A paperboard transfer conveyor correction mechanism

Abstract

The paperboard transfer conveying deviation correction mechanism relates to the technical field of paperboard processing equipment and is used for realizing automatic centering and deviation correction in the paperboard transfer process and guaranteeing detection accuracy and processing precision. The paperboard transfer conveying deviation correction mechanism is arranged on an equipment main body, the equipment main body is provided with conveying rollers and a conveying surface, the conveying rollers and the conveying surface are distributed at intervals, and the paperboard transfer conveying deviation correction mechanism comprises a guide shaft, a transmission shaft, a driving piece, a deviation correction plate and a detection assembly. The guide shaft is fixedly arranged on the equipment main body, the guide shaft is located below the conveying rollers and is distributed in parallel with the conveying rollers, the transmission shaft is rotatably arranged on the equipment main body, the guide shaft is located below the conveying rollers and is distributed in parallel with the conveying rollers, and the transmission shaft is distributed at intervals with the guide shaft. The driving piece is fixedly arranged at one end of the guide shaft, the driving piece is in transmission connection with the transmission shaft, the deviation correction plate comprises an integrally formed connecting portion and a deviation correction portion, the connecting portion is in transmission connection with the transmission shaft and in sliding connection with the guide shaft.

Description

Technical Field

[0001] This application relates to the field of paperboard processing equipment technology, and in particular to a paperboard transfer and conveying correction mechanism. Background Technology

[0002] In continuous paperboard printing or paperboard alignment operations, both the printing process and the warpage detection process require continuous transfer of the paperboard via a conveying mechanism.

[0003] However, existing conveying equipment lacks a targeted width-direction positioning and correction structure. During the conveying process of the cardboard on the transport rollers, the cardboard is prone to displacement deviation in the width direction due to factors such as uneven force and feeding deviation.

[0004] This offset issue directly leads to: misalignment between the detection element and the preset detection area of ​​the cardboard during warpage detection, resulting in distorted data and affecting the accuracy of quality judgment; deviation of the pattern from the target position during printing, resulting in defects such as misprints and omissions; and accumulation of positioning errors in subsequent processes such as die-cutting and gluing, ultimately leading to product quality defects and significantly increasing the scrap rate. Utility Model Content

[0005] This application provides a cardboard transfer and conveying correction mechanism to achieve automatic centering and correction during cardboard transfer, ensuring detection accuracy and processing precision.

[0006] This application provides a cardboard transfer and conveying correction mechanism, which is mounted on the main body of a device. The main body of the device is equipped with a transport roller and a conveying surface, which are spaced apart. The cardboard transfer and conveying correction mechanism includes a guide shaft, a drive shaft, a drive component, a correction plate, and a detection component. The guide shaft is fixedly mounted on the main body of the device, located below the transport roller and parallel to it. The drive shaft is rotatably mounted on the main body of the device, located below the transport roller and parallel to it, with the drive shaft and guide shaft spaced apart. The drive component is fixedly mounted at one end of the guide shaft and is connected to the drive shaft. The correction plate includes an integrally formed connecting part and a correction part. The connecting part is connected to the drive shaft and slidably connected to the guide shaft. The correction part passes through the gap between the transport roller and the conveying surface and extends above the transport roller. Two correction plates are provided, spaced apart, with the distance between the two correction plates being greater than the width of the cardboard. The detection element is mounted on the main body of the device, located above the transport roller, and is used to inspect the state of the cardboard. The detection element is controlled by the drive component.

[0007] In this application, the guide shaft and the drive shaft are parallel and spaced apart below the transport roller, and are fixed / rotatably mounted on the main body of the equipment respectively; the drive component is fixed to one end of the guide shaft and is connected to the drive shaft for transmission; the correction plate is an integrally formed connecting part + correction part, the connecting part is driven by the drive shaft and the guide shaft slides, the correction part extends through the gap between the transport roller and the conveying surface to the top of the transport roller, and the distance between the two correction plates is greater than the width of the cardboard; the detection element is located above the transport roller and is controlled and connected to the drive component.

[0008] Specifically addressing the misalignment issue caused by the lack of a width-direction correction structure in existing equipment, this system achieves automatic cardboard correction through a linked structure of "detection element + drive component + correction plate," avoiding defects such as misalignment of the detection area and printing offset. The correction plate's design, which extends through the gap between the transport roller and the conveying surface, is compatible with the existing transport roller + conveying surface layout, requiring no major modifications to the original equipment and lowering the application threshold. The one-piece molded correction plate structure boasts high strength, with the correction section extending above the transport roller to directly act on the cardboard conveying area, preventing the failure of correction force transmission and improving correction reliability. The distance between the two correction plates is greater than the width of the cardboard, allowing for the adaptation of cardboard of different widths and expanding the scope of application.

