Electric actuator control system and electric actuator thereof

Abstract

The invention relates to the field of automatic control, in particular to an electric actuator control system and an electric actuator thereof, which comprise a working condition parameter detection module, a working condition matching module, a torque adjusting module, a valve control module, an overload protection module, a protection performance detection module, a protection performance analysis module and a management database, the torque coefficient corresponding to the valve type is obtained according to valve type matching, the expected torque value of the valve is obtained by combining the torque coefficient corresponding to the fluid parameter, the valve torque value is adjusted accordingly, the deviation distance of the valve detection point is obtained through the coordinate position, and therefore the valve position is adjusted. Whether the electric actuator is overloaded or not is judged and processed by analyzing the load degree of the electric actuator, the protection performance of the electric actuator is obtained by analyzing the protection performance parameters of the electric actuator and fed back, accurate control and adjustment are achieved, and the safety and stability of the system are enhanced.

Description

Technical Field

[0001] The invention relates to the field of automatic control, and in particular to an electric actuator control system and an electric actuator thereof. Background Art

[0002] With the continuous development of modern industry, the application of automation control technology in various fields is becoming more and more extensive. As an important execution component in the automation control system, electric actuators play a key role.

[0003] In the industrial production process, the flow, pressure, temperature, etc. of various fluid media need to be precisely controlled to ensure the stability, efficiency and safety of the production process. Electric actuators can convert control signals into mechanical actions to achieve precise adjustment of valves, dampers, etc. In recent years, with the rapid progress of electronic technology, computer technology and communication technology, electric actuator control systems are also constantly being upgraded and improved. New control algorithms, intelligent control strategies and remote monitoring technologies are constantly being integrated into them, making electric actuators more and more important in the field of industrial automation, providing strong support for promoting the intelligent and efficient development of modern industry.

[0004] For example, the existing Chinese patent with application number 202110351560.1 discloses an intelligent pressure regulation control system and method. This solution achieves regulation and control of the pressure at both ends of the valve through wireless connection between the cloud platform and the monitoring node, as well as electric actuators, valves, pressure transmitters and other equipment in the monitoring node. Through the comparison table and related modules and algorithms in the cloud platform, the electric actuator is accurately controlled to adjust the valve according to the pressure data to achieve pressure regulation. It can also detect gas leaks and other situations and take corresponding measures, realizing remote pressure regulation and control and improving the convenience and efficiency of management.

[0005] However, there are still the following shortcomings: First, the solution mainly focuses on pressure regulation and control and gas leak detection and processing, and does not involve the regulation of valve torque value. It may not be possible to accurately grasp the operating force and status of the valve, resulting in unsatisfactory valve opening and closing degree and affected sealing performance, which in turn affects the operating stability and reliability of the entire system.

[0006] Second, this solution does not involve the adjustment of the valve position, which may result in the inability to accurately control the flow and direction of the fluid. For some scenarios that require precise flow control, the lack of consideration of the flow may affect the system effect and may also affect the overall safety and stability of the system. Summary of the invention

[0007] In order to overcome the shortcomings of the background technology, an embodiment of the present invention provides an electric actuator control system and an electric actuator thereof, which can effectively solve the problems involved in the above-mentioned background technology.

[0008] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides an electric actuator control system, including: an operating parameter detection module, used to obtain the operating parameters of the valve, and then analyze and obtain the torque coefficient corresponding to the fluid parameters, the operating parameters including the temperature uniformity and flow fluctuation rate of the fluid.

[0009] The working condition matching module is used to obtain the torque coefficient corresponding to the valve type according to the valve type matching, and at the same time detect the pressure difference at both ends of the valve, and analyze the torque coefficient corresponding to the fluid parameters to obtain the expected torque value of the valve.

[0010] The torque adjustment module is used to detect the actual torque value of the valve at each time point, obtain the torque difference of the valve at each time point by difference, and adjust the torque value of the valve at each time point based on this.

[0011] The valve control module is used to obtain the deviation distance of the valve detection point through the coordinate position, determine whether the valve position is qualified, and then adjust the valve position.

[0012] The overload protection module is used to detect the working parameters of the electric actuator, analyze the load level of the electric actuator, and then determine whether the electric actuator is overloaded and take action. The working parameters include maximum current value, maximum voltage value, and power.

[0013] The protection performance detection module is used to detect the protection performance parameters of the electric actuator, and the protection performance parameters include dustproof performance, waterproof performance, and anti-corrosion performance.

[0014] The protection performance analysis module is used to obtain the protection performance of the electric actuator according to the protection performance parameters of the electric actuator and provide feedback thereto.

[0015] The management database is used to store the preset torque coefficients and valve design drawings corresponding to each valve type.

[0016] Preferably, the specific analysis method of the working condition parameter detection module is as follows: in the first step, a number of equally spaced measurement points are selected on the main channel of the fluid flow, and a number of time points are selected according to the set time length, which are recorded as each time point, and the fluid temperature at each measurement point at each time point is detected by a temperature sensor, which is recorded as m represents the number of the mth measurement point, m = 1, 2, ..., q, i represents the number of the ith time point, i = 1, 2, ..., n, and the average temperature of the fluid at each time point is obtained by averaging the fluid temperatures at each measurement point, denoted as Substituting this into the formula The temperature uniformity of the fluid is obtained, α, where q represents the number of measurement points and n represents the number of time points.

