A multi-functional multi-layer co-extrusion apparatus

Abstract

The application discloses a kind of multifunctional multilayer co-extrusion equipment, belong to plastic forming extrusion technical field.It includes multilayer co-extrusion die and several groups of modular extruder, each group of modular extruder is assembled with transparent master batch feeding cylinder, and the conveyor barrel for molten material on modular extruder is all connected to the input end of multilayer co-extrusion die to carry out multilayer co-extrusion, the conveyor barrel of each group of modular extruder is cut off on the side close to multilayer co-extrusion die, and lifting switching module is configured on the cut end, transparent particle plastic mixing unit and color master batch plastic mixing unit are integrated on lifting switching module, the switching mechanism of lifting switching module realizes the quick color changing function of multilayer co-extrusion equipment in small-batch customized production, can effectively solve the problem that the existing conventional equipment is fixed due to runner structure, needs to be globally stopped when color changing Screw and cylinder are cleaned, leading to low efficiency and raw material waste.

Description

Technical Field

[0001] This invention relates to the field of plastic molding and extrusion technology, and more specifically, to a multifunctional multilayer co-extrusion extrusion device. Background Technology

[0002] In the field of plastics processing, multi-layer co-extrusion equipment is a key piece of equipment for producing high-performance composite products. It is a new type of device in existing plastic molding technology. This type of device mainly uses the coordinated work of multiple extruders and co-extrusion dies to combine polymer melts with different properties into multi-layer structures to meet the needs of industries such as packaging and automobiles for functions such as barrier properties and strength. The existing multi-layer co-extrusion plastic molding technology performs relatively stably in large-scale continuous production. However, as the market shifts towards small-batch customization, its fixed flow channel structure leads to frequent shutdowns for adjustments during production changes, highlighting the contradiction of insufficient flexibility at the co-extrusion end in the production process.

[0003] In actual production, the need for frequent color changes in small-batch orders is particularly prominent. Traditional methods require a dedicated extruder for each color, and the screw and barrel need to be thoroughly cleaned when changing colors, resulting in low efficiency and waste of raw materials. Existing improvement solutions, such as shared extruders or external color-changing modules, attempt to simplify the process, but the workload of cleaning is not reduced by shared design, color difference is easy to occur, and the low integration of external units may affect melt uniformity, making it impossible to balance flexibility and quality requirements.

[0004] The root cause of the problem lies in the fixed flow channel structure of the existing equipment and the lack of an embedded switching mechanism. Although some technologies have attempted to introduce external coloring units, the compact internal space of the extruder and the difficulty of precise metering and mixing under high temperature and high pressure conditions mean that color changing still relies on a global shutdown, which exacerbates time and material loss in multi-variety order scenarios. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a multifunctional multilayer co-extrusion extrusion device, which aims to solve the above-mentioned technical problems.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A multi-functional multi-layer co-extrusion extrusion device includes a multi-layer co-extrusion die head and several sets of modular extruders. Each set of modular extruders is equipped with a transparent masterbatch feed cylinder, and the conveyor cylinders for melting materials on the modular extruders are connected to the input end of the multi-layer co-extrusion die head for multi-layer co-extrusion. The conveyor cylinders of each set of modular extruders are cut off on the side near the multi-layer co-extrusion die head, and a lifting switching module is configured on the cut-off end. The lifting switching module integrates a transparent granule plastic mixing unit and a color masterbatch plastic mixing unit.

[0008] The transparent granule plastic mixing unit and the masterbatch plastic mixing unit are both configured with a barrel structure corresponding to the conveyor barrel structure of the modular extruder. The masterbatch plastic mixing unit is additionally equipped with a masterbatch heat conveying unit for storing and melting the masterbatch.

[0009] When the transparent granule plastic mixing unit is connected to the modular extruder, it continues to convey transparent granule plastic melt material. When the color masterbatch plastic mixing unit is connected to the modular extruder, it mixes the color masterbatch melt material with the transparent granule plastic melt material originally conveyed in the modular extruder, so as to realize rapid color change co-extrusion in small-batch customized production.

[0010] As a further aspect of the present invention: the lifting switching module includes double-layer sealing sleeve heads fixedly connected to both ends of the cut-off end of each modular extruder conveyor barrel, and a first U-shaped fixing frame is fixedly connected between the two double-layer sealing sleeve heads. The first U-shaped fixing frame is used to maintain the parallel positioning of the two sides of the cut-off end. Each double-layer sealing sleeve head is slidably sealed with a sealing clamp, and a second U-shaped fixing frame is connected to the side of the sealing clamp on both sides. A first telescopic rod is fixedly installed on the axial end of the second U-shaped fixing frame. The telescopic end of the first telescopic rod is used to drive the second U-shaped fixing frame to reciprocate in the vertical direction. A color masterbatch plastic mixing unit and a transparent granule plastic mixing unit are assembled one above the other in the middle of the two sealing clamps. The reciprocating translation of the second U-shaped fixing frame is used to control the color masterbatch plastic mixing unit and the transparent granule plastic mixing unit to connect with the cut-off end of the modular extruder conveyor barrel.

[0011] As a further aspect of the present invention: the masterbatch plastic mixing unit includes a second conveying outer sleeve, a guide ring is fixedly installed at the middle position of the outer surface of the second conveying outer sleeve, the top of the guide ring is assembled and connected to the masterbatch heat conveying unit, a multi-functional stirring rod is movably installed inside the second conveying outer sleeve, a convex receiving ring cover communicating with the guide ring is fixedly installed at the middle position of the outer surface of the multi-functional stirring rod, and a sealing ring is fixedly installed on the outer edge sidewall of the convex receiving ring cover, which is sealed and clamped inside the guide ring, the interior of the multi-functional stirring rod is hollow, and a compound mixing module is configured at the middle position inside the cavity, and several first reserved conveying holes communicating with the convex receiving ring covers are arranged in a circular pattern at the middle position inside the multi-functional stirring rod, so as to convey the molten masterbatch material in the masterbatch heat conveying unit to the compound mixing module through the first reserved conveying holes.

[0012] As a further aspect of the present invention: the compounding module includes a conical funnel-shaped conveying cavity sleeve. Several externally extended receiving cylinders, each fixedly connected to a first pre-reserved conveying hole, are circumferentially fixedly installed on the outer surface of the conical funnel-shaped conveying cavity sleeve. The conical funnel-shaped conveying cavity sleeve is an overall structure with a conical cavity and a cylindrical structure extending outwards. The extended end of the cylinder is the feeding end of a modular extruder, and a discharge hood is fixedly installed at the end of the extended end. The outer edge of the discharge hood is tightly attached to the inner wall of a multi-functional stirring rod. A second pre-reserved conveying hole communicating with the discharge hood is opened on the surface of the multi-functional stirring rod. A multi-functional impeller strip communicating with the second pre-reserved conveying hole is fixedly installed on the outer surface of the multi-functional stirring rod. A multi-functional stirring head unit is movably installed in the conical opening of the conical funnel-shaped conveying cavity sleeve. The multi-functional stirring head unit compound-mixes the masterbatch molten material entering the conical funnel-shaped conveying cavity sleeve and conveys it to the multi-functional impeller strip through the discharge hood for rotary extrusion.

[0013] As a further aspect of the present invention: the multifunctional stirring head unit includes a cavity stirring head, and a plurality of arc-shaped liquid-guiding cavity strips are fixedly connected in a circular pattern on the outer surface of the cavity stirring head. The compound mixing module also includes a feeding impeller fixedly connected to the middle position of the side end of the cavity stirring head. The feeding impeller extends as a whole toward the center position of the discharge hood, and a guide plate is fixedly connected at the extended end. A friction sleeve is fitted tightly on the conical funnel-shaped conveying cavity sleeve on the extended cylinder. The inner wall of the friction sleeve is provided with a friction coating, and an external gear collar is fixedly connected to the outer surface of the friction sleeve. A drive module is also configured on the side of the conical funnel-shaped conveying cavity sleeve opposite to the extended cylinder. The drive module drives the multifunctional stirring head unit to rotate as a whole to perform compound mixing of the masterbatch molten material.

[0014] As a further aspect of the present invention: the driving module includes a first servo motor, and a liquid storage module is fixedly installed on the output end of the first servo motor. The liquid storage module includes a protective cylinder, and two closely fitted semi-circular liquid storage cylinders are fixedly installed inside the protective cylinder. Pumps are fixedly installed on the outside of the semi-circular liquid storage cylinders to extract reagents from their respective semi-circular liquid storage cylinders in real time. A gear disk is fixedly installed on the outside of the protective cylinder. The gear disk is movably attached to the side wall of the conical funnel-shaped conveying cavity sleeve, and the central end of the gear disk penetrates into the inside of the conical funnel-shaped conveying cavity sleeve and is fixedly connected to the side wall axis of the cavity stirring head. The driving module also includes a double-headed gear rod movably installed inside the second conveying outer sleeve. One gear head of the double-headed gear rod meshes with the gear disk, and the other gear head meshes with the outer gear sleeve, so as to drive the rotation of the cavity stirring head and the friction sleeve through the rotation of the gear disk.

