Screw pump control method and device, coating machine and storage medium

Abstract

The invention provides a screw pump control method and device, a coating machine and a storage medium. Relates to the field of coating control. The method comprises the following steps: when an initialization process of the coating machine is completed, obtaining a state of a control function in the coating machine; when the state of the control function in the coating machine is a starting state, collecting at least one group of operating parameters, and determining a first target rotating speed according to the at least one group of operating parameters; the first target rotating speed is used for indicating the rotating speed of the corresponding screw pump when the surface density reaches a first threshold value; and controlling the screw pump to rotate based on the first target rotating speed so as to drive the die head to carry out coating treatment on the target equipment. According to the application, the rotating speed of the screw pump can be quickly adjusted according to the operating parameters of the coating machine, so that the surface density is quickly adjusted to the first threshold value, the time consumed in the adjusting process and the number of pole pieces are shortened, and the cost of the coating process is reduced.

Description

Technical Field

[0001] The present application relates to the field of coating control, and in particular to a screw pump control method, device, coating machine and storage medium. Background Art

[0002] When the coater enters the coating process, the slurry in the die head of the coater enters the internal circulation. At this time, the diaphragm valve in the external circulation pipeline is closed, so that the pressure in the pipeline cavity of the coater gradually decreases.

[0003] The closure of the diaphragm valve in the external circulation pipeline will cause reflux in the pipeline of the coating machine. The reflux pressure of the pipeline in the coating machine is negatively correlated with the duration of the surface density reduction. Generally, in order to improve the coating efficiency of the coating machine, the staff will increase the reflux pressure of the pipeline in the coating machine. This makes the surface density reduction process take a long time.

[0004] The staff can adjust the surface density by manually adjusting the speed of the screw pump. However, the surface density adjustment and detection process takes a certain amount of time. During the process of adjusting and detecting the surface density, the coating machine will continue to consume a large number of electrodes, resulting in an increase in the cost of the coating process. Summary of the invention

[0005] The present application provides a screw pump control method, device, coater and storage medium, which automatically adjusts the rotation speed of the screw pump according to at least one set of collected operating parameters when the initialization process of the coater is completed and the control function is started, so as to solve the problem that the time-consuming adjustment of the surface density in the existing coating process is too long, resulting in high cost of the coating process.

[0006] In a first aspect, the present application provides a screw pump control method, which is applied to a coating machine, wherein the coating machine includes a screw pump and a die head, and the method includes:

[0007] When the initialization process of the coating machine is completed, obtaining the state of the control function in the coating machine;

[0008] When the state of the control function in the coating machine is in the startup state, at least one set of operating parameters is collected, and a first target speed is determined according to the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold value;

[0009] The screw pump is controlled to rotate based on the first target rotation speed to drive the die head to perform coating processing on the target device.

[0010] In a possible implementation, when the state of the control function in the coating machine is in the startup state, collecting at least one set of operating parameters, and determining the first target speed according to the at least one set of operating parameters includes:

[0011] When the state of the control function indicates the start-up state, collecting at least one set of operating parameters and die parameters in the coating machine;

[0012] Determining a first surface density variation coefficient according to the at least one set of operating parameters, and determining a compensation value of the screw pump according to the first surface density variation coefficient and the die head parameters;

[0013] A first target rotation speed of the screw pump is calculated according to the compensation value.

[0014] In a possible implementation manner, after obtaining the state of the control function in the coating machine, the method includes:

[0015] When the state of the control function indicates an off state, obtaining a preset compensation value;

[0016] A second target rotation speed is calculated according to the preset compensation value, and the screw pump is controlled to rotate based on the second target rotation speed to drive the die head to perform coating processing on the target device.

[0017] In a possible implementation, the operating parameters include a first rotational speed, a first surface density, and a time point; determining the first surface density variation coefficient according to the at least one set of operating parameters, and determining the compensation value of the screw pump according to the first surface density variation coefficient and the die head parameters, includes:

[0018] When the first surface density greater than the first threshold value exists in the at least one set of operating parameters, determining a target fitting function of the surface density according to at least one set of the first rotation speed, the first surface density and the time point;

[0019] Calculating the first surface density variation coefficient according to the target fitting function of the surface density;

[0020] The compensation value is obtained by fitting according to the first surface density variation coefficient and the die parameters.

[0021] In a possible implementation manner, after collecting at least one set of operating parameters, the step includes:

[0022] When all the first surface density values ​​in the at least one set of operating parameters are less than the first threshold, the process returns to the step of collecting at least one set of operating parameters and subsequent steps.

[0023] In a possible implementation, after controlling the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device, the method includes:

[0024] Collecting the operating speeds of multiple groups of the screw pumps at preset time intervals;

[0025] When the operating speeds of multiple groups of the screw pumps are greater than or equal to the second threshold and less than or equal to the third threshold, the state of the control function is updated to a closed state; wherein the second threshold is used to indicate the minimum speed of the screw pump when the surface density reaches the first threshold, and the third threshold is used to indicate the maximum speed of the screw pump when the surface density reaches the first threshold.

[0026] In a possible implementation manner, after collecting the operating speeds of the plurality of groups of the screw pumps, the method includes:

[0027] When there is an operating speed less than the second threshold or greater than the third threshold among the multiple groups of operating speeds of the screw pump, when the state of executing the control function in the coating machine is returned to the startup state, at least one group of operating parameters are collected, and the first target speed and subsequent steps are determined according to the at least one group of operating parameters.

