A sealing performance testing device for hot melt adhesive film

Abstract

The application discloses a sealing performance testing device for hot melt adhesive film and relates to the technical field of hot melt adhesive film testing. The device comprises a box body, characterized in that the bottom of the box body is fixedly connected with a base, a detection cavity is formed in the middle of the top of the base, a PLC controller is installed on the top of the box body, an electric cylinder one is installed in the middle of the inner bottom wall of the box body, the output end of the electric cylinder one is fixedly connected with a connecting cover, a connecting column is fixedly arranged in the middle of the bottom of the connecting cover, a fixing table is fixedly arranged on the bottom of the connecting cover through the connecting column, and an air inlet cover is arranged on the bottom of the fixing table. The device is provided with a rotating expansion assembly, a fixing table and a sliding groove, different shapes of hot melt adhesive films can be randomly laid on the top of the laying plate, and the hot melt adhesive films are rapidly rotated and unfolded at multiple stress points. The device can not only rapidly unfold the hot melt adhesive films, avoid the influence of wrinkles of the hot melt adhesive films on the detection effect, but also prevent the damage of the hot melt adhesive films caused by uneven tension during the unfolding process.

Description

Technical Field

[0001] This invention relates to the field of hot melt adhesive film testing technology, specifically to a device for testing the sealing performance of hot melt adhesive films. Background Technology

[0002] Hot melt adhesive film is a type of film product with or without release paper. It can be easily processed continuously or intermittently and is widely used for bonding various fabrics, papers, polymer materials, and metals. During the formation of hot melt adhesive film, the liquid hot melt adhesive needs to be heated to the operating temperature and then cured into a film at room temperature. Because the state of the hot melt adhesive changes, leakage may occur, which can damage the formed hot melt adhesive film and result in poor airtightness. Therefore, an airtightness testing device is needed to test its airtightness.

[0003] While existing testing devices can perform certain sealing performance tests on hot melt adhesive films, they mainly rely on mechanical structures such as frames, inserts, and clips to fix the hot melt adhesive film. This fixing method makes it difficult to ensure that the hot melt adhesive film remains flat during the fixing process, and it is prone to wrinkles, local loosening, and damage. During pressure testing, if the hot melt adhesive film is not firmly fixed or the tension is uneven, the test results may be inaccurate, or even the testing process may be affected by the loosening of the film material.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing performance testing device for hot melt adhesive films, in order to solve the problems in the prior art where it is difficult to ensure that the hot melt adhesive film remains flat during the fixing process, and wrinkles, local loosening and damage are prone to occur. During the pressure testing process, if the hot melt adhesive film is not firmly fixed or the tension is uneven, the test results may be inaccurate, or even the test process may be affected by the loosening of the film material. The technical solution of this invention provides a solution that is significantly different from the existing technology, which is too simplistic.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sealing performance testing device for hot melt adhesive film, comprising a housing, characterized in that: a base is fixedly connected to the bottom of the housing, a detection chamber is opened in the middle of the top of the base, a PLC controller is installed on the top of the housing, an electric cylinder is installed in the middle of the inner bottom wall of the housing, a connecting cover is fixedly connected to the output end of the electric cylinder, a connecting column is fixed in the middle of the bottom of the connecting cover, a fixed platform is fixed to the bottom of the connecting cover through the connecting column, and an air inlet hood is provided at the bottom of the fixed platform;

[0007] The top of the fixed platform is provided with a rotating expansion assembly, which includes a rotating platform rotatably connected to the connecting column. Telescopic push rods are evenly arranged on the side of the rotating platform. The outer bottom end of the telescopic push rod is connected to a push plate through a limiting telescopic rod. The bottom of the push plate is evenly equipped with directional wheels. The interior of the fixed platform is provided with a wear compensation assembly.

[0008] Preferably, the top of the fixed platform is provided with a sliding groove, and the bottom of the telescopic push rod is equipped with a slider. The slider slides within the sliding groove and the sliding groove is set as an arc-shaped inclined structure.

[0009] Preferably, two electric cylinders are embedded in both sides of the bottom wall of the fixed platform, and the output ends of the two electric cylinders are fixedly connected to the top sides of the air intake shroud, respectively.

[0010] Preferably, a large gear is fixedly sleeved on the outside of the connecting column, and a small gear driven by a motor is meshed on the outside of the large gear. The small gear is rotatably connected to the inner top wall of the fixed platform through a rotating shaft.

