A method of sealing an annealing furnace pre-feed roll

Abstract

The application discloses a sealing method for a pre-feeding roller of an annealing furnace, and is applied to the feeding port sealing of a continuous annealing furnace for stainless steel strips. The method comprises the following steps: detecting the contact pressure between the sealing roller and the optical axis by a first pressure sensor, detecting the contact pressure between the optical axis and the sealing plate by a second pressure sensor, detecting the rotational speed difference of the two ends of the optical axis by first and second rotational speed sensors; a controller performs wear state evaluation according to the detection signals; when the contact pressure is lower than a threshold value, a gas cylinder is controlled to drive the sealing roller to move to compensate for the wear; when the rotational speed difference exceeds a threshold value, it is determined that taper wear occurs, and differential control instructions are sent to the two ends of the sealing roller to adjust the inclination angle to compensate for uneven pressure distribution; and a sealing failure early warning is sent when the contact pressure between the optical axis and the sealing plate is lower than a warning threshold value. The application realizes real-time sensing of the wear state of the sealing roller, active compensation of the taper wear and early warning of the sealing failure, and improves the sealing reliability and the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of continuous annealing technology for stainless steel strips, and more specifically to a sealing method for the feed rollers in front of an annealing furnace. Background Technology

[0002] Currently, the furnace mouth seal of continuous annealing furnaces generally adopts a pressure roller sealing structure, which consists of two upper and lower rubber sealing rollers and a wool felt sealing plate that contacts the surface of the sealing rollers. A gap is left between the two sealing rollers to facilitate the passage of the steel strip. When the steel strip passes through the gap between the sealing rollers, it comes into close contact with the sealing rollers. The sealing rollers and the wool felt plate work together to achieve furnace mouth sealing.

[0003] However, the aforementioned existing technologies still have the following long-overlooked technical problems in practical applications: First, the sealing roller will experience uneven wear during long-term operation, especially conical wear (i.e., inconsistent wear at both ends of the sealing roller). Existing adjustment mechanisms typically only allow for the overall vertical lifting and lowering of the sealing roller, failing to independently adjust its tilt. When conical wear occurs, the contact pressure between the sealing roller and the steel strip becomes unevenly distributed axially, leading to a locally larger sealing gap. This causes furnace atmosphere to leak from the larger gap, drastically reducing the overall sealing effect. Current technology lacks real-time monitoring of the speed difference between the two ends of the sealing roller, and cannot automatically adjust the feed rate at both ends of the sealing roller based on the speed difference to achieve tilt compensation.

[0004] Secondly, in existing technologies, the contact pressure between the sealing roller and the sealing plate cannot be sensed in real time. Wear compensation relies on the physical deformation of passive components such as springs, resulting in low compensation accuracy and lag in response. When the pressure of the protective atmosphere inside the furnace fluctuates, the pressure control with a fixed threshold cannot adapt to changes in operating conditions, easily leading to insufficient sealing or excessive compression.

[0005] Third, existing technologies cannot quantitatively assess the cumulative wear status and lifespan prediction of sealing rollers. Operators have difficulty predicting the remaining service life of sealing rollers and often can only replace them after seal failure occurs, affecting production continuity and product yield.

[0006] Fourth, existing technologies lack early warning mechanisms for the degradation of sealing performance at the sealing contact interface. When the contact pressure drops to the critical value for sealing failure, an early warning signal cannot be issued in time, leading to an accident of atmosphere leakage inside the furnace.

[0007] To address the aforementioned technical problems, this invention proposes a sealing method for the feed roller in front of an annealing furnace to at least partially solve these problems. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, this invention provides a sealing method for the feed roller in front of an annealing furnace.

