Soilless culture device for lettuce

Abstract

The invention belongs to the technical field of lettuce cultivation, and particularly relates to a lettuce soilless cultivation device which comprises a plurality of round pipes, a plurality of round holes are formed in the upper ends of the round pipes, L-shaped round pipes are fixedly connected to the two sides of each round pipe respectively, breeding assemblies are arranged in the middles of the round holes, and each breeding assembly comprises an arc-shaped filter screen arranged in the middle of the corresponding round hole. A first circular ring is connected to the middle of the upper end of the arc-shaped filter screen through a sliding assembly, the sliding assembly is used for driving the first circular ring to longitudinally slide in the arc-shaped filter screen, a circular sponge is installed in the middle of the first circular ring, a circular groove is formed in the middle of the upper end of the circular sponge, and the circular groove is used for storing seeds; lettuce seeds are placed on the circular sponge to root, then the first circular ring is driven to drive the rooted lettuce seedlings to slide downwards, the roots of the lettuce seedlings make contact with water in the circular pipe, and the problem that the lettuce roots are possibly damaged in the lettuce transferring process, and therefore the survival rate of lettuces is reduced is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lettuce cultivation, and specifically relates to a soilless cultivation device for lettuce. Background Art

[0002] Soilless cultivation refers to a cultivation method in which water, peat, forest leaf mold, vermiculite and other media are used as the matrix for the plant roots to fix the plants, and the plant roots can directly contact the nutrient solution. In soilless cultivation, the composition of the nutrient solution is easy to control and can be adjusted at any time. In places where light and temperature are suitable and there is no soil, such as deserts, beaches, and deserted islands, as long as there is a certain amount of fresh water supply, it can be carried out. Soilless cultivation is divided into hydroponics, fog (aeroponics) cultivation and substrate cultivation according to different cultivation media. Hydroponics refers to a cultivation method in which plant roots directly contact the nutrient solution without using a substrate.

[0003] A patent application with the publication number CN220987025U discloses a soilless cultivation device for lettuce. Through the combined use of longitudinal pull rods, U-shaped positioning frames, positioning rods, positioning grooves, springs and fixing grooves, the detachable nature of the planting plate facilitates the later picking of mature lettuce. For the detachable structure of the planting plate, the operation is simple and convenient for people to use. The detachable nature of the planting plate also facilitates the cleaning of the inside of the cultivation box to remove residual nutrient solution, soil, stains, bacteria, etc. This helps to maintain the hygiene and healthy environment inside the cultivation box, and avoid the breeding and spread of pests and diseases. Cleaning also helps to maintain the freshness and quality of the nutrient solution to support the healthy growth of crops.

[0004] In the above prior art, before soilless cultivation of lettuce, the lettuce seeds need to be germinated first, and then the germinated seeds are promoted to take root. After taking root, the lettuce seedlings need to be transferred to the cultivation device for continuous growth until the lettuce is mature. When transferring the rooted lettuce seedlings to the cultivation device, the lettuce seedlings need to be taken out of the original growth medium, and then the lettuce seedlings are transferred to the soilless cultivation device. During the transfer process, the roots of the lettuce seedlings may be damaged, thereby reducing the survival rate of the lettuce, and the transfer process is more cumbersome and the efficiency is low.

[0005] Therefore, the present invention provides a soilless cultivation device for lettuce. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: An soilless cultivation device for lettuce according to the present invention includes a number of round tubes. A number of round holes are provided at the upper end of the round tubes. L-shaped round tubes are fixedly connected to both sides of the round tubes respectively. A breeding component is provided in the middle of the round holes. The breeding component includes an arc-shaped filter screen provided in the middle of the round holes. The middle of the upper end of the arc-shaped filter screen is connected to a first ring through a sliding component. The sliding component is used to drive the first ring to slide longitudinally inside the arc-shaped filter screen. A circular sponge is installed in the middle of the first ring. A circular groove is provided in the middle of the upper end of the circular sponge. The circular groove is used to store seeds.

[0008] Preferably, the sliding component includes telescopic rods respectively rotatably connected to the four peripheries of the upper end of the arc-shaped filter screen. The ends of the telescopic rods away from the arc-shaped filter screen are jointly rotatably connected to the first ring.

