Thickness laser measuring device and method for corrugated paper packaging box production

Abstract

The invention discloses a thickness laser measuring device for corrugated paper packaging box production and a method thereof, and relates to the technical field of laser thickness measuring devices. The concave-convex part of the corrugated board can be extruded through rolling of an air bag of the measurement pretreatment mechanism, flattening is achieved, meanwhile, high-speed airflow generated by an air cylinder purges paper scraps on the surface through air inlet and outlet holes, suction force generated when a piston is reset subsequently can suck the residual paper scraps into a detachable dust collection cylinder, the paper scraps are prevented from blocking a laser light path, and measurement errors are reduced from the source; secondly, in the laser thickness measuring mechanism, a first laser thickness measuring assembly and a second laser thickness measuring assembly move in opposite directions and are matched with the movement of the paperboard along with the conveying belt, measuring point positions in a larger range on the surface of the paperboard can be covered, the contingency of single-point measurement is avoided, a touch switch of a laser thickness gauge can be triggered and starts to work only after the preprocessing mechanism completes the purging action, and the accuracy of measurement is improved. The problem that paper scraps raised during purging interfere with a light path is thoroughly avoided, and the data validity is further guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser thickness measuring devices, in particular to a thickness laser measuring device for corrugated paper packaging box production and a method thereof. BACKGROUND

[0002] The thickness of corrugated paperboard is directly related to its compressive strength, cushioning performance and stiffness, which are key indicators for protecting the contents of the packaging box. If the thickness does not meet the standard, the packaging box will be easily deformed and damaged, and cannot withstand the squeezing and collision during transportation, thereby causing damage to the contents. Therefore, the thickness of the corrugated paperboard needs to be measured regularly in the production line to detect problems such as uneven feeding of raw paper and abnormal corrugation formation, and to quickly adjust equipment parameters to avoid producing unqualified products in batches and improve production stability and yield.

[0003] Referring to the thickness detection device for a corrugated paperboard production line disclosed in the patent application with publication number CN215766911U, the light receiver includes a plurality of receiving areas, each receiving area corresponds to a light emitter, and different receiving areas correspond to different rollers, which can determine the position of the thickness of the corrugated paperboard.

[0004] The above-mentioned thickness detection device for a corrugated paperboard production line in the prior art has the following defects in actual use: Traditional laser thickness measuring devices mostly use single-point laser sensors, which can only measure a single position on the surface of the corrugated paperboard. Moreover, due to the shaking and deviation of the corrugated paperboard during transportation, false thickness change signals are generated, and single-point measurement is easily affected by local concave-convex on the surface of the corrugated paperboard, which cannot accurately reflect the overall thickness. When the laser spot falls on the convex position of the corrugated paperboard, the measured value will deviate significantly from the true thickness. Secondly, the residual paper scraps in the cutting process of the corrugated paperboard are easily attached to the surface of the corrugated paperboard, which changes the height of the laser beam falling point in the laser thickness measuring device due to the attachment of the residual paper scraps at the local position of the corrugated paperboard, easily causing false judgment of the laser thickness measuring device, and thus leading to inaccurate thickness measurement results. For example, the above-mentioned prior art, the thickness detection device indirectly changes the height position of the roller by relying on the thickness change of the surface of the corrugated paperboard, thereby changing the position of the light emitter, and the roller is easily affected by the residual paper scraps on the surface of the corrugated paperboard during measurement, which constantly shakes and affects the final measurement results. Moreover, the position of the corrugated paperboard corresponding to the roller is always fixed, so that the corresponding light emitter can only measure the thickness of the paperboard at a single position, and multiple rollers and laser emitters need to be set to measure the thickness values at multiple positions, which certainly increases the manufacturing cost of the equipment.

[0005] Therefore, the present application proposes a thickness laser measuring device for corrugated paper packaging box production and a method thereof to solve the above-mentioned problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a thickness laser measuring device and method for corrugated cardboard packaging box production. It solves the problems of traditional laser thickness measuring devices, which mostly use single-point laser sensors, capable of measuring only a single location on the corrugated cardboard surface. Furthermore, due to the vibration and shifting of the corrugated cardboard during transport, false thickness change signals are generated. Single-point measurements are easily affected by local unevenness on the corrugated cardboard surface, failing to accurately reflect the overall thickness. When the laser spot falls on a protruding corrugated area, the measured value deviates significantly from the true thickness. Secondly, residual paper scraps from the corrugated cardboard cutting process easily adhere to the surface, causing localized changes in the laser beam's landing point height in the thickness measuring device, easily leading to misjudgments and inaccurate thickness measurement results.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a thickness laser measuring device for corrugated cardboard packaging box production, comprising a measuring platform, and further comprising: The transport mechanism, located inside the measuring platform, is used to transport the corrugated cardboard used in the production of corrugated cardboard packaging boxes to be tested, 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; Multiple measurement pretreatment mechanisms are evenly arranged above the conveying mechanism. The conveying mechanism uses a power roller to flatten the corrugated cardboard that is about to be measured for thickness. At the same time, a high-speed blowing airflow is output to the top of the corrugated cardboard to blow away residual paper dust attached to the surface of the corrugated cardboard, thus removing interference items for subsequent thickness measurement of the corrugated cardboard. The laser thickness measurement mechanism is located at the top of the inner cavity of the measuring stage. The position of the thickness laser measurement is continuously changed by the upward or downward movement of multiple measurement pre-processing mechanisms, so as to obtain the thickness information of multiple points on the surface of the corrugated cardboard in a non-contact measurement manner. The measurement result display component is fixedly installed on one side of the top of the measuring platform. It is used to display the thickness data of the corrugated cardboard measured by the laser thickness measuring mechanism, and to analyze and judge multiple thickness data to determine the final thickness data of the corrugated cardboard.

