Surrounding type seedling drip irrigation device suitable for different calibers

Abstract

The invention discloses a surrounding type seedling drip irrigation device suitable for different calibers, and belongs to the technical field of drip irrigation. The surrounding type seedling drip irrigation device suitable for different calibers comprises a culture pot, the culture pot is filled with culture soil, an annular connecting rod structure formed by hinging a plurality of connecting rod assemblies end to end is arranged above the culture soil, and the annular connecting rod structure surrounds a seedling stem; drip irrigation branch pipes penetrate through the bottoms of the connecting rod assemblies through limiting ring belts and comprise the first drip irrigation branch pipes and the second drip irrigation branch pipes, and the first drip irrigation branch pipes and the second drip irrigation branch pipes alternately penetrate through the limiting ring belts of the adjacent connecting rod assemblies along the annular connecting rod structures to form irrigation ring areas capable of synchronously expanding along with stretching and retracting of the annular connecting rod structures. The problems that in an existing drip irrigation technology, an irrigation area is static, the water utilization rate is low, and root system regulation and control are lacked are solved. The irrigation range can be dynamically adjusted, and root growth can be accurately matched.

Description

Technical Field

[0001] The present invention relates to the technical field of drip irrigation, and specifically to a circumferential seedling drip irrigation device applicable to different diameters. Background Art

[0002] Current drip irrigation technology has been widely used in the field of agricultural seedling cultivation, but the following key problems still need to be solved urgently in the seedling cultivation scenario:

[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. Experiments show that the daily average outward expansion speed of tomato seedling roots during the growth period reaches 0.8 - 1.2 cm, and the fixed radius of the traditional drip irrigation ring causes 30% of the irrigation water volume to act on the ineffective area, resulting in waste of water resources; it is difficult for the same drip irrigation ring to adapt to the seedling stem diameters of different calibers. When the stem diameter > the inner diameter of the drip irrigation ring, the young stem is easily damaged during the installation process; when the stem diameter < 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, the water evaporation loss rate is as high as 22% - 28%. And the existing technology uses uniformly distributed drip heads, but does not consider the hydrotropic characteristics of the seedling root growth. When the roots grow concentrated on one side, this area is prone to root rot due to excessive water (the incidence rate increases by 15% - 20%), while the growth on the other side is inhibited due to insufficient water supply. Summary of the Invention

[0004] The purpose of the present invention is to provide a circumferential seedling drip irrigation device applicable to different diameters, which can dynamically adjust the irrigation range and accurately match the root growth, and solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A circumferential seedling drip irrigation device applicable to different diameters includes a cultivation pot. The cultivation pot is filled with cultivation soil. Above the cultivation soil, there is a circular link structure formed by end-to-end hinging of several link components, and the circular link structure surrounds the main stem of the seedling; a drip irrigation sub-pipe is penetrated through the bottom of the link component by a limit ring belt. The drip irrigation sub-pipe includes 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 limit ring belts of adjacent link components along the circular link structure to form an irrigation ring area that can expand synchronously with the expansion and contraction of the circular link structure;

[0007] Drip irrigation ports are arranged in a row at the bottom of both the first drip irrigation sub-pipe and the second drip irrigation sub-pipe. The diameter of the drip irrigation port is 0.5 - 0.8 mm. A support cover is arranged outside the drip irrigation port. The support cover is in the shape of a vertical inverted cone. The inside of the support cover is a hollow structure and is through up and down. The first drip irrigation sub-pipe and the second drip irrigation sub-pipe are supported on the surface of the cultivation 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 rhombic four-connecting rod structure. 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 adjacent connecting rod assemblies are connected by a long connecting shaft;

[0009] Below each of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod, a drip irrigation port is distributed.

[0010] Preferably, the limiting ring band includes a first limiting ring band, a second limiting ring band and a third limiting ring band. The first limiting ring band is fixed to the bottom end of the first short connecting shaft, the second limiting ring band is fixed to the bottom end of the second short connecting shaft, and the third limiting ring band 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 band of adjacent connecting rod assemblies and alternately pass through the first limiting ring band and the second limiting ring band.

