A hot-rolling work roll surface oxide film peeling online repairing device and method

Abstract

The application provides an online repairing device and method for oxide film peeling of a hot-rolling work roll, which comprises a heating and rolling assembly, a transverse driving assembly, a switching and bearing assembly, a cooling treatment assembly, an image acquisition assembly and a heating and film-forming assembly. The online repairing device adopts an industrial camera to monitor the surface quality of the rolling roll body online, compares a pre-labeled defect photo, determines the position of the oxide film defect in real time, repairs the oxide film peeling position of the rolling roll body surface by using a film-forming heater, and finally realizes uniform distribution of the oxide film on the rolling roll body surface. The online repairing device can repair the oxide film peeling damage of the hot-rolling work roll, reduce the grinding frequency of the rolling roll after rolling, reduce the rolling roll loss, improve the production efficiency, can monitor the surface quality of the rolling roll online, reduce the on-site inspection workload of the rolling roll maintenance personnel, and reduce the personnel configuration.

Description

Technical Field

[0001] This invention relates to metallurgical equipment, and more particularly to an online repair device and method for oxide film peeling off the surface of hot rolling work rolls. Background Technology

[0002] After a period of rolling, hot rolling mills commonly experience surface fatigue and frictional wear, leading to localized oxide film detachment and the formation of micro-cracks. These surface defects ultimately affect the surface quality of the steel strip, increasing the frequency of roll changes and grinding, reducing rolling load, and raising production costs. CN212238624U discloses a hot-rolled thin plate work roll cooling system that reduces the roll temperature, especially the roll surface temperature in the rolling deformation zone, by spraying cooling onto the hot-rolled work rolls. This reduces oxide film detachment and extends roll life. CN110280605A discloses a method for reducing the oxide film peeling rate of rolling mill rolls. The method controls the temperature fluctuation range of the rolled material along its entire length to be ≤10℃, and controls the target temperature difference between the rolling materials in the same batch to be <20℃, the time difference in the furnace to be <10min, the temperature difference between RT2 temperature and final rolling temperature to be <150℃ during rough rolling, the inlet temperature to be <1050℃ during finish rolling, and the temperature difference between the edge and middle of the roll to be <20℃ during cooling and after leaving the mill, and the temperature of the highest point of the roll after leaving the mill to be ≤60℃. Summary of the Invention

[0003] The purpose of this invention is to provide an online repair device and method for oxide film peeling off the surface of hot-rolled work rolls.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows:

[0005] An online repair device for oxide film peeling off the surface of hot-rolled work rolls includes:

[0006] A heated rolling assembly is installed in the equipment frame and is connected to a drive mechanism. The drive mechanism drives the heated rolling assembly to rotate in the equipment frame to perform rolling operations on the strip.

[0007] A transverse drive assembly is mounted in the equipment frame and corresponds to the position of the heated rolling assembly, and can operate in the equipment frame;

[0008] The transfer bearing assembly is installed in the equipment frame through a movable connection structure. It corresponds to the position of the heating and rolling assembly and cooperates with the transverse drive assembly. The transverse drive assembly drives the transfer bearing assembly to move, thereby adjusting the positional relationship between the transfer bearing assembly and the heating and rolling assembly.

[0009] A cooling treatment assembly is installed in the transfer bearing assembly and can move together with the transfer bearing assembly. It corresponds to the position of the heating and rolling assembly and can perform cooling treatment on the heating and rolling assembly.

[0010] An image acquisition component is installed in the transfer carrier component and can move with the transfer carrier component. It corresponds to the position of the heating and rolling component and can acquire images of the surface of the heating and rolling component to determine the location of oxide film peeling.

[0011] A heating film-forming component is installed in a transfer carrier component and can move together with the transfer carrier component. It corresponds to the position of the heating rolling component and cooperates with the image acquisition component. The heating film-forming component can heat the heating rolling component and form an oxide film based on the oxide film peeling image.

[0012] Specifically, the heated rolling assembly includes:

[0013] The rolling rolls are provided in pairs. Each rolling roll is installed in the equipment frame through a rotating shaft and connected to the drive mechanism. A roll gap adapted to the shape of the strip is formed between the rolling rolls. The rolling rolls are rotated by the drive mechanism to perform rolling operation on the strip.

