Disc fertilizer device, fertilizer application system and potato planter equipped with the same

Abstract

The present invention discloses a disc-type fertilizer dispensing device, a fertilizer system equipped with the device, and a potato planter equipped with the device, belonging to the technical field of planters. The fertilizer dispensing device includes a fertilizer dispenser having a fertilizer dispensing port. The device is characterized by comprising a fixed bracket, an elastic rotary disc bracket fixed to the fixed bracket, a fertilizer disc mounted on the lower portion of the elastic rotary disc bracket via a rotating shaft, a baffle plate provided on one side of the fertilizer disc, a fertilizer dispensing baffle plate mounted on the elastic rotary disc bracket, a fertilizer dispensing channel formed between the fertilizer dispensing baffle plate and the fertilizer disc, a fertilizer inlet provided in the fertilizer dispensing channel, and a fertilizer inlet connected to the fertilizer dispensing port via a fertilizer pipe; the elastic rotary disc bracket includes a support, the support is mounted on the disc bracket via a pin, a coil spring mounted on the pin to apply elastic force to the relative movement between the support and the disc bracket; the support is provided with a plurality of staggered circular holes, the support is provided with a rod sleeve inserted into the staggered circular holes, and the rod sleeve is connected to one end of the coil spring. The fertilizer dispensing device has a compact structure, strong flowability, and can avoid clogging.

Description

Technical Field

[0001] The invention belongs to the technical field of seed drills, and in particular relates to a disc-type fertilizer application device, a fertilizer application system equipped with the device, and a potato seed drill. Background Art

[0002] my country's annual potato production exceeds 10,000 tons, accounting for a quarter of the world's total, making it the world's largest potato producer. To improve potato planting efficiency and sowing quality, most planters are now capable of simultaneously completing the entire process of fertilizing, furrowing, sowing, ridging, and covering the soil. To maintain and improve soil fertility and reduce disease, most farmers have adopted crop rotation and rotation, and prioritized prudent fertilization. This ensures soil fertility, increases potato yields, and enhances efficiency, while also improving potato quality and protecting ecological safety. Potato planters often utilize a simultaneous sowing and fertilization method to ensure prudent fertilization, improve the utilization rate of seed fertilizer, and fully supply nutrients to the crop during the seedling stage, creating favorable conditions for growth and development, fostering healthy and vigorous seedlings and laying the foundation for high potato yields.

[0003] However, improper fertilization with a potato planter can not only waste fertilizer but also potentially damage seeds and seedlings. The factors that influence fertilizer utilization are quite complex. Potato planters primarily use a fertilizer dispenser to control fertilizer application rate and a fertilizer placement device to control fertilizer application accuracy, thereby achieving the goal of improving fertilizer utilization.

[0004] Usually, the fertilizer spreader is connected to the ground wheel of the seeder through a chain drive, so that the fertilizer discharge amount of the fertilizer spreader matches the travel speed of the seeder, which can effectively ensure the fertilizer and seed sowing amount required by agronomic requirements.

[0005] Before potato planting, the soil is typically tilled and deep-loosed after crop rotation. This leaves clods of soil, straw, and other debris on the surface, reducing soil mobility near the fertilizer distribution mechanism. Excessive debris, coupled with the high humidity and viscosity of the soil before planting, can often cause the fertilizer distribution mechanism's fertilizer duct to become clogged. Under these conditions, if the elastic components of the fertilizer distribution mechanism are insufficiently rigid, resulting in excessive elastic deformation, a large amount of soil and debris can become trapped at the front end, severely impacting the planter's maneuverability and significantly increasing the tractor's traction resistance. When this occurs during the planting process, the only option is to pause the sowing operation and lift the planter off the ground. The fertilizer distribution mechanism's fertilizer duct can then be manually cleared, freeing the accumulated soil and debris. The planter can then be lowered and the fertilizer distribution mechanism can be re-entered to continue fertilizer distribution. This cleaning process not only reduces sowing efficiency but also significantly impacts seeding quality. Furthermore, large amounts of fertilizer can leak during the cleaning process, seriously contaminating the soil. It can be seen that whether the seeder can complete the fertilization normally and reasonably under complex working conditions and harsh working environment is the key to the sowing operation, so the design of the fertilization device has always been the research focus and difficulty of the potato planter.

