Efficient extrusion and fitting device for sandwich board production

CN122808317APending Publication Date: 2026-09-25JIANGSU YANXIN ENVIRONMENTAL SCI & TECH CO LTD
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Patent Information

Application Number
CN202611199635.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-10
Publication Date
2026-09-25

AI Technical Summary

Technical Problem

然而,人工对齐放置多层板材时,各层板材之间容易出现偏移、错位的情况,导致挤压贴合后板材边缘参差不齐、层间胶层厚度不均,影响成品的尺寸精度和层间结合强度,此外,当芯材为软质材料时,软层中部易因自重产生塌陷后,其下表面呈中间向下凸出的下垂形态,人工搬运及放置过程中软层与底板接触时,软层中部先触底而两侧悬空,工人难以通过手动调整使软层恢复平整并均匀贴合于底板表面,影响后续顶层硬板的对齐精度和贴合质量,进一步影响贴合质量

Benefits of technology

[0036](1)本发明在加工时,工人将板材放置于机架上方,在放置软层时,利用多个刺针从软层两侧穿刺固定,同时利用移动驱动机构带动刺针向外拉伸软层,使软层保持平整张紧状态,防止软层中部因自重产生下垂塌陷,再利用升降板带动软层与底板平稳相贴,确保芯材与上下面板之间胶层厚度均匀一致、无空隙缺陷,从而提升贴合后的层间结合强度;

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Abstract

The application discloses a kind of high-efficiency extrusion laminating devices for sandwich panel production, and relates to the technical field of laminating device, including rack, first conveying part is fixedly connected to the outer side wall of rack, the output end of first driving part is fixedly connected with second conveying part, lifting plate is set on the top of rack, the outer side wall of lifting plate is slidably connected with connecting plate, the inner side wall of connecting plate is slidably connected with thorn needle, moving drive mechanism is set outside lifting plate, positioning mechanism is set outside rack, supporting mechanism is set outside rack, and suction mechanism is set outside lifting plate.The application is placed on the top of rack by worker when processing, when placing soft layer, a plurality of thorn needles are used to penetrate and fix from both sides of soft layer, and at the same time, moving drive mechanism is used to drive thorn needle to stretch soft layer outward, so that soft layer remains flat and tensioned state, to prevent the middle part of soft layer from sagging due to self-weight, and then lifting plate is used to drive soft layer to smoothly adhere to bottom plate.
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Description

Technical Field

[0001] This invention relates to the field of bonding equipment technology, and in particular to a high-efficiency extrusion bonding device for sandwich panel production. Background Technology

[0002] The high-efficiency extrusion bonding device for sandwich panel production is an automated core unit specifically designed to achieve rapid and uniform bonding of the upper and lower panels and the core material through mechanical pressure, heating or adhesive bonding in continuous or intermittent production. It aims to improve the interlayer bonding strength, production speed and thickness adaptability.

[0003] In existing extrusion bonding equipment, workers typically need to manually align and place multi-layer boards coated with adhesive onto the extrusion station before the extrusion mechanism applies pressure and bonds them together. However, during manual alignment and placement of multi-layer boards, misalignment and displacement between layers can easily occur, resulting in uneven edges and inconsistent adhesive layer thickness after extrusion bonding. This affects the dimensional accuracy and interlayer bonding strength of the finished product. Furthermore, when the core material is soft, the center of the soft layer is prone to collapse due to its own weight, causing its lower surface to sag downwards. During manual handling and placement, when the soft layer comes into contact with the base plate, the center of the soft layer touches the bottom first, while the sides are suspended. Workers find it difficult to manually adjust the soft layer to restore its flatness and evenly bond it to the base plate surface, affecting the alignment accuracy and bonding quality of the subsequent top rigid board, further impacting the overall bonding quality. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency extrusion bonding device for sandwich panel production, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency extrusion bonding device for sandwich panel production, comprising a frame;

[0006] A first conveyor is fixedly connected to the outer wall of the frame, and a second conveyor is provided above the first conveyor. The first and second conveyors are used to extrude and bond the sheet material.

