A direct type two-point needle valve hot runner device

Abstract

This application relates to the technical field of injection molds, and in particular to a DC-type dual-point needle valve hot runner device, which includes a device body. The device body includes a feeding assembly, a needle valve, and a hydraulic drive assembly. The feeding assembly includes a main runner, a manifold, and a nozzle. The main runner is sequentially connected to the manifold and the nozzle. The manifold is used to divert the material in the main runner and inject it into the mold cavity through the nozzles. The needle valve is located inside the nozzle and is used to control the opening and closing of the upper gate of the nozzle. The hydraulic drive assembly includes a fixed base, a lifting base, and a housing. The housing, the fixed base, and the lifting base form an upper sealing cavity, and the fixed base and the lifting base form a lower sealing cavity. The hydraulic drive assembly of this application is integrated into the device body. The lifting base serves both as the driving function and as the installation reference for the needle valve. The structure is compact, occupies little space, and significantly improves the utilization rate of the internal space of the mold.

Description

Technical Field

[0001] This application relates to the technical field of injection molds, and in particular to a DC-type dual-point needle valve hot runner device. Background Technology

[0002] Needle valve hot runners are advanced gating systems widely used in the injection molding industry. By controlling the opening and closing of the gate through the lifting and lowering movement of the needle valve, they can achieve advantages such as precise supply of molten material, beautiful gate marks, no waste, and high production efficiency. They are commonly used in the automated injection molding production of appearance parts, precision plastic parts, and mass-produced products.

[0003] In injection molding of cylindrical and columnar products, if the molten material is fed into the cavity from only one side through a single gate, the flow path of the molten material in the cavity will be asymmetrical and the pressure distribution will be uneven. This will easily cause problems such as one-sided impact and feeding deviation, resulting in poor verticality, uneven wall thickness, and bending eccentricity of the product. To improve the above defects, a dual-point needle valve structure is usually adopted. However, dual-point needle valves require synchronous control. Existing dual-point needle valve drive structures mostly use external independent drive components, which are large in size and loosely arranged, resulting in low utilization of the internal space of the mold and complex assembly. They cannot meet the requirements of high-precision and compact molds. Summary of the Invention

[0004] To address the problem that existing dual-point needle valve drive structures are loosely external and difficult to adapt to precision and compact molds, this application provides a DC dual-point needle valve hot runner device.

[0005] This application provides a DC-type dual-point needle valve hot runner device, which adopts the following technical solution: A DC-type dual-point needle valve hot runner device includes a device body, which includes a feeding assembly, needle valves, and a hydraulic drive assembly. The feeding assembly includes a main channel, a manifold, and nozzles. The main channel is sequentially connected to the manifold and nozzles. The manifold is used to divert the material in the main channel and inject it into the mold cavity through the nozzles. The needle valves are located inside the nozzles and are used to control the opening and closing of the gate on the nozzles. The hydraulic drive assembly includes a fixed base, a lifting base, and a housing. An upper sealing cavity is formed between the housing, the fixed base, and the lifting base. A lower sealing cavity is formed between the fixed base and the lifting base. The lifting base is fixedly connected to all the needle valves. The upper sealing cavity and the lower sealing cavity are hydraulically driven by the lifting base to move up and down, thereby driving all the needle valves to move up and down synchronously.

[0006] By adopting the above technical solution, the material passes through the main channel, the manifold, and the nozzle in sequence to form a complete feeding flow path. After the material enters the manifold through the main channel, the manifold divides the material and guides it to the nozzle. The needle valve precisely controls the opening and closing of the gate in the nozzle. The hydraulic drive component drives the lifting seat to move up and down through the pressure difference between the upper and lower sealing chambers, thereby driving all needle valves to move synchronously and realizing the synchronous opening and closing of the dual gates. Compared with the prior art, the hydraulic drive component of this application is integrated into the device body. The lifting seat not only undertakes the driving function but also serves as the installation reference for the needle valve. The structure is compact, occupies little space, and significantly improves the utilization rate of the internal space of the mold.

[0007] Optionally, the fixed seat is sleeved on the outer periphery of the lifting seat, the housing is covered on the outside of the fixed seat and the lifting seat, and the lifting seat has a guide hole that slides with the outer wall of the main channel.