[0011] Preferably, a flat plate is installed on the top of the base, and a hole adapted to the detection chamber is opened in the middle of the flat plate. The detection chamber is adapted to the hole at the bottom of the air intake shroud and is consistent in the vertical direction.

[0012] Preferably, the wear compensation component includes a rotating ring rotatably connected to a fixed platform, with a first spiral rod mounted on both sides of the rotating ring via a motor, a second spiral rod vertically slidingly mounted at the bottom of the first spiral rod, a sealing plate mounted at the bottom of the second spiral rod, and a rubber pad fixed at the bottom of the sealing plate.

[0013] Preferably, the sealing plate is embedded in the bottom of the air intake shroud, and connecting blocks are installed on both sides of the top of the sealing plate. The connecting blocks are sleeved on the second spiral rod. The inner wall of the connecting block and the inner wall of the rotating ring are provided with protrusions. The protrusions of the rotating ring and the connecting block are respectively in contact with and slide against the spiral tracks of the first spiral rod and the second spiral rod.

[0014] Preferably, telescopic connecting rods are evenly arranged on the outer side of the rotating ring, and the outer ends of the telescopic connecting rods are laterally telescopically installed on the inner wall of the push plate.

[0015] Preferably, the bottom of the telescopic push rod is fixed to the telescopic end of the limiting telescopic rod, and the bottom of the limiting telescopic rod is embedded in the top cavity of the push plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention, by setting up a rotating expansion component, a fixed platform, and a sliding groove, allows hot melt adhesive films of different shapes to be randomly laid on the top of a laying plate. The fixed platform is moved down, and the hot melt adhesive film is contacted by directional wheels. The motor drives the telescopic push rod to rotate and extend synchronously, thereby rapidly rotating and unfolding the hot melt adhesive film at multiple force points. This not only allows the hot melt adhesive film to be unfolded quickly, avoiding the impact of wrinkles on the detection effect, but also prevents damage to the hot melt adhesive film caused by uneven tension during the unfolding process.

[0018] 2. This invention, by setting up a detection chamber, two electric cylinders, an air inlet cover, and a sealing plate, allows the air inlet cover to be stably moved downwards and pressed against the hot melt adhesive film after the hot melt adhesive film has been unfolded, driven by the extension and retraction of the output ends of the two electric cylinders. The air inlet cover is then pressed down and adhered to the hot melt adhesive film. The sealing plate forms a sealed reaction chamber and a detection chamber. A micro air pump is started to pressurize and supply air into the reaction chamber through the internal space of the air inlet cover and the bottom hole. A high-precision pressure sensor senses the change in air pressure in the detection chamber. At the same time, the rotating expansion component keeps the outer ring of the hot melt adhesive film under constant pressure. This allows for quick and convenient detection of whether the hot melt adhesive film is damaged, and also prevents the hot melt adhesive film from loosening during the detection process, which would lead to inaccurate detection results.

[0019] 3. In this invention, by setting up a wear compensation component, when wear occurs on the rubber pad at the bottom of the sealing plate and the directional wheel, two motors can be started simultaneously by manual operation via a PLC controller. This drives the rotating ring and the sealing plate to descend vertically until the bottom surface of the sealing plate is flush with the bottom surface of the air intake hood. At the same time, the directional wheel moves down synchronously to maintain a relative position with the sealing plate, thereby synchronously and quickly compensating for the wear of the sealing plate and the directional wheel. On the one hand, this allows the directional wheel to unfold the workpiece at a predetermined position, and on the other hand, it allows the air intake hood to move down a constant distance to achieve internal sealing and air intake. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation structure of the electric cylinder of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 This is a schematic diagram of the structure of the fixing platform of the present invention;

[0024] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0025] Figure 6 This is a schematic diagram of the mounting structure of the directional wheel of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the rotational expansion assembly of the present invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C;

[0029] Figure 10 This is a schematic diagram of the installation structure of the electric cylinder 2 of the present invention;

[0030] Figure 11 This is a schematic diagram of the structure of the second screw rod of the present invention.