[0008] Furthermore, the conveying mechanism includes two belt rollers arranged opposite each other, and a conveyor belt is fitted on the outer wall of the two belt rollers. A support plate for lifting the conveyor belt is also fixedly installed on the inner wall of the measuring platform and inside the conveyor belt to cooperate with the laser thickness measuring mechanism to flatten the surface of the corrugated cardboard. Pulleys are fixedly installed at both ends of the two belt rollers, and a drive belt is fitted on the outer wall of two adjacent pulleys. Multiple drive components are evenly arranged on the outer wall of the drive belt.

[0009] Furthermore, the drive assembly includes a limiting plate fixed to the outer wall of the transmission belt by bolts. A wheel frame is also fixed to the outer wall of the limiting plate, and a guide wheel is rotatably arranged inside the wheel frame. Guide grooves are provided at relative positions on both sides of the inner wall of the measuring table. The position and structure of the limiting plate are adapted to the guide grooves.

[0010] Furthermore, the measurement pretreatment mechanism includes a roller cylinder and an air bladder fixedly sleeved on the surface of the roller cylinder. One end of the air bladder is provided with an inflation / deflation nozzle. By controlling the amount of air in the air bladder within a certain range, the initial distance between the bottom of the outer wall of the air bladder and the top of the transport mechanism can be changed. The surface of the roller cylinder is uniformly provided with multiple inlet and outlet holes. Dust collection components for collecting shredded paper are provided on both sides of the inside of the roller cylinder. Air delivery cylinders are provided on both sides of the roller cylinder. A connecting flange is fixedly sleeved on the outer wall of the air delivery cylinder. The roller cylinder and the air delivery cylinder are detachably connected through the connecting flange. A first hanger and a second hanger are rotatably sleeved on both sides of the outer wall of the air delivery cylinder, respectively. The second hanger and the first hanger are fixedly connected through a connecting member.

[0011] Furthermore, a piston plate is fixedly installed at the bottom of the first hanger, and a pressure plate is fixedly installed at the bottom of the second hanger. One end of the pressure plate is provided with a slope surface. After climbing up the slope surface to the top of the pressure plate, there is a flat area. An air cylinder is fixedly installed on the inner wall of the measuring platform and below the piston plate. The piston plate is sealed and slidably installed inside the air cylinder. A return spring is fixedly installed between the bottom of the piston plate and the air cylinder. The air cylinder and the air delivery cylinder are connected by a hose for feeding gas from the air cylinder into the roller cylinder through the air delivery cylinder.

[0012] Furthermore, the dust collection assembly includes a dust collection cylinder detachably disposed inside the roller cylinder. A filter plate is detachably disposed at one end of the dust collection cylinder near the air delivery cylinder, and a conical hopper is fixedly disposed at the other end of the dust collection cylinder. Multiple filter holes are evenly distributed on the outer wall of the conical hopper. Multiple dust inlet holes are also evenly distributed on the outer wall of the dust collection cylinder. Each dust inlet hole is connected to one of the air inlet and outlet holes. An auxiliary conical hopper is fixedly disposed inside each dust inlet hole. Paper scraps can also enter the dust collection cylinder through the auxiliary conical hopper. The shape and structure of the conical hopper and the auxiliary conical hopper can ensure that paper scraps can smoothly enter the dust collection cylinder through the conical hopper without affecting the normal airflow. Paper scraps cannot escape from the dust collection cylinder.

[0013] Furthermore, the laser thickness measuring mechanism includes a first side plate and a second side plate arranged opposite to each other. The front and rear sides of the opposite side walls of the first side plate and the second side plate are jointly provided with a second laser thickness measuring component and a first laser thickness measuring component, which are used to perform multi-point thickness laser measurement of corrugated cardboard. The second laser thickness measuring component and the first laser thickness measuring component are driven by a first drive rack and a second drive rack, respectively. The bottom end of the first drive rack and the transmission rod are jointly fixed with a long connecting rod.

[0014] Furthermore, the first laser thickness measuring component and the second laser thickness measuring component have the same structure. The first laser thickness measuring component includes a guide rod fixedly installed on the opposite side walls of the first side plate and the second side plate. A bidirectional screw is also rotatably installed on the opposite side walls of the first side plate and the second side plate. The first laser thickness gauge and the second laser thickness gauge are respectively sleeved on both sides of the outer wall of the guide rod and the bidirectional screw. One end of the bidirectional screw rotatably passes through the first side plate and is fixedly installed with a gear.

