Dual gated injection molding machine

Abstract

The application relates to a double-injection-tube injection molding machine, and relates to the field of injection molding machines, which comprises an injection molding cylinder and a double-tube discharging mechanism. A flange butt joint is fixedly installed at the left side end of the injection molding cylinder. The double-tube discharging mechanism comprises a butt joint circular plate, two groups of discharging tubes are symmetrically and fixedly installed at the front end of the butt joint circular plate, a filtering assembly is arranged at the front end of the discharging tube, a butt joint discharging cylinder is arranged at the front end of the filtering assembly, a movable output tube is slidably arranged at the front end of the butt joint discharging cylinder, an electric heating pipe is embedded on the inner wall of the butt joint discharging cylinder, a high-temperature melt pressure sensor is fixedly installed on the discharging tube, a structure sleeve ring is fixedly sleeved outside the movable output tube, and two groups of electric telescopic rods are arranged at the front end of the butt joint circular plate. When one group of pipelines is blocked, the application can timely switch to the other group of pipelines to continue discharging, realizes pipeline switching under the non-stop state, effectively avoids the whole machine production stop caused by the discharging tube blockage, and guarantees the continuity of injection molding production and the production efficiency effect.

Description

Technical Field

[0001] This application relates to the field of injection molding machines, and in particular to a dual-injection-tube injection molding machine. Background Technology

[0002] Injection molding machines are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. In the injection molding process, molten plastic is plasticized in the injection molding machine barrel and then conveyed to the mold through the discharge pipe for injection molding.

[0003] In continuous production processes, small amounts of unmelted particles, carbonized lumps, or other solid impurities inevitably mix into the molten plastic. These impurities tend to accumulate gradually on the pipe walls or in narrow sections as they flow through the discharge pipe, eventually leading to blockage. Once the discharge pipe becomes blocked, the entire production line usually needs to be shut down for cleaning or pipe replacement, which not only disrupts the production rhythm and reduces production efficiency but also increases equipment maintenance costs and labor intensity. Furthermore, the process of restarting the machine after a blockage and waiting for the process parameters to stabilize also generates a large amount of waste.

[0004] Regarding the aforementioned technologies, the applicant believes that the following defects exist: the discharge pipeline of existing injection molding machines is usually designed as a single path, lacking effective pipeline redundancy and online blockage monitoring methods. Once the pipeline is blocked, the entire machine must be shut down for treatment, which seriously affects the continuity and stability of injection molding production and makes it difficult to meet the needs of efficient continuous production. Summary of the Invention

[0005] In order to enable rapid switching without stopping the machine when the discharge pipe of the injection molding machine is blocked, and to ensure the continuity and stability of injection molding production, this application provides a dual-injection-pipe injection molding machine.

[0006] This application provides a dual-injection-tube injection molding machine, which adopts the following technical solution: A dual-injection-tube injection molding machine includes an injection molding machine barrel, wherein a flange butt joint is fixedly installed on the left side end of the injection molding machine barrel; A dual-tube discharge mechanism includes a docking circular plate, two sets of discharge pipes are symmetrically fixedly installed at the front end of the docking circular plate, a filter assembly is provided at the front end of the discharge pipe, a docking discharge cylinder is provided at the front end of the filter assembly, and a movable output pipe is slidably provided at the front end of the docking discharge cylinder. An electric heating tube is embedded in the inner wall of the discharge cylinder, a high-temperature melt pressure sensor is fixedly installed on the discharge pipe, a structural collar is fixedly sleeved on the outside of the movable output pipe, and two sets of electric telescopic rods are symmetrically fixedly installed at the front end of the docking circular plate, with the output end of the electric telescopic rods fixed to the structural collar.

