A pipe ink code spraying automatic cleaning and re-spraying device and method

Abstract

The present application belongs to the technical field of pipe identification cleaning and changing, and discloses a pipe ink code spraying automatic cleaning and re-spraying device and method. The device comprises a device main body frame, a traction system, a cleaning system, a visual detection system, a code spraying system and a control system. The traction system is used for conveying the pipe; the cleaning system adopts a two-stage design of main cleaning and fine cleaning and drying, and the surface ink is completely removed through replaceable cleaning heads and automatic winding cleaning cloth; the visual detection system on-line monitors the cleaning effect and forms a closed loop feedback with the control system, and the pipe that does not meet the standard is automatically returned for re-cleaning; the code spraying system re-sprays the pipe surface after processing. The method can realize full-process automatic operation, has the advantages of stable cleaning quality, adaptation to multiple specifications of pipes, environmental protection, high efficiency, cost saving and the like, and effectively solves the problem of pipe code spraying error repair difficulty.

Description

Technical Field

[0001] This invention belongs to the field of pipe marking cleaning and alteration technology, and particularly relates to an automatic cleaning and re-marking device and method for pipe inkjet printing. Background Technology

[0002] In the manufacturing process of plastic pipes, to achieve product traceability, clear specifications, and compliance with industry standards, it is usually necessary to spray marking information such as brand, specifications, production date, and batch number on their outer wall. Currently, this is mostly achieved through inkjet printing technology. However, in production practice, printing errors frequently occur. For example, errors in the printed content (such as incorrect date or batch number), misaligned printing positions, or illegible printing. If these pipes with incorrect markings cannot be repaired, they can only be downgraded or even scrapped, resulting in a serious waste of raw materials and energy, and increasing production costs.

[0003] The ink markings on existing pipes cannot be cleaned with water and require the use of ink cleaning agents, which are generally organic solvents such as acetone. Most operators wipe them manually, and most organic solvents are irritating, volatile, and harmful to the health of the operators.

[0004] Patent number CN213261672U provides a device for secondary inkjet printing on pipes, but the device requires the assistance of multiple devices and cannot automatically identify the cleanliness of the pipes. The cleaning fluid is directly exposed to the air, and the operation and identification still largely rely on manual labor.

[0005] Therefore, existing technology lacks a dedicated device that can automatically, non-destructively, cleanly, and efficiently remove erroneous ink markings from pipe surfaces and re-mark them. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic cleaning and re-printing device and method for inkjet printing on pipes, so as to solve the above-mentioned technical problems.

[0007] To solve the above-mentioned technical problems, the specific technical solution of the automatic cleaning and re-inking device and method for inkjet printing on pipes according to the present invention is as follows:

[0008] An automatic cleaning and re-printing device for ink-jet printing on pipes includes:

[0009] Equipment main frame;

[0010] A traction system, located at the inlet and outlet ends of the main frame of the equipment, is used to clamp and transport the pipes to be cleaned.

[0011] A cleaning system, located inside the main frame of the equipment and between the traction systems, is used to remove ink markings from the surface of the pipe.

[0012] A visual inspection system is installed between the cleaning systems to detect the cleaning effect on the pipe surface online;

[0013] A coding system, positioned behind the vision inspection system, is used to apply coding to the cleaned pipe surface; and

[0014] The control system is electrically connected to the traction system, cleaning system, vision inspection system and coding system, and is used to control the coordinated operation of each system.

[0015] Furthermore, the cleaning system includes a first cleaning device and a second cleaning device arranged sequentially along the pipe conveying direction. The first cleaning device is used for main cleaning with ink cleaning agent, and the second cleaning device is used for fine cleaning and drying with residue-free cleaning agent.

[0016] Furthermore, both the No. 1 cleaning device and the No. 2 cleaning device include:

[0017] A liquid storage device for storing and supplying cleaning agents;

[0018] A replaceable cleaning head is detachably connected to the bottom of the liquid storage device, and its lower end is provided with a groove that matches the outer wall of the pipe.

[0019] A cleaning cloth, placed within the groove of the replaceable cleaning head, is used to contact and wipe the pipe surface; and

[0020] A winding machine is installed on both sides of the liquid storage device for winding up and unwinding the cleaning cloth.

