A device for detecting and marking surface impurities of water-absorbing paper

Abstract

The application provides a water-absorbing paper surface impurity detection and marking processing device. Through double detection of a first detection assembly and a second detection assembly, an industrial camera is used to collect water-absorbing paper surface image information and transmit the information to a control box for automatic identification, thereby getting rid of the dependence on subjective factors of detection personnel, effectively avoiding the impurity missed detection and misjudgment caused by visual fatigue and attention dispersion, and greatly improving the accuracy and stability of impurity detection. At the same time, the detected impurities can be adsorbed and removed through a de-impurity assembly, without manual cleaning throughout, thereby significantly improving the de-impurity effect and efficiency and effectively reducing the effective manual labor intensity. In addition, the residual impurities remaining after re-inspection can be positioned and marked through a marking assembly, so that the subsequent process can quickly identify and remove the unqualified area, thereby solving the problem that the traditional manual detection cannot position and mark the defect position of the high-speed moving water-absorbing paper.

Description

Technical Field

[0001] This application relates to the technical field of absorbent paper production and testing equipment, and in particular to a device for detecting and marking impurities on the surface of absorbent paper. Background Technology

[0002] Absorbent paper is a special paper material with high capillary adsorption capacity and rapid water absorption performance. It is widely used in many fields such as medical care, food contact packaging, and hygiene products. During the production process of absorbent paper, solid impurities are easily generated on the surface of absorbent paper due to factors such as foreign matter remaining in the raw material pulp and debris falling off the production equipment. The existing technology has the following problems: Currently, the industry mostly relies on manual online inspection to detect impurities and defects in the production process of absorbent paper. This method is not only greatly affected by subjective factors such as the inspector's work experience, visual state, and sense of responsibility, but is also prone to missed or false detections due to visual fatigue and distraction caused by long hours of work. At the same time, since absorbent paper is in a continuous high-speed conveying state during the production process, even if the inspector visually identifies impurities and defects, it is difficult to accurately locate and mark the defect position for subsequent traceability. The defect position is easily lost as the substrate moves, making it impossible to handle accurately. This results in the overall inspection operation being time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0003] The purpose of this invention is to provide a device for detecting and marking impurities on the surface of absorbent paper in order to solve the above-mentioned problems.

[0004] The technical solution of this application is implemented as follows: This application provides a device for detecting and marking impurities on the surface of absorbent paper, including a frame, a worktable fixedly installed at the top of the frame, and an unwinding roller, a traction roller and a winding roller arranged sequentially at the top of the worktable along the conveying direction of the absorbent paper. A control box is fixedly installed on the outside of the frame. The top of the workbench is also provided with a first detection component, a dirt removal component, a second detection component and a marking component in sequence along the direction of the absorbent paper conveying. The first detection component, the dirt removal component, the second detection component and the marking component all span the surface of the absorbent paper and are electrically connected to the control box. The first detection component includes a first support frame, which is symmetrically fixedly installed on the top of the workbench. A first mounting frame is mounted on the top of the first support frame, and at least one set of industrial cameras is fixedly installed on the bottom of the first mounting frame. The industrial cameras are electrically connected to the control box. The impurity removal component includes a second support frame, which is symmetrically fixedly installed on the top of the workbench. A second mounting bracket is mounted on the top of the second support frame. A docking plate is fixedly installed on the side of the second support frame facing the first detection component. A transmission screw is provided between the two sets of docking plates. One end of the transmission screw is rotatably connected to the inner side of one set of docking plates, and the other end passes through the other set of docking plates. A first motor is fixedly installed on the outer wall of the docking plate on this side. The transmission screw is fixedly connected to the output end of the first motor. A threaded connector is threaded on the outer side of the transmission screw. A fixing plate is fixedly installed on the side of the threaded connector facing the first detection component. A first push rod is fixedly installed on the top of the fixing plate. The output end of the first push rod passes downward through the fixing plate and is fixedly installed on an adapter plate. Connecting rods are symmetrically installed on the bottom of the adapter plate, and a through plate is fixedly connected through the connecting rods. A negative pressure suction nozzle is fixedly installed on the top of the through plate, avoiding the connection position of the connecting rod. The bottom of the negative pressure suction nozzle passes through the through plate and is suspended directly above the absorbent paper. A negative pressure air source is externally connected to the top of the negative pressure suction nozzle. Both the first motor and the first push rod are electrically connected to the control box; The marking component includes a third support frame, which is symmetrically fixedly installed on the top of the workbench. A third mounting frame is mounted on the top of the third support frame. Mounting plates and second motors are respectively fixedly installed on the upper half of the two sets of third support frames facing the second detection component. A first pulley is fixedly installed on the output end of the second motor. A second pulley is rotatably installed on the mounting plate facing the second detection component. A transmission belt is sleeved on the outer side of the first pulley and the second pulley. A clamping block is fixedly connected to the outer side of the transmission belt. A second push rod is fixedly installed on the clamping block facing the second detection component. A bearing plate is fixedly connected to the output end of the second push rod. A label suction nozzle is fixedly installed on the top of the bearing plate, avoiding the connection position of the second push rod. The bottom of the label suction nozzle passes through the bearing plate and is suspended above the workbench. An air source is connected to the top of the label suction nozzle. A label-tearing machine is fixedly installed on the lower half of the third support frame; The second motor, the second push rod, and the label-tearing machine are all electrically connected to the control box.

