Nozzle and herbicide spraying device for synchronous transplanting of rice transplanters

Abstract

The present invention discloses a nozzle comprising a housing having a channel with a front opening and a rear opening. A water column is housed within the channel, capable of sliding along the channel and circulating liquid. The rear end of the water column is connected to a water outlet mechanism, which is configured to withstand the impact of liquid flowing through the water column and to form or enlarge a gap with the rear opening, through which liquid is sprayed. The present invention also discloses a herbicide spraying device for synchronous transplanting with a rice transplanter. The present invention has the beneficial effect of depositing liquid as fine droplets at the transplanting site, making it suitable for synchronous transplanting.

Description

Technical Field

[0001] The invention relates to a nozzle and a herbicide spraying device for synchronous rice transplanting with a rice transplanter, and is mainly used in. Background Art

[0002] Weed control is crucial for ensuring rice yield and quality in my country. Weeds compete with rice for fertilizer, water, light, and space, and their roots release allelopathic substances that inhibit normal rice growth, leading to severe yield reductions or even complete crop failure. Weeds also serve as intermediate hosts for rice pests and diseases, severely impacting rice quality and endangering rice production safety. Currently, industry experts have proposed a closed weed control technology for rice fields using "simultaneous seeding and spraying." They have developed precise spray equipment and accessories and successfully selected closed herbicide products suitable for direct seeding in mechanized fields. For example, announcement number CN203984920U discloses a multifunctional agricultural equipment, including an equipment main body, rice transplanting equipment, plowing equipment, and spraying equipment. The equipment main body includes a basic transmission system and a component transmission system. The rear end of the component transmission system is provided with an output shaft a, and the output shaft a extends out of a part of the component transmission system, and its cross-section is a square with rounded corners; the rice transplanting equipment, plowing equipment, and spraying equipment all include a speed transmission assembly and a fixed frame. The front end of the speed transmission assembly is provided with an input shaft a, and the input shaft a is a hollow shaft, and the hollow cross-section shape is the same as the protruding part of the output shaft a; the utility model integrates the functions of herbicide spraying, rice transplanting, and plowing. The rice transplanting equipment, plowing equipment, and spraying equipment are all provided with docking flange plates and fixing plates corresponding to the equipment main body, which can be easily disassembled and switched, and are suitable for large-scale promotion in the agricultural field.

[0003] Although the patent proposes a technology for simultaneous transplanting and herbicide spraying, the herbicide spraying device used therein is a spray system, which has certain defects: the herbicide is sprayed through atomization and is easily suspended and diffused in the air. When encountering a certain wind force, it will drift in unpredictable directions. The herbicide output cannot be accurately sprayed at a fixed point, and its effectiveness is low; if an existing spray gun-like spraying device is used, the herbicide is sprayed in the form of a water column with a certain pressure, which is easy to cause physical damage to the seedlings, which is not conducive to the growth of the seedlings. Summary of the Invention

[0004] One of the technical problems to be solved by the present invention is to provide a nozzle which can drop liquid in the form of fine water droplets on the transplanting site, and is suitable for synchronous transplanting.

[0005] The present invention is achieved through the following technical solutions.

[0006] A nozzle includes a shell having a channel, the channel being provided with a front end opening and a rear end opening in the shell, a water column being placed in the channel and capable of sliding along the channel and used to circulate liquid, the rear end of the water column being connected to a water outlet mechanism, the water outlet mechanism being used to withstand the impact of liquid flowing through the water column and forming or enlarging a gap between the water column and the rear end opening, and the liquid being sprayed out through the gap.

[0007] The principle of the present invention is as follows: liquid (herbicide) is input into the shell through the front opening, flows through the water column and impacts the water outlet mechanism. Since the water column can slide along the channel of the shell in the direction of the channel, a gap is formed between the water outlet mechanism and the rear opening to output the liquid. The output liquid is not in an atomized state, nor is it a water column with a certain pressure sprayed out like a spray gun. The output diameter of the present invention, that is, the size of the gap, varies with the input intensity of the liquid input into the shell. Therefore, the pressure of the liquid output from the gap will not change much with the total intensity of the liquid. The output liquid falls on the transplanting site or soil in the form of small water droplets. The output accuracy and output intensity are closely matched with the characteristics of transplanting.

