Device for improving coating precision and uniformity

Abstract

The utility model relates to the technical field of coating, in particular to a device for improving coating precision and uniformity. Comprising a positioning calibration module, a coating module and a detection feedback module, the detection feedback module scans and monitors the surface of a thin film on the whole coating substrate and feeds back data to the structure and the starting method of the PLC controller in real time according to the thickness of the thin film, so that data interconnection among the positioning calibration module and the coating module is achieved through a detection feedback scheme of the device for improving the coating precision and uniformity; a set of circulating system is formed, finally, high stability and automatic production of the tool bit are achieved through self-adjustment, coating of other types of linear planes except a plane substrate can be achieved, the using scene is not limited by most substrates, and then a battery module of a tile structure is manufactured. And the method has the effects of extremely high commercial value and technical value.

Description

Technical Field

[0001] The utility model relates to the technical field of coating, in particular to a device for improving coating accuracy and uniformity. Background Art

[0002] Perovskite cells, a representative of emerging solar photovoltaic cells, have garnered widespread attention in recent years. A wide variety of methods and equipment are currently available for preparing perovskite thin films. The perovskite light-absorbing layer, the core film layer of a perovskite solar cell, is crucially affected by its preparation process, ultimately determining its performance. However, the progress of perovskite solar cells from laboratory research to large-scale practical application presents numerous challenges. In particular, the ability to uniformly coat the perovskite solution onto the cell substrate and form a consistent dry film is a key technical bottleneck for the industrialization of perovskite cells.

[0003] Spin coating is the most common method used in laboratories. However, its inherent characteristics limit the coating area. The emergence of slit coating and blade coating can effectively solve this problem. However, in actual application, due to the bulky blade and the unreasonable design of the support structure, the instability of the coating is increasing. Specifically, on the same machine, for products in the same production cycle, the uniformity of the film coated earlier is 1% to 3% higher than that of the film coated later, resulting in a sharp drop in the yield of the final product.

[0004] Or because traditional coating machines can only mechanically move in the X-axis direction according to a set height, and cannot adjust the height of the blade in real time, it is limited to being unable to coat straight surface types such as twisted planes, twisted cones, and twisted cylinders, and the application scenarios of the machine are greatly restricted.

[0005] Furthermore, since the viscosity of perovskite solution is lower than that of lithium battery solution, the precision requirements of coating equipment are very high. Therefore, how to ensure the consistency and stability of the gap between the lip of the blade and the coated substrate during each coating is one of the technical bottlenecks that need to be solved urgently on the road to commercialization of perovskite photovoltaic cells. Utility Model Content

[0006] The purpose of the present utility model is to provide a device for improving coating accuracy and uniformity in response to the defects in the prior art, so as to achieve data interconnection between the positioning calibration module and the coating module through the detection feedback scheme of the device for improving coating accuracy and uniformity, thereby forming a circulation system, and ultimately achieving high stability and automated production of the cutter head through self-adjustment, and can also achieve coating of other types of linear planes in addition to flat substrates, and the usage scenarios are not restricted by most substrates, thereby making a tile-structured battery module with extremely high commercial and technical value.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a device for improving coating accuracy and uniformity, comprising a positioning calibration module, a coating module and a detection feedback module;

[0008] The positioning calibration module includes a coaxial displacement meter, which is provided with a sensor probe, a controller, an optical unit and a support frame;

[0009] The coating module includes a gantry bracket, a coating platform, a coating knife head, a liquid injection controller, a PLC controller, moving parts and guide rails;

[0010] The sensor probes are respectively provided at the coating starting end position of the upper platform of the coating module and at the other side position opposite to the coating blade;

[0011] The optical unit is connected to the PLC controller of the coating module via a signal;

[0012] The detection feedback module includes a fixed support frame and a film thickness measuring instrument. The film thickness measuring instrument scans and monitors the surface of the film on the entire coating substrate and feeds back data to the PLC controller in real time according to the film thickness.

