Corrugated board strength detection device and detection method

Abstract

This invention discloses a corrugated cardboard strength testing device and method, belonging to the field of corrugated cardboard testing. The corrugated cardboard strength testing device includes a testing platform and a testing disk rotatably connected to the top of the testing platform, the testing disk having a clamping part for fixing the corrugated cardboard; guide rods symmetrically fixed on both sides of the top of the testing platform, with a sealing box slidably sleeved between the two sets of guide rods, and a temperature control part for changing the ambient temperature of the testing environment inside the sealing box. This invention, through the configuration of a compressor and a temperature-conducting pipe, achieves the change of the ambient temperature inside the sealing seat, thereby obtaining the edge crush strength values ​​of the corrugated cardboard under different ambient temperatures, effectively improving the representativeness of the test results; furthermore, through the cooperation between the sealing seat, elastic airbag, inflation column, air pressure plate, linkage rod, and pressure plate, effective sealing of the inner cavity of the sealing seat is achieved before temperature change, improving the sealing effect, reducing energy consumption, and improving energy saving.

Description

Technical Field

[0001] This invention relates to the field of corrugated cardboard testing technology, and in particular to a corrugated cardboard strength testing device and testing method. Background Technology

[0002] Corrugated cardboard is a multi-layered structure made by bonding at least one layer of corrugated core paper and one or more layers of paper with starch-based adhesives. It features lightweight, high strength, good cushioning performance, low cost, and recyclability. After production, existing corrugated cardboard requires strength testing to ensure its quality meets standards. Edge crush strength is one of the various strength tests for corrugated cardboard. Edge crush strength is determined by placing a corrugated cardboard sample vertically under a pressure plate, applying pressure until the sample collapses. This test effectively assesses the vertical support strength of cartons produced from this corrugated cardboard.

[0003] Currently, corrugated cardboard boxes are used in various environments (high temperature, normal temperature, low temperature), thus requiring edge crush strength testing at different ambient temperatures. Existing conventional testing methods only operate at normal temperature, leading to insufficient representativeness of the data. While some testing devices can change the temperature, their sealing is often inadequate, causing energy leakage and wasted energy. Furthermore, the slow temperature change rate reduces testing efficiency. Therefore, this paper proposes a corrugated cardboard strength testing device and method. Summary of the Invention

[0004] The purpose of this invention is to address the problems of insufficient representativeness of test data in existing technologies, and the generally poor sealing performance and slow temperature change rate of testing devices with temperature control functions, which reduces testing efficiency. Therefore, this invention proposes a corrugated cardboard strength testing device and testing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A corrugated cardboard strength testing device includes a testing platform and a testing disk rotatably connected to the top of the testing platform, wherein the testing disk is provided with a clamping part for fixing the corrugated cardboard; guide rods symmetrically fixed on both sides of the top of the testing platform, and a sealing box is slidably sleeved between the two sets of guide rods, wherein a temperature control part for changing the temperature of the testing environment is provided inside the sealing box; wherein, a pressure part for pushing the sealing box to slide is provided at the top of the guide rods on both sides.

[0007] For convenient clamping and fixing, preferably, the clamping part includes a limiting rod, which is fixed to the inner wall of the detection disk. A limiting groove is formed on the top of the detection disk, and clamping plates are slidably connected to both sides of the limiting groove. An oblique slot is formed at the end of the clamping plate, and the bottom of the clamping plate is sleeved on the limiting rod. A first spring is sleeved on both sides of the limiting rod, and the two ends of the first spring are fixedly connected to the side wall of the limiting rod and the inner wall of the detection disk, respectively. A limiting ring is fixedly connected to the middle of the limiting rod.

[0008] To facilitate changes in the detection environment temperature, preferably, the temperature control unit includes a temperature-conducting pipe, which is fixed to the inner wall of the sealed box. A compressor is fixedly connected to the top of the sealed box, and the compressor is connected to the temperature-conducting pipe.