[0015] As a further aspect of the present invention: the multifunctional stirring head unit further includes a conveying conduit fixedly installed inside the cavity stirring head, with a fan-shaped liquid distributor fixedly installed on the conveying conduit. The fan-shaped liquid distributor is attached to the inner side wall of the cavity stirring head. The outer side wall of the cavity stirring head is circumferentially provided with several first one-way valve holes corresponding one-to-one with the liquid distribution holes of the fan-shaped liquid distributor. An annular liquid distributor is fixedly installed on the outer surface of the conveying conduit. Several diversion conduits are circumferentially fixedly connected to the annular liquid distributor, and each diversion conduit corresponds to a different arc-shaped liquid guiding cavity strip and is connected to the interior of a different arc-shaped liquid guiding cavity strip. Several first one-way valve holes are also provided on the side wall of the arc-shaped liquid guiding cavity strip. Sealing joints are fixedly installed on the sides of the annular liquid distributor and the conveying conduit, and are connected to the output ends of the two pumps inside the protective cylinder through the center of the gear disk via the sealing joints.

[0016] As a further aspect of the present invention: both ends of the multifunctional stirring rod are open, and a second telescopic rod is fixedly installed on the end near the modular extruder. A semi-cylindrical locking block is fixedly installed on the output end of the second telescopic rod. A closing unit is configured on the end of the multifunctional stirring rod near the multi-layer co-extrusion die. The closing unit includes a magnetic insertion port, on which a magnetic insertion block is magnetically inserted. A second servo motor is fixedly installed on the outside of the magnetic insertion block, and an outer ring is fixedly installed on the outer surface of the second servo motor. The outer ring frame has its outer edge attached to the annular gap between the multi-functional stirring rod and the second conveyor sleeve. The outer edge of the outer ring frame has several fourth reserved conveying holes in a circular pattern. A rotating disk is fixedly installed on the output end of the second servo motor. The rotating disk is fitted entirely into the outer ring frame, and several third reserved conveying holes are also circumferentially opened on its outer edge. The overlapping state of the third and fourth reserved conveying holes controls the closing state of the annular gap between the multi-functional stirring rod and the second conveyor sleeve.

[0017] As a further aspect of the present invention: the multifunctional impeller strip includes a hollow impeller strip that is attached and wound around the outer surface of the multifunctional stirring rod. The interior of the hollow impeller strip is hollow, and several second one-way valve holes are sequentially opened along the edge of the wound impeller strip. A connecting conduit is fixedly connected to the side end of the hollow impeller strip. The connecting conduit is connected to the discharge hood through a second reserved conveying hole. An annular leakage isolation plate is fixedly installed on the convex receiving annular cover at the position of the annular gap between the multifunctional stirring rod and the second conveying outer sleeve. A replenishment conduit extending from the side end of the multifunctional stirring rod is provided on each of the semi-circular liquid storage cylinders.

[0018] As a further aspect of the present invention: the transparent granule plastic mixing unit includes a first conveying outer sleeve, and an extrusion screw is movably installed inside the first conveying outer sleeve. The extrusion screw is the same as the screw in the conveyor barrel of the modular extruder, and an extended connecting block is also configured on the side of the extrusion screw near the modular extruder. The extended connecting block has the same structure as the second telescopic rod and the semi-cylindrical locking block.

[0019] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0020] This solution utilizes a switching mechanism with an lifting switching module to enable rapid color changing in small-batch customized production of multi-layer co-extrusion equipment. It effectively solves the problems of low efficiency and material waste caused by the fixed flow channel structure of existing traditional equipment, which requires a complete shutdown for cleaning the screw and barrel during color changes, leading to inefficiency. By cutting off the conveyor barrel of the modular extruder near the co-extrusion die and integrating the lifting switching module, along with the coordinated control of the sealing clamp and telescopic rod, the transparent granule plastic mixing unit or the masterbatch plastic mixing unit can precisely connect to the cut-off end. This avoids the large cleaning workload of traditional shared extruders, allowing flow channel switching to be completed simply through vertical translation, significantly shortening changeover time and improving production continuity, especially adapting to the flexible needs of multi-variety orders.

[0021] By combining the compounding module inside the masterbatch plastic mixing unit with the multi-functional stirring head unit, the high uniformity of the masterbatch molten material and the basic transparent granular material is ensured. The material is dynamically re-stirred by the rotational shearing of the cavity stirring head and the centrifugal guiding effect of the arc-shaped liquid-guiding cavity strip. This solves the problem of color difference or pigment aggregation caused by insufficient mixing in traditional external color-changing modules. Through shearing under high temperature and high pressure, the high dispersion of pigments is achieved, further improving the color consistency and interface bonding quality of co-extruded products.

[0022] By retaining the basic functions of the modular extruder and expanding the switching unit, the rapid switching and compounding of transparent granules and masterbatch materials can be achieved without configuring a dedicated extruder. This not only reduces the time and material loss caused by frequent cleaning, but also ensures long-term operational stability through the controllable sealing of the closed unit and the real-time maintenance of the liquid replenishment conduit. Attached Figure Description

[0023] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the modular extruder of the present invention;

[0026] Figure 3 This is a partial structural diagram of the lifting switching module of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the color masterbatch plastic mixing unit of the present invention in a half-section view;

[0028] Figure 5 This is a schematic diagram of the multifunctional stirring rod of the present invention in a semi-sectional view.

[0029] Figure 6 This is a schematic diagram of the transparent particle plastic mixing unit of the present invention;

[0030] Figure 7 This is a schematic diagram of the multifunctional stirring head unit of the present invention in a disassembled state;

[0031] Figure 8 This is a schematic diagram of the structure of the driving module of the present invention;

[0032] Figure 9 This is a schematic diagram of the cavity stirring head of the present invention in a semi-sectional view;

[0033] Figure 10 This is a schematic diagram of the disassembled structure of the liquid storage module of the present invention;

[0034] Figure 11 This is a schematic diagram of the structure of the multifunctional impeller strip of the present invention;

[0035] Figure 12 This is a schematic diagram of the structure of the closed unit of the present invention.

[0036] Figure Labels

[0037] 1. Multi-layer co-extrusion die head; 2. Modular extruder; 3. Transparent masterbatch feed cylinder;

[0038] 4. Lifting switching module; 41. Double-layer sealing sleeve head; 42. First U-shaped fixing frame; 43. Sealing clamp; 44. Second U-shaped fixing frame; 45. First telescopic rod;

[0039] 5. Transparent granule plastic mixing unit; 51. First conveyor outer sleeve; 52. Extrusion screw; 53. Outer connecting block;

[0040] 6. Color masterbatch plastic mixing unit; 61. Second conveyor sleeve; 62. Material guide ring; 63. Multifunctional stirring rod; 64. Outer ring cover for receiving material; 65. Sealing ring; 66. First reserved conveying hole; 67. Annular leakage isolation plate;

[0041] 7. Masterbatch heat transfer unit;

[0042] 8. Compound mixing module; 81. Conical funnel-shaped conveying chamber sleeve; 82. Externally extended receiving cylinder; 83. Discharge hood; 84. Second reserved conveying hole;

[0043] 85. Multifunctional stirring head unit; 851. Cavity stirring head; 852. Arc-shaped liquid inlet cavity strip; 853. First one-way valve orifice; 854. Delivery conduit; 855. Fan-shaped liquid distributor head; 856. Annular liquid distributor head; 857. Diversion conduit; 858. Sealing joint;

[0044] 86. Material conveying impeller; 87. Guide disc; 88. Friction sleeve; 89. External gear collar;

[0045] 9. Drive module; 91. First servo motor;

[0046] 92. Liquid storage module; 921. Protective cylinder; 922. Semi-circular liquid storage cylinder; 923. Pump; 924. Liquid replenishment conduit;

[0047] 93. Gear disk; 94. Double-ended gear rod;

[0048] 10. Second telescopic rod; 11. Semi-cylindrical locking block;

[0049] 12. Closed unit; 121. Magnetic insertion port; 122. Magnetic insertion block; 123. Second servo motor; 124. Rotary disk; 125. Third reserved conveying hole; 126. Outer ring frame; 127. Fourth reserved conveying hole;

[0050] 13. Multifunctional impeller strip; 131. Hollow impeller strip; 132. Second one-way valve hole; 133. Connecting conduit.

