Hot runner system for injection molding

Abstract

The application discloses a hot runner system for injection molding, and relates to the technical field of injection molding. The hot runner system for injection molding comprises a distribution plate, the distribution plate comprises an internal injection channel and a transfer hole in communication with the injection channel, a first glue injection nozzle for being connected with a vertical injection molding machine and a second glue injection nozzle for being connected with a horizontal injection molding machine are mounted on the distribution plate, and the first glue injection nozzle and the second glue injection nozzle are both in communication with the injection channel through the transfer hole; a plurality of glue outlet devices in communication with the injection channel and used for glue outlet are mounted on the distribution plate, the glue outlet devices can realize on-off control of glue outlet, and the transfer hole is provided with a fluid switching device. The application can facilitate 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.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to a hot runner system for injection molding. BACKGROUND

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

[0003] Typically, injection molding production at least needs to be matched with an injection molding machine, a mold, and a hot runner system and other auxiliary equipment. In production, the injection molding machine heats the plastic to melt it and then injects it into the hot runner system through a glue injection port. Then, the hot runner system applies high pressure to inject the melt into the mold cavity through its hot nozzle. Finally, the product is obtained by cooling the melt in the mold and opening the mold. The hot runner system can assist in achieving precise injection control of the melt and keeping the melt in a molten state.

[0004] The commonly used injection molding machines can be divided into vertical injection molding machines and horizontal injection molding machines according to their structures. The vertical injection molding machine has a small footprint and is suitable for insert molding. The horizontal injection molding machine has good stability and high production efficiency, and is widely used in large product production. The traditional hot runner system usually has only one glue injection port. One glue injection port can only be connected to a vertical injection molding machine or a horizontal injection molding machine. During injection molding, only one type of injection molding machine can be used. When the injection molding demand changes, that is, when the use of the vertical injection molding machine and the horizontal injection molding machine needs to be switched, not only does the position and orientation of the hot runner system need to be adjusted, but also the machine needs to be stopped for reassembly and debugging, which is time-consuming and labor-intensive and affects production efficiency. In addition, users also hope to be able to connect a vertical injection molding machine and a horizontal injection molding machine to the hot runner system at the same time to simultaneously inject two types of melts into the hot runner system to realize the injection of two types of melts and then achieve double-color injection molding. Users also hope to be able to realize the pre-mixing of two types of melts in the hot runner system to achieve the injection of mixed melts. SUMMARY

[0005] In order to facilitate the switching of the use of the vertical injection molding machine and the horizontal injection molding machine, double-color injection molding, and the injection of mixed melts, the present application provides a hot runner system for injection molding.

[0006] The hot runner system for injection molding provided by the present application adopts the following technical scheme:

[0007] The utility model provides a hot runner system for injection molding, comprising a distribution plate, the distribution plate comprises an internal injection channel and a transfer hole in communication with the injection channel, a first glue nozzle for connecting with a vertical injection molding machine and a second glue nozzle for connecting with a horizontal injection molding machine are installed on the distribution plate, and the first glue nozzle and the second glue nozzle are both in communication with the injection channel through the transfer hole; a plurality of glue outlet devices in communication with the injection channel and used for glue outlet are installed on the distribution plate, and the glue outlet devices can realize on-off control of glue outlet;

[0008] Among them, the plurality of glue outlet devices comprises a first glue outlet device and a second glue outlet device, the transfer hole is provided with a fluid switching device, the fluid switching device comprises a switching plate slidingly attached to the transfer hole and a driving member connected with 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 glue nozzle is closed, and the second glue nozzle is in communication with the first glue outlet device and the second glue outlet device; when the switching plate is in the second position, the first glue nozzle is only in communication with the first glue outlet device, and the second glue nozzle is only in communication with the second glue outlet device; when the switching plate is in the third position, the first glue nozzle is in communication with the first glue outlet device and the second glue outlet device, and the second glue nozzle is closed; when the switching plate is in the fourth position, the first glue nozzle is in communication with the first glue outlet device and the second glue outlet device, and the second glue nozzle is also in communication with the first glue outlet device and the second glue outlet device.

