A method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process

Abstract

This application discloses a method for preparing L-shaped conductive foam shielding material based on a roll-to-roll continuous welding process. When the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through an ultrasonic roll welding mechanism, the side conductive foam shielding materials on both sides are welded to the upper sides of the bottom conductive foam shielding material. When the welded bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through a cooling mechanism, the cooling mechanism cools the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides. When the cooled bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through a slitting and punching mechanism, the slitting and punching mechanism cuts the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides into two L-shaped conductive foam shielding materials. This application significantly reduces material waste and improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding material production technology, and in particular to a method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process. Background Technology

[0002] In the electromagnetic shielding design of electronic devices (such as servers, communication chassis, LCD display modules, etc.), it is often necessary to place L-shaped shielding materials at the corners of the chassis, the edges of the modules, or the structural turning points to achieve continuous and effective shielding of the corner areas.

[0003] At present, the mainstream processes for preparing L-shaped conductive foam shielding materials in the industry are mainly divided into two categories: adhesive bonding process and vibration knife cutting integrated molding process.

[0004] Among these processes, adhesive bonding is a traditional manufacturing method. It primarily involves manually bonding the punched-out bottom conductive foam to the side conductive foam using double-sided adhesive or conductive adhesive to form an L-shaped shielding structure. This process is highly dependent on manual operation, with extremely low automation. Not only is the overall production efficiency low, making it unsuitable for large-scale mass production, but the significant variations in manual adhesive application and alignment lead to inconsistent bonding, unstable bond strength, and difficulty in controlling product yield. Furthermore, conventional adhesives themselves lack conductivity, creating insulating barriers at the bonding interface. This disrupts the overall conductive continuity of the L-shaped conductive foam, creating shielding gaps and significantly reducing the electromagnetic shielding performance of the shielding component, making it difficult to meet the shielding standards of high-precision electronic equipment.

[0005] Among them, the vibratory knife cutting integrated molding process can directly use vibratory knife cutting equipment to punch and cut a whole thick conductive foam board to form an L-shaped three-dimensional conductive foam structure in one piece, avoiding the defects such as conductive breakage and unstable bonding caused by glue bonding. However, this process still has many technical shortcomings: First, the hollow area inside the L-shaped structure is directly discarded as waste during the cutting and molding process, resulting in extremely low raw material utilization, large material loss, and high production costs; Second, for thick conductive foam structures with a height of more than 10mm, the forming accuracy of vibratory knife cutting is poor, and it is difficult to guarantee the flatness of the product edges and corners and the consistency of dimensions, which easily leads to quality problems such as deformation and punching deviation; Third, the thick material cutting process is complex, the forming speed is slow, and the production capacity is limited, which cannot meet the industry's needs for large-scale and standardized production.

[0006] To address the aforementioned issues, this application discloses an ultrasonic roll welding device for L-shaped conductive foam shielding material. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, this invention discloses a method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process.

[0008] To achieve the above objectives, the technical solution adopted by this invention is: a method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process, comprising a support platform, a raw material unwinding mechanism, a plasma treatment mechanism, an ultrasonic roll welding mechanism, a cooling mechanism, and a slitting and punching mechanism arranged sequentially on the support platform along a set direction, the method specifically including the following steps:

[0009] The first step involves the unwinding mechanism releasing a bottom conductive foam shielding material, which is then plasma-sprayed onto its welding surface by a plasma treatment mechanism. The unwinding mechanism also releases two side conductive foam shielding materials, which are then plasma-sprayed onto their welding surfaces by a plasma treatment mechanism. These materials are then stacked on both sides above the bottom conductive foam shielding material.

[0010] The second step involves the ultrasonic welding mechanism passing the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides. The side conductive foam shielding materials on both sides will be welded to the top two sides of the bottom conductive foam shielding material by the ultrasonic welding mechanism.

[0011] The third step is that when the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through the cooling mechanism, the cooling mechanism will cool down the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides.

[0012] The fourth step involves the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides passing through a slitting and punching mechanism after the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides have been cooled. The slitting and punching mechanism cuts the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides into two L-shaped conductive foam shielding materials.

[0013] More preferably, inverted U-shaped angle steels are respectively erected on both sides of the support platform for shielding two side conductive foam materials, and the two inverted U-shaped angle steels are respectively provided with a first partition and a second partition for the ultrasonic rolling welding mechanism and the cooling mechanism. The raw material unwinding mechanism and the plasma treatment mechanism are respectively located at the front section of the two inverted U-shaped angle steels, and the cutting and punching mechanism is located at the rear section of the two inverted U-shaped angle steels.