[0017] The second step is to divide the time period into fixed time periods and monitor the fluid flow rate in each time period through a flow meter, which is recorded as M x , x represents the number of the x-th time period, x = 1, 2, ..., y, and the fluid flow rate is obtained by taking the average value of the fluid flow rate in each time period, which is recorded as Substituting this into the formula The flow fluctuation rate σ is obtained, and y represents the number of time periods.

[0018] The third step is to substitute the temperature uniformity α and flow rate fluctuation σ of the fluid into the formula The torque coefficient κ corresponding to the fluid parameters is obtained 1 ,φ 1 ,φ 2 They represent the preset temperature uniformity and flow rate fluctuation correction factors, k 0 Indicates the base torque coefficient.

[0019] Preferably, the specific analysis method of the working condition matching module is: obtain the valve type, and read the torque coefficient corresponding to each preset valve type from the management database, and match the torque coefficient corresponding to the valve type, which is recorded as κ 2 , install pressure sensors at the inlet and outlet of the valve, start the fluid and adjust it to normal working state, and detect the pressure at the inlet and outlet of the valve at each time point, recorded as By formula The pressure difference ΔP at both ends of the valve is obtained, where n represents the number of time points. At the same time, the diameter of the valve is measured, recorded as D, and the formula is used Get the valve diameter area M, π represents pi, substitute it into the formula τ=ΔP*M*κ 1 *κ 2 Get the expected torque value τ, κ of the valve 1 Indicates the torque coefficient corresponding to the fluid parameters.

[0020] Preferably, the specific analysis method for adjusting the torque value of the valve at each time point is: the first step is to install the torque sensor on the output shaft of the electric actuator, and obtain the actual torque value output by the electric actuator at each time point, which is recorded as the actual torque value of the valve at each time point.

[0021] The second step is to read the expected torque value of the valve, and obtain the torque difference value of the valve at each time point by subtracting the actual torque value of the valve at each time point from the expected torque value of the valve.

[0022] The third step is to read the torque difference of the valve at each time point, and compare the torque difference of the valve at each time point with the preset torque difference threshold. If the torque difference of the valve at a certain time point is not within the preset torque difference threshold, the actual torque value of the valve at that time point is adjusted to the expected torque value of the valve, otherwise no adjustment is required.

[0023] Preferably, the specific analysis method of the valve control module is: extract the valve design drawing from the management database, read the set valve stem position of the valve therefrom, take any vertex of the valve stem as the detection point, record it as the valve stem detection point, obtain the position coordinates of the valve stem detection point, record it as (x, y), and at the same time, detect the current actual position of the valve stem detection point in real time through the position sensor, record it as (x', y'), and use the formula Obtain the deviation distance d of the valve detection point, and compare the deviation distance of the valve detection point with the preset deviation distance threshold. If the deviation distance of the valve detection point is greater than or equal to the preset deviation distance threshold, adjust the valve position; if the deviation distance of the valve detection point is less than the preset deviation distance threshold, it indicates that the valve position is qualified.

[0024] Preferably, the specific analysis method for adjusting the valve position is as follows: in the first step, the deviation distance of the valve detection point is read, and the position of the valve is adjusted according to the deviation distance of the valve detection point.

[0025] In the second step, the position coordinates of the valve detection point after position adjustment are obtained again, and the deviation distance of the valve detection point after adjustment is obtained by analyzing the deviation distance of the valve detection point.

[0026] In the third step, if the deviation distance of the valve detection point after adjustment is 0, it means that the adjustment is qualified. If the deviation distance of the valve detection point after adjustment is not 0, return to the first step until the deviation distance of the valve detection point after adjustment is 0.

[0027] Preferably, the specific analysis method of the overload protection module is as follows: in the first step, a number of time points are selected within the working time of the electric actuator according to the set time, which are recorded as detection time points, and the current value of the electric actuator at each detection time point is detected by a current sensor, which is recorded as I j , j represents the number of the jth detection time point, j = 1, 2, ..., k, and at the same time, the voltage value of each detection time point of the electric actuator is detected by the voltage sensor, which is recorded as V j , respectively, select the maximum value from the current value and voltage value of the electric actuator at each detection time point, and record it as the maximum current value I of the electric actuator max , Maximum voltage value V max , through the formula The power P of the electric actuator is obtained, and k represents the number of detection time points.

[0028] The second step is to set the maximum current value I max , Maximum voltage value V max , power P, and substitute it into the formula Get the load level of the electric actuator I 0 、V 0 , P 0 Respectively represent the reference values ​​of the set current, voltage and power. The weight factors of the current, voltage and power of the preset electric actuator are respectively represented. The load degree of the electric actuator is compared with the preset load degree threshold. If the load degree of the electric actuator is greater than or equal to the preset load degree threshold, it means that the electric actuator is overloaded and the control system temporarily stops running. If the load degree of the electric actuator is less than the preset load degree threshold, it means that the electric actuator is working normally.