[0007] A lifting plate is disposed above the frame. A connecting plate is slidably connected to the outer side wall of the lifting plate, and a needle is slidably connected to the inner side wall of the connecting plate. The needle is used to pierce and fix both sides of the soft core material.

[0008] A movable drive mechanism is disposed outside the lifting plate and is used to drive the connecting plate to move.

[0009] A positioning mechanism is disposed outside the frame and is used to position the edges of the plate placed on the frame.

[0010] A support mechanism is disposed outside the frame and is used to support the sheet material from below during extrusion bonding.

[0011] An adsorption mechanism is provided outside the lifting plate and is used to adsorb the top rigid plate under negative pressure.

[0012] Preferably, the support mechanism includes:

[0013] A square shell, which is fixedly connected to the top of the frame;

[0014] A support plate is slidably connected to the outer wall of a square shell, and a positioning plate is fixedly connected to the outer wall of the support plate. The support plate is used to support the multi-layer boards to be bonded.

[0015] Preferably, the support mechanism further includes:

[0016] The fourth driving component is fixedly disposed inside the square shell and is used to drive the support plate to move.

[0017] A guide rod is fixedly connected to the inner wall of the square shell, and the bearing plate is slidably sleeved on the outer peripheral wall of the guide rod. The guide rod is used to guide the lifting and lowering of the bearing plate.

[0018] Preferably, the motion drive mechanism includes:

[0019] A movable shell, which is slidably connected to the outer wall of the lifting plate;

[0020] The slider is slidably connected to the inner side wall of the movable shell, and the connecting plate is fixedly connected to the outer side wall of the slider. The slider is used to drive the connecting plate and the needle to move.

[0021] Preferably, the motion drive mechanism further includes:

[0022] A guide plate is fixedly connected to the outer wall of the lifting plate. A fixed shell is fixedly connected to the outer wall of the frame. The guide plate is slidably connected to the outer wall of the fixed shell. The guide plate is used to provide guidance for the lifting of the lifting plate.

[0023] The third driving component is fixedly installed on the outer wall of the lifting plate and is used to drive the moving shell to move.

[0024] Preferably, the adsorption mechanism includes:

[0025] A square plate, which is fixedly connected to the outer wall of the movable shell;

[0026] The seventh driving component is fixedly connected to the outer wall of the square plate, and a suction cup is fixedly connected to the output end of the seventh driving component.

[0027] Preferably, a sixth driving member is fixedly connected to the outer wall of the connecting plate, and the sixth driving member is used to drive the needle to move.

[0028] Preferably, a second driving member is fixedly connected to the top of the fixed shell, the second driving member is used to drive the guide plate to move, a first driving member is fixedly connected to the outer wall of the first conveyor, and the output end of the first driving member is used to drive the second conveyor to move.

[0029] Preferably, the support mechanism includes:

[0030] A support plate is fixedly connected to the outer wall of the frame, and a fifth driving component is fixedly connected to the outer wall of the support plate;

[0031] An extrusion shell is fixedly connected to the output end of the fifth drive component, and the extrusion shell is used to position the plate.

[0032] Preferably, the support mechanism further includes:

[0033] A roller is rotatably connected to the inner wall of the extrusion shell, and the roller is used to roll and contact the surface of the sheet material during the extrusion bonding process;

[0034] A protective sleeve is fixedly fitted onto the outer peripheral wall of the roller, and the protective sleeve is used to protect the surface of the plate.

[0035] The technical effects and advantages of this invention are as follows:

[0036] (1) During processing, the worker places the board above the machine frame. When placing the soft layer, multiple needles are used to pierce and fix it from both sides of the soft layer. At the same time, the moving drive mechanism is used to drive the needles to stretch the soft layer outward, so that the soft layer is kept flat and taut, preventing the soft layer from sagging and collapsing due to its own weight. Then, the lifting plate is used to drive the soft layer to be smoothly attached to the bottom plate, ensuring that the adhesive layer between the core material and the upper and lower panels is uniform and consistent in thickness, without gaps or defects, thereby improving the interlayer bonding strength after bonding.

