A rolling mill magnetic scale protection device and control method thereof

Abstract

The present application provides a rolling mill magnetic scale protection device and a control method thereof, in which a protective cover is installed on the outer side of a magnetic scale on a hydraulic cylinder, a sealing ring is provided at one end of the protective cover connected to the hydraulic cylinder, a through hole is provided at the other end of the protective cover, a sealing gasket is provided in the through hole, and the magnetic scale cable passes through the through hole. The protective cover is tightly connected to the hydraulic cylinder to isolate the magnetic scale from the working environment. An air hole is provided on the protective cover, and a positive pressure air source delivers compressed gas into the protective cover through the air hole to maintain positive air pressure in the protective cover to prevent emulsion mist from entering. When the rolling mill is working, a purge air source delivers purge gas to the purge air port, and the purge air port cleans and purges the outside of the protective cover to prevent emulsion mist and oil from adhering to the gap of the protective cover. The technical solution of the present application can effectively protect the magnetic scale when the rolling mill is working, ensure the stability of the magnetic scale, reduce the frequency of replacing the magnetic scale, and improve work efficiency.

Description

Technical Field

[0001] The present application relates to the field of magnetic scale protection technology, and in particular to a rolling mill magnetic scale protection device and a control method thereof. Background Art

[0002] During the operation of the rolling mill, the roll shifting technology is usually used to control the strip shape. The roll shifting is usually controlled by a hydraulic cylinder, and a magnetic scale is provided on the hydraulic cylinder to measure the movement data of the roll shifting. The magnetic scale is also called a magnetostrictive linear displacement sensor, which uses the magnetostrictive principle to achieve the detection of linear displacement or liquid displacement measurement level accuracy.

[0003] The magnetic scale works in a harsh environment of emulsion mist and oil gas. Under the vibration of the rolling mill, the emulsion mist and oil gas can easily enter the interior of the magnetic scale, causing damage to the magnetic scale. In order to ensure that the data measured by the magnetic scale is stable and effective when the rolling mill is working and to extend the service life of the magnetic scale, the rolling mill magnetic scale needs to be protected.

[0004] The magnetic scale is usually protected by setting a protective cover at the part of the hydraulic cylinder outside where the magnetic scale is connected. However, the sealing between the protective cover and the contact end of the hydraulic cylinder is poor, and oil and gas are easily introduced, causing contamination of the magnetic scale, resulting in inaccurate measurement or damage to the magnetic scale. The magnetic scale needs to be replaced frequently, and the on-site processing and system recovery time are long, which reduces production efficiency. Summary of the invention

[0005] The present application provides a rolling mill magnetic scale protection device and a control method thereof, so as to solve the problem that the conventional magnetic scale protection device has poor protection effect and causes magnetic scale contamination.

[0006] In a first aspect, the present application provides a rolling mill magnetic scale protection device, comprising: a protective cover, a controller, a positive pressure air source, a first proportional valve, a first air pipe, a first air pressure detection unit, a purge air source, a second proportional valve, a second air pipe, a second air pressure detection unit and a purge air port.

[0007] The protective cover is a hollow cylindrical structure, including a connecting end and a blocking end. The connecting end is provided with a mounting platform, and the protective cover is fixed to the outer side of the magnetic scale on the hydraulic cylinder through the mounting platform. The connecting end is provided with a sealing ring, and the connecting end is tightly connected to the hydraulic cylinder.

[0008] The blocking end is provided with an air hole, one end of the first air supply pipe passes through the air hole and is connected to the protective cover, and the other end of the first air supply pipe is connected to the first proportional valve. The first proportional valve is connected to the positive pressure air source. The first air supply pipe is provided with the first air pressure detection unit.

[0009] The purge gas source is connected to the second proportional valve. One end of the second gas pipeline is connected to the second proportional valve, and the other end of the second gas pipeline is connected to the purge gas port. The purge gas port faces the protective cover. The second gas pipeline is provided with the second air pressure detection unit.

