Fertilizer applicator mother liquor preparation system and method for mother liquor preparation using the same

Abstract

The application relates to the technical field of fertilization, and provides a fertilizer machine mother liquor preparation system and a method for preparing mother liquor by using the same. The fertilizer machine mother liquor preparation system comprises a fertilizer supply device, a mother liquor barrel, a stirring device, a magnetization device and a sensing device. The mother liquor barrel is provided with a feeding port and a water inlet, and the feeding port is communicated with the fertilizer supply device. The stirring device is arranged in the mother liquor barrel. The magnetization device comprises a controller and a magnet assembly. The magnet assembly is arranged in the mother liquor barrel, and the controller is in communication connection with the magnet assembly. The sensing device is arranged in the mother liquor barrel. According to the fertilizer machine mother liquor preparation system, the sensing device can be used for detecting the solubility of the fertilizer. The controller of the magnetization device can adjust the magnetic field strength applied by the magnet assembly to the mother liquor barrel according to the detection data of the sensing device, so that the dissolution of the fertilizer is promoted through magnetization, the solubility of the fertilizer is improved, and the fertilizer is introduced into the pipeline for drip irrigation after the solubility reaches a certain value, so that the pipeline or the sprinkler is prevented from being blocked.

Description

Technical Field

[0001] This invention relates to the field of fertilization technology, and in particular to a fertilizer applicator mother liquor preparation system and a method for preparing mother liquor using the same. Background Technology

[0002] When implementing integrated water and fertilizer management, solid fertilizers are typically mixed with water to dissolve them and prepare a mother liquor for micro-irrigation in the field. However, compared to greenhouse agriculture, open-field applications face unique and significant challenges, resulting in high failure rates, high maintenance costs, and poor farmer satisfaction with the deployed integrated water and fertilizer equipment.

[0003] Large-scale farmland typically uses canal irrigation or well irrigation, making it difficult to guarantee the quality of irrigation water. At the same time, large-scale farmland has a large amount of fertilizer applied at one time and a high dissolution load. Solid fertilizer often has the problem of insufficient dissolution in the mother liquor tank, which easily forms crystals and undissolved particles. This not only frequently clogs the filter and increases the burden of manual cleaning, but also further causes the irrigation device to clog, resulting in crop growth damage and directly affecting the implementation effect of water and fertilizer integration technology. Summary of the Invention

[0004] This invention provides a fertilizer applicator mother liquor preparation system and a method for preparing mother liquor using the same, in order to solve the problem in the prior art that insufficient fertilizer dissolution can easily occur when fertilizer and water are mixed and dissolved, leading to clogging of the irrigation device.

[0005] In a first aspect, the present invention provides a fertilizer applicator mother liquor preparation system, comprising: Fertilizer supply device, used for storing and supplying fertilizer; The mother liquor tank has a feed inlet and a water inlet. The feed inlet is connected to the fertilizer supply device and is used to receive fertilizer supplied by the fertilizer supply device. The water inlet is used to connect to an external water supply pipeline. A stirring device is installed inside the mother liquor tank; A magnetizing device includes a controller and a magnet assembly, the magnet assembly being disposed in the mother liquor tank, and the controller being communicatively connected to the magnet assembly; The sensing device is installed in the mother liquor tank and is communicatively connected to the controller; The sensing device is used to detect the solubility of fertilizer in the mother liquor tank, and the controller is used to control the magnet assembly based on the detection data fed back by the sensing device, so as to adjust the magnetic field strength applied by the magnet assembly to the inside of the mother liquor tank.

[0006] According to the fertilizer applicator mother liquor preparation system of the present invention, the magnet assembly includes: Multiple first magnets are respectively disposed on the top and bottom sides of the mother liquor tank, and the side of the first magnet facing the inner cavity of the mother liquor tank is the N pole; Multiple second magnets are arranged at intervals along the circumference of the mother liquor tank on the side wall of the mother liquor tank, and the side of the second magnet facing the inner cavity of the mother liquor tank is the S pole.

[0007] According to the fertilizer applicator mother liquor preparation system of the present invention, the first magnet and / or the second magnet is an electromagnet, and the electromagnet is electrically connected to the controller.

[0008] According to the fertilizer applicator mother liquor preparation system of the present invention, the sensing device includes: An ultrasonic sensor is disposed on the top side of the mother liquor tank and is used to emit ultrasonic pulses to the bottom side of the mother liquor tank and receive the echo. A temperature sensor is installed inside the mother liquor tank to detect the temperature inside the mother liquor tank; The controller is used to calculate the solubility of fertilizer in the mother liquor tank based on the detection data fed back by the ultrasonic sensor and the temperature sensor.

[0009] According to the fertilizer applicator mother liquor preparation system of the present invention, the ultrasonic sensor includes: A transmitting transducer is disposed on the top side of the mother liquor tank and is used to emit ultrasonic pulses vertically downward toward the bottom side of the mother liquor tank; A first receiving transducer is disposed on the top side of the mother liquor tank and is used to receive reflected echoes from the bottom area of ​​the tank. A second receiving transducer is disposed on the top side of the mother liquor tank to receive scattered and / or reflected echoes from the tank wall.

[0010] Secondly, the present invention also provides a method for preparing mother liquor using the fertilizer applicator mother liquor preparation system described in any one of the above claims, comprising: Fertilizer and water are introduced into the mother liquor tank; Stir the fertilizer and water in the mother liquor tank; A magnetic field is applied inside the mother liquor tank, and the strength of the magnetic field inside the mother liquor tank is adjusted according to the solubility of the fertilizer inside the mother liquor tank.

[0011] According to the method for preparing mother liquor using the fertilizer applicator mother liquor preparation system of the present invention, the step of adjusting the magnetic field strength according to the solubility of fertilizer in the mother liquor tank further includes: Acquire acoustic wave detection data inside the mother liquor tank using an ultrasonic sensor; Temperature data inside the mother liquor tank is obtained using a temperature sensor; The dissolution state index is calculated based on acoustic wave detection data and temperature data. Adjust the magnetic field strength inside the mother liquor tank according to the dissolution state index; The acoustic wave detection data includes at least: sound velocity, attenuation coefficient, and signal energy received by each receiving transducer; the dissolution state index can be calculated using a nonlinear function that includes acoustic wave detection data and temperature data.

