A gate for farmland irrigation canal

Abstract

The present invention relates to the technical field of regulating gates, and in particular to a gate for farmland irrigation canals. The gate includes a gate mechanism, a filter assembly and a filter adjustment module, and the filter adjustment module includes a data acquisition module, an adjustment analysis module and a control module; the data acquisition module is used to collect the pre-filter capacitance value and the post-filter capacitance value before and after the filter assembly, and transmit them to the adjustment analysis module; the adjustment analysis module is used to determine the filter balance by the difference in capacitance value before and after the filter assembly, and determine the water flow pressure characterization degree reflecting the upstream in combination with the change in the pre-filter capacitance value, determine the filter hole adjustment coefficient and transmit it to the control module to control the gate mechanism and the filter assembly. The present invention takes into account the change in filtration rate and the pre-filter water flow pressure, comprehensively analyzes and adaptively regulates the filter hole size, and improves the high efficiency and safety of gate filtration.

Description

Technical Field

[0001] The invention relates to the technical field of regulating gates, and in particular to a gate for a farmland irrigation canal. Background Art

[0002] In the process of agricultural modernization, the efficiency and precision of farmland irrigation systems are of vital importance to increasing crop yields, optimizing water resource utilization and protecting the ecological environment. Intelligent integrated farmland irrigation canal gates can greatly improve the efficiency and convenience of irrigation. The gates are also equipped with an efficient filtration system that can effectively remove impurities and harmful substances in the water, ensure the purity and safety of irrigation water, and provide strong protection for the healthy growth of crops.

[0003] However, since the water quality of agricultural irrigation canals cannot be guaranteed, a large number of impurities can easily lead to blockage of the filter holes. The commonly used fixed filtration system cannot guarantee the efficiency of filtration and safe and reliable operation. Summary of the invention

[0004] In order to solve the technical problem that the fixed filtering system in the prior art cannot guarantee the filtering efficiency and safe and reliable operation, the purpose of the present invention is to provide a gate for farmland irrigation canals, and the technical scheme adopted is as follows:

[0005] The present invention provides a gate for a farmland irrigation canal, the main body of which includes a gate mechanism, a filter assembly and a filter adjustment module, the filter adjustment module includes a data acquisition module, a regulation analysis module and a control module;

[0006] The signal output end of the data acquisition module is connected to the signal input end of the adjustment and analysis module, and the signal output end of the adjustment and analysis module is connected to the signal input end of the control module;

[0007] The data acquisition module is used to respectively collect the pre-filter capacitance value and the post-filter capacitance value corresponding to the capacitive sensors before and after the filter component, and transmit the pre-filter capacitance value and the post-filter capacitance value at each moment in the historical time period to the adjustment analysis module;

[0008] The adjustment analysis module is used to obtain the filtering balance at the current moment according to the stability of the changing trend of the difference between the capacitance value before filtering and the capacitance value after filtering at the moment in the historical time period;

[0009] In the historical time period, the water flow pressure representation degree at the current moment is obtained according to the stability and continuity of the pre-filter capacitance value and the sudden increase and change of the pre-filter capacitance value;

[0010] According to the current filtering balance and water flow pressure characterization, the current filtering hole adjustment coefficient is obtained; the current filtering hole adjustment coefficient and the post-filter capacitance value are transmitted to the control module for controlling the filtering component and the gate mechanism.

[0011] Furthermore, the method for obtaining the filtering balance includes:

[0012] The difference between the capacitance value before filtering and the capacitance value after filtering at each moment is taken as the capacitance difference at each moment;

[0013] Divide the historical time period into a preset number of change periods; obtain the change trend of each change period according to the continuous change degree of the capacitance difference in each change period;

[0014] The filtering balance at the current moment is obtained according to the change trend degree between the first change period and the last change period in time sequence and the difference in the overall capacitance difference.

[0015] Further, obtaining the degree of change trend of each change period according to the degree of continuous change of the capacitance difference in each change period includes:

[0016] For any change period, in the change period, the difference between the capacitance difference at the latter moment and the capacitance difference at the previous moment in each of two adjacent moments is taken as the adjacent change;

[0017] Combine all adjacent changes in the change period to obtain the change trend degree of the change period.

