Projection shaft dynamic deflection detection device and method based on laser displacement sensor

Abstract

The invention relates to the technical field of carbon fiber chemical equipment, and particularly discloses a laser displacement sensor-based extending roll shaft dynamic deflection detection device, which comprises a roll shaft sleeve, a pressing rod, a laser displacement sensor, an air cylinder and a PLC (Programmable Logic Controller), the roller shaft sleeve and the box body end of the to-be-measured roller shaft are concentrically assembled, the laser displacement sensor is fixedly arranged on the pressing rod and is parallel to the axial direction of the to-be-measured roller shaft, and real-time deflection data are analyzed and processed by the PLC; a cylinder drives a pressure rod to dynamically adjust a measurement point position, and the pressure and stroke of the cylinder are controlled in combination with an online feedback closed loop, so that the deflection value is monitored in real time; when the deflection value is detected to exceed a safety threshold value, the PLC triggers an alarm function, timely shutdown detection is carried out, the use safety of the device is improved, the device is compatible with multi-specification roller diameter detection, the universality is high, and the deformation monitoring efficiency and reliability of the roller shaft of the carbon fiber production line are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of carbon fiber precursor equipment, and in particular to a device and method for detecting the dynamic deflection of an extended shaft based on a laser displacement sensor. Background Art

[0002] Carbon fiber is a high-strength, high-modulus fiber made from polyacrylonitrile (PAN) fiber, viscose fiber or asphalt fiber as the raw silk, which is made by heating to remove all elements except carbon.

[0003] The carbon fiber precursor production process involves spinning dope through a spinneret into a coagulation bath, where the tow is formed. The tow then passes through a washing and drawing unit to remove impurities and solvent from the surface of the tow. The tow then passes through the oiling and drying rollers of an oiling and drying machine, where the surface of the tow is oiled and dried, improving its bundling, wear resistance, and water absorption resistance.

[0004] The drafting rollers of the water-washing drafting unit, the oiling rollers and the drying rollers of the oiling dryer are all installed with one end fixed and the other end cantilevered. In addition, the outer diameters and qualities of the multiple rollers vary greatly. Therefore, the deflection is also inconsistent, making it difficult to ensure the parallelism of the multiple protruding rollers, affecting the drafting, oiling and drying effects of the yarn bundles and reducing the mechanical properties of the raw yarn.

[0005] Currently, there are two methods for measuring the deflection of the extension roller. One is to lift the cantilever end through the jacking device to be collinear with the axis of the fixed end, then place the micrometer at 0 scale under the extension shaft, remove the jacking device, and the value displayed by the micrometer is the deflection value. The angle of rotation is calculated based on the deflection value. Similarly, the deflection values ​​of other extension rollers are measured in the same way. According to the difference in the angle of rotation, the position of the roller is adjusted to ensure the parallelism of multiple extension rollers. The other method is to use a three-coordinate measuring instrument to select different points on the extension roller and calculate it on a computer.

[0006] Both of the above methods measure the deflection value of the extension roller in a static working state, and cannot measure the extension roller installed at a high position. In addition, the first method requires a lot of equipment for measurement, which is time-consuming and labor-intensive. The second method requires a large three-coordinate measuring instrument, which needs to be moved manually to measure different rollers, and the base needs to be leveled and fixed, which is costly and difficult to operate.

[0007] Therefore, in order to solve the above technical problems, it has become an urgent technical problem to explore and break through the existing method of measuring the deflection of the extension roller and improve the mechanical properties of the raw silk. Summary of the Invention

[0008] In order to overcome the limitations of existing technologies, reduce operational difficulty, improve measurement accuracy, and enhance the mechanical properties of raw silk, the present application provides a device and method for detecting the dynamic deflection of an extended shaft based on a laser displacement sensor, which adopts the following technical solutions:

[0009] The cam is secured to the rear of the roll shaft and is adapted to engage said guide rails, wherein the cam is secured to a position adjacent to the roll shaft and adapted to engage said guide rails.