[0012] According to the method for preparing mother liquor using the fertilizer applicator mother liquor preparation system of the present invention, the step of calculating the dissolution state index based on acoustic detection data and temperature data includes: Based on the sound speed normalization function, obtain the sound speed normalization factor; the sound speed normalization function is a nonlinear function relationship that includes sound speed and temperature data; Based on the attenuation normalization function, obtain the attenuation normalization factor; the attenuation normalization function is a nonlinear function relationship including the attenuation coefficient. The uniformity index is obtained based on the uniformity function; the uniformity function is a nonlinear functional relationship that includes the signal energy received by each receiving transducer. The solubility index is obtained by weighted summation of the sound speed normalization factor, the attenuation normalization factor, and the uniformity index.

[0013] According to the method for preparing mother liquor using the fertilizer applicator mother liquor preparation system of the present invention, the step of adjusting the magnetic field strength in the mother liquor tank according to the dissolution state index includes: Calculate the target magnetic field strength based on the target magnetic field function; the target magnetic field function is a nonlinear function that includes the dissolution state index and the liquid level height in the tank. Adjust the magnetic field strength inside the mother liquor tank according to the target magnetic field strength.

[0014] The method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to the present invention further includes: When the solubility index is greater than the first preset threshold and remains above the first preset threshold for a period of time exceeding the preset time, stirring is stopped, the mother liquor is drawn out, and fertilizer is applied. If the solubility index is less than the second preset threshold, start stirring the fertilizer and water in the mother liquor tank; and / or, if the uniformity index is less than the third preset threshold, start stirring the fertilizer and water in the mother liquor tank.

[0015] According to the fertilizer applicator mother liquor preparation system of the present invention, fertilizer and water are mixed in a mother liquor tank to dissolve the fertilizer in the water and form a mother liquor for drip irrigation. The mother liquor tank is equipped with a stirring device that can stir the water and fertilizer to promote fertilizer dissolution. At the same time, a magnetizing device and a sensing device are installed in the mother liquor tank. The sensing device can be used to detect the solubility of the fertilizer, and the controller of the magnetizing device can adjust the magnetic field strength applied to the mother liquor tank by the magnet component according to the detection data of the sensing device, so as to promote fertilizer dissolution through magnetization. This is beneficial to improve the solubility of fertilizer, and the fertilizer is introduced into the fertilization pipeline for drip irrigation only after the solubility reaches a certain value, preventing the pipeline or drip head from being blocked. This effectively solves the problem in the prior art that insufficient fertilizer dissolution and clogging of the irrigation device are easy to occur when mixing and dissolving fertilizer and water. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the fertilizer applicator mother liquor preparation system (excluding fertilizer supply device) provided in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the fertilizer supply device provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the magnetic field direction inside the mother liquor tank provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the arrangement of the first magnet and the second magnet provided in an embodiment of the present invention.

[0021] Figure 5 This is one of the flowcharts for preparing mother liquor using a fertilizer applicator mother liquor preparation system provided in this embodiment of the invention.

[0022] Figure 6 This is the second flowchart of the process for preparing mother liquor using a fertilizer applicator mother liquor preparation system provided in this embodiment of the invention.

[0023] Figure label: 1. Fertilizer applicator mother liquor preparation system; 11. Fertilizer supply device; 111. Fertilizer storage assembly; 112. Mobile vehicle body; 1121. Handle; 1122. Mobile base; 1123. Front support seat; 1124. Rear support seat; 1125. Motor support frame; 113. Automatic fertilizer feeding assembly; 1131. Motor; 1132. Screw rod; 1134. Front connector; 1135. Rear connector; 1136. Fertilizer delivery pipe; 1137. Fertilizer application hose; 12. Mother liquor tank; 13. Stirring device; 14. Magnetizing device; 141. Magnet assembly; 1411. First magnet; 1412. Second magnet; 15. Sensing device. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] The following is combined Figures 1-4 The present invention describes a fertilizer applicator mother liquor preparation system and a method for preparing mother liquor using the same.

[0026] like Figure 1 and Figure 2 As shown, the present invention provides a fertilizer applicator mother liquor preparation system 1, comprising: a fertilizer supply device 11, a mother liquor tank 12, a stirring device 13, a magnetizing device 14, and a sensing device 15; the fertilizer supply device 11 is used to store and supply fertilizer; the mother liquor tank 12 has a feed inlet and a water inlet, the feed inlet being connected to the fertilizer supply device 11 for receiving fertilizer supplied by the fertilizer supply device 11; the water inlet being connected to an external water supply pipeline; the stirring device 13 is disposed inside the mother liquor tank 12; the magnetizing device 14 includes a controller (not shown) and a magnet assembly 141, the magnet assembly 141 being disposed in the mother liquor tank 12, and the controller being communicatively connected to the magnet assembly 141; the sensing device 15 is disposed in the mother liquor tank 12 and is communicatively connected to the controller; the sensing device 15 is used to detect the solubility of fertilizer in the mother liquor tank 12, and the controller is used to control the magnet assembly 141 based on the detection data fed back by the sensing device 15, so as to adjust the magnetic field strength applied by the magnet assembly 141 to the inside of the mother liquor tank 12.

[0027] In this embodiment, the mother liquor tank 12 is connected to the fertilizer supply device 11 through the feed inlet and to the external water supply pipeline through the water inlet, so as to receive the solid fertilizer supplied by the fertilizer supply device 11 and the water supplied by the water supply pipeline, so that the solid fertilizer and water can be mixed together, the solid fertilizer can be dissolved in the water to form mother liquor, and the mother liquor can be used for drip irrigation fertilization.

[0028] A stirring device 13 is installed inside the mother liquor tank 12. The stirring device 13 can stir the fertilizer and water in the mother liquor tank 12 to promote the dissolution of the fertilizer.

[0029] This embodiment also includes a magnet assembly 141 and a sensing device 15 on the mother liquor tank 12. The magnet assembly 141 can be used to apply a magnetic field to the mother liquor tank 12, so that the water in the mother liquor tank 12 is magnetized to form magnetized water, thereby improving the solubility of fertilizer particles. At the same time, under the action of the magnetic field, the crystal structure of the fertilizer will become loose, thereby preventing the fertilizer particles from scaling on the inner wall of the mother liquor tank 12.

