A flying shear blade calibration system based on an incremental encoder

Abstract

This invention discloses a flying shear blade calibration system based on an incremental encoder, belonging to the field of steel production technology. It solves the technical problem that absolute encoders are easily affected by vibrations generated during equipment operation, leading to blade position displacement. The system includes a controller, an incremental encoder, a proximity switch, and a sensing stop. The incremental encoder is mounted on the motor shaft of the flying shear motor, the proximity switch is mounted on the side wall of the flying shear reducer, and the sensing stop is mounted on the upper or lower blade connecting shaft of the flying shear reducer. The proximity switch and the blade point are on the same vertical plane. When the upper blade rotates to its lowest point, the proximity switch can effectively sense the sensing stop. The controller is electrically connected to the incremental encoder, the proximity switch, and the flying shear motor. The controller includes a reference coordinate system setting module, a detection and calculation module, and a calibration control module. This invention keeps the incremental encoder away from the flying shear reducer, effectively avoiding the influence of mechanical vibration.

Description

Technical Field

[0001] This invention relates to the field of steel production technology, and more specifically, to a flying shear blade calibration system based on an incremental encoder. Background Technology

[0002] The start-stop flying shear is an important piece of equipment installed after the rolling mill for segmented shearing of rolled pieces. In head cutting, tail cutting, and multiple-length shearing, the rolled piece passes through the flying shear at a constant speed. Shearing begins when the measured length of the rolled piece reaches the set length and the flying shear blade rotates onto the rolled piece, thus achieving shearing of the rolled piece while it is in operation. This process is implemented by the flying shear control system, where the position control of the flying shear blade is the key to the flying shear control.

[0003] In existing technologies, such as Figure 1 As shown, the start-stop flying shear consists of a motor A, a flying shear reducer B, and upper and lower shear blades C. The shear blade position detection sensor uses an absolute encoder mounted coaxially with the shear blade, that is, the absolute encoder is installed on the reducer output shaft D, which is directly connected to the shear blade. During production, the absolute encoder connector is prone to loosening due to vibrations generated during equipment operation. A loose connector will cause the shear blade position to shift (the shear blade position is determined by the feedback position of the absolute encoder), thus affecting the normal cutting of the flying shear and even causing steel pile-up accidents. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a flying shear blade calibration system based on an incremental encoder.

[0005] The technical solution of the present invention is: a flying shear blade calibration system based on an incremental encoder, including a controller, an incremental encoder, a proximity switch, and a sensing stop. The incremental encoder is installed on the motor shaft of the flying shear motor, the proximity switch is installed on the side wall of the flying shear reducer, and the sensing stop is installed on the upper or lower shear blade connecting shaft of the flying shear reducer. The proximity switch and the shear blade point are on the same vertical plane. When the upper shear blade rotates to the lowest point, the proximity switch can effectively sense the sensing stop. The controller is electrically connected to the incremental encoder, the proximity switch, and the flying shear motor.

[0006] The controller includes a reference coordinate system setting module, a detection and calculation module, and a calibration control module.

[0007] The reference coordinate system setting module is used to set the target position, speed and acceleration of the flying shear according to the process shearing requirements, generate the given control path and waveform curve of position and speed according to the principle of fastest response time, and then determine the reference coordinate system of the flying shear blade;

[0008] The detection and calculation module is used to obtain the real-time position of the flying shear blade based on the incremental encoder and proximity switch;

[0009] The calibration control module is used to establish a reference point for the position of the shear blade and to perform high-precision calibration control on the position of the flying shear blade.

[0010] As a further improvement, the reference coordinate system includes:

[0011] In place, the shear blade remains stationary in its original position when no cutting is being performed;

[0012] The shearing position is the point where the flying shear accelerates from its original position during shearing. When the shear blade contacts the workpiece, the shearing of the workpiece begins, and this position is the shearing position.

[0013] After shearing is completed, the flying shear continues to rotate. Shearing is completed when the flying shear detaches from the rolled piece and pushes the rolled piece out. This position is the end of shearing.

[0014] Furthermore, the flying shear's movement process is as follows: the flying shear starts accelerating from 0 speed in its original position until it reaches the cutting position. The flying shear then moves at its maximum speed at a constant speed until it reaches the cutting position and completes the cutting action. Then, the flying shear performs a forward climbing deceleration movement until it stops. Finally, the flying shear performs a reverse climbing movement and stops accurately in its original position.

