Method for initializing algorithm parameters of a system for monitoring the diameter and vibrations of a hot rolling mandrel

Abstract

The application discloses a system for monitoring the expansion and vibration of a hot rolling drum, which comprises a hot rolling drum with a measuring structure, a data acquisition and data processing system, and the hot rolling drum comprises an expansion and contraction hydraulic cylinder, a connecting body, a half-coupling, a mandrel, a sector plate, an extension shaft, a displacement measuring unit and a vibration measuring characteristic component; the half-coupling is arranged in the mounting hole of the connecting body and connects the piston of the expansion and contraction hydraulic cylinder and the mandrel; the sector plate is sleeved outside the mandrel; the displacement measuring unit is arranged on the half-coupling; and the vibration measuring characteristic component is connected with the extension shaft; the data acquisition and data processing system is connected with the hot rolling drum with the measuring structure through a space medium to realize data transmission and characteristic acquisition under a non-contact condition. When the hot rolling drum is working, the displacement measuring unit transmits data to the data acquisition and data processing system, and the vibration measuring unit transmits characteristics to the data acquisition and data processing system, so that the expansion and vibration of the hot rolling drum can be monitored.

Description

Technical Field

[0001] This invention relates to the field of monitoring, and in particular to a monitoring and analysis system for the expansion diameter and vibration of hot-rolled coils, and a method for initializing algorithm-related parameters in the monitoring system. Background Technology

[0002] Hot-rolled coils are key equipment on hot-rolled strip steel production lines. Their function is to unroll steel coils or roll extra-long steel strips into a cylindrical shape for later storage and transportation. The main working part of the coil achieves expansion and contraction through the radial movement of sector plates, and controlling the expansion diameter plays a crucial role in the coiling process. Furthermore, since one end of the coil is fixed and the other end is movable, the vibration amplitude of the movable end is also a significant factor affecting the smooth operation of the coiling process.

[0003] Currently, there are two main methods for monitoring the expansion diameter of drums: 1. Installing a magnetic ring displacement sensor inside the rotary joint of the drum's expansion and contraction hydraulic cylinder. The disadvantages are: 1) The rotary joint has a compact internal structure, requiring the installation of a magnetic ring and a narrow hole for the sensor, making manufacturing difficult; 2) Due to space constraints, the gap between the sensor and the rotary joint is small, causing significant vibration during high-speed rotation, leading to interference and wear between the joint and sensor, resulting in abnormal sensor damage; 2. Using a non-contact ultrasonic sensor to measure the displacement of a measuring disc connected to the spindle. The disadvantages are: 1) To accommodate the ultrasonic sensor's position, the measuring disc diameter is much larger than the drum's main body size, resulting in significant weight and hindering compact on-site arrangement; 2) The measuring disc lacks protection, and during on-site operation, oil and water droplets can distort the ultrasonic sensor's measurement values; 3) The measuring disc is difficult to transport and install on-site. Chinese patent ZL202220583376.X discloses a device for detecting the expansion diameter of a drum. This patent improves the original ultrasonic measurement system by adding a signal plate to the measuring plate, but the shortcomings of the measuring plate cannot be overcome.

[0004] For vibration monitoring of the drum: Since the drum is a rotating integral component, wired vibration sensors cannot be installed on the rotating body and function properly. The traditional method is to install the vibration sensor at the bearing of the support seat connected to the drum to obtain the drum's vibration parameters. The disadvantage is that, because the vibration-sensitive parts of the hot-rolled drum operate in a high-temperature environment (above 300°C), the vibration sensor cannot be installed near the area of ​​interest. Instead, it is installed at a relatively distant location, such as the bearing of the support seat, for indirect measurement, resulting in more interference and making it difficult to accurately reflect the drum's vibration state. This makes it difficult to detect and assess the drum's vibration condition. Summary of the Invention

[0005] The problem this invention aims to solve is to provide a monitoring system for the expansion diameter and vibration of hot-rolled coils. During operation, the displacement measurement unit transmits data to a data acquisition and processing system, while the vibration measurement unit transmits features to the same system, thereby enabling the monitoring of expansion diameter and vibration. Furthermore, this invention also provides a method for initializing algorithm-related parameters within the monitoring system, ensuring the accuracy and reliability of the data.

