Detection device and method for laser film production

Abstract

The invention discloses a detection device and method for laser film production. Comprising a middle rotating shaft, upper and lower detection turntables, a middle assembly and a driving motor, the detection turntable is provided with a plurality of groups of laser detection heads, and outgoing lines of the laser detection heads are connected to a peripheral annular conductive track through a channel in the transfer shaft; an elastic shifting piece at a power leading end in a cavity of the middle assembly is in contact with the annular conductive track to realize rotary power transmission; the motor drives the middle rotating shaft to drive the detection turntable to rotate, so that the laser detection head scans the thickness of a film in a detection area between the turntables along a circumferential track; the detection rotating discs are connected through columnar discs, motor operation airflow is collected through internal annular air paths of the detection rotating discs, blowing airflow which is symmetrically divided and covers the film breadth is formed through peripheral airflow outlets, a detection area is synchronously cleaned, and static electricity is restrained. According to the invention, high-efficiency, high-precision and multi-channel online thickness measurement is realized, a self-cleaning function is integrated, and the problems of contradiction between efficiency and precision, high cleaning sensitivity and difficult production line expansion in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to a laser detection device and method, and particularly to a detection device and method for laser film production. Background Art

[0002] In the field of precision thin film manufacturing (such as optical film, PET coated film), the on-line measurement of film thickness directly determines the product quality. The traditional laser thickness measurement adopts the principle of opposed double probes. The upper and lower symmetric laser probes respectively measure the distances (B1, B2) to the film surface, and the thickness is calculated by subtracting the distance values from the fixed distance A (H = A - B1 - B2). Its implementation methods are divided into three categories: single-point type, static measurement with a single group of probes, only applicable to narrow-width materials; scanning type, using a single probe to reciprocate along a Z-shaped trajectory to cover a wide width, but there are problems such as empty stroke efficiency loss, mechanical vibration interference, and cosine error caused by the deviation of the laser incident angle; multi-point type, multiple groups of fixed probes are arranged side by side, with a complex system and high cost.

[0003] The common defects of the above methods are as follows: Cleaning sensitivity: Laser thickness measurement is sensitive to water film / oil stain / dust. Existing equipment lacks an in-situ integrated cleaning solution and requires an external purging system or shutdown for cleaning.

[0004] Contradiction between efficiency and accuracy: The reciprocating movement of Z-shaped scanning results in low detection efficiency, and vibration and non-orthogonal incidence reduce the measurement consistency.

[0005] Bottleneck for multi-production line expansion: Adding detection channels requires superimposing hardware (such as multiple groups of scanning mechanisms), and the system complexity and cost increase exponentially. Summary of the Invention

[0006] In order to solve the deficiencies of the above technologies, the present invention provides a detection device and method for laser film production.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A detection device for laser film production, comprising: A central rotating shaft having a wire routing channel arranged along the axial direction; A synchronous rotation type laser opposed assembly, in which two detection turntables are symmetrically and spaced up and down in the middle or upper part of the central rotating shaft, and a detection area is formed in the vertical projection space between the two detection turntables; at least two films are allowed to move in the detection area along a direction parallel to the symmetry plane between the two detection turntables for laser thickness measurement; at least two groups of laser detection heads are axially aligned on the end faces of the two detection turntables close to each other, each group of laser detection heads detects one film in alignment, and at least covers half of the width of each film along the rotation radius of the detection turntable; the lead wires of the laser detection heads penetrate into the wire routing channel, and the lead wires are respectively connected to the annular contact ends located on the outer circumference of the central rotating shaft; An intermediate component, having an outer casing, in which a bearing group that rotatably supports the lower part of the middle rotating shaft is installed in the bearing seat hole of the outer casing. A cavity is provided below the bearing group in the outer casing, and a power lead terminal is installed in the cavity. The power lead terminal is located beside the annular contact terminal and is in contact connection with the annular contact terminal through an elastic flap. A motor, fixedly connected to the outer casing through an upper end cover, and its shaft extension end penetrates into the outer casing and is coaxially connected to the middle rotating shaft.

