A detection device and method for laser film production

Abstract

The application discloses a kind of detection device and method for laser film production;Including transfer shaft, synchronous rotation upper and lower detection turntable, intermediate assembly and driving motor;Detection turntable is equipped with multiple sets of laser detection head, its lead-out wire is connected to its outer circumferential annular conductive track via the passage in transfer shaft;The elastic tab of the type cavity of intermediate assembly is contacted with annular conductive track and realizes rotation power transmission;Motor drives transfer shaft to drive detection turntable to rotate, so that laser detection head scans the thickness of film placed in the detection area between turntable along circumferential trajectory;Detection turntable is connected by columnar disc, and the internal annular air path collects motor operation airflow, and forms sweeping airflow that is symmetrically divided and covers the width of film through circumferential airflow outlet, synchronously cleans detection area and inhibits static electricity.The application realizes efficient, high-precision, multi-channel online thickness measurement, and integrates self-cleaning function, solves the problem of efficiency and precision contradiction, high cleaning sensitivity and production line expansion difficulty in traditional technology.

Description

Technical Field

[0001] This invention relates to a laser inspection device and method, and more particularly to an inspection device and method for laser film production. Background Technology

[0002] In the field of precision thin film manufacturing (such as optical films and PET coated films), online measurement of film thickness directly determines product quality. Traditional laser thickness measurement uses a through-beam dual-probe principle, where symmetrical laser probes measure the distances (B1, B2) to the film surface, and the thickness is calculated by subtracting the distance value from a fixed spacing A (H = A - B1 - B2). Its implementation methods fall into three categories: single-point type, using a single probe for static measurement, applicable only to narrow-width materials; scanning type, using a single probe to reciprocate along a Z-shaped trajectory to cover a wide width, but suffering from efficiency loss due to idle travel, mechanical vibration interference, and cosine errors caused by laser incident angle deviation; and multi-point type, with multiple fixed probes arranged in parallel, resulting in a complex and costly system.

[0003] The common drawbacks of the above methods are:

[0004] Due to its sensitivity to cleanliness, laser thickness measurement is sensitive to water film, oil, and dust. Existing equipment lacks an integrated in-situ cleaning solution and requires an external blowing system or shutdown for cleaning.

[0005] Efficiency and accuracy are at odds. The reciprocating motion of Z-scanning leads to low detection efficiency, and vibration and non-orthogonal incidence reduce measurement consistency.

[0006] Expanding multiple production lines presents bottlenecks, and adding more testing channels requires additional hardware (such as multiple scanning mechanisms), leading to an exponential increase in system complexity and cost. Summary of the Invention

[0007] To address the shortcomings of the aforementioned technologies, this invention provides a testing device and method for laser film production.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: a testing device for laser film production, comprising:

[0009] The transfer shaft has a cable routing channel arranged along the axial direction;

[0010] A synchronous rotating laser beam assembly has two detection turntables symmetrically installed at intervals in the middle or upper part of the central rotating shaft. A detection zone is formed in the vertical projection space between the two detection turntables. At least two films are allowed to move along the direction parallel to the plane of symmetry between the two detection turntables for laser thickness measurement within the detection zone. At least 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 at least half the 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 are connected one-to-one to the annular contact end located on the outer periphery of the central rotating shaft.

[0011] 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. A cavity is opened in the outer sleeve below the bearing assembly, and an electrical lead is installed in the cavity. The electrical lead is located beside the annular contact end and is connected to the annular contact end through an elastic lever.

[0012] The motor is fixedly connected to the outer sleeve through the upper end cover, and its shaft extension end is inserted into the outer sleeve and coaxially connected to the central shaft.

[0013] Furthermore, the two detection turntables are connected as one unit by a cylindrical disc, and the cavity inside the cylindrical disc is penetrated by the central rotating shaft to form an annular air passage; the periphery of the annular air passage is connected to the airflow outlet set on the cylindrical disc, and the outlet direction of the airflow outlet faces the detection area; the bottom side of the annular air passage is connected to the exhaust port of the motor through several air intake passages formed together with the outer casing.

