A drum-type low-pressure superheated steam drying apparatus for drying forage
By using a drum-type low-pressure superheated steam dryer, superheated steam is brought into uniform contact with the forage, solving the problems of slow drying rate and oxidation in hot air dryers, and achieving efficient and low-cost forage drying.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA AGRICULTURAL UNIVERSITY
- Filing Date
- 2025-04-27
- Publication Date
- 2026-06-05
AI Technical Summary
Existing hot air drying equipment has a slow drying rate, and forage is easily damaged by oxidation.
The device employs a drum-type low-pressure superheated steam dryer, which uses a steam generator to produce superheated steam and drives the inner drum to rotate via a rotating shaft, ensuring that the superheated steam comes into uniform contact with the forage. Combined with a chain drive system, the drying efficiency is improved.
It increases the drying rate, prevents forage oxidation, improves drying quality, and reduces costs.
Smart Images
Figure CN224327476U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of forage drying technology, specifically relating to a drum-type low-pressure superheated steam drying device for drying forage. Background Technology
[0002] Natural grasslands are important production materials for grassland animal husbandry. The moisture content of harvested forage is about 70%-85%. In order to meet the requirements of safe storage and deep processing, the harvested forage needs to be dried to quickly reduce the moisture content of the forage to 15%-18% and minimize the loss of most nutrients during the drying process.
[0003] Common forage drying equipment typically consists of a drying chamber and a hot air blower. The drying chamber holds the forage, and the hot air blower is connected to it, generating and outputting hot air into the drying chamber. This structure utilizes heat and mass exchange between the hot air and the forage within the drying chamber to achieve dehydration and drying. However, hot air drying has a relatively slow drying rate, and the forage is prone to quality damage due to oxidation. Utility Model Content
[0004] To address the aforementioned problems in the existing technology, this utility model provides a drum-type low-pressure superheated steam drying device for drying forage. The technical problem to be solved by this utility model is achieved through the following technical solution:
[0005] In the first aspect, this utility model provides a drum-type low-pressure superheated steam drying device for drying hay, including a frame, a cylinder and a steam generator. The cylinder includes an inner cylinder, an outer cylinder and a rotating shaft. The outer cylinder and the steam generator are both fixed on the frame. The inner cylinder is used to hold hay. The inner cylinder is located inside the outer cylinder and the two are coaxially arranged. The rotating shaft passes through the outer cylinder and the inner cylinder in sequence along the axial direction of the outer cylinder. The rotating shaft and the outer cylinder are rotatably connected, and the rotating shaft and the inner cylinder are fixedly connected.
[0006] The front end of the rotating shaft extends through the outer cylinder. A driven sprocket is installed at the front end of the rotating shaft. The driven sprocket and the rotating shaft are coaxially arranged and fixed at the front end of the rotating shaft. The frame is also equipped with a motor, a drive sprocket, and a chain. The motor includes a motor shaft. The drive sprocket and the motor shaft are coaxially arranged and fixed on the motor shaft. The chain meshes with both the drive sprocket and the driven sprocket. The diameter of the drive sprocket is smaller than the diameter of the driven sprocket, and the number of teeth on the drive sprocket is smaller than the number of teeth on the driven sprocket.
[0007] The steam generator is internally connected to the outer cylinder. The steam generator is used to generate superheated steam and deliver the superheated steam into the outer cylinder.
[0008] In one embodiment of this utility model, the frame includes a base frame, a support frame, a top frame, and a support plate;
[0009] The base frame includes a first longitudinal beam, a second longitudinal beam, a first crossbeam, a second crossbeam, and a third crossbeam. The first and second longitudinal beams are parallel to each other, as are the first, second, and second crossbeams. The two ends of the first crossbeam are welded to the front ends of the first and second longitudinal beams, respectively. The two ends of the second crossbeam are welded to the rear ends of the first and second longitudinal beams, respectively. The two ends of the third crossbeam are welded to one end of the first and second longitudinal beams, respectively, and are located between the first and second crossbeams. The two ends of the outer cylinder are welded to the first and third crossbeams, respectively.
