An injection molding hot runner system for a profiled part and an injection molding mold

Abstract

This utility model relates to the field of injection molds, specifically to a hot runner system and injection mold for injection molding irregular parts. It includes a main nozzle, a hot nozzle, an upper runner plate, and at least two lower runner plates. The upper runner plate has an upper inlet and an upper outlet on its top and bottom surfaces, respectively. The lower runner plates have a lower inlet and a lower outlet on their top and bottom surfaces, respectively. The hot nozzle is connected to the lower outlet. The main nozzle includes a nozzle body and a sprue, with the sprue having a higher hardness than the nozzle body. A flow distribution channel is formed within the upper runner plate, and multiple straight conveying channels are formed within the lower runner plates. Cleaning channels are formed on the sides of both the upper and lower runner plates, respectively, and are connected to the ends of the flow distribution channel and the straight conveying channels. A plugging head is detachably installed within the cleaning channel, allowing for direct cleaning of the interior of the flow distribution channel and the straight conveying channels, as well as at the corners of each channel, preventing material buildup inside the channels.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, specifically to a hot runner system for injection molding irregular parts and an injection mold. Background Technology

[0002] Injection molds are core equipment used in injection molding processes in industrial production. Their function is to melt thermoplastic or thermosetting plastic raw materials at high temperatures and inject them into the mold cavity under high pressure, where they are cooled and solidified to form plastic products of a specific shape.

[0003] As a key tool in injection molding, the design and manufacturing precision of molds directly determine the dimensional stability, surface quality, and production efficiency of products. A mold typically consists of two main parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, while the fixed mold is fixed to the injection end. When the mold closes, it forms a closed cavity; when it opens, the finished product is ejected through the ejection system. The mold's interior contains precision structures such as a gating system, a cooling system, an ejection mechanism, and venting channels. The gating system guides the molten plastic to fill the cavity evenly; the cooling system controls the molding cycle and product shrinkage rate through circulating water channels; the ejection mechanism pushes the solidified product out of the mold core using ejector pins or push plates; and the venting channels prevent surface defects caused by residual gas.

[0004] However, the traditional horizontal and vertical runner system of existing injection molds cannot meet the requirements for injection molding of irregularly shaped parts, resulting in a more complex internal runner orientation. Material is easily trapped in the runner, which makes the product prone to yellowing after molding and affects the product molding effect. Utility Model Content

[0005] The purpose of this utility model is to provide a hot runner system and injection mold for injection molding of irregular parts, which aims to improve the problem that the traditional horizontal and vertical runner system of existing injection molds cannot meet the injection molding of irregular parts, resulting in a more complex internal runner path, easy material accumulation in the runner, and easy yellowing of the product after molding, thus affecting the product molding effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A hot runner system for injection molding irregular parts includes a main nozzle, a hot nozzle, an upper runner plate, and at least two lower runner plates. The upper runner plate has an upper inlet and an upper outlet on its top and bottom surfaces, respectively. The lower runner plates have a lower inlet and a lower outlet on their top and bottom surfaces, respectively. The lower inlet is located at the center of the top surface of the lower runner plate. The upper inlet is connected to one of the lower inlets, and the hot nozzle is connected to the lower outlet.

[0008] The main nozzle includes a nozzle body and a sprue. The top of the nozzle body is provided with a first mounting groove, and the sprue is connected in the first mounting groove. The bottom of the nozzle body is connected to the upper feed port, and the hardness of the sprue is greater than that of the nozzle body.

[0009] The upper flow channel plate has a diversion channel that connects the upper feed port and the lower discharge port; the lower flow channel plate has multiple straight conveying channels, one end of which is connected to the lower feed port and the other end of which is connected to the lower discharge port.

[0010] The upper flow channel plate and the side of the upper flow channel plate are provided with cleaning channels. The cleaning channels are connected to the ends of the diversion channel and the straight conveying channel, respectively. A plugging head is disassembled and installed in the cleaning channel.

[0011] Furthermore, the lower flow channel plate is provided with a weight reduction notch, which is located between adjacent straight conveying channels.

[0012] Furthermore, the upper flow channel plate includes a connecting plate and flow dividers connected to both ends of the connecting plate. The flow dividers include a main straight channel and a secondary straight channel. The main straight channel is located inside the connecting plate, and the secondary straight channels are located inside the flow dividers. The secondary straight channels are symmetrically arranged on both sides of the connecting plate.

