High-temperature sterilization device for seedling raising substrate

Abstract

The utility model discloses a high temperature sterilization device for seedling substrate relates to seedling substrate technical field, including bearing frame, protective cover, distributing hopper, screening grid and microwave transmitter, the pretreatment mechanism is provided with on bearing frame top, the pretreatment mechanism includes distributing hopper, screening grid, spray pipeline and transducer, the transducer sets up in distributing hopper side, the screening grid sets up in distributing hopper, the spray pipeline is installed in distributing hopper top, six even distribution's microwave transmitter forms global radiation field, and the spiral conveying petal of collocation cylinder inner wall lets the substrate fully overturn in the conveying process, ensures each area even heat, thoroughly solves the problem of partial sterilization not thoroughly, the meshing drive of double drive shaft and gear ring can accurate control the rotating speed of cylinder, adapts the substrate sterilization demand of different humidity, particle size, improves the versatility of equipment.

Description

Technical Field

[0001] This utility model relates to the field of seedling substrate technology, specifically a high-temperature sterilization device for seedling substrate. Background Technology

[0002] As the core carrier for the growth of seedlings of vegetables, fruits, medicinal herbs, and flowers, the hygiene quality of the seedling substrate directly determines the survival rate, growth status, and subsequent yield and quality of these four types of crops. In vegetable seedling cultivation (such as tomatoes and cabbage), residual damping-off pathogens and root rot pathogens in the substrate can easily lead to root rot in seedlings. In fruit seedling cultivation (such as strawberries and figs), insect eggs (such as root-knot nematode eggs) can cause root malformation in seedlings, affecting nutrient absorption. Medicinal herb seedling cultivation (such as fritillaria and epimedium) requires extremely high substrate purity; the germination of weed seeds can interfere with the growth of seedlings. Seedlings compete for nutrients, leading to weak growth and insufficient accumulation of active ingredients in medicinal herbs. In flower seedling cultivation (such as roses and crabapples), leaf spot disease is easily caused by mold in the substrate, reducing ornamental value. It can be seen that pathogens, insect eggs, weed seeds and other harmful organisms in the substrate are key factors that induce seedling diseases in these four types of crops and cause weak seedling growth. Therefore, the substrates used for vegetable, fruit, medicinal herb and flower seedling cultivation must undergo strict sterilization treatment before being put into use to ensure the stable progress of the seedling process of various crops and lay a solid foundation for subsequent growth. While current seedling substrate sterilization equipment on the market can achieve basic sterilization functions, it has obvious shortcomings in practical applications and is difficult to meet the needs of large-scale and efficient seedling production of vegetables, fruits, medicinal materials, and flowers. Taking the "Intelligent Disinfection Device for Seedling Substrate" with application number CN202310560698.1 as an example, this device carries a water supply device and a steam generator through a walking device. It uses a switching device to deliver steam to a steam release device pre-embedded in the substrate pile and uses a heat preservation device to lock in the temperature. At the same time, it uses a moisture and temperature measuring instrument to monitor the substrate status in real time and feeds the temperature and humidity data back to the controller to regulate the operation of the steam generator. Although it has achieved intelligent control of the sterilization process, it still has core technology limitations and insufficient adaptability to the seedling production of four types of crops. Steam needs to heat the substrate through contact penetration, resulting in slow heating of the deeper layers of the substrate. For fine-particle substrates used in vegetable seedling cultivation (such as peat moss-based formulations), steam penetration resistance is high, requiring an additional extended time for deep sterilization. Coconut coir substrate, commonly used in fruit seedling cultivation, has strong water retention, making it difficult for steam to penetrate quickly, significantly prolonging the sterilization cycle. Medicinal herb seedling cultivation has stringent requirements for thorough substrate sterilization; slow heating of the deeper layers can easily lead to inadequate local sterilization, increasing the risk of later diseases. Flower seedling cultivation is mostly a small-scale, meticulous operation; an excessively long sterilization cycle reduces seedling turnover efficiency and is difficult to match the time-sensitive needs of flower seedling cultivation. Damage to the insulation device will further exacerbate heat loss. Large-scale vegetable and fruit seedling cultivation requires the processing of large amounts of substrate, and heat loss will lead to repeated heating, increasing energy consumption and production costs. The substrate for medicinal herb seedling cultivation often contains valuable organic matter, and excessive heating can easily damage the nutrient structure. Heat loss forces the equipment to operate at high temperatures continuously, exacerbating nutrient depletion. Flower seedling cultivation is highly sensitive to costs, and additional energy consumption will increase seedling costs and reduce market competitiveness. In summary, this type of equipment is difficult to adapt to the diverse needs of efficient seedling production of vegetables, fruits, medicinal herbs, and flowers. Based on this, this solution proposes "a high-temperature sterilization device for seedling substrate" to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a high-temperature sterilization device for seedling substrates, in order to solve the problem of slow deep heating of substrates in existing market equipment mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature sterilization device for seedling substrate, comprising a support frame, a protective cover, a distributing hopper, a sieve grid, and a microwave transmitter; A pretreatment mechanism is provided above the support frame. The pretreatment mechanism includes a distribution hopper, a screening grid, a spray pipe and a transducer. The transducer is located on the side of the distribution hopper, the screening grid is located inside the distribution hopper and the spray pipe is installed on the top of the distribution hopper.

