Multi-section speed control method and device for powder metering and discharging

Abstract

According to the multi-section speed control method and device for powder metering discharging, a discharging control system obtains the residual weight of powder in a powder storage hopper, then the discharging speed is determined according to the residual weight and a preset section speed control mapping table, then a discharging motor is controlled to work according to the discharging speed, and the discharging speed is controlled to be adjusted according to the discharging speed. The discharging speed is kept consistent with the target discharging speed of the current process stage; and finally, when it is detected that the residual weight reaches the preset residual weight, the current powder metering task is ended. Visibly, through the control logic of the residual weight of the powder and the multi-section speed discharging, the powder metering precision is effectively regulated and controlled, the problem of poor powder metering is effectively solved, then the accuracy of the powder ratio in the pulping process is ensured, raw material waste and production faults caused by metering errors are reduced, and the production efficiency is improved. And the reliability and economy of the whole lithium battery production process are enhanced.

Description

Technical Field

[0001] The present application belongs to the field of precision metering technology, and in particular relates to a multi-stage speed control method and device for powder metering and discharging. Background Art

[0002] In the lithium battery industry, powder metering accuracy is a common problem in production processes such as pulping and coating. This is especially true when processing powder materials with relatively poor fluidity or prone to agglomeration. High-speed discharge can easily cause localized accumulation or blockage, making it difficult to accurately control the actual discharge volume. This affects the uniformity of subsequent pulping and the stability of coating quality, thereby increasing production costs, reducing production efficiency, and hindering product quality. Summary of the Invention

[0003] The present application provides a multi-stage speed control method and device for powder metering and discharging. Through the control logic of the residual weight of the powder and the multi-stage speed discharging, the effective regulation of the powder metering accuracy is achieved, which effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0004] In the first aspect, an embodiment of the present application provides a multi-stage speed control method for powder metering and discharging, which is applied to a controller in a discharging control system, wherein the discharging control system also includes a weighing device, a discharging motor, a discharging pipe, and a powder storage hopper; the powder stored in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the residual weight of the powder in the powder storage hopper; the discharging motor is used to realize quantitative adjustment of the discharging speed of the powder; the method includes: obtaining the residual weight; determining the discharging speed according to the residual weight and a preset segmented speed control mapping table; the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharging speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharging weight and the target discharging weight is less than a preset weight difference; controlling the operation of the discharging motor according to the discharging speed so that the discharging speed is consistent with the target discharging speed of the current process stage; and terminating the current powder metering task when it is detected that the residual weight reaches the preset residual weight.

[0005] In the second aspect, an embodiment of the present application provides a multi-stage speed control method for powder metering and discharging, which is applied to a discharging control system, wherein the discharging control system includes a controller, a weighing device, a discharging motor, a discharging pipe, and a powder storage hopper; the powder in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; the discharging motor is used to control the discharging speed of the powder flowing out of the powder storage hopper; the method includes: obtaining a segmented speed control mapping table corresponding to the target discharging weight, the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharging speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharging weight and the target discharging weight is less than a preset weight difference; obtaining the remaining weight; detecting that the remaining weight is less than or equal to the first target remaining weight, and controlling the discharging motor to operate at the first target discharging speed; detecting that the remaining weight is less than or equal to the first target remaining weight, and controlling the discharging motor to operate at the first target discharging speed. If the residual weight is less than or equal to the second target residual weight, the discharging motor is controlled to operate at the second target discharging speed; if the residual weight is less than or equal to the third target residual weight, the discharging motor is controlled to operate at the third target discharging speed; if the residual weight is less than or equal to the fourth target residual weight, the discharging motor is controlled to operate at the fourth target discharging speed; if the residual weight is less than or equal to the fifth target residual weight, the discharging motor is controlled to operate at the fifth target discharging speed; if the residual weight reaches the target residual weight, the current powder metering task is ended; wherein, the first target residual weight < the second target residual weight < the third target residual weight < the fourth target residual weight < the fifth target residual weight; the first target discharging speed < the second target discharging speed < the third target discharging speed, the third target discharging speed > the fourth target discharging speed > the fifth target discharging speed.

[0006] On the third aspect, an embodiment of the present application provides a multi-stage speed control method for powder metering and discharging, which is applied to a discharging control system, wherein the discharging control system includes a controller, a weighing device, a discharging motor, a discharging pipe, a powder storage hopper and a display component; the powder in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; the discharging motor is used to control the discharging speed of the powder flowing out of the powder storage hopper; the method includes: displaying a discharging control page, the discharging control page includes a segmented speed control mapping relationship setting area, a start discharging task control, and the segmented speed control mapping relationship setting area is used to input a segmented speed The segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharging speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharging weight and the target discharging weight is less than the preset weight difference; detecting the user's triggering operation on the start discharging task control, sending a start discharging task instruction to the controller, and the start discharging task instruction is used to instruct the controller to start executing the discharging task and automatically switch the discharging speed according to the segmented mapping relationship table and the remaining weight; displaying the real-time discharging status page, and the real-time discharging status page is used to display the weight change curve of the remaining weight and the speed change curve of the discharging speed.

[0007] Fourthly, an embodiment of the present application provides a multi-stage speed control device for powder metering and discharging, which is applied to a controller in a discharging control system, wherein the discharging control system also includes a weighing device, a discharging motor, a discharging pipe, and a powder storage hopper; the powder stored in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the residual weight of the powder in the powder storage hopper; the discharging motor is used to realize quantitative adjustment of the discharging speed of the powder; the device includes: an acquisition unit for obtaining the residual weight; a processing unit for determining the discharging speed according to the residual weight and a preset segmented speed control mapping table; the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharging speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharging weight and the target discharging weight is less than a preset weight difference; and, the discharging motor is controlled to work according to the discharging speed; and, when it is detected that the residual weight reaches the target residual weight, the current powder metering task is ended.

