Composite multilayer stable board extrusion equipment and its extrusion method

Abstract

The application discloses a kind of composite multilayer stable board extrusion equipment and its extrusion method, it is related to composite board production processing field, including first extruder and second extruder, first extruder and second extruder respectively extrude two melt for producing composite multilayer stable board, plate machine is used to flatten melt and form preliminary slab, extrusion die one end is connected with first extruder, and other end is connected with plate machine, and the side of extrusion die is connected with second extruder by the movable connector of curved state, for guiding two kinds of melt to plate machine after being compounded according to set proportion.The extrusion die of multilayer structure combination designed in the application is combined into five-layer composite board structure from inside to outside in order, middle layer, two interlayers, two outermost layers, improve the nail holding force of board, since the separation structure in extrusion die is arranged symmetrically with middle layer as reference, so that two interlayers and two outermost layers are evenly stressed in flow process, effectively improve material fusion quality.

Description

Technical Field

[0001] This invention relates to the field of composite board production and processing, specifically to a composite multilayer stabilized board extrusion equipment and its extrusion method. Background Technology

[0002] Extrusion-processed multilayer composite board technology is an advanced board manufacturing technology designed to overcome the performance limitations of traditional single-layer boards. It combines materials with different properties into an integrated multilayer structure in a molten state, thereby achieving performance optimization and functional integration.

[0003] Chinese Patent Announcement No. CN119427694B discloses a sheet extrusion equipment and its usage method, including a sheet extrusion and compositing head, multiple feeding ends located on one side of the sheet extrusion and compositing head, and multiple thermoplastic extruders connected to each feeding end of the sheet extrusion and compositing head. The sheet extrusion and compositing head includes a front material discharge platform and a rear connecting block that are locked together. Each feeding end is located behind the rear connecting block. A sheet discharge groove is opened at the front end of the front material discharge platform. Multiple interconnected conical pressure ports and horizontal plate cavities are opened on the inner side of the front material discharge platform. The conical pressure ports are connected to the feeding ends, while the horizontal plate cavities are connected to one side of the sheet discharge groove. A cooler is installed on the upper side of the front material discharge platform, and the cooler is located adjacent to the upper side of the sheet discharge groove.

[0004] Existing sheet extrusion equipment utilizes multi-layer chambers to guide and pressurize the material in layers, enabling the melt layers to fuse and be extruded under high temperature and pressure. However, in actual operation, the multi-layer chamber structure is prone to fluctuations in interlayer bonding strength due to uneven temperature gradients. The melt flow paths are also relatively long, which can easily create dead zones, affecting the stability of material properties and thus reducing the overall mechanical properties and dimensional accuracy of the composite board.

[0005] In summary, existing multilayer composite board extrusion equipment is prone to causing weak interlayer bonding and poor thickness uniformity when producing multilayer composite boards. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a composite multilayer stable board extrusion equipment and extrusion method to solve the technical problems that existing multilayer composite board extrusion equipment easily leads to weak interlayer structure bonding and poor thickness uniformity when producing multilayer composite boards.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a composite multilayer stabilized board extrusion equipment, comprising a first extruder and a second extruder, wherein the first extruder and the second extruder respectively extrude two melts for producing composite multilayer stabilized boards, and further comprising a board extruder for flattening the melts and forming preliminary slabs, and further comprising an extrusion die, wherein one end of the extrusion die is connected to the first extruder and the other end is connected to the board extruder, and one side of the extrusion die is connected to the second extruder through a bent movable connector for guiding the two melts to the board extruder after being compounded in a set ratio.

[0008] By adopting the above technical solution, an extrusion die composed of multiple layers is designed. The partition structure within each extrusion die guides the melt extruded by the two extruders, forming a five-layer composite sheet structure from the inside out, consisting of an intermediate layer, two sandwich layers, and two outermost layers. This improves the nail-holding power of the sheet. Furthermore, because the partition structure within the extrusion die is symmetrically arranged with the intermediate layer as the reference, the two sandwich layers and the two outermost layers are subjected to uniform stress and symmetrical temperature distribution during flow, effectively reducing warping deformation caused by uneven thermal stress. At the same time, it shortens the melt flow path, avoids dead corners, and effectively improves the material fusion quality.

