A kind of cold-rolled roll chromium plating layer defect repairing device

Abstract

The application discloses a kind of cold-rolled roller chrome plating layer defect repair devices, it is related to metal rolling equipment technical field.The device includes workbench, first supporting roll, load roll, second supporting roll, cold-rolled roller, repair device and shroud;Repair device includes support, recess, driving motor, screw rod, slot block and composite repair execution mechanism.Support is fixed to the side of cold-rolled roller, and composite repair execution mechanism can be moved radially by driving motor.Three load-bearing structures that can move synchronously in axial direction are integrated in composite repair execution mechanism, respectively carrying online detection module, laser cleaning head and cold spraying deposition head, and loading assembly that can automatically adjust angle is arranged on each load-bearing structure.It is close to cold-rolled roller when repairing, scanning and identifying defects, and driving laser cleaning head and cold spraying deposition head to clean and deposit repair defects in turn.The application realizes the online, automatic repair of cold-rolled roller, shortens maintenance time, and guarantees the continuity of rolling production.

Description

Technical Field

[0001] This invention relates to the field of metal rolling equipment technology, specifically to a device for repairing defects in the chromium plating layer of cold rolling rolls. This device is installed on a rolling mill production line for rapid and precise online repair of surface defects on the rolls during planned shutdowns or production breaks. Background Technology

[0002] Cold rolling rolls are core components in the strip rolling process. Their surfaces are usually plated with a hard chrome layer to improve wear resistance and surface quality. Under high-speed, high-pressure continuous rolling conditions, the chrome plating on the roll surface is prone to defects such as local peeling and scratches due to fatigue, foreign object intrusion, or process fluctuations. These defects will be directly copied onto the strip surface, leading to product downgrading. In severe cases, they may even cause rolling vibration, affecting production safety and efficiency.

[0003] Currently, the repair of surface defects on rolls is mostly carried out offline, requiring the rolls to be removed from the mill and transported to a separate repair workshop for processing. For example, Chinese patent application number CN202210355726.1 discloses a roll surface defect detection and repair system and its working method. This system uses a roll drive assembly to rotate the roll along an arc-shaped roll repair surface. While the roll rotates, a visual inspection device records the defects on the roll surface. After determining the location and size of the defects, an additive manufacturing feeding device injects an appropriate amount of additive powder into the roll support repair platform. Then, the conductive circuit formed by the tangential contact between the roll and the roll support surface melts the additive powder located at the bottom of the arc-shaped roll repair surface and fills the wear defect. Finally, the weight of the roll itself presses the molten additive powder into the wear defect, thus achieving repair.

[0004] However, existing repair methods for repairing defects on the surface of cold rolling rolls have long repair cycles, leading to increased unplanned downtime of the rolling mill and seriously affecting production efficiency. Furthermore, the loading, unloading, and transportation during the repair process also increase the risk of roll damage and operating costs. In addition, existing repair processes such as electrothermal cladding have large heat inputs, which may change the roll matrix structure and introduce thermal stress, affecting the dimensional accuracy and service life of the repaired roll. Summary of the Invention

[0005] The purpose of this invention is to provide a device for repairing defects in the chromium plating layer of cold rolling rolls, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for repairing defects in the chromium plating layer of a cold rolling roll includes a workbench. From left to right, a first support roll, a carrier roll, and a second support roll are arranged in the upper part of the workbench. The top ends of the carrier roll and the second support roll are located on the same horizontal plane. A cold rolling roll is arranged directly above the carrier roll. A protective cover is provided on the top side of the cold rolling roll. A repair device is locked and fixed inside the protective cover and is located on the side of the cold rolling roll.

[0008] The repair device includes a bracket, which is fastened to the inside of the cover by bolts on both sides. Grooves are formed on the opposing sides of the bracket, and a drive motor is locked and fixed in each of the two grooves. A helical rod is connected to the left output end of each of the two drive motors, and the helical rod is rotatably connected inside the groove block. The opposing sides of the two groove blocks are fixed to the bracket. An internally threaded sleeve is threaded onto the outer surface of the helical rod, and the internally threaded sleeve is slidably connected inside the groove block. The opposing sides of the two internally threaded sleeves are locked and fixed to a composite repair actuator. This composite repair actuator is arranged parallel to the axis of the cold rolling roll and is used to perform online inspection, laser cleaning, and cold spray deposition repair operations on the surface of the cold rolling roll.

