Stirring mechanism, aerobic composting device and aerobic composting method

Abstract

The invention discloses a stirring mechanism, an aerobic composting device and an aerobic composting method, and relates to the technical field of composting equipment.The stirring mechanism comprises a stirring main shaft and a plurality of stirring arms, the stirring main shaft is driven by a first driving device and used for being vertically and coaxially arranged in a composting bin, and spiral stirring blades are arranged in the circumferential direction of the stirring main shaft; when the stirring main shaft rotates around the axis of the stirring main shaft, the stirring blades can convey materials in the composting bin upwards along the stirring main shaft; one end of each stirring arm is hinged to the side wall of the stirring main shaft, the other end of each stirring arm is connected with a scraping piece, when the stirring main shaft rotates, the stirring arms rotate around the hinge points under the action of centrifugal force and expand outwards, the stirring arms can fully stir materials close to the inner side wall of the composting bin, and the materials adhering to the inner side wall of the composting bin are scraped through the scraping pieces at the ends; through tearing and crushing of the stirring arms, pore channels are continuously created and updated in the materials, so that the materials in the composting bin are in full contact with oxygen for aerobic fermentation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composting equipment, in particular to a stirring mechanism, an aerobic composting device and an aerobic composting method. BACKGROUND

[0002] With the acceleration of urbanization, the discharge amount of organic waste such as food waste has increased significantly. If such waste is treated by traditional methods such as landfilling and incineration, not only a large amount of land resources will be occupied, but also the underground water will be polluted by leachate and greenhouse gases such as methane will be released, which will aggravate the environmental burden. Therefore, efficient and environmentally friendly resource utilization technologies are urgently needed. Aerobic composting has become one of the mainstream technologies for the treatment of organic waste due to its high resource utilization rate, low treatment cost and recyclable products. Through aerobic metabolism of microorganisms, organic waste is degraded and converted into organic fertilizer or soil conditioner rich in nitrogen, phosphorus, potassium and organic matter. Small composting devices are suitable for decentralized treatment scenarios such as families, communities and small farms due to their small size and convenient operation. In recent years, the demand for small composting devices has continued to rise. Most of the existing small composting devices use single-shaft stirring structure. The single-shaft stirring moves the material through the stirring blades arranged in a spiral on the shaft. However, due to the structural limitations, dead angles are easily formed inside the device, and the material close to the inner wall of the device is difficult to be fully stirred, which can lead to material clumping and adhering to the inner wall of the device, and the material cannot fully contact with oxygen, resulting in anaerobic fermentation. SUMMARY

[0003] The purpose of the present application is to provide a stirring mechanism, an aerobic composting device and an aerobic composting method to solve the problems existing in the prior art and enable the material inside the device to fully undergo aerobic fermentation.

[0004] To achieve the above-mentioned purpose, the present application provides the following solutions: The present application provides a stirring mechanism, which comprises a stirring main shaft and a plurality of stirring arms. The stirring main shaft is driven by a first driving device and is vertically coaxially arranged in a composting bin. A spiral stirring blade is arranged on the circumference of the stirring main shaft. When the stirring main shaft rotates around its axis, the stirring blade can convey the material in the composting bin upward along the stirring main shaft. One end of the stirring arm is hinged to the side wall of the stirring main shaft, and the other end is connected to a scraping member. When the stirring main shaft is stationary, the stirring wall naturally droops under the action of gravity. When the stirring main shaft rotates, the stirring arm rotates around the corresponding hinge point and expands outward under the action of centrifugal force, so that the scraping member abuts against the inner side wall of the composting bin.

[0005] The present application also provides an aerobic composting device, which comprises a composting bin, a filtering mechanism and the above-mentioned stirring mechanism. The filtering mechanism is arranged outside the composting bin and communicates with the composting bin to suck and filter the gas in the composting bin.

[0006] In some embodiments, the filtering mechanism comprises an air collecting duct arranged around the circumferential side wall of the compost bin, a plurality of air inlets are formed between the air collecting duct and the circumferential side wall of the compost bin to communicate the air collecting duct with the interior of the compost bin, and an air outlet is arranged at the end of the air collecting duct; an air inlet of the condensing unit is communicated with the air outlet of the air collecting duct, an air pump is arranged between the air inlet of the condensing unit and the air outlet of the air collecting duct to convey the gas in the air collecting duct into the condensing unit, the condensing unit can condense the easily liquefied components in the gas and discharge them, and an air outlet of the condensing unit is communicated with the outside through an air outlet duct.