[0008] Further, the two detection turntables are integrally connected by a columnar disc. The cavity inside the columnar disc is penetrated by the middle rotating shaft from the center to form an annular air path. Air flow outlets are provided on the circumferential side of the annular air path and are arranged on the columnar disc. The outlet direction of the air flow outlets faces the detection area. The bottom side of the annular air path is communicated with the exhaust port of the motor through a plurality of intake passages formed jointly with the inside of the outer casing.

[0009] Further, the air flow outlets are horizontally oriented towards the direction where the laser detection head is located, and the purging air path of the air flow outlets is evenly divided up and down by the symmetry plane between the detection turntables.

[0010] Further, the air flow outlets are a plurality of inclined flow channels that are offset up and down, and the air flow outlets are symmetrically oriented towards the symmetry plane of the detection turntables.

[0011] Further, the intake passages include a plurality of first air paths that are circumferentially and evenly distributed with the middle rotating shaft as the center and are communicated below the annular air path; a plurality of second air paths that are circumferentially and evenly distributed with the middle rotating shaft as the center inside the outer casing, and a plurality of third air paths that are provided on the upper end cover of the motor; the first air paths, the second air paths, and the third air paths are in alignment and communication.

[0012] Further, a plurality of second air paths are annularly arranged around the periphery of the bearing group and the cavity below it.

[0013] Further, the laser head lead wire sequentially passes through the reserved channel of the detection turntable and the reserved hole of the middle rotating shaft and penetrates into the wiring channel; a plurality of insulating rings are fixedly sleeved on the outer periphery of the middle rotating shaft. An independent annular conductive track is embedded on the outer surface of each insulating ring. The lead wire extends downward and is connected to the contact point of the annular conductive track in the wiring channel; elastic flaps corresponding to the number of the annular conductive tracks are led out on the power lead terminal. The elastic flaps are in contact connection with the annular conductive tracks and are wired outward from each power lead terminal to the outside of the outer casing or through the motor.

[0014] Further, two power lead terminals are provided in the cavity. The contact heads of the elastic flaps of the two power lead terminals are in central symmetry contact connection with the annular conductive tracks.

[0015] Further, the lower end of the outer casing is fixedly connected to the upper end cover of the motor through a flange; the upper end of the outer casing forms a dynamic seal with the lower edge of the adjacent detection turntable through a dynamic seal ring.

[0016] Working method of the detection device for laser film production: The working method includes a synchronous rotation laser beam thickness measurement method for dual-pass films, and a blowing method for keeping the films clean based on the synchronous rotation laser beam thickness measurement method for dual-pass films. For the synchronous rotating laser beam thickness measurement method of dual-path films, a motor drives the central shaft to drive the two detection turntables to rotate synchronously, so that the upper and lower symmetrical laser detection heads move synchronously along a circular trajectory. During the detection period, several films can be passed through the detection area at a uniform speed in opposite directions along the symmetric planes of the overlapping detection turntables. The rotation radius of the laser detection head covers the full width or half the width of the film. The purge method for keeping the film clean under the synchronous rotation laser beam thickness measurement method for dual-path film is to use the hot exhaust gas generated during the operation of the motor as the gas source of the purge airflow; the hot exhaust gas is discharged upward through a plurality of third air paths opened on the upper end cover of the motor, and then enters a plurality of circumferentially uniformly distributed second air paths in the outer sleeve that is connected to the third air paths in a positional manner, and the airflow continues to upward and passes through a plurality of circumferentially uniformly distributed first air paths 15 located below the annular air path and connected to the second air paths in a positional manner, with the central axis as the center of the circle; after passing through the first air path 15, the airflow enters the annular air path formed by the internal cavity of the cylindrical disk and the central axis passing through it for collection and distribution; the distributed airflow is ejected through the airflow outlet arranged on the circumferential side of the cylindrical disk, and the airflow outlet is constructed so that the direction of the ejected purge airflow faces the detection area, and its flow path is evenly divided up and down by the symmetry plane 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.

[0017] The present invention discloses a detection device and method for laser film production, which provides innovative solutions to the three core problems of traditional laser thickness measurement devices: cleaning sensitivity, the contradiction between efficiency and accuracy, and the bottleneck of multi-production line expansion. The exhaust gas generated by the running motor is creatively used as the air source. Through the carefully designed annular air path and symmetrically divided air flow outlets, a uniform, symmetrical, and wide-coverage purge airflow field is formed on the upper and lower surfaces of the film in the detection area during thickness detection, effectively blowing away dust and debris and suppressing static electricity. There is no need for an external complex cleaning system or frequent shutdowns for cleaning, which significantly improves the stability and reliability of online detection.

