Cadmium-reducing rice seedling raising device

Abstract

The invention belongs to the technical field of rice seedling raising devices, and particularly discloses a cadmium-reducing rice seedling raising device, which comprises a seedling raising tray, a plurality of seedling raising grids and a plurality of seedling raising trays, the bottom plate is detachably connected to the bottom of the seedling raising plate, and a plurality of water inlet holes are evenly formed in the positions, right opposite to the seedling raising grids, of the bottom plate. And the dredging device comprises a base, an inserting rod and a liquid pressing assembly, the base is horizontally arranged at the bottom of the bottom plate, and a plurality of supporting assemblies are symmetrically arranged between the edge position of the top of the base and the bottom plate. By arranging the dredging device, when a rice root system or a culture medium in the seedling raising plate blocks the water inlet holes of the bottom plate, a worker can press the seedling raising plate downwards, at the moment, the insertion rods can be accurately inserted into the corresponding water inlet holes, blockages are removed through the physical insertion effect, and the water passing and ventilation functions of the water inlet holes are rapidly recovered; the rice root system is always in an aerobic environment, the root rotting phenomenon is effectively reduced, and the seedling survival rate is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of rice seedling raising devices, and particularly relates to a cadmium-reducing rice seedling raising device. Background Technology

[0002] During its growth, rice is affected by human pollutants and, due to its root-like growth characteristics, cadmium in the soil is easily absorbed by rice and accumulates in the plant and grains. When humans eat rice containing cadmium, cadmium accumulates in organs such as the kidneys and bones, causing kidney damage, osteoporosis, skeletal deformities, and may also affect the reproductive and immune systems.

[0003] To reduce the cadmium content in rice, a synergistic effect is achieved through three core mechanisms during rice cultivation: the application of selenium fertilizer, physiological antagonism, chemical complexation, and metabolic regulation. This ultimately achieves the dual goals of reducing cadmium content and increasing selenium content in rice seedlings (and subsequent plants).

[0004] During the rice seedling cultivation process, the existing seedling trays only have a simple planting function. As the rice grows, the air vents at the bottom of the seedling tray are easily blocked by the rice roots and the growing medium, which causes the rice roots to lack oxygen and rot, thus affecting the normal cultivation of rice.

[0005] Therefore, it is necessary to invent a cadmium-reducing rice seedling raising device to solve the above problems. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a cadmium-reducing rice seedling raising device to solve the issues raised in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A cadmium-reducing rice seedling raising device, comprising:

[0009] A seedling tray, wherein several seedling cells are evenly distributed on the inner side of the seedling tray;

[0010] The base plate is detachably connected to the bottom of the seedling tray, and several water inlet holes are evenly provided at the position where the base plate is directly opposite the seedling grid.

[0011] The unblocking device includes a base, insert rods, and a liquid-pressing assembly. The base is horizontally positioned at the bottom of the base plate, and several support components are symmetrically arranged between the top edge of the base and the base plate. There are multiple insert rods, which are vertically fixed to the top of the base, and each insert rod is directly opposite a multiple water inlet hole at the bottom of the base plate. The liquid-pressing assembly is located inside the seedling tray and is used to press clean water from the outside into the seedling tray when the seedling tray moves downward.

[0012] Furthermore, the support assembly includes a limiting rod, a support spring, a fixing block, and a nut. The limiting rod is vertically fixed to the side of the base. The support spring is detachably sleeved on the limiting rod. The fixing block is slidably sleeved on the limiting rod. The fixing block is located at the top of the support spring and is fixedly connected to the side of the base plate. The nut is threaded onto the top of the limiting rod to restrict the fixing block on the limiting rod.

[0013] Furthermore, the liquid-pressing assembly includes a guide tube, elastic plates, a top rod, and a sealing mechanism. The guide tube is detachably and vertically inserted into the base plate, and is vertically located at the center of the seedling tray. There are multiple elastic plates, which are evenly distributed in a ring at the top of the guide tube. The bottom end of each elastic plate is fixedly connected to the top of the guide tube, and the top ends of the multiple elastic plates are fixedly connected together. The middle part of each elastic plate protrudes away from the axis of the guide tube, and the edges of two adjacent elastic plates are abutted together. The top rod is vertically located at the bottom of the guide tube and is vertically fixedly connected to the top of the base. The sealing mechanism is connected to the top of the top rod and is used to push the external water upward in conjunction with the guide tube when the seedling tray moves downward.

