A control method for reducing liquid residue on the edges of a strip

Abstract

The application provides a control method for reducing liquid residue on the edge of a strip steel, comprising the following steps: S1, controlling a blowing device to have a preset nozzle spacing in a horizontal direction; the blowing device comprises a first gas supply mechanism, a first blowing mechanism, a second gas supply mechanism and a second blowing mechanism; the first gas supply mechanism supplies gas to the first blowing mechanism, and the second gas supply mechanism supplies gas to the second blowing mechanism; S2, obtaining a conveying speed of the strip steel; when the conveying speed is greater than a first preset speed and less than a second preset speed, the number of open valves of the first gas supply mechanism and the second gas supply mechanism is controlled to be a first preset number; when the conveying speed is not less than the second preset speed, the number of open valves of the first gas supply mechanism and the second gas supply mechanism is controlled to be a second preset number; the second preset speed is greater than the first preset speed, and the second preset number is less than the first preset number. The application can reduce liquid residue on the edge of the strip steel.

Description

Technical Field

[0001] This invention belongs to the field of steel, and specifically relates to a method for controlling liquid residue at the edges of steel strips. Background Technology

[0002] In the strip steel rolling industry, cold rolling is a process of thinning strip steel to the target thickness by rolling it below the recrystallization temperature using rolls. Cold rolling includes continuous rolling, reversible rolling, and stress-relief rolling. During the rolling process, the high rolling speed, large rolling force, and significant strip deformation generate heat, causing roll deformation and abnormal strip surface shape, failing to meet quality requirements. Simultaneously, friction between the rolls and the strip during rolling produces iron filings and powder, contaminating the strip surface. Therefore, rolling fluid is required for cooling, cleaning, and lubrication during cold rolling. Since the strip width is smaller than the roll width, when rolling strip with rolling fluid, besides forming a film on the strip surface, excess fluid remains through the roll gap, forming blemishes and defects that affect product quality. Strips with blemishes require rework, wasting significant amounts of steel, increasing production costs, and reducing product market competitiveness.

[0003] Chinese utility model patent CN205128617U discloses a rolling mill spray cooling and purging system. This system features rolling fluid spray devices symmetrically arranged along the upper and lower surfaces of the strip within the rolling mill stand, and symmetrically arranged around the mill centerline. Additionally, spray purging devices are symmetrically arranged along the upper and lower surfaces of the strip, and around the mill centerline, in a separate section adjacent to the rolling mill stand exit side. This system can only remove most of the rolling fluid from the middle of the strip surface, and cannot prevent rolling fluid residue from remaining at the edges.

[0004] Chinese invention patent CN108160722A discloses a method for optimizing the spray direction angle of emulsion nozzles in a secondary cold rolling mill. This method improves the spraying effect of the emulsion, making the emulsion spray more uniform on the strip surface, thereby reducing the probability of defects such as poor strip shape and emulsion residue caused by uneven emulsion spraying. However, this method fails to solve the problem of difficulty in purging emulsion residue from the edges of the strip.

[0005] Chinese utility model patent CN209792263U discloses a device for preventing emulsion from splashing onto the steel plate surface and forming emulsion stains in a 20-roll mill wiper. The device includes a track rod and an integral movable baffle, which comprises a steel pipe, a fixing plate, and a replaceable rubber plate. This utility model mainly solves the problem of the current 20-roll mill wiper's unreasonable structure, where emulsion splashes from the gaps in the areas without steel plate at the edges of the wiper rollers on both sides of the strip, dripping onto the strip surface and forming emulsion stains. This device requires frequent replacement of the rubber plate, and the removal of residual emulsion at the edges is incomplete, making it difficult to remove emulsion remaining on the strip surface.

[0006] Therefore, it is necessary to provide a control method for reducing liquid residue at the edge of the strip to solve or at least alleviate the aforementioned technical defect of excessive liquid residue at the edge of the strip. Summary of the Invention

[0007] The main objective of this invention is to provide a method for controlling liquid residue at the edge of strip steel, thereby solving the aforementioned technical problem of excessive liquid residue at the edge of strip steel.

