Energy-saving control method, system and storage medium for multi-frequency vibrating screen

Abstract

The present invention discloses an energy-saving control method, system and storage medium for a multi-frequency vibrating screen, which belongs to the field of vibrating screen control. The method includes: a start-stop module sends a start instruction to a control module; after receiving the start instruction, the control module controls the first motor and the second motor to start at the same time, and the second motor is powered by an energy storage battery when starting; after a preset condition is met, the control module stops the second motor; the sensor module detects the material parameters in the vibrating screen at intervals of a first time length, and sends the material parameters to the analysis module; the analysis module adjusts the start and stop of the second motor based on the material parameters; after the start-stop module sends a stop instruction to the control module, the control module stops the first motor and the second motor. The present invention can not only ensure the normal operation of the vibrating screen, but also reduce the energy consumption of the vibrating screen.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibrating screen control, and in particular relates to an energy-saving control method, system and storage medium for a multi-frequency vibrating screen. Background Art

[0002] The multi-frequency vibrating screen is a commonly used solid-liquid or solid-solid separation equipment. When in use, the motor shaft of the multi-frequency vibrating screen is connected to the exciter through a flat belt or a transmission shaft. When the power is turned on, the motor shaft drives the exciter to generate an exciting force to make the vibrating screen vibrate at a certain amplitude and frequency. Traditional vibrating screens have high energy consumption during operation. In order to solve this problem, the prior art has also proposed a variety of methods to reduce the energy consumption of vibrating screens, such as the Chinese patent document with publication number CN110936520A, which discloses an energy-saving and environmentally friendly vibrating screening device for new material production, or the Chinese patent document with publication number CN108273726A, which discloses a high-efficiency vibrating screening machine.

[0003] However, both of the above solutions achieve the purpose of reducing the energy consumption of the vibrating screen by improving the structure of the vibrating screen. Generally, the vibrating screen requires a large starting power when starting, so a large-power motor needs to be set to meet this requirement. However, after starting, the vibrating screen does not need such a large starting power to maintain operation, and the power of the motor is fixed and cannot be adjusted. Therefore, the vibrating screen will use a motor with a power exceeding its required power to maintain operation, which will result in power waste, and structural improvements cannot solve this problem. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an energy-saving control method, system and storage medium for a multi-frequency vibrating screen to solve the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention proposes an energy-saving control method for a multi-frequency vibrating screen, comprising:

[0006] When the vibrating screen is in a stopped state, the start-stop module sends a start command to the control module;

[0007] After receiving the start instruction, the control module controls the first motor and the second motor to start simultaneously, the first motor and the second motor are arranged on one side of the vibrating screen, the first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by an energy storage battery connected thereto;

[0008] A plurality of preset conditions are set, and when one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity, so as to charge the energy storage battery;

[0009] The sensor module detects the state of the first motor and the material parameters in the vibrating screen at a first time interval, and sends the state of the first motor and the material parameters to the analysis module;

[0010] The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters;

[0011] After the start-stop module sends a stop instruction to the control module, the control module stops the first motor and the second motor.

[0012] Furthermore, the analysis module adjusts the start and stop of the second motor and the vibrating screen, including the following steps:

[0013] The analysis module is provided with a start condition and a plurality of representative parameters, each representative parameter is provided with a corresponding judgment condition, and the analysis module selects the representative parameter from the received material parameters, and if the first motor is in an overload state and satisfies the start condition, or if the representative parameter satisfies the judgment condition and the second motor is in a stopped state, the analysis module generates a first instruction to start the second motor;

[0014] If all of the representative parameters do not satisfy the judgment condition and the second motor is in a started state, the analysis module generates a second instruction to stop the second motor.

[0015] Further, determining the representative parameter comprises the following steps:

[0016] Collecting first historical data of various material parameters during the operation of the vibrating screen when the second motor is stopped, removing abnormal data from the first historical data to obtain second historical data, and constructing various basic equations on the screening efficiency of the vibrating screen based on the second historical data, wherein the basic equations are multiple linear regression equations, and different basic equations include different material parameters;

[0017] Calculate the score of each basic equation, eliminate the basic equations with scores less than a first threshold to obtain a prediction equation, assign the score of the prediction equation to each material parameter included in it as the basic score of the material parameter, add up all the basic scores obtained by the material parameters to obtain a total score, sort the total scores from large to small, and select the material parameters corresponding to the first M total scores as the representative parameters.