[0051] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0052] The multi-functional multilayer co-extrusion extrusion equipment provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can also use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0053] like Figures 1 to 12As shown, this embodiment of the invention provides a multi-functional multi-layer co-extrusion extrusion device, including a multi-layer co-extrusion die 1 and several sets of modular extruders 2. Each set of modular extruders 2 is equipped with a transparent masterbatch feed cylinder 3, and the conveyor cylinders on the modular extruders 2 for melting materials are connected to the input end of the multi-layer co-extrusion die 1 for multi-layer co-extrusion. The conveyor cylinders of each set of modular extruders 2 are cut off on the side near the multi-layer co-extrusion die 1, and a lifting switching module 4 is configured on the cut-off end. The lifting switching module 4 integrates a transparent granule plastic mixing unit 5 and a color masterbatch plastic mixing unit 6.

[0054] The transparent granule plastic mixing unit 5 and the color masterbatch plastic mixing unit 6 are both configured as barrel structures corresponding to the conveyor barrel structure of the modular extruder 2. The color masterbatch plastic mixing unit 6 is additionally equipped with a color masterbatch heat conveying unit 7 for storing and melting the color masterbatch.

[0055] When the transparent granule plastic mixing unit 5 is connected to the modular extruder 2, it continues to convey transparent granule plastic melt material. When the color masterbatch plastic mixing unit 6 is connected to the modular extruder 2, it mixes the color masterbatch melt material with the transparent granule plastic melt material originally conveyed in the modular extruder 2, so as to realize rapid color change co-extrusion in small-batch customized production.

[0056] To address the technical problem that existing multi-layer co-extrusion equipment cannot quickly switch colors or materials without frequent shutdowns in small-batch customized production due to its fixed flow channel structure, the above-mentioned technical solution is adopted. The above-mentioned technical solution mainly consists of a multi-layer co-extrusion die head 1, a modular extruder 2, a transparent masterbatch feed cylinder 3, an lifting switching module 4, a transparent granule plastic mixing unit 5, a color masterbatch plastic mixing unit 6, and a color masterbatch heat transfer unit 7.

[0057] The multi-layer co-extrusion die 1 is a device used in the prior art to composite multiple strands of molten polymer into a multi-layer structure. It is composed of multiple stacked flow channels, each corresponding to a different material, ensuring uniform thickness and strong interfacial bonding. The input end of the multi-layer co-extrusion die 1 is connected to the conveyor barrels of several extruders and works in conjunction with the modular extruder 2. Through the introduction of the lifting switching module 4, the input flow channels of the multi-layer co-extrusion die 1 can be dynamically switched to adapt to the mixing of multiple plastic varieties. The modular extruder 2 is a plastic melting and conveying device in the prior art. Each modular extruder 2 includes a screw, barrel, and heating system, used to melt solid plastic granules into a homogeneous melt. The modular extruder 2 adopts a modular design, which is convenient for maintenance and configuration. Its conveyor barrel is directly connected to the input end of the multi-layer co-extrusion die 1 to achieve continuous co-extrusion. The transparent masterbatch feed cylinder 3 is an auxiliary component of the modular extruder 2, used to store and convey transparent plastic masterbatch. It adopts a hopper silo structure and feeds the masterbatch into the screw zone of the modular extruder 2 for melting by gravity and mechanical feeding.

[0058] Transparent masterbatch serves as a base material, providing structural layers in multi-layer co-extrusion. However, its single color limits the flexibility of customized production. Therefore, the transparent masterbatch feed cylinder 3 is a standard configuration, ensuring that the modular extruder 2 can continuously supply transparent granular plastic material. At the same time, the color masterbatch plastic mixing unit 6 is connected through the lifting switching module 4, so that the transparent masterbatch and color masterbatch are mixed. This avoids the waste of configuring a dedicated extruder for different colors. While maintaining the simplicity of the transparent masterbatch feed cylinder 3, the functionality is expanded through the external switching unit. In the existing technology, the flow channel of the modular extruder 2 is fixed, and the screw and barrel need to be cleaned when changing colors, resulting in low efficiency. The modular extruder 2 retains its basic functions, and achieves rapid flow channel switching by cutting off the side of the conveyor barrel near the multi-layer co-extrusion die head 1 and integrating the lifting switching module 4. The modular extruder 2 is connected to the transparent masterbatch feed cylinder 3 to supply basic transparent granular material, while the cut-off end allows the access of the color masterbatch plastic mixing unit 6 or the color masterbatch hot conveying unit 7, thereby improving the flexibility of the thermoplastic production process without changing the internal structure of the modular extruder 2.

[0059] like Figures 1 to 12As shown, the lifting switching module 4 includes a double-layer sealing sleeve head 41 fixedly connected to both ends of the cut-off end of the conveyor barrel of each modular extruder 2, and a first U-shaped fixing frame 42 is fixedly connected between the two double-layer sealing sleeve heads 41. The first U-shaped fixing frame 42 is used to maintain the parallel positioning of the two sides of the cut-off end. A sealing clamp plate 43 is slidably sealed on each double-layer sealing sleeve head 41, and a second U-shaped fixing frame 44 is connected to the side of the sealing clamp plate 43 on both sides. A first telescopic rod 45 is fixedly installed on the axial end of the second U-shaped fixing frame 44. The telescopic end of the first telescopic rod 45 is used to drive the second U-shaped fixing frame 44 to reciprocate in the vertical direction. A color masterbatch plastic mixing unit 6 and a transparent granule plastic mixing unit 5 are assembled one above the other in the middle of the two sealing clamp plates 43. The reciprocating translation of the second U-shaped fixing frame 44 is used to control the color masterbatch plastic mixing unit 6 and the transparent granule plastic mixing unit 5 to connect with the cut-off end of the conveyor barrel of the modular extruder 2.

[0060] The configured lifting switching module 4 is installed at the cut-off end of the conveyor barrel of each modular extruder 2. Its core function is to dynamically switch the connection state between the transparent granule plastic mixing unit 5 or the masterbatch plastic mixing unit 6 and the modular extruder 2 through an up-and-down moving mechanism. It is composed of a double-layer sealed sleeve head 41, a first U-shaped fixing frame 42, a sealing clamp 43, a second U-shaped fixing frame 44, and a first telescopic rod 45. Specifically, by redesigning the cut-off end structure, embedded flow channel switching is achieved, avoiding the drawbacks of global shutdown cleaning in traditional equipment and improving the efficiency of small-batch customized production. The double-layer sealing sleeve head 41 is fixedly connected to both ends of the cut-off end of the conveyor barrel of the modular extruder 2. Its cross-section is an H-shaped sleeve structure, forming a sealing channel. The H-shape allows the sealing clamp 43 to slide along its axial direction, while ensuring the sealing performance under high temperature and high pressure environment and preventing melt leakage. The double-layer sealing sleeve head 41 on both sides is fixedly connected by the first U-shaped fixing frame 42. The first U-shaped fixing frame 42 acts as an external support, applying a constraint force from the outside of the cut-off end to maintain the parallel positioning of the sleeve heads on both sides, preventing the flow channel from shifting or deforming, and providing a stable guiding foundation for the up and down movement of the first telescopic rod 45. The sealing clamp 43 is slidably sealed and assembled on the double-layer sealing sleeve head 41. It can move up and down along the axial direction of the H-shaped sleeve. The two sides are connected by the second U-shaped fixing frame 44 to form an integral frame structure. The axial end of the second U-shaped fixing frame 44 is located at the middle position of the outer side of the second U-shaped fixing frame 44. The first telescopic rod 45 is fixedly installed through the axial end. The extension and retraction of the first telescopic rod 45 drives the second U-shaped fixing frame 44 to reciprocate in the vertical direction. The first telescopic rod 45 serves as a driving component, precisely controlling the position of the sealing clamp 43 through linear motion. The first telescopic rod 45 is a telescopic device in the prior art whose telescopic stroke is controlled by an electronic control system. The moving distance can be set according to production needs. When it is necessary to switch to the color masterbatch plastic mixing unit 6, the first telescopic rod 45 retracts, driving the sealing clamp 43 to move downward, so that the interface of the color masterbatch plastic mixing unit 6 is aligned with the cut-off end of the modular extruder 2. When it is necessary to switch back to the transparent granule plastic mixing unit 5, the first telescopic rod 45 extends, pushing the sealing clamp 43 upward, so as to achieve docking with the transparent granule plastic mixing unit 5.

[0061] In order to ensure the stable movement and positioning of the first telescopic rod 45, it adopts servo hydraulic drive inside, combined with sensor feedback, to ensure that the sealing clamp 43 stops accurately during the movement, and avoids misalignment or leakage of the flow channel.