[0008] As a further improvement of the present invention, the water outlet mechanism includes a diverter body and a cover body that can be matched and inserted in the rear end opening. The front end and rear end of the diverter body are respectively connected to the water column and the cover body. The front end of the diverter body has at least two diversion channels, which divert the liquid flowing through the water column from the middle to the side, and the diversion channel at the front end of the diverter body diverts the liquid from the middle to the side, thereby optimizing the flow path of the liquid.

[0009] As a further improvement of the present invention, the rear end of the diverter has a fixed shaft coaxial with the cover body, the cover body is fixed on the fixed shaft, and a turntable is provided between the diverter and the cover body. The turntable can be rotatably mounted on the fixed shaft, and a plurality of guide vanes oblique to the meridian are provided on its front end surface around the circumference. The feature of the guide vanes dividing the space can average the liquid along the outer edge of the circumference of the turntable, so that the liquid sprayed from the outer edge of the circumference of the turntable is more even; since the guide vanes are oblique to the meridian, the liquid after diversion impacts the guide vanes and drives the turntable to rotate, and the liquid is sprayed out of the nozzle in a 360° rotation between adjacent guide vanes.

[0010] As a further improvement of the present invention, a positioning ring connected to the shell is provided in the channel, the water column passes through the positioning ring, the water column sleeve is provided with a compression spring and the two ends of the compression spring are respectively connected to the positioning ring and the front end of the water column. The compression spring moves toward the rear end opening with the water column and the water outlet mechanism to generate elastic force, and is balanced with the force of the liquid impacting the water outlet mechanism to control the size of the gap.

[0011] As a further improvement of the present invention, the water column and the compression spring are sleeved with a first sleeve fixed to the positioning ring and a second sleeve fixed to the front end of the water column. The first sleeve slides on or is sleeved by the second sleeve, and the sliding contact surfaces of the two are provided with multiple O-rings. The first sleeve, the second sleeve and the water column constitute a cylindrical structure with an open front end and a closed rear end, so that the compression spring is in a sealed space and will not be corroded by liquid. Due to the mutual sleeve relationship of the first sleeve and the second sleeve, the cylindrical structure can be deformed accordingly with the movement of the water column and the water outlet mechanism, and the O-ring can play a role in strengthening the sealing effect. In addition, the O-ring of the first sleeve and the O-ring of the second sleeve will generate friction. When the liquid input intensity occasionally fluctuates slightly, it is not an active increase or decrease in the liquid input intensity. Therefore, the friction generated by the O-rings of the first sleeve and the second sleeve can prevent the water column and the water outlet mechanism from displacement. Only when the liquid input intensity is actively and significantly increased or decreased will the water column and the water outlet mechanism be displaced accordingly, thereby maintaining the effect of normal spraying.

[0012] As a further improvement of the present invention, a filter barrel is provided in the channel and is sleeved outside the first sleeve and the second sleeve. The rear end of the filter barrel is open and fixed on the positioning ring. The front end cover of the filter barrel allows liquid to flow into the barrel. A plurality of impurity adsorption parts are provided on the inner wall of the filter barrel. The impurity adsorption parts can be activated carbon to adsorb solid particle impurities and most organic impurities in the liquid, purify the filtered liquid, and reduce the interference of impurities on its performance.

[0013] As a further improvement of the present invention, there is a gap between the filter barrel and the inner wall of the channel to form an annular space. A plurality of strong magnetic parts are provided in the annular space. The strong magnetic parts form magnetic lines to magnetize the liquid flowing through the water column. During the magnetization process, the impurities in the liquid can be charged to generate an electric potential, turning them into polar substances. This changes the original electrostatic attraction state of the impurities, which is beneficial to preventing the deposition of calcium, magnesium, etc. in the liquid, forming soft crystals to achieve anti-scaling effect. Combined with the impurity adsorption parts, it can better remove various impurities in the liquid.