[0010] The top frame includes a front beam, a left beam, a rear beam, and a right beam that are connected in sequence and form a rectangular frame. The support frame includes four support columns, which are respectively located at both ends of the first and third crossbeams, and the two ends of the support columns are welded to the bottom frame and the top frame, respectively.
[0011] The base frame is longer than the top frame. The support plate is welded to the front ends of the first and second longitudinal beams. The steam generator is installed on the support plate.
[0012] In one embodiment of this utility model, the frame further includes a first inclined support and a second inclined support, one end of the first inclined support is connected to the first longitudinal beam, and the other end of the first inclined support is connected to the outer cylinder;
[0013] One end of the second inclined support is connected to the second longitudinal beam, and the other end of the second inclined support is connected to the outer cylinder. Both the first and second inclined supports are inclined relative to the horizontal plane.
[0014] In one embodiment of this utility model, multiple first inclined supports are provided, and the multiple first inclined supports are arranged along the length direction of the first longitudinal beam;
[0015] Multiple second diagonal supports are provided, and these multiple second diagonal supports are arranged along the length direction of the second longitudinal beam.
[0016] In one embodiment of this utility model, a first wheel group and a second wheel group are also included;
[0017] The first wheel assembly includes a first wheel axle and two first traveling wheels disposed at both ends of the first wheel axle. The first wheel axle is fixedly connected to the base frame, and both first traveling wheels are rotatably connected to the first wheel axle.
[0018] The second wheel assembly includes a second wheel axle and two second traveling wheels located at both ends of the second wheel axle. The second wheel axle is fixedly connected to the base frame, and both second traveling wheels are rotatably connected to the second wheel axle.
[0019] In one embodiment of this utility model, the upper part of the outer cylinder is provided with a feed inlet, which is located at the front end of the outer cylinder.
[0020] In one embodiment of this utility model, the lower end of the outer cylinder is provided with a discharge port, which is located at the rear end of the outer cylinder and has a conical structure.
[0021] In one embodiment of this utility model, the base frame is further provided with a pedal assembly, which includes a first vertical rod, a second vertical rod, and a pedal. The first vertical rod and the second vertical rod are parallel to each other and are both welded to the first longitudinal beam. The two sides of the pedal are respectively welded to the first vertical rod and the second vertical rod.
[0022] In one embodiment of this utility model, a conveying pipe is provided on the cylinder body. The conveying pipe is welded to the outer cylinder, and one end of the conveying pipe is connected to the inside of the outer cylinder, while the other end is connected to the steam generator.
[0023] In one embodiment of this utility model, a spiral stirring blade is provided on the rotating shaft.
[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0025] In the above-described scheme of this application, the drum-type low-pressure superheated steam dryer for drying hay includes a frame, a cylinder, and a steam generator. The cylinder includes an inner cylinder, an outer cylinder, and a rotating shaft. The outer cylinder and the steam generator are both fixed to the frame. The inner cylinder is used to hold hay and is located inside the outer cylinder, with both cylinders coaxially arranged. The rotating shaft passes through the outer cylinder and the inner cylinder sequentially along the axial direction of the outer cylinder. The rotating shaft is rotatably connected to the outer cylinder and fixedly connected to the inner cylinder. The front end of the rotating shaft extends through the outer cylinder, and a driven chain is installed at the front end of the rotating shaft. The driven sprocket and the rotating shaft are coaxially arranged and fixed to the front end of the rotating shaft. The frame is also equipped with a motor, a drive sprocket and a chain. The motor includes a motor shaft, and the drive sprocket and the motor shaft are coaxially arranged and fixed on the motor shaft. The chain meshes with both the drive sprocket and the driven sprocket. The diameter of the drive sprocket is smaller than the diameter of the driven sprocket, and the number of teeth on the drive sprocket is smaller than the number of teeth on the driven sprocket. The steam generator is internally connected to the outer cylinder. The steam generator is used to generate superheated steam and deliver superheated steam into the outer cylinder. This structure, firstly, generates superheated steam through a steam generator and delivers it into the outer cylinder. The superheated steam inside the outer cylinder can then enter the inner cylinder and come into contact with the hay inside, allowing the superheated steam to dry the hay. Superheated steam drying offers numerous advantages, including a high heat transfer coefficient, good product quality after drying, and environmental protection. Compared to existing traditional hot air drying devices, using the device described in this application to dry hay increases the drying rate, prevents hay from easily oxidizing and causing quality damage, improves the dried hay quality, and reduces costs. Secondly, the motor in this application drives the drive sprocket to rotate. The rotation of the drive sprocket drives the driven sprocket to rotate via a chain. The rotation of the driven sprocket drives the shaft to rotate, which in turn drives the inner cylinder to rotate. The rotation of the inner cylinder moves the hay inside, resulting in more uniform contact between the hay and the superheated steam, further improving the dried hay quality.