[0030] Understandably, the magnet assembly 141 can be composed of multiple magnets, at least some of which are electromagnets, so that the strength of the magnetic field can be adjusted by regulating the current passing through the magnets. In practical applications, the solubility of the fertilizer can be detected by the sensor 15, and the magnetic field strength applied by the magnet assembly 141 to the inside of the mother liquor tank 12 can be adjusted according to the fertilizer solubility. Further adjustment of the magnetic field strength can promote the solubility of the fertilizer. At the same time, users can introduce the formed mother liquor from the mother liquor tank 12 into the fertilizer application pipeline for drip irrigation only after the fertilizer solubility reaches a certain value, preventing insufficient fertilizer solubility in the mother liquor introduced into the fertilizer application pipeline from causing blockage of the pipeline or the irrigation device.

[0031] According to the fertilizer applicator mother liquor preparation system 1 of the present invention, fertilizer and water are mixed in a mother liquor tank 12 to dissolve the fertilizer in the water and form a mother liquor for drip irrigation. The mother liquor tank 12 is equipped with a stirring device 13, which can stir the water and fertilizer to promote the dissolution of the fertilizer. At the same time, a magnetizing device 14 and a sensing device 15 are provided in the mother liquor tank 12. The sensing device 15 can be used to detect the solubility of the fertilizer. The controller of the magnetizing device 14 can adjust the magnetic field strength applied to the mother liquor tank 12 by the magnet component 141 according to the detection data of the sensing device 15, so as to promote the dissolution of the fertilizer through magnetization. This is beneficial to improve the solubility of the fertilizer. After the solubility of the fertilizer reaches a certain value, it is introduced into the fertilizer pipeline for drip irrigation, preventing the pipeline or drip head from being blocked. This effectively solves the problem in the prior art that insufficient fertilizer dissolution and clogging of the irrigation device are easy to occur when mixing and dissolving fertilizer and water.

[0032] Optionally, in some embodiments, the mother liquor tank 12 is provided with a drain outlet and a discharge outlet. The drain outlet can be used to discharge residual fertilizer, mother liquor, etc. in the mother liquor tank 12 when cleaning the mother liquor tank 12; the discharge outlet is used to introduce the prepared mother liquor into the external fertilization pipeline.

[0033] In some embodiments, such as Figure 3 and Figure 4 As shown, the magnet assembly 141 includes: a plurality of first magnets 1411 and a plurality of second magnets 1412; the plurality of first magnets 1411 are respectively disposed on the top side and bottom side of the mother liquor tank 12, and the side of the first magnet 1411 facing the inner cavity of the mother liquor tank 12 is the N pole; the plurality of second magnets 1412 are arranged at intervals along the circumference of the mother liquor tank 12 on the side wall of the mother liquor tank 12, and the side of the second magnet 1412 facing the inner cavity of the mother liquor tank 12 is the S pole.

[0034] In this embodiment, first magnets 1411 are respectively provided on the top and bottom sides of the mother liquor tank 12, with the N pole of the first magnets 1411 facing the inner cavity of the mother liquor tank 12. Multiple second magnets 1412 are arranged circumferentially on the side wall of the mother liquor tank 12 at intervals, with the S pole of the second magnets 1412 facing the inner cavity of the mother liquor tank 12. This results in the direction of the magnetic field lines in the mother liquor tank 12 pointing from the N pole of the first magnets 1411 on the top or bottom side of the mother liquor tank 12 to the S pole of the second magnets 1412 on the side wall of the mother liquor tank 12. Furthermore, the magnetic field can be evenly distributed circumferentially along the mother liquor tank 12, which is beneficial for promoting the solubility of fertilizer and making the solubility distribution of fertilizer in various positions in the mother liquor tank 12 more uniform.

[0035] Optionally, in some embodiments, the first magnet 1411 and / or the second magnet 1412 are electromagnets. The electromagnets are electrically connected to the controller.

[0036] It is understood that at least a portion of the first magnet 1411 and the second magnet 1412 are electromagnets and are electrically connected to the controller so that the magnetism of the electromagnets can be adjusted by the controller, thereby adjusting the magnetic field strength inside the mother liquor tank 12.

[0037] In one specific embodiment, there are two first magnets 1411, both of which are permanent magnets. One first magnet 1411 is located at the center of the top of the mother liquor tank 12, and the other first magnet 1411 is located at the center of the bottom of the mother liquor tank 12. The first magnet 1411 is disc-shaped, and the diameter of the first magnet 1411 is one-quarter of the inner diameter of the mother liquor tank 12.

[0038] There are four second magnets 1412, all of which are electromagnets. The four second magnets 1412 are circumferentially spaced at the center of the side wall of the mother liquor tank 12 along its height direction. Each second magnet 1412 is a bar magnet extending along the height direction of the mother liquor tank 12. The angle between the line connecting two adjacent second magnets 1412 and the central axis of the mother liquor tank 12 is 90°.

[0039] In some embodiments, the sensing device 15 includes: an ultrasonic sensor and a temperature sensor; the ultrasonic sensor is disposed on the top side of the mother liquor tank 12 for emitting ultrasonic pulses to the bottom side of the mother liquor tank 12 and receiving echoes; the temperature sensor is disposed inside the mother liquor tank 12 for detecting the temperature inside the mother liquor tank 12; and the controller is used to calculate the solubility of fertilizer inside the mother liquor tank 12 based on the detection data fed back by the ultrasonic sensor and the temperature sensor.

[0040] In this embodiment, an ultrasonic sensor is installed on the top side of the mother liquor tank 12. The ultrasonic sensor can emit ultrasonic pulses to the bottom side of the mother liquor tank 12. After passing through the mixed liquid in the mother liquor tank 12, the ultrasonic pulses are reflected by the tank wall of the mother liquor tank 12 to generate echoes. The ultrasonic sensor can be used to receive the echoes and obtain corresponding detection data (such as sound speed, amplitude, echo energy, etc.). It is understood that the sound speed, amplitude and other parameters of the ultrasonic wave in the round-trip path will be affected by the dissolution state (solubility, dissolution uniformity) of the fertilizer in the mother liquor tank 12. Therefore, by performing corresponding calculations on the detection data of the ultrasonic sensor, an index that can be used to reflect the dissolution state of the fertilizer can be obtained. Based on this index, it can be determined whether the current solubility of the fertilizer in the mother liquor tank 12 has reached the target value suitable for drip irrigation fertilization. At the same time, the magnetic field strength of the magnet assembly 141 can also be controlled based on this index.

