Multi-component injection molding machine with rotatable middle plate and four-injection control system

Abstract

The invention discloses a multi-component injection molding machine with a rotatable middle plate and a four-injection control system, and belongs to the technical field of injection molding equipment. The injection molding machine comprises a mold closing unit, a rotary table assembly arranged below a middle mold plate, a four-shot injection unit assembly distributed on the back surfaces of a fixed mold plate and a movable mold plate, and a control system electrically connected with the components. Accurate rotation of the middle plate is achieved through the rotary table assembly, the four-shot injection unit assembly and the closed-loop control system are matched, the injection molding process can be flexibly converted in multiple injection modes, and the production efficiency of multi-component injection molding and the product forming precision are remarkably improved. And meanwhile, the mold changing time can be effectively shortened, the forming consistency of multi-color and multi-material products is improved, cooperative control over the injection action and rotary positioning is optimized, and the beneficial effects of being high in automation degree, stable in operation, precise in control and the like are achieved.

Description

Technical Field

[0001] This application belongs to the technical field of injection molding machine equipment, specifically relating to a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. Background Technology

[0002] With the widespread application of plastic products in industries such as automobiles, electronics, electrical appliances, and daily necessities, multi-component injection molding technology has developed rapidly due to its ability to combine multiple materials or colors in a single molding process. Traditional single-component injection molding processes require multiple molding and assembly steps when dealing with multi-material composite products, which not only increases labor and time costs but also leads to problems such as insufficient bonding strength, large dimensional deviations, and assembly errors. Therefore, multi-component injection molding machines have become an important direction for the development of plastic processing equipment.

[0003] Existing multi-component injection molding equipment typically employs multiple injection units to inject different materials, but most systems still suffer from significant limitations in structural design and control methods. On one hand, to achieve multi-material injection, the machine needs a rotatable intermediate turntable or template to switch between different injection stations. However, traditional turntable mechanisms rely heavily on mechanical transmission or hydraulic control, resulting in insufficient rotational positioning accuracy and the accumulation of errors over long-term operation, affecting product consistency. On the other hand, synchronous control of multiple injection units is complex; achieving perfect matching of injection time, pressure, and temperature between different injection stations is difficult, leading to uneven internal stress or poor adhesion in the product. Furthermore, existing systems often employ a single master control mode, hindering independent intelligent collaborative control between injection units and limiting the flexible application of the equipment in multi-mode injection.

[0004] With the increasing market demand for high-precision, multi-functional composite products, traditional equipment is struggling to meet the requirements of high-end manufacturing in terms of mold-changing efficiency, rotational accuracy, control stability, and automation. This is especially true during the multiple injection molding processes of complex products, where issues such as lagging turntable position feedback and insufficient closed-loop control response are particularly prominent, leading to increased mold closing deviations and higher defect rates.

[0005] However, how to achieve a compact, precisely controlled, and highly reliable multi-component injection molding equipment within a limited space remains a key challenge in current technological development. Summary of the Invention

[0006] One objective of this application is to provide a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. This injection molding machine, by configuring a turntable assembly below the intermediate plate, enables the intermediate plate to achieve high-precision 180° reciprocating rotation. A servo motor and gear ring bearing combination structure ensures the accuracy and stability of the rotational motion. Compared to the limitation of traditional injection molding machines that can only perform a single injection, this structure can continuously complete two, three, or even four injections of multiple components or multiple colors in a single mold closing process, thereby achieving efficient molding of complex products.

[0007] The second objective of this application is to provide a control method for a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. This method achieves high-precision synchronization of the multi-mode injection process through programmed logic control of the intermediate plate rotation angle and the injection stage movement. Simultaneously, it ensures smooth transition, precise positioning, and overshoot-free stopping of the intermediate plate during high-speed rotation, greatly improving system response speed and control stability.

[0008] To achieve the above objectives, the first aspect of this application provides a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system, comprising: A mold-closing unit is mounted on a frame. The mold-closing unit assembly includes a fixed template, a movable template, and an intermediate template disposed between the fixed template and the movable template. A turntable assembly is fixedly installed below the intermediate template. The intermediate plate can be supported by the turntable assembly and can rotate precisely around the central axis of the frame. The four-shot injection unit assembly includes a first injection unit group and a second injection unit group, which are respectively disposed on the back of the fixed template and the moving template. The control system is electrically connected to the turntable assembly and the four-shot injection unit assembly, respectively.

[0009] Furthermore, the turntable assembly includes a turntable, a servo motor, a drive gear, a gear ring bearing, a turntable, and a locking mechanism.

[0010] Furthermore, both the turntable and the turntable are rectangular blocks and disks with a circular through hole at the center, and the intermediate plate is located at the lateral center of both the turntable and the turntable.

[0011] Furthermore, mounting bases are provided on both sides of the bottom of the turntable, and the mounting bases are engaged with the guide rails provided on the frame to slide the turntable on the frame.

[0012] Furthermore, the servo motor is fixedly mounted on the bottom of the turntable, and the servo motor is positioned between two mounting bases.

[0013] Furthermore, the drive gear is positioned above the servo motor and engages with the output end of the servo motor, and the drive gear is embedded inside the turntable.

[0014] Furthermore, the gear ring bearing is arranged in a ring at the bottom of the turntable.

[0015] Furthermore, the gear ring bearing includes an outer ring and an inner ring, the outer ring being fixedly connected to the turntable by screws, and the inner ring being fixedly connected to the turntable by screws.

[0016] Furthermore, clamping plates are provided on both sides of the intermediate plate, and the clamping plates are positioned above the turntable. The clamping plates are fixedly connected to the intermediate plate and the turntable respectively by screws.

[0017] Furthermore, a positioning key is provided between the turntable and the intermediate plate, and the positioning key is symmetrically arranged on both sides of the central axis of the intermediate plate.

[0018] Furthermore, the positioning key is fixedly connected to the intermediate plate and the turntable respectively by screws.

[0019] Furthermore, the locking structure is located at one corner of the turntable.

[0020] Furthermore, the turntable is provided with two V-shaped blocks, which are symmetrically arranged on both sides of the center of the turntable and are on the same straight line as the locking mechanism.

[0021] Furthermore, the locking structure includes a V-shaped pin, a connecting block, a guide copper sleeve, and a push cylinder.

