A soilless rice seedling raising tray for rice planting

Abstract

The application belongs to the technical field of seeding container equipment, and particularly relates to a bottom-soil-free rice seedling raising tray for rice planting, which comprises a substrate soft disc and a seedling raising tray body for storing the substrate soft disc; further comprises an aerial oxygen permeation mechanism, which is installed between the seedling raising tray body and the substrate soft disc, and reduces the hypoxia probability of seedlings on the substrate soft disc in an aerial manner; the aerial oxygen permeation mechanism is controlled by a control member to control the periodic forward and reverse rotation of the perforated plate in the seedling raising tray body in the daytime when the temperature rises, so that the substrate soft disc is periodically changed in the water supplementing and air permeation links, and the water permeation holes in the seedling raising tray body are arranged, which not only can conveniently supplement the water of the rice seedlings for a small number of times, but also can reduce the hypoxia probability of the rice seedling roots by the water control and air permeation mode, and provide better assistance for the growth of the rice seedlings.

Description

Technical Field

[0001] This invention belongs to the technical field of sowing container equipment, specifically a bottomless rice seedling tray for rice cultivation. Background Technology

[0002] Soilless rice seedling raising is a seedling raising technology that uses a substrate instead of soil. Since soilless seedling raising often uses agricultural and forestry waste (such as straw and rice husks) as a substrate, it has advantages such as protecting arable land and improving seedling quality, and therefore it is gradually being promoted in the field of rice seedling raising.

[0003] In soilless rice seedling raising, a combination of substrate and seedling trays is often used, employing blanket-like or block-like seedling raising methods to achieve large-scale rice seedling raising. During the seedling raising process, techniques such as nutrient solution spraying and temperature control are employed to precisely regulate the growth environment of rice seedlings, ensuring robust seedlings, well-developed root systems, and the formation of blankets (blocks). This not only effectively improves the emergence rate and promotes well-developed root systems but also facilitates subsequent mechanized seedling lifting and transplanting operations. For example, the pot-blanket hybrid rice seedling raising tray disclosed in related technologies, application number CN2016102503841, features uniformly arranged transverse and longitudinal straight partitions on the bottom of the tray. The transverse and longitudinal straight partitions intersect, forming holes at the intersections. Both the transverse and longitudinal straight partitions are straight, and the top and bottom of the holes formed between the straight partitions are similar in size, ensuring a large space at the bottom of the holes, which is more conducive to the development of hybrid rice roots and increases hybrid rice yield.

[0004] However, the growth requirements of rice seedlings vary depending on the environment during their growth. They have different needs for water, oxygen, and space. For example, rice seedlings have high water requirements during the day due to vigorous photosynthesis and transpiration. Also, new white roots grow rapidly during the day, requiring sufficient space for root development. At night, however, seedlings only respire, with stomata partially closed and transpiration decreasing sharply, necessitating a low-water, high-oxygen environment. In the above scheme, since the seedling tray only drains and ventilates through the bottom drainage holes, the ability to adjust water and oxygen levels according to the actual needs of the rice seedlings is weak, resulting in a weaker promoting effect on rice seedling growth.

[0005] In view of this, the present invention proposes a bottomless rice seedling tray for rice cultivation to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the above-mentioned technical problems, this invention proposes a bottomless rice seedling tray for rice cultivation.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a bottomless rice seedling tray for rice planting, comprising a substrate tray and a seedling tray body for storing the substrate tray;

[0008] It also includes an overhead oxygen permeation mechanism, which is installed between the seedling tray and the substrate tray. The overhead oxygen permeation mechanism reduces the probability of oxygen deficiency in the seedlings on the substrate tray by means of overhead means.

[0009] The overhead oxygen permeation mechanism includes:

[0010] A perforated plate is installed in a seedling tray, and the substrate trays are evenly arranged on the perforated plate. A rotating shaft is fixedly installed in the middle of the perforated plate, and the perforated plate is installed in the seedling tray by rotating through the rotating shaft.

[0011] Support bases are installed inside the seedling tray. The support bases are located at both ends of the bottom of the hollow plate. In the initial state, the support bases cooperate with the rotating shaft to support the hollow plate. All support bases are lifting rods.

