A method for blocking the scale of hot rolling roughing mill work roll

Abstract

The application provides a hot-rolling roughing mill work roll slag blocking method for blocking iron oxide scale splashing, and relates to the technical field of hot-rolling machinery. The method is realized based on a slag blocking system, and the system comprises upper and lower work roll mechanisms and corresponding upper and lower slag blocking plates. The two slag blocking plates are arranged in a staggered manner along the roll axis, and the upper slag blocking plate is arranged outside the lower slag blocking plate at intervals. The method starts rolling and obtains initial state data of the work roll. In the rolling process, the iron oxide scale splashing is discharged by the lower slag blocking plate in the first blocking and the upper slag blocking plate in the second intercepting of the hierarchical structure, and the rolling is finally ended after the deviation exceeding the threshold value is eliminated by comparing the current state data of the work roll with the initial data. The application can effectively block the iron oxide scale splashing to the transmission side, is suitable for multiple working conditions without structural interference, and improves the operation safety and protection stability of the roughing mill unit.

Description

Technical Field

[0001] This invention relates to the field of hot rolling mill equipment technology, and in particular to a method for preventing slag splashing on the work rolls of a hot rolling roughing mill. Background Technology

[0002] In the hot rolling roughing process, the work rolls directly contact the high-temperature steel billet and complete the plastic deformation process. During high-pressure water descaling and rolling, a large amount of high-temperature iron oxide scale is generated and splashes in all directions. According to the relevant safety regulations for steel rolling, the descaling device of the rolling mill must be equipped with a protective structure to prevent the hazards of iron oxide scale splashing. Existing technology has achieved the blocking of iron oxide scale in areas such as the gap between the mill stand and the edge of the rolls through structures such as slag baffles and water blocking devices at the roll edge, which can reduce the intrusion of iron oxide scale into the equipment gaps to a certain extent.

[0003] However, existing protection schemes do not form a dedicated protection system for the drive side of the roughing mill. The drive side area is equipped with a large number of hydraulic oil pipes and electrical cables. Under high-pressure descaling conditions, unobstructed iron oxide scale splashing into this area can easily ignite the pipelines, causing fire accidents and posing serious personal and equipment safety hazards. At the same time, the existing slag-blocking structures are mostly fixed layouts, which are difficult to adapt to the working roll axial misalignment and dynamic changes in roll gap during roll changing and rolling. They cannot meet the dual requirements of no structural interference during roll changing and continuous protection during the rolling process. Furthermore, they lack dynamic monitoring and deviation correction mechanisms for the slag-blocking operation status. After long-term operation, the protective effectiveness is easily weakened due to positional deviation, which restricts the safety level and operating efficiency of roughing mill production.

[0004] Therefore, it is necessary to propose a method for preventing iron oxide scale from splashing onto the work rolls of a hot rolling roughing mill to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main objective of this invention is to provide a method for blocking slag on the work rolls of a hot rolling roughing mill to prevent iron oxide scale from splashing, thereby solving the problem that existing slag-blocking structures cannot simultaneously provide protection and correction in the case of accidents easily caused by iron oxide scale splashing.

[0006] To achieve the above objectives, the present invention provides a method for blocking slag from the work rolls of a hot rolling roughing mill. The method is based on a slag-blocking system, which includes an upper work roll mechanism and a lower work roll mechanism. The upper work roll mechanism is connected to the top of the lower work roll mechanism. An upper slag-blocking plate extending downward is connected to the bottom of one end of the upper work roll mechanism, and a lower slag-blocking plate extending upward is connected to the top of one end of the lower work roll mechanism. The upper slag-blocking plate and the lower slag-blocking plate are offset along the roll axis, and the upper slag-blocking plate is spaced apart from the outer side of the lower slag-blocking plate. The method includes the following steps: S1, Initiate the work roll rolling state and acquire the initial state data of the work roll; S2, During the rolling process, splashed iron oxide scale is generated. The lower slag baffle plate provides initial physical obstruction of the splashed iron oxide scale, which then flows out along both sides of the upper and lower work roll mechanisms with the mill cooling water. S3, the upper slag baffle plate provides secondary physical obstruction for residual iron oxide scale that crosses the lower slag baffle plate, and the residual iron oxide scale flows out from the gap between the upper slag baffle plate and the lower slag baffle plate with the mill cooling water; and the residual iron oxide scale splashed at the edges flows out to the two side edges of the upper slag baffle plate and the lower slag baffle plate with the mill cooling water. S4. Acquire the current state data of the work roll at preset time intervals and compare it with the initial state data of the work roll. If the difference exceeds the preset threshold range, start the deviation elimination command. S5, end the work roll rolling state.

