Tobacco shredder cutter roller and blade positioning control system and its control method

Abstract

The present invention provides a method for controlling the position of a tobacco shredder cutter roller and blade positioning system, comprising: positioning the blades on the cutter roller at positions where the blades are tangent to the outer circle of the grinding wheel; positioning the blades on the cutter roller at blade replacement positions; controlling the blades to be at positions where the blades are tangent to the outer circle of the grinding wheel; controlling the blades to be at blade replacement positions; calculating the rotation angle and rotation speed of the cutter roller, and transmitting the rotation angle and rotation speed to the motor through a motion curve contour definition module; simultaneously, the encoder transmits the current position of the cutter roller, which it monitors in real time, to the cutter roller current position display screen through an encoder parameter setting module, a CPU, and a communication module; and rotating the remaining blades to the blade replacement positions in the same manner.

Description

Technical Field

[0001] This invention belongs to the field of tobacco processing technology and relates to a method for controlling the position of the cutter roller using a tobacco shredder cutter roller and blade positioning system. Background Technology

[0002] Tobacco processing is a crucial process for cigarette quality during production, and the shredder is a key piece of equipment in the tobacco processing production line. The cutter roller and blades are the core components of the shredder, directly impacting tobacco quality. Therefore, the maintenance, cleaning, upkeep, and blade replacement of the cutter roller and blades are particularly important. However, the cutter roller, weighing over half a ton, is heavy, has high inertia, and the blades are sharp. Furthermore, the cutter roller is connected to the drive motor. After the shredder finishes production, precisely positioning the blades—for example, determining the blade replacement position, the position where the blade is tangent to the outer circle of the grinding wheel, or observing and maintaining the blades at a specific location—is traditionally done by manually rotating the cutter roller at low speed. This method is time-consuming, labor-intensive, and extremely risky. A slight mishap can result in a cut finger, or even a life-threatening injury. Each blade replacement takes at least one hour, and cleaning and maintaining the cutter roller and blades takes at least 30 minutes. The manual positioning of the cutter roller and blades is not very precise, with low repeatability, and is also one of the more tedious and dangerous processes.

[0003] Chinese utility model patent application number CN204653760U discloses a control system for the blade roller of a tobacco shredder. Although this system achieves automatic control of the electric blade roller system, reducing the workload of manual blade operation, the blade roller and blades cannot be automatically positioned according to the set position. The positioning position needs to be determined manually by visually approaching the blade roller, resulting in poor positioning accuracy. The blade position must be repeatedly determined by manually moving the blade roller back and forth.

[0004] Furthermore, the blade positions on the cutter roller are numbered using traditional stamped markings; specifically, numerical stamped codes are printed on the side of the blade mounting base: 1, 2, 3… This numbering method makes it particularly difficult to identify the blade number and position after the equipment protective cover is closed. It is impossible to know which blade number is present in the operator's observation position.

[0005] The automatic, reliable, and safe positioning of the cutter roller and the blades on it is a problem that technicians urgently need to solve. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a method for controlling the position of the cutter roller and blades using a positioning system for the cutter roller and blades of a tobacco shredder. This method accurately positions the cutter roller and blades to preset positions without human contact with the rotating cutter roller. It reduces the risk of maintaining the cutter roller and blades and improves their maintenance efficiency.

[0007] The technical solution adopted by the present invention to achieve the above-mentioned technical objectives is as follows:

[0008] This invention discloses a positioning system for a tobacco shredder's cutting roller and blades. The system controls the position of several blades evenly mounted on a cutting roller of the tobacco shredder. The cutting roller is driven by a motor and also equipped with an encoder. A grinding wheel grinds one of the blades. The system includes a display and a driver. The display includes: a trigger key for the tangent position of the blade to the outer circle of the grinding wheel, a trigger key for changing the blade position, a blade selection key, a display of the current position of the cutting roller, and a return calibration trigger key, all connected to the driver. The driver includes: a communication module, a CPU, a motor mode and parameter setting module, and a user unit conversion calibration module. The motion curve profile definition module and encoder parameter setting module, along with the communication module, are bidirectionally connected to the display's trigger keys for the blade and grinding wheel outer circle tangency position, blade change position, blade selection, current position display of the cutter roller, and homing calibration trigger key, and also bidirectionally connected to the CPU. The CPU is bidirectionally connected to the motor mode and parameter setting module and the encoder parameter setting module. The motor mode and parameter setting module, the user unit conversion calibration module, and the motion curve profile definition module are sequentially connected. The encoder is bidirectionally connected to the encoder parameter setting module, and the output of the motion curve profile definition module is connected to the input of the motor.