[0012] A control component is installed on the outside of the seedling tray and is used to control the periodic raising and lowering of the support base.

[0013] Preferably, the control component includes a knob, a spring, a control lever, and a telescopic cylinder;

[0014] The seedling tray is provided with a rotating groove and a straight sliding groove. A knob and a spring are rotatably installed in the rotating groove. The two ends of the spring are fixedly connected to the knob and the seedling tray, respectively.

[0015] The control rod is slidably installed in a linear slide groove, which is connected to a rotating groove. The control rod is a C-shaped structure that extends into the rotating groove. During the rotation of the knob, the two ends of the control rod are alternately pushed to move.

[0016] Telescopic cylinders are fixedly installed at both ends of the linear slide rail. The telescopic cylinders are located on the reciprocating sliding path of the control rod, and the telescopic cylinders are respectively connected to the two support seats through pipes.

[0017] Preferably, the seedling tray has a slot, which is coaxially distributed with the rotating groove. The knob extends into the slot, and a push-out spring is fixedly installed inside the slot. In the initial state, the control lever is located on the rotation path of the knob under the support of the push-out spring.

[0018] Preferably, each of the telescopic cylinders has a flow-limiting rod threadedly installed at its output end. One end of the flow-limiting rod extends into the inside of the telescopic cylinder's output end, and the other end extends into the outside of the seedling tray. An adjustment cap is fixedly installed on the end of the flow-limiting rod located on the outside of the seedling tray.

[0019] Preferably, it also includes an anti-blocking separation mechanism, which is installed on the perforated plate and is used to prevent the roots of rice seedlings from blocking the holes in the perforated plate;

[0020] The anti-blocking separation mechanism includes a lifting rod, a connecting plate, and a support spring;

[0021] The lifting rods are all fixedly installed on the connecting plate. The lifting rods extend through the holes in the perforated plate to the bottom of the substrate floppy disk. The lifting rods are used to lift the substrate floppy disk. The perforated plate and the connecting plate are elastically connected by a support spring.

[0022] Preferably, all lifting rods are spring telescopic rods, and the end of the lifting rod away from the connecting plate is T-shaped and made of elastic rubber material.

[0023] Preferably, the seedling tray has an arc block installed inside, and the arc block has evenly distributed protrusions. The protrusions are all made of elastic material and are located on the rotation path of the hollow plate.

[0024] Preferably, guide plates are fixedly installed on both sides of the hollow plate, and guide grooves are provided on the guide plates. Pressure rollers are slidably installed on the guide plates through the guide grooves.

[0025] Preferably, the guide groove is C-shaped with the opening facing upwards, and the diameter of the end of the pressure roller located inside the guide groove is smaller than the height of the guide groove.

[0026] Preferably, the guide plate has a sliding groove below the hollow plate, and the connecting plate extends into the sliding groove. The sliding groove is used to control the connecting plate to remain parallel to the hollow plate.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The rice seedling tray without soil for rice cultivation described in this invention, by setting up an elevated oxygen-permeable mechanism, allows the perforated plate to rotate periodically in both directions within the seedling tray during the day when the temperature rises. This causes the substrate tray to periodically change between water replenishment and aeration. Combined with the water-permeable holes in the seedling tray, this not only allows for convenient and frequent small-volume water replenishment for rice seedlings, but also reduces the probability of root hypoxia by controlling water and aeration, thus providing better support for the growth of rice seedlings.

[0029] 2. The bottomless rice seedling tray for rice cultivation described in this invention utilizes the intermittent interception of the connecting plate by the protrusions, allowing the lifting rod to repeatedly lift the seedling roots or substrate tray. The lifting rod, made with a spring telescopic rod, can use multiple elastic impacts to promote the separation of the seedling roots from the perforated plate. At the same time, the multiple elastic impacts can reduce the probability of seedling root breakage compared to direct lifting. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is an overall schematic diagram of the present invention;

[0032] Figure 2 This is a three-dimensional view of the assembly of the seedling tray and the overhead oxygen permeation mechanism in this invention;