[0014] More preferably, the raw material unwinding mechanism includes a first servo unwinding frame located on one side of the support platform for releasing the bottom conductive foam shielding material, and two second servo unwinding frames located on the front sides of the first servo unwinding frame for releasing the side conductive foam shielding material.

[0015] More preferably, the plasma treatment mechanism includes a first isolation cover, a transverse support arm disposed inside the isolation cover, a first plasma nozzle disposed at the bottom of the transverse support arm for plasma spraying the bottom conductive foam shielding material, a U-shaped frame disposed on both sides of the inner top wall of the first isolation cover at the rear section of the transverse support arm for the side conductive foam shielding material to pass through, two guide wheels disposed inside the two U-shaped frames for guiding the side conductive foam shielding material, and two second plasma nozzles disposed above the inner bottom wall of the two U-shaped frames for plasma spraying the two sides conductive foam shielding materials.

[0016] More preferably, the ultrasonic welding mechanism includes a first mounting groove formed on the support platform at the first partition, a bottom roller disposed inside the first mounting groove and flush with the surface of the support platform, and an ultrasonic welding roller rotatably mounted above the bottom roller.

[0017] More preferably, the outer surface of the ultrasonic welding roller is formed with a knurled or textured structure.

[0018] More preferably, the cooling mechanism includes a second isolation cover disposed on the support platform at the first partition and a fan disposed on the inner wall of the second isolation cover.

[0019] More preferably, the cutting and punching mechanism includes a second mounting groove on the support platform, a lower die disposed inside the second mounting groove, and an upper die corresponding to the lower die mounted above the support platform and lifted and lowered by a hydraulic cylinder.

[0020] More preferably, the bottom of the upper die is provided with a T-shaped punch cutter, and the upper surface of the lower die is provided with a T-shaped groove corresponding to the T-shaped punch cutter.

[0021] Further preferably, it also includes a double-layer clamping conveyor mechanism, which is located between the cooling mechanism and the slitting and punching mechanism. The double-layer clamping conveyor mechanism includes a third mounting groove on the support platform, a lower belt conveyor line located inside the third mounting groove and flush with the surface of the support platform, and an upper belt conveyor line erected above the lower belt conveyor line. A gap is provided between the upper belt conveyor line and the lower belt conveyor line for the bottom conductive foam shielding material to pass through.

[0022] The present invention achieves the following beneficial effects:

[0023] First, this application uses ultrasonic welding to prepare L-shaped conductive foam shielding material, which eliminates the need for pre-reserved glue curing time and can be adapted to large-scale automated production scenarios, effectively solving the problems of low production efficiency and inability to achieve large-scale mass production in traditional processes.

[0024] Secondly, this application separately welds two side conductive foam shielding materials to the upper two sides of the bottom conductive foam shielding material and then cuts them using a slitting and punching mechanism to form two L-shaped conductive foam shielding materials in one step. This avoids the large amount of material waste caused by the traditional thick plate integral cutting process and reduces raw material loss. At the same time, it eliminates the cost of glue materials and labor costs required for the adhesive bonding process, effectively reducing the overall production cost of the product and improving work efficiency.

[0025] Third, in the ultrasonic welding process, the upper and lower conductive foam layers can be fused together at the interface to form a complete and continuous conductive network, which completely eliminates the isolation problem caused by the non-conductive adhesive layer in the adhesive process, avoids defects such as high interface contact resistance and electromagnetic leakage, and ensures the continuity and stability of the product's electromagnetic shielding performance.

[0026] Fourth, this application achieves molecular-level bonding of materials through ultrasonic welding, and its bonding strength is significantly higher than that of traditional adhesive bonding methods. Especially for stress-prone areas such as corners of L-shaped products, the welded structure is less prone to cracking, peeling and other failures, effectively extending the product's service life and improving the overall structural stability of the product.

[0027] Fifth, the entire production process of this application does not require the use of any chemical consumables such as glue and solvents, has no VOC emissions, and produces no polluting byproducts, fully meeting the industry's standards and requirements for green manufacturing.

[0028] Other features and advantages of the invention will be set forth in the following description and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the disclosure of this invention and, together with the description, serve to explain the principles of this disclosure.

