A laser film thickness measuring device and method for a film production line

Abstract

The application discloses a kind of laser film thickness measuring device and method for film production line, by the detection turntable of coaxial arrangement is integrated double-ring air supply unit and sinking air collection unit, constructs axial dust removal component.The device utilizes the exhaust gas of waste heat generated by motor operation, is transported to double-ring air collection channel through air inlet passage, forms uniform, vertically downward low-speed diffusion air curtain at dust removal port by the air supply hole of opposite arrangement on inner and outer ring channel, realizes the soft cleaning of film surface.The windward disc of synchronous rotation below cooperates with air pump, effectively rolls and removes dust under the action of dynamic low pressure.The design integrates vertical cleaning and rotating scanning thickness measurement, not only solves the problem of incomplete cleaning and easy secondary pollution of traditional device, but also improves detection efficiency and accuracy through circumferential scanning, and the modular structure further supports low-cost production line expansion, and comprehensively optimizes the comprehensive performance of film online detection.

Description

Technical Field

[0001] This invention relates to a laser film thickness measurement device and method, and more particularly to a laser film thickness measurement device and method for use in a film production line. Background Technology

[0002] In the field of thin film manufacturing, online thickness measurement is a crucial step in ensuring product quality. Traditional laser thickness measurement technologies, which employ single-point static measurement, Z-track scanning, or multi-point fixed measurement, generally suffer from common technical challenges such as high cleanliness sensitivity, a trade-off between detection efficiency and accuracy, and high costs associated with expanding to multiple production lines.

[0003] To address the aforementioned issues, existing technologies, such as the inspection device and method for laser film production disclosed in CN120403461A, employ a synchronously rotating upper and lower inspection disc. This solution utilizes exhaust gas generated by a motor, which forms a purging airflow through an annular air path inside the cylindrical disc, achieving simultaneous online thickness measurement and integrated purging cleaning. This device effectively utilizes a rotating scanning structure to improve inspection efficiency and, through its self-cleaning function, alleviates the cleaning sensitivity issue to some extent, representing a significant technological advancement in this field.

[0004] However, in application, its cleaning function relies on the annular air path and circumferential airflow outlet set between the detection turntables. This lateral or inclined purging airflow field has limitations in terms of coverage uniformity and cleaning thoroughness. First, when the airflow reaches the film surface, its momentum and direction may change due to rotation, making it difficult to form a stable and uniform vertical force across the entire width of the film. For fine dust or fibers with strong adhesion, the blowing effect is limited. Second, this purging method mainly acts on the side of the film facing the airflow outlet, with weak cleaning ability on the leeward side or lower surface of the film. Furthermore, the blown-off impurities may only diffuse within the detection area and fail to be effectively and quickly collected and discharged, posing a risk of secondary pollution. In addition, there is still potential to be explored in terms of utilizing motor waste heat and improving system heat dissipation efficiency using this airflow path. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technologies, this invention provides a laser film thickness measurement device and method for film production lines.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a laser film thickness measuring device for a film production line, including a central shaft, on which two detection turntables are installed at intervals, and a detection area is formed in the vertical projection space between the two detection turntables; two sets of laser detection heads are axially aligned on the end faces of the two detection turntables, each set of laser detection heads is aligned to detect one film, and covers the full width of each film with the rotation radius of the detection turntable; the lead wires of the laser detection heads pass through the wiring channel, and the lead wires are connected one-to-one to the annular contact end located on the outer periphery of the central shaft;

[0007] It also includes an intermediate component and a motor; the intermediate component has an outer sleeve, in which a bearing assembly rotatably supports the lower part of the central shaft is installed in the bearing housing hole of the outer sleeve, and a cavity is opened below the bearing assembly inside the outer sleeve, in which an electrical lead end is installed, the electrical lead end is located beside the annular contact end, and is connected to the annular contact end through an elastic tab; the motor is fixedly connected to the outer sleeve through an upper end cover, and the outer sleeve has an air intake passage that connects to the exhaust port of the motor;

[0008] It also includes an axial dust removal assembly, which has two sets of double-ring air supply units and a sunken air collection unit that are coaxially attached to the end faces of the detection turntable. The interval between the double-ring air supply units and the sunken air collection units is located within the detection area. The double-ring air supply units form a ring-shaped dust removal port facing downwards on the upper end face of the detection turntable through the nested double-ring air collection channels. The double-ring air collection channels are connected to the air intake passage. The sunken air collection unit is set facing the dust removal port through a wind-facing plate with an outer diameter larger than the dust removal port. The wind-facing plate is embedded in the lower end face of the detection turntable and has a sunken air outlet that axially penetrates the detection turntable.