[0029] Preferably, the specific analysis method of the protection performance detection module is as follows: in the first step, a dust generator is used to create a dust environment with a specific particle size and concentration, the protective shell of the electric actuator is placed in the dust environment for a set period of time, and the dust content inside the protective shell is detected by a dust particle counter, which is recorded as σ, and the formula Get the dustproof performance δ of the electric actuator 尘 , σ 0 Indicates the set dust content reference value.

[0030] The second step is to prepare water of a set weight, record its weight as M, immerse the protective shell of the electric actuator completely in the water, apply a set water pressure to it through a hydraulic pump, and remove the protective shell of the electric actuator from the water after maintaining the set time. Detect the weight of the water again, record it as M', and substitute it into the formula Waterproof performance of electric actuator 水 .

[0031] The third step is to obtain an image of the protective shell of the electric actuator, which is recorded as the protective shell image. The protective shell image is grayed, and the gray value of each pixel of the protective shell image is detected respectively. The initial gray value of the protective shell image is obtained by averaging the gray values ​​of each pixel of the protective shell image, which is recorded as A test box simulating a corrosive environment is built, the protective shell of the electric actuator is placed in it and a fixed time period is set. After each time period, the protective shell of the electric actuator is imaged, recorded as the protective shell image of each time period. The protective shell image of each time period is grayed, and the gray value of each pixel point of the protective shell image of each time period is detected respectively. The number of difference pixels of the protective shell image of each time period is obtained by screening, recorded as N. f , f represents the number of the fth time period, f = 1, 2, ..., g, and the total pixel points N of the protective shell image are extracted at the same time 总 , through the formula Get the anti-corrosion performance of the electric actuator δ 腐蚀 , g represents the number of time periods.

[0032] Preferably, the specific analysis method of the protection performance analysis module is: respectively reading the dustproof performance δ of the electric actuator 尘 、Waterproof performance 水 、Corrosion resistance 腐蚀 , substituting it into the formula χ=δ 尘 *φ 3 +δ 水 *φ 4 +δ 腐蚀 *φ 5 Get the protection performance of the electric actuator χ, φ 3 ,φ 4 ,φ 5 The weight factors of the dustproof performance, waterproof performance and corrosion resistance of the preset electric actuator are respectively represented. The protection performance of the electric actuator is compared with the preset protection performance threshold. If the protection performance of the electric actuator is greater than or equal to the preset protection performance threshold, it means that the protection performance of the electric actuator is qualified. If the protection performance of the electric actuator is less than the preset protection performance threshold, it means that the protection performance of the electric actuator is unqualified, and feedback is given to the system.

[0033] A second aspect of the present invention provides an electronic device, characterized in that the electric actuator includes a processor, a memory and a communication bus, and the memory stores a computer-readable program that can be executed by the processor.

[0034] The communication bus realizes the connection and communication between the processor and the memory.

[0035] When the processor executes the computer-readable program, the steps in the electric actuator control system according to the present invention are implemented.

[0036] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention obtains the torque coefficient corresponding to the valve type according to the valve type matching, and obtains the expected torque value of the valve by combining the torque coefficient analysis corresponding to the fluid parameters, and adjusts the torque value of the valve at each time point based on this, which can ensure that the valve obtains the appropriate torque under different working conditions and realizes precise operation.

[0037] 2. The present invention obtains the deviation distance of the valve detection point through the coordinate position, determines whether the valve position is qualified, and then adjusts the valve position. It can timely detect the position deviation and make adjustments to avoid potential problems caused by improper position.

[0038] 3. The present invention detects the working parameters of the electric actuator, analyzes the load level of the electric actuator, and then determines whether the electric actuator is overloaded and takes appropriate measures. It can timely detect and avoid damage to the electric actuator due to overload, thereby extending its service life.

[0039] 4. The present invention obtains the protection performance of the electric actuator based on the protection performance parameter analysis of the electric actuator, and provides feedback thereon to ensure that it can effectively protect itself and related equipment under specific circumstances and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0041] Figure 1 This is a system module connection diagram of the present invention.

[0042] Figure 2 for Figure 1 Schematic diagram of the flow of the method for adjusting the torque value of the valve at each time point in the torque adjustment module.

[0043] Figure 3 for Figure 1 Schematic diagram of the flow chart of the method for adjusting the valve position in the valve control module. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 the present invention.

[0045] See also Figure 1 As shown, an electric actuator control system includes an operating parameter detection module, an operating condition matching module, a torque adjustment module, a valve control module, an overload protection module, a protection performance detection module, a protection performance analysis module, and a management database.

[0046] The working condition matching module is connected to the working condition parameter detection module, the torque adjustment module, and the management database; the management database is connected to the valve control module, the overload protection module, and the protection performance analysis module; and the protection performance detection module is connected to the protection performance analysis module.

