Sweet potato seedling cultivation device

Abstract

The invention relates to the technical field of seedling cultivation, in particular to a sweet potato seedling cultivation device. Comprising a bottom cylinder and cultivation cylinders. The device is provided with a compound motion mechanism driven by a single driving motor through a bevel gear set, the compound motion mechanism drives a rotating disc to revolve, and through meshing of a driving wheel and a driven wheel, a cultivation barrel rotates while revolving, and all-dimensional uniform illumination is provided for seedlings. The irrigation system adopts a mechanical weighing trigger mechanism, a lever is driven by the weight change of a matrix in a cultivation barrel, opening and closing of a diaphragm valve are controlled in a linkage mode, and accurate irrigation according to needs is achieved. The water and fertilizer supply system integrates a fertilizer pump and a venturi mixer, automatically sucks and mixes fertilizer liquid through negative pressure of irrigation water flow, and achieves water and fertilizer integrated synchronous supply. The system is high in integration level, realizes organic combination of illumination optimization, self-adaptive irrigation and efficient water and fertilizer management, and is beneficial to growth of sweet potato seedlings.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seedling cultivation, and particularly relates to a sweet potato seedling cultivation device. BACKGROUND

[0002] Sweet potato is a high-yield and strong-adaptability food crop, which is closely related to industrial and agricultural production and people's life. In addition to being used as staple food, the tuber is also an important raw material for food processing, starch and alcohol manufacturing industry. The root, stem and leaf are also excellent forage.

[0003] Traditional sweet potato seedling cultivation methods usually have problems such as uneven light, low water and fertilizer management efficiency, which affect the healthy growth and uniformity of seedlings. Therefore, it has important practical significance to develop a sweet potato seedling cultivation device that can realize precise and efficient cultivation. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art and provide a sweet potato seedling cultivation device that can realize omnidirectional uniform light, self-adaptive precise irrigation and efficient water and fertilizer integrated supply.

[0005] The technical scheme adopted by the present application is as follows: a sweet potato seedling cultivation device, comprising a bottom cylinder and a cultivation cylinder, further comprising a self-adaptive irrigation mechanism, a U-shaped seat is installed at the bottom of the bottom cylinder, a drive motor is arranged on one side of the U-shaped seat, a drive bevel gear is arranged at the output end of the drive motor, bevel gears one and two are coaxially arranged at the upper and lower ends of the U-shaped seat, the bevel gears one and two are both meshed and connected with the drive bevel gear, so as to realize the coaxial reverse rotation of the bevel gears one and two, a hollow shaft is axially arranged on the bevel gear one, a driving wheel is arranged on the hollow shaft, a central rotating shaft is axially arranged on the bevel gear two, the central rotating shaft is arranged in the hollow shaft, a rotating disc is fixed at the top of the central rotating shaft, at least three through grooves are circumferentially distributed on the rotating disc, a lifting cylinder that is rotationally connected with the rotating disc is arranged in each through groove, the cultivation cylinder is arranged in the lifting cylinder, a driven wheel is arranged at the bottom of the lifting cylinder, the driven wheel is meshed and connected with the driving wheel, when the rotating disc revolves around the central rotating shaft, the cultivation cylinder is driven to rotate around its own axis. The self-adaptive irrigation mechanism comprises a weighing trigger mechanism arranged on one side of the cultivation cylinder and a diaphragm valve responsive to the weighing trigger mechanism; the weighing trigger mechanism converts the weight change of the substrate in the cultivation cylinder into mechanical displacement to trigger or close the diaphragm valve.

[0006] Further, the weighing trigger mechanism comprises a weighing tray arranged outside the cultivation cylinder, a rotating seat fixed on the rotating disc, and a lever and a connecting rod rotatably arranged on the rotating seat, a torsion spring is arranged on the hinge shaft of the rotating seat and the lever, one end of the lever close to the cultivation cylinder abuts against the bottom of the weighing tray, the torsion spring makes the lever keep a tendency of lifting the cultivation cylinder upward, a valve rod is arranged on the diaphragm valve, a connecting seat is arranged at the bottom of the valve rod, a reset spring is arranged between the connecting seat and the diaphragm valve, one end of the connecting rod is rotatably connected with the connecting seat, and the other end is rotatably connected with the lever far away from the cultivation cylinder, so that when the substrate becomes lighter, the weighing tray is lifted upward under the action of the torsion spring, the lever is pressed downward, the connecting rod pulls the valve rod to open the diaphragm valve, and irrigation is started; after irrigation, the substrate becomes heavier, the weighing tray sinks, the lever is reset, and the reset spring closes the diaphragm valve.