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

[0013] Preferably, two groups of positioning components are provided on the basin edge of the culture basin and are rotationally symmetrically distributed. Each positioning component includes an L-shaped clamping plate, a movable clamping plate and an adjusting rod. The L-shaped clamping plate and the movable clamping plate cooperate to form an inverted U-shaped structure, and the basin edge is clamped by the L-shaped clamping plate and the movable clamping plate. An installation groove is provided at the top of the L-shaped clamping plate, a screw rod is horizontally arranged in the installation groove, the top of the movable clamping plate penetrates into the installation groove and is in threaded cooperation with the screw rod, the movable clamping plate and the L-shaped clamping plate are slidably connected, and the end of the screw rod penetrates out of the L-shaped clamping plate and is connected to a first knob.

[0014] Preferably, a connecting column is fixed to the top of the L-shaped clamping plate. The connecting column is rotatably connected to one end of the adjusting rod, and the other end of the adjusting rod is rotatably connected to the first short connecting shaft. External threads are provided on the outer wall of the top of the connecting column, and the connecting column is rotatably connected to a second knob with internal threads.

[0015] Preferably, clamping joints are provided at the water inlets and outlets of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe. The first drip irrigation sub-pipe and the second drip irrigation sub-pipe are connected to the main drip irrigation pipe through the clamping joints. Double O-ring rubber seals are embedded in the clamping joints, and the outer diameter tolerance is controlled within the range of ±0.1 mm.

[0016] Preferably, the main drip irrigation pipe is a segmented water pipe. One end of each main drip irrigation pipe is connected to the water outlets of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe, and the other end is connected to the water inlets of the first drip irrigation sub-pipe and the second drip irrigation sub-pipe arranged in adjacent culture basins.

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

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The present invention can adjust the diameter of the irrigation ring area according to the change of the seedling root growth area, so that the irrigation water can accurately penetrate to the end of the root growth. Through the periodic expansion of the irrigation ring area, the seedling roots are forced to extend outwards, increasing the volume of the effective absorption area by 35 - 55%, and the root-shoot ratio is increased by more than 50%. The ring-shaped drip irrigation can avoid the problem that the traditional drip irrigation technology is prone to cause unidirectional root development, and significantly enhance the water capture ability and lodging resistance of the plants.

[0020] 2. The present invention adopts a drip irrigation strategy that dynamically matches the root position, reduces the ineffective irrigation area, saves 28 - 35% of water compared with the traditional ring irrigation, and at the same time increases the fertilizer utilization rate from 61% to 83%, reducing the risk of salinization.

[0021] 3. By setting the support cover, the present invention can support the connecting rod assembly, the first drip irrigation branch pipe and the second drip irrigation branch pipe on the surface of the cultivation soil for drip irrigation operation of the seedlings, avoiding the direct contact between the drip irrigation port and the cultivation soil, which may cause the small drip irrigation port to be blocked by soil. The water droplets flowing out of the drip irrigation port penetrate into the cultivation soil after flowing through the support cover. The support cover avoids the direct exposure of the water droplets to the external air, greatly reducing the evaporation of water and improving the irrigation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Is an axonometric view of the overall structure of the present invention;

[0023] Figure 2 Is an axonometric view of the internal structure of the cultivation pot of the present invention;

[0024] Figure 3 Is a schematic diagram of the contracted state of the connecting rod assembly of the present invention;

[0025] Figure 4 Is a schematic diagram of the expanded state of the connecting rod assembly driving the drip irrigation branch pipe of the present invention;

[0026] Figure 5 Is a schematic diagram of a part of the connecting rod assembly of the present invention;

[0027] Figure 6 Is a longitudinal sectional view of the support cover of the present invention;

[0028] Figure 7 Is a sectional view of the positioning assembly of the present invention.

