An apparatus for preparing a smooth, non-migrating polyethylene composite film

Abstract

This invention relates to the field of composite film production technology and discloses a preparation device for a slippery, non-migrating polyethylene composite film. The device includes a laminating machine drying tunnel body. Adjustment boxes are fixedly connected to both sides of the bottom of the laminating machine drying tunnel body. Heat dissipation grooves are opened on both sides of the top of the laminating machine drying tunnel body. A heat dissipation sealing plate is installed inside the heat dissipation grooves. A connecting plate is fixedly connected to the bottom of the heat dissipation sealing plate. One end of the connecting plate passes through the laminating machine drying tunnel body and the adjustment boxes and extends into the interior of the adjustment boxes. A power mechanism is fixedly connected to one side of the inner wall of the adjustment boxes. Tensioning mechanisms are fixedly connected to both sides of the bottom of the heat dissipation sealing plate. This invention solves the problem that existing laminating machine drying tunnels experience excessively high temperatures during use, causing slippery agents to migrate and lose their effectiveness at high temperatures, resulting in poor subsequent processing properties of the composite film produced by the laminating machine and affecting the machine's performance.

Description

Technical Field

[0001] This invention relates to the field of composite film production technology, specifically to an apparatus for preparing a smooth, non-migrating polyethylene composite film. Background Technology

[0002] After polyolefin films are blown into films, the film layers tend to adhere under vacuum, making them difficult to separate. Furthermore, during long-term storage, the macromolecular chains of the polyolefin films interpenetrate and entangle, causing the films to bond firmly together and become difficult to separate, severely impacting their usability. To prevent this, a certain amount of slip agent is usually added during film production. This slip agent forms a film on the film surface, reducing the coefficient of friction and facilitating interlayer sliding, thus improving its opening properties. However, existing laminating machine drying tunnels operate at excessively high temperatures, causing the slip agent to migrate and lose its effectiveness. This results in the laminated film produced by the laminating machine having poor subsequent processing properties, affecting the film's performance on the machine. Summary of the Invention

[0003] This invention provides a preparation apparatus for a smooth, non-migrating polyethylene composite film, which has the beneficial effect of timely heat dissipation and prevention of high temperature. It solves the problem mentioned in the background art that the temperature of the drying tunnel of the existing composite machine is too high during use, and the slip agent will migrate and lose its function under high temperature, making it difficult to ensure good subsequent processing properties of the composite film produced by the composite machine, thus affecting the performance of the composite film on the machine.

[0004] The present invention provides the following technical solution: a preparation device for a smooth, non-migrating polyethylene composite film, comprising a laminating machine drying tunnel body, an adjustment box fixedly connected to both sides of the bottom of the laminating machine drying tunnel body, heat dissipation grooves opened on both sides of the top of the laminating machine drying tunnel body, a heat dissipation sealing plate arranged inside the heat dissipation groove, a connecting plate fixedly connected to the bottom of the heat dissipation sealing plate, one end of the connecting plate passing through the laminating machine drying tunnel body and the adjustment box and extending into the interior of the adjustment box, a power mechanism fixedly connected to one side of the inner wall of the adjustment box, and a tensioning mechanism fixedly connected to both sides of the bottom of the heat dissipation sealing plate.

[0005] As an optional embodiment of the preparation apparatus for the slippery, non-migrating polyethylene composite film of the present invention, the power mechanism includes two motors, which are arranged opposite to each other at the bottom of the inner wall of the adjustment box. The bottom of the motors is fixedly connected to the bottom of the inner wall of the adjustment box. A first connecting rod is fixedly connected to the output end of the motor. One end of the first connecting rod is rotatably connected to the inner wall of the adjustment box. An adjusting gear is fixedly connected to the outer side of the first connecting rod. The adjusting gear is located on one side of the connecting plate. Adjusting grooves for use with the adjusting gear are opened on both sides of the connecting plate. The adjusting gear is meshed with the connecting plate through the adjusting grooves.

