Color-coated sheet paint film thickness real-time detection device and detection method

Abstract

The invention discloses a color-coated sheet paint film thickness real-time detection device and detection method, and relates to the technical field of color-coated sheet paint film thickness detection. According to the real-time detection device and method for the paint film thickness of the color-coated sheet, a second carrier roller is arranged below a laser detection head, first carrier rollers are arranged on the two sides of the second carrier roller, a gravity roller is arranged between the first carrier rollers and the second carrier roller, and a swing arm supporting assembly is arranged on the moving track of the gravity roller. In the self-tensioning and rolling process of the color-coated sheet, through the arrangement of the swing arm supporting assembly, when the color-coated sheet with abnormal protrusions passes through the to-be-detected roller body, the gravity roller on one side moves away from the second carrier roller in a receding mode, the tensioning force is reduced, the clamping and rolling state is relieved, and the gravity roller on the other side moves around the second carrier roller in a tensioning mode; and the clamping roller feeding is continuously applied, so that the color-coated sheet with abnormal bulges is in smooth transition, and a smooth conveying state is always kept to carry out a paint film thickness detection procedure.

Description

Technical Field

[0001] This invention relates to the field of paint film thickness detection technology for pre-coated steel sheets, specifically to a real-time paint film thickness detection device and method for pre-coated steel sheets. Background Technology

[0002] Color-coated steel sheet is a composite material made by coating an organic coating on the surface of a steel plate and then baking and curing it. It combines the strength of steel with the decorative properties and corrosion resistance of the coating and is widely used in the construction industry, electrical appliance manufacturing and other fields. In the production process of color-coated steel sheet, in order to ensure the quality of its paint film spraying, the paint film thickness needs to be tested after the paint film is sprayed and cured. Paint film thickness testing methods are generally divided into destructive testing (cutting and sampling testing) and non-destructive testing (laser measurement). Among them, laser testing has become the mainstream testing method in the color-coated steel sheet production process due to its non-destructive and real-time detection characteristics.

[0003] For example, Chinese patent CN120778014A discloses a laser-based device and method for detecting the coating thickness of color-coated steel sheets. This type of detection method uses a conveying mechanism to simultaneously unwind and rewind the color-coated steel sheet rolls. During the unwinding and rewinding process, a removal mechanism removes burrs from the coating surface of the color-coated steel sheet, preventing burrs from causing bulges and thus avoiding deviations in laser measurement during the color-coated steel sheet testing process.

[0004] However, during the roll conveying production of color-coated steel sheets, the surface of the sheets often cannot maintain a flat state in real time (1. Burrs generated by spraying, especially when there are dense burrs, are often not effectively cleaned by existing removal mechanisms, resulting in burr residue; 2. Color-coated steel sheet raw materials are usually welded end to end to achieve continuous production processes, and the inherent protrusion defects generated by the welding process). When color-coated steel sheets with "abnormal protrusions" pass through the conveyor rollers, the "abnormal protrusions" cause a sudden change in the contact pressure between the sheet and the roller surface, causing the color-coated steel sheet to experience conveying obstruction (change in conveying tension). After forcibly passing through the conveyor rollers, the sudden release of the obstruction causes the color-coated steel sheet to bounce, resulting in fluctuations in the color-coated steel sheet passing through the laser detection instrument, causing a large deviation in the detection data. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device and method for real-time detection of paint film thickness on color-coated steel sheets, solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device and method for real-time detection of paint film thickness on color-coated steel sheets.

[0007] On one hand, embodiments of the present invention provide a real-time detection device for the paint film thickness of color-coated steel sheets, including housings arranged on both sides of the conveying path of the color-coated steel sheets, wherein laser detection heads are arranged side by side between the two housings, and further including: a second idler roller arranged below the laser detection head, with first idler rollers arranged on both sides of the second idler roller for traction conveying of the color-coated steel sheets; two sets of gravity rollers, respectively located between the first idler rollers and the second idler rollers, for tension conveying of the color-coated steel sheets, the two sets of gravity rollers responding to the winding tension of the color-coated steel sheets to swing upwards in opposite directions, applying gravity tension to the color-coated steel sheets, and clamping the color-coated steel sheets between the gravity rollers and the second idler rollers for roller conveying, and during the tension roller conveying of the color-coated steel sheets, the two sets of gravity rollers also responding to abnormal protrusions of the color-coated steel sheets to swing unidirectionally, eliminating conveying obstruction and bouncing caused by abnormal protrusions; and a swing arm support assembly, the swing arm support assembly being arranged on the moving trajectory of the gravity rollers for driving the opposing swing action and unidirectional swing action of the two sets of gravity rollers.