[0041] Meanwhile, it is understood that the physical parameters of ultrasound in the round-trip path are also affected by temperature. In this embodiment, a temperature sensor is installed in the mother liquor tank 12 to detect the temperature inside the mother liquor tank 12, so that the temperature data can be combined with the calculation of the index of the dissolution state of the reacting fertilizer for compensation calculation, so as to eliminate the influence of the temperature inside the mother liquor tank 12 during the calculation process and make the result more accurate.

[0042] In some embodiments, the ultrasonic sensor includes: a transmitting transducer, a first receiving transducer, and a second receiving transducer. The transmitting transducer is disposed on the top side of the mother liquor tank 12 and is used to transmit ultrasonic pulses vertically downward toward the bottom side of the mother liquor tank 12. The first receiving transducer is disposed on the top side of the mother liquor tank 12 and is used to receive reflected echoes from the bottom region of the tank. The second receiving transducer is disposed on the top side of the mother liquor tank 12 and is used to receive scattered and / or reflected echoes from the tank wall.

[0043] In this embodiment, the transmitting transducer is installed vertically downwards to emit ultrasonic pulses into the mother liquor tank 12; the first receiving transducer has a narrow beam with vertical directional orientation, mainly used to receive reflected echoes from the bottom region of the tank; the second receiving transducer has a wide beam or a specific tilt angle directional orientation, mainly used to receive scattered / reflected echoes from the tank wall and bottom edge regions. The two receiving transducers can receive echoes from different paths, so that the spatial homogeneity of the solution can be evaluated by comparing the amplitude and waveform consistency of the received signals from different spatial directional paths. Specifically, by comparing the bottom echo signal captured by the first receiving transducer with the tank wall / edge echo signal captured by the second receiving transducer, for a completely dissolved homogeneous solution, due to isotropy, the normalized signal characteristics received by the first and second receiving transducers should be highly consistent; when sediment appears at the bottom or undissolved particle clusters exist at the edge, the signals from the first and second receiving transducers will show significant differences.

[0044] In one specific embodiment, the transmitting transducer, the first receiving transducer, and the second receiving transducer are integrated in a triangular shape within the probe housing of the ultrasonic sensor. The housing of the ultrasonic sensor is made of corrosion-resistant material and is cylindrical in shape with a locking nut for easy integration into the top of the mother liquor tank 12. The interior of the housing is isolated by sound-absorbing material and structure to reduce direct acoustic crosstalk between the three transducers.

[0045] Alternatively, in some embodiments, such as Figure 2 As shown, the fertilizer supply device 11 includes a fertilizer storage component 111, a mobile vehicle body 112, and an automatic fertilizer feeding component 113. The fertilizer storage component 111 consists of a fertilizer storage box and a fertilizer feeding channel. The fertilizer storage box is formed by connecting a square open structure and a funnel structure distributed vertically. The bottom of the funnel structure is connected to the automatic fertilizer feeding component 113 through the fertilizer feeding channel. The top of the fertilizer storage box is sealed to prevent rainwater and other substances from entering and contaminating the fertilizer.

[0046] The mobile vehicle body 112 consists of a handle 1121, a mobile base 1122, a front support 1123, a rear support 1124, and a motor support frame 1125. The mobile base 1122 is equipped with wheels at its bottom, and brakes are mounted on the wheels, allowing the mobile base 1122 to move. The handle 1121, front support 1123, rear support 1124, and motor support frame 1125 are respectively located on the upper side of the mobile base 1122.

[0047] The automatic fertilizer feeding assembly 113 consists of a motor 1131, a screw rod 1132, a front connector 1134, a rear connector 1135, a fertilizer delivery pipe 1136, and a fertilizer addition hose 1137. The motor 1131 is mounted on a motor support frame 1125. The inlet of the fertilizer delivery pipe 1136 is connected to the fertilizer addition channel to receive fertilizer input from the fertilizer addition channel. The outlet of the fertilizer delivery pipe 1136 is connected to the inlet of the mother liquor tank 12 through the fertilizer addition hose 1137. The screw rod 1132 is located inside the fertilizer delivery pipe 1136 and is connected to the motor 1131 for transmission, so that the fertilizer is transported to the outlet of the fertilizer delivery pipe 1136 under the drive of the motor 1131.

[0048] The front connector 1134 and the front support 1123 are rotatably connected, and the rear connector 1135 and the rear support 1124 are rotatably connected. The rear support 1124 can extend and retract in the vertical direction to adjust the height of the fertilizer delivery pipe 1136 (mainly the outlet of the fertilizer delivery pipe 1136).

[0049] Optionally, in some embodiments, the stirring device 13 includes a stirring motor, a stirring shaft, and a stirring paddle. The stirring shaft is located on the central axis inside the mother liquor tank 12. The stirring motor and the stirring shaft are connected by a drive. The stirring paddle is located on the stirring shaft. The number of stirring paddles is 3-4, and the diameter of the paddle blades is two-thirds of the inner diameter of the mother liquor tank 12, ensuring that the stirring range covers the entire cross-section of the tank and achieves full stirring and mixing of the mother liquor.

[0050] On the other hand, the present invention also provides a method for preparing mother liquor using the fertilizer applicator mother liquor preparation system 1 provided in any of the above embodiments. It is understood that the mother liquor preparation method of the present invention, by employing the fertilizer applicator mother liquor preparation system 1 provided in the above embodiments, also possesses the advantages of the fertilizer applicator mother liquor preparation system 1, which will not be elaborated further here. Furthermore, as... Figure 5 As shown, the method for preparing mother liquor using the fertilizer applicator mother liquor preparation system 1 includes the following steps: Step S101: Pour fertilizer and water into the mother liquor tank.

[0051] Step S102: Stir the fertilizer and water in the mother liquor tank.

[0052] Step S103: Apply a magnetic field to the mother liquor tank and adjust the magnetic field strength in the mother liquor tank according to the solubility of the fertilizer in the mother liquor tank.