[0047] The operating parameter detection module is used to obtain the operating parameters of the valve, and then analyze the torque coefficient corresponding to the fluid parameters. The operating parameters include the temperature uniformity and flow fluctuation rate of the fluid.

[0048] The specific analysis method of the working condition parameter detection module is as follows: the first step is to select a number of equally spaced measurement points on the main channel of the fluid flow, and select a number of time points according to the set duration, which are recorded as each time point, and the temperature of the fluid at each measurement point at each time point is detected by a temperature sensor, which is recorded as m represents the number of the mth measurement point, m = 1, 2, ..., q, i represents the number of the ith time point, i = 1, 2, ..., n, and the average temperature of the fluid at each time point is obtained by averaging the fluid temperatures at each measurement point, denoted as Substituting this into the formula The temperature uniformity of the fluid is obtained, α, where q represents the number of measurement points and n represents the number of time points. Calculating the average temperature of the fluid at each measurement point at each time point can eliminate the influence of individual abnormal values ​​and more accurately reflect the overall temperature level of the fluid, which is helpful to discover possible problems or abnormalities in the fluid temperature, make timely adjustments and improvements, and ensure the normal operation and performance of the system.

[0049] The second step is to divide the time period into fixed time periods and monitor the fluid flow rate in each time period through a flow meter, which is recorded as M x , x represents the number of the x-th time period, x = 1, 2, ..., y, and the fluid flow rate is obtained by taking the average value of the fluid flow rate in each time period, which is recorded as Substituting this into the formula The flow fluctuation rate σ is obtained, and y represents the number of time periods; abnormal flow fluctuations can be discovered in time so that corresponding measures can be taken to adjust and optimize, ensuring the smoothness and reliability of the fluid transportation process.

[0050] The third step is to substitute the temperature uniformity α and flow rate fluctuation σ of the fluid into the formula The torque coefficient κ corresponding to the fluid parameters is obtained1 ,φ 1 ,φ 2 They represent the preset temperature uniformity and flow rate fluctuation correction factors, k 0 Indicates the base torque coefficient; helps optimize system operation and performance, improving overall system efficiency and reliability.

[0051] The working condition matching module is used to obtain the torque coefficient corresponding to the valve type according to the valve type matching, and at the same time detect the pressure difference at both ends of the valve, and analyze the torque coefficient corresponding to the fluid parameters to obtain the expected torque value of the valve.

[0052] The specific analysis method of the working condition matching module is: obtain the valve type, and read the preset torque coefficient corresponding to each valve type from the management database, and match the torque coefficient corresponding to the valve type, which is recorded as κ 2 , install pressure sensors at the inlet and outlet of the valve, start the fluid and adjust it to normal working state, and detect the pressure at the inlet and outlet of the valve at each time point, recorded as By formula The pressure difference ΔP at both ends of the valve is obtained, where n represents the number of time points. At the same time, the diameter of the valve is measured, recorded as D, and the formula is used Get the valve diameter area M, π represents pi, substitute it into the formula τ=ΔP*M*κ 1 *κ 2 Get the expected torque value τ, κ of the valve 1 Indicates the torque coefficient corresponding to the fluid parameters; helps to better guide the operation and control of the valve, achieve precise fluid regulation, and improve the efficiency and performance of the system.

[0053] The torque adjustment module is used to detect the actual torque value of the valve at each time point, obtain the torque difference of the valve at each time point by difference, and adjust the torque value of the valve at each time point based on this.

[0054] See also Figure 2 As shown, the specific analysis method for adjusting the torque value of the valve at each time point is: the first step is to install the torque sensor on the output shaft of the electric actuator, and obtain the actual torque value output by the electric actuator at each time point, which is recorded as the actual torque value of the valve at each time point.

[0055] The second step is to read the expected torque value of the valve, and obtain the torque difference value of the valve at each time point by subtracting the actual torque value of the valve at each time point from the expected torque value of the valve.

[0056] It should be noted that the specific analysis method of the torque difference of the valve at each time point is: respectively read the expected torque value τ of the valve and the actual torque value of the valve at each time point, and record the actual torque value of the valve at each time point as τ' i , through the formula Δτ i =τ-τ' i Get the torque difference Δτ of the valve at each time point i .

[0057] The third step is to read the torque difference of the valve at each time point, and compare the torque difference of the valve at each time point with the preset torque difference threshold. If the torque difference of the valve at a certain time point is not within the preset torque difference threshold, the actual torque value of the valve at that time point is adjusted to the expected torque value of the valve, otherwise no adjustment is required; the torque deviation can be discovered in time and corresponding measures can be taken to correct it, thereby improving the stability and reliability of the system.

[0058] The valve control module is used to obtain the deviation distance of the valve detection point through the coordinate position, determine whether the valve position is qualified, and then adjust the valve position.

