Infrared hot air combined dryer for ginseng

Abstract

The utility model discloses an infrared hot -blast combined dryer of ginseng, belongs to the field of traditional chinese medicinal material processing equipment technology. Aiming at the problem that the traditional natural airing period is long, single hot -blast drying is uneven and active ingredient is easy to damage, the utility model discloses a transmission subassembly, drying box, vibration feed assembly and infrared -hot -blast combined drying subassembly, through the synergies of infrared radiation and hot -blast convection, combines intelligent temperature control and circulating hot -blast design, realizes ginseng efficient, even drying, effectively retains active ingredient, and energy consumption reduces 20% 30%, and is applicable to the scale processing of ginseng and other traditional chinese medicinal materials.

Description

Technical Field

[0001] This utility model relates to the field of equipment for processing Chinese medicinal materials, and in particular to a combined infrared hot air drying machine for Gastrodia elata. Background Technology

[0002] Gastrodia elata is a traditional and precious Chinese medicinal herb. Its main active ingredients (such as gastrodin, gastrodia polysaccharide, and vanillin) are extremely sensitive to temperature, humidity, and processing techniques: high temperatures can easily lead to the decomposition of active ingredients, reducing efficacy; improper humidity control can easily cause mold growth or excessive drying and cracking, affecting the quality of the herb. Therefore, the drying and processing of Gastrodia elata is a core step that determines its medicinal and economic value.

[0003] Currently, the processing of Gastrodia elata mainly relies on traditional natural sun-drying or single hot air drying technology, but both have significant drawbacks: 1. Natural sun-drying: It is greatly restricted by weather conditions, and rainy days easily lead to mold and rot; the sun-drying cycle is as long as 7-15 days, which is inefficient; moreover, the open-air environment is seriously polluted by dust and microorganisms, making it difficult to meet the hygiene standards and large-scale production requirements of modern Chinese medicine processing. 2. Single hot air drying: Although it can shorten the cycle to 3-5 days, the hot air only transfers heat through surface convection, and the internal moisture of Gastrodia elata diffuses slowly, often resulting in an uneven phenomenon of "dry outside and wet inside", requiring repeated turning or extending the drying time, leading to increased energy consumption; some equipment uses a high-temperature mode to accelerate drying, but this will destroy the heat-sensitive components in Gastrodia elata (such as gastrodin), resulting in a loss of 20%-30% of the medicinal efficacy. 3. Existing combined drying equipment: Although there are some drying devices that combine hot air and infrared, the following problems still exist: First, the structure is complex, the coordination between hot air circulation and infrared radiation is poor, and it is difficult to dynamically adjust the process parameters according to the moisture content of Gastrodia elata; second, the feeding is uneven, which easily leads to material accumulation or blockage, affecting the uniformity of drying; third, there is a lack of heat preservation and sealing design, resulting in serious heat loss and further increasing energy consumption.

[0004] In summary, given the biological characteristics of Gastrodia elata and the shortcomings of traditional processing techniques, there is an urgent need for a combined drying equipment that combines high efficiency, uniformity, and intelligent control capabilities to achieve high-quality, low-consumption processing of Gastrodia elata and promote the technological upgrading of the traditional Chinese medicine processing industry. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a gastrodia elata infrared hot air combined dryer.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a combined infrared and hot air drying machine for Gastrodia elata, comprising a frame, a transmission component, a drying chamber, a vibrating feeding component, a hot air drying component, an infrared drying component, and a discharge hopper. The frame is a horizontally arranged metal frame structure. The transmission component is horizontally arranged inside the frame and is used to carry and transport Gastrodia elata material. The drying chamber is a rectangular sealed box with an open top, fixed to the top of the frame, and its interior is arranged corresponding to the conveying path of the transmission component. The vibrating feeding component is installed on one side of the top opening of the drying chamber and is used to uniformly transport the Gastrodia elata to be dried to the transmission component. The hot air drying component is symmetrically arranged on both side walls of the drying chamber and is used to introduce hot air into the drying chamber. The infrared drying component is distributed at intervals on the upper and lower sides of the transmission component along the conveying direction of the transmission component and is used to perform infrared radiation drying on the Gastrodia elata. The discharge hopper is fixed at the bottom of the drying chamber away from the vibrating feeding component and is connected to the end of the transmission component to discharge the dried Gastrodia elata.