[0009] In some embodiments of this application, the drive shaft and the alignment plate are connected by a threaded drive, and the drive shaft is provided with an external thread for driving the movement of the alignment plate. Threaded drives have the characteristics of low friction coefficient, high transmission efficiency, and high positioning accuracy, avoiding the jamming or gap errors of traditional sliding drives, and ensuring that the movement of the alignment plate is precise and controllable.

[0010] In some embodiments of this application, from the middle of the drive shaft to both ends, the two parts of the drive shaft have the same thread but opposite directions, and the two straightening plates are symmetrically distributed relative to the middle of the drive shaft.

[0011] When the drive shaft rotates, the two correction plates move towards or away from the center synchronously, ensuring that the cardboard is always aligned with the conveyor center line and avoiding secondary offset caused by unilateral correction. The symmetrical reverse movement makes the cardboard subjected to balanced force on both sides, and the correction process is smooth, avoiding cardboard skewing or edge damage. It is especially suitable for thin and easily deformable cardboard.

[0012] In some embodiments of this application, the correction plate further includes a protrusion, which is fixedly connected to the correction part. The protrusion is at least partially disposed on the upper side of the transport roller and is disposed on the plate surface of the correction plate facing the middle of the drive shaft.

[0013] The raised blocks increase the contact area and limiting height with the edge of the cardboard, preventing the cardboard from slipping or tipping over during conveying or correction, especially for warped cardboard or high-speed conveying scenarios. The design of the raised blocks on the upper side of the conveyor rollers directly acts on the effective conveying area of ​​the cardboard, avoiding correction failure due to the point of application being too low. Compared with hard contact compression, the limiting method of the raised blocks can disperse the force and reduce the risk of indentation or damage to the edge of the cardboard.

[0014] In some embodiments of this application, the detection element is an infrared light curtain sensor. The infrared light curtain sensor can form a continuous detection area, detect the edge position of the cardboard without contact, and has a fast response speed (millisecond level), making it suitable for continuous high-speed cardboard conveying scenarios. It is not affected by the color or surface roughness of the cardboard, and can stably detect the offset state of different types of cardboard, avoiding detection errors caused by ambient light or dust.

[0015] In some embodiments of this application, the detection element further includes a CCD vision positioning system. The CCD vision positioning system can accurately identify minute deviations at the edge of the cardboard (with micrometer-level accuracy), compensating for the shortcomings of infrared light curtain sensors in high-precision scenarios, and is suitable for processes such as fine printing and high-requirement warp detection.

[0016] In some embodiments of this application, the detection element and the drive component are connected via PLC control. The PLC can quickly process the signals from the detection element and accurately control the start, stop, speed, and direction of the drive component, avoiding response delays or operational errors caused by manual intervention. Through PLC programming, parameters such as the correction threshold and correction speed can be adjusted to adapt to different cardboard materials and conveying speeds, improving the versatility of the mechanism.

[0017] In some embodiments of this application, mounting plates extend from the main body of the device in the direction of the transport roller. Multiple mounting plates are provided and spaced apart. Guide shafts and drive shafts are both mounted on the mounting plates. The mounting plates provide multi-point support for the guide shafts and drive shafts, preventing deflection deformation of the long shafts during operation and ensuring guiding accuracy and transmission stability.

[0018] In some embodiments of this application, three mounting plates are provided, which are respectively located at both ends and the middle of the drive shaft. The drive component is located on the outside of the mounting plate, and at least one end of the drive shaft passes through the mounting plate.

[0019] The central mounting plate effectively suppresses the deflection of the drive shaft in the middle, avoiding a decrease in the accuracy of the threaded transmission due to shaft deformation, and is especially suitable for long drive shaft scenarios; the drive component is located on the outside of the mounting plate to avoid interference with the conveying channel and the correction plate, while also facilitating the inspection and maintenance of the drive component. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0021] Figure 1 This is a schematic diagram of the structure of the cardboard transfer and conveying correction mechanism provided in the embodiments of this application after installation.

[0022] Reference numerals: 1-Main body of equipment; 11-Transport roller; 12-Conveying surface; 13-Mounting plate; 2-Paper transfer and conveying correction mechanism; 21-Guide shaft; 22-Drive shaft; 23-Drive component; 24-Correction plate; 241-Connecting part; 242-Correction part; 243-Protrusion block; 25-Detection element. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0027] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0028] In continuous paperboard printing or paperboard alignment operations, both the printing process and the warpage detection process require continuous transfer of the paperboard via a conveying mechanism.

