Dustproof device and method based on synergy of dust-closing air curtain and personalized air supply

Abstract

The application discloses a kind of dustproof device and method of closed air curtain dust separation and individualized air supply synergistic effect, including basic air supply device and efficiency optimization device;The basic air supply device includes axial flow fan, air supply pipeline, telescopic air cylinder, fixed iron stand;The efficiency optimization device bag dust concentration detector, signal processing digital display, air cylinder telescopic mechanism and air cylinder outlet area adjusting plate;The efficiency optimization method is that the closed air curtain dust separation and individualized air supply synergistic effect dustproof device based on numerical model solution is established in any environmental dust concentration Different device structure parameter combination corresponding filtering efficiency formula is built into signal processing digital display, repeatedly read, counter-calculation and control adjust closed air curtain thickness, individualized air supply area radius, air cylinder telescopic length, reach optimal filtering efficiency, realize best dustproof effect, worker carries out efficient and accurate protection;Simple structure, high protection efficiency, easy operation, strong universality, higher application value.

Description

Technical Field

[0001] This invention belongs to the field of respiratory protection technology, and particularly relates to a dust prevention device and method that combines closed-loop air curtain dust isolation with personalized air supply for synergistic effect. Background Technology

[0002] With the acceleration of modern industrialization, dust is ubiquitous in large-scale, mechanized production across various industries. Dust control is a frequent and crucial task, and air curtains are a commonly used dust suppression device. However, a common problem encountered when using air curtains for dust suppression is their low efficiency. This is because the turbulent flow field within the air curtain can cause dust to be re-entrained and drawn back into the protected area. Summary of the Invention

[0003] To address the low dust suppression efficiency of air curtains, this invention proposes a dust prevention device and method that combines closed-loop air curtain dust isolation with personalized air supply for synergistic enhancement. First, the basic air supply device and efficiency optimization device are connected and installed within the protected area. Next, the filtration efficiency formula for the closed-loop air curtain dust isolation and personalized air supply synergistic enhancement dust prevention device, established based on numerical model calculations, corresponding to different combinations of device structural parameters under any environmental dust concentration, is embedded in the signal processing digital display. This allows for repeated reading, back-calculation, and control adjustment of the closed-loop air curtain thickness, the radius of the personalized air supply zone, and the extension / retraction length of the air duct until the optimal filtration efficiency is achieved, thus realizing the best dust prevention effect of the closed-loop air curtain dust isolation and personalized air supply synergistic enhancement dust prevention device. Ultimately, the goal of dust suppression through the synergistic enhancement of closed-loop air curtain and personalized air supply is achieved.

[0004] The specific technical solution is as follows:

[0005] A dust prevention device that combines closed-loop air curtain dust isolation with personalized air supply for synergistic effect, characterized in that it includes a basic air supply device and an efficiency optimization device;

[0006] The basic air supply device includes an axial flow fan 1, an air supply pipe 4, a telescopic air duct 5, and a fixed iron frame 7; the axial flow fan 1, the air supply pipe 4, and the telescopic air duct 5 are connected in series in a sealed manner; the fixed iron frame 7 is welded to the inner wall of the telescopic air duct 5.

[0007] The efficiency optimization device includes a dust concentration detector 2, a signal processing digital display 3, a duct telescopic mechanism 6, and a duct outlet area adjustment plate 8. The duct telescopic mechanism 6 is installed on the telescopic duct 5 to control the length of the telescopic duct 5. The duct outlet area adjustment plate 8 is located at the outlet end of the telescopic duct 5. The signal processing digital display 3 has a built-in control module and a control module. The control module is electrically connected to the dust concentration detector 2 and multiple ultrasonic distance sensors installed on the duct outlet area adjustment plate 8 to collect data. The drive module is electrically connected to the duct telescopic mechanism 6 and the duct outlet area adjustment plate 8 to regulate the device.

