A knapsack sprayer and method of using same

Abstract

The present application relates to a kind of knapsack sprayer and its application method, it relates to the field of agricultural plant protection technology, it includes the liquid storage tank for containing liquid medicine with liquid storage cavity, for the liquid medicine in liquid storage tank is atomized and sprayed spray gun and the knapsack assembly for being used to carry with shoulder strap, liquid storage tank is installed in for the bi-directional flow power of liquid medicine delivery to provide delivery pump, with quantitative bin and for the quantitative delivery of liquid medicine entering by spray gun quantitative assembly and for the three-way valve of delivery pump, quantitative bin and liquid storage cavity communication;Quantitative assembly includes for the one-way valve of liquid medicine from quantitative bin one-way flow into liquid storage cavity and the piston structure for the liquid medicine in quantitative bin is pushed out from one-way valve.The present application has the effect of accurately controlling the matching dose of liquid medicine and clean water, ensure that mixed liquid medicine concentration is stable.

Description

Technical Field

[0001] This invention relates to the field of agricultural plant protection technology, and in particular to a backpack sprayer and its application method. Background Technology

[0002] To achieve functions such as pest and disease control, nutrient supply, and disinfection, liquid agents (pesticides, disinfectants, foliar fertilizers, etc.) need to be evenly atomized or sprayed onto the target object.

[0003] As the mainstream application equipment in the field of agricultural plant protection, backpack sprayers usually rely on manual measurement of pesticide solution and water, mixing and injecting it into the storage chamber of the storage tank, and then spraying it out through the spray gun. During the spraying operation, the operator carries the storage tank on his back through shoulder straps to achieve portable operation.

[0004] However, it is difficult to accurately control the ratio of pesticide solution to water by manually measuring it, which can easily lead to the concentration of the mixed solution being too high or too low, thereby causing crop damage or reducing the control effect. Summary of the Invention

[0005] In order to accurately control the ratio and dosage of the medicine and water and ensure the stability of the mixed medicine concentration, this invention provides a backpack sprayer and its application method.

[0006] In a first aspect, the present invention provides a backpack sprayer, which adopts the following technical solution: A backpack sprayer includes a reservoir tank with a storage chamber for containing liquid medicine, a spray gun for atomizing and spraying the liquid medicine in the reservoir tank, and a carrying assembly with shoulder straps for carrying on the back. The reservoir tank is characterized by having a delivery pump for providing bidirectional flow power for liquid medicine delivery, a metering assembly with a metering chamber for metering the liquid medicine entering through the spray gun, and a three-way valve connecting the delivery pump, the metering chamber, and the reservoir tank. The metering component includes a one-way valve for allowing liquid medicine to flow unidirectionally from the metering chamber into the storage chamber, and a piston structure for pushing the liquid medicine in the metering chamber out of the one-way valve.

[0007] By adopting the above technical solution, a delivery pump is used to provide stable power to the liquid medicine. A three-way valve is used to switch the flow path between the delivery pump and the metering tank and the storage chamber. With the one-way valve and piston structure of the metering component, the liquid medicine can be metered and replenished without having to put down the storage tank, thus reducing the number of steps for operators.

[0008] Optionally, the shoulder strap is fixedly installed on one side of the reservoir, and the carrying assembly also includes a ventilated back panel for conforming to the back of the human body, the ventilated back panel being detachably installed on the side of the reservoir near the shoulder strap; The ventilation back panel has a raised buffer block on the side away from the liquid storage tank to increase friction and create a ventilation gap when it fits against the back of the human body.

[0009] By adopting the above technical solution, when the back is in contact with the ventilation back panel, the raised buffer blocks on the ventilation back panel form a ventilation gap between the raised buffer blocks, which accelerates air circulation, dissipates sweat and heat generated by equipment operation in a timely manner, and increases the friction between the back panel and the back of the human body, thereby improving work stability and effectively improving comfort.

[0010] Optionally, the carrying assembly also includes a lumbar support for lumbar support, which is detachably mounted on the side of the reservoir near the shoulder strap.

[0011] By adopting the above technical solutions, the load of the equipment is distributed from the shoulders to the waist and pelvis, reducing the pressure on the shoulders and lumbar spine, alleviating muscle fatigue and the risk of strain. At the same time, the detachable design makes it easy for people of different body types to use, improving the versatility of the equipment.

[0012] Secondly, this application provides a method for applying a backpack sprayer, employing the following technical solution: A method of applying a backpack sprayer, used in a backpack sprayer as described in the first aspect, comprising: S10: Insert one end of the spray gun into the preset liquid tank and respond to the replenishment signal to obtain the required amount of medicine, the required amount of water, and equipment data; S11: Determine the actual amount of medication needed in the quantitative storage bin by combining equipment data and required medication quantity; S12: Match the refill parameters of the delivery pump to control the reverse direction according to the required drug dosage; S13: Control the three-way valve to connect the delivery pump to the metering chamber, control the operation of the delivery pump based on the replenishment parameters and collect the actual amount of medicine in the metering chamber until the actual amount of medicine matches the metering amount, and control the delivery pump to stop. S14: Match and control the delivery parameters of the delivery pump circulation delivery and the airflow parameters of the preset blowing equipment according to the required amount of medicine and water. S15: Based on the required water volume, inject water into the storage chamber and control the piston structure to inject the liquid medicine in the metering chamber into the storage chamber to form a mixture. Insert one end of the spray gun into the storage chamber. S16: In response to the insertion of the mixing signal, control the three-way valve to connect the delivery pump to the storage chamber, control the delivery pump to circulate the mixed liquid based on the delivery parameters, and control the air blowing device to output low-pressure airflow based on the airflow parameters. The low-pressure airflow passes through the preset reversing valve and is ejected from the preset annular air outlet at the end of the spray gun and enters the storage chamber. S17: Orient the spray gun toward the area to be sprayed and, in response to the execution signal, obtain the spraying parameters; S18: Controls the operation of the three-way valve, delivery pump, and spray gun based on spraying parameters to spray the mixture from the spray gun.

[0013] By adopting the above technical solution, the reverse operation of the delivery pump drives the spray gun to draw the liquid medicine into the metering chamber in the reverse direction. The metering chamber is used to achieve the quantitative preparation of the liquid medicine. Combined with the air blowing from the annular air outlet of the blowing device, the air blowing out when the spray gun is inserted into the liquid medicine will stir the mixture and improve the uniformity of the mixture.

[0014] Optionally, after ensuring the actual dosage matches the pre-quantitative dosage and controlling the delivery pump to stop, the following may also be included: S20: Match the water replenishment parameters of the control pump to reverse according to the required water volume, and insert one end of the spray gun into the preset clean water tank. S21: In response to the suction and water replenishment signal, control the three-way valve to connect the delivery pump to the storage chamber, control the delivery pump to run in reverse based on the water replenishment parameters and collect the actual liquid volume in the storage chamber until the actual liquid volume is consistent with the required water volume, and control the delivery pump to stop. S22: The control piston structure injects the liquid medicine in the metering chamber into the storage chamber to form a mixture; S23: Based on the airflow parameters, the blowing device outputs low-pressure airflow, which is then ejected from the inside of the liquid storage chamber through a preset reversing valve.

