Non-contact type furnace roller radial deformation amount on-line detection device

Abstract

The application discloses a kind of non-contact furnace roller radial deformation amount on-line detection device, it is related to sensor technical field, including central control system, communication module, data processing module, display and alarm module, data acquisition module and several pairs of displacement sensors, including machine case and frame, the machine case is installed on frame by four electric push rods, several pairs of the displacement sensor is installed in machine case, all displacement sensors are connected with data acquisition module circuit, the data acquisition module and display and alarm module are respectively connected with data processing module circuit, the data processing module is connected central control system by communication module, the heat dissipation component is provided in the machine case, four groups of damping components are provided on the frame, communication module transmits detection data to central control system, realizes remote monitoring and data storage, central control system can analyze historical data, optimize production process.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, specifically to a non-contact online detection device for radial deformation of furnace rollers. Background Technology

[0002] In the production process of stainless steel annealing furnaces, furnace rollers, as key components, are subjected to high-temperature and high-load working environments for extended periods, making them prone to thermal or mechanical deformation. Deformation of the furnace rollers can lead to problems such as strip misalignment and surface scratches, severely impacting product quality and production efficiency. Currently, furnace roller deformation detection mainly relies on offline detection methods, i.e., manual measurement or disassembly inspection of the furnace rollers after shutdown. However, this method cannot monitor in real time and cannot detect furnace roller deformation in a timely manner during production, leading to the accumulation of problems. Shutdown inspection increases production time costs, manual measurement has low accuracy, and is affected by the operator's skill level. Summary of the Invention

[0003] The purpose of this invention is to provide a non-contact online detection device for radial deformation of furnace rolls to solve the problems mentioned in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a non-contact online detection device for radial deformation of furnace rolls, comprising a central control system, a communication module, a data processing module, a display and alarm module, a data acquisition module, and several pairs of displacement sensors, including a chassis and a frame. The chassis is mounted on the frame via four electric push rods. Several pairs of displacement sensors are installed in the chassis. All displacement sensors are electrically connected to the data acquisition module. The data acquisition module and the display and alarm module are respectively electrically connected to the data processing module. The data processing module is connected to the central control system via the communication module. A heat dissipation component is provided inside the chassis. Four sets of shock absorption components are provided on the frame. The communication module transmits the detection data to the central control system, realizing remote monitoring and data storage. The central control system can analyze historical data and optimize the production process.

[0005] Furthermore, the front end of the frame is provided with a front cover plate, the rear end of the frame is provided with a rear drive assembly, and a pair of half tooth plates are rotatably installed at the bottom of the frame near the front cover plate. Servo motors are provided at the bottom of the pair of half tooth plates and in the rear drive assembly. The four sets of shock absorption assemblies are respectively installed on the four servo motors.

[0006] Furthermore, a drive motor is installed in the frame, and a main gear is mounted on the motor shaft of the drive motor. The main gear is located at the bottom of the frame, and a driven gear is rotatably mounted at the bottom of the frame. The driven gear meshes with the main gear and also meshes with two half-tooth plates. A pair of half-tooth plates are symmetrically installed. The detection device moves along the bottom of the furnace roll arrangement direction to facilitate the detection of the deformation of the furnace rolls used for steel feeding. The control system uses the drive motor to drive the main gear to rotate, the main gear drives the driven gear to rotate, and the driven gear drives the two half-tooth plates to rotate. The two half-tooth plates rotate in the same direction, so the drive motor can be used to control the direction of the detection device.

[0007] Furthermore, each set of the shock-absorbing components includes a hub connected to the motor shaft of a servo motor. Several inner magnets are evenly distributed in a ring within the hub. The inner magnets have their N pole on the side closer to the frame and their S pole on the side farther from the frame. Shock-absorbing rubber pads are provided on both sides of the hub. Four servo motors drive four hubs to rotate. The hubs and shock-absorbing wheel sleeves are connected by shock-absorbing rubber pads for shock absorption. At the same time, the inner magnets attract the magnetic blocks. When the hubs rotate, the magnetic force drives the shock-absorbing wheel sleeves to rotate, thereby driving the entire detection device to move.

