channel 3a away from the cylinder 41. This clearly defines the installation position and method of the heat insulation cap 6, ensuring that it can effectively cover the end of the hot nozzle flow channel 3a, forming a heat insulation barrier. The heat insulation caps 6 can be fixed to the outer periphery of the hot nozzle 3 by threaded connection, snap-fit ​​connection, or press fit. Alternatively, they can be designed as sleeve-shaped structures that match the shape of the hot nozzle 3 and are directly fitted onto the end of the hot nozzle 3. The heat insulation cap 6 has a through hole for the corresponding valve needle 42 to pass through, ensuring that the heat insulation cap 6 provides heat insulation without hindering the normal movement of the valve needle 42 and maintaining the valve needle 42 control function of the injection molding mechanism. The inner diameter of the through hole is usually slightly larger than the outer diameter of the valve needle 42 to ensure that the valve needle 42 passes through smoothly and to minimize heat loss; the inner wall of the through hole can be polished to reduce friction during the movement of the valve needle 42.

[0044] The solution of this application provides a heat insulation cap 6 at the end of the hot nozzle channel 3a furthest from the cylinder 41. This heat insulation cap 6 effectively prevents the conduction and radiation of heat from inside the hot nozzle 3a to the external environment, thereby maintaining the temperature of the melt at the end of the hot nozzle channel 3a. In the one-step injection molding mechanism 1000, the melt is heated from the manifold 21 through the blower 23, then enters the hot nozzle channel 3a, and is finally discharged under the control of the valve needle 42. Due to its structural characteristics and contact with the external environment, the end of the hot nozzle channel 3a is prone to heat loss. The heat insulation cap 6 ensures that the melt at the end of the hot nozzle channel 3a is maintained at a suitable injection temperature, avoiding problems such as increased melt viscosity, decreased fluidity, or even solidification and blockage caused by temperature drop. At the same time, the through hole on the heat insulation cap 6 allows the valve needle 42 to pass through, ensuring that the valve needle 42 can open and close normally, accurately controlling the injection of melt, thereby ensuring the stability of the injection molding process and product quality.

[0045] In one specific implementation, the heat insulation cap 6 can be a cylindrical sleeve made of ceramic fiber reinforced composite material. The heat insulation cap 6 is threaded to the end of the hot nozzle 3, ensuring a secure and airtight connection. The through-hole of the heat insulation cap 6 is a precision-machined circular hole with a finely polished inner wall to ensure minimal friction and smooth movement of the valve needle 42 when sliding within it. Furthermore, the external shape of the heat insulation cap 6 can be designed to fit tightly with the gate bushing of the mold a, further reducing heat loss and forming a highly efficient heat insulation barrier.

[0046] The above technical solution effectively reduces heat loss at the end of the hot runner channel 3a, maintains a stable melt temperature, thereby improving melt flowability, ensuring smooth injection molding, reducing defects caused by uneven temperature, and improving the quality and production efficiency of injection molded products. Meanwhile, since the valve needle 42 passes through the through-hole of the heat insulation cap 6, its movement is unaffected, ensuring precise control of the injection molding mechanism.

[0047] Please refer to Figure 2 and Figure 3 In one embodiment of the present invention, the one-step injection molding mechanism 1000 further includes a nozzle assembly, which includes a plurality of cooling water jackets 71, each cooling water jacket 71 being sleeved on the outer periphery of a hot nozzle 3 at the end away from the cylinder 41.

[0048] The nozzle assembly is an integrated component located at the end of the hot nozzle 3. Its main function is to provide additional functional support for the end of the hot nozzle 3, such as temperature control, sealing, or interface with the mold a. This assembly can be a single, integral structure or assembled from multiple sub-components, designed to optimize the behavior of the melt in the gate area. For example, the nozzle assembly can be designed as a detachable module for easy maintenance and replacement; or it can be integrated with the hot nozzle 3 body to enhance structural strength and heat transfer efficiency. The cooling water jacket 71 is a device for temperature control in a specific area. It typically has internal channels for circulating a cooling medium (such as water, oil, or air) to remove heat. The cooling water jacket 71 can take various structural forms; for example, it can be an annular sleeve with spiral cooling channels for efficient and uniform cooling; or it can contain multiple parallel straight-through cooling channels to simplify manufacturing and provide sufficient cooling capacity. The cooling water jacket 71 is fitted around the outer circumference of the end of the hot nozzle 3 away from the cylinder 41, meaning it is mounted in a circumferential manner on the outer surface of the end of the hot nozzle 3. This configuration ensures that cooling is applied directly and concentrated to the critical area where the hot nozzle 3 contacts the gate region of mold a, thereby achieving precise temperature control in that area. For example, the cooling water jacket 71 can be fixed to the outer periphery of the hot nozzle 3 by means of threaded connection, interference fit, or welding to ensure good thermal contact and structural stability.