[0018] Employing a synchronously rotating dual-disc design, the symmetrical laser inspection heads scan continuously along a circular path. This design completely eliminates the back-and-forth motion associated with traditional Z-shaped scanning, significantly improving effective detection rates. Furthermore, the uniform circular motion eliminates mechanical vibration interference, and the annular inspection zone ensures the laser beam remains perpendicular to the film surface, completely eliminating cosine errors caused by non-orthogonal measurement. This achieves high accuracy with high efficiency.

[0019] The structural design of the annular detection area, combined with the modular rotating power transmission scheme, makes it very convenient and economical to arrange multiple groups of laser detection heads along the circumferential direction on the same rotating device. To increase the detection channels, only the corresponding laser head groups and their independent circuit channels need to be added on the circumference, without superimposing complex mechanical scanning mechanisms. The system complexity and cost increase are much lower than those of traditional multi-point or scanning schemes, achieving high-efficiency and low-cost multi-production line expansion capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional structure diagram of the present invention.

[0021] Figure 2 It is a schematic three-dimensional structure diagram of the present invention.

[0022] Figure 3 It is a front view of the present invention.

[0023] Figure 4 It is a schematic structural position diagram of the power lead-in end and the annular contact end.

[0024] Figure 5 It is a schematic structure of the air flow outlet Figure 1 。

[0025] Figure 6 It is a schematic structure of the air flow outlet Figure 2 。

[0026] In the figure: 1, central rotating shaft; 2, laser detection head; 3, detection turntable; 4, outer sleeve; 5, dynamic seal ring; 6, bearing seat; 7, bearing group; 8, cavity; 9, motor; 10, upper end cover; 11, columnar disc; 12, annular air path; 13, air flow outlet; 14, detection area; 15, first air path; 16, second air path; 17, third air path; 18, lead-out wire; 19, reserved channel; 20, first oil pipe; 21, second oil pipe; 22, insulating ring; 23, annular conductive track; 24, power lead-in end; 25, elastic dial; 26, film. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0028] Such as Figures 1 - 3As shown in the figure, in this embodiment, a detection device for laser film production includes a central rotating shaft 1, a synchronous rotating laser pair - shooting component, an intermediate component, and a motor 9. Specifically, the central rotating shaft 1 is the central rotating shaft body of the entire detection center. The inside of the shaft body is hollow, and the hollow area is arranged along the axial direction. This area can be used as a wiring channel 21 for the lead - out wire of the laser detection head 2. The synchronous rotating laser pair - shooting component is provided with two detection turntables 3 symmetrically and at intervals above and below the middle of the central rotating shaft 1. In other embodiments, the two detection turntables 3 can be arranged at the upper part of the central rotating shaft 1. Whether it is the upper part or the middle part of the central rotating shaft 1, the purpose is to elevate the two detection turntables 3 so that this component can rotate synchronously with the central rotating shaft 1, and at the same time, a mounting position for other components is reserved at the lower part of the central rotating shaft 1. The intermediate component has an outer sleeve 4. The upper end of the outer sleeve 4 forms a dynamic seal with the lower edge of the adjacent detection turntable 3 through a dynamic seal ring 5. The inside of the outer sleeve 4 has a bearing seat 6. A bearing group 7 that rotatably supports 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 group 7 in the outer sleeve 4. In this embodiment, angular contact ball bearings are used to support the rotational movement of the central rotating shaft 1, transmitting the radial load and axial load of the turntable component to the outer sleeve 4 to ensure that the concentricity error of the central rotating shaft 1 is ≤0.02 mm. The motor 9 is fixedly connected to the outer sleeve 4 through an upper end cover 10. Its shaft extension penetrates 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.