[0062] like Figures 1 to 12As shown, the masterbatch plastic mixing unit 6 includes a second conveyor sleeve 61. A guide ring 62 is fixedly installed at the middle position of the outer surface of the second conveyor sleeve 61. The top of the guide ring 62 is assembled with and connected to the masterbatch heat transfer unit 7. A multi-functional stirring rod 63 is movably installed inside the second conveyor sleeve 61. A convex receiving ring cover 64 communicating with the guide ring 62 is fixedly installed at the middle position of the outer surface of the multi-functional stirring rod 63. A sealing ring 65 is fixedly installed on the outer edge sidewall of the receiving ring cover 64, which is sealed inside the outer convex ring 62 of the guide. The interior of the multi-functional stirring rod 63 is hollow, and a compound mixing module 8 is arranged in the middle of the cavity. Several first reserved conveying holes 66 are arranged in a circular pattern in the middle of the multi-functional stirring rod 63, which communicate with the outer convex receiving ring cover 64, so that the molten color masterbatch material in the color masterbatch heat conveying unit 7 can be conveyed to the compound mixing module 8 through the first reserved conveying holes 66.

[0063] The masterbatch plastic mixing unit 6 is configured with a barrel structure corresponding to the conveyor barrel structure of the modular extruder 2. Its main function is to introduce, convey and mix the masterbatch molten material when the lifting switching module 4 connects it to the cut-off end of the modular extruder 2. This unit includes components such as the second conveyor outer sleeve 61, the guide outer protrusion ring 62, the multi-functional stirring rod 63, the outer protrusion receiving ring cover 64, the sealing protrusion ring 65 and the first reserved conveying hole 66. The masterbatch heat conveying unit 7 is a conventional coloring system component in the prior art. Its core function is to store and melt solid masterbatch to provide coloring material for the co-extrusion process. It includes the working end of the heating chamber, storage cylinder and metering pump. The color masterbatch hot conveying unit 7 is assembled and connected to the top of the guide outer convex ring 62. Its output end is connected to the flow channel of the guide outer convex ring 62. When the color masterbatch plastic mixing unit 6 is connected to the modular extruder 2, the color masterbatch hot conveying unit 7 continuously conveys the molten color masterbatch material to the guide outer convex ring 62, and then enters the internal cavity of the multi-functional stirring rod 63 through the outer convex receiving ring cover 64. The second conveying outer sleeve 61 serves as the main barrel of the color masterbatch plastic mixing unit 6. The multi-functional stirring rod 63 is movably assembled inside it and can rotate along the axis, playing a conveying and stirring role similar to a threaded rod. When the multi-functional stirring rod 63 rotates, the multi-functional impeller strip 13 structure on its outer surface pushes the molten material toward the multi-layer co-extrusion die head 1 to ensure continuous conveying. The interior of the multi-functional stirring rod 63 is hollow and is used to temporarily store and guide the molten masterbatch material. A compound mixing module 8 is configured in the middle of the cavity. The material is conveyed to the compound mixing module 8 through the first reserved conveying hole 66 for secondary mixing to improve uniformity.

[0064] The guide ring 62 is fixedly installed at the middle position of the outer surface of the second conveyor sleeve 61, and its top is connected to the masterbatch heat transfer unit 7, forming an inlet channel for the masterbatch material. The outer receiving ring cover 64 is fixed at the middle position of the outer surface of the multi-functional stirring rod 63, communicating with the guide ring 62 and sealed by the sealing ring 65. The outer receiving ring cover 64 is embedded inside the guide ring 62, and the sealing ring 65 is engaged with the inner wall of the guide ring 62 to ensure no leakage under high temperature and high pressure, allowing the masterbatch heat transfer unit 7 to smoothly enter the outer receiving ring cover 64 without contaminating the external environment. When the masterbatch heat transfer unit 7 injects material, the molten masterbatch flows into the outer receiving ring cover 64 through the guide ring 62, and then enters the cavity of the multi-functional stirring rod 63 through the first reserved conveying hole 66.

[0065] like Figures 1 to 12 As shown, the compound mixing module 8 includes a conical funnel-shaped conveying cavity sleeve 81. Several externally extended receiving cylinders 82 are circumferentially fixedly installed on the outer surface of the conical funnel-shaped conveying cavity sleeve 81, each fixedly connected to a first pre-reserved conveying hole 66. The conical funnel-shaped conveying cavity sleeve 81 is a cylindrical structure with a conical cavity and extending outwards. The extended end of the cylinder is the feeding end of the modular extruder 2, and a discharge hood 83 is fixedly installed at the end of the extended end. The outer edge of the discharge hood 83 is tightly attached to the multi-functional stirring rod 63. The inner wall of the multi-functional stirring rod 63 has a second reserved conveying hole 84 that communicates with the discharge hood 83. The multi-functional impeller strip 13 that communicates with the second reserved conveying hole 84 is fixedly installed on the outer surface of the multi-functional stirring rod 63. The multi-functional stirring head unit 85 is movably installed in the conical opening of the conical funnel-shaped conveying cavity sleeve 81. The multi-functional stirring head unit 85 remixes the masterbatch molten material that enters the conical funnel-shaped conveying cavity sleeve 81 and conveys it to the multi-functional impeller strip 13 through the discharge hood 83 for rotary extrusion.

[0066] The compound mixing module 8 is a core component of the masterbatch plastic mixing unit 6. Through the coordinated design of the conical funnel-shaped conveying chamber sleeve 81, the outer expansion receiving cylinder 82, the discharge hood 83, and the multi-functional stirring head unit 85, it realizes the secondary mixing and precise delivery of the masterbatch molten material. The compound mixing module 8 is integrated into the internal cavity of the multi-functional stirring rod 63. Its conical funnel-shaped conveying chamber sleeve 81 is a cylindrical structure with a conical cavity that extends outward. The conical end of the conical cavity is used to gather and guide the molten material, while the extended end of the cylinder serves as the feeding interface of the modular extruder 2. The discharge hood 83 is fixedly installed at the end. Several externally extended receiving cylinders 82 are circumferentially fixedly installed on the outer surface of the conical funnel-shaped conveying chamber sleeve 81. These externally extended receiving cylinders 82 correspond one-to-one with the first reserved conveying holes 66 opened on the surface of the multi-functional stirring rod 63 and are fixedly connected to form an input channel for the masterbatch molten material to enter the compounding module 8 from the masterbatch heat conveying unit 7. When the masterbatch molten material flows into the externally extended receiving cylinders 82 through the first reserved conveying holes 66, it will enter the conical cavity of the conical funnel-shaped conveying chamber sleeve 81. During this process, the material is accelerated to flow due to the constriction effect of the conical structure, which improves the mixing efficiency. A multi-functional stirring head unit 85 is movably installed in the conical opening of the conical funnel-shaped conveying chamber sleeve 81. This unit includes components such as a cavity stirring head 851 and an arc-shaped liquid guiding cavity strip 852. It is driven to rotate by the drive module 9 to shear and re-stir the flowing masterbatch molten material to ensure uniform pigment dispersion. The mixed material flows through the cylindrical extension of the conical funnel-shaped conveying chamber sleeve 81 to the discharge hood 83. The outer edge of the discharge hood 83 is tightly attached to the inner wall of the multi-functional stirring rod 63, and its outlet communicates with the second reserved conveying hole 84 opened on the surface of the multi-functional stirring rod 63. The second reserved conveying hole 84 is connected to the multi-functional impeller strip 13. Finally, the material is conveyed to the main channel of the modular extruder 2 under the action of rotary extrusion. Through the guidance of the conical cavity and the dynamic remixing of the stirring head, the high uniformity of the masterbatch molten material is achieved. At the same time, the docking of the discharge hood 83 and the second reserved conveying hole 84 ensures the continuity of conveying and avoids the problems of insufficient mixing or color difference caused by the fixed flow channel in traditional equipment. The secondary mixing eliminates the phenomenon of masterbatch aggregation, improves color consistency, and the overall conical structure optimizes the material flow path and reduces energy consumption.

[0067] like Figures 1 to 12As shown, the multifunctional stirring head unit 85 includes a cavity stirring head 851. Several arc-shaped liquid-guiding cavity strips 852 are fixedly connected in a circular pattern on the outer surface of the cavity stirring head 851. The compound mixing module 8 also includes a feeding impeller 86 fixedly connected to the middle position of the side end of the cavity stirring head 851. The feeding impeller 86 extends towards the center position of the discharge hood 83, and a guide plate 87 is fixedly connected at the extended end. A friction sleeve 88 is fitted tightly on the extended cylinder of the conical funnel-shaped conveying cavity sleeve 81. The inner wall of the friction sleeve 88 is provided with a friction coating, and an external gear collar 89 is fixedly connected to the outer surface of the friction sleeve 88. A drive module 9 is also configured on the side of the conical funnel-shaped conveying cavity sleeve 81 opposite to the extended cylinder. The drive module 9 drives the multifunctional stirring head unit 85 to rotate as a whole to perform compound mixing of the masterbatch molten material.