[0008] In the fifth aspect, an embodiment of the present application provides a discharging control system, comprising a controller, a weighing device, a discharging motor, a discharging pipe, a powder storage hopper and a display assembly; the powder stored in the powder storage hopper flows out through the discharging pipe; the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; the discharging motor is used to achieve quantitative adjustment of the discharging speed of the powder; and the controller is used to execute the step instructions in the method as described in any one of the first aspects.

[0009] It can be seen that in the embodiment of the present application, the discharge control system obtains the residual weight of the powder in the powder storage hopper, and then determines the discharge speed according to the residual weight and the preset segmented speed control mapping table, wherein the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference; then, the discharge motor is controlled to work according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; finally, it is detected that the residual weight reaches the preset residual weight, and the current powder metering task is terminated. It can be seen that the present application realizes effective control of the powder metering accuracy through the control logic of the powder residual weight and multi-stage speed discharge, effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 A structural block diagram of the discharge control system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a discharge control system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of the controller provided in an embodiment of the present application; Figure 4 A schematic flow chart of a multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application; Figure 5 A schematic flow chart of another multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application; Figure 6 A schematic flow chart of another multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application; Figure 7 A schematic diagram of the discharge control page provided in an embodiment of the present application; Figure 8 A schematic diagram of the real-time status page of the discharge provided in the embodiment of the present application; Figure 9 A schematic diagram of a dynamically adjusted page provided in an embodiment of the present application; Figure 10 This is a functional unit structure block diagram of a multi-stage speed control device for powder metering and discharging provided in an embodiment of the present application. DETAILED DESCRIPTION

[0011] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0012] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may, in some embodiments, also include steps or elements not listed, or may, in some embodiments, include other steps or elements inherent to the process, method, product, or apparatus.

[0013] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0014] In the embodiments of this application, "and / or" describes the relationship between associated objects and indicates that three relationships can exist. For example, "A and / or B" can represent the following three situations: A exists alone; A and B exist simultaneously; and B exists alone. A and B can be singular or plural.

[0015] In the embodiments of the present application, the symbol " / " can indicate that the preceding and following objects are in an "or" relationship. In addition, the symbol " / " can also represent a division sign, that is, performing a division operation. For example, A / B can mean A divided by B.

[0016] In the embodiments of the present application, "at least one item" or similar expressions refers to any combination of these items, including any combination of single items or plural items, and refers to one or more, and multiple refers to two or more. For example, at least one item (item) of a, b, or c can represent the following seven situations: a, b, c, a and b, a and c, b and c, a, b, and c. Among them, each of a, b, and c can be an element or a set containing one or more elements.

[0017] In the embodiments of this application, "equal to" can be used in conjunction with "greater than" and is applicable to the technical solution adopted when "greater than" is used, and can also be used in conjunction with "less than" and is applicable to the technical solution adopted when "less than" is used. When "equal to" is used in conjunction with "greater than", it should not be used in conjunction with "less than"; when "equal to" is used in conjunction with "less than", it should not be used in conjunction with "greater than".

[0018] In the production process of slurrying, coating, etc. in the lithium battery industry, powder metering accuracy is a relatively common problem. The existing technology usually adopts a relatively single speed control mode when metering and discharging powders, which cannot adapt well to the flow characteristics of powders at different stages. As a result, when approaching the target metering value, metering accuracy is prone to exceed the tolerance. Especially when dealing with some powder materials with relatively poor fluidity or easy to agglomerate, high-speed discharge can easily cause local accumulation or blockage, making it difficult to accurately control the actual discharge volume, affecting the uniformity of subsequent slurrying and the quality stability of coating, thereby increasing production costs, reducing production efficiency and being detrimental to improving product quality.

[0019] In order to solve the above technical problems, the present application provides a multi-stage speed control method and device for powder metering and discharging. Through the control logic of the residual weight of the powder and the multi-stage speed discharging, the effective regulation of the powder metering accuracy is achieved, and the problem of powder metering difference is effectively solved, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0020] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. 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.

[0021] See also Figure 1-Figure 2 , Figure 1This is a structural block diagram of the discharge control system provided in the embodiment of the present application. Figure 2 The schematic diagram of the discharge control system provided in the embodiment of the present application includes a controller 11 , a weighing device 12 , a discharge motor 13 , a discharge pipe 15 , a powder storage hopper 16 and a display assembly 14 .

[0022] The powder storage hopper 16 is used to store powder, and the powder stored in the powder storage hopper 16 flows out through the discharge pipe 15 .

[0023] The discharge motor 13 supports multi-speed adjustment, enabling quantitative control of the powder discharge rate. The discharge rate (kg / min) is related to the speed of the discharge motor 13. For example, for a variable-frequency motor, the speed can be infinitely adjusted by varying the power supply frequency. Higher power supply frequencies and higher speeds correspond to faster discharge rates; lower power supply frequencies and lower speeds correspond to slower discharge rates. In one possible example, the discharge rate can be calculated based on the changes in the residual weight of the powder and the discharge time.

[0024] The weighing device 12 is used to obtain the remaining weight of the powder in the powder storage hopper 16. For example, the weighing device 12 is a strain gauge sensor with a measuring range of 0-1500 kg and an accuracy of ±0.1% FS.

[0025] Among them, the display component 14 includes at least one display screen, which can be a touch screen and / or a non-touch screen, such as a human-machine interface (HMI) touch screen, which is used to set preset thresholds for remaining weight and discharge speed, display real-time remaining weight, discharge speed, and issue alarms and other abnormal status prompts.