[0009] By adopting the above technical scheme, the following actions can be realized: connecting the vertical injection molding machine to the first glue nozzle and connecting the horizontal injection molding machine to the second glue nozzle, at this time, driving the driving member to drive the switching plate to move to different positions can realize the use switching of the vertical injection molding machine and the horizontal injection molding machine, two-color injection molding and injection molding of mixed melt. Specifically, when the switching plate reaches the first position, only the horizontal injection molding machine simultaneously provides melt for the first glue outlet device and the second glue outlet device, that is, the horizontal injection molding machine is used alone for injection molding; when the switching plate reaches the second position, the vertical injection molding machine alone provides melt for the first glue outlet device, and the horizontal injection molding machine alone provides melt for the second glue outlet device, the vertical injection molding machine and the horizontal injection molding machine can simultaneously provide different types of melt and be sprayed by two glue outlet devices, that is, two-color injection molding can be realized; when the switching plate reaches the third position, only the vertical injection molding machine simultaneously provides melt for the first glue outlet device and the second glue outlet device, that is, the vertical injection molding machine is used alone for injection molding; when the switching plate reaches the fourth position, the vertical injection molding machine and the horizontal injection molding machine can simultaneously provide melt, the melt is mixed in the transfer hole and then flows to each glue outlet device for injection molding, that is, injection molding of mixed melt is realized.

[0010] Preferably, the injection channel comprises sub-channel one and sub-channel two, the sub-channel one is used to communicate the transfer hole and the first glue outlet device, the sub-channel two is used to communicate the transfer hole and the second glue outlet device; the transfer hole has a first injection port used to communicate with the first injection nozzle, a second injection port used to communicate with the second injection nozzle, a third injection port used to communicate with the sub-channel one, and a fourth injection port used to communicate with the sub-channel two, wherein the first injection port, the third injection port, the fourth injection port and the second injection port are arranged in sequence from top to bottom, the first position is between the first injection port and the third injection port, the second position is between the third injection port and the fourth injection port, the third position is between the fourth injection port and the second injection port, and the fourth position is below the second injection port.

[0011] Preferably, the first glue outlet device comprises a hot nozzle used for glue outlet, the hot nozzle is installed on the distribution plate and communicates with the injection channel;

[0012] The hot nozzle comprises an internal outlet channel, the hot nozzle is provided with an opening and closing plug and a spring pressing mechanism connected to the opening and closing plug, the distribution plate is further provided with a power assembly connected to the spring pressing mechanism, and the power assembly is used to drive the opening and closing plug to rotate through the spring pressing mechanism to realize the opening and closing of the outlet channel.

[0013] By adopting the above technical scheme, the spring pressing mechanism can be driven to move by driving the power assembly, so as to drive the opening and closing plug to rotate to realize the opening and closing of the outlet channel.

[0014] Preferably, the power assembly comprises a driving part installed on the outer wall of the distribution plate, the driving part is connected with a connecting rod, the distribution plate is provided with a mounting hole, the connecting rod is fitted and arranged in the mounting hole, the connecting rod is connected with the spring pressing mechanism, and the driving part is used to drive the connecting rod to rotate to drive the opening and closing plug to rotate through the spring pressing mechanism.

[0015] By adopting the above technical scheme, the connecting rod can be driven to rotate by driving the driving part, so as to drive the opening and closing plug to rotate through the spring pressing mechanism, and the power assembly arranged in this structure can ensure that the melt does not overflow.

[0016] Preferably, the spring pressing mechanism comprises a connecting column, the lower end of the connecting rod is provided with a connecting hole, the connecting column is slidingly connected to the connecting hole, the connecting hole is provided with a pressing spring, the pressing spring is in a compressed state, the upper end of the pressing spring is connected to the connecting hole, the lower end of the pressing spring is connected to the connecting column, the connecting column is connected with the opening and closing plug, and the opening and closing plug is eccentrically arranged on the connecting rod; the outlet channel comprises a reduced diameter part, the reduced diameter part has a reduced diameter hole and a stepped end face located above the reduced diameter hole, the reduced diameter hole comprises a first inclined surface, the opening and closing plug comprises a second inclined surface on the outer wall, and the second inclined surface can abut against the first inclined surface to close the reduced diameter hole;

[0017] The opening and closing plug has an opening position and a closing position; when the opening and closing plug is in the opening position, the first inclined surface is away from the second inclined surface, the opening and closing plug is on the stepped end surface, and the discharging channel is opened; when the opening and closing plug is in the closing position, the first inclined surface is in contact with the second inclined surface, and the opening and closing plug closes the discharging channel.

[0018] By adopting the technical scheme, when the connecting rod rotates, the connecting rod drives the connecting column to rotate, thereby driving the opening and closing plug to rotate eccentrically, the opening and closing plug can be switched between the opening position and the closing position, the setting of the biasing spring provides space for the opening and closing plug to displace along the axis direction of the connecting column and also provides force for the opening and closing plug to abut against the reduced-diameter portion, when the opening and closing plug is in the opening position, the biasing spring can reliably close the reduced-diameter hole, and when the opening and closing plug is in the closing position, the biasing spring can make the opening and closing plug abut against the stepped end surface to prevent the opening and closing plug from malfunctioning.

