A new type of corrugated board strength detection device

Abstract

The present application relates to the technical field of corrugated board strength detection, and provides a novel corrugated board strength detection device, which comprises a workbench and a pneumatic cylinder; a control panel is installed at the front end of the workbench, a pneumatic cylinder is installed at the top end of the workbench, a pressure sensor is installed at the bottom end of the pneumatic cylinder, an upper pressing seat is installed at the bottom end of the pressure sensor, a mounting seat is installed on the surface of the workbench, and a clamping structure is arranged at the top end of the mounting seat; the clamping structure comprises a connecting seat, the connecting seat is installed on both sides of the top end of the mounting seat, an extension spring is installed on one side of the connecting seat, and a connecting block is installed on one side of the extension spring. The present application realizes flexible clamping through the extension spring, the clamping force is soft and uniform, the sample clamping is firm and does not slip, the rigid clamping is avoided to cause the corrugated peak to be pressed and deformed and collapse, the original structural integrity of the sample is effectively protected, and the sample is prevented from being damaged in advance to cause the detection data to be distorted.

Description

Technical Field

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

[0002] Corrugated cardboard, due to its lightweight, ease of processing, recyclability, and excellent cushioning and protective properties, has become the most widely used basic material in modern logistics and packaging. Currently, ordinary corrugated paper is mostly made from recycled fibers or conventional wood pulp, which has problems such as insufficient compressive and edge crush strength, easy softening when exposed to moisture, easy failure of interlayer adhesion, and easy deformation after repeated use. Now, new materials of corrugated paper, represented by modified fibers, bio-based additives, composite reinforcing components, and functional adhesive systems, can significantly improve the compressive strength, burst strength, moisture resistance, impact resistance, and dimensional stability of cardboard through fiber modification, interface reinforcement, and structural synergistic design. These new types of corrugated paperboard have been widely used. In the production process of new corrugated paperboard, it is necessary to conduct a strength test on its strength. To this end, patent CN217654903U discloses a corrugated cardboard edge crush strength testing device, relating to the field of corrugated paper production equipment technology. It includes a workbench, a clamping assembly, and a pressure measuring assembly. The clamping assembly is positioned above the workbench and includes a driving component and two symmetrically arranged moving blocks on the workbench. Each moving block is connected to the driving component, which drives the two moving blocks to move towards or away from each other. Both moving blocks extend beyond the upper surface of the workbench. A first sliding groove is provided on the upper surface of the workbench for the two moving blocks to slide. The pressure measuring assembly is positioned above the clamping assembly and is used to press the corrugated cardboard to measure its pressure. This application has the effect of reducing the possibility of operator accidents. The existing technical solutions described above have the following drawbacks: When performing strength tests on corrugated paper samples, the aforementioned technology clamps the corrugated paper samples using clamping plates on both sides. However, this clamping method directly and rigidly compresses the sides of the corrugated paperboard, which can easily cause the corrugated peaks to deform and collapse under pressure. This results in structural damage to the sample before formal loading, affecting the accuracy of the test and the authenticity of the data. Therefore, a new type of corrugated paperboard strength testing device is needed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a novel corrugated cardboard strength testing device to solve the problem that existing novel corrugated cardboard strength testing devices directly and rigidly compress the sides of the corrugated cardboard when clamping it, which easily causes the corrugated peaks to deform and collapse under pressure, resulting in structural damage to the sample before formal loading, affecting the testing accuracy and data authenticity.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a novel corrugated cardboard strength testing device, comprising a worktable and a cylinder; A control panel is installed at the front end of the workbench, a cylinder is installed at the top of the workbench, a pressure sensor is installed at the bottom of the cylinder, an upper pressure seat is installed at the bottom of the pressure sensor, a mounting seat is installed on the surface of the workbench, and a clamping structure is provided at the top of the mounting seat. The clamping structure includes a connecting seat, which is installed on both sides of the top of the mounting base. A telescopic spring is installed on one side of the connecting seat, a connecting block is installed on one side of the telescopic spring, a clamping plate is installed on one side of the connecting block, an mounting wheel is installed at one end of the connecting block, a gear sleeve is installed on the outer side of the mounting wheel, a check tooth is installed on the inner side of the gear sleeve, an mounting groove is opened inside one side of the mounting wheel, an mounting rod is installed inside the mounting groove, a pawl is installed on the outer side of the mounting rod, and a return spring is installed on one side of the pawl.

