Hot runner system for injection molding

Abstract

The invention discloses a hot runner system for injection molding, and relates to the technical field of injection molding. A hot runner system for injection molding comprises a splitter plate, the splitter plate comprises an internal injection channel and a transfer hole communicated with the injection channel, and the splitter plate is provided with a first glue injection nozzle used for being connected with a vertical injection molding machine and a second glue injection nozzle used for being connected with a horizontal injection molding machine. The first glue injection nozzle and the second glue injection nozzle are communicated with the material injection channel through transfer holes; a plurality of glue discharging devices which are communicated with the material injection channel and are used for discharging glue are mounted on the splitter plate, the glue discharging devices can realize on-off control of glue discharging, and a fluid switching device is mounted in the transfer hole. The use switching of the vertical injection molding machine and the horizontal injection molding machine, double-color injection molding and injection molding of mixed melt can be conveniently completed.

Description

Technical Field

[0001] This application relates to the technical field of injection molding, and in particular to a hot runner system for injection molding. Background Technology

[0002] In the field of plastics processing, injection molding technology is widely used due to its high production efficiency and high product precision. Typically, in order to achieve production automation, multiple pieces of equipment need to work together to efficiently complete the conversion from raw materials to finished products.

[0003] Typically, injection molding production requires the use of injection molding machines, molds, and other auxiliary equipment such as hot runner systems. During production, the injection molding machine heats the plastic to melt it and then injects it into the hot runner system through the injection port. The hot runner system then applies high pressure and injects the melt into the mold cavity through its hot nozzles. Finally, the melt in the mold is cooled and the mold is opened to obtain the product. The hot runner system helps to achieve precise injection control of the melt and keep the melt in a molten state.

[0004] Currently, commonly used injection molding machines can generally be divided into vertical injection molding machines and horizontal injection molding machines according to their structure. Vertical injection molding machines have a smaller footprint and are suitable for insert molding, while horizontal injection molding machines have better stability and higher production efficiency, and are widely used in the production of large products. Traditional hot runner systems usually have only one injection port, and one injection port can only be connected to either a vertical or horizontal injection molding machine. Only one type of injection molding machine can be used at a time. When the injection demand changes and the use of vertical or horizontal injection molding machines needs to be switched, not only is it necessary to adjust the position and orientation of the hot runner system, but also to stop the machine and reassemble and debug it, which is time-consuming, labor-intensive, and affects production efficiency. Furthermore, users also want to be able to connect both vertical and horizontal injection molding machines to the hot runner system simultaneously to inject two types of melt into the system at the same time, achieving two-color injection molding by differentiating the two types of melt. They also want to be able to pre-mix the two types of melt within the hot runner system for injection molding of mixed melts. Summary of the Invention

[0005] In order to facilitate the switching between vertical and horizontal injection molding machines, two-color injection molding, and injection molding of mixed melts, this application provides a hot runner system for injection molding.

[0006] This application provides a hot runner system for injection molding, which adopts the following technical solution: A hot runner system for injection molding includes a manifold, which includes an internal injection channel and a transfer hole communicating with the injection channel. The manifold is equipped with a first injection nozzle for connection to a vertical injection molding machine and a second injection nozzle for connection to a horizontal injection molding machine. Both the first and second injection nozzles are connected to the injection channel through the transfer hole. The manifold is also equipped with multiple dispensing devices communicating with the injection channel and used for dispensing glue. These dispensing devices enable on / off control of the glue dispensing process. The device includes multiple dispensing devices, including a first dispensing device and a second dispensing device. A fluid switching device is installed in the transfer hole. The fluid switching device includes a switching plate slidably attached to the transfer hole and a driving component connected to the switching plate. The switching plate has a first position, a second position, a third position, and a fourth position. When the switching plate is in the first position, the first dispensing nozzle is closed, and the second dispensing nozzle is connected to both the first and second dispensing devices. When the switching plate is in the second position, the first dispensing nozzle is connected only to the first dispensing device, and the second dispensing nozzle is connected only to the second dispensing device. When the switching plate is in the third position, the first dispensing nozzle is connected to both the first and second dispensing devices, and the second dispensing nozzle is closed. When the switching plate is in the fourth position, the first dispensing nozzle is connected to both the first and second dispensing devices, and the second dispensing nozzle is also connected to both the first and second dispensing devices.