[0010] By adopting the above technical solution, the roller sleeve is fixed to the box where the extension roller is mounted, and the inner diameter of the roller sleeve is larger than the diameter of the extension roller, preventing contact between the roller and the roller sleeve. The actuator drives the pressure rod to drive the laser displacement sensor in a reciprocating motion up and down for multi-point distance measurement. The deflection value of the extension roller can be calculated based on the displacement difference of the pressure rod and the measured distance of the laser displacement sensor. Since the laser displacement sensor is connected to the PLC controller, when the measured distance is greater than the length of the extension roller, the actuator is controlled to adjust the displacement of the pressure rod to achieve precise control. In addition, the actuator controls the position of the pressure rod to avoid contact between the pressure rod and the extension roller, preventing frictional resistance caused by the extension roller during rotation. Non-contact laser beam ranging avoids affecting the rotation of the extension roller, and the deflection value of the extension roller can be dynamically monitored. The bending deformation of the extension roller is monitored in real time, which can promptly detect abnormal deflection and prevent sudden failure. When the deflection value exceeds the safety threshold, the PLC controller triggers an alarm function, shutting down the machine for timely detection, thereby improving equipment safety.

[0011] Optionally, the execution assembly includes an execution frame and a driving member that drives the execution frame to move back and forth up and down, the execution frame includes a first plug-in portion and a second plug-in portion, and the pressure rod is provided with a first accommodating groove connected to the first plug-in portion, and a second accommodating groove connected to the second plug-in portion, the first accommodating groove is a V-shaped groove, and the second accommodating groove is a square flat groove.

[0012] By adopting the above technical solution, the first accommodating groove is a V-shaped groove, and the second accommodating groove is a square flat groove. The V-shaped groove is used to limit the radial movement of the first plug-in part, and the V-shaped groove disperses the load through symmetrical contact, reduces local stress concentration, avoids deformation of the execution frame, and has high connection reliability. The setting of the square groove makes the second accommodating groove a free end. When the position of the first plug-in part is determined, the position of the second plug-in part can be determined. The setting of the square groove reduces the manufacturing error of the execution frame, and the installation reliability is high. The V-shaped groove has an automatic centering function to reduce clamping time.

[0013] Optionally, the angle of the first accommodating groove is 60 to 90 degrees, the length of the second accommodating groove along the length direction of the pressure rod is greater than the length of the second plug-in part, and the width of the second accommodating groove along the length direction of the extended roller shaft is equal to the width of the second plug-in part.

[0014] By adopting the above technical solution, the setting of the angle of the accommodating groove can, on the one hand, improve the connection reliability of the first plug-in part, and on the other hand, ensure the convenience of assembly and disassembly of the first plug-in part; the width of the second accommodating groove.

[0015] Optionally, the laser displacement sensor is installed in the middle of the pressure rod close to the center of the roller sleeve.

[0016] By adopting the above technical solution, the distance between the laser displacement sensor and the extended roller to be measured is reduced, the probability that the position of the laser displacement sensor is greater than the deflection value of the extended roller is reduced, and the deflection measurement accuracy is improved.

[0017] Optionally, a boss is fixed to the upper mounting portion of the roller sleeve, and the actuator also includes a support plate, which is close to the side of the roller sleeve and is connected to a limit sleeve that accommodates the boss. The driving member is installed on the side of the support plate away from the roller sleeve, and the force center of the driving member passes through the axis of the limit sleeve.

[0018] By adopting the above technical solution, the limiting sleeve is arranged in the convex column to realize the positioning of the execution frame, so that the support frame is symmetrically arranged on both sides of the roller sleeve, and the force axis of the driving member is consistent with the axis of the limiting sleeve, thereby improving the uniformity of the force on the support frame and improving the accuracy of detection.

[0019] Optionally, the driving member is a cylinder, a screw is provided on the side of the support plate away from the roller sleeve, and the cylinder is threadedly connected to the screw.

[0020] By adopting the above technical solution, the driving part is a cylinder, and the displacement of the actuator is controlled by controlling the air intake of the cylinder. The PLC controller adjusts the moving distance of the actuator according to the displacement measured by the laser displacement sensor, and intelligent measurement and control are achieved with higher accuracy.

