A laser measuring device for paperboard production and a method of using the same

Abstract

The application relates to the technical field of paperboard thickness measurement, in particular to a laser measuring device for paperboard production and a using method thereof, which comprises a measuring seat, a fixed measuring table is fixedly installed on the left side of the upper end of the measuring seat, a movable measuring table is arranged on the right side of the fixed measuring table, and a laser measuring device is arranged between the fixed measuring table and the movable measuring table on the rear side of the measuring seat; a straightening mechanism for straightening paperboard is further arranged; when the paperboard is spread, the screw rods on the two sides are rotated to drive the clamping plates to synchronously descend, the two ends of the paperboard are fixed on the fixed measuring table and the movable measuring table, the hydraulic cylinder is started to drive the movable plate, the guide rod, the connecting plate, spring one and the movable measuring table to synchronously move to the right, the fixed measuring table is cooperated with the movable measuring table to straighten the paperboard, the straightening mechanism can avoid the situation that the vertically-unstraightened paperboard after being spread is bent to a certain extent, and the accuracy of the subsequent laser thickness measurement is influenced, so that the thickness measurement accuracy of the paperboard is ensured.

Description

Technical Field

[0001] This invention relates to the field of paperboard thickness measurement technology, and in particular to a laser measuring device for paperboard production and its usage method. Background Technology

[0002] Laser thickness measurement is a non-contact thickness measurement technology that uses laser light to sense distances to an object's surface and converts this distance into an electrical signal. It is primarily used in industrial production lines for real-time monitoring and quality control of materials such as sheets and films. The core principles of laser thickness measurement mainly include laser triangulation and laser time-of-flight methods. In laser triangulation, a laser beam illuminates the surface of the object being measured, and the reflected light is imaged on a photodetector through a lens. The photodetector generates an electrical signal that detects the position of the laser spot on its sensitive surface; the displacement of the laser spot on the detector corresponds to a change in distance from the object's surface. The dual-sensor beam method involves symmetrically installing two laser displacement sensors on the upper and lower sides of the object to measure the distances to the upper and lower surfaces. The actual thickness of the object is obtained by calculating the difference between the fixed distance between the two sensors and the sum of the two measured distances. This method effectively eliminates measurement errors caused by overall vibration or positional fluctuations of the object. The photodetector generates an analog voltage signal based on the laser spot position, which is converted into a digital signal by a data acquisition card, then processed by a computer or dedicated signal processor to obtain and display the thickness information.

[0003] For example, patent application number CN202511675127.8 discloses "a thickness laser measuring device and method for corrugated cardboard packaging box production", which includes a measuring platform and a transport mechanism, which is set inside the measuring platform for transporting the corrugated cardboard to be tested for corrugated cardboard packaging box production, and provides power support for cleaning residual paper scraps on the surface of the corrugated cardboard and flattening the corrugated cardboard during the transport process.

[0004] Although the above-mentioned device flattens the uneven parts of the corrugated cardboard by squeezing the air bladder on the outer wall of the roller 31 into contact with the surface of the corrugated cardboard and generating a certain pressure, if the cardboard bends or curls in the area between multiple roller bladders 31, the squeezing of the air bladder cannot flatten the area between the roller bladders 31, and the cardboard will still bend and curl. The lack of a straightening mechanism affects the accuracy of subsequent laser thickness measurement. Summary of the Invention