[0009] The present invention is further configured such that the extrusion die is provided with a connecting plate, a first template, a second template, a third template, a fourth template, and a fifth template in sequence from the first extruder toward the plate extruder. The second template and the third template are respectively provided with a first combined inlet and a second combined inlet on their sides. The first combined inlet and the second combined inlet can be combined to form a complete connection port for connecting to the second extruder.

[0010] Preferably, the multi-layered extrusion die ensures uniform stratification of the melt flowing from the two extrusion lines.

[0011] The invention is further configured such that the connecting disc is coaxially provided with a first melt inlet, and the first template is provided with a matching first template inlet facing the direction of the first melt inlet. The melt entering the first template is diverted by the diversion structure inside the first template and flows out from two first diversion ports symmetrically provided at the other end of the first template. The second template is provided with a first converging groove corresponding to the two first diversion ports. A second template through-hole is provided through the center of the second template. A first combined piece with a semi-arc cross-section is provided at the end of the second template through-hole near the third template. A first semi-circular groove and a second semi-circular groove that can form two complete cylindrical channels are respectively provided between the second template and the third template. The channels are symmetrically arranged in a Y-shape and all connect to the second extruder. The third template has a third template opening at its center. Two second combined plates are arranged parallel to each other inside the third template opening to cooperate with the first combined plate. The first and second combined plates are also connected to the second extruder. The end of the second semi-circular groove is provided with an outermost melt outlet that penetrates the third template. The fourth template has a fourth template opening at its center that matches the third template opening, and second confluence grooves are provided on both sides to guide the melt flowing out of the outermost melt outlet. The fifth template has a fifth template inlet at one end facing the fourth template that cooperates with the fourth template opening, and a melt outlet at the other end of the fifth template for connection to the plate extruder.

[0012] Preferably, the melt extruded from the two extrusion lines is uniformly layered into five mutually symmetrical layers.

[0013] The present invention is further configured such that a support plate is connected between the inner wall of the third template opening and the second assembly piece, the end of the support plate near the second template is flush with the end face of the third template, and its length is less than the thickness of the third template.

[0014] Preferably, the support plate can effectively prevent the second assembly piece from deforming.

[0015] The present invention is further configured such that the first melt inlet of the connecting plate and the first template inlet of the first template have a continuous conical structure, and the first melt inlet is fitted with a positioning tube. The outer wall of the positioning tube is conical and can fit against the conical surfaces of the first melt inlet and the first template inlet. When the end face of the positioning tube is flush with the connecting plate, the outer wall of the positioning tube fits against the conical surfaces of the first melt inlet and the first template inlet.

[0016] Preferably, the use of a positioning insert can ensure that the connecting plate and the first template can be quickly and coaxially connected when installing the connecting plate.

[0017] The present invention is further configured such that, apart from the connecting plate, each layer of the extrusion mold is provided with two corresponding positioning holes, the two positioning holes are arranged circumferentially at a distance of 180 degrees, a positioning post is inserted into the positioning hole, and the positioning holes between adjacent layers of the mold are staggered.

[0018] Preferably, the positioning holes and positioning pins between the layers of the extrusion die enable convenient positioning and connection of the template layers.

[0019] The present invention is further configured such that a connecting cylinder is connected to the melt output end of the second extruder, and a piston structure is provided at the end of the connecting cylinder away from the second extruder. The inner wall of the movable connecting head cooperates with the piston structure of the second extruder, and the movable connecting head can slide along the axial direction of the connecting cylinder.

[0020] Preferably, this facilitates the positioning and installation of the second extruder, allowing the melt output from the second extruder to stably enter the extrusion die.

[0021] The present invention is further configured such that the other end of the movable connector is used to connect to the connecting column, and a pad is placed between the connector and the connecting column; the other end of the connecting column is used to connect to the extrusion die.

[0022] Preferably, the gasket can further prevent leakage between the connecting post and the movable connector.

