Intelligent blade holder real-time online detection and control method

Abstract

The application belongs to the field of cooling flake, and discloses a kind of intelligent flake machine tool rest real-time online detection and control method, including adjusting the distance between scraper and rotating drum, so that scraper is close to the surface of rotating drum, then sensor is installed outside rotating drum;The distance value between current flow sensor and rotating drum is recorded in controller as preset value;Sensor detects the distance value between itself and rotating drum in real time;The actual value obtained is compared with the preset value, a difference value is formed, and the positive and negative of the difference value is determined;According to the difference value, the scraper is controlled to be close to or away from the rotating drum;The scraper changes with the change of the outer contour of the rotating drum, eliminates the risk of the scraper hitting the outer contour, prolongs the service life of the rotating drum and the whole flake machine, and solves the problem that the rotating drum is always damaged by the scraper.

Description

Technical Field

[0001] This invention belongs to the field of cooling and condensing, specifically relating to a method for real-time online detection and control of the blade holder of an intelligent condensing machine. Background Technology

[0002] The caustic soda flake machine is a device that solidifies molten alkali with a concentration of approximately 70%-99.5% to produce caustic soda flakes. The main structure of this equipment includes a rotating drum and an alkali tank immersed below the drum. When the drum rotates, the part of the drum surface in the alkali tank adheres to the alkali solution and carries the caustic soda away from the alkali tank. The drum is equipped with a cooling device to cool down the molten alkali adhering to the drum surface. As the drum rotates, the caustic soda is solidified. A scraper is provided on the side of the drum to scrape the dried alkali off the drum in flakes, thus forming the product caustic soda flakes.

[0003] In the above process, in order to ensure the quality of caustic soda flakes, it is necessary to ensure that the caustic soda has been solidified when it reaches the scraper. This requires that the caustic soda has sufficient cooling and solidification time from the caustic soda tank to the scraper position. Therefore, the drum diameter is usually set to be large and the cooling efficiency is high. In order for the drum to contact the caustic soda tank, the drum is set to be horizontal and the drum diameter is large. Over time, due to mechanical wear, the drum will inevitably be biased.

[0004] In addition, the inner wall of the drum uses cooling water to cool the alkali solution. Since the outer wall of the drum needs to transfer heat and bear the transmission torque, it is affected by the pressure of the alkali solution, thermal expansion and contraction under large temperature difference, and mechanical vibration. The drum is prone to deformation, dents, or bulges, which changes the distance between the drum surface and the scraper. Ultimately, the effect of caustic soda flakes cannot be guaranteed, or there may be incomplete scraping, forming secondary alkali that affects the quality of caustic soda flakes and causes a sharp decrease in the life of the scraper. The most fatal problem is that when the drum is deformed too much, the scraper is afraid of hitting the drum, causing scratches on the drum surface. After the drum surface is scratched, the amount of caustic soda flakes increases and the quality decreases, which can easily lead to secondary caking and affect the sale of caustic soda flakes.

[0005] The conventional approach to solving these problems is to add a laser sensor to the outside of the drum. This sensor detects the thickness of the caustic soda flakes on the drum and the distance between the scraper and the drum blades. However, the laser sensor is often obstructed by caustic soda dust, preventing it from accurately reflecting the distance between the scraper and the drum. This leads to an imbalance in the scraper adjustment distance and uneven scraping of the caustic soda flakes. Contact sensors are susceptible to corrosion from caustic soda, and the presence of caustic soda can cause inaccurate measurements and, in extreme cases, damage the sensor. Using electromagnetic induction sensors is problematic because the high-temperature environment inside the flake forming machine easily demagnetizes the sensor, preventing it from operating for extended periods.

[0006] In addition to the inability of general sensors to achieve the detection purpose, there are also problems at the execution level such as insufficient adjustment accuracy of the scraper and incorrect adjustment data. If the adjustment data is incorrect, it may cause the scraper to directly hit the drum, resulting in scratches and damage to the drum and damage to the scraper. For production lines with larger drums, if this equipment fails to work, the entire system will be paralyzed, resulting in huge economic losses.

[0007] Therefore, how to prevent the scraper and the drum from colliding, and how to precisely control the distance between the scraper and the drum, have been difficult problems to solve in this field. Summary of the Invention

[0008] The purpose of this application is to provide a method for real-time online detection and control of the blade holder of an intelligent sheeter, so as to achieve precise control of the distance between the scraper and the drum.