[0008] Furthermore, the swing arm support assembly includes: a first slide groove located on the movement trajectory of the gravity roller, wherein a second slide groove is provided on one side of the first slide groove; both ends of the gravity roller are provided with track slides, which can slide along the first slide groove to the second slide groove, so that when the two sets of gravity rollers swing in opposite directions, the two sets of track slides slide along the first slide groove, and when the two sets of gravity rollers swing in one direction, one set of track slides slides along the second slide groove, and the other set of track slides slides in the opposite direction along the first slide groove.

[0009] Furthermore, the swing arm support assembly also includes: a central shaft located on the central shaft path of the second idler roller, and two sets of bushings sleeved on the central shaft, wherein a support arm is provided on one side of the bushing, and a telescopic arm is provided at the telescopic end of the support arm. The telescopic arm is connected to the track slide table to provide support extension for the unidirectional swing movement of the gravity roller; the two sets of bushings are provided with two sets of limiting slide grooves in an interlaced manner along their circumference, and a sliding buckle is provided on one side of the rotation path of the limiting slide groove. The sliding buckle can slide along the opposite limiting slide groove to provide limitation for the opposing swing movement of the two sets of gravity rollers.

[0010] Furthermore, the first chute has an arc-shaped structure, and the center of the first chute is coaxial with the axis of the second idler roller, so that when the gravity roller slides along the first chute, the gravity roller moves around the second idler roller and always clamps the color-coated plate; the second chute has a linear structure, and the second chute is tangent to the second idler roller, so that when the gravity roller slides along the second chute, the gravity roller moves away from the second idler roller and releases the clamping of the color-coated plate.

[0011] Furthermore, it also includes a real-time drive assembly for driving the gravity roller and the second idler roller to operate synchronously. The real-time drive assembly is used to drive the gravity roller to maintain a clamping and feeding state of the color-coated plate with the second idler roller during the movement process. The real-time drive assembly includes: a second output shaft located at both ends of the central shaft of the second idler roller, with a third gear provided at one end of one set of the second output shafts; a second input shaft located on one side of the third gear, with a second gear provided at one end of the second input shaft, the second gear meshing with the third gear; and a first input shaft located on one side of the second input shaft, with a first transmission belt between the first input shaft and the second input shaft.

[0012] Furthermore, the real-time drive component also includes: a first output shaft located at both ends of the central shaft of the gravity roller, wherein a second transmission belt is provided between the first output shaft and the first input shaft; and tension pulleys arranged on the transmission path of the second transmission belt, and at least one set is provided for tension adjustment during the transmission process of the second transmission belt.

[0013] Furthermore, the real-time drive assembly also includes: a track frame, disposed on one side of the tension pulley, wherein a lead screw is rotatably mounted inside the track frame, and a support slide is provided along the axial direction of the lead screw, the support slide supporting the tension pulley; a driven bevel gear, disposed at one end of the lead screw, and a driving bevel gear meshing on one side thereof, wherein a first gear is also provided on one side of the central shaft of the driving bevel gear; A rack is provided on the swing path of the support arm, and the rack meshes with the first gear.

[0014] Furthermore, the rack has an arc-shaped gear ring structure, and the center of the rack is coaxial with the center of the central axis.

[0015] Furthermore, the laser detection head is arranged side by side above the transmission path of the color-coated plate via a crossbeam, and the measurement direction of the laser detection head is directly above the roller body of the second idler roller.

[0016] On the other hand, embodiments of the present invention also provide a method for real-time detection of paint film thickness on color-coated steel sheets, comprising the following steps: Step 1: The color-coated sheet after spraying and curing is pulled and conveyed from above the first and second idlers and below the two sets of gravity rollers, forming a double U-shaped conveying state of the color-coated sheet; Step 2: During the winding process of the color-coated sheet, the swing arm support assembly enables the winding tension to overcome the gravity of the gravity rollers, driving the two sets of gravity rollers to swing upwards in opposite directions around the second idler roller. On the one hand, the color-coated sheet is clamped between the gravity rollers and the second idler roller for roller feeding. On the other hand, the weight of the two sets of gravity rollers provides tension force for the color-coated sheet, keeping it in a self-tensioned conveying state, covering the roller surface of the second idler roller for clamping and roller feeding. During the roller feeding process, the thickness of the paint film is detected by a laser detection head. Step 3: During the roll feeding of the color-coated sheet, when an abnormal protrusion appears on the sheet surface and passes the gravity roller, the swing arm support assembly causes the gravity roller in contact with the abnormal protrusion to swing and move aside, releasing the clamping state with the second idler roller, eliminating clamping and conveying resistance, and relaxing the tension of the U-shaped color-coated sheet with the abnormal protrusion. Meanwhile, the gravity roller on the other side, driven by the swing arm support assembly, swings and moves in the same direction, continuously applying clamping and rolling conditions to the color-coated sheet with the second idler roller, and increasing the tension of the U-shaped color-coated sheet on the other side, compensating for the relaxation of the U-shaped color-coated sheet with the abnormal protrusion, so that the color-coated sheet always maintains a suitable tension and smoothly transitions to the abnormal protrusion.

