A surrounding type seedling drip irrigation device suitable for different diameters

Abstract

The application discloses a kind of different caliber encircling type seedling drip irrigation device, belong to drip irrigation technical field.The application of a kind of different caliber encircling type seedling drip irrigation device, including culture pot, culture pot is filled with culture soil, culture soil top is equipped with by a plurality of connecting rod assembly first and last hinged formation annular connecting rod structure, annular connecting rod structure encircles seedling main stem;Connecting rod assembly bottom is passed in and is equipped with drip irrigation branch pipe by limiting ring band, drip irrigation branch pipe includes first drip irrigation branch pipe and second drip irrigation branch pipe, first drip irrigation branch pipe and second drip irrigation branch pipe are alternately inserted in the limiting ring band of adjacent connecting rod assembly along annular connecting rod structure, form the irrigation ring area that can be expanded synchronously with annular connecting rod structure expansion and contraction.The application solves the problems, such as irrigation area static, low water use efficiency, root system regulation loss in existing drip irrigation technology.The application can dynamically adjust irrigation range, accurately match root growth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drip irrigation, in particular to a surrounding type seedling drip irrigation device suitable for different diameters. BACKGROUND

[0002] The current drip irrigation technology has been widely used in the field of agricultural seedling cultivation, but there are still some key problems to be solved in the context of seedling cultivation.

[0003] The diameter of the drip irrigation ring cannot be dynamically adjusted with the expansion of the seedling root system, resulting in a mismatch between the irrigation area and the root growth range. Tests show that the average daily expansion speed of tomato seedling roots during the growth period is 0.8-1.2 cm, and the fixed radius of the traditional drip irrigation ring will cause 30% of the irrigation water to act on the invalid area, resulting in waste of water resources; the same drip irrigation ring is difficult to adapt to different diameters of seedling stems, and when the stem diameter is greater than the inner diameter of the drip irrigation ring, the installation process is easy to damage the young stems; when the stem diameter is less than the inner diameter, the drip irrigation ring cannot be stably fixed, resulting in irrigation deviation. The traditional drip irrigation head is directly exposed to the air, especially in the high-temperature environment of the greenhouse, and the water evaporation loss rate is as high as 22%-28%. And the existing technology uses uniformly distributed drippers, but does not consider the hydrotaxis characteristics of seedling root growth. When the roots grow concentrated on one side, this area is prone to root rot (the incidence rate increases by 15%-20%) due to excessive water, while the other side is inhibited due to insufficient water supply. SUMMARY

[0004] The purpose of the present application is to provide a surrounding type seedling drip irrigation device suitable for different diameters, which can dynamically adjust the irrigation range and accurately match the root growth, solving the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A surrounding type seedling drip irrigation device suitable for different diameters, comprising a culture pot, the culture pot is filled with culture soil, and an annular link structure formed by a plurality of link assemblies hingedly connected at the head and tail is arranged above the culture soil, and the annular link structure surrounds the main stem of the seedling; a drip irrigation sub-pipe is arranged through the limiting ring belt at the bottom of the link assembly, the drip irrigation sub-pipe comprises a first drip irrigation sub-pipe and a second drip irrigation sub-pipe, the first drip irrigation sub-pipe and the second drip irrigation sub-pipe are alternately inserted into the limiting ring belt of the adjacent link assembly along the annular link structure, forming a irrigation ring area which can expand synchronously with the expansion of the annular link structure;

[0007] The bottom of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe is arranged with a drip irrigation port, the diameter of the drip irrigation port is 0.5-0.8 mm, and a support cover is arranged outside the drip irrigation port, the support cover is a vertical inverted conical structure, the inside of the support cover is a hollow structure and is through from top to bottom, and the first drip irrigation sub-pipe and the second drip irrigation sub-pipe are supported on the surface of the culture soil through the support cover.