[0009] The tobacco shredder cutting roller and blade positioning system of the present invention, wherein: there are 4-12 blades, which are respectively installed on the tangential direction of the circumference of the cutting roller.

[0010] The tobacco shredder cutter roller and blade positioning system of the present invention, wherein the blades are numbered sequentially along the circumference of the cutter roller in a clockwise or counterclockwise direction.

[0011] The tobacco shredder cutter roller and blade positioning system of the present invention, wherein the encoder and the cutter roller are located on the same axis.

[0012] The tobacco shredder cutter roller and blade positioning system of the present invention, wherein: the motor is a three-phase AC asynchronous servo motor or a three-phase AC synchronous servo motor.

[0013] The tobacco shredder cutter roller and blade positioning system of the present invention, wherein: the driver is an induction motor closed-loop vector driver or a servo controller.

[0014] The tobacco shredder cutter roller and blade positioning system of the present invention, wherein: the encoder is an absolute encoder or an incremental encoder.

[0015] The present invention relates to a positioning system for the cutter roller and blade of a tobacco shredder, wherein the display is an industrial computer or a touch screen.

[0016] The present invention relates to a method for controlling the position of a cutter roller using a tobacco shredder cutter roller and blade positioning system, wherein:

[0017] (a) Position the blades on the cutter roller at the points where the blades are tangent to the outer circumference of the grinding wheel.

[0018] The operator manually rotates the first blade on the cutter roller to the position tangent to the grinding wheel. Then, on the display, the operator presses the trigger key for the tangent position of the blade to the outer circle of the grinding wheel and the return calibration trigger key. Next, the operator presses the "1" button on the blade selection key on the display. The above instructions are transmitted to the CPU through the communication module. The CPU sends instructions to the encoder, instructing the encoder to detect the current position of the cutter roller. The encoder transmits the current position of the cutter roller to the CPU through the encoder parameter setting module. The CPU records and stores the current position of the cutter roller. The above operation is repeated for the remaining blades to complete the initialization of the tangent position of all blades to the outer circle of the grinding wheel.

[0019] (ii) Position the blades on the cutter roller at the blade replacement positions.

[0020] The operator manually rotates the first blade on the cutter roller to the blade replacement position, then presses the blade and blade replacement position trigger key and the return calibration trigger key on the display; then presses the "1" button on the blade selection key on the display. The above instructions are transmitted to the CPU through the communication module. The CPU sends instructions to the encoder to detect the current position of the cutter roller. The encoder transmits the above position to the CPU through the encoder parameter setting module. The CPU records and stores the current position of the cutter roller. The above operation is repeated for the remaining blades to complete the initialization of the blade replacement position for all blades.

[0021] (iii) Control the cutting tool to position it tangent to the outer circumference of the grinding wheel.

[0022] If it is necessary to rotate the first blade to the position tangent to the outer circle of the grinding wheel, the operator presses the "1" button on the trigger key for the tangent position of the blade to the outer circle of the grinding wheel and the selection key on the display. The above instructions are transmitted to the CPU through the communication module. At the same time, the CPU obtains the current position of the cutter roller through the encoder and encoder parameter setting module. The CPU compares the current position of the first blade with the initial position in step (1). Then, through the motor mode and parameter setting module, user unit conversion calibration module, and motion curve contour definition module, the CPU calculates the rotation angle and rotation speed of the cutter roller from the current position to the position tangent to the outer circle of the grinding wheel. The rotation angle and rotation speed are transmitted to the motor through the motion curve contour definition module. At the same time, the encoder transmits the current position of the cutter roller monitored in real time to the cutter roller current position display on the display through the encoder parameter setting module, CPU, and communication module. The remaining blades are rotated to the position tangent to the outer circle of the grinding wheel in the same way.

[0023] (iv) Control the blade and position it in the blade replacement position.

[0024] If it is necessary to rotate blade number one to the blade replacement position, the operator presses the "1" button on the blade replacement position trigger key and blade selection key on the display. The above instructions are transmitted to the CPU through the communication module. At the same time, the CPU obtains the current position of the blade roller through the encoder and encoder parameter setting module. The CPU compares the current position of blade number one with the initial position in step (two). Then, the CPU calculates the rotation angle and rotation speed of the blade roller through the motor mode and parameter setting module, user unit conversion calibration module, and motion curve contour definition module. The rotation angle and rotation speed are transmitted to the motor through the motion curve contour definition module. At the same time, the encoder transmits the current position of the blade roller monitored in real time to the blade roller current position display screen on the display through the encoder parameter setting module, CPU, and communication module. The remaining blades are rotated to the blade replacement position in the same way.