[0014] Furthermore, the sealing mechanism includes a movable rod, a rubber plug, and a sealing gasket. The movable rod is vertically slidably inserted into the top of the top rod, and the movable rod is hollow. The buoyancy generated by the movable rod is greater than the sum of the weight of the movable rod and the rubber plug. The rubber plug is horizontally fixedly connected to the top of the movable rod, and the diameter of the rubber plug matches the inner diameter of the guide tube. Several pressure relief holes are opened through the top of the rubber plug and the sealing gasket near the edge, and the pressure relief holes on the rubber plug and the sealing gasket are kept misaligned. The sealing gasket is fixedly sleeved on the top of the top rod, and the diameter of the sealing gasket is the same as the diameter of the rubber plug.

[0015] Furthermore, the base is hollow, and several through holes are evenly distributed on the top of the base. Pressing components are symmetrically arranged on both sides of the base. Each pressing component includes a mounting plate, an airbag, connecting pipes, an air intake mechanism, and a pressing mechanism. The mounting plate is horizontally fixed to the side of the base. The airbag is fixedly connected to the top of the mounting plate and is retractable. Multiple connecting pipes connect the airbag to the internal cavity of the base, and a first one-way valve is installed on each connecting pipe. This first one-way valve only allows gas to enter the cavity of the base from the airbag. The air intake mechanism is connected to the airbag to allow outside air to enter the airbag. The pressing mechanism is connected to the side of the base plate to compress the airbag when the base plate moves downwards.

[0016] Furthermore, the air intake mechanism includes an air intake pipe, a second one-way valve, and a floating air intake head. The air intake pipe is connected to the side of the airbag away from the connecting pipe and communicates with the inside of the airbag. The second one-way valve is installed near the top of the air intake pipe and only allows outside air to enter the airbag through the top of the air intake pipe. The floating air intake head is connected to the top of the air intake pipe, and the buoyancy generated by the floating air intake head is greater than the weight of the air intake pipe and the second one-way valve.

[0017] Furthermore, the pressing mechanism includes an L-shaped connecting plate and a strip-shaped pressure plate. The strip-shaped pressure plate is horizontally disposed on the top of the airbag, and the area of ​​the strip-shaped pressure plate is the same as the top area of ​​the airbag. The connecting plate is fixedly connected between the top of the strip-shaped pressure plate and the side of the bottom plate.

[0018] Furthermore, the bottom edge of the base plate protrudes downwards evenly to form a retaining ring, and the bottom of the retaining ring is lower than the bottom end of the guide tube.

[0019] Furthermore, a U-shaped handle is fixedly connected to the top position of both the front and rear sides of the base plate. The handle is attached to the seedling tray, and the top of the handle is lower than the top of the seedling tray.

[0020] Furthermore, in the initial state, the rubber plug is located outside the guide tube, and at this time the top of the insertion rod remains separated from the bottom of the base plate.

[0021] The technical effects and advantages of this invention are as follows:

[0022] 1. This invention is equipped with a clearing device. When the rice roots or culture medium in the seedling tray block the water inlet hole of the bottom plate, the staff can press down on the seedling tray. At this time, the insertion rod will be precisely inserted into the corresponding water inlet hole. Through physical penetration, the blockage is cleared, the water inlet hole is quickly restored to its water flow and aeration function, ensuring that the rice roots are always in an aerobic environment, effectively reducing root rot and improving the seedling survival rate.