[0007] Further, a high-position water storage tank is further arranged, the high-position water storage tank is arranged on the rotating disc through a supporting inclined pipe, a water supply main pipe is arranged at the bottom of the high-position water storage tank, the water supply main pipe is connected with a plurality of water supply branch pipes corresponding to the cultivation cylinders, and the diaphragm valve is arranged on the water supply branch pipe.

[0008] Further, a fertilizer pump is further arranged above the middle part of the rotating disc, the fertilizer pump comprises a pump body, a piston slidingly and sealingly matched in the pump body, a piston rod connected with the piston, a pressing plate located at the end of the piston rod, and an inlet one-way valve and an outlet one-way valve, the inlet one-way valve is connected with the fertilizer concentrate tank through a pipeline, and the outlet one-way valve is connected with the water supply main pipe through a pipeline.

[0009] Further, a reset compression spring is sleeved on the piston rod, one end of the reset compression spring abuts against the end cover of the pump body, and the other end abuts against the piston, a pressing ball is arranged at the bottom of the end of the lever far away from the cultivation cylinder, when the cultivation cylinder rises, the pressing ball presses the pressing plate to drive the piston to pull down and complete the liquid suction process, and when the cultivation cylinder descends, the reset compression spring resets to supplement the fertilizer liquid into the water supply main pipe.

[0010] Further, the outlet one-way valve of the fertilizer pump is connected with a fertilizer distribution tank through a pipeline, a Venturi mixer is arranged on the water supply main pipe and comprises a converging pipe section and a diffuser pipe section in sequence, the converging pipe section is connected with the water supply main pipe, a negative pressure suction pipe is arranged on the side wall of the diffuser pipe section, the negative pressure suction pipe is connected with the fertilizer distribution tank, and the outlet of the diffuser pipe section is connected with the water supply branch pipe.

[0011] Further, a guide groove is arranged outside the cultivation cylinder, a guide strip is arranged in the lifting cylinder, and the cultivation cylinder is slidingly connected in the lifting cylinder in cooperation with the guide strip and the guide groove.

[0012] Furthermore, a roller groove is provided inside the through groove and on the outside of the lifting cylinder, and a ball is provided in the roller groove to reduce the friction when the lifting cylinder rotates.

[0013] Furthermore, a lifting ball is provided at one end of the lever near the cultivation cylinder, and the lifting ball abuts against the weighing tray.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. A combined revolution and rotation motion is formed, ensuring that all seedlings receive uniform light from all directions. The drive motor drives the rotating disk to revolve through bevel gear transmission, while the meshing of the driving and driven wheels causes the cultivation cylinder installed inside the lifting cylinder to rotate. This ensures that each seedling receives light from all directions at different times, avoiding blind spots and promoting uniform seedling growth.

[0015] 2. Each cultivation unit is equipped with an independent weighing trigger mechanism, which converts changes in the weight of the substrate within the cultivation cylinder into mechanical displacement to trigger or close the diaphragm valve. This design enables independent and precise irrigation for each cultivation unit. When the substrate in the cultivation cylinder becomes lighter due to evaporation or seedling absorption, the weighing tray shifts, driving the diaphragm valve to open via levers and connecting rods, thus initiating irrigation. When the substrate absorbs water and becomes heavier, the weighing tray returns to its original position, and the diaphragm valve closes, preventing over-irrigation.

[0016] 3. A measured amount of concentrated fertilizer solution is pumped into the Venturi tube and mixed with the irrigation water in real time. This achieves "fertilizer application whenever there is water, and fertilization stops when water stops." The concentrated fertilizer solution is injected into the Venturi mixer in the main water supply pipe via a fertilizer pump. The negative pressure generated by the water flow draws in the fertilizer solution, which is then thoroughly mixed with the irrigation water before being delivered to the cultivation cylinder. This design ensures fertilization during irrigation, and the fertilizer concentration is directly proportional to the water volume, achieving "water-fertilizer linkage," improving fertilizer utilization, and avoiding fertilizer waste and damage to seedlings.

