A device and method for detecting the compression resistance of paperboard

Abstract

This invention relates to the field of pressure testing devices, specifically a device and method for testing the compressive strength of cardboard. The device includes a testing seat, a pressure applying component mounted on the testing seat for applying stable pressure to the cardboard, a support platform mounted on the testing seat, a fixing mechanism mounted within the support platform, and a humidifying mechanism mounted within the fixing mechanism for supplying humid airflow to the cardboard. The fixing mechanism includes a support component, a limiting component, and a snap-fit ​​component. The support component is mounted within the testing seat and supports the limiting component. The limiting component is mounted on the support component. This invention achieves the limiting of the cardboard and, after the compressive strength test begins, removes the support for the cardboard and supports the bottom of the cardboard through the limiting component, the pressing component, and the spray plate, avoiding the situation where the bottom of the cardboard is hollowed out or subjected to pushing force, which would affect the accuracy of the cardboard compressive strength test and ensure that the cardboard can be subjected to stable pressure.

Description

Technical Field

[0001] This invention relates to the field of pressure testing devices, and specifically to a device and method for testing the compressive strength of cardboard. Background Technology

[0002] After corrugated paperboard and other paperboards are produced, samples that meet the specifications are cut out. Then, the paperboard samples are placed in a compression resistance testing device, which applies stable pressure to the paperboard samples to test their compression resistance.

[0003] Chinese invention patent CN114441305B, authorized by patent announcement number CN114441305B, discloses a device for testing the compressive strength of corrugated cardboard, relating to the field of corrugated cardboard technology. The device includes six electrically operated telescopic rods on the upper outer side of a circular shock-absorbing chassis. A test disc is mounted on the upper end of each telescopic rod, an information terminal is mounted above the test disc, and a pressure column is mounted on the lower end of the test disc. Six shape recognition columns are mounted above the circular shock-absorbing chassis, and a spring-loaded plate is mounted on the upper end of the circular shock-absorbing chassis. This prior art addresses the problem that existing corrugated cardboard strength tests, which use impact testing, suffer from a simplistic testing structure, resulting in uneven testing force and reduced testing effectiveness.

[0004] However, when testing corrugated paper, it needs to be held vertically for compression testing. This necessitates the use of clamps to hold and secure the paper. These clamps require manual placement, and due to the limited space within the testing device, removing the clamps during compression testing is inconvenient. This provides additional support to the paperboard, increasing its compression resistance and thus affecting the test data. Furthermore, current technology cannot simulate the compression resistance testing of corrugated paper under humid conditions. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a device and method for testing the compressive strength of cardboard.

[0006] The technical solution of the present invention: a cardboard compression resistance testing device, comprising a testing seat, a pressure applying component mounted on the testing seat for applying stable pressure to the cardboard, a support platform mounted on the testing seat, a fixing mechanism mounted within the support platform, and a humidifying mechanism mounted within the fixing mechanism for conveying humid airflow to the cardboard; the fixing mechanism includes a support component, a limiting component, and a snap-fit ​​component; the support component is mounted within the testing seat for supporting the limiting component; the limiting component is mounted on the support component for limiting the cardboard; snap-fit ​​components are respectively mounted on the limiting component, the support component, and the support platform for fixing the snap-fit ​​component; the cardboard is placed within the limiting component, and the limiting component limits the cardboard.

[0007] Preferably, the support assembly includes a lifting unit and a lifting component; the lifting unit is installed inside the support platform and is used to drive the lifting component to move up and down inside the support platform; the lifting component is installed on the lifting end of the lifting unit.

[0008] Preferably, the limiting component includes a limiting member, a pressing member, and a spray plate; the fixed ends of the limiting member, the pressing member, and the spray plate are all installed on the support component, and the movable ends pass through the support platform.