[0021] Optionally, a connecting flange is provided on the elastic member, and a connecting sleeve is provided on the lower mounting portion. The connecting flange and the connecting sleeve are detachably connected, and the connection length of the connecting flange is smaller than the length of the connecting sleeve.

[0022] By adopting the above technical solution, one end of the elastic member is fixed on the connecting flange, and the connecting flange and the connecting sleeve are detachably connected, which is convenient for disassembly. The connection height of the connecting flange is less than the height of the connecting sleeve, ensuring the reliability of the connection.

[0023] Optionally, the elastic member is a compression spring, the depth of the cavity is greater than the free extension of the compression spring, and when the compression spring is in a free state, the upper end surface of the pressure rod away from the compression spring is higher than the lower vertex of the extended roller shaft.

[0024] By adopting the above technical solution, it can be ensured that when the pressure rod is tangent to the extended roller to be measured, the compression spring is in a compressed state, ensuring that the position of the laser displacement sensor can be close to and directly below the extended roller to be measured.

[0025] Optionally, the distance between the height of the pressure rod when it is at the upper limit position of the adjustment hole and the axis of the extension roller is smaller than the radius of the extension roller.

[0026] By adopting the above technical solution, the moving position of the pressure rod is ensured to be tangent to the measured extended roller shaft, and the length range of the adjustment hole can be used to measure the diameters of different extended roller shafts, making the deflection detection device more versatile.

[0027] The method for measuring and controlling the dynamic deflection of the extended shaft based on the laser displacement sensor is as follows: S1. The roller sleeve and the extended roller to be measured are installed on the box body concentrically, and the length direction of the lower installation part of the roller sleeve is the vertical direction; S2. The pressure rod is inserted into the two adjustment holes, and the light beam direction of the laser displacement sensor is consistent with the cantilever direction of the extended roller; S3. The compression spring is installed in the cavity, and the connecting flange is connected to the roller sleeve. Under the action of the compression spring, the pressure rod is tangent to the extended roller; S4. The limiting sleeve of the execution frame is installed in the convex column of the roller sleeve. A plug-in portion is installed in the first receiving groove, and the second plug-in portion is installed in the second receiving groove. The cylinder is fixed to the box body and is used to drive the execution frame to reciprocate up and down; S5, take two measuring points in the effective range, and measure the distances L1 and L2 of the two measuring points in the length direction through the laser displacement sensor, and obtain the vertical displacement y value of the two measuring points according to the pushing distance of the cylinder. The rotation angle of the extended roller shaft can be calculated as a=arctan(y / (L2-L1)); when the rotation angle of the roller shaft is greater than the safety threshold value, the PLC controller triggers the alarm function and stops the machine for detection in time.

[0028] By adopting the above technical solution, the device drives the pressure rod to move up and down along the length direction of the adjustment hole through the cylinder to control the displacement height of the laser displacement sensor. The length measured by the laser displacement sensor is fed back to the PLC controller. The PLC controller adjusts the cylinder air intake according to the measurement results, controls the detection point of the laser displacement sensor, and improves the detection accuracy.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. Through non-contact laser beam ranging, the impact on the extension roller's rotation is avoided, achieving non-destructive testing; by dynamically monitoring the extension roller's deflection value and real-time monitoring of the extension roller's bending deformation, abnormal deflection can be discovered in time to prevent sudden failures;

[0031] 2. Real-time deflection data is connected to the PLC controller. When the deflection detection is invalid, the cylinder air intake is controlled and the detection position of the laser displacement sensor is adjusted. Through online feedback control, the cylinder operating parameters are dynamically adjusted to improve the deflection detection accuracy. When the deflection value exceeds the safety threshold, the PLC controller triggers the alarm function and stops the machine for detection in time, thereby improving the safety of equipment use.