[0008] By adopting the above technical solution, the fixed seat is sleeved on the outer periphery of the lifting seat, and the housing is covered outside the fixed seat and the lifting seat to form a closed drive cavity structure. The lifting seat, as the driving component of the needle valve, directly utilizes the main channel for lifting and lowering, and slides with the outer wall of the main channel through the guide hole, without the need for an independent guide structure, thus enhancing the integrated layout of the device.

[0009] Optionally, the fixed base has a first liquid inlet and a second liquid inlet. The first liquid inlet is connected to the upper sealing cavity, and the second liquid inlet is connected to the lower sealing cavity. The first liquid inlet and the second liquid inlet are respectively connected to an external hydraulic source to realize hydraulic circulation.

[0010] By adopting the above technical solution, the first liquid inlet and the second liquid inlet are respectively connected to the upper sealing cavity and the lower sealing cavity. The first liquid inlet and the second liquid inlet are respectively connected to an external hydraulic source to form a complete hydraulic circulation loop. By alternately introducing pressure fluid into the upper sealing cavity or the lower sealing cavity, the lifting seat can be driven smoothly downward or upward, thereby controlling the needle valve to open or close the gate.

[0011] Optionally, the needle valve is provided with a flow guiding groove on its outer periphery. The flow guiding groove extends along the axial direction of the needle valve. The flow guiding groove moves up and down with the needle valve and corresponds to the gate to open the gate or is misaligned to close the gate.

[0012] By adopting the above technical solution, when the needle valve rises, the guide groove is connected to the gate, and the material can flow along the groove through the gate and enter the mold cavity. When the needle valve falls, the guide groove and the gate are misaligned, and the outer wall of the needle valve seals and closes the gate, thus achieving precise opening and closing of the gate.

[0013] Optionally, the flow divider plate is provided with a flow divider channel, which includes an inlet section and an outlet section that are interconnected. The inner diameter of the inlet section is larger than the inner diameter of the outlet section. The inlet section is connected to the main flow channel, and the outlet section is connected to the nozzle.

[0014] By adopting the above technical solution, the inner diameter of the inlet section is larger than that of the outlet section. The larger inner diameter of the inlet section can reduce the resistance to material flow and facilitate the reception of material from the main channel. The outlet section is connected to the nozzle. The smaller inner diameter of the outlet section can appropriately increase the material discharge pressure and stability, so that the material flow rate is stable and the pressure is uniform during the diversion process, avoiding flow fluctuations and impacts, ensuring symmetrical and consistent dual-path discharge, and improving the uniformity of product wall thickness and forming accuracy.

[0015] Optionally, the flow divider plate has a through hole that slides with the needle valve, and the end of the outlet section extends to the inner wall of the through hole.

[0016] By adopting the above technical solution, the through hole provides lifting and lowering guidance for the needle valve. After the material flows out from the outlet section, it directly enters the gap between the needle valve and the through hole, and then flows from the gate to the mold cavity. The flow path is compact, reducing material stagnation dead corners and flow loss.

[0017] Optionally, the flow divider plate is provided with a wiring groove, which is arranged in a ring around the outer periphery of the flow divider plate. A heating tube is embedded in the wiring groove. A heat-conducting plate is detachably installed on the flow divider plate, which covers the heating tube to conduct heat evenly to the flow divider plate.

[0018] By adopting the above technical solution, the heating tube is embedded in the wiring groove to achieve uniform heating of the flow divider plate. In addition, the heat conduction plate efficiently conducts the heat of the heating tube to each area of ​​the flow divider plate, so that the internal temperature distribution of the flow divider plate is balanced, thereby achieving stable material flow.

[0019] Optionally, a sprue seat and a sprue sleeve are installed at the end of the nozzle. The sprue seat is fixedly connected to the nozzle, and the sprue sleeve is detachably installed on the sprue seat and is configured to correspond one-to-one with the needle valve.