[0009] The objective of this invention can be achieved through the following technical solutions: A sealing method for the front feed roller of an annealing furnace is applied to the furnace feed inlet of an annealing furnace having two sets of sealing mechanisms arranged symmetrically. Each set of sealing mechanisms consists of a rubber sealing roller, a steel optical shaft, and a wool felt sealing plate that are sequentially bonded together. The rubber sealing roller is connected to a cylinder drive mechanism for driving its overall movement, and each end of the roller is connected to an independent drive mechanism for independent driving. The method is characterized by including the following steps: Step S1: The contact pressure between the sealing roller and the optical shaft is detected in real time by a first pressure sensor installed between the rubber sealing roller and the steel optical shaft; the contact pressure between the optical shaft and the sealing plate is detected in real time by a second pressure sensor installed between the steel optical shaft and the felt sealing plate; the speed difference between the two ends of the steel optical shaft relative to the rubber sealing roller is detected by a first speed sensor and a second speed sensor installed at both ends of the steel optical shaft. Step S2: The detection signals from the first pressure sensor, the second pressure sensor, the first speed sensor, and the second speed sensor are transmitted to the controller in real time. The controller performs wear condition assessment based on the detection signals. Step S3: When the controller determines that the detection value of the first pressure sensor is lower than the first preset threshold, the controller sends a first control command to the cylinder drive mechanism, which drives the rubber sealing roller to move towards the steel optical axis through the cylinder, increasing the contact pressure between the sealing roller and the optical axis until the detection value of the first pressure sensor returns to the range of the first preset threshold. Step S4: When the controller determines that the speed difference between the first speed sensor and the second speed sensor exceeds the second preset threshold, the controller determines that the sealing roller has conical wear. According to the direction and magnitude of the speed difference, the controller sends differentiated control commands to the independent drive mechanisms located at both ends of the sealing roller, so that the moving distances at both ends of the sealing roller are different, and the tilt angle of the sealing roller is adjusted to compensate for the uneven distribution of sealing pressure caused by conical wear. Step S5: When the controller determines that the detection value of the second pressure sensor is lower than the third preset threshold, the controller sends a seal failure warning signal to the alarm device.

[0010] Preferably, in step S3, the first preset threshold is the minimum sealing contact pressure value when the sealing roller is working normally. This threshold is dynamically adjusted according to the pressure value of the protective atmosphere in the furnace. When the pressure in the furnace increases, the controller automatically increases the first preset threshold.

[0011] Preferably, the dynamic adjustment of the first preset threshold is performed according to the following formula:

[0012] in, The adjusted first preset threshold, The initial first preset threshold, The current furnace pressure, The reference furnace pressure, This is the preset pressure compensation coefficient.

[0013] Preferably, the differentiated control command in step S4 includes: issuing a command to increase the feed amount to the end of the sealing roller with greater wear, and issuing a command to decrease the feed amount or keep it stationary to the end of the sealing roller with less wear, so that the sealing roller is slightly tilted in a plane perpendicular to the running direction of the steel strip, in order to compensate for the uneven pressure distribution caused by the conical wear of the sealing roller surface.

[0014] Preferably, in step S1, the first speed sensor and the second speed sensor are photoelectric encoders or magnetoelectric speed sensors, and the first pressure sensor and the second pressure sensor are thin-film pressure sensors, which are attached to the surface of the sealing roller or the surface of the optical shaft.

[0015] Preferably, the method further includes a step for predicting the cumulative wear life of the sealing roller: the controller records the compensation amount and compensation time of each wear compensation action, establishes a wear rate model for the sealing roller, predicts the remaining service life of the sealing roller based on the wear rate model, and issues a replacement prompt signal when the remaining service life is lower than a fourth preset threshold.

[0016] Preferably, the wear rate model is established using the following formula:

[0017] in, The average wear rate of the sealing roller. Let be the compensation displacement for the i-th compensation action. The time interval between the i-th compensation action and the (i-1)-th compensation action; the remaining service life of the sealing roller. Calculate using the following formula:

[0018] in, This represents the maximum permissible wear of the sealing roller. This represents the current cumulative wear and tear.

[0019] Preferably, the tilt angle adjustment of the sealing roller in step S4 is positively correlated with the speed difference, and the second preset threshold is 2% to 10% of the rated speed of the sealing roller.

[0020] Preferably, the third preset threshold in step S5 is 50% to 80% of the contact pressure value measured by the second pressure sensor during the initial installation and commissioning of the equipment, and the controller will issue a seal failure warning signal only when the detection value of the second pressure sensor is lower than the third preset threshold at least three times in a row.

[0021] Preferably, the controller performs a wear status assessment every preset time period, and takes the statistical average value of the sensor detection values ​​within the assessment period as the basis for judgment.

