A device for drying down down feather twice

Abstract

The utility model discloses a kind of down secondary drying device, belong to down processing technical field.Organic frame, be installed on the top of rack and be used to roll down the rolling assembly, be installed on the rack and be located under the rolling assembly and be used to heat the heating assembly for rolling assembly, be installed on the rack and be located at the one end of rolling assembly and be used to the material guiding assembly for feeding to the inside of rolling assembly, be installed on the one side of material guiding assembly and be used to the air-blowing assembly for blowing to the inside of rolling assembly.The utility model realizes the efficient fluffy processing of down, significantly improve the fluffiness and quality of down, provide high-quality raw material basis for subsequent down processing.

Description

Technical Field

[0001] This utility model relates to the field of down processing technology, and more specifically to a down secondary drying device. Background Technology

[0002] Down, as a high-quality insulating material, is widely used in clothing, bedding, and other fields. The loft of down is one of the important indicators for measuring its insulating performance; the higher the loft, the better the insulation effect. In the down processing process, how to improve the loft of down has always been a key research focus in the industry.

[0003] Currently, down fluffing treatment methods mainly include washing, drying, and electrostatic treatment. Traditional down treatment methods typically use high-temperature drying, which can quickly remove moisture from the down, but high temperatures can easily denature down proteins, affecting the down's elasticity and loft. However, existing down treatment methods still have some problems. Traditional one-time down drying methods, while superficially drying the down, result in only a weak loft, making them prone to problems during transportation and storage. Current washing temperatures are generally high, easily leading to down protein denaturation; improper temperature control during drying can affect the down's loft; unreasonable electrostatic treatment parameters can result in excessive or insufficient charge on the down, affecting subsequent processing; and the temperature and time control during drying is not precise enough to achieve optimal loft. Furthermore, existing technologies lack systematic optimization of the entire down pretreatment process, and the connections between different steps are not tight enough, resulting in limited improvement in loft and insufficient durability of the loft effect.

[0004] Therefore, there is an urgent need for a down secondary drying device that can effectively improve the loft of down and maintain its durability, in order to solve the problems existing in the current technology. Utility Model Content

[0005] To address the technical problem that existing disposable down drying methods, while superficially drying the down, result in only a weak loft and are prone to problems during transportation and storage, this invention provides a down pretreatment lofting method and apparatus to achieve better down core expansion, improved down elasticity, superior loft, greater resilience, and fuller down core.

[0006] To achieve the above objectives, this utility model employs the following technical means: This utility model provides a down secondary drying device, comprising a low-temperature washing component, a low-temperature vacuum drying component, a first humidifying component, an electrostatic treatment component, and a second humidifying component arranged in sequence. The device is characterized by further comprising a secondary drying unit, which includes a frame, a rolling assembly mounted on top of the frame for rolling down, a heating assembly mounted on the frame and located below the rolling assembly for heating the rolling assembly, a guide assembly mounted on the frame and located at one end of the rolling assembly for feeding material into the rolling assembly, and a blower assembly mounted on one side of the guide assembly for blowing air into the rolling assembly.

[0007] In some embodiments, the rolling assembly includes a roller, a protective cover mounted on a frame and located outside the roller, and a heat conduction port mounted on the frame and located below the roller and cooperating with the protective cover to surround the roller. The roller is movably mounted on the frame via a roller assembly. A drive motor mounted on the frame and connected to the roller assembly is provided on one side of the roller for driving the roller to rotate. The discharge end of the roller is detachably equipped with a material blocking structure for material blocking.

[0008] In some embodiments, the roller is inclined and includes a first outer cylinder. A second outer cylinder, coaxial with the first outer cylinder, is disposed in the internal gap of the first outer cylinder. A plurality of vent holes are uniformly opened on the first outer cylinder, and a plurality of guide vanes for guiding flow are uniformly disposed on the inner wall of the second outer cylinder.