[0023] The present invention is further configured such that a blocking strip is provided at one end of the second template opening of the second template near the first template, and the width of the blocking strip is the same as that of the first assembly piece.

[0024] Preferably, the blocking strip can effectively reduce the impact of the melt on the first assembled sheet, thereby preventing the first assembled sheet from deforming.

[0025] A method for extruding composite multilayer stabilized plates, the process comprising the following steps:

[0026] Step 1: Install and adjust the first extruder, the second extruder, and the platen extruder so that their shafts are at the same height and the melt outlet of the first extruder is coaxial with the melt inlet of the platen extruder.

[0027] Step 2: Hoist the extrusion die between the first extruder and the platen extruder, connect the connecting cylinder to the melt outlet end of the second extruder, slide and adjust the movable connecting head to make the melt outlet end of the movable connecting head coaxial with the melt inlet end on the side of the extrusion die, and place a shim of appropriate thickness according to the distance between the end face of the movable connecting head and the end face of the connecting column at this time, and then connect the connecting column and the movable connecting head.

[0028] Step 3: The first extruder and the second extruder simultaneously output two different melts, which enter the extrusion die to form a five-layer composite structure. Finally, the melt flows into the plate extruder to be extruded into a slab, and then undergoes subsequent processes to finally form a plate.

[0029] In summary, the present invention has the following main beneficial effects:

[0030] 1. This invention designs an extrusion die composed of multiple layers. The partition structure within each extrusion die guides the melt extruded from two extruders, forming a five-layer composite sheet structure consisting of an inner layer, two sandwich layers, and two outermost layers from the inside out. This improves the nail-holding power of the sheet. Furthermore, because the partition structure within the extrusion die is symmetrically arranged with the inner layer as the reference, the two sandwich layers and the two outermost layers experience uniform stress and symmetrical temperature distribution during flow, effectively reducing warping deformation caused by uneven thermal stress. At the same time, it shortens the melt flow path, avoids dead zones, and effectively improves the material fusion quality.

[0031] 2. By tilting the movable connector on one side of the extrusion die, the present invention can bring the two extrusion lines as close as possible while ensuring a stable connection between the extrusion die and the extruder. This effectively shortens the overall width of the composite board extrusion equipment, facilitates the layout and installation of the equipment in a limited space, reduces the floor space of the production line, and improves the utilization rate of workshop space.

[0032] 3. By setting a positioning insert at the port of the extrusion die, the conical positioning insert is inserted and fitted between the connecting plate and the first template, which effectively ensures the coaxiality and connection stability between the connecting plate and the first template, avoids uneven melt distribution or leakage due to assembly deviation, further improves the interlayer bonding strength and thickness consistency of the composite plate, and ensures high precision and high reliability in the continuous production process.

[0033] 4. By symmetrically setting support plates on both sides of the second composite sheet within the third template, the present invention effectively enhances the structural rigidity and deformation resistance of the second composite sheet under the impact of high-pressure melt, preventing template cracking or interlayer misalignment caused by localized stress concentration. At the same time, the support plates are integrally formed with the third template, improving the overall assembly accuracy and sealing performance, ensuring that the five layers of melt maintain a stable flow state during the convergence process, and further optimizing the uniformity of sheet thickness and surface flatness. Attached Figure Description

[0034] Figure 1 This is a perspective view of the extruder, extrusion die, and sheet extruder of the present invention;

[0035] Figure 2 This is a perspective view of the extruder, extrusion die, and platen feeder from another angle of the present invention.

[0036] Figure 3 This is a perspective view of the extrusion die of the present invention;

[0037] Figure 4 This is a perspective view of the extrusion die from another angle.

[0038] Figure 5 This is a perspective view of the connecting cylinder and the movable connecting head of the present invention;

[0039] Figure 6 This is a schematic diagram of the internal structure of the movable connector of the present invention;

[0040] Figure 7 This is an exploded view of the extrusion die of the present invention;

[0041] Figure 8 This is an exploded view of the extrusion die from another perspective of the present invention;

[0042] Figure 9 This is a perspective view of the connecting disc and positioning insert of the present invention;

[0043] Figure 10 This is a cross-sectional view of the first template of the present invention;

[0044] Figure 11 This is a perspective view of the second template of the present invention;

[0045] Figure 12 This is a perspective view of the second template of the present invention.

