Traditional Chinese medicine seedling cultivation device

Abstract

This invention discloses a device for cultivating Chinese medicinal herb seedlings, relating to the field of Chinese medicinal herb cultivation technology. It includes: a box, a planting tray, an upper air duct, a lower air duct, a semiconductor cooling device, and a ventilation device. A partition is horizontally arranged inside the box, with a lighting device connected to the lower end of the partition. A main heat sink for cooling the lighting device is connected to the upper end of the partition, and the upper end of the partition forms a heat dissipation cavity with the inner wall of the box. Ventilation holes are provided on the partition. The planting tray is used to store soil and seedlings and is placed at the bottom of the box. The upper air duct communicates with the heat dissipation cavity. The lower air duct is connected to the lower end of the rear wall of the box and communicates with the space below the partition. The semiconductor cooling device is installed in the upper and lower air ducts to transfer heat from the air in the lower air duct to the air in the upper air duct. The ventilation device has a first state of only supplying air into the upper air duct and a second state of only supplying air into the lower air duct. This invention can provide suitable temperature and light for the seedlings.

Description

Technical Field

[0001] This invention relates to the field of Chinese medicinal herb cultivation technology, and in particular to a Chinese medicinal herb seedling cultivation device. Background Technology

[0002] Traditional Chinese medicine (TCM) refers to drugs that are collected, processed, and prepared according to the principles of traditional Chinese medicine, with explained mechanisms of action, and used to guide clinical applications. These drugs mainly include plant-based, animal-based, and mineral-based medicines. TCM herbs belong to the plant-based category and have exceptionally high medicinal value. Wild TCM herbs are scarce and expensive, therefore, artificial cultivation is used to increase yield. Thus, seedling cultivation is a crucial step in the cultivation of TCM herbs. In TCM herb cultivation, seedling quality directly affects the yield, quality, and economic benefits. Currently, TCM herb seedling cultivation is primarily conducted in greenhouses or fields. These methods are highly susceptible to environmental factors, and since some TCM herbs have demanding requirements for seedling conditions, low seedling survival rates, small growth rates, and poor quality are common. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a device for cultivating Chinese medicinal herb seedlings, which can provide suitable temperature and light for the seedlings.

[0004] According to a first aspect of the present invention, a medicinal herb seedling cultivation device includes: a box, a planting tray, an upper air duct, a lower air duct, a semiconductor cooling device, and a ventilation device. A partition is horizontally arranged inside the box. A lighting device is connected to the lower end of the partition, and a main heat sink for cooling the lighting device is connected to the upper end of the partition. The upper end of the partition forms a heat dissipation cavity with the inner wall of the box, and ventilation holes are provided on the partition. The planting tray is used to store soil and seedlings and is placed at the bottom of the box. The upper air duct is connected to the upper end of the rear wall of the box and communicates with the heat dissipation cavity. The lower air duct is connected to the lower end of the rear wall of the box and communicates with the space below the partition. The semiconductor cooling device is installed in the upper and lower air ducts to transfer heat from the air in the lower air duct to the air in the upper air duct. The ventilation device has a first state of only sending air into the upper air duct and a second state of only sending air into the lower air duct.

[0005] According to some embodiments of the present invention, the planting tray is provided with a handle on its edge to facilitate the removal and placement of the planting tray.

[0006] According to some embodiments of the present invention, the lighting device consists of a plurality of spaced LED light strips, which are bolted to the partition plate, and the partition plate is used to transfer the heat generated by the lighting device to the main heat sink.

[0007] According to some embodiments of the present invention, the lower air duct is connected to the lower right corner of the rear wall of the housing, and the ventilation hole is opened at the front left corner of the partition.

[0008] According to some embodiments of the present invention, a temperature sensor is disposed at the center of the interior of the enclosure.

[0009] According to some embodiments of the present invention, a first temperature and humidity sensor is provided in the ventilation hole, and a second temperature and humidity sensor is provided at the opening where the housing communicates with the lower air duct.

[0010] According to some embodiments of the present invention, the semiconductor cooling device includes a cooling semiconductor, an upper heat sink, and a lower heat sink. The upper heat sink is connected to the upper end of the cooling semiconductor, and the lower heat sink is connected to the lower end of the cooling semiconductor. The upper heat sink is located inside the upper air duct, and the lower heat sink is located inside the lower air duct.

