Control method for a levelling device

Abstract

Embodiments of the present application provide a control method of a leveling device, the leveling device comprising a leveler, a spraying device and a blowing device, the leveler comprising a rack and a roller, the method comprising: when a roll changing preparation signal for the leveling device is triggered, reducing a nozzle pressure of the spraying device; when a roll changing signal for the leveler is acquired, switching the leveler from an automatic working state to a closed state; when a roll changing completion signal for the leveler is triggered, keeping the blowing device in an open state for a first time length; when a roll changing completion signal for the leveling device is acquired, keeping the blowing device in the open state for a second time length, and restoring the nozzle pressure of the spraying device after the second time length. The technical solution of the present application can realize control of the leveling device according to different signals, reduce the generation of surface indentation of the strip during production, and improve the quality of the strip.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device control, in particular to a control method of a skin pass mill. BACKGROUND

[0002] Skin pass rolling is the key to strip production. The performance and quality of the strip are improved after the strip is rolled by the skin pass mill. However, if there are foreign matters on the roll of the skin pass mill, the foreign matters will leave marks on the strip, i.e. the strip surface will be pressed, which will seriously affect the quality of the strip.

[0003] The traditional control method of the skin pass mill cannot effectively avoid the situation that there are foreign matters on the roll of the skin pass mill. The number of replacing the roll has to be increased to ensure the quality of the produced strip, which not only wastes the roll resources, but also affects the continuous production process of the strip and causes production accidents.

[0004] Therefore, how to effectively avoid the foreign matters on the roll of the skin pass mill and improve the quality of the strip is a technical problem to be solved. SUMMARY

[0005] The control method of the skin pass mill provided by the embodiments of the present application can control the skin pass mill according to different signals, reduce the generation of the pressed marks on the surface of the strip in the production process, and improve the quality of the strip.

[0006] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present application.

[0007] According to an aspect of the embodiments of the present application, a control method of a skin pass mill is provided. The skin pass mill includes a skin pass mill, a spraying device and a blowing device. The skin pass mill is used to process a strip to improve the performance of the strip. The skin pass mill includes a rack and a roll. The spraying device is used to clean the strip and assist the processing of the strip. The blowing device is used to dry the strip. The method includes: when a roll changing preparation signal for the skin pass mill is triggered, reducing the nozzle pressure of the spraying device; when a roll changing signal for the skin pass mill is acquired, switching the skin pass mill from an automatic working state to a closed state; when a roll changing completion signal for the skin pass mill is triggered, keeping the blowing device in an open state for a first time length; and when a roll changing completion signal for the skin pass mill is acquired, keeping the blowing device in the open state for a second time length and restoring the nozzle pressure of the spraying device after the second time length.

[0008] In some embodiments of the present application, based on the foregoing scheme, the trigger of the roll change preparation signal for the leveling device comprises: triggering the roll change preparation signal for the leveling device when preparing to stop the previous strip of the leveling mill roll.

[0009] In some embodiments of the present application, based on the foregoing scheme, the acquisition of the roll change completion signal for the leveling device comprises: acquiring the roll change completion signal for the leveling device when the leveling mill housing is closed.

[0010] In some embodiments of the present application, based on the foregoing scheme, the lowering of the nozzle pressure of the spraying device when the roll change preparation signal for the leveling device is triggered comprises: determining a second pressure value of the nozzle pressure of the spraying device according to the strip specifications when the roll change preparation signal for the leveling device is triggered; lowering the nozzle pressure of the spraying device from a first pressure value to the second pressure value; wherein the nozzle pressure value of the spraying device in the automatic working state of the leveling device is the first pressure value.

[0011] In some embodiments of the present application, based on the foregoing scheme, the method further comprises: determining a to-be-depressed area of the spraying device according to the specifications of the leveling mill when the roll change signal for the leveling mill is acquired; keeping the nozzles in the to-be-depressed area in an open state and the pressure of the nozzles being the second pressure value.

[0012] In some embodiments of the present application, based on the foregoing scheme, the method further comprises: keeping the purging device in an open state for a second length of time when the roll change completion signal for the leveling device is acquired, and raising the nozzle pressure in the to-be-depressed area from the second pressure value to the first pressure value after the second length of time, while opening the remaining nozzles and the pressure of the nozzles being the first pressure value.