[0018] Furthermore, the filtering balance at the current moment is obtained according to the difference in the change trend between the first change period and the last change period in time sequence and the overall capacitance difference, including:

[0019] Calculate the average value of the capacitance difference corresponding to all moments in each change period as the average capacitance difference of each change period;

[0020] The capacitance difference distribution index of each change period is obtained by multiplying the average capacitance difference of each change period by the change trend degree;

[0021] The difference in the capacitance difference distribution index between the first change period and the last change period in the time sequence is negatively correlated and normalized to obtain the filtering balance at the current moment.

[0022] Furthermore, the method for obtaining the water flow pressure characterization degree includes:

[0023] According to the distribution disorder and distribution size of the pre-filter capacitance values ​​at all times in the historical time period, the stability continuity at the current moment is obtained;

[0024] According to the incremental changes of the pre-filter capacitance value at consecutive moments in the historical time period, the change growth degree at the current moment is obtained;

[0025] The water flow pressure characterization degree at the current moment is obtained by combining the stability continuity and change growth degree at the current moment.

[0026] Furthermore, the stability continuity at the current moment is obtained according to the distribution disorder and distribution size of the pre-filter capacitance values ​​corresponding to all moments in the historical time period, including:

[0027] The mean of the pre-filter capacitance values ​​at all times in the historical time period is used as the pre-filter distribution index at the current time;

[0028] The variance of the pre-filter capacitance value at all moments in the historical time period is used as the pre-filter chaos index at the current moment;

[0029] The product of the negative correlation mapping value of the pre-filter chaos index and the pre-filter distribution index is calculated as the stability continuity at the current moment.

[0030] Furthermore, the step of obtaining the change growth rate at the current moment according to the incremental change of the pre-filter capacitance value at consecutive moments in the historical time period includes:

[0031] In the historical time period, the ratio of the pre-filter capacitance value at the later moment to the pre-filter capacitance value at the previous moment in the time sequence of each two adjacent moments is taken as the growth ratio;

[0032] The average of all growth ratios in the historical time period is taken as the change growth rate at the current moment.

[0033] Furthermore, the method for obtaining the filter hole adjustment coefficient includes:

[0034] The product of the negative correlation mapping value of the filtering balance degree at the current moment and the water flow pressure representation degree is normalized to obtain the adjustment degree at the current moment;

[0035] The sum of the adjustment degree and the preset adjustment value is used as the filter hole adjustment coefficient; the preset adjustment value is a positive number less than 1.

[0036] Furthermore, the present filtering hole adjustment coefficient and the post-filter capacitance value are transmitted to the control module for controlling the filtering component and the gate mechanism, including:

[0037] The product of the hole size at the previous moment in time series and the filter hole adjustment coefficient is used as the hole size of the filter component at the current moment;

[0038] If the post-filter capacitance value at the current moment is equal to the preset stop-drain threshold, the gate mechanism controls the stop-drain.

[0039] Furthermore, the present moment water flow pressure characterization degree is obtained by combining the stability continuity degree and the change growth degree at the present moment, including:

[0040] The product of the stability continuity and the change growth at the current moment is used as the representation of the water flow pressure at the current moment.

[0041] The present invention has the following beneficial effects:

[0042] The present invention characterizes the water level by analyzing the difference in capacitance values ​​before and after the filter assembly, determines the filtration balance by the difference in water level changes over historical time periods, and determines the water flow pressure characterization degree reflecting the upstream in combination with the change in capacitance value before filtration, and determines the filter hole adjustment coefficient by combining the two aspects to reflect the degree of adjustment of the filter hole size at the current moment, and adjusts the filtration degree adaptively according to the filter speed change and pressure degree, thereby improving the water flow efficiency of the hole filtration. The present invention considers the filter rate change and the water flow pressure before filtration, comprehensively analyzes and adaptively regulates the filter hole size, and improves the efficiency and safety of gate filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A flow chart of a gate filtering control method provided by one embodiment of the present invention;

[0045] Figure 2 A schematic diagram of a gate for a farmland irrigation canal provided by an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of an adjustment mechanism for a gate for a farmland irrigation canal provided by an embodiment of the present invention;

