Graphite sheet edge wrapping die-cutting equipment and die-cutting process

Abstract

The present invention discloses a graphite sheet edge wrapping die-cutting device and a die-cutting process, and relates to the technical field of die-cutting equipment. The present invention proposes a corresponding transmission structure for the edge wrapping action in the die-cutting process of thermal conductive graphite film, and adds a stop roller and a lower support roller respectively in combination with the transmission process of the original film body during the edge wrapping process. Specifically, the stop roller cooperates with the transmission action of the original film body to perform a continuous differential rotation action, and realizes the clamping or relaxation of the original film body without interfering with the transmission process of the original film body. The lower support roller is used to increase or reduce the tension value on the original film body, and further limit the position of the stop roller and the lower support roller relative to the first-order roller, and cooperate with the movement stroke of the punching cutting head in the overall die-cutting process to limit the stop roller and the lower support roller to perform appropriate movement, the purpose of which is to cooperate with the "stabilization" of the transmission state of the original film body.

Description

Technical Field

[0001] The present invention relates to the technical field of die-cutting equipment, and in particular to a graphite sheet edge wrapping die-cutting equipment and a die-cutting process. Background Art

[0002] Thermally conductive graphite sheet, also known as thermally conductive graphite film, is a new type of thermally conductive and heat dissipating material that is suitable for uniform heat conduction on any surface and has EMI electromagnetic shielding effect. Its production process is mainly based on die-cutting technology. Specifically combined with the edge-wrapping die-cutting process of the graphite sheet, it is explained as follows: two PET original films are attached to the two sides of the protective film, and hot pressing or cold pressing is used to make the PET original film fully adhere to the protective film to complete the edge-wrapping process.

[0003] It should be noted that the narrow width and thin thickness of the original PET film predispose it to breakage, deformation, and other abnormalities when subjected to high tension. Because the die-cutting process uses continuous material conveyance, high tension (tension) on the original PET film can directly cause these abnormalities. Even low tension can affect the adhesion of the original PET film to the protective film, resulting in wrinkles, misalignment, and pores.

[0004] It is further explained that during the transmission of the material strip, it goes through two steps, namely the first punching and cutting and the second punching and cutting. In the above two steps, the material strip is in a state of short-term interruption of transmission, which will indirectly cause the tension on the original PET film to change. Summary of the Invention

[0005] The purpose of the present invention is to provide a graphite sheet edge wrapping die-cutting device and die-cutting process, which is used to solve the problem that the tension on the PET original film changes non-directionally in actual situations, affecting the overall edge wrapping process.

[0006] The object of the present invention can be achieved by the following technical solution: A graphite sheet edge wrapping die-cutting device, comprising a working frame, a punching and cutting head, a protective film body, a graphite sheet, a drive motor group and two original film bodies, wherein the working frame is provided with a front roller, a first-order roller, a second-order roller, a third-order roller and a fourth-order roller in sequence along the transmission direction of the protective film body, and the transmission direction of the protective film body is from left to right;

[0007] The working frame plate is respectively provided with a stop roller, a first transfer roller and a second transfer roller at the upper positions corresponding to the first-order roller, the second-order roller and the fourth-order roller, and a lower supporting roller is provided in the middle of the first-order roller and the second-order roller, and the lower supporting roller is located on the upper side of the protective film body;

[0008] The original film body is sequentially wound around the lower side of the first transfer roller, the upper side of the first-step roller and the upper side of the lower supporting roller, the stopping roller is tangent to the first-step roller, the first-step roller and the lower supporting roller are provided with limiting material grooves corresponding to the original film body, a plurality of inner pressure arc blocks corresponding to the limiting material grooves are installed on the circumferential outer wall of the stopping roller, the plurality of inner pressure arc blocks are arranged in a ring array along the center point of the stopping roller, and the outer curved surface of the inner pressure arc block is tangent to the inner groove surface of the limiting material groove;

[0009] A support block is installed at the position of the working frame plate corresponding to the lower roller shaft, and connecting blocks are rotatably installed at both ends of the lower roller shaft. A compensation slide corresponding to the connecting block is opened on the support block, and the compensation slide is vertically arranged. An electric push rod is installed at the position of the working frame plate corresponding to the support block, and a mounting seat is installed at the top of the transmission rod of the electric push rod, and a pressure sensor is installed on the mounting seat, and the top of the transmission rod of the pressure sensor is connected to the connecting block.

[0010] It is further configured that: the number of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller is two, and the protective film body is located in the middle position of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller.

[0011] It is further configured that the arc length between the internal pressure arc blocks at every two adjacent positions matches the movement stroke of the protective film body.

