Automatic production control system for liquid canning

Abstract

The invention relates to the technical field of filling, and discloses a liquid filling automatic production control system, which comprises an electromagnetic valve, a PLC control host, an electromagnetic valve monitoring module, a detection rule setting module and an analysis module, and is characterized in that the state of the electromagnetic valve is monitored through the electromagnetic valve monitoring module, and the state information data of the electromagnetic valve is acquired; setting a preset detection rule through a detection rule setting module; before filling, the PLC control host controls the current of the electromagnetic valve according to a preset detection rule through the analysis module to detect the electromagnetic valve, and analyzes the preset detection current and the state information data of the electromagnetic valve in the detection process to obtain a current stability index; the current of the electromagnetic valve is not stable, so that the flow of the electromagnetic valve is not stable, the flowing state of liquid flowing into a filling head is not stable, and more abrasion is caused to the filling head; therefore, before filling, the abnormality of the electromagnetic valve is detected in time, and the abrasion of the filling head caused by the abnormality of the electromagnetic valve can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of filling, and particularly relates to an automatic production control system for liquid canning. Background Art

[0002] With the development of technology, the industry is gradually transforming towards automation, intelligence, high efficiency and environmental protection. Existing canning production lines all rely on dedicated intelligent packaging equipment to achieve automatic production.

[0003] In the prior art, a fully automatic liquid quantitative canning robot with the publication number of "CN212269427U" includes a liquid adding pump, an infusion hose, a solenoid valve, a flow meter, a canning head and a PLC control host; during the process of canning liquid, the flow meter arranged on the infusion hose is used to detect the size of the liquid flow in real time, and the detected flow size data is transmitted to the PLC control host. The PLC control host processes the liquid flow size data and generates a flow regulation data instruction to be transmitted to the solenoid valve. After receiving the flow regulation data instruction, the solenoid valve can adjust the size of the liquid flow, and thus can change the length of each canning time.

[0004] However, the above technology still has relatively large defects. For example, when adjusting the flow rate in the above technology, the flow velocity and pressure of the liquid will change. During the adjustment process, the flow state of the liquid may become unstable, resulting in phenomena such as eddy currents and impacts. These unstable flow states may cause additional impacts and wear on the canning head; the wear of the canning head may lead to a decrease in the sealing performance between the bottle mouth and the canning head, thereby causing liquid leakage; the leaked liquid will not only cause waste, but also may pollute the equipment and the environment. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic production control system for liquid canning to solve the following technical problems: During the canning process, how to avoid the wear of the canning head caused by the unstable flow state of the canned liquid.

[0006] The purpose of the present invention can be achieved by the following technical solutions: An automatic production control system for liquid canning includes a solenoid valve and a PLC control host arranged between an infusion hose and a canning head. The control system further includes: A solenoid valve monitoring module for monitoring the state of the solenoid valve and obtaining solenoid valve state information data; the solenoid valve state information data includes the solenoid valve temperature and the actual current of the solenoid valve; A detection rule setting module for setting a preset detection rule; the preset detection rule includes a change curve of the preset detection current with the detection duration; An analysis module is used to, before filling, control the main machine through a PLC to detect the solenoid valve by controlling the current of the solenoid valve according to a preset detection rule, and analyze the preset detection current and the solenoid valve status information data during the detection process to obtain a current stability index for evaluating the current stability degree of the solenoid valve; then judge whether the solenoid valve is abnormal according to the current stability index; if it is abnormal, judge the repair type of the solenoid valve according to the solenoid valve status information data; if there is no abnormality, start filling.