[0014] Furthermore, the airflow outlet is horizontally oriented towards the direction of the laser detection head, and the purge air path of the airflow outlet is evenly divided vertically by the symmetrical surface between the detection turntables.

[0015] Furthermore, the airflow outlet consists of multiple vertically offset inclined channels, with the airflow outlets symmetrically facing the symmetrical plane of the detection turntable.

[0016] Furthermore, the intake passage includes several first air passages evenly distributed circumferentially around the central axis and connected below the annular air passage; several second air passages evenly distributed circumferentially around the central axis inside the outer casing; and several third air passages opened on the upper end cover of the motor; the first air passages, second air passages, and third air passages are aligned and connected.

[0017] Furthermore, several second air passage rings are arranged around the bearing assembly and the cavity below it.

[0018] Furthermore, the laser head lead wire passes sequentially through the reserved channel of the detection turntable and the reserved hole of the central rotating shaft 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 lead wire extends out and connects 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. The wires are connected to the outer sleeve or to the outside of the motor at each lead end.

[0019] 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.

[0020] 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.

[0021] Working method of the inspection device for laser film production:

[0022] The working methods include a synchronous rotating laser-guided thickness measurement method for dual-path films, and a purging method for keeping the films clean based on the synchronous rotating laser-guided thickness measurement method for dual-path films.

[0023] The synchronous rotating laser thickness measurement method for dual-path films is to drive the central shaft of the motor to drive the two detection turntables to rotate synchronously, so that the upper and lower symmetrical laser detection heads move synchronously along the circumferential trajectory. During the detection, several films can pass through the detection area at a constant speed in the opposite direction along the symmetrical plane of the overlapping detection turntables. The rotation radius of the laser detection head covers the full width or half width of the film.

[0024] The cleaning method for maintaining film cleanliness in the synchronous rotation laser thickness measurement method for dual-path films utilizes the hot exhaust generated during motor operation as the air source for the cleaning airflow. The hot exhaust is discharged upward through several third air passages opened on the upper end cover of the motor, and then enters several circumferentially distributed second air passages inside the outer casing that are aligned and connected to the third air passages. The airflow continues upward and passes through several circumferentially distributed first air passages 15 located below the annular air passages that are aligned and connected to the second air passages, with the central rotating shaft as the center. After passing through the first air passages 15, the airflow enters the annular air passage formed by the internal cavity of the cylindrical disk and the central rotating shaft passing through it for collection and distribution. The distributed airflow is ejected through the airflow outlets set on the periphery of the cylindrical disk. The airflow outlets are configured so that the direction of the ejected cleaning airflow faces the detection area. Its flow path is evenly divided vertically by the symmetrical surface between the detection turntables, forming a uniform, symmetrical cleaning airflow field covering the width of the film on the upper and lower surfaces of the film and on the path through the detection area to blow away dust and debris and suppress static electricity.

[0025] This invention discloses a testing device and method for laser film production, providing innovative solutions to three core problems of traditional laser thickness measuring devices: cleanliness sensitivity, the contradiction between efficiency and accuracy, and the bottleneck of multi-production line expansion.

[0026] By creatively utilizing the exhaust gas generated by the motor as an air source, and through a carefully designed annular air path and symmetrically segmented air outlets, a uniform, symmetrical, and wide-coverage blowing airflow field is formed on the upper and lower surfaces of the film in the detection area while simultaneously detecting thickness. This effectively blows away dust and debris and suppresses static electricity, eliminating the need for complex external cleaning systems or frequent shutdowns for cleaning, thus significantly improving the stability and reliability of online detection.