[0015] Furthermore, the top of both the first and second laser thickness gauges is fixedly equipped with a first touch switch and a second trigger switch for controlling their respective operation. The top sides of the inner cavity of the measuring stage are respectively fixedly equipped with a first trigger block and a second trigger block that are adapted to the positions of the first touch switch and the second trigger switch. After the first and second laser thickness gauges move a preset distance from their initial positions that are close to each other to their positions that are far apart, the first trigger block and the second trigger block meet the first touch switch and the second trigger switch respectively and complete the triggering, and the first and second laser thickness gauges start to work.

[0016] This invention also discloses a laser thickness measurement method for corrugated cardboard packaging box production, which is used in a laser thickness measurement device for corrugated cardboard packaging box production. The method includes the following steps: Step 1: First, place one end of the corrugated cardboard used for corrugated cardboard packaging box production, which has already been cut, in the middle position at the top of the conveyor mechanism. As the conveyor mechanism operates, the corrugated cardboard will be completely driven into the measuring table. Step 2: The transport mechanism simultaneously pulls multiple measuring pretreatment mechanisms downwards by a preset distance, so that the distance between the bottom of the outer wall of the measuring pretreatment mechanism and the top of the transport mechanism is slightly less than the thickness of the corrugated cardboard. At the same time, the measuring pretreatment mechanism is driven to rotate by the friction between the corrugated cardboard and the measuring pretreatment mechanism. The gas generated when the measuring pretreatment mechanism moves downwards is blown onto the surface of the corrugated cardboard to peel off the remaining paper scraps. Step 3: Driven by the measurement pretreatment mechanism, the laser thickness measuring mechanism continuously changes the thickness measurement position during the movement of the corrugated cardboard to obtain the thickness values ​​at multiple points on the surface of the corrugated cardboard.

[0017] This invention provides a thickness laser measuring device and method for corrugated cardboard packaging box production. Compared with the prior art, it has the following advantages: 1. A thickness laser measuring device and method for corrugated cardboard packaging box production, comprising a pre-treatment mechanism with an airbag roller to press and flatten the corrugated cardboard's uneven parts, while a high-speed airflow generated by an air cylinder blows away surface paper scraps through inlet and outlet holes. The suction force during piston reset further draws residual paper scraps into a detachable dust collection cylinder, preventing paper scraps from obstructing the laser path and reducing measurement errors at the source. Secondly, in the laser thickness measuring mechanism, the first and second laser thickness measuring components move in opposite directions. Specifically, the first and second laser thickness gauges in the first component gradually move away from each other, while the first and second laser thickness gauges in the second component gradually move closer together. Combined with the movement of the cardboard along the conveyor belt, this covers a wider range of measurement points on the cardboard surface, avoiding the randomness of single-point measurements. The laser thickness gauge's touch switch is only triggered and activated after the pre-treatment mechanism completes the blowing action, completely eliminating the problem of paper scraps interfering with the optical path during blowing and further ensuring data validity.

[0018] 2. A thickness laser measuring device and method for corrugated cardboard packaging box production, which, through the linkage design of the conveyor mechanism and the measurement pretreatment mechanism, enables the conveyor belt of the conveyor mechanism to automatically transport cardboard, and its drive component can synchronously drive the measurement pretreatment mechanism to move downward. There is no need to set a separate power source for the pretreatment mechanism, realizing the continuous action of conveying, flattening and blowing without manual adjustment. Moreover, the movement of the laser thickness gauge is driven by the thickness pretreatment mechanism through the linkage of long connecting rod and rack, without the need for manual adjustment of the thickness measurement position. After the measurement data is wirelessly transmitted to the display component, the system automatically removes abnormal data and calculates the average value, directly outputting the final result, saving the steps of manual screening and calculation, and greatly improving the thickness measurement efficiency.

[0019] 3. A thickness laser measuring device and method for corrugated cardboard packaging box production, which features an adjustable initial distance design for the airbag, allowing the air volume of the airbag in the pretreatment mechanism to be controlled by the inflation / deflation nozzle. For every 10 cubic centimeters of air inflated into the airbag, the distance between its bottom and the top of the conveyor mechanism decreases by 1 millimeter. The minimum air volume of the airbag ensures rigidity, while the maximum air volume prevents it from bursting. This design can accurately adapt to corrugated cardboard of different thicknesses, thereby improving practicality. Secondly, the conveyor belt rollers of the conveyor mechanism are connected to the drive motor, allowing for flexible adjustment of the conveyor belt speed according to the cardboard thickness and measurement requirements. This avoids insufficient pretreatment due to excessively fast conveying or reduced efficiency due to excessively slow conveying.