[0029] However, existing conveying equipment lacks a targeted width-direction positioning and correction structure. During the conveying process of the cardboard on the transport rollers, the cardboard is prone to displacement deviation in the width direction due to factors such as uneven force and feeding deviation.

[0030] This offset issue directly leads to: misalignment between the detection element and the preset detection area of ​​the cardboard during warpage detection, resulting in distorted data and affecting the accuracy of quality judgment; deviation of the pattern from the target position during printing, resulting in defects such as misprints and omissions; and accumulation of positioning errors in subsequent processes such as die-cutting and gluing, ultimately leading to product quality defects and significantly increasing the scrap rate.

[0031] Therefore, please refer to Figure 1 This application provides a cardboard transfer and conveying correction mechanism 2, which is installed on the main body 1 of the equipment. The main body 1 of the equipment is provided with a transport roller 11 and a conveying surface 12. The transport roller 11 and the conveying surface 12 are distributed at intervals to cooperate in realizing the smooth conveying of cardboard.

[0032] Please refer to Figure 1 The main body 1 of the equipment serves as the mounting base for the entire correction mechanism. This equipment can be a printing device, a warping detection device, or other cardboard printing-related equipment. The transport roller 11 can be made of seamless steel pipe with a wear-resistant rubber coating on its surface. The transport roller 11 is horizontally positioned in the middle of the main body 1, with both ends connected to the side walls of the main body 1 via rolling bearings. It can rotate flexibly around its own axis, which is parallel to the length of the main body 1.

[0033] Please refer to Figure 1 The cardboard transfer and conveying correction mechanism 2 includes a guide shaft 21, a transmission shaft 22, a drive component 23, a correction plate 24, and a detection component.

[0034] Please refer to Figure 1 The guide shaft 21 is fixedly mounted on the main body 1 of the equipment. The guide shaft 21 is located below the conveyor roller 11 and is distributed parallel to the conveyor roller 11. The guide shaft 21 can be made of 45 steel and has a cylindrical structure. Its outer diameter can be 30mm-40mm, and its length can be the same as that of the conveyor roller 11. The surface can be heat-treated and chrome-plated for rust prevention. The thickness of the chrome plating layer can be 0.05mm-0.1mm to improve wear resistance and smoothness.

[0035] Please refer to Figure 1 The guide shaft 21 is fixedly mounted on three mounting plates 13 and connected to the mounting holes on the mounting plates 13 by interference fit. Both ends are locked and positioned by nuts. Its position can be located directly below the transport roller 11, and its axis is completely parallel to the axis of the transport roller 11 to ensure accurate guidance for the correction plate 24.

[0036] Please refer to Figure 1 The drive shaft 22 is rotatably mounted on the main body 1 of the equipment. The guide shaft 21 is located below the conveyor roller 11 and is distributed parallel to the conveyor roller 11. The drive shaft 22 and the guide shaft 21 are spaced apart. The drive shaft 22 can also be made of 45 steel and has a cylindrical structure. Its outer diameter can be the same as that of the guide shaft 21, and its length can be slightly longer than that of the guide shaft 21 so that one end can extend to the outside of the mounting plate 13 and connect with the drive component 23.

[0037] Please refer to Figure 1 The drive shaft 22 has external threads machined from the middle to both ends. The thread angle can be 30 degrees. The thread directions from the middle to the ends are opposite, i.e., the left side is a left-hand thread and the right side is a right-hand thread. The drive shaft 22 is rotatably mounted on three mounting plates 13 via deep groove ball bearings. The inner ring of the bearing is interference-fitted with the drive shaft 22, and the outer ring is transition-fitted with the mounting holes on the mounting plates 13. The drive shaft 22 and the guide shaft 21 are spaced apart along a direction perpendicular to the paperboard conveying direction, with a spacing of 80mm-100mm, and their axes always remain parallel.

[0038] Please refer to Figure 1 The drive component 23 is fixedly mounted on one end of the guide shaft 21 and is connected to the transmission shaft 22. The drive component 23 can be a servo motor, and its housing can be made of cast iron, providing good heat dissipation and mechanical strength. The drive component 23 can be bolted to the outside of the mounting plate 13 at one end of the guide shaft 21, and a rubber shock-absorbing pad is added to the fixing surface to reduce vibration transmission during motor operation.

[0039] The output shaft of the drive unit 23 can be directly connected to the extension end of the transmission shaft 22 via a coupling, or it can be a gear drive or a belt drive.

[0040] Please refer to Figure 1 The correction plate 24 includes an integrally formed connecting part 241 and a correction part 242. The connecting part 241 is connected to the drive shaft 22 and slidably connected to the guide shaft 21. The correction part 242 passes through the gap between the transport roller 11 and the conveying surface 12 and extends above the transport roller 11.