[0022] The beneficial effects of this invention are as follows: By using a first pressure sensor positioned between the rubber sealing roller and the steel optical shaft, a second pressure sensor positioned between the steel optical shaft and the felt sealing plate, and first and second speed sensors positioned at both ends of the steel optical shaft, real-time detection of the contact pressure between the sealing roller and the optical shaft, the contact pressure between the optical shaft and the sealing plate, and the speed difference between the two ends of the optical shaft is achieved. The controller performs wear condition assessment based on the detection signals. When the contact pressure is lower than a first preset threshold, the cylinder is actively driven to compensate for wear. When the speed difference exceeds a second preset threshold, conical wear is determined and a differentiated control command is issued to adjust the tilt angle of the sealing roller to compensate for uneven pressure distribution. When the value detected by the second pressure sensor is lower than a third preset threshold, a seal failure warning is issued. This achieves real-time perception of the wear state of the sealing roller, active compensation for conical wear, adaptive adjustment of sealing pressure, and prediction and warning of remaining lifespan. It effectively solves the technical problems of non-compensation for conical wear, non-real-time perception of pressure, non-predictability of lifespan, and lack of warning of failure in the prior art. It significantly improves the reliability of the furnace mouth seal of the annealing furnace and the service life of the equipment, and reduces the risk of furnace atmosphere leakage and production interruption losses caused by seal failure. Attached Figure Description

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic flowchart of the sealing method for the front feed roller of the annealing furnace according to the present invention.

[0025] Figure 2 This is a schematic diagram of the overall structure of the sealing device for the front feed roller of the annealing furnace according to the present invention.

[0026] Figure 3 This is another overall structural schematic diagram of the sealing device for the front feed roller of the annealing furnace of the present invention.

[0027] Figure 4 This is a schematic diagram of the sealing mechanism of the sealing device for the front feed roller of the annealing furnace of the present invention.

[0028] In the diagram: 100, furnace inlet; 200, steel optical shaft; 300, rubber sealing roller; 400, wool felt sealing plate; 500, cylinder drive mechanism; 600, drive mechanism. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0030] Example 1 This invention provides a sealing method for the front feed roller of an annealing furnace, applicable to the sealing of the furnace inlet of a continuous annealing furnace for stainless steel strips. Please refer to... Figures 1 to 4 The sealing device used in this embodiment includes a frame with a furnace inlet 100. Two sets of sealing mechanisms are symmetrically arranged vertically at the furnace inlet 100. Each sealing mechanism consists of a rubber sealing roller 300, a steel optical shaft 200, and a wool felt sealing plate 400, which are sequentially bonded together to form a three-layer composite sealing path. Specifically, the steel optical shaft 200 is positioned between the rubber sealing roller 300 and the wool felt sealing plate 400. The roller surface of the rubber sealing roller 300 is in contact with the outer circumferential surface of the steel optical shaft 200, and the outer circumferential surface of the steel optical shaft 200 is in contact with the inner wall of an arc-shaped groove on the wool felt sealing plate 400.

[0031] The sealing method of this embodiment includes the following steps S1 to S5.

[0032] Step S1: Real-time detection using multiple sensors. A first pressure sensor is installed between the rubber sealing roller 300 and the steel optical shaft 200 to detect the contact pressure between the sealing roller and the optical shaft in real time. A second pressure sensor is installed between the steel optical shaft 200 and the felt sealing plate 400 to detect the contact pressure between the optical shaft and the sealing plate in real time. A first speed sensor and a second speed sensor are installed at both ends of the steel optical shaft 200 to detect the speed difference between the two ends of the steel optical shaft 200 relative to the rubber sealing roller 300. The first and second speed sensors can be photoelectric encoders or magnetoelectric speed sensors. The first and second pressure sensors can be thin-film pressure sensors attached to the surface of the sealing roller or the optical shaft. The sensors collect data in real time, providing a basis for subsequent wear condition assessment.

[0033] Step S2: Signal Transmission and Wear Condition Assessment. The detection signals from the first pressure sensor, the second pressure sensor, the first speed sensor, and the second speed sensor are transmitted to the controller in real time. Upon receiving these signals, the controller performs a wear condition assessment based on the detection signals. The controller internally stores a first preset threshold, a second preset threshold, and a third preset threshold. The controller performs a wear condition assessment every preset time period and uses the statistical average of the sensor detection values ​​within the assessment period as the judgment basis to avoid misjudgments caused by instantaneous fluctuations.

