On-line grinding device and grinding method for avoiding vibration marks applied to metallurgical rolls

Abstract

The application discloses an online grinding device and grinding method for avoiding vibration marks of a metallurgical roller, and relates to the technical field of metallurgical rollers. The online grinding device comprises an upper roller and a lower roller arranged at a main frame of a metallurgical rolling mill, and a double-cylinder magnetorheological damper online grinding assembly arranged on one side of the main frame of the metallurgical rolling mill and facing the upper roller or the lower roller, and the lower roller and the upper roller are ground through the online grinding assembly. Compared with a traditional fluid damper, the application has the advantages of smaller volume, higher space utilization and easier installation. The application can provide greater damping force and meet the use requirement of a grinding power head in grinding a high-hardness roller surface. In addition, the application does not dissipate the energy of a driving system in a working condition with slight vibration. Compared with a traditional fluid damper or a rubber damping pad, the application can reduce the vibration acceleration effective value of the grinding power head by 30% to 35%, and effectively remove the vibration marks on the roller surface in the grinding process.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgical manufacturing, and more particularly to an online grinding device and grinding method for preventing vibration marks during online grinding of metallurgical rolls. Background Technology

[0002] Metallurgical rolling mills are important plate production equipment in the steel metallurgical manufacturing industry, and metallurgical rolls are one of the important components of metallurgical rolling mills. The quality of metallurgical rolls directly affects the surface requirements and quality of the finished plate to be rolled, and metallurgical rolls need to be frequently repaired.

[0003] The existing equipment for dressing metallurgical rolls is usually an online grinding system for metallurgical rolls. However, because the power head assembly of this online grinding system has a small mass and low rigidity, it can be used if the surface strength of the metallurgical roll is not high. But when the surface strength of the metallurgical roll is high and hard, the disc grinding wheel and grinding wheel drive device are subjected to a reaction force during the grinding operation, which can easily generate severe vibration. This grinding operation will cause vibration mark defects on the surface of the roll.

[0004] To address the vibration mark defect in metallurgical rolls, existing technology utilizes traditional fluid dampers. While these dampers can achieve vibration reduction for the power head assembly, large fluid dampers require significant installation space, making them unsuitable for placement between two or more power head assemblies. Conversely, smaller fluid dampers generate insufficient damping force, resulting in poor vibration reduction and failing to achieve the desired effect. Another approach involves using installed rubber pads for vibration reduction. However, practical experience by operators has revealed poor performance. This is primarily because the power head assembly requires switching rotational speeds based on the roll's steel and profile, leading to frequent changes in the forced vibration frequency. Rubber pads are only effective in a narrow, low-frequency range, thus failing to meet the requirements for high-frequency applications.

[0005] In summary, there is an urgent need for a new type of device for avoiding vibration marks during online grinding of metallurgical rolls, along with a corresponding implementation method. Summary of the Invention

[0006] To address the severe vibrations caused by the high surface strength and hardness of metallurgical rolls in online grinding systems, and the difficulty in arranging traditional dampers and the poor effectiveness of rubber pads, as well as the problem of numerous vibration marks on the roll surface, this invention proposes an online grinding device and method for avoiding vibration marks on metallurgical rolls. It employs a novel composite double-cylinder magnetorheological damper device for vibration reduction of the grinding power head. This invention satisfies space requirements while providing sufficient damping force and handling high excitation frequencies. Furthermore, to prevent overheating and performance degradation during long-term use, a forced cooling device is included to ensure reliability during extended operation.

[0007] The present invention relates to an online grinding device and grinding method for avoiding vibration marks on metallurgical rolls, the structure and method steps of which are described below:

[0008] An online grinding device for avoiding vibration marks on metallurgical rolls, comprising an upper roll and a lower roll installed on the main frame of a metallurgical rolling mill, characterized in that:

[0009] The metallurgical rolling mill main frame is equipped with a double-cylinder magnetorheological damper online grinding assembly on one side, which is directly opposite the upper or lower roll. The lower and upper rolls are ground by the online grinding assembly.

