A device and method for detecting the coating film thickness of a color coated sheet based on laser measurement

Abstract

The application discloses a color-coated plate coating film thickness detection device and method based on laser measurement, and relates to the technical field of detection. The color-coated plate coating film thickness detection device based on laser measurement comprises a conveying mechanism which is installed at the bottom of a detection table and is used for synchronously unwinding and winding the color-coated plate. Two first mounting members are fixed on the detection table. A removing mechanism for removing burrs on the surface of the color-coated plate is installed on the first mounting member. A second mounting member is fixed on the detection table and is located at the tail end of the conveying of the color-coated plate. A plurality of laser detection devices for detecting the coating thickness of the color-coated plate are installed on the second mounting member. A pressing assembly for avoiding the bulging of the color-coated plate during conveying is also installed on the second mounting member. The spiral pushing mode of the application is similar to the pushing and pulling force during the cutting of a kitchen knife. Therefore, the cutting force only acts on the burrs, and the problem that the burrs and the normal coating near the burrs are lifted together does not occur.

Description

Technical Field

[0001] This invention relates to the field of detection-related technologies, specifically to a laser-based device and method for detecting the thickness of coating film on color-coated steel sheets. Background Technology

[0002] Color-coated steel sheets are made from hot-dip galvanized steel sheets, hot-dip aluminum-zinc coated steel sheets, electro-galvanized steel sheets, etc., as substrates. After surface pretreatment (chemical degreasing and chemical conversion treatment), one or more layers of organic coating are applied to the surface, followed by baking and curing. They are named for the various colors of organic coating applied to the steel coils, and are simply called color-coated steel sheets (coils).

[0003] Existing color-coated steel sheets are produced in the form of coils. Usually, after production, in order to meet production requirements, it is necessary to test the coating thickness of the color-coated steel sheets after production is completed.

[0004] Most existing detection methods rely on laser inspection equipment to detect coating thickness. However, after the color-coated steel sheet is produced, there will be burrs on its surface. These burrs are formed during the roller coating process. Although they do not affect subsequent use, they will directly affect the results of laser inspection. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a laser-based device and method for detecting the thickness of the coating film on color-coated steel sheets, which solves the problem of burrs affecting the detection results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a laser-based device for detecting the coating thickness of color-coated steel sheets, comprising a detection stage, and further comprising:

[0007] A conveying mechanism, installed at the bottom of the testing table, is used for synchronous unwinding and rewinding of the color-coated steel sheet;

[0008] Two No. 1 mounting parts are fixed on the testing table. The No. 1 mounting parts are equipped with a removal mechanism for removing burrs from the surface of the color-coated steel sheet.

[0009] The second mounting component is fixed on the testing table and located at the tail end of the conveyor of the color-coated sheet. Several laser testing devices for detecting the coating thickness of the color-coated sheet are installed on the second mounting component, and a clamping component is also installed on the second mounting component to prevent the color-coated sheet from bulging during conveyor transport.

[0010] Furthermore, the removal mechanism includes a deburring roller rotatably mounted on the first mounting component, the deburring roller being connected to the pressing assembly, and a scraping component being provided on the deburring roller;

[0011] The top of the deburring roller is equipped with two No. 1 limit rollers via elastic elements, and No. 2 limit rollers are also rotatably installed on both sides of the deburring roller.

[0012] The first mounting component has a first movable groove arranged symmetrically, and the elastic component and the first limiting roller are installed in the first movable groove;

[0013] The elastic element includes a first guide element that is slidably installed in the first movable groove and rotatably connected to the first limiting roller, and a first spring is sleeved on the first guide element.

[0014] Furthermore, the scraping element includes a spiral groove formed on the surface of the deburring roller, through which a threaded cutting portion and a roller surface are formed;

[0015] Wherein, the pitch of the spiral groove is the same as the length of the deburring roller, and the number of turns of the spiral groove is one turn;

[0016] The slag removal component is installed on the testing platform and the first mounting component. The slag removal component, in conjunction with the deburring roller, removes the impurities generated during scraping.

[0017] Furthermore, the slag discharge component includes a slag outlet opened on the testing platform, and the slag outlet is connected to a water supply component installed at the bottom of the testing platform;

[0018] A water spray component is fixed between the two No. 1 limit rollers, and the water spray component is connected to the water supply component.