[0020] By adopting the above technical solution, the two gate bushings share the same gate seat for positioning, ensuring that the two gate positions are symmetrical, have high coaxiality, and stable spacing. This fundamentally avoids the positional deviation caused by separate positioning and assembly of the split structure, ensuring that the two gates can accurately correspond to the needle valve and the mold cavity, thereby ensuring the synchronization and uniformity of material feeding from both paths.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The hydraulic drive component of this application is integrated into the device body. The lifting seat not only undertakes the driving function but also serves as the installation reference for the needle valve. It has a compact structure, occupies little space, and significantly improves the utilization rate of the internal space of the mold. 2. The fixed seat is sleeved on the outer periphery of the lifting seat, and the housing is covered on the outside of the fixed seat and the lifting seat to form a closed drive cavity structure. The lifting seat is the driving component of the needle valve. Its lifting directly utilizes the main channel, passes through the guide hole and slides with the outer wall of the main channel. There is no need to set up an independent guide structure, which enhances the integrated layout of the device. 3. The two gate bushings share the same gate seat to achieve integrated positioning. Relying on the precise fixation of the gate seat and the nozzle, the installation benchmark of the two gate bushings is consistent. This fundamentally avoids the positional deviation caused by separate positioning and assembly in the split structure, ensuring that the two gate positions are symmetrical, have high coaxiality, and stable spacing. This allows the two gates to accurately correspond to the needle valve and the mold cavity, thereby ensuring the synchronization and uniformity of material feeding from both paths and reducing problems such as uneven product wall thickness, eccentricity, and appearance defects caused by gate positioning deviation. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the present application, used to illustrate the overall structure of the device body; Figure 2 A partial cross-sectional view of an embodiment of this application. Figure 1 This is used to demonstrate the specific structure of the hydraulic drive assembly; Figure 3 This is a partial structural diagram of an embodiment of this application. Figure 1 This is used to show the location of the first liquid inlet and the second liquid inlet; Figure 4 A partial cross-sectional view of an embodiment of this application. Figure 2 This is used to show the location of the branch channel; Figure 5 This is a partial structural diagram of an embodiment of this application. Figure 2 This is used to show the placement of the wiring channels and heat-conducting plates; Figure 6 A partial cross-sectional view of an embodiment of this application. Figure 3 This is used to show the location of the through hole; Figure 7 This is a partial structural diagram of an embodiment of this application. Figure 3 This is used to show the placement of the sprue holder and sprue sleeve.

[0023] Reference numerals: 1. Device body; 2. Feeding assembly; 211. Main channel; 212. Heating jacket; 221. Diverter plate; 222. Diverter channel; 223. Inlet section; 224. Outlet section; 225. Wiring trough; 226. Heat-conducting plate; 227. Through hole; 231. Nozzle; 232. Sprue seat; 2321. Mounting hole; 233. Sprue sleeve; 3. Needle valve; 311. Guide groove; 4. Hydraulic drive assembly; 411. Fixing seat; 412. First liquid inlet; 413. Second liquid inlet; 414. Guide groove; 421. Lifting seat; 422. Guide hole; 431. Housing; 5. Upper sealing cavity; 511. First seal; 512. Second seal; 513. Third seal; 6. Lower sealing cavity. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0025] Example: A DC dual-point needle valve hot runner device, reference Figure 1 and Figure 2 The device includes a main body 1, which includes a feeding assembly 2, a needle valve 3, and a hydraulic drive assembly 4. The feeding assembly 2 includes a main channel 211, a manifold 221, and a nozzle 231. The main channel 211, manifold 221, and nozzle 231 are fixedly connected and interconnected from top to bottom to form a complete molten material feeding path. The main channel 211 is responsible for the initial introduction of material. The manifold 221 is used to divide and equalize the material conveyed by the main channel 211. Finally, the material is accurately injected into the mold cavity through the gate on the nozzle 231. The needle valve 3 is installed inside the nozzle 231. The up and down movement of the needle valve 3 can realize the opening and closing control of the gate. The hydraulic drive assembly 4 includes a fixed base 411 and a lifting mechanism. The base 421 and the housing 431 are coaxially arranged. The housing 431, the fixed base 411 and the lifting base 421 form an upper sealing cavity 5, and the lifting base 421 and the fixed base 411 form a lower sealing cavity 6. The upper sealing cavity 5 and the lower sealing cavity 6 are connected by a hydraulic oil circuit. By adjusting the hydraulic oil pressure difference between the upper sealing cavity 5 and the lower sealing cavity 6, the lifting base 421 is driven to move up and down. All needle valves 3 are fixedly installed at the bottom of the lifting base 421 and move synchronously with the lifting base 421, thereby realizing the synchronous opening and closing control of all nozzles 231. The lifting base 421 is used to install needle valves 3 and also undertakes hydraulic actuation functions, which improves the structural compactness of the device.

