System and method for automatically preparing nutrient solution for nursery stock lossy operation

Abstract

The invention relates to an automatic nutrient solution preparation system and method for nursery stock lossy operation, the system comprises a mother liquor A preparation unit, a mother liquor B preparation unit and a mother liquor C preparation unit, the mother liquor preparation units are respectively provided with a blanking valve, the blanking valves are respectively connected with a weighing instrument, and the weighing instrument is connected with a three-way valve; the three-way valve is respectively connected with a mother liquor A storage tank, a mother liquor B storage tank and a mother liquor C storage tank, and the mother liquor storage tanks are respectively provided with a liquid level meter and are respectively connected with a water feeding pump through an extensive valve and a fine valve; the automatic preparation system further comprises a control assembly, the control assembly comprises an upper computer with a touch screen and a lower computer with a touch screen, and the lower computer is electrically connected with the spiral feeders, the discharging valves, the extensive valves, the fine valves, the liquid level meters, the three-way valves, the weighing instruments and the water feeding pumps of the mother liquor preparation units respectively. According to the automatic preparation system, calculation, ingredient preparation and dump of each link in the nutrient solution preparation process can be automatically completed according to the preparation requirements of a user, and the influence caused by adverse factors of manual operation is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of nursery stock nutrient solution preparation, and particularly relates to an automatic nutrient solution preparation system for nursery stock with damaged operations. Background Art

[0002] In order to enable nursery stock to promote wound healing, improve survival rate, and ensure healthy growth after damaged operations such as grafting and transplanting, it is often necessary to apply a nutrient solution to the operation wound to provide substances such as nutrients, hormones, and growth regulators required by the nursery stock, help the nursery stock better adapt to the damaged operation process, reduce the risk of infection, and promote cell division and growth. The preparation of such nutrient solutions needs to be carried out according to scientific and standardized preparation processes and precise mixing ratios of relevant synthetic raw materials.

[0003] The general process for preparing nutrient solutions for nursery stock with damaged operations is as follows: (1) Using basic raw materials such as calcium nitrate tetrahydrate, ammonium dihydrogen phosphate, and pure water to prepare corresponding mother liquors according to established ratios; (2) Finally, preparing a working solution based on the mixing ratios of different mother liquors, and its preparation flow chart is as Figure 1 shown. In the whole preparation process, not only tools such as electronic scales, various containers, and pipettes are needed for implementation, but also relying solely on manual preparation requires completing a series of cumbersome procedures such as sampling of preparation raw materials, calculation of preparation ratios, maintenance of preparation tools, measurement and recording of various intermediate process parameters, etc. Not only is the workload huge, but it is also extremely easy to have misoperations, resulting in a large amount of waste. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic nutrient solution preparation system for nursery stock with damaged operations, which can automatically complete tasks such as calculation, ingredient modulation, and transfer and storage in each link of the nutrient solution preparation process according to the user's preparation requirements, and effectively reduce the influence brought by various adverse factors of manual operations.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: An automatic nutrient solution preparation system for damaged nursery stock operations includes a mother liquor A preparation unit, a mother liquor B preparation unit, and a mother liquor C preparation unit. The mother liquor A preparation unit includes a No. 1 screw feeder, a calcium nitrate tetrahydrate storage tank, and a No. 1 blanking valve connected in sequence. The mother liquor B preparation unit includes a No. 2 screw feeder, a calcium dihydrogen phosphate storage tank, and a No. 2 blanking valve connected in sequence. The mother liquor C preparation unit includes a No. 3 screw feeder, a ferrous sulfate heptahydrate storage tank, and a No. 3 blanking valve connected in sequence. The mother liquor C preparation unit also includes a No. 4 screw feeder, a disodium ethylenediaminetetraacetate storage tank, and a No. 4 blanking valve connected in sequence. The No. 1 blanking valve, No. 2 blanking valve, No. 3 blanking valve, and No. 4 blanking valve are respectively connected to a weighing instrument, and the weighing instrument is connected to a three-way valve. The three-way valve is respectively connected to a mother liquor A storage tank, a mother liquor B storage tank, and a mother liquor C storage tank. The mother liquor A storage tank is also respectively connected to a water supply pump through a No. 1 rough discharge valve and a No. 1 fine discharge valve. The mother liquor B storage tank is also respectively connected to a water supply pump through a No. 2 rough discharge valve and a No. 2 fine discharge valve. The mother liquor C storage tank is also respectively connected to a water supply pump through a No. 3 rough discharge valve and a No. 3 fine discharge valve. The mother liquor A storage tank, the mother liquor B storage tank, and the mother liquor C storage tank are respectively connected to a working fluid storage tank through a discharge valve. The mother liquor A storage tank, the mother liquor B storage tank, and the mother liquor C storage tank are respectively provided with liquid level gauges, namely a No. 1 liquid level gauge, a No. 2 liquid level gauge, and a No. 3 liquid level gauge; The automatic preparation system further includes a control component, and the control component includes a host computer with a touch screen. The host computer is electrically connected to a slave computer, and the slave computer is respectively electrically connected to each of the above-mentioned screw feeders, blanking valves, rough discharge valves, fine discharge valves, liquid level gauges, three-way valve, weighing instrument, and water supply pump.

