Lettuce soilless cultivation device

Abstract

The present invention belongs to the technical field of lettuce cultivation, and specifically is a soilless cultivation device for lettuce, comprising a plurality of circular tubes, wherein a plurality of circular holes are opened at the upper ends of the circular tubes, L-shaped circular tubes are fixedly connected on both sides of the circular tubes, a breeding component is provided in the middle of the circular holes, and the breeding component comprises an arc-shaped filter screen provided in the middle of the circular hole, a first circular ring is connected to the middle of the upper end of the arc-shaped filter screen through a sliding component, and the sliding component is used to drive the first circular ring to slide longitudinally inside the arc-shaped filter screen, a circular sponge is installed in the middle of the first circular ring, a circular groove is provided in the middle of the upper end of the circular sponge, and the circular groove is used to store seeds, and the lettuce seeds are placed on the circular sponge to make the seeds take root, and then the first circular ring is driven to drive the rooted lettuce seedlings to slide downward, so that the roots of the lettuce seedlings contact the water in the circular tube, thereby solving the problem that the lettuce transfer process may cause damage to the lettuce roots, thereby reducing the survival rate of the lettuce.

Description

Technical Field

[0001] The invention belongs to the technical field of lettuce cultivation, in particular to a soilless cultivation device for lettuce. Background Art

[0002] Soilless culture refers to a cultivation method in which water, peat, forest leaf mold, vermiculite and other media are used as the substrate for the plant roots to fix the plants, so that the plant roots can directly contact the nutrient solution. The composition of the nutrient solution in soilless culture is easy to control and can be adjusted at any time. In places with suitable light and temperature but 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 culture is divided into hydroponics, mist (aerosol) culture and matrix culture according to the different cultivation media. Hydroponics refers to a cultivation method in which the plant roots are in direct contact with the nutrient solution without the use of a matrix.

[0003] A patent application with publication number CN220987025U discloses a soilless lettuce cultivation device. Through the coordinated use of longitudinal pull rods, a circular positioning frame, a positioning rod, a positioning slot, a spring, and a fixing slot, and the detachable planting plate, it facilitates the later harvesting of mature lettuce. The detachable structure of the planting plate is simple to operate and convenient for people to use. The detachable planting plate also facilitates the cleaning of the interior of the incubator to remove residual nutrient solution, soil, stains, and bacteria. This helps maintain a hygienic and healthy environment inside the incubator and prevents the breeding and spread of pests and diseases. Cleaning also helps maintain the freshness and quality of the nutrient solution to support healthy crop growth.

[0004] In the above-mentioned prior art, before soilless cultivation of lettuce, the lettuce seeds need to be germinated first, and then the germinated seeds need to be promoted to take root. After taking root, the lettuce seedlings need to be transferred to a cultivation device to allow the lettuce seedlings to continue growing until the lettuce matures. When the rooted lettuce seedlings are transferred to the cultivation device, the lettuce seedlings need to be taken out of the original growth medium and then 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. In addition, the transfer process is relatively cumbersome and inefficient.

[0005] To this end, the present invention provides a soilless culture device for lettuce. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the soilless cultivation device of lettuce described in the present invention includes several circular tubes, several circular holes are opened at the upper end of the circular tubes, L-shaped circular tubes are fixedly connected on both sides of the circular tubes, and a breeding component is provided in the middle of the circular hole. The breeding component includes an arc-shaped filter screen provided in the middle of the circular hole, and the middle part of the upper end of the arc-shaped filter screen is connected to a first circular ring through a sliding component. The sliding component is used to drive the first circular ring to slide longitudinally inside the arc-shaped filter screen. A circular sponge is installed in the middle of the first circular ring, and 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 assembly includes telescopic rods rotatably connected to the four sides of the upper end of the arc-shaped filter screen, and one end of the telescopic rods away from the arc-shaped filter screen is rotatably connected to the first ring.