[0009] To achieve the above objectives, the intelligent slagging machine tool holder real-time online detection and control method provided in this application includes the following steps:

[0010] Step 1: Adjust the distance between the scraper and the drum so that the tip of the scraper is close to the surface of the drum;

[0011] Step 2: Install the eddy current sensor. The eddy current sensor is installed on the outside of the drum. The eddy current sensor and the scraper are located at different positions on the outside of the drum. The eddy current sensor is used to measure the distance between the scraper and the surface of the drum.

[0012] Step 3: Record the current distance between the eddy current sensor and the drum in the controller as a preset value;

[0013] Step 4: The eddy current sensor detects the distance between itself and the drum in real time, continuously collecting 5,000-20,000 values ​​per second. These values ​​are then transmitted to the controller. During the calculation, the controller automatically ignores invalid values ​​with fluctuations exceeding 0.5 mm. The remaining values ​​are averaged to form the actual distance between the eddy current sensor and the drum for that second.

[0014] Step 5: The controller compares the obtained actual value with the preset value, forms a difference, and determines the sign of the difference;

[0015] Step Six: When the difference in Step Five is negative, it means that the distance between the drum and the scraper has shortened. Control the scraper to move away from the drum by the difference distance. When the difference is positive, it means that the distance between the drum and the scraper has lengthened. Control the scraper to move closer to the drum by the difference distance.

[0016] Step 7: After the controller determines that the scraper has moved into place, it uses the distance between the eddy current sensor and the drum at this time as the preset value for the next judgment.

[0017] Step 8: Repeat steps 4 through 7.

[0018] The beneficial effects achieved by the above method in this application are as follows:

[0019] 1. This solution simulates the distance between the scraper and the drum by simulating the distance between the sensor and the drum, avoiding direct detection at the scraper position. In the initial installation position, the scraper can be as close to the drum as possible to ensure that all caustic soda flakes are scraped off. The eddy current sensor is installed at a greater distance from the drum, making maintenance and repair more convenient, reducing contact between caustic soda dust and the sensor, and avoiding corrosion. This not only enables real-time measurement of the distance between the scraper and the drum, but also facilitates the installation of the sensing equipment. It also allows for separate adjustment of the eddy current sensor and the scraper, so that the two adjustments can be made independently while maintaining a one-to-one correspondence in the measurement.

[0020] 2. In the controller, the sensor's collected values ​​are continuous analog values. For sensors susceptible to magnetic field interference from the environment, additional filtering and noise reduction circuitry is required. This solution directly transmits the sensor's collected values ​​to the controller. The controller discards values ​​with large discrepancies and then averages the remaining relatively consistent values. This average is used as the actual measured value, effectively removing data interference. This eliminates the need for additional circuitry and electrical components, avoiding the potential for malfunctions associated with excessive electrical components.

[0021] 3. The sensor monitors the deformation value of the drum surface every second to achieve real-time monitoring. When the outer contour of the drum deforms, the scraper adjusts its distance accordingly, so that the distance between the scraper and the drum remains constant. This solves the problem that the scraper could not adjust with the deformation of the outer contour of the drum, resulting in short scraper life and easy scratching of the drum, and thus reduced caustic soda quality.

[0022] Preferably, in step one, the distance between the scraper and the drum is adjusted by first bringing the scraper into contact with the drum surface, and then controlling the scraper to retract to a range of 0.05-0.1mm. At this point, the controller records the scraper's position as the initial position and marks it as position 0. The main purpose of the scraper is to scrape off the alkali adhering to the drum. Actual testing has shown that when the scraper is 0.05-0.1mm away from the drum surface, the alkali layer on the drum will completely detach from the drum due to the interaction of the solid alkali, achieving complete alkali removal without damaging the drum.

[0023] Preferably, the eddy current sensor is selected to meet the requirements of a measurement range of 0~20mm, an accuracy of 1~5 micrometers, and an accuracy that does not change between 0~120 degrees Celsius.

[0024] Those skilled in the art believe that eddy current sensors are significantly affected by temperature and magnetic fields, and their cost is generally dozens of times higher than that of photoelectric sensors. Eddy current sensors are also susceptible to corrosion by chemicals. For these reasons, those skilled in the art would not readily consider the use of eddy current sensors in the chemical industry.

