Pressurizing device for fiberboard toughness test and fiberboard toughness test equipment

Abstract

The invention relates to the field of toughness testing, in particular to a pressurizing device for testing toughness of a fiberboard and fiberboard toughness testing equipment, and the pressurizing device comprises a testing assembly capable of pressing the fiberboard and a hydraulic driving unit; the testing assembly comprises a rotating frame, a rotating shaft, a triggering plate, a pushing assembly and a locking unit; the rotating frame is rotationally arranged below the hydraulic driving unit in the horizontal direction, a pressing head is arranged on each corner of the rotating frame, and a penetrating groove is formed in the center of the rotating frame in the horizontal direction in a penetrating mode; the rotating shaft is rotationally arranged in the through groove in the horizontal direction; a plurality of trigger plates are uniformly arranged around the axis of the rotating shaft; the pushing assembly is arranged on the rotating shaft and used for driving the trigger plate to move. The locking unit is arranged on one side of the rotating frame and used for limiting rotation of the rotating frame. The hydraulic driving unit comprises a lifting frame moving in the vertical direction. According to the invention, the test efficiency is improved, and the accuracy of the test result is ensured.

Description

Technical Field

[0001] This invention relates to the field of toughness testing, specifically to a pressurization device and a fiberboard toughness testing equipment for testing fiberboard toughness. Background Technology

[0002] Toughness refers to a material's ability to absorb energy and undergo plastic deformation without breaking when subjected to external forces (such as impact, tension, bending, etc.). Currently, the common method for testing the toughness of fiberboard is to fix the fiberboard on both sides, and then manually add a weight to the middle of the fiberboard to bend it. When the fiberboard breaks, the toughness can be tested based on the weight on it. However, this method requires the tester to continuously add weight, which is time-consuming. Furthermore, if the fiberboard breaks while the tester is placing the weight, all the weight will fall and could injure the tester, causing a safety accident.

[0003] Chinese Patent Publication No. CN111257115B discloses a fiberboard toughness testing device, including a base, sliding rods, a top plate, connecting plates, and a mounting plate. Four sliding rods are connected to the top of the base, and the top plate is connected to the tops of the two outer sliding rods. Connecting plates are connected to both sides of the top plate, and the bottoms of the two connecting plates are respectively connected to the tops of the two middle sliding rods. The mounting plate is connected to the middle of the top plate. The device also includes a drive mechanism and a pressurizing device. The drive mechanism and pressurizing device are mounted on the mounting plate, and are connected in a transmission connection. The drive mechanism includes a motor, a worm gear, a worm wheel, a connecting shaft, a first gear, and a second gear. The motor is mounted on the top of the mounting plate, and the worm gear is connected to the output shaft of the motor. The worm gear is rotatably connected to the top plate. A worm wheel is rotatably connected to the upper rear side of the mounting plate, and the worm wheel cooperates with the worm gear. A connecting shaft is connected to the worm wheel, which passes through the mounting plate. The portion of the connecting shaft that extends through the mounting plate is connected to the first gear and the second gear, with the second gear located in front of the first gear.

[0004] The aforementioned method first bends the fiberboard to a certain degree, then compresses both ends, causing the fiberboard to be subjected to two pressures during bending. In subsequent data processing, it's impossible to calculate these two pressures, leading to discrepancies in test results. Existing toughness testing equipment typically includes a pressurizing device and a support device. The pressurizing device comprises a testing assembly and a hydraulic drive unit. The testing assembly includes a test head that directly presses the fiberboard. However, the shape of the test head significantly affects the test results. Therefore, to improve accuracy, different test heads need to be used when testing the same fiberboard. These test heads include V-shaped, U-shaped, and semi-circular types, requiring multiple head changes during testing, resulting in low testing efficiency. If all test heads are integrated into a test head assembly, the assembly can switch between them via rotation. However, the assembly is subject to reaction forces during use, making the rotating shaft susceptible to pressure and wear. Ultimately, this makes it difficult for the test heads to maintain a vertical position after switching. Summary of the Invention

[0005] To address the aforementioned problems, a pressure boosting device and a fiberboard toughness testing device are provided. By setting up a rotating frame with multiple pressing heads on it, the testing efficiency is improved by switching between different pressing heads simply by rotating the frame. Simultaneously, a through slot is formed in the rotating frame, within which a rotating shaft is positioned. A trigger plate is located around the rotating shaft, moving radially along it. Furthermore, a locking unit is located on one side of the rotating frame to lock it in place. Therefore, when the pressing heads press on the fiberboard, the trigger plate disengages from the through slot, and the reaction force from the pressing heads is not applied to the rotating shaft. Instead, the locking unit bears the pressure, preventing bending deformation of the rotating shaft and ensuring that the pressing heads on the rotating frame do not shift when the rotating shaft drives the frame to rotate.