[0013] In some embodiments of the present application, based on the foregoing scheme, the keeping of the purging device in an open state for a first length of time when the roll change completion signal for the leveling mill is triggered comprises: determining a first length of time according to the speed of processing the strip when the roll change completion signal for the leveling mill is triggered; keeping the purging device in an open state for the first length of time.

[0014] In some embodiments of the present application, based on the foregoing scheme, the maintaining the purging device in the open state for the second length of time upon obtaining the roll change completion signal for the temper mill comprises: determining the second length of time according to the speed of processing the strip steel upon obtaining the roll change completion signal for the temper mill; and maintaining the purging device in the open state for the second length of time.

[0015] In some embodiments of the present application, based on the foregoing scheme, the method further comprises: switching the temper mill from the closed state to the automatic working state after the second length of time upon obtaining the roll change completion signal for the temper mill.

[0016] In some embodiments of the present application, based on the foregoing scheme, the method further comprises: switching the purging device to the automatic working state after the temper mill is switched from the closed state to the automatic working state.

[0017] In some embodiments of the present application, according to different signals, the control of the temper mill is realized, the situation of adhering of pollution foreign matters to the roll of the temper mill is reduced, the pollution foreign matters that are not cleaned on the roll of the temper mill are effectively avoided, the generation of the surface indentation of the strip steel in the production process is reduced, the quality of the strip steel is improved, the frequency of replacing the roll is reduced, the roll resources are saved, and the production of the strip steel is smoothly carried out.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0020] Figure 1 A flow chart of a control method of a temper mill is shown according to an embodiment of the present application.

[0021] Figure 2 An interface diagram of an implementation device applying an embodiment of the present application is shown.

[0022] Figure 3 An interface diagram of an implementation device applying another embodiment of the present application is shown.

[0023] Figure 4 An interface diagram of an implementation device applying another embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0025] Moreover, described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, herein, to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the technology can be practiced without one or more of the

[0026] The flow charts shown in the drawings are merely examples and do not necessarily include all of the content and operations / steps, nor are they necessarily performed in the order described. For example, some operations / steps can be further broken down, and some operations / steps can be combined or partially combined, so the actual order of execution can be changed according to actual conditions.

[0027] It should be noted that the terms "first", "second", and the like, in the description and in the claims of the present application and above-described drawings, are used only for distinguishing between similar objects and do not necessarily have to imply a specific order or sequence. It is to be understood that the objects, which are thus described, can be interchanged, where appropriate, so that the embodiments of the present application described herein can be carried out in other sequences than those described or illustrated herein.

[0028] It should be noted that the technology of the present application is applied to a cold skin pass rolling process, in which the rolling of a skin pass mill requires a skin pass liquid for cleaning and lubrication, so in the rolling process, mixed contaminant foreign matters of the skin pass liquid, iron powder and desalted water, etc. in the working environment are easily adhered to the roll of the skin pass mill, and are difficult to handle, and these contaminant foreign matters will also be rolled with the roll, leaving marks, i.e. indentations, on the surface of the strip steel. The batch production of indentations has a serious impact on the quality of the strip steel.

[0029] In the present application, the skin pass equipment includes a skin pass mill, a spraying device and a blowing device, the skin pass mill is used for processing the strip steel to improve the performance of the strip steel, the skin pass mill includes a rack and a roll, the spraying device is used for cleaning the strip steel and assisting the processing of the strip steel, the spraying device can be filled with a skin pass liquid, and the blowing device is used for drying the strip steel.

[0030] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0031] Figure 1 A flowchart is shown of a control method for a leveling device according to an embodiment of this application. The control method for the leveling device can be executed by a device with computational processing capabilities.

[0032] Reference Figure 1 As shown, the control method for the leveling equipment includes at least steps 101 to 104, which are described in detail below:

[0033] In step 101, when a roll change preparation signal for the leveling equipment is triggered, the nozzle pressure of the spraying device is reduced.

[0034] In this application, triggering the roll change preparation signal for the leveling equipment includes: triggering the roll change preparation signal for the leveling equipment when the previous coil of strip steel is rolled in preparation for changing the rolls of the leveling machine.