[0008] Preferably, the connecting rod assembly consists of a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod to form a rhombus four-connecting rod structure, wherein the first connecting rod and the second connecting rod are hinged by a first short connecting shaft, the third connecting rod and the fourth connecting rod are hinged by a second short connecting shaft, the first connecting rod and the fourth connecting rod are hinged by a long connecting shaft, and the second connecting rod and the third connecting rod of the adjacent connecting rod assembly are connected by a long connecting shaft.

[0009] Each of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod is provided with a drip irrigation port.

[0010] Preferably, the limiting ring belt includes a first limiting ring belt, a second limiting ring belt and a third limiting ring belt, the first limiting ring belt is fixed to the bottom end of the first short connecting shaft, the second limiting ring belt is fixed to the bottom end of the second short connecting shaft, and the third limiting ring belt is fixed to the bottom end of the long connecting shaft.

[0011] The first drip irrigation sub-pipe and the second drip irrigation sub-pipe cross through the third limiting ring belt of the adjacent connecting rod assembly and are alternately arranged in the first limiting ring belt and the second limiting ring belt.

[0012] Preferably, the bottom end of the support cover is in contact with the surface of the culture soil, and a protective net is arranged at the bottom opening of the support cover, the protective net is a 150-200 mesh stainless steel filter screen, and the height of the support cover is 40-50 mm.

[0013] Preferably, the culture pot is provided with two groups of positioning assemblies along the pot and is rotationally symmetrical, each group of positioning assemblies includes an L-shaped clamping plate, a movable clamping plate and an adjusting rod, the L-shaped clamping plate and the movable clamping plate are matched to form an inverted U-shaped structure, the L-shaped clamping plate and the movable clamping plate are clamped to the pot along, the top of the L-shaped clamping plate is provided with a mounting groove, a screw rod is horizontally arranged in the mounting groove, the top of the movable clamping plate penetrates into the mounting groove and is threadedly connected with the screw rod, the movable clamping plate and the L-shaped clamping plate are slidingly connected, and the end of the screw rod penetrates out of the L-shaped clamping plate and is connected with a first knob.

[0014] Preferably, the top of the L-shaped clamping plate is fixed with a connecting column, one end of the connecting column is rotationally connected with the adjusting rod, the other end of the adjusting rod is rotationally connected with the first short connecting shaft, and the outer wall of the top of the connecting column is provided with an external thread, and the connecting column is rotationally connected with a second knob provided with an internal thread.

[0015] Preferably, the water inlet and the water outlet of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe are provided with a clamping joint, the first drip irrigation sub-pipe and the second drip irrigation sub-pipe are connected with the total drip irrigation pipe through the clamping joint, a double O-shaped rubber sealing ring is embedded in the clamping joint, and the outer diameter tolerance is controlled within ±0.1 mm.

[0016] Preferably, the total drip irrigation pipe is a segmented water pipe, one end of each total drip irrigation pipe is connected with the water outlets of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe, and the other end is connected with the water inlets of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe arranged in the adjacent culture pot.

[0017] Preferably, one end of the total drip irrigation pipe is connected with a booster water pump and a water tank, and a pressure sensor and a PID controller are installed.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] 1、The application can adjust the diameter of the irrigation ring area according to the change of the root growth area of the seedling, so that the irrigation water can accurately penetrate to the end of the root growth, and through the periodic expansion of the irrigation ring area, the seedling root system is forced to extend outward, so that the effective absorption area volume is increased by 35-55%, the root crown ratio is increased by more than 50%, the ring form drip irrigation can avoid the problem of one-way development of the root system caused by the traditional drip irrigation technology, and the water capture capacity and the anti-lodging capacity of the plant are significantly enhanced.

[0020] 2、The application adopts a drip irrigation strategy of dynamically matching the root system position, reduces the invalid irrigation area, saves water by 28-35% compared with the traditional ring irrigation, increases the fertilizer utilization rate from 61% to 83%, and reduces the salinization risk.