[0010] The first proportional valve, the second proportional valve, the first air pressure detection unit, and the second air pressure detection unit are all connected to the controller for communication.

[0011] In a second aspect, the present application provides a method for controlling a rolling mill magnetic scale protection device, which is applied to the above-mentioned rolling mill magnetic scale protection device, and the method comprises:

[0012] The controller sends a positive pressure gas source opening signal to the first proportional valve to open the first proportional valve.

[0013] The positive pressure gas source delivers compressed gas into the protective cover through the first gas delivery pipe.

[0014] The first air pressure detection unit obtains a first pressure value and sends the first pressure value to the controller, where the first pressure value is the pressure of the compressed gas transported by the first gas pipeline.

[0015] The controller obtains a preset compressed air pressure, and compares the first pressure value with the preset compressed air pressure.

[0016] If the first pressure value is not within the preset compressed air pressure range, the controller sends a positive pressure air source adjustment signal to the first proportional valve to adjust the opening ratio of the first proportional valve.

[0017] If the first pressure value is within the preset compressed air pressure range, the controller sends a positive pressure air source holding signal to the first proportional valve to maintain the opening ratio of the first proportional valve.

[0018] The controller obtains a rolling mill status signal, and if the rolling mill is not in a working state, sends a purge gas source closing signal to the second proportional valve to disconnect the second proportional valve.

[0019] If the rolling mill is in working state, a purge gas source opening signal is sent to the second proportional valve to open the second proportional valve.

[0020] The purge gas source delivers the purge gas to the purge gas port through the second gas delivery pipe.

[0021] The second air pressure detection unit acquires a second pressure value and sends the second pressure value to the controller, where the second pressure value is the pressure of the purge gas transported by the second gas pipeline.

[0022] The controller obtains a preset purge air pressure, and compares the second pressure value with the preset purge air pressure.

[0023] If the second pressure value is not within the preset purge air pressure range, the controller sends a purge air source adjustment signal to the second proportional valve to adjust the opening ratio of the second proportional valve.

[0024] If the second pressure value is within the preset purge air pressure range, the controller sends a purge air source holding signal to the second proportional valve to maintain the opening ratio of the second proportional valve.

[0025] The present application provides a rolling mill magnetic scale protection device and a control method thereof, in which a protective cover is installed on the outer side of a magnetic scale on a hydraulic cylinder, a sealing ring is provided at one end of the protective cover connected to the hydraulic cylinder, a through hole is provided at the other end of the protective cover, a sealing gasket is provided in the through hole, and the magnetic scale cable passes through the through hole. The protective cover is tightly connected to the hydraulic cylinder to isolate the magnetic scale from the working environment. An air hole is provided on the protective cover, and a positive pressure air source delivers compressed gas into the protective cover through the air hole to maintain positive air pressure in the protective cover to prevent emulsion mist from entering. When the rolling mill is working, a purge air source delivers purge gas to the purge air port, and the purge air port cleans and purges the outside of the protective cover to prevent emulsion mist and oil from adhering to the gap of the protective cover. The technical solution of the present application can effectively protect the magnetic scale when the rolling mill is working, ensure the stability of the magnetic scale, reduce the frequency of replacing the magnetic scale, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic diagram of the structure of a magnetic scale protection device for a rolling mill provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the cross-sectional structure of the protective cover provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the blocking end structure of the protective cover provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the connection end structure of the protective cover provided in an embodiment of the present application;