[0018] Further, calculating the score of the basic equation comprises the following steps:

[0019] Select multiple pieces of the second historical data, define the time period for generating the second historical data as a test time period, calculate the actual screening efficiency in each piece of the second historical data, extract one of the basic equations to define as a test equation, locate the test parameters included in the test equation, calculate the predicted screening efficiency at each test time point based on the test parameters and the test equation, and calculate the score R of the test equation based on the first formula, the first formula being: , where Ei is the actual screening efficiency of the vibrating screen in the i-th test time period, j is the number of the test time periods, Fi is the predicted screening efficiency of the i-th test time period calculated by the test equation, and μ is the average value of all the predicted screening efficiencies.

[0020] Further, determining the judgment condition of each representative parameter includes the following steps:

[0021] Select one of the representative parameters as the parameter to be analyzed, select multiple second historical data as the data to be analyzed, except for the parameter to be analyzed, the differences in the numerical values ​​of the same type of the representative parameters between the data to be analyzed are all within a preset range, calculate the actual screening efficiency of each of the second historical data, draw a trend curve of the actual screening efficiency changing with the parameter to be analyzed, obtain the maximum curvature point in the trend curve, set the numerical value of the parameter to be analyzed corresponding to the maximum curvature point as the corresponding second threshold value, if the trend curve is a downward trend, set the judgment condition to be that the representative parameter is less than the second threshold value, otherwise set the judgment condition to be that the representative parameter is greater than or equal to the second threshold value.

[0022] Furthermore, the preset condition includes that the startup time of the first motor reaches a second time, and the current value of the first motor returns to normal after startup.

[0023] Furthermore, removing the abnormal data from the first historical data includes the following steps:

[0024] The material parameters of the same type in the first historical data are divided into a first data group, the material parameters with adjacent collection times are extracted from the first data group to construct a second data group, the material parameters in the second data group are sorted from small to large, and the median thereof is located, one material parameter is extracted from the second data group as the target data, the direction of the target data toward the median is taken as the positive sequence direction, and K material parameters other than the median are extracted along the positive sequence direction with the target data as the starting point;

[0025] The deviation value U of the target data is calculated based on a second formula, where the second formula is: , where Dx is the target data, Dx+1 is the material parameter adjacent to the target data in the positive sequence direction, and Dk is the kth material parameter extracted along the positive sequence direction. When the deviation value exceeds the critical value, the target data is defined as an abnormal value and deleted.

[0026] The present invention also provides an energy-saving control system for a multi-frequency vibrating screen, which is used to implement the energy-saving control method for a multi-frequency vibrating screen described above, and the system comprises:

[0027] A start-stop module, when the vibrating screen is in a stopped state, the start-stop module is used to send a start instruction and a stop instruction to the control module;

[0028] A control module controls the first motor and the second motor to start simultaneously after receiving the start instruction, wherein the first motor and the second motor are arranged on one side of the vibrating screen, the first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by an energy storage battery connected thereto, and multiple preset conditions are set. After one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity to charge the energy storage battery. After receiving the stop instruction, the control module stops the first motor and the second motor;

[0029] A sensor module, configured to detect a state of the first motor and a material parameter in the vibrating screen at a first time interval, and send the state of the first motor and the material parameter to an analysis module;

[0030] The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters.

[0031] The present invention also discloses a computer storage medium, wherein the computer storage medium stores program instructions, wherein when the program instructions are executed, the device where the computer storage medium is located is controlled to execute the above-mentioned method.

[0032] Compared with the prior art, the beneficial effects of the present invention are at least as follows:

[0033] The present invention provides a large starting power by starting the first motor and the second motor at the same time on the basis of setting two motors, so as to meet the starting requirements of the vibrating screen. When the vibrating screen is running, the vibrating screen is used to drive the second motor to generate electricity, so as to charge the energy storage battery, thereby further reducing energy consumption.

[0034] The present invention can dynamically adjust the start and stop of the second motor according to the changes in material parameters through the coordinated use of the sensor module and the analysis module, so as to maintain a balance between energy consumption and screening efficiency. In addition, the entire control process realizes real-time monitoring and adjustment of the operating state of the vibrating screen through the intelligent sensor and analysis module, thereby improving the intelligence level of the screening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the steps of the energy-saving control method for a multi-frequency vibrating screen of the present invention;

[0036] Figure 2 It is a principle schematic diagram of the trend curve of the present invention;

[0037] Figure 3 The schematic diagram is a structural diagram of the energy-saving control system for a multi-frequency vibrating screen according to the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script.

