A laminating die cutting apparatus for multi-layered graphite sheet composite

Abstract

The application provides a laminating and die-cutting device for multilayer graphite sheet composite, comprising a main body, a pressing assembly, an exhaust assembly, a shape cutting assembly, a driving assembly and an adjusting runner. The cavity of the pressing assembly is for three-layer film sheet to pass through and be pressed. The exhaust assembly discharges the air in the cavity to form negative pressure through the movement of the piston. The driving assembly drives the sheet to move and drives the adjusting runner to rotate. The adjusting runner drives the shape cutting assembly to ascend and descend to cut the film sheet through the regular polygonal sliding groove. The ascending and descending movement of the shape cutting assembly links the reciprocating movement of the piston of the exhaust assembly. The application integrates the functions of lamination, exhaust and die-cuting, effectively eliminates the bubbles of the composite sheet in the negative pressure environment, improves the heat dissipation performance and appearance quality of the composite sheet, flexibly adjusts the die-cutting frequency and stroke by replacing the adjusting runner with different groove types, improves the adaptability and production efficiency of the equipment to different specifications of products, and solves the problems of complicated transfer, poor alignment accuracy and low efficiency caused by process separation in the traditional process.

Description

Technical Field

[0001] This invention relates to the field of graphite sheet processing equipment, specifically to a bonding and die-cutting device for multi-layer graphite sheet composites. Background Technology

[0002] Against the backdrop of the rapid development of the 3C consumer electronics industry (such as smartphones, tablets, and laptops), the heat dissipation problem of electronic components has become increasingly prominent. Graphite sheets are widely used as heat dissipation materials due to their excellent thermal conductivity. In actual production applications, bare graphite materials usually need to be multi-layered with a base film and a matte black film, and then die-cut into specific shapes to fit the compact layout space of electronic components.

[0003] Currently, existing graphite sheet processing technologies typically separate the lamination and die-cutting processes. First, multiple layers of material are pressed together using lamination equipment, then transferred to a die-cutting machine for shaping. This step-by-step approach not only results in large equipment footprints but also increases the risk of material misalignment due to multiple transfers, reducing product precision. Furthermore, traditional lamination devices lack effective venting methods during the lamination process, leading to air bubbles remaining between layers, affecting the heat dissipation and appearance quality of the graphite sheets. In the die-cutting stage, existing die-cutting equipment often struggles to flexibly adjust the die's downward stroke and cutting frequency according to different product specifications, resulting in poor versatility. Additionally, improper tension control during the removal of waste film after die-cutting (such as matte black film waste) can easily cause the fragile graphite sheets to break or wrinkle, increasing the scrap rate.

[0004] For example, Chinese invention patent CN118321877B discloses a graphite sheet assembly mechanism, including a mechanism body. The mechanism body includes a pressing device, a positioning device disposed below the pressing device, and a conveying device for conveying the positioning device. The pressing device includes a bracket, a pressing assembly connected above the bracket, and a lifting assembly disposed below the positioning device. The pressing assembly is used for pressing the graphite sheet and the product together, and the lifting assembly is used to drive the lifting and lowering of the positioning device. The purpose of this invention is to provide a graphite sheet assembly mechanism that improves the bonding accuracy.

[0005] Therefore, developing a composite bonding and die-cutting device that integrates efficient bonding, venting, die-cutting, and film removal, and allows for flexible adjustment of process parameters, is a technical problem that urgently needs to be solved in the current 3C electronic auxiliary material processing field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a bonding and die-cutting device for multi-layer graphite sheet lamination, thereby solving the technical problems mentioned in the background section of the prior art, such as incomplete air bubble removal and difficulty in adjusting die-cutting parameters during the bonding process of multi-layer graphite sheet lamination and die-cutting.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a bonding and die-cutting device for multilayer graphite sheet composites, comprising: main body; A pressing assembly is disposed on the main body. The pressing assembly includes a chamber. Three feed slots are opened on one side of the chamber and a discharge slot is opened on the other side. The matte black film, the graphite bare material sheet and the base film can pass through the three feed slots respectively into the chamber and be initially pressed into a composite sheet before being discharged from the discharge slot. An exhaust assembly is disposed on one side of the pressing assembly, and the exhaust assembly is capable of venting air from the chamber; A cutting assembly is arranged on the main body and located on one side of the discharge chute. The cutting assembly is slidably connected to the exhaust assembly. The pre-pressed composite sheet can enter the cutting assembly, which can cut the matte black film and the bare graphite sheet in the composite sheet. A drive assembly, arranged on the main body and located on one side of the material outlet of the forming and cutting assembly, is connected to the forming and cutting assembly and can drive the forming and cutting assembly to perform lifting and lowering movements. The lifting and lowering movements of the forming and cutting assembly can drive the exhaust assembly to perform reciprocating linear movements. The composite sheet cut by the drive assembly can pass through the drive assembly and be driven forward by it. An adjusting wheel is installed on the cutting assembly. The adjusting wheel is designed as a replacement part. Different adjusting wheels have different regular polygonal sliding grooves. The regular polygonal sliding grooves are slidably connected to the cutting assembly.

