Polygonatum sibiricum drying equipment with ultrasonic-assisted low-temperature hot air circulation

Abstract

The invention relates to the technical field of traditional Chinese medicinal material processing equipment, in particular to ultrasonic-assisted low-temperature hot air circulation polygonatum sibiricum drying equipment which comprises a cabin body, and a material bearing, taking and placing mechanism which is used for bearing polygonatum sibiricum materials and can automatically move in and out is arranged in the cabin body. The top of the inner wall of the cabin body is provided with an ultrasonic generating mechanism used for applying ultrasonic energy, the bottom of the inner wall of the cabin body is provided with a hot air circulating mechanism used for generating and evenly providing dry hot air with the temperature ranging from 20 DEG C to 50 DEG C, and the two sides of the cabin body are symmetrically provided with adjustable ventilation and dehumidification mechanisms used for ventilation and dehumidification. A cabin door is correspondingly arranged on the front side of the cabin body, and a controller is correspondingly arranged on the outer side of the cabin body. And the ultrasonic generating mechanism works cooperatively with the hot air circulating mechanism and the adjustable ventilating and dehumidifying mechanism. The special drying equipment for the rhizoma polygonati combines an ultrasonic technology and low-temperature hot air drying and moisture removal, is high in drying efficiency and low in energy consumption, and can retain active ingredients of the rhizoma polygonati to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for processing Chinese medicinal materials, specifically to a drying device for Polygonatum sibiricum using ultrasonic-assisted low-temperature hot air circulation. Background Technology

[0002] Precious and delicate Chinese medicinal herbs such as Polygonatum sibiricum are rich in heat-sensitive active ingredients such as polysaccharides and saponins. Traditional hot air drying, with its high temperature and long duration, easily leads to the loss of these components and deterioration of quality. Although low-temperature hot air drying equipment has been developed to alleviate this problem to some extent, low drying efficiency, high energy consumption, and significant resistance to moisture migration from the inside out remain technical bottlenecks. Ultrasonic technology, due to its cavitation and mechanical effects, can effectively enhance the mass transfer process; however, how to efficiently and stably integrate it with a low-temperature hot air system into a single device, and how to optimize the design specifically for the material characteristics of Polygonatum sibiricum, are urgent problems to be solved in this field. Summary of the Invention

[0003] To overcome the technical deficiencies in the prior art and effectively solve the technical problems in the background art, the present invention provides the following technical solution:

[0004] An ultrasonic-assisted low-temperature hot air circulation drying device for Polygonatum sibiricum includes a chamber. The chamber is equipped with a material handling and loading mechanism that can automatically move in and out for holding Polygonatum sibiricum material. The top of the inner wall of the chamber is equipped with an ultrasonic generating mechanism for applying ultrasonic energy. The bottom of the inner wall of the chamber is equipped with a hot air circulation mechanism for generating and uniformly providing drying hot air at a temperature of 20-50℃. The two sides of the chamber are symmetrically equipped with adjustable ventilation and dehumidification mechanisms for ventilation and dehumidification. A door is correspondingly provided on the front side of the chamber, and a controller is correspondingly provided on the outer side of the chamber.

[0005] The ultrasonic generating mechanism works in conjunction with the hot air circulation mechanism and the adjustable ventilation and dehumidification mechanism. The ultrasonic generating mechanism is used to promote the migration of moisture inside the Polygonatum to the surface, and the hot air circulation mechanism and the adjustable ventilation and dehumidification mechanism are used to vaporize and remove the moisture that has migrated to the surface of the material.

[0006] As a preferred embodiment of the present invention, the hot air circulation mechanism includes a housing, an air filter, a fan, an electric heater, a hot air duct, a diversion duct, a temperature sensor, and a humidity sensor. The bottom of the housing is provided with a housing that is open at both the top and bottom. The inner wall of the housing is provided with an air filter, a fan, and an electric heater in sequence from bottom to top. A hot air duct communicating with the inner cavity of the housing is provided at the center of the bottom of the inner wall of the housing. Diversion ducts are evenly distributed and connected to the outer side of the hot air duct. Temperature sensors and humidity sensors are evenly distributed on both sides of the inner wall of the housing.