[0021] 3、The application supports the connecting rod assembly and the first and second drip irrigation sub-pipes on the surface of the culture soil through the support cover, so as to facilitate the drip irrigation operation of the seedling, avoids that the small drip irrigation ports are blocked by the soil due to direct contact with the culture soil, the water drops flowing out of the drip irrigation ports penetrate into the culture soil after flowing through the support cover, the support cover avoids that the water drops are directly exposed to the external air, greatly reduces the evaporation of water, and improves the irrigation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is an overall structure isometric view of the application;

[0023] Figure 2 is an internal structure isometric view of the culture pot of the application;

[0024] Figure 3 is a schematic view of the connecting rod assembly in a retracted state of the application;

[0025] Figure 4 is a schematic view of the connecting rod assembly driving the expansion of the drip irrigation sub-pipe of the application;

[0026] Figure 5 is a schematic view of part of the connecting rod assembly of the application;

[0027] Figure 6 is a longitudinal section view of the support cover of the application;

[0028] Figure 7 is a cross-sectional view of the positioning assembly of the application.

[0029] In the figure: 1, culture pot; 11, culture soil; 12, seedling; 2, connecting rod assembly; 21, first connecting rod; 22, second connecting rod; 23, third connecting rod; 24, fourth connecting rod; 25, first short connecting shaft; 26, second short connecting shaft; 27, long connecting shaft; 3, drip irrigation branch pipe; 31, first drip irrigation branch pipe; 32, second drip irrigation branch pipe; 33, drip irrigation port; 4, limiting ring belt; 41, first limiting ring belt; 42, second limiting ring belt; 43, third limiting ring belt; 5, support cover; 51, protective net; 6, positioning assembly; 61, L-shaped clamping plate; 62, moving clamping plate; 63, adjusting rod; 64, mounting groove; 65, screw rod; 66, first knob; 67, connecting column; 68, second knob; 7, irrigation ring area; 8, total drip irrigation pipe; 81, clamping joint; 9, water tank. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] In order to solve the problems of static irrigation area, low water use efficiency, lack of root regulation, and water resource waste and prolonged seedling period in the existing drip irrigation technology, please refer to Figures 1-7 The technical solutions of the present embodiment are as follows:

[0032] A surrounding type seedling drip irrigation device suitable for different diameters comprises a culture pot 1, culture soil 11 is filled in the culture pot 1, seedlings 12 are planted at the center of the culture soil 11, a connecting rod assembly 2 is arranged above the culture soil 11, a plurality of connecting rod assemblies 2 are arranged in series to form a ring-shaped connecting rod structure, the main stems of the seedlings 12 are surrounded by the ring-shaped connecting rod structure, drip irrigation branch pipes 3 are arranged below the connecting rod assembly 2, the drip irrigation branch pipes 3 are connected with the connecting rod assembly 2 through limiting ring belts 4, and the area surrounded by the drip irrigation branch pipes 3 forms an irrigation ring area 7. The diameter of the irrigation ring area 7 can be adjusted according to the change of the root growth area of the seedlings, so that the irrigation water can accurately penetrate to the end of the root growth.

[0033] The connecting rod assembly 2 comprises a first connecting rod 21, a second connecting rod 22, a third connecting rod 23 and a fourth connecting rod 24, the lengths of the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24 are the same, the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24 are sequentially hinged at the ends to form a rhombus connecting rod structure, the ends of the first connecting rod 21 and the second connecting rod 22 are hinged through a first short connecting shaft 25, the ends of the third connecting rod 23 and the fourth connecting rod 24 are hinged through a second short connecting shaft 26, the ends of the first connecting rod 21 and the fourth connecting rod 24 are hinged through a long connecting shaft 27, and the ends of the second connecting rod 22 and the third connecting rod 23 are hinged with the adjacent first connecting rod 21 and the fourth connecting rod 24 through the long connecting shaft 27.