[0006] As an optional embodiment of the preparation device for the smooth, non-migrating polyethylene composite film of the present invention, the tensioning mechanism includes a protective spring, one end of which is fixedly connected to a support plate. The support plate is located at the bottom of the heat dissipation sealing plate, and the length of the support plate is less than the length of the heat dissipation sealing plate. Both ends of the support plate are fixedly connected to extension plates, and there are two sets of extension plates. The two sets of extension plates are movably connected to a pressure roller through a rotating shaft. The pressure roller is located at the bottom of the support plate, and the bottom of the pressure roller is in contact with the composite film inside the drying tunnel of the composite machine.

[0007] As an optional embodiment of the apparatus for preparing the slippery, non-migrating polyethylene composite film of the present invention, wherein: a first transmission gear is fixedly connected to the outer side of the first connecting rod, the first transmission gear is located between the motor and the adjusting gear, a second connecting rod is provided on one side of the inner cavity of the adjusting box, the second connecting rod is located on one side of the first connecting rod and is arranged parallel to the first connecting rod, the front and back sides of the second connecting rod are rotatably connected to the inner wall of the adjusting box, and a second transmission gear is fixedly connected to the outer side of the second connecting rod, the second transmission gear is located on one side of the first transmission gear.

[0008] As an optional embodiment of the preparation apparatus for the slippery, non-migrating polyethylene composite film of the present invention, wherein: the first transmission gear and the second transmission gear are meshed and connected, a stabilizing gear is fixedly connected to the outside of the second connecting rod, and the stabilizing gear is located on one side of the adjusting gear and is connected to the connecting plate through the adjusting tooth groove.

[0009] As an optional embodiment of the preparation device for the smooth and non-migrating polyethylene composite film of the present invention, wherein: an extension sleeve is fixedly connected to the bottom of the adjustment box, and an opening groove is provided on both the bottom of the adjustment box and the top of the extension sleeve, the width of the opening groove being greater than the width of the connecting plate.

[0010] As an optional embodiment of the preparation apparatus for the slippery, non-migrating polyethylene composite film of the present invention, wherein: a fixing sleeve is slidably connected to the outer side of both the first connecting rod and the second connecting rod, and one side of the fixing sleeve is fixedly connected to the inner wall of the adjustment box.

[0011] As an optional embodiment of the preparation device for the smooth and non-migrating polyethylene composite film of the present invention, wherein: the bottom of the regulating box is fixedly connected to a fixed bracket, and both ends of the fixed bracket are fixedly connected to the bottom of the drying tunnel body of the composite machine.

[0012] As an optional embodiment of the apparatus for preparing the smooth, non-migrating polyethylene composite film of the present invention, a sliding plate is fixedly connected to one side of the extension plate, and one side of the sliding plate is slidably connected to the connecting plate.

[0013] As an optional embodiment of the preparation device for the smooth and non-migrating polyethylene composite film of the present invention, wherein: a limiting post is provided inside the protective spring, and the top of the limiting post is fixedly connected to the bottom of the heat dissipation sealing plate.

[0014] The present invention has the following beneficial effects:

[0015] 1. The preparation device for the smooth, non-migrating polyethylene composite film utilizes a combination of a laminating machine drying tunnel body, an adjusting box, a heat dissipation groove, a heat dissipation sealing plate, a connecting plate, a power mechanism, and a tensioning mechanism. After the motor starts, it drives the first connecting rod to rotate, which in turn drives the adjusting gear to rotate. The adjusting gear, through its adjusting groove, drives the connecting plate to move downwards, causing the connecting plate to move the heat dissipation sealing plate downwards, exposing the heat dissipation groove at the top of the heat dissipation sealing plate. At this time, the heat inside the laminating machine drying tunnel body is promptly discharged through the heat dissipation groove, achieving the effect of timely heat dissipation and preventing high temperatures. Simultaneously, as the heat dissipation sealing plate moves downwards, it also drives the tensioning mechanisms on both sides of the bottom to move downwards. The tensioning mechanisms press the film passing through the laminating machine drying tunnel body downwards through pressure rollers, thereby adjusting the film tension.

