Paddy rice liquid fertilizer normal-position deep application device

Abstract

The invention relates to the technical field of agricultural fertilizer application equipment, in particular to a rice liquid fertilizer normal-position deep application device which comprises a total fertilizer box connected with a mounting table; the high-pressure fertilizer distributing assembly comprises a low-pressure air pump, a high-pressure air pump, a speed measuring mechanism and a plurality of fertilizer distributing boxes; the soil entering and ditching assembly comprises an adjusting mechanism, a grooving cutter and an injection mechanism; and the vibration cleaning assembly comprises an energy storage mechanism and an airflow cleaning mechanism, the energy storage mechanism is used for converting vibration generated by contact of the grooving cutter and soil into compressed air to be stored, and the airflow cleaning mechanism is used for cleaning the injection mechanism through the stored compressed air. The device effectively solves the problems of blockage, incapability of normal-position application and point application and the like in a base fertilizer deep application process, and greatly improves the working efficiency and quality of rice base fertilizer deep application.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural fertilization equipment, in particular to a device for deep application of liquid fertilizer for rice. Background Art

[0002] Deep application of basal fertilizer during rice transplanting can effectively improve fertilizer utilization rate, shorten the seedling period, promote root growth, increase rice yield, reduce the number of fertilization and fertilizer usage, reduce labor input and nutrient loss, and promote the reduction and efficiency of chemical fertilizers and the green and high-quality development of agriculture. At present, the research on the deep application technology of basal fertilizer for rice is mainly focused on the deep side application of solid granular fertilizer, generally using a one-time fertilization or a one-base and one-topdressing method. The operating machinery is a fertilizer and transplanting machine with a side deep fertilization device or a side deep fertilization device is installed on an existing transplanter. The fertilizer transportation method is mainly divided into two types: air blowing and screw rod transportation. The fertilization method is strip application; the landing point should be 3-5 cm on the side of the seedling and 4-6 cm deep, and the scraper should be used to enhance the covering effect.

[0003] Application No. CN201510307610.0 "A Fertilizer Application Device for Liquid Fertilizers" proposes a liquid fertilizer application device suitable for rice production, the main structure of which includes a fertilizer container, a fertilizer outlet pipe, and a stirring device. The solution uses a method combined with paddy field irrigation to complete the application of liquid fertilizer in paddy fields. Specifically, the device is placed at the water inlet of the paddy field so that the liquid fertilizer is fully mixed with the irrigation water and the liquid fertilizer is applied to the field in a flooding manner. The device uses a passive pressure compensation system to ensure uniform mixing of water and fertilizer, but this type of system has a certain delay that may cause the water-fertilizer mixing ratio to fluctuate within a certain range. At the same time, the device applies fertilizer in a surface water flooding manner, which not only uses a large amount of fertilizer but also causes some volatile or easily decomposable components in the fertilizer to be lost into the air, greatly reducing the utilization rate of the fertilizer. In addition, the device has high requirements for the particle uniformity and hygroscopicity of the fertilizer. Fertilizers with poor particle uniformity or high hygroscopicity are very likely to cause blockage of the fertilizer discharge mechanism and the fertilizer outlet. Summary of the invention

[0004] The object of the present invention is to provide a device for deep application of liquid fertilizer to rice to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A device for deep application of liquid fertilizer for rice, comprising: A total fertilizer box, the total fertilizer box is used to store liquid fertilizer, and the total fertilizer box is connected to a mounting platform; A high-pressure fertilizer distribution component, the high-pressure fertilizer distribution component includes a low-pressure air pump, a high-pressure air pump, a speed measuring mechanism and a plurality of fertilizer distribution boxes, the low-pressure air pump and the high-pressure air pump are both arranged on the mounting platform, the low-pressure air pump is connected to the mounting platform, the low-pressure air pump is used to input the liquid fertilizer in the total fertilizer box into the fertilizer distribution box, the high-pressure air pump is used to apply the liquid fertilizer in the fertilizer distribution box into the soil in a spot application or a strip application manner, the speed measuring mechanism is used to detect the moving speed of the rice transplanter, and the fertilization speed of the high-pressure air pump will be adjusted according to the speed measurement result of the speed measuring mechanism when spot application is performed; A trenching assembly for entering the soil, the trenching assembly for entering the soil comprising an adjustment mechanism, a slotting knife and an injection mechanism, the adjustment mechanism is used to adjust the position of the injection mechanism, the slotting knife is used to open a fine groove deep below the side of the seedling planting row, and the injection mechanism is used to inject liquid fertilizer into the rice seedling field directly below the seedling planting row; A vibration cleaning assembly, the vibration cleaning assembly includes an energy storage mechanism and an airflow cleaning mechanism, the energy storage mechanism is used to convert the vibration generated by the contact between the slotting knife and the soil into compressed air for storage, and the airflow cleaning mechanism is used to use the stored compressed air to clean the injection mechanism.