[0023] 2. This invention incorporates a liquid-pressing component. When the seedling tray is pressed downwards, the sealing gasket and rubber stopper work together with the guide tube to push the water flow upwards. This allows the water in the guide tube to enter the area inside multiple elastic sheets. At this time, under the squeezing action of the sealed space, the water in the guide tube opens the gap between two adjacent elastic sheets and evenly enters the substrate in the seedling cell. This accelerates the flow rate of water in the substrate in the seedling cell, allowing more dissolved oxygen in the water to enter the substrate, increasing the oxygen content of the substrate, and reducing the probability of rice roots rotting due to lack of oxygen. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a three-dimensional bottom view of the seedling tray and base plate in this invention;

[0026] Figure 3 This is a three-dimensional schematic diagram of the base plate, strip pressure plate, and hydraulic assembly in this invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of the base and pressing components in this invention;

[0028] Figure 5 In this invention Figure 4 Enlarged view of part A;

[0029] Figure 6 This is a three-dimensional schematic diagram of the pressing component in this invention;

[0030] Figure 7 This is a three-dimensional schematic diagram of the structure of the guide tube, push rod, and elastic sheet in this invention.

[0031] In the diagram: 1. Seedling tray; 2. Seedling grid; 3. Base plate; 4. Water inlet hole; 5. Base; 6. Insert rod; 7. Limiting rod; 8. Support spring; 9. Fixing block; 10. Nut; 11. Guide pipe; 12. Elastic sheet; 13. Top rod; 14. Movable rod; 15. Rubber plug; 16. Sealing gasket; 17. Pressure relief hole; 18. Through hole; 19. Mounting plate; 20. Airbag; 21. Connecting pipe; 22. First one-way valve; 23. Air inlet pipe; 24. Second one-way valve; 25. Floating air inlet head; 26. Connecting plate; 27. Strip pressure plate; 28. Retaining ring; 29. ​​Handle. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] This invention provides, for example Figures 1 to 7 The cadmium-reducing rice seedling raising device shown includes: a seedling tray 1, a base plate 3, and a dredging device. Several seedling grids 2 are evenly distributed on the inner side of the seedling tray 1.

[0034] The base plate 3 is detachably connected to the bottom of the seedling tray 1, and several water inlet holes 4 are evenly provided at the position where the base plate 3 and the seedling grid 2 are directly opposite each other; the unblocking device includes a base 5, a rod 6 and a liquid pressing component. The base 5 is horizontally set at the bottom of the base plate 3, and several support components are symmetrically arranged between the top edge of the base 5 and the base plate 3. There are multiple rods 6, which are vertically fixed to the top of the base 5, and the multiple rods 6 are directly opposite the multiple water inlet holes 4 at the bottom of the base plate 3. The liquid pressing component is set in the seedling grid 2 and is used to press clean water from the outside into the seedling grid 2 when the seedling tray 1 moves downward.

[0035] The support assembly includes a limiting rod 7, a support spring 8, a fixing block 9, and a nut 10. The limiting rod 7 is vertically fixed to the side of the base 5. The support spring 8 is detachably sleeved on the limiting rod 7. The fixing block 9 is slidably sleeved on the limiting rod 7. The fixing block 9 is located on top of the support spring 8 and is fixedly connected to the side of the base plate 3. The nut 10 is threaded onto the top of the limiting rod 7 to restrict the fixing block 9 on the limiting rod 7.

[0036] When cultivating rice, first fill a layer of substrate evenly in the seedling grid 2, then evenly scatter the rice seeds on the substrate in the seedling grid 2, and then cover them with soil again so that the seeds can be covered by the substrate. Then, place the seedling tray 1 with the seeds in the water trough and pour clean water into the water trough so that the clean water can submerge the bottom of the substrate, so that the substrate can always be kept moist, thus providing conditions for the germination and rooting of the seeds.

[0037] During the germination and growth of rice, selenium fertilizer is applied to the rice regularly to reduce the cadmium content in the rice. After the rice seeds germinate and grow roots, the water level in the water tank can be raised so that the water in the water tank just submerges the substrate, thereby ensuring the normal water needs of the rice seeds.

[0038] When the water inlet hole 4 on the base plate 3 is blocked by the rice seed roots and substrate, the seedling tray 1 can be pressed down, so that the seedling tray 1 drives the base plate 3 to move downward under the restriction of the limiting rod 7. During this process, the support spring 8 can be gradually compressed by the fixing block 9, and the insertion rod 6 on the base 5 can be gradually inserted into the bottom of the substrate through the water inlet hole 4, so as to leave insertion holes evenly at the bottom of the substrate, thereby increasing the contact area between the substrate and dissolved oxygen in the water.