[0006] At present, the fertilizer dispensing devices assembled in potato planters mainly include tube-type fertilizer dispensing devices and sliding shoe-type fertilizer dispensing devices.

[0007] See also Figure 5 The tubular fertilizer dispensing device includes a square steel spring 11, a fertilizer pipe 6, a fertilizer dispenser 12 and a furrow opener 13. The fertilizer dispenser is installed on the rear structure of the seed drill through the square steel spring. The fertilizer dispenser is connected to the fertilizer discharge port of the fertilizer dispenser equipped with the seed drill through the fertilizer pipe. The seed fertilizer in the fertilizer dispenser is discharged from the fertilizer dispenser through the fertilizer pipe. The furrow opener is used in conjunction with the fertilizer dispenser to apply the seed fertilizer to a specified position in the soil. The advantages of the fertilizer dispensing device of this structure are: compact structure, low traction resistance, good soil passability, and can ensure that the seed fertilizer is clean, and the farming environment will not be polluted during the fertilizer dispensing process. However, the disadvantage of the fertilizer dispensing device of this structure is that since the seed fertilizer dispensing structure of the tubular fertilizer dispensing device is closed, the fertilizer pipe port needs to be directly extended into the interior of the soil through the fertilizer dispenser at its lower end when dispensing fertilizer, which causes the soil to easily flow into the interior of the fertilizer pipe and cause blockage.

[0008] See also Figure 6The sliding shoe fertilizer dispensing device includes a flat steel spring 14, a sliding shoe fertilizer dispenser 15, a funnel 16 and a guide tray 17. The sliding shoe fertilizer dispenser is installed on the rear structure of the seed drill through the flat steel spring. The guide tray is arranged above the sliding shoe fertilizer dispenser, and the fertilizer discharge port of the fertilizer dispenser is located above the guide tray. The seed fertilizer discharged from the fertilizer discharge port of the fertilizer dispenser slides into the funnel through the guide tray and is introduced into the sliding shoe fertilizer dispenser by the funnel. The sliding shoe fertilizer dispenser, the funnel and the guide tray are open. The advantages of the fertilizer dispensing device of this structure are: the open structural design can completely avoid soil blockage. However, this structure fertilizer dispensing device has many disadvantages, including: 1. Waste and pollution of seed fertilizer. When the seed fertilizer falls in an open environment, small particles of seed fertilizer are easily blown away by the wind and pollute the farming environment. 2. It is easy to cause blockage by foreign matter. Foreign matter in the farming environment is easily blown into the open seed fertilizer conveying path by the wind, causing blockage by foreign matter. 3. The structure is not compact and is bulky. The components of the device are large in size and weight, and the positions of the components are loose, resulting in a large overall size of the device. 4. The traction resistance is large. The lower section of the sliding shoe fertilizer dispenser slides relative to the surface, which not only easily causes component wear, but also the large friction increases the traction resistance.

[0009] From the above, it can be seen that the tubular fertilizer feeding device and the sliding shoe fertilizer feeding device each have their own advantages and disadvantages, and the elastic parts cannot adjust the stiffness, which limits the soil permeability. A fertilizer feeding device that has existing advantages and can overcome the disadvantages has certain research value and practical value. Summary of the Invention

[0010] In view of the problems existing in the prior art, the present invention provides a disc-type fertilizer applying device which solves the problems of the prior fertilizer applying device easily causing soil blockage and poor passability.

[0011] The present invention is realized in this way. A disc-type fertilizer dispensing device includes a fertilizer dispenser, and the fertilizer dispenser has a fertilizer dispensing port. The device is characterized in that it includes a fixed bracket, an elastic turntable bracket is fixed on the fixed bracket, a fertilizer turntable is installed on the lower part of the elastic turntable bracket through a rotating shaft, a fertilizer dispensing baffle is provided on one side of the fertilizer turntable and is relatively fixed to the position of the fertilizer turntable, the fertilizer dispensing baffle is installed on the elastic turntable bracket, a fertilizer dispensing slot is formed between the fertilizer dispensing baffle and the corresponding side surface of the fertilizer turntable, a fertilizer inlet is provided on the fertilizer dispensing slot, and the fertilizer is dispensed through the fixed bracket. The inlet and the fertilizer outlet are connected through a fertilizer pipe; the fertilizer transported by the fertilizer pipe is applied to the soil through the fertilizer slit formed by the fertilizer baffle and the fertilizer disc; the elastic turntable bracket includes a support fixed to the fixed bracket, the support is mounted on the disc bracket via a pin arranged horizontally and transversely along the axis, and the pin is fitted with a coil spring that applies elastic force to the relative movement between the support and the disc bracket; the support is provided with a plurality of staggered circular holes, and the support is provided with a rod sleeve inserted into the staggered circular holes, and the rod sleeve is connected to one end of the coil spring. The support is welded with a pin stop portion for limiting the swing angle of the disc bracket around the pin. A scraper blade is provided on one side of the fertilizer disc, which is fixed relative to the fertilizer disc and is mounted on the elastic turntable bracket.