[0034] Step S3: Contact Pressure Compensation Control. The controller determines whether the detection value of the first pressure sensor is lower than a first preset threshold. The first preset threshold is the minimum sealing contact pressure value when the sealing roller is working normally. When the detection value of the first pressure sensor is lower than the first preset threshold, it indicates that the contact pressure between the rubber sealing roller 300 and the steel optical shaft 200 is insufficient, and the sealing effect decreases. At this time, the controller sends a first control command to the cylinder drive mechanism 500. After receiving the command, the cylinder drive mechanism 500 drives the rubber sealing roller 300 to move towards the steel optical shaft 200 through the cylinder, thereby increasing the contact pressure between the sealing roller and the optical shaft. The controller continuously monitors the detection value of the first pressure sensor until the detection value returns to the range of the first preset threshold, and then stops the compensation action. Through this closed-loop control, active compensation for the wear of the sealing roller is achieved, with high compensation accuracy and timely response.

[0035] To accommodate the impact of furnace protective atmosphere pressure fluctuations on sealing requirements, the first preset threshold can be dynamically adjusted based on the furnace protective atmosphere pressure. Specifically, when the furnace pressure increases, the controller automatically raises the first preset threshold to maintain sufficient sealing pressure. The dynamic adjustment is performed according to the following formula: .in, The adjusted first preset threshold, The initial first preset threshold, The current furnace pressure, The reference furnace pressure, This is the preset pressure compensation coefficient. This formula achieves a linear linkage between the threshold and the furnace pressure, making the sealing control more precise.

[0036] Step S4: Conical Wear Identification and Tilt Compensation Control. The controller determines whether the speed difference between the first and second speed sensors exceeds a second preset threshold. The second preset threshold is 2% to 10% of the rated speed of the sealing roller. When the speed difference exceeds the second preset threshold, it indicates that the speeds at both ends of the steel optical shaft 200 are inconsistent. Based on this, the controller determines that the rubber sealing roller 300 has experienced conical wear, meaning that the wear at both ends of the sealing roller is different. At this time, the controller issues differentiated control commands to the independent drive mechanisms 600 located at both ends of the sealing roller according to the direction and magnitude of the speed difference. The differentiated control commands include: issuing a command to increase the feed amount to the end of the sealing roller with greater wear, and issuing a command to decrease the feed amount or keep it stationary to the end of the sealing roller with less wear. These commands cause the moving distances at both ends of the sealing roller to be different, thereby adjusting the sealing roller to produce a slight tilt in the plane perpendicular to the running direction of the steel strip to compensate for the uneven distribution of sealing pressure caused by conical wear. The adjustment amount of the tilt angle of the sealing roller is positively correlated with the speed difference; that is, the larger the speed difference, the larger the tilt angle needs to be adjusted. In this way, even if the sealing roller experiences tapered wear, the sealing pressure can be maintained evenly distributed along the axial direction, preventing localized leakage.

[0037] Step S5: Seal Failure Warning. The controller determines whether the detection value of the second pressure sensor is lower than a third preset threshold. The third preset threshold is 50% to 80% of the contact pressure value measured by the second pressure sensor during the initial installation and commissioning of the equipment. When the detection value of the second pressure sensor is lower than the third preset threshold, it indicates that the contact pressure between the steel optical shaft 200 and the felt sealing plate 400 is severely insufficient, and the sealing performance is about to fail. At this time, the controller sends a seal failure warning signal to the alarm device. To avoid false alarms caused by instantaneous fluctuations in the sensor, the controller only issues a seal failure warning signal when the detection value of the second pressure sensor is lower than the third preset threshold at least three times consecutively. The warning signal can be manifested as an audible and visual alarm or a prompt on the remote monitoring interface, reminding operators to check or replace relevant components in a timely manner.

[0038] It should be noted that during the rotation of the rubber sealing roller 300, sliding friction will occur between its end face and the side wall of the frame. Long-term operation will lead to end face wear, which will affect the axial positioning accuracy of the sealing roller. To solve this problem, an annular plate can be installed between the end face of the rubber sealing roller 300 and the side wall of the frame. This annular plate is made of self-lubricating wear-resistant material and is used to connect the sealing roller and the frame to avoid direct friction between the two.