[0009] Preferably, a second ring is fixedly connected to the lower end of the first ring. The inner diameter of the second ring is smaller than the diameter of the circular sponge.

[0010] Preferably, the telescopic rods located on both sides of the upper end of the arc-shaped filter screen are respectively rotatably connected to connecting rods. The upper ends of the connecting rods on the same straight line are jointly fixedly connected to a first rectangular strip. Second rectangular strips are respectively jointly fixedly connected to the side edges of a number of the first rectangular strips. Both sides of a number of the round tubes are fixedly connected through rectangular plates. A number of cylindrical strips are respectively fixedly connected to the upper ends of the rectangular plates. The second rectangular strips are slidably arranged outside the cylindrical strips.

[0011] Preferably, fourth rectangular strips are respectively slidably arranged outside the opposite two cylindrical strips. Drippers are respectively provided at the lower ends of the fourth rectangular strips corresponding to the positions of each arc-shaped filter screen.

[0012] Preferably, the upper ends of the drippers on the same straight line are jointly fixedly connected to a first connecting pipe. The first connecting pipe is internally connected to a number of the drippers. Both ends of a number of the first connecting pipes are jointly fixedly connected to a second connecting pipe. The second connecting pipe is internally connected to the first connecting pipe. Fifth rectangular strips are respectively jointly fixedly connected to both sides of a number of the fourth rectangular strips.

[0013] Preferably, a first rack is fixedly connected to the upper end of the second rectangular strip. A second rack is fixedly connected to the lower end of the fifth rectangular strip. The first rack meshes with a gear. The side of the gear away from the first rack meshes with the second rack. The gear is rotatably connected to a sixth rectangular strip through a pin shaft. The sixth rectangular strip slidably penetrates through the second rectangular strip and is fixedly connected to the rectangular plate.

[0014] Preferably, third rectangular bars are fixedly connected to the upper ends of the cylindrical bars on both sides. Clamping components are respectively arranged at positions corresponding to the first connecting pipes on one side of the third rectangular bars. The clamping components include first rectangular blocks fixedly connected to one side of the third rectangular bars. Two arc-shaped blocks are rotatably arranged at the lower ends of the first rectangular blocks through torsion springs. The two arc-shaped blocks are arranged in an inverted V shape, and the arc-shaped blocks are used for clamping the first connecting pipe.

[0015] Preferably, water pools are arranged at the lower ends of several of the round pipes. The two sides of the rectangular plate are fixedly connected to the water pools through L-shaped support blocks. The L-shaped round pipes arranged on both sides of the round pipes are respectively located inside the water pools.

[0016] Preferably, several through holes are arranged at the lower end of the arc-shaped filter screen. Ceramsite is placed inside the arc-shaped filter screen, and the ceramsite is used for filtering water quality.

[0017] The beneficial effects of the present invention are as follows: 1. For the soilless cultivation device for lettuce of the present invention, by placing lettuce seeds on the circular sponge to make the seeds take root, and then driving the first ring to drive the rooted lettuce seedlings to slide downward, so that the roots of the lettuce seedlings contact the water in the round pipe, providing more space for the growth of the lettuce roots, which can promote the further growth and health of the roots, solving the problems that it is more cumbersome to transfer the lettuce after it takes root, and the transfer process may cause damage to the lettuce roots, thereby reducing the survival rate of the lettuce.

[0018] 2. For the soilless cultivation device for lettuce of the present invention, by raising fish in the water pool, the fish are raised in the water pool, and their excreta and uneaten feed are deposited in the water. Starting the water pump to suck the water in the water pool into the round pipe through the L-shaped round pipe, using the excreta of the fish as organic fertilizer to supply the vegetables, and at the same time the roots of the vegetables absorb the nutrients in the water to purify the water quality. Then the water in the round pipe is discharged into the water pool again from the L-shaped round pipe on the other side, forming a circulation system, which not only saves water resources and land resources, but also reduces environmental pollution.