[0006] To address the problems of the prior art, the present invention provides a pressurizing device for testing the toughness of fiberboard, comprising a testing component capable of pressing the fiberboard and a hydraulic drive unit; The test components include a rotating frame, a rotating shaft, a trigger plate, a push assembly, and a locking unit; The rotating frame is positioned below the hydraulic drive unit and rotates horizontally. The rotating frame has a polygonal structure, with a pressing head at each corner and a through slot running horizontally through the center of the rotating frame. The rotating shaft is installed in the through groove and rotates horizontally. Multiple trigger plates are evenly arranged around the axis of the rotating shaft. The trigger plates can move in the radial direction of the rotating shaft and can contact the inner wall of the through groove. The drive component is mounted on the rotating shaft and is used to drive the trigger plate to move; The locking unit is located on one side of the rotating frame and is used to restrict the rotation of the rotating frame. Before the trigger plate contacts the inner wall of the through slot, the locking unit locks the rotating frame. The hydraulic drive unit includes a lifting frame that moves vertically, and a rotating frame that is rotatably mounted on the lifting frame.

[0007] Preferably, the actuating assembly includes a groove, a first link, a second link, a push plate, and an electric actuator; The groove is formed on the side wall of the groove along the length of the rotation axis, and a sliding groove is formed at one end of the rotation axis along the axis of the rotation axis, and the sliding groove is connected to the groove. The two ends of the first connecting rod are respectively hinged to one end of the groove and the trigger plate; The second link is located on one side of the first link, and one end of the second link is hinged to the trigger plate; The push plate is moved and disposed in the sliding groove along the extension direction of the sliding groove, and the end of the second connecting rod away from the trigger plate is hinged to the push plate; The electric actuator is horizontally positioned on one side of the rotating shaft and is used to drive the push plate to move.

[0008] Preferably, the actuating component further includes a first pressure sensor, a connecting plate, and a ball; The first pressure sensor is located between the electric actuator and the push plate; The connecting plate is fixedly installed at the end of the first pressure sensor facing the push plate, and the connecting plate has a circular structure. Multiple balls are evenly distributed on the connecting plate around its axis, and the balls rotate on the connecting plate.

[0009] Preferably, friction grooves are provided on the inner wall of the through groove and on the end face of the trigger plate facing the inner wall of the through groove.

[0010] Preferably, the locking unit includes a locking slot, a locking block, and a driving unit; The locking groove is horizontally located at the end of the rotating frame; The locking block is horizontally movable and positioned on one side of the locking groove, and can engage with the locking groove. The drive unit is located on one side of the locking block and is used to drive the locking block to move.

[0011] Preferably, the drive unit includes a second rotary driver, a lead screw, and a moving frame; The second rotary drive is horizontally mounted on the lifting frame; The lead screw is horizontally fixed at the output end of the second rotary driver; The movable frame is horizontally movable on the side of the lifting frame, the lead screw horizontally passes through the movable frame and is threaded into the movable frame, and the locking block is horizontally fixed on the movable frame.

[0012] Preferably, a linear actuator is vertically installed above the lifting frame, and a straightening column is vertically installed at the end of the linear actuator.

[0013] Preferably, a vertical pass-through groove is provided at the lower part of the straightening column for the lead screw to pass through.

[0014] Preferably, the hydraulic drive unit includes a lifting plate that moves in a vertical direction, and a second pressure sensor is provided between the lifting plate and the lifting frame.

[0015] The present invention also relates to a fiberboard toughness testing device, characterized in that it includes a pressure boosting device for fiberboard toughness testing.