[0009] Preferably, the snap-fit ​​assembly includes an elastic element two, a support plate, a push rod, a snap-fit ​​rod, a tapered rod, and snap-fit ​​units; the two ends of the elastic element two are respectively connected to the inner wall of the support platform and the support plate; the snap-fit ​​rod is installed at the top of the support plate, and the tapered rod is installed at the bottom of the support plate and located on the moving path of the push rod; the push rod is installed on the lifting end of the support assembly; there are multiple snap-fit ​​units, and the multiple snap-fit ​​units are respectively installed on multiple movable ends of the limiting assembly.

[0010] Preferably, the snap-fit ​​unit includes an elastic element and a snap-fit ​​block; the two ends of the elastic element are respectively connected to the movable end of the limiting component and the snap-fit ​​block; the snap-fit ​​block descends and snaps into the snap-fit ​​rod.

[0011] Preferably, the humidification mechanism includes a connecting pipe, a water mist unit, an air blowing unit, a control unit, and a jet spray unit; the connecting pipe is connected to the control unit; the water mist unit and the air blowing unit are both installed at the input end of the connecting pipe; the jet spray unit is installed on the control unit.

[0012] Preferably, the control unit includes a first control cylinder, a first control component, a second control cylinder, a second control component, and a pressing plate; the pressing plate is installed at the bottom of the limiting component; both the first control cylinder and the second control cylinder are installed on the connecting pipe, and the first control cylinder and the second control cylinder are connected to each other on the connecting pipe; the bottom end of the first control component is installed at the bottom of the inner cavity of the first control cylinder, and the top end is located below the pressing component; the bottom end of the second control component is installed at the bottom of the inner cavity of the second control cylinder, and the top end is located below the pressing plate.

[0013] Preferably, there are multiple jet units, the input ends of which are respectively connected to control cylinder one and control cylinder two, and the output ends are respectively installed in the pressure member and the spray plate; the jet unit includes a round tube and a jet pipe; the multiple round tubes are respectively connected to control cylinder one and control cylinder two; the multiple jet pipes are respectively installed in the pressure member and the spray plate, the jet pipe installed in the pressure member faces the top of the pressure member, and the jet pipe installed in the spray plate faces the side of the spray plate.

[0014] This invention also provides a method for testing the compressive strength of paperboard, using the aforementioned paperboard compressive strength testing device, comprising the following steps: S1. Press the cardboard onto the limiting member. The number of limiting members pressed on cardboard of different thicknesses is also different. The further back the cardboard is, the more limiting members are pressed. The pressed limiting members are positioned by the snap-fit ​​component. The limiting members on the side of the cardboard provide auxiliary support for the cardboard. S2. The control unit below the pressed limiter opens, the jet unit inside these limiters passes through, and a moist airflow is sprayed upward from the bottom of the cardboard. The moist airflow passes through the inside of the cardboard, making the cardboard moist. S3. The pressure application component applies stable pressure to the cardboard. In the initial stage of pressure application and the initial stage of cardboard compression, the lifting unit is activated to drive the lifting components to descend, causing all the limiting components, pressing components and spray plates to descend. After that, the cardboard compression resistance test value is displayed on the test seat.

[0015] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: The staff places the cardboard on the limiting piece and presses it down. The thicker the cardboard, the more limiting pieces are pressed down. The descending limiting piece presses down on the corresponding control piece one. Control piece one descends away from the connection between control cylinder one and the round tube, so that the corresponding support platform, control cylinder one and the round tube are connected. At this time, the water mist unit and the air blowing unit are activated to generate an airflow with water mist that is blown out from the round tube and the air jet pipe into the cardboard. The humid airflow passes through the cardboard and moistens it, thereby simulating the cardboard's compressive strength test in a humid environment.

[0016] The thicker the cardboard, the more limiting components are pressed down. At this time, the limiting components on the side of the cardboard provide auxiliary support. The elastic element inside the pressed limiting component engages with the locking rod on the support plate, thereby limiting the limiting component at the bottom of the cardboard and preventing the elasticity of the limiting component from being applied to the cardboard. When the drive unit drives the pressure unit to apply pressure to the cardboard, the cardboard can stand up on its own after being subjected to pressure. The lifting unit drives the lifting component to descend as a whole, so that the limiting component, the pressing component, and the spray plate are all engaged with the locking rod. This prevents the limiting component, the pressing component, and the spray plate from applying pressure to the cardboard in the opposite direction, thus achieving the limitation of the cardboard. After the compression test begins, the support for the cardboard is removed, and the bottom of the cardboard is supported by the limiting component, the pressing component, and the spray plate to prevent the bottom of the cardboard from being hollowed out and subjected to pushing force, which would affect the accuracy of the cardboard compression test and ensure that the cardboard can be subjected to stable pressure.