[0016] 2. The preparation device for the smooth and non-migrating polyethylene composite film, by setting a tensioning mechanism and connecting the protective spring to the support plate, can provide a buffering effect when the pressure roller connected to the bottom extension plate of the support plate is squeezed, preventing the pressure roller from being too tight when pressing the film and causing damage to the film, and providing a good protective effect for the film passing through the drying tunnel of the composite machine.

[0017] 3. The apparatus for preparing the smooth, non-migrating polyethylene composite film comprises a first transmission gear, a second connecting rod, a second transmission gear, and a stabilizing gear. When the first transmission gear rotates, it drives the second transmission gear to rotate. The second transmission gear drives the second connecting rod to rotate. The second connecting rod drives the stabilizing gear to rotate. The stabilizing gear, along with the adjusting gear, synchronously moves the connecting plate downward through the adjusting tooth groove. The stabilizing gear and the adjusting gear cooperate to clamp the connecting plate, making the movement of the connecting plate more stable and preventing uneven force on the connecting plate during movement, which could cause shaking or jamming. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the heat dissipation sealing plate in the descending state of the present invention.

[0020] Figure 3 This is a schematic cross-sectional view of the regulating box of the present invention.

[0021] Figure 4 This is a schematic diagram of the tensioning mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the disassembled structure of the tensioning mechanism of the present invention.

[0023] In the diagram: 1. Composite machine drying tunnel body; 2. Adjustment box; 3. Heat dissipation groove; 4. Heat dissipation sealing plate; 5. Connecting plate; 601. Motor; 602. First connecting rod; 603. Adjusting gear; 604. Adjusting tooth groove; 701. Protective spring; 702. Support plate; 703. Extension plate; 704. Pressure roller; 8. First transmission gear; 9. Second connecting rod; 10. Second transmission gear; 11. Stabilizing gear; 12. Extension sleeve; 13. Opening groove; 14. Fixed sleeve; 15. Fixed bracket; 16. Sliding plate; 17. Limiting post. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please see Figures 1 to 5The system includes a laminating machine drying tunnel body 1. Two regulating boxes 2 are fixedly connected to both sides of the bottom of the laminating machine drying tunnel body 1, symmetrically distributed at both ends of the bottom. The length of each regulating box 2 is the same as the length of the laminating machine drying tunnel body 1. Heat dissipation grooves 3 are provided on both sides of the top of the laminating machine drying tunnel body 1. The heat dissipation grooves 3 are stepped, and heat dissipation sealing plates 4 are installed inside the heat dissipation grooves 3. The heat dissipation sealing plates 4 are stepped and fit with the heat dissipation grooves 3 with a gap. The bottom of the heat dissipation sealing plates 4 are fixedly connected to... There are two connecting plates 5, which are symmetrically distributed at the bottom of the heat dissipation sealing plate 4. One end of the connecting plate 5 passes through the laminating machine drying tunnel body 1 and the regulating box 2 and extends into the interior of the regulating box 2. One side of the connecting plate 5 is slidably connected to the inner wall of the laminating machine drying tunnel body 1, and the other side of the connecting plate 5 contacts the film passing through the interior of the laminating machine drying tunnel body 1, thereby limiting the film. A power mechanism is fixedly connected to one side of the inner wall of the regulating box 2, and tensioning mechanisms are fixedly connected to both sides of the bottom of the heat dissipation sealing plate 4.

[0027] Please see Figure 3 The power mechanism includes two motors 601, which are arranged opposite to each other at the bottom of the inner wall of the regulating box 2. The bottom of the motors 601 is fixedly connected to the bottom of the inner wall of the regulating box 2. The output end of the motors 601 is fixedly connected to a first connecting rod 602. One end of the first connecting rod 602 is rotatably connected to the inner wall of the regulating box 2. When the first connecting rod 602 rotates, it can maintain stability during rotation by rotating with the regulating box 2. An adjusting gear 603 is fixedly connected to the outer side of the first connecting rod 602. The adjusting gear 603 is located on one side of the connecting plate 5. Both sides of the connecting plate 5 are provided with adjusting tooth grooves 604 for use with the adjusting gear 603. The adjusting gear 603 is meshed with the connecting plate 5 through the adjusting tooth grooves 604.