[0035] In one embodiment of this application, reducing the nozzle pressure of the spraying device when a roll change preparation signal for the leveling equipment is triggered can be performed according to the following steps 1011 to 1012:

[0036] Step 1011: When the roll change preparation signal for the leveling equipment is triggered, the second pressure value of the nozzle pressure of the spraying device is determined according to the strip specifications.

[0037] Step 1012: Reduce the nozzle pressure of the spraying device from a first pressure value to a second pressure value. Wherein, the nozzle pressure of the spraying device when the leveling equipment is in automatic operation is the first pressure value.

[0038] In one embodiment of this application, when preparing to replace the leveling mill rolls, the second pressure value of the spray device nozzle is determined to be 0.5 bar based on the specifications of the strip being rolled at that time, and the nozzle pressure of the spray device can be reduced from the first pressure value to the second pressure value. Wherein, when the leveling equipment is in automatic operation, the nozzle pressure value of the spray device is the first pressure value, which can be either 0.8 bar or 1.0 bar.

[0039] Under the first pressure value of 0.8 to 1.0 bar, the normal rolling of the strip can be maintained; under the second pressure value of 0.5 bar, the normal rolling of the strip can be maintained to the maximum extent and to prepare for the subsequent roll changing process of the leveling mill.

[0040] Continue to refer to Figure 1In step 102, when a roll changing signal of the skin pass mill is acquired, the skin pass mill is switched from an automatic working state to a closed state.

[0041] In the present application, when a roll changing signal of the skin pass mill is acquired, the following steps are further included: determining a to-be-decreased-pressure area of the spraying device according to the specification of the skin pass mill; keeping the nozzles in the to-be-decreased-pressure area in an open state and the pressure of the nozzles being the second pressure value.

[0042] In an implementation scenario of the present application, when the skin pass mill is ready to change the roll, the skin pass mill can be switched from an automatic working state to a closed state, and a to-be-decreased-pressure area of the spraying device can be determined according to the specification of the skin pass mill. For example, a wet skin pass 1 area and a center area near the center line of the skin pass mill can be set as the to-be-decreased-pressure area. Then, the nozzles in the to-be-decreased-pressure area are kept in an open state and the pressure of the nozzles is kept at the second pressure value 0.5 bar.

[0043] At the second pressure value 0.5 bar, the spraying device can be kept in a low-pressure flow state, preventing the skin pass liquid inside the spraying device from freezing and clogging the nozzles. In addition, the skin pass liquid can keep the environment of the skin pass mill clean and reduce the probability of foreign matters adhering to the roll of the skin pass mill.

[0044] Continuing to refer to Figure 1 In step 103, when a roll changing completion signal of the skin pass mill is triggered, the purging device is kept in an open state for a first time length.

[0045] In an embodiment of the present application, when the roll changing completion signal of the skin pass mill is triggered, the purging device is kept in an open state for a first time length, which can be performed according to the following steps 1031 to 1032:

[0046] Step 1031, when the roll changing completion signal of the skin pass mill is triggered, a first time length is determined according to the speed of processing the strip.

[0047] Step 1032, the purging device is kept in an open state for the first time length.

[0048] In an implementation scenario of the present application, when the roll changing of the skin pass mill is completed, the first time length can be determined as 20 s according to the speed of processing the strip (i.e. the speed of the strip production line and the time required for each process in the strip production), and the purging device is kept in an open state for the first time length.

[0049] In the first time length of 20s, the strip steel production line can be ensured to be in normal production, and the environment of the temper mill can be kept clean through the blowing effect, so as to reduce the probability of the pollution foreign matters adhering to the roll of the temper mill.

[0050] With reference to the above description Figure 1 In step 104, when the roll changing completion signal of the tempering equipment is acquired, the blowing device is kept in the open state for a second time length, and the nozzle pressure of the spraying device is restored after the second time length.

[0051] In the present application, the roll changing completion signal of the tempering equipment is acquired when the temper mill housing is closed.

[0052] In an embodiment of the present application, when the roll changing completion signal of the tempering equipment is acquired, the blowing device is kept in the open state for a second time length, which can be performed according to the following steps 1041 to 1042:

[0053] Step 1041, when the roll changing completion signal of the tempering equipment is acquired, the second time length is determined according to the speed of processing the strip steel.