[0027] Employing a synchronously rotating dual-detection turntable design, the symmetrically positioned laser detection heads continuously scan along a circular trajectory. This design completely eliminates the reciprocating idle stroke of traditional Z-shaped scanning, significantly improving the effective detection rate. Simultaneously, the uniform circular motion avoids mechanical vibration interference, and the annular detection zone ensures the laser beam remains perpendicular to the film surface, completely eliminating cosine errors caused by non-orthogonal measurements, achieving high precision with high efficiency.

[0028] The annular detection zone design, combined with a modular rotating power supply scheme, makes it very convenient and economical to arrange multiple laser detection heads along the circumference on the same rotating device. Adding detection channels only requires adding corresponding laser head groups and their independent circuit channels on the circumference, without the need for complex mechanical scanning mechanisms. The system complexity and cost increase are far lower than traditional multi-point or scanning solutions, achieving efficient and low-cost multi-production line expansion capabilities. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0030] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 3 This is the front view of the present invention.

[0032] Figure 4 This is a schematic diagram showing the structural positions of the lead-in terminal and the annular contact terminal.

[0033] Figure 5 Schematic diagram of the airflow outlet structure Figure 1 .

[0034] Figure 6 Schematic diagram of the airflow outlet structure Figure 2 .

[0035] 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; 11. Columnar disc; 12. Annular air path; 13. Air outlet; 14. Detection area; 15. First air path; 16. Second air path; 17. Third air path; 18. Lead wire; 19. Reserved channel; 20. No. 1 oil pipe; 21. No. 2 oil pipe; 22. Insulating ring; 23. Annular conductive track; 24. Lead-in terminal; 25. Elastic lever; 26. Film. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1-3 As shown, in this embodiment, a testing device for laser film production includes a central rotating shaft 1, a synchronous rotating laser beam assembly, an intermediate assembly, and a motor 9. Specifically, the central rotating shaft 1 is the central rotating shaft of the entire testing center. The shaft is hollow inside, and the hollow area is arranged along the axial direction. This area can serve as the wiring channel 21 for the lead wire of the laser testing head 2. The synchronous rotating laser beam assembly has two testing turntables 3 installed symmetrically and at intervals in the middle of the central rotating shaft 1. In other embodiments, the two testing turntables 3 can be arranged on the upper part of the central rotating shaft 1. Whether the central rotating shaft 1 is at the upper or middle part, the purpose is to elevate the two testing turntables. 3. This allows the component to rotate synchronously with the central rotating shaft 1, while reserving mounting positions for other components at the lower part of the central rotating shaft 1. The intermediate component has an outer sleeve 4, the upper end of which forms a dynamic seal with the lower edge of the adjacent detection turntable 3 through a dynamic sealing ring 5. The inner part of the outer sleeve 4 has a bearing seat 6, and a bearing assembly 7, which is rotatably supported at the lower part of the central rotating shaft 1, is installed in the hole of the bearing seat 6. A cavity 8 is opened below the bearing assembly 7 inside the outer sleeve 4. In this embodiment, paired diagonal contact ball bearings are used to support the rotational movement of the central rotating shaft 1, transferring the radial and axial loads of the turntable assembly to the outer sleeve 4, ensuring that the concentricity error of the central rotating shaft 1 is ≤0.02mm. The motor 9 is fixedly connected to the outer sleeve 4 through the upper end cover 10, and its shaft extension end passes into the outer sleeve 4 and is coaxially connected to the central rotating shaft 1. The flange of the outer sleeve 4 is fixedly connected to the upper end cover 10 of the motor 9.