[0015] Furthermore, the reference coordinate system setting module converts the in-situ, shear position, and shear completion position information of the reference coordinate system into constant data that the controller can recognize and initializes them into the controller's initial value database for subsequent algorithm calls.

[0016] Furthermore, the rotation angle relationship between the "shear blade-reducer-motor" is established in the detection and calculation module as follows:

[0017]

[0018] in,

[0019] Furthermore, the sensing stop is mounted on the upper or lower shear blade connecting shaft via a 360° adjustable mounting ring, which is locked in place by a tightening bolt.

[0020] Furthermore, in the detection and calculation module, the position of the shear blade is represented by an angle, and it rotates in one direction with the flying shear motor, with one rotation being 360°;

[0021] The position where the upper and lower shear blades completely intersect, i.e., the lowest point of the upper shear blade, is marked as the cutting point of the flying shear. The cutting point is defined as 0° of the flying shear blade angle.

[0022] When the flying shear blade is working, it rotates along the direction of the workpiece movement. With 0° as the reference point, when it rotates to angle E, it is marked as the original position of the blade.

[0023] The correspondence between the shear blade angle position and the encoder pulse value is as follows:

[0024] When the shear blade is closed, the pulse value is 0 and the angle is 0°; when the shear blade is in its original position, the pulse value is M×i×A÷360° and the angle is E; when the shear blade rotates one revolution, the pulse value is M×i and the angle is 360°; M is the number of pulses generated by the incremental encoder in one revolution.

[0025] Furthermore, with an angle E of 90°, the incremental encoder generates 1024 pulses per revolution.

[0026] Furthermore, the controller is a PLC, and the process of establishing a reference point for the position of the shear blade in the calibration control module is called the in-situ calibration of the shear blade.

[0027] The calibration process is as follows:

[0028] Step 1: After turning the "In-situ Activation" switch of the PLC to the cancel position, operate the "Forward Climb" or "Reverse Climb" switch. The control command is sent to the calibration control module through the PLC. The calibration control module outputs a control signal to the driver, and then the driver controls the flying shear motor to rotate the shear blade to the shearing position. After confirming that the shear blade is in the correct closed position, press the "Flying Shear Blade Calibration" button. The "Calibration" command is sent to the calibration control module. The detection and calculation module takes this point as the reference reference point in the pre-established reference coordinate system and sets it to 0°. The encoder pulse calculation value inside the detection and calculation module is initialized to 0. Simultaneously, the position of the shear blade is marked as 90° along the rolling direction of the reference reference point. After the data conversion and calculation are completed, the calibration control module feeds back a signal to the PLC. The PLC controls the "0-position calibration status indicator" to change from on to off, that is, the 0-position calibration is completed.

[0029] Step 2: After the 0-position calibration is completed, switch the "In-situ Activation" switch to the active position, and then click the "Flying Shear Reset" button. The calibration control module receives the shear blade reset command from the PLC and calls the detection and calculation module to execute the internally written program to control the flying shear blade to rotate at 5% of the rated speed along the workpiece movement direction. The detection and calculation module calculates the pulse data fed back by the incremental encoder in real time. When the induction stop blocks the proximity switch, the proximity switch signal changes from 0 to 1, triggering the calibration control module to execute the memory program. The memory program records the encoder pulse data P0 at the moment the proximity switch signal changes. The P0 value is the accumulated pulse value detected by the flying shear motor as it rotates from position 0 along the workpiece movement direction to the proximity switch position. The calibration control module continues to control the shear blade to rotate at 5% of the rated speed along the workpiece movement direction, controlling the shear blade to return to its original position and stop. Then switch the "In-situ Activation" switch to the cancel position. At this point, the flying shear in-situ calibration action is completed.

[0030] The calibration control module stores the successful calibration results in its internal program, achieving long-term validity of a single calibration.

[0031] Furthermore, after the driver trips and reconnects, the operator needs to perform a shear blade reset procedure to reset the blade. The flying shear rotates at 5% of its rated speed along the direction of the rolled piece. When the proximity switch signal changes from 0 to 1, the calibration control module automatically sets the current position of the flying shear to the memory value P0 of the 0-position calibration, and then positions the shear blade at 90°.