[0025] The present invention relates to a method for controlling the position of a cutter roller using a tobacco shredder cutter roller and blade positioning system, wherein: the blade changing position is any position on the circumference of the cutter roller specified by the operator, except for the position where the blade is tangent to the outer circle of the grinding wheel.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention allows for precise control of the cutter roller and any blade on it, ensuring they remain at the required maintenance, repair, and observation position without manual intervention. The stopping position is accurate, and the repeatability is high. This improves maintenance efficiency and enhances operator safety.

[0028] 2. The traditional method of marking the blade position on the shredder's blade roller is to use a steel stamp to mark the number on the blade mounting base. This invention realizes the electronic digital numbering function of the blade through automatic position positioning, and displays the processed blade number on the human-machine interface in real time. At the same time, it ensures that it corresponds one-to-one with the steel stamp number on the actual blade base, solving the problem of identification of traditional steel stamp blade numbers after the blade roller is closed and at a distance.

[0029] 3. This invention improves the automation and intelligence level of tobacco equipment, thereby enhancing the equipment's market competitiveness.

[0030] 4. This invention meets the needs of cigarette factories for convenient and safe operation during the maintenance of the shredder's cutter rollers. Based on modern sensor and motion control technology, it automatically and precisely positions the shredder's cutter rollers to target locations, enabling automated and intelligent maintenance of the cutter rollers and blades in the workshop. It reduces the intensity of manual labor in the workshop, protects personnel safety, and improves production quality and efficiency through automated and intelligent motion technology. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a tobacco shredder cutter roller and blade positioning system according to the present invention;

[0032] Figure 2 This is a schematic diagram showing the connection relationship between various modules in the cutting roller and positioning system of a tobacco shredder provided by the present invention.

[0033] exist Figure 1 and Figure 2 In this diagram, label 1 represents the display; label 2 represents the driver; label 3 represents the encoder; label 4 represents the blade; label 5 represents the motor; label 6 represents the cutter roller; label 7 represents the communication module; label 8 represents the CPU; label 9 represents the motor mode and parameter setting module; label 10 represents the user unit conversion and calibration module; label 11 represents the motion curve contour definition module; label 12 represents the encoder parameter setting module; label 13 represents the trigger key for the tangent position between the blade and the outer circle of the grinding wheel; label 14 represents the trigger key for changing the blade position; label 15 represents the blade selection key; label 16 represents the display screen of the current position of the cutter roller; label 17 represents the return calibration trigger key; and label 18 represents the grinding wheel. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] like Figure 1 As shown, the positioning system of the tobacco shredder cutter roller and blades of the present invention controls the position of eight blades 4 uniformly mounted on the tobacco shredder cutter roller 6. The blades 8 are respectively installed on the tangential direction of the circumference of the cutter roller 6. The blades 4 are numbered sequentially along the clockwise or counterclockwise direction of the circumference of the cutter roller 6. The encoder 3, the cutter roller 6 and the motor 5 are located on the same axis. The cutter roller 6 is driven by the motor 5. The encoder 3 is also mounted on the cutter roller 6. The grinding wheel 18 grinds one of the blades 4.

[0036] like Figure 2As shown, the system includes: display 1 and driver 2. Display screen 1 includes: a trigger key 13 for the tangent position of the blade to the outer circle of the grinding wheel, a trigger key 14 for changing the blade position, a blade selection key 15, a display screen 16 for the current position of the cutter roller, and a return calibration trigger key 17, all connected to driver 2. Driver 2 includes: a communication module 7, a CPU 8, a motor mode and parameter setting module 9, a user unit conversion calibration module 10, a motion curve contour definition module 11, and an encoder parameter setting module 12. Communication module 7 is bidirectionally connected to the trigger keys 13, 14, 15, 16, and 17 on display screen 1, and bidirectionally connected to CPU 8. CPU 8 is bidirectionally connected to the motor mode and parameter setting module 9 and the encoder parameter setting module 12. The motor mode and parameter setting module 9, the user unit conversion calibration module 10, and the motion curve contour definition module 11 are sequentially connected. Encoder 3 is bidirectionally connected to encoder parameter setting module 12, and the output of motion curve contour definition module 11 is connected to the input of motor 5.

