Cold-rolled sheet shape roll detecting device

Abstract

The application provides a cold-rolled sheet shape roller detection device, which comprises a center support shaft, a plurality of measuring rings are sleeved on the center support shaft along the axial direction of the center support shaft, both ends of each measuring ring are connected to the center support shaft through a bearing, a containing space is formed between each measuring ring and the center support shaft, a temperature sensor for detecting local temperature and a pressure sensor for dynamically abutting against the measuring ring to detect real-time pressure applied by a strip steel are arranged in the containing space, a gas supplement cavity fixed relative to the center support shaft is arranged in the containing space, an expansion air bag is arranged in the gas supplement cavity, the pressure sensor abuts against the expansion air bag, an air inlet channel along the axial direction of the center support shaft is arranged in the center support shaft, the air inlet channel is connected to a plurality of expansion air bags through a plurality of branch air tubes, and an electromagnetic valve is arranged on each branch air tube.

Description

Technical Field

[0001] This invention relates to the field of metallurgical rolling equipment technology, and in particular to a device for detecting the shape rolls of cold-rolled thin plates. Background Technology

[0002] In the cold-rolled sheet rolling process, the radial pressure applied to the strip along its width direction by shape rolls is typically detected, and the strip shape is determined based on the pressure differences at multiple measurement locations. Existing shape rolls generally have multiple independent measuring rings outside the central support shaft, with pressure sensors positioned between the measuring rings and the central support shaft. To ensure stable transmission of strip pressure to the pressure sensors, the pressure sensors are usually held in a fixed, pre-tightened state against the measuring rings. However, when the strip exhibits local waviness, folding, or sudden pressure changes, the real-time pressure on the measuring rings may exceed the pressure sensor's tolerance. The fixed support method makes it difficult for the measuring rings to retract radially in time, easily leading to excessive pressure on the pressure sensor. Simultaneously, the local temperature of the measuring rings and the central support shaft changes during rolling, and the resulting relative displacement alters the pre-tightening pressure between the pressure sensor and the measuring rings, causing deviations in the real-time pressure detected at different rolling stages. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned technical problems by providing a cold-rolled sheet shape roll detection device.

[0004] The technical solution of the present invention is a cold-rolled thin plate shape roll detection device, including a central support shaft. Multiple measuring rings, independently arranged and side-by-side along the central support shaft, are sleeved on the central support shaft. Each measuring ring's two ends are connected to the central support shaft via a bearing. A receiving space is formed between each measuring ring and the central support shaft. A temperature sensor for detecting local temperature and a pressure sensor dynamically abutting the measuring rings to detect the real-time pressure applied to the strip are provided within the receiving space. An air replenishment chamber fixed relative to the central support shaft is also provided within the receiving space. An expansion air bladder is provided within the air replenishment chamber, and the pressure sensor abuts against the expansion air bladder. An air intake channel along the central support shaft is opened inside the central support shaft. The air intake channel is connected to multiple expansion air bladders via multiple branch air pipes, and each branch air pipe is equipped with a solenoid valve. The temperature sensor, the pressure sensor, and the solenoid valve are all connected to the controller. The controller is used to adjust the air pressure in the corresponding expansion bladder according to the detection results of the pressure sensor and the temperature sensor, so that the measuring ring will radially retract when the pressure is overloaded, and to compensate for the change in the pre-tightening pressure of the pressure sensor caused by temperature changes.

[0005] In one embodiment, washers are provided on the central support shaft corresponding to the positions of each of the bearings, and the inner ring of the bearing is fitted onto the washers.

[0006] In one embodiment, each of the measuring rings has a bearing mounting port at both ends. A radial elastic support ring is provided between the outer ring of the bearing and the inner circumferential wall of the bearing mounting port. The outer ring of the bearing abuts against the inner circumferential wall of the bearing mounting port through the radial elastic support ring, so as to allow the measuring ring to generate radial displacement relative to the central support shaft.

[0007] In one embodiment, half of the bearing is fitted into the bearing mounting opening along its axial length, and the remaining half of the bearing extends out of the end face of the measuring ring.

