High-precision lower eccentric sleeve type disc shear and overlap amount control method

Abstract

The application provides a high-precision lower eccentric sleeve type disc shear and an overlap amount control method. The disc shear comprises a rack (1), an upper cutter sleeve (2), a cutter blade (3), an upper cutter shaft (4), a lower cutter shaft (5), a lower eccentric sleeve (6), a driving mechanism (7), a ring-shaped grating ruler detection mechanism (8) and a control unit (9). The application also relates to an overlap amount control method. The application integrates the ring-shaped grating ruler detection mechanism (8) at the tail of the lower eccentric sleeve (6), cooperates with the reading head switching and high-precision signal processing technology, realizes high-precision detection of the rotation angle of the lower eccentric sleeve (6), combines the PID+feedforward compensation composite control algorithm, and thus improves the overlap amount control precision to ±0.01 mm, effectively solves the problem of low overlap amount control precision in the prior art, and meets the high-speed shearing demand of the extremely thin plate.

Description

Technical Field

[0001] This invention relates to the field of metal sheet shearing equipment; and more particularly to a high-precision lower eccentric sleeve disc shear and an overlap control method. Background Technology

[0002] The disc shear for edge trimming is a key piece of equipment on a metal sheet production line. It is mainly used for trimming or slitting rolled sheets to length. The quality of its trimming directly affects the accuracy and efficiency of subsequent processing steps. The lower eccentric sleeve type disc shear adjusts the overlap between the upper and lower shear blades by changing the rotation angle of the lower eccentric sleeve, thus adapting to the shearing needs of sheets of different thicknesses and materials. The precision of the overlap control is one of the core parameters determining the shearing quality.

[0003] In existing technologies, the overlap adjustment of lower eccentric sleeve-type cutting disc shears mostly uses ordinary encoders for indirect angle detection, which has the following drawbacks: First, the indirect detection accuracy of ordinary encoders is low, and there is mechanical backlash, making it difficult to meet the stringent requirements of high-precision shearing for overlap; Second, the data calculated by indirect detection cannot reflect the actual status of the online equipment and cannot truly reflect the equipment status; The overlap control accuracy of lower eccentric sleeve-type disc shears in the industry is generally only ±0.03mm, which is difficult to adapt to the high-speed (600m / min) shearing process requirements of ultra-thin (0.1mm-0.5mm) metal sheets, thus restricting the improvement of product quality.

[0004] To address the aforementioned technical challenges, there is an urgent need to develop a lower eccentric sleeve-type disc shear and a corresponding control method that can significantly improve the accuracy of overlap control. The ring grating ruler, as a high-precision angle detection element, possesses advantages such as high resolution, strong anti-interference capability, and stable measurement, and has been successfully applied in precision machine tools, rotary tables, and other fields. If the ring grating ruler can be rationally integrated into the lower eccentric sleeve structure of the lower eccentric sleeve-type disc shear, and coupled with efficient signal processing and control strategies, it is expected that the accuracy of overlap control can be elevated to a new level. Summary of the Invention

[0005] This invention provides a high-precision method for controlling the overlap of a lower eccentric sleeve-type disc shear.

[0006] This invention is achieved through the following technical solution:

[0007] This invention relates to a high-precision lower eccentric sleeve type disc shear, comprising a frame 1, an upper blade sleeve 2, a blade 3, an upper blade shaft 4, a lower blade shaft 5, a lower eccentric sleeve 6, a drive mechanism 7, an annular grating ruler detection mechanism 8, and a control unit 9;

[0008] The outer circle of the upper tool sleeve 2 is coaxial with the inner hole without eccentricity. The upper tool sleeve 2 is assembled in the frame 1, and the upper tool shaft 4 is rotatably assembled in the upper tool sleeve 2 through the bearing.

[0009] The lower cutter shaft 5 is rotatably mounted in the lower eccentric sleeve 6 via a bearing, and the lower eccentric sleeve 6 is installed in the lower hole of the frame 1;

[0010] The drive mechanism 7 and the lower eccentric sleeve 6 are driven to rotate around their own axis by a worm gear mechanism;

[0011] The annular grating ruler detection mechanism 8 is installed at the tail of the lower eccentric sleeve 6 and is used to detect the rotation angle of the lower eccentric sleeve 6 in real time, thereby calculating the overlap value of the two blades 3 installed on the upper blade shaft 4 and the lower blade shaft 5.