[0046] Figure 13 This is a perspective view of the third template of the present invention;

[0047] Figure 14 This is a third perspective view of the template from another angle of the present invention;

[0048] Figure 15 This is a perspective view of the fourth template of the present invention;

[0049] Figure 16 This is a perspective view of the fourth template of the present invention;

[0050] Figure 17 This is a perspective view of the fifth template of the present invention;

[0051] Figure 18 This is a perspective view of the fifth template from another angle of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. First extruder; 2. Second extruder; 3. Plate extruder; 4. Extrusion die; 401. Connecting plate; 40101. First melt inlet; 402. First die; 40201. First die inlet; 40202. First branch outlet; 403. Second die; 40301. First confluence groove; 40302. Blocking strip; 40303. Second die outlet; 40304. First assembly plate; 40305. First assembly inlet; 40306. First semi-circular groove; 404. Third die; 40401. Third die outlet; 40402. 40403, Second composite plate; 40404, Support plate; 40405, Second composite inlet; 40406, Second semi-circular groove; 40407, Outermost melt outlet; 405, Fourth template; 40501, Second confluence groove; 40502, Fourth template outlet; 406, Fifth template; 40601, Fifth template inlet; 40602, Melt outlet; 407, Second melt inlet; 5, Positioning insert; 6, Connecting cylinder; 7, Movable connector; 8, Pad; 9, Positioning post; 10, Positioning hole; 11, Connecting post. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0055] The embodiments of the present invention will now be described.

[0056] First embodiment:

[0057] Please refer to the extrusion equipment for composite multilayer stabilized boards. Figures 1-18 It includes a first extruder 1 and a second extruder 2. The first extruder 1 and the second extruder 2 respectively extrude two melts for producing composite multilayer stabilized plates. The two melts enter from the end face and the side face of the extrusion die 4 respectively, forming a five-layer composite structure in the extrusion die 4.

[0058] It also includes a plate-out machine 3, which is used to flatten the melt and form a preliminary slab, and output the finished composite multilayer stable board after cooling and shaping.

[0059] It also includes an extrusion die 4, one end of which is connected to the first extruder 1 and the other end is connected to the plate extruder 3. One side of the extrusion die 4 is connected to the second extruder 2 through a bent movable connector 7, which is used to guide the two melts to the plate extruder 3 after they are compounded in a set ratio.

[0060] Specifically, the extrusion die 4 is provided with a connecting plate 401, a first template 402, a second template 403, a third template 404, a fourth template 405, and a fifth template 406 in sequence from the first extruder 1 toward the platen 3. The second template 403 and the third template 404 are respectively provided with a first combined inlet 40305 and a second combined inlet 40405. The first combined inlet 40305 and the second combined inlet 40405 can be combined to form a complete second melt inlet 407 for connecting the second extruder 2. The multi-layer structure of the extrusion die 4 ensures that the melt flowing out from the two extrusion lines is evenly layered.

[0061] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-18 The connecting plate 401 is coaxially provided with a first melt inlet 40101, and the first template 402 is provided with a matching first template inlet 40201 facing the first melt inlet 40101. The melt entering the first template 402 is diverted by the diversion structure inside the first template 402 and flows out from two first diversion ports 40202 symmetrically provided at the other end of the first template 402. Specifically, the sum of the cross-sectional areas of the two first diversion ports 40202 is equal to the first template inlet 40201, which can uniformly guide the melt into the second template 403.