[0007] As a preferred embodiment of this utility model, the transmission assembly includes: a drive shaft assembly, which consists of multiple square steel pipes evenly spaced along the length of the frame at the bottom of the inner side of the frame, with both ends of each drive shaft assembly rotatably connected to the side wall of the frame via bearings with mounting seats; an annular transmission belt, made of rubber, fitted around the outer circumference of two adjacent drive shaft assemblies; a material box, whose bottom is fixedly connected to the upper surface of the annular transmission belt, with through holes of 3-8mm in diameter evenly distributed on the surface of the material box; a transmission drive motor, fixed to the outside of the frame, with its output shaft connected to the end of one of the drive shaft assemblies via a coupling; and the bottommost material box connected to the top opening of the discharge hopper.

[0008] As a preferred embodiment of this utility model, the inner wall of the drying oven is covered with a heat insulation layer, which is made of rock wool board with a thickness of 50-100mm; the top opening of the drying oven is provided with an openable and closable sealing cover, which is hinged to the top of the drying oven via a hinge.

[0009] As a preferred embodiment of this utility model, the vibrating feeding assembly includes: a fixed box, which is a rectangular box with an open top, fixed to the side of the top opening of the drying oven away from the discharge hopper; a vibrating box, which is a box with a feed inlet at the top and a discharge outlet at the bottom, with the bottom hinged to both sides of the fixed box; a feeding conveyor belt, which is inclinedly arranged at the end of the discharge outlet of the vibrating box, with its upper end connected to the discharge outlet and its output end extending to the top of the porous material box of the transmission assembly; a connecting rod cam, including an eccentric wheel and a connecting rod, one end of which is hinged to the eccentric end of the eccentric wheel and the other end of which is hinged to the bottom of the vibrating box; a vibration drive motor, fixed to the outside of the fixed box, with its output shaft fixedly connected to the rotating shaft of the eccentric wheel through a reducer; and a shock-absorbing spring, which is a helical compression spring, fixed between the vibrating box and the fixed box, for buffering the vibration impact of the vibrating box.

[0010] As a preferred embodiment of this utility model, the hot air drying assembly includes: a centrifugal fan fixed to the top of the drying chamber away from the vibrating feeding assembly, its air inlet connected to external air via an air inlet pipe for introducing hot air into the drying chamber and forming a circulation; a heating chamber fixed at the air outlet of the fan, containing an electric heating tube and a finned heat exchanger arranged sequentially along the airflow direction, wherein the electric heating tube is used to directly heat the air, and the finned heat exchanger is used to enhance heat exchange efficiency; and a hot air duct, a rectangular stainless steel duct, one end of which is connected to the heating chamber. The air outlet is connected to the drying chamber, and the other end passes through the side wall of the drying chamber and extends into its interior. The hot air duct is equipped with a horn-shaped air outlet at one end inside the drying chamber. The return air duct is connected at one end to the bottom of the other side wall of the drying chamber and at the other end to the air inlet of the fan to form a hot air circulation. The temperature sensor adopts a dual-probe design and is installed at the top and bottom of the drying chamber respectively to monitor the drying temperature in real time. The electric air valve is set on the return air duct and is electrically connected to the temperature sensor through a wire to adjust the return air flow according to the temperature signal to control the temperature stability inside the drying chamber.