[0021] Furthermore, the liquid storage device includes a liquid storage tank, a slidable sealing head disposed inside the liquid storage tank, and a first telescopic rod that drives the sealing head to move, thereby squeezing the cleaning agent from the liquid storage tank into the replaceable cleaning head through the movement of the first telescopic rod.

[0022] Furthermore, the traction system includes a traction machine and a traction machine opening height adjustment device. The traction machine includes an upper conveyor belt and a lower conveyor belt. The traction machine opening height adjustment device is used to adjust the distance between the upper and lower conveyor belts to accommodate pipes of different diameters.

[0023] Furthermore, the traction machine opening height adjustment device includes a lifting motor and a conveyor belt clamping mechanism. The lifting motor drives the conveyor belt clamping mechanism under the control of the control system to drive the upper conveyor belt to rise and fall.

[0024] Furthermore, it also includes a surface treatment system disposed between the vision inspection system and the coding system. The surface treatment system is a plasma generator used to activate the surface of the pipe to improve the adhesion of the coding.

[0025] Furthermore, the visual inspection system and the control system form a closed-loop control circuit. When the visual inspection system detects that the cleaning is not up to standard, the control system controls the traction system to reverse and return the pipe to the cleaning start position for re-cleaning.

[0026] The present invention also discloses an automatic cleaning and re-inking method for ink-jet printing on pipes based on the aforementioned device, comprising the following steps:

[0027] S1: Adjust the clamping distance of the traction system according to the diameter of the pipe to be cleaned, install the matching cleaning head and cleaning cloth, and supply cleaning agent to the cleaning system;

[0028] S2: Place the pipe to be cleaned into the traction system, and the system will automatically clamp and transport the pipe into the cleaning station;

[0029] S3: The cleaning head of the cleaning system comes into contact with the surface of the pipe and supplies cleaning agent, while continuously wiping and cleaning the surface of the pipe by rewinding the cleaning cloth.

[0030] S4: The cleaning effect is judged online by the visual inspection system. If the cleaning meets the standard, the pipe will enter the subsequent process; if the cleaning does not meet the standard, the system will alarm and control the traction system to return the pipe for cleaning again.

[0031] S5: Perform surface treatment on pipes that have passed the cleaning standards;

[0032] S6: Re-print the code onto the treated pipe surface according to the preset content.

[0033] Furthermore, the cleaning process in step S3 includes a main cleaning and a fine cleaning and drying step performed sequentially, using an ink cleaner and a residue-free cleaning agent, respectively.

[0034] The automatic cleaning and re-inking device and method for ink-jet printing on pipes according to the present invention has the following advantages:

[0035] 1. High degree of automation, significantly improving cleaning efficiency.

[0036] This invention achieves fully automated operation of the entire process from pipe feeding, cleaning, inspection, and re-marking through the integration and coordinated control of a traction system, cleaning system, vision inspection system, marking system, and control system. Compared with traditional manual cleaning methods, it not only significantly improves the consistency and efficiency of cleaning operations but also significantly reduces the reliance on operator skills and labor intensity, effectively enhancing production line processing capacity.

[0037] 2. Cleaning quality is stable and reliable, and the coding qualification rate is high.

[0038] The cleaning system employs a two-stage design: primary cleaning and fine cleaning / drying. Specialized ink cleaners and residue-free cleaning agents are used respectively, thoroughly removing various ink markings while avoiding solvent residue. A visual inspection system monitors the cleaning effect online in real time. Combined with the closed-loop feedback mechanism of the control system, pipes that fail to meet cleaning standards are automatically returned for re-cleaning. This ensures that the surface of each pipe meets cleanliness standards before re-marking, guaranteeing the adhesion and clarity of the re-marking and effectively improving the finished product pass rate.

[0039] 3. Highly adaptable, suitable for various pipe specifications.

[0040] The device is equipped with a traction machine opening height adjustment device and replaceable cleaning heads. The clamping distance can be easily adjusted and matching cleaning components replaced according to the diameter of the pipe to be cleaned, achieving rapid adaptation to pipes of different diameters and specifications. The inkjet printer height is also flexibly adjustable, enhancing the equipment's versatility and production line compatibility.

[0041] 4. Green and environmentally friendly, significantly improving the working environment.

[0042] The cleaning agent is circulated and supplied within a sealed storage tank and cleaning head, effectively reducing the evaporation and exposure of organic solvents, minimizing pollution to the operating environment, and reducing the impact of irritating odors on personnel health. The cleaning cloth can be continuously rolled up and replaced, avoiding the problem of repeated contamination in traditional wiping, further improving the cleanliness and environmental friendliness of the cleaning process.