[0007] By adopting the above technical solution, the dual-tube discharge mechanism is equipped with two sets of symmetrically arranged discharge pipes. When one set of pipes becomes blocked due to impurity accumulation, it can switch to the other set of pipes in a timely manner to continue discharge, realizing pipe switching without stopping the machine. This effectively avoids machine downtime caused by blockage of a single path, ensuring the continuity and stability of injection molding production. Simultaneously, a high-temperature melt pressure sensor monitors the pressure changes inside the discharge pipe in real time. When the pipe pressure rises abnormally, it can promptly issue a blockage warning signal, providing accurate triggering basis for automatic switching. The movable output pipe's extension distance is independently controlled by an electric telescopic rod, flexibly adapting to the docking requirements of different molds or different working conditions, improving the equipment's versatility and adaptability.

[0008] Optionally, a drive motor is fixedly installed at the right end of the injection molding machine barrel, and a conveying auger is rotatably arranged inside the injection molding machine barrel. The output end of the drive motor is connected to the conveying auger via a coupling. By adopting the above technical solution, the drive motor drives the conveying auger to rotate inside the injection molding machine barrel through the coupling, continuously conveying the heated and plasticized molten material forward, ensuring continuous material supply during the injection molding process.

[0009] Optionally, a support plate is fixedly installed at the bottom of the injection molding machine barrel, and a controller is fixedly installed on the side wall of the support plate.

[0010] By adopting the above technical solution, the support plate base provides a stable support foundation for the injection molding machine barrel, ensuring the structural stability of the whole machine during operation; the controller is integrated into the side wall of the support plate base, which makes it convenient for operators to centrally control and set parameters of each actuator of the whole machine, improving the ease of operation and automation of the equipment.

[0011] Optionally, a feeding hot melt cylinder is fixedly connected to the upper side of the injection molding machine barrel, and a cylinder cover is rotatably installed on the top of the feeding hot melt cylinder.

[0012] By adopting the above technical solution, the feeding hot melt cylinder is used to feed plastic raw materials and preheat and melt them. The cylinder cover can be rotated and opened to facilitate the feeding operation. When closed, it can reduce heat loss and improve thermal efficiency.

[0013] Optionally, an electric valve is fixedly installed at the bottom of the feeding hot melt cylinder.

[0014] By adopting the above technical solution, the electric valve is used to control the connection and disconnection between the bottom of the feeding hot melt cylinder and the injection molding machine cylinder. It can control the feeding timing and feeding amount according to process requirements, and realize quantitative feeding control.

[0015] Optionally, the mating circular plate is screwed onto the end of the flange joint, and the bottom of the two sets of mating discharge cylinders are fixedly connected to a connecting plate seat, which is screwed onto the mating circular plate.

[0016] By adopting the above technical solution, the dual-tube discharge mechanism is detachably bolted together with the flange joint of the injection molding machine barrel via a docking circular plate. This ensures both the sealing and firmness of the connection, and facilitates subsequent disassembly, maintenance, and replacement. The connecting plate base fixes the two sets of docking discharge cylinders into one unit, enhancing the overall rigidity of the dual-tube structure and ensuring the positional accuracy and stability of the two sets of pipelines during switching.

[0017] Optionally, a temperature sensor is fixedly installed on the side wall of the discharge cylinder, the detection end of the temperature sensor extends to the inside of the discharge cylinder, and the detection end of the high-temperature melt pressure sensor extends to the inside of the discharge pipe.

[0018] By adopting the above technical solution, the temperature sensor monitors the temperature of the molten plastic inside the discharge cylinder in real time, which allows the controller to accurately adjust the heating power of the electric heating tube according to the set temperature, ensuring that the molten material maintains the optimal temperature range during the conveying process and avoiding the decrease in fluidity or solidification and blockage of the pipeline due to excessively low temperature; the detection end of the high-temperature melt pressure sensor extends directly into the discharge pipe, which can accurately sense changes in melt pressure and provide accurate data support for blockage warning and automatic switching.

[0019] Optionally, a solenoid valve is fixedly installed on the discharge pipe, a discharge inlet is provided at the end of the movable output pipe, and several sets of sealing rings are sleeved on the outer wall of the docking discharge cylinder, the sealing rings being made of heat-resistant ceramic material.