[0026] Among them, the controller 11, such as a PLC controller (programmable logic controller), is communicated with the weighing device 12, the discharge motor 13, and the display component 14, and is used to obtain real-time weight data of the weighing device 12, and to obtain and regulate the working status of the discharge motor 13, and to realize human-computer interaction through the display component 14.

[0027] For specific implementation, see Figure 3 , Figure 3 A schematic diagram of the structure of the controller provided in the embodiment of the present application is shown in FIG. Figure 3 As shown, the controller 11 includes a processor 1101, a memory 1103, a communication interface 1102, and one or more programs 11031. The one or more programs 11031 are stored in the memory 1103 and configured to be executed by the processor 1101. The one or more programs 11031 include instructions for executing any step in an embodiment of a multi-stage speed control method for powder metering and discharging.

[0028] Of course, the discharge control system 1 may also include more components, which are not limited here.

[0029] Based on the above system architecture, a multi-stage speed control method for powder metering and discharging is proposed in an embodiment of the present application.

[0030] See also Figure 4 , Figure 4 A schematic flow chart of a multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application, which is applied to Figure 1 The controller shown, such as Figure 4 As shown, the method includes the following steps S401 to S404: Step S401, obtaining the remaining weight.

[0031] The controller is connected to the weighing device in communication, and can obtain the remaining weight of the powder obtained by the weighing device in real time.

[0032] Step S402: determining the discharge speed according to the remaining weight and a preset segmented speed control mapping table.

[0033] Among them, the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed in different process stages. The segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference.

[0034] In some embodiments, the segmented speed control mapping table includes five process stages, namely the starting stage, the acceleration stage, the main discharging stage, the deceleration stage and the buffer stop stage; the target remaining weight in the starting stage, the acceleration stage, the main discharging stage, the deceleration stage and the buffer stop stage decreases in sequence; the target discharging speed from the starting stage to the main discharging stage increases in sequence, and the target discharging speed from the main discharging stage to the buffer stop stage decreases in sequence.

[0035] Among them, the segmented speed control mapping table includes five process stages, namely the target remaining weight and target discharge speed adapted to each process stage in the starting stage, acceleration stage, main discharge stage, deceleration stage and buffer stop stage.

[0036] In a possible example, the target discharging speed in the startup phase is 15% of the rated speed of the discharging motor; the target discharging speed in the acceleration phase is 35% of the rated speed; the target discharging speed in the main discharging phase is 60% of the rated speed; the target discharging speed in the deceleration phase is 30% of the rated speed; and the target discharging speed in the buffer stop phase is 5% of the rated speed.

[0037] As shown in Table 1 below, Table 1 is a segmented speed control mapping table provided in an embodiment of the present application.

[0038] Among them, before the startup phase, the residual weight is obtained to obtain the initial weight of the powder in the powder storage hopper, and the preset residual weight when the discharge is stopped is determined based on the initial weight and the target discharge weight; after startup, the discharge speed is automatically switched according to the residual weight according to the segmented speed control mapping table until the residual weight reaches the preset residual weight, ending the current powder metering task and starting the next work task as needed.

[0039] Based on the data provided in Table 1 above, the specific control logic flow is as follows: the initial weight is 1000 kg, the target discharge weight is 1000 kg, and the preset residual weight is 0. In the initial stage, the powder discharge speed is controlled to 15% of the rated speed; when the residual weight is detected to be less than 800 kg, the discharge speed is controlled to switch to 35% of the rated speed; when the residual weight is detected to be less than 500 kg, the discharge speed is controlled to switch to 60% of the rated speed; when the residual weight is detected to be less than 200 kg, the discharge speed is controlled to switch to 30% of the rated speed; when the residual weight is detected to be less than 50 kg, the discharge speed is controlled to switch to 5% of the rated speed, and the process continues until the residual weight is detected to be 0, ending the current powder metering task.

[0040] It can be seen that in this embodiment, the five-stage segmented speed control method can not only quickly output a large amount of material, but also accurately control when approaching the target value, so as to reduce the discharge error and improve the powder metering accuracy.

[0041] In some embodiments, the discharge speed is determined based on the remaining weight and a preset segmented speed control mapping table, including: determining the current process stage based on the remaining weight; obtaining the target discharge speed corresponding to the current process stage based on the segmented speed control mapping table; and determining the discharge speed to be the target discharge speed corresponding to the current process stage.

[0042] According to the example shown in Table 1 above, in this embodiment, when the residual weight detected in real time is compared with the target residual weight of different stages, the target discharging speed corresponding to the current residual weight is obtained. For example, when the residual weight is 840 kg, the target discharging speed is determined to be 15% of the rated speed, and the discharging and the real-time residual weight are continuously obtained. When the residual weight is less than or equal to 800 kg, the target discharging speed of the next process stage is switched to, and the discharging speed is continuously controlled according to the segmented speed control mapping table until the total amount of discharge reaches the target total amount of discharge, and the current discharging task is terminated.

[0043] In some embodiments, the process of establishing a segmented speed control mapping table is as follows: obtaining an initial segmented speed control mapping table based on the target discharge weight; obtaining the humidity and material density of the powder; dynamically adjusting the preset thresholds of the target remaining weight and / or target discharge speed in the initial segmented speed control mapping table based on the humidity and material density, so that the error between the actual discharge weight and the target total discharge weight is less than the preset weight difference.

[0044] The training process of the segmented speed control mapping table is as follows: for different target discharge weights, an initial segmented speed control mapping table is set. The initial segmented speed control mapping table contains the initial threshold values ​​for the weight and the discharge speed of each process stage. The initial threshold values ​​are adjusted according to the properties of the powder itself, such as humidity and material density, so that the error between the actual discharge weight and the target discharge weight is less than the preset weight difference. The association between the current powder properties and the adjusted segmented speed control mapping table is then established.