[0032] 3. The length range of the adjustment hole can be used to measure the diameters of different extended rollers, making the deflection detection device more versatile;

[0033] 4. This detection device breaks the limitation of traditional technical means that contact measurement cannot achieve dynamic monitoring, and has strong adaptability to installation space;

[0034] 5. The first receiving groove is a V-shaped groove, which is used to limit the radial movement of the first plug-in part. The V-shaped groove disperses the load through symmetrical contact, reduces local stress concentration, avoids deformation of the actuator, and has high connection reliability. The second receiving groove is a square flat groove, so that the second receiving groove is a free end. When the position of the first plug-in part is determined, the position of the second plug-in part can be determined. The setting of the square flat groove reduces the manufacturing error of the actuator and has high installation reliability. The V-shaped groove has an automatic centering function, which reduces the clamping time.

[0035] 6. The device has the advantages of unique structure, safety, reliability, high efficiency, green environmental protection and low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the measurement principle of the deflection detection device.

[0037] Figure 2 It is a structural schematic diagram of a deflection detection device installed on a protruding roller to be tested.

[0038] Figure 3 It is a structural diagram of the deflection detection device.

[0039] Figure 4 It is a schematic diagram of the cross-sectional structure of the deflection detection device.

[0040] Figure 5 yes Figure 4 X is a partial enlarged schematic diagram.

[0041] Figure 6 yes Figure 4 A partially enlarged schematic diagram of Y.

[0042] Description of reference numerals:

[0043] 1. Roller sleeve; 11. Upper mounting part; 12. Lower mounting part; 121. Cavity; 122. Adjustment hole; 13. Boss; 14. Connecting sleeve; 2. Compression spring; 21. Connecting flange; 3. Pressure rod; 31. First accommodating groove; 32. Second accommodating groove; 4. Actuator assembly; 41. Actuator frame; 411. First plug-in part; 412. Second plug-in part; 42. Support plate; 421. Limit sleeve; 422. Screw; 43. Cylinder; 5. Laser displacement sensor. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-6 This application is described in further detail.

[0045] The embodiment of the present application discloses a device and method for detecting dynamic deflection of an extended shaft based on a laser displacement sensor.

[0046] Reference Figure 1 and Figure 2 ,

[0047] The laser displacement sensor-based dynamic deflection detection device for an extended shaft includes a roller sleeve 1, an elastic member, a pressure rod 3, a laser displacement sensor 5, an actuator 4, and a PLC controller. The roller sleeve 1 is mounted on the extended roller to be tested and fixedly connected to the housing. The roller sleeve 1 is concentrically positioned with the extended roller to be tested, near the housing, and the inner diameter of the roller sleeve 1 is larger than the outer diameter of the roller to be tested. The pressure rod 3 is tangent to the maximum diameter of the lower half of the extended roller to be tested. The laser displacement sensor 5 is mounted on the pressure rod 3 and parallel to the length of the roller to be tested. The laser displacement sensor 5 and the actuator 4 are connected to the PLC controller (specifically, the cylinder 43 of the actuator 4 is electrically connected to the PLC controller). The elastic member is mounted within the roller sleeve 1. The actuator 4 is used to control the pressure rod 3 to adjust the distance radially away from the extended roller to be tested, allowing the laser displacement sensor 5 to take different measurement points. The PLC controller derives the rotational angle of the roller to be tested based on the measurement data from the different measurement points.

[0048] When the laser displacement sensor 5's measurement interval falls within the range between measurement points A and B, the point is considered valid. Based on the longitudinal distances L1 and L2 of measurement points 1 and 2, and the vertical displacement y value of measurement points 1 and 2 obtained based on the distance traveled by cylinder 43, the rotation angle of the extension roller can be calculated as a = arctan(y / (L2-L1)). When the roller's rotation angle exceeds the safety threshold, the PLC controller triggers an alarm and promptly shuts down the machine for testing. When the measurement point is outside measurement point B, that is, when it reaches measurement point 3, the point is considered invalid. At this point, the PLC controller controls the actuator 4 to drive the pressure rod 3 toward the axis of the extension roller to be measured until it is within the range between measurement points A and B, ensuring the validity of the measurement point.

[0049] This device uses non-contact laser beam ranging to dynamically monitor the deflection of the extended roller under test. This real-time monitoring of the roller's bending deformation allows for timely detection of abnormal deflection and prevents unexpected failures. If the deflection exceeds the safety threshold, the PLC controller triggers an alarm, shutting down the machine for immediate testing and improving equipment safety. This detection device overcomes the limitations of traditional contact-based measurement methods, which lack dynamic monitoring capabilities, and offers strong adaptability to installation spaces.