[0033] Figure 3 It is a 3D diagram of the substrate floppy disk;

[0034] Figure 4 This is a diagram of the internal structure of the seedling tray;

[0035] Figure 5 This is a cross-sectional view of the seedling tray at the rotating trough and the straight sliding trough;

[0036] Figure 6 It is a 3D view of the control components;

[0037] Figure 7 It is a 3D assembly diagram of the perforated plate, guide plate, and lifting rod;

[0038] Figure 8 It is a 3D assembly view of the connecting plate and the lifting rod;

[0039] Figure 9 It is a 3D diagram of the arc block;

[0040] In the diagram: 1. Substrate tray; 2. Seedling tray body; 21. Perforated plate; 22. Rotating shaft; 23. Support base; 24. Knob; 25. Rotating groove; 26. Spring; 3. Control lever; 31. Linear chute; 32. Telescopic cylinder; 33. Slot; 34. Push-out spring; 35. Flow limiting rod; 36. Adjusting cap; 4. Lifting rod; 41. Connecting plate; 42. Support spring; 43. Arc block; 44. Protrusion; 5. Guide plate; 51. Guide chute; 52. Pressure roller; 53. Sliding groove. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0042] like Figures 1 to 9As shown, the rice seedling tray without soil for rice cultivation according to the present invention includes a substrate tray 1 and a seedling tray body 2 for storing the substrate tray 1.

[0043] It also includes an overhead oxygen permeation mechanism, which is installed between the seedling tray 2 and the substrate tray 1. The overhead oxygen permeation mechanism reduces the probability of oxygen deficiency in the seedlings on the substrate tray 1 by means of overhead means.

[0044] The overhead oxygen permeation mechanism includes:

[0045] A perforated plate 21 is installed in the seedling tray 2. The substrate soft tray 1 is evenly arranged on the perforated plate 21. A rotating shaft 22 is fixedly installed in the middle of the perforated plate 21. The perforated plate 21 is rotatably installed in the seedling tray 2 through the rotating shaft 22.

[0046] Support base 23: The seedling tray 2 is equipped with support base 23. The support base 23 is located at both ends of the bottom of the hollow plate 21. In the initial state, the support base 23 cooperates with the rotating shaft 22 to support the hollow plate 21. The support base 23 is a lifting rod.

[0047] The control component is installed on the outside of the seedling tray 2 and is used to control the support base 23 to periodically rise and fall.

[0048] During rice seedling cultivation, rice seedlings are greatly affected by environmental factors. When the seedling cultivation environment is in a high temperature and high humidity state, the roots of rice seedlings will suffer irreversible damage in a short period of time due to oxygen deficiency, especially the more fragile newly grown white roots. In the later stages of rice seedling cultivation, the root system is more developed and the plant density is higher. In addition, the small space of the seedling tray makes it easy for the bottom of the rice seedlings in the middle of the seedling tray to become oxygen-deficient without turning them over. Therefore, this invention sets up an elevated oxygen-permeable mechanism to promote air circulation during the rice seedling cultivation process and reduce the probability of oxygen deficiency in rice seedlings.