[0017] When the cardboard is laid flat for compression testing, the cardboard presses down on the lower pressure component. At this time, the pressing plate presses down on the second control component, causing the second control component to block the connection between the second control cylinder and the connecting pipe. This prevents the airflow from entering the jet pipe inside the limiting component. Meanwhile, the pressing plate presses down on the control component below the spray plate, allowing the airflow to enter the jet pipe inside the spray plate along the circular pipe. The humid airflow is then blown from the side of the cardboard into the interior of the cardboard through the corresponding jet pipe. This ensures that the cardboard is evenly moistened in both vertical and flat compression tests, simulating a humid environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the spray plate proposed in this invention; Figure 3 This is a schematic diagram of the structure of the pressing component proposed in this invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the limiting member proposed in this invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of the jet pipe structure proposed in this invention; Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle; Reference numerals: 1. Detection seat; 2. Drive unit; 3. Pressing unit; 4. Support platform; 5. Lifting unit; 6. Lifting component; 7. Limiting component; 8. Pressing component; 9. Elastic component one; 10. Snap-fit ​​block; 11. Elastic component two; 12. Support plate; 13. Push rod; 14. Connecting pipe; 15. Water mist unit; 16. Air blowing unit; 17. Control cylinder one; 18. Control component one; 19. Control cylinder two; 20. Control component two; 21. Round tube; 22. Air jet pipe; 23. Pressing plate; 24. Spray plate; 25. Snap-fit ​​rod; 26. Conical rod. Detailed Implementation

[0019] Example 1, as Figures 1-8As shown, the present invention proposes a cardboard compression resistance testing device, comprising a testing base 1, a pressure applying component mounted on the testing base 1 for applying stable pressure to the cardboard, a support platform 4 mounted on the testing base 1, a fixing mechanism mounted within the support platform 4, and a humidifying mechanism mounted within the fixing mechanism for supplying humid airflow to the cardboard; the fixing mechanism includes a support component, a limiting component, and a locking component; the support component is mounted within the testing base 1 for supporting the limiting component; the limiting component is mounted on the support component for limiting the cardboard; the locking component is mounted on the limiting component, the support component, and the support platform 4 respectively for fixing the locking component; the cardboard is placed within the limiting component, and the limiting component limits the cardboard; the pressure applying component includes a driving unit 2 and a pressure applying unit 3; the driving unit 2 is mounted on the testing base 1, and the pressure applying unit 3 is mounted on the lifting end of the driving unit 2 for applying stable pressure to the cardboard on the support platform 4. In the prior art, the driving unit 2 drives the pressure applying unit 3 to descend and apply pressure to the cardboard on the support platform 4 to perform a compression resistance test.

[0020] The support assembly includes a lifting unit 5 and a lifting component 6; the lifting unit 5 is installed inside the support platform 4 and is used to drive the lifting component 6 to move up and down within the support platform 4; the lifting component 6 is installed on the lifting end of the lifting unit 5; the lifting unit 5 can be a motor, a ball screw, and a guide rod, the ball screw is installed on the output shaft of the motor, the motor is installed inside the support platform 4, the guide rod is installed inside the support platform 4, and the lifting component 6 is threadedly engaged with the ball screw and the guide rod. The lifting unit 5 can also be driven by a cylinder to lift the lifting component 6.