[0007] In some embodiments, a dust filter screen and an activated carbon filter screen are arranged in sequence along the air flow direction on the air outlet duct.

[0008] In some embodiments, a screening mechanism is further included, which comprises a screening disc, a solid fertilizer collecting box, and a liquid fertilizer collecting box; the screening disc is arranged at the bottom of the compost bin, a plurality of screening holes are formed in the screening disc, and the screening disc can move to allow the materials with a particle size smaller than the screening holes to fall through the screening holes to the bottom of the screening disc; the solid fertilizer collecting box is arranged at the bottom of the screening disc to collect the fallen materials; the liquid fertilizer collecting box is arranged at the bottom of the solid fertilizer collecting box, the liquid in the solid fertilizer collecting box can flow into the liquid fertilizer collecting box, and the liquid fertilizer collecting box is further communicated with the liquid outlet of the condensing unit to collect the condensed liquid discharged by the condensing unit.

[0009] In some embodiments, a temperature sensor and a humidity sensor are further arranged in the interior of the compost bin.

[0010] In some embodiments, the axis of the screening disc is connected with the output shaft of the second driving device, and the second driving device can drive the screening disc to rotate around the axis.

[0011] In some embodiments, transparent observation windows are formed in the solid fertilizer collecting box and the liquid fertilizer collecting box.

[0012] In some embodiments, a controller is further included, which is signal connected with the first driving device, the air pump, the condensing unit, the second driving device, the temperature sensor, and the humidity sensor.

[0013] The application also provides an aerobic composting method, comprising the following steps: starting the first driving device to make the stirring spindle rotate around its own axis, conveying the material in the composting bin upwards along the stirring spindle through the helical stirring blades, and making the stirring wall rotate towards the horizontal direction around the hinge point under the action of centrifugal force, and making the scraping member abut against the inner side wall of the composting bin to scrape the material adhered to the inner side wall of the composting bin; starting the filtering mechanism to suck and filter the gas in the composting bin.

[0014] The application achieves the following technical effects relative to the prior art: The application provides a stirring mechanism, an aerobic composting device and an aerobic composting method, in the axial direction of the stirring spindle, the helical stirring blades are arranged in the circumferential direction of the stirring spindle, when the stirring spindle rotates around its own axis, the material at the bottom of the composting bin can be conveyed upwards along the stirring spindle, the material at the top of the composting bin falls to the bottom of the composting bin under the action of gravity, so that the material is fully contacted with oxygen, in the radial and circumferential directions of the stirring spindle, the stirring arm is hinged to the side wall of the stirring spindle, and the scraping member is connected to the other end of the stirring arm, when the stirring spindle rotates, the stirring arm expands outwards under the action of centrifugal force, the stirring arm can expand the stirring range of the stirring spindle to the center area of the composting bin to the entire interior of the composting bin, fully agitates the material close to the inner side wall of the composting bin, avoids the material from caking, scrapes the material adhered to the inner side wall of the composting bin through the scraping member at the end, tears and breaks through the stirring arm, so that a strong speed difference and shear force are generated between the material, the material forms a complex and irregular vortex path, and the pore channels are continuously created and updated in the material, so that the material in the composting bin is fully contacted with oxygen for aerobic fermentation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Figure 1 The structure schematic diagram of the aerobic composting device in some embodiments of embodiment two; Figure 2 The internal structure schematic diagram of the aerobic composting device in some embodiments of embodiment two; In the figure: 1-stirring mechanism; 11-stirring main shaft; 12-stirring blade; 13-stirring arm; 14-scraping element; 15-first driving device; 2-composting bin; 21-cover; 3-filtering mechanism; 31-air collecting duct; 32-condensing unit; 4-screening mechanism; 41-screening disc; 5-solid fertilizer collecting box; 6-liquid fertilizer collecting box; 7-housing. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] The present application aims to provide a stirring mechanism, an aerobic composting device and an aerobic composting method to solve the problems existing in the prior art, so that the materials in the device can be fully subjected to aerobic fermentation.