[0012] The control unit 9 is connected to the annular grating ruler detection mechanism 8 and the drive mechanism 7 via electrical signals. It is used to receive the angle signal output by the annular grating ruler detection mechanism 8 and control the drive mechanism 7 to adjust the rotation angle of the lower eccentric sleeve 6 according to the preset overlap parameters, so as to achieve precise control of the overlap.

[0013] Preferably, the annular grating ruler detection mechanism 8 includes: annular grating ruler body 81, reading head assembly 82, and mounting base 83.

[0014] Preferably, the annular grating ruler body 81 is coaxially fixedly installed on the outer circle of the tail of the lower eccentric sleeve 6, and grating lines are evenly distributed in the circumferential direction of the annular grating ruler body 81.

[0015] Preferably, the reading head assembly 82 is mounted on the mounting base 83, the mounting base 83 is fixed on the frame 1, and the detection end of the reading head assembly 82 is correspondingly set with the grating lines of the annular grating ruler body 81, and a preset gap is maintained between the two.

[0016] Preferably, the grating ruler detection mechanism 8 further includes: two sets of proximity switches 84 and one proximity switch sensing element 85; the two sets of proximity switches 84 are fixed on the frame 1, and the proximity switch sensing element 85 is disposed at the tail of the eccentric sleeve. The two proximity switches 84 and one sensing element 85 are used to control the range and direction of use of the eccentric sleeve.

[0017] Preferably, the drive mechanism 7 includes: a servo motor 71, a reduction gearbox, and a two-stage transmission worm gear;

[0018] The servo motor 71 is connected to the first-stage transmission worm 73 through a reduction gearbox. The first-stage transmission worm wheel 74 is coaxial with the second-stage transmission worm 75. The second-stage transmission worm wheel 76 is fixedly connected to the tail of the lower eccentric sleeve 6. The second-stage transmission worm wheel 76 is coaxial with the outer circle of the lower eccentric sleeve 6.

[0019] Preferably, the servo motor 7 is a high-precision servo motor, and the gearbox is a harmonic gearbox to ensure driving accuracy and transmission stability.

[0020] Preferably, the control unit 9 includes: a signal processing module 91, a core control module 92, and a drive module 93;

[0021] The signal processing module 91 is electrically connected to the reading head assembly 82 and is used to perform fourth harmonic subdivision, direction determination and noise filtering on the grating signal output by the reading head assembly 82.

[0022] The core control module 92 adopts an FPGA+ARM heterogeneous architecture. The FPGA is used to realize the real-time acquisition and fast calculation of angle signals, and the ARM is used to run complex control algorithms and human-computer interaction management.

[0023] The drive module 93 is electrically connected to the servo motor 71 and is used to receive control commands from the core control module 92 to drive the servo motor 71 to move precisely.

[0024] Preferably, the control unit 9 further includes a Kalman filter algorithm module, used to fuse and optimize the angle signal output by the annular grating ruler detection mechanism, eliminate detection errors caused by factors such as vibration and electromagnetic interference, and improve the angle detection accuracy.

[0025] This invention also relates to the aforementioned method for controlling the overlap of a high-precision eccentric sleeve-type disc shear, comprising the following steps:

[0026] S1: Parameter calibration and initialization

[0027] A model of the correspondence between the rotation angle and the overlap of the lower eccentric sleeve 6 is established in advance. The actual overlap under different rotation angles is calibrated through experiments, and an angle-overlap calibration table is generated and stored in the control unit 9. The current actual overlap value is detected, and the angle reading of the annular grating ruler detection mechanism 8 is set to correspond to the current overlap. The initial angle value of the reading head assembly 82 and the rotation direction of the eccentric sleeve are recorded to complete the system initialization.

[0028] S2: Set target overlap amount

[0029] Based on the thickness and material parameters of the plate to be sheared, the target overlap parameter is input through the human-machine interface. The control unit 9 calculates the corresponding target rotation angle of the lower eccentric sleeve 6 according to the angle-overlap correspondence table.

[0030] S3: Real-time Angle Detection and Signal Processing

[0031] The ring grating ruler detection mechanism 8 is activated, and the reading head assembly 82 collects the grating signal of the ring grating ruler body 81 in real time and transmits it to the signal processing module 91. The signal processing module 91 performs fourth harmonic subdivision, direction determination and filtering on the grating signal to obtain the original signal of the real-time rotation angle of the lower eccentric sleeve 6, thus realizing continuous and accurate measurement of the angle.