[0021] The limiting assembly includes a limiting member 7, a pressing member 8, and a spray plate 24. The fixed ends of the limiting member 7, the pressing member 8, and the spray plate 24 are all installed on the support assembly, and the movable ends pass through the support platform 4. When the cardboard is placed vertically on the support platform 4 for edge crush strength testing, the cardboard is placed vertically on the limiting member 7, and the operator applies downward pressure to press down the limiting member 7 below the cardboard. When the cardboard is placed flat on the support platform 4 for flat crush strength testing, the cardboard is laid flat. The cardboard is cut into the same size disc shape. At this time, the cardboard will press down on the pressing member 8, and the side will be in contact with the spray plate 24, thus realizing the limiting of the flat cardboard by the spray plate 24, which makes it convenient for the operator to place the cardboard in the designated position. Different types of cardboard have different thicknesses, so the number of limiting members 7 pressed by cardboard of different thicknesses is also different. The number of limiting members 7 and corresponding components can be set as needed.

[0022] The limiting component 7, the pressing component 8, and the spray plate 24 are composed of a rectangular component at the top and an elastic component 3 at the bottom. The bottom end of the elastic component 3 is connected to the lifting component 6. The elastic component 1 9, the elastic component 2 11, and the elastic component 3 are all composed of a spring 1 and a telescopic rod.

[0023] The snap-fit ​​assembly includes an elastic element 11, a support plate 12, a push rod 13, a snap-fit ​​rod 25, a tapered rod 26, and snap-fit ​​units. The two ends of the elastic element 11 are connected to the inner wall of the support platform 4 and the support plate 12, respectively. The snap-fit ​​rod 25 is installed at the top of the support plate 12, and the tapered rod 26 is installed at the bottom of the support plate 12 and located on the moving path of the push rod 13. The push rod 13 is installed on the lifting end of the support assembly. There are multiple snap-fit ​​units, each installed on a multiple movable end of the limiting assembly. The snap-fit ​​block 10 on the limiting member 7, which is pressed down by the vertical cardboard, snaps with the snap-fit ​​rod 25. At this time, the snap-fit ​​rod 25 limits the limiting member 7, preventing pressure on the cardboard above the limiting member 7. When the lifting member 6 descends, the limiting member 7, the pressing member 8, and the spray plate... 24 descends, and the corresponding locking block 10 engages with the locking rod 25. At this time, the lifting unit 5 can drive the lifting component 6 to rise a certain distance, so that the limiting component 7, the pressing component 8, and the elastic component 3 at the bottom of the spray plate 24 are in a compressed state. Thus, when the limiting component 7, the pressing component 8, and the spray plate 24 are subjected to the pressure of the cardboard, they are still at the same level as the top of the support platform 4. After the cardboard compression test is completed, the lifting unit 5 is activated to drive the lifting component 6 to rise, and the pushing rod 13 pushes the conical rod 26 to push the support plate 12 toward the direction of the elastic component 21, so that the locking rod 25 separates from the locking block 10. At this time, the elasticity of the limiting component 7, the pressing component 8, and the spray plate 24 drives the limiting component 7, the pressing component 8, and the spray plate 24 to extend out of the support platform 4 and reset.

[0024] The snap-fit ​​unit includes an elastic element 9 and a snap-fit ​​block 10; the two ends of the elastic element 9 are respectively connected to the movable end of the limiting component and the snap-fit ​​block 10; the snap-fit ​​block 10 descends and snaps into the snap-fit ​​rod 25.

[0025] Example 2, as Figures 1-3 and Figures 5-8 As shown, the paperboard compression resistance testing device proposed in this invention, compared with Embodiment 1, has a moisture mechanism including a connecting pipe 14, a water mist unit 15, an air blowing unit 16, a control unit, and an air jet unit; the connecting pipe 14 is connected to the control unit; the water mist unit 15 and the air blowing unit 16 are both installed at the input end of the connecting pipe 14; the air jet unit is installed on the control unit; the water mist unit 15 can be composed of an atomizing nozzle, a water pump, and a rectangular box, the rectangular box is connected to the connecting pipe 14, the atomizing nozzle is located in the rectangular box and connected to the output end of the water pump, blowing gas into the connecting pipe 14, the airflow comes into contact with the water mist and becomes a moist airflow, and the moist airflow is then transported along the connecting pipe 14.

