Method of reducing the incidence of muddying

Abstract

The application discloses a method for reducing the occurrence rate of oil sludge marks, and the method comprises the following steps: obtaining a value range of roller roughness; detecting the roller roughness to obtain a detected value of the roller roughness; and comparing the detected value of the roller roughness with the value range of the roller roughness to determine whether the roller needs to be replaced. The application can control the roller roughness and reduce the occurrence rate of oil sludge marks.

Description

Technical Field

[0001] This invention relates to the field of strip steel quality control technology, and in particular, to a method for reducing the occurrence of oil and mud stains. Background Technology

[0002] Roller marks are a common surface defect in strip steel, including mud marks, and have a significant impact on the surface quality of strip steel.

[0003] Oil mud marks mainly occur in the low-speed sections of the tinplate rolling process, such as the head and tail. Taking the tail as an example, residual emulsion on the strip surface easily adheres to the surfaces of rollers such as the dam roll, tension meter roll, and steering roll at the mill exit. Then, the emulsion on the roller surface is imprinted on the strip surface, forming oil mud marks. When the strip with oil mud marks is placed in the warehouse for a period of time, the moisture in the corresponding position of the oil mud marks decreases, and it becomes a solid that sticks to the surface of the strip, making it difficult to be washed off by the cleaning section. After being heated by the annealing unit, the oil mud marks react with the iron substrate, eventually forming oil mud mark defects.

[0004] To improve the surface quality of strip steel, it is necessary to treat the oil mud marks. Currently, the main methods are to wipe off the oil mud marks during the uncoiling inspection after the line is closed or to wipe the surface of the rollers after the machine is stopped. However, the above methods have the disadvantages of reducing production efficiency and being time-consuming and labor-intensive. Summary of the Invention

[0005] The embodiments of this application provide a method for reducing the occurrence rate of mud stains, which can reduce the occurrence rate of mud stains, reduce the frequency of downtime to wipe mud stains, and improve production efficiency.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a method for reducing the occurrence rate of mud stains is provided, comprising: Obtain the range of values ​​for the roller roughness; The roughness of the roller is detected, and the measured value of the roller roughness is obtained; Compare the measured value of the roller roughness with the range of roller roughness values ​​to determine whether the roller needs to be replaced.

[0008] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included: Obtain the range of values ​​for the roller blowing pressure; The blowing pressure of the roller is detected, and the detected value of the roller blowing pressure is obtained; Compare the detected value of the roller blowing pressure with the range of values ​​for the roller blowing pressure to determine whether the roller blowing pressure needs to be adjusted.

[0009] In some embodiments of this application, based on the foregoing scheme, the step of comparing the detected value of the roller blowing pressure with the range of values ​​for the roller blowing pressure to determine whether to adjust the roller blowing pressure includes: If the detected value of the roller blowing pressure is greater than the upper limit of the roller blowing pressure range, then reduce the roller blowing pressure; If the detected value of the roller blowing pressure is within the range of roller blowing pressure values, then the roller blowing pressure remains unchanged. If the detected value of the roller blowing pressure is less than the lower limit of the roller blowing pressure range, then increase the roller blowing pressure.

[0010] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included: Obtain the baseline and fluctuation values ​​of iron content in the emulsion; The range of iron content in the emulsion is determined based on the baseline and fluctuation values ​​of the iron content in the emulsion. The iron content of the emulsion was detected, and the detected value of the iron content of the emulsion was obtained; Compare the detected value of iron content in the emulsion with the range of values ​​for iron content in the emulsion to determine whether the iron content of the emulsion needs to be adjusted.

[0011] In some embodiments of this application, based on the foregoing scheme, determining the range of values ​​for the iron content of the emulsion according to the baseline value and fluctuation value of the iron content of the emulsion includes: The sum of the baseline and fluctuation values ​​of the iron content in the emulsion is calculated as the upper limit of the iron content in the emulsion. The difference between the baseline value and the fluctuation value of the iron content in the emulsion is calculated as the lower limit of the iron content in the emulsion. The range of values ​​for the iron content in the emulsion, from the lower limit to the upper limit, is the range of values ​​for the iron content in the emulsion.

