A rolling mill vibration detection system

Abstract

The present application relates to a kind of rolling mill vibration detection systems, it includes vibration real-time monitoring module, vibration analysis and alarm module and roller bearing fault diagnosis module;The vibration real-time monitoring module is used to collect the vibration acceleration of roller and rolling speed;The vibration analysis and alarm module is used for vibration intensity judgment and vibration frequency range judgment;The roller bearing fault diagnosis module identifies fault position and fault type and exports;The present application detects and feeds back the vertical vibration situation of rolling mill in real time, especially for common three times frequency chatter;Through reasonable measuring point selection and acquisition mode, and set vibration intensity and vibration frequency range two-stage alarm mechanism, avoid due to abnormal vibration bring the damage of equipment itself and cause safety production problem, to improve strip yield, optimize strip surface quality and dimensional accuracy, reduce the vibration mark of strip due to vibration.

Description

Technical Field

[0001] This invention relates to the field of metal rolling equipment technology, and in particular to a rolling mill vibration detection system. Background Technology

[0002] In the rolling production of sheet metal, the pickling mill in the cold rolling workshop uses multiple stands for continuous rolling. The rolling speed of the mill increases progressively with the direction of strip product transmission. When the rolling speed increases, the gain of the control system increases or the hydraulic cylinder exceeds a certain stroke, and the mill may experience various forms of vibration. Among them, third-harmonic flutter with a vibration frequency in the range of 125Hz to 240Hz is the most common. When third-harmonic flutter occurs, the thickness of the rolled strip fluctuates abnormally, and the strip shape is also affected, resulting in alternating light and dark vibration marks on the strip surface, which affects the product yield. If the abnormal third-harmonic flutter of the mill is not detected in time, serious production accidents such as strip breakage and roll entanglement are likely to occur, posing a significant safety hazard. The third-harmonic flutter of the mill directly restricts the further improvement of the rolling speed and the development of high-strength thin strip products.

[0003] Third-harmonic chatter is a type of vibration in the vertical system of a rolling mill. Due to the large number of components in the vertical system of a rolling mill, the factors that cause third-harmonic chatter are complex, and currently there is a lack of relevant online detection systems in the production line. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical difficulty of the lack of an online detection system for third-harmonic flutter in the prior art, and to provide a rolling mill vibration detection system for online detection and real-time analysis, so as to avoid abnormal rolling mill flutter from affecting strip quality and improve production safety.

[0005] To address the aforementioned technical problems, this invention provides a rolling mill vibration detection system, comprising:

[0006] A vibration real-time monitoring module includes a first acquisition device, a second acquisition device, and a display device; the first acquisition device is used to acquire the vibration acceleration of the roll, and the second acquisition device is used to acquire the rolling speed of the mill.

[0007] The vibration analysis and alarm module is configured with a first vibration intensity range for third-harmonic flutter in the rolling mill. The module processes the vibration acceleration and outputs a second vibration intensity, comparing it with the first vibration intensity range to determine the vibration intensity. When the second vibration intensity falls within the first vibration intensity range, a system alarm signal is triggered. When the second vibration intensity does not fall within the first vibration intensity range, the second vibration intensity is directly output to the display device.

[0008] A roll bearing fault diagnosis module is connected to the output terminal of the vibration analysis and alarm module. When the system alarm signal is triggered, the second vibration intensity is output from the vibration analysis and alarm module to the roll bearing fault diagnosis module. The fault location and fault type are identified based on the second vibration intensity and the rolling speed and then output to the display device.

[0009] In one embodiment of the present invention, each of the rolls is provided with a set of the first acquisition devices, which are configured at a first measuring point, a second measuring point and a third measuring point; the first measuring point is located on the outer periphery of the roll, and the second measuring point and the third measuring point are respectively located on the two end faces of the roll in the axial direction.

[0010] In one embodiment of the present invention, the first acquisition device includes a first acceleration sensor and a second acceleration sensor; the first acceleration sensor is used to be placed at the first measuring point, and the second acceleration sensor is used to be placed at the second measuring point; both the first acceleration sensor and the second acceleration sensor are configured as unidirectional acceleration sensors, used to measure the vibration acceleration of the roll in the vertical direction.