[0007] As a further solution of the present invention: the obtaining process of the solenoid valve status index includes the following steps: S1: Before the start of filling, the PLC controls the main machine to adjust the current of the solenoid valve according to the change curve of the preset detection current with the detection duration; S2: Obtain the change curve of the actual current of the solenoid valve with the detection duration through the solenoid valve monitoring module; S3: The analysis module randomly selects several preset detection current values from the change curve of the preset detection current with the detection duration, and obtains the detection time zones corresponding to each preset detection current value; S4: Randomly select several time points in each detection time zone as the marked time points of the detection time zone; S5: Analyze by obtaining the actual current values corresponding to all the marked time points in each detection time zone to obtain a first stability index for evaluating the current fluctuation amplitude of the solenoid valve and a second stability index for evaluating the speed of current fluctuation of the solenoid valve; S6: Then analyze according to the first stability index and the second stability index to obtain the current stability index of the solenoid valve, and judge whether the solenoid valve is abnormal according to the current stability index; if it is abnormal, enter step S7; if there is no abnormality, start filling; S7: Obtain the cumulative working duration and the actual cumulative adjustment times of the solenoid valve according to the change curve of the actual current of the solenoid valve with time; then analyze according to the cumulative working duration, the actual cumulative adjustment times of the solenoid valve and the solenoid valve temperature to obtain the usage status index of the solenoid valve; S8: Analyze according to the usage status index of the solenoid valve to judge the repair type of the solenoid valve.

[0008] As a further solution of the present invention: the change curve of the preset detection current with the detection duration is: ; Among them, is the detection duration; is the unit duration; is the unit adjustment current amount.

[0009] As a further solution of the present invention: the detection time zones corresponding to each preset detection current value are ; wherein, is the th preset detected current value; is the detected time zone duration, .

[0010] As a further solution of the present invention: through the formula: calculate the first stability index ; wherein, is the first judgment function. When , ; when , ; is the number of preset detected current values randomly selected, ; is the number of labeled time points randomly selected within the detection time zone corresponding to the th preset detected current value, ; is the actual current value corresponding to the th labeled time point randomly selected within the detection time zone corresponding to the th preset detected current value; is the preset standard deviation.

[0011] As a further solution of the present invention: through the formula: calculate the second stability index ; wherein, is the curve of the actual current varying with time in the detection time zone corresponding to the th preset detected current value; is the th labeled time point randomly selected within the detection time zone corresponding to the th preset detected current value; is the preset slope.

[0012] As a further solution of the present invention: through the formula: calculate the current stability index of the solenoid valve .

[0013] As a further solution of the present invention: the judgment process for whether the solenoid valve is abnormal is: When , the solenoid valve is abnormal; When , the solenoid valve is normal.

[0014] As a further solution of the present invention: By the formula: Calculate the usage status index of the solenoid valve ; Wherein, is the number of adjustment times of the solenoid valve during the actual cumulative working time; is the preset basic adjustment times of the solenoid valve; is the environmental usage adjustment coefficient; is the number of maintenance times within the past preset time period; is the third preset constant.

[0015] As a further solution of the present invention: By the formula: Calculate the environmental usage adjustment coefficient Wherein, is the second judgment function. When , ; When , ; is the preset temperature of the solenoid valve; is the actual cumulative working time of the solenoid valve; is the change curve of the solenoid valve with the actual cumulative working time; is the preset adjustment frequency of the solenoid valve; is the first adjustment weight coefficient, is the second adjustment weight coefficient, ; is the first preset constant; is the second preset constant.

[0016] As a further solution of the present invention: The process of judging the maintenance type of the solenoid valve is as follows; Compare the usage status index of the solenoid valve with the preset value , When , the solenoid valve is seriously abnormal and needs to be replaced; When , the solenoid valve is slightly abnormal and needs to be repaired.