[0017] 4. The entire device is driven mainly by a single drive motor, which enables the seedlings to revolve, rotate, be weighed, and receive water and fertilizer, thus simplifying the control system. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the bottom cylinder; Figure 3 Schematic diagram of the mating structure of the main gear and driven gear; Figure 4 This is a schematic diagram of the adaptive irrigation mechanism. Figure 5 for Figure 4 Enlarged schematic diagram of section A in the middle; Figure 6 This is a schematic diagram of a Venturi mixer. Figure 7 This is a schematic diagram of the internal structure of a fertilizer pump; Figure 8 This is a schematic diagram showing the positions of the pressure ball and the tablet. Figure 9 This is a schematic diagram of the cultivation cylinder and the lifting cylinder structure; Figure 10 This is a schematic diagram of the internal structure of the through-slot.

[0019] In the diagram: 10-Bottom cylinder; 11-U-shaped seat; 12-Drive motor; 13-Drive bevel gear; 14-Bevel gear one; 15-Bevel gear two; 16-Hollow shaft; 17-Drive wheel; 18-Central rotating shaft; 19-Rotating disc; 20-Cultivation cylinder; 21-Through groove; 22-Lifting cylinder; 23-Driven wheel; 24-Diaphragm valve; 25-Weighing tray; 26-Rotating seat; 27-Lever; 28-Connecting rod; 29-Valve stem; 30-Connecting seat; 31-Reset spring; 32-High-level water storage tank 33-Supporting inclined pipe; 34-Main water supply pipe; 35-Branch water supply pipe; 36-Pump body; 37-Piston; 38-Piston rod; 39-Pressure plate; 40-Inlet check valve; 41-Outlet check valve; 42-Fertilizer concentrate tank; 43-Reset spring; 44-Pressing ball; 45-Fertilizer mixing tank; 46-Venturi mixer; 47-Contraction section; 48-Diffuser section; 49-Negative pressure suction pipe; 50-Guide groove; 51-Guide strip; 52-Roller groove; 53-Ball; 54-Lifting ball. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] As shown in the figure, a sweet potato seedling cultivation device includes a bottom cylinder 10 and a cultivation cylinder 20.

[0022] A U-shaped seat 11 is installed at the bottom of the bottom cylinder 10, and a drive motor 12 is provided on one side of the U-shaped seat 11. The output end of the drive motor 12 is connected to the drive bevel gear 13.

[0023] The upper and lower ends of the U-shaped base 11 are coaxially equipped with bevel gear 14 and bevel gear 15. Drive bevel gear 13 is meshed with both bevel gear 14 and bevel gear 15. Through a reasonable design, drive motor 12 drives drive bevel gear 13 to rotate, thereby causing bevel gear 14 and bevel gear 15 to rotate coaxially in opposite directions. This coaxial counter-rotation design is for driving the subsequent revolution and rotation mechanisms.

[0024] A hollow shaft 16 is axially arranged on the bevel gear 14. A drive wheel 17 is fixedly connected to the hollow shaft 16.

[0025] A central rotating shaft 18, coaxial with the hollow shaft 16, passes through the interior of the hollow shaft 16. A rotating disk 19 is fixedly connected to the top of the central rotating shaft 18.

[0026] At least three through slots 21 are evenly distributed along the circumference of the rotating disk 19. A lifting cylinder 22 is provided in each through slot 21, and the lifting cylinder 22 is rotatably connected to the rotating disk 19.

[0027] A driven wheel 23 is provided at the bottom of the lifting cylinder 22. The driven wheel 23 is engaged with the driving wheel 17.

[0028] When the drive motor 12 operates, it drives the drive bevel gear 13 to rotate, which in turn drives bevel gear 14 and bevel gear 15 to rotate coaxially and in opposite directions. Bevel gear 14 drives the hollow shaft 16 and its drive wheel 17 to rotate. Bevel gear 15 drives the central rotating shaft 18 and its rotating disk 19 to rotate. The rotation of the drive wheel 17, through meshing with the driven wheel 23, drives the bottom of the lifting cylinder 22 to rotate. Since the lifting cylinder 22 is installed in the through groove 21 of the rotating disk 19, the rotation of the lifting cylinder 22 is actually around its own axis, thereby driving the cultivation cylinder 20 to rotate around its own axis.

[0029] Meanwhile, the rotating disk 19 revolves around the central rotating shaft 18, which is fixed in place. Therefore, the cultivation cylinder 20 achieves a combined motion of revolution and rotation.

