Deviation correcting laminating machine for corrugated board processing and processing method thereof

Abstract

The present application belongs to corrugated paperboard processing technical field, specifically is corrugated paperboard processing with deviation rectification compound machine, including conveyer belt, the conveyer belt includes a plurality of deviation rectification adjusting parts, deviation rectification adjusting part includes primary regulation rail and a plurality of deviation rectification components slidingly assembled on primary regulation rail;Primary regulation rail can control the sliding position of deviation rectification component on primary regulation rail through the electric telescopic rod C installed in its interior;Deviation rectification component includes a plurality of unit deviation rectification structures, unit deviation rectification structure includes secondary regulation rail and positioning suction accessory slidingly assembled on secondary regulation rail, and positioning suction accessory is used for adsorbing and positioning surface paper;Positioning suction accessory controls the position on secondary regulation rail through the electric telescopic rod A installed in the interior of secondary regulation rail;Realize no extrusion and friction accurate deviation rectification surface paper, avoid causing corrugated paper extrusion deformation, and friction can also cause surface paper damage.

Description

Technical Field

[0001] This invention relates to the field of corrugated cardboard processing technology, specifically to a corrugated cardboard alignment and lamination machine and its processing method. Background Technology

[0002] Corrugated cardboard is a multi-layer composite board made of one or more layers of corrugated core paper, face paper, and liner paper bonded together with adhesives. Due to its advantages such as light weight, high compressive strength, good cushioning performance, and recyclability, it is widely used in the transportation and sales packaging of various products. The lamination process of corrugated cardboard refers to the process of bonding and shaping single-faced corrugated cardboard with face paper and liner paper under high temperature and pressure to produce multi-layer corrugated cardboard. In a corrugated cardboard production line, lamination is usually completed by a corrugated cardboard laminating machine, which generally includes a preheating section, an adhesive section, a laminating section, a heating section, and a cooling and shaping section. During the lamination process of multi-layer corrugated cardboard, it is necessary to ensure that the edges of the face paper and each layer of single-faced corrugated cardboard are precisely aligned; otherwise, quality problems such as misalignment and warping will occur in the laminated corrugated cardboard, increasing the scrap rate and wasting raw materials.

[0003] To correct the position of corrugated cardboard during the lamination process, existing corrugated cardboard laminating machines are typically equipped with automatic alignment devices. These devices generally consist of three parts: a detection mechanism, a control mechanism, and an execution mechanism. The detection mechanism often uses photoelectric sensors or laser detectors to monitor the edge position of the corrugated cardboard in real time. When an offset signal is detected, the control mechanism drives the execution mechanism to adjust the cardboard laterally. In terms of specific structural forms, existing alignment devices mainly fall into the following types: First, the overhead conveyor type, which deploys multiple sets of sensors and alignment wheels on the conveyor overhead conveyor. The alignment wheels press the corrugated cardboard and deflect it at a certain angle, using friction to move the cardboard laterally and achieve alignment. Second, the drive-type alignment structure, which uses a hydraulic cylinder or alignment motor in conjunction with a lead screw, slide block, or other mechanical transmission mechanism to push the alignment wheels or limit plates to move laterally, thereby correcting the position of the corrugated cardboard. Third, the baffle-type alignment structure, which uses fixed or adjustable limit baffles to mechanically limit the edges of the cardboard to achieve alignment.

[0004] The existing web-aligning devices mentioned above generally share a common problem in practical applications: regardless of whether the alignment rollers are used for pressing or the baffles are used for limiting, the alignment force requires direct contact and compression of the corrugated cardboard surface to generate sufficient friction to drive the cardboard to move laterally. This compression contact easily causes compression deformation of the corrugated cardboard, especially when the alignment rollers or baffles apply significant pressure to the corrugated core paper, which may lead to a reduction in corrugation height, deformation of the flute shape, or even buckling, thereby weakening the compressive strength and cushioning performance of the corrugated cardboard. On the other hand, the frictional contact between the alignment rollers and the face paper may also cause scratches, wear, or indentations on the face paper surface, affecting the appearance quality of the final product. To address this problem, some improvements have been attempted in the existing technology, such as using flexible rollers instead of rigid baffles to reduce damage to the corrugated paper, or controlling the alignment rollers to lift through the lower pressure section to reduce unnecessary frictional contact. However, the above solutions still fail to fundamentally eliminate the compression and friction problems of the corrugated cardboard during the alignment process, especially under high-speed production conditions, where the contradiction between alignment accuracy and cardboard protection remains prominent. Therefore, there is an urgent need to develop a new type of alignment device and processing method that can achieve efficient and accurate alignment while effectively avoiding compression deformation and damage to the face paper of corrugated cardboard. Summary of the Invention

[0005] Regarding the existing alignment technology of corrugated cardboard laminating machines, whether multiple sensors and alignment wheels are deployed on the overhead crane, or hydraulic cylinders or alignment motors are used in conjunction with lead screws, slides, and other mechanisms to drive the cardboard to move laterally, the friction required to move the corrugated paper and the linerboard is based on the pressure applied to the corrugated paper. However, this can cause deformation of the corrugated paper due to pressure, and friction can also damage the linerboard. To achieve the above objectives, this invention provides the following technical solution:

[0006] A corrugated cardboard laminating machine includes multiple corrugated rollers for conveying corrugated paper and a conveyor belt for conveying face paper. The conveyor belt is abutted against the corrugated rollers and cooperates to precisely bond the corrugated paper and face paper together. The conveyor belt includes multiple troughs and multiple alignment adjustment components. The troughs are distributed along the main body of the conveyor belt and can move in a closed loop following the conveyor belt. The alignment adjustment components correspond one-to-one with the troughs and are installed inside the troughs. The alignment adjustment components are used to correct the bonding position of the face paper on the corrugated paper. Each alignment adjustment component includes a... The system includes a primary adjustment rail and multiple correction components slidably mounted on it. The primary adjustment rail is installed inside the tank, and its internal electric telescopic rod C controls the sliding position of the correction components. The correction components consist of multiple unit correction structures arranged side-by-side. Each unit correction structure includes a secondary adjustment rail and a positioning suction device slidably mounted on it. The positioning suction device is used to adhere and position the face paper. The position of the positioning suction device on the secondary adjustment rail is controlled by an electric telescopic rod A installed inside it.

[0007] In a further embodiment, the corrugated cardboard processing alignment and laminating machine also includes an offset detection system, which includes:

[0008] At least two industrial cameras are arranged in front of the paper feed end of the laminator in a binocular stereo vision manner to simultaneously acquire left and right view image pairs containing the edge of the face paper and the edge of the single-sided corrugated paper.

[0009] An image processing module, connected to the industrial camera, is used to preprocess and extract edge features from the left and right view image pairs to obtain the sub-pixel contours of the paper edge and the corrugated paper edge.

[0010] The stereo matching and depth calculation module is connected to the image processing module and is used to perform stereo matching on the edge feature points in the left and right view image pairs, and calculate the three-dimensional spatial coordinates of the paper edge and the corrugated cardboard edge based on the camera calibration parameters.

[0011] The offset calculation module, connected to the stereo matching and depth calculation module, is used to calculate the lateral physical offset of the face paper edge relative to the corrugated cardboard edge, with the corrugated cardboard edge as the spatial reference.

[0012] The control output module is connected to the offset calculation module and multiple correction adjustment components, and is used to output an offset signal to the correction control system when the lateral physical offset exceeds a preset threshold.

[0013] The reference mark recognition module, connected to the image processing module and the offset calculation module, is used to recognize the preset reference marks on the surface of the paper and obtain the actual position coordinates of the reference marks in three-dimensional space; the offset calculation module is further used to verify and correct the lateral physical offset calculated from the edge of the paper based on the deviation between the actual position of the reference mark and the preset reference position.

[0014] A global positioning camera, mounted above or to the side of an industrial camera, has a wide-angle field of view that exceeds the field of view of the industrial camera and is used to acquire a global position image of the paper. The output of the global positioning camera is connected to the region of interest control terminal of the industrial camera to guide the industrial camera to dynamically adjust the position of the shooting window.

[0015] Furthermore, the offset calculation module includes:

[0016] The two-dimensional offset calculation unit is used to calculate the lateral pixel deviation between the edge of the face paper and the edge of the corrugated paper in the two-dimensional image plane;

[0017] The three-dimensional compensation unit, connected to the two-dimensional offset calculation unit and the stereo matching and depth calculation module, is used to perform parallax compensation on the lateral pixel deviation value based on the depth difference between the edge of the face paper and the edge of the corrugated paper, so as to obtain the lateral physical offset.

[0018] Furthermore, the image processing module includes:

[0019] A brightness normalization unit is used to perform Retinex-based brightness correction on the left and right view image pairs to eliminate the influence of changes in ambient light.

[0020] The subpixel edge extraction unit is used to perform subpixel-level edge detection on the brightness-corrected image to obtain the subpixel contours of the paperboard edge and the corrugated cardboard edge.

[0021] Furthermore, the offset detection system also includes two sets of LED strip light sources, which are symmetrically arranged on both sides of the industrial camera in a low-angle sweeping manner to generate directional illumination contrast for the edges of the face paper and the corrugated paper.

[0022] Furthermore, the control output module communicates with the correction control system via an industrial Ethernet, and the offset signal includes offset amount and offset direction information;

[0023] The correction control system is a control system for a non-contact air-float correction device or a magnetic levitation guidance device.

[0024] Another object of the present invention is to provide a processing method for the above-described corrugated cardboard processing straightening and laminating machine, comprising the following steps:

[0025] Step 1: Corrugated paper conveying and corrugation shape preservation

[0026] The corrugated paper to be laminated is conveyed through at least one set of corrugated secondary plastic rollers; the surface of the corrugated secondary plastic rollers is provided with a toothed structure that matches the corrugated shape of the corrugated paper. During the conveying process, the corrugated secondary plastic rollers mesh with the corrugated part of the corrugated paper to keep the corrugated shape of the corrugated paper unchanged.

[0027] Step 2: Synchronous delivery of tissues

[0028] The face paper is synchronously conveyed to the lamination position by the conveyor belt, so that the face paper and the corrugated paper conveyed in step one form a pre-lamination position relationship before entering the lamination and pressing area.

[0029] Step 3: Positioning and correcting the tissue paper without squeezing or friction.

[0030] Before the face paper and corrugated paper enter the composite pressing area, the face paper is corrected laterally by the correction adjustment component to make the edges of the face paper and corrugated paper precisely aligned.