[0012] In some embodiments of this application, based on the foregoing scheme, the step of comparing the detected value of the iron content in the emulsion with the range of values ​​for the iron content in the emulsion, and determining whether to adjust the iron content of the emulsion, includes: If the detected value of the iron content in the emulsion is greater than the upper limit of the iron content in the emulsion, then the iron content of the emulsion should be reduced. If the detected value of the iron content in the emulsion is within the range of the iron content in the emulsion, then the iron content in the emulsion remains unchanged. If the detected value of iron content in the emulsion is less than the lower limit of iron content in the emulsion, then the iron content of the emulsion should be increased.

[0013] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included: Obtain the range of values ​​for the emulsion injection pressure; The emulsion injection pressure is detected, and the detected value of the emulsion injection pressure is obtained; Compare the detected value of the emulsion injection pressure with the range of emulsion injection pressure values ​​to determine whether the emulsion injection pressure needs to be adjusted.

[0014] In some embodiments of this application, based on the foregoing scheme, the step of comparing the detected value of the emulsion injection pressure with the range of values ​​for the emulsion injection pressure to determine whether to adjust the emulsion injection pressure includes: If the detected value of the emulsion injection pressure is greater than the upper limit of the range of emulsion injection pressure values, then reduce the emulsion injection pressure. If the detected value of the emulsion injection pressure is within the range of emulsion injection pressure values, then the emulsion injection pressure remains unchanged. If the detected value of the emulsion injection pressure is less than the lower limit of the range of emulsion injection pressure values, then the emulsion injection pressure should be increased.

[0015] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included: Get the preset time; After the mill is detected to have stopped, the roller blowing equipment continues to work for a preset time before stopping.

[0016] In some embodiments of this application, on the one hand, the amount of emulsion residue on the roller surface is reduced by controlling the roller roughness and roller purging pressure; on the other hand, the iron content of the emulsion is controlled to prevent more emulsion from remaining on the roller surface through iron powder; on the other hand, the emulsion spraying pressure is controlled to prevent emulsion from splashing onto the roller surface or strip steel; and on the other hand, the rollers are continued to be purged when the mill is stopped to reduce the amount of emulsion on the roller surface. In summary, the occurrence rate of strip steel oil mud marks is reduced through multiple methods.

[0017] According to a second aspect of the embodiments of this application, an apparatus for reducing the occurrence rate of mud stains is provided, comprising: The acquisition unit acquires the range of values ​​for the roller roughness. The detection unit detects the roughness of the roller and obtains the detected value of the roller roughness. The comparison and judgment unit compares the detected value of the roller roughness with the range of roller roughness values ​​to determine whether the roller needs to be replaced.

[0018] The beneficial effects of the various embodiments of the second aspect described above can be referred to the beneficial effects of the first aspect and the various embodiments of the first aspect described above, and will not be repeated here.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart of a method for reducing the occurrence rate of sludge stains according to an embodiment of this application is shown; Figure 2 A schematic diagram of the emulsion circulation system in the embodiments of this application is provided; Figure 3 A schematic diagram of a rolling mill in an embodiment of this application is shown; Figure 4 A schematic diagram of the air purging nozzle and the emulsion nozzle in an embodiment of this application is shown; Figure 5 A block diagram of an apparatus for reducing the occurrence of mud stains according to an embodiment of this application is shown. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0022] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0023] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0024] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0025] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0027] Figure 1 A flowchart of a method for reducing the incidence of mud stains according to an embodiment of this application is shown. This method for reducing the incidence of mud stains can be performed by a device with computational processing capabilities.

[0028] Reference Figure 1 As shown, the method for reducing the occurrence rate of sludge marks includes at least steps S1 to S3, which are described in detail below: In step S1, the range of values ​​for the roller roughness is obtained.

[0029] In this application, the roughness ranges of different rollers can be different or the same. For example, the roughness range of the dam roller can be greater than that of the tension meter roller, or both the Ra roughness of the dam roller and the Ra roughness of the tension meter roller can be less than 3.0 μm. The roughness ranges of different rollers can also be obtained by detecting the residual amount of emulsion. For example, a standard residual amount of emulsion is set, and emulsion is sprayed onto the surface of rollers with different roughnesses. The residual amount of emulsion on the roller surface is detected after a unit time. When the detected residual amount of emulsion is less than or equal to the standard residual amount of emulsion, it indicates that the roughness of the corresponding roller meets the requirements. The roughness range of the roller can be determined based on the roughness of the corresponding roller.