[0006] Among them, mother liquor A is generated by mixing and dissolving calcium nitrate tetrahydrate and pure water in a set ratio. Mother liquor B is generated by mixing and dissolving ammonium dihydrogen phosphate and pure water in a set ratio. Mother liquor C is generated by mixing and dissolving ferrous sulfate heptahydrate, disodium ethylenediaminetetraacetate, and pure water in a set ratio.

[0007] Preferably, pressure boosting valves are also provided in the pipelines connecting the No. 1 blanking valve and the No. 4 blanking valve to the weighing instrument, namely a No. 1 pressure boosting valve and a No. 2 pressure boosting valve; these two pressure boosting valves are backup for each other. When the blanking of the No. 1 blanking valve and the No. 2 blanking valve is completed, the No. 1 pressure boosting valve will be started to send high-pressure gas into the blanking pipeline to blow residual materials. The blanking pipelines corresponding to the No. 3 blanking valve and the No. 4 blanking valve are responsible for by the No. 2 pressure boosting valve, that is, when the blanking of the No. 3 blanking valve and the No. 4 blanking valve is completed, the No. 2 pressure boosting valve will be started to send high-pressure gas into the blanking pipeline to blow residual materials; with such a setting, it can prevent materials from blocking in the discharge pipeline during the preparation of mother liquor A, mother liquor B, and mother liquor C, and smoothly export the materials through external high air pressure.

[0008] Preferably, the working fluid storage tank is provided with a No. 4 liquid level gauge, and the No. 4 liquid level gauge is electrically connected to the slave computer.

[0009] Preferably, the working fluid storage tank is also provided with a discharge valve.

[0010] Preferably, the host computer uses a Kunlun Tongtai touch screen to realize the human-machine interaction function.

[0011] Preferably, the slave computer uses an ARM industrial controller as the core control unit and combines a multi-channel IO controller to control each blanking valve, each rough valve, each fine valve, a three-way valve, and a water supply pump; the ARM industrial controller communicates with the host computer with a touch screen through its own RS-232 interface, and receives the control commands and recipe parameter setting information of the host computer.

[0012] Preferably, the ARM industrial controller communicates with the multi-channel IO controller module through its own 485 interface to complete information collection and processing; the multi-channel IO controller collects and processes liquid level information, weighing information, start and stop of power equipment, and switch in-place information through digital and analog interfaces.

[0013] Another object of the present invention is to provide a method for automatically preparing nutrient solution for damaging operations of seedlings. Using the above-mentioned automatic nutrient solution preparation system for damaging operations of seedlings, it includes the following steps: (1) Click "Start" on the touch screen of the host computer. After setting the nutrient solution formula, submit it to the slave computer as the current preparation parameter through the formula confirmation operation; (2) After the slave computer obtains the preparation parameter, wait for the user to select the preparation mode through the human-machine interaction interface. The preparation modes are "manual preparation" and "automatic preparation"; (3) If the user selects the "manual preparation" mode, the preparation process is all operated by the user on the human-machine interaction interface. First, zero the weighing instrument, then prepare the corresponding mother liquor according to the formula, and finally mix the three mother liquors into the nutrient solution. During this period, through the user's operation of the touch screen of the host computer, the switch operation commands of each valve, each screw feeder, and the water supply pump are sent to the slave computer, and the action states of each device, the liquid level gauge information, and the weighing instrument weight information are collected in real time and warning or notification information is sent to the user through the human-machine interaction interface; if the user selects the "automatic preparation" mode, a "preparation start confirmation" command is issued. After the slave computer receives the preparation start confirmation command, first zero the weighing instrument, then prepare mother liquor A, mother liquor B, and mother liquor C respectively according to the formula data, and finally mix the three mother liquors into the nutrient solution.