[0013] Furthermore, the reference range distance of the coaxial displacement meter is set in the range of 0 to 200 mm, the standard range distance of the coaxial displacement meter is set in the range of 0 to 300 mm, the high-precision range distance of the coaxial displacement meter is set in the range of 0 to 250 mm, the spot diameter of the coaxial displacement meter is set in the range of 0 to 1000 μm, the sampling period of the coaxial displacement meter is set in the range of 10ns to 2ms, and the coaxial displacement meter adopts three scanning methods: point, line, and surface.

[0014] Furthermore, the sensor probes installed on the side of the coating module platform are arranged in a straight line. The number of sensor probes at this position is determined according to the actual length of the cutter head, the number is N (N≥2), and the interval between each two probes is in the range of 1cm to 360cm; the sensor probes installed on the other side opposite to the coating cutter head are arranged in a U-shaped arrangement, which is distributed at the front end of the cutter head in the coating direction and on both sides close to the gantry. The number of sensor probes at this position is determined according to the actual length of the cutter head, the number is N (N≥2), and the interval between each two probes is in the range of 1cm to 360cm.

[0015] Furthermore, the communication mode of the PLC controller includes serial communication, parallel communication, network communication, wireless communication and optical fiber communication, alone or in combination of two or more thereof;

[0016] The types of guide rails include air-floating guide rails, linear sliding guide rails, rolling guide rails, hydrostatic guide rails, curved guide rails and magnetic guide rails, one of which is used alone or in combination of two or more;

[0017] The moving parts include servos, steppers, synchronous belts, belts, sprockets, racks and pinions, worm gears, pulleys, lead screws and electric cylinders, either alone or in combination of two or more;

[0018] The coating blade includes a slit coating blade, an ultrasonic nozzle, a two-fluid nozzle and a scraper blade, one alone or a combination of two or more.

[0019] The main material of the coating platform is marble, ceramic, POM, PTFE, ABS, PVC, polyurethane, rubber, bakelite, plastic, stainless steel, carbon steel, alloy, one alone or a combination of two or more;

[0020] The coating substrate is U-shaped, V-shaped, wavy, continuous V-shaped, irregular arc, hyperbolic paraboloid, conical surface, cylindrical surface, oblique spiral surface, twisted plane, twisted cone surface, twisted cylindrical surface and plane shape, alone or in combination of two or more thereof.

[0021] Furthermore, the reference range distance of the film thickness measuring instrument is in the range of 0 to 350 mm, the standard range distance of the film thickness measuring instrument is in the range of 0 to 360 mm, the spot diameter of the film thickness measuring instrument is in the range of 0 to 1000 μm, and the number of the sensor probes at this position is N (N≥1), and they are installed at the back end of the coating direction of the coating head.

[0022] Furthermore, the coating platform is fixed on the machine table, with the guide rails installed on both sides thereof, and the gantry bracket is connected to the guide rails by the moving parts to control its X-axis movement; two moving parts are respectively installed on the columns on both sides of the gantry bracket in the Z-axis direction, and the coating knife head is connected to the two moving parts in the Z-axis direction by a moving seat, so that the up and down movement of the coating knife head can be accurately controlled;

[0023] A row of sensor probes of the coaxial displacement meter is fixed in front of the coating blade on one side in the coating direction, and the light source height is not lower than the horizontal plane of the lowest lip of the coating blade. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe at this position and the coating platform;

[0024] Another row of sensor probes of the coaxial displacement meter is fixed on the side wall of the coating platform near the coating front end, and the height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head, so as to detect the absolute distance between the sensor probe at this position and the lip.

[0025] Furthermore, the gantry bracket is fixed on the machine platform, the guide rail is installed under the coating platform, and the guide rail is connected to the guide rail by the moving component to control the X-axis movement of the coating platform; two moving components are respectively installed on the columns on both sides of the gantry bracket in the Z-axis direction, and the coating knife head is connected to the two moving components in the Z-axis direction by a moving seat, so that the up and down movement of the coating knife head can be accurately controlled;

[0026] A row of sensor probes of the coaxial displacement meter is fixed in front of the coating blade on one side in the coating direction, and the light source height is not lower than the horizontal plane of the lowest lip of the coating blade. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe at this position and the coating platform;

[0027] Another row of sensor probes of the coaxial displacement meter is fixed on the side wall of the coating platform near the coating front end, and the height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head, so as to detect the absolute distance between the sensor probe at this position and the lip.