[0068] The multi-functional stirring head unit 85 is the core stirring component of the compound mixing module 8. Through the coordinated design of the cavity stirring head 851, the arc-shaped liquid-guiding cavity strips 852, the conveying impeller 86, and the friction sleeve 88, it achieves shearing and dynamic compound mixing of the masterbatch molten material in the conical funnel-shaped conveying cavity sleeve 81, solving the problem of color difference or poor uniformity caused by insufficient mixing in traditional equipment. The multi-functional stirring head unit 85 is movably installed in the conical opening of the conical funnel-shaped conveying cavity sleeve 81. Several arc-shaped liquid-guiding cavity strips 852 are circumferentially fixedly connected on the outer surface of the cavity stirring head 851. These arc-shaped liquid-guiding cavity strips 852 are spirally arranged along the axial direction of the cavity stirring head 851 to form a flow guiding channel. When the drive module 9 drives the cavity stirring head 851 to rotate, the arc-shaped liquid-guiding cavity strips 852 generate a centrifugal guiding effect on the flowing masterbatch molten material, causing the material to form a vortex in the conical cavity, enhancing the shearing and mixing effect. The compound mixing module 8 also includes a conveying impeller 86 fixedly connected to the middle position of the side end of the cavity mixing head 851. The conveying impeller 86 extends towards the center position of the discharge hood 83, and a guide disk 87 is fixedly connected to its end. During the rotation of the conveying impeller 86, it pushes the mixed material towards the discharge hood 83, and the molten adhesive is carried out to the outside of the disk by the rotation of the guide disk 87, ensuring that the material is discharged evenly. A friction sleeve 88 is fitted tightly around the extended cylinder of the conical funnel-shaped conveying cavity sleeve 81. The inner wall of the friction sleeve 88 is coated with a high coefficient of friction, including but not limited to ceramic or wear-resistant alloy coatings in the prior art. An external gear collar 89 is fixedly connected to its outer surface. When the drive module 9 drives the friction sleeve 88 to rotate through gear transmission, the friction sleeve 88 and the outer wall of the conical funnel-shaped conveying cavity sleeve 81 generate relative motion, forming auxiliary friction heating to prevent the material from condensing on the wall surface. At the same time, the external gear collar 89 meshes with the double-headed gear rod 94 in the drive module 9 to achieve linkage control. The spiral flow of the cavity stirring head 851, the directional pushing of the conveying impeller 86, and the auxiliary heating of the friction sleeve 88 achieve highly uniform mixing of the melt under high temperature and high pressure. Dynamic stirring and frictional heat management are integrated into the conical cavity, which improves mixing efficiency and avoids material retention, and improves pigment dispersion. The synergy between the annular conveying impeller 86 and the guide disk 87 ensures the stability of the discharge, which is especially suitable for the flexible needs of frequent color changes in small batch production.

[0069] like Figures 1 to 12As shown, the drive module 9 includes a first servo motor 91, and a liquid storage module 92 is fixedly installed on the output end of the first servo motor 91. The liquid storage module 92 includes a protective cylinder 921, and two closely fitted semi-circular liquid storage cylinders 922 are fixedly installed inside the protective cylinder 921. Pumps 923 are fixedly installed on the outside of each semi-circular liquid storage cylinder 922 to extract reagents from their respective cylinders in real time. A gear disk 93 is fixedly installed on the outside of the protective cylinder 921. The gear disk 93 is movable. The gear disk 93 is attached to the side wall of the conical funnel-shaped conveying cavity sleeve 81, and the central end of the gear disk 93 passes through the inside of the conical funnel-shaped conveying cavity sleeve 81 and is fixedly connected to the side wall axis of the cavity stirring head 851. The drive module 9 also includes a double-headed gear rod 94 movably installed inside the second conveying outer sleeve 61. One gear head of the double-headed gear rod 94 meshes with the gear disk 93, and the other gear head meshes with the outer gear collar 89, so as to drive the rotation of the cavity stirring head 851 and the friction sleeve 88 through the rotation of the gear disk 93.

[0070] The configured drive module 9 serves as the drive end of the compounding module 8. Through the coordinated design of the first servo motor 91, the liquid storage module 92, the gear disk 93, and the double-headed gear rod 94, it drives and controls the multi-functional stirring head unit 85 and the friction sleeve 88, ensuring efficient compounding of the masterbatch molten material under high temperature and high pressure. The first servo motor 91 serves as the power source, and the speed and direction of the output shaft are controlled by the electronic control system. Its output end is fixedly connected to the protective cylinder 921 of the liquid storage module 92, driving the liquid storage module 92 to rotate as a whole. The liquid storage module 92 includes the protective cylinder 921, inside which two closely fitted semi-circular liquid storage cylinders 922 are fixedly installed. The arc-shaped sides of the two semi-circular liquid storage cylinders 922 fit together to form a complete cylindrical structure, but the internal cavities are isolated from each other, and are used to store different functional reagents, such as high-temperature lubricants and cleaning solvents, to meet the different process requirements when changing colors in small-batch production. Pumps 923 are fixedly installed on the outside of the semi-circular storage cylinders 922. Pumps 923 are plunger pumps equipped with precision metering pumps, as is common in the prior art. They independently control and extract reagents from their respective semi-circular storage cylinders 922 in real time, and then transport them through subsequent pipelines to the cavity stirring head 851 of the multi-functional stirring head unit 85. Lubricant is used to reduce frictional wear during stirring head rotation, and cleaning solvent is used to flush the flow channel and prevent color difference during color changes. A gear disk 93 is fixedly installed on the outside of the protective cylinder 921. The gear disk 93 is movably attached to the side wall of the conical funnel-shaped conveying cavity sleeve 81, and the central end of the gear disk 93 penetrates into the interior of the conical funnel-shaped conveying cavity sleeve 81 and is fixedly connected to the side wall axis of the cavity stirring head 851. The rotation of the gear disk 93 directly drives the cavity stirring head 851 to rotate synchronously, achieving the stirring and shearing function. One gear head of the double-ended gear rod 94 meshes with the gear disk 93, while the other gear head meshes with the external gear collar 89. The external gear collar 89 is fixed to the outer surface of the friction sleeve 88. Through the rotation of the gear disk 93 and the transmission of the double-ended gear rod 94, the friction sleeve 88 is synchronously driven to rotate, causing relative motion between the friction sleeve 88 and the cylindrical outer wall of the conical funnel-shaped conveying cavity sleeve 81, thus forming auxiliary friction heating. Through the centralized drive of the first servo motor 91, the linkage control of the cavity stirring head 851 and the friction sleeve 88 is realized, integrating power transmission and reagent storage into one unit. The meshing transmission of the gear disk 93 and the double-ended gear rod 94 ensures the synchronicity of motion, avoiding the complexity of multi-motor drive in traditional equipment.

[0071] like Figures 1 to 12As shown, the multifunctional stirring head unit 85 further includes a conveying conduit 854 fixedly installed inside the cavity stirring head 851, with a fan-shaped liquid distributor 855 fixedly installed on the conveying conduit 854. The fan-shaped liquid distributor 855 is attached to the inner wall of the cavity stirring head 851. The outer wall of the cavity stirring head 851 has several first one-way valve holes 853 arranged in a circular pattern, each corresponding to a liquid distribution hole of the fan-shaped liquid distributor 855. An annular liquid distributor 856 is fixedly installed on the outer surface of the conveying conduit 854. Several diversion conduits 857 are fixedly connected in a circular pattern on the 56, and each diversion conduit 857 corresponds to a different arc-shaped liquid guiding cavity strip 852 and is connected to the inside of a different arc-shaped liquid guiding cavity strip 852. Several first one-way valve holes 853 are also opened on the side wall of the arc-shaped liquid guiding cavity strip 852. Sealing joints 858 are fixedly installed on the side of the annular liquid dispensing head 856 and the delivery conduit 854, and the sealing joints 858 pass through the center of the gear disk 93 and are connected to the output ends of the two pumps 923 inside the protective cylinder 921.

