Flatness detection device for corrugated board production

Abstract

The invention relates to the technical field of corrugated board production, and particularly discloses a flatness detection device for corrugated board production, which comprises a detection table, the top of the detection table is provided with a first placement area and a second placement area, the top of the first placement area is provided with a cleaning mechanism, and the top of the second placement area is provided with a thickness detection mechanism. One end of the detection bench is provided with a placing rack, and the top of the placing rack is provided with a flatness detection mechanism. According to the paperboard surface flatness detection device, before the paperboard surface flatness is detected by means of the laser displacement sensor, impurities on the top of a paperboard can be automatically cleaned through the arranged cleaning mechanism, the bottom of the paperboard is automatically cleaned in cooperation with the dust collection head, and subsequent rapid and accurate detection of the laser displacement sensor on the paperboard is facilitated; the situation that part of paperboards are misjudged as unqualified products by the laser displacement sensor is avoided, then the production cost of enterprises is indirectly reduced, and the yield of products is increased.

Description

Technical Field

[0001] This invention relates to the field of corrugated board production technology, and more specifically to a flatness detection device for corrugated board production. Background Technology

[0002] Corrugated cardboard is a multi-layered composite material made of face paper, liner paper, core paper, and corrugated paper with a wave-like shape, bonded together. Compared to other packaging materials, corrugated cardboard is lighter, making it easier to handle and transport. At the same time, its rational structural design allows it to withstand greater pressure and impact, providing reliable protection for packaged goods. Furthermore, the smooth surface of corrugated cardboard is suitable for various printing processes, such as offset printing, flexographic printing, and gravure printing, allowing for the printing of exquisite patterns, text, and trademarks, enhancing the product's packaging quality and market competitiveness.

[0003] After corrugated cardboard is produced and processed, its surface flatness needs to be inspected. This allows for the timely detection of problems that may have occurred during production, such as poor paper quality, poor adhesion, or excessively deep indentations. Appropriate measures can then be taken for adjustment and improvement. This helps reduce the number of defective products, increase the product qualification rate, and lower production costs.

[0004] In existing technologies, the flatness of corrugated cardboard surfaces is typically inspected using high-resolution laser displacement sensors for automatic detection. These sensors precisely measure minute displacement changes, avoiding direct contact with the cardboard surface and eliminating measurement errors caused by contact. This allows for the inspection of large areas of cardboard surfaces in a short time, significantly improving work efficiency. However, during the production and processing of corrugated cardboard, its surface inevitably accumulates oil stains, paper scraps, and residual glue from the bonding process. If corrugated cardboard with such impurities is placed directly under a laser displacement sensor for automatic inspection, the high-precision sensor can easily misjudge it as a defective product. This results in some corrugated cardboard becoming defective after inspection, increasing production costs for enterprises and significantly reducing the yield rate of corrugated cardboard. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a flatness detection device for corrugated cardboard production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A flatness testing device for corrugated cardboard production includes a testing platform. The top of the testing platform is provided with a first placement area and a second placement area. The top of the first placement area is provided with a cleaning mechanism for cleaning the smooth outer wall of the cardboard to be tested. The top of the second placement area is provided with a thickness testing mechanism for testing the thickness of the cardboard to be tested. A placement rack is installed at one end of the testing platform near the thickness testing mechanism. The top of the placement rack is provided with a flatness testing mechanism for testing the flatness of the cardboard surface.

[0007] Optionally, the cleaning mechanism includes two first telescopic cylinders installed at both ends of the testing platform near the first placement area. The telescopic ends of the two first telescopic cylinders at both ends of the testing platform are jointly equipped with a movable frame. The bottom of the movable frame is provided with a first sliding groove, and a first slider is installed inside the first sliding groove.

[0008] Optionally, the bottom end of the first slider is connected to a rectangular plate via a second telescopic cylinder. A second groove is provided at the bottom of the rectangular plate, and a second slider is installed inside the second groove. A movable plate is installed at the bottom end of the second slider.

[0009] Optionally, two first double-ended screws are rotatably installed inside the movable plate, and two first moving blocks are threaded onto the outer walls of the two first double-ended screws. A rotating block is rotatably installed between the two adjacent first moving blocks. A cleaning block is installed on the top of each of the two rotating blocks, and two vacuum suction cups are installed at the bottom of each of the two rotating blocks. A dust suction head is installed on the top of the detection table between the first placement area and the second placement area.