[0037] Motor 5 is a three-phase AC asynchronous servo motor or a three-phase AC synchronous servo motor. Driver 2 is an induction motor closed-loop vector driver or a servo controller. Encoder 3 is an absolute encoder or an incremental encoder. Display 1 is an industrial computer or a touch screen.

[0038] The method of controlling the position of the cutter roller using a tobacco shredder cutter roller and blade positioning system of the present invention includes the following steps:

[0039] (a) Position the blades on the cutter roller at the points where the blades are tangent to the outer circumference of the grinding wheel.

[0040] The operator manually rotates the first blade 4 on the cutter roller 6 to a position tangent to the grinding wheel 18. Then, on the display 1, the operator presses the trigger key 13 for the tangent position of the blade to the outer circle of the grinding wheel and the return calibration trigger key 17. Next, the operator presses the "1" button on the blade selection key 15 on the display 1. The above instructions are transmitted to the CPU 8 through the communication module 7. The CPU 8 sends instructions to the encoder 3 to detect the current position of the cutter roller 6. The encoder 3 transmits the current position of the cutter roller 6 to the CPU 8 through the encoder parameter setting module 12. The CPU 8 records and stores the current position of the cutter roller 6. The above operation is repeated for the remaining blades 4 to complete the initialization of the tangent position of all blades 4 to the outer circle of the grinding wheel 18.

[0041] (ii) Position the blades on the cutter roller at the blade replacement positions.

[0042] The operator manually rotates the first blade 4 on the cutter roller 6 to the blade replacement position, and then presses the blade and blade replacement position trigger key 14 and the return calibration trigger key 17 on the display 1; then presses the "1" button on the blade selection key 15 on the display 1. The above instructions are transmitted to the CPU8 through the communication module 7. The CPU8 sends instructions to the encoder 3 to detect the current position of the cutter roller 6. The encoder 3 transmits the above position to the CPU8 through the encoder parameter setting module 12. The CPU8 records and stores the current position of the cutter roller 6. The above operation is repeated for the remaining blades 4 to complete the initialization of the blade replacement position of all blades 4.

[0043] (iii) Control the cutting tool to position it tangent to the outer circumference of the grinding wheel.

[0044] If it is necessary to rotate the first blade 4 to the position tangent to the outer circle of the grinding wheel 18, the operator presses the trigger key 13 for the tangent position of the blade to the outer circle of the grinding wheel and the "1" key on the blade selection key 15 on the display 1. The above instructions are transmitted to the CPU 8 through the communication module 7. At the same time, the CPU 8 obtains the current position of the cutter roller 6 through the encoder 3 and the encoder parameter setting module 12. The CPU 8 compares the current position of the first blade 4 with its initial position in step one, and then calculates the rotation angle and rotation speed of the cutter roller 6 from the current position to the position tangent to the outer circle of the grinding wheel through the motor mode and parameter setting module 9, the user unit conversion calibration module 10, and the motion curve contour definition module 11. The rotation angle and rotation speed are then transmitted to the motor 5 through the motion curve contour definition module 11. At the same time, the encoder 3 transmits the current position of the cutter roller 6, which it monitors in real time, to the cutter roller current position display screen 16 on the display 1 through the encoder parameter setting module 12, the CPU 8, and the communication module 7. The remaining blades 4 are rotated to the position tangent to the outer circle of the grinding wheel 18 in the same way.

[0045] (iv) Control the blade and position it in the blade replacement position.

[0046] If it is necessary to rotate the first blade 4 to the blade replacement position, the operator presses the "1" button on the blade replacement position trigger key 14 and the blade selection key 15 on the display 1. The above instructions are transmitted to the CPU8 through the communication module 7. At the same time, the CPU8 obtains the current position of the cutter roller 6 through the encoder 3 and the encoder parameter setting module 12. The CPU8 compares the current position of the first blade 4 with the initial position in step two. Then, the CPU8 calculates the rotation angle and rotation speed of the cutter roller 6 through the motor mode and parameter setting module 9, the user unit conversion calibration module 10, and the motion curve contour definition module 11. The rotation angle and rotation speed are transmitted to the motor 5 through the motion curve contour definition module 11. At the same time, the encoder 3 transmits the current position of the cutter roller 6, which it monitors in real time, to the cutter roller current position display screen 16 on the display 1 through the encoder parameter setting module 12, the CPU8, and the communication module 7. The remaining blades 4 are rotated to the blade replacement position in the same way. The blade replacement position is any position on the circumference of the cutter roller 6, except for the position where the blade is tangent to the outer circle of the grinding wheel, as specified by the operator.