[0026] refer to Figure 2 and Figure 3The fixed seat 411, the lifting seat 421 and the housing 431 are all cylindrical structures and are coaxially arranged. The fixed seat 411 is sleeved on the outer periphery of the lifting seat 421. The lifting seat 421 can slide up and down in the fixed seat 411 along the axial direction. The housing 431 is sleeved on the outer periphery of the fixed seat 411 and the lifting seat 421 to form the upper sealing cavity 5. The inner wall of the housing 431 is in contact with the outer edge surface of the fixed seat 411 to form the upper sealing surface of the upper sealing cavity 5. The inner wall of the fixed seat 411 is in contact with the outer edge surface of the lifting seat 421 to separate the upper sealing cavity 5 and the lower sealing cavity 6.

[0027] refer to Figure 2 and Figure 3 A first sealing element 511 is installed at the connection between the housing 431 and the lifting seat 421. The first sealing element 511 is located at the top of the upper sealing cavity 5 to ensure the sealing of the upper sealing cavity 5. A second sealing element 512 and a third sealing element 513 are provided between the inner wall of the fixed seat 411 and the outer edge of the lifting seat 421. The second sealing element 512 is located between the upper sealing cavity 5 and the lower sealing cavity 6, and the third sealing element 513 is located at the bottom of the lower sealing cavity 6. In this embodiment, the first sealing element 511, the second sealing element 512 and the third sealing element 513 are all made of high-temperature resistant fluororubber material, specifically sealing rings, to achieve isolation between the upper sealing cavity 5 and the lower sealing cavity 6 and the external environment, as well as complete isolation between the upper sealing cavity 5 and the lower sealing cavity 6.

[0028] refer to Figure 2 and Figure 3 The lifting seat 421 has a guide hole 422 that passes through the upper and lower end faces of the lifting seat 421. During the up and down sliding process of the lifting seat 421, the guide hole 422 slides and engages with the outer wall of the main channel 211 to ensure that the lifting seat 421 moves smoothly. There is no need to set up an additional guide structure. The lifting seat 421 can also play a positioning role for the main channel 211, which simplifies the overall structural layout. The housing 431 has a round hole for the main channel 211 to pass through. The round hole is coaxial with the guide hole 422 to avoid interference between the hydraulic drive component 4 and the main channel 211.

[0029] refer to Figure 2 and Figure 3 The fixed base 411 has a first liquid inlet 412 and a second liquid inlet 413. The first liquid inlet 412 is located on the outer edge of the fixed base 411. The outer edge is also provided with a guide groove 414. The end of the guide groove 414 extends into the upper sealing cavity 5. The first liquid inlet 412 is connected to the upper sealing cavity 5 through the guide groove 414. The second liquid inlet 413 is located on the inner edge of the fixed base 411. The second liquid inlet 413 is directly connected to the lower sealing cavity 6. The first liquid inlet 412 and the second liquid inlet 413 are respectively connected to an external hydraulic source through hydraulic pipelines to form a complete hydraulic circulation loop.

[0030] refer to Figure 2 and Figure 3 During operation, pressurized hydraulic oil is supplied to the upper sealing chamber 5 via an external hydraulic power source. The hydraulic oil pushes the lifting seat 421 downward, which in turn drives the needle valve 3 downward, closing the gate of the nozzle 231. Pressurized hydraulic oil is supplied to the second inlet 413 via an external hydraulic power source, and then combined with... Figure 1 Hydraulic oil pushes the lifting seat 421 upward, which in turn moves the needle valve 3 upward, opening the sprue of the nozzle 231. The two inlets are independently controlled to ensure that the lifting action of the needle valve 3 is accurate and reliable. At the same time, the first inlet 412 and the second inlet 413 are integrated inside the fixed seat 411, without occupying additional external space of the device, further optimizing the compact layout of the drive components.