[0009] In some embodiments, the heating assembly includes a heating chamber, the top of which is connected to a heat-conducting port via a heat-conducting pipe.

[0010] Compared with the prior art, the present invention has the following beneficial effects: Compared with existing technologies, this invention achieves efficient fluffing treatment of down, significantly improving the fluffiness and quality of down, and providing a high-quality raw material base for subsequent down processing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the product structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the product structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of a portion of the product structure according to an embodiment of this utility model; Figure 4 This is a schematic diagram of a portion of the product structure according to an embodiment of this utility model; Figure 5 This is a schematic diagram of a portion of the product structure according to an embodiment of this utility model; Figure 6 This is a top view of a portion of the product structure according to an embodiment of the present utility model; Figure 7 The product of this utility model embodiment is along Figure 6 Schematic diagram of the AA section structure. Detailed Implementation

[0012] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. The following embodiments and drawings are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. The drawings only schematically show the parts related to the technical solution of this application, and do not represent their actual structure as a product.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0014] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0015] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0016] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0017] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0018] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0019] In this embodiment, a method for pre-treating down to increase its fluffiness is provided, including the following steps: Step 1: Low-temperature washing treatment; The down feathers are placed in a washing machine for low-temperature washing, with the temperature controlled within the range of 30-40℃ during the washing process. In some or possible embodiments of this invention, the temperature is 32℃. In some or possible embodiments of this invention, the temperature is 35℃. In some or possible embodiments of this invention, the washing time is controlled within 30-40 minutes. In some or possible embodiments of this invention, the washing time is 35 minutes. Low-temperature washing can effectively remove stains and impurities from the surface of the down feathers, while avoiding damage to the down fibers from high temperatures, thus maintaining the fluffiness and elasticity of the down feathers.

[0020] Step 2: Low-temperature vacuum drying; After low-temperature washing, the down is transferred to a vacuum drying device for low-temperature vacuum drying. The temperature is controlled between -20°C and 0°C during the drying process. In some or possible embodiments of this invention, the temperature is controlled at -10°C. In some or possible embodiments of this invention, the vacuum degree is controlled within the range of 10-30 Pa. In some or possible embodiments of this invention, the vacuum degree is 20 Pa. In some or possible embodiments of this invention, the vacuum drying time is 1-3 hours. In some or possible embodiments of this invention, the vacuum drying time is 2 hours. After this step, the moisture content of the down is controlled within the range of 10-20%. In some or possible embodiments of this invention, the moisture content of the down is 15%. Low-temperature vacuum drying can remove most of the moisture without damaging the down structure, preparing it for subsequent processing.

[0021] Step 3: Static electricity treatment; Down that has undergone low-temperature vacuum drying is placed in an electrostatic treatment device for electrostatic treatment. In some or possible embodiments of this invention, the voltage range for electrostatic treatment is 0.8-5KV. In some or possible embodiments of this invention, the voltage is 3KV. In some or possible embodiments of this invention, the electrostatic power is 100-3000W. In some or possible embodiments of this invention, the electrostatic power is 500W. In some or possible embodiments of this invention, the electrostatic power is 1200W. In some or possible embodiments of this invention, the electrostatic power is 1500W. In some or possible embodiments of this invention, the electrostatic treatment time is 20-60 minutes. In some or possible embodiments of this invention, the electrostatic treatment time is 40 minutes. Through electrostatic treatment, the down fibers become charged, causing them to repel each other, thereby increasing the loft and filling power of the down, facilitating subsequent humidification treatment, and creating conditions for higher loft.

[0022] Step 4: Humidification treatment; The down, after electrostatic treatment, is humidified to achieve a moisture content of 15-25%. In some or possible embodiments of this invention, the moisture content of the down is 20%. Humidification in a tubular container can regulate the humidity of the down, creating suitable drying conditions for subsequent drying, and also further improving the loft of the down.