[0008] Furthermore, a shock-absorbing wheel sleeve is provided on the outer side of the wheel hub. The shock-absorbing wheel sleeve is connected to the damping rubber pad. There is a gap between the inner wall of the shock-absorbing wheel sleeve and the wheel hub and the motor shaft of the servo motor. Magnetic blocks are evenly distributed in a ring on both sides of the shock-absorbing wheel sleeve. The number of magnetic blocks on each side is the same as the number of inner magnets. The magnetic blocks on each side attract each other with the inner magnets. Through magnetic connection and shock absorption by the damping rubber pad, the rigid connection between the wheel and the frame under normal circumstances is transformed into a flexible connection, increasing the stability of the frame during movement, thereby increasing the stability of the chassis and improving the accuracy of furnace roller displacement detection.

[0009] Furthermore, the internal structure of the chassis is equipped with three partitions, which divide the interior into a lower heat dissipation chamber, a front heat dissipation chamber, and a rear heat dissipation chamber. The front and rear heat dissipation chambers are symmetrically arranged, and each pair of displacement sensors is symmetrically arranged in the front and rear heat dissipation chambers. Each displacement sensor is tilted at 45°, and a thermoelectric cooler is installed at the bottom of each displacement sensor. The thermoelectric cooler extends from either the front or rear heat dissipation chamber into the lower heat dissipation chamber, with its heating end located in the lower heat dissipation chamber. Filter plates are installed on both sides of the chassis. During testing, an electric actuator lifts the chassis upwards until it is close to the furnace roll to be tested. The furnace roll has a high temperature during steel feeding. The displacement sensor uses high-temperature resistant materials to adapt to the high-temperature environment around the furnace roller. At the same time, the semiconductor cooling chip is energized to cool the front and rear heat dissipation chambers, protecting the displacement sensor from damage due to high temperature. The displacement sensor detects the radial runout data of the furnace roller in real time to obtain the deformation data of the furnace roller. The data acquisition module filters and amplifies the sensor signal to eliminate noise interference. The data processing module calculates the deformation of the furnace roller through an algorithm and compares it with a preset deformation threshold. When the deformation exceeds the set threshold, the display and alarm module will issue an audible and visual alarm signal. The detection results are displayed on the operation interface in real time for the operator's reference.

[0010] Furthermore, a skylight is provided on the top of the chassis corresponding to the position of each displacement sensor, and a low-pass glass is provided in the skylight. The heat dissipation assembly includes several heat dissipation plates and several ion wind generators. The heat dissipation plates are all located in the lower heat dissipation cavity, and each heat dissipation plate is in contact with two symmetrically arranged semiconductor cooling chips.

[0011] Furthermore, several ion wind generators are symmetrically installed in the front and rear heat dissipation chambers. Each ion wind generator includes a positive electrode ring and a negative electrode ring. The positive electrode ring has a serrated edge facing the negative electrode ring. The serrations of the several positive electrode rings in the front heat dissipation chamber face the same direction. When the positive electrode ring is connected to the positive terminal of the power supply and the negative electrode ring is connected to the negative terminal, an electric field is formed between the positive and negative electrode rings. The air around the positive electrode ring is ionized and quickly attracted by the negative electrode ring. The ionized air is propelled from the positive electrode ring to the negative electrode ring through collision and friction. When the air inside the chassis flows, it can conduct air from the upper surface of the chassis... Heat is dissipated through the filter plate, which effectively prevents external dust from entering the chassis. Air flows in from one end of the chassis and out from the other. Some of the flowing air passes through the lower heat dissipation chamber, where a heat sink conducts heat from the heating end of the semiconductor cooling chip. The air flowing in the lower heat dissipation chamber also dissipates heat from the heat sink. By setting up the heat dissipation components, the displacement sensor inside the chassis is ensured to operate at a suitable temperature to avoid damage from high temperatures. The ion wind component has no moving parts during the heat dissipation process. Compared with traditional fan cooling, it can avoid chassis vibration and further improve the detection accuracy of the equipment.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The magnetic connection and shock-absorbing rubber pads transform the rigid connection between the wheels and the frame into a flexible connection, increasing the stability of the frame during movement and thus improving the stability of the chassis and the accuracy of furnace roller displacement detection. The semiconductor cooling chip is energized to cool the front and rear heat dissipation chambers, protecting the displacement sensor from damage due to high temperatures. The ion wind assembly has no moving parts during heat dissipation, which, compared with traditional fan cooling, avoids chassis vibration and further improves the detection accuracy of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the external structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of the chassis of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the internal structure of the chassis of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the internal structure of the chassis of the present invention. Figure 3 ; Figure 6 This is a schematic diagram of the bottom structure of the frame of the present invention; Figure 7This is a schematic diagram of the structure of the shock absorption component of the present invention.