[0038] In this embodiment, the detection turntable 3 is a circular disc fixedly installed on two upper and lower positions of the central rotating shaft 1. The two detection turntables 3 are connected as one unit by a cylindrical disc 11 at their middle position. The central rotating shaft 1 passes through the center of the cylindrical disc 11, which has a cavity inside. The central rotating shaft 1 passes through the cavity from the center to form an annular air passage 12. The periphery of the annular air passage 12 is connected to an airflow outlet 13 on the cylindrical disc 11. Airflow flows out from the annular air passage 12 through the airflow outlet 13. The outlet direction of the airflow outlet 13 faces the detection area 14. The detection area 14 is the area for detecting the film thickness. The detection area 14 is spaced between the two detection turntables 3, forming the detection area 14 in the vertical projection space of the two. The effective space of this detection area is an annular body formed after removing the space of the cylindrical disc 11. Multiple films are allowed to move along the direction parallel to the symmetry plane between the two detection turntables 3 for laser thickness measurement. Figure 5 As shown, the air supply side of the annular air passage 12 is connected to the exhaust port of the motor 9 through several air intake passages formed together with the inner casing 4. The air intake passages include several first air passages 15 that are evenly distributed circumferentially with the central shaft 1 as the center, which are connected to the lower part of the annular air passage 12; several second air passages 16 that are evenly distributed circumferentially with the central shaft 1 as the center, which are connected to the inner casing 4; and several third air passages 17 that are opened on the upper end cover 10 of the motor 9. The first air passages 15, second air passages 16 and third air passages 17 are connected sequentially. Several second air passages 16 are arranged around the bearing assembly 7 and the cavity 8 below it. The second air passages 16 arranged around the bearing assembly 7 simultaneously form a heat dissipation air duct, guiding the waste heat airflow of the motor 9 to the annular air passage 12 while actively cooling the temperature rise of the bearing assembly 7 to prevent thermal expansion from causing changes in the fit clearance. The heat dissipation air of the motor 9 is input into the annular air passage 12 through the air intake passage. Therefore, the purpose of setting the annular air passage 12 is to form an air collection cavity at the position of the detection area 14. It is located in the middle and is annular, and can reach the detection area 14 360°. It gives great flexibility to the opening position of the airflow outlet 13, which can be arbitrarily opened according to the position of the diaphragm.

[0039] For example, in this embodiment, such as Figure 5As shown, the airflow outlet 13 is horizontally oriented towards the laser detection head, and the purge air path of the airflow outlet 13 is evenly divided vertically by the symmetrical plane between the detection turntables 3. The advantage of this is that the upper and lower surfaces of the film 26 can be reached by using an independent airflow outlet 13. This effect is also achieved by the favorable conditions of the annular air path 12. Of course, multiple sets of airflow outlets 13 can also be evenly arranged in a ring around the circumference. Two sets of laser detection heads are axially aligned on the end faces of the two detection turntables 3. Each set of laser detection heads initially aligns and detects one film 26, and covers the full width of each film as the rotation radius of the detection turntable 3 rotates. The laser detection head moves in a circle with the turntable, and the annular detection area 14 is coaxially matched with the rotation trajectory of the laser detection head 2, ensuring that the scanning optical path is perpendicular to the film surface throughout, eliminating thickness errors caused by non-orthogonal measurement. The two films are arranged side by side on both sides of the cylindrical disk 11, and the two films are set in a parallel position, which supports synchronous detection of films on two production lines.

[0040] Note the data identification and positioning issues during dual-film inspection. In practice, laser detection heads can be grouped and installed on the turntable end face according to film positions. Each group of laser detection heads independently corresponds to one film. The laser head lead wire of each film is connected to the annular conductive track on the dedicated insulating ring on the outer periphery of the central shaft. The elastic levers at the lower lead end contact the track groups, outputting physically isolated electrical signal channels. Signal transmission is non-intersecting, and the system directly determines the film position from which the data originates. By dynamically adjusting the partition angle through software, it can adapt to films of different widths and asymmetrical layouts, achieving a precise correspondence between the laser detection head and each side of the film. For example, at a rotation speed of 3000 rpm, the software controls the rotation speed combined with angle partitioning to achieve an effective detection time of 10 ms / revolution (180° interval) for each group of laser detection heads at the initial position of each side of the film; the detectable point density is 500 points / meter (at a film speed of 10 m / s). By controlling the rotation speed and angle partitioning trigger through software, a dynamic one-to-one correspondence between the laser detection head and each side of the film is achieved, while significantly simplifying the hardware structure.