[0019] Furthermore, the pressing assembly includes a covering roller rotatably mounted on the second mounting component, a third limiting roller rotatably mounted on both sides of the covering roller, and the laser detection device located at the top of the covering roller;

[0020] The testing platform is provided with an assembly slot, in which a gear set is installed. The gear set includes a first gear and a second gear, which are connected to the shafts of the coating roller and the deburring roller respectively via two chains.

[0021] Furthermore, a second movable groove is provided on the second mounting component, and a second guide component is slidably installed in the second movable groove. A marking roller is rotatably installed on the second guide component, and a third spring is also fixed on the second guide component. The other end of the third spring is fixed to the second mounting component.

[0022] Furthermore, the conveying mechanism includes two hooks fixed to the bottom of the testing table. The two hooks are arranged in opposite directions, and each of the two hooks has a hook portion on its opposite side. A winding roller is detachably installed on the hook portion of the two hooks.

[0023] Two hooks are rotatably mounted with a second gear on one side of each other. The second gear engages with a first gear that is coaxially fixed on the winding roller. The two second gears are connected to a speed regulating component installed at the bottom of the testing table.

[0024] Furthermore, the speed regulating component includes a mounting plate fixed to the bottom of the testing platform. Two transmission rods, number one and number three, are rotatably mounted on the bottom of the mounting plate. Transmission rods number four and number two are rotatably mounted on the side of transmission rods number one and number three away from the mounting plate.

[0025] The first and third transmission rods are axially slidably equipped with progressive adjustment toothed rollers. The progressive adjustment toothed rollers are provided with transmission grooves. The progressive adjustment toothed rollers slide with the transmission bars fixed on the third and first transmission rods through the transmission grooves. The ends of the second and fourth transmission rods are coaxially fixed with driven gears that cooperate with the progressive adjustment toothed rollers.

[0026] The teeth of the progressive adjusting tooth roller are of equal length along the circumferential direction, and the tooth length of the driven gear is the same as the tooth length of the progressive adjusting tooth roller.

[0027] A bidirectional lead screw is rotatably installed between the first and third transmission rods. Two threaded transmission components are fitted onto the bidirectional lead screw. The two transmission components are rotatably connected to the ends of two progressive adjusting toothed rollers, respectively. The first and third transmission rods are connected to the bidirectional lead screw through a first transmission chain. The first and third transmission rods are connected to a drive component mounted on a mounting plate.

[0028] Furthermore, the driving component includes a motor fixed to the mounting plate, and the output shaft of the motor is connected to the first transmission rod and the third transmission rod via a third transmission chain.

[0029] This invention also provides a laser-based method for detecting the coating film thickness of pre-coated steel sheets, using the aforementioned laser-based device for detecting the coating film thickness of pre-coated steel sheets, comprising the following steps:

[0030] Step 1: The color-coated steel sheet roll is simultaneously unwound and rewound using a conveying mechanism, with the unwinding and rewinding speeds adaptively adjusted to ensure that the color-coated steel sheet is always taut during conveying.

[0031] Step 2: Remove burrs from the coated side of the color-coated steel sheet using a removal mechanism to avoid affecting the test results;

[0032] Step 3: Wrap the color-coated sheet with the clamping component to ensure that no bulges occur during testing and to ensure that the testing position is at a uniform height.

[0033] The present invention has the following beneficial effects:

[0034] I. This laser-based device for detecting the coating thickness of color-coated steel sheets enables simultaneous unwinding and rewinding of color-coated steel sheet rolls via a conveying mechanism.

[0035] The unwinding speed gradually decreases as the diameter of the color-coated steel sheet roll decreases while its rotational speed gradually increases, while the rewinding speed gradually decreases as the diameter of the color-coated steel sheet roll increases, so that the color-coated steel sheet is always in a taut state during transportation.

[0036] II. The laser-based coating film thickness detection device for color-coated steel sheets removes burrs from the coating surface of the color-coated steel sheets through a removal mechanism.

[0037] The cutting method of the present invention differs from similar structures in other fields. Existing cutting methods use a vertical blade to cut in a straight line, while the present invention cuts by spiraling the threaded cutting part.

[0038] Both methods involve cutting, but their effects are fundamentally different. A straight-line cutting method may not only remove burrs but also lift up the normal coating near the burrs due to the high rotation speed of the deburring roller. However, the spiral propulsion method of this invention has a push-pull force similar to that of a kitchen knife, so the cutting force is only applied to the burrs, thus avoiding the problem of lifting up the burrs and the normal coating near the burrs.