[0032] Beneficial effects

[0033] Compared with the prior art, the advantages of this invention are as follows:

[0034] 1. Compared with the original technical solution, the present invention can not only reduce one absolute encoder, but also move the incremental encoder for detecting the shear blade position away from the flying shear reducer, effectively avoiding the influence of mechanical vibration, thereby optimizing the system, saving costs, reducing failure points, and reducing the accident rate.

[0035] 2. This invention only requires recalibration if the system needs to be reinitialized for special reasons or if the shear blade's original stop position is incorrect. The proximity switch signal is only used during offline calibration; it does not function during normal shearing. Therefore, it effectively avoids calibration failures caused by erroneous proximity switch signals during normal flying shear use, reduces the flying shear's dependence on the proximity switch for normal operation, and improves the flying shear's reliability. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the existing technology;

[0037] Figure 2 This is a schematic diagram of the structure of the present invention;

[0038] Figure 3 for Figure 2 A cross-sectional view along the HH direction;

[0039] Figure 4 This is a schematic diagram of the movement process of the flying shear in this invention;

[0040] Figure 5 This is a flowchart of the calibration operation in this invention.

[0041] Among them: 1-Incremental encoder, 2-Proximity switch, 3-Induction stop, 4-Flying shear motor, 5-Motor shaft, 6-Flying shear reducer, 7-Upper shear blade connecting shaft, 8-Lower shear blade connecting shaft, 9-Shear blade point, 10-Upper shear blade, 11-Lower shear blade, 12-Mounting ring, 13-Tightening bolt. Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0043] See Figures 2-5 A flying shear blade calibration system based on an incremental encoder includes a controller, an incremental encoder 1, a proximity switch 2, and a sensing stop 3. The incremental encoder 1 is mounted on the motor shaft 5 of the flying shear motor 4, ensuring that the encoder 1, which detects the blade position, is far from the flying shear reducer 6, effectively avoiding the influence of mechanical vibration. The proximity switch 2 is mounted on the side wall of the flying shear reducer 6, and the sensing stop 3 is mounted on the upper blade connecting shaft 7 or the lower blade connecting shaft 8 of the flying shear reducer 6. The proximity switch 2 and the blade point 9 are on the same vertical plane; when the upper blade 10 rotates to its lowest point, the proximity switch 2 can effectively sense the sensing stop 3. The controller is electrically connected to the incremental encoder 1, the proximity switch 2, and the flying shear motor 4.

[0044] The controller is equipped with a reference coordinate system setting module, a detection and calculation module, and a calibration control module.

[0045] The reference coordinate system setting module is used to set the target position, speed and acceleration of the flying shear according to the process shearing requirements, generate the given control path and waveform curve of position and speed according to the principle of fastest response time, and then determine the reference coordinate system of the flying shear blade.

[0046] The detection and calculation module is used to obtain the real-time position of the flying shear blade based on the incremental encoder 1 and the proximity switch 2.

[0047] The calibration control module is used to establish a reference point for the position of the shear blade and to perform high-precision calibration control on the position of the flying shear blade.

[0048] like Figure 4 As shown, the reference coordinate system includes the following key locations:

[0049] In-situ HP: When no cutting is performed, the shear blade remains stationary in the in-situ HP position;

[0050] The shearing position CP is where the flying shear accelerates from its original position HP during shearing. When the shear blade contacts the workpiece, shearing of the workpiece begins, and this position is the shearing position CP.

[0051] After the CRP is cut, the flying shear continues to rotate. The cutting is completed when the flying shear detaches from the workpiece and pushes the workpiece out. This position is the CRP after cutting.

[0052] The flying shear's movement process is as follows: Starting from speed 0 at its home position (HP), the flying shear accelerates until it reaches the shearing position (CP). It then moves at maximum speed to the shearing completion position (CRP) to complete the shearing action. Next, the flying shear decelerates forward until it stops. Finally, it performs a reverse crawling motion and stops precisely at its home position (HP). The reverse crawling motion is at a lower speed to ensure accurate stopping at HP. The forward and reverse crawling motions are primarily designed to reduce impact on the equipment.

[0053] The reference coordinate system setting module converts the in-situ HP, shear position CP, and shear completion position CRP information of the reference coordinate system into constant data that the controller can recognize and initializes them into the initial value database of the controller (PLC control program) for subsequent algorithm program calls.