[0029] In this embodiment, the detection turntable 3 is a circular disk fixedly installed at two upper and lower positions of the central rotating shaft 1. The two detection turntables 3 are connected as a whole through a columnar disk 11 at the middle position between them. The central rotating shaft 1 passes through the center of the columnar disk 11. The columnar disk 11 has a cavity inside. The cavity is penetrated by the central rotating shaft 1 from the center to form an annular air path 12. Air outlets 13 are communicated with the circumferential side of the annular air path 12 and are arranged on the columnar disk 11. Air flows out from the annular air path 12 through the air outlets 13. The outlet direction of the air outlets 13 faces the detection area 14. The detection area 14 is the area for detecting the film thickness. The detection area 14 is arranged at intervals between the two detection turntables 3. A detection area 14 is formed within the vertical projection space between them. The effective space of this inspection area is an annular body formed after removing the space of the columnar disk 11. Multiple films are allowed to move in the detection area 14 along the direction parallel to the symmetry plane between the two detection turntables 3 for laser thickness measurement. For example Figure 5As shown in the figure, on the air supply side of the annular air passage, several intake passages are formed at the bottom side of the annular air passage 12 to communicate downward with the exhaust port of the motor 9 through the inside of the outer casing 4. The above intake passages include several first air passages 15 that are circumferentially evenly distributed around the central rotation shaft 1 and communicate below the annular air passage 12; several second air passages 16 that are circumferentially evenly distributed around the central rotation shaft 1 inside the outer casing 4, and several third air passages 17 formed on the upper end cover 10 of the motor 9; the first air passage 15, the second air passage 16, and the third air passage 17 are connected in sequence. Several second air passages 16 are annularly arranged around the bearing group 7 and the cavity 8 below it. The second air passages 16 annularly arranged around the bearing group 7 simultaneously form a heat dissipation air duct, which guides the waste heat air flow of the motor 9 to the annular air passage 12 while actively cooling the temperature rise of the bearing group 7 to prevent the change of the fit clearance caused by thermal expansion. The cooling air of the motor 9 is input into the annular air passage 12 through the intake passage. Therefore, the purpose of setting the annular air passage 12 is to form a gas collecting cavity at the position of the detection area 14, which is located in the middle and is annular, and can touch the detection area 14 360°, giving great flexibility to the opening position of the air flow outlet 13, and can be arbitrarily opened in a circumferential distribution according to the position of the diaphragm.

[0030] For example, in this embodiment, as Figure 5 shown, the air flow outlet 13 is horizontally oriented towards the direction where the laser detection head is located, and the purging air passage of the air flow outlet 13 is evenly divided up and down by the symmetry plane between the detection turntables 3. The advantage of this is that the upper and lower surfaces of the film 26 can be touched by using the independent air flow outlet 13, and this effect is also achieved by the favorable conditions formed by the annular air passage 12. Of course, multiple groups of air flow outlets 13 can also be evenly arranged in a circumferential distribution. On the end faces of the two detection turntables 3 that are close to each other, two groups of laser detection heads are axially aligned. Each group of laser detection heads initially aligns to detect one film 26, and as the detection turntable 3 rotates, the radius covers the full width of each film. The laser detection heads move in a circular motion with the turntable. The annular detection area 14 is coaxially fitted with the rotation trajectory of the laser detection head 2 to ensure that the scanning optical path is perpendicular to the film surface throughout the process, eliminating the thickness error caused by non-orthogonal measurement. The specific step method for the two films is to be arranged side by side on the left and right, distributed on both sides of the columnar disc 11, and the two films are arranged in a parallel position, that is, synchronous detection on the double production lines that support the films.

[0031] Note that for the data recognition and positioning problems in double-film detection, in practice, laser detection heads can be installed in groups on the end face of the turntable according to the film positions. Each group of laser detection heads independently corresponds to one film. The lead wires of the laser heads for each film are connected to the circular conductive tracks on the exclusive insulating ring on the outer circumference of the central rotating shaft. The elastic shifters at the lower power supply terminals contact the tracks in groups, outputting physically isolated electrical signal channels. The signal transmission has no crossovers, and the system directly determines the film position of the data source. By dynamically adjusting the partition angle through software, it can adapt to films of different widths and asymmetric layouts, achieving an accurate corresponding relationship between the laser detection heads and each side of the film. For example, at a rotational speed of 3000 rpm, the software controls the rotational speed and combines angle partitioning to achieve an effective detection time of 10 ms / rotation (in the 180° interval) for a group of laser detection heads at the initial position of each side of the film; the detectable point density is 500 points / m (when the film speed is 10 m / s). By controlling the rotational speed and angle partitioning trigger through the software solution, a dynamic one-to-one correspondence between the laser detection heads and each side of the film is achieved, while significantly simplifying the hardware structure.