[0007] By adopting the above technical solution, the following actions can be achieved: connecting the vertical injection molding machine to the first injection nozzle and connecting the horizontal injection molding machine to the second injection nozzle. At this time, the drive component drives the switching plate to move to different positions, thereby realizing the switching between the use of the vertical injection molding machine and the horizontal injection molding machine, two-color injection molding, and injection of mixed melts. Specifically, when the switching plate reaches the first position, only the horizontal injection molding machine simultaneously provides melt to both the first and second dispensing devices, meaning the horizontal injection molding machine is used alone for injection molding. When the switching plate reaches the second position, the vertical injection molding machine provides melt to both the first and second dispensing devices, enabling both vertical and horizontal injection molding machines to simultaneously provide different types of melt, which are then sprayed out separately by the two dispensing devices, thus achieving two-color injection molding. When the switching plate reaches the third position, only the vertical injection molding machine simultaneously provides melt to both the first and second dispensing devices, meaning the vertical injection molding machine is used alone for injection molding. When the switching plate reaches the fourth position, both the vertical and horizontal injection molding machines can simultaneously provide melt, which mixes in the transfer hole and then flows to each dispensing device for injection molding, thus achieving injection molding of mixed melt.

[0008] Preferably, the injection channel includes a first sub-channel and a second sub-channel. The first sub-channel is used to connect the transfer hole and the first dispensing device, and the second sub-channel is used to connect the transfer sub-channel and the second dispensing device. The transfer hole has a first injection port for connecting with the first injection nozzle, a second injection port for connecting with the second injection nozzle, a third injection port for connecting with the first sub-channel, and a fourth injection port for connecting with the second sub-channel. The first, third, fourth, and second injection ports are arranged sequentially from top to bottom. The first position is located between the first and third injection ports, the second position is located between the third and fourth injection ports, the third position is located between the fourth and second injection ports, and the fourth position is located below the second injection port.

[0009] Preferably, the first dispensing device includes a hot nozzle for dispensing adhesive, the hot nozzle being mounted on a distributor plate and communicating with the injection channel; The hot nozzle includes an internal discharge channel. The hot nozzle is equipped with an opening and closing plug and a spring-loaded pressure mechanism connected to the opening and closing plug. The flow divider plate is also equipped with a power component connected to the spring-loaded pressure mechanism. The power component is used to drive the opening and closing plug to rotate through the spring-loaded pressure mechanism, thereby opening and closing the discharge channel.

[0010] By adopting the above technical solution, the elastic force application mechanism can be driven to rotate by the driving power component, thereby realizing the opening and closing of the discharge channel.

[0011] Preferably, the power assembly includes a drive component mounted on the outer wall of the splitter plate, the drive component being connected to a connecting rod, the splitter plate having an installation hole, the connecting rod being fitted through the installation hole, the connecting rod being connected to a spring-loaded pressure mechanism, and the drive component being used to drive the connecting rod to rotate, thereby driving the opening and closing plug to rotate through the spring-loaded pressure mechanism.

[0012] By adopting the above technical solution, the driving component can drive the connecting rod to rotate, thereby driving the opening and closing plug to rotate through the elastic pressure mechanism. The power component set in this structure can ensure that the melt does not overflow.

[0013] Preferably, the elastic pressure mechanism includes a connecting column, a connecting hole at the lower end of the connecting rod, the connecting column being slidably connected to the connecting hole, a compression spring being provided inside the connecting hole, the compression spring being in a compressed state, the upper end of the compression spring being connected to the connecting hole, the lower end of the compression spring being connected to the connecting column, the connecting column being connected to the opening and closing plug, the opening and closing plug being eccentrically positioned relative to the connecting rod; the discharge channel includes a reduced diameter section, the reduced diameter section having a reduced diameter hole and a stepped end face located above the reduced diameter hole, the reduced diameter hole including a first inclined surface, the opening and closing plug including a second inclined surface on its outer wall, the second inclined surface being able to abut against the first inclined surface to close the reduced diameter hole; The opening and closing plug has an open position and a closed position; when the opening and closing plug is in the open position, the first inclined surface is away from the second inclined surface, the opening and closing plug is located on the end face of the step, and the discharge channel is open; when the opening and closing plug is in the closed position, the first inclined surface is in contact with the second inclined surface, and the opening and closing plug closes the discharge channel.

[0014] By adopting the above technical solution, when the connecting rod rotates, it will drive the connecting column to rotate, thereby causing the opening and closing plug to rotate eccentrically. The opening and closing plug can switch between the open position and the closed position. The setting of the pressure spring provides the opening and closing plug with space for displacement along the axis of the connecting column and also provides the opening and closing plug with a force to press against the reduced diameter part. When the opening and closing plug is in the open position, the pressure spring can make the opening and closing plug reliably close the reduced diameter hole. When the opening and closing plug is in the closed position, the pressure spring will make the opening and closing plug press against the end face of the step to prevent the opening and closing plug from moving accidentally.

[0015] Preferably, the reduced diameter section divides the space in the discharge channel into a first cavity and a second cavity from top to bottom; the opening and closing plug has a first reflux hole communicating with the second cavity, the connecting column has a second reflux hole communicating with the first reflux hole, and the connecting rod has a third reflux hole communicating with the first cavity; When the plug is in the open or closed position, the second and third return orifices are not connected; when the plug is in a position between the open and closed positions, the second and third return orifices are connected.