[0015] By adopting the above technical solution, after quantitatively drawing up the liquid medicine, the three-way valve is used to connect the delivery pump and the storage chamber. With the reverse suction of the delivery pump, clean water is directly introduced into the storage chamber without having to lower the storage tank, thus reducing the number of steps for operators.

[0016] Optionally, controlling the operation of the delivery pump based on spraying parameters includes: S30: Obtain the spraying mode and spraying intensity from the spraying parameters. The spraying mode includes water spraying and mist spraying. S31: Match the opening angle of the annular air outlet and the basic blowing intensity according to the spraying pattern; S32: Determine the blowing intensity based on the spraying intensity and the basic blowing intensity; S33: Based on the spray pattern, collect data on the impact of external airflow on the front end of the spray gun; S34: Correct the opening and closing angle and blowing intensity based on the impact data; S35: Integrates the opening angle and blowing intensity to obtain and execute the blowing assistance command.

[0017] By adopting the above technical solution, during the spraying operation, the opening and closing angle and blowing intensity are matched according to the spraying mode and spraying intensity, and an air curtain is formed on the outside of the sprayed water flow through the annular air outlet, which reduces droplet drift loss and the risk of pesticide damage.

[0018] Optionally, methods for correcting the opening angle and blowing intensity include: S40: Read wind direction and wind speed parameters from the impact data; S41: Determine the wind direction angle corresponding to the preset air outlet number by using wind direction parameters; S42: Match the wind direction angle coefficient and wind direction intensity coefficient according to the wind direction angle, and match the wind speed correction coefficient according to the wind speed parameter; S43: Based on different vent numbers and corresponding wind direction angles, the opening and closing angles and blowing intensity are corrected by combining wind direction angle coefficient, wind direction intensity coefficient and wind speed correction coefficient.

[0019] By adopting the above technical solution, wind direction and wind speed parameters are converted into quantitative correction coefficients, and precise control is achieved by combining them with the jet direction corresponding to the vent number. This enables zoned and differentiated correction of airflow parameters, reducing the waste of airflow energy caused by indiscriminate adjustment.

[0020] Alternatively, methods for correcting the opening angle and blowing intensity also include: S50: The wind outlet numbers are divided into no-impact numbers, headwind numbers, and tailwind numbers based on the wind direction angle; S51: Based on the unaffected numbering, no correction is needed for the opening angle and blowing intensity; S52: Based on the headwind number, the corrected opening and closing angle is calculated by multiplying the opening and closing angle, the wind direction angle coefficient, and the wind speed correction coefficient. The corrected blowing intensity is calculated by multiplying the blowing intensity, the wind direction intensity coefficient, and the wind speed correction coefficient. S53: Based on the downwind number, calculate the corrected opening and closing angle by quotienting the opening and closing angle with the wind speed correction coefficient, and calculate the corrected blowing intensity by quotienting the blowing intensity with the wind speed correction coefficient.

[0021] By adopting the above technical solution, the wind outlet is classified based on the wind direction angle, and different modifications are made for headwind, tailwind, and unaffected areas. The airflow constraint capability is enhanced in headwind areas, the airflow intensity is reduced in tailwind areas to avoid excessive fog droplet diffusion, and the basic parameters are maintained in unaffected areas.

[0022] Optional, also includes: S60: Insert one end of the spray gun into the preset clean water tank and read the liquid storage data from the equipment data in response to the cleaning pumping signal; S61: Determine the cleaning parameters, cleaning volume, and corresponding suction parameters based on the liquid storage data; S62: Control the three-way valve to connect the delivery pump to the storage chamber, control the delivery pump to run in reverse based on the suction parameters and collect the actual liquid volume in the storage chamber until the actual liquid volume is consistent with the cleaning water volume, and control the delivery pump to stop. S63: Insert one end of the spray gun into the liquid storage chamber and, in response to the cleaning water spray signal, control the delivery pump to run in the forward direction based on the cleaning parameters to drive water flow from the spray gun to clean the inner wall of the liquid storage chamber. S64: After cleaning, point the spray gun outwards and spray water to drain the cleaning wastewater.

[0023] By adopting the above technical solution, the pump is reversed to draw in clean water, and then the inside of the liquid storage chamber is circulated and rinsed with a spray gun, which reduces the probability of cross-contamination between different liquids. At the same time, the airflow from the annular air outlet is used to increase the cleaning effect.

[0024] Optionally, in response to the cleaning water spray signal, the system may also include: S70: Determine the jetting parameters based on the liquid storage data; S71: Based on the jet parameters, the blowing device outputs a low-pressure airflow. The low-pressure airflow passes through the reversing valve and is ejected from the annular air outlet at the end of the spray gun and enters the liquid storage chamber. S72: Collect the actual liquid volume in the storage chamber; S73: When the actual liquid volume is not greater than the preset empty liquid volume, control the reversing valve to make the low-pressure airflow output by the air blowing equipment directly spray out from the liquid storage chamber.

[0025] By adopting the above technical solution and utilizing the state adjustment of the reversing valve, after the clean wastewater is discharged, the airflow is directly introduced into the liquid storage chamber through the reversing valve to achieve airflow drying of the liquid storage chamber, reduce residual water, and lower the probability of pipeline corrosion caused by residual water.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: When the back is in contact with the ventilated back panel, the raised buffer blocks on the ventilated back panel create ventilation gaps between them, which accelerates air circulation and dissipates sweat and heat generated by the equipment in a timely manner. At the same time, it increases the friction between the back panel and the back of the human body, improves the stability of operation, and effectively improves comfort. The reverse operation of the delivery pump drives the spray gun to draw the liquid medicine into the metering chamber in the opposite direction. The metering chamber is used to achieve the metered preparation of the liquid medicine. Combined with the air blowing equipment blowing air from the annular air outlet, the air blowing air when the spray gun is inserted into the liquid medicine will stir the mixture and improve the uniformity of the mixture. The system uses a reverse pump to draw in clean water, and then uses a spray gun to circulate and rinse the inside of the storage chamber, reducing the probability of cross-contamination between different solutions. At the same time, the airflow from the annular air outlet increases the cleaning effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a backpack sprayer according to this application; Figure 2This is a simplified structural diagram of a backpack sprayer according to this application.

[0028] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Liquid storage tank; 11. Liquid storage chamber; 12. Liquid inlet; 13. Filter screen; 14. Observation window; 15. Liquid volume scale; 2. Spray gun; 3. Backpack assembly; 31. Ventilated back panel; 311. Raised buffer block; 32. Shoulder strap; 33. Waist support; 4. Transfer pump; 5. Metering assembly; 51. Metering chamber; 52. One-way valve; 53. Piston structure; 531. Miniature linear motor; 532. Push plate; 6. Three-way valve. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a backpack sprayer.