[0009] Furthermore, the dual-ring air collection channel has an inner ring air channel and an outer ring air channel arranged concentrically. The dust removal port is formed between the inner ring air channel and the outer ring air channel. A ring of evenly spaced internal air delivery holes is opened at the root of the side of the inner ring air channel facing the dust removal port, and a ring of evenly spaced external air delivery holes is opened at the root of the side of the outer ring air channel facing the dust removal port.

[0010] Furthermore, the number of external air outlets is no less than the number of internal air outlets.

[0011] Furthermore, the bottom of both the inner and outer ring air passages near the central axis are connected to the intake passage sequentially through the branch ends and common ends of the bend assembly. The outer ring air passage is connected to more branch ends of the bend assembly than the inner ring air passage. The ring heights of the inner and outer ring air passages are consistent at the same point, and both gradually decrease in the direction away from the central axis.

[0012] Furthermore, the ratio of the width of the dust removal port to the height of the air duct is greater than 2.

[0013] Furthermore, an air pump is connected to the air outlet, and the air pump is located on the outside of the detection turntable.

[0014] Furthermore, the laser detection head leads pass through the reserved channel of the detection turntable and the reserved hole of the central rotating shaft in sequence into the wiring channel; multiple insulating rings are fixedly sleeved on the outer circumference of the central rotating shaft, and an independent annular conductive track is embedded on the outer surface of each insulating ring. The leads extend and connect to the contact point of the annular conductive track in the wiring channel; elastic tabs corresponding to the number of annular conductive tracks are led out from the lead end, and the elastic tabs are in contact with the annular conductive tracks, and wires are connected to the outer sleeve or to the outside of the motor at each lead end.

[0015] Furthermore, two electrical leads are provided inside the cavity, and the contact heads of the elastic tabs of the two electrical leads are centrally symmetrically connected to the annular conductive track.

[0016] Furthermore, the lower end of the outer sleeve is fixedly connected to the upper end cover of the motor via a flange; the upper end of the outer sleeve forms a dynamic seal with the lower edge of the adjacent detection turntable via a dynamic sealing ring.

[0017] A cleaning method for a laser film production inspection device, the cleaning method being a vertical cleaning method based on a laser film thickness measuring device used in a film production line, using the waste heat exhaust generated by the motor driving the rotating inspection turntable as the air source, and guiding it upward through the circumferentially distributed air intake passage inside the device.

[0018] The guided airflow enters the dual-ring air supply unit and is ejected through a large number of air supply holes set opposite to each other on its inner and outer ring air channels. The two airflows mix at the dust removal port, so that the initially uneven high-speed airflow is fully homogenized and finally forms a vertical air curtain.

[0019] The vertical air curtain rotates synchronously with the detection turntable, gently and completely covering the upper surface of the film, effectively blowing away light dust and fibers, and suppressing static electricity generation. Below the film, the windward plate of the sunken air collection unit, which rotates synchronously with the air supply unit, faces the air curtain above. The rotational motion naturally creates a dynamic low-pressure zone behind the windward plate, which, in conjunction with the suction force of the air pump, produces a suction effect, drawing away the dust adhering to the lower surface of the film, forming a dynamic turbulent cleaning effect.

[0020] This invention discloses a laser film thickness measurement device and method for film production lines. By setting up a double-ring air supply unit and a sinking air collection unit coaxially attached to the detection turntable, the device utilizes the exhaust heat of the motor to form a uniform, vertically acting low-speed diffusion air curtain on the upper and lower surfaces of the film. Combined with the dynamic low pressure generated by the rotation and the suction of the air pump, it achieves efficient and full-coverage cleaning of the film, effectively blowing away and collecting dust and suppressing static electricity. At the same time, its circumferential scanning laser thickness measurement structure avoids reciprocating motion. While improving detection efficiency and accuracy, the modular power supply and airflow design supports low-cost and convenient multi-production line expansion, completely solving the core problems of incomplete cleaning, efficiency and accuracy contradictions, and high production line expansion costs in traditional technologies. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 2 This is the front view of the axial dust removal assembly.

