Sealing performance testing device for hot melt adhesive film

Abstract

The invention discloses a sealing performance testing device for a hot melt adhesive film, and relates to the technical field of hot melt adhesive film testing. Which comprises a box body and is characterized in that the bottom of the box body is fixedly connected with a base, the middle of the top of the base is provided with a detection cavity, the top of the box body is provided with a PLC, the middle of the inner bottom wall of the box body is provided with a first electric cylinder, the output end of the first electric cylinder is fixedly connected with a connecting cover, and the middle of the bottom of the connecting cover is fixedly provided with a connecting column; a fixing table is fixed to the bottom of the connecting cover through connecting columns, and an air inlet cover is arranged at the bottom of the fixing table. By arranging the rotating expansion assembly, the fixing table and the sliding groove, hot melt adhesive films of different shapes are laid at the top of the flattening plate at will, the hot melt adhesive films are rapidly rotated and unfolded through multiple stress points, the hot melt adhesive films can be rapidly unfolded, the situation that the detection effect is affected due to the fact that the hot melt adhesive films are wrinkled is avoided, and the detection efficiency is improved. And moreover, the hot melt adhesive film can be prevented from being damaged due to non-uniform tension in the process of unfolding the hot melt adhesive film.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesive film testing, in particular to a sealing performance testing device for hot melt adhesive film. Background Art

[0002] Hot melt adhesive film is a film product with or without release paper. It can be easily operated continuously or intermittently and can be widely used for bonding various types of fabrics, paper, polymer materials and metals. During the formation process of the hot melt adhesive film, the liquid hot melt adhesive needs to be heated to the use temperature and then solidified into a film at room temperature. Due to the change in the state of the hot melt adhesive, leakage may occur, causing the formed hot melt adhesive film to be damaged, resulting in poor air tightness. Therefore, an air tightness detection device is required to detect its air tightness.

[0003] Although the existing detection device can perform a certain sealing performance test on the hot melt adhesive film, the existing device mainly relies on mechanical structures such as frames, plugs, and clamps to fix the hot melt adhesive film. This fixing method cannot ensure that the hot melt adhesive film remains flat during the fixing process, and it is prone to wrinkles, local relaxation and damage. During the pressure testing process, due to the loose fixation or uneven tension of the hot melt adhesive film, the test results may be inaccurate, and even the test process may be affected by the loose film material.

[0004] In response to the above problems, it is urgent to carry out innovative design based on the original foundation. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing performance testing device for hot-melt adhesive film, so as to solve the problem in the above-mentioned background technology that it is difficult to ensure that the hot-melt adhesive film remains flat during the fixing process, and is prone to wrinkles, local relaxation and damage. During the pressure detection process, due to the loose fixation or uneven tension of the hot-melt adhesive film, the test results may be inaccurate, and even the test process may be affected by the loose film material. The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a sealing performance testing device for hot melt adhesive film, comprising a box, characterized in that: a base is fixedly connected to the bottom of the box, a detection cavity is opened in the middle of the top of the base, a PLC controller is installed on the top of the box, an electric cylinder 1 is installed in the middle of the inner bottom wall of the box, an output end of the electric cylinder 1 is fixedly connected to a connecting cover, a connecting column is fixed to the middle of the bottom of the connecting cover, the bottom of the connecting cover is fixed to a fixing platform via the connecting column, and an air inlet hood is provided at the bottom of the fixing platform; A rotating expansion assembly is provided on the top of the fixed platform, and the rotating expansion assembly includes a rotating platform rotatably connected to the connecting column. Telescopic push rods are evenly provided on the sides of the rotating platform. The outer bottom end of the telescopic push rod is connected to a push plate through a limiting telescopic rod. Directional wheels are evenly installed on the bottom of the push plate. A wear compensation assembly is provided inside the fixed platform.

[0007] Preferably, a slide groove is provided on the top of the fixed platform, and a slider is installed on the bottom of the telescopic push rod. The slider slides within the slide groove in a limited manner, and the slide groove is configured as an arc-shaped inclined structure.

[0008] Preferably, electric cylinders 2 are embedded in both sides of the inner bottom wall of the fixing platform, and the output ends of the two electric cylinders 2 are fixedly connected to the two sides of the top of the air intake hood respectively.

[0009] Preferably, a large gear is provided on the outer fixing sleeve of the connecting column, the outer side of the large gear is meshedly connected to a small gear driven to rotate by a motor, and the small gear is rotatably connected to the inner top wall of the fixing platform through a rotating shaft.