[0025] The client's conventional thinking led to the selection of an eddy current sensor for this solution. However, practical verification has shown that the eddy current sensor used must meet the following requirements: a measurement range of 0~20mm, an accuracy of 1~5 micrometers, and an eddy current sensor whose accuracy does not change between 0~120 degrees Celsius.

[0026] Eddy current sensors are unaffected by the thickness of the coating on the drum surface, eliminating the need for magnetic and electric fields and reducing circuitry. The non-contact nature of the sensor allows it to measure minute distance changes between the scraper and the drum. The selected eddy current sensor parameters must meet the following requirements: a measurement range of 0-20 mm, an accuracy of 1-5 micrometers, and consistent accuracy between 0-120 degrees Celsius. Although the sensor is still susceptible to magnetic interference from factors such as arc welding, inductive motors, or other sources of electromagnetic radiation, this solution employs continuous acquisition of 5000-20000 values ​​per second, transmitting these values ​​to the controller. The controller automatically ignores invalid values ​​with fluctuations exceeding 0.5 mm during calculations to eliminate interference.

[0027] Preferably, in step two, an adjustment frame is provided for measuring the angle between the eddy current sensor and the drum. The adjustment frame includes a support tube, a bracing tube, and a rotating joint. The bracing tube is connected to one end of the support tube, and the two tubes are internally connected. A mounting tube is hinged to the bracing tube. The body of the eddy current sensor is fixed inside the mounting tube. The wires of the eddy current sensor pass through the bracing tube and then through the support tube. The rotating joint connects the mounting tube and the support tube and is used to adjust the angle of the mounting tube. During use, both the support tube and the bracing tube are fixed to the machine base. A flexible hose is used to connect the rotating shaft of the rotating joint, and a flexible hose is used to connect the support tube and the bracing tube.

[0028] The eddy current sensor must be kept perpendicular to the drum. However, due to the working environment, the eddy current sensor may not be perfectly aligned. This design incorporates an adjustment bracket to address this issue. When the eddy current sensor is not perfectly aligned, the rotating joint, support tube, and diagonal brace form a triangle. Adjusting the curvature of the rotating joint, i.e., adjusting its effective length, allows for adjustment. With the support tube stationary, a mounting tube is hinged to the diagonal brace. The eddy current sensor body is fixed inside the mounting tube. Changing the angle of the diagonal brace changes the angle of the eddy current sensor, thus ensuring a perpendicular alignment with the drum. Furthermore, the mounting tube and support tube protect the wires from alkali corrosion.

[0029] Preferably, the end of the eddy current sensor is equipped with an alkali-resistant protective cover. The protective cover can protect the sensor from corrosion and damage caused by alkali during production.

[0030] Preferably, the scraper is equipped with a power mechanism for adjusting the scraper. The power mechanism includes a servo motor, a planetary reducer, and an adjusting rod. The output shaft of the servo motor is mounted on the planetary reducer. The adjusting rod is located inside the output hole of the planetary reducer. The servo motor rotates forward and backward to drive the adjusting rod forward and backward. The scraper is mounted on the end of the adjusting rod. The forward and backward movement of the adjusting rod causes the scraper to move closer to or away from the drum.

[0031] The distance between the scraper and the drum must be kept consistent. When the outer contour of the drum deforms, the scraper must also deform accordingly. This solution uses a servo motor to drive a planetary reducer to rotate. The planetary reducer drives the adjusting rod to move linearly without rotating. The linear movement of the adjusting rod causes the scraper to move away from or closer to the drum, thus achieving adjustment at the scraper.

[0032] Preferably, to prevent the scraper from colliding with the drum under uncertain circumstances, the scraper is equipped with a rebound disc spring. The disc spring is installed between the adjusting rod and the scraper, and is used to quickly move the scraper away from the drum. The disc spring has a pre-set rebound force. When the scraper impacts the drum, its force exceeds the rebound force of the disc spring, and the disc spring quickly moves the scraper backward, preventing further damage to the drum.

[0033] Preferably, since the outer contour of the drum is large, in order to make the drum deformation value measured by the eddy current sensor the same as the drum deformation value at the scraper, and to facilitate the installation of the eddy current sensor, the distance between the scraper and the eddy current sensor along the drum arc length is 100~200mm.