[0028] The invention comprises a positioning and calibration module, a coating module, and a detection and feedback module; the positioning and calibration module includes a coaxial displacement meter, which is equipped with a sensor probe, a controller, an optical unit, and a support frame; the coating module includes a gantry support, a coating platform, a coating blade, an injection controller, a PLC controller, moving parts, and a guide rail; the sensor probe is respectively provided at the coating start end of the coating platform on the coating module and at a position on the other side opposite the coating blade; the optical unit is connected to the PLC controller of the coating module via a signal; the detection and feedback module includes a fixed support frame and a film thickness gauge, which scans and monitors the surface of the film on the entire coated substrate and provides real-time feedback data to the PLC controller based on the film thickness. The device achieves a detection and feedback scheme that improves coating accuracy and uniformity, connects the data between the positioning and calibration modules, and forms a circulation system. Ultimately, high stability and automated production of the blade are achieved through self-adjustment. In addition, coating of linear surfaces other than flat substrates can be achieved. The application scenario is not limited to most substrates, and a tile-structured battery module is then produced, which has extremely high commercial and technical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A top view of a device for improving coating accuracy and uniformity provided by the utility model;

[0031] Figure 2 This is a front view of a device for improving coating accuracy and uniformity provided by the utility model;

[0032] Figure 3 A schematic diagram of a device for improving coating accuracy and uniformity provided by the present invention coating a wavy surface;

[0033] Reference numerals:

[0034] Sensor probe 1 of coaxial displacement meter, coating platform 2, coating knife head 3, guide rail 4, gantry bracket 5, film thickness measuring instrument 6, coating substrate 7. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] A device for improving coating accuracy and uniformity, such as Figure 1 、 23, it includes a positioning and calibration module, a coating module and a detection and feedback module; the positioning and calibration module includes a coaxial displacement meter, which is provided with a sensor probe 1, a controller, an optical unit and a support frame; the coating module includes a gantry bracket 5, a coating platform 2, a coating head 3, an injection controller, a PLC controller, a moving part and a guide rail 4; the sensor probe 1 is respectively provided on the coating starting end position of the platform on the coating module and on the other side opposite to the coating head 3; the optical unit is connected to the PLC controller of the coating module through a signal; the detection and feedback module includes a fixed support frame and a film thickness measuring instrument 6, which scans and monitors the surface of the thin film on the entire coating substrate 7 and feeds back data to the PLC controller in real time according to the film thickness.

[0038] Specifically, through the precise measurement of the coaxial displacement meter and the sensor probe 1, the relative position between the coating blade 3 and the coating substrate 7 can be calibrated in real time to ensure that the gap between the blade lip and the substrate remains highly consistent and stable each time coating is applied. This solves the problem of uneven coating caused by the non-adjustable or inaccurate blade height of traditional coating machines, significantly improves coating accuracy, reduces uneven film thickness caused by position deviation, and thus improves the overall quality and yield of the product. The integrated coating module design accurately controls the movement of the moving parts along the guide rail 4 through the PLC controller, combined with the precise injection of the injection controller, realizes the automation and intelligence of the coating process. At the same time, the coating blade Sensor probes 1 are provided on both sides of the head 3, further enhancing the accuracy of position calibration, improving coating efficiency, reducing manual intervention, and ensuring the stability and repeatability of the coating process, making it possible to produce large-area, high-efficiency perovskite cells. The film thickness measuring instrument 6 can scan and monitor the film surface on the entire coated substrate 7 in real time, and feed back the film thickness data to the PLC controller in real time. The closed-loop feedback mechanism enables the system to adjust the coating parameters in time according to the actual coating effect, achieving dynamic optimization, greatly improving the controllability and flexibility of the coating process, and being able to promptly discover and resolve potential problems during the production process, ensuring the quality and consistency of the final product. In addition, this real-time feedback mechanism also helps to improve production efficiency and resource utilization, and reduce production costs.