[0010] According to the present invention, the online grinding device for avoiding vibration marks on metallurgical rolls is characterized in that the online grinding assembly with a dual-cylinder magnetorheological damper includes an online grinding main frame, a frame hydraulic cylinder, an electric push rod, a push rod hydraulic cylinder, a horizontal motion guide rail, a horizontal motion drive device, an axial transmission device, a disc grinding wheel, and a grinding wheel drive motor. The online grinding main frame is vertically arranged on one side of the metallurgical rolling mill main frame. A lifting frame hydraulic cylinder is provided on the side of the frame of the online grinding main frame. An electric push rod is connected to the upper end of the frame hydraulic cylinder, facing the upper or lower roll. The frame hydraulic cylinder controls the lifting and lowering of the electric push rod and positions its height. A push rod is provided at the tail of the electric push rod. The hydraulic cylinder controls the forward or backward movement of the electric push rod towards the roll surface. The head of the electric push rod is equipped with a horizontal motion guide rail coaxial with the roll. A horizontal motion drive device is mounted on the guide rail. One end of the axial transmission device is connected to the horizontal motion drive device, and the other end is connected to the side of the electric push rod. The movement of the axial transmission device moves the horizontal motion drive device along the horizontal motion guide rail, that is, the horizontal motion drive device moves along the roll axis. A disc grinding wheel is mounted at the end of the horizontal motion drive device facing the roll surface. The disc grinding wheel is controlled by a grinding wheel drive motor mounted on the upper part of the horizontal motion drive device. The disc grinding wheel performs grinding operations on the roll surface.

[0011] According to the present invention, the online grinding device for avoiding vibration marks on metallurgical rolls is characterized in that the horizontal motion drive device includes a left slider, a right slider, a left connecting frame, a right connecting frame, a left grinding wheel drive system, a right grinding wheel drive system, an acceleration sensor, a left magnetorheological damper, a right magnetorheological damper, an intermediate fixed frame, and a horizontal motion sliding plate. The left and right sliders are horizontally mounted on a horizontal motion guide rail. The left and right connecting frames are vertically connected to the left side of the left slider and the right side of the right slider, respectively. A left grinding wheel drive system is located at the right angle formed by the left connecting frame and the left slider, and a right grinding wheel drive system is located at the right angle formed by the right connecting frame and the right slider. These two grinding wheel drive systems are respectively connected to their respective disc grinding wheels and grinding wheel drive motors. There are two acceleration sensors, respectively located at... At the junction of the left connecting frame and the left slider, and the right connecting frame and the right slider, two acceleration sensors are connected to the left and right grinding wheel drive systems respectively to measure vibration acceleration. A left magnetorheological damper and a right magnetorheological damper are respectively installed on the upper parts of the left and right connecting frames. These two dampers are arranged in opposite directions. The heads of the dampers are connected to the upper ends of the left and right connecting frames respectively, while the tails of the dampers are connected to the upper part of the vertical intermediate fixed frame between the left and right sliders. The tails of these two dampers are internally interconnected. The lower part of the intermediate fixed frame and the lower parts of the left and right sliders are all connected to a horizontal motion sliding plate located below the horizontal motion guide rail. This horizontal motion sliding plate is connected to and controlled by the axial transmission device to move the entire horizontal motion drive device along the horizontal motion guide rail.

[0012] The purpose of this design is to avoid vibration marks on metallurgical rolls during the grinding process. The principle is as follows:

[0013] When the horizontal motion drive device is moving horizontally, the magnetorheological damping fluid in the tail of the damper moves in the same direction as the horizontal motion drive device, filling the gaps created by the movement inside the damper. At this time, the left and right grinding wheel drive systems are performing grinding operations, and the resulting vibration acceleration is detected by their respective acceleration sensors. Under normal operating conditions, the damping force of the damper is very small and will not affect the movement of the horizontal motion drive device. However, when the detected value exceeds the preset vibration acceleration threshold, current is passed through the left and right magnetorheological dampers to generate a closed magnetic field. This causes the metal particles in the magnetorheological fluid inside the damper to align under the action of the magnetic field, changing from a liquid state to a solid state. This process generates a damping force to attenuate the vibration, thereby suppressing the vibration of the grinding wheel drive system and the disc grinding wheel, and preventing vibration marks on the metallurgical rolls during the grinding process.