[0030] Figure 1 This is a schematic diagram of the L-shaped conductive foam shielding material structure disclosed in this invention;

[0031] Figure 2 This is a schematic diagram of the overall structure disclosed in this invention;

[0032] Figure 3 This is a schematic diagram of the raw material unwinding mechanism disclosed in this invention;

[0033] Figure 4 This is a schematic diagram of the plasma processing mechanism disclosed in this invention;

[0034] Figure 5This is a schematic diagram of the ultrasonic roll welding mechanism disclosed in this invention;

[0035] Figure 6 This is a schematic diagram of the cooling mechanism structure disclosed in this invention;

[0036] Figure 7 This is a schematic diagram of the cutting and punching mechanism structure disclosed in this invention;

[0037] Figure 8 This is a schematic diagram of the double-layer clamping and conveying mechanism disclosed in this invention;

[0038] Figure 9 This is a schematic diagram of the punching separation mechanism disclosed in this invention;

[0039] In the diagram: 10. Support platform; 11. First mounting slot; 12. Second mounting slot; 13. Third mounting slot;

[0040] 20. Raw material unwinding mechanism; 21. First servo unwinding frame; 22. Second servo unwinding frame;

[0041] 30. Plasma treatment mechanism; 31. First isolation hood; 32. Lateral support arm; 33. First plasma nozzle; 34. U-shaped frame; 35. Guide wheel; 36. Second plasma nozzle;

[0042] 40. Ultrasonic rolling welding mechanism; 41. Bottom roller; 42. Ultrasonic welding roller;

[0043] 50. Cooling mechanism; 51. Second isolation cover; 52. Fan;

[0044] 60. Slitting and punching mechanism; 61. Lower die; 611. T-shaped cutting groove; 62. Upper die; 621. T-shaped punching cutter; 63. Hydraulic cylinder;

[0045] 70. Inverted U-shaped angle steel;

[0046] 80. Double-layer clamping conveyor mechanism; 81. Lower belt conveyor line; 82. Upper belt conveyor line;

[0047] A. L-shaped conductive foam shielding material; A1. Bottom conductive foam shielding material; A2. Side conductive foam shielding material. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0049] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0050] Example

[0051] To address the issue of existing technologies that use adhesive bonding and vibratory knife cutting in a single molding process, such as... Figure 1 The L-shaped conductive foam shielding material shown has a series of shortcomings, as referenced Figure 2 As shown, this application provides a method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process, including a support platform 10, a raw material unwinding mechanism 20 arranged sequentially on the support platform 10 along a set direction, a plasma treatment mechanism 30, an ultrasonic roll welding mechanism 40, a cooling mechanism 50, and a slitting and punching mechanism 60. The method specifically includes the following steps:

[0052] First, the raw material unwinding mechanism 20 releases a bottom conductive foam shielding material, which is then plasma-sprayed onto its welding surface by the plasma treatment mechanism 30. The raw material unwinding mechanism 20 also releases two side conductive foam shielding materials, which are then plasma-sprayed onto their welding surfaces by the plasma treatment mechanism 30. These materials are then stacked on both sides above the bottom conductive foam shielding material.

[0053] In the second step, when the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through the ultrasonic roll welding mechanism 40, the side conductive foam shielding materials on both sides will be welded to the upper sides of the bottom conductive foam shielding material by the ultrasonic roll welding mechanism 40.

[0054] The third step is that when the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides that have been welded pass through the cooling mechanism 50, the cooling mechanism 50 will cool down the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides.

[0055] Fourth step: When the cooled bottom conductive foam shielding material and the side conductive foam shielding materials are passed through the slitting and punching mechanism 60, the slitting and punching mechanism 60 cuts the bottom conductive foam shielding material A1 and the side conductive foam shielding materials A2 to form two L-shaped conductive foam shielding materials A (refer to...). Figure 9 (As shown).

[0056] refer to Figure 2As shown, in one preferred embodiment, inverted U-shaped angle steels 70 are respectively erected on both sides of the support platform 10 for two side conductive foam shielding materials. The two inverted U-shaped angle steels 70 are respectively provided with a first partition (not shown) and a second partition (not shown) corresponding to the ultrasonic welding mechanism 40 and the cooling mechanism 50. The raw material unwinding mechanism 20 and the plasma treatment mechanism 30 are respectively located at the front section of the two inverted U-shaped angle steels 70. The cutting and punching mechanism 60 is located at the rear section of the two inverted U-shaped angle steels 70. After the two side conductive foam shielding materials are plasma sprayed on their welding surfaces by the plasma treatment mechanism 30, they will enter the interior of one inverted U-shaped angle steel 70. After entering the interior of the inverted U-shaped angle steel 70, the two side conductive foam shielding materials can be accurately positioned above the bottom conductive foam shielding material.