[0009] Preferably, the composite repair actuator includes a base plate that is fastened to two internal threaded sleeves on both sides. A first motor is locked and fixed to the top left rear side of the base plate. A screw is connected to the right output end of the first motor. A pad is wrapped around the left side of the outer surface of the screw, and the bottom of the pad is locked and fixed to the base plate. A first support structure, a second support structure, and a third support structure are sequentially wrapped around the outer surface of the screw from left to right. The first support structure, the second support structure, and the third support structure are fastened to each other. An internal threaded ring is embedded and fixed inside the front side of the first support structure. The inner side is threadedly connected to the screw; the third support structure is used to install an online scanning laser displacement sensor and a high-resolution CCD camera for scanning the cold rolling roll; the second support structure is used to install a laser cleaning head for emitting pulsed lasers to remove chromium plating or contaminants from defects on the cold rolling roll; the first support structure is used to install a cold spray deposition head for spraying metal powder onto the laser-cleaned area of ​​the cold rolling roll to form a deposition layer; guide rods slide through the lower front sides of the first, second, and third support structures, and the guide rods are fixed to the front top of the base plate.

[0010] Preferably, the first support structure, the second support structure, and the third support structure have the same structure and size. The first support structure, the second support structure, and the third support structure all have a through-hole with a diameter larger than that of the screw at the same position on the front side. An internal threaded ring is embedded and fixed in the through-hole of the first support structure.

[0011] Preferably, a first support block is installed on the left front side of the second support structure, and a second support block is installed on the left front side of the third support structure. Both the first and second support blocks are wrapped around and slide on the surface of the guide rod, and the bottoms of both the first and second support blocks are in sliding contact with the base plate.

[0012] Preferably, the first support structure includes a frame that wraps around the outside of the screw and guide rod. A second motor is locked and fixed to the front top of the frame. A lead screw is connected to the rear output end of the second motor. A shift seat is connected to the outer surface of the lead screw to drive the shift seat to move back and forth. A lower cylinder is locked and fixed to the middle top of the shift seat. An upper cylinder is slidably inserted into the upper middle part of the lower cylinder and fastened to the inner side of the lower cylinder by a positioning bolt. A positioning frame is fastened to the rear side of the upper cylinder. A loading assembly is locked and fixed to the rear side of the positioning frame. A column sleeve is fixed to the upper middle part of the front of the loading assembly.

[0013] Preferably, the shifting seat has an internal threaded block on its inner side, and the inner side of the internal threaded block is threadedly connected to the lead screw. The bottom of the shifting seat is inserted and slidably placed inside the carrier frame. The column sleeve is hollow inside, and the hollow part is connected to the inside of the loading assembly.

[0014] Preferably, the loading assembly includes a protective cover fixed to the positioning frame at the front center. The rear of the protective cover is arc-shaped and has a sealing strip around its perimeter. A through sleeve is provided on the upper center of the inside of the protective cover, and the through sleeve corresponds to the position of the column sleeve. A protective seat is fixedly connected to the front center of the inside of the protective cover. A driving component is installed on the middle left side of the protective seat, and the right side of the driving component is connected to the displacement component to drive the rear of the displacement component to move in an arc-shaped trajectory. A loading plate is connected to the arc-shaped trajectory execution point of the displacement component.

[0015] Preferably, the driving component includes a housing fixed to the front side of the protective seat, a third motor locked and fixed inside the upper side of the housing, a worm gear connected to the rear output end of the third motor, the rear end of the worm gear being rotatably connected to the housing, and the bottom side of the worm gear meshing with a worm wheel, the middle side of the worm wheel being connected to a displacement component.

[0016] Preferably, the displacement component includes a crossbeam fixed to the front of the guard seat, a shaft rod rotatably extending through the inner rear part of the crossbeam, the left end of the shaft rod being connected to a worm gear, and the other end of the shaft rod being connected to a rotating rod, the end of the rotating rod away from the shaft rod being rotatably connected to a slider, and the slider being slidably connected inside a rectangular frame, a guide block being fixedly connected to the middle right side of the rectangular frame to form a cross structure, the guide block being slidably connected inside a limiting frame, and the upper and lower sides of the limiting frame being fixedly connected to the guard seat, a sliding sleeve being wrapped around the rear right side of the rectangular frame, and a push rod being connected to the sliding sleeve, the end of the push rod away from the sliding sleeve being rotatably connected to a displacement sleeve, the displacement sleeve being wrapped around the outer side of an arc-shaped frame, and the upper and lower sides of the arc-shaped frame being fixed to the guard seat, and the rear side of the displacement sleeve being locked and fixed to the loading plate.

[0017] Preferably, the displacement sleeve is arc-shaped and has an arc-shaped hollow slot inside. The shape of the hollow slot is adapted to the shape of the arc frame. A protruding post is provided in the middle of the left side of the displacement sleeve, and the protruding post is inserted into and rotates inside the push rod.