[0023] Step 5: Secondary drying process; The humidified down feathers are then sent to a secondary drying unit for drying, and the drying process is divided into two stages: Phase 1: Primary Drying; Control the amount of down to no more than 30 kg, and use a temperature of 90-100℃ for primary drying, with a drying time of 6-10 minutes. When the down moisture content reaches 80%, let it stand for 2-5 minutes to allow the heat to be evenly distributed.

[0024] Second stage: Thorough drying; Dry thoroughly at a temperature of 120-130℃ for 4-6 minutes, preferably 5 minutes.

[0025] The two-stage drying process described above ensures that the down is thoroughly dried. Furthermore, treatment at different temperatures can further enhance the loft and resilience of the down, thereby improving its quality.

[0026] Down treated using this method exhibits significantly improved loft, enhanced filling power, a softer hand feel, and better resilience, making it suitable for the production of high-quality down products. Low-temperature washing and low-temperature vacuum drying protect the original structure of the down, while electrostatic treatment causes the down fibers to repel each other, increasing loft. Humidification and secondary drying further optimize the physical properties of the down and improve its loft.

[0027] In some or possible embodiments of this utility model, the down pretreatment fluffing device includes a low-temperature washing component, a low-temperature vacuum drying component, a first humidification component, an electrostatic treatment component, a second humidification component, and a secondary drying device arranged sequentially. The low-temperature washing component, the low-temperature vacuum drying component, the first humidification component, the electrostatic treatment component, and the second humidification component all utilize existing technology and equipment.

[0028] In some or possible embodiments of this utility model, the low-temperature washing component is used to perform low-temperature cleaning of down, removing impurities and stains from the surface of the down. Low-temperature washing ensures that the quality of the down is not damaged. The low-temperature washing component uses existing equipment and is equipped with a water circulation system and a temperature control system, which can precisely control the washing temperature and time to ensure that the fiber structure of the down is not damaged by high temperatures during the washing process.

[0029] In some or possible embodiments of this invention, the low-temperature vacuum drying component is located behind the low-temperature washing component and is used to perform vacuum drying on the washed, damp down. The low-temperature vacuum drying component enables rapid drying of the down at a lower temperature, avoiding damage caused by high temperatures. In some or possible embodiments of this invention, the low-temperature vacuum drying component employs existing technology and is equipped with a vacuum pump and heating elements, enabling efficient drying while maintaining a low temperature.

[0030] In some or possible embodiments of this invention, the first humidifying component is located behind the low-temperature vacuum drying component and is used to perform preliminary humidification treatment on the dried down. Specifically, the first humidifying component sprays an appropriate amount of water onto the down through a spray system, allowing the down fibers to absorb a certain amount of moisture in preparation for subsequent electrostatic treatment. In some or possible embodiments of this invention, the first humidifying component uses existing equipment, which includes a humidity sensor and a precisely controlled spray device, enabling adjustment of the humidification amount according to the dryness of the down.

[0031] In some or possible embodiments of this invention, the electrostatic treatment component is located behind the first humidification component and is used to perform electrostatic treatment on the humidified down. In some or possible embodiments of this invention, the electrostatic treatment component generates an electrostatic field that causes repulsive forces between the down fibers, thereby dispersing the down fibers and increasing the loft of the down. In some or possible embodiments of this invention, the electrostatic treatment component uses existing equipment, which includes an electrostatic generator and a conductive mesh inside, enabling it to uniformly apply an electrostatic field to the down and ensure that the down receives electrostatic treatment.

[0032] In some or possible embodiments of this invention, the second humidifying component is located behind the electrostatic treatment component and is used to further humidify the down after electrostatic treatment. In some or possible embodiments of this invention, the second humidifying component sprays an appropriate amount of water onto the down, allowing the down fibers to absorb a certain amount of moisture, preparing for subsequent drying. In some or possible embodiments of this invention, the second humidifying component uses existing conventional equipment, which includes a humidity sensor and a precisely controlled spray device, capable of adjusting the humidification amount according to the condition of the down.