[0016] The advantages of this invention compared to the prior art are: 1. This invention, by setting up a rotating frame and installing multiple pressing heads on it, achieves improved testing efficiency during fiberboard toughness testing. Different pressing heads can be switched by rotating the frame, allowing for pressure application on the fiberboard, thus improving testing efficiency. Simultaneously, a through-slot is provided on the rotating frame, within which a rotating shaft is positioned. A trigger plate is located around the rotating shaft, moving radially along the shaft. Furthermore, a locking unit is located on one side of the rotating frame to lock it in place. Therefore, when the pressing heads press on the fiberboard, the trigger plate disengages from the through-slot, and the reaction force from the pressing heads is not applied to the rotating shaft. Instead, the locking unit bears the pressure, preventing bending deformation of the rotating shaft and ensuring that the pressing heads on the rotating frame do not shift when the rotating shaft drives the frame to rotate. In summary, this invention eliminates the need to replace the pressing heads during fiberboard testing and prevents bending of the rotating shaft when driving the rotating frame, thus improving testing efficiency and ensuring the accuracy of test results.

[0017] 2. The present invention provides a ball bearing on the connecting plate. When the first rotary driver drives the rotating shaft to rotate, the connecting plate rolls with the push plate through the ball bearing, which reduces the coefficient of friction between the connecting plate and the push plate. This not only reduces the wear between the connecting plate and the push plate, but also reduces the load on the first rotary driver when driving the rotating shaft to rotate.

[0018] 3. By setting a linear actuator and a straightening column, after the rotating frame completes its rotation, the linear actuator drives the straightening column to descend, so that the lower end face of the straightening column contacts the upper end face of the rotating frame, thereby completing the straightening operation of the rotating frame and ensuring that the pressing head set at the bottom of the rotating frame is in a vertically downward state. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a fiberboard toughness testing device according to the present invention.

[0020] Figure 2 This is a cross-sectional perspective view of a fiberboard toughness testing device according to the present invention.

[0021] Figure 3 This invention relates to a fiberboard toughness testing device. Figure 2 A magnified view of a portion of point A in the middle.

[0022] Figure 4 This invention relates to a fiberboard toughness testing device. Figure 2 A magnified view of a portion of point B in the middle.

[0023] Figure 5 This is a three-dimensional schematic diagram of a pressure boosting device for testing the toughness of fiberboard according to the present invention, after the lifting frame has been removed.

[0024] Figure 6 This is a side view of a pressure boosting device for testing the toughness of fiberboard according to the present invention.

[0025] Figure 7 This invention relates to a pressure boosting device for testing the toughness of fiberboard. Figure 6 A cross-sectional view at point CC.

[0026] Figure 8 This is a cross-sectional three-dimensional schematic diagram of a pressure boosting device for testing the toughness of fiberboard according to the present invention.

[0027] Figure 9 This invention relates to a pressure boosting device for testing the toughness of fiberboard. Figure 8 A magnified view of a portion of point D.

[0028] Figure 10 This invention relates to a pressure boosting device for testing the toughness of fiberboard. Figure 8 A magnified view of a portion of point E in the middle.

[0029] Figure 11 This is a three-dimensional schematic diagram of a pressure boosting device for testing the toughness of fiberboard according to the present invention, with the lifting frame, locking block and push plate removed.

[0030] The diagram is labeled as follows: 1. Test assembly; 11. Rotating frame; 111. Pressing head; 112. Through slot; 12. Rotating shaft; 121. First rotary actuator; 13. Trigger plate; 131. Friction groove; 14. Push assembly; 141. Groove; 142. First connecting rod; 143. Second connecting rod; 144. Push plate; 145. Electric push rod; 146. First pressure sensor; 147. Connecting plate; 148. Ball; 15. Locking unit; 151. Locking groove; 152. Locking block; 153. Drive unit; 1531. Second rotary actuator; 1532. Lead screw; 1533. Moving frame; 16. Linear actuator; 17. Correction column; 171. Through slot; 2. Hydraulic drive unit; 21. Lifting frame; 22. Lifting plate; 23. Second pressure sensor; 3. Support device; 4. Fiberboard. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1-5 A pressure boosting device for testing the toughness of fiberboard includes a test component 1 capable of pressing the fiberboard 4 and a hydraulic drive unit 2153. Test component 1 includes a rotating frame 11, a rotating shaft 12, a trigger plate 13, a pushing component 14, and a locking unit 15; The rotating frame 11 is rotatably positioned below the hydraulic drive unit 2153 in the horizontal direction. The rotating frame 11 has a polygonal structure, with a pressing head 111 at each corner of the rotating frame 11. A through slot 112 is provided in the center of the rotating frame 11 in the horizontal direction. The rotating shaft 12 is rotatably disposed within the through groove 112 in a horizontal direction; Multiple trigger plates 13 are evenly arranged around the axis of the rotating shaft 12. The trigger plates 13 can move in the radial direction of the rotating shaft 12 and can contact the inner wall of the through groove 112. The drive assembly 14 is mounted on the rotating shaft 12 and is used to drive the trigger plate 13 to move. The locking unit 15 is located on one side of the rotating frame 11 and is used to restrict the rotation of the rotating frame 11. Before the trigger plate 13 contacts the inner wall of the through groove 112, the locking unit 15 locks the rotating frame 11. The hydraulic drive unit 2153 includes a lifting frame 21 that moves in a vertical direction, and a rotating frame 11 that is rotatably mounted on the lifting frame 21.