[0014] The lateral movement drive components include:

[0015] The drive screw is mounted in the equipment frame via bearings and can rotate within the equipment frame. It is located outside the rolling roll body and is parallel to the rolling roll body.

[0016] The drive motor is installed in the equipment frame, and its power output shaft is connected to the drive screw, which is driven by the drive motor to rotate.

[0017] The adapter bearer components include:

[0018] The support box is mounted in the equipment frame via a slide rail parallel to the drive screw, and is engaged with the drive screw via a transmission nut. The drive motor can rotate in both directions, causing the drive screw to drive the support box to move back and forth.

[0019] The cooling components include:

[0020] A cold water inlet pipe is installed on the carrier box and can move with the carrier box. It is connected to the cold water cavity set inside the carrier box and to the cold water supply equipment. The cold water supply equipment can supply cold water to the cold water cavity through the cold water inlet pipe.

[0021] A cold water nozzle is installed on the support box and can move with the support box. It is connected to the cold water cavity and points to the outer wall of the rolling roll body. Cooling water is sprayed onto the outer wall of the rolling roll body by the cold water nozzle.

[0022] The image acquisition components include:

[0023] An industrial camera, mounted on a carrier housing, can move with the carrier housing and is pointed at the outer wall of the rolling roll. The industrial camera acquires images of the outer wall of the rolling roll to determine the location of oxide film peeling.

[0024] The heated film-forming assembly includes:

[0025] A film-forming heater is installed on the carrier box and can move with the carrier box. It points to the outer wall of the rolling roll body. According to the position of oxide film peeling determined by the industrial camera, the film-forming heater heats the outer wall of the rolling roll body to repair the position of oxide film peeling.

[0026] An online repair method for oxide film peeling off the surface of hot-rolled work rolls, using the aforementioned repair device, includes:

[0027] After the strip rolling is completed, adjust the speed of the rolling rolls to 10-30 revolutions per minute and adjust the pressure of the cold water nozzles to below 0.2 MPa;

[0028] Start the drive motor to drive the drive screw to rotate, causing the carrier box to move, which in turn moves the cold water nozzle, industrial camera and film-forming heater to the repair position of the rolling roll;

[0029] The distance between the industrial camera and the outer wall of the rolling roll is set to 15cm to 25cm. Its static detection range is a square area no larger than 10mm×20mm. It can identify oxide film peeling surfaces smaller than 4mm×4mm. It is connected to the computer through a signal line. As the industrial camera moves with the carrier box, the detected images are stitched together in the computer to form an overall surface image of the rolling roll.

[0030] Based on the location of oxide film peeling determined by the industrial camera, the outer wall of the rolling roll is heated by the film-forming heater to repair the peeling location of the oxide film.

[0031] The industrial camera and film-forming heater are mounted on the support box via a deflection shaft, and a deflection motor or pneumatic motor is set to drive its deflection. The deflection angle is 10° to 45°, which allows the industrial camera to get closer to the surface of the rolling roll, keeping its focal length fixed and avoiding interference with the rolling roll.

[0032] The heating range of the film-forming heater is no greater than 2mm×2mm. During the heating process, the moving speed of the drive screw is 50% of the detection speed of the industrial camera.

[0033] The advantages of this invention are:

[0034] This online repair device uses an industrial camera to monitor the surface quality of the rolling rolls online. By comparing the device with pre-calibrated defect photos, the location of oxide film defects is determined in real time. A film-forming heater is then used to repair the peeling oxide film on the surface of the rolling rolls, ultimately achieving a uniform distribution of the oxide film on the surface of the rolling rolls. This device can repair oxide film peeling damage on hot rolling work rolls online, reduce the number of times the rolls need to be ground off the mill, reduce roll wear, improve production efficiency, and monitor the surface quality of the rolls online, reducing the workload of on-site inspections by roll maintenance personnel and reducing staffing requirements. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the end face structure of the online repair device for oxide film peeling off the surface of hot rolling work rolls proposed in this invention;

[0036] Figure 2 This is a side view of the online repair device;