[0010] Optionally, the thickness detection mechanism includes a third slide groove opened on the outer wall of one side of the detection table. A third slider is installed inside the third slide groove. A mounting seat is installed on the top of the end of the third slider away from the third slide groove via two electric push rods. Two rotating blocks are rotatably installed inside the mounting seat. The ends of the two rotating blocks away from the mounting seat are each connected to a mounting bracket via two third telescopic cylinders.

[0011] Optionally, the bottom of the mounting bracket is equipped with four horizontal plates, each of the four horizontal plates has a fourth sliding groove at its bottom, each of the four fourth sliding grooves has a fourth slider installed inside, each of the four fourth sliders has a rotating column rotatably mounted at its bottom end, and each of the four rotating columns has a thickness detection probe and a cone rod installed at its two ends respectively.

[0012] Optionally, the bottom of the mounting bracket is also equipped with four electric telescopic rods, and the telescopic ends of the four electric telescopic rods are jointly equipped with a pressure plate. The inside of the pressure plate is provided with four rectangular slots for the thickness detection probe and the cone rod to move. An atomizing nozzle is installed at the center of the bottom of the pressure plate.

[0013] Optionally, the flatness detection mechanism includes a fixed frame installed on the top of the placement frame, a first groove is provided at the bottom of the fixed frame, a first sliding block is installed inside the first groove, and an installation plate is installed at the bottom end of the first sliding block.

[0014] Optionally, a second double-ended screw is rotatably mounted inside the mounting plate, and two second moving blocks are mounted on the external threads of the second double-ended screw. A laser displacement sensor is mounted on the bottom end of each of the two second moving blocks.

[0015] Optionally, a second groove is provided inside both sides of the placement rack, and a second sliding block is installed inside each of the two second grooves. A U-shaped plate is installed at the end of the two second sliding blocks away from the second groove. A third groove is provided inside both sides of the U-shaped plate, and a third sliding block is installed inside each of the two third grooves. A clamping plate is installed at the end of the two third sliding blocks away from the third groove. A soft pad is installed at the bottom of the clamping plate and the inner bottom surface of the U-shaped plate.

[0016] The beneficial effects of this invention are: 1. In this invention, before using a laser displacement sensor to detect the flatness of the cardboard surface, a cleaning mechanism can be set up to automatically clean impurities on the top of the cardboard, and a vacuum cleaner head can be used to automatically clean the bottom of the cardboard. This facilitates the subsequent rapid and accurate detection of the cardboard by the laser displacement sensor, avoids the laser displacement sensor misjudging some cardboard as unqualified products, and thus indirectly reduces the company's production costs and improves the product yield.

[0017] 2. In this invention, if there are impurities on the surface of the cardboard that cannot be removed, the bottom of the rotating block can be squeezed by the cooperation between the relevant parts of the cleaning mechanism. This causes the part of the cardboard with impurities that cannot be removed to be squeezed into a concave state by the rotating block. The robot arm removes it from the top of the first placement area and stores it together with other defective cardboard. Subsequent workers can quickly identify and classify the cardboard with impurities that cannot be removed from the surface, so that production personnel can optimize the cardboard production process and avoid the cardboard produced later from having impurities attached to the surface that are difficult to remove.

[0018] 3. In this invention, before the laser displacement sensor detects the flatness of the cardboard, the thickness detection mechanism can automatically detect the thickness of the cardboard at different positions in advance. If the values ​​detected by the four thickness detection probes are different, it can be determined that the flatness of the cardboard is unqualified before the flatness detection is performed, thus avoiding the need to re-inspect the cardboard using the flatness detection mechanism and reducing the efficiency of cardboard detection.