[0047] Figure 4 A partial schematic diagram of a filter assembly of a gate for a farm irrigation canal provided by an embodiment of the present invention;

[0048] Figure 5 A gate for a farmland irrigation canal provided by an embodiment of the present invention Figure 4 The enlarged schematic diagram at A in the middle;

[0049] Figure 6 A flow chart of a method for obtaining filtering balance provided by an embodiment of the present invention;

[0050] Figure 7 A flow chart of a method for obtaining a water flow pressure representation degree provided by an embodiment of the present invention;

[0051] In conjunction with the accompanying drawings, the following reference numerals are marked: 1. gate frame; 101. first card slot; 102. second card slot; 103. connecting plate; 2. mounting plate; 3. filter assembly; 301. filter plate; 302. collecting plate; 303. opening and closing plate; 304. first card block; 305. second card block; 4. gate; 401. first baffle; 411. sealing block; 412. connecting rod; 402. second baffle; 403. third baffle; 5. Adjusting mechanism; 501, first stepping motor; 502, first screw; 503, bearing seat; 504, moving block; 505, linkage rod; 601, second stepping motor; 603, first sealing plate; 604, second sealing plate; 606, third screw; 607, second mounting seat; 608, third sealing plate; 609, third stepping motor; 7, post-filter capacitive sensor; 8, pre-filter capacitive sensor; 9, PLC controller; 10, pipeline valve. DETAILED DESCRIPTION

[0052] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation, structure, features and effects of a gate for farmland irrigation canals proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0053] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0054] The following is a detailed description of a specific scheme of a gate for farmland irrigation canals provided by the present invention in conjunction with the accompanying drawings. Figure 2 , which shows a schematic diagram of a gate for a farmland irrigation canal provided by an embodiment of the present invention; Figure 3 , which shows a schematic diagram of an adjustment mechanism of a gate for a farmland irrigation canal provided by an embodiment of the present invention; Figure 4 , which shows a partial schematic diagram of a filter assembly of a gate for a farm irrigation canal provided by an embodiment of the present invention; Figure 5 , which shows a gate for a farmland irrigation canal provided by an embodiment of the present invention Figure 4The enlarged schematic diagram at A in the middle shows that the gate includes: 1. gate frame; 101. first card slot; 102. second card slot; 103. connecting plate; 2. mounting plate; 3. filter assembly; 301. filter plate; 302. collection plate; 303. opening and closing plate; 304. first card block; 305. second card block; 4. gate mechanism; 401. first baffle; 411. sealing block; 412. connecting rod; 402. second baffle; 403. third baffle; 5 , adjusting mechanism; 501, first stepper motor; 502, first screw; 503, bearing seat; 504, moving block; 505, linkage rod; 601, second stepper motor; 603, first sealing plate; 604, second sealing plate; 606, third screw; 607, second mounting seat; 608, third sealing plate; 609, third stepper motor; 7, post-filter capacitive sensor; 8, pre-filter capacitive sensor; 9, PLC controller; 10, pipeline valve.

[0055] The data acquisition module collects the pre-filter capacitance value through the pre-filter capacitive sensor 8, and the post-filter capacitance value through the post-filter capacitive sensor 7. The pre-filter capacitive sensor 8 and the post-filter capacitive sensor 7 are distributed on both sides of the filter plate 301 to monitor the capacitance value before and after filtering. In the embodiment of the present invention, the historical time period is set to the time period 10 minutes before the current moment, and the filtering situation that needs to be adjusted at the current moment is monitored through the historical time period. The length of the specific historical time period can be adjusted by the implementer according to the implementation scenario. In other embodiments of the present invention, multiple capacitive sensors can be set on both sides, and the average of the data collected on each side is used as the pre-filter capacitance value or the post-filter capacitance value at each moment, which will not be elaborated here.

[0056] The data acquisition module transmits the collected capacitance value to the adjustment analysis module, analyzes the filter adjustment situation, and transmits the analysis result filter hole adjustment coefficient to the control module for control. There are adjustable filter holes in the filter plate 301, which are adjusted by the second stepping motor 601. The gate mechanism 4 can control the stop of discharge through the baffle.