[0017] The present invention has the following beneficial effects: (1) The real-time detection device and method for paint film thickness of the color-coated steel sheet, through the setting of the swing arm support component, enables the color-coated steel sheet to form a gravity tension state on the one hand during the winding process of passing through the first idler roller, the second idler roller and the gravity roller, providing tension adjustment during the conveying process of the color-coated steel sheet, and on the other hand, to form a clamping roller feeding state, providing stable roller feeding during the winding process of the color-coated steel sheet. Then, under the drive of the real-time drive component, the color-coated steel sheet is driven to perform the paint film thickness detection process in the self-tensioning and roller feeding state, and its paint film thickness detection is more stable.

[0018] (2) The real-time detection device and method for paint film thickness of the color-coated steel sheet, through the setting of the swing arm support component, can also provide self-tensioning adjustment during the conveying process. When the color-coated steel sheet with "abnormal protrusion" passes through the roller body to be detected, the gravity roller on one side moves away from the second support roller to make room, reduce the tension and release the clamping roller conveying state, while the gravity roller on the other side moves around the second support roller to make room, compensate for the relaxation caused by the rooming, and continuously apply clamping roller conveying, so that the color-coated steel sheet with "abnormal protrusion" can smoothly transition, and avoid the color-coated steel sheet with "abnormal protrusion" from the sudden change of contact pressure with the roller surface, which causes the conveying to stall, lose speed and bounce. This ensures that the color-coated steel sheet is always in a stable conveying state for the paint film thickness detection process, and improves the detection accuracy.

[0019] (3) The real-time detection device and method for the paint film thickness of the color-coated plate, by giving way to the color-coated plate with "abnormal protrusion", not only can the color-coated plate always maintain stable conveying characteristics for roller conveying detection, but also has self-protection characteristics to avoid secondary damage to the paint film caused by the pressure of the "abnormal protrusion" and the scratching of the roller body.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first structure of the present invention; Figure 2 This is a schematic diagram of the second structure of the present invention; Figure 3 This is a schematic diagram of the assembly of the swing arm support component in this invention; Figure 4 This is a schematic diagram of the driving mechanism of the gravity roller and the second idler roller in this invention; Figure 5 This is a schematic diagram of the moving track of the gravity roller in this invention; Figure 6 This is a first assembly diagram of the real-time drive component in this invention; Figure 7 This is a second assembly diagram of the real-time drive component in this invention; Figure 8 This is a schematic diagram of the structure of the real-time driving component in this invention; Figure 9 This is a schematic diagram of the tensioning drive of the tensioning pulley in this invention; Figure 10 This is a schematic diagram of the swing arm support assembly in this invention; Figure 11 This is an exploded view of the swing arm support assembly in this invention; Figure 12 (a), (b), and (c) in the figure are, in order, diagrams showing the changes in the force state of the swing arm support assembly in this invention; Figure 13 This is a schematic diagram showing the state of the clamping rollers feeding the color-coated sheet of the present invention. Figure 14 This is a schematic diagram of the first roller feeding state of the color-coated sheet with abnormal protrusions according to the present invention. Figure 15 This is a schematic diagram of the second roller feeding state of the color-coated sheet with abnormal protrusions according to the present invention.

[0022] In the diagram, 1. Housing; 2. Drive motor; 3. Swing arm structure; 310. Central shaft; 320. Bushing; 330. Support arm; 340. Telescopic arm; 350. Limiting groove; 360. Sliding buckle; 4. Track groove; 410. First groove; 420. Second groove; 5. Track slide; 6. First roller; 7. Gravity roller; 8. Second roller; 9. Crossbeam; 10. Laser detection head; 11. First input shaft; 12. Rack; 13. First gear; 14. First... 15. Output shaft; 16. Second output shaft; 17. First driving pulley; 18. First driven pulley; 19. Second input shaft; 20. Second gear; 21. Third gear; 22. Second driving pulley; 23. Second driven pulley; 24. Second transmission belt; 25. Tensioning pulley; 26. Tensioning adjustment structure; 2610. Track frame; 2620. Lead screw; 2630. Support slide; 2640. Driven bevel gear; 2650. Driving bevel gear. Detailed Implementation

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

[0024] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] The following is based on Figures 1-15 This invention describes a device and method for real-time detection of paint film thickness on color-coated steel sheets, provided by an embodiment of the present invention.