[0039] As a preferred embodiment of the above, Figure 2 As shown, the reference range distance of the coaxial displacement meter is set in the range of 0 to 200 mm, the standard range distance of the coaxial displacement meter is set in the range of 0 to 300 mm, the high-precision range distance of the coaxial displacement meter is set in the range of 0 to 250 mm, the spot diameter of the coaxial displacement meter is set in the range of 0 to 1000 μm, the sampling period of the coaxial displacement meter is set in the range of 10ns to 2ms, and the coaxial displacement meter adopts three scanning methods: point, line and surface.

[0040] Specifically, the upper limit of the measurement distance of the coaxial displacement meter in the reference mode is set by the reference range distance. Taking into account the relative position change between the blade and the substrate during the coating process, this range should be sufficient to cover the maximum distance change that may occur in actual operation, while ensuring the accuracy of the measurement. The standard range distance provides a larger measurement space to accommodate coating substrates of different sizes and shapes, as well as more complex coating process requirements. The setting of the high-precision range distance emphasizes the importance of measurement accuracy. Within this range, the coaxial displacement meter should be able to provide more precise and accurate measurement results to meet the application scenarios with extremely high requirements for coating accuracy. By narrowing the range and optimizing the measurement algorithm, higher measurement accuracy can be achieved. The spot diameter range takes into account both measurement accuracy and precision. The sampling period takes into account higher time resolution, the system can respond to changes in the coating process more quickly, and adjust coating parameters in real time. The coaxial displacement meter uses three scanning methods: point, line, and surface, providing flexible and diverse measurement options. Point scanning is suitable for precise measurement of specific positions; line scanning can continuously measure along a specific path, which is suitable for detecting the uniformity and consistency of coating lines; surface scanning can perform comprehensive inspection of the entire coating area to evaluate the overall quality and uniformity of the coating. Different scanning methods can be selected or used in combination according to actual needs to meet different measurement needs.

[0041] As a preferred embodiment of the above, Figure 2 As shown, the sensor probes 1 installed on the side of the coating module platform are arranged in a straight line. The number of the sensor probes 1 at this position is determined according to the actual length of the cutter head, and the number is N (N≥2). The interval between each two probes is in the range of 1cm to 360cm; installed on the other side opposite to the coating cutter head 3, the sensor probes 1 are arranged in a U-shaped arrangement, which are distributed at the front end of the cutter head coating direction and on both sides close to the gantry. The number of the sensor probes 1 at this position is determined according to the actual length of the cutter head, and the number is N (N≥2). The interval between each two probes is in the range of 1cm to 360cm.

[0042] Specifically, the number of probes is determined according to the actual length of the blade, which is recorded as N (N≥2). The interval between each two probes ranges from 1cm to 360cm, which achieves effective coverage of the entire blade length while ensuring the precision and real-time performance of monitoring. The U-shaped arrangement uses space to distribute the sensor probes at the front end of the blade coating direction and on both sides close to the gantry. The front probe can monitor the substrate status before coating begins in real time, while the probes on both sides can monitor the edge effect and coating uniformity during the coating process. The number and interval are also determined according to the actual length of the blade, which is recorded as N (N≥2). The interval between each two probes ranges from 1cm to 360cm. Combined with the U-shaped arrangement design, the probes can cover multiple key positions in the coating process, thereby providing more comprehensive monitoring data. Through reasonable probe arrangement and quantity setting, all-round and high-precision monitoring of the coating process can be achieved. By further optimizing the coating process, problems such as uneven coating and edge effects can be reduced, thereby improving the quality and consistency of the final product. It can also adapt to blades of different lengths and shapes, as well as coating substrates of different materials and thicknesses, and has strong versatility and adaptability.