[0009] To facilitate sealing of the detection area, preferably, the top of the guide rods on both sides is fixedly connected to a mounting plate. The pressure part includes a hydraulic cylinder, which is fixed to the top of the mounting plate. The telescopic end of the hydraulic cylinder extends into the sealing box and is fixedly connected to a pressure plate. The side wall of the telescopic end of the hydraulic cylinder is slidably connected to the sealing box. A second spring is fixedly connected between the top two sides of the pressure plate and the top of the inner cavity of the sealing box. The pressure required for the second spring to deform is greater than the sliding friction between the sealing box and the guide rods on both sides.

[0010] To improve sealing performance, preferably, a sealing seat is fixedly connected to the testing platform, the bottom of the sealing box is aligned with the center of the groove of the sealing seat, and the inner diameter of the groove of the sealing seat is greater than the thickness of the side wall of the sealing box. Elastic airbags are fixedly connected to both sides of the inner wall of the sealing seat, and the two elastic airbags are connected to each other through an air guide groove. The sealing box is provided with an inflation part that drives the elastic airbags to wrap the bottom of the sealing box.

[0011] Furthermore, the inflation part includes an inflation column, which is fixed to the top of the sealed box. Two sets of inflation columns are symmetrically arranged along the center of the sealed box. Each set of inflation columns is slidably connected to a pressure plate. A linkage rod is fixedly connected to the bottom of the pressure plate. The bottom end of the linkage rod passes through the sealed box and through the center of the second spring before being fixedly connected to the top of the pressure plate. The side wall of the inflation column is fixed and connected to an air guide tube. The other end of the air guide tube passes through the side wall of the sealing seat and communicates with the inner cavity of the elastic airbag.

[0012] To improve testing efficiency, preferably, the bottom of the testing platform is provided with an equipment slot, and a drive motor is fixedly connected in the equipment slot. The output shaft of the drive motor is fixedly connected to the bottom of the testing plate.

[0013] Furthermore, a piston box is fixedly connected to the side wall of the sealing seat, a magnetic sliding plate is slidably connected inside the piston box, a third spring is fixedly connected between the magnetic sliding plate and the inner wall of the piston box, the piston box is connected to the bottom of the sealing seat groove through a plug pipe, a plug groove is opened at the bottom of the sealing box, a guide pipe is fixedly connected to the inner wall of the sealing box, the guide pipe communicates with the inner cavity of the plug groove, and a magnetic plate is fixedly connected to the side wall of the detection plate, the magnetic plate and the magnetic sliding plate are magnetically repelled, a suction pipe is fixedly connected to the top of the piston box, and a one-way valve is provided in both the suction pipe and the plug pipe.

[0014] Furthermore, the insertion slot, insertion tube, and guide tube are all arranged in four sets at equal intervals around the center of the detection disk. The insertion slot and insertion tube are aligned vertically, and the inner diameter of the insertion slot is equal to the outer diameter of the insertion tube. The output end of the guide tube is inclined downwards, and the extension line of the output end of the guide tube intersects the center of the detection disk.

[0015] A method for testing the strength of corrugated cardboard, comprising the following steps:

[0016] Step 1: Fix the cut corrugated cardboard test sample;

[0017] Step 2: Apply pressure to the corrugated cardboard and test its edge crush strength;

[0018] Step 3: Change the ambient temperature of the testing environment and repeat the test on the corrugated cardboard test samples of the same group.

[0019] Compared with the prior art, the present invention provides a corrugated cardboard strength testing device and testing method, which has the following beneficial effects:

[0020] 1. This corrugated cardboard strength testing device, through the setting of a compressor and a temperature-conducting pipe, achieves changes in the ambient temperature inside the sealing seat, thereby obtaining the edge crush strength values ​​of corrugated cardboard under different ambient temperatures, effectively improving the representativeness of the test results; and through the cooperation between the sealing seat, elastic airbag, inflation column, air pressure plate, linkage rod and pressure plate, effective sealing of the inner cavity of the sealing seat is achieved before temperature change, improving the sealing effect, reducing energy consumption, and improving energy saving effect.

