A device for testing the compressive strength of kraft paper production

Abstract

This invention relates to the field of paper testing, and more particularly to a compressive strength testing device for kraft paper production. The device includes a testing platform with top frames fixed to both sides of its upper end. Support rods are fixed between the upper end of the testing platform and the top frames. A set of flattening rollers is rotatably mounted on the upper end of the top frames. Kraft paper passes through the gaps between the flattening rollers. A set of clamping plates is provided at both the upper and lower ends inside the top frames. The clamping plates are installed in clamping brackets at both ends, with the upper clamping bracket fixed to the top frame and the lower clamping bracket slidably mounted on the support rods at both ends. A pressure-applying component is provided on one side of the top frame, and a testing component is provided below the testing platform. This invention utilizes a single testing device to simultaneously perform tensile and compressive strength tests on kraft paper, achieving high testing accuracy and good testing results. Furthermore, it effectively prevents the clamping plates from loosening during testing, thereby greatly improving the clamping stability of the kraft paper and preventing it from loosening and detaching.

Description

Technical Field

[0001] This invention relates to the field of paper testing technology, and in particular to a device for testing the compressive strength of kraft paper production. Background Technology

[0002] Kraft paper is a high-strength packaging material made from sulfate softwood pulp. Named for its tough texture and yellowish-brown color, it is widely used in industrial packaging, food wrapping, and creative handicrafts. Its core characteristics lie in its excellent burst strength, tensile strength, and water resistance, enabling it to withstand the mechanical stresses during transportation and handling. Therefore, quality testing of its compressive strength is an indispensable and crucial step in ensuring its physical properties and application safety during kraft paper production.

[0003] Chinese patent application CN2023213181796 discloses a device for testing the compressive strength of kraft paper, comprising: a worktable for testing the compressive strength of kraft paper; an adjustment assembly including a longitudinal adjustment mechanism and a transverse adjustment mechanism; a clamping assembly including several clamping arms; and a pressure application assembly including a power component located above the worktable and a detection probe driven vertically by the power component. This device replaces manual flattening of kraft paper, offering convenient and quick operation. However, it can only perform vertical compressive strength tests on kraft paper, while kraft paper is frequently subjected to tensile loads during use. Therefore, this device cannot perform comprehensive and effective tensile strength testing on kraft paper. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the compressive strength of kraft paper in production, thereby solving the aforementioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A compressive strength testing device for kraft paper production includes a testing platform. Top frames are fixed to both sides of the upper end of the testing platform. Support rods are fixed between the upper end of the testing platform and the top frames. A set of flattening rollers is rotatably mounted on the upper end of the top frames. Kraft paper passes through the gaps between the flattening rollers. A set of clamping plates is provided at both the upper and lower ends inside the top frames. The clamping plates are installed in clamping brackets at both ends. The upper clamping bracket is fixedly connected to the top frame, and the lower clamping bracket is slidably mounted on the support rods at both ends. A pressure application component is provided on one side of the top frame. A testing component is provided below the testing platform. The testing component includes a positioning rod. A positioning plate is fixed to the bottom end of the positioning rod. The top end of the positioning rod is connected to the bottom of a tension gauge. The bottom ends of the lower clamping bracket are connected to the top of the tension gauge via steel wire ropes. A pressure plate is axially slidably mounted on the positioning rod. When the pressure plate pushes down on the positioning plate, a tensile test is performed on the kraft paper. When the pressure plate blocks and limits the positioning plate, the pressure application component applies vertical pressure to the kraft paper to perform a compressive strength test.

[0007] As a further embodiment of the present invention: a test host is fixedly provided at the upper end of the test platform, the tension gauge is communicatively connected to the test host, and a clearance groove is provided through the center of the test platform for the steel wire rope and the tension gauge to pass through.

[0008] As a further embodiment of the present invention: a first connecting rod is rotatably mounted on both ends of the clamping plate, wherein the end of the first connecting rod at one end is rotatably engaged with a threaded sleeve, and the end of the first connecting rod at the other end is rotatably engaged with a sliding sleeve, and a locking bolt is rotatably mounted on the upper end of the sliding sleeve.

[0009] As a further embodiment of the present invention: the clamping brackets are symmetrically arranged at both ends of the clamping plate, and a sliding rod is fixedly provided inside the clamping brackets. The two ends of the clamping plate are slidably installed on the corresponding sliding rods. A clamping screw is rotatably installed on the side wall of the clamping bracket at one end, and the screw sleeve is threadedly installed on the clamping screw. A limiting plate is fixedly provided on the side wall of the clamping bracket at the other end, and the sliding sleeve is slidably installed on the limiting plate.