[0016] By adopting the above technical solution, when the injection is to stop, i.e., when the plug moves from the open position to the closed position, the plug usually closes quickly to ensure reliable injection stopping. The melt remaining in the second cavity may be squeezed by the plug closing the narrowed orifice. The melt remaining in the second cavity may be squeezed and excessively sheared, causing the material to melt. In this application, when the plug is in the position between the open and closed positions, the melt can flow in the first return orifice, the second return orifice, and the third return orifice. If the plug moves from the open position to the closed position, the melt in the second cavity will reach the first cavity through the first return orifice, the second return orifice, and the third return orifice, i.e., the melt can flow back. This structure can prevent excessive squeezing of the melt when the plug closes.

[0017] Preferably, the connecting hole is rotatably connected to a drain rod, and the end of the connecting post near the compression spring has a receiving hole that extends through to the second return hole. The drain rod passes through the receiving hole and slides against the receiving hole. The drain rod is also inserted into the first return hole and the second return hole.

[0018] By adopting the above technical solution, when the connecting rod drives the opening and closing plug to rotate, the opening and closing plug and the connecting column will move synchronously along the axis of the connecting rod. At this time, the first return hole and the second return hole will be displaced relative to the unblocking rod, that is, the unblocking rod can unblock the first return hole and the second return hole.

[0019] Preferably, the outer wall of the unblocking rod has a clearing blade.

[0020] By adopting the above technical solution, when the connecting column moves along the connecting axis, the unblocking blade can cut up foreign objects that may be blocked in the first and second return holes.

[0021] Preferably, the distributor plate has a mounting groove, and a heating tube for heating the distributor plate is installed in the mounting groove.

[0022] By adopting the above technical solution, the heating tube can heat the flow divider plate to ensure that the melt is in a flowable state.

[0023] Preferably, the diverter plate includes a cleaning port communicating with the transfer hole, and the cleaning port is threadedly connected to a plug.

[0024] By adopting the above technical solution, the plug head can be disassembled for cleaning of the transfer hole.

[0025] In summary, the present invention has at least one of the following beneficial technical effects: 1. This application can achieve the following actions: connecting a vertical injection molding machine to the first injection nozzle and a horizontal injection molding machine to the second injection nozzle. At this time, the drive component drives the switching plate to move to different positions, thereby realizing the switching between the use of the vertical injection molding machine and the horizontal injection molding machine, two-color injection molding, and injection molding of mixed melts. Specifically, when the switching plate reaches the first position, only the horizontal injection molding machine simultaneously provides melt to both the first and second dispensing devices, meaning the horizontal injection molding machine is used alone for injection molding; when the switching plate reaches the second position, the vertical injection molding machine provides melt solely to the first dispensing device, and the horizontal injection molding machine provides melt solely to the second dispensing device. Both the vertical and horizontal injection molding machines can simultaneously provide different types of melt, which are then ejected separately by the two dispensing devices, thus achieving two-color injection molding; when the switching plate reaches the third position, only the vertical injection molding machine simultaneously provides melt to both the first and second dispensing devices, meaning the vertical injection molding machine is used alone for injection molding; when the switching plate reaches the fourth position, both the vertical and horizontal injection molding machines can simultaneously provide melt, which is mixed in the transfer hole and subsequently flows to each dispensing device for injection molding, thus achieving injection molding of mixed melts. 2. When the injection is about to stop, i.e., when the plug moves from the open position to the closed position, the plug usually closes quickly to ensure reliable injection stopping. The melt remaining in the second cavity may be squeezed by the plug closing the narrowed orifice. The melt remaining in the second cavity may be squeezed and excessively sheared, causing the material to melt. In this application, when the plug is in the position between the open and closed positions, the melt can flow in the first return orifice, the second return orifice, and the third return orifice. If the plug moves from the open position to the closed position, the melt in the second cavity will flow back to the first cavity through the first return orifice, the second return orifice, and the third return orifice. This structure can prevent excessive squeezing of the melt when the plug closes. 3. When the connecting rod drives the opening and closing plug to rotate, the opening and closing plug and the connecting column will move synchronously along the axis of the connecting rod. At this time, the first return hole and the second return hole will be displaced relative to the unblocking rod, that is, the unblocking rod can unblock the first return hole and the second return hole. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a hot runner system for injection molding according to an embodiment of this application; Figure 2 This is a top view of a hot runner system for injection molding; Figure 3 This is a cross-sectional view used to show the second injection port; Figure 4 It is a cross-sectional view used to show the positions of the first, third, and fourth injection ports; Figure 5 This is a cross-sectional view used to illustrate the hot nozzle; Figure 6 This is a cross-sectional view used to illustrate the first dispensing device; Figure 7 yes Figure 6 Enlarged view of section A.