[0008] To achieve the above objectives, the present invention provides a method for controlling liquid residue at the edge of a strip steel, comprising the following steps:

[0009] S1, the purging device is controlled to have a preset nozzle spacing in the horizontal direction; the preset nozzle spacing is less than the width of the strip; wherein, the purging device includes a first air supply mechanism, a first purging mechanism, a second air supply mechanism, and a second purging mechanism, the first air supply mechanism supplies air to the first purging mechanism, and the second air supply mechanism supplies air to the second purging mechanism; the first purging mechanism is located near the first side of the strip, and the second purging mechanism is located near the second side of the strip; nozzles are installed above and below the strip on both the first purging mechanism and the second purging mechanism;

[0010] The first gas supply mechanism is connected to the first purging mechanism through at least two first gas supply ports, and each first gas supply port is provided with a first valve; the second gas supply mechanism is connected to the second purging mechanism through at least two second gas supply ports, and each second gas supply port is provided with a second valve.

[0011] S2, control the first gas supply mechanism to supply gas to the first purging mechanism, and control the second gas supply mechanism to supply gas to the second purging mechanism;

[0012] The conveying speed of the strip is obtained. When the conveying speed is greater than a first preset speed and less than a second preset speed, the opening amount of the first valve and the second valve is controlled to be a first preset number. When the conveying speed is not less than the second preset speed, the opening amount of the first valve and the second valve is controlled to be a second preset number. Wherein, the second preset speed is greater than the first preset speed, and the second preset number is less than the first preset number.

[0013] Furthermore, the first preset speed is 0-3 m / min, and the second preset speed is 370-430 m / min.

[0014] Furthermore, the gas supply pressure of both the first and second gas supply mechanisms is 3-5 bar.

[0015] Furthermore, the first preset quantity is an integer multiple of the second preset quantity.

[0016] Furthermore, there are two of each of the first and second air supply ports.

[0017] Furthermore, step S1 also includes: obtaining the angle between the nozzle of the purging device and the strip steel, and controlling the angle to be 45-60 degrees.

[0018] Furthermore, step S1 further includes: acquiring the current ambient temperature; when the ambient temperature is less than the reference temperature, controlling the purging temperature of the purging device to a first preset temperature; when the ambient temperature is not less than the reference temperature, controlling the purging temperature of the purging device to a second preset temperature; the second preset temperature is less than the first preset temperature.

[0019] Furthermore, the reference temperature is 10-20℃, the second preset temperature is 40-60℃, and the first preset temperature is 80-100℃.

[0020] Furthermore, the preset nozzle spacing is equal to the width of the strip minus the preset total sweeping distance, and the preset total sweeping distance is equal to the sum of the sweeping distance of the first side and the sweeping distance of the second side.

[0021] Further, in step S1, the process of controlling the purging device to have a preset nozzle spacing in the horizontal direction includes:

[0022] The real-time nozzle spacing of the purging device in the horizontal direction is obtained. When the real-time nozzle spacing is less than the preset nozzle spacing, the first difference between the preset nozzle spacing and the real-time nozzle spacing is analyzed, and the nozzles in the first purging mechanism and the second purging mechanism are controlled to move laterally outward to the preset nozzle spacing according to the first difference.

[0023] When the real-time nozzle spacing is greater than the preset nozzle spacing, the second difference between the real-time nozzle spacing and the preset nozzle spacing is analyzed, and the nozzles in the first and second blowing mechanisms are controlled to move laterally inward to the preset nozzle spacing based on the second difference.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] This invention automatically adjusts the compressed air purging width and valve opening amount according to different strip width specifications and rolling speeds. This improves the purging efficiency of residual rolling fluid on the strip surface, reduces fluid residue on the strip edges, automates operation, reduces the labor intensity of operators, and saves costs. Furthermore, by rationally setting multiple process parameters such as air supply pressure, valve opening amount, angle, and temperature, this invention further ensures that there is no leveling fluid residue or blemishes on the strip edges at the leveling machine exit. Therefore, this invention effectively solves the problem of edge blemishes on strip surfaces, improves product surface quality, and enhances product competitiveness. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a flowchart illustrating a method for controlling liquid residue at the edge of a strip steel according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the purging device in one embodiment of the present invention (the first and second air supply mechanisms are not shown).