[0008] Furthermore, a film-peeling assembly is also provided, the film-peeling assembly comprising: A first motor is fixedly mounted on the main body. The first motor has a built-in tension sensor, which adjusts the rotational speed of the first motor according to the magnitude of the tension acting on it. A winding rod is rotatably mounted on the main body and coaxially fixedly mounted on the output shaft of the first motor. One end of the torn-off matte black film can be wound onto the winding rod.

[0009] Furthermore, the number of sides of the regular polygonal slide controls the frequency of the lifting and lowering movement of the cutting component, and the radius of the inscribed circle of the regular polygonal slide controls the maximum descent height of the cutting component.

[0010] Furthermore, the pressing assembly also includes: There are two first pressing rollers, both of which are rotatably arranged in the cavity. The first pressing rollers are made of flexible material, and the cylindrical surfaces of the two first pressing rollers are in contact with each other. The matte black film, the graphite bare material sheet and the base film can pass through the contact point between the cylindrical surfaces of the first pressing rollers.

[0011] Furthermore, the exhaust assembly includes: A piston component is fixedly mounted on the main body, and a piston chamber is provided inside the piston component. A vent hole is provided at one end of the piston component. The piston rod has one end in a sealed sliding connection with the piston chamber, and the other end has a groove. There are two one-way valves. One is an intake one-way valve installed at the end of the piston near the chamber to connect the chamber and the piston cavity. The other is an exhaust one-way valve installed at the end of the piston away from the chamber.

[0012] Furthermore, the cutting component includes: The pressure block is vertically and can be arranged on the main body; A ring-shaped blade, disposed on one side of the pressure block, is designed to conform to the outline of the graphite sheet to be cut; and A connecting rod is fixedly disposed on one side of the pressure block. A first sliding bar is arranged at the end of the connecting rod away from the pressure block. The first sliding bar is slidably connected to a regular polygonal sliding groove.

[0013] Furthermore, the driving component includes: A roller bonding mechanism is provided on the main body. The roller bonding mechanism can be passed through and abutted against by the composite sheet. When the roller bonding mechanism rotates, it can drive the composite sheet to move. A drive shaft, rotatably mounted on the main body and located on the side of the rolling mechanism near the forming assembly, has a second gear fixedly mounted at one end of the drive shaft, the second gear meshing with the rolling mechanism; and A drive turntable is coaxially fixed at the end of the transmission shaft away from the second gear. A second slide bar is disposed on the drive turntable, and the second slide bar is slidably connected to the slide groove.

[0014] Furthermore, the roller-forming mechanism includes: There are two rollers, both of which are rotatably and symmetrically arranged on the main body; Two first gears are provided, each coaxially fixed to one end of one of the two rollers, and the two first gears mesh with each other; and The second motor is fixedly installed on the main body, and the output shaft of the second motor is coaxially and fixedly connected to the roller.

[0015] Furthermore, the roller is provided with a clearance groove, the width of which is the same as the width of the matte black film and the bare graphite sheet cut from the composite sheet.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention integrates a pressing component, an exhaust component, a cutting component, and a driving component on the main body, realizing the integrated operation of feeding, bonding, die-cutting, and unloading of multi-layer graphite sheets. This effectively solves the problems of cumbersome transfer, poor alignment accuracy, and low efficiency caused by the separation of processes in traditional processes. By connecting the exhaust component to the chamber, the negative pressure generated by the reciprocating motion of the piston is used to expel the air in the chamber, so that the matte black film, the bare graphite sheet, and the base film are pressed together in a near-vacuum environment, effectively preventing the generation of interlayer bubbles and improving the heat dissipation performance and appearance quality of the composite sheet.