[0020] By adopting the above technical solution, the solenoid valve is used to control the independent on / off of each group of discharge pipelines. When a certain group of pipelines is blocked or needs to be switched, the corresponding pipeline can be closed by the solenoid valve to prevent the molten material from flowing back or leaking. The discharge constriction port is set at the end of the movable output pipe, which can gather and guide the output molten material, improving the accuracy of discharge. The heat-resistant ceramic sealing ring is sleeved on the outer wall of the docking discharge cylinder, and forms a sliding seal with the inner wall of the docking discharge cylinder when the movable output pipe slides. This not only ensures the sealing performance, but also has good high temperature resistance and wear resistance, extending the service life of the sealing components.

[0021] Optionally, the filter assembly includes a fixed cylinder base, with docking discs fixedly installed at both ends of the fixed cylinder base, and a metal mesh plate fixedly installed on the inner wall of the fixed cylinder base.

[0022] By adopting the above technical solution, the metal mesh plate is fixedly installed on the inner wall of the fixed cylinder seat, which can effectively intercept and filter large-diameter impurities, carbonized lumps and unmelted particles entrained in the molten plastic, preventing these impurities from entering the discharge cylinder and subsequent pipelines and causing blockages. This ensures the purity of the melt from the source and improves the quality of injection molded products.

[0023] Optionally, a hexagonal rotating post is rotatably installed between the docking discs. Several insertion ports are opened at the ends of the docking discs. Threaded posts are slidably installed inside the insertion ports. A hexagonal end block is fixedly connected to the inner end of the threaded post. An internal hexagonal slot is opened inside the hexagonal rotating post. The hexagonal end block is slidably inserted into the internal hexagonal slot. A compression spring is fixedly connected between the hexagonal end blocks on both sides. The threaded posts on both sides are screwed to the ends of the discharge pipe and the docking discharge cylinder, respectively.

[0024] By adopting the above technical solution, the filter assembly uses a detachable screw-in quick-installation structure. During installation, the entire filter assembly is placed between the discharge pipe and the connecting discharge cylinder. With the two ends abutting against each other, the threaded posts on both sides are pushed inwards, and the hexagonal end blocks slide inwards along the internal hexagonal slots, compressing the springs and causing the threaded posts to retract into the insertion port. Once the filter assembly is in position, a hexagonal wrench is inserted into the hexagonal rotating post and rotated. The hexagonal rotating post, through the internal hexagonal slots, synchronously drives the hexagonal end blocks and threaded posts on both sides to rotate. Under the outward abutting action of the compression springs, the threaded posts are screwed and locked to the internal threads at the discharge pipe and the connecting discharge cylinder ports, completing the installation. Disassembly is performed by reversing the operation. This structure allows for quick positioning and locking of the filter assembly without additional tools, making installation and disassembly convenient. It also facilitates the removal of the metal mesh plate for cleaning or replacement after a period of use, reducing maintenance difficulty and replacement costs.