[0072] The multi-functional stirring head unit 85, with its delivery conduit 854, fan-shaped liquid separator 855, annular liquid separator 856, and diversion conduit 857 working in synergy, achieves high-precision liquid separation and directional delivery of the masterbatch molten material inside the cavity stirring head 851. This ensures that the lubricant and cleaning solvent are evenly distributed in the arc-shaped liquid inlet cavity strip 852, improving mixing efficiency and process stability. The delivery conduit 854 is fixedly installed at the axial position inside the cavity stirring head 851. As a delivery channel, it runs through the entire length of the cavity stirring head 851. The inlet end of the delivery conduit 854 passes through the center of the gear disk 93 via a sealing joint 858 and is connected to the output ends of the two pumps 923 inside the protective cylinder 921, thereby receiving the reagents pumped out from the liquid storage module 92. A fan-shaped dispensing head 855 is fixedly installed on the delivery conduit 854. The fan-shaped dispensing head 855 is attached to the inner wall of the cavity stirring head 851. Its dispensing holes are arranged in a fan shape, corresponding one-to-one with several first one-way valve holes 853 circumferentially opened on the outer wall of the cavity stirring head 851. The first one-way valve holes 853 adopt a one-way valve structure, which only allows the reagent to flow out from the inside of the cavity stirring head 851 to the outside, preventing the molten material from seeping back in and ensuring that the reagent is accurately injected into the stirring area. An annular dispensing head 856 is fixedly installed on the outer surface of the delivery conduit 854. Several diversion conduits 857 are fixedly connected to the annular dispensing head 856 in a circular pattern. Each diversion conduit 857 corresponds to a different arc-shaped liquid-guiding cavity strip 852 and is connected to the interior of a different arc-shaped liquid-guiding cavity strip 852. Several first one-way valve holes 853 are also opened on the side wall of the arc-shaped liquid-guiding cavity strip 852 to form a secondary dispensing channel. Sealing joints 858 are fixedly installed on the side of both the annular dispensing head 856 and the delivery conduit 854, and a sealed connection with the output end of the pump 923 is achieved through the sealing joints 858 to prevent leakage under high pressure. Through the primary distribution of the fan-shaped dispensing head 855 and the secondary diversion of the annular dispensing head 856, the multi-level distribution of reagents is achieved. The centralized delivery and dispersed injection are integrated inside the cavity stirring head 851. The flow direction is controlled by the one-way valve holes, avoiding the problem of uneven distribution or blockage caused by the complex flow channels in traditional equipment.

[0073] like Figures 1 to 12As shown, both ends of the multi-functional stirring rod 63 are open, and a second telescopic rod 10 is fixedly installed on the end near the modular extruder 2. A semi-cylindrical locking block 11 is fixedly installed on the output end of the second telescopic rod 10. A closing unit 12 is configured on the end of the multi-functional stirring rod 63 near the multi-layer co-extrusion die 1. The closing unit 12 includes a magnetic insertion port 121. A magnetic insertion block 122 is magnetically inserted into the magnetic insertion port 121. A second servo motor 123 is fixedly installed on the outside of the magnetic insertion block 122. An outer ring frame 126 is fixedly installed on the outer surface of the second servo motor 123. The outer edge of the sleeve 126 is attached to the annular gap between the multi-functional stirring rod 63 and the second conveying outer sleeve 61. The outer edge of the outer annular sleeve 126 is circumferentially provided with several fourth reserved conveying holes 127. A rotating disk 124 is fixedly installed on the output end of the second servo motor 123. The rotating disk 124 is entirely fitted into the outer annular sleeve 126. Several third reserved conveying holes 125 are also circumferentially provided on the outer edge of the rotating disk 124. The overlapping state of the third reserved conveying holes 125 and the fourth reserved conveying holes 127 controls the closing state of the annular gap between the multi-functional stirring rod 63 and the second conveying outer sleeve 61.

[0074] The configured closed unit 12 is a sealing control component of the color masterbatch plastic mixing unit 6. Through the joint cooperation of the magnetic insertion port 121, the magnetic insertion block 122, the second servo motor 123, the rotating disk 124 and the outer ring frame 126, it realizes the controllable closure of the annular gap between the multi-functional stirring rod 63 and the second conveying outer sleeve 61, ensuring that the molten color masterbatch material is fully stirred in the mixing chamber and preventing leakage.

[0075] The closed unit 12 includes a magnetic insertion port 121 fixedly installed at the end of the multi-functional stirring rod 63. The magnetic insertion port 121 is made of magnetic material, and its inner wall has an annular groove structure for adsorbing and inserting the magnetic insertion block 122. The magnetic insertion block 122 is magnetically adsorbed into the magnetic insertion port 121, forming a detachable sealed connection, which facilitates quick disassembly during maintenance. At the same time, it allows reagents to be added to the semi-circular liquid storage cylinder 922 through the side end of the magnetic insertion block 122, which meets the flexible needs of frequent color changes in small-batch production. A second servo motor 123 is fixedly installed on the outside of the magnetic insertion block 122. The second servo motor 123 serves as a drive source, and the speed and direction of its output shaft are controlled by an electronic control system. The outer edge of the outer annular sleeve 126 is tightly attached to the annular gap between the multi-functional stirring rod 63 and the second conveying outer sleeve 61 to form a sealing ring. The outer ring frame 126 has several fourth reserved conveying holes 127 circumferentially distributed along its outer edge. These holes are used to control the opening and closing of the material flow channel. A rotating disk 124 is fixedly installed on the output end of the second servo motor 123. The rotating disk 124 is fitted into the outer ring frame 126 and can rotate along the axis. Several third reserved conveying holes 125 are also circumferentially distributed on its outer edge. The diameter and distribution of the third reserved conveying holes 125 correspond one-to-one with those of the fourth reserved conveying holes 127. The second servo motor 123 drives the rotating disk 124 to rotate, adjusting the degree of overlap between the third reserved conveying holes 125 and the fourth reserved conveying holes 127, thereby controlling the closing state of the ring gap. When the holes are completely overlapped, the gap is open, allowing the molten material to pass through. When the holes are misaligned, the gap is closed, forming a sealed environment, which prolongs the mixing time of the material in the cavity.

[0076] like Figures 1 to 12 As shown, the multifunctional impeller strip 13 includes a hollow impeller strip 131 that is attached and wound around the outer surface of the multifunctional stirring rod 63. The interior of the hollow impeller strip 131 is hollow, and several second one-way valve holes 132 are sequentially opened along the edge of the wound impeller strip. A connecting conduit 133 is fixedly connected to the side end of the hollow impeller strip 131. The connecting conduit 133 is connected to the discharge hood 83 through the second reserved conveying hole 84. An annular leakage isolation plate 67 is fixedly installed on the convex receiving ring cover 64 at the position of the annular gap between the multifunctional stirring rod 63 and the second conveying outer sleeve 61. Each of the semi-circular liquid storage cylinders 922 is equipped with a replenishment conduit 924 extending from the side end of the multifunctional stirring rod 63.

[0077] The multi-functional impeller strip 13, composed of a hollow impeller strip 131, a second one-way valve hole 132, a connecting conduit 133, and an annular perforated isolation plate 67, enables the rotary extrusion and directional conveying of the molten masterbatch material after compounding. This ensures that the mixed material is uniformly injected into the main channel of the modular extruder 2, solving the problems of uneven mixing or dead zones caused by the fixed impeller structure in traditional equipment. The multi-functional impeller strip 13 includes a hollow impeller strip 131 that is attached and wound around the outer surface of the multi-functional stirring rod 63. The interior of the hollow impeller strip 131 is hollow, and several second one-way valve holes 132 are sequentially opened along the edge of the wound impeller strip. The second one-way valve holes 132 adopt a one-way valve structure, allowing the molten material to be extruded only from the inside of the hollow impeller strip 131 to the outside, preventing the material from flowing back and ensuring precise control of the extrusion direction. A connecting conduit 133 is fixedly connected to the side end of the cavity impeller strip 131. The connecting conduit 133 connects to the discharge hood 83 through the second reserved conveying hole 84, forming a channel for material to be conveyed from the compounding module 8 to the cavity impeller strip 131. An annular leakage isolation plate 67 is fixedly installed on the protruding receiving ring cover 64 at the position of the annular gap between the multi-functional stirring rod 63 and the second conveying outer sleeve 61. The annular leakage isolation plate 67 adopts a perforated plate structure, and its pore diameter matches the second one-way valve hole 132. It is used to isolate incompletely mixed material particles and ensure that only uniform melt enters the extrusion area. Each semi-circular liquid storage cylinder 922 is equipped with a replenishment conduit 924 extending from the side end of the multi-functional stirring rod 63. The replenishment conduit 924 is connected to the cavity of the cavity impeller strip 131 through a sealed connection and is used to replenish lubricant or cleaning solvent when needed. The multi-functional impeller 13 is only located on the outer surface of the multi-functional stirring rod 63 near the modular extruder 2, i.e., the cut-off end docking side. The impeller on the other side of the multi-functional stirring rod 63, i.e., near the multi-layer co-extrusion die head 1, is a solid structure and only serves to rotate and convey materials. It does not participate in material mixing and avoids cross-contamination.