[0022] Furthermore, the V-shaped pin is located at the center of the locking structure, and guide copper sleeves are provided on both sides of the V-shaped pin, with push cylinders provided on both sides of the guide copper sleeves; the connecting block is located at the bottom of the locking structure.

[0023] Furthermore, at least one photoelectric sensor is provided at the bottom of the turntable, which is used to detect the rotational position of the intermediate plate at a preset angle; a rotary encoder is provided inside the servo motor to detect the rotational angle of the intermediate plate, and the servo motor and the photoelectric sensor work together to accurately realize closed-loop control of the rotational angle of the intermediate plate.

[0024] Furthermore, the first injection unit group includes a first main injection stage and a first auxiliary injection stage; the second injection unit group includes a second main injection stage and a second auxiliary injection stage.

[0025] Furthermore, each of the sub-launching stations includes a plasticizing unit and a plasticizing seat connected in sequence, with a hydraulic cylinder connected to one end of the plasticizing seat.

[0026] Furthermore, a firing platform base is provided below the plasticizing seat, and the auxiliary firing platform is slidably mounted on the firing platform bracket via the firing platform base.

[0027] Furthermore, the injection stage support is disposed on the top of the main injection stage, and a linear guide rail is disposed on the injection stage support. The linear guide rail is disposed below the plasticizing seat, thereby allowing the plasticizing seat to move along the linear guide rail.

[0028] Furthermore, the firing platform support is equipped with a position electronic ruler, which is located at the end of the firing platform base.

[0029] Furthermore, the control system includes a main control panel and a secondary control panel.

[0030] Furthermore, the main control screen integrates the control programs for the first main firing station and the second main firing station; the secondary control screen integrates the control programs for the first secondary firing station and the second secondary firing station.

[0031] Furthermore, the main control screen independently controls the first main firing station and the second main firing station, and the secondary control screen independently controls the first secondary firing station and the second secondary firing station.

[0032] This application also provides a control method for a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. The method, using the aforementioned multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system, includes the following steps: S1: After the control system starts, the turntable is driven to perform preprocessing; S2: The control system controls the mold closing unit to close the moving template and the fixed template, and then controls the four-shot injection unit to perform multi-mode injection actions to perform injection. S3: After injection, the control system controls the mold closing unit to open the mold and remove the product.

[0033] Furthermore, in step S1 above, the preprocessing step is as follows: S101: Read the initial position value of the servo motor's built-in rotary encoder and define the initial position value as the starting position of the intermediate plate turntable; S102: After the control system drives the turntable to rotate 360°, it reads the final position value of the rotary encoder built into the servo motor and defines the final position value as the final position of the middle plate turntable. S103: The control system drives the turntable back to the starting position.

[0034] Furthermore, in step S2 above, the multi-mode injection action includes a single-shot mode, a two-shot mode, a three-shot mode, and a four-shot mode.

[0035] Furthermore, in step S2 above, the specific steps for performing the injection are as follows: S201: The control system determines the injection mode of the injection molding machine at this time; S202: If it is a single injection mode, the control system controls the mold closing unit to close the moving platen and the fixed platen, and then controls any one of the injection stations in the four-injection unit assembly to perform the injection action to complete the first injection. If it is a two-shot, three-shot, or four-shot mode, the control system controls the mold closing unit to close the moving template and the fixed template, and then controls the four-shot injection unit to perform the injection action to complete the first injection and then perform the second injection.

[0036] Furthermore, the specific steps of the second injection are as follows: After the first injection is completed, the control system controls the mold closing unit to open the mold; The control system controls the servo motor to drive the turntable assembly, causing the middle plate to rotate 180°. When the intermediate plate rotates to the predetermined angle, the control system drives the oil cylinder to push the V-shaped pin of the locking mechanism into the V-shaped block on the turntable, thereby locking the intermediate plate. The control system executes the mold closing command again, causing the mold to close, and the selected injection unit group performs the second injection molding operation according to the preset mode.

[0037] Furthermore, in step S204 above, during the rotation of the intermediate plate, the encoder of the servo motor provides real-time feedback of the intermediate plate rotation angle signal, and the photoelectric sensor detects the actual position signal of the intermediate plate in real-time. Together, they achieve closed-loop control of the rotation position.

[0038] The embodiments of this application have the following technical effects: (1) This application fixes the intermediate plate onto a turntable assembly mounted on a guide rail structure, and drives it in concert with a servo motor, drive gear, and gear ring bearing. This enables the intermediate plate to rotate precisely around the central axis of the frame, allowing it to perform rapid, accurate, and repeatable positioning between different injection stations, significantly improving the efficiency and consistency of mold position switching in multiple injection production. The intermediate plate of existing horizontal through-shot injection molding machines is a fixed structure and cannot be rotated for positioning. This means that the injection molding equipment can only complete a single injection or a simple two-component injection process. When dealing with composite products of multiple colors and materials, multiple machines are often required to complete the molding step by step, which is not only inefficient, but also causes problems such as large dimensional deviations, insufficient bonding strength, and increased energy consumption due to multiple clamping and cooling processes between processes. This application introduces a rotatable intermediate plate structure, enabling the mold to complete multiple injection processes in one molding cycle, realizing automatic switching and repeatable positioning between multiple stations, fundamentally solving the technical bottleneck that existing equipment cannot achieve continuous composite injection. This structure integrates rotation, mold closing, and injection actions in the injection molding process, reducing human error and process waiting time, and significantly improving production efficiency. At the same time, due to the high-precision closed-loop control of rotation angle and position, the stacking accuracy of the product between multiple injections is significantly improved, and the surface quality and dimensional consistency of the product are reliably guaranteed, thus demonstrating excellent technical effects in the field of high-precision, multi-component product molding.

[0039] (2) This application adds a back-mounted injection unit to the existing through-jet injection machine structure, forming a multi-component injection molding system with four independent injection units. Traditional through-jet injection machines are limited in the number of injection units, which greatly restricts the process combination and makes it difficult to flexibly switch between different materials or colors in a single injection. To address this issue, this application adds a back-mounted injection unit to the existing through-jet injection machine structure. This structure breaks through the process limitation of the traditional through-jet injection machine of "one mold, two injections", enabling the equipment to switch between multiple process modes such as one injection, two injections, three injections, and even four injections in the same cycle, meeting the market's extensive demand for multi-material, multi-color, and multi-functional products. Compared with the prior art, the injection unit combination of this application is more flexible. Users can freely choose the number of injection units and working mode according to the mold structure and product characteristics, realizing the combination or independent operation of different injection units, greatly improving the adaptability and production flexibility of the equipment. This innovative structure not only reduces the economic burden on enterprises to repeatedly invest in multiple machines to cope with multi-process production, but also effectively saves factory space and setup time, further improving the overall utilization rate of equipment and manufacturing economy, thus demonstrating significant superior technical effects in the direction of energy conservation, consumption reduction and intelligent manufacturing.