[0013] The upper feed inlet is connected to the middle of the main linear channel; both ends of the main linear channel are connected to the middle of the secondary linear channel, and both ends of the secondary linear channel are respectively connected to an upper discharge port.

[0014] Furthermore, the upper flow channel plate has three cleaning channels, which are respectively connected to one end of the main straight channel and one end of the two secondary straight channels.

[0015] Furthermore, the width and length of the upper flow channel plate are both greater than or equal to the width and length of the lower flow channel plate.

[0016] Furthermore, an upper heating ring groove is provided on both the top and bottom surfaces of the diverter plate. The upper heating ring groove is arranged around the periphery of the secondary straight channel. A first bending section is provided on the upper heating ring groove, and the first bending section bends toward the upper feed port.

[0017] An upper heating wire is provided inside the upper heating ring groove.

[0018] Furthermore, a lower heating ring groove is provided on both the top and bottom surfaces of the lower flow channel plate. The lower heating ring groove includes a second bending section and a third bending section connected in sequence. The second bending section is arranged around the periphery of the lower discharge port, and the third bending section is located between adjacent straight conveying channels and extends towards the lower feed port.

[0019] The lower heating ring groove is provided with a lower heating wire.

[0020] Furthermore, the hot nozzle includes a nozzle body, a nozzle head assembly, and a mounting nut;

[0021] The nozzle body is provided with a first discharge channel, and the bottom end of the nozzle body is provided with a second mounting groove, the bottom of the second mounting groove being connected to the first discharge channel;

[0022] The nozzle assembly includes a hot steel body and a beryllium copper cladding, the beryllium copper cladding surrounding the periphery of the hot steel body; a second discharge channel is formed on the hot steel body, the second discharge channel being connected to and concentric with the first discharge channel;

[0023] The mounting nut is detachably connected to the second mounting groove, and the inner ring surface of the mounting nut is in close contact with the outer surface of the beryllium copper cladding.

[0024] Furthermore, it also includes a sealing assembly, which includes a telescopic drive and a valve needle drivably connected to the telescopic drive;

[0025] The lower discharge port is offset from the diversion channel. The upper flow channel plate and the lower flow channel plate are respectively provided with an upper sealing channel and a lower sealing channel. The upper sealing channel, the lower sealing channel and the lower discharge port correspond one-to-one.

[0026] The telescopic drive is positioned above the upper flow channel plate, with its drive end facing downwards and connected to the top of the valve needle. The bottom end of the valve needle passes through the upper sealing channel, the lower sealing channel, and the lower discharge port, extending into the interior of the hot nozzle. The valve needle is concentric with the second discharge flow channel. The telescopic drive drives the valve needle downwards to abut against the bottom opening of the second discharge flow channel or drives the valve needle upwards to separate from the bottom opening of the second discharge flow channel.

[0027] To achieve the above objectives, the present invention adopts the following technical solution:

[0028] An injection mold includes a hot runner system for injection molding of the irregular part, an upper mold unit, and a lower mold unit (not shown in the accompanying drawings); the upper mold unit includes a top plate, a first runner mounting plate, a second runner mounting plate, and an upper mold mounting plate that are detachably connected from top to bottom;

[0029] The first flow channel mounting plate has an installation channel that matches the shape of the upper flow channel plate. The upper flow channel plate is embedded in the installation channel and fixedly connected to the top plate. The second flow channel mounting plate has a third installation groove. The lower flow channel plate is embedded in the third installation groove and fixedly connected to the upper flow channel plate and the second flow channel mounting plate. The side of the upper flow channel plate is spaced apart from the inner side of the installation channel, and the side of the lower flow channel plate is spaced apart from the inner side of the third installation groove.

[0030] An upper template is fixed on the upper mold mounting plate, and the upper template and the lower template of the lower mold unit enclose each other to form a molding cavity; the bottom end of the hot nozzle passes through the second flow channel mounting plate and the upper mold mounting plate and abuts against the glue inlet of the upper template.

[0031] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0032] 1. The multi-layer flow channel plate structure effectively reduces the complexity of the internal flow channels of the plate, making it easy to clean and unclog the internal flow channels of the upper and lower flow channel plates through the upper feed port, upper discharge port, lower feed port, and lower discharge port, preventing material accumulation in the flow channels; at the same time, cleaning channels are set at the ends of the diversion channel and the straight conveying channel, and the corner positions of each flow channel can be cleaned directly through the cleaning channels, further preventing material accumulation in the flow channels and affecting the product forming effect.