[0039] Self-lubricating wear-resistant materials can be broadly classified into two categories: metal-based composite materials and engineering plastic composite materials. Metal-based self-lubricating composite materials are primarily copper-based or iron-based powder metallurgy materials, manufactured by adding solid lubricants such as graphite, molybdenum disulfide, and tungsten sulfide to a metal matrix. For example, in steel-backed copper-based bimetallic materials, a copper alloy layer is sintered onto the surface of a steel matrix, with graphite encapsulated within the copper alloy powder. As the surface copper alloy layer wears down, the graphite is gradually exposed on the friction surface, providing continuous self-lubrication and friction reduction. Copper-based graphite-containing materials are widely used in the manufacture of sliding bearings, sealing rings, and guide rails, offering advantages such as low friction coefficient, good wear resistance, and high load-bearing capacity. Iron-based graphite-containing materials exhibit even higher wear resistance and load-bearing capacity, making them suitable for heavy-load applications.

[0040] Engineering plastic self-lubricating wear-resistant materials include high-performance polymers such as polyetheretherketone (PEEK), polyimide, polytetrafluoroethylene (PTFE), and ultra-high molecular weight polyethylene (UHMWPE). PEEK-based self-lubricating composites, modified with fillers such as PTFE, graphite, and carbon fiber, exhibit extremely low friction coefficients and excellent wear resistance, making them suitable for dynamic seals and friction applications involving corrosive media. Polyimide-based self-lubricating composites, made by adding fillers such as carbon fiber and colloidal graphite to modified polyimide resin, can operate continuously below 250°C, possessing excellent properties such as high strength, wear resistance, low friction coefficient, and corrosion resistance, making them suitable for high-temperature sealing rings and self-lubricating bearings. PTFE-filled composites, by adding fillers such as graphite, graphene, carbon black, tin bronze powder, or molybdenum disulfide, significantly improve the poor wear resistance of pure PTFE, and are widely used in various sealing and lubrication applications. Ultra-high molecular weight polyethylene has an extremely low coefficient of friction and extremely high wear resistance. Its mortar abrasion index is only one-fifth that of nylon 66 and one-seventh that of carbon steel. Combined with its self-lubricating properties, it can significantly reduce frictional resistance.

[0041] By selecting the above-mentioned suitable self-lubricating wear-resistant materials, the frictional resistance of the sealing roller end face can be effectively reduced, the end face wear rate can be slowed down, thereby extending the working life of the sealing roller and maintaining the axial relative position accuracy between the sealing roller and the optical shaft.

[0042] It should be noted that the cylinder drive mechanism 500 is used to achieve overall feeding of the sealing roller to compensate for contact pressure attenuation, while the independent drive mechanism 600 is used to achieve differentiated feeding at both ends of the sealing roller to compensate for conical wear. When both compensation requirements exist simultaneously, the controller prioritizes contact pressure compensation. After the detection value of the first pressure sensor recovers to the range of the first preset threshold, tilt angle compensation is then performed to avoid mutual interference between the compensation actions.

[0043] Example 2 This embodiment, based on Embodiment 1, further includes a step for predicting the cumulative wear life of the sealing roller. The parts identical to those in Embodiment 1 will not be repeated; only the distinguishing features will be described.

[0044] The controller records the compensation amount and compensation time for each wear compensation action. The compensation amount is the distance the cylinder drives the sealing roller to move in step S3, and the compensation displacement for each compensation action is recorded as follows: The compensation time is the time interval between two consecutive compensation actions. The time interval between the i-th compensation action and the (i-1)-th compensation action is denoted as... The controller establishes a wear rate model for the sealing roller based on this historical data. The wear rate model is established using the following formula: .in, The average wear rate of the sealing roller is given by the numerator, which is the sum of all compensated displacements, and the denominator is the sum of all time intervals.

[0045] The controller then predicts the remaining service life of the sealing roller based on a wear rate model. (Remaining service life of the sealing roller) Calculate using the following formula: .in, This represents the maximum permissible wear of the sealing roller. This represents the current cumulative wear (i.e., the sum of all compensated displacements). When the predicted remaining service life falls below the fourth preset threshold, the controller issues a replacement warning signal, notifying operators to prepare spare parts and arrange a maintenance plan in advance, thereby avoiding sudden shutdowns caused by excessive wear of the sealing roller.