[0018] In addition, the present invention also provides an online repair method for defects in the chromium plating layer of cold rolling rolls using the above-mentioned device, comprising the following steps:

[0019] S1. When the rolling mill is in a planned shutdown or production gap, the repair device is started, and the screw is driven to rotate by two drive motors, thereby driving the composite repair actuator to move radially to a preset working position close to the side surface of the cold rolling roll.

[0020] S2. Drive the cold rolling roll to rotate, and at the same time control the composite repair actuator to move along the axial direction of the cold rolling roll, and use the online detection module on it to scan the surface of the cold rolling roll to identify and locate defects;

[0021] S3. Based on the defect location information, control the composite repair actuator to move, position the laser cleaning head to the defect area, adjust its angle and then perform laser cleaning.

[0022] S4. Control the movement of the composite repair actuator, position the cold spray deposition head to the cleaned defect area, adjust its angle and perform cold spray deposition.

[0023] S5. Repeat steps S3 and S4 to complete the repair of all identified defects;

[0024] S6. Control the composite repair actuator to retract radially to a safe position, and the repaired cold rolling roll can be put into subsequent rolling production.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The repair device of this invention is directly integrated into the rolling mill production line via a bracket. It can be quickly positioned and perform repair operations within the planned downtime window of the rolling mill, realizing true online or near-line repair. This method avoids the long-term unplanned downtime caused by the disassembly and transportation of rolls in traditional processes, greatly shortens the maintenance cycle, and ensures the continuity and efficiency of rolling production.

[0027] This invention integrates two processes: laser cleaning and cold spray deposition. Laser cleaning can precisely remove defects without contact and without damaging the substrate. The cold spray process deposits materials in a solid state, with extremely low heat input throughout the process. This fundamentally avoids problems such as deformation of the roll substrate, changes in metallographic structure, and thermal stress caused by high temperatures, thereby ensuring that the repair layer has high bonding strength, good density, and performance that matches the original chromium plating layer.

[0028] The repair device of this invention integrates online detection, multi-axis coordinated motion and adaptive adjustment of the repair head posture. It can plan the repair path according to the defect information detected in real time and automatically control the repair head to be precisely aligned in the radial, axial and angular directions. It realizes a closed-loop automated operation from identification, cleaning to deposition, reduces the dependence on the operator's experience, and ensures high precision and high consistency of the repair results. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the repair device of the present invention;

[0031] Figure 3 This is a schematic diagram of the composite repair actuator of the present invention;

[0032] Figure 4 This is a schematic diagram of the first supporting structure of the present invention;

[0033] Figure 5 This is a left view of the interior of the loading component of the present invention;

[0034] Figure 6 For the present invention Figure 5 Schematic diagram of the drive component;

[0035] Figure 7 For the present invention Figure 6 A schematic diagram of the structure after the drive components have been removed;

[0036] Figure 8 This is a three-dimensional structural diagram of the connection between the slider, rectangular frame, and sliding sleeve of the present invention;

[0037] Figure 9 This is a flowchart of the online repair method of the present invention.

[0038] In the diagram: Workbench-A, First Support Roller-B, Carrier Roller-C, Second Support Roller-D, Cold Roller-E, Repair Device-F, Protective Cover-G, Support-1, Groove-2, Drive Motor-3, Screw Rod-4, Groove Block-5, Composite Repair Actuator-6, Base Plate-61, First Motor-62, Screw-63, Pad Block-64, First Support Structure-65, Second Support Structure-66, Third Support Structure-67, Internal Threaded Ring-68, Guide Rod-69, First Support Block-691, Second Support Block-692, Carrier Frame-651, Second Motor-652, Lead Screw-653, Shifter Seat-654, Lower Cylinder Column-655, Upper Cylinder Column-656, Positioning Bolt-657, Fixed Positioning frame-658, loading assembly-659, column sleeve-6510, protective cover-6591, sealing strip-6592, through sleeve-6593, protective seat-6594, drive component-6595, displacement component-6596, loading plate-6597, bin cover-65951, third motor-65952, worm gear-65953, worm wheel-65954, cross frame-65961, shaft column rod-65962, rotating rod-65963, slider-65964, rectangular frame-65965, guide block-65966, limit frame-65967, sliding sleeve-65968, push rod-65969, displacement sleeve-659610, arc frame-659611. Detailed Implementation