[0029] In the figure: 1. Cultivation pot; 11. Cultivation soil; 12. Seedling; 2. Link assembly; 21. First link; 22. Second link; 23. Third link; 24. Fourth link; 25. First short connecting shaft; 26. Second short connecting shaft; 27. Long connecting shaft; 3. Sub-drip irrigation pipe; 31. First sub-drip irrigation pipe; 32. Second sub-drip irrigation 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. Protection net; 6. Positioning assembly; 61. L-shaped clamping plate; 62. Movable clamping plate; 63. Adjusting rod; 64. Installation groove; 65. Screw; 66. First knob; 67. Connecting column; 68. Second knob; 7. Irrigation ring area; 8. Main drip irrigation pipe; 81. Clamping joint; 9. Water tank. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In order to solve the problems of static irrigation area, low water utilization rate, lack of root system regulation in the existing drip irrigation technology, resulting in waste of water resources and extension of the seedling raising cycle, please refer to Figure 1-7 , the following technical solutions are provided in this embodiment:

[0032] A circumferential seedling drip irrigation device applicable to different diameters includes a cultivation pot 1. Cultivation soil 11 is filled in the cultivation pot 1. A seedling 12 is planted at the center of the cultivation soil 11. Above the cultivation soil 11, there is a link assembly 2. A number of link assemblies 2 are provided and connected end to end to form an annular link structure, surrounding and enclosing the main stem of the seedling 12. Below the link assembly 2, there is a sub-drip irrigation pipe 3. The sub-drip irrigation pipe 3 is connected to the link assembly 2 through a limiting ring belt 4. The area surrounded by the sub-drip irrigation pipe 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 seedling, so that the irrigation water can accurately penetrate to the end of the root growth.

[0033] The connecting rod assembly 2 includes a first connecting rod 21, a second connecting rod 22, a third connecting rod 23, and a fourth connecting rod 24. The first connecting rod 21, the second connecting rod 22, the third connecting rod 23, and the fourth connecting rod 24 have the same length. The first connecting rod 21, the second connecting rod 22, the third connecting rod 23, and the fourth connecting rod 24 are sequentially hinged end to end to form a rhombic 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 to the adjacent first connecting rod 21 and fourth connecting rod 24 through the long connecting shaft 27.

[0034] The limiting ring belt 4 includes 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 branch pipes include 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 both distributed in a surrounding manner 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 branch pipe 31 and the second drip irrigation branch pipe 32 first penetrate into the third limiting ring belt 43 in opposite directions, then cross and disperse. The first drip irrigation branch pipe 31 penetrates through the first limiting ring belt 41, the second drip irrigation branch pipe 32 penetrates through the second limiting ring belt 42. Then, after the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 converge, they penetrate through the third limiting ring belt 43 of the adjacent connecting rod assembly 2 in opposite directions, then cross and disperse again. The first drip irrigation branch pipe 31 penetrates through the second limiting ring belt 42 of the adjacent connecting rod assembly 2, the second drip irrigation branch pipe 32 penetrates through the first limiting ring belt 41. Then, they converge again and penetrate through the third limiting ring belt 43 of the next connecting rod assembly 2 in opposite directions, repeating the above process until the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 are arranged in a surrounding manner and exit from the third limiting ring belt 43 where they initially penetrated.

[0037] Drip irrigation openings 33 are arranged in a row at the bottoms of the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32. One drip irrigation opening 33 is distributed 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] A support cover 5 is provided outside each drip irrigation port 33. The support cover 5 is fixed to the bottoms of the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32. The support cover 5 is in a vertical inverted cone structure. The inside of the support cover 5 is a hollow structure and is through up and down. The bottom end of the support cover 5 abuts against the surface of the cultivation soil 11. The support cover 5 is made of weather-resistant ABS material, with a height of 30 - 50 mm and a bottom contact surface diameter of 10 - 20 mm.

[0039] Specifically, the functions of setting the support cover 5 are as follows: First, it can support the link assembly 2, the first drip irrigation branch pipe 31, and the second drip irrigation branch pipe 32 on the surface of the cultivation soil 11 to facilitate the drip irrigation operation for the seedlings 12. Second, it can prevent the small drip irrigation port 33 from being blocked by soil due to direct contact between the drip irrigation port 33 and the cultivation soil 11. A protective net 51 is provided at the bottom end of the support cover 5, which can further protect the drip irrigation port 33 and prevent more sediment from entering the support cover 5 and adhering to the drip irrigation port 33 to cause blockage. 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 port 33 seep into the cultivation 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 reducing water evaporation and improving irrigation efficiency.