[0014] As a further improvement of the present invention, the middle part of the front end cover of the filter barrel is a solid area, and the part between the solid area and the outer edge of the filter barrel is provided with a plurality of through holes for liquid to pass through. After the guided liquid enters the water column, it can fully contact the filter barrel, thereby enhancing the filtering effect of impurities.

[0015] As a further improvement of the present invention, the rear end face of the front end cover of the filter barrel is located in the solid area and is provided with a guide cylinder coaxial with the water column. The outer wall of the guide cylinder is provided with a spiral convex portion. The provision of the guide cylinder can further improve the contact rate between the liquid and the filter barrel. The spiral convex portion can extend the flow path of the liquid in the water column and increase the contact time with the filter barrel.

[0016] The second technical problem to be solved by the present invention is to provide a herbicide spraying device for synchronous transplanting of rice seedlings by a rice transplanter.

[0017] The present invention is achieved through the following technical solutions.

[0018] A herbicide spraying device for synchronous rice transplanting with a rice transplanter comprises a water tank containing herbicide, a water pipe, a plurality of nozzles installed in parallel on the water pipe at equal intervals, and a water pump that pumps the herbicide in the water tank to the water pipe through a pipe. The water tank is installed on the rice transplanter, the water pipe is placed horizontally below the rice transplanting channel of the rice transplanter, the nozzles are staggered with the rice transplanting channel, the maximum spraying ranges of adjacent nozzles do not overlap, and the maximum spraying ranges of the nozzles cover the rice transplanting points of adjacent rice transplanting channels.

[0019] Beneficial effects of the present invention:

[0020] (1) Compared with the prior art atomized spray that is easily diffused in the air or greatly affected by wind, and the prior art spray gun-like spray of water with a certain pressure that causes damage to the seedlings, the nozzle of the present invention sprays the liquid in the form of fine water droplets, which can avoid the above-mentioned defects;

[0021] (2) The present invention can divert the liquid from the middle to the side through the diverter and the turntable so that it can be sprayed out through the gap. The guide plate of the turntable can, on the one hand, make the liquid uniform, and on the other hand, rotate the liquid 360° in a "throwing out" manner and spray it out. The spraying effect is suitable for synchronous transplanting.

[0022] (3) The first sleeve, the second sleeve and the O-ring of the present invention not only seal the compression spring to prevent it from being corroded and affecting its performance, but also produce a friction effect to prevent the water column and the water outlet mechanism from sliding relative to each other when the liquid input intensity fluctuates slightly, thereby improving the stability of the spraying;

[0023] (4) The filter barrel of the present invention can absorb solid particle impurities and most organic impurities in the liquid, and a strong magnetic part is configured outside the filter barrel to magnetize the liquid flowing through the water column to filter out metal and other impurities, thereby having good filtering performance;

[0024] (5) The through hole, guide cylinder and spiral protrusion of the front end cover of the filter barrel of the present invention can make the liquid fully contact the filter barrel, further improving the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic cross-sectional view of the nozzle of Example 1;

[0026] Figure 2 This is a schematic diagram of the structure of the turntable in implementation case 1;

[0027] Figure 3 This is a cross-sectional view of a gap formed between the cover and the rear opening in Example 1;

[0028] Figure 4 This is a partial cross-sectional schematic diagram of the first sleeve and the second sleeve of Example 1;

[0029] Figure 5 This is a schematic diagram of the structure of a herbicide spraying device for synchronous transplanting of rice seedlings by a rice transplanter in implementation case 2;

[0030] Figure 6 This is a schematic diagram of rice plant height and weed control efficacy 15 days after the implementation of Case 3 "synchronous spraying";

[0031] Figure 7 This is a schematic diagram of the weed control effect and rice yield 35 days after the implementation of Case 3 "synchronous insertion and spraying". DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0033] Implementation Case 1:

[0034] Reference Figures 1-4 , nozzle, which includes a shell 1, the shell 1 consists of two parts, a shell front part 11 and a shell rear part 12, the shell front part 11 and the shell rear part 12 are threadedly connected, the shell 1 has a channel 2, the channel 2 is provided with a front end opening 1-A and a rear end opening 1-B in the shell 1, the channel 2 consists of a channel front part 21, a channel middle part 22 and a channel rear part 23, the channel front part 21 and the channel middle part 22 are located at the shell front part 11, and the channel rear part 23 is located at the shell rear part 12. The front portion 21 of the channel and the middle portion 22 of the channel are both cylindrical, and the diameter of the middle portion 22 of the channel is larger than that of the front portion 21 of the channel. The rear portion 23 of the channel is trumpet-shaped with a small front opening and a large rear opening, and the size of its front opening is roughly the same as the diameter of the front portion 21 of the channel. More specifically, the interior of the rear portion 12 of the shell body has a cylindrical structure 12-A that extends into the space of the front portion 11 of the shell body to form the front opening of the rear portion 23 of the channel. The cylindrical structure has a small front opening and a large rear opening, and its shape matches the trumpet shape of the rear portion 23 of the channel. The front end of the cylindrical structure is provided with a ring structure as a positioning ring 12-B, and the front end surface of the positioning ring 12-B is provided with a circle of grooves.

[0035] A filter barrel 3 is disposed in the central portion 22 of the channel. A front end cap 31 is provided at the front end of the filter barrel 3, and a rear end opening 1-B is provided. The front end cap 31 is tightly attached to the flange of the central portion 22, which protrudes from the rear end of the channel front portion 21. The rear end of the filter barrel 3 is tightly fitted over the outer ring of the positioning ring 12-B. Therefore, the filter barrel 3 is not fixed within the housing 1 and can be freely installed and removed by removing the housing front portion 11 and the housing rear portion 12. A water column 4 is disposed within the central portion 22 of the channel and within the filter barrel 3. The water column 4 can slide along the channel 2 and circulate liquid. The rear end of the water column 4 is connected to a water outlet mechanism located at the rear portion 23 of the channel. The water outlet mechanism is designed to withstand the impact of liquid flowing through the water column 4 and to form or enlarge a gap 1-c between the water column 4 and the rear end opening 1-B. Liquid flows through the rear portion 23 of the channel and is sprayed out through the gap 1-c.

[0036] The main principle of the nozzle is as follows: the liquid (herbicide) is input into the shell 1 through the front opening 1-A, and flows through the water column 4 and hits the water outlet mechanism. Since the water column 4 can slide along the channel 2 in the shell 1, the water column 4 and the water outlet mechanism move toward the rear opening 1-B, thereby forming a gap 1-c between the water outlet mechanism and the rear opening 1-B to output the liquid. The output liquid is not in an atomized state and will not be dispersed into tiny droplets or particles suspended in the air. It will not spread irregularly in the air or be blown to the direction of the wind due to the wind. The liquid does not drift in a predictable direction, nor does it directly impact the seedlings with a certain pressure sprayed from a spray gun, which may cause certain damage to the seedlings. The output diameter of the present invention, that is, the size of the gap 1-c, changes with the liquid input intensity of the input shell 1. Therefore, the pressure of the liquid output from the gap 1-c will not change much with the total intensity of the liquid. The output liquid is neither atomized nor a high-pressure water column, but falls on the transplanting site or soil in the form of small water droplets. The output accuracy and output intensity of the liquid (herbicide) are closely matched with the characteristics of transplanting.

