Biomass hot blast stove for drying unhulled rice

Abstract

The utility model relates to the technical field of agriculture, and discloses a biomass hot-blast stove for drying rice, which comprises a hot-blast stove, the top of the hot-blast stove is fixedly connected with a smoke exhaust pipe, the inner wall of the smoke exhaust pipe is inserted with a filter screen, the left side and the right side of the filter screen are inserted with limiting insertion blocks, and the inner walls of the two limiting insertion blocks are connected through a fixing assembly. Four supporting rods are fixedly connected to the bottom of the hot blast stove, pulleys are rotationally connected to the inner walls of the supporting rods, and the front sides and the rear sides of the pulleys are connected through limiting assemblies so that the pulleys can be fixed. According to the utility model, smoke is filtered through the filter screen, the crank is rotated to enable the two limiting insertion blocks to slide to unfasten the fixation of the filter screen, and the filter screen is pulled out to be replaced and is cleaned and replaced; therefore, the replacement speed of the filter screen is increased, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of agricultural technology, and in particular to a biomass hot air furnace for drying rice. Background Technology

[0002] With the development of modern agriculture, rice production and processing are gradually moving towards mechanization, automation, and large-scale operations. In particular, rice drying technology has become a crucial part of the post-harvest processing of rice. After harvesting, rice contains a high moisture content; excessive moisture not only hinders storage and transportation but can also lead to mold growth and quality deterioration. Therefore, drying is an indispensable step in rice processing.

[0003] Traditional rice drying methods generally employ sun-drying and mechanical drying. Sun-drying is heavily influenced by weather conditions, requiring a long time and being inefficient. While mechanical drying can complete the drying process in a shorter time, it has high operating costs and energy consumption, resulting in significant energy waste and environmental pollution. With increasingly stringent environmental protection requirements, traditional coal-fired and oil-fired hot air furnaces are gradually revealing their limitations, with energy waste and air pollution becoming their main drawbacks.

[0004] To improve drying efficiency, reduce energy consumption, and minimize environmental pollution, biomass energy is gradually becoming an ideal alternative energy source. Biomass hot air furnaces use agricultural and forestry waste such as straw, sawdust, and bamboo shavings as raw materials, employing biomass combustion as a heat source. This not only meets green and environmentally friendly requirements but also effectively utilizes agricultural waste, solving the waste disposal problem.

[0005] Biomass energy is a renewable energy source formed from the conversion of organic matter such as plants and animals, primarily derived from agriculture, forestry, and urban waste. Compared to traditional fossil fuels, biomass energy offers numerous advantages, including being renewable, low-carbon, and clean. Biomass hot air furnaces, as a new type of thermal energy equipment, use biomass fuel for combustion to generate high-temperature hot airflow, and are widely used in various drying operations.

[0006] The advantages of biomass energy include:

[0007] Environmental friendliness: Biomass energy releases relatively little carbon dioxide when burned, and the ash can be used as organic fertilizer, avoiding the pollution caused by traditional fuels. The emissions during biomass combustion are also low, meeting national standards for air pollutant emissions.

[0008] Energy sustainability: Biomass energy has a wide range of sources, especially agricultural waste and forestry byproducts, and is highly sustainable. Through appropriate technological means, energy can be recycled, solving many farmers' problems of waste disposal and pollution.

[0009] Energy efficiency: Biomass hot air furnaces can effectively utilize heat during operation, recovering and reusing waste gas and heat, resulting in high thermal efficiency and reducing energy waste.

[0010] Therefore, biomass hot air furnaces can not only improve drying efficiency and reduce energy consumption, but also reduce carbon emissions, which is in line with the current trend of green and environmentally friendly development.

[0011] Rice drying is a crucial step in rice processing, its main purpose being to reduce the moisture content of the rice to a suitable level, typically requiring a moisture content of 12%-14%. Traditional rice drying methods include natural sun-drying and mechanical drying.

[0012] Natural sun-drying: Natural sun-drying is the most traditional method of drying rice. Harvested rice is typically spread out in the sun, where solar radiation heats and evaporates the moisture. While this method is simple and requires no equipment, its biggest drawback is its susceptibility to weather conditions. The drying process is slow and cannot guarantee uniform drying, especially in humid seasons or rainy weather, where the results are less than ideal.