[0008] In one embodiment, the pressure sensor is disposed on the side of the air supply chamber facing the measuring ring, with one side of the pressure sensor abutting against the inflatable air bladder and the other side dynamically abutting against the inner circumferential surface of the measuring ring.

[0009] In one embodiment, the solenoid valve is a three-way electromagnetic proportional valve, and the three ports of the three-way electromagnetic proportional valve are respectively connected to the intake channel, the corresponding expansion air bag, and the exhaust channel.

[0010] In one embodiment, the air intake end of the air intake channel is connected to a pressure stabilizing component, which is used to provide stable air pressure to the plurality of inflatable airbags.

[0011] In one implementation, each of the temperature sensors and the corresponding pressure sensors are respectively disposed in the same accommodating space, and form a one-to-one independent adjustment unit with the corresponding expansion airbag and the three-way electromagnetic proportional valve.

[0012] In one implementation, the controller stores preset pressure ranges corresponding to each of the pressure sensors and is used to control each of the three-way electromagnetic proportional valves to inflate or deflate the corresponding expansion bladders before the plate shape detection begins, so that the pre-tightening pressure of each of the pressure sensors is within the corresponding preset pressure range.

[0013] In one implementation, the controller is configured to: acquire the real-time pressure value detected by each pressure sensor after correction to the corresponding pre-tightening reference value and the local temperature value detected by the corresponding temperature sensor; when the real-time pressure value of any pressure sensor after correction to the corresponding pre-tightening reference value reaches a preset overload trigger condition, control the solenoid valve corresponding to that pressure sensor to vent, thereby reducing the air pressure in the corresponding expansion bladder, reducing the supporting effect of the expansion bladder on the pressure sensor, and causing the pressure sensor to radially retract towards the central support shaft along with the measuring ring; when the real-time pressure value after correction to the corresponding pre-tightening reference value does not reach the preset overload trigger condition, determine the air pressure compensation direction of the corresponding expansion bladder according to a pre-calibrated correspondence between local temperature change and pre-tightening pressure deviation, and control the corresponding solenoid valve to inflate or vent the expansion bladder to compensate for the relative displacement between the measuring ring and the central support shaft caused by temperature changes, so that the pre-tightening pressure of the pressure sensor on the measuring ring is maintained within a preset pressure range.

[0014] The advantages of this invention compared to existing technologies are that it incorporates an air-filling chamber and an expansion bladder between the central support shaft and each measuring ring, with the pressure sensor positioned against the expansion bladder. The air pressure within the corresponding expansion bladder is regulated via an air intake channel, branch air pipes, and a solenoid valve. When the pressure sensor detects a pressure overload, the air pressure within the expansion bladder decreases, allowing the pressure sensor and measuring rings to radially retract towards the central support shaft, reducing the supporting effect of the expansion bladder on the pressure sensor. When local temperature changes, the controller inflates or deflates the expansion bladder based on the detection results from the temperature and pressure sensors to compensate for the relative displacement between the measuring rings and the central support shaft caused by temperature changes. This maintains the pre-tightening pressure of the pressure sensor within a preset pressure range, thereby improving the stability of real-time pressure detection. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the cold-rolled thin plate shape roll detection device provided in the embodiments of the present invention; Figure 2 A partial cross-sectional view of the cold-rolled sheet shape roll detection device provided in an embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the cold-rolled sheet shape roll detection device provided in the document; Figure 4 A block diagram of the control circuit for a cold-rolled sheet shape roll detection device provided in an embodiment of the present invention.

[0016] In the diagram: 1. Central support shaft; 2. Measuring ring; 3. Bearing; 4. Accommodation space; 5. Temperature sensor; 6. Pressure sensor; 7. Air supply chamber; 8. Inflatable air bladder; 9. Air intake channel; 10. Branch air pipe; 11. Solenoid valve; 12. Controller; 13. Washer; 14. Bearing mounting port; 15. Radial elastic support ring; 16. Exhaust channel. Detailed Implementation