[0037] Figure 3 This is a schematic diagram showing the adjustment status of an industrial camera and a film-forming heater. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] like Figures 1-3As shown, the online repair device for oxide film peeling on the surface of hot-rolled work rolls proposed in this invention includes a heating and rolling assembly, a transverse drive assembly, a transfer bearing assembly, a cooling assembly, an image acquisition assembly, and a heating and film-forming assembly. The heating and rolling assembly is installed in the equipment frame and is connected to the drive mechanism. The drive mechanism drives the heating and rolling assembly to rotate in the equipment frame to perform rolling operations on the strip. The transverse drive assembly is installed in the equipment frame and corresponds to the position of the heating and rolling assembly. It can rotate in the equipment frame. The transfer bearing assembly is installed in the equipment frame through a movable connection structure, corresponds to the position of the heating and rolling assembly, and cooperates with the transverse drive assembly. The transverse drive assembly drives the transfer bearing assembly to move, thus repairing the oxide film peeling on the surface of the hot-rolled work roll. The positional relationship between the component and the heating and rolling assembly is adjusted. The cooling assembly is installed in the transfer bearing assembly and can move with the transfer bearing assembly. It corresponds to the position of the heating and rolling assembly and can perform cooling treatment on the heating and rolling assembly. The image acquisition assembly is installed in the transfer bearing assembly and can move with the transfer bearing assembly. It corresponds to the position of the heating and rolling assembly and can acquire images of the surface of the heating and rolling assembly to determine the oxide film peeling location. The heating film forming assembly is installed in the transfer bearing assembly and can move with the transfer bearing assembly. It corresponds to the position of the heating and rolling assembly and cooperates with the image acquisition assembly. The heating film forming assembly can heat the heating and rolling assembly and form an oxide film based on the oxide film peeling image.

[0040] In this embodiment, the heating and rolling assembly includes rolling rolls 1a and 1b. Each rolling roll is installed in the equipment frame via a rotating shaft and connected to the drive mechanism. A roll gap adapted to the shape of the strip is formed between the rolling rolls. The rolling rolls are rotated by the drive mechanism to perform rolling operation on the strip, so that the steel plate 2 to be processed is squeezed to form a steel strip 8.

[0041] The transverse drive assembly includes a drive screw 210 and a drive motor 220. The drive screw is mounted in the equipment frame via bearings and can rotate in the equipment frame. It is located outside the rolling roll body and is parallel to the rolling roll body. The drive motor is mounted in the equipment frame, and its power output shaft is connected to the drive screw, which drives the drive screw to rotate.

[0042] The transfer bearing assembly includes bearing housings 6a and 6b. The bearing housing is installed in the equipment frame via a slide rail parallel to the drive screw and is engaged with the drive screw via a transmission nut. The drive motor can rotate in both directions, causing the drive screw to drive the bearing housing to move back and forth.

[0043] The cooling system includes cold water inlet pipes 5a and 5b and cold water nozzles 7a and 7b. The cold water inlet pipes are installed on the support housing and can move with the support housing. They are connected to the cold water chamber located inside the support housing and to the cold water supply equipment. The cold water supply equipment can supply cold water to the cold water chamber through the cold water inlet pipes. The cold water nozzles are installed on the support housing and can move with the support housing. They are connected to the cold water chamber and point towards the outer wall of the rolling roll body. Cooling water is sprayed onto the outer wall of the rolling roll body by the cold water nozzles.

[0044] The image acquisition component includes industrial cameras 4a and 4b. The industrial cameras are mounted on the carrier housing and can move with the carrier housing. They are pointed at the outer wall of the rolling roll body. The industrial cameras acquire images of the outer wall of the rolling roll body to determine the location of oxide film peeling.

[0045] The heating film-forming assembly includes film-forming heaters 3a and 3b. The film-forming heaters are installed on the carrier box and can move with the carrier box. They point towards the outer wall of the rolling roll body. According to the oxide film peeling position determined by the industrial camera, the film-forming heaters heat the outer wall of the rolling roll body to repair the oxide film peeling position.