[0019] Preferably, the reduced-diameter portion divides the space in the discharging channel into a first cavity and a second cavity from top to bottom; the opening and closing plug is provided with a first backflow hole communicating with the second cavity, the connecting column is provided with a second backflow hole communicating with the first backflow hole, and the connecting rod is provided with a third backflow hole communicating with the first cavity.

[0020] When the opening and closing plug is in the opening position or the closing position, the second backflow hole is not in communication with the third backflow hole; when the opening and closing plug is in a position between the opening position and the closing position, the second backflow hole is in communication with the third backflow hole.

[0021] By adopting the technical scheme, when injection molding is to be stopped, i.e., when the opening and closing plug sub moves from the opening position to the closing position, in order to reliably stop the injection molding, the closing speed of the opening and closing plug is usually fast, and the residual melt in the second cavity can be extruded by the opening and closing plug closing the reduced-diameter hole, and the residual melt in the second cavity can be excessively sheared to cause material dissolution. To this end, in the present application, when the opening and closing plug is in a position between the opening position and the closing position, the melt can flow in the first backflow hole, the second backflow hole and the third backflow hole, and if the opening and closing plug moves from the opening position to the closing position, the melt in the second cavity will reach the first cavity through the first backflow hole, the second backflow hole and the third backflow hole, i.e., the melt can backflow, and this structure can prevent the melt from being excessively extruded when the opening and closing plug is closed.

[0022] Preferably, a dredging rod is rotationally connected to the connecting hole, an accommodation hole penetrating to the second backflow hole is formed in one end of the connecting column close to the biasing spring, the dredging rod is arranged in the accommodation hole, the dredging rod is slidably attached to the accommodation hole, and the dredging rod is also inserted into the first backflow hole and the second backflow hole.

[0023] By adopting the technical scheme, 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 direction of the connecting rod, at this time, the first backflow hole and the second backflow hole will be displaced relative to the dredging rod, that is, the dredging rod can dredge the first backflow hole and the second backflow hole.

[0024] Preferably, the dredging rod has a clearing blade on the outer wall.

[0025] By adopting the technical scheme, when the connecting column moves along the axis direction, the clearing blade can cut the foreign matters that may be blocked in the first backflow hole and the second backflow hole.

[0026] Preferably, the shunt plate is provided with a mounting groove, and a heating pipe for heating the shunt plate is mounted in the mounting groove.

[0027] By adopting the technical scheme, the heating pipe can heat the shunt plate to ensure that the melt is in a flowable state.

[0028] Preferably, the shunt plate comprises a cleaning port communicated with the transfer hole, and a plugging head is threadedly connected to the cleaning port.

[0029] By adopting the technical scheme, the plugging head can be disassembled to clean the transfer hole.

[0030] In summary, the present application has at least one of the following beneficial technical effects:

[0031] 1. The present application can realize the following actions: connecting the vertical injection molding machine to the first glue nozzle and connecting the horizontal injection molding machine to the second glue nozzle, at this time, driving the driving member to drive the switching plate to move to different positions to realize 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. Specifically, when the switching plate reaches the first position, only the horizontal injection molding machine provides melt for the first glue device and the second glue device, that is, the horizontal injection molding machine is used alone for injection molding; when the switching plate reaches the second position, the vertical injection molding machine alone provides melt for the first glue device, and the horizontal injection molding machine alone provides melt for the second glue device, the vertical injection molding machine and the horizontal injection molding machine can simultaneously provide different types of melt and be distinguished by two glue devices, that is, double-color injection molding can be realized; when the switching plate reaches the third position, only the vertical injection molding machine simultaneously provides melt for the first glue device and the second glue device, that is, the vertical injection molding machine is used alone for injection molding; when the switching plate reaches the fourth position, the vertical injection molding machine and the horizontal injection molding machine can simultaneously provide melt, and the melt is mixed in the transfer hole and then flows to each glue device for injection molding, that is, injection molding of mixed melt is realized.

[0032] 2. In order to ensure the injection stop, the opening and closing plug is usually closed at a high speed, and the residual melt in the second cavity can be extruded by the opening and closing plug of the closing diameter hole, and the residual melt in the second cavity can be extruded and sheared to cause material dissolution. In the present application, the melt can flow in the first, second and third backflow holes when the opening and closing plug is located between the opening position and the closing position. If the opening and closing plug moves from the opening position to the closing position, the melt in the second cavity can flow into the first cavity through the first, second and third backflow holes, that is, the melt can backflow, and the structure can prevent the melt from being excessively extruded when the opening and closing plug is closed.