[0032] Alternatively, an angle encoder can be integrated into the motor or the central rotating shaft to record the rotation angle of each laser detection head in real time, providing the instantaneous azimuth of the laser head on the circular trajectory. Synchronized with the film movement speed, the film production line speed sensor provides the film movement 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 based on the following parameters: the lateral position (width direction) is determined by the laser head rotation radius R and the angle θ, i.e., X = R×cosθ. The longitudinal position (length direction) is determined by the film movement speed v and the detection time t, i.e., Y = v×t. When the laser detection head detects an abnormal thickness at θ = 30° and the film has moved Y = 50 mm at the same time, the coordinates of the problem point are (X, Y). In case of a large area of abnormal thickness, the trigger controller threshold range is activated to start the shutdown mechanism.

[0033] For another example, in other embodiments, as Figure 6 shown, the air flow outlets 13 are multiple inclined channels offset up and down. The air flow outlets 13 symmetrically face the symmetry plane of the detection turntable 3. When the film running surface coincides with the symmetry plane, each group of air flow outlets 13 forms a blowing effect on both the upper and lower sides of the film running surface.

[0034] In this embodiment or other embodiments, due to the setting of the annular detection area 14, the possibility of simultaneously detecting multiple films is given. The annular detection area 14 is an annular space that unfolds 360° around the central axis 1. This annular structure itself provides a natural physical basis for arranging detection points at different angular positions. The laser detection head is installed on the end face of the detection turntable 3. It should be understood that since the detection turntable 3 is circular and its end face covers the entire range of the annular detection area 14, multiple laser detection head groups can be installed along different angles in the circumferential direction of the same detection turntable 3. The laser detection head moves in a circular motion with the turntable, forming an arc-shaped detection line. Compared with the zigzag detection line of traditional technologies, the circular motion is continuous and there is no acceleration, deceleration, or commutation pause time during the reciprocating motion. A larger area can be covered per unit time because the traditional method requires the laser head or mirror to perform reciprocating linear acceleration, deceleration, pause, and reverse motion in the X-axis (film width direction) or Y-axis (film length direction), forming a zigzag scanning path. The vibration generated by uniform rotation is much smaller than the linear motion with frequent start-stop and commutation, which also improves the system stability, measurement accuracy, and service life; at the same time, only one rotating motor 9 is needed to drive the central axis 1 / turntable to achieve the scanning motion, and the control algorithm is relatively simple, mainly speed control is required.

[0035] In this embodiment, as Figure 1 shown, the lead wire of the laser detection head 2 is set to be internally routed. The lead wire passes through the wire routing channel 21 and is connected to the annular contact end located on the outer periphery of the central axis 1 one by one; 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 axis 1 in sequence and then enters the wire routing channel 21 of the central axis 1 as Figure 4 shown. A plurality of insulating rings 22 are fixedly sleeved on the outer periphery of the central axis 1. An independent annular conductive track 23 is embedded on the outer surface of each insulating ring. The lead wire extends downward and is connected to the annular conductive track through the side wall of the central axis 1 at the corresponding position, or a contact point is formed in the wire routing channel 21 by connecting the annular conductive track; note that when the central axis 1 rotates, it drives the detection turntable 3, the laser detection head 2, and the lead wire 18 to rotate synchronously. In order to eliminate the cable winding caused by rotation, a power supply terminal 24 is installed in the cavity 8. The cavity 8 is located below the bearing group 7. The power supply terminal is located beside the annular contact end and is in contact connection with the annular conductive track 23 of the annular contact end through an elastic piece 25; the power supply terminal leads out elastic pieces corresponding to the number of annular conductive tracks. The elastic pieces are in contact connection with the annular conductive track and are wired outward from each power supply terminal to the outer casing 4 or outward through the motor 9 to form independent output channels. The setting of internal routing realizes zero exposure of dynamic power transmission of the rotating assembly and avoids scratching the film.