[0037] The water outlet mechanism includes a diverter fluid 51, a cover body 52, a turntable 53, and a diverter fluid mounting part 54. The front end of the diverter fluid 51 is fixedly connected to the diverter fluid mounting part 54, and the diverter fluid mounting part 54 is fixedly connected to the rear end of the water column 4. The function of the diverter fluid mounting part 54 is to strengthen the fixing strength between the diverter fluid 51 and the water column 4, and to prevent the water column 4 from radial movement. The front end of the diverter fluid 51 has two diverter channels 51-a, which divert the liquid flowing through the water column 4 from the middle to the side. Because the nozzle of the present invention outputs liquid through the gap 1-c between the water outlet mechanism and the rear end opening 1-B, the diverter fluid 51 is set, and the middle part of the front end of the diverter fluid 51 is used to withstand the impact of the liquid flowing through the water column 4 as a power source to drive the movement of the water column 4 and the water outlet mechanism, and the diverter channel 51-a at the front end of the diverter fluid 51 diverts the liquid from the middle to the side, thereby optimizing the flow path of the liquid. The shape of the cover body 52 matches the rear end opening 1-B of the shell 1. The rear end of the diverter fluid 51 has a fixed shaft 511, and the fixed shaft 511 is coaxial with the cover body 52. The cover body 52 is fixedly mounted on the fixed shaft 511. The turntable 53 is located between the diverter 51 and the cover body 52, and can be rotatably sleeved on the fixed shaft 511. A plurality of guide vanes 531 deflected to the meridian are provided around the circumference of the front end thereof, with a deflection angle of 10-30°. The guide vanes 531 have two functions. First, the feature of the guide vanes 531 dividing the space can average the liquid along the outer edge of the circumference of the turntable 53, so that the liquid sprayed from the outer edge of the circumference of the turntable 53 is more even, avoiding excessive local output. Secondly, since the guide vanes 531 are deflected to the meridian, the liquid after diversion impacts the guide vanes 531, which drives the turntable 53 to rotate. The liquid is sprayed out of the nozzle in a 360° rotation between adjacent guide vanes 531. Compared with straight-line spraying, this spraying method is similar to "throwing out".

[0038] The front end of the water column 4 protrudes radially, and its width is roughly the same as the inner diameter of the filter barrel 3. The water column 4 is provided with a compression spring 4-a, and the front end of the compression spring 4-a is fixedly connected to the front end of the water column 4. The rear end of the compression spring 4-a extends into the groove of the positioning ring 12-B and is fixedly connected to the positioning ring 12-B. The compression spring 4-a serves as a reset component for the water column 4 and the water outlet mechanism. It generates elastic force as the water column 4 and the water outlet mechanism move toward the rear end opening 1-B, and balances the force of the liquid impacting the water outlet mechanism to control the size of the gap 1-c for spraying liquid. When the liquid input intensity of the nozzle becomes smaller, the compression spring 4-a drives the water column 4 and the water outlet mechanism to reset a certain distance to reduce the size of the gap 1-c. When the nozzle completely stops inputting liquid, it is completely reset to close the gap 1-c.

[0039] The water column 4 and the compression spring 4-a are sleeved with a first sleeve 61 fixed on the positioning ring 12-B and a second sleeve 62 fixed on the front end of the water column 4. The first sleeve 61 is slidably sleeved on the second sleeve 62, and the sliding contact surfaces of the two are provided with multiple O-rings 6-A. The first sleeve 61, the second sleeve 62 and the water column 4 constitute a cylindrical structure with an open front end 1-A and a closed rear end, so that the compression spring 4-a is in a sealed space and will not be corroded by the liquid (herbicide) and affect its performance. Due to the mutual sleeve relationship between the first sleeve 61 and the second sleeve 62, the cylindrical structure can be deformed accordingly with the movement of the water column 4 and the water outlet mechanism, and the O-ring 6-A can play a role in strengthening the sealing effect. The O-ring 6-A also has an important function. The O-ring 6-A of the first sleeve 61 and the O-ring 6-A of the second sleeve 62 will generate friction. Force, when the friction force does not exceed the maximum static sliding friction force, the first sleeve 61 and the second sleeve 62 will not be displaced relative to each other. It is worth noting that in fact, during the continuous spraying of liquid by the nozzle, the liquid input intensity will occasionally fluctuate slightly. This fluctuation is caused by objective factors (such as shaking), and is not an active increase or decrease in the liquid input intensity. In this case, if the guide column and the water outlet mechanism move, the width of the gap 1-c will increase or decrease, thereby affecting the normal liquid spraying. Therefore, the friction force generated by the O-ring 6-A of the first sleeve 61 and the second sleeve 62 can avoid the displacement of the water column 4 and the water outlet mechanism. Only when the liquid input intensity is actively and significantly increased or decreased, the water column 4 and the water outlet mechanism will be displaced accordingly. Therefore, the setting of the first sleeve 61, the second sleeve and the O-ring 6-A has the effect of maintaining normal spraying.