[0005] The purpose of this invention is to solve the problem in the prior art that although the air bladder on the outer wall of the roller 31 contacts the surface of the corrugated cardboard and generates a certain pressure to flatten the uneven parts of the corrugated cardboard, if the cardboard bends or curls in the area between the roller 31, the air bladder cannot flatten the area between the roller 31, and the cardboard will still bend and curl. There is no straightening mechanism, which affects the accuracy of subsequent laser thickness measurement. Therefore, this invention proposes a laser measuring device for cardboard production and its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A laser measuring device for cardboard production includes a measuring base, a fixed measuring platform is fixedly installed on the upper left side of the measuring base, a movable measuring platform is provided on the right side of the fixed measuring platform, and an external laser measuring device is provided on the rear side of the measuring base between the fixed measuring platform and the movable measuring platform. A straightening mechanism for straightening the cardboard is also provided. The straightening mechanism includes a connecting plate that is slidably installed on the right end of the movable measuring table. A T-shaped groove is provided on the connecting plate corresponding to the movable measuring table. A guide rod is slidably installed through the lower side of the connecting plate. A movable plate is fixedly installed on the left end of the guide rod. The lower end of the movable plate is slidably installed on the measuring seat. A leveling mechanism is also provided for flattening the cardboard on the fixed measuring platform and the movable measuring platform. The leveling mechanism includes fixed plates symmetrically arranged on the underside of the fixed measuring platform and the movable measuring platform. The upper end of the fixed plates is at the same horizontal line as the inner bottom end of the fixed measuring platform and the movable measuring platform. Movable plates are provided on the upper side of each fixed plate. A rack frame is fixedly installed on the lower end of each fixed plate. The rack frame is slidably installed on the ends of the fixed measuring platform and the movable measuring platform that are far apart from each other. Gear 1 is rotatably installed on the rack frame on both sides of the ends of the fixed measuring platform and the movable measuring platform that are far apart from each other. Gear 1 meshes with the rack frame.

[0007] Preferably, a spring is sleeved on the outer side of the guide rod, and the left and right ends of the spring are fixedly installed on the movable plate and the connecting plate, respectively. A hydraulic cylinder is fixedly installed on the right end of the movable plate, and the hydraulic cylinder is fixedly installed on the measuring seat.

[0008] Preferably, a top plate is fixedly installed at the upper end of the movable plate, and an inclined block is fixedly installed at the lower end of the movable measuring platform, with the inclined block located on the right side of the top plate.

[0009] Preferably, a limiting plate is provided at the connection between the movable measuring platform and the connecting plate, and the limiting plate is fixedly installed on the front end of the movable plate.

[0010] Preferably, clamping plates are slidably installed on the sides of the fixed measuring platform and the movable measuring platform that are close to each other, and screws are rotatably installed on the middle of the upper end of the clamping plates, with the middle part of the screws being threadedly connected to the fixed measuring platform and the movable measuring platform, respectively.

[0011] Preferably, each of the movable stalls has a connecting rod fixedly installed at its upper end. The upper end of each connecting rod is slidably installed on the corresponding rack frame. A second spring is sleeved on the outer side of each connecting rod. The upper and lower ends of the second spring are fixedly connected to the rack frame and the movable stall, respectively. A limit block is slidably installed on the upper end of the rack frame corresponding to the connecting rod. The upper end of the limit block is in contact with the connecting rod.

[0012] Preferably, each of the movable stalls is provided with a pressing bar on its upper side, and a rotating shaft is fixedly installed on one end of each pressing bar, with a gear two fixedly installed in the middle of the rotating shaft.

[0013] Preferably, a fixing plate is rotatably mounted through one side of the rotating shaft, the lower end of the fixing plate is fixedly mounted on the movable stall, and torsion springs are sleeved on the outer side of the rotating shaft.

[0014] Preferably, each of the two gears has a rack plate meshing on one end, and a vertical plate is slidably installed on the other end of each rack plate. The lower end of the vertical plate is installed on the movable plate, and the rack plates on the fixed measuring table and the movable measuring table are symmetrically equipped with protruding strip plates on their respective ends.

[0015] The specific steps for using a laser measuring device for cardboard production are as follows: Step 1: Flatten the cardboard using the set movable and fixed panels; Step 2: Press down in advance on the areas of the cardboard that are bent and warped at a large angle using the set warp-pressing strip; Step 3: Straighten the cardboard using the fixed and movable measuring tables; Step 4: Protect the cardboard during straightening by using a mechanism that allows the movable measuring platform to detach from the fixed measuring platform.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the two ends of the cardboard to be measured are placed on the fixed measuring platform and the movable measuring platform. The limiting block is pushed outward to separate it from the connecting rod. At this time, the spring in the stored state will release the pressure, which will push the movable plate and the connecting rod downward. At this time, the movable plate will cooperate with the fixed plate on the lower side to clamp the cardboard. The rack frame on the front side is pulled outward. The rack frame will drive the fixed plate, the connecting rod and the movable plate connected to it to move synchronously. Under the action of the gear, the rack frame on the other side and the fixed plate, the connecting rod and the movable plate connected to it will move relative to it. At this time, the cardboard is clamped by the movable plate and the fixed plate, so it is easy to flatten the cardboard from the front and rear sides, avoiding the situation where the cardboard has lateral wrinkles, which will affect the error when measuring the thickness by laser, thus improving the accuracy of the cardboard thickness measurement.