[0040] like Figure 1 As shown, an energy-saving control method for a complex frequency vibrating screen comprises:

[0041] S1: When the vibrating screen is in shutdown state, the start-stop module sends a start command to the control module.

[0042] S2: After receiving the start command, the control module controls the first motor and the second motor to start simultaneously. The first motor and the second motor are arranged on one side of the vibrating screen. The first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by the energy storage battery connected thereto.

[0043] The start-stop module includes various control terminals, such as mobile phones, on-site control consoles, etc. The first motor is a single-shaft motor, whose output shaft is connected to the vibrating screen, and the second motor is a double-shaft motor, whose output shaft extends at one end to connect to the vibrating screen, and the other end to connect to the energy storage battery. When the vibrating screen needs to be started, a start instruction is generated by operating the start-stop module, and the start-stop module sends the start instruction to the control module. After receiving the start instruction, if the control module detects that the current vibrating screen is in a shutdown state, the first motor and the second motor are started at the same time. Since the simultaneous start of the first motor and the second motor will output a larger starting power, the start requirements of the vibrating screen can be met.

[0044] S3: multiple preset conditions are set. When one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity, so as to charge the energy storage battery.

[0045] The preset conditions include that the startup time of the first motor reaches the second time, and the current of the first motor returns to normal after startup.

[0046] The second duration can be set within a few seconds to a few minutes. For example, in this embodiment, the second duration is set to 1 minute. After the first motor and the second motor are started at the same time for 1 minute, the control module automatically stops the operation of the second motor, or after running for a period of time, the first motor is reduced from the larger current at the initial startup to a normal value, and the analysis module stops the operation of the second motor. Based on the above steps, when the vibrating screen is started, the first motor and the second motor are made to work at the same time to ensure that the vibrating screen can start normally. After starting, the second motor is stopped. At this time, the vibrating screen drives the second motor, and the second motor is equivalent to a generator to charge the energy storage battery. That is, when the first motor is working, the second motor module is powered off and reversely charges the energy storage battery at the same time. When the second motor block needs to be powered on, it uses the electric energy in the energy storage battery to operate.

[0047] S4: The sensor module detects the state of the first motor and the material parameters in the vibrating screen at first time intervals, and sends the state of the first motor and the material parameters to the analysis module.

[0048] S5: The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters.

[0049] Specifically, the sensor module includes a weight sensor, a temperature and humidity sensor, an image sensor, etc., through which the weight, density, particle size distribution, viscosity, etc. of the material on the screen can be detected. The image sensor can be used to capture the image on the vibrating screen, and then input into the artificial intelligence algorithm for identification. Specifically, the CNN neural network algorithm can be used, and a Softmax layer can be added to the network to convert the final output material parameters into specific values ​​within a certain range of values; for example, 0-1 represents the particle size distribution, and the larger the value, the larger the proportion of materials with large particle sizes. These parameters are then sent to the analysis module, which is a server with a variety of judgment conditions stored inside. When a material parameter meets a certain judgment condition, the analysis module will restart the second motor. Since the properties of the material are constantly changing during the screening process of the vibrating screen, by detecting these changes and adjusting whether the second motor is connected or not, it can be ensured that the vibrating screen maintains a balance between energy consumption and screening efficiency.

[0050] S6: After the start-stop module sends a stop instruction to the control module, the control module stops the first motor and the second motor.

[0051] When the vibrating screen needs to be stopped, a stop command is sent through the start-stop module, and the control module stops the first motor and the second motor at the same time after receiving the stop command. If the first motor and the second motor are in a state of running at the same time when the control module receives the stop command, the first motor and the second motor are stopped; if the first motor is in a running state and the second motor is in a stopped state, the first motor is stopped. . .

[0052] The present invention provides a large starting power by starting the first motor and the second motor at the same time on the basis of setting two motors, so as to meet the starting requirements of the vibrating screen. When the vibrating screen is running, the vibrating screen is used to drive the second motor to generate electricity, so as to charge the energy storage battery, thereby further reducing energy consumption.