[0043] As a preferred embodiment of the above, Figure 3 As shown, the communication mode of the PLC controller includes serial communication, parallel communication, network communication, wireless communication and optical fiber communication, alone or in combination of two or more thereof;

[0044] The types of the guide rails 4 include air-floating guide rails 4, linear sliding guide rails 4, rolling guide rails 4, static pressure guide rails 4, curved guide rails 4 and magnetic guide rails 4, one alone or a combination of two or more thereof;

[0045] The moving parts include servos, steppers, synchronous belts, belts, sprockets, racks and pinions, worm gears, pulleys, lead screws and electric cylinders, either alone or in combination of two or more;

[0046] The coating blade 3 includes a slit coating blade 3, an ultrasonic nozzle, a two-fluid nozzle and a scraper blade, one alone or a combination of two or more;

[0047] The coating platform 2 is mainly made of marble, ceramic, POM, PTFE, ABS, PVC, polyurethane, rubber, bakelite, plastic, stainless steel, carbon steel, alloy, or a combination of two or more thereof;

[0048] The coating substrate 7 is U-shaped, V-shaped, wavy, continuous V-shaped, irregular arc, hyperbolic paraboloid, conical surface, cylindrical surface, oblique spiral surface, twisted plane, twisted cone surface, twisted cylindrical surface and plane shape, alone or in combination of two or more thereof.

[0049] As a preferred embodiment of the above, Figure 1As shown, the reference range distance of the film thickness measuring instrument 6 is in the range of 0 to 350 mm, the standard range distance of the film thickness measuring instrument 6 is in the range of 0 to 360 mm, the spot diameter of the film thickness measuring instrument 6 is in the range of 0 to 1000 μm, and the number of the sensor probes 1 at this position is N (N≥1), and they are installed at the back end of the coating direction of the coating head 3.

[0050] Specifically, the sensor probe 1 is installed at the back end of the coating direction of the coating head 3, allowing the sensor probe to monitor the coating results immediately after the coating process is completed. The system can obtain the thickness data of the coated film in real time and adjust or optimize it as needed. The number of sensor probes is determined according to actual needs, but there should be at least one to ensure basic monitoring functions. In cases where higher precision or more detailed monitoring is required, the number of probes can be increased to provide more comprehensive data support. The combined use of the sensor probe 1 and the film thickness measuring instrument 6 provides real-time feedback on the coating results, allowing the system to adjust the coating parameters in time to optimize the coating effect.

[0051] As a preferred embodiment of the above, Figure 2 As shown, the coating platform 2 is fixed on the machine table, and the guide rails 4 are installed on both sides thereof. The gantry bracket 5 is connected to the guide rails 4 by the moving parts to control its X-axis movement; two moving parts are respectively installed on the columns on both sides of the gantry bracket 5 in the Z-axis direction, and the coating knife head 3 is connected to the two moving parts in the Z-axis direction by a moving seat, so that the coating knife head 3 can be accurately controlled to move up and down;

[0052] A row of sensor probes 1 of the coaxial displacement meter are fixed in front of the coating blade 3 on one side of the coating direction, and the light source height is not lower than the horizontal plane of the lowermost lip of the coating blade 3. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe 1 at this position and the coating platform 2;

[0053] Another row of the sensor probes 1 of the coaxial displacement meter is fixed on the side wall of the coating platform 2 near the coating front end. The height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head 3, so as to detect the absolute distance between the sensor probe 1 at this position and the lip.

[0054] Specifically, the sensor probe 1 on the front side of the coating direction is fixed on the front side of the coating head 3 in the coating direction, and the height of its light source is not lower than the horizontal plane of the lowest lip of the coating head 3, ensuring that the sensor probe can accurately measure the absolute distance between the coating head and the coating platform, providing data support for the precise control of the coating thickness, and the light irradiation direction is vertically horizontal and downward and aimed at the coating platform. This vertical irradiation method helps to reduce measurement errors and improve measurement accuracy. The sensor probe 1 on the side wall of the coating platform near the coating front end is fixed on the side wall of the coating platform 2 near the coating front end, and the height of its light source is not higher than the horizontal plane of the upper surface of the platform. This arrangement enables the sensor probe to accurately measure the absolute distance between the lip of the coating head and it, providing data support for the position calibration of the coating head. The light irradiation direction is vertically horizontal and upward and aimed at the lip of the coating head. This upward irradiation method helps to capture subtle changes in the lip and improve the accuracy of position calibration.