[0031] The alignment adjustment component is vacuum-adsorbed onto the surface of the face paper via its positioning adsorption component, achieving a non-slip positioning connection between the alignment adjustment component and the face paper. In the adsorption state, the alignment adjustment component completes the alignment by driving the face paper to move laterally. During the alignment process, the alignment adjustment component does not compress or deform the face paper, and there is no sliding friction between the positioning adsorption component and the face paper.

[0032] Step 4: Hierarchical Corrective Control of Local and Overall Aspects

[0033] During the execution of step three, multiple correction components set at one or more locations correct the overall lateral position of the face paper. At the same time, each correction component uses a unit correction structure set at one or more locations to finely adjust the local lateral position of the face paper. The unit correction structure controls the movement of the positioning adsorption component on the secondary adjustment rail through an electric telescopic rod A to independently correct the local area of ​​the face paper, thereby further improving the alignment accuracy between the face paper and the corrugated paper on the basis of overall correction.

[0034] Compared with the prior art, the present invention can achieve the following:

[0035] 1. The corrugated roller conveys the corrugated paper to the position on the conveyor belt and adheres it to the face paper conveyed by the conveyor belt. During this process, the conveyor belt uses multiple correction adjustment components in a closed loop to act on the face paper. Multiple correction adjustment components at one location or multiple locations with multiple correction adjustment components act on the face paper to correct the position of the face paper adhering to the corrugated paper; achieving precise adhesion between the corrugated paper and the face paper. While the correction adjustment components are acting on the face paper, they use positioning suction components to adhere and position themselves on the face paper, achieving precise correction of the face paper without squeezing or friction, avoiding damage. Extrusion and deformation of corrugated paper, as well as friction, can damage the face paper. The correction adjustment component corrects the face paper as a whole through one or more correction components in one place or multiple correction components in multiple places. The correction component uses one or more unit correction structures in one place or multiple unit correction structures in multiple places, and controls the position of the positioning adsorption component on the secondary adjustment rail through the electric telescopic rod A on the unit correction structure. This completes the correction of the face paper locally, and ensures high-quality and precise bonding of corrugated paper and face paper without extrusion and friction. This is beneficial to improving the subsequent composite quality of corrugated paperboard.

[0036] 2. During the process of conveying corrugated paper by the corrugated secondary plastic roller, multiple corrugated secondary plastic rollers can be matched with the corrugation of the corrugated paper to ensure that the corrugated paper adheres to the face paper with the best quality and to avoid corrugation deformation of the corrugated paper during the transmission, which would affect the composite quality during the lamination process with the face paper.

[0037] 3. By acquiring three-dimensional spatial information of the paperboard edge through a binocular camera, the parallax caused by paperboard warping and vibration is compensated, and the two-dimensional detection accuracy is improved to the true offset in three-dimensional space, solving the measurement error problem of monocular vision under high-speed shaking of cardboard.

[0038] By using the printed patterns or preset marks on the face paper itself as a highly robust positioning reference and fusing them with the edge detection results, the failure risk of pure edge detection in low contrast or damaged edges is overcome, and the repeatability accuracy is improved.

[0039] The combination of global camera coarse positioning and binocular camera fine detection enables high-resolution imaging in local areas while ensuring a wide field of view coverage, and adapts to automatic switching of different paper widths.

[0040] The detection end is completely contactless and provides precise input for subsequent non-contact air flotation or magnetic levitation correction, eliminating the squeezing friction problem throughout the entire detection and execution process. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of a corrugated cardboard processing alignment and laminating machine according to one embodiment of the present invention;

[0043] Figure 2 This is a demonstration diagram of the alignment and lamination machine for corrugated cardboard processing in one embodiment of the present invention;

[0044] Figure 3 for Figure 2 The main view;

[0045] Figure 4 This is a schematic diagram of the structure of the correction adjustment component in one embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the unit correction structure in one embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram of the positioning adsorption element in one embodiment of the present invention;

[0048] Figure 7 This is a demonstration diagram of the corrective adjustment component acting on the face paper in one embodiment of the present invention;

[0049] Figure 8 This is a schematic diagram of the positioning adsorption element in one embodiment of the present invention.

[0050] Legend:

[0051] 1. Corrugated secondary plasticizing roller, 2. Abutting roller, 3. Conveyor belt, 4. Power unit, 5. Conveyor belt body, 6. Trench, 7. Correction and adjustment parts, 8. Corrugated paper, 9. Facing paper.

[0052] Primary adjustment rail 71, correction component 72, support shell 73, slider 74, unit correction structure 75; Secondary adjustment rail 751, electric telescopic rod A 752, guide groove 753, guide platform 754, positioning adsorption component 755; Air guide hose 7551, gasket 7552, suction cup 7553, support column 7554, electric telescopic rod B 7555. Detailed Implementation

[0053] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In one embodiment of the present invention, please refer to Figures 1-6 and Figure 8 A corrugated cardboard processing alignment and laminating machine includes multiple corrugated rollers for conveying corrugated paper 8 and a conveyor belt 3 for conveying face paper 9; the conveyor belt 3 is arranged against the corrugated rollers and cooperates to precisely bond the corrugated paper 8 and face paper 9 together.