[0049] By installing a nozzle assembly on the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41, which includes a cooling water jacket 71, precise temperature control of the tip of the hot nozzle 3 is achieved. During injection molding, the flow divider injects the melt into the hot nozzle runner 3a, where the melt remains in a high-temperature flowing state. As the melt is about to enter the mold cavity through the tip of the hot nozzle 3, the cooling medium circulating inside the cooling water jacket 71 continuously removes heat from the tip region of the hot nozzle 3. This localized and controlled cooling effectively reduces the temperature at the tip of the hot nozzle 3, causing the melt at the gate to solidify rapidly after the valve needle 42 closes. In this way, the main body of the hot nozzle 3 maintains the high-temperature fluidity of the melt, while its tip is rapidly cooled, avoiding problems such as melt overflow and stringing at the gate, while ensuring the molding quality of the injection molded part's gate area. This structural combination allows the hot nozzle 3 to maintain overall thermal balance while enabling precise temperature management of critical areas, thereby optimizing the stability of the injection molding process and product quality.

[0050] Through the above technical solution, in the one-step injection molding mechanism 1000, the nozzle assembly and its internal cooling water jacket 71 can achieve localized and precise temperature control of the end of the hot nozzle 3 furthest from the cylinder 41. This effectively solves the problems of melt overflow and stringing caused by continuous high temperature at the end of the hot nozzle 3, ensuring that the melt in the gate area can solidify quickly, thereby significantly improving the molding quality and surface finish of the injection molded parts. In addition, precise gate cooling also helps to shorten the injection molding cycle, improve production efficiency, and reduce the scrap rate.

[0051] However, in the process of implementing the above-mentioned injection molding mechanism, when the cooling water jacket 71 is directly fitted on the outer periphery of the end of the hot nozzle 3 away from the cylinder 41, the cooling water may directly carry away too much heat from the hot nozzle 3 body, causing the temperature of the hot nozzle 3 body to fluctuate, affecting the flow stability of the melt in the hot nozzle flow channel 3a, and may also cause unnecessary energy loss, affecting the quality and production efficiency of the injection molded parts.

[0052] To solve this problem, please refer to... Figure 2 and Figure 3 In one embodiment of the present invention, the nozzle assembly further includes a plurality of sealing heat insulation sleeves 72, each sealing heat insulation sleeve 72 being sleeved on the outer periphery of the end of a hot nozzle 3 away from the cylinder 41, and each cooling water sleeve 71 being sleeved on the outer periphery of the corresponding sealing heat insulation sleeve 72.

[0053] The sealing heat insulation sleeve 72 is a sleeve structure with heat insulation and auxiliary sealing functions. Its main function is to provide an effective heat insulation barrier between the hot nozzle 3 and the cooling water jacket 71, reducing the direct conduction of heat from the hot nozzle 3 to the cooling water jacket 71, while also helping to prevent melt leakage or coolant seepage. The sealing heat insulation sleeve 72 can be made of materials with low thermal conductivity, such as special ceramic materials, high-performance high-temperature resistant engineering plastics, or multi-layer composite materials. Alternatively, it can be designed as a hollow structure, filled with air or other insulating media to further enhance its heat insulation performance. The sealing heat insulation sleeve 72 is fitted around the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41, meaning that the heat insulation sleeve is spatially installed around a specific part of the hot nozzle 3. This installation method ensures that the sealing heat insulation sleeve 72 can effectively cover the area of ​​the hot nozzle 3 that needs heat insulation, namely the part that contacts or is close to the cavity of mold a, thereby precisely controlling the temperature of this area. The sealing heat insulation sleeve 72 can be designed as a cylindrical or conical structure that matches the shape of the hot nozzle 3, and is fixed to the outer periphery of the hot nozzle 3 by interference fit, threaded connection, or snap-fit. Alternatively, positioning grooves or bosses can be provided on the outer periphery of the hot nozzle 3 to ensure accurate positioning and installation of the sealing heat insulation sleeve 72. Each cooling water jacket 71 is respectively fitted onto the outer periphery of the corresponding sealing heat insulation sleeve 72, describing the stacked installation relationship between the cooling water jacket 71 and the sealing heat insulation sleeve 72. Through this stacked structure, the cooling water jacket 71 no longer directly contacts the hot nozzle 3, but is indirectly cooled through the sealing heat insulation sleeve 72, thereby achieving more precise control of the temperature at the end of the hot nozzle 3, reducing heat loss, and improving cooling efficiency. The cooling water jacket 71 can be designed to match the shape of the sealing heat insulation sleeve 72, and is installed on the outside of the sealing heat insulation sleeve 72 by tight fit or threaded connection. A small gap can be left between the cooling water jacket 71 and the sealing heat insulation sleeve 72, or it can be filled with a heat-conducting medium to optimize heat transfer or insulation effect.