[0028] In a possible implementation manner, after controlling the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device, the method further comprises:

[0029] Collecting a second surface density, and determining a second surface density coefficient according to the second surface density; the first collection time of the second surface density is after the second collection time of the first surface density;

[0030] When the second surface density coefficient is negatively correlated with time and the second surface density coefficient is less than a fourth threshold, the state of the control function is updated to a closed state; wherein the fourth threshold is less than the first surface density coefficient and less than 1.

[0031] In a possible implementation manner, after collecting the second surface density and determining the second surface density coefficient according to the second surface density, the method further includes:

[0032] When the second surface density coefficient is greater than or equal to the fourth threshold value, the state of executing the control function in the coater is returned to the startup state, at least one set of operating parameters is collected, and the first target speed and subsequent steps are determined according to the at least one set of operating parameters until the second surface density coefficient is less than the fourth threshold value.

[0033] In a second aspect, the present application provides a screw pump control device, which is applied to a coating machine, wherein the coating machine includes a screw pump and a die head, and the screw pump control device includes:

[0034] A data acquisition module, used for acquiring the status of the control function in the coating machine when the initialization process of the coating machine is completed;

[0035] A determination module, used for collecting at least one set of operating parameters when the state of the control function in the coating machine is in the startup state, and determining a first target speed according to the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold value;

[0036] The first control module is used to control the screw pump to rotate based on the first target rotation speed to drive the die head to perform coating processing on the target device.

[0037] In the third aspect, an embodiment of the present application provides a coating machine, comprising: a screw pump, a die head, at least one processor and a memory; the memory stores computer execution instructions; at least one processor executes the computer execution instructions stored in the memory, so that at least one processor executes the screw pump control method involved in the first aspect and any item of the first aspect above.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer execution instructions are stored. When a processor executes the computer execution instructions, the screw pump control method involved in the first aspect and any item of the first aspect is implemented.

[0039] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the screw pump control method involved in the first aspect and any item of the first aspect.

[0040] The present application provides a screw pump control method, device, coating machine and storage medium. When the initialization process of the coating machine is completed and the control function in the coating machine is in the startup state, at least one set of parameters is collected, and the first target speed of the screw pump corresponding to the surface density reaching the first threshold is determined according to at least one set of operating parameters, and the screw pump is controlled to rotate based on the first target speed to drive the die head to coat the target device. In this way, the screw pump speed can be quickly adjusted at the end of the initialization process, so that the surface density quickly reaches the first threshold, shortening the time consumption of the adjustment process and the number of pole pieces consumed, thereby reducing the cost of the coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] Figure 1 One of the flow charts of a screw pump control method provided in an embodiment of the present application;

[0043] Figure 2 A second flow chart of a screw pump control method provided in an embodiment of the present application;

[0044] Figure 3 A third flow chart of a screw pump control method provided in an embodiment of the present application;

[0045] Figure 4 A fourth flow chart of a screw pump control method provided in an embodiment of the present application;

[0046] Figure 5 A schematic diagram of a screw pump control process provided in an embodiment of the present application;

[0047] Figure 6 A graph showing the relationship between surface density and time points provided in the embodiments of the present application;

[0048] Figure 7 A schematic diagram of the structure of a screw pump control device provided in an embodiment of the present application;

[0049] Figure 8 A schematic structural diagram of a coating machine provided in an embodiment of the present application.

[0050] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0052] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with the relevant laws, regulations and standards of the relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0053] It should be noted that the screw pump control method, device, coater and storage medium provided in the present application can be used in the coating control field, and can also be used in any field except the coating control field. The application field of the screw pump control method, device, coater and storage medium is not limited in the present application.

[0054] Coating treatment: refers to the process of evenly applying the positive and negative electrode slurry to the base layer of the equipment to be processed.

[0055] Surface density, also known as coating surface density, refers to the ratio of the surface covering mass of the coating or fiber material to the surface area, usually in grams per square meter (g / m 2 ) or grams per square centimeter (g / cm 2 ).

[0056] In the processing of some equipment (such as lithium-ion batteries), the coating process is an important process. When the coater enters the coating process, the die head of the coater will perform the feeding and discharging operations. After each feeding of the die head, the slurry switches from the external circulation to the internal circulation. At this time, the diaphragm valve in the external circulation pipeline is closed, causing the reflux of the pipeline in the coater. The reflux pressure of the pipeline in the coater is negatively correlated with the length of time it takes to reduce the surface density. If the reflux pressure of the pipeline in the coater is too large, the surface density will increase, resulting in a longer time for the surface density reduction process. If the reflux pressure of the pipeline in the coater is too small, it will also take a long time for the surface density to be reduced.

[0057] In order to improve the coating efficiency of the coater, the staff increases the reflux pressure of the pipe in the coater, which will cause the surface density value to gradually increase, or even exceed the maximum limit of the surface density. The staff can adjust the surface density by manually adjusting the speed of the screw pump. However, since the process of adjusting and detecting the surface density takes a certain amount of time, the coater will continue to consume a large number of electrodes during the above adjustment and detection process, resulting in an increase in the cost of the coating process.

[0058] In order to solve the above problems, the present application obtains the state of the control function in the coating machine when the initialization process of the coating machine is completed, collects at least one set of parameters when the state of the control function in the coating machine is the startup state, determines the first target speed of the screw pump corresponding to the surface density reaching the first threshold value according to at least one set of operating parameters, and controls the screw pump to rotate based on the first target speed to drive the die head to coat the target device. In this way, the screw pump speed can be quickly adjusted at the end of the initialization process, so that the surface density quickly reaches the first threshold value, shortening the time consumed by the adjustment process and the number of pole pieces, thereby reducing the cost of the coating process.

