Method, device and equipment for synchronously measuring surface density and medium

Abstract

The invention discloses an areal density synchronous measurement method, device and equipment and a medium, and the areal density synchronous measurement method comprises the steps: obtaining a belt running length L1 between a first areal density instrument and a second areal density instrument during synchronous operation; obtaining the tape walking length L2 between the first surface density instrument and the second surface density instrument during actual operation; the compensation value L of the second surface density instrument is determined according to the L1 and the L2, and L = (L1-L2) / 2. In the actual measurement process, the second surface density instrument is compensated through the compensation value L, so that the scanning tracks of the first surface density instrument and the second surface density instrument coincide, and the surface density of the coating can be accurately calculated.

Description

Technical Field

[0001] The present application relates to the technical field of surface density measurement, and in particular to a method, device, equipment and medium for synchronous surface density measurement. Background Art

[0002] In the lithium battery production process, the surface density of single-sided and double-sided coatings of dry film lithium battery pole pieces is mainly measured by two surface density meters to measure the surface density of substrate, single-sided pole piece (substrate + A-side coating), and double-sided pole piece (substrate + A and B-side coatings) respectively; The two surface density meters in the related art have poor synchronization during use, which affects the accuracy of coating surface density detection. Summary of the invention

[0003] In view of the above problems, the present application provides a method, device, equipment and medium for synchronous measurement of surface density, which can solve the problem of poor synchronization between two surface density meters during use.

[0004] In order to solve the above technical problems, in the first aspect, the present application proposes a method for synchronously measuring surface density, which comprises: Get the tape length L1 between the No. 1 area density meter and the No. 2 area density meter during synchronous operation; Obtain the tape running length L2 between the No. 1 areal density meter and the No. 2 areal density meter during actual operation, which includes: Detecting the coating starting position of the first coating mechanism by means of a first color mark sensor; Detecting the coating starting position of the second coating mechanism by means of a second color mark sensor; Correcting the position of the second color mark sensor by means of a correction mechanism so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; Obtaining the tape running length L2 according to the position of the second color mark sensor after deviation correction and the position of the first color mark sensor; The compensation value △L of the No. 2 surface density meter is determined based on L1 and L2, where △L=(L1-L2) / 2.

[0005] In the technical solution of the embodiment of the present application, the No. 2 surface density meter is compensated by the compensation value △L so that the scanning trajectories of the No. 1 surface density meter and the No. 2 surface density meter overlap, thereby ensuring that the No. 1 surface density meter and the No. 2 surface density meter detect the same position, and the surface density of the coating can be accurately calculated based on the difference between the No. 2 surface density meter and the No. 1 surface density meter.

[0006] In some embodiments, after determining the compensation value ΔL of the second areal density meter according to L1 and L2, the method further includes: Determine the size of △L and threshold value L3. Under the condition of △L>L3, the No. 2 surface density meter does not make compensation; under the condition of △L≤L3, the No. 2 surface density meter makes compensation. In this way, it can avoid the synchronous scanning of multiple measuring instruments and the error compensation in the process of the tape distance calibration between multiple frames.

[0007] In some embodiments, the method for synchronously measuring surface density further includes an alarm system; Under the condition of ΔL>L3, the alarm system will sound an alarm, so that the staff can be effectively reminded to operate in time.

[0008] In some embodiments, the detecting the coating starting position of the first coating mechanism by the first color mark sensor includes: Determine whether the signal detected by the first color mark sensor is continuous within a preset time period; if so, determine the coating start position of the first coating mechanism; if not, determine the coating start position of the first coating mechanism after the first color mark sensor detects a continuous signal. In this way, discontinuous coating and line break can be avoided. If the detection signal of the first color mark sensor is intermittent, it will lead to mismeasurement of the flight spacing.

[0009] In some embodiments, the detecting the coating starting position of the first coating mechanism by the first color mark sensor includes: It is determined whether there is a coating area before coating on the substrate to be coated. If so, the coating start position of the first coating mechanism is determined after the substrate rotates by a preset length. Since there is a substrate coating area at the roll change location or before each rack, although continuous signals can be detected in these two situations, the coating area is not the area to be tested, which will lead to false detection. By determining the coating start position of the first coating mechanism after the substrate rotates by a preset length, false detection can be effectively avoided.