[0012] It is further configured as follows: the two original film bodies are symmetrically arranged along the width direction of the protective film body, and the graphite sheet is located in the middle of the two original film bodies.

[0013] It is further configured that the lengths of the front roller, the first-order roller, the second-order roller, the third-order roller and the fourth-order roller are greater than the length of the protective film body.

[0014] It is further configured that: the rotation direction of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller located at the upper side is counterclockwise, and the rotation direction of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller located at the lower side is clockwise;

[0015] The rotation direction of the stop roller is clockwise.

[0016] It is further configured as follows: the radial distance between the lower roller shaft and the first-order roller shaft and the second-order roller shaft is equal, and the center point height of the lower roller shaft is higher than the center point height of the first-order roller shaft and the second-order roller shaft, and the lower roller shaft does not contact the protective film body.

[0017] It is further configured as follows: a pressure roller is installed on the circumferential outer wall of the original film body corresponding to the second-order roller and the third-order roller, the pressure roller is tangent to the protective film body, and the width of the pressure roller on the second-order roller is equal to the width of the original film body, the width of the pressure roller on the third-order roller is greater than the width of the original film body, and the fourth-order roller is tangent to the protective film body.

[0018] It is further configured as follows: an external empty tube is installed on the outer wall of the support block close to the second-order roller, the installation direction of the external empty tube is parallel to the width direction of the protective film body, and an atomizing nozzle corresponding to the original film body is installed on the external empty tube.

[0019] It is further configured as follows: the width of the atomizing nozzle is equal to the width of the original film body, and the atomizing nozzle is located in the middle of the original film body and the protective film body.

[0020] It is further configured as follows: the graphite sheet is sequentially wound around the lower side of the second transfer roller and the middle position of the two fourth-step rollers.

[0021] A graphite sheet edge wrapping die-cutting process, comprising a tension control stage, an interruption and stopping stage, and a linkage stage:

[0022] Tension control stage: an electric push rod, lower idler shaft and pressure sensor are used, and the critical tension value of the original film body is preset. The upward movement of the lower idler shaft is set as the tension increasing state, and the downward movement of the lower idler shaft is set as the tension decreasing state. The tension balance value is calculated based on the initial position parameters of the first-order roller shaft, the lower idler shaft and the second-order roller shaft, as well as the traction force during the transmission of the protective film body;

[0023] Interrupted stopping stage: The protective film body is intermittently transported from left to right according to the movement stroke of the punching and cutting head, which is converted into the size parameters between each internal pressure arc block. The first-order roller, second-order roller, third-order roller, fourth-order roller, first transfer roller and second transfer roller cooperate with the intermittent transmission action of the protective film body to perform intermittent rotation action, and the stop roller performs continuous differential rotation action;

[0024] Linkage stage: The linkage stage is used to coordinate the tension control stage and the transfer stop module, and specifically includes the following steps:

[0025] S1: When the protective film body is in the process of interrupting transmission, a punching and cutting head performs a punching and cutting action on the protective film body, and the lower roller shaft is pushed upward by the electric push rod, entering the tension increase state in the tension control stage. The outer curved surface of one of the inner pressure arc blocks is tangent to the inner groove surface of the limiting material groove in the first-order roller shaft, and the stop roller shaft performs a clamping and stopping action on the original film body;

[0026] S2: After the punching head completes the punching action and the stop roller continues to rotate, the inner pressure arc block does not contact the inner groove surface of the limit groove in the step roller, and the original film body returns to the normal transmission process. The electric push rod pushes the lower roller shaft downward to enter the tension reduction state in the tension control stage;

[0027] S3: In S1 and S2, the value on the pressure sensor is set to be greater than the tension balance value and less than the critical tension value, and the tension difference rate is preset in the linkage stage, the tension difference rate is 0.15, and the movement stroke of the electric push rod in the tension increase state and the tension reduction state is controlled by the tension difference rate.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention is aimed at the hemming process in the die-cutting process of thermal conductive graphite film, and specifically plans the transmission roller group therein, and specifically realizes the transmission and bonding process of the original film body and the protective film body through the stop roller, the first-order roller, the lower support roller and the second-order roller. On this basis, the stop roller is used as the "stop" structure in the transmission and bonding process, and the lower support roller is used as the "stabilization" structure, which is specifically manifested as follows: the internal pressure arc block on the stop roller realizes the clamping or relaxation of the original film body according to the movement stroke of the punching and cutting head, and the lower support roller is used to increase or reduce the tension on the original film body. Its purpose is to cooperate with the overall transmission process to stabilize the tightness of the original film body, and avoid abnormal problems such as relaxation and falling of the original film body that affect the bonding state.