[0005] In one implementation, the first detection component and the second detection component have the same structure.

[0006] In one embodiment, a sliding rod is fixed across the two sets of the third support frames, and the clamping block is slidably sleeved on the outside of the sliding rod, with the sliding sleeve position of the clamping block and the sliding rod avoiding the fixed connection position with the transmission belt.

[0007] In one embodiment, the label dispensing end of the label tearing machine and the label suction nozzle are on the same horizontal axis.

[0008] In one embodiment, a connecting plate is fixedly installed on the side of the threaded connector facing away from the first detection component, and sliders are symmetrically installed at the upper and lower ends of the threaded connector on the side of the connecting plate facing the first detection component. Guide rods are symmetrically fixedly installed between the two sets of docking plates and on the upper and lower sides of the transmission screw, and the slider is slidably sleeved on the outside of the guide rods.

[0009] In one embodiment, a scraper is fixedly installed at the bottom of the insertion plate, avoiding the insertion position of the negative pressure suction nozzle.

[0010] In one embodiment, the lower surface of the scraper is arranged with flexible bristles.

[0011] In one embodiment, the scraper has a concave arc-shaped plate structure, with the concave surface of the scraper facing the side of the first detection component.

[0012] The advantages or beneficial effects of the above technical solutions include at least the following: This application discloses a device for detecting and marking impurities on the surface of absorbent paper. Through dual detection by a first and second detection component, an industrial camera captures image information of the absorbent paper surface and transmits it to a control box for automatic identification. This eliminates reliance on the subjective factors of the inspectors, effectively avoiding missed or false detections of impurities caused by visual fatigue and distraction, significantly improving the accuracy and stability of impurity detection. Simultaneously, the impurity removal component adsorbs and removes detected impurities, eliminating the need for manual cleaning throughout the process, significantly improving the impurity removal effect and efficiency, and effectively reducing the intensity of manual labor. Furthermore, the marking component can locate and mark residual impurities remaining after re-inspection, facilitating rapid identification and removal of non-conforming areas in subsequent processes. This solves the problem that traditional manual inspection cannot locate, mark, and trace the defective positions of rapidly moving absorbent paper. Attached Figure Description

[0013] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the description thereof, serve to explain the principles of the present application. These drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification.

[0014] Figure 1 A schematic diagram of the overall structure of an embodiment of this application is shown; Figure 2 A schematic diagram of the structure of the first detection component according to an embodiment of this application is shown; Figure 3 A schematic diagram of the structure of the impurity removal component according to an embodiment of this application is shown; Figure 4 A structural schematic diagram of the connecting plate, slider, and guide rod according to an embodiment of this application is provided; Figure 5 A schematic diagram of the negative pressure suction nozzle, scraper, and bristles according to an embodiment of this application is provided; Figure 6 A schematic diagram of the structure of the marking component according to an embodiment of this application is shown; Figure 7 An enlarged structural schematic diagram of the marking component according to an embodiment of this application is shown; Figure 8 A schematic diagram of the scraper structure according to an embodiment of this application is shown; Reference numerals: Frame-10, Worktable-20, Unwind Roller-30, Traction Roller-40, Rewind Roller-50, Control Box-60, First Detection Component-70, Second Detection Component-71, First Support Frame-701, First Mounting Frame-702, Industrial Camera-73, Impurity Removal Component-80, Second Support Frame-801, Second Mounting Frame-802, Connecting Plate-803, Transmission Screw-804, First Motor-805, Threaded Connector-806, Connecting Plate-8061, Slider-8062, Guide Rod-8063, Fixing Plate-807, First push rod-808, Adapter plate-809, Connecting rod-810, Through plate-811, Negative pressure suction nozzle-812, Scraper-813, Brush-8131, Marking assembly-90, Third support frame-901, Third mounting frame-902, Mounting plate-903, Second motor-904, First pulley-905, Second pulley-906, Transmission belt-907, Clamping block-908, Sliding rod-9081, Second push rod-909, Bearing plate-910, Label suction nozzle-911, Label tearing machine-912. Detailed Implementation

[0015] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0016] It should be noted that, where there is no conflict, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0018] It should be noted that the terms "a" and "several" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0019] The names of the messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0020] Reference Figure 1 A device for detecting and marking impurities on the surface of absorbent paper includes a frame 10, with a worktable 20 fixedly installed at the top of the frame 10. The frame 10 provides stable support for the installation of various components, and the worktable 20 provides a working platform for the conveying and detection of absorbent paper.