[0039] After the blockage is cleared, the seedling tray 1 is released. The support spring 8 pushes the fixing block 9 upward under the action of elastic potential energy, which drives the base plate 3 and the seedling tray 1 to reset. The insertion rod 6 separates from the water inlet hole 4, avoiding continuous damage to the root system. This active unblocking method does not require disassembly of the device, is easy to operate, and can quickly restore the water flow and air permeability of the water inlet hole 4, ensuring that the rice roots are always in an aerobic environment, effectively reducing root rot and improving the seedling survival rate.

[0040] In addition, since the base 5, the bottom plate 3 and the seedling tray 1 can all be easily disassembled, after the seedlings are grown, the base 5, the bottom plate 3 and the seedling tray 1 can be disassembled for thorough cleaning, thereby avoiding the presence of pathogens in the bottom plate 3 and the seedling tray 1.

[0041] like Figures 1 to 7As shown, the liquid-pressing assembly includes a guide pipe 11, elastic plates 12, a top rod 13, and a sealing mechanism. The guide pipe 11 is detachably and vertically inserted into the base plate 3, and the guide pipe 11 is vertically located at the center of the seedling tray 2. There are multiple elastic plates 12, which are evenly distributed in a ring at the top of the guide pipe 11. The bottom end of the elastic plate 12 is fixedly connected to the top end of the guide pipe 11. The top ends of multiple elastic plates 12 are fixedly connected together. The middle part of the elastic plate 12 protrudes away from the axis of the guide pipe 11, and the edges of two adjacent elastic plates 12 are attached together. The top rod 13 is vertically located at the bottom of the guide pipe 11, and the top rod 13 is vertically fixedly connected to the top of the base 5. The sealing mechanism is connected to the top end of the top rod 13 and is used to push the external clean water upward with the guide pipe 11 when the seedling tray 1 moves downward.

[0042] The sealing mechanism includes a movable rod 14, a rubber plug 15, and a sealing gasket 16. The movable rod 14 is vertically slidably inserted into the top of the top rod 13, and the movable rod 14 is hollow. The buoyancy generated by the movable rod 14 is greater than the sum of the weight of the movable rod 14 and the rubber plug 15. The rubber plug 15 is horizontally fixedly connected to the top of the movable rod 14, and the diameter of the rubber plug 15 matches the inner diameter of the guide tube 11. Several pressure relief holes 17 are opened through the top of the rubber plug 15 and the sealing gasket 16 near the edge, and the pressure relief holes 17 on the rubber plug 15 and the sealing gasket 16 are kept misaligned. The sealing gasket 16 is fixedly sleeved on the top of the top rod 13, and the diameter of the sealing gasket 16 is the same as the diameter of the rubber plug 15. In the initial state, the rubber plug 15 is located outside the guide tube 11, and at this time the top of the insertion rod 6 is separated from the bottom of the base plate 3.

[0043] With the liquid-pressing assembly, when the seedling tray 1 is pressed down, the base plate 3 moves downward along with it. During this process, when the bottom end of the guide tube 11 contacts the rubber stopper 15, the rubber stopper 15 moves downward along with the movable rod 14 under the squeezing action of the guide tube 11. When the rubber stopper 15 contacts the sealing gasket 16, the sealing gasket 16 and the rubber stopper 15 cooperate to seal their respective pressure relief holes 17. At this time, as the base plate 3 continues to move downward, the rubber stopper 15 is inserted into the guide tube 11 under the pushing action of the push rod 13. Plate 3 continues to drive the guide tube 11 downward, and rubber plug 15 can cooperate with the guide tube 11 to push the water flow in the guide tube 11 upward, so that the clear water in the guide tube 11 can enter the area where multiple elastic plates 12 are located. At this time, under the squeezing action of the sealed space, the clear water in the guide tube 11 pushes open the gap between two adjacent elastic plates 12 and enters the substrate in the seedling grid 2 evenly, thereby accelerating the flow rate of water in the substrate in the seedling grid 2, so that more dissolved oxygen in the water can enter the substrate, increase the oxygen content of the substrate, and reduce the chance of rice roots rotting due to lack of oxygen.