[0041] An angle encoder can also be integrated into the motor or transfer shaft to record the rotation angle of each laser detection head in real time, providing the instantaneous orientation of the laser head on its circular trajectory. The film movement speed is synchronized; the film production line speed sensor provides the film's moving speed v, and the system obtains the longitudinal displacement L (position in the length direction) of the film by time integration. The spatial coordinates of the problem point are calculated using the following parameters: the lateral position (width direction) is determined by the laser head's rotation radius R and angle θ, i.e., X = R × cosθ. The longitudinal position (length direction) is determined by the film's moving speed v and the detection time t, i.e., Y = v × t. When the laser detection head detects a thickness anomaly at θ = 30°, and the film has moved Y = 50 mm, the coordinates of the problem point are (X, Y). In the event of a large-area thickness anomaly, the controller threshold range is triggered, initiating the shutdown mechanism.

[0042] For example, in other embodiments, such as Figure 6 As shown, the air outlet 13 consists of multiple vertically offset inclined channels. The air outlet 13 is symmetrically oriented towards the symmetrical plane of the detection turntable 3. When the film's adhesive surface coincides with the symmetrical plane, each set of air outlets 13 forms a counter-blowing effect on the upper and lower sides of the film's adhesive surface.

[0043] In both this embodiment and other embodiments, the annular detection area 14 enables the simultaneous detection of multiple films. The annular detection area 14 is a ring-shaped space extending 360° around the center of the rotating axis 1. This annular structure itself provides a natural physical basis for arranging detection points at different angles. The laser detection head is mounted on the end face of the detection turntable 3. It should be understood that because the detection turntable 3 is circular and its end face covers the entire annular detection area 14, multiple laser detection head groups can be installed at different angles along the circumference of the same detection turntable 3. The laser detection head moves in a circular motion with the turntable, forming an arc-shaped detection path. Compared to the sawtooth detection path of traditional technology, the circular motion is continuous, without the acceleration, deceleration, and reversal pauses of reciprocating motion. It can cover a larger area per unit time because the traditional method requires the laser head or reflector to perform reciprocating linear acceleration, deceleration, pause, and reverse motion on the X-axis (film width direction) or Y-axis (film length direction) to form a sawtooth scanning path. The vibration generated by uniform rotation is much smaller than that of linear motion with frequent starts, stops, and reversals. This also improves the system stability, measurement accuracy, and lifespan. At the same time, only one rotary motor 9 is needed to drive the central shaft 1 / turntable to achieve the scanning motion. The control algorithm is relatively simple, mainly focusing on speed control.

[0044] In this embodiment, as Figure 1 As shown, the lead wire 18 of the laser detection head 2 is configured as an internal wiring, and the lead wire passes through the wiring channel 21. The lead wire is connected one-to-one to the annular contact end located on the outer periphery of the central shaft 1. Specifically, the lead wire of the laser detection head passes through the reserved channel 19 of the detection turntable 3 and the reserved hole 20 of the central shaft 1 in sequence before entering the wiring channel 21. The reserved channel is a channel that runs horizontally along the main body of the detection turntable 3. The lead wire first passes through the reserved channel, then through the reserved hole 20, and then enters the wiring channel 21. Figure 4The wiring channel 21 of the central shaft 1 shown has multiple insulating rings 22 fixedly sleeved around its outer circumference. Each insulating ring has an independent annular conductive track 23 embedded on its outer surface. The lead wire extends out and passes through the side wall of the central shaft 1 at the corresponding position to connect to the annular conductive track, or connects to the annular conductive track to form a contact point within the wiring channel 21. Note that when the central shaft 1 rotates, it drives the detection turntable 3, laser detection head 2, and lead wire 18 to rotate synchronously. To eliminate cable entanglement caused by rotation, an electrical lead end 24 is installed in the cavity 8. The cavity 8 is located below the bearing assembly 7, and the electrical lead end is located beside the annular contact end. It is connected to the annular conductive track 23 of the annular contact end through an elastic lever 25. The number of elastic levers corresponding to the number of annular conductive tracks is led out from the electrical lead end. The elastic levers are connected to the annular conductive track, and wires are connected to the outer sleeve 4 or to the outside of the motor 9 at each electrical lead end to form an independent output channel. The internal wiring design enables dynamic power transmission of the rotating components with zero external exposure, avoiding scratches on the film.