[0007] Preferably, step S4 specifically includes the following steps: S41, by means of displacement sensors installed on the upper working roll mechanism and the lower working roll mechanism, the current status data of the working roll is collected in real time at preset intervals; wherein, the current status data of the working roll includes the actual axial gap and the actual vertical gap between the upper baffle plate and the lower baffle plate; S42, calculate the difference between the actual axial clearance and the actual vertical clearance and the initial state data of the work roll; wherein, the initial state data of the work roll includes the initial axial clearance and the initial vertical clearance between the upper slag baffle and the lower slag baffle, so as to obtain the axial clearance deviation value and the vertical clearance deviation value, and determine whether the axial clearance deviation value and the vertical clearance deviation value exceed the preset allowable tolerance range.

[0008] Preferably, step S42 is followed by the step: S43, if the axial clearance deviation value or the vertical clearance deviation value exceeds the allowable tolerance range, generate a deviation elimination command containing the deviation position coordinates and the deviation magnitude; S44, according to the deviation elimination command, the adaptive universal nozzles set on the edges of the upper slag baffle and the lower slag baffle are linked and controlled to dynamically adjust the spray angle of the adaptive universal nozzles, so as to accurately concentrate the cooling water spray focus at the position with the largest gap deviation value to form a spray water curtain and maintain the preset spray time, so as to remove the adhering iron oxide scale and prevent the iron oxide scale from blocking the gap between the upper slag baffle and the lower slag baffle. S45, if the axial clearance deviation value or the vertical clearance deviation value is within the allowable tolerance range, the deviation elimination command is not executed, and the process returns to step S41.

[0009] Preferably, step S44 further includes the step of: S441, after executing the deviation elimination command, it is determined again whether the axial clearance deviation value or the vertical clearance deviation value meets the requirements; S442, if yes, then return to step S41; S443, if not, then the adaptive universal nozzle will be activated again for secondary cleaning; S444: If the requirement is still not met after the second clearing, a warning signal will be issued.

[0010] Preferably, the upper working roll mechanism includes an upper working roll body and two upper bearing seats spaced apart along the roll axis. The upper working roll body is rotatably connected between the two upper bearing seats. An upper slag baffle plate is formed by the outward protrusion of the bottom outer side of one of the upper bearing seats. The upper slag baffle plate is L-shaped. The lower working roll mechanism includes a lower working roll body and two lower bearing seats spaced apart along the roll axis. The lower working roll body is rotatably connected between the two lower bearing seats. A lower slag baffle plate is formed by the outward protrusion of the bottom outer side of one of the lower bearing seats. The lower slag baffle plate is rectangular. The bottom of the upper bearing seat is recessed to form a blind hole, and the top of the lower bearing seat is protruding upward to form a support leg. The upper bearing seat is embedded in the blind hole through the support leg to connect with the lower bearing seat.

[0011] Preferably, the step S1 is preceded by the following step: S01, the upper working roller mechanism is lifted to disengage the support leg from the blind hole, and the upper bearing seat of the upper working roller mechanism is driven to rest on the support leg, so that the upper working roller mechanism and the lower working roller mechanism are misaligned along the roller axis; S02, Replace the upper work roll body and / or the lower work roll body to adapt to the change in rolling gap size.

[0012] Preferably, the horizontal extension length of the upper slag baffle is greater than the thickness of the lower slag baffle, and the projection position of the bottom end of the vertical extension section of the upper slag baffle on the lower slag baffle is located in the middle of the lower slag baffle.

[0013] Preferably, the vertical gap between the upper slag baffle and the lower slag baffle is 50mm~55mm; the axial gap between the upper slag baffle and the lower slag baffle is 30mm~40mm.

[0014] Preferably, the upper slag baffle is connected to the upper bearing seat by bolts, and the lower slag baffle is connected to the lower bearing seat by bolts.

[0015] Preferably, both the upper slag baffle and the lower slag baffle are made of wear-resistant material.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for preventing iron oxide scale splashing onto the work rolls of a hot-rolling roughing mill. It employs an upper and lower baffle plate, staggered along the roll axis, to construct a graded baffle system. The lower baffle plate, located on the lower work roll mechanism and extending upwards, provides the initial physical blocking of splashing iron oxide scale. Then, the upper baffle plate, located on the upper work roll mechanism, extending downwards and spaced outside the lower baffle plate, provides a secondary interception of residual iron oxide scale that has crossed the lower baffle plate. Combined with the guiding and cooling effect of the mill cooling water, this effectively prevents iron oxide scale from splashing onto the drive side of the roughing mill, eliminating the source of the splashing in the drive side pipelines. The axially misaligned slag baffle layout can adapt to the relative position changes of the work rolls during roll changing and rolling conditions, avoiding structural interference and ensuring the continuous and smooth operation of roll changing and rolling protection. At the same time, by periodically collecting work roll status data, comparing the current state with the initial state and eliminating deviations exceeding the threshold, the protective accuracy and stable operation of the slag baffle structure can be maintained in real time, avoiding positional shifts that reduce the protective effect after long-term operation. Overall, it improves the operational safety and production reliability of the roughing mill and fills the technical gap in the protection of iron oxide scale splashing on the drive side of the roughing mill. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of a slag-blocking method in one embodiment of the present invention; Figure 2 This is a three-dimensional schematic diagram of the slag-blocking system in the roller-changing state according to one embodiment of the present invention; Figure 3 This is a schematic elevation view of the slag-blocking system in the rolling state according to one embodiment of the present invention; Figure 4 This is a vertical view of the slag-blocking system in the roller-changing state according to one embodiment of the present invention.