[0021] 2. This corrugated cardboard strength testing device, through the rotation of the testing disc and the magnetic interaction between the magnetic plate and the magnetic sliding plate, generates an airflow at the top of the sealed box that blows towards the corrugated cardboard clamping area. This allows the heating or cooling energy generated by the temperature conducting tube to be absorbed by the airflow and quickly and concentratedly contact the corrugated cardboard, enabling it to reach a changing temperature state rapidly, thus effectively improving testing efficiency.

[0022] 3. The corrugated cardboard strength testing device, through the cooperation of the limiting rod, limiting slide, clamping plate and the first spring, facilitates the vertical clamping of corrugated cardboard, ensuring the stability of corrugated cardboard testing, and also improving the convenience of changing corrugated cardboard samples. Attached Figure Description

[0023] Figure 1 This is a front view schematic diagram of the overall structure of a corrugated cardboard strength testing device proposed in this invention;

[0024] Figure 2 This is a bottom view of the internal structure of the sealed box of the corrugated cardboard strength testing device proposed in this invention;

[0025] Figure 3 This is a top view schematic diagram of the detection disc structure of a corrugated cardboard strength testing device proposed in this invention;

[0026] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the detection disc of a corrugated cardboard strength testing device proposed in this invention;

[0027] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the sealed box of a corrugated cardboard strength testing device proposed in this invention;

[0028] Figure 6 This invention provides a corrugated cardboard strength testing device. Figure 5 Enlarged structural diagram of region A in the middle;

[0029] Figure 7 This is a schematic cross-sectional view of the sealing seat structure of a corrugated cardboard strength testing device proposed in this invention;

[0030] Figure 8 This invention provides a corrugated cardboard strength testing device. Figure 7 A magnified structural diagram of region B in the middle.

[0031] In the diagram: 1. Testing platform; 2. Testing disc; 21. Equipment slot; 22. Drive motor; 3. Guide rod; 31. Sealing box; 32. Mounting plate; 4. Limiting rod; 41. Limiting slide groove; 42. Clamping plate; 43. First spring; 44. Limiting ring; 5. Temperature guide pipe; 51. Compressor; 6. Hydraulic cylinder; 61. Pressure plate; 62. Second spring; 7. Sealing seat; 71. Elastic airbag; 711. Air guide groove; 72. Inflation column; 721. Air guide pipe; 73. Air pressure plate; 731. Linkage rod; 8. Piston box; 81. Magnetic sliding plate; 82. Third spring; 83. Insertion pipe; 831. Insertion groove; 832. Suction pipe; 84. Guide pipe; 85. Magnetic plate. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1:

[0035] Reference Figures 1-8 A corrugated cardboard strength testing device includes a testing platform 1, and further includes: a testing disk 2 rotatably connected to the top of the testing platform 1, the testing disk 2 being provided with a clamping part for fixing the corrugated cardboard; guide rods 3 symmetrically fixed on both sides of the top of the testing platform 1, a sealing box 31 being slidably sleeved between the two sets of guide rods 3, and a temperature control part for changing the temperature of the testing environment being provided inside the sealing box 31; wherein, pressure parts for pushing the sealing box 31 to slide are provided at the top of the guide rods 3 on both sides.

[0036] Reference Figure 3 , Figure 4 The clamping part includes a limiting rod 4, which is fixed on the inner wall of the detection plate 2. A limiting groove 41 is opened on the top of the detection plate 2. A clamping plate 42 is slidably connected to both sides of the limiting groove 41. An oblique groove is opened at the end of the clamping plate 42. The bottom of the clamping plate 42 is sleeved on the limiting rod 4. A first spring 43 is sleeved on both sides of the limiting rod 4. The two ends of the first spring 43 are fixedly connected to the side wall of the limiting rod 4 and the inner wall of the detection plate 2, respectively. A limiting ring 44 is fixedly connected to the middle of the limiting rod 4.