[0029] Reference numerals: 1. Steel strip; 2. Fixing pipe; 3. First screw; 4. Second screw; 5. First flexible hose; 6. First rigid pipe; 7. First upper exhaust pipe; 8. First lower exhaust pipe; 9. First upper nozzle; 10. First lower nozzle; 11. Second flexible hose; 12. Second rigid pipe; 13. Second upper exhaust pipe; 14. Second lower exhaust pipe; 15. Second upper nozzle; 16. Second lower nozzle; 17. First sleeve; 18. First driving component; 19. Second sleeve; 20. Second driving component.

[0030] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] 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 them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number and order of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0034] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0035] It should be noted that although the rolling fluid (including emulsion and leveling fluid) on the strip surface is treated during the strip production process, some liquid will still remain on the edges of the strip. The strip production process can be as follows: steelmaking, continuous casting, hot rolling, pickling, cold rolling, bell-type annealing, and leveling. The leveling fluid used in the leveling process is also considered part of the rolling fluid in this invention. Taking the leveling fluid as an example, the leveling unit sprays a large flow of leveling fluid at the inlet side during rolling to lubricate and clean the strip surface and improve its surface quality. The leveling fluid forms a dam of a certain thickness on the strip surface at the work roll inlet side, achieving the effect of cleaning and cooling the rolls and the strip. Because the work roll surface is wider than the strip being rolled, there is a certain gap between the upper and lower work rolls on both sides of the strip. The leveling fluid on the work roll will splash through this gap onto the strip surface at the outlet side, especially the edges of the strip. Some of the water in the leveling fluid evaporates, leaving oil to form a protective oil film that prevents the strip from rusting. However, some excess water fails to evaporate in time, remaining between the strip layers and forming rust spots. Therefore, timely and effective evaporation of the residual leveling fluid on the exit surface of the strip is crucial to preventing rust spots. Of course, both continuous rolling mills and reversible rolling mills leave residual rolling fluid on both sides of the exit strip. Some strips that cannot be processed in subsequent processes will develop edge spots. Since leveling is a final process, this invention preferably removes the residual fluid from the edges of the strip 1 directly at the exit of the leveling mill.

[0036] Based on this, the present invention provides a method for controlling liquid residue at the edge of a strip steel, comprising the following steps:

[0037] S1, the blowing device is controlled to have a preset nozzle spacing in the horizontal direction; the preset nozzle spacing is less than the width of the strip 1, so as to ensure that the blowing device can blow the edge of the strip 1. That is, the nozzle of the blowing device needs to be positioned above or below the strip 1, corresponding to the strip 1 in the vertical direction, and not exceeding the corresponding vertical area of ​​the strip 1.

[0038] It should be noted that before entering the purging device, the edge surface of the strip 1 has residual liquid, such as leveling fluid. The purging device is typically installed at the outlet of a rolling mill or leveling machine to purge the liquid from the edge of the strip 1. The purging device includes a first air supply mechanism, a first purging mechanism, a second air supply mechanism, and a second purging mechanism. The first air supply mechanism supplies air to the first purging mechanism, and the second air supply mechanism supplies air to the second purging mechanism. The first purging mechanism is located near the first side of the strip 1, and the second purging mechanism is located near the second side of the strip 1. The first and second sides are opposite each other and are parallel to the conveying direction of the strip 1, corresponding to the two sides of the strip 1 in the conveying direction, respectively. Both the first and second purging mechanisms are equipped with nozzles above and below the strip 1, and the number of nozzles can be multiple. Both the first and second purging mechanisms can move laterally as a whole under the drive of a servo motor, thereby moving the nozzles.

[0039] Specifically, the first purging mechanism has a first upper nozzle 9 located above the strip 1 and a first lower nozzle 10 located below the strip 1, and the second purging mechanism has a second upper nozzle 15 located above the strip 1 and a second lower nozzle 16 located below the strip 1; the nozzle spacing of the purging device in the horizontal direction refers to the distance between the first upper nozzle 9 and the second upper nozzle 15, and the distance between the first lower nozzle 10 and the second lower nozzle 16. Since the first upper nozzle 9 and the first lower nozzle 10 are usually arranged vertically in correspondence, and the second upper nozzle 15 and the second lower nozzle 16 are also usually arranged vertically in correspondence, and the first upper nozzle 9 and the first lower nozzle 10 move together with the first blowing mechanism, and the second upper nozzle 15 and the second lower nozzle 16 move together with the second blowing mechanism, the distance between the first upper nozzle 9 and the second upper nozzle 15 is the same as the distance between the first lower nozzle 10 and the second lower nozzle 16, and both can be regarded as the nozzle spacing of the blowing device in the horizontal direction.