[0057] For canals, when the water volume in the upstream increases dramatically due to weather or human intervention, improper filtration apertures will cause the filter assembly 3 to face huge pressure, and the filter apertures may even be blocked by debris in the water. To alleviate the pressure problem faced by the filter assembly 3 and avoid canal overflow, please refer to Figure 1 , which shows a flow chart of a gate filtering control method provided by an embodiment of the present invention, the method comprising the following steps:

[0058] S1: Obtain the filtering balance at the current moment according to the stability of the changing trend of the difference between the capacitance value before filtering and the capacitance value after filtering in the historical time period.

[0059] By judging the change of filtration speed due to actual water flow conditions under the current default hole size based on the change of filtration speed in the historical time period, when the overall filtration speed tends to speed up or slow down, it means that due to the change of current water flow, the current filter plate hole size has an impact on water filtration, and the filter plate hole size should be reduced or increased to meet the balance between water flow and irrigation after filtration.

[0060] The capacitive water level sensor can reflect the capacitance change caused by the change of water level. Usually, when the water level rises, the proportion of liquid in the capacitor increases, and the capacitance value increases. In the historical time period, according to the change trend of the capacitance value before and after filtration, the change trend of the partial filtration rate before the current moment is reflected, and the filtration balance performance before the current moment is further analyzed to indicate the degree of difficulty in filtering water quality such as possible blockage.

[0061] Preferably, in some possible implementations of the embodiments of the present invention, the method for obtaining the filtering balance degree can be found in Figure 6 , which shows a flow chart of a method for obtaining filtering balance provided by an embodiment of the present invention, the method comprising the following steps:

[0062] S101: taking the difference between the capacitance value before filtering and the capacitance value after filtering at each moment as the capacitance difference at each moment.

[0063] The filtering situation is reflected by the change of capacitance value before and after filtering at a certain moment. Here, the filtering speed brought by the filter plate at a certain moment can be reflected by the difference between the capacitance value before filtering and the capacitance value after filtering of the capacitive sensors before and after the filtering component. The capacitance difference at each moment is obtained. The greater the filtering speed, the smaller the capacitance difference.

[0064] S102: Divide the historical time period into a preset number of change periods; and obtain the change trend degree of each change period according to the continuous change degree of the capacitance difference in each change period.

[0065] In order to quantify the capacitance difference change in the historical time period more accurately and significantly, the historical time period can be further segmented for analysis, and the filtering situation in the local time period can be characterized according to the change trend of the capacitance difference in each divided time period. In an embodiment of the present invention, the historical time period can be divided into 20 change periods, and the preset number is set to 20. The specific value is not limited here. In other embodiments of the present invention, the division can also be completed based on time division, and each 1 minute is used as a change period, which will not be repeated here.

[0066] The local capacitance difference change is further analyzed for each change period. Preferably, in an embodiment of the present invention, the method for obtaining the change trend degree includes:

[0067] For any change period, in the change period, the difference between the capacitance difference at the latter moment and the capacitance difference at the previous moment in each adjacent two moments is taken as the adjacent change, reflecting the degree of change of the continuous capacitance difference in the time sequence. Further combined with all adjacent changes in the change period, the change trend degree of the change period is obtained. In the embodiment of the present invention, the average of all adjacent changes is taken as the change trend degree of the change period. The larger the change trend degree, the greater the change trend degree, indicating that the change of the capacitance difference is an incremental change.

[0068] The degree of the rising or falling trend of the capacitance difference is reflected by the change trend degree, which can be used to make impact adjustments for the subsequent overall capacitance difference analysis during the change period.

[0069] S103: Obtain the filtering balance at the current moment according to the change trend between the first change period and the last change period in time sequence and the difference in the overall capacitance difference.

[0070] By comparing and analyzing the filtering conditions in the initial time period and the filtering conditions in the final time period in the time series, we can reflect the suitability of the hole size for the water flow filtering on both sides at the current moment. The closer the filtering conditions are, the better the filtering balance is maintained at the current moment.