[0034] Finally, because the drum has a cylindrical structure, multiple scrapers need to be arranged side-by-side along the axial direction to completely remove the alkali layer. The drum has multiple scrapers arranged axially, and multiple eddy current sensors are matched to these scrapers. Each of these eddy current sensors is connected to the input of a controller, and the servo motors on each scraper are connected to the output of the same controller. The multiple eddy current sensors and scrapers are controlled independently. By using multiple eddy current sensors to monitor each scraper individually, and employing a single controller to collect data from these sensors and control the movement of each scraper, electrical components are saved. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the real-time online detection system for the blade holder of an intelligent slagging machine.

[0036] Figure 2 Logic diagram of the real-time online detection method for the blade holder of an intelligent chipping machine;

[0037] The accompanying drawings in the instruction manual are labeled as follows: base 11, bearing seat 12, drum 2, eddy current sensor 31, wire 32, protective cover 41, back plate 42, mounting tube 43, rotating pair 44, hose 45, support tube 46, adjusting rod 5, scraper 51, servo motor 6, planetary reducer 7, disc spring 8. Detailed Implementation

[0038] The following detailed description of the intelligent wafer shaving machine tool holder real-time online detection and control method provided in this application includes the following steps:

[0039] Step S1: Adjust the scraper to be close to the drum, and keep a gap of 0.05-0.1mm between the drum and the scraper;

[0040] Step 2 S2: Install the eddy current sensor on the outside of the drum. The eddy current sensor and the scraper are located at different positions on the outside of the drum. The eddy current sensor is used to measure the distance between the scraper and the surface of the drum. The eddy current sensor should be selected to meet the requirements of a measurement range of 0~20mm, an accuracy of 1~5 micrometers, and an eddy current sensor whose accuracy does not change between 0~120 degrees Celsius.

[0041] Step 3 S3: Record the current distance between the eddy current sensor and the drum in the controller as a preset value;

[0042] Step 4 S4: The sensor detects the distance between itself and the drum in real time, continuously collecting 5000-20000 values ​​per second and transmitting the values ​​to the controller. When the controller is calculating, it automatically ignores invalid values ​​with fluctuations exceeding 0.5mm, and calculates the average of the remaining values ​​to form the actual value between the eddy current sensor and the drum for that second.

[0043] Step 5 S5: The controller compares the obtained actual value with the preset value, forms a difference, and determines the sign of the difference;

[0044] Step 6 S6: When the difference in Step 5 is negative, it means that the distance between the drum and the scraper has become shorter. Control the scraper to move away from the drum by the difference distance. When the difference is positive, it means that the distance between the drum and the scraper has become longer. Control the scraper to move closer to the drum by the difference distance.

[0045] Step 7 S7: After the controller determines that the scraper has moved into place, it uses the distance between the eddy current sensor and the drum at this time as the preset value.

[0046] Step 8 (S8): Repeat steps 4 (S4) to 7 (S7).

[0047] When the distance value of the drum position is directly collected by the eddy current sensor, it will be affected by the magnetic field and other unknown factors in the environment. The usual practice is to remove the signal of the eddy current sensor by passing it through additional filtering and noise reduction circuits.

[0048] This solution directly transmits the values ​​collected by the eddy current sensor to the controller. The controller discards the values ​​with large dispersion based on the collected values, and then averages the remaining values ​​that are basically the same. The average value is used as the actual measurement value, which achieves the purpose of removing data interference. This saves the need for additional circuits and electrical components and avoids the failure problems caused by too many electrical components.

[0049] The distance between the scraper 51 and the rotating drum 2 is adjusted as follows: first, the scraper 51 is brought into contact with the surface of the rotating drum 2, and then the scraper 51 is controlled to retract to a range of 0.05-0.1mm. At this time, the controller records the position of the scraper 51 as the initial position and marks the initial position as 0 in the controller. The main purpose of the scraper 51 is to scrape off the alkali on the rotating drum 2.