[0046] Example 3 This embodiment further optimizes the sensor selection and arrangement in the above embodiments. The first and second speed sensors are photoelectric encoders, respectively installed at both ends of the steel optical shaft 200, coaxially arranged with it. The photoelectric encoder can accurately measure the rotation angle and speed of the optical shaft. The first and second pressure sensors are thin-film pressure sensors. The first pressure sensor is attached to the contact area between the roller surface of the rubber sealing roller 300 and the steel optical shaft 200, and the second pressure sensor is attached between the roller surface of the steel optical shaft 200 and the inner wall of the arc-shaped groove of the felt sealing plate 400. Thin-film pressure sensors have the advantages of small thickness, fast response, and no impact on the contact surface adhesion. The sampling frequency of all sensors is uniformly set by the controller: the sampling frequency of the first pressure sensor is 100Hz to 1000Hz, the sampling frequency of the second pressure sensor is 50Hz to 500Hz, and the sampling frequency of the first and second speed sensors is 200Hz to 2000Hz. The controller performs a wear condition assessment every 0.5 to 2 seconds. Within each assessment cycle, the controller takes the arithmetic mean of the values ​​detected by each sensor as the basis for judgment to eliminate noise interference.

[0047] Example 4 This embodiment describes the specific control methods of the cylinder drive mechanism 500 and the independent drive mechanism 600 in the above embodiments. The cylinder drive mechanism 500 includes a cylinder, an electromagnetic reversing valve, and a displacement sensor. After the controller issues a first control command, the electromagnetic reversing valve switches the air path, and the cylinder piston rod extends to push the rubber sealing roller 300 towards the steel optical axis 200. The displacement sensor detects the moving distance in real time, and when the displacement reaches the required compensation amount, the controller issues a stop command. The independent drive mechanism 600 includes two independent servo electric cylinders, respectively installed at both ends of the sealing roller. The controller calculates the required feed amount at both ends based on the direction and magnitude of the speed difference, and then sends position commands to the two servo electric cylinders, causing the two ends of the sealing roller to move different distances, thereby achieving precise adjustment of the tilt angle. Through closed-loop control of the servo electric cylinders, the tilt angle adjustment accuracy can reach 0.01 degrees.

[0048] Example 5 This embodiment further explains the alarm device and early warning logic in the above embodiments. The alarm device includes a buzzer and indicator light mounted on the operation panel, as well as a communication module connected to the remote monitoring system. When the controller determines that the detection value of the second pressure sensor is lower than a third preset threshold, it first performs three consecutive checks for confirmation. If all three consecutive checks are below the threshold, it is determined to be a real failure risk, and the controller issues a seal failure early warning signal. The buzzer emits intermittent alarm sounds, and the indicator light flashes yellow. At the same time, the communication module sends early warning information to the remote monitoring system, including the failure location, current pressure value, and early warning threshold. After receiving the early warning, the operator can promptly check and maintain the sealing components to prevent furnace atmosphere leakage accidents.