[0017] The beneficial effects of the present invention: (1) The present invention monitors the status of the solenoid valve through the solenoid valve monitoring module to obtain the solenoid valve status information data; sets the preset detection rules through the detection rule setting module; and then, before filling, the analysis module controls the current of the solenoid valve according to the preset detection rules through the PLC control host to detect the solenoid valve, and analyzes the preset detection current and the solenoid valve status information data during the detection process to obtain a current stability index for evaluating the current stability degree of the solenoid valve. Unstable solenoid valve current will lead to unstable flow rate of the solenoid valve, thus resulting in unstable flow state of the liquid flowing into the filling head, which will cause more wear to the filling head. Therefore, detecting the abnormality of the solenoid valve in time before filling can reduce the wear caused to the filling head due to the abnormality of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a system module framework diagram of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figure 1 As shown, in one embodiment, a liquid canning automatic production control system is provided, which includes a solenoid valve and a PLC control host arranged between the infusion hose and the filling head. The control system further includes: A solenoid valve monitoring module for monitoring the status of the solenoid valve and obtaining the solenoid valve status information data; the solenoid valve status information data includes the solenoid valve temperature and the actual current of the solenoid valve; A detection rule setting module for setting the preset detection rules; the preset detection rules include the change curve of the preset detection current with the detection duration; An analysis module for, before filling, controlling the current of the solenoid valve according to the preset detection rules through the PLC control host to detect the solenoid valve, and analyzing the preset detection current and the solenoid valve status information data during the detection process to obtain a current stability index for evaluating the current stability degree of the solenoid valve; then judging whether the solenoid valve is abnormal according to the current stability index; if abnormal, judging the repair type of the solenoid valve according to the solenoid valve status information data; if not abnormal, starting filling; Through the above technical solution, in this embodiment, the solenoid valve monitoring module monitors the state of the solenoid valve to obtain the solenoid valve state information data; the detection rule setting module sets the preset detection rules; and then, before filling, the analysis module controls the current of the solenoid valve according to the preset detection rules through the PLC control host to detect the solenoid valve, and analyzes the preset detection current and the solenoid valve state information data during the detection process to obtain a current stability index for evaluating the current stability degree of the solenoid valve. Unstable solenoid valve current will cause unstable flow rate of the solenoid valve, resulting in unstable flow state of the liquid flowing into the filling head, which will cause more wear on the filling head. Therefore, detecting the abnormality of the solenoid valve in time before filling can reduce the wear on the filling head caused by the abnormality of the solenoid valve.

[0022] As an implementation manner of the present invention, the process of obtaining the solenoid valve state index includes the following steps: S1: Before the filling starts, the PLC control host adjusts the current of the solenoid valve according to the change curve of the preset detection current with the detection duration. S2: Obtain the change curve of the actual current of the solenoid valve with the detection duration through the solenoid valve monitoring module. S3: Randomly select several preset detection current values from the change curve of the preset detection current with the detection duration through the analysis module, and obtain the detection time zones corresponding to each preset detection current value. S4: Randomly select several time points in each detection time zone as the marked time points of the detection time zone. S5: Analyze by obtaining the actual current values corresponding to all the marked time points in each detection time zone to obtain a first stability index for evaluating the current fluctuation amplitude of the solenoid valve and a second stability index for evaluating the speed of current fluctuation of the solenoid valve. S6: Then analyze according to the first stability index and the second stability index to obtain the current stability index of the solenoid valve, and judge whether the solenoid valve is abnormal according to the current stability index. If it is abnormal, go to step S7; if it is not abnormal, start filling. S7: Obtain the cumulative working duration and the actual cumulative adjustment times of the solenoid valve according to the change curve of the actual current of the solenoid valve with time. Then analyze according to the cumulative working duration, the actual cumulative adjustment times and the solenoid valve temperature of the solenoid valve to obtain the usage state index of the solenoid valve. S8: Analyze according to the usage state index of the solenoid valve to judge the maintenance type of the solenoid valve. Through the above technical solution, before the start of filling, the PLC control host adjusts the current of the solenoid valve according to the preset detection current change curve with the detection duration; then obtains the actual current change curve of the solenoid valve with the detection duration through the solenoid valve monitoring module; subsequently, the analysis module randomly selects several preset detection current values in the preset detection current change curve with the detection duration, and obtains the detection time zones corresponding to each preset detection current value; randomly selects several time points in each detection time zone as the marked time points of the detection time zone; then analyzes by obtaining the actual current values corresponding to all the marked time points in each detection time zone to obtain a first stability index for evaluating the current fluctuation amplitude of the solenoid valve and a second stability index for evaluating the speed of the current fluctuation of the solenoid valve; then analyzes according to the first stability index and the second stability index to obtain the current stability index of the solenoid valve, and judges whether the solenoid valve is abnormal according to the current stability index; if it is abnormal, obtains the cumulative working duration and the actual cumulative adjustment times of the solenoid valve according to the actual current change curve of the solenoid valve with time; then analyzes according to the cumulative working duration, the actual cumulative adjustment times of the solenoid valve and the solenoid valve temperature to obtain the usage status index of the solenoid valve; finally, analyzes according to the usage status index of the solenoid valve to judge the repair type of the solenoid valve; if there is no abnormality, start filling; detecting the abnormality of the solenoid valve in time before filling can reduce the wear of the filling head caused by the abnormality of the solenoid valve.