[0030] The adaptive irrigation mechanism includes a weighing trigger mechanism disposed on one side of the cultivation cylinder 20, and a diaphragm valve 24 that responds to the weighing trigger mechanism. The weighing trigger mechanism converts the weight change of the substrate inside the cultivation cylinder 20 into mechanical displacement to trigger or close the diaphragm valve 24.

[0031] The weighing triggering mechanism includes a weighing tray 25 disposed on the outside of the cultivation cylinder 20. The weighing tray 25 can be placed directly at the bottom of the cultivation cylinder 20, or connected to the cultivation cylinder 20 via a bracket.

[0032] A rotating seat 26 is fixed on the rotating disk 19. A lever 27 is rotatably mounted on the rotating seat 26. A torsion spring is mounted on the hinge axis between the lever 27 and the rotating seat 26.

[0033] The end of lever 27 near the cultivation cylinder 20 is abutted against the bottom of the weighing tray 25 via a lifting ball 54. The torsion spring causes lever 27 to tend to lift the weighing tray 25 upward, thereby lifting the cultivation cylinder 20 upward.

[0034] A valve stem 29 is provided on the diaphragm valve 24. A connecting seat 30 is provided at the bottom of the valve stem 29. A return spring 31 is provided between the connecting seat 30 and the diaphragm valve 24 for closing the diaphragm valve after the external force is removed.

[0035] One end of the connecting rod 28 is rotatably connected to the connecting seat 30, and the other end is rotatably connected to the end of the lever 27 away from the cultivation cylinder 20.

[0036] Its working principle is as follows: When the substrate inside the cultivation cylinder 20 becomes lighter due to evaporation or absorption by the seedlings, the weighing tray 25 tilts upward under the action of the torsion spring. At this time, the proximal end of the lever 27 is lifted, while the end away from the cultivation cylinder 20 is pressed downward. The connecting rod 28 is pulled, thereby pulling the valve stem 29 downward, opening the diaphragm valve 24, and initiating irrigation.

[0037] After irrigation is complete, the weight of the substrate increases, and the weighing tray 25 sinks due to downward pressure. The lever 27 resets, and the end away from the cultivation cylinder 20 rises upward. At this time, the return spring 31 pushes the valve stem 29 upward, closing the diaphragm valve 24 and stopping irrigation.

[0038] The present invention may also include a high-level water storage tank 32. The high-level water storage tank 32 is mounted on the rotating disk 19 via a supporting inclined tube 33 and moves together with the rotating disk 19 as it revolves.

[0039] A main water supply pipe 34 is installed at the bottom of the elevated water storage tank 32. The main water supply pipe 34 is connected to several branch water supply pipes 35 corresponding to the cultivation cylinders 20. A diaphragm valve 24 is installed on each branch water supply pipe 35 to control the irrigation of each cultivation cylinder 20.

[0040] To achieve integrated water and fertilizer management, this invention also includes a fertilizer pump positioned above the center of the rotating disk 19. The fertilizer pump includes a pump body 36, a piston 37 slidingly sealed within the pump body 36, a piston rod 38 connecting to the piston 37, and a pressure plate 39 located at the end of the piston rod 38. The fertilizer pump also has an inlet check valve 40 and an outlet check valve 41. The inlet check valve 40 is connected to a fertilizer concentrate tank 42 via a pipeline. The outlet check valve 41 is connected to a main water supply pipe 34 via a pipeline. A return spring 43 is fitted onto the piston rod 38. One end of the return spring 43 abuts against the end cap of the pump body 36, and the other end abuts against the piston 37. A pressure ball 44 is located at the bottom of the end of the lever 27 furthest from the cultivation cylinder 20.

[0041] As the cultivation cylinder 20 rises due to the reduced substrate weight, it simultaneously drives the lifting cylinder 22 and the cultivation cylinder 20 as a whole to move upwards. At this time, the end of the lever 27 closest to the cultivation cylinder 20 is lifted by the weighing tray 25, pressing down on the end furthest from the cultivation cylinder 20. The pressure ball 44 also presses down, compressing the piston rod 38 and its pressure plate 39. The piston 37 moves downwards under the action of the piston rod 38, completing the liquid suction process and drawing the fertilizer concentrate from the fertilizer concentrate tank 42 into the pump body 36 through the inlet check valve 40.