[0031] Figure 5 This is a schematic diagram of the control flow of the magnetic ruler protection device for a machine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0033] During the operation of the rolling mill, the roll shifting technology is usually used to control the strip shape. The roll shifting is usually controlled by a hydraulic cylinder, and a magnetic scale is provided on the hydraulic cylinder to measure the shifting roll movement data. The magnetic scale works in a harsh environment of emulsion mist and oil and gas. Under the vibration of the rolling mill, the emulsion mist and oil and gas can easily enter the inside of the magnetic scale, causing damage to the magnetic scale. In order to ensure that the data measured by the magnetic scale is stable and effective when the rolling mill is working and to extend the service life of the magnetic scale, the magnetic scale of the rolling mill needs to be protected. The magnetic scale is usually protected by setting a protective cover at the part connected to the magnetic scale outside the hydraulic cylinder. However, the sealing between the protective cover and the contact end of the hydraulic cylinder is not good, and oil and gas can easily enter, causing contamination of the magnetic scale, resulting in inaccurate measurement or damage to the magnetic scale. The magnetic scale needs to be replaced frequently, and the time for on-site processing and system recovery is long, which reduces production efficiency.

[0034] Based on the above problems, an embodiment of the present application provides a rolling mill magnetic scale protection device and a control method thereof.

[0035] See also Figure 1 The rolling mill magnetic scale protection device provided in the embodiment of the present application includes a protective cover 1, a controller 2, a positive pressure air source 31, a first proportional valve 32, a first air supply pipe 33, a first air pressure detection unit 34, a purge air source 41, a second proportional valve 42, a second air supply pipe 43, a second air pressure detection unit 44 and a purge air port 45. The protective cover 1 is a hollow cylindrical structure, including a connecting end and a blocking end. The connecting end is provided with a mounting platform 12, and the mounting platform 12 is provided with a plurality of mounting holes 121. The mounting holes 121 are evenly distributed along the mounting platform 12. The protective cover 1 includes a fixing component, and the fixing component passes through the mounting hole 121 to fix the protective cover on the hydraulic cylinder.

[0036] In one embodiment, the mounting platform 12 may be a circular ring structure disposed at the connection end of the protective cover 1, the mounting hole 121 may be a screw hole with a threaded inner wall, and the fixing component may be a screw. Figure 2-Figure 4 The diagram shows six mounting holes 121 evenly distributed along the mounting platform 12, through which screws pass to fix the protective cover 1 to the hydraulic cylinder. The mounting platform 12 can also be a rectangular platform evenly distributed along the outer wall of the connecting end of the protective cover 1, and one or more mounting holes 121 can be provided on each mounting platform 12, which is not limited in this embodiment.

[0037] A circular groove 13 is provided on the cross section where the connecting end of the protective cover 1 contacts the hydraulic cylinder, and a sealing ring 131 is provided in the groove 13. The sizes of the groove 13 and the sealing ring 131 are set according to the diameter of the protective cover. In the embodiment provided in the present application, the diameter of the sealing ring 131 is set to 5 cm, the width of the groove 13 is 5 mm, and the depth is 4 mm. The groove 13 is adapted to the sealing ring 131, and the protective cover 1 is tightly connected to the hydraulic cylinder through the sealing ring 131. The protective cover 1 is arranged on the outside of the magnetic scale on the hydraulic cylinder to isolate the part of the magnetic scale exposed outside the hydraulic cylinder from the external working environment such as emulsion mist, oil and gas.

[0038] See also Figure 2 and Figure 3 The blocking end of the protective cover 1 is provided with a boss 15, the center of the boss 15 is provided with a through hole 151, and the inner wall of the through hole 151 is provided with a second sealing gasket 152. The magnetic scale cable passes through the through hole 151 and is tightly connected to the protective cover 1 through the second sealing gasket 152 to prevent mist, oil, gas, etc. from entering the protective cover 1 through the through hole 151, while reducing the wear of the magnetic scale cable. In one embodiment, the protective cover 1 is an integrally formed structure.

[0039] The blocked end of the protective cover 1 is also provided with an air hole 14, and the inner wall of the air hole 14 is provided with a first sealing gasket 141. One end of the first air pipe 33 passes through the air hole 14, and is tightly connected to the protective cover 1 through the first sealing gasket 141, and the other end of the first air pipe 33 is connected to the first proportional valve 32. A first air pressure detection unit 34 is provided on the first air pipe 33, and the first proportional valve 32 is connected to the positive pressure gas source 31. The positive pressure gas source 31 is used to transport compressed gas into the protective cover through the first air pipe 33, and the first proportional valve 32 is used to control the on-off and flow rate of the transported compressed gas. The first air pressure detection unit 34 is used to measure the pressure of the compressed gas transported by the first air pipe 33, and the embodiment of the present application sets the measurement result of the pressure as a first pressure value.