[0043] 5. Easy to operate and low maintenance cost

[0044] The control system is integrated into the main control panel, with centralized management of parameter settings, process monitoring, and fault alarms, and a user-friendly human-machine interface. Key components such as the cleaning head feature a quick-replacement design, and the cleaning cloth is automatically retracted, reducing the difficulty and time cost of daily maintenance and contributing to the long-term stable operation of the equipment.

[0045] 6. Resource conservation and outstanding economic benefits

[0046] Automated cleaning and re-marking can efficiently repair pipes with incorrect markings, avoiding pipe downgrading or scrapping due to marking problems. This significantly saves raw materials and production costs, improves product utilization, and has obvious economic benefits and resource conservation significance. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the overall structure of the automatic cleaning and re-printing device for pipe inkjet printing according to the present invention.

[0048] Figure 2This is a schematic diagram of the traction system structure of the present invention;

[0049] Figure 3 This is a schematic diagram of the traction machine opening height adjustment device of the present invention;

[0050] Figure 4 This is a front structural diagram of the traction machine opening height adjustment device of the present invention;

[0051] Figure 5 This is a schematic diagram of the liquid storage device structure of the present invention;

[0052] Figure 6 This is a schematic diagram of the inkjet printer height adjustment device of the present invention;

[0053] Explanation of markings in the diagram: 1. Main frame of equipment; 2. Traction system; 3. Cleaning system; 4. Vision inspection system; 5. Surface treatment system; 6. Marking system; 7. Control system; 8. Pipes; 11. Casters; 21. Traction machine; 22. Traction machine opening height adjustment device; 23. Support frame; 31. Cleaning device No. 1; 32. Cleaning device No. 2; 311. Liquid storage device; 312. Cleaning cloth; 313. Winding machine; 3111. Liquid storage tank; 3112. Sliding sealing head; 3113. First telescopic rod; 311 4. Second telescopic rod; 3115. Third telescopic rod; 3116. Replaceable cleaning head; 61. Inkjet printer; 62. Inkjet printer control panel; 63. Inkjet printer height adjustment device; 631. Fixed base; 632. Vertical slide rail; 633. Lead screw; 634. Slider; 635. Manual turntable; 71. Equipment main control panel; 212. Lower conveyor belt; 211. Upper conveyor belt; 221. Traction machine housing; 222. Lifting motor; 223. Conveyor belt clamping mechanism; 224. Adjusting guide rail; 225. Infrared sensor. Detailed Implementation

[0054] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides an automatic cleaning and re-inking device and method for inkjet printing on pipes.

[0055] like Figure 1 As shown, an automatic cleaning and re-marking device for pipe inkjet printing according to the present invention includes: a main frame 1, a traction system 2, a cleaning system 3, a vision inspection system 4, a surface treatment system 5, a marking system 6, and a control system 7. The traction system 2 is located at both ends of the main frame 1; the cleaning system 3, vision inspection system 4, surface treatment system 5, and marking system 6 are sequentially arranged inside the main frame 1 along the pipe conveying direction; the control system 7 is fixed to the outside of the main frame 1. The main frame 1 has casters 11 at its bottom for easy overall movement and positioning.