[0040] To regulate the compressed air and ensure effective removal of residual liquid from the strip edges at different conveying rates, the first air supply mechanism is connected to the first purging mechanism via at least two first air supply ports, each equipped with a first valve; the second air supply mechanism is connected to the second purging mechanism via at least two second air supply ports, each equipped with a second valve.

[0041] The number and specifications of the first and second air supply ports can be the same. When multiple first valves are open, the compressed air provided by the first air supply mechanism is sent into the first purging mechanism from multiple first air supply ports, and then blown towards the first side of the strip from the nozzle of the first purging mechanism. When only one first valve is open, the compressed air provided by the first air supply mechanism is sent into the first purging mechanism only from the opened first air supply port, and then blown towards the first side of the strip from the nozzle of the first purging mechanism. When multiple second valves are open, the compressed air provided by the second air supply mechanism is sent into the second purging mechanism from multiple second air supply ports, and then blown towards the second side of the strip from the nozzle of the second purging mechanism. When only two second valves are open, the compressed air provided by the second air supply mechanism is sent into the second purging mechanism only from the opened second air supply ports, and then blown towards the second side of the strip from the nozzle of the second purging mechanism. As one implementation, the at least two first air supply ports can be opened on the air supply side of the first air supply mechanism, and the at least two second air supply ports can be opened on the air supply side of the second air supply mechanism, so as to facilitate the supply of compressed air to the purging mechanism.

[0042] S2, control the first gas supply mechanism to supply gas to the first purging mechanism, and control the second gas supply mechanism to supply gas to the second purging mechanism.

[0043] The conveying speed of the strip is obtained. When the conveying speed is greater than a first preset speed and less than a second preset speed, the opening amount of the first valve and the second valve is controlled to be a first preset number. When the conveying speed is not less than the second preset speed, the opening amount of the first valve and the second valve is controlled to be a second preset number. When the conveying speed is not greater than the first preset speed, the opening amount of the first valve and the second valve is controlled to be 0.

[0044] Wherein, the second preset rate is greater than the first preset rate, and the second preset quantity is less than the first preset quantity. The opening amount of the first valve and the second valve refers to the number of times the first valve and the second valve are fully open. When the first valve and the second valve are not fully open, they are in a closed state.

[0045] It should be noted that in this invention, the first preset speed can be 0-3m / min, specifically 0m / min; the second preset speed is 370-430m / min, specifically 400m / min.

[0046] In order to effectively purge the residual liquid on the edge of the strip, the air supply pressure of both the first air supply mechanism and the second air supply mechanism can be 3-5 bar; the air supply pressure refers to the output air pressure of the first air supply mechanism and the second air supply mechanism; that is, the air pressure of compressed air before entering the first air supply port and the second air supply port.

[0047] In this invention, the first preset quantity can be an integer multiple of the second preset quantity; specifically, the number of both the first and second air supply ports can be two. In this case, in the same air supply mechanism, the valve of one air supply port is defined as V1, and the valve of the other air supply port is defined as V2; when the delivery rate is greater than the first preset rate and less than the second preset rate, the valves of both air supply ports are open; when the delivery rate is not less than the second preset rate, only the valve of one air supply port is opened.

[0048] For example, see Figure 1 As shown, the implementation process of the present invention can be as follows:

[0049] Step 1: Start conventional rolling. The steel coil is fed onto the leveling machine and uncoiler to prepare for rolling.

[0050] Step 2: The width information of the rolled steel coil is transmitted to the data processor from the secondary machine L2. The processor determines whether the horizontal nozzle spacing of the blowing device matches the width of the strip to be rolled. If they match, the servo motor remains stationary, and the horizontal nozzle spacing of the blowing device remains unchanged. If they do not match, the servo motor receives a pulse signal and drives the blowing mechanism to adjust the horizontal nozzle spacing of the blowing device to the set position.

[0051] Step 3: The rolling mill is started, driving strip 1 to run; the running speed v of strip 1 is transmitted to the control system.