[0040] (3) In traditional multi-injection molding equipment, multiple injection units are usually centrally managed by the same control system. The control commands are complex and data interaction is frequent, which easily leads to response lag, synchronization error and parameter coupling problems, resulting in mismatch between pressure curves and timing during multi-component injection. The dual-control architecture of main and auxiliary control panels proposed in this application effectively solves this control bottleneck. The control system integrates the control logic of the main injection station into the main control panel and separates the control logic of the auxiliary injection station from the auxiliary control panel, realizing a control strategy that combines distributed control and centralized coordination. Compared with the single control mode of the prior art, this solution can simultaneously take into account the synchronization of multi-injection and the independence of the system, so that each injection station can realize independent parameter setting and precise action response, which greatly improves the coordination consistency of each injection station during multi-component injection. The data interaction between the main and auxiliary control systems is real-time and stable, which not only improves the overall machine response speed and operation convenience, but also effectively reduces the difficulty of equipment maintenance and debugging. This technology significantly improves control accuracy and system safety while ensuring the stable operation of complex multi-station injection molding machines, providing an advanced solution for intelligent control of injection molding equipment.

[0041] (4) In traditional injection molding equipment, rotation positioning and injection control are mostly separate structures. Rotation positioning relies on mechanical limits or manual calibration, which is prone to angle errors and position drift, thus affecting the alignment accuracy of multiple injections. This application introduces a dual detection mechanism of rotary encoder and photoelectric sensor into the servo drive system to construct a closed-loop control logic for the rotation angle of the intermediate plate, realizing real-time monitoring and dynamic correction of rotational displacement. Compared with the existing open-loop control method, the closed-loop feedback system of this application can automatically correct the angle error based on encoder feedback and sensor signals during rotation, significantly improving the positioning accuracy of the intermediate plate during multiple injection switching. After rotation positioning is completed, the locking mechanism driven by the hydraulic cylinder can achieve dual protection of mechanical precision positioning and electronic control, ensuring that the mold does not undergo micro-displacement under high-pressure injection conditions. Through this series of precision control methods, this application realizes the automation and precision of the entire process of injection molding machine rotation, mold closing, and injection, significantly improving the level of intelligent production and the reliability of product molding, fully demonstrating the creativity and technological progress of this invention in the field of multi-component injection molding. Attached Figure Description

[0042] The accompanying drawings, as part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application, but do not constitute an undue limitation of this application. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system according to this application; Figure 2 This is a schematic diagram of the overall structure of the intermediate plate and turntable assembly in a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system according to this application. Figure 3 This is a schematic diagram of a multi-component injection molding machine turntable assembly with a rotatable intermediate plate and a four-shot control system according to this application. Figure 4 This is a top view of the overall structure of the intermediate plate and turntable assembly in a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system according to this application. Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a schematic diagram of the structure of the first injection unit group in a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system according to this application.

[0043] The labels in the attached drawings are as follows: 1. Fixed template; 2. Moving template; 3. Intermediate plate; 4. Fixed template mold; 5. Moving template mold; 6. First injection unit group; 7. Second injection unit group; 8. Clamping plate; 9. Locking mechanism; 10. Drive gear; 11. Servo motor; 12. Turntable; 13. Turntable; 14. Guide rail; 15. V-block; 16. Guide copper sleeve; 17. Push cylinder; 18. V-pin; 19. Connecting block; 20. Cylinder; 21. Position electronic ruler; 22. Linear guide rail; 23. Main injection stage; 24. Injection stage support; 25. Plasticizing unit; 26. Plasticizing seat; 27. Injection stage seat; 28. Gear ring bearing. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0045] In the description of this application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of this application, and not all of the embodiments of this application. These partial embodiments are intended to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of this application.

[0048] This application proposes a multi-component injection molding machine and its control method with a rotatable intermediate plate and a four-shot control system. This application not only proposes systematic improvements to existing horizontal injection molding machines that cannot perform multiple injections, have limited number of injection stations, insufficient rotational accuracy, and a single control method, but also demonstrates outstanding technical advantages in improving equipment production efficiency, saving manufacturing costs, enhancing product consistency, and achieving multi-process compatibility.

[0049] Existing traditional horizontal injection molding machines typically have an injection station on the back of both the fixed and moving mold plates, with the intermediate mold plate being a fixed structure that cannot rotate or be repositioned. This limits the machine to single or two symmetrical injections, making it impossible to achieve multi-component, multi-color, or multi-material composite molding. To achieve multiple injections, manufacturers often need multiple machines to process the same product sequentially, increasing process complexity and leading to problems such as repeated mold clamping, product misalignment, and increased energy consumption. To address these shortcomings, this application introduces a rotatable intermediate plate structure into the mold closing unit. This allows the intermediate mold plate to rotate and be positioned precisely around the machine frame's central axis using a turntable assembly, enabling multi-station, multiple injection operations within a single molding cycle, significantly improving molding efficiency and production consistency. The introduction of the rotating intermediate plate allows the machine to complete multi-component injection processes within a single mold closing and opening cycle, avoiding energy waste and product errors caused by repeated heating, cooling, and clamping in traditional processes, thereby effectively improving the product's bonding strength and appearance quality. More importantly, this application constructs a closed-loop control system for the rotation of the intermediate plate through a dual detection mechanism of servo motor drive, rotary encoder, and photoelectric sensor. This enables real-time monitoring and automatic correction of the intermediate plate's angle during rotation, achieving a rotational positioning accuracy significantly higher than existing mechanical limit structures, ensuring repeatability and reliability of mold position switching between multiple injections. This closed-loop system, combined with a hydraulic cylinder-driven mechanical locking mechanism, ensures high-rigidity locking of the intermediate plate after rotation into position, effectively preventing displacement or deviation during high-pressure injection, guaranteeing the consistency of interlayer bonding and the stability of mold fit, thus achieving excellent results in the molding quality of precision composite products.