[0010] In a second aspect, the present application proposes a synchronous surface density measurement device, comprising: The first acquisition module: for obtaining the No. 1 surface density meter to the No. 2 surface density meter when running synchronously between the tape length L1; The second acquisition module is used to obtain the tape running length L2 between the first area density meter and the second area density meter during actual operation, which includes: A first detection module, used for detecting a coating start position of the first coating mechanism through a first color mark sensor; A second detection module, used for detecting a coating starting position of the second coating mechanism through a second color mark sensor; A deviation correction module, used for correcting the position of the second color mark sensor through a deviation correction mechanism, so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; A third acquisition module is used to acquire the tape running length L2 according to the position of the second color mark sensor after correction and the position of the first color mark sensor; The determination module is used to determine the compensation value △L of the second surface density meter according to L1 and L2, wherein △L=(L1-L2) / 2.

[0011] In some embodiments, the surface density synchronous measurement device further includes: The judgment module is used to determine the size of △L and the threshold value L3. When △L>L3, the No. 2 surface density meter does not perform compensation; when △L<≤L3, the No. 2 surface density meter performs compensation.

[0012] In some embodiments, the surface density synchronous measurement device further includes: The alarm module is used to sound an alarm when △L>L3.

[0013] In a third aspect, the present application proposes a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements a method for synchronously measuring surface density as described in any one of the embodiments of the present application.

[0014] In a fourth aspect, the present application proposes a computer-readable storage medium having a computer program stored thereon, wherein the computer program is used to implement a method for synchronously measuring surface density as described in any one of the embodiments of the present application.

[0015] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of a process flow of a method for synchronously measuring surface density provided in some embodiments of the present application; Figure 2 A schematic diagram of a coating process provided for some embodiments of the present application; Figure 3 A schematic diagram of a surface density meter detection scan provided in some embodiments of the present application; Figure 4 A schematic diagram of another surface density meter detection scan provided in some embodiments of the present application; Figure 5 Another schematic diagram of a surface density meter detection scan provided in some embodiments of the present application; Figure 6 A schematic diagram of the structure of a computer device provided for some embodiments of the present application.

[0017] The reference numerals in the specific implementation manner are as follows: 11. Unwinding mechanism; 12. Base material; 121. Side A; 122. Side B; 13. First backing roller; 14. First coating mechanism; 15. First drying oven; 16. No. 1 surface density meter; 17. Second coating mechanism; 18. Second backing roller; 19. Second drying oven; 20. No. 2 surface density meter; 21. Rewinding mechanism; 22. Correction mechanism. DETAILED DESCRIPTION

[0018] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0024] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0025] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0027] In the lithium battery production process, the surface density of single-sided and double-sided coatings of dry film lithium battery pole pieces is mainly measured by multi-frame surface density measuring instruments to measure the surface density of the substrate, single-sided pole piece (substrate + A-side coating), and double-sided pole piece (substrate + A and B-side coatings).

[0028] When the measuring instruments in the related technology are in use, the synchronization of multiple surface density measuring instruments is poor, and the accuracy difference at the same point during high-speed scanning is >±20mm; there are large position errors in single and double-layer scanning, resulting in large measurement errors in the synchronous scanning and deduction of the net weight of the single- and double-sided coatings, making it impossible to accurately calculate the surface density of the B-side coating.

[0029] Based on the above considerations, in order to solve the problem that the two surface density meters have poor synchronization during use and cannot accurately calculate the surface density of the B surface coating, a surface density synchronous measurement method is designed, the method comprising: obtaining the tape running length L1 between the No. 1 surface density meter and the No. 2 surface density meter during synchronous operation; obtaining the tape running length L2 between the No. 1 surface density meter and the No. 2 surface density meter during actual operation; determining the compensation value △L of the No. 2 surface density meter according to L1 and L2, wherein △L=(L1-L2) / 2.

[0030] The No. 2 surface density meter is compensated by the compensation value △L so that the scanning tracks of the No. 1 surface density meter and the No. 2 surface density meter overlap, thus ensuring that the No. 1 surface density meter and the No. 2 surface density meter detect the same position, and the surface density of the coating can be accurately calculated based on the difference between the No. 2 surface density meter and the No. 1 surface density meter.