[0052] Step 4: The control system determines whether the speed of strip 1 is ≥400m / min. If it is, V1 valve opens and V2 valve closes, and the nozzle blows out compressed air at constant pressure to the edge of the strip 1 surface. If V is not ≥400m / min, the control system determines the speed again.

[0053] That is, first determine whether the conveying rate is not less than the second preset rate. If yes, then control the opening amount of the first valve and the second valve to be the second preset amount. If no, then perform the judgment in the subsequent steps.

[0054] Step 5: If the control system determines that the speed V of strip 1 is true (V > 0 m / min), then valves V1 and V2 open, and the nozzle blows compressed air onto the edge of the strip 1 surface; if not, then valves V1 and V2 close, and the nozzle does not blow compressed air.

[0055] That is, when it is not the case that the conveying rate is not less than the second preset rate, it is determined whether the conveying rate is greater than the first preset rate. If yes, the opening amount of the first valve and the second valve is controlled to be the first preset amount. If no (the conveying rate is not greater than the first preset rate), the opening amount of the first valve and the second valve is controlled to be 0.

[0056] In a preferred embodiment of the present invention, step S1 may further include: obtaining the angle between the nozzle of the blowing device and the strip 1, and controlling the angle to be 45-60 degrees. That is, the nozzles on the first blowing mechanism and the second blowing mechanism are both facing outwards from the strip 1, and both are at an angle of 45-60 degrees to the strip 1. It should be noted that when the angle is too large, it will cause liquid splashing and reduce the blowing effect; when the angle is too small, it will reduce the blowing pressure and reduce the liquid blowing efficiency. By setting the angle to 45-60 degrees, the present invention can maximize the blowing effect of residual rolling liquid on the edge of the strip.

[0057] In another preferred embodiment of the present invention, step S1 may further include: acquiring the current ambient temperature; when the ambient temperature is lower than a reference temperature, controlling the blowing temperature of the purging device to a first preset temperature; when the ambient temperature is not lower than the reference temperature, controlling the blowing temperature of the purging device to a second preset temperature; the second preset temperature being lower than the first preset temperature. The reference temperature can be 10-20℃, the second preset temperature can be 40-60℃, and the first preset temperature can be 80-100℃. It should be noted that at the reference temperature, if the blowing temperature is too low, the oil film on the strip surface will form slowly; if the blowing temperature is too high, the oil film will be damaged, increasing costs.

[0058] As an explanation of the preset nozzle spacing, since different strips 1 have different widths, the preset nozzle spacing can be equal to the width of the strip 1 minus the preset total sweeping distance. The preset total sweeping distance is equal to the sum of the sweeping distance of the first side and the sweeping distance of the second side; the sweeping distance of the first side and the sweeping distance of the second side can be the same.

[0059] Based on this, in step S1, the process of controlling the purging device to have a preset nozzle spacing in the horizontal direction includes:

[0060] The real-time nozzle spacing of the purging device in the horizontal direction is obtained. When the real-time nozzle spacing is less than the preset nozzle spacing, the first difference between the preset nozzle spacing and the real-time nozzle spacing is analyzed. Based on the first difference, the nozzles in the first purging mechanism and the second purging mechanism are controlled to move outward synchronously laterally to the preset nozzle spacing.

[0061] When the real-time nozzle spacing is greater than the preset nozzle spacing, a second difference between the real-time nozzle spacing and the preset nozzle spacing is analyzed, and the nozzles in the first and second purging mechanisms are controlled to move synchronously inward to the preset nozzle spacing based on the second difference. It should be noted that the strip steel 1 is typically conveyed along the middle of the purging device to facilitate the control and adjustment of the nozzle spacing.

[0062] It should be noted that in recent years, due to changes in market supply and demand, the demand for product quality has increased significantly. The surface quality of cold-rolled strip steel 1 has become a key factor affecting order volume, especially surface defects such as blemishes. This invention can effectively solve the problem of edge blemishes on the surface of strip steel 1, improve product surface quality, and enhance product competitiveness. After using this invention, the edge blemishes on strip steel 1 have been resolved.

[0063] See Figure 2 As shown, in order to provide a specific description of the purging device in this invention, in addition to the first air supply mechanism, the first purging mechanism, the second air supply mechanism, and the second purging mechanism, the purging device may also include a fixed pipe 2, a first screw 3, and a second screw 4.