[0011] As a preferred embodiment of this utility model, the infrared drying assembly includes: infrared irradiation lamps, which are carbon fiber infrared heating tubes, spaced apart along the conveying direction of the transmission assembly. The two ends of each infrared irradiation lamp are fixedly connected to the top wall of the drying chamber through a fixed bracket, and its irradiation direction is perpendicular to the upper surface of the annular transmission belt; a reflector, which is an arc-shaped plate made of aluminum-magnesium alloy, fixed below the infrared irradiation lamps, used to reflect infrared rays to the surface of the Gastrodia elata material; and an infrared controller, fixed to the outside of the drying chamber, electrically connected to the infrared irradiation lamps through wires, used to dynamically adjust the power and irradiation time of the infrared irradiation lamps according to the moisture content of the Gastrodia elata.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. A combined drying method of "infrared radiation + hot air convection" is adopted. The far-infrared rays emitted by the infrared drying component can penetrate the surface of Gastrodia elata and directly act on the internal moisture molecules, accelerating the evaporation of internal moisture. At the same time, the hot air drying component circulates hot air into the drying chamber through hot air ducts. The hot air penetrates the material layer through the through-holes at the bottom of the material box, making full contact with the surface of Gastrodia elata and removing the evaporated moisture. The two modes work together to avoid the defect of "dry outside and wet inside" caused by hot air alone, and to make up for the problem of insufficient penetration depth when infrared is used alone. This improves the overall moisture content uniformity of Gastrodia elata by more than 40%, and shortens the drying time by 30%-50% compared with the single hot air mode. 2. The hot air drying unit is equipped with a temperature sensor and an electric air valve, which can monitor the temperature inside the drying chamber in real time and automatically adjust the return air flow according to the set value, stabilizing the temperature at 40-50℃ (the optimal tolerance range for the active ingredients of Gastrodia elata). The infrared drying unit dynamically adjusts the heating power and irradiation time according to the real-time moisture content of Gastrodia elata (which can be fed back through infrared spectroscopy or a weighing sensor), avoiding the damage of heat-sensitive components such as gastrodin and polysaccharides caused by high temperatures. Testing shows that the retention rate of gastrodin after drying is more than 25% higher than that of traditional high-temperature drying, effectively ensuring the medicinal quality of the herb. 3. The vibrating feeding component drives the vibrating box to vibrate via a cam, and with the shock-absorbing spring to buffer the impact, it can evenly disperse the Gastrodia elata into the material box of the transmission component, avoiding blockage or accumulation, and ensuring the continuity and uniformity of the feeding process; the through hole design at the bottom of the material box not only ensures the efficiency of hot air penetration, but also reduces the leakage of Gastrodia elata during the transmission process (the leakage rate is reduced by more than 90% compared with the traditional tray-type transmission), thus improving the utilization rate of raw materials. 4. The return air duct of the air drying unit forms a hot air circulation system, which can reintroduce the underutilized hot air in the drying chamber into the heating chamber, reducing the amount of external cold air required and lowering heating energy consumption. Simultaneously, the inner wall of the drying chamber is covered with an insulation layer, effectively reducing heat loss and further lowering operating costs. Actual measurements show that compared to traditional single hot air drying equipment, this device can reduce energy consumption by 20%-30%, meeting the development requirements of green processing. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a cross-sectional structural diagram of the present invention; Figure 6 This is a schematic diagram of the inner wall structure of the heating box of this utility model; In the diagram: 1. Frame; 2. Conveying assembly; 3. Drying chamber; 4. Vibrating feeding assembly; 5. Hot air drying assembly; 6. Infrared drying assembly; 7. Discharge hopper; 21. Drive shaft assembly; 22. Circular conveyor belt; 23. Material box; 24. Conveying drive motor; 31. Insulation layer; 32. Sealing cover; 41. Fixing box; 42. Vibrating box; 43. Feeding conveyor belt; 44. Connecting rod cam; 45. Vibrating drive motor; 46. Shock-absorbing spring; 51. Fan 52. Heating box; 53. Hot air duct; 54. Return air duct; 55. Temperature sensor; 56. Electric air valve; 61. Infrared irradiation lamp; 62. Reflector; 63. Infrared controller; 211. Bearing with seat; 241. Coupling; 421. Feed inlet; 422. Discharge outlet; 441. Eccentric wheel; 442. Connecting rod; 443. Rotating shaft; 511. Air inlet pipe; 521. Electric heating element; 522. Finned heat exchanger; 531. Air outlet. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] In the attached diagram, all identical reference numerals refer to the same components.

[0016] Example 1: Basic Structure Configuration like Figure 1-5 As shown, this embodiment provides a combined infrared-hot air drying machine for Gastrodia elata, belonging to the technical field of traditional Chinese medicine processing equipment. Its structure includes a frame 1, a transmission assembly 2, a drying chamber 3, a vibrating feeding assembly 4, a hot air drying assembly 5, an infrared drying assembly 6, and a discharge hopper 7.