[0025] In summary, this application includes at least one of the following beneficial technical effects: Non-stop switching and continuous production: By setting up two sets of symmetrically arranged discharge pipes, when one set of pipes is blocked, it can be switched to the other set of pipes in time to continue discharging, realizing pipe switching without stopping the machine. This effectively avoids the whole machine shutdown caused by the blockage of the discharge pipe, ensuring the continuity and efficiency of injection molding production. Accurate real-time blockage monitoring and early warning: The high-temperature melt pressure sensor monitors the pressure changes inside the discharge pipe in real time. When an abnormal increase in the pressure inside the pipe is detected, a blockage early warning signal can be issued in time, providing accurate and reliable data support for automatic switching and avoiding equipment damage or production abnormalities due to failure to detect blockage in time. The filter assembly is quick to install and remove and easy to maintain: The filter assembly adopts a detachable screw connection design with a hexagonal rotating column synchronously driven double-sided threaded column. The filter assembly and pipeline port can be quickly locked and released by simply rotating a hexagonal wrench. The installation and disassembly operations are simple and do not require special tools, which facilitates daily maintenance and cleaning and replacement of the metal mesh. Flexible and adjustable output with strong adaptability: The extension distance of the movable output tube is independently controlled by an electric telescopic rod. The extension length of the output end can be flexibly adjusted according to the interface position of different molds. It can adapt to various working conditions without changing the pipeline, thus improving the versatility and flexibility of the equipment. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of a dual-injection-tube injection molding machine according to this application. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of a dual-injection-tube injection molding machine. Figure 2 ; Figure 3 This is a three-dimensional disassembled structural diagram of a dual-injection-tube injection molding machine; Figure 4 This is a schematic diagram of the three-dimensional structure of the dual-tube discharge mechanism. Figure 1 ; Figure 5 This is a schematic diagram of the three-dimensional structure of the dual-tube discharge mechanism. Figure 2 ; Figure 6 This is a schematic diagram showing the three-dimensional disassembled structure of the dual-tube discharge mechanism. Figure 1 ; Figure 7 This is a schematic diagram showing the three-dimensional disassembled structure of the dual-tube discharge mechanism. Figure 2 ; Figure 8 This is a schematic diagram showing the three-dimensional disassembled structure of the dual-tube discharge mechanism. Figure 3 ; Figure 9 This is a schematic diagram showing the three-dimensional disassembled structure of the dual-tube discharge mechanism. Figure 4 ; Figure 10 This is a schematic diagram showing the three-dimensional structure of the filter assembly; Figure 11 This is a schematic diagram showing the three-dimensional cross-sectional structure of the filter component; Figure 12 It means Figure 11 Enlarged structural diagram of section A.

[0027] Explanation of reference numerals in the attached drawings: 1. Injection molding machine barrel; 2. Drive motor; 3. Feeding hot melt barrel; 4. Barrel cover; 5. Electric valve; 6. Support plate seat; 7. Controller; 8. Flange joint; 9. Dual-pipe discharge mechanism; 91. Docking round plate; 92. Discharge pipe; 93. Solenoid valve; 94. High-temperature melt pressure sensor; 95. Filter assembly; 96. Docking discharge barrel; 97. Connecting plate seat; 98. Temperature sensor; 99. Movable output pipe; 910. Discharge outlet; 911. Sealing ring; 912. Electric telescopic rod; 913. Structural collar; 914. Fixed barrel seat; 915. Docking round plate; 916. Metal mesh plate; 917. Hexagonal swivel column; 918. Insert; 919. Threaded column; 920. Hexagonal end block; 921. Socket; 922. Compression spring. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-12 This application will be described in further detail.

[0029] This application discloses a dual-injection-tube injection molding machine. (Refer to...) Figure 1 and Figure 2 The dual-injection-tube injection molding machine includes an injection barrel 1, which serves as the core cavity for plasticizing materials and conveying the melt. A flange connector 8 is fixedly installed on its left end for a detachable, sealed connection with the subsequent dual-tube discharge mechanism 9. A drive motor 2, either a servo motor or a frequency converter, is fixedly installed on the right end of the injection barrel 1. A conveyor auger is rotatably mounted inside the injection barrel 1, and the output end of the drive motor 2 is connected to the conveyor auger via a coupling. In actual operation, the drive motor 2 drives the conveyor auger to rotate at a set speed and torque, pushing the heated and molten plastic inside the injection barrel 1 forward to establish the melt pressure required for injection molding, thus achieving a continuous and stable feeding process.

[0030] Reference Figure 1 and Figure 3 A support plate 6 is fixedly installed at the bottom of the injection molding machine barrel 1. The support plate 6 is made of high-strength steel, welded or cast, providing a stable support foundation for the whole machine, effectively suppressing the vibration generated by the equipment during high-speed and high-pressure injection molding, and ensuring the relative positional accuracy between various components. A controller 7 is fixedly installed on the side wall of the support plate 6. The controller 7 integrates a PLC or embedded control module. The operator can centrally set and monitor parameters such as the speed of the drive motor 2, the heating temperature of the electric heating tube, the opening and closing timing of the electric valve 5, the on / off state of the solenoid valve 93, and the extension and retraction of the electric telescopic rod 912 through the touch screen or buttons of the controller 7, which greatly improves the ease of operation and automation level of the equipment.