[0055] It should be noted that: apart from the conveyor belt 3, the other structures and components of the laminating machine used for laminating corrugated paper 8 and face paper 9 are all existing technologies; they can be purchased directly on the market or assembled by purchasing parts, etc. Whether they are disclosed or not does not affect the conveyor belt 3 that is to be protected, and will not be elaborated on here.

[0056] The conveyor belt 3 includes multiple troughs 6 and multiple correction adjustment components 7. The multiple troughs 6 are distributed along the main body array of the conveyor belt 3 and can move in a closed loop following the conveyor belt 3. The multiple correction adjustment components 7 correspond one-to-one with the multiple troughs 6 and are installed inside the troughs 6. The correction adjustment components 7 are used to correct the position of the face paper 9 on the corrugated paper 8.

[0057] Therefore, the corrugated roller conveys the corrugated paper 8 to the position of the conveyor belt 3 and adheres it together with the face paper 9 conveyed by the conveyor belt 3. During this process, the conveyor belt 3 uses multiple correction adjustment elements 7 in a closed loop to act on the face paper 9. Multiple correction adjustment elements 7 at one point or multiple correction adjustment elements 7 at multiple points will act on the face paper 9 to correct the position of the face paper 9 adhering to the corrugated paper 8; thus achieving precise adhesion of the corrugated paper 8 and the face paper 9 together.

[0058] The correction adjustment component 7 includes a primary adjustment rail 71 and multiple correction components 72 slidably mounted on the primary adjustment rail 71; the primary adjustment rail 71 is installed inside the groove 6, and the primary adjustment rail 71 can control the sliding position of the correction components 72 on the primary adjustment rail 71 by extending and retracting the electric telescopic rod C installed inside it.

[0059] The correction assembly 72 includes multiple unit correction structures 75, which are arranged side by side. Each unit correction structure 75 includes a secondary adjustment rail 751 and a positioning adsorption component 755 slidably mounted on the secondary adjustment rail 751. The positioning adsorption component 755 is used to adsorb and position the face paper 9. The position of the positioning adsorption component 755 on the secondary adjustment rail 751 is controlled by an electric telescopic rod A752 installed inside the secondary adjustment rail 751.

[0060] During the process of the alignment adjustment component 7 acting on the face paper 9, the alignment adjustment component 7 uses the positioning adsorption component 755 to adsorb and position itself on the face paper 9, achieving precise alignment of the face paper 9 without compression or friction, avoiding compression and deformation of the corrugated paper 8, and preventing damage to the face paper 9 caused by friction; the alignment adjustment component 7 corrects the face paper 9 as a whole through one or more alignment components 72, or multiple alignment components 72 at multiple locations. The alignment components 72 use one or more unit alignment structures 75, or multiple unit alignment structures 75 at multiple locations, and control the position of the positioning adsorption component 755 on the secondary adjustment rail 751 through the electric telescopic rod A752 on the unit alignment structure 75, completing the local alignment of the face paper 9, achieving high-quality and precise adhesion of the corrugated paper 8 and the face paper 9 without compression or friction, which is beneficial to improving the subsequent composite quality of the corrugated board.

[0061] In summary, existing corrugated cardboard laminating machine correction technologies, whether deploying multiple sensors and correction wheels on the overhead crane, or using hydraulic cylinders or correction motors in conjunction with lead screws, slides, and other mechanisms to drive the cardboard laterally, all rely on pressure against the corrugated paper to generate friction and move the corrugated paper and face paper. However, this approach can lead to deformation of the corrugated paper due to pressure, and friction can also damage the face paper. This application addresses these issues by:

[0062] The corrugated roller conveys the corrugated paper 8 to the position of the conveyor belt 3, where it is bonded to the face paper 9 conveyed by the conveyor belt 3. During this process, the conveyor belt 3 uses multiple correction adjustment elements 7 in a closed loop to act on the face paper 9. Multiple correction adjustment elements 7 at one location or multiple locations of multiple correction adjustment elements 7 act on the face paper 9, correcting the position of the face paper 9 on the corrugated paper 8; achieving precise bonding of the corrugated paper 8 and the face paper 9 together. While the correction adjustment elements 7 are acting on the face paper 9, they are positioned and attached to the face paper 9 using positioning suction elements 755, achieving precise correction of the face paper 9 without squeezing or friction, avoiding damage to the corrugated paper 8. Extrusion deformation and friction can also damage the face paper 9. The correction adjustment component 7 corrects the face paper 9 as a whole by using one or more correction components 72. The correction component 72 uses one or more unit correction structures 75, and controls the position of the positioning adsorption component 755 on the secondary adjustment rail 751 by the electric telescopic rod A752 on the unit correction structure 75. This completes the correction of the face paper 9 locally, and ensures high-quality and precise bonding of the corrugated paper 8 and the face paper 9 without extrusion and friction, which is beneficial to improving the subsequent composite quality of the corrugated board.

[0063] In another embodiment of the present invention, please refer to Figure 4 and Figure 5The primary adjustment rail 71 is provided with a sliding groove, which is distributed along the main body of the primary adjustment rail 71; multiple electric telescopic rods C are provided, and they correspond one-to-one with multiple correction components 72.

[0064] The electric telescopic rod C is installed inside the slide groove, and its outer edge does not contact the inner wall of the slide groove. One end of the electric telescopic rod C is fixed at the end of the slide groove, and the other end is fixed on the slider 74. The slider 74 is fixed on the side wall of the correction component 72. The slider 74 slides inside the slide groove and can drive the unit correction structure 75 to slide along the slide groove.