[0008] Preferably, the air duct outlet area adjustment plate 8 includes, from top to bottom, an upper cover plate 8-2, two sets of rotating blades 8-4, a gear plate 8-7, two drive gears 8-8, two micro motors 8-9, and a lower cover plate 8-10. The upper cover plate 8-2 is welded to the fixed iron frame 7, and two sets of fixing holes 8-1 are evenly distributed along the inner and outer edges of the upper cover plate 8-2. Each of the two sets of rotating blades 8-4 is provided with a fixed rotating rod 8-5, which is inserted into the fixing hole 8-1. The driven teeth of the gear plate 8-7 are distributed along the inner and outer edges, and the two drive gears 8-8 mesh with the inner and outer driven teeth of the gear plate 8-7 respectively. The rotation of the drive gears 8-8 is controlled by the micro motors 8-9.

[0009] Preferably, the ultrasonic distance sensor includes a first ultrasonic distance sensor 8-3, a second ultrasonic distance sensor 8-6, and a third ultrasonic distance sensor 8-11; the two sets of rotating blades 8-4 are an inner ring rotating blade and an outer ring rotating blade; the first ultrasonic distance sensor 8-3 is installed on the inner edge of the inner ring rotating blade and is used to monitor the radius of the personalized air outlet; the second ultrasonic distance sensor 8-6 is installed on the outer edge of the outer ring rotating blade and is used to monitor the distance between the rotating blade 8-4 and the inner wall of the telescopic air duct 5; the third ultrasonic distance sensor 8-11 is installed on the lower side of the lower cover plate 8-10 and is used to monitor the distance between the air duct outlet area adjustment plate 8 and the operator.

[0010] Preferably, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 convert the distance signal into a voltage signal and output it to the control module built into the signal processing digital display 3. The control module receives power from the power supply module, amplifies, filters, compares, and processes the distance signal, and outputs a control signal to the drive module according to the preset threshold and logical judgment. The drive module receives the control signal and drives the duct telescopic mechanism 6 and the duct outlet area adjustment plate 8 to realize the adjustment of the duct length, air curtain thickness, and personalized air supply zone radius.

[0011] A method for optimizing the efficiency of the aforementioned closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device is as follows: The filtration efficiency formula corresponding to different combinations of device structural parameters of the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device under any environmental dust concentration is built into the signal processing digital display 3, which reads the data from the dust concentration detector 2, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11, and back-calculates and adjusts the thickness of the closed-loop air curtain, the radius of the personalized air supply zone, and the extension length of the air duct, and controls the extension mechanism 6 of the air duct and the outlet area adjustment plate 8 of the air duct. The reading, back-calculation, and control are repeated until the optimal filtration efficiency is achieved.

[0012] Furthermore, it includes the following two main steps:

[0013] Step 1: Based on the COMSOL Multiphysics numerical model, establish the formula for optimizing the filtering efficiency:

[0014] S1: Set initial conditions for calculation: Set two values ​​for each of the following: ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct.

[0015] S2: Numerical model solution: First, the four variables, namely, ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct, are coupled in pairs to form 16 combinations, and the dust filtration efficiency of all combinations is measured in turn.

[0016] S3: Establish the filtration efficiency optimization formula: Based on the solution results of step S2, use Design-Expert12 to fit the functional relationship between filtration efficiency η and ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct, and determine the degree of influence of the variables.

[0017] S4: Implementation of built-in and autonomous optimization function of filtration efficiency formula: The filtration efficiency formula established in step S3 is built into the signal processing digital display 3. Data such as ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct are collected through electrical connection. The collected data is input into the filtration efficiency formula to obtain the initial filtration efficiency. If the filtration efficiency is lower than 99%, the signal processing digital display 3 adjusts the closed air curtain thickness w, the distance h between the measuring point position of the air duct and the bottom of the air duct, and the personalized air supply zone radius r in sequence according to the degree of influence. After adjustment, the data of the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 are substituted into the formula again. The operation is repeated until the ambient dust filtration efficiency reaches the optimal value.