[0054] The present application's solution involves sequentially covering the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41 with a sealing heat insulation sleeve 72 and a cooling water jacket 71. This allows the melt to be injected through the flow divider plate 21 and main nozzle 22 of the flow divider assembly, heated by the injector rod 23, and then entering the hot nozzle channels 3a of multiple hot nozzles 3. The hot nozzle channels 3a gradually narrow in the vertical upward direction, and the flow of the melt is controlled by the valve needle 42 of the valve needle 42 assembly. To effectively cool the end of the hot nozzle 3 furthest from the cylinder 41 during injection molding to solidify the gate, while avoiding unnecessary heat loss, the present application covers the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41 with a sealing heat insulation sleeve 72. This sealing heat insulation sleeve 72, as an intermediate layer between the hot nozzle 3 and the cooling water jacket 71, can effectively prevent the high temperature of the melt inside the hot nozzle 3 from being directly conducted to the external cooling water jacket 71. Subsequently, the cooling water jacket 71 is then covered around the outer periphery of the sealing heat insulation sleeve 72. When cooling water circulates in the cooling water jacket 71, its cooling effect first acts on the sealing and heat insulation jacket 72, and then the sealing and heat insulation jacket 72 indirectly affects the temperature of the hot nozzle 3. This layered structure makes the cooling process at the end of the hot nozzle 3 more controllable and efficient. Through the heat insulation effect of the sealing and heat insulation jacket 72, the amount of heat directly carried away by the cooling water from the hot nozzle 3 body can be reduced, thereby reducing cooling energy consumption and making the temperature gradient at the gate end of the hot nozzle 3 more ideal. This helps the melt to solidify quickly at the gate, while maintaining the temperature stability of the main body of the hot nozzle 3, avoiding problems such as premature solidification of the melt or blockage of the flow channel due to overcooling.

[0055] By sequentially fitting a sealing and heat-insulating sleeve 72 and a cooling water jacket 71 around the outer periphery of the end of the hot nozzle 3 furthest from the cylinder 41, the solution of this application can effectively improve the temperature control at the end of the hot nozzle 3. The presence of the sealing and heat-insulating sleeve 72 forms a thermal resistance barrier between the cooling water jacket 71 and the hot nozzle 3, significantly reducing the direct heat loss from the hot nozzle 3 body to the cooling water jacket 71, thereby reducing cooling energy consumption. At the same time, this indirect cooling method makes the cooling process at the gate end of the hot nozzle 3 more uniform and controllable, avoiding the problems of local overcooling or insufficient cooling, which helps the melt to solidify quickly and stably at the gate, improving the quality and production efficiency of injection molded parts. In addition, due to the reduction in heat loss, the temperature field distribution of the entire injection molding mechanism is also more reasonable, which is beneficial to extending the service life of the equipment.

[0056] Please refer to Figure 2 In one embodiment of the present invention, each valve needle 42 passes through the flow divider 21 and is inserted into the corresponding hot nozzle 3; the valve needle 42 assembly also includes a plurality of valve needle sleeves 43, each valve needle sleeve 43 being sleeved on one end of a valve needle 42 near the cylinder 41 and snapped into the flow divider 21.

[0057] Specifically, the valve needle sleeve 43 is an annular or cylindrical component used to support and guide the movement of the valve needle 42. Its function is to provide a stable movement trajectory for the valve needle 42, reduce direct friction between the valve needle 42 and surrounding components, and may also provide a sealing effect. The valve needle sleeve 43 can be made of wear-resistant and high-temperature-resistant materials, such as special steel, ceramics, or composite materials, to withstand the high temperature and high pressure conditions of the injection molding environment. Each valve needle sleeve 43 is fitted onto the end of a valve needle 42 near the cylinder 41, meaning that the valve needle sleeve 43 is installed in the upper region of the valve needle 42, i.e., near the connection between the valve needle 42 and the cylinder 41, typically where the valve needle 42 passes through the manifold 21. This positioning allows the valve needle sleeve 43 to effectively provide guidance and support before or during the passage of the valve needle 42 into the manifold 21 and the hot nozzle 3. The valve needle sleeve 43 is snapped into the manifold 21. This snapping method means that the valve needle sleeve 43 is firmly fixed inside the manifold 21 by a mating structure (e.g., interference fit, snap-fit, threaded connection, or structure with a slot). This fixing method ensures that the valve needle sleeve 43 will not loosen or shift during the operation of the injection molding mechanism, thereby providing continuous and stable guidance and support for the valve needle 42.