[0059] The specific analysis method of the valve control module is as follows: extract the valve design drawing from the management database, read the set valve stem position of the valve from it, take any vertex of the valve stem as the detection point, record it as the valve stem detection point, obtain the position coordinates of the valve stem detection point, record it as (x, y), and at the same time use the position sensor to detect the current actual position of the valve stem detection point in real time, record it as (x', y'), and use the formula The deviation distance d of the valve detection point is obtained, and the deviation distance of the valve detection point is compared with the preset deviation distance threshold. If the deviation distance of the valve detection point is greater than or equal to the preset deviation distance threshold, the valve position is adjusted. If the deviation distance of the valve detection point is less than the preset deviation distance threshold, it indicates that the valve position is qualified. It can accurately judge whether the valve position is qualified, facilitate taking corresponding adjustment measures, and improve the accuracy and reliability of the valve.

[0060] See also Figure 3 As shown, the specific analysis method for adjusting the valve position is: the first step is to read the deviation distance of the valve detection point, and adjust the valve position according to the deviation distance of the valve detection point.

[0061] In the second step, the position coordinates of the valve detection point after position adjustment are obtained again, and the deviation distance of the valve detection point after adjustment is obtained by analyzing the deviation distance of the valve detection point.

[0062] In the third step, if the deviation distance of the valve detection point after adjustment is 0, it means that the adjustment is qualified. If the deviation distance of the valve detection point after adjustment is not 0, return to the first step until the deviation distance of the valve detection point after adjustment is 0; ensure that the valve is always in the best working state, reduce potential problems and failure risks caused by position deviation, and improve the stability and reliability of the entire system.

[0063] The overload protection module is used to detect the working parameters of the electric actuator, analyze the load level of the electric actuator, and then determine whether the electric actuator is overloaded and take action. The working parameters include maximum current value, maximum voltage value, and power.

[0064] The specific analysis method of the overload protection module is as follows: In the first step, a number of time points are selected within the working time of the electric actuator according to the set time, which are recorded as detection time points, and the current value of each detection time point of the electric actuator is detected by a current sensor, which is recorded as I j , j represents the number of the jth detection time point, j = 1, 2, ..., k, and at the same time, the voltage value of each detection time point of the electric actuator is detected by the voltage sensor, which is recorded as V j , respectively, select the maximum value from the current value and voltage value of the electric actuator at each detection time point, and record it as the maximum current value I of the electric actuator max , Maximum voltage value V max , through the formula The power P of the electric actuator is obtained, and k represents the number of detection time points; the current and voltage changes of the electric actuator during operation can be fully understood, and abnormal fluctuations or potential problems can be discovered in time, which is conducive to taking measures in advance to prevent failures and improve the reliability and stability of the equipment.

[0065] The second step is to set the maximum current value I max , Maximum voltage value V max , power P, and substitute it into the formula Get the load level of the electric actuator I 0 、V 0 , P 0 Respectively represent the reference values ​​of the set current, voltage and power. The weight factors of the current, voltage and power of the preset electric actuator are respectively represented. The load degree of the electric actuator is compared with the preset load degree threshold. If the load degree of the electric actuator is greater than or equal to the preset load degree threshold, it means that the electric actuator is overloaded and the control system temporarily stops running. If the load degree of the electric actuator is less than the preset load degree threshold, it means that the working state of the electric actuator is normal. When an overload occurs, the control system can be suspended in time to avoid damage to the equipment due to overload, thereby protecting the equipment and facilitating timely maintenance or adjustment measures to reduce the occurrence rate of equipment failures and maintenance costs.

[0066] It should be noted that, in a specific embodiment, It can be set to 0.5. It can be set to 0.3. It can be set to 0.2. The current can directly reflect the actual load of the electric actuator. When the load increases, the current tends to increase significantly. Its changes are more sensitive and intuitive, and can more accurately reflect the immediate changes in the load. The voltage will also affect the load to a certain extent, but relatively speaking, its fluctuation may be affected by factors such as external power supply. It is not as direct and targeted as the current's reflection of the load. Power is the product of current and voltage. Although it can also reflect the load, it is more the result of the combined effect of current and voltage. Therefore, the weight corresponding to current is the highest, followed by voltage, and the weight corresponding to power is lower.

[0067] The protection performance detection module is used to detect the protection performance parameters of the electric actuator, and the protection performance parameters include dustproof performance, waterproof performance, and anti-corrosion performance.

[0068] The specific analysis method of the protection performance detection module is as follows: In the first step, a dust generator is used to create a dust environment with a specific particle size and concentration, and the protective shell of the electric actuator is placed in the dust environment for a set period of time, and the dust content inside the protective shell is detected by a dust particle counter, which is recorded as σ. Get the dustproof performance δ of the electric actuator 尘 , σ 0 Indicates the set dust content reference value; ensures that the electric actuator can work stably and reliably in a dusty environment and reduces the risk of failure or damage caused by dust ingress.

[0069] The second step is to prepare water of a set weight, record its weight as M, immerse the protective shell of the electric actuator completely in the water, apply a set water pressure to it through a hydraulic pump, and remove the protective shell of the electric actuator from the water after maintaining the set time. Detect the weight of the water again, record it as M', and substitute it into the formula Waterproof performance of electric actuator 水; Ensure that the electric actuator can work safely and reliably in an environment where it may be exposed to water, and avoid damage due to water ingress.