[0031] Reference Figure 1 A backpack sprayer includes a liquid storage tank 1, a spray gun 2, and a backpack assembly 3, with the backpack assembly 3 and the spray gun 2 mounted on the liquid storage tank 1.

[0032] The carrying assembly 3 includes a ventilated back panel 31, shoulder straps 32, and a lumbar support 33. The shoulder straps 32 are fixedly installed on one side of the liquid storage tank 1 and there are two symmetrically arranged. The ventilated back panel 31 and the lumbar support 33 can be detachably installed on the side of the liquid storage tank 1 near the shoulder straps 32. The side of the ventilated back panel 31 away from the liquid storage tank 1 is provided with multiple raised buffer blocks 311. The multiple raised buffer blocks 311 are arranged in a matrix and are arranged along the curve of the human back muscles. Ventilation gaps are formed between the raised buffer blocks 311. The lumbar support 33 is designed to fit the curve of the waist in an arc shape.

[0033] Reference Figure 2The storage tank 1 has a storage cavity 11, and two inlets 12 communicating with the storage cavity 11 are provided on the storage tank 1. A filter screen 13 is provided at each inlet 12. A transparent observation window 14 is provided on the side wall of the storage tank 1, and a liquid volume scale 15 is provided on one side of the observation window 14. The storage tank 1 also contains a delivery pump 4, a metering assembly 5, and a three-way valve 6. The metering assembly 5 includes a metering chamber 51, a one-way valve 52, and a piston structure 53. The piston structure 53 includes a micro linear motor 531 and a pusher plate 532. The delivery pump 4 can rotate in both directions to achieve bidirectional delivery. In this embodiment, the delivery pump 4 is a diaphragm pump. The two ends of 4 are connected to the spray gun 2 and the three-way valve 6 respectively. The two ends of the three-way valve 6 are connected to the metering chamber 51 and the storage chamber 11 respectively. The three-way valve 6 can control the connection between the delivery pump 4 and the metering chamber 51 and the storage chamber 11 by switching the state of the valve core. The push plate 532 is fixedly connected to the output end of the micro linear motor 531. The micro linear motor 531 drives the push plate 532 to slide in the metering chamber 51. A sealing ring is provided between the push plate 532 and the inner wall of the metering chamber 51 to achieve dynamic sealing. The one-way valve 52 is installed at one end of the metering chamber 51 to restrict the liquid from flowing only from the metering chamber 51 to the storage chamber 11.

[0034] During normal use, a measured amount of medicine and water are injected into the storage chamber 11 through the inlet 12 to form a mixture. The mixture is then observed through the observation window 14 and the volume scale 15. The filter 13 filters the medicine and water. After the mixture is evenly mixed, the operator carries the storage tank 1 on their back using the shoulder strap 32. At this time, the operator's back is in contact with the raised buffer block 311 and their waist is in contact with the waist support 33. The raised buffer block 311 absorbs vibration and impact during walking and reduces the direct pressure of the hard box on the back. At the same time, the ventilation gap between the raised buffer blocks 311 improves air circulation and removes heat and moisture from the back. The delivery pump 4 is started to drive the mixture in the storage chamber 11 to enter through the three-way valve 6 and spray out through the spray gun 2 to achieve the spraying operation.

[0035] To facilitate replenishment of medicine and water, one end of the spray gun 2 is inserted into the medicine tank. The three-way valve 6 is controlled to connect the delivery pump 4 to the metering chamber 51. The delivery pump 4 is started in reverse to drive the medicine in the medicine tank into the metering chamber 51. When the specified amount is reached, one end of the spray gun 2 is inserted into the clear water tank. The three-way valve 6 is controlled to connect the delivery pump 4 to the storage chamber 11. The delivery pump 4 is started in reverse to drive the clear water in the clear water tank into the storage chamber 11. When the commanded amount is reached, the micro linear motor 531 is controlled to drive the push plate 532 to slide and squeeze the medicine in the metering chamber 51, so that the medicine enters the storage chamber 11 through the one-way valve 52 to complete the mixing and preparation. The entire replenishment process does not require lowering the storage tank 1, reducing the number of steps for operators. The end of the spray gun 2 is equipped with nozzles for both water spraying and mist spraying modes, which can be switched freely. When replenishing medicine and water, the water spray nozzle is switched to improve efficiency, and when spraying, the mist spray nozzle is switched to improve the spraying effect.

[0036] Based on the same inventive concept, embodiments of the present invention provide an application method for a backpack sprayer.

[0037] A method for applying a backpack sprayer includes the following steps: S10: Insert one end of the spray gun 2 into the preset liquid tank and, in response to the replenishment signal, obtain the required amount of medicine, the required amount of water, and equipment data.

[0038] The replenishment signal is the instruction signal used to start the sprayer's quantitative extraction of medicine; the replenishment signal is automatically generated and sent by the system when the operator manually presses the replenishment button on the handle of spray gun 2.

[0039] The required dosage refers to the volume of pesticide solution to be mixed and prepared in the storage tank 1 according to the target of the spraying operation. The operator inputs the target dosage of pesticide solution, i.e. the required dosage, through the control panel on the handle of the spray gun 2, and obtains it directly from the system when in use.

[0040] The required water volume refers to the volume of clean water to be mixed and prepared in the storage tank 1 according to the target of the spraying operation. The operator inputs the target clean water usage, i.e. the required water volume, through the control panel on the handle of the spray gun 2, and obtains it directly from the system when in use.

[0041] Equipment data refers to the inherent parameters of the sprayer itself, including the volume of the metering chamber 51, the suction efficiency of the delivery pump 4, the material of the chamber wall, the size of the spray gun 2, etc. The equipment data is pre-stored in the system's database before the equipment leaves the factory, and can be retrieved directly from the database when in use.

[0042] The pesticide tank is a container used to store pure pesticide solution to be pumped out, and it contains the same type of pesticide solution required for this spraying operation.

[0043] S11: Determine the actual amount of drug needed in the quantitative storage bin 51 by combining equipment data and required drug quantity.

[0044] The quantitative dosage refers to the volume of liquid medicine that needs to be reached in the quantitative chamber 51 when the liquid medicine is drawn. The amount of residual liquid medicine inside the spray gun 2 is calculated from the size of the spray gun 2 in the equipment data. The quantitative dosage is calculated by subtracting the required amount of liquid medicine from the amount of residual liquid medicine.

[0045] Since some of the liquid will remain in the spray gun 2 after aspiration, this portion of the liquid will directly enter the storage chamber 11 in subsequent steps. Therefore, the actual amount of liquid required in the metering chamber 51 during aspiration can be reduced accordingly.

[0046] S12: Match the refill parameters of the delivery pump 4 to reverse according to the required amount of medicine.