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Embodiment one The present embodiment provides a stirring mechanism 1, as shown in Figure 2As shown, the stirring mechanism 1 comprises a stirring spindle 11 and a plurality of stirring arms 13, the stirring spindle 11 is driven by the first driving device 15 and is vertically coaxially arranged in the compost bin 2, a helical stirring blade 12 is arranged on the circumference of the stirring spindle 11, when the stirring spindle 11 rotates around its own axis, the stirring blade 12 can transport the material in the compost bin 2 upwards along the stirring spindle 11; one end of the stirring arm 13 is hinged to the side wall of the stirring spindle 11, and the other end is connected with a scraping member 14, when the stirring spindle 11 is static, the stirring arm 13 naturally droops under the action of gravity, when the stirring spindle 11 rotates, the stirring arm 13 rotates around the hinge point under the action of centrifugal force and expands outward, so that the scraping member 14 abuts against the inner side wall of the compost bin 2. In the axial direction of the stirring spindle 11, by arranging the helical stirring blade 12 on the circumference of the stirring spindle 11, when the stirring spindle 11 rotates around its own axis, the material at the bottom of the compost bin 2 can be transported upwards along the stirring spindle 11, and the material at the top of the compost bin 2 falls to the bottom of the compost bin 2 under the action of gravity, so that the material is fully contacted with oxygen; in the radial and circumferential directions of the stirring spindle 11, by hinging the stirring arm 13 to the side wall of the stirring spindle 11 and connecting the scraping member 14 to the other end of the stirring arm 13, when the stirring spindle 11 rotates, the stirring arm 13 expands outward under the action of centrifugal force, the stirring arm 13 can expand the stirring range of the stirring spindle 11 to the center area of the compost bin 2 to the entire inside of the compost bin 2, fully agitates the material close to the inner side wall of the compost bin 2, avoids material caking, and scrapes the material adhered to the inner side wall of the compost bin 2 through the scraping member 14 at the end, tears and breaks the material through the stirring arm 13, so that a strong speed difference and shear force are generated between the materials, the materials form complex and irregular vortex paths, and continuously create and update pore channels in the materials, so that the materials in the compost bin 2 are fully contacted with oxygen for aerobic fermentation. Further, when the stirring spindle 11 is static, the stirring arm 13 naturally droops under the action of gravity, the stirring radius of the stirring arm 13 gradually increases after starting, which can avoid excessive starting torque of the stirring spindle 11, avoid excessive starting current, and better protect the first driving device 15; further, the stirring spindle 11 is hinged to one end of the stirring arm 13, when the stirring spindle 11 drives the stirring arm 13 to rotate, the scraping member 14 at the other end of the stirring arm 13 encounters hard objects that are difficult to scrape or break, the stirring arm 13 can passively rotate around the hinge point to avoid the hard objects, so as to avoid the first driving device 15 being stuck or the stirring mechanism 1 being damaged, after the stirring is completed, the stirring arm 13 naturally droops under the action of gravity, which is convenient for the user to separate the stirring mechanism 1 and the compost bin 2, and the scraping member 14 will not knock against the inner wall of the compost bin 2 or be stuck by the hard objects adhered to the inner side wall of the compost bin 2 during the separation process.

[0021] In some embodiments, the scraping member 14 is a circular scraper that abuts against the inner side wall of the compost bin 2 and scrapes off the material adhered to the inner side wall of the compost bin 2. In some embodiments, a plurality of tines are arranged in the circumferential direction of the circular scraper to improve the scraping effect on the material on the inner side wall of the compost bin 2.

[0022] Embodiment Two This embodiment provides an aerobic composting device, which comprises a compost bin 2, a filtering mechanism 3 arranged outside the compost bin 2 and in communication with the compost bin 2 to suck and filter the gas inside the compost bin 2, and the stirring mechanism 1 in Embodiment One. Figures 1-2 As shown, the device comprises a compost bin 2, a filtering mechanism 3 arranged outside the compost bin 2 and in communication with the compost bin 2 to suck and filter the gas inside the compost bin 2, and the stirring mechanism 1 in Embodiment One. By hingedly connecting the stirring arm 13 to the side wall of the stirring main shaft 11 and connecting the scraping member 14 to the other end of the stirring arm 13, the stirring arm 13 can expand outward under the centrifugal force when the stirring main shaft 11 rotates, so that the stirring range of the stirring main shaft 11 in the central region of the compost bin 2 can be expanded to the entire interior of the compost bin 2, the material close to the inner side wall of the compost bin 2 can be fully stirred to avoid clumping, and the material adhered to the inner side wall of the compost bin 2 can be scraped off by the scraping member 14 at the end, so that the material inside the compost bin 2 can be fully exposed to oxygen for aerobic fermentation. The gas inside the compost bin 2 can be filtered by the filtering mechanism 3 to reduce the odor inside the compost bin 2.