[0039] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0040] Please see Figure 1 and Figure 2 This invention provides a device for repairing defects in the chromium plating layer of a cold rolling roll, comprising a workbench A, a first support roll B, a carrier roll C, and a second support roll D arranged sequentially from left to right in the upper part of the workbench A, the top ends of the carrier roll C and the second support roll D being located on the same horizontal plane, a cold rolling roll E being arranged directly above the carrier roll C, a protective cover G being wrapped around the top side of the cold rolling roll E, and a repair device F being locked and fixed inside the protective cover G, and the repair device F being located on the side of the cold rolling roll E, so as to roll the metal sheet through the carrier roll C and the cold rolling roll E;

[0041] The repair device F includes a bracket 1, which is fastened to the inside of the cover G by bolts on both sides. Each side of the bracket 1 has a groove 2 facing each other, and a drive motor 3 is locked and fixed within each groove 2. A spiral rod 4 is connected to the left output end of each of the two drive motors 3, and the spiral rod 4 is rotatably connected inside a slot block 5. The opposite sides of the two slot blocks 5 are fixed to the bracket 1. An internal threaded sleeve is threaded onto the outer surface of the spiral rod 4, and the internal threaded sleeve is slidably connected inside the slot block 5. The opposite sides of the two internal threaded sleeves are locked and fixed to a composite repair actuator 6. The composite repair actuator 6 is arranged parallel to the axis of the cold rolling roll E and is used to perform online inspection, laser cleaning, and cold spray deposition repair operations on the surface of the cold rolling roll E. When not performing repair work, the composite repair actuator 6 is moved away from the cold rolling roll E to a safe position. When performing repair work, the drive motors 3 are controlled to engage the spiral rod 4 with the internal threaded sleeve, thereby moving the composite repair actuator 6 closer to the side surface of the cold rolling roll E.

[0042] Please see Figure 2 and Figure 3 This invention provides a device for repairing defects in the chromium plating layer of cold-rolled rolls. The composite repair actuator 6 includes a base plate 61 with two internal threaded sleeves fastened to its two sides respectively. A first motor 62 is locked and fixed to the top left rear side of the base plate 61. A screw 63 is connected to the right output end of the first motor 62. A pad 64 is wrapped around the left side of the outer surface of the screw 63, and the bottom of the pad 64 is locked and fixed to the base plate 61 to support the screw 63. A first support structure 65 and a second support structure are wrapped around the outer surface of the screw 63 from left to right. The first support structure 65, the second support structure 66, and the third support structure 67 are locked together by fasteners to form an integrated module that can move synchronously. An internal threaded ring 68 is embedded and fixed in the front side of the first support structure 65. The inner side of the internal threaded ring 68 is threadedly connected to the screw 63 to form a threaded pair. When the first motor 62 drives the screw 63 to rotate, the internal threaded ring 68 can drive the entire integrated module composed of the three support structures to move precisely along the axis of the screw 63.

[0043] The third support structure 67 is used to install an online scanning laser displacement sensor and a high-resolution CCD camera, forming an online detection module. This module is used to scan the surface of the cold rolling roll E before repair, obtaining three-dimensional contour and two-dimensional morphological images of the defects. The second support structure 66 is used to install a laser cleaning head, which emits pulsed laser light to precisely remove fatigue layers, peeled chromium plating layers, or contaminants at the defects by vaporization or shattering, without damaging the underlying intact cold rolling roll E substrate. The first support structure 65 is used to install a cold spray deposition head, which sprays metal powder at high speed onto the clean and activated substrate area after laser cleaning. The powder particles are deposited in a solid state through intense plastic deformation to form a dense coating. Guide rods 69 slide through the lower front sides of the first support structure 65, the second support structure 66, and the third support structure 67. The guide rods 69 are fixed to the top front side of the base plate 61, providing guidance and anti-torsional support for the movement of the integrated module, ensuring smooth movement.

[0044] Among them, the first support structure 65, the second support structure 66 and the third support structure 67 have the same structure and size. The first support structure 65, the second support structure 66 and the third support structure 67 all have a through hole with a diameter larger than the screw 63 at the same position on the front side. Only the through hole of the first support structure 65 is embedded and fixed with an internal threaded ring 68, and the rest are smooth holes, so that its structure has universality and is easy to process and assemble.

[0045] Furthermore, a first support block 691 is installed on the left front side of the second support structure 66, and a second support block 692 is installed on the left front side of the third support structure 67. Both the first support block 691 and the second support block 692 are wrapped and slidably wrapped around the surface of the guide rod 69, and the bottoms of the first support block 691 and the second support block 692 are in sliding contact with the base plate 61, which further enhances the support stability of the rear part of the integrated module and prevents vibration or sagging caused by excessive cantilever length.