[0054] Step 1042, the blowing device is kept in the open state for the second time length.

[0055] In an embodiment of the present application, when the temper mill housing is closed, the second time length can be determined according to the speed of processing the strip steel (i.e. the speed of the strip steel production line at this time and the time required for each process in the strip steel production), which is 10s, and the blowing device is kept in the open state for the second time length. In the second time length of 10s, the strip steel production line can be ensured to be in normal production, and the environment of the temper mill can be kept clean through the blowing effect, so as to reduce the probability of the pollution foreign matters adhering to the roll of the temper mill.

[0056] In another embodiment of the present application, the nozzle pressure of the spraying device is restored after the second time length, which includes that the nozzle pressure in the pressure reduction area is raised from the second pressure value to the first pressure value after the second time length, while the remaining nozzles are opened, and the pressure of the nozzles is the first pressure value. It also includes that after the second time length of acquiring the roll changing completion signal of the tempering equipment, the temper mill is switched from the closed state to the automatic working state, and after the temper mill is switched from the closed state to the automatic working state, the blowing device is switched to the automatic working state.

[0057] In another implementation scenario of the present application, the spraying device is switched to the automatic working state after the closing of the leveller stand and the blowing device is kept open for 10s, at this time the nozzle pressure in the pressure reduction area is raised from the second pressure value 0.5 to the first pressure value 1.0, while the rest of the nozzles are open and the pressure of the nozzles is the first pressure value 1.0. The leveller is switched from the closed state to the automatic working state, and after the leveller is switched from the closed state to the automatic working state, the blowing device is also switched to the automatic working state.

[0058] In the technical solution provided in some embodiments of the present application, the control of the levelling device is realized according to different signals, the nozzle pressure of the spraying device is reduced when the roll changing preparation signal for the levelling device is triggered, the leveller is switched from the automatic working state to the closed state when the roll changing signal for the leveller is obtained, the blowing device is kept in the open state for a first time length when the roll changing completion signal for the leveller is triggered, the blowing device is kept in the open state for a second time length when the roll changing completion signal for the levelling device is obtained, and the nozzle pressure of the spraying device is restored after the second time length. Not only can the probability of the contamination adhering to the leveller roll be greatly reduced, the contamination not cleaned on the leveller roll can be effectively avoided, the generation of the surface indentation of the strip during the production process can be reduced, the quality of the strip can be improved, but also the number of roll replacement can be reduced, the strip production can be smoothly carried out, the roll resources can be saved, and the production cost can be reduced.

[0059] In order for those skilled in the art to better understand the progressiveness of the technical solution of the present application, the following will be combined with Figures 2 to 4 The implementation process of the technical solution of the present application is demonstrated.

[0060] Figure 2 An implementation device interface graph applying one embodiment of the present application is shown.

[0061] As Figure 2 The interface applying one embodiment of the present application is shown in the spraying device of the levelling device, as Figure 2 The value circled in the figure is the nozzle pressure of the spraying device, the value can be adjusted to 0.6 to reduce the nozzle pressure of the spraying device when the roll changing preparation signal for the levelling device is triggered. The value can also be adjusted to 1.0 to restore the nozzle pressure of the spraying device after the second time length when the roll changing completion signal for the levelling device is obtained.

[0062] Figure 3 An implementation device interface graph applying another embodiment of the present application is shown.

[0063] As Figure 3 shown is an implementation device interface diagram applying an embodiment of the present application, which is applied in a spraying device of a planarization equipment. As Figure 3 shown in the table, the nozzles of the spraying device in the planarization machine are divided into Center, Zone1, Zone2 and Zone3 areas according to positions. Among them, Zone1 and center can be selected as the to-be-reduced-pressure areas, so as to keep the nozzles in the to-be-reduced-pressure areas in an open state and the pressure of the nozzles as the second pressure value when the roll change signal for the planarization machine is acquired.

[0064] Figure 4 shown is an implementation device interface diagram applying another embodiment of the present application.