[0027] The attached diagram shows the following markings: 1. Diverter plate; 11. Injection channel; 111. Sub-channel one; 112. Sub-channel two; 12. Transfer hole; 121. First injection port; 122. Second injection port; 123. Third injection port; 124. Fourth injection port; 13. First injection nozzle; 14. Second injection nozzle; 15. Mounting groove; 151. Heating tube; 16. Cleaning port; 161. Sealing head; 2. First dispensing device; 21. Heating nozzle; 22. Dispensing channel; 221. Diameter reduction section; 2211. Diameter reduction hole; 22111. First inclined surface; 2212. Stepped end face; 222. First cavity; 223. 23. Two chambers; 231. Opening and closing plug; 232. Second inclined surface; 233. First reflux hole; 24. Elastic pressure mechanism; 241. Connecting column; 2411. Second reflux hole; 242. Connecting hole; 243. Pressure spring; 25. Power assembly; 251. Drive component; 252. Connecting rod; 2521. Third reflux hole; 253. Mounting hole; 3. Second dispensing device; 4. Fluid switching device; 41. Switching plate; 411. First position; 412. Second position; 413. Third position; 414. Fourth position; 42. Driving component; 5. Unblocking rod; 51. Receiving hole; 52. Unblocking blade. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] This application discloses a hot runner system for injection molding. It is designed to perform the following functions and allows for rapid function switching: standalone use of a vertical injection molding machine, standalone use of a horizontal injection molding machine, simultaneous use of a vertical and horizontal injection molding machine to perform two-color injection molding, and simultaneous use of a vertical and horizontal injection molding machine to perform injection molding of a mixed melt.

[0031] Reference Figure 1 , Figure 2 and Figure 3A hot runner system for injection molding includes a manifold 1. The manifold 1 includes an internal injection channel 11 and a transfer hole 12 communicating with the injection channel 11. A first injection nozzle 13 for connection to a vertical injection molding machine and a second injection nozzle 14 for connection to a horizontal injection molding machine are detachably mounted on the manifold 1 by bolts. Since the injection outlet of a vertical injection molding machine is usually vertically arranged and the injection outlet of a horizontal injection molding machine is horizontally arranged, in this application, the first injection nozzle 13 is arranged vertically to facilitate connection with the vertical injection molding machine, and the second injection nozzle 14 is arranged horizontally to facilitate connection with the horizontal injection molding machine. Both the first injection nozzle 13 and the second injection nozzle 14 are connected to the injection channel 11 through the transfer hole 12. The manifold 1 is equipped with a plurality of dispensing devices that communicate with the injection channel 11 and are used for dispensing glue. The dispensing devices can realize the on / off control of glue dispensing.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The multiple dispensing devices include a first dispensing device 2 on one side of the transfer hole 12 and a second dispensing device 3 on the other side of the transfer hole 12. Specifically, there are three first dispensing devices 2 and two second dispensing devices 3. The injection channel 11 includes a sub-channel 111 and a sub-channel 212. Sub-channel 111 and sub-channel 212 are located on both sides of the transfer hole 12. Sub-channel 111 is used to connect the transfer hole 12 and the three first dispensing devices 2, and sub-channel 212 is used to connect the transfer hole 12 and the two second dispensing devices 3.

[0033] Reference Figure 3 and Figure 4 The transfer hole 12 has a first injection port 121 for communicating with the first injection nozzle 13, a second injection port 122 for communicating with the second injection nozzle 14, a third injection port 123 for communicating with the sub-material channel 111, and a fourth injection port 124 for communicating with the sub-material channel 212.

[0034] Reference Figure 3 and Figure 4In order to enable the switching of various functions, this application has designed the positions of the first injection port 121, the second injection port 122, the third injection port 123, and the fourth injection port 124, and a fluid switching device 4 is installed in the transfer hole 12. Specifically, the fluid switching device 4 includes a switching plate 41 that is slidably attached to the transfer hole 12 and a driving member 42 connected to the switching plate 41. The driving member 42 is a hydraulic cylinder, which can drive the switching plate 41 to move up and down. The switching plate 41 has a first position 411, a second position 412, a third position 413, and a fourth position 414 distributed from high to low. The first injection port 121, the third injection port 123, the fourth injection port 124, and the second injection port 122 are also arranged from top to bottom. The first position 411 is located between the first injection port 121 and the third injection port 123, the second position 412 is located between the third injection port 123 and the fourth injection port 124, the third position 413 is located between the fourth injection port 124 and the second injection port 122, and the fourth position 414 is located below the second injection port 122.