[0040] The first air pressure detection unit 34 and the first proportional valve 32 are both connected to the controller 2 for communication. The controller 2 obtains the first pressure value and controls the on / off of the first proportional valve 32 according to the first pressure value. In one embodiment, in order to ensure that the protective cover is constantly at a positive pressure and prevent mist and oil gas from entering, compressed gas is delivered to the protective cover 1 regardless of whether the rolling mill is in operation or not. Figure 5, the controller sends a positive pressure air source opening signal to the first proportional valve 32 to open the first proportional valve 32. At this time, the positive pressure air source 31 delivers compressed gas into the protective cover. The first air pressure detection unit 34 obtains the first pressure value and sends the first pressure value to the controller 2. The controller 2 obtains the preset compressed air pressure and compares the first pressure value with the preset compressed air pressure. If the first pressure value is not within the preset compressed air pressure range, the controller 2 sends a positive pressure air source adjustment signal to the first proportional valve 32 to adjust the opening ratio of the first proportional valve 32 until the first pressure value is adjusted to the preset compressed air pressure range. If the first pressure value is within the preset compressed air pressure range, the controller 2 sends a positive pressure air source holding signal to the first proportional valve 32 to maintain the opening ratio of the first proportional valve 32. This process is a dynamic adjustment process.

[0041] The controller 2 controls the first proportional valve 32 to allow the positive pressure gas source 31 to deliver compressed gas with stable pressure into the protective cover 1 to prevent mist and oil gas from entering and contaminating the magnetic scale. In one embodiment, the preset compressed gas pressure range can be set to 2 to 3 bar (bar, a unit of pressure).

[0042] In the embodiment of the present application, the air pressure detection unit and the proportional valve can be connected to the controller by wired connection or wireless connection, which is not limited in the present application. In one embodiment, to adapt to the working environment, the proportional valves are all waterproof proportional valves.

[0043] In addition to maintaining the internal pressure of the protective cover 1 at a constant positive pressure to prevent mist from entering, the embodiment of the present application also delivers purge gas to the outside of the protective cover 1 through the purge gas source 41 to keep the outside of the protective cover 1 clean. Figure 1 , the purge gas source 41 is connected to the second proportional valve 42. One end of the second gas pipe 43 is connected to the second proportional valve 42, and the other end is connected to the purge gas port 45. The purge gas source 41 is used to deliver purge gas to the purge gas port 45 through the second gas pipe 43, and the second proportional valve 42 is used to control the on-off and flow rate of the delivered purge gas. The purge gas port 45 is an arc-shaped structure, which is arranged toward the protective cover 1 to clean and purge the outside of the protective cover 1. A second air pressure detection unit 44 is provided on the second gas pipe 43. The second air pressure detection unit 44 is used to measure the pressure of the purge gas delivered by the second gas pipe 43. The embodiment of the present application sets the measurement result of the pressure as a second pressure value.

[0044] The second air pressure detection unit 44 and the second proportional valve 42 are both connected to the controller 2 for communication. The controller 2 obtains the second pressure value and controls the on / off of the second proportional valve 42 according to the second pressure value. Figure 5, the controller 2 obtains the rolling mill status signal to determine whether the rolling mill is in working condition. If the rolling mill is in a non-working state, there is no need to clean and purge the outside of the protective cover 1. The controller 2 sends a purge gas source closing signal to the second proportional valve 42 to disconnect the second proportional valve 42. If the rolling mill is in working condition, the controller 2 sends a purge gas source opening signal to the second proportional valve 42 to open the second proportional valve 42. At this time, the purge gas source 41 delivers purge gas to the purge gas port 45. The second pressure detection unit 44 obtains the second pressure value and sends the second pressure value to the controller 2. The controller 2 obtains the preset purge air pressure and compares the second pressure value with the preset purge air pressure. If the second pressure value is not within the preset purge air pressure range, the controller 2 sends a purge air source adjustment signal to the second proportional valve 42 to adjust the opening ratio of the second proportional valve 42 until the second pressure value is adjusted to the preset purge air pressure range. If the second pressure value is within the preset purge air pressure range, the controller 2 sends a purge air source holding signal to the second proportional valve 42 to maintain the opening ratio of the second proportional valve 42. This process is a dynamic adjustment process.