[0056] The traction system 2 is used to clamp and transport the pipe 8 to be cleaned. For example... Figure 2 As shown, the traction system 2 includes a traction machine 21, a traction machine opening height adjustment device 22, and a support frame 23. The traction machine 21 is respectively installed at the inlet and outlet ends of the main frame 1 of the equipment and is fixed by the support frame 23. The height of the support frame 23 can be adjusted by a threaded rod to accommodate the conveying height of different pipe materials. The traction machine 21 adopts a double-layer conveyor belt structure: the lower conveyor belt 212 runs through the main frame 1 of the equipment, and the upper conveyor belt 211 is respectively installed at both ends of the equipment; the two cooperate to clamp and convey the pipe material 8. The distance between the upper conveyor belt 211 and the lower conveyor belt 212 can be adjusted by the traction machine opening height adjustment device 22 to accommodate pipe materials 8 of different diameters. Figure 3 Figure 4 As shown, the traction machine opening height adjustment device 22 includes a traction machine housing 221, a lifting motor 222, a conveyor belt clamping mechanism 223, and an adjusting guide rail 224. The traction machine housing 221 is located outside the traction machine 21, with both ends connected. The lifting motor 222 is fixed above the traction machine housing 221. The conveyor belt clamping mechanism 223 clamps and fixes itself above the upper conveyor belt 211. The adjusting guide rail 224 is fixed on both sides of the traction machine 21, and the upper conveyor belt 211 is slidably connected to the adjusting guide rail 224 on both sides. The output end of the lifting motor 222 is fixedly connected to the conveyor belt clamping mechanism 223. Under the control of the control system 7, the lifting motor 222 rotates, driving the conveyor belt clamping mechanism 223 to clamp the upper conveyor belt 211 and move it up and down, thereby clamping or releasing the pipe 8. Infrared sensors 225 are installed on both sides of the lower conveyor belt 212. When the system detects the entry of the pipe 8, the control system 7 controls the lifting motor 222 to move, which drives the upper conveyor belt 211 to automatically press down, automatically clamp the pipe 8, and start the conveying process. The opening height adjustment devices 22 of the front and rear traction machines work synchronously.

[0057] Cleaning system 3 is used to remove the original ink markings from the surface of the pipe, and includes a first cleaning device 31 and a second cleaning device 32 with identical structures. For example... Figure 3 As shown, each cleaning device includes a liquid storage device 311, a cleaning cloth 312, and a winding machine 313. (As illustrated...) Figure 5As shown, the liquid storage device 311 includes a liquid storage tank 3111, a sliding sealing head 3112, a first telescopic rod 3113, a second telescopic rod 3114, a third telescopic rod 3115, and a replaceable cleaning head 3116. The liquid storage tank 3111 stores cleaning agent and is sealed internally by the sliding sealing head 3112. The upper end of the sliding sealing head 3112 is connected to the first telescopic rod 3113, which is electrically connected to the control system 7. The control system 7 can control the sliding sealing head 3112 to move up and down, thereby controlling the cleaning agent to be drawn in and expelled from the bottom of the liquid storage tank 3111. The bottom of the liquid storage tank 3111 is sealed to the replaceable cleaning head 3116 via electromagnetic attraction, which is controlled by the control system 7. Both the lower end of the liquid storage tank 3111 and the replaceable cleaning head 3116 have corresponding small holes, which are connected to form a cleaning agent delivery channel. When the first telescopic rod 3113 is pulled up, the cleaning fluid can be drawn into the storage tank 3111 through the small hole at the bottom; when compressed downwards, the cleaning fluid can be squeezed from the storage tank 3111 through the small hole into the replaceable cleaning head 3116. The lower end of the replaceable cleaning head 3116 is a semi-circular groove, the size of which corresponds to the size of the pipe being cleaned. Selecting the appropriate replaceable cleaning head 3116 according to the size of the sample pipe being cleaned ensures a better fit to the pipe 8 and a cleaner result. The groove of the replaceable cleaning head 3116 has rounded corners on both sides to make the cleaning cloth 312 move more smoothly during operation. Rewinders 313 are installed on both sides of the storage tank 3111. The rewinders 313 are connected to the control system 7, which controls the winding and unwinding speed. The rewinders 313 support and wind up the cleaning cloth 312, ensuring that the cleaning cloth 312 covers the contact area between the replaceable cleaning head 3116 and the pipe 8. The winding machine 313 includes a spool on which a cleaning cloth 312 is wound. The cleaning cloth 312 comes out from the winding machine 313 on the left side of the liquid storage tank 3111, passes through the groove of the replaceable cleaning head 3116, and then connects to the winding machine 313 on the right side of the liquid storage tank 3111. The winding machine 313 is rotated by the control system 7, thereby controlling the movement of the cleaning cloth 312 and keeping the cleaning cloth 312 clean during the cleaning process.

[0058] The upper end of the liquid storage tank 3111 has a second telescopic rod 3114 and a third telescopic rod 3115. The entire cleaning device is connected to the top of the main frame 1 of the equipment through the second telescopic rod 3114 and the third telescopic rod 3115. By controlling these two telescopic rods, the cleaning system 3 can be moved up and down to ensure that it is in close contact with the surface of the pipe 8 being cleaned during the cleaning process.