[0030] 2. It is further explained that: first, the setting positions of the stopping roller and the lower supporting roller are limited, and the stopping roller and the lower supporting roller are set at both sides of the first-order roller. The purpose is to simultaneously "stabilize" the original film body wound on both sides of the first-order roller. Then, the size parameters of the internal pressure arc block are limited. Specifically, the arc length of the spacing between each two adjacent internal pressure arc blocks is set to be equal to the movement stroke of a punching cutting head. The purpose is to form a continuous differential rotation action of the stopping roller, to ensure that there will be no "fault" problem of "stable" action during the overall transmission process, and to further promote the stable state of the protective film body during transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1This is a schematic structural diagram of a graphite sheet edge wrapping die-cutting device proposed by the present invention;

[0033] Figure 2 This is a cross-sectional view of a working frame component in a graphite sheet edge wrapping die-cutting device proposed by the present invention;

[0034] Figure 3 This is a schematic diagram of the transmission of a protective film component in a graphite sheet edge wrapping die-cutting device proposed by the present invention;

[0035] Figure 4 This is a schematic structural diagram of a stop roller component in a graphite sheet edge wrapping die-cutting device proposed by the present invention;

[0036] Figure 5 This is a schematic structural diagram of the lower roller shaft component in a graphite sheet edge wrapping die-cutting device proposed in the present invention.

[0037] Figure 6 This is a front view of a stop roller component in a graphite sheet edge wrapping die-cutting device proposed by the present invention.

[0038] In the figure: 1. Working frame; 2. Driving motor group; 3. Protective film body; 4. Stop roller; 5. Original film body; 6. First transfer roller; 7. Graphite sheet; 8. Second transfer roller; 9. First punch cutting head; 10. Front roller; 11. Internal pressure arc block; 12. First-step roller; 13. Electric push rod; 14. Second-step roller; 15. Third-step roller; 16. Fourth-step roller; 17. Lower roller; 18. Pressure roller; 19. Support block; 20. Limiting trough; 21. Mounting seat; 22. Connecting block; 23. Compensating slide; 24. Pressure sensor; 25. External empty pipe; 26. Atomizing nozzle. DETAILED DESCRIPTION

[0039] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example 1

[0041] In the die-cutting and hemming process of thermal conductive graphite film production, because the original film (PET film) is small in width and thin in thickness, abnormal problems such as breakage and deformation may occur when its tension changes too much. If its tension is too low, it will affect the actual state of the PET film being attached to the protective film, such as wrinkles, deviations, and air holes. To solve this problem, the following technical solutions are proposed:

[0042] Reference Figures 1 to 5In this embodiment, a graphite sheet hemming die-cutting device includes a work frame 1, a punching and cutting head 9, a protective film body 3, a graphite sheet 7, a drive motor unit 2, and two original film bodies 5. The work frame 1 is provided with a front roller 10, a first-stage roller 12, a second-stage roller 14, a third-stage roller 15, and a fourth-stage roller 16 in the conveying direction of the protective film body 3. The conveying direction of the protective film body 3 is from left to right.

[0043] The working frame plate 1 is provided with a stop roller 4, a first transfer roller 6 and a second transfer roller 8 on the upper side corresponding to the first-step roller 12, the second-step roller 14 and the fourth-step roller 16, respectively. A lower supporting roller 17 is provided between the first-step roller 12 and the second-step roller 14. The lower supporting roller 17 is located on the upper side of the protective film body 3.

[0044] The original film body 5 is sequentially wound around the lower side of the first transfer roller 6, the upper side of the first-step roller 12 and the upper side of the lower supporting roller 17. The stop roller 4 is tangent to the first-step roller 12. The first-step roller 12 and the lower supporting roller 17 are provided with a limiting material groove 20 corresponding to the original film body 5. A plurality of inner pressure arc blocks 11 corresponding to the limiting material groove 20 are installed on the outer circumferential wall of the stop roller 4. The plurality of inner pressure arc blocks 11 are arranged in a ring array along the center point of the stop roller 4, and the outer curved surface of the inner pressure arc block 11 is tangent to the inner groove surface of the limiting material groove 20.

[0045] A support block 19 is installed at the position of the working frame plate 1 corresponding to the lower roller shaft 17, and connecting blocks 22 are rotatably installed at both ends of the lower roller shaft 17. A compensation slide 23 corresponding to the connecting block 22 is opened on the support block 19, and the compensation slide 23 is vertically arranged. An electric push rod 13 is installed at the position of the working frame plate 1 corresponding to the support block 19, and a mounting seat 21 is installed at the top of the transmission rod of the electric push rod 13. A pressure sensor 24 is installed on the mounting seat 21, and the top of the transmission rod of the pressure sensor 24 is connected to the connecting block 22.