[0071] Preferably, in an embodiment of the present invention, the method for obtaining filtering balance includes:

[0072] First, the average value of the capacitance difference corresponding to all moments in each changing period is calculated as the average capacitance difference of each changing period. The average capacitance difference reflects the overall filtering rate in the period.

[0073] Furthermore, taking into account the changing trend of the capacitance difference in the changing period, the product of the average capacitance difference in each changing period and the changing trend degree is obtained to obtain the capacitance difference distribution index of each changing period, and the overall capacitance difference analysis is further adjusted. For the period with more complex changes, the more complex the filtering situation is, and the higher the capacitance difference distribution index is.

[0074] Finally, the difference in capacitance difference distribution index between the first change period and the last change period in time sequence is negatively correlated and normalized to obtain the filtering balance at the current moment. The initial and final local filtering conditions in the time period before the current moment are compared and analyzed. For filtering conditions with smaller changes, the degree of subsequent adjustment required is smaller, and the filtering balance is higher.

[0075] It should be noted that negative correlation mapping is a technical means well known to those skilled in the art, such as mapping in inverse proportion or negative exponential form, and is not limited here.

[0076] S2: In the historical time period, the water flow pressure characterization degree at the current moment is obtained according to the stability and continuity of the pre-filter capacitance value and the sudden increase and change of the pre-filter capacitance value.

[0077] In addition to monitoring and analyzing the filtration balance before the current moment, the water flow pressure performance from the upstream of the canal is also considered. Based on the changes in water flow pressure, the hole conditions are adjusted to ensure the normal and efficient flow of water and reduce the valve filtration pressure. By analyzing the changes in the pre-filter capacitance value, the performance of the pre-filter water flow pressure is determined. When the pre-filter capacitance value continues to show high capacitance and there is a sudden increase, it reflects that the upstream water flow pressure performance is high, and the degree of hole adjustment is greater.

[0078] Preferably, in some possible implementations of the present invention, the method for obtaining the water flow pressure representation degree is as follows: Figure 7 , which shows a flow chart of a method for obtaining a water flow pressure representation degree provided by an embodiment of the present invention, the method comprising the following steps:

[0079] S201: Obtain the stability continuity at the current moment according to the distribution disorder and distribution size of the pre-filter capacitance values ​​corresponding to all moments in the historical time period.

[0080] The performance of continuous high capacitance can reflect the pressure of the filter. The more stable the distribution of high capacitance values, the higher the degree of filtering needs to be adjusted later. Preferably, in an embodiment of the present invention, the mean of the pre-filter capacitance values ​​at all times in the historical time period is used as the pre-filter distribution index at the current moment to reflect the numerical distribution of the overall pre-filter capacitance values. The variance of the pre-filter capacitance values ​​at all times in the historical time period is used as the pre-filter chaos index at the current moment, anyway, the numerical distribution stability of the overall pre-filter capacitance values.

[0081] The product of the negatively correlated value of the pre-filter chaos index and the pre-filter distribution index is further calculated as the stability continuity at the current moment. When the pre-filter chaos index is smaller, the data distribution is more stable. When the pre-filter distribution index is larger, the numerical distribution is higher. At this time, the higher the upstream water pressure monitored through the historical time period, the greater the degree of adjustment is necessary.

[0082] S202: Obtain the change growth rate at the current moment according to the incremental change of the pre-filter capacitance value at consecutive moments in the historical time period.

[0083] Not only based on the overall distribution of the values, but also combined with the incremental situation of the capacitance value in the analysis time period, when the sudden growth degree is high, it means that the pressure on the gate filter is continuously increasing, and the necessity of adjustment is higher at this time. Preferably, in the embodiment of the present invention, in the historical time period, the ratio of the pre-filter capacitance value at the latter moment in the time sequence of each two adjacent moments to the pre-filter capacitance value at the previous moment is used as the growth ratio, and the ratio reflects the growth change of the capacitance value at consecutive moments, reflecting the incremental degree of the capacitance.

[0084] Furthermore, the average of all growth ratios in the historical time period is taken as the change growth degree at the current moment, and all enhancement degrees are combined to obtain the overall growth degree before the reflection period.

[0085] S203: Combining the stability continuity and the change growth at the current moment, obtaining the water flow pressure representation degree at the current moment.