[0031] refer to Figure 4 and Figure 5 The flow divider 221 has a flow divider channel 222 inside, which includes an inlet section 223 and an outlet section 224. The inlet section 223 is connected to the main flow channel 211, and the outlet section 224 is connected to the liquid inlet of each nozzle 231. The inner diameter of the inlet section 223 is larger than the inner diameter of the outlet section 224. The inlet section 223 is used to receive the material from the main flow channel 211. The larger inner diameter can reduce the resistance of the material entering the flow divider channel 222, combined with... Figure 6 The outlet section 224 is provided in two sets, each set containing two outlet sections 224, corresponding to the left and right nozzles 231 respectively. The inner diameter of the outlet section 224 is small, which can appropriately increase the material flow rate and avoid the material from condensing or stagnating due to the low flow rate during the diversion process, thus ensuring the uniformity of dual-path feeding.

[0032] refer to Figure 4 and Figure 5 A heating sleeve 212 is fitted around the outer periphery of the main channel 211 to heat the material flowing through the main channel 211. A wiring groove 225 is provided around the outer periphery of the diversion plate 221. The wiring groove 225 is arranged in a ring along the outer edge of the diversion plate 221. A heating tube is embedded in the wiring groove 225 to heat the entire diversion plate 221. A heat-conducting plate 226 can also be detachably installed on the diversion plate 221. The heat-conducting plate 226 covers the outside of the heating tube. In this embodiment, the heat-conducting plate 226 is specifically a copper block. Two heat-conducting plates 226 are provided and located on opposite sides of the diversion plate 221. The high thermal conductivity of copper is used to quickly and evenly conduct the heat from the heating tube to both sides of the diversion plate 221, ensuring that the material maintains a suitable temperature in the diversion channel 222.

[0033] refer to Figure 5 and Figure 6The manifold 221 has through holes 227 that penetrate the upper and lower surfaces of the manifold 221. The size and number of through holes 227 correspond one-to-one with the needle valves 3, ensuring that the needle valves 3 can move smoothly up and down within the through holes 227, and also guiding and limiting the needle valves 3 to prevent them from deviating during movement. This ensures precise alignment between the needle valves 3 and the nozzle 231 gate. Figure 4 The end of the outlet section 224 of the diversion channel 222 extends to the inner wall of the through hole 227, so that after the material flows out of the diversion channel 222, it can directly enter the gap between the needle valve 3 and the through hole 227, and then flow along the outer periphery of the needle valve 3 to the gate of the nozzle 231, which shortens the flow path of the molten material and reduces the residence time of the material in the diversion plate 221.

[0034] refer to Figure 6 and Figure 7 The nozzle 231 is equipped with a sprue seat 232 and a sprue sleeve 233. The sprue seat 232 is fixedly connected to the lower end face of the nozzle 231. The sprue seat 232 is an integral structure with two symmetrical mounting holes 2321 inside. The inner wall of the mounting hole 2321 is provided with internal threads, and the outer wall of the sprue sleeve 233 is provided with external threads. The two sprue sleeves 233 are respectively detachably installed in the mounting holes 2321 of the sprue seat 232 through threads, and are set one-to-one with the needle valve 3. The two sprue sleeves 233 share the same sprue seat 232 for positioning. Compared with the split sprue seat 232 design, there is no need to position and assemble the two sprue seats 232 separately, which can effectively ensure the positional symmetry, coaxiality and spacing stability of the two sprues.

[0035] refer to Figure 6 and Figure 7 The needle valve 3 has a flow guide groove 311 on its outer periphery. The flow guide groove 311 extends along the axial direction of the needle valve 3, and multiple flow guide grooves 311 are provided along the circumference of the needle valve 3. The flow guide groove 311 is connected to the gate of the gate sleeve 233. After the material enters the gap between the needle valve 3 and the through hole 227 of the flow divider plate 221, it flows smoothly through the gate along the flow guide groove 311 and is injected into the mold cavity. When the lifting seat 421 drives the needle valve 3 to move downward, the flow guide groove 311 and the gate are misaligned, and the outer wall of the needle valve 3 completely seals the gate, thereby closing the gate.

