CN-121986642-A - Be applied to intelligent fertilizer distributor's fertilization quality metering device

CN121986642ACN 121986642 ACN121986642 ACN 121986642ACN-121986642-A

Abstract

The application relates to the field of intelligent agriculture and discloses a fertilizer quality metering device applied to an intelligent fertilizer applicator, which comprises a fertilizer sucking passage, a filtering component, an impeller flowmeter and a density measuring component, wherein the fertilizer sucking passage is used for connecting a fertilizer liquid storage container with the fertilizer applicator, the filtering component is arranged on the fertilizer sucking passage and used for filtering fertilizer liquid flowing through the fertilizer sucking passage, the impeller flowmeter is arranged on the fertilizer sucking passage and used for acquiring the volume of the fertilizer liquid flowing through the fertilizer sucking passage, the density measuring component is communicated with the fertilizer sucking passage and used for collecting a fertilizer liquid sample and measuring the density of the fertilizer liquid, and the control unit is respectively and electrically connected with the impeller flowmeter and the density measuring component. Through the technical scheme, the accurate measurement of fertilization quality is realized.

Inventors

ZHANG JIAYING
YIN FEIHU
WANG ZHENHUA
LI YUNXIA
HE SHUAI
ZHENG GUOYU
GAO ZHIJIAN
DONG PENGFU

Assignees

石河子大学
新疆农垦科学院
张家口三生智慧农业科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260318

Claims (10)