[0017] 2. In this invention, when the movable panels on both sides descend and the fixed panel clamps the cardboard and moves away from each other, the fixed panel, rotating shaft, gear two, rack plate, vertical plate, and pressure bar will move synchronously. At this time, the rack plate will descend to the same height as the protrusion of the protrusion plate. When the rack plate moves outward, it will gradually contact the protrusion at the lower end of the protrusion plate and be squeezed by the protrusion at the lower end of the protrusion plate, causing the rack plate to slide downward on the vertical plate. The rack plate drives gear two, rotating shaft, and pressure bar to rotate. The torsion spring will adaptively compress and store force. The intermittent downward rotation of the pressure bar facilitates the intermittent pressing of the movable panel on the cardboard flattening area in advance, avoiding the situation where the cardboard in the movement trajectory area of ​​the movable panel has a large tilting angle, and the movable panel gets stuck at the tilted corner of the cardboard and cannot continue to flatten the cardboard. It also avoids the situation where the tilting angle is too large when the movable panel flattens the cardboard, causing damage to the cardboard. This improves the accuracy of subsequent thickness measurement of the cardboard and ensures the integrity of the cardboard when flattening.

[0018] 3. In this invention, after the cardboard is flattened, rotating the screws on both sides drives the clamping plates to descend synchronously, fixing both ends of the cardboard to the fixed measuring platform and the movable measuring platform. The hydraulic cylinder is activated to drive the movable plate, guide rod, connecting plate, spring 1 and the movable measuring platform to move synchronously to the right, cooperating with the fixed measuring platform to straighten the cardboard. This avoids the cardboard from being not straightened vertically after being flattened, which would cause the cardboard to bend and affect the accuracy of subsequent laser thickness measurement, thus ensuring the accuracy of cardboard thickness measurement.

[0019] 4. In this invention, the guide rod, spring 1, and movable plate facilitate the use of the hydraulic cylinder to drive the movable measuring stage to straighten the cardboard. There is a certain degree of adaptive buffering between the movable measuring stage and the fixed measuring stage, which prevents the hydraulic cylinder from continuing to drive the movable measuring stage after the cardboard is straightened, thus avoiding damage to the cardboard caused by tearing or breaking it. It also prevents the cardboard from being subjected to excessive pulling force, resulting in deformation and affecting the measurement accuracy of the cardboard thickness. This ensures the measurement effect of the cardboard thickness.