[0055] As a preferred embodiment of the above, Figure 2 As shown, the gantry bracket 5 is fixed on the machine platform, the guide rail 4 is installed under the coating platform 2, and the guide rail 4 is connected to the guide rail 4 by the moving component to control the X-axis movement of the coating platform 2; two moving components are respectively installed on the columns on both sides of the gantry bracket 5 in the Z-axis direction, and the coating knife head 3 is connected to the two moving components in the Z-axis direction by a moving seat, so that the coating knife head 3 can be accurately controlled to move up and down;

[0056] A row of sensor probes 1 of the coaxial displacement meter are fixed in front of the coating blade 3 on one side of the coating direction, and the light source height is not lower than the horizontal plane of the lowermost lip of the coating blade 3. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe 1 at this position and the coating platform 2;

[0057] Another row of sensor probes 1 of the coaxial displacement meter is fixed on the side wall of the coating platform 2 near the coating front end. The height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head 3, so as to detect the absolute distance between the sensor probe 1 at this position and the lip.

[0058] Specifically, by connecting the moving seat with two moving parts in the Z-axis direction, precise movement in the vertical direction can be achieved. This design enables the coating knife head to adjust its height and angle according to the coating requirements to achieve the best coating effect. The sensor probe in front of one side of the coating direction is fixed in front of the coating knife head 3, and the height of its light source is not lower than the horizontal plane of the lowest lip of the knife head. These probes irradiate light in a vertical horizontal downward manner, aimed at the coating platform, and are used to detect the absolute distance between the probe and the coating platform. This is very important for monitoring the coating thickness and uniformity. The sensor probe on the side wall of the coating platform close to the coating front end is fixed on the platform, and the height of its light source is not higher than the horizontal plane of the upper surface of the platform. These probes irradiate light in a vertical horizontal upward manner, aimed at the lip of the coating knife head. They are used to detect the absolute distance between the probe and the lip of the knife head, which helps to calibrate the position and angle of the knife head.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A device for improving coating accuracy and uniformity, characterized in that: It includes positioning calibration module, coating module and detection feedback module; The positioning calibration module includes a coaxial displacement meter, which is provided with a sensor probe, a controller, an optical unit and a support frame; The coating module includes a gantry bracket, a coating platform, a coating knife head, a liquid injection controller, a PLC controller, moving parts and guide rails; The sensor probes are respectively provided at the coating starting end position of the upper platform of the coating module and at the other side position opposite to the coating blade; The optical unit is connected to the PLC controller of the coating module via a signal; The detection feedback module includes a fixed support frame and a film thickness measuring instrument. The film thickness measuring instrument scans and monitors the surface of the film on the entire coating substrate and feeds back data to the PLC controller in real time according to the film thickness.

2. The device for improving coating accuracy and uniformity according to claim 1, characterized in that: The reference range distance of the coaxial displacement meter is set in the range of 0 to 200 mm, the standard range distance of the coaxial displacement meter is set in the range of 0 to 300 mm, the high-precision range distance of the coaxial displacement meter is set in the range of 0 to 250 mm, the spot diameter of the coaxial displacement meter is set in the range of 0 to 1000 μm, the sampling period of the coaxial displacement meter is set in the range of 10ns to 2ms, and the coaxial displacement meter adopts three scanning methods: point, line and surface.