[0011] According to some embodiments of the present invention, the ventilation device includes an inner pipe, an outer pipe, and a motor. A first intermediate plate is provided in the inner pipe to divide it into an upper flow channel and a lower flow channel. The inner pipe is connected to both the lower air duct and the upper air duct. The upper flow channel communicates with the upper air duct, and the lower flow channel communicates with the lower air duct. The outer pipe is sleeved on the inner pipe. A second intermediate plate is provided in the outer pipe to divide it into an inlet flow channel and an outlet flow channel. A blower is installed in the inlet flow channel. When the ventilation device is in a first state, the upper flow channel is aligned with the inlet flow channel, and the lower flow channel is aligned with the outlet flow channel. When the ventilation device is in a second state, the upper flow channel is aligned with the outlet flow channel, and the lower flow channel is aligned with the inlet flow channel. The motor is connected to the side wall of the upper air duct, and the motor drives the outer pipe to rotate to switch between the first and second states.

[0012] According to some embodiments of the present invention, a driven gear ring is provided around the side wall of the outer tube, and a driving gear meshing with the driven gear ring is connected to the output shaft of the motor.

[0013] According to some embodiments of the present invention, a door is provided at the front of the box to facilitate the removal and placement of the planting tray.

[0014] A medicinal herb seedling cultivation device according to an embodiment of the present invention has at least the following beneficial effects:

[0015] (1) The cooling and heating are completed by semiconductor refrigeration and the switching between cooling and heating is completed by ventilation device. The lighting device provides light and also provides some heating capacity. The temperature control is stable and the energy consumption is low.

[0016] (2) The ventilation device has a simple structure and a low failure rate;

[0017] (3) Set up multiple temperature and humidity sensors to monitor the environment of the enclosure.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of an installation structure according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of a lighting device according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a ventilation device according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of one embodiment of the present invention;

[0025] Figure 6 For Figure 5 Enlarged view of point B in the middle.

[0026] Icon labels:

[0027] Box body 100, heat dissipation cavity 101, box door 102, partition 110, ventilation hole 111, main heat sink 120, drip irrigation pipe 130, peristaltic pump 140;

[0028] lighting device 200;

[0029] Planting tray 300, handle 310;

[0030] Upward duct 400;

[0031] Downdraft duct 500;

[0032] Semiconductor cooling device 600, cooling semiconductor 610, upper heat sink 620, lower heat sink 630;

[0033] Ventilation device 700, driven gear ring 701, driving gear 702, inner tube 710, first intermediate plate 711, upper flow channel 712, lower flow channel 713, outer tube 720, second intermediate plate 721, air inlet flow channel 722, air outlet flow channel 723, blower 724, motor 730, air outlet 740;

[0034] Temperature sensor 800;