[0019] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Upper working roll mechanism; 110. Upper working roll body; 120. Upper bearing seat; 121. Blind hole; 130. Upper slag baffle plate; 20. Lower working roll mechanism; 210. Lower working roll body; 220. Lower bearing seat; 221. Support leg; 230. Lower slag baffle plate. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0025] Please see the appendix Figure 1-4 This invention provides a method for blocking slag on the work rolls of a hot rolling roughing mill to prevent iron oxide scale from splashing. The method is based on a slag-blocking system, which includes an upper work roll mechanism 10 and a lower work roll mechanism 20. The upper work roll mechanism 10 is connected to the top of the lower work roll mechanism 20. An upper slag-blocking plate 130 extending downward is connected to the bottom of one end of the upper work roll mechanism 10, and a lower slag-blocking plate 230 extending upward is connected to the top of one end of the lower work roll mechanism 20. The upper slag-blocking plate 130 and the lower slag-blocking plate 230 are offset along the roll axis, and the upper slag-blocking plate 130 is spaced apart from the outer side of the lower slag-blocking plate 230. The method includes the following steps: S1, Initiate the work roll rolling state and acquire the initial state data of the work roll; The rolling mill pressing system adjusts the relative position of the upper work roll mechanism 10 and the lower work roll mechanism 20 so that the axial end faces of the upper and lower bearing seats 220 are coplanar and without axial misalignment. The work roll drive system starts and establishes the initial roll gap. After the rolling condition enters a stable state, the initial position parameters such as the axial gap and vertical gap between the upper slag baffle plate 130 and the lower slag baffle plate 230 are collected and stored as reference data. This step completes the reference value calibration before the start of each batch of rolling, providing a unified reference standard for the determination of state deviation in the subsequent operation process, avoiding the inaccuracy of deviation determination caused by the installation differences of different roll changing batches, and ensuring the consistency of the protection accuracy benchmark of the slag baffle structure from the initial stage of rolling.

[0026] S2, During the rolling process, splashed iron oxide scale is generated. The lower baffle plate 230 provides initial physical obstruction of the splashed iron oxide scale. The splashed iron oxide scale flows out along both sides of the upper work roll mechanism 10 and the lower work roll mechanism 20 with the mill cooling water. During the rolling process, the high-temperature steel billet is squeezed by the work rolls and impacted by the high-pressure descaling water. The surface oxide layer peels off to form iron oxide scale, which splashes towards the transmission side with the impact force. The lower baffle plate 230, which is fixed to the top of the lower work roll mechanism 20 and extends upward, receives most of the iron oxide scale with medium and low trajectory in the vertical face of the rolling zone. At the same time, relying on the mill cooling water that flows continuously along the surface of the baffle plate, the intercepted iron oxide scale is flushed and guided to the two sides of the upper and lower bearing seats 220 to prevent the iron oxide scale from accumulating and rebounding at the root of the baffle plate. This first line of defense prevents the iron oxide scale from spreading to the dense pipeline area on the transmission side.

[0027] S3, the upper baffle plate 130 provides secondary physical obstruction to the residual iron oxide scale that crosses the lower baffle plate 230. The residual iron oxide scale flows out from the gap between the upper baffle plate 130 and the lower baffle plate 230 with the mill cooling water; and the residual iron oxide scale splashed at the edges flows out to the two sides of the upper baffle plate 130 and the lower baffle plate 230 with the mill cooling water; a small amount of residual iron oxide scale with greater kinetic energy that crosses the top of the lower baffle plate 230 along a high projection trajectory will be fixed at the bottom of the upper work roll mechanism 10, extending downward and spaced apart from the lower baffle plate. The upper slag baffle 130 on the outer side of the slag plate 230 intercepts the iron oxide scale, which falls into the gap between the two slag baffles and is discharged downward along the gap with the continuously flowing mill cooling water. The small amount of iron oxide scale that overflows from both ends of the slag baffle is blocked by the slag baffle in the middle area, and the cooling water concentrates and converges to the two sides to form a large flow of water, which carries the iron oxide scale outward quickly. At the same time, the cooling water rapidly cools down the high-temperature iron oxide scale to prevent the high-temperature iron scale from igniting the transmission side pipeline. The path of iron oxide scale splashing is completely blocked by the graded interception and the coordinated flow of cooling water.