[0005] As a preferred technical solution of this utility model, a guide rail groove is opened on the side of the support frame, the support part of the guide rail groove is an L-shaped structure, a protective cover is slidably connected above the guide rail groove, and the protective cover is fixed to the right side of the guide rail groove by bolts; Using the above technical solution, a guide rail groove is opened on the side of the support frame. The L-shaped support structure can provide stable support for the protective cover, ensuring the structural stability of the protective cover after installation. It can also achieve convenient opening and closing of the protective cover through sliding connection. During equipment maintenance or internal cleaning, there is no need to disassemble the whole thing. It can be operated by sliding open, which greatly improves maintenance efficiency. At the same time, the design of fixing the protective cover with bolts on the right side of the guide rail groove can lock the protective cover when the equipment is working, preventing the protective cover from loosening due to equipment vibration. This not only ensures the safety of operators, but also reduces the leakage of high temperature and microwaves inside the drum, reduces energy loss, and indirectly improves sterilization efficiency.

[0006] As a preferred technical solution of this utility model, the drying bracket is fixed to the inner side of the upper part of the support frame with bolts, and the microwave transmitter is fixed to the center line of the drying bracket with bolts. There are six microwave transmitters evenly distributed in total. Using the above technical solution, the drying bracket is fixed to the inner side of the upper part of the support frame with bolts. This not only facilitates the installation and disassembly of the drying bracket and provides convenience for the subsequent maintenance and replacement of the microwave transmitter, but also provides a stable installation foundation for the microwave transmitter, preventing the microwave transmitter from shaking during equipment operation. The six evenly distributed microwave transmitters are set along the center line of the drying bracket, which can form a microwave radiation field that covers the entire area. This allows all areas of the seedling substrate in the drum to receive microwave energy evenly, effectively avoiding the problem of incomplete sterilization caused by insufficient heating of local substrates. This significantly improves the consistency and reliability of the sterilization effect, ensuring that the substrates all meet the qualified sterilization standards.