[0010] As a further aspect of the present invention: the inner wall of each set of clamps is fixedly provided with interlocking serrated rubber layers.

[0011] As a further embodiment of the present invention: the detection assembly further includes a bidirectional screw and a light rod arranged in parallel. The two ends of the bidirectional screw are rotatably engaged with the detection table. A hand crank is fixedly connected to one end of the bidirectional screw. The two ends of the light rod are fixedly connected to the detection table. A pair of movable plates are symmetrically threaded at both ends of the bidirectional screw. The movable plates are slidably mounted on the light rod. The bottom of the movable plates is rotatably engaged with one end of a second connecting rod. The other end of the second connecting rod is rotatably engaged with a pressure plate.

[0012] As a further embodiment of the present invention: the pressure application component includes a mounting plate, an electric slide rail is provided on the side wall of the top frame, slide seats that slide in cooperation with the electric slide rail are fixed at both ends of the mounting plate, a transverse sliding screw driven by a servo motor is rotatably mounted on the mounting plate, a transverse sliding support is threaded through the transverse sliding screw, a cylinder fixing plate is fixedly connected to one end of the transverse sliding support, a push cylinder is fixedly provided on the cylinder fixing plate, and a pressure head is provided at the output end of the push cylinder.

[0013] As a further embodiment of the present invention: the two ends of the flattening roller are rotatably mounted on the rotating support, the two ends of the flattening roller are provided with sliding frames, the sliding frames are fixed to the upper end of the top frame, the rotating support is symmetrically slidably mounted on the two ends of the sliding frame, and a top spring is provided between the rotating support and the sliding frame.

[0014] The beneficial effects of this invention are:

[0015] (1) By setting up two sets of clamping plates, during the test, the kraft paper is squeezed by the flattening roller to eliminate surface wrinkles. Then, the upper and lower ends of the kraft paper are clamped by the two sets of clamping plates respectively. The kraft paper can be vertically stretched and flattened. When the tensile test is performed, the pressure plate is used to push the positioning plate downward. When the compressive test is performed, the pressure plate is attached to the top of the positioning plate and remains fixed to apply axial movement constraint to the positioning plate. The pressure component is used to apply vertical pressure to the kraft paper. Thus, a set of testing equipment can simultaneously achieve tensile and compressive tests on kraft paper. The test accuracy is high and the test effect is good.

[0016] (2) By setting up a clamping bracket, when the kraft paper passes through the clamping plates, the clamping screw is rotated to drive the screw sleeve to move linearly. The screw sleeve will drive the two clamping plates to move closer to each other through the first connecting rod until they contact and squeeze the kraft paper, thereby clamping the kraft paper. At the same time, the first connecting rod at the other end of the clamping plate will push the sliding sleeve to slide along the limiting plate. When the clamping is in place, the locking bolt is rotated to fix the position of the sliding sleeve. Combined with the good self-locking performance of the threaded fit, it can effectively prevent the clamping plates from loosening during the test, thereby greatly improving the clamping stability of the kraft paper and preventing it from loosening and falling off. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

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

[0019] Figure 2 This is a schematic diagram of the rear structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the clamping plate in this invention.

[0021] Figure 4 This is a schematic diagram of the clamping bracket in this invention.

[0022] Figure 5 This is a schematic diagram of the detection component in this invention.

[0023] Figure 6 This is a schematic diagram of the pressure application component in this invention.

[0024] Figure 7 This is a schematic diagram of the structure of the flattening roller in this invention.

[0025] In the picture:

[0026] 1. Testing table; 101. Support rod; 102. Clearance groove;

[0027] 2. Top frame; 201. Electric slide rail;

[0028] 3. Flattening roller; 301. Rotating support; 302. Sliding frame; 303. Top spring;

[0029] 4. Test the host computer;

[0030] 5. Clamping plate; 501. First connecting rod; 502. Screw sleeve; 503. Sliding sleeve; 504. Locking bolt; 505. Serrated rubber layer;

[0031] 6. Clamping bracket; 601. Slide rod; 602. Clamping screw; 603. Limiting plate;

[0032] 7. Pressure application assembly; 701. Mounting plate; 702. Slide; 703. Transverse screw; 704. Servo motor; 705. Transverse support; 706. Cylinder mounting plate; 707. Push cylinder; 708. Pressure head;