[0020] 5. In this invention, when the cardboard is straightened, the movable measuring platform and the connecting plate stop moving. The movable plate drives the guide rod, the top plate, and the limiting plate to continue moving to the right. The spring is adaptively compressed and stores force. The limiting plate separates from the connection between the movable measuring platform and the connecting plate. The top plate gradually approaches and presses the inclined block, causing the inclined block to drive the movable measuring platform to move upward on the T-slot on the connecting plate until the movable measuring platform separates from the connecting plate. This provides a safety mechanism for straightening the cardboard, avoiding the situation where the cardboard lacks buffering and is pulled too hard by the movable and fixed measuring platforms when the hydraulic cylinder straightens the cardboard, resulting in breakage. This ensures that the cardboard can be straightened while preventing damage or breakage caused by the hydraulic cylinder continuously applying tension to the movable measuring platform due to operator error. This saves costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall front three-dimensional structure of the present invention; Figure 2 This is a top-view three-dimensional structural diagram of the present invention; Figure 3 For the present invention Figure 1 Enlarged structural diagram of the movable measuring platform, connecting plate, and the connection point of the movable plate; Figure 4 For the present invention Figure 3 A partially enlarged structural diagram of the connection between the measuring platform and the clamping plate in the middle section; Figure 5 For the present invention Figure 2 A partially enlarged structural diagram of the connection between the fixed measuring platform and the movable platform; Figure 6 For the present invention Figure 5 A partially enlarged structural diagram of the connection between the fixed measuring platform, clamping plate, and pressure bar; Figure 7 For the present invention Figure 3 Schematic diagram of the structure at point A; Figure 8 For the present invention Figure 4 Schematic diagram of the structure at point B; Figure 9 For the present invention Figure 6 Schematic diagram of the structure at point C; Figure 10 For the present invention Figure 6 Schematic diagram of the structure at point D; Figure 11 This is an exploded structural diagram of the movable measuring platform and connecting plate in this invention; Figure 12 This is an exploded view of the movable measuring platform and connecting plate in this invention. In the diagram: 1. Measuring base; 2. Fixed measuring platform; 3. Movable measuring platform; Straightening mechanism: 4. Connecting plate; 5. Guide rod; 6. Movable plate; 7. Spring 1; 8. Hydraulic cylinder; 9. Top plate; 10. Inclined block; 11. Limiting plate; 12. Clamping plate; 13. Screw; Flattening mechanism: 14. Fixed stall; 15. Movable stall; 16. Rack frame; 17. Gear 1; 18. Connecting rod; 19. Limiting block; 20. Spring 2; 21. Pressing bar; 22. Rotating shaft; 23. Gear 2; 24. Fixed plate; 25. Torsion spring; 26. Rack plate; 27. Vertical plate; 28. Protruding strip plate. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Reference Figures 1-12A laser measuring device for cardboard production includes a measuring base 1. A fixed measuring platform 2 is fixedly installed on the upper left side of the measuring base 1, and a movable measuring platform 3 is provided on the right side of the fixed measuring platform 2. An external laser measuring device is provided on the rear side of the measuring base 1 between the fixed measuring platform 2 and the movable measuring platform 3. A straightening mechanism for straightening the cardboard is also provided. The straightening mechanism includes a connecting plate 4 slidably installed on the right end of the movable measuring platform 3. A T-shaped groove is provided on the connecting plate 4 corresponding to the movable measuring platform 3. A guide rod 5 is slidably installed through the lower side of the connecting plate 4. A movable plate 6 is fixedly installed on the left end of the guide rod 5. The lower end of the movable plate 6 is slidably installed on the measuring base 1. A spring 7 is sleeved on the outer side of the guide rod 5. 