[0039] Third, the laser-based color-coated steel sheet coating film thickness detection device limits the color-coated steel sheet by two No. 3 limit rollers, so that the back of the color-coated steel sheet is covered onto the covering roller. The tension of the conveyor can make the color-coated steel sheet adhere to the surface of the covering roller, so that the test position of the color-coated steel sheet will not bulge, and thus the horizontal conveying will not have unevenness due to the yield strength of the color-coated steel sheet.

[0040] 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

[0041] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 for Figure 1 A structural diagram from another direction;

[0043] Figure 3 This is a schematic diagram of the clamping assembly and the removal mechanism in this invention;

[0044] Figure 4 This is a plan view of the clamping assembly and the removal mechanism in this invention;

[0045] Figure 5 This is a schematic diagram of the conveying mechanism in this invention;

[0046] Figure 6 for Figure 5 Exploded view;

[0047] Figure 7 This is a schematic diagram of the planar structure of the conveying mechanism in this invention;

[0048] Figure 8 This is a schematic diagram of the transmission bar and transmission groove in this invention;

[0049] Figure 9 This is a schematic diagram of the de-burring roller in this invention;

[0050] Figure 10 for Figure 9 Enlarged view of the local structure at point A;

[0051] Figure 11 This is a schematic diagram showing the location of the delivery pump in this invention.

[0052] In the diagram: 1. Inspection table; 101. Through groove; 102. Guide roller; 103. Lower impurity outlet; 2. Mounting component No. 1; 201. Limiting roller No. 1; 202. Deburring roller; 203. Limiting roller No. 2; 204. Water spray component; 205. Guide component No. 1; 206. Spring No. 1; 2021. Thread cutting section; 2022. Roller surface; 3. Mounting component No. 2; 301. Laser inspection equipment; 302. Covering roller; 303. Marking roller; 304. Limiting roller No. 3; 305. Guide component No. 2; 306. Spring No. 3; 4. Mounting plate; 401. No. 1 402. Transmission rod; 403. Transmission rod 3; 404. Transmission rod 4; 405. Transmission chain 1; 406. Double-acting lead screw; 407. Transmission component; 408. Driven gear; 409. Progressive adjusting toothed roller; 4010. Transmission groove; 4011. Transmission bar; 5. Hook and hanger; 501. Winding roller; 502. Gear 1; 503. Gear 2; 504. Transmission chain 2; 6. Gear set; 601. Chain; 7. Motor; 701. Transmission chain 3; 9. Circulation box; 901. Conveying pump; 902. Conveying pipe. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] The following is based on Figures 1-11 This invention describes a laser-based coating film thickness detection device for color-coated steel sheets, as provided in an embodiment of the present invention.

[0056] like Figures 1-11 As shown, this embodiment of the invention provides a technical solution: a laser-based coating film thickness detection device for color-coated steel sheets, including a detection platform 1 and a conveying mechanism installed at the bottom of the detection platform 1 for synchronous unwinding and rewinding of color-coated steel sheets.

[0057] Two mounting parts 2 are fixed on the testing table 1. The mounting parts 2 are equipped with a removal mechanism for removing burrs from the surface of the color-coated steel sheet.

[0058] The second mounting component 3 is fixed on the testing table 1 and located at the tail end of the conveyor of the color-coated plate. Several laser testing devices 301 for detecting the coating thickness of the color-coated plate are installed on the second mounting component 3. The second mounting component 3 is also equipped with a clamping component to prevent the color-coated plate from bulging during conveyor transport.

[0059] In this embodiment of the invention, the color-coated steel sheet is synchronously wound and unwound by a conveying mechanism, so that the color-coated steel sheet is conveyed during the unwinding and winding process.

[0060] The burrs on the coated side of the color-coated steel sheet are removed by a removal mechanism to avoid errors in the test results caused by burrs.

[0061] During the transport of pre-coated steel sheets, the coating thickness is measured using a laser inspection device 301. However, because pre-coated steel sheets are thin metal plates with a certain yield strength, they are prone to deformation during transport, making it difficult to maintain ideal flatness (horizontal state), thus affecting the inspection accuracy. This invention solves this problem by applying a clamping component to constrain the pre-coated steel sheet in the inspection area, keeping it flat.

[0062] The removal mechanism includes a deburring roller 202 rotatably mounted on mounting component 2, the deburring roller 202 being connected to a pressing assembly, and a scraping component being provided on the deburring roller 202.