[0064] The fixing tube 2 is fixedly installed above the strip steel 1. The fixing tube 2 has a first fixing end and a second fixing end arranged opposite to each other. The fixing tube 2 has an internal thread. The fixing tube 2 is perpendicular to the conveying direction of the strip steel 1. The strip steel 1 has a first side and a second side. Both the first side and the second side are parallel to the conveying direction of the strip steel 1.

[0065] The first screw 3 extends into the interior of the fixed tube 2 along the first fixed end, and the second screw 4 extends into the interior of the fixed tube 2 along the second fixed end; both the first screw 3 and the second screw 4 are threadedly connected to the fixed tube 2; a rocker arm is connected to the outer end of the first screw 3 and / or the second screw 4.

[0066] The first purging mechanism is arranged opposite to the second purging mechanism; the first purging mechanism includes a first flexible hose 5, a first rigid pipe 6, a first upper exhaust pipe 7, a first lower exhaust pipe 8, and a first transmission mechanism; the first flexible hose 5 is connected to the first air supply mechanism, specifically it can be simultaneously connected to the at least two first air supply ports to receive compressed air provided by the first air supply mechanism; the first rigid pipe 6 has an air inlet, an upper exhaust port, and a lower exhaust port, and the air inlet of the first rigid pipe 6 is connected to the first flexible hose 5; the upper exhaust port of the first rigid pipe 6 is connected to the first upper exhaust pipe 7, and the first upper exhaust pipe 7 is provided with a first upper nozzle 9, which is located above the strip 1 and obliquely downward toward the first side; the lower exhaust port of the first rigid pipe 6 is connected to the first lower exhaust pipe 8, and the first lower exhaust pipe 8 is provided with a first lower nozzle 10, which is located below the strip 1 and obliquely upward toward the first side; the first upper exhaust pipe 7 and the first lower exhaust pipe 8 are both arranged parallel to the conveying direction of the strip 1.

[0067] The first rigid pipe 6 includes a first upper horizontal pipe, a first vertical pipe, and a first lower horizontal pipe; the inner end of the first upper horizontal pipe is connected to the first upper exhaust pipe 7; the inner end of the first lower horizontal pipe is connected to the first lower exhaust pipe 8; the upper end of the first vertical pipe is connected to the outer end of the first upper exhaust pipe 7, and the lower end of the first vertical pipe is connected to the outer end of the first lower exhaust pipe 8. Both the first upper horizontal pipe and the first lower horizontal pipe are arranged parallel to the fixed pipe 2.

[0068] The first transmission mechanism includes a first sleeve 17 and a first driving member 18 that drives the first sleeve 17 to rotate. The driving force of the first driving member 18 can come from a servo motor. The first sleeve 17 has an internal thread and is sleeved on the outside of the first screw 3. The first sleeve 17 and the first screw 3 are threadedly connected. The first driving member 18 is fixedly connected to the first rigid tube 6. The first transmission mechanism also includes a first connecting rod. One end of the first connecting rod is fixedly connected to the first rigid tube 6, and the other end of the first connecting rod is fixedly connected to the first driving member 18. The first connecting rod is arranged parallel to the conveying direction of the strip steel 1.

[0069] The second purging mechanism includes a second flexible hose 11, a second rigid pipe 12, a second upper exhaust pipe 13, a second lower exhaust pipe 14, and a second transmission mechanism. The second flexible hose 11 is connected to the second air supply mechanism, specifically, it can be simultaneously connected to at least two second air supply ports to receive compressed air provided by the second air supply mechanism. The second rigid pipe 12 has an air inlet, an upper exhaust port, and a lower exhaust port. The air inlet of the second rigid pipe 12 is connected to the second flexible hose 11. The upper exhaust port of the second rigid pipe 12 is connected to the second upper exhaust pipe 13. The second upper exhaust pipe 13 is provided with a second upper nozzle 15, which is located above the strip 1 and angled downwards towards the second side. The lower exhaust port of the second rigid pipe 12 is connected to the second lower exhaust pipe 14. The second lower exhaust pipe 14 is provided with a second lower nozzle 16, which is located below the strip 1 and angled upwards towards the second side. Both the second upper exhaust pipe 13 and the first lower exhaust pipe 14 are parallel to the conveying direction of the strip 1.