[0033] 2. A high-hardness gate is installed to meet the requirements of the gate and the external injection nozzle, thereby improving the service life of the main nozzle. The hardness requirement of the main nozzle body is lower than that of the gate, that is, a split structure main nozzle is adopted to reduce the amount of high-hardness material used and reduce production costs.

[0034] 3. The internal channels of the gating unit have varying apertures. A split structure is designed to facilitate the processing of the apertures inside the gating unit, avoiding tool marks caused by the varying apertures, which could lead to plastic fluid residue inside the gating unit and affect the product molding effect. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the upper runner plate structure of the hot runner system for injection molding of irregular parts according to this utility model;

[0036] Figure 2 This is a schematic diagram of the first structure of the lower runner plate of the hot runner system for injection molding of irregular parts according to this utility model;

[0037] Figure 3 This is a schematic diagram of the second structure of the lower runner plate of the hot runner system for injection molding of irregular parts according to this utility model;

[0038] Figure 4This is a schematic diagram of the hot nozzle cross-sectional structure of the hot runner system for injection molding of irregular parts according to this utility model;

[0039] Figure 5 This is a schematic diagram of the main nozzle cross-sectional structure of the hot runner system for injection molding of irregular parts according to this utility model;

[0040] Figure 6 This is a schematic diagram of the upper mold unit structure of the injection mold described in this utility model;

[0041] Figure 7 This is a schematic diagram of the bottom structure of the upper mold unit of the injection mold described in this utility model;

[0042] Figure 8 This is a schematic diagram of the internal structure of the injection mold described in this utility model;

[0043] Figure 9 This is a schematic diagram of the assembly of the first runner mounting plate of the injection mold described in this utility model;

[0044] Figure 10 This is a schematic diagram of the assembly of the second runner mounting plate of the injection mold described in this utility model;

[0045] Figure 11 This is a schematic diagram of the lower runner plate and hot nozzle assembly of the injection mold described in this utility model;

[0046] Figure 12 This is a schematic diagram of the first runner mounting plate structure of the injection mold described in this utility model;

[0047] Figure 13 This is a schematic diagram of the second runner mounting plate structure of the injection mold described in this utility model.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Upper flow channel plate; 11. Connecting plate; 111. Upper feed inlet; 12. Diverter plate; 121. Upper discharge outlet; 122. Upper heating ring groove; 1221. First bending section; 123. Upper heating wire; 13. Diverter channel; 131. Main straight channel; 132. Secondary straight channel; 14. Cleaning channel; 141. Plug head; 15. Upper sealing channel;

[0050] 2. Lower flow channel plate; 21. Lower feed inlet; 22. Lower discharge outlet; 23. Straight conveying channel; 24. Weight reduction notch; 25. Lower heating ring groove; 251. Second bending section; 252. Third bending section; 26. Lower heating wire; 27. Lower sealing channel;

[0051] 3. Main nozzle; 31. Nozzle body; 311. First mounting groove; 32. Sprue;

[0052] 4. Hot nozzle; 41. Nozzle body; 411. First discharge channel; 412. Second mounting groove; 42. Nozzle head assembly; 421. Hot steel body; 4211. Second discharge channel; 4212. First eaves; 422. Beryllium copper cladding; 4221. Second eaves; 43. Mounting nut;

[0053] 5. Sealing assembly; 51. Telescopic drive component; 52. Valve needle;

[0054] 6. Upper mold unit; 61. Top plate; 62. First flow channel mounting plate; 621. Mounting channel; 622. Wiring channel; 623. Wiring groove; 624. Wire pressing groove; 625. Wire pressing plate; 626. Glue overflow groove; 63. Second flow channel mounting plate; 631. Inside the third mounting groove; 64. Upper mold mounting plate; 641. Upper template; 65. Upper pad; 66. Middle pad; 67. Lower pad; 68. Flow guide block; 681. Flow guide channel. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0056] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0058] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] Example

[0060] Please refer to Figure 1-13 As shown, this embodiment provides a hot runner system for injection molding of irregular parts, including a main nozzle 3, a hot nozzle 4, an upper runner plate 1, and at least two lower runner plates 2. The upper runner plate 1 has an upper feed port 111 and an upper discharge port 121 on its top and bottom surfaces, respectively. The lower runner plates 2 have a lower feed port 21 and a lower discharge port 22 on their top and bottom surfaces, respectively. The lower feed port 21 is located at the center of the top surface of the lower runner plate 2. The upper feed port 111 is connected to the lower feed port 21, and the hot nozzle 4 is connected to the lower discharge port 22.