[0013] Mechanical drying includes various methods such as hot air drying and fluidized bed drying. Hot air drying is one of the most common drying methods, typically using coal, oil, or electric heating to provide hot air. Although mechanical drying greatly improves drying efficiency, it has high energy consumption, and the choice of fuel is mostly fossil fuels, resulting in significant energy consumption and environmental pollution.

[0014] With increasingly stringent environmental policies, traditional energy-intensive drying equipment is facing significant technological and market pressures. Therefore, reducing energy consumption, improving drying efficiency, and minimizing environmental pollution have become important research directions for modern rice drying technology.

[0015] Biomass hot air furnaces, as an environmentally friendly and efficient heating device, have been widely used in many industries, especially in agriculture. Applying biomass hot air furnaces to rice drying not only solves the problem of excessive energy consumption but also reduces environmental pollution.

[0016] The main working principle of a biomass hot air furnace is to generate a high-temperature hot airflow by burning biomass fuels (such as straw, sawdust, etc.), and then transport the hot air to the drying chamber through hot air ducts to heat the rice. The entire process can be regulated by a precise temperature control system to ensure the uniformity and efficiency of rice drying.

[0017] Specifically, the advantages of biomass hot air furnaces in rice drying are mainly reflected in the following aspects:

[0018] Low-cost energy: Biomass fuel is typically derived from agricultural waste and forestry byproducts, raw materials that are abundant and inexpensive in most regions. Compared to traditional coal-fired and oil-fired hot air furnaces, biomass hot air furnaces have significantly lower operating costs, especially for agricultural producers, reducing the burden of energy procurement.

[0019] Improved drying efficiency: Biomass hot air furnaces have high combustion efficiency and can provide stable hot air, ensuring that rice is heated evenly during the drying process, thereby improving drying efficiency, shortening the drying cycle, and reducing moisture loss.

[0020] Environmental friendliness: Biomass hot air furnaces can reduce emissions of carbon dioxide and harmful gases, and the ash from their combustion can be used as fertilizer, effectively reducing pollution problems caused by agricultural waste.

[0021] High adaptability: Biomass hot air furnaces can adapt to a variety of fuels and can adjust fuel use according to different agricultural wastes or renewable resources, thus exhibiting strong adaptability.

[0022] Existing biomass low-hydrogen combustion boilers filter flue gas through filters to reduce pollutant emissions. However, after prolonged use, the filters become less effective due to the accumulation of dust and impurities, requiring timely replacement. Current filter disassembly methods are particularly cumbersome, often requiring specialized tools and complex procedures, consuming significant time and manpower. To address this technical problem, this application proposes a biomass hot air furnace for rice drying. Summary of the Invention

[0023] The purpose of this invention is to address the shortcomings of existing technologies by proposing a biomass hot air furnace for rice drying. The furnace filters smoke through a filter screen, and rotating the handle causes two limiting blocks to slide and release the filter screen, allowing it to be removed and replaced. The filter screen is then cleaned and replaced, thus accelerating the replacement speed and improving work efficiency.

[0024] To achieve the above objectives, the present invention provides the following technical solution:

[0025] A biomass hot air furnace for drying rice includes a hot air furnace, an exhaust pipe fixedly connected to the top of the hot air furnace, a filter screen inserted into the inner wall of the exhaust pipe, limit blocks inserted into both the left and right sides of the filter screen, the inner walls of two limit blocks connected by a fixing component to adjust the distance between the two limit blocks, and four support rods fixedly connected to the bottom of the hot air furnace, with pulleys rotatably connected to the inner walls of the support rods, the front and rear sides of the pulleys connected by a limit component to fix the pulleys.

[0026] Furthermore, the fixing assembly includes a bidirectional screw threaded to the inner wall of the two limiting blocks, a worm gear fixedly connected to the right end of the bidirectional screw, and a worm engaged with the bottom side of the outer wall of the worm gear.

[0027] Furthermore, a crank handle is rotatably connected to the rear side of the exhaust pipe, and the rear end of the worm gear is fixedly connected to the front end of the crank handle.

[0028] Furthermore, the limiting assembly includes a first gear fixedly connected to the front and rear sides of the pulley, a second gear meshing with the top side of the outer wall of the first gear, four limiting springs provided on the inner wall of the support rod, a limiting rack slidably connected to the inner wall of the support rod, and the right side of the limiting rack meshing with the outer wall of the second gear.