[0086] For the water level before filtration, when it is continuously high and the growth change increases, it means that the filtration pressure at the hole position is higher and the hole adjustment degree needs to be greater. In the embodiment of the present invention, the product of the stability continuity and the change growth at the current moment is used as the water flow pressure representation degree at the current moment, and is combined in the form of a product to reflect the degree of influence of the water flow pressure.

[0087] S3: According to the current filtering balance and water flow pressure characterization, the current filtering hole adjustment coefficient is obtained; the current filtering hole adjustment coefficient and the post-filter capacitance value are transmitted to the control module for controlling the filtering component and the gate mechanism.

[0088] The filter holes are adjusted according to the filtration balance and the water flow pressure brought by the upstream of the canal. The smaller the filtration balance, the greater the degree of filtration adjustment required. The greater the water flow pressure representation, the higher the demand for hole adjustment filtration. Therefore, preferably, in an embodiment of the present invention, the product of the negatively correlated mapping value of the filtration balance at the current moment and the water flow pressure representation is normalized to obtain the adjustment degree at the current moment, reflecting the adjustment demand of the hole.

[0089] Furthermore, the sum of the adjustment degree and the preset adjustment value is used as the filter hole adjustment coefficient. The preset adjustment value is a positive number less than 1. In an embodiment of the present invention, the adjustment range is adjusted by the preset adjustment value. The preset adjustment value can be set to 0.5. The specific value can be adjusted by the implementer according to the specific implementation scenario.

[0090] The filter hole adjustment coefficient and the post-filter capacitance value at the current moment are transmitted to the control module, and the filter hole size at the current moment can be adjusted based on the filter hole adjustment coefficient. The larger the filter hole adjustment coefficient is, the larger the hole needs to be adjusted. In an embodiment of the present invention, the product of the hole size at the previous moment in time sequence and the filter hole adjustment coefficient is used as the hole size at the current moment, and adjustment can be achieved through motor control.

[0091] And when the watering channel is fully loaded, it is necessary to stop the discharge to avoid over-watering. In an embodiment of the present invention, the post-filter capacitance value is obtained in advance when the water channel is fully watered, and the post-filter capacitance value at this time is used as the preset stop-drainage threshold. If the post-filter capacitance value at the current moment is equal to the preset stop-drainage threshold, the gate mechanism controls the stop-drainage and can discharge excess water through an external pipe valve to avoid over-watering.

[0092] In summary, the present invention characterizes the water level by analyzing the difference in capacitance values ​​before and after the filter assembly, determines the filtration balance by the difference in water level changes over historical time periods, and determines the water flow pressure characterization degree reflecting the upstream in combination with the change in capacitance value before filtration, and determines the filter hole adjustment coefficient by combining the two aspects to reflect the degree of adjustment of the filter hole size at the current moment, and adjusts the filtration degree adaptively according to the filter speed change and pressure level to improve the water flow efficiency of the hole filtration. The present invention takes into account the change in filtration rate and the water flow pressure before filtration, comprehensively analyzes and adaptively regulates the filter hole size, and improves the efficiency and safety of gate filtration.