[0058] The solution of this application forms a stable guiding and supporting structure by placing the valve needle sleeve 43 at the end of the valve needle 42 near the cylinder 41 and engaging it within the manifold 21. When the cylinder 41 drives the valve needle 42 to move vertically, the valve needle sleeve 43 provides precise guidance within the manifold 21, ensuring that the valve needle 42 can smoothly and accurately pass through the manifold 21 and enter the hot nozzle flow channel 3a. This structure effectively avoids possible wobbling or deflection of the valve needle 42 during movement, thereby ensuring a good fit between the valve needle 42 and the hot nozzle flow channel 3a. At the same time, the presence of the valve needle sleeve 43 reduces direct friction between the valve needle 42 and the manifold 21, reduces wear, and helps to form an effective seal, preventing melt leakage from the gap between the valve needle 42 and the manifold 21. This integrated design makes the movement of the valve needle 42 more precise and reliable, significantly improving the overall performance and stability of the injection molding mechanism.

[0059] Please refer to Figure 2 In one embodiment of the present invention, the diversion assembly includes two generator rods 23, which are arranged vertically at intervals within the diversion plate 21.

[0060] The solution of this application involves setting two vertically spaced heating rods 23 within the manifold 21 of the manifold assembly, allowing the melt to receive heat supplementation from different vertical positions as it flows through multiple flow channels 21a of the manifold 21. When the main nozzle 22 injects melt into each flow channel 21a of the manifold 21, the melt flows within the flow channels 21a. At this time, the two heating rods 23 work together. One heating rod 23 may primarily be responsible for preheating or maintaining the initial temperature of the melt entering the manifold 21, while the other heating rod 23 may be responsible for further heating or compensating for heat loss in the melt flowing towards the hot nozzle 3a, ensuring temperature uniformity. This layered or regional heating method effectively overcomes the temperature unevenness that may occur when heating with a single heating rod 23, ensuring a more uniform temperature distribution of the melt throughout the manifold 21, thereby guaranteeing the viscosity consistency of the melt before entering the hot nozzle flow channel 3a. In this way, the melt can be injected into the mold cavity in a more stable state, providing high-quality melt for subsequent injection molding, thereby improving the molding stability and product quality of the entire one-step injection molding mechanism 1000.

[0061] By employing the aforementioned technical solution, two vertically spaced heating rods 23 are installed within the manifold 21 of the manifold assembly, significantly improving the temperature uniformity of the melt within the manifold 21. This multi-point, layered heating strategy effectively avoids the problems of localized overheating or underheating that may occur with a single heating source, ensuring a more stable and consistent viscosity of the melt before entering the hot nozzle 3. This not only helps improve the dimensional accuracy and surface quality of injection-molded products and reduce scrap rates but also optimizes the injection molding process window, enabling the one-step injection molding mechanism 1000 to operate more stably and efficiently, thereby improving overall production efficiency and economic benefits.

[0062] Please refer to Figure 2 In one embodiment of the present invention, the valve needle 42 assembly further includes a cylinder plate 44, each valve needle 42 is disposed on the cylinder plate 44, and the cylinder 41 drives the cylinder plate 44 to move vertically.

[0063] The cylinder plate 44 is a structural component whose main function is to serve as a platform for connecting and supporting multiple valve needles 42. The cylinder 41 drives the cylinder plate 44 to move vertically. The piston rod of the cylinder 41 can be directly connected to the cylinder plate 44 or through a suitable connector. When the cylinder 41 receives a control signal and actuates, its piston rod will produce a vertical linear motion, thereby driving the entire cylinder plate 44 to move synchronously in the vertical direction. This driving method ensures that the single driving force of the cylinder 41 can act evenly on all valve needles 42, achieving their overall synchronous movement.