[0018] Step 2, Filtration efficiency implementation process:

[0019] S1: The axial flow fan 1, the air supply duct 4, and the telescopic air duct 5 are sequentially sealed and connected in series. The fixed iron frame 7 is welded to the inner wall of the telescopic air duct 5. The air duct outlet area adjustment plate 8 is suspended and fixed at the outlet of the telescopic air duct 5 through the fixed iron frame 7.

[0020] S2: The signal processing digital display 3 is electrically connected to the dust concentration detector 2, the first ultrasonic distance sensor 9-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 respectively to collect data.

[0021] S3: The filtration efficiency optimization formula for the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device, which is established based on numerical model calculation, is built into the signal processing digital display 3. The data of the dust concentration detector 2, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 are collected. The air duct telescopic mechanism 6 and the air duct outlet area adjustment plate 8 are controlled to adjust the thickness w of the closed-loop air curtain, the radius r of the personalized air supply area, and the distance h between the air duct measuring point and the bottom of the air duct.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] (1) The closed air curtain and personalized air supply of the present invention work together to achieve both the dust isolation function of the closed air curtain and the clean airflow delivery in the breathing zone of dust-exposed workers.

[0024] (2) Based on numerical model calculation, this invention establishes the filtration efficiency formula corresponding to different combinations of device structural parameters of the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device under any environmental dust concentration. Adjust the thickness of the closed-loop air curtain, the radius of the personalized air supply area, and the extension length of the air duct until the optimal filtration efficiency is achieved, so as to realize the best dust prevention effect of the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device.

[0025] (3) The device of the present invention has a simple structure, high protection efficiency, convenient operation, strong versatility and high application value. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the closed air curtain dust isolation and personalized air supply synergy device of the present invention;

[0027] Figure 2 This is a detailed view of the interior of the air duct outlet area adjustment plate of the present invention;

[0028] Figure 3 This is a schematic diagram of the operational logic of the signal processing digital display of the present invention;

[0029] The components include: 1. Axial flow fan; 2. Dust concentration detector; 3. Signal processing digital display; 4. Air supply duct; 5. Telescopic air duct; 6. Air duct telescopic mechanism; 7. Fixed iron frame; 8. Air duct outlet area adjustment plate; 8-1. Fixing hole; 8-2. Upper cover plate; 8-3. First ultrasonic distance sensor; 8-4. Rotating blade; 8-5. Fixed rotating rod; 8-6. Second ultrasonic distance sensor; 8-7. Gear plate; 8-8. Drive gear; 8-9. Micro motor; 8-10. Lower cover plate; 8-11. Third ultrasonic distance sensor. Detailed Implementation

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] The following is in conjunction with the instruction manual appendix. Figure 1-3 This paper provides a detailed description of a dust prevention device and method that combines closed-loop air curtain dust isolation with personalized air supply for synergistic effect.

[0032] A dust prevention device that combines closed-loop air curtain dust isolation with personalized air supply for synergistic effect includes a basic air supply device and an efficiency optimization device.

[0033] The basic air supply device includes an axial flow fan 1, an air supply pipe 4, a telescopic air duct 5, and a fixed iron frame 7. The axial flow fan 1, the air supply pipe 4, and the telescopic air duct 5 are connected in series in a sealed manner. The telescopic air duct 5 is divided into a connected telescopic section and a fixed non-telescopic section. The air supply pipe 4 is connected to the telescopic section, and the fixed iron frame 7 is welded to the inner wall of the fixed non-telescopic section of the telescopic air duct 5.

[0034] The efficiency optimization device includes a dust concentration detector 2, a signal processing digital display 3, a duct telescopic mechanism 6, and a duct outlet area adjustment plate 8. The signal processing digital display 3 has a built-in control module and a drive module. The control module is electrically connected to the dust concentration detector 2 and multiple ultrasonic distance sensors to collect data. The drive module is electrically connected to the duct telescopic mechanism 6 and the duct outlet area adjustment plate 8 to regulate the device.