[0065] Please see Figure 5 and Figure 6 The correction component 72 also includes a support shell 73, a slider 74 fixed on the side wall of the support shell 73, and a unit correction structure 75 installed inside the support shell 73. Multiple unit correction structures 75 are arranged in a side-by-side array along the support shell 73.

[0066] Please see Figure 6 The secondary adjustment rail 751 further includes a guide groove 753 and a guide platform 754. The guide groove 753 is formed on the main body of the secondary adjustment rail 751 and is distributed along the main body of the secondary adjustment rail 751. The guide platform 754 is slidably assembled on the guide groove 753 and can reciprocate periodically along the guide groove 753.

[0067] The electric telescopic rod A752 is installed inside the guide groove 753, and its outer edge does not contact the inner wall of the guide groove 753; one end of the electric telescopic rod A752 is fixed at the end of the guide groove 753, and the other end is fixed on the guide table 754.

[0068] The positioning adsorption component 755 is fixed on the guide table 754 and is slidably assembled on the secondary adjustment rail 751 using the guide table 754.

[0069] Please see Figure 6 and Figure 8 The positioning and adsorption component 755 includes a gasket 7552 and a suction cup 7553. The gasket 7552 is installed at the opening of the suction cup 7553 and is distributed along the edge of the opening of the suction cup 7553. An air guide hose 7551 is connected to the suction cup 7553. One end of the air guide hose 7551 is connected to the inside of the suction cup 7553, and the other end is connected to the exhaust fan. A solenoid valve is installed on the air guide hose 7551, which is used to connect the air guide hose 7551 to the outside.

[0070] It should be further noted that the solenoid valve and the exhaust fan, as well as the power supply and wiring methods of the solenoid valve and the exhaust fan, are all existing technologies; they can be purchased directly on the market, or assembled by purchasing parts, etc., and are not the subject of this invention protection, so they will not be elaborated on here.

[0071] Please see Figure 6 and Figure 8 The positioning adsorption component 755 further includes a support column 7554 and an electric telescopic rod B7555. The support column 7554 is installed at the bottom of the suction cup 7553; the electric telescopic rod B7555 is installed at the end of the support column 7554 away from the suction cup 7553; the support column 7554 and the electric telescopic rod B7555 are on the same straight line.

[0072] During the process of the alignment adjustment component 7 acting on the face paper 9, the alignment adjustment component 7 uses the suction cup 7553 on the positioning suction component 755 to adhere to the face paper 9. The positioning suction component 755 turns on the exhaust fan, and the exhaust fan draws out the air inside the suction cup 7553, causing the suction cup 7553 to be attached and positioned on the face paper 9, achieving precise alignment of the face paper 9 without squeezing or friction, avoiding squeezing and deformation of the corrugated paper 8, and avoiding damage to the face paper 9 caused by friction.

[0073] In another embodiment of the present invention, please refer to Figures 1-3 The plurality of corrugated rollers include abutment rollers 2 and a plurality of corrugated secondary plasticizing rollers 1, the abutment rollers 2 and the plurality of corrugated secondary plasticizing rollers 1 being arranged side by side in parallel, the plurality of corrugated secondary plasticizing rollers 1 being used to match the corrugations of the corrugated paper 8;

[0074] The conveyor belt 3 also includes a conveyor belt body 5, and multiple troughs 6 are formed on the conveyor belt body 5 and arranged in an array along the conveyor belt body 5; a power unit 4 is installed on the conveyor belt body 5, and the power unit 4 includes a geared motor and a servo motor.

[0075] Therefore, during the process of conveying corrugated paper 8 by the corrugated secondary plastic roller 1, multiple corrugated secondary plastic rollers 1 can be matched with the corrugations of the corrugated paper 8 to ensure that the corrugated paper 8 is bonded to the face paper 9 with the best quality, and to avoid the corrugation of the corrugated paper 8 during the transmission, which would affect the composite quality during the lamination process with the face paper 9.

[0076] In another embodiment of the present invention, the corrugated cardboard processing straightening and laminating machine further includes an offset detection system, the offset detection system comprising:

[0077] At least two industrial cameras are arranged in front of the paper feed end of the laminator in a binocular stereo vision manner to simultaneously acquire left and right view image pairs containing the edge of the face paper 9 and the edge of the single-sided corrugated paper 8.

[0078] The image processing module, connected to the industrial camera, is used to preprocess and extract edge features from the left and right view image pairs to obtain the sub-pixel contours of the edge of the face paper 9 and the edge of the corrugated paper 8.

[0079] The stereo matching and depth calculation module is connected to the image processing module and is used to perform stereo matching on the edge feature points in the left and right view image pairs, and calculate the three-dimensional spatial coordinates of the paper edge and the corrugated cardboard edge based on the camera calibration parameters.

[0080] The offset calculation module, connected to the stereo matching and depth calculation module, is used to calculate the lateral physical offset of the face paper edge relative to the corrugated cardboard edge, with the corrugated cardboard edge as the spatial reference.

[0081] The control output module is connected to the offset calculation module and multiple correction adjustment components 7, and is used to output an offset signal to the correction control system when the lateral physical offset exceeds a preset threshold.