[0006] Preferably, the total fertilizer tank is installed on the rice transplanter, and the total fertilizer tank is provided with a contact liquid level sensor.

[0007] Preferably, the speed measuring mechanism includes a hanging bracket, a magnetic base and an axis angle speed sensor, the hanging bracket is connected to the total fertilizer box, the magnetic base is rotatably connected to the hanging bracket, the magnetic base and the rear wheel of the rice transplanter are coaxially arranged and the magnetic base and the rear wheel of the rice transplanter move synchronously, and the axis angle speed sensor is arranged on the hanging bracket and is used for real-time monitoring of the angular velocity of the magnetic base rotating with the rear wheel of the rice transplanter.

[0008] Preferably, the fertilizer distribution box is provided with a second contact liquid level sensor.

[0009] Preferably, the fertilizer distribution box is provided with a normally closed solenoid valve, which is opened when the low-pressure air pump delivers liquid fertilizer to the fertilizer distribution box, and is used to discharge the gas in the fertilizer distribution box.

[0010] Preferably, there are several slotting knives, and the adjustment mechanism includes an adjustment seat and a bottom hanging plate. There are several adjustment seats, and several adjustment seats are connected to the rice transplanter. The adjustment seat is provided with several bolt through holes, and the position of the bottom hanging plate is adjusted by connecting the bottom hanging plate to different bolt through holes. Several slotting knives are arranged on the bottom hanging plate in groups of two at equal intervals.

[0011] Preferably, the injection mechanism includes a high-pressure one-way valve, an injection tube and a fixing sleeve, the high-pressure one-way valve is connected to the fertilizer distribution box, the injection tube is connected to the high-pressure one-way valve, and the fixing sleeve is arranged on the slotting knife and is used to fix the injection tube to the slotting knife.

[0012] Preferably, the energy storage mechanism includes a cylinder, a connecting rod, a piston block, a return spring and a gas tank, the cylinder is provided with the bottom hanging plate, the piston block is provided in the cylinder, the two ends of the connecting rod are respectively connected to the slotting knife and the piston block, the two ends of the return spring are respectively connected to the piston block and the cylinder, and when the piston block reciprocates along the cylinder, air is input into the gas tank.

[0013] Preferably, the airflow cleaning mechanism comprises a pressure relief valve and a connecting valve, the pressure relief valve is connected to the gas tank, and two ends of the connecting valve are respectively connected to the pressure relief valve and the injection tube.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can realize the deep and correct application of liquid fertilizer to rice by spot application or strip application; when performing spot application, the forward speed of the rice transplanter is read in real time by the setting of a speed measuring mechanism; according to the detection result of the speed measuring mechanism, the high-pressure air pump is controlled to drive the injection mechanism to realize precise and correct point application; through the setting of a vibration cleaning component, the vibration generated by the contact between the slotting knife and the soil is converted into compressed air for storage; and the fertilizer and soil blocked on the outside of the injection tube are cleaned by the stored compressed air; the device effectively solves the problems of blockage, inability to apply in the correct position and spot application during the deep application of base fertilizer, and greatly improves the operation efficiency and quality of deep application of base fertilizer to rice. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the whole machine of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the total fertilizer box of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the fertilizer distribution box of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the mounting platform of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the speed measuring mechanism of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the slotting knife of the present invention; Figure 8 It is a schematic diagram of the structure of the vibration cleaning component of the present invention.