[0037] With the above structure, the clamping plate 42 is pushed open to both sides, thereby compressing the first spring 43. Then, the cut corrugated cardboard test sample is inserted between the two clamping plates 42. Then, the clamping plate 42 is released. Under the rebound action of the first spring 43, the two clamping plates 42 will clamp and fix the corrugated cardboard, so that the corrugated cardboard stands upright between the two clamping plates 42. This facilitates the vertical clamping of the corrugated cardboard and improves the convenience of testing.

[0038] Reference Figures 1-5The guide rods 3 on both sides are fixedly connected to the top of the mounting plate 32. The pressure part includes a hydraulic cylinder 6, which is connected to an existing pressure detection device. The pressure detection device records the pressure change of the hydraulic cylinder 6 during its downward press to obtain detection data. The hydraulic cylinder 6 is fixed to the top of the mounting plate 32. The telescopic end of the hydraulic cylinder 6 extends into the sealing box 31 and is fixedly connected to a pressure plate 61. The side wall of the telescopic end of the hydraulic cylinder 6 is slidably connected to the sealing box 31. Second springs 62 are fixedly connected between the top two sides of the pressure plate 61 and the top of the inner cavity of the sealing box 31. The pressure required for deformation is greater than the sliding friction between the sealing box 31 and the guide rods 3 on both sides; the temperature control unit includes a temperature conducting pipe 5, which is fixed on the inner wall of the sealing box 31, and a compressor 51 is fixedly connected to the top of the sealing box 31, and the compressor 51 is connected to the temperature conducting pipe 5; a sealing seat 7 is fixedly connected to the detection table 1, the bottom of the sealing box 31 is aligned with the center of the groove of the sealing seat 7, and the inner diameter of the groove of the sealing seat 7 is greater than the thickness of the side wall of the sealing box 31; an equipment slot 21 is opened at the bottom of the detection table 1, and a drive motor 22 is fixedly connected in the equipment slot 21, and the output shaft of the drive motor 22 is fixedly connected to the bottom of the detection plate 2.

[0039] With the above-described structure, the hydraulic cylinder 6 extends downwards, first allowing the sealing box 31 to be inserted into the sealing seat 7. Then, the hydraulic cylinder 6 continues to extend, thereby pulling the second spring 62, causing the pressure plate 61 to continue to move downwards. Under the rebound action of the second spring 62, the sealing box 31 will be pulled tightly into the sealing seat 7, ensuring the sealing effect. Then, the compressor 51 is started to heat or cool the temperature-conducting pipe 5, thereby changing the ambient temperature inside the sealing seat 7. Finally, the pressure plate 61 will squeeze the vertical corrugated cardboard, thereby obtaining the edge crush strength values ​​of the corrugated cardboard under different temperature conditions. By comparing and combining multiple sets of different temperature values, the representativeness of the test results is effectively improved.

[0040] Reference Figures 3-8The sealing seat 7 has elastic airbags 71 fixedly connected to both sides of its inner wall. The elastic airbags 71 on both sides are connected by air guide grooves 711. The sealing box 31 is provided with an inflation part that drives the elastic airbags 71 to wrap the bottom of the sealing box 31. The inflation part includes an inflation column 72, which is fixed to the top of the sealing box 31. Two sets of inflation columns 72 are symmetrically arranged along the center of the sealing box 31. Each set of inflation columns 72 is slidably connected to a pressure plate 73. The bottom of the pressure plate 73 is fixedly connected to a linkage rod 731, and the bottom end of the linkage rod 731 penetrates into the sealing box 31. After passing through the center of the second spring 62, it is fixedly connected to the top of the pressure plate 61. The side wall of the inflation column 72 is fixed and connected to the air guide pipe 721. The other end of the air guide pipe 721 passes through the side wall of the sealing seat 7 and connects to the inner cavity of the elastic airbag 71. The drive motor 22 is turned on to drive the detection plate 2 to rotate, so that the corrugated cardboard on the detection plate 2 comes into full contact with the temperature inside the sealing box 31, which effectively improves the temperature change efficiency. It can also drive the gas flow inside the sealing box 31, so that the heating or cooling effect quickly fills the entire sealing box 31, which speeds up the detection efficiency.