[0046] The film-forming heater is a non-contact heater, which can be a laser heater or an electromagnetic induction heater. A laser heater uses a laser as a heat source to irradiate the surface of the rolling roll, and in conjunction with cooling water, regenerates an oxide film on the rolling roll surface in the oxide film peeling area. An electromagnetic induction heater utilizes the skin effect of high-frequency induced current to generate high temperatures in the defective area of ​​the work roll, which, in conjunction with cooling water, produces a new oxide film. Due to the larger size of the electromagnetic induction heater, a laser heater is selected in this embodiment.

[0047] An online repair method for oxide film peeling off the surface of hot-rolled work rolls, using the aforementioned repair device, includes:

[0048] After the strip rolling is completed, adjust the speed of the rolling rolls to 10-30 revolutions per minute and adjust the pressure of the cold water nozzles to below 0.2 MPa;

[0049] Start the drive motor to drive the drive screw to move, causing the carrier box to move, which in turn moves the cold water nozzle, industrial camera and film-forming heater to the repair position of the rolling roll;

[0050] The distance between the industrial camera and the outer wall of the rolling roll is set to 15cm to 25cm. Its static detection range is a square area no larger than 10mm×20mm. It can identify oxide film peeling surfaces smaller than 4mm×4mm. It is connected to the computer through a signal line. As the industrial camera moves with the carrier box, the detected images are stitched together in the computer to form an overall surface image of the rolling roll.

[0051] Based on the location of oxide film peeling determined by the industrial camera, the outer wall of the rolling roll is heated by the film-forming heater to repair the peeling location of the oxide film.

[0052] The industrial camera and film-forming heater are mounted on the support box via a deflection shaft, and a deflection motor 610 or a pneumatic motor is provided to drive their deflection. The deflection angle is 10° to 45°. In this embodiment, the rolling roll body is divided into a support roll and a working roll. The diameter of the support roll ranges from 600 to 1500 mm, and the diameter of the working roll ranges from 400 to 900 mm. When the support roll and working roll with the smallest diameter are combined, or when the working roll and support roll with the largest diameter are combined, the industrial camera is far from or close to the surface of the support roll. At this time, the deflection motor or pneumatic motor can be used to drive the industrial camera to deflect, so that the industrial camera can get closer to the surface of the rolling roll body, keep its focal length fixed, and avoid interference with the rolling roll body.

[0053] The heating range of the film-forming heater is no greater than 2mm×2mm. During the heating process, the moving speed of the drive screw is 50% of the detection speed of the industrial camera.

[0054] In the description of this invention, it should be noted that when terms such as "upper," "lower," "inner," "outer," "left," and "right" appear to indicate orientation or positional relationships, they should be understood as being based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this invention is in use, or the orientation or positional relationships commonly understood by those skilled in the art. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, when terms such as "first" and "second" appear, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that unless otherwise explicitly specified and limited, terms such as "installation," "setting," and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. An online repair device for oxide film peeling off the surface of hot-rolled work rolls, characterized in that, include: A heated rolling assembly is installed in the equipment frame and is connected to a drive mechanism. The drive mechanism drives the heated rolling assembly to rotate in the equipment frame to perform rolling operations on the strip. A transverse drive assembly is mounted in the equipment frame and corresponds to the position of the heated rolling assembly, and can operate in the equipment frame; The transfer bearing assembly is installed in the equipment frame through a movable connection structure. It corresponds to the position of the heating and rolling assembly and cooperates with the transverse drive assembly. The transverse drive assembly drives the transfer bearing assembly to move, thereby adjusting the positional relationship between the transfer bearing assembly and the heating and rolling assembly. A cooling treatment assembly is installed in the transfer bearing assembly and can move together with the transfer bearing assembly. It corresponds to the position of the heating and rolling assembly and can perform cooling treatment on the heating and rolling assembly. An image acquisition component is installed in the transfer carrier component and can move with the transfer carrier component. It corresponds to the position of the heating and rolling component and can acquire images of the surface of the heating and rolling component to determine the location of oxide film peeling. A heating film-forming component is installed in a transfer carrier component and can move together with the transfer carrier component. It corresponds to the position of the heating rolling component and cooperates with the image acquisition component. The heating film-forming component can heat the heating rolling component and form an oxide film based on the oxide film peeling image.