[0023] Figure 3 Schematic diagram of the three-dimensional structure of the axial dust removal component Figure 1 .

[0024] Figure 4 Schematic diagram of the three-dimensional structure of the axial dust removal component Figure 2 .

[0025] Figure 5 This is a schematic diagram of the dual-ring air supply unit.

[0026] In the diagram: 1. Central shaft; 2. Laser detection head; 3. Detection turntable; 4. Outer sleeve; 5. Dynamic sealing ring; 6. Bearing housing; 7. Bearing assembly; 8. Cavity; 9. Motor; 10. Upper end cover; 14. Detection area; 15. Air inlet passage; 16. Double-ring air supply unit; 17. Recessed air collection unit; 18. Lead wire; 19. Reserved channel; 20. Reserved hole; 21. Wiring channel; 22. Insulating ring; 23. Annular conductive track; 24. Power lead end; 25. Elastic lever; 26. Film; 27. Dust removal port; 28. Windproof plate; 29. ​​Air outlet; 30. Branch end; 31. Common end; 32. Air pump; 161. Inner ring air passage; 162. Outer ring air passage; 163. Internal air supply hole; 164. External air supply hole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 and Figure 2The illustrated laser film thickness measuring device for a film production line includes a hollow central shaft 1. Two detection turntables 3 are mounted at intervals on the central shaft 1, positioned above the central shaft 1. A detection area 14 is formed within the vertical projection space between the two detection turntables. Two sets of laser detection heads 2 are axially aligned on the adjacent end faces of the two detection turntables. Each set of laser detection heads detects one film, and its coverage extends to the full width of each film as the detection turntable rotates. The lead wires 18 of the laser detection heads 2 pass through a wiring channel. Lead wires 18 are connected one-to-one to the annular contact ends located on the outer periphery of the central shaft; the lead wires 18 of the laser detection head 2 pass through the reserved channel 19 of the detection turntable and the reserved hole 20 of the central shaft 1 and enter the wiring channel 21 in sequence; multiple insulating rings 22 are fixedly sleeved on the outer periphery of the central shaft 1, and each insulating ring is embedded with an independent annular conductive track 23 on its outer surface. The lead wires 18 extend downward to connect to the contact point of the annular conductive track in the wiring channel; two lead ends are provided in the cavity, and the contact heads of the elastic tabs of the two lead ends are centrally symmetrical and connected to the annular conductive track.

[0029] It also includes an intermediate component and a motor 9; the intermediate component has an outer sleeve 4, and a bearing assembly 7 rotatably supported on the lower part of the rotating shaft is installed in the bearing seat 6 hole of the outer sleeve 4. In this embodiment, a pair of diagonal contact ball bearings are used to ensure that the concentricity error of the rotating shaft 1 is ≤0.02mm; a cavity 8 is opened in the outer sleeve 4 below the bearing assembly, and an electrical lead end 24 is installed in the cavity 8. The electrical lead end 24 is located on the side of the annular contact end. A number of elastic levers 25 corresponding to the number of annular conductive tracks 23 are led out from the electrical lead end 24. The elastic levers 25 are in contact with the annular conductive tracks 23 and are connected to the outer sleeve or the motor at each electrical lead end to form an independent output channel. The motor 9 is fixedly connected to the outer sleeve 4 via the upper end cover 10. The lower end of the outer sleeve 4 is fixedly connected to the upper end cover 10 of the motor via a flange. The upper end of the outer sleeve 4 forms a dynamic seal with the lower edge of the adjacent detection turntable 3 via a dynamic sealing ring 5 to prevent air leakage. The outer sleeve 4 has an air intake passage 15 that connects to the exhaust port of the motor. The air intake passage 15 includes air passages evenly distributed circumferentially inside the outer sleeve 4 to guide the exhaust of the motor to the axial dust removal assembly.

[0030] In this embodiment, an axial dust removal component is correspondingly arranged on the side of a laser detection head 2. The axial dust removal component has two sets of double-ring air supply units 16 and sinking air collection units 17 that are coaxially attached to the end faces of the detection turntable and close to each other. The interval between the double-ring air supply units 16 and the sinking air collection units 17 is located in the detection area 14.