[0063] Two first limit rollers 201 are installed on the top of the deburring roller 202 via elastic elements, and second limit rollers 203 are also rotatably installed on both sides of the deburring roller 202.

[0064] The first movable groove is provided on the first mounting component 2 in a symmetrical arrangement, and the elastic component and the first limiting roller 201 are installed in the first movable groove.

[0065] The elastic element includes a first guide 205 that is slidably installed in the first movable groove and rotatably connected to the first limit roller 201, and a first spring 206 is sleeved on the first guide 205.

[0066] In this embodiment of the invention, the color-coated sheet is limited by two second-position limiting rollers 203 and a first-position limiting roller 201, so that the front side (coated side) of the color-coated sheet is covered by the deburring roller 202.

[0067] Specifically, by setting the two No. 1 limit rollers 201 to an inclined sliding state, and using the elastic potential energy of the No. 1 spring 206 to adjust the tightness of the color-coated plate covering the deburring roller 202, the coating thickness of the color-coated plate will not be uneven, and the tightness of the covering will not be too loose or too tight.

[0068] Driven by the clamping component, the deburring roller 202 rotates. As the deburring roller 202 rotates, the scraping component removes the burrs from the coating surface of the color-coated steel sheet. Of course, this scraping does not only remove burrs, but also small protrusions and strip-shaped protrusions caused by the coating process. Its main function is to level the coating surface of the color-coated steel sheet.

[0069] The de-burring roller 202 rotates in the opposite direction to the conveying of the color-coated sheet. For example, if the color-coated sheet is conveyed from right to left, then the de-burring roller 202 rotates clockwise.

[0070] The scraping component includes a spiral groove formed on the surface of the deburring roller 202, through which a thread cutting portion 2021 and a roller surface portion 2022 are formed.

[0071] The pitch of the spiral groove is the same as the length of the deburring roller 202, and the spiral groove has one turn.

[0072] A slag removal component is installed on the testing table 1 and the first mounting component 2. The slag removal component, in conjunction with the deburring roller 202, removes the impurities generated during scraping.

[0073] In this embodiment of the invention, the thread cutting part 2021 is the main scraping or cutting part, and the roller surface 2022 is the surface of the deburring roller 202 that is used to contact the color-coated plate.

[0074] When the color-coated steel sheet is wrapped onto the deburring roller 202, the actual wrapping position is the roller surface 2022, while the burrs on the coating surface of the color-coated steel sheet extend into the spiral groove. The burrs in the spiral groove will be cut off by the rotation of the deburring roller 202. The cut burrs will be temporarily stored in the spiral, and then discharged to the designated position through the cooperation of the slag discharge part and the spiral groove.

[0075] The cutting method of this invention differs from similar structures in other fields. Existing cutting methods involve a vertical blade, cutting in a straight line. In contrast, this invention cuts by spiraling the threaded cutting part 2021.

[0076] Both methods involve cutting, but their effects are fundamentally different. A straightforward cutting method may not only remove burrs but also lift up the normal coating near the burrs due to the high rotation speed of the deburring roller 202. However, the spiral propulsion method of this invention has a pushing and pulling force similar to that of a kitchen knife, so the cutting force is only applied to the burrs, thus avoiding the problem of lifting up the burrs and the normal coating near the burrs.

[0077] Secondly, when the color-coated sheet is wrapped onto the deburring roller 202, the spiral groove is actually a spiral tube with open ends. Impurities inside it will be transported in one direction due to its rotation, which is similar to the conveying principle of a spiral auger.

[0078] The slag discharge component includes a slag discharge port 103 opened on the testing platform 1, which is connected to a water supply component installed at the bottom of the testing platform 1.

[0079] A water spray component 204 is fixed between the two No. 1 limit rollers 201, and the water spray component 204 is connected to the water supply component.

[0080] In this embodiment of the invention, the water supply component includes a circulation tank 9 fixed to the bottom of the testing platform 1 and connected to the lower miscellaneous outlet 103. A delivery pump 901 is fixed to the bottom of the testing platform 1. The output end of the delivery pump 901 is connected to the water spray component 204 through the delivery pipe 902, and the input end of the delivery pump 901 is connected to the circulation tank 9.

[0081] The circulation tank 9 is equipped with a filtration device, which filters impurities and then recycles the water.