[0040] The inner wall of the filter barrel 3 is provided with a plurality of impurity adsorbing members 32. The impurity adsorbing members 32 can be made of activated carbon, preferably coconut shell activated carbon, which can adsorb solid particle impurities and most organic impurities in the liquid. On the one hand, it can purify the filtered liquid (herbicide) and reduce the interference of impurities on its performance. On the other hand, it can filter out solid particle impurities and avoid the problem of nozzle clogging caused by long-term siltation. The setting of the first sleeve 61, the second sleeve 62 and the O-ring 6-A can seal the overpressure spring 4-a. There is a gap between the filter barrel 3 and the inner wall of the channel 2 to form an annular space, and a plurality of strong magnetic parts 33 are provided in the annular space. The strong magnetic parts 33 are made of high coercive force permanent magnetic materials with a magnetic field strength greater than 5000 Gauss. The strong magnetic parts 33 form magnetic lines to magnetize the liquid flowing through the water column 4. During the magnetization process, the impurities in the liquid can be charged to generate an electric potential, making them polar substances. This changes the original electrostatic attraction state of the impurities, which is beneficial to preventing the deposition of calcium, magnesium, etc. in the liquid, forming soft crystals to achieve anti-scaling effect. In combination with the impurity adsorption part 32, various impurities in the liquid can be better removed.

[0041] The middle portion of the front end cover 31 of the filter barrel 3 is a solid area 31-A. The portion between the solid area 31-A and the outer edge of the filter barrel 3 is provided with a plurality of through holes 31-B for liquid to pass through. The axial direction of the through holes 31-B can be tilted from front to back toward the inner wall of the filter barrel 3. The guided liquid can fully contact the filter barrel 3 after entering the water column 4, thereby enhancing the filtration effect of impurities. The rear end face of the front end cover 31 of the filter barrel 3 is located in the solid area 31-A and is provided with a guide cylinder 34 coaxial with the water column 4. The outer wall of the guide cylinder 34 is provided with a spiral protrusion 341. The provision of the guide cylinder 34 can further increase the contact rate between the liquid and the filter barrel 3. The provision of the spiral protrusion 341 can extend the flow path of the liquid in the water column 4 and increase the contact time with the filter barrel 3. The combination of the two further improves the filtration effect.

[0042] Implementation Case 2:

[0043] Reference Figure 5 , a herbicide spraying device for synchronous transplanting of rice seedlings with a rice transplanter, comprising a water tank 101 containing herbicide, a water pipe 102, a plurality of nozzles 103 installed in parallel on the water pipe 102 at equal intervals, and a water pump 104 that pumps the herbicide in the water tank 101 to the water pipe 102 through a pipeline, the nozzle 103 being the nozzle of implementation case 1, the water tank 101 being installed on a rice transplanter 105, the water pipe 102 being horizontally placed below a rice transplanting channel 106 of the rice transplanter 105, the nozzles 103 and the rice transplanting channel 106 being staggered, the maximum spraying ranges of adjacent nozzles 103 not overlapping, and the maximum spraying ranges of the nozzles 103 covering the rice transplanting points of adjacent rice transplanting channels 106.

[0044] In this implementation, a Yanmar VP6D rice transplanter (6 rows, 30 cm row spacing, 25 cm plant spacing) was used. The nozzles were positioned 20-25 cm above the ground, with each nozzle positioned between two rows of rice (with a 30 cm spacing between nozzles) to apply pesticides, minimizing the amount of pesticide applied to each rice plant. The water pump was a 12V vacuum diaphragm pump with a pressure of 1.2-1.6 MPa. The power supply was 12V and could be connected directly to the transplanter's battery, eliminating the need for complex wiring. In this implementation, the spray volume was 0.5 L / min. -1 After installation is completed, check the air tightness and prepare to carry out the test.