[0045] Therefore, the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference. That is to say, under ideal conditions, the controller controls the discharge speed switching according to the segmented speed control mapping table to ensure that the error between the output actual discharge weight and the target discharge weight is less than the preset weight difference.

[0046] Step S403: controlling the discharge motor to operate according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage. The discharge motor supports multi-speed adjustment, enabling quantitative control of the powder discharge speed. The discharge speed is related to the motor's speed. For example, with a variable-frequency motor, the speed can be infinitely adjusted by varying the power supply frequency. Higher power supply frequencies and higher speeds correspond to faster discharge speeds; lower power supply frequencies and lower speeds correspond to slower discharge speeds. In one possible example, the discharge speed can be calculated based on the changing powder residual weight and the discharge time.

[0047] Step S404: It is detected that the remaining weight reaches the target remaining weight, and the current powder weighing task is ended.

[0048] The target remaining weight is calculated based on the initial weight of the powder and the target discharge weight.

[0049] It can be seen that in the embodiment of the present application, the discharge control system obtains the residual weight of the powder in the powder storage hopper, and then determines the discharge speed according to the residual weight and the preset segmented speed control mapping table, wherein the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference; then, the discharge motor is controlled to work according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; finally, it is detected that the residual weight reaches the preset residual weight, and the current powder metering task is terminated. It can be seen that the present application realizes effective control of the powder metering accuracy through the control logic of the powder residual weight and multi-stage speed discharge, effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0050] In some embodiments, after controlling the operation of the discharge motor according to the discharge speed, the method further includes: obtaining the actual discharge speed of the powder in the discharge pipe in the current process stage; determining the speed error based on the actual discharge speed and the target discharge speed; when it is detected that the speed error exceeds the preset speed difference, dynamically adjusting the working parameters of the discharge motor so that the actual discharge speed is consistent with the target discharge speed, or, when the process stage is the process stage before the deceleration stage, determining the discharge speed to be the target discharge speed of the deceleration stage.

[0051] Among them, the actual discharge speed = the change in the remaining weight of the powder / time.

[0052] In this embodiment, the fluidity of the powder affects the speed of the discharge motor, causing the corresponding relationship between the motor speed and the powder discharge speed to change in real time, thereby causing a deviation between the actual discharge speed of the powder and the target discharge speed.

[0053] In one possible example, an encoder or sensor collects the actual motor speed in real time, calculating the actual speed deviation caused by the current material fluidity (e.g., a target speed of 1000 rpm, but the actual speed drops to 900 rpm due to material fluidity). Based on this deviation and its rate of change, the controller uses the PID algorithm to calculate the output values ​​of the proportional (P), integral (I), and differential (D) components. These values ​​are summed to produce the total control variable (e.g., the inverter's target frequency). For example, in the proportional component, the deviation multiplied by the proportional coefficient (P = 0.5) yields a 50% control variable; in the integral component, the accumulated deviation multiplied by the integral coefficient (I = 0.1) yields a 10% control variable; and in the differential component, the rate of change of the deviation multiplied by the differential coefficient (D = 0.2) yields a 20% control variable. The total control variable = 50% + 10% + 20% = 80%. Therefore, the inverter increases the motor frequency to 80% of the target value. The inverter or controller adjusts the discharge motor power supply parameters to change the speed to compensate for the fluidity deviation (e.g., increasing the speed to 1100 rpm to offset slower discharge caused by material viscosity). Continuously monitor the adjusted speed and discharge volume, and repeat the above process until the deviation is eliminated and a dynamic balance is achieved.

[0054] In another example, if the deviation is too large before entering the deceleration phase, it indicates that the powder flowability has a significant impact on the motor. If corrected using the conventional PID algorithm, it may prolong the abnormal motor operation time, further amplify the deviation, and cause excessive material accumulation. In this case, a more effective solution is to directly enter the deceleration phase, set the discharge speed to the target discharge speed for the deceleration phase, and then adjust the motor frequency based on the target discharge speed for the deceleration phase to reduce the motor speed.

[0055] It can be seen that in this embodiment, when there is a difference between the actual discharging speed and the target discharging speed, the PID algorithm can be used to dynamically adjust the motor speed to compensate for the difference in material fluidity, and the motor speed can be adjusted in real time to offset the impact of changes in material fluidity on the discharging speed; on the other hand, when the difference is too large, such as material agglomeration and blockage, direct control is used to jump from the current process stage to the deceleration stage, shortening the adjustment time, avoiding excessive accumulation of materials, and improving response efficiency.

[0056] In summary, the above two methods are combined to adjust the abnormalities in the discharging process. The PID algorithm maintains the stability of the system under small disturbances through continuous fine-tuning, and the stage jump breaks through the constraints of traditional processes through discrete mutations to cope with large disturbances. The combination of the two realizes the accuracy guarantee of the entire process from micro to macro.

[0057] For the same example as above, please refer to Figure 5 , Figure 5 A schematic flow chart of another multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application is shown as follows: Figure 5 As shown, the method includes the following steps S501 to S508: Step S501: Obtain a segmented speed control mapping table corresponding to the target discharge weight.

[0058] Among them, the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed in different process stages. The segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference.

[0059] Step S502: Obtain the remaining weight. Step S503: When it is detected that the remaining weight is less than or equal to the first target remaining weight, the discharge motor is controlled to operate at the first target discharge speed.

[0060] Step S504: When it is detected that the remaining weight is less than or equal to the second target remaining weight, the discharge motor is controlled to operate at the second target discharge speed.

[0061] Step S505 , detecting that the remaining weight is less than or equal to the third target remaining weight, and controlling the discharge motor to operate at the third target discharge speed.