[0005] Preferably, a bidirectional lead screw is installed inside the mounting base, and threaded sleeves are installed on both sides of the two ends of the bidirectional lead screw. The top end of the threaded sleeve is connected to the bottom end of the connecting base. One side of the reset spring is fixed to one side inside the mounting groove, and compression frames are installed on both sides of the mounting base.

[0006] Preferably, a rack is installed at the bottom end of the gear sleeve, an mounting plate is installed at the front end of the rack, a rotating rod is installed inside the mounting plate, one end of the rotating rod is connected to one end of the rack, and the rotating rod and the inside of the mounting plate are threaded together.

[0007] Preferably, the two ends of the telescopic spring are fixed to one side of the connecting block and the connecting seat, respectively, and the connecting block and the connecting seat form a flexible connection.

[0008] Preferably, a worm gear is installed at one end of the bidirectional lead screw, a worm is installed at the bottom end of the worm gear, and a handle is installed at one end of the worm.

[0009] Preferably, the clamping plates are provided in two sets, and the two sets of clamping plates are symmetrically distributed at the top of the mounting base.

[0010] Preferably, the clamping plate has an auxiliary structure inside, the auxiliary structure including a slide groove, the slide groove being formed inside the clamping plate, an anti-bending plate being installed inside the slide groove, an mounting bracket being installed on one side of the top of the anti-bending plate, a support plate being installed on one side of the connecting seat, and a fixing spring being installed on the top of the support plate and the top of the connecting block, the top of the fixing spring being connected to the bottom of the mounting bracket.

[0011] Preferably, guide grooves are provided on both sides of the inside of the slide groove, and guide blocks are installed on both sides of the anti-bending plate. The guide blocks are inserted into the inside of the guide grooves, and the guide blocks and guide grooves form a guide connection.

[0012] Preferably, there are two sets of fixing springs, and the two sets of fixing springs and the mounting bracket form a telescopic structure.

[0013] Preferably, the anti-bending plate is inserted into the interior of the sliding groove, and the anti-bending plate forms a sliding connection inside the sliding groove.

[0014] The present invention provides a novel corrugated cardboard strength testing device, the advantages of which are: With a clamping structure, the clamping mechanism is driven by a worm gear and a two-way lead screw during clamping. The transmission is smooth and the self-locking is strong. It can accurately control the synchronous movement of the two sets of clamping plates in opposite directions, ensuring that the corrugated paper sample is centered and uniformly stressed, providing a stable clamping foundation for strength testing.

[0015] Furthermore, flexible clamping is achieved through telescopic springs, resulting in a gentle and uniform clamping force. This ensures that the sample is firmly clamped without slipping, while avoiding the deformation and collapse of the corrugated peaks caused by rigid clamping. This effectively protects the original structural integrity of the sample and prevents the distortion of test data due to premature sample damage.

[0016] Furthermore, a gear sleeve and rack meshing ratchet check structure is adopted. During the clamping process, the gear sleeve is allowed to rotate freely for smooth feeding. After clamping in place, the ratchet and check teeth achieve one-way limit, reliably preventing the clamping plate from moving backward, ensuring that the clamping state remains stable when the corrugated paper is deformed under pressure, without loosening or displacement. With the addition of an auxiliary structure, the anti-bending plate slides along the guide block and guide groove, ensuring stable movement guidance, preventing deviation and jamming, and guaranteeing that the lateral limit is always uniform and reliable.