[0023] In some embodiments, the compost bin 2 is open at the top and connected with a cover 21, so that the user can put the kitchen waste into the compost bin 2 by opening the cover 21 and make the kitchen waste perform aerobic fermentation inside the compost bin 2.

[0024] In some embodiments, the filtering mechanism 3 comprises a gas collecting air duct 31 and a condensing unit 32. The gas collecting air duct 31 is arranged around the circumferential side wall of the compost bin 2. A plurality of gas inlets are formed between the gas collecting air duct 31 and the circumferential side wall of the compost bin 2 to communicate the gas collecting air duct 31 with the interior of the compost bin 2. An outlet is arranged at the end of the gas collecting air duct 31. The gas inlet of the condensing unit 32 is communicated with the outlet of the gas collecting air duct 31. A gas pump is arranged between the gas inlet of the condensing unit 32 and the outlet of the gas collecting air duct 31 to deliver the gas in the gas collecting air duct 31 to the condensing unit 32. The condensing unit 32 can condense and discharge the easily liquefiable components in the gas. The outlet of the condensing unit 32 is communicated with the interior of the compost bin 2 or the outside through an outlet air duct. The gas in the compost bin 2 is sucked into the gas collecting air duct 31 by the gas pump and further delivered to the condensing unit 32, so that a negative pressure state is maintained in the compost bin 2. When the cover 21 is closed on the top of the compost bin 2 or when the cover 21 is opened, the outside air is sucked into the compost bin 2 and the leakage of the gas in the compost bin 2 to the outside is reduced, so that the odor in the compost bin 2 is prevented from spreading. The odor gas such as ammonia and hydrogen sulfide generated in the compost bin 2 is condensed and liquefied when passing through the condensing unit 32. The liquid is collected, and the odor-free gas is delivered to the interior of the compost bin 2 or the outside, so that the odor of the gas is removed by physical phase change.

[0025] In some embodiments, a dust filter screen and an activated carbon filter screen are arranged in sequence along the direction of the gas flow on the outlet air duct. The activated carbon filter screen further adsorbs the odor gas in the gas. The dust filter screen arranged in front of the activated carbon filter screen filters the dust in the gas first, so as to prolong the service life of the activated carbon filter screen.

[0026] In some embodiments, the aerobic composting device further comprises a screening mechanism 4, a solid compost collecting box 5 and a liquid compost collecting box 6. The screening mechanism 4 comprises a screening disc 41 arranged at the bottom of the compost bin 2, and a plurality of screening holes are formed in the screening disc 41. The screening disc 41 is movable to allow the materials with a particle size smaller than the screening holes to fall through the screening holes to the bottom of the screening disc 41. The solid compost collecting box 5 is arranged at the bottom of the screening disc 41 to collect the falling materials. The liquid compost collecting box 6 is arranged at the bottom of the solid compost collecting box 5. The liquid in the solid compost collecting box 5 can flow into the liquid compost collecting box 6. The liquid compost collecting box 6 is also in communication with the liquid outlet of the condensing unit 32 to collect the condensed liquid discharged from the condensing unit 32. After the materials in the compost bin 2 are fully stirred and aerobically fermented, part of the materials in the compost bin 2 will be completely decomposed into loose compost. The screening disc 41 is moved to allow the loose compost with a smaller particle size to fall through the screening holes into the solid compost collecting box 5 for easy access to the solid compost. The materials that have not been completely decomposed are still left on the top of the screening disc 41. The liquid in the solid compost collecting box 5 is collected into the liquid compost collecting box 6 by arranging the liquid compost collecting box 6 at the bottom of the solid compost collecting box 5. The condensed liquid discharged from the condensing unit 32 is also collected into the liquid compost collecting box 6 for easy access to the liquid compost. In some embodiments, the bottom surface of the solid compost collecting box 5 is a solid-liquid separation membrane to further flow the liquid into the liquid compost collecting box 6.

[0027] In some embodiments, the aerobic composting device further comprises a housing 7. The compost bin 2 and the screening mechanism 4 are arranged inside the housing 7. The solid compost collecting box 5 and the liquid compost collecting box 6 are slidably connected to the housing 7 so that the user can pull out the solid compost collecting box 5 and the liquid compost collecting box 6 from the housing 7. In some embodiments, a first sealing strip is arranged on the circumferential edge of the outer side wall of the solid compost collecting box 5. When the solid compost collecting box 5 is inserted in place, the sealing strip can prevent the gas or liquid in the housing 7 from leaking. A second sealing strip is also arranged on the circumferential edge of the outer side wall of the liquid compost collecting box 6. When the liquid compost collecting box 6 is inserted in place, the second sealing strip can prevent the gas or liquid in the housing 7 from leaking.