[0035] In one embodiment of the present invention, the telescopic mechanism 6 of the air duct includes an SBR guide rail slider, a folding telescopic joint, and a servo cylinder. The folding telescopic joint is installed on the telescopic section of the telescopic air duct 5 and is composed of a parallel four-bar linkage mechanism; the upper end of the SBR guide rail is welded to the inner wall of the first telescopic air duct section, and the lower end is welded to the inner wall of the last telescopic air duct section; the SBR slider slides along the telescopic direction of the telescopic air duct 5; the servo cylinder is connected to the slider and is electrically connected to the built-in drive device of the signal processing digital display 3, so that the servo cylinder receives the signal command from the drive device and drives the SBR slider to move along the guide rail to realize the adjustment of the telescopic length.

[0036] In one embodiment of the present invention, the air duct outlet area adjustment plate 8 is fixed from top to bottom by an upper cover plate 8-2, two sets of rotating blades 8-4, a gear plate 8-7, two drive gears 8-8, two micro motors 8-9, and a lower cover plate 8-10. The upper cover plate 8-2 is welded to a fixed iron frame 7, and the air duct outlet area adjustment plate 8 is suspended and fixed at the outlet of the telescopic air duct 5 by the fixed iron frame 7; two sets of fixing holes 8-1 are evenly distributed along the inner and outer edges of the upper cover plate 8-2, and the rotating blades 8-4 are provided with fixed rotating rods 8-5, which are inserted into the fixing holes 8-1 in sequence; the driven teeth of the gear plate 8-7 are distributed along its inner and outer edges, and the two drive gears 8-8 respectively mesh with the inner and outer driven teeth of the gear plate 8-7; the micro motors 8-9 are electrically connected to the built-in drive module of the signal processing digital display 3, thereby controlling the rotation of the drive gears 8-8 to achieve the adjustment of the air duct outlet area.

[0037] In one embodiment of the present invention, there are three ultrasonic distance sensors, including a first ultrasonic distance sensor 8-3, a second ultrasonic distance sensor 8-6, and a third ultrasonic distance sensor 8-11; the two sets of rotating blades 8-4 are inner and outer rotating blades, with the outer rotating blades located on the outer ring of the inner rotating blades; the first ultrasonic distance sensor 8-3 is installed on the inner edge of the inner rotating blades to monitor the radius of the personalized air supply hole; the second ultrasonic distance sensor 8-6 is installed on the outer edge of the outer rotating blades to monitor the distance between the rotating blades 8-4 and the inner wall of the telescopic air duct 5; under the control of the built-in logic statements of the signal processing digital display 3, the built-in control module starts the micro motor 8-9 and the built-in servo electric cylinder of the telescopic mechanism 6 to control the rotating blades 8-4 to rotate around the fixed rotating rod 8-5 and adjust the length of the telescopic mechanism 6, thereby realizing continuous adjustment and change of the radius of the personalized air supply area, the thickness of the air curtain, and the distance between the air duct outlet area adjustment plate 8 and the operator; the third ultrasonic distance sensor 8-11 is installed on the lower side of the lower cover plate 8-10 to monitor the distance between the air duct outlet area adjustment plate 8 and the operator.

[0038] In one embodiment of the present invention, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 convert distance signals into voltage signals and output them to the built-in control module and drive module of the signal processing digital display 3. The control module is connected to a power supply module and receives power from the power supply module. The control module amplifies, filters, compares, and processes the distance signals. Based on a preset threshold and logical judgment, it outputs a control signal to the built-in drive module of the signal processing digital display 3. The drive module receives the control signal and drives the wind tunnel telescopic mechanism 6 and the wind tunnel outlet area adjustment plate 8 to realize the adjustment of the wind tunnel length, the air curtain thickness (the air curtain thickness refers to the distance between the rotating blades 8-4 and the inner wall of the telescopic wind tunnel 5), and the radius of the personalized air supply area.