[0031] like Figure 3-5As shown, the double-ring air supply unit 16 forms a ring-shaped dust collection port 27 at the upper end of the detection turntable by means of a double-ring air collection channel with inner and outer nesting. The double-ring air collection channel is connected to the air intake passage 14. The sunken air collection unit is set facing the dust collection port 27 by means of a wind-facing plate 28 with an outer diameter larger than the dust collection port 27. The wind-facing plate 28 is embedded in the lower end of the detection turntable and has a sunken air outlet 29. The air outlet axially penetrates the detection turntable. In other embodiments, an air pump 32 is connected to the air outlet 29. The air pump 32 is located on the outside of the detection turntable to enhance the air output capacity.

[0032] The dual-ring air collection channel has an inner ring air channel 161 and an outer ring air channel 162 arranged concentrically. A dust collection port 29 is formed between the inner ring air channel 161 and the outer ring air channel 162. The inner ring air channel 161 has a ring of evenly spaced internal air delivery holes 163 at its root facing the dust collection port 29. The outer ring air channel 162 has a ring of evenly spaced external air delivery holes 164 at its root facing the dust collection port 29. The number of external air delivery holes is not less than the number of internal air delivery holes. The bottom of both the inner ring airway 161 and the outer ring airway 162, near the central axis, are connected to the intake passage 14 via branch ends 30 and common ends 31 of the bend assembly. In this embodiment, the upper end of the intake passage 14 has an opening corresponding to the common end 31. The common end 31 is an independent air chamber connection opening, and the branch ends 30 are separate pipes. The number of branch ends 30 of the bend assembly connected to the outer ring airway 162 is greater than that of the bend assembly connected to the inner ring airway 161. The ring heights of the inner ring airway 161 and the outer ring airway 162 are consistent at the same point, and both gradually decrease in the direction away from the central axis. The ratio of the dust removal port width to the airway height is greater than 2, and the airway height is not less than 2.0 cm. The purpose is to create a cavity with a width greater than the height of the air duct to receive airflow pressure and velocity fluctuations from the internal and external air outlets. A certain air duct height facilitates the smooth outflow of air, generating eddies and intense momentum exchange within the dust collection port. The width of the dust collection port needs to be between 5.0cm and 15.0cm, and the air duct height between 2.0cm and 5.0cm. Maintaining a relatively wide horizontal width of the dust collection port allows for the thorough homogenization of the uneven airflow from the air outlets, forming a low-speed vertical diffusion air curtain, similar to a soft air brush, acting vertically on the film surface to blow away lightweight impurities (such as dust and fibers). Because the airflow direction is vertically downward, it effectively carries impurities into the downward-facing air collection unit directly below.

[0033] The orientation and opposing arrangement of the internal air outlet 163 and the external air outlet 164 help to offset some of the impact force. Since the internal air outlet 163 and the external air outlet 164 eject airflows from the roots of the inner ring air passage 161 and the outer ring air passage 162 respectively, their opposing arrangement causes the two airflows to collide within the dust removal port 29, partially offsetting their impact force and momentum. This reduces the initial high speed and pressure fluctuations of the airflow within the dust removal port, preventing localized high-speed jets from directly impacting the film surface, thus creating a more stable and lower-speed airflow base. The purpose of setting numerous internal air outlets 163 and external air outlets 164 is to avoid affecting the air circulation efficiency of the motor itself. Under the above conditions, in order to increase the exhaust efficiency of the double-ring air supply unit 16 and the sinking air collection unit 17, the distance between the double-ring air supply unit 16 and the sinking air collection unit 17 can be compressed compared with the prior art. The compression of the distance causes the detection area 14 to be axially compressed, that is, the end faces of the two detection turntables are closer together, and the two sets of laser detection heads 2 aligned along the axial direction are also closer together. This also simultaneously promotes the improvement of detection efficiency and accuracy.