[0041] Two correction plates 24 are provided, which are distributed at intervals, and the distance between the two correction plates 24 is greater than the width of the cardboard. The correction plates 24 can be integrally extruded from 6061 aluminum alloy, and the whole can be divided into a connecting part 241 and a correction part 242, and also includes a fixedly set protrusion 243.

[0042] The connecting part 241 can be a rectangular plate structure, and its width can be adapted to the spacing between the guide shaft 21 and the transmission shaft 22. Two through holes are opened in the middle of the connecting part 241. One of the through holes can be a smooth hole with a diameter 0.1mm-0.2mm larger than the outer diameter of the guide shaft 21, forming a clearance fit with the guide shaft 21 to achieve a sliding connection along the axis of the guide shaft 21. The other through hole is an internal thread hole with a thread specification that matches the external thread of the transmission shaft 22 to form a threaded transmission connection.

[0043] The correction part 242 can be a vertical plate structure, integrally formed vertically with the connecting part 241, and its thickness can be the same as that of the connecting part 241. Its upper part passes through the gap between the transport roller 11 and the conveying surface 12 and extends to 30mm-40mm above the transport roller 11. The length of the extended part can cover the effective width of the cardboard conveying.

[0044] The protrusion 243 can be a rectangular block structure, and the material can be the same as that of the correction plate 24 or nitrile rubber. It is fixedly connected to the plate surface of the correction part 242 facing the middle of the drive shaft 22 by bolts or adhesive. At least the upper half of it is located on the upper side of the transport roller 11 and can be flush with the upper edge of the correction part 242 to form a limiting protrusion for the edge of the cardboard.

[0045] Please refer to Figure 1 Two correction plates 24 are provided, symmetrically distributed relative to the center of the drive shaft 22. In the initial state, the distance between the two correction plates 24 is 50mm-80mm larger than that of the most common cardboard with the largest width, so it can be adapted to cardboard of different width specifications.

[0046] Please refer to Figure 1 The detection element 25 is set on the main body 1 of the equipment and is located above the conveyor roller 11. The detection element 25 is used to inspect the state of the paperboard and is connected to the drive unit 23 for control.

[0047] The detection element 25 may include an infrared light curtain sensor and an optional CCD vision positioning system. The infrared light curtain sensor may be a through-beam sensor, with both its transmitting and receiving ends having a cuboid structure and an engineering plastic housing. It is fixedly mounted on the mounting plates 13 on both sides of the main body 1 by an L-shaped bracket. The axes of the transmitting and receiving ends are on the same horizontal plane and perpendicular to the paperboard conveying direction, forming a continuous infrared detection light curtain.

[0048] The CCD vision positioning system uses an industrial camera with a lens. The housing can be made of aluminum alloy and is fixed on the mounting plate 13 in the middle via an adjustable bracket. The lens faces the cardboard conveying surface 12, and the shooting range covers the entire width of the cardboard to accurately identify the edge position of the cardboard.

[0049] The detection element 25 can be connected to the PLC controller and is fixedly installed on the electrical mounting plate 13 inside the main body of the equipment 1. It is connected to the detection element 25 and the drive component 23 through a shielded cable to realize signal transmission and control command sending.

[0050] Please refer to Figure 1 In this application, the guide shaft 21 and the drive shaft 22 are parallel and spaced apart below the transport roller 11, and are fixed / rotatably mounted on the main body 1 of the equipment respectively; the drive component 23 is fixed to one end of the guide shaft 21 and is connected to the drive shaft 22 for transmission; the correction plate 24 is an integrally formed connecting part 241 + correction part 242, the connecting part 241 is driven by the drive shaft 22 and the guide shaft 21 slides, and the correction part 242 extends through the gap between the transport roller 11 and the conveying surface 12 to the top of the transport roller 11, and the distance between the two correction plates 24 is greater than the width of the cardboard; the detection element 25 is located above the transport roller 11 and is controlled and connected to the drive component 23.

[0051] To address the misalignment issue caused by the lack of a width-direction correction structure in existing equipment, this invention utilizes a linked structure of "detection element 25 + drive component 23 + correction plate 24" to achieve automatic cardboard correction, avoiding defects such as misalignment of the detection area and printing offset. The design of the correction plate 24, which passes through the gap between the transport roller 11 and the conveying surface 12, is compatible with the existing layout of the transport roller 11 + conveying surface 12, requiring no major modifications to the original equipment and lowering the application threshold. The one-piece molded correction plate 24 has high structural strength, and the correction part 242 extends above the transport roller 11 to directly act on the cardboard conveying area, avoiding failure in the transmission of correction force and improving the reliability of correction. The distance between the two correction plates 24 is greater than the width of the cardboard, which can accommodate cardboard of different widths and expand the scope of application.