[0054] The detection and calculation module acquires real-time, continuous position detection signals through incremental encoder 1. This invention uses an incremental encoder connected to the end of the flying shear motor shaft for detecting motor speed, with a gearbox as a transition link (the shear blade is connected to the motor shaft via a gearbox). To accurately feedback the real-time position of the flying shear blade, a rotation angle relationship between the shear blade, gearbox, and motor needs to be established in the detection and calculation module. The relationship is as follows:

[0055]

[0056] in,

[0057] The induction stop 3 is mounted on the upper shear blade connecting shaft 7 or the lower shear blade connecting shaft 8 via a 360° adjustable mounting ring 12. The mounting ring 12 is locked in place by a tightening bolt 13, and the induction stop 3 is mounted on the radial outer wall of the mounting ring 12. During installation, simply slip the mounting ring 12 onto the upper shear blade connecting shaft 7 or the lower shear blade connecting shaft 8, and then tighten it with the tightening bolt 13. For adjustment, loosen the tightening bolt 13, rotate the mounting ring 12 to the designated position, and then tighten the tightening bolt 13. The operation is simple and convenient.

[0058] In the detection and calculation module, the position of the shear blade is represented by an angle, and it rotates in one direction with the flying shear motor 4, with one rotation being 360°.

[0059] The position where the upper shear blade 10 and the lower shear blade 11 completely intersect, i.e., the lowest point of the upper shear blade 10, is marked as the cutting point of the flying shear. The cutting point is defined as 0° of the flying shear blade angle.

[0060] When the flying shear blade is in operation, it rotates along the direction of the workpiece movement. With 0° as the reference point, when it rotates to angle E, it is marked as the original position HP of the blade.

[0061] The correspondence between the shear blade angle position and the encoder pulse value is as follows:

[0062] When the shear blade is closed, the pulse value is 0 and the angle is 0°; when the shear blade is in the original position HP, the pulse value is M×i×A÷360° and the angle is E; when the shear blade rotates one revolution, the pulse value is M×i and the angle is 360°; M is the number of pulses emitted by the incremental encoder 1 when it rotates one revolution.

[0063] In this embodiment, the angle E is 90°, and the incremental encoder 1 generates 1024 pulses per revolution. That is, when the shear blade is in its original position HP, the pulse value is 256×i and the angle is 90°; when the shear blade rotates one revolution, the pulse value is 1024×i and the angle is 360°.

[0064] Of course, in other embodiments, the angle E can be set according to the actual working conditions, and an incremental encoder 1 with other pulse numbers can be selected according to actual needs.

[0065] The controller is a PLC. The process of establishing a reference point for the position of the shear blade in the calibration control module is called the in-situ calibration of the shear blade.

[0066] The calibration process is as follows:

[0067] Step 1: After turning the "In-situ Activation" switch of the PLC to the cancel position, operate the "Forward Climb" or "Reverse Climb" switch. The control command is sent to the calibration control module through the PLC. The calibration control module outputs a control signal to the driver, and then the driver controls the flying shear motor 4 to rotate the shear blade to the shearing position CP. After confirming that the shear blade is in the correct closed position, press the "Flying Shear Blade Calibration" button. The "Calibration" command is sent to the calibration control module. The detection and calculation module takes this point as the reference reference point in the pre-established reference coordinate system and sets it to 0°. The encoder pulse calculation value inside the detection and calculation module is initialized to 0. Simultaneously, the position of the shear blade is marked as HP at the reference reference point, which is rotated 90° along the rolling direction. After the data conversion and calculation are completed, the calibration control module feeds back a signal to the PLC. The PLC controls the "0-position calibration status indicator" to change from on to off, which means that the 0-position calibration is completed.