7. The left and right ends are respectively fixedly installed on the movable plate 6 and the connecting plate 4. The right end of the movable plate 6 is fixedly installed with a hydraulic cylinder 8, which is fixedly installed on the measuring seat 1. The upper end of the movable plate 6 is fixedly installed with a top plate 9, and the lower end of the movable measuring platform 3 is fixedly installed with an inclined block 10, which is located on the right side of the top plate 9. The connection between the movable measuring platform 3 and the connecting plate 4 is fitted with a limiting plate 11, which is fixedly installed on the front end of the movable plate 6. The fixed measuring platform 2 and the movable measuring platform 3 are slidably installed on the side that are close to each other. The upper middle part of the clamping plate 12 is rotatably installed with a screw 13, and the middle part of the screw 13 is threadedly connected to the fixed measuring platform 2 and the movable measuring platform 3 respectively. During operation, after the cardboard is flattened, rotating the screws 13 on both sides causes the clamping plates 12 to descend synchronously, fixing both ends of the cardboard to the fixed measuring platform 2 and the movable measuring platform 3. The hydraulic cylinder 8 is then activated, causing the movable plate 6, guide rod 5, connecting plate 4, spring 7, and movable measuring platform 3 to move synchronously to the right. This works in conjunction with the fixed measuring platform 2 to straighten the cardboard, preventing it from bending vertically after flattening and affecting the accuracy of subsequent laser thickness measurements. This ensures the accuracy of the cardboard thickness measurement. The guide rod 5, spring 7, and movable plate 6 provide adaptive buffering between the movable measuring platform 3 and the fixed measuring platform 2 when the hydraulic cylinder 8 drives the movable measuring platform 3 to straighten the cardboard. This prevents the hydraulic cylinder 8 from continuing to drive the movable measuring platform 3 after the cardboard is straightened, which could damage or break the cardboard. It also prevents excessive pulling force from causing deformation that could affect the accuracy of the cardboard thickness measurement, thus ensuring the accuracy of the cardboard thickness measurement. The cardboard thickness measurement effect is as follows: When the cardboard is straightened, the movable measuring platform 3 and the connecting plate 4 stop moving. The movable plate 6 drives the guide rod 5, the top plate 9, and the limiting plate 11 to continue moving to the right. The spring 7 is adaptively compressed and stores force. The limiting plate 11 separates from the connection between the movable measuring platform 3 and the connecting plate 4. The top plate 9 gradually approaches and squeezes the inclined block 10, causing the inclined block 10 to drive the movable measuring platform 3 to move upward in the T-slot on the connecting plate 4 until the movable measuring platform 3 separates from the connecting plate 4, thus causing the movable measuring platform 3 to detach from the connecting plate 4 and fall. This provides a safety mechanism when the cardboard is straightened, avoiding the situation where the cardboard lacks buffer when the hydraulic cylinder 8 straightens the cardboard, and the pulling force of the movable measuring platform 3 and the fixed measuring platform 2 is too great, resulting in breakage. This ensures that the cardboard can be straightened, while also avoiding the situation where the hydraulic cylinder 8 continuously applies pulling force to the movable measuring platform 3 due to operator error, resulting in damage or breakage of the cardboard. This saves costs.