[0029] Furthermore, one end of the limiting spring is fixedly connected to the left side of the inner wall of the support rod, and the other end of the limiting spring is fixedly connected to the left side of the limiting rack.

[0030] Furthermore, an adjusting screw is threadedly connected to the left side of the support rod, and the right end of the adjusting screw abuts against the left side of the limiting rack.

[0031] Furthermore, a first connecting ring is fixedly connected to the top of both the front and rear sides of the hot air furnace, and two sliding grooves are opened on both the front and rear sides of the hot air furnace, with a second connecting ring slidably connected to the inner wall of the sliding groove.

[0032] The development process of the biomass hot air furnace in this application involves multiple steps, from requirements analysis to design conception and detailed design, mainly including the following aspects:

[0033] The applicant designed this biomass hot air furnace to address the energy efficiency and environmental friendliness issues encountered in the rice drying process. To this end, a survey was first conducted on the basic requirements for rice drying, mainly focusing on the following aspects:

[0034] Hot air furnace efficiency: Ensure that the temperature and flow rate of the hot air inside the furnace are suitable for the drying needs of rice.

[0035] Exhaust pipe design: The exhaust pipe needs to be designed to effectively remove the exhaust gas from inside the hot air furnace while ensuring safety.

[0036] Adjustability: The hot air furnace should be adjustable according to different drying conditions, such as the spacing of the filter screen and the adjustment of components such as pulleys.

[0037] Ease of operation: The equipment should be easy to operate, making it convenient for users to maintain and adjust it.

[0038] After a detailed analysis of the requirements, the applicant's goal is to design a biomass hot air furnace system that is efficient, energy-saving, and easy to operate.

[0039] Hot air furnace structure: A solution was chosen that integrates the hot air furnace with the main components such as the exhaust pipe, filter screen, and support rod.

[0040] Adjustment mechanism: To ensure that the equipment can adapt to different working conditions, an adjustable filter screen spacing system is designed, which is realized through a bidirectional screw and worm gear transmission system.

[0041] Stability design: The use of four support rods and a pulley system enhances the stability of the equipment, and the pulley position is fixed by a limit component to ensure smooth operation of the equipment.

[0042] Filter design: The design of the filter includes its size, material and support structure to ensure that it can effectively filter impurities in the exhaust pipe and has sufficient durability.

[0043] Two-way screw adjustment mechanism: A combination of a two-way screw and a worm gear is designed, and the filter screen spacing is adjusted by rotating the screw. For manual adjustment, the rear end of the worm gear is connected to the user via a crank, providing a simple and easy-to-use operation method.

[0044] Support system design: The design of the support rods and pulleys is intended to improve the stability of the hot blast stove, while the movement of the support rods is controlled by a limit spring and rack system to ensure that the pulleys can run smoothly.

[0045] Connecting ring and slide design: Connecting rings and slides are designed on the front and rear sides of the hot air furnace, allowing users to adjust the overall structure of the equipment by sliding the second connecting ring for installation or disassembly.

[0046] The applicant subsequently refined the overall design of the hot blast stove, focusing on resolving issues related to the adjustment mechanism, stove efficiency, and safety. The refined design of the coordination between components and the adjustment system became highlights of the equipment. In particular, the structural combination of a bidirectional screw and a worm gear design made adjustments more convenient and provided higher stability.

[0047] After completing all the designs, the team integrated the various parts of the hot blast furnace to ensure that all components could work together effectively. At this point, the overall layout and operating system of the equipment were initially completed, meeting the initial design requirements.

[0048] After multiple discussions and revisions, the final complete design scheme of the biomass hot air furnace was determined. The design scheme of this application focuses on efficient hot air circulation, reasonable adjustment mechanism, reliable support system and ease of operation.

[0049] This utility model has the following beneficial effects:

[0050] 1. Energy-saving and High-Efficiency: This utility model's biomass hot air furnace adopts highly efficient biomass combustion technology, maximizing fuel utilization efficiency. Compared with traditional hot air furnaces, this equipment optimizes the design of the hot air circulation system and combustion system, resulting in more complete combustion and reducing energy waste. During combustion, the temperature and hot air flow rate of the hot air furnace can be adjusted according to different drying requirements, further improving energy efficiency in the drying process. This efficient energy utilization not only reduces production costs but also contributes to lower carbon emissions and environmental protection, aligning with modern energy-saving and environmental protection trends.