[0028] By setting up a power mechanism, after the motor 601 starts, it drives the first connecting rod 602 to rotate. The first connecting rod 602 drives the adjusting gear 603 to rotate. The adjusting gear 603 drives the connecting plate 5 to move downward through the adjusting tooth groove 604, so that the connecting plate 5 drives the heat dissipation sealing plate 4 to move downward, exposing the heat dissipation groove 3 at the top of the heat dissipation sealing plate 4. At this time, the heat inside the drying tunnel body 1 of the composite machine will be discharged in time through the heat dissipation groove 3, achieving the effect of timely heat dissipation and preventing high temperature.

[0029] Please see Figure 5The tensioning mechanism includes a protective spring 701. One end of the protective spring 701 is fixedly connected to a support plate 702. The support plate 702 is located at the bottom of the heat dissipation sealing plate 4, and the length of the support plate 702 is less than the length of the heat dissipation sealing plate 4. Both ends of the support plate 702 are fixedly connected to extension plates 703. There are two sets of extension plates 703. The two sets of extension plates 703 are movably connected to a pressure roller 704 through a rotating shaft. The pressure roller 704 is located at the bottom of the support plate 702, and the bottom of the pressure roller 704 is in contact with the composite film in the drying tunnel body 1 of the composite machine.

[0030] By setting a tensioning mechanism, the protective spring 701 is connected to the support plate 702, so that the pressure roller 704 connected to the bottom extension plate 703 of the support plate 702 can provide a buffering effect when it is squeezed, preventing the pressure roller 704 from being too tight when pressing the film, which would cause the film to be damaged. This provides good protection for the film passing through the drying tunnel body 1 of the laminating machine.

[0031] In this embodiment, when the temperature inside the laminating machine drying tunnel body 1 is too high, the motor 601 can be started. The motor 601 drives the first connecting rod 602 to rotate, and the first connecting rod 602 drives the adjusting gear 603 to rotate. The adjusting gear 603 drives the connecting plate 5 to move downward through the adjusting tooth groove 604, so that the connecting plate 5 drives the heat dissipation sealing plate 4 to move downward, exposing the heat dissipation groove 3 at the top of the heat dissipation sealing plate 4. At this time, the heat inside the laminating machine drying tunnel body 1 will be discharged in time through the heat dissipation groove 3. At the same time as the heat dissipation sealing plate 4 moves downward, it will drive the tensioning mechanism on both sides of the bottom to move downward. The tensioning mechanism presses the film passing inside the laminating machine drying tunnel body 1 downward through the pressure roller 704, which can achieve the effect of adjusting the film tension.

[0032] Example 2

[0033] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figures 1 to 5 A first transmission gear 8 is fixedly connected to the outer side of the first connecting rod 602. The first transmission gear 8 is located between the motor 601 and the adjusting gear 603. A second connecting rod 9 is provided on one side of the inner cavity of the adjusting box 2. The second connecting rod 9 is located on one side of the first connecting rod 602 and is arranged parallel to the first connecting rod 602. The front and back sides of the second connecting rod 9 are rotatably connected to the inner wall of the adjusting box 2. A second transmission gear 10 is fixedly connected to the outer side of the second connecting rod 9. The second transmission gear 10 is located on one side of the first transmission gear 8.

[0034] Please see Figure 3 The first transmission gear 8 and the second transmission gear 10 are meshed and connected. A stabilizing gear 11 is fixedly connected to the outside of the second connecting rod 9. The stabilizing gear 11 is located on one side of the adjusting gear 603 and is meshed with the connecting plate 5 through the adjusting tooth groove 604.