[0035] First temperature and humidity sensor 900, second temperature and humidity sensor 910. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0038] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0039] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0040] Reference Figures 1 to 6As shown, an embodiment of the present invention provides a medicinal herb seedling cultivation device, comprising: a box 100, a planting tray 300, an upper air duct 400, a lower air duct 500, a semiconductor cooling device 600, and a ventilation device 700. The box 100 is hollow inside. To save costs, the box 100 can be welded from ordinary steel plates. A partition 110 is horizontally welded inside the box 100, the size of which matches the cross-sectional size of the box 100. A lighting device 200 is connected to the lower end of the partition 110, providing the medicinal herb seedlings with the necessary light for growth. A main heat sink 120 is connected to the upper end of the partition 110 to cool the lighting device 200. Since the lighting device 200 inevitably generates heat when converting electrical energy into light energy, the main heat sink 120 cools the lighting device 200 to prevent the temperature from rising to the point of affecting its normal operation. The upper end of the partition 110 forms a heat dissipation cavity 101 with the inner wall of the box 100. It is foreseeable that a thin steel plate will be welded to the partition 110 to form a sealed structure for the heat dissipation cavity 101. Ventilation holes 111 are provided on the partition 110. The planting tray 300 is used to store soil and seedlings. The size of the planting tray 300 is slightly smaller than the internal size of the box 100 so that the planting tray 300 can be placed inside the box 100. The planting tray 300 can be made of plastic or stainless steel. A soil moisture sensor is provided in the planting tray 300 to detect soil moisture. A planting tray 300 is placed at the bottom of the box 100; an upper air duct 400 is connected to the upper end of the rear wall of the box 100, and the upper air duct 400 communicates with the heat dissipation cavity 101; a lower air duct 500 is connected to the lower end of the rear wall of the box 100, and the lower air duct 500 communicates with the space below the partition 110; a semiconductor cooling device 600 is installed in the upper air duct 400 and the lower air duct 500 to transfer the heat of the air in the lower air duct 500 to the air in the upper air duct 400; a ventilation device 700 has a first state of only sending air into the upper air duct 400 and a second state of only sending air into the lower air duct 500. The ventilation device 700 is always kept open to allow the air inside the box 100 to circulate with the outside, so as to ensure the supply of oxygen and carbon dioxide for the seedlings to grow normally. When the temperature of the enclosure 100 is low, the ventilation device 700 switches to the first state, sending air into the upper air duct 400. The upper air duct 400 delivers the air to the heat dissipation cavity 101, carrying away the heat from the main heat sink 120 to cool the lighting device 200. After being heated in the heat dissipation cavity 101, the air enters the enclosure 100 through the ventilation hole 111. Since hot air has a lower density, it accumulates at the top of the internal space of the enclosure 100, while cold air has a higher density and accumulates at the bottom of the internal space of the enclosure 100. Therefore, the cold air can be quickly discharged from the lower air duct 500, effectively raising the internal temperature of the enclosure 100 rapidly.When the heat emitted by the lighting device 200 is insufficient to maintain the internal temperature of the box 100 above the minimum temperature required for seedling growth, the semiconductor cooling device 600 is activated. This transfers heat from the air in the lower air duct 500 to the upper air duct 400. The air is heated as it passes through the upper air duct 400 before entering the heat dissipation chamber 101, further increasing the temperature inside the box 100. The temperature inside the box 100 can be controlled by adjusting the power of the semiconductor cooling device 600. Using the semiconductor cooling device 600 effectively reduces energy consumption compared to using heating wires. When the temperature inside the enclosure 100 is too high, the ventilation device 700 switches to its second state, sending air into the lower duct 500 and activating the semiconductor cooling device 600. This transfers heat from the air in the lower duct 500 to the upper duct 400. The air is cooled as it passes through the lower duct 500 before entering the enclosure 100. Because hot air has a lower density, it accumulates at the top of the internal space of the enclosure 100, while cold air has a higher density and accumulates at the bottom. Therefore, the hot air can be quickly discharged from the ventilation hole 111 into the heat dissipation cavity 101, then cools the lighting device 200 before being discharged from the upper duct 400. At this time, by controlling the power of the semiconductor cooling device 600, the temperature inside the enclosure 100 can be controlled.

[0041] Reference Figures 1 to 6 As shown, it is understood that the planting tray 300 is provided with a handle 310 on its edge, and the handle 310 can be connected to the planting tray 300 by bolts. The handle 310 is provided for the operator to grip, so as to easily take out and put in the planting tray 300.

[0042] Reference Figures 1 to 6 As shown, the lighting device 200 consists of multiple spaced LED strips, with at least five strips, to ensure uniform lighting within the enclosure 100 and increase the area of ​​the seedlings exposed to light. The LED strips are bolted to the partition 110, and thermally conductive adhesive can be filled between the LED strips and the partition 110 to quickly transfer heat generated by the LED strips to the partition 110. The partition 110 is cut from a 3mm thick steel plate. The partition 110 transfers heat generated by the lighting device 200 to the main heat sink 120. The main heat sink 120 is composed of multiple slotted aluminum fins, and its height is 5mm less than the internal height of the heat dissipation cavity 101 to facilitate installation. It is anticipated that thermally conductive adhesive will also be filled between the main heat sink 120 and the partition 110.

[0043] Reference Figures 1 to 6As shown, it can be understood that the lower air duct 500 is connected to the lower right corner of the rear wall of the box 100, and the ventilation hole 111 is opened at the front left corner of the partition 110. This allows the air to travel as far as possible within the box 100, ensuring that each seedling receives adequate ventilation and improving its growth rate.

[0044] Reference Figures 1 to 6 As shown, it can be understood that a temperature sensor 800 is located at the center of the interior of the enclosure 100. Placing the temperature sensor 800 at the center of the enclosure 100 can accurately reflect the internal temperature of the enclosure 100 and reduce temperature measurement deviation.