[0026] like Figures 1-2 , Figures 13-15 As shown, in one aspect, an embodiment of the present invention provides a real-time detection device for the paint film thickness of color-coated steel sheets, including housings 1 arranged on both sides of the conveying path of the color-coated steel sheets. Laser detection heads 10 are arranged side-by-side between the two housings 1, and the laser detection heads 10 are arranged above the conveying path of the color-coated steel sheets via a crossbeam 9. A second idler roller 8 is arranged below the laser detection head 10, with the measurement direction of the laser detection head 10 directly facing the upper part of the roller body of the second idler roller 8. Simultaneously, first idler rollers 6 are arranged on both sides of the second idler roller 8, rotatably mounted on both sides of the housing 1. The arrangement of the first idler rollers 6 and the second idler rollers 8 is used for the traction and conveying of the color-coated steel sheets. Furthermore, two sets of gravity rollers are arranged between the first idler rollers 6 and the second idler rollers 8. 7. A swing arm support assembly is provided on the moving trajectory of the gravity roller 7 for self-tensioning adjustment during the conveying process of the color-coated sheet. During the roller conveying process of the color-coated sheet, it is pulled out from above the first idler roller 6 and the second idler roller 8 and below the two sets of gravity rollers 7, forming a double U-shaped roller conveying state. When the color-coated sheet is rolled up, its winding tension overcomes the gravity of the gravity roller 7, causing it to swing upwards in the opposite direction. On the one hand, the gravity of the gravity roller 7 is used to form the tension force of the color-coated sheet. On the other hand, the clamping state of the gravity roller 7 and the second idler roller 8 is used to clamp and roll the color-coated sheet, so that the color-coated sheet is kept taut and in a quantitative roller conveying state, covering the second idler roller 8 and smoothly transitioning. The paint film thickness is detected by the laser detection head 10 (e.g., Figure 13 (As shown).

[0027] In this implementation scheme, during the clamping and conveying process of the color-coated steel sheet, when the sheet surface with "abnormal protrusions" passes the gravity roller 7, one side of the gravity roller 7, obstructed by the "abnormal protrusions," sways upward to make way, separating from the second support roller 8. This avoids hard compression while reducing the continuous resistance and tension of the color-coated steel sheet with "abnormal protrusions," thus relaxing its tension and allowing the color-coated steel sheet with "abnormal protrusions" to transition smoothly. At this time, the other side of the gravity roller 7 moves synchronously around the second support roller 8, continuously applying the clamping and conveying state while increasing the tension of the color-coated steel sheet to compensate for the relaxation on one side. This ensures that the color-coated steel sheet always maintains a suitable tension state for the conveying and inspection process (such as...). Figure 14 As shown), similarly, when the color-coated sheet with the "abnormal protrusion" passes the gravity roller 7 on the other side, it again undergoes a unidirectional swaying movement to make way, allowing the color-coated sheet with the "abnormal protrusion" to transition smoothly (as shown). Figure 15 As shown), after the transition of the color-coated sheet with the "abnormal protrusion" is completed, under the conveying and winding force of the color-coated sheet, the two sets of gravity rollers 7 are balanced and reset, preparing for the next unidirectional sway movement to make way.

[0028] like Figures 3-5 , Figures 10-12 As shown, to achieve the swaying movement of the gravity roller 7, the swing arm support assembly includes a first groove 410 located on the movement trajectory of the gravity roller 7, and a second groove 420 is also provided on one side of the first groove 410. The first groove 410 and the second groove 420 constitute a track groove 4, which is formed on the housing 1. At the same time, a track slide 5 is provided in the track groove 4 for sliding support of the gravity roller 7. The track slide 5 can slide along the first groove 410 to the second groove 420. When the two sets of gravity rollers 7 sway in opposite directions under the tension of the coated plate winding, the two sets of track slides 5 slide along the first groove 410 to provide gravity. The roller 7 provides the track required for the unidirectional swaying movement. During subsequent roller feeding, when a color-coated sheet with an "abnormal protrusion" passes through one set of gravity rollers 7, it pushes the corresponding gravity roller 7 to sway unidirectionally to make way. At this time, the corresponding track slide 5 slides along the second slide groove 420, while the other set of gravity rollers 7, under the action of the unidirectional swaying force, sway synchronously, pushing the corresponding track slide 5 to slide in the opposite direction along the first slide groove 410, providing the track required for the unidirectional swaying movement of the gravity roller 7. During this process, one side of the gravity roller 7 relaxes to allow the color-coated sheet to transition smoothly, while the other side of the gravity roller 7 remains taut to compensate for the relaxation of the color-coated sheet. Specifically: The first chute 410 has an arc-shaped structure, and its center is coaxial with the axis of the second idler roller 8. By making the first chute 410 an arc-shaped structure coaxial with the axis of the second idler roller 8, the gravity roller 7 can move in opposite directions around the second idler roller 8 when subjected to the winding tension of the color-coated sheet, thus always clamping and feeding the color-coated sheet. Meanwhile, the second chute 420 has a linear structure and is tangent to the second idler roller 8. By making the second chute 420 a linear structure tangent to the second idler roller 8, the gravity roller 7 can withstand "abnormal convexity"... When the color-coated sheet is lifted, it can slide along the second slide groove 420 to release the clamping roller feeding state, avoid excessive roller pressure tension, which would cause excessive roller feeding tension fluctuation, secondary damage to the color-coated sheet and damage to the roller body, and make the color-coated sheet with "abnormal protrusion" transition smoothly. On the other hand, while the gravity roller 7 on one side is moving to release, its movement can drive the gravity roller 7 on the other side to rotate around the second support roller 8, apply tension compensation to the loose color-coated sheet, and keep the gravity roller 7 and the second support roller 8 in a clamping roller feeding state in real time.