[0045] Implementation Case 3:

[0046] Test points and treatment methods

[0047] Field experiments were conducted at three sites: the experimental field at the China National Rice Research Institute (Site A, E119°93′, N30°08′); Changshan Village, Fuyang City, Zhejiang Province (Site B, E119°92′, N30°09′); and Huaxing Farm, Haiyan County, Jiaxing City, Zhejiang Province (Site C, E120°87′, N30°50′). Sites A and B had sandy clay loam soils with a pH of 5.98 and an organic matter content of 3.10%, while site C had sandy clay loam soils with a pH of 7.10 and an organic matter content of 3.40%. All three sites have been used by the research team for many years for weed research. Weeds such as Echinochloa crus-galli, Cyperus dimorphus, Cyperus rotundus, Amaranthus aurantii, Polygonum sylvestris, and Polygonum hydropiper were numerous, dense, and severely damaging. All experimental fields were previously cultivated with a single-season rice crop from the previous year and were left fallow during the winter. Points A and B used the rice variety Jia 58, and the seeds were soaked on March 25, 2019. Conventional water and fertilizer management was carried out on the seedling trays. The land was leveled on April 25, and the "simultaneous transplanting and spraying" experiment was carried out on April 28. Point C used the conventional japonica rice variety Jia 67, and the seeds were soaked on May 20, 2019. The land was leveled on June 8, and the "simultaneous transplanting and spraying" experiment was carried out on June 10. The rice fields were kept moist at 0-2 cm before mechanical transplanting, and normal water, fertilizer, disease and pest management was carried out after transplanting.

[0048] The herbicides used for the "simultaneous transplanting and spraying" method are shown in Table 1. The recommended medium dose was used for all applications. Based on the efficiency of the rice transplanter, the required time per mu (approximately 8 minutes) translates to a herbicide dosage of 4 kg. Therefore, the herbicide-water ratio per mu (approximately 4 kg / 666.7 m²) was 4 kg. The application day at test sites A and B was cloudy, with a wind speed of level 2 and temperatures ranging from 16-24°C. No heavy rain occurred within seven days of application, with occasional light rain. The application day at test site C was cloudy, with a wind speed of level 3 and temperatures ranging from 20-29°C. No heavy rain occurred within seven days of application, with occasional light rain.

[0049]

[0050] Table 1. Selected herbicides and treated areas

[0051] Rice damage symptoms were visually inspected 7 and 15 days after application. Rice plant height was measured 15 days after application. Yield was determined by harvesting the entire field after full rice maturity. Weed control efficacy was visually inspected 15 and 30 days after application. Data were analyzed and processed using SAS 9.1 software. ANOVA analysis of variance was used. Different lowercase letters indicate significant differences among treatments (P < 0.05); identical lowercase letters indicate non-significant differences among treatments.

[0052] like Figure 6As shown, visual inspection of rice damage symptoms at 7 and 15 days after application revealed normal growth across all treatments at each test site, with no visible damage. Plant height was measured 15 days after application. At sites A and B, there were no statistically significant differences in plant height between treatments 1-5, indicating no growth inhibition. At site C, treatments 2 and 4 showed no significant differences from the control, while treatments 1 and 3 showed significantly higher plant heights than the control. This indicates that the tested herbicides, using the precise and uniform application method of "interpolation and spraying," had no adverse effects on rice growth.

[0053] like Figure 6 As shown, visual inspection of weed control in the paddy fields 15 days after application showed effective weed control compared to the control (T5) treatment. Total weed control efficacy during T1-T4 was 97.7% or higher, demonstrating excellent control effectiveness. Only a few isolated Echinochloa crusgalli (Barnyardgrass) were observed at sites A, B, and C, while Echinochloa crusgalli and Dalbergia sylvestris (Germanys sylvestris) were abundant in the control paddy fields.

[0054]

[0055] like Figure 7 As shown, visual inspection of weed control in paddy fields 35 days after application showed effective weed control compared to the control treatment, with total weed control efficacy exceeding 95.0% in T1-T4. At sites A and B, only isolated Echinochloa crusgalli (Barnyardgrass) was observed during T1-T4. At site C, only isolated Echinochloa crusgalli (Barnyardgrass) and Water Marten (Water Marten) were observed during T1-T4. In the control (T5) paddy field, Echinochloa crusgalli (Barnyardgrass), Dalbergia vaginalis (Dalbergia vaginalis), Cyperus rotundus (Sedge), and Water Marten were abundant.