[0062] Step S506: When it is detected that the remaining weight is less than or equal to the fourth target remaining weight, the discharging motor is controlled to operate at the fourth target discharging speed.

[0063] Step S507: If it is detected that the remaining weight is less than or equal to the fifth target remaining weight, the discharging motor is controlled to operate at the fifth target discharging speed.

[0064] Step S508: It is detected that the remaining weight reaches the target remaining weight, and the current powder weighing task is ended.

[0065] Among them, the first target remaining weight is less than the second target remaining weight, the third target remaining weight is less than the fourth target remaining weight, and the fifth target remaining weight is less than the first target discharging speed, the second target discharging speed is less than the third target discharging speed, and the third target discharging speed is greater than the fourth target discharging speed and greater than the fifth target discharging speed.

[0066] In some embodiments, the fifth target discharging speed belongs to a preset target low-speed range, and the target low-speed range is the speed at which the discharging motor stably operates in the final stage of the current powder metering task.

[0067] Among them, when the remaining weight reaches the fifth target remaining weight, it means that the amount of powder in the powder storage hopper has reached a small state. At this time, the powder metering task enters the final buffer stop stage. In the final stage, the discharging speed of the discharging motor is stably controlled within the preset target low-speed range (such as the target low-speed range is 10% < rated speed < 0, and the fifth target discharging speed can be 5%), thereby completing the final buffer stop process until it is detected that the remaining weight reaches the target remaining weight (such as a number close to 0), and the discharging motor is controlled to stop working.

[0068] In some embodiments, the process of establishing a segmented speed control mapping table is as follows: obtaining an initial segmented speed control mapping table based on the target discharge weight; obtaining the humidity and material density of the powder; dynamically adjusting the preset thresholds of the target remaining weight and / or target discharge speed in the initial segmented speed control mapping table based on the humidity and material density, so that the error between the actual discharge weight and the target total discharge weight is less than the preset weight difference.

[0069] The training process of the segmented speed control mapping table is as follows: for different target discharge weights, an initial segmented speed control mapping table is set. The initial segmented speed control mapping table contains the initial threshold values ​​for the weight and the discharge speed of each process stage. The initial threshold values ​​are adjusted according to the properties of the powder itself, such as humidity and material density, so that the error between the actual discharge weight and the target discharge weight is less than the preset weight difference. The association between the current powder properties and the adjusted segmented speed control mapping table is then established.

[0070] Therefore, the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference. That is to say, under ideal conditions, the controller controls the discharge speed switching according to the segmented speed control mapping table to ensure that the error between the output actual discharge weight and the target discharge weight is less than the preset weight difference.

[0071] In some embodiments, after controlling the operation of the discharge motor according to the discharge speed, the method further includes: obtaining the actual discharge speed of the powder in the discharge pipe in the current process stage; determining the speed error based on the actual discharge speed and the target discharge speed; when it is detected that the speed error exceeds the preset speed difference, dynamically adjusting the working parameters of the discharge motor so that the actual discharge speed is consistent with the target discharge speed, or, when the process stage is the process stage before the deceleration stage, determining the discharge speed to be the target discharge speed of the deceleration stage.

[0072] Among them, the actual discharge speed = the change in the remaining weight of the powder / time.

[0073] In this embodiment, the fluidity of the powder affects the speed of the discharge motor, causing the corresponding relationship between the motor speed and the powder discharge speed to change in real time, thereby causing a deviation between the actual discharge speed of the powder and the target discharge speed.

[0074] In one possible example, an encoder or sensor collects the actual motor speed in real time, calculating the actual speed deviation caused by the current material fluidity (e.g., a target speed of 1000 rpm, but the actual speed drops to 900 rpm due to material fluidity). Based on this deviation and its rate of change, the controller uses the PID algorithm to calculate the output values ​​of the proportional (P), integral (I), and differential (D) components. These values ​​are summed to produce the total control variable (e.g., the inverter's target frequency). For example, in the proportional component, the deviation multiplied by the proportional coefficient (P = 0.5) yields a 50% control variable; in the integral component, the accumulated deviation multiplied by the integral coefficient (I = 0.1) yields a 10% control variable; and in the differential component, the rate of change of the deviation multiplied by the differential coefficient (D = 0.2) yields a 20% control variable. The total control variable = 50% + 10% + 20% = 80%. Therefore, the inverter increases the motor frequency to 80% of the target value. The inverter or controller adjusts the discharge motor power supply parameters to change the speed to compensate for the fluidity deviation (e.g., increasing the speed to 1100 rpm to offset slower discharge caused by material viscosity). Continuously monitor the adjusted speed and discharge volume, and repeat the above process until the deviation is eliminated and a dynamic balance is achieved.

[0075] In another example, if the deviation is too large before entering the deceleration phase, it indicates that the powder flowability has a significant impact on the motor. If corrected using the conventional PID algorithm, it may prolong the abnormal motor operation time, further amplify the deviation, and cause excessive material accumulation. In this case, a more effective solution is to directly enter the deceleration phase, set the discharge speed to the target discharge speed for the deceleration phase, and then adjust the motor frequency based on the target discharge speed for the deceleration phase to reduce the motor speed.

[0076] It can be seen that in this embodiment, when there is a difference between the actual discharging speed and the target discharging speed, the PID algorithm can be used to dynamically adjust the motor speed to compensate for the difference in material fluidity, and the motor speed can be adjusted in real time to offset the impact of changes in material fluidity on the discharging speed; on the other hand, when the difference is too large, such as material agglomeration and blockage, direct control is used to jump from the current process stage to the deceleration stage, shortening the adjustment time, avoiding excessive accumulation of materials, and improving response efficiency.