[0047] The replenishment parameters refer to the operating parameters used to control the reverse suction of the medicine by the delivery pump 4 during the replenishment process. These parameters include the reverse rotation speed of the delivery pump 4, the nozzle switching mode of the spray gun 2, and the switching mode of the three-way valve 6. The larger the required amount of medicine, the larger the reverse rotation speed in the replenishment parameters. The corresponding reverse rotation speed is found from the speed correspondence table according to the required amount of medicine. The speed correspondence table is a data table that records different required amounts of medicine and their corresponding reverse rotation speeds. It is obtained by technicians through prior testing and recording. At this time, the nozzle switching mode is directly set to switch to the water spray nozzle to increase the replenishment rate. The water spray nozzle has a removable filter screen 13 at the end. At this time, the switching mode of the three-way valve 6 is directly set to connect the delivery pump 4 to the metering chamber 51.

[0048] S13: Control the three-way valve 6 to connect the delivery pump 4 to the metering chamber 51, control the operation of the delivery pump 4 based on the replenishment parameters and collect the actual amount of medicine in the metering chamber 51 until the actual amount of medicine is consistent with the metered amount of medicine, then control the delivery pump 4 to stop.

[0049] The actual amount of medicine refers to the actual volume of medicine liquid stored in the quantitative chamber 51 during the replenishment process. The actual amount of medicine is calculated by collecting the liquid level height data through the liquid level sensor that is pre-set in the quantitative chamber 51 and combining it with the cross-sectional area of ​​the quantitative chamber 51 in the equipment data. The upper and lower inner diameters of the quantitative chamber 51 are kept consistent.

[0050] If the actual dosage is consistent with the quantitative dosage, it means that the volume of liquid medicine in the quantitative chamber 51 has reached the set quantitative dosage, and the delivery pump 4 can stop running.

[0051] The system sends an electromagnetic signal to adjust the three-way valve 6, controlling the valve core of the three-way valve 6 to connect the delivery pump 4 with the metering chamber 51. Then, based on the reverse rotation speed, the delivery pump 4 is controlled to run, and the nozzle is switched to a water spray nozzle. The medicine enters from the water spray nozzle and enters the metering chamber 51 through the delivery pump 4 and the three-way valve 6. When the volume of medicine in the metering chamber 51 reaches the set metered amount, the delivery pump 4 is controlled to stop running.

[0052] S14: Match and control the delivery parameters of the delivery pump 4 for circulating delivery and control the airflow parameters of the preset blowing equipment according to the required amount of medicine and water.

[0053] The delivery parameters refer to the operating parameters that control the delivery pump 4 to drive the circulation of the mixed liquid, including the forward rotation speed of the delivery pump 4, the nozzle switching mode of the spray gun 2, and the switching mode of the three-way valve 6. The total demand is calculated by summing the required amount of medicine and the required amount of water. The larger the total demand, the faster the forward rotation speed. The corresponding forward rotation speed is found from the speed correspondence table based on the total demand. The speed correspondence table records data of different total demands and their corresponding forward rotation speeds, which are obtained by technicians through prior testing. At this time, the nozzle switching mode is directly set to switch to the water spray nozzle to increase the circulation rate of the mixed liquid, thereby improving the mixing rate and mixing effect. At this time, the switching mode of the three-way valve 6 is directly set to connect the delivery pump 4 to the storage chamber 11.

[0054] An air blowing device is a device that provides airflow power for a sprayer. It can use a miniature air pump and can output airflow at different pressures.

[0055] Airflow parameters refer to the parameters that control the output airflow of the blowing equipment, including airflow pressure. The larger the total demand, the greater the airflow pressure. The corresponding airflow pressure is found from the pressure correspondence table based on the total demand. The pressure correspondence table is a data table that records different total demands and their corresponding airflow pressures, which is obtained by technicians through pre-testing and recording.

[0056] S15: Based on the required water volume, water is injected into the storage chamber 11, and the piston structure 53 is controlled to inject the liquid medicine in the metering chamber 51 into the storage chamber 11 to form a mixture. One end of the spray gun 2 is inserted into the storage chamber 11.

[0057] Water is injected into the storage chamber 11 according to the required water volume. The liquid volume in the storage chamber 11 is observed through the observation window 14 on one side of the storage tank 1 until the liquid level is level with the scale corresponding to the required water volume on the liquid volume scale 15. One end of the spray gun 2 is inserted into the storage chamber 11, and the micro linear motor 531 is started to drive the push plate 532 to squeeze the medicine in the metering chamber 51. The medicine completely enters the storage chamber 11 from the one-way valve 52 and mixes with the clean water to form a mixed liquid. Then, one end of the spray gun 2 is inserted into the storage chamber 11.

[0058] S16: In response to the insertion of the mixing signal, control the three-way valve 6 to connect the delivery pump 4 with the liquid storage chamber 11, control the delivery pump 4 to circulate the mixed liquid based on the delivery parameters, and control the blowing device to output low-pressure airflow based on the airflow parameters. The low-pressure airflow passes through the preset reversing valve and is ejected from the preset annular air outlet at the end of the spray gun 2 and enters the liquid storage chamber 11.

[0059] The insertion mixing signal is a signal used to start the mixing process when the spray gun 2 is inserted into the mixing chamber 11; the insertion mixing signal is automatically generated and sent by the system when the operator manually presses the insertion mixing button on the handle of the spray gun 2.

[0060] The reversing valve is used to switch the airflow delivery path. It adopts a two-position three-way valve 6, which can control the airflow to be sprayed out from the annular air outlet or enter the liquid storage chamber 11. The valve core switching position is controlled by the electromagnetic signal sent by the system.

[0061] The annular air outlet is formed by multiple guide brackets surrounding the nozzle of the spray gun 2 and the outer wall of the spray gun 2. The guide brackets can be adjusted to the angle between themselves and the outer wall of the spray gun 2. An elastic guide membrane is provided between the guide brackets. The elastic guide membrane can deform when the angle of the guide brackets is adjusted. The annular air outlet can output airflow to form an air curtain, which is used to constrain the trajectory of droplets or disturb the mixture when mixing the medicine during spraying operations.

[0062] While the system sends the insertion mixing signal, it also sends an electromagnetic signal to adjust the three-way valve 6, controlling the valve core of the three-way valve 6 to connect the delivery pump 4 with the liquid storage chamber 11. Then, based on the forward rotation speed in the delivery parameters, the system controls the operation of the delivery pump 4, and based on the air pressure in the airflow parameters, the system controls the operation of the air blowing device. The mixed liquid in the liquid storage chamber 11 passes through the three-way valve 6 and the delivery pump 4 and is sprayed from the nozzle of the spray gun 2 into the liquid storage chamber 11 to complete the circulation. At the same time, the low-pressure airflow in the air blowing device is sprayed out from the annular air outlet to disturb the mixed liquid and make the mixed liquid evenly mixed.

[0063] S17: Orient the spray gun 2 toward the area to be sprayed, and in response to the execution signal, obtain the spraying parameters.

[0064] An execution signal is a command signal used to start the spraying operation of the sprayer; the system automatically generates and sends an execution signal when the operator manually presses the spray button on the handle of the spray gun 2.