[0070] The third step is to obtain an image of the protective shell of the electric actuator, which is recorded as the protective shell image. The protective shell image is grayed, and the gray value of each pixel of the protective shell image is detected respectively. The initial gray value of the protective shell image is obtained by averaging the gray values ​​of each pixel of the protective shell image, which is recorded as A test box simulating a corrosive environment is built, the protective shell of the electric actuator is placed in it and a fixed time period is set. After each time period, the protective shell of the electric actuator is imaged, recorded as the protective shell image of each time period. The protective shell image of each time period is grayed, and the gray value of each pixel point of the protective shell image of each time period is detected respectively. The number of difference pixels of the protective shell image of each time period is obtained by screening, recorded as N. f , f represents the number of the fth time period, f = 1, 2, ..., g, and the total pixel points N of the protective shell image are extracted at the same time 总 , through the formula Get the anti-corrosion performance of the electric actuator δ 腐蚀 , g represents the number of time cycles; it can visually monitor the changes of the protective shell in the corrosive environment, which helps to promptly discover the shortcomings of the protective shell in terms of corrosion protection so as to take improvement measures and improve product quality.

[0071] It should be noted that the specific analysis method for the number of different pixel points of the protective shell image in each time period is: read the gray value of each pixel point of the protective shell image in each time period, recorded as f represents the number of the fth time period, f=1,2,...,g, a represents the number of the ath pixel, a=1,2,...,b, and substitute it into the formula Get the grayscale difference of each pixel of the protective shell image in each time period Compare them with the preset grayscale difference threshold respectively. If the grayscale difference of a pixel point of the protective shell image in a certain time period is greater than or equal to the preset grayscale difference threshold, it means that the grayscale difference of the pixel point of the protective shell image in this time period is unqualified, and the pixel point is recorded as a difference pixel point. The number of difference pixels of the protective shell image in each time period is counted and recorded as N f .

[0072] The protection performance analysis module is used to obtain the protection performance of the electric actuator according to the protection performance parameters of the electric actuator and provide feedback thereto.

[0073] The specific analysis method of the protection performance analysis module is: read the dustproof performance δ of the electric actuator respectively尘 、Waterproof performance 水 、Corrosion resistance 腐蚀 , substituting it into the formula χ=δ 尘 *φ 3 +δ 水 *φ 4 +δ 腐蚀 *φ 5 Get the protection performance of the electric actuator χ, φ 3 ,φ 4 ,φ 5 The weight factors of the dustproof performance, waterproof performance and corrosion resistance of the preset electric actuator are respectively represented. The protection performance of the electric actuator is compared with the preset protection performance threshold. If the protection performance of the electric actuator is greater than or equal to the preset protection performance threshold, it means that the protection performance of the electric actuator is qualified. If the protection performance of the electric actuator is less than the preset protection performance threshold, it means that the protection performance of the electric actuator is unqualified, and feedback is given to the system. Timely feedback of unqualified situations is helpful to take improvement measures or adjust the production process in time, improve product quality, ensure the reliable operation of the electric actuator in different harsh environments, and enhance its adaptability and durability.

[0074] If it is to be noted, in a specific embodiment, φ 3 Can be set to 0.4, φ 4 Can be set to 0.3, φ 5 It can be set to 0.3. Dust and other particles entering the electric actuator may affect its normal operation, causing problems such as component wear and jamming. Especially in some dusty environments, good dustproof performance can ensure the reliability and durability of the equipment. Water intrusion may damage electronic components and cause short circuits and other faults. In humid environments or environments where water may be exposed, waterproof performance is crucial to the safe operation of the equipment. In some environments with corrosive media, such as the chemical industry, anti-corrosion performance can ensure that the electric actuator works stably for a long time and avoids corrosion damage. However, waterproof performance and anti-corrosion performance are not universally present in all scenarios, so the dustproof performance has the highest weight.

[0075] The management database is used to store the preset torque coefficients and valve design drawings corresponding to each valve type.

[0076] A second aspect of the present invention provides an electronic device, characterized in that the electric actuator includes a processor, a memory and a communication bus, and the memory stores a computer-readable program that can be executed by the processor.

[0077] The communication bus realizes the connection and communication between the processor and the memory.

[0078] When the processor executes the computer-readable program, the steps in the electric actuator control system according to the present invention are implemented.

[0079] The present invention obtains the torque coefficient corresponding to the valve type according to the valve type matching, obtains the expected torque value of the valve in combination with the torque coefficient corresponding to the fluid parameter, and adjusts the valve torque value accordingly, obtains the deviation distance of the valve detection point through the coordinate position, thereby adjusting the valve position, and determines whether the electric actuator is overloaded by analyzing the load degree of the electric actuator and takes action, obtains the protection performance of the electric actuator according to the protection performance parameter analysis of the electric actuator, and feeds back the protection performance, thereby realizing precise control and adjustment, and enhancing the safety and stability of the system.

[0080] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention and they are still covered by the protection scope of the present invention.