[0006] This invention discloses a hot-rolled coil expansion and vibration monitoring system, comprising a hot-rolled coil with a measurement structure and a data acquisition and processing system. The hot-rolled coil includes an expansion and contraction hydraulic cylinder, a connecting body, a half-coupling, a mandrel, a sector plate, an extension shaft, a displacement measuring unit, and a vibration measuring feature component. The left and right ends of the connecting body are connected to the expansion and contraction hydraulic cylinder and a support. The half-coupling is installed in the mounting hole of the connecting body, connecting the piston of the expansion and contraction hydraulic cylinder and the mandrel. The sector plate is sleeved on the outside of the mandrel. The extension shaft is connected to the end face of the mandrel. The displacement measuring unit is installed on the half-coupling. The vibration measuring feature component is connected to the extension shaft. The data acquisition and processing system communicates with the hot-rolled coil with the measurement structure through a spatial medium to achieve data transmission and feature acquisition under non-contact conditions.

[0007] Furthermore, the data acquisition and processing system includes a host computer, a wireless data receiving and forwarding module, a camera, an auxiliary module, a controller, and a signal conditioning and data transmission module. The monitoring software in the host computer contains a diameter displacement algorithm and a centroid vibration algorithm. All modules, units, controllers, cameras, and the host computer are connected by cables.

[0008] Furthermore, the displacement measurement unit includes a contact displacement sensor, an integrated block, and a limiting component. The integrated block includes a power supply, a signal transmission and data transmission module, and a transmitting antenna. The contact displacement sensor and the integrated block are both fixed on the top of the half coupling, and the limiting component is fixed on the top of the connecting body. The axially telescopic measuring rod of the contact displacement sensor is connected to the limiting component, and the integrated block is connected to the contact displacement sensor.

[0009] Furthermore, the vibration measurement feature component is connected to the right end face of the extension shaft, and the camera is set at a distance L from the vibration measurement feature component of the end cover; the end face of the vibration measurement feature component opposite to the camera has shape I and shape II1, shape I is a circle or arc, and shape II surrounds shape I.

[0010] Furthermore, shape II is a circle, a regular polygon, or other closed contour.

[0011] Furthermore, when the vibration measurement feature component is a single end cap, a protrusion B is provided on the end face A of the end cap, the outer contour of the protrusion B is shape I, and the outer contour of the end face A is shape II.

[0012] Furthermore, when the vibration measurement feature component is a single end cap, a circular hole C is provided on the end face A of the end cap. The center of the circular hole C is concentric or eccentric with the center of the end cap. The outer contour of the circular hole C is shape I, and the outer contour of the end face A is shape II.

[0013] Furthermore, when the vibration measurement feature component is an assembly of an end cap and a circular part, a circular hole C is provided on the end face A of the end cap, the center of the circular hole C is concentric or eccentric with the center of the end cap, the outer contour of the circular hole C is shape I, and the outer contour of the end face A is shape II; the circular part is embedded in the circular hole C.

[0014] Furthermore, when the vibration measurement feature component is an assembly of an end cap and a circular part, a protrusion B is provided on the end face A of the end cap, the outer contour of the protrusion B is a circle in shape I, and the outer contour of the end face A is shape II; the circular part is a ring part, which is fitted over the protrusion B.

[0015] The initialization method for algorithm-related parameters in the monitoring system of this invention is as follows: ① Before the drum is working, the camera is used to perform image calibration on the vibration measurement feature component. The size of shape I in the captured image is calibrated with its actual size to obtain the image scaling factor at distance L; ② According to the internal structural features of the drum and their correlation, the theoretical formula for the linear relationship between the expansion diameter and the extension / retraction of the contact displacement sensor is y = ax + b, where the constant a is related to the internal structural features of the drum; Before the drum is working, the expansion and contraction hydraulic cylinder is used by the loading system to drive the spindle to move axially, while the sector plate expands or contracts radially. The displacement of radial expansion or contraction is the expansion diameter. The values ​​y of multiple expansion diameters are measured by the measuring tool, and the actual value x of the axially extendable measuring rod of the contact displacement sensor is recorded at each expansion diameter. The data is linearly fitted to obtain the constant b; ③ The correction coefficients a and b, the image scaling factor, etc., are used as the corresponding parameters input in the expansion diameter displacement algorithm and the centroid vibration algorithm in the monitoring software of the host computer.