[0020] 4. A thickness laser measuring device and method for corrugated cardboard packaging box production, featuring a detachable dust collection cylinder and a separately detachable filter plate at its end, facilitating the cleaning of collected paper scraps. Furthermore, the roller pressing cylinder and air supply cylinder are detachably connected via a connecting flange, eliminating the need to disassemble the entire structure for subsequent maintenance or replacement of the roller pressing assembly, thus reducing replacement costs. Secondly, the power source of the conveying mechanism is not only used to transport the cardboard but also to drive the pre-treatment measuring mechanism downwards and the laser thickness measuring mechanism to move, reducing the number of independent power sources, lowering equipment size and reducing the probability of failure, and facilitating efficient thickness measurement of corrugated cardboard.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first overall three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 A magnified structural diagram of part A in the diagram; Figure 3 This is a schematic diagram of the second overall three-dimensional structure of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention with the measuring stage removed; Figure 5 This is a schematic diagram of the transport mechanism structure of the present invention; Figure 6 This is a schematic diagram of the decomposed state structure of the measurement pretreatment mechanism of the present invention; Figure 7 For the present invention Figure 6 A magnified structural diagram of part B in the diagram; Figure 8 This is a schematic diagram of the first cross-sectional structure of the measurement pretreatment mechanism of the present invention; Figure 9 This is a schematic diagram of the second cross-sectional structure of the measurement pretreatment mechanism of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of part C in the diagram; Figure 11 This is a schematic diagram of the laser thickness measurement mechanism of the present invention.

[0023] In the diagram: 1. Measuring platform; 2. Transport mechanism; 21. Belt roller; 22. Conveyor belt; 23. Pallet; 24. Pulley; 25. Transmission belt; 26. Drive assembly; 261. Limiting plate; 262. Wheel frame; 263. Guide wheel; 3. Measurement pretreatment mechanism; 31. Roller cylinder; 32. Inlet and outlet ports; 33. Dust collection assembly; 331. Dust collection cylinder; 332. Dust inlet port; 333. Filter plate; 334. Conical hopper; 34. Connecting flange; 35. Air delivery cylinder; 36. First hanger; 37. Piston plate; 38. Second hanger; 39. Pressure plate; 310. Connecting component; 311. Air cylinder; 312. Return spring; 313. Hose; 4. Laser thickness measuring mechanism; 41. First side plate; 42. Second side plate; 43. First laser thickness measuring assembly; 431. Guide rod; 432. Bidirectional screw; 433. First laser thickness gauge; 434. Second laser thickness gauge; 435. Gear; 44. Second laser thickness measuring assembly; 45. First drive rack; 46. Second drive rack; 47. Transmission rod; 5. Measurement result display assembly; 6. Guide groove; 7. Long connecting rod. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention provides four technical solutions: a thickness laser measuring device for corrugated cardboard packaging box production, specifically including the following embodiments: like Figures 1-4 The first embodiment is shown: a thickness laser measuring device for corrugated cardboard packaging box production, including a measuring stage 1, and further comprising: The transport mechanism 2 is located inside the measuring table 1. It is used to transport the corrugated cardboard used in the production of corrugated cardboard packaging boxes to be tested, and to provide power support for cleaning the paper scraps remaining on the surface of the corrugated cardboard and flattening the corrugated cardboard during the transport process. Multiple measurement pretreatment units 3 are evenly arranged above the conveying mechanism 2. The conveying mechanism 2 uses a power roller to flatten the corrugated cardboard that is about to be tested for thickness. At the same time, a high-speed blowing airflow is output to the top of the corrugated cardboard to blow away the residual paper scraps attached to the surface of the corrugated cardboard, thus removing interference items for subsequent thickness measurement of the corrugated cardboard. The laser thickness measuring mechanism 4 is set at the top of the inner cavity of the measuring stage 1. The position of the thickness laser measurement is continuously changed by the upward or downward movement of multiple measurement pre-processing mechanisms 3, so as to obtain the thickness information of multiple points on the surface of the corrugated cardboard in a non-contact measurement manner. The measurement result display component 5 is fixedly installed on the top side of the measuring platform 1. It is used to display the thickness data of the corrugated paperboard measured by the laser thickness measuring mechanism 4, and to analyze and judge multiple thickness data to determine the final thickness data of the corrugated paperboard.

[0026] like Figure 5 The second embodiment is shown, differing from the first in that: the conveying mechanism 2 includes two belt rollers 21 arranged opposite each other, with a conveyor belt 22 mounted on the outer walls of both belt rollers 21. A support plate 23 for lifting the conveyor belt 22 is fixedly mounted on the inner wall of the measuring platform 1, inside the conveyor belt 22, to cooperate with the laser thickness measuring mechanism 4 in flattening the surface of the corrugated cardboard. Pulleys 24 are fixedly mounted at both ends of the two belt rollers 21, and a drive belt 25 is mounted on the outer walls of two adjacent pulleys 24. Multiple drive components 26 are evenly arranged on the outer wall of the drive belt 25. One end of one belt roller 21 is connected to the output shaft of a drive motor, allowing for flexible adjustment of the belt roller 21's rotational speed according to measurement requirements.

[0027] In this embodiment, the drive assembly 26 includes a limiting plate 261 fixed to the outer wall of the transmission belt 25 by bolts. A wheel frame is also fixedly mounted on the outer wall of the limiting plate 261, and a guide wheel 263 is rotatably mounted inside the wheel frame. Guide grooves 6 are provided at relative positions on both sides of the inner wall of the measuring table 1. The position and structure of the limiting plate 261 are adapted to the guide grooves 6. When the limiting plate 261 encounters the guide groove 6 during movement, it can slide into the interior of the guide groove 6 to restrict the movement posture of the limiting plate 261. When the guide wheel 263 encounters the pressure plate 39, it can climb up the slope at one end to the horizontal area. When the guide wheel 263 climbs up the slope of the pressure plate 39, it can press down the second hanger 38 to drive the roller cylinder 31 and piston plate 37 to move downward.