[0052] In some examples, the detection function is achieved through the collaboration of an infrared light curtain sensor and a CCD vision positioning system. The two detection methods complement each other, ensuring both speed and accuracy of detection.

[0053] The infrared light curtain sensor employs a through-beam detection principle. The transmitter continuously emits an infrared beam, forming a continuous light curtain perpendicular to the cardboard conveying direction, while the receiver receives the beam in real time. When the cardboard remains at a preset center position during conveying, its edges do not obstruct the preset detection area of ​​the light curtain. When the cardboard shifts in width, its edges obstruct the corresponding beam of the light curtain. The receiver calculates the direction and amount of the cardboard shift based on the position and number of obstructed beams. This sensor has a response time of ≤1ms, meeting the real-time detection requirements of high-speed conveying scenarios. It is unaffected by cardboard color or surface roughness and exhibits strong anti-interference capabilities.

[0054] The optional CCD vision positioning system employs image recognition principles, using an industrial camera to capture real-time images of the cardboard conveying process and transmitting the image data to a PLC controller. The controller incorporates image processing algorithms to perform grayscale conversion, edge extraction, and other processing on the images, accurately identifying the pixel coordinates of the cardboard edges. Based on preset center reference coordinates, it calculates the actual offset and direction of the cardboard. This system achieves a detection accuracy of ±0.05mm, capable of identifying minute offsets and cardboard skewing that are difficult to detect with infrared light curtain sensors, making it particularly suitable for high-precision printing and scenarios requiring high warpage detection.

[0055] The two detection methods can work independently or in combination, and users can choose according to the processing accuracy requirements: for ordinary accuracy scenarios, only the infrared light curtain sensor is used to achieve rapid detection; for high accuracy scenarios, both detection elements are used simultaneously, and the CCD vision positioning system calibrates the detection data of the infrared light curtain sensor to improve detection accuracy.

[0056] In some examples, a PLC closed-loop control method can be used to achieve automated linkage between detection signals and correction actions, resulting in a clear control process, rapid response, and strong stability.

[0057] The PLC controller pre-stores parameters such as the preset width, center reference position, offset threshold, and correction speed of the cardboard. The detection element 25 collects the offset data of the cardboard in real time and transmits the data to the PLC controller in the form of an electrical signal through a shielded cable. The transmission frequency is consistent with the detection frequency of the detection element 25.

[0058] After receiving the signal, the PLC controller processes the data in real time: First, it determines whether the offset exceeds the preset threshold. If it does not exceed the threshold, it determines that the cardboard conveying is normal, the controller does not send a correction command, the drive unit 23 remains in a stopped state, and the cardboard continues to be conveyed normally; if the offset exceeds the threshold, the controller calculates the starting direction, speed and running time of the drive unit 23 based on the offset direction and offset, and generates the corresponding control command.

[0059] Control commands are transmitted to the drive unit 23 via cable. The drive unit 23 starts and runs according to the commands, driving the transmission shaft 22 to rotate, which in turn drives the correction plate 24 to perform correction actions. At the same time, the detection element 25 continuously collects cardboard position data and feeds it back to the PLC controller, forming a closed-loop control. The controller adjusts the operating parameters of the drive unit 23 in real time based on the feedback data to ensure that the correction action is accurate and controllable until the cardboard returns to the preset center position.

[0060] In addition, the PLC controller also has functions such as parameter setting, fault diagnosis, and data recording. Users can modify parameters such as offset threshold and correction speed through the touch screen (not shown) to adapt to different cardboard materials and processing requirements. When the detection element 25, drive element 23, etc. malfunction, the controller will issue an alarm signal and record the fault type for easy maintenance.

[0061] Please refer to Figure 1 In some examples, the drive shaft 22 is connected to the alignment plate 24 via a threaded drive, and the drive shaft 22 is provided with an external thread for driving the alignment plate 24. Threaded drives have the characteristics of low friction coefficient, high transmission efficiency, and high positioning accuracy, avoiding the jamming or gap error of traditional sliding drives, and ensuring that the movement of the alignment plate 24 is precise and controllable.

[0062] In some examples, the threaded drive between the drive shaft 22 and the straightening plate 24 can be directly connected by threads, or it can be other drive methods.

[0063] Please refer to Figure 1 In some examples, from the middle of the drive shaft 22 to both ends, the two parts of the drive shaft 22 have the same thread but opposite directions, and the two straightening plates 24 are symmetrically distributed relative to the middle of the drive shaft 22.