[0059] The first cleaning device 31 contains a special ink cleaning agent in its storage tank 3111 to powerfully clean the ink printing. The second cleaning device 32 contains a residue-free cleaning agent in its storage tank 3111 to remove any remaining traces after cleaning by the first cleaning device 31, ensuring that the pipe surface is clean and dry after cleaning.

[0060] A visual inspection system 4 is installed behind the first cleaning device 31 to monitor the cleaning effect on the pipe surface online. The visual inspection system 4 is threadedly fixed to the main frame 1 of the equipment and its height can be adjusted via the threads. The visual inspection system 4 is a video acquisition device such as a camera, used to monitor the cleanliness of the ink-jet printing on the surface of the pipe to be cleaned. The visual inspection system 4 is electrically connected to the control system 7, and the real-time monitoring image is displayed on the control system 7. When incomplete cleaning is detected, an alarm is issued and the equipment stops operating. The operator needs to adjust the cleaning parameters or replace the cleaning accessories, and then control the traction machine 21 to reverse, turning back the uncleaned pipe 8 for re-cleaning until the pipe is clean.

[0061] The surface treatment system 5 is located behind the vision inspection system 4 and is used to improve the adhesion of the pipe surface. The surface treatment system 5 is preferably a plasma generator, which is used to perform plasma treatment on the pipe surface to increase the surface roughness of the pipe and improve the adhesion of subsequent inkjet printing.

[0062] The coding system 6 is located behind the surface treatment system 5 and is used to re-code the treated pipe surface. The coding system 6 includes a coding machine 61, a coding machine control panel 62, and a coding machine height adjustment device 63. The coding machine 61 is fixedly mounted on the main frame 1 of the equipment via the coding machine height adjustment device 63. The coding machine control panel 62 is fixedly mounted on the side of the main frame 1 of the equipment. Parameters such as the coding content and time are input through the coding machine control panel 62. The coding machine 61 starts coding when it detects the pipe passing by. The coding machine height adjustment device 63 allows manual adjustment of the height of the coding machine 61 to accommodate pipes of different sizes. Figure 6 As shown, the inkjet printer height adjustment device 63 includes a fixed base 631, a vertical slide rail 632, a lead screw 633, a slider 634, and a manual turntable 635. The vertical slide rail 632 is vertically fixed to the main frame 1 of the equipment via the fixed base 631, and the lead screw 633 is fixed parallel to the vertical slide rail 632 via the fixed base 631. The slider 634 is threadedly connected to the lead screw 633 and slidably connected to the vertical slide rail 632. The manual turntable 635 is fixed to the upper end of the lead screw 633 and is fixedly connected to the lead screw 633. The inkjet printer 61 is fixedly mounted on the slider 634. By rotating the manual turntable 635, the lead screw 633 can be rotated, thereby causing the slider 634 to move up and down along the lead screw 633 and the vertical slide rail 632, thus adjusting the height of the inkjet printer 61.

[0063] The control system 7 includes a main control panel 71, which centrally controls the operation of each subsystem, specifically including:

[0064] Controlling the conveying speed and direction of the traction system 2; specifically including receiving signals from the infrared sensor 225 and controlling the lifting and lowering of the upper conveyor belt 211, the forward and reverse rotation and speed of the traction machine 21;

[0065] The cleaning system 3 controls the up-and-down movement, the amount of cleaning agent supplied, and the speed of the cleaning cloth winding. Specifically, it controls the up-and-down movement of the first cleaning device 31 and the second cleaning device 32 to ensure that the replaceable cleaning head 3116 is in contact with the surface of the pipe 8 to be cleaned; it controls the moving speed of the first telescopic rod 3113 in the liquid storage tank 3111 to control the liquid output; it controls the electromagnetic attraction switch at the lower end of the liquid storage tank 3111 to facilitate the replacement of the replaceable cleaning head 3116; and it controls the speed of the winding machine 313 to adjust the replacement speed of the cleaning cloth 312 to ensure thorough cleaning.

[0066] Receive and process image signals from vision inspection system 4;

[0067] Control the start and stop of the surface treatment system 5;

[0068] Coordinate the overall machine operation process to achieve automated operation.

[0069] The visual inspection system 4 and the control system 7 form a closed-loop control circuit: when the visual inspection system detects that the cleaning is not up to standard, the control system immediately issues an alarm and instructs the traction system 2 and the cleaning system 3 to stop operating and wait for manual intervention.