[0077] In summary, the above two methods are combined to adjust the abnormalities in the discharging process. The PID algorithm maintains the stability of the system under small disturbances through continuous fine-tuning, and the stage jump breaks through the constraints of traditional processes through discrete mutations to cope with large disturbances. The combination of the two realizes the accuracy guarantee of the entire process from micro to macro.

[0078] It can be seen that in the embodiment of the present application, the discharge control system obtains the residual weight of the powder in the powder storage hopper, and then determines the discharge speed according to the residual weight and the preset segmented speed control mapping table, wherein the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference; then, the discharge motor is controlled to work according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; finally, it is detected that the residual weight reaches the preset residual weight, and the current powder metering task is terminated. It can be seen that the present application realizes effective control of the powder metering accuracy through the control logic of the powder residual weight and multi-stage speed discharge, effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0079] See also Figure 6 , Figure 6 A schematic flow chart of another multi-stage speed control method for powder metering and discharging provided in an embodiment of the present application, the method comprising steps S601 to S603: Step S601: Display the material control page.

[0080] Among them, the discharging control page includes a segmented speed control mapping relationship setting area and a start discharging task control. The segmented speed control mapping relationship setting area is used to input the segmented speed control mapping table. The segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharging speed in different process stages. The segmented speed control mapping table is used to indicate the state where the error between the actual discharging weight and the target discharging weight is less than the preset weight difference.

[0081] For specific implementation, please refer to Figure 7 , Figure 7 This is a schematic diagram of the discharge control page provided in the embodiment of the present application, as shown in FIG. Figure 7 As shown, the discharge control page 7 includes a segmented speed control mapping relationship setting area 71. This segmented speed control mapping relationship setting area 71 is used to set a segmented speed control mapping table. The segmented speed control mapping table includes target remaining weights and target discharge speeds corresponding to different process stages. After the user enters the segmented speed control mapping table, the background controller controls and switches the discharge speeds for different process stages according to the segmented speed control mapping table.

[0082] Step S602: Detecting the user's triggering operation on the start discharging task control, and sending a start discharging task instruction to the controller.

[0083] Among them, the start discharging task instruction is used to instruct the controller to start executing the discharging task and automatically switch the discharging speed according to the segment mapping relationship table and the remaining weight.

[0084] For specific implementation, see Figure 7 The discharge control page 7 also includes a start discharge task control 72. After the user inputs the segmented speed control mapping table, he clicks the start discharge task control 72 to start the discharge task and the powder begins to be transported.

[0085] Step S603: Displaying a real-time status page of material feeding. The real-time status page of material discharging is used to display a weight change curve of the remaining weight and a speed change curve of the material discharging speed.

[0086] For specific implementation, please refer to Figure 8 , Figure 8 This is a schematic diagram of the real-time status page of the discharge provided in the embodiment of the present application, as shown in FIG. Figure 8 As shown, the real-time discharge status page 8 displays a weight change curve of the remaining weight of the powder in the powder storage hopper, as well as a speed change curve of the discharge speed. The weight change curve reflects the target remaining weight and real-time remaining weight data for each process step; the speed change curve reflects the target discharge speed and real-time discharge speed for each process environment. The real-time discharge status page allows users to monitor weight and speed changes during the discharge process and detect abnormalities in a timely manner.

[0087] In some embodiments, when it is detected that the difference between the actual discharge speed and the target discharge speed is greater than a preset speed difference, a dynamic adjustment page is displayed, which is used to increase or decrease the target remaining weight and / or the target discharge speed.

[0088] For specific implementation, please refer to Figure 9 , Figure 9 A schematic diagram of a dynamically adjusted page provided in an embodiment of the present application is shown in FIG. Figure 9 As shown in the figure, when the deviation between the actual discharge speed and the target discharge speed in any process stage is large, the user can directly Figure 8 Click on the process stage that needs to be modified on the real-time discharge status page shown, and the dynamic adjustment page 91 will be displayed. The dynamic adjustment page 91 includes adjustment controls for the target remaining weight and target discharge speed of the process stage that needs to be modified. Through the adjustment controls, the user can modify the preset thresholds of the target remaining weight and / or target discharge speed.

[0089] Among them, the fluidity of the powder will affect the speed of the discharge motor, resulting in real-time changes in the corresponding relationship between the motor speed and the powder discharge speed, which in turn causes the actual discharge speed of the powder to deviate from the target discharge speed. In some embodiments, the controller uses a PID algorithm to automatically control the dynamic adjustment of the target discharge speed. In some embodiments, the user manually increases or decreases the change in the target discharge speed according to the speed change curve. In some embodiments, when it is detected that the deviation between the actual discharge speed and the target discharge speed is greater than the second preset speed difference, the discharge speed of the current process stage is switched to the target discharge speed of the deceleration stage to shorten the abnormal working time of the motor and reduce the difference between the actual discharge speed and the target discharge speed.

[0090] It can be seen that in the embodiment of the present application, the discharge control system obtains the residual weight of the powder in the powder storage hopper, and then determines the discharge speed according to the residual weight and the preset segmented speed control mapping table, wherein the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference; then, the discharge motor is controlled to work according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; finally, it is detected that the residual weight reaches the preset residual weight, and the current powder metering task is terminated. It can be seen that the present application realizes effective control of the powder metering accuracy through the control logic of the powder residual weight and multi-stage speed discharge, effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0091] The above mainly introduces the solution of the embodiment of the present application from the perspective of the execution process of the method side. It is understandable that, in order to realize the above functions, the server includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiment provided herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0092] The embodiments of the present application can divide the server into functional units according to the above method examples. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into a processing module. The above integrated units can be implemented in the form of hardware or in the form of software program modules. It should be noted that the division of units in the embodiments of the present application is schematic and is only a logical functional division. In actual implementation, other division methods can be used.