[0031] A feeding hot melt cylinder 3 is fixedly connected to the upper side of the injection molding machine barrel 1. The feeding hot melt cylinder 3 uses an electric heating coil or electromagnetic heating method to preheat and melt the input plastic raw material. A cylinder cover 4 is rotatably installed on the top of the feeding hot melt cylinder 3. During feeding, the operator can manually or with the help of an auxiliary mechanism to rotate and open the cylinder cover 4, pour in the raw material, and then close the cylinder cover 4 to reduce heat loss to the air, maintain a stable temperature inside the hot melt cylinder, and improve heat utilization efficiency. An electric valve 5 is fixedly installed at the bottom of the feeding hot melt cylinder 3. The electric valve 5 is controlled by a controller 7 and opens or closes at regular intervals according to the injection molding process rhythm, thereby precisely controlling the amount of molten material falling into the injection molding machine barrel 1 each time, realizing quantitative feeding, and avoiding product weight fluctuations caused by uneven feeding.

[0032] Reference Figures 4 to 7The dual-pipe discharge mechanism 9 includes a docking circular plate 91, which is screwed onto the end of the flange butt joint 8 to form a detachable sealed connection. Two sets of discharge pipes 92 are symmetrically fixedly installed at the front end of the docking circular plate 91, forming a redundant dual-pipe structure that serves as a backup for each other. A filter assembly 95 is installed at the front end of the discharge pipe 92, and a docking discharge cylinder 96 is installed at the front end of the filter assembly 95. A movable output pipe 99 is slidably installed at the front end of the docking discharge cylinder 96. A connecting plate seat 97 is fixedly connected to the bottom of both sets of docking discharge cylinders 96. The connecting plate seat 97 is screwed onto the docking circular plate 91, fixing the two sets of discharge pipes into a rigid whole. This ensures that no relative displacement occurs between the two sets of pipes during pipe switching or when the movable output pipe 99 extends or retracts, guaranteeing the accuracy and repeatability of the connection with the mold gate.

[0033] Reference Figures 6 to 9 An electric heating element is embedded in the inner wall of the discharge cylinder 96. These elements are evenly distributed circumferentially or axially along the cylinder. Under the control of the controller 7, they continuously heat the melt inside the cylinder to prevent the molten plastic from cooling down, causing temperature drops, increased viscosity, or even solidification and blockage during transport. A high-temperature melt pressure sensor 94 is fixedly installed on the discharge pipe 92. The sensor's detection end extends directly into the inside of the discharge pipe 92, enabling real-time and accurate sensing of the melt pressure inside the pipe. When a set of discharge pipes begins to become blocked due to the gradual accumulation of unmelted particles or carbonized agglomerates, the melt pressure in that pipe will show an abnormally rising trend. Once the pressure exceeds the preset threshold of the controller 7, it is determined that a blockage has occurred, triggering an automatic switching program.

[0034] A temperature sensor 98 is fixedly installed on the side wall of the discharge cylinder 96. The detection end of the temperature sensor 98 also extends into the inside of the discharge cylinder 96, directly contacting the molten material. The temperature sensor 98 feeds back the real-time temperature to the controller 7. After comparing it with the set process temperature, the controller 7 dynamically adjusts the heating power of the electric heating tube to form a closed-loop temperature control, ensuring that the melt always flows within the optimal processing temperature window. This not only prevents low-temperature blockage but also avoids plastic degradation due to excessive temperature, thereby improving the consistency of product quality.

[0035] Reference Figures 4 to 6A structural collar 913 is fixedly sleeved on the outside of the movable output pipe 99. Two sets of electric telescopic rods 912 are symmetrically fixedly installed on the front end of the docking circular plate 91, and the output end of the electric telescopic rods 912 is fixedly connected to the structural collar 913. When the injection molding machine faces different molds, the mold gate position or interface depth is often different. At this time, the controller 7 can independently control the extension and retraction of each set of electric telescopic rods 912, driving the movable output pipe 99 to slide forward or backward in the docking discharge cylinder 96, flexibly adjusting the extension distance of the end of the movable output pipe 99, so as to accurately dock with the mold gate without replacing the pipeline or adding adapter parts, which greatly improves the versatility of the equipment and the ability to quickly change molds.