[0041] With the above-described structure, as the hydraulic cylinder 6 continues to move the pressure plate 61 downward, it will pull the linkage rod 731 to move the air pressure plate 73 downward as well. This will compress the gas in the inflation column 72 and cause this gas to enter the elastic airbag 71 along the air guide tube 721, thereby causing the elastic airbag 71 to expand and wrap around the bottom side wall of the sealing box 31. This effectively improves the sealing effect, ensures that the ambient temperature inside the sealing seat 7 does not dissipate outward, reduces energy consumption, and improves energy saving.

[0042] Reference Figure 5 , Figure 7 and Figure 8 In this system, a piston box 8 is fixedly connected to the side wall of the sealing seat 7, and a magnetic slide plate 81 is slidably connected inside the piston box 8. A third spring 82 is fixedly connected between the magnetic slide plate 81 and the inner wall of the piston box 8. The piston box 8 and the bottom of the groove in the sealing seat 7 are connected through a connector 83. A connector groove 831 is provided at the bottom of the sealing box 31, and a guide pipe 84 is fixedly connected to the inner wall of the sealing box 31. The guide pipe 84 communicates with the inner cavity of the connector groove 831. A magnetic plate 85 is fixedly connected to the side wall of the detection plate 2. The magnetic repulsion between the piston box 8 and the magnetic slide plate 81 is fixed at the top and connected to the suction pipe 832. Both the suction pipe 832 and the insertion pipe 83 are equipped with one-way valves. The insertion slot 831, the insertion pipe 83 and the guide pipe 84 are all distributed in four sets at equal intervals around the center of the detection disk 2. The insertion slot 831 and the insertion pipe 83 are aligned vertically, and the inner diameter of the insertion slot 831 is equal to the outer diameter of the insertion pipe 83. The output end of the guide pipe 84 is inclined downward, and the extension line of the output end of the guide pipe 84 intersects the center of the detection disk 2.

[0043] It should be noted that the one-way valve in the insertion pipe 83 can only allow airflow from the piston box 8 to enter the sealing box 31; the one-way valve in the extraction pipe 832 can only allow airflow from the sealing box 31 to enter the piston box 8.

[0044] With the above-described structure, as the detection disc 2 rotates, the repulsive force between the magnetic plate 85 and the magnetic slide plate 81 causes the magnetic slide plate 81 to retract into the piston box 8, thereby compressing the gas inside the piston box 8 and opening the one-way valve in the insertion pipe 83. This allows the compressed gas to flow through the insertion pipe 83 and the insertion slot 831, and then be ejected from the output end of the guide pipe 84. This generates an airflow at the top of the sealed box 31 that blows towards the corrugated cardboard clamping area, causing the heating or cooling energy generated by the temperature-conducting pipe 5 to be absorbed by the airflow and quickly and efficiently dissipated. The magnetic plate 85 contacts the corrugated cardboard so that it can quickly reach a changing temperature. Then, when the magnetic plate 85 and the magnetic slide plate 81 separate from the repulsive area, the magnetic slide plate 81 will return to its original position under the rebound action of the third spring 82, and generate a suction force in the piston box 8. This causes the one-way valve in the air extraction pipe 832 to open, allowing the airflow at the bottom of the sealed box 31 to enter the piston box 8. In this way, by blowing upwards and sucking downwards, the airflow in the sealed box 31 is directed to quickly deliver the temperature generated by the temperature conducting pipe 5 to the corrugated cardboard, effectively improving the detection efficiency.

[0045] Reference Figures 1-8 In this invention, when in use, the clamping plates 42 are pushed open to both sides to compress the first spring 43. Then, the cut corrugated cardboard test sample is inserted between the two clamping plates 42. Then, the clamping plates 42 are released. Under the rebound action of the first spring 43, the two clamping plates 42 will clamp and fix the corrugated cardboard, so that the corrugated cardboard stands vertically between the two clamping plates 42 to ensure its stability, so as to test its edge crush strength.