[0019] 4. In this invention, when the thickness of the cardboard is determined to be unqualified, the multiple components of the thickness detection mechanism work together to drive the four cone rods to be inserted into the cardboard. Then, the pressure plate and other components are controlled to rotate to a position away from the detection table and in an inclined state. The four electric push rods are controlled to drive the pressure plate to move, which pushes the cardboard fixed by the four cone rods, causing the cardboard to detach from the four cone rods and slide down, thus achieving the effect of automatically rejecting the cardboard that fails the thickness detection. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a flatness detection device for corrugated cardboard production proposed in this invention. Figure 2 This is a schematic diagram of the detection station in this invention; Figure 3 This is a schematic diagram of the structure of the first movable frame and multiple first telescopic cylinders in this invention; Figure 4 This is a cross-sectional view of the rectangular plate in this invention; Figure 5 This is a cross-sectional view of the movable plate in this invention; Figure 6 This is a schematic diagram of the structure of one of the rotating blocks in this invention; Figure 7 This is a schematic diagram of the mounting bracket and pressure plate in this invention; Figure 8 This is a schematic diagram of the structure of the four horizontal plates in this invention; Figure 9 This is a schematic diagram of the structure of one of the fourth sliders, the thickness detection probe, and the cone rod in this invention; Figure 10 This is a schematic diagram of the structure of the four electric telescopic rods and the pressure plate in this invention; Figure 11 for Figure 10 A structural diagram from another angle; Figure 12 This is a schematic diagram of the placement rack and fixing rack in this invention; Figure 13 This is a schematic diagram of the structure at the bottom of the placement rack in this invention; Figure 14 This is a schematic diagram of the structure of the second double-headed screw and the two laser displacement sensors in this invention; Figure 15 This is a schematic diagram of the structure of the U-shaped plate and the clamping plate in this invention.

[0022] In the diagram: 1. Testing table; 2. First placement area; 3. Second placement area; 4. First telescopic cylinder; 5. Moving frame; 6. Rectangular plate; 7. Moving plate; 8. Third slide rail; 9. Third slider; 10. Mounting frame; 11. Placement frame; 12. Fixed frame; 13. Mounting plate; 14. Vacuum head; 15. First slide rail; 16. First slider; 17. Second telescopic cylinder; 18. Second slide rail; 19. Second slider; 20. First double-ended screw; 21. First moving block; 22. Rotating block; 23. Vacuum suction cup; 24. Cleaning block; 25. Mounting base; 26. Third telescopic cylinder; 27. Pressure plate; 28. Horizontal plate; 29. ​​Fourth slide groove; 30. Thickness detection probe; 31. Fourth slider; 32. Conical rod; 33. Electric telescopic rod; 34. Rectangular groove; 35. Atomizing nozzle; 36. Second groove; 37. U-shaped plate; 38. First groove; 39. Second double-ended screw; 40. Laser displacement sensor; 41. First sliding block; 42. Second sliding block; 43. Third groove; 44. Third sliding block; 45. Clamping plate. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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] Reference Figures 1-15 A flatness testing device for corrugated cardboard production includes a testing platform 1. The top of the testing platform 1 is provided with a first placement area 2 and a second placement area 3. The top of the first placement area 2 is provided with a cleaning mechanism for cleaning the smooth outer wall of the cardboard to be tested. The top of the second placement area 3 is provided with a thickness testing mechanism for testing the thickness of the cardboard to be tested. A placement rack 11 is installed at one end of the testing platform 1 near the thickness testing mechanism. The top of the placement rack 11 is provided with a flatness testing mechanism for testing the flatness of the cardboard surface.

[0025] As an optimized technical solution of the present invention, the cleaning mechanism includes two first telescopic cylinders 4 installed at both ends of the testing platform 1 near the first placement area 2. A movable frame 5 is mounted on the telescopic ends of the two first telescopic cylinders 4 at both ends of the testing platform 1. A first sliding groove 15 is provided at the bottom of the movable frame 5, and a first slider 16 is installed inside the first sliding groove 15. During the telescopic process, the telescopic ends of the multiple first telescopic cylinders 4 can drive the movable frame 5 to move up and down above the first placement area 2 for adjustment. A first linear motor is pre-installed inside the first sliding groove 15, and the first linear motor can drive the first slider 16 to move back and forth inside the first sliding groove 15.

[0026] As a technical optimization of the present invention, the bottom end of the first slider 16 is connected to a rectangular plate 6 via a second telescopic cylinder 17. A second sliding groove 18 is provided at the bottom of the rectangular plate 6, and a second slider 19 is installed inside the second sliding groove 18. A movable plate 7 is installed at the bottom end of the second slider 19. During the telescopic process, the telescopic end of the second telescopic cylinder 17 can drive the rectangular plate 6 and the movable plate 7 to move up and down together for adjustment. A second linear motor is preset inside the second sliding groove 18. The second linear motor can drive the second slider 19 to move back and forth inside the second sliding groove 18, thereby driving the movable plate 7 to move back and forth at the bottom of the rectangular plate 6.