[0037] (2) When placing the top rigid plate, the present invention uses the negative pressure of the adsorption mechanism to adsorb the plate. The suction cup is precisely lifted by the seventh driving component to smoothly transport the rigid plate to the top of the soft layer and then release it. The rigid plate is fixed by the adsorption mechanism throughout the process and is not affected by the shaking of the manual hand. The placement position is preset to ensure that the position of the rigid plate is consistent each time. This avoids placement offset and misalignment caused by hand shaking, obstruction of vision or difference in operation during manual handling and placement. It ensures that the edges of each layer of plate are precisely aligned and improves the dimensional accuracy and edge regularity of the finished plate after extrusion and bonding. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a frontal perspective view of the present invention;

[0040] Figure 2 This is a three-dimensional structural diagram of the fixing shell of the present invention;

[0041] Figure 3 This is a three-dimensional structural diagram of the support plate of the present invention;

[0042] Figure 4 This is a three-dimensional structural diagram of the lifting plate of the present invention;

[0043] Figure 5 This is a three-dimensional structural diagram of the slider of the present invention;

[0044] Figure 6 This is a three-dimensional structural diagram of the needle of the present invention;

[0045] Figure 7 This is a three-dimensional structural diagram of the protective sleeve of the present invention.

[0046] In the attached diagram: 1. Frame; 2. First conveyor; 3. First drive component; 4. Second conveyor; 51. Fixed shell; 52. Moving shell; 53. Second drive component; 54. Slider; 55. Lifting plate; 56. Third drive component; 57. Guide plate; 61. Bearing plate; 62. Positioning plate; 63. Fourth drive component; 64. Guide rod; 65. Square shell; 71. Extrusion shell; 72. Roller; 73. Fifth drive component; 74. Support plate; 75. Protective sleeve; 81. Connecting plate; 82. Needle; 83. Sixth drive component; 84. Suction cup; 85. Square plate; 86. Seventh drive component. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention provides, for example Figures 1-7 The diagram shows a high-efficiency extrusion bonding device for sandwich panel production.

[0049] Example 1: Includes a frame 1, a first conveyor 2, a lifting plate 55, a moving drive mechanism, a positioning mechanism, a support mechanism, and an adsorption mechanism. The first conveyor 2 is fixedly connected to the outer wall of the frame 1. A second conveyor 4 is provided above the first conveyor 2. The first conveyor 2 and the second conveyor 4 are used to extrude and bond the sheet material. The lifting plate 55 is located above the frame 1. A connecting plate 81 is slidably connected to the outer wall of the lifting plate 55. A needle 82 is slidably connected to the inner wall of the connecting plate 81. The needle 82 is used to pierce and fix both sides of the soft core material. The moving drive mechanism is located outside the lifting plate 55. The moving drive mechanism is used to drive the connecting plate 81 to move. The positioning mechanism is located outside the frame 1. The positioning mechanism is used to position the edge of the sheet material placed on the frame 1. The support mechanism is located outside the frame 1. The support mechanism is used to support the sheet material from below during extrusion and bonding. The adsorption mechanism is located outside the lifting plate 55. The adsorption mechanism is used to adsorb the top hard plate under negative pressure.

[0050] The frame 1 is the main frame of the extrusion bonding device. The first conveyor 2 and the second conveyor 4 are a pair of conveyor belts arranged vertically opposite each other. The first drive unit 3 is an electric hydraulic rod that drives the second conveyor 4 to move up and down to adjust the gap between it and the first conveyor 2, thereby achieving the extrusion bonding of multi-layer boards. In specific use: During processing, the worker places the board above the frame 1. When placing the soft layer, multiple needles 82 are used to pierce and fix it from both sides of the soft layer. At the same time, the moving drive mechanism drives the needles 82 to stretch the soft layer outward, keeping the soft layer flat and taut, preventing the soft layer from sagging and collapsing due to its own weight. Then, the lifting plate 55 is used to drive the soft layer to be smoothly bonded to the base plate, ensuring the core... The adhesive layer between the material and the upper and lower panels is of uniform thickness and without gaps or defects, thereby improving the interlayer bonding strength after lamination. When placing the top rigid board, the suction mechanism uses negative pressure to adsorb the board. The suction cup 84 is precisely lifted and lowered by the seventh drive component 86 to smoothly transport the rigid board to the top of the soft layer and then release it. Throughout the process, the rigid board is fixed by the suction mechanism and is not affected by manual shaking. The placement position is preset to ensure that the rigid board is placed in the same position each time, avoiding placement offset and misalignment caused by hand shaking, obstruction of vision or difference in operation during manual handling and placement. This ensures that the edges of each layer of board are precisely aligned, improving the dimensional accuracy and edge regularity of the finished board after extrusion lamination.