[0012] The present invention has the following technical effects:

[0013] 1. The present invention has the characteristics of compact structure. The fertilizer feeding path is fully enclosed, which can avoid the pollution of fertilizer and farming environment.

[0014] 2. The fertilizer turntable at the bottom of the device rotates and contacts the ground, and the elastic turntable bracket above the fertilizer turntable has its own elasticity and can adjust the stiffness according to the characteristics of the soil. The friction between the device and the ground is small, the traction resistance is small, and the soil passability is strong, which can solve the problem of difficulty or inability to apply fertilizer by potato planters in sticky soil and soil with a lot of impurities.

[0015] 3. The elastic stiffness of the device can be adjusted according to the different soil conditions, effectively improving the accuracy and work efficiency of fertilization.

[0016] 4. As a component of the seed fertilizer outlet, the fertilizer dispensing channel formed by the fertilizer dispensing disc and the fertilizer dispensing baffle is not easily blocked by the soil when the fertilizer dispensing disc is rotating, thereby avoiding blockage and further improving the soil passability of the device.

[0017] In the above technical solution, preferably, a limiting groove is provided on the rear side of the disc bracket corresponding to the fixed bracket. The limiting groove is used to limit the amplitude of the disc bracket's rearward swing.

[0018] In the above technical solution, preferably, the angle between the axis of the rotating shaft and the horizontal plane is 8°-15°. The design of the angle can improve the stability of the device when it is supported on the ground.

[0019] In the above technical solution, preferably, the fixing bracket is provided with a plurality of vertically distributed circular holes for installing the support.

[0020] A second object of the present invention is to provide a potato planter fertilization system, comprising two fertilizer boxes, wherein eight sets of any of the above-mentioned disc-type fertilizer-dispensing devices are installed at the lower part of the fertilizer box, and the eight sets of disc-type fertilizer-dispensing devices constitute a group of fertilization units in pairs, and the two fertilizer turntables in the same group of fertilization units are arranged at an eight-shaped angle.

[0021] A third object of the present invention is to provide a potato planter equipped with any of the above-mentioned disc-type fertilizer application devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the installation structure of the elastic turntable bracket in the present invention;

[0023] Figure 2 It is a structural schematic diagram of the fertilization unit in the present invention;

[0024] Figure 3 It is a structural diagram of the fertilization system of the present invention;

[0025] Figure 4 This is a schematic diagram of the installation structure of the fertilizer application device of the present invention;

[0026] Figure 5 It is a structural diagram of a tubular fertilizer feeding device in the background technology of this application;

[0027] Figure 6 It is a structural diagram of a sliding shoe type fertilizer feeding device in the background technology of this application.

[0028] In the figure, 1. fertilizer dispenser; 1-1. fertilizer box; 1-2. fertilizer discharge shaft; 1-3. spiral guide plate; 2. fixed bracket; 3. elastic turntable bracket; 3-1. support; 3-2. disc bracket; 3-3. coil spring; 3-4. pin stop; 3-5. rod sleeve; 4. fertilizer turntable; 5. fertilizer dispensing baffle; 6. fertilizer pipe; 7. mud scraper; 8. fertilizer box; 9. sprocket; 10. frame; 11. square steel spring; 12. fertilizer dispenser; 13. furrow opener; 14. flat steel spring; 15. sliding shoe fertilizer dispenser; 16. funnel; 17. guide tray. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] To address the drawbacks of existing fertilizer delivery devices, such as soil clogging and poor flowability, the present invention provides a disc-type fertilizer delivery device, a fertilizer application system, and a potato planter equipped with the device. The device has a compact structure, strong flowability, and is not prone to clogging. To further illustrate the structure of the present invention, a detailed description is provided below with reference to the accompanying drawings:

[0031] Example 1

[0032] See also Figure 1 and Figure 2 , see Figure 1 and Figure 2 , a disc-type fertilizer dispensing device, including a fertilizer dispenser 1. In this embodiment, the fertilizer dispenser 1 is a spiral fertilizer dispenser. The spiral fertilizer dispenser is a currently known device. It includes a fertilizer box 1-1 and a spiral feeding mechanism, and the spiral feeding structure is composed of a fertilizer dispensing shaft 1-2 and a spiral guide plate 1-3 installed on the fertilizer dispensing shaft 1-2. The upper part of the fertilizer box 1-1 is the feeding port, and the lower part of the fertilizer box 1-1 is the fertilizer dispensing port. The seed fertilizer enters the fertilizer box 1-1 from the feeding port of the fertilizer box 1-1, and the rotation of the fertilizer dispensing shaft 1-2 drives the spiral guide plate 1-3 to rotate, and the spiral guide plate 1-3 pushes the seed fertilizer out of the fertilizer dispensing port. The rotation speed of the spiral guide plate 1-3 determines the fertilizer dispensing speed of the seed fertilizer from the fertilizer dispensing port.

[0033] Compared with traditional roller fertilizer spreaders, spiral conveyor fertilizer spreaders have smoother delivery and more uniform distribution, and are widely used on potato planters.

[0034] The device also includes a fixed bracket 2. Applying fertilizer while sowing requires a fertilizer delivery device that can strictly adhere to agronomic requirements, ensuring the depth and row spacing of the fertilizer. Currently, most potato planters use a U-bolt and square tube structure to adjust the width of the fertilizer line. This row spacing adjustment method is simple in structure and easy to operate, offering significant advantages. The fixed bracket 2 connects the fertilizer delivery device to the planter and is bolted to the square tube of the planter.

[0035] The fixed bracket 2 is secured to an elastic turntable bracket 3. A fertilizer turntable 4 is mounted to the lower portion of the elastic turntable bracket 3 via a rotating shaft, allowing the turntable 4 to rotate about the axis of the rotating shaft. A fertilizer dispensing baffle 5 is mounted on one side of the turntable 4, fixed relative to the turntable. The baffle 5 is mounted on the elastic turntable bracket 3. A fertilizer dispensing channel is formed between the baffle 5 and the corresponding side of the turntable 4. The fertilizer dispensing channel is provided with a fertilizer inlet, which is connected to the fertilizer discharge port via a fertilizer pipe 6. The ends of the fertilizer pipe 6 are sealedly connected to the fertilizer discharge port of the fertilizer dispenser 1 and the fertilizer inlet on the fertilizer dispensing baffle 5, respectively, forming a sealed fertilizer dispensing path. In this embodiment, the fertilizer pipe 6 is constructed of a transparent plastic pipe with a steel wire frame. The steel wire frame prevents fertilizer accumulation in the pipe, which can bend and cause blockage. The transparent pipe facilitates visual inspection of the fertilizer inside the pipe. If fertilizer accumulation occurs, the pipe can be manually tapped to easily clear it.

[0036] Specifically, the elastic turntable bracket 3 includes a support 3-1 fixed to the fixed bracket 2. The support 3-1 is mounted on the disc bracket 3-2 via a pin arranged horizontally along the axis. The pin is fitted with a coil spring 3-3 that applies elastic force to the relative movement between the support 3-1 and the disc bracket 3-2.

[0037] In this embodiment, the disc support 3-2 is a plate frame with a half-shaft welded to one side of the lower end as the rotating shaft. The fertilizer disc 4 is mounted on the half-shaft and can rotate about the axis of the half-shaft. The support 3-1 is a plate frame, and the upper end of the disc support 3-2 is connected to the front end of the support 3-1 via a pin. The disc support 3-2 can swing about the axis of the pin. A pin stop 3-4 is welded to the side of the support 3-1 corresponding to the disc support 3-2, which is used to limit the swing angle of the disc support about the pin. The pin stop 3-4 is a raised column. The function of the pin stop 3-4 is to limit the swing angle of the disc support 3-2.