[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the drying device in an embodiment of this utility model;
[0028] Figure 2 This is a schematic diagram of the cylinder in an embodiment of this utility model.
[0029] Reference numerals: 1-Frame, 11-Base frame, 12-Support frame, 13-Top frame, 14-First inclined support, 15-Pedal assembly, 2-Cylinder, 21-Inner cylinder, 22-Outer cylinder, 221-Inlet, 222-Outlet, 23-Rotating shaft, 231-Spiral stirring blade, 24-Conveying pipe, 3-Steam generator, 4-Driven sprocket, 5-Motor, 6-Drive sprocket, 7-Chain, 8-First wheel set, 9-Second wheel set. Detailed Implementation
[0030] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.
[0031] Please see Figure 1 and Figure 2 This utility model provides a drum-type low-pressure superheated steam drying device for drying hay, including a frame 1, a cylinder 2, and a steam generator 3. The cylinder 2 includes an inner cylinder 21, an outer cylinder 22, and a rotating shaft 23. The outer cylinder 22 and the steam generator 3 are both fixed to the frame 1. The inner cylinder 21 is used to hold hay and is located inside the outer cylinder 22 and the two are coaxially arranged. The rotating shaft 23 is arranged along the axial direction of the outer cylinder 22, passing through the outer cylinder 22 and the inner cylinder 21 in sequence. The rotating shaft 23 is rotatably connected to the outer cylinder 22 and fixedly connected to the inner cylinder 21. The front end of the rotating shaft 23 extends out through the outer cylinder 22. A driven sprocket 4 is installed at the front end of shaft 23. The driven sprocket 4 and shaft 23 are coaxially arranged and fixed at the front end of shaft 23. A motor 5, a drive sprocket 6 and a chain 7 are also provided on the frame 1. The motor 5 includes a motor shaft. The drive sprocket 6 and the motor shaft are coaxially arranged and fixed on the motor shaft. The chain 7 meshes with both the drive sprocket 6 and the driven sprocket 4. The diameter of the drive sprocket 6 is smaller than the diameter of the driven sprocket 4, and the number of teeth of the drive sprocket 6 is smaller than the number of teeth of the driven sprocket 4. The steam generator 3 is connected to the interior of the outer cylinder 22. The steam generator 3 is used to generate superheated steam and deliver superheated steam into the interior of the outer cylinder 22.
[0032] In some embodiments of this application, direct contact drying technology using superheated steam as the drying medium is particularly suitable for drying heat-sensitive materials such as forage due to its significant advantages, including high heat transfer efficiency, excellent product quality, and environmental friendliness. Low-pressure superheated steam drying technology reduces system operating pressure, allowing steam to reach a superheated state at relatively low temperatures. This process not only effectively improves drying efficiency but also significantly enhances the final quality of the dried product. Compared to conventional drying methods, the low-pressure environment combined with appropriate superheating temperature can greatly reduce nutrient loss caused by high-temperature oxidation, ensuring that the dried product retains excellent physicochemical properties and nutritional components.