[0031] In the diagram: 1. Box body; 2. Base; 201. Flat plate; 202. Detection chamber; 3. PLC controller; 4. Electric cylinder one; 5. Connecting cover; 501. Connecting column; 6. Fixed platform; 601. Slide groove; 7. Rotating platform; 701. Telescopic push rod; 702. Push plate; 703. Limiting telescopic rod; 704. Large gear; 705. Small gear; 706. Directional wheel; 707. Slider; 8. Air inlet hood; 801. Sealing plate; 802. Connecting block; 803. Electric cylinder two; 9. Rotating ring; 901. Helical rod one; 902. Helical rod two; 903. Telescopic connecting rod. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1-11This invention provides a technical solution: a sealing performance testing device for hot melt adhesive film, comprising a housing 1, a base 2 fixedly connected to the bottom of the housing 1, a detection chamber 202 formed in the middle of the top of the base 2, a high-precision pressure sensor installed inside the detection chamber 202, capable of real-time monitoring of minute pressure changes within the detection chamber 202, with a measurement range of 0-100 kPa and an accuracy of ±0.5%FS, and a PLC controller 3 installed on the top of the housing 1, the PLC controller 3 having a built-in human-machine interface that can display test data in real time. An electric cylinder 4 is installed in the middle of the inner bottom wall. The output end of the electric cylinder 4 is fixedly connected to a connecting cover 5. A connecting column 501 is fixed in the middle of the bottom of the connecting cover 5. A fixed platform 6 is fixed to the bottom of the connecting cover 5 through the connecting column 501. An air inlet hood 8 is set at the bottom of the fixed platform 6. Gas can be pressurized and input into the air inlet hood 8 through a micro air pump. The electric cylinder 4 is started manually through the button of the PLC controller 3. The electric cylinder 4 is a guide electric cylinder. The extension and retraction of the output end of the electric cylinder 4 can drive the connecting cover 5, the fixed platform 6 and the air inlet hood 8 to move up and down stably.

[0034] The top of the fixed platform 6 is equipped with a rotating expansion assembly, which includes a rotating platform 7 rotatably connected to the connecting column 501. Telescopic push rods 701 are evenly arranged on the sides of the rotating platform 7. Multiple telescopic push rods 701 can evenly expand the hot melt adhesive film in multiple directions during rotation, and evenly distribute the force points to prevent pulling and damage to the hot melt adhesive film during expansion. A push plate 702 is connected to the outer bottom of the telescopic push rods 701 via a limiting telescopic rod 703. Directional wheels 706 are evenly installed on the bottom of the push plate 702. The inner... The unit is equipped with a wear compensation component. Multiple directional wheels 706 can disperse the force exerted on the hot melt adhesive film by each telescopic push rod 701, making the force distribution on the hot melt adhesive film more fine and even. The rotation direction of each directional wheel 706 is consistent with the movement trajectory of its respective push point, which facilitates the rotation of the expansion component and prevents the hot melt adhesive film from wrinkling due to the rotation of the directional wheels 706 during the rotation and unfolding process. In addition, the wheels of the directional wheels 706 are made of rubber, which can increase the friction with the hot melt adhesive film and unfold the hot melt adhesive film more smoothly and gently on the top of the laying plate 201.

[0035] In one embodiment of the present invention, a groove 601 is provided on the top of the fixed platform 6, and a slider 707 is installed on the bottom of the telescopic push rod 701. The slider 707 slides within the groove 601. The groove 601 is set as an arc-shaped inclined structure. The slider 707 moves along the groove 601 in a direction away from the center and moves the telescopic end of the telescopic push rod 701 outward, thereby driving the push plate 702 to move steadily in a direction away from the center and quickly unfolding the hot melt adhesive film through the directional wheel 706. The curvature of multiple grooves 601 is consistent, which can ensure that the extension length of each telescopic push rod 701 is consistent, so that the force is always uniform during the unfolding process of the hot melt adhesive film, increasing the unfolding efficiency of the hot melt adhesive film and preventing the hot melt adhesive film from being damaged due to uneven force.

[0036] In one embodiment of the present invention, electric cylinders 803 are embedded in both sides of the bottom wall of the fixed platform 6. The output ends of the two electric cylinders 803 are fixedly connected to the top sides of the air intake hood 8, respectively. Both electric cylinders 803 are electrically connected to the PLC controller 3. The manual can drive the output ends of the two electric cylinders 803 to extend and retract through the PLC controller 3, thereby driving the air intake hood 8 to move stably up and down.