[0046] The two original film bodies 5 are symmetrically arranged along the width direction of the protective film body 3, and the graphite sheet 7 is located in the middle of the two original film bodies 5. The graphite sheet 7 is sequentially wound on the lower side of the second transfer roller 8 and the middle position of the two fourth-step rollers 16.

[0047] Operating principle: First, the production process of thermal conductive graphite film is explained, and the specific reference is Figure 3, first, the protective film body 3 is passed through the first-step roller 12, the second-step roller 14, the third-step roller 15 and the fourth-step roller 16 in sequence from left to right. When passing through the first-step roller 12, the original film body 5 to be bonded on the first transfer roller 6 is transferred to the upper side of the protective film body 3, and then rolled by the second-step roller 14 and the third-step roller 15, so that the original film body 5 is bonded to the two sides of the protective film body 3. Then, the graphite sheet 7 is transferred to the upper side of the protective film body 3 by the second transfer roller 8, and is located in the middle position of the two original film bodies 3. Finally, it is punched by a punching head 9. The above process is the basic structure in the hemming process, and the transmission process, driving process and punching process of the punching head 9 are not described in detail.

[0048] What needs to be explained is that: in the process of winding the original film body 5 and attaching it to the protective film body 3, what is different from the current structure is that a stop roller 4 and a lower support roller 17 are added, wherein the stop roller 4 does not actively participate in the transmission process of the original film body 5, but participates in the clamping or relaxation of the original film body 5 during the transmission process. Specifically, the internal pressure arc block 11 therein applies pressure to the original film body 5, and the lower support roller 17 is a "participant" of the original film body 5, but the lower support roller 17 does not rotate, but supports and presses from the bottom side of the original film body 5. Its purpose is to stabilize the transmission state of the original film body 5.

[0049] Example 2

[0050] In combination with the technical solution in Example 1, the following technical improvements are made to the brake roller and the lower support roller: the number of the first-order roller 12, the second-order roller 14, the third-order roller 15 and the fourth-order roller 16 is two, and the protective film body 3 is located in the middle position of the first-order roller 12, the second-order roller 14, the third-order roller 15 and the fourth-order roller 16. The arc length between the internal pressure arc blocks 11 at each two adjacent positions matches the movement stroke of the protective film body 3, and the length of the front roller 10, the first-order roller 12, the second-order roller 14, the third-order roller 15 and the fourth-order roller 16 is greater than the length of the protective film body 3.

[0051] The first-step roller 12, the second-step roller 14, the third-step roller 15 and the fourth-step roller 16 located at the upper side rotate in a counterclockwise direction, and the first-step roller 12, the second-step roller 14, the third-step roller 15 and the fourth-step roller 16 located at the lower side rotate in a clockwise direction;

[0052] The rotation direction of the stop roller shaft 4 is clockwise.

[0053] The radial distance between the lower roller shaft 17 and the first-order roller shaft 12 and the second-order roller shaft 14 is equal, and the center point height of the lower roller shaft 17 is higher than the center point height of the first-order roller shaft 12 and the second-order roller shaft 14, and there is no contact between the lower roller shaft 17 and the protective film body 3.

[0054] The second-step roller 14 and the third-step roller 15 are provided with pressure rollers 18 on the circumferential outer walls of the original film body 5 , which are tangent to the protective film body 3 . The width of the pressure roller 18 on the second-step roller 14 is equal to the width of the original film body 5 , and the width of the pressure roller 18 on the third-step roller 15 is greater than the width of the original film body 5 . The fourth-step roller 16 is tangent to the protective film body 3 .

[0055] Its advantages are:

[0056] First, the limiting material groove 20 provided on the first-step roller 12 and the lower supporting roller 17 is explained. Its purpose is to achieve the effect of positioning the original film body 5 with the simple structure of the limiting material groove 20. It should be noted that: the second-step roller 14 and the third-step roller 15 are both provided with a pressure roller 18. Its purpose is to apply pressure to the original film body 5 attached to the protective film body 3 so that the protective film body 3 and the original film body 5 are fully attached. On the other hand, the width of the pressure roller 18 on the second-step roller 14 and the third-step roller 15 is limited. On the premise that the third-step roller 15 synchronously transmits the protective film body 3 attached to the original film body 5, the "widened" pressure roller 18 is also used to fully press the original film body 5 to avoid problems such as gaps at the edges of the original film body 5.