[0030] In step S2, the roughness of the roller is detected to obtain the detected value of the roller roughness.

[0031] In this application, a standard time can be set, and the mill can be stopped after the standard working time to detect the roll roughness. Alternatively, the roll roughness can be detected during the mill shutdown for maintenance.

[0032] In step S3, the detected value of the roller roughness is compared with the range of roller roughness values ​​to determine whether the roller needs to be replaced.

[0033] In this application, since the higher the roughness of the roller, the easier it is for the emulsion to remain on the roller surface, when the detected value of the roller roughness is greater than the upper limit of the roller roughness range, the roller needs to be replaced. When the detected value of the roller roughness is within the roller roughness range or less than the lower limit of the roller roughness range, the roller may or may not be replaced depending on actual needs. For example, if the roller can perform the corresponding function, the roller will not be replaced; if it cannot perform the corresponding function, the roller will be replaced.

[0034] In this embodiment, the occurrence rate of oily mud stains can also be reduced by controlling the roller blowing pressure, as detailed below: Obtain the range of values ​​for the roller blowing pressure; The blowing pressure of the roller is detected, and the detected value of the roller blowing pressure is obtained; Compare the detected value of the roller blowing pressure with the range of values ​​for the roller blowing pressure to determine whether the roller blowing pressure needs to be adjusted.

[0035] Specifically, if the detected value of the roller blowing pressure is greater than the upper limit of the roller blowing pressure range, the roller blowing pressure is reduced; if the detected value of the roller blowing pressure is within the roller blowing pressure range, the roller blowing pressure remains unchanged; if the detected value of the roller blowing pressure is less than the upper limit of the roller blowing pressure range, the roller blowing pressure is increased.

[0036] In this application, the roller blowing pressure can be the pressure of compressed air blown onto the roller surface, and can be carried out using the blowing pipe of the roller blowing equipment. The blowing direction of the blowing pipe can be distributed along the roller axis. The roller blowing pressure can be detected by a pressure sensor or by the pressure detection mechanism built into the roller blowing equipment.

[0037] If the roller blowing pressure is too high, the emulsion on the roller surface will easily splash onto the strip. If the roller blowing pressure is too low, more emulsion will remain on the roller surface. Therefore, it is necessary to configure a moderate and stable roller blowing pressure to facilitate the removal of emulsion from the roller surface while preventing more emulsion from splashing onto the strip.

[0038] In this embodiment, the iron content of the emulsion can also be controlled to reduce the occurrence rate of oil and mud stains on the strip, as detailed below: Obtain the baseline and fluctuation values ​​of iron content in the emulsion; The range of iron content in the emulsion is determined based on the baseline and fluctuation values ​​of the iron content in the emulsion. The iron content of the emulsion was detected, and the detected value of the iron content of the emulsion was obtained; Compare the detected value of iron content in the emulsion with the range of values ​​for iron content in the emulsion to determine whether the iron content of the emulsion needs to be adjusted.

[0039] Specifically, the sum of the baseline value and the fluctuation value of the iron content in the emulsion is calculated as the upper limit value of the iron content in the emulsion; the difference between the baseline value and the fluctuation value of the iron content in the emulsion is calculated as the lower limit value of the iron content in the emulsion; the numerical range from the lower limit value to the upper limit value of the iron content in the emulsion is the range of values ​​for the iron content in the emulsion.

[0040] If the detected value of the iron content in the emulsion is greater than the upper limit of the iron content in the emulsion, the iron content of the emulsion is reduced; if the detected value of the iron content in the emulsion is within the range of the iron content in the emulsion, the iron content of the emulsion remains unchanged; if the detected value of the iron content in the emulsion is less than the lower limit of the iron content in the emulsion, the iron content of the emulsion is increased.