[0026] The control unit includes a control cylinder 17, a control component 18, a control cylinder 29, a control component 20, and a pressing plate 23; the pressing plate 23 is installed at the bottom of the limiting component 7; both control cylinders 17 and 29 are installed on the connecting pipe 14, and are connected to each other on the connecting pipe 14; the bottom end of control component 18 is installed at the bottom of the inner cavity of control cylinder 17, and its top end is located below the pressing component 8; the bottom end of control component 20 is installed at the bottom of the inner cavity of control cylinder 29, and its top end is located below the pressing plate 23; both control component 18 and control component 20 are composed of a spring 2, a plug, and a round rod, with spring 2 installed... At the bottom of the blocking part, a round rod is installed at the top of the blocking part. In the initial state, the blocking part of control component 18 blocks control cylinder 17 and round tube 21, while the blocking part of control component 20 is located above the connection between control cylinder 29 and connecting tube 14. When the round rods of control component 18 and control component 20 are pressed down, since the round rod of control component 18 is longer than the round rod of control component 20, the distance that control component 18 descends is longer than the distance that control component 20 descends. Control component 18 descends away from the connection between control cylinder 17 and round tube 21, while control component 20 descends to block the connection between control cylinder 29 and connecting tube 14.

[0027] There are multiple air jet units. The input ends of the multiple air jet units are respectively connected to control cylinder 17 and control cylinder 29, and the output ends are respectively installed in the pressure member 8 and the spray plate 24. The air jet unit includes a circular tube 21 and an air jet pipe 22. Multiple circular tubes 21 are respectively connected to control cylinder 17 and control cylinder 29. Multiple air jet pipes 22 are respectively installed in the pressure member 8 and the spray plate 24. The air jet pipes 22 installed in the pressure member 8 face upwards, and the air jet pipes 22 installed in the spray plate 24 face the side of the spray plate 24. During the paperboard edge crush strength test... Moisturizing airflow is sprayed upwards from the jet pipe 22 inside the limiting member 7. During the cardboard flat crush strength test, the jet pipe 22 inside the spray plate 24 blows the cardboard from the side to the cardboard. This prevents the moisturizing airflow from blowing out from the bottom of the cardboard when it is laid flat, which would block the top of the jet pipe 22 inside the limiting member 7 and prevent the cardboard from being moistened evenly. Furthermore, since the wavy gap is through from left to right when the cardboard is laid flat on the limiting member 7, but not through from the top and bottom, the moisturizing efficiency of the gas blown out from the bottom when the cardboard is laid flat is relatively low.

[0028] Example 3, as Figures 1-8 As shown, the present invention proposes a method for testing the compressive strength of paperboard, which uses the paperboard compressive strength testing device described in Example 1, and includes the following steps: S1. Press the cardboard onto the limiting member 7. The number of limiting members 7 pressed on cardboard of different thicknesses is also different. The further back the cardboard is, the more limiting members 7 are pressed. The pressed limiting members 7 are positioned by the snap-fit ​​assembly. The limiting members 7 on the side of the cardboard provide auxiliary support for the cardboard. S2. The control unit below the pressed limit member 7 opens, the jet unit inside these limit members 7 passes through, and a moist airflow is sprayed upward from the bottom of the cardboard. The moist airflow passes through the inside of the cardboard, making the cardboard moist. S3. The pressure application component applies stable pressure to the cardboard. In the initial stage of pressure application and the initial stage of cardboard compression, the lifting unit 5 is activated to drive the lifting component 6 to descend, causing all the limiting components 7, the pressing component 8 and the spray plate 24 to descend. Then, the cardboard compression resistance test value is displayed on the detection seat 1.