[0040] A positioning assembly 6 is provided at the basin edge position of the cultivation basin 1. There are two groups of the positioning assemblies 6 and they are rotationally symmetrically distributed. The positioning assembly 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, and the basin edge is clamped by the L-shaped clamping plate 61 and the movable clamping plate 62. An installation groove 64 is provided at the top of the L-shaped clamping plate 61. A screw rod 65 is horizontally arranged in the installation groove 64. The top of the movable clamping plate 62 penetrates into the installation groove 64 and is in threaded cooperation with the screw rod 65. The movable clamping plate 62 and the L-shaped clamping plate 61 are slidably connected. The end of the screw rod 65 penetrates out of the L-shaped clamping plate 61 and is connected to a first knob 66. A connecting column 67 is fixed to the top of the L-shaped clamping plate 61. One end of the connecting column 67 is rotatably connected to one end of the adjusting rod 63. The other end of the adjusting rod 63 is rotatably connected to the first short connecting shaft 25. An external thread is provided on the outer wall of the top of the connecting column 67, and the connecting column 67 is rotatably connected to a second knob 68 with an internal thread.

[0041] Specifically, the inner diameter of the irrigation ring area 7 is adjusted by simultaneously toggling two adjusting rods 63. When the adjusting rods 63 are toggled outward from the seedling 12, the adjusting rods 63 drive two first short connecting shafts 25 to move outward in the opposite direction respectively. Due to the linkage effect of the connecting rods, several groups of first connecting rods 21, second connecting rods 22, third connecting rods 23 and fourth connecting rods 24 are simultaneously stretched outward, thereby driving the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 to stretch outward, expanding the irrigation ring area 7 outward. The drip irrigation openings 33 cooperate with the support cover 5 to irrigate the external root system. Similarly, in the reverse direction, the diameter of the irrigation ring area 7 can be steplessly adjusted within the range of 10 - 50 cm through the adjusting rods 63. 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 restricting the expansion and contraction of several groups of first connecting rods 21, second connecting rods 22, third connecting rods 23 and fourth connecting rods 24, and keeping the irrigation ring area 7 in the current position.

[0042] The water inlets and outlets of the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 are both provided with clamping joints 81, and are connected to the main drip irrigation pipe 8 through the clamping joints 81; the clamping joints 81 adopt quick-connect silicone sealing joints, with a double-layer O-ring seal inside, and the outer diameter tolerance is controlled within the range of ±0.1 mm, and it can withstand a water pressure of 0.3 - 2 MPa without leakage; the main drip irrigation pipe 8 is a segmented water pipe, one end of each main drip irrigation pipe 8 is connected to the water outlets of the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32, and the other end is connected to the water inlets of the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 arranged in the adjacent cultivation pots 1, realizing the series irrigation of each cultivation pot 1; on the premise of ensuring uniform water supply to the root systems of the seedlings 12, the number of pots connected in series by a single irrigation line should not exceed 5 pots.

[0043] The main drip irrigation pipe 8 at the outermost end is connected to a booster pump and a water tank 9. The water tank 9 is equipped with a pressure sensor and a PID controller, which is convenient for regulating the irrigation water volume, irrigation time, irrigation pressure, etc.

[0044] After the seedlings 12 are cultivated to a certain stage, they can be sold. At this time, the first drip irrigation branch pipe 31 and the second drip irrigation branch pipe 32 are disconnected from the main drip irrigation pipe 8. The first drip irrigation branch pipe 31, the second drip irrigation branch pipe 32 and the connecting rod assembly 2 can be retained in the cultivation pot 1 and sold to customers. During subsequent daily maintenance, one end of the clamping joint 81 can be blocked, and the other end of the clamping joint 81 is connected to a drip irrigation container, so as to continue to supply water to the root system.

[0045] The above scheme is described in combination with specific embodiments: For the maintenance of the seedling stage of dwarf Phalaenopsis for 10 - 35 days after sowing, it is applicable to young plants with a stem diameter of 1.5 - 5.0 mm. The device is deployed in a seedling-raising greenhouse, with the environmental temperature stable at 22 ± 2 °C, the light intensity of 5000 - 8000 Lux, and the air humidity maintained at 60% - 70%.