[0007] As a preferred embodiment of the present invention, the ultrasonic generating mechanism includes an ultrasonic generator, a groove, an ultrasonic transducer, a coolant circulation pipe, an inlet pipe, and an outlet pipe. The ultrasonic generator is disposed on the upper surface of the cabin. A groove is arrayed in the top of the cabin. An ultrasonic transducer is disposed in the groove. A coolant circulation pipe is disposed on the outside of the ultrasonic transducer. An inlet pipe and an outlet pipe, which can be connected to an external circulating cooling water source, are respectively disposed at both ends of the coolant circulation pipe.

[0008] As a preferred embodiment of the present invention, the material handling and loading mechanism includes an installation groove, an auxiliary slide, a reciprocating assembly, an auxiliary assembly, a synchronous drive assembly, a carrying tray, and a chute. The left and right sides of the inner wall of the chamber are linearly arranged from top to bottom with symmetrical installation grooves. A reciprocating assembly is installed in the installation groove on the left side, and an auxiliary assembly is installed in the installation groove on the right side. A carrying tray with a mesh bottom is positioned between a group of reciprocating assemblies and auxiliary assemblies symmetrically arranged on the same horizontal plane. The number of carrying trays is at least three. A chute is provided on the rear side of each carrying tray to slide and connect with the outer side of a hot air duct. An auxiliary slide is provided on the lower edge of the installation groove to slide and connect with the bottom of the carrying tray. The temperature sensor and humidity sensor are both located below the auxiliary slide. The diversion pipes are evenly distributed and staggered above and below each carrying tray.

[0009] The reciprocating assembly includes a lead screw, a slider, and a guide rod. The guide rod is fixedly installed between the front and rear walls of the mounting slot on the left side. The lead screw is rotatably connected between the front and rear walls of the mounting slot on the left side via a bearing. The lead screw and the guide rod are parallel to each other. The guide rod is slidably connected to a sliding hole on the side of the slider. The lead screw is threadedly connected to a threaded hole on the side of the slider. The slider is fixedly connected to the rear end of the left side of the support tray.

[0010] The auxiliary component includes a slide rod and a movable block. The slide rod is fixedly installed between the front and rear walls of the mounting slot located on the right side. The slide rod is slidably connected to a sliding hole on the side of the movable block. The movable block is fixedly connected to the rear end of the right side of the carrying tray.

[0011] The synchronous drive assembly includes a synchronous pulley, a synchronous belt, a worm gear, a fixed plate, a worm, and a motor. The lead screw extends to the rear side of the cabin and is equipped with a synchronous pulley. A synchronous belt is located on the outer side of the synchronous pulley. The rear side of the upper synchronous pulley is rotatably connected to a worm gear via a bearing and a shaft. The fixed plate is located on the rear side of the cabin. The worm is rotatably connected to one side of the fixed plate and meshes with the worm gear. The motor is fixedly installed on one side of the fixed plate, and the output shaft of the motor is fixedly connected to one end of the worm.

[0012] As a preferred embodiment of the present invention, the adjustable ventilation and dehumidification mechanism includes a vent, a filter screen, a fixed frame, a rotating plate, an adjusting shaft, and a synchronous drive assembly. The left and right sides of the chamber are respectively provided with vents corresponding to the carrying tray from top to bottom. A filter screen is provided inside the vent. A fixed frame is provided outside the vent. An adjusting shaft is rotatably connected between the front and rear inner walls of the fixed frame. A rotating plate is provided on the adjusting shaft for adjusting the opening and closing angle of the vent and the size of the opening and closing angle.

[0013] The second synchronous drive assembly includes a second synchronous pulley, a second synchronous belt, a driven bevel gear, a driving bevel gear, a drive shaft, a support plate, and a dual-axis motor. The second synchronous pulley is located at one end of the adjusting shaft extending to the rear side of the fixed frame. The second synchronous belt is located on the outer side of the second synchronous pulley on the same side. Driven bevel gears are symmetrically arranged on the rear side of the two second synchronous pulleys located at the top. Support plates are respectively arranged on the inner side of the two driven bevel gears. Drive shafts are rotatably connected to the outer side of the two support plates. Driving bevel gears are respectively arranged on the outer side of the two drive shafts. The two driving bevel gears mesh with the two driven bevel gears respectively. The dual-axis motor is located on the rear side of the cabin between the two support plates. The left and right output ends of the dual-axis motor are respectively fixedly connected to the inner ends of the two drive shafts.

[0014] As a preferred embodiment of the present invention, the hatch is provided with an observation window and a handle.