[0007] As a preferred technical solution of this utility model, the support frame is constructed of hollow square tubing. A fixed block is slidably connected to the upper left side of the support frame. There are two fixed blocks symmetrically distributed, and a conveying pipe is movably connected between the fixed blocks. One end of the conveying pipe is fixedly connected to a first motor, and the other end of the conveying pipe is fixedly connected to a feed box. An auger is rotatably connected inside the conveying pipe. The input shaft of the auger is fixedly connected to the first motor. The end of the conveying pipe connected to the feed box is the feed end, and the end of the conveying pipe assembled with the first motor is the discharge end. The above technical solution utilizes a hollow square tube as the overall structure of the support frame. This significantly reduces the overall weight of the equipment while ensuring the structural strength of each component, facilitating handling, installation, and site relocation, while also saving material costs. Two symmetrically distributed fixing blocks, slidably connected on the upper left side of the support frame, not only stably support the conveying pipe but also provide adjustment space through movable connections, allowing for flexible adaptation to different feed box positions and substrate conveying angles. The design, with the first motor fixed at one end of the conveying pipe and the feed box fixed at the other, and the internal auger fixedly connected to the first motor, ensures high transmission efficiency and stable power, enabling continuous and uniform delivery of the seedling substrate, preventing blockages and accumulation. The clearly defined feed and discharge ends ensure controllable conveying paths, guaranteeing smooth feeding and laying the foundation for continuous operation of subsequent processes, thus improving overall operational efficiency.

[0008] As a preferred technical solution of this utility model, the left side of the support frame is fixedly connected to the distribution hopper, the distribution hopper is a bidirectional open structure, the inner wall of the left side of the distribution hopper is fixedly connected to the screening grid, the outer wall of the right side of the distribution hopper is fixedly connected to the transducer, the top of the distribution hopper is movably connected to the spray pipe, the bottom of the spray pipe is equipped with a total of eight atomizing nozzles, and the left end of the spray pipe is an external thread structure. The above technical solution features a bidirectional open hopper fixed on the left side of the support frame, which allows for substrate diversion and centralized feeding according to production needs, enhancing the flexibility of equipment use. A screening grid fixed to the inner wall of the left side of the hopper filters large impurities and clumps before the substrate enters subsequent processes, preventing blockages in the conveying pipes and rollers, while ensuring uniform substrate particle size, laying the foundation for uniform sterilization. A transducer fixed to the outer wall of the right side of the hopper generates vibration, which assists the screening grid in improving filtration efficiency and preventing mesh blockage, while also promoting rapid substrate flow to avoid stagnation. A spray pipe movably connected to the top of the hopper, with eight atomizing nozzles at the bottom, evenly atomizes and sprays liquid onto the substrate surface, improving pretreatment effects. The external thread structure at the left end of the spray pipe facilitates installation, disassembly, and subsequent cleaning and maintenance, reducing maintenance costs.

[0009] As a preferred technical solution of this utility model, a drive shaft is rotatably connected above the support frame. There are two drive shafts symmetrically distributed. A second motor is fixedly connected to the side of the support frame. The output shaft of the second motor is fixedly connected to the drive shaft. The drive shaft is meshed with a roller through a gear ring. The roller is rotatably connected to the drive shaft through a guide ring. A conveying petal is fixedly connected to the inner wall of the roller. The conveying petal has a spiral structure. Rollers and gears are arranged on the surface of the drive shaft and connected to the guide ring and gear ring on the surface of the roller. Using the above technical solution, two symmetrically distributed drive shafts rotatably connected above the support frame, with the output shaft of a second motor fixed on the side and the drive shaft fixed to it, provide dual power support for the drum, avoiding uneven drum swaying caused by single-sided drive and improving the stability of equipment operation. The drive shaft is connected to the drum through a gear ring, with precise transmission ratio and efficient power transmission. The drum speed can be adjusted according to the characteristics of the substrate, improving the adaptability of the equipment. The drum is rotatably connected to the drive shaft through a guide ring, and the rollers and gears on the drive shaft surface cooperate with the guide ring and gear ring, greatly reducing rotational friction, reducing energy consumption and component wear, and extending service life. At the same time, the spiral conveying petals fixed on the inner wall of the drum can push the substrate to move at a uniform speed and fully rotate when the drum rotates, allowing the substrate to come into full contact with high temperature and microwave, avoiding incomplete local sterilization and improving sterilization uniformity and thoroughness.