[0021] The top of the workbench 20 is arranged with an unwinding roller 30, a traction roller 40, and a take-up roller 50 in sequence along the direction of the absorbent paper conveying. The absorbent paper is wound on the unwinding roller 30 in the form of a roll. Its free end is led out from the unwinding roller 30 and laid flat on the upper surface of the workbench 20. After being tensioned and adhered by the outer circumference of the traction roller 40, it is finally wound and fixed on the take-up roller 50. During operation, the unwinding roller 30 releases the absorbent paper substrate at a uniform speed, the traction roller 40 provides the main conveying traction force and controls the tension of the absorbent paper, and the take-up roller 50 simultaneously winds the absorbent paper that has completed the inspection and processing into a finished roll. The three work together to achieve continuous, uniform, and stable conveying of the absorbent paper from the feed end to the discharge end.

[0022] A control box 60 is fixedly installed on the outside of the frame 10. The control box 60 is a mature industrial programmable logic controller in the prior art. In this embodiment, the Siemens S7-200SMARTSR40 model PLC is selected. This model has sufficient digital input and output interfaces and high-speed pulse output capability. It can stably receive the image detection signals transmitted by the first detection component 70 and the second detection component 71 and perform fast logic operations. According to the operation results, it synchronously controls the movement and action execution of the impurity removal component 80 and the marking component 90, so as to realize the automated linkage control of the initial inspection triggering impurity removal and the re-inspection triggering marking.

[0023] In one embodiment, reference is made to Figure 1 The top of the workbench 20 is also provided with a first detection component 70, a dirt removal component 80, a second detection component 71 and a marking component 90 in sequence along the direction of the absorbent paper conveying. The first detection component 70, the dirt removal component 80, the second detection component 71 and the marking component 90 all span the surface of the absorbent paper and are electrically connected to the control box 60. The first detection component 70 is used to perform the first surface impurity detection on the absorbent paper conveyed below it, and to collect image information of the surface of the absorbent paper in real time and transmit it to the control box 60. After identifying the location and size of the impurities, it sends the corresponding impurity removal trigger signal to the control box 60. The first detection component 70 and the second detection component 71 have the same structure. The unified structural design can simplify the later maintenance and spare parts management of the equipment, as well as simplify the design and debugging of the control system.

[0024] The impurity removal component 80 is used to receive the impurity removal signal sent by the control box 60, and moves to the corresponding station according to the impurity position identified by the first detection component 70 to remove the impurities on the surface of the absorbent paper by negative pressure adsorption.

[0025] The second detection component 71 is used to perform a second inspection on the absorbent paper after the impurity removal treatment. It collects image information of the surface of the absorbent paper again and transmits it to the control box 60 to confirm whether the impurities have been completely removed. If residual impurities are detected, a marker trigger signal is sent to the control box 60.

[0026] The marking component 90 is used to receive the marking signal sent by the control box 60, and moves to the corresponding station according to the location of residual impurities identified by the second detection component 71, and marks the defective area on the surface of the absorbent paper with a label, so that the unqualified area can be identified and removed in subsequent processes.

[0027] In one embodiment, reference is made to Figure 2The first detection component 70 includes a first support frame 701, which is symmetrically fixedly installed on the top of the workbench 20. The first support frame 701 spans both sides of the absorbent paper conveying path in a symmetrical arrangement, providing a bearing base for the first mounting frame 702, ensuring the parallelism between the first mounting frame 702 and the upper surface of the workbench 20, thereby ensuring the imaging effect of the industrial camera 73.

[0028] The first support frame 701 is topped with a first mounting frame 702. The length of the first mounting frame 702 covers the conveying width of the absorbent paper, which can provide a unified installation benchmark for multiple industrial cameras 73, ensuring that the detection fields of each industrial camera 73 can be seamlessly spliced, and realizing blind-spot-free detection of the entire absorbent paper.

[0029] At least one set of industrial cameras 73 are fixedly installed at the bottom of the first mounting bracket 702. The industrial cameras 73 are electrically connected to the control box 60. In this embodiment, the industrial camera 73 is a Hikvision MV-CA013-20GC global shutter industrial camera, which can clearly and efficiently collect image data of the surface of the absorbent paper and transmit it to the control box 60, providing data support for subsequent impurity identification and impurity removal. In this embodiment, the industrial camera 73 is configured with two sets. This number of sets ensures that its detection range covers the conveying width of the absorbent paper, reducing the occurrence of missed detections.

