Tobacco planting and seedling raising device and method

Abstract

This invention relates to the field of planting and seedling cultivation technology, specifically disclosing a tobacco planting and seedling cultivation device and method. The device includes a water storage tray and several seedling cultivation units arranged in an array on the water storage tray. The seedling cultivation unit comprises a seedling cultivation module, a seedling guiding module, a soil loosening component, and a growth linkage adjustment module. The seedling cultivation module is used for planting and cultivating tobacco seedlings. The seedling guiding module is located within the seedling cultivation module and is used to guide seedling growth, moving synchronously as the seedlings grow. The soil loosening component is located within the substrate layer of the seedling cultivation module and is used to loosen the substrate. The growth linkage adjustment module includes a magnet, a linear Hall sensor, and a control system. The magnet is fixed to the seedling guiding module and moves synchronously with it. The linear Hall sensor is fixed above the magnet and is positioned opposite to the magnet component. This allows the soil loosening operation to accurately match the differentiated substrate looseness requirements of tobacco seedlings from the seedling stage to the mature seedling stage.

Description

Technical Field

[0001] This invention relates to the field of planting and seedling cultivation technology, and specifically discloses a tobacco planting and seedling cultivation device and method. Background Technology

[0002] In current tobacco seedling cultivation techniques, seedling pots are commonly used for centralized cultivation. The substrate layer fixes the seedling roots and provides nutrients for growth, while relying on manual or automatic water supply systems to maintain substrate moisture. Because tobacco seedlings grow rapidly during the seedling stage (especially from the seedling stage to the mature seedling stage), the substrate layer is prone to compaction due to watering, root entanglement, and other factors, leading to reduced aeration and hindered nutrient absorption. Therefore, it is necessary to loosen the substrate layer regularly to ensure root respiration and nutrient transport efficiency.

[0003] Currently, three main technical solutions are used for loosening soil in seedling cultivation: First, manual loosening, which involves manually turning over the surface of the substrate using tools. However, this method is labor-intensive, inefficient, and the loosening force is entirely dependent on experience. Excessive force can damage the seedling roots, while insufficient force can lead to incomplete loosening. Second, mechanical timed loosening devices, which drive the loosening components to work at preset time intervals. However, these devices cannot sense the growth status of the seedlings and use a fixed loosening force and cycle regardless of the seedling height or stem thickness. When the seedlings are in the seedling stage, excessive force can easily cause damage, while in the mature seedling stage, insufficient force may fail to break up deep compaction.

[0004] Therefore, in summary, the main shortcomings of the existing technology are: the soil loosening operation parameters (intensity, cycle) are disconnected from the seedling growth status, making it impossible to achieve closed-loop control of "seedling growth - status perception - parameter adjustment - precise soil loosening". Either it relies on human experience, resulting in insufficient standardization, or it has poor adaptability due to fixed parameter settings, making it difficult to take into account the different needs of tobacco seedlings at different growth stages for substrate looseness, thus affecting the seedling survival rate and seedling vigor rate. Summary of the Invention

[0005] The purpose of this invention is to provide a tobacco planting and seedling raising device to at least solve one of the aforementioned problems existing in the prior art.

[0006] Specifically, the present invention is achieved through the following technical solution:

[0007] A tobacco planting and seedling raising device, the device includes a water storage tray and a plurality of seedling raising units arranged in an array on the water storage tray, the seedling raising unit including a seedling raising module, a seedling guiding module, a soil loosening component and a growth linkage adjustment module;

[0008] The seedling module is used for planting and cultivating tobacco seedlings;

[0009] The seedling guidance module is located inside the seedling module and is used to guide the growth of the seedlings, and moves and rises synchronously as the seedlings grow.

[0010] The soil loosening component is located within the substrate layer of the seedling module and is used to loosen the substrate.

[0011] The growth linkage adjustment module includes a magnet, a linear Hall sensor, and a control system; wherein...

[0012] The magnet is fixed to the seedling guide module and moves synchronously with the seedling guide module;

[0013] The linear Hall sensor is fixed above the magnet and is positioned opposite to the magnet component. It is used to output a current voltage signal that increases with the height of the seedling.

[0014] The control system is located on the seedling module and includes a threshold comparison unit, a timed start unit, and a drive unit. The threshold comparison unit is preset with a standard voltage signal corresponding to the seedling stage and is connected to the linear Hall sensor signal. When the threshold comparison unit receives the current voltage signal and determines that it is greater than the standard voltage signal, it controls the timed start unit to output a trigger signal to the drive unit at a preset interval. The drive unit is connected to the soil loosening component. After receiving the trigger signal, the drive unit controls the soil loosening component to perform timed soil loosening work according to a preset soil loosening time and basic soil loosening force. The basic soil loosening force gradually increases with the increase of the current voltage signal.

[0015] This technical solution provides a planting foundation for tobacco seedling cultivation by setting up a seedling module. A seedling guide module moves synchronously with the seedling growth to drive a magnet, and a linear Hall sensor collects the current voltage signal as the seedling height increases in real time. The control system's threshold comparison unit determines the seedling growth stage, triggering a timed start unit. The drive unit then dynamically adjusts the soil loosening force of the loosening component based on the current voltage signal (increasing with seedling height). This solution specifically addresses the technical problem in existing technologies where soil loosening parameters (force, cycle) are disconnected from seedling growth status and cannot be dynamically adapted to different growth stages. It achieves closed-loop control of "seedling height sensing—growth stage judgment—dynamic adjustment of soil loosening force," enabling precise matching of the soil loosening operation to the differentiated substrate looseness requirements of tobacco seedlings from the seedling stage to the mature seedling stage. This improves the standardization and adaptability of the seedling cultivation process, effectively ensuring root respiration and nutrient absorption, thereby increasing the seedling survival rate and robustness rate of the device.

[0016] Based on the above-mentioned scheme, a tobacco planting and seedling raising device is proposed. Specifically, this method includes:

[0017] Step 1: Seedling preparation. Fill the substrate chamber of the seedling module with the seedling substrate to form a substrate layer. Plant the tobacco seedlings into the substrate layer and let the stems pass through the through holes of the partition. The base of the stems is held by the flexible clamping ring of the seedling guide module so that the initial position of the follow-up ring is adapted to the height of the seedling. At the same time, the water storage chamber is connected to the substrate layer through the water absorption device.