[0027] As a technical optimization of the present invention, two first double-headed screws 20 are rotatably installed inside the movable plate 7. Two first moving blocks 21 are threadedly installed on the outer walls of the two first double-headed screws 20. A rotating block 22 is rotatably installed between the two adjacent first moving blocks 21. A cleaning block 24 is installed on the top of each of the two rotating blocks 22. Two vacuum suction cups 23 are installed at the bottom of each of the two rotating blocks 22. A dust suction head 14 is installed on the top of the detection table 1 between the first placement area 2 and the second placement area 3. Two first driving devices are pre-installed on one side of the outer wall of the movable plate 7. The output ends of the two first driving devices are respectively connected to one end of the two first double-headed screws 20, thereby driving the two first double-headed screws 20 to rotate inside the movable plate 7, and consequently driving the two first moving blocks 21 on its outer wall to move towards or away from each other. A second driving device is pre-installed inside each of the two first moving blocks 21. The output ends of the two second driving devices are respectively connected to the rotating parts of one end of the two rotating blocks 22, thereby driving the two rotating blocks 22 to rotate between the corresponding two first moving blocks 21. The interior of the two rotating blocks 22 is hollow, and can be connected to the external infusion device through two hoses during actual use, so as to deliver the relevant liquid into the interior of the two rotating blocks 22 and be adsorbed by the two cleaning blocks 24. The two vacuum suction cups 23 are connected to the pre-installed vacuum device through pipes, so that the vacuum suction cups 23 can adsorb the smooth side of the cardboard during use.

[0028] As a technical optimization of the present invention, the thickness detection mechanism includes a third slide groove 8 formed on the outer wall of one side of the detection table 1. A third slider 9 is installed inside the third slide groove 8. A mounting base 25 is mounted on the top of the end of the third slider 9 away from the third slide groove 8 via two electric push rods. Two rotating blocks are rotatably mounted inside the mounting base 25. The ends of the two rotating blocks away from the mounting base 25 are each connected to a mounting frame 10 via two third telescopic cylinders 26. A third linear motor is preset inside the third slide groove 8. The third linear motor can drive the third slider 9 to move back and forth inside the third slide groove 8, thereby causing the mounting base 25 and the mounting frame 10 to move back and forth together above the second placement area 3.

[0029] As a technical optimization of the present invention, four horizontal plates 28 are installed at the bottom of the mounting frame 10. Each of the four horizontal plates 28 has a fourth sliding groove 29 at its bottom. A fourth slider 31 is installed inside each of the four fourth sliding grooves 29. A rotating column is rotatably mounted at the bottom end of each of the four fourth sliders 31. A thickness detection probe 30 and a cone rod 32 are respectively installed at both ends of the four rotating columns. A fourth linear motor is pre-installed inside each of the four fourth sliding grooves 29, which can drive the four fourth sliders 31 to move back and forth within their respective fourth sliding grooves 29. A third driving device is pre-installed on one side of the outer wall of each of the four fourth sliders 31. The output end of the third driving device is connected to the rotating part at one end of the rotating column, thereby enabling the rotating column and the thickness detection probes 30 and cone rods 32 at both ends to rotate and adjust.

[0030] As a technical optimization of the present invention, four electric telescopic rods 33 are also installed at the bottom of the mounting frame 10. A pressure plate 27 is installed at the telescopic ends of the four electric telescopic rods 33. The pressure plate 27 has four rectangular slots 34 inside for the thickness detection probes 30 and the conical rods 32 to move. An atomizing nozzle 35 is installed at the center of the bottom of the pressure plate 27. During the telescopic process, the telescopic ends of the four electric telescopic rods 33 can move and adjust the pressure plate 27 at the bottom of the mounting frame 10. The atomizing nozzle 35 can be connected to an externally pre-set atomizing device via a connecting pipe, allowing the atomized water to be discharged downwards from the nozzle 35.

[0031] As a technical optimization of the present invention, the flatness detection mechanism includes a fixed frame 12 installed on the top of the placement frame 11. The bottom of the fixed frame 12 has a first groove 38, and a first sliding block 41 is installed inside the first groove 38. A mounting plate 13 is installed at the bottom end of the first sliding block 41. A fifth linear motor is preset inside the first groove 38. The fifth linear motor can drive the first sliding block 41 to move back and forth inside the first groove 38, thereby driving the mounting plate 13 at the bottom to move and adjust together.