[0028] like Figures 6-10The third embodiment is shown, which differs from the second embodiment in that: the measuring pretreatment mechanism 3 includes a roller cylinder 31 and an air bladder fixedly sleeved on the surface of the roller cylinder 31. One end of the air bladder is provided with an inflation / deflation nozzle. By controlling the amount of air in the air bladder within a certain range, the initial distance between the bottom of the outer wall of the air bladder and the top of the transport mechanism 2 can be changed. The surface of the roller cylinder 31 is evenly provided with multiple air inlet and outlet holes 32. Dust collection components 33 for collecting shredded paper are provided on both sides of the inside of the roller cylinder 31. Air delivery cylinders 35 are provided on both sides of the roller cylinder 31. A connecting flange 34 is fixedly sleeved on the outer wall of the air delivery cylinder 35. The roller cylinder 31 and the air delivery cylinder 35 are detachably connected through the connecting flange 34. A first hanger 36 and a second hanger 38 are rotatably sleeved on both sides of the outer wall of the air delivery cylinder 35, respectively. The second hanger 38 and the first hanger 36 are fixedly connected through a connecting member 310. The minimum air volume in the airbag is always sufficient to ensure that the airbag is fully inflated and has a certain degree of rigidity. The maximum inflation volume is based on the premise that the airbag will not burst. Furthermore, based on the initial air volume, for every 10 cubic centimeters of air added to the airbag, the distance between the bottom of the outer wall and the top of the carrier mechanism 2 decreases by 1 millimeter after the airbag expands. Also, at the initial air volume, the distance between the bottom of the outer wall of the airbag and the top of the carrier mechanism 2 is a fixed value.

[0029] In this embodiment, a piston plate 37 is fixedly installed at the bottom end of the first hanger 36, and a pressure plate 39 is fixedly installed at the bottom end of the second hanger 38. One end of the pressure plate 39 is provided with a slope surface. After climbing up the slope surface to the top of the pressure plate 39, there is a flat area. An air cylinder 311 is fixedly installed on the inner wall of the measuring platform 1 and below the piston plate 37. The piston plate 37 is sealed and slidably installed inside the air cylinder 311. A return spring 312 is fixedly installed between the bottom of the piston plate 37 and the air cylinder 311. The air cylinder 311 and the air delivery cylinder 35 are connected by a hose 313 for inputting the gas in the air cylinder 311 into the roller cylinder 31 through the air delivery cylinder 35.

[0030] In this embodiment, the dust collection assembly 33 includes a dust collection cylinder 331 detachably disposed inside the roller cylinder 31. A filter plate 333 is detachably disposed at one end of the dust collection cylinder 331 near the air delivery cylinder 35, and a conical hopper 334 is fixedly disposed at the other end of the dust collection cylinder 331. Multiple filter holes are evenly opened on the outer wall of the conical hopper 334, and multiple dust inlet holes 332 are also evenly opened on the outer wall of the dust collection cylinder 331. Each dust inlet hole 332 is connected to one of the air inlet and outlet holes 32, and an auxiliary conical hopper is fixedly disposed inside each dust inlet hole 332. Paper scraps can also enter the dust collection cylinder 331 through the auxiliary conical hopper. The shape and structure of the conical hopper 334 and the auxiliary conical hopper can ensure that paper scraps can smoothly enter the dust collection cylinder 331 through the conical hopper 334 without affecting the normal flow of airflow, and paper scraps cannot escape from the dust collection cylinder 331.

[0031] like Figure 11 A fourth embodiment is shown, differing from the third embodiment in that the laser thickness measuring mechanism 4 includes a first side plate 41 and a second side plate 42 arranged opposite each other. A second laser thickness measuring component 44 and a first laser thickness measuring component 43 are jointly arranged on the front and rear sides of the opposite sidewalls of the first side plate 41 and the second side plate 42, for performing multi-point laser thickness measurement of the corrugated cardboard. The second laser thickness measuring component 44 and the first laser thickness measuring component 43 are driven by a first drive rack 45 and a second drive rack 46, respectively. A long connecting rod 7 is fixedly arranged at the bottom end of the first drive rack 45 and the transmission rod 47. The bottom of the long connecting rod 7 is also fixedly arranged on the top of the first hanger 36 in the multiple measurement pre-processing mechanisms 3. Initially, the first laser thickness gauge 433 and the second laser thickness gauge 434 in the second laser thickness measuring component 44 are in a state of distance from each other, while initially, the first laser thickness gauge 433 and the second laser thickness gauge 434 in the first laser thickness measuring component 43 are in a state of closeness to each other.