[0034] The limiting ring belt 4 comprises a first limiting ring belt 41, a second limiting ring belt 42 and a third limiting ring belt 43, the first limiting ring belt 41 is fixed to the bottom end of the first short connecting shaft 25, the second limiting ring belt 42 is fixed to the bottom end of the second short connecting shaft 26, and the third limiting ring belt 43 is fixed to the bottom end of the long connecting shaft 27.

[0035] The drip irrigation submain comprises a first drip irrigation submain 31 and a second drip irrigation submain 32, and the first drip irrigation submain 31 and the second drip irrigation submain 32 are arranged around the positions directly below the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24.

[0036] The first drip irrigation submain 31 and the second drip irrigation submain 32 are first inserted into the third limiting ring belt 43 in opposite directions, then are dispersed in a cross manner, the first drip irrigation submain 31 penetrates the first limiting ring belt 41, the second drip irrigation submain 32 penetrates the second limiting ring belt 42, then the first drip irrigation submain 31 and the second drip irrigation submain 32 meet and are inserted into the third limiting ring belt 43 of the adjacent connecting rod assembly 2 in opposite directions, then are dispersed in a cross manner again, the first drip irrigation submain 31 penetrates the second limiting ring belt 42 of the adjacent connecting rod assembly 2, the second drip irrigation submain 32 penetrates the first limiting ring belt 41, then meets and is inserted into the third limiting ring belt 43 of the next connecting rod assembly 2 in opposite directions, and the above process is repeated until the first drip irrigation submain 31 and the second drip irrigation submain 32 are arranged around and are taken out from the third limiting ring belt 43 which is first inserted.

[0037] The bottoms of the first drip irrigation submain 31 and the second drip irrigation submain 32 are arranged with drip irrigation openings 33, and one drip irrigation opening 33 is arranged below each of the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24.

[0038] The outer part of each drip irrigation port 33 is provided with a support cover 5, which is fixed to the bottom of the first and second drip irrigation sub-pipes 31 and 32. The support cover 5 has a vertical inverted conical structure, and is hollow and penetrates through the upper and lower parts. The bottom end of the support cover 5 abuts against the surface of the culture soil 11. The support cover 5 is made of weather-resistant ABS material, has a height of 30-50 mm, and a bottom contact surface with a diameter of 10-20 mm.

[0039] Specifically, the support cover 5 has the following functions. First, the connecting rod assembly 2 and the first and second drip irrigation sub-pipes 31 and 32 are supported on the surface of the culture soil 11 to facilitate drip irrigation of the seedlings 12. Second, the support cover 5 can prevent the small drip irrigation ports 33 from being blocked by the soil due to direct contact between the drip irrigation ports 33 and the culture soil 11. The bottom end of the support cover 5 is provided with a protective net 51, which can further protect the drip irrigation ports 33 from being blocked by the soil. The protective net 51 is made of a 200-mesh stainless steel filter screen, which can block particles with a particle size greater than 0.075 mm. Third, the water droplets flowing out of the drip irrigation ports 33 penetrate into the culture soil 11 after flowing through the support cover 5. The support cover 5 prevents the water droplets from being directly exposed to the external air, greatly reduces the evaporation of water, and improves the irrigation efficiency.

[0040] The pot along position of the culture pot 1 is provided with a positioning assembly 6, which is provided with two groups and is rotationally symmetrical. The positioning assembly 6 includes an L-shaped clamping plate 61, a moving clamping plate 62, and an adjusting rod 63. The L-shaped clamping plate 61 and the moving clamping plate 62 are matched and form an inverted U-shaped structure. The L-shaped clamping plate 61 and the moving clamping plate 62 are used to clamp the pot along position. The top of the L-shaped clamping plate 61 is provided with a mounting groove 64, in which a screw rod 65 is horizontally arranged. The top of the moving clamping plate 62 penetrates into the mounting groove 64 and is threadedly connected with the screw rod 65. The moving clamping plate 62 and the L-shaped clamping plate 61 are slidingly connected. The end of the screw rod 65 penetrates out of the L-shaped clamping plate 61 and is connected with a first knob 66. The top of the L-shaped clamping plate 61 is fixedly connected with a connecting column 67. The connecting column 67 is rotationally connected with one end of the adjusting rod 63. The other end of the adjusting rod 63 is rotationally connected with the first short connecting shaft 25. The top outer wall of the connecting column 67 is provided with an external thread. The connecting column 67 is rotationally connected with a second knob 68 provided with an internal thread.