[0064] The solution of this application introduces a cylinder plate 44 to uniformly transmit the driving force of the cylinder 41 to multiple valve needles 42. Specifically, the piston rod of the cylinder 41 is connected to the cylinder plate 44. When the cylinder 41 is activated, the vertical movement of its piston rod directly drives the entire cylinder plate 44 to move vertically. Since all valve needles 42 are firmly mounted on the cylinder plate 44, the overall vertical movement of the cylinder plate 44 forces all valve needles 42 to move vertically synchronously at the same speed and stroke. This linkage mechanism ensures that all valve needles 42 can simultaneously and consistently open or close the corresponding hot nozzle flow channel 3a, thereby achieving precise synchronous control of the melt flow at each injection point. In this way, a single driving source of the cylinder 41 can efficiently and stably control the coordinated action of multiple valve needles 42, avoiding the problems of asynchronous movement or uneven driving force that may be caused by independent driving or complex linkage mechanisms.

[0065] By employing the aforementioned technical solution, multiple valve needles 42 are uniformly mounted on a cylinder plate 44, and the cylinder plate 44 is driven by a cylinder 41 to move vertically as a whole. This effectively solves the problems of asynchronous movement, uneven driving force, and complex mechanisms associated with multiple valve needles 42 in multi-cavity injection molding. This structural design ensures that all valve needles 42 can achieve highly synchronized and stable opening and closing actions, thereby enabling each hot runner channel 3a to inject or cut off melt in the same state at the same time, greatly improving the consistency of melt flow in multi-cavity injection molding. This not only helps improve the quality of injection molded products and reduce scrap rates but also simplifies the driving mechanism of the valve needles 42, improving the operational reliability and maintenance convenience of the equipment.

[0066] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A one-step injection molding mechanism, characterized in that, include: frame; The splitter assembly includes a splitter plate, a main nozzle, and a firing rod; The flow divider plate is disposed on the frame, and the flow divider plate has multiple flow channels; The main nozzle is disposed on the flow divider plate and injects melt into each of the flow dividers; the generator is disposed inside the flow divider plate to heat the melt flowing through each of the flow dividers. Multiple hot nozzles are spaced apart on the flow divider plate along the length of the frame; each hot nozzle forms a hot nozzle flow channel that communicates with a flow divider channel; each hot nozzle flow channel gradually narrows in the vertically upward direction. A valve needle assembly includes a cylinder and a plurality of valve needles, each valve needle being inserted into a hot nozzle flow channel; the cylinder drives each valve needle to move vertically to block the opening at the end of each hot nozzle flow channel away from the cylinder.

2. The one-step injection molding mechanism as described in claim 1, characterized in that, The hot nozzle flow channel includes multiple flow channel segments connected in sequence, wherein the inner diameter of the flow channel segment closer to the cylinder is larger than the inner diameter of the flow channel segment farther away from the cylinder in any two adjacent flow channel segments.

3. The one-step injection molding mechanism as described in claim 2, characterized in that, The inner diameter of the topmost flow channel section is the same at all points, and is equal to the outer diameter of the corresponding valve needle at the end furthest from the cylinder.

4. The one-step injection molding mechanism as described in claim 1, characterized in that, The one-step injection molding mechanism also includes multiple heating wires, each of which is wound around the outer periphery of the end of a hot nozzle away from the cylinder, to heat the melt in the hot nozzle flow channel.

5. The one-step injection molding mechanism as described in claim 1, characterized in that, The one-step injection molding mechanism also includes multiple heat insulation caps, each heat insulation cap being disposed on a hot nozzle and covering the end of the corresponding hot nozzle flow channel away from the cylinder; the heat insulation cap has a through hole for the corresponding valve needle to pass through.

6. The one-step injection molding mechanism as described in claim 1, characterized in that, The one-step injection molding mechanism also includes a nozzle assembly, which includes multiple cooling water jackets, each of which is fitted around the outer periphery of the hot nozzle at the end away from the cylinder.

7. The one-step injection molding mechanism as described in claim 6, characterized in that, The nozzle assembly also includes multiple sealing and heat insulation sleeves, each of which is fitted around the outer periphery of the end of the hot nozzle away from the cylinder, and each of the cooling water sleeves is fitted around the outer periphery of the corresponding sealing and heat insulation sleeve.

8. The one-step injection molding mechanism as described in any one of claims 1 to 7, characterized in that, Each valve needle passes through the manifold and is inserted into the corresponding hot nozzle; the valve needle assembly also includes multiple valve needle sleeves, each valve needle sleeve being fitted onto the end of the valve needle near the cylinder and snapped into the manifold.

9. The one-step injection molding mechanism as described in any one of claims 1 to 7, characterized in that, The diversion assembly includes two generator rods, which are vertically spaced within the diversion plate.

10. The one-step injection molding mechanism as described in any one of claims 1 to 7, characterized in that, The valve needle assembly also includes a cylinder plate, and each valve needle is disposed on the cylinder plate. The cylinder drives the cylinder plate to move vertically.

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