[0046] Hydraulic cylinder 6 extends downwards, first inserting the sealing box 31 into the sealing seat 7. Then, hydraulic cylinder 6 continues to extend, pulling the second spring 62, causing the pressure plate 61 to continue moving downwards, thus compressing the vertical corrugated cardboard to obtain the edge crush strength value of the corrugated cardboard at room temperature. Subsequently, a new corrugated cardboard test sample is replaced. When the sealing box 31 is inserted into the sealing seat 7, the insertion slot 831 and the insertion tube 83 will align and connect, and the pressure plate 61 continues to pull the second spring 62 downwards. Under the rebound action of the second spring 62, the sealing box 31 will be pulled tightly into the sealing seat 7, ensuring the sealing effect. Then, compressor 51 is turned on. The heating or cooling of the temperature-conducting pipe 5 changes the ambient temperature inside the sealing seat 7. As the hydraulic cylinder 6 continues to move the pressure plate 61 downwards, it pulls the linkage rod 731, causing the air pressure plate 73 to move downwards as well. This compresses the gas inside the inflation column 72, allowing it to enter the elastic air bladder 71 along the air guide pipe 721. This causes the elastic air bladder 71 to inflate, thus wrapping the bottom sidewall of the sealing box 31, effectively improving the sealing effect and ensuring that the ambient temperature inside the sealing seat 7 does not dissipate outwards, reducing energy consumption and improving energy efficiency. After the sealing box 31 is inserted to the bottom of the groove in the sealing seat 7, the drive motor 22 is simultaneously turned on. This causes the detection disc 2 to rotate, ensuring full contact between the corrugated cardboard on the detection disc 2 and the temperature inside the sealed box 31, effectively improving the temperature change efficiency. It also drives the gas flow within the sealed box 31, allowing the heating or cooling effect to quickly fill the entire sealed box 31, accelerating the detection efficiency. Furthermore, as the detection disc 2 rotates, the repulsive action between the magnetic plate 85 and the magnetic slide plate 81 causes the magnetic slide plate 81 to retract into the piston box 8, compressing the gas inside the piston box 8. This opens the one-way valve in the insertion pipe 83, allowing the compressed gas to flow through the insertion pipe 83 and the insertion slot 831, before being ejected from the output end of the guide pipe 84, thus igniting the gas inside the sealed box 31. The top of 1 generates an airflow that blows towards the corrugated cardboard clamping area. This airflow absorbs the heating or cooling energy generated by the temperature-conducting tube 5 and quickly and concentratedly contacts the corrugated cardboard, allowing it to rapidly reach a changing temperature. Subsequently, when the magnetic plate 85 and the magnetic slide plate 81 separate from the repulsive area, the magnetic slide plate 81 will return to its original position under the rebound action of the third spring 82, generating a suction force in the piston box 8. This causes the one-way valve in the suction pipe 832 to open, allowing the airflow at the bottom of the sealing box 31 to enter the piston box 8. Through this upward blowing and downward suction, the airflow in the sealing box 31 is directed to quickly deliver the temperature generated by the temperature-conducting tube 5 to the corrugated cardboard, effectively improving the detection efficiency.

[0047] Example 2:

[0048] Reference Figures 1-8Similar to Example 1, but based on Example 1, a method for testing the strength of corrugated cardboard is proposed, with the following steps:

[0049] Step 1: Fix the cut corrugated cardboard test sample: Push the clamping plate 42 to both sides to compress the first spring 43. Then insert the cut corrugated cardboard test sample between the two clamping plates 42. Then release the clamping plate 42. Under the rebound action of the first spring 43, the two clamping plates 42 will clamp and fix the corrugated cardboard, so that the corrugated cardboard stands vertically between the two clamping plates 42.