[0038] The support 3-1 is provided with a plurality of staggered circular holes, located at different circumferential positions outside the pin. The support 3-1 is provided with a rod sleeve 3-5 that fits into the staggered circular holes. Screws are inserted into the staggered circular holes and secured with matching nuts and washers. The rod sleeve 3-5 is fitted over the screws, securing the rod sleeve 3-5 in place.

[0039] A plate with a through-hole machined into it is welded to the disc support 3-2. One end of the coil spring 3-3 is inserted into this through-hole with a clearance fit. The other end of the coil spring 3-3 rests on the rod sleeve 3-5, thereby securing the coil spring 3-3 between the disc support 3-2 and the support 3-1. This ensures that the elastic force of the coil spring 3-3 is applied between the disc support 3-2 and the support 3-1. The elastic force exerted by the coil spring 3-3 on the disc support 3-2 forces the disc support 3-2 to press against the pin stop 3-4 of the support 3-1. When the disc support 3-2 rotates relative to the support 3-1, it must overcome the torsional resistance of the coil spring 3-3.

[0040] Rod sleeves 3-5 are mounted on different staggered circular holes, and the static curl of coil spring 3-3 varies. Adjusting the preload of coil spring 3-3 according to the staggered circular holes adjusts the static rigidity of elastic turntable bracket 3. When operating in different soils, the preload of coil spring 3-3 can be adjusted to achieve the desired stiffness, allowing the device to adapt its flowability to the soil's characteristics. In this embodiment, a nylon sleeve is positioned between coil spring 3-3 and the pin, which fits over the pin to ensure stable installation of coil spring 3-3.

[0041] The fertilizer dispensing baffle 5 is secured to the disc support 3-2 with bolts, nuts, and washers. A steel pipe is welded to the fertilizer inlet at the rear of the fertilizer dispensing baffle 5, connecting to the fertilizer dispensing slit. The lower end of a fertilizer pipe 6 is connected to this pipe. Fertilizer is conveyed through the pipe and then applied to the soil through the narrow fertilizer dispensing slit formed by the fertilizer dispensing baffle 5 and the fertilizer rotating disc 4.

[0042] Fixed bracket 2 is provided with several vertically spaced circular holes for mounting support 3-1. Support 3-1 is mounted to fixed bracket 2 using bolts, nuts, and washers. By connecting support 3-1 to different mounting holes on fixed bracket 2, the height of the fertilizer placement device can be adjusted to achieve the desired relative height of fertilizer and seed.

[0043] The disc bracket 3-2 is provided with a limiting groove on the rear side corresponding to the fixed bracket 2. The limiting groove limits the swing amplitude of the fertilizer rotating disc to prevent the fertilizer rotating disc 4 from hitting the fixed bracket 2 and being damaged when the coil spring 3-3 is twisted too much or breaks suddenly.

[0044] The included angle between the axis of the rotating shaft and the horizontal plane is 8°-15°. The angle design can improve the stability of the device when it is supported on the ground.

[0045] A scraper 7 is provided on one side of the fertilizer disc 4 and is fixed relative to the fertilizer disc 4. In this embodiment, the front side of the fertilizer baffle 5 is equipped with the scraper 7 by bolts, nuts and washers. The scraper 7 removes the soil stuck on the fertilizer disc 4 when the fertilizer disc rotates.

[0046] Example 2

[0047] See also Figure 3 A potato planter fertilization system includes two fertilizer boxes 8, which are containers for seed fertilizer and are mounted on the planter frame. The two fertilizer boxes 8 are symmetrically arranged on the planter. Eight sets of the disc-type fertilizer dispensing devices described in Example 1 are mounted below the fertilizer boxes 8. The eight sets of disc-type fertilizer dispensing devices form a group of fertilizer units, with the two fertilizer rotating disks 4 in each group arranged at an angle of 8.

[0048] Specifically, two fertilizer dispensers are located below and connected to each fertilizer bin 8, with four fertilizer dispensers evenly distributed horizontally below the bin 8. The fertilizer boxes 1-1 of the fertilizer dispensers 1 are directly fixed to the bottom of the bin 8. Each fertilizer box 1-1 has two fertilizer discharge ports, which are connected to the fertilizer inlets of the two fertilizer dispensing devices of the same fertilizer application unit. The fertilizer discharge shafts 1-2 of the four fertilizer dispensers 1 are connected to the same shaft, and one end of the shaft 1-2 is mounted on a sprocket 9 for transmission connection to the planter.