[0065] Spraying parameters refer to the parameters set to achieve precise spraying, including spraying mode, operating speed, and the status of the three-way valve. Operators manually input these parameters in advance through the control panel according to the needs of the spraying operation, and can directly retrieve them when needed.

[0066] S18: Control the operation of the three-way valve 6, the delivery pump 4 and the spray gun 2 based on the spraying parameters to spray the mixture from the spray gun 2.

[0067] The three-way valve 6 is switched based on its state control, so that the liquid storage chamber 11 is connected to the delivery pump 4. The nozzle of the spray gun 2 is switched based on the spraying mode control. The delivery pump 4 is controlled to run in the forward direction based on the operating speed control. The mixed liquid in the liquid storage chamber 11 passes through the three-way valve 6 and the delivery pump 4 and is sprayed out from the nozzle of the spray gun 2 to start the spraying operation.

[0068] After the actual dosage matches the quantitative dosage and the delivery pump 4 is stopped, the following steps are also included: S20: Match the water replenishment parameters of the control pump 4 to reverse according to the required water volume, and insert one end of the spray gun 2 into the preset clear water tank.

[0069] The water replenishment parameters refer to the operating parameters used to control the reverse rotation of the delivery pump 4 to draw clean water, including the reverse rotation speed of the delivery pump 4, the nozzle switching mode of the spray gun 2, and the switching mode of the three-way valve 6. The larger the water demand, the faster the reverse rotation speed. The corresponding reverse rotation speed is found from the speed correspondence table according to the water demand. The speed correspondence table records data tables of different water demand and their corresponding reverse rotation speeds, which are obtained by technicians through prior testing. At this time, the nozzle switching mode is directly set to switch to the water spray nozzle to improve the water replenishment efficiency. At this time, the switching mode of the three-way valve 6 is directly set to connect the delivery pump 4 to the liquid storage chamber 11.

[0070] A clear water tank is a special water storage container used to store clear water.

[0071] To facilitate medication and water replenishment, after the quantitative medication is replenished, water is also added to the storage chamber 11 by suction using the nozzle. The entire replenishment process does not require lowering the storage tank 1; the nozzle of the spray gun 2 needs to be inserted into the clear water pool.

[0072] S21: In response to the suction and water replenishment signal, control the three-way valve 6 to connect the delivery pump 4 to the liquid storage chamber 11, control the delivery pump 4 to run in reverse based on the water replenishment parameters and collect the actual liquid volume in the liquid storage chamber 11 until the actual liquid volume is consistent with the required water volume, then control the delivery pump 4 to stop.

[0073] The suction water replenishment signal is a signal used to start the clean water replenishment process when the spray gun 2 is inserted into the clean water tank. The system automatically generates and sends the suction water replenishment signal when the operator manually presses the suction button on the handle of the spray gun 2.

[0074] The actual liquid volume refers to the volume of clear water or mixed liquid actually stored in the storage chamber 11. The actual amount of medicine is calculated by collecting the liquid level height data through a liquid level sensor that is pre-installed in the storage chamber 11 and combining it with the cross-sectional area of ​​the storage chamber 11 in the equipment data. The upper and lower inner diameters of the storage chamber 11 are kept consistent.

[0075] If the actual liquid volume matches the required water volume, it means that the volume of the medicine in the storage chamber 11 has reached the set required water volume, and the delivery pump 4 can stop running.

[0076] While sending a water suction and replenishment signal, the system also sends an electromagnetic signal to regulate the three-way valve 6, which controls the three-way valve 6 to connect the delivery pump 4 to the storage chamber 11. Based on the reverse rotation speed in the water replenishment parameters, the system controls the delivery pump 4 to run, collects the actual liquid volume in the storage chamber 11, and stops the delivery pump 4 when the actual liquid volume matches the required water volume.

[0077] S22: Control the piston structure 53 to inject the liquid medicine in the metering chamber 51 into the storage chamber 11 to form a mixture.

[0078] The micro linear motor 531 is activated to drive the pusher plate 532 to squeeze the liquid medicine in the metering chamber 51. The liquid medicine completely enters the storage chamber 11 from the one-way valve 52 and mixes with the water to form a mixture.

[0079] S23: Based on the airflow parameters, the blowing device outputs low-pressure airflow, which is ejected from the liquid storage chamber 11 through a preset reversing valve.

[0080] During this process, after the micro linear motor 531 runs, the system sends an electromagnetic signal to adjust the reversing valve, controlling the valve core of the reversing valve to connect the air blowing device with the liquid storage chamber 11. Based on the air pressure in the airflow parameters, the air blowing device is controlled to run. Low-pressure airflow passes through the reversing valve and is ejected from inside the liquid storage chamber 11 to form dense bubbles, thereby agitating the mixture.

[0081] Controlling the operation of delivery pump 4 based on spraying parameters includes the following steps: S30: Obtain the spraying mode and spraying intensity from the spraying parameters. The spraying modes include water spraying and mist spraying.

[0082] Spraying mode refers to the operating mode of the sprayer, including spray mode and water spray mode; the spraying mode is obtained directly from the spraying parameters.

[0083] Spray intensity refers to a parameter characterizing the liquid output capacity of a sprayer. In spray mode, it is the droplet size range, and in water spray mode, it is the water flow pressure threshold. The spray mode can be obtained directly from the spray parameters.

[0084] S31: Match the opening angle of the annular air outlet and the basic blowing intensity according to the spraying pattern.

[0085] The opening and closing angle refers to the angle between the air guide bracket of the annular air outlet and the outer wall of the spray gun 2, which is used to control the spray direction and coverage of the airflow. The diffusion range of the liquid is read according to different spraying modes. The diffusion range of the spray mode is much larger than that of the water spray mode. The opening and closing angle is retrieved from the basic correspondence table according to the diffusion range. The basic correspondence table is a data table that records different diffusion ranges and their corresponding opening and closing angles, which is obtained by technicians through pre-testing and recording.

[0086] Basic air blowing intensity refers to the basic air blowing intensity during spraying operations under standard working conditions. The basic air blowing intensity of water spray mode is much greater than that of mist spray mode. Operators pre-set the basic air blowing intensity corresponding to different spraying modes according to the basic parameters of the equipment and enter it into the system. When using the system, the basic air blowing intensity is directly read according to the obtained spraying mode.

[0087] S32: Determine the blowing intensity based on the spraying intensity and the basic blowing intensity.

[0088] The blowing intensity refers to the output airflow pressure value of the blowing equipment after the spray intensity has been calibrated. The corresponding intensity correction coefficient is found from the correction correspondence table based on the spray intensity. The correction correspondence table is a data table that records different spray intensities and their corresponding intensity correction coefficients. It is obtained by technicians through pre-testing and recording. The blowing intensity is calculated by multiplying the basic blowing intensity with the intensity correction coefficient.

[0089] S33: Based on the spray mode, collect data on the impact of external airflow on the front end of the spray gun 2.