[0017] Please see Figure 4 The frame 1 is a horizontally arranged metal frame structure, serving as the foundation for the entire machine. The transmission assembly 2 is horizontally installed inside the frame 1, including a drive shaft assembly 21, a ring conveyor belt 22, a material box 23, and a transmission drive motor 24. The drive shaft assembly 21 consists of multiple square steel pipes evenly spaced along the length of the frame 1. Each drive shaft assembly 21 is rotatably connected to the side wall of the frame 1 at both ends via bearings 211. The ring conveyor belt 22, made of rubber, is fitted around the outer circumference of two adjacent drive shaft assemblies 21. The bottom of the material box 23 is fixedly connected to the upper surface of the ring conveyor belt 22 to carry the gastrodia elata material. The transmission drive motor 24 is fixed to the outside of the frame 1, and its output shaft is connected to the end of one of the drive shaft assemblies 21 via a coupling 241, driving the ring conveyor belt 22 to circulate. The bottom material box 23 is connected to the top opening of the discharge hopper 7.

[0018] The drying oven 3 is a rectangular sealed box with an open top, fixed to the top of the frame 1. Its inner wall is covered with a heat insulation layer 31. The top opening is provided with an openable and closable sealing cover 32. The sealing cover 32 is hinged to the top of the drying oven 3 by a hinge to seal the drying environment.

[0019] Please see Figure 3 , Figure 5 The vibrating feeding assembly 4 is installed on the side of the top opening of the drying box 3 away from the discharge hopper 7, and includes a fixed box 41, a vibrating box 42, a feeding conveyor belt 43, a connecting rod cam 44, a vibration drive motor 45, and a shock-absorbing spring 46. The fixed box 41 is a rectangular box with an open top, fixed to the top of the drying box 3; the vibrating box 42 is a box with a feed inlet 421 at the top and a discharge outlet 422 at the bottom, and its bottom is hinged to both sides of the fixed box 41; the feeding conveyor belt 43 is inclinedly set at the end of the discharge outlet 422 of the vibrating box 42, with its upper end connected to the discharge outlet 422 and its output end extending to the material box 23 of the transmission component 2; the connecting rod cam 44 includes an eccentric wheel 441 and a connecting rod 442, one end of the connecting rod 442 is hinged to the eccentric end of the eccentric wheel 441, and the other end is hinged to the bottom of the vibrating box 42; the vibration drive motor 45 is fixed to the outside of the fixed box 41, and its output shaft is fixedly connected to the rotating shaft 443 of the eccentric wheel 441 through a reducer; the two ends of the shock-absorbing spring 46 are fixed between the vibrating box 42 and the fixed box 41 respectively, and are used to buffer the vibration impact, so that the vibrating box 42 pushes the gastrodia elata evenly to the feeding conveyor belt 43 through reciprocating vibration.

[0020] Please see Figure 4 , Figure 6 The hot air drying components 5 are symmetrically arranged on both sides of the drying chamber 3, including a fan 51, a heating chamber 52, a hot air duct 53, a return air duct 54, a temperature sensor 55, and an electric air valve 56. The blower 51 is a centrifugal type, fixed on the top of the drying chamber 3 away from the vibrating feed assembly 4. Its air inlet is connected to the outside air through the air inlet pipe 511. The heating box 52 is fixed at the air outlet of the blower 51. Inside, electric heating tubes 521 and finned heat exchangers 522 are arranged sequentially along the airflow direction. The electric heating tubes 521 directly heat the air, and the finned heat exchangers 522 enhance the heat exchange efficiency. The hot air duct 53 is a stainless steel rectangular pipe. One end is connected to the air outlet of the heating box 52, and the other end extends through the side wall of the drying chamber 3 into the interior. Its end is equipped with a horn-shaped air outlet 531. One end of the return air duct 54 is connected to the bottom of the other side wall of the drying chamber 3, and the other end is connected to the air inlet of the blower 51 to form a hot air circulation. The temperature sensor 55 is installed inside the drying chamber 3 to monitor the drying temperature in real time. The electric air valve 56 is set on the return air duct 54 and is electrically connected to the temperature sensor 55 through a wire. It adjusts the return air flow according to the temperature signal to stabilize the temperature inside the chamber.