1. Be applied to intelligent fertilizer distributor's fertilization quality metering device, its characterized in that includes: the fertilizer sucking passage is used for connecting the fertilizer liquid storage container with the fertilizer applicator; the filter assembly is arranged on the fertilizer sucking passage and is used for filtering the fertilizer liquid flowing through; The impeller flowmeter is arranged on the fertilizer suction passage and used for acquiring the fertilizer liquid volume flowing through the fertilizer suction passage; the density measurement assembly is communicated with the fertilizer suction passage and is used for collecting a fertilizer liquid sample and measuring the density of the fertilizer liquid; the control unit is electrically connected with the impeller flowmeter and the density measurement assembly respectively and is configured to: starting fertilizer sucking operation, measuring the volume of the flowing fertilizer liquid by using an impeller flowmeter, and recording the volume as a first volume; Acquiring the density of the fertilizer liquid measured by the density measuring assembly; Correcting the first volume based on the current measured density of the fertilizer liquid to obtain a corrected volume; And obtaining the fertilization quality in the current sampling period based on the correction volume and the currently measured fertilization density.
2. A metering device as claimed in claim 1 wherein the density measurement assembly comprises: the top of the constant volume device is provided with a drain hole; The constant volume device comprises a weighing sensor, a constant volume device, a control device and a control device, wherein the constant volume device is arranged on the weighing sensor; The liquid storage barrel is arranged below the constant volume device and is used for receiving the fertilizer liquid overflowed from the drainage hole and the fertilizer liquid discharged from the constant volume device after the measurement is completed; The liquid level measuring plate is arranged in the liquid storage barrel and is used for monitoring the liquid level state in the liquid storage barrel and the conductivity of the fertilizer liquid; the liquid inlet branch is connected with the fertilizer suction passage and the constant volume device and is used for injecting liquid into the constant volume device; a reflux branch connected with the liquid storage barrel and the fertilizer sucking passage and provided with a reflux valve; the control unit is further configured to: Controlling the opening of the liquid inlet branch to enable the fertilizer liquid to enter the fixed container; When the liquid level value in the liquid storage barrel is monitored to be increased through the liquid level measuring plate, judging that the fertilizer liquid in the fixed container overflows from the drainage hole so as to reach the preset fixed volume, triggering the weighing sensor to acquire the weight of the fertilizer liquid in the fixed container and calculating the density by combining the preset fixed volume of the fixed container; After the density calculation is completed, the fertilizer liquid in the fixed container is discharged into the liquid storage barrel, the backflow valve is controlled to be opened, and the fertilizer liquid in the liquid storage barrel is sucked back to the fertilizer suction passage by utilizing the negative pressure generated by the fertilizer applicator.
3. The metering device of claim 2, wherein the control unit is further configured to: In the process of controlling the reflux valve to be opened for sucking back, the liquid level in the liquid storage barrel is monitored through the liquid level measuring plate; When the liquid level is monitored to drop to the preset safety lower limit, the reflux valve is closed to prevent air from entering the fertilizer suction passage through the liquid storage barrel.
4. The metering device of claim 3 wherein said filter assembly is configured with a backwash system, said backwash system comprising: the drain valve is arranged at the front side of the liquid inlet end of the filter assembly and is communicated with the drain tank; A back flushing passage connected with the external pressurized water source and the rear side of the liquid outlet end of the filtering component, wherein a back flushing valve is arranged on the passage; the fertilizer sucking valve is arranged on the fertilizer sucking passage and positioned at the position of the downstream of the filter assembly; The control unit is configured to perform a backwash mode of closing the fertilizer suction valve, opening the backwash valve and the drain valve, backflushing the filter assembly with externally pressurized water and draining the sewage from the drain valve.
5. The metering device of claim 4, wherein the control unit is configured to: After the real-time density value measured by the density measurement component is obtained, retrieving a density interval in which the real-time density value is located in a database, and obtaining flow correction coefficients corresponding to reference density values at two ends of the density interval; calculating a target flow correction coefficient adapted to the current fertilizer liquid by adopting a linear interpolation algorithm based on the flow correction coefficients at the two ends of the interval; And applying the target flow correction coefficient to the first volume as a multiplier factor to obtain the corrected volume so as to eliminate volume metering errors of the impeller flowmeter caused by the change of the density of the fertilizer.
6. The metering device of claim 5, wherein the control unit is further configured to: in the continuous N density measurement periods, respectively recording the pulse signal number output by the impeller flowmeter in the process of filling liquid into the constant volume container to overflow each time, wherein N is more than or equal to 2; Accumulating the total number of N pulse signals and calculating the real-time flow coefficient K value of the impeller flowmeter based on the preset fixed volume of the constant volume device which is N times; And in the subsequent sampling period, converting an original pulse signal output by the impeller flowmeter into a first volume based on the volume conversion reference coefficient.
7. The metering device of claim 6, further comprising a temperature sensor for acquiring the temperature of the fertilizer liquid in real time; the control unit is further configured to: acquiring the temperature of the fertilizer liquid measured by the temperature sensor; performing temperature compensation on a density value obtained by calculating the weight measured by a weighing sensor and the preset fixed volume of the constant volume device based on the temperature of the fertilizer liquid to obtain the density of the fertilizer liquid after temperature compensation; the control unit is further configured to extend the backwash duration during execution of the backwash when the real-time temperature is below a preset low temperature threshold.
8. The metering device of claim 7, wherein the control unit is further configured to: before executing a flow coefficient K value calibration flow, calculating the density change rate of the fertilizer measured by the density measurement assembly in the current sampling period and the previous sampling period and the real-time temperature change rate measured by the temperature sensor, and setting the N value as a first preset number when the density change rate exceeds a preset density change rate threshold or the real-time temperature is lower than a preset low-temperature threshold; Setting an N value as a second preset number when the fluctuation absolute value of the real-time flow coefficient K value and the K value historical moving average value calculated in each period is smaller than a preset fluctuation threshold value, the density change rate is lower than the preset density change rate threshold value, and the change rate of the real-time temperature is lower than a preset temperature change rate threshold value in a continuous preset number of density measurement periods, wherein the first preset number is larger than the second preset number; Calculating a change slope based on a K value history sequence and correcting a current N value according to a comparison result of an absolute value of the change slope and a preset slope threshold, wherein when the absolute value of the change slope is larger than the first preset slope threshold, the current N value is reduced by a preset number adjustment amount to improve the execution frequency of the flow coefficient K value calibration; Wherein the corrected N value is constrained between the second preset number and the first preset number, the K value historical moving average being calculated based on K values of a preset number of historical effective calibration periods.
9. The metering device of claim 8, wherein the control unit is further configured to: When the fertilization operation is started or a fertilizer liquid replacement signal is detected, the current fertilizer liquid is matched with a preset fertilizer liquid type feature library through a preset clustering algorithm based on a fertilizer liquid density data sequence measured by a density measuring assembly, a temperature data sequence measured by a temperature sensor and a conductivity data sequence acquired by a liquid level measuring plate in a plurality of continuous sampling periods, and the current fertilizer liquid type is identified; According to the identified fertilizer liquid type, the following operations are executed: in the database searching process, limiting the searching range in a flow correction coefficient sub-library corresponding to the fertilizer liquid type so as to improve the accuracy and efficiency of density interval searching; in the temperature compensation process, invoking a temperature compensation curve sub-library matched with the fertilizer liquid type to carry out density value compensation; and configuring an initial set value of the N value as a preset reference value associated with the fertilizer liquid type.
10. The metering device of claim 9, wherein the preset clustering algorithm is a K-means clustering algorithm.