[0033] In some embodiments of this application, low-pressure superheated steam drying technology provides an innovative solution to the problem of color deterioration during traditional forage drying. This technology enables standardized production of forage drying, reducing energy consumption costs associated with high-temperature drying while saving 25-40% more energy than traditional hot air convection drying methods. Its core technological advantages are: employing a closed-loop dehumidification process design, ensuring that almost all system heat energy is used for moisture evaporation, significantly reducing exhaust heat loss; and utilizing the high-temperature and high-pressure characteristics of superheated steam to achieve forage blanching, not only maintaining good product color but also significantly improving the commercial grade of forage products. This technical solution offers dual benefits in energy saving and quality improvement, providing a new technological path for the forage processing industry.
[0034] In some embodiments of this application, superheated steam drying technology exhibits significant advantages over traditional hot air drying: firstly, it significantly improves thermal efficiency, achieving energy savings of 25-40%; secondly, the heat transfer coefficient is increased by more than 30% compared to conventional methods; thirdly, the system waste heat recovery utilization rate can reach over 80%; and fourthly, the low-oxygen environment effectively inhibits oxidation reactions. In particular, by adjusting the system pressure to achieve low-temperature drying (60-80℃), thermal damage to heat-sensitive materials can be avoided while maintaining the high-speed flow characteristics of steam (flow rate can reach 15-20 m / s), increasing the drying rate by approximately 35%. This technology is particularly suitable for drying temperature-sensitive organic materials.
[0035] In some embodiments of this application, the mass transfer process of superheated steam drying has unique advantages: the moisture migration driven by the internal moisture gradient of the material and the surface steam absorption form a dynamic equilibrium, resulting in near-zero mass transfer resistance (mass transfer coefficient is 40-60% higher than that of hot air drying). Under low-pressure conditions (50-90 kPa), the saturation temperature can be reduced to 60-75°C. This mild drying condition provides triple protection: firstly, it completely preserves heat-sensitive nutrients such as proteins and vitamins (retention rate >95%); secondly, it effectively inhibits enzyme activity (inactivation rate <5%); and finally, it significantly reduces oxidation loss (oxidation degree is reduced by more than 70%). Experimental data show that this technology improves the retention rate of volatile components by more than 50% compared to traditional methods.
[0036] In some embodiments of this application, the low-pressure superheated steam drying system (operating pressure 40-90 kPa) achieves multiple optimizations through precise control of steam parameters: First, the saturation temperature is reduced to 55-70℃, increasing the chlorophyll retention rate of heat-sensitive forage to over 90%; second, the steam superheat is maintained at 20-30℃, ensuring drying efficiency (drying time reduced by 40%) while preventing condensation on the material surface (condensation rate <1%); third, the coordinated control of system vacuum (absolute pressure 60-80 kPa) and steam flow rate (12-18 m / s) reduces unit energy consumption by 30% while improving product color rating by two grades. This multi-parameter coupled control method of pressure-temperature-flow rate provides a reliable technical solution for high-quality forage drying.
[0037] In some embodiments of this application, the steam generator is a conventional specialized device that generates steam by heating water. Its core function is to convert liquid water into steam at a specific pressure and temperature. In this embodiment, the steam generator is an electrically heated steam generator, which can produce superheated steam.
[0038] In some embodiments of this application, the outer circumferential surface of the inner cylinder 21 is provided with a plurality of perforations to allow steam in the outer cylinder 22 to flow into the inner cylinder 21.