[0023] It should be noted that obtaining the cumulative working duration and the actual cumulative adjustment times of the solenoid valve according to the actual current change curve of the solenoid valve with time is a prior art and will not be elaborated here.

[0024] As an implementation manner of the present invention, the preset detection current change curve with the detection duration is: ; Wherein, is the detection duration; is the unit duration; is the unit adjustment current amount; The detection time zones corresponding to each preset detection current value are ; Wherein, is the th preset detection current value; is the detection time zone duration, ; Through the above technical solution, the preset current change curve with the detected duration of this embodiment is ; Therefore, when the detection duration is ), the preset detection current value is ; Therefore, setting the preset detection current value to as ; It should be noted that the unit time length , the detection time zone length and the unit regulated current are preset values, obtained based on experience and will not be elaborated here.

[0025] As an implementation manner of the present invention, through the formula:

[0026] Calculate the first stability index ; Wherein, is the first judgment function. When is the case, ; when is the case, ; is the number of preset detection current values randomly selected, ; is the number of labeled time points randomly selected within the detection time zone corresponding to the th preset detection current value, ; is the actual current value corresponding to the th labeled time point randomly selected within the detection time zone corresponding to the th preset detection current value; is the preset standard deviation; Through the above technical solution, in this embodiment is the standard deviation of the actual current values corresponding to the randomly selected labeled time points within the detection time zone corresponding to the th preset detection current value, reflecting the fluctuation amplitude of the actual current within the detection time zone corresponding to the th preset detection current value; is the first difference between the standard deviation of the actual current values corresponding to the randomly selected labeled time points within the detection time zone corresponding to the th preset detection current value and the preset standard deviation; in the formula , the first judgment function in refers to , used to judge whether the standard deviation of the actual current values corresponding to the randomly selected labeled time points within the detection time zone corresponding to the th preset detection current value exceeds the preset standard deviation. When is the case, it indicates that within the detection time zone corresponding to the randomly selected within the detection time zone corresponding to a preset detection current value the standard deviation of the actual current values corresponding to the marked time points exceeds the preset standard deviation. At the within the detection time zone corresponding to the preset detection current value, the fluctuation range of the actual current is large and the actual current is unstable. Therefore ; when it indicates that within the detection time zone corresponding to the preset detection current value, the standard deviation of the actual current values corresponding to the randomly selected marked time points does not exceed the preset standard deviation. At the within the detection time zone corresponding to the preset detection current value, the fluctuation range of the actual current is small and the actual current is stable, ; through the formula to evaluate whether the actual current of the solenoid valve is stable from the fluctuation range of the actual current of the solenoid valve; thereby judging whether the state of the solenoid valve is abnormal; It should be noted that the preset standard deviation is a preset value, obtained based on experience and not elaborated here.