[0041] See Figure 2 , Figure 2 A schematic diagram of the emulsion circulation system is provided. The emulsion tank supplies emulsion to the injection valve station via a pump. The injection valve station sprays the emulsion onto the rolling mill. The emulsion recovered on the rolling mill enters the return tank. The return tank sends the recovered emulsion to the vacuum filter via a pump. Then, it passes through a magnetic filter to filter out iron powder from the emulsion. The filtered emulsion is returned to the emulsion tank. The iron content of the emulsion can be adjusted by increasing or decreasing the emulsion supply speed, i.e., increasing or decreasing the speed at which the emulsion tank supplies emulsion to the injection valve station via the pump, or by adjusting the frequency of magnetic filtration. For example, if the detected value of the emulsion iron content is higher than the upper limit of the emulsion iron content, the frequency of magnetic filtration is increased; if the detected value is lower than the lower limit of the emulsion iron content, the frequency of magnetic filtration is decreased; if the detected value is within the range of the emulsion iron content, the frequency of magnetic filtration remains unchanged.

[0042] In this embodiment, the incidence of sludge marks can also be reduced by controlling the emulsion spray pressure, as detailed below: Obtain the range of values ​​for the emulsion injection pressure; The emulsion injection pressure is detected, and the detected value of the emulsion injection pressure is obtained; Compare the detected value of the emulsion injection pressure with the range of emulsion injection pressure values ​​to determine whether the emulsion injection pressure needs to be adjusted.

[0043] Specifically, if the detected value of the emulsion injection pressure is greater than the upper limit of the range of emulsion injection pressure, the emulsion injection pressure is reduced; if the detected value of the emulsion injection pressure is within the range of emulsion injection pressure, the emulsion injection pressure remains unchanged; if the detected value of the emulsion injection pressure is less than the lower limit of the range of emulsion injection pressure, the emulsion injection pressure is increased.

[0044] In this application, the emulsion injection pressure can be adjusted using a pressure regulating valve.

[0045] Table 1

[0046] See Figure 3 and Figure 4 , Figure 3 A schematic diagram of a rolling mill in an embodiment of this application is shown. Figure 4 The diagram shows an air purging nozzle and an emulsion nozzle in an embodiment of this application. The air purging nozzle blows compressed air onto the surface of the roll or the rolling mill components, and the emulsion nozzle sprays emulsion onto the rolling mill. The setting of the purging pressure can be found in Table 1. The control requirements are the range of values ​​for the emulsion spray pressure at the corresponding position. In Table 1, the upper surface refers to the upper surface of the strip and the lower surface refers to the lower surface of the strip.

[0047] In this embodiment of the application, the purging time can also be extended to reduce the occurrence rate of sludge marks, as detailed below: Get the preset time; After the mill is detected to have stopped, the roller blowing equipment continues to work for a preset time before stopping.

[0048] The preset time can be set according to the actual situation, such as 10 minutes. The roller blowing equipment can use air blowing nozzles to blow the mill, reducing the amount of emulsion residue on the strip surface during shutdown.

[0049] In summary, the embodiments of this application reduce the amount of emulsion residue on the roller surface by controlling the roller roughness and roller purging pressure, control the iron content of the emulsion to prevent more emulsion from remaining on the roller surface through iron powder, control the emulsion spraying pressure to prevent emulsion from splashing onto the roller surface or strip steel, and continue to purge the rollers when the mill is stopped to reduce the amount of emulsion on the roller surface. Thus, the occurrence rate of strip steel oil mud marks is reduced in multiple ways.

[0050] After adopting this application, the amount of waste and defective products caused by mud stains is greatly reduced, improving the surface quality of strip steel from 30 tons / month to 5 tons / month; the frequency of roller wiping caused by mud stain defects is greatly reduced, avoiding shutdowns caused by such defects, and the frequency of roller wiping is reduced from 2-3 times / day to 0.5 times / day, reducing the safety risks caused by roller wiping.

[0051] Figure 5 A block diagram of an apparatus for reducing the occurrence of mud stains according to an embodiment of this application is shown.

[0052] like Figure 5 As shown, based on the same inventive concept, the second aspect of this application also provides an apparatus 100 for reducing the occurrence rate of mud stains, comprising: Unit 101 is used to obtain the range of values ​​for the roller roughness. The detection unit 102 detects the roughness of the roller and obtains the detected value of the roller roughness. The comparison and judgment unit 103 compares the detected value of the roller roughness with the range of roller roughness values ​​to determine whether the roller needs to be replaced.