[0033] 8. Detection components; 801. Bidirectional screw; 802. Hand crank; 803. Smooth rod; 804. Movable plate; 805. Second connecting rod; 806. Pressure plate; 807. Positioning rod; 808. Positioning plate; 809. Tension gauge; 810. Steel wire rope. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-5As shown, this invention is a compressive strength testing device for kraft paper production, comprising a testing platform 1, top frames 2 fixedly mounted on both sides of the upper end of the testing platform 1, and support rods 101 fixedly mounted between the upper end of the testing platform 1 and the top frames 2. A set of flattening rollers 3 are rotatably mounted on the upper end of the top frames 2, and the kraft paper passes through the gaps between the flattening rollers 3. A set of clamping plates 5 are provided at both the upper and lower ends inside the top frames 2, and the two ends of the clamping plates 5 are installed in clamping brackets 6. The upper clamping bracket 6 is fixedly connected to the top frames 2, and the lower clamping bracket 6 is slidably installed through the support rods 101 at both ends. A pressure application device is provided on one side of the top frames 2. Component 7, a testing component 8 is provided below the testing platform 1. The testing component 8 includes a positioning rod 807, a positioning plate 808 is fixedly provided at the bottom end of the positioning rod 807, the top end of the positioning rod 807 is connected to the bottom of the tension gauge 809, and the bottom ends of the clamping bracket 6 below are connected to the top of the tension gauge 809 through steel wire ropes 810. A pressure plate 806 is axially slidably installed on the positioning rod 807. When the pressure plate 806 pushes the positioning plate 808 downward, it performs a tensile test on the kraft paper. When the pressure plate 806 blocks and limits the positioning plate 808, the pressure application component 7 applies vertical pressure to the kraft paper to perform a compression test.

[0036] Specifically, by setting up two sets of clamping plates 5, during the test, the kraft paper is squeezed by the flattening roller 3 to eliminate surface wrinkles. Then, the upper and lower ends of the kraft paper are clamped by the two sets of clamping plates 5 respectively. Since the clamping bracket 6 below can slide freely axially, the kraft paper can be vertically tensioned and flattened under its own gravity.

[0037] When conducting a tensile test, the pressure plate 806 pushes the positioning plate 808 downward. At this time, the pulling force of the positioning rod 807 on the tension gauge 809 can be transmitted to the clamping plate 5 through the wire rope 810 and the clamping bracket 6, so that the kraft paper can be subjected to a uniform tensile force. The tension gauge 809 can effectively detect the maximum tensile force that the kraft paper is subjected to at the moment of breakage, thereby judging the compressive strength of the kraft paper.

[0038] During the compression test, the pressure plate 806 is fixed against the positioning plate 808 to apply axial movement constraint to the positioning plate 808, and the pressure application component 7 applies vertical pressure to the kraft paper. At this time, the kraft paper will deform and pull the clamping bracket 6 below to make corresponding displacement. The maximum tensile force on the kraft paper at the moment of breakage can be effectively monitored by the tensile gauge 809, so as to judge the compression performance of the kraft paper.

[0039] like Figures 1-5 As shown, a test host 4 is fixedly installed on the upper end of the test platform 1, and the tension gauge 809 is connected to the test host 4. A clearance groove 102 is provided through the center of the test platform 1 for the steel wire rope 810 and the tension gauge 809 to pass through.

[0040] Specifically, after the kraft paper is stretched and flattened, the tensile tester 809 needs to be zeroed before the tensile or compressive strength test. During the test, the test host 4 receives the tensile signal from the tensile tester 809 and displays it digitally, so as to intuitively and accurately display the change of tensile value during the test and thus provide feedback on the tensile or compressive strength of the kraft paper.

[0041] like Figure 4 and Figure 5 As shown, a first connecting rod 501 is rotatably installed at both ends of the clamping plate 5. The end of the first connecting rod 501 at one end is rotatably engaged with the threaded sleeve 502, and the end of the first connecting rod 501 at the other end is rotatably engaged with the sliding sleeve 503. A locking bolt 504 is rotatably installed on the upper end of the sliding sleeve 503.

[0042] Furthermore, clamping brackets 6 are symmetrically arranged at both ends of clamping plate 5. A sliding rod 601 is fixed inside the clamping bracket 6. Both ends of clamping plate 5 are slidably installed on the corresponding sliding rod 601. A clamping screw 602 is rotatably installed on the side wall of one end of the clamping bracket 6, and a threaded sleeve 502 is threaded onto the clamping screw 602. A limiting plate 603 is fixed on the side wall of the other end of the clamping bracket 6, and the sliding sleeve 503 is slidably installed on the limiting plate 603.