[0016] The working principle of the expansion diameter and vibration monitoring system of the present invention is as follows: when the hot rolling drum is working, the displacement measurement unit transmits the data to the data acquisition and processing system, and the vibration measurement unit transmits the characteristics to the data acquisition and processing system, thereby realizing the monitoring of expansion diameter and vibration.

[0017] The advantages of the expansion diameter and vibration monitoring system of this invention are: 1. The displacement measurement unit is installed on top of the half coupling, which does not require installation inside the rotary joint or additional measuring disc, providing ample installation space and preventing abnormal damage to the displacement measurement unit, ensuring reliable measurement values; 2. The vibration measurement feature component is directly set at the vibrating part that needs attention, i.e., near the end of the sector plate, minimizing interference and accurately reflecting the drum's vibration state; 3. When the drum rotates, the displacement measurement unit, vibration measurement feature component, etc., rotate together with the drum, preventing the signal cables of sensors from being broken due to drum rotation, thus ensuring reliable monitoring of expansion diameter and vibration. Attached Figure Description

[0018] Figure 1 This is a schematic block diagram of the architecture of the hot-rolled coil expansion diameter and vibration monitoring system of the present invention;

[0019] Figure 2 This is a structural block diagram of the displacement measurement unit;

[0020] Figure 3 This is a schematic diagram of the expansion diameter and vibration monitoring system for the hot-rolled coil of the present invention;

[0021] Figure 4 This is a schematic diagram of the shape of a single end cap. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the shape of a single end cap. Figure 2 ;

[0023] Figure 6 This is a schematic diagram of the shape of a single end cap. Figure 3 ;

[0024] Figure 7 This is a schematic diagram of the shape of a single end cap. Figure 4 ;

[0025] Figure 8 This is a schematic diagram of the shape of the end cap and the circular component. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the shape of the end cap and the circular component. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the shape of the end cap and the circular component. Figure 3 ;

[0028] Figure 11 This is a schematic diagram of the shape of the end cap and the circular component. Figure 4 . Detailed Implementation

[0029] The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form and number of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] Example 1

[0031] from Figure 1 , Figure 3 As can be seen, the hot-rolled coil expansion and vibration monitoring system of the present invention includes a hot-rolled coil 1 with a measurement structure and a data acquisition and processing system 2. The hot-rolled coil 1 includes an expansion and contraction hydraulic cylinder 10, a connecting body 11, a half coupling 12, a mandrel 13, a sector plate 14, an extension shaft 15, a displacement measuring unit, and a vibration measuring feature component 19. The left and right ends of the connecting body 11 are connected to the expansion and contraction hydraulic cylinder 13 and the support 3. The half coupling 12 is set in the mounting hole of the connecting body 11, connecting the piston of the expansion and contraction hydraulic cylinder 10 and the mandrel 13. The sector plate 14 is sleeved on the outside of the mandrel 13. The extension shaft 15 is connected to the end face of the mandrel 13. The displacement measuring unit is set on the half coupling 12. The vibration measuring feature component 19 is connected to the extension shaft 15. The data acquisition and processing system 2 and the hot-rolled coil 1 with the measurement structure are connected through a spatial medium to realize data transmission and feature acquisition under non-contact conditions.

[0032] When the hot-rolled coil is in operation, the expansion and contraction hydraulic cylinder 10 drives the mandrel 13 to move axially, and drives the sector plate 14 to expand radially through the internal mechanism of the coil; at the same time, the expansion and contraction hydraulic cylinder 10, the half coupling 2, the connecting body 11, the mandrel 13, and the sector plate 14 rotate synchronously, thereby realizing the coiling of the steel coil; after the coiling is completed, the expansion and contraction hydraulic cylinder 10 drives the mandrel 13 to move in the opposite direction axially, and drives the sector plate 14 to contract radially through the internal mechanism of the coil, thereby removing the steel coil.

[0033] During the operation of the hot-rolled coil, the displacement measurement unit transmits data to the data acquisition and processing system 2, and the vibration measurement unit transmits characteristics to the data acquisition and processing system 2, thereby realizing the monitoring of expansion diameter and vibration. The displacement measurement unit is installed on top of the half-coupling 12, eliminating the need for installation inside the rotary joint or an additional measuring plate. This provides ample installation space, preventing abnormal damage to the displacement measurement unit and ensuring reliable measurement values. The vibration measurement characteristic component 19 is directly positioned near the vibrating part of the sector plate 14, minimizing interference and accurately reflecting the coil's vibration state. Furthermore, as the coil rotates, the displacement measurement unit and vibration measurement characteristic component 19 rotate with it, preventing the signal cables of sensors from being broken due to coil rotation, thus ensuring reliable monitoring of expansion diameter and vibration.