[0014] Preferably, the preparation process of the mother liquor A is specifically as follows: (1) Open the 1# blanking valve, 1# screw feeder, and 1# booster valve, so that calcium nitrate tetrahydrate enters the weighing instrument through the 1# screw feeder, the calcium nitrate tetrahydrate storage tank, and the 1# blanking valve in sequence; (2) If the weight of calcium nitrate tetrahydrate does not reach the set value, return to step (1). If the weight of calcium nitrate tetrahydrate reaches the set value, proceed to the next step and close the 1# feeding valve, 1# screw feeder, and 1# pressure increasing valve. (3) Calculate the water consumption required for preparing mother liquor A according to the formula. (4) Open the three-way valve to allow the calcium nitrate tetrahydrate in the weighing instrument to enter the mother liquor A storage tank, and then close the three-way valve. (5) Open the water supply pump and the 1# rough valve. Determine whether the water volume difference is less than 10% according to the water consumption required for preparing mother liquor A calculated by the formula. If so, close the 1# rough valve and open the 1# fine valve; if not, open the 1# rough valve and close the 1# fine valve until the water volume difference is less than 10%. (6) Then determine whether the water volume meets the standard according to the water consumption required for preparing mother liquor A calculated by the formula. If it meets the standard, close the 1# fine valve, the 1# rough valve, and the water inlet pump; if it does not meet the standard, continue to close the 1# rough valve and open the 1# fine valve until the water volume meets the standard.

[0015] Among them, in step (3), the target dissolution water consumption is further calculated based on the actual material weight and the dissolution ratio set in the formula. This calculation work is carried out by the controller according to the following formula (1): Formula (1) In formula (1), T is the target dissolution water consumption, w is the measured material weight, and f is the dissolution ratio set in the formula.

[0016] In step (5), the water volume difference = (target dissolution water consumption - actual water inflow) / target dissolution water consumption, and the actual water inflow refers to the PID algorithm. The acquisition work of the actual water inflow is realized according to the following formula (2): Formula (2) In formula (2), t is the acquisition period of the controller for the liquid level gauge, k is a coefficient, is the error value between the actual water inflow and the target water consumption. Formula (2) shows that when the error is smaller, the acquisition period is smaller, and the monitoring time interval of the controller for the liquid level is shorter. When the acquisition period t <= 5ms, the error can be controlled within , and users can fully accept this error range.

[0017] Preferably, the preparation process of the mother liquor B is specifically as follows: (1) Open the 2# feeding valve, 2# screw feeder, and 1# increasing valve to allow calcium dihydrogen phosphate to enter the weighing instrument through the 2# screw feeder, the calcium dihydrogen phosphate storage tank, and the 2# feeding valve in sequence. (2) If the weight of calcium dihydrogen phosphate does not reach the set value, return to step (1). If the weight of calcium dihydrogen phosphate reaches the set value, proceed to the next step and close the 2# feeding valve, 2# screw feeder, and 1# addition valve. (3) Calculate the water consumption required for preparing mother liquor B according to the formula. (4) Open the three-way valve to allow the calcium dihydrogen phosphate in the weighing instrument to enter the mother liquor B storage tank, and then close the three-way valve. (5) Open the water supply pump and 2# rough valve. According to the water consumption required for preparing mother liquor B calculated by the formula, determine whether the water volume difference is less than 10%. If so, close the 2# rough valve and open the 2# fine valve; if not, open the 2# rough valve and close the 2# fine valve until the water volume difference is less than 10%. (6) Then, according to the water consumption required for preparing mother liquor B calculated by the formula, determine whether the water volume meets the standard. If it meets the standard, close the 2# fine valve, 2# rough valve, and the water inlet pump; if it does not meet the standard, continue to close the 2# rough valve and open the 2# fine valve until the water volume meets the standard.