[0017] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In one implementation, such as Figure 1 and Figure 2As shown, the cold-rolled sheet roll inspection device includes a central support shaft 1, which serves as the mounting base for multiple measuring rings 2 and internal inspection components. Multiple measuring rings 2 are independently and side-by-side mounted on the outside of the central support shaft 1 along its axial direction, with a spacing between adjacent measuring rings 2 allowing each ring 2 to bear force independently. When the strip steel covers the outer circumference of the multiple measuring rings 2 and is conveyed along the roll, the tension differences in different areas of the strip steel's width direction act on the corresponding measuring rings 2, thereby forming localized radial pressure distributed along the axial direction of the central support shaft 1. Both ends of each measuring ring 2 are connected to the central support shaft 1 via bearings 3, allowing the measuring rings 2 to rotate relative to the central support shaft 1 during strip steel movement. An accommodating space 4 is formed between the inner circumferential surface of each measuring ring 2 and the outer circumferential surface of the central support shaft 1. The accommodating space 4 is used to install a temperature sensor 5, a pressure sensor 6, an air replenishment chamber 7, and an expansion air bladder 8. The accommodating spaces 4 corresponding to different measuring rings 2 are independent of each other, allowing the local pressure on each measuring ring 2 to be detected and adjusted separately, reducing mutual interference between adjacent detection positions. A temperature sensor 5 is installed within the accommodating space 4 to detect the local temperature near the corresponding measuring ring 2. A pressure sensor 6 dynamically abuts against the measuring ring 2 to detect the real-time pressure applied by the strip to that measuring ring 2. When the strip exerts a radial force on the measuring ring 2, this force is transmitted through the measuring ring 2 to the pressure sensor 6, which outputs a detection signal related to the strip pressure at the corresponding position. Based on the real-time pressure values ​​output by multiple pressure sensors 6, the controller 12 can obtain the force conditions at different positions along the width direction of the strip, providing basic data for strip shape detection. An air replenishment chamber 7, fixed relative to the central support shaft 1, is also provided within the accommodating space 4. The air replenishment chamber 7 is located on the side of the pressure sensor 6 facing the central support shaft 1. An expansion air bladder 8 is installed within the air replenishment chamber 7, and the pressure sensor 6 abuts against the expansion air bladder 8. After the inflatable airbag 8 is filled with gas, it provides support to the pressure sensor 6 towards the measuring ring 2, maintaining dynamic contact between the pressure sensor 6 and the measuring ring 2. When the air pressure inside the inflatable airbag 8 increases, its support for the pressure sensor 6 increases; when the air pressure inside the inflatable airbag 8 decreases, its support for the pressure sensor 6 decreases. Therefore, the inflatable airbag 8 serves both to establish the initial pre-tightening pressure of the pressure sensor 6 and to change the support state of the pressure sensor 6 on the measuring ring 2 through air pressure changes. An air intake channel 9 extending axially is provided inside the central support shaft 1, and the air intake channel 9 is connected to multiple inflatable airbags 8 via multiple branch air pipes 10. Each branch air pipe 10 is equipped with a solenoid valve 11, allowing the multiple inflatable airbags 8 to inflate or deflate independently. The temperature sensor 5, pressure sensor 6, and solenoid valves 11 are all connected to the controller 12, which adjusts the air pressure inside the corresponding inflatable airbag 8 based on the detection results of each pressure sensor 6 and temperature sensor 5.Under normal testing conditions, the inflatable air bladder 8 maintains a set air pressure, allowing the pressure sensor 6 to contact the measuring ring 2 with a corresponding pre-tightening pressure. The radial pressure applied by the strip can be transmitted to the pressure sensor 6 via the measuring ring 2. When the pressure on a certain measuring ring 2 is too high, the controller 12 controls the corresponding solenoid valve 11 to release air, reducing the air pressure inside the inflatable air bladder 8. This reduces the supporting effect at that position, allowing the measuring ring 2 and the pressure sensor 6 to radially retract towards the central support shaft 1, reducing the effect of excessive pressure on the pressure sensor 6. When the local temperature changes, the controller 12 can also compensate for the change in the pre-tightening pressure of the pressure sensor 6 caused by the temperature change by adjusting the air pressure inside the corresponding inflatable air bladder 8. Thus, the inflatable air bladder 8 serves both as a pressure support component for the pressure sensor 6 and as an actuator for overload retraction and pre-tightening pressure compensation.