[0044] Subsequently, as the seedling tray 1 is released, it can return to its original position under the action of the supporting spring 8. During this process, the rubber plug 15 can first be stuck to the inner wall of the guide tube 11 due to friction, while the sealing gasket 16 can move downward relative to the rubber plug 15 under the restriction of the top rod 13, thereby separating the rubber plug 15 from the sealing gasket 16. As the rubber plug 15 and the sealing gasket 16 separate, the pressure relief holes 17 on both the rubber plug 15 and the sealing gasket 16 can be opened. At this time, the water outside the guide tube 11 can enter the area surrounded by multiple elastic plates 12 through the pressure relief holes 17 on the sealing gasket 16 and the rubber plug 15, thereby balancing the pressure difference inside and outside the guide tube 11. Since the sealing gasket 16 and the rubber plug 15 no longer exert downward suction on the water in the guide tube 11, the water in the substrate of the seedling grid 2 will not enter the gap between two adjacent elastic plates 12 under the action of suction, thus avoiding the blockage of the gap between two adjacent elastic plates 12 by the substrate.

[0045] like Figures 1 to 6 As shown, the base 5 is hollow, and several through holes 18 are evenly opened on the top of the base 5. Pressing components are symmetrically arranged on both sides of the base 5. The pressing components include a mounting plate 19, an airbag 20, a connecting pipe 21, an air intake mechanism, and a pressing mechanism. The mounting plate 19 is horizontally fixed to the side of the base 5. The airbag 20 is fixedly connected to the top of the mounting plate 19 and can extend and retract. There are multiple connecting pipes 21, which are connected between the airbag 20 and the internal cavity of the base 5. A first one-way valve 22 is installed on the connecting pipe 21. The first one-way valve 22 only allows gas to enter the cavity of the base 5 from the airbag 20. The air intake mechanism is connected to the airbag 20 and is used to introduce outside air into the airbag 20. The pressing mechanism is connected to the side of the base plate 3 and is used to squeeze the airbag 20 when the base plate 3 moves downward.

[0046] The air intake mechanism includes an air intake pipe 23, a second one-way valve 24, and a floating air intake head 25. The air intake pipe 23 is connected to the side of the airbag 20 away from the connecting pipe 21, and the air intake pipe 23 communicates with the inside of the airbag 20. The second one-way valve 24 is installed near the top of the air intake pipe 23, and the second one-way valve 24 only allows outside air to enter the airbag 20 through the top of the air intake pipe 23. The floating air intake head 25 is connected to the top of the air intake pipe 23, and the buoyancy generated by the floating air intake head 25 is greater than the weight of the air intake pipe 23 and the second one-way valve 24.

[0047] The pressing mechanism includes an L-shaped connecting plate 26 and a strip-shaped pressure plate 27. The strip-shaped pressure plate 27 is horizontally arranged on the top of the airbag 20, and the area of ​​the strip-shaped pressure plate 27 is the same as the top area of ​​the airbag 20. The connecting plate 26 is fixedly connected between the top of the strip-shaped pressure plate 27 and the side of the bottom plate 3.

[0048] With the addition of a pressing component, the floating air inlet 25 floats on the water surface during rice seedling cultivation, ensuring its top is not submerged. As the seedling tray 1 is pressed down, the strip-shaped pressure plate 27, driven by the base plate 3, compresses the air bladder 20. As the air bladder 20 is compressed, the air inside it pushes open the first one-way valve 22 on the connecting pipe 21 and enters the base 5. Simultaneously, the air entering the base 5 then floats evenly upwards through the through-hole 18 at the top of the base 5 under buoyancy. At this point, because the insertion rod 6 is inserted into the air inlet... In the water hole 4, air temporarily gathers at the bottom of the base plate 3. As the seedling tray 1 is released, the seedling tray 1 can return to its original position under the action of the support spring 8. As the base plate 3 drives the strip pressure plate 27 to move upward, the pressure of the strip pressure plate 27 on the air bag 20 gradually decreases. At this time, the air bag 20 can expand under its own elastic force. During this process, the first one-way valve 22 is in the closed state, thereby preventing water in the base 5 from being sucked into the air bag 20. The second one-way valve 24 is in the open state under the action of atmospheric pressure, thereby ensuring that outside air can enter the air bag 20, which facilitates the restoration of the air bag 20.