[0036] The implementation principle of this application embodiment is as follows: The external injection molding machine sends the material into the main channel 211. The material enters the manifold 221 through the main channel 211. After being buffered and pressure-equalized by the inlet section 223, it is evenly distributed to two sets of outlet sections 224. The material flows from the outlet section 224 into the gap between the needle valve 3 and the through hole 227, waiting to be injected into the mold cavity. Pressure hydraulic oil is introduced into the lower sealing cavity 6 through the external hydraulic source. The hydraulic oil pushes the lifting seat 421 to move upward, which in turn drives the needle valve 3 to move upward. When the guide groove 311 of the needle valve 3 corresponds to the gate, the material is injected into the same mold cavity simultaneously along the guide groove 311 of the two needle valves 3, realizing double-point symmetrical feeding. When the mold cavity is full, pressure hydraulic oil is introduced into the upper sealing cavity 5. The lifting seat 421 drives all needle valves 3 to move downward simultaneously. When the guide groove 311 of the needle valve 3 is misaligned with the gate, the outer wall of the needle valve 3 simultaneously seals the corresponding gate, completing the feeding and sealing control of one double-gate injection molding.

[0037] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A DC-type dual-point needle valve hot runner device, comprising a device body (1), characterized in that: The device body (1) includes a feeding assembly (2), a needle valve (3), and a hydraulic drive assembly (4). The feeding assembly (2) includes a main channel (211), a manifold (221), and a nozzle (231). The main channel (211) is sequentially connected to the manifold (221) and the nozzle (231). The manifold (221) is used to divert the material in the main channel (211) and inject it into the mold cavity through the nozzle (231). The needle valve (3) is located inside the nozzle (231) and is used to control the opening and closing of the gate on the nozzle (231). The hydraulic drive assembly (4) includes a fixed seat (411), a lifting seat (421), and a housing (431). An upper sealing cavity (5) is formed between the housing (431), the fixed seat (411), and the lifting seat (421). A lower sealing cavity (6) is formed between the fixed seat (411) and the lifting seat (421). The lifting seat (421) is fixedly connected to all the needle valves (3). The upper sealing cavity (5) and the lower sealing cavity (6) are hydraulically driven to move the lifting seat (421) up and down to drive all the needle valves (3) to move up and down synchronously.

2. The DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The fixed seat (411) is sleeved on the outer periphery of the lifting seat (421), and the housing (431) covers the outside of the fixed seat (411) and the lifting seat (421). The lifting seat (421) has a guide hole (422) that slides with the outer wall of the main channel (211).

3. The DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The fixed base (411) has a first liquid inlet (412) and a second liquid inlet (413). The first liquid inlet (412) is connected to the upper sealing cavity (5), and the second liquid inlet (413) is connected to the lower sealing cavity (6). The first liquid inlet (412) and the second liquid inlet (413) are respectively connected to an external hydraulic source to realize hydraulic circulation.

4. The DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The needle valve (3) has a flow guide groove (311) on its outer periphery. The flow guide groove (311) extends along the axial direction of the needle valve (3). The flow guide groove (311) rises and falls with the needle valve (3) to correspond to the gate so as to open the gate or to be misaligned to close the gate.

5. A DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The flow divider plate (221) is provided with a flow divider channel (222), which includes an inlet section (223) and an outlet section (224) that are connected to each other. The inner diameter of the inlet section (223) is larger than the inner diameter of the outlet section (224). The inlet section (223) is connected to the main flow channel (211), and the outlet section (224) is connected to the nozzle (231).

6. A DC-type dual-point needle valve hot runner device according to claim 5, characterized in that: The flow divider plate (221) has a through hole (227) that slides with the needle valve (3), and the end of the outlet section (224) extends to the inner wall of the through hole (227).

7. A DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The diverter plate (221) is provided with a wiring groove (225), which is arranged in a ring around the outer periphery of the diverter plate (221). A heating tube is embedded in the wiring groove (225). A heat-conducting plate (226) is detachably installed on the diverter plate (221), which covers the heating tube to conduct heat evenly to the diverter plate (221).

8. A DC-type dual-point needle valve hot runner device according to claim 1, characterized in that: The nozzle (231) is equipped with a sprue seat (232) and a sprue sleeve (233) at its end. The sprue seat (232) is fixedly connected to the nozzle (231). The sprue sleeve (233) is detachably installed on the sprue seat (232) and is set in a one-to-one correspondence with the needle valve (3).

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