[0036] The end of the movable output pipe 99 is provided with an outlet 910, which is tapered and constricted to gather and guide the output molten material, allowing the melt to be injected into the mold gate in a concentrated jet form, reducing melt splashing and overflow, and improving injection molding accuracy. Several sets of sealing rings 911 are fitted on the outer wall of the connecting discharge cylinder 96. The sealing rings 911 are made of heat-resistant ceramic material or filled with high-temperature self-lubricating materials such as polytetrafluoroethylene. When the movable output pipe 99 slides repeatedly, the sealing rings 911 form a reliable sliding seal with the inner wall of the connecting discharge cylinder 96, preventing leakage of high-temperature, high-pressure melt from the gap, and also providing good wear resistance and a long service life.

[0037] A solenoid valve 93 is fixedly installed on the discharge pipe 92. The solenoid valve 93 is a two-position, two-way high-temperature solenoid valve, controlled by the controller 7. During normal production, only one set of solenoid valves 93 is open, while the other set of solenoid valves 93 is closed as a backup. When the high-temperature melt pressure sensor 94 detects a blockage in the working pipe, the controller 7 immediately executes a switching procedure: first, it opens the electric heating element and solenoid valve 93 on the backup pipe; after the temperature of the backup pipe stabilizes, it closes the solenoid valve 93 of the blocked pipe; and, as needed, it can drive the electric telescopic rod 912 to retract the movable output pipe 99 of the blocked pipe, disengaging it from the mold gate. The entire switching process can be completed within seconds, with production almost uninterrupted.

[0038] Reference Figures 10 to 12 The filter assembly 95, serving as a crucial barrier to prevent impurities from entering subsequent pipelines, has the following structure: it includes a fixed cylinder base 914, with docking discs 915 fixedly installed at both ends of the fixed cylinder base 914, and a metal mesh plate 916 fixedly installed on the inner wall of the fixed cylinder base 914. The metal mesh plate 916 is a multi-layer sintered stainless steel mesh or perforated mesh, with the mesh size selected according to product requirements. It can effectively intercept large-diameter impurities, carbonized agglomerates, and incompletely melted particles entrained in molten plastic, reducing the causes of blockage at the source and ensuring the purity of the melt and the appearance quality of the product.

[0039] To facilitate quick assembly and disassembly of the filter assembly 95 for cleaning or replacement of the metal mesh plate 916, the filter assembly 95 features a unique quick-assembly structure. Specifically, hexagonal rotating posts 917 are rotatably mounted between the docking discs 915. Several insertion ports 918 are provided at the ends of the docking discs 915. Threaded posts 919 are slidably inserted into the inner sides of the insertion ports 918. Hexagonal end blocks 920 are fixedly connected to the inner ends of the threaded posts 919. Internal hexagonal slots 921 are provided inside the hexagonal rotating posts 917. The hexagonal end blocks 920 are slidably inserted into the internal hexagonal slots 921. Compression springs 922 are fixedly connected between the two hexagonal end blocks 920. The two threaded posts 919 are screwed to the ends of the discharge pipe 92 and the docking discharge cylinder 96, respectively.

[0040] When installing the filter assembly 95, the operator places the entire fixed cylinder base 914 into the gap between the discharge pipe 92 and the docking discharge cylinder 96. As the two ends gradually approach each other under the tension of the connecting plate base 97 or the pre-tightening of the bolts, the end faces of the discharge pipe 92 and the docking discharge cylinder 96 push the threaded posts 919 on both sides inward. The hexagonal end block 920 slides inward along the internal hexagonal socket 921 and compresses the compression spring 922. The threaded post 919 then retracts into the inside of the socket 918, allowing the filter assembly 95 to be placed in place without obstruction. After the axis of the filter assembly 95 is aligned with the pipeline axis, the operator uses a standard hex wrench to insert into the internal hexagonal hole at the end of the hexagonal swivel post 917 and rotates it. The hexagonal swivel post 917 synchronously drives the hexagonal end blocks 920 and the threaded posts 919 on both sides to rotate through the internal hexagonal socket 921. Under the outward tension of the compression spring 922, the threaded end of the threaded post 919 remains in contact with the internal threads at the outlet pipe 92 and the docking outlet cylinder 96. After rotating several times, the double-sided synchronous screw connection is locked, completing the installation. For disassembly, simply rotate the hexagonal rotating post 917 in the opposite direction to disengage the threaded post 919 from the internal threads, allowing the filter assembly 95 to be easily removed for cleaning. This design eliminates the need for special tooling in the disassembly and assembly of the filter assembly, making operation extremely convenient and significantly reducing the difficulty and time cost of daily maintenance.