[0034] Example 2

[0035] from Figure 1 It is understood that the expansion diameter and vibration monitoring system of the present invention includes a data acquisition and processing system 2 comprising a host computer 20, a wireless data receiving and forwarding module 21, a camera 22, an auxiliary module 23, a controller 24, and a signal conditioning and data transmission module 25. The monitoring software in the host computer 20 contains an expansion diameter displacement algorithm 26 and a centroid vibration algorithm 27. Each module, unit, controller, camera, and host computer is connected by a cable 28.

[0036] The data acquisition and processing system 2 acquires the displacement data and vibration characteristics of the hot-rolled coil and reads in the expansion displacement algorithm 26 and centroid vibration algorithm 27, thereby realizing the monitoring of the expansion diameter and vibration of the hot-rolled coil.

[0037] Example 3

[0038] from Figure 1 , Figure 2 , Figure 3 As can be seen, the expansion diameter and vibration monitoring system of the present invention includes a displacement measurement unit comprising a contact displacement sensor 16, an integrated block 17, and a limiting member 18. The integrated block 17 includes a power supply 171, a signal transmission and data transmission module 172, and a transmitting antenna 173. The contact displacement sensor 16 and the integrated block 17 are both fixed on the upper part of the half coupling 12, and the limiting member 18 is fixed on the upper part of the connecting body 11. The axially telescopic measuring rod 161 of the contact displacement sensor 16 is connected to the limiting member 18, and the integrated block 17 is connected to the contact displacement sensor 16.

[0039] The contact displacement sensor 16 requires a pre-compression amount. When the expansion and contraction hydraulic cylinder 10 drives the mandrel 13 to move axially, the fan-shaped plate 14 is driven to expand or contract radially through the internal mechanism of the drum. At this time, the displacement data obtained by the axially telescopic measuring rod 161 is transmitted to the data wireless receiving and forwarding module 21 through the integrated block 17, and read into the expansion diameter displacement algorithm 26 in the "monitoring software" of the host computer 20 to obtain the expansion diameter of the hot-rolled drum, thereby realizing the monitoring of the expansion diameter.

[0040] Since the displacement measuring unit is installed on top of the half coupling 12, it does not need to be installed inside the rotary joint or with an additional measuring plate. The installation space is spacious, which will not cause abnormal damage to the displacement measuring unit, and the measurement values ​​are reliable.

[0041] Example 4

[0042] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As can be seen, in the expansion diameter and vibration monitoring system of the present invention: the vibration measurement feature component 19 is connected to the right end face of the extension shaft 15, and the camera 22 is set at a distance L from the end cover vibration measurement feature component 19; the end face of the vibration measurement feature component 19 opposite to the camera 22 has shape I 191 and shape II 192, shape I 191 is a circle or arc, and shape II 192 surrounds shape I 191.

[0043] Among them, shape I191 is corrected according to the outer circle of extension shaft 15 to ensure that the concentricity does not exceed 0.2mm.

[0044] Among them, shape II192 is a circle, a regular polygon, or other closed outline, and its function is to determine the cropping range of shape I191 for the obtained photographic image by the camera.

[0045] As the hot-rolled coil rotates, it experiences radial runout. The shapes I 191 and II 192 of the vibration measurement feature component 19 also run out of space along with the coil. At this time, the auxiliary module 23, in conjunction with the camera 22, captures images of shapes I 191 and II 192. The obtained vibration characteristics are transmitted through the controller 24 and the signal conditioning and data transmission module 25, and then read into the centroid vibration algorithm 27 in the "monitoring software" of the host computer 20. After data processing, the centroid position of shape I 191 during rotation is obtained. Since the position of this centroid is related to the vibration of the coil, the change in the centroid position reflects the vibration of the coil. The graph formed by connecting all the centroid points is the centroid motion trajectory. Further calculations of the motion trajectory data yield vibration-related characteristic parameters, thus enabling vibration monitoring.

[0046] The vibration measurement feature component 19 is directly installed at the vibrating part of the device of interest, i.e., near the sector plate 14, resulting in minimal interference and accurate reflection of the drum's vibration status. Furthermore, when the drum rotates, the vibration measurement feature component 19 rotates with it, preventing the signal cables of sensors from being broken due to drum rotation, thus ensuring reliable vibration monitoring.