[0061] Please refer to Figure 5 As shown, the main nozzle 3 includes a nozzle body 31 and a sprue 32. The top of the nozzle body 31 is provided with a first mounting groove 311, and the sprue 32 is connected in the first mounting groove 311. The bottom of the nozzle body 31 is connected to the upper feed port 111. The hardness of the sprue 32 is greater than that of the nozzle body 31.

[0062] Please refer to Figure 1 As shown, the upper flow channel plate 1 has a diversion channel 13 connected to the upper feed inlet 111 and the lower discharge outlet 22; the lower flow channel plate 2 has multiple straight conveying channels 23, one end of which is connected to the lower feed inlet 21, and the other end of which is connected to the lower discharge outlet 22. Both the upper flow channel plate 1 and its side have cleaning channels 14 connected to the ends of the diversion channel 13 and the straight conveying channels 23, respectively. A plugging head 141 is detachably installed within the cleaning channel 14.

[0063] The multi-layer flow channel plate structure effectively reduces the complexity of the internal flow channels of the plate, making it easy to clean and unclog the flow channels of the upper flow channel plate 1 and the lower flow channel plate 2 through the upper feed port 111, upper discharge port 121, lower feed port 21 and lower discharge port 22, preventing material from accumulating in the flow channels. At the same time, cleaning channels 14 are set at the ends of the diversion channel 13 and the straight conveying channel 23, and the corner positions of each flow channel can be cleaned directly through the cleaning channels 14, further preventing material from accumulating in the flow channels and affecting the product forming effect.

[0064] Furthermore, a high-hardness gate 32 is provided to meet the requirements for the gate 32 to be aligned with the external injection nozzle, thereby improving the service life of the main injection nozzle 3. The hardness requirement of the injection nozzle body 31 is lower than that of the gate 32, that is, the main injection nozzle 3 adopts a split structure, which reduces the amount of high-hardness material used and reduces production costs. At the same time, there is a change in the aperture of the internal channel of the gate 32. The split structure facilitates the processing of the aperture of the gate 32 and avoids the appearance of tool marks due to the change in aperture, which would cause plastic fluid to remain inside the gate 32 and affect the product molding effect.

[0065] Please refer to Figure 1 As shown, in this embodiment, the upper feed port 111 is located at the center of the top surface of the upper flow channel plate 1, and the upper discharge ports 121 are centrally symmetrically distributed with the center of the bottom surface of the upper flow channel plate 1 as the center, so as to ensure that the plastic fluid flows to each upper discharge port 121 through the same path after entering the upper feed port 111, and maintains the plastic fluid delivery efficiency to each lower flow channel plate 2.

[0066] Please refer to Figure 2 and Figure 3 As shown, a weight-reduction notch 24 is provided on the lower runner plate 2, and the weight-reduction notch 24 is located between adjacent straight conveying channels 23. The weight-reduction notch 24 makes the lower runner plate 2 have a flower-like shape, which effectively reduces the weight of the lower runner plate 2 while ensuring the stability of the plastic fluid flow in the straight conveying channels 23, thereby improving the efficiency of injection molding opening and closing.

[0067] The upper flow channel plate 1 includes a connecting plate 11 and a flow divider plate 12 connected to both ends of the connecting plate 11. The flow divider channel 13 includes a main straight channel 131 and a secondary straight channel 132. The main straight channel 131 is located inside the connecting plate 11, and the secondary straight channel 132 is located inside the flow divider plate 12. The secondary straight channels 132 are symmetrically arranged on both sides of the connecting plate 11. The upper feed port 111 is connected to the middle of the main straight channel 131; both ends of the main straight channel 131 are connected to the middle of the secondary straight channel 132, and both ends of the secondary straight channel 132 are connected to an upper discharge port 121.

[0068] The connecting plate 11 and the two side flow dividers 12 make the upper flow channel plate 1 distributed in an "I" shape, effectively reducing the size of the upper flow channel plate 1 and further improving the efficiency of injection molding opening and closing. Two secondary straight channels 132 are located on both sides of the main straight channel 131 and are symmetrically arranged. This ensures that the plastic fluid flows along the same path to each upper outlet 121 after entering the main straight channel 131 from the upper inlet 111, allowing the plastic fluid to flow evenly to each lower flow divider 12. In this embodiment, there are four lower flow dividers 12 and four upper outlets 121, with each of the four lower outlets 22 connected to the lower inlet 21 of the four lower flow dividers 12. Please refer to... Figure 2 and Figure 3 As shown, the four lower flow channel plates 2 are arranged symmetrically in pairs to reduce the assembly spacing between the four lower flow channel plates 2.