[0070] The second rigid pipe 12 includes a second upper horizontal pipe, a second vertical pipe, and a second lower horizontal pipe; the inner end of the second upper horizontal pipe is connected to the second upper exhaust pipe 13; the inner end of the second lower horizontal pipe is connected to the second lower exhaust pipe 14; the upper end of the second vertical pipe is connected to the outer end of the second upper exhaust pipe 13, and the lower end of the second vertical pipe is connected to the outer end of the second lower exhaust pipe 14. Both the second upper horizontal pipe and the second lower horizontal pipe are parallel to the fixed pipe 2; the second connecting rod is parallel to the conveying direction of the strip steel 1.

[0071] The second transmission mechanism includes a second sleeve 19 and a second driving member 20 that drives the second sleeve 19 to rotate. The driving force of the second driving member 20 can come from a servo motor. The second sleeve 19 has an internal thread and is fitted onto the outside of the second screw 4. The second sleeve 19 and the second screw 4 are threadedly connected. The second driving member 20 is fixedly connected to the second rigid tube 12. The second transmission mechanism also includes a second connecting rod. One end of the second connecting rod is fixedly connected to the second rigid tube 12, and the other end of the second connecting rod is fixedly connected to the second driving member 20.

[0072] The residual liquid purging device at the edge of the strip 1 further includes a first limiting component and a second limiting component. The first limiting component is detachably and fixedly connected to the first screw 3, and the second limiting component is detachably and fixedly connected to the second screw 4. The first limiting component is used to fix and limit the first screw 3, and the second limiting component is used to fix and limit the second screw 4.

[0073] The design parameters of some components in the purging device are as follows: A rubber hose with an inner diameter of 50-120mm, a thickness of 2-3mm, and a length of approximately 3000mm is selected as the first hose 5 and the second hose 11; a stainless steel screw with a diameter of 30-40mm and a length of 2000-2400mm is selected as the first screw 3 and the second screw 4; a stainless steel nut with an inner diameter of 30-40mm, a thickness of 3-5mm, and a length of 800mm is selected as the fixing pipe 2; two servo motors with a power of 200-400W, including drivers; four L-shaped stainless steel pipes with an inner diameter of 20-30mm, a thickness of 1.5-3mm, and a length of 600-1000mm are selected to form the horizontal pipe and the exhaust pipe; 8-20 compressed air nozzles are installed on the four L-shaped stainless steel pipes. The nozzles adjust their position relative to the edge of the strip 1 according to the movement of the L-shaped stainless steel pipes to adapt to different strip widths and improve the removal effect of residual leveling liquid. Alternatively, the horizontal position of the nozzle can be adjusted according to the width of the strip 1 before purging, and the horizontal position of the nozzle can be left unchanged during the purging process.

[0074] In the specific implementation process, the blowing device sends instructions to the servo motor through the control system according to the width of the strip 1 given by the production system. The servo motor drives the side blowing pipe to automatically adjust the distance of the blowing nozzle according to the instructions. Then, the side blowing system automatically turns compressed air on / off for blowing according to the rolling speed of the strip 1 of the leveling machine.

[0075] The following are specific examples of the present invention:

[0076] Example 1

[0077] An order for automotive steel requires the following specifications: material DC04, thickness 1.2mm, width 1250mm, and surface free of defects such as roller marks, blemishes, and scratches.

[0078] Before production, the compressed air temperature is adjusted to 50℃ (the ambient temperature is about 22℃), the air supply pressure of both air supply mechanisms is adjusted to 4.5 bar, both air supply mechanisms have two air supply ports (corresponding to valves V1 and V2), and the angle between the nozzle and the strip is adjusted to 45 degrees.

[0079] After the steel coil Qxxxx is wound onto the leveling machine, because the width of the previous coil was 1500mm, the control system automatically adjusts the horizontal nozzle spacing to 1100mm. Before entering the purging device, the strip has residual leveling liquid on its edges.

[0080] When the rolling mill starts, valves V1 and V2 of the same air supply mechanism open, and the edge nozzles begin to form air knives, blowing away residual leveling fluid on the strip surface. When the strip speed reaches or exceeds 400 m / min, valve V2 closes because the purging effect does not deteriorate due to the increased relative speed. When the strip speed decreases to 400 m / min, valve V2 automatically opens. When the strip rolling is completed and the speed is 0 m / min, valves V1 and V2 automatically close.