[0078] like Figures 1 to 12 As shown, the transparent granule plastic mixing unit 5 includes a first conveyor sleeve 51. An extrusion screw 52 is movably installed inside the first conveyor sleeve 51. The extrusion screw 52 is the same as the screw in the conveyor barrel of the modular extruder 2. An extension connecting block 53 is also configured on the side of the extrusion screw 52 near the modular extruder 2. The extension connecting block 53 has the same structure as the second telescopic rod 10 and the semi-cylindrical locking block 11.

[0079] The transparent granulated plastic mixing unit 5 is a basic functional unit of the lifting switching module 4. Through the coordinated operation of the first conveyor sleeve 51, the extrusion screw 52, ​​and the extended connecting block 53, it can seamlessly connect with the conveyor barrel of the modular extruder 2 during the switching process, ensuring the continuous conveying of transparent granulated plastic molten material and providing a basic material supply guarantee for small-batch customized production. The transparent granulated plastic mixing unit 5 includes the first conveyor sleeve 51, inside which the extrusion screw 52 is movably installed. The extrusion screw 52 has the same structure as the screw in the conveyor barrel of the modular extruder 2, including the same thread parameters, diameter, and pitch, ensuring the consistency of the molten material conveying characteristics. The extrusion screw 52 is movably installed inside the first conveyor sleeve 51 via a bearing structure, allowing it to rotate along its axis. Its surface is treated with a wear-resistant coating to adapt to long-term operation under high temperature and high pressure environments. An extended connecting block 53 is configured on the side of the extrusion screw 52 near the modular extruder 2. The extended connecting block 53, the second telescopic rod 10, and the semi-cylindrical locking block 11 form a standardized interface. The extended connecting block 53 is made of high-strength alloy steel, and its end face is provided with a positioning pin hole and a sealing groove. The pin is matched with the corresponding hole at the cut end of the modular extruder 2 to achieve precise alignment. The sealing groove is embedded with a high-temperature resistant sealing ring to ensure the sealing of the connection.

[0080] The usage method provided by this invention is as follows:

[0081] In use, this invention begins with the transparent granule plastic mixing unit 5, connected to the cut-off end of the conveyor barrel of the modular extruder 2 via a lifting switching module 4, based on the initial operating state of the modular extruder 2. At this time, the extrusion screw 52 inside the first conveyor sleeve 51 rotates at the same speed as the original screw in the modular extruder 2, melting the transparent masterbatch conveyed by the transparent masterbatch feed cylinder 3 and continuously pushing it towards the multi-layer co-extrusion die 1. During this process, the extended connecting block 53 engages with the semi-cylindrical locking block 11 through the push of the second telescopic rod 10, ensuring a sealed connection between the first conveyor sleeve 51 and the cut-off end of the modular extruder 2, maintaining the continuity of the molten material flow. This stage only conveys transparent granule plastic molten material, providing a basic structural layer for multi-layer co-extrusion and avoiding the color-changing shutdown problem caused by fixed flow channels in traditional equipment.

[0082] Then, when production demand switches to customized colors, the lifting switching module 4 initiates the switching process. The first telescopic rod 45 retracts, causing the second U-shaped fixing frame 44 to move downwards, allowing the sealing clamp 43 to slide axially along the double-layer sealing sleeve head 41, connecting the color masterbatch plastic mixing unit 6 to the cut-off end of the modular extruder 2. The color masterbatch hot conveying unit 7 starts simultaneously, injecting molten color masterbatch material into the interior of the second conveying outer sleeve 61 through the guide outer protrusion ring 62. The outer protruding receiving ring cover 64 forms a sealed channel with the guide outer protrusion ring 62 through the sealing protrusion ring 65, and the molten color masterbatch material enters the compounding module 8 through the first reserved conveying hole 66. At the same time, the transparent granular plastic molten material originally conveyed in the modular extruder 2 continues to flow into the second conveying outer sleeve 61, initially mixing with the color masterbatch material. The partitioned design avoids cross-contamination of materials.

[0083] Next, the compounding module 8 efficiently re-stirs the mixed materials. The first servo motor 91 of the drive module 9 drives the cavity stirring head 851 to rotate via the gear disk 93. The arc-shaped liquid-guiding cavity strip 852 generates centrifugal shearing action on the material flowing into the conical funnel-shaped conveying cavity sleeve 81. At the same time, the double-headed gear rod 94 meshes with the external gear collar 89, causing relative friction between the friction sleeve 88 and the cylindrical outer wall of the conical funnel-shaped conveying cavity sleeve 81, which assists in heating to prevent material condensation. The mixed material is conveyed through the discharge hood 83 and the second reserved conveying hole 84 to the multi-functional impeller strip 13. The cavity impeller strip 131 is directionally extruded through the second one-way valve hole 132 to ensure that the masterbatch is uniformly dispersed in the transparent substrate. During this process, the semi-circular liquid storage cylinder 922 of the liquid storage module 92 is replenished with lubricant in real time by the pump 923, and injected into the cavity stirring head 851 through the conveying conduit 854 and the fan-shaped liquid distributor 855 to further optimize the mixing uniformity.

[0084] Finally, after completing the customized production, the system switches back to the transparent granule conveying state. The first telescopic rod 45 extends, pushing the color masterbatch plastic mixing unit 6 away from the cut-off end. The transparent granule plastic mixing unit 5 reconnects. The magnetic insertion block 122 of the closed unit 12 seals the side end of the multi-functional stirring rod 63 through the magnetic insertion port 121. The second servo motor 123 drives the rotating disk 124 to rotate. The overlap of the third reserved conveying hole 125 and the fourth reserved conveying hole 127 controls the closing of the ring gap to prevent residual color masterbatch contamination.

[0085] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-functional multi-layer co-extrusion extrusion device, comprising a multi-layer co-extrusion die (1) and several sets of modular extruders (2), each set of modular extruders (2) being equipped with a transparent masterbatch feed cylinder (3), and the conveyor cylinders for molten material on the modular extruders (2) being connected to the input end of the multi-layer co-extrusion die (1) for multi-layer co-extrusion, characterized in that: The conveyor barrel of each modular extruder (2) is cut off on the side near the multi-layer co-extrusion die (1), and a lifting switching module (4) is provided on the cut-off end. The lifting switching module (4) integrates a transparent granule plastic mixing unit (5) and a color masterbatch plastic mixing unit (6). The transparent granule plastic mixing unit (5) and the color masterbatch plastic mixing unit (6) are both configured as barrel structures corresponding to the conveyor barrel structure of the modular extruder (2). The color masterbatch plastic mixing unit (6) is additionally equipped with a color masterbatch heat transfer unit (7) for storing and melting color masterbatch. When the transparent granule plastic mixing unit (5) is connected to the modular extruder (2), it continues to transport transparent granule plastic melt material. When the color masterbatch plastic mixing unit (6) is connected to the modular extruder (2), it mixes the color masterbatch melt material with the transparent granule plastic melt material originally transported in the modular extruder (2) to achieve rapid color change co-extrusion in small-batch customized production.

2. The multi-functional multi-layer co-extrusion extrusion equipment according to claim 1, characterized in that, The lifting switching module (4) includes a double-layer sealing sleeve head (41) fixedly connected to both ends of the cut-off end of the conveyor barrel of each modular extruder (2), and a first U-shaped fixing frame (42) is fixedly connected between the two double-layer sealing sleeve heads (41) to maintain the parallel positioning of the two sides of the cut-off end. A sealing clamp (43) is slidably sealed on each double-layer sealing sleeve head (41), and a second U-shaped fixing frame (44) is connected to the side of the sealing clamp (43) on both sides. A first telescopic rod (45) is fixedly installed on the axial end of the U-shaped fixing frame (44). The telescopic end of the first telescopic rod (45) is used to drive the second U-shaped fixing frame (44) to reciprocate in the vertical direction. The color masterbatch plastic mixing unit (6) and transparent granule plastic mixing unit (5) are assembled one above the other in the middle of the two sealing clamps (43). The reciprocating translation of the second U-shaped fixing frame (44) is used to control the color masterbatch plastic mixing unit (6) and transparent granule plastic mixing unit (5) to dock with the cut-off end of the conveyor barrel of the modular extruder (2).