[0082] When the delivery pump 901 is working, it supplies water to the water spray component 204. The water spray component 204 sprays the water onto the deburring roller 202. The water and the rotation of the deburring roller 202 transport the impurities in the spiral groove to the lower impurity outlet 103 for discharge, so that both water and impurities enter the circulation box 9. The water is then filtered by the filtration equipment in the circulation box 9 and pumped back for use.

[0083] Secondly, since the rotation direction of the deburring roller 202 is opposite to the conveying direction of the color-coated sheet, spraying water onto the deburring roller 202 can reduce the friction between the deburring roller 202 and the color-coated sheet, thus avoiding scratching the color-coated sheet.

[0084] The pressing assembly includes a covering roller 302 rotatably mounted on the second mounting component 3, a third limiting roller 304 rotatably mounted on both sides of the covering roller 302, and a laser detection device 301 located at the top of the covering roller 302.

[0085] The testing table 1 has an assembly slot, in which a gear set 6 is installed. The gear set 6 includes a first gear and a second gear. The first gear and the second gear are respectively connected to the shafts of the coating roller 302 and the deburring roller 202 via two chains 601.

[0086] In this embodiment of the invention, the color-coated plate is limited by two No. 3 limiting rollers 304, so that the back of the color-coated plate is covered onto the covering roller 302. The tension of the conveying can make the color-coated plate adhere to the surface of the covering roller 302, so that the test position of the color-coated plate will not bulge, and thus the horizontal conveying will not have unevenness due to the yield strength of the color-coated plate.

[0087] Secondly, the surfaces of the No. 3 limiting roller 304 and the coating roller 302 are provided with anti-slip layers to increase the friction between the color-coated plate and the coating roller 302 and the No. 3 limiting roller 304, so as to drive the coating roller 302 to rotate when the color-coated plate is conveyed. When the coating roller 302 rotates, it drives the deburring roller 202 to rotate in the opposite direction through the chain 601 and the gear set 6.

[0088] When the coating roller 302 rotates, the direction of rotation of the coating roller 302 is towards the forward direction of the color-coated plate conveying, while the deburring roller 202 is in the opposite direction to the coating roller 302. The coating roller 302 and the deburring roller 202 rotate relative to each other.

[0089] The second mounting component 3 has a second movable groove, in which a second guide component 305 is slidably installed. A marking roller 303 is rotatably installed on the second guide component 305, and a third spring 306 is also fixed on the second guide component 305. The other end of the third spring 306 is fixed to the second mounting component 3.

[0090] In this embodiment of the invention, the marking roller 303 is initially positioned at the beginning of the second active groove stroke due to the initial elasticity of the No. 3 spring 306. When the color-coated plate is covered onto the covering roller 302 for conveying, the color-coated plate and the marking roller 303 are in a clearance fit state, that is, there is a very small gap between the two, but they will not contact each other.

[0091] When the raised part on the color-coated sheet is conveyed to the marking roller 303, it will come into contact with the marking roller 303 and drive it to rotate, thereby rolling the paint attached to the marking roller 303 onto the raised part of the color-coated sheet to achieve the marking function.

[0092] The conveying mechanism includes two hooks 5 fixed to the bottom of the testing table 1. The two hooks 5 are arranged in a mirror symmetrical manner, and hooks are provided on opposite sides of the two hooks 5. A winding roller 501 is detachably installed on the hooks of the two hooks 5.

[0093] Among them, each hook 5 consists of two identical load-bearing components, located on both sides of the width of the testing platform 1.

[0094] Two hooks 5 are rotatably mounted with a second gear 503 on one side opposite each other. The second gear 503 cooperates with the first gear 502, which is coaxially fixed on the winding roller 501. The two second gears 503 are connected to the speed regulating component installed at the bottom of the testing table 1.

[0095] In this embodiment of the invention, the two second gears 503 are driven by a speed regulating component installed at the bottom of the detection table 1, so as to drive the two winding rollers 501 to rotate through the meshing of the second gear 503 and the first gear 502. The two winding rollers 501 are used for unwinding and rewinding respectively.

[0096] like Figure 4 As shown, two winding rollers 501 are placed in the hook part of the hook member 5 to suspend the two winding rollers 501 to the bottom of the inspection table 1. The inspection table 1 also has through grooves 101 on both sides. Guide rollers 102 for guiding the color-coated plate are installed in the through grooves 101. In actual operation, the winding rollers 501 can be removed from the hook part of the hook member 5. When installing, the winding rollers 501 only need to be placed in the hook part of the hook member 5. It should be noted that the reason why the winding rollers 501 will not fall off when they are in the hook groove of the hook member 5 is that the hook groove of the hook member 5 is inclined and the winding rollers 501 have a certain weight. When the winding rollers 501 rotate, the force is not enough to make the winding rollers 501 fall off the hook groove of the hook member 5.