[0053] The present invention can dynamically adjust the start and stop of the second motor and the vibrating screen according to the changes in material parameters through the coordinated use of the sensor module and the analysis module, so as to maintain a balance between energy consumption and screening efficiency. In addition, the entire control process realizes real-time monitoring and adjustment of the operating state of the vibrating screen through intelligent sensors and analysis modules, thereby improving the intelligence level of the screening process.

[0054] It is particularly noteworthy that the present invention can ensure the normal operation of the vibrating screen and reduce the energy consumption of the vibrating screen.

[0055] In this embodiment, the analysis module adjusts the start and stop of the second motor and the vibrating screen including the following steps:

[0056] The analysis module is provided with starting conditions and a plurality of representative parameters. Each representative parameter is provided with a corresponding judgment condition. The analysis module selects the representative parameters from the received material parameters. If the first motor is in an overload state, or there are representative parameters that meet the judgment conditions, and the second motor is in a stopped state, the analysis module generates a first instruction to start the second motor.

[0057] If all representative parameters do not satisfy the judgment condition and the second motor is in the starting state, the analysis module generates a second instruction to stop the second motor.

[0058] When the first motor is in an overload state, it indicates that the operation of the vibrating screen can no longer be satisfied by relying solely on the first motor, so the second motor is started. Since there are many factors affecting the screening efficiency, in order to avoid frequent adjustment of the start and stop of the second motor, in this embodiment, by analyzing the material parameters, only a few material parameters that have a greater impact on the screening efficiency are selected as representative parameters. When the representative parameters meet the set judgment conditions, the second motor will be started. Here, quality is used as an example as a representative parameter. After the sensor module collects a variety of material parameters on the vibrating screen, the analysis module obtains the material quality from it, and sets the first threshold value of the corresponding material quality in advance. If the material quality is greater than the first threshold value, and the current second motor is in a stopped state, the second motor is restarted, thereby improving the screening efficiency of the vibrating screen. If the material quality is less than the first threshold value and the second motor is in a started state, the second motor is stopped, thereby reducing the energy consumption of the vibrating screen.

[0059] In this embodiment, determining the representative parameter includes the following steps:

[0060] The first historical data of various material parameters of the vibration screen operation process when the second motor is stopped are collected, the abnormal data of the first historical data are eliminated to obtain the second historical data, and various basic equations about the screening efficiency of the vibration screen are constructed based on the second historical data. The basic equations are multivariate linear regression equations, and different basic equations include different material parameters.

[0061] Calculate the score of each basic equation, eliminate the basic equations with scores less than the first threshold to obtain the prediction equation, assign the score of the prediction equation to each material parameter included in it as the basic score of the material parameter, add up all the basic scores obtained by the material parameters to obtain the total score, sort the total scores from large to small, and select the material parameters corresponding to the first M total scores as representative parameters.

[0062] The sensor module takes 30 seconds as a time period, collects data on various material parameters of the vibrating screen within 30 seconds, and summarizes all material parameters collected within 30 seconds as a first historical data storage. Specifically, three time points are set within a time period to obtain various material parameters at each time point. For example, data at three time points will be obtained for material quality, and the average value of the data at these three time points is taken as the value of the corresponding material quality in the first historical data. The same applies to other material parameters. Finally, the screening efficiency is calculated based on the total feed amount and total screening amount within the time period.

[0063] In order to ensure the accuracy of subsequent analysis, the present invention also performs data cleaning on the first historical data after collecting sufficient first historical data. The data cleaning includes deduplicating duplicate values ​​in the data, locating and removing abnormal values ​​in the data. In addition, if the value of a material parameter in the data is missing, the entire first historical data is marked with a missing symbol, and the first historical data carrying the missing symbol will not be substituted into the subsequent analysis.

[0064] After cleaning the first historical data, the second historical data is obtained. In this embodiment, SPSS is used for multivariate linear analysis to obtain the basic equation. Before constructing the basic equation through the second historical data, the vibrating screen screening efficiency is first calculated according to the material parameters in the second historical data. When constructing, two material parameters are selected to construct the basic equation about the screening efficiency. The constructed basic equation can predict the actual screening efficiency according to the material parameters; for example, if there is material parameter AG, material parameters A and B are first selected from them to construct the basic equation about the screening efficiency. Specifically, the specific values ​​of material parameters A and B are extracted from each second historical data, as well as the screening efficiency corresponding to the second historical data, and the above data are input into the SPSS software to construct the basic equation. For example, the constructed basic equation is Q=ax+by+c, where Q is the screening efficiency, a and b are polynomial coefficients, c is a constant, x represents the value of the material parameter A to be input, and y represents the value of the material parameter B to be input. Then select material parameters A and C again, and repeat the above process to generate a new basic equation again.