[0049] As the insertion rod 6 is pulled out from the water inlet hole 4, the bottom of the substrate in the seedling grid 2 can be evenly perforated by the insertion rod 6. At this time, the air gathered at the bottom of the base plate 3 can enter the holes at the bottom of the substrate under the action of buoyancy, and thus be evenly absorbed by the rice roots, increasing the oxygen content of the rice roots and preventing the rice roots from rotting due to lack of oxygen.

[0050] like Figure 2 As shown, the bottom edge of the base plate 3 protrudes downwards evenly to form a retaining ring 28, and the bottom of the retaining ring 28 is lower than the bottom end of the guide tube 11.

[0051] By setting up the retaining ring 28, the retaining ring 28 can, on the one hand, protect the bottom end of the guide pipe 11 when the base plate 3 is placed on the ground, preventing the bottom end of the guide pipe 11 from being deformed or damaged due to impact. On the other hand, when the airbag 20 discharges air upward through the through hole 18 at the top of the base 5, the discharged air can be restricted by the retaining ring 28 and gather at the bottom of the base plate 3. Subsequently, the gathered air can be gradually passed through the water inlet hole 4 on the base plate 3 under the action of buoyancy and absorbed by the rice roots, thereby increasing the oxygen content of the rice roots during the cultivation process and preventing root rot.

[0052] like Figures 1 to 3 As shown, U-shaped handles 29 are fixedly connected to the top of the front and rear sides of the base plate 3. The handles 29 are attached to the seedling tray 1, and the top of the handles 29 is lower than the top of the seedling tray 1.

[0053] By providing a handle 29, the ease of moving the seedling tray 1 is improved.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A cadmium-reducing rice seedling raising device, characterized in that, include: Seedling tray (1), wherein several seedling grids (2) are evenly distributed on the inner side of the seedling tray (1); The bottom plate (3) is detachably connected to the bottom of the seedling tray (1), and several water inlet holes (4) are evenly provided at the position where the bottom plate (3) is directly opposite the seedling grid (2). The unblocking device includes a base (5), a rod (6), and a liquid-pressing assembly. The base (5) is horizontally set at the bottom of the base plate (3), and several support components are symmetrically arranged between the top edge of the base (5) and the base plate (3). There are multiple rods (6), which are vertically fixed to the top of the base (5). The multiple rods (6) are directly opposite to the multiple water inlets (4) at the bottom of the base plate (3). The liquid-pressing assembly is set inside the seedling tray (2) and is used to press clean water from the outside into the seedling tray (2) when the seedling tray (1) moves downward.

2. The cadmium-reducing rice seedling raising device according to claim 1, characterized in that: The support assembly includes a limiting rod (7), a support spring (8), a fixing block (9), and a nut (10). The limiting rod (7) is vertically fixed to the side of the base (5). The support spring (8) is detachably sleeved on the limiting rod (7). The fixing block (9) is slidably sleeved on the limiting rod (7). The fixing block (9) is located at the top of the support spring (8) and is fixedly connected to the side of the base plate (3). The nut (10) is threaded onto the top of the limiting rod (7) to restrict the fixing block (9) on the limiting rod (7).

3. The cadmium-reducing rice seedling raising device according to claim 2, characterized in that: The liquid-pressing assembly includes a guide tube (11), elastic plates (12), a top rod (13), and a sealing mechanism. The guide tube (11) is detachably and vertically inserted into the base plate (3), and the guide tube (11) is vertically located at the center of the seedling grid (2). There are multiple elastic plates (12), which are evenly distributed in a ring at the top of the guide tube (11). The bottom end of the elastic plate (12) is fixedly connected to the top end of the guide tube (11). The top ends of the elastic sheet (12) are fixedly connected together. The middle part of the elastic sheet (12) protrudes away from the axis of the guide tube (11), and the edges of two adjacent elastic sheets (12) are attached together. The top rod (13) is vertically located at the bottom of the guide tube (11), and the top rod (13) is vertically fixedly connected to the top of the base (5). The sealing mechanism is connected to the top of the top rod (13) and is used to push the outside water upward with the guide tube (11) when the seedling tray (1) moves downward.