[0050] Specifically,

[0051] Reference Figure 3 and Figure 4 ,

[0052] The roller sleeve 1 has an inverted U-shaped symmetrical structure, including an upper mounting portion 11 and two lower mounting portions 12. The upper mounting portion 11 is located on the side close to the upper circumference of the extended roller to be measured. The upper mounting portion 11 is welded with a boss 13, and the lower mounting portion 12 is provided with a cavity 121 for accommodating an elastic member. The elastic member is a compression spring 2, and the depth of the cavity 121 is greater than the free elongation of the compression spring 2.

[0053] A connecting flange 21 is fixed to the side of the compression spring 2 away from the roller sleeve 1. A connecting sleeve 14 is provided on the lower mounting portion 12. The connecting flange 21 is sleeved within the connecting sleeve 14. The connecting flange 21 and the connecting sleeve 14 are threadedly connected, and the connection length of the connecting flange 21 is less than the thread length of the connecting sleeve 14 to ensure that the connecting flange 21 is fully screwed into the connecting sleeve 14, ensuring a reliable connection. The connecting flange 21 and the connecting sleeve 14 are detachably connected, making assembly and disassembly easy.

[0054] The lower mounting portion 12 is provided with a through adjustment hole 122 on one side perpendicular to the axis of the extending roller to be measured. The pressure rod 3 is inserted into the two adjustment holes 122 of the lower mounting portion 12 and is slidably connected to the two adjustment holes 122. The laser displacement sensor 5 is detachably connected to the middle portion of the pressure rod 3, near the side of the extending roller to be measured. When the compression spring 2 is in a free state, the upper end surface of the pressure rod 3 on the side away from the compression spring 2 should be higher than the lower vertex of the extending roller. When the pressure rod 3 is tangent to the extending roller to be measured, the compression spring 2 is in a compressed state, ensuring that the laser displacement sensor 5 is positioned close to and directly below the extending roller to be measured, thereby improving the effectiveness of the measurement point.

[0055] Adjustment hole 122 is oriented parallel to the direction of movement of pressure rod 3. The range of lengths of adjustment hole 122 allows for measuring the diameters of different extension rollers, making the deflection detection device more versatile. When adjustment hole 122 is in the upper limit position, its height from the axis of the extension roller is less than the radius of the extension roller, ensuring that the movement of pressure rod 3 is tangential to the extension roller being measured, facilitating detection of the measurement point.

[0056] Reference Figure 4 、 Figure 5 and Figure 6 ,

[0057] The actuator assembly 4 includes an actuator frame 41, a driving member and a support plate 42. The actuator frame 41 is fixed on both sides of the support plate 42 and is equidistant from the center of the actuator frame 41. The driving member is a cylinder 43, which is used to drive the actuator frame 41 to reciprocate up and down. The displacement of the actuator frame 41 is controlled by controlling the air intake of the cylinder 43. The PLC controller adjusts the moving distance of the actuator frame 41 according to the displacement measured by the laser displacement sensor 5, realizing intelligent measurement and control with higher precision.

[0058] Specifically,

[0059] The execution frame 41 includes a first plug-in portion 411 and a second plug-in portion 412. A first accommodating groove 31 connected to the first plug-in portion 411 is provided on the pressure rod 3. The first accommodating groove 31 is a V-shaped groove. The V-shaped groove is used to limit the radial movement of the first plug-in portion 411, and the V-shaped groove disperses the load through symmetrical contact, reduces local stress concentration, avoids deformation of the execution frame 41, and has high connection reliability; the second accommodating groove 32 connected to the second plug-in portion 412, the second accommodating groove 32 is a square flat groove, so that the second accommodating groove 32 is a free end. When the position of the first plug-in portion 411 is determined, the position of the second plug-in portion 412 can be determined. The setting of the square groove reduces the manufacturing error of the execution frame 41, and the installation reliability is high. The V-shaped groove has an automatic centering function to reduce clamping time.