[0018] Step 2: Growth signal monitoring. During the seedling growth process, the follower ring slides upward along the guide rod as the stem rises, driving the magnet to move synchronously. The linear Hall sensor collects the current voltage signal that increases with the seedling height in real time and transmits it to the control system. At the same time, the pressure sensor collects the current pressure signal of the flexible clamping ring being squeezed by the stem in real time and transmits it to the growth status matching unit.

[0019] Step 3: Soil loosening start judgment. The threshold comparison unit of the control system compares the current voltage signal with the standard voltage signal. When the current voltage signal is greater than the standard voltage signal, it is determined that the seedling has entered the non-seedling stage, and the timed start unit is triggered to output the soil loosening trigger signal to the drive unit at a preset interval.

[0020] Step 4: Foundation loosening control. After receiving the trigger signal, the drive unit controls the loosening component to start the loosening operation for a preset time. The power regulator adjusts the output power of the drive motor in real time according to the current voltage signal, so that the foundation loosening force gradually increases as the current voltage signal increases.

[0021] Step 5: Abnormal state adjustment. The growth state matching unit compares the current pressure signal with the current standard pressure range of the corresponding current voltage signal. If the current pressure signal is not within the range, the control system immediately controls the drive unit to reduce the soil loosening force and controls the timed start unit to extend the soil loosening interval. If the current pressure signal returns to the standard range, the soil loosening parameters of Step 4 are restored.

[0022] Step 6: Repeat steps 2-5 until the seedlings have completed their seedling growth cycle. Stop loosening the soil and transplant the tobacco seedlings after the seedling growth is complete.

[0023] Based on the above-mentioned planting and seedling raising method, it cleverly combines the structure of the planting and seedling raising device with growth regulation logic to form a closed-loop control process that integrates real-time growth signal perception, dynamic adaptation of soil loosening parameters, and precise intervention in abnormal states. This achieves quantitative tracking of seedling growth status (plant height and stem diameter), providing a scientific basis for subsequent regulation. Simultaneously, based on the seedling growth height, the magnet approaches the linear Hall sensor to generate a voltage signal, dynamically initiating soil loosening and matching the increasing force. This avoids root damage from premature soil loosening in the seedling stage while ensuring effective loosening of the deep substrate during the seedling stage, solving the problem that the timing and force of soil loosening in existing seedling raising devices cannot be adapted to the seedling growth stage. This method addresses technical issues and incorporates anomaly adjustment logic. By coordinating plant height and stem diameter, it promptly adjusts the intensity and frequency of soil loosening when growth becomes unbalanced. This prevents excessive loosening of the soil from exacerbating root damage in overly vigorous seedlings or seedlings with excessive nutrients. Once the plant's condition returns to normal, the parameters are automatically restored. This solves the problem of exacerbating growth imbalance caused by single-index control, ensuring that the soil loosening action throughout the entire planting and seedling cultivation method is synchronized with the actual needs of the seedlings. Ultimately, it achieves precise matching between substrate looseness and root development throughout the seedling cycle, significantly improving the rate of robust tobacco seedlings and growth consistency, while reducing the cost of manual intervention. This provides efficient and stable technical support for large-scale tobacco seedling cultivation.

[0024] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0025] (1) This invention provides a planting foundation for tobacco seedling cultivation by setting up a seedling module, and uses a seedling guide module to move synchronously with the growth of tobacco seedlings to drive the magnet. In addition, a linear Hall sensor collects the current voltage signal that increases with the seedling height in real time. Then, the threshold comparison unit of the control system judges the growth stage of the seedling, triggers the timed start unit, and the drive unit dynamically adjusts the basic soil loosening force of the soil loosening component according to the current voltage signal (increasing with the seedling height). It realizes closed-loop control of seedling height perception, growth stage judgment and dynamic adjustment of soil loosening force, so that the soil loosening operation can accurately match the differentiated needs of tobacco seedlings for substrate looseness from the seedling stage to the mature seedling stage, improve the standardization level and adaptability of the seedling cultivation process, effectively ensure root respiration and nutrient absorption, and thus improve the seedling survival rate and strong seedling rate of tobacco seedling cultivation and planting.

[0026] (2) By setting a sliding mechanism for the seedling guide module, the present invention enables the follower ring to squeeze the anti-detachment plate to pass smoothly when it slides upward with the seedling growth, and when it is subjected to downward force, the slider and the anti-detachment plate form a locking contact to prevent downward movement. This achieves precise synchronization between the follower ring and the seedling growth, ensuring that the position of the magnet follows the changes in seedling height. This ensures that the current voltage signal collected by the linear Hall sensor can accurately reflect the actual height of the seedling, providing a reliable signal basis for the control system to dynamically adjust the soil loosening force according to the seedling height. At the same time, it avoids mechanical obstruction of seedling growth during the follower process, improving the accuracy of the device in sensing the growth height of tobacco seedlings and the safety of the seedling raising process.

[0027] (3) This invention sets a pressure sensor in the flexible clamping ring of the seedling guide module and adds a growth state matching unit in the control system to construct a growth matching relationship between seedling height and stem diameter. The growth state matching unit can accurately determine whether the seedling is growing excessively or growing slowly by comparing the current pressure signal (stem diameter) with the standard pressure range of the corresponding current voltage signal (seedling height). In case of abnormality, the soil loosening force is reduced and the cycle is extended in time to avoid excessive soil loosening aggravating the imbalance. After the state returns to normal, the parameters are restored. This realizes the refined control of real-time detection of growth state and abnormal dynamic soil loosening intervention, which significantly improves the adaptability of the device to abnormal seedling growth and ensures the robustness and stability of seedling growth during the seedling raising process.

[0028] (4) The planting and seedling raising method provided by the present invention, through the cooperation of tobacco planting and seedling raising device, dynamically senses the growth status and matches the soil loosening strategy, which not only breaks the traditional understanding that loosening soil will damage the roots, but also realizes the precise satisfaction of the soil loosening needs at different growth stages. Finally, through the cyclical operation of the whole method, the soil loosening is always synchronized with the actual needs of the seedlings, realizing the precise matching of substrate looseness and root development within the seedling raising cycle, ensuring the substrate looseness requirements of tobacco seedlings at different growth stages, significantly improving the seedling strength rate and root development quality, while reducing the cost of artificial intervention, and providing efficient and stable technical support for large-scale tobacco seedling raising. Attached Figure Description

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 A partial structural diagram of the seedling cultivation module;

[0032] Figure 3 This is a partially enlarged schematic diagram of the follower ring structure of the present invention;

[0033] Figure 4 This is a partially enlarged structural schematic diagram of the soil loosening component of the present invention;

[0034] Figure 5 This is a schematic diagram of the planting and seedling raising method of the present invention.