Claims

1. An electric actuator control system, characterized in that: The system specifically includes the following modules: The working condition parameter detection module is used to obtain the working condition parameters of the valve, and then analyze and obtain the torque coefficient corresponding to the fluid parameters. The working condition parameters include the temperature uniformity and flow rate fluctuation rate of the fluid; The working condition matching module is used to obtain the torque coefficient corresponding to the valve type according to the valve type matching, and at the same time detect the pressure difference between the two ends of the valve, and analyze the torque coefficient corresponding to the fluid parameters to obtain the expected torque value of the valve; The torque adjustment module is used to detect the actual torque value of the valve at each time point, obtain the torque difference of the valve at each time point by difference, and adjust the torque value of the valve at each time point based on this; The valve control module is used to obtain the deviation distance of the valve detection point through the coordinate position, determine whether the valve position is qualified, and then adjust the valve position; The overload protection module is used to detect the working parameters of the electric actuator, analyze the load level of the electric actuator, and then determine whether the electric actuator is overloaded and handle it. The working parameters include maximum current value, maximum voltage value, and power; The protection performance detection module is used to detect the protection performance parameters of the electric actuator, including dustproof performance, waterproof performance, and anti-corrosion performance; A protection performance analysis module is used to analyze the protection performance of the electric actuator according to the protection performance parameters of the electric actuator and provide feedback thereto; The management database is used to store the preset torque coefficients and valve design drawings corresponding to each valve type.

2. The electric actuator control system according to claim 1, characterized in that: The specific analysis method of the operating parameter detection module is: In the first step, several equally spaced measuring points are selected on the main channel of the fluid flow, and several time points are selected according to the set duration, which are recorded as each time point. The temperature of the fluid at each measuring point at each time point is detected by a temperature sensor, which is recorded as m represents the number of the mth measurement point, m = 1, 2, ..., q, i represents the number of the ith time point, i = 1, 2, ..., n, and the average temperature of the fluid at each time point is obtained by averaging the fluid temperatures at each measurement point, denoted as Substituting this into the formula The temperature uniformity of the fluid is obtained, α, q represents the number of measurement points, and n represents the number of time points; The second step is to divide the time period into fixed time periods and monitor the fluid flow rate in each time period through a flow meter, which is recorded as M x , x represents the number of the x-th time period, x = 1, 2, ..., y, and the fluid flow rate is obtained by taking the average value of the fluid flow rate in each time period, which is recorded as Substituting this into the formula The flow volatility σ is obtained, and y represents the number of time periods; The third step is to substitute the temperature uniformity α and flow rate fluctuation σ of the fluid into the formula The torque coefficient κ1 corresponding to the fluid parameters is obtained, φ1 and φ2 represent the correction factors of the preset temperature uniformity and flow rate fluctuation rate, and k0 represents the basic torque coefficient.

3. An electric actuator control system according to claim 2, characterized in that: The specific analysis method of the working condition matching module is: The valve type is obtained, and the torque coefficient corresponding to each preset valve type is read from the management database. The torque coefficient corresponding to the valve type is matched and recorded as κ2. Pressure sensors are installed at the inlet and outlet of the valve respectively. The fluid is started and adjusted to a normal working state. The pressure at the inlet and outlet of the valve is detected at each time point, which is recorded as P i 进 , P i 出 , through the formula The pressure difference ΔP at both ends of the valve is obtained, where n represents the number of time points. At the same time, the diameter of the valve is measured, recorded as D, and the formula is used The valve diameter area M is obtained, where π represents the pi, and is substituted into the formula τ=ΔP*M*κ1*κ2 to obtain the expected torque value τ of the valve, where κ1 represents the torque coefficient corresponding to the fluid parameters.

4. The electric actuator control system according to claim 3, characterized in that: The specific analysis method for adjusting the torque value of the valve at each time point is: The first step is to install the torque sensor on the output shaft of the electric actuator, obtain the actual torque value output by the electric actuator at each time point, and record it as the actual torque value of the valve at each time point; The second step is to read the expected torque value of the valve, and obtain the torque difference value of the valve at each time point by subtracting the actual torque value of the valve at each time point from the expected torque value of the valve; The third step is to read the torque difference of the valve at each time point, and compare the torque difference of the valve at each time point with the preset torque difference threshold. If the torque difference of the valve at a certain time point is not within the preset torque difference threshold, the actual torque value of the valve at that time point is adjusted to the expected torque value of the valve, otherwise no adjustment is required.

5. The electric actuator control system according to claim 1, characterized in that: The specific analysis method of the valve control module is: Extract the valve design drawing from the management database, read the set valve stem position from it, take any vertex of the valve stem as the detection point, record it as the valve stem detection point, obtain the position coordinates of the valve stem detection point, record it as (x, y), and use the position sensor to detect the current actual position of the valve stem detection point in real time, record it as (x', y'), and use the formula Obtain the deviation distance d of the valve detection point, and compare the deviation distance of the valve detection point with the preset deviation distance threshold. If the deviation distance of the valve detection point is greater than or equal to the preset deviation distance threshold, adjust the valve position; if the deviation distance of the valve detection point is less than the preset deviation distance threshold, it indicates that the valve position is qualified.