4. The cadmium-reducing rice seedling raising device according to claim 3, characterized in that: The sealing mechanism includes a movable rod (14), a rubber plug (15), and a sealing gasket (16). The movable rod (14) is vertically slidably inserted into the top of the top rod (13), and the movable rod (14) is hollow. The buoyancy generated by the movable rod (14) is greater than the sum of the weights of the movable rod (14) and the rubber plug (15). The rubber plug (15) is horizontally fixedly connected to the top of the movable rod (14), and the diameter of the rubber plug (15) matches the inner diameter of the guide tube (11). Several pressure relief holes (17) are opened through the top of the rubber plug (15) and the sealing gasket (16) near the edge, and the pressure relief holes (17) on the rubber plug (15) and the sealing gasket (16) are kept misaligned. The sealing gasket (16) is fixedly sleeved on the top of the top rod (13), and the diameter of the sealing gasket (16) is the same as the diameter of the rubber plug (15).

5. The cadmium-reducing rice seedling raising device according to claim 4, characterized in that: The base (5) is hollow, and several through holes (18) are evenly provided on the top of the base (5). Pressing components are symmetrically arranged on both sides of the base (5). The pressing components include a mounting plate (19), an airbag (20), a connecting tube (21), an air intake mechanism, and a pressing mechanism. The mounting plate (19) is horizontally fixed to the side of the base (5). The airbag (20) is fixedly connected to the top of the mounting plate (19), and the airbag (20) is retractable. The number of connecting tubes (21) is... There are multiple connecting pipes (21) connected between the airbag (20) and the internal cavity of the base (5), and a first one-way valve (22) is installed on the connecting pipe (21). The first one-way valve (22) only allows gas to enter the cavity of the base (5) from the airbag (20). The air intake mechanism is connected to the airbag (20) and is used to introduce outside air into the airbag (20). The pressing mechanism is connected to the side of the base plate (3) and is used to squeeze the airbag (20) when the base plate (3) moves downward.

6. The cadmium-reducing rice seedling raising device according to claim 5, characterized in that: The air intake mechanism includes an air intake pipe (23), a second one-way valve (24), and a floating air intake head (25). The air intake pipe (23) is connected to the side of the airbag (20) away from the connecting pipe (21), and the air intake pipe (23) is connected to the inside of the airbag (20). The second one-way valve (24) is installed near the top of the air intake pipe (23), and the second one-way valve (24) only allows outside air to enter the airbag (20) through the top of the air intake pipe (23). The floating air intake head (25) is connected to the top of the air intake pipe (23), and the buoyancy generated by the floating air intake head (25) is greater than the weight of the air intake pipe (23) and the second one-way valve (24).

7. The cadmium-reducing rice seedling raising device according to claim 6, characterized in that: The pressing mechanism includes an L-shaped connecting plate (26) and a strip-shaped pressure plate (27). The strip-shaped pressure plate (27) is horizontally positioned on the top of the airbag (20), and the area of ​​the strip-shaped pressure plate (27) is the same as the top area of ​​the airbag (20). The connecting plate (26) is fixedly connected between the top of the strip-shaped pressure plate (27) and the side of the bottom plate (3).

8. The cadmium-reducing rice seedling raising device according to claim 7, characterized in that: The bottom edge of the base plate (3) protrudes downwards evenly to form a retaining ring (28), and the bottom of the retaining ring (28) is lower than the bottom of the guide pipe (11).

9. The cadmium-reducing rice seedling raising device according to claim 8, characterized in that: The top of the front and rear sides of the base plate (3) is fixedly connected with a U-shaped handle (29). The handle (29) is attached to the seedling tray (1), and the top of the handle (29) is lower than the top of the seedling tray (1).

10. The cadmium-reducing rice seedling raising device according to claim 9, characterized in that: In the initial state, the rubber plug (15) is located outside the guide tube (11), and at this time the top of the insert (6) is separated from the bottom of the base plate (3).

Images