[0011] In one embodiment of the present invention, the first acquisition device further includes a third acceleration sensor, which is placed at the third measuring point. The third acceleration sensor is configured as a triaxial vibration acceleration sensor to measure the vibration acceleration of the roll in the vertical direction, the roll axis direction, and the tangential direction at the contact position between the roll and the strip.

[0012] In one embodiment of the present invention, the first measuring point, the second measuring point, and the third measuring point are all provided with protective covers, and the protective covers are provided with through holes; the first acquisition device is housed in a cavity inside the protective cover, and the output end of the first acquisition device is connected to the vibration analysis and alarm module through the through hole; the through hole is provided with sealant to fix the output end of the first acquisition device.

[0013] In one embodiment of the present invention, when the first acquisition device continuously acquires the vibration acceleration, the formula for calculating the second vibration intensity is:

[0014]

[0015] Among them, V rms The second vibration intensity is T, the acquisition time of the vibration signal is T, and v(t) is the vibration velocity obtained by integrating the vibration acceleration.

[0016] When the first acquisition device acquires discrete vibration acceleration data, the formula for calculating the second vibration intensity is:

[0017]

[0018] Among them, V rms The second vibration intensity is N, the number of discrete data points is N, and v(n) is the vibration velocity obtained by integrating the vibration acceleration obtained from the nth measurement.

[0019] In one embodiment of the present invention, the vibration analysis and alarm module can also output a third harmonic bandwidth peak value, compare the third harmonic bandwidth peak value with the bandwidth range in which the rolling mill experiences third harmonic flutter, and determine the vibration frequency band; when the third harmonic bandwidth peak value falls into the bandwidth range, the vibration analysis and alarm module triggers an on-site alarm signal, the alarm signal including an audible and / or visual alarm signal; when the third harmonic bandwidth peak value does not fall into the bandwidth range, the third harmonic bandwidth peak value is directly output to the display device.

[0020] In one embodiment of the present invention, the display device includes a display for displaying in real time the vibration waveform, peak value, skewness, kurtosis, and operating index of the roll, wherein the operating index of the roll includes the second vibration intensity and the third harmonic bandwidth peak value.

[0021] In one embodiment of the present invention, the second acquisition device includes a speed sensor, which is mounted on the coupling of the motor shaft and is used to measure the rotational speed of the motor shaft as the rolling speed.

[0022] In one embodiment of the present invention, the roll bearing fault diagnosis module further includes a big data-assisted management component, which is used to manage and maintain the roll bearing fault characteristic frequency parameter library and store the vibration acceleration, second vibration intensity and rolling speed.

[0023] The technical solution of the present invention has the following advantages compared with the prior art:

[0024] The mill vibration detection system described in this invention can detect and provide feedback on mill vibration in real time, especially for common third-harmonic flutter. By selecting appropriate measurement points and acquisition methods, and setting up a two-level alarm mechanism for vibration intensity and vibration frequency, the system can monitor real-time vertical vibration and vibration trends while increasing the mill's rolling speed. This helps reduce internal wear of the mill, avoids damage to the equipment itself due to abnormal vibration, reduces the incidence of safety accidents, and ultimately increases strip production, optimizes strip surface quality and dimensional accuracy, and reduces vibration marks on the strip. Attached Figure Description

[0025] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0026] Figure 1 This is a logic block diagram of the mill vibration detection system in a preferred embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the mill vibration detection system in a preferred embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the roller and the first collection device in a preferred embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the measuring point positions of the rolls in a preferred embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the installation of the first acquisition device in a preferred embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the installation of the second acquisition device in a preferred embodiment of the present invention;

[0032] Figure 7 yes Figure 6 A cross-sectional view of the installation diagram.

[0033] Explanation of reference numerals in the accompanying drawings: 1. Rolling mill; 11. Rolling mill stand; 12. Support roll; 13. Intermediate roll; 14. Work roll; 15. Strip; 2. First acquisition device; 21. First accelerometer; 22. Second accelerometer; 23. Third accelerometer; 24. First measuring point; 25. Second measuring point; 26. Third measuring point; 3. Protective cover; 4. Sealant; 5. Bolt; 6. Second acquisition device; 7. Rotating shaft; 8. Metal marker block; 9. Eddy current sensor. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0035] Example

[0036] Reference Figures 1 to 7As shown, this invention provides a mill vibration detection system, which includes a real-time vibration monitoring module, a vibration analysis and alarm module, and a roll bearing fault diagnosis module. Vibration data is collected by setting measuring points on the rolls of the mill 1. Combined with input process parameters, the system analyzes and detects the working status of the mill 1 in real time. When abnormal vibration occurs in the rolls, especially the common third-harmonic flutter, the system promptly detects and triggers system alarm signals and on-site alarm signals. This allows technicians to promptly grasp the equipment's operating status without requiring prior equipment fault diagnosis knowledge. It enables stable and reliable maintenance of the mill and provides full lifecycle tracking and analysis of components such as roll bearings, intelligently determining the operating status and fault location of the roll bearings.