[0049] In summary, the sealing method for the front feed roller of the annealing furnace provided by this invention, through multi-sensor fusion detection, intelligent judgment by the controller, and precise action of the actuator, achieves real-time perception of the wear state of the sealing roller, active compensation for conical wear, adaptive adjustment of sealing pressure, and prediction and early warning of remaining life. This significantly improves the reliability of the furnace mouth seal and the service life of the equipment, and reduces the risk of furnace atmosphere leakage and production interruption losses caused by seal failure.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sealing method for a front feed roller of an annealing furnace, applied to the furnace feed inlet of an annealing furnace having two sets of sealing mechanisms arranged symmetrically in the upper and lower parts, each set of sealing mechanisms consisting of a rubber sealing roller, a steel optical shaft, and a wool felt sealing plate that are sequentially bonded together, wherein the rubber sealing roller is connected to a cylinder drive mechanism for driving its overall movement, and each end of the roller is connected to an independent drive mechanism for independent driving, characterized in that, Includes the following steps: Step S1: The contact pressure between the sealing roller and the optical shaft is detected in real time by a first pressure sensor installed between the rubber sealing roller and the steel optical shaft; the contact pressure between the optical shaft and the sealing plate is detected in real time by a second pressure sensor installed between the steel optical shaft and the felt sealing plate; the speed difference between the two ends of the steel optical shaft relative to the rubber sealing roller is detected by a first speed sensor and a second speed sensor installed at both ends of the steel optical shaft. Step S2: The detection signals from the first pressure sensor, the second pressure sensor, the first speed sensor, and the second speed sensor are transmitted to the controller in real time. The controller performs wear condition assessment based on the detection signals. Step S3: When the controller determines that the detection value of the first pressure sensor is lower than the first preset threshold, the controller sends a first control command to the cylinder drive mechanism, which drives the rubber sealing roller to move towards the steel optical axis through the cylinder, increasing the contact pressure between the sealing roller and the optical axis until the detection value of the first pressure sensor returns to the range of the first preset threshold. Step S4: When the controller determines that the speed difference between the first speed sensor and the second speed sensor exceeds the second preset threshold, the controller determines that the sealing roller has conical wear. According to the direction and magnitude of the speed difference, the controller sends differentiated control commands to the independent drive mechanisms located at both ends of the sealing roller, so that the moving distances at both ends of the sealing roller are different, and the tilt angle of the sealing roller is adjusted to compensate for the uneven distribution of sealing pressure caused by conical wear. Step S5: When the controller determines that the detection value of the second pressure sensor is lower than the third preset threshold, the controller sends a seal failure warning signal to the alarm device.

2. The sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, In step S3, the first preset threshold is the minimum sealing contact pressure value when the sealing roller is working normally. This threshold is dynamically adjusted according to the pressure value of the protective atmosphere in the furnace. When the pressure in the furnace increases, the controller automatically increases the first preset threshold.

3. The sealing method for the front feed roller of an annealing furnace according to claim 2, characterized in that, The dynamic adjustment of the first preset threshold is performed according to the following formula: in, The adjusted first preset threshold, The initial first preset threshold, The current furnace pressure, The reference furnace pressure, This is the preset pressure compensation coefficient.

4. The sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, The differentiated control commands in step S4 include: issuing a command to increase the feed amount to the end of the sealing roller with greater wear, and issuing a command to decrease the feed amount or keep it stationary to the end of the sealing roller with less wear, so that the sealing roller is slightly tilted in a plane perpendicular to the running direction of the steel strip, in order to compensate for the uneven pressure distribution caused by the conical wear of the sealing roller surface.

5. The sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, In step S1, the first speed sensor and the second speed sensor are photoelectric encoders or magnetoelectric speed sensors, and the first pressure sensor and the second pressure sensor are thin-film pressure sensors, which are attached to the surface of the sealing roller or the surface of the optical shaft.

6. The sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, It also includes a step for predicting the cumulative wear life of the sealing roller: the controller records the compensation amount and compensation time of each wear compensation action, establishes a wear rate model for the sealing roller, predicts the remaining service life of the sealing roller based on the wear rate model, and issues a replacement prompt signal when the remaining service life is lower than a fourth preset threshold.

7. A sealing method for the front feed roller of an annealing furnace according to claim 6, characterized in that, The wear rate model is established using the following formula: in, The average wear rate of the sealing roller. Let be the compensation displacement for the i-th compensation action. The time interval between the i-th compensation action and the (i-1)-th compensation action; the remaining service life of the sealing roller. Calculate using the following formula: in, This represents the maximum permissible wear of the sealing roller. This represents the current cumulative wear and tear.

8. The sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, The tilt angle adjustment of the sealing roller in step S4 is positively correlated with the speed difference, and the second preset threshold is 2% to 10% of the rated speed of the sealing roller.

9. A sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, The third preset threshold mentioned in step S5 is 50% to 80% of the contact pressure value measured by the second pressure sensor during the initial installation and commissioning of the equipment. The controller will issue a seal failure warning signal only when the detection value of the second pressure sensor is lower than the third preset threshold at least three times in a row.

10. A sealing method for the front feed roller of an annealing furnace according to claim 1, characterized in that, The controller performs a wear status assessment every preset time period and takes the statistical average value of the sensor detection values ​​within the assessment period as the basis for judgment.

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