[0065] After traversing and combining various material parameters, three material parameters are selected to construct the basic equation for screening efficiency, and then four material parameters are selected to construct the basic equation for screening efficiency. The process is repeated until the number of selected material parameter types reaches a preset value, for example, 5. In this way, a large number of basic equations are obtained. In order to facilitate subsequent screening, this embodiment calculates the score of each basic equation and eliminates the basic equations with a score less than the first threshold, and the first threshold is, for example, 0.6. The worse the score of the basic equation, the less reliable the prediction result of the basic equation. The method for calculating the score of the basic equation will be introduced later. The basic equations retained here are defined as prediction equations. Assuming that there are material parameters A and B in a prediction equation and the score of the prediction equation is 0.6, material parameters A and B respectively obtain a basic score of 0.6. Assuming that there are material parameters A, B, and C in another prediction equation and the score of the prediction equation is 0.8, material parameters A and B respectively obtain a basic score of 0.8, and the total score of material parameter A is 0.6+0.8=1.4. The significance of this is that the higher the score of the prediction equation is, the better the prediction effect of the prediction equation is, which further indicates that the material parameters included therein are more relevant to the screening efficiency.

[0066] Finally, set the value of M to 3, sort the total score of each material parameter from large to small, and select the first three material parameters as representative parameters.

[0067] In this embodiment, the calculation of the score of the basic equation includes the following steps:

[0068] Select multiple pieces of second historical data, define the time period in which the second historical data is generated as the test time period, calculate the actual screening efficiency in each piece of second historical data, extract a basic equation as the test equation, locate the test parameters included in the test equation, calculate the predicted screening efficiency at each test time point based on the test parameters and the test equation, and calculate the score R of the test equation based on the first formula, which is: , where Ei is the actual screening efficiency of the vibrating screen in the i-th test time period, j is the number of test time periods, Fi is the predicted screening efficiency of the i-th test time period calculated by the test equation, and μ is the average of all predicted screening efficiencies.

[0069] For example, if the basic equation including material parameters A and B is calculated, the equation is defined as a test equation, and the specific values ​​of material parameters A and B in each second historical data are obtained and substituted into the test equation to obtain the predicted screening efficiency for multiple test time periods. Then the average value of the predicted screening efficiency is calculated, and the actual screening efficiency corresponding to each second historical data is substituted into the first formula to obtain the score of the test equation. In the first formula, the closer the predicted screening efficiency calculated by the test equation is to the actual screening efficiency, the greater the score of the calculated basic equation.

[0070] In this embodiment, determining the judgment condition of each representative parameter includes the following steps:

[0071] A representative parameter is selected as the parameter to be analyzed, and multiple second historical data are selected as the data to be analyzed. Except for the parameter to be analyzed, the difference in the numerical value of the same type of representative parameter between the data to be analyzed is within a preset range. The actual screening efficiency of each second historical data is calculated, and a trend curve of the actual screening efficiency changing with the parameter to be analyzed is drawn. The maximum curvature point in the trend curve is obtained, and the numerical value of the parameter to be analyzed corresponding to the maximum curvature point is set as the corresponding second threshold value. If the trend curve is a downward trend, the judgment condition is set to that the representative parameter is less than the second threshold value, otherwise the judgment condition is set to that the representative parameter is greater than or equal to the second threshold value.

[0072] For example, the representative parameter Pa is selected as the parameter to be analyzed, and then three pieces of data to be analyzed are extracted from the second historical data according to the parameter to be analyzed. The three pieces of data to be analyzed all have the representative parameter Pa, the representative parameter Pb, and the representative parameter Pc. Except for the representative parameter Pa, the difference between the representative parameters Pb in different pieces of data to be analyzed and the difference between the representative parameters Pc are all within the preset range, that is, except for the representative parameter Pa, the other representative parameters between the pieces of data to be analyzed are relatively similar. In this way, the relationship between the actual screening efficiency and the representative parameter Pa can be obtained, and a trend curve can be drawn according to the relationship, such as Figure 2 As shown, the maximum curvature point G is selected in the trend curve. The maximum curvature point means that before this point, the representative parameter Pa has little effect on the screening efficiency when it increases. After the representative parameter Pa increases to the maximum curvature point, relying solely on the first motor to maintain operation will cause the screening efficiency of the vibrating screen to drop rapidly. Therefore, the value of the maximum curvature point corresponding to the representative parameter Pa is used as the first threshold, and the trend curve is an increasing trend. The final judgment condition is that when the actual value of the representative parameter Pa is greater than the second threshold, the second motor is started.