[0017] Furthermore, the mounting bracket and anti-bending plate are automatically reset by a fixed spring, and can quickly return to the initial state after the test is completed without manual adjustment, thus improving the efficiency of continuous testing.

[0018] Furthermore, the anti-bending plate can simultaneously constrain the lateral expansion at the top of the corrugated paper sample and the bending bulge in the middle, effectively preventing the sample from tilting to one side, becoming unstable and tipping over, and keeping the sample in a vertical axially compressed state at all times.

[0019] Furthermore, by having the anti-bending plate move downwards in real time along with the indenter, it can always correspond to the dynamic deformation area of ​​the sample. The timing of the limit is precise and the area is matched, which significantly improves the authenticity and stability of the strength test data. The initial position of the anti-bending plate corresponds to the easily bent area in the middle of the sample. The limit effect is direct and efficient, which further ensures the stability of the test process and the accuracy of the results.

[0020] Furthermore, after the test is completed, the clamping limit can be quickly released by rotating the rotating rod, so that the clamping structure can be automatically reset. The operation is simple and convenient for continuous batch testing. Attached Figure Description

[0021] Figure 1 This is a frontal three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below; Figure 3 This is a top-view partial cross-sectional three-dimensional structural schematic diagram of the present invention; Figure 4 for Figure 3 A magnified three-dimensional structural diagram of a portion of point A in the middle; Figure 5 This is a frontal three-dimensional structural diagram of the clamping structure of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the clamping structure of the present invention, viewed from the front cross-section. Figure 7 This is a partial three-dimensional structural diagram of the clamping structure of the present invention; Figure 8 This is a top-view three-dimensional structural diagram of the clamping structure of the present invention; Figure 9 This is a three-dimensional structural diagram of the clamping structure of the present invention, viewed from below. Figure 10 This is a side view of the three-dimensional structure of the auxiliary structure of the present invention; Figure 11 This is a frontal three-dimensional structural diagram of the ratchet of the present invention; Figure 12 This is a side view three-dimensional structural diagram of the ratchet of the present invention.

[0022] The following are the annotations in the diagram: 1. Workbench; 2. Control panel; 3. Mounting base; 4. Cylinder; 5. Clamping structure; 501. Connecting seat; 502. Extrusion frame; 503. Connecting block; 504. Clamping plate; 505. Rack; 506. Mounting plate; 507. Rotating rod; 508. Worm gear; 509. Worm; 5010. Handle; 5011. Telescopic spring; 5012. Gear sleeve; 5013. Thread sleeve 5014, Double-acting lead screw; 5015, Mounting wheel; 5016, Check valve tooth; 5017, Mounting groove; 5018, Pawl; 5019, Return spring; 5020, Mounting rod; 6, Pressure sensor; 7, Upper pressure seat; 8, Auxiliary structure; 801, Mounting bracket; 802, Anti-bending plate; 803, Slide groove; 804, Guide block; 805, Fixed spring; 806, Support plate; 807, Guide groove. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-12 The present invention provides a novel corrugated cardboard strength testing device, comprising a workbench 1 and a cylinder 4; a control panel 2 is installed at the front end of the workbench 1, a cylinder 4 is installed at the top end of the workbench 1, a pressure sensor 6 is installed at the bottom end of the cylinder 4, an upper pressure seat 7 is installed at the bottom end of the pressure sensor 6, a mounting seat 3 is installed on the surface of the workbench 1, and a clamping structure 5 is provided at the top end of the mounting seat 3.