[0045] In other embodiments, two leads are provided in the cavity 8, and the contact heads of the elastic tabs of the two leads are centrally symmetrically connected to the annular conductive track, thereby improving the expansion capability of the laser detection head.

[0046] At the same time, the present invention also discloses the working method of the inspection device for laser film production:

[0047] The working methods include a synchronous rotating laser-guided thickness measurement method for dual-path films, and a purging method for keeping the films clean based on the synchronous rotating laser-guided thickness measurement method for dual-path films.

[0048] The synchronous rotating laser thickness measurement method for dual-film is achieved by using a motor 9 to drive a central shaft 1, which in turn drives two detection turntables 3 to rotate synchronously. This allows the symmetrical laser detection heads to move synchronously along a circular trajectory. During the detection process, several films can pass through the detection area 14 at a constant speed in the opposite direction to the rotation direction of the turntables 3. The rotation radius of the laser detection head covers the full width or half width of the film. It should be understood that the rotation mode of the detection turntable 3 is not limited to continuous and uniform rotation. If a single film is being tested, a continuous 360° uniform rotation can be used, provided that the rotation radius of the laser detection head covers the full width of the film. If two films are being tested, a non-continuous rotation (180° rotation combined with forward and reverse motor rotation) can be used, provided that the rotation radius of the laser detection head covers the full width of the film. This ensures that each set of laser detection heads corresponds to only one film. Of course, the controller program can also be used to increase the rotation speed and scanning interval in the defect area, etc., to achieve various testing methods for different testing scenarios.

[0049] The cleaning method for maintaining film cleanliness in the synchronous rotational laser thickness measurement method for dual-path films utilizes the hot exhaust generated during the operation of motor 9 as the air source for the cleaning airflow. The hot exhaust is discharged upward through several third air passages 17 opened on the upper end cover 10 of motor 9, and then enters several circumferentially evenly distributed second air passages 16 inside the outer jacket 4, which are sequentially connected to the third air passages 17. The airflow continues upward, passing through several circumferentially evenly distributed first air passages 15 located below the annular air passage 12 and sequentially connected to the second air passages 16, with the central axis 1 as the center. After passing through the first air passage 15, the airflow enters the annular air passage 12 formed by the internal cavity of the cylindrical disk 11 and the central rotating shaft 1 passing through it for collection and distribution. The distributed airflow is ejected through the airflow outlet 13 located on the periphery of the cylindrical disk 11. The airflow outlet 13 is configured so that the direction of the ejected purge airflow faces the detection area 14. Its flow path is evenly divided vertically by the symmetrical plane between the detection turntables 3, forming a uniform, symmetrical purge airflow field covering the width of the film on the upper and lower surfaces of the film and on the path through the detection area 14 to blow away dust and debris and suppress static electricity.

[0050] The above embodiments are not intended to limit the present invention. Unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the technical solutions of the present invention are also within the protection scope of the present invention. Furthermore, the technical features involved in the different embodiments of the present application described above can be combined with each other as long as they do not conflict with each other.