[0019] In one implementation, such as Figure 2 As shown, washers 13 are respectively installed on the central support shaft 1 at the positions corresponding to each bearing 3, and the inner ring of the bearing 3 is fitted onto the washers 13. The washers 13 are located between the central support shaft 1 and the inner ring of the bearing 3, forming the mounting base surface of the bearing 3 and keeping each bearing 3 in its corresponding mounting position along the axial direction of the central support shaft 1. By setting the washers 13, the direct contact between the inner ring of the bearing 3 and the central support shaft 1 can be reduced, facilitating the assembly and replacement of the bearing 3, while keeping the multiple measuring rings 2 relatively independent along the axial direction.

[0020] In one implementation, such as Figure 2 As shown, each measuring ring 2 has a bearing mounting port 14 at both ends, and a radial elastic support ring 15 is provided between the outer ring of the bearing 3 and the inner circumferential wall of the bearing mounting port 14. The outer ring of the bearing 3 abuts against the inner circumferential wall of the bearing mounting port 14 through the radial elastic support ring 15. Under normal testing conditions, the radial elastic support ring 15 provides radial support to the measuring ring 2, keeping the measuring ring 2 in a relatively stable rotational position. When the measuring ring 2 is subjected to excessive radial pressure, the radial elastic support ring 15 can generate corresponding elastic deformation, thereby allowing the measuring ring 2 to produce a small radial displacement relative to the central support shaft 1. This radial displacement, combined with the reduced support effect formed after the inflation bladder 8 is deflated, provides a structural basis for the radial retraction of the measuring ring 2.

[0021] In one implementation, such as Figure 2As shown, half of the bearing 3's axial length is embedded in the bearing mounting opening 14, and the remaining half of the bearing 3's axial length extends out of the end face of the measuring ring 2. The portion of the bearing 3 embedded in the bearing mounting opening 14 forms a radial support for the end of the measuring ring 2, while the portion extending out of the end face of the measuring ring 2 mates with a corresponding mounting position on the central support shaft 1. This arrangement maintains a relatively compact axial length for the measuring ring 2 while providing sufficient mounting and support positions for the bearing 3, and facilitates the sequential arrangement of adjacent measuring rings 2 along the central support shaft 1.

[0022] In one implementation, such as Figure 2 As shown, pressure sensor 6 is positioned on the side of the air supply chamber 7 facing the measuring ring 2. The side of pressure sensor 6 facing the central support shaft 1 abuts against the inflatable airbag 8, and the side of pressure sensor 6 facing the measuring ring 2 dynamically abuts against the inner circumferential surface of the measuring ring 2. After the inflatable airbag 8 is inflated, it presses pressure sensor 6 against the inner circumferential surface of the measuring ring 2, creating an initial pre-tightening pressure between pressure sensor 6 and the measuring ring 2. When the measuring ring 2 experiences radial pressure from the strip, this pressure acts directly on pressure sensor 6; when the inflatable airbag 8 deflates, the supporting effect of pressure sensor 6 on the measuring ring 2 decreases, and it can radially retract as the measuring ring 2 moves towards the central support shaft 1.

[0023] In one implementation, such as Figure 3 As shown, the solenoid valve 11 is a three-way proportional solenoid valve, with its three ports connected to the intake channel 9, the corresponding inflation bladder 8, and the exhaust channel 16, respectively. When it is necessary to increase the air pressure inside the inflation bladder 8, the three-way proportional solenoid valve connects the intake channel 9 to the inflation bladder 8, allowing gas to enter the inflation bladder 8 through the branch air pipe 10; when it is necessary to decrease the air pressure inside the inflation bladder 8, the three-way proportional solenoid valve connects the inflation bladder 8 to the exhaust channel 16, allowing gas to be discharged from the inflation bladder 8. The three-way proportional solenoid valve can also adjust the inflation or deflation volume according to the control signal output by the controller 12, so that the air pressure inside the inflation bladder 8 can be gradually changed.