[0009] Preferably, a second circular ring is fixedly connected to the lower end of the first circular ring, and the inner diameter of the second circular 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 are rotatably connected to connecting rods respectively, the upper ends of the connecting rods on the same straight line are commonly fixed with a first rectangular bar, and the sides of several of the first rectangular bars are commonly fixed with a second rectangular bar respectively, and the two sides of several of the circular tubes are fixed by rectangular plates, and the upper ends of the rectangular plates are respectively fixed with several cylindrical bars, and the second rectangular bars are slidably arranged on the outside of the cylindrical bars.

[0011] Preferably, a fourth rectangular bar is slidably provided on the outer sides of the two cylindrical bars, and a dropper is provided at the lower end of the fourth rectangular bar corresponding to the position of each arc-shaped filter screen.

[0012] Preferably, the upper ends of the droppers located on the same straight line are commonly fixed with a first connecting tube, the first connecting tube is connected to the interior of several droppers, the two ends of several first connecting tubes are commonly fixed with a second connecting tube, the second connecting tube is connected to the interior of the first connecting tube, and the two sides of several fourth rectangular strips are commonly fixed with a fifth rectangular strip.

[0013] Preferably, the upper end of the second rectangular bar is fixed with a first rack, the lower end of the fifth rectangular bar is fixed with a second rack, the first rack is meshed with a gear, the gear is meshed with the second rack on the side away from the first rack, the gear is rotatably connected to the sixth rectangular bar through a pin shaft, the sixth rectangular bar slides through the second rectangular bar and is fixed to the rectangular plate.

[0014] Preferably, the upper ends of the cylindrical bars on both sides are respectively fixed with a third rectangular bar, and a clamping assembly is respectively provided at a position corresponding to the first connecting tube on one side of the third rectangular bar, and the clamping assembly includes a first rectangular block fixed with one side of the third rectangular bar, and two arc blocks are provided at the lower end of the first rectangular block through rotation of a torsion spring, and the two arc blocks are arranged in an inverted V shape, and the arc blocks are used to clamp the first connecting tube.

[0015] Preferably, a water pool is provided at the lower end of several of the circular tubes, and both sides of the rectangular plate are fixedly connected to the water pool via L-shaped support blocks, and the L-shaped circular tubes provided on both sides of the circular tube are respectively located inside the water pool.

[0016] Preferably, a plurality of through holes are provided at the lower end of the arc-shaped filter screen, and ceramsite is placed inside the arc-shaped filter screen, and the ceramsite is used to filter water.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The soilless cultivation device for lettuce described in the present invention places lettuce seeds on a circular sponge to allow the seeds to take root, and then drives the first circular ring to drive the rooted lettuce seedlings to slide downward, so that the roots of the lettuce seedlings contact the water in the circular tube, giving the lettuce roots more space to grow, which can promote further growth and health of the root system. This solves the problem of transferring the lettuce after it takes root, which is cumbersome and may damage the lettuce roots during the transfer process, thereby reducing the survival rate of the lettuce.

[0019] 2. The soilless cultivation device for lettuce described in the present invention cultivates fish in a pool. The fish excrement and uneaten feed are deposited in the water. The water in the pool is sucked into the pool through an L-shaped circular tube by starting a water pump. The fish excrement is used as organic fertilizer to supply the vegetables. At the same time, the roots of the vegetables absorb nutrients in the water to purify the water quality. The water in the circular tube is then discharged into the pool again from the L-shaped circular tube on the other side, forming a circulation system. This not only saves water and land resources, but also reduces environmental pollution.