[0051] 2. Highly adjustable and widely adaptable: This biomass hot air furnace features a flexible and adjustable filter spacing system and wind speed adjustment device, enabling the furnace to adjust its operating status according to different rice varieties, humidity levels, and drying requirements. For example, through a bidirectional screw and worm gear transmission system, users can precisely adjust the filter spacing according to actual needs. This design allows the hot air furnace to adapt to the drying requirements of different types of materials, making it widely applicable to agricultural products, medicinal herbs, timber, and other materials requiring hot air drying, thus enhancing the equipment's versatility.

[0052] 3. Improved Stability of the Hot Air Furnace: The biomass hot air furnace of this invention places particular emphasis on equipment stability in its structural design. By employing four support rods and a pulley system, the equipment's wind resistance and stability are effectively increased, ensuring that the equipment will not tilt or malfunction due to changes in the external environment or improper operation during operation. The design of the limit spring and rack system further controls the movement of the support rods, preventing excessive shaking or instability of the equipment. This stable structure not only extends the service life of the equipment but also ensures operational safety and uniform drying results.

[0053] 4. Easy to operate and maintain: This biomass hot air furnace prioritizes user experience, with optimized design for ease of operation and maintenance. Adjusting the filter screen spacing, support rods, and pulleys is very simple; users can easily complete the operation using only a crank and adjustment device, avoiding complex adjustment processes and improving production efficiency. Furthermore, the modular design of each component facilitates maintenance and replacement, extending the equipment's lifespan and reducing maintenance costs and downtime.

[0054] 5. Superior Environmental Friendliness and Reduced Emissions: As a biomass hot air furnace, this invention fully considers environmental factors in its design. Compared with traditional coal-fired or oil-fired hot air furnaces, the use of biomass fuel significantly reduces dependence on fossil fuels and reduces emissions of carbon dioxide and other harmful gases. The combustion system of the biomass hot air furnace is carefully designed to ensure complete combustion of fuel, minimizing pollutant emissions from flue gas. Furthermore, the equipment adopts a highly efficient exhaust pipe design, effectively discharging waste gas and avoiding environmental pollution, thus meeting the requirements of green and environmentally friendly development.

[0055] 6. Improved Drying Efficiency: The biomass hot air furnace features a rationally designed hot air circulation system that ensures uniform distribution of hot air, thereby improving the drying effect. The internal hot air velocity, temperature, and humidity can be precisely controlled, effectively preventing overheating or under-drying and ensuring the stable quality of rice or other materials during the drying process. This precise drying control system helps improve the consistency of drying results, ensuring that the quality and nutritional components of the final dried material are not lost.

[0056] 7. Compact structure and space-saving: The biomass hot air furnace of this utility model fully considers space utilization in its structural design. The equipment adopts a compact layout and rationally arranges the positions of various components, resulting in a smaller footprint and easier installation and use. For small processing plants or workplaces with limited space, the compact design of the equipment can effectively save space, reduce site usage costs, and improve site utilization efficiency.

[0057] 8. Low noise, improved working environment: Traditional hot air furnaces often produce significant noise during operation. However, this new biomass hot air furnace significantly reduces noise levels through optimized fan design and airflow system. The low-noise design not only improves the comfort of the operating environment and reduces interference with workers, but also makes the equipment meet the requirements of modern production, thus improving the quality of the working environment.

[0058] 9. Strong adaptability and broad market prospects: This biomass hot air furnace has strong adaptability and can meet the drying needs of different fields. Whether in agriculture, forestry, food processing, or medicinal herb drying, this equipment can be used for efficient drying. Furthermore, with increasingly stringent environmental policies, the use of biomass energy to replace traditional fossil fuels has become a trend, further enhancing the market competitiveness and development potential of this equipment. The equipment has a wide range of applications, large market demand, and good commercial prospects.

[0059] 10. Reduced Production Costs: By improving fuel utilization and drying efficiency, this biomass hot air furnace can significantly reduce production costs. Due to its low energy consumption, short drying time, and simple maintenance, the equipment can save substantial energy and maintenance costs over the long term, improving the company's economic efficiency. Simultaneously, the equipment's stability and durability reduce the frequency of replacement and repair, further lowering the company's operating costs.