[0035] In the above figures, the reference numerals represent: 1. Seedling pot; 11. Partition; 12. Substrate chamber; 131. Guide rod; 132. Follower ring; 133. Magnet; 134. Linear Hall sensor; 135. Slide groove; 136. Anti-detachment plate; 137. Slider; 138. Flexible clamping ring; 139. Pressure sensor; 14. Interlayer cavity; 141. Sealing plate; 142. Mounting cavity; 143. Water storage cavity; 151. Drive motor; 152. Horizontal shaft; 153. Soil loosening shaft; 154. Soil loosening teeth; 155. Gear groove; 156. Gear; 16. Water suction component; 2. Water storage tray. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are only for explaining the invention and are not intended to limit the invention. The embodiments described below are some, but not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods have not been specifically described to avoid obscuring the invention. Unless otherwise specified, the materials, instruments, and reagents used in the following embodiments are commercially available. Unless otherwise specified, the techniques used in the embodiments are conventional methods well known to those skilled in the art.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] Example 1:

[0040] Please also refer to Figures 1 to 4As shown, this embodiment discloses a tobacco planting and seedling raising device. The device includes a water storage pan 2 and a plurality of seedling raising units arranged in an array on the water storage pan 2. The seedling raising unit includes a seedling raising module, a seedling guiding module, a soil loosening component, and a growth linkage adjustment module.

[0041] The seedling module is used for planting and cultivating tobacco seedlings;

[0042] The seedling guidance module is located inside the seedling module and is used to guide the growth of the seedlings, and moves and rises synchronously as the seedlings grow.

[0043] The soil loosening component is located within the substrate layer of the seedling module and is used to loosen the substrate.

[0044] The growth linkage adjustment module includes a magnet 133, a linear Hall sensor 134, and a control system; wherein...

[0045] The magnet 133 is fixed to the seedling guide module and moves synchronously with the seedling guide module;

[0046] The linear Hall sensor 134 is fixed above the magnet 133 and is positioned opposite to the magnet 133 component. It is used to output the current voltage signal that increases with the height of the seedling.

[0047] The control system is located on the seedling module and includes a threshold comparison unit, a timed start unit, and a drive unit. The threshold comparison unit is preset with a standard voltage signal corresponding to the seedling stage and is connected to the linear Hall sensor 134. When the threshold comparison unit receives the current voltage signal and determines that it is greater than the standard voltage signal, it controls the timed start unit to output a trigger signal to the drive unit at a preset interval. The drive unit is connected to the soil loosening component. After receiving the trigger signal, the drive unit controls the soil loosening component to perform timed soil loosening work according to a preset soil loosening time and basic soil loosening force. The basic soil loosening force gradually increases with the increase of the current voltage signal.

[0048] It should be noted that in the above embodiments, the seedling module refers to the container structure that supports the growth of seedlings. They are distributed in a rectangular array in the water storage pan 2 through connecting rods. The magnet 133 refers to the permanent magnet fixed on the guide module. Its displacement changes the magnetic field strength. The linear Hall sensor 134 refers to the detection element that converts the magnetic field change into a linear voltage signal. For example, it can be an AH49E series integrated circuit. The threshold comparison unit refers to the comparison circuit with a preset voltage threshold. For example, it can be a comparator module based on an operational amplifier. The timing start unit refers to the periodic signal generator. For example, it can be a trigger circuit composed of a timer.

[0049] Understandably, tobacco seedlings exhibit distinct stages of growth during the planting and seedling stage. From the seedling stage to the mature seedling stage, the increase in plant height is strongly correlated with the depth and development of the root system. During the seedling stage, when the plant height is low, the roots are mostly concentrated in the surface layer of the substrate and are thin and fragile, requiring less soil loosening. As the plant height increases, the roots gradually extend into the deeper layers of the substrate and thicken. The deeper layers of the substrate are prone to compaction due to root entanglement and watering, requiring more vigorous soil loosening to break up the compaction and ensure the respiration of the deeper roots.

[0050] Therefore, in the cultivation process, the planting and seedling raising device of this embodiment detects the height of the seedlings and uses "plant height growth" as a key quantitative indicator reflecting the growth stage of the seedlings and the root development status. Based on the mapping relationship of "plant height-root development-soil loosening requirement", combined with the easily detectable and continuously quantifiable indicator of seedling height during tobacco growth, it indirectly senses the changes in the root growth status's requirement for substrate looseness. This solves the problem in the prior art where the soil loosening parameters are disconnected from the root requirements due to the lack of quantitative indicators for growth stages, and provides a scientific and feasible signal basis for accurately matching the soil loosening intensity at different growth stages.

[0051] Specifically, when the tobacco planting and seedling raising device is implemented, several seedling raising units are arrayed on the water storage pan 2. Tobacco seedlings are planted in the substrate layer of the seedling raising module. The seedling guiding module rises synchronously with the growth of the seedlings and drives the magnet 133 to move. The linear Hall sensor 134 outputs a current voltage signal that increases with the seedling height due to the change in the position of the magnet 133. The threshold comparison unit of the control system compares this signal with the preset standard voltage signal for the seedling stage. When the current voltage signal is greater than the standard value, it is determined that the seedling has entered the seedling stage. The timed start unit is triggered to send a trigger signal to the drive unit at a preset interval. The drive unit then controls the soil loosening component to loosen the soil for a preset time. The soil loosening force increases with the increase of the current voltage signal (seedling height). The seedling height is monitored through the linkage between the magnet 133 and the Hall sensor. Combined with the threshold judgment and timed drive mechanism of the control system, the soil loosening operation is accurately matched with the seedling growth stage, avoiding excessive soil loosening in the seedling stage or insufficient soil loosening in the seedling stage.

[0052] This allows for precise quantification of growth status through non-contact displacement detection, enabling the establishment of a dynamic adjustment mechanism for soil loosening parameters. By combining the positive correlation between seedling height and soil loosening intensity, gradient control of the loosening intensity is achieved, realizing dynamic matching between soil loosening operation parameters and seedling growth status. Furthermore, it can automatically suppress soil loosening during the seedling stage to avoid damage to the fragile root system. As the seedlings mature, the loosening intensity gradually increases with plant height, effectively breaking up deep soil compaction. Simultaneously, periodic soil loosening avoids continuous work that could damage the substrate structure. This significantly improves the accuracy and adaptability of the seedling device in soil loosening operations, reduces the need for manual intervention, and ensures the standardization and stability of tobacco seedling cultivation.