[0064] When the drive shaft 22 rotates, the two correction plates 24 move closer to or further away from the center in sync, ensuring that the cardboard is always aligned with the conveyor center line and avoiding secondary offset caused by unilateral correction; the symmetrical reverse movement makes the cardboard subjected to balanced force on both sides, the correction process is smooth, and the cardboard is prevented from skewing or edge damage, which is especially suitable for thin and easily deformable cardboard.

[0065] In some examples, the specific data for the external thread can be selected as needed to ensure that the required accuracy is met.

[0066] In some examples, the correction plate 24 also includes a protrusion 243, which is fixedly connected to the correction part 242. The protrusion 243 is at least partially disposed on the upper side of the transport roller 11 and is disposed on the plate surface of the correction plate 24 facing the middle of the drive shaft 22.

[0067] The raised block 243 increases the contact area and limiting height with the edge of the cardboard, preventing the cardboard from slipping or tipping over during conveying or correction, especially for warped cardboard or high-speed conveying scenarios. The design of the raised block 243 located on the upper side of the conveyor roller 11 directly acts on the effective conveying area of ​​the cardboard, avoiding correction failure due to the point of action being too low. Compared with hard contact extrusion, the limiting method of the raised block 243 can disperse the force and reduce the risk of indentation or damage to the edge of the cardboard.

[0068] In some examples, the protrusion 243 can be fixedly connected to the correction plate 24, or it can be fixedly connected by bolts.

[0069] In some examples, the detection element is an infrared light curtain sensor. Infrared light curtain sensors can form a continuous detection area, enabling non-contact detection of the cardboard edge position. They offer fast response times (milliseconds) and are suitable for continuous high-speed cardboard conveying scenarios. Unaffected by cardboard color or surface roughness, they can stably detect the offset of different types of cardboard, avoiding detection errors caused by ambient light or dust.

[0070] In some examples, the infrared light curtain sensor can be a diffuse reflective sensor or other types of infrared sensors.

[0071] In some examples, the detection element also includes a CCD vision positioning system. The CCD vision positioning system can accurately identify minute deviations at the edge of the cardboard (with micrometer-level precision), making up for the shortcomings of infrared light curtain sensors in high-precision scenarios, and is suitable for processes such as fine printing and high-requirement warp detection.

[0072] In some examples, the detection element and the drive unit 23 are connected via PLC control. The PLC can quickly process the signals from the detection element 25 and accurately control the start, stop, speed and direction of the drive unit 23, avoiding response delays or operational errors caused by manual intervention. Through PLC programming, parameters such as the correction threshold and correction speed can be adjusted to adapt to different cardboard materials and conveying speeds, improving the versatility of the mechanism.

[0073] In some examples, mounting plates 13 extend from the main body 1 of the device in the direction of the conveyor roller 11. Multiple mounting plates 13 are provided and distributed at intervals. The guide shaft 21 and the drive shaft 22 are both mounted on the mounting plates 13. The mounting plates 13 provide multi-point support for the guide shaft 21 and the drive shaft 22, avoiding deflection deformation of the long shafts during operation and ensuring guiding accuracy and transmission stability.

[0074] In some examples, there are three mounting plates 13, which are located at both ends and the middle of the drive shaft 22, respectively. The drive component 23 is located on the outside of the mounting plate 13, and at least one end of the drive shaft 22 passes through the mounting plate 13.

[0075] The central mounting plate 13 effectively suppresses the central deflection of the drive shaft 22, avoiding a decrease in the accuracy of the threaded transmission due to shaft deformation, especially suitable for long drive shaft 22 scenarios; the drive component 23 is located on the outside of the mounting plate 13 to avoid interference with the conveying channel and the correction plate 24, while facilitating the inspection and maintenance of the drive component 23.

[0076] In some examples, a cardboard transfer and conveying correction mechanism 2 is mounted on the main body 1 of the equipment. The main body 1 can be made of Q235 steel plate welded into a cuboid frame structure. Three rectangular mounting plates 13 are integrally extended from the side of the main body 1 facing the transport roller 11. The three mounting plates 13 are evenly distributed along the length of the main body 1, with a spacing of 600mm between adjacent mounting plates 13. The mounting plates 13 are provided with precisely machined mounting holes, and the hole position accuracy is controlled within ±0.02mm.

[0077] The conveyor roller 11 mounted on the main body 1 is made of seamless steel pipe with a surface covered with a wear-resistant rubber layer of Shore hardness 65. Both ends are connected to the side wall of the main body 1 via rolling bearings, allowing for flexible rotation. The conveying surface 12 can be a polished 304 stainless steel plate, horizontally positioned below the conveyor roller 11, parallel to the axis of the conveyor roller 11, with a distance of 18mm between them, forming a cardboard conveying channel.