[0032] In this embodiment, the first laser thickness measuring component 43 and the second laser thickness measuring component 44 have the same structure. The first laser thickness measuring component 43 includes a guide rod 431 fixedly mounted on the opposite sidewalls of the first side plate 41 and the second side plate 42. A bidirectional screw 432 is also rotatably mounted on the opposite sidewalls of the first side plate 41 and the second side plate 42. The first laser thickness gauge 433 and the second laser thickness gauge 434 are respectively sleeved on both sides of the outer wall of the guide rod 431 and the bidirectional screw 432. One end of the bidirectional screw 432 rotatably passes through the first side plate 41 and is fixedly mounted with a gear 435. The outer wall of the bidirectional screw 432 is symmetrically provided with threaded grooves with opposite directions of rotation on both sides. The first laser thickness gauge 433 and the second laser thickness gauge 434 are symmetrically arranged on both sides of the outer wall of the bidirectional screw 432. The gear 435 in the first laser thickness measuring component 43 and the second laser thickness measuring component 44 are respectively meshed with the transmission rod 47 and the first drive rack 45.

[0033] In this embodiment, the top of the first laser thickness gauge 433 and the second laser thickness gauge 434 are fixedly provided with a first touch switch and a second trigger switch for controlling their respective operation. The top sides of the inner cavity of the measuring stage 1 are respectively fixedly provided with a first trigger block and a second trigger block that are adapted to the positions of the first touch switch and the second trigger switch. After the first laser thickness gauge 433 and the second laser thickness gauge 434 move a preset distance from their initial positions that are close to each other to their positions that are far apart from each other, the first trigger block and the second trigger block meet the first touch switch and the second trigger switch respectively and complete the triggering. The first laser thickness gauge 433 and the second laser thickness gauge 434 start to work. The positions of the No. 1 touch switch and the No. 2 trigger switch, as well as the No. 1 trigger block and the No. 2 trigger block, are misaligned so that when the measuring pretreatment mechanism 3 moves downward and blows gas onto the corrugated cardboard, the first laser thickness gauge 433 and the second laser thickness gauge 434 do not work. When the blowing action is completed, the No. 1 trigger block and the No. 2 trigger block in the first laser thickness gauge 433 and the second laser thickness gauge 434 meet the No. 1 touch switch and the No. 2 trigger switch respectively and complete the triggering, thus avoiding interference from the newly blown paper scraps with the laser beam path of the first laser thickness gauge 433 and the second laser thickness gauge 434.

[0034] This invention also provides a laser thickness measurement method for corrugated cardboard packaging box production, and a laser thickness measurement device for corrugated cardboard packaging box production. The method includes the following steps: Step 1: First, place one end of the corrugated cardboard used for corrugated cardboard packaging box production, which has already been cut, in the middle position at the top of the conveyor mechanism 2. As the conveyor mechanism 2 operates, the corrugated cardboard will be completely driven into the measuring table 1. Step 2: The conveying mechanism 2 simultaneously pulls multiple measuring pretreatment mechanisms 3 downwards by a preset distance, so that the distance between the bottom of the outer wall of the measuring pretreatment mechanism 3 and the top of the conveying mechanism 2 is slightly less than the thickness of the corrugated cardboard. At the same time, the measuring pretreatment mechanism 3 is driven to rotate by the friction between the corrugated cardboard and the measuring pretreatment mechanism 3. The gas generated when the measuring pretreatment mechanism 3 moves downwards is blown onto the surface of the corrugated cardboard to peel off the remaining paper scraps. Step 3: Driven by the pre-treatment mechanism 3, the laser thickness measuring mechanism 4 continuously changes the thickness measuring position during the movement of the corrugated cardboard to obtain the thickness values ​​at multiple points on the surface of the corrugated cardboard.

[0035] The specific process is as follows: First, the cut corrugated cardboard is placed at the top center of the conveyor belt 22. As the conveyor belt 22 moves, the corrugated cardboard gradually enters the interior of the measuring table 1.

[0036] Since the number of multiple drive components 26 is the same as the number of pressure plates 39, and their positions are set in a one-to-one correspondence, when one of the limiting plates 261 enters the guide groove 6 and continues to slide along its inner wall, the guide wheel 263 approaches and meets the adjacent pressure plate 39. The guide wheel 263 climbs up the slope surface at one end of the pressure plate 39 to the flat area. When the guide wheel 263 is in the flat area at the top of the pressure plate 39, the roller cylinder 31 is always in contact with the top of the corrugated cardboard, maintaining pressure on the corrugated cardboard. At the same time, the others... Multiple pressure plates 39 at their respective positions are simultaneously driven downwards by guide wheels 263 at their corresponding positions. The pressure plates 39, using the second hanger 38 and connecting piece 310, pull the roller cylinder 31 and piston plate 37 downwards synchronously. This causes the air bladder on the outer wall of the roller cylinder 31 to contact the surface of the corrugated cardboard, generating pressure that flattens the uneven areas of the cardboard. Meanwhile, as the piston plate 37 moves downwards, it compresses the air inside the air cylinder 311. The air is then introduced into the air delivery cylinder 35 through the hose 313 and enters the air delivery cylinder 35. The paper scraps are drawn into the roller cylinder 31 and ultimately blown onto the surface of the corrugated cardboard through multiple air inlets and outlets 32 on the surface of the roller cylinder 31. The paper scraps adhering to the surface of the corrugated cardboard are blown away. When the guide roller 263 and the corresponding pressure plate 39 disengage, the piston plate 37 is reset under the elastic force of the return spring 312. The suction force generated by the upward movement of the piston plate 37 draws some of the external air back into the air cylinder 311 through the multiple air inlets and outlets 32, while the paper scraps peeled off from the surface of the corrugated cardboard are blown away through the air inlets and outlets 32. The paper scraps are drawn into the roller cylinder 31 and move towards both ends of the roller cylinder 31 with the airflow. The paper scraps are carried by the airflow through the conical hopper 334 into the dust collection cylinder 331. When the piston plate 37 squeezes the air in the air cylinder 311 again, the paper scraps that have entered the dust collection cylinder 331 cannot be discharged because the outlet of the conical hopper 334 is a small pointed cone. This serves to collect the scattered paper scraps and prevent the scattered paper scraps from interfering with the beam paths of the first laser thickness gauge 433 and the second laser thickness gauge 434, thereby improving the measurement accuracy.