[0053] In a further embodiment, such as Figure 2 As shown, the seedling module includes a seedling pot 1, and a partition 11 is provided in the middle of the seedling pot 1. The partition 11 is used to divide the lower part of the seedling pot into a substrate chamber 12. The substrate chamber 12 is used to place the seedling substrate and form a substrate layer. The partition 11 has a through hole in the middle for the seedlings to pass through.

[0054] Specifically, the lower space of the seedling pot 1 is divided into a substrate compartment 12 by the partition 11, so that the seedling substrate is confined to a fixed area, avoiding the disruption of the substrate layer structure caused by watering or root expansion during the growth of tobacco seedlings, and ensuring that the substrate layer remains stable throughout the tobacco seedling cultivation cycle, ensuring normal seedling growth. In addition, the through hole in the middle of the partition 11 allows the seedling stem to pass through, ensuring that its growth path is not physically obstructed.

[0055] In some preferred embodiments, such as Figure 2 As shown, the seedling guiding module includes a guide rod 131 and a follower ring 132. The guide rod 131 is vertically inserted into the partition 11 near the through hole, and its top end is connected to the linear Hall sensor 134. The follower ring 132 is located on the side of the guide rod 131 and directly above the through hole. The upper part of the follower ring 132 is connected to the magnet 133. The follower ring 132 and the guide rod 131 are slidably connected by a sliding mechanism. The sliding mechanism includes a groove 135, an anti-detachment plate 136, a slider 137, and a connecting rod. The groove 135 is opened along the axial direction of the guide rod 131 on its side, and the anti-detachment plates 136 are equidistantly distributed in the groove 135. Within 5, one side of the anti-detachment plate 136 is connected to the bottom of the groove 135 via a rotating torsion spring. The slider 137 is slidably embedded in the groove 135 and connected to the follower ring 132 via a connecting rod. The rotating torsion spring is configured such that: in its natural state, the free end of the anti-detachment plate 136 is inclined and extended; when the slider 137 slides upward along the groove 135, it presses the free end of the anti-detachment plate 136, forcing the anti-detachment plate 136 to rotate around the rotating torsion spring toward the bottom of the groove 135, so as to allow the slider 137 to pass; when the slider 137 is subjected to a downward force, the lower surface of the slider 137 contacts the inclined surface of the anti-detachment plate 136 and forms a snap-fit, preventing the slider 137 from sliding down.

[0056] It should be understood that in the above embodiments, the rotating torsion spring refers to the elastic element that provides the reset force of the anti-detachment plate 136. Specifically, a stainless steel spring can be used, and its torque parameter needs to meet the requirement that the anti-detachment plate 136 is compressed when the slider 137 moves upward and automatically resets to form a mechanical lock when it moves downward.

[0057] This embodiment solves the technical problem of inaccurate growth status signal acquisition caused by the existing seedling guide component being unable to stably follow the seedling growth and rise synchronously (easily sliding down or getting stuck) by setting up a guide rod 131, a follower ring 132 and a specific sliding mechanism. Specifically: When the seedling grows and the stem rises, the stem drives the follower ring 132 upward through the flexible clamping ring 138. The slider 137 connected to the follower ring 132 slides upward along the groove 135 of the guide rod 131. At this time, the slider 137 presses the free end of the anti-detachment plate 136, forcing the anti-detachment plate 136 to rotate around the rotating torsion spring towards the bottom of the groove, allowing the slider 137 to pass smoothly (ensuring that the follower ring 132 does not obstruct the seedling's growth). When the follower ring 132 is subjected to a downward force (such as slight swaying of the seedling or sliding down due to its own weight), the lower surface of the slider 137 contacts the inclined surface of the anti-detachment plate 136 to form a locking action. Under the action of the rotating torsion spring, the anti-detachment plate 136 remains in an inclined extended state, preventing the slider 137 from sliding down (ensuring that the height of the follower ring 132 is in line with the real-time growth of the seedling). (Consistent state) Through this unidirectional limiting sliding structure, the follower ring 132 is precisely synchronized with the growth of the seedlings, and the positional deviation caused by external forces is avoided. This allows the magnet 133 to stably follow the changes in seedling height, ensuring that the current voltage signal collected by the linear Hall sensor 134 accurately reflects the actual height of the seedlings. This provides a reliable signal basis for the subsequent control system to dynamically adjust the soil loosening force according to the seedling height. At the same time, the follower process is smooth and does not cause mechanical obstruction to the growth of the seedlings. This improves the accuracy of the device's perception of the growth height of the tobacco seedlings and the safety of the entire seedling cultivation process. It also achieves precise matching between soil loosening and the growth and development height of the tobacco seedlings, thereby avoiding seedling damage caused by fixed force or insufficient soil loosening due to height errors.

[0058] In some preferred embodiments, such as Figure 3 As shown, the follower ring 132 is further provided with several flexible clamping rings 138 inside. The outer wall of the flexible clamping ring 138 is flexibly clamped to the stem of the seedling through an arc-shaped protrusion. A pressure sensor 139 connected to the control system signal is also attached inside the flexible clamping ring 138. The pressure sensor 139 is used to collect the current pressure signal generated by the flexible clamping ring 138 being squeezed by the stem. The current pressure signal increases as the stem thickness increases.

[0059] Based on the above embodiments, it should be noted that the flexible clamping ring 138 refers to a ring-shaped component made of elastic material, specifically silicone or rubber. Its inner side has an arc-shaped protrusion structure, which generates uniformly distributed contact stress when clamping the stem, preventing excessive local pressure from damaging the stem epidermis. Simultaneously, it forms multi-point flexible contact when clamping the stem, ensuring clamping stability while allowing the stem to naturally thicken during growth. The pressure sensor 139 refers to a thin-film pressure detection element attached to the outer surface of the flexible clamping ring 138, specifically a piezoresistive or capacitive sensor. It detects the deformation of the flexible clamping ring 138 caused by stem compression, converting changes in stem thickness into an electrical signal output. This enables real-time, quantitative monitoring of stem thickness, a growth characteristic, providing the control system with another important growth indicator besides plant height and data support for determining whether seedling growth is balanced.