[0045] During the operation of the rolling mill, the controller 2 controls the second proportional valve 42 to make the purge gas source 41 deliver purge gas that meets the preset purge pressure to the purge gas port 45, clean and purge the outside of the protective cover 1, prevent mist and oil from adhering to the gaps in the protective cover 1, and protect the magnetic scale from being contaminated. When the mill is shut down for maintenance, the second proportional valve 42 is closed to control the purge cycle to be consistent with the working cycle of the rolling mill, thereby reducing costs and maintaining the stability of the magnetic scale. In one embodiment, the preset compressed air pressure range can be set to 4 to 5 bar.

[0046] The present application provides a method for controlling a magnetic scale protection device of a rolling mill, comprising the following steps:

[0047] The controller 2 sends a positive pressure gas source opening signal to the first proportional valve 32 to open the first proportional valve 32 .

[0048] The positive pressure gas source 31 delivers compressed gas into the protective cover 1 through the first gas delivery pipe 33 .

[0049] The first air pressure detection unit 34 obtains a first pressure value and sends the first pressure value to the controller 2 , where the first pressure value is the pressure of the compressed gas transported by the first air pipe 33 .

[0050] The controller 2 obtains a preset compressed air pressure, and compares the first pressure value with the preset compressed air pressure.

[0051] If the first pressure value is not within the preset compressed air pressure range, the controller 2 sends a positive pressure air source adjustment signal to the first proportional valve 32 to adjust the opening ratio of the first proportional valve 32 .

[0052] If the first pressure value is within the preset compressed air pressure range, the controller 2 sends a positive pressure air source holding signal to the first proportional valve 32 to maintain the opening ratio of the first proportional valve 32 .

[0053] The controller 2 obtains a rolling mill status signal, and if the rolling mill is not in operation, sends a purge gas source closing signal to the second proportional valve 42 to disconnect the second proportional valve 42 .

[0054] If the rolling mill is in working state, a purge gas source opening signal is sent to the second proportional valve 42 to open the second proportional valve 42 .

[0055] The purge gas source 41 delivers the purge gas to the purge gas port 45 through the second gas delivery pipe.

[0056] The second air pressure detection unit 44 obtains a second pressure value and sends the second pressure value to the controller 2 , where the second pressure value is the pressure of the purge gas delivered by the second air delivery pipe 43 .

[0057] The controller 2 obtains a preset purge air pressure, and compares the second pressure value with the preset purge air pressure.

[0058] If the second pressure value is not within the preset purge air pressure range, the controller 2 sends a purge air source adjustment signal to the second proportional valve 42 to adjust the opening ratio of the second proportional valve 42 .

[0059] If the second pressure value is within the preset purge air pressure range, the controller 2 sends a purge air source maintaining signal to the second proportional valve 42 to maintain the opening ratio of the second proportional valve 42 .