[0041] The implementation principle of a dual-injection-tube injection molding machine according to an embodiment of this application is as follows: First, plastic raw materials are fed into the top of the feeding hot melt cylinder 3. After the cylinder cover 4 is closed, the raw materials are preheated and melted in the feeding hot melt cylinder 3. The electric valve 5 is opened, and the molten material enters the injection molding machine cylinder 1 through the electric valve 5. The conveying auger driven by the drive motor 2 pushes the material forward to plasticize it. The plasticized molten material enters the docking circular plate 91 of the dual-tube discharge mechanism 9 through the flange joint 8. In the initial state, the solenoid valve 93 of one set of discharge pipes (discharge pipe 92, filter assembly 95, docking discharge cylinder 96 and movable output pipe 99) is open, and the other set of solenoid valves 93 is closed. The material is transported through this set of pipes and discharged to the mold through the discharge outlet 910 at the end of the movable output pipe 99.

[0042] During operation, the high-temperature melt pressure sensor 94 monitors the internal pressure of the discharge pipe 92 in real time, and the temperature sensor 98 monitors the internal temperature of the docking discharge cylinder 96 in real time. When the temperature sensor 98 detects that the temperature is lower than the set threshold, the controller 7 controls the electric heating tube embedded in the inner wall of the discharge end of the docking discharge cylinder 96 to start heating, ensuring that the molten material maintains the optimal temperature when it is conveyed to the discharge end. When the pressure inside the discharge pipe 92 rises abnormally due to the accumulation of impurities and reaches the preset threshold, the controller 7 determines that the pipeline is blocked, and then controls the solenoid valve 93 of that group to close, while simultaneously opening the solenoid valve 93 on another set of discharge pipes 92, completing the pipeline switching without stopping the machine, and continuing to supply material to the mold. After the solenoid valve 93 closes, the operator can clean the blocked pipeline or replace the filter component 95. The extension distance of the movable output pipe 99 is adjusted by the controller 7 controlling the electric telescopic rod 912. The electric telescopic rod 912 pushes or pulls the structural collar 913, causing the movable output pipe 99 to slide axially along the docking discharge cylinder 96 to adapt to different mold interface positions. When the metal mesh plate 916 of the filter assembly 95 needs to be cleaned or replaced, use a hex wrench to rotate the hexagonal rotating post 917 in the reverse direction. The hexagonal rotating post 917 drives the hexagonal end blocks 920 on both sides and the threaded post 919 to rotate in the reverse direction through the internal hexagonal slot 921, so that the threaded post 919 disengages from the internal threads of the discharge pipe 92 and the docking discharge cylinder 96 port, and the filter assembly 95 can be removed as a whole. During installation, place the filter assembly 95 between the discharge pipe 92 and the docking discharge cylinder 96, and rotate the hexagonal rotating post 917 in the forward direction to achieve quick screw connection and locking.