[0014] The online grinding device for avoiding vibration marks applied to metallurgical rolls according to the present invention is characterized in that heat dissipation devices are provided on the magnetorheological damping fluid pipelines of both the left and right magnetorheological dampers.

[0015] The purpose of this design is:

[0016] In practical work, it has been found that during long-term use, the temperature of the magnetorheological fluid inside the magnetorheological damper will rise significantly, and the magnetic field generated by the electromagnetic coil is prone to saturation, resulting in a significant decrease in damping force. Natural heat dissipation is insufficient, so a heat dissipation device is installed on the magnetorheological damping fluid pipeline. This heat dissipation device is usually a cooling water pipeline. When the magnetorheological damping fluid passes through the pipeline, the cooling water in the cooling water pipeline flows under the action of the water pump, reducing the temperature of the magnetorheological damping fluid pipeline, thereby ensuring that the magnetorheological damper is in a suitable temperature state.

[0017] An online grinding method for avoiding vibration marks on metallurgical rolls, based on the aforementioned online grinding device for avoiding vibration marks on metallurgical rolls, comprises the following specific steps:

[0018] 1) Before the grinding device is started, the upper and lower rolls of the main frame of the metallurgical rolling mill should be in a stopped and ready-to-roll state;

[0019] 2) Start the upper roller and rotate it to 300-1600 rpm;

[0020] 3) The hydraulic cylinder of the online grinding main frame of the online grinding assembly of the double-cylinder magnetorheological damper is started, raising the electric push rod to the height position of the corresponding upper roll. Then the hydraulic cylinder of the push rod is started, pushing the electric push rod towards the roll surface of the upper roll until the disc grinding wheel connected to the horizontal motion drive device is tangent to the upper roll.

[0021] 4) Start the grinding wheel drive motor to rotate the disc grinding wheel. The acceleration sensor of the horizontal motion drive device begins to collect acceleration signals. At this time, the disc grinding wheel is fed forward by 0 to 0.1 mm under the control of the grinding wheel drive system. The disc grinding wheel that was tangent to the upper roller in step 3) contacts the roller surface of the upper roller and performs grinding operation on it.

[0022] 5) In step 4), the axial transmission device drives the horizontal motion drive device to move along the horizontal motion guide rail. Since the horizontal motion guide rail is coaxial with the roll, the disc grinding wheel connected to the horizontal motion drive device grinds the upper roll while moving axially, and performs grinding operations on various parts of the roll body.

[0023] 6) As the grinding operation proceeds, if the vibration acceleration collected by the accelerometer exceeds the design threshold of 0.2g, current is passed through the left and right magnetorheological dampers. The metal particles in the magnetorheological fluid inside the dampers are oriented under the action of the magnetic field, changing from liquid to solid, generating damping force to attenuate the vibration and avoid vibration marks on the metallurgical roll during the grinding process.

[0024] 7) As the left and right magnetorheological dampers in step 6) are activated, cooling water is introduced into the heat dissipation device installed on the magnetorheological damping fluid pipeline to dissipate heat from the dampers.

[0025] 8) After the grinding of the upper roll is completed, the push rod hydraulic cylinder is activated to retract the electric push rod. The horizontal motion drive device and the disc grinding wheel also retract and disengage from the roll surface of the upper roll. Then the frame hydraulic cylinder is activated to lower the entire double-cylinder magnetorheological damper online grinding assembly to the position of the lower roll. Repeat steps 2) to 7) above to perform grinding operations on the lower roll. The process is the same as that of grinding the upper roll.

[0026] 9) After all the upper and lower rolls have been ground, the online grinding assembly of the double-cylinder magnetorheological damper returns to the starting position to avoid being sprayed by the mill exit cooling system.