[0015] As a preferred technical solution of the present invention, it also includes a moving mechanism. The hatch includes outriggers and casters. Outriggers are respectively provided at the four corners of the bottom of the hatch. The bottom of the outriggers is provided with casters with foot brakes via mounting seats.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a special drying equipment for Polygonatum sibiricum that combines ultrasonic technology with low-temperature hot air drying and dehumidification, which has high drying efficiency, low energy consumption, and can retain the active ingredients of Polygonatum sibiricum to the maximum extent. Specifically:

[0017] 1. Synergistic Effect: The cavitation and mechanical effects of ultrasound can disrupt the cell wall structure and form microchannels without raising the material temperature, greatly enhancing the migration (internal diffusion) of moisture from the interior of Polygonatum to the surface; low-temperature hot air is responsible for efficiently vaporizing and carrying away the surface moisture (external diffusion). The synergy of these two effects breaks through the bottleneck of single drying methods and significantly shortens the drying time.

[0018] 2. Superior quality: Strict low-temperature conditions (≤50℃) fundamentally prevent the denaturation and inactivation of heat-sensitive substances (such as Polygonatum polysaccharide); the rapid drying process also reduces the exposure time of materials in adverse environments, and the final product's color, shape, and retention rate of effective ingredients are significantly better than those of traditional methods.

[0019] 3. Energy-saving and efficient: The drying time is shortened, the energy consumption per unit product is reduced, and the hot air utilization rate is high.

[0020] 4. Intelligent control: The drying process can be flexibly customized according to the initial moisture content and quality requirements of different batches of Polygonatum, so as to ensure the stability and consistency of product quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a rear view of the present invention.

[0023] Figure 3 This is a partial structural schematic diagram of the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the cabin of the present invention.

[0025] Figure 5 This is a bottom view of the internal structure of the cabin of the present invention.

[0026] Figure 6 This is a partial structural schematic diagram of the ultrasonic wave generating mechanism of the present invention.

[0027] Figure 7 This is a schematic diagram of the hot air circulation mechanism of the present invention.

[0028] Figure 8 This is a schematic diagram of the material carrying and placing mechanism of the present invention.

[0029] Figure 9 This is a partial structural schematic diagram of the material carrying and handling mechanism of the present invention.

[0030] Figure 10 This is a schematic diagram of the structure of the synchronous drive component of the present invention.

[0031] Figure 11 This is a schematic diagram of the adjustable ventilation and dehumidification mechanism of the present invention.

[0032] Figure 12 This is a partial left view of the adjustable ventilation and dehumidification mechanism of the present invention.

[0033] Figure 13 This is a schematic diagram of the structure of the second synchronous drive component of the present invention.

[0034] Figure 14 This is a circuit control block diagram of the present invention.

[0035] In the picture:

[0036] Cabin 1;

[0037] 2. Hot air circulation mechanism, 21. Housing, 22. Air filter, 23. Fan, 24. Electric heater, 25. Hot air duct, 26. Diversion duct, 27. Temperature sensor, 28. Humidity sensor;

[0038] 3. Ultrasonic generating mechanism; 31. Ultrasonic generator; 32. Groove; 33. Ultrasonic transducer; 34. Coolant circulation pipe; 35. Inlet pipe; 36. Outlet pipe.

[0039] Material handling and loading mechanism 4, mounting groove 41, auxiliary slide table 42, reciprocating assembly 43, lead screw 431, slider 432, guide rod 433, auxiliary assembly 44, slide bar 441, movable block 442, synchronous drive assembly 45, synchronous pulley 451, synchronous belt 452, worm gear 453, fixed plate 454, worm 455, motor 456, carrying tray 46, slide groove 47;

[0040] Adjustable ventilation and dehumidification mechanism 5, ventilation opening 51, filter screen 52, fixed frame 53, rotating plate 54, adjusting shaft 55, synchronous drive assembly II 56, synchronous pulley II 561, synchronous belt II 562, driven bevel gear 563, driving bevel gear 564, drive shaft 565, support plate 566, dual-shaft motor 567;

[0041] Controller 6;

[0042] 7. Hatch door; 71. Observation window; 72. Handle.