[0050] Furthermore, regarding the injection unit configuration and control system, traditional through-shot injection molding machines are limited by the number of injection units, enabling only single-shot bidirectional injection and failing to meet the complex process requirements of various material or color combinations. This application adds a back-mounted injection unit to the existing injection units on the back of the fixed and moving molds, creating an expanded structure of four injection units. The four injection units can operate independently or be flexibly combined according to process requirements, enabling automatic switching between one-shot, two-shot, three-shot, and even four-shot modes on a single machine, significantly broadening the equipment's application range. This four-shot structure achieves simultaneous, step-by-step injection and non-interfering operation of multiple injections on the same platform. It allows for flexible configuration of the number and sequence of injection units based on different plastic properties and mold structures, providing a highly compatible molding platform for multi-component, multi-functional products. This modular injection unit design not only reduces the burden of investment in multiple machine types for enterprises but also improves equipment reuse, saves floor space and setup time, and makes the production layout more compact and flexible. Compared to traditional injection molding machines that can only switch processes by changing molds or modifying equipment, the design of this application allows users to quickly switch between different injection station combinations through simple control operations, thereby meeting the flexible production needs of multiple products and small batches. This improvement has important practical significance in the context of the diversification and intelligence of modern manufacturing.

[0051] Regarding the control system, this application further proposes a dual-control panel architecture, breaking the limitations of existing multi-injection injection molding machines that rely on a single main control system for centralized management. Traditional multi-injection equipment, in multi-injection mode, often suffers from instruction delays, response lags, and synchronization deviations due to complex control logic and severe parameter coupling, making it difficult to guarantee the consistency and timing accuracy of multi-injection actions. The control system of this application adopts a distributed control strategy, with the main control panel managing the parameters of the main injection stations and core processes, such as mold closing, mold moving, intermediate plate rotation, and the main injection station injection process. The secondary control panel independently manages the temperature, position, and pressure parameters of the auxiliary injection stations, allowing each injection station to be set and operated independently. Data interaction between the main and secondary systems achieves timing synchronization and process coordination of multi-injection actions, thereby enabling precise control and flexible combination in complex multi-station injection processes. This dual-control architecture not only improves system response speed and control accuracy but also significantly reduces operational complexity and error risk, making the multi-injection injection process more intuitive, efficient, and manageable. Compared with existing centralized control systems, the hierarchical control mode of this application has significant improvements in data refresh rate, parameter decoupling and user interface friendliness. In particular, it can achieve seamless switching and stable operation when multiple concurrent operations and multiple mode switching are performed, demonstrating excellent system stability and scalability.

[0052] Please see Figure 1-6 This application provides a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. For example... Figure 1As shown, the body of this injection molding machine consists of a mold clamping unit, a turntable and intermediate plate mechanism, a four-shot injection unit group, and a locking and displacement detection mechanism.

[0053] Specifically, see Figure 1 The mold closing unit of this application includes a fixed template 1, a moving template 2, and an intermediate plate 3 disposed between the fixed template and the moving template to support the mold cavity and to cooperate with the molds on both sides.

[0054] Specifically, the fixed template 1 is a rigid mounting surface on one side of the frame, used to fix the fixed template mold 4. The fixed template mold 4 is coaxially connected to the surface of the fixed template by a group of bolts and is provided with a gate positioning structure that aligns with the injection port. The moving template mold 5 is fixed on the moving template, and the moving template mold 5 and the fixed template mold 4 cooperate to form an injection cavity.

[0055] Specifically, the intermediate plate 3 is located between the fixed template 1 and the moving template 2 and is rigidly connected to the turntable 12 through the clamping plate 8. The clamping plate 8 fixes the intermediate plate to the turntable with screws to ensure that the intermediate plate and the turntable are concentric and do not slide relative to each other during mold closing and injection.

[0056] Specifically, see Figure 2 and Figure 3 The turntable assembly is fixedly installed below the middle plate 3. Its core consists of a turntable 13, a turntable 12, a gear ring bearing 28, a servo motor 11, a drive gear 10, and a locking mechanism 9. The turntable 13 is a rectangular block structure with a central through hole. The central hole is coaxial with the hole in the middle plate 3 to accommodate the positioning key and the through wire. The turntable 12 is a disc with a matching central hole. It is rigidly connected to the middle plate through a clamping plate 8. The gear ring bearing 28 is arranged in a ring between the bottom of the turntable and the contact surface of the turntable.

[0057] Specifically, the gear ring bearing 28 consists of an inner ring and an outer ring. The outer ring is fixedly connected to the turntable 12 by screws, and the inner ring is fixedly connected to the turntable 13 by screws, so that the turntable 12 obtains reliable rolling support relative to the turntable 13 and forms a meshing tooth surface on the gear ring. The bottom of the turntable 13 is provided with mounting bases on both sides. The mounting bases are fitted with linear guide rails 22 on the frame, so that the turntable is slidably mounted on the frame, which facilitates the debugging and maintenance of the whole machine. The servo motor 11 is fixedly set between the two mounting bases at the bottom of the turntable 13. The output end of the servo motor 11 is fitted with a drive gear 10. The drive gear 10 is located inside the turntable and meshes with the gear ring of the gear ring bearing 28, so that the servo motor 11 transmits power to the turntable 12.

[0058] Specifically, see Figures 3-5 A locking mechanism 9 is provided at one corner of the turntable 13. The locking mechanism 9 includes a push cylinder 17, a V-shaped pin 18, a connecting block 19, and a guide copper sleeve 16.

[0059] Specifically, see Figure 5 The V-shaped pin 18 is located at the center of the locking structure 9, and guide copper sleeves 16 are provided on both sides of the V-shaped pin 18. Push cylinders 17 are provided on both sides of the guide copper sleeves 16 respectively; the connecting block 19 is located at the bottom of the locking structure 9.

[0060] Specifically, two V-shaped blocks 15 are symmetrically arranged at corresponding positions on the turntable 12. The V-shaped blocks are symmetrically arranged on both sides of the center of the turntable and are on the same straight line as the locking mechanism, so as to receive the V-shaped pins to achieve mechanical positioning.