[0017] 2. The drive assembly of this invention, through a transmission shaft and a drive turntable, drives the roller feeding mechanism to convey the sheet material on one hand, and drives the forming and cutting assembly to perform lifting and lowering movements on the other hand by adjusting the regular polygonal groove of the rotating wheel, thus achieving precise synchronization between conveying and die-cutting. Simultaneously, the adjusting wheel is designed as a replaceable part; by replacing the wheel with a regular polygonal groove having a different number of sides or an inscribed circle radius, the lifting frequency and maximum descent height of the forming and cutting assembly can be easily adjusted, improving the equipment's adaptability and versatility to products of different specifications. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of the overall structure of a bonding and die-cutting device for multilayer graphite sheet composite provided by the present invention; Figure 2 A cross-sectional view of a bonding and die-cutting device for multilayer graphite sheet lamination provided by the present invention; Figure 3 A cross-sectional view of an exhaust assembly in a bonding and die-cutting device for multilayer graphite sheet lamination provided by the present invention; Figure 4 Rear view of a bonding and die-cutting device for multilayer graphite sheet lamination provided by the present invention; Figure 5 An exploded view of a forming and cutting component in a bonding and die-cutting device for multilayer graphite sheet composites, provided by the present invention; Figure 6 The image shows a front view of a replacement part for an adjusting roller in a bonding and die-cutting device for multilayer graphite sheet lamination, provided by the present invention.

[0020] Figure label: 101. Main body; 102. Chamber; 103. Feed chute; 104. Discharge chute; 105. Matte black diaphragm; 106. Bare graphite sheet; 107. Base film; 108. Adjusting wheel; 109. Regular polygonal slide. 201. First motor; 202. Rewinding bar; 203. First pressing roller; 204. Piston component; 205. Piston chamber; 206. Vent hole; 207. Piston rod; 208. Slide groove; 209. One-way valve; 301. Pressing block; 302. Ring blade; 303. Connecting rod; 304. First sliding bar; 305. Drive shaft; 306. Second gear; 307. Drive turntable; 308. Second sliding bar; 309. Roller; 310. First gear; 311. Second motor; 312. Alternating groove. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0022] Example:

[0023] like Figure 1 and Figure 2 As shown, this invention provides a bonding and die-cutting device for multilayer graphite sheet composites, including a main body 101, a pressing assembly, an venting assembly, a cutting assembly, a driving assembly, and an adjusting wheel 108. The pressing assembly is mounted on the main body 101 and includes a chamber 102. Three inlet slots 103 are provided on one side of the chamber 102, and an outlet slot 104 is provided on the other side. In actual production, a matte black film 105, a bare graphite sheet 106, and a base adhesive sheet 107 enter the chamber 102 through the three inlet slots 103, respectively. The pressing assembly also includes two first pressing rollers 203, both rotatably arranged within the chamber 102, and made of a flexible material (such as silicone or rubber). The cylindrical surfaces of the two first pressing rollers 203 are bonded together. The three layers of material pass through the bonding area of ​​the two first pressing rollers 203 and are initially pressed into a composite sheet under pressure, which is then discharged from the outlet slot 104.

[0024] like Figure 2As shown, the exhaust assembly is located on one side of the pressing assembly and is used to exhaust air from the chamber 102 to create a negative pressure environment. The exhaust assembly includes a piston 204, which is fixed to the main body 101 and has a piston chamber 205 inside. One end of the piston 204 has a vent hole 206. One end of the piston rod 207 is slidably connected to the piston chamber 205, and the other end has a groove 208 perpendicular to the direction of movement of the piston rod 207. Two one-way valves 209 are provided on the piston 204. One intake one-way valve 209 is installed at the end of the piston 204 near the chamber 102, connecting the chamber 102 and the piston chamber 205. The other exhaust one-way valve 209 is installed at the end of the piston 204 away from the chamber 102. When the piston rod 207 reciprocates, the air in the chamber 102 is extracted and discharged through the one-way valve 209, thereby achieving negative pressure bonding. (It should be noted that the stroke of the piston rod 207 is less than the depth of the chamber 102, meaning that the piston rod 207 does not reach the deepest part of the chamber 102 completely, but actually reaches about halfway. This is because the present invention does not aim to achieve bonding in a vacuum environment, but rather to reduce the generation of air bubbles by reducing the air in the chamber 102. Considering that the thin graphite sheet 106 will wrinkle in a vacuum, the present invention aims to achieve a balance between reducing air bubbles in a negative pressure environment and preventing wrinkles in the graphite sheet 106 under negative pressure. Therefore, half the volume of the chamber 102 is reserved as a compression buffer. That is, when the negative pressure in the chamber 102 and the suction generated by the stroke of the piston rod 207 are equal, the graphite sheet 106 will not wrinkle, and air bubbles will be generated as little as possible during the bonding process.)