[0020] 3. The soilless cultivation device for lettuce described in the present invention drives the second rectangular bar to move each lettuce seedling downward, and the second rectangular bar drives the first rack to move downward, the first rack drives the gear to rotate, and the gear rotation simultaneously drives the second rack to move upward, the second rack drives the fifth rectangular bar to move upward, and the fifth rectangular bar can drive each drip tube to move upward, leaving enough space for the subsequent growth of the lettuce. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a perspective view of embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation of the curved filter;

[0024] Figure 3 This is a schematic diagram of the upper structure of the curved filter;

[0025] Figure 4 It is a schematic diagram of the position of the cylindrical strip;

[0026] Figure 5 is a schematic diagram of the position of the fourth rectangular bar;

[0027] Figure 6 It is a schematic diagram of the gear positions;

[0028] Figure 7 It is a schematic diagram of the dropper position;

[0029] In the figure: 1. round tube; 11. round hole; 12. L-shaped round tube; 13. curved filter; 131. telescopic rod; 132. first circular ring; 133. second circular 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. curved block; 19. gear; 191. sixth rectangular bar; 2. pool; 3. fourth rectangular bar; 31. fifth rectangular bar; 311. second rack; 32. dropper; 33. first connecting pipe; 34. second connecting pipe. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] Example 1, as Figure 1-Figure 3 As shown, a soilless cultivation device for lettuce described in an embodiment of the present invention includes several circular tubes 1, several circular holes 11 are opened at the upper end of the circular tubes 1, L-shaped circular tubes 12 are fixedly connected on both sides of the circular tubes 1, and a breeding component is provided in the middle of the circular hole 11. The breeding component includes an arc-shaped filter screen 13 provided in the middle of the circular hole 11, and the middle part of the upper end of the arc-shaped filter screen 13 is connected to a first circular ring 132 through a sliding component. The sliding component is used to drive the first circular ring 132 to slide longitudinally inside the arc-shaped filter screen 13, and a circular sponge 134 is installed in the middle of the first circular ring 132, and a circular groove is provided in the middle of the upper end of the circular sponge 134, and the circular groove is used to store seeds.

[0032] Specifically, soilless cultivation of lettuce can avoid the occurrence of soil infectious diseases and ensure the healthy growth of lettuce. It is also convenient to manage and does not require tedious operations such as turning the soil and applying fertilizers. Hydroponic lettuce can be cultivated in smaller spaces such as indoors and balconies. Compared with traditional planting methods, hydroponic lettuce can greatly save planting space. Depending on the variety of lettuce, nutrient concentration, light and other factors, about 30 to 60 plants of lettuce can be planted per square meter. Compared with traditional soil farming, hydroponic lettuce has a higher yield. Hydroponic lettuce does not require turning the soil, replacing the soil, or traditional methods. The watering and fertilizing method is simple and easy to use, which reduces the labor and time cost. When carrying out soilless cultivation of lettuce, the lettuce seeds need to be germinated first, and then the germinated seeds need to be transferred to the rooting medium to make the lettuce seeds grow roots of a certain length and grow into lettuce seedlings. The lettuce seedlings are then transferred to the inside of the cultivation device until the lettuce is mature. When the rooted lettuce seedlings are transferred to the cultivation device, the lettuce seedlings need to be taken out from the original growth medium. During the removal 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 lettuce is low. When using the cultivation device, the germinated lettuce seeds are placed in the circular groove provided on 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 a compound such as calcium nitrate, potassium nitrate, magnesium sulfate and diammonium phosphate. The nutrient solution and water are regularly replenished until the seeds grow roots of a certain length and grow 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 interior of the circular tube 1 through the L-shaped circular tube 12, and then the first circular ring is driven. 132 drives the circular sponge 134 and the lettuce seedlings downward, so that the roots of the lettuce seedlings contact the water inside the circular tube 1. By placing the lettuce seeds on the circular sponge 134 to make the seeds take root, the first circular ring 132 is then driven to drive the rooted lettuce seedlings to slide downward, so that the roots of the lettuce seedlings contact the water in the circular tube 1, so that the roots of the lettuce have more space to grow, which can promote the further growth and health of the root system, and solves the problem of transferring the lettuce after it takes root, which is more cumbersome and the transfer process may cause damage to the roots of the lettuce, thereby reducing the survival rate of the lettuce.