[0060] Based on the above embodiments, it should also be noted that the control system further includes a growth state matching unit. The growth state matching unit is preset with a current standard pressure range that increases in a stepwise manner as the current voltage signal increases. When the growth state matching unit determines that the current pressure signal collected by the pressure sensor 139 is not within the current standard pressure range, it controls the drive unit to reduce the soil loosening force of the soil loosening component and controls the timed start unit to extend the soil loosening interval.

[0061] It is understandable that during the growth of tobacco seedlings, seedling height (corresponding to voltage signal) and stem diameter (corresponding to pressure signal) should grow in a coordinated manner. However, existing technologies often rely solely on a single growth indicator (such as seedling height) to adjust soil loosening parameters, easily overlooking the balanced growth of seedlings—a single seedling height indicator may mask growth problems caused by abnormal stem diameter (such as excessive vegetative growth or stunted growth), leading to a mismatch between soil loosening parameters and actual growth needs. This embodiment cleverly constructs a "seedling height-stem diameter" growth matching model by setting a growth state matching unit that presets a standard pressure range that increases stepwise with the increase of voltage signal.

[0062] Specifically: The growth status matching unit receives the current voltage signal (reflecting plant height) from the linear Hall sensor 134 and the current pressure signal (reflecting stem diameter) from the pressure sensor 139 in real time. It compares the current pressure signal with the standard pressure range corresponding to the current voltage signal. When the current pressure signal is within the range, it determines that the seedling growth is balanced and maintains the current soil loosening intensity and frequency parameters (basic soil loosening intensity and interval period). However, when the current pressure signal is below the standard range (e.g., plant height is too high but stem diameter is insufficient, possibly due to excessive vegetative growth) or above the standard range (e.g., stem diameter is too thick but plant height growth is slow, possibly due to nutrient excess), it determines that the seedling growth is abnormal and immediately triggers the regulator. The system controls the soil loosening process by reducing the intensity and extending the interval between loosening operations. In other words, when seedling growth becomes unbalanced, the intensity and frequency of loosening are dynamically adjusted to prevent excessive loosening from exacerbating abnormal growth (such as excessively vigorous seedlings becoming thinner due to rapid nutrient absorption caused by overly frequent loosening) or damaging the fragile root system of slow-growing seedlings due to excessive loosening. Normal parameters are then restored once the growth status returns to equilibrium. This achieves refined control through "real-time diagnosis of growth status - timely intervention for abnormalities - dynamic parameter adaptation," significantly improving the adaptability of loosening operations to abnormal seedling growth, ensuring the robustness and stability of seedling growth during the seedling cultivation process, and ultimately improving the rate of robust seedlings and the consistency of seedling quality.

[0063] As an example, when the current voltage signal is 1-2V (corresponding to an actual plant height of 10-20cm, late seedling stage), the preset standard pressure range is 0.5-1N (corresponding to a stem diameter of 0.3-0.5cm at this plant height stage); when the current voltage signal is 2-3V (corresponding to an actual plant height of 20-30cm, early seedling stage), the preset standard pressure range is 1-1.5N (corresponding to a stem diameter of 0.5-0.7cm at this plant height stage); when the current voltage signal is 3-4V (corresponding to an actual plant height of 30-40cm, late seedling stage), the preset standard pressure range is 1.5-2N (corresponding to a stem diameter of 0.5-0.7cm at this plant height stage). (0.7-0.9cm in diameter); If at a certain moment the current voltage signal collected by the linear Hall sensor 134 is 2.5V (corresponding to an actual plant height of 25cm, in the early stage of seedling formation), and the current pressure signal collected by the pressure sensor 139 is 0.8N (corresponding to an actual stem diameter of 0.4cm), this value is lower than the standard pressure range of 1-1.5N corresponding to the early stage of seedling formation, indicating that the actual plant height is up to standard but the stem diameter is insufficient (possibly due to excessive growth); if at the same current voltage signal of 2.5V, the current pressure signal is 1.8N (corresponding to an actual stem diameter of 0.8cm), which is higher than the standard pressure range, it indicates that the stem diameter is too thick while the plant height growth is too slow (possibly due to excessive nutrients).

[0064] The above-mentioned ranges of plant height and stem diameter are based on standardized seedling cultivation practices for conventional tobacco varieties (such as K326 and Yunyan 87): In the late seedling stage (30-40 days old), healthy seedlings typically have a height of 10-20 cm, corresponding to a stem diameter of approximately 0.3-0.5 cm; in the early mature seedling stage (40-50 days old), plant height can reach 20-30 cm, corresponding to a stem diameter of approximately 0.5-0.7 cm; in the late mature seedling stage (50-60 days old), plant height increases to 30-40 cm, corresponding to a stem diameter of approximately 0.7-0.9 cm. The range of m is consistent with the stem diameter and plant height indicators of robust seedlings specified in the "Technical Specification for Tobacco Seedling Cultivation" (YC / T143). The standard pressure range preset by the growth status matching unit is obtained by radial pressure measurement of the stems of tobacco seedlings in the same batch within the above-mentioned stem diameter range (using a miniature pressure sensor 139 with an accuracy of 0.01N). For example, a stem diameter of 0.3-0.5cm corresponds to a pressure of 0.5-1N. This ensures that the device's judgment on the growth status of the seedlings is consistent with the actual physiological characteristics of tobacco seedling cultivation, and provides a reasonable parameter benchmark for the precise control of the device.

[0065] In a further embodiment, such as Figure 2 As shown, a double-layered cavity 14 is provided at the bottom of the seedling pot 1. A sealing plate 141 is provided above the interior of the double-layered cavity 14. The sealing plate 141 divides the double-layered cavity 14 into an installation cavity 142 and a water storage cavity 143 from top to bottom. The installation cavity 142 is used to install the drive unit. The water storage cavity 143 is connected to the water storage tray 2 through a water inlet pipe and is used to store the water required for seedling growth. The water storage cavity 143 is connected to the substrate chamber 12 through a water absorption member 16.