[0010] As a preferred embodiment of this utility model, the support frame has two symmetrically distributed conveying pipes on its side. By adopting the above technical solution, the two symmetrically distributed conveying pipes on the side of the support frame can realize simultaneous or alternating feeding of materials from both sides, which can greatly improve the feeding efficiency of seedling substrate and meet the needs of large-scale production. The symmetrical distribution structure can also make the force on both sides of the equipment balanced, avoid the center of gravity shift caused by feeding from one side, reduce equipment vibration and improve overall stability. In addition, the dual conveying pipe design increases the flexibility of use. When the processing volume is small, only one channel can be used to reduce energy consumption and realize on-demand production, taking into account both efficiency and energy saving requirements.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Scientific structural design, balancing stability and convenience: The support frame is made of hollow square tube material, which reduces the weight of the equipment while ensuring support strength, making it easy to transport and move to another site; the sliding + bolt fixing combination of L-shaped guide rail groove and protective cover ensures sealing and safety during operation, and simplifies opening and closing operations during maintenance; the design of bolted drying bracket and external thread structure spray pipe makes component installation, inspection and replacement more convenient and reduces maintenance costs.

[0012] 2. Efficient and adaptable conveying and pretreatment to ensure smooth process: The dual symmetrically distributed conveying pipes can flexibly switch between single / dual-path operation, taking into account both large-scale feeding efficiency and small-scale energy-saving needs; the direct drive design of the auger and motor enables continuous and uniform conveying of the substrate, avoiding blockage; the bidirectional opening of the distribution hopper, the impurity filtration of the screening grid, the vibration assistance of the transducer, and the uniform atomization of the spray pipeline form a complete pretreatment system, which not only ensures the uniformity of substrate particles, but also can perform targeted humidification or auxiliary sterilization, laying the foundation for subsequent sterilization.

[0013] 3. Precise and uniform sterilization effect, adaptable to diverse needs: Six evenly distributed microwave emitters form a full-area radiation field, which, together with the spiral conveying petals on the inner wall of the drum, allows the substrate to be fully tumbled during the conveying process, ensuring that each area is heated evenly and completely solving the problem of incomplete local sterilization; the meshing transmission of the dual drive shaft and the gear ring can precisely control the drum speed, adapting to the sterilization needs of substrates with different humidity and particle size, and improving the versatility of the equipment.

[0014] 4. Safety and energy saving are both taken into account, and the equipment life is extended: The locking design of the protective cover and the sealing protection against microwave and high temperature not only prevent operators from contacting dangerous parts, but also reduce energy leakage and reduce energy consumption; the guide ring and roller of the drive shaft and the roller cooperate to greatly reduce rotational friction, reduce component wear, and extend the service life of the core components of the equipment; the symmetrical design of the overall structure, drive shaft and conveying pipe ensure that the equipment is subjected to balanced force during operation, reduce vibration and improve long-term operation stability. Attached Figure Description

[0015] Figure 1 This is a side view of the structure of this utility model; Figure 2 This is a schematic diagram of the second motor and drum structure of this utility model; Figure 3 This is a schematic diagram of the spray pipe and fixing block structure of this utility model; Figure 4 This is a side view of the protective cover structure of this utility model; Figure 5 This is a schematic diagram of the drive shaft and guide rail groove structure of this utility model; Figure 6 This is a side view of the cross-sectional structure of the conveying pipe of this utility model; Figure 7 This is a schematic diagram of the toothed ring and guide ring structure of this utility model; Figure 8 This is a side view of the cross-sectional structure of the material distribution hopper of this utility model; Figure 9 This is a side view of the drying rack structure of this utility model; Figure 10 This is a side view structural diagram of Embodiment 2 of the present utility model.