[0097] The speed control component is used to drive the two No. 2 gears 503 to rotate synchronously, with the rotation speed of one No. 2 gear 503 gradually increasing and the other gradually decreasing.

[0098] The speed control assembly includes a mounting plate 4 fixed to the bottom of the testing table 1. Two transmission rods 401 and 403 are rotatably mounted on the bottom of the mounting plate 4. A transmission rod 404 and a transmission rod 402 are rotatably mounted on the side of the transmission rods 401 and 403 away from the mounting plate 4.

[0099] A progressive adjusting toothed roller 409 is axially slidably mounted on both the first transmission rod 401 and the third transmission rod 403. The progressive adjusting toothed roller 409 is provided with a transmission groove 4010. The progressive adjusting toothed roller 409 slides in cooperation with the transmission bar 4011 fixed on the third transmission rod 403 and the first transmission rod 401 through the transmission groove 4010. The ends of the second transmission rod 402 and the fourth transmission rod 404 are coaxially fixed with driven gears 408 that cooperate with the progressive adjusting toothed roller 409.

[0100] Among them, the teeth of the progressive adjusting tooth roller 409 are of equal length along the circumferential direction, and the tooth length of the driven gear 408 is the same as the tooth length of the progressive adjusting tooth roller 409.

[0101] A bidirectional lead screw 406 is rotatably installed between the first transmission rod 401 and the third transmission rod 403. Two transmission components 407 with threaded engagement are sleeved on the bidirectional lead screw 406. The two transmission components 407 are rotatably connected to the ends of the two progressive adjusting toothed rollers 409, respectively. The first transmission rod 401 and the third transmission rod 403 are connected to the bidirectional lead screw 406 through the first transmission chain 405. The first transmission rod 401 and the third transmission rod 403 are connected to the drive component installed on the mounting plate 4.

[0102] In this embodiment of the invention, the first transmission rod 401 and the third transmission rod 403 are driven to rotate by a driving component. When the third transmission rod 403 and the first transmission rod 401 rotate, the first transmission chain 405 synchronously drives the bidirectional lead screw 406 to rotate.

[0103] When the first transmission rod 401 and the third transmission rod 403 rotate, the two progressive adjusting toothed rollers 409 are driven to rotate synchronously with the first transmission rod 401 and the third transmission rod 403 through the cooperation of the transmission bar 4011 and the transmission groove 4010. At the same time, due to the presence of the transmission bar 4011 and the transmission groove 4010, the progressive adjusting toothed rollers 409 can slide axially on the first transmission rod 401 or the third transmission rod 403.

[0104] Since the bidirectional lead screw 406 rotates synchronously with the first transmission rod 401 and the third transmission rod 403, the two progressive adjusting toothed rollers 409 are driven to rotate relative to or in opposite directions through the threaded engagement of the bidirectional lead screw 406 and the transmission component 407 while the first transmission rod 401 and the third transmission rod 403 are rotating.

[0105] like Figure 6As shown, the two driven gears 408 are in the same position. When the progressive adjusting toothed roller 409 on the third transmission rod 403 rotates, it drives the fourth transmission rod 404 to rotate through the meshing of its surface teeth with the driven gear 408 on the fourth transmission rod 404. This is a minimum tooth transmission, that is, an incomplete gear driving a complete gear. When the third transmission rod 403 rotates, it drives one of the second transmission chains 504 to rotate a second gear 503 at the unwinding end. As the progressive adjusting toothed roller 409 gradually moves axially with the rotation, the number of teeth meshing with the driven gear 408 gradually increases. The technical effect achieved is that the rotation angle or number of turns of the winding roller 501 used for unwinding gradually increases with the rotation of the unwinding. Figure 4 and Figure 7 As shown.

[0106] like Figure 7 As shown, the structures on both sides of the bidirectional lead screw 406 are the same. That is to say, the transmission principle of the progressive adjusting toothed roller 409 on the first transmission rod 401 and the driven gear 408 on the second transmission rod 402 is basically the same as described above. The only difference is that the axial movements of the two progressive adjusting toothed rollers 409 are opposite. The desired technical effect is that the angle or number of rotations of the winding roller 501 used for winding gradually decreases as the winding rotates.