[0039] In the above-described scheme of this application, the drum-type low-pressure superheated steam drying device for drying hay includes a frame 1, a cylinder 2, and a steam generator 3. The cylinder 2 includes an inner cylinder 21, an outer cylinder 22, and a rotating shaft 23. The outer cylinder 22 and the steam generator 3 are both fixed to the frame 1. The inner cylinder 21 is used to hold hay and is located inside the outer cylinder 22, with both being coaxially arranged. The rotating shaft 23 is arranged to pass through the outer cylinder 22 and the inner cylinder 21 sequentially along the axial direction of the outer cylinder 22. The rotating shaft 23 is rotatably connected to the outer cylinder 22 and fixedly connected to the inner cylinder 21. The front end of the rotating shaft 23 extends through the outer cylinder 22. A driven sprocket 4 is installed at the front end. The driven sprocket 4 and the rotating shaft 23 are coaxially arranged and fixed at the front end of the rotating shaft 23. The frame 1 is also equipped with a motor 5, a drive sprocket 6 and a chain 7. The motor 5 includes a motor shaft. The drive sprocket 6 and the motor shaft are coaxially arranged and fixed on the motor shaft. The chain 7 meshes with both the drive sprocket 6 and the driven sprocket 4. The diameter of the drive sprocket 6 is smaller than the diameter of the driven sprocket 4, and the number of teeth of the drive sprocket 6 is smaller than the number of teeth of the driven sprocket 4. The steam generator 3 is internally connected to the outer cylinder 22. The steam generator 3 is used to generate superheated steam and deliver superheated steam into the outer cylinder 22. This structure allows for several advantages. First, superheated steam is generated by the steam generator 3 and transported into the outer cylinder 22. The superheated steam inside the outer cylinder 22 enters the inner cylinder 21 and comes into contact with the hay inside, thus drying the hay. Superheated steam drying offers numerous advantages, including a high heat transfer coefficient, good product quality after drying, and environmental protection. Compared to traditional hot air drying devices, this device improves the drying rate of hay, prevents oxidation that could damage its quality, enhances the dried hay's quality, and reduces costs. Second, the motor 5 drives the drive sprocket 6 to rotate. The drive sprocket 6, in turn, drives the driven sprocket 4 via the chain 7. The driven sprocket 4, in turn, drives the shaft 23, which in turn rotates the inner cylinder 21. This rotation of the inner cylinder 21 causes the hay inside to move, resulting in more uniform contact between the hay and the superheated steam, further improving the dried hay's quality.
[0040] In some embodiments of this application, such as Figure 1As shown, the frame 1 includes a base frame 11, a support frame 12, a top frame 13, and a support plate; the base frame 11 includes a first longitudinal beam, a second longitudinal beam, a first crossbeam, a second crossbeam, and a third crossbeam. The first and second longitudinal beams are parallel to each other, and the first, second, and second crossbeams are also parallel to each other. The two ends of the first crossbeam are welded to the front ends of the first and second longitudinal beams, respectively. The two ends of the second crossbeam are welded to the rear ends of the first and second longitudinal beams, respectively. The two ends of the third crossbeam are welded to one end of the first and second longitudinal beams, respectively, and are located at the first crossbeam. Between the first and second crossbeams, the two ends of the outer cylinder 22 are welded to the first and third crossbeams respectively. The top frame 13 includes a front beam, a left beam, a rear beam, and a right beam that are connected in sequence and form a rectangular frame. The support frame 12 includes four support columns, which are respectively located at the two ends of the first and third crossbeams, and the two ends of the support columns are welded to the base frame 11 and the top frame 13 respectively. The length of the base frame 11 is greater than the length of the top frame 13. The support plate is welded to the front ends of both the first and second longitudinal beams, and the steam generator 3 is installed on the support plate. This structure can improve the overall stability of the frame 1, thereby improving the overall stability of the cylinder 2 and the steam generator 3.
[0041] In some embodiments of this application, such as Figure 1 As shown, the frame 1 also includes a first diagonal support 14 and a second diagonal support. One end of the first diagonal support 14 is connected to the first longitudinal beam, and the other end is connected to the outer cylinder 22. One end of the second diagonal support is connected to the second longitudinal beam, and the other end is connected to the outer cylinder 22. Both the first diagonal support 14 and the second diagonal support are inclined relative to the horizontal plane. This structure, using the first diagonal support 14 and the second diagonal support to support the cylinder 2, further improves the stability of the cylinder 2.