[0039] A method for optimizing the efficiency of the aforementioned closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device is as follows: The filtration efficiency formula corresponding to different combinations of device structural parameters of the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device under any environmental dust concentration is built into the signal processing digital display 3, which reads the data from the dust concentration detector 2, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11, and back-calculates and adjusts the thickness of the closed-loop air curtain, the radius of the personalized air supply zone, and the extension length of the air duct, and controls the extension mechanism 6 of the air duct and the outlet area adjustment plate 8 of the air duct. The reading, back-calculation, and control are repeated until the optimal filtration efficiency is achieved.

[0040] In one embodiment of the present invention, the efficiency optimization method specifically includes the following two main steps:

[0041] Step 1: Based on the COMSOL Multiphysics numerical model, establish the formula for optimizing the filtering efficiency:

[0042] S1: Set initial conditions for calculation: The ambient dust concentration c is set to 20 mg / m³. 3 60mg / m 3 The thickness w of the enclosed air curtain is 2cm and 8cm respectively, the radius r of the personalized air supply zone is 20cm and 40cm respectively, and the distance h between the measuring point of the air duct and the bottom of the air duct is 20cm and 80cm respectively.

[0043] S2: Numerical model solution: First, the four variables, namely, ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct, are coupled in pairs to form 16 combinations, and the dust filtration efficiency of all combinations is measured in turn.

[0044] S3: Establish the filtration efficiency optimization formula: Based on the solution results of step S2, use Design-Expert12 to fit the functional relationship between filtration efficiency η and ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and the distance h between the measuring point position and the bottom of the air duct, and determine the degree of influence of the variables. The functional relationship is as follows:

[0045] η=-1.392*c+2.000*w-0.414*h+0.1S3*r+0.067*c*w+0.00792*c*h+0.02*c*r+0.0056*w*h-0.13*w*r-0.0033*h*r

[0046] In the formula, η is the environmental dust filtration efficiency; c is the environmental dust concentration; w is the thickness of the enclosed air curtain; r is the radius of the personalized air supply zone; and h is the distance between the measuring point of the air duct and the bottom of the air duct.

[0047] S4: Implementation of built-in and autonomous optimization function of filtration efficiency formula: The filtration efficiency formula established in step S3 is built into the signal processing digital display 3. Data such as ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct are collected through electrical connection. The collected data is input into the filtration efficiency formula to obtain the initial filtration efficiency. If the filtration efficiency is lower than 99%, the signal processing digital display 3 adjusts the closed air curtain thickness w, the distance h between the measuring point position of the air duct and the bottom of the air duct, and the personalized air supply zone radius r in sequence according to the degree of influence. After adjustment, the data of the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 (i.e., personalized air supply zone radius r, closed air curtain thickness w, and distance h between the measuring point position of the air duct and the bottom of the air duct) are substituted into the formula again. The operation is repeated until the ambient dust filtration efficiency η reaches the optimal value.

[0048] Step 2, Filtration efficiency implementation process:

[0049] S1: The axial flow fan 1, the air supply duct 4, and the telescopic air duct 5 are sequentially sealed and connected in series. The fixed iron frame 7 is welded to the inner wall of the telescopic air duct 5. The air duct outlet area adjustment plate 8 is suspended and fixed at the outlet of the telescopic air duct 5 through the fixed iron frame 7.

[0050] S2: The signal processing digital display 3 is electrically connected to the dust concentration detector 2, the first ultrasonic distance sensor 9-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 respectively to collect data.

[0051] S3: The filtration efficiency optimization formula for the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device, which is established based on numerical model calculation, is built into the signal processing digital display 3. The data of the dust concentration detector 2, the first ultrasonic distance sensor 8-3, the second ultrasonic distance sensor 8-6, and the third ultrasonic distance sensor 8-11 are collected. The air duct telescopic mechanism 6 and the air duct outlet area adjustment plate 8 are controlled to adjust the thickness w of the closed-loop air curtain, the radius r of the personalized air supply area, and the distance h between the air duct measuring point and the bottom of the air duct.