[0014] In the diagram: 1. Furnace roller; 2. Chassis; 3. Frame; 4. Electric actuator; 5. Low-pass glass; 6. Semiconductor cooling chip; 7. Displacement sensor; 8. Positive electrode ring; 9. Negative electrode ring; 10. Heat sink; 11. Rear drive assembly; 12. Front cover; 13. Main gear; 14. Driven gear; 15. Half gear plate; 16. Servo motor; 17. Wheel hub; 18. Internal magnet; 19. Shock-absorbing rubber pad; 20. Shock-absorbing wheel sleeve; 21. Magnetic block; 22. Filter plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example: Figures 1-7 As shown, this invention provides a technical solution: a non-contact online detection device for radial deformation of furnace rolls, comprising a central control system, a communication module, a data processing module, a display and alarm module, a data acquisition module, and several pairs of displacement sensors 7. The device includes a chassis 2 and a frame 3. The chassis 2 is mounted on the frame 3 via four electric push rods 4. Several pairs of displacement sensors 7 are installed inside the chassis 2. All displacement sensors 7 are electrically connected to the data acquisition module. The data acquisition module and the display and alarm module are respectively electrically connected to the data processing module. The data processing module is connected to the central control system via the communication module. A heat dissipation component is installed inside the chassis 2, and four sets of shock-absorbing components are installed on the frame 3. The communication module transmits the detection data to the central control system, enabling remote monitoring and data storage. The central control system can analyze historical data to optimize the production process.

[0017] The front end of the frame 3 is equipped with a front cover 12, and the rear end of the frame 3 is equipped with a rear drive assembly 11. A pair of semi-tooth plates 15 are rotatably mounted on the bottom of the frame 3 near the front cover 12. Servo motors 16 are mounted on the bottom of both the pair of semi-tooth plates 15 and in the rear drive assembly 11. Four sets of shock absorbers are mounted on the four servo motors 16. A drive motor (not shown in the figure) is installed in the frame 3. A main gear 13 is mounted on the motor shaft of the drive motor. The main gear 13 is located at the bottom of the frame 3. A driven component is also rotatably mounted at the bottom of the frame 3. Gear 14, driven gear 14 meshes with main gear 13, driven gear 14 also meshes with two half-tooth plates 15, a pair of half-tooth plates 15 are installed symmetrically, detection device moves along the bottom of the furnace roll 1 arrangement direction to facilitate detection of the deformation of the furnace roll 1 for steel feeding, control system uses drive motor to drive main gear 13 to rotate, main gear 13 drives driven gear 14 to rotate, driven gear 14 drives two half-tooth plates 15 to rotate, the two half-tooth plates 15 rotate in the same direction, so the drive motor can be used to control the direction of the detection device.