[0043] 8. Mobility mechanism; 81. Outriggers; 82. Casters. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figure 1-14This invention provides a technical solution: an ultrasonic-assisted low-temperature hot air circulation drying device for Polygonatum sibiricum, comprising a sealed and insulated chamber 1. Specifically, the inner wall of the chamber 1 is made of stainless steel and covered with insulation material to reduce heat loss. The chamber 1 is equipped with a material carrying and loading mechanism 4 that can automatically move in and out for holding Polygonatum sibiricum material. The top of the inner wall of the chamber 1 is equipped with an ultrasonic generating mechanism 3 for applying ultrasonic energy. The bottom of the inner wall of the chamber 1 is equipped with a hot air circulation mechanism 2 for generating and uniformly providing drying hot air at a temperature of 20-50℃. The two sides of the chamber 1 are symmetrically equipped with adjustable ventilation and dehumidification mechanisms 5 for ventilation and dehumidification. The front side of the chamber 1 is equipped with a door 7, which is equipped with a sealing strip. The outer side of the chamber 1 is equipped with a controller 6.

[0046] The ultrasonic generating mechanism 3 works in conjunction with the hot air circulation mechanism 2 and the adjustable ventilation and dehumidification mechanism 5. The ultrasonic generating mechanism 3 is used to promote the migration of moisture inside the Polygonatum to the surface, while the hot air circulation mechanism 2 and the adjustable ventilation and dehumidification mechanism 5 are used to vaporize and remove the moisture that has migrated to the surface of the material.

[0047] Furthermore, such as Figure 7 As shown, the hot air circulation mechanism 2 includes a housing 21, an air filter 22, a fan 23, an electric heater 24 (which may be a low-power PTC ceramic heater), a hot air duct 25, a diversion duct 26, a temperature sensor 27, and a humidity sensor 28. The bottom of the housing 1 is provided with a housing 21 that is open at both the top and bottom. The inner wall of the housing 21 is provided with an air filter 22, a fan 23, and an electric heater 24 from bottom to top. The center of the bottom of the inner wall of the housing 1 is provided with a hot air duct 25 that connects to the inner cavity of the housing 21. The diversion duct 26 is evenly distributed and connected to the outer side of the hot air duct 25. The temperature sensor 27 and the humidity sensor 28 are evenly distributed on both sides of the inner wall of the housing 1.

[0048] Furthermore, such as Figure 3 , 5 As shown in Figure 6, the ultrasonic generating mechanism 3 includes an ultrasonic generator 31, a groove 32, an ultrasonic transducer 33, a coolant circulation pipe 34, an inlet pipe 35, and an outlet pipe 36. The ultrasonic generator 31 is located on the upper surface of the chamber 1 and is used to generate high-frequency electrical signals. The top array inside the chamber 1 has a groove 32, and the ultrasonic transducer 33 is installed in the groove 32. Its radiation surface is flush with the chamber wall to avoid obstructing the placement of materials and airflow circulation. The transducer converts the electrical signal into high-frequency mechanical vibration (ultrasound), which directly acts on the air medium inside the chamber and then on the Polygonatum material. The coolant circulation pipe 34 is installed on the outside of the ultrasonic transducer 33. The two ends of the coolant circulation pipe 34 are respectively provided with an inlet pipe 35 and an outlet pipe 36 that can be connected to an external circulating cooling water source to cool the transducer and ensure its long-term stable operation.

[0049] Furthermore, such as Figure 8-10 As shown, the material handling and loading mechanism 4 includes an installation slot 41, an auxiliary slide 42, a reciprocating assembly 43, an auxiliary assembly 44, a synchronous drive assembly 45, a carrying tray 46, and a chute 47. The left and right sides of the inner wall of the chamber 1 are linearly arranged from top to bottom with symmetrical installation slots 41. The reciprocating assembly 43 is installed in the installation slot 41 on the left side, and the auxiliary assembly 44 is installed in the installation slot 41 on the right side. A carrying tray 46 with a mesh plate at the bottom (to ensure that hot air and ultrasonic energy can be effectively penetrated) is set between a set of reciprocating assemblies 43 and auxiliary assemblies 44 on the same horizontal plane. There are at least three carrying trays 46. A chute 47 is opened on the rear side of the carrying tray 46 and is slidably connected to the outside of the hot air duct 25. An auxiliary slide 42 is set on the lower edge of the installation slot 41 and is slidably connected to the bottom of the carrying tray 46. Temperature sensor 27 and humidity sensor 28 are both located below the auxiliary slide 42. Diversion pipes 26 are evenly distributed and staggered above and below each carrying tray 46.