[0051] The support mechanism includes a square shell 65 and a bearing plate 61. The square shell 65 is fixedly connected to the top of the frame 1. The bearing plate 61 is slidably connected to the outer wall of the square shell 65. A positioning plate 62 is fixedly connected to the outer wall of the bearing plate 61. The bearing plate 61 is used to support the multi-layer board to be bonded. The support mechanism also includes a fourth driving member 63 and a guide rod 64. The fourth driving member 63 is fixedly installed inside the square shell 65 and is used to drive the bearing plate 61 to move. The guide rod 64 is fixedly connected to the inner wall of the square shell 65. The bearing plate 61 is slidably sleeved on the outer peripheral wall of the guide rod 64. The guide rod 64 is used to provide guidance for the lifting and lowering of the bearing plate 61.

[0052] The moving drive mechanism includes a movable housing 52 and a slider 54. The movable housing 52 is slidably connected to the outer wall of the lifting plate 55, and the slider 54 is slidably connected to the inner wall of the movable housing 52. A connecting plate 81 is fixedly connected to the outer wall of the slider 54. The slider 54 is used to drive the connecting plate 81 and the needle 82 to move. The moving drive mechanism also includes a guide plate 57 and a third drive component 56. The guide plate 57 is fixedly connected to the outer wall of the lifting plate 55. A fixed housing 51 is fixedly connected to the outer wall of the frame 1. The guide plate 57 is slidably connected to the outer wall of the fixed housing 51. The guide plate 57 is used to provide guidance for the lifting of the lifting plate 55. The third drive component 56 is fixedly disposed on the outer wall of the lifting plate 55. The third driving member 56 is used to drive the moving shell 52 to move. The adsorption mechanism includes a square plate 85 and a seventh driving member 86. The square plate 85 is fixedly connected to the outer wall of the moving shell 52. The seventh driving member 86 is fixedly connected to the outer wall of the square plate 85. A suction cup 84 is fixedly connected to the output end of the seventh driving member 86. A sixth driving member 83 is fixedly connected to the outer wall of the connecting plate 81. The sixth driving member 83 is used to drive the needle 82 to move. A second driving member 53 is fixedly connected to the top of the fixed shell 51. The second driving member 53 is used to drive the guide plate 57 to move. A first driving member 3 is fixedly connected to the outer wall of the first conveyor 2. The output end of the first driving member 3 is used to drive the second conveyor 4 to move.