[0029] It should be noted that when the two sets of gravity rollers 7 are lifted in opposite directions by the tension of the coated plate winding, the gravity rollers 7 slide along the first slide groove 410. During this process, the gravity rollers 7 slide to the intersection of the first slide groove 410 and the second slide groove 420 and are limited, so that when the gravity rollers 7 come into contact with the color coated plate with the "abnormal protrusion", one side of the gravity rollers 7 can quickly slide into the second slide groove 420 to produce a slack, and the other side of the gravity rollers 7 can quickly slide into the first slide groove 410 to produce tension compensation.

[0030] As a further embodiment, the swing arm support assembly also includes a swing arm structure 3. The swing arm structure 3 includes a central shaft 310 located on the central axis path of the second idler roller 8. The central shaft 310 is mounted on the housing 1, and two sets of bushings 320 are sleeved on the central shaft 310. A support arm 330 is provided on one side of each bushing 320, and a telescopic arm 340 is provided at the telescopic end of the support arm 330. The telescopic arm 340 is connected to the track slide 5, providing support extension for the unidirectional swaying movement of the gravity roller 7. When one set of gravity rollers 7 contacts the color-coated plate with "abnormal protrusions," an abnormal sway occurs. When the gravity roller 7 moves to make way for the second chute 420, by utilizing the telescopic combination of the support arm 330 and the telescopic arm 340, it provides continuous arm force support during the movement of the gravity roller 7. On the other hand, its swaying force can be transmitted to the combination of the support arm 330 and the telescopic arm 340 on the other side (when the gravity roller 7 is inside the first chute 410, the telescopic arm 340 is at the bottom of the support arm 330, and the two are in close contact, so that when the gravity roller 7 slides along the first chute 410, no telescopic transmission is generated), driving the gravity roller 7 on the other side to rotate around the second support roller 8.

[0031] Furthermore, such as Figure 12 As shown in the state change diagrams (a), (b), and (c), the two sets of bushings 320 are staggered around their circumference and have two sets of limiting grooves 350 (the limiting grooves 350 are arc-shaped and coaxial with the bushings 320). A sliding buckle 360 ​​is provided on one side of the rotation path of the limiting groove 350. The sliding buckle 360 ​​can slide along the opposite limiting groove 350, providing a limit for the opposing swaying movement of the two sets of gravity rollers 7. During the opposing swaying movement of the two sets of gravity rollers 7 driven by the winding tension of the color-coated sheet, since the gravity rollers 7 rotate around the central axis of the second idler roller 8, and the central axis 310 is directly opposite the central axis of the second idler roller 8, the gravity rollers 7 sway around the second idler roller 8. While the roller 8 rotates, it drives the bushing 320 to rotate coaxially. As the two sets of bushings 320 rotate in opposite directions with the two sets of gravity rollers 7, the limiting groove 350 and the sliding buckle 360 ​​cooperate to limit the rotation of the gravity roller 7. This causes the gravity roller 7 to be subjected to the winding tension and swing to the intersection of the first groove 410 and the second groove 420 for limitation. On the one hand, it clamps the color-coated plate on the second roller 8, and on the other hand, it forms a self-gravity tension state. Furthermore, since the gravity roller 7 is now limited, when the gravity roller 7 comes into contact with the color-coated plate with the "abnormal protrusion" in the future, it can form a unidirectional swing movement state to adjust the self-tension of the color-coated plate with the "abnormal protrusion".