[0045] Reference Figures 1 to 6 As shown, a first temperature and humidity sensor 900 is installed in the ventilation hole 111, and a second temperature and humidity sensor 910 is installed at the opening connecting the housing 100 and the lower duct 500. The absolute humidity of the air passing through the ventilation hole can be obtained from the measurement results of the first temperature and humidity sensor 900, and the absolute humidity of the air passing through the lower duct 500 can be obtained from the measurement results of the second temperature and humidity sensor 910. When the airflow through the housing 100 is constant, the moisture lost by the soil and seedlings inside the housing 100 can be calculated using the first and second temperature and humidity sensors 900 and 910, allowing for precise water replenishment and maintaining constant soil moisture. It is foreseeable that installing a wind speed and airflow meter inside the lower duct 500 can accurately measure the airflow through the housing 100.

[0046] Reference Figures 1 to 6 As shown, the semiconductor cooling device 600 includes a cooling semiconductor 610, an upper heat sink 620, and a lower heat sink 630. The upper heat sink 620 is connected to the upper end of the cooling semiconductor 610, and the lower heat sink 630 is connected to the lower end of the cooling semiconductor 610. The upper heat sink 620 is located inside the upper air duct 400, and the lower heat sink 630 is located inside the lower air duct 500. The specific structure of the cooling semiconductor 610 is prior art and will not be described in detail. The upper heat sink 620 and the lower heat sink 630 are fixed to the upper and lower ends of the cooling semiconductor 610 respectively by thermally conductive adhesive. When the cooling semiconductor 610 is energized, it can transfer the heat from the lower side of the cooling semiconductor 610 to the upper side, and then heat the air flowing through the upper air duct 400 through the upper heat sink 620 and the air flowing through the lower air duct 500 through the lower heat sink 630.

[0047] Reference Figures 1 to 6As shown, the ventilation device 700 includes an inner pipe 710, an outer pipe 720, and a motor 730. Both the inner pipe 710 and the outer pipe 720 are horizontally arranged. A first intermediate plate 711 is provided in the inner pipe 710 to divide it into an upper flow channel 712 and a lower flow channel 713. It is foreseeable that the first intermediate plate 711 divides the inner pipe 710 into the upper flow channel 712 and the lower flow channel 713 along the radial direction of the inner pipe 710. The inner pipe 710 is connected to both the lower air duct 500 and the upper air duct 400. The lower air duct 500 and the upper air duct 400 are rectangular. A portion of one end of the inner pipe 710 is welded to the lower air duct 500, and the other portion is welded to the upper air duct 400. The upper flow channel 712 communicates with the upper air duct 400, and the lower flow channel 713 communicates with the lower air duct 500. The outer pipe 720 is sleeved on the inner pipe 710 and can rotate around its own axis. A second intermediate plate 721 is provided in the outer tube 720 to divide the outer tube 720 into an air inlet channel 722 and an air outlet channel 723. Predictably, the second intermediate plate 721 divides the outer tube 720 into the air inlet channel 722 and the air outlet channel 723 radially. A blower 724 is installed in the air inlet channel 722. When the ventilation device 700 is in the first state, the upper channel 712 is aligned with the air inlet channel 722, and the lower channel 713 is aligned with the air outlet channel 723. When the ventilation device 700 is in the second state, the upper channel 712 is aligned with the air outlet channel 723, and the lower channel 713 is aligned with the air inlet channel 722. A motor 730 is bolted to the side wall of the upper air duct 400. The motor 730 drives the outer tube 720 to rotate to switch between the first and second states. The motor 730 is a servo motor to precisely control the rotation angle of the outer tube 720. An air outlet 740 communicating with the air outlet 723 is provided on the side wall of the outer tube 720. The end of the air outlet 723 away from the inner tube 710 is sealed to prevent the air discharged from the air outlet 723 from being re-inhaled into the air inlet 722 due to its proximity to the blower 724. This ensures that the air inside the box 100 is effectively renewed and that the carbon dioxide and oxygen content in the air inside the box 100 remains normal.

[0048] Reference Figures 1 to 6 As shown, it can be understood that a driven gear ring 701 is arranged around the side wall of the outer tube 720, and a driving gear 702 meshing with the driven gear ring 701 is connected to the output shaft of the motor 730. The gear transmission structure is simple. It is foreseeable that two baffles are welded around the side wall of the outer tube 720, and the driving gear 702 is partially embedded between the two baffles to axially limit the outer tube 720. Since the outer tube 720 does not generate a torque for axial movement during rotation, the axial force on the driving gear 702 is very small, sufficient to prevent the outer tube 720 from axially moving away from the inner tube 710.

[0049] Reference Figures 1 to 6As shown, it can be understood that a door 102 is provided at the front of the box 100 to facilitate the removal and placement of the planting tray 300. The left side of the door 102 is hinged to the box 100, and a transparent observation window is provided on the door 102 to facilitate the observation of the seedling growth.