[0050] like Figure 9 As shown, the reciprocating assembly 43 includes a lead screw 431, a slider 432, and a guide rod 433. The guide rod 433 is fixedly installed between the front and rear walls of the mounting groove 41 located on the left side. The lead screw 431 is rotatably connected between the front and rear walls of the mounting groove 41 located on the left side through a bearing. The lead screw 431 and the guide rod 433 are parallel to each other. The guide rod 433 is slidably connected to the sliding hole on the side of the slider 432. The lead screw 431 is threadedly connected to the threaded hole on the side of the slider 432. The slider 432 is fixedly connected to the rear end of the left side of the support tray 46.

[0051] like Figure 9 As shown, the auxiliary component 44 includes a slide rod 441 and a movable block 442. The slide rod 441 is fixedly installed between the front and rear walls of the mounting groove 41 located on the right side. The slide rod 441 is slidably connected to the sliding hole on the side of the movable block 442. The movable block 442 is fixedly connected to the rear end of the right side of the carrying tray 46.

[0052] like Figure 10As shown, the synchronous drive assembly 45 includes a synchronous pulley 451, a synchronous belt 452, a worm gear 453, a fixed plate 454, a worm 455, and a motor 456. The synchronous pulley 451 is provided at one end of the lead screw 431 extending to the rear side of the cabin 1. The synchronous belt 452 is provided on the outer side of the synchronous pulley 451. The worm gear 453 is rotatably connected to the rear side of the upper synchronous pulley 451 through a bearing and a rotating shaft. The fixed plate 454 is provided at the rear side of the cabin 1. The worm 455 is rotatably connected to one side of the fixed plate 454. The worm 455 and the worm gear 453 mesh correspondingly. The motor 456 is fixedly installed on one side of the fixed plate 454. The output shaft of the motor 456 is fixedly connected to one end of the worm 455. The synchronous drive assembly 45 drives the reciprocating assembly 43, which drives the automatic entry and exit movement of the carrying pallet 46, facilitating the loading and unloading of materials (its control operation principle is an existing mature technology, and its principle will not be further described here).

[0053] Furthermore, such as Figure 11-13 As shown, the adjustable ventilation and dehumidification mechanism 5 includes a vent 51, a filter screen 52, a fixed frame 53, a rotating plate 54, an adjusting shaft 55, and a synchronous drive assembly 56. Ventilation vents 51 corresponding to the carrying tray 46 are arranged from top to bottom on the left and right sides of the chamber 1. A filter screen 52 is installed inside the ventilation vent 51. A fixed frame 53 is installed on the outside of the ventilation vent 51. An adjusting shaft 55 is rotatably connected between the front and rear inner walls of the fixed frame 53. A rotating plate 54 is installed on the adjusting shaft 55 for adjusting the opening and closing angle of the ventilation vent 51.

[0054] like Figure 13As shown, the second synchronous drive assembly 56 includes a second synchronous pulley 561, a second synchronous belt 562, a driven bevel gear 563, a driving bevel gear 564, a drive shaft 565, a support plate 566, and a dual-axis motor 567. The second synchronous pulley 561 is located at one end of the adjusting shaft 55 extending to the rear side of the fixed frame 53. The second synchronous belt 562 is located on the outer side of the second synchronous pulley 561 on the same side. Driven bevel gears 563 are symmetrically arranged on the rear sides of the two upper left and right synchronous pulleys 561. Support plates 566 are respectively located on the inner sides of the two driven bevel gears 563. Drive shafts 564 are rotatably connected to the outer sides of the two support plates 566. 5. Two drive shafts 565 are respectively provided with active bevel gears 564 on their outer sides. The two active bevel gears 564 mesh with the two driven bevel gears 563 respectively. The dual-shaft motor 567 is located on the rear side of the cabin 1 between the two support plates 566. The left and right output ends of the dual-shaft motor 567 are fixedly connected to the inner ends of the two drive shafts 565 respectively. The rotating plate 54 and the adjusting shaft 55 are driven to rotate and adjust through the synchronous drive assembly 2 56 (the control operation principle is a mature existing technology, and its principle will not be further described here). It can automatically or manually open a certain degree according to the humidity of the air in the cabin to discharge high humidity air and maintain dry power.

[0055] Furthermore, such as Figure 1 As shown, the hatch 7 is equipped with an observation window 71 and a handle 72.