[0019] 3. For the soilless cultivation device for lettuce of the present invention, when driving the second rectangular bar to drive each lettuce seedling to move downward, the second rectangular bar drives the first rack to move downward, the first rack drives the gear to rotate, the gear rotates and drives the second rack to move upward at the same time, the second rack drives the fifth rectangular bar to move upward, and the fifth rectangular bar can drive each drip pipe to move upward, leaving enough space for the subsequent growth of the lettuce. Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings.

[0021] Figure 1 It is a three-dimensional view of Embodiment 1 of the present invention; Figure 2It is a schematic diagram of the installation of the arc-shaped filter screen; Figure 3 It is a schematic diagram of the upper-end structure of the arc-shaped filter screen; Figure 4 It is a schematic diagram of the position of the cylindrical bar; Figure 5 It is a schematic diagram of the position of the fourth rectangular bar; Figure 6 It is a schematic diagram of the position of the gear; Figure 7 It is a schematic diagram of the position of the dropper; In the figure: 1, circular tube; 11, round hole; 12, L-shaped circular tube; 13, arc-shaped filter screen; 131, telescopic rod; 132, first ring; 133, second ring; 134, circular sponge; 14, connecting rod; 141, first rectangular bar; 15, rectangular plate; 151, L-shaped support block; 16, second rectangular bar; 161, first rack; 17, cylindrical bar; 18, third rectangular bar; 181, first rectangular block; 182, arc-shaped block; 19, gear; 191, sixth rectangular bar; 2, water tank; 3, fourth rectangular bar; 31, fifth rectangular bar; 311, second rack; 32, dropper; 33, first connecting pipe; 34, second connecting pipe. Specific implementation mode

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.

[0023] Example 1, as Figures 1-3 shown, a soilless cultivation device for lettuce described in an embodiment of the present invention includes a plurality of circular tubes 1, a plurality of round holes 11 are opened at the upper ends of the circular tubes 1, L-shaped circular tubes 12 are fixedly connected to both sides of the circular tubes 1 respectively, a breeding component is arranged in the middle of the round holes 11, the breeding component includes an arc-shaped filter screen 13 arranged in the middle of the round holes 11, the middle of the upper end of the arc-shaped filter screen 13 is connected with a first ring 132 through a sliding component, the sliding component is used to drive the first ring 132 to longitudinally slide inside the arc-shaped filter screen 13, a circular sponge 134 is installed in the middle of the first ring 132, a circular groove is arranged in the middle of the upper end of the circular sponge 134, and the circular groove is used to store seeds.

[0024] Specifically, soilless cultivation of lettuce can avoid the occurrence of soil-borne diseases, ensure the healthy growth of lettuce, and is also convenient for management, eliminating the need for cumbersome operations such as turning the soil and fertilizing. Hydroponic lettuce can be cultivated in smaller spaces such as indoors and on balconies. Compared with traditional planting methods, hydroponic lettuce can greatly save planting space. Depending on different factors such as lettuce variety, nutrient concentration, and light, about 30 to 60 lettuce plants can be planted per square meter. Compared with traditional soil cultivation, the yield of hydroponic lettuce is higher. Hydroponic lettuce does not require tilling or replacing the soil, nor does it require watering and fertilizing in the traditional way, reducing the labor intensity and time cost. When carrying out soilless cultivation of lettuce, the lettuce seeds need to be germinated first, and then the germinated seeds are transferred to a rooting medium to allow the lettuce seeds to grow roots of a certain length and develop into lettuce seedlings. Subsequently, the lettuce seedlings are transferred to the interior of the cultivation device until the lettuce matures. When transferring the rooted lettuce seedlings to the cultivation device, the lettuce seedlings need to be taken out of the original growth medium. During the extraction process, the roots of the lettuce may be pulled, which may cause damage to the roots of the lettuce seedlings, thereby reducing the survival rate of the lettuce. When using this cultivation device, the germinated lettuce seeds are placed in the circular groove provided at the upper end of the circular sponge 134, and then the lettuce nutrient solution is mixed with water and poured on the seeds to keep the circular sponge 134 moist. The lettuce nutrient solution is composed of compounds such as calcium nitrate, potassium nitrate, magnesium sulfate, and ammonium dihydrogen phosphate. The nutrient solution and water are replenished regularly until the seeds grow roots of a certain length and develop into lettuce seedlings. The roots of the lettuce seedlings grow downward until they penetrate the circular sponge 134. At this time, water is injected into the tube 1 through the L-shaped circular tube 12, and then the first ring 132 is driven to move downward to drive the circular sponge 134 and the lettuce seedlings to move downward, so that the roots of the lettuce seedlings contact the water inside the tube 1. By placing the lettuce seeds on the circular sponge 134, the seeds take root, and then the first ring 132 is driven to drive the rooted lettuce seedlings to slide downward, so that the roots of the lettuce seedlings contact the water inside the tube 1, providing more space for the growth of the lettuce roots, promoting the further growth and health of the root system, and solving the problem that it is more cumbersome to transfer the lettuce after rooting, and the transfer process may cause damage to the roots of the lettuce, thereby reducing the survival rate of the lettuce.