[0042] When irrigation ends, the substrate becomes heavier, lever 27 resets, and the end furthest from cultivation cylinder 20 rises upward. At this time, reset spring 43 pushes piston 37 and piston rod 38 upward. Piston 37 moves upward, pushing the fertilizer solution in pump body 36 into water supply main pipe 34 through outlet check valve 41.

[0043] To achieve more uniform water and fertilizer mixing, the fertilizer pump's outlet check valve 41 is connected to the fertilizer mixing tank 45 via a pipeline. A Venturi mixer 46 is installed on the main water supply pipe 34. The Venturi mixer 46 includes a contraction section 47 and a diffusion section 48.

[0044] The contraction pipe section 47 is connected to the main water supply pipe 34. A negative pressure suction pipe 49 is installed on the side wall of the diffuser pipe section 48. The negative pressure suction pipe 49 is connected to the fertilizer mixing tank 45. The outlet of the diffuser pipe section 48 is connected to the water supply branch pipe 35.

[0045] When irrigation water flows through the Venturi mixer 46, the flow velocity increases and the pressure decreases at the contraction section 47, creating a negative pressure. This negative pressure acts on the fertilizer mixing tank 45 through the negative pressure suction pipe 49, drawing in the fertilizer solution and mixing it thoroughly with the irrigation water. The solution then flows from the outlet of the diffuser section 48 into the water supply branch pipe 35 and is delivered to the cultivation cylinder 20. This achieves integrated water and fertilizer management, ensuring that "fertilizer is available whenever there is water, and fertilization stops when water is cut off."

[0046] To ensure stable movement of the cultivation cylinder 20 within the lifting cylinder 22, a guide groove 50 is provided on the outer side of the cultivation cylinder 20. A guide strip 51 is provided on the inner side of the lifting cylinder 22. The cultivation cylinder 20 is slidably connected within the lifting cylinder 22 through the cooperation of the guide strip 51 and the guide groove 50.

[0047] To reduce the friction when the lifting cylinder 22 rotates within the through groove 21 of the rotating disk 19, a roller groove 52 is provided between the inside of the through groove 21 and the outside of the lifting cylinder 22, and a ball bearing 53 is provided within the roller groove 52. Thus, when the lifting cylinder 22 rotates, the ball bearing 53 rolls within the roller groove 52, greatly reducing friction and improving transmission efficiency.

Claims

1. A sweet potato seedling cultivation device, comprising a bottom cylinder (10) and a cultivation cylinder (20), characterized in that: It also includes an adaptive irrigation mechanism. A U-shaped seat (11) is installed at the bottom of the bottom cylinder (10). A drive motor (12) is provided on one side of the U-shaped seat (11). A drive bevel gear (13) is provided at the output end of the drive motor (12). A bevel gear one (14) and a bevel gear two (15) are coaxially provided at the upper and lower ends of the U-shaped seat (11). Both the bevel gear one (14) and the bevel gear two (15) are meshed with the drive bevel gear (13) to realize the coaxial and opposite rotation of the bevel gear one (14) and the bevel gear two (15). A hollow shaft (16) is axially provided on the bevel gear one (14). A drive wheel (17) is provided on the hollow shaft (16). A drive wheel (17) is axially provided on the bevel gear two (15). A central rotating shaft (18) is provided, which passes through the hollow shaft (16). A rotating disk (19) is fixed on the top of the central rotating shaft (18). At least three through slots (21) are distributed around the circumference of the rotating disk (19). Each through slot (21) is provided with a lifting cylinder (22) that is rotatably connected to the rotating disk (19). The cultivation cylinder (20) is located in the lifting cylinder (22). Each lifting cylinder (22) is provided with a driven wheel (23) at the bottom. The driven wheel (23) is meshed with the driving wheel (17). When the rotating disk (19) revolves around the central rotating shaft (18), it drives the cultivation cylinder (20) to rotate around its own axis. The adaptive irrigation mechanism includes a weighing trigger mechanism disposed on one side of the cultivation cylinder (20) and a diaphragm valve (24) that responds to the weighing trigger mechanism; the weighing trigger mechanism converts the weight change of the substrate in the cultivation cylinder (20) into mechanical displacement to trigger or close the diaphragm valve (24).