[0010] Preferably, a paving plate is installed on the top of the base, and a hole adapted to the detection cavity is opened in the middle of the paving plate. The detection cavity is adapted to the hole at the bottom of the air intake hood and remains consistent in the vertical direction.

[0011] Preferably, the wear compensation assembly includes a rotating ring rotatably connected to the fixed table, and screw rod 1 is installed on both sides of the rotating ring through a motor, and screw rod 2 is installed on the bottom of the screw rod 1 for vertical sliding limitation, and a sealing plate is installed at the bottom of the screw rod 2, and a rubber pad is fixed to the bottom of the sealing plate.

[0012] Preferably, the sealing plate is embedded in the bottom of the air intake hood, and connecting blocks are installed on both sides of the top of the sealing plate. The connecting block is sleeved on the spiral rod 2, and the inner wall of the connecting block and the inner wall of the rotating ring are both provided with protrusions. The protrusions of the rotating ring and the connecting block respectively fit and slide with the spiral tracks of the spiral rod 1 and the spiral rod 2.

[0013] 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 installed laterally and telescopically on the inner wall of the pushing plate.

[0014] Preferably, the bottom of the telescopic push rod is fixed to the telescopic end of the position-limiting telescopic rod, and the bottom of the position-limiting telescopic rod is embedded in the cavity at the top of the push plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a rotating expansion component, a fixed platform and a slide groove, so that hot-melt adhesive films of different shapes can be arbitrarily laid on the top of the paving plate. The fixed platform is moved downward, and the hot-melt adhesive film is contacted by the directional wheel. The motor drives the telescopic push rod to rotate and extend synchronously, and then the hot-melt adhesive film is quickly rotated and unfolded at multiple force points. This can not only quickly unfold the hot-melt adhesive film and avoid the hot-melt adhesive film from being wrinkled and affecting the detection effect, but also prevent the hot-melt adhesive film from being damaged by uneven tension during the unfolding process.

[0016] 2. The present invention provides a detection chamber, an electric cylinder 2, an air intake hood and a sealing plate. After the hot-melt adhesive film is unfolded, the air intake hood can be stably moved downward by the extension and contraction of the output ends of the two electric cylinders 2, so as to adhere to and press the hot-melt adhesive film, and form a closed reaction chamber and detection chamber through the sealing plate. The micro air pump is started to pressurize and supply air into the reaction chamber through the internal space and the bottom hole of the air intake hood. The high-precision pressure sensor senses the change in air pressure in the detection cavity. At the same time, the rotating expansion component keeps the outer ring of the hot-melt adhesive film in a squeeze state. This can not only quickly and conveniently detect whether the hot-melt adhesive film is damaged, but also prevent the hot-melt adhesive film from loosening during the detection process, resulting in inaccurate detection results.

[0017] 3. The present invention, by providing a wear compensation component, can start two motors synchronously through the PLC controller manually when the rubber pad at the bottom of the sealing plate and the directional wheel are worn, driving the rotating ring and the sealing plate to descend synchronously in the vertical direction 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 is synchronously moved down 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, the directional wheel can unfold the workpiece at a predetermined position, and on the other hand, the air intake hood is moved down a constant distance to achieve internal sealing and air intake. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the electric cylinder 1 of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a structural schematic diagram of the fixing platform of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at B in the middle; Figure 6 This is a schematic diagram of the installation structure of the directional wheel of the present invention; Figure 7 It is a structural schematic diagram of the rotary expansion assembly of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at C in the middle; Figure 10 This is a schematic diagram of the installation structure of the electric cylinder 2 of the present invention; Figure 11 It is a structural schematic diagram of the spiral rod 2 of the present invention.