[0032] like Figure 1 , Figure 3 , Figures 6-9As shown, it also includes a real-time drive assembly for synchronously driving the gravity roller 7 and the second idler roller 8. The real-time drive assembly is located inside the housing 1 and is used to ensure that the gravity roller 7 and the second idler roller 8 maintain a clamping and feeding state on the color-coated plate during the movement process. The real-time drive assembly includes second output shafts 15 located at both ends of the central axis of the second idler roller 8. The second idler roller 8 is rotatably mounted on the housing 1 via the second output shafts 15. A third gear 21 is provided at one end of one set of second output shafts 15. At the same time, a second input shaft 19 is rotatably mounted on the housing 1 on one side of the third gear 21. A second gear 20 meshes with the third gear 21 at one end of the second input shaft 19 (the second gear 20 and the third gear 21 are differential gears to maintain a suitable transmission ratio between the gravity roller 7 and the second idler roller 8 and to form forward and reverse rotation). The gear structure ensures that the gravity roller 7 and the second idler roller 8 maintain a relative rolling operation. Furthermore, a first input shaft 11 is rotatably mounted on the housing 1 on one side of the second input shaft 19. A first transmission belt 17 connects the first input shaft 11 and the second input shaft 19 (one end of the first input shaft 11 is provided with a first driving pulley 16, and the other end of the second input shaft 19 is provided with a first driven pulley 18, which are connected by the first transmission belt 17). A drive motor 2 is provided on the other side of the first input shaft 11. The drive motor 2 serves as the driving source to drive the first input shaft 11 to rotate. Then, under the transmission of the first transmission belt 17, the second input shaft 19 is driven to rotate. Finally, under the transmission of the second gear 20 and the third gear 21, the second idler roller 8 is driven to rotate actively.

[0033] The real-time drive assembly also includes a first output shaft 14 located at both ends of the central shaft of the gravity roller 7. The first output shaft 14 is rotatably mounted on the track slide 5 (the track slide 5 provides yaw movement of the gravity roller 7 through the track groove 4, and provides limiting support through the combination of the support arm 330 and the telescopic arm 340. By using the tension of the color-coated plate to limit and lift the gravity roller 7, the gravity roller 7 maintains the rolling state of the color-coated plate). A second transmission belt 24 is provided between the first output shaft 14 and the first input shaft 11 (one end of the first output shaft 14 is provided with a second driven pulley 23, and one end of the first input shaft 11 is provided with a second driving pulley 22, the second driving pulley 22 and the second driven pulley 24 are connected). (The first input shaft 11 and the second output shaft 14 are connected by a second transmission belt 24. Two sets of tension pulleys 25 are also provided on the transmission path of the second transmission belt 24 for tension adjustment during transmission. While the first input shaft 11 rotates, the gravity roller 7 on the first output shaft 14 is driven to rotate via the intermediate transmission of the second transmission belt 24, forming a relative roller feeding state with the second idler roller 8, for roller feeding and inspection of the color-coated sheet. Furthermore, since the gravity roller 7 will sway during operation, the tension pulleys 25 are used to rotate synchronously with the gravity roller 7 to compensate for the slack or tension caused by the swaying movement of the gravity roller 7 during the operation of the second transmission belt 24. Specifically:) The real-time drive assembly also includes a tension adjustment structure 26 disposed on one side of the tension pulley 25. The tension adjustment structure 26 includes a track frame 2610 fixed on the housing 1. A lead screw 2620 is rotatably mounted inside the track frame 2610, and a support slide 2630 is provided along the axial direction of the lead screw 2620. The support slide 2630 supports the tension pulley 25. Meanwhile, a driven bevel gear 2640 is provided at one end of the lead screw 2620, and a driving bevel gear 2650 meshes with it on one side. A first gear is also provided on one side of the central shaft of the driving bevel gear 2650. 13. Furthermore, a rack 12 is provided on the swing path of the support arm 330. The rack 12 meshes with the first gear 13. The rack 12 has an arc-shaped gear ring structure, and the center of the rack 12 is coaxial with the center of the central axis 310. During the swing movement of the gravity roller 7, it drives the support arm 330 and the telescopic arm 340 to swing synchronously, which in turn drives the rack 12 to move around the central axis 310, so that the rack 12 meshes with the first gear 13 and rotates, converting the swing motion into rotational drive. The driving bevel gear 2650 and the driven bevel gear 2650... With the cooperation of 40, the drive screw 2620 and the support slide 2630 operate in combination, pushing the tension pulley 25 to move. This causes the two sets of gravity rollers 7 to move in opposite directions (during the opposite movement of the two sets of gravity rollers 7 under the winding tension, the distance between them increases, and the second transmission belt 24 becomes tensile). The two sets of tension pulleys 25 are displaced in opposite directions (the two sets of tension pulleys 25 move away from the second transmission belt 24, loosening the second transmission belt 24 to compensate for the tension and maintain the stable tension transmission characteristics of the second transmission belt 24). This compensates for the second transmission belt 24's tension caused by the opposite movement of the gravity rollers 7. When the tension of the drive belt 24 changes, and during the subsequent unidirectional movement of the two sets of gravity rollers 7 (one set of gravity rollers 7 moves upward to tension the second drive belt 24, and the other set of gravity rollers 7 moves downward to relax the second drive belt 24), the two sets of tensioning pulleys 25 are driven to move in the same direction (one side of the tensioning pulley 25 relaxes the second drive belt 24, and the other side of the tensioning pulley 25 tensions the second drive belt 24), in order to compensate for the change in the tension of the second drive belt 24 caused by the unidirectional movement of the gravity rollers 7, and provide real-time tension self-adjustment characteristics.