[0024] In one embodiment, the intake end of the air intake channel 9 is connected to a pressure stabilizing component (not shown in the figure), which provides a stable air pressure to the multiple inflatable airbags 8. Gas from an external air source enters the air intake channel 9 after being regulated by the pressure stabilizing component, and is then delivered to the corresponding inflatable airbag 8 via various branch air pipes 10. By limiting air pressure fluctuations entering the air intake channel 9 through the pressure stabilizing component, the impact of external air source pressure changes on each inflatable airbag 8 can be reduced, enabling the controller 12 to more stably adjust the air pressure within each inflatable airbag 8 according to the opening degree of the solenoid valve 11.

[0025] In one embodiment, each temperature sensor 5 and its corresponding pressure sensor 6 are housed within the same accommodating space 4, forming a one-to-one independent adjustment unit with the corresponding inflatable air bladder 8 and a three-way solenoid proportional valve. Each independent adjustment unit corresponds to a measuring ring 2, where the temperature sensor 5 detects the local temperature near the measuring ring 2, the pressure sensor 6 detects the real-time pressure on the measuring ring 2, the inflatable air bladder 8 provides support for the pressure sensor 6, and the three-way solenoid proportional valve adjusts the air pressure within the inflatable air bladder 8. Thus, pressure detection and air pressure adjustment for each measuring ring 2 can be performed independently.

[0026] In one embodiment, the controller 12 stores preset pressure ranges corresponding to each pressure sensor 6. With the device assembled and the measuring ring 2 not subjected to strip load, each measuring ring 2 is initially calibrated. The controller 12 adjusts the air pressure within the corresponding inflatable bladder 8 to bring the detection value of the pressure sensor 6 to a target preload value, records this target preload value as a preload reference value, and sets the preset pressure range based on this target preload value. The pressure boundary corresponding to the preset overload trigger condition is higher than the upper limit of the preset pressure range but lower than the allowable force limit of the pressure sensor 6. The controller 12 simultaneously records the local temperature value detected by the temperature sensor 5 during calibration, serving as the preset reference temperature for the corresponding measuring ring 2. Each measuring ring 2 can be set with the above parameters according to the range of the corresponding pressure sensor 6 and the assembly preload state. The unit of each pressure value is consistent with the output unit of the calibrated pressure sensor 6. Before the plate shape detection begins, the controller 12 sequentially or simultaneously reads the detection values ​​of each pressure sensor 6 and compares them with the corresponding preset pressure range. When the preload pressure of a pressure sensor 6 is lower than the corresponding preset pressure range, the controller 12 controls the corresponding three-way solenoid proportional valve to inflate the expansion bladder 8, thereby increasing the support of the expansion bladder 8 for the pressure sensor 6; when the preload pressure of a pressure sensor 6 is higher than the corresponding preset pressure range, the controller 12 controls the corresponding three-way solenoid proportional valve to vent, thereby reducing the preload pressure of the pressure sensor 6. Through independent adjustment before the start of the test, the preload pressure of each pressure sensor 6 is made to be within the corresponding preset pressure range. The original detection value of the pressure sensor 6 includes the preload load component formed by the expansion bladder 8 and the load component applied by the strip steel. In the calibration state where the measuring ring 2 is not subjected to strip steel load, the controller 12 records the preload reference value corresponding to each local temperature state and air pressure compensation state; during the plate shape detection process, the controller 12 subtracts the current preload reference value from the original detection value of the pressure sensor 6 to obtain the real-time pressure value applied by the strip steel, and performs plate shape detection and pressure overload judgment based on the real-time pressure value. After the solenoid valve 11 completes its inflation or deflation, the controller 12 updates the pre-tightening reference value according to a pre-calibrated correspondence. During the period when the solenoid valve 11 is activated and the pressure detection value is not yet stable, the output of the corresponding plate shape detection value of the measuring ring 2 is paused. During the no-load period when the strip is not in contact with the measuring ring 2, the controller 12 recalibrates the corresponding pre-tightening reference value.