[0056] For machine-transplanted rice, rows were closed approximately 40 days after pesticide application, ensuring optimal rice growth. Weed growth was suppressed, and even if weeds did occur, they would not affect later rice growth and yield formation. Rice yield was measured at full maturity. Field-wide yield measurements showed that each test site was affected differently by natural weeds. Site C, the control (T5) treatment, was the most severely affected, with a yield of only 240 kg / 667 m². 2 Compared to the average yield of T1-T4, the yield loss was as high as 42.7%. Site B had the lowest yield loss, reaching 12.5%. Site A had a yield loss somewhere between sites B and C. There were no significant differences among the four herbicides used. For example, T3 had the highest yield at sites A and B, but the lowest at site C. Conversely, T4 had the lowest yield at site A but the highest at site C. Therefore, field trials of rice yield are subject to numerous environmental influences, making it difficult to determine the relative merits of individual herbicide products.

[0057]

[0058] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand and implement the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A nozzle, characterized in that: The invention comprises a shell, wherein the shell has a channel, the channel is provided with a front end opening and a rear end opening in the shell, a water column which can slide along the channel and circulate liquid is placed in the channel, the rear end of the water column is connected to a water outlet mechanism, the water outlet mechanism is used to withstand the impact of the liquid flowing through the water column, and form a gap or increase the gap between the water column and the rear end opening, and the liquid is sprayed out from the gap; a positioning ring connected to the shell is provided in the channel, the water column passes through the positioning ring, the water column sleeve is provided with a compression spring and the two ends of the compression spring are respectively connected to the positioning ring. The outer surface of the water column and the compression spring is provided with a first sleeve fixed on the positioning ring and a second sleeve fixed on the front end of the water column, the first sleeve is slidably sleeved on or sleeved on the second sleeve, and the sliding contact surfaces of the two are provided with multiple O-rings; the water outlet mechanism includes a diverter body and a cover body that can be matched and inserted in the rear end opening, the front end and the rear end of the diverter body are respectively connected to the water column and the cover body, and the front end of the diverter body has at least two diversion channels, which divert the liquid flowing through the water column from the middle to the side.

2. The nozzle according to claim 1, characterized in that The rear end of the diverter body has a fixed shaft coaxial with the cover body, the cover body is fixed on the fixed shaft, a turntable is provided between the diverter body and the cover body, the turntable is rotatably sleeved on the fixed shaft, and a plurality of guide plates oblique to the meridian are provided on its front end surface around the circumference.

3. The nozzle according to claim 1, characterized in that A filter barrel is provided in the channel and is sleeved outside the first sleeve and the second sleeve. The rear end of the filter barrel is open and fixed to the positioning ring. The front end cover of the filter barrel allows liquid to flow into the barrel. A plurality of impurity adsorbents are provided on the inner wall of the filter barrel.

4. The nozzle according to claim 3, characterized in that There is a gap between the filter barrel and the inner wall of the channel to form an annular space, and a plurality of strong magnetic parts are arranged in the annular space.

5. The nozzle according to claim 3, characterized in that The middle portion of the front end cover of the filter barrel is a solid area, and a portion between the solid area and the outer edge of the filter barrel is provided with a plurality of through holes for allowing liquid to pass through.

6. The nozzle according to claim 5, characterized in that The rear end surface of the front end cover of the filter barrel is located in a solid area and is provided with a guide cylinder coaxial with the water column. The outer wall of the guide cylinder is provided with a spiral convex part.

7. A herbicide spraying device for synchronous transplanting of rice seedlings by a rice transplanter, characterized in that: The invention comprises a water tank containing herbicide, a water pipe, a plurality of nozzles according to any one of claims 1 to 6 installed in parallel in the water pipe at equal intervals, and a water pump for pumping the herbicide in the water tank to the water pipe through a pipe, wherein the water tank is installed in a rice transplanter, the water pipe is horizontally placed below the rice transplanting channel of the rice transplanter, the nozzles and the rice transplanting channel are staggered, the maximum spraying ranges of adjacent nozzles do not overlap, and the maximum spraying ranges of the nozzles cover the rice transplanting points of adjacent rice transplanting channels.

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