[0049] Specifically, during the seedling raising process, rice seeds are sown in a substrate tray 1, which is then placed side-by-side on a perforated plate 21 inside the seedling tray body 2. In this invention, the perforated plate 21 is a straight plate-shaped structure with densely pored surfaces and vertically connected. The perforated plate 21 is rotatably connected to the seedling tray body 2 via a central pivot 22. The support base 23 installed at the bottom of the seedling tray body 2 supports both ends of the perforated plate 21. Due to the presence of the perforated plate 21, a gap exists between the substrate tray 1 and the bottom of the seedling tray body 2. Furthermore, in this invention, the side wall of the seedling tray body 2 has permeable holes, the height of which is close to the height of the pivot 22. Therefore, the seedling tray body 2 can retain a certain depth of nutrient solution, and the nutrient solution level is close to the bottom of the substrate tray 1. There are certain gaps, allowing air to circulate through the gap between the perforated plate 21 and the nutrient solution. After the rice seedlings germinate and emerge in the substrate tray 1, as time progresses, their roots penetrate the substrate tray 1 and form a root system below it. At this time, due to the growth of the seedlings, the substrate tray 1 becomes filled, significantly reducing its permeability. Simultaneously, during the day, due to the increased temperature, the seedlings' photosynthesis and transpiration increase, leading to a higher water demand. At this point, the operator uses a control unit to periodically raise and lower the two support seats 23. The perforated plate 21 is supported at both ends by the support seats 23. Therefore, when the support seats 23 at both ends of the perforated plate 21 move up and down (the two support seats 23...), the perforated plate 21... The support 23 moves in the opposite direction, rising and falling alternately. Supported by the central pivot 22, the perforated plate 21 tilts. As the tilt angle of the perforated plate 21 increases, one end of the perforated plate 21 and the substrate tray 1 on it descends and is submerged in water, while the other end rises and is exposed to the outside of the seedling tray 2. This allows the substrate tray 1 at one end to receive water and increases the contact efficiency between the substrate tray 1 and the outside air. Over time, under the periodic movement of the support 23, the perforated plate 21 rotates in the opposite direction, causing the submerged end to gradually rise and the exposed end to gradually descend. Therefore, during long-term breeding operations, the seedlings on the substrate tray 1 can grow more efficiently. Alternating watering and aeration provide better support for seedling growth. It's important to understand that during the ascent of the submerged end, due to gravity, some water on the substrate tray 1 and the perforated plate 21 will flow along the slope to the other end, resulting in more even watering of the rice seedlings in the substrate tray 1. Furthermore, during the frequent rising and falling, when the perforated plate 21 rotates downwards, the corresponding substrate tray 1, after descending below the liquid surface, will be impacted by the water flow, causing a brief separation between the substrate tray 1 and the perforated plate 21. This prevents the substrate tray 1 from becoming too tightly bound to the perforated plate 21 during seedling root growth. Simultaneously, due to the brief separation of the substrate tray 1 and the perforated plate 21 during repeated separations...Providing ample space for seedling root growth, and with the stable connection between the substrate tray 1 and the perforated tray, it offers better support for root extension.

[0050] This invention, by setting up an elevated oxygen-permeable mechanism, allows the perforated plate 21 to rotate periodically in both directions within the seedling tray 2 during the day when temperatures rise. This causes the substrate tray 1 to periodically change between water replenishment and aeration. Combined with the permeable holes in the seedling tray 2, this not only allows for convenient and frequent small-volume water replenishment for rice seedlings, but also reduces the probability of root hypoxia by controlling water and aeration, thus providing better support for the growth of rice seedlings.

[0051] In a preferred embodiment of the present invention, the control component includes a knob 24, a spring 26, a control lever 3, and a telescopic cylinder 32;

[0052] The seedling tray 2 is provided with a rotating groove 25 and a straight sliding groove 31. A knob 24 and a spring 26 are rotatably installed in the rotating groove 25. The two ends of the spring 26 are fixedly connected to the knob 24 and the seedling tray 2, respectively.

[0053] The control rod 3 is slidably installed in the linear slide groove 31, the linear slide groove 31 is connected to the rotating groove 25, the control rod 3 is a C-shaped structure, the control rod 3 extends into the rotating groove 25, and during the rotation of the knob 24, the two ends of the control rod 3 are alternately pushed to move.

[0054] Telescopic cylinders 32 are fixedly installed at both ends of the linear slide 31. The telescopic cylinders 32 are located on the reciprocating sliding path of the control rod 3. The telescopic cylinders 32 are respectively connected to the two support seats 23 through pipes.

[0055] The seedling tray 2 has a slot 33, which is coaxially distributed with the rotating groove 25. The knob 24 extends into the slot 33, and a push-out spring 34 is fixedly installed inside the slot 33. In the initial state, under the support of the push-out spring 34, the control rod 3 is located on the rotation path of the knob 24.

[0056] Each of the telescopic cylinders 32 has a flow-limiting rod 35 threadedly installed at its output end. One end of the flow-limiting rod 35 extends into the inside of the output end of the telescopic cylinder 32, and the other end extends into the outside of the seedling tray 2. An adjustment cap 36 is fixedly installed at the end of the flow-limiting rod 35 located on the outside of the seedling tray 2.