[0037] Specifically, the real-time vibration monitoring module is used to access on-site hardware devices, collect data, and set process parameters. The real-time vibration monitoring module includes a first acquisition device 2, a second acquisition device 6, and a display device. The first acquisition device 2 is used to collect the vibration acceleration of the rolls, and the second acquisition device 6 is used to collect the rolling speed of the mill 1. The real-time vibration monitoring module also includes a vibration data acquisition instrument, a signal conditioner, and an acquisition controller, capable of collecting on-site voltage and / or current data, converting the collected data into operating indices and speed parameters that characterize the roll's operating status in real time, and outputting them to the display device for real-time display. Simultaneously, referring to… Figure 2 As shown, the vibration real-time monitoring module can also interact with the upper server of process parameters through the network, read relevant process parameters in real time and output them, so that on-site technicians can understand and query the mill operation status and grasp the mill vibration status in a timely manner.

[0038] Furthermore, refer to Figure 3 and Figure 4As shown, the rolling mill 1 is equipped with at least three sets of rolls, including a pair of work rolls 14, a pair of intermediate rolls 13, and a pair of support rolls 12 arranged opposite each other on both sides of the strip thickness direction. The rolls are arranged in the following order from the surface of the strip 15 outwards: the work rolls 14, the intermediate rolls 13, and the support rolls 12. Through the coordinated rotation of the multiple sets of rolls, the strip 15 is rolled between the pair of work rolls 14 and passes through the rolling mill 1. The inventors of this invention have discovered that during the strip rolling process... The rolling speed of the rolling mill 1 gradually increases with the conveying direction of the strip 15 when multiple rolling mills 1 are used for continuous rolling. When five rolling mills 1 are used for continuous rolling, the rolling speed of the fourth and fifth rolling mills increases to about 1200 m / min, which is very prone to abnormal vibration. Therefore, in this embodiment of the invention, it is preferably set in some rolling mills with a rolling speed of 1200 m / min or higher in the continuous rolling production line of the pickling and rolling mill group. In some embodiments, this embodiment of the invention can also be used for rolling mills with other rolling speeds in the production line, and is not limited thereto. When the vibration real-time monitoring module collects data, each of the rolls in the mill stand 11 may experience abnormal vibration. Therefore, each roll is equipped with a set of the first acquisition device 2. The first acquisition device 2 is equipped with a first measuring point 24, a second measuring point 25 and a third measuring point 26. The first measuring point 24 is located on the outer periphery of the roll, and the second measuring point 25 and the third measuring point 26 are located on the two end faces of the roll in the axial direction of the roll, respectively. Figure 4 As shown, the roll includes an operating side and a transmission side along the axial direction. The operating side is located near the operating table and is used for replacing and maintaining the roll. The transmission side is located near the drive motor and transmission shaft. In some embodiments, the first measuring point 24 and the third measuring point 26 are located on the operating side, and the second measuring point 25 is located on the transmission side. When a fault occurs, the faulty roll can be replaced individually by detecting the fault location, thereby reducing production costs and improving production efficiency.

[0039] Furthermore, refer to Figure 3 and Figure 4As shown, the first acquisition device 2 includes a first acceleration sensor 21 and a second acceleration sensor 22. The first acceleration sensor 21 is placed at the first measuring point 24 and is mounted on the top of the mill stand 11. The second acceleration sensor 22 is placed at the second measuring point 25 and is mounted on the bearing seat on the roll drive side. Both the first acceleration sensor 21 and the second acceleration sensor 22 are configured as unidirectional acceleration sensors to measure the vibration acceleration of the roll in the vertical direction. The first acquisition device 2 also includes a third acceleration sensor 23, which is placed at the third measuring point 26 and is mounted on the bearing seat on the roll operation side. The third acceleration sensor 23 is configured as a triaxial vibration acceleration sensor to measure the vibration acceleration of the roll in the vertical direction, the roll axis direction, and the tangential direction at the contact position between the roll and the strip. The tangential direction at the contact position between the roll and the strip on the outer periphery of the roll is the transmission direction of the strip 15. The vibration acceleration collected by the first acquisition device 2 is input to the vibration real-time monitoring module via a shielded cable arranged on site. In some embodiments, in order to facilitate the evaluation of its vibration state, the vibration acceleration obtained from each measuring point is integrated into the vibration velocity by an integrator before entering the first acquisition device 2. The first acquisition device 2 is configured with multiple measuring points to improve the detection accuracy and precision of the roll.