[0037] In one embodiment of the present invention, a large gear 704 is fixedly sleeved on the outside of the connecting column 501. The large gear 704 is meshed with a small gear 705 driven by a motor. The small gear 705 is rotatably connected to the inner top wall of the fixed platform 6 through a rotating shaft. The motor is electrically connected to the PLC controller 3. The motor can be started manually through the PLC controller 3. The output end of the motor drives the small gear 705 to rotate, thereby driving the large gear 704 and the rotating platform 7 to rotate.

[0038] In one embodiment of the present invention, a laying plate 201 is installed on the top of the base 2. The laying plate 201 has a hole in the middle that matches the detection chamber 202. The detection chamber 202 matches the hole at the bottom of the air inlet hood 8 and is consistent in the vertical direction. The surface of the laying plate 201 is smooth, which can reduce the wear of the hot melt adhesive film during the unfolding process on the top of the laying plate 201. The laying plate 201 is fixedly connected to the top of the base 2 by screws at the four corners, which facilitates replacement after the surface of the laying plate 201 is worn. After the hot melt adhesive film is unfolded on the surface of the laying plate 201, the air inlet hood 8 is pressed down to the top of the hot melt adhesive film and adheres to it, so that the hole at the bottom of the air inlet hood 8 is aligned with the detection chamber 202. A reaction chamber is quickly formed between the air inlet hood 8 and the hot melt adhesive film. By introducing gas into the reaction chamber and detecting whether there is a change in gas pressure in the detection chamber 202, hot melt adhesive films of various shapes can be quickly and gently unfolded and their airtightness tested.

[0039] The specific implementation method is as follows: In use, hot melt adhesive films of various shapes can be laid on the top of the laying plate 201. The electric cylinder 4 is manually started by the PLC controller 3, which drives the fixed platform 6 to move down. When the directional wheel 706 contacts the hot melt adhesive film and adheres to it, the motor rotates automatically, driving the rotating platform 7 and the telescopic push rod 701 to rotate along the slide groove 601. Under the action of the slider 707, each telescopic push rod 701 gradually extends away from the center, respectively driving the push plate 702 and the directional wheel 706 at its bottom to rotate and move outward until the hot melt adhesive film is fully unfolded. Then, the two electric cylinders 803 are simultaneously started by the PLC controller 3, which drives the air inlet hood 8 to descend until the hot melt adhesive film is pressed together. The high-precision detection chamber 202 is then tested. The pressure sensor detects the pressure value and feeds the data back to the human-machine interface. A reaction chamber is formed between the air inlet hood 8 and the hot melt adhesive film. The required pressure value and test time are set in the PLC controller 3 according to different hot melt adhesive films. The micro air pump is started to supply air and pressurize the reaction chamber. At the same time, the rotating expansion component keeps the outer ring of the hot melt adhesive film in a state of compression to ensure that the hot melt adhesive film does not loosen. After the preset value is reached, the micro air pump automatically stops operating. Meanwhile, the pressure value in the detection chamber 202 is observed through the human-machine interface to see if there is a change. If the pressure value in the detection chamber 202 rises, it means that the hot melt adhesive film is damaged. Conversely, if the pressure value in the detection chamber 202 remains unchanged, it means that the hot melt adhesive film is intact and the quality is qualified.

[0040] In one embodiment of the present invention, the wear compensation component includes a rotating ring 9 rotatably connected to a fixed platform 6. Two helical rods 901 are mounted on both sides of the rotating ring 9 via motors. A second helical rod 902 is vertically slidably mounted at the bottom of the first helical rod 901. The threads of the first helical rod 901 and the second helical rod 902 on both sides are opposite in direction. The two motors are electrically connected to a PLC controller 3. A sealing plate 801 is mounted at the bottom of the second helical rod 902. A rubber pad is fixed at the bottom of the sealing plate 801. The sealing plate 801 increases the friction between the air intake hood 8 and the hot melt adhesive film, making the air intake hood 8 and the hot melt adhesive film adhere more tightly, and also making the hot melt adhesive film adhere more tightly to the laying plate 201, forming a more sealed reaction chamber and test chamber, making the test results more accurate. Limiting blocks are provided on both sides of the second helical rod 902. The top of the second helical rod 902 can slide up and down at the bottom of the first helical rod 901, but cannot rotate left and right at the bottom of the first helical rod 901.