[0078] The guide shaft 21 is a cylindrical structure made of No. 45 steel. Its surface is heat-treated and chrome-plated for rust prevention. It is connected to the mounting holes of the three mounting plates 13 by interference fit. Both ends are locked with nuts. It is located directly below the transport roller 11 and parallel to the axis of the transport roller 11. The parallelism error is ≤0.03mm / m.

[0079] The drive shaft 22 can also be a cylindrical structure made of No. 45 steel. Its surface is machined with trapezoidal external threads of 30-degree tooth angle and 6mm pitch from the center to both ends. The left side of the center has a left-hand thread, and the right side has a right-hand thread. The thread accuracy grade is 6H. The drive shaft 22 is rotatably mounted on three mounting plates 13 via 6206-2RS deep groove ball bearings. The inner ring of the bearing is interference-fitted with the drive shaft 22, and the outer ring is transition-fitted with the mounting holes of the mounting plates 13. It is parallel to the guide shaft 21 at 90mm intervals, with a parallelism error ≤0.03mm / m. Its right end extends outward through the right mounting plate 13.

[0080] The drive unit 23 can be an MR-J2S-10A servo motor, which is fixed to the outside of the left mounting plate 13 with four bolts, and a rubber shock-absorbing pad is added to the fixing surface. The output shaft of the drive unit 23 can be connected to the right extension of the transmission shaft 22 through a coupling to ensure consistent speed.

[0081] The alignment plate 24 can be integrally extruded from 6061 aluminum alloy. Two plates are provided, symmetrically distributed relative to the center of the drive shaft 22, with an initial spacing 60mm wider than the largest size cardboard. The connecting part 241 of each alignment plate 24 is a rectangular plate with two through holes in the center. One is a smooth hole that has a clearance fit with the guide shaft 21; the other is an internal thread hole that matches the external thread of the drive shaft 22, forming a threaded drive.

[0082] The correction section 242 is a vertical plate perpendicular to the connecting section 241, extending 35mm above the conveyor roller 11 through the gap between the conveyor roller 11 and the conveying surface 12. A nitrile rubber buffer layer with a Shore hardness of 55 is bonded to the inner side of the correction section 242, and the surface has an anti-slip texture; it is bonded using acrylic adhesive. The protrusion 243 is a nitrile rubber block, bonded to the plate surface of the correction section 242 facing the middle of the drive shaft 22, with its upper half located above the conveyor roller 11 and flush with the upper edge of the correction section 242.

[0083] In the detection element 25, the infrared light curtain sensor can be a through-beam sensor. The transmitting end and the receiving end can be engineering plastic shells, which are fixed on the mounting plates 13 on both sides by L-shaped brackets and located 60mm above the conveyor roller 11. The axes of the transmitting end and the receiving end are on the same horizontal plane and perpendicular to the paperboard conveying direction to form a continuous infrared light curtain.

[0084] The CCD vision positioning system uses an industrial camera with a 16mm focal length lens and an aluminum alloy housing. It is fixed to the central mounting plate 13 via an adjustable bracket, with the lens facing the conveyor surface 12, and the shooting range covers the entire width of the cardboard. The detection element 25 can be connected to the PLC controller via a shielded cable. The PLC controller is fixed to the electrical mounting plate 13 inside the main body of the equipment 1, and is also connected to the drive unit 23 via a cable to form a control loop.

[0085] For example, the working process of this correction mechanism is as follows.

[0086] Initial preparation: After starting the equipment, the PLC controller controls the drive component 23 to reverse, driving the transmission shaft 22 to rotate. Since the threads on both sides of the transmission shaft 22 are opposite, the two correction plates 24 slide synchronously to both sides until the distance reaches the preset maximum width (60mm wider than the paperboard to be conveyed). The drive component 23 stops running, and the correction mechanism is in standby mode.

[0087] Paperboard conveying: The paperboard enters the channel between the conveyor roller 11 and the conveyor surface 12 through the feeding mechanism. The conveyor roller 11 rotates and drives the paperboard to move forward smoothly along the conveying direction. At this time, the detection element 25 starts to detect the position status of the paperboard in real time.

[0088] Offset detection: If the cardboard remains at the preset center position and the offset does not exceed ±0.5mm, the PLC controller determines that no correction is needed, the cardboard continues to be conveyed normally, and the correction mechanism remains on standby.

[0089] Correction Initiation: When the cardboard shifts in width, and the detection element 25 detects an offset exceeding ±0.5mm, it immediately transmits the offset direction (left or right) and offset amount data to the PLC controller. The controller quickly processes the data and generates control commands: if the cardboard shifts to the left, the controller commands the drive component 23 to rotate forward; if the cardboard shifts to the right, the controller commands the drive component 23 to rotate in reverse. Simultaneously, the controller adjusts the rotational speed of the drive component 23 according to the offset (the larger the offset, the higher the rotational speed; the maximum rotational speed does not exceed 1000rpm to avoid excessively rapid correction that could damage the cardboard).