2. The sweet potato seedling cultivation device according to claim 1, characterized in that: The weighing triggering mechanism includes a weighing tray (25) disposed on the outside of the cultivation cylinder (20), a rotating seat (26) fixed on the rotating disk (19), and a lever (27) and a connecting rod (28) rotatably disposed on the rotating seat (26). A torsion spring is disposed on the hinge axis between the lever (27) and the rotating seat (26). One end of the lever (27) near the cultivation cylinder (20) abuts against the bottom of the weighing tray (25). The torsion spring causes the lever (27) to maintain the tendency to lift the cultivation cylinder (20) upward. A valve stem (29) is disposed on the diaphragm valve (24). The bottom of the valve stem (29) The unit is provided with a connecting seat (30), and a return spring (31) is provided between the connecting seat (30) and the diaphragm valve (24). One end of the connecting rod (28) is rotatably connected to the connecting seat (30), and the other end is rotatably connected to the end of the lever (27) away from the cultivation cylinder (20). When the substrate becomes lighter, the weighing tray (25) tilts upward under the action of the torsion spring, driving the lever (27) to press down. The connecting rod (28) pulls the valve rod (29) to open the diaphragm valve (24) and start irrigation. After irrigation, the substrate becomes heavier, the weighing tray (25) sinks, the lever (27) returns to its original position, and the return spring (31) closes the diaphragm valve (24).

3. The sweet potato seedling cultivation device according to claim 1, characterized in that: It also includes a high-level water storage tank (32), which is installed on the rotating disk (19) by a support inclined pipe (33). A water supply main pipe (34) is provided at the bottom of the high-level water storage tank (32), and the water supply main pipe (34) is connected to several water supply branch pipes (35) corresponding to the cultivation cylinder (20). The diaphragm valve (24) is provided on the water supply branch pipe (35).

4. The sweet potato seedling cultivation device according to claim 3, characterized in that: It also includes a fertilizer pump located above the center of the rotating disk (19). The fertilizer pump includes a pump body (36), a piston (37) that is slidably sealed within the pump body (36), a piston rod (38) that connects to the piston (37), a pressure plate (39) located at the end of the piston rod (38), an inlet check valve (40), and an outlet check valve (41). The inlet check valve (40) is connected to the fertilizer concentrate tank (42) via a pipeline, and the outlet check valve (41) is connected to the main water supply pipe (34) via a pipeline.

5. The sweet potato seedling cultivation device according to claim 4, characterized in that: A reset spring (43) is fitted on the piston rod (38). One end of the reset spring (43) abuts against the end cap of the pump body (36), and the other end abuts against the piston (37). A pressure ball (44) is provided at the bottom of the end of the lever (27) away from the cultivation cylinder (20). When the cultivation cylinder (20) rises, the pressure ball (44) presses down the pressure plate (39), which drives the piston (37) to pull down to complete the liquid absorption process. When the cultivation cylinder (20) falls, the reset spring (43) resets and replenishes the fertilizer liquid into the water supply main pipe (34).

6. The sweet potato seedling cultivation device according to claim 5, characterized in that: The outlet check valve (41) of the fertilizer pump is connected to the fertilizer mixing tank (45) through a pipeline. A Venturi mixer (46) is provided on the main water supply pipe (34), which includes a shrinkage pipe section (47) and a diffuser pipe section (48) in sequence. The shrinkage pipe section (47) is connected to the main water supply pipe (34). A negative pressure suction pipe (49) is provided on the side wall of the diffuser pipe section (48). The negative pressure suction pipe (49) is connected to the fertilizer mixing tank (45). The outlet of the diffuser pipe section (48) is connected to the water supply branch pipe (35).

7. The sweet potato seedling cultivation device according to claim 1, characterized in that: The cultivation cylinder (20) has a guide groove (50) on its outer side, and the lifting cylinder (22) has a guide strip (51) inside. The cultivation cylinder (20) is slidably connected to the lifting cylinder (22) through the guide strip (51) and the guide groove (50).

8. The sweet potato seedling cultivation device according to claim 1, characterized in that: The inside of the through groove (21) and the outside of the lifting cylinder (22) are provided with roller grooves (52), and ball bearings (53) are provided in the roller grooves (52) to reduce the friction when the lifting cylinder (22) rotates.

9. The sweet potato seedling cultivation device according to claim 1, characterized in that: The lever (27) is provided with a lifting ball (54) at one end near the cultivation cylinder (20), and the lifting ball (55) abuts against the weighing tray (25).

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