[0057] refer to Figure 3 As shown, in this embodiment, the raw material unwinding mechanism 20 of this application includes a first servo unwinding frame 21 disposed on one side of the support platform 10 for releasing the bottom conductive foam shielding material, and two second servo unwinding frames 22 disposed on the front sides of the first servo unwinding frame 21 for releasing the side conductive foam shielding material. In specific implementation, a roll of bottom conductive foam shielding material and two cut side conductive foam shielding materials are respectively loaded onto the first servo unwinding frame 21 and the two second servo unwinding frames 22. When the first servo unwinding frame 21 is working, the bottom conductive foam shielding material can be released. When the two second servo unwinding frames 22 are working, two strips of side conductive foam shielding material can be released.

[0058] refer to Figure 4 As shown, in this embodiment, the plasma processing mechanism 30 of this application includes a first isolation cover 31, a transverse support arm 32 disposed inside the isolation cover, a first plasma nozzle 33 disposed at the bottom of the transverse support arm 32 for plasma spraying of the bottom conductive foam shielding material, a U-shaped frame 34 disposed on both sides of the inner top wall of the first isolation cover 31 at the rear section of the transverse support arm 32 for the side conductive foam shielding material to pass through, two guide wheels 35 disposed inside the two U-shaped frames 34 for guiding the side conductive foam shielding material, and two guide wheels 35 disposed inside the two U-shaped frames 34 respectively. Above the inner bottom wall of the two U-shaped frames 34 are two second plasma nozzles 36 used for plasma spraying of the two side conductive foam shielding materials. When the bottom conductive foam shielding material passes through the first plasma nozzle 33, the first plasma nozzle 33 will perform plasma spraying on its welding surface. Similarly, after the two side conductive foam shielding materials pass through the guide wheel 35 from the two U-shaped frames 34, the two second plasma nozzles 36 will respectively perform plasma spraying on their welding surfaces. In this way, the fusion bonding strength during subsequent ultrasonic welding can be enhanced.

[0059] refer to Figure 5As shown, in this embodiment, the ultrasonic welding mechanism 40 of this application includes a first mounting groove 11 opened at the first partition on the support platform 10, a bottom roller 41 disposed inside the first mounting groove 11 and flush with the surface of the support platform 10, and an ultrasonic welding roller 42 rotatably mounted above the bottom roller 41. When the two side conductive foam shielding materials and the bottom conductive foam shielding material pass through the ultrasonic welding roller, the ultrasonic welding roller 42 will cooperate with the bottom roller 41 to weld the two side conductive foam shielding materials to the bottom conductive foam shielding material. In order to increase the friction on the side conductive foam shielding materials and prevent slippage, this application also forms a knurled or textured structure on the outer surface of the ultrasonic welding roller 42. Of course, in specific implementation, the ultrasonic welding roller 42 can also adopt other anti-slip structures, which will not be elaborated here.

[0060] refer to Figure 6 As shown, in this embodiment, the cooling mechanism 50 of this application includes a second isolation cover 51 disposed on the support platform 10 at the first partition and a fan 52 disposed on the inner side wall of the second isolation cover 51. When the two side conductive foam shielding materials are welded to the bottom conductive foam shielding material and moved into the second isolation cover 51, the fan 52 blows air to dissipate heat from the bottom conductive foam shielding material and the two side conductive foam shielding materials welded above it. This can prevent the foam from rebounding or deforming due to residual heat, and at the same time eliminate the internal stress generated during the welding process.

[0061] refer to Figure 7 As shown, in this embodiment, the slitting and punching mechanism 60 of this application includes a second mounting groove 12 opened on the support platform 10, a lower mold 61 disposed inside the second mounting groove 12, and an upper mold 62 corresponding to the lower mold 61 mounted above the support platform 10 and driven to rise and fall by a hydraulic cylinder 63. Specifically, the bottom of the upper mold 62 is provided with a T-shaped punching cutter 621, and the upper surface of the lower mold 61 is provided with a T-shaped cutting groove 611 corresponding to the T-shaped punching cutter 621. After the bottom conductive foam shielding material and the two side conductive foam shielding materials welded above it enter the lower mold 61 to a set length, the hydraulic cylinder 63 will drive the upper mold 62 to descend. During this process, the T-shaped punching cutter 621 will cooperate with the T-shaped cutting groove 611 to punch and form two L-shaped conductive foam shielding material products.