[0033] In some or possible embodiments of this utility model, the secondary drying device is used to perform final drying and fluffing treatment on the down that has undergone the aforementioned treatment. In some or possible embodiments of this utility model, the secondary drying device includes a frame 100, a rolling assembly 200 mounted on the top of the frame 100 for rolling the down, a heating assembly 300 mounted on the frame 100 and located below the rolling assembly 200 for supplying heat to the rolling assembly 200, a guide assembly 400 mounted on the frame 100 and located at one end of the rolling assembly 200 for feeding material into the rolling assembly 200, and a blower assembly 500 mounted on one side of the guide assembly 400 for blowing air into the rolling assembly 200.

[0034] In some or possible embodiments of this utility model, the frame 100 is made of metal material, possessing sufficient strength and stability. In some or possible embodiments of this utility model, the rolling assembly 200 is mounted on the top of the frame 100 for rolling down feathers. In some or possible embodiments of this utility model, the heating assembly 300 is mounted on the frame 100 and located below the rolling assembly 200 for supplying heat to the rolling assembly 200.

[0035] In some or possible embodiments of this utility model, the rolling assembly 200 includes a roller 210, a protective cover 220 mounted on the frame 100 and located outside the roller 210, and a heat-conducting port 230 mounted on the frame 100 and located below the roller 210, which cooperates with the protective cover 220 to surround the roller 210. The roller 210 is movably mounted on the frame 100 via a roller assembly 240. A drive motor 250 mounted on the frame 100 and connected to the roller assembly 240 is provided on one side of the roller 210 to drive the roller 210 to rotate. The discharge end of the roller 210 is detachably equipped with a blocking structure 260 for blocking material. In some or possible embodiments of this utility model, the roller 210 is used to drive the down to tumble during the rotation of the roller 210, so that the down can be heated evenly. The roller 210 has an inlet and an outlet at both ends. The inlet is connected to the guide assembly 400, and the outlet is used to discharge the processed down. It is also detachably equipped with a blocking structure 260.

[0036] In some or possible embodiments of this utility model, the roller 210 is inclined and includes a first outer cylinder 211. A second outer cylinder 212 coaxial with the first outer cylinder 211 is provided in the internal gap of the first outer cylinder 211. A plurality of sets of vent holes 213 are evenly opened on the first outer cylinder 211. A plurality of guide vanes 214 for guiding flow are evenly provided on the inner wall of the second outer cylinder 212.

[0037] In some or possible embodiments of this utility model, the protective cover 220 is mounted on the frame 100 and located outside the roller 210, for protecting and insulating the roller 210. The protective cover 220 is made of high-temperature resistant material, which can effectively prevent heat loss and protect operators from direct contact with high-temperature components. The protective cover 220 is semi-cylindrical, covering the upper half of the roller 210, and is fixedly connected to the frame 100 by bolts.

[0038] In some or possible embodiments of this utility model, the heat conduction port 230 is mounted on the frame 100 and located below the roller 210, cooperating with the protective cover 220 to surround the roller 210. The heat conduction port 230 is used to guide and control heat distribution, ensuring that the down inside the roller 210 is heated evenly. In some or possible embodiments of this utility model, the heat conduction port 230 is made of metal material, and a relatively closed hot air circulation system is formed between the heat conduction port 230 and the protective cover 220, improving the efficiency of heat energy utilization.

[0039] In some or possible embodiments of this invention, the idler roller assembly 240 is used to support the roller 210 and enable it to rotate. The idler roller assembly 240 includes a plurality of idler rollers evenly distributed below the roller 210 and in contact with the outer wall of the roller 210. The idler rollers are made of wear-resistant material with a smooth surface, reducing frictional resistance with the roller 210. The idler rollers are connected to the frame 100 via bearings to ensure flexible rotation.