[0025] As Figure 3 shown, the sliding component includes telescopic rods 131 respectively rotatably connected to the four peripheries of the upper end of the arc-shaped filter screen 13, and the ends of the telescopic rods 131 away from the arc-shaped filter screen 13 are commonly rotatably connected to the first ring 132.

[0026] Specifically, when it is necessary to move the rooted lettuce seeds into the inside of the circular tube 1 so that the lettuce roots contact the water, the telescopic rod 131 is driven to rotate downward. While rotating, the length of the telescopic rod 131 changes, driving the first ring 132 to move downward until the lettuce roots are driven to contact the water inside the circular tube 1. The distance between the lettuce roots and the water can be adjusted according to the growth of the lettuce. When the lettuce is mature, the first ring 132 is driven to slide upward to drive the circular sponge 134 and the lettuce to lift upward, facilitating harvesting.

[0027] As Figure 3 shown, a second ring 133 is fixedly connected to the lower end of the first ring 132, and the inner diameter of the second ring 133 is smaller than the diameter of the circular sponge 134.

[0028] Specifically, since the circular sponge 134 will increase in weight after absorbing water, by providing the second ring 133 at the lower end of the first ring 132, the circular sponge 134 can be prevented from slipping. At the same time, there is a space in the middle of the second ring 133 for the growth of the lettuce roots.

[0029] As Figures 3-4 shown, connecting rods 14 are respectively rotatably connected to the telescopic rods 131 on both sides of the upper ends of the arc-shaped filter screens 13. The upper ends of the connecting rods 14 on the same straight line are commonly fixedly connected to a first rectangular strip 141. Second rectangular strips 16 are respectively commonly fixedly connected to the sides of several first rectangular strips 141. Both sides of several circular tubes 1 are fixedly connected by rectangular plates 15. A plurality of cylindrical strips 17 are respectively fixedly connected to the upper ends of the rectangular plates 15. The second rectangular strips 16 are slidably arranged outside the cylindrical strips 17.

[0030] Specifically, when cultivating or harvesting the same batch of lettuce seeds, the efficiency of individual harvesting or seedling raising is relatively low. By driving the second rectangular strip 16 to drive several first rectangular strips 141 to move downward, and at the same time driving several telescopic rods 131 to rotate downward through the connecting rods 14, the telescopic rods 131 drive several first rings 132 to move downward at the same time, which can drive the lettuce seedlings placed on the upper ends of the circular sponges 134 to move downward at the same time, and can lift the mature lettuce upward at the same time, facilitating harvesting.

[0031] As Figures 5-7 shown, fourth rectangular strips 3 are respectively slidably arranged outside the opposite two cylindrical strips 17, and droppers 32 are respectively provided at the lower ends of the fourth rectangular strips 3 corresponding to the positions of the respective arc-shaped filter screens 13.

[0032] Specifically, when rooting the lettuce seeds, it is necessary to regularly irrigate the lettuce seeds with nutrient solution and water. By providing droppers 32 above the corresponding lettuce seeds, the flow rate of the droppers 32 is set to quantitatively drop the nutrient solution on the lettuce seeds, keeping the lettuce always moist and promoting rooting.