[0027] As an implementation manner of the present invention, through the formula:

[0028] calculate the second stability index ; where is the curve of the actual current changing with time in the detection time zone corresponding to the preset detection current value; is the randomly selected marked time point in the detection time zone corresponding to the preset detection current value; Through the above technical solution, in this embodiment is the absolute value of the slope at the marked time point on the curve of the actual current changing with time in the detection time zone corresponding to the preset detection current value, used to reflect the changing speed of the actual current in the detection time zone corresponding to the preset detection current value; is the average value of the absolute values of the slopes at the marked time points on the curve of the actual current changing with time in the detection time zone corresponding to the on the curve of the actual current over time in the detection time zone corresponding to a preset detection current value the average value of the absolute values of the slopes at a number of marked time points and the second difference from the preset slope; in the formula in refers to , and is used to determine whether the average value of the absolute values of the slopes at a number of marked time points on the curve of the actual current over time in the detection time zone corresponding to a preset detection current value exceeds the preset slope. When , it indicates that the average value of the absolute values of the slopes at a number of marked time points on the curve of the actual current over time in the detection time zone corresponding to a preset detection current value exceeds the preset slope, and the change rate of the actual current in the detection time zone corresponding to the -th preset detection current value is relatively fast, and the actual current is unstable. Therefore ; when , it indicates that the average value of the absolute values of the slopes at a number of marked time points on the curve of the actual current over time in the detection time zone corresponding to a preset detection current value does not exceed the preset slope, and the change rate of the actual current in the detection time zone corresponding to the -th preset detection current value is relatively slow, and the actual current is stable, ; through the formula to evaluate whether the actual current of the solenoid valve is stable from the change rate of the actual current of the solenoid valve; thereby judging whether the state of the solenoid valve is abnormally severe; It should be noted that the preset slope is a preset value obtained based on experience and will not be elaborated here.

[0029] As an implementation manner of the present invention, through the formula:

[0030] calculate the current stability index of the solenoid valve ; As an implementation manner of the present invention, the judgment process for whether the solenoid valve is abnormal is: When , the solenoid valve is abnormal; When , the solenoid valve is not abnormal; Through the above technical solution, when and , that is When it indicates that the fluctuation amplitude of the solenoid valve during the solenoid valve detection process is stable and the fluctuation speed is slow, so there is no abnormality in the solenoid valve; when or When it indicates that the fluctuation amplitude of the solenoid valve during the solenoid valve detection process is large or the fluctuation speed is fast, so the solenoid valve is abnormal.

[0031] As an implementation manner of the present invention, through the formula: Calculate the usage status index of the solenoid valve ; Wherein, is the number of adjustment times of the solenoid valve during the actual cumulative working time; is the preset basic adjustment times of the solenoid valve; is the environmental usage adjustment coefficient; is the number of maintenance times within the past preset time period; is the third preset constant; Through the above technical solution, in this embodiment is the preset adjustment times of the solenoid valve during the actual cumulative working time. When the actual cumulative working environment is unfavorable to the solenoid valve, the environmental usage adjustment coefficient is smaller, and the preset adjustment times of the solenoid valve during the actual cumulative working time decrease; when the actual cumulative working environment has no adverse effect on the solenoid valve, the environmental usage adjustment coefficient is 1, and the preset adjustment times of the solenoid valve during the actual cumulative working time is the preset basic adjustment times; is the ratio of the adjustment times of the solenoid valve during the actual cumulative working time to the preset adjustment times of the solenoid valve during the actual cumulative working time. The larger the ratio, the worse the state of the solenoid valve, and the usage status index of the solenoid valve is larger. The larger the number of maintenance times within the past preset time period, it indicates that the solenoid valve is abnormal more frequently, the state of the solenoid valve is worse, and the usage status index of the solenoid valve is larger; It should be noted that the preset adjustment times of the solenoid valve is obtained according to the solenoid valve model, and the third preset constant is a preset value, obtained according to experience, and will not be elaborated here.