[0040] Furthermore, refer to Figure 5 As shown, the first measuring point 24, the second measuring point 25, and the third measuring point 26 are all equipped with protective covers 3. The open side of the protective cover 3 is fixed to the surface of the measuring point by bolts 5, and the protective cover 3 is provided with through holes. The first acquisition device 2 is housed in the cavity inside the protective cover 3, and the output end of the first acquisition device 2 is connected to the vibration analysis and alarm module through the through holes. Sealant 4 is provided in the through holes to fix the output end of the first acquisition device 2. The protective cover 3 can prevent damage to the sensor from accidents such as falling objects from heights and collisions. The first acquisition device 2 adopts an IP67 protection rating to reduce the influence of high temperature and water vapor. The sealant 4 can also prevent water vapor from damaging the first acquisition device 2 during unit operation, thus extending the service life of the detection system of the present invention. In some embodiments, the first acquisition device 2 uses an integrated cable accelerometer sensor. The sensor and signal cable adopt a quick interface for easy disassembly and assembly, and easy replacement of rolls.

[0041] Specifically, refer to Figure 6As shown, the vibration real-time monitoring module also includes a second acquisition device 6, which includes a speed sensor. The speed sensor is installed at the main shaft coupling of the motor shaft 7 and is used to measure the speed of the main motor shaft 7 as the rolling speed. The measurement result is introduced into the vibration real-time monitoring module via a cable. (Refer to...) Figure 6 and Figure 7 The diagram shows the installation of the second acquisition device 6. The main shaft coupling of the motor shaft 7 has a large installation space and requires less daily maintenance and disassembly, which facilitates the installation and daily maintenance of the second acquisition device 6. The metal marker block 8 for measuring the rotational speed is installed on the coupling. The metal marker block 8 and the eddy current sensor 9 are located on both sides of the bracket, which has little impact on key structures such as the shaft 7.

[0042] Specifically, the vibration analysis and alarm module is pre-set with a first vibration intensity range for third-harmonic flutter in the rolling mill, and a bandwidth range for third-harmonic flutter in the rolling mill. At least one endpoint of each of the first vibration intensity range and the bandwidth range is set as a threshold. The vibration analysis and alarm module mainly performs real-time analysis and mining of vibration acceleration, rolling speed, and current and voltage parameters collected by the real-time vibration monitoring module. This allows for intelligent assessment of the vertical vibration state of the rolling mill and the vibration state of the roll bearings, determining the vertical vibration or roll bearing vibration operating index. The roll operating index includes the second vibration intensity and the peak value of the third-harmonic bandwidth of the rolling mill 1. When the first acquisition device 2 continuously acquires the vibration acceleration, the calculation formula for the second vibration intensity is...

[0043]

[0044] Among them, V rms The second vibration intensity is T, the acquisition time of the vibration signal is T, and v(t) is the vibration velocity obtained by integrating the vibration acceleration.

[0045] When the first acquisition device 2 acquires discrete vibration acceleration data, the formula for calculating the second vibration intensity is:

[0046]

[0047] Among them, V rms The second vibration intensity is N, the number of discrete data points is N, and v(n) is the vibration velocity obtained by integrating the vibration acceleration obtained from the nth measurement.