[0025] As an embodiment of the present invention, a leveling mechanism is also provided for leveling the cardboard on the fixed measuring platform 2 and the movable measuring platform 3. The leveling mechanism includes fixed spreading plates 14 symmetrically arranged on the lower side of the fixed measuring platform 2 and the movable measuring platform 3, with the upper end of the fixed spreading plate 14 being at the same horizontal line as the inner bottom end of the fixed measuring platform 2 and the movable measuring platform 3. Movable spreading plates 15 are provided on the upper side of each fixed spreading plate 14. A rack frame 16 is fixedly installed on the lower end of each fixed spreading plate 14. The rack frame 16 is slidably installed on the ends of the fixed measuring platform 2 and the movable measuring platform 3 that are far apart from each other. Gears 17 are rotatably installed on the rack frames 16 on both sides of the ends of the fixed measuring platform 2 and the movable measuring platform 3 that are far apart from each other. The gears 17 mesh with the rack frames 16. A connecting rod 18 is fixedly installed on the upper end of each movable spreading plate 15. The upper end of the connecting rod 18 is slidably installed through the corresponding rack frame 16. Each side is fitted with a second spring 20, the upper and lower ends of which are fixedly connected to the rack frame 16 and the movable platform 15, respectively. Limit blocks 19 are slidably installed on the upper end of the rack frame 16 corresponding to the connecting rod 18, with the upper ends of the limit blocks 19 abutting against the connecting rod 18. Each movable platform 15 has a pressure bar 21 on its upper side, with a rotating shaft 22 fixedly installed on one end of each pressure bar 21. A gear 23 is fixedly installed in the middle of the rotating shaft 22, and a gear 23 extends through one side of the rotating shaft 22. A fixed plate 24 is rotatably installed, and the lower end of the fixed plate 24 is fixedly installed on the movable platform 15. Torsion springs 25 are sleeved on the outer side of the rotating shaft 22. A rack plate 26 meshes on one end of each gear 23. A vertical plate 27 is slidably installed on the other end of each rack plate 26. The lower end of the vertical plate 27 is installed on the movable platform 15. A protruding strip plate 28 is fixedly installed on the rack plate 26 symmetrically corresponding to the fixed measuring platform 2 and the movable measuring platform 3 at their respective ends. During operation, the cardboard to be measured is placed on the fixed measuring platform 2 and the movable measuring platform 3. The limiting block 19 is pushed outward to separate it from the connecting rod 18. At this time, the spring 20, which is in a charged state, will release pressure, which will push the movable plate 15 and the connecting rod 18 downward. The movable plate 15 will then cooperate with the fixed plate 14 below to clamp the cardboard. Pulling the rack frame 16 outward will cause the fixed plate 14, the connecting rod 18, and the movable plate 15 connected to it to move synchronously. The gear 17 drives the rack frame 16 on the other side, along with the fixed plate 14, connecting rod 18, and movable plate 15, to move relative to it. At this time, the cardboard is held by the movable plate 15 and the fixed plate 14, making it easier to spread flat from both sides. This avoids lateral wrinkles in the cardboard, which could affect laser thickness measurement and cause errors, thus improving the accuracy of cardboard thickness measurement. When the movable plates 15 on both sides descend and the fixed plate 14 clamps the cardboard and moves away from each other... When the device moves, it also drives the fixed plate 24, rotating shaft 22, gear 23, rack plate 26, vertical plate 27, and pressure bar 21 to move synchronously. At this time, the rack plate 26 will descend to the same height as the protrusion of the protrusion plate 28. When the rack plate 26 moves outward, it will gradually contact the protrusion at the lower end of the protrusion plate 28 and be squeezed by the protrusion at the lower end of the protrusion plate 28, causing the rack plate 26 to slide downward on the vertical plate 27. The rack plate 26 drives the gear 23, rotating shaft 22, and pressure bar 21 to rotate, and the torsion spring 25 will automatically... The adaptive compression and storage, along with the intermittent downward rotation of the pressure bar 21, facilitates the intermittent pressing of the movable spreader 15 on the cardboard flattening area in advance. This prevents the cardboard in the movement trajectory area of ​​the movable spreader 15 from tilting at a large angle, causing the movable spreader 15 to get stuck at the tilted corner and unable to continue flattening the cardboard. It also prevents the movable spreader 15 from tilting the cardboard at an excessively large angle, which could damage the cardboard. This improves the accuracy of subsequent thickness measurement of the cardboard and ensures the integrity of the cardboard during flattening.