[0061] Specifically, the servo motor 11 has a built-in rotary encoder and works with an external photoelectric sensor to achieve closed-loop angle control. At least one photoelectric sensor is set at the bottom of the turntable to detect the position feedback of the intermediate plate when it reaches the preset angle.

[0062] Specifically, the workflow of the turntable component is as follows: During the preprocessing stage, in the initial working phase of the turntable assembly, i.e., after the system is powered on and started, the control system executes a preprocessing program to complete the zero-point calibration of the intermediate plate. The rotary encoder inside the servo motor 11 is first activated and reads the initial angle signal, which is defined as the starting position of the intermediate plate. Subsequently, the control system issues a drive command, and the servo motor 11 rotates at a low speed and uniformly, driving the drive gear 10 to rotate. After the drive gear 10 meshes with the gear ring bearing 28, it transmits torque, causing the turntable 12 to rotate the intermediate plate 3 360° along the central axis of the frame. Throughout the rotation, the photoelectric sensor at the bottom of the turntable continuously detects the marker points or reflective marks on the edge of the turntable. Every certain angle of rotation, such as every 90° or 45°, a position signal is collected and compared with the angle signal fed back by the servo motor encoder. The system then calculates the rotation speed and angle deviation, achieving closed-loop control of the servo drive. After rotating to the final position, the control system records the final angle value of the servo motor encoder and automatically returns to the starting position, thereby establishing the angle reference for the intermediate plate rotation.

[0063] During a normal injection cycle, after the first injection unit completes injection and the mold closing unit opens, the control system sends a rotation command to the servo motor 11. At this time, the servo motor 11 starts according to a preset acceleration curve, smoothly engaging the gear ring bearing 28 via the drive gear 10 to rotate the turntable 12. Because the gear ring bearing 28 is a high-precision rolling structure with ball bearings between its inner and outer rings, the turntable maintains smooth rotation and minimal friction even when bearing the weight of the intermediate plate and mold. For subsequent product removal by a robotic arm, non-standard angles such as 45° or 60° can be set to facilitate part removal. The rotation angle of the servo motor 11 is fed back in real-time by an internal encoder, while a photoelectric sensor at the bottom of the turntable detects the markings on the edge of the turntable. When the detected signal corresponds to the target angle, the control system triggers a deceleration process. In the final stage of approaching the target position, the servo motor uses micro-step deceleration control, causing the turntable to slowly approach the target angle at a speed of less than 1° per second, thus eliminating the influence of mechanical inertia on positioning accuracy.

[0064] Once the intermediate plate 3 rotates to the predetermined angle and is confirmed in place by both the photoelectric sensor and the encoder, the control system immediately sends a locking signal. This pushes the hydraulic cylinder 17 to extend the piston under the action of the hydraulic system. The linear motion is transmitted to the V-shaped pin 18 through the connecting block 19. Guided by the guide copper sleeve 16, the V-shaped pin 18 slides precisely into the pre-set V-shaped block 15 groove on the turntable 12. The two sides of the V-shaped block are designed with symmetrical 45° bevels. When the V-shaped pin is inserted, it forms a self-centering effect, making the rotation center of the intermediate plate completely coincide with the central axis of the turntable. This ensures that the intermediate plate does not experience slight displacement under the action of injection pressure and mold clamping reaction force. At this time, the locking mechanism 9 forms a rigid connection, and the entire turntable 12 is in a static locked state.

[0065] After the intermediate plate is locked, the mold closing unit begins to close, and the moving template 2 moves toward the fixed template 1 and together with the intermediate plate 3 to form a new mold cavity.

[0066] Specifically, the servo motor can rotate to any angle according to the instructions of the control system, such as 90°, 180°, 270°, and 360°, which facilitates the subsequent picking up of parts by the robotic arm. When the rotation angle of the intermediate plate is varied, the number of V-blocks on the turntable can be dynamically adjusted according to the rotation angle setting, thereby achieving locking of the turntable assembly at any rotation angle.

[0067] Specifically, the quad-injection unit assembly includes a first injection unit group 6 and a second injection unit group 7.

[0068] Specifically, each injection unit includes a main injection stage 23 and a secondary injection stage. The main injection stage 23 bears the main injection force and structural support. The injection stage support 24 is set on the top of the main injection stage and fixed to the injection stage base 27 by bolts. The secondary injection stage is fixedly installed on the injection stage base 27 and slides along the linear guide rail 22 to realize the injection and retraction actions. The plasticizing unit 25 is installed at the end of the plasticizing seat 26 and is responsible for heating and melting the material in the barrel and pushing the molten material through the nozzle into the mold cavity by means of a screw or plunger. The hydraulic cylinder 20 is used to drive the plasticizing unit or push the injection body forward to complete the injection stroke. The position electronic ruler 21 is installed on the injection stage support 24 to detect the stroke of the secondary injection stage or injection stage base and feed it back to the control system to ensure accurate control of the injection volume and injection rate. The linear guide rail 22 between the injection stage base 27 and the injection stage support 24 ensures the smooth linear motion of the injection unit in the high-speed reciprocating process and reduces sway. The V-block 15, V-pin 18, etc. work together with the turntable assembly to realize intermediate plate positioning and mold switching between multiple injection processes.

[0069] Specifically, the control system is electrically connected to the turntable assembly and the four-injection unit assembly and consists of a main control panel and a secondary control panel. The main control panel integrates the control programs of the first and second main injection stages, and the secondary control panel integrates the control programs of the first and second secondary injection stages. Each control panel can independently control its corresponding injection stage or work together to execute injection programs in multiple modes such as one-shot, two-shot, three-shot, or four-shot. The control system is responsible for reading the feedback from the rotary encoder built into the servo motor 11 and the photoelectric sensor at the bottom of the turntable to achieve closed-loop control of the rotation angle of the intermediate plate. At the same time, it receives feedback from the position electronic ruler 21 to verify the injection stroke and the displacement of the hydraulic cylinder 20 and the push hydraulic cylinder 17. The control system calculates the drive signal according to the preset process curve and sends it to the servo motor, each hydraulic cylinder, and the locking mechanism, thereby realizing the coordinated operation of each component and ensuring high precision, high repeatability, and safety and reliability of the multi-component injection molding machine during multiple injections, indexing, and mold closing / opening processes.