[0047] The drive roller 6 runs at a speed of 1-3 rpm. As the roller 6 rotates, the position difference of the target blade 4 gradually decreases. When the difference is 0, the target blade 4 on the roller 6 stops at the specified operating position, completing the positioning function of the roller 6 and the blade 6. The positioning accuracy is ≤0.01º. The position value of the roller during the positioning process is displayed in real time on the display screen 16 of the display 1.

[0048] The motor mode and parameter setting module 9 functions by having the driver read the rated voltage, rated current, rated frequency, rated speed, rated torque, and number of poles of the cutter roller drive motor 5 via the power data communication cable. After inputting the data from encoder 3, it creates a vector model for speed and torque control of the cutter roller motor. Precise control ensures that the motor output torque reaches 100% of the rated torque from zero speed to rated speed, achieving constant torque output. Precise control also ensures that the error between the actual speed and the set speed of motor 5 in steady state is within 0.1%, indirectly controlling the rotation direction, speed, and torque of the cutter roller 6. This guarantees smooth, vibration-free low-speed positioning and rotation of the half-ton multi-pound cutter roller at 1-3 rpm.

[0049] The user unit conversion and calibration module 11 reads the rotational speed and pulses of the encoder 3 and converts its electrical units into the rotational positioning angle units of the cutter roller 6. The cutter roller 6 rotates 360 degrees in one revolution, so the physical unit for rotational positioning on the circumference of the cutter roller 6 is the angle unit "degree".