[0031] According to some embodiments of the present application, Figure 1 FIG. 1 is a flow chart of the method for synchronously measuring surface density in this application. Figure 1 As shown, the present application provides a method for synchronous measurement of surface density, the method comprising: obtaining a tape running length L1 between a No. 1 surface density meter and a No. 2 surface density meter during synchronous operation; obtaining a tape running length L2 between a No. 1 surface density meter and a No. 2 surface density meter during actual operation, which comprises: detecting a coating start position of a first coating mechanism by a first color mark sensor; detecting a coating start position of a second coating mechanism by a second color mark sensor; correcting the position of the second color mark sensor by a correction mechanism 22 so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; obtaining the tape running length L2 according to the position of the second color mark sensor after correction and the position of the first color mark sensor; The compensation value △L of the No. 2 surface density meter is determined based on L1 and L2, where △L=(L1-L2) / 2.

[0032] refer to Figure 2 As shown, Figure 2Schematic diagram of the coating process in this application, wherein after the unwinding mechanism 11 releases the substrate 12, the substrate 12 will sequentially pass through the first back roller 13, the first oven 15, the No. 1 surface density meter 16, the second back roller 18, the second oven 19, the No. 2 surface density meter 20 and then enter the winding mechanism 21. When the substrate 12 passes through the first back roller 13, the first coating mechanism 14 will coat the A surface 121 of the substrate 12, and when the substrate 12 passes through the second back roller 18, the second coating mechanism 17 will coat the B surface of the substrate 12.

[0033] The unwinding mechanism 11 in this embodiment may include an unwinding roller, a motor and a frame, the two ends of the unwinding roller are connected to the frame through a rotating shaft, the motor is fixed to the frame, and the output shaft of the motor is connected to the rotating shaft on the unwinding roller. The unwinding roller can release the substrate to be coated by driving the rotating shaft to rotate by the motor. Of course, it can be understood that the unwinding mechanism 11 in this embodiment can also be other structures, for example: the unwinding mechanism 11 includes an unwinding roller, a transmission gear and a motor, which can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0034] The substrate 12 on the unwinding mechanism 11 in this embodiment can be a coated substrate with good conductivity, such as copper foil, aluminum foil, stainless steel, etc. The specific substrate can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0035] The substrates in this embodiment are all regular structures. The first and second surfaces of the substrates with common regular shapes are opposite to each other, and along the width direction of the substrate, the two edges of the first surface and the two edges of the second surface are projected to coincide. In the case of a special-shaped substrate, the first and second surfaces may be staggered.

[0036] The winding mechanism 21 in this embodiment may include a winding roller, a motor and a frame, the two ends of the winding roller are connected to the frame through a rotating shaft, the motor is fixed to the frame, and the output shaft of the motor is connected to the rotating shaft on the winding roller. By driving the rotating shaft to rotate by the motor, the coated substrate can enter the winding roller to form a coil. Of course, it can be understood that the winding mechanism 21 in this embodiment can also be other structures, for example: the winding mechanism 21 includes a winding roller, a transmission gear and a motor, and the specific structure can be determined according to actual conditions, and this specification embodiment does not limit this.

[0037] The coating speed direction in this embodiment is as follows Figure 3 or Figure 4 or Figure 5 V1 in.

[0038] In this embodiment, the tape running length L2 is obtained according to the position of the second color mark sensor and the position of the first color mark sensor after correction, so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism, thereby accurately calculating the tape running length L2.

[0039] When using, refer to Figure 3 As shown, the tape running length L1 between the No. 1 surface density meter 16 and the No. 2 surface density meter 20 during synchronous operation is obtained; then the tape running length L2 between the No. 1 surface density meter 16 and the No. 2 surface density meter 20 during actual operation is obtained; finally, the compensation value △L of the No. 2 surface density meter is determined according to L1 and L2, wherein △L=(L1-L2) / 2. In this way, in the actual measurement process, the distance compensation is performed on the No. 2 surface density meter 20 so that the measurement path of the No. 1 surface density meter 16 and the measurement path of the No. 2 surface density meter 20 coincide. After the No. 1 surface density meter 16 measures the surface density of the A surface and the No. 2 surface density meter 20 measures the surface density of the A surface + the B surface, the surface density of the B surface can be accurately calculated by the difference between the No. 2 surface density meter and the No. 1 surface density meter. Furthermore, by obtaining the tape running length L2 according to the positions of the second color mark sensor and the first color mark sensor after correction, the coating start position of the second coating mechanism can be made to coincide with the coating start position of the first coating mechanism, thereby accurately calculating the tape running length L2.