[0070] This application also provides a control method for a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. The method for using the aforementioned multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system includes the following steps: S1: After the control system starts, the turntable is driven to perform preprocessing; S2: The control system controls the mold closing unit to close the moving template and the fixed template, and then controls the four-shot injection unit to perform multi-mode injection actions to perform injection. S3: After injection, the control system controls the mold closing unit to open the mold and remove the product.

[0071] Specifically, in step S1 above, the preprocessing step is as follows: S101: Read the initial position value of the servo motor's built-in rotary encoder and define the initial position value as the starting position of the intermediate plate turntable; S102: After the control system drives the turntable to rotate 360°, it reads the final position value of the rotary encoder built into the servo motor and defines the final position value as the final position of the middle plate turntable. S103: The control system drives the turntable back to the starting position.

[0072] Specifically, in step S2 above, the multi-mode injection action includes a single-shot mode, a two-shot mode, a three-shot mode, and a four-shot mode.

[0073] Specifically, in step S2 above, the specific steps for performing the injection are as follows: S201: The control system determines the injection mode of the injection molding machine at this time; S202: If it is a single injection mode, the control system controls the mold closing unit to close the moving platen and the fixed platen, and then controls any one of the injection stations in the four-injection unit assembly to perform the injection action to complete the first injection. If it is a two-shot, three-shot, or four-shot mode, the control system controls the mold closing unit to close the moving template and the fixed template, and then controls the four-shot injection unit to perform the injection action to complete the first injection and then perform the second injection.

[0074] Specifically, the steps for the second injection are as follows: After the first injection is completed, the control system controls the mold closing unit to open the mold; The control system controls the servo motor to drive the turntable assembly, so that the middle plate rotates at a preset rotation angle; When the intermediate plate rotates to the predetermined angle, the control system drives the oil cylinder to push the V-shaped pin of the locking mechanism into the V-shaped block on the turntable, thereby locking the intermediate plate. The control system executes the mold closing command again, causing the mold to close, and the selected injection unit group performs the second injection molding operation according to the preset mode.

[0075] Specifically, in step S204 above, during the rotation of the intermediate plate, the encoder of the servo motor provides real-time feedback of the intermediate plate rotation angle signal, and the photoelectric sensor detects the actual position signal of the intermediate plate in real-time. Together, they achieve closed-loop control of the rotation position.

[0076] Specifically, this application provides a multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system. Its control method is based on the high-precision coordination of the mechanical structure and the logic scheduling of the multi-mode injection station, realizing intelligent control of the entire process of multiple injections, multi-station rotation and multi-color and multi-material composite molding.

[0077] Specifically, system operation begins with the control system startup phase. The main control panel and the auxiliary control panel load the control programs for the first and second main firing stations and the first and second auxiliary firing stations, respectively. The internal program logic automatically detects the signal status of servo motors, cylinders, sensors, photoelectric detection devices, and position electronic rulers. After confirming that all equipment is in a safe standby state, the control system starts the preprocessing program. The rotary encoder built into the servo motor reads the initial position value, which is defined as the zero-position reference of the intermediate plate turntable. Subsequently, the control system drives the servo motor to rotate the turntable assembly 360°. The photoelectric sensor synchronously detects the position signal of the intermediate plate. The system compares the initial angle with the final angle data, automatically calibrates the rotation error, and returns to the zero position, completing the pre-rotation calibration of the intermediate plate, so that there is a unified reference angle in the subsequent multi-angle rotation process.

[0078] During the formal production cycle, the control system selects the injection mode according to the product process, which can be single injection mode, double injection mode, triple injection mode or quadruple injection mode.

[0079] Specifically, in single-injection mode, the system controls only a single injection station to complete one injection cycle. After the moving mold plate closes, the selected injection station applies pressure and completes the injection. Then, the mold closing unit opens the mold, the product is removed, and the cycle ends. This mode is suitable for molding single-color or single-material products. During this process, the intermediate plate remains stationary and does not rotate. The servo motor only maintains the angle locked state, and the V-shaped pin of the locking mechanism continuously engages with the V-block to ensure that the intermediate plate does not shift under force during injection.

[0080] Specifically, when the system operates in two-injection mode, the control logic automatically determines the working sequence of the injection units based on their arrangement. If the two injection units are located on the same side, i.e., the first main injection unit and the first auxiliary injection unit, or the second main injection unit and the second auxiliary injection unit, are arranged on the back of the same mold plate, the control system first executes the first injection action. After the first injection unit completes its injection, it can choose whether to perform a second injection based on process requirements. Normally, the system instructs the second injection unit to start the second injection to complete two-color or two-material molding. If the process requirements are special, it can also be set to allow both injection units to inject simultaneously, achieving mixed injection molding in one step. In this same-side two-injection control mode, the intermediate plate remains stationary, and the injection ports of both injection units simultaneously correspond to the same mold cavity area. The control system uses a synchronization algorithm to match the pressure curves and injection speeds of the two injection units to prevent plastic flow conflicts. After the second injection is completed, the control system sends an opening signal, the moving mold plate retracts, the product is removed, and one molding cycle of the entire two-injection mode is completed.

[0081] Specifically, when the system is in dual-injection mode and the two injection stations are located on opposite sides, i.e., installed on the back of the fixed mold plate and the moving mold plate respectively, the control logic of the dual-injection mode changes. In this case, the control system first selects one injection station to complete the first injection operation. After the first injection is completed and the mold closing unit opens, the control system issues a rotation command. The servo motor drives the drive gear to mesh with the gear ring bearing, rotating the turntable and intermediate plate to a predetermined angle. The rotation angle is typically 180°, causing the product molded in the first injection on the intermediate plate to rotate to the corresponding position on the other injection station. During the rotation, the servo motor encoder provides real-time angle feedback, and the photoelectric sensor detects the position signal of the intermediate plate, forming a closed-loop control to ensure that the rotation angle error is less than 0.05°. When the intermediate plate reaches the target position, the control system controls the push cylinder to move, causing the V-shaped pin to advance along the guide copper sleeve and embed into the V-block, achieving mechanical locking of the intermediate plate. At this time, the mold closing unit closes again, performing a second injection on the opposite injection station, thus achieving dual-color injection molding on opposite sides.