[0068] Step 2: After the 0-position calibration is completed, switch the "In-situ Activation" switch to the active position, and then click the "Flying Shear Reset" button. The calibration control module receives the shear blade reset command from the PLC and calls the detection and calculation module to execute the internally written program to control the flying shear blade to rotate at 5% of the rated speed along the workpiece movement direction. The detection and calculation module calculates the pulse data fed back by the incremental encoder 1 in real time. When the induction stop 3 blocks the proximity switch 2, the signal of the proximity switch 2 changes from 0 to 1, triggering the calibration control module to execute the memory program. The memory program records the encoder pulse data P0 at the moment the proximity switch signal changes. The P0 value is the accumulated pulse value detected by the flying shear motor 4 as it rotates from position 0 along the workpiece movement direction to the proximity switch position. The calibration control module continues to control the shear blade to rotate at 5% of the rated speed along the workpiece movement direction, controlling the shear blade to return to the original position HP and stop. Then switch the "In-situ Activation" switch to the cancel position. At this point, the flying shear in-situ calibration action is completed.

[0069] The calibration control module stores the successful calibration results in its internal program, achieving long-term validity (unless the system is powered off and restarted) after a single calibration.

[0070] After the driver trips and reconnects, the operator needs to perform the shear blade reset procedure to reset it. The flying shear rotates at 5% of the rated speed along the direction of the rolled piece movement. When the signal of proximity switch 2 changes from 0 to 1, the calibration control module automatically sets the current position of the flying shear to the memory value P0 of the 0-position calibration, and then positions the shear blade at 90°.

[0071] Recalibration is only required if the system needs to be reinitialized for special reasons or if the shear blade stops at the wrong position.

[0072] The proximity switch signal is only used during offline calibration; it does not function during normal shearing. This effectively avoids calibration failures caused by erroneous proximity switch signals during normal flying shear operation, reduces the flying shear's dependence on the proximity switch for normal operation, and improves the flying shear's reliability.

[0073] Compared to the original solution, this invention not only eliminates the need for an absolute encoder but also moves the shear blade position detection sensor away from the flying shear reducer, effectively avoiding the effects of mechanical vibration. This achieves the effects of system optimization, cost savings, reduced failure points, and lower accident rates.

[0074] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A flying shear blade calibration system based on an incremental encoder, comprising a controller, characterized in that, It also includes an incremental encoder (1), a proximity switch (2), and a sensing stop (3). The incremental encoder (1) is installed on the motor shaft (5) of the flying shear motor (4). The proximity switch (2) is installed on the side wall of the flying shear reducer (6). The sensing stop (3) is installed on the upper shear blade connecting shaft (7) or the lower shear blade connecting shaft (8) of the flying shear reducer (6). The proximity switch (2) and the shear blade point (9) are on the same vertical plane. When the upper shear blade (10) rotates to the lowest point, the proximity switch (2) can effectively sense the sensing stop (3). The controller is electrically connected to the incremental encoder (1), the proximity switch (2), and the flying shear motor (4). The controller includes a reference coordinate system setting module, a detection and calculation module, and a calibration control module. The reference coordinate system setting module is used to set the target position, speed and acceleration of the flying shear according to the process shearing requirements, generate the given control path and waveform curve of position and speed according to the principle of fastest response time, and then determine the reference coordinate system of the flying shear blade; The detection and calculation module is used to obtain the real-time position of the flying shear blade based on the incremental encoder (1) and the proximity switch (2); The calibration control module is used to establish a reference point for the position of the shear blade and to perform high-precision calibration control on the position of the flying shear blade. The rotation angle relationship between the "shear blade-reducer-motor" is established in the detection and calculation module as follows: ； in, , The reduction ratio of the flying shear reducer (6); In the detection and calculation module, the position of the shear blade is represented by an angle, and it rotates in one direction with the flying shear motor (4), with one rotation being 360°; The position where the upper shear blade (10) and the lower shear blade (11) completely intersect, that is, the lowest point of the upper shear blade (10), is marked as the cutting point of the flying shear. The cutting point is defined as 0° of the angle of the flying shear blade. When the flying shear blade is working, it rotates along the direction of the workpiece movement. With 0° as the reference point, when it rotates to angle E, it is marked as the original position (HP) of the blade. The correspondence between the shear blade angle position and the encoder pulse value is as follows: When the shear blade is closed, the pulse value is 0 and the angle is 0°; when the shear blade is in the original position (HP), the pulse value is M×i×A÷360° and the angle is E; when the shear blade rotates one revolution, the pulse value is M×i and the angle is 360°; M is the number of pulses emitted by the incremental encoder (1) when it rotates one revolution. When the angle E is 90°, the incremental encoder (1) generates 1024 pulses per revolution. The controller is a PLC. The process of establishing a reference point for the position of the shear blade in the calibration control module is called the in-situ calibration of the shear blade. The calibration process is as follows: Step 1: After turning the "In-situ Activation" switch of the PLC to the cancel position, operate the "Forward Climb" or "Reverse Climb" switch. The control command is sent to the calibration control module through the PLC. The calibration control module outputs the control signal to the driver. Then, the driver controls the flying shear motor (4) to rotate the shear blade to the shearing position (CP). After confirming that the shear blade is in the correct closed position, press the "Flying Shear Blade Calibration" button. The "Calibration" command is sent to the calibration control module. The detection and calculation module takes this point as the reference reference point in the pre-established reference coordinate system and sets it to 0°. The encoder pulse calculation value inside the detection and calculation module is initialized to 0. The shear blade is marked as the in-situ position (HP) at the reference reference point at the position 90° along the rolling direction. After the data conversion and calculation are completed, the calibration control module feeds back the signal to the PLC. The PLC controls the "0-position calibration status indicator" to change from on to off, which means the 0-position calibration is completed. Step 2: After the 0-position calibration is completed, turn the "Activate in place" switch to the input position and then click the "Reset flying shear" button. The calibration control module receives the shear blade reset command from the PLC and calls the detection and calculation module to execute the internally written program to control the flying shear blade to rotate at 5% of the rated speed along the direction of the workpiece movement. The detection and calculation module calculates the pulse data fed back by the incremental encoder (1) in real time. When the sensing stop (3) blocks the proximity switch (2), the signal of the proximity switch (2) changes from 0 to 1, triggering the calibration control module to execute the memory program. The memory program records the encoder pulse data P0 at the moment of the proximity switch signal change. The P0 value is the cumulative value of the pulse detected by the flying shear motor (4) rotating from the 0 position along the direction of the workpiece movement to the proximity switch position. The calibration control module continues to control the shear blade to rotate at 5% of the rated speed along the direction of the workpiece movement, and controls the shear blade to return to the original position (HP) and stop. Then switch the "Activate in place" switch to the cancel position. At this point, the flying shear in place calibration is complete. The calibration control module stores the successful calibration results in its internal program, achieving long-term validity of a single calibration.