[0016] In the diagram: 1. Support frame; 2. Protective cover; 3. Distribution hopper; 4. Screening grid; 5. Spray pipe; 6. Fixing block; 7. Conveying pipe; 8. Feed box; 9. Screw conveyor; 10. First motor; 11. Drying bracket; 12. Second motor; 13. Drum; 14. Transducer; 15. Drive shaft; 16. Guide rail groove; 17. Conveying disc; 18. Gear ring; 19. Guide ring; 20. Microwave transmitter. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-10 The present invention provides a high-temperature sterilization device for seedling substrate; Example 1. For details, please refer to the following: Figure 1 - Figure 9 It includes a support frame 1, a protective cover 2, a material distribution hopper 3, a screening grid 4, a spray pipe 5, a fixing block 6, a conveying pipe 7, a feed box 8, an auger 9, a first motor 10, a drying bracket 11, a second motor 12, a drum 13, a transducer 14, a drive shaft 15, a guide rail groove 16, a conveying petal 17, a toothed ring 18, a guide ring 19, and a microwave transmitter 20; A pretreatment mechanism is provided above the support frame 1. The pretreatment mechanism includes a distribution hopper 3, a screening grid 4, a spray pipe 5, and a transducer 14. The transducer 14 is located on the side of the distribution hopper 3, the screening grid 4 is located inside the distribution hopper 3, and the spray pipe 5 is installed on the top of the distribution hopper 3.