[0043] Specifically, by setting up the clamping bracket 6, when the kraft paper passes between the clamping plates 5, the clamping screw 602 is rotated, causing the screw sleeve 502 to move linearly. The screw sleeve 502 will drive the two clamping plates 5 to move closer to each other through the first connecting rod 501 until they contact and squeeze the kraft paper, thereby clamping the kraft paper. At the same time, the first connecting rod 501 at the other end of the clamping plate 5 will push the sliding sleeve 503 to slide along the limiting plate 603. When the clamping is in place, the locking bolt 504 is rotated to fix the position of the sliding sleeve 503. Combined with the good self-locking performance of the threaded engagement, it can effectively prevent the clamping plates 5 from loosening during the test, thereby greatly improving the clamping stability of the kraft paper and preventing it from loosening and falling off.

[0044] In this embodiment, a friction groove is provided on the surface of the limiting plate 603, which provides strong friction for the locking bolt 504 to prevent it from shifting. Alternatively, screw holes that cooperate with the locking bolt 504 can be arranged on the surface of the limiting plate 603, which can also ensure that the position of the sliding sleeve 503 remains fixed.

[0045] like Figure 3 As shown, each set of clamps 5 has interlocking serrated rubber layers 505 fixed on its inner wall.

[0046] Specifically, the serrated structure effectively increases the contact area with the kraft paper, thereby increasing friction to prevent slippage. At the same time, it can absorb some of the clamping stress by utilizing the elastic deformation of the rubber. The sharp ends of each serration are rounded to avoid directly cutting the kraft paper.

[0047] like Figure 5 As shown, the detection assembly 8 also includes a bidirectional screw 801 and a smooth rod 803 arranged in parallel. The two ends of the bidirectional screw 801 are rotatably engaged with the detection table 1. A hand crank 802 is fixedly connected to one end of the bidirectional screw 801. The two ends of the smooth rod 803 are fixedly connected to the detection table 1. A pair of movable plates 804 are symmetrically threaded at both ends of the bidirectional screw 801. The movable plates 804 are slidably installed on the smooth rod 803. The bottom of the movable plates 804 is rotatably engaged with one end of the second connecting rod 805. The other end of the second connecting rod 805 is rotatably engaged with the pressure plate 806.

[0048] Specifically, by setting up the detection component 8, during the tensile test, the hand crank 802 rotates the bidirectional screw 801, driving the movable plates 804 at both ends to move closer to each other along the smooth rod 803. At this time, the movable plates 804 will drive the pressure plate 806 to descend smoothly along the positioning rod 807 through the second connecting rod 805 until it contacts the positioning plate 808 and begins to push downwards. A uniform downward pulling force is applied to the kraft paper through the steel wire rope 810 and the clamping bracket 6 below. During the compression test, the pressure plate 806 is controlled to abut against the upper end of the positioning plate 808. At this time, the hand crank 802 is locked and stationary, and the pressure plate 806 will also be fixed, thereby axially constraining the limiting plate 603. When the pressure application component 7 applies vertical pressure to the kraft paper, since the positioning rod 807 and the positioning plate 808 remain stationary, the clamping bracket 6, which moves upwards synchronously with the deformation of the kraft paper, will apply an upward pulling force to the tensile testing machine through the steel wire rope 810.

[0049] like Figure 2 , Figure 5 and Figure 6 As shown, the pressure application component 7 includes a mounting plate 701, an electric slide rail 201 is provided on the side wall of the top frame 2, and slide seats 702 that slide and cooperate with the electric slide rail 201 are fixed at both ends of the mounting plate 701. A transverse screw 703 driven to rotate by a servo motor 704 is rotatably mounted on the mounting plate 701. A transverse support 705 is threaded through the transverse screw 703. A cylinder fixing plate 706 is fixedly connected to one end of the transverse support 705. A push cylinder 707 is fixedly mounted on the cylinder fixing plate 706. A pressure head 708 is provided at the output end of the push cylinder 707.