[0053] The third driving component 56 consists of a servo motor and a bidirectional screw. The servo motor drives the bidirectional screw to rotate, which in turn moves the movable housing 52 towards or away from the other side. The lifting plate 55 has an external sliding groove, which is inclined. As the movable housing 52 moves, the slider 54 moves axially along the inner wall of the movable housing 52 under the action of the sliding groove. The slider 54 drives multiple sets of needles 82 to move, and the expansion of the needles 82 can tension the soft layer. A displacement sensor is installed on the outside of the lifting plate 55, which is electrically connected to the controller to detect the moving distance of the needles 82. After the needles 82 pierce into both sides of the soft layer, the third driving component 56 drives the moving shell 52 to move, causing the needles 82 on both sides to expand outward. The displacement sensor detects the expansion displacement of the needles 82 in real time and transmits the signal to the controller. The controller has a preset tension displacement threshold for soft layer materials of different specifications. This threshold is preset according to the elastic modulus, size and required tension of the soft layer material. When the displacement sensor detects that the expansion distance of the needles 82 reaches the preset threshold, the controller controls the third driving component 56 to stop, and the needles 82 stop at the current expansion position. At this time, the soft layer is stretched. To achieve a flat and taut state without excessive stretching, the seventh drive component 86 is a cylinder. The suction cup 84 is connected to an external vacuum pump via a pipeline. When the top rigid plate needs to be placed, the seventh drive component 86 drives the suction cup 84 to descend and contact the surface of the rigid plate. The vacuum pump starts, creating negative pressure inside the suction cup 84 to adsorb the rigid plate. Then, the seventh drive component 86 drives the suction cup 84 and the rigid plate to rise and move above the soft layer. The negative pressure is released to place the rigid plate on the soft layer. The sixth drive component 83 is a cylinder, and its output end is fixedly connected to the needle 82. The extension and retraction of the sixth drive component 83 drives the needle 82. 2. Extend to pierce the soft layer or retract to withdraw. The second driving component 53 is a cylinder. The output end of the second driving component 53 is fixedly connected to the guide plate 57. The guide plate 57 and the lifting plate 55 are moved up and down along the fixed shell 51 by the extension and retraction of the second driving component 53 to adjust the height position of the needle 82 and the suction cup 84. The fifth driving component 73 is a cylinder. When the extrusion is applied, the fifth driving component 73 drives the extrusion shell 71 to move towards the plate. The extrusion shell 71 positions the edge of the plate. The roller 72 rolls and contacts the plate to reduce friction when the plate passes through. The protective sleeve 75 prevents the roller 72 from scratching the surface of the plate.

[0054] Example 2: Example 2 further discloses, based on Example 1, that the support mechanism includes a support plate 74 and an extrusion shell 71. The support plate 74 is fixedly connected to the outer wall of the frame 1. A fifth driving member 73 is fixedly connected to the outer wall of the support plate 74. The extrusion shell 71 is fixedly connected to the output end of the fifth driving member 73. The extrusion shell 71 is used to position the sheet material. The support mechanism also includes a roller 72 and a protective sleeve 75. The roller 72 is rotatably connected to the inner wall of the extrusion shell 71. The roller 72 is used to roll and contact the surface of the sheet material during the extrusion and bonding process. The protective sleeve 75 is fixedly sleeved on the outer peripheral wall of the roller 72. The protective sleeve 75 is used to protect the surface of the sheet material.

[0055] The fourth driving component 63 consists of a servo motor and a bidirectional threaded rod. The bidirectional threaded rod rotates to move the support plate 61. When placing the sheet material, the soft layer or top layer can be placed on the support plate 61. The positioning plate 62 limits the edge of the sheet material to prevent it from shifting during extrusion. During the descent of the lifting plate 55, the two support plates 61 move away from each other to prevent obstruction. In specific use: the worker first places the bottom hard plate on the support plate 61, the positioning plate 62 positions the edge of the bottom hard plate, then the soft core material is placed, and the second driving component 53 drives the lifting plate 55... 5. When the material descends to the predetermined height, the sixth drive component 83 drives the needle 82 to extend and pierce into both sides of the soft layer. The third drive component 56 drives the moving shell 52 to move, causing the needles 82 on both sides to stretch the soft layer outward to make it taut and flat. The fifth drive component 73 drives the extrusion shell 71 to perform auxiliary positioning on the edge of the bottom plate. The lifting plate 55 descends and moves to place the taut and flat soft core material on the bottom plate. Then, the seventh drive component 86 drives the suction cup 84 to descend and adsorb the top hard plate, and transport the top hard plate to the top of the soft layer. The first drive component 3 drives the second conveyor 4 to descend and cooperate with the first conveyor 2 to extrude and bond the multi-layer board.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency extrusion bonding device for sandwich panel production, characterized in that, include: Rack (1); The first conveyor (2) is fixedly connected to the outer wall of the frame (1), and a second conveyor (4) is provided above the first conveyor (2). The first conveyor (2) and the second conveyor (4) are used to extrude and bond the sheet material. A lifting plate (55) is provided above the frame (1). A connecting plate (81) is slidably connected to the outer wall of the lifting plate (55). A needle (82) is slidably connected to the inner wall of the connecting plate (81). The needle (82) is used to pierce and fix the two sides of the soft core material. A moving drive mechanism is provided outside the lifting plate (55) and is used to drive the connecting plate (81) to move. A positioning mechanism is provided outside the frame (1) and is used to position the plate placed on the frame (1) at the edge. A support mechanism is provided outside the frame (1) and is used to support the sheet material from below during extrusion bonding; The adsorption mechanism is located outside the lifting plate (55) and is used for negative pressure adsorption of the top hard plate.