[0059] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0060] Figure 1 A flow chart of a screw pump control method provided in an embodiment of the present application.

[0061] See also Figure 1 As shown, the method may include the following steps:

[0062] S101. When the initialization process of the coating machine is completed, obtain the state of the control function in the coating machine.

[0063] The execution subject of the embodiment of the present application can be a coating machine, or a screw pump control device arranged in the coating machine. The screw pump control device can be implemented by software, or by a combination of software and hardware.

[0064] Specifically, when the initialization process of the coating machine is completed, the coating machine begins to enter the coating process, the screw pump in the coating machine starts to rotate, and drives the die head to rotate, so as to coat the target device through the die head. The target device is used to indicate the product to be processed by the coating machine. For example, the target device may include a lithium-ion battery.

[0065] Specifically, the state of the control function in the coating machine is obtained, and the state of the control function includes a start state and a shutdown state. Among them, the start state is used to instruct the coating machine to automatically collect operating parameters and adjust the speed of the screw pump according to the operating parameters. The shutdown state is used to instruct the coating machine to automatically adjust the speed of the screw pump according to the preset compensation value, or the coating machine adjusts the speed of the screw pump according to the user's operation.

[0066] It can be understood that since the die cavity and the slit in the coater remain unchanged, the rotation speed of the screw pump in the coater is positively correlated with the surface density. Therefore, the surface density can be adjusted by adjusting the rotation speed of the screw pump.

[0067] S102. When the control function in the coating machine is in the startup state, collect at least one set of operating parameters, and determine a first target speed based on the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold.

[0068] Specifically, when the state of the control function in the coating machine is the startup state, it is determined that the automated screw pump control program can be executed. At least one set of operating parameters is collected, and the operating parameters are used to indicate the parameters of the coating machine during the coating process when the initialization process is completed. The operating parameters X include but are not limited to the real-time rotation speed n of the screw pump, the first surface density σ, and the time point t.

[0069] The value of the time point can be specifically set according to actual needs. For example, a set of operating parameters can be collected every 10 seconds, and the difference between the time points of each two sets of operating parameters is 10 seconds. Alternatively, a set of operating parameters can be collected every 20 seconds, and the difference between the time points of each two sets of operating parameters is 20 seconds.

[0070] Specifically, a first target rotation speed is determined by collecting at least one set of operating parameters, and the first target rotation speed is used to indicate the rotation speed of the corresponding screw pump when the surface density reaches a first threshold value.

[0071] The first threshold is used to indicate the surface density quality standard value of the coating process corresponding to the target device, which can also be called the target surface density value. That is, when the surface density reaches the first threshold, the coating process is performed on the target device, so that the coating process quality of the target device can meet the quality inspection standard.

[0072] S103, controlling the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device.

[0073] Specifically, the screw pump is controlled to rotate based on a first target rotation speed to drive the die head to perform coating processing on the target device, so that the surface density during the coating process reaches a first threshold value.

[0074] In some possible implementations, after obtaining the state of the control function in the coating machine, the method includes:

[0075] When the state of the control function indicates an off state, obtaining a preset compensation value;

[0076] A second target rotation speed is calculated according to the preset compensation value, and the screw pump is controlled to rotate based on the second target rotation speed to drive the die head to perform coating processing on the target device.

[0077] Specifically, when the status of the coating centralized control function indicates the off state, it is determined that there is no need to automatically adjust the rotation speed of the screw pump through the operating parameters. A preset compensation value is obtained, a second target rotation speed is calculated and determined according to the preset compensation value, and the screw pump is controlled to rotate based on the second target rotation speed to drive the die head to coat the target device, thereby realizing the coating process of the target device.

[0078] The preset compensation value is a preset deceleration of the rotation speed of the screw pump. The preset compensation value can be specifically set according to actual needs. For example, the preset compensation value can be set to -5%. Alternatively, the preset compensation value can be set to -10%.

[0079] It is understandable that the user can also adjust the speed of the screw pump in the coating machine by controlling the coating machine, for example, by touching (such as clicking, dragging, etc.) the display screen of the coating machine to adjust the speed of the screw pump, or by pressing and rotating the external buttons of the coating machine to adjust the speed of the screw pump.

[0080] The embodiment of the present application obtains the state of the control function in the coating machine when the initialization process of the coating machine is completed. When the state of the control function in the coating machine is the startup state, the first target speed of the screw pump corresponding to the surface density reaching the first threshold is determined according to at least one set of collected operating parameters, and the screw pump is controlled to rotate based on the first target speed to drive the die head to coat the target device. In this way, the screw pump speed can be quickly adjusted at the end of the initialization process, so that the surface density quickly reaches the first threshold, eliminating the abnormal surface density value of the coating machine during the startup and pause stages, shortening the time consumed by the adjustment process and the number of pole pieces, thereby reducing the cost of the coating process.

[0081] Figure 2 A flow chart of another screw pump control method provided in the embodiment of the present application. Figure 2 , the method may include the following steps:

[0082] S1021. When the state of the control function indicates a startup state, collect at least one set of operating parameters and die parameters of the coating machine.

[0083] Specifically, when the status of the control function in the coater indicates the start-up state, at least one set of operating parameters and die parameters in the coater are collected. The die parameters are specifically used to calculate the rotation speed compensation value of the screw pump to adjust the rotation speed of the screw pump.

[0084] S1022. Determine a first surface density variation coefficient according to the at least one set of operating parameters, and determine a compensation value of the screw pump according to the first surface density variation coefficient and the die head parameters.