[0065] As Figure 4 shown is an implementation device interface diagram applying an embodiment of the present application, which is applied in a blowing device of a planarization equipment. As Figure 4 shown in the table, the first time length can be set in advance, and when Blow off 2 is switched to ON, the blowing device can be kept in an open state for the first time length when the roll change completion signal for the planarization machine is triggered.

[0066] With reference to Figure 4 , the second time length can also be set in advance, and when Blow off 3 is switched to ON, the blowing device can be kept in an open state for the second time length when the roll change completion signal for the planarization machine is triggered.

[0067] With reference to Figure 4 , when switched to Auto, the blowing device can be switched to an automatic working state after the planarization machine is switched to the automatic working state from a closed state.

[0068] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. The present application is intended to cover any and all variations of the present application comprising adaptations, modifications and equivalents of the methods and materials disclosed in the foregoing description and accompanying drawings. It is intended that the scope of the application be defined by the claims appended hereto.

[0069] It is to be understood that the application is not limited to the precise construction described and shown in the drawings and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims appended hereto.

Claims

1. A control method for a leveling device, the leveling device comprising a leveling machine, a spraying device, and a blowing device, the leveling machine being used to process strip steel to improve its properties, the leveling machine including a frame and rolls, the spraying device for cleaning the strip steel and facilitating its processing, and the blowing device for drying the strip steel, characterized in that... The method includes: When the roll change preparation signal for the leveling equipment is triggered, the nozzle pressure of the spraying device is reduced; When a roll change signal is received for the leveling machine, the leveling machine is switched from automatic operation to shutdown. When the roll change completion signal for the leveling machine is triggered, the purging device remains in the on state for a first time period. When a roller change completion signal is received for the leveling equipment, the purging device is kept in the open state for a second time period, and the nozzle pressure of the spraying device is restored after the second time period.

2. The method according to claim 1, characterized in that, The triggering of the roll change preparation signal for the leveling equipment includes: When preparing to change the rolls of the leveling mill, a roll change preparation signal is triggered for the leveling equipment during the rolling of the previous coil of strip.

3. The method according to claim 1, characterized in that, The acquisition of the roller change completion signal for the leveling equipment includes: When the leveling machine frame is closed, a roll change completion signal for the leveling equipment is obtained.

4. The method according to claim 1, characterized in that, The step of reducing the nozzle pressure of the spraying device when triggering a roller change preparation signal for the leveling equipment includes: When the roll change preparation signal for the leveling equipment is triggered, the second pressure value of the nozzle pressure of the spraying device is determined according to the strip specifications. The nozzle pressure of the spray device is reduced from the first pressure value to the second pressure value; Wherein, the nozzle pressure value of the spraying device when the leveling equipment is in automatic working state is the first pressure value.

5. The method according to claim 4, characterized in that, The method further includes: Upon receiving a roller change signal for the leveling machine, the pressure reduction zone of the spraying device is determined according to the specifications of the leveling machine. Keep the nozzle in the pressure reduction area open and the pressure of the nozzle is the second pressure value.

6. The method according to claim 5, characterized in that, The method further includes: When a roll change completion signal is received for the leveling equipment, the purging device is kept in the open state for the second time period, and after the second time period, the nozzle pressure in the pressure-reducing area is increased from the second pressure value to the first pressure value, while the remaining nozzles are opened, and the pressure of the nozzles is the first pressure value.

7. The method according to claim 1, characterized in that, When the roll change completion signal for the leveling machine is triggered, keeping the purging device in the on state for a first time period includes: When the roll change completion signal for the leveling machine is triggered, the first time length is determined based on the speed at which the strip is processed. The purging device is kept in the on state for the first time period.

8. The method according to claim 1, characterized in that, When a roll change completion signal for the leveling equipment is received, keeping the purging device in the on state for a second time period includes: Upon receiving a roll change completion signal for the leveling equipment, a second time length is determined based on the processing speed of the strip. The purging device is kept in the on state for the second time period.

9. The method according to claim 1, characterized in that, The method further includes: After obtaining the second time length of the roll change completion signal for the leveling equipment, the leveling machine is switched from the off state to the automatic working state.

10. The method according to claim 9, characterized in that, The method further includes: After the leveling machine switches from the off state to the automatic working state, the purging device is switched to the automatic working state.

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