[0016] In the figure: 1 total fertilizer box, 2 mounting table, 3 low-pressure air pump, 4 high-pressure air pump, 5 fertilizer distribution box, 6 intake manifold, 7 slotting knife, 8 bracket, 9 magnetic base, 10 axis angle speed sensor, 11 normally closed solenoid valve, 12 adjustment seat, 13 bottom hanging plate, 14 high-pressure one-way valve, 15 injection tube, 16 fixing sleeve, 17 cylinder, 18 connecting rod, 19 piston block, 20 return spring, 21 gas tank, 22 pressure relief valve, 23 connecting valve, 101 contact liquid level sensor 1, 501 contact liquid level sensor 2, 502 low-pressure one-way valve. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 8 , the present invention provides a technical solution: A device for deep application of liquid fertilizer for rice, as shown in the attached manual Figure 1 As shown, including: A total fertilizer tank 1, which is used to store liquid fertilizer. The total fertilizer tank 1 is installed on the rice transplanter. In this embodiment, the total fertilizer tank 1 is composed of two left and right fertilizer tanks with bilaterally symmetrical structures. A contact liquid level sensor 101 is provided at the bottom of the left fertilizer tank and the right fertilizer tank. A plurality of liquid fertilizer outlets are provided on the left fertilizer tank and the right fertilizer tank. The liquid fertilizer outlets are used to transport liquid fertilizer to each fertilizer distribution box 5. The total fertilizer tank 1 is connected to a mounting platform 2 through a pipeline. In this embodiment, the mounting platform 2 is arranged in the cab of the rice transplanter, and the mounting platform 2 is provided with a console for controlling the operation of each mechanism; The high-pressure fertilizer distribution component includes a low-pressure air pump 3, a high-pressure air pump 4, a speed measuring mechanism and a plurality of fertilizer distribution boxes 5. The low-pressure air pump 3 and the high-pressure air pump 4 are both arranged on a mounting platform 2. The low-pressure air pump 3 is connected to the mounting platform 2. The low-pressure air pump 3 is connected to the total fertilizer box 1 through a low-pressure air inlet nozzle. The low-pressure air pump 3 is used to input the liquid fertilizer in the total fertilizer box 1 into the fertilizer distribution box 5 by pressurizing the total fertilizer box 1. The high-pressure air pump 4 is used to apply the liquid fertilizer in the fertilizer distribution box 5 into the soil in a spot application or strip application manner. The low-pressure air pump 3 and the high-pressure air pump 4 are used to apply the liquid fertilizer in the fertilizer distribution box 5 to the soil in a spot application or strip application manner. The compressed air pumps 4 are all dual-output micro DC diaphragm air pumps with an operating voltage of 12V, wherein the high-pressure air pump 4 is connected to an intake manifold 6 interconnected with each fertilizer box 5, and the intake manifold 6 is used to evenly distribute the high-pressure gas output by the high-pressure air pump 4 to each fertilizer box 5. The speed measuring mechanism is used to detect the moving speed of the rice transplanter. When performing spot application, the fertilization speed of the high-pressure air pump 4 will be adjusted according to the speed measurement result of the speed measuring mechanism. A low-pressure one-way valve 502 interconnected with the fertilizer delivery pipe of the total fertilizer box 1 is arranged above the fertilizer box 5; The in-soil trenching assembly includes an adjustment mechanism, a slotting knife 7 and an injection mechanism. The adjustment mechanism is used to adjust the position of the injection mechanism. The slotting knife 7 is used to open a fine groove deep below the side of the seedling planting row. The injection mechanism is used to inject liquid fertilizer into the rice field directly below the seedling planting row in a spot or strip manner; The vibration cleaning assembly includes an energy storage mechanism and an airflow cleaning mechanism. The energy storage mechanism is used to convert the vibration generated by the contact between the slotting knife 7 and the soil into compressed air for storage. The airflow cleaning mechanism is used to use the stored compressed air to clean the injection mechanism.

[0019] The speed measuring mechanism includes a hanging bracket 8, a magnetic base 9 and an axis angle speed sensor 10. The hanging bracket 8 is fixedly connected to the total fertilizer box 1. When in use, a group of speed measuring mechanisms can be respectively arranged on both sides of the total fertilizer box 1 to improve the accuracy of the test. The magnetic base 9 is rotatably connected to the hanging bracket 8. The magnetic base 9 and the rear wheel of the rice transplanter are coaxially arranged and the magnetic base 9 is magnetically adsorbed to the rear wheel of the rice transplanter. Therefore, the magnetic base 9 and the rear wheel of the rice transplanter move synchronously. The axis angle speed sensor 10 is arranged on the hanging bracket 8 and is used to monitor the angular velocity of the magnetic base 9 rotating with the rear wheel of the rice transplanter in real time.