[0085] Specifically, based on the polynomial fitting method, the first surface density variation coefficient k is calculated according to at least one set of collected operating parameters X{n, σ, t}. σ , and according to the first surface density variation coefficient k σ and die head parameters, calculate and determine the speed compensation value n of the screw pump t .

[0086] S1023. Calculate a first target rotation speed of the screw pump according to the compensation value.

[0087] Specifically, the first target rotation speed of the screw pump is calculated according to the rotation speed compensation value of the screw pump and the rotation speed of the screw pump at the current moment.

[0088] In some possible implementations, the operating parameters include a first rotation speed, a first surface density, and a time point; and step S1022 includes:

[0089] When the first surface density greater than the first threshold value exists in the at least one set of operating parameters, determining a target fitting function of the surface density according to at least one set of the first rotation speed, the first surface density and the time point;

[0090] Calculating the first surface density variation coefficient according to the target fitting function of the surface density;

[0091] The compensation value is obtained by fitting according to the first surface density variation coefficient and the die parameters.

[0092] Specifically, if there is a first surface density greater than a first threshold value in at least one set of collected operating parameters, it is determined that the collected first surface density is too large, and the surface density can be reduced by adjusting the rotation speed of the screw pump. According to the first rotation speed, the first surface density and the time point of the screw pump in at least one set of operating parameters, a target fitting function of the surface density is calculated by a polynomial fitting algorithm, and according to the target fitting function of the surface density, a variation coefficient of the first surface density is derived. According to the first surface density variation coefficient and the die head parameters, a rotation speed compensation value of the screw pump is obtained by fitting calculation.

[0093] The first threshold may include the maximum surface density quality standard value of the target device in the coating process, or the first threshold may include the minimum surface density quality standard value of the target device in the coating process. Exemplarily, if the surface density quality standard interval of the target device in the coating process is [50, 60], the first threshold may be 50, or the first threshold may be 60.

[0094] Optionally, the rotation speed compensation value of the screw pump may include the adjustment data of the rotation speed of the screw pump, and may also include the target rotation speed data of the screw pump. For example, the rotation speed compensation value of the screw pump includes that the rotation speed of the screw pump is reduced by 10%, or the rotation speed of the screw pump is increased by 10%. For another example, the rotation speed compensation value of the screw pump includes that the target rotation speed data of the screw pump is 90, or the target rotation speed data of the screw pump is 100.

[0095] In some possible implementations, after collecting at least one set of operating parameters, the step includes:

[0096] When all the first surface density values ​​in the at least one set of operating parameters are less than the first threshold, the process returns to the step of collecting at least one set of operating parameters and subsequent steps.

[0097] Specifically, among at least one set of operating parameters collected, if each first surface density value is less than the first threshold value, it is determined that the first surface density is low, and there is no need to adjust the rotation speed of the screw pump. Return to execute step S102 to collect at least one set of operating parameters and subsequent steps, and monitor the surface density in real time. When the surface density is detected to be greater than the first threshold value, the rotation speed of the screw pump is adjusted in time to reduce the surface density.

[0098] The present application automatically controls the screw pump speed when initialization is completed according to the collected operating parameters under a reasonable reflux pressure (and can quickly reduce the surface density), thereby effectively suppressing the increase in surface density caused by the reflux pressure, shortening the time spent in adjusting the surface density and the number of pole pieces used in the coater, thereby reducing the cost of the coating process.

[0099] Figure 3 A flow chart of another screw pump control method provided in the embodiment of the present application. Figure 3 , the method may include the following steps:

[0100] S201. Collecting the operating speeds of multiple groups of the screw pumps at preset time intervals.

[0101] Specifically, the operating speeds of multiple groups of screw pumps are collected at preset time intervals. The preset time interval can be specifically set according to actual conditions. The preset time interval can be the same as or different from the collection time interval of at least one group of operating parameters.

[0102] For example, the collection time interval of at least one set of operating parameters is 10s, the difference between the time points in each two sets of operating parameters is 10s, the preset time interval is 10s, and the operating speed of the screw pump is collected once every 10s.

[0103] It is understandable that during the operation of the coating machine, the rotation speed of the screw pump will be disturbed by the outside world. When the screw pump is controlled to rotate based on the first target speed (or the second target speed), the actual operating speed of the screw pump may be the same as the first target speed (or the second target speed), or may be different from the first target speed (or the second target speed). Based on this, the operating speeds of multiple groups of screw pumps can be collected to determine the actual operating conditions of the screw pumps.

[0104] S202. When the operating speeds of multiple groups of screw pumps are greater than or equal to the second threshold and less than or equal to the third threshold, the state of the control function is updated to a closed state; wherein the second threshold is used to indicate the minimum speed of the screw pump when the surface density reaches the first threshold, and the third threshold is used to indicate the maximum speed of the screw pump when the surface density reaches the first threshold.

[0105] Specifically, when the collected operating speeds of multiple groups of screw pumps are greater than or equal to the second threshold and less than or equal to the third threshold, it is determined that the actual operating speed of the screw pump has entered the stable speed range, that is, the surface density value tends to be stable, and the state of the control function is updated to the closed state, and the speed control process of the screw pump is exited.

[0106] It can be understood that when the actual operating speed of the screw pump is greater than or equal to the second threshold and less than or equal to the third threshold, determining that the coater controls the screw pump to rotate at the first target speed can make the surface density value tend to stabilize. Therefore, when the state of the control function is updated to the off state and the speed control process of the screw pump is exited, the coater can lock the speed of the screw pump to the first target speed to maintain the stable state of the surface density, thereby making the coating processing results of the target device more accurate and stable.