[0035] When the switching plate 41 is in the first position 411, the first injection nozzle 13 is closed, and the second injection nozzle 14 is connected to both the first dispensing device 2 and the second dispensing device 3. The horizontal injection molding machine provides melt to both the first dispensing device 2 and the second dispensing device 3 at the same time, that is, the horizontal injection molding machine is used alone for injection molding.

[0036] When the switching plate 41 is in the second position 412, the first injection nozzle 13 is only connected to the first dispensing device 2, and the second injection nozzle 14 is only connected to the second dispensing device 3. The vertical injection molding machine provides melt to the first dispensing device 2 alone, thereby providing melt to the three first dispensing devices 2. The horizontal injection molding machine provides melt to the second dispensing device 3 alone, thereby providing melt to the two second dispensing devices 3. At this time, if the vertical injection molding machine and the horizontal injection molding machine simultaneously provide different types of melt and spray them out separately by the three first dispensing devices 2 and the two second dispensing devices 3, two-color injection molding can be achieved.

[0037] When the switching plate 41 is in the third position 413, the first injection nozzle 13 is connected to both the first dispensing device 2 and the second dispensing device 3, and the second injection nozzle 14 is closed. The vertical injection molding machine simultaneously provides melt to the first dispensing device 2 and the second dispensing device 3, that is, the vertical injection molding machine is used alone for injection molding.

[0038] When the switching plate 41 is in the fourth position 414, the first injection nozzle 13 is connected to both the first dispensing device 2 and the second dispensing device 3, and the second injection nozzle 14 is also connected to both the first dispensing device 2 and the second dispensing device 3. The vertical injection molding machine and the horizontal injection molding machine can simultaneously provide melt, and the melt is mixed in the transfer hole 12 and then transferred to each dispensing device for injection molding, thus realizing the injection molding of the mixed melt.

[0039] It's important to note that the difference between two-color injection molding and mixed melt injection molding lies in their flow paths. In two-color injection molding, after the melt enters the mold cavity, the two types of melt have relatively independent flow paths, ultimately forming a well-defined composite structure. The two melts do not fully mix during the molding process. In contrast, in mixed melt injection molding, the two types of melt are fully mixed before entering the mold cavity, resulting in a product with no clear material boundary and exhibiting the combined properties of both materials. Applications of two-color injection molding include keycaps and skirts for two-color buttons, and the rigid frame and soft covering layer of car door handles. Applications of mixed melt injection molding include impact-resistant and easily moldable laptop casings, and acid and alkali resistant delivery pipes that combine flexibility and chemical corrosion resistance.

[0040] Reference Figure 2 , Figure 3 and Figure 4 To ensure the flowability of the melt within the injection channel 11, the manifold 1 has multiple mounting slots 15, each of which is fitted with a heating tube 151 for heating the manifold 1. To facilitate cleaning of the transfer hole 12, the manifold 1 includes a cleaning port 16 connected to the transfer hole 12. The cleaning port 16 is threadedly connected to a sealing head 161, and a drive unit 42 is mounted on the sealing head 161.

[0041] Reference Figure 5 , Figure 6 and Figure 7 Taking the structure of one of the first dispensing devices 2 as an example: the first dispensing device 2 includes a hot nozzle 21 for dispensing glue. The hot nozzle 21 is installed on the diverter plate 1 and communicates with the injection channel 11. The hot nozzle 21 includes an internal dispensing channel 22. The hot nozzle 21 is provided with an opening and closing plug 23 and an elastic pressure mechanism 24 connected to the opening and closing plug 23. The diverter plate 1 is also equipped with a power component 25 connected to the elastic pressure mechanism 24. The power component 25 is used to drive the opening and closing plug 23 to rotate through the elastic pressure mechanism 24, thereby opening and closing the dispensing channel 22.

[0042] Reference Figure 6 and Figure 7 The power assembly 25 includes a drive component 251 mounted on the outer wall of the splitter plate 1. The drive component 251 may be a swing cylinder or a rotary cylinder. The drive component 251 is connected to a connecting rod 252, which is vertically arranged. The splitter plate 1 has a mounting hole 253, and the connecting rod 252 fits into the mounting hole 253. The connecting rod 252 is connected to the elastic pressure mechanism 24. The drive component 251 is used to drive the connecting rod 252 to rotate, thereby driving the opening and closing plug 23 to rotate through the elastic pressure mechanism.

[0043] Reference Figure 6 and Figure 7The elastic pressure mechanism 24 includes a connecting column 241 and a connecting rod 252 with a connecting hole 242 at its lower end. The connecting column 241 is slidably connected to the connecting hole 242. A pressure spring 243 is provided above the connecting column 241 in the connecting hole 242. The pressure spring 243 is in a compressed state. The upper end of the pressure spring 243 is connected to the bottom end of the connecting hole 242, and the lower end of the pressure spring 243 is connected to the connecting column 241. The connecting column 241 is connected to the opening and closing plug 23. The opening and closing plug 23 is eccentrically set to the connecting rod 252. The connecting rod 252 can drive the opening and closing plug 23 to rotate eccentrically.