[0057] To reduce the workload of workers, in this invention, when controlling the support base 23 to perform periodic lifting and lowering, the worker only needs to manually press the knob 24, causing the knob 24 to press the ejector spring 34 in the slot 33, causing the knob 24 to misalign with the control rod 3, and then rotate the knob 24, causing the spring 26 to gradually wind up. Finally, the worker releases the pressure on the knob 24, and under the action of the ejector spring 34, the knob 24 aligns with the control rod 3. During the process of the spring 26 releasing its elastic potential energy, the knob 24 rotates. When the knob 24 rotates to the side of the control rod 3, since both ends of the control rod 3 are located on the rotation path of the knob 24, and both ends of the control rod 3 are conical, the knob 24 generates a pushing force on the control rod 3, causing the control rod 3 to slide in the linear slide groove 31. During the sliding process of the control rod 3, it will squeeze the telescopic cylinder 32 on one side and separate it from the telescopic cylinder 32 on the other side. The squeezed telescopic cylinder 32 will then pass the internal fluid through the pipe. The feed is delivered to the support base 23, causing the perforated plate 21 to rotate. When the knob 24 passes the end of the current control lever 3 and presses the other end of the control lever 3, the control lever 3 will move in the opposite direction in the linear slide 31, ultimately causing the rotation direction of the perforated plate 21 to change again. During the continuous rotation of the knob 24, the perforated plate 21 rotates periodically in both directions, thereby causing the seedlings on the substrate tray 1 to periodically switch between watering and aeration. In addition, the present invention also includes a flow-limiting rod 35 and an adjusting cap 36. In practical applications, the seedling grower can manually turn the adjusting cap 36 to extend or push the flow-limiting rod 35 towards the output end of the telescopic cylinder 32, thereby adjusting the flow rate of the telescopic cylinder 32 to adjust the length of the perforated plate rotation cycle. It should be noted that the outer wall of the seedling tray 2 is engraved with a scale corresponding to the rotation angle of the adjusting cap 36 and the flow rate of the telescopic cylinder 32, so as to facilitate the adjustment by the seedling grower.

[0058] In other embodiments of this application, the spring 26 can also be driven by a rotary motor, and the control circuit controls the rotation of the knob 24 to achieve periodic lifting and lowering control of the support base 23, further enhancing the ease of use of the equipment.

[0059] As a preferred embodiment of the present invention, it further includes an anti-blocking separation mechanism, which is installed on the perforated plate 21 and is used to prevent the roots of rice seedlings from blocking the holes of the perforated plate 21.

[0060] The anti-blocking separation mechanism includes a lifting rod 4, a connecting plate 41, and a support spring 42;

[0061] The lifting rods 4 are all fixedly installed on the connecting plate 41. The lifting rods 4 extend through the holes of the perforated plate 21 to the bottom of the substrate floppy disk 1. The lifting rods 4 are used to lift the substrate floppy disk 1. The perforated plate 21 and the connecting plate 41 are elastically connected by the support spring 42.

[0062] All lifting rods 4 are spring telescopic rods. The end of the lifting rod 4 away from the connecting plate 41 is T-shaped and made of elastic rubber material. The lifting rod 4 made of spring telescopic rod can reduce the probability of root breakage when lifting the seedling roots to separate from the hollow plate 21 by utilizing the elastic buffering effect.

[0063] An arc block 43 is installed inside the seedling tray 2. The arc block 43 is provided with evenly distributed protrusions 44. The protrusions 44 are all made of elastic material and are located on the rotation path of the hollow plate 21.