[0066] This embodiment, based on the implementation method, divides the bottom of the seedling pot 1 into an upper mounting cavity 142 and a lower water storage cavity 143 by setting a double-layer cavity 14 separated by a sealing plate 141, thus forming a "functional partition + sealed isolation" structural design: the mounting cavity 142 provides an independent installation space for the drive unit, and is completely isolated from the lower water storage cavity 143 by the sealing plate 141, which can effectively prevent water vapor from entering the water storage cavity 143, avoid the drive unit from short circuits or mechanical corrosion due to moisture, and ensure its long-term stable operation; in addition, the water storage cavity 142... 43 is connected to the water storage tray 2 through the water inlet pipe to achieve continuous water replenishment. At the same time, the water is slowly introduced from the water storage chamber 143 into the substrate chamber 12 with the help of the water absorption component 16 (such as water-absorbing cotton or fiber bundle), which replaces the traditional direct watering method. This can not only avoid substrate compaction caused by watering impact, but also maintain the uniform moisture of the substrate layer, providing a stable water environment for the root system and providing basic support for the stable and efficient seedling process. At the same time, this bottom integrated design also integrates the drive unit installation and water storage function into the seedling pot 1, which significantly improves the structural compactness of the seedling unit.

[0067] Based on the above embodiments, it should be noted that the driving unit includes a driving motor 151. The output end of the driving motor 151 passes through the bottom of the seedling pot 1 and is connected to the soil loosening component. The driving motor 151 is integrated with a driver that is electrically connected to the control system. The driver is equipped with a power regulator. The power regulator adjusts the output power of the driving motor 151 to adjust the basic soil loosening force of the soil loosening component.

[0068] It should be understood that in this embodiment, the driver is electrically connected to the control system and can receive adjustment signals from the threshold comparison unit or the growth state matching unit in real time. The power regulator can change the output power (such as voltage and current) of the drive motor 151, which is then directly converted into the loosening force of the loosening component. The loosening force can be dynamically increased according to the current voltage signal (reflecting plant height) of the linear Hall sensor 134 (to adapt to the need for deeper root systems), and can also be quickly reduced when the growth state matching unit determines an abnormality (to avoid aggravating growth imbalance). This achieves active dynamic adjustment of the loosening force, which not only ensures effective loosening of the deep substrate during the seedling stage, but also avoids root damage caused by excessive force during the seedling stage. This improves the response speed and accuracy of the loosening force adjustment, and ensures that the device accurately matches the needs of loosening operations with the growth requirements of seedlings.

[0069] In some preferred embodiments, such as Figure 4 As shown, the soil loosening assembly includes a horizontal shaft 152 and a soil loosening shaft 153. The horizontal shaft 152 is horizontally disposed inside the substrate chamber 12 and connected to the output end of the drive motor 151. The soil loosening shaft 153 is rotatably sleeved on both ends of the horizontal shaft 152. The outer side of the soil loosening shaft 153 is provided with a plurality of soil loosening protrusions 154. The ends of the soil loosening shaft 153 that are far apart from each other are connected to the side wall of the substrate chamber 12 through a rotating mechanism. The rotating mechanism includes a toothed groove 155 that is opened around the side wall of the substrate chamber 12, a gear 156 that is embedded in the toothed groove 155 and meshes with it, and the side of the gear 156 facing the opening of the toothed groove 155 is connected to the end of the soil loosening shaft 153. A blocking brush is also provided at the opening of the toothed groove 155.

[0070] Based on the above implementation, when the output end of the drive motor 151 drives the horizontal shaft 152 to rotate, the loosening shaft 153 sleeved at both ends of it, due to the meshing relationship between the end gear 156 and the tooth groove 155 on the side wall of the substrate chamber 12, while revolving around the horizontal shaft 152, the gear 156 rolls along the tooth groove 155, which can also force the loosening shaft 153 to rotate around its own axis (that is, rotate on its own axis). This causes the loosening protrusions 154, which are interlaced on the outside, to both perform lateral circular motion with the loosening shaft 153 to cover a wider area of ​​the substrate layer and rotate on their own to achieve rotary cutting and turning of the substrate. This allows it to fully cover the bottom of the substrate layer laterally during loosening operations, thus avoiding blind spots in the loosening process. Simultaneously, the loosening shaft... The loosening force of the 153 shaft can be dynamically adapted by adjusting the power of the drive motor 151. That is, when the seedlings are in the seedling stage, the output power of the drive motor 151 is relatively small, and the movement amplitude and force of the loosening shaft 153 are relatively gentle, which can avoid damaging the shallow roots. When the tobacco seedlings are in the mature seedling stage, the output power of the drive motor 151 increases, and the movement amplitude and force of the loosening shaft 153 are increased simultaneously, effectively breaking the compaction deep in the substrate layer, thereby expanding the loosening coverage area and improving the uniformity of loosening. In addition, the blocking brush can effectively prevent the substrate from entering the meshing point of the toothed groove 155 and the gear 156, thus ensuring smooth transmission and significantly enhancing the substrate loosening effect and durability of the seedling device.

[0071] Example 2:

[0072] Please see Figure 5 As shown, this embodiment is based on Embodiment 1 above and proposes a method for tobacco planting and seedling raising. This method is based on a tobacco planting and seedling raising device, and specifically includes the following steps:

[0073] Step 1: Seedling preparation. Fill the substrate chamber 12 of the seedling module with the seedling substrate to form a substrate layer. Plant the tobacco seedlings into the substrate layer and let the stems pass through the through holes of the partition 11. The base of the stems is held by the flexible clamping ring 138 of the seedling guide module, so that the initial position of the follower ring 132 is adapted to the height of the seedling. At the same time, the water storage chamber 143 establishes a water connection with the substrate layer through the water absorption component 16.

[0074] Step 2: Growth signal monitoring. During the seedling growth process, the follower ring 132 slides upward along the guide rod 131 as the stem rises, driving the magnet 133 to move synchronously. The linear Hall sensor 134 collects the current voltage signal that increases with the seedling height in real time and transmits it to the control system. At the same time, the pressure sensor 139 collects the current pressure signal of the flexible clamping ring 138 under the pressure of the stem in real time and transmits it to the growth status matching unit.

[0075] Step 3: Soil loosening start judgment. The threshold comparison unit of the control system compares the current voltage signal with the standard voltage signal. When the current voltage signal is greater than the standard voltage signal, it is determined that the seedling has entered the non-seedling stage, and the timed start unit is triggered to output the soil loosening trigger signal to the drive unit at a preset interval.

[0076] Step 4: Foundation loosening control. After receiving the trigger signal, the drive unit controls the loosening component to start the loosening operation for a preset time. The power regulator adjusts the output power of the drive motor 151 in real time according to the current voltage signal, so that the foundation loosening force gradually increases as the current voltage signal increases.