[0070] The present invention provides a control method for an automatic cleaning and re-marking device for inkjet printing on pipes, comprising the following steps:

[0071] Step 1: System Initialization and Preparation

[0072] Step 1.1: Mechanical adjustment: According to the diameter of the pipe 8 to be cleaned, adjust the clamping distance of the traction machine 21 through the traction machine opening height adjustment device 22 to ensure stable pipe transportation.

[0073] Step 1.2: Cleaning agent preparation: Control the first telescopic rod 3113 to move upward via the main control panel 71 of the equipment, and draw the cleaning agent from the sealed container into the storage tank 3111.

[0074] Step 1.3: Component installation: Select a replaceable cleaning head 3116 that matches the pipe size and install it at the bottom of the liquid storage tank 3111 via electromagnetic attraction; install the cleaning cloth 312 on the winding machine 313 and guide it through the groove of the cleaning head.

[0075] Step 2: Parameter Settings

[0076] Step 2.1: Input of coding information: Input the content to be re-coded and related parameters on the control panel 62 of the coding machine.

[0077] Step 2.2: Setting operating parameters: Set the traction speed, cleaning cloth winding speed, cleaning agent supply speed, and start / stop logic of each system on the main control panel 71 of the equipment.

[0078] Step 3: Start the cleaning process

[0079] Step 3.1: Pipe feeding and conveying: The pipe 8 to be cleaned is placed into the inlet of the traction machine 21. After the infrared sensor 225 detects the pipe 8, the control system 7 automatically controls the lifting motor 222 to press the pipe and starts the traction machine 21 to convey the pipe into the cleaning area.

[0080] Step 3.2: Cleaning head positioning and fitting: When the pipe 8 runs to the bottom of the first cleaning device 31, the control system 7 controls the second telescopic rod 3114 and the third telescopic rod 3115 to move down, so that the replaceable cleaning head 3116 fits tightly against the surface of the pipe.

[0081] Step 4: Apply cleaning agent and wipe clean

[0082] Step 4.1: Cleaning agent output: The main control panel 71 controls the first telescopic rod 3113 to move down, squeezing a metered amount of cleaning agent through the through hole into the replaceable cleaning head 3116, which wets the cleaning cloth 312.

[0083] Step 4.2: Continuous wiping: The synchronous control rewinder 313 rewinds and unwinds the cleaning cloth 312 at a set speed, so that the surface of the pipe is always in contact with the clean cloth surface, thus realizing automatic continuous cleaning.

[0084] Step 5: Cleaning effect monitoring and feedback control

[0085] Step 5.1: Image acquisition and judgment: After the pipe is cleaned by the first cleaning device 31, it enters the field of view of the vision inspection system 4. The system acquires surface images in real time and transmits them to the control system 7.

[0086] Step 5.2: Compliance Processing: If the cleaning effect meets the set standards, pipe 8 continues to be transported to the next process.

[0087] Step 5.3: Non-compliance handling: If ink residue is detected, the control system 7 immediately executes the following error correction procedure: issues an audible and visual alarm and stops the traction system 2 and the cleaning system 3;

[0088] Step 5.3.1: The operator adjusts the cleaning parameters on the main control panel 71 of the equipment as needed;

[0089] Step 5.3.2: Control the traction machine 21 to reverse through the control system 7, and retract the pipe 8 back to the cleaning start position;

[0090] Step 5.3.3: Restart the cleaning process until the visual inspection system confirms that the cleaning meets the standards.

[0091] Step 6: Post-processing and re-coding

[0092] Step 6.1: Fine washing and drying: The pipes that pass through visual inspection enter the second cleaning device 32, where they are finely washed and dried using a residue-free cleaning agent. The process is the same as that of the first cleaning device.

[0093] Step 6.2: Surface activation treatment: The pipe is subjected to plasma treatment by surface treatment system 5 to improve surface adhesion.

[0094] Step 6.3: Re-printing: The processed pipe is conveyed to the bottom of the inkjet printer 61. After the inkjet printer recognizes the position, it completes the re-printing according to the preset content.