[0060] 11. This utility model's biomass hot air furnace, with its numerous advantages such as high efficiency and energy saving, convenient operation, and environmental friendliness, meets the modern industrial requirements for equipment that is efficient, economical, and environmentally friendly, and has significant application value and market prospects. Through a carefully designed adjustment system, an optimized hot air circulation system, and a stable structural design, the equipment not only provides excellent drying results but also greatly improves production efficiency, reduces operating costs, and promotes the application of green and environmentally friendly technologies. Therefore, this equipment has broad application prospects in fields such as agricultural product processing, food drying, and wood processing. Attached Figure Description

[0061] Figure 1 This is a perspective view of a biomass hot air furnace for drying rice according to the present invention.

[0062] Figure 2 This is a schematic diagram of a filter screen for a biomass hot air furnace for drying rice, as proposed in this utility model.

[0063] Figure 3 This is a schematic diagram of the worm gear of a biomass hot air furnace for drying rice, as proposed in this utility model.

[0064] Figure 4 This is a schematic diagram of the second gear of a biomass hot air furnace for drying rice, as proposed in this utility model.

[0065] Figure 5 This is a schematic diagram of a limiting spring for a biomass hot air furnace used for rice drying, as proposed in this utility model.

[0066] Legend:

[0067] 1. Hot air furnace; 2. Support rod; 3. Exhaust pipe; 4. First connecting ring; 5. Second connecting ring; 6. Adjusting screw; 7. Filter screen; 8. Limiting block; 9. Double-acting screw; 10. Handle; 11. Worm gear; 12. Worm; 13. Pulley; 14. First gear; 15. Second gear; 16. Limiting rack; 17. Limiting spring. Detailed Implementation

[0068] 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.

[0069] Reference Figures 1-3 This utility model provides an embodiment of a biomass hot air furnace for drying rice, comprising a hot air furnace 1. It generates high-temperature flue gas by burning agricultural waste such as rice husks and straw, and transfers the heat to clean air using a heat exchange system to form pollution-free drying hot air. The hot air is then transported by a fan to the rice drying chamber, where it slowly removes moisture from the rice with gentle and uniform heat, avoiding damage to the grain quality from high temperatures. A flue pipe 3 is fixedly connected to the top of the hot air furnace 1, and a filter screen 7 is inserted into the inner wall of the flue pipe 3. Smoke is discharged from the flue pipe 3, and the filter screen 7 filters the smoke. Limiting blocks 8 are inserted into both sides of the filter screen 7, and two bidirectional screws 9 are threaded onto the inner walls of the two limiting blocks 8. Rotation of the bidirectional screws 9 causes the two limiting blocks 8 to slide. A worm gear 11 is fixedly connected to the right end of the screw 9. The rotation of the worm gear 11 drives the bidirectional screw 9 to rotate. A worm 12 is meshed with the bottom side of the outer wall of the worm gear 11. The rotation of the worm 12 meshes with the worm gear 11, driving the worm gear 11 to rotate. A crank handle 10 is rotatably connected to the rear side of the flue pipe 3. The rear end of the worm 12 is fixedly connected to the front end of the crank handle 10. Rotating the crank handle 10 drives the worm 12 to rotate. A first connecting ring 4 is fixedly connected to the top of both the front and rear sides of the hot blast stove 1. Two sliding grooves are opened on both the front and rear sides of the hot blast stove 1. A second connecting ring 5 is slidably connected to the inner wall of the sliding groove. For long-distance transportation, the rope is fixed to the second connecting ring 5 and then passes through the first connecting ring 4 for hoisting. When the boiler 1 is hoisted, the rope drives the second connecting ring 5 to slide to the top of the sliding groove to limit its movement.

[0070] Reference Figure 1 , Figure 4 and Figure 5The hot air furnace 1 has four support rods 2 fixedly connected to its bottom. A pulley 13 is rotatably connected to the inner wall of each support rod 2. A first gear 14 is fixedly connected to both the front and rear sides of each pulley 13. A second gear 15 is meshed with the top side of the outer wall of each first gear 14. By locking the first gear 14 with the second gear 15, the pulley is prevented from moving. Furthermore, the rotation of the pulley 13 drives the first gear 14 to rotate, causing the second gear 15 to rotate in a regular pattern, facilitating the locking of the second gear by the limiting rack 16. Four limiting springs 17 are installed on the inner wall of each support rod 2. A limiting rack 16 is slidably connected to the wall. One end of a limiting spring 17 is fixedly connected to the left side of the inner wall of the support rod 2, and the other end of the limiting spring 17 is fixedly connected to the left side of the limiting rack 16. The right side of the limiting rack 16 is engaged with the outer wall of the second gear 15. The limiting spring 17 pulls the limiting rack 16 to slide, thus disengaging the connection between the limiting rack 16 and the second gear 15. An adjusting screw 6 is threadedly connected to the left side of the support rod 2. The right end of the adjusting screw 6 abuts against the left side of the limiting rack 16, and the adjusting screw 6 abuts against the limiting rack 16 to lock the second gear.