[0082] The reference mark recognition module, connected to the image processing module and the offset calculation module, is used to recognize the preset reference marks on the surface of the face paper and obtain the actual position coordinates of the reference marks in three-dimensional space; the offset calculation module is further used to verify and correct the lateral physical offset calculated from the edge of the face paper 9 based on the deviation between the actual position of the reference mark and the preset reference position.

[0083] A global positioning camera, mounted above or to the side of an industrial camera, has a wide-angle field of view that exceeds the field of view of the industrial camera and is used to acquire a global position image of the paper. The output of the global positioning camera is connected to the region of interest control terminal of the industrial camera to guide the industrial camera to dynamically adjust the position of the shooting window.

[0084] Furthermore, the offset calculation module includes:

[0085] The two-dimensional offset calculation unit is used to calculate the lateral pixel deviation between the edge of the face paper 9 and the edge of the corrugated paper 8 in the two-dimensional image plane;

[0086] The three-dimensional compensation unit, connected to the two-dimensional offset calculation unit and the stereo matching and depth calculation module, is used to perform parallax compensation on the lateral pixel deviation value based on the depth difference between the edge of the face paper 9 and the edge of the corrugated paper 8, so as to obtain the lateral physical offset.

[0087] The image processing module includes:

[0088] A brightness normalization unit is used to perform Retinex-based brightness correction on the left and right view image pairs to eliminate the influence of changes in ambient light.

[0089] The subpixel edge extraction unit is used to perform subpixel-level edge detection on the brightness-corrected image to obtain the subpixel contours of the paperboard edge and the corrugated cardboard edge.

[0090] The offset detection system also includes two sets of LED strip light sources, which are symmetrically arranged on both sides of the industrial camera in a low-angle sweeping manner to generate directional illumination contrast between the edges of the face paper 9 and the corrugated paper 8.

[0091] The control output module communicates with the correction control system via industrial Ethernet, and the offset signal includes offset amount and offset direction information.

[0092] The correction control system is a control system for a non-contact air-float correction device or a magnetic levitation guidance device.

[0093] By acquiring three-dimensional spatial information of the edge of the face paper through a binocular camera, the parallax caused by the warping and vibration of the face paper is compensated, and the two-dimensional detection accuracy is improved to the true offset in three-dimensional space, thus solving the measurement error problem of monocular vision under high-speed shaking of cardboard.

[0094] By using the printed pattern or preset mark of the face paper 9 itself as a highly robust positioning reference and fusing it with the edge detection results, the failure risk of pure edge detection in low contrast or damaged edges is overcome, and the repeatability accuracy is improved.

[0095] The combination of global camera coarse positioning and binocular camera fine detection enables local high-resolution imaging while ensuring a wide field of view coverage, and adapts to automatic switching of different paper widths.

[0096] The detection end is completely contactless and provides precise input for subsequent non-contact air flotation or magnetic levitation correction, eliminating the squeezing friction problem throughout the entire detection and execution process.

[0097] The paper offset detection method uses the offset detection system described above and includes the following steps:

[0098] Step S1: Simultaneously acquire left and right view image pairs, including the edge of the face paper and the edge of the single-sided corrugated board, in front of the paper feed end of the corrugated board laminating machine using at least two industrial cameras arranged in a binocular stereo vision manner.

[0099] Step S2: Preprocess the left and right view image pairs and extract subpixel edge features to obtain the subpixel contours of the paperboard edge and the corrugated cardboard edge.

[0100] Step S3: Perform stereo matching on the edge feature points in the left and right view image pairs, and calculate the three-dimensional spatial coordinates of the face paper edge and the corrugated cardboard edge based on the camera calibration parameters;

[0101] Step S4: Using the edge of the corrugated cardboard as a spatial reference, calculate the lateral physical offset of the face paper edge relative to the edge of the corrugated cardboard.

[0102] Step S5: When the lateral physical offset exceeds the preset threshold, an offset signal is output to the correction control system of the corrugated cardboard laminating machine.

[0103] One embodiment of the present invention provides a processing method for the above-described corrugated cardboard straightening and laminating machine, comprising the following steps:

[0104] Step 1: Transferring Corrugated Paper 8 and Preserving Corrugated Shape

[0105] The corrugated paper 8 to be laminated is conveyed through at least one set of corrugated secondary plastic rollers 1; the surface of the corrugated secondary plastic rollers 1 is provided with a toothed structure that matches the corrugated shape of the corrugated paper 8. During the conveying process, the corrugated secondary plastic rollers 1 mesh with the corrugated part of the corrugated paper 8 to keep the corrugated shape of the corrugated paper 8 unchanged.

[0106] Step 2: Synchronous delivery of tissue paper 9

[0107] The face paper 9 is synchronously conveyed to the composite position by the conveyor belt 3, so that the face paper 9 and the corrugated paper 8 conveyed in step one form a pre-bonding position relationship before entering the composite pressing area.

[0108] Step 3: Positioning and correcting the paper 9 without compression or friction

[0109] Before the face paper 9 and the corrugated paper 8 enter the composite pressing area, the lateral position correction of the face paper 9 is applied by the correction adjustment component 7 to make the edges of the face paper 9 and the corrugated paper 8 precisely aligned.