[0018] Each shock-absorbing assembly includes a hub 17, which is connected to the motor shaft of the servo motor 16. Several inner magnets 18 are evenly distributed in a ring within the hub 17. The inner magnets 18 with the N pole on the side closer to the frame 3 and the S pole on the side farther from the frame 3 are also included. Shock-absorbing rubber pads 19 are provided on both sides of the hub 17. A shock-absorbing wheel sleeve 20 is wrapped around the outside of the hub 17 and connected to the shock-absorbing rubber pads 19. There is a gap between the inner wall of the shock-absorbing wheel sleeve 20 and the hub 17 and the motor shaft of the servo motor 16. Magnetic blocks 21 are evenly distributed in a ring on both sides of the shock-absorbing wheel sleeve 20, with the number of magnetic blocks 21 on each side equal to the number of inner magnets 18. The number of 8 is the same. Each magnetic block 21 on each side attracts the inner magnet 18. Four servo motors 16 drive four wheel hubs 17 to rotate. The wheel hubs 17 and the shock-absorbing wheel sleeves 20 are connected by shock-absorbing rubber pads 19 for shock absorption. At the same time, the inner magnet 18 attracts the magnetic blocks 21. When the wheel hubs 17 rotate, the shock-absorbing wheel sleeves 20 are driven to rotate by magnetic force, thereby driving the entire detection device to move. Through magnetic connection and shock absorption by shock-absorbing rubber pads 19, the rigid connection between the wheel and the frame 3 under normal circumstances is transformed into a flexible connection, which increases the stability of the frame 3 during movement, thereby increasing the stability of the chassis 2 and improving the accuracy of displacement detection of the furnace roller 1.

[0019] The chassis 2 has three partitions that divide it into a lower heat dissipation chamber, a front heat dissipation chamber, and a rear heat dissipation chamber. The front and rear heat dissipation chambers are symmetrically arranged, and each pair of displacement sensors 7 is symmetrically arranged in the front and rear heat dissipation chambers. Each displacement sensor 7 is tilted at 45°, and a thermoelectric cooler 6 is installed at the bottom of each displacement sensor 7. The thermoelectric cooler 6 extends from the front or rear heat dissipation chamber into the lower heat dissipation chamber, with its heating end located in the lower heat dissipation chamber. Filter plates 22 are installed on both sides of the chassis 2. During testing, the electric push rod 4 lifts the chassis 2 upwards until it is close to the furnace roller 1 to be tested. The furnace roller 1, which is in the process of steel feeding, has a high temperature, and the displacement... Sensor 7 is made of high-temperature resistant material to adapt to the high-temperature environment around furnace roller 1. At the same time, the semiconductor cooling chip 6 is energized to cool the furnace roller, reducing the temperature in the front and rear heat dissipation chambers and protecting the displacement sensor 7 from damage due to high temperature. The displacement sensor 7 detects the radial runout data of furnace roller 1 in real time to obtain the deformation data of furnace roller 1. The data acquisition module filters and amplifies the sensor signal to eliminate noise interference. The data processing module calculates the deformation of furnace roller 1 through an algorithm and compares it with a preset deformation threshold. When the deformation exceeds the set threshold, the display and alarm module will issue an audible and visual alarm signal. The detection results are displayed on the operation interface in real time for the operator's reference.

[0020] A skylight is provided on the top of the chassis 2 corresponding to the position of each displacement sensor 7. A low-pass glass 5 is installed in the skylight. The heat dissipation assembly includes several heat sinks 10 and several ionizers. The heat sinks 10 are all located in the lower heat dissipation cavity, and each heat sink 10 is in contact with two symmetrically arranged semiconductor cooling chips 6. The ionizers are symmetrically installed in the front and rear heat dissipation cavities. Each ionizer includes a positive electrode ring 8 and a negative electrode ring 9. The side of the positive electrode ring 8 facing the negative electrode ring 9 is serrated. The serrations of the several positive electrode rings 8 in the front heat dissipation cavity face the same direction. When the positive electrode ring 8 is connected to the positive terminal of the power supply and the negative electrode ring 9 is connected to the negative terminal, an electric field is formed between the positive electrode ring 8 and the negative electrode ring 9. The air around the positive electrode ring 8 is ionized and quickly attracted by the negative electrode ring 9. Air is propelled from the positive electrode ring 8 to the negative electrode ring 9 through collision and friction. When the air inside the chassis 2 flows, it can dissipate the heat conducted from the upper surface of the chassis 2. The filter plate 22 effectively blocks external dust from entering the chassis 2. Air flows in from one end of the chassis 2 and out from the other end. Some of the flowing air will pass through the lower heat dissipation cavity. The heat dissipation plate 10 in the lower heat dissipation cavity conducts heat from the heating end of the semiconductor cooling chip 6. The air flowing in the lower heat dissipation cavity dissipates heat from the heat dissipation plate 10. By setting up the heat dissipation component, it is ensured that the displacement sensor 7 inside the chassis 2 operates at a suitable temperature to avoid damage from high temperature. The ion wind component has no moving parts during the heat dissipation process. Compared with traditional fan cooling, it can avoid vibration of the chassis 2 and further improve the detection accuracy of the equipment.