[0028] S4. Acquire the current state data of the work roll at preset intervals and compare it with the initial state data of the work roll. If the difference exceeds the preset threshold range, initiate a deviation elimination command. The preset time interval can be set according to the rolling rhythm and the rate of iron oxide scale accumulation. Under normal production conditions, collect the real-time relative position parameters of the slag baffle plate at fixed cycles. Calculate the difference between the real-time collected gap data and the pre-stored initial reference data to quantitatively determine whether the position deviation in the axial and vertical directions is within the allowable range. This step can actively identify abnormal slag baffle gaps caused by factors such as iron oxide scale adhesion and accumulation, thermal deformation of the slag baffle plate, and bolt loosening due to equipment vibration. Once the deviation exceeds the preset threshold, the deviation elimination action is triggered to prevent the gap abnormality from continuing to expand, leading to protection failure or structural jamming. This achieves active protection and maintenance, ensuring stable slag baffle performance throughout the rolling process.

[0029] S5, End of work roll rolling state; After all rolling passes are completed, the mill pressing system lifts the upper work roll mechanism 10 to open the roll gap, the work roll stops rotating and the rolling force is released, the upper slag baffle 130 is raised synchronously with the upper bearing seat 120, and the vertical gap with the lower slag baffle 230 increases accordingly, the operation of the state data acquisition and deviation elimination system stops synchronously, and the equipment enters the standby or roll change preparation state; This step ensures that after the rolling cycle ends, the slag baffle structure is reset synchronously with the main machine, preparing for subsequent roll change operations or the next batch of rolling, and avoiding the continuous idling of the protection system, which consumes energy and extends the life of components.

[0030] In a preferred embodiment of the present invention, step S4 specifically includes the following steps: S41, displacement sensors installed on the upper work roll mechanism 10 and the lower work roll mechanism 20 collect the current status data of the work rolls in real time at preset intervals; wherein, the current status data of the work rolls includes the actual axial gap and the actual vertical gap between the upper slag baffle plate 130 and the lower slag baffle plate 230; non-contact laser displacement sensors are arranged on the transmission side end faces of the upper bearing seat 120 and the lower bearing seat 220, the axial sensor detects the horizontal relative distance between the two slag baffle plates, and the vertical sensor detects the vertical relative distance between the top of the slag baffle plate and the corresponding mating surface. The sensors are arranged to avoid high-temperature areas to ensure detection accuracy and service life; the preset acquisition interval can be adjusted according to the production condition configuration, with a fixed duration for normal production and a shortened acquisition interval for high-speed rolling or high descaling pressure conditions; through precise acquisition at fixed points and in fixed directions, the status data is ensured to truly reflect the actual working conditions of the slag baffle gap, providing reliable data input for subsequent deviation calculation and processing.

[0031] S42, the difference between the actual axial clearance and actual vertical clearance and the initial state data of the work roll is calculated; wherein, the initial state data of the work roll includes the initial axial clearance and initial vertical clearance between the upper slag baffle plate 130 and the lower slag baffle plate 230, so as to obtain the axial clearance deviation value and the vertical clearance deviation value, and determine whether the axial clearance deviation value and the vertical clearance deviation value exceed the preset allowable tolerance range; the initial state data is taken from the steady state condition when the rolling preparation is completed and the work roll is in the initial pass roll gap position. In this state, the bearing seat 220 is axially fully aligned, there is no iron oxide scale accumulation, and the slag baffle plate is in the room temperature installation state; the difference calculation uses the absolute difference between the actual value and the initial value to obtain the independent deviation values ​​in two directions. The preset allowable tolerance range is determined by comprehensively considering the slag baffle plate design clearance, thermal expansion, and equipment vibration allowable. The deviations in the two directions are compared with the corresponding tolerances. If either direction exceeds the range, it is judged as abnormal. The slag baffle clearance state is comprehensively controlled from two dimensions to avoid the omission of abnormalities in a single direction.

[0032] In a preferred embodiment of the present invention, step S42 is followed by the following step: S43, if the axial clearance deviation value or the vertical clearance deviation value exceeds the allowable tolerance range, a deviation elimination command containing the deviation position coordinates and deviation magnitude is generated; when the clearance is determined to be abnormal, the system uses the installation coordinates of the displacement sensor and the real-time deviation value to calculate and locate the specific axial and vertical positions with the largest clearance deviation through interpolation, and integrates them to generate a control command containing the three-dimensional coordinates of the deviation, the deviation direction and the deviation magnitude. The command synchronously matches the injection pressure and injection duration parameters corresponding to the deviation magnitude; this step enables the subsequent cleaning action to accurately correspond to the deviation area and severity, achieve targeted cleaning, avoid indiscriminate scouring of the entire baffle plate, improve cleaning efficiency while reducing cooling water consumption.