[0030] In one embodiment, reference is made to Figures 3-5 The impurity removal component 80 includes a second support frame 801, which provides a stable bearing base for the second mounting frame 802 and ensures the parallelism between the second mounting frame 802 and the upper surface of the workbench 20. The second support frame 801 is symmetrically fixedly installed on the top of the workbench 20. The second support frame 801 is supported on the top of the second mounting frame 802. The length of the second mounting frame 802 covers the entire conveying width of the absorbent paper, providing a mounting base for the transmission screw 804 and the first motor 805, ensuring that the negative pressure suction nozzle 812 can move and be positioned within the lateral width range of the absorbent paper.

[0031] The second support frame 801 has a docking plate 803 fixedly installed on the side facing the first detection component 70. The docking plate 803 serves as a mounting component, providing rotational support for the transmission screw 804 and a stable mounting carrier for the first motor 805.

[0032] A transmission screw 804 is provided between the two sets of docking plates 803. The transmission screw 804 can convert the rotational motion output by the first motor 805 into the linear reciprocating motion of the threaded connector 806, thereby driving the negative pressure suction nozzle 812 to move along the width direction of the absorbent paper to the position corresponding to the impurities.

[0033] One end of the transmission screw 804 is rotatably connected to the inner side of one set of docking plates 803, and the other end passes through another set of docking plates 803. A first motor 805 is fixedly installed on the outer wall of the docking plate 803 on this side. The transmission screw 804 is fixedly connected to the output end of the first motor 805. The first motor 805 is a two-phase stepper motor, which can cooperate with the high-speed pulse signal output by the control box 60 to realize angle control and speed adjustment, thereby driving the transmission screw 804 to complete the lateral positioning of the negative pressure suction nozzle 812.

[0034] The transmission screw 804 has a threaded connector 806 on its outer side. The threaded connector 806 engages with the transmission screw 804 through its internal thread, converting the rotational motion of the transmission screw 804 into its own linear motion, and synchronously transmitting this motion to the fixed plate 807.

[0035] A fixing plate 807 is fixedly installed on the threaded connector 806 facing the first detection component 70. The fixing plate 807 is used to provide an installation base for the first push rod 808. At the same time, it can move laterally in sync with the threaded connector 806, thereby driving the first push rod 808 and the negative pressure suction nozzle 812 to complete the lateral position adjustment.

[0036] A first push rod 808 is fixedly installed on the top of the fixed plate 807. The first push rod 808 can receive the control signal from the control box 60, thereby driving the negative pressure suction nozzle 812 to move vertically up and down, so that the negative pressure suction nozzle 812 descends to a suitable adsorption height during the adsorption and adsorption of impurities. After the adsorption and adsorption of impurities are completed, it will automatically rise and reset to avoid friction with the absorbent paper. When the first push rod 808 reaches the bottom dead center, a safe air gap of 1.5mm to 3.0mm is always maintained between the negative pressure suction nozzle 812 and the surface of the absorbent paper.

[0037] The output end of the first push rod 808 passes downward through the fixing plate 807 and is fixedly installed with the adapter plate 809. The adapter plate 809 serves as an intermediate connector to transmit the vertical thrust of the first push rod 808 to the connecting rod 810.

[0038] The bottom of the adapter plate 809 is symmetrically equipped with connecting rods 810. The connecting rods 810 are two sets of symmetrically arranged vertical rods. The two-point support connection method can effectively prevent the through plate 811 from tilting during lifting and moving, and ensure that the negative pressure suction nozzle 812 is always perpendicular to the surface of the absorbent paper.

[0039] The adapter plate 809 is fixedly connected to the through plate 811 via the connecting rod 810. The through plate 811 is used to provide an installation carrier for the negative pressure suction nozzle 812. At the same time, it can be raised and lowered synchronously with the first push rod 808 to drive the negative pressure suction nozzle 812 to complete the vertical position adjustment.