[0032] As an implementation manner of the present invention, through the formula: Calculate the environmental usage adjustment coefficient Wherein, is the second judgment function. When When it is ; when When ; is the preset temperature of the solenoid valve; is the actual cumulative working time of the solenoid valve; is the change curve of the solenoid valve with the actual cumulative working time; is the preset adjustment frequency of the solenoid valve; is the first adjustment weight coefficient, is the second adjustment weight coefficient, ; is the first preset constant; is the second preset constant; Through the above technical solution, in this embodiment is the average temperature of the solenoid valve within the actual cumulative working time; is the difference between the average temperature of the solenoid valve within the actual cumulative working time and the preset temperature of the solenoid valve; In the formula the second judgment function in refers to which is used to judge whether the average temperature of the solenoid valve within the actual cumulative working time exceeds the preset temperature of the solenoid valve. When it indicates that the average temperature of the solenoid valve within the actual cumulative working time exceeds the preset temperature of the solenoid valve. The high temperature of the solenoid valve is likely to accelerate the aging degree of the solenoid valve. The preset adjustment times of the solenoid valve after working for the actual cumulative working time should be reduced. Therefore ; The difference between the average temperature of the solenoid valve within the actual cumulative working time and the preset temperature of the solenoid valve the larger it is, the greater the aging risk of the solenoid valve and the greater the adverse impact on the solenoid valve. Therefore, the environmental use adjustment coefficient is smaller; When it indicates that the average temperature of the solenoid valve within the actual cumulative working time does not exceed the preset temperature of the solenoid valve, and there is no adverse impact on the solenoid valve, ; is the average adjustment frequency of the solenoid valve within the actual cumulative working time, is the difference between the average adjustment frequency of the solenoid valve within the actual cumulative working time and the preset adjustment frequency. In the formula the second judgment function in refers to which is used to judge whether the average adjustment frequency of the solenoid valve within the actual cumulative working time exceeds the preset adjustment frequency. When When it indicates that the average adjustment frequency of the solenoid valve during the actual cumulative working time exceeds the preset adjustment frequency, the excessive adjustment frequency of the solenoid valve will increase the rapid wear of the mechanical part of the solenoid valve. The preset adjustment times of the solenoid valve after working for the actual cumulative working time should be reduced. Therefore, ; the difference between the average adjustment frequency and the preset adjustment frequency of the solenoid valve during the actual cumulative working time is larger, indicating that the adverse impact on the solenoid valve is greater. Therefore, the environmental use adjustment coefficient is smaller; when it indicates that the average adjustment frequency of the solenoid valve during the actual cumulative working time does not exceed the preset adjustment frequency, the wear degree of the mechanical part of the solenoid valve is normal, and there is no adverse impact on the solenoid valve. ; It should be noted that the preset adjustment frequency of the solenoid valve is a preset value, obtained according to the solenoid valve model. The first adjustment weight coefficient , the second adjustment weight coefficient , the first preset constant and the second preset constant are preset values, obtained according to experience and will not be elaborated here.

[0033] As an implementation manner of the present invention, the process of judging the maintenance type of the solenoid valve is as follows; Compare the use status index of the solenoid valve with the preset value . When the solenoid valve is seriously abnormal and needs to be replaced; When the solenoid valve is slightly abnormal and needs to be repaired; Through the above technical solution, in this embodiment, the use status index of the solenoid valve is compared with the preset value . When the solenoid valve is seriously abnormal and needs to be replaced; when the solenoid valve is slightly abnormal and needs to be repaired.

[0034] The maintenance types include serious abnormality and slight abnormality.

[0035] It should be noted that the preset value is a preset value, obtained according to experience and will not be elaborated here.

[0036] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A liquid canning automated production control system, comprising a solenoid valve and a PLC control host arranged between an infusion hose and a filling head, characterized in that: The control system further comprises: A solenoid valve monitoring module is used to monitor the state of the solenoid valve and obtain solenoid valve state information data; the solenoid valve state information data includes the solenoid valve temperature and the actual current of the solenoid valve; A detection rule setting module, used to set a preset detection rule; the preset detection rule includes a curve of a change of a preset detection current with a detection time; The analysis module is used to control the current of the solenoid valve to detect the solenoid valve according to the preset detection rules through the PLC control host before filling, and analyze the preset detection current and the solenoid valve status information data during the detection process to obtain the current stability index used to evaluate the current stability of the solenoid valve; then judge whether the solenoid valve is abnormal according to the current stability index; if abnormal, judge the maintenance type of the solenoid valve according to the solenoid valve status information data; if there is no abnormality, start filling.