[0029] In summary, in this invention, when the water supply pipe is connected to the input end of the water mist unit 15 and the edge crush strength of the cardboard is tested, the operator places the cardboard on the limiting member 7 and presses down the corresponding number of limiting members 7. The locking block 10 on the limiting member 7 then descends and locks with the locking rod 25. The limiting member 7 also presses down the corresponding control member 18, so that the blocking part of the control member 18 leaves the connection between the control cylinder 17 and the round tube 21, so that the connecting pipe 14 is connected to the control cylinder 17 and the round tube 21. Then, the water mist unit 15 and the blowing unit 16 are activated to generate a humid airflow. The humid airflow is transported along the connecting pipe 14 to the through round tube 21. Then, the humid airflow is blown upward through the jet pipe 22 into the wavy gap of the cardboard and passes through the gap, evenly wetting the cardboard. At this time, the limiting member 7 on the side of the cardboard supports the cardboard, so that the cardboard is placed stably and vertically.

[0030] When conducting the flat crush strength test, the cardboard is placed horizontally on top of all the limiting members 7 and the pressing members 8, and the operator applies pressure to press down the limiting members 7 and the pressing members 8. At this time, the pressing plate 23 drives the control member 20 to descend in the inner cavity of the control cylinder 29. The blocking part of the control member 20 blocks the connection between the control cylinder 29 and the connecting pipe 14, so that the humid airflow will not enter the control cylinder 17 corresponding to the limiting member 7. The pressing plate 23 presses down the control member 18 corresponding to the spray plate 24, so that the humid airflow is delivered from the control cylinder 17 corresponding to the spray plate 24 to the round pipe 21, and then blown out from the air jet pipe 22 to the side of the horizontally placed cardboard to moisten it.

[0031] Next, the drive unit 2 drives the pressure application unit 3 to apply pressure to the cardboard. Since the limiting member 7 is vertical, the cardboard is in a very vertical state without any slight tilt. Therefore, in the initial stage of pressure application, the cardboard will not tilt after receiving slight pressure. The lifting unit 5 is activated to drive the lifting member 6 to descend, so that the limiting member 7, the pressing member 8 and the spray plate 24 all descend and are limited by the locking block 10 and the locking rod 25. Then the lifting member 6 rises a certain distance, so that the elastic member 3 is in a compressed state, so that the top of the limiting member 7, the pressing member 8 and the spray plate 24 and the top of the support platform 4 are on the same horizontal plane, ensuring that the cardboard can be stably pressured.

[0032] After the test is completed, the lifting unit 5 drives the lifting component 6 to rise, and the lifting component 6 drives the push rod 13 to rise a certain distance, pushing the tapered rod 26 a certain distance towards the elastic component 11, so that the locking rod 25 separates from the locking block 10, thereby causing the limiting component 7, the pressing component 8 and the spray plate 24 to rise and reset.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A cardboard compression resistance testing device, comprising a testing seat (1) and a pressure applying component, the pressure applying component being mounted on the testing seat (1) and used to apply stable pressure to the cardboard; characterized in that, Also includes: Support platform (4), which is mounted on the testing seat (1); The fixing mechanism is installed inside the support platform (4); A humidifying mechanism, which is installed within a fixed mechanism and is used to deliver a humid airflow to the cardboard; The fixing mechanism includes a support component, a limiting component and a snap-fit ​​component; the support component is installed in the detection seat (1) and is used to support the limiting component; the limiting component is installed on the support component and is used to limit the cardboard; the snap-fit ​​component is installed on the limiting component, the support component and the support platform (4) respectively and is used to fix the snap-fit ​​component; the cardboard is placed in the limiting component and the limiting component limits the cardboard.

2. The cardboard compression resistance testing device according to claim 1, characterized in that, The support assembly includes a lifting unit (5) and a lifting component (6); the lifting unit (5) is installed inside the support platform (4) and is used to drive the lifting component (6) to move up and down inside the support platform (4); the lifting component (6) is installed on the lifting end of the lifting unit (5).

3. The cardboard compression resistance testing device according to claim 1, characterized in that, The limiting assembly includes a limiting member (7), a pressing member (8), and a spray plate (24); the fixed ends of the limiting member (7), the pressing member (8), and the spray plate (24) are all installed on the support assembly, and the movable ends pass through the support platform (4).