[0032] S4: Closed-loop control adjustment

[0033] The core control module 92 compares the real-time rotation angle with the target rotation angle and calculates the angle deviation. It adopts a composite control algorithm of PID + feedforward compensation to generate control commands based on the angle deviation. The control commands are amplified by the drive module 93 and transmitted to the servo motor 71. The servo motor 71 drives the lower eccentric sleeve 6 to rotate through a reduction gearbox and a two-stage worm gear reduction system, adjusting the angle of the lower eccentric sleeve 6 to reduce the angle deviation. At the same time, the control unit 9 optimizes the real-time angle signal through a Kalman filter algorithm to further improve the control accuracy.

[0034] S5: Overlap Amount Stability Control

[0035] During the shearing process, the control unit 9 continuously repeats steps S3-S4, monitors the rotation angle of the lower eccentric sleeve 6 in real time, and dynamically adjusts the action of the drive mechanism 7 to keep the overlap amount stable within the range of the target overlap amount ±0.01mm, thereby achieving high-precision and stable control and monitoring of the overlap amount.

[0036] The present invention has the following advantages:

[0037] (1) Significantly improved control accuracy: This invention integrates a ring grating ruler detection mechanism at the tail of the lower eccentric sleeve, and with the help of reading head switching and high-precision signal processing technology, it realizes high-precision detection of the rotation angle of the lower eccentric sleeve. Combined with the composite control algorithm of PID + feedforward compensation, the overlap control accuracy is improved to ±0.01mm, which effectively solves the problem of low overlap control accuracy in the prior art and meets the high-speed shearing requirements of ultra-thin plates.

[0038] (2) Strong detection stability: The annular grating ruler involved in this invention has the advantages of anti-electromagnetic interference, anti-vibration and low wear. Two sets of proximity switches and the sensing plate fixed on the lower eccentric sleeve determine the application range and direction of the lower eccentric sleeve. At the same time, the application of the Kalman filter algorithm further eliminates detection noise and ensures the reliability of the detection signal.

[0039] (3) Fast response speed: The present invention adopts a control unit with FPGA+ARM heterogeneous architecture. The FPGA realizes real-time acquisition and fast calculation of angle signals, and the processing delay is controlled at the microsecond level. Combined with a high-precision servo drive system, it realizes real-time dynamic adjustment of the overlap amount, which can adapt to the needs of high-speed shearing conditions and reduce quality defects in the shearing process.

[0040] (4) Convenient operation and strong versatility: The present invention uses a pre-calibrated angle-overlap calibration table, which only requires inputting the target overlap amount to automatically complete the angle adjustment, making the operation convenient; at the same time, the target overlap amount can be flexibly adjusted according to different plate parameters, adapting to the shearing needs of various materials and thicknesses of plates, making it highly versatile. Attached Figure Description

[0041] Figure 1 This is the front view of the high-precision lower eccentric sleeve disc shear of the present invention;

[0042] Figure 2 This is a cross-sectional view of the high-precision lower eccentric sleeve disc of the present invention;

[0043] Figure 3 This is a side view of the annular grating ruler detection mechanism of the present invention;

[0044] Figure 4 This is a front view of the annular grating ruler detection mechanism of the present invention;

[0045] Figure 5 This is a top view of the annular grating ruler detection mechanism of the present invention;

[0046] Figure 6 This is a flowchart of the overlap control method of the present invention;

[0047] Figure 7 This is a structural block diagram of the control unit of the present invention;

[0048] Figure labels: 1-Frame, 2-Upper tool sleeve, 3-Insert blade, 4-Upper tool shaft, 5-Lower tool shaft, 6-Lower eccentric sleeve, 7-Drive mechanism, 71-Servo motor, 72-Coupling, 73-First-stage transmission worm gear, 74-First-stage transmission worm wheel, 75-Second-stage transmission worm gear, 76-Second-stage transmission worm wheel, 8-Annular grating ruler detection mechanism, 81-Annular grating ruler body, 82-Reading head assembly, 83-Mounting base, 84-Proximity switch, 85-Sensing element, 9-Control unit, 91-Signal processing module, 92-Core control module, 93-Drive module. Detailed Implementation

[0049] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are merely further illustrations of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.