[0034] During operation, motor 9 drives the central shaft 1 to rotate two detection turntables 3 synchronously, causing the symmetrical laser detection heads 2 to move along a circular trajectory to measure the thickness of the film 26 passing through the detection area 14. The rotation mode of the detection turntables 3 can be continuous uniform rotation or discontinuous rotation (such as 180° rotation combined with the forward and reverse rotation of the motor) to adapt to different detection scenarios. At the same time, the hot exhaust generated by the operation of motor 9 enters the air intake passage 15 through the exhaust port on the upper end cover 10, and the airflow is guided to the double-ring air collection channel of the double-ring air supply unit 16. The airflow is ejected from the inner air supply hole 163 and the outer air supply hole 164, forming a vertical sweeping airflow at the dust removal port 29, covering the upper surface of the film 26. The sweeping airflow blows dust and debris away from the film surface and suppresses static electricity. During this process, the downward air collection unit 17, which rotates synchronously with the double-ring air supply unit 16, has its wind-facing plate 28 facing the dust removal port 27 above. When the device rotates, the air intake plate 28 and its downward-sloping air outlet 29 together form a dynamic, moving collection port. The width of the dust collection port 27 is preferably greater than the width of the film, which facilitates the downward-sloping airflow carrying impurities towards the air intake plate 28. It should be understood that during rotation, the airflow is mostly directed towards the air intake plate, creating a relatively rapid airflow carrying impurities towards the air intake plate 28 beside the film. Simultaneously, the rotational motion continuously pushes the air in front of the air intake plate 28, creating a low-pressure zone behind it and near the air outlet 29. The airflow, guided by the air intake plate, is blown towards the air outlet 29, which, combined with the active suction provided by the air pump 32 (if installed), greatly enhances the ability to capture air and blown-off impurities within the boundary layer of the lower surface of the film. It can not only efficiently receive impurities falling from above, but also actively disturb and remove dust that may adhere to the lower surface of the film, forming an effective turbulent cleaning effect and expelling it outside the device for continuous cleaning. This vertical exhaust method can minimize the impact on the surrounding environment compared to the horizontal direction. At the same time, since the exhaust position is located outside the motor 9, it can also indirectly cool its outer casing. Together with the air intake passage inside the outer casing, it enhances heat dissipation and improves the working life and efficiency of the motor.

[0035] This invention also discloses a cleaning method for a testing device used in laser film production. The cleaning method is a vertical cleaning method based on a laser film thickness measuring device used in a film production line. The waste heat exhaust generated by the motor that drives the rotating testing turntable is used as the air source and guided upward through the circumferentially distributed air intake passage inside the device.

[0036] The guided airflow enters the dual-ring air supply unit and is ejected through a large number of air supply holes set opposite to each other on its inner and outer ring air channels. The two airflows mix at the dust removal port, so that the initially uneven high-speed airflow is fully homogenized and finally forms a vertical air curtain.

[0037] The vertical air curtain rotates synchronously with the detection turntable, gently and completely covering the upper surface of the film, effectively blowing away light dust and fibers, and suppressing static electricity generation. Below the film, the windward plate of the sunken air collection unit, which rotates synchronously with the air supply unit, faces the air curtain above. The rotational motion naturally creates a dynamic low-pressure zone behind the windward plate, which, in conjunction with the suction force of the air pump, produces a suction effect, drawing away the dust adhering to the lower surface of the film, forming a dynamic turbulent cleaning effect.

[0038] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention are also within the protection scope of the present invention.