[0040] A negative pressure suction nozzle 812 is fixedly installed at the top of the through plate 811, avoiding the connection position of the connecting rod 810. The bottom of the negative pressure suction nozzle 812 passes through the through plate 811 and is suspended directly above the absorbent paper. The top of the negative pressure suction nozzle 812 is connected to a negative pressure air source. When the negative pressure suction nozzle 812 moves laterally to the set air gap height, the control box 60 triggers the vacuum generator to instantly turn on the negative pressure. The instantaneous negative pressure suction adsorbs and carries away solid impurities on the surface of the absorbent paper. After the impurity removal operation is completed, the negative pressure is immediately turned off. In this embodiment, the external air source for the negative pressure suction nozzle 812 is specifically selected as an Airtac X-KZH05BS-06 integrated vacuum generator. It is connected to the control box 60 for millisecond-level start and stop control, outputting a low negative pressure suction of -0.02MPa to -0.03MPa. This suction can only adsorb loose solid impurities attached to the surface of the absorbent paper. With the instantaneous start and stop logic, it will not produce a continuous adsorption and pulling effect on the absorbent paper substrate itself, effectively avoiding the problems of absorbent paper being damaged, wrinkled or sucked up.

[0041] Both the first motor 805 and the first push rod 808 are electrically connected to the control box 60.

[0042] In one embodiment, reference is made to Figures 6-7 The marking component 90 includes a third support frame 901, which is symmetrically fixedly installed on the top of the workbench 20. The third support frame 901 spans both sides of the absorbent paper conveying path in a symmetrical arrangement, providing a stable bearing foundation for the third mounting frame 902 above.

[0043] The third support frame 901 has a third mounting frame 902 on top, which provides a flat mounting carrier for the mounting plate 903 and the second motor 904, ensuring that the label suction nozzle 911 can move and be positioned within the entire horizontal width of the absorbent paper.

[0044] Two sets of third support frames 901 are respectively fixedly mounted with mounting plates 903 and second motors 904 on the upper half of the side facing the second detection component 71. The mounting plates 903 are used to provide rotational support for the second pulley 906, ensuring the coaxiality and parallelism of the second pulley 906 and the first pulley 905. The second motor 904 is the same as the first motor 805, both of which are two-phase stepper motors. When the second detection component 71 detects residual defects on the surface of the absorbent paper that have not been removed, it will transmit the lateral position coordinate signal of the defect to the control box 60. After processing the position signal, the control box 60 generates a motion command including the rotation direction, number of rotation steps and rotation speed and sends it to the second motor 904. The second motor 904 executes the rotation action according to the received command, providing stable power for the subsequent lateral movement of the label nozzle 911.

[0045] The output end of the second motor 904 is fixedly mounted with a first pulley 905, and the mounting plate 903 is rotatably mounted with a second pulley 906 facing the second detection component 71. The first pulley 905 and the second pulley 906 are both fitted with a transmission belt 907. The first pulley 905 is fixedly mounted as the driving pulley at the output end of the second motor 904. The second pulley 906 is the driven pulley and works with the first pulley 905 to tension the transmission belt 907. During operation, the first pulley 905 rotates synchronously with the second motor 904, and drives the second pulley 906 to rotate synchronously through the transmission belt 907, thereby causing the transmission belt 907 to generate linear motion, which drives the clamping block 908 to move linearly back and forth along the width direction of the absorbent paper.

[0046] A clamping block 908 is fixedly connected to the outside of the transmission belt 907. The clamping block 908 acts as a fixing member and can move laterally synchronously with the transmission belt 907, and transmits the motion synchronously to the second push rod 909, the bearing plate 910 and the label suction nozzle 911.

[0047] A second push rod 909 is fixedly installed on the clamping block 908 facing the second detection component 71. The second push rod 909 is used to receive the control signal from the control box 60 and drive the label suction nozzle 911 to perform vertical lifting and lowering movements, so that the label suction nozzle 911 descends to the corresponding height when picking up and applying labels, and automatically rises and resets after the action is completed to avoid interference with the absorbent paper.

[0048] The output end of the second push rod 909 is fixedly connected to the support plate 910, which provides a stable installation reference for the label suction nozzle 911. At the same time, it can move vertically up and down synchronously with the second push rod 909, thereby driving the label suction nozzle 911 to complete the vertical position adjustment.

[0049] A label suction nozzle 911 is fixedly installed on the top of the support plate 910, avoiding the connection position of the second push rod 909. The bottom of the label suction nozzle 911 passes through the support plate 910 and is suspended above the worktable 20. The label suction nozzle 911 is specifically a sponge vacuum suction nozzle. When the label suction nozzle 911 moves to the label dispensing position of the label tearing machine, it uses negative pressure suction to adsorb the separated label, and then moves to the residual defect position to stick the label onto the surface of the absorbent paper, completing the defect marking operation. The top of the label suction nozzle 911 is connected to an external air source. In this embodiment, the external air source of the label suction nozzle 911 is the same model as the external air source of the negative pressure suction nozzle 812. It outputs a negative pressure suction of -0.05MPa to -0.06MPa only during the label adsorption and labeling action. It automatically shuts off immediately after labeling is completed to prevent the label suction nozzle 911 from tearing the freshly pasted label off the surface of the absorbent paper again when it rises and resets, or from lifting the thin and soft absorbent paper substrate.