[0044] Reference Figure 7 The discharge channel 22 includes a reduced diameter section 221, which has a reduced diameter hole 2211 and a stepped end face 2212 located above the reduced diameter hole 2211. The reduced diameter hole 2211 is eccentrically disposed to the connecting rod 252. The reduced diameter hole 2211 includes a first inclined surface 22111, which slopes downward from the outside to the inside. The opening and closing plug 23 includes a second inclined surface 231 on the outer wall, which can abut against the first inclined surface 22111 to close the reduced diameter hole 2211.

[0045] The opening and closing plug 23 has an open position and a closed position. When the opening and closing plug 23 is in the open position, the first inclined surface 22111 is separated from the second inclined surface 231, the opening and closing plug 23 is located on the stepped end face 2212, the reduced diameter hole 2211 is not closed, and the discharge channel 22 is open. When the opening and closing plug 23 is in the closed position, the first inclined surface 22111 is in contact with the second inclined surface 231, the reduced diameter hole 2211 is closed, and the opening and closing plug 23 closes the discharge channel 22.

[0046] The pressure spring 243 provides space for the opening and closing plug 23 to move along the axis of the connecting post 241 and also provides the opening and closing plug 23 with a force to press against the reduced diameter portion 221. When the opening and closing plug 23 is in the open position, the pressure spring 243 enables the opening and closing plug 23 to reliably close the reduced diameter hole 2211. When the opening and closing plug 23 is in the closed position, the pressure spring 243 causes the opening and closing plug 23 to press against the step end face 2212 to prevent the opening and closing plug 23 from moving accidentally.

[0047] In the application, when the melt in the hot nozzle 21 flows continuously downward to be injected into the mold, the opening and closing plug 23 can quickly and reliably close the narrowing hole 2211. This is because when the opening and closing plug 23 rotates from the open position to the open position, the melt above the opening and closing plug 23 will push the opening and closing plug 23, and the opening and closing plug 23 will quickly close the narrowing hole 2211. This can ensure reliable cut-off of the melt in high-speed injection molding scenarios.

[0048] Reference Figure 7When the opening / closing plug 23 quickly closes the narrowing orifice 2211, the opening / closing plug 23 may compress the melt located below it. The polymer chains may break under the force, and the melt may be excessively sheared due to compression, leading to material dissolution. Generally, the faster the opening / closing plug 23 closes, the higher the possibility of material degradation. To minimize the occurrence of the above situations, the narrowing section 221 divides the space within the discharge channel 22 into a first chamber 222 and a second chamber 223 from top to bottom. The opening / closing plug 23 has a first reflux orifice 232 communicating with the second chamber 223, and the connecting post 241 has a second reflux orifice 2411 communicating with the first reflux orifice 232. The first reflux orifice 232 is vertically arranged, and the second reflux orifice 2411 is horizontally arranged. The connecting rod 252 has a third reflux orifice 2521 communicating with the first chamber 222. The third reflux orifice 2521 is horizontally arranged.

[0049] When the opening / closing plug 23 is in the open or closed position, the second return hole 2411 and the third return hole 2521 are not connected; when the opening / closing plug 23 is in a position between the open and closed positions, the first return hole 232, the second return hole 2411 and the third return hole 2521 are connected.

[0050] When the plug 23 is in the position between the open and closed positions, the melt can flow within the first return orifice 232, the second return orifice 2411, and the third return orifice 2521 to minimize the compression of the melt. For example, if the plug 23 moves from the open position to the closed position, even if the gap between the plug 23 and the narrowing orifice 2211 becomes smaller as the plug 23 gradually approaches the closed position, making it difficult for the melt to pass through, the melt located in the second cavity 223 can still flow back into the first cavity 222 through the first return orifice 232, the second return orifice 2411, and the third return orifice 2521. Therefore, the melt located in the second cavity 223 will not be excessively compressed by the plug 23.

[0051] Reference Figure 7 Because the first return hole 232 and the second return hole 2411 have small diameters and are long, they may be blocked by impurities carried by the melt. To prevent blockage, a cleaning rod 5 is connected to the connecting hole 242. The end of the connecting post 241 near the pressure spring 243 has a receiving hole 51 that extends through to the second return hole 2411. The cleaning rod 5 passes through the receiving hole 51 and slides against the receiving hole 51. The cleaning rod 5 is inserted into the first return hole 232 and the second return hole 2411. In addition, the outer wall of the cleaning rod 5 has a cleaning blade 52, which can cut up foreign objects that may block the first return hole 232 and the second return hole 2411.