[0040] According to some embodiments of the present application, after determining the compensation value ΔL of the second areal density meter according to L1 and L2, the method further includes: Determine the size of △L and threshold value L3. Under the condition of △L>L3, the No. 2 surface density meter does not make compensation; under the condition of △L≤L3, the No. 2 surface density meter makes compensation. Due to the large change in substrate tension and the slip of the encoder wheel on the back roller, the calculation of △L will have errors. At this time, it is determined whether △L is greater than L3. If it is greater, the No. 2 surface density meter will not make compensation.

[0041] According to some embodiments of the present application, the method for synchronously measuring surface density further includes an alarm system; Under the condition of △L>L3, the alarm system will sound an alarm. In this way, it can effectively remind the staff to operate in time to avoid being in a faulty working condition.

[0042] According to some embodiments of the present application, detecting the coating start position of the first coating mechanism by using a first color mark sensor includes: Determine whether the signal detected by the first color mark sensor is continuous within a preset time period; if so, determine the starting coating position of the first coating mechanism; if not, determine the starting coating position of the first coating mechanism after the first color mark sensor detects a continuous signal.

[0043] refer to Figure 4As shown, Figure 4 The coating start position of the left black part is not continuous, so the detection signal of the first color mark sensor is intermittent, which may cause mismeasurement of the tape length L2. In this embodiment, the coating start position of the first coating mechanism is determined only after the signal detected by the first color mark sensor is determined to be a continuous signal within a preset time, so that mismeasurement of the tape length L2 can be avoided.

[0044] According to some embodiments of the present application, detecting the coating start position of the first coating mechanism by using a first color mark sensor includes: It is determined whether there is a coating area on the substrate to be coated before coating. If so, the coating starting position of the first coating mechanism is determined after the substrate rotates over a preset length.

[0045] refer to Figure 5 As shown, Figure 5 The black interval on the left is the substrate coating area that exists at the roll change point or before each rack. Although continuous signals can be detected in these two cases, the coating area is not the area to be tested, which will lead to false detection. By determining the coating start position of the first coating mechanism after the substrate has rotated for a preset length, false detection can be effectively avoided.

[0046] The present application also provides a surface density synchronous measurement device, comprising: The first acquisition module: for obtaining the No. 1 surface density meter to the No. 2 surface density meter when running synchronously between the tape length L1; The second acquisition module is used to obtain the running length L2 between the No. 1 surface density meter and the No. 2 surface density meter during actual operation, and includes: a first detection module, used to detect the coating start position of the first coating mechanism through the first color mark sensor; a second detection module, used to detect the coating start position of the second coating mechanism through the second color mark sensor; a correction module, used to correct the position of the second color mark sensor through the correction mechanism 22, so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; a third acquisition module, which obtains the running length L2 according to the position of the second color mark sensor after correction and the position of the first color mark sensor; The determination module is used to determine the compensation value △L of the second surface density meter according to L1 and L2, wherein △L=(L1-L2) / 2.

[0047] It should be understood that the units or modules described in the above device are similar to those described in the reference Figure 1 Therefore, the operations and features described above for the method are also applicable to the device and the modules included therein, and will not be described in detail here.

[0048] According to some embodiments of the present application, the surface density synchronous measurement device further includes: The judgment module is used to determine the size of △L and the threshold value L3. When △L>L3, the No. 2 surface density meter does not perform compensation; when △L<≤L3, the No. 2 surface density meter performs compensation. Due to the large change in the tension of the substrate and the slippage of the encoding wheel on the backing roller, the calculation of △L will have errors. At this time, it is judged whether △L is greater than L3. If it is greater, the No. 2 surface density meter will not be compensated.

[0049] According to some embodiments of the present application, the surface density synchronous measurement device further includes: The alarm module is used to alarm when △L>L3. In this way, it can effectively remind the staff to operate in time to avoid being in a fault condition.

[0050] The computer device also provided in the embodiment of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the synchronous surface density measurement method as described above is implemented.

[0051] Reference below Figure 6 , Figure 6 A schematic diagram of the structure of a computer device according to an embodiment of the present application.