[0032] As a technical optimization of the present invention, a second double-ended screw 39 is rotatably mounted inside the mounting plate 13. Two second moving blocks are threaded onto the external surface of the second double-ended screw 39, and laser displacement sensors 40 are mounted at the bottom ends of both second moving blocks. A fourth driving device is pre-installed on one side of the outer wall of the mounting plate 13. The output end of the fourth driving device is connected to one end of the second double-ended screw 39, thereby driving the second double-ended screw 39 to rotate inside the mounting plate 13, causing the two second moving blocks and the laser displacement sensors 40 to move and adjust in a direction closer to or further apart. The laser displacement sensor 40 is a Panasonic HG-C series laser displacement sensor, which can be used for high-precision thickness measurement and unevenness distance control, and is suitable for the flatness detection of cardboard. As a technical optimization of the present invention, a second groove 36 is provided inside both sides of the placement rack 11. A second sliding block 42 is installed inside each of the two second grooves 36. A U-shaped plate 37 is installed at the end of each of the two second sliding blocks 42 away from the second groove 36. A third groove 43 is provided inside both sides of the U-shaped plate. A third sliding block 44 is installed inside each of the two third grooves 43. A clamping plate 45 is installed at the end of each of the two third sliding blocks 44 away from the third groove 43. A soft pad is installed on the bottom of the clamping plate 45 and the inner bottom surface of the U-shaped plate 37. A sixth linear motor is preset inside each of the two second grooves 36. The two sixth linear motors can drive the two second sliding blocks 42 to move back and forth inside the corresponding second groove 36, thereby driving the U-shaped plate 37 to move back and forth inside the placement rack 11 for adjustment. A seventh linear motor is preset inside each of the two third grooves 43. The two seventh linear motors can drive the two third sliding blocks 44 to move up and down inside the corresponding third groove 43, thereby driving the clamping plate 45 to move up and down inside the U-shaped plate 37 for adjustment.

[0033] In this invention, when using the device, the user places the cardboard to be tested in a stack near the first placement area 2, ensuring that the smooth side of each cardboard faces upwards. Then, using the first slider 16, the device moves towards the stacked cardboard inside the first groove 15 until the moving plate 7 reaches the top of the cardboard. At this point, the telescopic end of the second telescopic cylinder 17 extends downwards, causing the rectangular plate 6 and the moving plate 7 to move downwards together. This allows the two sets of vacuum suction cups 23 located at the bottom of the moving plate 7 to contact the smooth surface of the topmost cardboard, facilitating proper alignment of the cardboard with the vacuum suction cups 23. Adsorption occurs when the first slider 16 moves and resets inside the first slide groove 15, thereby moving the adsorbed cardboard above the first placement area 2. This releases the adsorption of the cardboard by the two sets of vacuum suction cups 23, causing the cardboard to fall onto the top of the first placement area 2. The cardboard surface is then identified and detected by a visual inspection device pre-set above the first placement area 2. If the cardboard has obvious damage or wrinkles, it can be automatically removed by a robotic arm pre-set near the first placement area 2, avoiding further processing and inspection that could affect the overall inspection efficiency of the cardboard.

[0034] If the visual inspection equipment only detects oil and glue residue adhering to the surface of the cardboard during processing, the two rotating blocks 22 can be controlled to rotate 180 degrees between the corresponding two first moving blocks 21. This causes the side of the two rotating blocks 22 with the cleaning blocks 24 mounted to rotate to the bottom, so that the two cleaning blocks 24 come into contact with the top of the cardboard. The externally pre-installed infusion device delivers the relevant cleaning agent to the interior of the two rotating blocks 22, where it is temporarily absorbed and stored by the two cleaning blocks 24. As the two first double-headed screws 20 drive the two first moving blocks 21 on their outer walls to move towards each other or away from each other, the two rotating blocks 22 and the cleaning blocks 24 at their bottom move back and forth on the top of the cardboard, cleaning the oil and glue residue adhering to the top of the cardboard. With the help of the second slider 19 moving back and forth inside the second slide groove 18 and the first slider 16 moving and adjusting inside the first slide groove 15, the two cleaning blocks 24 can thoroughly clean and remove the impurities adhering to the top of the cardboard, facilitating subsequent inspection of the cardboard.