[0026] The specific steps for using a laser measuring device for cardboard production are as follows: Step 1: Flatten the cardboard using the movable board 15 and the fixed board 14. Step 2: Press down in advance on the area where the cardboard bends and warps at a large angle using the set pressure bar 21; Step 3: Straighten the cardboard using the fixed measuring platform 2 and the movable measuring platform 3; Step 4: Protect the cardboard when it is straightened by using a mechanism that allows the movable measuring platform 3 to detach from the fixed measuring platform 2.

[0027] Working principle: In use, the cardboard to be measured is placed on the fixed measuring platform 2 and the movable measuring platform 3 at both ends. The limiting block 19 is pushed outward to separate it from the connecting rod 18. At this time, the spring 20, which is in a charged state, will release pressure, thereby pushing the movable plate 15 and the connecting rod 18 downward. The movable plate 15 will cooperate with the fixed plate 14 on the lower side to clamp the cardboard. The rack frame 16 on the front side is pulled outward. The rack frame 16 will drive the fixed plate 14, the connecting rod 18 and the movable plate 15 connected to it to move synchronously. Under the action of the gear 17, the rack frame 16 on the other side and the fixed plate 14, the connecting rod 18 and the movable plate 15 connected to it will move relative to it. At this time, the cardboard is moved by the movable plate 15 and the fixed plate 14. The cardboard is clamped in place, making it easy to flatten from both sides, avoiding lateral wrinkles that could affect laser thickness measurement accuracy and improve the accuracy of the cardboard thickness measurement. When the movable plates 15 on both sides descend and clamp the cardboard with the fixed plate 14, moving away from each other, they also drive the fixed plate 24, rotating shaft 22, gear 23, rack plate 26, vertical plate 27, and pressure bar 21 to move synchronously. At this time, the rack plate 26 will descend to the same height as the protrusion of the protrusion plate 28. As the rack plate 26 moves outward, it will gradually contact the protrusion at the lower end of the protrusion plate 28 and be squeezed by the protrusion at the lower end of the protrusion plate 28, causing the rack plate 26 to slide downward on the vertical plate 27. The rack plate 26 drives the gear 23 and rotating shaft 22 to move. As the pressure bar 21 rotates, the torsion spring 25 adaptively compresses and stores force. The intermittent downward rotation of the pressure bar 21 facilitates intermittent pressing of the cardboard flattening area by the movable platform 15 in advance. This prevents the cardboard in the movement trajectory area of ​​the movable platform 15 from tilting at a large angle, thus avoiding the situation where the movable platform 15 gets stuck at the tilted corner of the cardboard and cannot continue to flatten it. It also avoids damage to the cardboard caused by excessive tilting angle during flattening by the movable platform 15. This improves the accuracy of subsequent cardboard thickness measurement and ensures the integrity of the cardboard flattening. After the cardboard is flattened, rotating the screws 13 on both sides drives the clamping plate 12 to descend synchronously, fixing both ends of the cardboard to the fixed measuring platform 2 and the movable measuring platform 3. The hydraulic cylinder 8 is then activated. The movable plate 6, guide rod 5, connecting plate 4, spring 7, and movable measuring stage 3 move synchronously to the right, cooperating with the fixed measuring stage 2 to straighten the cardboard. This prevents the cardboard from being bent vertically after being laid flat, which would affect the accuracy of subsequent laser thickness measurement. The guide rod 5, spring 7, and movable plate 6 provide adaptive buffering between the movable measuring stage 3 and the fixed measuring stage 2 when the hydraulic cylinder 8 drives the movable measuring stage 3 to straighten the cardboard. This prevents the hydraulic cylinder 8 from continuing to drive the movable measuring stage 3 after the cardboard is straightened, which could damage or break the cardboard. It also prevents excessive pulling force from causing deformation that would affect the accuracy of the cardboard thickness measurement.This ensures the accuracy of the cardboard thickness measurement. When the cardboard is straightened, the movable measuring platform 3 and the connecting plate 4 stop moving. The movable plate 6 drives the guide rod 5, the top plate 9, and the limiting plate 11 to continue moving to the right. The spring 7 is adaptively compressed and stores force. The limiting plate 11 separates from the connection between the movable measuring platform 3 and the connecting plate 4. The top plate 9 gradually approaches and presses against the inclined block 10, causing the inclined block 10 to drive the movable measuring platform 3 to move upward in the T-slot on the connecting plate 4 until the movable measuring platform 3 separates from the connecting plate 4. This provides a safety mechanism for straightening the cardboard, preventing the cardboard from breaking due to insufficient buffering and excessive pulling force from the movable measuring platform 3 and the fixed measuring platform 2 when the hydraulic cylinder 8 is straightening it. This ensures that the cardboard can be straightened while preventing damage or breakage caused by the hydraulic cylinder 8 continuously applying pulling force to the movable measuring platform 3 due to operator error. This saves costs.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser measuring device for cardboard production, comprising a measuring base (1), characterized in that, A fixed measuring platform (2) is fixedly installed on the left side of the upper end of the measuring base (1), and a movable measuring platform (3) is provided on the right side of the fixed measuring platform (2). An external laser measuring device is provided on the rear side of the measuring base (1) between the fixed measuring platform (2) and the movable measuring platform (3). A straightening mechanism for straightening the cardboard is also provided. The straightening mechanism includes a connecting plate (4) that is slidably installed on the right end of the movable measuring table (3). A T-shaped groove is provided on the connecting plate (4) corresponding to the movable measuring table (3). A guide rod (5) is slidably installed through the lower side of the connecting plate (4). A movable plate (6) is fixedly installed on the left end of the guide rod (5). The lower end of the movable plate (6) is slidably installed on the measuring seat (1). A slab spreading mechanism is also provided for spreading the cardboard on the fixed measuring platform (2) and the movable measuring platform (3). The slab spreading mechanism includes a fixed spreading plate (14) symmetrically arranged on the lower side of the fixed measuring platform (2) and the movable measuring platform (3). The upper end of the fixed spreading plate (14) is at the same horizontal line as the inner bottom of the fixed measuring platform (2) and the movable measuring platform (3). A movable spreading plate (15) is provided on the upper side of the fixed spreading plate (14). A rack frame (16) is fixedly installed on the lower end of the fixed spreading plate (14). The rack frame (16) is slidably installed on the ends of the fixed measuring platform (2) and the movable measuring platform (3) that are far apart from each other. A gear (17) is rotatably installed on the rack frame (16) on both sides of the ends of the fixed measuring platform (2) and the movable measuring platform (3) that are far apart from each other. The gear (17) meshes with the rack frame (16).