[0025] like Figure 2 and Figure 4As shown, the cutting assembly is arranged on the main body 101 and located on one side of the discharge trough 104. It includes a pressing block 301 that can be raised and lowered on the main body 101, and an annular blade 302 disposed on one side of the pressing block 301. The shape of the annular blade 302 is consistent with the outline of the graphite sheet to be cut. A connecting rod 303 is fixedly disposed on one side of the pressing block 301, and a first sliding bar 304 is disposed at the end away from the pressing block 301. The driving assembly is arranged on the main body 101 and located on the discharge end side of the cutting assembly. It includes a roller clamping mechanism, a transmission shaft 305, and a drive turntable 307. The roller clamping mechanism includes two rotatably symmetrically arranged rollers 309 on the main body 101. Two first gears 310 are coaxially fixedly disposed at one end of the two rollers 309 and mesh with each other. A second motor 311 is fixedly mounted on the main body 101, and its output shaft is coaxially fixedly connected to one of the rollers 309. The drive shaft 305 is rotatably arranged on the main body 101 and located on the side of the roller forming mechanism near the forming and cutting assembly. A second gear 306 is fixedly installed at one end of the drive shaft 305, which meshes with the gear on the roller forming mechanism (i.e., the first gear 310). The drive turntable 307 is coaxially fixed at the end of the drive shaft 305 away from the second gear 306, and a second slide bar 308 is provided on the drive turntable 307.

[0026] like Figure 4 and Figure 5 As shown, the adjusting wheel 108 is fixedly mounted on the cutting assembly and rotates together with the drive shaft 305. It is designed as a detachable replacement part and has a regular polygonal groove 109 on it. The first sliding rod 304 is slidably connected to the regular polygonal groove 109, while the second sliding rod 308 is slidably connected to the groove 208 on the piston rod 207.

[0027] The working principle is as follows: The second motor 311 is started, driving the roller 309 to rotate, thereby moving the composite sheet. Simultaneously, the power of the roller 309 is transmitted to the drive shaft 305 via gear transmission, driving the drive turntable 307 to rotate. When the drive turntable 307 rotates, the second sliding bar 308 on it slides within the groove 208 of the piston rod 207, driving the piston rod 207 to perform reciprocating linear motion, thus achieving the vacuuming action of the exhaust assembly. Furthermore, the power of the drive turntable 307 also drives the adjusting wheel 108 to rotate, utilizing the contour change of the regular polygonal groove 109 to drive the first sliding bar 304 and connecting rod 303 to move the pressure block 301 up and down. When the pressure block 301 descends, the annular blade 302 cuts the matte black film 105 and the bare graphite sheet 106 in the composite sheet.

[0028] like Figure 6As shown, by replacing the adjusting wheel 108 of different specifications, the frequency of the lifting and lowering movement of the cutting component is controlled by the number of sides of the regular polygonal slide 109, and the maximum descent height of the cutting component is controlled by the radius of the inscribed circle of the regular polygonal slide 109, thereby adapting to different processing requirements.

[0029] To protect the matte black film 105 and the bare graphite sheet 106 in the composite sheet cut by the annular blade 302, a clearance groove 312 is also provided on the roller 309. The width of the clearance groove 312 is the same as the width of the matte black film 105 and the bare graphite sheet 106 cut on the composite sheet. When the cutting part passes the roller 309, it avoids hard contact with the surface of the roller 309, which would cause displacement between the matte black film 105 and the bare graphite sheet 106.