[0050] Step 2: Apply pressure to the corrugated cardboard and test its edge crush strength: The hydraulic cylinder 6 extends downward, first allowing the sealing box 31 to be inserted into the sealing seat 7, and then the hydraulic cylinder 6 continues to extend, thereby pulling the second spring 62, causing the pressure plate 61 to continue to move downward, thereby squeezing the vertical corrugated cardboard, and thus obtaining the edge crush strength value of the corrugated cardboard under normal temperature conditions.

[0051] Step 3: Change the ambient temperature and repeat the test on the same group of corrugated cardboard samples: After inserting the sealing box 31 into the sealing seat 7, turn on the compressor 51 to heat or cool the temperature guide tube 5, thereby changing the ambient temperature inside the sealing seat 7. As the hydraulic cylinder 6 continues to move the pressure plate 61 downwards, it will pull the linkage rod 731, causing the air pressure plate 73 to move downwards as well. This will compress the gas in the inflation column 72, allowing this gas to enter the elastic air bladder 71 along the air guide tube 721, causing the elastic air bladder 71 to inflate. This wraps around the bottom side wall of the sealing box 31, effectively improving the sealing effect and ensuring that the ambient temperature inside the sealing seat 7 does not dissipate outwards, reducing energy consumption and improving energy efficiency. Next, turn on the drive motor 22 to rotate the detection disc 2, thereby causing the detection disc 2... The corrugated cardboard on the plate makes full contact with the temperature inside the sealed box 31, effectively improving the temperature change efficiency. It also drives the gas flow inside the sealed box 31, allowing the heating or cooling effect to quickly fill the entire sealed box 31, thus accelerating the detection efficiency. Furthermore, as the detection plate 2 rotates, the repulsive action between the magnetic plate 85 and the magnetic sliding plate 81 causes the magnetic sliding plate 81 to retract into the piston box 8, thereby compressing the gas inside the piston box 8 and opening the one-way valve in the insertion pipe 83. This compressed gas flows through the insertion pipe 83 and the insertion slot 831 and is ejected from the output end of the guide pipe 84. This generates an airflow at the top of the sealed box 31 that blows towards the corrugated cardboard clamping area. The heating or cooling energy generated by the temperature conducting pipe 5 is absorbed by the airflow and quickly and concentratedly contacts the corrugated cardboard, allowing it to quickly reach the temperature change state, effectively improving the detection efficiency.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A corrugated cardboard strength testing device, comprising a testing table (1), characterized in that, Also includes: The detection plate (2) is rotatably connected to the top of the detection table (1), and the detection plate (2) is provided with a clamping part for fixing the corrugated cardboard; Guide rods (3) are symmetrically fixed on both sides of the top of the testing platform (1). A sealing box (31) is slidably sleeved between the two sets of guide rods (3). A temperature control unit for changing the temperature of the testing environment is provided inside the sealing box (31). Among them, the top of the guide rods (3) on both sides is provided with a pressure part that pushes the sealing box (31) to slide; A sealing seat (7) is fixedly connected to the testing platform (1). The bottom of the sealing box (31) is aligned with the center of the groove of the sealing seat (7). The inner diameter of the groove of the sealing seat (7) is greater than the thickness of the side wall of the sealing box (31). Elastic airbags (71) are fixedly connected to both sides of the inner wall of the sealing seat (7). The elastic airbags (71) on both sides are connected by an air guide groove (711). An inflation part is provided on the sealing box (31) to drive the elastic airbags (71) to wrap the bottom of the sealing box (31). The inflation part includes an inflation column (72), which is fixed to the top of the sealed box (31). Two sets of inflation columns (72) are symmetrically arranged along the center of the sealed box (31). Each set of inflation columns (72) is slidably connected to a pressure plate (73). A linkage rod (731) is fixedly connected to the bottom of the pressure plate (73). The bottom end of the linkage rod (731) passes through the sealed box (31) and through the center of the second spring (62) before being fixedly connected to the top of the pressure plate (61). The side wall of the inflation column (72) is fixed and connected to an air guide tube (721). The other end of the air guide tube (721) passes through the side wall of the sealing seat (7) and communicates with the inner cavity of the elastic airbag (71).