[0062] Furthermore, the second template 403 is provided with a first confluence groove 40301 corresponding to the two first diversion ports 40202. A second template opening 40303 is provided through the center of the second template 403. The cross-section of the second template opening 40303 is rectangular. A first combined piece 40304 with a semi-arc cross-section is provided at the end of the second template opening 40303 near the third template 404. A first semi-circular groove 40306 and a second semi-circular groove 40406 that can form two complete cylindrical channels are respectively provided between the second template 403 and the third template 404. The complete cylindrical channels are symmetrical and Y-shaped, and all are connected to the second extruder 2. The third template 404 has a third template opening 40401 at its center. Two second combined pieces 40403 are arranged in parallel inside the third template opening 40401 to cooperate with the first combined piece 40304. An intermediate melt opening 40402 is formed between the two second combined pieces 40403 to allow melt from the second extruder 2 to pass through. The first combined piece 40304 and the second combined piece 40403 are also connected to the second extruder 2. The end of the second semi-circular groove 40406 is provided with an outermost melt opening 40407 that penetrates the third template 404.

[0063] Furthermore, the fourth template 405 has a fourth template opening 40502 at its center that matches the third template opening 40401, and second confluence grooves 40501 on both sides to guide the melt flowing out of the outermost melt opening 40407. Specifically, the width of the fourth template opening 40502 is greater than that of the third template opening 40401 to ensure that the outermost melt can flow smoothly. The fifth template 406 has a fifth template inlet 40601 at one end of its center facing the fourth template 405, which matches the fourth template opening 40502. The other end of the fifth template 406 has a melt outlet 40602 for connecting to the extruder 3. The cross-section of the melt outlet 40602 is circular and matches the extruder 3, so that the melt extruded by the two extrusion lines is evenly layered into five mutually symmetrical layers.

[0064] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-6 The melt output end of the second extruder 2 is connected to a connecting cylinder 6. A piston structure is provided at the end of the connecting cylinder 6 away from the second extruder 2. The inner wall of the movable connecting head 7 is matched with the piston structure of the second extruder 2. The movable connecting head 7 can slide along the axis of the connecting cylinder 6, which facilitates the positioning and installation of the second extruder 2 and allows the melt output from the second extruder 2 to enter the extrusion die 4 stably.

[0065] Specifically, the other end of the movable connector 7 is used to connect to the connecting post 11, and a gasket 8 is placed between the movable connector 7 and the connecting post 11. The gasket 8 is made of rubber, and the thickness of the gasket 8 is reasonably selected according to the distance between the end face of the movable connector 7 and the end face of the connecting post 11. If necessary, multiple gaskets 8 can be stacked. When the bolts between the connecting post 11 and the movable connector 7 are tightened, the gasket 8 can be compressed, thereby ensuring the sealing between the movable connector 7 and the connecting post 11. The other end of the connecting post 11 is used to connect to the extrusion mold 4, specifically to the second melt inlet 407 of the extrusion mold 4. The gasket 8 can further prevent leakage between the connecting post 11 and the movable connector 7.

[0066] Second embodiment:

[0067] Please refer to the extrusion equipment for composite multilayer stabilized boards. Figures 1-18 Based on the first embodiment, the difference from the first embodiment is that a support plate 40404 is connected between the inner wall of the third template 404 through 40401 and the second combined piece 40403. The end of the support plate 40404 near the second template 403 is flush with the end face of the third template 404, and its length is less than the thickness of the third template 404. The support plate 40404 can effectively prevent the second combined piece 40403 from deforming or shifting, and ensure the geometric accuracy and stability of the melt channel.

[0068] For details regarding the above embodiments, please refer to [link / reference]. Figures 7-10 The first melt inlet 40101 of the connecting plate 401 and the first template inlet 40201 of the first template 402 have a continuous conical structure. The first melt inlet 40101 is fitted with a positioning tube 5. The outer wall of the positioning tube 5 is conical and can fit the conical surfaces of the first melt inlet 40101 and the first template inlet 40201. When the end face of the positioning tube 5 is flush with the connecting plate 401, the outer wall of the positioning tube 5 fits the conical surfaces of the first melt inlet 40101 and the first template inlet 40201. The positioning tube 5 can ensure that the connecting plate 401 and the first template 402 can be quickly coaxially connected when the connecting plate 401 is installed, while ensuring the continuity and sealing of the melt channel, effectively preventing the melt from being stuck or leaking during the transmission process.