[0027] In one implementation, such as Figure 4As shown, during the plate shape detection process, the controller 12 continuously acquires the real-time pressure values ​​detected by each pressure sensor 6 and the local temperature values ​​detected by the corresponding temperature sensor 5, and determines whether each independent adjustment unit needs to perform pressure overload relief or temperature compensation. The controller 12 processes the detection results corresponding to different measuring rings 2 separately, so that when a measuring ring 2 experiences pressure overload or local temperature change, it is not necessary to simultaneously change the air pressure of other inflatable bladders 8. When the real-time pressure value detected by any pressure sensor 6 reaches the preset overload trigger condition, the controller 12 prioritizes performing pressure overload relief. The preset overload trigger condition can be that the real-time pressure value reaches a set upper limit, or that the real-time pressure value increases rapidly within a continuous detection cycle and reaches the corresponding set condition. After the controller 12 determines that a pressure overload has occurred, it controls the solenoid valve 11 corresponding to the pressure sensor 6 to perform venting, thereby reducing the air pressure in the corresponding inflatable bladder 8. As the air pressure in the inflatable bladder 8 decreases, the supporting effect of the inflatable bladder 8 on the pressure sensor 6 decreases, and the pressure sensor 6 can radially retract towards the central support shaft 1 along with the measuring ring 2. Simultaneously, the radial elastic support rings 15 at both ends of the measuring ring 2 undergo elastic deformation to allow the measuring ring 2 to undergo corresponding radial displacement. By reducing the air pressure and coordinating with the radial elastic supports, the excessive pressure continuously acting on the pressure sensor 6 can be reduced.

[0028] When the real-time pressure value does not reach the preset overload trigger condition, the controller 12 does not perform the aforementioned pressure overload venting. Instead, it determines the pressure compensation direction of the corresponding expansion airbag 8 based on the change in the local temperature value detected by the temperature sensor 5 relative to the preset reference temperature. During the rolling process, the measuring ring 2, the central support shaft 1, and the mounting components between them may experience relative displacement due to local temperature changes, causing the pre-tightening pressure of the pressure sensor 6 on the measuring ring 2 to deviate from the preset pressure range. The pressure compensation direction is not determined solely based on the direction of local temperature increase or decrease, but rather on a pre-calibrated correspondence between local temperature changes and pre-tightening pressure deviations. During calibration, with the measuring ring 2 not subjected to strip load, the deviations of the detection values ​​of the pressure sensor 6 relative to the target pre-tightening value are recorded under multiple local temperature conditions, forming a correspondence between local temperature changes and pre-tightening pressure deviations. During operation, when the correspondence indicates that the pre-tightening pressure is lower than the preset pressure range, the controller 12 controls the corresponding solenoid valve 11 to inflate the expansion airbag 8; when the correspondence indicates that the pre-tightening pressure is higher than the preset pressure range, the controller 12 controls the corresponding solenoid valve 11 to vent the expansion airbag 8. During inflation or deflation, the controller 12 continues to acquire the real-time pressure value from the pressure sensor 6. When the pre-tightening pressure of the pressure sensor 6 on the measuring ring 2 returns to the preset pressure range, the controller controls the corresponding solenoid valve 11 to stop inflation or deflation. Through the above control process, when the real-time pressure value reaches the preset overload trigger condition, the controller 12 prioritizes reducing the supporting effect of the inflatable bladder 8, causing the measuring ring 2 and the pressure sensor 6 to form radial retraction. When no pressure overload occurs, the controller compensates for the inflation or deflation of the inflatable bladder 8 according to local temperature changes, keeping the pre-tightening pressure of the pressure sensor 6 within the preset pressure range. Thus, the same inflatable bladder 8 and solenoid valve 11 are used for both radial retraction during pressure overload and pre-tightening pressure compensation during temperature changes, eliminating the need for two separate adjustment structures.