[0033] S44, according to the deviation elimination command, the adaptive universal nozzles set on the edges of the upper slag baffle 130 and the lower slag baffle 230 are linked and controlled to dynamically adjust the spray angle of the adaptive universal nozzles, so that the cooling water spray focus is precisely concentrated at the position with the largest gap deviation value to form a spray water curtain and maintain it for a preset spray time, so as to remove the adhering iron oxide scale and prevent the iron oxide scale from blocking the gap between the upper slag baffle 130 and the lower slag baffle 230; the adaptive universal nozzles (not shown in the figure) are evenly distributed along the axial edge of the slag baffle, and the nozzles are driven by independent servo motors, which have bidirectional pitch and yaw capabilities. Adjusting the degree of freedom; upon receiving the deviation elimination command, the servo system calculates the adjustment angle of each nozzle in real time based on the deviation position coordinates, so that the spray focus of the nozzles involved in the work converges on the gap area with the largest deviation, forming a high-density local water curtain. The spray pressure and duration are dynamically matched with the magnitude of the deviation. The high-pressure water curtain directly impacts the iron oxide scale accumulated in the gap, dispersing the adhered and stuck iron oxide scale and discharging it with the water flow, relieving the stuck effect of the iron oxide scale on the slag baffle plate, restoring the slag baffle gap to the design range, avoiding gap blockage that would hinder the relative movement of the slag baffle plate, and preventing abnormal expansion of the gap that would create a protective loophole.

[0034] S45, if the axial clearance deviation or the vertical clearance deviation is within the allowable tolerance range, the deviation elimination command is not executed, and the process returns to step S41; when the clearance deviations in both directions are within the preset allowable tolerance range, it is determined that the current slag baffle clearance is in a normal protection state, the amount of iron oxide scale accumulation does not affect the clearance size, and no cleaning action is required; the system then returns to the periodic data acquisition step, maintains continuous monitoring at predetermined time intervals, reduces unnecessary nozzle actions and cooling water consumption while ensuring protection reliability, lowers equipment operating costs, and avoids frequent high-pressure flushing that accelerates the surface wear of the slag baffle.

[0035] In a preferred embodiment of the present invention, step S44 further includes the step of: S441, after executing the deviation elimination command, the system again determines whether the axial clearance deviation value or the vertical clearance deviation value meets the requirements; after completing the spray cleaning for the preset time, the system pauses the nozzle spraying, and after the water flow stabilizes and the residual water in the gap is discharged, the displacement sensor is triggered again to collect the current axial clearance and vertical clearance data, and the deviation values ​​in the two directions are recalculated; the actual effect of this cleaning action is verified to avoid incomplete cleaning in a single operation due to the adhesion and excessive accumulation of iron oxide scale, and to ensure that the gap condition is truly restored to qualified before returning to normal monitoring.

[0036] S442, if yes, then return to step S41; after verification, if both the axial clearance deviation and the vertical clearance deviation fall back to the allowable tolerance range, it indicates that the iron oxide scale accumulation has been effectively removed and the slag-blocking clearance has returned to normal protective status; the system ends the deviation processing flow, controls the adaptive universal nozzle to reset to the standby angle, returns to the periodic status acquisition step, and continues to perform normal clearance monitoring according to the preset cycle to maintain continuous and stable protection during the rolling process.

[0037] S443, if not, the adaptive universal nozzle will be activated again for secondary cleaning; if the gap deviation in any direction still exceeds the allowable tolerance after verification, it indicates that a single high-pressure water flush is insufficient to completely remove the accumulated iron oxide scale, and there may be cases of iron oxide scale sintering and adhesion, or excessive accumulation; the system will then trigger a secondary cleaning command, appropriately increase the nozzle spray pressure and extend the spray duration, and activate the adaptive universal nozzle again to target the deviation area for enhanced flushing, thereby improving the cleaning success rate through secondary processing and restoring the gap to normal state as much as possible without manual intervention.

[0038] S444: If the requirements are still not met after the second cleaning, a warning signal will be issued. If the gap deviation still cannot be reduced to the allowable tolerance range after two consecutive high-pressure water cleanings, it is determined that the gap abnormality is not simply caused by the accumulation of iron oxide scale, but may be due to mechanical structural faults such as heat deformation of the slag baffle plate, loosening and displacement of connecting bolts, or misalignment of bearing seats. At this time, the system will immediately stop the automatic cleaning action, send an audible and visual warning signal to the main control room and the on-site operation and maintenance terminal, and upload deviation data and fault location information to prompt the operation and maintenance personnel to stop the machine in time for manual inspection and repair, so as to prevent the slag baffle structure from jamming and being damaged or the protection from failing due to the faulty operation, which may lead to safety accidents.