[0042] In some embodiments of this application, such as Figure 1 As shown, multiple first diagonal supports 14 are provided, and the multiple first diagonal supports 14 are arranged along the length direction of the first longitudinal beam; multiple second diagonal supports are provided, and the multiple second diagonal supports are arranged along the length direction of the second longitudinal beam. With this structure, the cylinder 2 is supported by multiple first diagonal supports 14 and multiple second diagonal supports, which can further improve the stability of the cylinder 2.
[0043] In some embodiments of this application, such as Figure 1As shown, it also includes a first wheel group 8 and a second wheel group 9. The first wheel group 8 includes a first wheel axle and two first traveling wheels disposed at both ends of the first wheel axle. The first wheel axle is fixedly connected to the base frame 11, and both first traveling wheels are rotatably connected to the first wheel axle. The second wheel group 9 includes a second wheel axle and two second traveling wheels disposed at both ends of the second wheel axle. The second wheel axle is fixedly connected to the base frame 11, and both second traveling wheels are rotatably connected to the second wheel axle. This structure, with the first wheel group 8 and the second wheel group 9, makes transportation of the drying device more convenient and improves its stability during transportation.
[0044] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the upper part of the outer cylinder 22 is provided with a feed inlet 221, which is located at the front end of the outer cylinder 22. With this structure, workers can load hay into the cylinder 2 through the feed inlet 221, making it more convenient for workers to load the hay.
[0045] In some embodiments of this application, the outer circumferential surface of the inner cylinder 21 is provided with a plurality of feeding openings so that workers can load hay into the inner cylinder 21 through the feeding openings.
[0046] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the lower end of the outer cylinder 22 is provided with a discharge port 222, which is located at the rear end of the outer cylinder 22 and has a conical structure. With this structure, workers can take out the hay from the inner cylinder 21 through the discharge port 222, making it more convenient for workers to unload the hay.
[0047] In some embodiments of this application, the outer circumferential surface of the inner cylinder 21 is provided with multiple discharge openings so that workers can take out the hay through the discharge openings.
[0048] In some embodiments of this application, such as Figure 1 As shown, the base frame 11 is also equipped with a pedal assembly 15, which includes a first vertical rod, a second vertical rod, and a pedal. The first and second vertical rods are parallel to each other and are both welded to the first longitudinal beam. The two sides of the pedal are welded to the first and second vertical rods, respectively. With this structure, workers can step on the pedal to load materials, making the loading process more convenient.
[0049] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the cylinder 2 is equipped with a conveying pipe 24, which is welded to the outer cylinder 22. One end of the conveying pipe 24 is connected to the interior of the outer cylinder 22, and the other end is connected to the steam generator 3. This structure facilitates the delivery of superheated steam generated by the steam generator 3 to the cylinder 2.
[0050] In some embodiments of this application, the rotating shaft 23 is provided with spiral stirring blades 231. Using this structure, the forage is stirred by the spiral stirring blades 231, which can improve the drying efficiency and quality of the forage.
[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0054] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A drum-type low-pressure superheated steam drying device for drying forage, characterized in that, The device includes a frame, a cylinder, and a steam generator. The cylinder includes an inner cylinder, an outer cylinder, and a rotating shaft. The outer cylinder and the steam generator are both fixed to the frame. The inner cylinder is used to hold hay and is located inside the outer cylinder, with the two arranged coaxially. The rotating shaft passes through the outer cylinder and the inner cylinder sequentially along the axial direction of the outer cylinder. The rotating shaft is rotatably connected to the outer cylinder and fixedly connected to the inner cylinder. The front end of the rotating shaft extends through the outer cylinder. A driven sprocket is installed at the front end of the rotating shaft. The driven sprocket and the rotating shaft are coaxially arranged and fixed at the front end of the rotating shaft. The frame is also equipped with a motor, a drive sprocket, and a chain. The motor includes a motor shaft. The drive sprocket and the motor shaft are coaxially arranged and fixed on the motor shaft. The chain meshes with both the drive sprocket and the driven sprocket. The diameter of the drive sprocket is smaller than the diameter of the driven sprocket, and the number of teeth on the drive sprocket is smaller than the number of teeth on the driven sprocket. The steam generator is internally connected to the outer cylinder, and the steam generator is used to generate superheated steam and deliver superheated steam into the outer cylinder.