[0033] Below the pressurizing device is a support device 3 for supporting the fiberboard 4. When the support device 3 supports the fiberboard 4, there are two force points on the fiberboard 4. When the test component 1 is pressed down by the hydraulic drive unit 2153, the contact point between the test component 1 and the board is located between the two force points. In the prior art, when performing toughness testing on the same batch of fiberboard 4, multiple pressing heads 111 are required to test the toughness of the fiberboard 4. This is because the pressure required to break the fiberboard 4 varies when different pressing heads 111 are used. In order to accurately test the toughness of the fiberboard 4, the operator needs to change the pressing head 111 during the test. That is, a different pressing head 111 needs to be changed every time the fiberboard 4 is tested, which leads to frequent changes of the pressing head 111 during the test, resulting in low efficiency. To overcome the above problems, all the pressing heads 111 can be integrated into a rotating frame 11, which is then placed on the lifting frame 21. The rotating frame 11 is directly driven by a motor. However, the pressing head 111 needs to press the fiberboard 4 to test it. The reaction force generated by the pressing will act between the rotating frame 11 and the motor, causing the motor output end to bend and be damaged. Similarly, if a rotating shaft 12 is set on the motor output end to indirectly drive the rotating frame 11, although damage to the motor output shaft can be avoided, the rotating shaft 12 will bend. This will cause the rotating frame 11 to be prone to positioning deviation during subsequent rotation. That is, when the rotating frame 11 drives the pressing head 111 to rotate to the side facing the fiberboard 4, the pressing head 111 will be offset. This means that when the pressing head 111 presses the fiberboard 4, the force exerted by the pressing head 111 on the fiberboard 4 is not in a vertical downward state, which has a significant impact on the final test results.

[0034] To avoid the aforementioned situation, the structure of the existing pressure device for testing the toughness of fiberboard 4 was optimized. This optimized design ensures that the rotating frame 11 can rotate normally, and that the reaction force generated during the pressing of the pressing head 111 onto the fiberboard 4 is not transmitted to the rotating shaft 12, preventing bending of the rotating shaft 12. This ensures that the pressing head 111 remains correctly positioned when switching between different pressing heads, preventing any displacement and thus guaranteeing the accuracy of the test results. The specific structure and working process of this invention are as follows: The rotating frame 11 is equipped with multiple pressing heads 111. The accompanying drawings show three types of pressing heads 111: hemispherical, U-shaped, and V-shaped. When testing the same batch of fiberboard 4, all three types of pressing heads 111 are used to press the fiberboard 4. During testing, the fiberboard 4 is first placed horizontally on the support device 3. Then, the lifting frame 21 in the hydraulic drive unit 2153 descends under hydraulic pressure, causing the rotating frame 11 to descend synchronously. At this time, one of the pressing heads 111 on the rotating frame 11 is at the lowest point of the rotating frame 11. The trigger plate 13 is not in contact with the inner wall of the through groove 112, and the locking unit 15 locks the rotating frame 11. The pressing head 111 at the lowest point of the rotating frame 11 then contacts the fiberboard 4 and presses against it. 4. When pressing, the reaction force generated by the pressing head 111 pressing against the fiberboard 4 is transmitted to the locking unit 15. The reaction force is vertically upward. During this process, the trigger plate 13 on the rotating shaft 12 is in contact with the rotating frame 11, so the rotating shaft 12 is not affected by the reaction force, avoiding bending of the rotating shaft 12 during the pressing of the fiberboard 4 by the pressing head 111. When the fiberboard 4 on the support device 3 breaks, the pressure applied at this time is recorded. Then the lifting frame 21 is raised, and at the same time, the trigger plate 13 arranged around the rotating shaft 12 begins to move in the radial direction of the rotating shaft 12 and contacts the inner wall of the through groove 112. Then the locking unit 15 is unlocked, and the rotating shaft 12 provides support to the rotating frame 11 through the trigger plate 13. A first rotary driver 121 for driving the rotating shaft 12 to rotate is provided at the end of the rotating shaft 12. The first rotary driver 121 is preferably a servo motor. The first rotary driver 121 drives the rotating shaft 12 to rotate, and the rotating shaft 12 is driven by the trigger plate 13 to rotate. The rotating frame 11 rotates. In this invention, only three pressing heads 111 are provided. Therefore, the rotating frame 11 stops after rotating 120 degrees each time. After the rotating frame 11 stops rotating, the locking unit 15 first locks the rotating frame 11. Then, the trigger plate 13 disengages from the through groove 112. The worker places the new fiberboard 4 on the support device 3. The lifting frame 21 drives the rotating frame 11 to descend, so that the pressing head 111 at the bottom of the rotating frame 11 contacts the fiberboard 4 and presses the fiberboard 4. This process is repeated.