[0095] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An automatic cleaning and re-inking device for ink-jet printing on pipes, characterized in that, include: Equipment main frame (1); The traction system (2) is set at the inlet and outlet ends of the main frame (1) of the equipment and is used to clamp and transport the pipe (8) to be cleaned. The cleaning system (3) is set inside the main frame (1) of the equipment and located between the traction systems (2) for removing ink markings from the surface of the pipe (8); The cleaning system (3) includes a first cleaning device (31) and a second cleaning device (32) arranged sequentially along the pipe conveying direction. The first cleaning device (31) is used for main cleaning with ink cleaning agent, and the second cleaning device (32) is used for fine cleaning and drying with residue-free cleaning agent. Both the No. 1 cleaning device (31) and the No. 2 cleaning device (32) include: A liquid storage device (311) is used to store and supply cleaning agent; A replaceable cleaning head (3116) is detachably connected to the bottom of the liquid storage device (311), and its lower end is provided with a groove that matches the outer wall of the pipe (8); A cleaning cloth (312), placed within the groove of the replaceable cleaning head (3116), is used to contact and wipe the surface of the pipe (8); and A winding machine (313) is installed on both sides of the liquid storage device (311) for winding up and unwinding the cleaning cloth (312). A visual inspection system (4) is installed between the cleaning systems (3) for online inspection of the cleaning effect on the surface of the pipe (8); A coding system (6), located behind the vision inspection system (4), is used to print codes on the surface of the cleaned pipe (8); and The control system (7) is electrically connected to the traction system (2), cleaning system (3), vision inspection system (4) and coding system (6) to control the coordinated operation of each system.

2. The automatic cleaning and re-inking device for pipe inkjet printing according to claim 1, characterized in that, The liquid storage device (311) includes a liquid storage tank (3111), a slidable sealing head (3112) disposed inside the liquid storage tank (3111), and a first telescopic rod (3113) that drives the sealing head to move. The cleaning agent is squeezed from the liquid storage tank (3111) to the replaceable cleaning head (3116) by the movement of the first telescopic rod (3113).

3. The automatic cleaning and re-inking device for pipe inkjet printing according to claim 1, characterized in that, The traction system (2) includes a traction machine (21) and a traction machine opening height adjustment device (22). The traction machine (21) includes an upper conveyor belt (211) and a lower conveyor belt (212). The traction machine opening height adjustment device (22) is used to adjust the distance between the upper conveyor belt (211) and the lower conveyor belt (212) to accommodate pipes (8) of different diameters.

4. The automatic cleaning and re-inking device for pipe inkjet printing according to claim 3, characterized in that, The traction machine opening height adjustment device (22) includes a lifting motor (222) and a conveyor belt clamping mechanism (223). The lifting motor (222) drives the conveyor belt clamping mechanism (223) under the control of the control system (7) to drive the upper conveyor belt (211) to rise and fall.

5. The automatic cleaning and re-inking device for pipe inkjet printing according to claim 1, characterized in that, It also includes a surface treatment system (5) disposed between the visual inspection system (4) and the inkjet printing system (6), the surface treatment system (5) being a plasma generator used to activate the surface of the pipe (8) to improve the adhesion of the inkjet printing.

6. The automatic cleaning and re-inking device for pipe inkjet printing according to claim 1, characterized in that, The visual inspection system (4) and the control system (7) form a closed-loop control circuit. When the visual inspection system (4) detects that the cleaning is not up to standard, the control system (7) controls the traction system (2) to reverse and return the pipe (8) to the cleaning start position for cleaning again.

7. A method for automatic cleaning and re-inking of ink-printed coatings on pipes based on the apparatus described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Adjust the clamping distance of the traction system according to the diameter of the pipe to be cleaned, install the matching cleaning head and cleaning cloth, and supply cleaning agent to the cleaning system; S2: Place the pipe to be cleaned into the traction system, and the system will automatically clamp and transport the pipe into the cleaning station; S3: The cleaning head of the cleaning system comes into contact with the surface of the pipe and supplies cleaning agent, while continuously wiping and cleaning the surface of the pipe by rewinding the cleaning cloth. S4: The cleaning effect is judged online by the visual inspection system. If the cleaning meets the standard, the pipe will enter the subsequent process; if the cleaning does not meet the standard, the system will alarm and control the traction system to return the pipe for cleaning again. S5: Perform surface treatment on pipes that have passed the cleaning standards; S6: Re-print the code onto the treated pipe surface according to the preset content.

8. The method according to claim 7, characterized in that, The cleaning process in step S3 includes a main cleaning and a fine cleaning and drying step performed sequentially, using an ink cleaner and a residue-free cleaning agent, respectively.

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