[0090] Impact data refers to the relevant data of the front end of the spray gun 2 being blown by the external airflow in spray mode, including wind direction parameters and wind speed parameters; the wind direction parameters and wind speed parameters are collected and transmitted in real time by a miniature wind speed and direction sensor pre-installed at the end of the spray gun 2, and the impact data is integrated.

[0091] S34: Correct the opening and closing angle and blowing intensity based on the impact data.

[0092] Because the droplets produced by the spray mode have a low quality, they are easily affected by the external airflow. Therefore, the opening and closing angle and blowing intensity are corrected based on the collected influence data to reduce interference. The specific correction method will be disclosed in detail in subsequent steps and will not be elaborated here.

[0093] S35: Integrates the opening angle and blowing intensity to obtain and execute the blowing assistance command.

[0094] The air blowing auxiliary command refers to the execution command used to control the deflection of the guide vanes of the annular air outlet and the pressure regulation of the air blowing equipment; the air blowing auxiliary command is obtained by integrating the final opening and closing angle and the air blowing intensity.

[0095] Execute the blowing assistance command to output airflow through the annular air outlet to form an air curtain.

[0096] The method for correcting the opening angle and blowing intensity includes the following steps: S40: Read wind direction and wind speed parameters from the impact data.

[0097] Wind direction parameter refers to the flow direction data of the external airflow, which represents the orientation of the external wind relative to the spray direction of spray gun 2; the wind direction parameter is obtained directly from the influence data.

[0098] Wind speed parameters refer to the flow velocity data of external airflow, which characterizes the strength of the external wind; wind speed parameters are obtained directly from the impact data.

[0099] S41: Determine the wind direction angle corresponding to the preset air outlet number by using wind direction parameters.

[0100] The air outlet number is a unique identifier assigned to each section of the air guide bracket of the annular air outlet, used to distinguish air outlet sections in different directions. Before the equipment leaves the factory, each section of the annular air outlet is numbered sequentially in a clockwise or counterclockwise direction and stored in the system in advance. When in use, the air outlet number is read directly.

[0101] The wind direction angle refers to the angle between the external wind direction and the spray direction corresponding to each vent number; the wind direction angle corresponding to each vent number is calculated through geometric operations based on the wind direction parameters and the spray direction corresponding to the vent number.

[0102] S42: Match the wind direction angle coefficient and wind direction intensity coefficient according to the wind direction angle, and match the wind speed correction coefficient according to the wind speed parameter.

[0103] The wind direction angle coefficient is a proportional coefficient used to correct the opening and closing angle of the annular air outlet. Its value is positively correlated with the wind direction angle. The corresponding wind direction angle coefficient is retrieved from the correction correspondence table based on the wind direction angle. The correction correspondence table records data on different wind direction angles and their corresponding wind direction angle coefficients, which are obtained by technicians through prior testing.

[0104] The wind direction intensity coefficient is a proportional coefficient used to correct the blowing intensity, and its value is positively correlated with the wind direction angle. The corresponding wind direction intensity coefficient is retrieved from the correction correspondence table according to the wind direction angle. The correction correspondence table records data on different wind direction angles and their corresponding wind direction intensity coefficients, which are obtained by technicians through prior testing.

[0105] The wind speed correction factor is a proportional coefficient used to correct the opening angle and blowing intensity. Its value is positively correlated with the wind speed. The corresponding wind speed correction factor can be found from the correction correspondence table according to the wind speed parameters. The correction correspondence table records data tables of different wind speed parameters and their corresponding wind speed correction factors, which are obtained by technicians through prior testing.

[0106] S43: Based on different vent numbers and corresponding wind direction angles, the opening and closing angles and blowing intensity are corrected by combining wind direction angle coefficient, wind direction intensity coefficient and wind speed correction coefficient.

[0107] Based on different vent numbers and corresponding wind direction angles, the opening and closing angles and blowing intensity are corrected by combining wind direction angle coefficient, wind direction intensity coefficient and wind speed correction coefficient. The specific correction method will be disclosed in detail in subsequent steps and will not be elaborated here.

[0108] The method for correcting the opening angle and blowing intensity also includes the following steps: S50: The wind outlet numbers are divided into no-impact numbers, headwind numbers, and tailwind numbers based on the wind direction angle.

[0109] The "no-impact" number refers to the air outlet number corresponding to a wind direction angle of no more than 30 degrees or no less than 330 degrees. The air outlet in this area is minimally affected by external wind interference. The control system selects air outlet numbers that meet the angle range based on the calculated wind direction angle, which are the "no-impact" numbers.

[0110] The headwind number refers to the number of the wind outlet within the range of 90 degrees to 270 degrees. The air outlet in this area faces the outside wind and is the core area for anti-drift control. The control system selects the wind outlet numbers that meet the angle range based on the calculated wind direction angle, which are the headwind numbers.

[0111] The downwind number refers to the number of the air outlet within the range of 30 degrees to 90 degrees or 270 degrees to 330 degrees. The air outlet in this area faces the same direction as the outside wind. The control system selects the air outlet numbers that meet the angle range based on the calculated wind direction angle, which are the downwind numbers.

[0112] S51: Based on the unaffected numbering, no correction is required for the opening angle and blowing intensity.

[0113] For areas corresponding to the unaffected number, since the influence of external wind is minimal, the opening and closing angle and blowing intensity do not need to be corrected.

[0114] S52: Based on the headwind number, the corrected opening and closing angle is calculated by multiplying the opening and closing angle, the wind direction angle coefficient, and the wind speed correction coefficient. The corrected blowing intensity is calculated by multiplying the blowing intensity, the wind direction intensity coefficient, and the wind speed correction coefficient.

[0115] For the area corresponding to the headwind number, the corrected opening angle is calculated by multiplying the opening angle, wind direction angle coefficient, and wind speed correction coefficient. The corrected blowing intensity is calculated by multiplying the blowing intensity, wind direction intensity coefficient, and wind speed correction coefficient.

[0116] S53: Based on the downwind number, calculate the corrected opening and closing angle by quotienting the opening and closing angle with the wind speed correction coefficient, and calculate the corrected blowing intensity by quotienting the blowing intensity with the wind speed correction coefficient.

[0117] For the area corresponding to the downwind number, the corrected opening and closing angle is calculated by quotienting the opening and closing angle with the wind speed correction coefficient, and the corrected blowing intensity is calculated by quotienting the blowing intensity with the wind speed correction coefficient.

[0118] It also includes the following steps: S60: Insert one end of the spray gun 2 into the preset clean water tank and read the liquid storage data from the equipment data in response to the cleaning pumping signal.

[0119] The cleaning and pumping signal is a command signal used to start the self-cleaning process of the sprayer to draw clean water. When the operator manually presses the self-cleaning button on the handle of the spray gun 2, the system automatically generates and sends the cleaning and pumping signal, at which time one end of the spray gun 2 is inserted into the clean water tank.

[0120] Liquid storage data refers to parameters related to the liquid storage chamber 11, including the maximum volume of the liquid storage chamber 11 and the material of the chamber wall, etc.; the liquid storage data is obtained directly from the equipment data.