Description

Be applied to intelligent fertilizer distributor's fertilization quality metering device Technical Field The application relates to the field of agricultural fertilization, in particular to a fertilization quality metering device applied to an intelligent fertilizer applicator. Background With the development of modern agricultural technology, the water-fertilizer integrated technology is widely applied to field crops due to the advantages of water saving, fertilizer saving and labor saving. In a water and fertilizer integrated system, the intelligent fertilizer applicator usually sucks and conveys fertilizer liquid in a storage barrel to crop root systems through a fertilizer sucking channel. At present, fertilizing equipment in the market mainly adopts a flowmeter to measure the volume of fertilizer liquid, but in agricultural production material management, the purchase, inventory and cost accounting of solid fertilizer and liquid fertilizer are usually carried out by taking mass as a unit. Because the simple volume measurement with larger difference of the liquid densities of different proportions and different kinds of fertilizers cannot accurately reflect the weight of actual fertilization, the manager is difficult to accurately evaluate the total consumption amount of the fertilizers in the planting process, and the fertilizer loss and the illegal operation of workers in the fertilization process are difficult to effectively monitor. How to solve the technical problem is a technical problem that a person skilled in the art needs to overcome. Disclosure of Invention The embodiment of the application provides a fertilizing quality metering device applied to an intelligent fertilizing machine, which is used for at least partially solving the technical problems. In order to achieve the above object, the present application provides a fertilizer quality metering device applied to an intelligent fertilizer applicator, comprising: the fertilizer sucking passage is used for connecting the fertilizer liquid storage container with the fertilizer applicator; the filter assembly is arranged on the fertilizer sucking passage and is used for filtering the fertilizer liquid flowing through; The impeller flowmeter is arranged on the fertilizer suction passage and used for acquiring the fertilizer liquid volume flowing through the fertilizer suction passage; the density measurement assembly is communicated with the fertilizer suction passage and is used for collecting a fertilizer liquid sample and measuring the density of the fertilizer liquid; the control unit is electrically connected with the impeller flowmeter and the density measurement assembly respectively and is configured to: starting fertilizer sucking operation, measuring the volume of the flowing fertilizer liquid by using an impeller flowmeter, and recording the volume as a first volume; Acquiring the density of the fertilizer liquid measured by the density measuring assembly; Correcting the first volume based on the current measured density of the fertilizer liquid to obtain a corrected volume; And obtaining the fertilization quality in the current sampling period based on the correction volume and the currently measured fertilization density. According to the embodiment of the application, through the technical scheme, the fertilizer liquid quality is obtained through calculation by the density measurement assembly and the impeller flowmeter, the volume measurement value obtained through measurement by the impeller flowmeter is corrected by the obtained density value, the fertilizer liquid quality is obtained by subtracting the water quality from the fertilizer liquid quality, systematic metering deviation of the impeller flowmeter caused by fluid physical property change is eliminated, and statistics can be carried out on single fertilization quality and repeated fertilization quality. Additional features and advantages of the application will be set forth in the detailed description which follows. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic diagram of an implementation system of a fertilizer quality metering device for an intelligent fertilizer applicator provided in an exemplary embodiment of the present application; FIG. 2 is a schematic diagram of a fertilizer quality metering device of the present application applied to an intelligent fertilizer applicator; FIG. 3 is a schematic view of the structure of the density measuring assembly of the present application. Detailed Description The technical solutions in the embodiment