[0033] 3. When the connecting rod drives the opening and closing plug to rotate, the opening and closing plug and the connecting column can move along the axis direction of the connecting rod, and at this time, the first backflow hole and the second backflow hole can be displaced relative to the dredging rod, that is, the dredging rod can dredge the first backflow hole and the second backflow hole. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a hot runner system for injection molding in the embodiment of the present application;

[0035] Figure 2 FIG. 2 is a top view of a hot runner system for injection molding;

[0036] Figure 3 FIG. 3 is a sectional view for embodying a second glue injection port;

[0037] Figure 4 FIG. 4 is a sectional view for embodying the positions of a first glue injection port, a third glue injection port and a fourth glue injection port;

[0038] Figure 5 FIG. 5 is a sectional view for embodying a hot nozzle;

[0039] Figure 6 FIG. 6 is a sectional view for embodying a first glue outlet device;

[0040] Figure 7 FIG. 7 is a sectional view for embodying a second glue outlet device; Figure 6 FIG. 8 is an enlarged view of part A in FIG. 7.

[0041] Marked in the drawing: 1, flow distribution plate; 11, injection channel; 111, sub channel one; 112, sub channel two; 12, transfer hole; 121, first glue injection port; 122, second glue injection port; 123, third glue injection port; 124, fourth glue injection port; 13, first glue injection nozzle; 14, second glue injection nozzle; 15, mounting groove; 151, heating pipe; 16, cleaning port; 161, plugging head; 2, first glue outlet device; 21, hot nozzle; 22, discharge channel; 221, reduced diameter part; 2211, reduced diameter hole; 22111, first inclined surface; 2212, step end surface; 222, first cavity; 223, second cavity; 23, opening and closing plug; 231, second inclined surface; 232, first backflow hole; 24, elastic pressure applying mechanism; 241, connecting column; 2411, second backflow hole; 242, connecting hole; 243, pressure applying spring; 25, power assembly; 251, driving rotating piece; 252, connecting rod; 2521, third backflow hole; 253, mounting hole; 3, second glue outlet device; 4, fluid switching device; 41, switching plate; 411, first position; 412, second position; 413, third position; 414, fourth position; 42, driving piece; 5, dredging rod; 51, accommodating hole; 52, clearing blade. DETAILED DESCRIPTION

[0042] The application will be further described below in conjunction with the drawings.

[0043] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] The embodiment of the present application discloses a hot runner system for injection molding. The hot runner system for injection molding can realize the following functions and can also quickly complete the function switching: single use of a vertical injection molding machine, single use of a horizontal injection molding machine, simultaneous use of the vertical injection molding machine and the horizontal injection molding machine to complete two-color injection molding, and simultaneous use of the vertical injection molding machine and the horizontal injection molding machine to complete injection molding of mixed melt.

[0045] Reference Figure 1 , Figure 2 and Figure 3The hot runner system for injection molding comprises a distribution plate 1, which comprises an internal injection channel 11 and a transfer hole 12 communicating with the injection channel 11, and a first glue injection nozzle 13 and a second glue injection nozzle 14 are detachably installed on the distribution plate 1 by bolts for connecting with vertical injection molding machines and horizontal injection molding machines respectively. In the present application, the first glue injection nozzle 13 is vertically arranged for connecting with the vertical injection molding machines, and the second glue injection nozzle 14 is horizontally arranged for connecting with the horizontal injection molding machines, because the injection outlets of the vertical injection molding machines are usually vertically arranged, and the injection outlets of the horizontal injection molding machines are horizontally arranged. The first glue injection nozzle 13 and the second glue injection nozzle 14 both communicate with the injection channel 11 through the transfer hole 12. A plurality of glue outlet devices for glue outlet are installed on the distribution plate 1 and communicate with the injection channel 11, and the glue outlet devices can realize on-off control of glue outlet.

[0046] Referring to Figure 1 , Figure 2 and Figure 3 , the plurality of glue outlet devices comprise a first glue outlet device 2 on one side of the transfer hole 12 and a second glue outlet device 3 on the other side of the transfer hole 12. Specifically, the first glue outlet device 2 is provided with three, and the second glue outlet device 3 is provided with two. The injection channel 11 comprises a first sub-channel 111 and a second sub-channel 112, which are respectively located on both sides of the transfer hole 12. The first sub-channel 111 is used for communicating the transfer hole 12 with the three first glue outlet devices 2, and the second sub-channel 112 is used for communicating the transfer hole 12 with the two second glue outlet devices 3.

[0047] Referring to Figure 3 and Figure 4 , the transfer hole 12 has a first glue injection port 121 for communicating with the first glue injection nozzle 13, a second glue injection port 122 for communicating with the second glue injection nozzle 14, a third glue injection port 123 for communicating with the first sub-channel 111, and a fourth glue injection port 124 for communicating with the second sub-channel 112.