[0121] S61: Determine the cleaning parameters, cleaning volume, and corresponding suction parameters based on the liquid storage data.

[0122] The cleaning parameters refer to the operating parameters used to control the forward rotation output of the cleaning water flow of the transfer pump 4, including the forward rotation speed of the transfer pump 4; the cavity wall material is read from the liquid storage data. The harder the cavity wall material, the faster the forward rotation speed. The corresponding forward rotation speed is found from the speed correspondence table according to the cavity wall material. The speed correspondence table records the data table of different cavity wall materials and their corresponding forward rotation speeds, which are obtained by the technicians through prior testing.

[0123] The cleaning water volume refers to the volume of clean water required to complete the self-cleaning of the storage chamber 11. The maximum volume is read from the storage data. The larger the maximum volume, the more cleaning water is required. The corresponding cleaning water volume is retrieved from the water volume correspondence table based on the maximum volume. The water volume correspondence table is a data table that records different maximum volumes and their corresponding cleaning water volumes. It is obtained by technicians through prior testing and recording.

[0124] The suction parameters refer to the operating parameters used to control the reverse rotation of the transfer pump 4 to pump clean water, including the reverse rotation speed of the transfer pump 4. The larger the maximum volume, the faster the reverse rotation speed. The corresponding cleaning water volume is found from the speed correspondence table based on the maximum volume. The speed correspondence table records data on different maximum volumes and their corresponding cleaning water volumes, which are obtained by technicians through prior testing.

[0125] S62: Control the three-way valve 6 to connect the delivery pump 4 to the liquid storage chamber 11, control the delivery pump 4 to run in reverse based on the suction parameters and collect the actual liquid volume in the liquid storage chamber 11 until the actual liquid volume is consistent with the cleaning water volume, then control the delivery pump 4 to stop.

[0126] The actual liquid volume is consistent with the cleaning water volume, which means that the volume of clean water in the storage chamber 11 has reached the set cleaning water volume, and the delivery pump 4 can stop pumping clean water.

[0127] While sending the cleaning and pumping signal, the system also sends an electromagnetic signal to regulate the three-way valve 6. The valve core of the three-way valve 6 connects the delivery pump 4 with the storage chamber 11. Based on the reverse rotation speed in the suction parameters, the system controls the delivery pump 4 to run, so that the clean water in the clean water tank enters the storage chamber 11. At the same time, the system collects the actual liquid volume in the storage chamber 11 until the actual liquid volume matches the cleaning water volume, then controls the delivery pump 4 to stop running.

[0128] S63: Insert one end of the spray gun 2 into the liquid storage chamber 11, and in response to the cleaning water spray signal, control the delivery pump 4 to run in the forward direction based on the cleaning parameters to drive the water flow from the spray gun 2 to clean the inner wall of the liquid storage chamber 11.

[0129] The cleaning spray signal is a command signal used to start the delivery pump 4 to output cleaning water flow and rinse the inner wall of the storage chamber 11. It is automatically generated and sent by the system when the operator inserts the spray gun 2 into the storage chamber 11 and manually presses the rinsing button on the handle of the spray gun 2.

[0130] S64: After cleaning, point the spray gun 2 outward and spray water to drain the cleaning wastewater.

[0131] After cleaning the inner wall of the storage chamber 11, the operator removes the spray gun 2 from the storage chamber 11 and faces it outwards, while the delivery pump 4 continues to run to drain the cleaning wastewater from the storage chamber 11.

[0132] The following steps are also included in response to the cleaning water spray signal: S70: Determine the jetting parameters based on the liquid storage data.

[0133] The jet parameters refer to the parameters used to control the output airflow of the blowing device for drying the liquid storage chamber 11, including airflow pressure and jet duration. The larger the maximum volume, the greater the airflow pressure and jet duration. The corresponding airflow pressure and jet duration are found from the jet correspondence table based on the maximum volume. The jet correspondence table is a data table that records different maximum volumes and their corresponding airflow pressure and jet duration, which is obtained by technicians through pre-testing and recording.

[0134] S71: Based on the jet parameters, the blowing device outputs a low-pressure airflow. The low-pressure airflow passes through the reversing valve and is ejected from the annular air outlet at the end of the spray gun 2 and enters the liquid storage chamber 11.

[0135] While the system sends a cleaning spray signal, it also sends an electromagnetic signal to adjust the reversing valve. The valve core of the reversing valve is controlled to connect the air blowing device with the annular air outlet. Based on the airflow pressure in the jet parameters, the air blowing device outputs a low-pressure airflow. The low-pressure airflow follows the water flow from the annular air outlet to assist in cleaning the inner wall of the liquid storage chamber 11.

[0136] S72: Collect the actual liquid volume in the storage chamber 11.

[0137] S73: When the actual liquid volume is not greater than the preset empty liquid volume, control the reversing valve to make the low-pressure airflow output by the air blowing equipment directly spray out from the liquid storage chamber 11.

[0138] The liquid discharge volume refers to the residual liquid volume threshold used to determine whether the liquid storage chamber 11 has been drained; it is preset by the operator and entered into the system, and is usually less than 1% of the volume of the liquid storage chamber 11.

[0139] If the actual liquid volume is not greater than the drained liquid volume, it means that the residual liquid volume in the liquid storage chamber 11 has been drained by the spray gun 2 to below the drained liquid volume, and the airflow drying process can be started.

[0140] When the actual liquid volume matches the emptied liquid volume, an electromagnetic signal is sent to adjust the reversing valve. The valve core of the reversing valve is controlled to connect the air blowing device with the liquid storage chamber 11. The air blowing device is controlled to operate based on the airflow pressure in the jet parameters. Low-pressure airflow is continuously blown into the liquid storage chamber 11 to dry the residual water until the jet duration is reached and then the operation stops, thus completing the drying process.

[0141] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A backpack sprayer, comprising a reservoir (1) having a storage chamber (11) for containing liquid medicine, a spray gun (2) for atomizing and spraying the liquid medicine in the reservoir (1), and a backpack assembly (3) having shoulder straps (32) for carrying on the back, characterized in that, The storage tank (1) is equipped with a delivery pump (4) for providing bidirectional flow power for drug delivery, a metering component (5) with a metering chamber (51) for metering the drug entering through the spray gun (2), and a three-way valve (6) for connecting the delivery pump (4), the metering chamber (51) and the storage chamber (11). The metering component (5) includes a one-way valve (52) for supplying liquid medicine from the metering chamber (51) into the storage chamber (11) in a one-way direction, and a piston structure (53) for pushing the liquid medicine in the metering chamber (51) out of the one-way valve (52).

2. A backpack sprayer according to claim 1, characterized in that, The shoulder strap (32) is fixedly installed on one side of the liquid storage tank (1), and the back support assembly (3) also includes a ventilated back panel (31) for conforming to the back of the human body. The ventilated back panel (31) is detachably installed on the side of the liquid storage tank (1) near the shoulder strap (32). The ventilation back panel (31) is provided with a raised buffer block (311) on the side away from the liquid storage tank (1) to increase friction and form a ventilation gap when it fits against the back of the human body.