[0069] The upper flow channel plate 1 has three cleaning channels 14, which are respectively connected to one end of the main straight channel 131 and one end of the two secondary straight channels 132. The extension direction of the three cleaning channels 14 is the same as that of the main straight channel 131 and the secondary straight channels 132, so as to directly clean the internal paths of the main straight channel 131 and the secondary straight channels 132, fully cover the corner positions between adjacent channels, and achieve all-round cleaning of the internal flow channels of the upper flow channel plate 1.

[0070] The width and length of the upper flow channel plate 1 are both greater than or equal to the width and length of the lower flow channel plate 2. The top center of the four lower flow channel plates 2 corresponds to the edge of the flow divider plate 12 of the upper flow channel plate 1, thus limiting the length and width of the lower flow channel plates 2 and ensuring that there is no positional interference between them during the assembly of the four lower flow channel plates 2. In this embodiment, the number of straight conveying channels 23 in one lower flow channel plate 2 is six, that is, the number of lower discharge ports 22 is also six. Similarly, more or fewer straight conveying channels and lower discharge ports 22 can be set.

[0071] Please refer to Figure 1 As shown, upper heating ring grooves 122 are provided on both the top and bottom surfaces of the flow divider plate 12. The upper heating ring grooves 122 are arranged around the periphery of the secondary straight channel 132. The upper heating ring grooves 122 have a first bending section 1221, which bends towards the upper feed port 111. An upper heating wire 123 is provided inside the upper heating ring grooves 122. The upper heating wire 123 heats the plastic fluid inside the upper flow channel plate 1 within the upper heating ring grooves 122, maintaining the fluidity of the plastic solution. At the same time, the upper heating ring grooves 122 are arranged around the periphery of the secondary straight channel 132 to maximize the heating of the plastic fluid in this heating channel. Meanwhile, the first bending section 1221, which bends towards the upper feed port 111, heats the plastic fluid in the main straight channel 131. This reduces the material consumption of the upper heating wire 123 and lowers production costs while ensuring good heating effect. In this embodiment, the end of the upper heating ring groove 122 penetrates the side of the diverter plate 12, so that the end of the upper heating wire 123 extends out of the diverter plate 12 and connects with the electrical connection structure, thereby electrically connecting with external power supply and other electrical devices through the electrical connection structure.

[0072] Please refer to Figure 2 and Figure 3As shown, lower heating ring grooves 25 are provided on both the top and bottom surfaces of the lower flow channel plate 2. Each lower heating ring groove 25 includes a second bent section 251 and a third bent section 252 connected in sequence. The second bent section 251 is arranged around the periphery of the lower discharge port 22, and the third bent section 252 is located between adjacent straight conveying channels 23 and extends towards the lower feed port 21. A lower heating wire 26 is provided within the lower heating ring groove 25. The lower heating wire 26 heats the plastic fluid at the lower discharge port 22 within the second bent section 251, and heats the plastic fluid within the straight conveying channel 23 within the third bent section 252, located on the side of the straight conveying channel 23. This design minimizes the amount of lower heating wire 26 used while ensuring the fluidity of the plastic fluid within the lower flow channel plate 2, thus reducing operating costs. In this embodiment, the end of the lower heating ring groove 25 penetrates the side of the lower flow channel plate 2, so that the end of the lower heating wire 26 extends out of the lower flow channel plate 2 and connects with the electrical connection structure, thereby electrically connecting with external power supply and other electrical components through the electrical connection structure.

[0073] Please refer to Figure 4 As shown, the hot nozzle 4 includes a nozzle body 41, a nozzle head assembly 42, and a mounting nut 43. The nozzle body 41 has a first discharge channel 411, and a second mounting groove 412 is formed at the bottom of the nozzle body 41, with the bottom of the second mounting groove 412 communicating with the first discharge channel 411. The nozzle head assembly 42 includes a hot steel body 421 and a beryllium copper cladding body 422, with the beryllium copper cladding body 422 surrounding the periphery of the hot steel body 421. The hot steel body 421 has a second discharge channel 4211, which communicates with and is concentric with the first discharge channel 411. The mounting nut 43 is detachably connected to the second mounting groove 412, with its inner annular surface fitting against the outer surface of the beryllium copper cladding body 422. In this embodiment, the first discharge channel 411 is a straight channel, and the internal diameter of the second discharge channel 4211 decreases sequentially from top to bottom. By placing the second discharge channel 4211 with a variable aperture inside a separate nozzle assembly 42, the processing difficulty of the hot nozzle 4 is effectively reduced, and the second discharge channel 4211 is easier to process. This avoids the appearance of tool marks inside the second processing channel at the aperture change point, which would cause the plastic fluid to get stuck at the tool mark position and affect the molding effect of the product.