[0093] In the case of integrated units, see Figure 10 , Figure 10 This is a functional unit structure diagram of a multi-stage speed control device for powder metering and discharging provided in an embodiment of the present application, such as Figure 10 As shown, the multi-stage speed control device 10 for powder metering and discharging includes: An acquiring unit 101 is used to acquire the remaining weight; The processing unit 102 is used to determine the discharge speed according to the remaining weight and a preset segmented speed control mapping table; the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharge weight and the target discharge weight is less than a preset weight difference; and, control the operation of the discharge motor according to the discharge speed; and, upon detecting that the remaining weight reaches the target remaining weight, end the current powder metering task.

[0094] It can be seen that in the embodiment of the present application, the discharge control system obtains the residual weight of the powder in the powder storage hopper, and then determines the discharge speed according to the residual weight and the preset segmented speed control mapping table, wherein the segmented speed control mapping table is a mapping relationship between the target residual weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate the state where the error between the actual discharge weight and the target discharge weight is less than the preset weight difference; then, the discharge motor is controlled to work according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; finally, it is detected that the residual weight reaches the preset residual weight, and the current powder metering task is terminated. It can be seen that the present application realizes effective control of the powder metering accuracy through the control logic of the powder residual weight and multi-stage speed discharge, effectively solves the problem of powder metering error, thereby ensuring the accuracy of the powder ratio in the pulping process, reducing the waste of raw materials and production failures caused by metering errors, and enhancing the reliability and economy of the entire lithium battery production process.

[0095] In some embodiments, the segmented speed control mapping table includes five process stages, namely the starting stage, the acceleration stage, the main discharging stage, the deceleration stage and the buffer stop stage; the target remaining weight in the starting stage, the acceleration stage, the main discharging stage, the deceleration stage and the buffer stop stage decreases in sequence; the target discharging speed from the starting stage to the main discharging stage increases in sequence, and the target discharging speed from the main discharging stage to the buffer stop stage decreases in sequence.

[0096] In some embodiments, the target discharging speed in the startup phase is 15% of the rated speed of the discharging motor; the target discharging speed in the acceleration phase is 35% of the rated speed; the target discharging speed in the main discharging phase is 60% of the rated speed; the target discharging speed in the deceleration phase is 30% of the rated speed; and the target discharging speed in the buffer stop phase is 5% of the rated speed.

[0097] In some embodiments, the processing unit 102 determines the discharge speed based on the remaining weight and a preset segmented speed control mapping table, including: determining the current process stage based on the remaining weight; obtaining the target discharge speed corresponding to the current process stage based on the segmented speed control mapping table; and determining the discharge speed to be the target discharge speed corresponding to the current process stage.

[0098] In some embodiments, the process of establishing a segmented speed control mapping table is as follows: obtaining an initial segmented speed control mapping table based on the target discharge weight; obtaining the humidity and material density of the powder; dynamically adjusting the preset thresholds of the target remaining weight and / or target discharge speed in the initial segmented speed control mapping table based on the humidity and material density, so that the error between the actual discharge weight and the target total discharge weight is less than the preset weight difference.

[0099] In some embodiments, after the processing unit 102 controls the operation of the discharge motor according to the discharge speed, the processing unit 102 is also used to: obtain the actual discharge speed of the powder in the discharge pipe in the current process stage; determine the speed error based on the actual discharge speed and the target discharge speed; when it is detected that the speed error exceeds the preset speed difference, dynamically adjust the working parameters of the discharge motor so that the actual discharge speed is consistent with the target discharge speed, or, when the process stage is the process stage before the deceleration stage, determine the discharge speed to be the target discharge speed of the deceleration stage.

[0100] An embodiment of the present application provides a computer-readable storage medium having a computer program / instruction stored thereon. When the computer program / instruction is executed by a processor, the steps of any possible embodiment method are implemented.

[0101] 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 this application is not limited by the order of the actions described, because according to this 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 preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0102] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0104] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0105] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0106] If the above-mentioned integrated unit is implemented in the form of a software functional unit 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 existing technology, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a memory and includes a number of instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the above-mentioned methods in each embodiment 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, magnetic disk or optical disk, etc. Various media that can store program code.

[0107] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by a program instructing related hardware. The program can be stored in a computer-readable memory, which may include a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0108] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A multi-stage speed control method for powder metering and discharging, characterized in that: A controller used in a discharge control system, the discharge control system further comprising a weighing device, a discharge motor, a discharge pipe, and a powder storage hopper; the powder stored in the powder storage hopper flows out through the discharge pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; The discharging motor is used to achieve quantitative adjustment of the discharging speed of the powder; the method includes: obtaining the remaining weight; The discharge speed is determined according to the remaining weight and a preset segmented speed control mapping table; the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharge weight and the target discharge weight is less than a preset weight difference; Controlling the discharge motor to operate according to the discharge speed so that the discharge speed is consistent with the target discharge speed of the current process stage; When it is detected that the remaining weight reaches the preset remaining weight, the current powder measuring task is ended.

2. The method according to claim 1, characterized in that The segmented speed control mapping table includes five process stages, namely the startup stage, the acceleration stage, the main discharge stage, the deceleration stage and the buffer stop stage; The target residual weights of the startup phase, the acceleration phase, the main discharging phase, the deceleration phase, and the buffer stop phase decrease in sequence; The target discharging speed from the startup stage to the main discharging stage increases successively, and the target discharging speed from the main discharging stage to the buffer stop stage decreases successively.