[0035] By setting a rotating frame 11 and multiple pressing heads 111 on the rotating frame 11, the toughness test of the fiberboard 4 can be performed by simply rotating the rotating frame 11 to switch between different pressing heads 111, thus improving the testing efficiency. Meanwhile, a through slot 112 is provided on the rotating frame 11, and a rotating shaft 12 is arranged within the through slot 112. A trigger plate 13 is arranged around the rotating shaft 12, and the trigger plate 13 can move radially along the rotating shaft 12. Additionally, a locking unit 15 is provided on one side of the rotating frame 11 to lock the rotating frame 11 in place. Therefore, when the pressing head 111 presses the fiberboard 4, the trigger plate 13 disengages from the through groove 112. The reaction force received by the pressing head 111 during pressing does not act on the rotating shaft 12, but is instead borne by the locking unit 15. This prevents the rotating shaft 12 from bending and deforming under stress, ensuring that the pressing head 111 on the rotating frame 11 does not shift when the rotating shaft 12 drives the rotating frame 11 to rotate. In summary, this invention eliminates the need to replace the pressing head 111 when testing the fiberboard 4 and prevents the rotating shaft 12 from bending when driving the rotating frame 11 to rotate, thus improving testing efficiency and ensuring the accuracy of test results.

[0036] Reference Figure 9 and Figure 10 The push assembly 14 includes a groove 141, a first connecting rod 142, a second connecting rod 143, a push plate 144, and an electric push rod 145; The groove 141 is formed on the side wall of the groove 141 along the length direction of the rotating shaft 12, and a sliding groove is formed at one end of the rotating shaft 12 along the axial direction of the rotating shaft 12, and the sliding groove is connected to the groove 141. The two ends of the first connecting rod 142 are respectively hinged to one end of the groove 141 and the trigger plate 13; The second link 143 is located on one side of the first link 142, and one end of the second link 143 is hinged to the trigger plate 13; The push plate 144 is moved and disposed in the sliding groove along the extension direction of the sliding groove, and the end of the second connecting rod 143 away from the trigger plate 13 is hinged to the push plate 144. The electric actuator 145 is horizontally positioned on one side of the rotating shaft 12 and is used to drive the push plate 144 to move.

[0037] When it is necessary for the trigger plate 13 to move radially toward the inner wall of the through groove 112 along the rotating shaft 12, the electric actuator 145 pushes the push plate 144, causing the push plate 144 to move toward the bottom of the sliding groove. At this time, the included angle between the first link 142 and the second link 143 gradually decreases. Under the action of the first link 142 and the second link 143, the trigger plate 13 moves toward the inner wall of the through groove 112 and finally contacts the inner wall of the through groove 112. Subsequently, when the first rotary driver 121 is started, the rotating shaft 12 can drive the rotating frame 11 to rotate via the trigger plate 13.

[0038] Reference Figure 9 The actuating component 14 also includes a first pressure sensor 146, a connecting plate 147, and a ball 148; The first pressure sensor 146 is disposed between the electric push rod 145 and the push plate 144; The connecting plate 147 is fixedly disposed at the end of the first pressure sensor 146 facing the push plate 144, and the connecting plate 147 has a circular structure. Multiple balls 148 are evenly arranged on the connecting plate 147 around the axis of the connecting plate 147, and the balls 148 are rotatably arranged on the connecting plate 147.