[0018] Preferably, the preparation process of the mother liquor C is specifically as follows: (1) Open the 3# feeding valve, 3# screw feeder, and 2# addition valve to allow ferrous sulfate heptahydrate to enter the weighing instrument through the 3# screw feeder, ferrous sulfate heptahydrate storage tank, and 3# feeding valve in sequence. (2) If the weight of ferrous sulfate heptahydrate does not reach the set value, return to step (1). If the weight of ferrous sulfate heptahydrate reaches the set value, proceed to the next step and close the 3# feeding valve, 3# screw feeder, and 2# addition valve. (3) Open the 4# feeding valve, 4# screw feeder, and 2# addition valve to allow disodium ethylenediaminetetraacetate to enter the weighing instrument through the 3# screw feeder, disodium ethylenediaminetetraacetate storage tank, and 4# feeding valve in sequence. (4) If the weight of disodium ethylenediaminetetraacetate does not reach the set value, return to step (3). If the weight of disodium ethylenediaminetetraacetate reaches the set value, proceed to the next step and close the 3# feeding valve, 3# screw feeder, and 2# addition valve. (5) Calculate the water consumption required for preparing mother liquor C according to the formula. (6) Open the three-way valve to allow ferrous sulfate heptahydrate and disodium ethylenediaminetetraacetate in the weighing instrument to enter the mother liquor C storage tank, and then close the three-way valve. (7) Open the water supply pump and 3# rough valve. According to the water consumption required for preparing mother liquor C calculated by the formula, determine whether the water volume difference is less than 10%. If so, close the 3# rough valve and open the 3# fine valve; if not, open the 3# rough valve and close the 3# fine valve until the water volume difference is less than 10%. (8) Then, based on the formula calculation, determine whether the water volume required for preparing mother liquor C meets the standard. If it meets the standard, close the 3# fine discharge valve and the 3# rough discharge valve, and turn off the water inlet pump; if it does not meet the standard, continue to close the 3# rough discharge valve and open the 3# fine discharge valve until the water volume meets the standard.

[0019] Compared with the prior art, the advantages of the present invention are as follows: (1) The automatic preparation system for the nutrient solution for damaged nursery stock operations of the present invention can automatically complete the calculation, ingredient modulation, and transfer tasks in each link of the nutrient solution preparation process according to the user's preparation requirements, effectively reducing the impact brought by various adverse factors of manual operations.

[0020] (2) In order to avoid the situation that there is a certain distance from the discharge pipeline to the weighing instrument and there is a certain residue of materials in the pipeline, the present invention adopts two booster valves to input high-pressure gas into the pipeline to purge the residual materials in the pipeline. The 1# booster valve is responsible for purging the materials falling from the 1# blanking valve and the 2# blanking valve, and the 2# booster valve is responsible for purging the materials of the 3# blanking valve and the 4# blanking valve. In addition, the present invention further calculates the target dissolution water volume based on the actual material weight and the dissolution ratio set by the formula, and real-time detects the water inflow volume in the container through a liquid level gauge. In order to ensure that the error between the actual dissolution water inflow volume and the target dissolution water volume is as small as possible, among them, the acquisition of the actual water inflow volume is realized by referring to the PID algorithm to further reduce the error, and the method of regulating the switching of the rough discharge valve and the fine discharge valve according to the liquid level parameter is also adopted to prevent the overshoot of the water inflow volume, which can effectively reduce the manufacturing cost. Description of the Drawings

[0021] Figure 1 It is a flowchart of the preparation of the nutrient solution for damaged nursery stock operations in the prior art.

[0022] Figure 2 It is a schematic structural diagram of the automatic preparation system for the nutrient solution for damaged nursery stock operations of the present invention.

[0023] Figure 3 It is a flowchart of the operation of the automatic preparation system for the nutrient solution for damaged nursery stock operations of the present invention.

[0024] Figure 4 It is a flowchart of the automatic preparation operation of mother liquor A in the nutrient solution for damaged nursery stock operations of the present invention. Detailed Embodiments

[0025] The present invention will be further described in detail below with reference to the embodiments of the drawings.

[0026] As Figure 1 shown, it is a schematic structural diagram of the automatic preparation system for the nutrient solution for damaged nursery stock operations of the present invention.