[0033] like Figure 3 As shown, the sliding assembly includes telescopic rods 131 rotatably connected to four sides of the upper end of the arc-shaped filter screen 13 , and one end of the telescopic rods 131 away from the arc-shaped filter screen 13 is rotatably connected to the first ring 132 .

[0034] Specifically, when it is necessary to move the rooted lettuce seeds into the inside of the circular tube 1 so that the roots of the lettuce come into contact with water, the telescopic rod 131 is driven to rotate downward. During the rotation, the length of the telescopic rod 131 changes, driving the first circular ring 132 to move downward until the roots of the lettuce come into contact with the water inside the circular tube 1. The distance between the roots of the lettuce and the water can be adjusted according to the growth of the lettuce. When the lettuce is mature, the first circular ring 132 is driven to slide upward to drive the circular sponge 134 and the lettuce to be lifted upward for easy harvesting.

[0035] like Figure 3 As shown, 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 .

[0036] Specifically, since the circular sponge 134 will increase in weight after absorbing water, the second circular ring 133 is provided at the lower end of the first circular ring 132 to prevent the circular sponge 134 from sliding off, while a space is left in the middle of the second circular ring 133 for the growth of lettuce roots.

[0037] like Figure 3-Figure 4 As shown, the telescopic rods 131 located on both sides of the upper end of the arc-shaped filter 13 are respectively rotatably connected to the connecting rods 14, and the upper ends of the connecting rods 14 on the same straight line are commonly fixed with a first rectangular bar 141, and the sides of several first rectangular bars 141 are respectively commonly fixed with a second rectangular bar 16, and the two sides of several circular tubes 1 are fixed by a rectangular plate 15, and the upper ends of the rectangular plates 15 are respectively fixed with several cylindrical bars 17, and the second rectangular bars 16 are slidably arranged on the outside of the cylindrical bar 17.

[0038] Specifically, when cultivating or harvesting the same batch of lettuce seeds, the efficiency of single harvesting or seedling raising is low. By driving the second rectangular bar 16 to move the plurality of first rectangular bars 141 downward, the connecting rod 14 drives the plurality of telescopic rods 131 to rotate downward at the same time. The telescopic rod 131 drives the plurality of first circular rings 132 downward at the same time, and can simultaneously drive the lettuce seedlings placed on the upper end of the circular sponge 134 to move downward, and can simultaneously lift the mature lettuce upward for easy harvesting.

[0039] like Figure 5-Figure 7 As shown, fourth rectangular bars 3 are respectively slidably arranged on the outside of the two cylindrical bars 17 , and droppers 32 are respectively provided at the lower ends of the fourth rectangular bars 3 corresponding to the positions of the respective arc-shaped filter screens 13 .

[0040] Specifically, when promoting the roots of lettuce seeds, the lettuce seeds need to be regularly irrigated with nutrient solution and water. By setting a dropper 32 above each lettuce seed, the flow rate of the dropper 32 is set to quantitatively drip the nutrient solution onto the lettuce seeds, so that the lettuce is always kept moist and rooting is promoted.

[0041] like Figure 7 As shown, 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 several droppers 32, the two ends of several 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 the two sides of several fourth rectangular bars 3 are commonly fixedly connected to a fifth rectangular bar 31.

[0042] Specifically, the nutrient solution and water are passed into the second connecting pipe 34 and then into each dropper 32 through the first connecting pipe 33, and then each lettuce seed is watered. After the lettuce seeds take root, the lettuce seedlings are moved downward so that the roots of the lettuce seedlings contact the water in the circular tube 1. Then, the fifth rectangular bar 31 is driven to drive each dropper 32 to move upward through several fourth rectangular bars 3. After the dropper 32 is moved upward, sufficient space is left for the subsequent growth of the lettuce.