[0041] Specifically, the inner diameter of the irrigation ring area 7 is adjusted by simultaneously adjusting the two adjusting rods 63. When the adjusting rods 63 are pushed outward, the two first short connecting shafts 25 are moved in opposite directions, respectively. Due to the linkage of the connecting rods, the first connecting rods 21, the second connecting rods 22, the third connecting rods 23, and the fourth connecting rods 24 are simultaneously stretched outward, thereby causing the first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32 to stretch outward, causing the irrigation ring area 7 to expand outward, and causing the drip irrigation openings 33 to cooperate with the support cover 5 to irrigate the external root system. In the opposite direction, the same principle applies. The adjusting rods 63 can achieve stepless adjustment of the diameter of the irrigation ring area 7 within a range of 10-50 cm. When adjusted to the appropriate position, the adjusting rods 63 are tightened against the L-shaped clamping plate 61 by tightening the second knob 68, thereby limiting the expansion of the first connecting rods 21, the second connecting rods 22, the third connecting rods 23, and the fourth connecting rods 24, and causing the irrigation ring area 7 to remain in the current position.

[0042] The water inlets and outlets of the first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32 are provided with clamping joints 81, which are connected to the total drip irrigation pipe 8. The clamping joints 81 are quick-connection silicone sealed joints with built-in double O-ring seals, and the outer diameter tolerance is controlled within ±0.1 mm, which can withstand water pressure of 0.3-2 MPa without leakage. The total drip irrigation pipe 8 is a segmented water pipe. One end of each total drip irrigation pipe 8 is connected to the water outlets of the first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32, and the other end is connected to the water inlets of the first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32 arranged in the adjacent culture pots 1, achieving series irrigation of each culture pot 1. Under the premise of ensuring uniform water supply to the root system of the seedlings 12, the number of pots connected in series by a single irrigation line should not exceed 5 pots.

[0043] The most end total drip irrigation pipe 8 is connected to the booster water pump and the water tank 9. The water tank 9 is equipped with a pressure sensor and a PID controller for convenient control of irrigation water volume, irrigation time, and irrigation pressure.

[0044] The seedlings 12 can be sold after a certain period of cultivation. At this time, the first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32 are disconnected from the total drip irrigation pipe 8. The first drip irrigation sub-pipes 31 and the second drip irrigation sub-pipes 32 and the connecting rod assembly 2 can be retained in the culture pots 1 and sold to customers. In subsequent daily maintenance, one end of the clamping joint 81 can be plugged, and the other end of the clamping joint 81 is connected to the drip irrigation container, thereby continuing to supply water to the root system.

[0045] The above scheme is described in combination with specific embodiments: for the maintenance of seedlings 12 of 10-35 days after sowing of low Phalaenopsis, suitable for seedlings with stem diameter of 1.5-5.0 mm. The device is deployed in a seedling greenhouse with stable environmental temperature of 22±2℃, light intensity of 5000-8000 Lux, and air humidity of 60%-70%.

[0046] 10 days after sowing, cotyledon expansion stage:

[0047] The initial diameter of the irrigation ring 7 was 10 cm, and it was fixed by applying a torque of 0.8 N·m through the adjusting rod 63. Micro-irrigation was carried out 3 times a day at 8:00 / 12:00 / 16:00 for 5 minutes each time, and the daily water supply to a single plant was strictly controlled at 25±3 ml, forcing the roots to explore the edge of the ring area.