[0050] Example 1

[0051] This embodiment relates to a high-precision lower eccentric sleeve type disc shear, such as... Figure 1 and Figure 2 As shown, it includes: frame 1, upper cutter shaft 4, upper cutter sleeve 2, blade 3, lower cutter shaft 5, lower eccentric sleeve 6, drive mechanism 7, annular grating ruler detection mechanism 8, and control unit 9;

[0052] The outer circle of the upper cutter sleeve 2 is coaxial with the inner hole without eccentricity. The upper cutter sleeve 2 is assembled in the frame 1, and the upper cutter shaft 4 is rotatably assembled in the upper cutter sleeve 2 through bearings. The lower eccentric sleeve 6 is assembled in the lower hole of the frame 1, and the lower cutter shaft 5 is rotatably installed in the lower eccentric sleeve 6 through bearings. An eccentric structure is provided between the lower eccentric sleeve 6 and the lower cutter shaft 5. The eccentricity is set to 7.5mm according to the shearing process requirements. The drive mechanism 7 and the lower eccentric sleeve 6 are driven to rotate around their own axis through a worm gear mechanism. The drive mechanism 7 includes a servo motor 71, a coupling 72, a first-stage transmission worm 73, a first-stage transmission worm wheel 74, a second-stage transmission worm 75, a second-stage transmission worm wheel 76, a reduction gearbox, and a transmission gear set. The end transmission ratio from the servo motor 71 to the second-stage transmission worm wheel 76 is 1:10000 to ensure drive accuracy and transmission stability.

[0053] See Figures 3-5 As shown, the annular grating ruler detection mechanism 8 is installed at the tail of the lower eccentric sleeve 6. The annular grating ruler detection mechanism 8 includes an annular grating ruler body 81, a reading head assembly 82, a mounting base 83, a proximity switch 84, and a sensing plate 85. Figure 2 As shown; the annular grating ruler body 81 adopts an absolute annular grating ruler with a resolution of ±3″, and is coaxially fixedly installed on the tail end face of the lower eccentric sleeve 6. The annular grating ruler body 81 is engraved with grating lines with a spacing of 2μm in the circumferential direction; the mounting base 83 is fixed to the frame 1 by bolts, and the reading head assembly 82 is installed on the mounting base 83, and the detection end of the reading head assembly 82 is set to correspond to the grating lines of the annular grating ruler body 81, and a preset gap of 0.1~0.2mm is maintained between them; the reading head assembly 82 adopts a Heidenhain LC183 type reading head, which has a fourth frequency subdivision function; the annular grating ruler detection mechanism 8 also includes two proximity switches 84 and a sensing plate 85 set in the circumferential direction at the tail of the lower eccentric sleeve 6 for controlling the application range and rotation direction of the eccentric sleeve.

[0054] See Figure 7 The control unit 9 is electrically connected to the annular grating ruler detection mechanism 8 and the drive mechanism 7, and includes a signal processing module 91, a core control module 92, and a drive module 93. The signal processing module 91 uses an ALTERA Cyclone IV series FPGA chip and is electrically connected to the reading head assembly 82. It is used to perform fourth-harmonic subdivision, direction determination, and noise filtering on the grating signal output by the reading head. The core control module 92 adopts an FPGA+ARM heterogeneous architecture. The ARM chip is an STM32H743VIT6. It is used to run the PID+feedforward compensation composite control algorithm, Kalman filter algorithm, and human-machine interaction management. The drive module 93 uses a Siemens S120 servo driver and is electrically connected to the servo motor 71. It is used to receive control commands from the core control module 92 and drive the servo motor 71 to move precisely.

[0055] like Figure 6 As shown, a method for controlling the overlap of a high-precision eccentric sleeve-type disc shear includes the following steps:

[0056] S1: Parameter calibration and initialization

[0057] The actual overlap amount under different rotation angles is pre-calibrated through experiments: the plate to be calibrated is fixed at the shearing station, the lower eccentric sleeve 6 is controlled to start from 0°, and the corresponding overlap amount is recorded every 0.1° rotation (measured by a laser thickness gauge), an angle-overlap amount calibration table is generated and stored in the ARM chip of the control unit 9; the angle reading of the annular grating ruler detection mechanism 8 is set to zero, the initial angle value of the reading head assembly 82 is recorded, and the system initialization is completed.

[0058] S2: Set target overlap amount

[0059] Based on the parameters of the sheet material to be sheared (such as a cold-rolled steel sheet with a thickness of 0.5mm), the target overlap parameter of 0.1mm is input into the lower eccentric sleeve through the human-machine interface. The control unit 9 calculates the corresponding target rotation angle of the lower eccentric sleeve as 14° according to the angle-overlap calibration table.