[0048] The vibration analysis and alarm module processes the vibration acceleration and outputs the second vibration intensity. It compares the second vibration intensity with the first vibration intensity range to determine the vibration intensity. When the second vibration intensity falls within the first vibration intensity range or exceeds a set threshold, a system alarm signal is triggered. When the second vibration intensity does not fall within the first vibration intensity range, the second vibration intensity is directly output to the display device. The vibration analysis and alarm module can also compare the peak value of the third harmonic bandwidth with the bandwidth range where the rolling mill experiences third harmonic flutter to determine the vibration frequency range. When the peak value of the third harmonic bandwidth falls within this bandwidth range or exceeds a set threshold, the vibration analysis and alarm module triggers a field alarm signal, including audible and / or visual alarm signals, to alert field technicians that the rolling mill may have abnormal vibrations or that the roll bearings may be faulty. This allows field technicians to adjust relevant process parameters in a timely manner to prevent further development of abnormal rolling mill vibrations that could lead to strip quality problems or strip breakage accidents. When the peak value of the third harmonic bandwidth does not fall within this bandwidth range, the peak value of the third harmonic bandwidth is directly output to the display device.

[0049] Furthermore, the roll bearing fault diagnosis module includes a big data-assisted management component. When the vibration analysis and alarm module triggers a system alarm signal, the big data-assisted management component will be activated to record relevant vibration parameters and process parameters when the mill vibration is abnormal, facilitating on-site technical management personnel to determine the cause of the abnormal mill vibration. Simultaneously, the roll bearing fault diagnosis module is connected to the output of the vibration analysis and alarm module to further analyze the bearing fault. The roll bearing fault diagnosis module is embedded with a bearing intelligent diagnosis expert system. When the system alarm signal is triggered, the expert system can automatically determine the bearing fault type and fault location by automatically analyzing the abnormal roll bearing vibration data such as the second vibration intensity and the rolling speed, and output the results to the display device.

[0050] Furthermore, the big data-assisted management component primarily manages and maintains the bearing fault characteristic frequency parameter database, stores and manages the technical parameters of hardware devices such as the first acquisition device 2 and the second acquisition device 6, and sets and manages the threshold values ​​for mill vibration and roll bearing vibration. The big data-assisted management component stores and manages the original vibration parameters and process parameters, such as vibration acceleration, second vibration intensity, and rolling speed, when mill 1 or roll bearings experience abnormal vibration, facilitating shift handover and troubleshooting of abnormal vibration causes for technical management personnel. Simultaneously, the component also reserves an interface for deep mining of mill abnormal vibration and process parameter big data, utilizing a mill abnormal vibration deep mining expert system to optimize the process parameters of the pickling mill unit.

[0051] Specifically, refer to Figure 2As shown, the display device is configured as a client operation terminal and / or client application terminal. The client application terminal can be a PC or other display. The display device is used to display in real time the vibration waveform, peak value, skewness, kurtosis of the roll, as well as the roll's operating index, mill vibration trend analysis, automatic bearing vibration spectrum analysis, intelligent identification of fault characteristic frequencies, bearing fault alarm, and intelligent fault location results. The mill vibration detection system can also provide electronic shift handover information, has data query, report output, and printing functions, is equipped with a big data intelligent analysis and mining interface, and can configure remote access permissions for client authorization.

[0052] Specifically, refer to Figure 2 As shown, the rolling mill vibration detection system is configured as an open distributed system, employing a three-tier architecture of hardware-server-client application. The real-time vibration monitoring module, the vibration analysis and alarm module, the roll bearing fault diagnosis module, and the big data-assisted management component can all access the system database of the rolling mill vibration detection system. The database interface is planned to use SQL Server, and the software design utilizes standard plug-in technology to facilitate browsing and maintenance of the system database. The system database includes at least: a regular database, an alarm database, and a historical database; the regular database includes a regular feature value database and a regular text database. The system includes a conventional feature value database that stores statistical features such as mill exit belt speed, main motor speed, third harmonic frequency bandwidth peak value, second vibration intensity, vibration peak value, skewness, and kurtosis. A conventional text database stores real-time data during the rolling process (including process parameters such as main motor speed, exit belt speed, and roll diameter), facilitating comprehensive analysis and status traceability; data is automatically deleted periodically. The alarm database includes an alarm feature value database and an alarm text database; when an alarm is triggered, all real-time data and feature data are saved; when the database is full, it is automatically backed up and deleted. The historical database can store six months' worth of feature data for easy querying and analysis, and data is backed up every six months. The mill vibration detection system can provide early warning of abnormal third harmonic frequency chatter and monitor the entire lifecycle of roll bearings, ensuring stable and reliable equipment operation, convenient maintenance, and compliance with the characteristics of cold rolling mill pickling units and production line requirements. It also promotes the optimization of rolling processes, increases rolling speed, and enhances strip production capacity.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A rolling mill vibration detection system, characterized in that, include, A vibration real-time monitoring module includes a first acquisition device, a second acquisition device, and a display device; the first acquisition device is used to acquire the vibration acceleration of the roll, and the second acquisition device is used to acquire the rolling speed of the mill. The vibration analysis and alarm module is configured with a first vibration intensity range for third-harmonic flutter in the rolling mill. The module processes the vibration acceleration and outputs a second vibration intensity, comparing it with the first vibration intensity range to determine the vibration intensity. When the second vibration intensity falls within the first vibration intensity range, a system alarm signal is triggered. When the second vibration intensity does not fall within the first vibration intensity range, the second vibration intensity is directly output to the display device. A roll bearing fault diagnosis module is connected to the output terminal of the vibration analysis and alarm module. When the system alarm signal is triggered, the second vibration intensity is output from the vibration analysis and alarm module to the roll bearing fault diagnosis module. The fault location and fault type are identified based on the second vibration intensity and the rolling speed and then output to the display device.