[0050] Reference Figures 1 to 6 As shown, it can be understood that a drip irrigation pipe 130 is installed through the side wall of the box 100, and a peristaltic pump 140 is connected to the drip irrigation pipe 130. One end of the drip irrigation pipe 130 extending outside the box 100 is connected to a water container. The peristaltic pump 140 is used to transport water from the water container to the planting tray 300. The peristaltic pump 140 is electrically connected to the controller, which reads the values ​​from the first temperature and humidity sensor 900 and the second temperature and humidity sensor 910. The amount of water evaporating from the box 100 can be calculated from the difference between the values ​​of the first temperature and humidity sensor 900 and the second temperature and humidity sensor 910, and the airflow through the box 100. When the power of the blower 724 is the same, the airflow through the box 100 remains constant, so the airflow through the box 100 can be obtained through actual measurement. Then, the controller controls the flow rate of the peristaltic pump 140 so that the flow rate of water through the peristaltic pump 140 is equal to the amount of water evaporating from the box 100, thus achieving the purpose of water conservation. The advantage of using peristaltic pump 140 is that it allows for more precise control of the water flow rate through the peristaltic pump 140.

[0051] Working principle: Seedlings and soil are placed together in the container 100. The lighting device 200 is turned on, and the ventilation device 700 remains on to ensure air circulation between the container 100 and the outside environment, guaranteeing the supply of oxygen and carbon dioxide for normal seedling growth. When the temperature sensor 800 detects that the temperature of the container 100 is lower than the minimum temperature required for seedling growth, the ventilation device 700 switches to its first state, sending air into the upper air duct 400. The upper air duct 400 delivers the air to the heat dissipation cavity 101, carrying away heat from the main heat sink 120 to cool the lighting device 200. After being heated in the heat dissipation cavity 101, the air enters the container 100 through the ventilation hole 111. Because hot air has a lower density, it accumulates at the top of the internal space of the container 100, while cold air has a higher density and accumulates at the bottom. Therefore, the cold air can be quickly discharged from the lower air duct 500, effectively raising the internal temperature of the container 100 rapidly. When the heat emitted by the lighting device 200 is insufficient to maintain the internal temperature of the box 100 above the minimum temperature required for seedling growth, the semiconductor cooling device 600 is activated. This transfers heat from the air in the lower air duct 500 to the upper air duct 400. The air is heated as it passes through the upper air duct 400 before entering the heat dissipation chamber 101, further increasing the temperature inside the box 100. The temperature inside the box 100 can be controlled by adjusting the power of the semiconductor cooling device 600. Using the semiconductor cooling device 600 effectively reduces energy consumption compared to using heating wires. When the temperature sensor 800 detects that the temperature of the chamber 100 exceeds the maximum temperature required for seedling growth, the ventilation device 700 switches to its second state, sending air into the lower duct 500 and activating the semiconductor cooling device 600. This transfers heat from the air in the lower duct 500 to the upper duct 400. The air is cooled as it passes through the lower duct 500 before entering the chamber 100. Because hot air has a lower density, it accumulates at the top of the internal space of the chamber 100, while cold air has a higher density and accumulates at the bottom. Therefore, the hot air can be quickly discharged from the ventilation hole 111 into the heat dissipation cavity 101, then cools the lighting device 200 before being discharged from the upper duct 400. At this time, by controlling the power of the semiconductor cooling device 600, the temperature inside the chamber 100 can be controlled. The controller reads the values ​​from the first temperature and humidity sensor 900 and the second temperature and humidity sensor 910, and calculates the amount of moisture evaporation in the chamber 100. The controller then controls the flow rate of the peristaltic pump 140 so that the flow rate of water through the peristaltic pump 140 is equal to the amount of water evaporated from the tank 100. When the soil humidity sensor detects that the soil humidity is lower than the minimum humidity required for seedling growth, the controller increases the flow rate of the peristaltic pump 140; when the soil humidity sensor detects that the soil humidity is higher than the maximum humidity required for seedling growth, the controller decreases the flow rate of the peristaltic pump 140.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for cultivating seedlings of traditional Chinese medicinal materials, characterized in that, include: The enclosure (100) has a horizontal partition (110) inside. The lower end of the partition (110) is connected to a lighting device (200), and the upper end of the partition (110) is connected to a main heat sink (120) for cooling the lighting device (200). The upper end of the partition (110) forms a heat dissipation cavity (101) with the inner wall of the enclosure (100). Ventilation holes (111) are provided on the partition (110). A planting tray (300) for storing soil and seedlings is placed at the bottom of the box (100); An upper air duct (400) is connected to the upper end of the rear wall of the housing (100), and the upper air duct (400) is connected to the heat dissipation cavity (101); A downdraft duct (500) is connected to the lower end of the rear wall of the housing (100), and the downdraft duct (500) communicates with the space below the partition (110); A semiconductor cooling device (600) includes a cooling semiconductor (610), an upper heat sink (620), and a lower heat sink (630). The upper heat sink (620) is connected to the upper end of the cooling semiconductor (610), and the lower heat sink (630) is connected to the lower end of the cooling semiconductor (610). The upper heat sink (620) is located inside the upper air duct (400), and the lower heat sink (630) is located inside the lower air duct (500). The semiconductor cooling device (600) is used to transfer the heat of the air in the lower air duct (500) to the air in the upper air duct (400). A ventilation device (700) includes an inner pipe (710), an outer pipe (720), and a motor (730). The inner pipe (710) has a first intermediate plate (711) dividing it into an upper flow channel (712) and a lower flow channel (713). The inner pipe (710) is connected to both the lower air duct (500) and the upper air duct (400). The upper flow channel (712) communicates with the upper air duct (400), and the lower flow channel (713) communicates with the lower air duct (500). The outer pipe (720) is fitted onto the inner pipe (710), and a second intermediate plate (721) is provided within the outer pipe (720) to divide it into an inlet and outlet. The air inlet duct (722) and the air outlet duct (723) are provided. A blower (724) is installed in the air inlet duct (722). When the ventilation device (700) is in the first state, the upper duct (712) is aligned with the air inlet duct (722) and the lower duct (713) is aligned with the air outlet duct (723). When the ventilation device (700) is in the second state, the upper duct (712) is aligned with the air outlet duct (723) and the lower duct (713) is aligned with the air inlet duct (722). The motor (730) is connected to the side wall of the upper air duct (400). The motor (730) drives the outer tube (720) to rotate to switch between the first state and the second state. The semiconductor cooling device (600) and the ventilation device (700) are configured such that when heating is required, the ventilation device (700) switches to a first state, and outside air enters the upper air duct (400) through the air inlet channel (722) and the upper air outlet channel (712). The upper air duct (400) delivers the air to the heat dissipation cavity (101) to remove the heat from the main heat sink (120). After absorbing the heat from the main heat sink (120), the air enters the housing through the ventilation hole (111). (100) Inside; When cooling is required, the ventilation device (700) is in the second state. Outside air enters the lower air duct (500) through the air inlet channel (722) and the lower flow channel (713), and enters the interior of the box (100) after being cooled by the lower heat sink (630). The hot air inside the box (100) is discharged through the ventilation hole (111), the heat dissipation cavity (101), the upper air duct (400), the upper flow channel (712), and the air outlet channel (723).