[0077] Step 5: Abnormal state adjustment. The growth state matching unit compares the current pressure signal with the current standard pressure range of the corresponding current voltage signal. If the current pressure signal is not within the range, the control system immediately controls the drive unit to reduce the soil loosening force and controls the timed start unit to extend the soil loosening interval. If the current pressure signal returns to the standard range, the soil loosening parameters of Step 4 are restored.

[0078] Step 6: Repeat steps 2-5 until the seedlings have completed their seedling growth cycle. Stop loosening the soil and transplant the tobacco seedlings after the seedling growth is complete.

[0079] It is understandable that traditional planting and seedling methods do not pay much attention to loosening the substrate during the seedling stage. This is because current technology generally considers tobacco seedlings to have delicate and fragile roots, and loosening the soil can easily lead to root breakage or damage, thereby inhibiting root absorption and affecting seedling growth. Therefore, the common practice is to either "not loosen the soil" or "only loosen it shallowly once before transplanting." Even when there is limited attention, it is only to loosen the substrate layer by loosening the soil at fixed intervals. However, this method cannot distinguish the difference in substrate compaction between the seedling stage and the mature seedling stage (the substrate compaction is slight in the seedling stage but the root system is weak, while the compaction is heavy in the mature seedling stage but the root system is strong). This often leads to excessive loosening of the soil in the seedling stage causing root damage, and insufficient loosening of the soil in the mature seedling stage causing substrate compaction and hypoxia. As a result, tobacco planting and seedling survival rates, seedling vigor, and poor growth uniformity are all problems.

[0080] The planting and seedling raising method provided in this embodiment, in conjunction with the aforementioned tobacco planting and seedling raising device, dynamically senses the growth status and matches the soil loosening strategy. This not only breaks the traditional perception that "loosening the soil will inevitably damage the roots," but also accurately meets the soil loosening needs at different growth stages. Ultimately, through the cyclical operation of the entire method, the soil loosening is always synchronized with the actual needs of the seedlings, achieving precise adaptation between substrate looseness and root development throughout the seedling raising cycle. This ensures the substrate looseness requirements of tobacco seedlings at different growth stages, significantly improves the seedling vigor rate and root development quality, and reduces the cost of manual intervention, providing efficient and stable technical support for large-scale tobacco seedling raising.

[0081] Example 3:

[0082] Based on the above embodiments, this embodiment provides a preferred implementation method, the difference being that: multiple storage slots are provided on the side wall of the water storage chamber 143 from top to bottom, and each of the multiple storage slots is provided with fertilizer granules for different growth stages of tobacco seedlings, wherein the uppermost storage slot contains fertilizer granules for the later stage of seedling growth, the middle storage slot contains fertilizer granules for the early stage of seedling growth, and the lowermost storage slot contains fertilizer granules for the seedling stage.

[0083] Because the seedlings are relatively light in weight and the seedling pot has a shallow water intake, the water level in the water storage chamber 143 is low, and the water level is at the bottom of the water storage chamber 143. Therefore, it contacts the lowest receiving trough and dissolves the fertilizer in the trough to form a seedling nutrient solution, which is then transported to the substrate layer via the water suction device 16 to facilitate the application of appropriate fertilizers and promote seedling growth. As the seedlings grow taller and heavier, the interlayer cavity 14 at the bottom of the seedling pot 1 gradually moves downward, allowing water from the water storage tray 2 to be continuously replenished to the water storage chamber 143 through the water inlet pipe. The water level rises slowly and synchronously with the growth height of the seedlings. Therefore, after the seedlings enter the early stage of seedling formation, the water level in the interlayer rises to the middle collection tank, where it mixes with the fertilizer to form a nutrient solution for the early stage of seedling formation. In the later stage of seedling formation, the water level reaches the uppermost collection tank, where the corresponding fertilizer dissolves to form a suitable nutrient solution for the later stage. This achieves dynamic adaptation of nutrient supply throughout the entire tobacco seedling cultivation process, avoiding the cumbersome and inaccurate problems of traditional manual staged fertilization. It ensures a high degree of matching between nutrient requirements and supply at each growth stage, significantly improving seedling efficiency and the robustness of seedling growth.

[0084] It should be noted that the electrical components involved in this embodiment, such as pressure sensor 139, linear Hall sensor 134 and power regulator, are all existing technologies. Their specific working principles and internal structures are not the subject of protection of this application. The implementation of related functions and effects can be obtained through existing technology channels. This application only utilizes their own functions to realize the linkage regulation of the tobacco planting and seedling raising process.

[0085] Furthermore, the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are all schematic diagrams, intended only to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0086] Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A tobacco planting and seedling raising device, the device comprising a water storage tray (2) and a plurality of seedling raising units arranged in an array on the water storage tray (2), characterized in that, The seedling raising unit includes a seedling raising module, a seedling guiding module, a soil loosening component, and a growth linkage regulation module; The seedling module is used for planting and cultivating tobacco seedlings; The seedling guidance module is located inside the seedling module and is used to guide the growth of the seedlings, and moves and rises synchronously as the seedlings grow. The soil loosening component is located within the substrate layer of the seedling module and is used to loosen the substrate. The growth linkage adjustment module includes a magnet (133), a linear Hall sensor (134), and a control system; wherein, The magnet (133) is fixed to the seedling guide module and moves synchronously with the seedling guide module; The linear Hall sensor (134) is fixed above the magnet (133) and is positioned opposite to the magnet (133) component. It is used to output a current voltage signal that increases with the height of the seedling. The control system is located on the seedling module and includes a threshold comparison unit, a timed start unit, and a drive unit. The threshold comparison unit is preset with a standard voltage signal corresponding to the seedling stage and is connected to the linear Hall sensor (134). When the threshold comparison unit receives the current voltage signal and determines that it is greater than the standard voltage signal, it controls the timed start unit to output a trigger signal to the drive unit at a preset interval. The drive unit is connected to the soil loosening component. After receiving the trigger signal, the drive unit controls the soil loosening component to perform timed soil loosening work according to the preset soil loosening time and basic soil loosening force. The basic soil loosening force gradually increases with the increase of the current voltage signal.

2. The tobacco planting and seedling raising device according to claim 1, characterized in that, The seedling module includes a seedling pot (1), and a partition (11) is provided in the middle of the seedling pot (1). The partition (11) is used to divide the lower part of the seedling pot (1) into a substrate chamber (12). The substrate chamber (12) is used to place the seedling substrate and form a substrate layer. The partition (11) has a through hole in the middle for the seedlings to pass through.