[0060] The embodiment of the present application provides a rolling mill magnetic scale protection device and a control method thereof. In the device, a protective cover 1 is installed on the outer side of the magnetic scale on the hydraulic cylinder. A sealing ring 131 is provided at one end of the protective cover 1 connected to the hydraulic cylinder, and a through hole 151 is provided at the other end of the protective cover 1. A sealing pad is provided in the through hole 151, and the magnetic scale cable passes through the through hole 151. The protective cover 1 is tightly connected to the hydraulic cylinder to isolate the magnetic scale from the working environment. An air hole 14 is provided on the protective cover 1, and a positive pressure air source 31 delivers compressed gas to the protective cover 1 through the air hole 14 to maintain positive air pressure in the protective cover 1 to prevent emulsion mist and oil gas from entering the working environment. When the rolling mill is working, the purge air source 41 delivers purge gas to the purge air port 45, and the purge air port 45 cleans and purges the outside of the protective cover 1 to prevent emulsion mist and oil from adhering to the gap of the protective cover 1. The technical solution of the present application can effectively protect the magnetic scale when the rolling mill is working, ensure the stability of the magnetic scale, reduce the frequency of replacing the magnetic scale, reduce costs and improve work efficiency.

[0061] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A rolling mill magnetic scale protection device, characterized in that: include: A protective cover (1), a controller (2), a positive pressure gas source (31), a first proportional valve (32), a first gas pipeline (33), a first air pressure detection unit (34), a purge gas source (41), a second proportional valve (42), a second gas pipeline (43), a second air pressure detection unit (44), and a purge gas port (45); The protective cover (1) is a hollow cylindrical structure, comprising a connecting end and a blocking end; the connecting end is provided with a mounting platform (12), and the protective cover (1) is fixed to the outer side of the magnetic scale on the hydraulic cylinder through the mounting platform (12); the connecting end is provided with a sealing ring (131), and the connecting end is hermetically connected to the hydraulic cylinder; The blocking end is provided with an air hole (14); one end of the first air supply pipe (33) passes through the air hole (14) and is connected to the protective cover (1); the other end of the first air supply pipe (33) is connected to the first proportional valve (32); the first proportional valve (32) is connected to the positive pressure air source (31); the first air pressure detection unit (34) is provided on the first air supply pipe (33); The positive pressure gas source (31) is used to deliver compressed gas into the protective cover (1) through the first gas delivery pipe (33); The first air pressure detection unit (34) is used to obtain a first pressure value and send the first pressure value to the controller (2); the first pressure value is the pressure of the compressed gas transported by the first air delivery pipe (33); The controller (2) is configured to obtain the first pressure value and control the on / off of the first proportional valve (32) according to the first pressure value; In the step of obtaining the first pressure value and controlling the on and off of the first proportional valve (32) according to the first pressure value, the controller (2) is further configured to: Sending a positive pressure gas source opening signal to the first proportional valve (32) to open the first proportional valve (32); Obtaining a preset compressed air pressure, and comparing the first pressure value with the preset compressed air pressure; If the first pressure value is not within the preset compressed air pressure range, a positive pressure air source adjustment signal is sent to the first proportional valve (32) to adjust the opening ratio of the first proportional valve; If the first pressure value is within the preset compressed air pressure range, a positive pressure air source holding signal is sent to the first proportional valve (32) to maintain the opening ratio of the first proportional valve; The purge gas source (41) is connected to the second proportional valve (42); one end of the second gas supply pipe (43) is connected to the second proportional valve (42), and the other end of the second gas supply pipe (43) is connected to the purge gas port (45); the purge gas port (45) faces the protective cover (1); the second gas supply pipe (43) is provided with the second air pressure detection unit (44); The first proportional valve (32), the second proportional valve (42), the first air pressure detection unit (34) and the second air pressure detection unit (44) are all connected to the controller (2) for communication.

2. The rolling mill magnetic scale protection device according to claim 1, characterized in that: A first sealing gasket (141) is provided on the inner wall of the air hole (14), and the first air delivery pipe (33) and the protective cover (1) are tightly connected via the first sealing gasket (141).

3. The rolling mill magnetic scale protection device according to claim 1, characterized in that: The sealing end of the protective cover (1) is provided with a boss (15), the center of the boss (15) is provided with a through hole (151), and the inner wall of the through hole (151) is provided with a second sealing gasket (152); the magnetic scale cable passes through the through hole (151) and is tightly connected to the protective cover (1).