2. The mill vibration detection system according to claim 1, characterized in that: Each of the rolls is provided with a set of the first acquisition devices, which are configured at a first measuring point, a second measuring point, and a third measuring point; the first measuring point is located on the outer periphery of the roll, and the second measuring point and the third measuring point are respectively located on the two end faces of the roll along the axial direction.

3. The mill vibration detection system according to claim 2, characterized in that: The first acquisition device includes a first acceleration sensor and a second acceleration sensor; the first acceleration sensor is used to be placed at the first measuring point, and the second acceleration sensor is used to be placed at the second measuring point; both the first acceleration sensor and the second acceleration sensor are configured as unidirectional acceleration sensors, used to measure the vibration acceleration of the roll in the vertical direction.

4. The mill vibration detection system according to claim 2, characterized in that: The first acquisition device further includes a third acceleration sensor, which is placed at the third measuring point. The third acceleration sensor is configured as a three-dimensional vibration acceleration sensor to measure the vibration acceleration of the roll in the vertical direction, the roll axis direction, and the tangential direction at the contact position between the roll and the strip.

5. The mill vibration detection system according to claim 2, characterized in that: The first, second, and third measuring points are all equipped with protective covers, and the protective covers are provided with through holes; the first acquisition device is housed in a cavity inside the protective cover, and the output end of the first acquisition device is connected to the vibration analysis and alarm module through the through holes; the output end of the first acquisition device is fixed with sealant inside the through holes.

6. The mill vibration detection system according to claim 1, characterized in that: When the first acquisition device continuously acquires the vibration acceleration, the formula for calculating the second vibration intensity is: ， in, The second vibration intensity, The acquisition time of the vibration signal. The vibration velocity is obtained by integrating the vibration acceleration; When the first acquisition device acquires discrete vibration acceleration data, the formula for calculating the second vibration intensity is: ， in, The second vibration intensity, For the number of discrete data, The vibration velocity is obtained by integrating the vibration acceleration from the nth measurement.

7. The mill vibration detection system according to claim 1, characterized in that: The vibration analysis and alarm module can also output a third harmonic bandwidth peak value, compare the third harmonic bandwidth peak value with the bandwidth range where the rolling mill experiences third harmonic flutter, and determine the vibration frequency range; when the third harmonic bandwidth peak value falls within the bandwidth range, the vibration analysis and alarm module triggers an on-site alarm signal, the alarm signal including audible and / or visual alarm signals; when the third harmonic bandwidth peak value does not fall within the bandwidth range, the third harmonic bandwidth peak value is directly output to the display device.

8. The mill vibration detection system according to claim 7, characterized in that: The display device includes a display for displaying in real time the vibration waveform, peak value, skewness, kurtosis, and operating index of the roll, wherein the operating index of the roll includes the second vibration intensity and the peak value of the third harmonic bandwidth.

9. The mill vibration detection system according to claim 1, characterized in that: The second acquisition device includes a speed sensor, which is installed on the coupling of the motor shaft and is used to measure the rotational speed of the motor shaft as the rolling speed.

10. The mill vibration detection system according to claim 1, characterized in that: The roll bearing fault diagnosis module also includes a big data-assisted management component, which is used to manage and maintain the roll bearing fault characteristic frequency parameter library and store the vibration acceleration, second vibration intensity and rolling speed.

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