[0069] Furthermore, each layer of the extrusion die 4, except for the connecting plate 401, is provided with two corresponding positioning holes 10. The two positioning holes 10 are set at 180 degrees apart in the circumferential direction. A positioning post 9 is inserted into the positioning hole 10. The positioning holes 10 between adjacent layers of the template are staggered. The structure of positioning holes 10 and positioning posts 9 between each layer of the extrusion die 4 can conveniently realize the positioning and connection of each layer of template.

[0070] Furthermore, a blocking strip 40302 is provided at one end of the second template opening 40303 of the second template 403 near the first template 402. The width of the blocking strip 40302 is the same as that of the first assembled piece 40304, and its projection toward the first assembled piece 40304 can cover the first assembled piece 40304. The blocking strip 40302 can effectively reduce the impact of the melt on the first assembled piece 40304, thereby preventing the first assembled piece 40304 from deforming.

[0071] A method for extruding composite multilayer stabilized plates, the process comprising the following steps:

[0072] Step 1: Install and adjust the first extruder 1, the second extruder 2, and the plate extruder 3 so that the shafts of the three are on the same horizontal line, and ensure that the connection between each piece of equipment is firm and well sealed. The melt outlet of the first extruder 1 and the melt inlet of the plate extruder 3 are coaxial.

[0073] Step 2: Hoist the extrusion die 4 between the first extruder 1 and the platen extruder 3, connect the connecting cylinder 6 to the melt outlet end of the second extruder 2, slide and adjust the movable connecting head 7 so that the melt outlet end of the movable connecting head 7 is coaxial with the melt inlet end on the side of the extrusion die 4, and place a pad 8 of appropriate thickness according to the distance between the end face of the movable connecting head 7 and the end face of the connecting column 11 at this time, and then connect the connecting column 11 and the movable connecting head 7.

[0074] Step 3: The first extruder 1 and the second extruder 2 simultaneously output two different melts, which enter the extrusion die 4 to form a five-layer composite structure. Finally, the melt flows into the plate extruder 3 to be extruded into a slab, and then undergoes subsequent processes to finally form a plate. Specifically, the subsequent processes, including cooling, cutting, and coating, are described in detail in the existing technology and will not be elaborated here.

[0075] In specific operation, the present invention is as follows: the first extruder 1 and the second extruder 2 simultaneously output two different melts. The melt output by the first extruder 1 enters the first template 402 after passing through the first melt inlet 40101. After being diverted by the first template 402, it flows out from the two first diversion ports 40202 respectively. After being converged by the first confluence groove 40301, it enters the second template through-hole 40303.

[0076] The fluid from the second extruder 2 is divided into three streams after entering the extrusion die 4. Two streams enter the first semi-circular groove 40306 and the second semi-circular groove 40406, which are Y-shaped, and pass through the third template 404 through the outermost melt outlet 40407. The middle stream passes through the middle melt outlet 40402 formed between the two second combined plates 40403 and passes through the third template 404. The melt flowing out of the second extruder 2 is divided by the third template 404 and the melt flowing out of the first extruder 1 is sandwiched between the layers to form a five-layer composite structure. Finally, after passing through the fourth template 405 and the fifth template 406, it flows into the plate extruder 3 to be extruded into a slab and then undergoes subsequent processes to finally form a plate.