[0050] Specifically, when conducting a compression test on kraft paper, the kraft paper is kept taut and flat. The mounting plate 701 moves up and down along the electric slide rail 201 to adjust the height of the pressure head 708. At the same time, the transverse screw 703 drives the transverse support 705 to move laterally to adjust the horizontal position of the pressure head 708. After the pressure position of the pressure head 708 on the kraft paper is determined, the push cylinder 707 pushes the pressure head 708 to press vertically against the kraft paper. The kraft paper gradually begins to deform under pressure. The clamping bracket 6 below moves upward and applies tension to the tension gauge 809 through the wire rope 810. When the kraft paper is subjected to vertical pressure to the limit and breaks, the tension gauge 809 detects the maximum tension that the kraft paper receives at the moment of breakage in real time to determine the compression resistance of the kraft paper.

[0051] It should be noted that the pressure head 708 in this embodiment adopts a spherical structure, which has a large contact area with the kraft paper. However, in actual use, kraft paper often encounters impacts from sharp objects, in which case the contact area between the pressure head 708 and the kraft paper is very small. To simulate a more realistic usage scenario, the pressure head 708 is detachable, allowing the sharp-structured pressure head 708 to be disassembled and replaced to test the puncture strength of the kraft paper, thereby enabling a more comprehensive test of the kraft paper's compressive strength.

[0052] like Figure 7 As shown, the flattening roller 3 is rotatably mounted on the rotating support 301 at both ends. The flattening roller 3 is provided with a sliding frame 302 at both ends. The sliding frame 302 is fixed to the upper end of the top frame 2. The rotating support 301 is symmetrically slidably mounted on both ends of the sliding frame 302. A top spring 303 is provided between the rotating support 301 and the sliding frame 302.

[0053] Specifically, by setting the flattening roller 3, the rotating supports 301 at both ends always tend to approach each other under the elastic force of the top spring 303. This allows the flattening rollers 3 at both ends to press tightly together. When the kraft paper passes through the gap between the two rollers, the strong squeezing action between the flattening rollers 3 can effectively flatten and eliminate the wrinkles on the surface of the kraft paper, keeping the kraft paper flat, which is beneficial to the inspection process.

[0054] The working principle of this invention is as follows: Figures 1-7As shown, during use, the kraft paper is first passed through the gap between the flattening rollers 3. The strong squeezing action of the flattening rollers 3 effectively flattens and eliminates wrinkles on the surface of the kraft paper. Then, the upper and lower clamping plates 5 clamp the upper and lower ends of the kraft paper respectively. Since the clamping bracket 6 below can slide freely axially, the kraft paper can be vertically tensioned and flattened under its own weight. When clamping the kraft paper, by rotating the clamping screw 602, the screw sleeve 502 is driven to move linearly. The screw sleeve 502 will drive the two clamping plates 5 to move closer to each other until they contact and squeeze the kraft paper, thereby clamping the kraft paper. At the same time, the first connecting rod 501 at the other end of the clamping plate 5 will push the sliding sleeve 503 to slide along the limiting plate 603. When the clamping is in place, the locking bolt 504 is rotated to fix the position of the sliding sleeve 503. Combined with the good self-locking performance of the threaded engagement, it can effectively prevent the clamping plates 5 from loosening during the test. During the tensile test, the double-ended screw 801 is rotated by the hand crank 802, driving the movable plates 804 at both ends to move closer to each other along the smooth rod 803. At this time, the movable plates 804 will drive the pressure plate 806 to descend smoothly along the positioning rod 807 via the second connecting rod 805 until it contacts the positioning plate 808 and begins to push downwards. A uniform downward pulling force is applied to the kraft paper through the wire rope 810 and the clamping bracket 6 below. The maximum tensile force on the kraft paper at the moment of breakage is effectively detected by the tensile gauge 809, thereby judging the compressive strength of the kraft paper. During the compression test, the pressure plate 806 is fixed against the positioning plate 808 to apply axial movement constraint to the positioning plate 808. The pressure application component 7 is used to apply vertical pressure to the kraft paper. At this time, the kraft paper will deform and pull the clamping bracket 6 below to cause corresponding displacement. The tensile gauge 809 can effectively monitor the maximum tensile force on the kraft paper at the moment of breakage, thereby judging the compressive strength of the kraft paper.