[0019] In the figure: 1. Box body; 2. Base; 201. Paving plate; 202. Detection chamber; 3. PLC controller; 4. Electric cylinder 1; 5. Connecting cover; 501. Connecting column; 6. Fixed platform; 601. Slide; 7. Rotating platform; 701. Telescopic push rod; 702. Push plate; 703. Positioning telescopic rod; 704. Large gear; 705. Small gear; 706. Directional wheel; 707. Slider; 8. Air intake hood; 801. Sealing plate; 802. Connecting block; 803. Electric cylinder 2; 9. Rotating ring; 901. Screw rod 1; 902. Screw rod 2; 903. Telescopic connecting rod. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0021] See also Figures 1-11 The present invention provides a technical solution: a sealing performance test device for hot melt adhesive film, comprising a box body 1, a base 2 fixedly connected to the bottom of the box body 1, a detection cavity 202 opened in the middle of the top of the base 2, a high-precision pressure sensor is set inside the detection cavity 202, which can monitor the slight pressure changes in the detection cavity 202 in real time, with a measurement range of 0-100kPa and an accuracy of ±0.5%FS, a PLC controller 3 is installed on the top of the box body 1, and the PLC controller 3 has a human-computer interaction interface that can display test data in real time, and the box body 1 An electric cylinder 4 is installed in the middle of the inner bottom wall, and the output end of the electric cylinder 4 is fixedly connected to the connecting cover 5. A connecting column 501 is fixed to the middle of the bottom of the connecting cover 5. The bottom of the connecting cover 5 is fixed to a fixing platform 6 through the connecting column 501. An air intake cover 8 is provided at the bottom of the fixing platform 6. A micro air pump can be used to pressurize and input gas into the air intake cover 8. The electric cylinder 4 is manually started through the button of the PLC controller 3. The electric cylinder 4 serves as a guide electric cylinder. The extension and retraction of the output end of the electric cylinder 4 can drive the connecting cover 5, the fixing platform 6 and the air intake cover 8 to move stably up and down. The top of the fixed platform 6 is provided with a rotating expansion component, which includes a rotating platform 7 rotatably connected to the connecting column 501. The sides of the rotating platform 7 are evenly provided with telescopic push rods 701. Multiple telescopic push rods 701 can evenly expand the hot melt adhesive film in multiple directions during the rotation process, and make the fulcrums evenly dispersed to prevent the hot melt adhesive film from being pulled and damaged during the expansion process. The outer bottom end of the telescopic push rod 701 is connected to a push plate 702 through a limiting telescopic rod 703. The bottom of the push plate 702 is evenly installed with a directional wheel 706. The inner bottom end of the fixed platform 6 The part is provided with a wear compensation component, and multiple directional wheels 706 can disperse the force of each telescopic push rod 701 on the hot melt adhesive film, so that the overall force points on the hot melt adhesive film are dispersed more finely and evenly. The rotation direction of each directional wheel 706 is consistent with the moving trajectory of its own thrust point, which is convenient for the rotation of the expansion component and can also prevent the hot melt adhesive film from being wrinkled by the rotation of the directional wheel 706 during the rotation and expansion process. In addition, the wheel material of the directional wheel 706 is rubber, which can increase the friction with the hot melt adhesive film and more smoothly and gently unfold the hot melt adhesive film on the top of the paving plate 201.

[0022] As an embodiment of the present invention, a slide groove 601 is provided on the top of the fixed platform 6, and a slider 707 is installed at the bottom of the telescopic push rod 701. The slider 707 slides in the slide groove 601 within a limited position. The slide groove 601 is set to an arc-shaped inclined structure. The slider 707 moves along the slide groove 601 in the direction away from the center of the circle, and moves the telescopic end of the telescopic push rod 701 outward, thereby driving the push plate 702 to move steadily in the direction away from the center of the circle and quickly unfold the hot melt adhesive film through the directional wheel 706. The curvature of multiple slide grooves 601 is consistent, which can ensure that the extended length of each telescopic push rod 701 is consistent, so that the force on the hot melt adhesive film is always uniform during the unfolding process, thereby increasing the unfolding efficiency of the hot melt adhesive film and preventing the hot melt adhesive film from being damaged due to uneven force.

[0023] As an embodiment of the present invention, electric cylinders 2 803 are embedded on both sides of the inner bottom wall of the fixed platform 6. The output ends of the two electric cylinders 2 803 are fixedly connected to the two sides of the top of the air intake hood 8 respectively. The two electric cylinders 2 803 are electrically connected to the PLC controller 3. The output ends of the two electric cylinders 2 803 can be driven to extend and retract manually through the PLC controller 3, thereby driving the air intake hood 8 to move up and down stably.

[0024] As an embodiment of the present invention, a large gear 704 is provided on the fixed sleeve outside the connecting column 501, and the outer side of the large gear 704 is meshed with a small gear 705 driven to rotate by the 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.