[0036] In other embodiments, there are two power leads disposed in the cavity 8. The contact heads of the elastic shims of the two power leads are in central symmetry and are in contact connection with the annular conductive track, which improves the expansion ability for the laser detection head.

[0037] Meanwhile, the present invention also discloses a working method of the detection device for laser film production: The working method includes a synchronous rotation type laser cross - thickness measurement method for double - path films, and a purging method for keeping the films clean based on the synchronous rotation type laser cross - thickness measurement method for double - path films; The synchronous rotation type laser cross - thickness measurement method for double - path films is that the motor 9 drives the central shaft 1 to drive the two detection turntables 3 to rotate synchronously, so that the upper and lower symmetric laser detection heads move synchronously along the circumferential trajectory. During the detection, several films can be reversely and uniformly passed through the detection area 14 along the symmetry plane of the overlapping detection turntable 3. The moving direction of the film is opposite to the rotation direction of the turntable, and 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 detecting a single film, on the premise that the rotation radius of the laser detection head covers the full width of the film, a continuous 360° and uniform rotation mode can be adopted; If detecting two films, on the premise that the rotation radius of the laser detection head covers the full width of the film, a non - continuous mode (180° rotation amplitude combined with the forward and reverse rotation of the motor) can be adopted, so that each group of laser detection heads only corresponds to the same film; Of course, it can also cooperate with the program control of the controller to increase the rotation speed and scanning distance in the defect area, etc., to realize various test methods for different test scenarios.

[0038] The purging method for keeping the films clean based on the synchronous rotation type laser cross - thickness measurement method for double - path films uses the hot exhaust gas generated during the operation of the motor 9 as the gas source of the purging air flow; The hot exhaust gas is discharged upward through several third air paths 17 opened on the upper end cover 10 of the motor 9, and then enters several circumferentially evenly distributed second air paths 16 in the outer sleeve 4 that are sequentially communicated with the third air paths 17. The air flow continues to move upward and passes through several first air paths 15 that are circumferentially evenly distributed with the central shaft 1 as the center and are located below the annular air path 12 and are sequentially communicated with the second air paths 16; After passing through the first air paths 15, the air flow enters the annular air path 12 formed by the internal cavity of the columnar disc 11 and the central shaft 1 passing through it for collection and distribution; The distributed air flow is ejected from the air flow outlet 13 provided on the circumferential side of the columnar disc 11. The air flow outlet 13 is configured such that the direction of the ejected purging air flow faces the detection area 14, and its flow path is evenly divided up and down by the symmetry plane between the detection turntables 3, forming a uniform, symmetric and film - width - covering purging air flow field on the upper and lower surfaces of the film and on the path passing through the detection area 14 to blow away dust debris and suppress static electricity.

[0039] The above embodiments are not intended to limit the present invention. Unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. The present invention is not limited to the above examples either. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the technical solutions of the present invention also fall within the protection scope of the present invention. In addition, the technical features involved in 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 detection device for laser film production, characterized in that, Comprising: A central rotating shaft having a wire routing channel arranged axially. A synchronous rotation type laser opposed component, with two detection turntables symmetrically and spaced up and down in the middle or upper part of the central rotating shaft. A detection area is formed in the vertical projection space between the two detection turntables; within the detection area, at least two films are allowed to move along a direction parallel to the symmetry plane between the two detection turntables for laser thickness measurement; on the end faces of the two detection turntables close to each other, at least two groups of laser detection heads are axially aligned. Each group of laser detection heads detects one film, and with the rotation radius of the detection turntable, it covers at least half of the width of each film; the lead wires of the laser detection heads penetrate into the wire routing channel, and the lead wires are connected one by one to the annular contact ends located on the outer periphery of the central rotating shaft. An intermediate component having an outer sleeve. In the bearing seat hole of the outer sleeve, a bearing group is rotatably supported at the lower part of the central rotating shaft. A cavity is opened below the bearing group within the outer sleeve, and an electrical connection end is installed in the cavity. The electrical connection end is located beside the annular contact end and is in contact connection with the annular contact end through an elastic flap. A motor, fixedly connected to the outer sleeve through an upper end cover, and its shaft extension end penetrates into the outer sleeve and is coaxially connected to the central rotating shaft.