[0039] When the rotating frame 11 needs to rotate, the electric actuator 145 pushes the push plate 144 through the first pressure sensor 146 and the connecting plate 147, causing the first connecting rod 142 and the second connecting rod 143 to exert a squeezing effect on the trigger plate 13, causing the trigger plate 13 to move radially along the rotating shaft 12. Before the trigger plate 13 contacts the inner wall of the through groove 112, the first rotary drive 121 is always in a stopped state. After the trigger plate 13 contacts the inner wall of the through groove 112, the electric actuator 145 continues to run. At this time, the pressure value detected by the first pressure sensor 146 continues to rise. The first pressure sensor 146 is preset with a rated pressure value. When the first pressure sensor 146 reaches a rated pressure value, the electric actuator 145 continues to run. When the pressure value detected by the pressure sensor 146 reaches the preset rated pressure value, the electric actuator 145 stops operating. Then the locking unit 15 unlocks, the first rotary driver 121 starts, and the first rotary driver 121 drives the rotating shaft 12 to rotate. The rotating shaft 12 drives the rotating frame 11 to rotate through the trigger plate 13. After the rotating frame 11 completes the switching of the pressing head 111, the locking unit 15 locks the rotating frame 11 again. Then the output end of the electric actuator 145 retracts, so that the first connecting rod 142 and the second connecting rod 143 drive the trigger plate 13 to move towards the rotating shaft 12, and the trigger plate 13 disengages from the inner wall of the through groove 112. During the above process, when the first rotary driver 121 drives the rotating shaft 12 to rotate, the connecting plate 147 rolls with the push plate 144 through the ball 148, which reduces the coefficient of friction between the connecting plate 147 and the push plate 144. This not only reduces the amount of wear between the connecting plate 147 and the push plate 144, but also reduces the load on the first rotary driver 121 when driving the rotating shaft 12 to rotate.

[0040] Reference Figure 3 Friction grooves 131 are provided on the inner wall of the through groove 112 and on the end face of the trigger plate 13 facing the inner wall of the through groove 112.

[0041] By providing friction grooves 131 on the inner wall of the through groove 112 and on the end face of the trigger plate 13 facing the inner wall of the through groove 112, the coefficient of friction when the trigger plate 13 contacts the inner wall of the through groove 112 is increased, ensuring that the trigger plate 13 will not slip when it contacts the inner wall of the through groove 112.

[0042] Reference Figure 5 and Figure 11 The locking unit 15 includes a locking slot 151, a locking block 152, and a drive unit 153. The locking groove 151 is horizontally opened at the end of the rotating frame 11; The locking block 152 is horizontally movable and disposed on one side of the locking groove 151 and can engage with the locking groove 151. The drive unit 153 is located on one side of the locking block 152 and is used to drive the locking block 152 to move.

[0043] When the locking block 152 engages with the locking groove 151, the locking unit 15 is in a locked state. When the locking block 152 separates from the locking groove 151, the locking unit 15 is in an unlocked state.

[0044] Reference Figure 8 The drive unit 153 includes a second rotary driver 1531, a lead screw 1532, and a moving frame 1533; The second rotary drive 1531 is horizontally mounted on the lifting frame 21; The lead screw 1532 is horizontally fixed on the output end of the second rotary driver 1531; The movable frame 1533 is horizontally movable on the side of the lifting frame 21. The lead screw 1532 horizontally passes through the movable frame 1533 and is threadedly engaged with the movable frame 1533. The locking block 152 is horizontally fixed on the movable frame 1533.

[0045] The second rotary driver 1531 is preferably a servo motor. In order to ensure the pressure bearing capacity of the locking unit 15, locking slots 151 are provided at both ends of the rotating frame 11. Therefore, two moving frames 1533 are also provided. The two moving frames 1533 are located on both sides of the rotating frame 11. The thread on the lead screw 1532 has two sections, and the rotation directions of the two sections are opposite. The two moving frames 1533 are located on the two sections of the thread. When the second rotary driver 1531 drives the lead screw 1532 to rotate, the two moving frames 1533 can move closer to each other or further away from each other.

[0046] Reference Figure 4 and Figure 5 A linear actuator 16 is vertically installed above the lifting frame 21, and a straightening column 17 is vertically installed at the end of the linear actuator 16.