[0027] An automatic nutrient solution preparation system for damaged nursery stock operations, including a mother liquor A preparation unit, a mother liquor B preparation unit, and a mother liquor C preparation unit. The mother liquor A preparation unit includes a No. 1 screw feeder, a calcium nitrate tetrahydrate storage tank, and a No. 1 blanking valve connected in sequence. The mother liquor B preparation unit includes a No. 2 screw feeder, a calcium dihydrogen phosphate storage tank, and a No. 2 blanking valve connected in sequence. The mother liquor C preparation unit includes a No. 3 screw feeder, a ferrous sulfate heptahydrate storage tank, and a No. 3 blanking valve connected in sequence. The mother liquor C preparation unit also includes a No. 4 screw feeder, a disodium ethylenediaminetetraacetate storage tank, and a No. 4 blanking valve connected in sequence. The No. 1 blanking valve, No. 2 blanking valve, No. 3 blanking valve, and No. 4 blanking valve are respectively connected to a weighing instrument, and the weighing instrument is connected to a three-way valve. The three-way valve is respectively connected to a mother liquor A storage tank, a mother liquor B storage tank, and a mother liquor C storage tank. The mother liquor A storage tank is also respectively connected to a water supply pump through a No. 1 rough discharge valve and a No. 1 fine discharge valve. The mother liquor B storage tank is also respectively connected to a water supply pump through a No. 2 rough discharge valve and a No. 2 fine discharge valve. The mother liquor C storage tank is also respectively connected to a water supply pump through a No. 3 rough discharge valve and a No. 3 fine discharge valve. The mother liquor A storage tank, the mother liquor B storage tank, and the mother liquor C storage tank are respectively connected to a working fluid storage tank through a discharge valve. The mother liquor A storage tank, the mother liquor B storage tank, and the mother liquor C storage tank are respectively provided with liquid level gauges, namely a No. 1 liquid level gauge, a No. 2 liquid level gauge, and a No. 3 liquid level gauge. The working fluid storage tank is provided with a No. 4 liquid level gauge. The working fluid storage tank is also provided with a discharge valve. The prepared nutrient solution flows out through the discharge valve.

[0028] The automatic preparation system also includes a control component. The control component includes a host computer with a touch screen. The host computer uses a Kunlun Tongtai touch screen to realize the human-machine interaction function. The host computer is electrically connected to a slave computer. The slave computer is respectively electrically connected to each of the above-mentioned screw feeders, blanking valves, rough discharge valves, fine discharge valves, liquid level gauges, three-way valve, weighing instrument, and water supply pump. The slave computer uses an ARM industrial controller as the core control unit and combines a multi-channel IO controller to control each blanking valve, rough discharge valve, fine discharge valve, three-way valve, and water supply pump. The ARM industrial controller communicates with the host computer with a touch screen through its own RS-232 interface, and receives the host computer control command and formula parameter setting information. The ARM industrial controller communicates with the multi-channel IO controller module through its own 485 interface to complete information acquisition and processing. The multi-channel IO controller realizes the acquisition and processing of liquid level information, weighing information, start and stop of power equipment, and switch in-place information through digital and analog interfaces.

[0029] Among them, mother liquor A is generated by mixing and dissolving calcium nitrate tetrahydrate and pure water in a set ratio. Mother liquor B is generated by mixing and dissolving ammonium dihydrogen phosphate and pure water in a set ratio. Mother liquor C is generated by mixing and dissolving ferrous sulfate heptahydrate, disodium ethylenediaminetetraacetate, and pure water in a set ratio.

[0030] Among them, pressure increasing valves are also provided in the pipelines connecting the 1# blanking valve and the 4# blanking valve to the weighing instrument, namely the 1# pressure increasing valve and the 2# pressure increasing valve. The 1# pressure increasing valve is responsible for guiding the blanking of No. 1 and No. 2, and the 2# pressure increasing valve is responsible for guiding the blanking of No. 3 and No. 4. When preparing mother liquor A, mother liquor B, and mother liquor C, it can prevent materials from clogging in the discharge pipeline and smoothly export the materials through external high air pressure.

[0031] As Figure 3 shown, it is the working flow chart of the automatic preparation system for nutrient solution for damaged nursery stock operations of the present invention.

[0032] An automatic preparation method for nutrient solution for damaged nursery stock operations, using the above-mentioned automatic preparation system for nutrient solution for damaged nursery stock operations, includes the following steps: (1) Click "Start" on the touch screen of the upper computer. After setting the nutrient solution formula, submit it to the lower computer as the current preparation parameter through the formula confirmation operation; (2) After the lower computer obtains the preparation parameters, wait for the user to select the preparation mode through the man-machine interface. The preparation modes are two modes: "manual preparation" and "automatic preparation"; (3) If the user selects the "manual preparation" mode, the preparation process is all operated by the user on the man-machine interface. First, zero the weighing instrument, then prepare the corresponding mother liquor according to the formula, and finally mix the three mother liquors into the nutrient solution. During this period, by operating the touch screen of the upper computer by the user, the switch operation commands of each valve, each screw feeder, and the water pump are sent to the lower computer, and the action status of each device, the liquid level gauge information, and the weighing instrument weight information are collected in real time and warning or notification information is sent to the user through the man-machine interface; if the user selects the "automatic preparation" mode, a "preparation start confirmation" command is issued. When the lower computer receives the preparation start confirmation command, first zero the weighing instrument, then prepare mother liquor A, mother liquor B, and mother liquor C respectively according to the formula data, and finally mix the three mother liquors into the nutrient solution.