[0064] Because the impact force and impact area of ​​the water flow are relatively small during the rotation of the perforated plate 21 and the substrate tray 1, in order to prevent rice seedlings from filling the gaps in the perforated plate 21 and affecting the diffusion of air through the perforated plate 21 to the roots, this invention is equipped with an anti-blocking separation mechanism. In practical application, when both ends of the perforated plate 21 are periodically raised and lowered, one end of the perforated plate 21 continuously descends. As the gap between the perforated plate 21 and the bottom wall of the seedling tray 2 continues to decrease, the connecting plate 41 located below the perforated plate 21 is obstructed by the protrusion 44 on the arc block 43, thereby causing the connecting plate 41 to overcome the support spring 42 and gradually approach the perforated plate 21. The lifting rod 4 installed on the connecting plate 41 passes through the holes in the perforated plate 21 and presses against the substrate tray 1 or the seedling roots. Through continuous lifting, the seedling roots and the substrate tray gradually move away from the perforated plate 21, realizing the separation of the seedling roots. The separation from the perforated plate serves two purposes: firstly, it reduces the depth at which the substrate tray 1 and the seedlings are submerged in water; secondly, it prevents the seedling roots from overfilling the gaps in the perforated plate 21. As the perforated plate 21 continues to rotate, the protrusion 44 gradually deforms. When the protrusion 44 completely retracts into the arc block 43, the restriction of the protrusion 44 on the connecting plate 41 fails, causing the connecting plate 41 to quickly move away from the perforated plate 21 under the action of the support spring 42, and finally be obstructed by the next protrusion 44. This design utilizes the intermittent interception of the connecting plate 41 by the protrusion 44, allowing the lifting rod 4 to lift the seedling roots or substrate tray 1 multiple times. The lifting rod 4, made with a spring telescopic rod, can use multiple elastic impacts to promote the separation of the seedling roots from the perforated plate 21. At the same time, multiple elastic impacts, compared with direct lifting, can also reduce the probability of seedling root breakage.

[0065] In a preferred embodiment of the present invention, guide plates 5 are fixedly installed on both sides of the hollow plate 21, and guide grooves 51 are provided on the guide plates 5. Pressure rollers 52 are slidably installed on the guide plates 5 through the guide grooves 51.

[0066] The guide groove 51 is C-shaped with its opening facing upwards. The pressure roller 52 is located inside the guide groove 51, and its diameter at one end is smaller than the height of the guide groove 51. The arrangement of the guide groove 51 and the pressure roller 52 allows the pressure roller 52 to roll on the substrate disk 1 under the guidance of gravity during the deflection of the perforated plate 21 and the substrate disk 1, thereby pressing down on the rice seedlings and assisting in their development. Pressing down on rice seedlings is one of the commonly used techniques in rice seedling cultivation, and will not be elaborated on further here.

[0067] The guide plate 5 is provided with a sliding groove 53 below the hollow plate 21. The connecting plate 41 extends into the sliding groove 53. The sliding groove 53 is used to control the connecting plate 41 to remain parallel to the hollow plate 21. The sliding groove 53 is designed to restrict the connecting plate 41 when one end of the connecting plate 41 is obstructed, so that the connecting plate 41 can only move in a straight line relative to the sliding groove 53. This allows the connecting plate 41 to move closer to or further away from the hollow plate 21 while maintaining a horizontal position. In other words, no matter which end of the hollow plate 21 descends, the lifting rod 4 on the connecting plate 41 can elastically impact the substrate floppy disk 1. When the hollow plate 21 tends to be horizontal, the connecting plate 41 moves away from the hollow plate 21.