[0025] As an embodiment of the present invention, a paving plate 201 is installed on the top of the base 2, and a hole adapted to the detection cavity 202 is opened in the middle of the paving plate 201. The detection cavity 202 is adapted to the hole at the bottom of the air inlet hood 8 and is consistent in the vertical direction. The surface of the paving plate 201 is smooth, which can reduce the wear of the hot melt adhesive film during the unfolding process on the top of the paving plate 201, and the paving plate 201 is fixedly connected to the top of the base 2 by screws at the four corners, which is convenient for replacement after the surface of the paving plate 201 is worn. After the hot melt adhesive film is unfolded on the surface of the paving plate 201, the air inlet hood 8 is pressed down to the top of the hot melt adhesive film and fits it with it, so that the hole at the bottom of the air inlet hood 8 is aligned with the detection cavity 202, and a reaction cavity is quickly formed between the air inlet hood 8 and the hot melt adhesive film. By inputting gas into the reaction cavity and detecting whether there is a change in air pressure in the detection cavity 202, hot melt adhesive films of various shapes can be quickly and softly unfolded and air tightness detection can be performed.

[0026] The specific implementation is as follows. When in use, hot melt adhesive films of various shapes can be spread on the top of the paving plate 201. The electric cylinder 1 4 is manually started through the PLC controller 3 to drive the fixed platform 6 to move down. When the directional wheel 706 contacts the hot melt adhesive film and fits with it, the motor rotates automatically, driving the rotating platform 7 and the telescopic push rod 701 to rotate along the slide 601. Under the action of the slider 707, each telescopic push rod 701 gradually extends in the direction away from the center of the circle, respectively driving the push plate 702 and the directional wheel 706 at the bottom thereof to move outward while rotating until the hot melt adhesive film is fully unfolded. Then, the two electric cylinders 2 803 are synchronously started through the PLC controller 3 to drive the air intake hood 8 to descend until the hot melt adhesive film is pressed together, and the high-precision test chamber 202 is detected. The pressure sensor detects the pressure value at this time and feeds the data back to the human-computer interaction interface. A reaction chamber is formed between the air inlet hood 8 and the hot-melt adhesive film. The pressure value and test time to be tested are set in the PLC controller 3 according to different hot-melt adhesive films. The micro air pump is started to supply air to the reaction chamber for pressurization. At the same time, the rotating expansion component keeps the outer ring of the hot-melt adhesive film in an extrusion state to ensure that the hot-melt adhesive film is not loose. After reaching the preset value, the micro air pump automatically stops operating. At the same time, the human-computer interaction interface is used to observe whether the pressure value in the detection chamber 202 changes. If the pressure value in the detection chamber 202 rises, it indicates that the hot-melt adhesive film is damaged. On the contrary, if the pressure value in the detection chamber 202 remains unchanged, it indicates that the hot-melt adhesive film is intact and of qualified quality.

[0027] As an embodiment of the present invention, the wear compensation assembly includes a rotating ring 9 rotatably connected to the fixed table 6, and screw rods 1 901 are installed on both sides of the rotating ring 9 through motors, and screw rods 2 902 are installed on the bottom of screw rod 1 901 for vertical sliding. The thread directions of screw rods 1 901 and screw rods 2 902 on both sides are opposite, and the two motors are electrically connected to the PLC controller 3. A sealing plate 801 is installed at the bottom of screw rod 2 902, and a rubber pad is fixed at the bottom of the sealing plate 801. The sealing plate 801 can increase the friction between the air intake hood 8 and the hot melt adhesive film, so that the air intake hood 8 and the hot melt adhesive film fit more closely, and the hot melt adhesive film and the paving plate 201 fit more closely, forming a more closed reaction chamber and test chamber, so that the test results are more accurate, and limiting blocks are set on both sides of screw rod 2 902. The top of screw rod 2 902 can slide up and down at the bottom of screw rod 1 901, but cannot rotate left and right at the bottom of screw rod 1 901.

[0028] As an embodiment of the present invention, the sealing plate 801 is embedded in the bottom of the air intake hood 8, and connecting blocks 802 are installed on both sides of the top of the sealing plate 801. The connecting block 802 is sleeved on the 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 respectively fit and slide with the spiral tracks of the spiral rod 1 901 and the spiral rod 2 902.

[0029] As an embodiment of the present invention, telescopic connecting rods 903 are evenly arranged on the outer side of the rotating ring 9, and the outer ends of the telescopic connecting rods 903 are laterally telescopically installed on the inner wall of the pushing plate 702. The two telescopic connecting rods 903 support the pushing plate 702, and the telescopic connecting rods 903 can drive the pushing plate 702 and the directional wheel 706 to move downward synchronously with the rotating ring 9.