[0050] A label peeling machine 912 is fixedly installed on the lower half of the third support frame 901. The label peeling machine 912 is a mature automatic self-adhesive label peeling device in the existing technology. It is responsible for loading rolls of self-adhesive label tape. When the control box 60 triggers the marking command, the label peeling machine 912 automatically peels the individual labels from the backing paper in advance and pushes them to the label dispensing position, waiting for the label suction nozzle 911 to come and absorb the labels, providing a continuous supply of labels for the marking operation. In this design, the label dispensing end of the label peeling machine 912 and the label suction nozzle 911 are on the same horizontal axis. This design allows the label suction nozzle 911 to be aligned with the label center without vertical position adjustment when it moves to the label picking position, avoiding the problem of label offset or skew during label adsorption. At the same time, it simplifies the motion control logic of the control system. The label suction nozzle 911 only needs to complete two actions, horizontal movement and vertical lifting, to complete label picking and labeling, reducing the motion path and control complexity, and improving the efficiency and reliability of the labeling operation.

[0051] The second motor 904, the second push rod 909, and the label tearing machine 912 are all electrically connected to the control box 60.

[0052] In one embodiment, reference is made to Figures 6-7 A sliding rod 9081 is fixed across the two sets of third support frames 901. The clamping block 908 is slidably sleeved on the outside of the sliding rod 9081, and the sliding sleeve position of the clamping block 908 and the sliding rod 9081 avoids the fixed connection position with the transmission belt 907. The sliding rod 9081 is used to provide rigid linear guidance for the clamping block 908, effectively preventing the clamping block 908 from swaying left and right, jumping up and down or shifting angle during lateral movement, and ensuring the straightness and positional accuracy of the label suction nozzle 911 movement trajectory.

[0053] In one embodiment, reference is made to Figure 4 A connecting plate 8061 is fixedly installed on the side of the threaded connector 806 facing away from the first detection component 70. The connecting plate 8061 serves as a connector to provide a stable mounting carrier for the upper and lower sets of sliders 8062 and to ensure that the guiding force generated by the sliding cooperation between the slider 8062 and the guide rod 8063 can be transmitted to the threaded connector 806.

[0054] Slider 8062 is symmetrically installed at the upper and lower ends of the threaded connector 806 on the side of the connecting plate 8061 facing the first detection component 70. Guide rods 8063 are symmetrically fixedly installed between the two sets of docking plates 803 and on the upper and lower sides of the transmission screw 804. The slider 8062 is slidably sleeved on the outside of the guide rod 8063. The guide rod 8063 provides rigid linear guidance for the threaded connector 806 through sliding cooperation with the slider 8062, preventing the threaded connector 806 from rotating with the transmission screw 804. At the same time, it effectively suppresses the up-and-down jumping and left-and-right swaying of the threaded connector 806 during the movement, significantly improving the moving accuracy and running stability of the negative pressure suction nozzle 812.

[0055] The slider 8062, located on the side opposite to the connecting plate 8061, can be fixedly connected to the fixing plate 807, effectively eliminating the slight shaking of the fixing plate 807 during high-speed movement and start-stop process, making the movement trajectory of the negative pressure suction nozzle 812 more stable and the positioning accuracy higher.

[0056] In one embodiment, reference is made to Figure 8 A scraper 813 is fixedly installed at the bottom of the through plate 811, avoiding the through position of the negative pressure suction nozzle 812. After the scraper 813 descends synchronously with the negative pressure suction nozzle 812, the bottom of the scraper 813 remains suspended from the surface of the absorbent paper. Through its own structure, it blocks the impurities protruding on the surface of the absorbent paper, making it easier for the negative pressure suction nozzle 812 to adsorb them, thus significantly improving the impurity removal effect and the thoroughness of impurity removal. Among them, the lower surface of the scraper 813 is arranged with flexible bristles 8131. The flexible bristles 8131 can penetrate into the tiny depressions and fiber gaps on the surface of the absorbent paper without scratching the thin absorbent paper substrate, sweeping out the fine impurities that the scraper 813 cannot reach, and further improving the impurity removal effect. The scraper 813 has a concave arc-shaped plate structure, with the concave surface of the scraper 813 facing the first detection component 70. This structure can gather the blocked or loosened impurities towards the arc-shaped central area when the scraper moves laterally with the negative pressure suction nozzle 812, effectively preventing impurities from escaping from both sides of the scraper, and making the impurities more concentrated in the adsorption area directly below the negative pressure suction nozzle 812, thus greatly improving the adsorption efficiency of impurities.