[0052] This invention discloses a closed-loop air curtain dust control device and method that synergistically enhances dust prevention with personalized air supply. On the one hand, it achieves both dust control through the closed-loop air curtain and clean airflow delivery to the breathing zone of dust-exposed workers. On the other hand, based on the filtration efficiency formula corresponding to different combinations of device structural parameters under any environmental dust concentration, established by numerical modeling, the thickness of the closed-loop air curtain, the radius of the personalized air supply zone, and the extension length of the air duct can be adjusted to achieve the optimal filtration efficiency, thus realizing the best dust prevention effect of the closed-loop air curtain dust control and personalized air supply synergistic dust prevention device. This invention has a simple structure, is easy to operate, has strong universality, and high application value.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dust prevention device that combines closed-loop air curtain dust control with personalized air supply for synergistic effect, characterized in that, Includes basic air supply devices and efficiency optimization devices; The basic air supply device includes an axial flow fan (1), an air supply duct (4), a telescopic air duct (5), and a fixed iron frame (7); the axial flow fan (1), the air supply duct (4), and the telescopic air duct (5) are connected in series in a sealed manner; the fixed iron frame (7) is welded to the inner wall of the telescopic air duct (5); The efficiency optimization device includes a dust concentration detector (2), a signal processing digital display (3), a duct telescopic mechanism (6), and a duct outlet area adjustment plate (8); the duct telescopic mechanism (6) is installed on the telescopic duct (5) to control the length of the telescopic duct (5); the duct outlet area adjustment plate (8) is located at the outlet end of the telescopic duct (5). The signal processing digital display (3) has a built-in control module and a drive module. The control module is electrically connected to the dust concentration detector (2) and multiple ultrasonic distance sensors set on the air duct outlet area adjustment plate (8) to collect data. The drive module is electrically connected to the air duct telescopic mechanism (6) and the air duct outlet area adjustment plate (8) to regulate the device. The air duct outlet area adjustment plate (8) includes an upper cover plate (8-2), two sets of rotating blades (8-4), a gear plate (8-7), two drive gears (8-8), two micro motors (8-9), and a lower cover plate (8-10) fixed from top to bottom. The upper cover plate (8-2) is welded to the fixed iron frame (7). Two sets of fixing holes (8-1) are evenly distributed along the inner and outer edges of the upper cover plate (8-2). Each set of rotating blades (8-4) is provided with a fixed rotating rod (8-5), which is inserted into the fixing hole (8-1). The driven teeth of the gear plate (8-7) are distributed along the inner and outer edges. The two drive gears (8-8) mesh with the inner and outer driven teeth of the gear plate (8-7), and the drive gears (8-8) are controlled to rotate by the micro motors (8-9).

2. The dust prevention device that combines closed-loop air curtain dust control with personalized air supply for synergistic effect as described in claim 1, characterized in that, The ultrasonic distance sensor includes a first ultrasonic distance sensor (8-3), a second ultrasonic distance sensor (8-6), and a third ultrasonic distance sensor (8-11); the two sets of rotating blades (8-4) are an inner ring rotating blade and an outer ring rotating blade; the first ultrasonic distance sensor (8-3) is installed on the inner edge of the inner ring rotating blade and is used to monitor the radius of the personalized air supply hole; the second ultrasonic distance sensor (8-6) is installed on the outer edge of the outer ring rotating blade and is used to monitor the distance between the rotating blade (8-4) and the inner wall of the telescopic air duct (5); the third ultrasonic distance sensor (8-11) is installed on the lower side of the lower cover plate (8-10) and is used to monitor the distance between the air duct outlet area adjustment plate (8) and the operator.

3. The dust prevention device that combines closed-loop air curtain dust isolation with personalized air supply for synergistic effect as described in claim 2, is characterized in that... The first ultrasonic distance sensor (8-3), the second ultrasonic distance sensor (8-6), and the third ultrasonic distance sensor (8-11) convert the distance signal into a voltage signal and output it to the control module built into the signal processing digital display (3). The control module amplifies, filters, and compares the distance signal. Based on the preset threshold and logical judgment, it outputs a control signal to the drive module. The drive module receives the control signal and drives the wind tunnel telescopic mechanism (6) and the wind tunnel outlet area adjustment plate (8) to realize the adjustment of the wind tunnel length, air curtain thickness, and personalized air supply area radius.