[0107] In some possible implementations, after collecting the plurality of groups of operating speeds of the screw pumps, the method further comprises:

[0108] When there is an operating speed less than the second threshold or greater than the third threshold among the multiple groups of operating speeds of the screw pump, when the state of executing the control function in the coating machine is returned to the startup state, at least one group of operating parameters are collected, and the first target speed and subsequent steps are determined according to the at least one group of operating parameters.

[0109] Specifically, when, among the collected operating speeds of the multiple groups of screw pumps, there are operating speeds that are less than the second threshold and / or there are operating speeds that are greater than the third threshold, it is determined that the actual operating speed of the screw pump has not entered the stable speed range and the surface density has not reached a stable state, and the process returns to execute step S102 and subsequent steps to continue adjusting the speed of the screw pump until the operating speeds of the multiple groups of screw pumps collected after re-adjustment are greater than or equal to the second threshold and less than or equal to the third threshold, and it is determined that the actual operating speed of the screw pump has entered the stable speed range.

[0110] After the rotation speed of the screw pump is adjusted to the first target rotation speed, the embodiment of the present application quickly determines whether the surface density has reached a stable state based on whether the actual operating speed of the screw pump is in a stable speed range. On the basis of realizing rapid adjustment of the screw pump rotation speed to adjust the surface density, the adjustment result of the surface density can be quickly determined, and the screw pump control process can be exited when the adjustment is completed, thereby reducing the time spent in detecting the surface density adjustment result, thereby reducing the cost of the coating process.

[0111] Figure 4 A flow chart of another screw pump control method provided in the embodiment of the present application. Figure 4 , the method may include the following steps:

[0112] S301, collecting a second areal density, and determining a second areal density coefficient according to the second areal density; a first collection time of the second areal density is after a second collection time of the first areal density.

[0113] Specifically, when the screw pump is controlled to rotate based on the first target speed (or the second target speed), the second surface density is collected, and the second surface density coefficient is calculated according to the second surface density and the collection time of the second surface density. The second surface density is used to indicate the surface density when the screw pump is controlled to rotate based on the first target speed (or the second target speed). The first collection time of the second surface density is located after the second collection time of the first surface density.

[0114] S302. When the second surface density coefficient is negatively correlated with time and the second surface density coefficient is less than a fourth threshold, updating the state of the control function to a closed state; wherein the fourth threshold is less than the first surface density coefficient and less than 1.

[0115] Specifically, when the second surface density coefficient is negatively correlated with time, it is determined that the second surface density gradually decreases, and when the second surface density coefficient is less than the fourth threshold value, it is determined that the second surface density coefficient approaches 0, then it is determined that the change value of the second surface density decreases and gradually approaches a stable state, the state of the control function can be updated to the closed state, and the speed control process of the screw pump is exited.

[0116] The fourth threshold is smaller than the first surface density coefficient and smaller than 1.

[0117] Optionally, the fourth threshold is a judgment standard data for determining whether the second surface density is stable, and can be infinitely close to 0. In this way, when the second surface density is less than the fourth threshold, it can be determined that the change value of the second surface density decreases and gradually approaches a stable state.

[0118] In some possible implementations, after collecting the second surface density and determining the second surface density coefficient according to the second surface density, the method further includes:

[0119] When the second surface density coefficient is greater than or equal to the fourth threshold value, the state of executing the control function in the coater is returned to the startup state, at least one set of operating parameters is collected, and the first target speed and subsequent steps are determined according to the at least one set of operating parameters until the second surface density coefficient is less than the fourth threshold value.

[0120] Specifically, when the second surface density coefficient is greater than or equal to the fourth threshold value, it is determined that the change value of the second surface density is large and the second surface density has not reached a stable state, and the process returns to execute step S102 and subsequent steps until the second surface density coefficient is less than the fourth threshold value, and the speed control process of the screw pump is exited to complete the process of adjusting the surface density.

[0121] Figure 5 A schematic diagram of a screw pump control process is provided as an example.

[0122] See also Figure 5 When the coating machine enters the coating process, the control process of the screw pump can be realized through the following steps:

[0123] S501, initialization;

[0124] Specifically, the coating machine responds to the initialization instruction and executes the initialization process, and when the initialization process is completed, determines the state of the control function, and when the state of the control function is not closed, executes step S5021. Otherwise, executes step S5022.

[0125] S5021. When the state of the control function is off, obtain a preset compensation value, and calculate a second target rotation speed according to the preset compensation value.

[0126] S5022: When the state of the control function is the startup state, collect at least one set of operating parameters.

[0127] Specifically, when the state of the control function is the startup state, at least one set of operating parameters is collected, the operating parameters include but are not limited to the real-time rotation speed of the screw pump, the first surface density and the time point, and the first surface density in each set of operating parameters is compared with the first threshold value. In at least one set of operating parameters, when each first surface density is less than the first threshold value, return to execute step S5022 and subsequent steps. Otherwise, execute step S5031.

[0128] S5031. When there is a first surface density greater than a first threshold value in at least one set of operating parameters, determine a rotation speed compensation value according to the at least one set of operating parameters.

[0129] S504: Calculate and obtain a first target speed according to the speed compensation value.

[0130] S505, controlling the screw pump to rotate based on the first / second target speed to drive the die head to perform coating processing on the target device.

[0131] Optionally, when the control function is in the startup state and a first target rotation speed is calculated based on at least one set of operating parameters, the screw pump is controlled to rotate based on the first target rotation speed to drive the die head to perform coating processing on the target device.

[0132] Alternatively, when the control function is in the off state and the second target speed is calculated based on the preset compensation value, the screw pump is controlled to rotate based on the second target speed to drive the die head to perform coating processing on the target device.