[0057] The setting position of the lower roller shaft 17 is explained as follows: because the transmission direction of the entire protective film body 3 on the second-step roller shaft 14, the third-step roller shaft 15 and the fourth-step roller shaft 16 is in a horizontal state, and in order to ensure that the lower roller shaft 17 can apply pressure to the protective film body 3, it is necessary to ensure that the distance between the lower roller shaft 17 and the first-step roller shaft 12 and the second-step roller shaft 14 is equal, and the center point of the lower roller shaft 17 is higher than the center point of the first-step roller shaft 12 and the second-step roller shaft 14, so that the protective film body 3 located between the first-step roller shaft 12 and the second-step roller shaft 14 is in the shape of an equilateral triangle. The purpose is to facilitate the adjustment of the lower roller shaft 17 by the electric push rod 13;

[0058] The inner pressure arc block 11 on the stop roller shaft 4 is described, referring to Figure 6 , and combined with the running stroke of a punching cutting head 9, it can be understood that: the protective film body 3 is intermittently transported along the direction from left to right, and the protective film body 3 is interrupted after moving a distance. The interruption time is the punching action time of a punching cutting head 9, so the distance of each transmission process of the protective film body 3 is used as the relevant parameter on the internal pressure arc block 11, combined with Figure 6For example, the outer curved surface of the inner pressure arc block 11 close to the first-order roller shaft 12 is an arc surface, and contacts the inner groove surface of the limiting material groove 20 in the first-order roller shaft 12. Therefore, when the stop roller shaft 4 performs a continuous differential rotation action, when the inner pressure arc block 11 contacts the inner groove surface of the limiting material groove 20 in the first-order roller shaft 12, the inner pressure arc block 11 can fix the original film body 5 in the limiting material groove 20 in the first-order roller shaft 12, and clamp the original film body 5. At this time, the entire protective film body 3 is in the process of interrupting transmission, and the punching head 9 performs the punching action, the purpose of which is to achieve continuous and stable action with the continuous differential rotation action of the stop roller shaft 4;

[0059] Further integration Figure 3 Note: When the original film body 5 is wound around the first-step roller 12, there are two sections, which further limits the setting positions of the stopping roller 4 and the lower supporting roller 17. Specifically, the stopping roller 4 and the lower supporting roller 17 are set on both sides of the first-step roller 12, and the protective film body 5 at the above-mentioned two end parts are stabilized independently without interfering with each other.

[0060] Example 3

[0061] This embodiment is a supplementary solution to the first embodiment:

[0062] An external empty tube 25 is installed on the outer wall of the support block 19 near the second-order roller shaft 14. The installation direction of the external empty tube 25 is parallel to the width direction of the protective film body 3, and an atomizing nozzle 26 corresponding to the original film body 5 is installed on the external empty tube 25. The width of the atomizing nozzle 26 is equal to the width of the original film body 5, and the atomizing nozzle 26 is located in the middle position between the original film body 5 and the protective film body 3.

[0063] Its purpose is to: Figure 3 In the transmission process shown in FIG, the protective film body 3 is horizontally transmitted, and the original film body 5 is respectively wound onto the first transfer roller 6, the first-step roller 12 and the lower roller 17. If the traditional original film body 5 with viscosity is used, then Figure 3 The lower side of the original film body 5 shown in the figure is the sticky part. When the original film body 5 is wound onto the first-stage roller 12, the sticky part does not affect the transmission process. However, when it is wound onto the lower roller shaft 17, the sticky part on the original film body 5 contacts the lower roller shaft 17, which is bound to affect the transmission and bonding process of the original film body 5.

[0064] It should be explained that both sides of the original film body 5 in the present invention are not sticky, but in order to ensure that the original film body 5 is attached to the protective film body 3, it is necessary to Figure 5The external empty tube 25 shown in the figure serves as a glue-releasing structure to spray the viscous glue medium along the atomizing nozzle 26, and it is also necessary to further limit the structural shape between the atomizing nozzle 26 and the original film body 5. Specifically, the width of the atomizing nozzle 26 is equal to the width of the original film body 5. The purpose is to ensure that the glue medium can be accurately released to the position on the protective film body 3 corresponding to the original film body 5 to avoid overflow of the glue medium and affect the subsequent process.