[0107] The effect achieved in this embodiment is that the rotation angle or number of turns of the two winding rollers 501 is adaptively adjusted according to the unwinding and rewinding, so that the color-coated plate is always in a taut state when the unwinding and rewinding are carried out simultaneously.

[0108] It should also be noted that, Figure 7 The dashed arrows indicate the rotation direction of the corresponding components, which helps in understanding the working principle described above.

[0109] The driving component includes a motor 7 fixed on the mounting plate 4. The output shaft of the motor 7 is connected to the first transmission rod 401 and the third transmission rod 403 via the third transmission chain 701.

[0110] In this embodiment of the invention, when the motor 7 is working, its output shaft drives the first transmission rod 401 and the third transmission rod 403 to rotate through the third transmission chain 701.

[0111] In summary, the synchronous unwinding and rewinding of the color-coated steel sheet is achieved by driving the two winding rollers 501 to rotate synchronously through the conveying mechanism.

[0112] During the synchronous unwinding and rewinding of the color-coated steel sheet by the two winding rollers 501, the color-coated steel sheet is in a conveying state between the two winding rollers 501. In the conveying state, the color-coated steel sheet is limited and wrapped around the deburring roller 202. With the help of the rotation of the deburring roller 202, the burrs on the coated side of the color-coated steel sheet are removed, and the deburring roller 202 also has the function of conveying the burrs.

[0113] Meanwhile, the limiting roller 304 ensures that the color-coated sheet is wrapped around the covering roller 302, guaranteeing a consistent height of the sheet during transport. This prevents inaccurate measurement data due to height deviations during transport when the laser inspection equipment 301 measures the coating thickness.

[0114] This invention also provides a laser-based method for detecting the coating film thickness of pre-coated steel sheets, using the aforementioned laser-based device for detecting the coating film thickness of pre-coated steel sheets, comprising the following steps:

[0115] Step 1: The color-coated steel sheet roll is simultaneously unwound and rewound using a conveying mechanism, with the unwinding and rewinding speeds adaptively adjusted to ensure that the color-coated steel sheet is always taut during conveying.

[0116] Step 2: Remove burrs from the coated side of the color-coated steel sheet using a removal mechanism to avoid affecting the test results;

[0117] Step 3: Wrap the color-coated sheet with the clamping component to ensure that no bulges occur during testing and to ensure that the testing position is at a uniform height.

[0118] 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.

[0119] 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 laser-based device for detecting the thickness of a color-coated steel sheet coating, comprising a detection stage (1), characterized in that, Also includes: The conveying mechanism is installed at the bottom of the testing table (1) and is used to simultaneously unwind and rewind the color-coated steel sheet; Two No. 1 mounting parts (2) are fixed on the testing table (1). The No. 1 mounting parts (2) are equipped with a removal mechanism for removing burrs from the surface of the color-coated steel sheet. The second mounting component (3) is fixed on the testing table (1) and located at the tail end of the conveying of the color-coated plate. Several laser testing devices (301) for detecting the coating thickness of the color-coated plate are installed on the second mounting component (3). A clamping component for preventing the color-coated plate from bulging during conveying is also installed on the second mounting component (3). The conveying mechanism includes two hooks (5) fixed to the bottom of the detection table (1). The two hooks (5) are arranged in opposite directions. Each of the two hooks (5) has a hook part on its opposite side. A winding roller (501) is detachably installed on the hook part of the two hooks (5). Two hooks (5) are rotatably mounted with a second gear (503) on one side of each other. The second gear (503) cooperates with the first gear (502) which is coaxially fixed on the winding roller (501). The two second gears (503) are connected to the speed regulating component installed at the bottom of the detection table (1). The speed control assembly includes a mounting plate (4) fixed to the bottom of the testing platform (1). Two transmission rods (401) and three transmission rods (403) are rotatably mounted on the bottom of the mounting plate (4). A transmission rod (404) and a transmission rod (402) are rotatably mounted on the side of the transmission rods (401) and three transmission rods (403) away from the mounting plate (4). The first transmission rod (401) and the third transmission rod (403) are both axially slidably mounted with a progressive adjustment toothed roller (409). The progressive adjustment toothed roller (409) is provided with a transmission groove (4010). The progressive adjustment toothed roller (409) slides with the transmission bar (4011) fixed on the third transmission rod (403) and the first transmission rod (401) through the transmission groove (4010). The ends of the second transmission rod (402) and the fourth transmission rod (404) are both coaxially fixed with a driven gear (408) that cooperates with the progressive adjustment toothed roller (409). Among them, the teeth of the progressive adjustment tooth roller (409) increase in length at equal intervals along the circumferential direction, and the tooth length of the driven gear (408) is the same as the tooth length of the progressive adjustment tooth roller (409). A bidirectional lead screw (406) is rotatably installed between the first drive rod (401) and the third drive rod (403). Two drive components (407) with threaded engagement are sleeved on the bidirectional lead screw (406). The two drive components (407) are rotatably connected to the ends of two progressive adjusting toothed rollers (409), respectively. The first drive rod (401) and the third drive rod (403) are connected to the bidirectional lead screw (406) through the first drive chain (405). The first drive rod (401) and the third drive rod (403) are connected to the drive component installed on the mounting plate (4).