[0027] The method for avoiding vibration marks in online grinding of metallurgical rolls according to the present invention is characterized in that, in step 2), the actual rotational speed of the upper roll is determined by the roll diameter.

[0028] The method for avoiding vibration marks in online grinding of metallurgical rolls according to the present invention is characterized in that, in step 3), the distance by which the pusher hydraulic cylinder pushes the electric pusher is 0 to 200 mm.

[0029] The method for avoiding vibration marks in online grinding of metallurgical rolls according to the present invention is characterized in that, in step 5), the axial transmission device drives the horizontal motion drive device to move along the horizontal motion guide rail at a speed of 0.05 to 0.1 meters per second.

[0030] The method for avoiding vibration marks in online grinding of metallurgical rolls according to the present invention is characterized in that, in step 7), the heat dissipation device dissipates heat from the dampers, controlling the operating temperature of the left magnetorheological damper and the right magnetorheological damper to below 75 degrees Celsius.

[0031] The following beneficial effects were obtained by using the online grinding device and grinding method for avoiding vibration marks on metallurgical rolls according to the present invention:

[0032] 1. The online grinding device and grinding method for avoiding vibration marks in metallurgical rolls of the present invention are smaller in size, have higher space utilization, and are easier to install than traditional fluid dampers;

[0033] 2. The online grinding device and grinding method for avoiding vibration marks applied to metallurgical rolls of the present invention can provide greater damping force than traditional dampers, meeting the requirements of grinding power heads for grinding high-hardness roll surfaces;

[0034] 3. The online grinding device and grinding method for avoiding vibration marks applied to metallurgical rolls of the present invention are more energy-efficient and will not dissipate the energy of the drive system under conditions where vibration is not severe;

[0035] 4. Compared with traditional fluid dampers or rubber vibration damping pads, the online grinding device and grinding method for avoiding vibration marks on metallurgical rolls of the present invention can reduce the effective value of vibration acceleration of the grinding power head by 30% to 35%, and can effectively remove vibration marks on the surface of the roll during the grinding process. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the specific structure of the online grinding device and grinding method for avoiding vibration marks in metallurgical rolls according to the present invention.

[0037] Figure 2 This is a schematic diagram of the horizontal motion drive device for the online grinding device and grinding method for avoiding vibration marks in metallurgical rolls according to the present invention.

[0038] Figure 3 This is a schematic diagram of an extended installation form of the online grinding device and grinding method for avoiding vibration marks in metallurgical rolls according to the present invention;

[0039] In the diagram: 1-Metallurgical rolling mill main frame, 2-Upper roll, 3-Lower roll, A-Double-cylinder magnetorheological damper online grinding assembly, A1-Online grinding main frame, A2-Frame hydraulic cylinder, A3-Electric push rod, A4-Push rod hydraulic cylinder, A5-Horizontal motion guide rail, A6-Horizontal motion drive device, A7-Axial transmission device, A8-Disc grinding wheel, A9-Grinding wheel drive motor, A61-Left slider, A62-Right slider, A63-Left connecting frame, A64-Right connecting frame, A65-Left grinding wheel drive system, A66-Right grinding wheel drive system, A67-Acceleration sensor, A68-Left magnetorheological damper, A69-Right magnetorheological damper, A70-Intermediate fixed frame, A71-Horizontal motion sliding plate. Detailed Implementation

[0040] The technical means, creative features, objectives, and effects of the online grinding device and grinding method for avoiding vibration marks in metallurgical rolls of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Example

[0042] like Figure 1and Figure 2 As shown, the online grinding device for avoiding vibration marks applied to metallurgical rolls includes an upper roll 2 and a lower roll 3 installed on the main frame 1 of the metallurgical mill. The main frame of the metallurgical mill has a double-cylinder magnetorheological damper online grinding assembly A on one side, which is directly opposite the upper roll or the lower roll. The lower roll and the upper roll are ground by the online grinding assembly.