[0065] Example 4

[0066] Combining the technical solutions in the above-mentioned embodiment 1 and embodiment 2, the following graphite sheet edge wrapping die-cutting process is generated, which includes a tension control stage, an interruption and stopping stage, and a linkage stage:

[0067] Tension control stage: the electric push rod 13, the lower roller shaft 17 and the pressure sensor 24 are used, and the critical tension value of the original film body 5 is preset. The process of the lower roller shaft 17 moving upward is set to the tension increasing state, and the process of the lower roller shaft 17 moving downward is set to the tension reducing state. The tension balance value is calculated based on the initial position parameters of the first-order roller shaft 12, the lower roller shaft 17 and the second-order roller shaft 14 and the traction force during the transmission of the protective film body 3;

[0068] Interrupted stopping stage: according to the dimensional parameters between each inner pressure arc block 11 converted from the movement stroke of the punching cutting head 9, the protective film body 3 performs intermittent transmission action from left to right according to the movement stroke of the punching cutting head 9, and the first-order roller 12, the second-order roller 14, the third-order roller 15, the fourth-order roller 16, the first transfer roller 6 and the second transfer roller 8 cooperate with the intermittent transmission action of the protective film body 3 to perform intermittent rotation action, and the stop roller 4 performs continuous differential rotation action;

[0069] Linkage stage: The linkage stage is used to coordinate the tension control stage and the transfer stop module, and specifically includes the following steps:

[0070] S1: When the protective film body 5 is in the process of interrupting the transmission, a punching and cutting head 9 performs a punching and cutting action on the protective film body 3, and pushes the lower roller shaft 17 upward through the electric push rod 13, entering the tension increasing state in the tension control stage, and the outer curved surface of one of the inner pressure arc blocks 11 is tangent to the inner groove surface of the limiting material groove 20 in the first-order roller shaft 12, and the stopping roller shaft 4 performs a clamping and stopping action on the original film body 5;

[0071] S2: After the first punching head 9 completes the punching action, and while the stop roller 4 continues to rotate, the inner pressure arc block 11 does not contact the inner groove surface of the limiting material groove 20 in the first-step roller 12, and the original film body 5 returns to the normal transmission process. The electric push rod 13 pushes the lower roller shaft 17 downward to enter the tension reduction state in the tension control stage;

[0072] S3: In S1 and S2, the value on the pressure sensor 24 is set to be greater than the tension balance value and less than the critical tension value, and the tension difference rate is preset in the linkage stage, the tension difference rate is 0.15, and the movement stroke of the electric push rod 13 in the tension increase state and the tension reduction state is controlled by the tension difference rate.

[0073] Principle explanation:

[0074] S1-1: What needs to be explained here is the tension control stage. Its principle is: the maximum tension that the original film body 5 can withstand is determined by the selected material of the original film body 5, which corresponds to the critical tension value. Because the critical tension value is determined by the material of the original film body 5 itself, the critical tension value is a constant value. The explanation of the tension balance value is: because the protective film body 3 located between the first-order roller shaft 12 and the second-order roller shaft 14 is "squeezed" into an equilateral triangle area by the lower roller shaft 17, the tension balance value can be preset according to production requirements. Specifically, within the range of the tension balance value, the normal transmission of the original film body 5 can be ensured, and the original film body 5 will not be subjected to large tension and deformation. Therefore, it is understood that the tension balance value is the value displayed on the pressure sensor 24 under ideal operating conditions;

[0075] S2-1: Here, the running stroke and working time of the punching and cutting head 9 are still based on the specific production process. In this embodiment, the running stroke and working time of the punching and cutting head 9 are taken as fixed values ​​and are not limited or repeated. Figure 6 , based on the center point of the stop roller 4, the arc length of the spacing between the internal pressure arc blocks 11 at each adjacent position is calculated by the arc length calculation formula. The arc length of the spacing is equal to the running stroke of the punching and cutting head 9. Combined with the continuous differential rotation action of the stop roller 4 in Example 1, because the entire device is in an intermittent transmission process, but the stop roller 4 keeps rotating continuously, the difference is: according to Figure 3 In the structural diagram, when the stop roller 4 rotates clockwise, when the internal pressure arc block 11 "clamps" the original film body 5, it represents the starting time of the punching and cutting head 9 performing the punching action. The internal pressure arc block 11 rotates to "relax" the original film body 5, which represents that the punching and cutting head 9 completes the punching action and the protective film body 3 returns to the normal transmission process. The time point from the internal pressure arc block 11 at each two adjacent positions "clamping" the original film body 5 to the time point of "relaxing" the original film body 5 is the working time of the punching and cutting head 9.