[0046] Please see Figure 3 and Figure 4 The present invention provides a device for repairing defects in the chromium plating layer of cold rolling rolls. The first support structure 65 includes a frame 651 that is wrapped around the outside of the screw 63 and the guide rod 69. A second motor 652 is locked and fixed to the front top of the frame 651. A lead screw 653 is connected to the rear output end of the second motor 652. A displacement seat 654 is connected to the outer surface of the lead screw 653 so that the lead screw 653 rotates under the action of the second motor 652, thereby driving the displacement seat 654 to perform a forward and backward displacement action.

[0047] The lower cylinder column 655 is locked and fixed to the top center of the shifting seat 654. The upper cylinder column 656 is inserted and slidably inserted into the upper center of the lower cylinder column 655. The upper cylinder column 656 is fastened to the inner side of the lower cylinder column 655 by the positioning bolt 657, so as to realize the adjustment of the height position of the upper cylinder column 656. The positioning frame 658 is fixed to the rear side of the upper cylinder column 656. The loading component 659 is locked and fixed to the rear side of the positioning frame 658. The column sleeve 6510 is fixed to the upper center of the front part of the loading component 659.

[0048] The shifting seat 654 has an internal threaded block on its inner side, and the inner side of the internal threaded block is threaded to the lead screw 653. The bottom of the shifting seat 654 is inserted and slids inside the carrier 651 to ensure the straightness of the forward and backward movement. The sleeve 6510 is hollow inside, and the hollow part is connected to the inside of the loading component 659, allowing powder conveying pipes, cooling water pipes, sensor cables, etc. to pass through the hollow part of the sleeve from the rear of the device into the loading component 659. The pipelines are neatly arranged and do not affect the movement.

[0049] Please see Figures 4 to 8 This invention provides a device for repairing defects in the chromium plating layer of cold rolling rolls. The loading assembly 659 includes a protective cover 6591 fixed to the positioning frame 658 at its front center. The rear of the protective cover 6591 has an arc shape adapted to the curvature of the surface of the cold rolling roll E, and a sealing strip 6592 is provided around its periphery, which can form a local protective atmosphere zone close to the roll surface during repair. A through sleeve 6593 is provided inside the upper center of the protective cover 6591, and the through sleeve 6593 corresponds to the position of the column sleeve 6510. For easy pipe passage; a protective seat 6594 is fixedly connected to the front middle side inside the protective cover 6591. A driving component 6595 is installed in the middle left side of the protective seat 6594, and the right side of the driving component 6595 is connected to the displacement component 6596 to drive the rear execution end of the displacement component 6596 to move along a preset arc trajectory. A loading plate 6597 is connected to the arc trajectory execution point of the displacement component 6596, and the repair head (laser head or nozzle) is installed on this loading plate 6597.

[0050] The drive component 6595 includes a housing 65951 fixed to the front side of the protective seat 6594. A third motor 65952 is locked and fixed inside the upper side of the housing 65951. A worm gear 65953 is connected to the rear output end of the third motor 65952. The rear end of the worm gear 65953 is rotatably connected to the housing 65951, and the bottom side of the worm gear 65953 meshes with a worm wheel 65954. The middle side of the worm wheel 65954 is connected to the displacement component 6596. The rotation of the worm wheel 65954 can output a large torque and a precise self-locking angle.

[0051] The displacement component 6596 includes a crossbeam 65961 fixed to the front of the guard seat 6594. A shaft rod 65962 rotatably passes through the inner rear part of the crossbeam 65961. The left end of the shaft rod 65962 is connected to the center of the worm gear 65954, transmitting power to the shaft rod 65962 when the worm gear 65954 rotates. A rotating rod 65963 is connected to the other end of the shaft rod 65962. A slider 65964 is rotatably connected to the end of the rotating rod 65963 away from the shaft rod 65962, and the slider 65964 is slidably connected to a rectangular... Inside frame 65965, when the shaft rod 65962 rotates, it drives the rotating rod 65963 to swing, and the slider 65964 slides within the rectangular frame 65965 through the rotating rod 65963; a guide block 65966 is fixedly connected to the middle right side of the rectangular frame 65965 to form a cross structure. The guide block 65966 is slidably connected to the inside of the limiting frame 65967, and the upper and lower sides of the limiting frame 65967 are fixedly connected to the guard seat 6594, which restricts the rectangular frame 65965 to slide back and forth along the direction of the limiting frame 65967.