4. The rolling mill magnetic scale protection device according to claim 1, characterized in that: The connecting end of the protective cover (1) is provided with a circular groove (13), and the sealing ring (131) is arranged in the groove (13).

5. The rolling mill magnetic scale protection device according to claim 1, characterized in that: The mounting platform (12) is provided with a plurality of mounting holes (121), and the mounting holes (121) are evenly distributed along the mounting platform (12); the protective cover (1) also includes a fixing component, and the fixing component passes through the mounting holes (121) to fix the protective cover (1) on the hydraulic cylinder.

6. The rolling mill magnetic scale protection device according to claim 1, characterized in that: include: The purge gas source (41) is used to deliver purge gas to the purge gas port (45) through the second gas delivery pipe (43); The second air pressure detection unit (44) is used to obtain a second pressure value and send the second pressure value to the controller (2); the second pressure value is the pressure of the purge gas transported by the second air delivery pipe (43); The controller (2) is configured to obtain the second pressure value and control the on and off of the second proportional valve (42) according to the second pressure value.

7. The rolling mill magnetic scale protection device according to claim 6, characterized in that: In the step of obtaining the second pressure value and controlling the on and off of the second proportional valve (42) according to the second pressure value, the controller (2) is further configured as follows: Acquiring a rolling mill status signal, and if the rolling mill is in an off-state, sending a purge gas source closing signal to the second proportional valve (42) to disconnect the second proportional valve (42); If the rolling mill is in operation, a purge gas source opening signal is sent to the second proportional valve (42) to open the second proportional valve (42); Obtaining a preset purge air pressure, and comparing the second pressure value with the preset purge air pressure; If the second pressure value is not within the preset purge air pressure range, sending a purge air source adjustment signal to the second proportional valve (42) to adjust the opening ratio of the second proportional valve; If the second pressure value is within the preset purge air pressure range, a purge air source holding signal is sent to the second proportional valve (42) to maintain the opening ratio of the second proportional valve.

8. A method for controlling a rolling mill magnetic scale protection device, applied to the rolling mill magnetic scale protection device according to any one of claims 1 to 7, characterized in that: The method comprises: The controller (2) sends a positive pressure gas source opening signal to the first proportional valve (32) to open the first proportional valve (32); The positive pressure gas source (31) delivers compressed gas into the protective cover (1) through the first gas delivery pipe (33); The first air pressure detection unit (34) obtains a first pressure value and sends the first pressure value to the controller (2); the first pressure value is the pressure of the compressed gas transported by the first air delivery pipe (33); The controller (2) obtains a preset compressed air pressure and compares the first pressure value with the preset compressed air pressure; If the first pressure value is not within the preset compressed air pressure range, the controller (2) sends a positive pressure air source adjustment signal to the first proportional valve (32) to adjust the opening ratio of the first proportional valve (32); If the first pressure value is within the preset compressed air pressure range, the controller (2) sends a positive pressure air source holding signal to the first proportional valve (32) to maintain the opening ratio of the first proportional valve (32); The controller (2) obtains a rolling mill status signal, and if the rolling mill is in an off-state, sends a purge gas source closing signal to the second proportional valve (42), thereby disconnecting the second proportional valve (42); If the rolling mill is in operation, a purge gas source opening signal is sent to the second proportional valve (42) to open the second proportional valve (42); The purge gas source (41) delivers purge gas to the purge gas port (45) through the second gas delivery pipe (43); The second air pressure detection unit (44) obtains a second pressure value and sends the second pressure value to the controller (2); the second pressure value is the pressure of the purge gas transported by the second air delivery pipe (43); The controller (2) obtains a preset purge air pressure, and compares the second pressure value with the preset purge air pressure; If the second pressure value is not within the preset purge air pressure range, the controller (2) sends a purge air source adjustment signal to the second proportional valve (42) to adjust the opening ratio of the second proportional valve (42); If the second pressure value is within the preset purge air pressure range, the controller (2) sends a purge air source holding signal to the second proportional valve (42) to maintain the opening ratio of the second proportional valve (42).

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