[0074] Specifically, the top of the hot steel body 421 is provided with an outwardly extending first eave 4212, and the top of the beryllium copper cladding 422 abuts against the bottom surface of the first eave 4212, providing support for the hot steel body 421 from below. The top of the beryllium copper cladding 422 is provided with an outwardly extending second eave 4221, and the top of the mounting nut 43 abuts against the bottom surface of the second eave 4221, providing support for the beryllium copper cladding from below, thereby achieving the limiting effect of the mounting nut 43 on the nozzle assembly 42.

[0075] Please refer to Figure 8 As shown, the hot runner system for injection molding of irregularly shaped parts further includes a sealing assembly 5, which includes a telescopic drive 51 and a valve needle 52 that is motive-connected to the telescopic drive 51. Please refer to... Figure 1 and Figure 2 As shown, the lower discharge port 22 is offset from the diversion channel 13. The upper flow channel plate 1 and the lower flow channel plate 2 are respectively provided with an upper sealing channel 15 and a lower sealing channel 27, which correspond one-to-one with the lower discharge port 22. The telescopic drive member 51 is located above the upper flow channel plate 1, with the drive end of the telescopic drive member 51 facing downward and connected to the top of the valve needle 52. The bottom end of the valve needle 52 passes through the upper sealing channel 15, the lower sealing channel 27 and the lower discharge port 22, and extends into the interior of the hot nozzle 4. The valve needle 52 is concentric with the second discharge flow channel 4211. The telescopic drive member 51 drives the valve needle 52 downward to abut against the bottom opening of the second discharge flow channel 4211 or drives the valve needle 52 upward to separate from the bottom opening of the second discharge flow channel 4211.

[0076] In this embodiment, the telescopic drive component 51 is a telescopic cylinder. The telescopic cylinder drives the valve needle 52 to move, either closing or opening the hot nozzle 4. During injection molding, the valve needle 52 moves upward, opening the second discharge channel 4211, allowing the plastic fluid to pass through the second discharge channel 4211 and enter the molding cavity inside the mold. After injection molding is completed, the valve needle 52 moves downward, closing the second discharge channel 4211, sealing and pressurizing the molding cavity inside the mold to prevent the plastic fluid from flowing back and affecting the injection molding effect of the product.

[0077] Please refer to the appendix. Figure 6-13 This embodiment also discloses an injection mold, including the above-mentioned hot runner system for injection molding of irregular parts, an upper mold unit 6 and a lower mold unit (not shown in the figure); the upper mold unit 6 includes a top plate 61, a first runner mounting plate 62, a second runner mounting plate 63 and an upper mold mounting plate 64 that are detachably connected from top to bottom.

[0078] The first flow channel mounting plate 62 has an installation channel 621, which matches the shape of the upper flow channel plate 1. The upper flow channel plate 1 is embedded in the installation channel 621 and is fixedly connected to the top plate 61. The second flow channel mounting plate 63 has a third mounting groove, and the lower flow channel plate 2 is embedded in the third mounting groove 631 and is fixedly connected to the upper flow channel plate 1 and the second flow channel mounting plate 63. The side of the upper flow channel plate 1 is spaced apart from the inner side of the installation channel 621, and the side of the lower flow channel plate 2 is spaced apart from the inner side of the third mounting groove.

[0079] An upper template 641 is fixed on the upper mold mounting plate 64. The upper template 641 and the lower template of the lower mold unit enclose each other to form a molding cavity. The bottom end of the hot nozzle 4 passes through the second flow channel mounting plate 63 and the upper mold mounting plate 64 and abuts against the glue inlet of the upper template 641.

[0080] The upper runner plate 1 and the lower runner plate 2 are located in the mounting channel 621 and the third mounting groove 631, respectively, and are spaced apart from the inner sidewalls of the mounting channel 621 and the third mounting groove, respectively. This reduces the contact area between the upper runner plate 1 and the lower runner plate 2 and the mold structure, thereby reducing the heat loss rate of the upper runner plate 1 and the lower runner plate 2 and maximizing the flowability of the plastic fluid in the runner. In this embodiment, the upper runner plate 1 is connected to the top plate 61, the upper runner plate 1 is connected to the lower runner plate 2, and the lower runner plate 2 is connected to the second runner mounting plate 63 by bolts, connected sequentially from top to bottom, effectively ensuring the stability of the upper runner plate 1 and the lower runner plate 2 inside the upper mold unit 6.