[0052] A sliding sleeve 65968 is wrapped around the right rear side of the rectangular frame 65965, and the sliding sleeve 65968 is connected to a push rod 65969. The end of the push rod 65969 away from the sliding sleeve 65968 is rotatably connected to a shifting sleeve 659610. The shifting sleeve 659610 is wrapped around and slids on the outside of the arc frame 659611, and the upper and lower sides of the arc frame 659611 are fixed to the protective seat 6594. The rear side of the shifting sleeve 659610 is locked and fixed to the loading plate 6597. The shifting sleeve 659610 is constrained to slide on the arc frame 659611. The push rod 65969 drives the shifting sleeve 659610 and the loading plate 6597 installed on it to move along the trajectory of the arc frame 659611, thereby realizing the automatic adjustment of the irradiation angle or spray angle of the repair head.

[0053] The displacement sleeve 659610 is arc-shaped and has an arc-shaped hollow slot inside. The shape of the hollow slot matches the shape of the arc frame 659611 to ensure smooth sliding without gaps or wobbling. A protruding post is provided in the middle of the left side of the displacement sleeve 659610, and the protruding post is inserted into and rotates inside the push rod 65969 so that the push rod 65969 can drive the displacement sleeve 659610 to perform displacement action and complete the transmission of motion.

[0054] Specifically, the motion principle of the loading component 659 is as follows: The third motor 65952 drives the worm gear 65953, worm wheel 65954, and shaft rod 65962 to rotate, causing the rotating rod 65963 to oscillate in a circular motion. The slider 65964 at the end of the rotating rod 65963 slides within the rectangular frame 65965, forcing the rectangular frame 65965 to reciprocate along the direction of the limiting frame 65967. The movement of the rectangular frame 65965 is transmitted through the sliding sleeve 65968 and the push rod 6596. 9 is transmitted to the shift sleeve 659610. Since the shift sleeve 659610 is constrained to slide on the arc frame 659611, after the thrust of the push rod 65969 is decomposed, it drives the shift sleeve 659610 together with the loading plate 6597 to move precisely along the trajectory of the arc frame 659611 (i.e. the arc path that fits the surface of the roll), thereby realizing the automatic adjustment of the irradiation angle or spray angle of the repair head, ensuring that it always maintains the best angle with the normal direction of the cold rolling roll E to be repaired.

[0055] Please see Figures 1 to 9 The present invention provides an online repair method for defects in the chromium plating layer of cold-rolled rolls using the aforementioned device. The workflow is as follows:

[0056] First, the metal sheet is placed on the first support roll B, and the metal sheet passes through the inside of the carrier roll C and the cold rolling roll E for cold rolling. After cold rolling, the metal sheet is output and collected after passing over the second support roll D. When the mill is in a planned shutdown or production gap, and it is necessary to repair the chromium plating defects of the cold rolling roll E, the repair device F is started, and the two drive motors 3 are controlled to work to drive the two screw rods 4 to rotate. The two screw rods 4, through the threaded engagement with the two internal threaded sleeves, drive the composite repair actuator 6 to move radially toward the cold rolling roll E, so that it reaches the preset repair work position close to the side surface of the cold rolling roll E.

[0057] Second, drive the cold rolling roll E to rotate around its own axis, and at the same time start the first motor 62 in the composite repair actuator 6. The first motor 62 drives the screw 63 to rotate, and through the transmission of the internal thread ring 68, drives the first support structure 65, the second support structure 66 and the third support structure 67, which are fastened to each other, to move synchronously along the roll axis along the guide rod 69. During this process, the online scanning laser displacement sensor and high-resolution CCD camera on the third support structure 67 are used to scan the surface of the rotating cold rolling roll E, identify and locate the chromium plating defects.

[0058] Third, based on the defect location information identified in step two, control the composite repair actuator 6 to move axially and position the second support structure 66 and the laser cleaning head on it to the front of the defect area; adjust the attitude angle of the laser cleaning head through the loading component 659 on the second support structure 66, and then start the laser cleaning head to emit pulsed laser to precisely clean the defect area and remove contaminants and damaged chromium plating.

[0059] Fourth, control the composite repair actuator 6 to move axially, positioning the first support structure 65 and its cold spray deposition head directly in front of the defect area after cleaning in step three; adjust the spray angle of the cold spray deposition head through the loading component 659 on the first support structure 65, and then start the cold spray deposition head to spray metal powder onto the clean defect substrate surface of the cold rolling roll E to form a dense deposition repair layer.

[0060] Fifth, repeat steps three and four until all identified defects on the current cold rolling roll E have been repaired.

[0061] Sixth, after a single repair task is completed, control the two drive motors 3 to reverse and drive the composite repair actuator 6 to move radially away from the cold rolling roll E and return to the safe position; the repaired cold rolling roll E can be directly put into rolling production.