[0034] On the other hand, embodiments of the present invention also provide a method for real-time detection of paint film thickness on color-coated steel sheets, comprising the following steps: Step 1: The color-coated sheet after spraying and curing is pulled and conveyed from above the first idler roller 6 and the second idler roller 8 and below the two sets of gravity rollers 7, forming a double U-shaped conveying state of the color-coated sheet; Step 2: During the winding process of the color-coated sheet, the winding tension of the swing arm support component overcomes the gravity of the gravity roller 7, causing the two sets of gravity rollers 7 to swing upwards in opposite directions around the second idler roller 8. On the one hand, the color-coated sheet is clamped between the gravity roller 7 and the second idler roller 8 for roller feeding. On the other hand, the weight of the two sets of gravity rollers 7 provides tension force for the color-coated sheet, so that the color-coated sheet is kept in a self-tensioned conveying state, wrapped around the roller surface of the second idler roller 8 and clamped for roller feeding. During the roller feeding process, the thickness of the paint film is detected by the laser detection head 10. Step 3: During the roll feeding of the color-coated sheet, when an abnormal protrusion appears on the sheet surface and passes the gravity roller 7, the gravity roller 7 in contact with the abnormal protrusion is tilted and moved to make way by the swing arm support assembly. This releases the clamping state with the second idler roller 8, eliminates the clamping and conveying resistance, and relaxes the tension of the U-shaped color-coated sheet with the abnormal protrusion. Meanwhile, the gravity roller 7 on the other side, driven by the swing arm support assembly, tilts and moves in the same direction, continuously applying the clamping and rolling state to the color-coated sheet with the second idler roller 8, and increasing the tension of the U-shaped color-coated sheet on the other side. This compensates for the relaxation of the U-shaped color-coated sheet with the abnormal protrusion, ensuring that the color-coated sheet always maintains a suitable tension and smoothly transitions to the abnormal protrusion.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A real-time detection device for the paint film thickness of pre-coated steel sheets, comprising a housing (1) arranged on both sides of the conveying path of the pre-coated steel sheets, wherein, The laser detection head (10) is arranged side-by-side between two sets of housings (1), characterized in that it further includes: The second idler (8) is positioned below the laser detection head (10), and the first idler (6) is provided on both sides of the second idler (8) for traction and conveying of the color-coated plate; Two sets of gravity rollers (7) are provided, located between the first idler roller (6) and the second idler roller (8) respectively, for tensioning and conveying the color-coated plate. The two sets of gravity rollers (7) respond to the winding tension of the color-coated plate and swing upward in opposite directions to apply gravity tension to the color-coated plate and clamp the color-coated plate between the gravity roller (7) and the second idler roller (8) for roller conveying. In addition, during the tensioning and roller conveying of the color-coated plate, the two sets of gravity rollers (7) also respond to the abnormal protrusion of the color-coated plate and swing in one direction to eliminate the conveying obstruction and bounce caused by the abnormal protrusion. The swing arm support assembly is located on the movement trajectory of the gravity roller (7) and is used to drive the opposing swing action and the unidirectional swing action of the two sets of gravity rollers (7).

2. The real-time detection device for the paint film thickness of the color-coated sheet according to claim 1, characterized in that, The swing arm support assembly includes: The first chute (410) is located on the moving track of the gravity roller (7), and a second chute (420) is provided on one side of the first chute (410). Both ends of the gravity roller (7) are provided with track slides (5). The track slides (5) can slide along the first slide groove (410) to the second slide groove (420) so that when the two sets of gravity rollers (7) move in opposite directions, the two sets of track slides (5) slide along the first slide groove (410). When the two sets of gravity rollers (7) move in one direction, one set of track slides (5) slides along the second slide groove (420) and the other set of track slides (5) slides in the opposite direction along the first slide groove (410).

3. The real-time detection device for the paint film thickness of the color-coated sheet according to claim 2, characterized in that, The swing arm support assembly also includes: The central shaft (310) is located on the central shaft path of the second idler roller (8), and two sets of bushings (320) are sleeved on the central shaft (310). A support arm (330) is provided on one side of the bushing (320), and a telescopic arm (340) is provided at the telescopic end of the support arm (330). The telescopic arm (340) is connected to the track slide (5) to provide support extension for the unidirectional sway movement of the gravity roller (7). Two sets of bushings (320) are provided with two sets of limiting grooves (350) in an alternating manner along their circumference, and a sliding buckle (360) is provided on one side of the rotation path of the limiting groove (350). The sliding buckle (360) can slide along the opposite limiting groove (350) to provide a limit for the opposite swaying movement of the two sets of gravity rollers (7).