[0081] Please refer to Figure 9-11 As shown, an upper pad 65 is provided on the top surface of the upper flow channel plate 1, and the top surface of the upper pad 65 abuts against the bottom surface of the top plate 61. A middle pad 66 is provided on the top surface of the lower flow channel plate 2, and the top surface of the middle pad 66 abuts against the bottom surface of the upper flow channel plate 1. A lower pad 67 is provided at the bottom of the third mounting slot, and the top surface of the lower pad 67 abuts against the bottom surface of the lower flow channel plate 2. Through the upper pad 65, middle pad 66, and lower pad 67, the contact area between the upper flow channel plate 1, the lower flow channel plate 2 and the top plate 61 and the second flow channel mounting plate 63 is reduced, further reducing the heat loss rate of the upper flow channel plate 1 and the lower flow channel plate 2.

[0082] Please refer to Figure 10 As shown, a guide block 68 is provided between the upper runner plate 1 and the lower runner plate 2. The guide block 68 has a guide channel 681, and the two ends of the guide channel 681 are connected to the upper discharge port 121 and the lower inlet port 21, respectively. The guide block 68 guides the plastic fluid flowing out of the upper runner plate 1 through the guide channel 681, ensuring that the plastic fluid can flow stably into the lower runner plate 2, thereby improving injection molding efficiency.

[0083] Please refer to Figure 12As shown, the first flow channel mounting plate 62 has a wiring channel 622 and a wiring groove 623. The wiring channel 622 corresponds to the end position of the lower heating wire 26. The wiring channel 622 allows the end connecting wire of the lower heating wire 26 to pass through into the wiring groove 623, while the wiring groove 623 limits the end connecting wires of the upper heating wire 123 and the lower heating wire 26, ensuring that the wires remain on the predetermined wiring path and preventing the wires from shifting position, which would affect the stability of the electrical connection between the external power supply equipment and electrical components and the upper heating wire 123 and the lower heating wire 26.

[0084] Furthermore, the opening of the wiring trough 623 is provided with a wire pressing groove 624, which extends downward into the interior of the wiring trough 623, and a wire pressing plate 625 is provided therein, extending into the interior of the wiring trough 623. The wire pressing plate 625 presses down and limits the wires within the wiring trough 623, further ensuring that the wires remain on the predetermined wiring path and preventing the wires from shifting position, which would affect the stability of the electrical connection between the external power supply equipment and electrical components and the upper heating wire 123 and the lower heating wire 26.

[0085] Please refer to Figure 12 and Figure 13 As shown, both the first runner mounting plate 62 and the second runner mounting plate 63 have overflow grooves 626 on their top surfaces. The overflow grooves 626 are connected to the mounting channel 621 and the third mounting groove, respectively. When overflow occurs, the plastic fluid flows out from the overflow grooves 626, making it easier for operators to determine whether overflow has occurred and to accurately control the operation and closure of the injection mold.

[0086] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A hot runner system for injection molding irregularly shaped parts, characterized in that, It includes a main nozzle, a hot nozzle, an upper flow channel plate, and at least two lower flow channel plates. The upper flow channel plate has an upper feed port and an upper discharge port on its top and bottom surfaces, respectively. The lower flow channel plates have a lower feed port and a lower discharge port on their top and bottom surfaces, respectively. The lower feed port is located at the center of the top surface of the lower flow channel plate. The upper feed port is connected to one of the lower feed ports. The hot nozzle is connected to the lower discharge port. The main nozzle includes a nozzle body and a sprue. The top of the nozzle body is provided with a first mounting groove, and the sprue is connected in the first mounting groove. The bottom of the nozzle body is connected to the upper feed port, and the hardness of the sprue is greater than that of the nozzle body. The upper flow channel plate has a diversion channel that connects the upper feed port and the lower discharge port; the lower flow channel plate has multiple straight conveying channels, one end of which is connected to the lower feed port and the other end of which is connected to the lower discharge port. The upper flow channel plate and the side of the upper flow channel plate are provided with cleaning channels. The cleaning channels are connected to the ends of the diversion channel and the straight conveying channel, respectively. A plugging head is disassembled and installed in the cleaning channel.

2. The hot runner system for injection molding irregular parts according to claim 1, characterized in that: The lower flow channel plate has a weight reduction notch, which is located between adjacent straight conveying channels.