[0052] like Figure 6 As shown, the computer system 300 includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 302 or a program loaded from a storage part 303 to a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the system 300 are also stored. The CPU 301, the ROM 302, and the RAM 303 are connected to each other through a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0053] The following components are connected to the I / O interface 305: an input section 306 including a keyboard, a mouse, etc.; an output section 307 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 308 including a hard disk, etc.; and a communication section 309 including a network interface card such as a LAN card, a modem, etc. The communication section 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I / O interface 305 as needed. A removable medium 311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 310 as needed, so that a computer program read therefrom is installed into the storage section 308 as needed.

[0054] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 303, and / or installed from the removable medium 311. When the computer program is executed by the central processing unit (CPU) 301, the above-mentioned functions defined in the system of the present application are executed.

[0055] It should be noted that the computer-readable medium shown in the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0056] As another aspect, the present application further provides a computer-readable storage medium, which may be included in the device described in the above embodiment; or may exist independently without being assembled into the device. The above computer-readable storage medium stores one or more programs, and when the above programs are used by one or more processors to execute the surface density synchronous measurement method described in the present application.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for synchronously measuring surface density, characterized in that: The method includes: Get the tape length L1 between the No. 1 area density meter and the No. 2 area density meter during synchronous operation; Obtain the tape running length L2 between the No. 1 areal density meter and the No. 2 areal density meter during actual operation, which includes: Detecting the coating starting position of the first coating mechanism by means of a first color mark sensor; Detecting the coating starting position of the second coating mechanism by means of a second color mark sensor; Correcting the position of the second color mark sensor by means of a correction mechanism so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; Obtaining the tape running length L2 according to the position of the second color mark sensor after deviation correction and the position of the first color mark sensor; The compensation value △L of the No. 2 surface density meter is determined based on L1 and L2, where △L=(L1-L2) / 2.

2. The method for synchronously measuring surface density according to claim 1, characterized in that: After determining the compensation value ΔL of the second area density meter according to L1 and L2, the method further includes: The size of △L and the threshold value L3 is determined. Under the condition of △L>L3, the No. 2 surface density meter does not perform compensation; under the condition of △L≤L3, the No. 2 surface density meter performs compensation.

3. The method for synchronously measuring surface density according to claim 2, characterized in that: The synchronous surface density measurement method also includes an alarm system; Under the condition of ΔL>L3, the alarm system sounds an alarm.

4. The method for synchronously measuring surface density according to claim 1, characterized in that: The method of detecting the coating starting position of the first coating mechanism by using the first color mark sensor comprises: It is determined whether the signal detected by the first color mark sensor is continuous within a preset time period. If so, the coating start position of the first coating mechanism is determined. If not, the coating start position of the first coating mechanism is determined after the first color mark sensor detects a continuous signal.

5. The method for synchronously measuring surface density according to claim 1, characterized in that: The method of detecting the coating starting position of the first coating mechanism by using the first color mark sensor comprises: It is determined whether there is a coating area on the substrate to be coated before coating. If so, the coating starting position of the first coating mechanism is determined after the substrate rotates over a preset length.

6. A synchronous surface density measurement device, characterized in that: include: The first acquisition module: for obtaining the No. 1 surface density meter to the No. 2 surface density meter when running synchronously between the tape length L1; The second acquisition module is used to obtain the tape running length L2 between the first area density meter and the second area density meter during actual operation, which includes: A first detection module, used for detecting a coating start position of the first coating mechanism through a first color mark sensor; A second detection module, used for detecting a coating starting position of the second coating mechanism through a second color mark sensor; A deviation correction module, used for correcting the position of the second color mark sensor through a deviation correction mechanism, so that the coating start position of the second coating mechanism coincides with the coating start position of the first coating mechanism; A third acquisition module is used to acquire the tape running length L2 according to the position of the second color mark sensor after correction and the position of the first color mark sensor; The determination module is used to determine the compensation value △L of the second surface density meter according to L1 and L2, wherein △L=(L1-L2) / 2.

7. The synchronous surface density measuring device according to claim 6, characterized in that: The surface density synchronous measurement device also includes: The judgment module is used to determine the size of △L and the threshold value L3. When △L>L3, the No. 2 surface density meter does not perform compensation; when △L<≤L3, the No. 2 surface density meter performs compensation.

8. The synchronous surface density measuring device according to claim 6, characterized in that: The surface density synchronous measurement device also includes: The alarm module is used to sound an alarm when △L>L3.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for synchronously measuring surface density according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program is used to implement the method for synchronously measuring surface density according to any one of claims 1 to 5.

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