2. The laser measurement-based coated color plate coating film thickness detection device according to claim 1, characterized by: The removal mechanism includes a deburring roller (202) rotatably mounted on the first mounting component (2), the deburring roller (202) being connected to the pressing assembly, and a scraping component being provided on the deburring roller (202); The top of the deburring roller (202) is equipped with two No. 1 limit rollers (201) through elastic elements, and No. 2 limit rollers (203) are also rotatably installed on both sides of the deburring roller (202). The first mounting component (2) is provided with a first movable groove arranged symmetrically, and the elastic component and the first limiting roller (201) are installed in the first movable groove; The elastic element includes a first guide (205) which is slidably installed in the first movable groove and rotatably connected to the first limiting roller (201), and a first spring (206) is sleeved on the first guide (205).

3. The laser measurement-based coated color plate coating film thickness detection device according to claim 2, characterized in that: The scraping component includes a spiral groove formed on the surface of the deburring roller (202), through which a thread cutting portion (2021) and a roller surface portion (2022) are formed. The pitch of the spiral groove is the same as the length of the deburring roller (202), and the spiral groove has one turn. The slag removal component is installed on the testing table (1) and the first mounting component (2). The slag removal component and the deburring roller (202) work together to remove the impurities generated during scraping.

4. The laser measurement-based coated color plate coating film thickness detection device according to claim 3, characterized in that: The slag discharge component includes a slag discharge port (103) opened on the testing platform (1), and the slag discharge port (103) is connected to a water supply component installed at the bottom of the testing platform (1); A water spray component (204) is fixed between the two No. 1 limit rollers (201), and the water spray component (204) is connected to the water supply component.

5. The laser measurement-based coated color plate coating film thickness detection device according to claim 2, characterized in that: The pressing assembly includes a covering roller (302) rotatably mounted on the second mounting component (3), and a third limiting roller (304) rotatably mounted on both sides of the covering roller (302). The laser detection device (301) is located on top of the covering roller (302). The testing table (1) is provided with an assembly slot, and a gear set (6) is installed in the assembly slot. The gear set (6) includes a first gear and a second gear. The first gear and the second gear are respectively connected to the shafts of the coating roller (302) and the deburring roller (202) through two chains (601).

6. The laser measurement-based coated color coil coating film thickness detection device according to claim 5, characterized in that: The second mounting component (3) has a second movable groove, and a second guide component (305) is slidably installed in the second movable groove. A marking roller (303) is rotatably installed on the second guide component (305), and a third spring (306) is also fixed on the second guide component (305). The other end of the third spring (306) is fixed to the second mounting component (3).

7. The laser-based coating film thickness detection device for color-coated steel sheets according to claim 1, characterized in that: The driving component includes a motor (7) fixed on the mounting plate (4), and the output shaft of the motor (7) is connected to the first transmission rod (401) and the third transmission rod (403) through the third transmission chain (701).

8. A method for detecting the coating film thickness of a color coated sheet based on laser measurement, using the apparatus for detecting the coating film thickness of a color coated sheet based on laser measurement according to any one of claims 1 to 7, characterized in that: Includes the following steps: Step 1: The color-coated steel sheet roll is simultaneously unwound and rewound using a conveying mechanism, with the unwinding and rewinding speeds adaptively adjusted to ensure that the color-coated steel sheet is always taut during conveying. Step two, remove the burr of the coating side of the color coated sheet by removing mechanism to avoid affecting the detection result; Step three, cover the color coated sheet by pressing assembly to ensure that there is no bulge during detection and the height of detection position is uniform.

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