[0040] In some or possible embodiments of this utility model, the drive motor 250 is mounted on the frame 100, located on one side of the roller 210, and is connected to the roller assembly 240 for driving the roller 210 to rotate. The drive motor 250 is a variable frequency motor, which can adjust the speed according to different down types and processing requirements. As shown in the figure, the drive motor 250 is connected to the roller assembly 240 through a drive shaft to form a transmission system. The power of the drive motor 250 can be selected according to the capacity and load requirements of the roller 210 to ensure that sufficient power is provided to make the roller 210 rotate smoothly.

[0041] In some or possible embodiments of this utility model, the material blocking structure 260 is detachably installed at the discharge end of the roller 210 for blocking material. In some or possible embodiments of this utility model, the material blocking structure 260 has a convex structure and engages with the inner wall of the roller 210, completely blocking the discharge port of the roller 210. The material blocking structure 260 is made of the same material as the roller 210, ensuring that it does not deform under high temperature conditions, and can easily control the residence time of down in the roller 210, thereby adjusting the processing effect.

[0042] In some or possible embodiments of this utility model, the heating assembly 300 includes a heating chamber 310, the top of which is connected to a heat-conducting port 230 via a heat-conducting pipe 320. In some or possible embodiments of this utility model, the heating chamber 310 is equipped with a heating wire and a hot air circulation system. The heating wire generates heat when energized, and the hot air circulation system evenly distributes the heat and transfers it upwards to the rolling assembly 200. In some or possible embodiments of this utility model, the heating assembly 300 is equipped with a temperature sensor and a control system, which can precisely adjust the temperature as needed to ensure that the down is dried at a suitable temperature, achieving a good drying effect without damaging the down fibers due to excessive temperature. Correspondingly, the rolling assembly 200 is also equipped with a temperature sensor to monitor the internal temperature of the drum 210.

[0043] In some or possible embodiments of this utility model, the heating assembly 300 includes a heating chamber 310, the top of which is connected to a heat-conducting port 230 via a heat-conducting pipe 320. In some or possible embodiments of this utility model, the heating chamber 310 is a closed cavity with heat-insulating properties, effectively concentrating heat in the internal space. The bottom of the heating chamber 310 is provided with a heating element, which may be an electric heating wire, an infrared heating tube, or other heating device, for generating heat. The sidewalls of the heating chamber 310 are made of high-temperature resistant material to ensure that it will not deform or be damaged under high-temperature operating conditions.

[0044] In some or possible embodiments of this utility model, the top of the heating chamber 310 has a rectangular opening to facilitate uniform upward heat conduction. The heat-conducting pipe 320 is a hollow rectangular tubular structure made of a metal material with good thermal conductivity, such as aluminum alloy, which can quickly transfer heat from the heating chamber 310 to the heat-conducting port 230. The lower end of the heat-conducting pipe 320 is tightly fitted with the connection port at the top of the heating chamber 310, while its upper end is connected to the heat-conducting port 230.

[0045] In some or possible embodiments of this utility model, the material guiding assembly 400 is mounted on the frame 100 and located at one end of the rolling assembly 200, for feeding material into the rolling assembly 200. In some or possible embodiments of this utility model, as shown in the figure, the material guiding assembly 400 includes a curved feed hopper 410 that extends into the roller 210, ensuring that down can smoothly enter the roller 210 of the rolling assembly 200.

[0046] In some or possible embodiments of this utility model, the blower assembly 500 is installed on one side of the guide assembly 400 and is used to blow air into the rolling assembly 200. In some or possible embodiments of this utility model, the blower assembly 500 includes a fan 510. The airflow generated by the fan 510 is introduced into the rolling assembly 200 through an air duct, and combines with the heat generated by the heating assembly 300 to form hot air, which dries and fluffs the down. The wind speed of the blower assembly 500 can be adjusted according to the processing requirements of the down, ensuring that the down can fully contact the hot air during the drying process without being blown away or damaged due to excessive wind speed.