[0037] As the height of multiple pre-treatment measuring mechanisms 3 decreases, the first drive rack 45 and transmission rod 47 are simultaneously connected to the tops of multiple first hangers 36 via the long connecting rod 7. Therefore, the first drive rack 45 and transmission rod 47 can synchronously measure the downward movement of the pre-treatment mechanism 3. The first drive rack 45 and transmission rod 47 simultaneously drive the gear 435 at the corresponding position to rotate. When the bidirectional screw 432 in the first laser thickness measuring assembly 43 rotates, the first laser thickness gauge 433 and the second laser thickness gauge 434 move away from each other and continuously generate laser beams during the movement to measure the thickness of the corrugated cardboard. During the measurement, the corrugated cardboard is constantly moving, allowing the first laser thickness gauge 433 and the second laser thickness gauge 434 to measure the thickness of the corrugated cardboard over a wider range. At the same time, the first laser thickness gauge 433 and the second laser thickness gauge 434 in the second laser thickness measuring assembly 44 gradually move closer to each other from a state of being far apart, just in the opposite direction to the movement of the first laser thickness gauge 433 and the second laser thickness gauge 434 in the first laser thickness measuring assembly 43. This allows the second laser thickness measuring assembly 44 and the first laser thickness measuring assembly 43 to cooperate with each other to complete the multi-point thickness detection of the corrugated cardboard.

[0038] The thickness data measured by the first laser thickness gauge 433 and the second laser thickness gauge 434 are transmitted wirelessly to the measurement result display component 5. Through data integration and analysis, thickness data that differs significantly from the actual thickness data are eliminated, and then the average value of the corrugated cardboard thickness data is calculated.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thickness laser measuring device for corrugated cardboard packaging box production, comprising a measuring stage, characterized in that, Also includes: The transport mechanism, located inside the measuring platform, is used to transport the corrugated cardboard used in the production of corrugated cardboard packaging boxes to be tested, 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; Multiple measurement pretreatment mechanisms are evenly arranged above the conveying mechanism. The conveying mechanism uses a power roller to flatten the corrugated cardboard that is about to be measured for thickness. At the same time, a high-speed blowing airflow is output to the top of the corrugated cardboard to blow away residual paper dust attached to the surface of the corrugated cardboard, thus removing interference items for subsequent thickness measurement of the corrugated cardboard. The laser thickness measurement mechanism is located at the top of the inner cavity of the measuring stage. The position of the thickness laser measurement is continuously changed by the upward or downward movement of multiple measurement pre-processing mechanisms, so as to obtain the thickness information of multiple points on the surface of the corrugated cardboard in a non-contact measurement manner. The measurement result display component is fixedly installed on one side of the top of the measuring platform. It is used to display the thickness data of the corrugated cardboard measured by the laser thickness measuring mechanism, and to analyze and judge multiple thickness data to determine the final thickness data of the corrugated cardboard.

2. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 1, characterized in that: The conveying mechanism includes two belt rollers arranged opposite each other, and a conveyor belt is fitted on the outer wall of the two belt rollers. A support plate for lifting the conveyor belt is also fixedly installed on the inner wall of the measuring platform and inside the conveyor belt to cooperate with the laser thickness measuring mechanism to flatten the surface of the corrugated cardboard. Pulleys are fixedly installed at both ends of the two belt rollers, and a drive belt is fitted on the outer wall of two adjacent pulleys. Multiple drive components are evenly arranged on the outer wall of the drive belt.

3. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 2, characterized in that: The drive assembly includes a limiting plate fixed to the outer wall of the transmission belt by bolts. A wheel frame is also fixed to the outer wall of the limiting plate. A guide wheel is rotatably arranged inside the wheel frame. Guide grooves are opened at relative positions on both sides of the inner wall of the measuring table. The position and structure of the limiting plate are adapted to the guide grooves.

4. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 1, characterized in that: The measurement pretreatment mechanism includes a roller cylinder and an air bladder fixedly sleeved on the surface of the roller cylinder. One end of the air bladder is provided with an inflation / deflation nozzle. By controlling the amount of air in the air bladder within a certain range, the initial distance between the bottom of the outer wall of the air bladder and the top of the transport mechanism can be changed. The surface of the roller cylinder is evenly provided with multiple inlet and outlet holes. Dust collection components for collecting shredded paper are provided on both sides of the inside of the roller cylinder. Air delivery cylinders are provided on both sides of the roller cylinder. Connecting flanges are fixedly sleeved on the outer wall of the air delivery cylinders. The roller cylinder and the air delivery cylinders are detachably connected through the connecting flanges. A first hanger and a second hanger are rotatably sleeved on both sides of the outer wall of the air delivery cylinders, respectively. The second hanger and the first hanger are fixedly connected through a connecting member.

5. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 4, characterized in that: A piston plate is fixedly installed at the bottom of the first hanger, and a pressure plate is fixedly installed at the bottom of the second hanger. One end of the pressure plate is provided with a slope surface. After climbing up the slope surface to the top of the pressure plate, there is a flat area. An air cylinder is fixedly installed on the inner wall of the measuring platform and below the piston plate. The piston plate is sealed and slidably installed inside the air cylinder. A return spring is fixedly installed between the bottom of the piston plate and the air cylinder. The air cylinder and the air delivery cylinder are connected by a hose for feeding gas from the air cylinder into the roller cylinder through the air delivery cylinder.

6. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 4, characterized in that: The dust collection assembly includes a dust collection cylinder detachably installed inside the roller cylinder. A filter plate is detachably installed at one end of the dust collection cylinder near the air delivery cylinder, and a conical hopper is fixedly installed at the other end of the dust collection cylinder. Multiple filter holes are evenly opened on the outer wall of the conical hopper. Multiple dust inlet holes are also evenly opened on the outer wall of the dust collection cylinder. Each dust inlet hole is connected to one of the air inlet and outlet holes. An auxiliary conical hopper is fixedly installed inside each dust inlet hole. Paper scraps can also enter the dust collection cylinder through the auxiliary conical hopper. The shape and structure of the conical hopper and the auxiliary conical hopper can ensure that paper scraps can smoothly enter the dust collection cylinder through the conical hopper without affecting the normal airflow. Paper scraps cannot escape from the dust collection cylinder.

7. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 1, characterized in that: The laser thickness measuring mechanism includes a first side plate and a second side plate arranged opposite to each other. A second laser thickness measuring component and a first laser thickness measuring component are jointly arranged on the front and rear sides of the opposite side walls of the first side plate and the second side plate, which are used to perform multi-point thickness laser measurement of corrugated cardboard. The second laser thickness measuring component and the first laser thickness measuring component are driven by a first drive rack and a second drive rack, respectively. A long connecting rod is fixedly arranged at the bottom end of the first drive rack and the transmission rod.

8. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 7, characterized in that: The first laser thickness measuring component and the second laser thickness measuring component have the same structure. The first laser thickness measuring component includes a guide rod fixedly installed on the opposite side wall of the first side plate and the second side plate. A bidirectional screw is also rotatably installed on the opposite side wall of the first side plate and the second side plate. The first laser thickness gauge and the second laser thickness gauge are respectively sleeved on both sides of the outer wall of the guide rod and the bidirectional screw. One end of the bidirectional screw rotatably passes through the first side plate and is fixedly installed with a gear.

9. The thickness laser measuring device for corrugated cardboard packaging box production according to claim 8, characterized in that: The top of both the first and second laser thickness gauges is fixedly equipped with a first touch switch and a second trigger switch for controlling their respective operation. The top sides of the inner cavity of the measuring stage are respectively fixedly equipped with a first trigger block and a second trigger block that are adapted to the positions of the first touch switch and the second trigger switch. After the first and second laser thickness gauges move a preset distance from their initial positions that are close to each other to their positions that are far apart, the first trigger block and the second trigger block meet the first touch switch and the second trigger switch respectively and complete the triggering, and the first and second laser thickness gauges start to work.

10. A laser thickness measurement method for corrugated cardboard packaging box production, characterized in that: The method for using the thickness laser measuring device for corrugated cardboard packaging box production as described in any one of claims 1-9 includes the following steps: Step 1: First, place one end of the corrugated cardboard used for corrugated cardboard packaging box production, which has already been cut, in the middle position at the top of the conveyor mechanism. As the conveyor mechanism operates, the corrugated cardboard will be completely driven into the measuring table. Step 2: The transport mechanism simultaneously pulls multiple measuring pretreatment mechanisms downwards by a preset distance, so that the distance between the bottom of the outer wall of the measuring pretreatment mechanism and the top of the transport mechanism is slightly less than the thickness of the corrugated cardboard. At the same time, the measuring pretreatment mechanism is driven to rotate by the friction between the corrugated cardboard and the measuring pretreatment mechanism. The gas generated when the measuring pretreatment mechanism moves downwards is blown onto the surface of the corrugated cardboard to peel off the remaining paper scraps. Step 3: Driven by the measurement pretreatment mechanism, the laser thickness measuring mechanism continuously changes the thickness measurement position during the movement of the corrugated cardboard to obtain the thickness values ​​at multiple points on the surface of the corrugated cardboard.

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