3. The tobacco planting and seedling raising device according to claim 2, characterized in that, The seedling guiding module includes a guide rod (131) and a follower ring (132). The guide rod (131) is vertically inserted into a partition (11) near the through hole, and its top end is connected to the linear Hall sensor (134). The follower ring (132) is located on the side of the guide rod (131) and directly above the through hole. The upper part of the follower ring (132) is connected to the magnet (133). The follower ring (132) and the guide rod (131) are slidably connected by a sliding mechanism. The sliding mechanism includes a groove (135), an anti-detachment plate (136), a slider (137), and a connecting rod. The groove (135) is opened along the axial direction of the guide rod (131) on its side, and the anti-detachment plates (136) are equidistantly distributed in the groove (135). 5) Inside, and one side of the anti-detachment plate (136) is connected to the bottom of the groove (135) through a rotating torsion spring. The slider (137) is slidably embedded in the groove (135) and connected to the follower ring (132) through a connecting rod. The rotating torsion spring is configured such that: in its natural state, the free end of the anti-detachment plate (136) is in an inclined extended state. When the slider (137) slides upward along the groove (135), it squeezes the free end of the anti-detachment plate (136), forcing the anti-detachment plate (136) to rotate around the rotating torsion spring toward the bottom of the groove (135) so as to allow the slider (137) to pass through; when the slider (137) is subjected to a downward force, the lower surface of the slider (137) contacts the inclined surface of the anti-detachment plate (136) and forms a snap-fit, preventing the slider (137) from sliding down.

4. The tobacco planting and seedling raising device according to claim 3, characterized in that, The follower ring (132) is also provided with several flexible clamping rings (138). The outer wall of the flexible clamping ring (138) is flexibly clamped to the stem of the seedling through an arc-shaped protrusion. A pressure sensor (139) connected to the control system signal is also attached inside the flexible clamping ring (138). The pressure sensor (139) is used to collect the current pressure signal generated by the flexible clamping ring (138) being squeezed by the stem. The current pressure signal increases as the stem thickness increases.

5. A tobacco planting and seedling raising device according to claim 4, characterized in that, The control system also includes a growth state matching unit, which has a preset current standard pressure range that increases in a stepwise manner as the current voltage signal increases. When the growth state matching unit determines that the current pressure signal collected by the pressure sensor (139) is not within the current standard pressure range, it controls the drive unit to reduce the soil loosening force of the soil loosening component and controls the timed start unit to extend the soil loosening interval.

6. A tobacco planting and seedling raising device according to claim 2, characterized in that, A double-layered cavity (14) is provided at the bottom of the seedling pot (1). A sealing plate (141) is provided above the interior of the double-layered cavity (14). The sealing plate (141) divides the double-layered cavity (14) into an installation cavity (142) and a water storage cavity (143) from top to bottom. The installation cavity (142) is used to install the drive unit. The water storage cavity (143) is connected to the water storage tray (2) through a water inlet pipe to store the water required for seedling growth. The water storage cavity (143) is connected to the substrate chamber (12) through a water absorption element (16).

7. A tobacco planting and seedling raising device according to claim 5, characterized in that, The drive unit includes a drive motor (151), the output end of which passes through the bottom of the seedling pot (1) and is connected to the soil loosening component. The drive motor (151) is equipped with a driver that is electrically connected to the control system. The driver is equipped with a power regulator. The power regulator adjusts the output power of the drive motor (151) to adjust the soil loosening force of the soil loosening component.

8. A tobacco planting and seedling raising device according to claim 7, characterized in that, The soil loosening assembly includes a horizontal shaft (152) and a soil loosening shaft (153). The horizontal shaft (152) is horizontally positioned inside the substrate chamber (12) and connected to the output end of the drive motor (151). The soil loosening shaft (153) is rotatably sleeved on both ends of the horizontal shaft (152). Multiple soil loosening protrusions (154) are staggered on the outside of the soil loosening shaft (153). The ends of the soil loosening shaft (153) that are far apart from each other are connected to the side wall of the substrate chamber (12) through a rotating mechanism. The rotating mechanism includes a toothed groove (155) that is opened around the side wall of the substrate chamber (12), and a gear (156) that is embedded in the toothed groove (155) and meshes with it. The side of the gear (156) facing the opening of the toothed groove (155) is connected to the end of the soil loosening shaft (153). A baffle brush is also provided at the opening of the toothed groove (155).

9. A method for tobacco planting and seedling raising, comprising a tobacco planting and seedling raising device according to any one of claims 1-8, characterized in that, The method includes: Step 1: Seedling preparation. Fill the substrate chamber (12) of the seedling module with the seedling substrate to form a substrate layer. Plant the tobacco seedlings into the substrate layer and let the stems pass through the through holes of the partition (11). The base of the stems is held by the flexible clamping ring (138) of the seedling guide module so that the initial position of the follow-up ring (132) matches the height of the seedlings. At the same time, the water storage chamber (143) establishes a water connection with the substrate layer through the water absorption device (16). Step 2: Growth signal monitoring. During the seedling growth process, the follower ring (132) slides upward along the guide rod (131) as the stem rises, driving the magnet (133) to move synchronously. The linear Hall sensor (134) collects the current voltage signal that increases with the height of the seedling in real time and transmits it to the control system. At the same time, the pressure sensor (139) collects the current pressure signal of the flexible clamping ring (138) under the pressure of the stem in real time and transmits it to the growth status matching unit. Step 3: Soil loosening start judgment. The threshold comparison unit of the control system compares the current voltage signal with the standard voltage signal. When the current voltage signal is greater than the standard voltage signal, it is determined that the seedling has entered the non-seedling stage, and the timed start unit is triggered to output the soil loosening trigger signal to the drive unit at a preset interval. Step 4: Foundation loosening control. After receiving the trigger signal, the drive unit controls the loosening component to start the loosening operation for a preset time. The power regulator adjusts the output power of the drive motor (151) in real time according to the current voltage signal, so that the foundation loosening force gradually increases as the current voltage signal increases. Step 5: Abnormal state adjustment. The growth state matching unit compares the current pressure signal with the current standard pressure range of the corresponding current voltage signal. If the current pressure signal is not within the range, the control system immediately controls the drive unit to reduce the soil loosening force and controls the timed start unit to extend the soil loosening interval. If the current pressure signal returns to the standard range, the soil loosening parameters of Step 4 are restored. Step 6: Repeat steps 2-5 until the seedlings have completed their seedling growth cycle. Stop loosening the soil and transplant the tobacco seedlings after the seedling growth is complete.

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