[0020] The fertilizer distribution box 5 is provided with a contact type liquid level sensor 501, and the contact type liquid level sensor 501 is used to detect whether there is a lack of liquid in the fertilizer distribution box 5.

[0021] A normally closed solenoid valve 11 is arranged on the top of the fertilizer distribution box 5. The normally closed solenoid valve 11 is opened when the low-pressure air pump 3 delivers liquid fertilizer to the fertilizer distribution box 5. The normally closed solenoid valve 11 is used to discharge the gas in the fertilizer distribution box 5. A high-pressure one-way valve 14 is arranged at the bottom of the fertilizer distribution box 5. In this embodiment, the high-pressure one-way valve 14 is interconnected with the high-pressure air pump 4 through the intake manifold 6. When the fertilization operation is performed, the normally closed solenoid valve 11 is in a power-off state (the valve body is closed). Under the action of the high-pressure gas input by the intake manifold 6, the liquid fertilizer in each fertilizer distribution box 5 flows out from the high-pressure one-way valve 14 in the form of point application or strip application, and is injected into the soil of the rice field through the injection tube 15.

[0022] In this embodiment, six slotting knives 7 are provided, and the adjustment mechanism includes an adjustment seat 12 and a bottom hanging plate 13. Three adjustment seats 12 are provided, and several adjustment seats 12 are connected to the rice transplanter. The adjustment seat 12 is provided with several bolt through holes. The position of the bottom hanging plate 13 is adjusted by connecting the bottom hanging plate 13 to different bolt through holes. The six slotting knives 7 are arranged in groups of two (three groups in total) at equal intervals on the bottom hanging plate 13.

[0023] The injection mechanism includes a high-pressure one-way valve 14, an injection tube 15 and a fixed sleeve 16. The high-pressure one-way valve 14 is connected to the bottom of the fertilizer distribution box 5. In this embodiment, the low-pressure one-way valve 502 and the high-pressure one-way valve 14 are both made of 304 stainless steel to improve the reliability and life of the one-way valve, and the flow direction of liquid fertilizer in the low-pressure one-way valve 502 and the high-pressure one-way valve 14 is from top to bottom. One end of the injection tube 15 and the high-pressure one-way valve 14 are interconnected. The fixed sleeve 16 is arranged on the slotting knife 7 and is used to fix the injection tube 15 to the slotting knife 7. The fixed sleeve 16 is fixedly connected to the slotting knife 7 by welding. The slotting knife 7 has a flat angle at the rear side of the bottom of the bend near the fertilizer outlet at the bottom of the injection tube 15 to reduce the influence of the slotting knife on the injection range of the base fertilizer.

[0024] The energy storage mechanism includes a cylinder 17, a connecting rod 18, a piston block 19, a return spring 20 and an air tank 21. The cylinder 17 is fixedly connected to the bottom hanging plate 13, the piston block 19 is slidably connected to the cylinder 17, and a sealing gasket for dynamic sealing is arranged between the piston block 19 and the cylinder 17. The two ends of the connecting rod 18 are respectively rotatably connected to the slotting knife 7 and the piston block 19, and the two ends of the return spring 20 are respectively fixedly connected to the piston block 19 and the cylinder 17. The setting of the return spring 20 can effectively prevent the direct rigid collision between the stones in the field and the slotting knife 7, and effectively increase the service life of the slotting knife 7. The return spring 20 is a compression spring. When selecting the return spring 20, it is necessary to ensure that the slotting knife 7 is always at a depth of 8-10 cm directly below the seedling during the fertilization process. The return spring 20 is used to drive the piston block 19 to reset. When the piston block 19 reciprocates along the cylinder 17, air will be input into the air tank 21. The pipe connected between the cylinder 17 and the air tank 21 is a hose.