[0060] S3: Real-time Angle Detection and Signal Processing

[0061] The annular grating ruler detection mechanism 8 is started, and the reading head assembly 82 collects the grating signal of the annular grating ruler body 81 in real time and transmits it to the signal processing module 91. The signal processing module 91 subdivides the grating signal, performs direction determination and first-order low-pass filtering, and obtains the original signal of the real-time rotation angle of the lower eccentric sleeve 6, thus realizing continuous and accurate measurement of the whole circle angle.

[0062] S4: Closed-loop control adjustment

[0063] The core control module 92 compares the real-time rotation angle with the target rotation angle of 14° and calculates the angle deviation. Based on the angle deviation, it generates control commands, which are amplified by the drive module 93 and transmitted to the servo motor 71. The servo motor 71 drives the lower eccentric sleeve 6 to rotate through the first-stage worm gear system and the second-stage worm gear system, adjusting the angle of the lower eccentric sleeve 6 to reduce the angle deviation. At the same time, the control unit 9 optimizes the real-time angle signal through a Kalman filter algorithm to eliminate detection errors caused by vibration.

[0064] S5: Overlap Amount Stability Control

[0065] During the shearing process, if the overlap needs to change in real time, the control unit 9 continuously repeats steps S3-S4 at a sampling frequency of 1kHz, monitors the rotation angle of the lower eccentric sleeve 6 in real time and dynamically adjusts the action of the drive mechanism 7, so that the overlap is always stable within the range of ±0.01mm, achieving high-precision and stable control of the overlap.

[0066] In this embodiment, through the above technical solution, the overlap control accuracy of the lower eccentric sleeve disc shear reaches 0.015mm, which is significantly improved compared to ±0.03mm of the prior art. Under the condition of high-speed ultra-thin plate shearing (shearing speed 600m / min), the overlap fluctuation range is controlled within ±0.01mm, and the edge burr of the sheared plate is less than 0.02mm, which meets the shearing quality requirements of ultra-thin metal plates.

[0067] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A high-precision lower eccentric sleeve type disc shear, characterized in that, It includes a frame (1), an upper tool sleeve (2), a blade (3), an upper tool shaft (4), a lower tool shaft (5), a lower eccentric sleeve (6), a drive mechanism (7), an annular grating ruler detection mechanism (8), and a control unit (9); The outer circle of the upper tool sleeve (2) is coaxial with the inner hole without eccentricity. The upper tool sleeve (2) is assembled in the frame (1), and the upper tool shaft (4) is rotated and assembled in the upper tool sleeve (2) through the bearing. The lower cutter shaft (5) is rotatably mounted in the lower eccentric sleeve (6) via a bearing, and the lower eccentric sleeve (6) is installed in the lower hole of the frame (1); The drive mechanism (7) and the lower eccentric sleeve (6) are driven to rotate around their own axis through a worm gear mechanism; The annular grating ruler detection mechanism (8) is installed at the tail of the lower eccentric sleeve (6) to detect the rotation angle of the lower eccentric sleeve (6) in real time, thereby calculating the overlap value of the two blades (3) installed on the upper blade shaft (4) and the lower blade shaft (5). The control unit (9) is connected to the annular grating ruler detection mechanism (8) and the drive mechanism (7) via electrical signals. It is used to receive the angle signal output by the annular grating ruler detection mechanism (8) and control the drive mechanism (7) according to the preset overlap parameters to adjust the rotation angle of the lower eccentric sleeve (6) and achieve precise control of the overlap.

2. The high-precision lower eccentric sleeve type disc shear as described in claim 1, characterized in that, The annular grating ruler detection mechanism (8) includes: an annular grating ruler body (81), a reading head assembly (82), and a mounting base (83).

3. The high-precision lower eccentric sleeve type disc shear as described in claim 2, characterized in that, The annular grating ruler body (81) is coaxially fixedly installed on the outer circle of the tail of the lower eccentric sleeve (6), and grating lines are evenly distributed in the circumferential direction of the annular grating ruler body (81).

4. The high-precision lower eccentric sleeve type disc shear as described in claim 2, characterized in that, The reading head assembly (82) is mounted on the mounting base (83), which is fixed on the frame (1). The detection end of the reading head assembly (82) is set to correspond with the grating lines of the annular grating ruler body (81).