[0053] During the preparation of the mother liquor, a certain amount of fertilizer and water can be first introduced into the mother liquor tank 12 through the fertilizer supply device 11 and external pipeline, respectively, so that the fertilizer and water can be mixed in the mother liquor tank 12. Then, the stirring device 13 in the mother liquor tank 12 is activated to stir the fertilizer and water in the mother liquor tank 12 to promote the dissolution of fertilizer. At the same time as stirring, the magnetic device 14 is controlled to apply a magnetic field to the mother liquor tank 12 to promote the dissolution of fertilizer in the mother liquor tank 12 through magnetization. At the same time, during the stirring and dissolution process, the solubility of fertilizer in the mother liquor tank 12 can be detected by the sensor device 15, so that the strength of the magnetic field applied by the magnetic device 14 to the mother liquor tank 12 can be adjusted according to the solubility of fertilizer to further promote the dissolution of fertilizer, so that the solubility of fertilizer in the mother liquor can meet the fertilization requirements and avoid clogging of fertilizer pipelines or drip irrigation heads due to insufficient fertilizer solubility in the mother liquor.

[0054] In some embodiments, such as Figure 6 As shown, the steps for adjusting the magnetic field strength according to the solubility of the fertilizer in the mother liquor tank also include: Step S1031: Acquire acoustic wave detection data inside the mother liquor tank using an ultrasonic sensor.

[0055] Step S1032: Obtain temperature data inside the mother liquor tank using a temperature sensor.

[0056] Step S1033: Calculate the dissolution state index based on the acoustic detection data and temperature data.

[0057] Step S1034: Adjust the magnetic field strength inside the mother liquor tank according to the dissolution state index.

[0058] The acoustic wave detection data includes at least: sound velocity, attenuation coefficient, and signal energy received by each receiving transducer; the dissolution state index can be calculated using a nonlinear function that includes acoustic wave detection data and temperature data.

[0059] During the preparation of the mother liquor, an ultrasonic sensor can emit ultrasonic pulses to the bottom of the mother liquor tank 12. After passing through the mixed liquid in the mother liquor tank 12, the ultrasonic pulses are reflected by the tank wall and generate echoes. The ultrasonic sensor can be used to receive the echoes and obtain corresponding detection data (such as sound velocity, amplitude, echo energy, etc.). It is understood that the sound velocity, amplitude and other parameters of the ultrasonic wave in the round-trip path will be affected by the dissolution state (solubility, dissolution uniformity) of the fertilizer in the mother liquor tank 12. Therefore, by performing corresponding calculations on the detection data of the ultrasonic sensor, an index that can be used to reflect the dissolution state of the fertilizer can be obtained. Based on this index, it can be determined whether the current solubility of the fertilizer in the mother liquor tank 12 has reached the target value suitable for drip irrigation fertilization. At the same time, the magnetic field strength of the magnet component 141 can also be controlled based on this index.

[0060] Meanwhile, it is understood that the physical parameters of ultrasound in the round-trip path are also affected by temperature. In this embodiment, a temperature sensor is installed in the mother liquor tank 12 to detect the temperature inside the mother liquor tank 12, so that the temperature data can be combined with the calculation of the index of the dissolution state of the reacting fertilizer for compensation calculation, so as to eliminate the influence of the temperature inside the mother liquor tank 12 during the calculation process and make the result more accurate.

[0061] In some embodiments, the step of calculating the dissolution state index based on acoustic detection data and temperature data includes: The sound speed normalization factor is obtained based on the sound speed normalization function; the sound speed normalization function is a nonlinear function relationship that includes sound speed and temperature data.

[0062] The attenuation normalization factor is obtained based on the attenuation normalization function; the attenuation normalization function is a nonlinear function relationship that includes the attenuation coefficient.

[0063] The uniformity index is obtained based on the uniformity function; the uniformity function is a nonlinear function relating the signal energy received by each receiving transducer.

[0064] The solubility index is obtained by weighted summation of the sound speed normalization factor, the attenuation normalization factor, and the uniformity index.

[0065] In this embodiment, the time of flight (TOF) of the ultrasonic pulse can be obtained using an ultrasonic sensor, and the sound path distance L (m) is precisely known, from which the sound speed v (m / s) can be calculated. .

[0066] After obtaining the speed of sound, the normalization factor can be calculated using the speed of sound normalization function. It can be understood that the speed of sound normalization function can be used to obtain the normalization factor through multiple calculation steps, as follows: The speed of sound at a standard 25°C temperature is obtained by compensating using the temperature sensor reading T (°C). (m / s).

[0067] The sound path distance L can be obtained through initial calibration. The specific steps are as follows: when the mother liquor tank 12 is filled with pure water, an ultrasonic wave is emitted once using an ultrasonic sensor, and the time of flight (TOF) of the ultrasonic wave is measured. At this time, because the medium is pure water, the speed of sound in the water is... The m / s value is known (and can be obtained by looking up a table using temperature compensation), from which the precise sound path distance can be deduced: .

[0068] To obtain the current state The normalization factor for the speed of sound can then be calculated. The calculation formula is as follows: ; In the formula, (m / s) is the theoretical velocity of sound in the mother liquor at a known concentration C (mol / L) and temperature T (°C), which can be obtained based on empirical formulas or prior databases.

[0069] In practical applications, users need to pre-input the type of fertilizer and the target concentration (i.e., the corresponding concentration C) into the system. When calculating the sound velocity normalization factor, the system retrieves the corresponding theoretical sound velocity from the database based on the temperature sensor reading T and the set concentration C. .

[0070] As a tolerance factor, the closer the measured sound speed is to the theoretical value, the closer the sound speed normalization factor is to 1. The tolerance coefficient is a key parameter that determines the sensitivity of the sound speed normalization factor. Essentially, it is an "allowable deviation window" that determines how much the measured sound speed deviates from the theoretical value before it begins to decrease significantly. It is generally measured experimentally, but in practical applications, it can be automatically assigned a value based on the fertilizer type and the recommended table built into the controller.

[0071] Specifically, The value can be selected according to the fertilizer type, and the specific selection method is shown in the table below: Table 1 Tolerance Recommendation Table Fertilizer type Feature Description Recommended δ range Typical value High precision / easily soluble Urea, potassium nitrate, single-element fertilizer 0.3% ~ 0.8% 0.5% Medium-precision / conventional water-soluble fertilizer Water-soluble fertilizers containing macronutrients and compound fertilizers 0.8% ~ 1.5% 1.0% Low precision / complex components Fertilizers and liquid fertilizers containing many impurities 1.5% ~ 3.0% 2.0% The sound speed normalization factor can be calculated by following the steps above.