[0068] The foregoing has shown and described 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 to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bottomless rice seedling tray for rice cultivation, comprising a substrate tray (1) and a seedling tray body (2) for storing the substrate tray (1); characterized in that It also includes an overhead oxygen permeation mechanism, which is installed between the seedling tray (2) and the substrate tray (1). The overhead oxygen permeation mechanism reduces the probability of seedling hypoxia on the substrate tray (1) by means of overhead. The overhead oxygen permeation mechanism includes: A perforated plate (21) is installed in the seedling tray (2). The substrate soft tray (1) is evenly arranged on the perforated plate (21). A rotating shaft (22) is fixedly installed in the middle of the perforated plate (21). The perforated plate (21) is rotated and installed in the seedling tray (2) through the rotating shaft (22). Support base (23): The seedling tray (2) is equipped with a support base (23). The support base (23) is located at both ends of the bottom of the hollow plate (21). In the initial state, the support base (23) cooperates with the rotating shaft (22) to support the hollow plate (21). The support base (23) is a lifting rod. The control component is installed on the outside of the seedling tray (2) and is used to control the periodic lifting and lowering of the support base (23); The control components include a knob (24), a spring (26), a control lever (3), and a telescopic cylinder (32). The seedling tray (2) is provided with a rotating groove (25) and a straight sliding groove (31). A knob (24) and a spring (26) are rotatably installed in the rotating groove (25). The two ends of the spring (26) are fixedly connected to the knob (24) and the seedling tray (2) respectively. The control rod (3) is slidably installed in the linear slide groove (31), the linear slide groove (31) is connected to the rotating groove (25), the control rod (3) is a C-shaped structure, the control rod (3) extends into the rotating groove (25), and during the rotation of the knob (24), the two ends of the control rod (3) are alternately pushed to move. Telescopic cylinders (32) are fixedly installed at both ends of the linear slide (31). The telescopic cylinders (32) are located on the reciprocating sliding path of the control rod (3). The telescopic cylinders (32) are connected to the two support seats (23) through pipes respectively.

2. The soil-less rice seedling raising tray for rice cultivation according to claim 1, characterized in that: The seedling tray (2) has a slot (33) on it. The slot (33) and the rotating groove (25) are coaxially distributed. The knob (24) extends into the slot (33). A push-out spring (34) is fixedly installed inside the slot (33). In the initial state, under the support of the push-out spring (34), the control rod (3) is located on the rotation path of the knob (24).

3. The soil-less rice seedling raising tray for rice cultivation according to claim 2, characterized in that: Each of the telescopic cylinders (32) has a flow-limiting rod (35) threadedly installed at its output end. One end of the flow-limiting rod (35) extends into the inside of the output end of the telescopic cylinder (32), and the other end extends into the outside of the seedling tray (2). An adjusting cap (36) is fixedly installed at the end of the flow-limiting rod (35) located on the outside of the seedling tray (2).

4. The soil-less rice seedling raising tray for rice cultivation according to claim 1 or 3, characterized in that: It also includes an anti-blocking separation mechanism, which is installed on the perforated plate (21) and is used to prevent the roots of rice seedlings from blocking the holes of the perforated plate (21); The anti-blocking separation mechanism includes a lifting rod (4), a connecting plate (41), and a support spring (42). The lifting rods (4) are all fixedly installed on the connecting plate (41). The lifting rods (4) extend through the holes of the perforated plate (21) to the bottom of the substrate floppy disk (1). The lifting rods (4) are used to lift the substrate floppy disk (1). The perforated plate (21) and the connecting plate (41) are elastically connected by a support spring (42).

5. A bottomless rice seedling tray for rice cultivation according to claim 4, characterized in that: The lifting rods (4) are all spring telescopic rods. The end of the lifting rod (4) away from the connecting plate (41) is T-shaped and made of elastic rubber material.

6. A bottomless rice seedling tray for rice cultivation according to claim 5, characterized in that: The seedling tray (2) is equipped with an arc block (43) inside. The arc block (43) is provided with evenly distributed protrusions (44). The protrusions (44) are all made of elastic material and are located on the rotation path of the hollow plate (21).

7. A bottomless rice seedling tray for rice cultivation according to claim 6, characterized in that: Guide plates (5) are fixedly installed on both sides of the hollow plate (21). Guide grooves (51) are provided on the guide plates (5). Pressure rollers (52) are slidably installed on the guide plates (5) through the guide grooves (51).

8. A bottomless rice seedling tray for rice cultivation according to claim 7, characterized in that: The guide groove (51) is C-shaped with the opening facing upwards, and the diameter of one end of the pressure roller (52) inside the guide groove (51) is smaller than the height of the guide groove (51).

9. A bottomless rice seedling tray for rice cultivation according to claim 8, characterized in that: The guide plate (5) is located below the hollow plate (21) and has a sliding groove (53). The connecting plate (41) extends into the sliding groove (53). The sliding groove (53) is used to control the connecting plate (41) and the hollow plate (21) to remain parallel.

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