[0021] The working principle of this invention is as follows: The communication module transmits the detection data to the central control system to realize remote monitoring and data storage. The central control system can analyze historical data and optimize the production process. The detection device moves along the bottom of the furnace roll 1 in the arrangement direction to facilitate the detection of the deformation of the furnace roll 1 used for steel feeding. The control system uses a drive motor to drive the main gear 13 to rotate, the main gear 13 drives the driven gear 14 to rotate, and the driven gear 14 drives the two half-tooth plates 15 to rotate. The two half-tooth plates 15 rotate in the same direction, so the drive motor can be used to control the direction of the detection device.

[0022] Four servo motors 16 drive four wheel hubs 17 to rotate. The wheel hubs 17 and the shock-absorbing wheel sleeves 20 are connected by shock-absorbing rubber pads 19 for shock absorption. At the same time, the inner magnet 18 attracts the magnetic block 21. When the wheel hubs 17 rotate, the shock-absorbing wheel sleeves 20 are driven to rotate by magnetic force, thereby driving the entire detection device to move. Through magnetic connection and shock absorption by the shock-absorbing rubber pads 19, the rigid connection between the wheels and the frame 3 under normal circumstances is transformed into a flexible connection, which increases the stability of the frame 3 during movement, thereby increasing the stability of the chassis 2 and improving the accuracy of displacement detection of the furnace roller 1.

[0023] During testing, the electric actuator 4 lifts the housing 2 upwards until it is close to the furnace roll 1 to be tested. The furnace roll 1, which is in the process of feeding steel, has a high temperature. The displacement sensor 7 is made of high-temperature resistant material to adapt to the high-temperature environment around the furnace roll 1. At the same time, the semiconductor cooling chip 6 is energized to cool the furnace roll, which lowers the temperature in the front and rear heat dissipation chambers and protects the displacement sensor 7 from damage due to high temperature. The displacement sensor 7 detects the radial runout data of the furnace roll 1 in real time to obtain the deformation data of the furnace roll 1. The data acquisition module filters and amplifies the sensor signal to eliminate noise interference. The data processing module calculates the deformation of the furnace roll 1 through an algorithm and compares it with the preset deformation threshold. When the deformation exceeds the set threshold, the display and alarm module will issue an audible and visual alarm signal. The detection results are displayed on the operation interface in real time for the operator's reference.

[0024] When the positive ring 8 is connected to the positive terminal of the power supply and the negative ring 9 is connected to the negative terminal, an electric field is formed between the positive ring 8 and the negative ring 9. The air around the positive ring 8 is ionized and quickly attracted by the negative ring 9. The ionized air is pushed from the positive ring 8 to the negative ring 9 through collision and friction. When the air inside the chassis 2 flows, it can dissipate the heat conducted from the upper surface of the chassis 2. The filter plate 22 effectively blocks external dust from entering the chassis 2. Air flows in from one end of the chassis 2 and flows out from the other end. Some of the flowing air will pass through the lower heat dissipation cavity. The heat dissipation plate 10 in the lower heat dissipation cavity conducts heat from the heating end of the semiconductor cooling chip 6. The air flowing in the lower heat dissipation cavity dissipates heat from the heat dissipation plate 10. By setting up the heat dissipation component, it is ensured that the displacement sensor 7 inside the chassis 2 works at a suitable temperature to avoid damage from high temperature. The ion wind component has no moving parts during the heat dissipation process. Compared with traditional fan cooling, it can avoid vibration of the chassis 2 and further improve the detection accuracy of the equipment.