2. The liquid canning automated production control system according to claim 1, characterized in that: The process of obtaining the solenoid valve state index comprises the following steps: S1: Before filling begins, the PLC control host adjusts the current of the solenoid valve according to the preset curve of the change of detection current with detection time; S2: Obtain the curve of the actual current of the solenoid valve changing with the detection time through the solenoid valve monitoring module; S3: randomly selecting a number of preset detection current values ​​from a curve of a preset detection current changing with detection time through an analysis module, and obtaining a detection time zone corresponding to each preset detection current value; S4: Randomly select a number of time points in each detection time zone as the marked time points of the detection time zone; S5: obtaining the actual current values ​​corresponding to all the marked time points in each detection time zone for analysis, thereby obtaining a first stability index for evaluating the current fluctuation amplitude of the solenoid valve and a second stability index for evaluating the current fluctuation speed of the solenoid valve; S6: Analyze the first stability index and the second stability index to obtain the current stability index of the solenoid valve, and determine whether the solenoid valve is abnormal according to the current stability index; if it is abnormal, proceed to step S7; if it is normal, start filling; S7: Obtain the cumulative working time and actual cumulative adjustment times of the solenoid valve according to the curve of the actual current of the solenoid valve changing with time; then analyze the cumulative working time, actual cumulative adjustment times and temperature of the solenoid valve to obtain the use status index of the solenoid valve; S8: Analyze the solenoid valve's usage status index to determine the type of maintenance required for the solenoid valve.

3. A liquid canning automated production control system according to claim 2, characterized in that the curve of the preset detection current changing with the detection time is: ； in, is the detection duration; is the unit duration; Adjust the current in units.

4. The liquid canning automated production control system according to claim 3, characterized in that: The detection time zones corresponding to the preset detection current values ​​are: ； in, For the A preset detection current value; To detect the time zone duration, .

5. The liquid canning automated production control system according to claim 4, characterized in that: By formula: Calculate the first stability index ; in, is the first judgment function, when hour, ;when hour, ; is the number of preset detection current values ​​randomly selected, ; For the The number of randomly selected annotated time points in the detection time zone corresponding to the preset detection current value, ; For the The first value randomly selected in the detection time zone corresponding to the preset detection current value The actual current value corresponding to the marked time point; is the preset standard deviation.

6. The liquid canning automated production control system according to claim 5, characterized in that: By formula: Calculate the second stability index ; in, For the A curve of actual current variation over time in the detection time zone corresponding to a preset detection current value; For the The first randomly selected detection time zone corresponding to the preset detection current value Marked time points; is the preset slope.

7. The liquid canning automated production control system according to claim 6, characterized in that: By formula: Calculating the Current Stability Index of a Solenoid Valve .

8. The liquid canning automated production control system according to claim 7, characterized in that: The process of judging whether the solenoid valve is abnormal is as follows: when When the solenoid valve is abnormal; when hour; There is no abnormality with the solenoid valve.

9. The liquid canning automated production control system according to claim 8, characterized in that: By formula: ； Calculate the solenoid valve usage status index ; in, It is the number of times the solenoid valve is adjusted during the actual cumulative working time; It is the preset basic adjustment times of the solenoid valve; Use adjustment factors for the environment; The number of inspections within a preset time period in the past; is the third preset constant.

10. The liquid canning automated production control system according to claim 9, characterized in that: By formula: ； Calculate the environment usage adjustment factor ; in, is the second judgment function, when hour, ;when hour, ; is the preset temperature of the solenoid valve; is the actual accumulated working time of the solenoid valve; It is the curve of the solenoid valve changing with the actual accumulated working time; It is the preset adjustment frequency of the solenoid valve; is the first adjustment weight coefficient, is the second adjustment weight coefficient, ; is the first preset constant; is the second preset constant.

11. The liquid canning automated production control system according to claim 10, characterized in that: The process of determining the maintenance type of the solenoid valve is as follows; The solenoid valve usage status index With the default value For comparison, when When the solenoid valve is seriously abnormal, it needs to be replaced; when The solenoid valve is slightly abnormal and needs to be repaired.

Images