[0030] As an 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, and the bottom of the limiting telescopic rod 703 is embedded in the cavity at the top of the push plate 702. The telescopic end of the telescopic connecting rod 903 can be extended as the push plate 702 moves outward, and the limiting telescopic rod 703 is extended and fixed as the push plate 702 moves downward, which also plays a role in supporting the telescopic push rod 701 upward. Long-term operation will cause synchronous wear of the rubber pad, which may easily cause the air intake hood 8 to be unable to fit tightly with the hot melt adhesive film. , the sealing of the reaction chamber and the test chamber is weakened, and the two motors are started synchronously through the PLC controller 3. The output ends of the two motors rotate in opposite directions, driving the screw rod 1 901 and the screw rod 2 902 on both sides to rotate synchronously in opposite directions, thereby driving 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 cover 8, and the directional wheel 706 moves downward synchronously to maintain a relative position with the rubber pad at the bottom of the sealing plate 801, thereby compensating for the wear of the rubber pad at the bottom of the sealing plate 801.

[0031] Working principle: Hot melt adhesive films of various shapes can be laid on the top of the paving plate 201, and the electric cylinder 1 4 is started by the PLC controller 3 to drive the fixed platform 6 to move downward. 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 direction of the slide 601. Under the action of the slider 707, each telescopic push rod 701 gradually extends in the direction away from the center of the circle, respectively driving the push plate 702 and the directional wheel 706 at the bottom thereof to move outward while rotating. The directional wheel 706 can rotate horizontally until the hot melt adhesive film is fully unfolded, and then the two electric cylinders 2 803 are synchronously started by the PLC controller 3 to drive the air intake hood. 8 descends 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 cover 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 to the reaction chamber for pressurization. After reaching the preset value, the micro air pump automatically stops operating. At the same time, the human-computer interaction interface is used to observe whether the pressure value in the detection chamber 202 changes. If the pressure value in the detection chamber 202 rises, it means that the hot melt adhesive film is damaged. On the contrary, if the pressure value in the detection chamber 202 remains unchanged, it means that the hot melt adhesive film is intact and of qualified quality. The two motors are started synchronously by the PLC controller 3 at regular intervals. The output ends of the two motors rotate in opposite directions, driving the screw rod 1 901 and the screw rod 2 902 on both sides to rotate synchronously in opposite directions, thereby driving 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, and the wear of the rubber pad at the bottom of the sealing plate 801 is supplemented, so that the air intake hood 8 is lowered a constant distance to achieve sealing and subsequent detection. At the same time, the directional wheel 706 is synchronously moved down to maintain a relative position with the sealing plate 801, so as to facilitate the supplement of the wear of the directional wheel 706 and improve the long-term testing effect of the workpiece.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

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

2. The sealing performance testing device for hot melt adhesive film according to claim 1, characterized in that: A slide 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 slide groove (601) in a limited manner. The slide groove (601) is configured 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 inner bottom wall of the fixed platform (6), and the output ends of the two electric cylinders 2 (803) are fixedly connected to the two sides of the top of the air intake cover (8) respectively.

4. The sealing performance testing device for hot melt adhesive film according to claim 3, characterized in that: A large gear (704) is provided on the outer fixed sleeve of the connecting column (501). The outer side of the large gear (704) is meshedly connected to a small gear (705) driven to rotate by a motor. The small gear (705) is rotatably connected to the inner top wall of the fixed platform (6) via a rotating shaft.

5. The sealing performance testing device for hot melt adhesive film according to claim 4, characterized in that: A paving plate (201) is installed on the top of the base (2), and a hole adapted to the detection cavity (202) is provided in the middle of the paving plate (201). The detection cavity (202) is adapted to the hole at the bottom of the air inlet hood (8) and is kept 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), screw rods 1 (901) are installed on both sides of the rotating ring (9) through a motor, screw rods 2 (902) are installed on the bottom of the screw rods 1 (901) in a limited vertical sliding manner, a sealing plate (801) is installed on the bottom of the screw rods 2 (902), and a rubber pad is fixed to 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 cover (8), and connecting blocks (802) are installed on both sides of the top of the sealing plate (801). The connecting block (802) is sleeved on the second screw 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 fitted and slid with the spiral tracks of the first screw rod (901) and the second screw 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 ends of the telescopic connecting rods (903) are installed in a transverse telescopic manner on the inner wall of the pushing 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 position-limiting telescopic rod (703), and the bottom of the position-limiting telescopic rod (703) is embedded in the top cavity of the pushing plate (702).

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