[0025] 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 non-contact online detection device for radial deformation of furnace rolls, comprising a central control system, a communication module, a data processing module, a display and alarm module, a data acquisition module, and several pairs of displacement sensors (7), characterized in that: The system includes a chassis (2) and a frame (3). The chassis (2) is mounted on the frame (3) via four electric push rods (4). Several pairs of displacement sensors (7) are installed in the chassis (2). All displacement sensors (7) are connected to the data acquisition module circuit. The data acquisition module and the display and alarm module are respectively connected to the data processing module circuit. The data processing module is connected to the central control system via the communication module. The chassis (2) is equipped with a heat dissipation component. The frame (3) is equipped with four sets of shock absorption components. The front end of the frame (3) is provided with a front cover plate (12), the rear end of the frame (3) is provided with a rear drive assembly (11), and a pair of half tooth plates (15) are rotatably installed at the bottom of the frame (3) near the front cover plate (12). Servo motors (16) are provided at the bottom of the pair of half tooth plates (15) and in the rear drive assembly (11). The four sets of shock absorption assemblies are respectively installed on the four servo motors (16). Each shock-absorbing assembly includes a hub (17), which is connected to the motor shaft of a servo motor (16). Several inner magnets (18) are evenly distributed in a ring in the hub (17). The inner magnets (18) have N poles on the side closer to the frame (3) and S poles on the side away from the frame (3). Shock-absorbing rubber pads (19) are provided on both sides of the hub (17). The outer side of the hub (17) is covered with a shock-absorbing wheel sleeve (20), which is connected to the shock-absorbing rubber pad (19). There is a gap between the inner wall of the shock-absorbing wheel sleeve (20) and the hub (17) and the motor shaft of the servo motor (16). Both sides of the shock-absorbing wheel sleeve (20) are evenly distributed with magnetic blocks (21) in a ring shape. The number of magnetic blocks (21) on each side is the same as the number of inner magnets (18). The magnetic blocks (21) on each side attract each other with the inner magnets (18).

2. The non-contact online detection device for radial deformation of furnace rolls according to claim 1, characterized in that: A drive motor is installed in the frame (3), and a main gear (13) is installed on the motor shaft of the drive motor. The main gear (13) is located at the bottom of the frame (3). A driven gear (14) is also rotatably installed at the bottom of the frame (3). The driven gear (14) meshes with the main gear (13) and also meshes with two half-tooth plates (15). A pair of half-tooth plates (15) are symmetrically installed.

3. The non-contact online detection device for radial deformation of furnace rolls according to claim 1, characterized in that: The chassis (2) is provided with three partitions inside, which divide the interior of the chassis (2) into a lower heat dissipation cavity, a front heat dissipation cavity and a rear heat dissipation cavity. The front heat dissipation cavity and the rear heat dissipation cavity are symmetrically arranged. Each pair of displacement sensors (7) is symmetrically arranged in the front heat dissipation cavity and the rear heat dissipation cavity. Each displacement sensor (7) is tilted at 45°. A semiconductor cooling chip (6) is installed at the bottom of each displacement sensor (7). The semiconductor cooling chip (6) extends from the front heat dissipation cavity or the rear heat dissipation cavity into the lower heat dissipation cavity. The heating end of the semiconductor cooling chip (6) is located in the lower heat dissipation cavity. Filter plates (22) are provided on both sides of the chassis (2).

4. The non-contact online detection device for radial deformation of furnace rolls according to claim 3, characterized in that: A skylight is provided above the chassis (2) at the position of each displacement sensor (7), and a low-pass glass (5) is provided in the skylight. The heat dissipation assembly includes several heat dissipation plates (10) and several ion wind generators. Several heat dissipation plates (10) are located in the lower heat dissipation cavity, and each heat dissipation plate (10) is in contact with two symmetrically arranged semiconductor cooling chips (6).

5. The non-contact online detection device for radial deformation of furnace rolls according to claim 4, characterized in that: Several of the ion wind generators are symmetrically installed in the front heat dissipation cavity and the rear heat dissipation cavity. Each ion wind generator includes a positive electrode ring (8) and a negative electrode ring (9). The positive electrode ring (8) is serrated on the side facing the negative electrode ring (9). The serrations of the several positive electrode rings (8) in the front heat dissipation cavity are oriented in the same direction.

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