3. The hot runner system for injection molding irregular parts according to claim 1, characterized in that: The upper flow channel plate includes a connecting plate and a flow divider plate connected to both ends of the connecting plate. The flow divider includes a main straight channel and a secondary straight channel. The main straight channel is opened inside the connecting plate, and the secondary straight channel is opened inside the flow divider plate. The secondary straight channels are symmetrically arranged on both sides of the connecting plate. The upper feed inlet is connected to the middle of the main linear channel; both ends of the main linear channel are connected to the middle of the secondary linear channel, and both ends of the secondary linear channel are respectively connected to an upper discharge port.

4. The hot runner system for injection molding irregular parts according to claim 3, characterized in that: The upper flow channel plate has three cleaning channels, which are respectively connected to one end of the main straight channel and one end of the two secondary straight channels.

5. The hot runner system for injection molding irregular parts according to claim 3, characterized in that: The width and length of the upper flow channel plate are both greater than or equal to the width and length of the lower flow channel plate.

6. The hot runner system for injection molding irregular parts according to claim 3, characterized in that: The top and bottom surfaces of the diversion plate are provided with upper heating ring grooves, which are arranged around the periphery of the secondary straight channel. The upper heating ring grooves are provided with a first bending section, which bends toward the upper feed port. An upper heating wire is provided inside the upper heating ring groove.

7. The hot runner system for injection molding irregular parts according to claim 1, characterized in that: The lower flow channel plate has a lower heating ring groove on both the top and bottom surfaces. The lower heating ring groove includes a second bending section and a third bending section connected in sequence. The second bending section is arranged around the periphery of the lower discharge port, and the third bending section is located between adjacent straight conveying channels and extends towards the lower feed port. The lower heating ring groove is provided with a lower heating wire.

8. The hot runner system for injection molding irregular parts according to claim 1, characterized in that: The hot nozzle includes a nozzle body, a nozzle head assembly, and a mounting nut; The nozzle body is provided with a first discharge channel, and the bottom end of the nozzle body is provided with a second mounting groove, the bottom of the second mounting groove being connected to the first discharge channel; The nozzle assembly includes a hot steel body and a beryllium copper cladding, the beryllium copper cladding surrounding the periphery of the hot steel body; a second discharge channel is formed on the hot steel body, the second discharge channel being connected to and concentric with the first discharge channel; The mounting nut is detachably connected to the second mounting groove, and the inner ring surface of the mounting nut is in close contact with the outer surface of the beryllium copper cladding.

9. The hot runner system for injection molding irregular parts according to claim 8, characterized in that: It also includes a sealing assembly, which includes a telescopic drive and a valve needle drivenly connected to the telescopic drive; The lower discharge port is offset from the diversion channel. The upper flow channel plate and the lower flow channel plate are respectively provided with an upper sealing channel and a lower sealing channel. The upper sealing channel, the lower sealing channel and the lower discharge port correspond one-to-one. The telescopic drive component is positioned above the upper flow channel plate, with its drive end facing downwards and connected to the top of the valve needle; the bottom end of the valve needle passes through the upper sealing channel, the lower sealing channel, and the lower discharge port, and extends into the interior of the hot nozzle. The valve needle is concentric with the second discharge channel. The telescopic drive drives the valve needle downward to abut against the bottom opening of the second discharge channel or drives the valve needle upward to separate from the bottom opening of the second discharge channel.

10. An injection mold, characterized in that, Includes the hot runner system for injection molding of irregular parts as described in any of claims 1-9, an upper mold unit, and a lower mold unit; the upper mold unit includes a top plate, a first runner mounting plate, a second runner mounting plate, and an upper mold mounting plate that are detachably connected from top to bottom; The first flow channel mounting plate has an installation channel that matches the shape of the upper flow channel plate. The upper flow channel plate is embedded in the installation channel and fixedly connected to the top plate. The second flow channel mounting plate has a third installation groove. The lower flow channel plate is embedded in the third installation groove and fixedly connected to the upper flow channel plate and the second flow channel mounting plate. The side of the upper flow channel plate is spaced apart from the inner side of the installation channel, and the side of the lower flow channel plate is spaced apart from the inner side of the third installation groove. An upper template is fixed on the upper mold mounting plate, and the upper template and the lower template of the lower mold unit enclose each other to form a molding cavity; the bottom end of the hot nozzle passes through the second flow channel mounting plate and the upper mold mounting plate and abuts against the glue inlet of the upper template.

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