[0035] If the cardboard still has impurities that cannot be removed after the top smooth surface has been cleaned, the two rotating blocks 22 can be controlled to rotate downwards by 90 degrees between the corresponding two first moving blocks 21 to a vertical position. With the rotation of the two first double-headed screws 20, the movement of the first slider 16 and the movement of the second slider 19, the rotating blocks 22 are moved to move directly above the impurities that cannot be removed. With the downward extension of the telescopic end of the second telescopic cylinder 17, the bottom end of the rotating blocks 22 is squeezed against the cardboard, so that the part of the cardboard with impurities that cannot be removed is squeezed into a concave state by the rotating blocks 22. The robot arm removes it from the top of the first placement area 2 and stores it together with other defective cardboard. Afterwards, the staff can quickly identify and classify the cardboard with impurities that cannot be removed from the surface, so that the production staff can optimize the cardboard production process and avoid the cardboard produced later having impurities attached to the surface that are difficult to remove.

[0036] If the smooth surface of the cardboard top is cleaned and passes the visual inspection, the two rotating blocks 22 can be adjusted between the corresponding two first moving blocks 21 to rotate the two vacuum suction cups 23 to the bottom. The extension end of the second telescopic cylinder 17 then extends, allowing the vacuum suction cups 23 to re-adhere to the smooth surface of the cardboard top, maintaining the bottom of the cardboard abutting against the top of the inspection table 1. The extension ends of multiple first telescopic cylinders 4 extend simultaneously, moving the moving frame 5 upwards to a specified height. The extension ends of the second telescopic cylinders 17 then extend adaptively, maintaining the cardboard abutting against the top of the inspection table 1. Finally, the two rotating blocks... The mounting base 25 rotates upward 90 degrees, causing the two third telescopic cylinders 26, the mounting bracket 10, the four horizontal plates 28, and the pressure plate 27 to rotate upward together into a vertical state. Then, the first slider 16 is controlled to move inside the first slide groove 15 towards the direction of the second placement area 3, thereby moving the cardboard from the first placement area 2 to the top of the second placement area 3. During the movement of the cardboard on the top of the vacuum head 14, the impurities attached to the bottom of the cardboard can be automatically sucked away and cleaned by the vacuum head 14, avoiding the situation where the cardboard carries the impurities attached to the bottom of the second placement area 3 to the top of the second placement area 3 after moving to the top of the second placement area 3, thus preventing the second placement area 3 from being contaminated.

[0037] If the cardboard placed on top of the second placement area 3 is free from deformation and has good overall flatness, the two rotating blocks can be directly controlled to rotate downwards and reset, causing multiple components such as the mounting frame 10 to rotate to the top of the cardboard. The third slider 9 is controlled to move and adjust the mounting frame 10 and other components at the top of the second placement area 3 within the third slide groove 8, ensuring that the mounting frame 10 and other components are directly above the cardboard. Based on the positions of the four corners of the cardboard, the four fourth sliders 31 are controlled to move and adjust within the corresponding fourth slide grooves 29, causing multiple thickness detection probes 30 to move to the position directly above the four corners of the cardboard. This activates the externally preset thickness detector and controls the two electric push rods. The telescopic ends retract together, causing the four thickness detection probes 30 to abut against the four corners of the cardboard, thus automatically detecting the thickness of the cardboard at the four corners simultaneously. If the thicknesses of the four corners of the cardboard are different, the four fourth sliders 31 can be further controlled to move towards each other within the corresponding fourth slide grooves 29, allowing the four thickness detection probes 30 to further detect the thickness at different locations of the cardboard. If the values ​​detected by the four thickness detection probes 30 are still different, it can be determined that the flatness of the cardboard is unqualified before the flatness test, avoiding the need for further testing of the cardboard by the flatness testing mechanism and reducing the efficiency of cardboard testing.

[0038] When the thickness of the cardboard is determined to be unqualified, the four rotating columns can be controlled to rotate 180 degrees together, driving the four cone rods 32 to rotate to the bottom of the fourth slider 31. At this time, the telescopic ends of the two electric push rods are controlled to retract, so that the four cone rods 32 can be inserted into the cardboard together. The two rotating blocks are controlled to rotate more than 180 degrees inside the mounting base 25, driving the pressure plate 27 and other components to rotate to a position away from the detection table 1 and in an inclined state. At this time, the cardboard is inserted and fixed above the pressure plate 27 by the four cone rods 32. The telescopic ends of the four electric push rods are controlled to extend together, driving the pressure plate 27 to move upward, which can push the cardboard fixed by the four cone rods 32, so that the cardboard separates from the four cone rods 32 and slides down, achieving the effect of automatically rejecting cardboard with unqualified thickness. At the same time, the cardboard that fails the thickness test will have four holes caused by the insertion of the 32 cone rods. This allows subsequent staff to quickly identify the reason for the cardboard's failure based on the four holes on the cardboard surface, which is beneficial for subsequent production staff to improve the cardboard production process and reduce the production of cardboard with unqualified thickness.