2. The corrugated cardboard strength testing device according to claim 1, characterized in that, The clamping part includes a limiting rod (4), which is fixed on the inner wall of the detection disk (2). A limiting groove (41) is opened on the top of the detection disk (2). A clamping plate (42) is slidably connected to both sides of the limiting groove (41). An oblique slot is opened at the end of the clamping plate (42). The bottom of the clamping plate (42) is sleeved on the limiting rod (4). A first spring (43) is sleeved on both sides of the limiting rod (4). The two ends of the first spring (43) are fixedly connected to the side wall of the limiting rod (4) and the inner wall of the detection disk (2), respectively. A limiting ring (44) is fixedly connected to the middle part of the limiting rod (4).

3. The corrugated cardboard strength testing device according to claim 1, characterized in that, The temperature control unit includes a temperature guide tube (5), which is fixed on the inner wall of the sealed box (31). A compressor (51) is fixedly connected to the top of the sealed box (31), and the compressor (51) is connected to the temperature guide tube (5).

4. The corrugated cardboard strength testing device according to claim 1, characterized in that, The top of the guide rods (3) on both sides is fixedly connected to the mounting plate (32). The pressure part includes a hydraulic cylinder (6). The hydraulic cylinder (6) is fixed on the top of the mounting plate (32). The telescopic end of the hydraulic cylinder (6) passes through the sealing box (31) and is fixedly connected to the pressure plate (61). The side wall of the telescopic end of the hydraulic cylinder (6) is slidably connected to the sealing box (31). The top two sides of the pressure plate (61) are fixedly connected to the top of the inner cavity of the sealing box (31). The pressure required for the second spring (62) to deform is greater than the sliding friction force generated between the sealing box (31) and the guide rods (3) on both sides.

5. The corrugated cardboard strength testing device according to claim 1, characterized in that, The bottom of the testing platform (1) is provided with an equipment slot (21), and a drive motor (22) is fixedly connected in the equipment slot (21). The output shaft of the drive motor (22) is fixedly connected to the bottom of the testing disk (2).

6. The corrugated cardboard strength testing device according to claim 5, characterized in that, A piston box (8) is fixedly connected to the side wall of the sealing seat (7). A magnetic slide plate (81) is slidably connected inside the piston box (8). A third spring (82) is fixedly connected between the magnetic slide plate (81) and the inner wall of the piston box (8). The piston box (8) and the bottom of the groove of the sealing seat (7) are connected through a plug pipe (83). A plug groove (831) is opened at the bottom of the sealing box (31). A guide pipe (84) is fixedly connected to the inner wall of the sealing box (31). The guide pipe (84) is connected to the inner cavity of the plug groove (831). A magnetic plate (85) is fixedly connected to the side wall of the detection plate (2). The magnetic plate (85) and the magnetic slide plate (81) are magnetically repelled. A suction pipe (832) is fixedly connected to the top of the piston box (8). A one-way valve is provided in both the suction pipe (832) and the plug pipe (83).

7. The corrugated cardboard strength testing device according to claim 6, characterized in that, The insertion slot (831), insertion tube (83), and guide tube (84) are all arranged in four sets at equal intervals around the center of the detection disk (2). The insertion slot (831) and insertion tube (83) are aligned vertically, and the inner diameter of the insertion slot (831) is equal to the outer diameter of the insertion tube (83). The output end of the guide tube (84) is inclined downward, and the extension line of the output end of the guide tube (84) intersects the center of the detection disk (2).

8. A method for testing the strength of corrugated cardboard, using a corrugated cardboard strength testing device as described in any one of claims 1-7, characterized in that, The steps are as follows: Step 1: Fix the cut corrugated cardboard test sample; Step 2: Apply pressure to the corrugated cardboard and test its edge crush strength; Step 3: Change the ambient temperature of the testing environment and repeat the test on the corrugated cardboard test samples of the same group.

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