[0133] Whether the surface density reaches the first threshold, that is, whether the surface density reaches a stable state, can be determined by the operating speed of the screw pump (such as steps S5061-S5062) or the change in the surface density (such as steps S5071-S5072):

[0134] S5061. Collect the operating speeds of multiple groups of screw pumps at preset time intervals.

[0135] Specifically, according to the preset time interval, the operating speeds of multiple groups of screw pumps are collected, and the operating speed of each group is compared with the second threshold and the third threshold. When there is an operating speed less than the second threshold or greater than the third threshold among the operating speeds of the multiple groups of screw pumps, step S5022 and subsequent steps are executed. Otherwise, step S5062 is executed.

[0136] S5062: When the operating speeds of the plurality of screw pumps are greater than or equal to the second threshold and less than or equal to the third threshold, the state of the control function is updated to a closed state.

[0137] S5071. Collect the second surface density, and determine the second surface density coefficient according to the second surface density.

[0138] Specifically, the second surface density is collected, a second surface density coefficient is determined according to the second surface density, and the second surface density is compared with a fourth threshold value, and when the second surface density coefficient is greater than or equal to the fourth threshold value, the process returns to step S5022 and subsequent steps. Otherwise, step 5072 is executed.

[0139] S5072: When the second surface density coefficient is negatively correlated with time and the second surface density coefficient is less than a fourth threshold, update the state of the control function to a closed state.

[0140] S508, exit the screw pump control process.

[0141] Specifically, when the state of the control function is updated to the closed state, the screw pump control process is exited.

[0142] Figure 6 This is a graph showing the relationship between surface density and time.

[0143] See also Figure 6 Curve 1 is used to represent the relationship between the mean surface density and time during the coating process performed on the target device in the related technology, and curve 2 is used to represent the relationship between the mean surface density and time after adjusting the rotation speed of the screw pump through the screw pump control method provided by the embodiment of the present application. Figure 6 In it, σ0 represents the target surface density value (also called the first threshold), σ1 represents the upper limit value of the surface density, and σ2 represents the lower limit value of the surface density.

[0144] At time t0, the coating machine starts coating after the knife is fed in, and the surface density begins to rise.

[0145] In curve 1, after time t0, in order to quickly fill the coating machine die cavity and slit and quickly increase the surface density value, the user can manually set a larger reflux pressure for the coating machine pipeline. The increase in reflux pressure leads to an increase in surface density, which exceeds the upper limit of surface density σ1 after a certain period of time. In order to reduce the surface density, the user can manually adjust the speed of the screw pump. The rate of increase of the mean surface density decreases, and after it decreases to the peak value, the mean surface density will decrease. Since the process of measuring the surface density takes a certain amount of time, the measurement result may have a certain hysteresis, resulting in an excessive decrease in the surface density value, making it impossible for the screw pump speed to quickly recover to the target speed range, causing the surface density to exceed the lower limit of the surface density σ2. When the surface density exceeds the upper limit of the surface density σ1 or the lower limit of the surface density σ2, the coating machine will be damaged, increasing the maintenance cost of the coating machine.

[0146] See also Figure 6 Curve 2 in FIG. 1 shows that, by the screw pump control method provided in the embodiment of the present application, the speed of the screw pump is adjusted to the first target speed. At time t1, the surface density reaches the target surface density value σ t When the multiple sets of operating parameters X{n, σ, t} are collected, the fitting function of the surface density σ is calculated by the polynomial fitting algorithm, and the coefficient of variation k between the target time point and the surface density is obtained by derivation. σ Since the surface density is positively correlated with the screw pump speed, the surface density variation coefficient k can be used to calculate the surface density variation coefficient k. σ The compensation value n of the screw pump speed is calculated by the die head parameters t , to reduce the speed of the screw pump to eliminate the situation where the surface density exceeds the upper limit of the surface density due to the high reflux pressure in the coating machine pipeline.

[0147] By quickly adjusting the screw pump speed, the difference between the mean surface density and the target surface density is small, so the surface density can quickly reach the target surface density value and will not cause the surface density value to exceed the lower limit of the surface density, that is, the surface density can quickly reach a stable state.

[0148] Figure 6 In the figure, time t3 is the time point when the surface density reaches a stable state when the coating process is performed using the relevant technology, and time t2 is the time point when the surface density reaches a stable state when the screw pump speed is adjusted by the screw pump control method provided in the embodiment of the present application.

[0149] Based on this, automatically adjusting the speed of the screw pump according to the operating parameters of the coating machine can effectively reduce the time it takes for the surface density to enter a stable state, improve the consistency of the coating process, and reduce the number of electrodes consumed during the coating process, thereby reducing the cost of the coating process.

[0150] When the rotation speed of the screw pump is adjusted to the target rotation speed, the embodiment of the present application collects actual surface density data to quickly determine whether the surface density has reached a stable state. On the basis of realizing rapid adjustment of the screw pump rotation speed to adjust the surface density, the surface density adjustment result can be quickly determined, and the screw pump control process can be exited when the adjustment is completed, thereby reducing the time spent in detecting the surface density adjustment result, thereby reducing the cost of the coating process.

[0151] Figure 7 A schematic structural diagram of a screw pump control device provided in an embodiment of the present application.

[0152] See also Figure 7 , the screw pump control device 700 includes:

[0153] The data acquisition module 701 is used to obtain the status of the control function in the coating machine when the initialization process of the coating machine is completed;

[0154] A determination module 702 is used to collect at least one set of operating parameters when the state of the control function in the coating machine is in the startup state, and determine a first target speed according to the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold value;

[0155] The control module 703 is used to control the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device.