2. The laser measuring device for cardboard production according to claim 1, characterized in that, A spring (7) is sleeved on the outside of the guide rod (5). The left and right ends of the spring (7) are fixedly installed on the movable plate (6) and the connecting plate (4) respectively. A hydraulic cylinder (8) is fixedly installed on the right end of the movable plate (6). The hydraulic cylinder (8) is fixedly installed on the measuring seat (1).

3. The laser measuring device for cardboard production according to claim 1, characterized in that, The upper end of the movable plate (6) is fixedly installed with a top plate (9), and the lower end of the movable measuring platform (3) is fixedly installed with an inclined block (10), which is located on the right side of the top plate (9).

4. The laser measuring device for cardboard production according to claim 1, characterized in that, The movable measuring platform (3) and the connecting plate (4) are fitted together with a limiting plate (11), which is fixedly installed on the front end of the movable plate (6).

5. The laser measuring device for cardboard production according to claim 1, characterized in that, The fixed measuring platform (2) and the movable measuring platform (3) are each slidably mounted on a clamping plate (12) on the side close to each other. The upper middle part of the clamping plate (12) is rotatably mounted with a screw (13), and the middle part of the screw (13) is threadedly connected to the fixed measuring platform (2) and the movable measuring platform (3) respectively.

6. The laser measuring device for cardboard production according to claim 1, characterized in that, Each movable stall (15) is fixedly equipped with a connecting rod (18) at its upper end. The upper ends of the connecting rods (18) are slidably mounted on the corresponding rack frame (16). A second spring (20) is sleeved on the outside of each connecting rod (18). The upper and lower ends of the second spring (20) are fixedly connected to the rack frame (16) and the movable stall (15) respectively. A limit block (19) is slidably installed on the upper end of the rack frame (16) corresponding to the connecting rod (18). The upper ends of the limit blocks (19) are in contact with the connecting rods (18).

7. The laser measuring device for paperboard production according to claim 1, characterized in that, Each of the movable stalls (15) is provided with a pressing bar (21) on the upper side. A rotating shaft (22) is fixedly installed on one end of each pressing bar (21), and a gear (23) is fixedly installed in the middle of the rotating shaft (22).

8. The laser measuring device for cardboard production according to claim 7, characterized in that, A fixing plate (24) is rotatably mounted through one side of the rotating shaft (22). The lower end of the fixing plate (24) is fixedly mounted on the movable stall (15), and torsion springs (25) are sleeved on the outer side of the rotating shaft (22).

9. A laser measuring device for paperboard production according to claim 7, characterized in that, One end of each gear (23) is meshed with a rack plate (26), and the other end of each rack plate (26) is slidably mounted with a vertical plate (27). The lower end of the vertical plate (27) is mounted on the movable platform (15), and the fixed measuring platform (2) and the movable measuring platform (3) are symmetrically mounted with protruding strips (28) on the rack plates (26) that are close to each other.

10. A method of using a laser measuring device for cardboard production according to any one of claims 1-9, characterized in that, The specific steps are as follows: Step 1: Flatten the cardboard using the set movable board (15) and fixed board (14); Step 2: Press down in advance on the area where the cardboard bends and curls up at a large angle using the set pressure bar (21); Step 3: Straighten the cardboard using the fixed measuring table (2) and the movable measuring table (3); Step 4: Protect the cardboard when it is straightened by using a mechanism that allows the movable measuring table (3) to detach from the fixed measuring table (2).

Images