[0076] S3-1: Combined with the content in S1-1, set the critical tension value to , tension balance value is set to , then explain according to the overall linkage stage: in the normal transmission process of the protective film body 3, switch to the process of interrupting transmission, because in the normal transmission process, ensure that the value on the pressure sensor 24 during the process is equal to or slightly greater than Therefore, when switching to interrupted transmission, it is necessary to temporarily increase the tension on the original film body 5 between the first-order roller 12 and the second-order roller 14. The specific adjustment process is: the electric push rod 13 is used to push the mounting seat 21 upward. During this process, the value displayed on the pressure sensor 24 is set to In this process, a tension difference of 0.15 is added, which is specifically manifested as follows: The purpose is to ensure that when increasing the tension, it does not exceed , nor can it exceed the preset 0.15;

[0077] S3-2: When the transmission process is interrupted and restored to the normal transmission process, the lower roller shaft 17 cannot be directly driven to move downward. The purpose is to avoid the original film body 5 on the lower roller shaft 17 from elastically rebounding due to its own elastic force during the direct downward movement process, which makes it difficult for the original film body 5 to fully fit with the protective film body 3, resulting in wrinkles and other problems. To this end, the specific adjustment process is: the lower roller shaft 17 continues to move upward, and the tension on the original film body 5 between the first-order roller shaft 12 and the second-order roller shaft 14 is increased again, so as to prevent the original film body 5 from being elastically rebounded due to its own elastic force during the direct downward movement process. For example, the pressure sensor 24 is used to detect and display the values ​​in this section as follows: , and then substitute it into generate Finally, after the protective film body 3 is completely restored to the normal transmission process, the lower roller shaft 17 will slowly move downward, so that the value displayed on the pressure sensor 24 is restored to ;

[0078] In combination with the above content, the displayed value in the pressure sensor 24 is used to feedback the moving distance of the lower roller shaft 17 in the vertical direction, so as to further ensure the stability of the entire transmission process.

[0079] In summary: A corresponding transmission structure is proposed for the hemming action in the die-cutting process of the thermal conductive graphite film. In combination with the transmission process of the original film body during the hemming process, a stop roller and a lower support roller are respectively added. Specifically, the stop roller cooperates with the transmission action of the original film body to perform continuous differential rotation, and the original film body is clamped or relaxed without interfering with the transmission process of the original film body. The lower support roller is used to increase or decrease the tension value on the original film body, and further limit the position of the stop roller and the lower support roller relative to the first-order roller, as well as cooperate with the movement stroke of the punching cutting head in the overall die-cutting process to limit the stop roller and the lower support roller to perform appropriate movement. Its purpose is to cooperate with the "stabilization" of the transmission state of the original film body.

[0080] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0081] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0082] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A graphite sheet edge die-cutting device, comprising a work frame, a punching and cutting head, a protective film body, a graphite sheet, a drive motor unit and two original film bodies, characterized in that: The working frame is provided with a front roller, a first-order roller, a second-order roller, a third-order roller and a fourth-order roller in sequence along the transmission direction of the protective film body, and the transmission direction of the protective film body is from left to right; The working frame plate is respectively provided with a stop roller, a first transfer roller and a second transfer roller at the upper positions corresponding to the first-order roller, the second-order roller and the fourth-order roller, and a lower supporting roller is provided in the middle of the first-order roller and the second-order roller, and the lower supporting roller is located on the upper side of the protective film body; The original film body is sequentially wound around the lower side of the first transfer roller, the upper side of the first-step roller and the upper side of the lower supporting roller, the stopping roller is tangent to the first-step roller, the first-step roller and the lower supporting roller are provided with limiting material grooves corresponding to the original film body, a plurality of inner pressure arc blocks corresponding to the limiting material grooves are installed on the circumferential outer wall of the stopping roller, the plurality of inner pressure arc blocks are arranged in a ring array along the center point of the stopping roller, and the outer curved surface of the inner pressure arc block is tangent to the inner groove surface of the limiting material groove; A support block is installed at the position of the working frame plate corresponding to the lower roller shaft, and connecting blocks are rotatably installed at both ends of the lower roller shaft. A compensation chute corresponding to the connecting block is opened on the support block, and the compensation chute is vertically arranged. An electric push rod is installed at the position of the working frame plate corresponding to the support block, and a mounting seat is installed at the top of the transmission rod of the electric push rod. A pressure sensor is installed on the mounting seat, and the top of the transmission rod of the pressure sensor is connected to the connecting block; The lower roller shaft does not contact the protective film body, and the second-step roller shaft and the third-step roller shaft are provided with a pressure roller on the outer circumferential wall of the original film body corresponding to the original film body. The pressure roller is tangent to the protective film body, and the width of the pressure roller on the second-step roller shaft is equal to the width of the original film body, and the width of the pressure roller on the third-step roller shaft is greater than the width of the original film body. The fourth-step roller shaft is tangent to the protective film body. The outer curved surface of the inner pressure arc block close to the first-order roller is an arc surface, and contacts with the inner groove surface of the limiting material groove in the first-order roller. When the stop roller performs continuous differential rotation, when the inner pressure arc block contacts with the inner groove surface of the limiting material groove in the first-order roller, the inner pressure arc block fixes the original film body in the limiting material groove in the first-order roller, clamps the original film body, and protects the film body in the process of interrupting transmission. A punching and cutting head performs the punching action.