[0019] The support frame 1 has a guide rail groove 16 on its side. The support part of the guide rail groove 16 has an L-shaped structure. The protective cover 2 is slidably connected above the guide rail groove 16. The protective cover 2 is fixed to the right side of the guide rail groove 16 by bolts. The L-shaped guide rail groove 16 has both support and adjustment functions: on the one hand, it provides a stable installation base for the protective cover 2, preventing the protective cover 2 from shaking when the equipment is running; on the other hand, the sliding connection design allows the protective cover 2 to be opened and closed without disassembling the whole, making it more convenient to operate during equipment maintenance and internal cleaning, and greatly shortening downtime for maintenance; the bolt fixing structure on the right side can firmly lock the protective cover 2 during sterilization operations, which not only prevents the leakage of high temperature and microwaves from causing energy waste, but also avoids the safety risks of operators coming into contact with high-temperature components, thus balancing efficiency and safety. The drying bracket 11 is bolted to the inner side of the upper part of the support frame 1. The microwave transmitter 20 is bolted to the center line of the drying bracket 11. There are six microwave transmitters 20 evenly distributed. The bolt fixing method makes the installation and disassembly of the drying bracket 11 and the microwave transmitter 20 more convenient. The main structure of the equipment does not need to be damaged when the components are repaired or replaced. The six microwave transmitters 20 evenly distributed along the center line can form an all-round microwave radiation area without dead angles inside the drum 13, ensuring that the substrate is heated evenly in all parts during the transportation process. This completely solves the problem of insufficient sterilization caused by insufficient heating of local substrates, significantly improves the stability of sterilization effect, and ensures that each batch of substrate meets the seedling hygiene standards. The support frame 1 is constructed entirely of hollow square tubing. Two symmetrically distributed fixed blocks 6 are slidably connected to the upper left side of the support frame 1, and a conveying pipe 7 is movably connected between them. One end of the conveying pipe 7 is fixedly connected to the first motor 10, and the other end is fixedly connected to the feed box 8. An auger 9 is rotatably connected inside the conveying pipe 7, and the input shaft of the auger 9 is fixedly connected to the first motor 10. The end of the conveying pipe 7 connected to the feed box 8 is the feeding end, and the end of the conveying pipe 7 assembled with the first motor 10 is the discharging end. The hollow square tubing material effectively reduces the material's weight while ensuring the structural strength of the support frame 1. The overall weight is designed to facilitate equipment handling and site relocation, while also reducing material usage to control costs. Two symmetrical fixed blocks 6 are connected by sliding and movable connections, which not only stably support the conveying pipe 7, but also allow the conveying pipe 7 to be flexibly adjusted according to the feeding position and substrate conveying angle to adapt to different production scenarios. The direct drive design of the auger 9 and the first motor 10 results in low power loss and stable transmission, enabling continuous and uniform substrate conveying and preventing blockage of the conveying pipe 7. With clear division of the inlet and outlet ends, the feeding process is ensured to be smooth, providing a guarantee for the continuous operation of subsequent material distribution and sterilization processes. The left side of the support frame 1 is fixedly connected to the distribution hopper 3, which has a two-way opening structure. The inner left wall of the distribution hopper 3 is fixedly connected to the screening grid 4, and the outer right wall of the distribution hopper 3 is fixedly connected to the transducer 14. The top of the distribution hopper 3 is movably connected to the spray pipe 5, which is equipped with eight atomizing nozzles at the bottom. The left end of the spray pipe 5 has an external thread structure. The two-way opening distribution hopper 3 can flexibly choose to divert or centrally convey according to the production scale, improving the equipment adaptability. The screening grid 4 can pre-filter large impurities and lumps in the matrix to avoid subsequent clogging of the conveying pipe 7 or roller 13, while ensuring uniform matrix particles, laying the foundation for efficient sterilization. The vibration generated by the transducer 14 can assist the grid filtration, prevent impurities from clogging the mesh, and also promote the rapid flow of the matrix to avoid stagnation. The eight atomizing nozzles make the spray more uniform and can be used to humidify the matrix or spray auxiliary sterilization liquid to improve the pretreatment effect. The external thread structure facilitates the installation, disassembly and cleaning of the spray pipe 5, reducing maintenance difficulty. Two drive shafts 15 are symmetrically distributed on the top of the support frame 1. A second motor 12 is fixedly connected to the side of the support frame 1. The output shaft of the second motor 12 is fixedly connected to the drive shafts 15. The drive shafts 15 are connected to the roller 13 via a gear ring 18. The roller 13 is rotatably connected to the drive shafts 15 via a guide ring 19. A conveyor plate 17 with a spiral structure is fixedly connected to the inner wall of the roller 13. Rollers and gears are arranged on the surface of the drive shafts 15 and connected to the guide ring 19 and gear ring 18 on the surface of the roller 13. The two drive shafts 15 and the second motor 12 cooperate to provide balanced power to the roller 13. To avoid uneven load and swaying of the roller 13 caused by unilateral drive, the equipment's operational stability is improved. The high precision of the gear ring 18 allows for flexible adjustment of the roller 13's speed according to substrate type, such as humidity and particle size, to adapt to different sterilization needs. The guide ring 19, in conjunction with the rollers and gears of the drive shaft 15, significantly reduces friction during roller 13 rotation, reducing energy consumption and component wear, and extending the equipment's service life. Meanwhile, the spiral conveyor 17 propels the substrate forward at a uniform speed while the roller 13 rotates, simultaneously causing the substrate to tumble, ensuring that each part of the substrate can fully contact the high temperature and microwaves, thoroughly solving the problem of incomplete local sterilization. Example 2

[0020] For details, please refer to the following: Figure 10 The difference between this embodiment and Embodiment 1 is that: there are two symmetrically distributed conveying pipes 7 on the side of the support frame 1; Two symmetrical conveying pipes 7 enable simultaneous dual-path feeding, significantly improving substrate conveying efficiency and meeting the batch sterilization requirements of large-scale seedling production. The symmetrical distribution design ensures balanced force on both sides of the support frame 1, avoiding equipment center of gravity shift caused by single-sided feeding, reducing vibration during operation, and improving overall equipment stability. In addition, the equipment can flexibly select single-path or dual-path operation according to the processing volume. When the processing volume is small, only one conveying pipe 7 is used, effectively reducing energy consumption and achieving "energy consumption on demand," balancing production efficiency and energy-saving requirements.