[0029] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cold-rolled thin plate shape roll detection device, characterized in that, The device includes a central support shaft, on which multiple measuring rings are independently arranged and side-by-side along its axial direction. Each measuring ring has its two ends connected to the central support shaft via a bearing. A receiving space is formed between each measuring ring and the central support shaft. The receiving space contains a temperature sensor for detecting local temperature and a pressure sensor that dynamically abuts against the measuring rings to detect real-time pressure applied by the strip. The receiving space also contains a replenishing air chamber fixed relative to the central support shaft, containing an expansion airbag. The pressure sensor abuts against the expansion airbag. An air intake channel is opened inside the central support shaft along its axial direction. The air intake channel is connected to multiple expansion airbags via multiple branch air pipes, each of which is equipped with a solenoid valve. The temperature sensor, the pressure sensor, and the solenoid valve are all connected to the controller. The controller is used to adjust the air pressure in the corresponding expansion bladder according to the detection results of the pressure sensor and the temperature sensor, so that the measuring ring will radially retract when the pressure is overloaded, and to compensate for the change in the pre-tightening pressure of the pressure sensor caused by temperature changes.

2. The cold-rolled thin plate shape roll detection device according to claim 1, characterized in that, Washers are provided on the central support shaft at the positions corresponding to each of the bearings, and the inner ring of the bearing is fitted onto the washers.

3. The cold-rolled thin plate shape roll detection device according to claim 1, characterized in that, Each of the measuring rings has a bearing mounting port at both ends. A radial elastic support ring is provided between the outer ring of the bearing and the inner circumferential wall of the bearing mounting port. The outer ring of the bearing abuts against the inner circumferential wall of the bearing mounting port through the radial elastic support ring, so as to allow the measuring ring to generate radial displacement relative to the central support shaft.

4. The cold-rolled thin plate shape roll detection device according to claim 3, characterized in that, The bearing is fitted into the bearing mounting port at half its axial length, and the remaining half of the bearing extends out of the end face of the measuring ring.

5. The cold-rolled thin plate shape roll detection device according to claim 1, characterized in that, The pressure sensor is located on the side of the air supply chamber facing the measuring ring. One side of the pressure sensor abuts against the inflatable air bladder, and the other side dynamically abuts against the inner circumferential surface of the measuring ring.

6. The cold-rolled thin plate shape roll detection device according to claim 1, characterized in that, The solenoid valve is a three-way solenoid proportional valve, and the three ports of the three-way solenoid proportional valve are respectively connected to the intake channel, the corresponding expansion air bag, and the exhaust channel.

7. The cold-rolled sheet shape roll detection device according to claim 6, characterized in that, The air intake end of the air intake channel is connected to a pressure stabilizing component, which is used to provide stable air pressure to the multiple inflatable airbags.

8. The cold-rolled sheet shape roll detection device according to claim 6, characterized in that, Each of the temperature sensors and the corresponding pressure sensors are respectively disposed in the same accommodating space, and together with the corresponding expansion airbag and the three-way electromagnetic proportional valve, they form a one-to-one independent adjustment unit.

9. The cold-rolled sheet shape roll detection device according to claim 6, characterized in that, The controller stores preset pressure ranges corresponding to each of the pressure sensors and is used to control each of the three-way electromagnetic proportional valves to inflate or deflate the corresponding expansion bladders before the plate shape detection begins, so that the pre-tightening pressure of each of the pressure sensors is within the corresponding preset pressure range.

10. The cold-rolled sheet shape roll detection device according to claim 9, characterized in that, The controller is configured to: acquire the real-time pressure value detected by each pressure sensor after correction to the corresponding pre-tightening reference value and the local temperature value detected by the corresponding temperature sensor; when the real-time pressure value of any pressure sensor after correction to the corresponding pre-tightening reference value reaches a preset overload trigger condition, control the solenoid valve corresponding to that pressure sensor to vent, thereby reducing the air pressure in the corresponding expansion bladder, reducing the supporting effect of the expansion bladder on the pressure sensor, and causing the pressure sensor to radially retract towards the central support shaft along with the measuring ring; when the real-time pressure value after correction to the corresponding pre-tightening reference value does not reach the preset overload trigger condition, determine the air pressure compensation direction of the corresponding expansion bladder according to the pre-calibrated correspondence between local temperature change and pre-tightening pressure deviation, and control the corresponding solenoid valve to inflate or vent the expansion bladder to compensate for the relative displacement between the measuring ring and the central support shaft caused by temperature change, so that the pre-tightening pressure of the pressure sensor on the measuring ring is maintained within a preset pressure range.

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