2. The drum-type low-pressure superheated steam drying device for drying forage according to claim 1, characterized in that, The frame includes a base frame, a support frame, a top frame, and a support plate; The base frame includes a first longitudinal beam, a second longitudinal beam, a first crossbeam, a second crossbeam, and a third crossbeam. The first longitudinal beam and the second longitudinal beam are parallel to each other, and the first crossbeam, the second crossbeam, and the second crossbeam are parallel to each other. The two ends of the first crossbeam are welded to the front ends of the first longitudinal beam and the second longitudinal beam, respectively. The two ends of the second crossbeam are welded to the rear ends of the first longitudinal beam and the second longitudinal beam, respectively. The two ends of the third crossbeam are welded to one end of the first longitudinal beam and the second longitudinal beam, respectively, and are located between the first crossbeam and the second crossbeam. The two ends of the outer cylinder are welded to the first crossbeam and the third crossbeam, respectively. The top frame includes a front beam, a left beam, a rear beam, and a right beam that are connected in sequence and form a rectangular frame. The support frame includes four support columns, which are respectively disposed at both ends of the first crossbeam and the third crossbeam, and the two ends of the support columns are respectively welded to the base frame and the top frame. The base frame is longer than the top frame. The support plate is welded to the front ends of the first longitudinal beam and the second longitudinal beam. The steam generator is mounted on the support plate.
3. The drum-type low-pressure superheated steam drying device for drying forage according to claim 2, characterized in that, The frame also includes a first diagonal support and a second diagonal support. One end of the first diagonal support is connected to the first longitudinal beam, and the other end of the first diagonal support is connected to the outer cylinder. One end of the second inclined support is connected to the second longitudinal beam, and the other end of the second inclined support is connected to the outer cylinder. Both the first inclined support and the second inclined support are inclined relative to the horizontal plane.
4. The drum-type low-pressure superheated steam drying device for drying forage according to claim 3, characterized in that, The first diagonal support is provided in multiple ways, and the multiple first diagonal supports are arranged along the length direction of the first longitudinal beam; The second diagonal support is provided in multiple ways, and the multiple second diagonal supports are arranged along the length direction of the second longitudinal beam.
5. The drum-type low-pressure superheated steam drying device for drying forage according to claim 2, characterized in that, It also includes the first round group and the second round group; The first wheel set includes a first wheel axle and two first traveling wheels disposed at both ends of the first wheel axle. The first wheel axle is fixedly connected to the base frame, and both first traveling wheels are rotatably connected to the first wheel axle. The second wheel set includes a second wheel axle and two second travel wheels disposed at both ends of the second wheel axle. The second wheel axle is fixedly connected to the base frame, and both second travel wheels are rotatably connected to the second wheel axle.
6. The drum-type low-pressure superheated steam drying device for drying forage according to claim 2, characterized in that, The upper part of the outer cylinder is provided with a feed inlet, which is located at the front end of the outer cylinder.
7. The drum-type low-pressure superheated steam drying device for drying forage according to claim 6, characterized in that, The lower end of the outer cylinder is provided with a discharge port, which is located at the rear end of the outer cylinder and has a conical structure.
8. The drum-type low-pressure superheated steam drying device for drying forage according to claim 6, characterized in that, The base frame is also provided with a pedal assembly, which includes a first vertical rod, a second vertical rod, and a pedal. The first vertical rod and the second vertical rod are parallel to each other and are both welded to the first longitudinal beam. The two sides of the pedal are respectively welded to the first vertical rod and the second vertical rod.
9. The drum-type low-pressure superheated steam drying device for drying forage according to claim 1, characterized in that, The cylinder is provided with a conveying pipe, which is welded to the outer cylinder. One end of the conveying pipe is connected to the inside of the outer cylinder, and the other end is connected to the steam generator.
10. The drum-type low-pressure superheated steam drying device for drying forage according to claim 1, characterized in that, The rotating shaft is equipped with spiral stirring blades.