[0043] like Figure 6 As shown, the upper end of the second rectangular bar 16 is fixed with a first rack 161, the lower end of the fifth rectangular bar 31 is fixed with a second rack 311, the first rack 161 is meshed with a gear 19, and the gear 19 is meshed with the second rack 311 on the side away from the first rack 161. The gear 19 is rotatably connected to the sixth rectangular bar 191 through a pin shaft, and the sixth rectangular bar 191 slides through the second rectangular bar 16 and is fixed to the rectangular plate 15.

[0044] Specifically, when the second rectangular bar 16 is driven to drive the lettuce seedlings 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, and the gear 19 rotates and drives the second rack 311 to move upward at the same time. The second rack 311 drives the fifth rectangular bar 31 to move upward, and the fifth rectangular bar 31 can drive each dropper 32 to move upward, leaving enough space for the lettuce to grow.

[0045] like Figure 7 As shown, the upper ends of the cylindrical bars 17 on both sides are respectively fixed with a third rectangular bar 18, and a clamping assembly is provided at a position corresponding to the first connecting tube 33 on one side of the third rectangular bar 18. The clamping assembly includes a first rectangular block 181 fixed to one side of the third rectangular bar 18, and two arc blocks 182 are provided at the lower end of the first rectangular block 181 through rotation of a torsion spring. 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.

[0046] Specifically, when the fifth rectangular bar 31 drives the fourth rectangular bar 3 to move upward, it also drives the first connecting tube 33 to move upward. After the first connecting tube 33 moves to the upper end, it slides between the two arc-shaped blocks 182, clamping the first connecting tube 33, so that the dropper 32 stops watering the lettuce seedlings.

[0047] Example 2, as Figure 2 As shown, in contrast to Example 1, another embodiment of the present invention is: 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 through 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.

[0048] Specifically, the pool 2 is used for breeding fish. The fish are bred in the pool 2, and their excrement and uneaten feed are deposited in the water. The water pump is started to suck the water in the pool 2 into the circular tube 1 through the L-shaped circular tube 12. The fish excrement is used as organic fertilizer to supply vegetables. At the same time, the roots of the vegetables absorb nutrients in the water and purify the water quality. Then the water in the circular tube 1 is discharged into the pool 2 again from the L-shaped circular tube 12 on the other side, forming a circulation system. It not only saves water and land resources, but also reduces environmental pollution.

[0049] like Figure 3 As 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 to filter water.

[0050] Specifically, by placing ceramsite in the arc-shaped filter 13, the ceramsite can fix the roots of the lettuce, prevent the roots from floating in the hydroponic container, and ensure that the roots can grow stably. The porous structure of the ceramsite can store a small amount of water and nutrients, helping to maintain a stable growth environment for the roots and reduce the impact of external environmental changes on the roots. The good air permeability of the ceramsite can reduce root rot and ensure the health of the plant roots.

[0051] Working principle: When carrying out soilless cultivation of lettuce, it is necessary to first germinate the lettuce seeds, then transfer the germinated seeds to a rooting medium, so that the lettuce seeds grow roots of a certain length and the seeds grow into lettuce seedlings, and then place the germinated lettuce seeds in the circular groove provided at the upper end of the circular sponge 134, pass the nutrient solution and water into the second connecting pipe 34, and then pass them into each dropper 32 through the first connecting pipe 33, and then water each lettuce seed until the lettuce seeds grow into lettuce seedlings;

[0052] The second rectangular strip 16 is driven to move the plurality of first rectangular strips 141 downward, and at the same time, the plurality of telescopic rods 131 are driven to rotate downward simultaneously through the connecting rod 14. As the telescopic rods 131 rotate, the lengths of the telescopic rods 131 change, driving the first circular ring 132 downward until the roots of the lettuce touch the water inside the circular tube 1. The distance between the roots of the lettuce and the water can be adjusted according to the growth of the lettuce. At the same time, the lettuce seedlings placed on the upper end of the circular sponge 134 can be driven downward. When the lettuce is mature, the mature lettuce can be lifted up at the same time for easy harvesting.