[0048] Referring to Figure 3 and Figure 4, in order to realize the switching of various functions, the positions of the first glue injection port 121, the second glue injection port 122, the third glue injection port 123 and the fourth glue injection port 124 are designed, and the transfer hole 12 is provided with a fluid switching device 4. Specifically, the fluid switching device 4 comprises a switching plate 41 which is slidably attached to the transfer hole 12, and a driving member 42 connected with the switching plate 41. The driving member 42 is an oil 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 arranged from high to low. The first glue injection port 121, the third glue injection port 123, the fourth glue injection port 124 and the second glue injection port 122 are also arranged from top to bottom in turn. The first position 411 is located between the first glue injection port 121 and the third glue injection port 123, the second position 412 is located between the third glue injection port 123 and the fourth glue injection port 124, the third position 413 is located between the fourth glue injection port 124 and the second glue injection port 122, and the fourth position 414 is located below the second glue injection port 122.

[0049] When the switching plate 41 is in the first position 411, the first glue injection nozzle 13 is closed, and the second glue injection nozzle 14 is in communication with both the first glue outlet device 2 and the second glue outlet device 3, so that the horizontal injection molding machine provides melt for both the first glue outlet device 2 and the second glue outlet device 3, i.e. the horizontal injection molding machine is used alone for injection molding.

[0050] When the switching plate 41 is in the second position 412, the first glue injection nozzle 13 is in communication with only the first glue outlet device 2, and the second glue injection nozzle 14 is in communication with only the second glue outlet device 3. The vertical injection molding machine provides melt for the three first glue outlet devices 2, and the horizontal injection molding machine provides melt for the two second glue outlet devices 3. At this time, if the vertical injection molding machine and the horizontal injection molding machine provide different types of melt at the same time and are distinguished by three first glue outlet devices 2 and two second glue outlet devices 3, i.e. two-color injection molding can be realized.

[0051] When the switching plate 41 is in the third position 413, the first glue injection nozzle 13 is in communication with both the first glue outlet device 2 and the second glue outlet device 3, and the second glue injection nozzle 14 is closed. The vertical injection molding machine provides melt for both the first glue outlet device 2 and the second glue outlet device 3, i.e. the vertical injection molding machine is used alone for injection molding.

[0052] When the switching plate 41 is in the fourth position 414, the first glue injection nozzle 13 is in communication with both the first glue outlet device 2 and the second glue outlet device 3, and the second glue injection nozzle 14 is also in communication with both the first glue outlet device 2 and the second glue outlet device 3. The vertical injection molding machine and the horizontal injection molding machine can provide melt at the same time, and the melt is mixed in the transfer hole 12 and then flows to each glue outlet device for injection molding, i.e. mixed melt injection molding is realized.

[0053] It should be noted that the difference between the double-color injection molding and the mixed melt injection molding is that, for the double-color injection molding process, the two types of melts have relatively independent flow paths in the cavity after the subsequent melt enters the mold cavity, and finally a clear boundary structure is formed, and the two melts do not mix sufficiently during the molding process; for the mixed melt injection molding process, the two types of melts are fully mixed before entering the cavity, and the product has no obvious material boundary, and the product as a whole will exhibit the comprehensive performance of the two materials. The application products of the double-color injection molding are, for example, the key cap and the skirt of the double-color key, and the hard skeleton and the soft coating layer of the automobile door handle; the application products of the mixed melt injection molding are, for example, the notebook computer bottom shell with impact resistance and easy molding, and the acid and alkali resistant conveying pipe with flexibility and chemical corrosion resistance.

[0054] With reference to Figure 2 , Figure 3 and Figure 4 , in order to ensure the flow ability of the melt in the injection channel 11, a plurality of installation grooves 15 are formed on the distribution plate 1, and a heating pipe 151 for heating the distribution plate 1 is installed in each installation groove 15. In order to facilitate cleaning of the transfer hole 12, the distribution plate 1 includes a cleaning port 16 communicating with the transfer hole 12, the cleaning port 16 is threadedly connected with a plug head 161, and the driving member 42 is installed on the plug head 161.

[0055] With reference to Figure 5 , Figure 6 and Figure 7 , taking one of the first glue outlet devices 2 as an example: the first glue outlet device 2 includes a hot nozzle 21 for glue outlet, the hot nozzle 21 is installed on the distribution plate 1 and communicates 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, and the distribution plate 1 is further provided with a power assembly 25 connected to the spring pressure mechanism 24, the power assembly 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.

[0056] With reference to Figure 6 and Figure 7 , the power assembly 25 includes a driving member 251 installed on the outer wall of the distribution plate 1, for example, an oscillating oil cylinder or a rotary oil cylinder, the driving member 251 is connected with a connecting rod 252, the connecting rod 252 is vertically arranged, the distribution plate 1 is provided with an installation hole 253, the connecting rod 252 is fitted and arranged in the installation hole 253, the connecting rod 252 is connected with the spring pressure mechanism 24, and the driving member 251 is used to drive the connecting rod 252 to rotate to drive the opening and closing plug 23 to rotate through the spring pressure mechanism.