[0072] Additionally, the attenuation normalization factor can be calculated based on the attenuation normalization function using the amplitude A of the received signal from the ultrasonic sensor. Specifically, it can be based on the received signal amplitude A of the ultrasonic sensor and the signal amplitude of the ultrasonic signal in pure water. And the calculation of attenuation coefficient for sound path L (dB / cm), the calculation formula is as follows: Next, the frequency of the received signal from the ultrasonic sensor can be combined. (Hz), calculate the attenuation normalization factor The calculation formula is as follows: ; In the formula, For frequency The ultrasonic signal is absorbed and attenuated in pure water at the same temperature.

[0073] It is understandable that the sound velocity normalization factor and the attenuation normalization factor mainly reflect the dissolution state of fertilizer in the mother liquor.

[0074] Next, based on the echo signal energy received by the first and second receiving transducers arranged on the top of the mother liquor tank 12 in this embodiment from different paths (reflection from the bottom of the tank and reflection from the tank wall or the edge of the bottom of the tank), the uniformity index can be calculated.

[0075] The specific calculation results are as follows: First, calculate the signal energy received by the first receiving transducer. The signal energy received by the second receiving transducer Standard deviation Understandably, and The dimensionless value is usually used after converting the voltage signal value output by the receiving transducer.

[0076] Next, the formula for calculating the uniformity index U is as follows: ; In the formula, k is a proportionality constant, which can be obtained through experiments and calibration based on the fertilizer type and the size and structure of the mother liquor tank 12. For example, for large-scale farmland tanks and urea fertilizers, k=4.

[0077] Understandably, the uniformity index U reflects the consistency of the solution state between the bottom and wall areas of the container. The closer U is to 1, the more consistent the solution state between the bottom and wall areas, i.e., the better the uniformity.

[0078] The normalization factor for the speed of sound was obtained through calculation. Attenuation normalization factor After obtaining the uniformity index U, the three can be reasonably weighted and summed to obtain the dissolution state index S. The specific calculation formula is as follows: ; In the formula, , , These are the weighting coefficients. , , satisfy: The weighting coefficients can be determined through experimental calibration or machine learning optimization.

[0079] Understandably, with appropriate weighting, the solubility index S reflects both the solubility of the fertilizer in the mother liquor and the uniformity of the mother liquor across different regions. Therefore, in practical applications, the solubility index S can serve as a basis for adjusting the magnetic field strength and for determining whether the current solubility state of the mother liquor meets production requirements, ensuring that the final mother liquor suitable for drip irrigation can simultaneously achieve both solubility and uniformity.

[0080] In some embodiments, , , It can be calibrated, and the specific steps are as follows: First, prepare standard samples: Prepare a series of samples representing different dissolution states, covering the full range from "completely insoluble" to "completely dissolved," and adjust the solution temperature to the baseline temperature of 25°C. Based on dissolution experience, set a target S value for each state, ranging from 0 to 1. For example, the samples include S1-5. The specific dissolution states and corresponding S values ​​are shown in the table below: Sample number Description of dissolved state Corresponding real-world scenarios Target S value S1 Pure water (completely dissolved and homogeneous) Baseline state 1.0 S2 Completely dissolved dilute solution Just mix well 0.95 S3 Slight turbidity / small amount of undissolved particles Insufficient mixing 0.7 S4 Obvious sedimentation / layering After stopping stirring 0.4 S5 A large amount of undissolved particles accumulated Extremely uneven 0.1 ~ 0.2 Next, parameter data for each sample were collected, and the sound speed normalization factor for each sample was calculated. Attenuation normalization factor And the uniformity index U.

[0081] Using the parameter data corresponding to each sample as input features and the target S-value as output, multiple linear regression is performed to fit the coefficients. , , Generally speaking, , , The weighting factor is mainly determined by the type of fertilizer. For example, the weighting factor for urea fertilizer is: W=[0.2, 0.5, 0.3].

[0082] In some embodiments, the step of adjusting the magnetic field strength inside the mother liquor tank according to the dissolution state index includes: The target magnetic field strength is calculated based on the target magnetic field function; the target magnetic field function is a nonlinear function that includes the dissolution state index and the liquid level height in the tank.

[0083] Adjust the magnetic field strength inside the mother liquor tank according to the target magnetic field strength.

[0084] In this embodiment, after obtaining the dissolution state index S, the target magnetic field strength B(T) can be calculated according to the following formula: In the formula, (T) is the basic magnetic field strength, usually provided by a permanent magnet, which can be calibrated experimentally. a and b are adjustable weighting coefficients, which reflect the degree of dissolution and the liquid level height on the magnetic field strength, respectively, and are determined through field trials. H (m) is the liquid level height in mother liquor tank 12. (m) represents the maximum designed liquid level height of the mother liquor tank 12. The algorithm enables an adaptive adjustment mechanism: when the degree of dissolution S is low, the system automatically increases the magnetic field strength B to enhance the fluid shear force generated by the stirring component and the activation effect of the magnetic field on the fertilizer particles, thereby accelerating the dissolution process; when the liquid level height H increases, the controller correspondingly increases the magnetic field strength to compensate for the magnetic field attenuation caused by the rise in liquid level, ensuring that the magnetic field distribution in all areas of the tank from top to bottom is uniform and avoiding localized insufficient dissolution.

[0085] The liquid level in the mother liquor tank 12 can be detected by the liquid level gauge inside the mother liquor tank 12, or it can be obtained directly based on the detection data of the ultrasonic sensor.

[0086] In some embodiments, the method for preparing mother liquor using the fertilizer applicator mother liquor preparation system 1 further includes the following steps: When the solubility index is greater than the first preset threshold and remains above the first preset threshold for more than a preset time, stirring is stopped, the mother liquor is drawn out, and fertilizer is applied.

[0087] If the solubility index is less than the second preset threshold, start stirring the fertilizer and water in the mother liquor tank; and / or, if the uniformity index is less than the third preset threshold, start stirring the fertilizer and water in the mother liquor tank.

[0088] In this embodiment, the solubility index S calculated in the aforementioned steps can be used as a criterion for determining whether the mother liquor meets the fertilization requirements. Specifically, the solubility index corresponding to the mother liquor whose solubility meets the fertilization requirements can be determined based on experimental and empirical data and used as a first preset threshold. When the solubility index S of the mother liquor undergoing stirring exceeds and remains above the first preset threshold for a certain period of time (exceeding the preset time, such as one minute), the controller determines that the solubility and uniformity of the current mother liquor meet the fertilization requirements, so that the mother liquor can be drawn out and used for fertilization. At the same time, once the mother liquor meets the standards, stirring of the mother liquor can be stopped.