[0021] Working principle: When using a high-temperature sterilization device for seedling substrate, during the feeding and conveying stage, the substrate for seedling cultivation of vegetables, fruits, medicinal materials, flowers, etc., is first put into the feeding box 8, and then smoothly enters the feeding end of the conveying pipe 7 at the connection end between the conveying pipe 7 and the feeding box 8. After starting the first motor 10, its output shaft directly drives the auger 9 inside the conveying pipe 7 to rotate. With the continuous thrust generated by the spiral structure of the auger 9, the substrate is pushed at a uniform speed to the discharge end of the conveying pipe 7 at the assembly end of the conveying pipe 7 and the first motor 10, effectively avoiding blockage and accumulation. The conveying pipe 7 is movably supported by two symmetrical fixed blocks 6 on the left side of the support frame 1. The fixed blocks 6 can slide and adjust along the support frame 1 to adapt to different feeding angles and site requirements. If the dual conveying pipes 7 are symmetrically distributed, single or dual synchronous feeding can be flexibly selected according to the processing volume, taking into account both operating efficiency and energy consumption control. The pretreatment stage is a key step in improving the subsequent sterilization effect. The substrate delivered by the conveying pipe 7 enters the distribution hopper 3. The distribution hopper 3 adopts a two-way open structure, which can realize the distribution or centralized conveying of substrate according to production needs. The screening grid 4 on the inner wall of the left side of the distribution hopper 3 will first filter out large impurities and lumps in the substrate to ensure that the substrate particles are uniform. At the same time, the transducer 14 on the outer wall of the right side of the distribution hopper 3 vibrates, which not only helps the screening grid 4 to prevent the mesh from clogging and improve the filtration efficiency, but also promotes the rapid flow of the substrate to avoid stagnation in the distribution hopper 3. The spray pipe 5 connected to the top of the distribution hopper 3 works synchronously. The eight atomizing nozzles at the bottom of the pipe evenly spray liquid water or auxiliary sterilization liquid onto the substrate surface to achieve humidity regulation or pre-sterilization treatment, laying the foundation for subsequent high-temperature sterilization. The external thread structure on the left end of the spray pipe 5 facilitates subsequent disassembly and maintenance. High-temperature sterilization is the core working step of the device. The pretreated substrate enters the drum 13, and the second motor 12 is started. Its output shaft drives the two symmetrical drive shafts 15 above the support frame 1 to rotate. The gears on the surface of the drive shaft 15 mesh with the toothed ring 18 on the outside of the drum 13 for transmission. At the same time, the rollers on the drive shaft 15 roll with the guide ring 19 of the drum 13, which not only provides stable power for the drum 13, but also reduces rotational friction, so that the drum 13 rotates smoothly and at a uniform speed. The spiral conveying petals 17 on the inner wall of the drum 13 rotate with the drum 13. On the one hand, it pushes the substrate to move at a uniform speed along the axis of the drum 13 from the feed end to the discharge end. On the other hand, it drives the substrate to continuously turn and stir, ensuring that there are no sterilization dead corners. At this time, the six evenly distributed microwave emitters 20 on the drying support 11 on the inner side above the support frame 1 are started synchronously, forming a microwave radiation field that covers the entire area along the center line of the drum 13. The microwave energy penetrates the interior of the substrate to generate high temperature. The evenly distributed emitters ensure that the temperature of each area of ​​the substrate is consistent, thoroughly killing bacteria, insect eggs and other harmful organisms. Safety and energy security provide crucial support for the sterilization process. During sterilization, the protective cover 2 slides and closes along the L-shaped support structure of the guide rail groove 16 on the side of the support frame 1, and is then locked in place with bolts. This design not only prevents operators from coming into contact with the high-temperature roller 13 or from microwave leakage, effectively ensuring operational safety, but also reduces the loss of high-temperature and microwave energy inside the roller 13, lowers energy consumption, indirectly improves overall sterilization efficiency, and avoids energy waste. During the discharge and circulation stage, the substrate, after being sterilized by microwave high temperature, is smoothly discharged from the discharge end of the drum 13 under the continuous pushing of the spiral conveying petals 17 on the inner wall of the drum 13, completing a single sterilization process. Since the feeding, pretreatment, and high temperature sterilization of the device can operate continuously without frequent shutdowns, it can achieve batch and automated sterilization of seedling substrate, adapting to the continuous operation needs in large-scale seedling production, and providing a stable supply of qualified sterile substrate for subsequent seedling stages.