4. A method for efficiency optimization using the closed-loop air curtain dust isolation and personalized air supply synergistic dust prevention device as described in claim 3, characterized in that, The formula for the filtration efficiency of the closed-loop air curtain dustproof and personalized air supply synergistic dust prevention device based on numerical model calculation is built into the signal processing digital display (3) for different combinations of device structural parameters under any environmental dust concentration. This allows the device to read data from the dust concentration detector (2), the first ultrasonic distance sensor (8-3), the second ultrasonic distance sensor (8-6), and the third ultrasonic distance sensor (8-11), and to back-calculate and adjust the thickness of the closed-loop air curtain, the radius of the personalized air supply area, and the extension length of the air duct. It also controls the extension mechanism of the air duct (6) and the air duct outlet area adjustment plate (8). The device is repeatedly read, back-calculated, and controlled until the optimal filtration efficiency is achieved.

5. The method according to claim 4, characterized in that, It includes the following two main steps: Step 1: Based on the COMSOL Multiphysics numerical model, establish the formula for optimizing the filtering efficiency: S1: Set initial conditions for calculation: Set two values ​​for each of the following: ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct. S2: Numerical model solution: First, the four variables, namely, ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct, are coupled in pairs to form 16 combinations, and the dust filtration efficiency of all combinations is measured in turn. S3: Establish the filtration efficiency optimization formula: Based on the solution results of step S2, use Design-Expert12 to fit the functional relationship between filtration efficiency η and ambient dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct, and determine the degree of influence of the variables. S4: Filtration efficiency formula built-in and self-optimization function: The filtration efficiency formula established in step S3 is built into the signal processing digital display (3). Data is collected through electrical connection, including environmental dust concentration c, closed air curtain thickness w, personalized air supply zone radius r, and distance h between the measuring point position of the air duct and the bottom of the air duct. The collected data is input into the filtration efficiency formula to obtain the initial filtration efficiency. If the filtration efficiency is lower than 99%, the signal processing digital display (3) adjusts the closed air curtain thickness w, the distance h between the measuring point position of the air duct and the bottom of the air duct, and the personalized air supply zone radius r in sequence according to the degree of influence. After adjustment, the data of the first ultrasonic distance sensor (8-3), the second ultrasonic distance sensor (8-6), and the third ultrasonic distance sensor (8-11) are substituted into the formula again. The operation is repeated until the environmental dust filtration efficiency reaches the optimal value. Step 2, Filtration efficiency implementation process: S1: Seal and connect the axial flow fan (1), air supply duct (4), and telescopic air duct (5) in sequence, and weld the fixed iron frame (7) to the inner wall of the telescopic air duct (5). Use the fixed iron frame (7) to suspend and fix the air duct outlet area adjustment plate (8) at the outlet of the telescopic air duct (5). S2: The signal processing digital display (3) is electrically connected to the dust concentration detector (2), the first ultrasonic distance sensor (8-3), the second ultrasonic distance sensor (8-6), and the third ultrasonic distance sensor (8-11) respectively to collect data; S3: The filtration efficiency optimization formula for the closed-loop air curtain dustproof and personalized air supply synergistic dust prevention device established based on numerical model calculation is built into the signal processing digital display (3) to match the structural parameters of different devices under any environmental dust concentration. The data of dust concentration detector (2), first ultrasonic distance sensor (8-3), second ultrasonic distance sensor (8-6), and third ultrasonic distance sensor (8-11) are collected to control the air duct telescopic mechanism (6) and the air duct outlet area adjustment plate (8), thereby adjusting the closed-loop air curtain thickness w, personalized air supply area radius r, and distance h between the air duct measuring point position and the bottom of the air duct.

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