[0047] Example 5

[0048] In the vibration measurement unit: the vibration measurement feature component 19 can be a single end cap 193, or it can be an assembly of end cap 193 and circular component 194.

[0049] from Figure 4 , Figure 5 , Figure 6 , Figure 7 It can be seen that when the vibration measurement feature component 19 is a single end cap 193, the specific shape of the end cap 193 is as follows:

[0050] 1. A protrusion B is provided on the end face A of the end cap 193. The outer contour of the protrusion B is shape I 191, and the outer contour of the end face A is shape II 192.

[0051] 2. A circular hole C is provided on the end face A of the end cap 193. The center of the circular hole C is concentric or eccentric with the center of the end cap 193. The outer contour of the circular hole C is shape I 191, and the outer contour of the end face A is shape II 192.

[0052] 3. A protrusion B is provided on the end face A of the end cap 193. A round hole C is provided on the protrusion B. The outer contour of the protrusion B is shape I 191, and the outer contour of the end face A is shape II 192.

[0053] from Figure 8 , Figure 9 , Figure 10 , Figure 11 It can be seen that when the vibration measurement feature component 19 is an assembly of end cap 193 and circular component 194, the specific shapes of end cap 193 and circular component 194 are as follows:

[0054] 1. A circular hole C is provided on the end face A of the end cap 193. The center of the circular hole C is concentric or eccentric with the center of the end cap 193. The outer contour of the circular hole C is shape I 191, and the outer contour of the end face A is shape II 192. The circular part 194 is embedded in the circular hole C.

[0055] 2. A protrusion B is provided on the end face A of the end cap 193. The outer contour of the protrusion B is a circle in shape I 191, and the outer contour of the end face A is shape II 192. The circular part 194 is a ring part, which is fitted over the protrusion B.

[0056] Example 6

[0057] Initialization methods for algorithm-related parameters in the monitoring system:

[0058] ① Before the drum is working, the vibration measurement feature component 19 is imaged and calibrated by the camera 22. The size of shape I 191 in the captured image is calibrated with its actual size to obtain the image scaling factor at distance L.

[0059] ② Based on the internal structural characteristics of the drum and their correlation, the theoretical formula for the linear relationship between the expansion diameter and the extension / retraction of the contact displacement sensor 8 is y = ax + b, where: the constant a is related to the internal structural characteristics of the drum (mainly the outer diameter of the mandrel); before the drum is working, the expansion and contraction hydraulic cylinder 10 drives the mandrel 13 to move axially through the loading system, while the sector plate 14 expands or contracts radially. The displacement of the radial expansion or contraction is the expansion diameter. The values ​​y of multiple expansion diameters are measured by measuring tools, and the actual value x of the axially extendable measuring rod 11 of the contact displacement sensor 1 is recorded for each expansion diameter. The data are linearly fitted to obtain the constant b;

[0060] ③ Input the correction coefficients a and b, image scaling coefficients, etc. as the corresponding parameters in the expansion displacement algorithm 26 and centroid vibration algorithm 27 in the monitoring software of the host computer 20.

[0061] In this way, when the hot-rolled coil 1 is working, as long as the displacement data of the axially telescopic measuring rod 11 and the vibration characteristics of the camera shape I191 are transmitted to the expansion displacement algorithm 26 and centroid vibration algorithm 27 in the monitoring software of the host computer 20, the data is accurate and reliable, and the expansion diameter and vibration of the hot-rolled coil can be monitored.