[0062] refer to Figure 8As shown, in order to achieve the traction of the bottom conductive foam shielding material and the two side conductive foam shielding materials, this application also includes a double-layer clamping conveyor mechanism 80. The double-layer clamping conveyor mechanism 80 is located between the cooling mechanism 50 and the slitting and punching mechanism. The double-layer clamping conveyor mechanism 80 includes a third mounting groove 13 opened on the support platform 10, a lower belt conveyor line 81 located inside the third mounting groove 13 and flush with the surface of the support platform 10, and an upper belt conveyor line 82 erected above the lower belt conveyor line 81. There is a gap (not shown) between the upper belt conveyor line 82 and the lower belt conveyor line 81 for the bottom conductive foam shielding material to pass through. In specific implementation, the middle part of the bottom conductive foam shielding material passing through the cooling mechanism 50 will pass through the upper belt conveyor line 82 and the lower belt conveyor line 81. With the cooperation of the upper belt conveyor line 82 and the lower belt conveyor line 81, the bottom conductive foam shielding material and the two side conductive foam shielding materials on both sides above it will move synchronously to the next station.

[0063] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process, characterized in that, The method includes a support platform, a raw material unwinding mechanism arranged sequentially on the support platform along a predetermined direction, a plasma treatment mechanism, an ultrasonic roll welding mechanism, a cooling mechanism, and a slitting and punching mechanism. The method specifically includes the following steps: The first step involves the unwinding mechanism releasing a bottom conductive foam shielding material, which is then plasma-sprayed onto its welding surface by a plasma treatment mechanism. The unwinding mechanism also releases two side conductive foam shielding materials, which are then plasma-sprayed onto their welding surfaces by a plasma treatment mechanism. These materials are then stacked on both sides above the bottom conductive foam shielding material. The second step involves the ultrasonic welding mechanism passing the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides. The side conductive foam shielding materials on both sides will be welded to the top two sides of the bottom conductive foam shielding material by the ultrasonic welding mechanism. The third step is that when the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides pass through the cooling mechanism, the cooling mechanism will cool down the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides. The fourth step involves the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides passing through a slitting and punching mechanism after the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides have been cooled. The slitting and punching mechanism cuts the bottom conductive foam shielding material and the side conductive foam shielding materials on both sides into two L-shaped conductive foam shielding materials.

2. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The two sides of the support platform are respectively equipped with inverted U-shaped angle steels for shielding two side conductive foam materials. The two inverted U-shaped angle steels are respectively provided with a first partition and a second partition for the ultrasonic rolling welding mechanism and the cooling mechanism. The raw material unwinding mechanism and the plasma treatment mechanism are respectively located at the front section of the two inverted U-shaped angle steels. The cutting and punching mechanism is located at the rear section of the two inverted U-shaped angle steels.

3. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The raw material unwinding mechanism includes a first servo unwinding frame located on one side of the support platform for releasing the bottom conductive foam shielding material, and two second servo unwinding frames located on the front sides of the first servo unwinding frame for releasing the side conductive foam shielding material.

4. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The plasma treatment mechanism includes a first isolation cover, a transverse support arm located inside the isolation cover, a first plasma nozzle located at the bottom of the transverse support arm for plasma spraying the bottom conductive foam shielding material, a U-shaped frame located on both sides of the inner top wall of the first isolation cover at the rear of the transverse support arm for the side conductive foam shielding material to pass through, two guide wheels located inside the two U-shaped frames for guiding the side conductive foam shielding material, and two second plasma nozzles located above the inner bottom wall of the two U-shaped frames for plasma spraying the two sides conductive foam shielding materials.

5. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The ultrasonic welding mechanism includes a first mounting groove opened at the first partition on the support platform, a bottom roller disposed inside the first mounting groove and flush with the surface of the support platform, and an ultrasonic welding roller rotatably mounted above the bottom roller.

6. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 5, characterized in that, The outer surface of the ultrasonic welding roller is formed with a knurled or textured structure.

7. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The cooling mechanism includes a second isolation cover located on a support platform at the first partition and a fan located on the inner wall of the second isolation cover.

8. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, The cutting and punching mechanism includes a second mounting groove on the support platform, a lower die located inside the second mounting groove, and an upper die corresponding to the lower die mounted above the support platform and lifted by a hydraulic cylinder.

9. A method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 8, characterized in that, The bottom of the upper die is provided with a T-shaped punch cutter, and the upper surface of the lower die is provided with a T-shaped cutting groove corresponding to the T-shaped punch cutter.

10. The method for preparing L-shaped conductive foam shielding material based on roll-to-roll continuous welding process according to claim 1, characterized in that, It also includes a double-layer clamping conveyor mechanism, which is located between the cooling mechanism and the slitting and punching mechanism. The double-layer clamping conveyor mechanism includes a third mounting groove on the support platform, a lower belt conveyor line located inside the third mounting groove and flush with the surface of the support platform, and an upper belt conveyor line erected above the lower belt conveyor line. There is a gap between the upper belt conveyor line and the lower belt conveyor line for the bottom conductive foam shielding material to pass through.

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