2. The medicinal herb seedling cultivation device according to claim 1, characterized in that: The planting tray (300) is provided with a handle (310) on its edge to facilitate the removal and placement of the planting tray (300).

3. The medicinal herb seedling cultivation device according to claim 2, characterized in that: The lighting device (200) consists of multiple spaced LED light strips, which are bolted to the partition (110). The partition (110) is used to transfer the heat generated by the lighting device (200) to the main heat sink (120).

4. The medicinal herb seedling cultivation device according to claim 3, characterized in that: The lower air duct (500) is connected to the lower right corner of the rear wall of the box (100), and the ventilation hole (111) is opened at the front left corner of the partition (110).

5. The medicinal herb seedling cultivation device according to claim 4, characterized in that: A temperature sensor (800) is installed at the center of the interior of the enclosure (100).

6. The medicinal herb seedling cultivation device according to claim 5, characterized in that: A first temperature and humidity sensor (900) is installed in the ventilation hole (111), and a second temperature and humidity sensor (910) is installed at the opening where the box (100) connects to the lower air duct (500).

7. The medicinal herb seedling cultivation device according to claim 6, characterized in that: The outer tube (720) is surrounded by a driven gear ring (701) on its side wall, and the output shaft of the motor (730) is connected to a drive gear (702) that meshes with the driven gear ring (701).

8. The medicinal herb seedling cultivation device according to claim 7, characterized in that: The box (100) is provided with a door (102) at the front to facilitate the removal and placement of the planting tray (300).

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