2. The inspection device for laser film production according to claim 1, characterized in that: The two detection turntables are connected as a whole through a columnar disc. The cavity inside the columnar disc is penetrated by the central rotating shaft from the center position to form an annular air path; the circumferential side of the annular air path is communicated with an air flow outlet provided on the columnar disc, and the outlet direction of the air flow outlet faces the detection area; the bottom side of the annular air path is communicated with the exhaust port of the motor through a plurality of intake passages jointly formed within the outer sleeve.

3. The detection device for laser film production according to claim 2, characterized in that: The air flow outlet is horizontally oriented towards the direction where the laser detection heads are located, and the purge air path of the air flow outlet is evenly divided up and down by the symmetry plane between the detection turntables.

4. The inspection device for laser film production according to claim 2, wherein: The air flow outlet is a plurality of inclined flow channels offset up and down, and the air flow outlets are symmetrically oriented towards the symmetry plane of the detection turntable.

5. The inspection device for laser film production according to claim 2, characterized in that: The intake passage includes a plurality of first air paths 15 circumferentially distributed with the central rotating shaft as the center and communicated in the lower position of the annular air path; a plurality of second air paths circumferentially distributed with the central rotating shaft as the center within the outer sleeve, and a plurality of third air paths opened on the upper end cover of the motor; the first air path, the second air path, and the third air path are aligned and communicated.

6. The detecting device for laser film production according to claim 5, wherein: A plurality of the second air paths are annularly distributed around the bearing group and the cavity below it.

7. The detection device for laser film production according to claim 1, wherein: The lead wires of the laser heads sequentially penetrate into the wire routing channel through the reserved channels of the detection turntables and the reserved holes of the central rotating shaft; a plurality of insulating rings are fixedly sleeved on the outer periphery of the central rotating shaft. The outer surface of each insulating ring is inlaid with an independent annular conductive track, and the lead wires extend downward and are connected to the contacts of the annular conductive track within the wire routing channel; the electrical connection end leads out elastic flaps corresponding to the number of annular conductive tracks. The elastic flaps are in contact connection with the annular conductive tracks and are wired outward from each electrical connection end to the outside of the outer sleeve or through the motor.

8. The inspection device for laser film production according to claim 7, characterized in that: Two electrical connection ends are provided in the cavity, and the contact heads of the elastic flaps of the two electrical connection ends are in central symmetry contact connection with the annular conductive tracks.

9. The detecting device for laser film production according to claim 8, wherein: The lower end of the outer sleeve is fixedly connected to the upper end cover of the motor through a flange; the upper end of the outer sleeve forms a dynamic seal with the lower edge of the adjacent detection turntable through a dynamic seal ring.

10. The working method of the detection device for laser film production according to any one of claims 1 - 9, characterized in that: The working method includes a synchronous rotation laser beam thickness measurement method for a dual-pass film, and a blowing method for keeping the film clean based on the synchronous rotation laser beam thickness measurement method for the dual-pass film. The synchronous rotation laser beam thickness measurement method for dual-path films is to use a motor to drive the central rotating shaft to drive the two detection turntables to rotate synchronously, so that the upper and lower symmetrical laser detection heads move synchronously along a circular trajectory. During the detection period, several films can be passed through the detection area in opposite directions at a uniform speed along the symmetry planes of the overlapping detection turntables. The rotation radius of the laser detection head covers the full width or half the width of the film. The purge method for keeping the film clean based on the synchronous rotation laser beam thickness measurement method for the dual-path film utilizes the hot exhaust gas generated during the operation of the motor as the air source of the purge airflow; The hot exhaust is discharged upward through several third air paths opened on the upper end cover of the motor, and then enters several circumferentially evenly distributed second air paths in the outer sleeve which is connected to the third air paths in a positional manner. The airflow continues to upward through several circumferentially evenly distributed first air paths which are connected to the second air paths and are located below the annular air path with the central axis as the center. After the airflow passes through the first air path, it enters the annular air path formed by the internal cavity of the cylindrical disc and the central axis running through it for collection and distribution. The distributed airflow is ejected through the airflow outlet arranged on the circumferential side of the cylindrical disc. The airflow outlet is constructed so that the direction of the purge airflow it ejects faces the detection area. Its flow path is evenly divided up and down by the symmetry plane 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 debris and suppress static electricity.

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