[0035] By setting up a first transmission gear 8, a second connecting rod 9, a second transmission gear 10, and a stabilizing gear 11, the rotation of the first transmission gear 8 will drive the rotation of the second transmission gear 10, which in turn drives the rotation of the second connecting rod 9. The second connecting rod 9 then drives the rotation of the stabilizing gear 11. The stabilizing gear 11, along with the adjusting gear 603, synchronously drives the connecting plate 5 to move downwards through the adjusting tooth groove 604. The stabilizing gear 11 and the adjusting gear 603 work together to clamp the connecting plate 5, making the movement of the connecting plate 5 more stable and preventing uneven force on the connecting plate 5 during movement, which could cause shaking or jamming.

[0036] Please see Figure 3 The bottom of the regulating box 2 is fixedly connected with an extension sleeve 12. There are two extension sleeves 12, which are symmetrically distributed at the bottom of the regulating box 2. Both the bottom of the regulating box 2 and the top of the extension sleeve 12 are provided with an opening slot 13. The width of the opening slot 13 is greater than the width of the connecting plate 5. The extension sleeve 12 increases the downward movement range of the connecting plate 5, increases the descent depth of the heat dissipation sealing plate 4, and increases the exposed distance of the heat dissipation port, thereby improving the heat dissipation effect.

[0037] Please see Figure 3 The first connecting rod 602 and the second connecting rod 9 are slidably connected to the outer side of the fixing sleeve 14. One side of the fixing sleeve 14 is fixedly connected to the inner wall of the regulating box 2. The fixing sleeve 14 can reinforce the connection between the first connecting rod 602 and the second connecting rod 9 and the inner wall of the regulating box 2, and prevent the first connecting rod 602 and the second connecting rod 9 from being damaged and broken after being subjected to force for a long time.

[0038] Please see Figure 1 The bottom of the regulating box 2 is fixedly connected to a fixed bracket 15. Both ends of the fixed bracket 15 are fixedly connected to the bottom of the laminating machine drying tunnel body 1. The fixed bracket 15 plays a supporting role at the bottom of the regulating box 2, making the connection between the regulating box 2 and the laminating machine drying tunnel body 1 more secure and less likely to fall off after long-term use.

[0039] Please see Figure 4 and Figure 5 A sliding plate 16 is fixedly connected to one side of the extension plate 703. One side of the sliding plate 16 is slidably connected to the connecting plate 5. The sliding plate 16 limits the extension plate 703, keeps the extension plate 703 moving up and down, and prevents the extension plate 703 from shaking or shifting when moving up and down. This further ensures that the heat dissipation sealing plate will not get stuck when it moves down to expose the heat dissipation groove.

[0040] Please see Figure 5The protective spring 701 is provided with a limiting post 17 inside. The top of the limiting post 17 is fixedly connected to the bottom of the heat dissipation sealing plate 4. The limiting post 17 can play a supporting role inside the protective spring 701 to prevent the protective spring 701 from deforming or bending after long-term use.