[0028] In some embodiments, a temperature sensor and a humidity sensor are arranged inside the compost bin 2. The essence of aerobic fermentation is the process of microbial decomposition of organic matter. The activity of microorganisms directly depends on the optimal temperature and humidity conditions of composting, i.e. the temperature is 55-65℃ and the humidity is 55%-65%. The temperature and humidity inside the compost bin 2 are monitored by the temperature sensor and the humidity sensor to determine whether the temperature and humidity are within the range of optimal temperature and humidity conditions for the best activity of microorganisms.

[0029] In some embodiments, the axial center of the screening disc 41 is connected to the output shaft of the second drive device, which drives the screening disc 41 to rotate around the axial center, causing the screening disc 41 to move along with the material above it, thus causing the smaller-sized, loosely crushed compost above the screening disc 41 to fall through the screening holes. In some embodiments, multiple small protrusions are fixedly provided on the top of the screening disc 41 to increase the friction between the screening disc 41 and the material in the compost bin 2 during its movement. In some embodiments, the second drive is located at the bottom of the screening disc 41 to avoid affecting the operation of the stirring mechanism 1 at the top of the screening disc 41.

[0030] In some embodiments, the circumferential edge of the screening disc 41 is slidably sealed to the bottom of the compost bin 2, the shaft is hinged to the bottom of the compost bin 2, and a vibrator is fixedly connected to the screening disc 41. The vibrator can make the circumferential edge of the screening disc 41 move up and down around the shaft to cause the small-sized, fragmented compost above the screening disc 41 to fall through the screening holes.

[0031] In some embodiments, the solid fertilizer collection box 5 and the liquid fertilizer collection box 6 are provided with transparent observation windows so that users can observe the solid fertilizer production in the solid fertilizer collection box 5 and the liquid fertilizer production in the liquid fertilizer collection box 6.

[0032] In some embodiments, the sidewalls of the compost bin 2 are wound with heating wires, which can heat the interior of the compost bin 2. Water mist nozzles are also provided on the circumferential edge of the top of the compost bin 2 to spray water mist into the interior of the compost bin 2 to increase the humidity inside the compost bin 2.

[0033] In some embodiments, the aerobic composting device further includes a controller. The controller is signal-connected to the first drive unit 15, the air pump, the condenser unit 32, the second drive unit, the temperature sensor, and the humidity sensor. The user can control the start and stop of the first drive unit 15, the air pump, the condenser unit 32, and the second drive unit through the controller, and receive temperature and humidity data monitored by the temperature and humidity sensors through the controller. In some embodiments, the aerobic composting device is also signal-connected to a heating wire and a water mist nozzle. The user can control the heating wire to turn on or off based on the temperature data monitored by the temperature sensor, and control the water mist nozzle to turn on or off based on the data from the humidity sensor. In some embodiments, a weight sensor is also integrated inside the screening disc 41. The weight sensor is signal-connected to the controller to receive the weight data of the material inside the composting bin 2 through the controller.