4. The real-time detection device for the paint film thickness of the color-coated sheet according to claim 3, characterized in that, The first chute (410) is an arc-shaped structure, and the center of the first chute (410) is coaxial with the axis of the second roller (8). When the gravity roller (7) slides along the first chute (410), the gravity roller (7) moves around the second roller (8) and always clamps the color-coated plate. The second slide groove (420) is a linear structure and is tangent to the second idler roller (8). When the gravity roller (7) slides along the second slide groove (420), the gravity roller (7) moves away from the second idler roller (8) and releases the clamping of the color-coated plate.

5. The real-time detection device for the film thickness of the color-coated plate according to claim 3 or 4, characterized in that, It also includes a real-time drive assembly for synchronously driving the gravity roller (7) and the second idler roller (8). The real-time drive assembly is used to drive the gravity roller (7) to maintain the clamping and feeding state of the color-coated plate with the second idler roller (8) during the movement process. The real-time drive assembly includes: The second output shaft (15) is located at both ends of the central shaft of the second idler roller (8), and a third gear (21) is provided at one end of one set of the second output shafts (15). The second input shaft (19) is located on one side of the third gear (21), wherein a second gear (20) is provided at one end of the second input shaft (19), and the second gear (20) meshes with the third gear (21); The first input shaft (11) is located on one side of the second input shaft (19), wherein a first transmission belt (17) is provided between the first input shaft (11) and the second input shaft (19).

6. The real-time detection device for the paint film thickness of the color-coated sheet according to claim 5, characterized in that, The real-time driving component also includes: The first output shaft (14) is located at both ends of the central shaft of the gravity roller (7), wherein a second transmission belt (24) is provided between the first output shaft (14) and the first input shaft (11). Tension pulleys (25) are arranged on the transmission path of the second transmission belt (24), and at least one set is provided for tension adjustment during the transmission process of the second transmission belt (24).

7. The real-time detection device for the paint film thickness of the color-coated sheet according to claim 6, characterized in that, The real-time driving component also includes: The track frame (2610) is arranged on one side of the tension pulley (25). Inside the track frame (2610), a lead screw (2620) is rotatably installed, and a support slide (2630) is provided along the axial direction of the lead screw (2620). The support slide (2630) supports the tension pulley (25). Driven bevel gear (2640) is located at one end of lead screw (2620) and meshes with driving bevel gear (2650) on one side. A first gear (13) is also provided on one side of the central shaft of driving bevel gear (2650). The support arm (330) has a rack (12) on its swing path, and the rack (12) meshes with the first gear (13).

8. The real-time detection device for the film thickness of the paint on the color-coated plate according to claim 7, characterized in that, The rack (12) is an arc-shaped gear ring structure, and the center of the rack (12) is coaxial with the center of the central axis (310).

9. The real-time detection device for paint film thickness of color-coated steel sheets according to claim 7, characterized in that, The laser detection head (10) is arranged side by side above the transmission path of the color-coated plate via the cross frame (9), and the measurement direction of the laser detection head (10) is directly above the roller body of the second idler roller (8).

10. A method for real-time detection of the paint film thickness of a color-coated sheet according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: The coated steel plate after spraying and curing is pulled and conveyed from above the first idler roller (6) and the second idler roller (8) and below the two sets of gravity rollers (7) to form a double U-shaped conveying state of the coated steel plate; Step 2: During the winding process of the color-coated sheet, the winding tension of the swing arm support component is made to overcome the gravity of the gravity roller (7) by setting the swing arm support component, which drives the two sets of gravity rollers (7) to swing upward around the second idler roller (8). On the one hand, the color-coated sheet is clamped between the gravity roller (7) and the second idler roller (8) for roller feeding. On the other hand, the weight of the two sets of gravity rollers (7) provides tension force for the color-coated sheet, so that the color-coated sheet is kept in a self-tensioned conveying state and is wrapped and clamped on the roller surface of the second idler roller (8) for roller feeding. During the roller feeding process, the thickness of the paint film is detected by the laser detection head (10). Step 3: During the roll feeding process of the color-coated plate, when an abnormal protrusion appears on the plate surface and passes through the gravity roller (7), the gravity roller (7) in contact with the abnormal protrusion is tilted and moved to make way by the setting of the swing arm support assembly, releasing the clamping state with the second idler roller (8), eliminating the clamping and conveying resistance, and relaxing the tension of the color-coated plate with the abnormal protrusion in the U-shape. Meanwhile, the gravity roller (7) on the other side is tilted and moved in the same direction under the drive of the swing arm support assembly, and together with the second idler roller (8) continuously applies the clamping and rolling state to the color-coated plate, and increases the tension of the color-coated plate in the U-shape on the other side, compensating for the relaxation of the color-coated plate in the U-shape with the abnormal protrusion, so that the color-coated plate always maintains a suitable tension and smoothly transitions to the abnormal protrusion.

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