[0021] Please see Figure 5The infrared drying components 6 are distributed at intervals on the upper and lower sides of the conveying components 2 along the conveying direction of the conveying components 2, including infrared irradiation lamps 61, reflectors 62, and infrared controllers 63. The infrared irradiation lamps 61 are carbon fiber infrared heating tubes, with both ends fixedly connected to the top wall of the drying chamber 3 through fixed brackets, and their irradiation direction is perpendicular to the upper surface of the annular conveyor belt 22; the reflectors 62 are aluminum-magnesium alloy arc plates, fixed below the infrared irradiation lamps 61, used to reflect infrared rays to the surface of the Gastrodia elata material; the infrared controllers 63 are fixed to the outside of the drying chamber 3, electrically connected to the infrared irradiation lamps 61 through wires, and dynamically adjust the power and irradiation time of the infrared irradiation lamps 61 according to the moisture content of the Gastrodia elata.

[0022] The discharge hopper 7 is fixed at the bottom of the drying box 3 at one end away from the vibrating feed component 4 and is connected to the end of the transmission component 2. It is used to receive and discharge the dried Gastrodia elata material.

[0023] Example 2: Reinforced Feeding Structure Configuration This embodiment has the same basic structure as Embodiment 1, with a focus on optimizing the vibration transmission efficiency of the vibrating feed assembly 4. The bottom of the vibrating box 42 is hinged to both sides of the fixed box 41 via hinge shafts. The shock-absorbing springs 46 are helical compression springs, with 3-4 sets evenly distributed along the circumference of the vibrating box 42. One end of each spring is welded to the outer wall of the vibrating box 42, and the other end is bolted to the inner wall of the fixed box 41, enhancing the vibration stability of the vibrating box 42. The surface of the feed conveyor belt 43 is provided with anti-slip textures, and a guide plate is provided at the connection between the belt and the discharge port 422 of the vibrating box 42. The inclination angle of the guide plate is consistent with the inclination angle of the feed conveyor belt 43, preventing the accumulation of Gastrodia elata material at the connection.

[0024] Example 3: Energy-saving hot air circulation configuration This embodiment enhances the hot air circulation efficiency based on Embodiment 1. A guide vane is added to the inner wall of the trumpet-shaped air outlet 531 of the hot air duct 53 to evenly distribute the hot air into the drying chamber 3; a filter screen is installed at the end of the return air duct 54 near the side wall of the drying chamber 3 to intercept Gastrodia elata fragments and prevent them from entering the fan 51; the temperature sensor 55 adopts a dual-probe design, with one probe located at the top and one at the bottom of the drying chamber 3. The infrared controller 63 simultaneously receives the two temperature signals and comprehensively adjusts the opening of the electric air valve 56 to further improve temperature control accuracy.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A combined infrared hot air drying machine for Gastrodia elata, characterized in that, The assembly includes a frame (1), a transmission component (2), a drying chamber (3), a vibrating feed component (4), a hot air drying component (5), an infrared drying component (6), and a discharge hopper (7). The frame (1) is a metal frame structure, horizontally arranged. The transmission component (2) is horizontally arranged above the inside of the frame (1) and is used to carry and transport Gastrodia elata material. The drying chamber (3) is a rectangular sealed box with an open top, fixed to the top of the frame (1), and its interior is arranged corresponding to the conveying path of the transmission component (2). The vibrating feed component (4) is installed in the drying chamber. 3) The top opening is used to uniformly convey the gastrodia elata to be dried to the transmission component (2); the hot air drying component (5) is symmetrically arranged on both sides of the drying box (3) to introduce hot air into the drying box (3); the infrared drying component (6) is distributed at intervals on the upper and lower sides of the transmission component (2) along the conveying direction of the transmission component (2) to perform infrared radiation drying on the gastrodia elata; the discharge hopper (7) is fixed at the bottom of the drying box (3) away from the vibrating feeding component (4) and connected to the end of the transmission component (2) to discharge the dried gastrodia elata.

2. The combined infrared hot air drying machine for Gastrodia elata according to claim 1, characterized in that, The transmission assembly (2) includes: a drive shaft assembly (21), which consists of multiple square steel pipes, evenly distributed along the length of the frame (1) at the bottom of the inner side of the frame (1), with both ends of each drive shaft assembly (21) rotatably connected to the side wall of the frame (1) via a bearing seat (211); an annular transmission belt (22), which is fitted around the outer periphery of two adjacent drive shaft assemblies (21) and is made of rubber; a material box (23), whose bottom is fixedly connected to the upper surface of the annular transmission belt (22), and the surface of the material box (23) is evenly distributed with through holes of 3-8 mm in diameter; a transmission drive motor (24), which is fixed to the outside of the frame (1), and whose output shaft is connected to the end of one of the drive shaft assemblies (21) via a coupling (241); and the bottommost material box (23) is connected to the top opening of the discharge hopper (7).