[0041] In one embodiment of the present invention, the sealing plate 801 is embedded in the bottom of the air intake shroud 8, and connecting blocks 802 are installed on both sides of the top of the sealing plate 801. The connecting blocks 802 are sleeved on the second spiral rod 902. The inner wall of the connecting block 802 and the inner wall of the rotating ring 9 are both provided with protrusions. The protrusions of the rotating ring 9 and the connecting block 802 are respectively in contact with and slide against the spiral tracks of the first spiral rod 901 and the second spiral rod 902.

[0042] In one embodiment of the present invention, telescopic connecting rods 903 are evenly arranged on the outer side of the rotating ring 9. The outer ends of the telescopic connecting rods 903 are laterally telescopically installed on the inner wall of the push plate 702. The two telescopic connecting rods 903 support the push plate 702 and can drive the push plate 702 and the directional wheel 706 to move down synchronously with the rotating ring 9 through the telescopic connecting rods 903.

[0043] In one embodiment of the present invention, the bottom of the telescopic push rod 701 is fixed to the telescopic end of the limiting telescopic rod 703. The bottom of the limiting telescopic rod 703 is embedded in the top cavity of the push plate 702. The telescopic end of the telescopic connecting rod 903 can extend as the push plate 702 moves outward. The limiting telescopic rod 703 extends and is fixed as the push plate 702 moves downward, and also provides upward support for the telescopic push rod 701. During prolonged operation, the rubber pad will experience synchronous wear, which can easily lead to the air intake shroud 8 failing to tightly adhere to the hot melt adhesive film. The sealing of the reaction chamber and the test chamber weakens. The two motors are started synchronously by the PLC controller 3. The output ends of the two motors rotate in opposite directions, driving the first screw rod 901 and the second screw rod 902 on both sides to rotate synchronously in opposite directions. This causes the rotating ring 9 and the sealing plate 801 to descend synchronously in the vertical direction until the bottom surface of the rubber pad at the bottom of the sealing plate 801 is flush with the bottom surface of the air inlet hood 8. The directional wheel 706 moves down synchronously and maintains a relative position with the bottom rubber pad of the sealing plate 801, thereby compensating for the wear of the bottom rubber pad of the sealing plate 801.

[0044] Working principle: Hot melt adhesive films of various shapes can be laid on the top of the laying plate 201. The electric cylinder 4 is started by the PLC controller 3, which drives the fixed platform 6 to move down. When the directional wheel 706 first contacts the hot melt adhesive film, the motor rotates, driving the rotating platform 7 and the telescopic push rod 701 to rotate along the slide groove 601. Under the action of the slider 707, each telescopic push rod 701 gradually extends away from the center, respectively driving the push plate 702 and the directional wheel 706 at its bottom to rotate and move outward. The directional wheel 706 can rotate laterally until the hot melt adhesive film is completely unfolded. Then, the two electric cylinders 803 are started simultaneously by the PLC controller 3, which drives the air intake hood. The pressure is lowered until the hot melt adhesive film is pressed together. The high-precision pressure sensor in the detection chamber 202 detects the pressure value at this time and feeds the data back to the display screen. A reaction chamber is formed between the air inlet hood 8 and the hot melt adhesive film. According to the test pressure value and test time set in the PLC controller 3, the micro air pump is started to supply air and pressurize the reaction chamber. After the preset value is reached, the micro air pump automatically stops operating. At the same time, the pressure value in the detection chamber 202 is observed through the human-machine interface to see if there is a change. If the pressure value in the detection chamber 202 rises, it means that the hot melt adhesive film is damaged. Conversely, if the pressure value in the detection chamber 202 remains unchanged, it means that the hot melt adhesive film is intact and the quality is qualified.