[0093] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0094] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A gate for a farmland irrigation canal, the main body of which includes a gate mechanism, a filter assembly and a filter adjustment module, characterized in that: The filtering and adjusting module includes a data acquisition module, an adjustment and analysis module and a control module; The signal output end of the data acquisition module is connected to the signal input end of the adjustment and analysis module, and the signal output end of the adjustment and analysis module is connected to the signal input end of the control module; The data acquisition module is used to respectively collect the pre-filter capacitance value and the post-filter capacitance value corresponding to the capacitive sensors before and after the filter component, and transmit the pre-filter capacitance value and the post-filter capacitance value at each moment in the historical time period to the adjustment analysis module; The adjustment analysis module is used to obtain the filtering balance at the current moment according to the stability of the changing trend of the difference between the capacitance value before filtering and the capacitance value after filtering at the moment in the historical time period; In the historical time period, the water flow pressure representation degree at the current moment is obtained according to the stability and continuity of the pre-filter capacitance value and the sudden increase and change of the pre-filter capacitance value; According to the current filtering balance and water flow pressure characterization, the current filtering hole adjustment coefficient is obtained; the current filtering hole adjustment coefficient and the post-filter capacitance value are transmitted to the control module for controlling the filtering component and the gate mechanism; The method for obtaining the water flow pressure representation degree includes: According to the distribution disorder and distribution size of the pre-filter capacitance values ​​at all times in the historical time period, the stability continuity at the current moment is obtained; According to the incremental changes of the pre-filter capacitance value at consecutive moments in the historical time period, the change growth degree at the current moment is obtained; Combining the stability continuity and change growth at the current moment, the water flow pressure representation degree at the current moment is obtained; The method of obtaining the stability continuity at the current moment according to the distribution disorder and distribution size of the pre-filter capacitance values ​​corresponding to all moments in the historical time period includes: The mean of the pre-filter capacitance values ​​at all times in the historical time period is used as the pre-filter distribution index at the current time; The variance of the pre-filter capacitance value at all moments in the historical time period is used as the pre-filter chaos index at the current moment; Calculate the product of the negative correlation mapping value of the pre-filter chaos index and the pre-filter distribution index as the stability continuity at the current moment; The step of obtaining the change growth rate at the current moment according to the incremental change of the pre-filter capacitance value at consecutive moments in the historical time period includes: In the historical time period, the ratio of the pre-filter capacitance value at the later moment to the pre-filter capacitance value at the previous moment in the time sequence of each two adjacent moments is taken as the growth ratio; The average of all growth ratios in the historical time period is taken as the change growth rate at the current moment.

2. A gate for farmland irrigation canal according to claim 1, characterized in that: The method for obtaining the filtering balance degree includes: The difference between the capacitance value before filtering and the capacitance value after filtering at each moment is taken as the capacitance difference at each moment; Divide the historical time period into a preset number of change periods; obtain the change trend of each change period according to the continuous change degree of the capacitance difference in each change period; The filtering balance at the current moment is obtained according to the change trend degree between the first change period and the last change period in time sequence and the difference in the overall capacitance difference.

3. A gate for farmland irrigation canal according to claim 2, characterized in that: The step of obtaining the change trend of each change period according to the continuous change degree of the capacitance difference in each change period includes: For any change period, in the change period, the difference between the capacitance difference at the latter moment and the capacitance difference at the previous moment in each of two adjacent moments is taken as the adjacent change; Combine all adjacent changes in the change period to obtain the change trend degree of the change period.

4. A gate for farmland irrigation canal according to claim 2, characterized in that: The method of obtaining the filtering balance at the current moment according to the change trend between the first change period and the last change period in time sequence and the difference in the overall capacitance difference includes: Calculate the average value of the capacitance difference corresponding to all moments in each change period as the average capacitance difference of each change period; The capacitance difference distribution index of each change period is obtained by multiplying the average capacitance difference of each change period by the change trend degree; The difference in the capacitance difference distribution index between the first change period and the last change period in the time sequence is negatively correlated and normalized to obtain the filtering balance at the current moment.

5. The gate for farmland irrigation canal according to claim 1, characterized in that: The method for obtaining the filter hole adjustment coefficient includes: The product of the negative correlation mapping value of the filtering balance degree at the current moment and the water flow pressure representation degree is normalized to obtain the adjustment degree at the current moment; The sum of the adjustment degree and the preset adjustment value is used as the filter hole adjustment coefficient; the preset adjustment value is a positive number less than 1.

6. The gate for farmland irrigation canal according to claim 1, characterized in that: The present filtering hole adjustment coefficient and the post-filter capacitance value are transmitted to the control module for controlling the filtering component and the gate mechanism, including: The product of the hole size at the previous moment in time series and the filter hole adjustment coefficient is used as the hole size of the filter component at the current moment; If the post-filter capacitance value at the current moment is equal to the preset stop-drain threshold, the gate mechanism controls the stop-drain.

7. The gate for farmland irrigation canal according to claim 1, characterized in that: The method of combining the stability continuity and the change growth at the current moment to obtain the water flow pressure representation at the current moment includes: The product of the stability continuity and the change growth at the current moment is used as the representation of the water flow pressure at the current moment.

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