[0047] After the rotating frame 11 completes its rotation, the linear actuator 16 drives the straightening column 17 to descend, so that the lower end face of the straightening column 17 contacts the upper end face of the rotating frame 11, thereby completing the straightening operation of the rotating frame 11 and ensuring that the pressing head 111 located at the bottom of the rotating frame 11 is in a vertically downward state.

[0048] Reference Figure 11 A vertical passage groove 171 is provided at the lower part of the straightening column 17 for the lead screw 1532 to pass through.

[0049] By opening a through groove 171 at the lower part of the straightening column 17, it is ensured that the straightening column 17 can be raised and lowered smoothly, and the lead screw 1532 can also rotate normally.

[0050] Reference Figure 4The hydraulic drive unit 2153 includes a lifting plate 22 that moves vertically, and a second pressure sensor 23 is provided between the lifting plate 22 and the lifting frame 21.

[0051] When the pressing head 111 presses the fiberboard 4, the second pressure sensor 23 can detect the pressure at the pressing head 111 in real time. When the fiberboard 4 breaks, the second pressure sensor 23 can detect the pressure value when the fiberboard 4 breaks.

[0052] Reference Figures 1-11 The present invention also relates to a fiberboard toughness testing device, characterized in that it includes a pressure boosting device for fiberboard toughness testing.

[0053] Working principle: Multiple pressing heads 111 are provided on the rotating frame 11. The accompanying drawings show three types of pressing heads 111: hemispherical, U-shaped, and V-shaped. When testing the same batch of fiberboard 4, all three types of pressing heads 111 are used to press the fiberboard 4. During testing, the fiberboard 4 is first placed horizontally on the support device 3. Then, the lifting frame 21 in the hydraulic drive unit 2153 descends under hydraulic pressure, causing the rotating frame 11 to descend synchronously. At this time, one of the pressing heads 111 on the rotating frame 11 is at the lowest point of the rotating frame 11. The trigger plate 13 is not in contact with the inner wall of the through groove 112. The locking unit 15 locks the rotating frame 11, and the pressing head 111 at the lowest point of the rotating frame 11 contacts the fiberboard 4 and presses against it. 4. When pressing, the reaction force generated by the pressing head 111 pressing against the fiberboard 4 is transmitted to the locking unit 15. The reaction force is vertically upward. During this process, the trigger plate 13 on the rotating shaft 12 is in contact with the rotating frame 11, so the rotating shaft 12 is not affected by the reaction force, avoiding bending of the rotating shaft 12 during the pressing of the fiberboard 4 by the pressing head 111. When the fiberboard 4 on the support device 3 breaks, the pressure applied at this time is recorded. Then the lifting frame 21 is raised, and at the same time, the trigger plate 13 arranged around the rotating shaft 12 begins to move in the radial direction of the rotating shaft 12 and contacts the inner wall of the through groove 112. Then the locking unit 15 is unlocked, and the rotating shaft 12 provides support to the rotating frame 11 through the trigger plate 13. A first rotary driver 121 for driving the rotating shaft 12 to rotate is provided at the end of the rotating shaft 12. The first rotary driver 121 is preferably a servo motor. The first rotary driver 121 drives the rotating shaft 12 to rotate, and the rotating shaft 12 is driven by the trigger plate 13 to rotate. The rotating frame 11 rotates. In this invention, only three pressing heads 111 are provided. Therefore, the rotating frame 11 stops after rotating 120 degrees each time. After the rotating frame 11 stops rotating, the locking unit 15 first locks the rotating frame 11. Then, the trigger plate 13 disengages from the through groove 112. The worker places the new fiberboard 4 on the support device 3. The lifting frame 21 drives the rotating frame 11 to descend, so that the pressing head 111 at the bottom of the rotating frame 11 contacts the fiberboard 4 and presses the fiberboard 4. This process is repeated.