[0033] As Figure 4 shown, it is the working flow chart of the automatic preparation of mother liquor A in the nutrient solution for damaged nursery stock operations of the present invention.

[0034] Among them, the preparation process of mother liquor A is specifically as follows: (1) Open the 1# blanking valve, the 1# screw feeder, and the 1# pressure increasing valve, so that calcium nitrate tetrahydrate enters the weighing instrument through the 1# screw feeder, the calcium nitrate tetrahydrate storage tank, and the 1# blanking valve in sequence; (2) If the weight of calcium nitrate tetrahydrate does not reach the set value, return to step (1). If the weight of calcium nitrate tetrahydrate reaches the set value, proceed to the next step and close the 1# blanking valve, the 1# screw feeder, and the 1# pressure increasing valve; (3) Calculate the water consumption required to prepare mother liquor A according to the formula; (4) Open the three-way valve to allow calcium nitrate tetrahydrate in the weighing instrument to enter the mother liquor A storage tank, and then close the three-way valve. (5) Open the feed water pump and the 1# rough valve. Based on the formula, calculate whether the water volume difference is less than 10% according to the water consumption required to prepare mother liquor A. If so, close the 1# rough valve and open the 1# fine valve; if not, open the 1# rough valve and close the 1# fine valve until the water volume difference is less than 10%. (6) Then, based on the formula, calculate whether the water volume meets the standard according to the water consumption required to prepare mother liquor A. If it meets the standard, close the 1# fine valve, the 1# rough valve, and the feed water pump; if it does not meet the standard, continue to close the 1# rough valve and open the 1# fine valve until the water volume meets the standard.

[0035] Among them, in step (3), further calculate the target dissolution water consumption according to the actual material weight and the dissolution ratio set in the formula. This calculation work is carried out by the controller according to the following formula (1): Formula (1) In formula (1), T is the target dissolution water consumption, w is the measured material weight, and f is the dissolution ratio set in the formula.

[0036] In step (5), the water volume difference = (target dissolution water consumption - actual water inflow) / target dissolution water consumption, and the actual water inflow refers to the PID algorithm and realizes the acquisition work of the actual water inflow according to the following formula (2): Formula (2) In formula (2), t is the acquisition period of the controller for the liquid level gauge, k is the coefficient, is the error value between the actual water inflow and the target water consumption. Formula (2) shows that when the error is smaller, the acquisition period is smaller, and the monitoring time interval of the controller for the liquid level is shorter. When the acquisition period t <= 5ms, the error can be controlled within , and users can fully accept this error range.

[0037] The preparation process of mother liquor B is specifically as follows: (1) Open the 2# feeding valve, the 2# screw feeder, and the 1# increasing valve to allow calcium dihydrogen phosphate to enter the weighing instrument through the 2# screw feeder, the calcium dihydrogen phosphate storage tank, and the 2# feeding valve in sequence. (2) If the weight of calcium dihydrogen phosphate does not reach the set value, return to step (1). If the weight of calcium dihydrogen phosphate reaches the set value, proceed to the next step and close the 2# feeding valve, the 2# screw feeder, and the 1# increasing valve. (3) Calculate the water consumption required to prepare mother liquor B according to the formula. (4) Open the three-way valve to allow calcium dihydrogen phosphate in the weighing instrument to enter the mother liquor B storage tank, and then close the three-way valve. (5) Turn on the feed water pump and the 2# rough valve. Determine whether the water volume difference is less than 10% based on the water consumption required for preparing mother liquor B according to the formula. If so, close the 2# rough valve and turn on the 2# fine valve; if not, turn on the 2# rough valve and close the 2# fine valve until the water volume difference is less than 10%. (6) Then determine whether the water volume meets the standard based on the water consumption required for preparing mother liquor B according to the formula. If it meets the standard, close the 2# fine valve, the 2# rough valve, and the feed water pump; if it does not meet the standard, continue to close the 2# rough valve and turn on the 2# fine valve until the water volume meets the standard.