2. The graphite sheet edge wrapping die-cutting device according to claim 1, characterized in that: The number of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller is two, the protective film body is located in the middle position of the first-order roller, the second-order roller, the third-order roller and the fourth-order roller, and the graphite sheet is sequentially wound on the lower side of the second transfer roller and the middle position of the two fourth-order rollers.

3. The graphite sheet edge die-cutting device according to claim 1, characterized in that: The arc length between the internal pressure arc blocks at every two adjacent positions matches the movement stroke of the protective film body.

4. The graphite sheet edge wrapping die-cutting device according to claim 1, characterized in that: The two original film bodies are symmetrically arranged along the width direction of the protective film body, the graphite sheet is located in the middle position of the two original film bodies, and the lengths of the front roller, first-order roller, second-order roller, third-order roller and fourth-order roller are greater than the length of the protective film body.

5. The graphite sheet edge wrapping die-cutting device according to claim 2, characterized in that: The first-order roller, the second-order roller, the third-order roller, and the fourth-order roller located at the upper side rotate in a counterclockwise direction, and the first-order roller, the second-order roller, the third-order roller, and the fourth-order roller located at the lower side rotate in a clockwise direction; The rotation direction of the stop roller is clockwise.

6. The graphite sheet edge wrapping die-cutting device according to claim 1, characterized in that: The radial distances between the lower roller shaft and the first-order roller shaft and the second-order roller shaft are equal, and the center point height of the lower roller shaft is higher than the center point heights of the first-order roller shaft and the second-order roller shaft.

7. The graphite sheet edge wrapping die-cutting device according to claim 1, characterized in that: An external empty tube is installed on the outer wall of the support block close to the second-order roller. The installation direction of the external empty tube is parallel to the width direction of the protective film body, and an atomizing nozzle corresponding to the original film body is installed on the external empty tube.

8. The graphite sheet edge wrapping die-cutting device according to claim 7, characterized in that: The width of the atomizing nozzle is equal to the width of the original film body, and the atomizing nozzle is located in the middle of the original film body and the protective film body.

9. A graphite sheet edge wrapping die cutting process, characterized in that: A graphite sheet edge die-cutting device according to any one of claims 1 to 8 is used, and includes a tension control stage, an interruption stop stage and a linkage stage: Tension control stage: an electric push rod, lower idler shaft and pressure sensor are used, and the critical tension value of the original film body is preset. The upward movement of the lower idler shaft is set as the tension increasing state, and the downward movement of the lower idler shaft is set as the tension decreasing state. The tension balance value is calculated based on the initial position parameters of the first-order roller shaft, the lower idler shaft and the second-order roller shaft, as well as the traction force during the transmission of the protective film body; Interrupted stopping stage: The protective film body is intermittently transported from left to right according to the movement stroke of the punching and cutting head, which is converted into the size parameters between each internal pressure arc block. The first-order roller, second-order roller, third-order roller, fourth-order roller, first transfer roller and second transfer roller cooperate with the intermittent transmission action of the protective film body to perform intermittent rotation action, and the stop roller performs continuous differential rotation action; Linkage stage: The linkage stage is used to coordinate the tension control stage and the transfer stop module, and specifically includes the following steps: S1: When the protective film body is in the process of interrupting transmission, a punching and cutting head performs a punching and cutting action on the protective film body, and the lower roller shaft is pushed upward by the electric push rod, entering the tension increase state in the tension control stage. The outer curved surface of one of the inner pressure arc blocks is tangent to the inner groove surface of the limiting material groove in the first-order roller shaft, and the stop roller shaft performs a clamping and stopping action on the original film body; S2: After the punching head completes the punching action and the stop roller continues to rotate, the inner pressure arc block does not contact the inner groove surface of the limit groove in the step roller, and the original film body returns to the normal transmission process. The electric push rod pushes the lower roller shaft downward to enter the tension reduction state in the tension control stage; S3: In S1 and S2, the value on the pressure sensor is set to be greater than the tension balance value and less than the critical tension value, and the tension difference rate is preset in the linkage stage, the tension difference rate is 0.15, and the movement stroke of the electric push rod in the tension increase state and the tension reduction state is controlled by the tension difference rate.

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