[0039] If, after thickness testing, the cardboard only shows thickness variations at the edges, the four rotating columns can be controlled to rotate 180 degrees simultaneously. This causes the four cone rods 32 to rotate to their bottom positions, allowing the four fourth sliders 31 to move and adjust within their corresponding fourth grooves 29. This moves the four cone rods 32 directly above the areas with varying cardboard thicknesses. The telescopic ends of the two electric push rods then retract simultaneously, causing the four cone rods 32 to insert the cardboard into the areas with different thicknesses. After the four cone rods 32 have inserted the cardboard, the telescopic ends of the two electric push rods extend simultaneously, moving the inserted cardboard upwards a short distance. Then, the... Four electric telescopic rods 33 drive the pressure plate 27 downward, pushing the cardboard down to the top of the second placement area 3. Then, the telescopic ends of the four electric telescopic rods 33 are extended together, causing the pressure plate 27 to come into contact with the cardboard. The telescopic ends of the two third telescopic cylinders 26 are extended together, which can drive the cardboard pressed at the bottom of the pressure plate 27 back to the top of the first placement area 2. The laser cutting equipment set at the top of the first placement area 2 can determine the position of different thicknesses of the cardboard edge according to the holes marked by the four cone rods 32 on the top of the cardboard, and quickly cut the parts of the cardboard edge with different thicknesses. After cutting the cardboard, the above steps of pushing the cardboard to the top of the second placement area 3 with the help of the relevant components of the cleaning mechanism are repeated, so that the cardboard returns to the top of the second placement area 3. After the pressure plate 27 presses and fixes it, the third slider 9 moves in the third groove 8 towards the placement rack 11, which can drive the processed cardboard into the part between the clamping plate 45 and the U-shaped plate 37. After the clamping plate 45 clamps and fixes one end of the cardboard, as the two second sliding blocks 42 move in the corresponding second groove 36 away from the detection table 1, the clamped cardboard is moved to the top of the placement rack 11. With the first sliding block 41 at the top of the placement rack 11 moving back and forth in the first groove 38 and the second double-headed screw 39 driving the two laser displacement sensors 40 to move back and forth at the bottom of the mounting plate 13, the flatness of the cardboard surface is comprehensively identified and detected.

[0040] If the cardboard at the top of the second placement area 3 is deformed, the two rotating blocks can be rotated downwards to reset, causing the mounting bracket 10 and other components to rotate downwards to reset to the top of the second placement area 3. Then, the telescopic ends of the four electric telescopic rods 33 can be extended to press the cardboard lightly with the pressure plate 27 for a period of time. If the deformation of the cardboard cannot be removed after the light pressing with the pressure plate 27, the telescopic ends of the four electric telescopic rods 33 can be retracted to move the pressure plate 27 upwards above the cardboard. The externally preset atomizing device can be started, and the third slider 9 can be moved back and forth inside the third slide groove 8 to drive the atomizing nozzle 35 to evenly discharge the atomized water onto the surface of the cardboard for humidification. Then, the cardboard can be lightly pressed again with the pressure plate 27 for a period of time to observe whether the deformation of the cardboard has improved. After the deformation of the cardboard is removed by pressing, the cardboard can be pushed into the top of the placement rack 11 directly with the cooperation of the pressure plate 27 and the third slider 9. The flatness of the cardboard is then detected by two laser displacement sensors 40. If the deformation of the cardboard is still not removed, the third slider 9 can be moved back and forth inside the third slide groove 8 while the pressure plate 27 is pressing the cardboard. The extension and retraction ends of the two third telescopic cylinders 26 can also be repeatedly extended and retracted. This will cause the pressure plate 27 to press and shape the cardboard in both the horizontal and vertical directions. If the flatness of the cardboard passes the test, subsequent production personnel can also use this method to process the deformed cardboard to avoid waste. If the flatness of the cardboard fails the test, such deformed cardboard can be directly classified as unqualified products without the need for further testing.

[0041] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flatness testing device for corrugated cardboard production, comprising a testing table (1), characterized in that, The top of the testing station (1) is provided with a first placement area (2) and a second placement area (3). The top of the first placement area (2) is provided with a cleaning mechanism for cleaning the smooth outer wall of the cardboard to be tested. The top of the second placement area (3) is provided with a thickness detection mechanism for detecting the thickness of the cardboard to be tested. A placement rack (11) is installed at one end of the testing station (1) near the thickness detection mechanism. The top of the placement rack (11) is provided with a flatness detection mechanism for detecting the flatness of the cardboard surface.