2. The online repair device for oxide film peeling off the surface of hot-rolled work rolls according to claim 1, characterized in that, The heated rolling assembly includes: The rolling rolls are provided in pairs. Each rolling roll is installed in the equipment frame through a rotating shaft and connected to the drive mechanism. A roll gap adapted to the shape of the strip is formed between the rolling rolls. The rolling rolls are rotated by the drive mechanism to perform rolling operation on the strip.

3. The online repair device for oxide film peeling off the surface of hot-rolled work rolls according to claim 2, characterized in that, The lateral movement drive components include: The drive screw is mounted in the equipment frame via bearings and can rotate within the equipment frame. It is located outside the rolling roll body and is parallel to the rolling roll body. The drive motor is installed in the equipment frame, and its power output shaft is connected to the drive screw, which is driven by the drive motor to rotate.

4. The online repair device for oxide film peeling off the surface of hot-rolled work rolls according to claim 2, characterized in that, The adapter bearer assembly includes: The support box is mounted in the equipment frame via a slide rail parallel to the drive screw, and is engaged with the drive screw via a transmission nut. The drive motor can rotate in both directions, causing the drive screw to drive the support box to move back and forth.

5. The online repair device for oxide film peeling off the surface of hot-rolled work rolls according to claim 4, characterized in that, The cooling components include: A cold water inlet pipe is installed on the carrier box and can move with the carrier box. It is connected to the cold water cavity set inside the carrier box and to the cold water supply equipment. The cold water supply equipment can supply cold water to the cold water cavity through the cold water inlet pipe. A cold water nozzle is installed on the support box and can move with the support box. It is connected to the cold water cavity and points to the outer wall of the rolling roll body. Cooling water is sprayed onto the outer wall of the rolling roll body by the cold water nozzle.

6. The online repair device for oxide film peeling off the surface of a hot-rolled work roll according to claim 4, characterized in that, The image acquisition components include: An industrial camera, mounted on a carrier housing, can move with the carrier housing and is pointed at the outer wall of the rolling roll. The industrial camera acquires images of the outer wall of the rolling roll to determine the location of oxide film peeling.

7. The online repair device for oxide film peeling off the surface of a hot-rolled work roll according to claim 6, characterized in that, The heated film-forming assembly includes: A film-forming heater is installed on the carrier box and can move with the carrier box. It points to the outer wall of the rolling roll body. According to the position of oxide film peeling determined by the industrial camera, the film-forming heater heats the outer wall of the rolling roll body to repair the position of oxide film peeling.

8. A method for online repair of oxide film peeling on the surface of hot-rolled work rolls, comprising using the repair device described in any one of claims 1 to 7, characterized in that, include: After the strip rolling is completed, adjust the speed of the rolling rolls to 10-30 revolutions per minute and adjust the pressure of the cold water nozzles to below 0.2 MPa; Start the drive motor to drive the drive screw, which moves the carrier box and moves the cold water nozzle, industrial camera and film-forming heater to the repair position of the rolling roll. The distance between the industrial camera and the outer wall of the rolling roll is set to 15cm to 25cm. Its static detection range is a square area no larger than 10mm×20mm. It can identify oxide film peeling surfaces smaller than 4mm×4mm. It is connected to the computer through a signal line. As the industrial camera moves with the carrier box, the detected images are stitched together in the computer to form an overall surface image of the rolling roll. Based on the location of oxide film peeling determined by the industrial camera, the outer wall of the rolling roll is heated by the film-forming heater to repair the peeling location of the oxide film.

9. The method for online repair of oxide film peeling on the surface of hot-rolled work rolls according to claim 8, characterized in that: The industrial camera and film-forming heater are mounted on the support box via a deflection shaft, and a deflection motor or pneumatic motor is set to drive its deflection. The deflection angle is 10° to 45°, which allows the industrial camera to get closer to the surface of the rolling roll, keeping its focal length fixed and avoiding interference with the rolling roll.

10. The method for online repair of oxide film peeling on the surface of hot-rolled work rolls according to claim 8, characterized in that: The heating range of the film-forming heater is no greater than 2mm×2mm. During the heating process, the moving speed of the drive screw is 50% of the detection speed of the industrial camera.

Images