3. The multi-functional multi-layer co-extrusion extrusion equipment according to claim 2, characterized in that, The masterbatch plastic mixing unit (6) includes a second conveyor sleeve (61). A guide ring (62) is fixedly installed at the middle position of the outer surface of the second conveyor sleeve (61). A masterbatch heat transfer unit (7) is assembled and connected to the top of the guide ring (62). A multi-functional stirring rod (63) is movably installed inside the second conveyor sleeve (61). A convex receiving ring cover (64) communicating with the guide ring (62) is fixedly installed at the middle position of the outer surface of the multi-functional stirring rod (63). A sealing ring (65) is fixedly installed on the outer edge sidewall of the circular cover (64) and sealed inside the material guide ring (62). The interior of the multi-functional stirring rod (63) is hollow, and a compound mixing module (8) is arranged in the middle of the cavity. Several first reserved conveying holes (66) connected to the outer convex receiving circular cover (64) are arranged in a circular shape in the middle of the interior of the multi-functional stirring rod (63) so as to convey the molten color masterbatch material in the color masterbatch heat conveying unit (7) to the compound mixing module (8) through the first reserved conveying holes (66).

4. The multi-functional multi-layer co-extrusion extrusion equipment according to claim 3, characterized in that, The compound mixing module (8) includes a conical funnel-shaped conveying cavity sleeve (81). Several externally extended receiving cylinders (82) are fixedly installed circumferentially on the outer surface of the conical funnel-shaped conveying cavity sleeve (81), each fixedly connected to a first pre-reserved conveying hole (66). The conical funnel-shaped conveying cavity sleeve (81) is a cylindrical structure with a conical cavity and extending outwards. The extended end of the cylinder is the feeding end of the modular extruder (2), and a discharge hood (83) is fixedly installed at the end of the extended end. The outer edge of the discharge hood (83) is tightly attached to the inner wall of the multi-functional stirring rod (63). A second reserved conveying hole (84) communicating with the discharge hood (83) is provided on the surface of the multi-functional stirring rod (63), and a multi-functional impeller strip (13) communicating with the second reserved conveying hole (84) is fixedly installed on the outer surface of the multi-functional stirring rod (63). A multi-functional stirring head unit (85) is movably installed in the conical opening of the conical funnel-shaped conveying cavity sleeve (81). The multi-functional stirring head unit (85) remixes the masterbatch melt material entering the conical funnel-shaped conveying cavity sleeve (81) and conveys it to the multi-functional impeller strip (13) through the discharge hood (83) for rotary extrusion.

5. A multi-functional multi-layer co-extrusion extrusion device according to claim 4, characterized in that, The multifunctional stirring head unit (85) includes a cavity stirring head (851), on the outer surface of which several arc-shaped liquid-guiding cavity strips (852) are fixedly connected in a circular pattern. The compound mixing module (8) also includes a conveying impeller (86) fixedly connected to the middle position of the side end of the cavity stirring head (851). The conveying impeller (86) extends as a whole toward the center position of the discharge hood (83), and a guide plate (87) is fixedly connected at the extended end. A friction sleeve (88) is fitted tightly on the extended cylinder of the funnel-shaped conveying cavity sleeve (81). The inner wall of the friction sleeve (88) is provided with a friction coating, and an external gear collar (89) is fixedly connected to the outer surface of the friction sleeve (88). A drive module (9) is also provided on the side of the funnel-shaped conveying cavity sleeve (81) opposite to the extended cylinder. The drive module (9) drives the multi-functional stirring head unit (85) to rotate as a whole to perform re-stirring of the masterbatch molten material.

6. A multi-functional multi-layer co-extrusion extrusion device according to claim 5, characterized in that, The drive module (9) includes a first servo motor (91), and a liquid storage module (92) is fixedly installed on the output end of the first servo motor (91). The liquid storage module (92) includes a protective cylinder (921). Two closely fitted semi-circular liquid storage cylinders (922) are fixedly installed inside the protective cylinder (921). Pumps (923) are fixedly installed on the outside of the semi-circular liquid storage cylinders (922) respectively to extract the reagents in their respective semi-circular liquid storage cylinders (922) in real time. A gear disk (93) is fixedly installed on the outside of the protective cylinder (921). The gear disk (93) is movably attached to... On the side wall of the conical funnel-shaped conveying cavity sleeve (81), and the center end of the gear disk (93) passes through the inside of the conical funnel-shaped conveying cavity sleeve (81) and is fixedly connected to the side wall axis of the cavity stirring head (851), the drive module (9) also includes a double-headed gear rod (94) movably installed inside the second conveying outer sleeve (61). One side of the double-headed gear rod (94) meshes with the gear disk (93), and the other side of the gear head meshes with the outer gear collar (89), so as to drive the rotation of the cavity stirring head (851) and the friction sleeve (88) through the rotation of the gear disk (93).

7. A multi-functional multi-layer co-extrusion extrusion device according to claim 6, characterized in that, The multifunctional stirring head unit (85) further includes a conveying conduit (854) with a central axis fixedly installed inside the cavity stirring head (851). A fan-shaped liquid separator (855) is fixedly installed on the conveying conduit (854). The fan-shaped liquid separator (855) is attached to the inner wall of the cavity stirring head (851). The outer wall of the cavity stirring head (851) has several first one-way valve holes (853) that correspond one-to-one with the liquid separator holes of the fan-shaped liquid separator (855). An annular liquid separator (856) is fixedly installed on the outer surface of the conveying conduit (854). The annular liquid separator (856) and the delivery conduit (854) are fixedly connected in a circular pattern with several diversion conduits (857), and each diversion conduit (857) corresponds to a different arc-shaped liquid guiding cavity strip (852) and is connected to the inside of a different arc-shaped liquid guiding cavity strip (852). Several first one-way valve holes (853) are also opened on the side wall of the arc-shaped liquid guiding cavity strip (852). Sealing joints (858) are fixedly installed on the side of the annular liquid separator (856) and the delivery conduit (854), and are connected to the output end of the two pumps (923) inside the protective cylinder (921) through the center of the gear disk (93) via the sealing joints (858).

8. A multi-functional multi-layer co-extrusion extrusion device according to claim 7, characterized in that, Both ends of the multi-functional stirring rod (63) are open, and a second telescopic rod (10) is fixedly installed on the end near the modular extruder (2). A semi-cylindrical clamping block (11) is fixedly installed on the output end of the second telescopic rod (10). A closing unit (12) is configured on the end of the multi-functional stirring rod (63) near the multi-layer co-extrusion die (1). The closing unit (12) includes a magnetic insertion port (121). A magnetic insertion block (122) is installed on the magnetic insertion port (121). A second servo motor (123) is fixedly installed on the outside of the magnetic insertion block (122). An outer ring frame (126) is fixedly installed on the outer surface of the second servo motor (123). The outer edge of the sleeve (126) is attached to the annular gap between the multi-functional stirring rod (63) and the second conveying outer sleeve (61), and the outer edge of the outer annular sleeve (126) is provided with several fourth reserved conveying holes (127) in a circular pattern. A rotating disk (124) is fixedly installed on the output end of the second servo motor (123). The rotating disk (124) is fitted into the outer annular sleeve (126), and several third reserved conveying holes (125) are also provided in a circular pattern on the outer edge of the rotating disk (124). The overlapping state of the third reserved conveying holes (125) and the fourth reserved conveying holes (127) controls the closing state of the annular gap between the multi-functional stirring rod (63) and the second conveying outer sleeve (61).

9. A multi-functional multi-layer co-extrusion extrusion device according to claim 8, characterized in that, The multi-functional impeller strip (13) includes a hollow impeller strip (131) that is attached and wound around the outer surface of the multi-functional stirring rod (63). The interior of the hollow impeller strip (131) is hollow, and several second one-way valve holes (132) are sequentially opened along the edge of the wound impeller strip. A connecting conduit (133) is fixedly connected to the side end of the hollow impeller strip (131). The connecting conduit (133) is connected to the discharge hood (83) through the second reserved conveying hole (84). An annular leakage isolation plate (67) is fixedly installed on the convex receiving ring cover (64) at the position of the annular gap between the multi-functional stirring rod (63) and the second conveying outer sleeve (61). Each of the semi-circular liquid storage cylinders (922) is equipped with a replenishing conduit (924) extending from the side end of the multi-functional stirring rod (63).

10. A multi-functional multi-layer co-extrusion extrusion device according to claim 9, characterized in that, The transparent granulated plastic mixing unit (5) includes a first conveyor sleeve (51), and an extrusion screw (52) is movably installed inside the first conveyor sleeve (51). The extrusion screw (52) is the same as the screw in the conveyor barrel of the modular extruder (2), and an extension connecting block (53) is also configured on the side of the extrusion screw (52) near the modular extruder (2). The extension connecting block (53) has the same structure as the second telescopic rod (10) and the semi-cylindrical locking block (11).

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