4. The cardboard compression resistance testing device according to claim 1, characterized in that, The snap-fit ​​assembly includes an elastic element 2 (11), a support plate (12), a push rod (13), a snap-fit ​​rod (25), a tapered rod (26), and snap-fit ​​units; the two ends of the elastic element 2 (11) are respectively connected to the inner wall of the support platform (4) and the support plate (12); the snap-fit ​​rod (25) is installed at the top of the support plate (12), and the tapered rod (26) is installed at the bottom of the support plate (12) and located on the moving path of the push rod (13); the push rod (13) is installed on the lifting end of the support assembly; there are multiple snap-fit ​​units, and the multiple snap-fit ​​units are respectively installed on the multiple movable ends of the limiting assembly.

5. The cardboard compression resistance testing device according to claim 4, characterized in that, The snap-fit ​​unit includes an elastic element (9) and a snap-fit ​​block (10); the two ends of the elastic element (9) are respectively connected to the movable end of the limiting component and the snap-fit ​​block (10); the snap-fit ​​block (10) descends and snaps into the snap-fit ​​rod (25).

6. The cardboard compression resistance testing device according to claim 3, characterized in that, The humidification mechanism includes a connecting pipe (14), a water mist unit (15), an air blowing unit (16), a control unit, and a jet unit; the connecting pipe (14) is connected to the control unit; the water mist unit (15) and the air blowing unit (16) are both installed at the input end of the connecting pipe (14); the jet unit is installed on the control unit.

7. The cardboard compression resistance testing device according to claim 6, characterized in that, The control unit includes control cylinder one (17), control component one (18), control cylinder two (19), control component two (20) and pressing plate (23); pressing plate (23) is installed at the bottom of limiting component (7); control cylinder one (17) and control cylinder two (19) are both installed on connecting pipe (14), and control cylinder one (17) and control cylinder two (19) are connected on connecting pipe (14); the bottom end of control component one (18) is installed at the bottom of the inner cavity of control cylinder one (17), and the top end is located below the pressing component (8); the bottom end of control component two (20) is installed at the bottom of the inner cavity of control cylinder two (19), and the top end is located below pressing plate (23); the top end of control component two (20) is lower than the top end of control component one (18); in the initial state, the blocking end of control component one (18) blocks the connection between control cylinder one (17) and round pipe (21).

8. The cardboard compression resistance testing device according to claim 7, characterized in that, There are multiple jet units. The input ends of the multiple jet units are connected to control cylinder one (17) and control cylinder two (19) respectively, and the output ends are installed in the pressure member (8) and the spray plate (24) respectively. The jet unit includes a round tube (21) and a jet pipe (22). Multiple round tubes (21) are connected to control cylinder one (17) and control cylinder two (19) respectively. Multiple jet pipes (22) are installed in the pressure member (8) and the spray plate (24) respectively. The jet pipe (22) installed in the pressure member (8) faces the top of the pressure member (8), and the jet pipe (22) installed in the spray plate (24) faces the side of the spray plate (24).

9. A method for testing the compression resistance of cardboard, using the cardboard compression resistance testing device as described in claim 6, characterized in that, Includes the following steps: S1. Press the cardboard onto the limiting member (7). The number of limiting members (7) pressed on cardboard of different thicknesses is also different. The further back the cardboard is, the more limiting members (7) are pressed. The pressed limiting members (7) are positioned by the snap-fit ​​assembly. The limiting members (7) on the side of the cardboard provide auxiliary support for the cardboard. S2. The control unit below the pressed limit member (7) opens, the jet unit inside these limit members (7) passes through, and a moist airflow is sprayed upward from the bottom of the cardboard. The moist airflow passes through the inside of the cardboard, making the cardboard moist. S3. The pressure application component applies stable pressure to the cardboard. In the initial stage of pressure application, when the cardboard is under pressure, the lifting unit (5) is activated to drive the lifting component (6) to descend, causing all the limiting components (7), the pressing component (8) and the spray plate (24) to descend. Then, the cardboard compression resistance test value is displayed on the test seat (1).

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