[0022] This completes a series of tasks. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature sterilization device for seedling substrate, comprising a support frame (1); characterized in that: A pretreatment mechanism is provided above the support frame (1). The pretreatment mechanism includes a distribution hopper (3), a screening grid (4), a spray pipe (5), and a transducer (14). The transducer (14) is located on the side of the distribution hopper (3), the screening grid (4) is located inside the distribution hopper (3), and the spray pipe (5) is installed on the top of the distribution hopper (3).

2. The high-temperature sterilization device for seedling substrate according to claim 1, characterized in that, The support frame (1) has a guide rail groove (16) on its side. The support part of the guide rail groove (16) is an L-shaped structure. A protective cover (2) is slidably connected above the guide rail groove (16). The protective cover (2) is fixed to the right side of the guide rail groove (16) by bolts.

3. The high-temperature sterilization device for seedling substrate according to claim 2, characterized in that, The drying bracket (11) is fixed to the inner side of the upper part of the support frame (1), and the microwave transmitter (20) is fixed to the center line of the drying bracket (11). There are six microwave transmitters (20) evenly distributed.

4. The high-temperature sterilization device for seedling substrate according to claim 3, characterized in that, The support frame (1) is made of hollow square tube. The support frame (1) is slidably connected to the upper left side of the fixed block (6). There are two fixed blocks (6) symmetrically distributed, and the fixed blocks (6) are movably connected to the conveying pipe (7). One end of the conveying pipe (7) is fixedly connected to the first motor (10), and the other end of the conveying pipe (7) is fixedly connected to the feed box (8). The conveying pipe (7) is rotatably connected to the auger (9). The input shaft of the auger (9) is fixedly connected to the first motor (10). The end of the conveying pipe (7) connected to the feed box (8) is the feeding end, and the end of the conveying pipe (7) assembled with the first motor (10) is the discharging end.

5. The high-temperature sterilization device for seedling substrate according to claim 4, characterized in that, The support frame (1) is fixedly connected to the distribution hopper (3) on the left side. The distribution hopper (3) has a two-way open structure. The inner wall of the left side of the distribution hopper (3) is fixedly connected to the screening grid (4). The outer wall of the right side of the distribution hopper (3) is fixedly connected to the transducer (14). The top of the distribution hopper (3) is movably connected to the spray pipe (5). The bottom of the spray pipe (5) is equipped with a total of eight atomizing nozzles. The left end of the spray pipe (5) has an external thread structure.

6. The high-temperature sterilization device for seedling substrate according to claim 5, characterized in that, The support frame (1) is rotatably connected to the drive shaft (15). There are two drive shafts (15) symmetrically distributed. The support frame (1) is fixedly connected to the side of the second motor (12). The output shaft of the second motor (12) is fixedly connected to the drive shaft (15). The drive shaft (15) is meshed with the roller (13) through the toothed ring (18). The roller (13) is rotatably connected to the drive shaft (15) through the guide ring (19). The inner wall of the roller (13) is fixedly connected to the conveying petal (17). The conveying petal (17) has a spiral structure. The surface of the drive shaft (15) is equipped with rollers and gears and is connected to the guide ring (19) and toothed ring (18) on the surface of the roller (13).

7. The high-temperature sterilization device for seedling substrate according to claim 6, characterized in that, The support frame (1) has two symmetrically distributed conveying pipes (7) on its side.

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