[0057] With reference to Figure 6 and Figure 7, the elastic pressure mechanism 24 comprises a connecting column 241, a connecting hole 242 is formed in the lower end of the connecting rod 252, the connecting column 241 is slidingly connected to the connecting hole 242, a pressing spring 243 is arranged above the connecting column 241 in the connecting hole 242, the pressing spring 243 is in a compressed state, the upper end of the pressing spring 243 is connected to the bottom end in the connecting hole 242, and the lower end of the pressing spring 243 is connected to the connecting column 241; the connecting column 241 is connected with the opening and closing plug 23, the opening and closing plug 23 is arranged eccentrically to the connecting rod 252, and the connecting rod 252 can drive the opening and closing plug 23 to rotate eccentrically.

[0058] With reference to Figure 7 , the discharge channel 22 comprises a reduced diameter portion 221, the reduced diameter portion 221 has a reduced diameter hole 2211 and a stepped end face 2212 arranged above the reduced diameter hole 2211, the reduced diameter hole 2211 is arranged eccentrically to the connecting rod 252, and the reduced diameter hole 2211 comprises a first inclined surface 22111 inclined downward from outside to inside; the opening and closing plug 23 comprises a second inclined surface 231 on the outer wall, and the second inclined surface 231 can be in contact with the first inclined surface 22111 to close the reduced diameter hole 2211.

[0059] 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 away 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 opened; 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.

[0060] The arrangement of the pressing spring 243 provides space for the opening and closing plug 23 to displace along the axis of the connecting column 241 and also provides a force for the opening and closing plug 23 to press against the reduced diameter portion 221; when the opening and closing plug 23 is in the open position, the pressing spring 243 can reliably close the reduced diameter hole 2211, and when the opening and closing plug 23 is in the closed position, the pressing spring 243 can make the opening and closing plug 23 abut against the stepped end face 2212 to prevent the opening and closing plug 23 from being misoperated.

[0061] In the application, when the melt in the hot nozzle 21 continuously flows downward to be injected into the mold, the opening and closing plug 23 can quickly and reliably close the reduced diameter hole 2211, because when the opening and closing plug 23 rotates from the open position to the closed position, the melt above the opening and closing plug 23 can push the opening and closing plug 23, and the opening and closing plug 23 can quickly close the reduced diameter hole 2211, which can ensure reliable cutting off of the melt in the high-speed injection scenario.

[0062] With reference to Figure 7When the opening and closing plug 23 quickly closes the reduced-diameter hole 2211, the opening and closing plug 23 can extrude the melt below the opening and closing plug 23, the polymer chain can be broken under the action of force, and the melt can be extruded and excessively sheared to cause material dissolution. Generally, the faster the opening and closing plug 23 closes, the higher the possibility of material degradation. In order to prevent the above situation from occurring as much as possible, the reduced-diameter part 221 divides the space in the discharge channel 22 from top to bottom into a first cavity 222 and a second cavity 223; the opening and closing plug 23 is provided with a first backflow hole 232 communicating with the second cavity 223, the connecting column 241 is provided with a second backflow hole 2411 communicating with the first backflow hole 232, the first backflow hole 232 is vertically arranged, and the second backflow hole 2411 is horizontally and vertically arranged, and the connecting rod 252 is provided with a third backflow hole 2521 communicating with the first cavity 222, and the third backflow hole 2521 is horizontally arranged.

[0063] When the opening and closing plug 23 is in the open position or the closed position, the second backflow hole 2411 and the third backflow hole 2521 are not communicated; when the opening and closing plug 23 is located between the open position and the closed position, the first backflow hole 232, the second backflow hole 2411 and the third backflow hole 2521 are communicated.

[0064] When the opening and closing plug 23 is located between the open position and the closed position, the melt can flow in the first backflow hole 232, the second backflow hole 2411 and the third backflow hole 2521 to prevent the melt from being extruded as much as possible. For example, if the opening and closing plug 23 moves from the open position to the closed position, even if the gap between the opening and closing plug 23 and the reduced-diameter hole 2211 becomes smaller and smaller as the opening and closing plug 23 gradually reaches the closed position, causing the melt to be difficult to pass through, since the melt in the second cavity 223 can reach the first cavity 222 through the first backflow hole 232, the second backflow hole 2411 and the third backflow hole 2521 at this time, that is, the melt can backflow, the melt in the second cavity 223 will not be excessively extruded by the opening and closing plug 23.