[0043] The online grinding assembly A with a dual-cylinder magnetorheological damper includes an online grinding main frame A1, a frame hydraulic cylinder A2, an electric push rod A3, a push rod hydraulic cylinder A4, a horizontal motion guide rail A5, a horizontal motion drive device A6, an axial transmission device A7, a disc grinding wheel A8, and a grinding wheel drive motor A9. The online grinding main frame is vertically arranged on one side of the metallurgical rolling mill main frame 1. A lifting frame hydraulic cylinder is installed on the side of the frame of the online grinding main frame. An electric push rod is connected to the upper end of the frame hydraulic cylinder, facing either the upper roll 2 or the lower roll 3. The frame hydraulic cylinder controls the lifting and lowering of the electric push rod and positions its height. A push rod hydraulic cylinder is installed at the tail of the electric push rod. The hydraulic cylinder controls the electric push rod to move forward or backward along the roll surface. The head of the electric push rod is equipped with a horizontal motion guide rail coaxial with the roll. A horizontal motion drive device is installed on the guide rail. One end of the axial transmission device is connected to the horizontal motion drive device, and the other end is connected to the side of the electric push rod. The movement of the axial transmission device moves the horizontal motion drive device along the horizontal motion guide rail, that is, the horizontal motion drive device moves along the roll axial direction. A disc grinding wheel is installed at the end of the horizontal motion drive device that faces the roll surface. The disc grinding wheel is controlled by a grinding wheel drive motor located on the upper part of the horizontal motion drive device. The disc grinding wheel performs grinding operations on the roll surface.

[0044] The horizontal motion drive device A6 includes a left slider A61, a right slider A62, a left connecting frame A63, a right connecting frame A64, a left grinding wheel drive system A65, a right grinding wheel drive system A66, an acceleration sensor A67, a left magnetorheological damper A68, a right magnetorheological damper A69, an intermediate fixed frame A70, and a horizontal motion sliding plate A71. The left and right sliders are horizontally mounted on the horizontal motion guide rail A5. The left and right connecting frames are vertically connected to the left side of the left slider and the right side of the right slider, respectively. The left grinding wheel drive system is located at the right angle formed by the left connecting frame and the left slider, and the right grinding wheel drive system is located at the right angle formed by the right connecting frame and the right slider. These two grinding wheel drive systems are connected to their respective disc grinding wheels A8 and grinding wheel drive motors A9. There are two acceleration sensors, each with a specific configuration. The two acceleration sensors are located at the junctions of the left connecting frame and the left slider, and the right connecting frame and the right slider, respectively, and are connected to the left and right grinding wheel drive systems to measure their vibration acceleration. A left magnetorheological damper and a right magnetorheological damper are respectively installed on the upper parts of the left and right connecting frames. These two dampers are arranged in opposite directions. The heads of the dampers are connected to the upper ends of the left and right connecting frames, respectively, while the tails of the dampers are connected to the upper part of the vertical intermediate fixed frame between the left and right sliders. The tails of the two dampers are interconnected. The lower part of the intermediate fixed frame and the lower parts of the left and right sliders are all connected to the horizontal motion sliding plate at the bottom of the horizontal motion guide rail. The horizontal motion sliding plate is connected to the axial transmission device A7 and is controlled by it to move the entire horizontal motion drive device along the horizontal motion guide rail.

[0045] Heat dissipation devices are installed on the magnetorheological damping fluid lines of both the left magnetorheological damper A68 and the right magnetorheological damper A69.

[0046] An online grinding method for avoiding vibration marks on metallurgical rolls, based on the aforementioned online grinding device for avoiding vibration marks on metallurgical rolls, comprises the following specific steps:

[0047] 1) Before the grinding device is started, the upper roll 2 and lower roll 3 of the main frame 1 of the metallurgical rolling mill should be in a stopped and waiting state;

[0048] 2) Start the upper roller and rotate it to 300-1600 rpm;

[0049] 3) The frame hydraulic cylinder A2 of the online grinding main frame A1 of the dual-cylinder magnetorheological damper online grinding assembly A is started, raising the electric push rod A3 to the height position corresponding to the upper roll. Then the push rod hydraulic cylinder A4 is started, pushing the electric push rod towards the roll surface of the upper roll until the disc grinding wheel A8 connected to the horizontal motion drive device A6 is tangent to the upper roll.