[0030] like Figure 1 As shown, this device also includes a film-tearing assembly, comprising a first motor 201 and a winding rod 202. The first motor 201 is fixedly mounted on the main body 101 and has a built-in tension sensor that can adjust its rotation speed in real time according to the magnitude of the applied tension. The winding rod 202 is coaxially fixedly mounted on the output shaft of the first motor 201 and is used to wind up the torn matte black film 105 and graphite bare sheet 106 waste. Constant tension control ensures the smoothness of the film-tearing process.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above. Modifications or improvements can be made to the present invention, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A bonding and die-cutting device for multilayer graphite sheet lamination, characterized in that, Including: main body; A pressing assembly is disposed on the main body. The pressing assembly includes a chamber. Three feed slots are opened on one side of the chamber and a discharge slot is opened on the other side. The matte black film, the graphite bare material sheet and the base film can pass through the three feed slots respectively into the chamber and be pressed into a composite sheet before being discharged from the discharge slot. An exhaust assembly is disposed on one side of the pressing assembly, and the exhaust assembly is capable of venting air from the chamber; A cutting assembly is arranged on the main body and located on one side of the discharge chute. The cutting assembly is slidably connected to the exhaust assembly. The pre-pressed composite sheet can enter the cutting assembly, which can cut the matte black film and the bare graphite sheet in the composite sheet. A drive assembly is arranged on the main body and located on one side of the material discharge end of the forming and cutting assembly. The drive assembly is connected to the forming and cutting assembly and can drive the forming and cutting assembly to perform lifting and lowering movements. The lifting and lowering movements of the forming and cutting assembly can drive the exhaust assembly to perform reciprocating linear movements. The composite sheet cut by the drive assembly can pass through the drive assembly and be driven forward by it. and An adjusting wheel is installed on the cutting assembly. The adjusting wheel is designed as a replacement part. Different adjusting wheels have different regular polygonal sliding grooves. The regular polygonal sliding grooves are slidably connected to the cutting assembly.

2. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 1, characterized in that... A film-peeling assembly is also provided, the film-peeling assembly comprising: A first motor is fixedly mounted on the main body. The first motor has a built-in tension sensor, which adjusts the rotational speed of the first motor according to the magnitude of the tension acting on it. A winding rod is rotatably mounted on the main body and coaxially fixed on the output shaft of the first motor. One end of the torn-off matte black film and graphite bare material sheet can be wound onto the winding rod.

3. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 1, characterized in that: The number of sides of the regular polygonal slide controls the frequency of the lifting and lowering movement of the cutting component, and the radius of the inscribed circle of the regular polygonal slide controls the maximum descent height of the cutting component.

4. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 1, characterized in that, The pressing assembly further includes: There are two first pressing rollers, both of which are rotatably arranged in the cavity. The first pressing rollers are made of flexible material, and the cylindrical surfaces of the two first pressing rollers are in contact with each other. The matte black film, the graphite bare material sheet and the base film can pass through the contact point between the cylindrical surfaces of the first pressing rollers.

5. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 1, characterized in that, The exhaust assembly includes: A piston component is fixedly mounted on the main body, and a piston chamber is provided inside the piston component. A vent hole is provided at one end of the piston component. The piston rod has one end in a sealed sliding connection with the piston chamber, and the other end has a groove. There are two one-way valves. One is an intake one-way valve installed at the end of the piston near the chamber to connect the chamber and the piston cavity. The other is an exhaust one-way valve installed at the end of the piston away from the chamber.

6. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 1, characterized in that, The cutting component includes: The pressure block is vertically and can be arranged on the main body; A ring-shaped blade, disposed on one side of the pressure block, is designed to conform to the outline of the graphite sheet to be cut; and A connecting rod is fixedly disposed on one side of the pressure block. A first sliding bar is arranged at the end of the connecting rod away from the pressure block. The first sliding bar is slidably connected to a regular polygonal sliding groove.

7. A bonding and die-cutting device for multilayer graphite sheet composites according to claim 5, characterized in that, The driving component includes: A roller bonding mechanism is provided on the main body. The roller bonding mechanism can be passed through and abutted against by the composite sheet. When the roller bonding mechanism rotates, it can drive the composite sheet to move. A drive shaft, rotatably mounted on the main body and located on the side of the rolling mechanism near the forming assembly, has a second gear fixedly mounted at one end of the drive shaft, the second gear meshing with the rolling mechanism; and A drive turntable is coaxially fixed at the end of the transmission shaft away from the second gear. A second slide bar is disposed on the drive turntable, and the second slide bar is slidably connected to the slide groove.

8. The bonding and die-cutting device for multilayer graphite sheet composite according to claim 7, characterized in that, The rolling mechanism includes: Two rollers are provided, both of which are rotatably and symmetrically arranged on the main body; Two first gears are provided, each coaxially fixed to one end of one of the two rollers, and the two first gears mesh with each other; and The second motor is fixedly installed on the main body, and the output shaft of the second motor is coaxially and fixedly connected to the roller.

9. A bonding and die-cutting device for multilayer graphite sheet composites according to claim 8, characterized in that, The roller is also provided with a clearance groove, the width of which is the same as the width of the matte black film and the bare graphite sheet cut from the composite sheet.

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