[0052] When the connecting rod 252 drives the opening and closing plug 23 to rotate, the opening and closing plug 23 and the connecting column 241 will move synchronously along the axis of the connecting rod 252. At this time, the first return hole 232 and the second return hole 2411 will be displaced relative to the unblocking rod 5, that is, the unblocking rod 5 and the unblocking blade 52 can unblock the first return hole 232 and the second return hole 2411.

[0053] The implementation principle of a hot runner system for injection molding in this application embodiment is as follows: The first injection nozzle 13 is connected to a vertical injection molding machine, and the second injection nozzle 14 is connected to a horizontal injection molding machine. The function is switched by driving the switching plate 41 to different positions based on the drive component 42. When the switching plate 41 is in the first position 411, the first injection nozzle 13 is closed, and the second injection nozzle 14 is connected to both the first dispensing device 2 and the second dispensing device 3. The horizontal injection molding machine simultaneously provides melt to the first dispensing device 2 and the second dispensing device 3. The horizontal injection molding machine can be used alone for injection molding. When the switching plate 41 is in the second position 412, the first injection nozzle 13 is only connected to the first dispensing device 2, and the second injection nozzle 14 is only connected to the second dispensing device 3. The vertical injection molding machine provides melt to the first dispensing device 2 alone, thereby providing melt to the three first dispensing devices 2. The horizontal injection molding machine provides melt to the second dispensing device 3 alone, thereby providing a second type of melt to the two second dispensing devices 3 to achieve two-color injection molding. When the switching plate 41 is in the third position 413, the first injection nozzle 13 is connected to both the first dispensing device 2 and the second dispensing device 3, and the second injection nozzle 14 is closed. The vertical injection molding machine simultaneously provides melt to the first dispensing device 2 and the second dispensing device 3. The vertical injection molding machine can be used alone for injection molding. When the switching plate 41 is in the fourth position 414, the first injection nozzle 13 is connected to both the first dispensing device 2 and the second dispensing device 3, and the second injection nozzle 14 is also connected to both the first dispensing device 2 and the second dispensing device 3. The vertical injection molding machine and the horizontal injection molding machine can simultaneously provide melt, and the melt is mixed in the transfer hole 12 and then transferred to each dispensing device for injection molding, thus realizing the injection molding of the mixed melt.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hot runner system for injection molding, characterized in that: The system includes a flow divider (1), which includes an internal injection channel (11) and a transfer hole (12) communicating with the injection channel (11). The flow divider (1) is equipped with a first injection nozzle (13) for connecting to a vertical injection molding machine and a second injection nozzle (14) for connecting to a horizontal injection molding machine. Both the first injection nozzle (13) and the second injection nozzle (14) are connected to the injection channel (11) through the transfer hole (12). The flow divider (1) is equipped with a plurality of dispensing devices that communicate with the injection channel (11) and are used for dispensing glue. The dispensing devices can realize the on / off control of glue dispensing. The multiple dispensing devices include a first dispensing device (2) and a second dispensing device (3). A fluid switching device (4) is installed in the transfer hole (12). The fluid switching device (4) includes a switching plate (41) that is slidably attached to the transfer hole (12) and a driving member (42) connected to the switching plate (41). The switching plate (41) has a first position (411), a second position (412), a third position (413), and a fourth position (414). When the switching plate (41) is in the first position (411), the first dispensing nozzle (13) is closed, and the second dispensing nozzle (14) is connected to both the first dispensing device (2) and the second dispensing device (3). When the switching plate (41) is in the second position (412), the first glue nozzle (13) is connected only to the first glue dispensing device (2), and the second glue nozzle (14) is connected only to the second glue dispensing device (3); when the switching plate (41) is in the third position (413), the first glue nozzle (13) is connected to both the first glue dispensing device (2) and the second glue dispensing device (3), and the second glue nozzle (14) is closed; when the switching plate (41) is in the fourth position (414), the first glue nozzle (13) is connected to both the first glue dispensing device (2) and the second glue dispensing device (3), and the second glue nozzle (14) is also connected to both the first glue dispensing device (2) and the second glue dispensing device (3).

2. A hot runner system for injection molding according to claim 1, characterized in that: The injection channel (11) includes a first sub-channel (111) and a second sub-channel (112). The first sub-channel (111) is used to connect the transfer hole (12) and the first dispensing device (2). The second sub-channel (112) is used to connect the transfer hole (12) and the second dispensing device (3). The transfer hole (12) has a first injection port (121) for connecting with the first injection nozzle (13), a second injection port (122) for connecting with the second injection nozzle (14), a third injection port (123) for connecting with the first sub-channel (111), and a third injection port (112) for connecting with the second sub-channel (111). 2) A connected fourth glue inlet (124), wherein the first glue inlet (121), the third glue inlet (123), the fourth glue inlet (124) and the second glue inlet (122) are arranged from top to bottom, the first position (411) is located between the first glue inlet (121) and the third glue inlet (123), the second position (412) is located between the third glue inlet (123) and the fourth glue inlet (124), the third position (413) is located between the fourth glue inlet (124) and the second glue inlet (122), and the fourth position (414) is located below the second glue inlet (122).