[0050] An adjustment frame is provided for measuring the angle between the eddy current sensor 31 and the drum 2. The adjustment frame includes a support tube 46, a bracing tube, and a rotating joint 44. The bracing tube is connected to one end of the support tube 46 and the two tubes are internally connected. An installation tube 43 is hinged to the bracing tube. The body of the eddy current sensor 31 is fixed inside the installation tube 43. The wire 32 of the eddy current sensor 31 passes through the bracing tube and then through the support tube 46. The rotating joint 44 is connected between the installation tube 43 and the support tube 46 and is used to adjust the angle of the installation tube 43. During use, the support tube 46 and the diagonal brace tube are both fixed to the machine base 11. The rotating shaft of the rotating pair 44 is connected by a flexible hose 45. The measured drum 2 is mounted on the machine base 11 through the bearing seat 12. The support tube 46 is fixed laterally to the vertical side of the machine base 11, and the diagonal brace tube is set obliquely upward and towards the drum 2. The connection between the support tube 46 and the diagonal brace tube is connected by a flexible hose 45. A back plate 42 is welded to the mounting tube 43, and the eddy current sensor 31 is installed on the back plate 42 by screws. After the eddy current sensor 31 is installed, the alkali-resistant protective cover 41 is installed by screws or other means. The protective cover 41 can protect the eddy current sensor 31 and prevent the alkali from corroding and damaging the sensor during production.

[0051] The wire 32 of the eddy current sensor 31 first passes through the inclined support tube, then through the flexible tube 45, and then out through the support tube to connect with the controller. This avoids the wire 32 of the eddy current sensor 31 from coming into contact with alkali or alkaline solution, thus preventing it from being corroded and damaged.

[0052] The eddy current sensor must be kept perpendicular to the drum. However, due to the working environment, the eddy current sensor may not be perfectly aligned. This design incorporates an adjustment bracket to address this issue. When the eddy current sensor is not perfectly aligned, the rotating joint, support tube, and diagonal brace form a triangle. Adjusting the curvature of the rotating joint, i.e., adjusting its effective length, allows for adjustment. With the support tube stationary, a mounting tube is hinged to the diagonal brace. The eddy current sensor body is fixed inside the mounting tube. Changing the angle of the diagonal brace changes the angle of the eddy current sensor, thus ensuring a perpendicular alignment with the drum. Furthermore, the mounting tube and support tube protect the wires from alkali corrosion.

[0053] The scraper is equipped with a power mechanism for adjusting the scraper. The power mechanism includes a servo motor 6, a planetary reducer 7, and an adjusting rod 5. The output shaft of the servo motor 6 is mounted on the planetary reducer 7. The adjusting rod 5 is installed in the output hole of the planetary reducer 7. The servo motor 6 drives the adjusting rod 5 to move forward and backward in both directions. The scraper 51 is installed at the end of the adjusting rod 5. The forward and backward movement of the adjusting rod 5 drives the scraper 51 to move closer to or away from the drum 2.

[0054] The distance between the scraper 51 and the drum 2 must be kept consistent. When the outer contour of the drum 2 is deformed, the scraper 51 must also deform accordingly. In this solution, the servo motor 6 drives the planetary reducer 7 to rotate. The planetary reducer 7 drives the adjusting rod 5 to move linearly, while the adjusting rod 5 does not rotate. The linear movement of the adjusting rod 5 drives the scraper 51 to move away from and closer to the drum 2, thus achieving the adjustment of the scraper 51.

[0055] To prevent the scraper 51 from colliding with the drum 2 under uncertain circumstances, the scraper 51 is equipped with a rebound disc spring 8. The disc spring 8 is installed between the adjusting rod 5 and the scraper 51, and is used to quickly move the scraper 51 away from the drum 2. The disc spring 8 has a pre-set rebound force. When the scraper 51 impacts the drum 2, its force exceeds the rebound force of the disc spring 8, and the disc spring 8 quickly moves the scraper backward, preventing the scraper 51 from further damaging the drum 2.

[0056] The drum 2 has multiple scrapers 51 axially mounted, and multiple eddy current sensors 31 matched with the scrapers 51. Each eddy current sensor is connected to the input of a controller, and the servo motors on the scrapers are connected to the output of the same controller. The multiple eddy current sensors and scrapers are controlled independently. The multiple scrapers are individually monitored by multiple eddy current sensors, and a single controller collects data from these sensors and controls the movement of each scraper, thus saving on electrical components.