[0050] 4) Start the grinding wheel drive motor A9 to rotate the disc grinding wheel. The acceleration sensor A67 of the horizontal motion drive device A6 starts to collect acceleration signals. At this time, the disc grinding wheel is fed forward by 0 to 0.1 mm under the control of the grinding wheel drive system. The disc grinding wheel that was tangent to the upper roller in step 3) contacts the roller surface of the upper roller and performs grinding operation on it.

[0051] 5) In step 4), the axial transmission device A7 drives the horizontal motion drive device A6 to move along the horizontal motion guide rail A5. Since the horizontal motion guide rail is coaxial with the roll, the disc grinding wheel A8 connected to the horizontal motion drive device grinds the upper roll while moving axially, and performs grinding operations on various parts of the roll body.

[0052] 6) As the grinding operation proceeds, if the vibration acceleration collected by the accelerometer A67 exceeds the design threshold of 0.2g, current is passed through the left magnetorheological damper A68 and the right magnetorheological damper A69. The metal particles in the magnetorheological fluid inside the damper are oriented under the action of the magnetic field, changing from liquid to solid, generating damping force to attenuate the vibration and avoid vibration marks on the metallurgical roll during the grinding process.

[0053] 7) As the left magnetorheological damper A68 and the right magnetorheological damper A69 in step 6) are activated, cooling water is introduced into the heat dissipation device installed on the magnetorheological damping fluid pipeline to dissipate heat from the dampers.

[0054] 8) After the grinding of the upper roll is completed, the push rod hydraulic cylinder A4 is started to retract the electric push rod A3. The horizontal motion drive device A6 and the disc grinding wheel also retract and disengage from the roll surface of the upper roll. Then the frame hydraulic cylinder A2 is started to lower the entire double-cylinder magnetorheological damper online grinding assembly A to the position of the lower roll 3. Repeat steps 2) to 7) above to perform grinding operations on the lower roll. The process is the same as grinding the upper roll.

[0055] 9) After all the upper and lower rolls have been ground, the online grinding assembly of the double-cylinder magnetorheological damper returns to the starting position to avoid being sprayed by the mill exit cooling system.

[0056] In step 2), the actual rotational speed of the upper roll 2 is determined by the roll diameter.

[0057] In step 3), the distance by which the hydraulic cylinder A4 pushes the electric push rod A3 is 0 to 200 mm.

[0058] In step 5), the axial transmission device A7 drives the horizontal motion drive device A6 to move along the horizontal motion guide rail A5 at a speed of 0.05 to 0.1 meters per second.

[0059] In step 7), the heat dissipation device dissipates heat from the dampers, controlling the operating temperature of the left magnetorheological damper A68 and the right magnetorheological damper A69 to below 75 degrees Celsius.

[0060] like Figure 3 As shown, it should be noted that the online grinding device and grinding method for avoiding vibration marks in metallurgical rolls of the present invention are not limited to two disc grinding wheels and two sets of magnetorheological dampers, but can be an interconnected system of multiple disc grinding wheels and multiple sets of magnetorheological dampers.

[0061] The online grinding device and method for avoiding vibration marks on metallurgical rolls of the present invention are smaller in size, have higher space utilization, and are easier to install than traditional fluid dampers. The online grinding device and method for avoiding vibration marks on metallurgical rolls of the present invention can provide greater damping force than traditional dampers, meeting the requirements of the grinding power head when grinding high-hardness roll surfaces. The online grinding device and method for avoiding vibration marks on metallurgical rolls of the present invention are more energy-efficient, and will not dissipate the energy of the drive system under conditions of mild vibration. Compared with traditional fluid dampers or rubber vibration damping pads, the online grinding device and method for avoiding vibration marks on metallurgical rolls of the present invention can reduce the effective value of the vibration acceleration of the grinding power head by 30% to 35%, effectively removing vibration marks from the roll surface during the grinding process.