[0039] In a preferred embodiment of the present invention, the upper working roller mechanism 10 includes an upper working roller body 110 and two upper bearing seats 120 spaced apart along the roller axial direction. The upper working roller body 110 is rotatably connected between the two upper bearing seats 120. An upper slag baffle 130 is formed by protruding outward from the bottom outer side of one of the upper bearing seats 120. The upper slag baffle 130 is L-shaped. The lower working roller mechanism 20 includes a lower working roller body 210 and two upper bearing seats 120 spaced apart along the roller axial direction. The lower bearing seat 220 is rotatably connected to the lower working roller body 210 between the two lower bearing seats 220. A lower baffle plate 230 is formed by protruding outward from the bottom of one of the lower bearing seats 220. The lower baffle plate 230 is rectangular. The bottom of the upper bearing seat 120 is recessed to form a blind hole 121. The top of the lower bearing seat 220 is protruding upward to form a support leg 221. The upper bearing seat 120 is embedded in the blind hole 121 through the support leg 221. 1. The upper work roll body 110 is connected to the lower bearing seat 220; the two ends of the roll neck are assembled in the upper bearing seat 120 through bearings and can rotate freely around its own axis. The L-shaped upper slag baffle 130 on the outer side of the upper bearing seat 120 on the transmission side has a horizontal section connected to the bearing seat body and a vertical section that extends downward to form a downward intercepting surface. The lower work roll body 210 is similarly assembled in the lower bearing seat 220. The rectangular lower slag baffle 230 on the top of the lower bearing seat 220 on the transmission side faces the rolling splash direction. In the braking state, the support leg 221 is embedded in the blind hole 121 to achieve precise axial positioning of the upper and lower bearing seats 220, ensuring the alignment accuracy of the upper and lower slag baffles 230. This structure integrates the slag baffles onto the bearing seats, which move synchronously with the work rolls, keeping the relative position of the slag baffles and the rolling zone constant and the protection range stable. At the same time, the cooperation structure between the blind hole 121 and the support leg 221 not only ensures the rolling alignment accuracy but also provides a structural basis for roll change misalignment, achieving compatibility between protection function and roll change convenience.

[0040] Furthermore, the step S1 is preceded by the following step: S01, the upper work roll mechanism 10 is lifted to disengage the support leg 221 from the blind hole 121, and the upper bearing seat 120 of the upper work roll mechanism 10 is driven to rest on the support leg 221, so that the upper work roll mechanism 10 and the lower work roll mechanism 20 are misaligned along the roll axis; before the roll changing operation, the mill pressing force is released, and the upper work roll mechanism 10 is lifted by the mill roll changing lifting device, so that the support leg 221 at the top of the lower bearing seat 220 is completely pulled out from the blind hole 121 at the bottom of the upper bearing seat 120, and then the upper work roll mechanism 20 is moved laterally. The roller mechanism 10 allows the bottom surface of the upper bearing seat 120 to rest on the top support surface of the support leg 221. At this time, the upper working roller mechanism 10 and the lower working roller mechanism 20 generate a fixed misalignment along the roller axis, which drives the upper slag baffle 130 and the lower slag baffle 230, which are respectively installed on the outside of the two, to form an axial spatial interlacing. The two slag baffles have no overlapping projection area in the vertical direction. The upper and lower working roller mechanisms 20 can be pulled out and replaced independently. There will be no collision or interference between the slag baffles, ensuring the spatial freedom of the roller changing operation, and at the same time avoiding damage to the slag baffle structure during the roller changing process.

[0041] S02, replace the upper work roll body 110 and / or the lower work roll body 210 to adapt to changes in the rolling gap size; with the upper and lower work roll mechanisms 20 axially misaligned and the slag baffles not interfering with each other, the upper work roll body 110 or the lower work roll body 210 can be pulled out along the mill track respectively, and a new work roll of the corresponding diameter can be replaced; by replacing work rolls of different diameters, the initial size of the rolling gap can be adjusted to adapt to the rolling pass requirements of different specifications of steel billets; after the roll replacement is completed, the work roll mechanism is reset, the support leg 221 is re-embedded into the blind hole 121 to achieve precise alignment, and the slag baffles are restored to the rolling protection cooperation state. The entire roll replacement process does not require disassembling the slag baffles, which greatly shortens the roll replacement auxiliary time and improves production efficiency.