[0089] Meanwhile, it is understandable that sedimentation may occur in the mother liquor if it is not stirred for a long time. During the process of drawing out the mother liquor and applying it as fertilizer, the detection data of the sensor device 15 can be continuously monitored, and the solubility index and uniformity index can be calculated in real time. If either of these indices falls below a preset threshold (the solubility index is below the second preset threshold or the uniformity index is below the third preset threshold), the stirring device 13 is activated to prevent substandard mother liquor from flowing into the fertilizer application pipeline. It is also understandable that if the solubility index is below the second preset threshold or the uniformity index is below the third preset threshold, the fertilizer application machine mother liquor preparation system 1 can also issue an alarm via an alarm device.

[0090] Understandably, the second and third preset thresholds can also be set based on experimental and empirical data.

[0091] In one specific embodiment, the fertilizer applicator stock solution preparation system 1 is used to prepare stock solutions for a large-scale corn planting base. The base has a drip irrigation network with a main pipeline diameter of 90 mm. The steps for preparing a batch of water-soluble compound fertilizer stock solutions for seedling topdressing in its 500-mu irrigation area are as follows: (1) System in place: Connect fertilizer supply device 11 and mother liquor tank 12.

[0092] (2) Material preparation: Add sufficient granular water-soluble compound fertilizer to fertilizer supply device 11, and then seal the box cover. Close the drain valve of mother liquor tank 12, and connect the discharge port of mother liquor tank 12 to the Venturi fertilizer suction device or fertilizer injection pump on the main pipeline of the drip irrigation system through the fertilizer suction pipe.

[0093] (3) Water and electricity connection: Connect the system to a 380V three-phase industrial power supply and a 220V single-phase power supply. Connect the water source to the inlet of mother liquor tank 12 through a solenoid valve.

[0094] (4) Sensor calibration and database establishment Step 1: Preparation of commonly used field fertilizers (K) + Ca 2+ NO3 - H2PO4 - Standard solutions of different concentrations (C) and at different temperatures (T) in a completely dissolved state.

[0095] Step 2: Use this sensor to measure the velocity of sound in these standard solutions. v A "completely dissolved acoustic parameter database" was established, and theoretical formulas were fitted. .

[0096] Step 3: Calibrate the attenuation coefficient in a suspension with known particle size. The relationship with particle concentration and particle size is used to help determine the function. In the form of.

[0097] (5) Determination of weighting coefficients and threshold calibration Step 1: Design a dissolution experiment and collect data throughout the process, from adding the ingredients to complete dissolution.

[0098] Step 2: Determine the weights using principal component analysis or optimization methods based on expert experience. , , The velocity of sound changes greatly during the initial stage of dissolution. The weighting can be slightly higher; the final stage of dissolution is sensitive to trace particles. The weight can be slightly higher.

[0099] Step 3: Using the time to complete dissolution determined by methods such as visual observation, centrifugation, filtration, and weighing as a benchmark, deduce the stable judgment threshold under multiple sets of experiments. .

[0100] 2. Specific Implementation Steps Step 1: Parameter Settings and System Startup (1) Select compound water-soluble fertilizer as the fertilizer type on the human-computer interaction touch screen of the system. The system interface will automatically pop up a prompt: "Recommended mother liquor concentration range for this fertilizer: 5%-30%". Set the target mother liquor concentration to 20%, set the single preparation volume to 1000L, and set the diameter D of the mother liquor tank 12 and the maximum allowable height of the liquid. Set the dissolution threshold to 95% and click the "Start Preparation" button.

[0101] (2) After receiving the instruction, the entire system performs the following calculations and actions: ① Calculate the mass of a single batch of liquid fertilizer: 1000 L × 20% = 200 kg; ② Send a start command to the motor of the mobile fertilizer unit, and calculate the running time required for 50kg of fertilizer based on the screw pitch and rotation speed; ③ Calculate the corresponding height based on the diameter D and volume 500L of the mother liquor tank 12. .

[0102] Step 2: Quantitative fertilization by fertilizer supply device 11 (1) The fertilizer supply device 11 starts after receiving the instruction: (2) When the controller determines that the amount of fertilizer applied reaches 200kg, the fertilizer supply device 11 is turned off and the fertilizer application process ends.

[0103] Step 3: Water injection, initial mixing and magnetic field activation (1) The controller opens the clean water solenoid valve to inject water into the mother liquor tank 12.

[0104] (2) An ultrasonic sensor on the top of the tank monitors the liquid level height H in real time. When the liquid level reaches... The controller shuts off the clean water solenoid valve.

[0105] (3) Start the stirring assembly to initially mix the water and fertilizer in the bucket. At the same time, the four sets of long strip electromagnets on the side walls start working according to the initial parameters.

[0106] Step 4: Intelligent Sensing and Dynamic Adjustment of Magnetic Field (1) Data acquisition: The ultrasonic sensor works continuously, not only measuring the liquid level H, but also calculating the concentration of suspended solid particles in the tank in real time by analyzing the characteristics of the returned sound waves, and quantifying it as the solubility index S (0~1).

[0107] (2) Intelligent calculation: The algorithm program built into the controller dynamically calculates the required target magnetic field strength B based on the following magnetic field strength control function: In this example, the parameters optimized through field trials are assumed to be: B0 = 5 mT, a = 0.5, b = 0.2, H max =1.5 m.

[0108] (3) Dynamic adjustment: The controller compares the calculated B value with the actual output magnetic field of the current electromagnet, and adjusts the current output to the four sets of side wall electromagnets through the PID algorithm, thereby accurately controlling the intensity of the additional magnetic field generated, so that the combined magnetic field in the central area of ​​the barrel is stabilized at the target value B.

[0109] Step 5: Mother liquor preparation completed and output (1) When the ultrasonic sensor detects that the solubility index S remains stable above 0.95 for more than 1 minute, the intelligent control unit determines that the mother liquor has been uniformly prepared.

[0110] (2) The controller first turns off the stirring motor to stop mechanical stirring.

[0111] (3) Adjust and maintain the magnetic field strength of the electromagnet at a low and stable value to maintain the magnetization state of the mother liquor.

[0112] (4) Display the “Mother liquor ready” status on the touch screen and automatically turn on the “Fertilizer absorption allowed” flag.