[0110] Among them, the correction adjustment component 7 is adsorbed onto the surface of the face paper 9 by the positioning adsorption component 755 on it in a vacuum adsorption manner, so as to achieve a positioning connection between the correction adjustment component 7 and the face paper 9 without relative sliding; the correction adjustment component 7 completes the correction by driving the face paper 9 to move laterally in the adsorption state. During the correction process, the correction adjustment component does not compress or deform the face paper, and there is no sliding friction between the positioning adsorption component 755 and the face paper 9.

[0111] Step 4: Hierarchical Corrective Control of Local and Overall Aspects

[0112] During the execution of step three, multiple correction components 72, set at one or more locations, correct the overall lateral position of the face paper. At the same time, each correction component 72, set at one or more locations, finely adjusts the local lateral position of the face paper 9 through unit correction structures 75. The unit correction structure 75 controls the movement of the positioning adsorption component 755 on the secondary adjustment rail 751 through the electric telescopic rod A752, and independently corrects the local area of ​​the face paper 9, thereby further improving the alignment accuracy between the face paper 9 and the corrugated paper 8 on the basis of overall correction.

[0113] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0114] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A corrugated cardboard processing alignment and laminating machine, comprising a plurality of corrugated rollers for conveying corrugated paper (8) and a conveyor belt (3) for conveying face paper (9); the conveyor belt (3) is disposed together with the corrugated rollers and cooperates to precisely bond the corrugated paper (8) and face paper (9) together; characterized in that, The conveyor belt (3) includes multiple troughs (6) and multiple correction adjustment components (7). The multiple troughs (6) are distributed along the main array of the conveyor belt (3) and can move in a closed loop following the conveyor belt (3). The multiple correction adjustment components (7) correspond one-to-one with the multiple troughs (6) and are installed inside the troughs (6). The correction adjustment components (7) are used to correct the position of the face paper (9) on the corrugated paper (8). The correction adjustment component (7) includes a primary adjustment rail (71) and multiple correction components (72) slidably mounted on the primary adjustment rail (71); the primary adjustment rail (71) is installed inside the groove (6), and the primary adjustment rail (71) can control the sliding position of the correction components (72) on the primary adjustment rail (71) by extending and retracting the electric telescopic rod C installed inside it. The correction assembly (72) includes multiple unit correction structures (75), which are arranged side by side. Each unit correction structure (75) includes a secondary adjustment rail (751) and a positioning adsorption component (755) that is slidably mounted on the secondary adjustment rail (751). The positioning adsorption component (755) is used to adsorb and position the face paper (9). The position of the positioning adsorption component (755) on the secondary adjustment rail (751) is controlled by an electric telescopic rod A (752) installed inside the secondary adjustment rail (751).

2. The corrugated cardboard processing alignment and laminating machine according to claim 1, characterized in that, The primary adjustment rail (71) is provided with a sliding groove, which is distributed along the main body of the primary adjustment rail (71); multiple electric telescopic rods C are provided, and they correspond one-to-one with multiple correction components (72); The electric telescopic rod C is installed inside the slide groove, and its outer edge does not contact the inner wall of the slide groove; one end of the electric telescopic rod C is fixed at the end of the slide groove, and the other end is fixed on the slider (74). The slider (74) is fixed on the side wall of the correction component (72). The slider (74) slides inside the slide groove and can drive the unit correction structure (75) to slide along the slide groove.

3. The corrugated cardboard processing alignment and laminating machine according to claim 2, characterized in that, The correction component (72) also includes a support shell (73), a slider (74) fixed on the side wall of the support shell (73), a unit correction structure (75) installed inside the support shell (73), and multiple unit correction structures (75) arranged in a side-by-side array along the support shell (73).

4. The corrugated cardboard processing alignment and laminating machine according to claim 1, characterized in that, The secondary adjustment rail (751) also includes a guide groove (753) and a guide platform (754). The guide groove (753) is formed on the main body of the secondary adjustment rail (751) and is distributed along the main body of the secondary adjustment rail (751). The guide platform (754) is slidably mounted on the guide groove (753) and can reciprocate periodically along the guide groove (753). The electric telescopic rod A (752) is installed inside the guide groove (753), and its outer edge does not contact the inner wall of the guide groove (753); one end of the electric telescopic rod A (752) is fixed at the end of the guide groove (753), and the other end is fixed on the guide platform (754). The positioning adsorption component (755) is fixed on the guide table (754) and slidably mounted on the secondary adjustment rail (751) using the guide table (754).

5. The corrugated cardboard processing alignment and laminating machine according to claim 4, characterized in that, The positioning adsorption component (755) includes a gasket (7552) and a suction cup (7553). The gasket (7552) is installed at the opening of the suction cup (7553) and distributed along the edge of the opening of the suction cup (7553). A duct hose (7551) is connected to the suction cup (7553). One end of the duct hose (7551) is connected to the inside of the suction cup (7553), and the other end is connected to the exhaust fan. A solenoid valve is installed on the duct hose (7551). The solenoid valve is used to connect the duct hose (7551) to the outside.

6. The corrugated cardboard processing alignment and laminating machine according to claim 5, characterized in that, The positioning suction device (755) also includes a support column (7554) and an electric telescopic rod B (7555). The support column (7554) is installed at the bottom of the suction cup (7553). The electric telescopic rod B (7555) is installed at the end of the support column (7554) away from the suction cup (7553). The support column (7554) and the electric telescopic rod B (7555) are on the same straight line.