3. A backpack sprayer according to claim 1, characterized in that, The carrying assembly (3) also includes a lumbar support (33) for lumbar support, which is detachably mounted on the side of the reservoir (1) near the shoulder strap (32).

4. A method for applying a backpack sprayer, used with a backpack sprayer as described in any one of claims 1 to 3, characterized in that, include: S10: Insert one end of the spray gun (2) into the preset liquid tank and, in response to the replenishment signal, obtain the required amount of medicine, the required amount of water, and the equipment data; S11: Determine the actual amount of drug needed in the quantitative storage bin (51) by combining equipment data and required drug quantity; S12: Match the reversal parameters of the delivery pump (4) according to the required amount of medicine; S13: Control the three-way valve (6) to connect the delivery pump (4) to the quantitative bin (51), control the delivery pump (4) to run based on the replenishment parameters and collect the actual amount of medicine in the quantitative bin (51) until the actual amount of medicine is consistent with the quantitative amount of medicine, then control the delivery pump (4) to stop. S14: Match the delivery parameters of the delivery pump (4) to the required amount of medicine and water, and control the airflow parameters of the preset blowing equipment according to the required amount of medicine and water. S15: Based on the required water volume, inject water into the storage chamber (11) and control the piston structure (53) to inject the liquid in the metering chamber (51) into the storage chamber (11) to form a mixture. Insert one end of the spray gun (2) into the storage chamber (11). S16: In response to the insertion of the mixing signal, control the three-way valve (6) to connect the delivery pump (4) with the liquid storage chamber (11), control the delivery pump (4) to circulate the mixed liquid based on the delivery parameters, and control the blowing device to output low-pressure airflow based on the airflow parameters. The low-pressure airflow passes through the preset reversing valve and is sprayed out from the annular air outlet preset at the end of the spray gun (2) and enters the liquid storage chamber (11). S17: Orient the spray gun (2) toward the area to be sprayed, and in response to the execution signal, obtain the spraying parameters; S18: Control the operation of the three-way valve (6), the delivery pump (4) and the spray gun (2) based on the spraying parameters to spray the mixture from the spray gun (2).

5. The application method of a backpack sprayer according to claim 4, characterized in that, The actual dosage is consistent with the quantitative dosage and the delivery pump is controlled. (4) After the machine is stopped, the following is also included: S20: Match the water supply parameters of the control pump (4) to reverse according to the required water volume, and insert one end of the spray gun (2) into the preset clear water pool; S21: In response to the suction water replenishment signal, control the three-way valve (6) to connect the delivery pump (4) with the storage chamber (11), control the delivery pump (4) to run in reverse based on the water replenishment parameters and collect the actual liquid volume in the storage chamber (11) until the actual liquid volume is consistent with the required water volume, and control the delivery pump (4) to stop. S22: Control the piston structure (53) to inject the liquid medicine in the metering chamber (51) into the storage chamber (11) to form a mixture; S23: Based on the airflow parameters, the blowing device outputs low-pressure airflow, and the low-pressure airflow is ejected from the inside of the liquid storage chamber (11) through the preset reversing valve.

6. The application method of a backpack sprayer according to claim 4, characterized in that, The operation of the delivery pump (4) based on spraying parameters includes: S30: Obtain the spraying mode and spraying intensity from the spraying parameters. The spraying mode includes water spraying and mist spraying. S31: Match the opening angle of the annular air outlet and the basic blowing intensity according to the spraying pattern; S32: Determine the blowing intensity based on the spraying intensity and the basic blowing intensity; S33: Based on the spray mode, collect data on the impact of the front end of the spray gun (2) on the external airflow; S34: Correct the opening and closing angle and blowing intensity based on the impact data; S35: Integrates the opening angle and blowing intensity to obtain and execute the blowing assistance command.

7. The application method of a backpack sprayer according to claim 6, characterized in that, Methods for correcting the opening angle and blowing intensity include: S40: Read wind direction and wind speed parameters from the impact data; S41: Determine the wind direction angle corresponding to the preset air outlet number by using wind direction parameters; S42: Match the wind direction angle coefficient and wind direction intensity coefficient according to the wind direction angle, and match the wind speed correction coefficient according to the wind speed parameter; S43: Based on different vent numbers and corresponding wind direction angles, the opening and closing angles and blowing intensity are corrected by combining wind direction angle coefficient, wind direction intensity coefficient and wind speed correction coefficient.

8. The application method of a backpack sprayer according to claim 7, characterized in that, Methods for correcting the opening angle and blowing intensity also include: S50: The wind outlet numbers are divided into no-impact numbers, headwind numbers, and tailwind numbers based on the wind direction angle; S51: Based on the unaffected numbering, no correction is needed for the opening angle and blowing intensity; S52: Based on the headwind number, the corrected opening and closing angle is calculated by multiplying the opening and closing angle, the wind direction angle coefficient, and the wind speed correction coefficient. The corrected blowing intensity is calculated by multiplying the blowing intensity, the wind direction intensity coefficient, and the wind speed correction coefficient. S53: Based on the downwind number, calculate the corrected opening and closing angle by quotienting the opening and closing angle with the wind speed correction coefficient, and calculate the corrected blowing intensity by quotienting the blowing intensity with the wind speed correction coefficient.

9. The application method of a backpack sprayer according to claim 4, characterized in that, Also includes: S60: Insert one end of the spray gun (2) into the preset clean water tank, and read the liquid storage data from the equipment data in response to the cleaning pumping signal; S61: Determine the cleaning parameters, cleaning volume, and corresponding suction parameters based on the liquid storage data; S62: Control the three-way valve (6) to connect the delivery pump (4) to the storage chamber (11), control the delivery pump (4) to run in reverse based on the suction parameters and collect the actual liquid volume in the storage chamber (11) until the actual liquid volume is consistent with the cleaning water volume, then control the delivery pump (4) to stop. S63: Insert one end of the spray gun (2) into the liquid storage chamber (11) and, in response to the cleaning spray signal, control the delivery pump (4) to rotate forward based on the cleaning parameters to drive the water flow from the spray gun (2) to clean the inner wall of the liquid storage chamber (11); S64: After cleaning, turn the spray gun (2) outward and spray water to drain the cleaning wastewater.

10. The application method of a backpack sprayer according to claim 9, characterized in that, The response to the cleaning water spray signal also includes: S70: Determine the jetting parameters based on the liquid storage data; S71: Based on the jet parameters, the blowing device outputs low-pressure airflow. The low-pressure airflow passes through the reversing valve and is ejected from the annular air outlet at the end of the spray gun (2) and enters the liquid storage chamber (11). S72: Collect the actual liquid volume in the storage chamber (11); S73: When the actual liquid volume is not greater than the preset empty liquid volume, control the reversing valve to make the low-pressure airflow output by the air blowing equipment directly spray out from the liquid storage chamber (11).

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