[0077] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A composite multilayer stabilized board extrusion equipment, characterized in that, include: The first extruder and the second extruder each extrude two melts for producing composite multilayer stabilized plates; A plate-out machine, used to flatten the melt and form a preliminary slab; An extrusion die is provided, with one end connected to a first extruder and the other end connected to an extruder. One side of the extrusion die is connected to a second extruder via a bent, movable connector. This connector guides two melts, compounded in a set ratio, to the extruder. The extrusion die is sequentially arranged from the first extruder towards the extruder, including a connecting plate, a first template, a second template, a third template, a fourth template, and a fifth template. The second and third templates have a first combined inlet and a second combined inlet on their sides, respectively. These inlets can be combined to form a complete connection to the second extruder. A first melt inlet is coaxially arranged on the connecting plate. The first template has a matching first template inlet facing the first melt inlet. The melt entering the first template is diverted by a diversion structure within the first template and flows out from two symmetrically arranged first diversion ports on the other end of the first template. The second template has a first confluence groove corresponding to the two first diversion ports. A second template through-hole is provided through the center of the second template. The second template has a first combined piece with a semi-circular cross-section at one end near the third template. A first semi-circular groove and a second semi-circular groove, capable of forming two complete cylindrical channels, are respectively provided between the second and third templates. The two complete cylindrical channels between the second and third templates are symmetrical and arranged in a Y-shape, both connecting to the second extruder. The third template has a third template opening at its center, and two second combined pieces, which cooperate with the first combined piece, are arranged parallel to each other within the third template opening. The first and second combined pieces also connect to the second extruder. The end of the second semi-circular groove has an outermost melt outlet penetrating the third template. The fourth template has a fourth template opening at its center that matches the third template opening, and second confluence grooves on both sides to guide the melt flowing out of the outermost melt outlet. The fifth template has a fifth template inlet at its center facing the fourth template, which cooperates with the fourth template opening. The other end of the fifth template has a melt outlet for connection to the platen ejector.

2. The composite multilayer stabilized board extrusion equipment according to claim 1, characterized in that: The third template has a support plate connected between the inner wall of the third template opening and the second assembly piece. The end of the support plate near the second template is flush with the end face of the third template, and its length is less than the thickness of the third template.

3. The composite multilayer stabilized board extrusion equipment according to claim 1, characterized in that: The first melt inlet of the connecting plate and the first template inlet of the first template have a continuous conical structure. The first melt inlet is fitted with a positioning tube. The outer wall of the positioning tube is conical and can fit the conical surfaces of the first melt inlet and the first template inlet. When the end face of the positioning tube is flush with the connecting plate, the outer wall of the positioning tube fits the conical surfaces of the first melt inlet and the first template inlet.

4. The composite multilayer stabilized board extrusion equipment according to claim 1, characterized in that: Each layer of the extrusion die, except for the connecting plate, is provided with two corresponding positioning holes. The two positioning holes are arranged circumferentially at 180-degree intervals. Positioning pins are inserted into the positioning holes, and the positioning holes between adjacent layers of the die are staggered.

5. The composite multilayer stabilized board extrusion equipment according to claim 1, characterized in that: The melt output end of the second extruder is connected to a connecting cylinder. A piston structure is provided at the end of the connecting cylinder away from the second extruder. The inner wall of the movable connecting head cooperates with the piston structure of the second extruder. The movable connecting head can slide along the axis of the connecting cylinder.

6. The composite multilayer stabilized board extrusion equipment according to claim 5, characterized in that: The other end of the movable connector is used to connect to the connecting column, and a gasket is placed between the connector and the connecting column. The other end of the connecting column is used to connect to the extrusion die.

7. The composite multilayer stabilized board extrusion equipment according to claim 1, characterized in that: The second template has a blocking strip at one end of the second template opening near the first template, and the width of the blocking strip is the same as that of the first assembly piece.

8. A method for extruding composite multilayer stabilized plates, characterized in that... The process of using the composite multilayer stabilized board extrusion equipment according to any one of claims 6-7 includes the following steps: Step 1: Install and adjust the first extruder, the second extruder, and the platen extruder so that their shafts are at the same height and the melt outlet of the first extruder is coaxial with the melt inlet of the platen extruder. Step 2: Hoist the extrusion die between the first extruder and the platen extruder, connect the connecting cylinder to the melt outlet end of the second extruder, slide and adjust the movable connecting head to make the melt outlet end of the movable connecting head coaxial with the melt inlet end on the side of the extrusion die, and place a shim of appropriate thickness according to the distance between the end face of the movable connecting head and the end face of the connecting column at this time, and then connect the connecting column and the movable connecting head. Step 3: The first extruder and the second extruder simultaneously output two different melts, which enter the extrusion die to form a five-layer composite structure. Finally, the melt flows into the plate extruder to be extruded into a slab, and then undergoes subsequent processes to finally form a plate.

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