[0082] Specifically, when the system is configured to operate with three injection stations, the control logic supports both same-side and opposite-side injection station control. If two of the three injection stations are located on the same side, the control system can set these two injection stations to inject simultaneously or in stages. For example, the first main injection station can be executed first, and after that station completes, the first auxiliary injection station can continue the second injection. Alternatively, both injection stations can be executed simultaneously to achieve multi-layer or gradient color effects. After the same-side injection is completed, the control system controls the mold closing unit to open the mold, and the servo motor drives the turntable to rotate 180°, moving the injected mold cavity to the opposite injection station position. During the rotation of the intermediate plate, the drive gear at the output end of the servo motor transmits torque through the gear ring bearing, and the turntable and intermediate plate rotate smoothly. The position electronic ruler synchronously detects the cylinder stroke signal to ensure that the locking cylinder immediately enters the positioning preparation state when the rotation ends. When the intermediate plate rotates to the target angle, the V-shaped pin quickly inserts into the corresponding V-block, the locking mechanism closes, the turntable enters a stable locking state, and the third injection begins on the opposite injection station. The entire process is precisely coordinated by the timeline program of the control system. The injection sequence of the three injection stations is fully automatically connected with the rotation of the intermediate plate, ensuring that the molding cycle time of each mold cavity is consistent.

[0083] Specifically, the four-shot mode is the core mode of this multi-component injection molding machine control method. The four injection stations in the system can form two symmetrically arranged injection units. In four-shot mode, the control system typically sets two injection stations on one side (such as the first main injection station and the first auxiliary injection station) as a synchronous working group, and two injection stations on the opposite side (such as the second main injection station and the second auxiliary injection station) as another synchronous group. Each group of injection stations can choose synchronous injection or step-by-step injection. A typical process is as follows: When the system starts working, the control system first drives the mold closing unit to close the mold, clamping the moving platen and the fixed platen together with the intermediate platen. After the locking mechanism confirms that the V-shaped pin has been inserted into the V-block and provides a locking signal, the first main injection station and the first auxiliary injection station perform the first stage of injection simultaneously or separately according to the preset injection curve. The pressure, speed, and screw displacement data of the two injection stations are monitored in real time by the main control panel. If any deviation is detected, the system automatically corrects to maintain injection synchronization. After the first stage of injection is completed, the control system controls the hydraulic cylinder to open the mold, the intermediate platen unlocks, and the servo motor calculates the rotation angle according to the four-shot program, driving the turntable to rotate 180°. During rotation, the photoelectric sensor detects the identification signal and issues a deceleration command. The servo motor enters the micro-step positioning mode and stops when the rotation angle reaches 180°. The hydraulic cylinder is then pushed to insert the V-shaped pin into the next set of V-blocks to achieve mechanical positioning. Subsequently, the system locks the angle, and the mold closing unit closes the mold again. At this time, the second main injection station and the second auxiliary injection station on the opposite side perform injection simultaneously or separately.

[0084] In the continuous cycle of the four-injection mode, the control system, through time sequence management and parallel logic operations, ensures that each rotation of the intermediate plate corresponds to one or two injections by the two injection stations. The core algorithm of the control system is multi-axis synchronous coordination control, which internally calculates in real time the changes in servo motor speed curves, cylinder advance speed, locking delay, and injection pressure. When the servo motor approaches the target angle, the control system issues a locking preparation signal in advance, pre-charges the cylinder with hydraulic pressure, and the V-shaped pin can be inserted into the V-block at the moment the servo stops to achieve impact-free locking. To avoid vibration caused by the plasticizing unit remaining under high pressure during rotation, the control system automatically executes a depressurization command before rotation to ensure that the injection unit returns to a safe position.

[0085] Throughout the multi-injection cycle, the main control panel and the auxiliary control panel maintain synchronous communication via a data bus, controlling the independent movements of the main injection stage and the auxiliary injection stage respectively. Simultaneously, they receive angle feedback from the servo motors and position signals from the photoelectric sensors, forming a closed-loop control network for the entire system. When the system detects an angle error in the intermediate platen or an abnormal locking signal, it automatically pauses the injection process and issues an alarm to prevent mold misalignment and damage. After each injection cycle, the mold closing unit opens the mold, and a robotic arm or part removal mechanism removes the part from the intermediate platen. The control system then issues the start command for the next cycle, completing the full closed-loop operation of rotation, locking, injection, mold opening, and part removal.

[0086] The greatest advantage of this control method lies in achieving precise multi-angle rotation control of the intermediate plate through dual closed-loop feedback of servo motors and photoelectric sensors. During the subsequent part removal process by the robotic arm, the intermediate plate can quickly switch between multiple angles such as 90°, 180°, 270°, and 360°, with short rotation time and high angular accuracy. Simultaneously, the mechanical positioning of the locking mechanism and the hydraulic cylinder pressure control ensure the stability of the intermediate plate during each injection. The control system can flexibly set the synchronous, alternating, or step-by-step injection sequence of the injection unit according to different process requirements, enabling the equipment to complete both two-shot molding of two-color products and three-shot or four-shot composite injection molding of multi-layer or multi-material products. Through the coordinated control of the above complete process, this invention achieves precise matching between the mold clamping unit, the turntable assembly, and the four-shot injection unit assembly, ensuring that the intermediate plate maintains high precision and repeatability throughout multi-angle rotation and multi-shot linkage, thereby significantly improving the production efficiency and product quality of the injection molding machine.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-mentioned technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of this application.

Claims

1. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system, characterized by, include: A mold-closing unit is mounted on a frame. The mold-closing unit assembly includes a fixed template, a movable template, and an intermediate plate disposed between the fixed template and the movable template. A turntable assembly is fixedly installed below the intermediate template. The intermediate plate can be supported by the turntable assembly, enabling it to rotate precisely around the central axis of the frame. The turntable assembly includes a turntable, a servo motor, a drive gear, a gear ring bearing, a turntable, and a locking mechanism. At least one photoelectric sensor is installed at the bottom of the turntable to detect the rotational position of the intermediate plate at a preset angle. A rotary encoder is installed inside the servo motor to detect the rotation angle of the intermediate plate. The servo motor and the photoelectric sensor work together to accurately achieve closed-loop control of the rotation angle of the intermediate plate. The four-shot injection unit assembly includes a first injection unit group and a second injection unit group, which are respectively disposed on the back of the fixed template and the moving template. The control system is electrically connected to the turntable assembly and the four-shot injection unit assembly, respectively.