[0113] Through the full implementation of the above embodiments, the following technical effects were achieved: (1) Fully automated: From parameter setting to mother liquor output, no manual intervention is required for fertilizer application, stirring and monitoring, reducing the number of manual fertilizer preparation processes by 8.

[0114] (2) Intelligent and precise adjustment: Based on real-time feedback of solubility and liquid level, the magnetic field strength is dynamically optimized to ensure that extremely high solubility is achieved and maintained in the shortest time.

[0115] (3) High compatibility and reliability: The mobile fertilizer unit is adaptable to different sites and tank heights; the magnetic mother liquor tank has a reasonable structural design and is easy to maintain.

[0116] (4) The final output of magnetized, highly uniform mother liquor effectively reduces the risk of blockage in the drip irrigation system. At the same time, the magnetization effect can theoretically improve the migration of fertilizer in the soil and the absorption efficiency of crops, thus achieving a significant improvement in water and fertilizer utilization efficiency.

[0117] (5) The built-in fertilizer database and input verification logic of the system prevent unscientific and high-risk high concentration settings due to insufficient knowledge or mistakes of operators, and fundamentally avoid the core risks of dissolution failure, equipment overload and drip irrigation blockage.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fertilizer applicator mother liquor preparation system, characterized in that, include: Fertilizer supply device, used for storing and supplying fertilizer; The mother liquor tank has a feed inlet and a water inlet. The feed inlet is connected to the fertilizer supply device and is used to receive fertilizer supplied by the fertilizer supply device. The water inlet is used to connect to an external water supply pipeline. A stirring device is installed inside the mother liquor tank; A magnetizing device includes a controller and a magnet assembly, the magnet assembly being disposed in the mother liquor tank, and the controller being communicatively connected to the magnet assembly; The sensing device is installed in the mother liquor tank and is communicatively connected to the controller; The sensing device is used to detect the solubility of fertilizer in the mother liquor tank, and the controller is used to control the magnet assembly based on the detection data fed back by the sensing device, so as to adjust the magnetic field strength applied by the magnet assembly to the inside of the mother liquor tank.

2. The fertilizer applicator mother liquor preparation system according to claim 1, characterized in that, The magnet assembly includes: Multiple first magnets are respectively disposed on the top and bottom sides of the mother liquor tank, and the side of the first magnet facing the inner cavity of the mother liquor tank is the N pole; Multiple second magnets are arranged at intervals along the circumference of the mother liquor tank on the side wall of the mother liquor tank, and the side of the second magnet facing the inner cavity of the mother liquor tank is the S pole.

3. The fertilizer applicator mother liquor preparation system according to claim 2, characterized in that, The first magnet and / or the second magnet is an electromagnet, and the electromagnet is electrically connected to the controller.

4. The fertilizer applicator mother liquor preparation system according to claim 1, characterized in that, The sensing device includes: An ultrasonic sensor is disposed on the top side of the mother liquor tank and is used to emit ultrasonic pulses to the bottom side of the mother liquor tank and receive the echo. A temperature sensor is installed inside the mother liquor tank to detect the temperature inside the mother liquor tank; The controller is used to calculate the solubility of fertilizer in the mother liquor tank based on the detection data fed back by the ultrasonic sensor and the temperature sensor.

5. The fertilizer applicator mother liquor preparation system according to claim 4, characterized in that, The ultrasonic sensor includes: A transmitting transducer is disposed on the top side of the mother liquor tank and is used to emit ultrasonic pulses vertically downward toward the bottom side of the mother liquor tank; A first receiving transducer is disposed on the top side of the mother liquor tank and is used to receive reflected echoes from the bottom area of ​​the tank. A second receiving transducer is disposed on the top side of the mother liquor tank to receive scattered and / or reflected echoes from the tank wall.

6. A method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to any one of claims 1-5, characterized in that, include: Fertilizer and water are introduced into the mother liquor tank; Stir the fertilizer and water in the mother liquor tank; A magnetic field is applied inside the mother liquor tank, and the strength of the magnetic field inside the mother liquor tank is adjusted according to the solubility of the fertilizer inside the mother liquor tank.

7. The method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to claim 6, characterized in that, The step of adjusting the magnetic field strength according to the solubility of the fertilizer in the mother liquor tank further includes: Acquire acoustic wave detection data inside the mother liquor tank using an ultrasonic sensor; Temperature data inside the mother liquor tank is obtained using a temperature sensor; The dissolution state index is calculated based on acoustic wave detection data and temperature data. Adjust the magnetic field strength inside the mother liquor tank according to the dissolution state index; The acoustic wave detection data includes at least: sound velocity, attenuation coefficient, and signal energy received by each receiving transducer; the dissolution state index can be calculated using a nonlinear function that includes acoustic wave detection data and temperature data.

8. The method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to claim 7, characterized in that, The step of calculating the dissolution state index based on acoustic detection data and temperature data includes: Based on the sound speed normalization function, obtain the sound speed normalization factor; the sound speed normalization function is a nonlinear function relationship that includes sound speed and temperature data; Based on the attenuation normalization function, obtain the attenuation normalization factor; the attenuation normalization function is a nonlinear function relationship including the attenuation coefficient. The uniformity index is obtained based on the uniformity function; the uniformity function is a nonlinear functional relationship that includes the signal energy received by each receiving transducer. The solubility index is obtained by weighted summation of the sound speed normalization factor, the attenuation normalization factor, and the uniformity index.

9. The method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to claim 7, characterized in that, The adjustment of the magnetic field strength inside the mother liquor tank based on the dissolution state index includes: Calculate the target magnetic field strength based on the target magnetic field function; the target magnetic field function is a nonlinear function that includes the dissolution state index and the liquid level height in the tank. Adjust the magnetic field strength inside the mother liquor tank according to the target magnetic field strength.

10. The method for preparing mother liquor using the fertilizer applicator mother liquor preparation system according to claim 8, characterized in that, Also includes: When the solubility index is greater than the first preset threshold and remains above the first preset threshold for a period of time exceeding the preset time, stirring is stopped, the mother liquor is drawn out, and fertilizer is applied. If the solubility index is less than the second preset threshold, start stirring the fertilizer and water in the mother liquor tank; And / or, if the uniformity index is less than the third preset threshold, start stirring the fertilizer and water in the mother liquor tank.

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