[0041] In this embodiment, the motor 601 drives the first connecting rod 602 to rotate. At the same time, the rotation of the first connecting rod 602 drives the first transmission gear 8 fixedly connected to the outside to rotate. When the first transmission gear 8 rotates, it drives the second transmission gear 10 to rotate. The second transmission gear 10 drives the second connecting rod 9 to rotate. The second connecting rod 9 drives the stabilizing gear 11 to rotate. The stabilizing gear 11, along with the adjusting gear 603, synchronously drives the connecting plate 5 to move downward through the adjusting tooth groove 604. The stabilizing gear 11 and the adjusting gear 603 cooperate left and right to clamp the connecting plate 5, which makes the movement of the connecting plate 5 more stable and prevents the connecting plate 5 from shaking or jamming due to uneven force when it moves.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An apparatus for preparing a smooth, non-migrating polyethylene composite film, comprising a composite machine drying tunnel body (1), characterized in that: The bottom of the composite machine drying tunnel body (1) is fixedly connected to both sides of the adjustment box (2), and the top of the composite machine drying tunnel body (1) is provided with both sides of the heat dissipation groove (3). The heat dissipation groove (3) is provided with a heat dissipation sealing plate (4). The bottom of the heat dissipation sealing plate (4) is fixedly connected to a connecting plate (5). One end of the connecting plate (5) passes through the composite machine drying tunnel body (1) and the adjustment box (2) and extends into the interior of the adjustment box (2). A power mechanism is fixedly connected to one side of the inner wall of the adjustment box (2). Tensioning mechanisms are fixedly connected to both sides of the bottom of the heat dissipation sealing plate (4). The connecting plate (5) is provided with adjusting tooth grooves (604) on both sides. The power mechanism includes an adjusting gear (603) that meshes with the adjusting tooth grooves (604). The tensioning mechanism includes a pressure roller (704) connected by a protective spring (701). The power mechanism includes two motors (601), which are arranged opposite to each other at the bottom of the inner wall of the regulating box (2). The bottom of the motor (601) is fixedly connected to the bottom of the inner wall of the regulating box (2). The output end of the motor (601) is fixedly connected to a first connecting rod (602). One end of the first connecting rod (602) is rotatably connected to the inner wall of the regulating box (2). An adjusting gear (603) is fixedly connected to the outside of the first connecting rod (602). The adjusting gear (603) is located on one side of the connecting plate (5). The adjusting gear (603) is meshed with the connecting plate (5) through an adjusting tooth groove (604). The tensioning mechanism includes a protective spring (701), one end of which is fixedly connected to a support plate (702). The support plate (702) is located at the bottom of the heat dissipation sealing plate (4), and the length of the support plate (702) is less than the length of the heat dissipation sealing plate (4). Both ends of the support plate (702) are fixedly connected to extension plates (703). There are two sets of extension plates (703). The two sets of extension plates (703) are movably connected to a pressure roller (704) through a rotating shaft. The pressure roller (704) is located at the bottom of the support plate (702), and the bottom of the pressure roller (704) is in contact with the composite film inside the drying tunnel body (1) of the composite machine.

2. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: A first transmission gear (8) is fixedly connected to the outer side of the first connecting rod (602). The first transmission gear (8) is located between the motor (601) and the adjusting gear (603). A second connecting rod (9) is provided on one side of the inner cavity of the adjusting box (2). The second connecting rod (9) is located on one side of the first connecting rod (602) and is parallel to the first connecting rod (602). The front and back sides of the second connecting rod (9) are rotatably connected to the inner wall of the adjusting box (2). A second transmission gear (10) is fixedly connected to the outer side of the second connecting rod (9). The second transmission gear (10) is located on one side of the first transmission gear (8).

3. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 2, characterized in that: The first transmission gear (8) and the second transmission gear (10) are meshed together. A stabilizing gear (11) is fixedly connected to the outside of the second connecting rod (9). The stabilizing gear (11) is located on one side of the adjusting gear (603) and is connected to the connecting plate (5) through the adjusting tooth groove (604).

4. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: An extension sleeve (12) is fixedly connected to the bottom of the regulating box (2). An opening slot (13) is provided at the bottom of the regulating box (2) and the top of the extension sleeve (12). The width of the opening slot (13) is greater than the width of the connecting plate (5).

5. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: The first connecting rod (602) and the second connecting rod (9) are slidably connected to a fixing sleeve (14), and one side of the fixing sleeve (14) is fixedly connected to the inner wall of the adjusting box (2).

6. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: The bottom of the regulating box (2) is fixedly connected to a fixed bracket (15), and both ends of the fixed bracket (15) are fixedly connected to the bottom of the drying tunnel body (1) of the composite machine.

7. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: A sliding plate (16) is fixedly connected to one side of the extension plate (703), and one side of the sliding plate (16) is slidably connected to the connecting plate (5).

8. The apparatus for preparing a smooth, non-migrating polyethylene composite film according to claim 1, characterized in that: The protective spring (701) is provided with a limiting post (17) inside, and the top of the limiting post (17) is fixedly connected to the bottom of the heat dissipation sealing plate (4).

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