[0057] Working principle: During operation, the unwinding roller 30 releases the absorbent paper substrate at a uniform speed, the traction roller 40 provides the main conveying traction force and controls the tightness of the absorbent paper, and the winding roller 50 simultaneously winds the processed absorbent paper into a finished roll. The three work together to achieve continuous, uniform and stable conveying of the absorbent paper along the direction from the feed end to the discharge end. When the absorbent paper is conveyed to the area below the first detection component 70, the industrial camera 73 at the bottom of the first mounting bracket 702 collects real-time image information of the absorbent paper surface and transmits it to the control box 60. After identifying the location and size of the impurity, the control box 60 sends an impurity removal trigger signal to the impurity removal component 80. The first motor 805 then drives the transmission screw 804 to rotate, which in turn drives the fixing plate 807, the first push rod 808, and the negative pressure suction nozzle 812 to move laterally through the threaded connector 806. The slider 8062 connected to the threaded connector 8061 slides along the guide rod 8063 to prevent rotation and ensure smooth movement. When the negative pressure suction nozzle 812 moves laterally to the vertical position where the impurity is located... When the impurity moves along the trajectory line and reaches directly below the negative pressure suction nozzle 812, the first push rod 808 drives the through plate 811 and the negative pressure suction nozzle 812 to descend to the set safe air gap height. The control box 60 triggers the integrated vacuum generator to instantly turn on the negative pressure. The solid impurities on the surface of the absorbent paper are adsorbed and carried away by the instantaneous negative pressure suction. At the same time, the scraper 813 at the bottom of the through plate 811 descends synchronously with the negative pressure suction nozzle 812. The flexible bristles 8131 on its lower surface sweep out the fine impurities and use the concave arc structure to gather the impurities towards the center directly below the negative pressure suction nozzle 812. After the impurity removal is completed, the negative pressure is immediately turned off, and the first push rod 808 drives the negative pressure suction nozzle 812 to rise and reset. After impurity removal, the absorbent paper continues to be conveyed to the second detection component 71 for secondary inspection. The second detection component 71 again acquires image information and transmits it to the control box 60. If it is confirmed that the impurities have been completely removed, no action is triggered. If residual impurities are detected, a marking trigger signal is sent to the marking component 90. The second motor 904 then drives the first pulley 905 to rotate, which in turn drives the clamping block 908, the second push rod 909, and the label suction nozzle 911 to move laterally via the transmission belt 907. The clamping block 908 slides along the sliding rod 9081 to ensure the straightness of the movement trajectory. When the label suction nozzle 911 reaches the label dispensing position of the label tearing machine 912, the label tearing machine 912 peels the individual label from the backing paper in advance and pushes it to the label suction nozzle. At the label dispensing end of the nozzle 911 on the same transverse axis, the second push rod 909 drives the support plate 910 and the label suction nozzle 911 of the sponge vacuum structure to descend. The control box 60 triggers the vacuum generator to open the negative pressure so that the label suction nozzle 911 can pick up the label. Then the second push rod 909 rises to reset. The label suction nozzle 911 moves laterally to the longitudinal trajectory line where the residual defect is located. When the residual defect runs to the bottom of the label suction nozzle 911, the second push rod 909 descends again to flatten the label onto the surface of the absorbent paper. After the label is applied, the negative pressure is immediately closed to prevent the label or absorbent paper from being lifted when the label suction nozzle 911 rises. The second push rod 909 rises to reset. Finally, the absorbent paper that has completed all the testing and processing is wound into a finished roll by the take-up roller 50.

[0058] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] Those skilled in the art should understand that the above embodiments are merely for illustrative purposes and are not intended to limit the scope of this application. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of this application.