[0062] However, those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any changes or modifications to the above embodiments within the spirit and essence of this application will fall within the scope of the claims of this application.

Claims

1. An online grinding device for avoiding vibration marks on metallurgical rolls, comprising an upper roll (2) and a lower roll (3) disposed on the main frame (1) of a metallurgical rolling mill, characterized in that: The metallurgical rolling mill main frame (1) is provided with a double-cylinder magnetorheological damper online grinding assembly (A) on one side, which is directly opposite the upper roll (2) or the lower roll (3). The lower roll and the upper roll are ground by the online grinding assembly. The online grinding assembly (A) of the dual-cylinder magnetorheological damper includes an online grinding main frame (A1), a frame hydraulic cylinder (A2), an electric push rod (A3), a push rod hydraulic cylinder (A4), a horizontal motion guide rail (A5), a horizontal motion drive device (A6), an axial transmission device (A7), a disc grinding wheel (A8), and a grinding wheel drive motor (A9). The online grinding main frame is arranged vertically on one side of the metallurgical rolling mill main frame (1). A lifting frame hydraulic cylinder is provided on the side of the frame of the online grinding main frame. An electric push rod is connected to the upper end of the frame hydraulic cylinder and faces the upper roll (2) or the lower roll (3). The frame hydraulic cylinder controls the lifting and lowering of the electric push rod and positions its height. A push rod hydraulic cylinder is provided at the tail end of the electric push rod, which controls the forward or backward movement of the electric push rod towards the roll surface. The head of the electric push rod is provided with a horizontal motion guide rail coaxial with the roll. A horizontal motion drive device is provided on the guide rail. One end of the axial transmission device is connected to the horizontal motion drive device, and the other end is connected to the side of the electric push rod. The movement of the axial transmission device moves the horizontal motion drive device along the horizontal motion guide rail, that is, the horizontal motion drive device moves along the roll axis. A disc grinding wheel is provided at the end of the horizontal motion drive device that faces the roll surface. The disc grinding wheel is controlled by a grinding wheel drive motor located on the upper part of the horizontal motion drive device. The disc grinding wheel performs grinding operations on the roll surface. The horizontal motion drive device (A6) includes a left slider (A61), a right slider (A62), a left connecting frame (A63), a right connecting frame (A64), a left grinding wheel drive system (A65), a right grinding wheel drive system (A66), an acceleration sensor (A67), a left magnetorheological damper (A68), a right magnetorheological damper (A69), a middle fixed frame (A70), and a horizontal motion sliding plate (A71). The left and right sliders are horizontally mounted on the horizontal motion guide rail (A5). The left and right connecting frames are vertically connected to the left side of the left slider and the right side of the right slider, respectively. A left grinding wheel drive system is located at the right angle formed by the left connecting frame and the left slider, and a right grinding wheel drive system is located at the right angle formed by the right connecting frame and the right slider. These two grinding wheel drive systems are connected to their respective disc grinding wheels (A8) and grinding wheel drive motors (A9). Two acceleration sensors are located at the junctions of the left connecting frame and the left slider, and the right connecting frame and the right slider, respectively. These two acceleration sensors are connected to the left and right grinding wheel drive systems and measure their vibration acceleration. The upper parts of the connecting frame and the right connecting frame are respectively equipped with a left magnetorheological damper and a right magnetorheological damper. These two dampers are arranged in opposite directions. The heads of the dampers are connected to the upper ends of the left connecting frame and the right connecting frame, respectively, while the tails of the dampers are connected to the upper part of the vertical intermediate fixed frame between the left slider and the right slider. The tails of these two dampers are interconnected. The lower part of the intermediate fixed frame and the lower parts of the left slider and the right slider are connected to the horizontal motion sliding plate located at the lower part of the horizontal motion guide rail. The horizontal motion sliding plate is connected to the axial transmission device (A7) and is controlled by it to move the entire horizontal motion drive device along the horizontal motion guide rail.

2. The online grinding device for avoiding vibration marks applied to metallurgical rolls as described in claim 1, characterized in that, The left magnetorheological damper (A68) and the right magnetorheological damper (A69) are both equipped with heat dissipation devices on their magnetorheological damping fluid lines.