2. The high-efficiency extrusion bonding device for sandwich panel production according to claim 1, characterized in that, The supporting structure includes: A square shell (65) is fixedly connected to the top of the frame (1); The support plate (61) is slidably connected to the outer wall of the square shell (65), and the outer wall of the support plate (61) is fixedly connected to the positioning plate (62). The support plate (61) is used to support the multi-layer board to be bonded.

3. The high-efficiency extrusion bonding device for sandwich panel production according to claim 2, characterized in that, The support mechanism also includes: The fourth driving component (63) is fixedly disposed inside the square shell (65) and is used to drive the support plate (61) to move. The guide rod (64) is fixedly connected to the inner wall of the square shell (65), and the bearing plate (61) is slidably sleeved on the outer peripheral wall of the guide rod (64). The guide rod (64) is used to provide guidance for the lifting and lowering of the bearing plate (61).

4. The high-efficiency extrusion bonding device for sandwich panel production according to claim 1, characterized in that, The movement drive mechanism includes: A movable shell (52) is slidably connected to the outer wall of the lifting plate (55); The slider (54) is slidably connected to the inner wall of the movable shell (52), and the connecting plate (81) is fixedly connected to the outer wall of the slider (54). The slider (54) is used to drive the connecting plate (81) and the needle (82) to move.

5. The high-efficiency extrusion bonding device for sandwich panel production according to claim 1, characterized in that, The motion drive mechanism also includes: Guide plate (57), the guide plate (57) is fixedly connected to the outer wall of the lifting plate (55), the outer wall of the frame (1) is fixedly connected to the fixed shell (51), the guide plate (57) is slidably connected to the outer wall of the fixed shell (51), the guide plate (57) is used to provide guidance for the lifting of the lifting plate (55); The third driving component (56) is fixedly installed on the outer wall of the lifting plate (55) and is used to drive the moving shell (52) to move.

6. The high-efficiency extrusion bonding device for sandwich panel production according to claim 4, characterized in that, The adsorption mechanism includes: A square plate (85) is fixedly connected to the outer wall of the movable shell (52); The seventh driving component (86) is fixedly connected to the outer wall of the square plate (85), and a suction cup (84) is fixedly connected to the output end of the seventh driving component (86).

7. The high-efficiency extrusion bonding device for sandwich panel production according to claim 1, characterized in that, The outer wall of the connecting plate (81) is fixedly connected to a sixth driving member (83), which is used to drive the needle (82) to move.

8. The high-efficiency extrusion bonding device for sandwich panel production according to claim 5, characterized in that, The top of the fixed shell (51) is fixedly connected to a second driving member (53), which is used to drive the guide plate (57) to move. The outer wall of the first conveyor (2) is fixedly connected to a first driving member (3), and the output end of the first driving member (3) is used to drive the second conveyor (4) to move.

9. The high-efficiency extrusion bonding device for sandwich panel production according to claim 1, characterized in that, The supporting structure includes: Support plate (74), the support plate (74) is fixedly connected to the outer wall of the frame (1), and the outer wall of the support plate (74) is fixedly connected to a fifth driving component (73). The extrusion shell (71) is fixedly connected to the output end of the fifth drive unit (73) and is used to position the plate.

10. The high-efficiency extrusion bonding device for sandwich panel production according to claim 9, characterized in that, The support mechanism also includes: Roller (72), which is rotatably connected to the inner wall of the extrusion shell (71), is used to roll and contact the surface of the sheet during the extrusion bonding process; A protective sleeve (75) is fixedly fitted onto the outer peripheral wall of the roller (72). The protective sleeve (75) is used to protect the surface of the plate.