[0073] In this embodiment, removing abnormal data from the first historical data includes the following steps:

[0074] The material parameters of the same type in the first historical data are divided into a first data group, and the material parameters with adjacent collection times are extracted from the first data group to construct a second data group. The material parameters in the second data group are sorted from small to large, and the median is located. A material parameter is extracted from the second data group as the target data, and the direction of the target data toward the median is taken as the positive sequence direction. With the target data as the starting point, K material parameters except the median are extracted along the positive sequence direction.

[0075] The deviation value U of the target data is calculated based on the second formula, which is: , where Dx is the target data, Dx+1 is the material parameter adjacent to the target data in the positive sequence direction, and Dk is the kth material parameter extracted in the positive sequence direction. When the deviation value exceeds the critical value, the target data is defined as an outlier and deleted.

[0076] For example, all the quality parameters in the first historical data are divided into the first data group, and then the quality parameters with adjacent collection times are extracted from them. By extracting the quality parameters with adjacent collection times, the purpose is to find whether there are material parameters that deviate from abnormal values ​​within a certain period of time. In the second data group, it is assumed that there are material parameters Qa-Qe, where material parameter Qc is the median, the target data is Qa, and the value of K is set to 3. Then in the second formula, Dx represents the value of Qa, Dx+1 represents the value of material parameter Qb, and D1-D3 represent the values ​​of material parameters Qb, Qd, and Qe respectively. Substituting them into the second formula can obtain the target data, that is, the deviation value of material parameter Qa. Here, the critical value is set to 1. When the calculated deviation value exceeds 1, the target data is considered to be an abnormal value and deleted.

[0077] like Figure 3 As shown, the present invention also provides an energy-saving control system for a multi-frequency vibrating screen, which is used to implement the above-mentioned energy-saving control method for a multi-frequency vibrating screen, and the system includes:

[0078] The start-stop module is used to send start and stop instructions to the control module when the vibrating screen is in the shutdown state.

[0079] The control module controls the first motor and the second motor to start simultaneously after receiving a start instruction. The first motor and the second motor are arranged on one side of the vibrating screen. The first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by an energy storage battery connected thereto. A plurality of preset conditions are set. After one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity to charge the energy storage battery. After receiving a stop instruction, the control module stops the first motor and the second motor.

[0080] The sensor module is used to detect the state of the first motor and the material parameters in the vibrating screen at each first time interval, and send the state of the first motor and the material parameters to the analysis module.

[0081] The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters.

[0082] The present invention also discloses a computer storage medium, wherein the computer storage medium stores program instructions, wherein when the program instructions are executed, the device where the computer storage medium is located is controlled to execute the above method.

[0083] It should be understood that the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-mentioned embodiments are 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.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving control method for a multi-frequency vibrating screen, characterized in that: include: When the vibrating screen is in a stopped state, the start-stop module sends a start command to the control module; After receiving the start instruction, the control module controls the first motor and the second motor to start simultaneously, the first motor and the second motor are arranged on one side of the vibrating screen, the first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by an energy storage battery connected thereto; A plurality of preset conditions are set. When one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity, so as to charge the energy storage battery. The preset conditions include that the startup time of the first motor reaches a second time, or the current value of the first motor returns to normal after startup; The sensor module detects the state of the first motor and the material parameters in the vibrating screen at a first time interval, and sends the state of the first motor and the material parameters to the analysis module; The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters; After the start-stop module sends a stop instruction to the control module, the control module stops the first motor and the second motor.

2. The method according to claim 1, characterized in that The analyzing module adjusting the start and stop of the second motor comprises the following steps: The analysis module is provided with a start condition and a plurality of representative parameters, each representative parameter is provided with a corresponding judgment condition, and the analysis module selects the representative parameter from the received material parameters, and if the first motor is in an overload state and satisfies the start condition, or if the representative parameter satisfies the judgment condition and the second motor is in a stopped state, the analysis module generates a first instruction to start the second motor; If all of the representative parameters do not satisfy the judgment condition and the second motor is in a started state, the analysis module generates a second instruction to stop the second motor.