[0156] In some possible implementations, the determining module includes:

[0157] A parameter acquisition unit, used for collecting at least one set of operating parameters and die parameters in the coating machine when the state of the control function indicates the start state;

[0158] a compensation determination unit, configured to determine a first surface density variation coefficient according to the at least one set of operating parameters, and determine a compensation value of the screw pump according to the first surface density variation coefficient and the die head parameters;

[0159] The first target speed calculation unit is used to calculate the first target speed of the screw pump according to the compensation value.

[0160] In some possible implementations, the device includes:

[0161] A second target speed acquisition module, used for acquiring a preset compensation value when the state of the control function indicates an off state;

[0162] The second control module is used to calculate a second target rotation speed according to the preset compensation value, and control the screw pump to rotate based on the second target rotation speed to drive the die head to perform coating processing on the target device.

[0163] In some possible implementations, the operating parameters include a first rotation speed, a first surface density, and a time point; and the compensation determination unit is specifically configured to:

[0164] When the first surface density greater than the first threshold value exists in the at least one set of operating parameters, determining a target fitting function of the surface density according to at least one set of the first rotation speed, the first surface density and the time point;

[0165] Calculating the first surface density variation coefficient according to the target fitting function of the surface density;

[0166] The compensation value is obtained by fitting according to the first surface density variation coefficient and the die parameters.

[0167] In some possible implementations, the device includes:

[0168] The first loop module is used to return to the step of collecting at least one set of operating parameters and subsequent steps when all the first surface density values ​​in the at least one set of operating parameters are less than the first threshold value.

[0169] In some possible implementations, the device includes:

[0170] A speed collection module, used to collect the operating speeds of multiple groups of the screw pumps at preset time intervals;

[0171] The first update module is used to update the state of the control function to a closed state when the operating speeds of multiple groups of the screw pumps are greater than or equal to a second threshold and less than or equal to a third threshold; wherein the second threshold is used to indicate the minimum speed of the screw pump when the surface density reaches the first threshold, and the third threshold is used to indicate the maximum speed of the screw pump when the surface density reaches the first threshold.

[0172] In some possible implementations, the device includes:

[0173] The second circulation module is used for collecting at least one set of operating parameters when there is an operating speed less than the second threshold or greater than the third threshold among the multiple sets of operating speeds of the screw pumps, and determining the first target speed and subsequent steps based on the at least one set of operating parameters when the state of executing the control function in the coating machine is returned to the startup state.

[0174] In some possible implementations, the device includes:

[0175] A surface density acquisition module, used for acquiring a second surface density and determining a second surface density coefficient according to the second surface density; a first acquisition time of the second surface density is after a second acquisition time of the first surface density;

[0176] The second update module is used to update the state of the control function to a closed state when the second surface density coefficient is negatively correlated with time and the second surface density coefficient is less than a fourth threshold; wherein the fourth threshold is less than the first surface density coefficient and less than 1.

[0177] In some possible implementations, the device includes:

[0178] The third loop module is used to return to the start-up state of executing the control function in the coater when the second surface density coefficient is greater than or equal to the fourth threshold value, collect at least one set of operating parameters, and determine the first target speed and subsequent steps according to the at least one set of operating parameters until the second surface density coefficient is less than the fourth threshold value.

[0179] The screw pump control device provided in the embodiment of the present application can execute the method shown in the above method embodiment, and its implementation principle and beneficial effects are similar, which will not be repeated here.

[0180] Figure 8 This is a schematic diagram of the structure of the coating machine provided in the embodiment of the present application. Figure 8 As shown, the coating machine may include: a transceiver 21 , a processor 22 , a memory 23 , a screw pump 24 , and a die head 25 .

[0181] Optionally, the screw pump 24 is communicatively connected to the processor 22 , and the screw pump 24 is connected to the die head 25 .

[0182] The processor 22 executes the computer execution instructions stored in the memory, so that the processor 22 executes the scheme in the above embodiment. The processor 22 can be a general-purpose processor, including a central processing unit CPU, a network processor (NP), etc.; it can also be a digital signal processor DSP, an application-specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0183] The memory 23 is connected to the processor 22 via a system bus and completes communication between them. The memory 23 is used to store computer program instructions.

[0184] The transceiver 21 can be used to obtain operating parameters and the like.

[0185] The screw pump 24 is used to adjust the rotation speed according to the target to drive the die head to rotate.

[0186] The die head 25 is used to perform coating treatment on a target device by rotating.

[0187] The system bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The system bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The transceiver is used to realize the communication between the database access device and other computers (such as clients, read-write libraries, and read-only libraries). The memory may include random access memory (RAM) and may also include non-volatile memory.

[0188] An embodiment of the present application also provides a chip for running instructions, which is used to execute the technical solution of the screw pump control method in the above embodiment.

[0189] An embodiment of the present application also provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on a computer, the computer executes the technical solution of the screw pump control method in the above embodiment.

[0190] An embodiment of the present application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. At least one processor can read the computer program from the computer-readable storage medium. When at least one processor executes the computer program, the technical solution of the screw pump control method in the above embodiment can be implemented.

[0191] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0192] It should be further noted that, although the various steps in the flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0193] It should be understood that the above-mentioned device embodiments are only illustrative, and the device of the present application can also be implemented in other ways. For example, the division of units / modules in the above-mentioned embodiments is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0194] In addition, unless otherwise specified, each functional unit / module in each embodiment of the present application may be integrated into one unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of a software program module.