Claims

1. A monitoring system for the expansion diameter and vibration of hot-rolled coils, characterized by: It includes a hot-rolled coil (1) with a measuring structure and a data acquisition and processing system (2). The hot-rolled coil (1) includes an expansion and contraction hydraulic cylinder (10), a connecting body (11), a half coupling (12), a mandrel (13), a sector plate (14), an extension shaft (15), a displacement measuring unit, and a vibration measuring feature component (19). The left and right ends of the connecting body (11) are connected to the expansion and contraction hydraulic cylinder (10) and the support (3). The half coupling (12) is set in the mounting hole of the connecting body (11) to connect the piston of the expansion and contraction hydraulic cylinder (10) and the mandrel (13). The sector plate (14) is sleeved on the mandrel (10). 3) On the outside, the extension shaft (15) is connected to the end face of the mandrel (13), the displacement measurement unit is set on the half coupling (12), and the vibration measurement feature component (19) is connected to the extension shaft (15); the data acquisition and data processing system (2) is connected to the hot-rolled drum (1) with the measurement structure through the space medium to realize data transmission and feature acquisition under non-contact conditions; the data acquisition and data processing system (2) includes a host computer (20), a data wireless receiving and forwarding module (21), a camera (22), an auxiliary module (23), a controller (24), and a signal conditioning and data transmission module (25). The monitoring software in the host computer (20) contains a diameter displacement algorithm (26) and a centroid vibration algorithm (27); each module, unit, controller, camera, and host computer are connected by a cable (28); the displacement measurement unit includes a contact displacement sensor (16), an integrated block (17), and a limiting component (18). The integrated block (17) includes a power supply (171), a signal transmission and data transmission module (172), and a transmitting antenna (173); the contact displacement sensor (16) and the integrated block (17) are both fixed on the half coupling (12), and the limiting component (18) is fixed on the connecting body (11). Above, the axially telescopic measuring rod (161) of the contact displacement sensor (16) is connected to the limiting member (18), and the integrated block (17) is connected to the contact displacement sensor (16); the vibration measurement feature component (19) is connected to the right end face of the extension shaft (15), and the camera (22) is set at a distance L from the end cover vibration measurement feature component (19); the end face of the vibration measurement feature component (19) opposite to the camera (22) has shape I (191) and shape II (192), shape I (191) is a circle or arc, and shape II (192) surrounds shape I (191).

2. The expansion diameter and vibration monitoring system according to claim 1, characterized in that: Shape II (192) is a circle or a regular polygon or other closed outline.

3. The expansion diameter and vibration monitoring system according to claim 1, characterized in that: when When the vibration measurement feature component (19) is a single end cap (193), a protrusion B is provided on the end face A of the end cap (193), the outer contour of the protrusion B is shape I (191), and the outer contour of the end face A is shape II (192).

4. The expansion diameter and vibration monitoring system according to claim 1, characterized in that: when When the vibration measurement feature component (19) is a single end cap (193), a circular hole C is provided on the end face A of the end cap (193). The center of the circular hole C is concentric or eccentric with the center of the end cap (193). The outer contour of the circular hole C is shape I (191), and the outer contour of the end face A is shape II (192).

5. The expansion diameter and vibration monitoring system according to claim 1, characterized in that: when When the vibration measurement feature component (19) is an assembly of an end cap (193) and a circular part (194), a circular hole C is provided on the end face A of the end cap (193). The center of the circular hole C is concentric or eccentric with the center of the end cap (193). The outer contour of the circular hole C is shape I (191), and the outer contour of the end face A is shape II (192). The circular part (194) is embedded in the circular hole C.

6. The expansion diameter and vibration monitoring system according to claim 1, characterized in that: when When the vibration measurement feature component (19) is an assembly of an end cap (193) and a circular part (194), a protrusion B is provided on the end face A of the end cap (193), the outer contour of the protrusion B is a circle in shape I (191), and the outer contour of the end face A is shape II (192); the circular part (194) is a ring part, which is fitted outside the protrusion B.

7. The method for initializing algorithm-related parameters in the expansion diameter and vibration monitoring system of hot-rolled coils according to any one of claims 1-6, characterized in that: ① Before the drum is working, the vibration measurement feature component is imaged and calibrated by a camera. The size of shape I in the captured image is calibrated with its actual size to obtain the image scaling factor at distance L. ② Based on the internal structural characteristics of the drum and their correlation, the theoretical formula for the linear relationship between the expansion diameter and the extension / retraction of the contact displacement sensor is y=ax+b, where: the constant a is related to the internal structural characteristics of the drum; before the drum is working, the expansion and contraction hydraulic cylinder is driven by the loading system to move the spindle axially, while the sector plate expands or contracts radially. The displacement of radial expansion or contraction is the expansion diameter. The values ​​y of multiple expansion diameters are measured by measuring tools, and the actual value x of the axially extendable measuring rod of the contact displacement sensor is recorded at each expansion diameter. The data are linearly fitted to obtain the constant b; ③ Input the correction coefficients a and b, and the image scaling coefficient as the corresponding parameters in the expansion displacement algorithm and centroid vibration algorithm in the monitoring software of the host computer.

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