[0050] The motion curve contour definition module 11 precisely defines the motion curve characteristic parameters of the cutter roller 6 drive motor 5, including the motor 5's endpoint position, acceleration, deceleration, jerk, acceleration time, deceleration time, running speed, start and stop methods, anti-vibration parameters, and automatically generates the motion characteristic curve of the cutter roller 6 drive motor. With the motion characteristic curve, the cutter roller 6, driven by the motor 5, can smoothly and accurately stop at the target endpoint position from the starting point, by activating acceleration, deceleration, jerk, acceleration, deceleration time, and running speed control parameters. This completes the positioning function of the cutter roller 6 and the blade 4.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for controlling the position of a tobacco shredder cutter roller and blade positioning system, wherein the tobacco shredder cutter roller and blade positioning system controls the position of a plurality of blades (4) uniformly mounted on a tobacco shredder cutter roller (6), the cutter roller (6) is driven by a motor (5), an encoder (3) is also mounted on the cutter roller (6), and a grinding wheel (18) grinds one of the blades (4). The tobacco shredder cutter roller and blade positioning system comprises: The display (1) and driver (2) include: a trigger key (13) for the tangent position of the blade and the outer circle of the grinding wheel, a trigger key (14) for changing the blade position, a blade selection key (15) for selecting the blade, a display screen (16) for the current position of the cutter roller, and a return calibration trigger key (17) connected to the driver (2); the driver (2) includes: a communication module (7), a CPU (8), a motor mode and parameter setting module (9), a user unit conversion calibration module (10), a motion curve contour definition module (11), and an encoder parameter setting module (12). The communication module (7) is connected to the trigger key for the tangent position of the blade and the outer circle of the grinding wheel on the display (1). (13) The blade position change trigger key (14) and the blade selection key (15) are bidirectionally connected to the current position display of the cutter roller (16) and the return calibration trigger key (17), and bidirectionally connected to the CPU (8). The CPU (8) is bidirectionally connected to the motor mode and parameter setting module (9) and the encoder parameter setting module (12). The motor mode and parameter setting module (9), the user unit conversion calibration module (10), and the motion curve contour definition module (11) are connected in sequence. The encoder (3) is bidirectionally connected to the encoder parameter setting module (12), and the output end of the motion curve contour definition module (11) is connected to the input end of the motor (5). The method for controlling the position of the cutter roller using a tobacco shredder cutter roller and blade positioning system comprises the following steps: (a) Position the blades on the cutter roller at the points where the blades are tangent to the outer circumference of the grinding wheel. The operator manually rotates the first blade (4) on the cutter roller (6) to a position tangent to the grinding wheel (18), and then presses the trigger key (13) for the tangent position of the blade to the outer circle of the grinding wheel and the return calibration trigger key (17) on the display (1); then presses the "1" button on the blade selection key (15) on the display (1). The above instructions are transmitted to the CPU (8) through the communication module (7). The CPU (8) sends instructions to the encoder (3) to detect the current position of the cutter roller (6). The encoder (3) transmits the current position of the cutter roller (6) to the CPU (8) through the encoder parameter setting module (12). The CPU (8) records the current position of the cutter roller (6) and stores it. The above operation is repeated for the remaining blades (4) to complete the initialization of the tangent position of all blades (4) to the outer circle of the grinding wheel (18). (ii) Position the blades on the cutter roller at the blade replacement positions. The operator manually rotates the first blade (4) on the cutter roller (6) to the position for changing the blade, and then presses the blade and blade changing position trigger key (14) and the return calibration trigger key (17) on the display (1); then presses the "1" button on the blade selection key (15) on the display (1). The above instructions are transmitted to the CPU (8) through the communication module (7). The CPU (8) sends instructions to the encoder (3) to let the encoder (3) detect the current position of the cutter roller (6). The encoder (3) transmits the above position to the CPU (8) through the encoder parameter setting module (12). The CPU (8) records the current position of the cutter roller (6) and stores it. The above operation is repeated for the remaining blades (4) to complete the initialization of the blade changing position of all blades (4). (iii) Control the cutting tool to position it tangent to the outer circumference of the grinding wheel. If it is necessary to rotate the first blade (4) to the position tangent to the outer circle of the grinding wheel (18), the operator presses the "1" key on the display (1) for triggering the position of the blade tangent to the outer circle of the grinding wheel (13) and the "1" key on the blade selection key (15). The above instructions are transmitted to the CPU (8) through the communication module (7). At the same time, the CPU (8) obtains the current position of the cutter roller (6) through the encoder (3) and the encoder parameter setting module (12). The CPU (8) compares the current position of the first blade (4) with the initial position of its step (1), and then converts the position through the motor mode and parameter setting module (9) and the user unit conversion. The calibration module (10) and the motion curve contour definition module (11) calculate the rotation angle and rotation speed of the cutter roller (6) from its current position to the position tangent to the outer circle of the grinding wheel, and transmit the rotation angle and rotation speed to the motor (5) through the motion curve contour definition module (11). At the same time, the encoder (3) transmits the current position of the cutter roller (6) monitored in real time to the cutter roller current position display screen (16) of the display (1) through the encoder parameter setting module (12), CPU (8) and communication module (7); the remaining blades (4) rotate in the same way to the position where the blade (4) is tangent to the outer circle of the grinding wheel (18); (iv) Control the blade and position it in the blade replacement position. If it is necessary to rotate the first blade (4) to the blade replacement position, the operator presses the "1" key on the blade replacement position trigger key (14) and the blade selection key (15) on the display (1). The above instructions are transmitted to the CPU (8) through the communication module (7). At the same time, the CPU (8) obtains the current position of the cutter roller (6) through the encoder (3) and the encoder parameter setting module (12). The CPU (8) compares the current position of the first blade (4) with the initial position in step (two). Then, the CPU (8) uses the motor mode and parameter setting module to... The block (9), user unit conversion calibration module (10) and motion curve contour definition module (11) calculate the rotation angle and rotation speed of the cutter roller (6), and transmit the rotation angle and rotation speed to the motor (5) through the motion curve contour definition module (11). At the same time, the encoder (3) transmits the current position of the cutter roller (6) monitored in real time to the cutter roller current position display screen (16) of the display (1) through the encoder parameter setting module (12), CPU (8) and communication module (7); the remaining blades (4) rotate to the blade replacement position in the same way.

2. The method as described in claim 1, characterized in that: The blade replacement position is any position on the circumference of the blade (4) on the cutter roller (6), except for the position where the blade is tangent to the outer circle of the grinding wheel, as specified by the operator.

3. The method as described in claim 2, characterized in that: There are 4-12 blades (4), which are installed on the tangential direction of the circumference of the cutter roller (6).

4. The method as described in claim 3, characterized in that: The blades (4) are numbered sequentially in a clockwise or counterclockwise direction along the circumference of the blade roller (6).

5. The method as described in claim 4, characterized in that: The encoder (3) and the cutter roller (6) are located on the same axis.

6. The method as described in claim 5, characterized in that: The motor (5) is a three-phase AC asynchronous servo motor or a three-phase AC synchronous servo motor.

7. The method as described in claim 6, characterized in that: The driver (2) is either a closed-loop vector driver for an induction motor or a servo controller.

8. The method as described in claim 7, characterized in that: The encoder (3) is an absolute encoder or an incremental encoder.

9. The method as described in claim 8, characterized in that: The display (1) is an industrial computer or a touch screen.

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