[0195] If the integrated unit / module is implemented in the form of hardware, the hardware may be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. If not specifically stated, the processor may be any appropriate hardware processor, such as a CPU, a GPU, an FPGA, a DSP, an ASIC, etc. If not specifically stated, the storage unit may be any appropriate magnetic storage medium or magneto-optical storage medium, such as a resistive random access memory RRAM (Resistive Random Access Memory), a dynamic random access memory DRAM (Dynamic Random Access Memory), a static random access memory SRAM (Static Random-Access Memory), an enhanced dynamic random access memory EDRAM (Enhanced Dynamic Random Access Memory), a high-bandwidth memory HBM (High-Bandwidth Memory), a hybrid memory cube HMC (Hybrid Memory Cube), etc.

[0196] If the integrated unit / module is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0197] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0198] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0199] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for controlling a screw pump, characterized in that: Applied to a coating machine, the coating machine includes a screw pump and a die head, and the method includes: When the initialization process of the coating machine is completed, obtaining the state of the control function in the coating machine; When the state of the control function in the coating machine is in the startup state, at least one set of operating parameters is collected, and a first target speed is determined according to the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold value; The screw pump is controlled to rotate based on the first target rotation speed to drive the die head to perform coating processing on the target device.

2. The method according to claim 1, characterized in that When the state of the control function in the coating machine is in the startup state, collecting at least one set of operating parameters, and determining a first target speed according to the at least one set of operating parameters, including: When the state of the control function indicates the start-up state, collecting at least one set of operating parameters and die parameters in the coating machine; Determining a first surface density variation coefficient according to the at least one set of operating parameters, and determining a compensation value of the screw pump according to the first surface density variation coefficient and the die head parameters; A first target rotation speed of the screw pump is calculated based on the compensation value.

3. The method according to claim 2, characterized in that After obtaining the state of the control function in the coating machine, the method further comprises: When the state of the control function indicates an off state, obtaining a preset compensation value; A second target rotation speed is calculated according to the preset compensation value, and the screw pump is controlled to rotate based on the second target rotation speed to drive the die head to perform coating processing on the target device.

4. The method according to claim 2, characterized in that: The operating parameters include a first rotation speed, a first surface density and a time point; the first surface density variation coefficient is determined according to the at least one set of operating parameters, and the compensation value of the screw pump is determined according to the first surface density variation coefficient and the die head parameters, including: When the first surface density greater than the first threshold value exists in the at least one set of operating parameters, determining a target fitting function of the surface density according to at least one set of the first rotation speed, the first surface density and the time point; Calculating the first surface density variation coefficient according to the target fitting function of the surface density; The compensation value is obtained by fitting according to the first surface density variation coefficient and the die parameters.

5. The method according to claim 4, characterized in that After collecting at least one set of operating parameters, the method further comprises: When, in the at least one set of operating parameters, each of the first surface density values ​​is less than the first threshold, the process returns to executing the steps of collecting at least one set of operating parameters and subsequent steps.

6. The method according to claim 1, characterized in that After controlling the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device, the method includes: Collecting the operating speeds of multiple groups of the screw pumps at preset time intervals; When the operating speeds of multiple groups of the screw pumps are greater than or equal to the second threshold and less than or equal to the third threshold, the state of the control function is updated to a closed state; wherein the second threshold is used to indicate the minimum speed of the screw pump when the surface density reaches the first threshold, and the third threshold is used to indicate the maximum speed of the screw pump when the surface density reaches the first threshold.

7. The method according to claim 6, characterized in that After collecting the operating speeds of the plurality of screw pumps, the method further comprises: When there is an operating speed less than the second threshold or greater than the third threshold among the multiple groups of operating speeds of the screw pump, when the state of executing the control function in the coating machine is returned to the startup state, at least one group of operating parameters are collected, and the first target speed and subsequent steps are determined according to the at least one group of operating parameters.

8. The method according to claim 1, characterized in that After the step of controlling the screw pump to rotate based on the first target speed to drive the die head to perform coating processing on the target device, the step includes: Collecting a second surface density, and determining a second surface density coefficient according to the second surface density; the first collection time of the second surface density is after the second collection time of the first surface density; When the second surface density coefficient is negatively correlated with time and the second surface density coefficient is less than a fourth threshold, the state of the control function is updated to a closed state; wherein the fourth threshold is less than the first surface density coefficient and less than 1.

9. The method according to claim 8, characterized in that After collecting the second surface density and determining the second surface density coefficient according to the second surface density, the method further comprises: When the second surface density coefficient is greater than or equal to the fourth threshold value, the state of executing the control function in the coater is returned to the startup state, at least one set of operating parameters is collected, and the first target speed and subsequent steps are determined according to the at least one set of operating parameters until the second surface density coefficient is less than the fourth threshold value.

10. A screw pump control device, characterized in that: Applied to a coating machine, the coating machine includes a screw pump and a die head, and the device includes: A data acquisition module, used for acquiring the status of the control function in the coating machine when the initialization process of the coating machine is completed; A determination module, used for collecting at least one set of operating parameters when the state of the control function in the coating machine is in the startup state, and determining a first target speed according to the at least one set of operating parameters; the first target speed is used to indicate the speed of the corresponding screw pump when the surface density reaches a first threshold value; The first control module is used to control the screw pump to rotate based on the first target rotation speed to drive the die head to perform coating processing on the target device.

11. A coating machine, characterized in that: include: A screw pump, a die head, a processor, and a memory in communication with the processor; The screw pump is connected to the die head, and the screw pump is used to adjust the rotation speed according to the target to drive the die head to rotate; The die head is used to perform coating treatment on the target device by rotation; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the screw pump control method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the screw pump control method according to any one of claims 1 to 9.

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