[0025] Reference Figures 1-12 As shown, the clamping structure 5 includes a connecting seat 501, which is installed on both sides of the top of the mounting seat 3. A telescopic spring 5011 is installed on one side of the connecting seat 501, a connecting block 503 is installed on one side of the telescopic spring 5011, a clamping plate 504 is installed on one side of the connecting block 503, a mounting wheel 5015 is installed at one end of the connecting block 503, a gear sleeve 5012 is installed on the outer side of the mounting wheel 5015, a check tooth 5016 is installed on the inner side of the gear sleeve 5012, a mounting groove 5017 is opened inside one side of the mounting wheel 5015, a mounting rod 5020 is installed inside the mounting groove 5017, a pawl 5018 is installed on the outer side of the mounting rod 5020, and a return spring 5019 is installed on one side of the pawl 5018. The mounting base 3 houses a bidirectional lead screw 5014. Sleeves 5013 are installed on both ends of the bidirectional lead screw 5014. The top of each sleeve 5013 is connected to the bottom of the connecting base 501. One side of the return spring 5019 is fixed to one side inside the mounting groove 5017. Compression brackets 502 are installed on both sides of the mounting base 3. A rack 505 is installed at the bottom of the gear sleeve 5012. A mounting plate 506 is installed at the front end of the rack 505. A rotating rod 507 is installed inside the mounting plate 506. One end of the rotating rod 507 is connected to the rack. One end of 505 is connected to the rotating rod 507, which is threadedly connected to the inside of the mounting plate 506; the two ends of the telescopic spring 5011 are respectively fixed to one side of the connecting block 503 and the connecting seat 501, and the connecting block 503 and the connecting seat 501 form a flexible connection; one end of the bidirectional screw 5014 is equipped with a worm gear 508, the bottom end of the worm gear 508 is equipped with a worm 509, and one end of the worm 509 is equipped with a handle 5010; two sets of clamping plates 504 are provided, and the two sets of clamping plates 504 are symmetrically distributed at the top of the mounting seat 3.

[0026] When testing the strength of a corrugated paper sample, first place the corrugated paper sample on top of the mounting base 3. After placement, the operator holds and rotates handle 5010. Rotating handle 5010 drives worm gear 509 to rotate, which in turn drives worm wheel 508 to rotate. Worm wheel 508 then drives bidirectional lead screw 5014 to rotate synchronously. When bidirectional lead screw 5014 rotates, it works with thread sleeve 5013 to move two sets of connecting seats 501 towards each other. During the movement of connecting seats 501, the telescopic spring 5011 pushes connecting block 503 to move synchronously. Connecting block 503 then drives clamping plate 504 to move closer to the center position. When the two sets of clamping plates 504 are in contact with both sides of the corrugated paper sample, the elastic deformation characteristics of telescopic spring 5011 are used to achieve flexible clamping of the corrugated paper sample, making the clamping force uniform and gentle. This avoids the use of rigid clamping to squeeze the sides of the corrugated paper, prevents the sample flute peaks from being deformed or collapsed due to pressure, and avoids the test results being affected by sample structure damage, thereby improving the accuracy of strength test data. When the connecting block 503 moves to one side, it synchronously drives the mounting wheel 5015 to move. The gear sleeve 5012 on the outside of the mounting wheel 5015 meshes with the rack 505. During the continuous movement of the connecting block 503, the gear sleeve 5012 can rotate around the mounting wheel 5015. After the connecting block 503 pushes the clamping plate 504 to complete the flexible clamping of the corrugated paper sample, one end of the pawl 5018 in the mounting groove 5017 abuts against the anti-return tooth 5016 inside the gear sleeve 5012, restricting the gear sleeve 5012 from rotating in the opposite direction. This achieves unidirectional limiting of the clamping plate 504, preventing the corrugated paper sample from pushing the clamping plate 504 backward during the compression deformation process, ensuring the stability and reliability of the clamping state. After the corrugated paper sample is clamped and positioned, the strength test can be carried out.