[0033] AsFigure 7 As shown, at the upper ends of the droppers 32 located on the same straight line, a first connecting pipe 33 is fixedly connected in common. The first connecting pipe 33 is internally connected to several droppers 32. At both ends of several first connecting pipes 33, a second connecting pipe 34 is fixedly connected in common. The second connecting pipe 34 is internally connected to the first connecting pipe 33. On both sides of several fourth rectangular strips 3, fifth rectangular strips 31 are fixedly connected in common respectively.

[0034] Specifically, by introducing nutrient solution and water into the second connecting pipe 34, and then into each dropper 32 through the first connecting pipe 33, and then watering each lettuce seed. After the lettuce seeds take root, move the lettuce seedlings downward so that the roots of the lettuce seedlings contact the water in the circular pipe 1. Subsequently, drive the fifth rectangular strip 31 to drive each dropper 32 to move upward through several fourth rectangular strips 3, leaving enough space for the subsequent growth of the lettuce after moving the droppers 32 upward.

[0035] As Figure 6 shown, a first rack 161 is fixedly connected to the upper end of the second rectangular strip 16. A second rack 311 is fixedly connected to the lower end of the fifth rectangular strip 31. The first rack 161 meshes with a gear 19. The side of the gear 19 away from the first rack 161 meshes with the second rack 311. The gear 19 is rotatably connected to a sixth rectangular strip 191 through a pin shaft. The sixth rectangular strip 191 slidably penetrates through the second rectangular strip 16 and is fixedly connected to a rectangular plate 15.

[0036] Specifically, when driving the second rectangular strip 16 to drive each lettuce seedling to move downward, the second rectangular strip 16 drives the first rack 161 to move downward. The first rack 161 drives the gear 19 to rotate. While the gear 19 rotates, it drives the second rack 311 to move upward. The second rack 311 drives the fifth rectangular strip 31 to move upward. The fifth rectangular strip 31 can drive each dropper 32 to move upward, leaving enough space for the growth of the lettuce.

[0037] As Figure 7 shown, third rectangular strips 18 are fixedly connected in common to the upper ends of the cylindrical strips 17 on both sides. Clamping components are respectively arranged at positions corresponding to the first connecting pipes 33 on one side of the third rectangular strips 18. The clamping components include a first rectangular block 181 fixedly connected to one side of the third rectangular strip 18. Two arc-shaped blocks 182 are rotatably arranged at the lower end of the first rectangular block 181 through torsion springs. The two arc-shaped blocks 182 are arranged in an inverted V shape. The arc-shaped blocks 182 are used to clamp the first connecting pipe 33.

[0038] Specifically, when the fifth rectangular strip 31 drives the fourth rectangular strip 3 to move upward, it simultaneously drives the first connecting pipe 33 to move upward. After the first connecting pipe 33 moves to the upper end, it slides between the two arc-shaped blocks 182 to clamp the first connecting pipe 33, stopping the droppers 32 from watering the lettuce seedlings.

[0039] Embodiment 2, as Figure 2 shown, compared with Embodiment 1, another implementation manner of the present invention is: a water pool 2 is provided at the lower ends of several of the round tubes 1, both sides of the rectangular plate 15 are fixedly connected to the water pool 2 through L-shaped support blocks 151, and the L-shaped round tubes 12 provided on both sides of the round tube 1 are respectively located inside the water pool 2.

[0040] Specifically, the water pool 2 is used for fish farming. Fishes are cultured in the water pool 2, and their excrements and uneaten feeds are deposited in the water. The water pump is started to suck the water in the water pool 2 into the round tube 1 through the L-shaped round tube 12. The excrements of the fishes are used as organic fertilizers to supply vegetables, and at the same time, the root systems of the vegetables absorb the nutrients in the water to purify the water quality. Subsequently, the water in the round tube 1 is discharged into the water pool 2 again through the L-shaped round tube 12 on the other side, forming a circulation system, which not only saves water resources and land resources, but also reduces environmental pollution.

[0041] As Figure 3 shown, a plurality of through holes are provided at the lower end of the arc-shaped filter screen 13, and ceramsite is placed inside the arc-shaped filter screen 13, and the ceramsite is used for filtering the water quality.