[0034] Example 3 This embodiment provides an aerobic composting method, including the following steps: Start the first drive device 15 to make the stirring main shaft 11 rotate around its own axis. The material in the compost bin 2 is conveyed upward along the stirring main shaft 11 by the spiral stirring blades 12. At the same time, the stirring arm 13 rotates horizontally around the hinge point under the action of centrifugal force to fully stir the material close to the inner wall of the compost bin 2. The scraper 14 abuts against the inner wall of the compost bin 2 to scrape off the material attached to the inner wall of the compost bin 2 so that the material in the compost bin 2 can fully contact oxygen for aerobic fermentation. The filter mechanism 3 is activated, and the air pump draws the gas inside the composting bin 2 into the gas collection duct 31 and further delivers it to the condensation unit 32, so that the composting bin 2 is kept under negative pressure. By further drawing the gas in the gas collection duct 31 into the condensation unit 32, the gas that produces odor in the composting bin 2 is condensed and liquefied. This liquid is collected and introduced into the liquid fertilizer collection box 6. The gas after removing the odor is then introduced into the composting bin 2 or into the outside, thereby removing the odor of the gas through physical phase change. The gas, after odor removal, is further filtered through a dust filter and an activated carbon filter. Temperature and humidity are monitored in composting bin 2 by temperature and humidity sensors, and the heating wire and water mist nozzle are turned on or off by controller to keep the temperature and humidity within the range of optimal temperature and humidity conditions for microbial activity. Start the screening mechanism 4 to make the screening disc 41 move, and the small-sized crushed compost falls through the screening holes into the solid fertilizer collection box 5 for easy access to solid fertilizer. The material that has not been completely decomposed remains on the top of the screening disc 41. The liquid inside the solid fertilizer collection box 5 can flow into the liquid fertilizer collection box 6 for easy access to liquid fertilizer.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A stirring mechanism characterized by: include: A stirring shaft is driven by a first driving device and is vertically coaxially arranged in the compost bin. Spiral stirring blades are arranged around the circumference of the stirring shaft. When the stirring shaft rotates around its own axis, the stirring blades can transport the material in the compost bin upward along the stirring shaft. as well as Multiple stirring arms are provided, one end of which is hinged to the side wall of the stirring main shaft, and the other end is connected to a scraper. When the stirring main shaft is stationary, the stirring wall hangs down naturally under the action of gravity. When the stirring main shaft rotates, the stirring arms rotate around the corresponding hinge point and extend outward under the action of centrifugal force, so that the scraper abuts against the inner side wall of the compost bin.

2. An aerobic composting apparatus, characterised in that: It includes a composting bin, a filtration mechanism, and a stirring mechanism as described in claim 1. The filtration mechanism is located outside the composting bin and communicates with the composting bin to draw in and filter the gas inside the composting bin.

3. The aerobic composting apparatus of claim 2, wherein: The filtration mechanism includes: A gas collecting duct is provided, which is arranged around the circumferential sidewall of the composting bin. Multiple air inlets are formed between the gas collecting duct and the circumferential sidewall of the composting bin to connect the gas collecting duct to the interior of the composting bin. An air outlet is provided at the end of the gas collecting duct. A condensation unit is provided, with its air inlet connected to the air outlet of the gas collecting duct. An air pump is installed between the air inlet of the condensation unit and the air outlet of the gas collecting duct to transport the gas inside the gas collecting duct to the condensation unit. The condensation unit can condense and discharge the easily liquefied components in the gas. The air outlet of the condensation unit is connected to the outside through the air outlet duct.

4. The aerobic composting apparatus of claim 3, wherein: A dust filter and an activated carbon filter are sequentially arranged along the airflow direction on the air outlet duct.

5. The aerobic composting apparatus of claim 4, wherein: It also includes a screening mechanism, which comprises: A screening disc is disposed at the bottom of the compost bin. The screening disc has multiple screening holes and can move to allow materials with a particle size smaller than the screening holes in the compost bin to pass through the screening holes and fall to the bottom of the screening disc. A solid fertilizer collection box, wherein the solid fertilizer collection box is disposed at the bottom of the screening disc to collect falling material; and A liquid fertilizer collection box is located at the bottom of the solid fertilizer collection box. Liquid inside the solid fertilizer collection box can flow into the liquid fertilizer collection box. The liquid fertilizer collection box is also connected to the liquid outlet of the condensation unit to collect the condensed liquid discharged by the condensation unit.

6. The aerobic composting apparatus of claim 5, wherein: Temperature and humidity sensors are also installed inside the composting bin.

7. The aerobic composting apparatus of claim 6, wherein: The sieving disc is connected to the output shaft of the second drive device at its axis, and the second drive device can drive the sieving disc to rotate around the axis.

8. The aerobic composting apparatus of claim 6, wherein: The solid fertilizer collection box and the liquid fertilizer collection box are provided with transparent observation windows.

9. The aerobic composting apparatus of claim 7, wherein: It also includes a controller, which is signal-connected to the first drive device, the air pump, the condenser unit, the second drive device, the temperature sensor, and the humidity sensor.

10. An aerobic composting method characterized by: Includes the following steps: The first driving device is started to rotate the stirring spindle around its own axis, and the material in the compost bin is conveyed upwards along the stirring spindle by the helical stirring blades, and the stirring wall rotates around the hinge point towards the horizontal direction under the action of centrifugal force, and the scraping member abuts against the inner side wall of the compost bin to scrape the material attached to the inner side wall of the compost bin; The filtering mechanism is started to suck and filter the gas in the compost bin.

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