[0025] The airflow cleaning mechanism includes a pressure relief valve 22 and a connecting valve 23, both of which are solenoid valves. When the pressure relief valve 22 is opened, the compressed air in the gas tank 21 will enter the injection tube 15 through the connecting valve 23 and then clean the soil and fertilizer in the fertilizer outlet of the injection tube. The pressure relief valve 22 is connected to the gas tank 21 through a pipeline. The connecting valve 23 is a three-way valve. The three ends of the connecting valve 23 are respectively connected to the fertilizer distribution box 5, the injection tube 15 and the pressure relief valve 22. When cleaning is not performed, the fertilizer distribution box 5 and the injection tube 15 are connected to each other by controlling the connecting valve 23, and the end of the connecting valve 23 connected to the pressure relief valve 22 is closed. When cleaning is performed, the injection tube 15 and the pressure relief valve 22 are connected to each other by controlling the connecting valve 23, and the end of the connecting valve 23 connected to the fertilizer distribution box 5 is closed.

[0026] Working principle: before operation, adjust the installation distance between each group of slotting knives 7 according to the rice transplanting row spacing (here the row spacing is set to L, and the row spacing L is generally 30 cm or 25 cm). The adjustment requirement is that the bottom edge line of each slotting knife 7 is 5 cm away from the outside of the rice transplanting row. After the adjustment is completed, the distance between the bottom edge lines of each group of slotting knives 7 is L+10 cm; assuming that the rice transplanting spacing is M (the rice transplanting spacing M is generally 10 cm, 12 cm, 14 cm, 16 cm, 18 cm or 22 cm), adjust the position of the bottom hanging plate 13 on the adjustment seat 12 according to the rice transplanting spacing M (so as to ensure that the deep application point of the liquid fertilizer is just 8-10 cm deep below the seedlings). After the adjustment is completed, fill the liquid fertilizer in the total fertilizer box 1, adsorb the magnetic base 9 on the rear wheel of the rice transplanter, and the auxiliary operator enters the rice transplanting spacing executed by the rice transplanter on the display screen of the console of the device, turns on the automatic liquid replenishment function, and selects the fertilization method (spot application or strip application). When the rice transplanter drives to the working field and starts transplanting rice, the assistant operator immediately clicks on the display screen of the device console to start the operation; During operation, the liquid fertilizer in the total fertilizer tank 1 is evenly distributed to each fertilizer tank 5 in advance under the action of the low-pressure air pump 3; When the spot application method is selected for fertilization, the high-pressure air pump 4 is intermittently powered, and the high-pressure gas generated by it moves along the intake manifold 6 so that the liquid fertilizer in each fertilizer distribution box 5 is injected into the soil of the rice field along the injection pipe 15 to complete the spot application of the liquid fertilizer; When the strip application method is selected for fertilization, the high-pressure air pump 4 is kept on, and the high-pressure gas generated by it moves along the intake manifold 6 so that the liquid fertilizer in each fertilizer distribution box 5 is injected into the soil of the rice field along the fertilizer outlet of the injection tube 15 to complete the strip application of liquid fertilizer; When the rice transplanter stops or the contact liquid level sensor 2 501 in the fertilizer distribution box 5 detects a lack of liquid, the low-pressure air pump 3 is started through the control console, the normally closed electromagnetic valve 11 is opened, and the high-pressure air pump 4 is closed. At this time, the liquid fertilizer in the total fertilizer box 1 is pushed open by the low-pressure one-way valve 502 along the fertilizer delivery pipe and input into the fertilizer distribution box 5 under the action of the low-pressure air pump 3, and the gas in each fertilizer distribution box 5 is discharged along each normally closed electromagnetic valve 11; When the slotting knife 7 is slotting, the force it receives is unbalanced, so the slotting knife 7 will move. During the movement, the slotting knife 7 drives the piston block 19 to move along the cylinder 17, and then the reset spring 20 drives the piston block 19 to reset (thereby driving the slotting knife 7 to reset). As the piston block 19 reciprocates along the cylinder 17, the air will be compressed into the gas tank 21. When the injection tube 15 needs to be cleaned, the pressure relief valve 22 is opened, and the compressed air in the gas tank 21 will be ejected through the connecting valve 23 to clean the fertilizer outlet of the injection tube 15.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for deep application of liquid fertilizer to rice, characterized in that: include: A total fertilizer box, the total fertilizer box is used to store liquid fertilizer, and the total fertilizer box is connected to a mounting platform; A high-pressure fertilizer distribution component, the high-pressure fertilizer distribution component includes a low-pressure air pump, a high-pressure air pump, a speed measuring mechanism and a plurality of fertilizer distribution boxes, the low-pressure air pump and the high-pressure air pump are both arranged on the mounting platform, the low-pressure air pump is connected to the mounting platform, the low-pressure air pump is used to input the liquid fertilizer in the total fertilizer box into the fertilizer distribution box, the high-pressure air pump is used to apply the liquid fertilizer in the fertilizer distribution box into the soil in a spot application or a strip application manner, the speed measuring mechanism is used to detect the moving speed of the rice transplanter, and the fertilization speed of the high-pressure air pump will be adjusted according to the speed measurement result of the speed measuring mechanism when spot application is performed; A trenching assembly for entering the soil, the trenching assembly for entering the soil comprising an adjustment mechanism, a slotting knife and an injection mechanism, the adjustment mechanism is used to adjust the position of the injection mechanism, the slotting knife is used to open a fine groove deep below the side of the seedling planting row, and the injection mechanism is used to inject liquid fertilizer into the rice seedling field directly below the seedling planting row; A vibration cleaning assembly, the vibration cleaning assembly includes an energy storage mechanism and an airflow cleaning mechanism, the energy storage mechanism is used to convert the vibration generated by the contact between the slotting knife and the soil into compressed air for storage, and the airflow cleaning mechanism is used to use the stored compressed air to clean the injection mechanism.