[0042] Specifically, by placing ceramsite in the arc-shaped filter screen 13, the ceramsite can fix the root systems of lettuce, prevent the root systems from floating in the hydroponic container, ensure that the root systems can grow stably. The porous structure of the ceramsite can store a small amount of water and nutrients, help maintain the stability of the root growth environment, and reduce the influence of external environmental changes on the root systems. The ceramsite has good air permeability, can reduce the phenomenon of root rot, and ensure the health of the plant roots.

[0043] Working principle: When carrying out soilless cultivation of lettuce, it is necessary to germinate the lettuce seeds first, and then transfer the germinated seeds to the rooting medium to make the lettuce seeds grow roots of a certain length and grow into lettuce seedlings. Subsequently, the germinated lettuce seeds are placed inside the circular groove provided at the upper end of the circular sponge 134. By introducing nutrient solution and water into the second connecting pipe 34 and then into each drip pipe 32 through the first connecting pipe 33, each lettuce seed is then watered until the lettuce seeds grow into lettuce seedlings; Drive the second rectangular strip 16 to drive several first rectangular strips 141 to move downward, and at the same time drive several telescopic rods 131 to rotate downward through the connecting rod 14. While rotating, the length of the telescopic rod 131 changes, driving the first ring 132 to move downward until the lettuce roots contact the water inside the round tube 1. The distance between the lettuce roots and the water can be adjusted according to the growth of the lettuce, and the lettuce seedlings placed on the upper end of the circular sponge 134 can be driven to move downward at the same time. When the lettuce is mature, the mature lettuce can be lifted upward at the same time, which is convenient for harvesting; The water tank 2 is used for fish farming. Fish are farmed in the water tank 2, and their excrements and uneaten feed deposit in the water. Start the water pump to suck the water in the water tank 2 into the circular tube 1 through the L-shaped circular tube 12. After moving the lettuce seedlings downward, make the lettuce roots contact the water inside the circular tube 1. Use the excrements of fish as organic fertilizer to supply vegetables. At the same time, the root systems of vegetables absorb nutrients in the water to purify the water quality. Subsequently, the water in the circular tube 1 is discharged back into the water tank 2 through the L-shaped circular tube 12 on the other side, forming a circulation system; At the same time, by placing ceramsite in the arc-shaped filter screen 13, the ceramsite can fix the lettuce root systems, prevent the root systems from floating in the hydroponic container, and ensure the stable growth of the root systems. The porous structure of the ceramsite can store a small amount of water and nutrients, help maintain the stability of the growth environment of the root systems, and reduce the influence of external environmental changes on the root systems. The ceramsite has good air permeability, can reduce the phenomenon of root rot, and ensure the health of the plant roots; When driving the second rectangular bar 16 to drive each lettuce seedling to move downward, the second rectangular bar 16 drives the first rack 161 to move downward. The first rack 161 drives the gear 19 to rotate. While the gear 19 rotates, it drives the second rack 311 to move upward. The second rack 311 drives the fifth rectangular bar 31 to move upward. The fifth rectangular bar 31 can drive each drip pipe 32 to move upward, leaving enough space for the growth of lettuce. When the fifth rectangular bar 31 drives the fourth rectangular bar 3 to move upward, it also drives the first connecting pipe 33 to move upward. After the first connecting pipe 33 moves to the upper end, it slides between the two arc-shaped blocks 182, and the first connecting pipe 33 is clamped to stop the drip pipe 32 from watering the lettuce seedlings.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A lettuce soilless cultivation device, comprising a plurality of circular tubes (1), a plurality of circular holes (11) being formed at the upper ends of the circular tubes (1), L-shaped circular tubes (12) being fixedly connected to both sides of the circular tubes (1), a breeding assembly being provided in the middle of the circular holes (11), characterized in that: The breeding component comprises an arc-shaped filter (13) provided in the middle of the circular hole (11); a first circular ring (132) is connected to the middle of the upper end of the arc-shaped filter (13) via a sliding component; the sliding component is used to drive the first circular ring (132) to slide longitudinally inside the arc-shaped filter (13); a circular sponge (134) is installed in the middle of the first circular ring (132); a circular groove is provided in the middle of the upper end of the circular sponge (134); the circular groove is used to store seeds.