[0048] 15 days after sowing, first true leaf growth stage:

[0049] The irrigation ring 7 was expanded by 3 cm in diameter every week, and the adjusting rod 63 was gradually released by rotating the second knob 68, so that the angle of the diamond-shaped connecting rod was expanded from the initial 50° to 70°, and the irrigation amount was increased to 35 ml / day. At this time, the length of the secondary lateral roots reached 8-10 cm, which was 40% higher than that of traditional peripheral irrigation.

[0050] 25 days after sowing, seedling preparation stage:

[0051] The irrigation ring 7 was expanded to a final diameter of 22 cm, and the single irrigation time was extended to 8 minutes. At this time, the tip of the main root had extended to 2-3 cm outside the irrigation ring 7, forming an umbrella-shaped root system with a diameter of 25 cm, and the root crown ratio increased from 0.6 to 0.9.

[0052] Compared with traditional drip irrigation technology, the seedlings using the device had an increase of 55% in effective root absorption surface area measured by methylene blue staining method, a decrease of 70% in salt accumulation on the surface of the substrate measured by conductivity, and a recovery period after transplanting shortened from 48 hours to 12 hours, and no wilting phenomenon of seedling leaves during the recovery period.

[0053] Working principle: the seedlings 12 are planted in the center of the culture soil 11 in the culture pot 1, and the device is fixed on the pot rim through the positioning assembly 6. The L-shaped clamping plate 61 and the movable clamping plate 62 of the positioning assembly 6 clamp the pot rim, the first knob 66 is twisted to drive the screw rod 65 to adjust the clamping tightness, and the stability of the device is ensured. The two sets of adjusting rods 63 are adjusted to drive the first short connecting shaft 25 to move in the opposite direction. Due to the linkage of the rhombic linkage assembly 2, the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24 are hingedly connected at the head and tail, all the connecting rods are stretched outward, and the drip irrigation branch pipe 3 and the irrigation ring area 7 are synchronously expanded. After the adjustment is completed, the second knob 68 is tightened to lock the connecting column 67, and the current irrigation ring area diameter is maintained. The total drip irrigation pipe 8 is connected with the drip irrigation branch pipe through the clamping joint 81, and a series water supply system is formed. Each drip irrigation port 33 is located directly below the connecting rod, which ensures that the water is accurately infiltrated into the root system growth end. The drip irrigation port 33 is externally provided with a reverse conical support cover 5, the bottom end of which abuts against the surface of the culture soil 11, preventing the drip irrigation port from directly contacting the soil and causing blockage. After the seedlings mature, the clamping joint 81 is disconnected from the total drip irrigation pipe 8, and the drip irrigation branch pipe 31, 32 and the connecting rod assembly 2 are retained in the culture pot 1. The user can block one end of the clamping joint 81, and the other end is connected with an independent drip irrigation container to continue water supply and maintenance.

[0054] It should be noted that the relative terms such as first and second, etc. are used herein merely to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such process, method, article or apparatus.

[0055] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application.