[0090] Centering and Correction: The drive unit 23 starts and runs according to the command, driving the transmission shaft 22 to rotate via the synchronous belt. Since the threads on both sides of the transmission shaft 22 are in opposite directions, and the two correction plates 24 are connected to the transmission shaft 22 via ball screw transmission, the two correction plates 24 slide synchronously towards the center when the transmission shaft 22 rotates. The correction part 242 of the correction plate 24 extends above the transport roller 11, and its inner rubber buffer layer adheres to both sides of the cardboard edge, applying a uniform thrust to the cardboard during sliding, pushing the cardboard towards the center reference position. At the same time, the protrusions 243 on the correction plate 24 adhere to the upper edge of the cardboard, playing a limiting role and preventing the cardboard from slipping upwards or tilting during the correction process.

[0091] Correction complete: The detection element 25 continuously monitors the cardboard position. When the detected offset is less than ±0.5mm and remains stable for more than 0.5 seconds, it determines that the cardboard has returned to the preset center position, and the detection element 25 sends a correction complete signal to the PLC controller. After receiving the signal, the controller instructs the drive unit 23 to stop running, and the two correction plates 24 maintain their current positions and no longer move.

[0092] Continuous feeding: The cardboard continues to move forward along the feeding direction and enters the subsequent printing or warpage detection process. The detection element 25 continues to monitor in real time. If the deviation occurs again, the above correction steps are repeated to ensure that the cardboard stays in the precise center position throughout the process.

[0093] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cardboard transfer and conveying correction mechanism, disposed on a main body of equipment, wherein the main body of equipment is provided with transport rollers and a conveying surface, the transport rollers and the conveying surface being spaced apart, characterized in that, The cardboard transfer and conveying correction mechanism includes: A guide shaft is fixedly mounted on the main body of the equipment. The guide shaft is located below the conveyor roller and is distributed parallel to the conveyor roller. A drive shaft is rotatably mounted on the main body of the equipment. The guide shaft is located below the conveyor roller and is distributed parallel to the conveyor roller. The drive shaft and the guide shaft are spaced apart. A driving component is fixedly disposed at one end of the guide shaft, and the driving component is connected to the transmission shaft in a driving connection. The alignment plate includes an integrally formed connecting part and an alignment part. The connecting part is drivenly connected to the drive shaft and slidably connected to the guide shaft. The alignment part passes through the gap between the transport roller and the conveying surface and extends above the transport roller. Two alignment plates are provided, and the two alignment plates are distributed at intervals. The distance between the two alignment plates is greater than the width of the cardboard. A detection element is disposed on the main body of the equipment. The detection element is located above the transport roller. The detection element is used to inspect the state of the paperboard. The detection element is controlled and connected to the drive component.

2. The cardboard transfer and conveying correction mechanism according to claim 1, characterized in that, The drive shaft is connected to the straightening plate via a threaded connection, and the drive shaft is provided with an external thread for driving the straightening plate to move.

3. The cardboard transfer and conveying correction mechanism according to claim 2, characterized in that, From the middle of the drive shaft to both ends, the two parts of the drive shaft have the same thread but opposite directions, and the two straightening plates are symmetrically distributed with respect to the middle of the drive shaft.

4. The cardboard transfer and conveying correction mechanism according to claim 1, characterized in that, The correction plate also includes a protrusion, which is fixedly connected to the correction part. The protrusion is at least partially disposed on the upper side of the transport roller and is disposed on the plate surface of the correction plate facing the middle of the drive shaft.

5. The cardboard transfer and conveying correction mechanism according to any one of claims 1 to 4, characterized in that, The detection element is an infrared light curtain sensor.

6. The cardboard transfer and conveying correction mechanism according to claim 5, characterized in that, The detection element also includes a CCD vision positioning system.

7. The cardboard transfer and conveying correction mechanism according to claim 5, characterized in that, The detection element and the driving element are connected via PLC control.

8. The cardboard transfer and conveying correction mechanism according to claim 1, characterized in that, The main body of the equipment extends in the direction of the conveyor roller to form a mounting plate. Multiple mounting plates are provided and distributed at intervals. The guide shaft and the transmission shaft are both disposed on the mounting plate.

9. The cardboard transfer and conveying correction mechanism according to claim 8, characterized in that, The mounting plates are configured as three, and the three mounting plates are respectively located at both ends and the middle of the drive shaft. The drive component is disposed on the outside of the mounting plates, and at least one end of the drive shaft passes through the mounting plates.

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