3. The combined infrared hot air drying machine for Gastrodia elata according to claim 1, characterized in that, The inner wall of the drying box (3) is covered with a heat insulation layer (31), which is made of rock wool board with a thickness of 50-100mm; the top opening of the drying box (3) is provided with an openable sealing cover (32), which is hinged to the top of the drying box (3) by a hinge.

4. The combined infrared hot air drying machine for Gastrodia elata according to claim 2, characterized in that, The vibrating feeding assembly (4) includes: a fixed box (41), which is a rectangular box with an open top, fixed to the side of the top opening of the drying oven (3) away from the discharge hopper (7); a vibrating box (42), which is a box with a feed inlet (421) at the top and a discharge outlet (422) at the bottom, and the bottom is hinged to both sides of the fixed box (41); and a feeding conveyor belt (43), which is inclinedly arranged at the end of the discharge outlet (422) of the vibrating box (42), with its upper end connected to the discharge outlet (422), and its output end extending above the material box (23) of the transmission assembly (2). The connecting cam (44) includes an eccentric wheel (441) and a connecting rod (442). One end of the connecting rod (442) is hinged to the eccentric end of the eccentric wheel (441), and the other end is hinged to the bottom of the vibration box (42). The vibration drive motor (45) is fixed on the outside of the fixed box (41), and its output shaft is fixedly connected to the rotating shaft (443) of the eccentric wheel (441) through a reducer. The shock absorber spring (46) is a helical compression spring, fixed between the vibration box (42) and the fixed box (41), and is used to buffer the vibration impact of the vibration box (42).

5. The combined infrared hot air drying machine for Gastrodia elata according to claim 1, characterized in that, The hot air drying assembly (5) includes: a fan (51), which is a centrifugal structure and is fixed on the top of the drying box (3) away from the vibrating feeding assembly (4), and its air inlet is connected to the outside air through an air inlet pipe (511); a heating box (52), which is fixed at the air outlet of the fan (51), and has an electric heating tube (521) and a finned heat exchanger (522) arranged sequentially along the airflow direction inside. The electric heating tube (521) is used to directly heat the air, and the finned heat exchanger (522) is used to enhance the heat exchange efficiency; and a hot air duct (53), which is a rectangular duct made of stainless steel, with one end connected to the air outlet of the heating box (52) and the other end passing through the drying box. (3) The side wall extends into its interior. The hot air duct (53) is located inside the drying box (3) with a horn-shaped air outlet (531) at one end. The return air duct (54) is connected to the bottom of the other side wall of the drying box (3) at one end and to the air inlet of the fan (51) at the other end to form a hot air circulation. The temperature sensor (55) adopts a dual-probe design and is installed on the upper and lower parts of the drying box (3) respectively to monitor the drying temperature in real time. The electric air valve (56) is set on the return air duct (54) and is electrically connected to the temperature sensor (55) through a wire to adjust the return air flow according to the temperature signal to control the temperature stability inside the drying box (3).

6. The combined infrared hot air drying machine for Gastrodia elata according to claim 1, characterized in that, The infrared drying assembly (6) includes: infrared irradiation lamps (61), which are carbon fiber infrared heating tubes, and are spaced apart along the conveying direction of the transmission assembly (2). The two ends of each infrared irradiation lamp (61) are fixedly connected to the top wall of the drying box (3) through a fixed bracket, and its irradiation direction is perpendicular to the upper surface of the annular transmission belt (22); a reflector plate (62), which is an arc-shaped plate made of aluminum-magnesium alloy, is fixed below the infrared irradiation lamps (61) and is used to reflect infrared rays to the surface of the Gastrodia elata material; and an infrared controller (63), which is fixed on the outside of the drying box (3) and is electrically connected to the infrared irradiation lamps (61) through wires, and is used to dynamically adjust the power and irradiation time of the infrared irradiation lamps (61) according to the moisture content of the Gastrodia elata.

Images