[0027] Reference Figures 1-12 As shown, an auxiliary structure 8 is provided inside the clamping plate 504. The auxiliary structure 8 includes a slide groove 803, which is formed inside the clamping plate 504. An anti-bending plate 802 is installed inside the slide groove 803. A mounting bracket 801 is installed on one side of the top of the anti-bending plate 802. A support plate 806 is installed on one side of the connecting seat 501. A fixing spring 805 is installed on the top of both the support plate 806 and the top of the connecting block 503. The top of the fixing spring 805 is aligned with the bottom of the mounting bracket 801. Connection; guide grooves 807 are provided on both sides inside the slide groove 803, and guide blocks 804 are installed on both sides of the anti-bending plate 802. The guide blocks 804 are inserted into the interior of the guide grooves 807, and the guide blocks 804 and the guide grooves 807 form a guide connection; two sets of fixing springs 805 are provided, and the two sets of fixing springs 805 and the mounting bracket 801 form a telescopic structure; the anti-bending plate 802 is inserted into the interior of the slide groove 803, and the anti-bending plate 802 forms a sliding connection inside the slide groove 803.

[0028] After the corrugated paper sample is clamped, the cylinder 4 is activated to push the pressure sensor 6 downward, so that the upper pressure seat 7 at the bottom of the pressure sensor 6 contacts the top of the corrugated paper sample, applying stable pressure to the corrugated paper sample to achieve corrugated paper strength testing. During the downward movement of the cylinder 4, the extrusion frame 502 is driven to move downward synchronously. Since the bottom of the extrusion frame 502 is flush with the bottom of the upper pressure seat 7, when the upper pressure seat 7 contacts the top of the corrugated paper sample, the extrusion frame 502 pushes the mounting frame 801 downward synchronously. When the mounting frame 801 moves downward, it drives the anti-bending plate 802 to move synchronously, so that the anti-bending plate 802 slides along the slide groove 803. With the guiding action of the guide block 804 and the guide groove 807, the movement of the anti-bending plate 802 is more stable and reliable. During the downward movement of the mounting frame 801, the fixing spring 805 will be compressed. After the test is completed, the fixing spring 805 can automatically reset the mounting frame 801 by its own elasticity. During vertical compression of the corrugated paper sample, the upper end is first compressed by the upper pressure seat 7, resulting in compression deformation. The upper part is compacted and expands laterally to both sides. As the compression gradually increases, the deformation area extends downward, causing the middle part of the corrugated paper to bend outward and bulge, becoming unstable. Without lateral restraint, the corrugated paper sample is prone to tilting to one side, leading to an imbalance in the stress state and distorted test data. At this time, the use of the anti-bending plate 802 can effectively limit the easily bendable areas at the top and middle of the corrugated paper sample laterally. Its inner side is tightly attached to the side of the sample, which can directly restrain the bending and bulging deformation in the middle, so that the corrugated paper sample always maintains a vertical compression posture. When the corrugated paper sample is compressed, the top is first compacted and bulges outward, causing the middle part to bend outward. The anti-bending plate 802 can simultaneously limit the lateral expansion of the upper part and the instability of the middle part, preventing the corrugated paper from becoming unstable. The sample is tilted to prevent uneven stress caused by unilateral bending, making the pressure test results closer to the true axial compressive strength and improving the accuracy and stability of the test data. At the same time, the anti-bending plate 802 can move down synchronously with the upper pressure seat 7 along the slide groove 803, always corresponding to the real-time deformation area of ​​the corrugated paper sample, avoiding local instability or lateral displacement during compression, and further ensuring the authenticity and reliability of the test results. Moreover, the bottom of the anti-bending plate 802 corresponds to the middle position of the sample in the initial state, which can ensure the stable and reliable limiting effect, thereby completing the strength test of the corrugated paper sample. After the test is completed, the rotating rod 507 is rotated to adjust the position of the rack 505, so that the rack 505 and the gear sleeve 5012 are disengaged, thereby releasing the limiting and restoring the clamping plate 504 to the initial position, which is convenient for the next test operation.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel corrugated cardboard strength testing device, comprising a workbench (1) and a cylinder (4); Its features are: The front end of the workbench (1) is equipped with a control panel (2), the top of the workbench (1) is equipped with a cylinder (4), the bottom end of the cylinder (4) is equipped with a pressure sensor (6), the bottom end of the pressure sensor (6) is equipped with an upper pressure seat (7), the surface of the workbench (1) is equipped with a mounting seat (3), and the top end of the mounting seat (3) is provided with a clamping structure (5). The clamping structure (5) includes a connecting seat (501), which is installed on both sides of the top of the mounting seat (3). A telescopic spring (5011) is installed on one side of the connecting seat (501), a connecting block (503) is installed on one side of the telescopic spring (5011), a clamping plate (504) is installed on one side of the connecting block (503), an mounting wheel (5015) is installed at one end of the connecting block (503), a gear sleeve (5012) is installed on the outer side of the mounting wheel (5015), a check tooth (5016) is installed on the inner side of the gear sleeve (5012), an mounting groove (5017) is opened inside one side of the mounting wheel (5015), an mounting rod (5020) is installed inside the mounting groove (5017), a pawl (5018) is installed on the outer side of the mounting rod (5020), and a return spring (5019) is installed on one side of the pawl (5018).