5. The high-precision lower eccentric sleeve type disc shear as described in claim 2, characterized in that, The grating ruler detection mechanism (8) also includes: two sets of proximity switches (84) and one proximity switch sensing plate (85); the two sets of proximity switches (84) are fixed on the frame (1) and the proximity switch sensing plate (85) is set at the tail of the eccentric sleeve.

6. The high-precision lower eccentric sleeve type disc shear as described in claim 2, characterized in that, The drive mechanism (7) includes: a servo motor (71), a gearbox, and a two-stage transmission worm gear; The servo motor (71) is connected to the first-stage transmission worm (73) through a gearbox. The first-stage transmission worm wheel (74) is coaxial with the second-stage transmission worm (75). The second-stage transmission worm wheel (76) is fixedly connected to the tail of the lower eccentric sleeve (6). The second-stage transmission worm wheel (76) is coaxial with the outer circle of the lower eccentric sleeve (6).

7. The high-precision lower eccentric sleeve type disc shear as described in claim 6, characterized in that, The servo motor (7) is a high-precision servo motor, and the gearbox is a harmonic gearbox.

8. The high-precision lower eccentric sleeve type disc shear as described in claim 1, characterized in that, The control unit (9) includes: a signal processing module (91), a core control module (92), and a drive module (93). The signal processing module (91) is electrically connected to the reading head assembly (82) and is used to perform fourth-harmonic subdivision, direction determination and noise filtering on the grating signal output by the reading head assembly (82); The core control module (92) adopts an FPGA+ARM heterogeneous architecture. The FPGA is used to realize the real-time acquisition and fast calculation of angle signals, and the ARM is used to run complex control algorithms and human-computer interaction management. The drive module (93) is electrically connected to the servo motor (71) and is used to receive control commands from the core control module (92) to drive the servo motor (71) to move precisely.

9. The high-precision lower eccentric sleeve type disc shear as described in claim 8, characterized in that, The control unit (9) further includes a Kalman filter algorithm module, which is used to fuse and optimize the angle signal output by the ring grating ruler detection mechanism, eliminate detection errors caused by factors such as vibration and electromagnetic interference, and improve the angle detection accuracy.

10. A method for controlling the overlap of a high-precision eccentric sleeve-type disc shear as described in claim 1, characterized in that, Includes the following steps: S1: Parameter calibration and initialization A model of the correspondence between the rotation angle and the overlap of the lower eccentric sleeve (6) is established in advance. The actual overlap under different rotation angles is calibrated by experiment. An angle-overlap calibration table is generated and stored in the control unit (9). The current actual overlap value is detected and the angle reading of the ring grating ruler detection mechanism (8) is set to correspond to the current overlap. The initial angle value of the reading head assembly (82) and the rotation direction of the eccentric sleeve are recorded to complete the system initialization. S2: Set target overlap amount According to the thickness and material parameters of the plate to be sheared, the target overlap parameters are input through the human-machine interface. The control unit (9) calculates the corresponding target rotation angle of the lower eccentric sleeve (6) according to the angle-overlap correspondence table. S3: Real-time Angle Detection and Signal Processing The ring grating ruler detection mechanism (8) is started, and the reading head assembly (82) collects the grating signal of the ring grating ruler body (81) in real time and transmits it to the signal processing module (91). The signal processing module (91) performs four-fold frequency subdivision, direction determination and filtering on the grating signal to obtain the real-time rotation angle original signal of the lower eccentric sleeve (6). S4: Closed-loop control adjustment The core control module (92) compares the real-time rotation angle with the target rotation angle and calculates the angle deviation. It adopts a composite control algorithm of PID + feedforward compensation to generate control commands based on the angle deviation. The control commands are amplified by the drive module (93) and transmitted to the servo motor (71). The servo motor (71) drives the lower eccentric sleeve (6) to rotate through the gearbox and the two-stage worm gear reduction system, and adjusts the angle of the lower eccentric sleeve (6) to reduce the angle deviation. At the same time, the control unit (9) optimizes the real-time angle signal through the Kalman filter algorithm. S5: Overlap Amount Stability Control During the shearing process, the control unit (9) continuously repeats steps S3-S4, monitors the rotation angle of the lower eccentric sleeve (6) in real time and dynamically adjusts the action of the drive mechanism (7) so that the overlap amount is always stable within the range of the target overlap amount ±0.01mm, thereby realizing the control and monitoring of the overlap amount.

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