2. The soilless culture device for lettuce according to claim 1, characterized in that: The sliding assembly comprises telescopic rods (131) rotatably connected to the four sides of the upper end of the arc-shaped filter screen (13), and one end of the telescopic rod (131) away from the arc-shaped filter screen (13) is rotatably connected to the first ring (132).

3. The soilless culture device for lettuce according to claim 2, characterized in that: A second circular ring (133) is fixedly connected to the lower end of the first circular ring (132), and the inner diameter of the second circular ring (133) is smaller than the diameter of the circular sponge (134).

4. The soilless culture device for lettuce according to claim 3, characterized in that: The telescopic rods (131) located on both sides of the upper end of the arc-shaped filter (13) are rotatably connected to connecting rods (14), the upper ends of the connecting rods (14) on the same straight line are commonly fixedly connected to a first rectangular bar (141), the sides of a plurality of the first rectangular bars (141) are commonly fixedly connected to a second rectangular bar (16), the two sides of a plurality of the circular tubes (1) are fixedly connected via a rectangular plate (15), the upper ends of the rectangular plates (15) are respectively fixedly connected to a plurality of cylindrical bars (17), and the second rectangular bars (16) are slidably arranged on the outside of the cylindrical bars (17).

5. The soilless culture device for lettuce according to claim 4, characterized in that: Fourth rectangular bars (3) are slidably arranged on the outside of the two cylindrical bars (17), and droppers (32) are respectively arranged at the positions of the lower ends of the fourth rectangular bars (3) corresponding to the positions of the arc-shaped filter screens (13).

6. The soilless culture device for lettuce according to claim 5, characterized in that: The upper ends of the droppers (32) located on the same straight line are commonly fixedly connected to a first connecting tube (33), the first connecting tube (33) is communicated with the interior of a plurality of droppers (32), the two ends of a plurality of the first connecting tubes (33) are commonly fixedly connected to a second connecting tube (34), the second connecting tube (34) is communicated with the interior of the first connecting tube (33), and both sides of a plurality of the fourth rectangular strips (3) are commonly fixedly connected to a fifth rectangular strip (31).

7. The soilless culture device for lettuce according to claim 6, characterized in that: The upper end of the second rectangular bar (16) is fixedly connected to a first rack (161), the lower end of the fifth rectangular bar (31) is fixedly connected to a second rack (311), the first rack (161) is meshed with a gear (19), the gear (19) is meshed with the second rack (311) on a side away from the first rack (161), the gear (19) is rotatably connected to the sixth rectangular bar (191) via a pin, the sixth rectangular bar (191) slides through the second rectangular bar (16) and is fixedly connected to the rectangular plate (15).

8. The soilless culture device for lettuce according to claim 7, characterized in that: The upper ends of the cylindrical bars (17) on both sides are respectively fixedly connected to a third rectangular bar (18), and a clamping assembly is respectively provided at a position corresponding to the first connecting tube (33) on one side of the third rectangular bar (18), and the clamping assembly comprises a first rectangular block (181) fixedly connected to one side of the third rectangular bar (18), and two arc blocks (182) are rotatably arranged at the lower end of the first rectangular block (181) through a torsion spring, and the two arc blocks (182) are arranged in an inverted V shape, and the arc blocks (182) are used to clamp the first connecting tube (33).

9. The soilless culture device for lettuce according to claim 4, characterized in that: A water pool (2) is provided at the lower end of the plurality of circular tubes (1), and both sides of the rectangular plate (15) are fixedly connected to the water pool (2) via L-shaped support blocks (151), and the L-shaped circular tubes (12) provided on both sides of the circular tube (1) are respectively located inside the water pool (2).

10. The soilless culture device for lettuce according to claim 9, characterized in that: A plurality of through holes are provided at the lower end of the arc-shaped filter screen (13), and ceramsite is placed inside the arc-shaped filter screen (13), and the ceramsite is used to filter water.

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