[0049] Example 3

[0050] See also Figure 4, provides a potato planter, the planter is equipped with the disc-type fertilizer device described in Example 1. In this embodiment, the disc-type fertilizer device is installed on the planter in the manner of the fertilization system described in Example 2.

[0051] Specifically, the potato planter comprises a frame 10, which is a square tube. A fertilizer box 8 and a fixed bracket 2 are secured to the frame 10. The planter's ground wheel drives the spiral guide plates 1-3 in the fertilizer dispenser 1 via a chain drive. Fertilizer application devices within the same fertilizer application unit are symmetrically arranged on both sides of each ridge of seed potatoes. Fertilizer is applied to the soil according to the specified row spacing and depth requirements. By replacing the sprocket 9 of the fertilizer dispenser 1 with a different number of teeth, the fertilizer discharge rate of the fertilizer dispenser 1, and thus the fertilizer discharge rate of the disc-type fertilizer application device, can be adjusted.

[0052] The fixing bracket 2 has a right-angle groove, which, together with the matching right-angle clamping plate, fixes the disc-type fertilizer device to the square tube-shaped frame 10 of the potato planter through bolts, nuts and washers. By adjusting the left and right position of the disc-type fertilizer device on the square steel, the distance between the fertilizer and the seed potato required by agronomics can be obtained.

[0053] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A disc-type fertilizer dispensing device, comprising a fertilizer dispenser (1), wherein the fertilizer dispenser (1) has a fertilizer dispensing port, and is characterized in that: The invention comprises a fixed bracket (2), an elastic turntable bracket (3) is fixed on the fixed bracket (2), a fertilizer turntable (4) is mounted on the lower part of the elastic turntable bracket (3) via a rotating shaft, a fertilizer lowering baffle (5) fixed relative to the fertilizer turntable (4) is provided on one side of the fertilizer turntable (4), the fertilizer lowering baffle (5) is mounted on the elastic turntable bracket (3), a fertilizer lowering slit is formed between the fertilizer lowering baffle (5) and the corresponding side surface of the fertilizer turntable (4), a fertilizer inlet is provided on the fertilizer lowering slit, and the fertilizer inlet is connected to the fertilizer discharge port via a fertilizer pipe (6); the fertilizer transported by the fertilizer pipe (6) is applied to the soil through the fertilizer lowering slit formed by the fertilizer lowering baffle (5) and the fertilizer turntable (4); The elastic turntable bracket (3) comprises a support (3-1) fixed to the fixed bracket (2); the support (3-1) is mounted on the disc bracket (3-2) via a pin shaft arranged horizontally with an axis; a coil spring (3-3) is sleeved on the pin shaft and applies elastic force to the relative movement between the support (3-1) and the disc bracket (3-2); The support (3-1) is provided with a plurality of staggered circular holes, the support (3-1) is provided with a rod sleeve (3-5) inserted into the staggered circular holes, and the rod sleeve (3-5) is connected to one end of the coil spring (3-3); A scraper (7) fixed relative to the fertilizing turntable (4) is provided on one side of the fertilizing turntable (4), and the scraper (7) is mounted on the elastic turntable bracket (3); The support (3-1) is welded with a pin stop portion (3-4) for limiting the swing angle of the disc bracket (3-2) around the pin shaft.

2. The disc type fertilizer application device according to claim 1, characterized in that: The disc bracket (3-2) is provided with a limiting groove on the rear side corresponding to the fixed bracket (2).

3. The disc type fertilizer application device according to claim 1, characterized in that: The included angle between the axis of the rotating shaft and the horizontal plane is 8°-15°.

4. The disc type fertilizer application device according to claim 1, characterized in that: The fixing bracket (2) is provided with a plurality of vertically distributed circular holes for mounting the support (3-1).

5. A potato planter fertilization system, characterized by: The invention comprises two fertilizer boxes (8), wherein eight sets of disc-type fertilizer-dispensing devices according to any one of claims 1 to 4 are installed at the lower part of the fertilizer boxes (8), and the eight sets of disc-type fertilizer-dispensing devices form a group of fertilizer units in pairs, and the two fertilizer rotating disks (4) in the same group of fertilizer units are arranged at an angle of eight.

6. A potato planter, characterized in that: The seed drill is equipped with the disc-type fertilizer application device according to any one of claims 1 to 4.

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