Claims

1. A device for detecting and marking impurities on the surface of absorbent paper, comprising a frame (10), a worktable (20) fixedly installed at the top of the frame (10), and a unwinding roller (30), a traction roller (40) and a rewinding roller (50) arranged sequentially at the top of the worktable (20) along the absorbent paper conveying direction, and a control box (60) fixedly installed on the outside of the frame (10). Its features are: The top of the workbench (20) is also provided with a first detection component (70), a dirt removal component (80), a second detection component (71) and a marking component (90) in sequence along the direction of the absorbent paper conveying. The first detection component (70), the dirt removal component (80), the second detection component (71) and the marking component (90) all span the surface of the absorbent paper and are electrically connected to the control box (60). The first detection component (70) includes a first support frame (701), which is symmetrically fixedly installed on the top of the workbench (20). A first mounting frame (702) is mounted on the top of the first support frame (701), and at least one set of industrial cameras (73) is fixedly installed on the bottom of the first mounting frame (702). The industrial cameras (73) are electrically connected to the control box (60). The impurity removal component (80) includes a second support frame (801), which is symmetrically fixedly installed on the top of the workbench (20). A second mounting frame (802) is mounted on the top of the second support frame (801). A docking plate (803) is fixedly installed on the side of the second support frame (801) facing the first detection component (70). A transmission screw (804) is provided between the two sets of docking plates (803). One end of the transmission screw (804) is rotatably connected to the inner side of one set of docking plates (803), and the other end passes through the other set of docking plates (803). A first motor (805) is fixedly installed on the outer wall of the docking plate (803) on this side. The transmission screw (804) is fixedly connected to the output end of the first motor (805). The outer side of the transmission screw (804) is... A threaded connector (806) is provided, and a fixing plate (807) is fixedly installed on the side of the threaded connector (806) facing the first detection component (70). A first push rod (808) is fixedly installed on the top of the fixing plate (807). The output end of the first push rod (808) passes downward through the fixing plate (807) and is fixedly installed with an adapter plate (809). A connecting rod (810) is symmetrically installed on the bottom of the adapter plate (809), and a through plate (811) is fixedly connected through the connecting rod (810). A negative pressure suction nozzle (812) is fixedly installed on the top of the through plate (811) away from the connection position of the connecting rod (810). The bottom of the negative pressure suction nozzle (812) passes through the through plate (811) and is suspended directly above the absorbent paper. A negative pressure air source is connected to the top of the negative pressure suction nozzle (812). The first motor (805) and the first push rod (808) are both electrically connected to the control box (60); The marking component (90) includes a third support frame (901), which is symmetrically fixedly installed on the top of the workbench (20). A third mounting frame (902) is mounted on the top of the third support frame (901). Mounting plates (903) and second motors (904) are respectively fixedly installed on the upper half of the two sets of third support frames (901) facing the second detection component (71). A first pulley (905) is fixedly installed at the output end of the second motor (904). A second pulley (906) is rotatably installed on the mounting plate (903) facing the second detection component (71). The first pulley (905) is rotatably installed on the first pulley (906). 5) A transmission belt (907) is fitted together with the outer side of the second pulley (906). A clamping block (908) is fixedly connected to the outer side of the transmission belt (907). A second push rod (909) is fixedly installed on the clamping block (908) facing the second detection component (71). A bearing plate (910) is fixedly connected to the output end of the second push rod (909). A label suction nozzle (911) is fixedly installed on the top of the bearing plate (910) away from the connection position of the second push rod (909). The bottom of the label suction nozzle (911) passes through the bearing plate (910) and is suspended above the workbench (20). An air source is connected to the top of the label suction nozzle (911). A label-tearing machine (912) is fixedly installed on the lower half of the third support frame (901). The second motor (904), the second push rod (909), and the label tearing machine (912) are all electrically connected to the control box (60).

2. The device for detecting and marking impurities on the surface of absorbent paper according to claim 1, characterized in that: The first detection component (70) and the second detection component (71) have the same structure.

3. The device for detecting and marking impurities on the surface of absorbent paper according to claim 1, characterized in that: A sliding rod (9081) is fixed across the two sets of the third support frame (901). The clamping block (908) is slidably sleeved on the outside of the sliding rod (9081), and the sliding sleeve position of the clamping block (908) and the sliding rod (9081) avoids the fixed connection position with the transmission belt (907).

4. The device for detecting and marking impurities on the surface of absorbent paper according to claim 1, characterized in that: The label-dispensing end of the label-tearing machine (912) and the label suction nozzle (911) are on the same horizontal axis.

5. The device for detecting and marking impurities on the surface of absorbent paper according to claim 1, characterized in that: A connecting plate (8061) is fixedly installed on the side of the threaded connector (806) facing away from the first detection component (70). Slider blocks (8062) are symmetrically installed on the upper and lower ends of the threaded connector (806) on the side of the connecting plate (8061) facing the first detection component (70). Guide rods (8063) are symmetrically fixedly installed between the two sets of docking plates (803) and on the upper and lower sides of the transmission screw (804), and the slider (8062) is slidably sleeved on the outside of the guide rods (8063).

6. The apparatus for detecting and marking impurities on the surface of absorbent paper according to claim 1, characterized in that: A scraper (813) is fixedly installed at the bottom of the through plate (811) away from the through position of the negative pressure suction nozzle (812).

7. The apparatus for detecting and marking impurities on the surface of absorbent paper according to claim 6, characterized in that: The scraper (813) has flexible bristles (8131) arranged in an array on its lower surface.

8. The apparatus for detecting and marking impurities on the surface of absorbent paper according to claim 6, characterized in that: The scraper (813) has a concave arc-shaped plate structure, and the concave surface of the scraper (813) faces the side of the first detection component (70).

Images