[0053] Pool 2 is used for fish farming. The fish are farmed in pool 2, and their excrement and uneaten feed are deposited in the water. The water pump is started to suck the water in pool 2 into circular tube 1 through L-shaped circular tube 12. After the lettuce seedlings are moved downward, the roots of the lettuce are exposed to the water inside circular tube 1. The fish excrement is used as organic fertilizer to supply the vegetables. At the same time, the roots of the vegetables absorb nutrients in the water, purifying the water quality. Then, the water in circular tube 1 is discharged back into pool 2 through the L-shaped circular tube 12 on the other side, forming a circulation system.

[0054] At the same time, by placing ceramsite in the curved filter 13, the ceramsite can fix the lettuce roots, preventing them from floating in the hydroponic container, ensuring stable root growth. The porous structure of the ceramsite can store a small amount of water and nutrients, helping to maintain a stable growth environment for the roots and reducing the impact of external environmental changes on the roots. The ceramsite has good air permeability, which can reduce root rot and ensure the health of the plant roots.

[0055] When the second rectangular bar 16 is driven to move each lettuce seedling downward, the second rectangular bar 16 drives the first rack 161 to move downward, and the first rack 161 drives the gear 19 to rotate. The rotation of the gear 19 simultaneously drives the second rack 311 to move upward, and the second rack 311 drives the fifth rectangular bar 31 to move upward. The fifth rectangular bar 31 can drive each dropper 32 to move upward, leaving enough space for the lettuce to grow. When the fifth rectangular bar 31 drives the fourth rectangular bar 3 to move upward, it also drives the first connecting tube 33 to move upward. After the first connecting tube 33 moves to the upper end, it slides between the two arc blocks 182, clamping the first connecting tube 33, so that the dropper 32 stops watering the lettuce seedlings.

[0056] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A soilless culture device for lettuce, comprising a plurality of circular tubes (1), wherein a plurality of circular holes (11) are formed 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), and a breeding component is provided in the middle of the circular holes (11), characterized in that: The breeding component includes 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) through a sliding component, and 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), and a circular groove is provided in the middle of the upper end of the circular sponge (134), and the circular groove is used to store seeds; The sliding assembly comprises telescopic rods (131) rotatably connected to the four sides of the upper end of the arc-shaped filter (13), and one end of the telescopic rod (131) away from the arc-shaped filter (13) is rotatably connected to the first ring (132); 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); The telescopic rods (131) located on both sides of the upper end of the arc-shaped filter (13) are rotatably connected to the 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 by 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); A fourth rectangular strip (3) is slidably provided on the outside of the two cylindrical strips (17), and a dropper (32) is provided at the lower end of the fourth rectangular strip (3) at a position corresponding to each of the arc-shaped filter screens (13); 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 the plurality of 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 the two sides of the plurality of fourth rectangular strips (3) are commonly fixedly connected to a fifth rectangular strip (31).

2. The soilless culture device for lettuce according to claim 1, characterized in that: The upper end of the second rectangular bar (16) is fixedly connected to the first rack (161), the lower end of the fifth rectangular bar (31) is fixedly connected to the second rack (311), the first rack (161) is meshed with a gear (19), the gear (19) is meshed with the second rack (311) on the side away from the first rack (161), the gear (19) is rotatably connected to the sixth rectangular bar (191) through a pin shaft, and the sixth rectangular bar (191) slides through the second rectangular bar (16) and is fixedly connected to the rectangular plate (15).

3. The soilless culture device for lettuce according to claim 1, 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 includes a first rectangular block (181) fixedly connected to one side of the third rectangular bar (18), and two arc blocks (182) are provided at the lower end of the first rectangular block (181) through rotation of 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).

4. The soilless culture device for lettuce according to claim 1, characterized in that: A water pool (2) is provided at the lower end of the plurality of circular tubes (1), 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).

5. The soilless culture device for lettuce according to claim 4, 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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