[0046] On the 10th day after sowing, cotyledon expansion stage:

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

[0048] On the 15th day after sowing, the first true leaf growth stage:

[0049] The diameter of the irrigation ring area 7 is expanded by 3 cm per week. By gradually releasing the adjusting rod 63 by rotating the second knob 68, the included angle of the rhombic connecting rod is expanded from the initial 50° to 70°, and the drip irrigation amount is increased to 35 ml / day. At this time, it can be seen that the growth length of the secondary lateral roots reaches 8 - 10 cm, which is 40% more than that of traditional peripheral irrigation.

[0050] On the 25th day after sowing, the seedling hardening preparation stage:

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

[0052] Compared with the traditional drip irrigation technology, when transplanting the seedlings using this device, the effective absorption surface area of the roots measured by the methylene blue staining method is increased by 55%, the salt accumulation on the surface of the substrate measured by the conductivity is reduced by 70%, the recovery period after transplanting is shortened from 48 hours of the traditional method to 12 hours, and there is no wilting phenomenon of the leaves during the seedling slowdown period.

[0053] Working principle: Plant the seedling 12 at the center of the cultivation soil 11 in the cultivation pot 1, and fix the device on the pot edge through the positioning component 6. The L-shaped clamping plate 61 and the moving clamping plate 62 of the positioning component 6 clamp the pot edge, and turn the first knob 66 to drive the screw rod 65 to adjust the clamping tightness to ensure the stability of the device. Toggle the two groups of adjusting rods 63 to drive the first short connecting shaft 25 to move in the opposite direction. Due to the linkage of the rhombic connecting rod assembly 2, the first connecting rod 21, the second connecting rod 22, the third connecting rod 23, and the fourth connecting rod 24 are hinged end to end, and all the connecting rods are stretched outwards, so that the drip irrigation sub-pipes 3 and the watering ring area 7 are expanded synchronously. After the adjustment is completed, tighten the second knob 68 to lock the connecting column 67 and maintain the current diameter of the watering ring area. The main drip irrigation pipe 8 is connected to the drip irrigation sub-pipe through the card connector 81 to form a series water supply system. Each drip irrigation port 33 is located directly below the connecting rod to ensure that water accurately penetrates into the root growth end. A conical support cover 5 is arranged outside the drip irrigation port 33, and its bottom end abuts against the surface of the cultivation soil 11 to prevent the drip irrigation port from directly contacting the soil and causing blockage. After the seedling matures, disconnect the connection between the card connector 81 and the main drip irrigation pipe 8, and retain the drip irrigation sub-pipes 31, 32 and the connecting rod assembly 2 in the cultivation pot 1. The user can block one end of the card connector 81 and connect an independent drip irrigation container to the other end to continue water supply and maintenance.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. A circumferential seedling drip irrigation device applicable to different calibers, comprising a cultivation pot (1), characterized in that, The cultivation pot (1) is filled with cultivation soil (11). Above the cultivation soil (11), there is an annular connecting rod structure formed by end-to-end hinging of several connecting rod assemblies (2), and the annular connecting rod structure surrounds the main stem of the seedling (12); a drip irrigation sub-pipe (3) is passed through the bottom of the connecting rod assembly (2) by a limit ring belt (4). The drip irrigation sub-pipe (3) includes a first drip irrigation sub-pipe (31) and a second drip irrigation sub-pipe (32). The first drip irrigation sub-pipe (31) and the second drip irrigation sub-pipe (32) are alternately inserted into the limit ring belts (4) of adjacent connecting rod assemblies (2) along the annular connecting rod structure to form an irrigation ring area (7) that can expand synchronously with the expansion and contraction of the annular connecting rod structure. Drip irrigation openings (33) are arranged in a staggered manner at the bottoms of both the first drip irrigation sub-pipe (31) and the second drip irrigation sub-pipe (32). The diameter of the drip irrigation opening (33) is 0.5 - 0.8 mm. A support cover (5) is arranged outside the drip irrigation opening (33). The support cover (5) is in a vertical inverted cone structure. The inside of the support cover (5) is a hollow structure and is through up and down. The first drip irrigation sub-pipe (31) and the second drip irrigation sub-pipe (32) are supported on the surface of the cultivation soil (11) through the support cover (5).