[0081] After the steel coil Qxxxx came off the production line, it was stored for about 3 days before being uncoiled in the next rewinding process. The surface quality of the coil was good, and there were no blemishes or defects on the edges.

[0082] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A control method for reducing liquid residue on the edges of a strip, characterized in that, The method comprises the steps of: S1, controlling the blowing device to have a preset nozzle spacing in the horizontal direction; the preset nozzle spacing is smaller than the width of the strip steel; wherein the blowing device comprises a first gas supply mechanism, a first blowing mechanism, a second gas supply mechanism and a second blowing mechanism, the first gas supply mechanism supplies gas to the first blowing mechanism, and the second gas supply mechanism supplies gas to the second blowing mechanism; the first blowing mechanism is arranged close to the first side edge of the strip steel, and the second blowing mechanism is arranged close to the second side edge of the strip steel; the first blowing mechanism and the second blowing mechanism are both provided with nozzles above and below the strip steel; The first gas supply mechanism is communicated with the first blowing mechanism through at least two first gas supply ports, and each first gas supply port is provided with a first valve; the second gas supply mechanism is communicated with the second blowing mechanism through at least two second gas supply ports, and each second gas supply port is provided with a second valve; S2, controlling the first gas supply mechanism to supply gas to the first blowing mechanism, and controlling the second gas supply mechanism to supply gas to the second blowing mechanism; obtaining the conveying speed of the strip steel; when the conveying speed is greater than a first preset speed and less than a second preset speed, the opening amount of the first valve and the second valve is controlled to be a first preset amount; when the conveying speed is not less than the second preset speed, the opening amount of the first valve and the second valve is controlled to be a second preset amount; wherein the second preset speed is greater than the first preset speed, and the second preset amount is less than the first preset amount; the first preset speed is 0-3 m / min, and the second preset speed is 370-430 m / min; obtaining the current environmental temperature; when the environmental temperature is less than a reference temperature, the blowing temperature of the blowing device is controlled to be a first preset temperature; when the environmental temperature is not less than the reference temperature, the blowing temperature of the blowing device is controlled to be a second preset temperature; the second preset temperature is less than the first preset temperature; the reference temperature is 10-20℃, the second preset temperature is 40-60℃, and the first preset temperature is 80-100℃.

2. The control method of reducing liquid residue on the edge portion of a steel strip according to claim 1, characterized by, The gas supply pressure of the first gas supply mechanism and the second gas supply mechanism is 3-5 bar.

3. The control method of reducing liquid residue on the edge portion of a steel strip according to claim 1, characterized by, The first preset amount is an integer multiple of the second preset amount.

4. The control method of reducing liquid residue on the edge portion of a strip steel according to Claim 1, characterized by, The number of the first gas supply ports and the second gas supply ports is two.

5. The control method of reducing liquid residue on the edge portion of a steel strip according to Claim 1, characterized by, The step S1 further comprises: obtaining the included angle between the nozzles of the blowing device and the strip steel, and controlling the included angle to be 45-60 degrees.

6. The control method of reducing liquid residue on the edge portion of a strip steel according to any one of claims 1 to 5, characterized by, The preset nozzle spacing is equal to the width value of the strip steel minus a preset total blowing edge distance, and the preset total blowing edge distance is equal to the sum of the blowing edge distance of the first side edge and the blowing edge distance of the second side edge.

7. The control method of reducing liquid residue on the edge portion of a strip steel according to claim 6, characterized by, In the step S1, the process of controlling the blowing device to have a preset nozzle spacing in the horizontal direction comprises: Obtaining a real-time nozzle spacing of the blowing device in a horizontal direction, when the real-time nozzle spacing is less than the preset nozzle spacing, analyzing a first difference value of the preset nozzle spacing and the real-time nozzle spacing, and controlling the nozzles in the first blowing mechanism and the second blowing mechanism to move outward and laterally to have the preset nozzle spacing according to the first difference value; When the real-time nozzle spacing is greater than the preset nozzle spacing, a second difference value of the real-time nozzle spacing and the preset nozzle spacing is analyzed, and the nozzles in the first blowing mechanism and the second blowing mechanism are controlled to move inward and laterally to have the preset nozzle spacing according to the second difference value.

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