3. The device for improving coating accuracy and uniformity according to claim 2, characterized in that: The sensor probes installed on the side of the coating module platform are arranged in a straight line. The number of sensor probes at this position is determined according to the actual length of the cutter head, and the number is N (N≥2). The interval between each two probes is in the range of 1cm to 360cm; the sensor probes installed on the other side opposite to the coating cutter head are arranged in a U-shaped arrangement, which is distributed at the front end of the cutter head in the coating direction and on both sides close to the gantry. The number of sensor probes at this position is determined according to the actual length of the cutter head, and the number is N (N≥2). The interval between each two probes is in the range of 1cm to 360cm.

4. The device for improving coating accuracy and uniformity according to claim 1, characterized in that: The communication mode of the PLC controller includes serial communication, parallel communication, network communication, wireless communication and optical fiber communication, alone or in combination of two or more thereof; The types of guide rails include air-floating guide rails, linear sliding guide rails, rolling guide rails, hydrostatic guide rails, curved guide rails and magnetic guide rails, one of which is used alone or in combination of two or more; The moving parts include servos, steppers, synchronous belts, belts, sprockets, racks and pinions, worm gears, pulleys, lead screws and electric cylinders, either alone or in combination of two or more; The coating blade includes a slit coating blade, an ultrasonic nozzle, a two-fluid nozzle and a scraper blade, one alone or a combination of two or more. The main material of the coating platform is marble, ceramic, POM, PTFE, ABS, PVC, polyurethane, rubber, bakelite, plastic, stainless steel, carbon steel, alloy, one alone or a combination of two or more; The coating substrate is U-shaped, V-shaped, wavy, continuous V-shaped, irregular arc, hyperbolic paraboloid, conical surface, cylindrical surface, oblique spiral surface, twisted plane, twisted cone surface, twisted cylindrical surface and plane shape, alone or in combination of two or more thereof.

5. The device for improving coating accuracy and uniformity according to claim 1, characterized in that: The reference range distance of the film thickness measuring instrument is within the range of 0 to 350 mm, the standard range distance of the film thickness measuring instrument is within the range of 0 to 360 mm, the spot diameter of the film thickness measuring instrument is within the range of 0 to 1000 μm, the number of the sensor probes at this position is N (N≥1), and they are installed at the back end of the coating direction of the coating head.

6. The device for improving coating accuracy and uniformity according to claim 1, characterized in that: The coating platform is fixed on the machine table, with the guide rails installed on both sides thereof. The gantry bracket is connected to the guide rails by the moving components to control its X-axis movement. Two moving components are respectively installed on the columns on both sides of the gantry bracket in the Z-axis direction. The coating knife head is connected to the two moving components in the Z-axis direction by a moving seat, so that the up and down movement of the coating knife head can be accurately controlled. A row of sensor probes of the coaxial displacement meter is fixed in front of the coating blade on one side in the coating direction, and the light source height is not lower than the horizontal plane of the lowest lip of the coating blade. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe at this position and the coating platform; Another row of sensor probes of the coaxial displacement meter is fixed on the side wall of the coating platform near the coating front end, and the height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head, so as to detect the absolute distance between the sensor probe at this position and the lip.

7. The device for improving coating accuracy and uniformity according to claim 1, characterized in that: The gantry bracket is fixed on the machine platform, and the guide rail is installed under the coating platform, and the guide rail is connected to the guide rail by the moving component to control the X-axis movement of the coating platform; two moving components are respectively installed on the two side columns along the Z-axis direction of the gantry bracket, and the coating knife head is connected to the two Z-axis moving components by a moving seat, so that the up and down movement of the coating knife head can be accurately controlled; A row of sensor probes of the coaxial displacement meter is fixed in front of the coating blade on one side in the coating direction, and the light source height is not lower than the horizontal plane of the lowest lip of the coating blade. The light irradiation direction is vertically downward and aimed at the coating platform to detect the absolute distance between the sensor probe at this position and the coating platform; Another row of sensor probes of the coaxial displacement meter is fixed on the side wall of the coating platform near the coating front end, and the height of the light source is not higher than the horizontal plane of the upper surface of the platform. The direction of light irradiation is vertically upward and aimed at the lip of the coating head, so as to detect the absolute distance between the sensor probe at this position and the lip.

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