[0062] Through the above-described apparatus and method, this invention achieves a deep integration of roll repair operations with the rolling production process, transforming traditional long-term offline maintenance into efficient and short-term online maintenance, significantly improving the rolling mill's operating rate and the stability of product surface quality.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for repairing defects in the chromium plating layer of a cold-rolled roll, comprising a workbench (A), wherein a first support roll (B), a carrier roll (C), and a second support roll (D) are arranged sequentially from left to right on the upper part of the workbench (A), the top ends of the carrier roll (C) and the second support roll (D) are located on the same horizontal plane, and a cold-rolled roll (E) is arranged directly above the carrier roll (C), characterized in that, The top side of the cold rolling roll (E) is covered with a protective cover (G), and a repair device (F) is locked and fixed inside the protective cover (G), and the repair device (F) is located on the side of the cold rolling roll (E). The repair device (F) includes a bracket (1), which is fastened to the inside of the cover (G) by bolts on both sides. The bracket (1) has grooves (2) on both sides facing each other, and a drive motor (3) is locked in each of the two grooves (2). The output end of each of the two drive motors (3) is connected to a screw rod (4), and the screw rod (4) is rotatably connected to the inside of the slot block (5). The opposite side of each of the two slot blocks (5) is fixed to the bracket (1). The outer surface of the screw rod (4) is threaded with an internal threaded sleeve, and the internal threaded sleeve is slidably connected to the inside of the slot block (5). The opposite side of each of the two internal threaded sleeves is locked to the composite repair actuator (6). The composite repair actuator (6) is arranged in a direction parallel to the axis of the cold rolling roll (E) and is used to perform online detection, laser cleaning and cold spray deposition repair operations on the surface of the cold rolling roll (E). The composite repair actuator (6) includes a base plate (61) fastened to two internal threaded sliding sleeves on both sides. A first motor (62) is locked and fixed to the top left rear side of the base plate (61). A screw (63) is connected to the output end of the first motor (62) on the right side. A pad (64) is wrapped around the left side of the outer surface of the screw (63), and the bottom of the pad (64) is locked and fixed to the base plate (61). A first support structure (65), a second support structure (66), and a third support structure (67) are wrapped around the outer surface of the screw (63) from left to right. The first support structure (65), the second support structure (66), and the third support structure (67) are wrapped around the outer surface of the screw (63) from left to right. The support structure (66) and the third support structure (67) are fastened together, and an internal threaded ring (68) is embedded and fixed inside the front side of the first support structure (65), the inner side of which is threadedly connected to the screw (63); the third support structure (67) is used to install an online scanning laser displacement sensor and a high-resolution CCD camera for scanning the cold rolling roll (E); the second support structure (66) is used to install a laser cleaning head for emitting pulsed lasers to remove chromium plating or contaminants from defects in the cold rolling roll (E); the first support structure (65) is used to install a cold spray deposition head for spraying cold... Metal powder is sprayed onto the area of ​​the roller (E) after laser cleaning to form a deposition layer; a guide rod (69) slides through the lower front side of the first support structure (65), the second support structure (66), and the third support structure (67), and the guide rod (69) is fixed to the front top of the base plate (61); the first support structure (65) includes a frame (651) wrapped around the outside of the screw (63) and the guide rod (69), a second motor (652) is locked and fixed to the front top of the frame (651), and a lead screw (653) is connected to the output end of the rear side of the second motor (652). A shift seat (654) is connected to the outer surface to drive the shift seat (654) to move back and forth. A lower cylinder column (655) is locked and fixed to the top middle side of the shift seat (654). An upper cylinder column (656) is inserted and slidably inserted into the upper middle side of the lower cylinder column (655), and the upper cylinder column (656) is fastened to the inner side of the lower cylinder column (655) by a positioning bolt (657). A positioning frame (658) is fastened to the rear side of the upper cylinder column (656). A loading assembly (659) is locked and fixed to the rear side of the positioning frame (658). A column sleeve (6510) is fixed to the upper middle side of the front part of the loading assembly (659).

2. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 1, characterized in that, The first support structure (65), the second support structure (66), and the third support structure (67) have the same structure and size. The first support structure (65), the second support structure (66), and the third support structure (67) all have a through-hole with a diameter larger than that of the screw (63) at the same position on the front side. An internal threaded ring (68) is embedded and fixed in the through-hole of the first support structure (65). The second support structure (66) has a first support block (691) installed on the left front side, and the third support structure (67) has a second support block (692) installed on the left front side. The first support block (691) and the second support block (692) are both wrapped and slid on the surface of the guide rod (69), and the bottom of the first support block (691) and the second support block (692) are in sliding contact with the base plate (61).

3. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 1, characterized in that, The shifting seat (654) has an internal threaded block on its inner side, and the inner side of the internal threaded block is threadedly connected to the lead screw (653). The bottom of the shifting seat (654) is inserted and slidably inside the carrier (651). The sleeve (6510) is hollow inside, and the hollow part is connected to the inside of the loading assembly (659).

4. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 1, characterized in that, The loading assembly (659) includes a protective cover (6591) fixed to the positioning frame (658) at the front center. The rear of the protective cover (6591) is arc-shaped and a sealing strip (6592) is provided around its perimeter. A through sleeve (6593) is provided inside the upper center of the protective cover (6591), and the through sleeve (6593) corresponds to the position of the column sleeve (6510). A protective seat (6594) is fixedly connected to the front center of the protective cover (6591). A driving component (6595) is installed on the left center of the protective seat (6594), and the right side of the driving component (6595) is connected to the displacement component (6596) to drive the rear of the displacement component (6596) to move in an arc-shaped trajectory. A loading plate (6597) is connected to the arc-shaped trajectory execution point of the displacement component (6596).

5. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 4, characterized in that, The drive component (6595) includes a housing (65951) fixed to the front side of the guard (6594). A third motor (65952) is locked and fixed inside the upper side of the housing (65951). A worm (65953) is connected to the rear output end of the third motor (65952). The rear end of the worm (65953) is rotatably connected to the housing (65951), and the bottom side of the worm (65953) meshes with a worm wheel (65954). The middle side of the worm wheel (65954) is connected to a displacement component (6596).

6. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 5, characterized in that, The displacement component (6596) includes a crossbeam (65961) fixed to the front of the support (6594). A shaft rod (65962) is rotatably inserted through the inner rear part of the crossbeam (65961). The left end of the shaft rod (65962) is connected to a worm gear (65954), and the other end of the shaft rod (65962) is connected to a rotating rod (65963). A slider (65964) is rotatably connected to the end of the rotating rod (65963) away from the shaft rod (65962), and the slider (65964) is slidably connected inside the rectangular frame (65965). A guide block (65966) is fixedly connected to the middle right side of the rectangular frame (65965) to form a cross structure. The guide block (65966) 5966) is slidably connected inside the limiting frame (65967), and the upper and lower sides of the limiting frame (65967) are fixedly connected to the guard seat (6594). The right rear side of the rectangular frame (65965) is wrapped with a sliding sleeve (65968), and the sliding sleeve (65968) is connected to a push rod (65969). The end of the push rod (65969) away from the sliding sleeve (65968) is rotatably connected to a shift sleeve (659610). The shift sleeve (659610) is wrapped and slidably on the outside of the arc frame (659611), and the upper and lower sides of the arc frame (659611) are fixed to the guard seat (6594). The rear side of the shift sleeve (659610) is locked and fixed to the loading plate (6597).

7. The device for repairing defects in the chromium plating layer of cold rolling rolls according to claim 6, characterized in that, The displacement sleeve (659610) is arc-shaped and has an arc-shaped hollow slot inside. The shape of the hollow slot is adapted to the shape of the arc frame (659611). A protruding post is provided in the middle of the left side of the displacement sleeve (659610), and the protruding post is inserted and rotated inside the push rod (65969).

8. An online repair method for chromium plating defects in cold-rolled rolls, applied to the chromium plating defect repair device for cold-rolled rolls according to any one of claims 1-7, characterized in that, Includes the following steps: S1. When the mill is in a planned shutdown or production gap, the repair device (F) is started, and the screw rod (4) is driven to rotate by two drive motors (3), thereby driving the composite repair actuator (6) to move radially to a preset working position close to the side surface of the cold rolling roll (E); S2. Drive the cold rolling roll (E) to rotate, and at the same time control the composite repair actuator (6) to move along the axial direction of the cold rolling roll (E), and use the online detection module on it to scan the surface of the cold rolling roll (E) to identify and locate defects; S3. Based on the defect location information, control the composite repair actuator (6) to move, position the laser cleaning head to the defect area, adjust its angle and then perform laser cleaning. S4. Control the movement of the composite repair actuator (6), position the cold spray deposition head to the cleaned defect area, adjust its angle and perform cold spray deposition; S5. Repeat steps S3 and S4 to complete the repair of all identified defects; S6. Control the composite repair actuator (6) to return to a safe position radially, and the repaired cold rolling roll (E) can be put into subsequent rolling production.

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