3. An online grinding method for avoiding vibration marks on metallurgical rolls, based on any one of claims 1 to 2, comprising the following specific steps: 1) Before the grinding device is started, the upper roll (2) and lower roll (3) of the main frame (1) of the metallurgical rolling mill should be in a stopped and waiting state; 2) Start the upper roller and rotate it to 300-1600 rpm; 3) The frame hydraulic cylinder (A2) of the online grinding main frame (A1) of the dual-cylinder magnetorheological damper online grinding assembly (A) is started, raising the electric push rod (A3) to the height position corresponding to the upper roll. Then the push rod hydraulic cylinder (A4) is started, pushing the electric push rod towards the roll surface of the upper roll until the disc grinding wheel (A8) connected to the horizontal motion drive device (A6) is tangent to the upper roll. 4) Start the grinding wheel drive motor (A9) to rotate the disc grinding wheel. The acceleration sensor (A67) of the horizontal motion drive device (A6) begins to collect acceleration signals. At this time, the disc grinding wheel is fed forward by 0 to 0.1 mm under the control of the grinding wheel drive system. The disc grinding wheel, which was already tangent to the upper roller in step 3), contacts the roller surface of the upper roller and performs grinding operation on it. 5) In step 4), the axial transmission device (A7) drives the horizontal motion drive device (A6) to move along the horizontal motion guide rail (A5). Since the horizontal motion guide rail is coaxial with the roll, the disc grinding wheel (A8) connected to the horizontal motion drive device grinds the upper roll while moving axially, and performs grinding operations on various parts of the roll body. 6) As the grinding operation proceeds, if the vibration acceleration collected by the accelerometer (A67) exceeds the design threshold of 0.2g, current is passed through the left magnetorheological damper (A68) and the right magnetorheological damper (A69). The metal particles in the magnetorheological fluid inside the damper are oriented under the action of the magnetic field, changing from liquid to solid, generating damping force to attenuate the vibration and avoid vibration marks on the metallurgical roll during the grinding process. 7) As the left magnetorheological damper (A68) and the right magnetorheological damper (A69) in step 6) are activated, cooling water is introduced into the heat dissipation device installed on the magnetorheological damping fluid pipeline to dissipate heat from the dampers. 8) After the grinding of the upper roll is completed, the push rod hydraulic cylinder (A4) is activated to retract the electric push rod (A3) backward. The horizontal motion drive device (A6) and the disc grinding wheel also retract and disengage from the roll surface of the upper roll. Then the frame hydraulic cylinder (A2) is activated to lower the entire double-cylinder magnetorheological damper online grinding assembly (A) to the lower roll position. Repeat steps 2) to 7) above to perform grinding operations on the lower roll. The process is the same as that of grinding the upper roll. 9) After all the upper and lower rolls have been ground, the online grinding assembly of the double-cylinder magnetorheological damper returns to the starting position to avoid being sprayed by the mill exit cooling system.

4. The online grinding method for avoiding vibration marks applied to metallurgical rolls as described in claim 3, characterized in that, In step 2), the actual rotational speed of the upper roll (2) is determined by the roll diameter.

5. The online grinding method for avoiding vibration marks applied to metallurgical rolls as described in claim 3, characterized in that, In step 3), the distance by which the push rod hydraulic cylinder (A4) pushes the electric push rod (A3) is 0 to 200 mm.

6. The online grinding method for avoiding vibration marks applied to metallurgical rolls as described in claim 3, characterized in that, In step 5), the axial transmission device (A7) drives the horizontal motion drive device (A6) to move along the horizontal motion guide rail (A5) at a speed of 0.05 to 0.1 meters per second.

7. The online grinding method for avoiding vibration marks applied to metallurgical rolls as described in claim 3, characterized in that, In step 7), the heat dissipation device dissipates heat from the dampers, controlling the operating temperature of the left magnetorheological damper (A68) and the right magnetorheological damper (A69) to below 75 degrees Celsius.

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