2. The flying shear blade calibration system based on an incremental encoder according to claim 1, characterized in that, The reference coordinate system includes: In place (HP), the shear blade remains stationary in place (HP) when no cutting is being performed. The shearing position (CP) is the point at which the flying shear accelerates from its original position (HP) during shearing. When the shear blade contacts the workpiece, the shearing process begins. After shearing complete (CRP), the flying shear continues to rotate. Shearing is completed when the flying shear detaches from the workpiece and pushes the workpiece out. This position is called the shearing complete (CRP).

3. The flying shear blade calibration system based on an incremental encoder according to claim 2, characterized in that, The flying shear's movement process is as follows: the flying shear starts from 0 speed in its original position (HP) and accelerates until it reaches the cutting position (CP). The flying shear moves at its maximum speed at a constant speed to the cutting completion position (CRP) to complete the cutting action. Then, the flying shear performs a forward climbing deceleration movement until it stops. Finally, the flying shear performs a reverse climbing movement and stops accurately in its original position (HP).

4. A flying shear blade calibration system based on an incremental encoder according to claim 2, characterized in that, The reference coordinate system setting module converts the in-place (HP), shear position (CP), and shear completion position (CRP) information of the reference coordinate system into constant data that the controller can recognize and initializes them into the controller's initial value database for subsequent algorithm calls.

5. A flying shear blade calibration system based on an incremental encoder according to claim 1, characterized in that, The sensing stop (3) is mounted on the upper shear blade connecting shaft (7) or the lower shear blade connecting shaft (8) by a mounting ring (12) that can be adjusted 360°, and the mounting ring (12) is locked by a top bolt (13).

6. A flying shear blade calibration system based on an incremental encoder according to claim 1, characterized in that, After the driver trips and reconnects, the operator needs to perform the shear blade reset procedure to reset the shear blade. The flying shear rotates at 5% of the rated speed along the direction of the rolling stock. When the signal of the proximity switch (2) changes from 0 to 1, the calibration control module automatically sets the current position of the flying shear to the memory value P0 of the 0-position calibration, and then positions the shear blade at 90°.

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