2. A device for deep application of liquid fertilizer to rice according to claim 1, characterized in that: The total fertilizer tank is installed on the rice transplanter, and the total fertilizer tank is provided with a contact type liquid level sensor 1.

3. A device for deep application of liquid fertilizer to rice according to claim 2, characterized in that: The speed measuring mechanism includes a hanging bracket, a magnetic base and an axis angle speed sensor, the hanging bracket is connected to the total fertilizer box, the magnetic base is rotatably connected to the hanging bracket, the magnetic base and the rear wheel of the rice transplanter are coaxially arranged and the magnetic base and the rear wheel of the rice transplanter move synchronously, and the axis angle speed sensor is arranged on the hanging bracket and is used for real-time monitoring of the angular velocity of the magnetic base rotating with the rear wheel of the rice transplanter.

4. A device for deep application of liquid fertilizer to rice according to claim 1, characterized in that: The fertilizer distribution box is provided with a second contact type liquid level sensor.

5. The device for deep application of liquid fertilizer to rice according to claim 1, characterized in that: The fertilizer distribution box is provided with a normally closed solenoid valve, which is opened when the low-pressure air pump delivers liquid fertilizer to the fertilizer distribution box, and is used to discharge the gas in the fertilizer distribution box.

6. The device for deep application of liquid fertilizer to rice according to claim 1, characterized in that: There are several slotting knives, and the adjustment mechanism includes an adjustment seat and a bottom hanging plate. There are several adjustment seats, and several adjustment seats are connected to the rice transplanter. The adjustment seat is provided with several bolt through holes. The position of the bottom hanging plate can be adjusted by connecting the bottom hanging plate to different bolt through holes. Several slotting knives are arranged on the bottom hanging plate in groups of two with equal intervals.

7. A device for deep application of liquid fertilizer to rice according to claim 6, characterized in that: The injection mechanism includes a high-pressure one-way valve, an injection tube and a fixing sleeve, the high-pressure one-way valve is connected to the fertilizer distribution box, the injection tube is connected to the high-pressure one-way valve, and the fixing sleeve is arranged on the slotting knife and is used to fix the injection tube to the slotting knife.

8. The device for deep application of liquid fertilizer to rice according to claim 7, characterized in that: The energy storage mechanism includes a cylinder, a connecting rod, a piston block, a return spring and a gas tank. The cylinder is provided with the bottom hanging plate, the piston block is provided in the cylinder, the two ends of the connecting rod are respectively connected to the slotting knife and the piston block, the two ends of the return spring are respectively connected to the piston block and the cylinder, and when the piston block reciprocates along the cylinder, air is input into the gas tank.

9. A device for deep application of liquid fertilizer to rice according to claim 8, characterized in that: The airflow cleaning mechanism comprises a pressure relief valve and a connecting valve, wherein the pressure relief valve is connected to the gas tank, and two ends of the connecting valve are respectively connected to the pressure relief valve and the injection tube.

Images