Claims

1. A laser film thickness measuring device for a film production line, comprising a central shaft, two detection turntables spaced apart on the central shaft, forming a detection area in the vertical projection space between the two detection turntables; two sets of laser detection heads are axially aligned on the adjacent end faces of the two detection turntables, each set of laser detection heads is aligned to detect one film, and covers the full width of each film with the rotation radius of the detection turntable; the lead wires of the laser detection heads pass through the wiring channel, and the lead wires are connected one-to-one to the annular contact end located on the outer periphery of the central shaft; It also includes an intermediate component and a motor; the intermediate component has an outer sleeve, in which a bearing assembly rotatably supports the lower part of the central shaft is installed in the bearing housing hole of the outer sleeve, and a cavity is opened below the bearing assembly inside the outer sleeve, in which an electrical lead end is installed, the electrical lead end is located beside the annular contact end, and is connected to the annular contact end through an elastic tab; the motor is fixedly connected to the outer sleeve through an upper end cover, and the outer sleeve has an air intake passage that connects to the exhaust port of the motor; Its features are: It also includes an axial dust removal assembly, which has a double-ring air supply unit and a downward air collection unit. The double-ring air supply unit and the downward air collection unit are in two sets, respectively, and are coaxially attached to the end faces of two detection turntables that are close to each other. The interval between the double-ring air supply unit and the downward air collection unit is located in the detection area. The double-ring air supply unit forms a ring-shaped dust removal port facing downward on the upper end face of the detection turntable through the inner and outer nested double-ring air collection channels. The double-ring air collection channels are connected to the air inlet passage. The downward air collection unit is set facing the dust removal port through a wind-facing plate with an outer diameter larger than the dust removal port. The wind-facing plate is embedded in the lower end face of the detection turntable and has a downward air outlet that axially penetrates the detection turntable. The dual-ring air collection channel has an inner ring air channel and an outer ring air channel arranged concentrically. The dust removal port is formed between the inner ring air channel and the outer ring air channel. The root of the inner ring air channel facing the dust removal port has a ring of evenly spaced internal air delivery holes. The root of the outer ring air channel facing the dust removal port has a ring of evenly spaced external air delivery holes. The bottom of both the inner and outer ring air passages, near the central axis, are connected to the intake passage via branch ends and a common end of the bend assembly. The outer ring air passage is connected to more branch ends of the bend assembly than the inner ring air passage. The ring heights of the inner and outer ring air passages are consistent at the same point, and both gradually decrease in the direction away from the central axis.

2. The laser film thickness measuring device for a film production line according to claim 1, characterized in that: The number of external air outlets shall not be less than the number of internal air outlets.

3. The laser film thickness measuring device for a film production line according to claim 1, characterized in that: The ratio of the width of the dust removal port to the height of the air duct is greater than 2.

4. The laser film thickness measuring device for a film production line according to claim 1, characterized in that: An air pump is connected to the air outlet, and the air pump is located on the outside of the detection turntable.

5. The laser film thickness measuring device for a film production line according to claim 1, characterized in that: The laser detection head leads pass through the reserved channel of the detection turntable and the reserved hole of the central rotating shaft in sequence into the wiring channel; multiple insulating rings are fixedly sleeved on the outer circumference of the central rotating shaft, and an independent annular conductive track is embedded on the outer surface of each insulating ring. The leads extend and connect to the junction of the annular conductive track in the wiring channel; elastic tabs corresponding to the number of annular conductive tracks are led out from the lead end, and the elastic tabs are in contact with the annular conductive tracks. The leads are connected to the outer sleeve or to the outside of the motor at each lead end.

6. The laser film thickness measuring device for a film production line according to claim 5, characterized in that: Two electrical leads are provided inside the cavity, and the contact heads of the elastic tabs of the two electrical leads are centrally symmetrical and connected to the annular conductive track.

7. The laser film thickness measuring device for a film production line according to claim 6, characterized in that: The lower end of the outer sleeve is fixedly connected to the upper end cover of the motor via a flange; the upper end of the outer sleeve forms a dynamic seal with the lower edge of the adjacent detection turntable via a dynamic sealing ring.

8. A cleaning method for a laser film thickness measuring device for a film production line as described in any one of claims 1-7, characterized in that: The cleaning method is a vertical cleaning method based on the laser film thickness measuring device used in the film production line. The waste heat exhaust generated by the motor that drives the rotating detection turntable is used as the air source and guided upward through the circumferentially distributed air intake passage inside the device. The guided airflow enters the dual-ring air supply unit and is ejected through a large number of air supply holes set opposite to each other on its inner and outer ring air channels. The two airflows mix at the dust removal port, so that the initially uneven high-speed airflow is fully homogenized and finally forms a vertical air curtain. The vertical air curtain rotates synchronously with the detection turntable, gently and completely covering the upper surface of the film, effectively blowing away light dust and fibers, and suppressing static electricity generation. Below the film, the windward plate of the sunken air collection unit, which rotates synchronously with the air supply unit, faces the air curtain above. The rotational motion naturally creates a dynamic low-pressure zone behind the windward plate, which, in conjunction with the suction force of the air pump, produces a suction effect, drawing away the dust adhering to the lower surface of the film, forming a dynamic turbulent cleaning effect.

Images