2. The flatness detection device for corrugated cardboard production according to claim 1, characterized in that, The cleaning mechanism includes two first telescopic cylinders (4) installed at both ends of the testing platform (1) near the first placement area (2). The telescopic ends of the two first telescopic cylinders (4) at both ends of the testing platform (1) are jointly equipped with a moving frame (5). A first sliding groove (15) is opened at the bottom of the moving frame (5). A first slider (16) is installed inside the first sliding groove (15).

3. The flatness detection device for corrugated cardboard production according to claim 2, characterized in that, The bottom end of the first slider (16) is connected to a rectangular plate (6) via a second telescopic cylinder (17). A second groove (18) is provided at the bottom of the rectangular plate (6). A second slider (19) is installed inside the second groove (18). A movable plate (7) is installed at the bottom end of the second slider (19).

4. The flatness detection device for corrugated cardboard production according to claim 3, characterized in that, The movable plate (7) has two first double-headed screws (20) rotatably installed inside. The outer walls of the two first double-headed screws (20) are threaded with two first moving blocks (21). A rotating block (22) is rotatably installed between the two adjacent first moving blocks (21). A cleaning block (24) is installed on the top of each of the two rotating blocks (22). Two vacuum suction cups (23) are installed at the bottom of each of the two rotating blocks (22). A dust suction head (14) is installed on the top of the detection table (1) between the first placement area (2) and the second placement area (3).

5. The flatness detection device for corrugated cardboard production according to claim 1, characterized in that, The thickness detection mechanism includes a third slide groove (8) opened on the outer wall of one side of the detection table (1). A third slider (9) is installed inside the third slide groove (8). A mounting seat (25) is installed on the top of the end of the third slider (9) away from the third slide groove (8) through two electric push rods. Two rotating blocks are rotatably installed inside the mounting seat (25). The ends of the two rotating blocks away from the mounting seat (25) are connected to the mounting bracket (10) through two third telescopic cylinders (26).

6. The flatness detection device for corrugated cardboard production according to claim 5, characterized in that, The mounting bracket (10) has four horizontal plates (28) installed at the bottom. Each of the four horizontal plates (28) has a fourth sliding groove (29) at the bottom. Each of the four fourth sliding grooves (29) has a fourth slider (31) installed inside. Each of the four fourth sliders (31) has a rotating column installed at the bottom. Each of the four rotating columns has a thickness detection probe (30) and a cone rod (32) installed at both ends.

7. The flatness detection device for corrugated cardboard production according to claim 6, characterized in that, The bottom of the mounting bracket (10) is also equipped with four electric telescopic rods (33). The telescopic ends of the four electric telescopic rods (33) are all equipped with a pressure plate (27). The inside of the pressure plate (27) is provided with four rectangular slots (34) for the thickness detection probe (30) and the cone rod (32) to move. The bottom of the pressure plate (27) is equipped with an atomizing nozzle (35).

8. The flatness detection device for corrugated cardboard production according to claim 1, characterized in that, The flatness testing mechanism includes a fixed frame (12) installed on the top of the placement frame (11). A first groove (38) is provided at the bottom of the fixed frame (12). A first sliding block (41) is installed inside the first groove (38). An installation plate (13) is installed at the bottom of the first sliding block (41).

9. A flatness detection device for corrugated cardboard production according to claim 8, characterized in that, The mounting plate (13) is internally mounted with a second double-ended screw (39), and the external threads of the second double-ended screw (39) are fitted with two second moving blocks, and the bottom ends of the two second moving blocks are fitted with laser displacement sensors (40).

10. A flatness detection device for corrugated cardboard production according to claim 9, characterized in that, The placement rack (11) has a second groove (36) on both sides inside. A second sliding block (42) is installed inside each of the two second grooves (36). A U-shaped plate (37) is installed at the end of the two second sliding blocks (42) away from the second groove (36). A third groove (43) is opened inside both sides of the U-shaped plate. A third sliding block (44) is installed inside each of the two third grooves (43). A clamping plate (45) is installed at the end of the two third sliding blocks (44) away from the third groove (43). A soft pad is installed at the bottom of the clamping plate (45) and the inner bottom surface of the U-shaped plate (37).

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