[0042] Furthermore, the horizontal extension length of the upper baffle plate 130 is greater than the thickness of the lower baffle plate 230, and the projection position of the bottom end of the vertical extension section of the upper baffle plate 130 onto the lower baffle plate 230 is located at the middle of the lower baffle plate 230; the extension length of the horizontal section of the upper baffle plate 130 along the roller axis is greater than the thickness of the lower baffle plate 230, ensuring that in the axial direction, the vertical section of the upper baffle plate 130 can completely cover the top width of the lower baffle plate 230, preventing iron oxide scale from falling from the top of the lower baffle plate 230. The axial edge of the plate directly passes through the protective structure after being flipped over; the vertical projection of the bottom end of the vertical extension of the upper slag baffle 130 onto the surface of the lower slag baffle 230 is located in the middle area of ​​the lower slag baffle 230, so that the two slag baffles form a sufficient overlap in the vertical direction. This ensures that the lower slag baffle 230 can be smoothly embedded into the space between the upper slag baffle 130 and the upper bearing seat 120, and can also effectively intercept the iron oxide scale that flips over the lower slag baffle 230, preventing the iron oxide scale from flying out from the overlap gap between the two slag baffles due to insufficient overlap.

[0043] Furthermore, the vertical gap between the upper slag baffle plate 130 and the lower slag baffle plate 230 is 50mm~55mm; the axial gap between the upper slag baffle plate 130 and the lower slag baffle plate 230 is 30mm~40mm. The value of the vertical gap takes into account the change in roll gap during each rolling pass, the thermal expansion of the slag baffle plate at high temperature, and the vertical runout caused by equipment vibration. This ensures that even under extreme conditions of maximum reduction and highest operating temperature, the top of the lower slag baffle plate 230 will not come into contact with or collide with the upper slag baffle plate 130, avoiding jamming and wear. At the same time, the gap is controlled within a small range to prevent a large amount of iron oxide scale from penetrating through the vertical gap. The value of the axial gap can accommodate the axial movement of the bearing housing and the axial thermal expansion of the slag baffle plate, avoiding axial contact friction, while maintaining the tightness of axial protection. This parameter range balances the reliability of equipment operation and the slag protection effect.

[0044] Furthermore, the upper baffle plate 130 is connected to the upper bearing seat 120 by bolts, and the lower baffle plate 230 is connected to the lower bearing seat 220 by bolts. The upper baffle plate 130 and the upper bearing seat 120, and the lower baffle plate 230 and the lower bearing seat 220, are both fastened together by multiple sets of bolts. The bearing seat has corresponding internal threaded holes, and the baffle plate has a corresponding number of mounting through holes. The bolted connection structure makes the baffle plate detachable. When the baffle plate is worn or deformed, it can be disassembled and replaced individually without replacing the entire bearing seat, reducing maintenance costs. Simultaneously, the installation gap of the baffle plate can be finely adjusted by adjusting the bolt fastening position or adding adjusting shims to adapt to the assembly requirements of work rolls with different diameters, improving the versatility and assembly flexibility of the baffle structure.

[0045] Furthermore, both the upper slag baffle plate 130 and the lower slag baffle plate 230 are made of wear-resistant materials; both the upper slag baffle plate 130 and the lower slag baffle plate 230 are made of wear-resistant alloy steel, and the surface can be hardened by quenching; the wear-resistant material has high hardness and impact toughness, can withstand the high-speed continuous impact of high-temperature iron oxide scale, resist the long-term scouring and corrosion of the rolling mill cooling water, reduce the wear, pitting and deformation of the slag baffle plate surface, maintain the dimensional and installation accuracy of the slag baffle plate for a long time, extend the service life of the slag baffle plate, reduce the frequency of replacement, and reduce long-term operation and maintenance costs; at the same time, the wear-resistant material has good high-temperature stability and is not easy to soften and deform in the high-temperature rolling environment, ensuring the long-term stability of the slag baffle gap and ensuring continuous protective performance.

[0046] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preventing iron oxide scale from splashing onto the work rolls of a hot rolling roughing mill, characterized in that, The method is based on a slag-blocking system, which includes an upper working roller mechanism and a lower working roller mechanism. The upper working roller mechanism is connected to the top of the lower working roller mechanism. An upper slag-blocking plate extending downward is connected to the bottom of one end of the upper working roller mechanism, and a lower slag-blocking plate extending upward is connected to the top of one end of the lower working roller mechanism. The upper slag-blocking plate and the lower slag-blocking plate are offset along the roller axis, and the upper slag-blocking plate is spaced apart from the outside of the lower slag-blocking plate. The method includes the following steps: S1, Initiate the work roll rolling state and acquire the initial state data of the work roll; S2, During the rolling process, splashed iron oxide scale is generated. The lower slag baffle plate provides initial physical obstruction of the splashed iron oxide scale, which then flows out along both sides of the upper and lower work roll mechanisms with the mill cooling water. S3, the upper slag baffle plate provides secondary physical obstruction for residual iron oxide scale that crosses the lower slag baffle plate, and the residual iron oxide scale flows out from the gap between the upper slag baffle plate and the lower slag baffle plate with the mill cooling water; and the residual iron oxide scale splashed at the edges flows out to the two side edges of the upper slag baffle plate and the lower slag baffle plate with the mill cooling water. S4. Acquire the current state data of the work roll at preset time intervals and compare it with the initial state data of the work roll. If the difference exceeds the preset threshold range, start the deviation elimination command. S5, end the work roll rolling state.

2. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 1, characterized in that, Step S4 specifically includes the following steps: S41, by means of displacement sensors installed on the upper working roll mechanism and the lower working roll mechanism, the current status data of the working roll is collected in real time at preset intervals; wherein, the current status data of the working roll includes the actual axial gap and the actual vertical gap between the upper baffle plate and the lower baffle plate; S42, calculate the difference between the actual axial clearance and the actual vertical clearance and the initial state data of the work roll; wherein, the initial state data of the work roll includes the initial axial clearance and the initial vertical clearance between the upper slag baffle and the lower slag baffle, so as to obtain the axial clearance deviation value and the vertical clearance deviation value, and determine whether the axial clearance deviation value and the vertical clearance deviation value exceed the preset allowable tolerance range.

3. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 2, characterized in that, The step S42 is followed by the following step: S43, if the axial clearance deviation value or the vertical clearance deviation value exceeds the allowable tolerance range, generate a deviation elimination command containing the deviation position coordinates and the deviation magnitude; S44, according to the deviation elimination command, the adaptive universal nozzles set on the edges of the upper slag baffle and the lower slag baffle are linked and controlled to dynamically adjust the spray angle of the adaptive universal nozzles, so as to accurately concentrate the cooling water spray focus at the position with the largest gap deviation value to form a spray water curtain and maintain the preset spray time, so as to remove the adhering iron oxide scale and prevent the iron oxide scale from blocking the gap between the upper slag baffle and the lower slag baffle. S45, if the axial clearance deviation value or the vertical clearance deviation value is within the allowable tolerance range, the deviation elimination command is not executed, and the process returns to step S41.

4. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 3, characterized in that, Step S44 further includes the following step: S441, after executing the deviation elimination command, it is determined again whether the axial clearance deviation value or the vertical clearance deviation value meets the requirements; S442, if yes, then return to step S41; S443, if not, then the adaptive universal nozzle will be activated again for secondary cleaning; S444: If the requirement is still not met after the second clearing, a warning signal will be issued.

5. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 1, characterized in that, The upper working roll mechanism includes an upper working roll body and two upper bearing seats spaced apart along the roll axis. The upper working roll body is rotatably connected between the two upper bearing seats. An upper slag baffle plate is formed by the outward protrusion of the bottom outer side of one of the upper bearing seats. The upper slag baffle plate is L-shaped. The lower working roll mechanism includes a lower working roll body and two lower bearing seats spaced apart along the roll axis. The lower working roll body is rotatably connected between the two lower bearing seats. A lower slag baffle plate is formed by the outward protrusion of the bottom outer side of one of the lower bearing seats. The lower slag baffle plate is rectangular. The bottom of the upper bearing seat is recessed to form a blind hole, and the top of the lower bearing seat is protruding upward to form a support leg. The upper bearing seat is embedded in the blind hole through the support leg to connect with the lower bearing seat.

6. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 5, characterized in that, The step preceding step S1 includes the following steps: S01, the upper working roller mechanism is lifted to disengage the support leg from the blind hole, and the upper bearing seat of the upper working roller mechanism is driven to rest on the support leg, so that the upper working roller mechanism and the lower working roller mechanism are misaligned along the roller axis; S02, Replace the upper work roll body and / or the lower work roll body to adapt to the change in rolling gap size.

7. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 5, characterized in that, The horizontal extension length of the upper slag baffle is greater than the thickness of the lower slag baffle, and the projection position of the bottom end of the vertical extension section of the upper slag baffle on the lower slag baffle is located in the middle of the lower slag baffle.

8. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 5, characterized in that, The vertical gap between the upper slag baffle and the lower slag baffle is 50mm~55mm; the axial gap between the upper slag baffle and the lower slag baffle is 30mm~40mm.

9. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 5, characterized in that, The upper slag baffle is connected to the upper bearing seat by bolts, and the lower slag baffle is connected to the lower bearing seat by bolts.

10. The method for preventing iron oxide scale splashing on the work rolls of a hot rolling roughing mill according to claim 1, characterized in that, Both the upper slag baffle and the lower slag baffle are made of wear-resistant materials.

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