[0054] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A pressurizing device for testing the toughness of fiberboard, comprising a test assembly (1) capable of pressing a fiberboard (4) and a hydraulic drive unit (2) (153); Its features are, The test assembly (1) includes a rotating frame (11), a rotating shaft (12), a trigger plate (13), a pushing assembly (14), and a locking unit (15). The rotating frame (11) is rotatably positioned below the hydraulic drive unit (2) (153) in the horizontal direction. The rotating frame (11) has a polygonal structure. Each corner of the rotating frame (11) is provided with a pressing head (111). A through slot (112) is provided in the center of the rotating frame (11) in the horizontal direction. The rotating shaft (12) is rotatably disposed in the through groove (112) in the horizontal direction; Multiple trigger plates (13) are evenly arranged around the axis of the rotating shaft (12). The trigger plates (13) can move in the radial direction of the rotating shaft (12) and can contact the inner wall of the through groove (112). The push assembly (14) is mounted on the rotating shaft (12) and is used to drive the trigger plate (13) to move; The locking unit (15) is located on one side of the rotating frame (11) and is used to restrict the rotation of the rotating frame (11). Before the trigger plate (13) contacts the inner wall of the through groove (112), the locking unit (15) locks the rotating frame (11). The hydraulic drive unit (2) (153) includes a lifting frame (21) that moves in a vertical direction, and a rotating frame (11) that is rotatably mounted on the lifting frame (21).

2. The pressure boosting device for testing the toughness of fiberboard according to claim 1, characterized in that, The push assembly (14) includes a groove (141), a first link (142), a second link (143), a push plate (144), and an electric push rod (145). The groove (141) is formed on the side wall of the groove (141) along the length direction of the rotating shaft (12). A sliding groove is formed at one end of the rotating shaft (12) along the axial direction of the rotating shaft (12). The sliding groove is connected to the groove (141). The two ends of the first connecting rod (142) are respectively hinged to one end of the groove (141) and the trigger plate (13); The second link (143) is located on one side of the first link (142), and one end of the second link (143) is hinged to the trigger plate (13); The push plate (144) is moved and disposed in the sliding groove along the extension direction of the sliding groove, and the end of the second connecting rod (143) away from the trigger plate (13) is hinged to the push plate (144); The electric actuator (145) is horizontally positioned on one side of the rotating shaft (12) and is used to drive the push plate (144) to move.

3. The pressure boosting device for testing the toughness of fiberboard according to claim 2, characterized in that, The actuation assembly (14) also includes a first pressure sensor (146), a connecting plate (147), and a ball (148). The first pressure sensor (146) is disposed between the electric push rod (145) and the push plate (144); The connecting plate (147) is fixedly installed at one end of the first pressure sensor (146) facing the push plate (144), and the connecting plate (147) has a circular structure; Multiple balls (148) are evenly arranged on the connecting plate (147) around the axis of the connecting plate (147), and the balls (148) are rotatably arranged on the connecting plate (147).

4. The pressure boosting device for testing the toughness of fiberboard according to claim 1, characterized in that, Friction grooves (131) are provided on the inner wall of the through groove (112) and on the end face of the trigger plate (13) facing the inner wall of the through groove (112).

5. The pressure boosting device for testing the toughness of fiberboard according to claim 1, characterized in that, The locking unit (15) includes a locking slot (151), a locking block (152), and a drive unit (153). The locking groove (151) is horizontally opened at the end of the rotating frame (11); The locking block (152) is horizontally movable and disposed on one side of the locking groove (151) and can engage with the locking groove (151); The drive unit (153) is located on one side of the locking block (152) and is used to drive the locking block (152) to move.

6. The pressure boosting device for testing the toughness of fiberboard according to claim 5, characterized in that, The drive unit (153) includes a second rotary drive (1531), a lead screw (1532), and a moving frame (1533). The second rotary drive (1531) is horizontally mounted on the lifting frame (21); The lead screw (1532) is horizontally fixed on the output end of the second rotary drive (1531); The movable frame (1533) is horizontally movable on the side of the lifting frame (21), the screw (1532) horizontally passes through the movable frame (1533) and is threadedly engaged with the movable frame (1533), and the locking block (152) is horizontally fixed on the movable frame (1533).

7. The pressure boosting device for testing the toughness of fiberboard according to claim 5, characterized in that, A linear actuator (16) is vertically installed above the lifting frame (21), and a straightening column (17) is vertically installed at the end of the linear actuator (16).

8. The pressure boosting device for testing the toughness of fiberboard according to claim 7, characterized in that, A vertical pass-through groove (171) is provided at the lower part of the straightening column (17) for the lead screw (1532) to pass through.

9. The pressure boosting device for testing the toughness of fiberboard according to claim 1, characterized in that, The hydraulic drive unit (2) (153) includes a lifting plate (22) that moves in a vertical direction, and a second pressure sensor (23) is provided between the lifting plate (22) and the lifting frame (21).

10. A fiberboard toughness testing device, characterized in that, The invention includes a pressure boosting device for testing the toughness of fiberboard as described in any one of claims 1-9.

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