[0038] The preparation process of mother liquor C is specifically as follows: (1) Turn on the 3# feeding valve, the 3# screw feeder, and the 2# addition valve, so that ferrous sulfate heptahydrate enters the weighing instrument through the 3# screw feeder, the ferrous sulfate heptahydrate storage tank, and the 3# feeding valve in sequence. (2) If the weight of ferrous sulfate heptahydrate does not reach the set value, return to step (1). If the weight of ferrous sulfate heptahydrate reaches the set value, proceed to the next step and close the 3# feeding valve, the 3# screw feeder, and the 2# addition valve. (3) Turn on the 4# feeding valve, the 4# screw feeder, and the 2# addition valve, so that disodium ethylenediaminetetraacetate enters the weighing instrument through the 3# screw feeder, the disodium ethylenediaminetetraacetate storage tank, and the 4# feeding valve in sequence. (4) If the weight of disodium ethylenediaminetetraacetate does not reach the set value, return to step (3). If the weight of disodium ethylenediaminetetraacetate reaches the set value, proceed to the next step and close the 3# feeding valve, the 3# screw feeder, and the 2# addition valve. (5) Calculate the water consumption required for preparing mother liquor C according to the formula. (6) Turn on the three-way valve, so that ferrous sulfate heptahydrate and disodium ethylenediaminetetraacetate in the weighing instrument enter the mother liquor C storage tank, and then close the three-way valve. (7) Turn on the feed water pump and the 3# rough valve. Determine whether the water volume difference is less than 10% based on the water consumption required for preparing mother liquor C according to the formula. If so, close the 3# rough valve and turn on the 3# fine valve; if not, turn on the 3# rough valve and close the 3# fine valve until the water volume difference is less than 10%. (8) Then determine whether the water volume meets the standard based on the water consumption required for preparing mother liquor C according to the formula. If it meets the standard, close the 3# fine valve, the 3# rough valve, and the feed water pump; if it does not meet the standard, continue to close the 3# rough valve and turn on the 3# fine valve until the water volume meets the standard.

[0039] In addition to the above embodiments, the present invention also includes other implementation manners. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. An automatic nutrient solution preparation system for seedling damage operations, characterized in that: The invention comprises a mother liquor A preparation unit, a mother liquor B preparation unit and a mother liquor C preparation unit, wherein the mother liquor A preparation unit comprises a 1# screw feeder, a calcium nitrate tetrahydrate storage tank and a 1# discharge valve connected in sequence, the mother liquor B preparation unit comprises a 2# screw feeder, a calcium dihydrogen phosphate storage tank and a 2# discharge valve connected in sequence, the mother liquor C preparation unit comprises a 3# screw feeder, a ferrous sulfate heptahydrate storage tank and a 3# discharge valve connected in sequence, the mother liquor C preparation unit also comprises a 4# screw feeder, a disodium ethylenediaminetetraacetic acid storage tank and a 4# discharge valve connected in sequence, the 1# discharge valve, the 2# discharge valve, the 3# discharge valve and the 4# discharge valve are respectively The mother liquid A tank is connected to a weighing instrument, the weighing instrument is connected to a three-way valve, the three-way valve is connected to the mother liquid A tank, the mother liquid B tank, and the mother liquid C tank, respectively, the mother liquid A tank is also connected to the water supply pump via the 1# rough valve and the 1# fine valve, the mother liquid B tank is also connected to the water supply pump via the 2# rough valve and the 2# fine valve, the mother liquid C tank is also connected to the water supply pump via the 3# rough valve and the 3# fine valve, the mother liquid A tank, the mother liquid B tank, and the mother liquid C tank are connected to the working liquid storage tank via the discharge valve, and the mother liquid A tank, the mother liquid B tank, and the mother liquid C tank are respectively provided with liquid level gauges, which are the 1# liquid level gauge, the 2# liquid level gauge, and the 3# liquid level gauge; The automatic preparation system also includes a control component, which includes a host computer with a touch screen, the host computer is electrically connected to a slave computer, and the slave computer is electrically connected to the above-mentioned screw feeders, each discharge valve, each rough valve, each fine discharge valve, each liquid level gauge, three-way valve, weighing instrument, and water supply pump.

2. The automatic nutrient solution preparation system for seedling damage operations according to claim 1, characterized in that: The pipelines connecting the 1# discharge valve and the 4# discharge valve to the weighing instrument are also provided with boost valves, namely, the 1# boost valve and the 2# boost valve.

3. The automatic nutrient solution preparation system for seedling damage operations according to claim 1, characterized in that: The working fluid storage tank is provided with a 4# liquid level gauge, the 4# liquid level gauge is electrically connected to the lower machine, and the working fluid storage tank is also provided with a discharge valve.

4. The automatic nutrient solution preparation system for seedling damage operations according to claim 1, characterized in that: The host computer adopts Kunlun touch screen to realize the human-computer interaction function.