6. The electric actuator control system according to claim 5, characterized in that: The specific analysis method for adjusting the valve position is as follows: The first step is to read the deviation distance of the valve detection point and adjust the valve position according to the deviation distance of the valve detection point; The second step is to obtain the position coordinates of the valve detection point after the position adjustment again, and to analyze the deviation distance of the valve detection point after adjustment according to the method of analyzing the deviation distance of the valve detection point; In the third step, if the deviation distance of the valve detection point after adjustment is 0, it means that the adjustment is qualified. If the deviation distance of the valve detection point after adjustment is not 0, return to the first step until the deviation distance of the valve detection point after adjustment is 0.

7. The electric actuator control system according to claim 1, characterized in that: The specific analysis method of the overload protection module is: In the first step, several time points are selected within the working time of the electric actuator according to the set time, which are recorded as detection time points. The current value of the electric actuator at each detection time point is detected by the current sensor, which is recorded as I j , j represents the number of the jth detection time point, j = 1, 2, ..., k, and at the same time, the voltage value of each detection time point of the electric actuator is detected by the voltage sensor, which is recorded as V j , respectively, select the maximum value from the current value and voltage value of the electric actuator at each detection time point, and record it as the maximum current value I of the electric actuator max , Maximum voltage value V max , through the formula The power P of the electric actuator is obtained, and k represents the number of detection time points; The second step is to set the maximum current value I max , Maximum voltage value V max , power P, and substitute it into the formula Get the load level of the electric actuator I0, V0, and P0 represent the reference values ​​of the set current, voltage, and power respectively. The weight factors of the current, voltage and power of the preset electric actuator are respectively represented. The load degree of the electric actuator is compared with the preset load degree threshold. If the load degree of the electric actuator is greater than or equal to the preset load degree threshold, it means that the electric actuator is overloaded and the control system temporarily stops running. If the load degree of the electric actuator is less than the preset load degree threshold, it means that the electric actuator is working normally.

8. The electric actuator control system according to claim 1, characterized in that: The specific analysis method of the protection performance detection module is: In the first step, a dust generator is used to create a dust environment with a specific particle size and concentration. The protective housing of the electric actuator is placed in the dust environment for a set period of time, and the dust content inside the protective housing is detected by a dust particle counter, which is recorded as σ. Get the dustproof performance δ of the electric actuator 尘 , σ0 represents the set dust content reference value; The second step is to prepare water of a set weight, record its weight as M, immerse the protective shell of the electric actuator completely in the water, apply a set water pressure to it through a hydraulic pump, and remove the protective shell of the electric actuator from the water after maintaining the set time. Detect the weight of the water again, record it as M', and substitute it into the formula Waterproof performance of electric actuator 水 ; The third step is to obtain an image of the protective shell of the electric actuator, which is recorded as the protective shell image. The protective shell image is grayed, and the gray value of each pixel of the protective shell image is detected respectively. The initial gray value of the protective shell image is obtained by averaging the gray values ​​of each pixel of the protective shell image, which is recorded as A test box simulating a corrosive environment is built, the protective shell of the electric actuator is placed in it and a fixed time period is set. After each time period, the protective shell of the electric actuator is imaged, recorded as the protective shell image of each time period. The protective shell image of each time period is grayed, and the gray value of each pixel point of the protective shell image of each time period is detected respectively. The number of difference pixels of the protective shell image of each time period is obtained by screening, recorded as N. f , f represents the number of the fth time period, f = 1, 2, ..., g, and the total pixel points N of the protective shell image are extracted at the same time 总 , through the formula Get the anti-corrosion performance of the electric actuator δ 腐蚀 , g represents the number of time periods.

9. The electric actuator control system according to claim 1, characterized in that: The specific analysis method of the protection performance analysis module is: Read the dustproof performance of the electric actuator δ 尘 , waterproof performance 水 、Corrosion resistance 腐蚀 , substituting it into the formula χ=δ 尘 *φ3+δ 水 *φ4+δ 腐蚀 *φ5 obtains the protection performance χ of the electric actuator, φ3, φ4, and φ5 respectively represent the weight factors of the preset dustproof performance, waterproof performance, and corrosion resistance performance of the electric actuator. The protection performance of the electric actuator is compared with the preset protection performance threshold. If the protection performance of the electric actuator is greater than or equal to the preset protection performance threshold, it means that the protection performance of the electric actuator is qualified. If the protection performance of the electric actuator is less than the preset protection performance threshold, it means that the protection performance of the electric actuator is unqualified, and feedback is given to the system.

10. An electric actuator, characterized in that: The electric actuator comprises a processor, a memory and a communication bus, wherein the memory stores a computer-readable program executable by the processor; The communication bus realizes the connection and communication between the processor and the memory; When the processor executes the computer-readable program, the steps in the electric actuator control system as described in any one of claims 1 to 9 are implemented.

Images