3. A hot runner system for injection molding according to claim 1, characterized in that: The first dispensing device (2) includes a hot nozzle (21) for dispensing adhesive, the hot nozzle (21) being mounted on the diverter plate (1) and communicating with the injection channel (11); The hot nozzle (21) includes an internal discharge channel (22). The hot nozzle (21) is provided with an opening and closing plug (23) and a spring pressure mechanism (24) connected to the opening and closing plug (23). The diverter plate (1) is also equipped with a power component (25) connected to the spring pressure mechanism (24). The power component (25) is used to drive the opening and closing plug (23) to rotate through the spring pressure mechanism (24) to open and close the discharge channel (22).

4. A hot runner system for injection molding according to claim 3, characterized in that: The power assembly (25) includes a drive component (251) installed on the outer wall of the splitter plate (1). The drive component (251) is connected to a connecting rod (252). The splitter plate (1) has a mounting hole (253). The connecting rod (252) fits through the mounting hole (253). The connecting rod (252) is connected to the elastic pressure mechanism (24). The drive component (251) is used to drive the connecting rod (252) to rotate, thereby driving the opening and closing plug (23) to rotate through the elastic pressure mechanism.

5. A hot runner system for injection molding according to claim 4, characterized in that: The elastic pressure mechanism (24) includes a connecting column (241), and a connecting hole (242) is opened at the lower end of the connecting rod (252). The connecting column (241) is slidably connected to the connecting hole (242). A pressure spring (243) is provided in the connecting hole (242). The pressure spring (243) is in a compressed state. The upper end of the pressure spring (243) is connected to the connecting hole (242), and the lower end of the pressure spring (243) is connected to the connecting column (241). The connecting column (241) is connected to the opening and closing plug (23). Next, the opening and closing plug (23) is eccentrically positioned relative to the connecting rod (252); the discharge channel (22) includes a reduced diameter section (221), the reduced diameter section (221) has a reduced diameter hole (2211) and a stepped end face (2212) located above the reduced diameter hole (2211), the reduced diameter hole (2211) includes a first inclined surface (22111), the opening and closing plug (23) includes a second inclined surface (231) on the outer wall, the second inclined surface (231) can abut against the first inclined surface (22111) to close the reduced diameter hole (2211); The opening and closing plug (23) has an open position and a closed position; when the opening and closing plug (23) is in the open position, the first inclined surface (22111) is separated from the second inclined surface (231), the opening and closing plug (23) is located on the step end face (2212), and the discharge channel (22) is open; when the opening and closing plug (23) is in the closed position, the first inclined surface (22111) is in contact with the second inclined surface (231), and the opening and closing plug (23) closes the discharge channel (22).

6. A hot runner system for injection molding according to claim 5, characterized in that: The reduced diameter section (221) divides the space inside the discharge channel (22) into a first chamber (222) and a second chamber (223) from top to bottom; the opening and closing plug (23) has a first return hole (232) communicating with the second chamber (223), the connecting column (241) has a second return hole (2411) communicating with the first return hole (232), and the connecting rod (252) has a third return hole (2521) communicating with the first chamber (222); When the plug (23) is in the open or closed position, the second return hole (2411) and the third return hole (2521) are not connected; when the plug (23) is in a position between the open and closed positions, the second return hole (2411) and the third return hole (2521) are connected.

7. A hot runner system for injection molding according to claim 6, characterized in that: The connecting hole (242) is rotatably connected to a drain rod (5). The end of the connecting post (241) near the compression spring (243) has a receiving hole (51) that extends through to the second return hole (2411). The drain rod (5) passes through the receiving hole (51) and slides against the receiving hole (51). The drain rod (5) is also inserted into the first return hole (232) and the second return hole (2411).

8. A hot runner system for injection molding according to claim 7, characterized in that: The unblocking rod (5) has a blockage-clearing blade (52) on its outer wall.

9. A hot runner system for injection molding according to any one of claims 1-8, characterized in that: The flow divider (1) has an installation groove (15) and a heating tube (151) for heating the flow divider (1) is installed in the installation groove (15).

10. A hot runner system for injection molding according to any one of claims 1-8, characterized in that: The diverter plate (1) includes a cleaning port (16) communicating with the transfer hole (12), and the cleaning port (16) is threadedly connected to a plug head (161).

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