[0065] Referring to Figure 7 Since the first backflow hole 232 and the second backflow hole 2411 are small and long in diameter, the first backflow hole 232 and the second backflow hole 2411 can be blocked by impurities carried by the melt. In order to prevent blockage, the connecting hole 242 is connected with a dredging rod 5, the connecting column 241 is provided with a receiving hole 51 penetrating into the second backflow hole 2411 near one end abutting against the elastic spring 243, the dredging rod 5 is arranged in the receiving hole 51, the dredging rod 5 is slidably attached to the receiving hole 51, and the dredging rod 5 is inserted into the first backflow hole 232 and the second backflow hole 2411. In addition, the dredging rod 5 has a blockage removing blade 52 on the outer wall, and the blockage removing blade can cut the foreign matter that may be blocked in the first backflow hole 232 and the second backflow hole 2411.

[0066] 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 direction of the connecting rod 252, at this time, the first backflow hole 232 and the second backflow hole 2411 will be displaced relative to the dredging rod 5, that is, the dredging rod 5 and the unblocking blade 52 can realize dredging of the first backflow hole 232 and the second backflow hole 2411.

[0067] The implementation principle of the hot runner system for injection molding in the embodiment of the application is as follows:

[0068] The first glue injection nozzle 13 is connected to the vertical injection molding machine, and the second glue injection nozzle 14 is connected to the horizontal injection molding machine, and the function switching is realized by driving the driving member 42 to drive the switching plate 41 to move to different positions;

[0069] When the switching plate 41 is in the first position 411, the first glue injection nozzle 13 is closed, the second glue injection nozzle 14 is in communication with the first glue outlet device 2 and the second glue outlet device 3, and only the horizontal injection molding machine provides melt for the first glue outlet device 2 and the second glue outlet device 3, and the horizontal injection molding machine is used alone for injection molding;

[0070] When the switching plate 41 is in the second position 412, the first glue injection nozzle 13 is in communication with only the first glue outlet device 2, and the second glue injection nozzle 14 is in communication with only the second glue outlet device 3, the vertical injection molding machine provides melt for the first glue outlet device 2 alone to provide melt for three first glue outlet devices 2, and the horizontal injection molding machine provides melt for the second glue outlet device 3 alone to provide the second type of melt for two second glue outlet devices 3 to realize two-color injection molding;

[0071] When the switching plate 41 is in the third position 413, the first glue injection nozzle 13 is in communication with the first glue outlet device 2 and the second glue outlet device 3, and the second glue injection nozzle 14 is closed, the vertical injection molding machine provides melt for the first glue outlet device 2 and the second glue outlet device 3 at the same time, and the vertical injection molding machine is used alone for injection molding;

[0072] When the switching plate 41 is in the fourth position 414, the first glue injection nozzle 13 is in communication with the first glue outlet device 2 and the second glue outlet device 3, and the second glue injection nozzle 14 is also in communication with the first glue outlet device 2 and the second glue outlet device 3, the vertical injection molding machine and the horizontal injection molding machine can provide melt at the same time, the melt is mixed in the transfer hole 12, and then flows to each glue outlet device for injection molding, that is, the injection molding of the mixed melt is realized.

[0073] The embodiments of the specific implementation mode are the preferred embodiments of the application, but do not limit the protection scope of the application, so that: any equivalent changes made on the basis of the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A hot runner system for injection molding characterized by: The application relates to a split plate (1) which comprises an internal material injection channel (11) and a transfer hole (12) communicating with the material injection channel (11), a first glue injection nozzle (13) for connecting with a vertical injection molding machine and a second glue injection nozzle (14) for connecting with a horizontal injection molding machine are installed on the split plate (1), the first glue injection nozzle (13) and the second glue injection nozzle (14) both communicate with the material injection channel (11) through the transfer hole (12), a plurality of glue outlet devices for glue outlet are installed on the split plate (1) and communicate with the material injection channel (11), and the glue outlet devices can realize on-off control of glue outlet. The plurality of glue outlet devices comprise a first glue outlet device (2) and a second glue outlet device (3), a fluid switching device (4) is installed on the transfer hole (12), the fluid switching device (4) comprises a switching plate (41) which is slidably attached to the transfer hole (12) and a driving member (42) connected with 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 glue injection nozzle (13) is closed, and the second glue injection nozzle (14) communicates with the first glue outlet device (2) and the second glue outlet device (3), when the switching plate (41) is in the second position (412), the first glue injection nozzle (13) only communicates with the first glue outlet device (2), and the second glue injection nozzle (14) only communicates with the second glue outlet device (3), when the switching plate (41) is in the third position (413), the first glue injection nozzle (13) communicates with the first glue outlet device (2) and the second glue outlet device (3), and the second glue injection nozzle (14) is closed, and when the switching plate (41) is in the fourth position (414), the first glue injection nozzle (13) communicates with the first glue outlet device (2) and the second glue outlet device (3), and the second glue injection nozzle (14) also communicates with the first glue outlet device (2) and the second glue outlet device (3); The first glue outlet device (2) comprises a hot nozzle (21) for glue outlet, the hot nozzle (21) is installed on the split plate (1) and communicates with the material injection channel (11); The hot nozzle (21) comprises an internal material outlet channel (22), an opening and closing plug (23) and an elastic pressure applying mechanism (24) connected with the opening and closing plug (23) are arranged in the hot nozzle (21); A power assembly (25) connected with the elastic pressure applying mechanism (24) is further installed on the split plate (1); The power assembly (25) comprises a driving rotating member (251) installed on the outer wall of the split plate (1), and a connecting rod (252) is connected with the driving rotating member (251). The elastic pressure applying mechanism (24) comprises a connecting column (241), a connecting hole (242) is formed in the lower end of the connecting rod (252), the connecting column (241) is slidingly connected to the connecting hole (242), a pressing spring (243) is arranged in the connecting hole (242), the pressing spring (243) is in a compressed state, the upper end of the pressing spring (243) is connected to the connecting hole (242), the lower end of the pressing spring (243) is connected to the connecting column (241), and the connecting column (241) is connected with the opening and closing plug (23); the discharge channel (22) comprises a reduced diameter portion (221), the reduced diameter portion (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) comprises a first inclined surface (22111), and the opening and closing plug (23) comprises 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).