Claims

1. A testing device for laser film production, characterized in that, include: The transfer shaft has a cable routing channel arranged along the axial direction; A synchronous rotating laser beam assembly has two detection turntables symmetrically installed at intervals in the middle or upper part of the central rotating shaft. A detection zone is formed in the vertical projection space between the two detection turntables. At least two films are allowed to move along the direction parallel to the plane of symmetry between the two detection turntables for laser thickness measurement within the detection zone. At least 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 at least half the 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 are connected one-to-one to the annular contact end located on the outer periphery of the central rotating shaft. 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. A cavity is opened in the outer sleeve below the bearing assembly, and an electrical lead is installed in the cavity. The electrical lead is located beside the annular contact end and is connected to the annular contact end through an elastic lever. The motor is fixedly connected to the outer sleeve through the upper end cover, and its shaft extension end is inserted into the outer sleeve and coaxially connected to the central shaft. The two detection turntables are connected as one unit by a cylindrical disk. The cavity inside the cylindrical disk is penetrated by a central rotating shaft from the center to form an annular air passage. The periphery of the annular air passage is connected to the air outlet on the cylindrical disk, and the outlet of the air outlet faces the detection area. The bottom side of the annular air passage is connected to the exhaust port of the motor through several air intake passages formed together with the inner casing. The air intake passage includes several first air passages that are evenly distributed circumferentially around the central pivot shaft and connected below the annular air passage; several second air passages that are evenly distributed circumferentially around the central pivot shaft inside the outer casing; and several third air passages that are opened on the upper end cover of the motor; the first air passages, second air passages and third air passages are aligned and connected. The laser head lead wire passes sequentially through the reserved channel of the detection turntable and the reserved hole of the central rotating shaft 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 lead wire extends out and connects 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. The wires are connected to the outer sleeve or to the outside of the motor at each lead end.

2. The testing device for laser film production according to claim 1, characterized in that: The airflow outlet is horizontally oriented towards the laser detection head, and the purge air path of the airflow outlet is evenly divided vertically by the symmetrical surface between the detection turntables.

3. The testing device for laser film production according to claim 2, characterized in that: The airflow outlet consists of multiple vertically offset inclined channels, with the airflow outlets symmetrically facing the symmetrical plane of the detection turntable.

4. The testing device for laser film production according to claim 1, characterized in that: Several second air passage rings are arranged around the bearing assembly and the cavity below it.

5. The testing device for laser film production according to claim 1, 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.

6. The testing device for laser film production according to claim 5, 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.

7. The operating method of the inspection device for laser film production according to any one of claims 1-6, characterized in that: The working method includes a synchronous rotational laser-guided thickness measurement method for dual-path films, and a purging method for keeping the films clean based on the synchronous rotational laser-guided thickness measurement method for dual-path films. The synchronous rotating laser thickness measurement method for dual-path films is achieved by driving a central shaft with a motor to rotate two detection turntables synchronously, so that the upper and lower symmetrical laser detection heads move synchronously along a circular trajectory. During the detection, several films can pass through the detection area at a uniform speed in the opposite direction along the symmetrical plane of the overlapping detection turntables. The rotation radius of the laser detection head covers the full width or half width of the film. The cleaning method for keeping the film clean based on the synchronous rotation laser thickness measurement method for dual-path films uses the hot exhaust generated during motor operation as the air source for the cleaning airflow. The hot exhaust gas is discharged upward through several third air passages opened on the upper end cover of the motor, and then enters several circumferentially distributed second air passages inside the outer jacket that are aligned and connected to the third air passages. The airflow continues upward and passes through several circumferentially distributed first air passages located below the annular air passages that are aligned and connected to the second air passages and are circumferentially distributed with the central rotating shaft as the center. After passing through the first air passages, the airflow enters the annular air passage formed by the internal cavity of the cylindrical disk and the central rotating shaft passing through it for collection and distribution. The distributed airflow is ejected through the airflow outlets set on the periphery of the cylindrical disk. The airflow outlets are configured so that the direction of the ejected purge airflow faces the detection area. Its flow path is evenly divided vertically by the symmetrical surface between the detection turntables, forming a uniform, symmetrical purge airflow field covering the width of the film on the upper and lower surfaces of the film and on the path passing through the detection area to blow away dust and debris and suppress static electricity.

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