2. The novel corrugated cardboard strength testing device according to claim 1, characterized in that: The mounting base (3) is equipped with a bidirectional lead screw (5014), and the two ends of the bidirectional lead screw (5014) are equipped with thread sleeves (5013). The top end of the thread sleeves (5013) is connected to the bottom end of the connecting base (501). One side of the reset spring (5019) is fixed to one side inside the mounting groove (5017). The two sides of the mounting base (3) are equipped with compression frames (502).

3. The novel corrugated cardboard strength testing device according to claim 1, characterized in that: A rack (505) is installed at the bottom end of the gear sleeve (5012), and an mounting plate (506) is installed at the front end of the rack (505). A rotating rod (507) is installed inside the mounting plate (506), and one end of the rotating rod (507) is connected to one end of the rack (505). The rotating rod (507) and the interior of the mounting plate (506) are connected by a thread.

4. The novel corrugated cardboard strength testing device according to claim 1, characterized in that: The two ends of the telescopic spring (5011) are respectively fixed to one side of the connecting block (503) and the connecting seat (501), and the connecting block (503) and the connecting seat (501) form a flexible connection.

5. The novel corrugated cardboard strength testing device according to claim 2, characterized in that: One end of the bidirectional lead screw (5014) is equipped with a worm gear (508), the bottom end of the worm gear (508) is equipped with a worm (509), and one end of the worm (509) is equipped with a handle (5010).

6. The novel corrugated cardboard strength testing device according to claim 1, characterized in that: The clamping plate (504) is provided in two sets, and the two sets of clamping plates (504) are symmetrically distributed at the top of the mounting base (3).

7. The novel corrugated cardboard strength testing device according to claim 1, characterized in that: The clamping plate (504) is provided with an auxiliary structure (8) inside. The auxiliary structure (8) includes a slide groove (803). The slide groove (803) is opened inside the clamping plate (504). An anti-bending plate (802) is installed inside the slide groove (803). A mounting bracket (801) is installed on one side of the top of the anti-bending plate (802). A support plate (806) is installed on one side of the connecting seat (501). A fixing spring (805) is installed on the top of the support plate (806) and the top of the connecting block (503). The top of the fixing spring (805) is connected to the bottom of the mounting bracket (801).

8. A novel corrugated cardboard strength testing device according to claim 7, characterized in that: The slide groove (803) has guide grooves (807) on both sides inside, and guide blocks (804) are installed on both sides of the anti-bending plate (802). The guide blocks (804) are inserted into the guide grooves (807), and the guide blocks (804) and the guide grooves (807) form a guide connection.

9. A novel corrugated cardboard strength testing device according to claim 7, characterized in that: The fixed spring (805) is provided in two sets, and the two sets of fixed springs (805) and the mounting bracket (801) form a telescopic structure.

10. A novel corrugated cardboard strength testing device according to claim 7, characterized in that: The anti-bending plate (802) is inserted into the interior of the slide groove (803), and the anti-bending plate (802) forms a sliding connection inside the slide groove (803).

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