3. The method according to claim 2, characterized in that The target discharging speed in the startup phase is 15% of the rated speed of the discharging motor; the target discharging speed in the acceleration phase is 35% of the rated speed; the target discharging speed in the main discharging phase is 60% of the rated speed; the target discharging speed in the deceleration phase is 30% of the rated speed; and the target discharging speed in the buffer stop phase is 5% of the rated speed.

4. The method according to claim 2, characterized in that The step of determining the discharge speed according to the remaining weight and a preset segmented speed control mapping table includes: determining a current process stage based on the remaining weight; Obtaining the target discharge speed corresponding to the current process stage according to the segmented speed control mapping table; The discharge speed is determined to be the target discharge speed corresponding to the current process stage.

5. The method according to claim 1, wherein The process of establishing the segmented speed control mapping table is as follows: Obtaining an initial segmented speed control mapping table according to the target discharge weight; Obtaining the humidity and material density of the powder; The preset thresholds of the target remaining weight and / or target discharge speed in the initial segmented speed control mapping table are dynamically adjusted according to the humidity and material density, so that the error between the actual discharge weight and the target total discharge weight is less than the preset weight difference.

6. The method according to claim 4, characterized in that After controlling the discharging motor to operate according to the discharging speed, the method further includes: Obtaining an actual discharge speed of the powder in the discharge pipe at the current process stage; Determining a speed error based on the actual discharge speed and the target discharge speed; When it is detected that the speed error exceeds a preset speed difference, the working parameters of the discharge motor are dynamically adjusted so that the actual discharge speed is consistent with the target discharge speed. Alternatively, when the process stage is the process stage before the deceleration stage, the discharge speed is determined to be the target discharge speed of the deceleration stage.

7. A multi-stage speed control method for powder metering and discharging, characterized in that: Applied to a discharging control system, the discharging control system includes a controller, a weighing device, a discharging motor, a discharging pipe, and a powder storage hopper; the powder in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; The discharge motor is used to control the discharge speed of the powder flowing out of the powder storage hopper; The method comprises: Obtaining a segmented speed control mapping table corresponding to the target discharge weight, wherein the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed at different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharge weight and the target discharge weight is less than a preset weight difference; obtaining the remaining weight; detecting that the remaining weight is less than or equal to a first target remaining weight, controlling the discharging motor to operate at a first target discharging speed; detecting that the remaining weight is less than or equal to a second target remaining weight, controlling the discharging motor to operate at a second target discharging speed; detecting that the remaining weight is less than or equal to a third target remaining weight, controlling the discharging motor to operate at a third target discharging speed; detecting that the remaining weight is less than or equal to a fourth target remaining weight, controlling the discharging motor to operate at a fourth target discharging speed; detecting that the remaining weight is less than or equal to a fifth target remaining weight, controlling the discharging motor to operate at a fifth target discharging speed; When it is detected that the remaining weight reaches the target remaining weight, the current powder metering task is ended; Wherein, the first target remaining weight < the second target remaining weight < the third target remaining weight < the fourth target remaining weight < the fifth target remaining weight; The first target discharging speed is less than the second target discharging speed and less than the third target discharging speed, and the third target discharging speed is greater than the fourth target discharging speed and greater than the fifth target discharging speed.

8. The method according to claim 7, characterized in that The fifth target discharging speed belongs to a preset target low-speed range, and the target low-speed range is the speed at which the discharging motor stably operates in the final stage of the current powder metering task.

9. A multi-stage speed control method for powder metering and discharging, characterized in that: Applied to a discharging control system, the discharging control system includes a controller, a weighing device, a discharging motor, a discharging pipe, a powder storage hopper and a display component; the powder in the powder storage hopper flows out through the discharging pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; The discharge motor is used to control the discharge speed of the powder flowing out of the powder storage hopper; the method includes: Displaying a discharging control page, which includes a segmented speed control mapping relationship setting area and a start discharging task control. The segmented speed control mapping relationship setting area is used to input a segmented speed control mapping table, which is a mapping relationship between target remaining weight and target discharging speed in different process stages. The segmented speed control mapping table is used to indicate a state where the error between the actual discharging weight and the target discharging weight is less than a preset weight difference; detecting a user triggering operation on the start discharging task control, and sending a start discharging task instruction to the controller, wherein the start discharging task instruction is used to instruct the controller to start executing the discharging task and automatically switch the discharging speed according to the segment mapping relationship table and the remaining weight; A real-time discharging status page is displayed, wherein the real-time discharging status page is used to display a weight change curve of the remaining weight and a speed change curve of the discharging speed.

10. A multi-stage speed control device for powder metering and discharging, characterized in that: A controller used in a discharge control system, the discharge control system further comprising a weighing device, a discharge motor, a discharge pipe, and a powder storage hopper; the powder stored in the powder storage hopper flows out through the discharge pipe, and the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; The discharging motor is used to achieve quantitative adjustment of the discharging speed of the powder; the device includes: an acquiring unit, configured to acquire the remaining weight; A processing unit is used to determine the discharge speed according to the remaining weight and a preset segmented speed control mapping table; the segmented speed control mapping table is a mapping relationship between the target remaining weight and the target discharge speed in different process stages, and the segmented speed control mapping table is used to indicate a state where the error between the actual discharge weight and the target discharge weight is less than a preset weight difference; and, control the operation of the discharge motor according to the discharge speed; and, upon detecting that the remaining weight reaches the target remaining weight, end the current powder metering task.

11. A discharging control system, characterized in that: It includes a controller, a weighing device, a discharge motor, a discharge pipe, a powder storage hopper and a display component; the powder stored in the powder storage hopper flows out through the discharge pipe; the weighing device is used to obtain the remaining weight of the powder in the powder storage hopper; the discharge motor is used to achieve quantitative adjustment of the discharge speed of the powder; the controller is used to execute the step instructions in the method as described in any one of claims 1 to 6.

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