[0053] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0054] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for reducing the incidence of oily mud stains, characterized in that, include: The range of values ​​for roller roughness is obtained; wherein, obtaining the range of values ​​for roller roughness includes: spraying emulsion onto the roller surface, detecting the amount of emulsion residue on the roller surface after a unit time, and when the detected amount of emulsion residue is less than or equal to the standard amount of emulsion residue, determining the range of values ​​for roller roughness based on the roughness of the corresponding roller. The roughness of the roller is detected, and the measured value of the roller roughness is obtained; The roller roughness is compared with the detected value and the range of roller roughness values ​​to determine whether the roller needs to be replaced. The determination of whether the roller needs to be replaced includes: when the detected value of roller roughness is greater than the upper limit of the range of roller roughness values, it is determined that the roller needs to be replaced.

2. The method according to claim 1, characterized in that, Also includes: Obtain the range of values ​​for the roller blowing pressure; The blowing pressure of the roller is detected, and the detected value of the roller blowing pressure is obtained; Compare the detected value of the roller blowing pressure with the range of values ​​for the roller blowing pressure to determine whether the roller blowing pressure needs to be adjusted.

3. The method according to claim 2, characterized in that, The step of comparing the detected value of the roller blowing pressure with the range of roller blowing pressure values ​​to determine whether to adjust the roller blowing pressure includes: If the detected value of the roller blowing pressure is greater than the upper limit of the roller blowing pressure range, then reduce the roller blowing pressure; If the detected value of the roller blowing pressure is within the range of roller blowing pressure values, then the roller blowing pressure remains unchanged. If the detected value of the roller blowing pressure is less than the lower limit of the roller blowing pressure range, then increase the roller blowing pressure.

4. The method according to claim 1, characterized in that, Also includes: Obtain the baseline and fluctuation values ​​of iron content in the emulsion; The range of iron content in the emulsion is determined based on the baseline and fluctuation values ​​of the iron content in the emulsion. The iron content of the emulsion was detected, and the detected value of the iron content of the emulsion was obtained; Compare the detected value of iron content in the emulsion with the range of values ​​for iron content in the emulsion to determine whether the iron content of the emulsion needs to be adjusted.

5. The method according to claim 4, characterized in that, The determination of the range of iron content in the emulsion based on the baseline and fluctuation values ​​includes: The sum of the baseline and fluctuation values ​​of the iron content in the emulsion is calculated as the upper limit of the iron content in the emulsion. The difference between the baseline value and the fluctuation value of the iron content in the emulsion is calculated as the lower limit of the iron content in the emulsion. The range of values ​​for the iron content in the emulsion, from the lower limit to the upper limit, is the range of values ​​for the iron content in the emulsion.

6. The method according to claim 4, characterized in that, The step of comparing the detected value of the iron content in the emulsion with the range of values ​​for the iron content in the emulsion, and determining whether to adjust the iron content of the emulsion, includes: If the detected value of the iron content in the emulsion is greater than the upper limit of the iron content in the emulsion, then the iron content of the emulsion should be reduced. If the detected value of the iron content in the emulsion is within the range of the iron content in the emulsion, then the iron content in the emulsion remains unchanged. If the detected value of iron content in the emulsion is less than the lower limit of iron content in the emulsion, then the iron content of the emulsion should be increased.

7. The method according to claim 1, characterized in that, Also includes: Obtain the range of values ​​for the emulsion injection pressure; The emulsion injection pressure is detected, and the detected value of the emulsion injection pressure is obtained; Compare the detected value of the emulsion injection pressure with the range of emulsion injection pressure values ​​to determine whether the emulsion injection pressure needs to be adjusted.

8. The method according to claim 7, characterized in that, The step of comparing the detected value of the emulsion injection pressure with the range of values ​​for the emulsion injection pressure to determine whether to adjust the emulsion injection pressure includes: If the detected value of the emulsion injection pressure is greater than the upper limit of the range of emulsion injection pressure values, then reduce the emulsion injection pressure. If the detected value of the emulsion injection pressure is within the range of emulsion injection pressure values, then the emulsion injection pressure remains unchanged. If the detected value of the emulsion injection pressure is less than the lower limit of the range of emulsion injection pressure values, then the emulsion injection pressure should be increased.

9. The method according to claim 1, characterized in that, Also includes: Get the preset time; After the mill is detected to have stopped, the roller blowing equipment continues to work for a preset time before stopping.

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