Claims

1. A drip irrigation device for seedlings with different diameters, comprising a culture pot (1), characterized in that, The cultivation pot (1) is filled with cultivation soil (11). Above the cultivation soil (11) is a ring-shaped connecting rod structure formed by hinged ends of several connecting rod components (2). The ring-shaped connecting rod structure surrounds the main stem of the seedling (12). The bottom of the connecting rod component (2) is provided with a drip irrigation branch pipe (3) through a limiting ring (4). The drip irrigation branch pipe (3) includes a first drip irrigation branch pipe (31) and a second drip irrigation branch pipe (32). The first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) are alternately inserted into the limiting ring (4) of the adjacent connecting rod component (2) along the ring-shaped connecting rod structure to form a watering ring area (7) that can expand synchronously with the expansion and contraction of the ring-shaped connecting rod structure. The bottom of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) are provided with drip irrigation ports (33). The diameter of the drip irrigation ports (33) is 0.5-0.8mm. A support cover (5) is provided outside the drip irrigation ports (33). The support cover (5) is a vertical inverted cone structure. The inside of the support cover (5) is a hollow structure and is open from top to bottom. The first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) are supported on the surface of the culture soil (11) through the support cover (5). The linkage assembly (2) consists of a first linkage (21), a second linkage (22), a third linkage (23), and a fourth linkage (24) forming a rhomboid four-bar structure. The first linkage (21) and the second linkage (22) are hinged together by a first short connecting shaft (25), the third linkage (23) and the fourth linkage (24) are hinged together by a second short connecting shaft (26), and the first linkage (21) and the fourth linkage (24) are hinged together by a long connecting shaft (27). The second linkage (22) and the third linkage (23) of adjacent linkage assemblies are connected by a long connecting shaft (27). Each of the first linkage (21), the second linkage (22), the third linkage (23), and the fourth linkage (24) has a drip irrigation port (33) distributed below it. The limiting ring band (4) includes a first limiting ring band (41), a second limiting ring band (42) and a third limiting ring band (43). The first limiting ring band (41) is fixed to the bottom end of the first short connecting shaft (25), the second limiting ring band (42) is fixed to the bottom end of the second short connecting shaft (26), and the third limiting ring band (43) is fixed to the bottom end of the long connecting shaft (27). The first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) cross through the third limiting ring (43) of the adjacent connecting rod assembly, and alternately pass through the first limiting ring (41) and the second limiting ring (42). The culture basin (1) has two sets of positioning components (6) along its rim, which are distributed symmetrically. Each set of positioning components (6) includes an L-shaped clamping plate (61), a movable clamping plate (62), and an adjusting rod (63). The L-shaped clamping plate (61) and the movable clamping plate (62) cooperate to form an inverted U-shaped structure. The rim of the basin is clamped by the L-shaped clamping plate (61) and the movable clamping plate (62). The top of the L-shaped clamping plate (61) is provided with an installation groove (64). A screw (65) is horizontally arranged in the installation groove (64). The top of the movable clamping plate (62) passes through the installation groove (64) and is threadedly engaged with the screw (65). The movable clamping plate (62) and the L-shaped clamping plate (61) are slidably connected. The end of the screw (65) passes through the L-shaped clamping plate (61) and is connected to the first knob (66).

2. The seedling drip irrigation device applicable to different diameters as described in claim 1, characterized in that, The bottom end of the support cover (5) is in contact with the surface of the culture soil (11), and a protective net (51) is provided at the bottom opening. The protective net (51) is made of 150-200 mesh stainless steel filter screen, and the height of the support cover (5) is 40-50mm.

3. A seedling drip irrigation device suitable for different diameters as described in claim 2, characterized in that, The top of the L-shaped plate (61) is fixed with a connecting post (67). The connecting post (67) is rotatably connected to one end of the adjusting rod (63), and the other end of the adjusting rod (63) is rotatably connected to the first short connecting shaft (25). The top outer wall of the connecting post (67) is provided with an external thread, and the connecting post (67) is rotatably connected to the second knob (68) which is provided with an internal thread.

4. A seedling drip irrigation device suitable for different diameters as described in claim 3, characterized in that, The inlet and outlet of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) are both equipped with clamp connectors (81). The first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) are connected to the main drip irrigation pipe (8) through the clamp connectors (81). The clamp connectors (81) are embedded with double O-ring rubber sealing rings, and the outer diameter tolerance is controlled within ±0.1mm.

5. A seedling drip irrigation device suitable for different diameters according to claim 4, characterized in that, The main drip irrigation pipe (8) is a segmented water pipe. One end of each main drip irrigation pipe (8) is connected to the outlet of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32), and the other end is connected to the inlet of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) set in the adjacent culture pot (1).

6. A seedling drip irrigation device suitable for different diameters according to claim 5, characterized in that, One end of the main drip irrigation pipe (8) is connected to the booster pump and the water tank (9), and is equipped with a pressure sensor and a PID controller.

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