[0055] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A device for testing the compressive strength of kraft paper, comprising a testing platform (1), wherein top frames (2) are fixedly mounted on both sides of the upper end of the testing platform (1), characterized in that, A support rod (101) is fixed between the upper end of the testing platform (1) and the top frame (2). A set of flattening rollers (3) are rotatably installed on the upper end of the top frame (2). Kraft paper passes through the gap between the flattening rollers (3). A set of clamping plates (5) are provided at both the upper and lower ends inside the top frame (2). The clamping plates (5) are installed in clamping brackets (6) at both ends. The upper clamping bracket (6) is fixed to the top frame (2), and the lower clamping bracket (6) is slidably installed on the support rods (101) at both ends. A pressure component (7) is provided on one side of the top frame (2), and a testing component (8) is provided below the testing platform (1). The detection component (8) includes a positioning rod (807), a positioning plate (808) is fixed at the bottom of the positioning rod (807), the top of the positioning rod (807) is connected to the bottom of the tension gauge (809), and the bottom ends of the clamping bracket (6) below are connected to the top of the tension gauge (809) by steel wire rope (810). A pressure plate (806) is axially slidably installed on the positioning rod (807). When the pressure plate (806) pushes the positioning plate (808) down, it performs a tensile test on the kraft paper. When the pressure plate (806) blocks and limits the positioning plate (808), the pressure application component (7) applies vertical pressure to the kraft paper to perform a compression test.

2. The compressive strength testing device for kraft paper production according to claim 1, characterized in that, The testing platform (1) is fixedly equipped with a testing host (4) at the upper end. The tension gauge (809) is connected to the testing host (4) in communication. The testing platform (1) has a clearance groove (102) through which the steel wire rope (810) and the tension gauge (809) pass.

3. The compressive strength testing device for kraft paper production according to claim 1, characterized in that, Both ends of the clamp (5) are rotatably mounted with a first connecting rod (501). The end of the first connecting rod (501) at one end is rotatably engaged with a screw sleeve (502), and the end of the first connecting rod (501) at the other end is rotatably engaged with a sliding sleeve (503). A locking bolt (504) is rotatably mounted on the upper end of the sliding sleeve (503).

4. The compressive strength testing device for kraft paper production according to claim 3, characterized in that, The clamping brackets (6) are symmetrically arranged at both ends of the clamping plate (5). A sliding rod (601) is fixedly provided inside the clamping brackets (6). Both ends of the clamping plate (5) are slidably installed on the corresponding sliding rod (601). A clamping screw (602) is rotatably installed on the side wall of one end of the clamping bracket (6). The screw sleeve (502) is threadedly installed on the clamping screw (602). A limiting plate (603) is fixedly provided on the side wall of the clamping bracket (6) at the other end. The sliding sleeve (503) is slidably installed on the limiting plate (603).

5. The compressive strength testing device for kraft paper production according to claim 3, characterized in that, Each set of clamps (5) has interlocking serrated rubber layers (505) fixed on its inner wall.

6. The compressive strength testing device for kraft paper production according to claim 1, characterized in that, The detection assembly (8) also includes a bidirectional screw (801) and a smooth rod (803) arranged in parallel. The two ends of the bidirectional screw (801) are rotatably engaged with the detection table (1). A hand crank (802) is fixedly connected to one end of the bidirectional screw (801). The two ends of the smooth rod (803) are fixedly connected to the detection table (1). A pair of movable plates (804) are symmetrically threaded at both ends of the bidirectional screw (801). The movable plates (804) are slidably installed on the smooth rod (803). The bottom of the movable plates (804) is rotatably engaged with one end of the second connecting rod (805). The other end of the second connecting rod (805) is rotatably engaged with the pressure plate (806).

7. The compressive strength testing device for kraft paper production according to claim 1, characterized in that, The pressure application assembly (7) includes a mounting plate (701), an electric slide rail (201) is provided on the side wall of the top frame (2), and slide seats (702) that slide and cooperate with the electric slide rail (201) are fixed at both ends of the mounting plate (701). A transverse screw (703) driven to rotate by a servo motor (704) is rotatably mounted on the mounting plate (701). A transverse support (705) is threaded through the transverse screw (703). A cylinder fixing plate (706) is fixedly connected to one end of the transverse support (705). A push cylinder (707) is fixedly mounted on the cylinder fixing plate (706). A pressure head (708) is provided at the output end of the push cylinder (707).

8. The compressive strength testing device for kraft paper production according to claim 1, characterized in that, The flattening roller (3) is rotatably mounted on the rotating support (301) at both ends. The flattening roller (3) is provided with a sliding frame (302) at both ends. The sliding frame (302) is fixed on the upper end of the top frame (2). The rotating support (301) is symmetrically slidably mounted on both ends of the sliding frame (302). A top spring (303) is provided between the rotating support (301) and the sliding frame (302).

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