5. The automatic nutrient solution preparation system for seedling damage operations according to claim 1, characterized in that: The lower computer uses the ARM industrial controller as the core control unit and combines with a multi-channel IO controller to realize the control of each unloading valve, each rough valve, each fine valve, three-way valve, and water pump; the ARM industrial controller communicates with the upper computer with a touch screen through its own RS-232 interface, and accepts the upper computer control commands and recipe parameter setting information.

6. The automatic nutrient solution preparation system for seedling damage operations according to claim 5, characterized in that: The ARM industrial controller communicates with the multi-channel IO controller module through its own 485 interface to complete information collection and processing; the multi-channel IO controller collects and processes liquid level information, weighing information, start and stop of power equipment, and switch in place information through digital and analog interfaces.

7. A method for automatically preparing nutrient solution for seedling damage operations, characterized in that: The automatic nutrient solution preparation system for seedling-damaging operations according to any one of claims 1 to 7 comprises the following steps: (1) Click Start on the touch screen of the host computer, set the nutrient solution formula, and submit it to the slave computer as the current preparation parameters through the formula confirmation operation; (2) After the lower computer obtains the configuration parameters, it waits for the user to select the configuration mode through the human-computer interaction interface. The configuration modes include "manual configuration" and "automatic configuration"; (3) If the user selects the "manual preparation" mode, the user will operate the preparation process on the human-computer interaction interface. First, the weighing instrument will be reset to zero, and then the corresponding mother liquor will be prepared according to the formula. Finally, the three mother liquors will be mixed into a nutrient solution. During this period, the user will operate the touch screen of the upper computer so that the switch operation commands of each valve, each screw feeder, and water pump will be sent to the lower computer, and the action status, liquid level meter information and weighing instrument weight information of each device will be collected in real time, and an early warning or notification information will be issued to the user through the human-computer interaction interface; if the user selects the "automatic preparation" mode, the "preparation start confirmation" command will be issued. After the lower computer receives the preparation start confirmation command, it will first reset the weighing instrument, and then prepare mother liquor A, mother liquor B and mother liquor C respectively according to the formula data, and finally mix the three mother liquors into a nutrient solution.

8. The method for automatically preparing nutrient solution for seedling-damaging operations according to claim 7, characterized in that: The preparation process of the mother solution A is specifically as follows: (1) Open the 1# discharge valve, 1# screw feeder, and 1# booster valve to allow the calcium nitrate tetrahydrate to enter the weighing instrument through the 1# screw feeder, the calcium nitrate tetrahydrate storage tank, and the 1# discharge valve in sequence; (2) If the weight of calcium nitrate tetrahydrate does not reach the set value, return to step (1); if the weight of calcium nitrate tetrahydrate reaches the set value, proceed to the next step and close the 1# discharge valve, 1# screw feeder, and 1# booster valve; (3) Calculate the amount of water required to prepare mother solution A according to the formula; (4) Open the three-way valve to allow the calcium nitrate tetrahydrate in the weighing instrument to enter the mother solution A storage tank, and then close the three-way valve; (5) Open the water supply pump and 1# rough valve, and calculate the amount of water required to prepare mother liquor A according to the formula to determine whether the water volume difference is less than 10%. If so, close 1# rough valve and open 1# fine valve; if not, open 1# rough valve and close 1# fine valve until the water volume difference is less than 10%; (6) Calculate the amount of water required to prepare mother liquor A according to the formula to determine whether the water volume meets the standard. If it does, close the 1# fine valve and 1# rough valve, and turn off the water inlet pump. If it does not meet the standard, continue to close the 1# rough valve and open the 1# fine valve until the water volume meets the standard.

9. The method for automatically preparing nutrient solution for seedling-damaging operations according to claim 8, characterized in that: The amount of water required in step (3) is calculated based on the actual material weight and the dissolution ratio set in the formula. The calculation is performed by the controller according to the following formula: ； T is the target amount of water used for dissolution, w is the measured material weight, and f is the dissolution ratio set in the formula.

10. The method for automatically preparing nutrient solution for seedling-damaging operations according to claim 8, characterized in that: Step (5) Water volume difference = (target water volume for dissolution - actual water volume for dissolution) / target water volume for dissolution. The actual water volume for dissolution is calculated by referring to the PID algorithm. The following formula is used to collect the actual water volume for dissolution: ； t is the controller's acquisition cycle for the liquid level meter, k is the coefficient, It is the error value between the actual water intake and the target water consumption.

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