[0045] Two motors are periodically started synchronously via PLC controller 3. The outputs of the two motors rotate in opposite directions, driving the first screw rod 901 and the second screw rod 902 on both sides to rotate synchronously in opposite directions. This, in turn, causes the rotating ring 9 and the sealing plate 801 to descend synchronously in the vertical direction until the bottom surface of the rubber pad at the bottom of the sealing plate 801 is flush with the bottom surface of the air intake hood 8. This replenishes the wear of the rubber pad at the bottom of the sealing plate 801, allowing the air intake hood 8 to descend a constant distance, thus achieving sealing and subsequent testing. At the same time, the directional wheel 706 moves down synchronously to maintain a relative position with the sealing plate 801, facilitating the replenishment of wear on the directional wheel 706 and improving the long-term testing effect on the workpiece.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing performance testing device for hot melt adhesive film, comprising a housing (1), characterized in that: The bottom of the housing (1) is fixedly connected to a base (2), and a detection chamber (202) is opened in the middle of the top of the base (2). A PLC controller (3) is installed on the top of the housing (1). An electric cylinder (4) is installed in the middle of the inner bottom wall of the housing (1). A connecting cover (5) is fixedly connected to the output end of the electric cylinder (4). A connecting column (501) is fixed in the middle of the bottom of the connecting cover (5). A fixed platform (6) is fixed to the bottom of the connecting cover (5) through the connecting column (501). An air inlet hood (8) is provided at the bottom of the fixed platform (6). The top of the fixed platform (6) is provided with a rotating expansion assembly, which includes a rotating platform (7) rotatably connected to the connecting column (501). Telescopic push rods (701) are evenly arranged on the side of the rotating platform (7). The bottom of the telescopic push rod (701) is connected to a push plate (702) through a limiting telescopic rod (703). A directional wheel (706) is evenly installed on the bottom of the push plate (702). The interior of the fixed platform (6) is provided with a wear compensation assembly.

2. The sealing performance testing device for hot melt adhesive film according to claim 1, characterized in that: The top of the fixed platform (6) is provided with a sliding groove (601), and the bottom of the telescopic push rod (701) is provided with a slider (707). The slider (707) slides within the sliding groove (601) and the sliding groove (601) is set as an arc-shaped inclined structure.

3. The sealing performance testing device for hot melt adhesive film according to claim 2, characterized in that: Electric cylinders 2 (803) are embedded in both sides of the bottom wall of the fixed platform (6), and the output ends of the two electric cylinders 2 (803) are fixedly connected to the top sides of the air intake hood (8).

4. The sealing performance testing device for hot melt adhesive film according to claim 3, characterized in that: A large gear (704) is fixedly sleeved on the outside of the connecting column (501). The large gear (704) is meshed with a small gear (705) driven by a motor. The small gear (705) is rotatably connected to the inner top wall of the fixed platform (6) through a rotating shaft.

5. The sealing performance testing device for hot melt adhesive film according to claim 4, characterized in that: The base (2) is equipped with a paving plate (201) on top. The paving plate (201) has a hole in the middle that is compatible with the detection chamber (202). The detection chamber (202) is compatible with the hole at the bottom of the air intake hood (8) and is consistent in the vertical direction.

6. The sealing performance testing device for hot melt adhesive film according to claim 5, characterized in that: The wear compensation assembly includes a rotating ring (9) rotatably connected to a fixed platform (6). A first spiral rod (901) is mounted on both sides of the rotating ring (9) via a motor. A second spiral rod (902) is vertically slidably mounted on the bottom of the first spiral rod (901). A sealing plate (801) is mounted on the bottom of the second spiral rod (902). A rubber pad is fixed on the bottom of the sealing plate (801).

7. The sealing performance testing device for hot melt adhesive film according to claim 6, characterized in that: The sealing plate (801) is embedded in the bottom of the air intake hood (8). Connecting blocks (802) are installed on both sides of the top of the sealing plate (801). The connecting blocks (802) are sleeved on the second spiral rod (902). The inner wall of the connecting block (802) and the inner wall of the rotating ring (9) are provided with protrusions. The protrusions of the rotating ring (9) and the connecting block (802) are respectively in contact with and slide against the spiral tracks of the first spiral rod (901) and the second spiral rod (902).

8. The sealing performance testing device for hot melt adhesive film according to claim 7, characterized in that: Telescopic connecting rods (903) are evenly arranged on the outer side of the rotating ring (9), and the outer end of the telescopic connecting rods (903) is installed laterally on the inner wall of the push plate (702).

9. The sealing performance testing device for hot melt adhesive film according to claim 8, characterized in that: The bottom of the telescopic push rod (701) is fixed to the telescopic end of the limiting telescopic rod (703), and the bottom of the limiting telescopic rod (703) is embedded in the top cavity of the push plate (702).

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