2. The applicable different-caliber circumferential seedling drip irrigation device according to claim 1, wherein The connecting rod assembly (2) is composed of a first connecting rod (21), a second connecting rod (22), a third connecting rod (23), and a fourth connecting rod (24) to form a rhombic four-connecting rod structure. Among them, the first connecting rod (21) and the second connecting rod (22) are hinged by a first short connecting shaft (25), the third connecting rod (23) and the fourth connecting rod (24) are hinged by a second short connecting shaft (26), the first connecting rod (21) and the fourth connecting rod (24) are hinged by a long connecting shaft (27), and the second connecting rod (22) and the third connecting rod (23) of adjacent connecting rod assemblies are connected by a long connecting shaft (27); One drip irrigation opening (33) is distributed below each of the first connecting rod (21), the second connecting rod (22), the third connecting rod (23), and the fourth connecting rod (24).

3. The circumferential seedling drip irrigation device applicable to different calibers according to claim 2, characterized in that, The limit ring belt (4) includes a first limit ring belt (41), a second limit ring belt (42), and a third limit ring belt (43). The first limit ring belt (41) is fixed to the bottom end of the first short connecting shaft (25), the second limit ring belt (42) is fixed to the bottom end of the second short connecting shaft (26), and the third limit ring belt (43) is fixed to the bottom end of the long connecting shaft (27); The first drip irrigation sub-pipe (31) and the second drip irrigation sub-pipe (32) cross through the third limit ring belt (43) of adjacent connecting rod assemblies and are alternately inserted into the first limit ring belt (41) and the second limit ring belt (42).

4. The circumferential seedling drip irrigation device applicable to different calibers according to claim 3, characterized in that, The bottom end of the support cover (5) is in contact with the surface of the cultivation soil (11). A protective net (51) is arranged at the bottom opening thereof. The protective net (51) is made of a 150 - 200 mesh stainless steel filter screen, and the height of the support cover (5) is 40 - 50 mm.

5. A circumferential seedling drip irrigation device applicable to different calibers according to claim 4, characterized in that, The edge of the cultivation pot (1) is provided with two groups of positioning components (6) which are rotationally symmetrically distributed. Each positioning component (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, and the edge of the pot is clamped by the L-shaped clamping plate (61) and the movable clamping plate (62). An installation groove (64) is provided at the top of the L-shaped clamping plate (61), a screw rod (65) is horizontally arranged in the installation groove (64), the top of the movable clamping plate (62) penetrates into the installation groove (64) and is in threaded cooperation with the screw rod (65). The movable clamping plate (62) is slidably connected to the L-shaped clamping plate (61), and the end of the screw rod (65) penetrates out of the L-shaped clamping plate (61) and is connected to the first knob (66).

6. The circumferential seedling drip irrigation device applicable to different calibers according to claim 5, characterized in that, A connecting column (67) is fixed at the top of the L-shaped clamping plate (61). The connecting column (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). External threads are provided on the outer wall of the top of the connecting column (67), and the connecting column (67) is rotatably connected to a second knob (68) provided with internal threads.

7. A circumferential seedling drip irrigation device applicable to different calibers according to claim 6, characterized in that, Clamping joints (81) are provided at both the water inlet and the water outlet of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32). 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 clamping joints (81). Double O-ring rubber seals are embedded in the clamping joints (81), and the outer diameter tolerance is controlled within the range of ±0.1 mm.

8. A circumferential seedling drip irrigation device applicable to different calibers according to claim 7, 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 water outlets of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32), and the other end is connected to the water inlets of the first drip irrigation branch pipe (31) and the second drip irrigation branch pipe (32) arranged in the adjacent cultivation pots (1).

9. The one kind of circumferential seedling drip irrigation device applicable to different calibers according to claim 8, characterized in that, One end of the main drip irrigation pipe (8) is connected to a booster pump and a water tank (9), and a pressure sensor and a PID controller are installed in a supporting manner.

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