[0060] The included angle of the first accommodating groove 31 is 60 to 90 degrees. On the one hand, it improves the connection reliability of the first plug-in part 411, and on the other hand, it ensures the convenience of assembly and disassembly of the first plug-in part 411; the length of the second accommodating groove 32 along the length direction of the pressure rod 3 is greater than the length of the second plug-in part 412, and the width of the second accommodating groove 32 along the length direction of the extending roller shaft is equal to the width of the second plug-in part 412.

[0061] A limiting sleeve 421 is provided on the side of the support plate 42 near the roller sleeve 1. The limiting sleeve 421 is sleeved on the boss 13 and moves up and down along the length of the boss 13. The limiting sleeve 421 is arranged so that the first plug-in portion 411 and the second plug-in portion 412 are symmetrically arranged on both sides of the roller sleeve 1, which is used to position the actuator 41. A screw 422 is welded to the side of the support plate 42 away from the limiting sleeve 421. The axis of the screw 422 is collinear with the axis of the fiber sleeve. The cylinder 43 is threadedly connected to the screw 422, which can make the force center of the cylinder 43 pass through the axis of the limiting sleeve 421, thereby improving the uniformity of the force applied to the support frame and improving the accuracy of the detection.

[0062] The present application line provides a device and method for detecting dynamic deflection of an extended shaft based on a laser displacement sensor, which is divided into five steps:

[0063] The first step is to install the roller sleeve 1 and the extended roller to be tested concentrically on the box body, with the length direction of the lower mounting portion 12 of the roller sleeve 1 being in the vertical direction;

[0064] The second step is to insert the pressure rod 3 into the two adjustment holes 122 so that the beam direction of the laser displacement sensor 5 is consistent with the direction of the cantilever extending from the roller shaft;

[0065] The third step is to install the compression spring 2 into the cavity 121 and connect the connecting flange 21 to the roller sleeve 1. Under the action of the compression spring 2, the pressure rod 3 is tangent to the extended roller shaft.

[0066] Step 4: Sleeve the limiting sleeve 421 of the actuator 41 into the boss 13 of the roller sleeve 1, install the first plug-in portion 411 into the first receiving groove 31, and install the second plug-in portion 412 into the second receiving groove 32. The cylinder 43 is fixed to the box and is used to drive the actuator 41 to reciprocate up and down.

[0067] Step 5, S5, takes two measuring points within the effective range, and measures the distances L1 and L2 of the two measuring points in the length direction through the laser displacement sensor 5, and obtains the displacement y value of the two measuring points in the vertical direction according to the pushing distance of the cylinder 43. The rotation angle of the extended roller can be calculated as a=arctan(y / (L2-L1)); when the rotation angle of the roller is greater than the safety threshold value, the PLC controller triggers the alarm function and stops the machine for detection in time.

[0068] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for detecting dynamic deflection of an extended shaft based on a laser displacement sensor, characterized in that: It comprises a roller sleeve (1) fixed on a box body, an elastic member embedded in the roller sleeve (1), and an actuator assembly (4); The roller sleeve (1) is sleeved on one side of the fixed end of the extended roller shaft, and the inner diameter of the roller sleeve (1) is larger than the outer diameter of the extended roller shaft; The roller sleeve (1) comprises an upper mounting portion (11) and two lower mounting portions (12) away from the upper mounting portion (11), and both lower mounting portions (12) are provided with a cavity (121) for accommodating an elastic member; The elastic member is fixed to the roller sleeve (1) at one end away from the upper mounting portion (11), and a pressure rod (3) is provided at one end of the elastic member close to the upper mounting portion (11). Adjustment holes (122) for accommodating the pressure rod (3) are provided in the length direction of the two lower mounting portions (12), and the pressure rod (3) is connected to the two adjustment holes (122) by sliding up and down. The actuator (4) is used to drive the pressure rod (3) to perform up and down reciprocating motion along the two adjustment holes (122); a laser displacement sensor (5) is provided on the pressure rod (3); the light beam direction of the laser displacement sensor (5) is consistent with the axial direction of the roller sleeve (1), and the laser displacement sensor (5) is located directly below the axis of the roller sleeve (1); the laser displacement sensor (5) and the actuator (4) are respectively electrically connected to a PLC controller.

2. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 1, characterized in that: The execution assembly (4) includes an execution frame (41) and a driving member for driving the execution frame (41) to move back and forth up and down. The execution frame (41) includes a first plug-in portion (411) and a second plug-in portion (412). The pressure rod (3) is provided with a first receiving groove (31) connected to the first plug-in portion (411) and a second receiving groove (32) connected to the second plug-in portion (412). The first receiving groove (31) is a V-shaped groove, and the second receiving groove (32) is a square flat groove.

3. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 2, characterized in that: The length of the second accommodating groove (32) along the length direction of the pressure rod (3) is greater than the length of the second plug-in portion (412), and the width of the second accommodating groove (32) along the length direction of the extension roller shaft is equal to the width of the second plug-in portion (412).

4. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 3, characterized in that: The laser displacement sensor (5) is installed in the middle of the pressure rod (3) close to the center of the roller sleeve (1).

5. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 4, characterized in that: The upper mounting portion (11) of the roller sleeve (1) is fixed with a boss (13), and the actuator (4) further comprises a support plate (42), the support plate (42) being close to one side of the roller sleeve (1) and connected to a limiting sleeve (421) for accommodating the boss (13), the driving member being mounted on the side of the support plate (42) away from the roller sleeve (1), and the force application center of the driving member passing through the axis of the limiting sleeve (421).

6. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 5, characterized in that: The driving member is a cylinder (43), a screw rod (422) is provided on the side of the support plate (42) away from the roller sleeve (1), and the cylinder (43) and the screw rod (422) are threadedly connected.

7. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 6, characterized in that: The elastic member is provided with a connecting flange (21), and the lower mounting portion (12) is provided with a connecting sleeve (14). The connecting flange (21) and the connecting sleeve (14) are detachably connected, and the connection length of the connecting flange (21) is shorter than the length of the connecting sleeve (14).

8. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 7, characterized in that: The elastic member is a compression spring (2), the depth of the cavity (121) is greater than the free extension of the compression spring (2), and when the compression spring (2) is in a free state, the upper end surface of the pressure rod (3) away from the compression spring (2) is higher than the lower vertex of the extended roller shaft.

9. The device for detecting dynamic deflection of an extension shaft based on a laser displacement sensor according to claim 3 or 5, characterized in that: The distance between the height of the pressure rod (3) when it is at the upper limit position of the adjustment hole (122) and the axis of the extension roller shaft is smaller than the radius of the extension roller shaft.

10. A method for detecting dynamic deflection of an extended shaft based on a laser displacement sensor, characterized in that: The device for detecting dynamic deflection of an extended shaft based on a laser displacement sensor according to any one of claims 1 to 9 comprises the following steps: S1. Install the roller sleeve (1) and the extended roller to be tested concentrically on the box body, with the length direction of the lower mounting portion (12) of the roller sleeve (1) being in the vertical direction; S2, inserting the pressure rod (3) into the two adjustment holes (122), and aligning the beam direction of the laser displacement sensor (5) with the cantilever direction extending out of the roller shaft; S3, installing the compression spring (2) into the mold cavity (121), connecting the connecting flange (21) to the roller sleeve (1), and under the action of the compression spring (2), the pressure rod (3) is tangent to the extended roller shaft; S4. The limiting sleeve (421) of the execution frame (41) is sleeved in the convex column (13) of the roller sleeve (1), the first plug-in portion (411) is installed in the first receiving groove (31), the second plug-in portion (412) is installed in the second receiving groove (32), and the cylinder (43) is fixed to the box body and is used to drive the execution frame (41) to reciprocate up and down; S5. Two measuring points are taken within the effective range, and the distances L1 and L2 of the two measuring points in the longitudinal direction are measured by the laser displacement sensor (5), and the displacement y value of the two measuring points in the vertical direction is obtained according to the pushing distance of the cylinder (43). The rotation angle of the extended roller can be calculated as a=arctan(y / (L2-L1)); when the rotation angle of the roller is greater than the safety threshold value, the PLC controller triggers the alarm function and stops the machine for detection in time.

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