2. The hot runner system for injection molding according to claim 1, wherein: The injection channel (11) comprises a first sub-channel (111) and a second sub-channel (112), the first sub-channel (111) is used for connecting the transfer hole (12) and the first glue outlet device (2), and the second sub-channel (112) is used for connecting the transfer hole (12) and the second glue outlet device (3); the transfer hole (12) has a first injection port (121) used for communicating with the first injection nozzle (13), a second injection port (122) used for communicating with the second injection nozzle (14), a third injection port (123) used for communicating with the first sub-channel (111), and a fourth injection port (124) used for communicating with the second sub-channel (112), wherein the first injection port (121), the third injection port (123), the fourth injection port (124) and the second injection port (122) are arranged in sequence 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).

3. The hot runner system for injection molding according to claim 1, characterized in that: The power assembly (25) is used for driving the opening and closing plug (23) to rotate through the elastic pressure applying mechanism (24) to open and close the discharge channel (22).

4. The hot runner system for injection molding according to claim 3, wherein: The shunt plate (1) is provided with a mounting hole (253), the connecting rod (252) is arranged in the mounting hole (253) in a fit manner, the connecting rod (252) is connected with the elastic pressure applying mechanism (24), and the driving member (251) is used for driving the connecting rod (252) to rotate to drive the opening and closing plug (23) to rotate through the elastic pressure applying mechanism.

5. The hot runner system for injection molding according to claim 4, characterized in that: The opening and closing plug (23) is arranged eccentrically to the connecting rod (252). The opening and closing plug (23) has an opening position and a closing position; when the opening and closing plug (23) is located at the opening 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 surface (2212), and the discharge channel (22) is opened; when the opening and closing plug (23) is located at the closing 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. The hot runner system for injection molding according to claim 5, wherein: The reduced diameter part (221) divides the space in the discharge channel (22) into a first cavity (222) and a second cavity (223) from top to bottom; the opening and closing plug (23) is provided with a first backflow hole (232) communicating with the second cavity (223), the connecting column (241) is provided with a second backflow hole (2411) communicating with the first backflow hole (232), and the connecting rod (252) is provided with a third backflow hole (2521) communicating with the first cavity (222); When the opening and closing plug (23) is in the opening position or the closing position, the second backflow hole (2411) and the third backflow hole (2521) are not communicated; when the opening and closing plug (23) is located between the opening position and the closing position, the second backflow hole (2411) and the third backflow hole (2521) are communicated.

7. The hot runner system for injection molding according to claim 6, wherein: The connecting hole (242) is rotationally connected with a dredging rod (5), one end of the connecting column (241) close to the abutting spring (243) is provided with a containing hole (51) penetrating to the second backflow hole (2411), the dredging rod (5) penetrates the containing hole (51), and the dredging rod (5) is slidably attached to the containing hole (51); the dredging rod (5) is also inserted into the first backflow hole (232) and the second backflow hole (2411).

8. The hot runner system for injection molding according to claim 7, wherein: The dredging rod (5) is provided with a clearing blade (52) on the outer wall.

9. A hot runner system for injection molding according to any one of claims 1-8, characterized in that: The shunt plate (1) is provided with a mounting groove (15), and the mounting groove (15) is mounted with a heating pipe (151) for heating the shunt plate (1).

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

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