2. A multi-component injection molding machine having a rotatable intermediate plate and a four-way control system according to claim 1, characterized in that, The turntable and turntable are both rectangular blocks and disks with a circular through hole in the center, and the intermediate plate is located at the lateral center of the turntable and turntable.

3. A multi-component injection molding machine having a rotatable intermediate plate and a four-way control system according to claim 1, characterized in that, The turntable is provided with mounting bases on both sides of its bottom. The mounting bases are engaged with the guide rails on the frame to slide the turntable on the frame.

4. A multi-component injection molding machine having a rotatable intermediate plate and a four-way control system according to claim 1, characterized in that, The servo motor is fixedly mounted on the bottom of the turntable, and the servo motor is positioned between two mounting bases.

5. A multi-component injection molding machine with a rotatable intermediate plate and a four-shot control system according to claim 4, wherein the drive gear is disposed above the servo motor and engaged with the output end of the servo motor, and the drive gear is embedded inside the turntable.

6. A multi-component injection molding machine having a rotatable intermediate plate and a four-way control system according to claim 1, characterized in that, The gear ring bearing is arranged in a ring at the bottom of the turntable.

7. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 6, characterized in that, The gear bearing includes an outer ring and an inner ring. The outer ring is fixedly connected to the turntable by screws, and the inner ring is fixedly connected to the turntable by screws.

8. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 2, wherein, Clamping plates are provided on both sides of the intermediate plate, and the clamping plates are positioned above the turntable. The clamping plates are fixedly connected to the intermediate plate and the turntable respectively by screws.

9. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 8, characterized in that, A positioning key is provided between the turntable and the intermediate plate, and the positioning key is symmetrically arranged on both sides of the central axis of the intermediate plate.

10. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 9, wherein, The positioning key is fixedly connected to the intermediate plate and the turntable by screws respectively.

11. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 1, characterized in that, The locking structure is located at one corner of the turntable.

12. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 11, characterized in that, The turntable is provided with two V-shaped blocks, which are symmetrically arranged on both sides of the center of the turntable and are on the same straight line as the locking mechanism.

13. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 11, wherein, The locking structure includes a V-shaped pin, a connecting block, a guide copper sleeve, and a push cylinder.

14. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 11, wherein, The V-shaped pin is located at the center of the locking structure, and guide copper sleeves are provided on both sides of the V-shaped pin. Pushing cylinders are provided on both sides of the guide copper sleeves; the connecting block is located at the bottom of the locking structure.

15. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 1, wherein, The first injection unit group includes a first main injection station and a first auxiliary injection station; the second injection unit group includes a second main injection station and a second auxiliary injection station.

16. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 15, wherein, The auxiliary injection stations each comprise a plasticizing unit and a plasticizing seat connected in sequence, and the plasticizing seat is connected with an oil cylinder at one end.

17. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 16, wherein, A shooting seat is arranged below the plasticizing seat, and the auxiliary injection stations are slidingly installed on the shooting support through the shooting seat.

18. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 17, characterized in that, The shooting support is arranged on the top of the main injection station, and a linear guide rail is arranged on the shooting support and below the plasticizing seat, so that the plasticizing seat moves along the linear guide rail.

19. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 17, wherein, An electronic position gauge is arranged on the shooting support and at the end of the shooting seat.

20. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 15, wherein, The control system comprises a main control panel and an auxiliary control panel.

21. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 20, wherein, The main control panel integrates the control programs of the first and second main injection stations, and the auxiliary control panel integrates the control programs of the first and second auxiliary injection stations.

22. A multi-component injection molding machine having a rotatable intermediate plate and a four-ram control system according to claim 21, wherein, The main control panel independently controls the first and second main injection stations, and the auxiliary control panel independently controls the first and second auxiliary injection stations.

23. A method of controlling a multi-component injection molding machine with a rotatable middle plate and a four-way control system, using a multi-component injection molding machine with a rotatable middle plate and a four-way control system according to any one of claims 1 to 22, characterized in that The method comprises the following steps: S1: after the control system is started, the rotating table is driven to perform pretreatment; S2: after the control system controls the mold closing unit to close the movable mold plate and the fixed mold plate, the four-injection unit assembly is controlled to perform multi-mode injection action to perform injection; S3: after the injection is completed, the control system controls the mold opening unit to open the mold, and the product is taken out.

24. The method of claim 23, wherein the method further comprises: In the above S1 step, the pretreatment step is: S101: the initial position value of the built-in rotary encoder of the servo motor is read, and the initial position value is defined as the starting position of the intermediate plate rotating table; S102: after the control system drives the rotating table to rotate 360°, the final position value of the built-in rotary encoder of the servo motor is read, and the final position value is defined as the final position of the intermediate plate rotating table; S103: the control system drives the rotating table to return to the starting position.

25. The method of claim 23, wherein the method further comprises: In the above S2 step, the multi-mode injection action comprises one-injection mode, two-injection mode, three-injection mode and four-injection mode.

26. The method of claim 23, wherein the method further comprises: In the above S2 step, the specific steps of performing injection are: S201: the control system judges the injection mode of the injection molding machine at this time; S202: if it is one-injection mode, the control system controls the mold closing unit to close the movable mold plate and the fixed mold plate, and then controls any one of the four-injection unit assemblies to perform injection action to complete the first injection; If it is two-injection mode, three-injection mode or four-injection mode, the control system controls the mold closing unit to close the movable mold plate and the fixed mold plate, and then controls the four-injection unit assembly to perform injection action to complete the first injection and then perform the second injection.

27. The method of claim 26, wherein the method further comprises: The specific steps of the second injection are: After the first injection is completed, the control system controls the mold opening unit to open the mold; The control system controls the servo motor to drive the rotating table assembly, so that the intermediate plate rotates 180°; When the intermediate plate rotates to a predetermined angle, the control system drives the oil cylinder to push the V-shaped latch of the locking mechanism into the V-shaped block on the rotating disc, so as to lock the intermediate plate; The control system executes the mold closing instruction again, so that the mold is closed, and the selected injection unit assembly performs the second injection molding operation according to the preset mode.

28. The method of claim 27, wherein the method further comprises: During the rotation of the intermediate plate, the encoder of the servo motor feeds back the rotation angle signal of the intermediate plate in real time, and the photoelectric sensor detects the actual position signal of the intermediate plate in real time, and the two together realize closed-loop control of the rotation position.

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