7. The corrugated cardboard processing alignment and laminating machine according to claim 1, characterized in that, The plurality of corrugated rollers include abutment rollers (2) and a plurality of corrugated secondary plasticizing rollers (1), the abutment rollers (2) and the plurality of corrugated secondary plasticizing rollers (1) being arranged in parallel side by side, the plurality of corrugated secondary plasticizing rollers (1) being used to match the corrugation of the corrugated paper (8); The conveyor belt (3) also includes a conveyor belt body (5), and multiple troughs (6) are opened on the conveyor belt body (5) and are arranged in an array along the conveyor belt body (5); a power unit (4) is installed on the conveyor belt body (5), and the power unit (4) includes a geared motor and a servo motor.

8. The corrugated cardboard processing alignment and laminating machine according to claim 1, characterized in that, It also includes an offset detection system, which includes: At least two industrial cameras are arranged in front of the paper feed end of the laminating machine in a binocular stereo vision manner to simultaneously acquire left and right view image pairs containing the edge of the face paper (9) and the edge of the single-sided corrugated paper (8). The image processing module is connected to the industrial camera and is used to preprocess and extract edge features from the left and right view image pairs to obtain the sub-pixel contours of the edge of the face paper (9) and the edge of the corrugated paper (8). The stereo matching and depth calculation module is connected to the image processing module and is used to perform stereo matching on the edge feature points in the left and right view image pairs, and calculate the three-dimensional spatial coordinates of the paper edge and the corrugated cardboard edge based on the camera calibration parameters. The offset calculation module, connected to the stereo matching and depth calculation module, is used to calculate the lateral physical offset of the face paper edge relative to the corrugated cardboard edge, with the corrugated cardboard edge as the spatial reference. The control output module is connected to the offset calculation module and multiple correction adjustment components (7) and is used to output an offset signal to the correction control system when the lateral physical offset exceeds a preset threshold. The reference mark recognition module is connected to the image processing module and the offset calculation module. It is used to recognize the preset reference marks on the surface of the paper and obtain the actual position coordinates of the reference marks in three-dimensional space. The offset calculation module is further used to verify and correct the lateral physical offset calculated on the edge of the paper (9) based on the deviation between the actual position of the reference mark and the preset reference position. A global positioning camera, mounted above or to the side of an industrial camera, has a wide-angle field of view that exceeds the field of view of the industrial camera and is used to acquire a global position image of the paper. The output of the global positioning camera is connected to the region of interest control terminal of the industrial camera to guide the industrial camera to dynamically adjust the position of the shooting window.

9. The corrugated cardboard processing alignment and laminating machine according to claim 8, characterized in that, The offset calculation module includes: The two-dimensional offset calculation unit is used to calculate the lateral pixel deviation between the edge of the face paper (9) and the edge of the corrugated paper (8) in the two-dimensional image plane; The three-dimensional compensation unit is connected to the two-dimensional offset calculation unit and the stereo matching and depth calculation module. It is used to perform parallax compensation on the horizontal pixel deviation value based on the depth difference between the edge of the face paper (9) and the edge of the corrugated paper (8) to obtain the horizontal physical offset.

10. A processing method for a corrugated cardboard alignment and laminating machine according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Transferring and maintaining the shape of the corrugated paper (8) The corrugated paper (8) to be laminated is conveyed through at least one set of corrugated secondary plastic rollers (1); the surface of the corrugated secondary plastic rollers (1) is provided with a toothed structure that matches the corrugated shape of the corrugated paper (8). During the conveying process, the corrugated secondary plastic rollers (1) mesh with the corrugated part of the corrugated paper (8) to keep the corrugated shape of the corrugated paper (8) unchanged. Step 2: Synchronous delivery of tissues (9) The face paper (9) is synchronously conveyed to the composite position by the conveyor belt (3), so that the face paper (9) and the corrugated paper (8) conveyed in step one form a pre-bonding position relationship before entering the composite pressing area; Step 3: Non-compression and frictionless alignment and positioning of the face paper (9) Before the face paper (9) and corrugated paper (8) enter the composite pressing area, the face paper (9) is corrected laterally by the correction adjustment component (7) so that the edges of the face paper (9) and corrugated paper (8) are precisely aligned. Among them, the correction adjustment component (7) is adsorbed onto the surface of the face paper (9) by the positioning adsorption component (755) on it in a vacuum adsorption manner, so as to achieve a positioning connection between the correction adjustment component (7) and the face paper (9) without relative sliding; the correction adjustment component (7) completes the correction by driving the face paper (9) to move laterally in the adsorption state. During the correction process, the correction adjustment component does not cause the face paper to be squeezed and deformed, and there is no sliding friction between the positioning adsorption component (755) and the face paper (9); Step 4: Hierarchical Corrective Control of Local and Overall Aspects During the execution of step three, the overall lateral position of the face paper is corrected by multiple correction components (72) set in one or more locations; at the same time, the local lateral position of the face paper (9) is finely adjusted by unit correction structures (75) set in one or more locations within each correction component (72); wherein, the unit correction structure (75) controls the movement position of the positioning adsorption component (755) on the secondary adjustment rail (751) through the electric telescopic rod A (752) to independently correct the local area of ​​the face paper (9), thereby further improving the alignment accuracy between the face paper (9) and the corrugated paper (8) on the basis of overall correction.

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