3. The method according to claim 2, characterized in that Determining the representative parameter comprises the following steps: Collecting first historical data of various material parameters during the operation of the vibrating screen when the second motor is stopped, removing abnormal data from the first historical data to obtain second historical data, and constructing various basic equations on the screening efficiency of the vibrating screen based on the second historical data, wherein the basic equations are multiple linear regression equations, and different basic equations include different material parameters; Calculate the score of each basic equation, eliminate the basic equations with scores less than a first threshold to obtain a prediction equation, assign the score of the prediction equation to each material parameter included in it as the basic score of the material parameter, add up all the basic scores obtained by the material parameters to obtain a total score, sort the total scores from large to small, and select the material parameters corresponding to the first M total scores as the representative parameters.

4. The method according to claim 3, characterized in that Calculating the score of the base equation comprises the following steps: Select multiple pieces of the second historical data, define the time period for generating the second historical data as a test time period, calculate the actual screening efficiency in each piece of the second historical data, extract one of the basic equations to define as a test equation, locate the test parameters included in the test equation, calculate the predicted screening efficiency at each test time point based on the test parameters and the test equation, and calculate the score R of the test equation based on the first formula, the first formula being: , where Ei is the actual screening efficiency of the vibrating screen in the i-th test time period, j is the number of the test time periods, Fi is the predicted screening efficiency of the i-th test time period calculated by the test equation, and μ is the average value of all the predicted screening efficiencies.

5. The method according to claim 4, characterized in that Determining the judgment condition of each representative parameter comprises the following steps: Select one of the representative parameters as the parameter to be analyzed, select multiple second historical data as the data to be analyzed, except for the parameter to be analyzed, the differences in the numerical values ​​of the same type of the representative parameters between the data to be analyzed are all within a preset range, calculate the actual screening efficiency of each of the second historical data, draw a trend curve of the actual screening efficiency changing with the parameter to be analyzed, obtain the maximum curvature point in the trend curve, set the numerical value of the parameter to be analyzed corresponding to the maximum curvature point as the corresponding second threshold value, if the trend curve is a downward trend, set the judgment condition to be that the representative parameter is less than the second threshold value, otherwise set the judgment condition to be that the representative parameter is greater than or equal to the second threshold value.

6. The method according to claim 5, characterized in that Eliminating the abnormal data from the first historical data includes the following steps: The material parameters of the same type in the first historical data are divided into a first data group, the material parameters with adjacent collection times are extracted from the first data group to construct a second data group, the material parameters in the second data group are sorted from small to large, and the median thereof is located, one material parameter is extracted from the second data group as the target data, the direction of the target data toward the median is taken as the positive sequence direction, and K material parameters other than the median are extracted along the positive sequence direction with the target data as the starting point; The deviation value U of the target data is calculated based on a second formula, where the second formula is: , where Dx is the target data, Dx+1 is the material parameter adjacent to the target data in the positive sequence direction, and Dk is the kth material parameter extracted along the positive sequence direction. When the deviation value exceeds the critical value, the target data is defined as an abnormal value and deleted.

7. An energy-saving control system for a multi-frequency vibrating screen, used to implement the method according to any one of claims 1 to 6, characterized in that: include: A start-stop module, when the vibrating screen is in a stopped state, the start-stop module is used to send a start instruction and a stop instruction to the control module; A control module controls the first motor and the second motor to start simultaneously after receiving the start instruction, the first motor and the second motor are arranged on one side of the vibrating screen, the first motor is a single-axis motor, the second motor is a double-axis motor, and the second motor is powered by an energy storage battery connected thereto, and multiple preset conditions are set. After one of the preset conditions is met, the control module stops the second motor, and the vibrating screen drives the second motor to generate electricity to charge the energy storage battery. The preset conditions include that the start-up time of the first motor reaches a second time, or the current value of the first motor returns to normal after starting. After receiving the stop instruction, the control module stops the first motor and the second motor; A sensor module, configured to detect a state of the first motor and a material parameter in the vibrating screen at a first time interval, and send the state of the first motor and the material parameter to an analysis module; The analysis module adjusts the start and stop of the second motor based on the state of the first motor and the material parameters.

8. A computer storage medium, characterized in that The computer storage medium stores program instructions, wherein when the program instructions are executed, the device where the computer storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

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