[0056] Furthermore, such as Figure 2 As shown, it also includes a moving mechanism 8. The hatch 7 includes outriggers 81 and casters 82. Outriggers 81 are respectively provided at the four corners of the bottom of the hatch 1. The bottom of the outriggers 81 is provided with casters 82 with foot brakes through the mounting base for easy movement.

[0057] Specifically, the controller 6 adopts a PLC or microprocessor. The controller 6 receives signals from the temperature sensor 27 and humidity sensor 28, etc., and controls the power of the electric heater 24, the speed of the fan 23, the opening degree of the adjustable ventilation and dehumidification mechanism, the power and start / stop of the ultrasonic generator 31, the rotation of the motor 456 and the dual-axis motor 567, etc., according to the set parameters. The controller 6 can also execute an intermittent ultrasonic working mode.

[0058] In this application, the fan 23, electric heater 24, temperature sensor 27, humidity sensor 28, ultrasonic generator 31, ultrasonic transducer 33, motor 456, dual-axis motor 567, controller 6, and external power supply are electrically connected to each other. All of the above devices use conventional devices commonly used in the prior art, and their connection and operation control principles are all existing mature technologies. Their principles will not be further described here.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drying device for Polygonatum odoratum using ultrasonic-assisted low-temperature hot air circulation, comprising a chamber (1), characterized in that: The chamber (1) is equipped with a material carrying and loading mechanism (4) for holding and automatically moving in and out of the material. The top of the inner wall of the chamber (1) is equipped with an ultrasonic generating mechanism (3) for applying ultrasonic energy. The bottom of the inner wall of the chamber (1) is equipped with a hot air circulation mechanism (2) for generating and uniformly providing dry hot air at a temperature of 20-50℃. The two sides of the chamber (1) are symmetrically equipped with adjustable ventilation and dehumidification mechanisms (5) for ventilation and dehumidification. The front side of the chamber (1) is equipped with a door (7). The outer side of the chamber (1) is equipped with a controller (6). The ultrasonic generating mechanism (3) works in conjunction with the hot air circulation mechanism (2) and the adjustable ventilation and dehumidification mechanism (5). The ultrasonic generating mechanism (3) is used to promote the migration of moisture inside the Polygonatum to the surface. The hot air circulation mechanism (2) and the adjustable ventilation and dehumidification mechanism (5) are used to vaporize and remove the moisture that has migrated to the surface of the material.

2. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 1, characterized in that: The hot air circulation mechanism (2) includes a housing (21), an air filter (22), a fan (23), an electric heater (24), a hot air duct (25), a diversion duct (26), a temperature sensor (27), and a humidity sensor (28). The bottom of the housing (1) is provided with a housing (21) that is open at both the top and bottom. The inner wall of the housing (21) is provided with an air filter (22), a fan (23), and an electric heater (24) from bottom to top. The center of the bottom of the inner wall of the housing (1) is provided with a hot air duct (25) that connects to the inner cavity of the housing (21). The outer side of the hot air duct (25) is provided with diversion ducts (26) evenly distributed. The temperature sensor (27) and the humidity sensor (28) are evenly distributed on both sides of the inner wall of the housing (1).

3. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 2, characterized in that: The ultrasonic generating mechanism (3) includes an ultrasonic generator (31), a groove (32), an ultrasonic transducer (33), a coolant circulation pipe (34), an inlet pipe (35), and an outlet pipe (36). The ultrasonic generator (31) is located on the upper surface of the cabin (1). The top array inside the cabin (1) has a groove (32). The ultrasonic transducer (33) is located in the groove (32). The coolant circulation pipe (34) is located on the outside of the ultrasonic transducer (33). The two ends of the coolant circulation pipe (34) are respectively provided with an inlet pipe (35) and an outlet pipe (36) that can be connected to an external circulating cooling water source.

4. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 3, characterized in that: The material handling and loading mechanism (4) includes a mounting slot (41), an auxiliary slide (42), a reciprocating assembly (43), an auxiliary assembly (44), a synchronous drive assembly (45), a carrying tray (46), and a chute (47). The inner walls of the cabin (1) are provided with symmetrical mounting slots arranged linearly from top to bottom on the left and right sides. The reciprocating assembly (43) is installed in the mounting slot (41) on the left side, and the auxiliary assembly (44) is installed in the mounting slot (41) on the right side. A set of reciprocating assemblies (43) and auxiliary assemblies are symmetrically arranged on the same horizontal plane. (44) There are three support trays (46) with mesh bottoms between them. The support trays (46) are at least three in number. The rear side of the support trays (46) is provided with a sliding groove (47) that is slidably connected to the outer side of the hot air duct (25). The lower edge of the mounting groove (41) is provided with an auxiliary slide (42) that is slidably connected to the bottom of the support trays (46). The temperature sensor (27) and humidity sensor (28) are both located below the auxiliary slide (42). The diversion pipes (26) are evenly distributed and staggered above and below each support tray (46). The reciprocating assembly (43) includes a lead screw (431), a slider (432), and a guide rod (433). The guide rod (433) is fixedly installed between the front and rear walls of the mounting groove (41) on the left side. The lead screw (431) is rotatably connected between the front and rear walls of the mounting groove (41) on the left side via a bearing. The lead screw (431) and the guide rod (433) are parallel to each other. The guide rod (433) is slidably connected to the sliding hole on the side of the slider (432). The lead screw (431) is threadedly connected to the threaded hole on the side of the slider (432). The slider (432) is fixedly connected to the rear end of the left side of the support tray (46). The auxiliary component (44) includes a slide rod (441) and a movable block (442). The slide rod (441) is fixedly installed between the front and rear walls of the mounting groove (41) located on the right side. The slide rod (441) is slidably connected to the sliding hole on the side of the movable block (442). The movable block (442) is fixedly connected to the rear end of the right side of the carrying tray (46). The synchronous drive assembly (45) includes a synchronous pulley (451), a synchronous belt (452), a worm gear (453), a fixed plate (454), a worm (455), and a motor (456). The lead screw (431) extends to one end of the rear side of the cabin (1) and is provided with a synchronous pulley (451). The synchronous belt (452) is provided on the outer side of the synchronous pulley (451). The rear side of the upper synchronous pulley (451) is rotatably connected to the worm gear (453) through a bearing and a rotating shaft. The fixed plate (454) is provided on the rear side of the cabin (1). The worm gear (455) is rotatably connected to one side of the fixed plate (454). The worm gear (455) meshes with the worm gear (453). The motor (456) is fixedly installed on one side of the fixed plate (454). The output shaft of the motor (456) is fixedly connected to one end of the worm gear (455).

5. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 4, characterized in that: The adjustable ventilation and dehumidification mechanism (5) includes a vent (51), a filter screen (52), a fixed frame (53), a rotating plate (54), an adjusting shaft (55), and a synchronous drive assembly (56). The left and right sides of the chamber (1) are respectively provided with vents (51) corresponding to the carrying tray (46) from top to bottom. The vents (51) are provided with a filter screen (52). The outside of the vents (51) is provided with a fixed frame (53). The adjusting shaft (55) is rotatably connected between the front and rear inner walls of the fixed frame (53). The adjusting shaft (55) is provided with a rotating plate (54) for adjusting the opening and closing angle of the vents (51) and the size of the opening and closing angle. The second synchronous drive assembly (56) includes a second synchronous pulley (561), a second synchronous belt (562), a driven bevel gear (563), a driving bevel gear (564), a drive shaft (565), a support plate (566), and a dual-axis motor (567). The second synchronous pulley (561) is located at one end of the adjusting shaft (55) extending to the rear side of the fixed frame (53). A second synchronous belt (562) is located on the outer side of the second synchronous pulley (561) on the same side. Driven bevel gears (563) are symmetrically arranged on the rear sides of the two upper left and right synchronous pulleys (561). The inner side of each driven bevel gear (563) is provided with a support plate (566), and the outer sides of the two support plates (566) are respectively rotatably connected with drive shafts (565). The outer sides of the two drive shafts (565) are respectively provided with driving bevel gears (564). The two driving bevel gears (564) mesh with the two driven bevel gears (563) respectively. The dual-axis motor (567) is located on the rear side of the cabin (1) between the two support plates (566). The left and right output ends of the dual-axis motor (567) are respectively fixedly connected to the inner ends of the two drive shafts (565).

6. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 1, characterized in that: The hatch (7) is provided with an observation window (71) and a handle (72).

7. The ultrasonic-assisted low-temperature hot air circulation drying equipment for Polygonatum sibiricum according to claim 1, characterized in that: It also includes a moving mechanism (8), the hatch (7) includes outriggers (81) and casters (82), outriggers (81) are respectively provided at the four corners of the bottom of the cabin (1), and casters (82) with foot brakes are provided at the bottom of the outriggers (81) via mounting seats.

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