[0071] Working principle: When the hot air furnace 1 is working, the smoke is discharged from the exhaust pipe 3. The filter screen 7 filters the smoke. When the filter screen 7 needs to be replaced after a long period of use, the crank handle 10 is rotated to drive the worm gear 12 to rotate. The worm gear 12 meshes with the worm wheel 11 to drive the worm wheel 11 to rotate. The worm wheel 11 drives the double screw 9 to rotate, causing the two limit blocks 8 to slide and release the fixation of the filter screen 7. The filter screen 7 can then be pulled out for replacement. After replacement, the filter screen 7 is inserted back into its original position, and the crank handle 10 is rotated in the opposite direction to fix it.

[0072] When the equipment needs to be moved, the adjusting screw 6 is turned to release the height of the limiting rack 16. The limiting spring 17 pulls the limiting rack 16 to slide, releasing the connection between the limiting rack 16 and the second gear 15, allowing the second gear 15 to rotate. At the same time, the pulley 13 can also rotate. Short-distance transfer can be achieved by pushing. For long-distance transport, the rope is fixed to the second connecting ring 5 and then passed through the first connecting ring 4 for hoisting. When hoisting the boiler 1, the rope drives the second connecting ring 5 to slide to the top of the chute to limit it, which improves the overall hoisting efficiency of the device, saves the cost of the hoisting device, and enhances safety.

[0073] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A biomass hot-air furnace for drying paddy, characterized by, The utility model provides hot -blast furnace (1), hot -blast furnace (1) top fixedly connected with smoke pipe (3), the smoke pipe (3) inner wall inserts the filter screen (7), the filter screen (7) left and right sides all insert the limiting insert block (8), two limiting insert block (8) inner walls are connected through fixed component, for adjusting the interval of two limiting insert block (8), hot -blast furnace (1) bottom fixedly connected with four support rod (2), support rod (2) inner wall rotatably connected with pulley (13), pulley (13) front and back sides are connected through limiting component, for pulley (13) fixed.

2. Biomass hot air furnace for drying paddy according to claim 1, characterized in that: The fixed component includes a bidirectional screw (9) screwed into the inner walls of the two limiting insert blocks (8), a worm wheel (11) fixedly connected to the right end of the bidirectional screw (9), and a worm (12) engaged with the bottom side of the outer wall of the worm wheel (11).

3. Biomass hot-air furnace for drying paddy according to claim 2, characterized in that: The rear side of the smoke pipe (3) is rotatably connected with a crank (10), and the rear end of the worm (12) is fixedly connected with the front end of the crank (10).

4. The biomass hot air furnace for drying paddy according to claim 1, characterized in that: The limiting component includes a first gear (14) fixedly connected to the front and back sides of the pulley (13), a second gear (15) engaged with the top side of the outer wall of the first gear (14), four limiting springs (17) arranged in the inner wall of the support rod (2), and a limiting rack (16) slidably connected to the inner wall of the support rod (2), with the right side of the limiting rack (16) engaged with the outer wall of the second gear (15).

5. Biomass hot-air furnace for drying paddy according to claim 4, characterized in that: One end of the limiting spring (17) is fixedly connected with the left side of the inner wall of the support rod (2), and the other end of the limiting spring (17) is fixedly connected with the left side of the limiting rack (16).

6. Biomass hot-air furnace for drying paddy according to claim 5, characterized in that: The left side of the support rod (2) is threadedly connected with an adjusting screw (6), and the right end of the adjusting screw (6) abuts against the left side of the limiting rack (16).

7. The biomass hot air furnace for drying paddy according to claim 1, characterized in that: The top of the front and back sides of the hot -blast furnace (1) is fixedly connected with a first connecting ring (4), and two sliding grooves are formed in the front and back sides of the hot -blast furnace (1), with a second connecting ring (5) slidably connected to the inner wall of the sliding groove.

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