[0047] In the process of fluffing down, the down first undergoes washing in a low-temperature washing unit, followed by preliminary drying in a low-temperature vacuum drying unit. Next, it sequentially passes through a first humidification unit, an electrostatic treatment unit, and a second humidification unit for humidification and electrostatic treatment, finally entering a secondary drying unit. In the secondary drying unit, the down enters the rolling assembly 200 via the guide assembly 400. Inside the rolling assembly 200, the down tumbles continuously as the drum 210 rotates. Simultaneously, the heat generated by the heating assembly 300 and the airflow generated by the blower assembly 500 work together to thoroughly dry the down and restore its fluffiness. The processed down is then discharged from the outlet of the rolling assembly 200, completing the entire pre-treatment fluffing process.

[0048] During operation, the down to be treated enters the drum 210 through the inlet. Due to the tilting and rotation of the drum 210, the down slowly moves along its inner wall towards the outlet. Simultaneously, guide vanes 214 on the inner wall of the second outer drum 212 continuously tumble the down, ensuring it is fully loosened. Hot air enters the drum 210 through the vents 213 on the first outer drum 211, coming into full contact with the down to accelerate moisture evaporation and increase its loft. The treated down is then discharged from the outlet, completing the pre-treatment and fluffing process.

[0049] This down secondary drying device achieves efficient fluffing treatment of down through the synergistic effect of the inclined roller 210, the double-layer cylinder, the air vents 213, and the guide vanes 214. It significantly improves the fluffiness and quality of down, providing a high-quality raw material base for subsequent down processing.

[0050] Through this sequential processing method, the down feathers, after undergoing complete pre-treatment and fluffing, can achieve ideal dryness and loft, providing high-quality raw materials for subsequent down product manufacturing.

[0051] The specific embodiments disclosed in this utility model fall within the protection scope of the claims of this utility model and are specific subordinate implementations of the characteristic parts of this utility model. The protection content of the specific embodiments is merely an explanation of the protection scope of the claims of this utility model. The protection scope of this utility model is not limited to the protection content of the specific embodiments, and the protection content of the specific embodiments should not be construed as a limitation on the protection scope of the claims of this utility model. All product structural connection relationships falling within the protection scope of this utility model are also within the protection scope of this utility model. Conventional technical improvements to the structure of product components without departing from the essence of this utility model, such as the improvements to the structure of some parts of the product as described in the specific embodiments of this utility model, will also fall within the protection scope of this utility model.

Claims

1. A down secondary drying device, comprising a low-temperature washing component, a low-temperature vacuum drying component, a first humidifying component, an electrostatic treatment component, and a second humidifying component arranged sequentially, characterized in that: It also includes a secondary drying device, which includes a frame, a rolling assembly mounted on top of the frame for rolling down feathers, a heating assembly mounted on the frame and located below the rolling assembly for heating the rolling assembly, a material guide assembly mounted on the frame and located at one end of the rolling assembly for feeding material into the rolling assembly, and a blower assembly mounted on one side of the material guide assembly for blowing air into the rolling assembly.

2. The down secondary drying device according to claim 1, characterized in that: The rolling assembly includes a roller, a protective cover mounted on the frame and located outside the roller, and a heat conduction port mounted on the frame and located below the roller, which cooperates with the protective cover to surround the roller. The roller is movably mounted on the frame via a roller support assembly. A drive motor mounted on the frame and connected to the roller support assembly is provided on one side of the roller to drive the roller to rotate. The discharge end of the roller is detachably equipped with a material blocking structure for material blockage.

3. The down secondary drying device according to claim 2, characterized in that: The roller is inclined and includes a first outer cylinder. A second outer cylinder, coaxial with the first outer cylinder, is provided in the internal gap of the first outer cylinder. Several sets of vent holes are evenly opened on the first outer cylinder, and several guide vanes for guiding flow are evenly arranged on the inner wall of the second outer cylinder.

4. The down secondary drying device according to claim 1, characterized in that: The heating assembly includes a heating chamber, the top of which is connected to a heat-conducting port via a heat-conducting pipe.

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