[0043] It should be further noted that the components involved in this application, such as the electric heating element, temperature sensor 98, high-temperature melt pressure sensor 94, controller 7, solenoid valve 93, electric telescopic rod 912, drive motor 2, and electric valve 5, are all existing technologies that have been fully disclosed in the field of injection molding equipment. Their specific selection, circuit connection, and control logic are contents that can be conventionally selected and set by those skilled in the art according to actual working conditions.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-injection-tube injection molding machine, characterized in that, include: The injection molding machine barrel (1) has a flange butt joint (8) fixedly installed on the left side end. The dual-pipe discharge mechanism (9) includes a docking circular plate (91), two sets of discharge pipes (92) are symmetrically fixedly installed at the front end of the docking circular plate (91), a filter assembly (95) is provided at the front end of the discharge pipe (92), a docking discharge cylinder (96) is provided at the front end of the filter assembly (95), and a movable output pipe (99) is slidably provided at the front end of the docking discharge cylinder (96). An electric heating tube is embedded in the inner wall of the discharge cylinder (96), a high-temperature melt pressure sensor (94) is fixedly installed on the discharge pipe (92), a structural collar (913) is fixedly sleeved on the outside of the movable output pipe (99), and two sets of electric telescopic rods (912) are symmetrically fixedly installed at the front end of the docking circular plate (91), and the output end of the electric telescopic rod (912) is fixed to the structural collar (913).

2. The dual-injection-tube injection molding machine according to claim 1, characterized in that, A drive motor (2) is fixedly installed on the right end of the injection molding machine barrel (1). A conveying auger is rotatably arranged inside the injection molding machine barrel (1). The output end of the drive motor (2) is connected to the conveying auger through a coupling.

3. The dual-injection-tube injection molding machine according to claim 1, characterized in that, A support plate seat (6) is fixedly installed at the bottom of the injection molding machine barrel (1), and a controller (7) is fixedly installed on the side wall of the support plate seat (6).

4. A dual-injection-tube injection molding machine according to claim 1, characterized in that, The upper side of the injection molding machine barrel (1) is fixedly connected to the feeding hot melt cylinder (3), and the top of the feeding hot melt cylinder (3) is rotatably installed with a cylinder cover (4).

5. A dual-injection-tube injection molding machine according to claim 4, characterized in that, An electric valve (5) is fixedly installed at the bottom of the feeding hot melt cylinder (3).

6. A dual-injection-tube injection molding machine according to claim 1, characterized in that, The docking round plate (91) is screwed onto the end of the flange joint (8), and the bottom of the two sets of docking discharge cylinders (96) are fixedly connected to a connecting plate seat (97), which is screwed onto the docking round plate (91).

7. A dual-injection-tube injection molding machine according to claim 1, characterized in that, A temperature sensor (98) is fixedly installed on the side wall of the docking discharge cylinder (96). The detection end of the temperature sensor (98) extends to the inside of the docking discharge cylinder (96), and the detection end of the high temperature melt pressure sensor (94) extends to the inside of the discharge pipe (92).

8. A dual-injection-tube injection molding machine according to claim 1, characterized in that, A solenoid valve (93) is fixedly installed on the discharge pipe (92), and a discharge inlet (910) is provided at the end of the movable output pipe (99). Several sets of sealing rings (911) are sleeved on the outer wall of the docking discharge cylinder (96), and the sealing rings (911) are made of heat-resistant ceramic material.

9. A dual-injection-tube injection molding machine according to claim 1, characterized in that, The filter assembly (95) includes a fixed cylinder seat (914), with docking discs (915) fixedly installed at both ends of the fixed cylinder seat (914), and a metal mesh plate (916) fixedly installed on the inner wall of the fixed cylinder seat (914).

10. A dual-injection-tube injection molding machine according to claim 9, characterized in that, A hexagonal swivel column (917) is rotatably installed between the docking discs (915). Several insertion ports (918) are opened at the ends of the docking discs (915). Threaded columns (919) are slidably inserted into the inner side of the insertion ports (918). A hexagonal end block (920) is fixedly connected to the inner end of the threaded column (919). An internal hexagonal slot (921) is opened on the inner side of the hexagonal swivel column (917). The hexagonal end block (920) is slidably inserted into the inner side of the internal hexagonal slot (921). A compression spring (922) is fixedly connected between the hexagonal end blocks (920) on both sides. The threaded columns (919) on both sides are screwed to the ends of the discharge pipe (92) and the docking discharge cylinder (96), respectively.

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