[0057] The above embodiments are merely illustrative of the principles and functional effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for real-time online detection and control of the blade holder of an intelligent slagging machine, characterized in that: Includes the following steps: Step 1: Adjust the distance between the scraper and the drum so that the tip of the scraper is close to the surface of the drum; Step 2: Install the eddy current sensor. The eddy current sensor is installed on the outside of the drum. The eddy current sensor and the scraper are located at different positions on the outside of the drum. The eddy current sensor is used to measure the distance between the scraper and the surface of the drum. Step 3: Record the current distance between the eddy current sensor and the drum in the controller as a preset value; Step 4: The eddy current sensor detects the distance between itself and the drum in real time, continuously collecting 5,000-20,000 values ​​per second. These values ​​are then transmitted to the controller. During the calculation, the controller automatically ignores invalid values ​​with fluctuations exceeding 0.5 mm. The remaining values ​​are averaged to form the actual distance between the eddy current sensor and the drum for that second. Step 5: The controller compares the obtained actual value with the preset value, forms a difference, and determines the sign of the difference; Step Six: When the difference in Step Five is negative, it means that the distance between the drum and the scraper has become shorter. Control the scraper to move away from the drum by the difference distance. When the difference is positive, it means that the distance between the drum and the scraper has become longer. Control the scraper to move closer to the drum by the difference distance. Step 7: After the controller determines that the scraper has moved into position, it uses the distance between the eddy current sensor and the drum at this time as the preset value for the next judgment. Step 8: Repeat steps 4 through 7; In step one, the distance between the scraper and the drum is adjusted by first bringing the scraper into contact with the surface of the drum, and then controlling the scraper to retract to a range of 0.05-0.1mm. At this time, the controller records the position of the scraper as the initial position and marks the initial position as 0 in the controller. In step two, an adjustment frame is provided for measuring the angle between the eddy current sensor and the drum. The adjustment frame includes a support tube, a bracing tube, and a rotating joint. The bracing tube is connected to one end of the support tube, and the two tubes are internally connected. A mounting tube is hinged to the bracing tube. The body of the eddy current sensor is fixed inside the mounting tube. The wires of the eddy current sensor pass through the bracing tube and then through the support tube. The rotating joint is connected between the mounting tube and the support tube and is used to adjust the angle of the mounting tube. During use, both the support tube and the bracing tube are fixed to the machine base. A flexible hose is used to connect the rotating shaft of the rotating joint and the connection between the support tube and the bracing tube.

2. The method for real-time online detection and control of the intelligent chipper turret according to claim 1, characterized in that: The selected eddy current sensor meets the requirements of a measurement range of 0~20mm, an accuracy of 1~5 micrometers, and an accuracy that does not change between 0~120 degrees Celsius.

3. The method for real-time online detection and control of the intelligent chipper holder according to claim 2, characterized in that: The end of the eddy current sensor is equipped with an alkali-resistant protective cover.

4. The method for real-time online detection and control of the intelligent chipper turret according to claim 3, characterized in that: The scraper is equipped with a power mechanism for adjusting the scraper. The power mechanism includes a servo motor, a planetary reducer, and an adjusting rod. The output shaft of the servo motor is equipped with the planetary reducer, and the adjusting rod is installed in the output hole of the planetary reducer. The servo motor drives the adjusting rod forward and backward by rotating in both directions. The scraper is installed at the end of the adjusting rod. The forward and backward movement of the adjusting rod causes the scraper to move closer to or away from the drum.

5. The method for real-time online detection and control of the intelligent chipper turret according to claim 4, characterized in that: The scraper is equipped with a spring-loaded disc spring, which is installed between the adjusting rod and the scraper to quickly move the scraper away from the rotating drum. The disc spring is pre-loaded with a restoring force.

6. The method for real-time online detection and control of the intelligent chipper turret according to claim 5, characterized in that: The distance between the scraper and the eddy current sensor along the drum arc length is 100~200mm.

7. The method for real-time online detection and control of the intelligent chipper holder according to claim 6, characterized in that: Multiple scrapers are axially arranged on the outer wall of the drum. The scrapers are staggered and partially overlapped and arranged side by side. Each scraper is matched with an eddy current sensor. The multiple eddy current sensors are all connected to the input terminal of a controller. The servo motors on the multiple scrapers are all connected to the output terminal of a controller. Each scraper and its matched eddy current sensor form a group. Each group of scrapers and eddy current sensors is controlled independently.

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